CN115900348A - Furnace wall of a reaction furnace with a reaction temperature ≥ 1000°C and its construction method and application - Google Patents
Furnace wall of a reaction furnace with a reaction temperature ≥ 1000°C and its construction method and application Download PDFInfo
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Abstract
The invention relates to a furnace wall of a reaction furnace with the reaction temperature of more than or equal to 1000 ℃ and a construction method and application thereof, wherein the furnace wall comprises a first protective layer, a second protective layer, a third protective layer, a fourth protective layer and a fifth protective layer which are sequentially arranged; the thickness of the fourth protective layer is 0.03-0.08 times of the thickness of the furnace wall; the thickness of the fifth protective layer is 0.03-0.08 times of the thickness of the furnace wall; the fifth protective layer is the inner wall of the furnace. According to the furnace wall provided by the invention, the fourth protective layer and the fifth protective layer are adopted to jointly play a role in corrosion resistance on corrosive substances in a hearth, wherein the fourth protective layer constructed in a masonry mode mainly protects reaction gas in a high-temperature chlorination furnace, and the fifth protective layer plays a role in protecting chlorination products which have a corrosion effect and are used for the fourth protective layer. Therefore, each protective layer in the furnace wall structure of the high-temperature chlorination furnace realizes the purpose of smooth operation of the high-temperature chlorination furnace through synergistic action.
Description
Technical Field
The invention relates to the field of metallurgical reaction equipment, in particular to a furnace wall of a reaction furnace with the reaction temperature of more than or equal to 1000 ℃ and a construction method and application thereof.
Background
At present, the annual output of industrial solid wastes (solid wastes for short) is increased year by year, and the industrial solid wastes contain metal elements such as calcium, iron, aluminum, copper and the like or rare metal elements such as gold, silver and the like, so that the solid wastes are piled up, not only the land resources are seriously occupied, but also the greater hidden danger of environmental pollution exists. At present, the utilization of solid wastes is mostly concentrated on landfill or production of low-economic value-added products such as cement, floor tiles and the like, and the high-value utilization efficiency of valuable components is low, so that the serious waste of valuable elements is caused, and the sustainable development of the resource utilization of the solid wastes is not facilitated.
The extraction of valuable elements in the solid wastes is the most effective means for ensuring the high-value application of the valuable elements. At present, methods for extracting valuable components from solid wastes mainly comprise a wet process and a pyrogenic process, wherein a chlorination method in the pyrogenic process is concerned with people due to simple process, high treatment efficiency and remarkably reduced slag yield compared with other methods, but the chlorination method is limited by high reactivity and high corrosivity of chlorine, and the material resistance of the wall of a chlorine furnace is seriously challenged, so that the reaction temperature of the chlorination furnace is generally low (< 900 ℃) and the stable operation time is short.
At present, the design of the wall of the chlorination furnace aiming at the high-temperature chlorination furnace (more than or equal to 1000 ℃) is not reported, and some related reports on the design of the wall of the reaction furnace or the melting furnace are as follows:
CN103620332A discloses a furnace wall structure of a molten metal container and a method of constructing the furnace wall of the molten metal container, wherein the furnace wall is composed of four layers of a sheet iron, a permanent refractory lining the inner surface of the sheet iron, a heat insulating material lining the inner surface of the permanent refractory, and the magnesium-carbon refractory lining the inner surface of the heat insulating material. The molten metal vessel to which the furnace wall is applied is a converter.
CN112981097A discloses a water-cooled wall-free nickel-iron ore thermal furnace wall and slag-adhering method, the furnace wall structure of the iron smelting ore thermal furnace described in the patent sequentially comprises a high-temperature furnace wall protective layer, magnesium bricks, heat preservation magnesia, aluminum silicate fiber cotton, an embedded furnace wall temperature-measuring thermocouple and a steel shell from inside to outside, and a silicon-magnesium type high-temperature-resistant furnace wall protective layer formed by solidifying and adhering silicon-magnesium type furnace slag formed by smelting raw materials is also arranged on the furnace wall of the nickel-iron ore thermal furnace.
