Plasma gasification furnace

Abstract

The invention discloses a plasma gasification furnace, and relates to the technical field of solid hazardous waste treatment. A plasma gasification furnace comprises a molten pool section used for containing radioactive waste and melting the radioactive waste under the external heating condition; the melting section is fixedly connected with the molten pool section and used for bearing the molten radioactive waste solution; the gasification section is fixedly connected with the melting section and is used for accommodating the radioactive waste solution for pyrolysis and gasification; the molten pool section and the melting section are both formed by laying large bricks; the large brick of the molten pool section comprises the following raw materials in parts by weight: 40-70 parts of electric smelting chromium oxide, 15-45 parts of corundum, 4-8 parts of aluminum oxide micro powder, 2-6 parts of chromium oxide micro powder, 3-7 parts of a binding agent and 0.05-0.15 part of an additive. The plasma gasification furnace solves the problems that the plasma gasification furnace is not resistant to corrosion, low in reliability and short in service life.

Description

Technical Field

[0001] The invention relates to the technical field of solid hazardous waste treatment, and in particular to a plasma gasification furnace. Background Art

[0002] With the continuous development of nuclear power in my country, the total amount of radioactive waste generated by the operation and decommissioning of nuclear power plants in the future will continue to increase. The research and development of high-volume reduction and volume reduction treatment technologies for nuclear waste has become one of the main driving forces and challenges for nuclear safety. Compared with traditional treatment technologies, plasma glass solidification technology has the advantages of wide application range, fast reaction speed, low secondary pollution, small tail gas volume and compact equipment. It can realize the decomposition and gasification combustion of organic waste, high-temperature melting of inorganic waste and solidification of radioactive nuclides in one system, greatly reducing the volume of waste and obtaining a stable final waste body.

[0003] Plasma glass solidification technology can be applied to the treatment of nuclear power plants, nuclear facility operations and decommissioning waste. The engineering application of this technology will provide a new way for the treatment and disposal of radioactive waste. At present, domestic plasma glass solidification technology is mainly used in civilian projects, such as medical waste and fly ash disposal, and there are relatively few plasma furnaces for treating radioactive waste. At present, there are no plasma treatment projects for radioactive waste in China, and they are basically in the research or small-scale test and pilot stage. In addition, there are many problems in the use of existing plasma furnaces: 1. During the melting of the glass body, the temperature of the molten pool area is high and the corrosiveness is strong, resulting in serious erosion in the area where the liquid phase molten pool contacts the refractory material, and the refractory material is seriously detached and corroded; 2. Plasma furnaces are usually designed for intermittent overflow discharge. As the material in the molten pool continues to increase, the liquid level continues to rise, and the liquid level continues to drop during the discharge process. Therefore, the slag line area (the area covered by the liquid level floating up and down) faces the risk of solid-liquid-gas three-phase, and the design and operation are very difficult; 3. The problem of damage to refractory materials by radioactive nuclides, etc. These phenomena will seriously affect the use effect of the plasma furnace in actual engineering use, and may even cause the radioactive waste treatment equipment to be shut down for maintenance or even scrapped.

[0004] Therefore, there is an urgent need to provide a plasma gasification furnace with high corrosion resistance, high reliability and long service life. Summary of the invention

[0005] The technical problem to be solved by the present invention is that a plasma gasification furnace is not resistant to corrosion, has low reliability and a short service life. The purpose is to provide a plasma gasification furnace that solves the problems of a plasma gasification furnace being not resistant to corrosion, has low reliability and a short service life.

[0006] The present invention is achieved through the following technical solutions:

[0007] A plasma gasification furnace, comprising

[0008] The molten pool section is used to contain the radioactive waste and melt the radioactive waste under external heating conditions;

[0009] The melting section is fixedly connected to the melting pool section and is used to carry the molten radioactive waste solution;

[0010] The gasification section is fixedly connected to the melting section and is used to accommodate the pyrolysis and gasification of the radioactive waste solution;

[0011] The molten pool section and the melting section are both built with large bricks;

[0012] The large bricks of the molten pool section include the following raw materials by weight:

[0013] 40-70 parts of fused chromium oxide, 15-45 parts of corundum, 4-8 parts of alumina powder, 2-6 parts of chromium oxide powder, 3-7 parts of binder and 0.05-0.15 parts of additives.

