Incinerator for treating high-organic-salt-containing wastewater

Abstract

The application discloses a kind of incinerator for treating high organic salt-containing wastewater, including furnace body, the furnace body is sequentially provided with high-temperature incineration section, mixed cooling section I, heat exchange tube cooling rectification section, carbonate particle separation section, flue gas return section and mixed cooling section II from top to bottom.The negative pressure furnace type is used, and the "top burning" horizontal flow burner is used to carry out high-temperature incineration on the high organic salt-containing wastewater, to carry out multiple cooling and carbonate particle separation on the product, and harmless incineration treatment of the high organic salt-containing wastewater can be realized.The incinerator is suitable for using the "top burning" incineration process to treat high organic salt-containing wastewater scheme, realizes liquid-solid conversion of carbonate droplets in the furnace, realizes harmless treatment of dioxin, realizes carbonate particle separation, can greatly prolong the continuous operation time of the incinerator, and avoids carbonate caking.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of industrial furnace, more particularly, to a kind of incinerator for treating wastewater containing high organic salt. BACKGROUND

[0002] With the scale, centralization and large-scale of chemical industry, more and more chemical industrial parks need to treat wastewater. For different components of wastewater, biological method, chemical method and physical method are usually used for treatment.

[0003] Physical method mainly separates non-dissolved substances in wastewater by physical action; chemical method mainly uses chemical reaction to add chemicals in wastewater, and produces harmless substances or colloids after reaction; biological method mainly uses the metabolism function of microorganisms to decompose and oxidize organic matter into stable inorganic matter. Incineration is a kind of chemical method, which uses high temperature to burn flammable or inert residual waste, leaving ash and non-combustible substances.

[0004] Foreign research believes that it is more reasonable to use incineration than other methods for high-concentration wastewater with COD>100000ml / L and heat value>4.1868*2500KJ / kg. For example, high-concentration salt-containing dye wastewater contains high-concentration inorganic salt and a considerable amount of soluble and non-degradable organic matter, which is difficult to remove by physical and biological methods, and incineration is the best choice.

[0005] Papers and patents related to incinerators mainly focus on medical waste and household waste incineration, and there is limited information on industrial incinerators. A kind of incineration process and incineration boiler for treating high-concentration salt-containing organic waste liquid, patent number: CN103047659A, mentions a kind of incinerator, which uses top-spraying waste liquid, side arrangement of burner, side water-cooled wall of incinerator and liquid slagging structure at the bottom of the furnace. Because of the use of liquid slagging scheme, when the components of the wastewater incinerated in the incinerator are unstable, carbonate clumps are easily produced. The existing rotary kiln incinerator technology for treating acetic acid residue and butenal waste liquid can treat organic residue and dispose of hazardous chemical waste, but it mainly treats solid residue and cannot be used to treat wastewater containing high organic salt. SUMMARY

[0006] The present application aims to overcome the shortcomings of the prior art and provide an incinerator for treating wastewater containing high organic salt, which can perform high-temperature incineration on wastewater containing high organic salt, multiple cooling and carbonate particle separation on the products. It can avoid liquid slagging, eliminate dioxins in exhaust gas, recover carbonate particles, avoid carbonate clumping and reduce high-temperature corrosion of furnace bricks, thereby realizing continuous long-period operation of the incinerator.

[0007] The purpose of the present application is achieved by the following technical solutions:

[0008] The invention discloses a kind of incinerator for treating high organic salt-containing wastewater, including: high temperature incineration section, mixed cooling section I, heat exchange pipe cooling rectification section, carbonate particle separation section, flue gas return section, mixed cooling section II etc.Structure.Wherein, high temperature incineration section can also be subdivided into high temperature gas generation section, high temperature incineration section and lining protection section, specifically, high temperature gas generation section includes burner and atomizer and the incinerator area where it is located, high temperature incineration section includes the incinerator cavity position below atomizer, lining protection section includes protection plate and the incinerator area where it is located.Mixed cooling section I includes spray head I and the incinerator area where it is located, heat exchange pipe cooling rectification section includes heat exchange pipe and the incinerator area where it is located, carbonate particle separation section includes gas-solid separator and the incinerator area where it is located, flue gas return section includes flue gas returner and the incinerator area where it is located, mixed cooling section II includes spray head II, carbonate conveyor and the incinerator area where it is located.Adopting negative pressure furnace type, "top burning" horizontal flow burner, high temperature incineration is carried out to high organic salt-containing wastewater, product is cooled multiple times and carbonate particle separation is carried out, can realize the harmless incineration treatment of high organic salt-containing wastewater.This incinerator is suitable for using "top burning" incineration process to treat high organic salt-containing wastewater scheme, realizes liquid-solid conversion of carbonate droplet in furnace, realizes harmless treatment of dioxin, realizes carbonate particle separation, can greatly extend the continuous operation time of incinerator, avoids carbonate caking.

