Furnace baking method based on electric heating

Abstract

The invention discloses an oven drying method based on electric heating. The oven drying method is specifically implemented according to the following steps that 1, an oven drying theoretical heating curve is selected; 2, calculating the number and the power of the electric heating sheets used in the furnace baking process; step 3, installing an electric heating sheet on the equipment; 4, a thermocouple is installed on the refractory layer; 5, the electric heating piece and the thermocouple are connected with a power source, and furnace baking operation is completed according to the heating curve determined in the step 1; and step 6, recovering the electric heating sheet and the thermocouple after furnace baking is finished. The electric heating pieces are evenly laid on the surface of the refractory layer for baking, free water, bound water and even crystal water of refractory layer castable can be effectively removed, electric energy is transmitted to the heating pieces through the touch temperature control cabinet, heating, heat preservation and cooling of the refractory layer are completed according to an oven baking curve, related oven baking data are recorded, and the baking efficiency of the refractory layer is improved. Cracking and peeling of the brittle refractory material caused by rapid heating and cooling speed are avoided to the maximum extent.

Description

Technical Field

[0001] The invention belongs to the technical field of petrochemical equipment furnace drying methods, and in particular relates to a furnace drying method based on electric heating. Background Art

[0002] With the advancement of science and technology, the working environment of more and more petrochemical equipment has become very harsh. Some equipment operates in a high temperature environment, and the working temperature will be above 1000℃. General metal equipment cannot operate safely at this temperature. Therefore, it is necessary to cast refractory materials inside the metal shell. The refractory materials are mainly cast materials with corundum as the main material. The construction process of the refractory layer mainly includes molding, pouring, and furnace baking. The traditional furnace baking process adopts the method of direct flame heating in the furnace. Its main fuels are wood, natural gas, diesel, etc. This process has the following main disadvantages: large heat loss during combustion. After the fuel burns to generate heat, the heat is transferred to the inside of the furnace by heat conduction, thermal radiation, etc. However, during the transfer process, due to factors such as flue gas emissions and heat dissipation of the furnace body, a large amount of heat is wasted, resulting in low thermal efficiency, which not only increases energy costs, but also has certain negative impacts on the environment; due to the limitations of heating methods and control systems, it is difficult to achieve high-precision temperature control in traditional furnaces; traditional furnaces will produce heat during the combustion process. A large amount of pollutants are generated, including sulfur dioxide, nitrogen oxides, particulate matter, etc. The emission of these pollutants not only pollutes the surrounding environment and harms human health, but also requires enterprises to invest a lot of money in pollution control to meet the requirements of environmental protection laws and regulations; and personnel are required to be stationed on site to pay real-time attention to the heating situation in the furnace and add fuel according to the experience of the furnace construction personnel, which consumes a lot of manpower and working hours, and cannot accurately monitor the heating temperature and insulation time, and cannot generate relevant data records. The heating and cooling speed is large, and the heating degree at different positions is uneven. During the furnace baking process, the refractory layer is prone to form wider cracks, and even local peeling occurs. Summary of the invention

[0003] The purpose of the present invention is to provide a furnace baking method based on electric heating, which solves the problem of refractory layer falling off in the existing furnace baking process.

[0004] The technical solution adopted by the present invention is a baking method based on electric heating, which is specifically implemented according to the following steps:

[0005] Step 1, select the theoretical heating curve of the oven;

[0006] Step 2, calculate the number and power of the electric heating plates used in the oven process;

[0007] Step 3: Install the electric heating plate on the equipment;

[0008] Step 4: Install a thermocouple on the refractory layer;

[0009] Step 5, connect the electric heating plate and the thermocouple to the power supply, and complete the oven operation according to the heating curve determined in step 1;

[0010] Step 6: After the oven is finished, the electric heating plate and the thermocouple are recovered.

[0011] The present invention is also characterized in that:

[0012] The theoretical heating curve in step 1 corresponds to the initial forming condition of the refractory layer, the dehumidification condition of the refractory layer when the equipment is idle for a long time, and the maintenance condition of the refractory layer when the equipment is overhauled for a short time, according to different baking purposes of the inner fire layer.