[0014] As a possible design, the large bricks of the above-mentioned molten pool section include the following raw materials in parts by weight:

[0015] 60-65 parts of fused chromium oxide, 18-30 parts of corundum, 5-7 parts of alumina powder, 3-5 parts of chromium oxide powder, 4-6 parts of binder and 0.08-0.13 parts of additives.

[0016] As a possible design, the large brick of the above-mentioned melting section includes the following raw materials in parts by weight: 75-85 parts of corundum, 2-8 parts of zirconium oxide, 4-8 parts of chromium oxide powder, 2-6 parts of aluminum oxide powder, 3-7 parts of binder and 0.05-0.15 parts of additives.

[0017] As a possible design, the large brick of the above-mentioned melting section includes the following raw materials in parts by weight: 78-83 parts of corundum, 3-7 parts of zirconium oxide, 5-7 parts of chromium oxide powder, 3-5 parts of aluminum oxide powder, 4-6 parts of binder and 0.08-0.13 parts of additives.

[0018] As a possible design, the length of the large brick is 500-1000 mm, the width of the large brick is 300-500 mm, and the thickness of the large brick is 200-300 mm.

[0019] As a possible design, the inner walls of the molten pool section, melting section and gasification section are all coated with a refractory layer.

[0020] As a possible design, the large bricks of the above-mentioned molten pool section are prepared by the following method:

[0021] Mixing various raw materials to prepare a molding material;

[0022] Pressing the molding material into a shape to obtain a primary embryo;

[0023] The primary embryo is fired and formed to obtain large bricks of the molten pool section.

[0024] As a possible design, the above-mentioned firing specifically includes placing the embryo in an atmosphere with an oxygen content of 2-3%, firing at 1610-1625° C. for 6-9 hours, and then keeping the temperature for 5-10 hours.

[0025] As a possible design, the large brick of the above-mentioned melting section is prepared by the following method:

[0026] Mixing various raw materials to prepare a molding material;

[0027] Pressing the molding material into a shape to obtain a primary embryo;

[0028] The primary embryo is fired and formed to obtain a large molten brick.

[0029] As a possible design, the above firing specifically includes placing the embryo in an atmosphere with an oxygen content of 2-4%, firing at 1630-1650° C. for 6-9 hours, and then keeping the temperature for 5-10 hours.

[0030] When the plasma gasification furnace of the present invention is in use, the radioactive waste is heated and melted in the molten pool section. At this time, the temperature of the molten pool section and the melting section is as high as 1200-1500°C. The radioactive waste is melted into liquid, and the silicon calcium and other components therein form a glass liquid layer here; some metals such as iron, copper, silver and the like have a relatively large density and are deposited at the bottom, and a stratification phenomenon occurs in the molten pool section; and the liquid radioactive waste is pyrolyzed and gasified at high temperature to form combustible gas to be discharged from the gasification section. At this time, the temperature of the gasification section is as high as 600-800°C.

[0031] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0032] The present invention adopts whole large-size bricks for prefabrication without brick joints. In addition to avoiding the life of refractory materials and safety risks caused by too many brick joints, the present invention also forms a modular design and construction of the whole piece during the masonry production process. Once damage is found during use, it can be quickly disassembled and replaced in a modular manner without the need to shut down the furnace for maintenance as in the traditional mode, thus saving time and improving efficiency.

[0033] The present invention uses corundum, aluminum oxide powder, chromium oxide powder, binder, additive and fused chromium oxide as raw materials to prepare the molten pool section, so that the molten pool section can withstand the high temperature of 1500°C and the corrosion of radioactive waste, thereby ensuring that the plasma gasification furnace is not easy to fall off and corrode during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0035] Figure 1 It is a schematic structural diagram of the plasma gasification furnace of the present invention;

[0036] Figure 2 It is a schematic diagram of the partial structure of the plasma gasification furnace of the present invention;

[0037] Figure 3 This is an internal diagram of a large furnace brick of a plasma gasification furnace according to Example 1 of the present invention;

[0038] Figure 4 This is an internal view of a large furnace brick of a plasma gasification furnace of Comparative Example 1 of the present invention;

[0039] Figure 5 This is an internal view of the large bricks in the plasma gasification furnace of comparative example 2 of the present invention.

