Method and system for preparing soft water and utilizing afterheat by using spent steam obtained through ironmaking blast furnace slag washing

A technology of ironmaking blast furnace and slag flushing, which is applied in the field of waste heat utilization, can solve the problems of fast scaling of heat exchangers and pipes, poor heating effect, etc., achieve the effects of reducing dust emissions, reducing the amount of recycled wastewater, and improving the quality of effluent water

Inactive Publication Date: 2012-07-11
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Application Information

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Problems solved by technology

When the slag flushing water is circulated for heating, not only the heat exchanger and pi...

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  • Method and system for preparing soft water and utilizing afterheat by using spent steam obtained through ironmaking blast furnace slag washing
  • Method and system for preparing soft water and utilizing afterheat by using spent steam obtained through ironmaking blast furnace slag washing

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Embodiment Construction

[0012] The present invention is described in detail below in conjunction with accompanying drawing.

[0013] Such as figure 1 As shown, the present invention is a system for preparing soft water from slag flushing waste steam of ironmaking blast furnace and utilizing waste heat. It is composed of three parts: water quenching cycle slag flushing device, waste steam purification device and water production device. The main structure and function of each part are introduced. as follows:

[0014] Part 1: Water quenching cycle slag flushing device

[0015] The high temperature slag ditch 3 is set above the inlet of the slag flushing tank 4, and the outlet pipe from the slag flushing water circulation pump 2 is connected directly below the outlet of the high temperature slag ditch 3, so that the discharged high temperature slag is dispersed by the high-speed water flow below and cooled rapidly granulation, the slag water falls into the slag washing tank 4; the slag washing tank 4 ...

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Abstract

The invention provides a method and a system for preparing soft water and utilizing afterheat by using spent steam obtained through ironmaking blast furnace slag washing. In the method, slag at high temperature of 1,500DEG C is subjected to water quenching, slag-washing water instantaneously absorbs a great deal of latent heat of vaporization, and is evaporated to form slag-washing spent steam which contains low salt content and is rich in the latent heat of vaporization; the spent steam is subjected to condensation heat transfer to prepare the soft water or demineralized water, and low-grade latent heat of vaporization is brought to terminal users such as boilers and the like through the soft water or the demineralized water; meanwhile, the spent steam is purified to reduce dust pollution. The system for implementing the method comprises a water quenching circular slag-washing device, a spent steam purifier and a water making device. The invention has the advantages that: the spent steam is prepared into the soft water or the demineralized water at low cost and light pollution, the afterheat of the spent steam is recovered, the emission of slag-washing dust and the visual pollution of the spent steam are greatly reduced, and the comprehensive benefit is obvious.

Description

technical field [0001] The invention belongs to the technical field of waste heat utilization, and in particular relates to a method and system for utilizing waste heat of ironmaking blast furnace slag flushing waste steam. Background technique [0002] In the production of the iron and steel industry, a large amount of high-temperature slag at about 1500 ° C is discharged from the iron-making blast furnace, which contains a large amount of high-temperature sensible heat, and is granulated into water slag under the impact of 6 to 8 times the water. The water is heated, and a large amount of low-temperature and low-pressure waste steam is produced, which entrains a certain amount of dust and discharges into the air, polluting the atmospheric environment, and its water mist also forms visual pollution. The exhaust steam continuously condenses into water droplets and scatter on the nearby equipment and pipelines during the rising process. The entrained dust and dissolved acid g...

Claims

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Application Information

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IPC IPC(8): C02F9/10B01D46/10B01D5/00C21B3/08
CPCC21B2400/024C21B2400/08
Inventor 张新喜张森淼潘芳慧
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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