CN212645378U discloses a high temperature resistant oven wall structure, including outer oven and interior oven, outer oven with be provided with between the interior fireplace and be used for fixed a plurality of bracing pieces between them, interior oven is by outer insulating layer, heat preservation and the high temperature resistant layer of including in proper order to interior, be provided with the serpentine pole that is connected with the heating device on the high temperature furnace in the high temperature resistant layer, the utility model has the advantages of reduce fireplace thickness and high-efficient heat preservation.
CN110701633A discloses an explosion-proof furnace wall structure of an ignition burner of a coke oven gas boiler, which comprises a furnace wall body, wherein a pressure relief plate is arranged on the right side of the furnace wall body, a connecting column is fixedly connected to the left side of the pressure relief plate, the top of the pressure relief plate is positioned at a middle shaft, the bottom of the pressure relief plate is positioned at the bottom of the middle shaft, and the left side of the connecting column penetrates through the furnace wall body and extends to the left side of the furnace wall body. According to the invention, the high temperature resistant layer, the high temperature resistant silica gel layer and the organic silicon ceramic glass coating are arranged, so that the furnace wall body has very good high temperature resistance, the furnace wall body cannot be damaged when the temperature in the boiler is too high, the metal reinforcing plate is arranged, so that the furnace wall body has very good pressure resistance, and the pressure relief plate, the connecting column, the limiting plate, the reset spring and the pressure relief opening are matched, so that when the pressure in the boiler is too high, the pressure relief plate can be pushed to move outwards, and the boiler cannot explode.
CN211170604U discloses a molten pool induction heating auxiliary melting plasma gasification reaction furnace, wherein the furnace wall of a melting zone of the furnace sequentially comprises a graphite casting layer capable of conducting electricity, an insulating layer, an electromagnetic induction heating pipe, an insulating layer and a metal shell outer layer from inside to outside. The utility model discloses a through the oven structure of design melting zone, set up electromagnetic induction heating device in this region, make the material keep high temperature molten state in the molten bath always, guarantee that glass state liquid slag can discharge smoothly through row's cinder notch, ensure system's continuous operation, whole gasification equipment operating efficiency and stability improve.
The device and the method inhibit the corrosion of high-temperature media in the reaction furnace to the wall of the reaction furnace to a certain extent, stabilize the temperature in the reaction furnace and ensure the smooth operation of the reaction, but the material and the structure of the wall of the reaction furnace used in the scheme cannot provide an effective solution for the corrosion prevention process of high-corrosivity chlorine and related chlorinated products exceeding 1000 ℃.
Disclosure of Invention
In view of the problems in the prior art, the invention aims to provide a furnace wall of a reaction furnace with the reaction temperature of more than or equal to 1000 ℃ and a construction method and application thereof, and the furnace wall adopts a multi-layer furnace wall structure to respectively achieve the aims of supporting, heat preservation, heat insulation and corrosion prevention, so that the furnace wall has a good corrosion-resistant effect on high-temperature chlorine and other reaction gases and ensures the smooth operation of a high-temperature chlorination furnace.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a furnace wall of a reaction furnace with the reaction temperature of more than or equal to 1000 ℃, wherein the furnace wall comprises a first protective layer, a second protective layer, a third protective layer, a fourth protective layer and a fifth protective layer which are sequentially arranged;
the thickness of the fourth protective layer is 0.03-0.08 times of the thickness of the furnace wall;
the thickness of the fifth protective layer is 0.03-0.08 times of the thickness of the furnace wall;
the fifth protective layer is the inner wall of the furnace.
According to the furnace wall provided by the invention, the fourth protective layer and the fifth protective layer are jointly used for preventing corrosive substances in a hearth from being corroded, wherein the fourth protective layer constructed in a masonry mode mainly protects reaction gas in a high-temperature chlorination furnace, and the fifth protective layer protects chlorination products with corrosion effects of the fourth protective layer. Therefore, each protective layer in the furnace wall structure of the high-temperature chlorination furnace realizes the purpose of smooth operation of the high-temperature chlorination furnace through synergistic action.
The first protective layer has high strength, is the structure closest to the outer side of the high-temperature chlorination furnace in the furnace wall structure, and plays a role in supporting and preventing chlorine gas diffused through the pinholes in the furnace wall of the high-temperature chlorination furnace from escaping. The second protective layer has lower heat conductivity coefficient, so that the temperature in the hearth can be kept, meanwhile, the lower heat conductivity coefficient can ensure that the temperature of the inner side of the first protective layer is kept at a relatively lower level, and the corrosion speed of chlorine gas to the inner side of the first protective layer can be effectively reduced. The third protection layer has higher heat-resisting temperature and lower coefficient of heat conductivity, can play effective isolated effect to the heat in the oven, also has certain heat preservation effect simultaneously.
