A startup system and method based on supercritical water oxidation technology
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A supercritical water oxidation technology, which is applied in chemical instruments and methods, sludge oxidation treatment, oxidized water/sewage treatment, etc., can solve problems such as salt deposition, blockage, and coking of electric heaters, and reduce operating costs. The effect of saving power loss and reducing start-up time
Active Publication Date: 2021-02-02
XI AN JIAOTONG UNIV
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[0009] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art, and provide a start-up system and method based on supercritical water oxidation technology, which can effectively solve the problem of system start-up when high-salt or solid-containing organic waste is treated with a supercritical water oxidation system. And problems such as coking, salt deposition and blockage of electric heaters during normal operation can improve the safety and reliability of the system
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Embodiment 1
[0053] see figure 1 , this embodiment takes supercritical water oxidation technology to treat industrial sludge as an example, and describes the start-up scheme of supercritical water oxidation system in detail:
[0054] The start-up system based on the supercritical water oxidation technology of the present invention includes a material pretreatment unit, an oxygen supply unit, a water supply unit, a fuel supply unit, a supercritical water oxidation reaction and a postprocessing unit. The connection method of each device is as follows:
[0055] The outlet of the material mixing tank 5 is connected to the inlet of the high-pressure material pump 6, the outlet of the high-pressure material pump 6 is connected to the inlet of the inner pipe of the preheater 7, and the outlet of the inner pipe of the preheater 7 is connected to the inlet of the second electric heater 8 , the outlet of the second electric heater 8 is connected with the inlet of the supercritical water oxidation r...
Embodiment 2
[0074] Such as figure 2As shown, the start-up system based on the supercritical water oxidation technology in this embodiment includes a material pretreatment unit, an oxygen supply unit, a water supply unit, a fuel supply unit, a supercritical water oxidation reaction and a post-treatment unit.
[0075] The difference with Example 1 is:
[0076] The fuel supply unit includes a fuel storage tank 11 , a fuel metering pump 12 and a mixer 13 . The outlet of fuel storage tank 11 is connected with the inlet of fuel metering pump 12 , the outlet of fuel metering pump 12 is connected with the inlet of mixer 13 , and the outlet of mixer 13 is connected with the inlet of high-pressure material pump 6 .
[0077] The water supply unit includes a water storage tank 1 , a starting feed water pump 2 , a first electric heater 3 , a water distribution tank 4 , and a constant pressure device 17 . The outlet of the water storage tank 1 is connected to the inlet of the starting feed water pum...
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Abstract
The invention discloses a start-up system and method based on supercritical water oxidation technology, comprising a material pretreatment unit, an oxygen supply unit, a water supply unit, a fuel supply unit, a supercritical water oxidation reaction and a postprocessing unit. By adopting a small flow start-up during the start-up process of the supercritical water oxidation system, the power of the electric heater required for the heating process of the system is reduced. At the same time, in the process of system start-up, firstly switch the alcohol fuel with the same material concentration as that in normal operation to make the system reach a stable operating state, and bypass the electric heater, then switch the material to be processed to make it pass through the bypass, and through the regulation The concentration of alcohol fuel is added to control the reaction temperature, which not only avoids the problems of coking, carbon deposition, salt crystallization and deposition, and solid particle deposition when the material directly passes through the electric heater, which eventually leads to the blockage of the electric heating tube, but also the addition of alcohol can A co-oxidation reaction with the material strengthens the supercritical water oxidation degradation effect of the material.
Description
【Technical field】 [0001] The invention belongs to the technical field of chemical industry and environmental protection, and relates to a starting system and method based on supercritical water oxidation technology. 【Background technique】 [0002] At present, the hazardous waste produced by the highly polluting chemical industry is corrosive, toxic, flammable, reactive or infectious. According to incomplete statistics, in 2016, the output of hazardous waste reached 53.47 million tons, and 11.53 million tons are still in storage , in fact, in order to avoid the high cost of hazardous waste treatment, enterprises concealed their output. The actual output of hazardous waste exceeded 80 million tons, while the actual treatment rate of hazardous waste enterprises was only 25%. Wastewater and sludge caused by hazardous waste in the environment contain difficult-to-degrade halogens, sulfur and nitrogen, heavy metals, and aliphatic and aromatic pollutants. If they are not treated ef...
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