A dual-circulation heat transfer oil energy-saving device and method for interchangeable high and low temperature heat sources

Abstract

This invention discloses an energy-saving device and method for dual-circulation high and low temperature heat source interchangeability of heat transfer oil, including a heat exchange medium storage mechanism, a first heat exchanger, and a second heat exchanger. The first heat exchanger is circulatedly connected to a first heat exchange pipeline, and a first circulation pump is installed on the first heat exchange pipeline. The second heat exchanger is circulatedly connected to a second heat exchange pipeline, and a second circulation pump is installed on the second heat exchange pipeline. Both the first and second heat exchange pipelines are circulatedly connected to the heat exchange medium storage mechanism, which is equipped with a heating mechanism for heating the heat exchange medium. The heat released during the reaction in the ethoxylation reactor is recovered, stored in the heat exchange medium storage mechanism, and applied to the distillation process in the distillation column to provide heat energy. During the distillation interval, the residual heat of the heat exchange medium in the heat exchange medium storage mechanism is used to heat and dehydrate the initiator in the early stage of the ethoxylation reactor, so as to make full use of the reaction heat and save energy consumption.

Description

Technical Field

[0001] This invention relates to the field of energy-saving equipment technology, and in particular to an energy-saving device and method for dual-circulation heat transfer oil with interchangeable high and low temperature heat sources. Background Technology

[0002] In existing technologies, the mechanism of heat balance in ethoxylation reactions is as follows: the nucleophilic addition reactions of ethylene oxide with compounds such as fatty alcohols, fatty acids, alkylphenols, fatty amines, and alkylamides are collectively referred to as ethoxylation reactions. It is a very vigorous exothermic chemical reaction with considerable danger. Therefore, in industrial production, strict control of the reaction intensity is essential, along with effective heat removal measures. The reaction mechanism is as follows: A) Ethoxylation of alcohol ethers: ROH + nCH2CH2O → RO(CH2CH2O)nH + Q; B) Ethoxylation of alkylphenol ethers: RC2H4OH + nCH2CH2O → RC2H4O(CH2CH2O)nH + Q. This reaction mechanism dictates that the heat energy utilization of the entire reaction process is divided into two aspects: on the one hand, energy storage and cooling are required; on the other hand, heat energy input is needed during the heating and dehydration stage. The ethoxylation reaction process involves: the initiator is pumped into the reactor, circulated, and heated to 100-120 degrees Celsius for dehydration; ethylene oxide is added dropwise to react and release heat; the reaction temperature is controlled by cooling during this process, followed by ripening and neutralization cooling. The heat balance mechanism of the intermittent distillation system involves adding the distillate to the distillation column reboiler and heating it with pre-stored heat transfer oil. Simultaneously, the system is evacuated, and the high-temperature heat transfer oil is circulated to heat the distillate in a jacketed or internal coil. The high-temperature heat transfer oil is heated by a circulating furnace. When the material reaches a certain temperature, the reflux ratio is adjusted, and various fractions are collected. As low-boiling fractions are collected, the material temperature continues to rise, requiring the heat transfer oil temperature to be further increased to approximately 220 degrees Celsius.

[0003] However, the traditional intermittent distillation system and the high / low temperature heat source usage for ethoxylation reactions are as follows: the heating and cooling of the traditional distillation system and the heat recovery of the ethoxylation reaction are two separate systems. Generally, heat is not used interchangeably. In the intermittent distillation system, after the heat transfer oil is heated and a batch of material is distilled, the heat transfer oil system is paused, and the heat transfer oil slowly cools to room temperature. When distillation is restarted, it is electrically heated again, resulting in a significant waste of heat. The ethoxylation reaction is generally cooled by cooling water, and heating is provided when needed using a heat source (steam or heat transfer oil). There is no energy storage device for the heat transfer oil, nor is there a device for interchangeable high / low temperature heat sources to fully utilize the heat. In other words, the traditional system does not fully utilize the interchangeable use of high and low temperature heat sources. Summary of the Invention