In the present invention, the thickness of the fourth protective layer is 0.03 to 0.08 times the thickness of the furnace wall, and may be, for example, 0.03 times, 0.035 times, 0.04 times, 0.045 times, 0.05 times, 0.055 times, 0.06 times, 0.065 times, 0.07 times, 0.075 times, or 0.08 times, but is not limited to the values listed, and other values not listed in this range are also applicable.
In the present invention, the thickness of the fifth protective layer is 0.03 to 0.08 times the thickness of the furnace wall, and may be, for example, 0.03 times, 0.035 times, 0.04 times, 0.045 times, 0.05 times, 0.055 times, 0.06 times, 0.065 times, 0.07 times, 0.075 times, or 0.08 times, but not limited to the above-mentioned values, and other values not listed in this range are also applicable.
In the invention, the thicknesses of the second protective layer and the third protective layer are confirmed according to the size of the used brick. Illustratively, the thickness of the second protective layer may be 0.32-0.44 times the thickness of the furnace wall, and the thickness of the third protective layer may be 0.32-0.44 times the thickness of the furnace wall.
In a preferred embodiment of the present invention, the thickness of the first protective layer is 0.06 to 0.2 times the thickness of the furnace wall, for example, 0.06 times, 0.07 times, 0.08 times, 0.09 times, 0.1 times, 0.11 times, 0.12 times, 0.13 times, 0.14 times, 0.15 times, 0.16 times, 0.17 times, 0.18 times, 0.19 times, or 0.2 times, but not limited to the above-mentioned values, and other values not listed in this range are also applicable.
Preferably, the material of the first protective layer comprises 1 or a combination of at least 2 of carbon steel, stainless steel or aluminum oxide. Typical, but non-limiting examples of such combinations include combinations of carbon steel and stainless steel, carbon steel and alumina, stainless steel and alumina.
In the present invention, the carbon steel may be other carbon steels commonly used in the art, such as Q345 or Q235.
In the present invention, the stainless steel may be 201L, 304L or 316L, among other stainless steels commonly used in the art.
As a preferred technical solution of the present invention, the material of the second protective layer comprises 1 or a combination of at least 2 of light clay bricks, light high alumina bricks or calcium silicate boards. Typical, but non-limiting examples of such combinations include combinations of light clay bricks and light high alumina bricks, light clay bricks and calcium silicate boards, light high alumina bricks and calcium silicate boards.
Preferably, the material of the third protective layer comprises 1 or at least 2 of corundum bricks, clay bricks, compact clay bricks or high-alumina bricks. Typical, but non-limiting examples of such combinations include corundum bricks and clay bricks, clay bricks and dense clay bricks, dense clay bricks and high-alumina bricks, corundum bricks and dense clay bricks, corundum bricks and high-alumina bricks, and combinations of clay bricks and high-alumina bricks.
As a preferable technical solution of the present invention, the material of the fourth protection layer includes 1 or a combination of at least 2 of carbon, silicon carbide, silicon nitride, silicon oxide, aluminum oxide, magnesium oxide, or mullite. Typical, but non-limiting, examples of such combinations include combinations of carbon and silicon carbide, silicon carbide and silicon nitride, carbon and silicon oxide, silicon oxide and alumina, silicon oxide and mullite, alumina and magnesia.
In the invention, the carbon used in the fourth protective layer can be carbon-containing bricks such as high carbon bricks, graphite bricks, semi-graphite bricks or carbon ramming mass.
As a preferred embodiment of the present invention, the material of the fifth protective layer includes 1 or a combination of at least 2 of kaolin, montmorillonite, graphite, water glass, calcium chloride, magnesium chloride, silicon oxide, or aluminum oxide. Typical, but non-limiting, examples of such combinations include combinations of kaolin and graphite, montmorillonite and water glass, montmorillonite and calcium chloride, water glass and silica, magnesium oxide and aluminum oxide.
