Zero discharge treatment process of saline sewage produced by refining

A treatment process and zero-emission technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve problems such as reducing fresh steam consumption, and meet long-term operation and failure The effect of low efficiency and high energy efficiency

Inactive Publication Date: 2014-07-23
田晓良
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] Mechanical recompression evaporator overview Steam mechanical recompression evaporator is referred to as MVR. Compared with traditional multi-effect evaporation, MVR energy efficiency is equivalent to four-effect evaporation. It is a new type of high-efficiency evaporation equipment developed in the late 1990s in the world. Its working principle is that after the secondary steam generated by the evaporator is acted on by a mechanical heat energy compressor, the temperature rises by 5-15°C and returns to the heating heat source for the evaporator. The fresh steam is only used to sup

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  • Zero discharge treatment process of saline sewage produced by refining
  • Zero discharge treatment process of saline sewage produced by refining
  • Zero discharge treatment process of saline sewage produced by refining

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[0019] In order to make the present invention more comprehensible, a preferred embodiment is described below in detail with the accompanying drawings.

[0020] The zero-discharge treatment process for refining and chemical salty wastewater provided by the present invention includes the following 3 steps:

[0021] Step 1: Combine figure 1 , The salty sewage from the flue gas desulfurization PTU (waste liquid treatment unit) part, the salt contained in it is sodium sulfite or ammonium sulfate, and the mass concentration is 7.5%-20%. It is filtered through a fiber filter to remove most of the solid particles. , And then pass through the secondary fine filter of the fine filter, the filtration accuracy is 1-15 microns, and the solid particles in the water after filtration are less than 2mg / L.

[0022] Step 2: Combine figure 2 , The salty sewage after the fine filtration passes through the plate heat exchanger 1 to exchange heat with the recovered condensed water, enters the degassing ta...

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Abstract

The invention provides a zero discharge treatment process of saline sewage produced by refining. The treating process comprises the steps that saline sewage produced by flue gas desulfurization is conveyed to an evaporation chamber after undergoing two-stage filtration and heat exchange, evaporated steam is mixed with fresh steam after being pressurized and the steam mixture enters the shell pass of a heater to be condensed and discharged; saline water in the tube pass of the heater is heated to be evaporated and crystallized in the heater, the steam enters a compressor and salt crystals are deposited in a salt leg at the bottom of the evaporation chamber and are swirled and centrifugally concentrated; salt crystal filter cakes are dried in a drying machine, moisture is volatilized and is discharged from the top of the drying machine, gases pass through a two-stage cyclone separator to separate salt solid particles and the salt solid particles are emptied by a drying draught fan, and the salt solid after dehydration and drying is packaged to prepare sodium sulfite or ammonium sulfate products. The process provided by the invention has the effects of overcoming the defects of the prior art, really achieving zero discharge treatment of sewage and producing sodium sulfite or ammonium sulfate with economic value and has the beneficial effects of high energy efficiency, low investment, short flow, small floor area, low failure rate and satisfaction of long period operation.

Description

technical field [0001] The invention relates to a process for implementing "zero discharge" treatment of high-salt flue gas desulfurization sewage produced by petrochemical and coal chemical enterprises, and producing economically valuable sodium sulfite or ammonium sulfate, which belongs to the technical field of sewage treatment engineering. Background technique [0002] At present, with the improvement of environmental protection requirements of petrochemical and coal chemical enterprises, flue gas desulfurization facilities have been put into use one after another. Concentrated brine with a mass concentration of about 7.5% sodium sulfate produced by flue gas desulfurization is generally mixed into sewage treatment plants after clarification and oxidation. Straight discharge after the exit monitoring pool; for many inland petrochemical plants and coal chemical plants, without setting up evaporation ponds, a large amount of high-salt sewage is continuously discharged outsid...

Claims

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Application Information

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IPC IPC(8): C02F9/10
Inventor 田晓良
Owner 田晓良
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