CN114060789A - Method for recovering heat of isopropyl benzene device - Google Patents
Method for recovering heat of isopropyl benzene device Download PDFInfo
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- CN114060789A CN114060789A CN202111432518.9A CN202111432518A CN114060789A CN 114060789 A CN114060789 A CN 114060789A CN 202111432518 A CN202111432518 A CN 202111432518A CN 114060789 A CN114060789 A CN 114060789A
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- benzene
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- cumene
- preheater
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2/00—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms
- C07C2/54—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms by addition of unsaturated hydrocarbons to saturated hydrocarbons or to hydrocarbons containing a six-membered aromatic ring with no unsaturation outside the aromatic ring
- C07C2/64—Addition to a carbon atom of a six-membered aromatic ring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
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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
- Y02P20/10—Process efficiency
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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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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention belongs to the technical field of chemical engineering, and particularly relates to a method for recovering heat of a cumene device. The technical scheme is as follows: a method for recovering heat from a cumene plant comprising the steps of: s1: introducing a gas phase stream at the top of the isopropyl benzene tower into a tube side of a steam generator, and introducing a fully condensed stream into a benzene feeding primary preheater for cooling; s2: introducing a raw material benzene stream from a raw material benzene storage tank into a benzene feeding primary preheater for preheating; s3: preheating a boiler feed water stream from the outside and then introducing the preheated boiler feed water stream into a shell side steam generator to generate steam. The invention provides a method for fully recovering heat of a cumene product.
Description
Technical Field
The invention belongs to the technical field of chemical engineering, and particularly relates to a method for recovering heat of a cumene device.
Background
Cumene is an important organic chemical raw material, more than 95 percent of cumene is used as a raw material for producing phenol/acetone at present, the demand of phenol and bisphenol A which is a derivative thereof and polycarbonate is increased globally, the production capacity of the cumene is continuously expanded, and the cumene production capacity is in excess at any time. The material consumption difference of the cumene production devices at home and abroad is small, but the energy consumption difference of the cumene production process is large, obviously, the competitiveness of the cumene production devices depends on the energy consumption level.
In the production process of the cumene, if the heat of the cumene product is completely taken away by circulating water, the energy waste is large. Under the condition that the energy price is continuously increased, how to reduce the energy consumption of the device becomes a problem which is generally concerned by people.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a method for fully recovering the heat of a cumene product.
The technical scheme adopted by the invention is as follows:
a method for recovering heat from a cumene plant comprising the steps of:
s1: introducing a gas phase stream at the top of the isopropyl benzene tower into a tube side of a steam generator, and introducing a fully condensed stream into a benzene feeding primary preheater for cooling;
s2: introducing a raw material benzene stream from a raw material benzene storage tank into a benzene feeding primary preheater for preheating;
s3: preheating a boiler feed water stream from the outside and then introducing the preheated boiler feed water stream into a shell side steam generator to generate steam.
And the cumene overhead gas phase stream is introduced into a tube pass of the steam generator, and the boiler feed water stream outside the tube pass is introduced into a shell pass of the steam generator, so that the cumene overhead gas phase stream and the boiler feed water stream fully exchange heat, and the heat of the cumene overhead gas phase stream is fully utilized, thereby avoiding providing a heat source for preheating boiler feed water additionally. And the cumene is cooled by entering a benzene feeding primary preheater after passing through a steam generator. And the raw material benzene pipeline passes through the benzene feeding primary preheater, the raw material benzene stream absorbs the heat of the cumene in the benzene feeding primary preheater, and the heat of the gas phase stream at the top of the cumene tower is fully utilized again. The invention can use the heat of the cumene product for heating boiler feed water and raw material benzene, recover the sensible heat of the cumene product to the maximum extent and reduce the energy consumption of the device.
As a preferred scheme of the invention, in step S2, the stream preheated by the benzene feeding primary preheater is introduced into the benzene feeding secondary preheater to be continuously preheated, and then the benzene stream is heated, and the heated benzene stream is introduced into the benzene feeding guard bed to remove impurities; and introducing the refined benzene stream into a benzene feeding secondary preheater to recover heat. And enabling the stream preheated by the benzene feeding primary preheater to enter a benzene feeding secondary preheater for continuous preheating. Raw material benzene enters a benzene feeding protective bed through a raw material benzene pipeline to remove impurities, and a refined benzene flow enters a benzene feeding secondary preheater through a benzene heat recovery pipeline to recover heat. The raw material benzene after impurity removal provides heat for the raw material benzene before impurity removal, and external heat is not consumed.
