A biphenyl furnace

Abstract

The application discloses a diphenyl furnace, and relates to the technical field of spinning processing equipment, which comprises a diphenyl furnace body, wherein the diphenyl furnace body comprises a heating furnace, a condensing device, a liquid storage cavity, a diphenyl supplement box, a heat-conducting oil circulation pipeline, a first exhaust pipe and a second exhaust pipe. The first exhaust pipe and the second exhaust pipe are capable of being opened and closed, and the opening and closing of the first exhaust pipe and the second exhaust pipe can make the water vapor and the inferior gas generated when the liquid diphenyl in the liquid storage cavity is heated be sequentially discharged from the diphenyl furnace body, so that the loss of diphenyl caused by the water vapor and the inferior gas during the discharging process is effectively improved.

Description

Technical Field

[0001] This application relates to the technical field of spinning equipment, and in particular to a biphenyl furnace. Background Technology

[0002] In the spunbond nonwoven fabric production process, biphenyl heating is used to heat equipment such as the melt filter, melt distribution pipe, and box system. Heating biphenyl to its vaporization temperature typically takes 22-24 hours. Under normal circumstances, the biphenyl boiler heats up to above 258°C to vaporize. The biphenyl vapor rises through pipelines to the heating point of the spinning equipment to provide heat and insulation, and then enters the condenser to liquefy and return to the heating furnace.

[0003] Even if a vacuum is applied to the furnace before heating, water vapor and some non-condensable harmful gases will be generated during the vaporization of biphenyl. Since the water vapor and harmful gases remain in the pipes, they will block the smooth flow of biphenyl vapor. Therefore, the water vapor and harmful gases in the pipes need to be discharged during the biphenyl heating process.

[0004] The conventional approach is to purge the gas when the temperature reaches 280°C. This requires opening the valve at the top of the unit multiple times, which is extremely unsafe. Furthermore, a large amount of biphenyl vapor is released into the air during the purging process, causing environmental pollution. Additionally, biphenyl leakage during purging can result in a lack of biphenyl in the casing. Summary of the Invention

[0005] In order to improve the biphenyl leakage caused by the emission of water vapor and harmful gases during the heating process of the biphenyl furnace, this application provides a biphenyl furnace.

[0006] This application provides a biphenyl furnace, which adopts the following technical solution:

[0007] A biphenyl furnace includes a furnace body, which includes a heating furnace and a discharge pipe for discharging biphenyl vapor; a condensing device, which includes an inlet pipe for discharging used biphenyl vapor; a liquid storage chamber for storing liquid biphenyl, which is connected to the condensing device and the heating furnace; a biphenyl replenishment tank for storing liquid biphenyl, which is connected to the liquid storage chamber; a heat transfer oil circulation pipeline, one end of which is connected to a heat transfer oil heating device, and the other end of which passes sequentially through the heating furnace, the biphenyl replenishment tank, the liquid storage chamber, and the condensing device before connecting to the heat transfer oil heating device; a first exhaust pipe connected to the liquid storage chamber and capable of being opened and closed; and a second exhaust pipe connected to a cooling device and capable of being opened and closed.

[0008] By adopting the above technical solution, after the heat transfer oil is heated by the heat transfer oil heating device, it flows sequentially through the heating furnace, biphenyl replenishment tank, storage chamber, and condensation device via the heat transfer oil circulation pipeline. This allows the heat transfer oil to heat the biphenyl in the heating furnace, causing it to vaporize. The vaporized biphenyl then enters the spinning equipment through the discharge pipe to provide heat and insulation for the spinning equipment. The heat transfer oil then enters the biphenyl replenishment tank to heat the liquid biphenyl inside, and subsequently enters the storage chamber to heat the liquid biphenyl there. When the liquid biphenyl in the storage chamber is heated to a temperature greater than 100 degrees Celsius, the first exhaust pipe is opened to discharge the water vapor from the storage chamber. After the steam is exhausted, the first exhaust pipe is closed. The heat transfer oil passes through the heating furnace, biphenyl replenishment tank, and storage chamber in sequence, and its original heat is absorbed by the biphenyl, causing the temperature of the heat transfer oil to drop. The cooled heat transfer oil then enters the condensation device to cool and condense the biphenyl vapor that enters from the spinning equipment. The biphenyl vapor is liquefied in the condensation device and returns to the storage chamber. During the process of biphenyl vapor entering the condensation device through the inlet pipe and being condensed, the second exhaust pipe is intermittently opened to allow the uncondensed inferior gases to be discharged, effectively improving the problem of biphenyl loss in the heating furnace caused by the traditional multiple exhaust method of draining steam and inferior gases.

