CN117602701A - System and method for treating high-salt organic waste liquid by plasma bottom blowing and recycling - Google Patents
System and method for treating high-salt organic waste liquid by plasma bottom blowing and recycling Download PDFInfo
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- 239000007788 liquid Substances 0.000 title claims abstract description 115
- 239000010815 organic waste Substances 0.000 title claims abstract description 79
- 238000004064 recycling Methods 0.000 title claims description 44
- 238000007664 blowing Methods 0.000 title claims description 38
- 238000000034 method Methods 0.000 title claims description 24
- 238000006243 chemical reaction Methods 0.000 claims abstract description 158
- 150000003839 salts Chemical class 0.000 claims abstract description 107
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 56
- 239000003546 flue gas Substances 0.000 claims abstract description 56
- 229910017053 inorganic salt Inorganic materials 0.000 claims abstract description 27
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000009826 distribution Methods 0.000 claims abstract description 13
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 11
- 238000009833 condensation Methods 0.000 claims abstract description 8
- 230000005494 condensation Effects 0.000 claims abstract description 8
- 238000002425 crystallisation Methods 0.000 claims abstract description 8
- 230000008025 crystallization Effects 0.000 claims abstract description 8
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 7
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 7
- 238000007789 sealing Methods 0.000 claims abstract description 7
- 238000001723 curing Methods 0.000 claims description 55
- 239000007789 gas Substances 0.000 claims description 52
- 239000002826 coolant Substances 0.000 claims description 48
- 238000000926 separation method Methods 0.000 claims description 39
- 239000002893 slag Substances 0.000 claims description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 34
- 229910001868 water Inorganic materials 0.000 claims description 23
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 20
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 20
- 238000007599 discharging Methods 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 229910052760 oxygen Inorganic materials 0.000 claims description 10
- 239000001301 oxygen Substances 0.000 claims description 10
- 235000011164 potassium chloride Nutrition 0.000 claims description 10
- 239000001103 potassium chloride Substances 0.000 claims description 10
- 239000011780 sodium chloride Substances 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000012535 impurity Substances 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 239000011261 inert gas Substances 0.000 claims description 8
- 229910001504 inorganic chloride Inorganic materials 0.000 claims description 6
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- 239000011819 refractory material Substances 0.000 claims description 6
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- 238000005260 corrosion Methods 0.000 description 3
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/04—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste liquors, e.g. sulfite liquors
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
Abstract
In the system, a reaction tank body accommodates the high-salt organic waste liquid, a plasma generator is arranged at the bottom of the reaction tank body to provide a heat source, a nozzle of the plasma generator extends into the reaction tank body in a sealing way through a through hole, the extending length of the nozzle from the bottom of the reaction tank body is 5 cm to 10cm, a flue gas outlet is arranged at the top of the reaction tank body to lead out flue gas, and the flue gas comprises gaseous inorganic salt, carbon dioxide and vapor; the plurality of curing plates are distributed along the extending direction of the salt separating flow channel to exchange the heat of the flue gas in the salt separating flow channel, the curing plates are hollow structures attached to the salt separating flow channel, and the air inlet flow can controllably flow normal-temperature air to the plurality of curing plates to adjust the temperature distribution of the plurality of curing plates, so that the plurality of curing plates respectively cure and deposit the gaseous inorganic salt in the flue gas according to the condensation crystallization curing temperature of the inorganic salt. The system can solve the problems of organic matters, inorganic salts and heavy metals in the waste liquid at one time.
Description
Technical Field
The invention relates to the technical field of high-salt organic waste liquid treatment, in particular to a system and a method for treating high-salt organic waste liquid by plasma bottom blowing and recycling.
Background
The high-salt organic waste liquid refers to discharged waste liquid with the total salt content of more than 1 percent. The water is widely available, large in water quantity, high in organic matter concentration, large in chromaticity and high in salt content, and can be produced in a large amount in various industrial production such as pharmacy, chemical industry, petroleum, papermaking and the like. The waste liquid contains a large amount of organic matters and inorganic salts, so that the pollution to the environment is high, and the environment is seriously polluted by directly discharging the high-salt organic waste liquid. In the treatment process, the wastewater can corrode pipelines and reaction instruments; meanwhile, high salt causes poor biodegradability of wastewater, high treatment cost and poor effect. How to treat and upgrade the high-salt organic waste liquid is a current industry hotspot.
The traditional technology for treating the high-salt organic wastewater can only treat salt or organic matters in the waste liquid, has serious secondary pollution problem, and has complex treatment process and high cost. The advanced oxidation, adsorption, electrolysis and extraction methods can only treat organic matters, and have the problem of secondary pollution; the thermal process can effectively remove salt, but has serious problems of energy consumption and equipment loss, and the separated salt is a mixture of various inorganic salts (NaCl, KCl, na SO4 and the like) and impurities (heavy metal elements), SO that the recycling cannot be realized; the membrane process has little pollution, but the membrane has high preparation cost, easy structure and small flux, which leads to limited industrial application. The prior art 201810040048.3 discloses a two-stage submerged combustion evaporation integrated treatment method of organic waste liquid, only optimizes the arrangement of an evaporation tank, and finally obtains mixed residues of organic matters, inorganic salts and heavy metals, thereby having the problem of secondary pollution and not realizing the recycling. Therefore, in the industry of high-salt organic waste liquid treatment, there is a need for a system and a method that can treat organic matters and inorganic salts simultaneously with high efficiency and realize mixed salt recycling.