[0004] The purpose of this invention is to provide an energy-saving device and method for dual-circulation high and low temperature heat source interchangeability of heat transfer oil, in order to solve the problems existing in the prior art. The heat released during the reaction in the ethoxylation reactor is recovered, stored in a heat exchange medium storage mechanism, and applied to the distillation process in the distillation column to provide heat energy. During the distillation interval, the residual temperature of the heat exchange medium in the heat exchange medium storage mechanism is used to heat and dehydrate the initiator in the early stage of the ethoxylation reactor, so as to make full use of the heat of reaction and save energy consumption.

[0005] To achieve the above objectives, the present invention provides the following solution: The present invention provides an energy-saving device for dual-circulation high and low temperature heat sources of heat transfer oil, including a heat exchange medium storage mechanism, a first heat exchanger and a second heat exchanger that exchange heat with an ethoxylation reactor and a distillation column bottom, respectively. The first heat exchanger is circulatedly connected to a first heat exchange pipeline, and a first circulation pump is provided on the first heat exchange pipeline. The second heat exchanger is circulatedly connected to a second heat exchange pipeline, and a second circulation pump is provided on the second heat exchange pipeline. Both the first heat exchange pipeline and the second heat exchange pipeline are circulatedly connected to the heat exchange medium storage mechanism, and the heat exchange medium storage mechanism is provided with a heating mechanism for heating the heat exchange medium.

[0006] Preferably, the heat exchange medium storage mechanism includes a low-temperature storage tank and a high-temperature storage tank that are respectively circulated and connected to the first heat exchange pipeline and the second heat exchange pipeline. A balance pipeline is provided between the bottom of the low-temperature storage tank and the high-temperature storage tank. A balance valve is provided on the balance pipeline. The heating mechanism is disposed on the high-temperature storage tank.

[0007] Preferably, the heating mechanism includes a heating sleeve surrounding the outer periphery of the bottom of the high-temperature storage tank, and the heating sleeve is provided with a far-infrared heater spaced apart from the high-temperature storage tank.

[0008] Preferably, a bypass pipeline connected to the low-temperature storage tank is provided between the high-temperature storage tank and the second circulation pump, and the bypass pipeline is provided with a bypass valve and a bypass pump.

[0009] Preferably, an overflow pipeline connects the low-temperature storage tank and the high-temperature storage tank, and an overflow valve is provided on the overflow pipeline. The low-temperature storage tank and the high-temperature storage tank are respectively provided with overflow ports connected to the overflow pipeline, and the two overflow ports are respectively located above the ports of the corresponding balance pipelines.

[0010] Preferably, the volume of the cryogenic storage tank located below its overflow port is 4 / 5 of its total volume, and the overflow port on the high-temperature storage tank is not higher than the overflow port on the cryogenic storage tank.

[0011] Preferably, a plurality of first heat exchange branches are connected in parallel on the first heat exchange pipeline, and each of the first heat exchange branches is equipped with an ethoxylation reactor and is connected to the first heat exchanger of each of the ethoxylation reactors. Each of the first heat exchangers is provided with a first connecting valve at its inlet end.

[0012] Preferably, a number of second heat exchange branches are connected in parallel on the second heat exchange pipeline, and each second heat exchange branch is equipped with a distillation column reboiler and is connected to the second heat exchanger of each distillation column reboiler. Each second heat exchanger is provided with a second connecting valve at its inlet end.

[0013] Preferably, the low-temperature storage tank and the high-temperature storage tank have the same volume, and the volume of the low-temperature storage tank is four times the sum of the volumes of each of the first heat exchange branches and each of the first heat exchangers, and the volume of the high-temperature storage tank is four times the sum of the volumes of each of the second heat exchange branches and each of the second heat exchangers.

