CN114396823B - Waste heat recovery and utilization system for ethylene oxide aqueous solution - Google Patents
Waste heat recovery and utilization system for ethylene oxide aqueous solution Download PDFInfo
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- CN114396823B CN114396823B CN202210061691.0A CN202210061691A CN114396823B CN 114396823 B CN114396823 B CN 114396823B CN 202210061691 A CN202210061691 A CN 202210061691A CN 114396823 B CN114396823 B CN 114396823B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0012—Recuperative heat exchangers the heat being recuperated from waste water or from condensates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01B—BOILING; BOILING APPARATUS ; EVAPORATION; EVAPORATION APPARATUS
- B01B1/00—Boiling; Boiling apparatus for physical or chemical purposes ; Evaporation in general
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/30—Accessories for evaporators ; Constructional details thereof
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D301/00—Preparation of oxiranes
- C07D301/32—Separation; Purification
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D303/00—Compounds containing three-membered rings having one oxygen atom as the only ring hetero atom
- C07D303/02—Compounds containing oxirane rings
- C07D303/04—Compounds containing oxirane rings containing only hydrogen and carbon atoms in addition to the ring oxygen atoms
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The invention discloses a waste heat recycling system of an ethylene oxide aqueous solution, which belongs to the technical field of energy recycling in chemical production and comprises an ethylene oxide concentration tower, an ethylene oxide concentration tower primary feed heat exchanger, an ethylene oxide concentration tower kettle pump, an ethylene oxide concentration tower top heat exchanger, an ethylene oxide concentration tower secondary feed heat exchanger, an ethylene oxide absorption liquid heat exchanger, an ethylene oxide refining tower reboiler and an ethylene oxide refining tower, wherein an ethylene oxide dilute solution feed pipeline is communicated with the ethylene oxide concentration tower primary feed heat exchanger, and the ethylene oxide concentration tower primary feed heat exchanger is communicated with the ethylene oxide concentration tower secondary feed heat exchanger through an ethylene oxide concentration tower primary feed heat exchanger outlet pipeline. Solves the technical problem of poor waste heat recovery effect in the existing ethylene oxide production, and is mainly applied to the aspect of chemical production.
Description
Technical Field
The invention belongs to the technical field of energy recycling in chemical production, and particularly relates to a waste heat recycling system of an ethylene oxide aqueous solution.
Background
Ethylene Oxide (EO) is the second only organic chemical raw material in ethylene industry derivatives to polyethylene and polyvinyl chloride, and the main downstream product is Ethylene Glycol (EG), which accounts for about 70% of the total EO consumption. Meanwhile, other major downstream products of EO include aliphatic polyoxyethylene ether (AEO) surfactants, ethanolamines, polyethylene glycols, glycol ethers, and the like. The derivatives can be used as chemical raw materials for producing other fine chemical products, and can also be directly applied as products. The construction of the current ethylene oxide device is developed to the large-scale and technical direction, the annual production scale is more than 20 ten thousand tons, and the device economy of the ethylene glycol in China and the capability of the ethylene glycol in future market competition are greatly enhanced. Ethylene oxide attracts a great deal of investment as a high-profit product, and a great deal of newly-increased ethylene oxide devices are established in China in the future; this therefore faces excessive pressure on capacity and operational difficulties. This stimulates us to further dig and deepen the breadth and depth of the downstream application areas of ethylene oxide; on the other hand, the production process of the device is required to be further adjusted, the energy consumption system is optimized, the energy consumption of the device is reduced, and the competitiveness of enterprises is improved. At present, in the production process of the SHELL ethylene oxide in the Netherlands, heat of the tower top material of the ethylene oxide concentration tower is removed by heat exchange between an air cooler and air, and the tower top material of the ethylene oxide concentration tower is cooled. Thus, this heat is lost from the overhead material of the ethylene oxide concentrator column and is not fully utilized, while the downstream ethylene oxide refining system requires a significant amount of heat; if the heat can be recycled and used for a downstream unit, the energy consumption of the device is greatly reduced, and the benefit of enterprises is increased. At present, although many researches are carried out on optimizing the energy consumption of an ethylene oxide device, such as modification and optimization of an ethylene oxide concentration tower structure, optimization of operation parameters and the like; however, no reports are found on the heat recovery of the overhead material of the ethylene oxide concentration in an ethylene oxide production plant.
