Thermal oxidation furnace and thermal oxidation process

Abstract

The application discloses a thermal oxidation furnace and a thermal oxidation process. The thermal oxidation furnace comprises a combustion zone and a cooling zone connected in sequence from top to bottom; the bottom of the combustion zone is provided with a Venturi extension pipe extending to the lower part of the cooling zone; the combustion zone comprises a burner and a combustion chamber from top to bottom, the burner is used for igniting the waste gas and oxidant delivered to the thermal oxidation furnace and then delivering them to the combustion chamber; the cooling zone comprises a cooling liquid spraying end, the cooling liquid spraying end is arranged at the connection between the combustion zone and the cooling zone and is in communication with the nested space formed by the cooling zone and the Venturi extension pipe; the thermal oxidation furnace is also provided with a circulating flue gas pipe; the first port of the circulating flue gas pipe is arranged in the cooling zone and is in communication with the nested space, and the second port of the circulating flue gas pipe is arranged at the inlet of the combustion chamber. The thermal oxidation furnace can reduce the generation of NO x , effectively prevent the ablation of the Venturi extension pipe, and the product treated by the thermal oxidation furnace can be directly discharged after subsequent cooling treatment.

Description

Technical Field

[0001] This invention relates to a thermal oxidation furnace and a thermal oxidation process. Background Technology

[0002] With the rapid development of industrialization, the amount of waste discharged from various production facilities has increased, causing pollution to the environment and even endangering people's health.

[0003] Thermal oxidation combustion technology can destroy harmful components in waste liquids and gases. During thermal oxidation, pollutants react with oxygen at a specific temperature. The products of this chemical reaction are harmless substances (carbon dioxide, water vapor, and heat). Conventional thermal oxidizers are separate combustion chambers where waste gas or liquid reacts with air. The waste is oxidized and decomposed at high temperatures, and subsequent harmless treatment is carried out in other equipment to meet environmental protection requirements. However, this method involves a large number of devices and a complex process.

[0004] Patent document CN209343792U discloses a process system for treating radioactive organic waste. In this system, the thermal oxidizer and submerged scrubber are connected in a thermal oxidizer furnace. The gas after thermal oxidation undergoes rapid cooling and scrubbing in a cooling chamber to remove acidic gases, allowing for safe discharge of the waste gas. While this system enables simultaneous thermal oxidation combustion and treatment of hazardous substances within the thermal oxidizer furnace, it suffers from difficulties in controlling oxygen content and combustion temperature, and is prone to generating NO. x Furthermore, the venturi extension tube is prone to erosion, which adversely affects the service life of the thermal oxidizer and the subsequent processes. Summary of the Invention

[0005] This invention addresses the problem in existing thermal oxidizers where oxygen content and combustion temperature are difficult to control, leading to the easy generation of NO. x To address the drawback of easily eroded Venturi extension tubes, this invention provides a thermal oxidizer and thermal oxidation process. The thermal oxidizer of this invention, through the arrangement of a circulating flue gas pipe and a coolant spray end, ensures thorough mixing of the circulating flue gas with the ignited waste gas, thereby reducing the flue gas temperature and decreasing NO₂ levels. x The generation of [a specific substance] effectively prevents the Venturi extension tube from burning due to excessive temperature, resulting in a long service life. The products treated by the thermal oxidation furnace meet national emission standards and can be directly discharged after subsequent cooling treatment.

[0006] The present invention solves the above-mentioned technical problems through the following technical solutions.

[0007] This invention provides a thermal oxidation furnace The feature is that it includes a combustion zone and a cooling zone connected sequentially from top to bottom; the bottom of the combustion zone is provided with a Venturi extension tube extending into the lower part of the cooling zone;

[0008] The combustion zone includes a burner and a combustion chamber from top to bottom. The burner is used to ignite the waste gas and oxidant that are fed into the thermal oxidizer before feeding them into the combustion chamber.

[0009] The cooling zone includes a coolant spray end, which is located at the connection between the combustion zone and the cooling zone and communicates with the nested space formed by the cooling zone and the Venturi extension tube.

[0010] The thermal oxidizer is also equipped with a circulating flue gas pipe for collecting the washed and cooled flue gas and circulating it to the combustion chamber; the first port of the circulating flue gas pipe is located in the cooling zone and communicates with the nested space, and the second port of the circulating flue gas pipe is located at the entrance of the combustion chamber.

