CN108854456B - System and method for recycling heat energy of desorption tower - Google Patents

System and method for recycling heat energy of desorption tower Download PDF

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Publication number
CN108854456B
CN108854456B CN201810781090.0A CN201810781090A CN108854456B CN 108854456 B CN108854456 B CN 108854456B CN 201810781090 A CN201810781090 A CN 201810781090A CN 108854456 B CN108854456 B CN 108854456B
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pipeline
tower
condensate
heat exchanger
communicated
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CN108854456A (en
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孙立斌
李光熙
王野
王丹
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Jiusan Group Changchun Soybean Technology Co ltd
Jiusan Oil & Fat Co ltd
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Jiusan Group Changchun Soybean Technology Co ltd
Jiusan Oil & Fat Co ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1425Regeneration of liquid absorbents
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D1/00Evaporating
    • B01D1/0082Regulation; Control
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D1/00Evaporating
    • B01D1/26Multiple-effect evaporating
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D1/00Evaporating
    • B01D1/30Accessories for evaporators ; Constructional details thereof
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D3/00Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/34Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping with one or more auxiliary substances
    • B01D3/38Steam distillation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D3/00Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/42Regulation; Control
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/02Treatment of water, waste water, or sewage by heating
    • C02F1/04Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/048Purification of waste water by evaporation
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Abstract

The invention belongs to the technical field of heat energy recycling, and particularly relates to a system and a method for recycling heat energy of an analytic tower. The system comprises a resolving tower, a heat exchanger, an integrated water distribution box and a cooking tank, wherein an outlet at the top of the resolving tower is communicated with an inlet at the upper part of a shell layer of the heat exchanger through a first pipeline, an inlet at the top of the tube layer of the heat exchanger is communicated with a condensate collecting pipe through a second pipeline, an outlet at the lower part of the shell layer of the heat exchanger is communicated with the integrated water distribution box through a third pipeline, and an outlet at the bottom of the tube layer of the heat exchanger is communicated with the integrated water distribution box through a fourth pipeline; the comprehensive water distribution box is communicated with the cooking pot through a waste water pipeline. The invention fully utilizes the heat of the vacuum condensed gas-liquid mixture generated by the desorption tower to exchange heat with the condensate generated by the first evaporator, the second evaporator, the stripping tower and the vacuum dryer, so that the temperature of the solvent mixed liquid in the water distribution box is increased by 5-6 ℃, the temperature of the solvent and the waste water after water distribution is increased, and the use amount of heat, direct steam and circulating water is saved.

Description

System and method for recycling heat energy of desorption tower
Technical Field
The invention belongs to the technical field of heat energy recycling, and particularly relates to a system and a method for recycling heat energy of an analytic tower.
Background
In the existing oil leaching process, a free gas system of the whole leaching workshop works in a micro-negative pressure state, so that unsafe influence caused by leakage of a solvent used for oil leaching can be effectively prevented, and the consumption of the solvent is reduced. And recovering the saturated solvent in the tail gas by using the tail gas free gas through an absorption tower, an analysis tower and a high-throwing low-absorption principle. Mineral oil is sprayed from the top of the absorption tower, tail gas enters from the bottom of the absorption tower, the tail gas and the mineral oil are in high-efficiency countercurrent contact on the surface of a packing in the absorption tower, mass and heat transfer exchange is effectively carried out, and a saturated solvent in the tail gas is absorbed and dissolved in the mineral oil to form 'rich oil'. The 'rich oil' is sprayed from the top of the desorption tower, direct steam is sprayed from the bottom of the desorption tower to be in countercurrent contact with the 'rich oil' falling from the top on the surface of the filler, the solvent dissolved in the 'rich oil' is stripped out to form a high-temperature vacuum condensation gas-liquid mixture, and the high-temperature vacuum condensation gas-liquid mixture enters a normal-pressure condenser to be condensed, divided and recycled, so that the waste of high-temperature energy of the vacuum condensation gas-liquid mixture is caused by the process.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a system and a method for recycling the heat energy of an analytical tower.
The technical scheme of the invention is as follows:
a heat energy recycling system of an analytic tower comprises the analytic tower, a heat exchanger, a comprehensive water distribution box and a cooking pot, wherein an outlet at the top of the analytic tower is communicated with an inlet at the upper part of a shell layer of the heat exchanger through a first pipeline, an inlet at the top of the tube layer of the heat exchanger is communicated with a condensate collecting pipe through a second pipeline, an outlet at the lower part of the shell layer of the heat exchanger is communicated with a comprehensive water distribution box through a third pipeline, and an outlet at the bottom of the tube layer of the heat exchanger is communicated with the comprehensive water distribution box through a fourth pipeline; the comprehensive water distribution box is communicated with the cooking pot through a waste water pipeline.
