CN112113199A - Waste heat recovery system steam system for ethylbenzene apparatus for producing - Google Patents
Waste heat recovery system steam system for ethylbenzene apparatus for producing Download PDFInfo
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- CN112113199A CN112113199A CN202011118290.1A CN202011118290A CN112113199A CN 112113199 A CN112113199 A CN 112113199A CN 202011118290 A CN202011118290 A CN 202011118290A CN 112113199 A CN112113199 A CN 112113199A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/16—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being hot liquid or hot vapour, e.g. waste liquid, waste vapour
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B3/00—Other methods of steam generation; Steam boilers not provided for in other groups of this subclass
- F22B3/04—Other methods of steam generation; Steam boilers not provided for in other groups of this subclass by drop in pressure of high-pressure hot water within pressure- reducing chambers, e.g. in accumulators
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
- F25B15/02—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas
- F25B15/06—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas the refrigerant being water vapour evaporated from a salt solution, e.g. lithium bromide
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/62—Absorption based systems
- Y02B30/625—Absorption based systems combined with heat or power generation [CHP], e.g. trigeneration
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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
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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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
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
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- Life Sciences & Earth Sciences (AREA)
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Abstract
The invention provides a waste heat recovery steam making system for an ethylbenzene production device, which comprises an ethylbenzene production device, a second lithium bromide absorption heat pump unit, a booster pump, a flash tank, a hot water circulating pump, a desalted water-condensed water mixer, a medium-temperature hot water-water supplementing heat exchanger, a circulating water-sewage discharging heat exchanger and a styrene production device, wherein the second lithium bromide absorption heat pump unit is connected with the booster pump; the medium temperature hot water system in the ethylbenzene production device is in conduction connection with an inlet of a second lithium bromide absorption heat pump unit through a pipeline; the water inlet of the booster pump is in conduction connection with the second type lithium bromide absorption heat pump unit through a pipeline, and the water outlet of the booster pump is in conduction connection with a water return pipeline in the medium-temperature hot water system through a pipeline; the invention provides a method for recovering process hot water waste heat and preparing low-pressure steam by an ethylbenzene production device, which aims to solve the problem of low waste heat utilization rate of the production process flow of the existing refining enterprises, effectively reduce the consumption of circulating cooling water and achieve a better use effect.
Description
Technical Field
The invention relates to an ethylbenzene production device, in particular to a waste heat recovery steam making system for the ethylbenzene production device.
Background
Ethylbenzene is an intermediate product in the production of styrene, an important chemical raw material, and is widely used as a monomer for producing rubber, resin and plastics. Currently, 90% of the styrene on the market is produced by ethylbenzene dehydrogenation process. The main method for industrially producing styrene is to use an iron-based catalyst to catalyze the dehydrogenation of ethylbenzene in the environment of a large amount of superheated steam, and the process is limited by thermodynamic equilibrium, has low equilibrium conversion rate, consumes a large amount of energy and has high cost.
At present, a refinery enterprise needs to consume a large amount of 0.25MPaG and 0.35MPaG steam in the production process of styrene, a part of 0.25MPaG and 0.35MPaG steam is generated in the production process for producing styrene, and the insufficient part needs to be supplemented by purchased 1.0MPaG steam with reduced temperature and pressure, so that the energy consumption is large.
In the ethylbenzene production plant, the high-temperature material (above 140 ℃) is generally directly cooled by the cooperation of a heat exchanger and circulating cooling water, and a large amount of hot water with the temperature of about 120 ℃ is generated in the material cooling process. The waste heat cannot be well recycled, so that the utilization rate of the medium-temperature hot water is low, a large amount of circulating cooling water is consumed, and the energy is greatly wasted.
