Circulating fluid bed unit anti-dry burning and water level adjusting device and control method therefor

Abstract

The invention discloses a circulating fluid bed unit anti-dry burning and water level adjusting device and a control method therefor. The device comprises a condenser, a steam seal cooler, a slag cooler, a low-temperature coal economizer, a first low-pressure heater, a second low-pressure heater, a third low-pressure heater and a deaerator, wherein the condenser is arranged at the starting end ofa condensed water pipeline, the deaerator is arranged at the tail end of the condensed water pipeline, and the steam seal cooler, the slag cooler, the low-temperature coal economizer, the first low-pressure heater, the second low-pressure heater, and the third low-pressure heater are sequentially arranged on the condensed water pipeline. A condensed water recycling pipeline is arranged behind thefirst low-pressure heater, and the pipeline is a system pipeline for preventing dry burning of the slag cooler; a pipeline to the condenser is arranged on a backwater pipeline behind the slag cooler,and the pipeline is a system pipeline for deaerator water level adjusting; and according to the device, the water level of the deaerator can be adjusted, cooling water for the slag cooler of a circulating fluid bed can also be provided so that the circulating fluid bed can stably operate even under the working conditions with condensed water.

Description

technical field [0001] The invention belongs to the technical field of circulating fluidized bed unit operation, and in particular relates to an anti-dry burning and water level regulating device for a circulating fluidized bed unit. Background technique [0002] In order to speed up energy technology innovation, consume low-quality coal, protect the environment, and save energy, large and medium-sized thermal power units use circulating fluidized bed units. The biggest feature of the circulating fluidized bed is that the boiler has a large heat capacity. Once it is shut down or the steam turbine cannot provide cooling water due to various reasons, the boiler cannot be cooled. When the boiler is in a dry burning state, it is unfavorable to the normal operation of the boiler. The slag temperature of circulating fluidized bed boiler reaches 800~900℃ under normal conditions. Such high hot slag cannot be discharged normally through cooling water cooling, which will increase the...

AI Technical Summary

Problems solved by technology

Even if the recirculation regulating valve is fully opened, the operation of the minimum flow safety valve of the condensate pump cannot be guaranteed, and the minimum flow required by the slag cooler cannot be guaranteed

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