CN110465164B - Device and method for preparing ultralow dew point dry air based on low-pressure adsorption - Google Patents
Device and method for preparing ultralow dew point dry air based on low-pressure adsorption Download PDFInfo
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- CN110465164B CN110465164B CN201910671935.5A CN201910671935A CN110465164B CN 110465164 B CN110465164 B CN 110465164B CN 201910671935 A CN201910671935 A CN 201910671935A CN 110465164 B CN110465164 B CN 110465164B
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Abstract
A low-pressure adsorption-based ultralow dew point dry air preparation device and method are characterized in that a freezing and rotating wheel dehumidification subsystem, a compressed air subsystem, a low-pressure adsorption dehumidification subsystem and a water chilling unit which form a loop are sequentially connected, wherein: the processed air is sequentially subjected to freezing and dehumidification by the freezing and rotating wheel dehumidification subsystem, the dew point temperature is reduced to the temperature of freezing water generated by the water chilling unit, then normal pressure adsorption dehumidification is carried out by the freezing and rotating wheel dehumidification subsystem, pressure lifting and temperature reduction are carried out by the compressed air subsystem, and the processed air enters the low pressure adsorption dehumidification subsystem for low pressure adsorption dehumidification after the temperature is reduced by cooling water heat exchange and freezing water heat exchange, and finally deep drying is achieved. The device and the method for preparing the ultralow dew point dry air by using the low pressure adsorption principle are used for preparing the ultralow dew point dry air, and simultaneously, the energy consumption is reduced compared with the traditional method for preparing the ultralow dew point air by using high pressure adsorption.
Description
Technical Field
The invention relates to a technology in the field of air dehumidification, in particular to a device and a method for preparing ultralow dew point dry air based on low-pressure adsorption.
Background
In the manufacturing or experiment process in the fields of batteries, pharmacy, chemical industry, military industry and the like, extremely high requirements are placed on the air humidity of a workshop, a pipeline, a laboratory and the like, deep drying is required in many cases, and the air in the space is dried air with an ultralow dew point. The most common methods of air dehumidification at present include freeze dehumidification, adsorption dehumidification and high pressure adsorption.
Freezing dehumidification, namely, the temperature of the treated air is reduced to be lower than the dew point temperature, and liquid water is condensed. When deep dehumidification is needed, deep cooling needs to be carried out on the air to be treated, the dew point of the air is reduced to be lower, but the technical operation requirements are high, the working condition is severe, or liquid nitrogen is adopted for cooling to realize deep drying, so that the energy consumption is high, and the cost is high. The adsorption dehumidification adopts a dehumidification rotating wheel and other normal pressure adsorption methods for dehumidification, but the air dew point is difficult to be reduced continuously, and the rotating wheel has high regeneration temperature and high energy consumption. High-pressure adsorption, that is, referring to the principle of high-pressure adsorption and air separation in the air separation industry, an adsorption tower is used to adsorb moisture in air under high pressure by using an adsorbent to achieve drying, but the pressure required by such technology is very high, usually the adsorption pressure is over 0.2MPa (gauge pressure), and the energy consumption required by drying is greatly increased due to the use of an air compressor.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a device and a method for preparing ultralow dew point dry air based on low-pressure adsorption, and the device and the method for preparing ultralow dew point dry air by using a low-pressure adsorption principle are used for preparing ultralow dew point dry air, and simultaneously, compared with the traditional method for preparing ultralow dew point air by using high-pressure adsorption, the energy consumption is reduced.
The invention is realized by the following technical scheme:
the invention relates to an ultralow dew point dry air preparation device based on low pressure adsorption, which comprises: freezing and runner dehumidification subsystem, compressed air subsystem, low pressure adsorption dehumidification subsystem and the cooling water set that links to each other in proper order and constitute the loop, wherein: the processed air is sequentially subjected to freezing and dehumidification by the freezing and rotating wheel dehumidification subsystem, the dew point temperature is reduced to the temperature of freezing water generated by the water chilling unit, then normal pressure adsorption dehumidification is carried out by the freezing and rotating wheel dehumidification subsystem, pressure lifting and temperature reduction are carried out by the compressed air subsystem, and the processed air enters the low pressure adsorption dehumidification subsystem for low pressure adsorption dehumidification after the temperature is reduced by cooling water heat exchange and freezing water heat exchange, and finally deep drying is achieved.