[0009] An incinerator for treating high organic salt-containing wastewater, comprising a furnace body, the furnace body is sequentially provided with a high temperature incineration section, a mixed cooling section I, a heat exchange pipe cooling rectification section, a carbonate particle separation section, a flue gas return section and a mixed cooling section II from top to bottom; a burner is arranged at the top of the furnace body, an atomizer corresponding to the burner is arranged on the furnace body, the nozzle of the atomizer extends into the furnace body and is at a certain angle with the central axis of the furnace body, a protection plate is arranged inside the furnace body below the atomizer, the mixed cooling section I comprises a spray head I arranged on the furnace body for connecting low temperature flue gas, a heat exchange pipe arranged in the furnace body perpendicular to the flue gas flow direction is arranged below the spray head I, the diameter of the furnace body below the heat exchange pipe is increased, a gas-solid separator is arranged in the furnace body below the heat exchange pipe, a flue gas returner is arranged in the furnace body below the gas-solid separator, an annular groove is formed between the flue gas returner and the inner wall of the furnace body, a flue gas hole for guiding the poor carbonate particle flue gas to be discharged into the subsequent waste heat recovery unit is arranged on the furnace body near the annular groove, a spray head II is arranged in the mixed cooling section II at the lower part of the furnace body, and a carbonate conveyor is arranged at the bottom of the furnace body.

[0010] In order to ensure the sufficient combustion of atomized wastewater, the spray head I and / or the spray head II are arranged in the furnace body in a ring shape, and the distance between the spray head I and the atomizer ensures that the atomized wastewater sprayed by the atomizer stays in the furnace body between them for more than 2 seconds.

[0011] Further, the distance between the heat exchange pipe and the spray head I ensures that dioxin can be oxidized and decomposed at high temperature.

[0012] In order to collect the carbonate and lead the carbonate-poor particle flue gas into the subsequent waste heat recovery unit, a ring groove for the carbonate-poor particle flue gas is formed between the flue gas returner and the inner wall of the furnace body, and a carbonate collection cone is arranged in the flue gas returner.

[0013] Further, the incinerator is a micro-negative pressure furnace with a high-temperature resistant lining; the burner is a multi-gun horizontal flow burner with a low-nitrogen burner; the protection plate is an Inconel 625 alloy protection plate; the heat exchange pipe is a light pipe, a finned pipe or a turbulator enhanced heat transfer pipe; the gas-solid separator is a triangular pyramid structure, a cyclone separator structure or a horn structure; and the carbonate conveyor is a carbonate slag breaking and screw conveyor.

[0014] In order to avoid the blockage of the spray head, the spray head I and / or the spray head II adopts a ring pipe with a plurality of lateral holes, and a molten salt flow guide pipe is arranged on the lateral hole.

[0015] In order to improve the effect of gas-solid separation, a gas guide ring pipe is arranged between the gas-solid separator and the flue gas returner.

[0016] Simple carbonate particle separation is also performed on the carbonate-poor particle flue gas, an upper cover plate with grooves or holes for the passage of the carbonate-poor particle flue gas is arranged on the upper part of the ring groove, and a lower cover plate with a plurality of holes or grooves for discharging carbonate particles is arranged.

[0017] In order to realize the flue gas return effect, the flue gas returner comprises a carbonate collection cone arranged at the top, a stand pipe arranged along the central axis of the furnace body is arranged below the carbonate collection cone, an opening extending to the mixing and cooling section II is arranged at the bottom of the stand pipe, a plurality of flue gas guide branches arranged obliquely are arranged at the upper end of the stand pipe, and the two ends of the flue gas guide branches are respectively communicated with the stand pipe and the ring groove, thereby forming a flue gas return channel from the mixing and cooling section II to the ring groove.

