CN115074160B - Benzene washing system - Google Patents
Benzene washing system Download PDFInfo
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- CN115074160B CN115074160B CN202210802970.8A CN202210802970A CN115074160B CN 115074160 B CN115074160 B CN 115074160B CN 202210802970 A CN202210802970 A CN 202210802970A CN 115074160 B CN115074160 B CN 115074160B
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- chamber
- heat exchanger
- benzene washing
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- washing tower
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/08—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors
- C10K1/16—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with non-aqueous liquids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels
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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
Abstract
The invention discloses a benzene washing system, wherein a gas inlet is formed in the bottom of a first benzene washing tower, the top of the first benzene washing tower is communicated with the bottom of a second benzene washing tower through a gas pipeline, a gas outlet is formed in the top of the second benzene washing tower, an oil inlet at the top of the second benzene washing tower is communicated with a lean oil pipe, the bottom of the second benzene washing tower is communicated with the top of the first benzene washing tower through a semi-rich oil pipe, an oil outlet is formed in the bottom of the first benzene washing tower, a lean oil heat exchanger is arranged on the lean oil pipe, a first outlet for a first cooling medium to flow out is formed in the lean oil heat exchanger, a semi-rich oil heat exchanger is arranged on the semi-rich oil pipe, a first inlet and a second inlet are formed in the semi-rich oil heat exchanger, the first inlet is communicated with the first outlet through a first pipeline, and the second inlet is used for introducing a second cooling medium. The first cooling medium flowing out of the lean oil heat exchanger is introduced into the semi-rich oil heat exchanger for heat supplement, so that the existing rich residual heat can be directly utilized for the second time, and the benzene washing cost of coal gas is reduced.
Description
Technical Field
The invention relates to the field of gas purification, in particular to a benzene washing system.
Background
Crude benzene is used as a byproduct in the coking process, has the characteristics of water insolubility, flammability, explosiveness, easy poisoning and the like, and is a mixture composed of a plurality of organic matters. Crude benzene can be synthesized into substances such as acetone, phenol and the like. Products such as toluene, dimethylbenzene, pure benzene and the like are prepared from crude benzene through fine processing, and are important chemical raw materials. The recovery of crude benzene in coke oven gas can purify the coke oven gas to obtain crude benzene with more economic value. The current method for recovering crude benzene with highest cost performance is a wash oil absorption method.
Referring to fig. 1, the gas from the final cooling tower enters from the bottom of the first benzene washing tower 1 ', is discharged from the top of the first benzene washing tower 1', enters the bottom of the second benzene washing tower 2 ', and is discharged from the top of the second benzene washing tower 2'. The lean oil is cooled by a lean oil heat exchanger 3 'and then sent to the top of a second benzene washing tower 2' to be sprayed, the lean oil is reversely contacted with coal gas, benzene in the lean oil is absorbed and then is converted into semi-rich oil, the semi-rich oil flows out from the bottom of the second benzene washing tower 2 'and then is sent to the top of a first benzene washing tower 1', the semi-rich oil is sprayed, benzene in the semi-rich oil is absorbed and then is converted into rich oil, and the rich oil flows out from the bottom of the first benzene washing tower 1 'and then is sent to a distillation system to debenzolization through a rich oil pump 5'.
Because the second benzene washing tower 2 'has higher internal temperature, in order to ensure the benzene absorption effect of the semi-rich oil in the first benzene washing tower 1', the semi-rich oil needs to be cooled to 25 ℃ by using the semi-rich oil heat exchanger 4 ', so that the semi-rich oil can be introduced into the first benzene washing tower 1'.
When the environmental temperature is higher than 25 ℃, the heat dissipation capacity of the semi-rich heat exchanger 4 ' is small, low-temperature water (16 ℃) can be adopted to cool the semi-rich heat exchanger 4 ', so that the heat dissipation of the semi-rich oil is promoted, however, when the environmental temperature is lower than 25 ℃ in rainy weather (or winter low-temperature weather), the heat dissipation capacity of the semi-rich heat exchanger 4 ' is large, so that the cooling temperature of the semi-rich oil is greatly reduced, the semi-rich oil temperature is still lower than 25 ℃ under the state that low-temperature water is not introduced, the semi-rich oil temperature is lower than the temperature of gas after final cooling, the rich oil is brought with water, the process stability of a crude benzene distillation system is destroyed, and the benzene washing efficiency of the gas is reduced. When the semi-rich oil temperature is lower than 25 ℃, the fluidity of the semi-rich oil is poor, so that slag is easy to accumulate in the semi-rich oil heat exchanger 4', the circulating wash oil flow is reduced, the semi-rich oil temperature is forced to be increased, benzene in the wash oil absorption gas is finally influenced, and the benzene washing effect is poor.