Disclosure of Invention
Aiming at the defects existing in the existing production process, the invention aims to provide a waste heat recycling system of an ethylene oxide aqueous solution, which adopts the following technical scheme:
the waste heat recovery and utilization system for the ethylene oxide aqueous solution comprises an ethylene oxide concentration tower, an ethylene oxide concentration tower primary feed heat exchanger, an ethylene oxide concentration tower kettle pump, an ethylene oxide concentration tower top heat exchanger, an ethylene oxide concentration tower secondary feed heat exchanger, an ethylene oxide absorption liquid heat exchanger, an ethylene oxide refining tower reboiler and an ethylene oxide refining tower, and is characterized in that an ethylene oxide dilute solution feed pipeline is communicated with the ethylene oxide concentration tower primary feed heat exchanger; the primary feeding heat exchanger of the ethylene oxide concentration tower is communicated with the secondary feeding heat exchanger of the ethylene oxide concentration tower through an outlet pipeline of the primary feeding heat exchanger of the ethylene oxide concentration tower; the second-stage feeding heat exchanger of the ethylene oxide concentration tower is communicated with the pump of the ethylene oxide concentration tower through a pump outlet pipeline of the ethylene oxide concentration tower, the pump of the ethylene oxide concentration tower is communicated with the lower part of the ethylene oxide concentration tower through a discharge pipeline of the ethylene oxide concentration tower, and the second-stage feeding heat exchanger of the ethylene oxide concentration tower is communicated with the upper part of the ethylene oxide concentration tower through a feeding pipeline of the ethylene oxide concentration tower; the upper part of the ethylene oxide concentration tower is communicated with an ethylene oxide concentration tower top heat exchanger through an ethylene oxide concentration tower top material pipeline, and the ethylene oxide concentration tower top heat exchanger is communicated with an ethylene oxide concentration tower top heat exchanger process material outlet pipeline; the tower top heat exchanger of the ethylene oxide concentration tower is communicated with the primary feeding heat exchanger outlet pipeline of the ethylene oxide concentration tower through the outlet pipeline of the tower top heat exchanger of the ethylene oxide concentration tower; the second-stage feeding heat exchanger of the ethylene oxide concentration tower is communicated with the ethylene oxide absorption liquid heat exchanger through an inlet pipeline of the ethylene oxide absorption liquid heat exchanger, the ethylene oxide absorption liquid heat exchanger is communicated with an ethylene oxide refining tower reboiler through an outlet pipeline of the ethylene oxide absorption liquid heat exchanger, and the ethylene oxide refining tower reboiler is communicated with the ethylene oxide refining tower through a pipeline; the reboiler of the ethylene oxide refining tower is also provided with an ethylene oxide absorption liquid cooling pipeline, and the ethylene oxide absorption liquid heat exchanger is also provided with a 0.2MPaG low-pressure steam pipeline and a 0.2MPaG low-pressure condensate pipeline.
Preferably: the ethylene oxide dilute solution pipeline is communicated with the ethylene oxide concentration tower top heat exchanger through a pipeline, the pipeline is provided with a regulating valve, and the process material outlet pipeline of the ethylene oxide concentration tower top heat exchanger is also provided with a thermometer.
Preferably: the length of a pipeline between the tube side discharge end of the ethylene oxide concentration tower top heat exchanger and the feed end of the ethylene oxide concentration tower secondary feed heat exchanger is as short as possible.
Preferably: the ethylene oxide absorption liquid heat exchanger provides heat for the inlet material of the ethylene oxide absorption liquid heat exchanger through a 0.2MPaG low-pressure steam pipeline.
Preferably: the primary feeding heat exchanger of the ethylene oxide concentration tower and the secondary feeding heat exchanger of the ethylene oxide concentration tower are all-welded plate type heat exchangers made of stainless steel, and the top heat exchanger of the ethylene oxide concentration tower and the ethylene oxide absorption liquid heat exchanger are shell-and-tube heat exchangers made of stainless steel. And the shell side discharge end of the ethylene oxide refining tower reboiler is connected with downstream equipment.