[0014] A method for energy saving in a dual-circulation heat transfer oil system that uses both high and low temperature heat sources is also provided, characterized by the following steps:

[0015] Heating and dehydration: The first heat exchange branch is in the normally open state. The first circulating pump and the first connecting valve of the corresponding first heat exchanger are opened to circulate the stored heat exchange medium. The initiator circulation pipeline is connected to the ethoxylation reactor. By circulating the initiator, it exchanges heat with the first heat exchanger, so that the initiator is heated to 100°C to 120°C to complete the heating and dehydration.

[0016] Ethylene oxide dropwise reaction stage: Ethylene oxide is dropwise added into the ethoxylation reactor. The reaction releases a large amount of heat and the heat is exchanged with the heat exchange medium through the first heat exchanger. After the reaction is completed, all the first connecting valves are closed.

[0017] Distillation stage: Open the balance valve to bypass the heat exchange medium in the low temperature storage tank to the high temperature storage tank, close the balance valve, open the second circulation pump to connect the second heat exchange branch, circulate the heat exchange medium and heat the material in the distillation column bottom, and turn on the far-infrared heater to heat the heat exchange medium in the high temperature storage tank to the required temperature;

[0018] Distillation discharge: After distillation is completed, the far-infrared heater is stopped, the bypass pump is turned on, and the heat exchange medium is returned to the low-temperature storage tank.

[0019] The present invention achieves the following technical effects compared to the prior art:

[0020] First, a first heat exchanger is circulated through a first heat exchange pipeline, on which a first circulation pump is installed. A second heat exchanger is circulated through a second heat exchange pipeline, on which a second circulation pump is installed. Both the first and second heat exchange pipelines are circulated to a heat exchange medium storage mechanism. The first heat exchanger exchanges the heat generated during the reaction in the ethoxylation reactor to the heat exchange medium in the first heat exchange pipeline. The heat exchange medium is then collected in the heat exchange medium storage mechanism. Subsequently, when the distillation column reboiler requires heat during the distillation process, the second heat exchange pipeline is opened to release the heat exchange medium. The heat exchange medium in the storage mechanism is connected to the second heat exchange pipeline and provides corresponding heat to the distillation column reboiler through the second heat exchanger to assist the distillation column reboiler in completing the distillation work. This fully utilizes the heat generated during the reaction in the ethoxylation reactor. Furthermore, when the initiator in the ethoxylation reactor needs to be dehydrated, the distillation gap in the distillation column reboiler is used to open the second heat exchange pipeline and connect the heat exchange medium in the storage mechanism to the first heat exchange pipeline. The initiator in the ethoxylation reactor is then preheated and dehydrated through the first heat exchanger, thus significantly reducing energy consumption.

[0021] Second, the heat exchange medium storage mechanism includes a low-temperature storage tank and a high-temperature storage tank, which are respectively circulated and connected to the first and second heat exchange pipelines. A balance pipeline is provided between the bottoms of the low-temperature and high-temperature storage tanks, and a balance valve is installed on the balance pipeline. The heating mechanism is installed on the high-temperature storage tank. The heat exchange medium after heat exchange through the first heat exchange pipeline is stored in the low-temperature storage tank. Through the connection between the high-temperature storage tank and the second heat exchange pipeline, the heat exchange medium in the high-temperature storage tank is conducted to the second heat exchange pipeline to exchange heat with the distillation column reboiler. The balance pipeline connects the high-temperature storage tank and the low-temperature storage tank... The storage tank is open to allow the flow of the heat exchange medium, which is then transferred from the low-temperature storage tank to the high-temperature storage tank after heat exchange with the ethoxylation reactor. Furthermore, if the temperature of the heat exchange medium after heat exchange with the ethoxylation reactor is insufficient, the high-temperature storage tank is heated by a heating mechanism until the distillation temperature of the distillation column bottom is met. The heating mechanism is only installed in the high-temperature storage tank, so only the heat exchange medium in the high-temperature storage tank needs to be heated, which can meet the heat exchange medium requirements of the distillation column bottom without the need to heat all the heat exchange medium simultaneously, thus reducing heat loss.