Disclosure of Invention
The invention aims to provide a waste heat recovery steam making system for an ethylbenzene production device, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a waste heat recovery steam making system for an ethylbenzene production device comprises the ethylbenzene production device, a second lithium bromide absorption heat pump unit, a booster pump, a flash tank, a hot water circulating pump, a desalted water-condensed water mixer, a medium-temperature hot water-water supplement heat exchanger, a circulating water-sewage discharge heat exchanger and a styrene production device;
the medium temperature hot water system in the ethylbenzene production device is in conduction connection with an inlet of a second lithium bromide absorption heat pump unit through a pipeline;
the water inlet of the booster pump is in conduction connection with the second type lithium bromide absorption heat pump unit through a pipeline, and the water outlet of the booster pump is in conduction connection with a water return pipeline in the medium-temperature hot water system through a pipeline;
the flash tank is circularly connected with a second lithium bromide absorption heat pump unit through a pipeline; the outlet of the flash tank is communicated with the steam pipe network;
a water inlet of the hot water circulating pump is in conduction connection with the flash tank through a pipeline, and a water outlet of the hot water circulating pump is in conduction connection with the second type lithium bromide absorption heat pump unit through a pipeline;
the outlet of the desalted water-condensed water mixer is in conduction connection with the medium-temperature hot water-replenishing heat exchanger through a pipeline, and the inlet of the desalted water-condensed water mixer is in conduction connection with a desalted water pipe network and a condensed water pipe network respectively;
the water replenishing port of the medium-temperature hot water-water replenishing heat exchanger is in conductive connection with the water outlet of the booster pump, and the water outlet of the medium-temperature hot water-water replenishing heat exchanger is in conductive connection with the water inlet of the booster pump; the heat exchange inlet of the medium-temperature hot water-water replenishing heat exchanger is in conduction connection with the demineralized water-condensed water mixer through a pipeline, and the heat exchange outlet of the medium-temperature hot water-water replenishing heat exchanger is in conduction connection with the flash tank through a pipeline;
the sewage inlet of the circulating water-sewage discharge heat exchanger is in conduction connection with the flash tank through a pipeline, and the sewage outlet of the circulating water-sewage discharge heat exchanger is in conduction connection with a sewage system through a pipeline; the circulating water inlet and the circulating water outlet of the circulating water-sewage heat exchanger are circularly connected with a circulating cooling water system through pipelines;
and the styrene production device is respectively communicated and connected with a steam outlet and a steam pipe network of the ethylbenzene production device.
As a further scheme of the invention: the second type of lithium bromide absorption heat pump unit is formed by mutually matching an evaporator, a generator, a condenser and an absorber.
As a further scheme of the invention: the booster pump is an axially split double-suction pump.
As a further scheme of the invention: the hot water circulating pump is an axially split double-suction pump.
As a further scheme of the invention: the medium-temperature hot water-water replenishing heat exchanger is an all-welded plate type heat exchanger.
As a further scheme of the invention: the circulating water-sewage discharge heat exchanger is an all-welded plate heat exchanger.
Compared with the prior art, the invention has the beneficial effects that:
after the structure is adopted, the low-temperature waste heat can be efficiently recovered, 0.25MPaG or 0.35MPaG steam is generated, the generated steam can be used for a styrene production device, the consumption of the styrene production device for reducing the temperature and the pressure of the 1.0MPaG steam to generate the 0.35MPaG steam is reduced, the consumption of the 1.0MPaG steam is saved, and the consumption of circulating cooling water required by cooling medium-temperature hot water is reduced.
The invention recovers the hot water waste heat of the ethylbenzene production device, uses process hot water at 90-120 ℃ as a driving heat source, adopts a second lithium bromide absorption heat pump to prepare steam of 0.25MPaG or 0.35MPaG, and merges the steam into a steam pipe network of a refining enterprise to meet the steam requirement of the styrene production device of the refining enterprise. By adopting the process, the steam prepared by recovering the waste heat of the process hot water of the ethylbenzene production device is introduced into the styrene device to be used as the steam for reaction, so that the consumption of 1.0MPaG steam can be reduced to the maximum extent, meanwhile, the consumption of the circulating water cooled by the hot water in the ethylbenzene production device is reduced, and further, the consumption of the circulating cooling water in a refinery is reduced.