Preferably: the ethylene oxide aqueous solution exchanges heat with the material at the top of the ethylene oxide concentration tower through the heat exchanger at the top of the ethylene oxide concentration tower, and the heat of the material at the top of the ethylene oxide concentration tower is recovered, so that the energy-saving effect is formed.
Preferably: and a shell side discharge hole of the heat exchanger at the top of the ethylene oxide concentration tower is connected with a tower top buffer tank of the ethylene oxide concentration tower, and cooled ethylene oxide after heat exchange with an ethylene oxide aqueous solution is stored in the tower top buffer tank of the ethylene oxide concentration tower.
Preferably: and a regulating valve is arranged on a pipeline between the ethylene oxide water solution from the ethylene oxide absorption tower and the heat exchanger at the top of the ethylene oxide concentration tower.
Preferably: the length of the line between the aqueous ethylene oxide solution from the ethylene oxide absorber and the overhead heat exchanger of the ethylene oxide concentrator is as short as possible.
Preferably: the length of a pipeline between the tube side discharge end of the ethylene oxide concentration tower top heat exchanger and the feed end of the ethylene oxide concentration tower secondary feed heat exchanger is as short as possible.
Preferably: and a thermometer is arranged on a pipeline between a shell side discharge hole of the ethylene oxide concentration tower top heat exchanger and a tower top buffer tank of the ethylene oxide concentration tower and is used for controlling the flow of the ethylene oxide aqueous solution into the ethylene oxide concentration tower top heat exchanger.
Preferably: the ethylene oxide absorption liquid heat exchanger provides heat to the ethylene oxide absorption liquid heat exchanger inlet material through 0.2MPaG low pressure steam.
Preferably: the primary feeding heat exchanger of the ethylene oxide concentration tower and the secondary feeding heat exchanger of the ethylene oxide concentration tower are all-welded plate type heat exchangers made of stainless steel.
Preferably: the top heat exchanger of the ethylene oxide concentration tower and the ethylene oxide absorption liquid heat exchanger are stainless steel shell-and-tube heat exchangers.
The beneficial effects of the invention are as follows: compared with the prior art, the waste heat recycling system of the ethylene oxide aqueous solution provided by the invention adopts the shell-and-tube heat exchanger to replace an air cooler, has small equipment investment and small occupied space, effectively recovers the heat of the material at the top of the ethylene oxide concentration tower, avoids energy waste, thereby achieving the effects of energy conservation and emission reduction, greatly saving the consumption of 0.2MPaG steam of the ethylene oxide absorption liquid heat exchanger, saving more than twenty tons of steam per hour on average, and saving tens of millions of yuan per year for enterprises; meanwhile, the shell-and-tube heat exchanger is adopted to replace the design of a fan, and the electricity consumption is saved by millions of yuan each year.
Drawings
Fig. 1 is a schematic diagram of a system for recovering and utilizing waste heat of an aqueous solution of ethylene oxide provided by the invention.
In the figure: a 1-ethylene oxide dilute solution pipeline; 2-epoxyethane concentrating tower top heat exchanger; an outlet pipeline of a heat exchanger at the top of the 3-ethylene oxide concentration tower; a 4-ethylene oxide concentration column primary feed heat exchanger; an outlet pipeline of a primary feed heat exchanger of the 5-ethylene oxide concentration tower; a secondary feed heat exchanger of a 6-ethylene oxide concentration column; 7-ethylene oxide concentration tower feeding pipeline; a material pipeline at the top of the 8-ethylene oxide concentration tower; a 9-ethylene oxide concentration tower top heat exchanger process material outlet pipeline; a 10-ethylene oxide concentration column; a discharge pipeline of the tower kettle of the 11-ethylene oxide concentration tower; a 12-ethylene oxide concentration tower kettle pump; 13-an outlet pipeline of a tower kettle of the ethylene oxide concentration tower; an inlet pipeline of the 14-ethylene oxide absorption liquid heat exchanger; 15-ethylene oxide absorption liquid heat exchanger; 16-0.2MPaG low pressure steam pipeline; 17-0.2MPaG low pressure condensate pipeline; an outlet pipeline of the 18-ethylene oxide absorption liquid heat exchanger; 19-ethylene oxide absorber liquid cooling pipeline; 20-an ethylene oxide refining tower reboiler; a 21-ethylene oxide refining column; 22-a regulating valve; 23-thermometer.
