Intrinsically safe and low energy consumption ethylene propoxylation loop reaction device and control method thereof

Abstract

The present invention discloses an intrinsically safe and low-energy consumption ethylene propoxylation loop reaction device, comprising a pre-reaction unit, a reaction unit, a water conduction unit and a heat energy utilization unit, wherein the heat energy utilization unit is used to obtain and store the heat energy of the first reaction heat exchanger and the second reaction heat exchanger, and the water conduction unit further controls the temperature of the pre-reactor and the reactor to output water of corresponding temperature to the pre-reaction heat exchanger, the first reaction heat exchanger and the second reaction heat exchanger, and the reaction conditions of the pre-reactor and the reactor are controlled in a non-flammable zone. In the above manner, the present invention increases the heat storage process, absorbs and stores the reaction heat during the reaction, and supplies it to the pre-reactor, the reactor, the primary energy user and the secondary energy user, so as to achieve heat energy creation and reduce the amount of circulating water, greatly reduce energy consumption, make the reaction in the non-combustion zone, achieve low-pressure intrinsically safe reaction, high safety and low equipment investment.

Description

Technical Field

[0001] The invention belongs to the technical field of ethylpropoxylation production process equipment, in particular to an intrinsically safe low-energy consumption ethylpropoxylation loop reaction device and a control method thereof. Background Art

[0002] Ethoxylation is a ring-opening polymerization reaction of active hydrogen-containing substances with ethylene oxide / propylene oxide (ethylene oxide, propylene oxide single polymerization, block polymerization or mixed polymerization, hereinafter referred to as ethylene oxide / ethoxylation) in the presence of a catalyst. It is the most important reaction of ethylene oxide derivatives, and its products are widely used in construction, daily chemicals, coatings, textiles, agricultural products, rubber and other fields.

[0003] At present, the main ethoxylation reaction processes include intermittent stirring process, external circulation spray process (representative process: PI company ethoxylation reaction process Pressindustria, referred to as spray process) and BUSS injection loop process (representative process: BUSS company loop reaction process (BLR), hereinafter referred to as injection process), and its typical configuration is pre-treatment unit, reaction unit and post-treatment unit. Among them, the pre-treatment unit is mainly used for dissolving and dispersing raw materials and catalysts, dehydrating and heating to the reaction temperature, and doing the pre-reaction work; the reaction unit is mainly for the polymerization reaction of raw materials and ethylene oxide, and the crude product is obtained after the polymerization reaches the target molecular weight; the post-treatment unit is mainly for stripping and neutralizing the low-boiling raw materials and by-products in the crude product, so that the product loses its reaction activity and obtains a stable finished product.

[0004] The intermittent stirring process is an obsolete process and has been phased out except for the use of ultra-high viscosity products.

[0005] As the mainstream process, the spray process accounts for about 80% of the equipment, has good product efficiency, and can adapt to the production of products with a viscosity of less than 300cp. However, its batch operation is in the ethylene oxide explosion zone for about 30% to 50% of the time, and there are hidden dangers in the system safety; at the same time, compared with the BUSS process, its product distribution is relatively wide, and the by-product dioxane and residual ethylene oxide after the reaction are both excessive and need to be post-processed to meet the requirements, and the product quality is slightly flawed.

[0006] The BUSS process uses high-pressure nitrogen protection to ensure that the reaction process is in the ethylene oxide safety zone, achieving intrinsic safety. However, the equipment manufacturing cost has increased exponentially, and the operation and maintenance cost is high. At the same time, the process is only suitable for the stable production of products below 30cp. When the operating viscosity reaches 50cp, the system heat conduction is out of control, and the system safety and product quality stability are completely lost.

[0007] In addition to their own defects, the above processes still have the following common defects:

[0008] The ethoxylation reaction is a highly exothermic reaction. Existing processes all use circulating water to remove the reaction heat. The heat transfer consumes a lot of energy. Some devices use hot water produced as a byproduct of the reaction heat, but due to the limitations of downstream users' usage conditions, the actual effect is general. More than 90% of the system's cooling capacity is still removed by circulating water, and the circulating water consumption per ton of product is about 50~80m3 / t.

[0009] The pretreatment of raw materials and post-treatment of products for ethoxylation reaction require a certain amount of energy. The raw materials need to be heated to the dehydration temperature and the pre-reaction temperature using steam. The post-treatment dehydration of the product needs to maintain a certain temperature. The steam consumption is about 0.1~0.5t / t, which leads to high energy consumption. Summary of the invention

[0010] In view of the deficiencies in the prior art, the present invention provides an intrinsically safe and low-energy consumption ethylene propoxylation loop reaction device and a control method thereof, which can solve the above technical problems.

