Method and system for recycling residual heat of ash and slag of liquid slag-tapping boiler

Abstract

The invention discloses a method and a system for recycling the residual heat of ash and slag of a liquid slag-tapping boiler. The method comprises the following steps of by using cold air or partially desulfurized clean smoke gas as a cooling medium, granulating and cooling liquid slag generated by the boiler in a liquid-slag dry-cooling device; sending generated dedusted hot air or hot smoke gas into a flue which is positioned between desulfurizing equipment and a chimney, and mixing and heating the desulfurized clean smoke gas. According to the method, heat in the liquid slag is replaced through the air or the desulfurized smoke gas and is utilized for heating the desulfurized clean smoke gas, so that the heat of the liquid slag can be effectively recycled, the problem of great physical heat loss of the ash and the slag of the liquid slag-tapping boiler is solved, and the economical property of a liquid slag-tapping boiler set is improved. The smoke temperature at the inlet of the chimney is increased by utilizing the residual heat of the liquid slag, so that the chimney can be prevented from being corroded, and the lifting and diffusing capacity of the smoke gas is improved.

Description

technical field [0001] The invention belongs to the field of waste heat recovery and comprehensive utilization, and in particular relates to a method and system for recovery and utilization of ash waste heat of a liquid slag discharge boiler. Background technique [0002] Boilers can be divided into solid slagging boilers and liquid slagging boilers according to the slagging method. In the liquid slag discharge boiler, the ash generated after fuel combustion is discharged in a liquid state. The temperature of the discharged liquid slag is very high, and it must be cooled before it can be comprehensively utilized. At present, most liquid slag discharge boilers use water as the cooling medium to process the liquid slag, that is, the liquid slag is discharged to the granulation through the slag discharge device. In the water tank, the liquid slag is granulated and cooled with slag flushing water, and then the cold slag particles are discharged from the slag removal equipment o...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a method that can effectively recover the heat of liquid slag, and use it to heat the net flue gas after wet desulfurization, so as to solve the problem of large physical heat loss of liquid slag discharge boiler ash and slag, and at the same time utilize the waste heat of slag discharge Method and system for recovering waste heat from liquid slag discharge boilers by increasing the flue temperature at the chimney inlet, preventing chimney corrosion, improving the thermal buoyancy and diffusion capacity of flue gas, and controlling the phenomenon of "gypsum rain"

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