CN218653048U - Heat pump rectifying device - Google Patents
Heat pump rectifying device Download PDFInfo
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- CN218653048U CN218653048U CN202223398071.0U CN202223398071U CN218653048U CN 218653048 U CN218653048 U CN 218653048U CN 202223398071 U CN202223398071 U CN 202223398071U CN 218653048 U CN218653048 U CN 218653048U
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Abstract
The application provides a heat pump rectifying device, which comprises a rectifying tower, wherein the top of the rectifying tower is connected with a compressor through a first pipeline, the compressor is connected with a first reboiler, the bottom of the first reboiler is connected with the rectifying tower, the first reboiler is connected with a second preheater through a lateral line, the second preheater is connected with the rectifying tower, the bottom of the rectifying tower is connected with a third preheater, the third preheater is connected with the rectifying tower through a fourth pipeline, the second preheater is also connected with a gas-liquid separation tank, the gas-liquid separation tank is connected with the first preheater, the first preheater is respectively connected with the second preheater and the third preheater, and the lower part of the rectifying tower is also connected with the second reboiler; the tower top gas is used as the heat source of the first reboiler and the second preheater, the liquid after the heat supply of the second preheater is used as the heat source of the first preheater, and the material at the bottom of the rectifying tower is used as the heat source of the third preheater, so that the latent heat of condensation of the gas and the liquid is fully utilized, and meanwhile, the consumption of the tower kettle heat public engineering and the tower top cold public engineering is reduced.
Description
Technical Field
The application relates to the technical field of chemical equipment, in particular to a heat pump rectifying device.
Background
Rectification is an important component in the industries such as chemical industry, petrochemical industry and the like, and the energy consumption of petroleum and chemical industry accounts for a great proportion of the total industrial energy consumption, wherein about 60 percent of the energy consumption is used in the rectification process; in the flow of the conventional rectifying tower, about 95 percent of energy input by a reboiler at the bottom of the tower is taken away by cooling air or cooling water at the top of the tower, generally, the energy cannot be further recycled, and the thermodynamic efficiency is low, so that the energy saving of the rectifying process is very necessary, and for many years, people adopt various methods and means to improve the device and the operation of the rectifying tower so as to reduce the energy consumed by the rectifying tower, such as modes of preheating feeding by product streams, increasing the number of tower plates, reducing the reflux ratio, additionally arranging an intermediate reboiler, an intermediate condenser, proper heat insulation materials, efficient fillers and the like; however, to further reduce the energy consumption, the heat pump technology is the most prominent and effective energy-saving method at present only by recovering the heat at the top of the tower.
The heat pump rectification is to pressurize and heat the steam at the top of the rectification tower to ensure that the steam is used as a heat source of a reboiler at the bottom of the tower and to recover the latent heat of condensation of the steam at the top of the tower, so the heat pump rectification is a good energy-saving technology; in the prior art, heat pump rectification is applied to many occasions, and the applicant searches the prior art as follows:
prior art 1: the application number is CN201010117891.0, in the application, crude methanol raw material is preheated and then enters a pre-tower for preliminary rectification, light component impurities are discharged from the top of the pre-tower, crude methanol without light components enters an atmospheric tower A section for rectification, the rectified methanol gas at the top of the tower is pressurized and heated by a compressor, the rectified methanol gas after compression is used as a reboiling heat source of a tower kettle, the rectified methanol discharged by a reboiler is sequentially cooled by a crude methanol preheater and a rectified methanol water cooler, the rectified methanol after cooling is divided into two parts, one part is a rectified methanol product, the other part is reflux liquid at the atmospheric tower A section, liquid discharged from the tower at the atmospheric tower A section enters the top of the atmospheric tower B section for rectification, gas discharged from the tower top at the atmospheric tower B section enters the bottom of the atmospheric tower A section, fusel is extracted from a side line at the atmospheric tower B section, and wastewater is discharged from the tower kettle; the invention adopts a split heat pump rectification process, takes the compressed refined methanol gas as the heat source of the reboiler of the A section of the tower kettle of the atmospheric tower, reduces the comprehensive energy consumption by about 52 percent compared with the prior three-tower rectification technology, and has obvious economic benefit.