[0011] A technical solution adopted by the present invention to solve its technical problem is: the intrinsically safe low-energy consumption ethylene propoxylation loop reaction device described in the present invention is characterized in that it comprises: a pre-reaction unit, comprising a pre-reactor for receiving raw materials and catalysts, a pre-reaction pump, a pre-reaction heat exchanger and a first venturi ejector, wherein the first venturi ejector is arranged in the pre-reactor, the output port of the pre-reactor is connected to the input port of the pre-reaction pump through a first pipe body, the output port of the pre-reaction pump is connected to the first input port of the pre-reaction heat exchanger through a second pipe body, and the first input port of the pre-reaction heat exchanger is connected to the first input port of the pre-reaction heat exchanger through a second pipe body. The outlet is connected to the top of the pre-reactor through a third tube body, and the third tube body is connected to the first venturi ejector; the reaction unit includes a reactor, a first reaction circulation pump, a first reaction heat exchanger, a second venturi ejector, a second reaction circulation pump, a second reaction heat exchanger and a sprayer, wherein the second venturi ejector and the sprayer are arranged in the reactor, the first input port of the reactor is connected to the output port of the pre-reaction pump through a fourth tube body, the input port of the first reaction circulation pump is connected to the first output port of the reactor through a fifth tube body, and the output port of the first reaction circulation pump is connected to the first output port of the reactor through a fifth tube body. The outlet is connected to the first input port of the first reaction heat exchanger through the sixth pipe body, the first output port of the first reaction heat exchanger is connected to the top of the reactor through the seventh pipe body, and the seventh pipe body is connected to the second venturi ejector, the input port of the second reaction circulation pump is connected to the first output port of the reactor through the eighth pipe body, the output port of the second reaction circulation pump is connected to the first input port of the second reaction heat exchanger through the ninth pipe body, the first output port of the second reaction heat exchanger is connected to the top of the reactor through the tenth pipe body, and the tenth pipe body is connected to the sprayer; a hot water unit, used for heating or cooling the heated water, connected to the pre-reaction heat exchanger, the first reaction heat exchanger and the second reaction heat exchanger, and used for controlling the temperature of the output water according to the temperature of the pre-reaction heat exchanger and the reactor, so as to output heated water of corresponding temperature to the pre-reaction heat exchanger, the first reaction heat exchanger and the second reaction heat exchanger, so as to keep the pre-reaction heat exchanger and the reactor working in a stable temperature state; a heat energy utilization unit, connected to the first reaction heat exchanger and the second reaction heat exchanger, and used for acquiring and storing the heat energy of the first reaction heat exchanger and the second reaction heat exchanger.

[0012] Further, when the temperature in the pre-reactor is lower than a first preset low-temperature value, the water transfer unit generates hot water and transports hot water to the pre-reaction heat exchanger to increase the temperature in the pre-reactor; when the temperature in the pre-reactor is higher than a first preset high-temperature value, the water transfer unit generates cold water and transports cold water to the pre-reaction heat exchanger to lower the temperature in the pre-reactor; when the temperature in the reactor is lower than a second preset low-temperature value, the water transfer unit generates hot water and transports hot water to the first reaction heat exchanger and the second reaction heat exchanger to increase the temperature in the reactor; when the temperature in the reactor is higher than the second preset high-temperature value, the water transfer unit generates cold water and transports cold water to the first reaction heat exchanger and the second reaction heat exchanger to lower the temperature in the reactor.

[0013] Furthermore, when the temperature in the reactor is higher than a second preset high temperature value, the heat energy utilization unit is first controlled to be connected to the first reaction heat exchanger and the second reaction heat exchanger, so as to obtain and store the high-temperature heat energy in the first reaction heat exchanger and the second reaction heat exchanger through the high-temperature energy storage medium in the heat energy utilization unit. When the temperature of the high-temperature energy storage medium in the heat energy utilization unit reaches the preset storage temperature, the water conduction unit is controlled to be connected to the first reaction heat exchanger and the second reaction heat exchanger, and the water conduction unit is controlled to generate cold water to transport cold water to the first reaction heat exchanger and the second reaction heat exchanger to reduce the temperature in the reactor.

[0014] Further, the water conduction unit includes a water conduction expansion tank containing water conduction, a water conduction pump, a water conduction heater and a water conduction cooler, wherein the water conduction is desalted water, the output port of the water conduction expansion tank is connected to the input port of the water conduction pump through a first water pipe, the output port of the water conduction pump is connected to the first input port of the water conduction heater through a second water pipe, the output port of the water conduction pump is connected to the first input port of the water conduction cooler through a third water pipe, the first output port of the water conduction heater is connected to the second input port of the pre-reaction heat exchanger through a fourth water pipe, the second output port of the pre-reaction heat exchanger is connected to the input port of the water conduction pump through a fifth water pipe, the first output port of the water conduction heater is connected to the second input port of the first reaction heat exchanger through a sixth water pipe, and the second output port of the first reaction heat exchanger is connected to the first input port of the water conduction cooler through a seventh water pipe. The first output port of the water conduction water heater is connected to the second input port of the second reaction heat exchanger through an eighth water pipe, and the second output port of the second reaction heat exchanger is connected to the input port of the water conduction water pump through a ninth water pipe; the first output port of the water conduction water cooler is connected to the second input port of the pre-reaction heat exchanger through a tenth water pipe, the first output port of the water conduction water cooler is connected to the second input port of the first reaction heat exchanger through an eleventh water pipe, and the first output port of the water conduction water cooler is connected to the second input port of the second reaction heat exchanger through a twelfth water pipe; wherein the first water pipe, the second water pipe, the third water pipe, the fourth water pipe, the fifth water pipe, the sixth water pipe, the seventh water pipe, the eighth water pipe, the ninth water pipe, the tenth water pipe, the eleventh water pipe and the twelfth water pipe are all provided with control valves.

