CN112797513A - Non-equilibrium plasma charge induced condensation dehumidification device and method - Google Patents
Non-equilibrium plasma charge induced condensation dehumidification device and method Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
- F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
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- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
- F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
- F24F2003/144—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification by dehumidification only
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Abstract
The invention discloses a non-equilibrium plasma charge induction dehumidification device and a dehumidification method, wherein the device comprises: the ionization chamber is internally provided with a first channel which is used for introducing cold air and is internally provided with a non-equilibrium state plasma discharge device, and a second channel which is sleeved outside the first channel at intervals along the axial direction of the first channel and is used for introducing pretreated moisture-containing gas; the mixing chamber is connected with the ionization chamber, and the first channel and the second channel are respectively communicated with the mixing chamber and are used for introducing the non-equilibrium plasma and the pretreated moisture-containing gas into the mixing chamber; a refrigerator for providing the required cold air to the ionization chamber is also included. The device is used for enabling cold air to be weakly ionized through nonequilibrium discharge so as to contain a large amount of charged particles; and then the moisture-containing gas is mixed with the charged cold air, so that the water vapor is condensed on the charged particles and grows into liquid drops, and the steam-water separation is promoted. The device is simpler, has wider application range and higher dehumidification efficiency, and does not need a desiccant.
Description
Technical Field
The invention belongs to the technical field of dehumidification, and relates to a non-equilibrium plasma charge induced condensation dehumidification device and a dehumidification method.
Background
With the continuous development of industrial technology in China, the automation degree of enterprises is higher and higher, and more electrical equipment is put into enterprise production. The safe operation of equipment has higher requirements on the temperature and the humidity of the environment, and if the equipment operates in the environment with higher humidity for a long time, the phenomena of insulation aging, short circuit leakage, accelerated metal corrosion and the like can be generated, so that the service life of the equipment is shortened, and even accidents occur. For example, in places such as precision instrument rooms, machine rooms, hospitals, libraries, archives, printing factories, etc., if the environmental humidity is high, it may cause equipment failure, product mildew, etc. In daily life, the air humidity is high, so that the possibility of suffering diseases of people, particularly respiratory diseases, can be increased. In addition, many people feel tired, impatient, etc. in a humid environment. Therefore, the control of the air humidity has important significance for industrial production and life of people.
The traditional dehumidification method mainly comprises a ventilation method, a heating method, a freezing method, an adsorption method, a compression method and the like. The ventilation method is to open the door or window to enhance the air circulation and exchange the air with the outdoor dry air. This method is simple, economical and consumes no energy, and is most commonly used. However, the ventilation method has high requirements for outdoor environment, and the dehumidification effect cannot be achieved in rainy days. The heating method mainly comprises the steps of raising the temperature of air by a heater and further reducing the relative humidity of the air, but the absolute humidity of the air is not reduced, and the air becomes stale, so that the application range is small. The freezing method is mainly to reduce the temperature below the dew point to condense and separate out water vapor, thereby achieving the purpose of dehumidification. The freezing method has stable performance and can continuously work. However, the freezing method has two main problems, one of which is to condense the water vapor in the wet air and needs to provide condensation nuclei, the condensation temperature in the common homogeneous condensation is far lower than the dew point, the supersaturation degree of the condensation nuclei formed by the homogeneous condensation under the atmospheric pressure needs to reach 5-20, namely the local vapor partial pressure is 5-20 times higher than the saturation pressure, so that the condensation process can be started, and the freezing method is difficult to directly condense the homogeneous portions of the wet air. The second freezing method can only condense the gas-solid heat exchange surface, so in order to increase the condensation rate, the gas-solid heat exchange area must be greatly increased. Therefore, the refrigeration method has higher equipment energy consumption and higher operation and management costs. The adsorption method includes a solid adsorption method and a liquid adsorption method. The solid adsorption method mainly utilizes the capillary action of certain solid surfaces to adsorb or absorb water vapor in air. Common solid adsorbents mainly comprise activated carbon, sodium hydroxide, anhydrous calcium chloride, anhydrous copper sulfate, silica gel and the like. The basic principle of the liquid adsorption method is similar to that of the solid adsorption method, and common liquid adsorbents mainly comprise salt solutions of lithium bromide, lithium chloride and the like, and the salt solutions are sprayed in the air to absorb water vapor. The adsorption method has simple equipment and small early investment, but the adsorbent needs to be replaced regularly. If some solid adsorbents need to be recycled, the solid adsorbents also need to be subjected to a heating process, so that the later cost is high. The compression dehumidification method is similar to the freezing method except that the humid air is compressed first and then cooled to condense the water vapor. The method uses pressurization to realize homogeneous condensation of water vapor in wet air, but the supersaturation degree required by the homogeneous condensation is too high, so that the energy consumption is too large, a pressure container needs to be designed and manufactured, the cost is higher, and the method is suitable for occasions with small air volume.