Detailed Description
The invention is further illustrated by the following specific examples. These examples are merely illustrative of the invention and are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1:
the utility model provides a waste heat recovery utilizes system of ethylene oxide aqueous solution, includes ethylene oxide concentration tower 10, ethylene oxide concentration tower primary feed heat exchanger 4, ethylene oxide concentration tower cauldron pump 12, ethylene oxide concentration tower top heat exchanger 2, ethylene oxide concentration tower secondary feed heat exchanger 6, ethylene oxide absorption liquid heat exchanger 15, ethylene oxide refining tower reboiler 20 and ethylene oxide refining tower 21, its characterized in that: the ethylene oxide dilute solution feeding pipeline 1 is communicated with the primary feeding heat exchanger 4 of the ethylene oxide concentration tower; the primary feed heat exchanger 4 of the ethylene oxide concentration tower is communicated with the secondary feed heat exchanger 6 of the ethylene oxide concentration tower through an outlet pipeline 5 of the primary feed heat exchanger of the ethylene oxide concentration tower; the second-stage feeding heat exchanger 6 of the ethylene oxide concentration tower is communicated with the pump 12 of the ethylene oxide concentration tower through a pump outlet pipeline 13 of the ethylene oxide concentration tower, the pump 12 of the ethylene oxide concentration tower is communicated with the lower part of the ethylene oxide concentration tower 10 through a discharge pipeline of the ethylene oxide concentration tower, and the second-stage feeding heat exchanger 6 of the ethylene oxide concentration tower is communicated with the upper part of the ethylene oxide concentration tower 10 through a feeding pipeline 7 of the ethylene oxide concentration tower; the upper part of the ethylene oxide concentration tower 10 is communicated with the ethylene oxide concentration tower top heat exchanger 2 through an ethylene oxide concentration tower top material pipeline 8, and the ethylene oxide concentration tower top heat exchanger 2 is communicated with an ethylene oxide concentration tower top heat exchanger process material outlet pipeline 9; the top heat exchanger 2 of the ethylene oxide concentration tower is communicated with the outlet pipeline 5 of the primary feeding heat exchanger of the ethylene oxide concentration tower through the outlet pipeline 3 of the top heat exchanger of the ethylene oxide concentration tower; the second-stage feeding heat exchanger 6 of the ethylene oxide concentration tower is communicated with the ethylene oxide absorption liquid heat exchanger 15 through an ethylene oxide absorption liquid heat exchanger inlet pipeline 14, the ethylene oxide absorption liquid heat exchanger 15 is communicated with an ethylene oxide refining tower reboiler 20 through an ethylene oxide absorption liquid heat exchanger outlet pipeline 18, and the ethylene oxide refining tower reboiler 20 is communicated with an ethylene oxide refining tower 21 through a pipeline; the ethylene oxide refining tower reboiler 20 on still be equipped with ethylene oxide absorption liquid condensation pipeline 19, ethylene oxide absorption liquid heat exchanger 15 on still be equipped with 0.2MPaG low pressure steam line 16 and 0.2MPaG low pressure condensate line 17, ethylene oxide dilute solution pipeline 1 and ethylene oxide concentration tower overhead heat exchanger 2 between be linked together through the pipeline, the pipeline on be equipped with governing valve 22, ethylene oxide concentration tower overhead heat exchanger technology material export pipeline 9 on still be equipped with thermometer 23, the pipeline length between the tube side discharge end of ethylene oxide concentration tower overhead heat exchanger 2 and the ethylene oxide concentration tower second grade feed heat exchanger 6 feed end is as short as possible, ethylene oxide absorption liquid heat exchanger 15 provides heat to ethylene oxide absorption liquid heat exchanger 15 entry material through 0.2MPaG low pressure steam line 16, ethylene oxide concentration tower primary feed heat exchanger 4, ethylene oxide concentration tower second grade feed heat exchanger 6 adopt the whole welded plate type heat exchanger of stainless steel, ethylene oxide concentration tower overhead heat exchanger 2 and ethylene oxide concentration tower 2 are the heat exchanger of shell type that the ethylene oxide absorption liquid heat exchanger 15 adopts.