[0022] Third, the heating mechanism includes a heating jacket surrounding the bottom of the high-temperature storage tank. The heating jacket is equipped with far-infrared heaters spaced apart from the high-temperature storage tank. The heat exchange medium inside the high-temperature storage tank is heated by the far-infrared heaters, resulting in uniform heating, high heat utilization, and full assurance of safety during the heating process.

[0023] Fourth, a bypass pipeline connecting the high-temperature storage tank and the second circulation pump to the low-temperature storage tank is provided. The bypass pipeline is equipped with a bypass valve and a bypass pump to conduct the heat exchange medium from the high-temperature storage tank to the low-temperature storage tank. Specifically, when the high-temperature storage tank is not in use, the oil is poured into the low-temperature storage tank, thereby ensuring that the heat exchange medium can fully react with the ethoxy reactor and that the storage capacity is sufficient. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Among them, 1-distillation column reboiler, 2-second heat exchanger, 3-second heat exchange pipeline, 4-second circulation pump, 5-high temperature storage tank, 6-far-infrared heater, 7-low temperature storage tank, 8-overflow pipeline, 9-balance pipeline, 10-first heat exchange pipeline, 11-first circulation pump, 12-ethoxylation reactor. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] The purpose of this invention is to provide an energy-saving device and method for dual-circulation high and low temperature heat source interchangeability of heat transfer oil, in order to solve the problems existing in the prior art. The heat released during the reaction in the ethoxylation reactor is recovered, stored in a heat exchange medium storage mechanism, and applied to the distillation process in the distillation column to provide heat energy. During the distillation interval, the residual temperature of the heat exchange medium in the heat exchange medium storage mechanism is used to heat and dehydrate the initiator in the early stage of the ethoxylation reactor, so as to make full use of the heat of reaction and save energy consumption.

[0029] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1As shown, this embodiment provides an energy-saving device for dual-circulation high and low temperature heat sources of heat transfer oil, including a heat exchange medium storage mechanism, a first heat exchanger and a second heat exchanger 2 that exchange heat with the ethoxylation reactor 12 and the distillation column reboiler 1 respectively. The first heat exchanger is circulatedly connected to a first heat exchange pipeline 10, and a first circulation pump 11 is provided on the first heat exchange pipeline 10. The second heat exchanger 2 is circulatedly connected to a second heat exchange pipeline, and a second circulation pump 4 is provided on the second heat exchange pipeline. Both the first heat exchange pipeline 10 and the second heat exchange pipeline are circulatedly connected to the heat exchange medium storage mechanism. The heat exchange medium storage mechanism contains a heat exchange medium, preferably heat transfer oil, etc., and the heat exchange medium storage mechanism is provided with a heating mechanism for heating the heat exchange medium. The first heat exchanger is circulated through a first heat exchange pipeline 10, which is equipped with a first circulation pump 11. The second heat exchanger 2 is circulated through a second heat exchange pipeline, which is equipped with a second circulation pump 4. Both the first and second heat exchange pipelines are circulated through a heat exchange medium storage mechanism. The first heat exchanger exchanges the heat generated during the reaction in the ethoxylation reactor 12 to the heat exchange medium in the first heat exchange pipeline 10. The heat exchange medium is then collected in the heat exchange medium storage mechanism. Subsequently, when the distillation column reboiler 1 requires heat during the distillation process, the second heat exchange pipeline 3 is opened to release the heat exchange medium. The heat exchange medium in the storage mechanism is connected to the second heat exchange pipeline 3, and provides corresponding heat to the distillation column reboiler 1 through the second heat exchanger 2 to assist the distillation column reboiler 1 in completing the distillation work, making full use of the heat generated during the reaction in the ethoxylation reactor 12. Furthermore, when the initiator in the ethoxylation reactor 12 needs to be dehydrated, the distillation gap of the distillation column reboiler 1 is used to open the second heat exchange pipeline, and the heat exchange medium in the heat exchange medium storage mechanism is connected to the first heat exchange pipeline 10, and the initiator in the ethoxylation reactor 12 is preheated and dehydrated through the first heat exchanger, which greatly reduces energy consumption.

