Secondary air system of circulating fluidized bed household garbage incinerator

Abstract

The invention provides a secondary air system of a circulating fluidized bed household garbage incinerator. Household garbage enters the secondary air system from a feeding port in the side face of a hearth and is combusted, formed high-temperature flue gas enters a cyclone dust collector for gas-solid separation, a separated solid part enters the hearth again to be combusted, a separated gas part enters a flue gas purification device after heat exchange and cooling are conducted on the separated gas part and boiler feed water through a waste heat boiler, and then the separated gas part is exhausted through a chimney by means of an induced draft fan. The secondary air arrangement manner that upper secondary air is arranged in a hedging manner, and lower secondary air is arranged in a staggered manner is adopted, the disturbance intensity of the secondary air can be guaranteed, the contact opportunity of gas-phase combustible matter and oxygen is increased, and the gas-phase combustible matter is combusted out. The upper layer of secondary air and the lower layer of secondary air are arranged at the four corners of the respective section layer in a tangent circle manner, sufficient mixing of the flue gas and the oxygen can be achieved at the low secondary air speed, the flue gas staying time is prolonged, the combustion-off rate is increased, and power consumption is reduced. The mixing effect of the flue gas and an SNCR reducing agent can be improved, the SNCR efficiency is improved, and the unit consumption of the reducing agent is reduced.

Description

technical field [0001] The invention relates to the field of garbage treatment, in particular to a secondary air system of a circulating fluidized bed household garbage incinerator. Background technique [0002] With the development of the economy and the improvement of residents' living standards, the amount of domestic waste generated by residents in their daily life and production has gradually increased. According to statistics, the current urban residents in our country produce about 270 million tons of domestic waste every year, and the annual growth rate is 10%. However, domestic waste incineration has problems such as high cost of pollutant emission control and serious coking in the furnace, especially in the context of strict environmental protection requirements and the collection of environmental protection taxes for corporate emissions. If enterprises can reduce pollutant emissions, it will not only benefit the business market competitiveness, and will also buil...

AI Technical Summary

Problems solved by technology

[0004] In view of these problems, the present invention provides a circulating fluidized bed secondary air double-layer tangential combustion technology, which is used to solve the problem that the secondary air distance between the front and rear walls is relatively long, and the secondary air velocity must be high enough to ensure the combustion efficiency of gas phase combustibles problems, as well as the problem of uneven flue gas flow and generally low SNCR efficiency caused by the hedging arrangement of the upper and lower secondary air layers

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