[0018] As an optional solution, the gas-solid separator is a triangular pyramid structure, and the inner diameter of the furnace body corresponding to the position of the gas-solid separator is increased.

[0019] The beneficial effects of the present application are as follows: a suitable incinerator for treating high-organic salt-containing wastewater is provided, liquid slagging is avoided, the generation conditions of carbonate particles are optimized, dioxin is eliminated, a furnace lining protection device is arranged, a carbonate separation channel is arranged, the continuous operation time of the incinerator is increased, and the carbonate caking and blockage of the subsequent system pipeline are avoided. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

[0021] Figure 1 It is a structural schematic diagram of the incinerator;

[0022] Figure 2 It is a structural schematic diagram of the incinerator; Figure 1 It is a sectional view at A-A in the incinerator;

[0023] Figure 3 It is a structural schematic diagram of the nozzle;

[0024] Figure 4 It is a schematic diagram of the flue gas flow in the incinerator.

[0025] Wherein: 1-combustor, 2-atomizer, 3-protection plate, 4-nozzle I, 5-heat exchange pipe, 6-gas-solid separator, 7-ring groove, 8-flue gas returner, 9-nozzle II, 10-carbonate conveyor. DETAILED DESCRIPTION

[0026] The technical solutions of the present application will be described in further detail below in combination with the drawings, but the protection scope of the present application is not limited to the following description. Any feature disclosed in the present specification can be replaced by other equivalent or similar features unless specifically stated. That is, each feature is only an example of a series of equivalent or similar features unless specifically stated.

[0027] The various terms appearing in the present application are only for the purpose of describing the specific embodiments and are not intended to be limiting to the present application, and the singular form is intended to include the plural form unless the context clearly indicates otherwise.

[0028] When the terms "comprise" and / or "comprising" are used in the present specification, these terms indicate the presence of the stated features, integers, steps, operations, elements, and / or components but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0029] Example 1:

[0030] An incinerator for treating wastewater containing high organic salt, the wastewater parameters are: organic sodium salt 8wt%, calculated as sodium, mainly sodium benzoate and sodium formate, total amount 12t / h. The incinerator includes the following structure:

[0031] (1) The incinerator adopts a "top burning" form, and the fuel gas mainly uses methane. A multi-gun horizontal flow burner is adopted, and the combustion produces 1150℃ "flat push flow" high-temperature gas.

[0032] (2) After the wastewater is pressurized to 0.4MPa, it is introduced into an atomizer, and 0.7MPa compressed air is used for auxiliary atomization. The atomized wastewater is sprayed into the incinerator at an angle of 60° with the axis of the incinerator for high-temperature oxidation reaction. Sodium benzoate, sodium formate and other organic salts are converted into sodium carbonate, carbon dioxide and the like. Water absorbs heat and becomes high-temperature water vapor. A protection plate is arranged below the atomizer, which is preferably an Inconel 625 alloy lining protection section, to prevent direct contact between the lining and the atomized wastewater and to prevent the lining from being eroded by alkali vapor.

[0033] (3) According to the maximum wastewater quantity and the inner diameter of the incinerator, a low-temperature flue gas annular nozzle I is arranged at the lower part of the atomizer at 16m. The annular nozzle I is arranged on the annular pipe, and the nozzles I are arranged at intervals in the 90° and 45° directions along the circumference. The setting principle is to provide a uniform airflow cooling section in the shortest length direction of the incinerator. After cooling, the flue gas temperature is about 820℃. In order to prevent the nozzles from being blocked, a molten salt flow guide pipe is arranged on the nozzles. In order to prevent the carbonates in the low-temperature flue gas from being eroded, the nozzles adopt a cobalt-nickel alloy spraying structure scheme and the nozzle flow channel is optimized.

[0034] (4) A heat exchange tube cooling and rectifying section is arranged at 5m below the airflow cooling section. The arrangement position of the heat exchange tube cooling and rectifying section is adjusted according to the dioxin content. The heat exchange tube is arranged vertically to the flue gas flow direction and is internally connected with cooling water, which can also be used for waste heat recovery. The heat exchange tube cooling and rectifying section has two functions: one is to cool the flue gas to 700℃; the other is to disturb the flue gas flow and promote the separation of carbonate particles from the flue gas. The heat exchange tube can adopt a light tube or a turbulence-enhanced heat transfer tube.

