Secondly, there is a leachate collection pool and a delivery pump outside the bottom of the garbage storage pit. The filtered leachate enters the leachate collection pool for temporary storage, part of it is reused in the dustbin for spraying and dust removal, and the rest is discharged into the municipal sewage pipe network after pretreatment, and transported to the municipal sewage treatment plant for centralized treatment (if there is no municipal sewage treatment plant, it needs to be further treated in the garbage incineration plant and discharged after reaching the standard).
refuse incinerator
Thirdly, when the garbage is incinerated, the garbage is sent out by the furnace pusher and passes through the drying section, the burning section and the burnout section in turn. In order to fully decompose dioxin (a colorless, odorless and highly toxic fat-soluble substance, which can damage various organs and systems and belongs to the first-class carcinogen) produced by garbage incineration, the residence time of incineration flue gas in the temperature area above 850℃ is more than 2 seconds; In order to reduce the emission concentration of nitrogen oxides in incineration flue gas, SNCR system is installed above the furnace, and ammonia reductant is injected into the furnace to react with nitrogen oxides, thus removing nitrogen oxides. The air required for burning garbage in the furnace is divided into primary air and secondary air. The primary air is directly extracted from the garbage storage pit by the primary fan to keep the negative pressure state of the garbage storage pit and the unloading hall. After preheating, the primary air is introduced into the incinerator to support combustion, and at the same time, the malodorous gas carried in the primary air is combusted and decomposed, and the secondary air is introduced from the upper part of the furnace to support combustion.
Fourth, waste heat reuse. The high-temperature flue gas generated by garbage incineration circulates into the waste heat boiler, generates hot steam through heat exchange, and sends it to the steam turbine for power generation.
refuse incinerator
Fifthly, flue gas treatment, namely spraying reducing agent ammonia water into the garbage incinerator to control the concentration of nitrogen oxides generated in the flue gas in the incinerator; The flue gas discharged from the waste heat boiler enters tangentially from the top of the semi-dry deacidification reaction tower, and the alkaline absorbent is sprayed out from the rotary atomizer at high speed in the form of mist droplets, so that most acid gases (such as hydrogen chloride and sulfur dioxide) in the flue gas are absorbed and removed by the alkaline solution, the residual heat of the flue gas evaporates the water in the slurry, and the reaction product is discharged in the form of dry solid; The flue gas from the reaction tower enters the subsequent flue, which is equipped with an activated carbon injection system, and dioxin and heavy metals in the flue gas can be adsorbed by injecting activated carbon; Then, after the flue gas enters the bag dust collector, the reactants at the front end and the smoke particles in the flue gas are intercepted by the filter bag; The flue gas from the bag filter enters the washing tower and is sprayed with sodium hydroxide solution to further remove acid gases such as hydrogen chloride and sulfide from the flue gas; The flue gas from the washing tower enters the SCR reactor after being heated to further remove the concentration of nitrogen oxides in the flue gas; The flue gas of SCR reactor is led to the chimney by induced draft fan and discharged at high altitude. The on-line smoke monitor is installed in the flue of the rear section of the induced draft fan to monitor whether the smoke emission concentration reaches the design emission limit in real time.