Disclosure of Invention
The aim of the embodiment of the invention is that: provided is a benzene washing system capable of reducing semi-rich oil temperature fluctuation and improving benzene washing effect.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the utility model provides a benzene washing system, including first benzene washing tower, second benzene washing tower, lean oil pipe and half rich oil pipe, the bottom of first benzene washing tower is provided with the coal gas entry, the top of first benzene washing tower with the bottom of second benzene washing tower is through gas pipeline intercommunication, the top of second benzene washing tower is provided with the coal gas export, the oil entry at second benzene washing tower top with lean oil pipe intercommunication, the bottom of second benzene washing tower is through half rich oil pipe with the top intercommunication of first benzene washing tower, the bottom of first benzene washing tower is provided with the oil export, be provided with the lean oil heat exchanger on the lean oil pipe, be provided with the first export that supplies the first cooling medium flows out on the lean oil heat exchanger, be provided with half rich oil heat exchanger on the half rich oil heat exchanger, first entry and second entry through first pipeline with the first export, the second entry is used for the second cooling medium is used for the second temperature is less than the first cooling medium intercommunication in the first cooling medium.
As a preferable scheme of the benzene washing system, the semi-rich oil heat exchanger comprises a heat exchanger body and a first distribution box, wherein a first chamber, a second chamber and a third chamber are arranged in the first distribution box, the third chamber is respectively communicated with the first chamber and the second chamber, the cavity wall of the first chamber is provided with a first inlet, the cavity wall of the second chamber is provided with a second inlet, the cavity wall of the third chamber is provided with a second outlet, and the second outlet is communicated with the inlet of the heat exchanger body.
As a preferable mode of the benzene washing system, the first chamber and the third chamber are communicated through a first one-way valve, and the first cooling medium in the first chamber flows into the third chamber through the first one-way valve;
the second chamber is communicated with the third chamber through a second one-way valve, and the second cooling medium in the second chamber flows into the third chamber through the second one-way valve.
As a preferable scheme of the benzene washing system, the semi-rich oil heat exchanger further comprises a second distribution box, a fourth chamber, a fifth chamber and a sixth chamber are arranged in the second distribution box, a third inlet is formed in the cavity wall of the fourth chamber, the third inlet is communicated with the outlet of the heat exchanger body, a third outlet and a fourth outlet are respectively formed in the cavity wall of the fifth chamber and the cavity wall of the sixth chamber, the fourth chamber is communicated with the fifth chamber through a third one-way valve, the fourth chamber is communicated with the sixth chamber through a fourth one-way valve, cooling medium in the fourth chamber flows into the fifth chamber through the third one-way valve, and cooling medium in the fourth chamber flows into the sixth chamber through the fourth one-way valve.
As a preferable scheme of the benzene washing system, a first valve is arranged on the first pipeline, and a second valve is arranged at the second inlet.
As a preferable scheme of the benzene washing system, the benzene washing system comprises a remote control module, wherein the remote control module is electrically connected with the first valve and the second valve respectively.
As a preferable scheme of the benzene washing system, a temperature sensor is arranged on the semi-rich oil pipe and used for detecting the temperature of the semi-rich oil entering the first benzene washing tower, and the temperature sensor is electrically connected with the remote control module.
As a preferable scheme of the benzene washing system, a cooling heat exchanger is further arranged on the lean oil pipe, and the cooling heat exchanger is positioned between the lean oil heat exchanger and the second benzene washing tower.
As a preferred embodiment of the benzene washing system, the temperature of the third cooling medium flowing in the cooling heat exchanger is lower than the temperature of the first cooling medium.
As a preferable scheme of the benzene washing system, the third outlet of the semi-rich oil heat exchanger is communicated with the lean oil heat exchanger through a second pipeline, and a cooler is arranged on the second pipeline.
