The practice of incineration treatment pool?

Currently, domestic and foreign municipal waste disposal methods used in the main sanitary landfill, high-temperature composting and incineration and other three treatment methods. Sanitary landfill, high-temperature composting due to the large footprint, secondary environmental pollution, the use of its proportion is becoming less and less. However, incineration treatment with harmlessness, resourcefulness and minimization as the ultimate treatment goal is getting more and more high-speed development, which makes the incineration technology of municipal domestic waste widely used. The technical characteristics of incineration treatment are: significant reduction effect, high degree of harmlessness; incineration treatment facilities cover a small area, no secondary pollution of the surrounding environment; in the garbage calorific value is high, the treatment reaches a certain scale, but also can use the rest of the heat to generate electricity or heat supply. Incineration treatment method can be the fastest, maximum realization of the harmlessness of solid waste, stabilization, reduction, large-scale treatment system is also equipped with thermal energy recovery and utilization of devices, so that the waste into treasure, waste use of recycled energy, into the mainstream of environmental protection of waste disposal. Incineration technology is moving towards the direction of high efficiency, energy saving, low cost and low pollution. Therefore, economically developed cities with high calorific value of garbage, so it is the best choice and investment to adopt advanced incineration technology for the treatment of municipal garbage. Waste incineration treatment process technology and equipment has become increasingly mature. China's mainstream garbage treatment incinerator type including: Basic1 pulse throwing type garbage incinerator, Martin furnace reciprocating mechanical grate furnace, LXRF series of vertical rotary kiln incinerator, fluidized bed incinerator and so on. And other supporting power or heat production technology and equipment such as: waste heat boilers, steam engines, flue gas desulphurization, water treatment systems, electrical, automatic control, etc. are basically similar, and has been very mature. In this analysis of China's domestic common several kinds of waste incinerator. 2, several commonly used incinerator model 2, 1Basic1 pulse throwing waste incinerator Basic1 pulse throwing waste incinerator is invented by the U.S. John.NBasicSr, specifically for the incineration of solid waste treatment of patented technology. Handle a wide range of garbage. Can deal with industrial waste, domestic waste, medical waste, waste rubber tires, etc., and garbage into the furnace before incineration does not require any pretreatment. 2) Pulse throwing grate technology incinerator, there is a self-cleaning function. The air channel on the grate is designed to be downward sloping, so that the air blown into the grate can blow the grate on the one hand, and prevent the garbage from blocking the air channel on the other hand. In addition, the suspension mechanism and power unit of the grate are all set outside the furnace chamber, which is convenient for maintenance. 3) The grate structure is novel. Each grate of the furnace is a whole grate, adopting suspended stepped structure, the movement track of the garbage is always in the groove, with less contact with the surrounding water-cooled wall.4) High combustion thermal efficiency. Normal combustion thermal efficiency of more than 80%, in addition to the incinerator ignition and occasional continuous rain caused by excessive water in the garbage (more than 60%), in order to keep the temperature of the second combustion chamber at more than 8500C, need to spray a small amount of fuel oil to help combustion, under normal circumstances, even if it is a great deal of water in the incineration of domestic garbage (50% or less), there is no need to add auxiliary fuels, such as coal or heavy fuel oil. 5) low operating and maintenance costs. As a result of the use of many special designs (such as the whole grate), there is no large and complex mechanical drive system, the entire drive system are designed outside the furnace, the drive components are not exposed to high temperatures in the furnace, so the incinerator's accident rate and the amount of maintenance is very low, saving maintenance costs. As well as a higher level of automation control, so the operation and maintenance personnel less, less maintenance workload. 