CN116422113A - Temperature and pressure swing adsorption dry air production system and operation method thereof - Google Patents
Temperature and pressure swing adsorption dry air production system and operation method thereof Download PDFInfo
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- CN116422113A CN116422113A CN202310513431.7A CN202310513431A CN116422113A CN 116422113 A CN116422113 A CN 116422113A CN 202310513431 A CN202310513431 A CN 202310513431A CN 116422113 A CN116422113 A CN 116422113A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
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- 239000011248 coating agent Substances 0.000 claims description 3
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- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 3
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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
- B01D53/261—Drying gases or vapours by adsorption
-
- 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
- B01D53/02—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 by adsorption, e.g. preparative gas chromatography
- B01D53/04—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 by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/0462—Temperature swing adsorption
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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
- B01D53/02—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 by adsorption, e.g. preparative gas chromatography
- B01D53/04—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 by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/047—Pressure swing adsorption
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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
- B01D53/265—Drying gases or vapours by refrigeration (condensation)
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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
- B01D53/28—Selection of materials for use as drying agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/345—Regenerating or reactivating using a particular desorbing compound or mixture
- B01J20/3458—Regenerating or reactivating using a particular desorbing compound or mixture in the gas phase
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2258/00—Sources of waste gases
- B01D2258/06—Polluted air
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Abstract
The invention discloses a temperature and pressure swing adsorption dry air production system and an operation method thereof, and relates to the technical field of air drying. The invention reduces the adsorption pressure and the regeneration temperature of the system under the condition of satisfying the condition of high-efficiency stable production of the dry air with the dew point temperature as low as-70 ℃, effectively reduces the operation energy consumption and the operation maintenance cost, and further improves the energy utilization efficiency by utilizing the waste heat of the regenerated exhaust gas and the heating of the high-temperature heat pump/solar heat collector during the regeneration of the system.
Description
Technical Field
The invention relates to the technical field of air drying, in particular to a temperature and pressure swing adsorption dry air production system and an operation method thereof.
Background
In the scenes of precision instruments, electronic industry, low-temperature industry, raw gas purification and the like, strict requirements are made on the moisture content of air, for example, the liquid injection and formation workshops of lithium batteries require that the dew point temperature of the ambient air be below-40 ℃, and the moisture content of dry air is higher in some precision workshops or laboratories. If the air moisture content exceeds the standard, the action precision of the instrument or the quality of the product may not reach the standard, and serious economic loss is caused.
For industrial and experimental application scenarios requiring extremely dry air, the currently commonly employed dehumidification methods include freeze dehumidification and adsorption dehumidification. The air temperature needs to be reduced below the condensation temperature corresponding to the required moisture content of the dry air, the dry air with the dew point below-40 ℃ often needs to be deeply cooled, the air needs to be reheated to meet the air supply requirement, the process is complex, and a large amount of energy is wasted, so that the air is often subjected to primary drying by utilizing the freeze dehumidification in practical application, and then is further dried by adopting the adsorption dehumidification. Adsorption dehumidification includes liquid adsorption and solid adsorption dehumidification, where the former is often used in comfort dehumidification systems, extremely dry air is difficult to obtain, and there are droplet entrainment and corrosion problems; the solid adsorption dehumidification is usually realized based on a dehumidification rotating wheel, an adsorption tower or a dehumidification heat exchanger, and the requirement of deep dehumidification can be met by adopting a temperature-changing or pressure-changing adsorption technology. However, the pure temperature swing adsorption dehumidification heating regeneration process has higher energy consumption, long operation time and large initial system investment; the adsorption pressure in pressure swing adsorption dehumidification is often as high as several or even tens of atmospheric pressures, the energy consumption in the air compression process is huge, the system switching period is short, and high requirements are put on the reliability of valves, control systems and drying agents.
Therefore, those skilled in the art are working to develop a temperature and pressure swing adsorption dry air production system and an operation method thereof, which combine the multistage dehumidification and the temperature and pressure swing solid adsorption dehumidification principle, can remarkably reduce the operation energy consumption of the system, improve the dehumidification efficiency and the energy utilization efficiency, and make the system operate efficiently and stably.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention is directed to improving the energy utilization efficiency in the production of dry air.