The beneficial effects of the invention are as follows: when the ambient temperature is lower, the heat dissipation capacity of the semi-rich heat exchanger is higher, the first cooling medium can supplement heat to the semi-rich heat exchanger, so that the temperature of the semi-rich oil entering the first benzene washing tower can be in a proper temperature range, when the ambient temperature is higher, the heat dissipation capacity of the semi-rich heat exchanger is smaller, and the second cooling medium can be only introduced into the semi-rich heat exchanger, so that the temperature of the semi-rich oil entering the first benzene washing tower is ensured not to be excessively high; the first cooling medium flowing out of the lean oil heat exchanger is introduced into the semi-rich oil heat exchanger for heat supplement, so that the existing rich residual heat can be directly utilized for the second time, and the benzene washing cost of coal gas is reduced.
Drawings
The invention is described in further detail below with reference to the drawings and examples.
FIG. 1 is a schematic diagram of a benzene washing system according to the prior art.
FIG. 2 is a schematic diagram of a benzene washing system according to an embodiment of the present invention.
Fig. 3 is a schematic view of a first distribution box according to an embodiment of the present invention.
In fig. 1:
1', a first benzene washing tower; 2', a second benzene washing tower; 3', a lean oil heat exchanger; 4', a semi-rich oil heat exchanger; 5', an oil-rich pump;
fig. 2 to 3:
1. a first benzene washing tower; 2. a second benzene washing tower; 3. a lean oil heat exchanger; 4. a semi-rich heat exchanger; 41. a heat exchanger body; 42. a first distribution box; 421. a first chamber; 422. a second chamber; 423. a third chamber; 424. a first one-way valve; 425. a second one-way valve; 426. a first inlet; 427. a second inlet; 428. a second outlet; 43. a second distribution box; 5. a first pipeline; 6. a first valve; 7. a second valve; 8. a third valve; 9. a fourth valve; 10. a remote control module; 11. a gas pipe; 12. a semi-rich oil pipe; 13. lean oil pipe; 14. a semi-rich oil pump; 15. cooling the heat exchanger; 16. and a rich oil pump.
Detailed Description
In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 2 and 3, the benzene washing system provided by the invention comprises a first benzene washing tower 1, a second benzene washing tower 2, a lean oil pipe 13 and a semi-rich oil pipe 12, wherein a gas inlet is formed in the bottom of the first benzene washing tower 1, the top of the first benzene washing tower 1 is communicated with the bottom of the second benzene washing tower 2 through a gas pipe 11, a gas outlet is formed in the top of the second benzene washing tower 2, an oil inlet at the top of the second benzene washing tower 2 is communicated with the lean oil pipe 13, the bottom of the second benzene washing tower 2 is communicated with the top of the first benzene washing tower 1 through a semi-rich oil pipe 12, an oil outlet is formed in the bottom of the first benzene washing tower 1, a lean oil heat exchanger 3 is arranged on the lean oil pipe 13, a flowing first cooling medium is arranged in the lean oil heat exchanger 3, a first outlet for the first cooling medium to flow out is formed in the lean oil heat exchanger 3, a semi-rich oil heat exchanger 4 is arranged on the semi-rich oil pipe 12, a first inlet 426 and a second inlet 427 are formed in the semi-rich heat exchanger 4, the bottom of the second benzene washing tower 2 is communicated with the top of the first benzene washing tower 1 through the first inlet 5 and the second inlet 5, the first inlet is communicated with the second cooling medium 5, and the first cooling medium is cooled down to the first medium 5. In this embodiment, the gas is introduced from the gas inlet at the bottom of the first benzene washing tower 1, then flows out from the top of the first benzene washing tower 1, enters the bottom of the second benzene washing tower 2 through the gas pipe 11, finally flows out from the gas outlet at the top of the second benzene washing tower 2, and the gas flows in opposite directions to the lean oil and the semi-rich oil, and the semi-rich oil flowing out from the second benzene washing tower 2 has a temperature higher than 28 ℃ because of the higher temperature in the second benzene washing tower 2, and the semi-rich oil heat exchanger 4 can cool the semi-rich oil, so that the semi-rich oil temperature introduced into the first benzene washing tower 1 is within a temperature range of 25 ℃ to 28 ℃. In this embodiment, the second benzene washing tower 2 is fed with the rich oil from the outflow side through the rich oil pump 16 to the distillation system to debenzolize and obtain lean oil, the lean oil is re-injected