A workshop circulation system for producing silicon carbide ceramic products

Abstract

The present invention relates to a workshop circulation system for producing silicon carbide ceramic products, the workshop circulation system comprising a water circulation system, a hot air circulation system and a controller; the hot air circulation system comprises: a hot air collection unit in a sintering workshop and a hot air release unit in a drying workshop, the gas outlet of the hot air collection unit in the sintering workshop is connected with the air inlet of the hot air release unit in the drying workshop through a pipeline; the water circulation system comprises a cold water circulation pipeline in a shade drying workshop, a water circulation pipeline in a sintering workshop and a water circulation pipeline in a drying workshop, and a water circulation pipeline in a mixing workshop. The workshop circulation system of the present invention circulates and distributes heat to each workshop that needs temperature control, fully utilizes waste heat from production, and effectively reduces production costs; realizes efficient use of energy and maximization of economic benefits, effectively utilizes intelligent control of heat distribution, and reduces labor costs.

Description

Technical Field

[0001] The invention relates to the technical field of silicon carbide ceramic product production, and in particular to a workshop circulation system for producing silicon carbide ceramic products. Background Art

[0002] The production process of silicon carbide ceramic products often adopts high-temperature reaction sintering process. In the actual production process, the entire production process, including the mixing and stirring of raw materials, molding, shade drying, and drying, finally enters the sintering furnace for high-temperature reaction sintering to obtain the final product. A large amount of heat will be generated in the mixing and stirring of raw materials and the high-temperature reaction sintering process, and the corresponding temperature environment needs to be controlled by a cooling device; in the shade drying process, the shade drying workshop needs to maintain a low temperature, especially in summer, to prevent the silicon carbide products from cracking due to excessive water loss; in the drying process, the drying workshop needs a certain amount of heat to ensure a high temperature in the workshop. In the prior art, each process step workshop is independent, and the temperature conditions required for each process are mainly achieved by consuming electricity. The heat of the entire production process is not well utilized, resulting in a large amount of electricity consumption. Summary of the invention

[0003] In view of the problems existing in the above-mentioned existing production technologies, the present invention provides a workshop circulation system for producing silicon carbide ceramic products. The workshop circulation system distributes heat in each workshop that needs temperature control, fully utilizes the waste heat of production, effectively reduces production costs, and realizes efficient use of energy and maximization of economic benefits. At the same time, the effective use of intelligent control of heat distribution further reduces labor costs.

[0004] A workshop circulation system for producing silicon carbide ceramic products of the present invention comprises a water circulation system, a hot air circulation system and a controller;

[0005] The hot gas circulation system comprises: a hot gas collection unit in a sintering workshop and a hot gas release unit in a drying workshop, wherein the gas outlet of the hot gas collection unit in the sintering workshop is connected to the air inlet of the hot gas release unit in the drying workshop through a pipeline;

[0006] The hot gas circulation system generally further includes a gas driving device, such as a pump, for providing power for gas circulation within or between each unit.

[0007] The hot gas collection unit of the sintering workshop includes: a reaction sintering furnace, an air supply device and a pipeline switching structure located at the top of the sintering workshop, wherein the air supply device is connected to the gas inlet at the bottom of the furnace body at one end of the reaction sintering furnace through a first airflow pipeline, and the gas inlet of the pipeline switching structure is connected to the gas outlet at the top of the furnace body at the other end of the reaction sintering furnace through a second airflow pipeline; the airflow outlet of the air supply device is provided with a first airflow control valve for controlling the air supply amount, a first temperature sensor A is provided at the gas outlet at the top of the furnace body in the reaction sintering furnace, and a first temperature sensor B is provided on the outer wall of the reaction sintering furnace, and the temperature difference of the gas inside and outside the reaction sintering furnace is ΔT0;

[0008] The hot air release unit in the drying workshop includes a hot air dust filtering device, an injection structure embedded in the top of the drying workshop and capable of injecting filtered hot air into the drying workshop, a second air flow control valve for controlling the supply of hot air flow to the injection structure, a gas discharge structure and a third air flow control valve for controlling the gas to be discharged into the atmosphere. The injection structure is located on one side of the drying workshop. A second temperature sensor is provided in the drying workshop. The gas temperature in the drying workshop is T dry ;