In a second aspect, the invention provides a method of constructing a furnace wall according to the first aspect, the method comprising providing a second protective layer, a third protective layer, a fourth protective layer and a fifth protective layer in that order of design thickness, based on the first protective layer.
As a preferable technical scheme of the invention, the setting mode of the second protective layer comprises masonry;
preferably, the third protective layer is arranged in a masonry mode;
preferably, the fourth protective layer is arranged by single-layer masonry or multi-layer staggered joint masonry after the materials are made into bricks;
in the present invention, the melting point of the masonry brick material obtained by making the fourth protective layer is 1000 to 2000 ℃, for example, 1000 ℃, 1100 ℃, 1200 ℃, 1300 ℃, 1400 ℃, 1500 ℃, 1600 ℃, 1700 ℃, 1800 ℃, 1900 ℃, or 2000 ℃, but not limited to the values listed, and other values not listed in the range are also applicable. The resulting masonry block has a cold compression strength of 50 to 250MPa, for example 50MPa, 100MPa, 150MPa, 200MPa or 250MPa, but is not limited to the values recited, and other values not recited within this range are also applicable.
Preferably, the fifth protective layer is arranged in a manner of wet material spraying, blade coating or brick making and building.
In the present invention, when the fifth protection layer is provided in the form of a wet material, the liquid used may be any one of water, glycerin, and asphalt, or a combination of at least two of them, and typical but non-limiting examples thereof include water and glycerin, water and asphalt, and a combination of glycerin and asphalt.
In the present invention, the melting point of the block material obtained when the fifth protective layer is used for building bricks is 1200 to 2000 ℃, for example, 1200 ℃, 1300 ℃, 1400 ℃, 1500 ℃, 1600 ℃, 1700 ℃, 1800 ℃, 1900 ℃, or 2000 ℃, but is not limited to the values listed, and other values not listed in the range are also applicable. The resulting block material has a cold compressive strength of 30 to 80MPa, for example 30MPa, 40MPa, 50MPa, 60MPa, 70MPa or 80MPa, but is not limited to the values recited, and other values not recited within this range are also applicable.
As a preferred technical solution of the present invention, the fifth protection layer is baked;
preferably, the baking temperature is 800-1200 deg.C, such as 800 deg.C, 850 deg.C, 900 deg.C, 950 deg.C, 1000 deg.C, 1050 deg.C, 1100 deg.C, 1150 deg.C or 1200 deg.C, but is not limited to the recited values, and other values not recited in this range are equally applicable.
In the present invention, the baking time may be only to dry the fifth protective layer at a specific temperature (800 to 1200 ℃), and the specific time may be 10 to 48 hours, for example, 10 hours, 12 hours, 14 hours, 16 hours, 18 hours, 20 hours, 22 hours, 24 hours, 26 hours, 28 hours, 30 hours, 32 hours, 34 hours, 36 hours, 38 hours, 40 hours, 42 hours, 44 hours, 46 hours, or 48 hours, but is not limited to the listed values, and other values not listed in the range are also applicable.
As a preferred technical scheme of the invention, the construction method comprises the steps of sequentially arranging a second protective layer, a third protective layer, a fourth protective layer and a fifth protective layer according to the designed thickness by taking the first protective layer as a reference;
the second protective layer is arranged in a masonry mode; the third protective layer is arranged in a masonry mode; the fourth protective layer is arranged in a manner that the materials are bricked and then are subjected to single-layer masonry or multi-layer staggered joint masonry; the setting mode of the fifth protective layer comprises 1 of wet material spraying, blade coating or brick making and building; baking the fifth protective layer; the baking temperature is 800-1200 ℃.
In a third aspect, the invention provides use of a furnace wall according to the first aspect, the use comprising: and carrying out reaction by using a reaction furnace containing the furnace wall.
Preferably, the atmosphere used in the reaction comprises chlorine gas.
Preferably, the flow rate of the atmosphere used in the reaction is 0.02 to 1m/s, and may be, for example, 0.02m/s, 0.03m/s, 0.04m/s, 0.05m/s, 0.06m/s, 0.07m/s, 0.08m/s, 0.09m/s, 0.1m/s, 0.2m/s, 0.3m/s, 0.4m/s, 0.5m/s, 0.6m/s, 0.7m/s, 0.8m/s, 0.9m/s, or 1m/s, etc., but is not limited to the recited values, and other non-recited values in the range may be equally applicable.