into the second benzene washing tower 2 through the lean oil pipe 13 to realize the recycling of the lean oil, and the lean oil obtained by the debenzolization of the distillation system has a higher temperature (about 105 ℃), so that the lean oil needs to be cooled by using the lean oil heat exchanger 3 to ensure that the temperature of the lean oil introduced by the oil inlet at the top of the second benzene washing tower 2 is within the temperature range of 25-28 ℃. In this embodiment, the first cooling medium and the lean oil exchange heat in the lean oil heat exchanger 3, so that the temperature of the first cooling medium flowing out of the lean oil heat exchanger 3 is higher, the temperature of the first cooling medium is 80-90 ℃, the temperature of the second cooling medium is about 16 ℃, when the ambient temperature is lower, the heat dissipation capacity of the semi-rich oil heat exchanger 4 is larger, the first cooling medium can supplement heat to the semi-rich oil heat exchanger 4, so that the temperature of the semi-rich oil entering the first benzene washing tower 1 can be in the temperature range of 25-28 ℃, when the ambient temperature is higher, the heat dissipation capacity of the semi-rich oil heat exchanger 4 is smaller, at this time, the second cooling medium can be only introduced into the semi-rich oil heat exchanger 4, and the temperature of the semi-rich oil entering the first benzene washing tower 1 is ensured to be not higher than 28 ℃; the first cooling medium flowing out of the lean oil heat exchanger 3 is introduced into the semi-rich oil heat exchanger 4 for heat supplement, so that the existing rich residual heat can be directly reused, and the benzene washing cost of coal gas is reduced.
Specifically, the semi-rich heat exchanger 4 includes a heat exchanger body 41 and a first distribution box 42, a first chamber 421, a second chamber 422 and a third chamber 423 are provided in the first distribution box 42, the third chamber 423 is respectively communicated with the first chamber 421 and the second chamber 422, a cavity wall of the first chamber 421 is provided with a first inlet 426, a cavity wall of the second chamber 422 is provided with a second inlet 427, a cavity wall of the third chamber 423 is provided with a second outlet 428, and the second outlet 428 is communicated with an inlet of the heat exchanger body 41. By providing the first chamber 421, the second chamber 422 and the third chamber 423, when the first cooling medium and the second cooling medium are injected into the semi-rich heat exchanger 4 at the same time, the first cooling medium and the second cooling medium can be sufficiently mixed in the third chamber 423, so that the temperature of the cooling medium introduced into the heat exchanger body 41 is uniform, and the heat exchange effect is improved.
In this embodiment, the first cooling medium and the second cooling medium are both cooling water, and the first cooling medium and the second cooling medium have the same composition and differ only in temperature.
In an embodiment, the first valve 6 is disposed at the first inlet 426, the second valve 7 is disposed at the second inlet 427, and the amounts of the first cooling medium and the second cooling medium can be controlled by the first valve 6 and the second valve 7, so as to control the temperature of the semi-rich oil entering the first benzene washing tower 1, when the ambient temperature is higher, the first valve 6 can be closed, the semi-rich oil can be cooled only by the second cooling medium, when the ambient temperature is lower, the first valve 6 can be opened, so that the first cooling medium flowing out of the lean oil heat exchanger 3 heats the semi-rich oil heat exchanger 4, and the temperature of the semi-rich oil can be ensured.
Specifically, the benzene washing system comprises a remote control module 10, and the remote control module 10 is electrically connected with the first valve 6 and the second valve 7 respectively. By providing the remote control module 10, the operations of the first valve 6 and the second valve 7 can be remotely controlled, and the workload of workers can be reduced.
Specifically, the semi-rich pipe 12 is provided with a temperature sensor for detecting the temperature of the semi-rich oil entering the first benzene washing tower 1, and the temperature sensor is electrically connected with the remote control module 10. By providing a temperature sensor, when the temperature sensor detects that the semi-rich oil temperature deviates from the temperature range of 25-28 ℃, the remote control module 10 can call for manual adjustment of the first valve 6 and the second valve 7, and of course, a program can be set so that the remote control module 10 can also automatically control the first valve 6 and the second valve 7.
