Bottom slag cooling method of circulating fluidized bed

Abstract

The invention provides a bottom slag cooling method of a circulating fluidized bed, which comprises the specific steps of mounting a slag cooler cavity at the outer side of a conical part at the lower side of a hearth of a circulating fluidized bed boiler; mounting a serpentine heat exchanger at the part between a slag inlet and a slag outlet in the slag cooler cavity, wherein, one end of the serpentine heat exchanger is extended into a primary air chamber and the other end thereof is exposed outside the cavity; putting the bottom slag generated by combustion into the slag cooler cavity through the slag inlet, making the fluidized air of the slag cooler enter the slag cooler cavity from the air chamber of the slag cooler through an air distributor of the slag cooler, and carry fine particles and the desulfurizing agent of the circulating fluidized bed to return to the hearth through a backwind tube, and discharging the cooled bottom slag through the slag outlet. By adopting high-pressure feed water or boiler water of the boiler, the invention cools the bottom slag, realizes heat recovery of the bottom slag, and reduces the floor area of the slag cooler.

Description

technical field [0001] The invention relates to a method for cooling the high-temperature bottom slag of a circulating fluidized bed boiler in combination with air and water, which is used for cooling the bottom slag of the circulating fluidized bed boiler and belongs to the technical field of fluidization of the circulating fluidized bed boiler. Background technique [0002] The bottom slag discharged from the fluidized bed boiler is a solid particle with wide screening (0-30mm) and high temperature (~900°C), which is a material that is difficult to operate and control, especially for large capacity (or large amount of slag) For CFB boilers, there is no good solution both at home and abroad. Therefore, the slag cooler is one of the most difficult technical difficulties in the auxiliary system of the fluidized bed boiler. The fluidized bed slag cooler introduced in China has problems such as slagging, failure of boiler slag discharge control, and wear of the cooling and hea...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of slag blockage, wear, and difficult replacement of the heating surface of the existing air-water combined circulation fluidized bed slag cooler, and to propose a bottom that is suitable for the fluidized bed to burn fuels such as high ash content and low calorific value. Slag Cooling Method

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