Multi-stage grate is composed of reciprocating parts. The garbage is pushed to the inclined grate by the feeding equipment and heated at high temperature in the furnace, so that some garbage is drilled. In addition, the movement of the grate not only pushes the garbage forward, but also loosens the garbage layer, which can go through many stages such as drilling, fuel and post-combustion, so as to achieve complete incineration.
2. Industrial waste incinerator
The evaporation of rolling grate is simply blocked, the maintenance workload is heavy, and it is likely to be caught by large items. The movable grate occupies a large area, the air duct system is messy, the high-moisture and low-value garbage is not completely burned, and it is difficult to catch fire, so it is rarely used. The fan-shaped converter row is still in the stage of continuous improvement because of its poor control and high furnace temperature.
3. Converter
The reverse converter incineration system originated from the design of reverse calcining kiln for refractory brick fabrics, and has been widely used in cement industry. The garbage is fed from the front end above the skewed and slowly rotating rotary kiln, and the traveling speed of the garbage is controlled by the rotating speed, so that the garbage can complete the processes of drilling, incineration and ash cooling in the forward conveying of the reverse kiln, and the cooled ash is discharged from the bottom end of the kiln. The whole furnace body of rotary kiln can be welded into a barrel shape by cooling water pipes and perforated steel plates, or it can be made by adding refractory lining in the steel barrel. The furnace body inclines downwards and is divided into three sections: boring and post-firing, and the front and rear ends are supported by additional wheels. The outer wheel is supported by four rollers, and the sprocket drive device rolls the wheels to rotate the furnace body. Due to the rotation, the garbage is stirred and transported forward on the furnace body, and the preheated air enters the kiln through the perforated steel plate from the bottom, so that the garbage is completely burned.
Rotary kiln has wide incineration adaptability and can burn wastes with different functions. This kind of furnace has fewer mechanical parts and fewer faults, and can run continuously for a long time. However, the thermal efficiency of rotary kiln is low, the cost is higher if auxiliary fuel is needed, and the exhaust gas temperature is low and there is a stench. Therefore, deodorization equipment or high-temperature combustion chamber is needed for incineration. Because the kiln is long and covers a large area, it has strict requirements on the structure of the grate of the rear combustion chamber, and its cost is high and the quotation is expensive.
4. Fluidized furnace
Fluidized bed furnace incineration technology is a new clean incineration technology developed rapidly in the early 1960s. The incinerator of this technology is based on setting a Wimbledon-resistant plate at the lower part of the furnace, which is filled with inert particles carrying heat. After air is distributed under the bed, inert particles exult to form a fluidized bed section, and there is a sufficiently high burnout section above the fluidized bed section.
Generally, after the materials enter the fluidized bed, the heat and mass transfer rate between particles and gas is high, and the materials are almost completely mixed in the bed, so the wastes thrown into the bed can be agile and uniform. Because the heat carrier stores a lot of heat, it can prevent the furnace temperature from changing sharply during feeding, keep the bed temperature uniform and prevent local overheating, so the bed temperature is easy to control. Taken together, it has the advantages of high fuel efficiency, wide load regulation range, low pollutant emission, high thermal intensity and suitability for burning low calorific value fuel.