[0013] The maximum heating temperature for the initial forming of the refractory layer is 800°C, which is used for the initial forming of the refractory layer and to remove free water, bound water and crystallized water from the refractory layer; the maximum heating temperature for the dehumidification of the refractory layer when the equipment is idle for a long time is 600°C, which is used for equipment placed for more than three months to remove free water adsorbed in humid air on the surface of the corrosion-resistant layer and bound water inside the refractory layer; the maximum heating temperature for the maintenance of the refractory layer during short-term equipment maintenance is 360°C, which is used for short-term equipment shutdown for maintenance, not exceeding 10 days, to remove free water on the surface of the refractory layer.

[0014] In step 2, the required number of electric heating plates is calculated according to the specific structure of the equipment, wherein the total area of ​​the electric heating plates is 70% to 80% of the actual surface area of ​​the heat-resistant layer.

[0015] In step 3, the electric heating plates are installed starting from the bottom of the equipment and evenly installed on the outer surface of the refractory layer at intervals of 50 mm to 100 mm.

[0016] When installing the electric heating plate, use steel pipes and iron wire supports to support and fix the electric heating plate, and cover the surface of the electric heating plate with thermal insulation cotton.

[0017] In step 4, a socket is opened on the surface of the refractory layer, a thermocouple is placed in the socket, and the end of the socket is sealed with refractory cotton.

[0018] The diameter of the plug hole is 5mm-8mm, the hole depth is 20mm from the inner surface of the heat-resistant layer, and the spacing between the plug holes is 1000mm.

[0019] In step 5, during the baking process, the temperature measuring point data of the heating curve is compared to adjust the real-time heating and cooling speed of the baking curve. According to the specific heating temperature, a suitable cable is selected, wherein the pure copper cable can withstand a temperature of 500°C, the nickel-plated cable can withstand a temperature of 600°C, and the pure nickel cable can withstand a temperature of 1000°C.

[0020] In step 6, after the oven completes the recovery of the thermocouple, the jack is filled with high temperature resistant fireproof cotton, and then the cover is sealed with a high temperature resistant adhesive, and then the surface of the refractory layer is polished and cleaned, and finally a heat source is set in the furnace to insulate and maintain the refractory layer.

[0021] The beneficial effects of the present invention are:

[0022] The present invention is based on an electric heating furnace baking method. By evenly laying electric heating plates on the surface of the refractory layer for baking, free water, combined water and even crystallized water of the refractory castable can be effectively removed. Electric energy is transmitted to the heating plates by using a touch-controlled temperature control cabinet. According to a certain furnace baking curve, the refractory layer is heated, kept warm and cooled, and relevant furnace baking data is recorded, thereby avoiding cracking and peeling of brittle refractory materials caused by thermal expansion and contraction due to rapid heating and cooling rates to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the heating control components of the electric heating-based oven drying method of the present invention;

[0024] Figure 2 is a schematic diagram of a baking furnace curve a in the baking furnace method based on electric heating of the present invention;

[0025] Figure 3 is a schematic diagram of a baking furnace curve b in the baking furnace method based on electric heating of the present invention;

[0026] Figure 4 It is a schematic diagram of a baking curve c in the baking method based on electric heating of the present invention;

[0027] Figure 5 It is a schematic diagram of installing the electric heating plate in the electric heating oven method of the present invention;

[0028] Figure 6 It is a schematic diagram of the axial distribution of the jacks in the electric heating-based oven method of the present invention;

[0029] Figure 7 It is a schematic diagram of the annular distribution of the jacks in the electric heating-based baking method of the present invention. DETAILED DESCRIPTION

[0030] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] The present invention provides a method for baking a furnace based on electric heating, which is specifically implemented according to the following steps:

[0032] Step 1, select the theoretical heating curve of the oven;

[0033] Step 2, calculate the number and power of the electric heating plates used in the oven process;

[0034] Step 3: Install the electric heating plate on the equipment;

[0035] Step 4: Install a thermocouple on the refractory layer;

[0036] Step 5, connect the electric heating plate and the thermocouple to the power supply, and control them through the temperature control cabinet to complete the oven operation according to the heating curve determined in step 1;

[0037] Step 6: After the oven is finished, the electric heating plate and the thermocouple are recovered.

[0038] The present invention is based on an electric heating oven method. The main heating control components include an industrial power supply (a diesel generator set with matching power can also be used), a touch-controlled intelligent temperature control cabinet, connecting wires and a crawler-type electric heating sheet, such as Figure 1 shown.