The invention relates to a preparation method of ultralow dew point dry air based on low pressure adsorption of the device, which comprises the following steps: dry regeneration operating mode and dry cold blowing operating mode, wherein:
under the dry regeneration working condition, the flowing direction of air is as follows: the inlet air enters the freezing and rotating wheel dehumidification subsystem, passes through the surface cooler and the rotating wheel dehumidification device, enters the compressed air subsystem, passes through the high-pressure fan, the heat regenerator, the cooling water heat exchanger and the chilled water heat exchanger, enters the low-pressure adsorption dehumidification subsystem, passes through the first air valve or the second air valve, the first adsorption tower or the second adsorption tower, and the seventh air valve or the eighth air valve, is divided into two paths, and one path of air passes through the finished air valve to become ultra-low dew point dry air; and the other path of the gas passes through a regeneration gas valve, a first heat recovery valve, a heat regenerator, a second heat recovery valve, a heater, a sixth air valve or a fifth air valve, a second adsorption tower or a first adsorption tower, a fourth air valve or a third air valve, a rotating wheel regeneration gas valve and a rotating wheel dehumidification device and then is discharged out of the system. The flow direction of the chilled water is as follows: the chilled water generated by the water chilling unit can be divided into two paths, wherein one path of the chilled water can enter the surface cooler through the surface cooler valve and then returns to the water chilling unit; the other path of the refrigerant can enter the chilled water heat exchanger through the chilled water heat exchanger valve and then returns to the water chilling unit. The flow direction of the cooling water is as follows: cooling water supply can be divided into two paths, wherein one path can enter a water chilling unit and then flows back to cooling water return water; the other path of the cooling water can pass through a cooling water heat exchanger valve and then enters a cooling water heat exchanger and then returns to the cooling water backwater.
Under the dry cold blowing working condition, the air flow direction is as follows: the inlet air enters the freezing and rotating wheel dehumidification subsystem, passes through the surface cooler and the rotating wheel dehumidification device, enters the compressed air subsystem, passes through the high-pressure fan, the heat regenerator, the cooling water heat exchanger and the chilled water heat exchanger, enters the low-pressure adsorption dehumidification subsystem, passes through the first air valve or the second air valve, the first adsorption tower or the second adsorption tower, and the seventh air valve or the eighth air valve, is divided into two paths, and one path of air passes through the finished air valve to become ultra-low dew point dry air; and the other path of the gas passes through a regeneration gas valve, a cold blowing valve, a sixth air valve or a fifth air valve, a second adsorption tower or a first adsorption tower, a fourth air valve or a third air valve, a first bypass valve, a heat regenerator, a second bypass valve and a rotary wheel dehumidification device and then is discharged out of the system. The flow direction of the chilled water is as follows: the chilled water generated by the water chilling unit can be divided into two paths, wherein one path of the chilled water can enter the surface cooler through the surface cooler valve and then returns to the water chilling unit; the other path of the refrigerant can enter the chilled water heat exchanger through the chilled water heat exchanger valve and then returns to the water chilling unit. The flow direction of the cooling water is as follows: cooling water supply can be divided into two paths, wherein one path can enter a water chilling unit and then flows back to cooling water return water; the other path of the cooling water can pass through a cooling water heat exchanger valve and then enters a cooling water heat exchanger and then returns to the cooling water backwater.
Technical effects
Compared with the prior art, the invention has the technical effects that:
1) the drying process route is optimized, the freezing and rotating wheel dehumidification subsystem and the low-pressure adsorption dehumidification subsystem are reasonably configured, and the freezing dehumidification, normal-pressure adsorption dehumidification and low-pressure adsorption dehumidification process routes are optimally combined, so that the processed air can be deeply dried under lower adsorption pressure, the pressure increase of a high-pressure fan is reduced, and the energy consumption of the high-pressure fan is reduced.