[0011] In this invention, the waste gas to be treated and the oxidant are completely combusted in the combustion chamber. The waste gas to be treated contains various combustible components, sulfur, and ash. The products generated after the combustion of the waste gas and the oxidant include carbon dioxide, water, and sulfides. After the combustion products are washed and cooled in the cooling zone, the washed and cooled flue gas is recovered and transported as circulating flue gas to the inlet of the combustion chamber. The mixing of the circulating flue gas with the ignited waste gas not only reduces the combustion temperature, but also, because the circulating flue gas has a low oxygen content, the oxygen content in the ignited waste gas can be controlled after mixing, thereby effectively suppressing NO. x The generation of .

[0012] In this invention, preferably, the length of the combustion chamber should ensure that the residence time of the exhaust gas to be treated in the combustion chamber is greater than 2 seconds.

[0013] In this invention, preferably, the top of the burner is also provided with an inlet for the exhaust gas to be treated and an inlet for the oxidant.

[0014] In this invention, preferably, the circulating flue gas pipe includes a circulating flue gas ring pipe and a plurality of circulating flue gas branch pipes; the inlet end of the circulating flue gas ring pipe is the first port of the circulating flue gas pipe, and the outlet ends of the plurality of circulating flue gas branch pipes are the second ports of the circulating flue gas pipe; the outlet ends of the plurality of circulating flue gas ring pipes are correspondingly connected to the inlet ends of the plurality of circulating flue gas branch pipes.

[0015] Preferably, the angle between the axis of the circulating flue gas branch pipe and the horizontal plane is 30-60°.

[0016] Preferably, the sum of the total cross-sectional areas of the circulating flue gas branch pipes is less than the cross-sectional area of ​​the circulating flue gas ring pipe.

[0017] Preferably, several of the circulating flue gas branch pipes are evenly distributed at the inlet of the combustion chamber.

[0018] Preferably, the number of some of the circulating flue gas branch pipes is 4 to 12, for example, 6 or 8.

[0019] In this invention, the alkaline solution containing NaOH and other substances in the cooling zone reacts with sulfur-containing substances in the combustion products to generate salts such as sodium sulfate, calcium sulfate, and calcium carbonate, thereby absorbing sulfides in the flue gas to meet emission standards.

[0020] In this invention, preferably, the thermal oxidation furnace is further provided with a coolant spray pipe, which includes a coolant ring pipe and several coolant branch pipes;

[0021] The coolant ring pipe is sleeved outside the furnace body of the thermal oxidizer. The inlet end of the coolant ring pipe is connected to the coolant source, and the outlet ends of the plurality of coolant ring pipes are connected to the plurality of coolant branch pipes.

[0022] Several cooling liquid branch pipes pass through the side wall of the thermal oxidation furnace and are located within the nested space, with the outlet ends of the cooling liquid branch pipes serving as the cooling liquid spray ends.

[0023] Preferably, the number of coolant spray ends is 4 to 12, for example, 6 or 8.

[0024] Preferably, the coolant spray nozzles are evenly distributed at the junction of the combustion zone and the cooling zone.

[0025] Preferably, the coolant branch pipe is a folded pipe, and the coolant branch pipe is folded at least twice within the nested space.

[0026] Preferably, the angle between the end axis of the coolant branch pipe and the horizontal plane is 30-60°.

[0027] In this invention, preferably, the thermal oxidizer includes a shell, and the combustion chamber and the cooling zone are located inside the shell, forming an integrated structure. This can effectively ensure the sealing and reliability of the thermal oxidizer, while reducing the number of post-processing equipment and improving process efficiency.

[0028] Preferably, the shell is made of carbon steel.

[0029] Preferably, the sidewall of the combustion chamber is made of multi-layered refractory material.

[0030] Preferably, the refractory material of the inner combustion chamber is a low-silicon corundum castable, and the refractory material of the outer combustion chamber is a heat-insulating castable.

[0031] Preferably, the refractory material at the combustion chamber outlet is made of low-silicon corundum brick.

[0032] In this invention, preferably, the inner wall of the combustion chamber is provided with an annular protrusion structure, which can increase the disturbance of the exhaust gas and oxidant in the combustion chamber, so as to fully mix the exhaust gas and oxidant.

