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Controlled cascade pyrolysis recovery and dioxin prevention and control method for waste salt in chemical industry

A technology of pyrolysis and industry, applied in the field of secondary pollution control in the process of treatment and disposal, can solve the problems of secondary pollution, etc., achieve the effect of solving corrosion, controllable methods, reducing treatment and disposal costs and environmental risks

Active Publication Date: 2020-06-16
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Purpose of the invention: The purpose of the present invention is to provide a controlled cascade pyrolysis recovery and dioxin prevention and control method for waste salt in the chemical industry. The controlled cascade pyrolysis technology removes organic matter in waste salt in the chemical industry, and can control heat from the source. The harmless and resourceful treatment method of waste salt produced by dioxin in the process of decomposing waste salt can not only efficiently remove organic matter in waste salt, but also realize the harmless and resourceful treatment of hazardous waste such as chemical waste salt. Curb the production of dioxins in waste salt pyrolysis recovery, and solve the problem of secondary pollution caused by pyrolysis

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The waste salt residue precipitated from the three-effect evaporator of a fine chemical company, the waste salt is in the form of light yellow powder lumps, and it has been tested that the waste salt contains 86.5% sodium chloride, 4.6% water, organic matter and other impurities. 20 g of the salt was dissolved in 100 ml of distilled water, and the measured TOC of the solution was 1560 mg / L.

[0041] The method provided by the present invention is used to treat the above-mentioned waste salt. The main process parameters are: the first-stage low-temperature pyrolysis temperature is 150°C, and the pyrolysis time is 0.2 hours; the second-stage pyrolysis temperature is 750°C, and the pyrolysis time is 0.5 hours; The pyrolysis flue gas enters the quenching tower, and the temperature of the flue gas in the quenching tower is controlled at 200°C. The flue gas from a low-temperature pyrolysis furnace and the flue gas at the outlet of the quenching tower are sampled and analyzed f...

Embodiment 2

[0043] The raw materials treated in this example are the same as in Example 1, and the main process parameters of waste salt treatment are changed, specifically: the first stage of low-temperature pyrolysis temperature is 200°C, and the pyrolysis time is 0.2 hours; the second stage of pyrolysis temperature is 800°C, and the pyrolysis time is 0.5 hours Hours; the second-stage pyrolysis flue gas enters the quenching tower, and the temperature of the flue gas in the quenching tower is controlled at 200°C. The flue gas from the first-stage low-temperature pyrolysis furnace and the flue gas at the outlet of the quenching tower are sampled and analyzed for dioxin content. Cool the treated waste salt to room temperature, take 20g of the treated salt and dissolve it in 100ml of distilled water. The TOC of the tested solution is 16mg / L, the removal rate of organic matter is 99%, and the results of flue gas sampling and analysis are all dioxins not detected.

Embodiment 3

[0045] The waste salt of a chemical enterprise is mainly composed of sodium chloride, which is light gray in color, solidified into lumps and slightly viscous. After sampling and analysis, the components are as follows: 90.1% sodium chloride, 7.6% moisture, organic matter and other impurities, 20 g of the salt was dissolved in 100 ml of distilled water at room temperature, and the TOC of the solution was measured to be 5060 mg / L.

[0046] The method provided by the present invention is used to treat the above-mentioned waste salt. The main process parameters are: the first-stage low-temperature pyrolysis temperature is 200°C, and the pyrolysis time is 0.2 hours; the second-stage pyrolysis temperature is 780°C, and the pyrolysis time is 0.5 hours; The pyrolysis flue gas enters the quenching tower, and the temperature of the flue gas in the quenching tower is controlled at 200°C. The flue gas from a low-temperature pyrolysis furnace and the flue gas at the outlet of the quenching...

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Abstract

The invention discloses a controlled cascade pyrolysis recovery and dioxin prevention and control method for waste salt in the chemical industry, and belongs to the field of waste salt treatment and secondary pollution control. The method comprises the following steps that firstly, low-temperature pyrolysis is performed on the waste salt to remove moisture and low-boiling-point organic matters inthe waste salt, and then high-temperature anaerobic pyrolysis is performed, and recovery is performed to obtain organic matter removed salt; meanwhile, pyrolysis waste gas is treated by a waste gas treatment system and is discharged after reaching the standard. According to the controlled cascade pyrolysis recovery and dioxin prevention and control method for waste salt in the chemical industry, the waste salt containing the organic matter is subjected to low-temperature and high-temperature two-stage controlled pyrolysis, high-temperature pyrolysis gas is subjected to quenching, generation ofdioxin and oxidizing gases such as nitrogen oxides and sulfur oxides is effectively avoided, therefore, the purposes that the waste salt is pyrolyzed to remove the organic matter, harmlessness and recycling are achieved, and generation of dioxin is controlled from the source are achieved. The method is high in organic matter removal rate, the generation of dioxin can be controlled from the source, the treatment and disposal cost of the waste salt and the environmental risk are greatly reduced, the method is controllable, and a beneficial path is provided for recycling hazardous wastes such asthe waste salt in the chemical industry.

Description

technical field [0001] The invention belongs to the field of treatment and disposal of waste salt in the chemical industry and secondary pollution control in the process, and specifically relates to a method for controlled cascade pyrolysis recovery and dioxin prevention and control of waste salt in the chemical industry. Background technique [0002] Waste salt is a typical solid waste common in the chemical industry. Waste salt in many industries contains a variety of toxic and harmful organic components, so it is included in the "National Hazardous Waste List". In recent years, cases involving the illegal disposal of waste residue and salt in the chemical industry have occurred frequently, which has aroused widespread concern from all walks of life. In the face of increasingly stringent treatment and disposal requirements and environmental management policies, the treatment and disposal of waste salt in the chemical industry has become one of the problems that need to be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23G7/07F23G5/027F23G5/44F23J15/02F23J15/04F23J15/06
CPCF23G5/027F23G5/44F23G7/07F23J15/025F23J15/04F23J15/06
Inventor 李继洲宋垠先韩孟雨
Owner HOHAI UNIV
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