Slag dredger slag water system based on two-stage circulation and sedimentation and used for supercritical unit

Abstract

The invention relates to a slag dredger slag water system based on two-stage circulation and sedimentation and used for a supercritical unit. Slag water circulates sequentially through industrial water replenishment, a water seal tank, a slag dredger overflow water tank, a first clarification tank, a second clarification tank, a sewage pump and a slag dredger. The modified slag water system operates quite stably, and equipment operates normally. It is learnt from the operating condition of the optimized slag water system that industrial water replenishment is adopted by the optimized slag water system for water replenishment of the water seal tank, the water level of the water seal tank can be maintained, and the requirement for chain flushing carbon-containing pellet water can be met. The temperatures of guide wheels in the slag dredger, a ship body and a slag well are all within the normal working range. The water level of the water seal tank is maintained through industrial water replenishment so that slag accumulation in the water seal tank can be effectively prevented. Calculation shows that the total spare part fee saved by each slag water system is about 100 thousand yuan per year, and the total auxiliary power saved by each slag water system is 331.8 thousand kilowatts per year, namely the fee is saved by about 1.5 million yuan.

Description

technical field [0001] The invention relates to a slag water system of a slag scooping machine based on secondary circulation precipitation of a supercritical unit. Background technique [0002] Overview of prior art equipment [0003] A factory adopts two sets of slag water systems A and B. Under normal operating conditions, one set of slag water systems can be guaranteed to operate normally. The slag water passes through the overflow tank of the slag extractor → clarification pool 1 → clarification pool 2 → buffer pool → slag water circulation pump → self-cleaning filter screen → plate heat exchanger → slag extractor. At the same time, the slag water passes through the clarification tank → sewage pump → slag extraction machine, thus forming a loop. [0004] 1. The failure rate of slag water system equipment is high [0005] Because the coal type contains a large amount of ash, the slag water overflowed from the slag removal machine contains more ash. A large amount of ...

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Problems solved by technology

A large amount of ash settles to the bottom of the clarification tank, and the sewage pump returns the ash to the slag extractor, resulting in frequent blockage of the inlet filter of the sewage pump and greater wear of the impeller of the pump

At the same time, the inlet of the slag water circulation pump is prone to clogging due to slag accumulation, and the rotary filter screen and plate heat exchanger are clogged due to the accumulation of ash slag

[0006] 2. The efficiency of the slag water system is low

[0007] Due to the large amount of slag in the slag water, the sewage pump, slag water circulation pump, plate heat exchanger, and nozzles of the water seal tank are often blocked, and the cooling effect of the slag water becomes poor.

According to daily maintenance statistics, the rotary screen and plate heat exchanger need to be cleaned every half a month, which reduces the utilization rate of the slag water system

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