Phenolic resin reaction kettle with safety protection device

Abstract

The application relates to the technical field of chemical production, and relates to a phenolic resin reaction kettle with a safety protection device.The phenolic resin reaction kettle comprises a reaction kettle, cooling pipelines are spirally arranged in the peripheral wall of the reaction kettle, the inlet of the cooling pipeline is located at the bottom of the reaction kettle, the outlet of the cooling pipeline is located at the top of the reaction kettle, and a water inlet is further arranged at the top of the reaction kettle; a liquid cooling circulating mechanism comprises a liquid cooling pool arranged around the bottom of the reaction kettle and a high-level water tank arranged above the reaction kettle, a water pump for connecting the cooling pipeline is further arranged in the liquid cooling pool, the outlet pipe at the bottom of the high-level water tank is communicated with the side surface of the liquid cooling pool, the water inlet of the high-level water tank is communicated with the outlet of the cooling pipeline at the top of the reaction kettle, and the height of the side plate around the liquid cooling pool is greater than the height of the reaction kettle.The application realizes accurate control of the reaction temperature, ensures the safety and stability of the reaction process, and improves the emergency safety of the reaction kettle under the condition of power failure.

Description

Technical Field

[0001] This application relates to the field of chemical production technology, and in particular to a phenolic resin reactor with a safety protection device. Background Technology

[0002] Phenolic resin products mainly use phenol and formaldehyde as raw materials. During the production process, the raw materials react rapidly and release heat under the action of a catalyst. Therefore, indirect cooling water must be used to control the reaction temperature and reaction rate during production. However, if a power outage occurs during the reaction, the production conditions will change, the reaction temperature will become uncontrollable, and the temperature inside the reactor will rise rapidly. If measures are not taken immediately to control the temperature, the materials inside the reactor will react instantly, producing toxic gases that will continuously diffuse outside the reactor, leading to serious safety and environmental accidents.

[0003] Chinese patent CN213193640U discloses a phenolic resin reactor with a safety protection device, comprising: a reactor and a high-level water tank. The reactor has an inlet at its top, and the high-level water tank has an outlet at its lower part. The outlet and inlet are connected via a first pipe, on which a high-level water tank outlet valve is installed. This phenolic resin reactor has a reasonable safety protection device structure. By using a high-level water tank, the liquid level inside the reactor can be sealed with water in the event of a power outage, forcing rapid cooling and effectively preventing accidents.

[0004] In existing technology, water is released by opening the outlet valve at the bottom of the high-level water tank via a backup power source to create a water seal on the liquid surface of the material in the reactor, forcing it to cool rapidly. However, this process still requires a backup power source. Power outages are not frequent, and there is a risk of power loss from the backup power source, preventing the high-level water tank from releasing water. Furthermore, a malfunction in the outlet valve of the high-level water tank can also prevent water release, potentially leading to accidents. Therefore, a safer safety protection device for phenolic resin reactors is needed. Utility Model Content

[0005] In order to overcome the technical solutions existing in the prior art, this application provides a phenolic resin reaction vessel with a safety protection device.

[0006] The phenolic resin reactor with a safety protection device provided in this application adopts the following technical solution:

[0007] A phenolic resin reactor with a safety protection device includes a reactor with cooling pipes spirally distributed around its four sides. The inlet of the cooling pipes is located at the bottom of the reactor, and the outlet of the cooling pipes is located at the top of the reactor. A water inlet is also provided at the top of the reactor. A liquid cooling circulation mechanism includes a liquid cooling pool located around the bottom of the reactor and a high-level water tank above the reactor. A water pump connected to the cooling pipes is installed in the liquid cooling pool. The bottom outlet pipe of the high-level water tank is connected to the side of the liquid cooling pool, and the inlet of the high-level water tank is connected to the outlet of the cooling pipe at the top of the reactor. The height of the side plates around the liquid cooling pool is greater than the height of the reactor.

[0008] By adopting the above technical solution, the water pump pumps the coolant in the liquid cooling pool into the reactor through the cooling pipe inlet at the bottom of the reactor. The coolant spirals upward within the reactor's surrounding walls, absorbing the heat generated by the reaction. The heated coolant flows from the cooling pipe outlet at the top of the reactor into the high-level water tank. The coolant in the high-level water tank then flows back to the liquid cooling pool through the bottom outlet pipe, forming a circulating cooling system. At the same time, the height of the side plates of the liquid cooling pool is greater than the height of the reactor, and the bottom of the high-level water tank is higher than the reactor. When a power failure occurs, the cooling water in the high-level water tank will enter the liquid cooling pool through the outlet pipe under gravity, immersing the reactor in the liquid cooling pool. The cooling water enters the reactor through the inlet to water seal the materials, providing a safety protection function and ensuring the safe and stable operation of the reactor.

