A solid fuel gasification incineration boiler

Abstract

The invention relates to the technical field of boiler equipment, in particular to a solid fuel gasification incineration boiler. The solid fuel gasification incineration boiler is simple in structure, few in arranged heated faces and capable of saving investment cost and operation cost, and the boiler is environmentally friendly and efficient. A feeding hopper is connected with a hearth, the hearth comprises a front arch, a first rear arch and a second rear arch which are sequentially and obliquely arranged, the first rear arch is lower than the front arch and the second rear arch, a core combustion area is formed by the front arch and the first rear arch, a smoke internal circulation loop is formed by the first rear arch and the second rear arch, and a clearance is reserved between the lower end of the first rear arch and the second rear arch. An air distribution bed is arranged at the position, below the inclined face of the lower portion of the first rear arch, of the bottom of the hearth, the lower end of the air distribution bed is connected with an air chamber, and a main combustion area is formed by the front arch at the upper end of the first rear arch and the second rear arch. A hearth outlet is connected with a cyclone separator, the particle outlet end of the cyclone separator is connected with one end of a loop flue, the smoke outlet end of the cyclone separator is connected with a tail flue, and the other end of the loop flue is connected with the smoke internal circulation loop.

Description

technical field [0001] The invention relates to the technical field of boiler equipment, in particular to a solid fuel gasification and incineration boiler. Background technique [0002] Low calorific value solid fuel boilers such as garbage and sludge are used as harmless utilization and recovery treatment devices for low calorific value solid fuels such as garbage and sludge. There are currently two types of boilers, one is low calorific value solid fuel boilers such as grate garbage and sludge 1. One is a circulating bed garbage boiler that burns highly combustible substances (such as coal). Grate garbage, sludge and other low calorific value solid fuel boilers adopt the grate combustion method, the structure of the grate and hydraulic mechanism is complex, the initial investment is high, and the combustion adopts the oxygen-enriched high-temperature combustion method, which produces a large amount of harmful gases and smoke The cost of gas treatment is high, because the...

AI Technical Summary

Problems solved by technology

Grate garbage, sludge and other low calorific value solid fuel boilers adopt the grate combustion method, the structure of the grate and hydraulic mechanism is complex, the initial investment is high, and the combustion adopts the oxygen-enriched high-temperature combustion method, which produces a large amount of harmful gases and smoke The cost of gas treatment is high, because the amount of ash produced by garbage combustion is large, and the effect of gravity separation is limited. A large number of ash hoppers and ash treatment and conveying equipment are used, which increases investment and operation costs. In addition, due to the low calorific value of garbage, sludge, etc. The low calorific value of solid fuel makes the amount of flue gas limited. The flue gas flow rate in the furnace is low, and the heat transfer effect of the heating surface is poor. Many heating surfaces need to be arranged in the boiler, which increases the investment cost.

The heating surface at the tail adopts the method of vibrating and ash removal, which increases the operating cost, and also often causes damage to the wall pipe at the tail, which affects the operation of the boiler

Circulating bed boilers using cyclone separators have low calorific value and large calorific value changes due to the low calorific value of solid fuels such as garbage and sludge. At this stage, all of them are mixed-fired, which limits the waste treatment capacity and consumes a lot of coal. Resources and garbage disposal are needed in every city, but not every city has coal resources, and the transportation cost of coal is also an important reason why the mixed-firing circulating fluidized bed cannot be popularized. At the same time, this kind of boiler also uses oxygen-enriched combustion way, so that the amount of harmful substances produced is large, and the cost of flue gas treatment is increased

Coal gangue, lignite, etc. generally adopt circulating fluidized bed combustion technology, and the high oxygen content in the primary air is burned, which produces many harmful substances and has no obvious gasification process

Images