CN113198299B - Two-stage air compression and drying system and working method thereof - Google Patents
Two-stage air compression and drying system and working method thereof Download PDFInfo
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- CN113198299B CN113198299B CN202110428976.9A CN202110428976A CN113198299B CN 113198299 B CN113198299 B CN 113198299B CN 202110428976 A CN202110428976 A CN 202110428976A CN 113198299 B CN113198299 B CN 113198299B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation 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
- B01D53/26—Drying gases or vapours
- B01D53/263—Drying gases or vapours by absorption
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B25/00—Multi-stage pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/80—Water
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Abstract
The utility model provides a two-stage air compression and drying system, including the one-level compressor, the second grade compressor, solution system and heat pump system, wherein solution system includes the drying tower, the concentrated tower, the vacuum pump, first solution pump, second solution pump and control flap, heat pump system includes, the evaporimeter, the condensing coil, heat pump compressor and choke valve, the one-level compressor export is through evaporimeter connection drying tower gas inlet, drying tower gas outlet connects the second grade compressor entry, first solution pump export is through first heat exchanger in proper order, second heat exchanger and ejector are connected to the concentrated tower, concentrated tower solution export is connected to the ejector through the valve all the way, another way is connected to drying tower bottom solution entry through second solution pump. According to the invention, the drying tower is arranged at the air outlet of the primary compressor, so that a large amount of moisture in the compressed air can be effectively removed, the energy consumption of the secondary compressor is reduced, the energy efficiency of the compressor is improved, the exhaust heat of the compressor is recovered through the heat pump, and the energy consumption of the solution concentration process can be effectively reduced.
Description
Technical Field
The invention relates to the field of compressed air drying, in particular to a two-stage air compression and drying system and a working method thereof.
Background
Compressed air is the main power source of pneumatic tools and is supplied without leaving the compressor. When the air has a certain moisture content, the dew point temperature of the air increases with the increase in pressure, and if the drying process is not performed, a series of adverse effects are caused.
Common methods of compressed air drying are freezing, adsorption and absorption. The freezing method is a drying method which is relatively energy-saving, but the dew point temperature of the processed dry air cannot be lower than 0 ℃, and the freezing method is only suitable for occasions with low requirements on the dew point temperature of the compressed air. The adsorption method can effectively remove moisture in the compressed air and obtain the compressed air with the dew point temperature of-70 ℃, but the regeneration of the adsorbent needs to consume a large amount of heat. The absorption method can obtain compressed air with dew point temperature of-20 ℃, the temperature of the absorbent can be increased after absorbing water vapor, the concentration is reduced, the moisture absorption capacity is also rapidly reduced, regeneration concentration is required, and the regeneration temperature is relatively lower than that of the absorption method. At present, in order to improve the energy efficiency of the compressor, a two-stage compression and intermediate cooling method is generally adopted, and reasonably reducing the temperature and the humidity of inlet air of the compressor can effectively reduce the energy consumption of the compressor and improve the efficiency of the compressor. However, most of the heat of the compressor exhaust is directly discharged as waste heat, which causes great energy waste.
Therefore, how to combine the air drying and the compressor waste heat recovery is a problem to be solved.
Disclosure of Invention
The present invention addresses the above-mentioned problems by providing a two-stage air compression and drying system.
