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Supercritical water oxidation reactor

A supercritical water oxidation and reactor technology, applied in the direction of oxidized water/sewage treatment, etc., can solve the problems of structural corrosion of reaction vessels and other equipment, reactor clogging, corrosion intensification, etc., to prevent inorganic salt deposition, complete reaction, and easy operation stable effect

Inactive Publication Date: 2009-10-14
NANJING UNIV OF TECH
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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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Effect test

Embodiment 1

[0028] Such as figure 1 As shown, the supercritical water oxidation reactor consists 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 0.6 m; The lower part of the reactor cylinder (3) is provided with an oxidant distribution coil (11) made of 316L. The bottom of the reactor cylinder (3) is provided with an electric heating device (12); wherein the top of the reactor is provided with a pressure control valve (5), and the bottom of the reactor is provided with an inorganic salt discharge valve (13). (3) The lower part is provided with the oxidant inlet connection (1) and the waste water inlet connection (2), and the upper part is provided with the clean water outlet connection (6), wherein the oxidant inlet connection (1) and the oxidant distribution coil (11) are connected; the oxidant coil (11) is provided with 4 high 5.8m oxidizer...

Embodiment 2

[0030]When starting, inject a certain amount of ordinary clean water into the reactor with a high-pressure pump, then turn off the high-pressure pump, adjust the pressure control valve (5) to make the pressure in 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 high-pressure liquid oxygen pump, and send the liquid oxygen through the connecting pipe (1), distribute it through the distribution coil (11), and send it into the Reactor, while turning on the waste water pump to inject waste water. Catalytic wastewater with a COD value of 36000mg / L is added to 30MPa by the wastewater 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). With a flow rate of 50kg / h, the pump enters the reactor from the connecting pipe (1) through the distribution coil (11) and enters the reactor from ...

Embodiment 3

[0032] 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 pressure in 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 send it into the reactor from the small hole (9) on the tube (4) , while opening the sludge to inject the sludge. Chemical sludge with a COD value of 80000mg / L is added to 35MPa by a sludge pump, 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). With a flow rate of 140kg / h, the plug pump enters the reactor from the connecting pipe (1) through the distribution coil (11) and enter...

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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 t...

Claims

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Application Information

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IPC IPC(8): C02F1/72
Inventor 廖传华褚旅云李瑞容马雷朱廷风
Owner NANJING UNIV OF TECH
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