[0009] Preferably, the bottom of the elevated water tank is equipped with a first support frame, the bottom of the reactor is connected to the bottom surface of the liquid cooling pool through a second support frame, and the bottom surface of the elevated water tank is higher than the water inlet of the reactor.

[0010] By adopting the above technical solution, the high-level water tank and the reactor are fixed by support frames. The bottom of the high-level water tank is higher than the water inlet of the reactor, which can introduce all the cooling water in the high-level water tank into the liquid cooler to water seal the reactor in the event of a power outage.

[0011] Preferably, a compressor is installed at the bottom of the elevated water tank, the compressor is connected to a condenser on the side, and the condenser is connected to an evaporator located on the inner wall of the elevated water tank through an expansion tube.

[0012] Preferably, the evaporator is spirally distributed inside the high-level water tank, and the evaporator is completely submerged in the cooling water of the high-level water tank.

[0013] By adopting the above technical solution, the compressor at the bottom of the high-level water tank compresses the low-temperature, low-pressure refrigerant gas into a high-temperature, high-pressure gas. The high-temperature, high-pressure refrigerant gas then flows into the condenser on the side, where it dissipates heat to the external environment, condensing into a high-pressure liquid. When the high-pressure liquid passes through the expansion tube, its pressure drops sharply, becoming a low-temperature, low-pressure gas-liquid mixture. This mixture then enters the evaporator, which is spirally distributed on the inner wall of the high-level water tank and completely submerged in cooling water. Inside the evaporator, the low-temperature, low-pressure refrigerant absorbs heat from the coolant in the high-level water tank and evaporates into gas, thereby lowering the coolant temperature and achieving cooling of the coolant, ensuring the cooling effect of the circulating coolant.

[0014] Preferably, the inlet is connected to a pipe, which extends from the inlet into the liquid cooling pool, and the pipe opening is located below the reactor in the liquid cooling pool.

[0015] Preferably, an electrically controlled valve is provided at the water inlet, wherein the electrically controlled valve is in a closed state when energized and in an open state when de-energized.

[0016] By adopting the above technical solution, when the device is working normally, the electrically controlled valve remains closed to prevent coolant from leaking from the inlet. In the event of an abnormal power outage, the electrically controlled valve is de-energized, and the inlet opens immediately. An external pipe introduces external water into the liquid cooling tank, while coolant is simultaneously injected into the reactor from the pipe below to form a water seal. This quickly replenishes the coolant in the liquid cooling tank, preventing insufficient coolant from affecting the reactor's cooling effect. It also provides additional cooling protection for the reactor, serving as an emergency safeguard and ensuring effective cooling of the reactor even in the event of a sudden power outage.

[0017] Preferably, a liquid level sensor is installed on the side wall of the liquid cooling pool, and a temperature sensor is installed inside the reaction vessel.

[0018] Preferably, the level sensor, temperature sensor, compressor, and water pump are all connected to the PLC controller via signal connection.

[0019] By adopting the above technical solution, the liquid level sensor continuously monitors the coolant level in the liquid cooling pool, and the temperature sensor detects the temperature inside the reactor in real time, transmitting the data to the PLC controller in real time. The PLC controller analyzes the data and, when the reactor temperature rises, increases the speed of the water pump to enhance coolant circulation and cooling; if the temperature is too high, it further starts the compressor to lower the coolant temperature in the high-level water tank through the refrigeration system, enhancing the cooling effect. Simultaneously, when the liquid level sensor indicates that the liquid level in the liquid cooling pool is below the set value, the PLC controller issues an alarm, reduces the speed of the water pump, and increases the speed of the compressor to ensure sufficient coolant in the liquid cooling pool, achieving intelligent monitoring and precise control of the reactor temperature and the liquid level in the liquid cooling system.