In an embodiment, the first cooling medium and the second cooling medium have different compositions, so as to avoid mixing of the first cooling medium and the second cooling medium, the first chamber 421 and the third chamber 423 are communicated through the first check valve 424, and the first cooling medium in the first chamber 421 flows into the third chamber 423 through the first check valve 424; the second chamber 422 and the third chamber 423 are communicated with each other through a second check valve 425, and the second cooling medium in the second chamber 422 flows into the third chamber 423 through the second check valve 425. When the ambient temperature is higher, the heat dissipation capacity of the semi-rich oil heat exchanger 4 is smaller, and only the second cooling medium and the semi-rich oil are required to exchange heat, at this time, the first valve 6 is closed, the second valve 7 is opened, the second cooling medium enters the second chamber 422 from the second inlet 427 and then enters the third chamber 423 through the second one-way valve 425, and since the first one-way valve 424 is arranged between the third chamber 423 and the first chamber 421, the second cooling medium cannot enter the first chamber 421, and the second cooling medium can only flow into the heat exchanger body 41 through the second outlet 428 of the third chamber 423; when the ambient temperature is low, the heat exchanger body 41 needs to be heated, at this time, the first valve 6 is opened, the second valve 7 is closed, the first cooling medium flowing out of the first outlet of the lean oil heat exchanger 3 flows into the first chamber 421 from the first inlet 426, flows into the third chamber 423 through the first one-way valve 424, and cannot enter the second chamber 422 because the second one-way valve 425 is arranged between the third chamber 423 and the second chamber 422, and only flows into the heat exchanger body 41 through the second outlet 428 of the third chamber 423, thereby raising the temperature of the heat exchanger body 41 and avoiding the excessively low temperature of the semi-rich oil; when the first cooling medium is introduced into the first chamber 421, the pressure in the third chamber 423 is increased, the second one-way valve 425 is automatically closed, the residual second cooling medium in the second chamber 422 cannot enter the third chamber 423, and the second cooling medium is introduced into the second chamber 422 in the same way, so that the problem that the water quality is affected by mixing of the first cooling medium and the second cooling medium when the water inlet pipeline is switched is further avoided.
In this embodiment, the semi-rich heat exchanger 4 further includes a second distribution box 43, a fourth chamber, a fifth chamber and a sixth chamber are disposed in the second distribution box 43, a third inlet is disposed on a wall of the fourth chamber, the third inlet is communicated with an outlet of the heat exchanger body 41, a third outlet and a fourth outlet are disposed on walls of the fifth chamber and the sixth chamber, the fourth chamber is communicated with the fifth chamber through a third check valve, the fourth chamber is communicated with the sixth chamber through a fourth check valve, a cooling medium in the fourth chamber flows into the fifth chamber through the third check valve, a cooling medium in the fourth chamber flows into the sixth chamber through the fourth check valve, a third valve 8 is disposed at the third outlet, a fourth valve 9 is disposed at the fourth outlet, and the third valve 8 and the fourth valve 9 are electrically connected with the remote control module 10, respectively. When the ambient temperature is higher, only the second cooling medium is required to be introduced into the semi-rich heat exchanger 4, at this time, the first valve 6 and the third valve 8 are closed, the second valve 7 and the fourth valve 9 are opened, when the ambient temperature is lower, the first cooling medium is required to heat the heat exchanger body 41, at this time, the first valve 6 and the third valve 8 are opened, and the second valve 7 and the fourth valve 9 are closed, so that the mixing of the first cooling medium and the second cooling medium can be avoided, the first cooling medium and the second cooling medium can flow out from different outlets respectively, and the recovery treatment of the first cooling medium and the second cooling medium is facilitated; in this embodiment, flanges are disposed at the first inlet 426, the second inlet 427, the third inlet, the second outlet 428, the third outlet and the fourth outlet, so as to facilitate the fixed connection between the pipelines.
