A device and method for rapidly creating an extremely low dew point air environment

Abstract

The application discloses a device and method for quickly creating an extremely low dew point air environment. The device is mainly composed of a vacuum air pump, a blower, an air component mixing box, a stop valve, a photoacoustic spectrum multi-gas analyzer, a PID controller, a water vapor adding device, and pipelines, circuits and valves connecting the above devices. The application is characterized in that the vacuum pump is used to pre-extract vacuum, then nitrogen and oxygen are filled according to the required proportion of air components, the blower is turned on, and after the water vapor content in the gas analyzer is displayed, the PID controller controls the water vapor adding device to add water vapor to the air component mixing box to create the required environment. Compared with the prior art method, the application can successfully create the required environment without complex dehumidification technology, and effectively reduces the cost of creating an extremely low humidity environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of deep dehumidification and artificial environment creation, in particular to a device and method for rapidly creating an extremely low dew point air environment. BACKGROUND

[0002] For some occasions requiring an extremely dry air environment, the water vapor in the environment generally needs to be eliminated through dehumidification technology until the required parameters are reached. At present, there are methods such as refrigeration dehumidification, rotary dehumidification, and solution dehumidification. However, only under pressurized conditions can the dew point of the air to be treated be reduced to about -20℃ by solution dehumidification and refrigeration dehumidification, and the dew point of the air outlet of a lithium chloride rotary dehumidifier is only about -40℃. To reduce the dew point of the air outlet to below -40℃, silica gel and molecular sieve rotary dehumidification means need to be used. This dehumidification method requires a large amount of regeneration heat, and a single device can handle a small amount of dry air. Therefore, for some application occasions requiring an extremely low dew point environment, it is difficult to achieve a dew point temperature below -40℃ by using the direct dehumidification method, and the dehumidification time is long, the cost is high, and it is difficult to meet the application occasions with large air demand. SUMMARY

[0003] The main purpose of the present application is to provide a device and method for rapidly creating an extremely low dew point air environment, aiming to solve the problem that in the prior art, when creating an extremely dry environment, the water vapor concentration cannot be processed to the required concentration, i.e., the dew point temperature cannot be adjusted to an extremely low dew point temperature. For example, the required concentration of water vapor in the created environment is 2ppm, and the required concentration of carbon dioxide is 10ppm. The existing dehumidification equipment and carbon dioxide removal equipment cannot achieve the above level. To achieve the above purpose, the present application provides the following technical solutions:

[0004] The device for rapidly creating an extremely low dew point air environment comprises an air component mixing tank, an air stirrer, a water vapor adding device, a vacuum air pump, a gas analyzer, a PID controller, a blower, an environment creation room, the vacuum air pump is used for vacuumizing before environment creation, the PID controller controls the water vapor adding amount of the water vapor adding device, the gas analyzer is used for measuring the concentration of each gas component in the device, the blower is used for smoothly circulating the air in the entire device, the air component mixing tank is used for mixing air components, and the environment creation room is used for creating a required environment.

[0005] Preferably, the gas analyzer is arranged at the air outlet of the environment creation room and is used for detecting the water vapor concentration in the environment creation room.

[0006] Preferably, the PID controller is used to receive the concentration data measured by the gas analyzer and compare with the initial set concentration value, and then adjust the opening degree of the automatic water vapor nozzle and the automatic carbon dioxide nozzle.

[0007] Preferably, the water vapor adding device is used to add water vapor into the air component mixing tank.

[0008] Preferably, the air component mixing tank is used to mix the air components, and the mixed artificial air is sent into the environment creating room through the air duct.

[0009] In another aspect, the main purpose of the present application is to provide a device and method for quickly creating an extremely low dew point air environment, comprising:

[0010] Step 1: First, use the vacuum air pump to completely extract the air in the device.

[0011] Step 2: Fill the air component mixing tank with air-proportional nitrogen and oxygen.

[0012] Step 3: Turn on the fan to mix the oxygen and nitrogen thoroughly.

[0013] Step 4: Turn on the air blower, and the gas analyzer is arranged at the air outlet of the environment creating room to detect the water vapor concentration flowing out of the environment creating room.

[0014] Step 5: The PID controller receives the concentration data measured by the gas analyzer and compares with the initial set concentration value, and then adjusts the opening degree of the automatic water vapor nozzle and the automatic carbon dioxide nozzle, so that the concentration of each gas component in the environment creating room reaches the required level after a period of time.

[0015] The device and method of the embodiment of the present application can quickly create a dry air environment with a dew point temperature of-80℃ or higher. The device can greatly reduce the environment creating time and labor cost. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The structure diagram of the embodiment of the present application.