[0031] Specifically, the ethoxylation reactor 12 is connected to an external circulation pipeline to conduct the catalyst and dehydrated initiator to the external circulation pipeline, and spray them out through a nozzle inside the ethoxylation reactor 12 to react with the ethylene oxide introduced into the ethoxylation reactor 12. Subsequently, during the continuous operation of the external circulation pipeline, the reaction products also enter the external circulation pipeline. Since a large amount of heat is generated during the reaction, a first heat exchanger is set on the external circulation pipeline to dissipate the generated heat. The preferred first heat exchanger is a swirl plate heat exchanger, which makes heat exchange contact with the first heat exchange pipeline 10 to fully exchange heat with the heat exchange medium in the first heat exchange pipeline 10 and store the heat exchange medium in the heat exchange medium storage mechanism. The temperature of the ethoxylation reaction is generally around 150-180 degrees Celsius, so the temperature of the corresponding heat exchange medium is also around 150 degrees Celsius.

[0032] Further, the heat exchange medium storage mechanism includes a low-temperature storage tank 7 and a high-temperature storage tank 5 that are respectively in circular communication with the first heat exchange pipeline 10 and the second heat exchange pipeline. A balance pipeline 9 is provided between the bottoms of the low-temperature storage tank 7 and the high-temperature storage tank 5. A balance valve is provided on the balance pipeline 9. The balance valve is opened to balance the liquid levels of the heat exchange medium in the low-temperature storage tank 7 and the high-temperature storage tank 5. The heating mechanism is provided on the high-temperature storage tank 5. Then, the heat exchange medium after heat exchange through the first heat exchange pipeline 10 is stored in the low-temperature storage tank 7. Through the connection between the high-temperature storage tank 5 and the second heat exchange pipeline, the heat exchange medium in the high-temperature storage tank 5 is conducted to the second heat exchange pipeline, and heat exchange is carried out on the distillation column kettle 1. The high-temperature storage tank 5 and the low-temperature storage tank 7 are conducted through the balance pipeline 9 to realize the flow of the heat exchange medium, so as to conduct the heat exchange medium after heat exchange with the ethoxylation reactor 12 from the low-temperature storage tank 7 to the high-temperature storage tank 5. Further, if the temperature of the heat exchange medium after heat exchange with the ethoxylation reactor 12 is not enough, the high-temperature storage tank 5 is heated by the heating mechanism until the distillation temperature of the distillation column kettle 1 is satisfied. And only the heating mechanism is provided in the high-temperature storage tank 5. Only the heat exchange medium in the high-temperature storage tank 5 needs to be heated, that is, the heat exchange medium demand of the distillation column kettle 1 can be satisfied, and there is no need to synchronously heat all the heat exchange medium, reducing heat loss.

[0033] As a preferred embodiment of the present invention, the heating mechanism includes a heating jacket surrounding the outer peripheral side of the bottom of the high-temperature storage tank 5. A far-infrared heater 6 is provided on the heating jacket at an interval from the high-temperature storage tank 5. The heat exchange medium in the high-temperature storage tank 5 is heated by the far-infrared heater 6. The heating is uniform, the heat utilization rate is high, and the safety of the heating process can be fully guaranteed. The heat exchange medium in the high-temperature storage tank 5 is conducted to the second heat exchanger 2 supporting the distillation column kettle 1 through the second circulation pump 4. The second heat exchanger 2 is an internal coil or jacket in the distillation column kettle 1, and then the material in the distillation column kettle 1 is heated. The required heating temperature is generally about 230 degrees. Since the temperature of the ethoxylation reaction is generally about 150 to 180 degrees, the temperature of the corresponding heat exchange medium is also about 150 degrees. Then, after the heat exchange medium is conducted into the high-temperature storage tank 5, the high-temperature storage tank 5 and the heat exchange medium inside it are heated to about 230 degrees by the far-infrared heater 6.

