Oxygen-adding ignition burner for coal-fired boiler of power station and ignition combustion-stabilizing method for oxygen-adding ignition burner

Abstract

The invention provides an oxygen-adding ignition burner for a coal-fired boiler of a power station and an ignition combustion-stabilizing method for the oxygen-adding ignition burner. The oxygen-adding ignition burner comprises a primary air channel, a pulverized-coal dense-thin separating device, a first-stage combustion chamber and a second-stage combustion chamber, wherein the pulverized-coal dense-thin separating device, the first-stage combustion chamber and the second-stage combustion chamber are arranged in the primary air channel in sequence. The oxygen-adding ignition burner is reasonable in structure, simple in design, high in combustion efficiency, low in oil consumption for ignition, low in equipment loss, environmentally friendly and reliable. According to the ignition combustion-stabilizing method for the oxygen-adding ignition burner for the coal-fired boiler in the power station, a low-oil oxygen-adding ignition method is provided by oil gun grading and an added gradedoxygen lance, adaption to the coal type is high, and the coal type with low volatile component can be effectively ignited; and the ignition combustion-stabilizing method can be used for low load combustion stabilizing of the boiler and ensures combustion stability of the boiler during running at a very low load, and the burn-off rate of pulverized coal is improved, so that the pulverized coal releases more heat by sufficient combustion, the flue gas temperature is raised, and the problems of instable combustion and the low flue gas temperature of an SCR inlet in low load running of the boilerare solved.

Description

technical field [0001] The invention relates to a burner for a coal-fired boiler in a thermal power plant, in particular to an oxygen-adding ignition burner for a coal-fired boiler in a power station and an ignition and stable combustion method thereof. Background technique [0002] Coal-fired boilers in thermal power plants are ignited using the traditional large oil gun ignition method. In the early stage of boiler start-up, the large oil gun is first ignited to preheat the combustion area in the furnace to the temperature required for the ignition of coal powder, and then put in coal powder for combustion. Boiler Raise the temperature and increase the pressure until the boiler reaches a certain load, and the combustion of the boiler is stable, and the large oil gun is removed. Due to the large oil gun ignition method, the torch produced by oil combustion is far away from the primary air pulverized coal flow, and the pulverized coal is not directly ignited. Only when the b...

AI Technical Summary

Problems solved by technology

The inability to burn stably when the boiler is running at a lower load is the main factor hindering the ability of the unit to achieve deep peak regulation

In addition, when the boiler is operating at low load, the flue gas temperature at the SCR inlet is low, which cannot meet the minimum ammonia injection temperature requirement for the operation of the denitrification catalyst, resulting in a low operation rate of the denitrification device

[0004] The existing plasma ignition technology and low-oil ignition technology are effective in igniting easily ignitable and combustible pulverized coal such as bituminous coal and lignite with high volatile content, but they cannot ignite low-volatile coal types and cannot meet the use requirements

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