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Process for waste oxidation treatment and steam co-production by using supercritical circulating water

A technology for oxidative treatment and circulating water, which is applied in the fields of environmental protection and chemical industry to achieve the effect of solving the danger, improving the service life and having good fluidity.

Active Publication Date: 2014-02-05
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007]Aiming at many problems faced by supercritical water treatment at present, the present invention provides a wastewater treatment process, which is a cogeneration system of wastewater and steam to solve At present, the energy utilization rate of waste water treatment is low, the equipment is corroded seriously, and the blockage of inorganic salts reduces the corrosion of waste water to pipelines, gets rid of relying on electric heating for waste water, and can change different process conditions to achieve mixed centralized treatment of different types of sewage , solved a series of technical problems that need to be overcome, and made substantial progress in the industrial application of supercritical water oxidation technology

Method used

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  • Process for waste oxidation treatment and steam co-production by using supercritical circulating water
  • Process for waste oxidation treatment and steam co-production by using supercritical circulating water

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Embodiment 1

[0036] See attached figure 1 , A supercritical circulating water oxidation treatment waste and steam co-production process. The supercritical circulating water oxidation treatment system includes a heating device, a reactor, a steam generator and a gas-liquid separation device, a heating device, a reactor, a steam generator and a gas The liquid separation device is connected end to end in sequence through pipelines to form a circulating treatment system. The process includes the following steps:

[0037] Step 1 heating step

[0038] The heating furnace is filled with circulating water, and the heating furnace is turned on to heat the circulating water. The heated circulating water overflows through the pipeline to the reactor and other follow-up equipment to promote circulation in the circulating water system, heating to 395°C-450°C, and the pressure to Greater than 22.1Mpa;

[0039] Step 2 reaction step

[0040] The sewage and oxidant are fed into the reactor at the same time, and ...

Embodiment 2

[0048] See attached figure 2 , A supercritical circulating water oxidation treatment waste and steam cogeneration process, including the following steps:

[0049] Step 1 Inject the circulating water into the heating furnace through the power circulation device, and fill the subsequent equipment and pipelines until the pressure relief device is separated. After the circulating water fills the heating furnace, close the circulating water inlet valve, stop the injection, and heat the water in the heating furnace , Raise the temperature to 395℃-450℃; during the heating process, the circulating water will flow into the next equipment due to the increase in temperature and the decrease in density, which will cause a part of the water to overflow in the separation pressure relief device during the heating process. It flows out from the orifice, and the pressure of the entire pipeline device will increase to the discharge pressure set by the device (at least greater than 22.1Mpa); durin...

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Abstract

The invention provides a process for waste oxidation treatment and steam co-production by using supercritical circulating water. A treatment system is a circulating treatment system. The process comprises the steps of filling circulating water into a supercritical circulating water oxidation treatment system, heating the circulating water in a heating device, driving the circulating water to circularly operate in the system, and controlling the temperature to be raised to 395-450 DEG C and the pressure to be higher than 22.1Mpa; inputting sewage and an oxidizing agent to a reactor, and enabling the sewage and the oxidizing agent to react in a supercritical state; enabling the water after reacting to enter a steam generator for heat recovery, and outputting steam; carrying out gas-liquid separation on the water subjected to heat exchange through the steam generator, and discharging inorganic salt gas and a part of water; inputting the other part of water after gas-liquid separation as the circulating water to the heating device. In the process, the sewage is up to the supercritical state through being mixed with the circulating water, a sewage preheating device in traditional sewage treatment is omitted, and the sewage with a high-concentration COD (Chemical Oxygen Demand) value can be directly treated.

Description

Technical field: [0001] The invention belongs to the fields of environmental protection and chemical industry, and in particular relates to a technology for harmless treatment of refractory waste water and waste residue by using supercritical water, which is combined with a steam cogeneration treatment system. Background technique: [0002] At present, the industry is developing rapidly, and the accompanying pollution is becoming more and more serious. The treatment of many industrial waste water and waste gas has also become a problem. Some factories will dilute the diluted waste water to the national standard and then discharge it. Components, some wastewater is treated by blending combustion and oxidation, and secondary pollution will occur due to insufficient combustion. Most high-concentration wastewater is difficult to completely treat due to its complex composition, such as papermaking, printing and dyeing wastewater treatment decolorization, azo-based The degradati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72F22B1/16
Inventor 张阔廖传华李智超朱跃钊陈海军范红途
Owner NANJING TECH UNIV
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