[0034] Furthermore, a bypass pipeline connecting the high-temperature storage tank 5 and the second circulation pump 4 to the low-temperature storage tank 7 is provided. The bypass pipeline is equipped with a bypass valve and a bypass pump to adjust the storage volume of the heat exchange medium in the high-temperature storage tank 5 and the low-temperature storage tank 7. In actual use, the heat exchange medium is transferred from the high-temperature storage tank 5 to the low-temperature storage tank 7 through the bypass pipeline and bypass pump. Specifically, when the high-temperature storage tank 5 is not in use, the oil is pumped into the low-temperature storage tank 7, thereby ensuring that the heat exchange medium fully reacts with the ethoxy reactor and that the storage volume is sufficient. This utilizes the residual heat of the heat exchange medium after heat exchange with the distillation column reboiler 1, further reducing energy consumption. Preferably, the bypass pump and the second circulation pump 4 share the same pump set; that is, the outlet of the second circulation pump set 4 is connected in parallel to the bypass pipeline and the second heat exchange pipeline 3.

[0035] Furthermore, an overflow pipe 8 connects the cryogenic storage tank 7 and the high-temperature storage tank 5. An overflow valve is installed on the overflow pipe 8. Both the cryogenic storage tank 7 and the high-temperature storage tank 5 have overflow ports connected to the overflow pipe 8. The two overflow ports are respectively located above the ports of their corresponding balance pipes 9. By positioning the overflow pipe 8, the heat exchange medium in the cryogenic storage tank 7 can be bypassed to the high-temperature storage tank 5 after reaching the required level, thereby ensuring that the liquid level of the heat exchange medium in the cryogenic storage tank 7 and the high-temperature storage tank 5 reaches the required level.

[0036] In a preferred embodiment of the present invention, the volume of the low-temperature storage tank 7 located below its overflow port is 4 / 5 of its total volume. The overflow port of the high-temperature storage tank 5 is not higher than the overflow port of the low-temperature storage tank 7. When the distillation column reboiler 1 is not in use and the ethoxylation reaction begins, the heat exchange medium of the high-temperature storage tank 5 can be pumped into the low-temperature storage tank 7, and the amount of heat exchange medium stored in the low-temperature storage tank 7 is kept at 4 / 5 of its total volume, i.e., the highest level, to maximize the storage capacity of heat exchange medium and energy.

[0037] Furthermore, several first heat exchange branches are connected in parallel on the first heat exchange pipeline 10, each first heat exchange branch is equipped with an ethoxylation reactor 12, and each branch is connected to a first heat exchanger of the ethoxylation reactor 12. Each first heat exchanger has a first connecting valve at its inlet. The heat transfer oil in the cryogenic storage tank 7 is circulated to the first heat exchanger of each ethoxylation reactor 12 via the first circulation pump 11, carrying away the reaction heat to the cryogenic storage tank 7 for energy storage. During the pre-reaction heating and dehydration stage of the initiator, the circulation of the heat exchange medium between the cryogenic storage tank 7 and the first heat exchange pipeline 10 heats the ethoxylation reactor 12 and dehydrates the initiator.