The working principle of the invention is as follows: a part of the dilute ethylene oxide aqueous solution with the temperature of 46+/-2 ℃ and the pressure of 1.25+/-0.1 MPaG in the ethylene oxide dilute solution pipeline 1 enters an ethylene oxide concentration tower top heat exchanger 2, and the other part enters an ethylene oxide concentration tower 10 after being heated by an ethylene oxide concentration tower primary feed heat exchanger 4 and an ethylene oxide concentration tower secondary feed heat exchanger 6, wherein the feed temperature is 105+/-2 ℃. The dilute ethylene oxide aqueous solution is heated and concentrated in an ethylene oxide concentration tower 10, the temperature of the tower top is 89+/-1 ℃, the pressure is 0.08+/-0.005 MPaG, the concentration is 78wt percent of concentrated ethylene oxide aqueous solution, the concentrated ethylene oxide aqueous solution is subjected to heat exchange and cooling with a part of dilute ethylene oxide aqueous solution by an ethylene oxide concentration tower top heat exchanger 2 to 65+/-2 ℃, then enters an ethylene oxide concentration tower top heat exchanger process material outlet pipeline 9, the dilute ethylene oxide aqueous solution subjected to heat exchange with the dilute ethylene oxide aqueous solution is heated to 68+/-2 ℃, and then is converged with the dilute ethylene oxide aqueous solution of an ethylene oxide concentration tower primary feed heat exchanger outlet pipeline 5, and then enters the ethylene oxide concentration tower 10 after being heated by an ethylene oxide concentration tower secondary feed heat exchanger 6. The temperature of the process material outlet pipeline 9 of the top heat exchanger of the ethylene oxide concentration tower is detected by a thermometer 23, and then the opening of a regulating valve 22 is controlled by a temperature sensor to control the flow rate of the dilute ethylene oxide aqueous solution entering the top heat exchanger 2 of the ethylene oxide concentration tower, so that the temperature of the process material outlet pipeline 9 of the top heat exchanger of the ethylene oxide concentration tower is controlled, and the temperature is set to 65 ℃. At the same time, the temperature of the ethylene oxide absorption liquid in the discharging pipeline 11 of the ethylene oxide concentration tower is 120+/-2 ℃, the ethylene oxide absorption liquid is conveyed to the second-stage feeding heat exchanger 6 of the ethylene oxide concentration tower through the pump 12 of the ethylene oxide concentration tower to heat the dilute ethylene oxide aqueous solution, then the ethylene oxide absorption liquid is heated to 86.8+/-2 ℃ through the heat exchanger 15 of the ethylene oxide absorption liquid by adopting 0.2MPaG low-pressure steam 16, then the ethylene oxide refining tower is heated through the reboiler 20 of the ethylene oxide refining tower, and the ethylene oxide is condensed in the liquid condensing pipeline 19 of the ethylene oxide absorption liquid after heat exchange in the reboiler 20 of the ethylene oxide refining tower and then is conveyed to a downstream unit. After the dilute ethylene oxide aqueous solution in the ethylene oxide dilute solution pipeline 1 is heated by the ethylene oxide concentrating tower top heat exchanger 2, the heat of the concentrated ethylene oxide aqueous solution in the ethylene oxide concentrating tower top material pipeline 8 is recovered, the heat is provided for the ethylene oxide refining tower reboiler 20, and the energy consumption of the device is reduced.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (8)
1. The utility model provides a waste heat recovery utilizes system of ethylene oxide aqueous solution, includes ethylene oxide concentration tower (10), ethylene oxide concentration tower primary feed heat exchanger (4), ethylene oxide concentration tower cauldron pump (12), ethylene oxide concentration tower top heat exchanger (2), ethylene oxide concentration tower secondary feed heat exchanger (6), ethylene oxide absorption liquid heat exchanger (15), ethylene oxide refining tower reboiler (20) and ethylene oxide refining tower (21), its characterized in that: the primary feeding heat exchanger (4) of the ethylene oxide concentration tower is communicated with the ethylene oxide dilute solution feeding pipeline (1); the primary feed heat exchanger (4) of the ethylene