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A method for co-processing coking desulfurization waste liquid, calcium-based solid waste and pollutants in industrial flue gas

A technology for coking desulfurization waste liquid and industrial flue gas, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve problems such as complex process, difficult resource utilization of coking desulfurization waste liquid, and difficult absorption of NO2

Active Publication Date: 2020-09-18
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method extracts cuprous thiocyanate from coking desulfurization waste liquid, which has certain economic benefits, but other components in the coking desulfurization waste liquid have not been treated, and at the same time, the process is complicated, and copper salts need to be added to precipitate thiocyanate Copper, which is costly and creates new waste water
[0007] In view of the above problems, it is urgent to study a new process method, and at the same time solve the problem of NO in the flue gas after ozone oxidation. 2 Difficult to absorb and difficult to resource utilization of coking desulfurization waste liquid

Method used

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  • A method for co-processing coking desulfurization waste liquid, calcium-based solid waste and pollutants in industrial flue gas
  • A method for co-processing coking desulfurization waste liquid, calcium-based solid waste and pollutants in industrial flue gas
  • A method for co-processing coking desulfurization waste liquid, calcium-based solid waste and pollutants in industrial flue gas

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Experimental program
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Effect test

Embodiment 1

[0062]In this embodiment, calcium-based solid waste is selected from steel slag, the mass percentage of ammonium thiocyanate in coking desulfurization waste liquid is 30%, the mass percentage of ammonium thiosulfate is 5%, and the mass percentage of suspended sulfur 5%; NO content in simulated industrial flue gas is 200mg / Nm 3 , SO 2 The content is 4000mg / Nm 3 , Hg 0 The content is 180μg / Nm 3 , the flue gas temperature is 100°C, and the pressure is 1600Pa.

[0063] In this embodiment, the method for co-processing coking desulfurization waste liquid, calcium-based solid waste and pollutants in industrial flue gas includes the following steps:

[0064] (1) Steel slag and process water are mixed according to a solid-to-liquid ratio of 15:1 and stirred for 8 hours, then mixed with coking desulfurization waste liquid, and the pH of the absorbent slurry is controlled to be 8;

[0065] (2) spray ozone into the simulated industrial flue gas, control the molar ratio of ozone to NO...

Embodiment 2

[0070] In this example, calcium-based solid waste is selected from lime mud, the mass percentage of ammonium thiocyanate in the coking desulfurization waste liquid is 1%, the mass percentage of ammonium thiosulfate is 8%, and the mass percentage of suspended sulfur The content is 4%; the NO content in the simulated industrial flue gas is 400mg / Nm 3 , SO 2 The content is 1000mg / Nm 3 , Hg 0 The content is 200μg / Nm 3 , the flue gas temperature is 120°C, and the pressure is 1400Pa.

[0071] In this embodiment, the method for co-processing coking desulfurization waste liquid, calcium-based solid waste and pollutants in industrial flue gas includes the following steps:

[0072] (1) Mix steel slag and process water according to a solid-to-liquid ratio of 5:1, stir for 5 hours, then mix with coking desulfurization waste liquid, and control the pH of the absorbent slurry to 8.5;

[0073] (2) spray ozone into the simulated industrial flue gas, control the molar ratio of ozone to NO...

Embodiment 3

[0078] In this embodiment, calcium-based solid waste is selected from steel slag, the mass percentage of ammonium thiocyanate in coking desulfurization waste liquid is 10%, the mass percentage of ammonium thiosulfate is 12%, and the mass percentage of suspended sulfur 3%; NO content in simulated industrial flue gas is 600mg / Nm 3 , SO 2 The content is 100mg / Nm 3 , Hg 0 The content is 150μg / Nm 3 , the flue gas temperature is 140°C, and the pressure is 1200Pa.

[0079] In this embodiment, the method for co-processing coking desulfurization waste liquid, calcium-based solid waste and pollutants in industrial flue gas includes the following steps:

[0080] (1) Mix steel slag and process water according to the solid-to-liquid ratio of 20:1, stir for 4 hours, then mix with coking desulfurization waste liquid, and control the pH of the absorbent slurry to 6;

[0081] (2) spray ozone into simulated industrial flue gas, control the molar ratio of ozone and NO in the flue gas to be ...

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Abstract

The invention relates to a method for cooperative treatment of coking desulfurizing waste liquid, calcium-based solid waste and pollutants in industrial smoke. The method comprises the following steps: absorbing the oxidized industrial smoke by using absorbent slurry while controlling the pH of the slurry to 6 or higher during the absorption, wherein the absorbent slurry is a mixture of the calcium-based solid waste and the coking desulfurizing waste liquid; after the absorption, discharging the purified smoke, and performing solid-liquid separation on the absorbent slurry; performing impurityremoval and pH regulation on the obtained liquid phase, and heating for decomposition; performing solid-liquid separation to obtain an ammonium thiocyanate product. The method provided by the invention can realize efficient removal of sulfur dioxide, nitrogen oxide and mercury in smoke while recycling an ammonium thiocyanate product with high added value. The method provided by the invention canbe used for performing cooperative treatment on the waste gas, wastewater and waste residue generated in an industrial production process, has the advantages of simple process, low raw material cost and no wastewater discharge in the whole process, realizes cyclic economy of dealing with waste by waste, is suitable for industrial application and creates good economic benefits.

Description

technical field [0001] The invention relates to the technical field of flue gas treatment, in particular to a method for cooperatively treating coking desulfurization waste liquid, calcium-based solid waste and pollutants in industrial flue gas Background technique [0002] Combustion of fossil fuels produces a large number of pollutants (SO 2 , NOx, Hg, VOC, PM, etc.), which are harmful to the environment and human health. The flue gas emitted by my country's non-electric industries (steel, coking, cement, glass, ceramics), due to the low temperature and complex fluctuation of the flue gas, the traditional SCR (Selective Catalytic Reduction) denitrification technology cannot meet the high-efficiency denitrification of nitrogen oxides. remove. The wet desulfurization and SCR denitrification technologies, which are mature in operation in the power industry, deal with a single pollutant, which has the problems of large investment and high operating costs. With the increasing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/80B01D53/50B01D53/56B01D53/64C01C3/20
CPCB01D53/507B01D53/56B01D53/64B01D53/80B01D2251/206B01D2258/0283C01C3/20
Inventor 李会泉孟子衡王兴瑞王晨晔陈艳
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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