The above information disclosed in the background section is only for enhancement of understanding of the background of the invention and therefore may contain information that does not form the prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to provide a system and a method for processing high-salt organic waste liquid and recycling the high-salt organic waste liquid by plasma bottom blowing, which can solve the problem of secondary pollution caused by organic matters, inorganic salts and heavy metals in the waste liquid at one time, solve the problem of pollution caused by the organic matters, the inorganic salts and the heavy metals, and realize recycling of the inorganic salts.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention relates to a reaction tank for treating high-salt organic waste liquid and a recycling system by plasma bottom blowing,
a reaction tank body which accommodates high-salt organic waste liquid, a through hole is arranged at the bottom of the reaction tank body,
a feed port communicated with the upper part of the reaction tank body to introduce the high-salt organic waste liquid,
the plasma generator is arranged at the bottom of the reaction tank body to provide a heat source, a nozzle of the plasma generator extends into the reaction tank body in a sealing way through the through hole, the extending length of the nozzle from the bottom of the reaction tank body is 5 cm to 10cm,
a slag outlet arranged at the lower part of the reaction tank body for guiding out slag,
the flue gas outlet is arranged at the top of the reaction tank body to guide out flue gas, and the flue gas comprises gaseous inorganic salt, carbon dioxide and water vapor;
a salt separating system connected with the reaction tank, wherein the salt separating system comprises,
one end of the salt separating flow passage is communicated with the flue gas outlet, the other end of the salt separating flow passage is a tail gas outlet,
a plurality of curing plates which are distributed along the extending direction of the salt separating flow channel to exchange the heat of the flue gas in the salt separating flow channel, wherein the curing plates are hollow structures attached to the salt separating flow channel,
an air inlet, the flow of which can controllably flow normal-temperature air to a plurality of curing plates to adjust the temperature distribution of the curing plates, so that the curing plates respectively cure and deposit the gaseous inorganic salt in the flue gas according to the condensation, crystallization and curing temperature of the inorganic salt,
and the water outlet is connected with the salt separation flow passage to lead out condensed liquid water in the flue gas.
In the plasma bottom blowing treatment high-salt organic waste liquid and recycling system, the temperature of a reaction tank body is 1200-1400 ℃, the high-salt organic waste liquid is stirred by plasma sprayed by a nozzle and tumbles and boils in the reaction tank body at high temperature, wherein impurities and heavy metal elements are melted into liquid and are led out from a slag outlet, and organic matter combustion, inorganic sulfate decomposition, inorganic chloride volatilization, gaseous salt and CO are carried out 2 And water vapor forming flue gas diffuses from the flue gas outlet to the salt separation system.
In the plasma bottom blowing treatment high-salt organic waste liquid and recycling system, the reaction tank body is of a hollow double-layer steel structure, the double-layer steel structure is provided with a flow guide pipe for guiding cooling medium to cool the reaction tank, and the inner wall of the reaction tank body is coated with refractory materials.
In the plasma bottom blowing treatment high-salt organic waste liquid and recycling system, the cooling medium comprises liquid water, gaseous air, water vapor and inert gas.
In the plasma bottom blowing treatment high-salt organic waste liquid and recycling system, a plurality of plasma generators are arranged at the bottom of a reaction tank, the power of the plasma generators is 10-200 kW, and the plasma generators are wound on a refractory fiber blanket and are connected with the reaction tank body through a flange.
In the plasma bottom blowing treatment high-salt organic waste liquid and recycling system, a salt separating runner is a serpentine runner, a plurality of curing plates are arranged at bending positions of the serpentine runner, the curing plates are hollow double-layer plate structures, guide plates for prolonging heat exchange stroke and time of cold medium in the curing plates are arranged in the curing plates, and thermocouples for feeding back temperature changes in real time are arranged in the curing plates.
In the system for treating high-salt organic waste liquid and recycling the high-salt organic waste liquid by plasma bottom blowing, a plasma generator is provided with a working medium inlet, a power interface, a coolant inlet and a coolant outlet, wherein the working medium comprises oxygen-containing gas, and the coolant comprises liquid water, gaseous air or inert gas.
In the plasma bottom blowing treatment high-salt organic waste liquid and recycling system, after the normal-temperature oxygen-containing gas is fully exchanged in the salt separation system, a plasma generator is introduced into the salt separation system through a hot air injection port to serve as a working medium, and the hot air injection port is provided with an electromagnetic valve for switching the gas flow of the inlet of the plasma generator and a remote control device connected with the electromagnetic valve.
In the plasma bottom blowing treatment high-salt organic waste liquid and recycling system, at least two curing plates are distributed at 850-900 ℃ and 800-850 ℃ to cure and deposit sodium chloride and potassium chloride.