Disclosure of Invention
In order to overcome the problems in the prior art, the present invention provides a non-equilibrium plasma charge induced condensation dehumidifier and a dehumidifying method. The device firstly uses a non-equilibrium state discharge method to make cold air weakly ionized so as to contain a large amount of charged particles; then mixing the moisture-containing gas with the charged cold air; the water vapor is condensed on the charged particles, so that the steam-water separation is promoted. The device is simpler, has wider application range and higher dehumidification efficiency, and does not need a desiccant.
In order to realize the purpose of the invention, the adopted technical scheme is as follows: an apparatus for non-equilibrium plasma charge induced dehumidification, comprising:
the ionization chamber is internally provided with a first channel for introducing cold air and a second channel which is sleeved outside the first channel at intervals along the axial direction of the first channel and is used for introducing pretreated moisture-containing gas, and the first channel is internally provided with a non-equilibrium state plasma discharge device which is used for ionizing the cold air passing through the first channel into non-equilibrium state plasma;
the mixing chamber is connected with the ionization chamber, and the first channel and the second channel are respectively communicated with the mixing chamber and are used for introducing the non-equilibrium plasma and the pretreated moisture-containing gas into the mixing chamber;
the cross section of the first channel is circular, and the cross section of the second channel is circular.
Furthermore, the ionization chamber is provided with a connecting end and is connected with the mixing chamber through the connecting end, the ionization chamber is provided with a cold air inlet and a pretreated humid gas inlet in a staggered mode at the connecting end, the connecting end of the ionization chamber is provided with a non-equilibrium state plasma outlet and a pretreated humid gas outlet, two ends of the first channel are respectively connected with the cold air inlet and the non-equilibrium state plasma outlet, and two ends of the second channel are respectively connected with the pretreated humid gas inlet and the pretreated humid gas outlet;
the mixing chamber is provided with a fluid inlet and a fluid outlet, the fluid inlet being opposite the non-equilibrium plasma outlet and the pretreated moisture-containing gas outlet.
Furthermore, a heat insulation layer is arranged between the first channel and the second channel, and the phenomenon that the surface of the second channel is condensed in a heterogeneous mode to block airflow flowing is avoided.
Further, the non-equilibrium plasma discharge device comprises a middle medium layer, an upper electrode plate and a lower electrode plate which are respectively arranged at the top and the bottom of the middle medium layer, and 2 leads which are respectively electrically connected with the upper electrode plate and the lower electrode plate, wherein the leads are led out of the ionization chamber.
Furthermore, the materials of the upper electrode plate and the lower electrode plateThe copper is adopted as the material, and the thickness of the upper electrode plate and the lower electrode plate is 0.5 +/-0.15 mm; the intermediate medium layer is made of ceramic or glass, and the dielectric constant epsilon of the intermediate medium layer is more than or equal to 5; the widths of the upper electrode plate, the lower electrode plate and the middle dielectric layer are respectively L1, L2 and L3, and the width relation among the upper electrode plate, the lower electrode plate and the middle dielectric layer meets the following requirements:
the lengths of the upper electrode plate, the lower electrode plate and the middle dielectric layer are respectively H1, H2 and H3, the length H3 of the middle dielectric layer is equal to 2-2.5 times of the inner diameter of the first channel, and the length relationship among H1, H2 and H3 meets the following requirements:
this is a typical asymmetric electrode arrangement, which can ensure not only the space for the edge discharge of the upper electrode plate, but also that no significant arc is generated, and can control the discharge within a relatively weak range.
