Resin reaction kettle heat supply system and heat supply control method thereof

Abstract

The invention provides a resin reaction kettle heat supply system and a heat supply control method thereof.The resin reaction kettle heat supply system comprises an oil heating system and a steam heating system, the oil heating system further comprises a backflow air duct, a mixed air duct, an air blower, an air preheater and a heat exchanger, and the air preheater and the heat exchanger are arranged in a flue of a heating boiler; the air blower is arranged on the mixed air duct and divides the mixed air duct into an air inlet section and an air outlet section, the two ends of the backflow air duct are communicated between the air inlet section and the flue, a communication port between the backflow air duct and the flue is located between the air preheater and the heat exchanger, and the air preheater is communicated between an air outlet of the air outlet section and an air inlet of the combustor. The water medium in the heat exchanger is supplied to the steam heating system, air fed to the air preheater for heating can be pre-preheated, the temperature and combustion temperature of the air fed into the combustor are increased, the combustion rate of the combustor is increased, smoke heat can be recycled more thoroughly and efficiently, and the purposes of saving energy and reducing consumption are achieved.

Description

Technical Field

[0001] This invention relates to the field of heating systems for resin reactors, and in particular to a heating system for a resin reactor and a heating control method for the same system. Background Technology

[0002] Resin reactors are key equipment used in chemical production for the synthesis of resins. They are widely used in the manufacturing processes of unsaturated polyester resins, epoxy resins, phenolic resins, alkyd resins, ABS resins, coatings, adhesives, and other products. Their core function is to promote the polymerization or other chemical reactions of raw materials under controlled temperature, pressure, and stirring conditions to generate the target resin product.

[0003] To meet the different reaction temperature requirements of the resin reactor, the existing resin reactor heating system is equipped with an oil heating system and a steam heating system. The oil heating system heats the heat transfer oil to a high temperature and supplies it to the first coil of the resin reactor for circulation, enabling the resin reactor to meet the reaction temperature requirements above 100°C. The steam heating system heats water to generate steam and supplies it to the second coil of the resin reactor for circulation, enabling the resin reactor to meet the reaction temperature requirements below 100°C.

[0004] The existing oil heating system of the resin reactor heating system heats the heat transfer oil circulating in the boiler by using the high-temperature flue gas generated by fuel combustion. After the temperature of the heat transfer oil is raised, it is supplied to the first coil of the resin reactor through the oil outlet pipe of the heating boiler to provide the required reaction heat for the resin reactor. The flue gas generated after fuel combustion is discharged through the flue of the heating boiler, and the temperature is generally around 230°C, and sometimes even as high as 300°C.

[0005] In order to recover and utilize the heat of flue gas, the oil heating system of the existing resin reactor heating system is equipped with an air preheater in the flue. The flue gas discharged from the flue passes through the air preheater, so that the heat of the flue gas is transferred to the air preheater. Then, the external cold air is sent to the air preheater by the blower to preheat the air before it enters the burner to a certain temperature. The preheated hot air is sent into the burner to play a role in combustion.

[0006] However, the blower of the oil heating system in the existing resin reactor heating system sends external cold air to the air preheater for heating to generate hot air. Since the heating surface between the air preheater and the flue gas is stable, the heat release surface of the air preheater for heating the cold air is also stable. As a result, the temperature of the hot air generated by heating the cold air is not high. The low temperature hot air sent into the burner is not enough to achieve a good combustion effect, which in turn affects the combustion rate of the burner and further affects the heating efficiency of the oil heating system.

[0007] In addition, the existing oil heating system of the resin reactor heating system generally only adds an air preheater in the flue of the heating boiler to recover the waste heat of the flue gas. This results in the incomplete and inefficient recovery and utilization of flue gas heat, which leads to the waste of some flue gas heat and causes thermal pollution to the environment, and does not meet the requirements of energy conservation and environmental protection. Summary of the Invention

[0008] To achieve the first objective of this invention, the present invention provides a resin reactor heating system that can accurately and stably meet the different reaction temperature requirements of the resin reactor, making the heating safe and efficient. It can also preheat the air sent to the air preheater to further increase the air temperature sent to the burner, thereby further increasing the combustion temperature of the burner and providing better combustion assistance, thus improving the combustion rate of the burner and improving the heating efficiency. Furthermore, it can more thoroughly and efficiently recover and utilize the heat from the flue gas, achieving the purpose of energy saving and consumption reduction, and meeting the requirements of energy conservation and environmental protection.

[0009] To achieve the second objective of this invention, this invention provides a heating control method for the above-mentioned resin reactor heating system.

[0010] To achieve the first objective of this invention, a resin reactor heating system is provided, comprising an oil heating system and a steam heating system. The oil heating system includes a burner, a boiler, a gas-liquid separator, an expansion tank, and a circulating pump. The burner is connected to the furnace of the boiler, and the oil outlet pipe of the boiler is connected to the oil inlet of the resin reactor. The suction pipe of the gas-liquid separator is connected to the oil outlet of the resin reactor, and the exhaust pipe of the gas-liquid separator is connected to the bottom port of the expansion tank. The two ports of the circulating pump are respectively connected to the liquid outlet pipe of the gas-liquid separator and the oil return pipe of the boiler. The steam outlet pipe of the steam heating system is connected to the steam inlet of the resin reactor, and the return pipe of the steam heating system is connected to the discharge port of the resin reactor. The expansion tank is located within the resin reactor. The highest point of the heating system is horizontally offset from the heating boiler, and the top of the expansion tank is connected to an exhaust pipe. The oil heating system also includes a return air duct, a mixing air duct, a blower, an air preheater, and a heat exchanger. The air preheater and the heat exchanger are respectively installed in the flue of the heating boiler, with the air preheater located below the heat exchanger. The blower is installed on the mixing air duct and divides the mixing air duct into an air inlet section and an air outlet section. The air inlet of the air inlet section draws in external cold air. The two ends of the return air duct are connected between the air inlet section and the flue, and the connection between the return air duct and the flue is located between the air preheater and the heat exchanger. The air preheater is connected between the air outlet of the air outlet section and the air inlet of the burner. The water medium in the heat exchanger supplies the steam heating system.

[0011] As can be seen from the above scheme, when the resin reactor heating system of the present invention supplies steam to the resin reactor to meet the requirement of the resin reactor to achieve a reaction temperature below 100°C, the oil heating system stops supplying heat transfer oil to the resin reactor, thereby the steam heating system is turned on and supplies steam to the resin reactor.

[0012] When the resin reactor heating system of this invention supplies heat transfer oil to the resin reactor to meet the reaction temperature requirement of the resin reactor above 100°C, the steam heating system stops supplying steam to the resin reactor, and the oil heating system starts and supplies heat transfer oil to the resin reactor. Specifically, the circulation pump of the oil heating system of this invention starts running. Under the action of the circulation pump, a heat transfer oil circulation loop is formed between the heating boiler, the resin reactor, the gas-liquid separator, and the circulation pump. The burner mixes fuel and air in proportion and injects it into the furnace of the heating boiler for combustion to heat the heat transfer oil returning to the heating boiler. The heated heat transfer oil is then supplied to the resin reactor from the oil outlet pipe of the heating boiler. To meet the reaction temperature requirements of the resin reactor, the heat transfer oil, after heat exchange in the reactor, is discharged from the oil outlet into the suction pipe and sent to the gas-liquid separator. The gas-liquid separator separates the air, water vapor, and other gases mixed in the heat transfer oil, ensuring stable operation with a gas-free and water-free liquid phase. The separated pure liquid phase heat transfer oil is then returned to the heating boiler via the drain pipe, circulating pump, and return oil pipe. The returned heat transfer oil is heated by the burner and then recirculated to the resin reactor, ensuring a precise and stable supply of heat transfer oil to the reactor according to its reaction temperature requirements. Simultaneously, the separated air, water vapor, and other gases are sent to the expansion tank through the gas-liquid separator's exhaust pipe and discharged from the top outlet pipe of the expansion tank, further ensuring stable operation with a gas-free and water-free liquid phase.