Prior art 2: a heat pump rectification system with application number CN201620188944.0 belongs to the field of heat pump rectification, and comprises a rectification tower, a steam compressor, a reboiler and a preheater; the operating pressure of the rectifying tower in the recovery of the ethanol solution is 50kPa to 300kPa, and the reflux ratio is 0.5 to 4; vapor compressor, compress and press and to compress ratio for 1.5-8, the utility model discloses can reduce the energy consumption in the traditional production process.
Among the above-mentioned two prior art, the smart methyl alcohol gas in top of the tower rises the temperature through the compressor pressure boost, and the smart methyl alcohol gas after the compression is as the reboiling heat source of tower cauldron, can practice thrift the energy consumption, and gas after compressor pressure boost intensification compression in prior art 2 not only can be as the reboiling heat source of tower cauldron, also can supply heat to the pre-heater, the heat at make full use of top of the tower, nevertheless has following shortcoming among the above-mentioned prior art:
1. the preheating is single-stage preheating;
2. the heat of the liquid at the bottom of the rectifying tower and the heat of the liquid cooled at the top of the rectifying tower are not utilized;
in summary, a new technical solution is needed to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
The application provides a heat pump rectifying device, including the rectifying column, pipeline one is passed through at the top of rectifying column and is connected with the compressor, the compressor passes through pipeline two and is connected with reboiler one, and the bottom of reboiler one is connected with the rectifying column, and reboiler one is connected with preheater two through the lateral line, and preheater two is connected with the rectifying column through pipeline three, the top and the gas-liquid separation jar of preheater two are connected, the gas-liquid separation jar still is connected with rectifying column and preheater one respectively, preheater one is connected with preheater two, preheater three respectively, preheater three with respectively with the rectifying column in the upper portion and the tower cauldron be connected, the lower part of rectifying column still is connected with reboiler two.
As a preferable scheme, the top of the gas-liquid separation tank is connected with a second condenser.
Preferably, the gas-liquid separation tank is connected with a compressor.
Preferably, a buffer tank is arranged between the first reboiler and the second preheater.
As a preferable scheme, a material pipeline between a tower kettle and a third preheater of the rectifying tower is provided with a ten-way pipeline, the ten-way pipeline is connected with the top of the first reboiler, and the ten-way pipeline is provided with a valve.
Preferably, the reboiler comprises two falling film reboilers arranged in parallel or two low-temperature high-efficiency reboilers arranged in parallel.
Preferably, the parallel falling film reboilers or the parallel low-temperature high-efficiency reboilers are used at the same time, and bear 50% of load respectively.
Preferably, the second reboiler adopts a thermosiphon reboiler.
Preferably, the compressor comprises a first compressor and a second compressor which are arranged in parallel.
Preferably, the first compressor and the second compressor which are arranged in parallel are used simultaneously and bear 50% of load respectively.
As a preferred scheme, the top of the rectifying tower is connected with a gas-liquid separation tank through a pipeline, and a condenser is arranged on the pipeline.
This application adopts tertiary preheating, changes traditional rectification mode, compresses the top of the tower gas through the compressor, improves the pressure and the condensation temperature of top of the tower gas, as reboiler one and second heat source of pre-heater, the liquid after the heat supply to pre-heater two is as the heat source of pre-heater one, and the material at the bottom of the rectifying column is as the heat source of pre-heater three, make full use of the condensation latent heat of gas, liquid, reduced the consumption of hot public works of tower cauldron and the cold public works at the top of the tower simultaneously.
By adopting the scheme, compared with the prior rectification process, the energy consumed by the compressor is 20-40% of the energy directly consumed by the reboiler, so that the energy consumption is greatly reduced; the application improves the traditional process, and realizes the great reduction of energy consumption; reboiler two only requires 50% heat duty steam for start-up operations.