A wet gas treatment method is carried out based on the non-equilibrium plasma charge induction dehumidification device, and comprises the following steps:
firstly, cold air enters a first channel, and when passing through a non-equilibrium plasma discharge device, the cold air is ionized to form non-equilibrium plasma (water molecules, nitrogen, oxygen and the like in the air are ionized to generate O-、OH-、H2O+、N+、N2 +E, charged particles) and the non-equilibrium plasma enters the mixing chamber along the first channel;
secondly, moisture-containing gas enters the mixing chamber through a second channel and is mixed with the non-equilibrium plasma, and polar water molecules can deviate and gather due to the existence of electric charges to form an initial condensation core and further form clusters;
and thirdly, water molecules in the wet gas contained in the mixing chamber are further condensed and grow on the surface of the cluster to form liquid drops, so that gas-liquid separation is realized.
Further, it is toThe temperature of the cold air entering the first channel needs to reach the following conditions: after the cold air in the first channel and the moisture-containing gas in the second channel are fully mixed in the mixing chamber to form mixed gas, the water vapor saturation partial pressure p corresponding to the temperature of the mixed gasvShould be slightly larger than the partial pressure p of the water vapor, i.e. the supersaturation degree p of the water vapor in the mixed gasv1.01 to 1.02,/p whereinvP is the partial pressure of water vapor saturation corresponding to the temperature of the mixed gas, and is the local partial pressure of water vapor (i.e., the partial pressure of water vapor in the atmospheric pressure of the region where the dehumidification method of the present invention is carried out).
Furthermore, in the ionization chamber, the flow velocity of the wet gas contained in the second channel is limited to 0.1-0.2 m/s; the flow rate of the cooling air in the first channel is limited to 3-5 m/s.
Furthermore, the operating voltage V of the non-equilibrium plasma discharge device is 2-3.5 kV, and the frequency f is 20 ± 5 kHz.
Further, the cold air ionization rate is 10-8～10-6I.e. a total charged particle number density of about 10 after passing cold air through the discharge first passage at atmospheric pressure16～1018Per m3. This is typically a weakly ionized gas. The ionization degree cannot be too high, too high ionization degree needs to consume too much electric energy, and meanwhile, the gas temperature can be increased, and the condensation efficiency is influenced.
After the charged particles induce the condensation of water vapor in the mixing chamber, the moisture in the humid air is separated in the form of droplets, and thereafter the liquid water can be collected by conventional methods such as centrifugal separation, natural sedimentation, surface adsorption, and the like.
Compared with the prior art, the invention has the following beneficial effects:
after the structure of the invention is adopted, cold air flows through the non-equilibrium plasma discharge device, and is ionized under high-frequency voltage to generate charged particles (non-equilibrium plasma) which enter the mixing chamber. The moisture-containing gas flows from the second channel and meets the charged particles in the mixing chamber. Under the action of electric charges, water molecules deflect and gather to form an initial condensation core and further form a molecular cluster, and then the water molecules are condensed on the condensation core and finally grow into liquid drops, so that dehumidification in moisture-containing gas is realized.
The invention creatively provides that charged particles generated by an ionization method are used as a water vapor condensation core, rapid condensation can be realized for moisture-containing gas with supersaturation degree within the range of 1.01-1.02, and the defect that the traditional method needs high supersaturation degree is overcome. Meanwhile, the gas containing charged particles and the moisture-containing gas are fully mixed, so that the contact range is larger, and the defect that the traditional method needs a large heat exchange area is overcome. The invention has the advantages of simple device, simple and convenient operation, no need of ventilation, heating and adsorbent, low cost, wider application range and good dehumidification effect.
