CN219265087U - Wet and hot tail gas waste heat recovery system of leaching workshop - Google Patents
Wet and hot tail gas waste heat recovery system of leaching workshop Download PDFInfo
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- CN219265087U CN219265087U CN202320567659.XU CN202320567659U CN219265087U CN 219265087 U CN219265087 U CN 219265087U CN 202320567659 U CN202320567659 U CN 202320567659U CN 219265087 U CN219265087 U CN 219265087U
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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
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Abstract
The utility model discloses a leaching workshop wet and hot tail gas waste heat recovery system, which comprises: the scrubber sprays, washes and removes dust on the wet and hot tail gas of the dreg drying; the tube-in-tube heat exchanger exchanges heat between the washed tail gas and hot water in the tube side, and the tail gas after heat exchange enters the evaporator; the evaporator heats and evaporates the mixed oil on the tube side by the tail gas after heat exchange, and the cooled tail gas enters the steam-water separator; the centrifugal fan sucks the gas phase of the steam-water separator and empties; the flash tank is used for flashing hot water from the tube nest heat exchanger under negative pressure, and the cooled hot water is sent into a tube side top inlet of the tube nest heat exchanger for circulation by a hot water circulating pump and a hot water circulating tube; and the venturi heat pump sucks flash steam of the flash tank and maintains negative pressure in the flash tank. The system adopts negative pressure evaporation, so that heat in the tail gas of the wet and hot drying of the meal can be fully recovered, and the steam consumption of the evaporation system is obviously reduced.
Description
Technical Field
The utility model relates to an oil treatment system, in particular to a wet and hot tail gas waste heat recovery system of a leaching workshop, and belongs to the technical field of waste heat utilization.
Background
The oil industry adopts hexane to extract oil in oil, and wet meal after oil extraction contains 20-35% of solvent and needs to be removed by steam heating. The solvent is generally removed by direct steam at a pressure of less than 0.1MPa and indirect steam at a pressure of 0.7 to 1.0 MPa. The desolventizing process is to condense the steam after providing heat, the moisture is absorbed by the meal, the moisture is usually 16-19%, and the drying is required to be about 12.5% for convenient storage and transportation.
The existing general dreg drying and cooling system in the oil industry adopts a sieve plate structure with a plurality of layers of holes. The traditional drying and cooling system flow is as follows: fresh air introduced by the centrifugal fan enters the air heater to be heated, then enters the drying and cooling machine, passes through the material layer, brings out moisture, then enters the saxophone to be discharged, and dust enters the dreg scraper to be collected through the air seal. The hot meal containing water (the temperature is 100-105 ℃ and the moisture content is about 15-19%) enters a drying cooler through a material sealing auger, is subjected to multistage hot air drying, and finally enters a meal bin after being cooled by cold air through a material gate control after the last layer enters a meal scraper.
The traditional process has the following defects: 1. because the temperature is high when the hot meal enters the drying and cooling machine, and a large amount of steam is mixed, a large amount of steam leaks from the steam-stripping machine to the drying and cooling machine, and the workshop environment is seriously influenced;
2. the hot meal has high entering temperature, the temperature after the primary drying is 75-90 ℃, and the grade of hot water and hot air heat generated in the temperature interval is low and is difficult to use;
3. after the workshop condensate water passes through the condensate water flash tank, the temperature is still very high and reaches more than 95 ℃, and cavitation of a condensate water conveying pump is easily caused;
4. each layer is provided with a salon, and air is discharged after being used once; the tail gas discharged by the salon has high temperature and high humidity, and becomes a key position for heat recovery;
5. generally, a method of water heat collection or wind-wind heat exchange is adopted, the heat discharged by tail gas is still much, and the utilization rate is low.
Disclosure of Invention
The utility model aims to overcome the problems in the prior art and provide a wet and hot tail gas waste heat recovery system for a leaching workshop, which adopts negative pressure evaporation to fully recover heat in dry wet and hot tail gas of meal and obviously reduce steam consumption of an evaporation system.
In order to solve the technical problems, the utility model provides a leaching workshop wet and hot tail gas waste heat recovery system, which comprises: the scrubber sprays, washes and removes dust on the wet and hot tail gas of the dreg drying; the tube-in-tube heat exchanger exchanges heat between the washed tail gas and hot water in the tube side, and the tail gas after heat exchange enters the evaporator; the evaporator heats and evaporates the mixed oil on the tube side by the tail gas after heat exchange, and the cooled tail gas enters the steam-water separator; the centrifugal fan sucks the gas phase of the steam-water separator and empties; the flash tank is used for flashing hot water from the tube nest heat exchanger under negative pressure, and the cooled hot water is sent into a tube side top inlet of the tube nest heat exchanger for circulation by a hot water circulating pump and a hot water circulating tube; and the venturi heat pump sucks flash steam of the flash tank and maintains negative pressure in the flash tank.