A method for treating high-salt organic waste liquid and a recycling system by plasma bottom blowing comprises the following steps,
the plasma generator at the bottom of the reaction tank body is installed in place, a nozzle of the plasma generator extends into the reaction tank body in a sealing way through the through hole, the extending length of the nozzle from the bottom of the reaction tank body is 5 cm to 10cm, and the reaction tank is under micro negative pressure;
opening an air valve of a salt separation system and a plasma generator, introducing air, simultaneously opening each plasma generator starting device, starting the plasma generator, gradually increasing the power of the plasma generator according to different power steps, and starting feeding when the temperature of a reaction tank reaches 1300 ℃;
the high-salt organic waste liquid enters the reaction tank body from the feed inlet, the liquid level of the reaction tank is gradually established, the load and the back pressure of the plasma generator are increased, and the air inlet flow of the salt separation system is adjusted to adjust the temperature distribution of a plurality of curing plates;
maintaining the feeding process, opening a tail gas outlet, controlling the opening of a valve of the tail gas outlet according to the high-salt organic waste liquid component, maintaining the feeding and the tail gas discharging to achieve dynamic balance, periodically opening a slag outlet, discharging slag, respectively solidifying and depositing the gaseous inorganic salt in the flue gas by a plurality of solidifying plates according to the condensation and crystallization solidifying temperature of the inorganic salt,
stopping feeding, keeping the open state of a tail gas outlet and a slag outlet, gradually reducing the load of a plasma generator, closing a power supply of the plasma generator after the slag in the reaction tank body is exhausted, keeping the air volume and the back pressure of the plasma generator, preventing residual molten liquid in the reaction tank from entering the plasma generator, closing the air of the plasma generator and keeping the flow of a coolant inlet after the temperature of the reaction tank is reduced to below 600 ℃, closing a valve of the coolant inlet after the temperature of the reaction tank is reduced to below 100 ℃, opening a salt separation system, and taking down inorganic salts solidified and crystallized by different solidifying plates for collection.
In the technical scheme, the system and the method for treating the high-salt organic waste liquid and recycling the high-salt organic waste liquid by plasma bottom blowing have the following beneficial effects: an air plasma generator is arranged at the bottom of the reaction tank, high-salt organic waste liquid is rolled and boiled in the reaction tank under the severe stirring of high-energy high-enthalpy plasma and the influence of high temperature, the temperature of the reaction tank is about 1300 ℃, organic matters are combusted, inorganic sulfate is decomposed, inorganic chloride is volatilized, and gaseous products H are obtained 2 O (g), gaseous salt and CO 2 And diffusing from the flue gas channel to a salt separation system; the salt separating system is used for precisely controlling the temperature through indirect heat exchange, and various high-purity salts are obtained on the inner wall surface of the salt separating system. In the treatment process, most of the heat release of the plasma is absorbed by the high-salt organic waste liquid, so that the heat and mass transfer is greatly improved, the heat efficiency is remarkably improved, the treatment intensity is high, the treatment scale is adjustable, the applicability of the raw materials is high, and the thorough treatment and the recycling utilization of the high-salt organic waste liquid are realized.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.
Fig. 1 is a schematic structural diagram of a system for treating high-salt organic waste liquid and recycling by plasma bottom blowing according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In order to make the technical scheme of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings.
Referring to fig. 1, in one embodiment, a reaction tank for plasma bottom blowing treatment of high-salt organic waste liquid and a recycling system of the present invention comprises,
a reaction tank body 1 which accommodates high-salt organic waste liquid, a through hole is arranged at the bottom of the reaction tank body 1,
a feed port 3 communicating with the upper portion of the reaction tank body 1 to introduce the high-salt organic waste liquid,
the plasma generator 2 is arranged at the bottom of the reaction tank body 1 to provide a heat source, the nozzle of the plasma generator 2 extends into the reaction tank body 1 in a sealing way through the through hole, the extending length of the nozzle from the bottom of the reaction tank body 1 is 5 cm to 10cm,
a slag outlet 5 provided at the lower portion of the reaction tank body 1 to discharge slag,
a flue gas outlet 4, which is arranged at the top of the reaction tank body 1 to lead out flue gas, wherein the flue gas comprises gaseous inorganic salt, carbon dioxide and water vapor;
a salt separating system 6 connected with the reaction tank, wherein the salt separating system 6 comprises,
a salt separating flow passage, one end of which is communicated with the flue gas outlet 4, the other end is a tail gas outlet 10,
a plurality of curing plates 8 which are distributed along the extending direction of the salt separating flow channel to exchange the heat of the flue gas in the salt separating flow channel, wherein the curing plates 8 are hollow structures which are attached to the salt separating flow channel,
an air inlet 7, the flow of which controllably flows normal-temperature air to the plurality of curing plates 8 to adjust the temperature distribution of the plurality of curing plates 8, so that the plurality of curing plates 8 respectively cure and deposit the gaseous inorganic salts in the flue gas according to the condensation crystallization curing temperature of the inorganic salts,
and a water outlet 11 connected with the salt separation flow passage to guide out condensed liquid water in the flue gas.
In the preferred embodiment of the plasma bottom blowing treatment high-salt organic waste liquid and recycling system, the temperature of the reaction tank body 1 is 1200-1400 ℃, the high-salt organic waste liquid is stirred by the plasma sprayed by the nozzle and tumbles and boils in the reaction tank body 1 at high temperature, wherein impurities and heavy metal elements are melted into liquid state and are led out from the slag outlet 5, and organic matter is combusted, inorganic sulfate is decomposed, inorganic chloride is volatilized, gaseous salt and CO are volatilized 2 And water vapor forming flue gas diffuses from the flue gas outlet 4 to the salt separation system 6.
In the preferred embodiment of the plasma bottom blowing treatment of the high-salt organic waste liquid and the recycling system, the reaction tank body 1 is of a hollow double-layer steel structure, the double-layer steel structure is provided with a flow guide pipe for guiding a cooling medium to cool the reaction tank, and the inner wall of the reaction tank body 1 is sprayed with refractory materials.
In the preferred embodiment of the plasma bottom-blowing treatment of high-salt organic waste liquid and recycling system, the cooling medium comprises liquid water, gaseous air, water vapor and inert gas.
