CN114060789B - Method for recovering heat of cumene device - Google Patents
Method for recovering heat of cumene device Download PDFInfo
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- CN114060789B CN114060789B CN202111432518.9A CN202111432518A CN114060789B CN 114060789 B CN114060789 B CN 114060789B CN 202111432518 A CN202111432518 A CN 202111432518A CN 114060789 B CN114060789 B CN 114060789B
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- benzene
- preheater
- cumene
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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 industry, and particularly relates to a method for recovering heat of a cumene device. The technical proposal is as follows: a method for recovering heat from a cumene plant, comprising the steps of: s1: introducing a gas phase flow at the top of the isopropylbenzene tower into a tube side of a steam generator, and introducing the fully condensed flow into a benzene feeding primary preheater for cooling; s2: the raw material benzene stream from the raw material benzene storage tank is fed into a benzene feed primary preheater for preheating; s3: preheating a boiler feed water stream from outside the boundary and then introducing the preheated feed water stream into a shell side of a steam generator to produce steam. The invention provides a method capable of fully recovering heat of a cumene product.
Description
Technical Field
The invention belongs to the technical field of chemical industry, 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% of cumene is currently used as a raw material for producing phenol/acetone, and the global demand of bisphenol A and polycarbonate, which are derivatives of phenol and bisphenol A, is increased, the production capacity of cumene is continuously enlarged, and the productivity of cumene is always in excess. The material consumption of the cumene production device at home and abroad is small, but the energy consumption of the cumene production process is very different, and obviously, the competitiveness of the cumene production device depends on the energy consumption level.
In the production process of the isopropylbenzene, if the heat of the isopropylbenzene product is taken away by the circulating water, the energy waste is large. Under the condition that the price of energy is continuously increased, how to reduce the energy consumption of the device has become a general concern.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a method for fully recovering 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 flow at the top of the isopropylbenzene tower into a tube side of a steam generator, and introducing the fully condensed flow into a benzene feeding primary preheater for cooling;
s2: the raw material benzene stream from the raw material benzene storage tank is fed into a benzene feed primary preheater for preheating;
s3: preheating a boiler feed water stream from outside the boundary and then introducing the preheated feed water stream into a shell side of a steam generator to produce steam.
The gas phase flow of the isopropylbenzene tower top is led into the tube side of the steam generator, and the boiler feed water flow outside the boundary is led into the shell side of the steam generator, so that the gas phase flow of the isopropylbenzene tower top and the boiler feed water flow fully exchange heat, and the heat of the gas phase flow of the isopropylbenzene tower top is fully utilized, thereby the heat source for preheating the boiler feed water is not needed to be additionally provided. After passing through the steam generator, the cumene is cooled by entering a benzene feeding primary preheater. And the raw material benzene pipeline passes through the benzene feeding primary preheater, the raw material benzene flow absorbs the heat of the isopropylbenzene in the benzene feeding primary preheater, and the heat of the gas phase flow at the top of the isopropylbenzene is fully utilized again. The invention can use the heat of the cumene product to heat the boiler feed water and the raw material benzene, furthest recover the sensible heat of the cumene product and reduce the energy consumption of the device.
In the step S2, the flow preheated by the primary benzene-feeding preheater is fed into the secondary benzene-feeding preheater for continuous preheating, and then the benzene flow is heated, and the heated benzene flow is fed into the benzene-feeding protection bed for removing impurities; the refined benzene stream is passed to a benzene feed secondary preheater to recover heat. The flow preheated by the benzene feed primary preheater enters the benzene feed secondary preheater to be continuously preheated. Raw material benzene enters a benzene feeding protection 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 removing the impurities provides heat for the raw material benzene before removing the impurities, and does not consume external heat.
In step S3, the boiler feed water is preheated by passing the boiler feed water into a boiler feed water preheater, and the benzene stream after passing the benzene feed secondary preheater is fed to the boiler feed water preheater to recover heat. The raw material benzene after heat recovery enters a boiler feed water preheater, so that the heat in the flow is reused, and the boiler feed water is subjected to heat supply, so that the heat absorption of the boiler feed water is further improved.
As a preferred embodiment of the invention, the boiler feed water preheater is located at the end of the benzene feed secondary preheater remote from the benzene feed guard bed.