[0009] The controller is electrically connected to the first temperature sensor A, the first temperature sensor B, the first airflow control valve, the second airflow control valve, the third airflow control valve and the second temperature sensor;

[0010] The controller is provided with a furnace temperature difference setting value ΔT set , and the controller calculates the temperature offset parameter ΔT=ΔT0 - ΔT set , so that the temperature offset parameter ΔT tends to zero; and the controller is preset with a first temperature offset threshold T1, and the controller is set to: when ΔT> T1, the first airflow control valve is opened, until when ΔT≤ T1, the first airflow control valve is closed;

[0011] The controller is provided with a drying second temperature offset threshold T2, and the controller is set to: T dry ≤ T2, the second air flow control valve opens and the third air flow control valve closes until T dry >T2, the second air flow control valve is closed and the third air flow control valve is opened.

[0012] In addition, the first airflow duct and the second airflow duct can be detachably connected to the furnace body of the reaction sintering furnace. At the same time, the first airflow duct and the second airflow duct can also be detachably connected to the furnace covers at the front and rear ends of the reaction sintering furnace, but the position of the first airflow duct in the reaction sintering furnace is lower than that of the second airflow duct to ensure that the gas fully absorbs the heat in the furnace.

[0013] Furthermore, in the workshop circulation system of the present invention, the gas flow rate of the first airflow pipeline is 1.5 times greater than the gas flow rate of the second airflow pipeline; by controlling the gas input of the fresh air gas of the first airflow pipeline and the gas discharge of the second airflow pipeline, it is ensured that the gas flowing into the reaction sintering furnace fully absorbs the heat in the furnace and then flows into the second airflow pipeline for heat transport. The first airflow pipeline and the second airflow pipeline are respectively provided with a gas flow detection device electrically connected to the controller.

[0014] Furthermore, in the workshop circulation system of the present invention, the water circulation system comprises: a cold water circulation pipeline of a shade drying workshop, a water circulation pipeline of a sintering workshop and a water circulation pipeline of a drying workshop which are interconnected;

[0015] The outlet of the cold water circulation pipeline of the drying workshop is connected to the inlet of the water circulation pipeline of the sintering workshop through a first water flow pipeline, the outlet of the water circulation pipeline of the sintering workshop is connected to the inlet of the water circulation pipeline of the drying workshop through a second water flow pipeline, and the outlet of the water circulation pipeline of the drying workshop is connected to the inlet of the cold water circulation pipeline of the drying workshop through a third water flow pipeline; a cooler is arranged on the third water flow pipeline.

[0016] The cold water circulation pipeline of the shade drying workshop and the water circulation pipeline of the drying workshop are preferably arranged on the lower wall of the shade drying workshop and the drying workshop, and the pipeline is fixed on the wall in an S shape to increase the heat dissipation area.

[0017] In addition, the water circulation system generally also includes a water driving device, such as a pump, that provides power for water circulation between the various water circulation pipelines.

[0018] The inlet and outlet of the water circulation pipeline of the sintering workshop are respectively provided with a pressure sensor A and a pressure sensor B, the pressure difference between the two ends of the water circulation pipeline of the sintering workshop is ΔP0, and a pressure alarm and a first water flow control valve are provided at the inlet of the water circulation pipeline of the sintering workshop, and the pressure sensor A, the pressure sensor B, the pressure alarm and the first water flow control valve are electrically connected to the controller;

[0019] The controller is preset with a pressure difference setting value ΔP of the water circulation pipeline in the sintering workshop set ; and the controller calculates the pressure offset parameter ΔP=ΔP0 - ΔP set , so that the temperature offset parameter ΔP tends to zero; and the controller is preset with a first pressure offset threshold P1, and the controller is set to: when ΔP> P1, the first water flow control valve is closed, and the pressure alarm sounds an alarm.

[0020] Through pressure monitoring by pressure sensors, we can prevent the freezing of pipelines outside the workshop from blocking the pipelines and causing safety hazards, especially in winter.

[0021] Furthermore, in the workshop circulation system of the present invention, the first water flow pipeline is provided with a bypass pipeline, the bypass pipeline is provided with a bypass valve, the controller controls the bypass valve in association, and the bypass valve opens when the pressure alarm sounds an alarm. The bypass pipeline is provided to prevent the first water flow pipeline from being blocked and thus not affecting the production process.