In order to achieve the above object, the invention provides a temperature and pressure swing adsorption dry air production system, which is characterized by comprising a condensation dehumidification subsystem, an air compression subsystem and a pressure swing adsorption subsystem, wherein the condensation dehumidification subsystem comprises an inlet filter, a surface air cooler and a gas-water separator which are sequentially connected end to end through an air pipe, the air compression subsystem comprises a blower and a back-cooling device which are sequentially connected end to end through an air pipe, the pressure swing adsorption subsystem comprises a first dehumidifier, a second dehumidifier, a first adsorption tower, a second adsorption tower and a regeneration fan, the back-cooling device is connected with a dehumidification inlet of the first dehumidifier through a first inlet air valve, a dehumidification outlet of the first dehumidifier is connected with a dehumidification inlet of the second dehumidifier, a dehumidification outlet of the second dehumidifier is connected with a first port of the second adsorption tower through a fifth one-way air valve, a second port of the first adsorption tower is connected with a decompression air valve, a second port of the second adsorption tower is connected with a regeneration air valve through a second one-way air valve, a decompression air valve is further connected with a regeneration air valve, a regeneration air valve is further connected with a regeneration air valve through a decompression air valve, the regeneration air valve is further connected with a regeneration air valve through a second one-way valve, the regeneration air valve is further connected with a regeneration air valve through a decompression air valve, the regeneration air valve is further connected with the regeneration air valve through a second one-way valve, and the regeneration air valve is connected with the regeneration air valve through a decompression air valve, the first port of the second adsorption tower is connected to the regeneration inlet of the second dehumidifier through a sixth one-way air valve, the outlet of the regeneration fan is also connected to the second port of the first adsorption tower through a third one-way air valve, the first port of the first adsorption tower is connected to the regeneration inlet of the second dehumidifier through a second one-way air valve, the regeneration outlet of the second dehumidifier is connected to the regeneration inlet of the first dehumidifier after passing through the second heat regenerator, and the regeneration outlet of the first dehumidifier is connected with the external environment after passing through a regeneration exhaust valve and the first heat regenerator in sequence.
Further, an outlet of the product air valve is connected with an inlet of the outlet filter, a channel of air pipe is further arranged between an inlet of the first inlet air valve and a dehumidifying inlet of the second dehumidifier, a second inlet air valve is arranged on the air pipe, and a bypass exhaust valve is further arranged between a regeneration outlet of the second dehumidifier and the second regenerator.
Further, the pressure swing adsorption system further comprises a regeneration hot water tank, a hot water outlet of the regeneration hot water tank is connected to a regeneration hot water pipe inlet of the second dehumidifier, a regeneration hot water pipe outlet of the second dehumidifier is connected to a regeneration hot water pipe inlet of the first dehumidifier, and a regeneration hot water pipe outlet of the first dehumidifier is connected to a hot water inlet of the regeneration hot water tank.
Further, the pressure swing suction aconite system also comprises a heat supply device, wherein the heat supply device is connected with the regenerated hot water tank, and the heat supply device is a solar heat collector or a high-temperature heat pump.
Further, the first dehumidifier and the second dehumidifier both comprise two dehumidification heat exchangers, and the dehumidification heat exchangers are made by coating molecular sieve drying agents on the surfaces of the tube-fin heat exchangers.
Further, the dry air production system further comprises a water chilling unit, wherein the water chilling unit supplies water to the surface cooler, the aftercooler, the first dehumidifier and the second dehumidifier through a chilled water pump.
Further, the drying agent in the first adsorption tower and the second adsorption tower is one or a combination of several of active carbon, active alumina, artificial zeolite and 13X molecular sieve.
The operation method of the temperature and pressure swing adsorption dry air production system is characterized by comprising a dehumidification regeneration mode, wherein in the dehumidification regeneration mode, a first inlet air valve, a first one-way air valve, a fourth one-way air valve, a product air valve, a regeneration pressure reducing valve, a backheating air valve, a heating air valve, a sixth one-way air valve, a seventh one-way air valve and a regeneration exhaust valve are in an open state; the second inlet air valve, the second one-way air valve, the third one-way air valve, the fifth one-way air valve, the eighth one-way air valve, the cold air valve and the bypass air valve are in a closed state.
