Low-nitrogen combustion device for coal powder gasification combustion and combustion method

A low-nitrogen combustion, pulverized coal technology, which can be applied in combustion methods, combustion using multiple fuels, combustion using lump fuels and gaseous fuels, etc., can solve problems such as reduction of NOx emission concentration

CN109458612APending Publication Date: 2019-03-12晋能电力集团有限公司 +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-03-12

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Abstract

The invention discloses a low-nitrogen combustion device for pulverized coal gasification combustion. The device comprises a multi-tangent-circle combustion hearth, wherein the multi-tangent-circle combustion hearth comprises a hearth angle wall and a hearth side wall, the furnace wall of the hearth is provided with one or more columns of nozzle groups which are arranged in the height direction, the nozzle groups comprise powder lower air nozzles, gasification nozzle groups, combustion-supporting air nozzles and top air nozzles, the gasification nozzle groups comprise first primary air nozzlegroups, second primary air nozzle groups and gasification air nozzle groups, and first primary air nozzles involved in the first primary air nozzle groups, second primary air nozzles involved in the second primary air nozzles groups and gasification air nozzles involved in the gasification air nozzle groups are sequentially arranged in the same direction or in the reverse directions according to the airflow horizontal rotating direction. The invention further discloses a method for performing low-nitrogen combustion based on the low-nitrogen combustion device for the pulverized coal gasification combustion. According to the low-nitrogen combustion device for the pulverized coal gasification combustion and the method, the generation of fuel type NOx and thermodynamic NOx can be fully inhibited; and the burnout stage is mainly the combustion of coal gas, and the amount of coke and the amount of fuel nitrogen in the coke are extremely low.
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Description

technical field

[0001] The invention relates to the field of pulverized coal combustion equipment. Specifically, the invention relates to a low-nitrogen combustion device and a combustion method for pulverized coal gasification combustion. Background technique

[0002] The traditional air staged combustion technology mainly uses the increase of the burn-off air and the distance to the main combustion zone to control the reducing atmosphere and the area range of the reducing atmosphere in the furnace, but the oxygen-enriched burn-off stage is delayed and the coke with lower reactivity The combustion temperature is reduced and the combustion time is shortened, resulting in an increase in the content of fly ash combustibles and a decrease in boiler efficiency. At the same time, the large-scale reducing atmosphere in the furnace also increases the probability of coking in the furnace and high-temperature corrosion of the water wall. In addition, due to the influence of coke nit...

Examples

Embodiment Construction

[0079] The following is an embodiment of the present invention, which shows a low-nitrogen combustion device and combustion method for pulverized coal gasification combustion, which is only used as an explanation of the present invention and not a limitation.

[0080] The low-nitrogen combustion device for pulverized coal gasification combustion provided by the present invention includes a multi-tangential combustion furnace, and the multi-tangential combustion furnace includes furnace corner walls and furnace side walls, and multiple tangential combustion furnace walls. A row of nozzle groups arranged along the height direction, the nozzle group includes the powder downwind nozzle 1, the gasification nozzle group composed of the gasification air nozzle 2, the second primary air nozzle 3 and the first primary air nozzle 5, and the combustion air The spout 6 and the top wind spout 7;

[0081] Among them, the first primary air nozzle, the second primary air nozzle and the gasifi...