[0017] In the figure, 1 is an environment creating room, 2 is a dew point meter, 3 is an air duct, 4 is an air component mixing tank, 5 is a water vapor adding device, 6 is an air stirrer, 7 is an air blower, 8 is a stop valve, and 9 is a vacuum air pump. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are merely intended to illustrate and explain the present application, and are not intended to limit the present application, and the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0019] The device and method for quickly creating an extremely low dew point air environment according to the embodiments of the present application can create an environment with any water vapor concentration within a reasonable range, greatly reducing the cost of creating the environment and the labor cost, by taking the water vapor concentration of the raw gas used to configure the low-humidity air as the lower limit of the water vapor concentration of the created low-humidity environment.

[0020] Referring to Figure 1 The device for quickly creating an extremely low dew point air environment according to the embodiments of the present application includes an air component mixing tank 4, a water vapor adding device 5, a vacuum air pump 9, a dew point meter 2, and a blower 7. The water vapor adding device 5 is connected to the first inlet of the air component mixing tank 4, and the air component mixing tank 4 is provided with a nitrogen inlet and an oxygen inlet. The outlet of the air component mixing tank 4 is connected to the inlet of the blower 7 through a first pipeline, and the outlet of the dew point meter 2 is connected to the second inlet of the air component mixing tank 4 through a second pipeline. In use, the vacuum air pump 9 is connected to the first outlet of an environment creating chamber 1 through a third pipeline, the outlet of the blower 7 is connected to the inlet of the environment creating chamber 1 through a fourth pipeline, and the second outlet of the environment creating chamber 1 is connected to the inlet of the dew point meter 2 through a fifth pipeline.

[0021] In the above embodiments, the environment creating chamber 1 is used to create the required environment. The vacuum air pump 9 is used to create a vacuum in the environment creating chamber 1. The dew point meter is arranged at the air outlet of the environment creating chamber 1 and is used to detect the water vapor concentration of the air flowing out of the environment creating chamber 1. The water vapor adding device 5 is used to add the required water vapor to the air component mixing tank 4. The blower 7 is used to make the air in the entire device flow smoothly. The air component mixing tank 4 is used to mix the air components.

[0022] Preferably, valves are arranged in the first pipeline, the second pipeline, the third pipeline, the fourth pipeline, and the fifth pipeline, respectively. The valves can be used to control the opening and closing of the pipelines. Preferably, the first pipeline, the second pipeline, the third pipeline, the fourth pipeline, and the fifth pipeline are air pipes 3. Preferably, the valves are stop valves 8.

[0023] Preferably, an air agitator 6 is arranged at the lower part of the air component mixing tank 4. The air agitator 6 is used to uniformly mix the gas. In use, oxygen, nitrogen, and water vapor are introduced into the air component mixing tank 4. The oxygen, nitrogen, and water vapor are uniformly mixed by starting the air agitator 6.

[0024] Preferably, the nitrogen inlet and the oxygen inlet are located on the side of the air component mixing box 4, the first inlet is located on the side of the air component mixing box 4, and the side on which the first inlet is located is opposite to the side on which the oxygen inlet is located; the outlet of the air component mixing box 4 is located on the front side or the rear side of the air component mixing box 4, and the second inlet of the air component mixing box 4 is located on the rear side or the front side of the air component mixing box 4, and the face on which the second inlet of the air component mixing box 4 is located is opposite to the face on which the outlet of the air component mixing box 4 is located. With this inlet and outlet layout, the raw gas required for the configuration of low-humidity air can be more fully mixed, and the quality of the configured low-humidity air is closer to the actual low-humidity air.

[0025] In the above embodiment, the device is used to create an extremely dry air environment with a dew point temperature above -80 to -40 degrees Celsius.

[0026] The device and the method for quickly creating an extremely low dew point air environment using the device of the above embodiment include:

[0027] Step one: calculate the theoretical water vapor concentration after vacuuming, and use the vacuum air pump 9 to pump out the air in the environment creating chamber 1. Specifically, after the vacuum air pump 9 is pumped, the valve in front of the vacuum air pump 9 is closed. The theoretical water vapor concentration C ppm，vac Determined by formula (1):

[0028]

[0029] Where: C ppm，vac is the theoretical water vapor concentration in the environment creating chamber 1 after vacuuming; P' is the pressure value in the environment creating chamber 1 after vacuuming; C' ppm is the volume concentration of water vapor in the environment creating chamber 1 before vacuuming; P is the required pressure value in the environment creating chamber 1.

[0030] The concentration data measured by the dew point meter is compared with the theoretical concentration data, and the error is kept within a reasonable range, then the dew point meter is correctly operated, the step is successful, and the next step is performed.