As an improvement of the utility model, the main inlet of the Venturi heat pump is connected with the high-pressure steam pipe, the outlet of the Venturi heat pump is connected with the cold side inlet of the tube array heater, and the cold side outlet of the tube array heater is used as a heat source of the cooking pot, the oil modulation tower, the wet meal desolventizing and hot air heater.
As a further improvement of the utility model, the hot side inlet of the tube array heater is connected with the high pressure steam tube, and the condensed water outlet of the tube array heater is connected with the flash tank.
As a further improvement of the utility model, the inlet of the flash tank is also connected with a workshop steam condensate water pipe, the outlet of the hot water circulating pump is also connected with a workshop hot water pipe through an external supply regulating valve, and the opening degree of the external supply regulating valve is controlled by the liquid level of the flash tank.
As a further improvement of the utility model, a circulation regulating valve is arranged on the hot water circulation pipe at the outlet of the hot water circulation pump, and the opening of the circulation regulating valve is controlled by the flow rate of the hot water circulation pipe.
As a further improvement of the utility model, the bottom outlet of the steam-water separator is connected with a wastewater treatment station.
As a further improvement of the utility model, the bottom inlet of the tube side of the evaporator is connected with a mixed oil outlet tube, the top of the evaporator is provided with an evaporation chamber, the lower oil outlet of the evaporation chamber is connected with a mixed oil return tube, and the top exhaust port of the evaporation chamber is connected with a vacuum condenser.
Compared with the prior art, the utility model has the following beneficial effects: 1. the heat of the meal drying tail gas is directly converted into low-pressure steam, so that better utilization can be realized;
2. the heat recovery of the dreg drying tail gas and the heat recovery of condensed water are integrated, so that the hot water consumption of steam generation is automatically supplemented, and the device is intensified;
3. the mixed oil is heated by the tail gas at low temperature, so that the heat utilization of the tail gas is more sufficient;
4. the production line for producing oil from soybean at 5000 tons/day can reduce 15-20 kg of steam consumption per ton of soybean, reduce the heat of exhaust gas emission and save 2 ten thousand yuan of steam cost per day.
Drawings
The utility model will now be described in further detail with reference to the drawings and the detailed description, which are provided for reference and illustration only and are not intended to limit the utility model.
FIG. 1 is a flow chart of a wet and hot tail gas waste heat recovery system of a leaching plant;
in the figure: 1. a scrubber; 2. a washing circulation pump; 3. a tubular heat exchanger; 4. a flash tank; 5. a hot water circulation pump; 6. an external supply regulating valve; 7. a circulation regulating valve; 8. a venturi heat pump; 9. a tube array heater; 10. a power steam regulating valve; 11. an evaporator; 12. a steam-water separator; 13. a centrifugal fan; 14. a cooking pot; 15. an oil modulation tower; 16. desolventizing wet meal; 17. a hot air heater; 18. a wastewater treatment station; 19. a vacuum condenser; G1. a high pressure steam pipe; G2. a workshop steam condensation water pipe; G3. a workshop hot water pipe; G4. a mixed oil outlet pipe; G5. and a mixed oil return pipe.
Detailed Description
In the following description of the present utility model, the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing the present utility model and simplifying the description, and do not mean that the device must have a specific orientation.
The utility model is further described with reference to the following detailed drawings in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the implementation of the utility model easy to understand.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.
As shown in fig. 1, the wet and hot tail gas waste heat recovery system of the leaching workshop comprises a washer 1, a tubular heat exchanger 3, a flash tank 4, a Venturi heat pump 8, a tubular heater 9, an evaporator 11, a steam-water separator 12 and a centrifugal fan 13, wherein a discharge pipeline of the wet and hot tail gas of the dreg drying is connected with an air inlet of the washer 1, a water outlet at the bottom of the washer 1 is connected with an inlet of a washing circulating pump 2, an outlet of the washing circulating pump 2 is connected with a spraying port at the upper part of the washer 1 through a washing circulating pipe, and the wet and hot tail gas of the dreg drying enters the washer 1 and is washed by spraying water to remove small particles such as dust.