6) High reliability. Domestic equipment, operation in recent years shows that the incinerator failure rate is low. 7) High level of emission control. Strictly control the combustion process of flue gas in the secondary and tertiary re-combustion flue, strictly control the combustion temperature, air ratio and residence time to reduce the generation of hydrocarbons, carbon monoxide and nitrogen oxides and other harmful gases. After testing, the CO content of the flue gas emission is 1-10PPM, HC content is 2-3PPM, and NOx content is 35PPM, which is lower than the flue gas emission standards of the United States and Europe. Especially, the system ensures that the flue gas stays no less than 2 seconds in the combustion system (at a temperature of 850℃ or above) to minimize the emission of dioxin and fully meet the emission standards of Europe and the United States. 2 Reach the emission standards of Europe and the United States. 2, 1, 2 working principle of the garbage through the automatic feeding unit into the incinerator drying bed drying, and then sent to the first stage of the grate, in the grate by the high temperature volatilization, cracking, the grate in the pulse of the air-powered device under the impetus of the throw, the garbage thrown step by step into the next level of the grate, when polymer materials for cracking, and other substances for combustion. At this time, the polymers will be cracked and other substances will be burned. This will continue until it finally burns out and enters the ash pit, which will be discharged by the automatic slag removing device. The combustion air is injected into the grate by the air holes on the grate and mixes with the garbage to burn, and at the same time makes the garbage suspended in the air. The volatilized and cracked out material enters the second-stage combustion chamber for further cracking and combustion, and the unburned out flue gas enters the third-stage combustion chamber for complete combustion; the high-temperature flue gas passes through the heated surface of the boiler to heat up the steam, and at the same time, the flue gas is cooled down and then discharged.2,1,3 Incineration MechanismThe garbage does not need to be pretreated in any way before being put into the furnace for incineration. Domestic garbage waste by automatic or manually controlled feeder into the incinerator drying grate rack drying, pyrolysis, in the drying grate, after receiving the radiant heat in the main chamber, evaporate the water in the garbage, so that the solid waste is more easily burned. This stage (drying pyrolysis gasification section) to control the amount of combustion air, oxygen supply is insufficient. At the same time part of the garbage in the high temperature radiation, began to chemical decomposition, which part of the polymer hydrocarbons and carbon monoxide and other combustibles volatilized, drying grate at the temperature control in the 500 ℃ ~ 600 ℃ or so, so that there is the best thermal decomposition temperature, you can achieve the best decomposition effect, due to the induced draft fan effect, this part of the gas in the main chamber of the residence time is very short, only 1 ~ 2 seconds Because the oxygen supply is not sufficient, only 25% of the hydrocarbons are ignited in the main hearth, 15% of the fixed carbon is ignited in the grate, and the remaining 60% or so of the volatile hydrocarbons go into the recombustion chamber. After drying, it enters the first stage grate, where the volatiles and combustibles produced by pyrolysis on the hearth are burned at high temperatures. The remaining solids of the garbage combustion are left on the grate, and through intense mixing with the air and the throwing of the grate, the garbage is thrown into the next level of the grate to continue combustion. ***There are six levels of pulse incineration grate. So on and so forth, Daos furnace combustion principle schematic until the last grate combustion, the amount of air into the waste completely burned out, into the ash pit, discharged by the automatic deslagging device. At this point on the entire incinerator chamber and re-combustion chamber interface state, air, fuel particles, volatile matter slightly incomplete combustion state due to the intensity of combustion at all levels of grate combustion and combustion of waste is not the same as the amount of air required is different, so the vibration frequency and swing amplitude of each layer of the grate is also not the same, completely computer-controlled, high accuracy. According to the different combustion characteristics and heat transfer methods, it can be divided into three stages: the first stage is arranged with membrane water-cooled wall tubes in the furnace chamber to receive the radiant heat energy of fuel combustion. The combustion air is fed by the lower fan of each grate, and enters the hearth through the nozzle, and the waste is kept loose and floating combustion under the action of the airflow, so this incinerator has the characteristics of both grate furnace and a small amount of fluidized bed. Flue gas after combustion of the hearth has many coke particles and unburned material, at this time the temperature