[0031] Step two: pour air-proportioned nitrogen and oxygen into the air component mixing box 4, start the fan 6, mix the oxygen and nitrogen sufficiently, so that the pressure in the air component mixing box 4 reaches the required value, and then close the stop valves in front of and behind the air component mixing box 4. Specifically, the theoretical value of the pressure required in the air component mixing box 4 can be determined by formula (2):

[0032]

[0033] Where, P fix represents the theoretical pressure value of the air component mixing box 4. Vsum V represents the total volume of the entire device and the air flow space in the environment creating chamber 1, including the volume of the hollow part of each pipe, the volume of the hollow part of the environment creating chamber 1 and the air component mixing tank 4. fix P represents the required pressure value in the environment creating chamber 1.

[0034] Step three: open the stop valves before and after the air component mixing tank 4, and set the dew point meter 2 at the air outlet of the environment creating chamber 1 to detect the actual water vapor concentration C ppm，R .

[0035] Step four: open the stop valves before and after the air component mixing tank 4, and set the dew point meter 2 at the air outlet of the environment creating chamber 1 to detect the water vapor concentration in the air flow from the environment creating chamber 1. Specifically, after the nitrogen and oxygen in the proportion of the filled air, the theoretical concentration of water vapor in the environment creating chamber 1 is determined by formula (3), formula (4), formula (5), formula (6) and formula (7):

[0036]

[0037] m = m N + m O + m vac Formula (4)

[0038]

[0039] Wherein: C ppm is the initial theoretical water vapor concentration in the environment creating chamber 1; T is the temperature in the environment creating chamber 1; M is the relative molecular mass of water vapor; m is the theoretical mass of water vapor added with nitrogen, oxygen and the residual water vapor after vacuumizing; P is the required air pressure value in the environment creating chamber 1; V is the volume of the environment creating chamber 1; m N is the mass of water vapor in the added nitrogen; C ppm′N is the water vapor concentration in the added nitrogen; V N is the volume of the added nitrogen; P N is the pressure of the added nitrogen; T N is the temperature of the added nitrogen; m O is the mass of water vapor in the added oxygen; C ppm′O is the water vapor concentration in the added oxygen; V O is the volume of the added oxygen; P O is the pressure of the added oxygen; T O is the temperature of the added oxygen.

[0040] The actual water vapor concentration data measured by the dew point instrument in step 3 is compared with the theoretical water vapor concentration data, and the error is kept within a reasonable range, so that the dew point instrument is in normal operation and the measured value is correct, and the experiment is successful.

[0041] Step five: the actual water vapor concentration data measured by the dew point instrument 2 is compared with the initial set concentration value, the water vapor mass m in the environment creating chamber after adding nitrogen and oxygen is determined by formula (8), and then the total mass of water vapor Δm added by the water vapor adding device 5 into the air component mixing box 4 is adjusted according to formula (9).

[0042]

[0043] Δm = m1-m R Formula (9)

[0044] Wherein: m R is the actual water vapor mass in the environment creating chamber 1; C ppm’R is the actual water vapor concentration measured by the dew point instrument 2 in the environment creating chamber 1; m l represents the mass of water vapor required to create the environment; and Δm represents the mass of water vapor required to be added by the water vapor adding device 5 into the environment creating chamber 1.

[0045] Step six: after obtaining the total mass of water vapor Δm required to be added by the water vapor adding device 5 into the environment creating chamber 1 from step five, Δm d is distributed to the water vapor adding amount, wherein Δm d = Δm / K, K is determined according to the actual situation, the air stirrer (6) is opened to mix water vapor; the dew point instrument (2) is used to detect the concentration of water vapor in the environment creating chamber (1); and according to the actual water vapor concentration C ppm’R detected by the dew point instrument (2), the amount of water vapor added by the water vapor adding device (5) into the air component mixing box (4) is adjusted until the water vapor concentration reaches the requirement.

[0046] In the embodiment of the application, the environment creating chamber 1 is pre-vacuumized by the vacuum air pump 9, then nitrogen and oxygen are filled into the air component mixing box 4 according to the normal air component ratio, the air blower 7 is opened, and the dew point instrument displays the water vapor content in the environment creating chamber 1. According to the difference between the actual water vapor concentration and the target water vapor concentration required to create the environment, the amount of water vapor added into the air component mixing box is adjusted by the PID automatic control system (steps five and six), so as to create the required environment.

[0047] Compared with the prior art, the method of the embodiment of the present application can quickly create an extremely low dew point environment without using complex multi-stage deep dehumidification technology, and the dew point range created can be adjusted at will, thereby effectively reducing the creation cost and energy consumption of an extremely dry environment.