In order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:
a two-stage air compression and drying system comprises a first-stage compressor 3, a second-stage compressor 5, a solution system and a heat pump system, wherein the solution system comprises a drying tower 1, a concentration tower 2, a first heat exchanger 6, a first solution pump 7, a vacuum pump 8, a second solution pump 10, a second heat exchanger 11, a cooler 12 and an ejector 13; the heat pump system comprises an evaporator 4, a heat pump compressor 9, a condensing coil 14 and a throttle valve 15;
the outlet of the primary compressor 3 is connected to the air inlet a of the drying tower 1 through the evaporator 4, the air outlet b of the drying tower 1 is connected to the inlet of the secondary compressor 5 through a pipeline, the outlet of the secondary compressor 5 is connected to the air side inlet d of the first heat exchanger 6 through a pipeline, and the outlet e of the first heat exchanger 6 is connected to a high-pressure air user;
a first filter layer 1a, a first spraying port 1c, a packing layer 1b and a first concentration controller 24 are sequentially arranged in the drying tower 1 from top to bottom, and a second filter layer 2a, a second spraying port 2b, a condensing coil 14 and a second concentration controller 25 are sequentially arranged in the concentrating tower 2 from top to bottom; a solution outlet c at the bottom of the drying tower 1 is connected to an inlet of a first solution pump 7 through a first electromagnetic valve 19, an outlet of the first solution pump 7 is connected to a solution side inlet f of a first heat exchanger 6 through a first regulating valve 17, a solution side outlet g of the first heat exchanger 6 is connected to a low-temperature solution side inlet h of a second heat exchanger 11 through a pipeline, a low-temperature solution side outlet i of the second heat exchanger 11 is connected to an axial inlet m of an ejector 13 through a pipeline, an axial outlet n of the ejector 13 is connected to a second spraying port 2b of a concentration tower 2 through a pipeline, a gas outlet p at the top of the concentration tower 2 is connected to an inlet of a vacuum pump 8 through a second electromagnetic valve 20, a solution outlet q at the side of the concentration tower 2 is connected to a radial inlet o of the ejector 13 through a second regulating valve 18, a solution outlet r at the bottom of the concentration tower 2 is connected to an inlet of a second solution pump 10 through a third electromagnetic valve 21, an outlet of the second solution pump 10 is connected to a high-temperature solution side inlet k of the second heat exchanger 11 through a pipeline, a high-temperature solution side outlet j of the second heat exchanger 11 is connected to an inlet of a cooler 12, and an outlet of the cooler 12 is connected to an outlet of the drying tower 1c through a third regulating valve 16;
the outlet of the condensing coil 14 is connected with the inlet of the evaporator 4 through a throttle valve 15, the outlet of the evaporator 4 is connected with the inlet of the heat pump compressor 9 through a pipeline, and the outlet of the heat pump compressor 9 is connected with the inlet of the condensing coil 14 in the concentration tower 2 through a pipeline.
Further preferably, the first concentration controller 24 is connected to the third regulating valve 16 through a wire; the second concentration controller 25 is connected to the second regulating valve 18 through a wire;
further preferably, a first temperature controller 22 is arranged on a pipeline between the air inlet a of the drying tower 1 and the evaporator 4, and the first temperature controller 22 is connected to the throttle valve 15 through a lead; a second temperature controller 23 is arranged on a pipeline between the outlet of the cooler 12 and the third regulating valve 16, and the second temperature controller 23 is connected to the cooler 12 through a lead;
further preferably, the drying tower 1 is connected to the first regulating valve 17 through a wire.
The working method of the two-stage air compression and drying system provided by the invention has three working processes:
before use, setting values of the first temperature controller 22, the second temperature controller 23, the first concentration controller 24 and the second concentration controller 25 according to use requirements; starting the system, and starting the primary compressor 3, the secondary compressor 5, the first solution pump 7, the second solution pump 10, the vacuum pump 8, the first electromagnetic valve 19, the second electromagnetic valve 20 and the third electromagnetic valve 21;
and (3) air drying process: the air is compressed by a primary compressor 3, heated and pressurized, then enters an evaporator 4 for heat release and cooling, then enters a drying tower 1 for heat and mass transfer with a drying solution to remove moisture, the dried air is discharged to a secondary compressor 5 for further compression through a gas outlet b at the top of the drying tower 1, then enters a first heat exchanger 6 for heat release and cooling, and then is sent to rear-end equipment;
and (3) solution concentration process: the solution in the drying tower 1 enters a first solution pump 7 through a first electromagnetic valve 19 to be pressurized, then enters a first heat exchanger 6 through a first regulating valve 17 to be subjected to heat absorption and temperature rise, then enters a second heat exchanger 11 to be further heated, then enters a concentration tower 2 through an ejector 13 to be sprayed through a second spraying port 2b, and exchanges heat with a condensation coil pipe 14 in the concentration tower 2, a large amount of water in the high-temperature solution is analyzed and discharged, and water vapor is discharged through a gas outlet p at the top of the concentration tower 2, sucked by a vacuum pump 8 through a second electromagnetic valve 20 and exhausted to the environment; part of the solution in the concentration tower 2 enters the ejector 13 through the second regulating valve 18 to be mixed with the high-temperature dilute solution, the other part of the solution enters the second solution pump 10 through the third electromagnetic valve 21 to be pressurized, then enters the second heat exchanger 11 to release heat and cool, then enters the cooler 12 to be further cooled, and finally enters the drying tower 1 through the third regulating valve 16 to be sprayed through the first spraying port 1c;
the heat pump cycle process: the heat pump circulating working medium is compressed by the heat pump compressor 9 and then enters the condensing coil 14 to release heat and condense, the condensed liquid circulating working medium enters the evaporator 4 through the throttle valve 15 to absorb heat and evaporate, and then the gaseous circulating working medium enters the heat pump compressor 9 to be compressed and carries out the next circulation;
further preferably, the valve opening degree of the first regulating valve 17 is in a direct proportional relation with the liquid level in the drying tower 1;
further preferably, the valve opening of the third regulating valve 16 is in inverse proportion relation with the concentration of the solution in the drying tower 1; the valve opening of the second regulating valve 18 is in inverse proportional relation with the concentration of the solution in the concentration tower 2;
further preferably, the opening of the throttle valve 15 is in direct proportion to the temperature of the compressed air at the outlet of the evaporator 4;
further preferably, the fan frequency of the cooler 12 is proportional to the outlet temperature.