Further, the operation method further comprises a dehumidification cold blowing mode, wherein in the dehumidification cold blowing mode, the first inlet air valve, the second inlet air valve, the first one-way air valve, the fourth one-way air valve, the product air valve, the regeneration pressure reducing valve, the cold blowing air valve, the sixth one-way air valve, the seventh one-way air valve, the bypass exhaust valve and the regeneration exhaust valve are in an open state; the second one-way air valve, the third one-way air valve, the fifth one-way air valve, the eighth one-way air valve, the backheating air valve and the heating air valve are in a closed state.
Further, after passing through the dehumidification regeneration mode and the dehumidification cold blowing mode, the second one-way air valve, the third one-way air valve, the fifth one-way air valve and the eighth one-way air valve are opened, and the first one-way air valve, the fourth one-way air valve, the sixth one-way air valve and the seventh one-way air valve are closed, so that the first adsorption tower enters a regeneration state and the second adsorption tower enters a dehumidification state, and continuous operation of the system is realized.
The existing deep dehumidification usually adopts single temperature change or pressure swing adsorption dehumidification, the energy consumption in the heating regeneration or air compression process is huge, the operation condition is harsh, and the production cost of the extremely low dew point air is high. According to the invention, a temperature and pressure swing adsorption principle is introduced, multistage dehumidification and graded serial regeneration are combined, adsorption dehumidification load and energy loss are obviously reduced, the running temperature and pressure of the system are effectively reduced, and meanwhile, the system further improves the energy utilization efficiency through the utilization of regenerated waste heat and the combination of the regenerated waste heat and a high-temperature heat pump/solar heat collector. Temperature and pressure swing adsorption regenerates at relatively high pressure and low temperature and relatively low pressure and high temperature, avoiding the need for high temperature or high pressure for single temperature or pressure swing adsorption; meanwhile, the adsorption dehumidification load is reduced by multistage dehumidification, and the graded serial regeneration is beneficial to improving the regeneration effect; the regeneration temperature of the system is relatively low, so that the waste heat of the regeneration can be utilized, and the regeneration energy consumption is further reduced by combining with a high-temperature heat pump/solar heat collector. Under the condition of meeting the condition of high-efficiency stable production of dry air with dew point temperature as low as-70 ℃, the adsorption pressure and the regeneration temperature of the system are reduced, the operation energy consumption is effectively reduced, meanwhile, the adsorption dehumidification load is reduced by multistage dehumidification and series regeneration, the operation maintenance cost is reduced, and the energy utilization efficiency is further improved by utilizing the waste heat of regenerated exhaust gas and heating of a high-temperature heat pump/solar heat collector during the regeneration of the system.
The conception, specific structure, and technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, features, and effects of the present invention.
Drawings
FIG. 1 is a schematic diagram of the dehumidification regeneration stage of a dry air production system for temperature and pressure swing adsorption in accordance with a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of the working principle of a dehumidification cold blowing stage of a dry air production system of temperature and pressure swing adsorption in accordance with a preferred embodiment of the present invention;
the system comprises a 1-condensation dehumidification subsystem, a 2-air compression subsystem, a 3-pressure swing adsorption subsystem, a 4-inlet filter, a 5-surface cooler, a 6-gas-water separator, a 7-blower, an 8-aftercooler, a 91-first dehumidifier, a 92-second dehumidifier, a 101-first adsorption tower, a 102-second adsorption tower, a 11-outlet filter, a 121-first regenerator, a 122-second regenerator, a 13-electric heater, a 14-regeneration blower, a 15-regeneration hot water tank, a 16-heating device, a 17-cold water unit, a 18-chilled water pump, a 191-first inlet valve, a 192-second inlet valve, a 201-first one-way valve, a 202-second one-way valve, a 203-third one-way valve, a 204-fourth one-way valve, a 205-fifth one-way valve, a 206-sixth one-way valve, a 207-seventh one-way valve, a 208-eighth one-way valve, a 21-product valve, a 22-regeneration depressurization valve, a 23-air valve, a 24-heating valve, a 25-cold air valve, a 26-bypass, a 27-regeneration valve, a 281-fourth one-way valve, a third one-way valve, a 283-third one-way valve, a third air valve and 284.