[0013] Because the expansion tank of this invention is located at the highest point of the resin reactor heating system and is horizontally offset from the heating boiler, it can prevent the heat from the heating boiler from causing the heat transfer oil in the expansion tank to vaporize, thereby avoiding the loss of heat transfer oil and ensuring the stability of the amount of heat transfer oil circulating in the system.

[0014] During the combustion process where the burner mixes fuel and air in a specific ratio and injects the mixture into the furnace of the heating boiler, the flue gas produced after fuel combustion is discharged through the boiler's flue. The oil heating system of this invention also includes a return air duct, a mixing air duct, a blower, an air preheater, and a heat exchanger. The air preheater and heat exchanger are respectively located within the boiler's flue, with the air preheater positioned below the heat exchanger. The blower is located on the mixing air duct, dividing it into an inlet section and an outlet section. The inlet of the inlet section draws in external cold air. The two ends of the return air duct connect the inlet section and the flue, with the connection point between the return air duct and the flue located between the air preheater and the heat exchanger. The air preheater connects the outlet of the outlet section to the inlet of the burner. The water medium in the heat exchanger supplies the steam heating system. Thus, after the high-temperature flue gas enters the flue, it first passes through the air preheater. The high-temperature flue gas transfers some heat to the air preheater, forming medium-temperature flue gas. Under the action of the blower... In the flue gas duct, a portion of the medium-temperature flue gas located between the air preheater and the heat exchanger is sent to the inlet section of the mixing duct through the return air duct. Simultaneously, external cold air is drawn in through the inlet of the mixing duct's inlet section, causing the cold air and medium-temperature flue gas in the mixing duct's inlet section to mix and form preheated air. Under the continuous action of the blower, the preheated air is sent from the inlet section of the mixing duct to the outlet section of the mixing duct, and then undergoes heat exchange in the air preheater to form high-temperature air. The high-temperature air is sent to the burner to increase the burner's combustion temperature. Since the return air duct sends a portion of the medium-temperature flue gas to the inlet section of the mixing duct to mix with the cold air entering the mixing duct's inlet section to form preheated air, the air sent to the air preheater for heating is preheated, further increasing the air temperature sent to the burner and further increasing the burner's combustion temperature. This provides better combustion assistance to the burner, thereby increasing the burner's combustion rate and ultimately improving the heating efficiency. Furthermore, another portion of the medium-temperature flue gas located between the air preheater and the heat exchanger in the flue passes through the heat exchanger above. This portion of medium-temperature flue gas transfers heat to the heat exchanger, forming low-temperature flue gas. This low-temperature flue gas, meeting energy-saving and environmental protection requirements, can be discharged from the flue's exhaust port. The heat exchanger, which obtains heat from the medium-temperature flue gas, can heat the water medium inside and supply the heated water medium to the steam heating system for storage and backup. This reduces the energy consumption of the steam heating system and improves its heating efficiency. Moreover, the oil heating system of this invention, by incorporating a return air duct, a mixing air duct, a blower, an air preheater, and a heat exchanger, can more thoroughly and efficiently recover and utilize the heat from the flue gas, achieving the goal of energy saving and consumption reduction.

[0015] Therefore, the resin reactor heating system of this invention can accurately and stably meet the different reaction temperature requirements of the resin reactor, thereby accurately and stably supplying steam or heat transfer oil to the resin reactor according to the reaction temperature requirements, making the heating safe and efficient. Furthermore, the resin reactor heating system of this invention can send a portion of the medium-temperature flue gas to the inlet section of the mixing duct through the return air duct, mixing it with the cold air entering the mixing duct to form preheated air. This preheats the air sent to the air preheater, further increasing the air temperature sent to the burner, and further increasing the combustion temperature of the burner, providing better combustion assistance and thus increasing the combustion rate and heating efficiency. Moreover, the oil heating system of the resin reactor heating system of this invention, by setting up the return air duct, mixing duct, blower, air preheater, and heat exchanger, can more thoroughly and efficiently recover and utilize the heat from the flue gas, achieving energy saving and consumption reduction, and meeting energy conservation and environmental protection requirements.

[0016] A further embodiment is that a vent pipe is connected between the suction pipe and the expansion tank, and the vent pipe is equipped with a first shut-off valve; and / or, the exhaust pipe is equipped with a second shut-off valve; and / or, the exhaust pipe includes a connected vertical pipe section and an inclined pipe section, with the inclined pipe section located above the vertical pipe section; when the length of the vertical pipe section is greater than 1 meter, the angle of inclination between the inclined pipe section and the horizontal direction is between 5° and 25°; when the length of the vertical pipe section is less than or equal to 1 meter, the angle of inclination between the inclined pipe section and the horizontal direction is between 30° and 60°.

[0017] A further embodiment is that the fuel inlet of the burner is connected to the gas supply pipe, which is filled with natural gas. The gas supply pipe is arranged in sequence with a third shut-off valve, a first filter, a pressure regulating valve, and a first pressure sensor facing the fuel inlet. A vent pipe is connected between the first pressure sensor and the pressure regulating valve. The exhaust port of the vent pipe is connected to the outside, and a ball valve is installed on the vent pipe.

[0018] A further option is that the oil heating system also includes an oil storage tank, which is located at the lowest point of the resin reactor heating system. The top of the oil storage tank is provided with a vent, and a drain pipe is connected between the oil storage tank and the oil outlet pipe. An overflow pipe is connected between the overflow port of the expansion tank and the drain pipe, and a safety valve is installed in the pipeline between the overflow pipe and the oil outlet pipe.

[0019] A further embodiment is that the oil outlet pipe between the drain pipe and the resin reactor is connected to the suction pipe via a bypass pipe, the bypass pipe is equipped with a regulating valve, and the first section of the oil outlet pipe between the heating boiler and the drain pipe is equipped with a second pressure sensor and a first temperature sensor, the second section of the oil outlet pipe between the drain pipe and the bypass pipe is equipped with a flow sensor and a fourth shut-off valve, and the third section of the oil outlet pipe between the bypass pipe and the resin reactor is equipped with a fifth shut-off valve; and / or, the oil outlet at the bottom of the expansion tank is connected to the overflow pipe via a discharge pipe, the discharge pipe being equipped with a sixth shut-off valve.