Furthermore, a feed inlet at the upper part of the desorption tower is communicated with a discharge outlet at the top end of the paraffin rich oil heater through a paraffin rich oil pipeline, and a paraffin rich oil feed pipeline is arranged at the bottom of the paraffin rich oil heater.
Further, a steam inlet at the lower part of the desorption tower is communicated with a steam pipeline.
Further, an outlet at the bottom of the desorption tower is communicated with a paraffin lean oil pipeline.
Furthermore, the condensate collecting pipe is respectively communicated with the first evaporator condensate pipe, the second evaporator condensate pipe, the stripper condensate pipe and the vacuum dryer condensate pipe.
A method for recycling heat energy of an analytic tower comprises the following steps: paraffin rich oil dissolved with a solvent for oil immersion and generated by an absorption tower enters a paraffin rich oil heater through a paraffin rich oil feeding pipeline to be heated, the paraffin rich oil heated to a certain temperature is sprayed into an analytical tower from the top of the analytical tower through a feeding hole at the upper part of the analytical tower through a paraffin rich oil pipeline, direct steam in a steam pipeline is sprayed into the analytical tower from the bottom of the analytical tower through a steam inlet at the lower part of the analytical tower and is in countercurrent contact with the paraffin rich oil falling from the top of the analytical tower on the surface of a packing in the analytical tower, the solvent in the paraffin rich oil is stripped out by the direct steam, and a generated vacuum condensed gas-liquid mixture enters an inlet at the upper part of a shell of a heat exchanger through a first pipeline through an outlet at the top of; meanwhile, vacuum condensate generated by the first evaporator, the second evaporator, the stripping tower and the vacuum dryer is collected in a condensate collecting pipe through a first evaporator condensate pipe, a second evaporator condensate pipe, a stripping tower condensate pipe and a vacuum dryer condensate pipe respectively, and enters an inlet at the top of a heat exchanger pipe layer through a second pipeline, a vacuum condensate gas-liquid mixture is used as a heat source to exchange heat with the vacuum condensate in the heat exchanger to form condensate, the condensate enters the comprehensive water dividing tank through a third pipeline from an outlet at the lower part of a shell layer of the heat exchanger, and the vacuum condensate heated after heat exchange enters the comprehensive water dividing tank through a fourth pipeline from an outlet at the bottom of the heat exchanger pipe layer; the vacuum condensate is separated from the solvent and water in the comprehensive water separating box, and the formed waste water enters the cooking for cooking and extracting the residual solvent in the waste water through a waste water pipeline.
Further, the temperature of the paraffin-rich oil after heating is 105-110 ℃.
Further, the temperature of the vacuum condensation gas-liquid mixture is 200 ℃.
The invention has the beneficial effects that:
1. the invention fully utilizes the heat of the high-temperature vacuum condensed gas-liquid mixture generated by the desorption tower to exchange heat with the low-temperature condensate generated by the first evaporator, the second evaporator, the stripping tower and the vacuum dryer, improves the temperature of the low-temperature condensate when entering the water diversion box, increases the temperature of the solvent mixed liquid in the water diversion box by 5-6 ℃, not only saves heat energy, but also improves the temperature of the solvent and the waste water after water diversion, and saves the usage amount of direct steam consumed by the waste water in the cooking pot.
2. According to the invention, the high-temperature vacuum condensed gas-liquid mixture generated by the desorption tower is input into the heat exchanger for heat exchange without passing through the normal-pressure condenser, so that the workload of the normal-pressure condenser is reduced, and the circulation volume of circulating water is saved and reaches 200-300 t/h.
Drawings
FIG. 1 is a system schematic diagram of a heat energy recovery system of a desorption tower according to the present invention;
in the figure: 1. a resolution tower; 2. a heat exchanger; 3. a comprehensive water distribution box; 4. a cooking pot; 5. a first pipeline; 6. a second pipeline; 7. a condensate header; 8. a third pipeline; 9. a fourth pipeline; 10. a waste water line; 11. a first evaporator condensate line; 12. a second evaporator condensate line; 13. a stripper condensate line; 14. a vacuum dryer condensate pipe; 15. a paraffin rich oil pipeline; 16. a paraffin rich oil heater; 17. a paraffin rich oil feed line; 18. a steam line; 19. a paraffin lean oil pipeline.