[0009] Optionally, a spraying device is provided inside the heating furnace. The spraying device includes a spray pipe vertically installed inside the heating furnace, and multiple nozzles are evenly spaced along the vertical direction on the spray pipe. The liquid storage chamber is located outside the heating furnace, and a first conduit is provided between the heating furnace and the liquid storage chamber. A drive source for transferring liquid biphenyl to the spray pipe is provided inside the liquid storage chamber.

[0010] By adopting the above technical solution, the liquid biphenyl in the storage chamber flows into the heating furnace through the first conduit and enters the spray pipe under the action of the driving source. The liquid biphenyl is sprayed into the middle of the heating furnace in the form of water mist through the nozzle on the spray pipe, which increases the contact area between the liquid biphenyl and the heating furnace during heating, so that it can be heated quickly and evenly, and achieves the effect of efficient vaporization.

[0011] Optionally, the inner cavity of the heating furnace is cylindrical, and multiple spray pipes are arranged at equal intervals around the axis of the inner cavity of the heating furnace. The heat transfer oil circulation pipeline includes heating pipes located between the spray pipes. The heating pipes are spiral tubes with vertical axes, and the spiral tubes formed by the heating pipes gradually expand outward in the vertical direction.

[0012] By adopting the above technical solution, the heating tube is a vertically oriented spiral tube, which increases the length of the heating tube that can be accommodated in a certain volume of the heating furnace cavity; the spiral formed by the heating tube gradually expands outward in the vertical direction, and the distance between the heating tube and the heating furnace cavity gradually decreases, thereby increasing the thermal contact surface between the heating tube and biphenyl, and realizing the efficient vaporization of liquid biphenyl.

[0013] Optionally, the heat transfer oil circulation pipeline includes a preheating pipe located inside the biphenyl replenishment tank and connected to the heating pipe, an insulation pipe located inside the liquid storage chamber and connected to the preheating pipe, and a first condensing pipe located inside the condensing device and connected to the insulation pipe. The preheating pipe, the insulation pipe, and the condensing pipe are all bent into a corrugated shape.

[0014] By adopting the above technical solution, the preheating pipe and the insulation pipe are bent into a corrugated shape and distributed in the body of the biphenyl furnace. This increases the length of the preheating pipe and the insulation pipe that are respectively arranged in the biphenyl replenishment tank and the storage chamber, increases the heat release time of the heat transfer oil in the biphenyl replenishment tank and the storage chamber, and also increases the heating contact area between the heat transfer oil and biphenyl in the preheating pipe and the insulation pipe, thereby improving the heating efficiency of the heat transfer oil for biphenyl. The condenser pipe is also folded and evenly distributed in a corrugated shape in the condensation device to improve the condensation efficiency of the condensation device for biphenyl vapor.

[0015] Optionally, the condensation device includes a recovery pipe, the end of which is away from the condensation device and connected to the liquid storage chamber, and a second exhaust pipe and the recovery pipe are connected and interconnected.

[0016] By adopting the above technical solution, the recovery pipe allows the liquefied biphenyl in the condenser to return to the storage chamber, and the second exhaust pipe connected to the recovery pipe is used to discharge the non-condensable bad gas generated during the heating process of biphenyl.

[0017] Optionally, a first air control valve is provided on the first exhaust pipe, and a second air control valve is provided on the second exhaust pipe.

[0018] By adopting the above technical solution, the first gas control valve and the second gas control valve respectively control the gas flow between the first exhaust pipe and the second exhaust pipe and the outside, and control the water vapor and bad gas to be discharged in sequence during the process of biphenyl heating and condensation, so as to improve the phenomenon of biphenyl vapor leakage during the exhaust process.

[0019] Optionally, a first temperature sensor is installed in the liquid storage chamber, and a second temperature sensor is installed in the biphenyl replenishment tank.