[0039] Example 1

[0040] The present invention is based on an electrically heated furnace baking method, wherein the theoretical heating curve in step 1 corresponds to the initial forming condition of the refractory layer, the dehumidification condition of the refractory layer when the equipment is idle for a long time, and the maintenance condition of the refractory layer when the equipment is overhauled for a short time according to different baking purposes for the inner fire layer.

[0041] like Figure 2 The maximum heating temperature of the initial forming condition of the refractory layer corresponding to the furnace curve a shown is 800°C, which is used for the initial forming of the refractory layer to remove free water, bound water and crystal water of the refractory layer; Figure 3 The maximum heating temperature of the dehumidification condition of the refractory layer when the equipment is idle for a long time corresponding to the drying furnace curve b shown is 600℃, which is used for the equipment to be placed for more than three months to remove the free water in the adsorbed humid air on the surface of the corrosion-resistant layer and the bound water inside the refractory layer; Figure 4 The furnace curve c shown corresponds to a maximum heating temperature of 360°C for the refractory maintenance condition during short-term equipment maintenance. It is used for short-term equipment shutdown maintenance, not exceeding 10 days, to remove free water on the surface of the refractory layer.

[0042] Example 2

[0043] The present invention is based on an electrically heated furnace baking method, wherein the theoretical heating curve in step 1 corresponds to the initial forming condition of the refractory layer, the dehumidification condition of the refractory layer when the equipment is idle for a long time, and the maintenance condition of the refractory layer when the equipment is overhauled for a short time according to different baking purposes for the inner fire layer.

[0044] The maximum heating temperature for the initial forming condition of the refractory layer corresponding to the baking furnace curve a is 800°C, which is used for the initial forming of the refractory layer to remove free water, bound water and crystallized water from the refractory layer; the maximum heating temperature for the dehumidification condition of the refractory layer when the equipment is idle for a long time corresponding to the baking furnace curve b is 600°C, which is used for equipment placed for more than three months to remove free water adsorbed in humid air on the surface of the corrosion-resistant layer and bound water inside the refractory layer; the maximum heating temperature for the refractory maintenance condition of the refractory layer during short-term maintenance of the equipment corresponding to the baking furnace curve c is 360°C, which is used for short-term shutdown of the equipment for maintenance, not exceeding 10 days, to remove free water on the surface of the refractory layer.

[0045] In step 2, the required number of electric heating plates is calculated according to the specific structure of the equipment, wherein the total area of ​​the electric heating plates is 70% to 80% of the actual surface area of ​​the heat-resistant layer, so that the heating and heat preservation process can be completed more efficiently.

[0046] For example: The wall area of ​​a cylindrical container is: S = πDH.

[0047] D is the inner diameter of the container, H is the height of the container, S is the inner surface area of ​​the cylinder wall, S 加热片 is the area of ​​a single heater.

[0048] Number of heating plates: N = (0.7-0.8) * S / S 加热片 .

[0049] Based on the initial forming condition of the refractory layer, the heating temperature is the highest and the insulation time is the longest under this condition. Combined with the on-site construction experience, it is finally calculated that the heating power required for the unit refractory layer furnace area shall not be less than 29kw / m 2 .

[0050] Example 3

[0051] The present invention is based on an electrically heated furnace baking method, wherein the theoretical heating curve in step 1 corresponds to the initial forming condition of the refractory layer, the dehumidification condition of the refractory layer when the equipment is idle for a long time, and the maintenance condition of the refractory layer when the equipment is overhauled for a short time according to different baking purposes for the inner fire layer.

[0052] The maximum heating temperature for the initial forming condition of the refractory layer corresponding to the baking furnace curve a is 800°C, which is used for the initial forming of the refractory layer to remove free water, bound water and crystallized water from the refractory layer; the maximum heating temperature for the dehumidification condition of the refractory layer when the equipment is idle for a long time corresponding to the baking furnace curve b is 600°C, which is used for equipment placed for more than three months to remove free water adsorbed in humid air on the surface of the corrosion-resistant layer and bound water inside the refractory layer; the maximum heating temperature for the refractory maintenance condition of the refractory layer during short-term maintenance of the equipment corresponding to the baking furnace curve c is 360°C, which is used for short-term shutdown of the equipment for maintenance, not exceeding 10 days, to remove free water on the surface of the refractory layer.

[0053] In step 2, the required number of electric heating plates is calculated according to the specific structure of the equipment, wherein the total area of ​​the electric heating plates is 70% to 80% of the actual surface area of ​​the heat-resistant layer, so that the heating and heat preservation process can be completed more efficiently.