[0020] A further embodiment of the oil heating system includes an oil inlet pipe, an inlet / outlet pump, an oil injection pipe, an oil drain pipe, and a discharge pipe. The inlet / outlet pump is connected between the oil inlet pipe and the oil injection pipe. The oil inlet pipe is used to connect to the heat transfer oil. The oil injection port of the oil injection pipe is connected to the expansion tank. A refueling pipe is connected between the oil injection pipe and the oil storage tank. The refueling pipe is equipped with a seventh shut-off valve. The oil inlet pipe is equipped with an eighth shut-off valve and a second filter. The second filter is connected adjacent to the outlet pump. One end of the discharge pipe is connected to the pipeline between the eighth shut-off valve and the second filter of the oil inlet pipe, and the other end of the discharge pipe is connected to the oil outlet at the bottom of the oil storage tank through a first branch pipe. The first branch pipe is equipped with a ninth shut-off valve. The discharge pipe is connected to the oil injection pipe for discharging the heat transfer oil, and the discharge pipe is equipped with a tenth shut-off valve.

[0021] A further proposed solution involves two circulating pumps, with two flow pipes connected in parallel between the drain pipe and the return oil pipe. One circulating pump is installed on one flow pipe. Each flow pipe has an eleventh shut-off valve, a third filter, and a first expansion joint in the first pipe between the circulating pump and the drain pipe. Each flow pipe also has a second expansion joint and a twelfth shut-off valve in the second pipe between the circulating pump and the return oil pipe. The first and second expansion joints are respectively located adjacent to the two pump ports of the circulating pump.

[0022] A further option is to install a thirteenth shut-off valve, a third pressure sensor, and a second temperature sensor on the return oil pipe; and / or, to install a fourth pressure sensor on the drain pipe; and / or, when the distance between the circulating pump and the heating boiler is greater than 5 meters, to install a fifth pressure sensor on the second pipe corresponding to the circulating pump.

[0023] A further proposed solution is that the other end of the drain pipe is connected to a first pipeline via a second branch pipe, the second branch pipe being equipped with a fourteenth shut-off valve, and the other end of the drain pipe is connected to another first pipeline via a third branch pipe, the third branch pipe being equipped with a fifteenth shut-off valve.

[0024] To achieve the second objective of this invention, this invention provides a heating control method for a resin reactor heating system. The resin reactor heating system is the aforementioned resin reactor heating system. The heating control method includes: internal circulation operation, stable heating operation, abnormal fault operation, and oil shortage injection operation. When the heating boiler is turned on for a preset time or when the resin reactor does not require heat transfer oil, the heating control method performs internal circulation operation. The internal circulation operation includes: controlling the fourth shut-off valve and the regulating valve to open, turning on the circulation pump, and closing the fifth shut-off valve, so that an internal circulation loop of heat transfer oil is formed between the heating boiler, the oil outlet pipe, the bypass pipe, the suction pipe, the gas-liquid separator, the drain pipe, the circulation pump, and the return oil pipe. When supplying heat transfer oil to the resin reactor, the heating control method performs a stable heating operation. The stable heating operation includes: controlling the fourth shut-off valve, the regulating valve, and the fifth shut-off valve to open, and starting the circulation pump to form a heat transfer oil heating circulation loop between the heating boiler, the oil outlet pipe, the resin reactor, the suction pipe, the gas-liquid separator, the drain pipe, the circulation pump, and the return oil pipe, and connecting the oil outlet pipe and the suction pipe with the bypass pipe, and adjusting the valve opening according to the oil consumption of the resin reactor. When the heating boiler experiences an emergency shutdown, the heating control method executes an abnormal fault operation, which includes: controlling the sixth shut-off valve to open, so that the bottom oil outlet of the expansion tank is connected to the overflow pipe through the discharge pipe. Then, the cooling heat transfer oil in the expansion tank uses its potential energy to force the safety valve to open so that it can enter the furnace tube of the heating boiler through the discharge pipe and the oil outlet pipe, thereby preventing the heat transfer oil in the furnace tube from overheating. When the real-time liquid level of the heat transfer oil in the expansion tank is lower than the minimum liquid level threshold, the heating control method performs an oil shortage injection operation. The oil shortage injection operation includes: controlling the eighth shut-off valve to open, starting the inlet and outlet pumps, and controlling the ninth and tenth shut-off valves to close, so as to replenish the expansion tank with external heat transfer oil through the inlet pipe and the injection pipe. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the first structure of an embodiment of the resin reactor heating system of the present invention.

[0026] Figure 2 This is a second structural schematic diagram of an embodiment of the resin reactor heating system of the present invention.

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0028] Various exemplary embodiments of the invention will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are in no way intended to limit the invention or its application or use. The invention can be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the invention thorough and complete, and to fully express the scope of the invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0029] The terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Words such as "including" or "comprising" mean that the element preceding the word encompasses the element listed after it, without excluding the possibility of encompassing other elements. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0030] In this invention, when a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediary device, or it may not be directly connected to the other devices but may have an intermediary device.

[0031] All terms used in this invention (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having the meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined herein.

[0032] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0033] Example of a resin reactor heating system: See Figures 1 to 2 This embodiment discloses a resin reactor heating system, including an oil heating system and a steam heating system 39.

[0034] In this embodiment, the oil heating system includes a burner 65, a heating boiler 31, a gas-liquid separator 19, an expansion tank 13, and a circulating pump 30. The burner 65 is connected to the furnace of the heating boiler 31. The oil outlet pipe 32 of the heating boiler 31 is connected to the oil inlet of the resin reactor 38. The suction pipe 18 of the gas-liquid separator 19 is connected to the oil outlet of the resin reactor 38, and the exhaust pipe 20 of the gas-liquid separator 19 is connected to the bottom port of the expansion tank 13. The two ports of the circulating pump 30 are respectively connected to the liquid discharge pipe 24 of the gas-liquid separator 19 and the oil return pipe 26 of the heating boiler 31. The steam outlet pipe of the steam heating system 39 is connected to the steam inlet of the resin reactor 38, and the return pipe of the steam heating system 39 is connected to the discharge port of the resin reactor 38.

[0035] Furthermore, in this embodiment, the expansion tank 13 is located at the highest position of the resin reactor heating system and is horizontally offset from the heating boiler 31, and the top of the expansion tank 13 is connected to the gas outlet pipe 14.

[0036] Furthermore, the oil heating system in this embodiment also includes a return air duct 77, a mixing air duct 75, a blower 76, an air preheater 74, and a heat exchanger 78. The air preheater 74 and the heat exchanger 78 are respectively installed in the flue 73 of the heating boiler 31, with the air preheater 74 located below the heat exchanger 78. The blower 76 is installed on the mixing air duct 75 and divides the mixing air duct 75 into an air inlet section 751 and an air outlet section 752. The air inlet of the air inlet section 751 draws in external cold air. The two ends of the return air duct 77 are connected between the air inlet section 751 and the flue 73, and the connection between the return air duct 77 and the flue 73 is located between the air preheater 74 and the heat exchanger 78. The air preheater 74 is connected between the air outlet of the air outlet section 752 and the air inlet of the burner 65. The water medium in the heat exchanger 78 is supplied to the steam heating system 39.

[0037] When the resin reactor heating system of this embodiment supplies steam to the resin reactor 38 to meet the reaction temperature requirement of the resin reactor 38 below 100°C, the oil heating system stops supplying heat transfer oil to the resin reactor 38, and the steam heating system 39 is turned on and supplies steam to the resin reactor 38. Specifically, the steam heating system 39 is a heating device that uses the thermal energy of fuel or other energy sources to heat water into steam. The working principle is to convert energy into thermal energy through heating elements (such as electric heating tubes or combustion chambers), transfer it to water, make it reach the boiling point and vaporize it, thereby continuously producing steam, and stably and continuously supplying steam to the resin reactor 38, so as to accurately and stably supply steam to the resin reactor 38 according to the reaction temperature requirement of the resin reactor 38.