reaches 860 ℃; the second stage is with the flue gas into the first stage of re-combustion flue and quantitative high-speed injection of air vigorously mixed combustion, there are still unburned embers continue to enter the second stage of re-combustion flue and excess air vigorously mixed with the continuation of the combustion, the temperature of up to 1,000 ℃, there is no heat exchange in the process, the main purpose of the flue gas is to improve the temperature Accelerate the decomposition of harmful substances in the flue gas; the third stage for the control of the waste heat boiler inlet temperature, extracted from the coal economizer outlet part of the 190 ℃ flue gas back to the waste heat boiler before the mixing, so that the temperature of the flue gas into the waste heat boiler to maintain the temperature of the flue gas in the 760 ℃, combustion of the high temperature flue gas completely through the superheater, the coal economizer, the air preheater convective heat transfer, and then by the absorption of dry lime and activated carbon, and then through a semi-dry Flue gas treatment equipment and cloth bag vacuum cleaner through the induced draft fan pumped out by the flue gas tube discharged to the atmosphere, the lower part of the absorption tower fly ash and lime and other mixtures discharged by the ash discharge device.2, 2 Martin furnace type mechanical grate furnace 2, 2, 1 Martin furnace type garbage incinerator main features of the grate material requirements and processing precision requirements, requiring the grate and the grate contact surface between the grates is quite smooth, the gap between the rows and rows is quite small.1) processing There is a wide range of garbage. However, partitioned stacking, fermentation and mixing of the waste in the waste storage pit can make the components of the waste uniform; 2) The hearth of the grate furnace consists of a large number of furnace bars. Martin stove bar with high chromium heat-resistant, wear-resistant cast iron manufacturing, material performance is more excellent, the structure is also unique, the stove bar of the fascia made into a closed primary wind channel, the use of high-speed flow of the primary wind will be taken away from the heat of the stove bar, play the role of the cooling fins, effectively reduce the working temperature of the stove bar, thereby extending the service life of the stove bar; 3) the operation to achieve all the mechanized, automated; 4) a very good Incineration treatment effect; 5) produce less flue gas, tail gas is easy to deal with, dioxin emissions can meet the environmental standards. 2, 2, 2 working principle of the garbage through the feed hopper into the grate tilted downward (grate is divided into drying area, combustion area, burned out area), due to the staggered movement between the grates, the garbage will be pushed downward, so that the garbage in turn through the various areas on the grate (garbage from one area to another when entering the area,) (When the garbage enters from one zone to another, it plays a big role of turning over), until it is burned out and discharged from the furnace. The combustion air enters from the lower part of the grate and mixes with the garbage; the high temperature flue gas passes through the heating surface of the boiler to produce hot steam, and at the same time the flue gas is also cooled, and finally the flue gas is treated by the flue gas treatment device and discharged.2,2,3 Incineration mechanismThe garbage is transported by garbage trucks and unloaded into the garbage pond, the garbage cranes will turn the unloaded garbage into mixing and blending, and the garbage is piled up in different zones according to the operation procedures of the garbage pit, and then it is fermented and turned over and mixed to make the garbage components uniform. Mixing can make the components of the garbage uniform, to avoid the garbage into the furnace calorific value of high and low, resulting in excessive fluctuations in furnace temperature; stack fermentation is an important experience to solve the problem of high moisture, low calorific value of garbage incineration, the mechanism is to precipitate part of the water and produce methane gas, both to improve the calorific value of the garbage into the furnace, but also to make the garbage easy to catch on fire combustion. After about two to three days of stack fermentation of the garbage by the crane to grab and throw into the garbage hopper. The hopper and the material tank of the joint with the material door, for ignition furnace and flameout furnace operation process, no garbage in the tank, close the material door can make the furnace chamber and the outside world to isolate, maintain the negative pressure in the furnace. According to the heating curve to put garbage, material door open, garbage along the material trough down to