[0054] In step 3, install the electric heater from the bottom of the device. Figure 5 As shown, they are evenly installed on the outer surface of the refractory layer at intervals of 50 mm to 100 mm.

[0055] When installing the electric heating plate, use steel pipes and wire supports to support the tooling to fix the electric heating plate. The shape of the tooling can be set to a "M" shape, a "Well" shape, etc. according to the actual conditions on site, and cover the surface of the electric heating plate with thermal insulation cotton to prevent heat loss during the baking process.

[0056] Example 4

[0057] The present invention is based on an electrically heated furnace baking method, wherein the theoretical heating curve in step 1 corresponds to the initial forming condition of the refractory layer, the dehumidification condition of the refractory layer when the equipment is idle for a long time, and the maintenance condition of the refractory layer when the equipment is overhauled for a short time according to different baking purposes for the inner fire layer.

[0058] The maximum heating temperature for the initial forming condition of the refractory layer corresponding to the baking furnace curve a is 800°C, which is used for the initial forming of the refractory layer to remove free water, bound water and crystallized water from the refractory layer; the maximum heating temperature for the dehumidification condition of the refractory layer when the equipment is idle for a long time corresponding to the baking furnace curve b is 600°C, which is used for equipment placed for more than three months to remove free water adsorbed in humid air on the surface of the corrosion-resistant layer and bound water inside the refractory layer; the maximum heating temperature for the refractory maintenance condition of the refractory layer during short-term maintenance of the equipment corresponding to the baking furnace curve c is 360°C, which is used for short-term shutdown of the equipment for maintenance, not exceeding 10 days, to remove free water on the surface of the refractory layer.

[0059] In step 2, the required number of electric heating plates is calculated according to the specific structure of the equipment, wherein the total area of ​​the electric heating plates is 70% to 80% of the actual surface area of ​​the heat-resistant layer, so that the heating and heat preservation process can be completed more efficiently.

[0060] In step 3, the electric heating plates are installed starting from the bottom of the equipment and evenly installed on the outer surface of the refractory layer at intervals of 50 mm to 100 mm.

[0061] When installing the electric heating plate, use steel pipes and wire supports to support the tooling to fix the electric heating plate. The shape of the tooling can be set to a "M" shape, a "Well" shape, etc. according to the actual conditions on site, and cover the surface of the electric heating plate with thermal insulation cotton to prevent heat loss during the baking process.

[0062] In step 4, a socket is opened on the surface of the refractory layer, a thermocouple is placed in the socket, and the end of the socket is sealed with refractory cotton.

[0063] To ensure the accuracy of temperature detection during the oven drying process, the diameter of the plug hole is set to 5mm-8mm, the hole depth is opened to 20mm from the inner surface of the heat-resistant layer, and the spacing between the plug holes is 1000mm, as follows Figure 6-7 The annular distribution and number of the jacks are set according to the data in Table 1.

[0064] Table 1 Circumferential distribution number of jacks

[0065] Refractory layer diameter / mm ≤1000 1000～3000 3000～5000 Number of sockets 2 4 8

[0066] Example 5

[0067] The present invention is based on an electrically heated furnace baking method, wherein the theoretical heating curve in step 1 corresponds to the initial forming condition of the refractory layer, the dehumidification condition of the refractory layer when the equipment is idle for a long time, and the maintenance condition of the refractory layer when the equipment is overhauled for a short time according to different baking purposes for the inner fire layer.

[0068] The maximum heating temperature for the initial forming condition of the refractory layer corresponding to the baking furnace curve a is 800°C, which is used for the initial forming of the refractory layer to remove free water, bound water and crystallized water from the refractory layer; the maximum heating temperature for the dehumidification condition of the refractory layer when the equipment is idle for a long time corresponding to the baking furnace curve b is 600°C, which is used for equipment placed for more than three months to remove free water adsorbed in humid air on the surface of the corrosion-resistant layer and bound water inside the refractory layer; the maximum heating temperature for the refractory maintenance condition of the refractory layer during short-term maintenance of the equipment corresponding to the baking furnace curve c is 360°C, which is used for short-term shutdown of the equipment for maintenance, not exceeding 10 days, to remove free water on the surface of the refractory layer.

[0069] In step 2, the required number of electric heating plates is calculated according to the specific structure of the equipment, wherein the total area of ​​the electric heating plates is 70% to 80% of the actual surface area of ​​the heat-resistant layer, so that the heating and heat preservation process can be completed more efficiently.

