A low-concentration oxygen-enriched fluidized suspension combustion method of coal-water slurry and its boiler device

Abstract

The invention relates to a coal water slurry low-concentration oxygen enrichment fluidization suspension combustion method and boiler device. Zeolite molecular sieve oxygen enrichment devices are adopted to manufacture 24 to 30 percent of low-concentration oxygen enrichment air, the air is heated through an air preheater, primary air, secondary air and graining air pass through a fluidized bed, a secondary air opening and a coal water slurry granulator respectively to enter a combustion chamber, fluidization suspension combustion is achieved, the ignition and combustion condition of the coal water slurry boiler is improved, the ignition temperature of fuel is reduced, the combustion temperature, the combustion rate and the combustion-off rate are improved, the ignition and combustion stability of the fuel is improved, the adaption range of the coal water slurry boiler to the coal water slurry fuel is widened, and the boiler can be suitable for combusting coal water slurry made of inferior coal and also suitable for combusting sludge-coal blending coal water slurry fuel and sludge-coal slurry mixing coal water slurry fuel. The fuel cost and the production cost are reduced, the significant economic value is achieved, and the great social significance in improving the environment is achieved.

Description

technical field [0001] The invention belongs to the technical field of coal-water slurry fluidized suspension combustion technology and coal-water slurry boiler technology, and specifically relates to a low-concentration oxygen-enriched fluidized suspension combustion method of coal-water slurry and a boiler device thereof. Background technique [0002] Coal-water slurry combustion technology is called the clean combustion technology of coal. my country began to conduct experimental research on coal-water slurry boilers in the 1970s, and has made great progress in the past 40 years. At present, coal-water slurry boilers are divided into two types: fluidized suspension combustion and atomization suspension combustion. Compared with the atomized suspension combustion method, the coal-water slurry fluidized suspension combustion method has many advantages, such as realizing low-temperature combustion, solving the worldwide problem that the coal-water slurry boiler is easy to co...

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Problems solved by technology

[0004] In order to give full play to the advantages of the coal-water slurry fluidized suspension combustion method, overcome the insufficient wide adaptability of coal-water slurry fuel, insufficient combustion stability, high-concentration oxygen-enriched combustion and increased NOx generation and emissions, complex oxygen-enriched preparation equipment, and high energy consumption And the disadvantage of high cost, the present invention proposes a low-concentration oxygen-enriched fluidized suspension combustion method of coal-water slurry and its boiler device

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