The invention can directly prepare 0.25MPaG or 0.35MPaG steam, is flexible to use, can directly output steam (the steam dryness reaches more than 98%) with stable pressure and reliable steam quality, and can save a large amount of equipment investment and circulating water pump operating cost for users.
The invention does not consume high-grade energy, the second lithium bromide absorption heat pump unit consumes all low-grade waste heat, and does not consume high-grade energy, the range of the available low-grade waste heat is wider, and the available low-grade waste heat can be waste heat water, low-pressure steam (the pressure can be about 5kPa at the lowest), or other single-component or multi-component gas and liquid.
The invention has short recovery cost period, and the second lithium bromide absorption heat pump unit can produce steam or high-temperature hot water under the condition of not consuming high-grade energy, thereby saving the input of primary energy and having very obvious energy-saving effect.
The invention has remarkable environmental benefit. The second type of lithium bromide absorption heat pump unit basically does not consume electric energy, uses a lithium bromide-water solution, has no pollution and waste in operation, and does not need a place for stacking fuel waste.
The invention ensures the stable operation of the ethylbenzene production device, eliminates the adverse effect of medium-temperature process hot water on the ethylbenzene production device and subsequent styrene production devices, solves the problem of increased circulating cooling water consumption caused by excessive and overlarge water amount of medium-temperature hot water, and further reduces the operation and maintenance cost of the ethylbenzene production device.
The invention can automatically operate, has less operation parts of the second type lithium bromide absorption heat pump unit, simple and reliable unit operation, low maintenance cost and high automatic control degree.
The invention provides a method for recovering process hot water waste heat and preparing low-pressure steam by an ethylbenzene production device, which aims to solve the problem of low waste heat utilization rate of the production process flow of the existing refining enterprises, effectively reduce the consumption of circulating cooling water and achieve a better use effect.
Drawings
Fig. 1 is a schematic diagram of the overall structure of a waste heat recovery steam generation system for an ethylbenzene production plant.
FIG. 2 is a flow chart of a waste heat recovery steam generation system for an ethylbenzene production plant.
FIG. 3 is a front view of a flash tank in a heat recovery steam generation system for an ethylbenzene production plant.
FIG. 4 is a side view of a flash tank in a heat recovery steam generation system for an ethylbenzene production plant.
In the figure: 1. an ethylbenzene production unit; 2. a second type of lithium bromide absorption heat pump unit; 3. a booster pump; 4. a flash tank; 5. a hot water circulation pump; 6. a demineralized water-condensate mixer; 7. medium temperature hot water-water replenishing heat exchanger; 8. a circulating water-sewage heat exchanger; 9. styrene apparatus for producing.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Referring to fig. 1-4, a waste heat recovery steam generation system for an ethylbenzene production device includes an ethylbenzene production device 1, a second type lithium bromide absorption heat pump unit 2, a booster pump 3, a flash tank 4, a hot water circulating pump 5, a demineralized water-condensed water mixer 6, a medium temperature hot water-make water heat exchanger 7, a circulating water-blow-off water heat exchanger 8 and a styrene production device 9;
the medium temperature hot water system in the ethylbenzene production device 1 is connected with the inlet of the second lithium bromide absorption heat pump unit 2 in a conduction way through a pipeline;
the water inlet of the booster pump 3 is in conduction connection with the second type lithium bromide absorption heat pump unit 2 through a pipeline, and the water outlet of the booster pump 3 is in conduction connection with a water return pipeline in the medium-temperature hot water system through a pipeline;
hot water with the temperature of 120 ℃ in the medium-temperature hot water system enters a second lithium bromide absorption heat pump unit 2, the temperature is reduced to 94 ℃ after heat exchange, and then the hot water returns to a water return pipeline in the medium-temperature hot water system through a booster pump 3; wherein, the second type lithium bromide absorption heat pump unit 2 adopts circulating water as a cooling medium, and the pressure drop of the circulating water entering and exiting the second type lithium bromide absorption heat pump unit 2 is about 1 kg. The second type lithium bromide absorption heat pump unit 2 is composed of an evaporator, a generator, a condenser, an absorber and other units. The booster pump 3 adopts an axial split double-suction pump, the flow is large, the lift is high, and the medium-temperature hot water can be smoothly input into a water return pipeline through the booster pump 3 after about 1 kilogram of pressure drop is generated by the second lithium bromide absorption heat pump unit 2.