The top exhaust port of the scrubber 1 is connected with the lower shell side inlet of the tubular heat exchanger 3, the upper shell side outlet of the tubular heat exchanger 3 is connected with the shell side inlet of the evaporator 11, the shell side outlet of the evaporator 11 is connected with the middle inlet of the steam-water separator 12, and condensed water is discharged from the bottom outlet of the steam-water separator 12 and enters the wastewater treatment station 18 for treatment. The suction port of the centrifugal fan 13 is connected with the top outlet of the steam-water separator 12, and the outlet of the centrifugal fan 13 is emptied.
The bottom tube side inlet of the evaporator 11 is connected with a mixed oil outlet pipe G4 from the leaching unit, the top of the evaporator 11 is provided with an evaporation chamber, the lower oil outlet of the evaporation chamber is connected with a mixed oil return pipe G5, and the top exhaust port of the evaporation chamber is connected with a vacuum condenser 19.
The heat source of the system is mainly divided into two parts, one part is meal drying wet and hot tail gas, the temperature is generally 85-95 ℃, the moisture content is generally 35-90%, the heat source contains trace dust, the dust enters the shell side of the tubular heat exchanger 3 after being washed by the washer 1, the heat source exchanges heat with hot water conveyed by the hot water circulating pump 5 in the tube side, and the hot water and steam are separated in the flash tank 4 in a gas-liquid mode under the negative pressure state. The temperature of the tail gas passing through the tube nest heat exchanger 3 is higher, the temperature is about 75-85 ℃, the tail gas enters the evaporator 11 and is used for heating the mixed oil flowing through the tube side of the evaporator 11, and the cooled tail gas enters the steam-water separator 12 to be subjected to gas-liquid separation. The evaporated solvent vapor enters a vacuum condenser 19 to be condensed and recovered. Because the boiling point of all the leached solvents is 68 ℃, under the negative pressure state, the heat in the tail gas can be fully utilized, and the temperature of the discharged tail gas is lower than 50 ℃.
The lower end of the tube side of the tube nest heat exchanger 3 is connected with the flash tank 4 through a communicating tube, the bottom outlet of the lower end enclosure of the tube nest heat exchanger 3 and the bottom outlet of the flash tank 4 are connected with the inlet of the hot water circulating pump 5 together, and the outlet of the hot water circulating pump 5 is connected with the upper end tube side inlet of the tube nest heat exchanger 3 through a hot water circulating tube. The hot water from the tube nest heat exchanger 3 is flashed under negative pressure, and the cooled hot water is sent into the top inlet of the tube side of the tube nest heat exchanger 3 for circulation by the hot water circulating pump 5 and the hot water circulating tube.
The hot water circulation pipe at the outlet of the hot water circulation pump 5 is provided with a circulation regulating valve 7, and the opening of the circulation regulating valve 7 is controlled by the flow of the hot water circulation pipe. The water quantity of the tube nest heat exchanger 3 is controlled by the circulation regulating valve 7 through feedback of the flowmeter.
The other part of heat source is condensed water of the workshop, which is condensed water discharged by workshop steam heating equipment, the temperature is usually 95-105 ℃, the inlet of the flash tank 4 is also connected with a workshop steam condensate water pipe G2, the condensed water is directly fed into the flash tank 4 for flash evaporation under negative pressure, low-pressure steam is generated, the condensed water becomes hot water with the temperature of 80-85 ℃, and the hot water is fed into the top of the tube side heat exchanger 3 through a hot water circulating pump 5.
The outlet of the hot water circulating pump 5 is also connected with a workshop hot water pipe G3 through an external supply regulating valve 6, and the opening degree of the external supply regulating valve 6 is controlled by the liquid level of the flash tank 4. And the liquid level is automatically regulated according to the signal fed back to the external supply regulating valve 6 by the liquid level sensor LT of the flash tank 4, so that the liquid level stability of the flash tank is ensured.
The main inlet of the venturi heat pump 8 is connected with the high-pressure steam pipe G1, the suction port of the venturi heat pump 8 is connected with the flash steam outlet at the top of the flash tank 4, and the venturi heat pump 8 sucks flash steam of the flash tank 4 to maintain negative pressure in the flash tank 4. The high-pressure steam entering the main inlet of the venturi heat pump 8 passes through the power steam regulating valve 10, the power steam regulating valve 10 is used for regulating the opening according to the pressure set by the pressure sensor PT, the pressure at the outlet of the flash tank 4 is set according to the running state, and the flash tank 4 is generally set to work within the range of 20-50 kPa (A) of absolute pressure.