[0022] Furthermore, in the workshop circulation system of the present invention, the water circulation system also includes a mixing workshop water circulation pipeline, the outlet of the mixing workshop water circulation pipeline is connected to the inlet of the drying workshop water circulation pipeline; a water supply device is provided between the cooler and the outlet of the drying workshop water circulation pipeline. The mixing workshop water circulation pipeline is a cooling structure for the mixing and stirring process, and the heat brought out by the mixing workshop water circulation pipeline is also used for heating the drying workshop.

[0023] Furthermore, in the workshop circulation system described in the present invention, the outlet of the water supply device is provided with a water flow control valve and a third pressure sensor for sensing the pressure P3 of the third water flow pipe, the controller is electrically connected to the water flow control valve and the third pressure sensor, and the controller is provided with a second pressure offset threshold P2, when P3<P2, the water flow control valve is opened, until P3≥P2, the water flow control valve is closed.

[0024] Furthermore, in the workshop circulation system described in the present invention, the injection structure includes at least two injection units, and the injection units are provided with uniform injection holes on the sides of the drying workshop; the pipeline transfer structure is set on the top of the reaction sintering workshop through a track.

[0025] Furthermore, in the workshop circulation system of the present invention, the first pressure deviation threshold value P1 is 0.3 times the maximum pressure that the water flow pipeline can withstand.

[0026] Furthermore, in the workshop circulation system of the present invention, the furnace temperature difference setting value ΔTset is 3-10°C, and the first temperature offset threshold value T1 is 5°C.

[0027] Furthermore, in the workshop circulation system described in the present invention, the second drying temperature offset threshold T2 is 2°C~6°C.

[0028] Compared with the prior art, the present invention has the following beneficial technical effects:

[0029] The workshop circulation system of the present invention distributes heat in each workshop that needs temperature control, making full use of production waste heat, effectively reducing production costs, and achieving efficient use of energy and maximizing economic benefits. In addition, the effective use of intelligent control of heat distribution further reduces labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the workshop circulation system of the present invention;

[0031] Figure 2 It is a schematic diagram of the hot gas collection unit of the sintering workshop according to the present invention;

[0032] Among them: 1. Shade drying workshop, 2. Drying workshop, 3. Hot air collection unit of sintering workshop, 4. First water flow pipeline, 5. Pipeline, 6. Hot air release unit of drying workshop, 7. Bypass pipeline, 8. Bypass valve, 9. Third water flow pipeline, 10. Second water flow pipeline, 11. Reaction sintering workshop;

[0033] 301. Reaction sintering furnace, 302. Pipeline switching structure, 303. Air supply device, 304. First airflow pipeline, 305. Second airflow pipeline, 306. First airflow control valve. DETAILED DESCRIPTION

[0034] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described in detail with reference to the accompanying drawings. The described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. If no specific conditions are specified in the specific implementation method, it shall be carried out under normal conditions or conditions recommended by the manufacturer. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described exemplarily below do not represent all embodiments consistent with the present disclosure. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the attached claims. The terms used in the present disclosure are for the purpose of describing specific embodiments only and are not intended to limit the present disclosure.

[0035] Example 1, a workshop circulation system for producing silicon carbide ceramic products of the present invention, such as Figure 1 and Figure 2 As shown, the workshop circulation system includes a water circulation system, a hot air circulation system and a controller; in this embodiment 1, the water circulation system and the hot air circulation system both use pumps to drive the circulation of the fluid.

[0036] The hot gas circulation system comprises: a hot gas collecting unit 3 of the sintering workshop and a hot gas releasing unit 6 of the drying workshop, and the gas outlet of the hot gas collecting unit 3 of the sintering workshop is connected with the air inlet of the hot gas releasing unit 6 of the drying workshop through a pipeline 5;

[0037] The hot gas collection unit 3 of the sintering workshop includes: a reaction sintering furnace 301, an air supply device 303 and a pipeline switching structure 302 located at the top of the reaction sintering workshop 11, the air supply device 303 is connected to the gas inlet at the bottom of the furnace body at one end of the reaction sintering furnace 301 through a first airflow pipeline 304, and the gas inlet of the pipeline switching structure 302 is connected to the gas outlet at the top of the furnace body at the other end of the reaction sintering furnace 301 through a second airflow pipeline 305; the airflow outlet of the air supply device 303 is provided with a first airflow control valve 306 for controlling the air supply amount, a first temperature sensor A is provided at the gas outlet at the top of the furnace body in the reaction sintering furnace, a first temperature sensor B is provided on the outer wall of the reaction sintering furnace, and the gas temperature difference between the inside and outside of the reaction sintering furnace is ΔT0;