Detailed Description
The technical solutions of the present invention are further described below with reference to the following examples, but the present invention is not limited thereto, and any modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Example 1
A heat energy recycling system of an analytic tower comprises the analytic tower 1, a heat exchanger 2, a comprehensive water dividing tank 3 and a cooking tank 4, wherein an outlet at the top of the analytic tower 1 is communicated with an inlet at the upper part of a shell layer of the heat exchanger 2 through a first pipeline 5, an inlet at the top of the tube layer of the heat exchanger 2 is communicated with a condensate collecting pipe 7 through a second pipeline 6, an outlet at the lower part of the shell layer of the heat exchanger 2 is communicated with the comprehensive water dividing tank 3 through a third pipeline 8, and an outlet at the bottom of the tube layer of the heat exchanger 2 is communicated with the comprehensive water dividing tank 3 through a fourth pipeline 9; the comprehensive water distribution box 3 is communicated with the cooking pot 4 through a waste water pipeline 10.
Example 2
A heat energy recycling system of an analytic tower comprises the analytic tower 1, a heat exchanger 2, a comprehensive water dividing tank 3 and a cooking tank 4, wherein an outlet at the top of the analytic tower 1 is communicated with an inlet at the upper part of a shell layer of the heat exchanger 2 through a first pipeline 5, an inlet at the top of the tube layer of the heat exchanger 2 is communicated with a condensate collecting pipe 7 through a second pipeline 6, an outlet at the lower part of the shell layer of the heat exchanger 2 is communicated with the comprehensive water dividing tank 3 through a third pipeline 8, and an outlet at the bottom of the tube layer of the heat exchanger 2 is communicated with the comprehensive water dividing tank 3 through a fourth pipeline 9; the comprehensive water distribution box 3 is communicated with the cooking pot 4 through a waste water pipeline 10.
A feeding hole in the upper part of the desorption tower 1 is communicated with a discharging hole in the top end of the paraffin rich oil heater 16 through a paraffin rich oil pipeline 15, and a paraffin rich oil feeding pipeline 17 is arranged at the bottom of the paraffin rich oil heater 16.
Example 3
A heat energy recycling system of an analytic tower comprises the analytic tower 1, a heat exchanger 2, a comprehensive water dividing tank 3 and a cooking tank 4, wherein an outlet at the top of the analytic tower 1 is communicated with an inlet at the upper part of a shell layer of the heat exchanger 2 through a first pipeline 5, an inlet at the top of the tube layer of the heat exchanger 2 is communicated with a condensate collecting pipe 7 through a second pipeline 6, an outlet at the lower part of the shell layer of the heat exchanger 2 is communicated with the comprehensive water dividing tank 3 through a third pipeline 8, and an outlet at the bottom of the tube layer of the heat exchanger 2 is communicated with the comprehensive water dividing tank 3 through a fourth pipeline 9; the comprehensive water distribution box 3 is communicated with the cooking pot 4 through a waste water pipeline 10.
A feeding hole in the upper part of the desorption tower 1 is communicated with a discharging hole in the top end of the paraffin rich oil heater 16 through a paraffin rich oil pipeline 15, and a paraffin rich oil feeding pipeline 17 is arranged at the bottom of the paraffin rich oil heater 16.
And an outlet at the bottom of the desorption tower 1 is communicated with a paraffin lean oil pipeline 19.
Example 4
A heat energy recycling system of an analytic tower comprises the analytic tower 1, a heat exchanger 2, a comprehensive water dividing tank 3 and a cooking tank 4, wherein an outlet at the top of the analytic tower 1 is communicated with an inlet at the upper part of a shell layer of the heat exchanger 2 through a first pipeline 5, an inlet at the top of the tube layer of the heat exchanger 2 is communicated with a condensate collecting pipe 7 through a second pipeline 6, an outlet at the lower part of the shell layer of the heat exchanger 2 is communicated with the comprehensive water dividing tank 3 through a third pipeline 8, and an outlet at the bottom of the tube layer of the heat exchanger 2 is communicated with the comprehensive water dividing tank 3 through a fourth pipeline 9; the comprehensive water distribution box 3 is communicated with the cooking pot 4 through a waste water pipeline 10.
