After heat heating system and method for filtering blast furnace slag flushing water by using bottom filter tank

Abstract

The invention provides an after heat heating system and method for filtering blast furnace slag flushing water by using a bottom filter tank, which can solve the problems of low filtering efficiency, poor effect and influence on filtering capacity existing in the prior art. The system comprises a blast furnace slag flushing system, a water filtering tank, a water suction tank, a slurry pump, a heat exchanger, a heating pump, a slag flushing water pump, a back flush water tank and a back flush water pump, wherein the water suction tank is positioned below the water filtering tank and is communicated with the water filtering tank; the tank bottom wall of the water filtering tank is a supporting frame with meshes; the supporting frame is sequentially provided with a granulating slag bottom filter layer and a coble filter layer from top to bottom; and one end of the back flush water pump is communicated with the back flush water tank through a pipeline, and the other end of the back flush water pump is communicated with the water suction tank through a pipeline. By using the system and the method, slag particles and suspended matters are filtered through the granulating slag bottom filter layer and the coble filter layer for many times, the filtration effect is guaranteed, and the filtration efficiency is increased; due to arrangement of the back flush water tank and the back flush water pump, back flush is performed to the water filtering tank in a blast furnace slag flushing gap, and the filtering layer is prevented from being blocked by the slag particles and the suspended matters so as not to influence the filtering capacity.

Description

technical field [0001] The invention belongs to the technical field of waste heat utilization and heating of industrial sewage, and in particular relates to a blast furnace slag flushing waste heat heating system and method for heating the blast furnace slag flushing water by using a bottom filter tank to filter the blast furnace slag flushing water. Background technique [0002] At present, my country generally adopts coal-based central heating and regional boiler heating. Central heating is mainly provided by large-scale thermal power plants or thermal power companies with steam or hot water as a heat source, and heat is supplied to the community through various heat exchange stations. The construction investment is large, the cycle is long, and there is a matching problem between the power load and the heating load, and the heating load is not easy to adjust. Regional boiler heating is mainly provided by the regional boiler room, which requires the construction of boiler...

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Problems solved by technology

[0005] The invention provides a waste heat heating system and method for filtering blast furnace slag flushing water by using a bottom filter tank, which can solve the problems of low filtration efficiency, poor effect, and affecting filtering ability of the existing blast furnace slag flushing water waste heat heating system and method

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