[0038] The hot air release unit 6 in the drying workshop includes a hot air dust filtering device, an injection structure embedded in the top of the drying workshop 2 and capable of injecting the filtered hot air into the drying workshop 2, a second air flow control valve for controlling the supply of hot air flow to the injection structure, a gas discharge structure and a third air flow control valve for controlling the gas to be discharged into the atmosphere. The injection structure is located on one side of the drying workshop 2. A second temperature sensor is provided in the drying workshop 2. The gas temperature in the drying workshop 2 is T dry ;

[0039] The controller is electrically connected to the first temperature sensor A, the first temperature sensor B, the first air flow control valve 306, the second air flow control valve, the third air flow control valve and the second temperature sensor;

[0040] The above controller is set with a furnace temperature difference setting value ΔT set , and the above controller calculates the temperature offset parameter ΔT=ΔT0 - ΔT set , so that the temperature offset parameter ΔT tends to zero; and the controller is preset with a first temperature offset threshold T1, and the controller is set to: when ΔT> T1, the first airflow control valve 306 is opened, until when ΔT≤ T1, the first airflow control valve 306 is closed;

[0041] The controller is provided with a drying second temperature deviation threshold T2, and the controller is set to: T dry ≤ T2, the second air flow control valve opens and the third air flow control valve closes until T dry >T2, the second air flow control valve is closed and the third air flow control valve is opened.

[0042] In addition, the first airflow duct 304 and the second airflow duct 305 are detachably connected to the furnace body of the reaction sintering furnace 301. At the same time, the first airflow duct 304 and the second airflow duct 305 can also be detachably connected to the furnace covers at the front and rear ends of the reaction sintering furnace 301, but the position of the first airflow duct 304 in the reaction sintering furnace 301 is lower than the position of the second airflow duct 305 in the reaction sintering furnace 301 to ensure that the heat in the furnace is fully collected by the sintering workshop hot gas collection unit 3.

[0043] In this embodiment 1, the gas flow rate of the first airflow duct 304 is 1.5 times greater than the gas flow rate of the second airflow duct 305; by controlling the gas input of the fresh air gas of the first airflow duct 304 and the gas discharge of the second airflow duct 305, it is ensured that the gas flowing into the reaction sintering furnace fully absorbs the heat in the furnace and then flows into the second airflow duct 305 for heat transport. The first airflow duct 304 and the second airflow duct 305 are respectively provided with a gas flow detection device electrically connected to the controller.

[0044] In this embodiment 1, the water circulation system includes: a cold water circulation pipeline of a shade drying workshop, a water circulation pipeline of a sintering workshop and a water circulation pipeline of a drying workshop which are interconnected;

[0045] The outlet of the cold water circulation pipeline of the above-mentioned drying workshop is connected to the inlet of the water circulation pipeline of the above-mentioned sintering workshop through the first water flow pipeline 4, the outlet of the water circulation pipeline of the above-mentioned sintering workshop is connected to the inlet of the water circulation pipeline of the above-mentioned drying workshop through the second water flow pipeline 10, and the outlet of the water circulation pipeline of the above-mentioned drying workshop is connected to the inlet of the cold water circulation pipeline of the above-mentioned drying workshop through the third water flow pipeline 9; a cooler is arranged on the above-mentioned third water flow pipeline 9.

[0046] The cold water circulation pipeline of the drying workshop and the water circulation pipeline of the drying workshop are preferably arranged on the walls of the drying workshop 1 and the drying workshop 2 close to the ground. The pipelines are fixed on the walls in an S shape to increase the heat dissipation area.

[0047] The inlet and outlet of the water circulation pipeline of the sintering workshop are respectively provided with a pressure sensor A and a pressure sensor B, the pressure difference between the two ends of the water circulation pipeline of the sintering workshop is ΔP0, and a pressure alarm and a first water flow control valve are provided at the inlet of the water circulation pipeline of the sintering workshop. The pressure sensor A, the pressure sensor B, the pressure alarm and the first water flow control valve are electrically connected to the controller;

[0048] The above controller is preset with the pressure difference setting value ΔP of the water circulation pipeline in the sintering workshop set ; and the above controller calculates the pressure offset parameter ΔP = ΔP0 - ΔPset , so that the temperature offset parameter ΔP tends to zero; and the controller is preset with a first pressure offset threshold P1, and the controller is set to: when ΔP> P1, the first water flow control valve is closed, and the pressure alarm sounds an alarm.