Detailed Description
The following description of the preferred embodiments of the present invention refers to the accompanying drawings, which make the technical contents thereof more clear and easy to understand. The present invention may be embodied in many different forms of embodiments and the scope of the present invention is not limited to only the embodiments described herein.
In the drawings, like structural elements are referred to by like reference numerals and components having similar structure or function are referred to by like reference numerals. The dimensions and thickness of each component shown in the drawings are arbitrarily shown, and the present invention is not limited to the dimensions and thickness of each component. The thickness of the components is exaggerated in some places in the drawings for clarity of illustration.
As shown in FIG. 1, the temperature and pressure swing adsorption dry air production system and the operation method thereof provided by the invention comprise a condensation dehumidification subsystem 1, an air compression subsystem 2, a pressure swing adsorption subsystem 3, a water chilling unit 17 and related pipelines and valves; the condensation dehumidification subsystem 1 comprises an inlet filter 4, a surface cooler 5 and a gas-water separator 6 which are sequentially connected end to end through an air pipe, and an outlet of the gas-water separator 6 is connected to an inlet of a blower 7; the air compression subsystem 2 comprises a blower 7 and an aftercooler 8 which are sequentially connected end to end through an air pipe, and the outlet of the aftercooler 8 is connected to the inlet of a first inlet air valve 191; the pressure swing adsorption system 3 comprises a first inlet air valve 191, a first dehumidifier 91 and a second dehumidifier 92 which are sequentially connected end to end through an air pipe, wherein a dehumidification outlet of the second dehumidifier 92 is connected with a first port of a first adsorption tower 101 through a first one-way air valve 201, a dehumidification outlet of the second dehumidifier 92 is connected with a first port of a second adsorption tower 102 through a fifth one-way air valve 205, a second port of the first adsorption tower 101 is connected to an inlet of a product air valve 21 through a fourth one-way air valve 204, a second port of the second adsorption tower 102 is connected to an inlet of the product air valve 21 through an eighth one-way air valve 208, and an outlet of the product air valve 21 is connected to an inlet of an outlet filter 11; the inlet of the product air valve 21 is also connected with the inlet of the regeneration reducing valve 22, the regeneration reducing valve 22 is sequentially connected with the inlet of the regeneration blower 14 through the regeneration air valve 23, the first regenerator 121, the second regenerator 122, the electric heater 13 and the heating air valve 24, the regeneration reducing valve 22 is also directly connected with the inlet of the regeneration blower 14 through the cold air valve 25, the outlet of the regeneration blower 14 is connected to the second port of the second adsorption tower 102 through the seventh one-way air valve 207, the first port of the second adsorption tower 102 is connected to the regeneration inlet of the second dehumidifier 92 through the sixth one-way air valve 206, the outlet of the regeneration blower 14 is also connected to the second port of the first adsorption tower 101 through the third one-way air valve 203, and the first port of the first adsorption tower 101 is connected to the regeneration inlet of the second dehumidifier 92 through the second one-way air valve 202. The regeneration outlet of the second dehumidifier 92 is connected to the regeneration inlet of the first dehumidifier 91 after passing through the second regenerator 122, and the regeneration outlet of the first dehumidifier 91 is connected to the external environment after passing through the regeneration exhaust valve 27 and the first regenerator 121 in sequence.
In the pressure swing suction system 3, a path of air pipe is arranged between the inlet of the first inlet air valve 191 and the inlet of the second dehumidifier 92, and a second inlet air valve 192 is arranged on the air pipe; a bypass exhaust valve 26 is provided between the outlet of the second dehumidifier 92 and the second regenerator 122; the opening degree of the two valves can be continuously regulated between 0 and 100 percent, so that the reasonable distribution of the air quantity among different pipelines is realized, and the different dehumidification loads under different working stages or inlet condition changes can be dealt with.