[0020] In summary, this application includes at least one of the following beneficial technical effects:

[0021] 1. This application enhances the emergency response capability during power outages, abandoning the traditional method of relying on backup power to open valves. By forming a circulation system with the high-level water tank, liquid cooling pool, and reactor cooling pipes, the electrically controlled valves automatically open when power is lost. Utilizing the height difference between the high-level water tank and the reactor, and the structural design where the height of the liquid cooling pool is greater than that of the reactor, the cooling water in the high-level water tank can flow naturally into the reactor without electric drive, thus performing water seal cooling of the material liquid surface. This avoids accidents caused by the inability to cool down in time due to power loss from backup power or valve failure, greatly improving the emergency safety of the reactor in the event of a power outage.

[0022] 2. This application optimizes the cooling circulation efficiency. The cooling pipes spirally distributed inside the four walls of the reactor, combined with the liquid cooling circulation mechanism, form a high-efficiency cooling circulation system. The design of the cooling pipe inlet at the bottom of the reactor and the outlet at the top, coupled with the water pump drive, allows the cooling water to fully contact the reactor and uniformly remove the reaction heat. The design of connecting the high-level water tank and the liquid cooling pool realizes the recycling of cooling water, which not only improves the cooling efficiency, but also saves water resources and reduces production costs.

[0023] 3. This application achieves precise temperature control. The temperature sensor inside the reactor and the liquid level sensor on the side wall of the liquid cooling tank monitor the reaction temperature and the water level in the liquid cooling tank in real time, and feed the data back to the PLC controller. The PLC controller controls the operation of equipment such as compressor and water pump according to the preset program, thereby achieving precise control of the reaction temperature and ensuring the safety and stability of the reaction process.

[0024] 4. This application ensures the reliability of the system operation. The high-level water tank is installed through the first support frame, and the reactor is connected to the liquid cooling pool through the second support frame. The structure is stable and ensures that the position of each component is stable during operation. The bottom of the high-level water tank is higher than the water inlet of the reactor, ensuring that the cooling water can flow smoothly into the reactor. The evaporator is spirally distributed and completely submerged in the cooling water of the high-level water tank, which improves the cooling effect, further ensures the low temperature state of the cooling water, and improves the reliability of the entire safety protection device.

[0025] 5. This application enhances the level of safety early warning and protection. The liquid level sensor and temperature sensor monitor data in real time. Once the temperature inside the reactor rises abnormally or the water level in the liquid cooling pool is abnormal, the PLC controller can issue an alarm in time to remind the operator to take measures. At the same time, the automatic opening mechanism of the electrically controlled valve when the power is cut off and the natural flow cooling design of the cooling water constitute a multi-layer safety protection system, which effectively reduces the risk of safety production and environmental protection accidents caused by temperature runaway, and comprehensively improves the safety performance of the phenolic resin reactor. Attached Figure Description

[0026] Figure 1This is a schematic diagram of the overall structure of a phenolic resin reactor with safety protection devices.

[0027] Figure 2 This is a schematic diagram of the structure of a phenolic resin reactor with a hidden liquid cooling pool side frame and a safety protection device.

[0028] Figure 3 This is a top view of a phenolic resin reactor equipped with safety protection devices;

[0029] Figure 4 yes Figure 3 Sectional view of AA.

[0030] Explanation of reference numerals in the attached drawings: 1. Reactor; 11. Cooling pipe; 12. Water inlet; 121. Pipe; 122. Electrically controlled valve; 13. Second support frame; 14. Temperature sensor; 2. Liquid cooling circulation mechanism; 3. Liquid cooling pool; 31. Water pump; 32. Liquid level sensor; 4. High-level water tank; 41. Water outlet pipe; 42. First support frame; 43. Compressor; 44. Condenser; 45. Expansion pipe; 46. Evaporator; 5. PLC controller. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0032] This application discloses a phenolic resin reactor with a safety protection device.