The flash tank 4 is circularly connected with the second type lithium bromide absorption heat pump unit 2 through a pipeline; the outlet of the flash tank 4 is communicated with the steam pipe network;
a water inlet of the hot water circulating pump 5 is in conduction connection with the flash tank 4 through a pipeline, and a water outlet of the hot water circulating pump 5 is in conduction connection with the second type lithium bromide absorption heat pump unit 2 through a pipeline; the hot water circulating pump 5 adopts an axial split double-suction pump, has large flow and high lift, and ensures that the flash tank 4 and the absorber of the second lithium bromide absorption heat pump unit 2 can normally operate when performing medium-high temperature hot water circulating work.
An outlet of the desalted water-condensed water mixer 6 is in conduction connection with the medium-temperature hot water-supplemented water heat exchanger 7 through a pipeline, and an inlet of the desalted water-condensed water mixer 6 is in conduction connection with a desalted water pipe network and a condensed water pipe network respectively; the demineralized water-condensed water mixer 6 is mixed by a mixing element fixed in the pipe, and the fluid rotates left and right under the action of the mixing element, so that the flowing direction is changed continuously, the central fluid flow is pushed to the periphery, and the peripheral fluid is pushed to the center, thereby the demineralized water and the condensed water are mixed well in a radial direction.
A water replenishing port of the medium-temperature hot water-water replenishing heat exchanger 7 is in conduction connection with a water outlet of the booster pump 3, and a water outlet of the medium-temperature hot water-water replenishing heat exchanger 7 is in conduction connection with a water inlet of the booster pump 3; a heat exchange inlet of the medium-temperature hot water-water replenishing heat exchanger 7 is in conduction connection with the demineralized water-condensed water mixer 6 through a pipeline, and a heat exchange outlet of the medium-temperature hot water-water replenishing heat exchanger 7 is in conduction connection with the flash tank 4 through a pipeline; the medium-temperature hot water-water replenishing heat exchanger 7 is an all-welded plate heat exchanger, has low dirt coefficient, can be detached and washed, has high heat exchange efficiency, fully ensures the heat exchange effect of medium-temperature hot water and water replenishing, and ensures the stable operation of the flash tank 4.
A sewage inlet of the circulating water-sewage discharge heat exchanger 8 is in conduction connection with the flash tank 4 through a pipeline, and a sewage outlet of the circulating water-sewage discharge heat exchanger 8 is in conduction connection with a sewage system through a pipeline; the circulating water inlet and the circulating water outlet of the circulating water-sewage heat exchanger 8 are circularly connected with a circulating cooling water system through pipelines; the circulating water-sewage discharge heat exchanger 8 adopts an all-welded plate type heat exchanger, has low dirt coefficient, can be detached and washed, has high heat exchange efficiency, ensures the heat exchange effect of the sewage discharge water of the flash tank 4 and the circulating water of the second lithium bromide absorption heat pump unit 2, and fully utilizes heat.
And the styrene production device 9 is respectively communicated with a steam outlet of the ethylbenzene production device 1 and a steam pipe network. The styrene production device 9 is connected with an outlet steam pipeline of the ethylbenzene production device 1 through a pipeline and is connected with a 0.25MPaG or 0.35MPaG steam pipe network prepared by the second lithium bromide absorption heat pump unit 2. Wherein the 1.0MPaG steam is generally used for temperature and pressure reduction in the styrene production unit 9.