Because the first dehumidifier 91 and the second dehumidifier 92 require a regeneration heat source, the pressure swing adsorption system 3 also comprises a regeneration hot water tank 15 and a heat supply device 16, the heat supply device 16 is a solar heat collector or a high-temperature heat pump, hot water with the temperature of 80-90 ℃ in the regeneration hot water tank 15 is supplied by the heat supply device 16, and compared with the dehumidification of a rotating wheel or a packed bed, the pressure swing adsorption system has the advantages that the energy-saving and environment-friendly effects are obvious because the regeneration hot water with the temperature of more than 120 ℃ is required to be regenerated by high-temperature air; the hot water outlet of the regeneration hot water tank 15 is connected to the regeneration hot water pipe inlet of the second dehumidifier 92, the regeneration hot water pipe outlet of the second dehumidifier 92 is connected to the regeneration hot water pipe inlet of the first dehumidifier 91, and the regeneration hot water pipe outlet of the first dehumidifier 91 is connected to the hot water inlet of the regeneration hot water tank 15.
The first dehumidifier 91 and the second dehumidifier 92 in the pressure swing adsorption system 3 are respectively provided with two air inlets and two air outlets, namely a dehumidification inlet and a regeneration inlet and outlet, and each dehumidifier comprises two dehumidification heat exchanger components with the same specification, so that the dehumidifiers can simultaneously perform dehumidification and regeneration; the dehumidifier is connected with the regenerated hot water tank 15 through a regenerated hot water pipe and connected with the water chiller 17 through a dehumidified cold water pipe; the dehumidifying heat exchanger is made by coating molecular sieve drying agent on the surface of the tube-fin heat exchanger, has high-efficiency heat and mass transfer performance, the drying agent attached to the outside of the tube and the fins has good adsorption capacity to moisture, and chilled water flowing in the copper tube provides cold energy during dehumidification, so that the temperature of the drying agent is prevented from rising and the adsorption capacity is reduced due to adsorption heat generated in the adsorption process, and hot water flowing in the copper tube provides desorption heat as a heat source during regeneration, thereby being beneficial to keeping the regeneration temperature and strengthening the regeneration effect.
In addition, the drying agent in the first adsorption tower 101 and the second adsorption tower 102 in the pressure swing adsorption system 3 is one or a combination of several of active carbon, active alumina, artificial zeolite and 13X molecular sieve, and the adsorption tower is a vertical packed adsorption tower or a vertical radial flow adsorption tower, preferably, the adsorption tower can be matched with a drying agent compressing device to prolong the service life of the drying agent.
The chilled water unit 17 in the system supplies low-temperature chilled water to the surface cooler 5, the aftercooler 8, the first dehumidifier 91 and the second dehumidifier 92 through the chilled water pump 18, the first chilled water valve 281, the second chilled water valve 282, the third chilled water valve 283 and the fourth chilled water valve 284, so that condensation dehumidification, air cooling and two-stage dehumidification cooling functions are respectively realized, and the structure arrangement is compact.
The operation method of the system comprises a dehumidification regeneration stage and a dehumidification cold blowing stage; the switching of different working phases is realized by adjusting the states of the first inlet valve 191, the second inlet valve 192, the first one-way valve 201, the second one-way valve 202, the third one-way valve 203, the fourth one-way valve 204, the fifth one-way valve 205, the sixth one-way valve 206, the seventh one-way valve 207, the eighth one-way valve 208, the cold blow valve 25, the backheating valve 23, the heating valve 24, the bypass exhaust valve 26 and the regeneration exhaust valve 27.