[0040] Marks and corresponding parts names in the attached drawings:

[0041] 1-molten pool section, 2-melting section, 3-gasification section. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with Examples and accompanying drawings. The illustrative embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention. If specific conditions are not specified in the examples, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0043] A plasma gasification furnace, referring to Figures 1-2 ,include

[0044] The molten pool section 1 is used to contain the radioactive waste and melt the radioactive waste under external heating conditions;

[0045] The molten section 2 is fixedly connected to the molten pool section 1 and is used to carry the molten radioactive waste solution;

[0046] The gasification section 3 is fixedly connected to the melting section 2 and is used to accommodate the pyrolysis and gasification of the radioactive waste solution;

[0047] Both the molten pool section 1 and the molten section 2 are built with large bricks;

[0048] The large bricks of the molten pool section 2 include the following raw materials in parts by weight:

[0049] 40-70 parts of fused chromium oxide, 15-45 parts of corundum, 4-8 parts of alumina powder, 2-6 parts of chromium oxide powder, 3-7 parts of binder and 0.05-0.15 parts of additives.

[0050] When the raw materials of the molten pool section 2 are fired, new compounds and crystal forms will be generated and transformed, some of which will cause expansion and thus damage the molten pool section materials. By adding a binder, this destructive effect can be prevented and the stability of the molten pool section materials can be improved; moreover, the binder can also eliminate cracks and peeling caused by shrinkage of amorphous refractory materials at high temperatures and during cooling; in addition, the binder can improve the flow phase of the slurry when mixing the raw materials, reduce water seepage, and promote more rapid and uniform hydration of cement particles, which is beneficial to improving the working properties and structure of the molten pool section materials.

[0051] When the additives are mixed with other substances, they can combine the loose refractory raw material particles together to form a structure with a certain strength and integrity, thereby ensuring that the refractory materials will not become loose or broken during production, transportation and use; in the drying process after the materials are mixed and formed, they are given sufficient strength to facilitate subsequent handling and processing; and during high-temperature sintering, some additives will participate in the reaction, which can promote sintering and improve the high-temperature performance and volume stability of the material; and can also improve the microstructure of the refractory material, thereby improving its resistance to thermal shock and temperature changes; it can also improve the performance of the refractory material against chemical erosion and physical wear to a certain extent through interaction with the refractory raw materials.

[0052] Preferably, the raw material of the gasification section can be the material of a conventional gasification section or zirconium-chromium corundum.

[0053] Preferably, the above-mentioned binder includes water glass, phosphate and sol. The binder can make the refractory materials bond to each other to form a structure with certain strength and integrity, ensure that the refractory materials will not loosen or break during production, transportation and use, and participate in chemical reactions to help promote the sintering process of the refractory materials, improve the high temperature performance and volume stability of the materials, and through interaction with the refractory raw materials, to a certain extent improve the performance of the refractory materials in resisting chemical erosion and physical wear.

[0054] Preferably, the binder comprises the following raw materials in weight percentage: 13-16% water glass, 10-15% phosphate, and the remainder is sol.

[0055] Furthermore, the large bricks of the molten pool section include the following raw materials in parts by weight:

[0056] 60-65 parts of fused chromium oxide, 18-30 parts of corundum, 5-7 parts of alumina powder, 3-5 parts of chromium oxide powder, 4-6 parts of binder and 0.08-0.13 parts of additives.

[0057] Preferably, the binder and additives used in the large bricks of the above-mentioned molten pool section are the same as the binder and additives used in the large bricks of the melting section.

[0058] Furthermore, the large bricks of the melting section include the following raw materials in parts by weight: 75-85 parts of corundum, 2-8 parts of zirconium oxide, 4-8 parts of chromium oxide powder, 2-6 parts of aluminum oxide powder, 3-7 parts of binder and 0.05-0.15 parts of additives.

[0059] Furthermore, the large bricks of the melting section include the following raw materials in parts by weight: 78-83 parts of corundum, 3-7 parts of zirconium oxide, 5-7 parts of chromium oxide powder, 3-5 parts of aluminum oxide powder, 4-6 parts of binder and 0.08-0.13 parts of additives.