In the preferred embodiment of the plasma bottom blowing treatment high-salt organic waste liquid and recycling system, a plurality of plasma generators 2 are arranged at the bottom of the reaction tank, the power of the plasma generators 2 is 10-200 kW, and the plasma generators 2 are wound with a refractory fiber blanket and are connected with the reaction tank body 1 through flanges.
In the preferred embodiment of the plasma bottom blowing treatment high-salt organic waste liquid and recycling system, the salt separating flow channel is a serpentine flow channel, the curing plates 8 are arranged at the bending positions of the serpentine flow channel, the curing plates 8 are hollow double-layer plate structures, guide plates for prolonging the heat exchange stroke and time of a cooling medium in the curing plates 8 are arranged in the curing plates, and thermocouples 9 for feeding back temperature changes in real time are arranged in the curing plates 8.
In the preferred embodiment of the plasma bottom blowing treatment system for treating high-salt organic waste liquid and recycling the high-salt organic waste liquid, the plasma generator 2 is provided with a working medium inlet, a power interface, a coolant inlet and a coolant outlet, wherein the working medium comprises oxygen-containing gas, and the coolant comprises liquid water, gaseous air or inert gas.
In the preferred embodiment of the plasma bottom blowing treatment of high-salt organic waste liquid and the recycling system, after the normal-temperature oxygen-containing gas is fully exchanged in the salt separation system 6, the plasma generator 2 is introduced into the hot air injection port 12 as a working medium, and the hot air injection port 12 is provided with an electromagnetic valve for switching the gas flow rate at the inlet of the plasma generator 2 and a remote control device connected with the electromagnetic valve.
In the preferred embodiment of the plasma bottom blowing treatment of high-salt organic waste liquid and recycling system, at least two curing plates 8 are provided with temperature distribution between 850 ℃ and 900 ℃ and between 800 ℃ and 850 ℃ to cure and deposit sodium chloride and potassium chloride.
In one embodiment, the plasma bottom blowing treatment high-salt organic waste liquid and recycling system is provided with an air plasma generator 2 at the bottom of the reaction tank and is used for high-energy high-enthalpy plasmaUnder the influence of intense stirring and high temperature, the high-salt organic waste liquid is rolled and boiled in a reaction tank, the temperature of the reaction tank is about 1300 ℃, organic matters are combusted, inorganic sulfate is decomposed, inorganic chloride is volatilized, and gaseous products H are obtained 2 O (g), gaseous salt and CO 2 Etc. from the flue gas channel to the salt separation system 6; the salt separation system 6 is used for precisely controlling the temperature through indirect heat exchange according to the de-sublimation temperature of NaCl and KCl, so that high-purity various salts are obtained on the inner wall surface of the salt separation system 6; and the heat exchange medium air is introduced into the plasma generator 2 as a plasma working medium after being fully heated by heat exchange in the salt separation system 6, so that the heat efficiency is improved. In the treatment process, most of the heat release of the plasma is absorbed by the high-salt organic waste liquid, so that the heat and mass transfer is greatly improved, the heat efficiency is remarkably improved, the treatment strength is high, the treatment scale is adjustable, and the raw material applicability is strong. The temperature in the reaction tank is about 1300 ℃, organic matters in the waste liquid are thoroughly decomposed, the high-purity sodium chloride and potassium chloride are obtained by solidifying in different temperature intervals of the salt separation system 6 after the salt is volatilized, the quenching control of the flue gas outlet 4 is realized, the generation of dioxin is greatly reduced, and the thorough treatment and the recycling utilization of the high-salt organic waste liquid are realized.
In one embodiment, in the reaction tank, the high-salt organic waste liquid is quickly heated in the reaction tank, water is quickly evaporated, organic matters and high-temperature air are subjected to combustion reaction and are decomposed into water and carbon dioxide, inorganic chloride salt is continuously heated until volatilized into gas, inorganic sulfate is decomposed at high temperature, a small amount of residual impurities, heavy metal elements and the like are melted into liquid, and the liquid is discharged through the slag outlet 5 and quickly cooled, so that heavy metal is covered and sealed by vitrified impurities, and harmless is realized. The reaction tank body 1 is made of double-layer steel, is welded and sealed, is hollow in the interior and is provided with a flow guide pipe, liquid water, gaseous air, water vapor, other inert gas and other mediums can be introduced, and the reaction tank body 1 is cooled and protected for the steel reaction tank body 1. Refractory materials are sprayed on the inner side of the furnace wall of the reaction tank body 1, so that the reaction tank body 1 is further protected. The plasma generator 2 is arranged at the bottom of the reaction tank and provides a heat source for the reaction tank. The bottom of the reaction tank is provided with a through hole, a nozzle of the plasma generator 2 extends into the bottom of the reaction tank, the extending length of the upper edge of the refractory material at the bottom of the reaction tank can be-5 cm to 10cm, the plasma generator 2 body is wound with a refractory fiber blanket, and the lower part of the plasma generator 2 is connected with the reaction tank body 1 through a flange to prevent melt in the reaction tank from leaking. The number of the plasma generators 2 at the bottom of the reaction tank can be set to be 1-16 sets according to the treatment scale. The power of the plasma generator 2 can be set to 10-200 kW/set according to the treatment intensity. The plasma generator 2 is provided with a working medium inlet, a power interface, a coolant inlet and a coolant outlet. The working medium is primarily an oxygen-containing gas, including but not limited to air or an oxygen-enriched gas. The coolant includes, but is not limited to, liquid water, gaseous air, inert gas, and the like. After the normal-temperature oxygen-containing gas is fully exchanged in the salt separation system 6, the oxygen-containing gas is introduced into the plasma generator 2 through the hot air injection port 12 and is used as working medium gas, so that the heat utilization efficiency is improved, and the energy consumption is reduced. The hot air injection port 12 is provided with an electromagnetic valve and a remote control device, so that the gas flow rate at the inlet of the plasma generator 2 can be rapidly switched, and the hot air injection port is used for working condition adjustment or emergency gas flow rate switching.
