Circulating fluidized bed boiler

Abstract

The invention discloses a circulating fluidized bed boiler which comprises a hearth, a hearth outlet arranged at the upper part of the hearth, a membrane wall arranged in the hearth and a convection flue gas pass connected with the hearth outlet, wherein a high-temperature superheater is arranged in the hearth, the high-temperature superheater is arranged and fixed above the hearth, the high-temperature superheater extends into the hearth, and the extension height is higher than the height of the hearth outlet. The invention can greatly reduce the manufacturing and installation cost of the boiler, and can effectively solve the technical problems that repeated low-temperature burning and desulfuration reaction can not be effectively promoted at the same time, the emission of NOx can not be effectively reduced, etc. At the same time, the invention has the characteristics of small manufacturing cost, high vulcanizing efficiency, long service life and the like.

Description

technical field [0001] The invention belongs to the technical field of boiler manufacture, and in particular relates to a circulating fluidized bed boiler. Background technique [0002] At present, circulating fluidized bed technology is a new generation of high-efficiency, low-pollution and clean combustion technology developed rapidly in the past ten years. The surge movement is strong, not only can achieve low NOx emissions, 90% desulfurization efficiency and combustion efficiency similar to pulverized coal boilers, but also has the advantages of wide fuel adaptability, good load regulation performance, and easy comprehensive utilization of ash. [0003] In the prior art, the heating surface of the high temperature superheater of most circulating fluidized bed boilers on the market is arranged in the tail flue, which brings the following technical defects in the manufacture, installation and use of the boiler: [0004] 1. Adopt the traditional arrangement in the prior ar...

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Problems solved by technology

[0006] The technical problem to be solved by the technical solution provided by the present invention is that, using the traditional arrangement in the prior art, since the circulating fluidized bed boiler itself is low-temperature combustion, the temperature of the flue gas flow to the tail flue is already low (about 600°C) , if you want to obtain superheated steam at a higher temperature (≥400°C) at this time, due to the small temperature and pressure, the heating surface of the superheater of the boiler will be very large, which will greatly increase the manufacturing and installation costs of the boiler; at the same time, it cannot effectively promote , repeated low-temperature combustion and desulfurization reactions, can not effectively reduce technical problems such as NOx emissions, and provide a circulating fluidized bed boiler

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