[0038] When the resin reactor heating system of this embodiment supplies heat transfer oil to the resin reactor 38 to meet the requirement of achieving a reaction temperature above 100°C, the steam heating system 39 stops supplying steam to the resin reactor 38, and the oil heating system starts and supplies heat transfer oil to the resin reactor 38. Specifically, the circulation pump 30 of the oil heating system of this embodiment starts running. Under the action of the circulation pump 30, a heat transfer oil circulation loop is formed between the heating boiler 31, the resin reactor 38, the gas-liquid separator 19, and the circulation pump 30. The burner 65 mixes fuel and air in proportion and injects it into the furnace of the heating boiler 31 for combustion to heat the heat transfer oil returning to the heating boiler 31. The heated heat transfer oil is then supplied to the resin reactor 38 from the oil outlet pipe 32 of the heating boiler 31. To meet the reaction temperature requirements of the resin reactor 38, the heat transfer oil after heat exchange in the resin reactor 38 is discharged from the oil outlet of the resin reactor 38 into the suction pipe 18, and then sent to the gas-liquid separator 19. The gas-liquid separator 19 performs gas-liquid separation treatment on the heat transfer oil to separate the air, water vapor and other gases mixed in the heat transfer oil, thereby ensuring stable operation of the heat transfer oil in a gas-free and water-free state. The gas-liquid separator 19 then returns the separated pure liquid phase heat transfer oil to the heating boiler 31 through the drain pipe 24 and through the circulation pump 30 and the return oil pipe 26. The heat transfer oil returning to the heating boiler 31 is heated by the burner 65 and then circulated to the resin reactor 38 to accurately and stably supply heat transfer oil to the resin reactor 38 according to the reaction temperature requirements of the resin reactor 38. Meanwhile, the gas-liquid separator 19 sends the separated air, water vapor and other gases into the expansion tank 13 through the exhaust pipe 20 of the gas-liquid separator 19, and can discharge them from the top gas outlet pipe 14 of the expansion tank 13, thereby ensuring stable operation of the heat transfer oil in a state of no gas or water in the liquid phase.

[0039] Since the expansion tank 13 in this embodiment is located at the highest position of the resin reactor heating system and is horizontally offset from the heating boiler 31, the heat from the heating boiler 31 can prevent the heat transfer oil in the expansion tank 13 from vaporizing, thereby avoiding the loss of heat transfer oil and ensuring the stability of the amount of heat transfer oil circulating in the system.

[0040] During the combustion process where the burner 65 mixes fuel and air in a specific ratio and injects the mixture into the furnace of the heating boiler 31, the flue gas generated after fuel combustion is discharged through the flue 73 of the heating boiler 31. In this embodiment, the oil heating system also includes a return air duct 77, a mixing air duct 75, a blower 76, an air preheater 74, and a heat exchanger 78. The air preheater 74 and the heat exchanger 78 are respectively installed in the flue 73 of the heating boiler 31, with the air preheater 74 located below the heat exchanger 78. The blower 76 is installed on the mixing air duct 75 and divides the mixing air duct 75 into an air inlet section 751 and... External cold air is drawn in through the air inlet of the air outlet section 752 and the air inlet section 751. The two ends of the return air duct 77 connect the air inlet section 751 and the flue 73. The connection between the return air duct 77 and the flue 73 is located between the air preheater 74 and the heat exchanger 78. The air preheater 74 connects the air outlet of the air outlet section 752 and the air inlet of the burner 65. The water medium in the heat exchanger 78 supplies the steam heating system 39. Thus, after the high-temperature flue gas enters the flue 73, it first passes through the air preheater 74. The high-temperature flue gas transfers some of its heat to the air preheater 74, forming medium-temperature flue gas. Under the action of blower 76, a portion of the medium-temperature flue gas located between air preheater 74 and heat exchanger 78 in flue 73 is sent to the inlet section 751 of mixing duct 75 through return air duct 77. Simultaneously, external cold air is drawn in through the inlet of the inlet section 751 of mixing duct 75, causing the cold air and medium-temperature flue gas in the inlet section 751 of mixing duct 75 to mix and form preheated air. Under the continuous action of blower 76, the preheated air is sent from the inlet section 751 of mixing duct 75 to the outlet section 752 of mixing duct 75, and undergoes heat exchange through air preheater 74 to form high-temperature flue gas. Warm air, high-temperature air is sent into burner 65 to increase the combustion temperature of burner 65. Since the return air duct 77 sends part of the medium-temperature flue gas to the air inlet section 751 of the mixing air duct 75 to mix with the cold air entering the air inlet section 751 of the mixing air duct 75 to form preheated air, thereby preheating the air sent to the air preheater 74 for heating, further increasing the air temperature sent into burner 65, and further increasing the combustion temperature of burner 65, providing better combustion assistance to burner 65, thereby increasing the combustion rate of burner 65, and thus improving heating efficiency. Furthermore, another portion of the medium-temperature flue gas located between the air preheater 74 and the heat exchanger 78 in the flue 73 passes through the heat exchanger 78 above. This portion of medium-temperature flue gas transfers heat to the heat exchanger 78 to form low-temperature flue gas. The low-temperature flue gas that meets the requirements of energy conservation and environmental protection can be discharged from the exhaust port of the flue 73. The heat exchanger 78, which obtains heat from the medium-temperature flue gas, can heat the water medium inside it and supply the heated water medium to the steam heating system 39 for storage and backup. This can reduce the energy consumption of the steam heating system 39 and improve the heating efficiency of the steam heating system 39.Moreover, the oil heating system in this embodiment, by setting up a return air duct 77, a mixing air duct 75, a blower 76, an air preheater 74, and a heat exchanger 78, can more thoroughly and efficiently recover and utilize the heat of flue gas, thereby achieving the purpose of energy saving and consumption reduction.

[0041] Therefore, the resin reactor heating system of this embodiment can accurately and stably meet the different reaction temperature requirements of the resin reactor 38, thereby accurately and stably supplying steam or heat transfer oil to the resin reactor 38 according to its reaction temperature requirements, making the heating safe and efficient. Furthermore, the resin reactor heating system of this embodiment can send a portion of the medium-temperature flue gas to the air inlet section 751 of the mixing duct 75 through the return air duct 77 to mix with the cold air entering the air inlet section 751 of the mixing duct 75 to form preheated air. This preheats the air sent to the air preheater 74 for heating, further increasing the air temperature sent to the burner 65, and further increasing the combustion temperature of the burner 65, providing better combustion assistance to the burner 65, thereby increasing the combustion rate of the burner 65 and ultimately improving the heating efficiency. Furthermore, the oil heating system of the resin reactor heating system in this embodiment, by setting up a return air duct 77, a mixing air duct 75, a blower 76, an air preheater 74, and a heat exchanger 78, can more thoroughly and efficiently recover and utilize the heat of the flue gas, achieving the purpose of energy saving and consumption reduction, and meeting the requirements of energy conservation and environmental protection.