The outlet of the Venturi heat pump 8 is connected with the cold side inlet of the tube array heater 9, the pressure of steam discharged by the Venturi heat pump 8 is 0.01-0.1 MPa, and the steam enters the tube array heater 9 for heating, so that the dryness and the superheat degree of the steam are improved, and the steam is used as a heat source of the cooking pot 14, the oil modulation tower 15, the wet meal desolventizing 16 and the hot air heater 17.
The hot side inlet of the tube array heater 9 is connected with a high-pressure steam tube G1, and condensed water discharged from the shell side of the tube array heater 9 enters the flash tank 4 for collection.
The foregoing description of the preferred embodiments of the present utility model illustrates and describes the basic principles and main features of the present utility model and the advantages of the present utility model, and is not meant to limit the scope of the present utility model, as it should be understood by those skilled in the art that the present utility model is not limited to the above-described embodiments. In addition to the embodiments described above, other embodiments of the utility model are possible without departing from the spirit and scope of the utility model. The utility model also has various changes and improvements, and all technical schemes formed by adopting equivalent substitution or equivalent transformation fall within the protection scope of the utility model. The scope of the utility model is defined by the appended claims and equivalents thereof. The technical features of the present utility model that are not described may be implemented by or using the prior art, and are not described herein.
Claims (7)
1. The utility model provides a wet hot tail gas waste heat recovery system of leaching workshop which characterized in that includes:
the scrubber sprays, washes and removes dust on the wet and hot tail gas of the dreg drying;
the tube-in-tube heat exchanger exchanges heat between the washed tail gas and hot water in the tube side, and the tail gas after heat exchange enters the evaporator;
the evaporator heats and evaporates the mixed oil on the tube side by the tail gas after heat exchange, and the cooled tail gas enters the steam-water separator;
the centrifugal fan sucks the gas phase of the steam-water separator and empties;
the flash tank is used for flashing hot water from the tube nest heat exchanger under negative pressure, and the cooled hot water is sent into a tube side top inlet of the tube nest heat exchanger for circulation by a hot water circulating pump and a hot water circulating tube;
and the venturi heat pump sucks flash steam of the flash tank and maintains negative pressure in the flash tank.
2. The leaching plant wet and hot tail gas waste heat recovery system according to claim 1, wherein: the main inlet of the Venturi heat pump is connected with the high-pressure steam pipe, the outlet of the Venturi heat pump is connected with the cold side inlet of the tube array heater, and the cold side outlet of the tube array heater is used as a heat source of the cooking pot, the oil modulation tower, the wet meal desolventizing and hot air heater.
3. The leaching plant wet and hot tail gas waste heat recovery system according to claim 2, wherein: the hot side inlet of the tube array heater is connected with the high-pressure steam tube, and the condensed water outlet of the tube array heater is connected into the flash tank.
4. The leaching plant wet and hot tail gas waste heat recovery system according to claim 1, wherein: the inlet of the flash tank is also connected with a workshop steam condensate water pipe, the outlet of the hot water circulating pump is also connected with a workshop hot water pipe through an external supply regulating valve, and the opening of the external supply regulating valve is controlled by the liquid level of the flash tank.
5. The leaching plant wet and hot tail gas waste heat recovery system according to claim 1, wherein: the hot water circulating pipe at the outlet of the hot water circulating pump is provided with a circulating regulating valve, and the opening of the circulating regulating valve is controlled by the flow of the hot water circulating pipe.
6. The leaching plant wet and hot tail gas waste heat recovery system according to claim 1, wherein: and the bottom outlet of the steam-water separator is connected with a wastewater treatment station.
7. The leaching plant wet and hot tail gas waste heat recovery system according to claim 1, wherein:
the bottom inlet of the tube side of the evaporator is connected with a mixed oil outlet tube, the top of the evaporator is provided with an evaporation chamber, the lower oil outlet of the evaporation chamber is connected with a mixed oil return tube, and the top exhaust port of the evaporation chamber is connected with a vacuum condenser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320567659.XU CN219265087U (en) | 2023-03-21 | 2023-03-21 | Wet and hot tail gas waste heat recovery system of leaching workshop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320567659.XU CN219265087U (en) | 2023-03-21 | 2023-03-21 | Wet and hot tail gas waste heat recovery system of leaching workshop |
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| CN219265087U true CN219265087U (en) | 2023-06-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202320567659.XU Active CN219265087U (en) | 2023-03-21 | 2023-03-21 | Wet and hot tail gas waste heat recovery system of leaching workshop |
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| CN (1) | CN219265087U (en) |
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- 2023-03-21 CN CN202320567659.XU patent/CN219265087U/en active Active
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