2) A heat regenerator is arranged behind the high-pressure fan, and the waste heat generated when the high-pressure fan raises the pressure of the processed air is utilized to preheat the regenerated gas, so that the energy consumption of the heater is reduced.
3) The regeneration gas used by the rotary wheel dehumidification device comes from the gas regenerated by the adsorption tower. Since the adsorption tower performs only deep drying, the amount of moisture adsorbed by the adsorbent in the adsorption tower is small, and the regenerated gas is still very dry. The relatively dry gas is used for regenerating the rotary wheel dehumidification device, so that the high-efficiency energy-saving regeneration of the rotary wheel dehumidification device is realized, and the aim of further saving energy of the whole device is fulfilled.
Drawings
FIG. 1 is a schematic diagram of a dry regeneration operation of the present invention;
FIG. 2 is a schematic diagram of a drying and cold blowing operation according to the present invention;
the system comprises a refrigeration and rotary wheel dehumidification subsystem 1, a compressed air subsystem 2, a low-pressure adsorption dehumidification subsystem 3, a surface air cooler 4, a rotary wheel dehumidification device 5, a high-pressure fan 6, a heat regenerator 7, a cooling water heat exchanger 8, a chilled water heat exchanger 9, a first air valve 10, a second air valve 11, a third air valve 12, a fourth air valve 13, a fifth air valve 14, a sixth air valve 15, a seventh air valve 16, an eighth air valve 17, a first adsorption tower 18, a second adsorption tower 19, a finished air valve 20, a regeneration air valve 21, a cold blowing valve 22, a first heat recovery valve 23, a second heat recovery valve 24, a heater 25, a second bypass valve 26, a first bypass valve 27, a regenerative rotary wheel air valve 28, a cooling water heat exchanger valve 29, a chilled water heat exchanger valve 30, a surface air cooler valve 31 and a cold water unit 32.
Detailed Description
The ultralow dew point dry air preparation facilities based on low pressure absorption that this embodiment relates to includes: freezing and runner dehumidification subsystem 1, compressed air subsystem 2, low pressure adsorption dehumidification subsystem 3 and the cooling water set 32 that link to each other in proper order and constitute the loop, wherein: the system comprises a refrigeration and rotary wheel dehumidification subsystem 1, a compressed air subsystem 2, a low-pressure adsorption dehumidification subsystem 3, a refrigeration and rotary wheel dehumidification subsystem 2, a compressed air subsystem 2, a low-pressure adsorption dehumidification subsystem 3, a compressed air subsystem 2 and a water chilling unit 32, wherein the refrigeration and rotary wheel dehumidification subsystems 1 and 2 are respectively communicated with each other, and the compressed air subsystem and the low-pressure adsorption dehumidification subsystem are respectively communicated with each other.
The freezing and rotary wheel dehumidification subsystem 1 comprises: set up in the surface cooler 4 of input, runner dehydrating unit 5 that links to each other with it and set up in the surface cooler valve 31 of the input of surface cooler 4, wherein: the surface cooler valves 31 are connected to the compressed air subsystem 2 and the chiller 32, respectively.
The compressed air subsystem 2 comprises: high pressure positive blower 6, regenerator 7, cooling water heat exchanger 8, the refrigerated water heat exchanger 9 that links to each other in proper order, wherein: the input and output ends of the heat regenerator 7 are respectively provided with a first heat-recovery valve 23 and a second heat-recovery valve 24 which are connected with the low-pressure adsorption dehumidification subsystem 3, and the input ends of the cooling water heat exchanger 8 and the chilled water heat exchanger 9 are respectively provided with a cooling water heat exchanger valve 29 and a chilled water heat exchanger valve 30 which are connected with the refrigeration and rotary dehumidification subsystem 1.