[0020] By adopting the above technical solution, the first temperature sensor is used to detect the temperature of liquid biphenyl in the storage chamber to transmit a signal on whether to open or close the first control valve; the second temperature sensor is used to detect the temperature of liquid biphenyl in the biphenyl replenishment tank to determine the liquid biphenyl in the biphenyl replenishment tank and transmit a signal on whether it has been heated to a suitable temperature.

[0021] Optionally, a flow control valve is provided between the biphenyl replenishment tank and the storage chamber to control the liquid flow between the biphenyl replenishment tank and the storage chamber.

[0022] By adopting the above technical solution, the flow control valve is used to control the liquid biphenyl in the biphenyl replenishment tank to enter the storage chamber. When the biphenyl in the biphenyl replenishment tank is heated to a suitable temperature, the flow control valve is opened to allow the biphenyl in the biphenyl replenishment tank to be replenished into the storage chamber.

[0023] Optionally, a first branch pipe is connected between the heating pipe and the insulation pipe; a second branch pipe connected to the heat transfer oil heating device is connected to the insulation pipe, and valves are provided on both the first branch pipe and the second branch pipe.

[0024] By adopting the above technical solution, the first and second diversion pipes are used in conjunction with the valve to change the flow route of the heat transfer oil in the heat transfer oil circulation pipeline. This allows the heat transfer oil to flow through the biphenyl replenishment tank, the storage chamber, and the condenser pipe before returning to the heat transfer oil heating device for reheating when biphenyl needs to be added. When biphenyl does not need to be added to the storage chamber, the heat transfer oil can flow from the heating furnace into the storage chamber and then directly into the heat transfer oil heating device, thereby reducing the energy consumption of the heat transfer oil heating device when reheating the heat transfer oil.

[0025] Optionally, the condensing device is also provided with a second condenser tube, which is arranged alternately with the first condenser tube. The second condenser tube includes a condensate inlet end and a condensate outlet end.

[0026] By adopting the above technical solution, when biphenyl is not added to the storage chamber, the heat transfer oil in the heating furnace flows directly back to the heat transfer oil heating device from the insulation pipe. At this time, condensate is added to the second condenser tube, so that the biphenyl vapor flowing into the condensation device is condensed in the second condenser tube. Of course, the second condenser tube and the first condenser tube can be used at the same time to improve the condensation efficiency.

[0027] In summary, this application includes at least one of the following beneficial effects:

[0028] 1. The liquid storage chamber is connected to a first exhaust pipe that can be opened and closed, and the condensation device is connected to a second exhaust pipe that can be opened and closed. During the operation of the biphenyl furnace, the water vapor and bad gas generated by the liquid biphenyl in the liquid storage chamber when it is heated can be discharged from the biphenyl furnace body in sequence by controlling the opening and closing of the first exhaust pipe and the second exhaust pipe, which effectively improves the biphenyl loss caused by the drainage of steam or bad gas.

[0029] 2. The heat transfer oil passes through the heating furnace, biphenyl replenishment tank and storage chamber in sequence via the heat transfer oil circulation pipeline for heat preservation and heating of liquid biphenyl; after cooling, the heat transfer oil then enters the condensation device to cool and condense the biphenyl vapor entering the condensation device from the spinning equipment; this improves the heat utilization rate of the heat transfer oil inside the biphenyl furnace body and eliminates the need for other heat sources, saving manufacturing costs;

[0030] 3. The heating furnace is equipped with a spraying device, which allows the liquid biphenyl in the storage chamber to enter the heating furnace in the form of water mist; the heating tube is a vertical spiral tube, and the spiral tube formed by the heating tube gradually expands outward in the vertical direction, which increases the contact area between the liquid biphenyl and the heating furnace during heating, so that it can be heated quickly and evenly, and achieve the effect of efficient vaporization of biphenyl. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the external structure of the biphenyl furnace body in Embodiment 1 of this application;

[0032] Figure 2 This is a schematic diagram showing the distribution of the internal heating furnace, heat transfer oil heating device, biphenyl replenishment tank, liquid storage chamber, and condensation device of the biphenyl furnace body in Embodiment 1 of this application;

[0033] Figure 3 This is a cross-sectional schematic diagram of the biphenyl furnace body of Embodiment 1 of this application;

[0034] Figure 4 This is a cross-sectional schematic diagram of the biphenyl furnace body of Embodiment 2 of this application.