[0042] To monitor the flue gas temperature in the flue 73 in real time to ensure compliance with energy conservation and environmental protection requirements, the flue 73 in this embodiment is equipped with a first thermometer 79, a second thermometer 80, and a third thermometer 81. The first thermometer 79 is located below the air preheater 74 to detect the temperature of the high-temperature flue gas just entering the flue 73 in real time. The second thermometer 80 is located between the air preheater 74 and the heat exchanger 78 to detect the temperature of the medium-temperature flue gas after heat exchange in the air preheater 74 in real time. The third thermometer 81 is located above the heat exchanger 78 to detect the temperature of the low-temperature flue gas after heat exchange in the heat exchanger 78 in real time, so as to ensure that the temperature of the low-temperature flue gas discharged from the exhaust port 731 of the flue 73 meets environmental protection requirements.

[0043] To improve the circulation pressure stability of the heat transfer oil in the oil heating system, a vent pipe 16 is connected between the suction pipe 18 and the expansion tank 13. The vent pipe 16 is equipped with a first shut-off valve 17, which controls the opening of the first shut-off valve 17 so that the vent pipe 16 connects the suction pipe 18 and the expansion tank 13. The heat transfer oil discharged from the oil outlet of the resin reactor 38 into the suction pipe 18 is discharged. Since the heat transfer oil in the suction pipe 18 is mixed with gas, most of the gas mixed in the heat transfer oil in the suction pipe 18 will rise through the vent pipe 16 and be directly sent into the expansion tank 13, and can be discharged from the top vent pipe 14 of the expansion tank 13. This reduces the amount of gas mixed in the heat transfer oil sent from the suction pipe 18 to the gas-liquid separator 19, thereby reducing the workload of the gas-liquid separator 19, avoiding a large amount of heat loss, and ensuring that the drain pipe 24 of the gas-liquid separator 19 delivers pure liquid phase heat transfer oil, thereby improving the circulation pressure stability of the pure liquid phase heat transfer oil and ensuring the heating stability of the oil heating system.

[0044] Specifically, in this embodiment, the expansion tank 13 can also be used to compensate for the volume change of the heat transfer oil due to temperature changes. That is, the heat transfer oil that expands due to overheating can expand from the vent pipe 16 into the expansion tank 13, avoiding excessive pressure of the heat transfer oil in the circulation loop and causing malfunctions, thereby stabilizing the system's heat-carrying pressure. At the same time, it can also help the system dehydrate and vent. Preferably, in this embodiment, the expansion tank 13 is set vertically at an elevation 1.5 meters to 2 meters higher than other equipment or pipes in the system.

[0045] Furthermore, in this embodiment, the top vent pipe 14 of the expansion tank 13 is equipped with a second shut-off valve 15. During the heat transfer oil circulation heating operation, the second shut-off valve 15 is opened to allow the top vent pipe 14 of the expansion tank 13 to be open, thereby venting gas. When the system is shut down, the second shut-off valve 15 is closed to disconnect the top vent pipe 14 of the expansion tank 13, preventing external foreign objects from entering the expansion tank 13 through the vent pipe 14 and contaminating the expansion tank 13.

[0046] Due to space constraints, it is difficult to install the exhaust pipe 20 in a straight vertical position. Therefore, during actual installation, the exhaust pipe 20 will be in a curved position, so that the exhaust pipe 20 of the gas-liquid separator 19 includes a vertical pipe section 201 and an inclined pipe section 202 connected to each other, with the inclined pipe section 202 located above the vertical pipe section 201. Specifically, when the length of the vertical pipe section 201 of the exhaust pipe 20 is greater than 1 meter, the angle between the inclined pipe section 202 of the exhaust pipe 20 and the horizontal direction is between 5° and 25°, so that the gas separated by the gas-liquid separator 19 can form a rapid rising state when entering the exhaust pipe 20, thereby allowing the gas to be quickly sent to the expansion tank 13 and discharged; when the length of the vertical pipe section 201 is less than or equal to 1 meter, the angle between the inclined pipe section 202 and the horizontal direction is between 30° and 60°, so that the gas separated by the gas-liquid separator 19 can form a rapid rising state when entering the exhaust pipe 20, thereby allowing the gas to be quickly sent to the expansion tank 13 and discharged.

[0047] In this embodiment, the fuel inlet of the burner 65 is connected to the gas supply pipe 66, which carries natural gas. This allows the burner 65 to utilize natural gas as fuel, reducing environmental pollution. Specifically, the gas supply pipe 66, connected to the fuel inlet of the burner 65, is equipped with a third shut-off valve 67, a first filter 68, a pressure regulating valve 69, and a first pressure sensor 70 arranged sequentially towards the fuel inlet. The third shut-off valve 67 controls the opening and closing of the gas supply pipe 66, thereby controlling whether natural gas is supplied to the burner 65. The first filter 68 filters impurities in the natural gas, preventing them from causing wear on internal components, clogging nozzles or valves, ensuring gas safety and preventing accidents. The pressure regulating valve 69 automatically reduces the high-pressure natural gas to a safe range, preventing damage to the burner 65, loosening of pipe joints, or natural gas leakage due to excessive pressure, effectively preventing fire and explosion risks. The first pressure sensor 70 monitors the pressure of the natural gas supplied to the burner 65 in the gas supply pipe 66 in real time, ensuring the efficient and safe operation of the natural gas system.

[0048] After the third shut-off valve 67 controls the gas supply pipe 66 to disconnect and stop supplying natural gas to the burner 65, natural gas will remain in the pipeline between the third shut-off valve 67 and the burner 65. This will cause slow corrosion to the inner wall of the pipeline. Over time, this will weaken the strength of the pipeline and increase the risk of leakage. Therefore, in this embodiment, the gas supply pipe 66 is connected to the vent pipe 71 between the first pressure sensor 70 and the pressure regulating valve 69. The vent port of the vent pipe 71 is connected to the outside, and the vent pipe 71 is equipped with a ball valve 72. The ball valve 72 opens to open the vent pipe 71, so as to vent the natural gas remaining in the pipeline between the third shut-off valve 67 and the burner 65 in the gas supply pipe 66, thereby extending the pipeline life.

[0049] Furthermore, the oil heating system in this embodiment also includes an oil storage tank 44, which is located at the lowest point of the resin reactor heating system. A vent is provided at the top of the oil storage tank 44 to discharge the gas inside. Specifically, a vent pipe 42 connects the oil storage tank 44 to the oil outlet pipe 32, and an overflow pipe 21 connects the overflow port of the expansion tank 13 to the vent pipe 42. A safety valve 43 is installed in the pipeline between the overflow pipe 21 and the oil outlet pipe 32. This safety valve 43 is an automatic valve that prevents the pressure of the medium in the pipeline or equipment from exceeding a specified value by discharging the medium outside the system when the pressure of the medium in the equipment or pipeline rises above a specified value. Therefore, when the pressure of the heat transfer oil in the oil outlet pipe 32 connecting the heating boiler 31 and the resin reactor 38 is too high, the safety valve 43 is forced to open so that the overpressure heat transfer oil in the oil outlet pipe 32 can be discharged into the oil storage tank 44 through the relief pipe 42 for storage, thereby improving the safety and stability of the heating system; when the liquid level of the heat transfer oil in the expansion tank 13 rises to the overflow port of the expansion tank 13, the high liquid level heat transfer oil in the expansion tank 13 flows out from the overflow port of the expansion tank 13 into the overflow pipe 21 under the action of the high position of the expansion tank 13, and is sent to the oil storage tank 44 for storage through the relief pipe 42, thereby improving the safety and stability of the expansion tank 13.