As a preferred embodiment of the present invention, in the step S3, when preheating the boiler feed water stream, the boiler feed water is introduced into the boiler feed water preheater to be preheated, and the benzene stream passing through the benzene feeding secondary preheater is sent to the boiler feed water preheater to recover heat. The raw material benzene after heat recovery enters a boiler water supply preheater, so that the heat in the flow is reused, the boiler water supply is over-heated, and the boiler water supply absorption heat is further improved.
In a preferred embodiment of the present invention, the boiler feed water preheater is located at an end of the secondary benzene feed preheater remote from the guard bed.
In a preferred embodiment of the present invention, in step S2, the benzene stream is preheated and then heated by passing the benzene stream through a benzene feed steam heater. Benzene feeding steam heater can carry out reheating to the raw materials benzene after benzene feeding primary preheater and benzene feeding secondary preheater heating, guarantees that raw materials benzene gets into benzene feeding guard bed with high enough temperature and takes off impurity.
In a preferred embodiment of the present invention, in step S1, the cumene stream cooled by the benzene feeding primary preheater is passed to a cumene cooler for further cooling. The cumene after the benzene feeding primary preheater enters a cumene cooler for fully cooling, so that the heat in the cumene can be fully utilized, and the cooled cumene stream is convenient to be sent to a storage tank for storage.
In a preferred embodiment of the present invention, the cumene cooler is located at the end of the benzene feed primary preheater remote from the steam generator.
As a preferred embodiment of the present invention, in step S3, the benzene stream after heat recovery through the boiler feed water preheater is sent to the rectifying column.
In a preferred embodiment of the present invention, in step S1, the cooled cumene is sent to a cumene storage tank.
The invention has the beneficial effects that:
the steam generator can ensure that the cumene overhead gas phase flow and the boiler feed water flow fully exchange heat, and the heat of the cumene overhead gas phase flow is fully utilized, so that a heat source for preheating the boiler feed water is not required to be additionally provided. And the cumene is cooled by entering a benzene feeding primary preheater after passing through a steam generator. And the raw material benzene pipeline passes through the benzene feeding primary preheater, the raw material benzene stream absorbs the heat of the cumene in the benzene feeding primary preheater, and the heat of the gas phase stream at the top of the cumene tower is fully utilized again. The invention can use the heat of the cumene product for heating boiler feed water and raw material benzene, recover the sensible heat of the cumene product to the maximum extent and reduce the energy consumption of the device.
Drawings
FIG. 1 is a flow chart of a method of the present invention;
fig. 2 is a schematic diagram of the structure of a system used in the present invention.
In the figure, 1-steam generator; introducing the gas phase at the top of the 2-isopropylbenzene tower into a pipeline; a 3-cumene heat recovery pipeline; 4-raw material benzene pipeline; 5-boiler feed water line; 6-steam pipeline; a 7-benzene heat recovery pipeline; a 31-benzene feed primary preheater; a 32-cumene cooler; a 41-benzene feed guard bed; a 42-benzene feed steam heater; 71-benzene feed secondary preheater; 72-boiler feed water preheater.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
As shown in fig. 1, the method for recovering heat of a cumene plant according to the present embodiment comprises the following steps:
s1: introducing a gas phase stream at the top of the isopropyl benzene tower into a tube side of a steam generator 1, and introducing a fully condensed stream into a benzene feeding primary preheater 31 for cooling;
s2: introducing a raw material benzene stream from a raw material benzene storage tank into a benzene feeding primary preheater 31 for preheating;
s3: the boiler feed water stream from the outside is preheated and then passed to the shell side of the steam generator 1 for steam generation.
The cumene column top gas phase stream is introduced into the tube pass of the steam generator 1, the boiler feed water stream outside the tube pass is introduced into the shell pass of the steam generator 1, the cumene column top gas phase stream and the boiler feed water stream fully exchange heat, and the heat of the cumene column top gas phase stream is fully utilized, so that a heat source for preheating boiler feed water is not required to be additionally provided. After passing through the steam generator 1, the cumene is cooled by entering a benzene feeding primary preheater 31. And the raw material benzene pipeline 4 passes through the benzene feeding primary preheater 31, the raw material benzene stream absorbs the heat of the cumene in the benzene feeding primary preheater 31, and the heat of the gas phase stream at the top of the cumene tower is fully utilized again. The invention can use the heat of the cumene product for heating boiler feed water and raw material benzene, recover the sensible heat of the cumene product to the maximum extent and reduce the energy consumption of the device.