[0035] Explanation of reference numerals in the attached drawings: 1. Biphenyl furnace body; 11. Heating furnace; 111. Spray pipe; 112. Nozzle; 113. Gas outlet pipe; 114. Check valve; 12. Liquid storage chamber; 121. First exhaust pipe; 122. First gas control valve; 123. First temperature sensor; 13. Condensation device; 131. Gas inlet pipe; 132. Second exhaust pipe; 133. First conduit; 134. Vortex pump; 135. First condenser pipe; 136. Recovery pipe; 137. Second gas control valve; 138. Second condenser tube; 1381. Condensate inlet; 1382. Condensate outlet; 14. Biphenyl replenishment tank; 141. Connecting pipe; 142. Flow control valve; 143. Second temperature sensor; 15. Heat transfer oil heating device; 16. Heat transfer oil circulation pipeline; 161. Heating tube; 162. Insulation tube; 163. Preheating tube; 164. First branch pipe; 165. Second branch pipe; 166. Valve. Detailed Implementation

[0036] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0037] Example 1:

[0038] This application discloses a biphenyl furnace, referring to... Figure 1 and Figure 2A biphenyl furnace includes a furnace body 1, which includes a heating furnace 11 with an exhaust pipe 113, a condensing device 13 for condensing biphenyl vapor, a storage chamber 12 for storing liquid biphenyl, a heat transfer oil heating device 15 for heating heat transfer oil, and a biphenyl replenishment tank 14 connected to the storage chamber 12. The condensing device 13 includes an inlet pipe 131 for discharging used biphenyl vapor. The storage chamber 12 is also connected to the condensing device 13 and the heating furnace 11. The furnace body 1 also includes a heat transfer oil circulation pipe 16, one end of which is connected to the heat transfer oil heating device 15, and the other end passes sequentially through the heating furnace 11, the biphenyl replenishment tank 14, the storage chamber 12, and the condensing device 13 before connecting to the heat transfer oil heating device 15 again. The storage chamber 12 is connected to a first exhaust pipe 121 that can be opened and closed, and the condensing device 13 is connected to a second exhaust pipe 132 that can be opened and closed.

[0039] The heat transfer oil is heated in the heat transfer oil heating device 15, and then heated in sequence through the heat transfer oil circulation pipeline 16 to the heating furnace 11, the biphenyl replenishment tank 14 and the storage chamber 12. After the heat is absorbed, the heat transfer oil finally enters the condenser tube to cool and condense the biphenyl vapor entering the condenser device 13 from the spinning equipment, so that the gas pressure in the biphenyl furnace body 1 remains stable. When the heat transfer oil heats the biphenyl in the storage chamber 12 to above 100 degrees Celsius, the first exhaust pipe 121 is opened to discharge the water vapor inside the biphenyl furnace body 1. After the water vapor is discharged, the first exhaust valve is closed, allowing the heat transfer oil to vaporize the biphenyl in the heating furnace 11. When the biphenyl vapor enters the condenser 13 and is condensed, the second exhaust pipe 132 is opened to discharge the non-condensable inferior gas from the biphenyl furnace body 1. During the entire process of the heat transfer oil entering the heat transfer oil circulation pipe 16, water vapor and inferior gas are discharged sequentially, reducing the uneven heating and poor circulation of biphenyl vapor in the biphenyl furnace caused by water vapor and inferior gas, and minimizing the possibility of biphenyl vapor leakage due to exhaust.

[0040] Reference Figure 3 The heating furnace 11 is a hollow cylinder. Multiple vertically arranged spray pipes 111 are fixedly arranged at equal intervals around the axis of the inner cavity of the heating furnace 11. In this embodiment, there are two spray pipes. Multiple interconnected nozzles 112 are welded at equal intervals in the vertical direction on the side of the spray pipes 111 away from the cavity wall of the heating furnace 11. The liquid storage chamber 12 is located on one side of the heating furnace 11. A first conduit 133 is installed between the heating furnace 11 and the liquid storage chamber 12. A drive source is installed at one end of the first conduit 133 close to the heating furnace 11. In this embodiment, the drive source is specifically set as a vortex pump 134. The vortex pump 134 can transfer the liquid biphenyl in the liquid storage chamber 12 to the spray pipes 111 in the heating furnace 11. Under the pressure of the vortex pump 134, the liquid biphenyl will enter the heating furnace 11 in the form of water mist from the nozzles 112, increasing the thermal contact surface in the inner cavity of the heating furnace 11.

