Combustor with adjustable gas flow rate of pulverized coal of W-flame boiler and adjusting method of combustor

Abstract

The invention provides a combustor with the adjustable gas flow rate of pulverized coal of a W-flame boiler and an adjusting method of the combustor. The gas flow rate of the thick pulverized coal andthe concentration of the pulverized coal can be adjusted, and the combustor can be suitable for bituminous coal, lean coal and anthracite. The combustor comprises a two-stage pulverized coal thick and thin separating device, a thick-phase pulverized coal gas flow outlet pipe, a thick-phase pulverized coal gas flow nozzle, a thin-phase pulverized coal gas flow outlet pipe, a thin-phase pulverizedcoal gas flow nozzle and an adjusting baffle. The two-stage pulverized coal thick and thin separating device comprises a cylindrical shell, a flow guide bluff body, a rotational flow impeller, a supporting rod, a thick-phase pulverized coal gas flow outlet and a thin-phase pulverized coal gas flow outlet. Through the flow guide bluff body and the rotational flow impeller in the two-stage pulverized coal thick and thin separating device, the efficient thick and thin separating of the pulverized coal gas flow is realized, the thick-phase pulverized coal gas flow serves as the main pulverized coal gas flow for organizing the combustion of the W-flame boiler and is sprayed into the boiler through the thick-phase pulverized coal gas flow outlet pipe and the thick-phase pulverized coal gas flownozzle to organize the combustion, and the thin-phase pulverized coal gas flow is sprayed into the boiler through the thin-phase pulverized coal gas flow outlet pipe and the thin-phase pulverized coalgas flow nozzle to combust.

Description

technical field [0001] The invention relates to energy-saving and emission-reduction transformation technology for coal-fired thermal power units, in particular to a burner with adjustable pulverized coal airflow velocity for a W-flame boiler and an adjustment method thereof. Background technique [0002] W flame boiler is the main furnace type for burning low-volatile coal such as low-quality lean coal and anthracite, and has great advantages when burning low-volatile coal. However, with the continuous development of railway transportation and the opening up of overseas coal markets, power plants with W flame boilers in many regions can purchase lower-priced bituminous coal. Therefore, the increasingly severe coal market situation has put forward new requirements for W flame boilers, that is, a large proportion of bituminous coal must be burned to control the fuel cost of power plants. [0003] However, the burner of the W flame boiler is designed for low-volatile coal. Wh...

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Problems solved by technology

[0003] However, the burner of the W flame boiler is designed for low-volatile coal. When burning bituminous coal, it will not only affect the combustion efficiency and the control of pollutants such as NOx, but also have adverse consequences such as burning of the burner nozzle, which cannot adapt to the new situation. Usage requirements

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