[0060] Furthermore, the length of the large brick is 500-1000mm, the width of the large brick is 300-500mm, and the thickness of the large brick is 200-300mm. By selecting large bricks of this size, it is possible to prevent the solution from entering the brick joints due to the excessive and dense brick joints between traditional small bricks through the masonry between the large bricks, and then the high-temperature glass solution penetrates into the inner working layer, resulting in the destruction of the refractory structure and aggravated damage to the refractory. In extreme cases, the glass solution completely penetrates the refractory of the inner working layer and enters the middle thermal insulation layer of the refractory. Because the refractory of the insulation layer itself cannot withstand the solution of more than one thousand degrees, the refractory from the middle insulation layer to the outer insulation layer will all be burned through, causing the solution to flow out of the furnace shell, thereby causing a safety accident. The size of the large bricks can effectively block the erosion of the solution, protect the structure of the refractory, avoid damage to the refractory, and extend the service life of the furnace body.

[0061] Furthermore, the inner walls of the molten pool section, the melting section and the gasification section are all coated with a refractory layer. The refractory layer can further improve the refractory performance, thereby extending the service life of the furnace body.

[0062] Further, the large bricks of the molten pool section are prepared by the following method:

[0063] Mixing various raw materials to prepare a molding material;

[0064] Pressing the molding material into a shape to obtain a primary embryo;

[0065] The primary embryo is fired and formed to obtain large bricks of the molten pool section.

[0066] Furthermore, the firing is specifically to place the embryo in an atmosphere with an oxygen content of 2-3%, fire it at 1610-1625° C. for 6-9 hours, and then keep it warm for 5-10 hours.

[0067] Preferably, the pressing pressure is 250-280 MPa.

[0068] Preferably, water is added when the raw materials are mixed to make the molding material have good adhesion and facilitate subsequent compression molding.

[0069] Furthermore, the large bricks of the above-mentioned melting section are prepared by the following method:

[0070] Mixing various raw materials to prepare a molding material;

[0071] Pressing the molding material into a shape to obtain a primary embryo;

[0072] The primary embryo is fired and formed to obtain a large molten brick.

[0073] Furthermore, the firing is specifically to place the embryo in an atmosphere with an oxygen content of 2-4%, fire it at 1630-1650° C. for 6-9 hours, and then keep it warm for 5-10 hours.

[0074] Preferably, the pressing pressure is 250-280 MPa.

[0075] Preferably, water is added when the raw materials are mixed to make the molding material have good adhesion and facilitate subsequent compression molding.

[0076] Example 1

[0077] The large bricks of the melting section include the following raw materials by weight: 80 kg of corundum, 5 kg of zirconium oxide, 6 kg of chromium oxide powder, 4 kg of aluminum oxide powder, 5 kg of binder and 0.1 kg of additives.

[0078] The large bricks in the molten pool section include the following raw materials by weight: 65Kg of fused chromium oxide, 20Kg of corundum, 6Kg of alumina powder, 4Kg of chromium oxide powder, 5Kg of binder and 0.1Kg of additives.

[0079] The large bricks of the molten pool section are prepared by the following method:

[0080] Mixing various raw materials to prepare a molding material;

[0081] The molding material is pressed under a pressure of 250 MPa to obtain a primary embryo;

[0082] The primary embryo was placed in an atmosphere with an oxygen content of 2%, fired at 1610°C for 6 hours, and then kept warm for 5 hours to obtain a large molten pool section brick.

[0083] The large bricks of the molten section are prepared by the following method:

[0084] Mixing various raw materials to prepare a molding material;

[0085] The molding material is pressed under a pressure of 260 MPa to obtain a primary embryo;

[0086] The embryo was placed in an atmosphere with an oxygen content of 2%, fired at 1640°C for 6 hours, and then kept warm for 8 hours to obtain a molten section brick.

[0087] The large bricks of the melting section, the large bricks of the melting pool section and the large bricks of the gasification section are bonded by an adhesive (a commercially available product) to obtain a plasma gasification furnace (refer to Figure 1 ), in this embodiment, the size of the large brick is 500*400*200mm.

[0088] Example 2

[0089] The large bricks of the melting section include the following raw materials by weight: 75Kg of corundum, 2Kg of zirconium oxide, 4Kg of chromium oxide powder, 2Kg of aluminum oxide powder, 3Kg of binder and 0.05Kg of additives.