[0070] In step 3, the electric heating plates are installed starting from the bottom of the equipment and evenly installed on the outer surface of the refractory layer at intervals of 50 mm to 100 mm.

[0071] When installing the electric heating plate, use steel pipes and wire supports to support the tooling to fix the electric heating plate. The shape of the tooling can be set to a "M" shape, a "Well" shape, etc. according to the actual conditions on site, and cover the surface of the electric heating plate with thermal insulation cotton to prevent heat loss during the baking process.

[0072] In step 4, a socket is opened on the surface of the refractory layer, a thermocouple is placed in the socket, and the end of the socket is sealed with refractory cotton.

[0073] In order to ensure the accuracy of temperature detection during the baking process, the diameter of the hole is set to 5mm-8mm, the hole depth is opened to 20mm from the inner surface of the heat-resistant layer, and the spacing between the holes is 1000mm.

[0074] In step 5, during the baking process, the temperature measuring point data of the heating curve is compared to adjust the real-time heating and cooling speed of the baking curve. According to the specific heating temperature, a suitable cable is selected, wherein the pure copper cable can withstand a temperature of 500°C, the nickel-plated cable can withstand a temperature of 600°C, and the pure nickel cable can withstand a temperature of 1000°C.

[0075] Example 6

[0076] The present invention is based on an electrically heated furnace baking method, wherein the theoretical heating curve in step 1 corresponds to the initial forming condition of the refractory layer, the dehumidification condition of the refractory layer when the equipment is idle for a long time, and the maintenance condition of the refractory layer when the equipment is overhauled for a short time according to different baking purposes for the inner fire layer.

[0077] The maximum heating temperature for the initial forming condition of the refractory layer corresponding to the baking furnace curve a is 800°C, which is used for the initial forming of the refractory layer to remove free water, bound water and crystallized water from the refractory layer; the maximum heating temperature for the dehumidification condition of the refractory layer when the equipment is idle for a long time corresponding to the baking furnace curve b is 600°C, which is used for equipment placed for more than three months to remove free water adsorbed in humid air on the surface of the corrosion-resistant layer and bound water inside the refractory layer; the maximum heating temperature for the refractory maintenance condition of the refractory layer during short-term maintenance of the equipment corresponding to the baking furnace curve c is 360°C, which is used for short-term shutdown of the equipment for maintenance, not exceeding 10 days, to remove free water on the surface of the refractory layer.

[0078] In step 2, the required number of electric heating plates is calculated according to the specific structure of the equipment, wherein the total area of ​​the electric heating plates is 70% to 80% of the actual surface area of ​​the heat-resistant layer, so that the heating and heat preservation process can be completed more efficiently.

[0079] In step 3, the electric heating plates are installed starting from the bottom of the equipment and evenly installed on the outer surface of the refractory layer at intervals of 50 mm to 100 mm.

[0080] When installing the electric heating plate, use steel pipes and wire supports to support the tooling to fix the electric heating plate. The shape of the tooling can be set to a "M" shape, a "Well" shape, etc. according to the actual conditions on site, and cover the surface of the electric heating plate with thermal insulation cotton to prevent heat loss during the baking process.

[0081] In step 4, a socket is opened on the surface of the refractory layer, a thermocouple is placed in the socket, and the end of the socket is sealed with refractory cotton.

[0082] In order to ensure the accuracy of temperature detection during the baking process, the diameter of the hole is set to 5mm-8mm, the hole depth is opened to 20mm from the inner surface of the heat-resistant layer, and the spacing between the holes is 1000mm.

[0083] In step 5, during the baking process, the temperature measuring point data of the heating curve is compared to adjust the real-time heating and cooling speed of the baking curve. According to the specific heating temperature, a suitable cable is selected, wherein the pure copper cable can withstand a temperature of 500°C, the nickel-plated cable can withstand a temperature of 600°C, and the pure nickel cable can withstand a temperature of 1000°C.

[0084] In step 6, after the oven completes the recovery of the thermocouple, the jack is filled with high temperature resistant fireproof cotton, and then the cover is sealed with a high temperature resistant adhesive, and the surface of the refractory layer is polished and cleaned, and finally a heat source (such as an incandescent lamp, an electric furnace, etc.) is set in the furnace to insulate and maintain the refractory layer for a short period of time (usually no more than 1 day).

