Pulverized coal fractional burner by taking reburning inert component added water electrolysis gas as heat source

Abstract

The invention relates to a coal burner, and discloses a pulverized coal fractional burner by taking reburning inert component added water electrolysis gas as a heat source. The pulverized coal fractional burner by taking the reburning inert component added water electrolysis gas as the heat source is characterized in that the pulverized coal fractional burner comprises a first-stage primary gas pipe (4), a second-stage primary gas pipe (10), a premixed gas burning chamber (11), an inert component inlet box (6), a water electrolysis gas inlet pipe (7) and a secondary gas pipe (3); the inert component inlet box (6) and the water electrolysis gas inlet pipe (7) are arranged at the rear part of the premixed gas burning chamber (11); the inert component inlet box (6) and the water electrolysis gas inlet pipe (7) at the rear part of the premixed gas burning chamber (11) jointly form a gas premixing device; a whole gas premixing process adopts a convergence-first and diffusing-later laval nozzle mode; and the pulverized coal fractional burner is provided with an inert component (CO2 or N2) gas storage tank (9) and a water electrolysis device (8). The pulverized coal fractional burner takes the reburning inert component added water electrolysis gas as the heat source, can realize the effect of oil-free ignition, and is suitable for burning of pulverized coal fired boilers with different coal quality characteristics.

Description

technical field [0001] The invention relates to a coal burner, in particular to a pulverized coal graded burner which takes reburning of water electrolysis gas added with an inert component as a heat source. Background technique [0002] During the perennial operation of power plant boilers, there must be two operating conditions, namely the ignition stage and the low-load operation stage. In these two stages, the temperature of the pulverized coal flow entering the furnace is low, and it is difficult to achieve stable ignition and combustion. , in order to achieve stable combustion of pulverized coal gas flow, it can be achieved by burning easily combustible fuels (such as oil and natural gas) or external heat sources (such as high temperature plasma and hot air ignition). [0003] In the past ten years, due to the increase in the price ratio of oil and coal, the enthusiasm and urgency of coal-fired power plants to save fuel have also increased significantly, and the develo...

AI Technical Summary

Problems solved by technology

At present, the technology of electrolyzing water to produce hydrogen is relatively mature. Therefore, many experts and scholars have proposed patents using hydrogen as a heat source, such as publication number CN101187473A "Hydrogen-Oxygen Mixed Gas Burner" and publication number CN101532678A "Power Station Coal-fired Boiler Brown Gas (hydrogen oxygen) ignition system", but the above patents all use the direct combustion of hydrogen and oxygen, which is difficult to achieve in the actual process. The reason is that the deflagration velocity of hydrogen is as high as 200m / s, and direct combustion is prone to explosion. Therefore, the present invention proposes a method to add inert components (CO 2 or N 2 ) of water electrolysis gas is reburned as a heat source burner to achieve stable ignition of pulverized coal

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