Compared with the prior art, the technical scheme of the invention has the following technical effects:
according to the invention, the solution drying system is arranged between the two stages of compressors, so that the temperature and the humidity of the air at the inlet of the two stages of compressors are reduced, the energy consumption of the compressors can be effectively reduced, the compression efficiency is improved, the compressed air system is more energy-saving, and the prepared compressed air can meet the use requirements of most occasions. The heat exchanger is utilized to preheat dilute solution, and the exhaust heat of the compressor is recovered through the heat pump for solution regeneration, so that the regeneration energy consumption can be effectively reduced, the energy waste is avoided, the energy utilization rate of a compressed air system can be further improved, and the complete regeneration of the solution is ensured.
Drawings
FIG. 1 is a schematic diagram of the structural configuration of the present invention:
in the figure: the system comprises a drying tower, a first filtering layer 1a, a packing layer 1b, a first spraying port 1c, a concentration tower 2, a second filtering layer 2a, a second spraying port 2b, a first-stage compressor 3, an evaporator 4, a second-stage compressor 5, a first heat exchanger 6, a first solution pump 7, a vacuum pump 8, a heat pump compressor 9, a second solution pump 10, a second heat exchanger 11, a cooler 12, an ejector 13, a condensing coil 14, a throttle valve 15, a third regulating valve 16, a first regulating valve 17, a second regulating valve 18, a first electromagnetic valve 19, a second electromagnetic valve 20, a third electromagnetic valve 21, a first temperature sensor 22, a second temperature sensor 23, a first concentration controller 24 and a second concentration controller 25.
Detailed Description
In order to make the purpose and technical solution of the embodiments of the present invention clearer, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
As shown in fig. 1, a two-stage air compression and drying system of the present invention includes a one-stage compressor 3, a two-stage compressor 5, a solution system and a heat pump system, wherein the solution system includes a drying tower 1, a concentrating tower 2, a first heat exchanger 6, a first solution pump 7, a vacuum pump 8, a second solution pump 10, a second heat exchanger 11, a cooler 12 and an ejector 13; the heat pump system comprises an evaporator 4, a heat pump compressor 9, a condensing coil 14 and a throttle valve 15;
the outlet of the primary compressor 3 is connected to the air inlet a of the drying tower 1 through the evaporator 4, the air outlet b of the drying tower 1 is connected to the inlet of the secondary compressor 5 through a pipeline, the outlet of the secondary compressor 5 is connected to the air side inlet d of the first heat exchanger 6 through a pipeline, and the outlet e of the first heat exchanger 6 is connected to a high-pressure air user;
a first filter layer 1a, a first spraying port 1c, a packing layer 1b and a first concentration controller 24 are sequentially arranged in the drying tower 1 from top to bottom, and a second filter layer 2a, a second spraying port 2b, a condensing coil 14 and a second concentration controller 25 are sequentially arranged in the concentrating tower 2 from top to bottom; a solution outlet c at the bottom of the drying tower 1 is connected to an inlet of a first solution pump 7 through a first electromagnetic valve 19, an outlet of the first solution pump 7 is connected to a solution side inlet f of a first heat exchanger 6 through a first regulating valve 17, a solution side outlet g of the first heat exchanger 6 is connected to a low-temperature solution side inlet h of a second heat exchanger 11 through a pipeline, a low-temperature solution side outlet i of the second heat exchanger 11 is connected to an axial inlet m of an ejector 13 through a pipeline, an axial outlet n of the ejector 13 is connected to a second spraying port 2b of a concentration tower 2 through a pipeline, a gas outlet p at the top of the concentration tower 2 is connected to an inlet of a vacuum pump 8 through a second electromagnetic valve 20, a solution outlet q at the side of the concentration tower 2 is connected to a radial inlet o of the ejector 13 through a second regulating valve 18, a solution outlet r at the bottom of the concentration tower 2 is connected to an inlet of a second solution pump 10 through a third electromagnetic valve 21, an outlet of the second solution pump 10 is connected to a high-temperature solution side inlet k of the second heat exchanger 11 through a pipeline, a high-temperature solution side outlet j of the second heat exchanger 11 is connected to an inlet of a cooler 12, and an outlet of the cooler 12 is connected to a first regulating valve 16 of the drying tower 1;
the outlet of the condensing coil 14 is connected with the inlet of the evaporator 4 through a throttle valve 15, the outlet of the evaporator 4 is connected with the inlet of the heat pump compressor 9 through a pipeline, and the outlet of the heat pump compressor 9 is connected with the inlet of the condensing coil 14 in the concentration tower 2 through a pipeline;