As shown in fig. 1, for the dehumidification regeneration phase: the first inlet valve 191, the first one-way valve 201, the fourth one-way valve 204, the product valve 21, the regeneration pressure reducing valve 22, the regeneration valve 23, the heating valve 24, the sixth one-way valve 206, the seventh one-way valve 207, the regeneration exhaust valve 27 are opened, and the remaining valves are closed. The inlet air firstly enters a condensation dehumidification subsystem 1, is filtered by an inlet filter 4 and is condensed and dehumidified by a surface cooler 5, so that preliminary purification and drying are realized, and the dew point temperature is reduced to be slightly higher than the inlet temperature of chilled water; the air enters the compressed air subsystem 2, is pressurized by the blower 7 and is cooled to the inlet temperature of the blower 7 by the aftercooler 8; then air enters the pressure swing adsorption system 3, flows through the first dehumidifier 91 and the second dehumidifier 92 after flowing through the first inlet air valve 191, is further dehumidified by a dehumidifying heat exchanger in the pressure swing adsorption system, the dew point temperature of the air is reduced to below minus 30 ℃, then the air flows into the first adsorption tower 101 after flowing through the first one-way air valve 201, is deeply dried by a desiccant in the first adsorption tower 101, and the dew point temperature is reduced to minus 70 ℃; after the dry air flows through the fourth one-way air valve 204 after the tower, most of the air flows through the product air valve 21 and the outlet filter 11 to become extremely dry clean product air, while the pressure of the small part of the air is reduced through the regeneration reducing valve 22, and then the air continuously flows through the regenerative air valve 23, the first heat regenerator 121, the second heat regenerator 122 and the electric heater 13 in sequence, the temperature is increased to more than 100 ℃, and the air is introduced into the second adsorption tower 102 through the heating air valve 24 by the regeneration fan 14 to regenerate the second adsorption tower 102 under the conditions of low pressure and high temperature; because the system dehumidifies in multiple stages, the dehumidification load of the adsorption tower is extremely low, the moisture content of the regenerated gas is still extremely low, the temperature is still high, the regenerated gas continuously flows through the second dehumidifier 92, the second regenerator 122, the first dehumidifier 91, the regeneration exhaust valve 27 and the first regenerator 121 in sequence, the regeneration of the dehumidifier and the utilization of the waste heat of the regenerated gas are realized, and then the regenerated gas is discharged to the environment.
After the dehumidification regeneration stage is finished, because the adsorption tower adopts temperature-changing pressure-changing adsorption, the temperature of the drying agent in the regeneration tower is obviously higher than the temperature of the inlet of the dehumidified air, and a small amount of moisture which is not taken away remains in the tower, if the regeneration tower is directly switched into a dehumidification state, the deep dehumidification of the air is not facilitated, and therefore, a small amount of normal-temperature drying product gas is required to be introduced for cold blowing, the temperature of the drying agent is reduced, and the residual moisture is taken away to restore the dehumidification capability of the drying agent.
As shown in fig. 2, for the dehumidification cold blow phase: the first inlet valve 191, the second inlet valve 192, the first one-way valve 201, the fourth one-way valve 204, the product valve 21, the regeneration reducing valve 22, the cold blow valve 25, the sixth one-way valve 206, the seventh one-way valve 207, the bypass exhaust valve 26, the regeneration exhaust valve 27 are opened, and the remaining valves are closed. The inlet air firstly enters a condensation dehumidification subsystem 1, is filtered by an inlet filter 4 and is condensed and dehumidified by a surface cooler 5, so that preliminary purification and drying are realized, and the dew point temperature is reduced to be slightly higher than the inlet temperature of chilled water; the air enters the compressed air subsystem 2, is pressurized by the blower 7 and is cooled to the inlet temperature of the blower 7 by the aftercooler 8; then the air enters the pressure swing adsorption system 3 and is divided into two paths, the opening degrees of a first inlet air valve 191 and a second inlet air valve 192 are adjusted according to the dew point change condition of the product air and the wet load of the system, one part of the air flows through the first inlet air valve 191 and then flows through the first dehumidifier 91, the other part of the air flows through the second inlet air valve 192, the two air flows are converged and then flow through the second dehumidifier 92, the air is further dehumidified by a dehumidification heat exchanger in the second dehumidifier, the dew point temperature of the air is reduced to below minus 30 ℃, then the air flows into the first adsorption tower 101 after passing through the first one-way air valve 201, the air is deeply dried by a desiccant in the first adsorption tower 101, and the dew point temperature is reduced to minus 70 ℃; after the dry air flows through the fourth one-way air valve 204 after the tower, most of the air flows through the product air valve 21 and the outlet filter 11 to become extremely dry clean product air, and a small part of the air flows through the regeneration reducing valve 22 to reduce the pressure, then flows through the cold air blowing valve 25 to enter the regeneration blower 14, and flows into the second adsorption tower 102 to cool and blow the adsorption tower; the moisture content of the cold blowing exhaust gas is lower than that of the regeneration exhaust gas of the adsorption tower in the dehumidification regeneration stage, and the regeneration capacity of the dehumidifier is also stronger, so that the opening degrees of the bypass exhaust valve 26 and the regeneration exhaust valve 27 are regulated, a part of cold blowing gas is discharged to the environment from the bypass exhaust valve 26 after flowing through the second dehumidifier 92 for regeneration, and the rest of cold blowing gas continuously flows through the second regenerator 122, the first dehumidifier 91, the regeneration exhaust valve 27 and the first regenerator 121 and is discharged to the environment after regenerating the first dehumidifier 91, so that the two dehumidifiers achieve different dehumidification/regeneration amounts; note that at this time, although the regeneration gas flows through the first regenerator 121 and the second regenerator 122, the regenerators do not operate because the cold blow gas is not heated during the cold blow stage.