Drawings
FIG. 1 is a schematic diagram of the operation of a non-equilibrium plasma charge-induced condensation dehumidifier according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a non-equilibrium plasma charge-induced condensation dehumidifier according to an embodiment of the present invention (the refrigerator is omitted in the figure);
FIG. 3 is a left side view of an unbalanced plasma discharge apparatus according to an embodiment of the present invention;
FIG. 4 is a front view of an unbalanced plasma discharge apparatus according to an embodiment of the present invention;
FIG. 5 is a top view of an ionization chamber in an embodiment of the invention;
FIG. 6 is a right side view of an ionization chamber in an embodiment of the present invention;
the reference numerals in the figures are as follows:
1. the plasma discharge device comprises a first passage, a second passage, a heat insulation layer, a non-equilibrium state plasma discharge device, an upper electrode plate, an intermediate medium layer, a lower electrode plate, a mixing chamber, an ionization chamber, a moisture-containing gas inlet, a cold air inlet, a refrigerating machine and a gas inlet, wherein the non-equilibrium state plasma discharge device comprises 401, 402, the intermediate medium layer, 403, the lower electrode plate, 5, the mixing chamber, 6, the ionization chamber, 7, the moisture-containing gas inlet;
l1: the width of the upper electrode plate;
l2: the width of the lower electrode plate;
l3: the width of the middle dielectric layer;
h1: the length of the upper electrode plate;
h2: the length of the lower electrode plate;
h3: length of the middle dielectric layer.
Detailed Description
The invention is described in more detail below with reference to the following examples:
the invention provides a non-equilibrium plasma charge induced condensation dehumidifying device, which adopts high-frequency voltage discharge to make cold air generate weak ionization and generate O-、OH-、H2O+、N+、N2 +Charged particles such as e; when water molecules in the moisture-containing gas meet charged particles in cold air, the water molecules are known to be polar molecules, a point charge electric field generated by the charged particles is a typical non-uniform electric field, and the point charge electric field can induce the water molecules to deflect and gather to form an initial condensation core and further form a cluster, so that the rate of forming the condensation core in the homogeneous condensation process is greatly increased; the water molecules in the mixed gas can grow rapidly on the condensation core, and are condensed into liquid drops, and then the liquid drops are collected and further processed. The method is obviously different from the traditional method, the invention does not further reduce the system energy in the condensation heat release process, but aims at the difficulty of large homogeneous phase condensation difficulty, adopts non-equilibrium discharge to weakly ionize the gas, and inputs a small amount of electric energy to reduce the condensation difficulty, so as to realize rapid induced condensation. The advantages mainly include that ventilation, heating and adsorbent are not needed, the cost is low, the equipment is simple, and the application range is wider; compared with a freezing method and a compression method, the invention provides that charged particles generated by an ionization method are used as a water vapor condensation core, so that the supersaturation degree of the condensation core can be greatly reduced, homogeneous phase condensation in wet vapor under low supersaturation degree is realized, and the defects of high supersaturation degree and large heat exchange area required in the traditional method are overcome.
It is well known that discharging a gas converts electrical energy into internal gas energy, thereby raising the temperature of the gas, which apparently inhibits condensation and promotes evaporation. For example, in a dehumidification apparatus of patent CN 200810084034.8 and a regeneration structure thereof, it is proposed to dry an adsorption apparatus using charged particles. This process is actually the reverse of condensation, which uses plasma to promote evaporation of water from the adsorption device, thereby achieving regeneration. In general, practitioners of the thermal energy related arts recognize that the input of energy promotes the evaporation process and suppresses the condensation process, as a matter of course. However, due to the fact that the condensation core is absent in the heterogeneous condensation process, the condensation process is practically difficult to occur when the moisture-containing gas and the cold air are mixed, and a large degree of supersaturation or a large heat exchange surface area is generally required. In experiments, the inventor finds that when a discharge structure, a condensation device and fluid parameters are properly designed, a proper amount of weak discharge occurs before gas condensation, the quantity of charged particles in the gas can be increased, and meanwhile, the temperature rise of the gas is extremely low, so that the effect of inducing rapid condensation can be realized. Although the discharge process does input a small amount of energy to the gas, the energy input can effectively reduce the difficulty of the condensation and promote the condensation process, which is not contrary to the existing physical theory and experimental result. The scheme is quite different from the patent technology mentioned above and is completely different from the common recognition of the prior industry, so the invention has remarkable creativity.