[0015] Furthermore, the heat energy utilization unit includes a heat energy storage tank for storing high-temperature energy storage medium, a heat energy pump, a primary heat source user and a secondary heat source user, wherein the output port of the heat energy storage tank is connected to the input port of the heat energy pump through a first insulation pipe, the output port of the heat energy pump is connected to the third input port of the first reaction heat exchanger through a second insulation pipe, the third output port of the first reaction heat exchanger is connected to the input port of the primary heat source user through a third insulation pipe, the output port of the heat energy pump is connected to the third input port of the second reaction heat exchanger through a fourth insulation pipe, the third output port of the second reaction heat exchanger is connected to the input port of the primary heat source user through a fifth insulation pipe, the output port of the primary heat source user is connected to the input port of the secondary heat source user through a sixth insulation pipe, and the output port of the secondary heat source user is connected to the input port of the heat energy storage tank through a seventh insulation pipe.

[0016] Furthermore, the temperature required by the first-level heat source users is higher than the temperature required by the second-level heat source users. The first-level heat source users include equipment for materials that require heating, thermal energy power generation systems, steam-producing equipment, and thermal energy-generated low-temperature cold water equipment. The second-level heat source users include heating equipment, low-temperature material production equipment, and thermal energy-generated medium-temperature cold water equipment.

[0017] The beneficial effects of the present invention are as follows:

[0018] Compared with the prior art, the present invention provides an intrinsically safe and low-energy consumption ethylene propoxylation loop reaction device and a control method thereof, which has the following beneficial effects:

[0019] 1. Use a pre-reaction unit instead of a pre-treatment unit. The pre-reaction unit adopts a jet loop reaction process to produce product intermediates. The intermediates are transferred to the reactor to continue to react to generate products. Combined with the double-loop design of the reactor, the product growth ratio can reach 60~120, while avoiding quality and operation fluctuations caused by residues when converting products of different molecular weights. When the product growth ratio is within 70, the production is increased by 100%~300% compared with the existing one-step process, and the production efficiency is increased by 10%~40% compared with the two-step process;

[0020] 2. Add a heat storage process to absorb and store reaction heat during the reaction. The high-temperature high-temperature energy storage medium is used for the primary heat source users and the secondary heat source users in turn to achieve zero steam operation of the device, public area, raw material and finished product area. At the same time, the surplus heat can be used for power generation, etc. During the reaction interval, the heat energy released by the thermal energy storage tank meets the operation needs of the device and achieves thermal energy creation;

[0021] 3. The use of thermal energy storage tanks in the energy storage system can effectively reduce the demand for heat removal from the circulating water system. Circulating water is only used as a supplementary measure and safety guarantee. The circulating water consumption per ton of product is reduced to 10~30m3 / t. At the same time, the utilization of thermal energy is improved to achieve high-quality heat utilization, reducing the system's electricity consumption, steam consumption and circulating water consumption;

[0022] 4. Use hot water as the intermediate medium for heat exchange between the reaction materials and the circulating water. The hot water is desalted water. Under nitrogen-sealed conditions, the system corrosion and scaling problems are solved, and the reaction is in the non-explosive zone of ethylene oxide, achieving an intrinsically safe reaction.

[0023] 5. The water transfer unit adopts dual heat exchangers for heating and cooling, which can realize three modes: hot water supply alone, hot and cold water sharing, and cold water supply alone. Hot water supply alone can be used for steam heating under specific conditions, such as the first start-up of the system or long-term shutdown and start-up as a backup guarantee. The hot and cold water sharing mode can realize high-temperature operation of the water transfer system, which can be used for heat utilization such as initial heating of pre-reaction unit materials and reaction unit materials. The cold water supply alone mode can be used for normal cooling supplement of the system to optimize the use of hot water / circulating water;

[0024] 6. Add a closed inspection system for the gas phase components of the prereactor and reactor, monitor the oxygen content in the prereactor and reactor through real-time gas detection, and establish a system intrinsic safety control model based on the nitrogen-air and ethylene oxide three-dimensional explosion model and the system process operation status. Use the safety pressure as the output to control the reaction system operating pressure and the ethylene oxide / propylene oxide addition rate to ensure that the system operates in the ethylene oxide non-explosion zone to achieve intrinsic safety. Gas detection uses non-combustion and oxygen-free processes to avoid safety hazards and environmental pollution caused by combustion emissions. The oxygen-free process upgrade can provide higher measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] Figure 1 It is a schematic diagram of the structure of the intrinsically safe and low-energy consumption ethylpropoxylation loop reaction device of the present invention;

[0027] Figure 2 yes Figure 1 A first partial structural schematic diagram of the device;

[0028] Figure 3 yes Figure 1 A second partial structural schematic diagram of the device;

[0029] Figure 4 yes Figure 1 A third partial structural schematic diagram of the device;

[0030] Figure 5 It is a structural schematic diagram of the primary heat source user of the present invention. DETAILED DESCRIPTION

[0031] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0032] like Figure 1-4 As shown, the present invention discloses an intrinsically safe and low-energy consumption ethylene propoxylation loop reaction device, which includes a pre-reaction unit, a reaction unit, a hot water conduction unit and a heat energy utilization unit.

[0033] The pre-reaction unit includes a pre-reactor 10 for receiving raw materials and catalysts, a pre-reaction pump 11 , a pre-reaction heat exchanger 12 and a first venturi ejector, wherein the first venturi ejector is disposed in the pre-reactor 10 .