[0048] The extreme dew point temperature limit value created by the embodiment of the present application depends on the minimum vacuum degree of the vacuum pumping device and the water content in the added nitrogen and oxygen, and the theoretical minimum dew point can reach-80 DEG C. By adjusting the water vapor mass added to the environment, the dew point temperature in the environment created room 1 can reach any set value.

[0049] The device of the embodiment of the present application can also be applied to create an environment with any dew point value. Compared with the traditional dehumidification method, the environment creation speed is greatly improved, and is suitable for occasions requiring rapid provision of a large amount of dry air. The existing dehumidification technology generally directly removes the water vapor in the humid air through condensation, absorption, adsorption and the like, which requires a large amount of time and energy consumption. The present scheme adopts a gas mixing method, uses the feature that the water vapor content in the high-purity nitrogen and oxygen on the market is almost zero, and according to the proportion of nitrogen and oxygen in the air, the air with extremely low dew point temperature can be quickly configured.

[0050] It should be noted that in this document, the terms "comprise", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or device. Without more limitations, the element defined by the statement "comprises a" does not exclude the presence of another identical element in the process, method, article or device including the element.

[0051] The above description is only the preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation made according to the content of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A device for rapidly creating an extremely low dew point air environment, characterized by, The device comprises an environment creating chamber (1), a dew point instrument (2), a gas circulation pipeline (3), an air component mixing box (4), a water vapor adding device (5), an air agitator (6), a blower (7), various valves (8), and a vacuum air pump (9). The water vapor adding device (5) is connected with the first inlet of the air component mixing box (4), and the air component mixing box (4) is provided with a nitrogen inlet and an oxygen inlet; the outlet of the air component mixing box (4) is connected with the inlet of the blower (7) through a first pipeline, and the outlet of the dew point instrument (2) is connected with the second inlet of the air component mixing box (4) through a second pipeline. In use, the vacuum air pump (9) is connected with the first outlet of the environment creating chamber (1) through a third pipeline, the outlet of the blower (7) is connected with the inlet of the environment creating chamber (1) through a fourth pipeline, the second outlet of the environment creating chamber (1) is connected with the inlet of the dew point instrument (2) through a fifth pipeline, and the first, second, third, fourth and fifth pipelines are respectively provided with valves.

2. The apparatus for quickly creating an extremely low dew point air environment according to claim 1, wherein The air agitator (6) is arranged in the lower part of the air component mixing box (4).

3. The apparatus for quickly creating an extremely low dew point air environment according to claim 1, wherein The device is used for creating a dry air environment with a dew point temperature above -80℃.

4. The apparatus for quickly creating an extremely low dew point air environment according to claim 1, wherein The nitrogen inlet and the oxygen inlet are located on the side of the air component mixing box (4), and the first inlet is located on the side of the air component mixing box (4), and the side where the first inlet is located is opposite to the side where the oxygen inlet is located. The outlet of the air component mixing box (4) is located on the front side or the rear side of the air component mixing box (4), and the second inlet of the air component mixing box (4) is located on the rear side or the front side of the air component mixing box (4), and the face where the second inlet of the air component mixing box (4) is located is opposite to the face where the outlet of the air component mixing box (4) is located.

5. A method for rapidly creating an extremely low dew point air environment, characterized by, The method comprises: S10 calculating the proportion of oxygen, nitrogen and water vapor to be introduced into the environment creating chamber (1) according to the dew point temperature required by the environment; S20 completely extracting the air in the environment creating chamber (1) to form a vacuum environment; S30 pouring nitrogen, oxygen and water vapor into the air component mixing box (4), wherein the proportion of water vapor is less than the proportion calculated in S10, and the air agitator (6) is started to mix the nitrogen, oxygen and water vapor; S40 detecting the concentration of water vapor in the environment creating chamber (1) by using the dew point instrument (2); S50 adjusting the amount of water vapor added into the air component mixing box (4) by the water vapor adding device (5) according to the concentration of water vapor detected by the dew point instrument (2), and returning to S40 until the proportion of water vapor is equal to the proportion calculated in S10.

6. The method of rapidly creating an extremely low dew point air environment of claim 5, wherein, The second outlet of the environment creating chamber (1) is connected with the inlet of the dew point instrument (2) through a fifth pipeline, and the outlet of the dew point instrument (2) is connected with the second inlet of the air component mixing box (4) through a second pipeline, so that the gas measured by the dew point instrument (2) flows back to the air component mixing box (4) to form internal circulation of the gas in the system.

7. The method for quickly creating an extremely low dew point air environment according to claim 5, wherein The dew point temperature of the environment that can be created is -80℃ to -40℃.

Images