The feed inlet 3 is positioned at the upper part of the reaction tank, so that the function of smoothly feeding the high-salt organic waste liquid into the furnace is realized. The horizontal angle of the feeding pipe is 60-80 degrees, the length of the feeding pipe is 0.1-1.5 m, and the height of the lower port of the feeding pipe from the bottom of the reaction tank is 0.5-2 m. The specific horizontal angle, length and height of the feeding pipe from the bottom of the reaction tank are determined according to the arrangement of the plasma generator 2 in the reaction tank, and the condition that the material to be fed into the furnace is near the disturbance center of the plasma generator 2 is ensured so as to improve the material reaction rate.
The flue gas outlet 4 is used for introducing high-temperature flue gas in the reaction tank into the salt separation system 6 through a flue gas fan, wherein the high-temperature flue gas comprises organic matter combustion product steam, carbon dioxide, volatile inorganic salt flue gas and the like. The flue gas channel is a hole of the sedimentation tank body, and has the functions of high temperature resistance and corrosion resistance. The diameter of the flue gas channel is 0.2-1.0 m, and the specific diameter is determined according to the treatment scale of the waste liquid and the generated flue gas quantity.
The slag outlet 5 is arranged at the bottom of the reaction tank and is used for discharging impurity and heavy metal element molten liquid and discharging liquid of the reaction tank under the condition of emergency shutdown, so that the solidification of materials in the reaction tank is avoided. The slag hole is made of a precipitation tank body refractory material, has high temperature resistance and corrosion resistance, and has a thickness of 5-20 cm.
In one embodiment, in the salt separation system 6, the high temperature flue gas discharged from the reaction tank flue gas outlet 4 enters the salt separation system 6. A plurality of curing plates 8 are arranged in the salt separation system 6, the curing plates 8 exchange heat with high-temperature flue gas indirectly through normal-temperature air, gaseous inorganic salt is cooled and condensed on the wall surfaces of the curing plates 8 in different temperature ranges, water vapor is also liquefied into water to be discharged, and the residual flue gas is discharged through a tail gas outlet 10 and is rapidly reduced to normal temperature, so that the reformation of dioxin is prevented. Finally, high-purity sodium chloride and potassium chloride and clean water and tail gas are obtained. The salt separating system 6 can be arranged one by one, the salt separating system 6 is opened periodically, and inorganic salts solidified and crystallized by different solidifying plates 8 are taken down for collection, so that continuous production is ensured.
The air inlet 7 is used as an inlet of a cooling medium of the salt separating system 6, and is provided with a flow control valve to control the flow of normal-temperature air entering the salt separating system 6, so that the temperature distribution of the curing plate 8 in the salt separating system 6 is accurately controlled. The curing plate 8 is an important component of the salt separating system 6, and the gaseous inorganic salt in the flue gas is cured and separated in the curing plate 8. The solidifying plate 8 is made of double-layer high-temperature-resistant steel or other high-temperature-resistant corrosion-resistant alloy materials, is welded and sealed, is hollow in the interior, and is provided with a guide plate in the middle of the double-layer plate, so that the heat exchange stroke and time of the cold medium in the solidifying plate 8 are prolonged. The inner wall of the interlayer of the curing plate 8 is cooled by a cold medium, the outer wall of the interlayer is contacted with high-temperature flue gas, and the curing and separation of the gaseous inorganic salt are completed in an indirect heat exchange mode. A thermocouple 9 is arranged in the curing plate 8 to feed back temperature change in real time. And the temperature feedback information of each curing plate 8 regulates and controls the air flow of the cold medium, so that the temperature distribution of the curing plates 8 is ensured to be in a reasonable interval. According to the condensation crystallization solidification temperature of gaseous sodium chloride and potassium chloride, different solidification plates 8 are respectively arranged at the temperature distribution of 850-900 ℃ and 800-850 ℃, and the solidification deposition of high-purity sodium chloride and potassium chloride inorganic salt on the solidification plates 8 with different temperature distribution is ensured. The curing plates 8 can be arranged in parallel according to the heat exchange requirement of the high-temperature flue gas flow, and each curing plate 8 can be provided with a cold medium air injection opening according to the heat exchange requirement so as to ensure the curing and separation requirements of the gaseous inorganic salt. The tail gas outlet 10 is positioned at the bottom of the salt separation system 6, and after the high-temperature flue gas is solidified by the gaseous inorganic salt, the residual tail gases such as water vapor, carbon dioxide and the like are discharged from the tail gas outlet 10. The tail gas outlet 10 is provided with a quenching treatment device, so that the tail gas is rapidly cooled, the regeneration of pollution gases such as dioxin is avoided, and the cleaning of the tail gas is ensured. The diameter of the tail gas outlet 10 is 0.2-1.0 m, and the specific diameter is determined according to the treatment scale of the waste liquid and the generated smoke amount. The water outlet 11 is used as a spare liquid water outlet for discharging liquid water under special conditions, so that the normal flow of smoke in the salt separation system 6 and the solidification and separation of inorganic salt are prevented from being influenced. The drain 11 is located at the bottom of the salt separation system 6.