[0033] Preferably, the annular protrusion structure is located in the middle of the combustion chamber.

[0034] In this invention, preferably, the bottom of the combustion chamber is further provided with a base plate for supporting the refractory material and the Venturi extension tube.

[0035] In this invention, the length of the Venturi extension tube generally needs to ensure that the outlet of the Venturi extension tube is located at a certain height below the liquid surface in the cooling zone. Combustion products enter the cooling zone through the Venturi extension tube, where they are rapidly cooled to prevent the formation of dioxins and furans from incompletely oxidized organic matter, and to maximize the absorption of acidic gases and the washing of soot. In addition, the coolant spray end can also effectively prevent the Venturi extension tube from being ablated by the high-temperature combustion products.

[0036] In this invention, preferably, the lower part of the Venturi extension tube is fixed to the inner wall of the cooling zone by four angle steels.

[0037] In this invention, preferably, the thermal oxidation furnace is further provided with a demineralized water inlet, which is located below the cooling zone.

[0038] Preferably, the thermal oxidizer is further provided with an alkali inlet, which is located below the cooling zone.

[0039] Preferably, the thermal oxidizer is also provided with a nitrogen purging port, which is located below the cooling zone. The nitrogen purging port and the flue gas outlet are not on the same plane and are set at an angle of any size to ensure that the medium inside the thermal oxidizer can be completely replaced when starting and stopping.

[0040] Preferably, the thermal oxidizer is also provided with an alkali outlet, which is located at the bottom of the cooling zone. The alkali outlet is cooled and then recycled. When the salt concentration in the alkali reaches a set value, a portion is discharged while fresh alkali is added.

[0041] In this invention, preferably, the thermal oxidation furnace is also provided with a manhole, which is located below the cooling zone and is used for maintenance.

[0042] The present invention also provides a thermal oxidation process, which is carried out using the thermal oxidation furnace as described above; it includes the following: step:

[0043] S1. The waste gas to be treated and the oxidant are delivered to the burner for ignition, and mixed and burned with the circulating flue gas in the combustion chamber to obtain combustion products;

[0044] S2. The coolant is delivered to the cooling zone, the combustion products are delivered to the cooling zone through the Venturi extension tube, the washed and cooled flue gas is collected, and the flue gas is circulated back to the combustion chamber or discharged as the circulating flue gas.

[0045] In this invention, the oxidant can be a conventional oxidant in the art, such as air or oxygen.

[0046] In this invention, the flow rate of circulating flue gas can be adjusted according to the combustion status of the waste gas to be treated and the oxidant.

[0047] Preferably, the circulating flue gas recirculated to the combustion chamber accounts for 0 to 30% of the volume of the collected scrubbed and cooled flue gas.

[0048] In this invention, preferably, the combustion temperature of the combustion chamber is above 1000°C, for example, 1000 to 1150°C.

[0049] In this invention, preferably, the oxygen content of the flue gas after combustion in the combustion chamber is 6%.

[0050] In this invention, by controlling the flow rate of the coolant, a liquid film is formed on the Venturi extension tube, which cools the combustion products while protecting the Venturi extension tube from being burned by the combustion products.

[0051] In this invention, preferably, the alkaline solution in the cooling zone is an alkaline solution containing NaOH.

[0052] In this invention, preferably, the coolant comprises sodium carbonate and / or sodium sulfate.

[0053] In this invention, preferably, the washing solution is desalinated water with a pH of 6.5–7.2 (25°C), a conductivity of 0.2 μS / cm (25°C), a hardness (as CaCO3) of ≈0 μmol / L, and a SiO2 content of ≤20 μg / L.

[0054] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0055] The reagents and raw materials used in this invention are all commercially available.

[0056] The positive and progressive effects of this invention are as follows:

[0057] The thermal oxidizer of this invention, through the arrangement of a circulating flue gas pipe and a coolant spray end, ensures thorough mixing of the circulating flue gas and the ignited waste gas to be treated, thereby reducing the flue gas temperature and decreasing NO levels. xThe generation of [a specific substance] effectively prevents the Venturi extension tube from burning due to excessive temperature, resulting in a long service life. The products treated by the thermal oxidation furnace meet national emission standards and can be directly discharged after subsequent cooling treatment. Attached Figure Description

[0058] Figure 1 This is a schematic diagram of the thermal oxidation furnace in Example 1.