the control signal of the first concentration controller 24 is connected to the third regulating valve 16; the control signal of the second concentration controller 25 is connected to the second regulating valve 18;
a first temperature controller 22 is arranged on a pipeline between the air inlet a of the drying tower 1 and the evaporator 4, and the first temperature controller 22 is connected to the throttle valve 15 through a lead; a second temperature controller 23 is arranged on a pipeline between the outlet of the cooler 12 and the third regulating valve 16, and the second temperature controller 23 is connected to the cooler 12 through a lead;
the drying tower 1 is connected with a first regulating valve 17 through a lead.
The working method of the two-stage air compression and drying system provided by the invention has three working processes:
before use, setting values of the first temperature controller 22, the second temperature controller 23, the first concentration controller 24 and the second concentration controller 25 according to use requirements; starting the system, and starting the primary compressor 3, the secondary compressor 5, the first solution pump 7, the second solution pump 10, the vacuum pump 8, the first electromagnetic valve 19, the second electromagnetic valve 20 and the third electromagnetic valve 21;
and (3) air drying process: the wet air is compressed by a primary compressor 3, enters an evaporator 4 to exchange heat with a refrigerant, is cooled, enters a drying tower 1 to transfer heat and mass with a drying solution to remove moisture, a large amount of moisture in the wet air is absorbed by the solution, the dried air is discharged to a secondary compressor 5 through a gas outlet b at the top of the drying tower 1 to be further compressed, then enters a first heat exchanger 6 to exchange heat with a low-temperature dilute solution, and is sent to rear-end equipment after being cooled;
and (3) solution concentration process: the solution in the drying tower 1 enters a first solution pump 7 through a first electromagnetic valve 19 for pressurization, then enters a first heat exchanger 6 through a first regulating valve 17 for heat exchange with high-temperature drying air, enters a second heat exchanger 11 for heat exchange with high-temperature concentrated solution after primary temperature rise, further rises the temperature, enters a concentration tower 2 through an ejector 13 for spraying through a second spraying port 2b, exchanges heat with a condensing coil 14 in the concentration tower 2, a large amount of water in the high-temperature solution is analyzed out, under the action of a vacuum pump 8, water vapor is discharged through a gas outlet p at the top of the concentration tower 2, is sucked by the vacuum pump 8 through a second electromagnetic valve 20 and is exhausted to the environment; part of solution in the concentration tower 2 enters the ejector 13 through the second regulating valve 18 to be mixed with the high-temperature dilute solution, then enters the concentration tower 2 for further regeneration, the other part of solution enters the second solution pump 10 through the third electromagnetic valve 21 for pressurization, then enters the second heat exchanger 11 for heat exchange with the dilute solution, enters the cooler 12 for further cooling after preliminary cooling, then enters the drying tower 1 through the third regulating valve 16 for spraying through the first spraying port 1c, and transfers heat and mass with the compressed air to separate out moisture in the compressed air;
the heat pump cycle process: the heat pump circulating working medium is compressed by the heat pump compressor 9 and then enters the condensing coil 14 to release heat and condense, the condensed liquid circulating working medium enters the evaporator 4 through the throttle valve 15 to absorb heat and evaporate, and then the gaseous circulating working medium enters the heat pump compressor 9 to be compressed and carries out the next circulation;
the valve opening of the first regulating valve 17 is in a direct proportional relation with the liquid level in the drying tower 1, and when the liquid level of the solution in the drying tower 1 rises, the valve opening of the first regulating valve 17 needs to be increased so as to ensure the stability of the liquid level of the solution in the drying tower 1;
the valve opening of the third regulating valve 16 is in inverse proportional relation with the concentration of the solution in the drying tower 1, and when the concentration of the solution in the drying tower 1 is increased, the valve opening of the third regulating valve 16 is reduced to ensure the stability of the drying effect in the drying tower 1; the valve opening of the second regulating valve 18 is in inverse proportional relation with the concentration of the solution in the concentration tower 2, and when the concentration of the solution in the concentration tower 2 is increased, the valve opening of the second regulating valve 18 is reduced to ensure that the solution is completely regenerated.