[0050] Preferably, in this embodiment, the oil drain port at the bottom of the expansion tank 13 is connected to the overflow pipe 21 via the discharge pipe 22, and the discharge pipe 22 is equipped with a sixth shut-off valve 23. Thus, when a sudden power outage or a failure of the circulating pump 30 necessitates an emergency shutdown, the sixth shut-off valve 23 can be controlled to open so that the oil drain port at the bottom of the expansion tank 13 is connected to the overflow pipe 21 via the discharge pipe 22. At this time, the cooling heat transfer oil in the expansion tank 13 uses its potential energy to force the safety valve 43 to open so that it enters the furnace tube of the heating boiler 31 through the discharge pipe 42 and the oil outlet pipe 32, thereby preventing the heat transfer oil in the furnace tube from overheating and ensuring the safety of the heating boiler 31.

[0051] Furthermore, in this embodiment, the oil outlet pipe 32 is connected to the suction pipe 18 via a bypass pipe 40 between the discharge pipe 42 and the resin reactor 38. The bypass pipe 40 is equipped with a regulating valve 41. The first section of the oil outlet pipe 32 between the heating boiler 31 and the discharge pipe 42 is equipped with a second pressure sensor 33 and a first temperature sensor 34. The second section of the oil outlet pipe 32 between the discharge pipe 42 and the bypass pipe 40 is equipped with a flow sensor 35 and a fourth shut-off valve 36. The third section of the oil outlet pipe 32 between the bypass pipe 40 and the resin reactor 38 is equipped with a fifth shut-off valve 37. Therefore, during the preset time after the heating boiler 31 of the resin reactor heating system starts combustion, or when the resin reactor 38 does not require heat transfer oil, the fourth shut-off valve 36 and the regulating valve 41 are opened, and the fifth shut-off valve 37 is closed. This creates an internal circulation loop for the heat transfer oil between the heating boiler 31, the oil outlet pipe 32, the bypass pipe 40, the suction pipe 18, the gas-liquid separator 19, the drain pipe 24, the circulating pump 30, and the return oil pipe 26. This rapidly increases or stabilizes the temperature of the heat transfer oil, thereby improving heating efficiency and stability. Furthermore, during the heating process of the resin reactor 38, i.e., when the fourth shut-off valve 36 and the fifth shut-off valve 37 are opened, the regulating valve 41 also adjusts its opening according to the oil consumption of the resin reactor 38 to improve the stability of oil supply to the resin reactor 38, thus enhancing system stability.

[0052] In addition, the oil heating system in this embodiment also includes an oil inlet pipe 52, an inlet / outlet pump 53, an oil injection pipe 12, an oil discharge pipe 58, and a discharge pipe 10. The inlet / outlet pump 53 is connected between the oil inlet pipe 52 and the oil injection pipe 12. The oil inlet pipe 52 is used to connect the heat transfer oil. The oil injection port of the oil injection pipe 12 is connected to the expansion tank 13. A filling pipe 56 is connected between the oil injection pipe 12 and the oil storage tank 44. The filling pipe 56 is equipped with a seventh shut-off valve 57. The oil inlet pipe 52 is equipped with an eighth shut-off valve 54 and a second shut-off valve 55. The filter 55 is connected adjacent to the outlet pump 53. One end of the oil drain pipe 58 is connected to the pipeline between the oil inlet pipe 52 and the eighth shut-off valve 54 and the second filter 55. The other end of the oil drain pipe 58 is connected to the oil outlet at the bottom of the oil storage tank 44 through the first branch pipe 59. The first branch pipe 59 is equipped with a ninth shut-off valve 60. The discharge pipe 10 is connected to the oil injection pipe 12 for discharging heat transfer oil. The discharge pipe 10 is equipped with a tenth shut-off valve 11.

[0053] In this embodiment, a minimum liquid level threshold is set in the expansion tank 13. Preferably, the minimum liquid level threshold in this embodiment is 400 mm. When the real-time liquid level of the heat transfer oil in the expansion tank 13 is less than the minimum liquid level threshold, that is, when the real-time liquid level of the heat transfer oil in the expansion tank 13 is detected to be less than 400 mm, it indicates that the amount of oil circulating in the oil heating system is insufficient. Then, the eighth shut-off valve 54 is opened and the inlet / outlet pump 53 is started. At this time, the ninth shut-off valve 60 and the tenth shut-off valve 11 are closed, so that external heat transfer oil is replenished into the expansion tank 13 through the oil inlet pipe 52 and the oil injection pipe 12, thereby quickly replenishing the heat transfer oil to the oil heating system. At the same time, the seventh shut-off valve 57 can be selectively opened to replenish the external heat transfer oil into the oil storage tank 44 through the oil filling pipe 56 for storage and standby. Moreover, the second filter 55 can filter impurities from the heat transfer oil entering the oil injection pipe 12.

[0054] In order to monitor the real-time liquid level of the heat transfer oil in the expansion tank 13, the expansion tank 13 is equipped with a first liquid level gauge in this embodiment; in order to monitor the real-time liquid level of the heat transfer oil in the oil storage tank 44, the oil storage tank 44 is equipped with a second liquid level gauge in this embodiment.

[0055] When it is necessary to inject the heat transfer oil in the oil storage tank 44 into the expansion tank 13, the inlet and outlet pump 53 is started and the ninth shut-off valve 60 is opened. At this time, the seventh shut-off valve 57, the eighth shut-off valve 54, and the tenth shut-off valve 11 are closed, so that the heat transfer oil in the oil storage tank 44 can be injected into the expansion tank 13 through the first branch pipe 59, the oil drain pipe 58, the oil inlet pipe 52, and the oil injection pipe 12.

[0056] When there is too much heat transfer oil in the oil heating system, or when equipment needs to be replaced for maintenance, the heat transfer oil needs to be drained. This will start the inlet and outlet pumps 53 and control the ninth shut-off valve 60 and the tenth shut-off valve 11 to open. At this time, the seventh shut-off valve 57 and the eighth shut-off valve 54 are in the closed state, so that the heat transfer oil can be discharged from the system through the first branch pipe 59, the oil drain pipe 58, the oil inlet pipe 52, the oil injection pipe 12 and the discharge pipe 10.

[0057] In addition, this embodiment uses two circulating pumps 30. Two flow pipes 45 are connected in parallel between the drain pipe 24 and the return oil pipe 26. One circulating pump 30 is mounted on one flow pipe 45. Each flow pipe 45 has an eleventh shut-off valve 46, a third filter 47, and a first expansion joint 48 in the first pipe between the circulating pump 30 and the drain pipe 24. Each flow pipe 45 also has a second expansion joint 49 and a twelfth shut-off valve 50 in the second pipe between the circulating pump 30 and the return oil pipe 26. The first expansion joint 48 and the second expansion joint 49 are respectively located adjacent to the two pump ports of the circulating pump 30. In actual operation, only one circulating pump 30 is activated, while the other circulating pump 30 serves as a backup to ensure continuous operation. Specifically, the third filter 47 filters impurities from the heat transfer oil entering the return oil pipe 26. Furthermore, the two pump ports of the circulating pump 30 are respectively equipped with a first expansion joint 48 and a second expansion joint 49. An expansion joint, also known as a telescoping joint or compensator, is a connecting device used to absorb the deformation of the pipeline system caused by thermal expansion and contraction, vibration and geological changes. Therefore, the expansion joints installed at the inlet and outlet of the circulating pump 30 can compensate for displacement, absorb vibration, eliminate thermal stress and enhance sealing, so as to ensure the safe, stable and long-term operation of the circulating pump 30.

