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

Inactive Publication Date: 2011-01-12
ANHUI JINDING BOILER
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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 t

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  • Circulating fluidized bed boiler
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Example Embodiment

[0022] Brief introduction of the structure of the present invention:

[0023] The high-temperature superheater 3 tubes are arranged above the boiler furnace 1, and the horizontal pitch is evenly arranged according to the depth of the boiler furnace 1, with 3 sets of each in parallel, passing through the wall on the top of the membrane water wall. Due to the large radiant heat load in the furnace 1 and the possible uneven heat generation, the superheater tube size is φ42×5, and the high-temperature steam flow rate in the design tube is above 24 m / s. In addition, the tube material is 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 the furnace 1 is relatively high, but the flue gas flow direction is stable, so it is only necessary to add a wear shield at the elbow of the lower pipe. The wear shield is formed by welding...

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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.

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...

Claims

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Application Information

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IPC IPC(8): F22B31/08F22G7/00F23C10/18
Inventor 黄兴华周勇朱才林钱路张建举
Owner ANHUI JINDING BOILER
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