Specifically, the lean oil pipe 13 is further provided with a cooling heat exchanger 15, and the cooling heat exchanger 15 is positioned between the lean oil heat exchanger 3 and the second benzene washing tower 2. In this embodiment, the temperature of the lean oil is relatively high (about 105 ℃), and it is difficult to reduce the temperature of the lean oil to the temperature range of 25-28 ℃ only by the lean oil heat exchanger 3, and the cooling heat exchanger 15 is provided, so that the lean oil can be further cooled, thereby ensuring that the temperature of the lean oil fed into the second benzene washing tower 2 is in the temperature range of 25-28 ℃.
Specifically, in the present embodiment, the temperature of the third cooling medium flowing in the cooling heat exchanger 15 is about 16 ℃.
Specifically, the third outlet of the semi-rich oil heat exchanger 4 is communicated with the lean oil heat exchanger 3 through a second pipeline, and a cooler is arranged on the second pipeline. Through setting up second pipeline intercommunication semi-rich heat exchanger 4 and lean oil heat exchanger 3, can realize the cyclic utilization of first cooling medium, in this embodiment, the first cooling medium normal atmospheric temperature of leading in lean oil heat exchanger 3, the temperature of first cooling medium is about 25 ℃, can reduce the temperature of first cooling medium to normal atmospheric temperature through the heat dissipation of second pipeline pipe wall self, also can carry out supplementary heat dissipation to first cooling medium through the cooler. When the first valve 6 is closed, the first cooling medium may flow directly to the second conduit.
Specifically, the half-rich pipe 12 is provided with a half-rich pump 14. By providing the half-rich oil pump 14, the half-rich oil in the half-rich oil pipe 12 can be provided with flowing power, so that the half-rich oil in the half-rich oil pipe 12 can flow to the top of the first benzene washing tower 1; the semi-rich oil pump 14 is arranged, so that the arrangement difficulty of the first benzene washing tower 1 and the second benzene washing tower 2 can be reduced, for example, the first benzene washing tower 1 and the second benzene washing tower 2 can be arranged on the same plane, and no height limitation exists between the first benzene washing tower 1 and the second benzene washing tower 2.
In the description herein, it should be understood that the terms "upper," "lower," "left," "right," and the like are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and to simplify the operation, rather than to indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for providing a special meaning.
In the description herein, reference to the term "one embodiment," "an example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.
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 the foregoing embodiments, and that the embodiments described in the foregoing embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.
The technical principle of the present invention is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the invention and should not be taken in any way as limiting the scope of the invention. Other embodiments of the invention will be apparent to those skilled in the art from consideration of this specification without undue burden.
Claims (7)
1. The benzene washing system comprises a first benzene washing tower, a second benzene washing tower, a lean oil pipe and a semi-rich oil pipe, wherein a gas inlet is formed in the bottom of the first benzene washing tower, the top of the first benzene washing tower is communicated with the bottom of the second benzene washing tower through a gas pipeline, a gas outlet is formed in the top of the second benzene washing tower, an oil inlet at the top of the second benzene washing tower is communicated with the lean oil pipe, the bottom of the second benzene washing tower is communicated with the top of the first benzene washing tower through the semi-rich oil pipe, an oil outlet is formed in the bottom of the first benzene washing tower, a lean oil heat exchanger is arranged on the lean oil pipe, a first cooling medium flowing out of the lean oil heat exchanger is arranged in the lean oil heat exchanger, and a semi-rich oil heat exchanger is arranged on the semi-rich oil pipe, and is characterized in that a first inlet and a second inlet are formed in the semi-rich oil heat exchanger, the first inlet is communicated with the first medium cooling medium at a low temperature through the first inlet and the second cooling medium inlet;
the semi-rich oil heat exchanger comprises a heat exchanger body and a first distribution box, wherein a first chamber, a second chamber and a third chamber are arranged in the first distribution box, the third chamber is respectively communicated with the first chamber and the second chamber, the cavity wall of the first chamber is provided with a first inlet, the cavity wall of the second chamber is provided with a second inlet, the cavity wall of the third chamber is provided with a second outlet, and the second outlet is communicated with the inlet of the heat exchanger body;
the first chamber is communicated with the third chamber through a first one-way valve, and the first cooling medium in the first chamber flows into the third chamber through the first one-way valve;
the second chamber is communicated with the third chamber through a second one-way valve, and the second cooling medium in the second chamber flows into the third chamber through the second one-way valve;
the semi-rich oil heat exchanger further comprises a second distribution box, a fourth chamber, a fifth chamber and a sixth chamber are arranged in the second distribution box, a third inlet is formed in the cavity wall of the fourth chamber, the third inlet is communicated with the outlet of the heat exchanger body, a third outlet and a fourth outlet are respectively formed in the cavity wall of the fifth chamber and the cavity wall of the sixth chamber, the fourth chamber is communicated with the fifth chamber through a third one-way valve, the fourth chamber is communicated with the sixth chamber through a fourth one-way valve, cooling medium in the fourth chamber flows into the fifth chamber through the third one-way valve, and cooling medium in the fourth chamber flows into the sixth chamber through the fourth one-way valve.