The flash tank 4 is a container for changing high-pressure saturated water from the second type lithium bromide absorption heat pump unit 2 into low-pressure saturated steam and saturated water. The high pressure saturated water enters the relatively low pressure vessel and is converted to a portion of the saturated vapor and water at the vessel pressure by the sudden drop in pressure. Because the water flow is large, in order to avoid that the medium in the pipe is directly sprayed to the barrel to cause the flash tank 4 to shake, a liquid distribution pipeline (a circulating water connecting pipe) is designed in the tank to slow down the impact force of the internal medium on the barrel, so that the medium can uniformly descend to the bottom of the barrel through the liquid distribution pipe; in order to prevent the generated steam from entraining liquid drops, a defoaming device is designed at the position of the steam outlet of the flash tank. The steam which generates 0.25MPaG or 0.35MPaG is merged into a steam pipe network through a pressure control valve for the styrene production device 9 to use, thereby ensuring the stable operation of each production device, not causing influence on the production of the ethylbenzene production device 1 and not influencing the medium temperature hot water system of the whole plant.
The steam generation amount of the second lithium bromide absorption heat pump unit 2 is related to a plurality of factors and parameters such as unit operation condition, low-temperature hot water supply amount and temperature, circulating water supply temperature and the like. The whole system is controlled by a DCS upper computer system, and displays operation state, temperature, pressure, flow, valve opening, pump frequency, liquid level, operation time, starting and stopping times and other operation data in real time. The collected analog data curve, the historical record analysis and processing, the log record processing, the statistical report of the alarm record, the statistical analysis report of the accident memory and the like are displayed, and the assistance is provided for rapidly solving the fault. Meanwhile, the safe and stable operation of the whole system is ensured.
In this embodiment, it should be noted that the ethylbenzene production device 1, the styrene production device 9, the medium-temperature hot water system, the circulating cooling water system, the steam pipe network, and the like adopted in this application are all the prior art, and the connections between the components are also all the prior art, so the connection relationship and principle thereof are not described herein again.
The working principle of the invention is as follows:
cooling a medium-high temperature material (above 140 ℃) of the ethylbenzene production device 1 by a heat exchanger and circulating cooling water, and generating a large amount of hot water with the temperature of about 90-120 ℃ in the material cooling process; the medium-temperature hot water (90-120 ℃) generated by the ethylbenzene production device 1 is used as a medium-temperature heat source of the second lithium bromide absorption heat pump unit 2. The medium-temperature hot water from the ethylbenzene production device 1 enters the second type lithium bromide absorption heat pump unit 2 through a pipeline, and the medium-temperature hot water from the ethylbenzene production device 1 is recovered by the second type lithium bromide absorption heat pump unit 2, so that the usage amount of circulating cooling water is saved.
After heat exchange is carried out by the second type lithium bromide absorption heat pump unit 2, hot water with the temperature of 70-94 ℃ is sent back to a water return pipeline of the medium-temperature hot water system by the booster pump 3 through a pipeline; the high-temperature water outlet after the heat exchange of the second lithium bromide absorption heat pump unit 2 enters the flash tank 4 through a pipeline to prepare steam, the flash tank 4 adopts desalted water to prepare 0.25MPaG or 0.35MPaG steam, and the steam is merged into a 0.25MPaG or 0.35MPaG steam pipe network through a pressure control valve (steam valve) to be used by the styrene production device 9, so that the steam amount of reducing the temperature and the pressure of 1.0MPaG to 0.25MPaG or 0.35MPaG in the styrene production device 9 is saved.
Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.