[0034] In this embodiment, the output port of the pre-reactor 10 is connected to the input port of the pre-reaction pump 11 through the first pipe body, the output port of the pre-reaction pump 11 is connected to the first input port of the pre-reaction heat exchanger 12 through the second pipe body, the first output port of the pre-reaction heat exchanger 12 is connected to the top of the pre-reactor 10 through the third pipe body, and the third pipe body is connected to the first Venturi ejector.

[0035] Specifically, raw materials and catalysts are put into the pre-reactor 10, and the pre-reaction pump 11 is started to realize circulation. The high-temperature hot water of the hot water unit or the high-temperature energy storage medium of the heat energy utilization unit is used to heat the materials in the pre-reactor 10 to the initial reaction temperature. A certain amount of ethylene oxide and propylene oxide are continuously added according to the production formula, and the flow rate of ethylene oxide or propylene oxide is controlled during the reaction. When the amount of ethylene oxide and propylene oxide added reaches the target value, the addition is stopped, and the temperature is maintained and the circulation is continued for a certain period of time to completely react the unreacted substances in the system to obtain a product with a certain molecular weight, commonly known as an intermediate, and the growth ratio of the intermediate is 2~8.

[0036] It should be understood that, under the drive of the pre-reaction pump 11, the first venturi ejector forms a strong turbulent mass transfer of the material, ethylene oxide and propylene oxide in the inner cavity of the first venturi ejector, realizes rapid mixing, dispersion and reaction, and can realize the reaction of about 90% of ethylene oxide and propylene oxide at one time, with basically no induction period of the reaction, reducing the generation of by-products.

[0037] Furthermore, the negative pressure port of the first venturi ejector is connected to the upper space in the prereactor 10 through the first connecting pipe, so that the unreacted gaseous ethylene oxide and propylene oxide in the prereactor 10 can be sucked into the inner cavity of the first venturi ejector again, and the reaction is repeated continuously until the reaction is complete. The by-products and residues in the reaction products can reach the level after post-treatment of the external circulation spray process. At the same time, the residual amount of gaseous ethylene oxide and propylene oxide after the reaction can be reduced to 10% to 50% of that in the external circulation spray process.

[0038] The reaction unit includes a reactor 13 , a first reaction circulation pump 14 , a first reaction heat exchanger 15 , a second venturi ejector, a second reaction circulation pump 16 , a second reaction heat exchanger 17 and a sprayer, wherein the second venturi ejector and the sprayer are arranged in the reactor 13 .

[0039] In this embodiment, the first input port of the reactor 13 is connected to the output port of the pre-reaction pump 11 through the fourth tube body, the input port of the first reaction circulation pump 14 is connected to the first output port of the reactor 13 through the fifth tube body, the output port of the first reaction circulation pump 14 is connected to the first input port of the first reaction heat exchanger 15 through the sixth tube body, the first output port of the first reaction heat exchanger 15 is connected to the top of the reactor 13 through the seventh tube body, and the seventh tube body is connected to the second venturi ejector. It should be understood that the reactor 13, the first reaction circulation pump 14, the first reaction heat exchanger 15 and the second venturi ejector of this embodiment form an injection process loop, and the second venturi ejector, driven by the first reaction circulation pump 14, forms a strong turbulent mass transfer with the material, ethylene oxide and propylene oxide at the inner cavity of the second venturi ejector, realizes rapid mixing, dispersion and reaction, and can realize about 90% of the reaction of ethylene oxide and propylene oxide at one time.

[0040] At the same time, the negative pressure port of the second venturi ejector is connected to the upper space of the reactor 13 through the second connecting pipe and the ethylene oxide, propylene oxide and nitrogen suction cavity, and forms a strong turbulent mass transfer at the throat with the high-speed flowing material and the externally continuously fed ethylene oxide and propylene oxide, so as to achieve rapid mixing, dispersion and reaction, and achieve about 90% reaction of ethylene oxide and propylene oxide, with basically no induction period, thereby reducing the generation of by-products.

[0041] In this embodiment, the input port of the second reaction circulation pump 16 is connected to the first output port of the reactor 13 through the eighth tube body, the output port of the second reaction circulation pump 16 is connected to the first input port of the second reaction heat exchanger 17 through the ninth tube body, the first output port of the second reaction heat exchanger 17 is connected to the top of the reactor 13 through the tenth tube body, and the tenth tube body is connected to the sprayer. It should be understood that the reactor 13, the second reaction circulation pump 16, the second reaction heat exchanger 17 and the sprayer of this embodiment form a spray process loop. Under the drive of the second reaction circulation pump 16, the material is dispersed into 100-300 μm fine liquid droplets in the upper space of the reactor 13 through the nozzle of the sprayer, and collides, dissolves and reacts with the ethylene oxide and propylene oxide in the gas phase space. Because the surface area of ​​the small droplets increases geometrically, the reaction rate increases in direct proportion to the surface area.

[0042] It is worth noting that the injection process loop and the spray process loop of this embodiment can be operated separately or in combination. When the dual loops are operated in combination, combined with the pre-reaction unit, a raw material growth ratio of about 70 can be achieved. After the dual loops are operated independently and then in combination, combined with the pre-reaction unit, a raw material growth ratio of about 120 can be achieved.