The opening of the throttle valve 15 is in direct proportion to the temperature of the compressed air at the outlet of the evaporator 4, when the temperature of the compressed air rises, the opening of the throttle valve 15 is increased, and the flow of the refrigerant is increased, so that the temperature of the compressed air is reduced to a set temperature, and the drying requirement is met;
the fan frequency of the cooler 12 is in a direct proportional relation with the outlet temperature, and when the temperature of the solution at the outlet of the cooler 12 is increased, the fan frequency is increased to ensure that the temperature of the solution is reduced to a set temperature to meet the drying requirement.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected by one skilled in the art without departing from the spirit and scope of the invention, and it is intended that the scope of the invention be limited only by the claims appended hereto.
Claims (9)
1. A two-stage air compression and drying system is characterized by comprising a primary compressor (3), a secondary compressor (5), a solution system and a heat pump system, wherein the solution system comprises a drying tower (1), a concentration tower (2), a first heat exchanger (6), a first solution pump (7), a vacuum pump (8), a second solution pump (10), a second heat exchanger (11), a cooler (12) and an ejector (13); the heat pump system comprises an evaporator (4), a heat pump compressor (9), a condensing coil (14) and a throttle valve (15);
the outlet of the primary compressor (3) is connected to an air inlet a of the drying tower (1) through an evaporator (4), an air outlet b of the drying tower (1) is connected to an inlet of a secondary compressor (5) through a pipeline, an outlet of the secondary compressor (5) is connected to an air side inlet d of a first heat exchanger (6) through a pipeline, and an outlet e of the first heat exchanger (6) is connected to a high-pressure air user;
a first filter layer (1 a), a first spraying opening (1 c), a packing layer (1 b) and a first concentration controller (24) are sequentially arranged in the drying tower (1) from top to bottom, and a second filter layer (2 a), a second spraying opening (2 b), a condensing coil (14) and a second concentration controller (25) are sequentially arranged in the concentrating tower (2) from top to bottom; a solution outlet c at the bottom of the drying tower (1) is connected to an inlet of a first solution pump (7) through a first electromagnetic valve (19), an outlet of the first solution pump (7) is connected to a solution side inlet f of a first heat exchanger (6) through a first regulating valve (17), a solution side outlet g of the first heat exchanger (6) is connected to a low-temperature solution side inlet h of a second heat exchanger (11) through a pipeline, a low-temperature solution side outlet i of the second heat exchanger (11) is connected to an axial inlet m of an ejector (13) through a pipeline, an axial outlet n of the ejector (13) is connected to a second spraying port (2 b) of the concentration tower (2) through a pipeline, a gas outlet p at the top of the concentration tower (2) is connected to an inlet of a vacuum pump (8) through a second electromagnetic valve (20), a solution outlet q at the side of the concentration tower (2) is connected to a radial inlet o of an ejector (13) through a second regulating valve (18), a solution outlet r at the bottom of the concentration tower (2) is connected to an inlet of a second solution pump (10) through a third electromagnetic valve (21), an outlet of the second solution pump (10) is connected to a high-temperature solution side inlet k of a second heat exchanger (11) through a pipeline, a high-temperature solution side outlet j of the second heat exchanger (11) is connected to an inlet of a cooler (12), and an outlet of the cooler (12) is connected to a first spraying port (1 c) of the drying tower (1) through a third regulating valve (16);
the outlet of the condensing coil (14) is connected with the inlet of the evaporator (4) through a throttle valve (15), the outlet of the evaporator (4) is connected with the inlet of the heat pump compressor (9) through a pipeline, and the outlet of the heat pump compressor (9) is connected with the inlet of the condensing coil (14) in the concentration tower (2) through a pipeline.
2. A two-stage air compression and drying system according to claim 1, characterised in that said first consistency controller (24) is connected to the third regulating valve (16) by means of a wire; the second concentration controller (25) is connected to the second regulating valve (18) through a wire.