A method for treating high-salt organic waste liquid and a recycling system by plasma bottom blowing comprises the following steps,
the plasma generator 2 at the bottom of the reaction tank body 1 is installed in place, the nozzle of the plasma generator 2 extends into the reaction tank body 1 in a sealing way through the through hole, the extending length of the nozzle from the bottom of the reaction tank body 1 is 5 cm to 10cm, and the reaction tank is under micro negative pressure;
opening air valves of the salt separation system 6 and the plasma generator 2, introducing air, simultaneously opening a starting device of each plasma generator 2, starting the plasma generator 2, gradually lifting the power of the plasma generator 2 according to different power steps, and starting feeding when the temperature of the reaction tank reaches 1300 ℃;
the high-salt organic waste liquid enters the reaction tank body 1 from the feed inlet 3, the liquid level of the reaction tank is gradually established, the load and the back pressure of the plasma generator 2 are increased, and the flow of the air inlet 7 of the salt separation system 6 is regulated to regulate the temperature distribution of a plurality of curing plates 8;
maintaining the feeding process, opening a tail gas outlet 10, controlling the opening of a valve of the tail gas outlet 10 according to the high-salt organic waste liquid component, maintaining the feeding and the tail gas discharging to achieve dynamic balance, periodically opening a slag outlet 5, discharging slag, respectively solidifying and depositing the gaseous inorganic salt in the flue gas by a plurality of solidifying plates 8 according to the condensation and crystallization solidifying temperature of the inorganic salt,
stopping feeding, keeping the open state of the tail gas outlet 10 and the slag outlet 5, gradually reducing the load of the plasma generator 2, closing the power supply of the plasma generator 2 after the slag in the reaction tank body 1 is exhausted, keeping the air volume and the back pressure of the plasma generator 2, preventing residual molten liquid in the reaction tank from entering the plasma generator 2, closing the air of the plasma generator 2 and keeping the inlet flow of a coolant after the temperature of the reaction tank is reduced to below 600 ℃, closing the inlet valve of the coolant after the temperature of the reaction tank is reduced to below 100 ℃, opening the salt separation system 6, and taking down inorganic salts solidified and crystallized by different solidifying plates 8 for collecting.
In one embodiment, the treatment method for treating the high-salt organic waste liquid and the recycling system by plasma bottom blowing comprises the following steps,
1) Preparation before start-up
The plasma generator 2 at the bottom of the reaction tank is installed in place, and the coolant inlet and outlet valves of the reaction tank and the plasma generator 2 are opened to establish cooling circulation. And opening a valve of the flue gas outlet 4, opening a flue gas fan, and controlling the reaction tank to be at micro negative pressure.
2) Melting furnace start-up
(1) And opening the salt separating system 6 and the air valves of each plasma generator 2, introducing air, and simultaneously opening the starting devices of each plasma generator 2 to start the plasma generator 2. According to the steps of different powers, the power of the plasma generator 2 is gradually increased, and when the temperature of the reaction tank reaches about 1300 ℃, feeding is started.
(2) The high-salt organic waste liquid material enters the reaction tank from the feed inlet 3, the liquid level of the reaction tank is gradually established, the condition of the plasma generator 2 is observed in the process, the load and the back pressure of the plasma generator 2 are gradually increased, the coolant loop temperature of the reaction tank and the sedimentation tank is observed, the flow rate of the coolant inlet or the temperature of the coolant is timely adjusted, and the coolant is prevented from volatilizing when reaching the boiling point. Gradually adjusting the flow of the air inlet 7 of the salt separating system 6, and ensuring the temperature of the corresponding curing plate 8 to be 850-900 ℃ and 800-850 ℃ respectively.
(3) After the liquid level in the reaction tank reaches above the slag hole of the reaction tank, the normal production process is started.
3) Normal production
And (3) maintaining the feeding process, opening a tail gas outlet 10, and controlling the opening of a valve of the tail gas outlet 10 according to the high-salt organic waste liquid material components to maintain the feeding and the tail gas discharging to achieve the basic dynamic balance.
And (5) periodically opening a slag port valve to discharge a proper amount of impurity slag.
The normal production process keeps observing the condition of the plasma generator 2, the temperature of the solidifying plate 8 and the temperature of the coolant loop, and avoids the extinction of the plasma generator 2, the abnormal temperature of the solidifying plate 8 or the overtemperature of the coolant.
4) Furnace shutdown
Stopping feeding, keeping the valve opening state of the tail gas outlet 10 and the slag outlet 5, gradually reducing the load of the plasma generator 2, closing the power supply of the plasma generator 2 after the slag in the reaction tank and the sedimentation tank is exhausted, keeping the air volume and the back pressure of the plasma generator 2, and preventing residual molten liquid in the reaction tank from entering the plasma generator 2.
After the temperature of the reaction tank is reduced to below 600 ℃, the air of the plasma generator 2 is turned off. The coolant inlet flow is maintained.
After the temperature of the reaction tank is reduced to below 100 ℃, the coolant inlet valve is closed.
After the temperature of each system was lowered to room temperature, the plasma generator 2 and each part of the reaction tank and salt separation system 6 were inspected. The salt separating system 6 is opened, and the inorganic salt solidified and crystallized by the different solidifying plates 8 is removed for collection.
5) Emergency furnace-stopping device
Under the condition of emergency furnace shutdown, the power supply of the plasma generator 2 is turned off, the gas quantity and the back pressure of the plasma generator 2 are maintained, and the residual melt in the reaction tank is prevented from entering the plasma generator 2. And (3) opening a slag port valve and a tail gas port valve of the reaction tank, and rapidly discharging slag and tail gas.