[0059] Explanation of reference numerals in the attached figures

[0060] Combustion Zone 1

[0061] Cooling Zone 2

[0062] Venturi extension tube 3

[0063] Burner 4

[0064] Combustion Chamber 5

[0065] Coolant spray end 6

[0066] Circulating flue gas pipe 7

[0067] First port 8

[0068] Waste gas inlet 9

[0069] Oxidizing agent inlet 10

[0070] Coolant branch pipe 11

[0071] 12 ring-shaped protrusions

[0072] Base plate 13

[0073] Angle steel 14

[0074] Desalinated water inlet 15

[0075] Alkali inlet 16

[0076] Nitrogen purging port 17

[0077] 18 alkali outlet

[0078] Manhole 19

[0079] Nested space 20 Detailed Implementation

[0080] The present invention is further illustrated below by way of examples, but the invention is not limited to the scope of these examples. Experimental methods not specifically described in the following examples are performed according to conventional methods and conditions, or as selected according to the product instructions.

[0081] Example 1

[0082] like Figure 1As shown, Embodiment 1 provides a thermal oxidizer, which includes a combustion zone 1 and a cooling zone 2 connected sequentially from top to bottom. The bottom of the combustion zone 1 is provided with a Venturi extension pipe 3 extending towards the lower part of the cooling zone 2. The combustion zone 1 includes a burner 4 and a combustion chamber 5 from top to bottom. The burner 4 is used to ignite the waste gas and oxidant supplied to the thermal oxidizer before supplying them to the combustion chamber 5. The cooling zone 2 includes a coolant spray end 6, which is located at the connection between the combustion zone 1 and the cooling zone 2 and communicates with the nested space 20 formed by the cooling zone 2 and the Venturi extension pipe 3. The thermal oxidizer also includes a circulating flue gas pipe 7, used to collect the washed and cooled flue gas and circulate it to the combustion chamber 5. The first port 8 of the circulating flue gas pipe 7 is located in the cooling zone 2 and communicates with the nested space 20, and the second port of the circulating flue gas pipe 7 is located at the inlet of the combustion chamber 5. The sum of the total cross-sectional areas of the circulating flue gas branch pipes is less than the cross-sectional area of ​​the circulating flue gas ring pipe.

[0083] The length of combustion chamber 5 is the length in which the exhaust gas has a residence time of more than 2 seconds within combustion chamber 5.

[0084] The burner 4 is also equipped with a waste gas inlet 9 and an oxidant inlet 10 at the top.

[0085] The circulating flue gas pipe 7 includes a circulating flue gas ring pipe and 12 circulating flue gas branch pipes. The inlet end of the circulating flue gas ring pipe is the first port 8 of the circulating flue gas pipe 7, and the outlet ends of the 12 circulating flue gas branch pipes are the second ports of the circulating flue gas pipe 7. The outlet ends of the 12 circulating flue gas ring pipes are connected to the inlet ends of the 12 circulating flue gas branch pipes. The angle between the axis of the circulating flue gas branch pipe and the horizontal plane is 30° to 60°. The 12 circulating flue gas branch pipes are evenly distributed at the inlet of the combustion chamber 5. The inner diameter of the circulating flue gas branch pipes is smaller than the inner diameter of the circulating flue gas ring pipe.

[0086] The thermal oxidizer is also equipped with a coolant spray pipe, which includes a coolant ring pipe and six coolant branch pipes. The coolant ring pipe is sleeved outside the furnace body of the thermal oxidizer. The inlet end of the coolant ring pipe is connected to the coolant source, and the outlet ends of the six coolant ring pipes are connected to the six coolant branch pipes 11. The six coolant branch pipes 11 pass through the side wall of the thermal oxidizer and are located in the nested space 20. The outlet ends of the six coolant branch pipes 11 are the coolant spray ends 6.

[0087] The coolant spray nozzles 6 are evenly distributed at the junction of the combustion zone 1 and the cooling zone 2. The coolant branch pipe 11 is a folded pipe, and the coolant branch pipe 11 is folded at least twice within the nested space 20. The angle between the end axis of the coolant branch pipe 11 and the horizontal plane is 30° to 60°.

[0088] The thermal oxidation furnace includes a shell, a combustion chamber 5 and a cooling zone 2 located inside the shell, forming an integrated structure.