In the present invention, the furnace wall can also be used in other high temperature reaction furnaces, such as reaction under an atmosphere consisting of 1 or at least 2 of carbon monoxide, carbon dioxide, air, nitrogen or oxygen, while the furnace wall provided by the present invention can be preferably applied to high temperature reaction under a chlorine atmosphere.
In the present invention, the high temperature reaction temperature is 1000-1600 ℃, for example, 1000 ℃, 1100 ℃, 1200 ℃, 1300 ℃, 1400 ℃, 1500 ℃ or 1600 ℃, but not limited to the values listed, and other values not listed in the range are also applicable.
Compared with the prior art, the invention has the following beneficial effects:
(1) The protective layers of the furnace wall structure of the high-temperature chlorination furnace effectively prevent chlorine and chlorination products from corroding the furnace wall at a high temperature through synergistic action, so that the chlorination furnace is ensured to run smoothly in a high-temperature chlorine environment.
(2) The furnace wall structure of the high-temperature chlorination furnace is adjusted by parameters such as the thickness of the protective layer, the material selection of the protective layer, the manufacturing process of the protective layer and the like, so that the method is suitable for reaction processes with different chlorination reaction temperatures, chlorination reaction atmospheres and gas flow rates.
Drawings
FIG. 1 is a schematic view showing the structure of the wall of a high-temperature chlorination furnace according to example 1 of the present invention;
FIG. 2 is a schematic view of a high-temperature chlorination reactor in example 1 of the present invention;
FIG. 3 is a graph of the corrosion rate of a first protective layer in a furnace wall provided by the present invention at different chlorination temperatures and gas flow rates.
In the figure: 1-a first protective layer, 2-a second protective layer, 3-a third protective layer, 4-a fourth protective layer, and 5-a fifth protective layer.
The present invention is described in further detail below. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the appended claims.
Detailed Description
To better illustrate the invention and to facilitate the understanding of the technical solutions thereof, typical but non-limiting examples of the invention are as follows:
example 1
The embodiment provides a furnace wall structure of a high-temperature chlorination furnace, a schematic diagram of which is shown in figure 1, and can be seen from the figure:
the furnace wall structure of the high-temperature chlorination furnace comprises a first protective layer 1, a second protective layer 2, a third protective layer 3, a fourth protective layer 4 and a fifth protective layer 5, and the furnace wall structure of the high-temperature chlorination furnace is formed by sequentially arranging the first protective layer, the second protective layer, the third protective layer, the fourth protective layer and the fifth protective layer from the outside of the furnace to the side of a hearth. The thickness of the furnace wall of the high-temperature chlorination furnace is 0 multiplied by d (mm) by the outer surface of the first protective layer 1, the inner surface position of the fifth protective layer 5 is 1 multiplied by d (mm), namely the thickness of the furnace wall is d (mm), wherein the thickness of the first protective layer 1 is 0.08 multiplied by d (mm), the thickness of the fourth protective layer 4 is 0.08 multiplied by d (mm), the thickness of the fifth protective layer 5 is 0.04 multiplied by d (mm), and the thicknesses of the third protective layer and the fourth protective layer are both 0.4 multiplied by d (mm).
The first protective layer 1 is made of a combination of carbon steel and alumina, the second protective layer 2 is made of light clay bricks, the third protective layer 3 is made of corundum bricks, and the fourth protective layer 4 is made of a combination of mullite and silicon carbide; the fifth protective layer 5 is composed of a combination of kaolin and calcium chloride. The melting point of the masonry brick material of the fourth protective layer 4 is 1200 ℃, and the cold compression strength of the brick is 100MPa. The melting point of the fifth protective layer 5 is 1500 ℃, and the cold state compressive strength is 50MPa. The construction process of the furnace wall structure of the high-temperature chlorination furnace comprises the following steps: the second protective layer 2 is built on the inner surface of the first protective layer 1, the third protective layer 3 is built on the inner surface of the second protective layer 2, the fourth protective layer 4 is built on the inner surface of the third protective layer 3, and the fifth protective layer 5 is lined on the inner surface of the fourth protective layer 4. The fourth protective layer 4 can be constructed by adopting a single layer, and the fifth protective layer 5 is formed in one step. The fifth protective layer 5 can be formed by coating wet materials on the inner wall of the fourth protective layer 4 and then drying. The liquid material for preparing the wet material for constructing the fifth protective layer 5 can be water.