[0041] Reference Figure 3 The heat transfer oil circulation pipeline 16 includes a heating pipe 161 disposed between the spray pipes 111. One end of the heating pipe 161 is connected to the heat transfer oil heating device 15. The heat transfer oil heating device 15 heats the heat transfer oil by electric heating. After the heat transfer oil is heated by the heat transfer oil heating device 15, it flows into the heat transfer pipe and serves as a heat source in the heating furnace 11. Heating tube 161 is a vertically oriented threaded tube. The threaded tube formed by heating tube 161 gradually expands outward in the vertical direction, gradually filling the entire inner cavity of heating furnace 11. This increases the thermal contact area between liquid biphenyl and heating tube 161, reduces the gap between heating tubes 161, and allows liquid biphenyl to be heated quickly and evenly in heating furnace 11. A gas stop valve 114 is installed at the end of the gas outlet pipe 113 away from heating furnace 11. When liquid biphenyl in heating furnace 11 is vaporized, the gas stop valve 114 is opened to allow biphenyl vapor to be discharged from gas outlet pipe 113. The discharged biphenyl vapor enters the spinning equipment to heat and keep the spinning equipment warm.

[0042] Reference Figure 1 and Figure 3 The heat transfer oil circulation pipeline 16 also includes an insulation pipe 162 disposed within the liquid storage chamber 12. The heat transfer oil can flow into the insulation pipe 162 to heat the liquid biphenyl in the liquid storage chamber 12. A first temperature sensor 123 is installed in the liquid storage chamber 12. A first exhaust pipe 121 is welded to the side of the liquid storage chamber 12 away from the heating furnace 11, and a first gas control valve 122 is installed on the first exhaust pipe 121. The first gas control valve 122 is an automatic control valve. In this embodiment, the first gas control valve 122 is specifically a solenoid valve. After the first temperature sensor 123 transmits a signal, the circuit module disposed in the biphenyl furnace body 1 can control the opening and closing of the first gas control valve 122.

[0043] Reference Figure 3The biphenyl replenishment tank 14 installed inside the biphenyl furnace body 1 enables the biphenyl furnace to replenish biphenyl without stopping the furnace. The end of the biphenyl replenishment tank 14 near the condenser 13 is connected to a replenishment pipe that can communicate with the outside of the biphenyl furnace body 1. The heat transfer oil circulation pipeline 16 includes a preheating pipe 163 installed in the biphenyl replenishment tank 14. One end of the preheating pipe 163 is connected to the heating pipe 161, and the other end is connected to the insulation pipe 162. The heat transfer oil can flow from the heating pipe 161 into the preheating pipe 163 to heat up the liquid biphenyl in the biphenyl replenishment tank 14, so that the temperature difference between the liquid biphenyl in the biphenyl replenishment tank 14 and the liquid biphenyl in the storage chamber 12 is small. A connecting pipe 141 is provided between the biphenyl replenishment tank 14 and the storage chamber 12, and a flow control valve 142 is provided on the connecting pipe 141. A second temperature sensor 143 for detecting the temperature of the liquid biphenyl in the biphenyl replenishment tank 14 is installed in the biphenyl replenishment tank 14. In this embodiment, the flow control valve 142 can also be an automatic control valve. In this embodiment, a solenoid valve is used, and the second temperature sensor 143 can transmit a signal to the circuit module to control the opening and closing of the flow control valve 142.

[0044] Both the preheating pipe 163 and the insulation pipe 162 are bent corrugated tubes and are evenly distributed inside the biphenyl furnace body 1 to increase the contact area between the heat transfer oil in the preheating pipe 163 and the insulation pipe 162 and the biphenyl in the biphenyl furnace body 1, thereby improving the heating efficiency of the heat transfer oil.