Further, in step S2, the stream preheated by the benzene feeding primary preheater 31 is introduced into the benzene feeding secondary preheater 71 to be preheated, and then the benzene stream is heated, and the heated benzene stream is introduced into the benzene feeding guard bed 41 to remove impurities; the refined benzene stream is passed to a benzene feed secondary preheater 71 for heat recovery. The stream preheated by the benzene feed primary preheater 31 enters the benzene feed secondary preheater 71 for continuous preheating. Raw material benzene enters the benzene feeding protective bed 41 through a raw material benzene pipeline 4 to remove impurities, and a refined benzene flow enters the benzene feeding secondary preheater 71 through a benzene heat recovery pipeline 7 to recover heat. The raw material benzene after impurity removal provides heat for the raw material benzene before impurity removal, and external heat is not consumed.
Further, in step S3, when preheating the boiler feed water stream, the boiler feed water is passed to the boiler feed water preheater 72 to be preheated, and the benzene stream having passed through the benzene feeding secondary preheater 71 is sent to the boiler feed water preheater 72 to recover heat. The benzene stream, having been recovered from the heat in the boiler feed water preheater 72, is sent to the rectification column. The heat recovered raw benzene enters the boiler feed water preheater 72 so that the heat in the stream is reused and the boiler feed water is over-heated, further increasing the boiler feed water absorption heat. The boiler feed water preheater 72 is located at the end of the benzene feed secondary preheater 71 remote from the benzene feed guard bed 41.
Specifically, in step S2, after the benzene feed stream is preheated, the benzene feed stream is heated by passing it through the benzene feed steam heater 42. The benzene feed steam heater 42 is capable of reheating the benzene feedstock after it has been heated by the benzene feed primary preheater 31 and the benzene feed secondary preheater 71 to ensure that the benzene feedstock enters the benzene feed guard bed 41 at a sufficiently high temperature to remove impurities.
Further, in step S1, the cumene stream cooled by the benzene feeding primary preheater 31 is introduced into the cumene cooler 32 to be cooled continuously, and the cooled cumene is sent to the cumene storage tank. The cumene after the benzene feeding primary preheater 31 enters the cumene cooler 32 for sufficient temperature reduction, so that the heat in the cumene can be fully utilized, and the cooled cumene stream is convenient to be sent to a storage tank for storage. The cumene cooler 32 is located at the end of the benzene feed primary preheater 31 remote from the steam generator 1.
As shown in fig. 2, the system used in the present invention:
the device comprises a steam generator 1, wherein a cumene tower top gas phase inlet pipeline 2 is connected to the tube side of the steam generator 1, a cumene heat recovery pipeline 3 is connected to the other end of the tube side of the steam generator 1, and a benzene feeding primary preheater 31 is connected to the cumene heat recovery pipeline 3; the system also comprises a raw material benzene pipeline 4, wherein the raw material benzene pipeline 4 is fed into the primary preheater 31 through benzene; the steam generator further comprises a boiler water feeding pipeline 5, the boiler water feeding pipeline 5 is connected to the shell pass of the steam generator 1, and the other end of the shell pass of the steam generator 1 is connected with a steam pipeline 6. The cumene heat recovery pipeline 3 is connected to a cumene storage tank.
The cumene column top gas phase stream is introduced into the tube pass of the steam generator 1, the boiler feed water stream outside the tube pass is introduced into the shell pass of the steam generator 1, the cumene column top gas phase stream and the boiler feed water stream fully exchange heat, and the heat of the cumene column top gas phase stream is fully utilized, so that a heat source for preheating boiler feed water is not required to be additionally provided. After passing through the steam generator 1, the cumene is cooled by entering a benzene feeding primary preheater 31. And the raw material benzene pipeline 4 passes through the benzene feeding primary preheater 31, the raw material benzene stream absorbs the heat of the cumene in the benzene feeding primary preheater 31, and the heat of the gas phase stream at the top of the cumene tower is fully utilized again. The invention can use the heat of the cumene product for heating boiler feed water and raw material benzene, recover the sensible heat of the cumene product to the maximum extent and reduce the energy consumption of the device.