[0043] The hot water unit is used to increase or decrease the temperature of the hot water, and is connected to the pre-reaction heat exchanger 12, the first reaction heat exchanger 15, and the second reaction heat exchanger 17, and is used to control the temperature of the output water according to the temperature of the pre-reactor 10 and the reactor 13, so as to output hot water of corresponding temperature to the pre-reaction heat exchanger 12, the first reaction heat exchanger 15, and the second reaction heat exchanger 17, so as to keep the pre-reactor 10 and the reactor 13 working at a stable temperature. In other words, the hot water unit can output hot water to exchange heat with the pre-reaction heat exchanger 12, the first reaction heat exchanger 15, and the second reaction heat exchanger 17, so that the pre-reactor 10 and the reactor 13 work at a safe temperature.

[0044] Preferably, the hot water is desalted water, which solves the problems of device corrosion and scaling under nitrogen-sealed conditions and increases the life of the equipment.

[0045] In this embodiment, when the temperature in the pre-reactor 10 is lower than the first preset low temperature value (artificially set temperature), the water transfer unit generates hot water and delivers hot water to the pre-reaction heat exchanger 12 to increase the temperature in the pre-reactor 10. Further, when the temperature in the pre-reactor 10 is higher than the first preset high temperature value (artificially set temperature), the water transfer unit generates cold water and delivers cold water to the pre-reaction heat exchanger 12 to reduce the temperature in the pre-reactor 10.

[0046] In this embodiment, when the temperature in the reactor 13 is lower than the second preset low temperature value (manually set temperature), the water transfer unit generates hot water and delivers hot water to the first reaction heat exchanger 15 and the second reaction heat exchanger 17 to increase the temperature in the reactor 13. Further, when the temperature in the reactor 13 is higher than the second preset high temperature value (manually set temperature), the water transfer unit generates cold water and delivers cold water to the first reaction heat exchanger 15 and the second reaction heat exchanger 17 to reduce the temperature in the reactor 13.

[0047] The heat energy utilization unit is connected to the first reaction heat exchanger 15 and the second reaction heat exchanger 17, and is used to obtain and store the heat energy of the first reaction heat exchanger 15 and the second reaction heat exchanger 17. In other words, the heat energy utilization unit can collect high-temperature heat energy in the first reaction heat exchanger 15 and the second reaction heat exchanger 17 and store the high-temperature heat energy.

[0048] In this embodiment, when the temperature in the reactor 13 is higher than the second preset high temperature value, the heat energy utilization unit is first controlled to be connected with the first reaction heat exchanger 15 and the second reaction heat exchanger 17 (at this time, the temperature in the reactor 13 is relatively high, and the hot water unit is not connected with the first reaction heat exchanger 15 and the second reaction heat exchanger 17), so as to obtain and store the high-temperature heat energy in the first reaction heat exchanger 15 and the second reaction heat exchanger 17 through the high-temperature energy storage medium in the heat energy utilization unit, and when the temperature of the high-temperature energy storage medium in the heat energy utilization unit reaches the preset storage temperature (artificially set temperature), the hot water unit is controlled to be connected with the first reaction heat exchanger 15 and the second reaction heat exchanger 17 (at this time, the heat energy utilization unit is not connected with the first reaction heat exchanger 15 and the second reaction heat exchanger 17), and the hot water unit is controlled to generate cold water to transport cold water to the first reaction heat exchanger 15 and the second reaction heat exchanger 17 to reduce the temperature in the reactor 13.

[0049] In this embodiment, the hot water unit includes a hot water expansion tank 20 containing hot water, a hot water pump 21, a hot water heater 22 and a hot water cooler 23, wherein the output port of the hot water expansion tank 20 is connected to the input port of the hot water pump 21 through a first water pipe 201, the output port of the hot water pump 21 is connected to the first input port of the hot water heater 22 through a second water pipe 202, the output port of the hot water pump 21 is connected to the first input port of the hot water cooler 23 through a third water pipe 203, the first output port of the hot water heater 22 is connected to the second input port of the pre-reaction heat exchanger 12 through a fourth water pipe 204, and the second output port of the pre-reaction heat exchanger 12 is connected to the second input port of the pre-reaction heat exchanger 12 through a fifth water pipe 206. 205 is connected to the input port of the heat conduction water pump 21, the first output port of the heat conduction water heater 22 is connected to the second input port of the first reaction heat exchanger 15 through the sixth water pipe 206, the second output port of the first reaction heat exchanger 15 is connected to the input port of the heat conduction water pump 21 through the seventh water pipe 207, the first output port of the heat conduction water heater 22 is connected to the second input port of the second reaction heat exchanger 17 through the eighth water pipe 208, and the second output port of the second reaction heat exchanger 17 is connected to the input port of the heat conduction water pump 21 through the ninth water pipe 209, so that the hot water generated by the heat conduction water heater 22 can be transported to the pre-reaction heat exchanger 12, the first reaction heat exchanger 15 and the second reaction heat exchanger 17.

[0050] Furthermore, the first output port of the water conductive water cooler 23 is connected to the second input port of the pre-reaction heat exchanger 12 through the tenth water pipe, the first output port of the water conductive water cooler 23 is connected to the second input port of the first reaction heat exchanger 15 through the eleventh water pipe, and the first output port of the water conductive water cooler 23 is connected to the second input port of the second reaction heat exchanger 17 through the twelfth water pipe 212, so that the cold water generated by the water conductive water cooler 23 can be transported to the pre-reaction heat exchanger 12, the first reaction heat exchanger 15 and the second reaction heat exchanger 17 to cool the pre-reactor 10 and the reactor 13.