[0038] Furthermore, several second heat exchange branches are connected in parallel on the second heat exchange pipeline. Each second heat exchange branch is equipped with a distillation column reboiler 1 and is connected to the second heat exchanger 2 of each distillation column reboiler 1. Each second heat exchanger 2 is equipped with a second connecting valve at its inlet end. Through the connection between each second heat exchange branch and the corresponding second heat exchanger 2 of each distillation column reboiler 1, heat exchange is performed on each distillation column reboiler 1 simultaneously, thereby improving the heating and distillation efficiency of the distillation column reboiler 1.

[0039] In a preferred embodiment of the present invention, the cryogenic storage tank 7 and the high-temperature storage tank 5 have the same volume, and the volume of the cryogenic storage tank 7 is four times the sum of the volumes of each of the first heat exchange branches and each of the first heat exchangers, while the volume of the high-temperature storage tank 5 is four times the sum of the volumes of each of the second heat exchange branches and each of the second heat exchangers 2. To better ensure thermal balance and safety, the amount of heat exchange medium stored in each storage tank is 1 / 2 of the tank's volume.

[0040] A method for energy saving in a dual-circulation heat transfer oil system that uses both high and low temperature heat sources is also provided, characterized by the following steps:

[0041] Heating and dehydration: The first heat exchange branch is in the normally open state. The first circulating pump 11 and the first connecting valve of the corresponding first heat exchanger are opened to circulate the stored heat exchange medium. The initiator circulation pipeline is connected to the ethoxylation reactor 12. By circulating the initiator, it exchanges heat with the first heat exchanger, so that the initiator is heated to 100°C to 120°C to complete the heating and dehydration.

[0042] Ethylene oxide dropwise reaction stage: Ethylene oxide is dropwise added into ethoxylation reactor 12. The reaction releases a large amount of heat and the heat is exchanged with the heat exchange medium through the first heat exchanger. After the reaction is completed, all first connecting valves are closed.

[0043] Distillation stage: Open the balance valve to bypass the heat exchange medium in the low-temperature storage tank 7 to the high-temperature storage tank 5, close the balance valve, open the second circulation pump 4 to connect the second heat exchange branch, circulate the heat exchange medium and heat the material in the distillation column bottom 1, and turn on the far-infrared heater 6 to heat the heat exchange medium in the high-temperature storage tank 5 to the required temperature; preferably, the temperature of the far-infrared heater 6 is generally set to about 220 degrees, and a temperature sensor electrically connected to the far-infrared heater 6 is provided in the high-temperature storage tank 5; specifically, when continuously distilling the second batch of distilled material, the material in the distillation column bottom 1 can be heated by the energy stored in the heat exchange medium of the previous batch of far-infrared heating, and the far-infrared heater 6 can be turned on again if necessary, and the temperature of the heat exchange medium can be set as needed;

[0044] Distillation discharge: After distillation is complete, stop the far-infrared heater 6, start the bypass pump, and return the heat exchange medium to the cryogenic storage tank 7. The heat can be used to heat the materials undergoing the ethoxylation reaction, ensuring full utilization of the heat.

[0045] Any adaptive changes made according to actual needs are within the scope of protection of this invention.