[0058] To improve the stability of the heat transfer oil circulation loop, the return oil pipe 26 in this embodiment is equipped with a thirteenth shut-off valve 27, a third pressure sensor 28, and a second temperature sensor 29. In addition, the drain pipe 24 in this embodiment is equipped with a fourth pressure sensor 25. Furthermore, when the distance between the circulation pump 30 and the heating boiler 31 is greater than 5 meters, the second pipe corresponding to the circulation pump 30 is equipped with a fifth pressure sensor 51.

[0059] In order to quickly drain the heat transfer oil in the system and improve the oil change efficiency, in this embodiment, the other end of the drain pipe 58 is connected to the first pipe of a flow pipe 45 through the second branch pipe 61. The second branch pipe 61 is equipped with a fourteenth shut-off valve 62, and the other end of the drain pipe 58 is connected to the first pipe of another flow pipe 45 through the third branch pipe 63. The third branch pipe 63 is equipped with a fifteenth shut-off valve 64. Therefore, when it is necessary to drain the heat transfer oil in the oil heating system, the inlet and outlet pumps 53 are started, and the fourth shut-off valve 36, the fifth shut-off valve 37, the eleventh shut-off valve 46, the twelfth shut-off valve 50, the thirteenth shut-off valve 27, the tenth shut-off valve 11, the ninth shut-off valve 60, the fourteenth shut-off valve 62, and the fifteenth shut-off valve 64 are opened. At this time, the seventh shut-off valve 57 and the eighth shut-off valve 54 are closed, so that the heat transfer oil in the oil storage tank 44, the heating boiler 31, the resin reactor 38, and each pipeline is quickly discharged from the system through the discharge pipe 10. At the same time, the sixth shut-off valve 23 is opened, so that the heat transfer oil in the expansion tank 13 is sent to the oil storage tank 44 for simultaneous drainage, thereby quickly draining the heat transfer oil in the system.

[0060] Example of a heating control method for a resin reactor heating system: The heating control method of the resin reactor heating system in this embodiment is the same as the heating control method of the resin reactor heating system in the above embodiment, including: internal circulation operation, stable heating operation, abnormal fault operation, and oil shortage injection operation.

[0061] When the heating boiler 31 starts combustion within a preset time or when the resin reactor 38 does not require heat transfer oil, the heating control method in this embodiment performs internal circulation operation.

[0062] Specifically, the internal circulation operation in this embodiment includes: controlling the fourth shut-off valve 36 and the regulating valve 41 to open, starting the circulation pump 30, and closing the fifth shut-off valve 37, thereby forming an internal circulation loop of heat transfer oil between the heating boiler 31, the oil outlet pipe 32, the bypass pipe 40, the suction pipe 18, the gas-liquid separator 19, the drain pipe 24, the circulation pump 30, and the return oil pipe 26, so as to quickly increase the temperature of the heat transfer oil or stabilize the temperature of the heat transfer oil, thereby improving the heating efficiency and heating stability.

[0063] When heat transfer oil is supplied to the resin reactor 38, the heating control method in this embodiment performs stable heating operation.

[0064] Specifically, the stable heating operation in this embodiment includes: controlling the fourth shut-off valve 36, regulating valve 41 and fifth shut-off valve 37 to open, and starting the circulation pump 30, so that a heat transfer oil heating circulation loop is formed between the heating boiler 31, oil outlet pipe 32, resin reactor 38, suction pipe 18, gas-liquid separator 19, drain pipe 24, circulation pump 30 and return oil pipe 26, and the bypass pipe 40 connects the oil outlet pipe 32 and the suction pipe 18, and the regulating valve 41 adjusts the opening degree of the regulating valve 41 according to the oil consumption of the resin reactor 38, so as to improve the stability of oil supply to the resin reactor 38, thereby improving the system stability.

[0065] When the heating boiler 31 experiences an emergency shutdown, the heating control method in this embodiment performs an abnormal fault operation.

[0066] Specifically, the abnormal fault operation in this embodiment includes: controlling the sixth shut-off valve 23 to open, so that the bottom oil outlet of the expansion tank 13 is connected to the overflow pipe 21 through the discharge pipe 22. Then, the cooling heat transfer oil in the expansion tank 13 uses its potential energy to force the safety valve 43 to open so that it enters the furnace tube of the heating boiler 31 through the discharge pipe 42 and the oil outlet pipe 32, thereby preventing the heat transfer oil in the furnace tube from overheating and ensuring the safety of the heating boiler 31.

[0067] When the real-time liquid level of the heat transfer oil in the expansion tank 13 is less than the minimum liquid level threshold, that is, when the real-time liquid level of the heat transfer oil in the expansion tank 13 is detected to be less than 400 mm, it indicates that the amount of oil circulating in the oil heating system is insufficient. Therefore, the heating control method in this embodiment performs an oil shortage injection operation.

[0068] Specifically, the oil injection operation in this embodiment includes: controlling the eighth shut-off valve 54 to open, starting the inlet and outlet pump 53, and controlling the ninth shut-off valve 60 and the tenth shut-off valve 11 to close, so as to replenish the expansion tank 13 with external heat transfer oil through the oil inlet pipe 52 and the oil injection pipe 12, thereby quickly replenishing the oil heating system with heat transfer oil.

[0069] Therefore, the heating control method of the resin reactor heating system in this embodiment can accurately and stably meet the different reaction temperature requirements of the resin reactor 38, and achieve safe, stable and efficient heating of the resin reactor 38.

[0070] The above embodiments are merely preferred examples of the present invention and are not intended to limit the scope of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles of the present invention in accordance with the claims of the present invention should be included within the scope of the present invention patent application.

Claims

1. A resin reactor heating system, comprising an oil heating system and a steam heating system, wherein the oil heating system includes a burner, a heating boiler, a gas-liquid separator, an expansion tank, and a circulating pump; the burner is connected to the furnace of the heating boiler; the oil outlet pipe of the heating boiler is connected to the oil inlet of the resin reactor; the suction pipe of the gas-liquid separator is connected to the oil outlet of the resin reactor; and the exhaust pipe of the gas-liquid separator is connected to the bottom port of the expansion tank; the two ports of the circulating pump are respectively connected to the liquid outlet pipe of the gas-liquid separator and the oil return pipe of the heating boiler; the steam outlet pipe of the steam heating system is connected to the steam inlet of the resin reactor; and the return pipe of the steam heating system is connected to the discharge port of the resin reactor, characterized in that: The expansion tank is located at the highest point of the resin reactor heating system and is horizontally offset from the heating boiler, and the top of the expansion tank is connected to an exhaust pipe. The oil heating system further includes a return air duct, a mixing air duct, a blower, an air preheater, and a heat exchanger. The air preheater and the heat exchanger are respectively installed in the flue of the heating boiler, with the air preheater located below the heat exchanger. The blower is installed on the mixing air duct and divides the mixing air duct into an air inlet section and an air outlet section. The air inlet of the air inlet section draws in external cold air. The two ends of the return air duct connect the air inlet section and the flue, and the connection between the return air duct and the flue is located between the air preheater and the heat exchanger. The air preheater connects the air outlet of the air outlet section and the air inlet of the burner. The water medium in the heat exchanger supplies the steam heating system.