[0045] Reference Figure 1 and Figure 3 The condenser 13 is equipped with a first condenser pipe 135. One end of the first condenser pipe 135 is connected to the heat transfer oil heating device 15, and the other end is connected to the insulation pipe 162. The condenser pipe is not bent and has a corrugated shape, uniformly condensing the inner cavity of the condenser 13. A recovery pipe 136 is installed on the side of the condenser 13 near the liquid storage chamber 12. The end of the recovery pipe 136 away from the condenser chamber is connected to the liquid storage chamber 12. When the biphenyl vapor entering the condenser 13 is condensed and liquefied, it flows back to the liquid storage chamber 12 through the recovery pipe 136. A second exhaust pipe 132 is vertically welded to the recovery pipe 136, and a second gas control valve 137 is installed on the end of the second exhaust pipe 132 away from the recovery pipe 136. When the biphenyl vapor is liquefied, the inferior gas generated by the heating of biphenyl can be discharged from the second exhaust pipe 132.

[0046] The implementation principle of a biphenyl furnace according to an embodiment of this application is as follows: First, the gas shut-off valve 114 is closed. The heat transfer oil is heated by the heat transfer oil and then enters the heat transfer oil circulation pipeline 16 to heat the biphenyl in the biphenyl furnace body 1. When the liquid biphenyl in the storage chamber 12 is heated to above 100 degrees Celsius and water vapor appears in the storage chamber 12, the first temperature sensor 123 controls the first gas control valve 122 to open and discharge the water vapor in the storage chamber 12. When the temperature in the storage chamber 12 gradually rises and the water vapor is discharged, the first temperature sensor 123 controls the first gas control valve 122 to close. Open the check valve 114 and start the rotary pump to transfer the biphenyl in the storage chamber 12 to the heating furnace 11. The liquid biphenyl is sprayed into the inner cavity of the heating furnace 11 through the spray device and heated and vaporized by the heating pipe 161. It then enters the spinning equipment through the outlet pipe 113. When the temperature in the biphenyl replenishment tank 14 gradually rises to a suitable temperature, the second temperature sensor 143 controls the flow control valve 142 to open. The liquid biphenyl in the biphenyl replenishment tank 14 enters the storage chamber 12 through the connecting pipe 141 to replenish the storage chamber 12. The heat transfer oil, after passing through the heating furnace 11, the biphenyl replenishment tank 14, and the storage chamber 12 in sequence, decreases in temperature and flows into the first condenser pipe 135 as condensate. Biphenyl vapor enters the condenser 13 from the spinning equipment and is condensed and liquefied by the first condenser 135. The second air valve is opened intermittently to discharge the uncondensed bad gas mixed in with the biphenyl vapor. The liquefied biphenyl enters the storage chamber 12 through the recovery pipe 136 and continues to enter the next heating cycle.

[0047] Example 2:

[0048] The difference between this embodiment and Embodiment 1 is that: (Refer to...) Figure 4 A first branch pipe 164 is installed between the heating pipe 161 and the insulation pipe 162. The insulation pipe 162 is connected to a second branch pipe 165 near the condenser pipe, which flows through the condenser pipe. The other end of the second branch pipe 165 is connected to the heat transfer oil heating device 15. Valves 166 are installed at the ends of the first branch pipe 164 near the insulation pipe 162 and the ends of the preheating pipe 163 near the first branch pipe 164. Valves 166 are also installed at the ends of the second branch pipe 165 near the preheating pipe 163 and the ends of the first condenser pipe 165 near the second branch pipe 165. A one-way valve is installed at the connection between the preheating pipe 163 and the insulation pipe 162. When biphenyl is not needed in the storage chamber 12, the valves 166 are controlled so that the heat transfer oil can directly enter the insulation pipe 162 from the heating pipe 161 through the first diversion pipe 164, and then return directly from the insulation pipe 162 to the heat transfer oil heating device 15, without heating the biphenyl in the biphenyl replenishment tank 14.