oxide concentration tower is communicated with the secondary feed heat exchanger (6) of the ethylene oxide concentration tower through an outlet pipeline (5) of the primary feed heat exchanger of the ethylene oxide concentration tower; the second-stage feeding heat exchanger (6) of the ethylene oxide concentration tower is communicated with the pump (12) of the ethylene oxide concentration tower through a pump outlet pipeline (13) of the ethylene oxide concentration tower, the pump (12) of the ethylene oxide concentration tower is communicated with the lower part of the ethylene oxide concentration tower (10) through a discharge pipeline (11) of the ethylene oxide concentration tower, and the second-stage feeding heat exchanger (6) of the ethylene oxide concentration tower is communicated with the upper part of the ethylene oxide concentration tower (10) through a feed pipeline (7) of the ethylene oxide concentration tower; the upper part of the ethylene oxide concentration tower (10) is communicated with an ethylene oxide concentration tower top heat exchanger (2) through an ethylene oxide concentration tower top material pipeline (8), and the ethylene oxide concentration tower top heat exchanger (2) is communicated with an ethylene oxide concentration tower top heat exchanger process material outlet pipeline (9); the top heat exchanger (2) of the ethylene oxide concentration tower is communicated with the outlet pipeline (5) of the primary feeding heat exchanger of the ethylene oxide concentration tower through the outlet pipeline (3) of the top heat exchanger of the ethylene oxide concentration tower; the second-stage feeding heat exchanger (6) of the ethylene oxide concentration tower is communicated with the ethylene oxide absorption liquid heat exchanger (15) through an ethylene oxide absorption liquid heat exchanger inlet pipeline (14), the ethylene oxide absorption liquid heat exchanger (15) is communicated with an ethylene oxide refining tower reboiler (20) through an ethylene oxide absorption liquid heat exchanger outlet pipeline (18), and the ethylene oxide refining tower reboiler (20) is communicated with an ethylene oxide refining tower (21) through a pipeline; the ethylene oxide refining tower reboiler (20) is also provided with an ethylene oxide absorber liquid cooling pipeline (19).
2. The waste heat recycling system of the ethylene oxide water solution according to claim 1, wherein the ethylene oxide absorption liquid heat exchanger (15) is further provided with a 0.2MPaG low-pressure steam pipeline (16) and a 0.2MPaG low-pressure condensate pipeline (17).
3. The system for recycling the waste heat of the ethylene oxide aqueous solution according to claim 1 is characterized in that the ethylene oxide dilute solution feeding pipeline (1) is communicated with the ethylene oxide concentration tower top heat exchanger (2) through a pipeline, an adjusting valve (22) is arranged on the pipeline, and a thermometer (23) is further arranged on a process material outlet pipeline (9) of the ethylene oxide concentration tower top heat exchanger.
4. The system for recycling waste heat of aqueous ethylene oxide solution according to claim 1, wherein the length of a pipeline between a tube side discharge end of the overhead heat exchanger (2) of the ethylene oxide concentration tower and a feed end of the secondary feed heat exchanger (6) of the ethylene oxide concentration tower is as short as possible.
5. The system for waste heat recovery and utilization of an aqueous ethylene oxide solution according to claim 1, wherein the ethylene oxide absorption liquid heat exchanger (15) provides heat to the ethylene oxide absorption liquid heat exchanger (15) inlet material through a 0.2MPaG low pressure steam line (16).
6. The system for recycling waste heat of aqueous ethylene oxide solution according to claim 1, wherein the primary feed heat exchanger (4) of the ethylene oxide concentration tower and the secondary feed heat exchanger (6) of the ethylene oxide concentration tower are all-welded plate heat exchangers made of stainless steel.
7. The system for recycling waste heat of aqueous ethylene oxide solution according to claim 1, wherein the top heat exchanger (2) of the ethylene oxide concentration tower and the ethylene oxide absorption liquid heat exchanger (15) are stainless steel shell-and-tube heat exchangers.
