Circulating fluidized bed boiler

Abstract

The invention relates to the technical field of boilers, in particular to a circulating fluidized bed boiler, which comprises a boiler, wherein the boiler is provided with a primary air inlet and a secondary air inlet, both the primary air inlet and the secondary air inlet are provided with a humidifying and oxygen supplying device, the humidifying and oxygen supplying device comprises a peroxide passage and a steam passage which are communicated with the air inlet. The invention can provide rich-oxygen water steam in the boiler environment to build the necessary conditions for generating rich-oxygen water gas, the tasks of humidification, oxygen supply and the like in site are continuously and stably completed in real time, the rich-oxygen hot water steam environment is created for the combustion of the circulating fluidized boiler, the superior integral conditions of the water-coal-slurry combustion, rich-oxygen combustion and water gas combustion not possessed by the circulating fluidized bed boiler are created, so the heat efficiency of the boiler is improved above the value, and the environment protection effect is obvious.

Description

Technical field: [0001] The invention relates to the technical field of boilers, in particular to circulating fluidized bed boilers. Background technique: [0002] There are currently three mature and advanced combustion technologies for coal-fired boilers in China, namely, coal-water slurry technology, oxygen-enriched combustion technology, and water-gas manufacturing combustion technology. The application effects of these three technologies in actual operation are very ideal. The disadvantage is that the manufacturing equipment is huge and complex, and the capital investment is large. [0003] The application of coal-water slurry technology can replace petroleum and make coal combustion meet environmental protection requirements. It has been recognized by the country and enterprises. Investment, all make enterprises flinch. Since 30% of the water in the coal-water slurry absorbs heat before coal gasification, it has an effect on the combustion process of the coal-water s...

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Problems solved by technology

[0002] There are currently three mature and advanced combustion technologies for coal-fired boilers in China, namely, coal-water slurry technology, oxygen-enriched combustion technology, and water-gas manufacturing combustion technology. The application effects of these three technologies in actual operation are very ideal. The disadvantage is that the manufacturing equipment is huge and complex, and the capital investment is large

[0008] However, the existing circulating fluidized boilers also have certain defects: 1. The thermal efficiency of the boiler is low; since a large part of the heat of the boiler is taken away by a large amount of air distribution, although the combustion rate of coal is high, it is not rich. Oxygen combustion has a high heat utilization rate, so the thermal efficiency of circulating fluidized bed boilers is low; 2. The environmental protection effect is not as good as that of coal water slurry; due to the influence of air coefficient, the carbon monoxide produced after coal combustion and the Residual carbon, too late to be further burned and exhausted with the tail gas, one is to take away part of the heat, and the other is carbon monoxide and residual carbon itself can be further burned to release heat, resulting in waste of energy. The sulfur and carbon monoxide in the exhaust emissions , There are more soot particles, so the effect of desulfurization and nitrogen oxide removal is not as good as that of coal water slurry, which pollutes the environment

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