[0035] (5) A triangular pyramid gas-solid separator is used to separate sodium carbonate particles. The triangular pyramid is supported on the furnace body by 4 circular beams. In order to achieve better separation effect, the inner diameter of the incinerator at this position is increased, and the speed reduction is helpful for gas-solid separation. The sodium carbonate-rich flue gas enters the lower collecting cone along the inner side of the gas guide annular pipe. The lean flue gas passes through the pressure equalizing plate into the annular groove. The annular groove is provided with a slotted upper cover plate and a lower cover plate. The upper cover plate is a pressure equalizing plate, which is used to prevent the lean flue gas from "short circuiting" directly into the subsequent heat exchange unit, i.e. the waste heat recovery unit. The lower cover plate is slotted to discharge the settled sodium carbonate particles in the lean flue gas. The lean carbonate particle flue gas returner in this paper is the flue gas returner.

[0036] (6) In the incinerator, a low-temperature flue gas annular nozzle II is arranged on the annular pipe. The nozzle II sprays low-temperature flue gas to cool the sodium carbonate particles, and the sodium carbonate particles are cooled to 400°C, and then discharged through the lower carbonate slag breaking and screw conveyor. The flue gas at the bottom of the incinerator and the low-temperature flue gas sprayed by the nozzle II are returned to the annular groove through the flue gas return device. At the same time, the sodium carbonate particles in the flue gas return device standpipe return to the carbonate collection cone by gravity. The flue gas return device top is connected with the annular groove through three flue gas branches to return the flue gas to the annular groove. The purpose of arranging the flue gas branches in the flue gas return device is to avoid "short circuit" flow and avoid destroying the uniform negative pressure condition in the annular groove. The flue gas annular nozzle II is arranged at the lower part of the incinerator to form an angle of 30° with the central axis of the furnace body or arranged horizontally, and the number and diameter of the openings are adjusted according to the sodium carbonate content in the flue gas at this position.

[0037] (7) The incinerator selects high-temperature refractory bricks, light insulating bricks, and castable materials according to the temperature and corrosion characteristics of different parts. Because the negative pressure furnace type is adopted, especially in the structure design of the incinerator, the "full welding" structure is adopted, and special welding structure design is carried out at the column and beam positions where leakage may occur to prevent air from leaking in.

[0038] The incinerator adopts a "top burning" form, and the fuel can be fuel gas or fuel oil, and a "plug flow" high-temperature gas of >1100°C is obtained by burning; the pressurized wastewater is atomized by compressed air in the atomizer, the atomized wastewater is introduced into the high-temperature gas of >1100°C for high-temperature oxidation reaction, and the organic salt is converted into carbonate, carbon dioxide, etc., and the water is changed into high-temperature steam; a protection plate is arranged at the lower part of the atomizer, that is, the incinerator lining protection section, that is, the protection lining metal plate, and Inconel 625 alloy is preferably selected; the incinerator preferably adopts a plug flow burner and a low-nitrogen burner. According to the heat value and heat absorption of the atomized wastewater, the flow rate and temperature parameters of the high-temperature gas are calculated to ensure that the oxygen is excessive and the high-temperature section is ≥1100°C.

[0039] A low-temperature flue gas annular nozzle I is arranged at the lower part of the atomizer, and the vertical distance between the annular nozzle I and the atomizer ensures that the residence time of the atomized wastewater is >2s; the low-temperature flue gas is sprayed to cool it, and the low-temperature flue gas containing a small amount of fine carbonate particles at this position can be the flue gas containing a small amount of fine carbonate particles after waste heat recovery in the waste heat recovery unit, and the small amount of fine carbonate particles promote the conversion of carbonate droplets into uniform diameter carbonate particles. The temperature, oxygen content, and residence time of the flue gas after cooling are sufficient to ensure that most or all of the dioxins are oxidized into inorganic matter at high temperature; the nozzle considers anti-carbonate particle wear measures to prevent carbonate droplets from solidifying and blocking the nozzle; the preferred annular nozzle I adopts a structure with a plurality of lateral holes in the annular pipe, and a flow guide pipe is added outside the nozzle I to prevent the nozzle I from being blocked by carbonate solidification;