[0051] Preferably, the first water pipe 201, the second water pipe 202, the third water pipe 203, the fourth water pipe 204, the fifth water pipe 205, the sixth water pipe 206, the seventh water pipe 207, the eighth water pipe 208, the ninth water pipe 209, the tenth water pipe 210, the eleventh water pipe 211 and the twelfth water pipe 212 are all provided with control valves so that the on and off of the control valves can be flexibly controlled as needed.

[0052] In this embodiment, the heat energy utilization unit includes a heat energy storage tank 30 for storing high-temperature energy storage medium, a heat energy pump 31, a primary heat source user 32 and a secondary heat source user 33, wherein the output port of the heat energy storage tank 30 is connected to the input port of the heat energy pump 31 through a first insulation pipe 301, the output port of the heat energy pump 31 is connected to the third input port of the first reaction heat exchanger 15 through a second insulation pipe 302, the third output port of the first reaction heat exchanger 15 is connected to the input port of the primary heat source user 32 through a third insulation pipe 303, the output port of the heat energy pump 31 is connected to the third input port of the second reaction heat exchanger 17 through a fourth insulation pipe 304, the third output port of the second reaction heat exchanger 17 is connected to the input port of the primary heat source user 32 through a fifth insulation pipe 305, the output port of the primary heat source user 32 is connected to the input port of the secondary heat source user 33 through a sixth insulation pipe 306, and the output port of the secondary heat source user 33 is connected to the input port of the heat energy storage tank 30 through a seventh insulation pipe 307.

[0053] It is worth noting that the first input port of the first reaction heat exchanger 15 of the present embodiment is connected to the first output port of the first reaction heat exchanger 15, the second input port of the first reaction heat exchanger 15 is connected to the second output port of the first reaction heat exchanger 15, the third input port of the first reaction heat exchanger 15 is connected to the third output port of the first reaction heat exchanger 15, while the first input port, the second input port and the third input port of the first reaction heat exchanger 15 are not connected, and the first output port, the second output port and the third output port of the first reaction heat exchanger 15 are not connected. The first input port of the second reaction heat exchanger 17 is connected to the first output port of the second reaction heat exchanger 17, the second input port of the second reaction heat exchanger 17 is connected to the second output port of the second reaction heat exchanger 17, the third input port of the second reaction heat exchanger 17 is connected to the third output port of the second reaction heat exchanger 17, while the first input port, the second input port and the third input port of the second reaction heat exchanger 17 are not connected, and the first output port, the second output port and the third output port of the second reaction heat exchanger 17 are not connected.

[0054] Preferably, the first insulation tube 301 , the second insulation tube 302 , the third insulation tube 303 , the fourth insulation tube 304 , the fifth insulation tube 305 , the sixth insulation tube 306 and the seventh insulation tube 307 are all provided with electric valves so that the on and off of the electric valves can be flexibly controlled as needed.

[0055] In this embodiment, the temperature required by the first-level heat source user 32 is higher than the temperature required by the second-level heat source user 33. Preferably, the first-level heat source user 32 includes equipment for materials that require temperature increase, a thermal energy power generation system, steam production equipment, and thermal energy-generated low-temperature cold water equipment, while the second-level heat source user 33 includes heating equipment, low-temperature material production equipment, and thermal energy-generated medium-temperature cold water equipment.

[0056] Further, such as Figure 5 As shown, in some embodiments, the primary heat source user 32 includes a first circulation pump 321 , a first delivery pipe 322 , a second delivery pipe 323 , a second circulation pump 324 , a third delivery pipe 325 and a fourth delivery pipe 326 .

[0057] The first circulation pump 321 is arranged in the first delivery pipe 322, one end of the first delivery pipe 322 is connected to the output port of the thermal energy storage tank 30, the other end of the first delivery pipe 322 is connected to the second input port of the pre-reaction heat exchanger 12, the second output port of the pre-reaction heat exchanger 12 is connected to one end of the second delivery pipe 323, and the other end of the second delivery pipe 323 is connected to the input port of the thermal energy storage tank 30, so that the high-temperature energy storage medium in the thermal energy storage tank 30 can be pumped into the pre-reaction heat exchanger 12 for heat exchange through the first circulation pump 321, so as to heat up the pre-reactor 10. It should be understood that the primary heat source user 32 at this time includes the pre-reaction heat exchanger 12.

[0058] The second circulation pump 324 is arranged in the third delivery pipe 325, one end of the third delivery pipe 325 is connected to the output port of the thermal energy storage tank 30, the other end of the third delivery pipe 325 is connected to the second input port of the first reaction heat exchanger 15 and / or the second reaction heat exchanger 17, the second output port of the first reaction heat exchanger 15 and / or the second reaction heat exchanger 17 is connected to one end of the fourth delivery pipe 326, the other end of the fourth delivery pipe 326 is connected to the input port of the thermal energy storage tank 30, so that the high-temperature energy storage medium in the thermal energy storage tank 30 can be pumped to the first reaction heat exchanger 15 and / or the second reaction heat exchanger 17 for heat exchange through the second circulation pump 324, so as to heat up the reactor 13. It should be understood that the primary heat source user 32 at this time includes the first reaction heat exchanger 15 and / or the second reaction heat exchanger 17.