the feeding platform and full of the entire trough, feeding device will push the garbage down the grate, garbage in the grate turn over process by the burner and the furnace heat radiation and primary wind blowing baking, rapid evaporation of water, fire combustion, the furnace temperature rises gradually when the furnace temperature reaches 600 ° C, the burner exit, garbage incineration into the normal state, the furnace temperature continues to rise and maintain the normal state. Furnace temperature continues to rise and maintained at about 850 ℃. Garbage in the grate in turn through the drying, combustion and combustion of the three regions, garbage in the combustible components of the complete combustion, non-combustible ash by the slag roller to send out of the slag machine fell into the slag machine, the slag machine to store water and maintain a certain water level to play a role in water sealing, to ensure that the furnace stability of the negative pressure, the ash in the slag machine after the quenching of the fire and cooling is pushed out by the vibration of the conveyor belt to send to the ash pit in the ash thrower role fell into the ash pit, garbage incineration into the normal state, garbage continues to rise and maintained about 850 degrees Celsius. In the ash storage pit, the garbage becomes stable and harmless ash after incineration. Vibrating conveyor belt also has a role is to make the metal in the ash exposed, easy to hang in the vibrating conveyor belt above the iron remover will suck it out, pooled and packaged for reuse. Garbage incineration process, some fine ash from the gap between the furnace bars fall into the wind chamber, these ashes are called 'ash leakage', timed by the leakage of ash discharge system to open the valve under the wind chamber in turn, the leakage of ash in the wind chamber under the action of the wind pressure falls into the ash tank, ash tank end through the slag machine, the other end with the damper and the public **** wind chamber connected to the leakage of ash discharge The system will open the air door instantly according to the program, and the leaking ash will be blown into the slag machine, and finally be discharged together with the ash. Above the ash storage pit is equipped with a bridge-type grab crane, which grabs the ash gathered in the ash storage pit with a grab and loads it into trucks for transportation and landfill. The air for combustion is taken from the top of the garbage storage pit (the garbage pool is sealed), which is pumped and pressed by the blower for two-stage heating, the first stage is steam heater, the second stage is flue gas heater, and the air temperature is increased to about 250℃, and then it is divided into the primary air and the secondary air, and the primary air enters into the public **** air chamber under the grate, and through the regulation of the air doors of each air chamber, it can get the optimal distribution of the air volume, and finally, the air ducts through the furnace bars enter into the chamber through the garbage layer. The primary air enters into the public **** air chamber below the grate, through the adjustment of the air door of each air chamber, to get the best air volume distribution, and finally through the air duct of the furnace bar to enter the furnace chamber through the garbage layer, to provide the oxygen needed for garbage incineration; the secondary air is injected into the furnace chamber through the secondary air duct through the adjustment of the air door from the two rows of nozzles at the front and back arches of the combustion chamber above, to perturb the combustion gas and supplement the amount of oxygen, to achieve the purpose of full combustion. The combustion air is extracted from the garbage storage pit in order to send the polluted air with bad odor into the furnace for high temperature treatment, and maintain the negative pressure of the garbage storage pit to avoid its escape and cause pollution of the surrounding environment. Waste combustion of high-temperature flue gas in the induced draft fan suction first through the boiler first channel, the first channel water-cooled wall with refractory materials in the lower part of the laying of a considerable length of the guard burning belt to slow down the speed of the heat exchange, so that the flue gas temperature in this area to maintain a temperature of not less than 850 ° C, is conducive to the decomposition of dioxin to the maximum extent possible. The laying of the guard burning belt can also avoid the water-cooled wall exposed to high temperatures in the flue gas and high-temperature corrosion. Flue gas through the slag condensate tube from the top down through the second channel, the use of radiation heat transfer for heat exchange, and then turn sharply into the third channel full of convection heating surface and the fourth