In a preferred embodiment of the present invention, in step S2, the raw benzene stream is preheated and then fed to a benzene feed steam heater for heating. The benzene feeding steam heater can reheat the raw material benzene heated by the benzene feeding primary preheater and the benzene feeding secondary preheater, so that the raw material benzene is ensured to enter the benzene feeding protection bed at a high enough temperature to remove impurities.
In step S1, the cumene stream cooled by the benzene feed primary preheater is introduced into a cumene cooler for further cooling. The cumene after passing through the benzene feeding primary preheater enters the cumene cooler again for full cooling, so that the heat in the cumene can be fully utilized, and the cooled cumene flow is ensured to be conveniently sent to a storage tank for storage.
As a preferred embodiment of the invention, the cumene cooler is located at the end of the benzene feed primary preheater remote from the steam generator.
In a preferred embodiment of the present invention, in step S3, the benzene stream after heat recovery by the boiler feedwater preheater is sent to a rectifying column.
In a preferred embodiment of the present invention, in step S1, cumene after the temperature reduction is sent to a cumene storage tank.
The beneficial effects of the invention are as follows:
the steam generator can fully exchange heat between the gas phase flow at the top of the isopropylbenzene tower and the boiler feedwater flow, and fully utilize the heat of the gas phase flow at the top of the isopropylbenzene tower, so that a heat source for preheating the boiler feedwater is not needed to be additionally provided. After passing through the steam generator, the cumene is cooled by entering a benzene feeding primary preheater. And the raw material benzene pipeline passes through the benzene feeding primary preheater, the raw material benzene flow absorbs the heat of the isopropylbenzene in the benzene feeding primary preheater, and the heat of the gas phase flow at the top of the isopropylbenzene is fully utilized again. The invention can use the heat of the cumene product to heat the boiler feed water and the raw material benzene, furthest recover the sensible heat of the cumene product and reduce the energy consumption of the device.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
fig. 2 is a schematic diagram of a system used in the present invention.
In the figure, a 1-steam generator; the gas phase at the top of the 2-isopropylbenzene tower is communicated with a pipeline; 3-isopropylbenzene heat recovery pipeline; 4-a raw benzene pipeline; 5-boiler feed water pipeline; 6-a steam pipeline; 7-benzene heat recovery pipeline; 31-benzene feed primary preheater; a 32-cumene cooler; 41-benzene feed guard bed; 42-benzene feed steam heater; a 71-benzene feed secondary preheater; 72-boiler feed water preheater.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
As shown in fig. 1, the method for recovering heat of the cumene device of the present embodiment includes the following steps:
s1: introducing the gas phase flow from the top of the isopropylbenzene tower into the tube side of the steam generator 1, and introducing the fully condensed flow into the benzene feeding primary preheater 31 for cooling;
s2: the raw benzene stream from the raw benzene storage tank is passed to a benzene feed primary preheater 31 for preheating;
s3: the shell side of the steam generator 1 is fed with steam after preheating the feed water stream from the boiler outside the boundary.
The gas phase flow of the isopropylbenzene tower top is led into the tube side of the steam generator 1, and the boiler feedwater flow outside the boundary is led into the shell side of the steam generator 1, so that the gas phase flow of the isopropylbenzene tower top and the boiler feedwater flow fully exchange heat, and the heat of the gas phase flow of the isopropylbenzene tower top is fully utilized, thereby the heat source for preheating the boiler feedwater is not needed to be additionally provided. After passing through the steam generator 1, cumene is cooled by passing into the benzene feed 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 isopropylbenzene in the benzene feeding primary preheater 31, and the heat of the gas phase stream at the top of the isopropylbenzene tower is fully utilized again. The invention can use the heat of the cumene product to heat the boiler feed water and the raw material benzene, furthest recover the sensible heat of the cumene product and reduce the energy consumption of the device.
Further, in step S2, the stream preheated by the first preheater 31 for feeding benzene is fed to the second preheater 71 for feeding benzene for further preheating, and then the benzene stream is heated, and the heated benzene stream is fed to the guard bed 41 for feeding benzene 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 to continue preheating. Raw benzene enters a benzene feed protection bed 41 through a raw benzene pipeline 4 to remove impurities, and a refined benzene stream enters a benzene feed secondary preheater 71 through a benzene heat recovery pipeline 7 to recover heat. The raw material benzene after removing the impurities provides heat for the raw material benzene before removing the impurities, and does not consume external heat.