[0089] The shell is made of carbon steel. The sidewalls of combustion chamber 5 are made of multi-layered refractory material. The inner layer of refractory material in combustion chamber 5 is made of low-silicon corundum castable, and the outer layer of refractory material in combustion chamber 5 is made of insulating castable. The refractory material at the outlet of combustion chamber 5 is made of low-silicon corundum brick.

[0090] The inner wall of the combustion chamber 5 is provided with an annular protrusion structure 12, which is located in the middle of the combustion chamber 5.

[0091] The bottom of the combustion chamber 5 is also provided with a base plate 13 to support the refractory material and the Venturi extension tube 3.

[0092] The length of the Venturi extension tube 3 needs to ensure that the outlet of the Venturi extension tube 3 is located at a certain height below the liquid surface in the cooling zone 2. The lower part of the Venturi extension tube 3 is fixed to the inner wall of the cooling zone 2 by four angle steels 14.

[0093] The thermal oxidizer is also equipped with a demineralized water inlet 15, which is located below the cooling zone 2.

[0094] The thermal oxidizer is also equipped with an alkali inlet 16, which is located below the cooling zone 2.

[0095] The thermal oxidizer is also equipped with a nitrogen purging port 17, which is located below the cooling zone 2 and is not on the same plane as the flue gas outlet. It is set at an angle of any size.

[0096] The thermal oxidizer is also equipped with an alkali outlet 18, which is located at the bottom of the cooling zone.

[0097] The thermal oxidizer is also equipped with a manhole 19, which is located below the cooling zone 2 and is used for maintenance.

[0098] Example 1

[0099] The thermal oxidation process was carried out using the thermal oxidation furnace of Example 1.

[0100] S1. The waste gas to be treated, containing combustible gas and H2S gas, and air are transported to burner 4 for ignition, and mixed and burned with circulating flue gas in combustion chamber 5. The combustion temperature of combustion chamber 5 is ~1150℃, and the combustion products are obtained with an oxygen content of ~6%.

[0101] S2. The coolant is transported to the cooling zone 2. The combustion products in S1 are transported to the cooling zone 2 through the Venturi extension tube 3. The cooling zone 2 contains NaOH solution and sodium carbonate coolant. The flue gas after washing and cooling is collected and circulated to the combustion chamber 5 as circulating flue gas. The circulating flue gas accounts for ~30% of the volume of the flue gas after washing and cooling.

[0102] The flue gas recovered after treatment in the thermal oxidizer does not contain combustible gases, H2S meets emission standards, and NO... x <250mg / Nm 3 .

Claims

1. A thermal oxidation furnace, characterized in that, It includes a combustion zone and a cooling zone connected sequentially from top to bottom; the bottom of the combustion zone is provided with a Venturi extension tube extending into the lower part of the cooling zone; The combustion zone includes a burner and a combustion chamber from top to bottom. The burner is used to ignite the waste gas and oxidant that are fed into the thermal oxidizer before feeding them into the combustion chamber. The cooling zone includes a coolant spray end, which is located at the connection between the combustion zone and the cooling zone and communicates with the nested space formed by the cooling zone and the Venturi extension tube. The thermal oxidizer is also equipped with a circulating flue gas pipe for collecting the washed and cooled flue gas and circulating it to the combustion chamber; The first port of the circulating flue gas pipe is located in the cooling zone and communicates with the nested space, and the second port of the circulating flue gas pipe is located at the entrance of the combustion chamber; The circulating flue gas pipe includes a circulating flue gas ring pipe and a plurality of circulating flue gas branch pipes; the inlet end of the circulating flue gas ring pipe is the first port of the circulating flue gas pipe, and the outlet end of the plurality of circulating flue gas branch pipes is the second port of the circulating flue gas pipe; the outlet end of the plurality of circulating flue gas ring pipes is correspondingly connected to the inlet end of the plurality of circulating flue gas branch pipes. The sum of the total cross-sectional areas of the circulating flue gas branch pipes is less than the cross-sectional area of ​​the circulating flue gas ring pipe; The inner wall of the combustion chamber is provided with an annular protrusion structure, which is located in the middle of the combustion chamber and below the outlet end of the circulating flue gas branch pipe.