[0040] The heat exchange pipe is arranged below the annular nozzle I and perpendicular to the flow direction of the flue gas, and the pressure drop of the heat exchange section, i.e. the heat exchange pipe cooling and rectifying section, is minimized, and the vertical distance between the heat exchange pipe and the upper annular nozzle I ensures that the dioxin can be completely oxidized and decomposed at high temperature; the heat exchange pipe functions as: 1. cooling the flue gas and recovering heat; 2. reducing the working temperature of the pre-separator and the flue gas ring groove; 3. performing sufficient flow disturbance. In order to better achieve speed reduction, it is beneficial for the separation of carbonates and flue gas, and the incinerator body is expanded in diameter in the lower part of the heat exchange pipe cooling and rectifying section, of course, whether to expand depends on the salt concentration in the waste water. The heat exchange section is as short as possible, and the pressure drop is as small as possible. The heat exchange pipe can be a light pipe, a finned tube, etc., and is preferably arranged vertically to the flow direction of the flue gas;

[0041] A gas-solid separator is arranged below the heat exchange pipe cooling and rectifying section to pre-separate the flue gas; the flue gas with rich carbonate particles vertically enters the carbonate collection cone, and the flue gas with poor carbonate particles enters the outer ring groove and then enters the subsequent waste heat recovery unit through the flue gas holes in the lower side of the incinerator; the gas-solid separator utilizes the different densities of flue gas and carbonates, adopts triangular pyramids, cyclone separators, horn mouth structures, etc. to pre-separate carbonate particles. In order to reduce back mixing and pressure difference, a triangular pyramid is preferably selected, and a vertically arranged gas guide ring pipe is arranged in the lower part of the triangular pyramid; the flue gas with poor carbonates enters the ring groove along the outside of the gas guide ring pipe; the flue gas with rich carbonates enters the collection cone in the incinerator along the inside of the gas guide ring pipe. The upper part of the ring groove is preferably provided with an upper cover plate with slots or holes for flue gas with poor carbonates to pass through, and a lower cover plate with a plurality of holes or slots for discharging carbonate particles, i.e. the upper part of the flue gas ring groove is provided with an upper cover plate and a lower cover plate, and a plurality of slots or holes are opened; the lower cover plate of the ring groove is provided with holes or slots for discharging carbonate particles, and the other purpose of the above holes is to maintain the "low pressure" of the ring groove.

[0042] A low-temperature flue gas annular nozzle II is arranged in the lower part of the incinerator, and a flue gas with poor carbonate particles returner is arranged on the carbonate conveyor, and the flue gas with poor carbonate particles returns to the flue gas ring groove;

[0043] The pressure of the flue gas returner, the flue gas ring groove and the flue gas hole decreases in turn; a collection cone is also arranged below the flue gas returner, and the collected flue gas with poor carbonates is returned to the flue gas ring groove through a plurality of pipelines. In the incinerator, low-temperature flue gas or low-dew-point air is sprayed through the annular nozzle, the temperature of the carbonate particles at the bottom of the incinerator is further reduced, and the nozzle can be directed upward, horizontally or downward, and the hole diameter of each nozzle is set according to experience and ANSYS analysis, so as to avoid obvious back mixing of carbonate particles;

[0044] The incinerator is provided with a high-temperature lining made of corundum, mullite, zirconium mullite corundum brick, etc. according to the temperature and corrosion characteristics of different positions, the incinerator is a micro-negative pressure furnace, and the pressure at the side outlet of the lower part of the furnace is the lowest; the multiple connections of the outer shell are considered to be "full welding" structures to prevent air from leaking in and causing carbonate agglomeration.

[0045] The remaining technical features in the embodiments can be flexibly selected by those skilled in the art according to actual conditions to meet different specific actual needs. However, it is obvious to those skilled in the art that the specific details are not necessarily used to implement the present application. In other examples, in order to avoid confusion of the present application, well-known components, structures or parts are not specifically described, and are within the technical scope defined in the claims of the present application.

[0046] Changes and variations made by those skilled in the art without departing from the spirit and scope of the present application shall be within the scope of protection of the appended claims of the present application. In the above description, a large number of specific details are set forth in order to provide a thorough understanding of the present application. However, it is obvious to those skilled in the art that the present application does not necessarily have to be implemented with these specific details. In other examples, in order to avoid confusion of the present application, well-known technologies, such as specific construction details, operating conditions and other technical conditions, are not specifically described.

