Circulating fluidized bed boiler

A circulating fluidized bed and boiler technology, applied in the field of boiler manufacturing, can solve the problems of not being able to effectively reduce NOx emissions, increase the cost of boiler manufacturing and installation, and the heating surface of the superheater of the boiler is huge, so as to increase the cost of manufacturing and installation, and the cost of manufacturing Small, long-lasting effect

CN101943395AInactive Publication Date: 2011-01-12ANHUI JINDING BOILER
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2011-01-12
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Examples

Embodiment Construction

[0022] Structural brief introduction of the present invention:

[0023] The 3 tubes of the high-temperature superheater are arranged above the boiler furnace 1, and the horizontal pitch is evenly arranged according to the depth of the boiler furnace 1. 21 pieces are arranged in parallel, and each piece is connected in parallel with 3 sets, passing through the wall on the top of the membrane water wall. Due to the large radiation heat load in the furnace 1 and the heat that may be generated unevenly, the superheater tube specification adopts φ42×5, and the high-temperature steam flow rate in the design tube is above 24 m / s, and the tube material is selected 12Cr1MoVG / GB5310 (alloy steel pipe) This ensures that the metal wall temperature of the superheater tube is within the allowable value of the material.

[0024] The concentration of solid particles in the flue gas in furnace 1 is relatively high, but the flue gas flow direction is stable, so it is only necessary to add a wea...