channel, accelerating the speed of heat exchange, in the boiler at the exit of the flue gas temperature down to about 380 ℃. Subsequently, it passes through the fifth channel which is arranged with tube-type flue gas warmer, and carries out the final heat exchange with air, and is cooled down to about 270℃. In order to ensure that the flue gas temperature at the inlet of the ESP is stabilized at the set temperature value, the fourth channel of the boiler is equipped with a bypass flue and an adjusting baffle plate to control the flue gas temperature at the inlet of the ESP by adjusting the flue gas volume flowing through the fourth channel. After completing the heat exchange, the flue gas enters the flue gas treatment system.2, 3LXRF Vertical Rotary Kiln IncineratorLXRF Series Vertical Rotary Pyrolysis Incinerator is developed and manufactured by Shenzhen Han's Solid Waste Equipment Co., Ltd. and Tsinghua University's Department of Environmental Science and Engineering***, and it is the key equipment in the process of garbage incineration. The development project for the Shenzhen high-tech projects, and has declared the national 863 program. The Ministry of Construction's "construction industry waste disposal technology development" Tenth Five-Year "plan and 2010 planning outline" will be included in the research and development of this technology in the 2006-2010 science and technology development goals, the incinerator adopts the world's most advanced pyrolysis gasification incineration technology, in the design of the incinerator main body adopts unique Patented technology.2,3,1LXRF series vertical rotary pyrolysis incinerator features: high equipment utilization, low carbon content in ash, low excess air, low harmful gas emissions, low calorific value of the garbage combustion difficulties.1) advanced combustion mechanism; 2) equipment manufacturing, low operating costs; 3) strong adaptability to domestic garbage. Suitable for China's cities and towns with low calorific value, high moisture, not sorted domestic garbage; especially suitable for medical waste and other special garbage; part of the industrial waste; 4) the garbage does not need pretreatment, the operation of the realization of the full automation; 5) incineration treatment effect is good; 6) the amount of flue gas produced is small, the exhaust gas is easy to deal with, the emission of dioxin is almost zero. 2, 3, 2 principle of operation of rotary incinerator is to use the cooling water pipe or refractory material Arranged along the furnace body, the furnace body is placed horizontally and slightly inclined. Through the non-stop operation of the furnace body, the garbage in the furnace body is fully combusted while moving in the direction of the tilted furnace body until it is burned out and discharged from the furnace body.2,3,3 Incineration MechanismThe furnace is divided into pyrolysis gasifier and two combustion chambers in terms of structure. Combustion level distribution in the pyrolysis gasifier, from top to bottom sequentially divided into drying section, pyrolysis section, combustion section, combustion section and cooling section. Into the pyrolysis gasifier garbage first in the drying section by the pyrolysis section of the rising flue gas drying, which the water volatilization; in the pyrolysis gasification section decomposition for carbon monoxide, gaseous hydrocarbons and other combustibles and the formation of mixed flue gas, mixed flue gas is sucked into the second combustion chamber combustion; pyrolysis gasification after the residue (liquid tar, the purer carbon, as well as the garbage itself contains inorganic ash and inert materials, etc.) into the combustion section of the combustion section fully combustible, the temperature up to 1100-1300 degrees Celsius, the temperature of which can reach up to 1100-1300 degrees Celsius. The temperature is as high as 1100-1300℃, and its heat is used to provide the energy needed for the pyrolysis section and drying section. The residue generated in the combustion section continues to burn through the combustion section and then enters the cooling section, where it is cooled by the primary air at the bottom of the pyrolysis gasifier (while the residue preheats the primary air), and then discharged out of the slag system after being mechanically squeezed and crushed by the grate. The primary air passes through the residue layer to provide sufficient combustion oxygen to the combustion section. The air consumes a large amount of oxygen in the combustion section and then travels upstream to the pyrolysis section and creates the under-oxygenated or anoxic conditions under which the pyrolysis gasification reaction occurs. It can be seen that the waste is pyrolyzed in the pyrolysis gasifier to achieve a two-stage distribution of energy: the cracked components go into the second combustion chamber to be