The low-pressure adsorption dehumidification subsystem 3 comprises: the first blast gate 10, first adsorption tower 18, seventh blast gate 16, the finished product pneumatic valve 20 that is used for exporting the finished product gas that constitute finished product gas output branch and the heater 25, sixth blast gate 15, second adsorption tower 19, the fourth blast gate 13 that constitute regeneration gas recovery branch that link to each other in proper order, wherein: the input end of the finished gas output branch is connected with the chilled water heat exchanger 9 of the compressed air subsystem 2, the output end of the finished gas output branch outputs the finished gas or is connected with the input end of the regenerated gas recovery branch, the input end of the regenerated gas recovery branch is connected with the heat regenerator 7 of the compressed air subsystem 2 or is connected with the output end of the finished gas output branch, and the output end of the regenerated gas recovery branch is connected with the freezing and rotating wheel dehumidification subsystem 1 or is connected with the heat regenerator 7 of the compressed air subsystem 2.
The input end and the output end of the first adsorption tower 18 and the second adsorption tower 19 are simultaneously provided with a second air valve 11, a third air valve 12, a fifth air valve 14 and/or an eighth air valve 17 to realize selective parallel connection.
And a second bypass valve 26 is arranged between the input end of the heat regenerator 7 and the input end of the regeneration gas recovery branch of the rotary wheel dehumidification device 5.
A first bypass valve 27 is arranged between the output end of the second adsorption tower 19 and the output end of the heat regenerator 7.
And a rotary wheel regeneration air valve 28 is arranged between the output end of the second adsorption tower 19 and the input end of the rotary wheel dehumidification device 5.
The product gas output branch is connected with the heat regenerator 7 through a regeneration gas valve 21 while outputting the product gas through a product gas valve 20, and a cold blow valve 22 is arranged between the regeneration gas valve 21 and the sixth air valve 15 (or the fifth air valve 14), so that the first heat recovery valve 23, the heat regenerator 7, the second heat recovery valve 24 and the heater 25 are selectively short-circuited, and the regenerated gas can selectively enter or not enter the heat regenerator 7.
The first adsorption tower 18 and the second adsorption tower 19 are filled with a proper amount of adsorbent (such as molecular sieve).
The device works in the following way:
as shown in fig. 1, for dry regeneration conditions:
step 1) opening a surface cooler valve 31, wherein chilled water with a certain temperature generated by a water chilling unit 32 flows into a surface cooler 4 through the surface cooler valve 31 to exchange heat with air to be treated and then flows back to the water chilling unit 32 or flows into a chilled water heat exchanger 9 through a chilled water heat exchanger valve 30 to exchange heat with the air to be treated and then flows back to the water chilling unit 32; the heat generated by the chiller 32 during operation is carried away by the cooling water supply entering the chiller 32 and flowing back to the cooling water return.
Step 2) opening a cooling water heat exchanger valve 29 and a chilled water heat exchanger valve 30, opening a first air valve 10, a seventh air valve 16 and a finished product air valve 20, closing a second air valve 11 and an eighth air valve 17, reducing the dew point of the processed air to the temperature of chilled water after the processed air is subjected to freezing and dehumidification by a surface air cooler 4, reducing the dew point to-30 ℃ to-40 ℃ after the processed air sequentially passes through a rotary wheel dehumidification device 5, increasing the pressure by a high-pressure fan 6, performing heat exchange with regenerated gas with lower temperature by a heat regenerator 7, reducing the temperature, further reducing the temperature after passing through a cooling water heat exchanger 8 and a chilled water heat exchanger 9, entering a first adsorption tower 18 through the first air valve 10, performing low-pressure adsorption and dehumidification by an adsorbent, simultaneously reducing the dew point to-65 ℃ below, and forming deep-dried ultralow dew point air after passing through the seventh air valve 16 and the finished product air valve 20 to obtain finished product air.
The pressure of the elevated pressure is lower than the adsorption pressure of the existing high-pressure adsorption dehumidification.