After the temperature of the reaction tank is reduced to below 600 ℃, the air of the plasma generator 2 is turned off. The coolant inlet flow is maintained.
After the temperature of the reaction tank is reduced to below 100 ℃, the coolant inlet valve is closed.
After the temperature of each system was lowered to room temperature, the plasma generator 2 and each part of the reaction tank and salt separation system 6 were inspected.
Example 1:
and selecting high-salt organic waste liquid of a certain coal chemical industry enterprise as a raw material. And 22 branches of 100kW power plasma generators are respectively arranged in the reaction tanks. And opening the coolant inlet and outlet valves of the reaction tank and the plasma generator 2, and establishing cooling circulation. And opening a valve of the smoke outlet 4, opening a smoke blower, and controlling the reaction tank to be at micro negative pressure.
And opening the salt separating system 6 and the air valves of each plasma generator 2, introducing air, and simultaneously opening the starting devices of each plasma generator 2 to start the plasma generator 2. According to different power steps, the power of the plasma generator 2 is gradually increased to about 60% of the load, and when the temperature of the reaction tank reaches about 1300 ℃, feeding is started.
The high-salt organic waste liquid material enters the reaction tank from the feed inlet 3, the liquid level of the reaction tank is gradually established, the condition of the plasma generator 2 is observed in the process, the load and the back pressure of the plasma generator 2 are gradually increased, the coolant loop temperature of the reaction tank and the sedimentation tank is observed, the coolant inlet flow or the coolant outlet temperature is timely adjusted, the coolant outlet temperature is kept to be lower than 50 ℃, and the coolant is prevented from volatilizing when reaching the boiling point. Gradually adjusting the flow of the air inlet 7 of the salt separating system 6, and ensuring the temperature of the corresponding curing plate 8 to be 850-900 ℃ and 800-850 ℃ respectively.
After the liquid level in the reaction tank reaches above the slag hole of the reaction tank, the normal production process is started.
And (3) maintaining the feeding process, opening a tail gas outlet 10, and controlling the opening of a valve of the tail gas outlet 10 according to the high-salt organic waste liquid material components to maintain the feeding and the tail gas discharging to achieve the basic dynamic balance. The treatment rate of the high-salt organic waste liquid is about 30 t/d, the high-purity sodium chloride is collected to be more than 2 t/d, and the high-purity potassium chloride is collected to be about 0.5 t/d. In the production process, the high-salt organic waste liquid contains about 25% of organic matters, so that the combustion heat release can properly reduce the load of the plasma generator 2 and the energy consumption and the cost.
The valve of the slag outlet 5 is opened periodically to discharge a proper amount of impurity slag. The salt separating system 6 is switched every 12 hours, the salt separating system 6 which works for 12 hours is opened, and inorganic salt solidified and crystallized by different solidifying plates 8 is taken down for collection.
The normal production process keeps observing the condition of the plasma generator 2, the temperature of the solidifying plate 8 and the temperature of the coolant loop, and avoids the extinction of the plasma generator 2, the abnormal temperature of the solidifying plate 8 or the overtemperature of the coolant.
Example 2:
the melting furnace was operating normally with a plasma generator 2 load of about 80% and a feed rate of about 1250kg/h. And after the slag in the reaction tank and the sedimentation tank is exhausted, the power supply of the plasma generator 2 is turned off, the air volume and the back pressure of the plasma generator 2 are maintained, and residual molten liquid in the reaction tank is prevented from entering the plasma generator 2.
After the temperature of the reaction tank is reduced to below 600 ℃, the air of the plasma generator 2 is turned off. The coolant inlet flow is maintained.
After the temperature of the reaction tank is reduced to below 100 ℃, the coolant inlet valve is closed.
After the temperature of each system was lowered to room temperature, the plasma generator 2 and each part of the reaction tank and salt separation system 6 were inspected. The salt separating system 6 is opened, and the inorganic salt solidified and crystallized by the different solidifying plates 8 is removed for collection.
Finally, it should be noted that: the described embodiments are intended to be illustrative of only some, but not all, of the embodiments disclosed herein and, based on the embodiments disclosed herein, all other embodiments that may be made by those skilled in the art without the benefit of the teachings herein are intended to be within the scope of this application.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that modifications may be made to the described embodiments in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive of the scope of the invention, which is defined by the appended claims.
Claims (10)
1. A system for treating high-salt organic waste liquid and recycling the same by plasma bottom blowing is characterized by comprising,
the reaction tank comprises a reaction tank body, wherein the reaction tank comprises a reaction tank body,
a reaction tank body which accommodates high-salt organic waste liquid, a through hole is arranged at the bottom of the reaction tank body,
a feed port communicated with the upper part of the reaction tank body to introduce the high-salt organic waste liquid,
the plasma generator is arranged at the bottom of the reaction tank body to provide a heat source, a nozzle of the plasma generator extends into the reaction tank body in a sealing way through the through hole, the extending length of the nozzle from the bottom of the reaction tank body is 5 cm to 10cm,
a slag outlet arranged at the lower part of the reaction tank body for guiding out slag,
the flue gas outlet is arranged at the top of the reaction tank body to guide out flue gas, and the flue gas comprises gaseous inorganic salt, carbon dioxide and water vapor;
a salt separating system connected with the reaction tank, wherein the salt separating system comprises,
one end of the salt separating flow passage is communicated with the flue gas outlet, the other end of the salt separating flow passage is a tail gas outlet,
a plurality of curing plates which are distributed along the extending direction of the salt separating flow channel to exchange the heat of the flue gas in the salt separating flow channel, wherein the curing plates are hollow structures attached to the salt separating flow channel,
an air inlet, the flow of which can controllably flow normal-temperature air to a plurality of curing plates to adjust the temperature distribution of the curing plates, so that the curing plates respectively cure and deposit the gaseous inorganic salt in the flue gas according to the condensation, crystallization and curing temperature of the inorganic salt,
and the water outlet is connected with the salt separation flow passage to lead out condensed liquid water in the flue gas.
