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Continuous resource treatment process of high-salt and high-cod chemical hazardous waste based on hydrothermal gasification method

A gasification method and resource utilization technology, applied in water/sewage treatment, water treatment parameter control, heating water/sewage treatment, etc., can solve problems affecting continuous and stable operation, easy to block pipelines, catalyst deactivation, etc., to achieve Good application prospects, improved contact effect, and smaller volume

Active Publication Date: 2022-04-29
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the operation of the current hydrothermal gasification treatment process, due to the high salt content in the hazardous waste, it is easy to block the pipeline, which seriously affects its continuous and stable operation.
In addition, salts in hazardous waste are also easy to deposit on the surface of pyrolysis catalysts, leading to catalyst deactivation.

Method used

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  • Continuous resource treatment process of high-salt and high-cod chemical hazardous waste based on hydrothermal gasification method
  • Continuous resource treatment process of high-salt and high-cod chemical hazardous waste based on hydrothermal gasification method
  • Continuous resource treatment process of high-salt and high-cod chemical hazardous waste based on hydrothermal gasification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Such as figure 1 As shown, a continuous resource treatment process for high-salt and high-COD chemical hazardous waste based on hydrothermal gasification method includes the following steps:

[0051] S1: Start the molten salt furnace system; open the 1# reactor 1 molten salt inlet valve, and heat the molten salt furnace system to 250-300°C; open the 5# reactor 5 molten salt inlet valve, and heat the molten salt furnace system to 350°C ℃±10℃;

[0052] S2: Start the feed pump and open the sewage inlet valve, send a certain amount of sewage into 1# reactor 1, when the pressure in 1# reactor 1 reaches 3-7MPa, open the discharge at the bottom of 1# reactor 1 valve;

[0053] S3: The waste water after pretreatment in 1# reactor 1 becomes a mixture of soda and water, and enters 5# reactor 5;

[0054] S4: The wastewater treated in 5# reactor 5 is under the action of pyrolysis catalyst and high temperature and high pressure. The pyrolysis catalyst is selected from the commerci...

Embodiment 2

[0063] This embodiment is basically the same as Embodiment 1, the difference is that, as Figure 4-8 As shown, the molten salt current-carrying assembly 9 includes a truncated-shaped current-carrying substrate 91, and several guide rings 92 are arranged at equal intervals on the conical slope of the current-carrying substrate 91, and the upper ends of the guide rings 92 are provided with There is a molten salt tank 921 with a semicircular opening, and each diversion ring 92 is provided with a diversion groove 922 longitudinally inside the side wall. To the inside of the current-carrying substrate 91, the outer circumference of the current-carrying substrate 91 is provided with a diversion ring 93 and is connected to the inner wall of the first reactor shell 11 through the diversion ring. The ring 93 is plugged and connected, and the confluence ring 93 is provided with several diversion ports, and the confluence ring 93 is connected with the first molten salt discharge port 14;...

Embodiment 3

[0074] This embodiment is basically the same as Embodiment 1, the difference is that, as Figure 9 As shown, the catalytic carrier plate assembly 10 includes a chassis 101, the middle of the chassis 101 is provided with a heat pipe 102 for molten salt flow, and several groups of fins 103 for heat conduction are distributed in the upper direction of the heat pipe 102, A connecting pipe a104 is provided on the bottom surface of the chassis 101 corresponding to the position of the heat pipe 102. One end of the connecting pipe a104 runs through the chassis 101 and communicates with the heat pipe 102, and the other end thereof is connected to the second molten salt feed port 54. The heat pipe 102 The upper end is provided with a connecting pipe b105 , one end of the connecting pipe b105 communicates with the heat pipe 102 , and the other end of the connecting pipe b105 connects with the second molten salt outlet 53 . The interval angle between two adjacent groups of fins 103 is 60°...

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Abstract

The invention discloses a continuous resource treatment process for high-salt and high-COD chemical hazardous waste based on a hydrothermal gasification method, including S1: starting the molten salt furnace system; S2: sending a certain amount of sewage into the 1# reactor; S3: passing through The wastewater pretreated in 1# reactor becomes a mixture of steam and water, and enters 5# reactor; S4: The wastewater treated in 5# reactor decomposes organic matter under the action of pyrolysis catalyst and high temperature and pressure, and sends it to the material storage tank Recovery of waste heat; S5: After recovery of waste heat, the gas phase of the mixture of supersaturated steam, methane and carbon dioxide enters the gas temporary storage tank, and the condensed water vapor enters the clean water storage tank; S6: With the accumulation of salt in the 1# reactor , When the pressure in the 1# reactor reaches 7MPa, open the 2# reactor for replacement. The present invention utilizes 1#-4# reactor desalination-cleaning cycle operation to ensure continuous and uninterrupted feeding of 5# reactor, and effectively solves the problems of salt deposition blocking pipelines and deactivation of pyrolysis catalysts.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a process for continuous resource treatment of high-salt and high-COD chemical hazardous waste based on a hydrothermal gasification method. Background technique [0002] In recent years, the vigorous development of my country's chemical industry has brought huge economic benefits to the society, but also brought a series of environmental problems. In particular, a large amount of solid, semi-solid or slurry chemical hazardous waste generated in the industrial production process is more prominent. Biological and other toxicity. Therefore, how to effectively deal with these high-salt and high-COD chemical hazardous wastes has become a difficult problem for the green and sustainable development of the chemical industry. [0003] Among the many treatment methods, the hydrothermal gasification method is a technology that uses the special properties of water under high t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/02B01J23/46
CPCC02F1/025B01J23/462C02F2209/08C02F2303/14
Inventor 吕路王林平张炜铭潘丙才徐敬生黄前霖
Owner NANJING UNIV
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