Claims (6)
1. A waste heat recovery steam making system for an ethylbenzene production device is characterized by comprising an ethylbenzene production device (1), a second lithium bromide absorption heat pump unit (2), a booster pump (3), a flash tank (4), a hot water circulating pump (5), a desalted water-condensed water mixer (6), a medium temperature hot water-water replenishing heat exchanger (7), a circulating water-sewage heat exchanger (8) and a styrene production device (9);
the medium-temperature hot water system in the ethylbenzene production device (1) is in conduction connection with an inlet of a second lithium bromide absorption heat pump unit (2) through a pipeline;
the water inlet of the booster pump (3) is in conduction connection with the second type lithium bromide absorption heat pump unit (2) through a pipeline, and the water outlet of the booster pump (3) is in conduction connection with a water return pipeline in the medium-temperature hot water system through a pipeline;
the flash tank (4) is circularly connected with the second type lithium bromide absorption heat pump unit (2) through a pipeline; the outlet of the flash tank (4) is communicated with the steam pipe network;
a water inlet of the hot water circulating pump (5) is in conduction connection with the flash tank (4) through a pipeline, and a water outlet of the hot water circulating pump (5) is in conduction connection with the second type lithium bromide absorption heat pump unit (2) through a pipeline;
an outlet of the desalted water-condensed water mixer (6) is in conduction connection with the medium-temperature hot water-supplemented water heat exchanger (7) through a pipeline, and an inlet of the desalted water-condensed water mixer (6) is in conduction connection with a desalted water pipe network and a condensed water pipe network respectively;
a water replenishing port of the medium-temperature hot water-water replenishing heat exchanger (7) is in conduction connection with a water outlet of the booster pump (3), and a water outlet of the medium-temperature hot water-water replenishing heat exchanger (7) is in conduction connection with a water inlet of the booster pump (3); a heat exchange inlet of the medium-temperature hot water-water replenishing heat exchanger (7) is in conduction connection with the demineralized water-condensed water mixer (6) through a pipeline, and a heat exchange outlet of the medium-temperature hot water-water replenishing heat exchanger (7) is in conduction connection with the flash tank (4) through a pipeline;
a sewage inlet of the circulating water-sewage water heat exchanger (8) is in conduction connection with the flash tank (4) through a pipeline, and a sewage outlet of the circulating water-sewage water heat exchanger (8) is in conduction connection with a sewage system through a pipeline; a circulating water inlet and a circulating water outlet of the circulating water-sewage heat exchanger (8) are circularly connected with a circulating cooling water system through pipelines;
and the styrene production device (9) is respectively communicated and connected with the steam outlet of the ethylbenzene production device (1) and the steam pipe network.
2. The system for recycling waste heat to produce steam for the ethylbenzene production device according to claim 1, wherein the second type of lithium bromide absorption heat pump unit (2) is formed by an evaporator, a generator, a condenser and an absorber which are matched with each other.
3. The system for recycling waste heat to generate steam for the ethylbenzene production plant according to claim 1, wherein the booster pump (3) is an axially split double suction pump.
4. The system for recycling heat and generating steam for the ethylbenzene production plant according to claim 1, wherein the hot water circulating pump (5) is an axially split double suction pump.
5. The system for recycling waste heat to produce steam for the ethylbenzene production device according to claim 1, wherein the medium-temperature hot water-make-up water heat exchanger (7) is an all-welded plate heat exchanger.
6. The system for recycling the waste heat to produce the steam for the ethylbenzene production device according to claim 1, wherein the circulating water-sewage heat exchanger (8) is a full-welded plate heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011118290.1A CN112113199A (en) | 2020-10-19 | 2020-10-19 | Waste heat recovery system steam system for ethylbenzene apparatus for producing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011118290.1A CN112113199A (en) | 2020-10-19 | 2020-10-19 | Waste heat recovery system steam system for ethylbenzene apparatus for producing |
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| CN112113199A true CN112113199A (en) | 2020-12-22 |
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| CN202011118290.1A Pending CN112113199A (en) | 2020-10-19 | 2020-10-19 | Waste heat recovery system steam system for ethylbenzene apparatus for producing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114484397A (en) * | 2022-01-13 | 2022-05-13 | 北京欧谊德科技有限公司 | Low-temperature heat utilization method for aromatic hydrocarbon combination device |
-
2020
- 2020-10-19 CN CN202011118290.1A patent/CN112113199A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114484397A (en) * | 2022-01-13 | 2022-05-13 | 北京欧谊德科技有限公司 | Low-temperature heat utilization method for aromatic hydrocarbon combination device |
| CN114484397B (en) * | 2022-01-13 | 2023-11-28 | 北京欧谊德科技有限公司 | Low-temperature heat utilization method of aromatic hydrocarbon combination device |
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