Further, in step S3, when the boiler feed water stream is preheated, the boiler feed water is passed to the boiler feed water preheater 72 to be preheated, and the benzene stream after passing through the benzene feed secondary preheater 71 is passed to the boiler feed water preheater 72 to recover heat. The benzene stream after heat recovery by the boiler feed water preheater 72 is sent to a rectifying column. The heat recovered raw benzene enters the boiler feedwater preheater 72 so that the heat in the stream is re-used and the boiler feedwater is provided with heat to further enhance the heat absorption of the boiler feedwater. 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 feed benzene stream is preheated again, the feed benzene stream is passed to the benzene feed steam heater 42 for heating. The benzene feed steam heater 42 can reheat the raw benzene heated by the benzene feed primary preheater 31 and the benzene feed secondary preheater 71 to ensure that the raw benzene 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 feed primary preheater 31 is passed to the cumene cooler 32 for further cooling, and the cooled cumene is sent to the cumene storage tank. The cumene after passing through the benzene feeding primary preheater 31 enters the cumene cooler 32 again for sufficient cooling, so that the heat in the cumene can be fully utilized, and the cooled cumene flow is ensured to be conveniently 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 system comprises a steam generator 1, wherein a tube side of the steam generator 1 is connected with a cumene tower top gas phase communication pipeline 2, the other end of the tube side of the steam generator 1 is connected with a cumene heat recovery pipeline 3, and the cumene heat recovery pipeline 3 is connected with a benzene feeding primary preheater 31; 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 boiler water supply pipeline 5 is connected to the shell side of the steam generator 1, and the other end of the shell side of the steam generator 1 is connected with a steam pipeline 6. The cumene heat recovery line 3 is connected to a cumene storage tank.
The gas phase flow of the isopropylbenzene tower top is led into the tube side of the steam generator 1, and the boiler feedwater flow outside the boundary is led into the shell side of the steam generator 1, so that the gas phase flow of the isopropylbenzene tower top and the boiler feedwater flow fully exchange heat, and the heat of the gas phase flow of the isopropylbenzene tower top is fully utilized, thereby the heat source for preheating the boiler feedwater is not needed to be additionally provided. After passing through the steam generator 1, cumene is cooled by passing into the benzene feed 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 isopropylbenzene in the benzene feeding primary preheater 31, and the heat of the gas phase stream at the top of the isopropylbenzene tower is fully utilized again. The invention can use the heat of the cumene product to heat the boiler feed water and the raw material benzene, furthest recover the sensible heat of the cumene product and reduce the energy consumption of the device.
The raw material benzene pipeline 4 is also connected with a benzene feed protection bed 41, the outlet end of the benzene feed protection bed 41 is connected with a benzene heat recovery pipeline 7, the benzene heat recovery pipeline 7 is connected with a benzene feed secondary preheater 71, and the raw material benzene pipeline 4 passes through the benzene feed secondary preheater 71 after passing through the primary preheater. The stream preheated by the benzene feed primary preheater 31 enters the benzene feed secondary preheater 71 to continue preheating. The benzene heat recovery line 7 is connected to a rectifying column. Raw benzene enters a benzene feed protection bed 41 through a raw benzene pipeline 4 to remove impurities, and a refined benzene stream enters a benzene feed secondary preheater 71 through a benzene heat recovery pipeline 7 to recover heat. The raw material benzene after removing the impurities provides heat for the raw material benzene before removing the impurities, and does not consume external heat.
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 feedwater preheater 72 so that the heat in the stream is re-used and the boiler feedwater is provided with heat to further enhance the heat absorption of the boiler feedwater. 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.
A benzene feed steam heater 42 is also connected to the raw benzene line 4. The benzene feed steam heater 42 can reheat the raw benzene heated by the benzene feed primary preheater 31 and the benzene feed secondary preheater 71 to ensure that the raw benzene enters the benzene feed guard bed 41 at a sufficiently high temperature to remove impurities.