[0033] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4A phenolic resin reactor 1 with a safety protection device includes a reactor 1, with cooling pipes 11 spirally distributed around the four sides of the reactor 1. The inlet of the cooling pipes 11 is located at the bottom of the reactor 1, and the outlet of the cooling pipes 11 is located at the top of the reactor 1. A water inlet 12 is also provided at the top of the reactor 1. A liquid cooling circulation mechanism 2 includes a liquid cooling pool 3 located around the bottom of the reactor 1 and a high-level water tank 4 above the reactor 1. A water pump 31 connected to the cooling pipes 11 is installed in the liquid cooling pool 3. The bottom outlet pipe 41 of the high-level water tank 4 is connected to the side of the liquid cooling pool 3. The water inlet 12 of the high-level water tank 4 is connected to the outlet of the cooling pipes 11 at the top of the reactor 1. The height of the side plates of the liquid cooling pool 3 is greater than the height of the reactor 1. Pump 31 pumps the coolant from the liquid cooling pool 3 into the reactor 1 through the inlet of the cooling pipe 11 at the bottom. The coolant spirals upward within the reactor 1, absorbing the heat generated by the reaction. The heated coolant flows from the outlet of the cooling pipe 11 at the top of the reactor 1 into the high-level water tank 4. The coolant in the high-level water tank 4 then flows back to the liquid cooling pool 3 through the bottom outlet pipe 41, forming a circulating cooling system. At the same time, the height of the side plates of the liquid cooling pool 3 is greater than the height of the reactor 1, and the bottom of the high-level water tank 4 is higher than the reactor 1. When a power failure occurs, the cooling water in the high-level water tank 4 will enter the liquid cooling pool 3 through the outlet pipe 41 under the action of gravity. The cooling water will immerse the reactor 1 in the liquid cooling pool 3. The cooling water enters the reactor 1 through the inlet 12 to water seal the material, which plays a safety protection role and ensures the safe and stable operation of the reactor 1.

[0034] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 The bottom of the elevated water tank 4 is equipped with a first support frame 42, and the bottom of the reactor 1 is connected to the bottom surface of the liquid cooling pool 3 via a second support frame 13. The bottom surface of the elevated water tank 4 is higher than the water inlet 12 of the reactor 1. The elevated water tank 4 and the reactor 1 are fixed by the support frames respectively. The bottom surface of the elevated water tank 4 is higher than the water inlet 12 of the reactor 1, which allows all the cooling water in the elevated water tank 4 to be diverted into the liquid cooling pool to water seal the reactor 1 in the event of a power outage.

[0035] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4A compressor 43 is installed at the bottom of the elevated water tank 4. The compressor 43 is connected to a condenser 44 on the side, and the condenser 44 is connected to an evaporator 46 located on the inner wall of the elevated water tank 4 via an expansion pipe 45. The evaporator 46 is spirally distributed inside the elevated water tank 4 and is completely submerged in the cooling water of the elevated water tank 4. The compressor 43 at the bottom of the elevated water tank 4 compresses the low-temperature, low-pressure refrigerant gas into a high-temperature, high-pressure gas. The high-temperature, high-pressure refrigerant gas then flows into the condenser 44 on the side, where it dissipates heat to the external environment, and the refrigerant gas condenses into a high-pressure liquid. When the high-pressure liquid passes through the expansion pipe 45, its pressure drops sharply, becoming a low-temperature, low-pressure gas-liquid mixture. It then enters the evaporator 46, which is spirally distributed on the inner wall of the elevated water tank 4 and completely submerged in the cooling water. Inside the evaporator 46, the low-temperature, low-pressure refrigerant absorbs heat from the coolant in the elevated water tank 4 and evaporates into gas, thereby lowering the temperature of the coolant and achieving cooling of the coolant, ensuring the cooling effect of the coolant circulation.

[0036] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 The inlet 12 is connected to a pipe 121, which extends from the inlet 12 into the liquid cooling pool 3. The outlet of pipe 121 is located below the reactor 1 inside the liquid cooling pool 3. An electrically controlled valve 122 is installed at the inlet 12. The valve 122 is closed when energized and open when de-energized. During normal operation, the valve 122 remains closed to prevent coolant leakage from the inlet 12. In the event of a power outage, the valve 122 is de-energized, opening the inlet 12. The external pipe 121 introduces external water into the liquid cooling pool 3, and simultaneously, coolant is injected into the reactor 1 from the outlet of pipe 121 below the reactor 1 to form a water seal. This quickly replenishes the coolant in the liquid cooling pool 3, preventing insufficient coolant from affecting the cooling effect of the reactor 1. It also provides additional cooling protection for the reactor 1, serving as an emergency safeguard and ensuring effective cooling of the reactor 1 even in the event of a sudden power outage.