Drawings
FIG. 1 is a schematic structural diagram of the present application;
1. rectifying tower 2, pipeline one 3, compressor 4 and pipeline two
5. Reboiler I6, side line 7, preheater II 8 and pipeline III
9. Material pipeline 10, preheater III 11, pipeline IV 12 and preheater I
13. Pipeline five 14, pipeline six 15, reboiler two 16, buffer tank
17. Condenser 18, gas-liquid separation tank 19 and second condenser
20. Side line I21, pipeline seven 22, pipeline eight 23 and pipeline nine
24. Line ten 25, valve.
Detailed Description
The following describes in detail a specific embodiment of the present invention with reference to fig. 1. It should be noted that the embodiments described herein are only for illustrating and explaining the present invention, and are not to be construed as limiting the present invention.
The first embodiment is as follows:
the application provides a heat pump rectifying device, which comprises a rectifying tower 1, wherein the top of the rectifying tower 1 is connected with a compressor 3 through a first pipeline 2, the compressor 3 is connected with a reboiler 5 through a second pipeline 4, the reboiler 5 adopts a falling film reboiler or a low-temperature high-efficiency reboiler, preferably, two parallel falling film reboilers or two parallel low-temperature high-efficiency reboilers are adopted, and the two parallel falling film reboilers or the two parallel low-temperature high-efficiency reboilers respectively have 50% load and work together; the bottom of every reboiler 5 is connected with rectifying column 1, reboiler 5 is connected with two 7 of pre-heater through lateral line 6, two 7 of pre-heater pass through pipeline three 8 and are connected with rectifying column 1, the gaseous phase at 1 top of the rectifying column is passed through compressor 3 compression, after raising pressure and temperature, supply heat to reboiler 5, after reboiler 5 heat transfer, gas becomes liquid, as the heat source of two 7 of pre-heater, this liquid is after two 7 of pre-heater, get into gas-liquid separation jar 18, noncondensable gas passes through two 19 coolings of condenser, gas gets into the tail gas absorption tower, liquid reflux to gas-liquid separation jar 18, liquid in the gas-liquid separation jar 18 is partly as the backward flow liquid of rectifying column 1, partly gets into one 12 of pre-heater and supplies heat to it.
The bottom of the rectifying tower 1 is connected with a third preheater 10 through a material pipeline 9, the third preheater 10 is connected with the rectifying tower 1 through a fourth pipeline 11, preferably, the fourth pipeline 11 is communicated with a third pipeline 8, materials in the tower kettle of the rectifying tower 1 have certain temperature and enter the third preheater 10 to be used as a heat source of the third preheater 10, and liquid in the tower kettle enters a biochemical treatment system for treatment after passing through the third preheater 10; the gas-liquid separation tank 18 is further connected with a rectifying tower 1 and a first preheater 12 respectively, the first preheater 12 is connected with a feeding pipeline, the first preheater 12 is connected with a second preheater 7 through a fifth pipeline 13, the fifth pipeline 13 is connected with a sixth pipeline 14, and the first preheater 12 is connected with a third preheater 10 through the fifth pipeline 13 and the sixth pipeline 14; the non-condensable gas preheated by the second preheater 7 enters a gas-liquid separation tank 18, the non-condensable gas enters a condenser II 19 and a tail gas absorption tower for treatment, liquid in the gas-liquid separation tank 18 serves as a heat source of the first preheater 12, and refined methanol is extracted from the top of the first preheater 12; the lower part of rectifying column 1 still is connected with reboiler two 15, reboiler two 15 adopts the thermosiphon reboiler, and thermosiphon reboiler 15 passes through steam heating, and in this embodiment, the thermosiphon reboiler needs 50% steam heat load to be used for the operation of driving, and the heat of above-mentioned falling film reboiler or low temperature high efficiency reboiler provides after compressor 3 compressed gas.
The material enters a first preheater 12 through a feeding pipeline for preheating, then enters a second preheater 7 through a fifth pipeline 13, enters a third preheater 10 through a sixth pipeline 14 for preheating again, and then flows into the rectifying tower 1 through a third pipeline 8 and a fourth pipeline 11 respectively.
Preferably, a buffer tank 16 is arranged between the first reboiler 5 and the second preheater 7 for buffering the flow rate to ensure the stable operation of the equipment.
