Waste incineration boiler of fire grate type circulating fluidized bed and working method thereof

Abstract

The invention discloses a waste incineration boiler of a fire grate type circulating fluidized bed and a working method thereof and belongs to the technical field of household waste incineration fluegas treatment. A front stock bin of the boiler is connected to a feeding device, the feeding device is connected to a feeding fire grate, and the tail end of the feeding fire grate is connected to a feed inlet of the boiler; one end of a conveying fire grate is arranged below the feed inlet of the boiler while the other end of the conveying fire grate is connected to a deslagging pipe; a fluidizedair distributing device is arranged on the conveying fire grate and is connected to a primary air system; a hearth is connected to a secondary air hose; the upper side of the hearth is connected to ahorizontal flue, the horizontal flue is connected to an inlet of a return system, a return outlet of the return system is connected to a return port of the boiler through a return vertical pipe, anda flue gas outlet of the return system is connected to a tail flue. The waste incineration boiler improves the stability of feeding and deslagging, so that materials are combusted uniformly and stably, discharge of harmful pollutants is reduced, the efficiency of the boiler is improved and the blowing out risk is avoided.

Description

technical field [0001] The invention belongs to the technical field of domestic waste incineration flue gas treatment, and in particular relates to a grate type circulating fluidized bed waste incineration boiler and a working method thereof. Background technique [0002] Since 2010, the amount of domestic garbage removal has increased year by year. A large amount of solid waste is extremely harmful to the environment, mainly manifested as land occupation, air pollution, soil and water, and the damage caused is difficult to recover. The low level of existing municipal solid waste disposal technology, the need for large amounts of funds for domestic waste disposal, and serious environmental pollution have become one of the important bottlenecks that affect the living environment of cities in my country and restrict urban development. At present, my country basically adopts three methods of landfill, composting and incineration to solve urban domestic waste. Compared with lan...

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Problems solved by technology

[0002] Since 2010, the amount of domestic garbage removal has increased year by year, and a large amount of solid waste is extremely harmful to the environment, mainly manifested as land occupation, air pollution, soil and water bodies, and the damage caused is difficult to recover

However, there are still the following problems: the investment cost of the equipment is high, and the floor area is large; the temperature distribution and combustion of the grate and the upper furnace are unstable and uneven, the burnout rate is low, and the original emission concentration of NOx and other pollutants is too high ; Tail flue gas environmental protection equipment is complicated and the operating cost is high

However, the existing circulating fluidized bed domestic waste boilers generally have problems such as unstable feeding and combustion, large amount of fly ash, and high maintenance frequency.

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