3. A two-stage air compression and drying system according to claim 2, characterised in that a first temperature controller (22) is provided on the line between the air inlet a and the evaporator (4) of the drying tower (1), the first temperature controller (22) being connected to the throttle valve (15) by means of a wire; and a second temperature controller (23) is arranged on a pipeline between the outlet of the cooler (12) and the third regulating valve (16), and the second temperature controller (23) is connected to the cooler (12) through a lead.
4. A two-stage air compression and drying system according to claim 3, characterised in that the drying tower (1) is connected to the first regulating valve (17) by means of a wire.
5. The method of operating a two-stage air compression and drying system of claim 4, wherein there are three operating processes:
before use, setting values of a first temperature controller (22), a second temperature controller (23), a first concentration controller (24) and a second concentration controller (25) according to use requirements; starting a system, and starting a primary compressor (3), a secondary compressor (5), a first solution pump (7), a second solution pump (10), a vacuum pump (8), a first electromagnetic valve (19), a second electromagnetic valve (20) and a third electromagnetic valve (21);
and (3) air drying process: the air is compressed by a primary compressor (3), heated and pressurized, then enters an evaporator (4) for heat release and cooling, then enters a drying tower (1) for heat and mass transfer with a drying solution to remove moisture, the dried air is discharged to a secondary compressor (5) for further compression through a gas outlet b at the top of the drying tower (1), then enters a first heat exchanger (6) for heat release and cooling, and then is sent to rear-end equipment;
and (3) solution concentration process: the solution in the drying tower (1) enters a first solution pump (7) through a first electromagnetic valve (19) for pressurization, then enters a first heat exchanger (6) through a first regulating valve (17) for heat absorption and temperature rise, then enters a second heat exchanger (11) for further temperature rise, then enters a concentration tower (2) through an ejector (13) for spraying through a second spraying port (2 b), exchanges heat with a condensation coil pipe (14) in the concentration tower (2), a large amount of water in the high-temperature solution is analyzed, water vapor is discharged through a gas outlet p at the top of the concentration tower (2), is sucked by a vacuum pump (8) after passing through a second electromagnetic valve (20), and is exhausted to the environment; part of solution in the concentration tower (2) enters an ejector (13) through a second regulating valve (18) to be mixed with the high-temperature dilute solution, the other part of solution enters a second solution pump (10) through a third electromagnetic valve (21) to be pressurized, then enters a second heat exchanger (11) to release heat and cool, then enters a cooler (12) to be further cooled, and finally enters a drying tower (1) through a third regulating valve (16) to be sprayed through a first spraying port (1 c);
the heat pump cycle process: the heat pump circulating working medium is compressed by the heat pump compressor (9) and then enters the condensing coil (14) to release heat for condensation, the condensed liquid circulating working medium enters the evaporator (4) through the throttle valve (15) to absorb heat for evaporation, and then the gas circulating working medium enters the heat pump compressor (9) to be compressed and then is circulated in the next step.
6. A method of operating a two-stage air compression and drying system according to claim 5, characterised in that the valve opening of the first regulating valve (17) is proportional to the liquid level in the drying tower (1).
7. A method according to claim 5, characterized in that the valve opening of the third control valve (16) is inversely proportional to the concentration of the solution in the drying tower (1); the valve opening of the second regulating valve (18) is in inverse proportion to the concentration of the solution in the concentration tower (2).
8. A method of operating a two-stage air compression and drying system according to claim 5, characterised in that the throttle valve (15) valve opening is proportional to the evaporator (4) outlet compressed air temperature.
9. A method of operating a two-stage air compression and drying system as claimed in claim 5, wherein the chiller (12) fan frequency is directly proportional to the outlet temperature.
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| DE102016210478A1 (en) * | 2016-06-14 | 2017-12-14 | Evonik Degussa Gmbh | Method for dehumidifying moist gas mixtures |
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| CN109579354A (en) * | 2018-12-10 | 2019-04-05 | 安徽金禾实业股份有限公司 | A kind of method that nitric acid production enters stove air cooling and drying |
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Effective date of registration: 20230731 Address after: A6, Suhong Industrial Building, No. 81 Suhong West Road, Suzhou Industrial Park, Jiangsu Province, 215127 Patentee after: Yikuaipu (Suzhou) Thermal Energy Environmental Protection Equipment Co.,Ltd. Address before: 212003, No. 2, Mengxi Road, Zhenjiang, Jiangsu Patentee before: JIANGSU University OF SCIENCE AND TECHNOLOGY |