Referring to fig. 2 to 6, the non-equilibrium plasma charge induced dehumidification apparatus in this embodiment includes:
the plasma treatment device comprises an ionization chamber 6, wherein a first channel 1 for introducing cold air and a second channel 2 which is sleeved outside the first channel 1 along the axial direction of the first channel 1 at intervals and is used for introducing pretreated moisture-containing gas are arranged in the ionization chamber 6, and a non-equilibrium plasma discharge device 4 is arranged in the first channel 1 and is used for ionizing the cold air passing through the first channel 1 into non-equilibrium plasma;
the mixing chamber 5 is connected with the ionization chamber 6, and the first channel 1 and the second channel 2 are respectively communicated with the mixing chamber 5 and used for introducing the non-equilibrium plasma and the pretreated moisture-containing gas into the mixing chamber 5;
the cross section of the first channel 1 is circular, and the cross section of the second channel 2 is circular.
Specifically, the method comprises the following steps: the ionization chamber 6 is provided with a connecting end, the ionization chamber 6 is connected with the mixing chamber 5 through the connecting end, the ionization chamber 6 is provided with a cold air inlet 8 and a pretreated humid gas inlet 7 in a staggered connection mode, the connecting end of the ionization chamber 6 is provided with a non-equilibrium state plasma outlet and a pretreated humid gas outlet, two ends of the first channel 1 are respectively connected with the cold air inlet 8 and the non-equilibrium state plasma outlet, and two ends of the second channel 2 are respectively connected with the pretreated humid gas inlet 7 and the pretreated humid gas outlet; the mixing chamber 5 is provided with a fluid inlet and a fluid outlet, the fluid inlet being opposite to the non-equilibrium plasma outlet and the pre-treated moisture-containing gas outlet.
In this embodiment, the inner wall of the first channel 1 is made of glass, the inner wall of the second channel 2 is made of acrylic material, the insulating layer 3 is arranged between the first channel 1 and the second channel 2, the non-equilibrium plasma discharge device 4 comprises a middle dielectric layer 402, an upper electrode plate 401 and a lower electrode plate 403 which are respectively arranged at the top and the bottom of the middle dielectric layer 402, and 2 conducting wires which are respectively electrically connected with the upper electrode plate 401 and the lower electrode plate 403, and the conducting wires are led out of the ionization chamber 6 to be connected with a power supply.
The upper electrode plate 401 and the lower electrode plate 403 are both made of metal copper, and the thicknesses of the upper electrode plate 401 and the lower electrode plate 403 are both 0.5 mm; the intermediate dielectric layer 402 is made of ceramic or glass, and the dielectric constant epsilon of the intermediate dielectric layer 402 is more than or equal to 5; the widths of the upper electrode plate 401, the lower electrode plate 403 and the middle dielectric layer 402 are respectively L1, L2 and L3, and the width relationship among the three meets the following requirements:
the lengths of the upper electrode plate 401, the lower electrode plate 403 and the middle dielectric layer 402 are respectively H1, H2 and H3, the length H3 of the middle dielectric layer 402 is equal to 2-2.5 times of the inner diameter of the first channel, and the length relationship among H1, H2 and H3 meets the following requirements:
a moisture-containing gas processing method, as shown in fig. 1, based on the non-equilibrium plasma charge induced dehumidification device, comprising the following steps:
firstly, cold air enters the first channel 1, and when passing through the non-equilibrium plasma discharge device 4, the cold air is ionized to form non-equilibrium plasma (water molecules, nitrogen, oxygen and the like in the air are ionized to generate O-、OH-、H2O+、N+、N2 +E, charged particles) and the non-equilibrium plasma enters the mixing chamber along the first channel;
secondly, moisture-containing gas enters the mixing chamber 5 through the second channel 2 and is mixed with the non-equilibrium plasma, and polar water molecules can shift and gather due to the existence of electric charges to form an initial condensation core and further form clusters;
and thirdly, water molecules in the moisture-containing gas in the mixing chamber 5 are further condensed and grow on the surface of the cluster to form liquid drops, so that gas-liquid separation is realized.