[0049] Through pressure monitoring by pressure sensors, we can prevent the freezing of pipelines outside the workshop from blocking the pipelines and causing safety hazards, especially in winter.

[0050] In some embodiments, a bypass pipe 7 is connected to the first water flow pipe 4, and a bypass valve 8 is provided on the bypass pipe 7. The controller is electrically connected to control the bypass valve 8. When the pressure alarm sounds an alarm, the bypass valve 8 opens. The bypass pipe 7 is provided to prevent the first water flow pipe 4 from being blocked to prevent affecting normal production.

[0051] In some embodiments, the water circulation system further includes a water circulation pipeline in a mixing workshop, the outlet of which is connected to the inlet of the water circulation pipeline in a drying workshop; a water supply device is provided between the cooler and the outlet of the water circulation pipeline in the drying workshop. The water circulation pipeline in the mixing workshop is a cooling structure for the mixing and stirring process, and the heat brought out by the water circulation pipeline in the mixing workshop is also used to heat up the drying workshop.

[0052] In some embodiments, the outlet of the water supply device is provided with a water flow control valve and a third pressure sensor for sensing the pressure P3 of the third water flow pipe 9. The controller is electrically connected to the water flow control valve and the third pressure sensor. The controller is provided with a second pressure offset threshold value P2. When P3<P2, the water flow control valve is opened until P3≥P2, and the water flow control valve is closed.

[0053] In some embodiments, the injection structure includes at least two injection units, and the injection units are provided with uniform injection holes on the sides of the drying workshop; the pipeline transfer structure is arranged on the top of the reaction sintering workshop 11 through a track.

[0054] In some embodiments, the first pressure deviation threshold value P1 is 0.3 times the maximum pressure that the water flow pipeline can withstand.

[0055] In some embodiments, the furnace temperature difference setting value ΔT set is 3~10℃, and the first temperature offset threshold T1 is 5℃.

[0056] In some embodiments, the drying second temperature offset threshold T2 is 2°C to 6°C.

[0057] The workshop circulation system of the present invention distributes heat in each workshop that needs temperature control, making full use of production waste heat, effectively reducing production costs, and realizing efficient use of energy and maximizing economic benefits. At the same time, it effectively uses intelligent control of heat distribution to reduce labor costs.

