Method for measuring primary air-coal powder burning distance and coals for DC (direct current) burner of coal-fired boiler

Abstract

The invention relates to a method for measuring the primary air-coal powder burning distance and coals, comprising the following steps: firstly, segmenting a primary air channel, measuring the length li of each section of air channel, the primary air temperature Ti of each section of air channel and the primary air temperature Tn of a burning distance section; measuring the primary air velocity Vi of each section of air channel, and the primary air velocity Vn of the burning distance section; measuring the coal powder concentration coali of the section of air channel and the coal powder concentration coaln of the burning distance section; measuring the coal powder fineness R90 of each section of air channel, that is, the percentage of coal powder which dose not pass through a 90mu m sieve is measured; measuring oxygen content Oi in the primary air of each section of air channel and oxygen content On in the primary air of each section of burning distance; measuring a coal quality parameter M of each section of the air channel; and substituting the measured parameters into a formula for computing, and obtaining the burning distance ln by computing the final section of air channel. Compared with the prior art, the method is utilized to collect the primary air channel length, the primary air temperature, the primary air velocity, the coal powder concentration, the coal powder fineness, the oxygen content, the coal quality parameters, the temperatures of the burner areas around a nozzle and other real-time parameters, thus computing the actual burning distance more accurately, which has significance on reasonable design of the boiler and safe running of changing the coals. Meanwhile, if the burning distance is known, online monitoring on the coal changes can be realized, thereby carrying out reasonable air distribution, improving the burning efficiency of the boiler and reducing pollutant emission.

Description

technical field [0001] The invention relates to the field of thermal power generation, in particular to a method for measuring the ignition distance and coal type of primary air powder of a once-through burner of a coal-fired boiler. Background technique [0002] The ignition distance of the primary wind powder air flow is very important to the combustion of the boiler. If the ignition distance is too close, the nozzle may be burned or slagging may occur; if it is too far, the fire may be extinguished. Generally, it is controlled within the range of 0.3-1.5m from the nozzle. However, at present, there is no good method for measuring the ignition distance, which will inevitably affect the design and safe operation of the power plant boiler to a certain extent, and there are potential safety hazards. At the same time, it will also affect the boiler efficiency of the power plant, thereby reducing the economic benefits of the power plant . [0003] Because the coal burning in t...

AI Technical Summary

Problems solved by technology

However, at present, there is no good method for measuring the ignition distance, which will inevitably affect the design and safe operation of the power plant boiler to a certain extent, and there are potential safety hazards. At the same time, it will also affect the boiler efficiency of the power plant, thereby reducing the economic benefits of the power plant

[0003] Because the coal burning in the power plant is sometimes tight, and the coal type cannot be burned according to the design, so the frequent coal type combustion and coal blending combustion, and the lack of time to do the feasibility calculation of the coal type change, this leads to the inability to rationally distribute the air, and the boiler combustion Reduced efficiency and increased pollutant emissions

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