2. The system for treating high-salt organic waste liquid and recycling the same by plasma bottom blowing according to claim 1, wherein the temperature of the reaction tank body is 1200-1400 ℃, the high-salt organic waste liquid is stirred by plasma sprayed by a nozzle and tumbled and boiled in the reaction tank body at high temperature, wherein impurities and heavy metal elements are melted into liquid and are led out from a slag outlet, and organic matter is combusted, inorganic sulfate is decomposed, inorganic chloride is volatilized, gaseous salt and CO are volatilized 2 And steamAnd the formed flue gas diffuses from a flue gas outlet to a salt separation system.
3. The system for treating high-salt organic waste liquid and recycling by plasma bottom blowing according to claim 1, wherein the reaction tank body is of a hollow double-layer steel structure, the double-layer steel structure is provided with a flow guide pipe for guiding a cooling medium to cool the reaction tank, and the inner wall of the reaction tank body is sprayed with refractory materials.
4. A system for the bottom-blowing treatment of high-salt organic waste liquids and recycling as set forth in claim 3, wherein said cooling medium comprises liquid water, gaseous air, water vapor, and inert gas.
5. The system for treating high-salt organic waste liquid and recycling by plasma bottom blowing according to claim 1, wherein a plurality of plasma generators are arranged at the bottom of the reaction tank, the power of the plasma generators is 10-200 kW, and the plasma generators are wound on a refractory fiber blanket and are connected with the reaction tank body through flanges.
6. The system for treating high-salt organic waste liquid and recycling by plasma bottom blowing according to claim 1, wherein the salt separating flow channel is a serpentine flow channel, the plurality of curing plates are arranged at bending positions of the serpentine flow channel, the curing plates are of a hollow double-layer plate structure, guide plates for prolonging heat exchange stroke and time of a cooling medium in the curing plates are arranged in the curing plates, and thermocouples for feeding back temperature changes in real time are arranged in the curing plates.
7. The system for treating high-salt organic waste liquid and recycling by plasma bottom blowing according to claim 1, wherein the plasma generator is provided with a working medium inlet, a power interface, a coolant inlet and a coolant outlet, the working medium comprises oxygen-containing gas, and the coolant comprises liquid water, gaseous air or inert gas.
8. The system for treating high-salt organic waste liquid and recycling by bottom blowing of plasma according to claim 7, wherein after the normal-temperature oxygen-containing gas is fully exchanged in the salt separation system, the plasma generator is introduced as a working medium through a hot air injection port, and the hot air injection port is provided with an electromagnetic valve for switching the gas flow rate at the inlet of the plasma generator and a remote control device connected with the electromagnetic valve.
9. The system for treating high-salt organic waste liquid and recycling by plasma bottom blowing according to claim 1, wherein at least two curing plates have a temperature distribution between 850-900 ℃ and 800-850 ℃ to cure deposited sodium chloride and potassium chloride.
10. The method for treating a high-salt organic waste liquid and a recycling system by plasma bottom blowing according to any one of claims 1 to 9, characterized by comprising the steps of,
the plasma generator at the bottom of the reaction tank body is installed in place, a nozzle of the plasma generator extends into the reaction tank body in a sealing way through the through hole, the extending length of the nozzle from the bottom of the reaction tank body is 5 cm to 10cm, and the reaction tank is under micro negative pressure;
opening an air valve of a salt separation system and a plasma generator, introducing air, simultaneously opening each plasma generator starting device, starting the plasma generator, gradually increasing the power of the plasma generator according to different power steps, and starting feeding when the temperature of a reaction tank reaches 1300 ℃;
the high-salt organic waste liquid enters the reaction tank body from the feed inlet, the liquid level of the reaction tank is gradually established, the load and the back pressure of the plasma generator are increased, and the air inlet flow of the salt separation system is adjusted to adjust the temperature distribution of a plurality of curing plates;
maintaining the feeding process, opening a tail gas outlet, controlling the opening of a valve of the tail gas outlet according to the high-salt organic waste liquid component, maintaining the feeding and the tail gas discharging to achieve dynamic balance, periodically opening a slag outlet, discharging slag, respectively solidifying and depositing the gaseous inorganic salt in the flue gas by a plurality of solidifying plates according to the condensation and crystallization solidifying temperature of the inorganic salt,
stopping feeding, keeping the open state of a tail gas outlet and a slag outlet, gradually reducing the load of a plasma generator, closing a power supply of the plasma generator after the slag in the reaction tank body is exhausted, keeping the air volume and the back pressure of the plasma generator, preventing residual molten liquid in the reaction tank from entering the plasma generator, closing the air of the plasma generator and keeping the flow of a coolant inlet after the temperature of the reaction tank is reduced to below 600 ℃, closing a valve of the coolant inlet after the temperature of the reaction tank is reduced to below 100 ℃, opening a salt separation system, and taking down inorganic salts solidified and crystallized by different solidifying plates for collection.
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