Method for reducing fine particles of coal burning boiler

A fine particle, coal-fired boiler technology, applied in the direction of combustion methods, combustion equipment, fuel supply, etc., can solve the problems of equipment transformation and high operating costs, and the impact of boiler safe and stable operation, so as to reduce the amount of production and promote the semi-coke industry Effects of development and fuel cost reduction

Active Publication Date: 2015-07-29
XIAN THERMAL POWER RES INST CO LTD
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Problems solved by technology

The former has the characteristics of better removal effect, but the equipment transformation and operation costs are high; the latter has a certain effect on the control of fine particles, but may have a certain impact on the safe and stable operation of the boiler

Method used

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  • Method for reducing fine particles of coal burning boiler

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Embodiment

[0034] This embodiment is carried out on a 135MW bituminous coal boiler unit equipped with a medium-speed coal mill, and the specific implementation steps are as follows:

[0035] 1) According to GB / T 219-2008 "Measurement Method for Fusibility of Coal Ash" and GB / T 465-2007 "Test Method for Scouring and Wear Index of Coal", respectively, measure semi-coke and two kinds of raw coal (raw coal 1 and raw coal 2) Ash softening temperature ST (1160°C, 1300°C and 1310°C respectively) and scour wear index Ke (27.7, 1.1 and 1.0 respectively), determine that the blending ratio of blue carbon is 30%;

[0036] 2) Blending 30wt% semi-coke and raw coal 1 and 30wt% semi-coke and raw coal 2 in the coal yard evenly;

[0037] 3) In the four combustion stages, raw coal 1, 30wt% semi-coke and raw coal 1, raw coal 2, and 30wt% semi-coke and raw coal 2 are sent to the medium-speed coal mill, and the qualified fuel powder is ground once The wind is sent into the furnace;

[0038] 4) Collect flue ...

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Abstract

The invention discloses a method for reducing fine particles of a coal burning boiler. The method comprises the following steps of (1) measuring ash softening temperature ST and erosive wear index Ke of semi coke and raw coal, and according to the ash softening temperature ST and the erosive wear index Ke, determining the highest fuel semi coke blending proportion; (2) according to the highest fuel semi coke blending proportion, after uniformly mixing the semi coke and the raw coal, feeding the mixture into a coal pulverizer to uniformly mixing the semi coke and the raw coal to obtain semi coke powder and the raw coal powder which are uniformly mixed; (3) feeding the semi coke powder and the raw coal powder which are uniformly mixed into the hearth of the coal burning boiler by wind to be combusted. The method is simple in process and convenient to operate, and the method can be realized by most of the current thermal power generating units at a coal field through blending.

Description

Technical field: [0001] The invention belongs to clean coal combustion and pollutant discharge control technology, and in particular relates to a method for reducing fine particles of coal-fired boilers. Background technique: [0002] Coal will occupy a dominant position in my country's energy structure at present and for a long time to come. The process of coal-fired power generation is accompanied by a large amount of NOx, SO 2 , dust and other pollutants, among which the aerodynamic diameter of particles less than or equal to 1 μm, 2.5 μm and 10 μm are called PM1.0, PM2.5 and PM10 respectively. These fine particles are not only easy to enrich toxic heavy metals but also affect urban air quality and human health. The World Health Organization has listed PM2.5 as "a class of carcinogens". wide attention of the people across the country. [0003] The formation of fine particles mainly includes four mechanisms: the melting-coagulation mechanism of internal minerals, the cru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23K1/00F23K3/02
Inventor 姚伟杨忠灿王志超刘家利蒙毅王桂芳李炎
Owner XIAN THERMAL POWER RES INST CO LTD
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