Still be connected with benzene feeding protection bed 41 on the raw materials benzene pipeline 4, the exit end of benzene feeding protection bed 41 is connected with benzene heat recovery pipeline 7, is connected with benzene feeding secondary preheater 71 on the benzene heat recovery pipeline 7, passes through benzene feeding secondary preheater 71 behind the raw materials benzene pipeline 4 through the primary preheater. The stream preheated by the benzene feed primary preheater 31 enters the benzene feed secondary preheater 71 for continuous preheating. The benzene heat recovery line 7 is connected to a rectifying column. Raw material benzene enters the benzene feeding protective bed 41 through a raw material benzene pipeline 4 to remove impurities, and a refined benzene flow enters the benzene feeding secondary preheater 71 through a benzene heat recovery pipeline 7 to recover heat. The raw material benzene after impurity removal provides heat for the raw material benzene before impurity removal, and external heat is not consumed.
The benzene heat recovery pipeline 7 is also connected with a boiler feed water preheater 72, and the boiler feed water pipeline 5 passes through the boiler feed water preheater 72. The heat recovered raw benzene enters the boiler feed water preheater 72 so that the heat in the stream is reused and the boiler feed water is over-heated, further increasing the boiler feed water absorption heat. The boiler feed water preheater 72 is located at the end of the benzene feed secondary preheater 71 remote from the benzene feed guard bed 41.
The raw material benzene pipeline 4 is also connected with a benzene feeding steam heater 42. The benzene feed steam heater 42 is capable of reheating the benzene feedstock after it has been heated by the benzene feed primary preheater 31 and the benzene feed secondary preheater 71 to ensure that the benzene feedstock enters the benzene feed guard bed 41 at a sufficiently high temperature to remove impurities.
The cumene heat recovery pipeline 3 is also connected with a cumene cooler 32. The cumene after the benzene feeding primary preheater 31 enters the cumene cooler 32 for sufficient temperature reduction, so that the heat in the cumene can be fully utilized, and the cooled cumene stream is convenient to be sent to a storage tank for storage. The cumene cooler 32 is located at the end of the benzene feed primary preheater 31 remote from the steam generator 1.
The working process is as follows:
introducing a gas phase stream from the cumene column into a tube pass of the steam generator 1 for total condensation, and introducing a stream at 161.1 ℃ into a benzene feeding primary preheater 31 for cooling; the stream with the temperature of 96.9 ℃ enters a cumene cooler 32 to be continuously cooled, and the stream with the temperature of 43 ℃ is sent to a storage tank for storage. Introducing a raw material benzene stream at 35 ℃ into a benzene feeding primary preheater 31 for preheating, and introducing a stream at 141 ℃ into a benzene feeding secondary preheater 71 for continuously preheating; the stream at 165 ℃ enters a benzene feeding steam heater 42 for heating, and the stream at 180 ℃ enters a benzene feeding guard bed 41 for removing impurities; the refined benzene stream at 180 ℃ enters a benzene feeding secondary preheater 71 to recover heat, the stream at 156.7 ℃ enters a boiler feed water preheater 72 to continuously recover heat, and the stream at 98.7 ℃ is sent to a rectifying tower. The 95 ℃ boiler feed water stream is fed into a boiler feed water preheater 72 for preheating, and the 145 ℃ stream is fed into the shell side by-product saturated steam of the steam generator 1.
The sensible heat at the top of the cumene tower in the traditional method is completely taken away by circulating cooling water, so that a great deal of energy is wasted. The invention realizes the reutilization of energy by utilizing the sensible heat at the top of the cumene tower, thereby saving water and energy. Although the heat exchanger is added, the investment is disposable, the consumption of a large amount of steam and circulating water is saved in long-term production, the production cost is reduced on the whole, and the purposes of saving energy and water are further achieved, theoretically, the steam is saved by about 63 percent, the water is saved by about 57 percent, the amount of by-product low-pressure steam is increased by about 11 percent, and the effects of saving energy and water are remarkable.
The invention is not limited to the above alternative embodiments, and any other various forms of products can be obtained by anyone in the light of the present invention, but any changes in shape or structure thereof, which fall within the scope of the present invention as defined in the claims, fall within the scope of the present invention.