A feeding hole in the upper part of the desorption tower 1 is communicated with a discharging hole in the top end of the paraffin rich oil heater 16 through a paraffin rich oil pipeline 15, and a paraffin rich oil feeding pipeline 17 is arranged at the bottom of the paraffin rich oil heater 16.
And an outlet at the bottom of the desorption tower 1 is communicated with a paraffin lean oil pipeline 19.
The condensate collecting pipe 7 is respectively communicated with a first evaporator condensate pipe 11, a second evaporator condensate pipe 12, a stripper condensate pipe 13 and a vacuum dryer condensate pipe 14.
Example 5
A method for recycling heat energy of an analytical tower comprises the steps that paraffin rich oil which is generated by an absorption tower and dissolved with a solvent used for oil immersion enters a paraffin rich oil heater 16 through a paraffin rich oil feeding pipeline 17 to be heated, the paraffin rich oil which is heated to a certain temperature is sprayed into the analytical tower from the top of the analytical tower 1 through a feeding hole at the upper part of the analytical tower 1 through a paraffin rich oil pipeline 15, direct steam in a steam pipeline 18 is sprayed into the analytical tower from the bottom of the analytical tower 1 through a steam inlet at the lower part of the analytical tower 1 and is in countercurrent contact with the paraffin rich oil falling from the top of the analytical tower on the surface of a filler in the analytical tower, the solvent in the paraffin rich oil is stripped through the direct steam, and a generated vacuum condensed gas-liquid mixture enters an inlet at the upper part of a shell layer 2 of a heat exchanger through a first pipeline; meanwhile, vacuum condensate generated by the first evaporator, the second evaporator, the stripping tower and the vacuum dryer is collected in a condensate collecting pipe 7 through a first evaporator condensate pipe 11, a second evaporator condensate pipe 12, a stripping tower condensate pipe 13 and a vacuum dryer condensate pipe 14 respectively, and enters an inlet at the top of a pipe layer of the heat exchanger 2 through a second pipeline 6, a vacuum condensate gas-liquid mixture is used as a heat source to exchange heat with the vacuum condensate in the heat exchanger 2 to form condensate, the condensate enters the comprehensive water dividing tank 3 through a third pipeline 8 from an outlet at the lower part of a shell layer of the heat exchanger 2, and the vacuum condensate heated after heat exchange enters the comprehensive water dividing tank 3 through a fourth pipeline 9 from an outlet at the bottom of the pipe layer of the heat exchanger 2; the vacuum condensate is separated from the solvent and water in the comprehensive water separating box 3, and the formed waste water enters the cooking pot 4 through the waste water pipeline 10 to be cooked and extracted to obtain the residual solvent in the waste water.
Example 6
A method for recycling heat energy of an analytical tower comprises the steps that paraffin rich oil which is generated by an absorption tower and dissolved with a solvent used for oil immersion enters a paraffin rich oil heater 16 through a paraffin rich oil feeding pipeline 17 to be heated, the paraffin rich oil which is heated to 105-110 ℃ is sprayed into the analytical tower from the top of the analytical tower 1 through a feeding hole in the upper part of the analytical tower 1 through a paraffin rich oil pipeline 15, direct steam in a steam pipeline 18 is sprayed into the analytical tower from the bottom of the analytical tower 1 through a steam inlet in the lower part of the analytical tower 1 and is in countercurrent contact with the paraffin rich oil falling from the top of the analytical tower on the surface of a filler in the analytical tower, the solvent in the paraffin rich oil is stripped through the direct steam, and a generated vacuum condensed gas-liquid mixture at 200 ℃ enters an inlet in the upper part of a shell of a heat exchanger 2 through a first pipeline 5 through; meanwhile, vacuum condensate generated by the first evaporator, the second evaporator, the stripping tower and the vacuum dryer is collected in a condensate collecting pipe 7 through a first evaporator condensate pipe 11, a second evaporator condensate pipe 12, a stripping tower condensate pipe 13 and a vacuum dryer condensate pipe 14 respectively, and enters an inlet at the top of a pipe layer of the heat exchanger 2 through a second pipeline 6, a vacuum condensate gas-liquid mixture is used as a heat source to exchange heat with the vacuum condensate in the heat exchanger 2 to form condensate, the condensate enters the comprehensive water dividing tank 3 through a third pipeline 8 from an outlet at the lower part of a shell layer of the heat exchanger 2, and the vacuum condensate heated after heat exchange enters the comprehensive water dividing tank 3 through a fourth pipeline 9 from an outlet at the bottom of the pipe layer of the heat exchanger 2; the vacuum condensate is separated from the solvent and water in the comprehensive water separating box 3, and the formed waste water enters the cooking pot 4 through the waste water pipeline 10 to be cooked and extracted to obtain the residual solvent in the waste water.