Preferably, in order to further improve the economic benefit, the compressor 4 comprises a first compressor and a second compressor which are arranged in parallel, the first compressor and the second compressor are simultaneously used in parallel and are both at 50% of load, and when one of the compressors is maintained, the heat load of 50% steam of the thermosiphon reboiler is matched for start-up operation, so that the heat load of 100% load operation capacity is achieved.
The second embodiment:
the present embodiment defines a specific connection relationship of the gas-liquid separation tank 18, specifically:
the top of the gas-liquid separation tank 18 is connected with a second condenser 19, and gas phase which cannot be cooled by the second condenser 19 enters a tail gas absorption tower for treatment; the gas-liquid separation tank 18 is connected with the top of the second preheater 7 through a lateral line I20, the non-condensable gas at the top of the second preheater 7 enters the gas-liquid separation tank 18 for further treatment, the bottom of the gas-liquid separation tank 18 is connected with the bottom of the first preheater 12 through a pipeline eight 22, and the gas-liquid separation tank 18 is connected with the middle upper part of the rectifying tower 1 through a pipeline eight 22 and a pipeline nine 23.
The gas-liquid phase mixture at the top of the second preheater 7 enters a gas-liquid separation tank 18, a part of the liquid at the bottom of the gas-liquid separator 18 flows back to the rectifying tower 1, and a part of the liquid enters the first preheater 12 to supply heat to the rectifying tower.
Preferably, the gas-liquid separation tank 18 is connected with the compressor 3 through a pipeline eight 22 and a pipeline seven 21; the spraying function is realized, and the saturated steam is ensured to be supplied to the outlet of the compressor 3.
Preferably, the top of the rectifying tower 1 is connected with a gas-liquid separation tank 18 through a pipeline, and a condenser 17 is arranged on the pipeline; when the gas phase at the top of the rectifying tower 1 is more, the gas phase can be condensed by the condenser 17 and then enters the gas-liquid separation tank 18, a part of liquid at the bottom of the gas-liquid separation tank 18 flows back to the rectifying tower 1, and a part of liquid enters the first preheater 12 to supply heat to the rectifying tower, so that the utilization rate of materials is further improved.
Preferably, the material pipeline 9 is connected with the top of the reboiler I5 through a pipeline ten 24, a valve 25 is arranged on the material pipeline 9, the valve 25 is used for adjusting the circulation amount of the tower bottom material, and the material in the tower bottom of the rectifying tower 1 can enter the top of the reboiler I5 through the material pipeline 9 and the pipeline ten 24 to realize material circulation; the hot stream of the reboiler I5 enters through a pipeline II 4, the hot stream of the reboiler I5 flows out through a lateral line 6, the cold stream of the reboiler I5 enters through a pipeline ten 24, and the cold stream of the reboiler I5 flows into the tower bottom of the rectifying tower 1.
In the application, the average concentration of the residual liquid and the condensed water fed with methanol is 17.5 percent (v/v%), and the designed feed flow rate is 98m 3 H, average specific gravity of the feed is 0.9651; the device can operate under the load of 60-120% of the design capacity; the quality of the finished methanol product is as follows: the methanol content is more than or equal to 99.8 percent (wt percent), and the water content is less than or equal to 0.2 percent (wt percent); the content of methanol in the residual wastewater discharged from the tower bottom of the rectifying tower is less than or equal to 0.6 percent (wt percent); the method and the device fully consider the utilization of waste heat in the system, reduce the operating cost and furthest exert the economic benefit and the social benefit of the engineering.
This application adopts tertiary preheating, changes traditional rectification mode, with top of the tower gas through compressor compression, improve top of the tower gas's pressure and condensing temperature, as reboiler one and second heat source of preheater, the liquid after the heat supply to preheater two is as the heat source of preheater one, the material at the bottom of the rectifying column is as the heat source of preheater three, make full use of gaseous, the condensation latent heat of liquid, reduced the consumption of hot public works of tower cauldron and the cold public works in top of the tower simultaneously.