Claims (9)
1. The method for recovering the heat of the cumene device is characterized by comprising the following steps of:
s1: introducing a gas phase stream at the top of the isopropyl benzene tower into a tube side of a steam generator (1), and introducing a fully condensed stream into a benzene feeding primary preheater (31) for cooling;
s2: introducing a raw material benzene stream from a raw material benzene storage tank into a benzene feeding primary preheater (31) for preheating;
s3: preheating a boiler feed water stream from the outside and then introducing the preheated boiler feed water stream into a shell side steam generation device (1).
2. The method for recovering heat of the cumene plant according to claim 1, wherein in step S2, the stream preheated by the benzene feeding primary preheater (31) is passed into the benzene feeding secondary preheater (71) to be preheated, and then the benzene stream is heated, and the heated benzene stream is passed into the benzene feeding guard bed (41) to remove impurities; the refined benzene stream is passed to a benzene feed secondary preheater (71) to recover heat.
3. The method for recovering heat of cumene plant according to claim 2, wherein in the step S3, when preheating the boiler feed water stream, the boiler feed water is passed into the boiler feed water preheater (72) to be preheated, and the benzene stream after passing through the benzene feeding secondary preheater (71) is sent to the boiler feed water preheater (72) to recover heat.
4. A method for recovering heat from a cumene plant according to claim 3 wherein said boiler feed water preheater (72) is located at an end of the benzene feed secondary preheater (71) remote from the benzene feed guard bed (41).
5. The method of claim 2, wherein the benzene feed steam heater (42) is used to heat the benzene stream after the benzene stream is preheated in step S2.
6. The method for recovering heat from a cumene plant according to claim 1 wherein in step S1 the cumene stream after having been cooled down by the benzene feed primary preheater (31) is passed to the cumene cooler (32) for further cooling down.
7. A method for recovering heat from a cumene plant according to claim 6 wherein said cumene cooler (32) is located at the end of the benzene feed primary preheater (31) remote from the steam generator (1).
8. The method for recovering heat from a cumene plant according to claim 3 wherein in step S3, the benzene stream after heat recovery through boiler feed water preheater (72) is sent to the rectification column.
9. The method according to any one of claims 1 to 8, wherein the cooled cumene is sent to a cumene storage tank in step S1.
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| CN202111432518.9A CN114060789B (en) | 2021-11-29 | 2021-11-29 | Method for recovering heat of cumene device |
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| CN202111432518.9A CN114060789B (en) | 2021-11-29 | 2021-11-29 | Method for recovering heat of cumene device |
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| CN114060789A true CN114060789A (en) | 2022-02-18 |
| CN114060789B CN114060789B (en) | 2023-06-16 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102553280A (en) * | 2012-03-07 | 2012-07-11 | 天津大沽化工股份有限公司 | Benzene/toluene tower type primary preheating device |
| CN206881182U (en) * | 2017-06-21 | 2018-01-16 | 河北乐恒化工设备制造有限公司 | The device of energy-efficient concentrate |
| CN108844054A (en) * | 2018-07-30 | 2018-11-20 | 河南心连心化肥有限公司 | A kind of synthesis ammonia system heat reclaim unit and heat recovery technique |
| CN109847394A (en) * | 2019-03-28 | 2019-06-07 | 湖北三宁化工股份有限公司 | A kind of system and method that ethylene glycol rectifier unit process waste recycles |
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2021
- 2021-11-29 CN CN202111432518.9A patent/CN114060789B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102553280A (en) * | 2012-03-07 | 2012-07-11 | 天津大沽化工股份有限公司 | Benzene/toluene tower type primary preheating device |
| CN206881182U (en) * | 2017-06-21 | 2018-01-16 | 河北乐恒化工设备制造有限公司 | The device of energy-efficient concentrate |
| CN108844054A (en) * | 2018-07-30 | 2018-11-20 | 河南心连心化肥有限公司 | A kind of synthesis ammonia system heat reclaim unit and heat recovery technique |
| CN109847394A (en) * | 2019-03-28 | 2019-06-07 | 湖北三宁化工股份有限公司 | A kind of system and method that ethylene glycol rectifier unit process waste recycles |
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| 沈清波;杜世杰;: "异丙苯塔控制系统优化设计应用研究" * |
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