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Coal thrower chain boiler for reducing NOx emission through flue gas recirculation

A flue gas recirculation, chain boiler technology, applied in combustion equipment, lighting and heating equipment, etc., can solve the problem of lack of practical application examples of industrial boilers, and achieve the effect of short transformation period and low investment cost

Inactive Publication Date: 2016-10-26
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above two types of NOx emission control technologies are mostly used in coal-fired power plant boilers, and there is still a lack of practical application examples in industrial boilers

Method used

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  • Coal thrower chain boiler for reducing NOx emission through flue gas recirculation

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] Such as figure 1 As shown, the coal thrower chain boiler using flue gas recirculation to reduce NOx emissions includes chain grate 1, coal thrower 2, furnace 3, drum 4, economizer 5, air preheater 6, and dust collector 7 , desulfurization tower 8, induced draft fan 9, chimney 10, flue gas recirculation fan 11, primary fan 12 and secondary fan 13; the lower area of ​​the chain grate 1 has multiple primary air chambers (1# ~ 4# are primary air chambers 1~4); the tail flue of the furnace 3 is arranged in sequence with an economizer 5, an air preheater 6, a dust collector 7, a desulfurization tower 8, an induced draft fan 9 and a chimney 10; the primary fan 12 After the air is inhaled, it is preheated by the air preheater 6 to form primary air, which is sent into each primary air chamber (1#, 2#, 3#, 4#); The preheated air is extracted to form seco...

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Abstract

The invention discloses a coal thrower chain boiler for reducing NOx emission through flue gas recirculation. The coal thrower chain boiler comprises a chain grate stoker, a coal thrower, a hearth, a boiler barrel, a coal economizer, an air pre-heater, a dust remover, a desulfurization tower, an induced draft fan, a chimney, a primary air fan, a secondary air fan and a flue gas recirculation air fan. The lower portion of the chain grate stoker is provided with a plurality of primary air chambers. Air is sucked through the primary air fan, then is preheated through the air pre-heater, forms primary air and is fed into all the primary air chambers. The preheated air is extracted from a primary air pipeline by the secondary air fan, forms secondary air and is fed into the hearth and the coal thrower. A flue gas recirculation main pipeline is led out in the position, between the dust remover and the desulfurization tower, of a flue gas pipeline, and the flue gas recirculation air fan is installed in the flue gas recirculation main pipeline. Two recirculation flue gas branched pipelines are connected to the positions, at an outlet of the flue gas recirculation air fan, of the flue gas recirculation main pipeline and are used for feeding recirculation flue gas into the primary air chambers and an inlet of the secondary air fan correspondingly. According to the coal thrower chain boiler for reducing NOx emission through flue gas recirculation, the investment cost is low, the transformation period is short, and NOx emission can be reduced by 50% or above.

Description

technical field [0001] The invention relates to a coal thrower chain boiler, in particular to a coal thrower chain boiler which adopts flue gas recirculation to reduce NOx emissions, and belongs to the technical field of industrial boiler environmental protection. Background technique [0002] Chain furnaces are widely used in coal-fired industrial boilers in my country. They are the main method of industrial boiler combustion equipment in my country, accounting for about 60% of the total industrial boilers. Chain furnaces are often used in concentrated areas of urban residents, and most of them are low-altitude emissions, which makes industrial boilers particularly pollute the surrounding environment, especially urban environments, and NOx occupies a large share of pollutants. As a kind of chain furnace, the coal thrower chain boiler is developed on the basis of the forward-rotating chain grate boiler. Through the chain grate reversal and the mechanical wind coal throwing e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C9/06
Inventor 凌忠钱曾宪阳
Owner CHINA JILIANG UNIV
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