After the two working phases are completed, the adsorption capacity of the first adsorption tower 101 is close to saturation, the second adsorption tower 102 basically recovers the moisture absorption capacity, at the moment, the one-way air valves are switched, the second one-way air valve 202, the third one-way air valve 203, the fifth one-way air valve 205 and the eighth one-way air valve 208 are opened, the first one-way air valve 201, the fourth one-way air valve 204, the sixth one-way air valve 206 and the seventh one-way air valve 207 are closed, so that the first adsorption tower 101 enters a regeneration state and the second adsorption tower 102 enters a dehumidification state, and the system continuously operates in a circulating and reciprocating mode.
The dry air production system based on temperature and pressure swing adsorption and the operation method thereof provided by the invention are based on the temperature and pressure swing adsorption principle, so that the circulating dehumidification amount of the solid desiccant is effectively improved; by combining condensation dehumidification and multistage adsorption, the dehumidification load and the working pressure of the adsorption tower are reduced, compared with the traditional single-stage pressure swing adsorption dehumidification, the operation energy consumption is obviously reduced, the service life of the adsorbent is prolonged, and the maintenance cost is reduced; meanwhile, the system combines renewable energy source utilization and waste heat recovery, so that the energy utilization rate is further improved, and the work is efficient and stable.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention without requiring creative effort by one of ordinary skill in the art. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (10)
1. The utility model provides a temperature swing adsorption's dry air production system, a serial communication port, including condensation dehumidification subsystem, air compression subsystem and pressure swing adsorption subsystem, wherein, condensation dehumidification subsystem includes through the tuber pipe end to end's import filter, surface cooler and air-water separator in proper order, the air compression subsystem includes through tuber pipe end to end's air-blower and after-cooler in proper order, pressure swing adsorption subsystem includes first dehumidifier, second dehumidifier, first adsorption tower, second adsorption tower and regeneration fan, after-cooler passes through first import pneumatic valve and the dehumidification import of first dehumidifier links to each other, the dehumidification export of first dehumidifier with the dehumidification import of second dehumidifier links to each other, the dehumidification export of second dehumidifier passes through first check pneumatic valve and the first port of first adsorption tower links to each other, the dehumidification export of second dehumidifier passes through the fifth check pneumatic valve and the first port of second adsorption tower links to each other, the second port of first adsorption tower passes through the fourth check pneumatic valve and is connected to the first adsorption tower, second port of second adsorption tower passes through the second one-way pneumatic valve and the regeneration fan is connected to the second inlet of second one-way pneumatic valve, the regeneration fan is connected to the second air-valve through the second port of second adsorption tower, the regeneration fan is connected to the second port through the second pneumatic valve and the regeneration air valve is connected to the regeneration air valve in proper order, the regeneration air valve is connected to the second one-way pneumatic valve through the second port of the regeneration tower is connected to the second port through the second pneumatic valve, the outlet of the regeneration fan is also connected to the second port of the first adsorption tower through a third one-way air valve, the first port of the first adsorption tower is connected to the regeneration inlet of the second dehumidifier through a second one-way air valve, the regeneration outlet of the second dehumidifier is connected to the regeneration inlet of the first dehumidifier after passing through the second heat regenerator, and the regeneration outlet of the first dehumidifier is connected with the external environment after passing through the regeneration exhaust valve and the first heat regenerator in sequence.