Claims

1. An incinerator for treating wastewater containing high levels of organic salts, characterized in that: The furnace body includes, from top to bottom, a high-temperature combustion section, a mixing and cooling section I, a heat exchange tube cooling and rectification section, a carbonate particle separation section, a flue gas return section, and a mixing and cooling section II. A burner is located at the top of the furnace body, and an atomizer is installed on the furnace body corresponding to the burner. The nozzle of the atomizer extends into the furnace body at a certain angle to the central axis of the furnace body. A protective plate is installed inside the furnace body below the atomizer. The mixing and cooling section I includes a nozzle I installed on the furnace body for external connection to low-temperature flue gas. Below the nozzle I... The furnace body is equipped with heat exchange tubes arranged perpendicular to the flue gas flow direction within the furnace body. The furnace body diameter increases below the heat exchange tubes. A gas-solid separator is installed within the furnace body below the heat exchange tubes. A flue gas return device is installed within the furnace body below the gas-solid separator. An annular groove is formed between the flue gas return device and the inner wall of the furnace body. Flue gas holes are provided on the furnace body near the annular groove to guide the flue gas containing lean carbonate particles into the subsequent waste heat recovery unit. A nozzle II is installed in the mixing and cooling section II at the bottom of the furnace body. A carbonate conveyor is installed at the bottom of the furnace body.

2. An incinerator for treating wastewater containing high organic salts according to claim 1, characterized in that: The nozzle I and / or the nozzle II are arranged in a ring in the furnace body, and the distance between the nozzle I and the atomizer ensures that the atomized wastewater sprayed by the atomizer stays in the furnace body between them for more than 2 seconds.

3. An incinerator for treating wastewater containing high organic salts according to claim 1, characterized in that: The distance between the heat exchange tube and the nozzle I ensures that dioxins can undergo high-temperature oxidative decomposition.

4. An incinerator for treating wastewater containing high organic salts according to claim 1, characterized in that: An annular groove is formed between the flue gas return device and the inner wall of the furnace body to allow the entry of flue gas with lean carbonate particles, and a carbonate collection cone is provided in the flue gas return device.

5. An incinerator for treating wastewater containing high organic salts according to claim 1, characterized in that: The incinerator is a micro-negative pressure furnace with a high-temperature resistant lining; the burner is a multi-gun horizontal flow burner with low-NOx burners; the protection plate is an Inconel 625 alloy protection plate; the heat exchange tubes are bare tubes, finned tubes, or turbulence-enhanced heat transfer tubes; the gas-solid separator is a triangular cone structure, a cyclone separator structure, or a bell mouth structure; and the carbonate conveyor is a carbonate slag crushing and screw conveyor.

6. An incinerator for treating wastewater containing high organic salts according to claim 1, characterized in that: The nozzle I and / or the nozzle II adopt a ring tube with several side holes, and molten salt guide tubes are provided on the side holes.

7. An incinerator for treating wastewater containing high organic salts according to claim 1, characterized in that: A gas guide ring pipe is provided between the gas-solid separator and the flue gas return device.

8. An incinerator for treating wastewater containing high organic salts according to claim 1, characterized in that: The upper part of the annular groove is provided with an upper cover plate with slots or holes for the passage of flue gas containing lean carbonate particles, and a lower cover plate with several rows of holes or slots for carbonate particles.

9. An incinerator for treating wastewater containing high organic salts according to claim 1, characterized in that: The flue gas return device includes a carbonate collecting cone at the top, a vertical pipe arranged along the central axis of the furnace body below the carbonate collecting cone, an opening at the bottom of the vertical pipe extending to the mixing and cooling section II, and multiple obliquely arranged flue gas branches at the upper end of the vertical pipe. The two ends of the flue gas branches are respectively connected to the vertical pipe and the annular groove, forming a flue gas return channel from the mixing and cooling section II to the annular groove.

10. An incinerator for treating wastewater containing high organic salts according to claim 1, characterized in that: The gas-solid separator has a triangular pyramidal structure, and the inner diameter of the furnace body increases accordingly to the position of the gas-solid separator.

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