CFB boiler emergency water supplementing system without emergency water supplementing box

Abstract

The invention provides a CFB boiler emergency water supplementing system without an emergency water supplementing box. The CFB boiler emergency water supplementing system comprises a chemical water desalting water tank and an emergency water supplementing pump. A water outlet and a water return port are formed in the chemical water desalting water tank. The water outlet of the chemical water desalting water tank is connected with a water inlet of the emergency water supplementing pump through a pipeline. A water outlet of the emergency water supplementing pump is sequentially connected with a recirculation port of a self-reliance minimum flow regulating valve and the water return port of the chemical water desalting water tank through pipelines. A water outlet of the self-reliance minimum flow regulating valve is connected with a boiler high-pressure water supply pipeline through a pipeline. When a boiler water supply system is interrupted, it can be guaranteed that the heated face of a boiler is effectively protected through cooling water supplied by the emergency water supplementing system in time, arrangement of the independent emergency water supplementing box is avoided, construction cost and operation cost of the boiler are saved, the problem that the emergency water supplementing function can not be achieved when the emergency water supplementing box is maintained regularly is solved, and the CFB boiler emergency water supplementing system has the prominent advantages of being reliable in water supplementation, environmentally friendly, capable of saving water and the like.

Description

technical field [0001] The invention relates to the technical field of CFB boilers, in particular to an emergency water supply system for a CFB boiler without an emergency water supply tank. Background technique [0002] CFB (English full name Circulating Fluidized-bed Boiler, circulating fluidized bed boiler) boiler has many advantages such as wide fuel adaptability, high combustion efficiency, large load adjustment, direct desulfurization in the bed, and easy comprehensive utilization of ash. It is widely used in production steam, heat supply, combined heat and power generation, and power plant boilers. For CFB boilers, after the water supply is interrupted, due to the large amount of heat storage of the bed material and refractory materials in the furnace, the working medium in the furnace will be continuously heated, and a large amount of steam will be discharged to the atmosphere through the safety valve or enter the condenser through the steam turbine bypass. However,...

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Problems solved by technology

During the regular maintenance of the emergency water tank or the water supply system of the emergency water tank fails, for example, when the desalinated water pump unit fails, if the water supply system of the CFB boiler fails or is interrupted and other abnormal conditions occur, and the emergency water system cannot perform normal water replenishment, As a result, it is easy to cause the heating surface of the boiler to not receive timely and effective cooling water protection

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