2. The temperature and pressure swing adsorption dry air production system of claim 1, wherein the outlet of the product air valve is connected to the inlet of the outlet filter, a duct is further provided between the inlet of the first inlet air valve and the dehumidification inlet of the second dehumidifier, a second inlet air valve is provided on the duct, and a bypass exhaust valve is further provided between the regeneration outlet of the second dehumidifier and the second regenerator.
3. The temperature and pressure swing adsorption dry air production system of claim 1, wherein the pressure swing adsorption system further comprises a regeneration hot water tank, a hot water outlet of the regeneration hot water tank being connected to a regeneration hot water pipe inlet of the second dehumidifier, a regeneration hot water pipe outlet of the second dehumidifier being connected to a regeneration hot water pipe inlet of the first dehumidifier, a regeneration hot water pipe outlet of the first dehumidifier being connected to a hot water inlet of the regeneration hot water tank.
4. A temperature and pressure swing adsorption dry air production system according to claim 3 wherein said pressure swing adsorption system further comprises a heating means connected to said regenerated hot water tank, said heating means being a solar collector or a high temperature heat pump.
5. The temperature and pressure swing adsorption dry air production system of claim 1 wherein the first dehumidifier and the second dehumidifier each comprise two desiccant heat exchangers, wherein the desiccant heat exchangers are formed by coating molecular sieve desiccant on the surfaces of tube-fin heat exchangers.
6. The temperature and pressure swing adsorption dry air production system of claim 1, further comprising a chiller that supplies water to the surface chiller, the aftercooler, the first dehumidifier, and the second dehumidifier via chilled water pumps.
7. The temperature and pressure swing adsorption dry air production system of claim 1 wherein the desiccant in the first and second adsorption columns is one or a combination of several of activated carbon, activated alumina, synthetic zeolite, and 13X molecular sieve.
8. A method of operating a temperature and pressure swing adsorption dry air production system for a dry air production system according to any one of claims 1 to 7, wherein the method of operating comprises a dehumidification regeneration mode in which a first inlet air valve, a first one-way air valve, a fourth one-way air valve, a product air valve, a regeneration pressure reducing valve, a regeneration air valve, a heating air valve, a sixth one-way air valve, a seventh one-way air valve, a regeneration air valve are in an open state; the second inlet air valve, the second one-way air valve, the third one-way air valve, the fifth one-way air valve, the eighth one-way air valve, the cold air valve and the bypass air valve are in a closed state.
9. The method of operating a temperature and pressure swing adsorption dry air production system of claim 8, further comprising a dehumidification cold blow mode in which the first inlet air valve, the second inlet air valve, the first one-way air valve, the fourth one-way air valve, the product air valve, the regeneration pressure relief valve, the cold blow air valve, the sixth one-way air valve, the seventh one-way air valve, the bypass air valve, the regeneration air valve are in an open state; the second one-way air valve, the third one-way air valve, the fifth one-way air valve, the eighth one-way air valve, the backheating air valve and the heating air valve are in a closed state.
10. The method of claim 9, wherein after passing through the dehumidification regeneration mode and the dehumidification cold blowing mode, the second one-way air valve, the third one-way air valve, the fifth one-way air valve and the eighth one-way air valve are opened, and the first one-way air valve, the fourth one-way air valve, the sixth one-way air valve and the seventh one-way air valve are closed, so that the first adsorption tower enters a regeneration state and the second adsorption tower enters a dehumidification state, and continuous operation of the system is realized.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116712742A (en) * | 2023-08-11 | 2023-09-08 | 黑龙江飞鹤乳业有限公司 | Industrial open type spray multistage drying system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116712742A (en) * | 2023-08-11 | 2023-09-08 | 黑龙江飞鹤乳业有限公司 | Industrial open type spray multistage drying system |
| CN116712742B (en) * | 2023-08-11 | 2024-02-02 | 黑龙江飞鹤乳业有限公司 | Industrial open type spray multistage drying system |
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