And the cumene heat recovery pipeline 3 is also connected with a cumene cooler 32. The cumene after passing through the benzene feeding primary preheater 31 enters the cumene cooler 32 again for sufficient cooling, so that the heat in the cumene can be fully utilized, and the cooled cumene flow is ensured to be conveniently 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 comprises the following steps:
introducing a gas-phase flow from the isopropylbenzene tower into a tube side of a steam generator 1 for complete condensation, and introducing a flow at 161.1 ℃ into a benzene feed primary preheater 31 for cooling; the 96.9deg.C stream enters cumene cooler 32 to continue cooling and the 43deg.C stream is sent to storage tanks for storage. The raw material benzene stream at 35 ℃ is fed into the benzene feed primary preheater 31 for preheating, and the stream at 141 ℃ is fed into the benzene feed secondary preheater 71 for continuous preheating; the stream at 165 ℃ enters a benzene feed steam heater 42 to be heated, and the stream at 180 ℃ enters a benzene feed guard bed 41 to remove impurities; the 180 ℃ refined benzene stream enters the benzene feed secondary preheater 71 to recover heat, the 156.7 ℃ stream enters the boiler feed water preheater 72 to continuously recover heat, and the 98.7 ℃ stream is sent to the rectifying tower. The boiler feed water stream at 95 ℃ enters a boiler feed water preheater 72 for preheating, and the stream at 145 ℃ is introduced into the shell side of the steam generator 1 to produce saturated steam as a byproduct.
The sensible heat of the top of the isopropylbenzene tower in the traditional method is taken away by circulating cooling water, so that a great amount of energy is wasted. The invention utilizes the sensible heat of the top of the isopropylbenzene tower to realize the recycling of energy, thereby saving water and energy. Although the heat exchanger is added, the investment is disposable, and the long-term production saves a great amount of steam and circulating water consumption, so that the production cost is reduced overall, the purposes of saving energy and saving water are achieved, the steam is saved by 63% or so theoretically, the water is saved by 57% or so, the byproduct low-pressure steam is increased by 11% or so, and the energy and water saving effect is remarkable.
The invention is not limited to the above-described alternative embodiments, and any person who may derive other various forms of products in the light of the present invention, however, any changes in shape or structure thereof, all falling within the technical solutions defined in the scope of the claims of the present invention, fall within the scope of protection of the present invention.
Claims (1)
1. A method for recovering heat from a cumene plant, comprising the steps of:
s1: introducing a gas phase flow at the top of the isopropylbenzene tower into the tube side of a steam generator (1), and introducing the fully condensed flow into a benzene feeding primary preheater (31) for cooling;
s2: the raw material benzene stream from the raw material benzene storage tank is fed into a benzene feed primary preheater (31) for preheating;
s3: preheating a feed water stream from an off-boundary boiler, and then introducing the feed water stream into a shell side of a steam generator (1) to produce steam;
in the step S2, the flow preheated by the benzene feeding primary preheater (31) is fed into the benzene feeding secondary preheater (71) to be continuously preheated, the benzene flow is heated, and the heated benzene flow is fed into the benzene feeding protection bed (41) to remove impurities; the refined benzene stream is passed to a benzene feed secondary preheater (71) for heat recovery; in step S2, after preheating the feed benzene stream, passing the feed benzene stream to a benzene feed steam heater (42) for heating;
in step S3, when the boiler feed water stream is preheated, the boiler feed water is led into a boiler feed water preheater (72) for preheating, and the benzene stream after passing through the benzene feed secondary preheater (71) is led into the boiler feed water preheater (72) for heat recovery;
the boiler feed water preheater (72) is positioned at one end of the benzene feed secondary preheater (71) far away from the benzene feed guard bed (41);
in the step S1, introducing the cumene flow cooled by the benzene feeding primary preheater (31) into a cumene cooler (32) for continuous cooling;
the cumene cooler (32) is positioned at one end of the benzene feed primary preheater (31) far away from the steam generator (1);
in step S3, the benzene stream after heat recovery by the boiler feed water preheater (72) is sent to a rectifying column;
in step S1, the cooled cumene is sent to a cumene storage tank.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111432518.9A CN114060789B (en) | 2021-11-29 | 2021-11-29 | Method for recovering heat of cumene device |
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| Application Number | Priority Date | Filing Date | Title |
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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 CN114060789A (en) | 2022-02-18 |
| CN114060789B true CN114060789B (en) | 2023-06-16 |
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Family Cites Families (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 |
| CN109847394B (en) * | 2019-03-28 | 2021-08-10 | 湖北三宁化工股份有限公司 | System and method for recycling process waste heat of ethylene glycol rectification device |
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