Example 2
The present embodiment provides a furnace wall structure of a high-temperature chlorination furnace, which is different from embodiment 1 only in that in the furnace wall structure of the high-temperature chlorination furnace, the thickness of the first protection layer 1 is 0.1 xd (mm), the thickness of the fourth protection layer 4 is 0.08 xd (mm), the thickness of the fifth protection layer 5 is 0.04 xd (mm), and the thicknesses of the third protection layer and the fourth protection layer are both 0.39 xd (mm).
The first protective layer 1 is made of stainless steel, the second protective layer 2 is made of a combination of light clay bricks and calcium silicate boards, the third protective layer 3 is made of dense clay bricks, and the fourth protective layer 4 is made of a combination of aluminum oxide and silicon nitride; the fifth protective layer 5 is formed by the combination of water glass and silicon oxide. The melting point of the masonry brick material of the fourth protective layer 4 is 1000 ℃, and the cold compressive strength of the brick is 135MPa. The melting point of the fifth protective layer 5 is 1200 ℃, and the cold state compressive strength is 45MPa.
Example 3
This example provides a furnace wall structure of a high temperature chlorination furnace, which is different from example 1 only in that in the furnace wall structure of the high temperature chlorination furnace, the thickness of the first protective layer 1 is 0.2 × d (mm), the thickness of the fourth protective layer 4 is 0.06 × d (mm), the thickness of the fifth protective layer 5 is 0.06 × d (mm), the thickness of the third protective layer is 0.36 × d (mm), and the thickness of the fourth protective layer is 0.32 × d (mm).
The first protective layer 1 is made of carbon steel, the second protective layer 2 is made of light high-alumina bricks and calcium silicate boards, the third protective layer 3 is made of dense clay bricks and high-alumina bricks, and the fourth protective layer 4 is made of silicon oxide and carbon; the fifth protective layer 5 is made of a combination of mullite and silicon carbide. The melting point of the masonry brick material of the fourth protective layer 4 is 1600 ℃, and the cold compressive strength of the brick is 120MPa. The melting point of the fifth protective layer 5 is 1500 ℃, and the cold state compressive strength is 60MPa.
The fourth protective layer 4 is built in a multi-layer staggered joint mode.
The fifth protective layer is formed by 5 times.
Application example 1
This application example provides the use of the furnace wall described in example 1 as a high temperature reaction furnace wall as shown in FIG. 2 for carrying out a high temperature reaction;
the reaction atmosphere in the high-temperature reaction is the combination of chlorine and carbon monoxide, the chlorination reaction temperature is 1500 ℃, and the flow of the reaction gas in the high-temperature chlorination furnace is 0.08m/s.
Application example 2
This application example provides the use of the furnace wall described in example 2 as a high temperature reaction furnace wall for carrying out a high temperature reaction;
the reaction atmosphere in the high-temperature reaction is chlorine, the chlorination reaction temperature is 1200 ℃, and the flow rate of the reaction gas of the high-temperature chlorination furnace is 0.1m/s.
Application example 3
This application example provides the use of the furnace wall described in example 3 as a high temperature reaction furnace wall for carrying out a high temperature reaction;
the reaction atmosphere in the high-temperature reaction is the combination of chlorine and air, the chlorination reaction temperature is 1300 ℃, and the flow rate of the reaction gas in the high-temperature chlorination furnace is 0.05m/s.
Application example 4
The difference from the application example 1 is only that in the furnace wall structure of the high-temperature chlorination furnace, the thickness of the first protective layer is 0.02 x d (mm).
Application example 5
The only difference from application example 1 is that in the furnace wall structure of the high-temperature chlorination furnace, the thickness of the first protective layer is 0.25 x d (mm).
Application example 6
The difference from the application example 1 is only that in the furnace wall structure of the high-temperature chlorination furnace, the thickness of the fifth protective layer is 0.02 x d (mm).
Application example 7
The difference from application example 1 is only that in the furnace wall structure of the high-temperature chlorination furnace used, the thickness of the fifth protective layer is 0.1 xd (mm).