Further, the temperature of the cool air entering the first passage 1 needs to reach the following condition: after the cold air in the first passage 1 and the moisture-containing gas in the second passage 2 are fully mixed in the mixing chamber 5 to form a mixed gas, the temperature of the mixed gas corresponds to the water vapor saturation partial pressure pvShould be slightly larger than the partial pressure p of the water vapor, i.e. the supersaturation degree p of the water vapor in the mixed gasv1.01 to 1.02,/p whereinvThe partial pressure of the mixed gas corresponding to the temperature of the mixed gas is saturated by water vapor, and p is the local partial pressure of the water vapor.
In the ionization chamber 6, the flow velocity of the moisture-containing gas in the second channel 2 is limited to 0.1-0.2 m/s; the flow rate of the cooling air in the first passage 1 is limited to 3-5 m/s. The operating voltage V of the non-equilibrium plasma discharge device 4 is 2-3.5 kV, and the frequency f is 20 kHz. Cold air ionization rate of 10-8～10-6I.e. a total charged particle number density of about 10 after passing cold air through the discharge first passage at atmospheric pressure16～1018Per m3. This is typically a weakly ionized gas. The ionization degree cannot be too high, too high ionization degree needs to consume too much electric energy, and meanwhile, the gas temperature can be increased, and the condensation efficiency is influenced.
More specifically, the inner diameter of the first channel 1 is 12mm, the flow rate of cold air in the first channel 1 is limited to 3-5 m/s in the process, a pump can be used for providing power for the cold air, and the flow rate of the cold air can be adjusted according to actual requirements. In the non-equilibrium plasma discharge device inside the first channel 1, the cold air generates charged particles under the action of the high-frequency alternating voltage. The discharge voltage was 2.5kV and the discharge frequency was 20 kHz. The ionization rate of cold air after passing through is about 10-8. The flow velocity of the moisture-containing gas in the second channel 2 is 0.2m/s, and the advantage that the second channel 2 is in the shape of a circular pipe is that the moisture-containing gas can be more fully contacted with the charged particles in the mixing chamber, so that the formation of molecular clusters is accelerated. In addition, the second passageway 2 wraps up the insulation material outward, consequently can not produce the heat exchange with cold air, guarantees not taking place to condense in the first passageway 1, avoids blockking up the passageway, and the insulation material is the glass cotton.
After the charged particles induce the condensation of water vapor in the mixing chamber, the moisture in the humid air is separated in the form of droplets, and thereafter the liquid water can be collected by conventional methods such as centrifugal separation, natural sedimentation, surface adsorption, and the like.
In this embodiment, the moisture-containing gas is 35 ℃ saturated humid air, and the cold air is 15 ℃, and after this embodiment, moisture in the moisture-containing gas can be removed rapidly without consuming a desiccant, and without requiring a large heat exchange area.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and their concepts should be equivalent or changed within the technical scope of the present invention.
The present invention is not limited to the above embodiments, and those skilled in the art can implement the present invention in other embodiments according to the disclosure of the present invention, or make simple changes or modifications on the design structure and idea of the present invention, and fall into the protection scope of the present invention. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
Claims (9)
1. A non-equilibrium plasma charge-induced dehumidification device is characterized in that: the method comprises the following steps:
the ionization chamber is internally provided with a first channel for introducing cold air and a second channel which is sleeved outside the first channel at intervals along the axial direction of the first channel and is used for introducing pretreated moisture-containing gas, a non-equilibrium plasma discharge device is arranged in the first channel and is used for ionizing the cold air passing through the first channel into non-equilibrium plasma, the cross section of the first channel is circular, and the cross section of the second channel is circular;
the mixing chamber is connected with the ionization chamber, and the first channel and the second channel are respectively communicated with the mixing chamber and are used for introducing the non-equilibrium plasma and the pretreated moisture-containing gas into the mixing chamber;
and the refrigerator is communicated with the first channel of the ionization chamber and is used for providing required cold air for the ionization chamber.