Claims (4)

1. A heat energy recycling system of an analytic tower comprises the analytic tower (1), a heat exchanger (2), a comprehensive water dividing tank (3) and a cooking pot (4), it is characterized in that the top outlet of the desorption tower (1) is communicated with the inlet at the upper part of the shell layer of the heat exchanger (2) through a first pipeline (5), the top inlet of the tube layer of the heat exchanger (2) is communicated with a condensate collecting tube (7) through a second pipeline (6), the condensate collecting pipe (7) is respectively communicated with a first evaporator condensate pipe (11), a second evaporator condensate pipe (12), a stripping tower condensate pipe (13) and a vacuum dryer condensate pipe (14), the lower outlet of the shell layer of the heat exchanger (2) is communicated with the comprehensive water distribution box (3) through a third pipeline (8), an outlet at the bottom of the tube layer of the heat exchanger (2) is communicated with the comprehensive water dividing tank (3) through a fourth pipeline (9); the comprehensive water distribution box (3) is communicated with the cooking pot (4) through a waste water pipeline (10); a feed inlet at the upper part of the desorption tower (1) is communicated with a discharge outlet at the top end of a paraffin rich oil heater (16) through a paraffin rich oil pipeline (15), and a paraffin rich oil feed pipeline (17) is arranged at the bottom of the paraffin rich oil heater (16); and a steam inlet at the lower part of the desorption tower (1) is communicated with a steam pipeline (18).
2. The heat energy recycling system of the desorption tower as claimed in claim 1, characterized in that the outlet at the bottom of the desorption tower (1) is communicated with a paraffin lean oil pipeline (19).
3. A method for recycling heat energy of an analytical tower is characterized in that paraffin rich oil dissolved with a solvent used for oil immersion and generated by an absorption tower enters a paraffin rich oil heater (16) through a paraffin rich oil feeding pipeline (17) to be heated, the paraffin rich oil heated to a certain temperature is sprayed into the analytical tower from the top of the analytical tower (1) through a feeding hole at the upper part of the analytical tower (1) through a paraffin rich oil pipeline (15), direct steam in a steam pipeline (18) is sprayed into the analytical tower from the bottom of the analytical tower (1) through a steam inlet at the lower part of the analytical tower (1) and is in countercurrent contact with the paraffin rich oil falling from the top of the analytical tower on the surface of a packing in the analytical tower, the solvent in the paraffin rich oil is stripped through the direct steam, a generated vacuum condensation gas-liquid mixture enters an inlet at the upper part of a shell layer of a heat exchanger (2) through a first pipeline (5) through an outlet at the top of the analytical tower, the temperature of the vacuum condensation gas-liquid mixture is 200 ℃; meanwhile, vacuum condensate generated by the first evaporator, the second evaporator, the stripping tower and the vacuum dryer is collected in a condensate collecting pipe (7) through a first evaporator condensate pipe (11), a second evaporator condensate pipe (12), a stripping tower condensate pipe (13) and a vacuum dryer condensate pipe (14) respectively and enters an inlet at the top of a pipe layer of the heat exchanger (2) through a second pipeline (6), the vacuum condensate gas-liquid mixture is used as a heat source to exchange heat with the vacuum condensate in the heat exchanger (2) to form condensate, the condensate enters the comprehensive water distribution box (3) through a third pipeline (8) from an outlet at the lower part of a shell layer of the heat exchanger (2), and the heated vacuum condensate enters the comprehensive water distribution box (3) through a fourth pipeline (9) from an outlet at the bottom of the pipe layer of the heat exchanger (2); raising the temperature of the solvent mixed liquid in the water distribution box by 5-6 ℃; the vacuum condensate is separated from the solvent and water in the comprehensive water distribution box (3), and the formed wastewater enters the cooking pot (4) through the wastewater pipeline (10) to be cooked and extracted to obtain the residual solvent in the wastewater.
4. The method for recycling heat energy of the desorption tower as claimed in claim 3, wherein the temperature of the paraffin-rich oil after being heated is 105-110 ℃.
CN201810781090.0A 2018-07-17 2018-07-17 System and method for recycling heat energy of desorption tower Active CN108854456B (en)

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