[0059] That is to say, the present invention can recover the heat energy in the reactor 13 and redistribute it to the pre-reactor 10 and the reactor 13, thereby effectively saving energy.

[0060] Preferably, when the temperature inside the pre-reactor 10 is lower than the first preset low temperature value, the first circulation pump 321 is controlled to work to transport the high-temperature energy storage medium in the thermal energy storage tank 30 to the pre-reaction heat exchanger 12 to increase the temperature inside the pre-reactor 10.

[0061] Preferably, when the temperature inside the reactor 13 is lower than the second preset low temperature value, the second circulation pump 324 is controlled to work to transport the high-temperature energy storage medium in the thermal energy storage tank 30 to the first reaction heat exchanger 15 and / or the second reaction heat exchanger 17, so as to transport the high-temperature energy storage medium to the first reaction heat exchanger 15 and / or the second reaction heat exchanger 17 to increase the temperature inside the reactor 13.

[0062] Further, in some special embodiments, when it is detected that the temperature of the high-temperature energy storage medium in the thermal energy storage tank 30 is lower than the temperature in the pre-reactor 10 and the temperature in the pre-reactor 10 is lower than the first preset low temperature value, the first circulation pump 321 is controlled to stop working, and the water heater 22 is controlled to work, so as to transport hot water to the pre-reaction heat exchanger 13 through the water heater 22, so as to continue to increase the temperature in the pre-reactor 10 to reach the pre-reaction temperature. In other words, when the heat energy of the thermal energy storage tank 30 can no longer increase the temperature in the pre-reactor 10, the water heater 22 will be switched to increase the temperature of the pre-reactor 10.

[0063] Further, when it is detected that the temperature of the high-temperature energy storage medium in the thermal energy storage tank 30 is lower than the temperature in the reactor 13 and the temperature in the reactor 13 is lower than the second preset low temperature value, the second circulation pump 324 is controlled to stop working, and the water heater 22 is controlled to work, so as to transport hot water to the first reaction heat exchanger 15 and / or the second reaction heat exchanger 17 through the water heater 22 to continue to increase the temperature in the reactor 13. In other words, when the heat energy of the thermal energy storage tank 30 cannot continue to increase the temperature in the reactor 13, the water heater 22 will be switched to increase the temperature of the reactor 13.

[0064] Furthermore, the thermal energy storage tank 30 is provided with a first thermal energy storage tank and a second thermal energy storage tank, and the second output ports of the first reaction heat exchanger 15 and the second reaction heat exchanger 17 are connected with an eighth insulation pipe, and the eighth insulation pipe is connected to the first thermal energy storage tank so that the high-temperature energy storage medium after heat exchange is transported to the first thermal energy storage tank, and the seventh insulation pipe 307 is connected to the second thermal energy storage tank so that the high-temperature energy storage medium with a relatively low temperature output from the secondary heat source user 33 is transported to the second thermal energy storage tank. Preferably, when the temperature in the pre-reactor 10 is lower than the first preset low temperature value, the first circulation pump 321 is controlled to operate to transport the high-temperature energy storage medium in the second thermal energy storage tank to the pre-reaction heat exchanger 12 to increase the temperature in the pre-reactor 10; when the temperature in the reactor 13 is lower than the second preset low temperature value, the second circulation pump 324 is controlled to operate to transport the high-temperature energy storage medium in the first thermal energy storage tank to the first reaction heat exchanger 15 and / or the second reaction heat exchanger 17 to transport the high-temperature energy storage medium to the first reaction heat exchanger 15 and / or the second reaction heat exchanger 17 to increase the temperature in the reactor 13.