Application example 8
The difference from the application example 1 is only the furnace wall structure of the high-temperature chlorination furnace, the melting point of the masonry brick material of the fourth protective layer is 800 ℃, and the cold compressive strength of the brick is 35MPa.
Application example 9
The difference from the application example 1 is only the furnace wall structure of the high-temperature chlorination furnace, the melting point of the masonry brick material of the fifth protective layer is 800 ℃, and the cold-state compressive strength of the brick is 25MPa.
Application example 10
The only difference from application example 1 is that the chlorination reaction temperature is 1800 ℃.
Application example 11
The only difference from application example 1 was that the reaction gas flow rate was 3m/s.
Comparative application example 1
The only difference from application example 1 is that the fourth protective layer and the fifth protective layer are not provided.
The thickness d of the furnace wall used in the above application example was 1050mm.
The values reported in table 1 are for examples 1-3, respectively, for different high temperature chlorination process parameters.
TABLE 1
Table 2 shows the corrosion prevention effect of the chlorination reactor wall parameter design according to the values in table 1 in application examples 1-3 on high-temperature chlorine gas and related chlorinated products, and the corrosion prevention effect of the high-temperature chlorination process according to the reaction atmosphere, oxidation temperature and gas flow rate corresponding to application example 1 in table 1 in application examples 4-11 and comparative application example 1 is detailed in table 2.
TABLE 2
| Item | Chlorine escaping from the outside of the furnace | Item | Chlorine escaping from the outside of the furnace |
| Application example 1 | Whether or not | Application example 7 | Is that |
| Application example 2 | Whether or not | Application example 8 | Is that |
| Application example 3 | Whether or not | Application example 9 | Is that |
| Application example 4 | Is that | Application example 10 | Is that |
| Application example 5 | Whether or not | Application example 11 | Is that |
| Application example 6 | Is that | Comparative application example 1 | Is that |
As can be seen from Table 2, the walls of the reactor according to the invention are effective in preventing corrosion of high temperature chlorine and related chlorinated products. The results of comparing the application example 1 with the application example 1 show that the fourth protection layer and the fifth protection layer have obvious corrosion resistance to high-temperature chlorine; comparing the results of application example 1, application example 4 and application example 5, it can be seen that if the thickness of the first protective layer is too small, the chlorine gas in the high-temperature chlorination process permeating from the hearth cannot be effectively resisted from corroding, so that the first protective layer is corroded and penetrated by the chlorine gas, and the chlorine gas escapes, while if the thickness of the first protective layer is too large, the chlorine gas corrosion penetration can be effectively prevented, but the manufacturing cost of the chlorine gas reaction furnace is increased, and the specific corrosion condition of the first protective layer is shown in fig. 3 in detail; as is clear from the results of application examples 1, 6, and 7, the fifth protective layer has too small a thickness, which results in too large a permeation amount of high-temperature chlorine gas, thereby reducing the overall chlorine gas corrosion prevention effect of the furnace wall structure of the high-temperature chlorination reaction furnace, while too large a thickness results in too large an internal stress of the protective layer, which makes it easy to generate microcracks during the dry forming process. The generation of microcracks can also lead to the reduction of the overall chlorine anti-corrosion effect of the furnace wall structure; comparing the results of application example 1, application example 8 and application example 9, it can be seen that when the fourth protective layer and the fifth protective layer are made of materials with low melting points or low cold compressive strength, the overall corrosion prevention effect of the furnace wall structure is reduced because the effective thermal strength cannot be ensured in the reaction process of the high-temperature chlorine gas; as is clear from the results of application example 1, application example 10, and application example 11, it is theoretically inferred that too low chlorination reaction temperature and gas flow rate lead to a low chlorination rate of the reactant, so that the productivity of the chlorination process is low, which is not favorable for industrial production, but too high chlorination reaction temperature and gas flow rate lead to an increase in the corrosion rate of the furnace wall structure, thereby destroying the furnace wall structure, and leading to a decrease in the corrosion prevention effect of the furnace wall structure.
It is to be noted that the present invention is described by the detailed structural features of the present invention through the above embodiments, but the present invention is not limited to the detailed structural features, that is, it is not meant to imply that the present invention must be implemented by relying on the detailed structural features. It should be understood by those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, additions of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
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