Dry method flue gas treatment system applicable to village and town waste incineration

Abstract

The invention discloses a dry method flue gas treatment system applicable to village and town waste incineration. A secondary combustion chamber is connected to a quench tower by a hot air pipeline; one side of the quench tower is connected with a water tank; the rear side of the quench tower is connected with a dust collector by a low-temperature pipeline; two assistant bins are connected with the low-temperature pipeline by a feeder; a feed end of the feeder is connected with a discharge end of a spiral charging device; a dust collector inlet valve, a dust collector inlet thermocouple and a cold air valve are mounted on the low-temperature pipeline; the quench tower is connected with a chimney by a bypass pipeline; a bypass valve thermocouple is mounted in the bypass pipeline; a bypass valve and a manual regulating valve are arranged on the bypass pipeline; an outlet pipe of the dust collector is connected with a fan; an air inlet of the fan is connected with the outlet pipe of the dust collector; an air outlet of the fan is connected with the chimney. According to the system, moisture in the quench tower can be sufficiently evaporated; the possibility of bag sticking of filter bags of the dust collector is low; the system can safely and long operate; the possibility of dust bonding in a dust hopper is low; the dust collector can be normally started; flue gas can meet standard discharge.

Description

technical field [0001] The invention relates to the field of garbage incineration in villages and towns, in particular to a dry flue gas treatment system suitable for incineration of garbage in villages and towns. Background technique [0002] In the process of waste incineration, due to the existence of a large number of chloride ions, dioxins will inevitably be produced. The conditions for the formation of dioxins are 200-750°C, and the internal temperature of the incinerator and the secondary combustion chamber is generally controlled above 850°C. There will be no generation of dioxins, but there will be recombination of dioxins in the process from the incinerator to the chimney discharge, so the shorter the time, the less the amount produced. The quench tower uses a two-fluid spray gun (into the spray gun) The high-pressure gas is a mixture of high-pressure gas and water. The function of high-pressure gas is to make the water atomized well. The diameter of water droplets...

AI Technical Summary

Problems solved by technology

[0003] The traditional quenching tower is basically a cylinder with a diameter of about 1200mm and a height of 9000mm. A spray gun is installed in the middle of the top. On the inner surface of the tower, because the middle temperature of the tower is several hundred degrees, the outer surface of the tower is in contact with the atmosphere, and the temperature is relatively low, so the water injected into the inner surface of the tower itself will condense and cannot evaporate, and can only flow along the tower. The liquid flows down and accumulates at the bottom of the tower and accumulates more and more, because the residual water is acidic and easy to corrode the equipment. More importantly, the water mixed with the flue gas is pumped into the dust collector behind, which will cause paste bags and make the whole system crash

[0004] The working method of garbage incineration in villages and towns is to incinerate during the day and shut down at night, which is no different from large-scale incineration 24 hours a day (24 hours of incineration, the gas temperature inside the dust collector can be kept above 150 degrees, and there will be no condensation), so When shutting down, the high-temperature and high-humidity flue gas accumulated in the dust collector will condense due to natural cooling, causing the filter bag to be pasted, and it cannot be started normally the next day, and because the dust of the garbage flue gas is more viscous than ordinary dust , so it is easy to coalesce in the ash hopper area

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