[0065] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An intrinsically safe and low energy consumption ethylene propoxylation loop reaction device, characterized in that: include: A pre-reaction unit, comprising a pre-reactor for receiving raw materials and catalysts, a pre-reaction pump, a pre-reaction heat exchanger and a first venturi ejector, wherein the first venturi ejector is arranged in the pre-reactor, the output port of the pre-reactor is connected to the input port of the pre-reaction pump through a first pipe body, the output port of the pre-reaction pump is connected to the first input port of the pre-reaction heat exchanger through a second pipe body, the first output port of the pre-reaction heat exchanger is connected to the top of the pre-reactor through a third pipe body, and the third pipe body is connected to the first venturi ejector; A reaction unit, comprising a reactor, a first reaction circulation pump, a first reaction heat exchanger, a second venturi ejector, a second reaction circulation pump, a second reaction heat exchanger and a sprayer, wherein the second venturi ejector and the sprayer are arranged in the reactor, the first input port of the reactor is connected to the output port of the pre-reaction pump through a fourth pipe body, the input port of the first reaction circulation pump is connected to the first output port of the reactor through a fifth pipe body, the output port of the first reaction circulation pump is connected to the first input port of the first reaction heat exchanger through a sixth pipe body, the first output port of the first reaction heat exchanger is connected to the top of the reactor through a seventh pipe body, and the seventh pipe body is connected to the second venturi ejector, the input port of the second reaction circulation pump is connected to the first output port of the reactor through an eighth pipe body, the output port of the second reaction circulation pump is connected to the first input port of the second reaction heat exchanger through a ninth pipe body, the first output port of the second reaction heat exchanger is connected to the top of the reactor through a tenth pipe body, and the tenth pipe body is connected to the sprayer; a water conduction unit, used for heating or cooling the water conduction unit, connected to the pre-reaction heat exchanger, the first reaction heat exchanger and the second reaction heat exchanger, and used for controlling the temperature of the output water according to the temperature of the pre-reaction heat exchanger and the reactor, so as to output water conduction units of corresponding temperature to the pre-reaction heat exchanger, the first reaction heat exchanger and the second reaction heat exchanger, so as to keep the pre-reaction heat exchanger and the reactor working in a stable temperature state; a heat energy utilization unit connected to the first reaction heat exchanger and the second reaction heat exchanger, and used to obtain and store heat energy of the first reaction heat exchanger and the second reaction heat exchanger; The heat energy utilization unit includes a heat energy storage tank for storing high-temperature energy storage medium, a heat energy pump, a primary heat source user and a secondary heat source user, wherein the output port of the heat energy storage tank is connected to the input port of the heat energy pump through a first insulation pipe, the output port of the heat energy pump is connected to the third input port of the first reaction heat exchanger through a second insulation pipe, the third output port of the first reaction heat exchanger is connected to the input port of the primary heat source user through a third insulation pipe, the output port of the heat energy pump is connected to the third input port of the second reaction heat exchanger through a fourth insulation pipe, the third output port of the second reaction heat exchanger is connected to the input port of the primary heat source user through a fifth insulation pipe, the output port of the primary heat source user is connected to the input port of the secondary heat source user through a sixth insulation pipe, and the output port of the secondary heat source user is connected to the input port of the heat energy storage tank through a seventh insulation pipe; The temperature required by the first-level heat source users is higher than the temperature required by the second-level heat source users. The first-level heat source users include equipment for materials that need to be heated, thermal power generation systems, steam-producing equipment, and thermal energy-generated low-temperature cold water equipment. The second-level heat source users include heating equipment, low-temperature material production equipment, and thermal energy-generated medium-temperature cold water equipment.

2. The intrinsically safe and low energy consumption ethylene propoxylation loop reaction device according to claim 1, characterized in that: The water conduction unit includes a water conduction expansion tank containing water conduction, a water conduction pump, a water conduction heater and a water conduction cooler, wherein the water conduction is desalted water, the output port of the water conduction expansion tank is connected to the input port of the water conduction pump through a first water pipe, the output port of the water conduction pump is connected to the first input port of the water conduction heater through a second water pipe, the output port of the water conduction pump is connected to the first input port of the water conduction cooler through a third water pipe, the first output port of the water conduction heater is connected to the second input port of the pre-reaction heat exchanger through a fourth water pipe, the second output port of the pre-reaction heat exchanger is connected to the input port of the water conduction pump through a fifth water pipe, the first output port of the water conduction heater is connected to the second input port of the first reaction heat exchanger through a sixth water pipe, the second output port of the first reaction heat exchanger is connected to the input port of the water conduction pump through a seventh water pipe, the first output port of the water conduction heater is connected to the second input port of the second reaction heat exchanger through an eighth water pipe, and the second output port of the second reaction heat exchanger is connected to the input port of the water conduction pump through a ninth water pipe; The first output port of the water conduction cooler is connected to the second input port of the pre-reaction heat exchanger through a tenth water pipe, the first output port of the water conduction cooler is connected to the second input port of the first reaction heat exchanger through an eleventh water pipe, and the first output port of the water conduction cooler is connected to the second input port of the second reaction heat exchanger through a twelfth water pipe; Among them, the first water pipe, the second water pipe, the third water pipe, the fourth water pipe, the fifth water pipe, the sixth water pipe, the seventh water pipe, the eighth water pipe, the ninth water pipe, the tenth water pipe, the eleventh water pipe and the twelfth water pipe are all provided with control valves.

3. The method for using the intrinsically safe and low energy consumption ethylene propoxylation loop reaction device according to claim 1 is characterized in that: include: When the temperature in the pre-reactor is lower than a first preset low temperature value, the water transfer unit generates hot water and delivers hot water to the pre-reaction heat exchanger to increase the temperature in the pre-reactor; when the temperature in the pre-reactor is higher than a first preset high temperature value, the water transfer unit generates cold water and delivers cold water to the pre-reaction heat exchanger to reduce the temperature in the pre-reactor; When the temperature in the reactor is lower than a second preset low temperature value, the water transfer unit generates hot water and delivers hot water to the first reaction heat exchanger and the second reaction heat exchanger to increase the temperature in the reactor; when the temperature in the reactor is higher than a second preset high temperature value, the water transfer unit generates cold water and delivers cold water to the first reaction heat exchanger and the second reaction heat exchanger to reduce the temperature in the reactor; When the temperature in the reactor is higher than a second preset high temperature value, the heat energy utilization unit is first controlled to be connected with the first reaction heat exchanger and the second reaction heat exchanger, so as to obtain and store the high-temperature heat energy in the first reaction heat exchanger and the second reaction heat exchanger through the high-temperature energy storage medium in the heat energy utilization unit. When the temperature of the high-temperature energy storage medium in the heat energy utilization unit reaches the preset storage temperature, the water conduction unit is controlled to be connected with the first reaction heat exchanger and the second reaction heat exchanger, and the water conduction unit is controlled to generate cold water to transport cold water to the first reaction heat exchanger and the second reaction heat exchanger to reduce the temperature in the reactor.

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