8. The application method of the waste heat recovery and utilization system of the ethylene oxide aqueous solution comprises the following steps:
1) A part of dilute ethylene oxide aqueous solution with the temperature of 46+/-2 ℃ and the pressure of 1.25+/-0.1 MPaG in an ethylene oxide dilute solution feeding pipeline (1) enters an ethylene oxide concentration tower top heat exchanger (2), and the other part enters an ethylene oxide concentration tower (10) after being heated by an ethylene oxide concentration tower primary feeding heat exchanger (4) and an ethylene oxide concentration tower secondary feeding heat exchanger (6), wherein the feeding temperature is 105+/-2 ℃;
2) Heating and concentrating the dilute ethylene oxide aqueous solution in an ethylene oxide concentration tower (10), wherein the temperature of the tower top is 89+/-1 ℃, the pressure is 0.08+/-0.005 MPaG, and the concentration is 78wt percent of concentrated ethylene oxide aqueous solution, then, carrying out heat exchange and cooling on the concentrated ethylene oxide aqueous solution and a part of the dilute ethylene oxide aqueous solution by an ethylene oxide concentration tower top heat exchanger (2) to 65+/-2 ℃, then, entering a process material outlet pipeline (9) of the ethylene oxide concentration tower top heat exchanger, heating the diluted ethylene oxide aqueous solution subjected to heat exchange with the dilute ethylene oxide aqueous solution to 68+/-2 ℃, merging the diluted ethylene oxide aqueous solution with a dilute ethylene oxide aqueous solution in an ethylene oxide concentration tower primary feed heat exchanger outlet pipeline (5), and then, heating the diluted ethylene oxide aqueous solution by an ethylene oxide concentration tower secondary feed heat exchanger (6), and entering the ethylene oxide concentration tower (10);
3) The temperature of the process material outlet pipeline (9) of the top heat exchanger of the ethylene oxide concentration tower is detected by a thermometer (23), then the opening of a regulating valve (22) is controlled by a temperature sensor to control the flow of the dilute ethylene oxide water solution entering the top heat exchanger (2) of the ethylene oxide concentration tower, so that the temperature of the process material outlet pipeline (9) of the top heat exchanger of the ethylene oxide concentration tower is controlled to 65 ℃, meanwhile, the temperature of the ethylene oxide absorption liquid of a discharge pipeline (11) of the ethylene oxide concentration tower is 120+/-2 ℃, the ethylene oxide absorption liquid is conveyed to a second-stage feeding heat exchanger (6) of the ethylene oxide concentration tower by a pump (12) of the ethylene oxide concentration tower, the dilute ethylene oxide water solution is heated by an ethylene oxide absorption liquid heat exchanger (15), 0.2MPaG low-pressure steam is adopted to heat 86.8+/-2 ℃, then the ethylene oxide refining tower (21) is heated by an ethylene oxide refining tower reboiler (20), and the ethylene oxide absorption liquid is condensed by the ethylene oxide refining tower reboiler (20) and then conveyed to a downstream unit after heat exchange.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210061691.0A CN114396823B (en) | 2022-01-19 | 2022-01-19 | Waste heat recovery and utilization system for ethylene oxide aqueous solution |
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| CN202210061691.0A CN114396823B (en) | 2022-01-19 | 2022-01-19 | Waste heat recovery and utilization system for ethylene oxide aqueous solution |
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| CN103566613B (en) * | 2012-08-06 | 2016-03-30 | 南通醋酸纤维有限公司 | A kind of low-concentration organic solvent aqueous solution reclaims heat pump distillation apparatus and technique |
| CN203620275U (en) * | 2014-03-04 | 2014-06-04 | 三江湖石化工有限公司 | High-efficiency ethylene oxide refining device |
| CN113072116B (en) * | 2020-01-06 | 2022-12-09 | 中国石油化工股份有限公司 | Method for treating epoxypropane wastewater |
| CN111423352B (en) * | 2020-05-19 | 2024-01-02 | 上海盛剑环境系统科技股份有限公司 | Recovery system and recovery method for N-methyl-2-pyrrolidone waste liquid |
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