By adopting the scheme, compared with the prior rectification process, the energy consumed by the compressor is 20-40% of the energy directly consumed by the reboiler, so that the energy consumption is greatly reduced; the application improves the traditional process, and realizes the great reduction of energy consumption; reboiler two requires only 50% of the heat duty steam for start-up operations.
The connection among the above components is performed through pipelines and the like, and the arrangement of the corresponding pump body on the pipelines according to the situation is mature prior art and is not described in detail herein; the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are included in the scope of protection of the present invention.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present application will not be described separately.
In addition, any combination of the various embodiments of the present application can be made, and the application should be considered as the disclosure of the present application as long as the idea of the present application is not violated.
Claims (10)
1. The utility model provides a heat pump rectifying device, includes rectifying column (1), the top of rectifying column (1) is passed through pipeline one (2) and is connected with compressor (3), compressor (3) are connected with reboiler one (5) through pipeline two (4), and the bottom and rectifying column (1) of reboiler one (5) are connected, and reboiler one (5) are connected with preheater two (7) through siding (6), and preheater two (7) are connected with rectifying column (1) through pipeline three (8), its characterized in that, the top and the gas-liquid separation jar (18) of preheater two (7) are connected, gas-liquid separation jar (18) are connected with rectifying column (1) and preheater one (12) respectively and are connected, preheater one (12) are connected with preheater two (7), preheater three (10) respectively, preheater three (10) are connected with the well upper portion and the tower cauldron of rectifying column (1) respectively, the lower part of rectifying column (1) still is connected with reboiler two (15).
2. The heat pump rectification device according to claim 1, wherein a second condenser (19) is connected to the top of the gas-liquid separation tank (18).
3. A heat pump rectifying unit according to claim 1, characterized in that said gas-liquid separation tank (18) is connected to a compressor (3).
4. The heat pump rectification device according to claim 1, wherein a buffer tank (16) is arranged between the first reboiler (5) and the second preheater (7).
5. The heat pump rectifying device according to claim 1, wherein a material pipeline (9) between the bottom of the rectifying tower (1) and the third preheater (10) is provided with a ten-way pipeline (24), the ten-way pipeline (24) is connected with the top of the first reboiler (5), and the ten-way pipeline (24) is provided with a valve (25).
6. The heat pump rectification device according to claim 1, wherein the first reboiler (5) comprises two falling film reboilers arranged in parallel or two low temperature high efficiency reboilers arranged in parallel.
7. The heat pump rectification device according to claim 6, wherein the parallel falling film reboilers or the parallel low-temperature high-efficiency reboilers are used simultaneously, and respectively bear 50% of load.
8. The heat pump rectification device according to claim 1, wherein the second reboiler (15) is a thermosiphon reboiler.
9. The heat pump rectification device according to claim 1, wherein the compressor (3) comprises a first compressor and a second compressor arranged in parallel.
10. The heat pump rectification device according to claim 2, wherein the top of the rectification column (1) is connected with a gas-liquid separation tank (18) through a pipeline, and a condenser (17) is arranged on the pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223398071.0U CN218653048U (en) | 2022-12-09 | 2022-12-09 | Heat pump rectifying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223398071.0U CN218653048U (en) | 2022-12-09 | 2022-12-09 | Heat pump rectifying device |
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| CN218653048U true CN218653048U (en) | 2023-03-21 |
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| CN202223398071.0U Active CN218653048U (en) | 2022-12-09 | 2022-12-09 | Heat pump rectifying device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116692775A (en) * | 2023-07-12 | 2023-09-05 | 深圳市超纯环保股份有限公司 | Low-concentration hydrofluoric acid waste liquid recovery equipment |
-
2022
- 2022-12-09 CN CN202223398071.0U patent/CN218653048U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116692775A (en) * | 2023-07-12 | 2023-09-05 | 深圳市超纯环保股份有限公司 | Low-concentration hydrofluoric acid waste liquid recovery equipment |
| CN116692775B (en) * | 2023-07-12 | 2024-05-07 | 深圳市超纯环保股份有限公司 | Low-concentration hydrofluoric acid waste liquid recovery equipment |
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