Claims

1. A workshop circulation system for producing silicon carbide ceramic products, characterized in that: The workshop circulation system includes a water circulation system, a hot air circulation system and a controller; The hot gas circulation system comprises: a hot gas collection unit in a sintering workshop and a hot gas release unit in a drying workshop, wherein the gas outlet of the hot gas collection unit in the sintering workshop is connected to the air inlet of the hot gas release unit in the drying workshop through a pipeline; The hot gas collection unit of the sintering workshop includes: a reaction sintering furnace, an air supply device and a pipeline switching structure located at the top of the sintering workshop, wherein the air supply device is connected to the gas inlet at the bottom of the furnace body at one end of the reaction sintering furnace through a first airflow pipeline, and the gas inlet of the pipeline switching structure is connected to the gas outlet at the top of the furnace body at the other end of the reaction sintering furnace through a second airflow pipeline; the airflow outlet of the air supply device is provided with a first airflow control valve for controlling the air supply amount, a first temperature sensor A is provided at the gas outlet at the top of the furnace body in the reaction sintering furnace, and a first temperature sensor B is provided on the outer wall of the reaction sintering furnace, and the temperature difference of the gas inside and outside the reaction sintering furnace is ΔT0; The hot air release unit in the drying workshop includes a hot air dust filtering device, an injection structure embedded in the top of the drying workshop and capable of injecting filtered hot air into the drying workshop, a second air flow control valve for controlling the supply of hot air flow to the injection structure, a gas discharge structure and a third air flow control valve for controlling the gas to be discharged into the atmosphere. The injection structure is located on one side of the drying workshop. A second temperature sensor is provided in the drying workshop. The gas temperature in the drying workshop is T dry ; The controller is electrically connected to the first temperature sensor A, the first temperature sensor B, the first airflow control valve, the second airflow control valve, the third airflow control valve and the second temperature sensor; The controller is provided with a furnace temperature difference setting value ΔT set , and the controller calculates the temperature offset parameter ΔT=ΔT0- ΔT set , so that the temperature offset parameter ΔT tends to zero; and the controller is preset with a first temperature offset threshold T1, and the controller is set to: when ΔT> T1, the first airflow control valve is opened, until when ΔT≤ T1, the first airflow control valve is closed; The controller is provided with a drying second temperature offset threshold T2, and the controller is set to: T dry ≤ T2, the second air flow control valve opens and the third air flow control valve closes until T dry >T2, the second air flow control valve is closed, and the third air flow control valve is opened; the gas flow rate of the first air flow pipeline is greater than 1.5 times the gas flow rate of the second air flow pipeline; The first airflow pipeline and the second airflow pipeline are respectively provided with a gas flow detection device electrically connected to the controller; the water circulation system comprises: a cold water circulation pipeline of a drying workshop, a water circulation pipeline of a sintering workshop and a water circulation pipeline of a drying workshop which are interconnected; The outlet of the cold water circulation pipeline of the air drying workshop is connected to the inlet of the water circulation pipeline of the sintering workshop through a first water flow pipeline, the outlet of the water circulation pipeline of the sintering workshop is connected to the inlet of the water circulation pipeline of the drying workshop through a second water flow pipeline, and the outlet of the water circulation pipeline of the drying workshop is connected to the inlet of the cold water circulation pipeline of the air drying workshop through a third water flow pipeline; The third water flow pipeline is provided with a cooler; The inlet and outlet of the water circulation pipeline of the sintering workshop are respectively provided with a pressure sensor A and a pressure sensor B, the pressure difference between the two ends of the water circulation pipeline of the sintering workshop is ΔP0, and a pressure alarm and a first water flow control valve are provided at the inlet of the water circulation pipeline of the sintering workshop, and the pressure sensor A, the pressure sensor B, the pressure alarm and the first water flow control valve are electrically connected to the controller; The controller is preset with a pressure difference setting value ΔP of the water circulation pipeline in the sintering workshop set ; and the controller calculates the pressure offset parameter ΔP=ΔP0- ΔP set , so that the temperature offset parameter ΔP tends to zero; and the controller is preset with a first pressure offset threshold P1, and the controller is set to: when ΔP> P1, the first water flow control valve is closed, and the pressure alarm sounds an alarm.

2. The workshop circulation system according to claim 1, characterized in that: The first water flow pipeline is provided with a bypass pipeline, and the bypass pipeline is provided with a bypass valve. The controller controls the bypass valve in a related manner. When the pressure alarm sounds an alarm, the bypass valve opens.

3. The workshop circulation system according to claim 2, characterized in that: The water circulation system also includes a water circulation pipeline in a mixing workshop, and the outlet of the water circulation pipeline in the mixing workshop is connected to the inlet of the water circulation pipeline in the drying workshop; A water supply device is arranged between the cooler and the outlet of the water circulation pipeline of the drying workshop.

4. The workshop circulation system according to claim 3, characterized in that: The outlet of the water supply device is provided with a water flow control valve and a third pressure sensor for sensing the pressure P3 of the third water flow pipe. The controller is electrically connected to the water flow control valve and the third pressure sensor. The controller is provided with a second pressure offset threshold value P2. When P3<P2, the water flow control valve is opened until P3≥P2, and the water flow control valve is closed.

5. The workshop circulation system according to claim 4, characterized in that: The spraying structure comprises at least two spraying units, and the spraying units are provided with uniform spraying holes on the sides facing the drying workshop; the pipeline transfer structure is arranged on the top of the sintering workshop through a track.

6. The workshop circulation system according to claim 5, characterized in that: The first pressure deviation threshold value P1 is 0.3 times the maximum pressure that the water flow pipeline can withstand.

7. The workshop circulation system according to claim 6, characterized in that: The furnace temperature difference setting value ΔT set The first temperature deviation threshold T1 is 3-10°C, and the first temperature deviation threshold T1 is 5°C.

8. The workshop circulation system according to claim 7, characterized in that: The second drying temperature offset threshold value T2 is 2°C to 6°C.

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