[0090] The large bricks in the molten pool section include the following raw materials by weight: 40 kg of fused chromium oxide, 15 kg of corundum, 4 kg of alumina powder, 2 kg of chromium oxide powder, 3 kg of binder and 0.05 kg of additives.

[0091] The large bricks of the molten pool section are prepared by the following method:

[0092] Mixing various raw materials to prepare a molding material;

[0093] The molding material is pressed under a pressure of 260 MPa to obtain a primary embryo;

[0094] The primary embryo was placed in an atmosphere with an oxygen content of 3%, fired at 1615°C for 7 hours, and then kept warm for 8 hours to obtain a large molten pool section brick.

[0095] The large bricks of the molten section are prepared by the following method:

[0096] Mixing various raw materials to prepare a molding material;

[0097] The molding material is pressed under a pressure of 260 MPa to obtain a primary embryo;

[0098] The primary embryo was placed in an atmosphere with an oxygen content of 3%, fired at 1640°C for 7 hours, and then kept warm for 8 hours to obtain a molten section brick.

[0099] The large bricks of the melting section, the large bricks of the melting pool section and the large bricks of the gasification section are bonded by an adhesive (a commercially available product) to obtain a plasma gasification furnace (refer to Figure 1 ), in this embodiment, the size of the large brick is 800*300*300mm.

[0100] Example 3

[0101] The large bricks of the melting section include the following raw materials by weight: 83Kg of corundum, 7Kg of zirconium oxide, 7Kg of chromium oxide powder, 5Kg of aluminum oxide powder, 7Kg of binder and 0.15Kg of additives.

[0102] The large bricks in the molten pool section include the following raw materials by weight: 70Kg of fused chromium oxide, 45Kg of corundum, 8Kg of alumina powder, 6Kg of chromium oxide powder, 7Kg of binder and 0.15Kg of additives.

[0103] The large bricks of the molten pool section are prepared by the following method:

[0104] Mixing various raw materials to prepare a molding material;

[0105] The molding material is pressed under a pressure of 280 MPa to obtain a primary embryo;

[0106] The primary embryo was placed in an atmosphere with an oxygen content of 3%, fired at 1625°C for 9 hours, and then kept warm for 10 hours to obtain a large molten pool section brick.

[0107] The large bricks of the molten section are prepared by the following method:

[0108] Mixing various raw materials to prepare a molding material;

[0109] The molding material is pressed under a pressure of 280 MPa to obtain a primary embryo;

[0110] The primary embryo was placed in an atmosphere with an oxygen content of 4%, fired at 1650°C for 9 hours, and then kept warm for 10 hours to obtain a molten section brick.

[0111] The large bricks of the melting section, the large bricks of the melting pool section and the large bricks of the gasification section are bonded by an adhesive (a commercially available product) to obtain a plasma gasification furnace (refer to Figure 1 ), in this embodiment, the size of the large brick is 1000*500*250mm.

[0112] Comparative Example 1

[0113] This embodiment is basically the same as the embodiment 1, except that the bricks used are ordinary corundum refractory bricks available on the market, with a size of 240 mm*115*200 mm.

[0114] Comparative Example 2

[0115] This embodiment is basically the same as the embodiment 1, except that the bricks used are ordinary corundum refractory bricks available on the market, and the size is the same as that of the embodiment 1.

[0116] The gasifiers of Comparative Examples 1 to 2 and Example 1 were tested under the same conditions, and the test conditions were as follows: molten material was put into the furnace and operated for 2 months, wherein the molten material was fly ash remaining after gasification and pyrolysis of radioactive waste, and the temperature of the melting section was 1400 to 1500°C.

[0117] After the test was completed, the thickness of the bricks in the gasifiers of Example 1 and Comparative Examples 1-2 was measured and photographed. The inner wall of the large brick of Example 1 is shown in FIG. Figure 3 As shown, the inner wall of the brick of comparative example 1 is as shown in Figure 4 As shown, the inner wall of the large brick of comparative example 2 is as shown Figure 5 shown.