Step 3) opening a regeneration air valve 21, a first heat recovery valve 23, a second heat recovery valve 24, a sixth air valve 15, a fourth air valve 13 and a rotary wheel regeneration air valve 28, closing a third air valve 12, a fifth air valve 14, a cold blow valve 22, a second bypass valve 26 and a first bypass valve 27, taking the other part of the ultralow dew point air passing through the seventh air valve 16 as regeneration air to pass through the regeneration air valve 21, enabling the first heat recovery valve 23 to enter a heat regenerator 7, exchanging heat with high-temperature processed air at the outlet of a high-pressure fan 6, and then increasing the temperature, wherein the temperature is used as a preheating stage of the regeneration air, so that the heating quantity required by a subsequent heater 25 can be reduced, and the purpose of energy conservation is achieved; the regenerated gas passes through a second heat recovery valve 24 and a heater 25 and then is heated to the required temperature, and then enters a second adsorption tower 19 through a sixth air valve 15, so that the adsorbent in the second adsorption tower is heated and regenerated, and the moisture adsorbed before the adsorbent is released to restore the water absorption capacity; because the low-pressure adsorption dehumidification subsystem 3 only plays a role of deep dehumidification, and most of moisture in the treated air is reduced by the refrigeration and rotary wheel dehumidification subsystem 1, the regenerated gas is still very dry after being heated and regenerated by the second adsorption tower 19 to the adsorbent therein, usually, the dew point is still lower than 0 ℃, and only the temperature is reduced; after that, the regenerated gas passes through the fourth air valve 13 and the rotary wheel regeneration air valve 28 and enters the rotary wheel dehumidification device 5 to be heated and regenerated, and then becomes regenerated waste gas to be discharged out of the whole device.
As shown in fig. 2, the dry and cold blowing conditions are as follows: due to the requirement of the self regeneration characteristic of the adsorbent (such as a molecular sieve), after the adsorbent (such as the molecular sieve) is heated and regenerated, a cold blowing process is still needed, namely, the adsorbent (such as the molecular sieve) which flows into the adsorption tower by using normal-temperature unheated deep drying gas carries away heat left during heating and regeneration and moisture which is not carried away in time.
Step a) is the same as step 1) in the dry regeneration condition;
step b) is the same as step 2) in the dry regeneration working condition;
and step c) opening the regeneration air valve 21, the cold blowing valve 22, the sixth air valve 15, the fourth air valve 13, the first bypass valve 27 and the second bypass valve 26, closing the third air valve 12, the fifth air valve 14, the first heat return valve 23, the second heat return valve 24, the rotating wheel regeneration air valve 28 and the heater 25, and allowing the other part of the regenerated air of the treated air passing through the seventh air valve 16 to pass through the regeneration air valve 21, the cold blowing valve 22 and the sixth air valve 15 and enter the second adsorption tower 19 to perform cold blowing on the adsorbent therein, so as to take away heat left during heating regeneration and moisture which is not taken away in time. Then enters the heat regenerator 7 through the fourth air valve 13 and the first bypass valve 27, exchanges heat with the high-temperature processed air at the outlet of the high-pressure fan 6, and then the temperature rises, and the temperature rise is used as a preheating stage of the regeneration gas of the rotating wheel dehumidification device 5, so that the heating quantity required by the subsequent rotating wheel dehumidification device 5 can be reduced, and the purpose of energy conservation is achieved. After that, the waste gas enters the rotary wheel dehumidification device 5 through the second bypass valve 26 to be heated and regenerated, and then the waste gas becomes regeneration waste gas to be discharged out of the whole device.
The device optimizes the process route of deep drying, utilizes the reasonable configuration of the refrigeration and rotary wheel dehumidification subsystem and the low-pressure adsorption dehumidification subsystem, optimizes and combines the refrigeration dehumidification, normal-pressure adsorption dehumidification and low-pressure adsorption dehumidification process routes, enables the treated air to reach deep drying under lower adsorption pressure, reduces the pressure lifting of the high-pressure fan, and reduces the energy consumption of the high-pressure fan.