[0037] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4A liquid level sensor 32 is installed on the side wall of the liquid cooling pool 3, and a temperature sensor 14 is installed inside the reactor 1. The liquid level sensor 32, temperature sensor 14, compressor 43, and water pump 31 are all connected to the PLC controller 5. The liquid level sensor 32 continuously monitors the liquid level of the coolant in the liquid cooling pool 3, and the temperature sensor 14 detects the temperature inside the reactor 1 in real time and transmits the data to the PLC controller 5 in real time. The PLC controller 5 analyzes the data. When the temperature of the reactor 1 rises, it increases the speed of the water pump 31 to enhance the cooling circulation. If the temperature is too high, it further starts the compressor 43 to reduce the temperature of the coolant in the high-level water tank 4 through the refrigeration system, thereby enhancing the cooling effect. At the same time, when the liquid level sensor 32 reports that the liquid level in the liquid cooling pool 3 is lower than the set value, the PLC controller 5 issues an alarm to reduce the speed of the water pump 31 and increase the speed of the compressor 43 to ensure sufficient coolant in the liquid cooling pool 3, thus realizing intelligent monitoring and precise control of the temperature of the reactor 1 and the liquid level of the liquid cooling system.

[0038] Working principle: When the safety protection device of the phenolic resin reactor 1 is powered on, the cooling water in the high-level water tank 4 is cooled and then enters the liquid cooling pool 3 under gravity through the bottom outlet pipe 41. The water pump 31 drives the cooling water in the liquid cooling pool 3 to circulate and dissipate heat through the cooling pipe 11 of the reactor 1 before returning to the high-level water tank 4 for cooling. The temperature sensor 14 and the liquid level sensor 32 work together with the PLC controller 5 to precisely regulate the temperature, and the electric control valve 122 remains closed. When the power is off, the electric control valve 122 automatically opens, and the cooling water in the high-level water tank 4 enters the liquid cooling pool 3 by gravity. At the same time, it enters the reactor 1 through the pipe 121 for water seal cooling, continuously ensuring the safety of the reactor 1.

[0039] 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 phenolic resin reactor (1) with a safety protection device, characterized in that: include The reactor (1) has cooling pipes (11) spirally distributed inside its four walls. The inlet of the cooling pipes (11) is located at the bottom of the reactor (1), and the outlet of the cooling pipes (11) is located at the top of the reactor (1). A water inlet (12) is also provided at the top of the reactor (1). The liquid cooling circulation mechanism (2) includes a liquid cooling pool (3) located around the bottom of the reactor (1) and a high-level water tank (4) above the reactor (1). The liquid cooling pool (3) is also equipped with a water pump (31) connected to the cooling pipe (11). The bottom outlet pipe (41) of the high-level water tank (4) is connected to the side of the liquid cooling pool (3). The inlet (12) of the high-level water tank (4) is connected to the outlet of the cooling pipe (11) at the top of the reactor (1). The height of the side plates around the liquid cooling pool (3) is greater than the height of the reactor (1).

2. The phenolic resin reactor (1) with a safety protection device according to claim 1, characterized in that: The bottom of the high-level water tank (4) is equipped with a first support frame (42), and the bottom of the reactor (1) is connected to the bottom surface of the liquid cooling pool (3) through a second support frame (13). The bottom surface of the high-level water tank (4) is higher than the water inlet (12) of the reactor (1).

3. The phenolic resin reactor (1) with a safety protection device according to claim 1, characterized in that: The high-level water tank (4) is equipped with a compressor (43) at the bottom. The compressor (43) is connected to the condenser (44) on the side. The condenser (44) is connected to the evaporator (46) located on the inner wall of the high-level water tank (4) through an expansion pipe (45).

4. The phenolic resin reactor (1) with a safety protection device according to claim 3, characterized in that: The evaporator (46) is spirally distributed inside the high-level water tank (4), and the evaporator (46) is completely submerged in the cooling water of the high-level water tank (4).

5. The phenolic resin reactor (1) with a safety protection device according to claim 1, characterized in that: The inlet (12) is connected to a pipe (121), which extends from the inlet (12) into the liquid cooling pool (3). The opening of the pipe (121) is located below the reactor (1) inside the liquid cooling pool (3).

6. The phenolic resin reactor (1) with a safety protection device according to claim 5, characterized in that: An electrically controlled valve (122) is provided at the water inlet (12), wherein the electrically controlled valve (122) is closed when energized and open when de-energized.

7. A phenolic resin reactor (1) with a safety protection device according to claim 1, characterized in that: A liquid level sensor (32) is provided on the side wall of the liquid cooling pool (3), and a temperature sensor (14) is provided inside the reactor (1).

8. A phenolic resin reactor (1) with a safety protection device according to claim 7, characterized in that: The liquid level sensor (32), temperature sensor (14), compressor (43) and water pump (31) are all connected to the PLC controller (5) via signal.

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