2. The non-equilibrium plasma conductance dehumidification device according to claim 1, wherein: the ionization chamber is provided with a connecting end and is connected with the mixing chamber through the connecting end, the ionization chamber is provided with a cold air inlet and a pretreated humid gas inlet in a staggered mode at the connecting end, the connecting end of the ionization chamber is provided with a non-equilibrium state plasma outlet and a pretreated humid gas outlet, two ends of the first channel are respectively connected with the cold air inlet and the non-equilibrium state plasma outlet, and two ends of the second channel are respectively connected with the pretreated humid gas inlet and the pretreated humid gas outlet;
the mixing chamber is provided with a fluid inlet and a fluid outlet, the fluid inlet being opposite the non-equilibrium plasma outlet and the pretreated moisture-containing gas outlet.
3. The non-equilibrium plasma charge induced dehumidification device according to claim 1, wherein: and a heat insulation layer is arranged between the first channel and the second channel.
4. The non-equilibrium plasma charge induced dehumidification device according to claim 1, wherein: the non-equilibrium plasma discharge device comprises a middle medium layer, an upper electrode plate and a lower electrode plate which are respectively arranged at the top and the bottom of the middle medium layer, and 2 leads which are respectively electrically connected with the upper electrode plate and the lower electrode plate, wherein the leads are led out to the outside of the ionization chamber.
5. The non-equilibrium plasma charge induced dehumidification device according to claim 4, wherein: the upper electrode plate and the lower electrode plate are made of metal copper, and the thickness of the upper electrode plate and the thickness of the lower electrode plate are both 0.5 +/-0.15 mm; the intermediate medium layer is made of ceramic or glass, and the dielectric constant epsilon of the intermediate medium layer is more than or equal to 5; the widths of the upper electrode plate, the lower electrode plate and the middle dielectric layer are respectively L1, L2 and L3, and the width relation among the upper electrode plate, the lower electrode plate and the middle dielectric layer meets the following requirements:
the lengths of the upper electrode plate, the lower electrode plate and the middle dielectric layer are respectively H1, H2 and H3, the length H3 of the middle dielectric layer is equal to 2-2.5 times of the inner diameter of the first channel, and the length relationship among H1, H2 and H3 meets the following requirements:
6. a method of treating moisture-containing gas, characterized by: the method is carried out on the basis of the non-equilibrium plasma charge induced dehumidification device as defined in any one of claims 1 to 5, and comprises the following steps:
firstly, cold air enters a first channel, and is ionized to form non-equilibrium plasma when passing through a non-equilibrium plasma discharge device, and the non-equilibrium plasma enters a mixing chamber along the first channel;
secondly, moisture-containing gas enters the mixing chamber through a second channel and is mixed with the non-equilibrium plasma, and polar water molecules can deviate and gather due to the existence of electric charges to form an initial condensation core and further form clusters;
thirdly, water molecules in the wet gas contained in the mixing chamber are further condensed and grow on the surface of the cluster to form liquid drops, so that gas-liquid separation is realized;
the temperature of the cool air entering the first passage needs to reach the following condition: after the cold air in the first channel and the moisture-containing gas in the second channel are fully mixed in the mixing chamber to form mixed gas, the supersaturation degree p of water vapor in the mixed gasv1.01 to 1.02,/p whereinvThe partial pressure of the mixed gas corresponding to the temperature of the mixed gas is saturated by water vapor, and p is the local partial pressure of the water vapor.
7. The wet gas processing method according to claim 6, characterized in that: in the ionization chamber, the flow velocity of the wet gas contained in the second channel is limited to 0.1-0.2 m/s; the flow rate of the cooling air in the first channel is limited to 3-5 m/s.
8. The wet gas processing method according to claim 6, characterized in that: the working voltage V of the non-equilibrium plasma discharge device is 2-3.5 kV, and the frequency f is 20 +/-5 kHz.
9. The wet gas processing method according to claim 6, characterized in that: the cold air ionization rate is 10-8～10-6。
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