A heat regenerator is arranged behind the high-pressure fan, and the waste heat generated when the high-pressure fan raises the pressure of the processed air is utilized to preheat the regenerated gas, so that the energy consumption of the heater is reduced.
The regeneration gas used by the rotary wheel dehumidification device comes from the gas regenerated by the adsorption tower. Since the adsorption tower performs only deep drying, the amount of moisture adsorbed by the adsorbent in the adsorption tower is small, and the regenerated gas is still very dry. The relatively dry gas is used for regenerating the rotary wheel dehumidification device, so that the high-efficiency energy-saving regeneration of the rotary wheel dehumidification device is realized, and the aim of further saving energy of the whole device is fulfilled.
According to experimental and theoretical calculation and analysis, under the working condition of a conventional environment and under the adsorption pressure of 0.1-0.6MPa (absolute pressure), the process route of combining the optimized normal-pressure adsorption equipment and the adsorption tower can generate dry air with the dew point of-65 ℃, and the operation power of the process route is lower than that of the process route of singly adopting the adsorption tower as an adsorption device, and is averagely lower than 22-28%. And the operating power of the high-pressure fan for providing the pressure required by the system is a main energy consumption source of the system, so that the operating power of the system is linearly increased along with the increase of the operating pressure, which shows that the graded dehumidification process route provided by the invention is an effective system energy-saving method.
The foregoing embodiments may be modified in many different ways by those skilled in the art without departing from the spirit and scope of the invention, which is defined by the appended claims and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (2)
1. An ultralow dew point dry air preparation device based on low pressure adsorption is characterized by comprising: freezing and runner dehumidification subsystem, compressed air subsystem, low pressure adsorption dehumidification subsystem and the cooling water set that links to each other in proper order and constitute the loop, wherein:
the air to be treated is sequentially subjected to freezing and dehumidification by the freezing and rotating wheel dehumidification subsystem, the dew point temperature is reduced to the temperature of freezing water generated by a water chilling unit, then normal-pressure adsorption dehumidification is carried out by the freezing and rotating wheel dehumidification subsystem, pressure rise and temperature reduction are carried out by the compressed air subsystem, the air to be treated enters the low-pressure adsorption dehumidification subsystem for low-pressure adsorption dehumidification after the temperature of the air to be treated is reduced by cooling water heat exchange and freezing water heat exchange, and finally deep drying is achieved;
the low-pressure adsorption dehumidification subsystem comprises: the first blast gate, first adsorption tower, seventh blast gate that constitute finished product gas output branch road link to each other in proper order, be used for outputting the finished product pneumatic valve of finished product gas and link to each other in proper order and constitute heater, sixth blast gate, second adsorption tower, the fourth blast gate of regeneration gas recovery branch road, wherein: the input end of the finished gas output branch is connected with the chilled water heat exchanger of the compressed air subsystem, the output end of the finished gas output branch outputs the finished gas or is connected with the input end of the regenerated gas recovery branch, the input end of the regenerated gas recovery branch is connected with the heat regenerator of the compressed air subsystem or is connected with the output end of the finished gas output branch, and the output end of the regenerated gas recovery branch is connected with the freezing and rotating wheel dehumidification subsystem or is connected with the heat regenerator of the compressed air subsystem;
the freezing and rotary wheel dehumidification subsystem comprises: set up in the surface cooler of input, the runner dehydrating unit who links to each other with it and set up in the surface cooler valve of the input of surface cooler, wherein: the surface cooler valve is respectively connected with the compressed air subsystem and the water chilling unit;
the compressed air subsystem includes: high pressure positive blower, regenerator, cooling water heat exchanger, the refrigerated water heat exchanger that links to each other in proper order, wherein: the input end and the output end of the heat regenerator are respectively provided with a first heat recovery valve and a second heat recovery valve which are connected with the low-pressure adsorption dehumidification subsystem, and the input ends of the cooling water heat exchanger and the chilled water heat exchanger are respectively provided with a cooling water heat exchanger valve and a chilled water heat exchanger valve which are connected with the refrigeration and rotary wheel dehumidification subsystem;
the input end and the output end of the first adsorption tower and the second adsorption tower are simultaneously provided with a second air valve, a third air valve, a fifth air valve and/or an eighth air valve so as to realize selective parallel connection;
a second bypass valve is arranged between the input end of the heat regenerator and the input end of the regenerated gas recovery branch of the rotary wheel dehumidification device;
a first bypass valve is arranged between the output end of the second adsorption tower and the output end of the heat regenerator; a rotary wheel regeneration air valve is arranged between the output end of the second adsorption tower and the input end of the rotary wheel dehumidification device;
the finished gas output branch is connected with the heat regenerator through a regeneration gas valve while outputting the finished gas through a finished gas valve;
and a cold blow valve is arranged between the regeneration air valve and the sixth air valve or the fifth air valve, so that the first heat recovery valve, the heat regenerator, the second heat recovery valve and the heater are selectively short-circuited, and the regeneration air can selectively enter or not enter the heat regenerator.