2. The resin reactor heating system according to claim 1, characterized in that: A vent pipe is connected between the suction pipe and the expansion tank, and the vent pipe is equipped with a first shut-off valve. And / or, the vent pipe is provided with a second shut-off valve; And / or, the exhaust pipe includes a vertical pipe section and an inclined pipe section connected together, the inclined pipe section being located above the vertical pipe section; when the length of the vertical pipe section is greater than 1 meter, the angle of inclination between the inclined pipe section and the horizontal direction is between 5° and 25°; when the length of the vertical pipe section is less than or equal to 1 meter, the angle of inclination between the inclined pipe section and the horizontal direction is between 30° and 60°.

3. The resin reactor heating system according to claim 1, characterized in that: The fuel inlet of the burner is connected to the gas supply pipe, and natural gas flows through the gas supply pipe; The gas supply pipe is provided with a third shut-off valve, a first filter, a pressure regulating valve and a first pressure sensor arranged in sequence toward the fuel inlet. The gas supply pipe is connected to the first pressure sensor and the pressure regulating valve by a vent pipe. The vent pipe's exhaust port is connected to the outside, and the vent pipe is equipped with a ball valve.

4. The resin reactor heating system according to any one of claims 1 to 3, characterized in that: The oil heating system also includes an oil storage tank, which is located at the lowest point of the resin reactor heating system, and the top of the oil storage tank is provided with a vent. A drain pipe is connected between the oil storage tank and the oil outlet pipe, and an overflow pipe is connected between the overflow port of the expansion tank and the drain pipe. A safety valve is installed in the drain pipe between the overflow pipe and the oil outlet pipe.

5. The resin reactor heating system according to claim 4, characterized in that: The oil outlet pipe is connected to the suction pipe via a bypass pipe between the discharge pipe and the resin reactor. The bypass pipe is equipped with a regulating valve. The first section of the oil outlet pipe between the heating boiler and the discharge pipe is equipped with a second pressure sensor and a first temperature sensor. The second section of the oil outlet pipe between the discharge pipe and the bypass pipe is equipped with a flow sensor and a fourth shut-off valve. The third section of the oil outlet pipe between the bypass pipe and the resin reactor is equipped with a fifth shut-off valve. And / or, the oil drain port at the bottom of the expansion tank is connected to the overflow pipe through a drain pipe, and the drain pipe is equipped with a sixth shut-off valve.

6. The resin reactor heating system according to claim 4, characterized in that: The oil heating system also includes an oil inlet pipe, an inlet / outlet pump, an oil injection pipe, an oil drain pipe, and an outlet pipe. The inlet / outlet pump is connected between the oil inlet pipe and the oil injection pipe. The oil inlet pipe is used to connect to heat transfer oil. The oil injection port of the oil injection pipe is connected to the expansion tank. A refueling pipe is connected between the oil injection pipe and the oil storage tank. The refueling pipe is equipped with a seventh shut-off valve. The oil inlet pipe is equipped with an eighth shut-off valve and a second filter. The second filter is located adjacent to the inlet / outlet pump. One end of the oil drain pipe is connected to the pipeline between the oil inlet pipe and the eighth shut-off valve and the second filter, and the other end of the oil drain pipe is connected to the oil outlet at the bottom of the oil storage tank through the first branch pipe. The first branch pipe is equipped with a ninth shut-off valve. The drain pipe is connected to the oil inlet pipe for draining heat transfer oil, and the drain pipe is equipped with a tenth shut-off valve.

7. The resin reactor heating system according to claim 6, characterized in that: The number of circulating pumps is two, and two flow pipes are connected in parallel between the drain pipe and the return oil pipe, with one circulating pump installed on one of the flow pipes; Each of the flow pipes is provided with an eleventh shut-off valve, a third filter and a first expansion joint in the first pipe between the circulation pump and the drain pipe, and a second expansion joint and a twelfth shut-off valve in the second pipe between the circulation pump and the return oil pipe. The first expansion joint and the second expansion joint are respectively located adjacent to the two pump ports of the circulation pump.

8. The resin reactor heating system according to claim 7, characterized in that: The return oil pipe is equipped with a thirteenth shut-off valve, a third pressure sensor, and a second temperature sensor. And / or, the drain pipe is equipped with a fourth pressure sensor; And / or, when the distance between the circulating pump and the heating boiler is greater than 5 meters, a fifth pressure sensor is installed on the second pipeline corresponding to the circulating pump.

9. The resin reactor heating system according to claim 7, characterized in that: The other end of the drain pipe is connected to one of the first pipes via a second branch pipe, the second branch pipe being equipped with a fourteenth shut-off valve, and the other end of the drain pipe is connected to another of the first pipes via a third branch pipe, the third branch pipe being equipped with a fifteenth shut-off valve.

10. A heating control method for a resin reactor heating system, characterized in that: The resin reactor heating system is the resin reactor heating system as described in any one of claims 6 to 9 above, and the heating control method includes: internal circulation operation, stable heating operation, abnormal fault operation, and oil shortage injection operation. When the heating boiler is turned on for a preset time or when the resin reactor does not require heat transfer oil, the heating control method performs the internal circulation operation; the internal circulation operation includes: controlling the fourth shut-off valve and the regulating valve to open, turning on the circulation pump, and closing the fifth shut-off valve, so that an internal circulation loop of heat transfer oil is formed between the heating boiler, the oil outlet pipe, the bypass pipe, the suction pipe, the gas-liquid separator, the drain pipe, the circulation pump, and the return oil pipe; When heat transfer oil is supplied to the resin reactor, the heating control method performs the stable heating operation; the stable heating operation includes: controlling the fourth shut-off valve, the regulating valve and the fifth shut-off valve to open, and starting the circulation pump, so that a heat transfer oil heating circulation loop is formed between the heating boiler, the oil outlet pipe, the resin reactor, the suction pipe, the gas-liquid separator, the drain pipe, the circulation pump and the return oil pipe, and making the bypass pipe connect the oil outlet pipe and the suction pipe, and the regulating valve adjusts the valve opening according to the oil consumption of the resin reactor; When the heating boiler experiences an emergency shutdown, the heating control method executes the abnormal fault operation, which includes: controlling the sixth shut-off valve to open, so that the bottom oil outlet of the expansion tank is connected to the overflow pipe through the discharge pipe. Then, the cooling heat transfer oil in the expansion tank uses its potential energy to force the safety valve to open so that it can enter the furnace tube of the heating boiler through the vent pipe and the oil outlet pipe, thereby preventing the heat transfer oil in the furnace tube from overheating. When the real-time liquid level of the heat transfer oil in the expansion tank is less than the minimum liquid level threshold, the heating control method performs the oil shortage injection operation; the oil shortage injection operation includes: controlling the eighth shut-off valve to open, starting the inlet and outlet pumps, and controlling the ninth and tenth shut-off valves to close, so as to replenish the expansion tank with external heat transfer oil through the oil inlet pipe and the oil injection pipe.

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