2. The benzene washing system of claim 1, wherein the first pipeline is provided with a first valve, and the second inlet is provided with a second valve.
3. The benzene washing system of claim 2, comprising a remote control module electrically connected to the first valve and the second valve, respectively.
4. The benzene washing system of claim 3, wherein a temperature sensor is disposed on the semi-rich pipe, the temperature sensor being configured to detect a temperature of the semi-rich oil entering the first benzene washing tower, the temperature sensor being electrically connected to the remote control module.
5. The benzene wash system of claim 1, wherein a cooling heat exchanger is further disposed on the lean oil pipe, the cooling heat exchanger being located between the lean oil heat exchanger and the second benzene wash tower.
6. The benzene washing system of claim 5, wherein a temperature of a third cooling medium flowing within the cooling heat exchanger is lower than a temperature of the first cooling medium.
7. The benzene washing system of claim 1, wherein the third outlet of the semi-rich heat exchanger is in communication with the lean heat exchanger via a second line, and a desuperheater is disposed on the second line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210802970.8A CN115074160B (en) | 2022-07-07 | 2022-07-07 | Benzene washing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210802970.8A CN115074160B (en) | 2022-07-07 | 2022-07-07 | Benzene washing system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115074160A CN115074160A (en) | 2022-09-20 |
| CN115074160B true CN115074160B (en) | 2023-08-01 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206385105U (en) * | 2017-01-05 | 2017-08-08 | 马龙县明龙焦化实业有限公司 | A kind of coke-stove gas efficiently elutes benzene series system |
| CN211522136U (en) * | 2020-01-09 | 2020-09-18 | 曲靖市盛凯焦化有限责任公司 | High-efficient recovery unit of coke oven raw gas crude benzol |
| WO2021097905A1 (en) * | 2019-11-19 | 2021-05-27 | 南京华电节能环保设备有限公司 | Recycling device for high-temperature sensible heat of raw coke oven gas in coke oven ascension pipe |
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| NL130632C (en) * | 1965-03-12 | |||
| CN101314810A (en) * | 2008-06-19 | 2008-12-03 | 广东世创金属科技有限公司 | Residual heat utilization and pre-heating temperature elevation system of heat treatment furnace |
| CN209974661U (en) * | 2019-05-22 | 2020-01-21 | 邢台旭阳煤化工有限公司 | Waste heat recovery device and coking crude benzene hydrogenation system |
| CN210374710U (en) * | 2019-07-04 | 2020-04-21 | 厦门热工环保系统工程有限公司 | Heat exchanger |
| CN113105922B (en) * | 2021-04-16 | 2021-12-07 | 广东韶钢松山股份有限公司 | Coke oven gas final cooling system |
| CN215560098U (en) * | 2021-06-16 | 2022-01-18 | 淮北矿业股份有限公司 | Benzene washing tower filler device |
| CN113999703A (en) * | 2021-10-28 | 2022-02-01 | 宣化钢铁集团有限责任公司 | System and process for efficiently eluting benzene hydrocarbon in coke oven gas |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206385105U (en) * | 2017-01-05 | 2017-08-08 | 马龙县明龙焦化实业有限公司 | A kind of coke-stove gas efficiently elutes benzene series system |
| WO2021097905A1 (en) * | 2019-11-19 | 2021-05-27 | 南京华电节能环保设备有限公司 | Recycling device for high-temperature sensible heat of raw coke oven gas in coke oven ascension pipe |
| CN211522136U (en) * | 2020-01-09 | 2020-09-18 | 曲靖市盛凯焦化有限责任公司 | High-efficient recovery unit of coke oven raw gas crude benzol |
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