incinerated, and the cracked residue stays in the pyrolysis gasifier to be incinerated, and the thermal decomposition, gasification and combustion of the waste have formed a dynamic equilibrium of the downward movement direction. When the feeding and slag discharge system runs continuously and stably, the physicochemical process of each reflective section in the furnace also runs continuously and stably, which ensures the continuous and normal operation of the pyrolysis gasifier.2,4 Fluidized bed incinerator2,4,1 Characteristics: Fluidized bed combustion is sufficient, the combustion control of the furnace is better, but there is a large amount of dust in the flue gas, the operation is complicated, the operation costs are high, the requirement of uniformity of the fuel particle size is high, and the need for crushing devices, the Quartz sand has wear and tear on the equipment, and the equipment needs regular maintenance.1) Utilizing the isogravimetric ratio of garbage and coal, and adopting a special wind distribution method, the garbage is circulated and burned in the furnace, so that the garbage can be thoroughly cleaned and treated; 2) By arranging a two-stage separator for the separation of the material and return, the combustion can be well controlled, and the combustion efficiency can be improved to over 99%; 3) Adopting the medium-low temperature combustion (the furnace outlet flue gas temperature of 850℃) and the staged air-feeding staged combustion. The method of staged air supply and staged combustion can effectively inhibit and reduce the emission of SO2 and NOx; 4) For the municipal garbage with high sulfur and chlorine content, the method of adding limestone in the furnace and washing at the end is adopted to reduce the emission of SO2 and HCl; 5) Garbage and sewage are sent by sewage pumps to the furnace for high-temperature treatment, and the odor of the garbage in the garbage storage silo is pumped by the secondary fan to the incinerator as the fueling air for garbage incineration, which maintains groundwater and the surrounding atmosphere. air to keep the groundwater and the surrounding atmosphere clean; 6) A unique ash sorting and cooling device is used to sort out and return suitable fluidized bed material to the fluidized bed while cooling the ash.2,4,2 Working principleThe furnace body is composed of a porous distribution plate, and a large amount of quartz sand is added to the furnace chamber, which is heated to more than 600°C, and hot air of more than 200°C is drummed into the bottom of the furnace, so that the hot sand boils up. The hot sand is boiled up and then put into the garbage. The garbage boils together with the hot sand, and the garbage is quickly dried, caught on fire and burned. Unburned garbage specific gravity is light, continue to boil and burn, burned garbage specific gravity is large, fall to the bottom of the furnace, after water-cooled, with sorting equipment will be coarse slag, fine slag sent to the outside of the plant, a small amount of medium slag and quartz sand through the lifting equipment back to the furnace to continue to use. 2,4,3 incineration mechanism boiler adopts a heterogeneous fluidized bed combustion and low times the rate of grading and separation of circulating re-feeding of the combustion system, which consists of the furnace chamber, The system consists of three parts: furnace, material separation collector and reclaimer. The upper part of the furnace chamber consists of membrane water-cooled wall, and the lower part is an inverted cone fluidized combustion chamber, which is also called dense phase area. The bottom of the water-cooled air cloth plate, the air cloth plate is arranged with a special form of air cap. The water-cooled tubes under the air cloth plate form an isobaric air chamber. Primary air enters the dense phase zone through the isobaric air chamber and the air cap of the air cloth plate to start the combustion of fuel and blow the material away from the air cloth plate. The secondary air is sent to the furnace by the secondary air outlet above the bed, and the ratio of primary and secondary air is about 7:3, which can be adjusted according to the change of fuel and the operation situation, so that it can not only achieve the purpose of complete combustion, but also control the generation of SO2 and NOx. In addition, from the primary air led to several ducts from the front and rear walls into the dense phase area, respectively, toggle the garbage, coal and return material ash, so that the garbage, coal and return material ash and other materials uniformly sown to the bed material, while strengthening the lower part of the dense phase area of the perturbation. Dense-phase area of the upper part of the suspension section, in order to ensure that the flue gas residence time in the furnace chamber is greater than 2 seconds, the furnace chamber section