[0085] The present invention is based on the electric heating furnace baking method. The operator does not need to stay at the construction site all the time, but only needs to monitor the data of the temperature control cabinet. The heating, insulation and cooling of the whole process of the furnace baking can be accurately controlled, and the whole process can be recorded. The speed of heating and cooling in the whole process can be effectively controlled, which can avoid the cracking and peeling of the brittle refractory material caused by its own thermal expansion and contraction due to the rapid heating and cooling speed to the greatest extent. The present invention is not only suitable for the initial solidification and molding of the refractory layer, but also can heat and dehumidify the formed refractory layer of the equipment placed for a long time according to different requirements, and can also be baked for a short time during the equipment shutdown and maintenance to meet the requirement of waterless operation of the equipment. The whole furnace baking process is environmentally friendly and will not cause environmental pollution.

Claims

1. A method of baking oven based on electric heating, characterized in that: Follow the steps below to implement it: Step 1, select the theoretical heating curve of the oven; Step 2, calculating the number and power of the electric heating plates used in the oven process; Step 3: Install the electric heating plate on the equipment; Step 4: Install a thermocouple on the refractory layer; Step 5, connect the electric heating plate and the thermocouple to the power supply, and complete the oven operation according to the heating curve determined in step 1; Step 6: After the oven is finished, the electric heating plate and the thermocouple are recovered.

2. The electric heating oven method according to claim 1, characterized in that: The theoretical heating curve in step 1 corresponds to the initial forming condition of the refractory layer, the dehumidification condition of the refractory layer when the equipment is idle for a long time, and the maintenance condition of the refractory layer when the equipment is overhauled for a short time according to different baking purposes of the inner fire layer.

3. The electric heating-based oven method according to claim 2, characterized in that: The maximum heating temperature for the initial forming condition of the refractory layer is 800°C, which is used for the initial forming of the refractory layer to remove free water, bound water and crystallized water from the refractory layer; the maximum heating temperature for the dehumidification condition of the refractory layer when the equipment is idle for a long time is 600°C, which is used when the equipment is placed for more than three months to remove free water adsorbed in humid air on the surface of the corrosion-resistant layer and bound water inside the refractory layer; the maximum heating temperature for the refractory layer maintenance condition when the equipment is overhauled for a short time is 360°C, which is used when the equipment is stopped for overhaul for a short time, not exceeding 10 days, to remove free water on the surface of the refractory layer.

4. The electric heating oven method according to claim 1, characterized in that: In step 2, the required number of electric heating plates is calculated according to the specific structure of the equipment, wherein the total area of ​​the electric heating plates is 70% to 80% of the actual surface area of ​​the heat-resistant layer.

5. The electric heating-based oven drying method according to claim 1, characterized in that: In step 3, the electric heating plates are installed starting from the bottom of the equipment and evenly on the outer surface of the fireproof layer at intervals of 50 mm to 100 mm.

6. The electric heating-based oven drying method according to claim 5, characterized in that: When the electric heating plate is installed, a steel pipe and an iron wire support are used to support the electric heating plate, fix the electric heating plate, and cover the surface of the electric heating plate with thermal insulation cotton.

7. The electric heating-based oven drying method according to claim 1, characterized in that: In step 4, a plug hole is opened on the surface of the refractory layer, a thermocouple is placed in the plug hole, and the end of the plug hole is sealed with refractory cotton.

8. The electric heating-based oven drying method according to claim 7, characterized in that: The diameter of the plug hole is 5mm-8mm, the hole depth is 20mm from the inner surface of the heat-resistant layer, and the spacing between the plug holes is 1000mm.

9. The electric heating-based oven drying method according to claim 1, characterized in that: In the step 5, the real-time heating and cooling speed of the baking furnace curve is adjusted according to the comparison of the temperature measuring point data of the heating curve during the baking process, and the appropriate cable is selected according to the specific heating temperature, wherein the pure copper cable can withstand a temperature of 500°C, the nickel-plated cable can withstand a temperature of 600°C, and the pure nickel cable can withstand a temperature of 1000°C.

10. The electric heating-based oven drying method according to claim 1, characterized in that: In step 6, after the oven completes the recovery of the thermocouple, the jack is filled with high temperature resistant fireproof cotton, and then the cover is sealed with a high temperature resistant adhesive, and then the surface of the refractory layer is polished and cleaned, and finally a heat source is set in the furnace to insulate and maintain the refractory layer.

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