Cascade utilization system of flue gas slag waste heat of circulating fluidized bed cogeneration unit

Abstract

The invention belongs to the technical field of circulating fluidized bed cogeneration units, and particularly relates to a cascade utilization system of flue gas slag waste heat of circulating fluidized bed cogeneration unit. The system comprises a slag cooler booster pump, a slag cooler, a low temperature economizer booster pump, a low temperature economizer, a heating network circulating waterpump and a heating network heater. A water inlet of the slag cooler is connected with a water outlet of the slag cooler booster pump. The slag cooler booster pump is connected with a heating network return water pipeline. A water outlet of the slag cooler is connected with the low temperature economizer booster pump. The low temperature economizer booster pump is connected with a water inlet of the low temperature economizer. A water outlet of the low temperature economizer is connected with a heating network supply water pipeline. A water inlet of the heating network heater is connected withthe heating network return water pipeline. A water outlet of the heating network heater is connected with the heating network supply water pipeline. The system solves the problems of difficult distribution of condensate flow in fluidized bed cogeneration units, corrosion of flue gas from low-temperature economizers, and low waste heat utilization of steam turbines. The system can be widely used invarious related cogeneration units' waste heat utilization pipelines.

Description

technical field [0001] The invention belongs to the technical field of circulating fluidized bed heat and power cogeneration units, and in particular relates to a cascade utilization system for flue gas slag waste heat of a circulating fluidized bed cogeneration unit. Background technique [0002] Energy conservation and emission reduction in the urban clean heating industry has always been the focus of national and local planning. Combined heat and power technology realizes the cascade utilization of energy, which is of great significance to the realization of urban clean heating, energy saving and emission reduction. However, for the current large-capacity cogeneration heating units, steam extraction is mainly used for heating, and the grade of steam extraction is relatively high. There is still a part of exhaust steam from the low-pressure cylinder of the steam turbine, and there is a large loss of cold source. The flue gas and slag waste heat on the boiler side of the c...

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Problems solved by technology

[0005] In order to overcome the deficiencies in the prior art, the present invention provides a cascaded utilization system for flue gas and slag waste heat of circulating fluidized bed cogeneration units, which can solve the problem of condensate flow distribution in existing circulating fluidized bed cogeneration units , low-temperature economizer flue gas corrosion, and low utilization rate of steam turbine waste heat

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