Cyclic deslagging system

Abstract

The invention discloses a cyclic deslagging system which comprises a submerged chain conveyor (1). The cyclic deslagging system further comprises an overflow water tank (4) and cooling devices (5), wherein the overflow water tank (4) is connected with the submerged chain conveyor (1) and used for receiving overflow water of the submerged chain conveyor (1); the cooling devices (5) are connected with the overflow water tank (4) and used for cooling clear water obtained after sedimentation in the overflow water tank (4) and feeding the cooled clear water into the submerged chain conveyor (1); sewage pumps (7) are also arranged between the overflow water tank (4) and the submerged chain conveyor (1) and used for discharging sedimentary sewage in the overflow water tank (4) to the submerged chain conveyor (1). The cyclic deslagging system can achieve zero emission of slag water and is simple in structure, convenient to maintain and safe and reliable in operation.

Description

technical field [0001] The invention relates to a slag removal technology of a boiler, in particular to a circulating slag removal system. Background technique [0002] In thermal power plants, the slag produced by the combustion of the boiler falls from the furnace through the slag well to the tank of the water-filled slag machine, and is then pulled out by the scraper of the slag machine and sent to the slag bin. Cooling, the slag water in the slag removal machine has been in an overflow state. [0003] With the enhancement of water-saving awareness, in order to reduce the waste of water resources, for the power plants adopting the water-cooled slag removal system, it is required that the slag water system must adopt a closed cycle with zero external discharge. [0004] At present, the closed slag water circulation system of the domestic water-cooled slag removal system mainly has three ways: one is that the slag water is precipitated by a high-efficiency thickener, coole...

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Problems solved by technology

[0005] However, in the first treatment method, the system still discharges a certain amount of sewage to the outside, resulting in an increase in water replenishment in the system, a decrease in the reuse rate of slag water, and the discharged sewage needs to be treated for secondary sewage. If it is not treated in time, it will be easy It leads to fouling of the slag water system, high power consumption in operation, and high initial investment cost; the second treatment method, the system using a dosing flocculation purification device, has a large initial investment, and the system is more complicated and the maintenance workload is larger; The third treatment method is relatively simple. The slag scraper keeps the water level normal and does not overflow. Occasionally, when it overflows, the slag water enters the overflow pool and is intermittently discharged to the unit drainage tank or waste water treatment center. The initial investment is low and the operating power consumption is low. However, power plant operators are worried that the amount of coke slag dropped by the boiler will increase or that the water temperature of the slag extractor will rise sharply when the ambient temperature is high in summer, which may lead to the safe operation of the slag extractor. It has not been widely used yet.

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