Chain furnace composite combustion system combining coal bed combustion and biomass gasification injection combustion

Abstract

The invention discloses a chain grate furnace composite combustion system with coal briquette layer combustion and biomass gasification spraying combustion combined. The chain grate furnace composite combustion system comprises a chain grate furnace, a heat exchanger, a mixer and a low-carbon gasifier. The low-carbon gasifier is connected between the mixer and the chain grate furnace and comprises a biomass gas outlet pipe located on one side of the chain grate furnace. Biomass gas generated in the low-carbon gasifier enters the chain grate furnace to be combusted through the biomass gas outlet pipe. One part of smoke exhausted out of the chain grate furnace enters the heat exchanger to exchange heat with air, and the other part of smoke exhausted out of the chain grate furnace enters the mixer to be mixed with the air to form mixed gas. One part of the mixed gas is used for gasification of the biomass material, and the other part of the mixed gas enters the chain grate furnace through the biomass gas outlet pipe of the low-carbon gasifier. According to the chain grate furnace composite combustion system, the energy utilization rate can be fully increased, he requirements of equipment of different powers can be met, and the chain grate furnace composite combustion system is suitable for improving and upgrading of existing chain grate furnaces.

Description

technical field [0001] The invention relates to a boiler combustion system, in particular to a composite boiler combustion system. Background technique [0002] The chain furnace is a highly mechanized layer-fired furnace widely used at present, and it is a small-capacity or medium-capacity furnace type mostly used in industrial production. The grate of the chain furnace is arranged in the shape of a chain crawler, and the coal blocks are burned during the movement process. The combustion conditions are relatively stable, and the smoke and dust emission concentration is highly controllable. However, due to its chain arrangement, the fuel layer has obvious combustion zones along the length of the grate arrangement, and chain furnaces mostly use coal as fuel. However, fossil energy such as coal, oil, and natural gas cannot Renewable resources have been gradually exhausted under the large-scale exploitation of human beings. In addition, these fuels will emit a large amount of...

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Problems solved by technology

The smokeless combustion process and equipment use biomass fuel to gasify and burn in chain boilers, but there are still the following shortcomings or deficiencies: (1) Only a single coal or biomass fuel is used, the combustion effect is not good, and it cannot be adjusted according to needs combustion mode; (2), the flue gas produced by combustion is directly discharged, and the exhausted flue gas is not recycled and reused, so the heat loss is large and the pollution to the environment is relatively large; (3), the grate used can be Coal is used as fuel, and biomass can be used as fuel. The specialization degree of the structure of the grate is limited. Therefore, for biomass fuel, the gasification utilization rate is low, and the best gasification state cannot be obtained, so the combustion efficiency is relatively low. Low

The biomass boiler adopts the combined combustion of syngas and semi-coke, which can improve the combustion efficiency, but the invention still has the following disadvantages or deficiencies: (1), due to the use of a single biomass as fuel supply, the heat that can be obtained by its combustion is limited, It cannot meet the needs of high-power equipment; (2), the flue gas generated by combustion is directly discharged, and the exhausted flue gas is not recycled and reused, so the heat loss is large and the pollution to the environment is relatively large; (3), the boiler furnace The wall does not adopt the waste heat recovery structure, which wastes part of the heat energy. The air used for combustion enters the furnace through multiple air chambers, but the waste heat of the boiler is not used to preheat the air; (4), the synthesis gas obtained after biomass gasification passes through The synthesis gas outlet pipe enters the furnace, but the necessary means are not used to fully mix and disturb the synthesis gas with the combustion air when entering the furnace, so the fuel mixing state is not good, the combustion is not complete, and the thermal efficiency is relatively low

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