Supercritical water oxidation reactor and method for processing waste water

A technology of supercritical water oxidation and reactor, which is applied in the direction of oxidized water/sewage treatment, etc., to achieve stable operation, increase conversion rate, and save consumption

Inactive Publication Date: 2011-11-16
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]Due to the low solubility of salt in supercritical water, a large amount of precipitation occurs during the reaction process, and the deposited salt will cause reactor blockage
At the same time, the supercritical water oxidation reaction usually occurs under high temperature and high pressure conditions, and the corrosion of the reaction vessel and other equipment structures is extremely serious, especially when there are Cl, Br, F and other halogen elements in the reactant stream, as well as S, P and other elements. more exacerbated

Method used

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  • Supercritical water oxidation reactor and method for processing waste water
  • Supercritical water oxidation reactor and method for processing waste water
  • Supercritical water oxidation reactor and method for processing waste water

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Experimental program
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Embodiment 1

[0032] Such as figure 1 As shown, the supercritical water oxidation reactor is composed of a reactor cylinder 3, an oxidant distribution coil 11 and an electric heating device 12; wherein the material of the reactor cylinder is 316L, the height is 6m, and the inner diameter is 0.6m; the reactor cylinder The lower part of 3 is provided with oxidant distribution coil 11, and the material is 316L. The bottom of the reactor cylinder 3 is provided with an electric heating device 12; the top of the reactor is provided with a pressure control valve 5, the bottom of the reactor is provided with an inorganic salt discharge valve 13, and the lower part of the reactor cylinder 3 is provided with an oxidant inlet connecting pipe 1 And the waste water inlet connection pipe 2, the upper part is provided with the clean water outlet connection pipe 6, wherein the oxidant inlet connection pipe 1 is connected with the oxidant distribution coil 11; the oxidant distribution coil 11 is provided w...

Embodiment 2

[0034]When starting, first inject a certain amount of ordinary clear water into the reactor with a high-pressure pump, then close the high-pressure pump, adjust the pressure control valve 5 to make the pressure (30MPa) in the reactor reach the process requirement, and use the heater 12 to heat. When the pressure reaches 30MPa and the temperature reaches 400°C, turn on the high-pressure liquid oxygen pump, pass the liquid oxygen through the connecting pipe 1, distribute it through the distribution coil 11, and then send it into the reactor from the small hole 9 on the tube 4, and turn on the waste water pump to inject waste water. The catalytic waste water with a COD value of 36000mg / L is added to 30MPa by the waste water pump, then enters the reactor through the connecting pipe 2 at a flow rate of 0.25t / h, and is heated to 400°C by the heater 12, and the liquid oxygen is supplied by the high-pressure liquid oxygen pump at 50kg / h The flow of h is distributed from the connecting...

Embodiment 3

[0036] When starting, first inject a certain amount of ordinary clean water into the reactor with the sludge pump, then close the sludge pump, adjust the pressure control valve 5 to make the reactor reach the pressure (30MPa) required by the process, and use the heater 12 to heat. When the pressure reaches 30MPa and the temperature reaches 400°C, turn on the hydrogen peroxide high-pressure pump, pass the hydrogen peroxide through the connecting pipe 1, distribute it through the distribution coil 11, and then send it into the reactor from the small hole 9 on the tube 4, and at the same time open the sludge and inject the sludge . The chemical sludge with a COD value of 80000mg / L is fed to 35MPa by the sludge pump, and then enters the reactor through the connecting pipe 2 at a flow rate of 0.5t / h, and is heated to 460°C by the heater 12. The flow rate per hour is distributed by the connecting pipe 1 through the distribution coil 11, and then enters the reactor from the small hol...

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Abstract

The invention relates to a supercritical water oxidation reactor which consists of a reactor cylinder body (3), an oxidant distribution coil (11) and a heating device (12); the oxidant distribution coil (11) is arranged at the lower part of the reactor cylinder body (3), the heating device (12) is arranged at the bottom part of the reactor (3); wherein a pressure control valve (5) is arranged at the top part of the reactor cylinder body (3), an inorganic salt discharge valve (13) is arranged at the bottom part of the reactor cylinder body (3), an oxidant inlet connection tube (1) and a waste water inlet connection pipe (2) are arranged at the lower part of the reactor cylinder body (3), a clean water outlet connection pipe (6) is arranged at the upper part, wherein the oxidant inlet connection tube (1) is communicated with the oxidant distribution coil (11); and an oxidant tubearray (4) is arranged on the oxidant distribution coil (11). The supercritical water oxidation reactor integrates the reaction process and the separation process to a whole body, thereby having simple equipment structure, stable operation, low investment and maintenance cost, great liquid retention and ability of effectively preventing the deposition of inorganic salts.

Description

technical field [0001] The invention relates to a high-temperature and high-pressure reactor, more specifically, a reactor for treating high-concentration refractory waste water or sludge with a large content of inorganic salts by using a supercritical water oxidation method. Background technique [0002] Supercritical water oxidation (SCWO) mainly uses supercritical water (T>373.85°C, P>22.1MPa) as the medium to oxidize and decompose organic matter, and can remove carbon, carbon, and Hydrogen is completely converted to CO 2 and H 2 O, converts nitrogen into N 2 or N 2 O and other harmless substances oxidize phosphorus, chlorine, sulfur and other elements in the water body, and deposit them from supercritical water in the form of inorganic salts. This is a deep oxidation method that can completely destroy the structure of organic matter. Its removal rate of general organic matter in wastewater can reach more than 99.9%. [0003] Among them, the reaction stage is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/72
Inventor 廖传华褚旅云李瑞容马雷朱廷风
Owner NANJING TECH UNIV
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