[0118] After the test, Figure 3 It can be seen that the inner wall of the melting section obtained by the scheme of Example 1 is corroded, and the thickness of the large bricks in the melting section of Example 1 is 80mm; while the inner wall of Comparative Example 1 is obviously corroded, and the molten pool section is also corroded, and the brick thickness of the melting section is corroded by 120mm; the inner wall corrosion of Comparative Example 2 is more obvious than that of Comparative Example 1, and the brick thickness of the melting section is corroded by 138mm, and from Figure 5 It can be clearly seen that there are cracks at the bottom of the molten pool section, which may be caused by the erosion of the bottom of the molten pool section by the molten material. Therefore, the large brick size and the large brick obtained by the proportion of the present invention have excellent corrosion resistance and structural stability.

[0119] Compare again Figures 3 to 5 It can be seen that in the gasifier obtained by selecting the large bricks of Example 1, the erosion of the refractory material in the furnace is obviously more flat, smooth and uniform, and there are fewer honeycomb pits on the surface, which may be because the corrosion effect of radioactive waste on the inner wall is weakened; while the gasifier using ordinary corundum refractory bricks has more pits and more serious erosion on the inner wall after a period of use. The inner wall is obviously corroded by radioactive materials, which will lead to poor use of the gasifier and quick scrapping. By comparison, it can be seen that the large bricks obtained by the method of this embodiment can produce an excellent corrosion-resistant and reliable plasma gasifier.

[0120] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A plasma gasification furnace, characterized in that: include The molten pool section is used to contain the radioactive waste and melt the radioactive waste under external heating conditions; A molten section, fixedly connected to the molten pool section, and used for carrying molten radioactive waste solution; A gasification section, fixedly connected to the melting section, for accommodating the pyrolysis and gasification of the radioactive waste solution; The molten pool section and the melting section are both built with large bricks; The large bricks of the molten pool section include the following raw materials in parts by weight: 40-70 parts of fused chromium oxide, 15-45 parts of corundum, 4-8 parts of alumina powder, 2-6 parts of chromium oxide powder, 3-7 parts of binder and 0.05-0.15 parts of additives.

2. A plasma gasification furnace according to claim 1, characterized in that: The large bricks of the molten pool section include the following raw materials in parts by weight: 60-65 parts of fused chromium oxide, 18-30 parts of corundum, 5-7 parts of alumina powder, 3-5 parts of chromium oxide powder, 4-6 parts of binder and 0.08-0.13 parts of additives.

3. The plasma gasification furnace according to claim 1, characterized in that: The large bricks of the melting section include the following raw materials in parts by weight: 75-85 parts of corundum, 2-8 parts of zirconium oxide, 4-8 parts of chromium oxide powder, 2-6 parts of aluminum oxide powder, 3-7 parts of binder and 0.05-0.15 parts of additives.

4. A plasma gasification furnace according to claim 3, characterized in that: The large bricks of the melting section include the following raw materials in parts by weight: 78-83 parts of corundum, 3-7 parts of zirconium oxide, 5-7 parts of chromium oxide powder, 3-5 parts of aluminum oxide powder, 4-6 parts of binder and 0.08-0.13 parts of additives.

5. The plasma gasification furnace according to claim 1, characterized in that: The length of the large brick is 500-1000 mm, the width of the large brick is 300-500 mm, and the thickness of the large brick is 200-300 mm.

6. The plasma gasification furnace according to claim 1, characterized in that: The inner walls of the molten pool section, the melting section and the gasification section are all coated with a refractory layer.

7. The plasma gasification furnace according to claim 1, characterized in that: The large bricks of the molten pool section are prepared by the following method: Mixing various raw materials to prepare a molding material; Pressing the molding material into a shape to obtain a primary embryo; The primary embryo is fired and formed to obtain large bricks of the molten pool section.

8. The plasma gasification furnace according to claim 7, characterized in that: The firing process specifically includes placing the preform in an atmosphere with an oxygen content of 2-3%, firing at 1610-1625° C. for 6-9 hours, and then keeping the temperature for 5-10 hours.

9. The plasma gasification furnace according to claim 1, characterized in that: The large bricks of the melting section are prepared by the following method: Mixing various raw materials to prepare a molding material; Pressing the molding material into a shape to obtain a primary embryo; The primary embryo is fired and formed to obtain a large molten brick.

10. The plasma gasification furnace according to claim 9, characterized in that: The firing process specifically includes placing the embryo in an atmosphere with an oxygen content of 2-4%, firing at 1630-1650° C. for 6-9 hours, and then keeping the temperature for 5-10 hours.

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