[0046] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0047] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A heat-conducting oil double-circulation high-low temperature heat source mutual use energy-saving device, characterized in that, The heat exchange medium storage mechanism, the first heat exchanger and the second heat exchanger which are respectively used for heat exchange with the ethoxylation reactor and the distillation column kettle, the first heat exchanger is circularly communicated with the first heat exchange pipeline, the first circulating pump is arranged on the first heat exchange pipeline, the second heat exchanger is circularly communicated with the second heat exchange pipeline, the second circulating pump is arranged on the second heat exchange pipeline, the first heat exchange pipeline and the second heat exchange pipeline are circularly communicated with the heat exchange medium storage mechanism, and the heat exchange medium storage mechanism is provided with the heating mechanism which is used for heating the heat exchange medium; The heat exchange medium storage mechanism comprises low-temperature storage tanks and high-temperature storage tanks which are circularly communicated with the first heat exchange pipeline and the second heat exchange pipeline respectively, a balance pipeline is arranged between the bottoms of the low-temperature storage tanks and the high-temperature storage tanks, the balance pipeline is provided with a balance valve, and the heating mechanism is arranged on the high-temperature storage tank; The low-temperature storage tank and the high-temperature storage tank are circularly communicated with an overflow pipeline, the overflow pipeline is provided with an overflow valve, overflow openings are respectively arranged in the low-temperature storage tank and the high-temperature storage tank and are circularly communicated with the overflow pipeline, and the two overflow openings are respectively arranged above the balance pipeline openings corresponding to the two overflow openings; The first heat exchange pipeline is parallelly connected with a plurality of first heat exchange branches, each first heat exchange branch is matched with the ethoxylation reactor, is circularly communicated with the first heat exchanger of each ethoxylation reactor, and is provided with a first communication valve at an inlet end of each first heat exchanger. The second heat exchange pipeline is parallelly connected with a plurality of second heat exchange branches, each second heat exchange branch is matched with the distillation column kettle, is circularly communicated with the second heat exchanger of each distillation column kettle, and is provided with a second communication valve at an inlet end of each second heat exchanger.

2. The energy-saving device for heat source interoperation of high and low temperature according to claim 1, characterized in that, The heating mechanism comprises a heating jacket which surrounds the outer circumferential side of the bottom of the high-temperature storage tank, and the heating jacket is provided with a far-infrared heater which is arranged in a spaced manner with the high-temperature storage tank.

3. The energy-saving device for heat source interoperation of high and low temperature according to claim 2, characterized in that, The high-temperature storage tank and the second circulating pump are circularly communicated with a bypass pipeline which is circularly communicated with the low-temperature storage tank, and the bypass pipeline is provided with a bypass valve and a bypass pump.

4. The energy-saving device for heat source interoperation of high and low temperature according to claim 3, characterized in that, The volume of the low-temperature storage tank below the overflow opening is 4 / 5 of the overall volume, and the overflow opening of the high-temperature storage tank is not higher than the overflow opening of the low-temperature storage tank.

5. The energy-saving device for heat source interoperation of high and low temperature according to claim 4, characterized in that, The volumes of the low-temperature storage tank and the high-temperature storage tank are the same, the volume of the low-temperature storage tank is four times the sum of the volumes of each first heat exchange branch and each first heat exchanger, and the volume of the high-temperature storage tank is four times the sum of the volumes of each second heat exchange branch and each second heat exchanger.

6. An energy-saving method using the heat-conducting oil double-cycle high and low temperature heat source mutual use energy-saving device according to claim 5, characterized in that, The method comprises the following steps: Temperature rising and dehydration: the first heat exchange branch is in an open state, the first circulating pump and the first communication valve of the corresponding first heat exchanger are opened, the heat exchange medium with stored energy is circulated, the starting agent circulating pipeline is connected with the ethoxylation reactor, the starting agent is circulated, heat exchange is carried out between the starting agent and the first heat exchanger, the starting agent is heated to 100 DEG C to 120 DEG C, and temperature rising and dehydration are completed; The ethylene oxide dropwise adding reaction stage: ethylene oxide is dropwise added into the ethoxylation reactor, a large amount of reaction heat is released, and the heat exchange medium is heat exchanged through the first heat exchanger; after the reaction is completed, the first communication valves are closed; The rectification stage: the balance valve is opened, the heat exchange medium in the low-temperature storage tank is bypassed into the high-temperature storage tank, the balance valve is closed, the second circulating pump is opened, the second heat exchange branch is communicated, the heat exchange medium is circulated and the material in the rectification tower kettle is heated, and the far infrared heater is started to heat the heat exchange medium in the high-temperature storage tank to the required temperature; The rectification discharge: after the rectification is completed, the far infrared heater is stopped, and the bypass pump is started to return the heat exchange medium to the low-temperature storage tank.

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