2. The thermal oxidation furnace as described in claim 1, characterized in that, The length of the combustion chamber is the length in which the residence time of the treated exhaust gas in the combustion chamber is greater than 2 seconds; The burner is also equipped with an inlet for the exhaust gas to be treated and an inlet for the oxidant at the top.

3. The thermal oxidation furnace as described in claim 1, characterized in that, The angle between the axis of the circulating flue gas branch pipe and the horizontal plane is 30~60°.

4. The thermal oxidation furnace as described in claim 1, characterized in that, Several circulating flue gas branch pipes are evenly distributed at the inlet of the combustion chamber; And / or, the number of some of the circulating flue gas branch pipes is 4 to 12.

5. The thermal oxidation furnace as described in claim 4, characterized in that, The number of circulating flue gas branch pipes is 6 or 8.

6. The thermal oxidation furnace as described in claim 1, characterized in that, The thermal oxidizer is also equipped with a coolant spray pipe, which includes a coolant ring pipe and several coolant branch pipes; The coolant ring pipe is sleeved outside the furnace body of the thermal oxidizer. The inlet end of the coolant ring pipe is connected to the coolant source, and the outlet ends of the plurality of coolant ring pipes are connected to the plurality of coolant branch pipes. Several cooling liquid branch pipes pass through the side wall of the thermal oxidation furnace and are located within the nested space, with the outlet ends of the cooling liquid branch pipes serving as the cooling liquid spray ends.

7. The thermal oxidation furnace as described in claim 6, characterized in that, The number of coolant spray ends is 4 to 12; The coolant spray nozzles are evenly distributed at the junction of the combustion zone and the cooling zone; The coolant branch pipe is a folded pipe, and the coolant branch pipe is folded at least twice within the nested space; The angle between the end axis of the coolant branch pipe and the horizontal plane is 30~60°.

8. The thermal oxidation furnace as described in claim 7, characterized in that, The number of coolant spray ends is 6 or 8.

9. The thermal oxidation furnace as described in claim 1, characterized in that, The thermal oxidation furnace includes a shell, and the combustion zone and cooling zone are located inside the shell; The sidewalls of the combustion chamber are made of multi-layered refractory material.

10. The thermal oxidation furnace as described in claim 9, characterized in that, The shell is made of carbon steel; And / or, the refractory material of the inner combustion chamber is low-silicon corundum castable, and the refractory material of the outer combustion chamber is heat-insulating castable; And / or, the refractory material at the combustion chamber outlet is made of low-silicon corundum brick.

11. The thermal oxidation furnace as described in claim 1, characterized in that, The bottom of the combustion chamber is also provided with a base plate; The lower part of the Venturi extension tube is fixed to the inner wall of the cooling zone by four angle steels.

12. The thermal oxidation furnace as described in claim 1, characterized in that, The thermal oxidation furnace is also provided with a demineralized water inlet, which is located below the cooling zone; The thermal oxidation furnace is also equipped with a nitrogen purging port, which is located below the cooling zone; The thermal oxidizer is also provided with an alkali inlet, which is located below the cooling zone; The thermal oxidizer is also provided with an alkali solution outlet, which is located at the bottom of the cooling zone; The thermal oxidation furnace is also equipped with a manhole, which is located below the cooling zone.

13. A thermal oxidation process, characterized in that, It is carried out using a thermal oxidation furnace as described in any one of claims 1 to 12; it includes the following steps: S1. The waste gas to be treated and the oxidant are delivered to the burner for ignition, and mixed and burned with the circulating flue gas in the combustion chamber to obtain combustion products; S2. The coolant is delivered to the cooling zone, the combustion products are delivered to the cooling zone through the Venturi extension tube, the washed and cooled flue gas is collected, and the flue gas is circulated back to the combustion chamber as the circulating flue gas.

14. The thermal oxidation process as described in claim 13, characterized in that, The oxidizing agent is air or oxygen; And / or, the circulating flue gas accounts for 30% of the volume of the scrubbed and cooled flue gas; And / or, the combustion temperature of the combustion chamber is above 1000°C; And / or, the oxygen content of the flue gas after combustion in the combustion chamber is 6%; And / or, the alkaline solution in the cooling zone is an alkaline solution containing NaOH; And / or, the coolant contains sodium carbonate and / or sodium sulfate.

15. The thermal oxidation process as described in claim 14, characterized in that, The combustion temperature in the combustion chamber is 1000~1150℃.

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