Blending combustion method applied to blending combustion of low-ash-fusion-point high-sulfur lignite in pulverized coal fired boiler fuel
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A pulverized coal boiler, ash melting point technology, applied in the combustion method, block/powder fuel preparation, combustion using block fuel and powder fuel, etc. Insufficient and other problems, to achieve the effect of easy accumulation, avoid coking, and reduce residence time
Pending Publication Date: 2021-12-07
CPI NORTHEAST ENERGY SAVING TECH +1
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[0011] First of all, solve the problem that the coal has a high water content and cannot be used in the original boiler system
In order to solve the problem of insufficient drying output, other heat sources must be introduced
Method used
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Embodiment 1
[0031] like Figure 1 to 4 and Figure 7 , The present embodiment employs hedge pulverized coal boiler, the furnace has a rectangular cross section, formed around a front wall, rear wall, left wall, right wall. Hedge pulverized coal boiler with seven mill, mill named a, B mill, mill C, mill d, E mill, pulverizer mill f and g. In the boiler front wall and back wall are arranged with a burner and overfire air nozzle, wherein the front wall from bottom to top Burner A, a combustion C, and burner E, G, and overfire air burner nozzle K, where combustion A is the A 1 Layer, located in the burner C C 1 Layer, a burner positioned E E 1 Layer, located in the burner G G 1 Layer, A 1 Layer, C 1 Layer, E 1 Layer, and G 1 Main combustion zone layer, A 1 A total of 5 layers burner, its horizontal elevation is identical, named A1 ~ A5 burner, all from a mill coal feed; C 1 Layer co burner 5, which is identical to the level of elevation, named C1 ~ C5 burner, all the mill coal feed c; E 1 Layer co ...
Embodiment 2
[0038] like Figure 5 with Image 6 , The present embodiment employs a pulverized coal type boiler Tangentially, furnace square in cross section, formed around a front wall, rear wall, left wall, right wall; burner disposed at four corners of the junction of the furnace wall, named corners They were 10 cents, 20 corners, and the four corners of the triangle. This boiler with five mill, mill named a, B mill, mill C, E mill and mill d; sequentially from the bottom corners of the boiler is provided with a burner A, combustion B is, combustor C, and D burners, overfire air burner nozzle E and F., a total of four burners A, which is exactly the same level of elevation, named named A1 ~ A4 burner; burner B total 4, which is exactly the same level of elevation, named named as B1 ~ B4 burner; C a total of four burners, the level of elevation which are identical, are designated as named C1 ~ C4 burner; burner D total 4, which is exactly the same level of elevation, named D1 ~ D4 are respecti...
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Abstract
The invention discloses a blending combustion method applied to blending combustion of low-ash-fusion-point high-sulfur lignite in pulverized coal fired boiler fuel. The blending combustion method comprises the following steps: step one, transforming an original boiler, additionally arranging a steam-primary air heater in a primary air channel between an air preheater and a coal mill of the original boiler, producing steam of the steam-primary air heater from tertiary extraction of a steam turbine, and heating primary air at an outlet of the air preheater through the steam-primary air heater; and step two, conveying the coal for normal combustion and the low-melting-point high-sulfur lignite to different coal mills correspondingly and milling the coal into pulverized coal in the different coal mills, then conveying the pulverized coal to different combustors of the pulverized coal boiler to be combusted, namely, conveying the pulverized coal of the low-ash-fusion-point high-sulfur lignite to a lower-layer combustor and conveying the pulverized coal of the coal for normal combustion to an upper-layer combustor. Compared with a stokehole blending combustion mode of feeding coal after blending in a coal yard, the blending combustion mode of carrying out separate grinding and blending combustion in the boiler can be more targeted in air distribution adjustment; and the problem of non-uniform stokehole blending can also be prevented.
Description
Technical field [0001] The present invention pertains to a boiler for thermal power generation coal blending technology, and in particular relates to a method of blending the pulverized coal boiler fuel blending low sulfur lignite ash melting point. Background technique [0002] In recent years go by coal production and coal market impact, thermal power plant coal procurement difficulties, powder coal fire boilers burning coal design has been almost impossible. High-sulfur lignite lower prices, the market is relatively relaxed, in order to ensure coal supply or reduce the unit cost of power generation, heat supply electricity and heat protection, try blending high-sulfur lignite. [0003] Blending high-sulfur coal, sulfur dioxide emissions will inevitably lead to increased pollutant emission limits for coal-fired boilers are very strict, so that did not transform desulfurization system, or poor desulfurization system output of coal-fired boiler emissions reach threshold requireme...
Claims
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