has been expanded. The flue gas carries the material to continue combustion, and at the same time to the hearth around the heat release. Due to the expansion of the cross-section, and the flue gas through the suspension section of the collision of the top of the anti-wear layer, part of the coarse material to return to the dense phase area, the flue gas only carries the fine material out of the furnace into the first stage of the separator. The primary separator is a four-row impingement separator, composed of slag tube, arranged at the exit of the furnace, as a separation device in the furnace. When the flue gas passes through the primary impact separator, the coarser part of the material is separated out and falls into the collection hopper below the separator, and then returns to the hearth for recirculation and re-combustion. The flue gas after primary separation carries the finer materials, and then passes through the superheater and enters the secondary separator - the lower exhaust worm shell cyclone separator, which further separates and collects the finer materials, and then returns to the dense phase area through the U-type reclaimer to continue the cycle of combustion. The superheater is pure convection type, divided into two stages, in order to prevent high-temperature corrosion, arranged in the furnace outlet, behind the slag condensate tube. In order to ensure that the tube wall temperature does not exceed the temperature, along the flue gas flow direction in turn for the low-temperature superheater and high-temperature superheater. Between the two levels of superheater with a surface-type desuperheater to regulate the steam temperature, taking into account the incineration of garbage flue gas amount of larger characteristics, surface-type desuperheater temperature adjustment range between 0-40 ℃. In order to prevent wear and tear of the superheater tubes, in addition to the superheater is arranged in the first level after the inertia separator, the first two rows of tubes of the superheater are sprayed with nickel-based alloy anti-wear technology. The boiler adopts two snail shell steel plate type medium temperature cyclone separators, with steel plate structure on the outside and thermal insulation, adiabatic and anti-friction materials laid on the inside. The population of the separator is arranged in the form of a worm shell, which ensures that the separation efficiency reaches 99.3%. The return valve adopts a non-mechanical "U" valve return, which ensures that the return channel is smooth and resistant to high temperature, abrasion and bonding. The air preheater is of vertical tube type, arranged in two levels. The air preheater tube is a spiral groove tube of ?51×1.5, with an anti-wear casing at the inlet. To prevent low-temperature corrosion, the lower stage of the air preheater adopts corrosion-resistant Cowden tubes. The feeding system is divided into two systems for trash and coal, both of which are arranged in front of the furnace. The garbage feeding system is a chain wheel type feeding device, the garbage is transported to the population of the furnace chamber through the chain wheel, and evenly scattered on the bed under the blowing of the broadcast garbage wind. The coal feeding system consists of two positive-pressure screw feeders, each of which feeds more coal than the full load. The slag produced after combustion of the boiler is connected to the cold slag sorting device through the slag outlet at the back side of the air cloth plate, and the slag is continuously discharged after cooling. When the cold slag sorting device fails, the emergency slag discharge pipe can be used to manually discharging slag intermittently, and the amount of slag discharged to maintain the appropriate material layer shall prevail. Cyclone separator separated from the ash, all or part of the return to the furnace as a means of regulating the bed material temperature, furnace outlet flue gas temperature and reduce the concentration of dust discharged from the boiler outlet. During normal operation of the boiler, bed material can be added through the furnace sand port to maintain the height of the material layer. At the same time to supplement part of the auxiliary fuel - raw coal, in order to ensure the normal heat supply and power generation of the thermal power plant. The waste incinerator of Yuhang Thermal Power Plant has been operating so far and is in good condition. Its operation: garbage incinerator, stable operation, the technical parameters and indicators have reached the design requirements to ensure the normal operation of the generating unit; the longest continuous operation time of more than one month; the average hourly incineration of about 7 tons of garbage, the largest number of up to 11 tons / hour; composition of the garbage, the calorific value of seasonal variations and adaptability is good.