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Coal fired boiler capable of controlling flue gas oxygen content

A technology for flue gas oxygen content, coal-fired boilers, applied in the field of coal-fired boilers, can solve problems such as difficulty in controlling excess air volume in the furnace and pollution of the surrounding environment, to broaden flexibility and diversity of operation modes, reduce pollution, The effect of low furnace temperature

Inactive Publication Date: 2009-09-30
NINGBO YINUO ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the disadvantage of existing mechanical coal-fired boilers is that it is difficult to control the amount of excess air in the furnace during operation, resulting in NO X Excessive emissions cause pollution to the surrounding environment

Method used

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  • Coal fired boiler capable of controlling flue gas oxygen content
  • Coal fired boiler capable of controlling flue gas oxygen content
  • Coal fired boiler capable of controlling flue gas oxygen content

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Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0028] The purpose of the present invention is to improve the combustion process of coal-fired boilers to improve boiler efficiency and increase output; while reducing smoke and NO X Emissions; that is, it can not only improve the boiler operation effect but also reduce the pollution to the ambient air.

[0029] Figure 1 to Figure 5 An embodiment of the present invention is shown, which includes a furnace body 1 with a furnace 3, a heating surface 11 composed of a plurality of heated pipes is arranged in the furnace, a fire grate 2 is arranged at the lower part of the furnace, and a belt with Furnace bottom air chamber 21 of the blower; the flue gas in the furnace enters the dust collector 7 with the front Venturi channel 12 through the heating surface, and the rear end of the dust collector discharges the flue gas in the furnace through the...

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Abstract

The invention relates to a coal fired boiler capable of controlling flue gas oxygen content, which comprises a furnace body provided with a fire grate and a hearth, wherein the lower part of the fire grate is provided with a furnace bottom wind box; fuel gas in the hearth is exhausted from a chimney by a draught fan after passing through a venturi passage and a dust remover; an oxygen content analysis sensor is arranged between the hearth and the venturi passage and is connected with an oxygen content PLC; a fuel gas return pipe provided with a circulating fan is arranged between the draught fan and the chimney; the other end of the oxygen content analysis sensor is connected with an upper layer fuel gas return pipe with an upper layer fan and a wind box fuel gas return pipe respectively; the upper layer fuel gas return pipe is provided with an upper layer wind control valve, is controlled by the oxygen content PLC and is communicated with the hearth; the wind box fuel gas return pipe is provided with a wind box control valve and is controlled by a wind box temperature PLC; and the circulating fan and the upper layer fan are driven by an alternating current variable frequency speed control motor and are controlled by the wind box temperature PLC and the oxygen content PLC respectively. The coal fire boiler has the advantages that: firstly, the coal fire boiler can run under lower excess air and the hearth temperature is low during running so that the benefit of the boiler can be improved remarkably and the environmental pollution caused by the emission of NOx is reduced; and secondly, the coal fired boiler can adopt more extensive coal with low ash melting point to enlarge the serviceable range of the boiler and prolong the service life of the coal fired boiler.

Description

technical field [0001] The invention relates to the field of a coal-fired boiler, specifically a coal-fired boiler that controls the oxygen content of flue gas; it is especially suitable for transforming existing mechanical coal-fired boilers to improve boiler efficiency and increase output, while reducing smoke and NO X emission. Background technique [0002] The structure of the existing mechanical coal-fired boiler includes a furnace body and a heating pipe system arranged in the furnace body. The lower part of the furnace body is provided with a grate, and the upper part of the grate is provided with a furnace; Bottom combustion chamber for blower. The combustion flue gas of the furnace enters a dust collector through the heated pipe system, and then is discharged outside through the chimney. In addition, furnace arches are arranged at the front and back of the furnace, and the furnace arch is usually provided with a secondary air device, which is used to stir the comb...

Claims

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Application Information

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IPC IPC(8): F23B80/02F23N5/00
Inventor 朱世明徐国武肯内斯L·马龙
Owner NINGBO YINUO ENERGY TECH
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