2. A low pressure adsorption based ultra low dew point dry air production process based on the apparatus of claim 1, comprising: dry regeneration operating mode and dry cold blowing operating mode, wherein:
under the dry regeneration working condition, inlet air enters the freezing and rotating wheel dehumidification subsystem, enters the compressed air subsystem after passing through the surface air cooler and the rotating wheel dehumidification device, passes through the high-pressure fan, the heat regenerator, the cooling water heat exchanger and the freezing water heat exchanger, enters the low-pressure adsorption dehumidification subsystem, passes through the first air valve or the second air valve, the first adsorption tower or the second adsorption tower, and the seventh air valve or the eighth air valve, and is divided into two paths, wherein one path of air becomes ultra-low dew point dry air after passing through the finished air valve; another way is through regeneration pneumatic valve, first reheat valve, the regenerator, second reheat valve, heater, sixth blast gate or fifth blast gate, second adsorption tower or first adsorption tower, fourth blast gate or third blast gate, runner regeneration pneumatic valve, discharge system behind the runner dehydrating unit, the flow direction of refrigerated water is: the chilled water generated by the water chilling unit can be divided into two paths, wherein one path of the chilled water can enter the surface cooler through the surface cooler valve and then returns to the water chilling unit; the other path can return to the water chilling unit after entering the chilled water heat exchanger through the chilled water heat exchanger valve, and the flow direction of the cooling water is as follows: cooling water supply can be divided into two paths, wherein one path can enter a water chilling unit and then flows back to cooling water return water; the other path can pass through a cooling water heat exchanger valve and then enters a cooling water heat exchanger and then returns to cooling water backwater;
under the dry and cold blowing working condition, inlet air enters the freezing and rotating wheel dehumidification subsystem, enters the compressed air subsystem after passing through the surface air cooler and the rotating wheel dehumidification device, passes through the high-pressure fan, the heat regenerator, the cooling water heat exchanger and the freezing water heat exchanger, enters the low-pressure adsorption dehumidification subsystem, passes through the first air valve or the second air valve, the first adsorption tower or the second adsorption tower, and the seventh air valve or the eighth air valve, and is divided into two paths, wherein one path of air passes through the finished air valve to become dew point ultra-low dry air; another way is through regeneration pneumatic valve, cold blow valve, sixth blast gate or fifth blast gate, second adsorption tower or first adsorption tower, fourth blast gate or third blast gate, first by-pass valve, the regenerator, the second by-pass valve, discharge system behind the runner dehydrating unit, the flow direction of refrigerated water is: the chilled water generated by the water chilling unit can be divided into two paths, wherein one path of the chilled water can enter the surface cooler through the surface cooler valve and then returns to the water chilling unit; the other path can return to the water chilling unit after entering the chilled water heat exchanger through the chilled water heat exchanger valve, and the flow direction of the cooling water is as follows: cooling water supply can be divided into two paths, wherein one path can enter a water chilling unit and then flows back to cooling water return water; the other path of the cooling water can pass through a cooling water heat exchanger valve and then enters a cooling water heat exchanger and then returns to the cooling water backwater.
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