[0049] Reference Figure 4The condensing device 13 also includes a second condenser tube 138, which is staggered with the first condenser tube 135 within the condensing device 13. The second condenser tube 138 includes a condensate inlet end 1381 and a condensate outlet end 1382 installed on the outer wall of the condensing device 13. When the storage chamber 12 does not need to be replenished with biphenyl, the second condenser tube 138 is filled with condensate to achieve the condensing function of the condensing device 13. When it is necessary to improve the condensing efficiency, the second condenser tube 138 and the first condenser tube 135 can be used simultaneously.

[0050] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A bipyrilidin furnace, characterized in that: Includes a biphenyl furnace body (1), said biphenyl furnace body (1) includes A heating furnace (11) includes an outlet pipe (113) for discharging biphenyl vapors. A condenser (13) includes an inlet pipe (131) for discharging used biphenyl vapor. The liquid storage chamber (12) is used to store liquid biphenyl, and the liquid storage chamber (12) is connected to the condenser (13) and the heating furnace (11) respectively; A biphenyl replenishment tank (14) is used to store liquid biphenyl, and the biphenyl replenishment tank (14) is connected to the liquid storage chamber (12); The heat transfer oil circulation pipeline (16) is connected to the heat transfer oil heating device (15) at one end and to the heat transfer oil heating device (15) at the other end after passing through the heating furnace (11), biphenyl replenishment tank (14), liquid storage chamber (12) and condensation device (13). A first exhaust pipe (121) that is connected to the liquid storage chamber (12) and can be opened and closed. And a second exhaust pipe (132) that is connected to the condenser (13) and can be opened and closed. The heating furnace (11) is equipped with a spraying device, which includes a spraying pipe (111) vertically installed inside the heating furnace (11). The spraying pipe (111) is provided with multiple nozzles (112) at equal intervals along the vertical direction. The liquid storage chamber (12) is located outside the heating furnace (11). A first conduit (133) is provided between the heating furnace (11) and the liquid storage chamber (12). The liquid storage chamber (12) is equipped with a drive source for transferring liquid biphenyl to the spraying pipe (111). The heat transfer oil circulation pipeline (16) includes a preheating pipe (163) located inside the biphenyl replenishment tank (14) and connected to the heating pipe (161), an insulation pipe (162) located inside the liquid storage chamber (12) and connected to the preheating pipe (163), and a first condensing pipe (135) located inside the condensing device (13) and connected to the insulation pipe (162). The preheating pipe (163), the insulation pipe (162) and the condensing pipe are all bent into a corrugated shape. The condensation device (13) includes a recovery pipe (136), one end of which is away from the condensation device (13) is connected to the liquid storage chamber (12), and the second exhaust pipe (132) and the recovery pipe (136) are connected and communicate with each other; The first exhaust pipe (121) is provided with a first air control valve (122), and the second exhaust pipe (132) is provided with a second air control valve (137).

2. A diphenyl furnace as claimed in claim 1, characterized in that: The inner cavity of the heating furnace (11) is a cylindrical cavity. Multiple spray pipes (111) are arranged at equal intervals around the axis of the inner cavity of the heating furnace (11). The heat transfer oil circulation pipeline (16) includes heating pipes (161) located between the spray pipes (111). The heating pipes (161) are spiral tubes with vertical axes, and the spiral tubes formed by the heating pipes (161) gradually expand outward in the vertical direction.

3. A biphenyl furnace according to claim 1, characterized in that: A first temperature sensor is installed in the liquid storage chamber (12), and a second temperature sensor (143) is installed in the biphenyl replenishment tank (14).

4. A biphenyl furnace according to claim 1, characterized in that: A flow control valve (142) is provided between the biphenyl replenishment tank (14) and the liquid storage chamber (12) to control the liquid flow between the biphenyl replenishment tank (14) and the liquid storage chamber (12).

5. A biphenyl furnace according to claim 4, characterized in that: A first branch pipe (164) is connected between the heating pipe (161) and the insulation pipe (162); a second branch pipe (165) connected to the heat transfer oil heating device (15) is connected to the insulation pipe (162), and valves (166) are provided on both the first branch pipe (164) and the second branch pipe (165).

6. A biphenyl furnace according to claim 5, characterized in that: The condensing device (13) is also provided with a second condensing tube (138), which is arranged alternately with the first condensing tube (135). The second condensing tube (138) includes a condensate inlet end (1381) and a condensate outlet end (1382).

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