CN118267836A - Renewable hollow dehumidification pipe, combined active dehumidification equipment and design method - Google Patents
Renewable hollow dehumidification pipe, combined active dehumidification equipment and design method Download PDFInfo
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- 238000007791 dehumidification Methods 0.000 title claims abstract description 104
- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000013461 design Methods 0.000 title claims description 8
- 238000001035 drying Methods 0.000 claims abstract description 126
- 238000010521 absorption reaction Methods 0.000 claims abstract description 69
- 238000010438 heat treatment Methods 0.000 claims abstract description 63
- 230000008929 regeneration Effects 0.000 claims abstract description 40
- 238000011069 regeneration method Methods 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 230000008569 process Effects 0.000 claims abstract description 33
- 238000003795 desorption Methods 0.000 claims abstract description 25
- 150000003839 salts Chemical class 0.000 claims abstract description 24
- 239000002131 composite material Substances 0.000 claims abstract description 10
- 239000010410 layer Substances 0.000 claims description 58
- 230000005855 radiation Effects 0.000 claims description 20
- 238000012546 transfer Methods 0.000 claims description 18
- 239000011159 matrix material Substances 0.000 claims description 13
- 230000007246 mechanism Effects 0.000 claims description 13
- 238000007789 sealing Methods 0.000 claims description 13
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 9
- 238000005485 electric heating Methods 0.000 claims description 8
- 230000005457 Black-body radiation Effects 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 229920006395 saturated elastomer Polymers 0.000 claims description 6
- 239000002274 desiccant Substances 0.000 claims description 5
- 239000002344 surface layer Substances 0.000 claims description 3
- 230000001172 regenerating effect Effects 0.000 claims description 2
- 239000002918 waste heat Substances 0.000 description 8
- 239000003463 adsorbent Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000004630 mental health Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000607479 Yersinia pestis Species 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 208000024335 physical disease Diseases 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The renewable hollow dehumidification pipe comprises an outer layer pipe and an inner layer pipe which is nested in the outer layer pipe; the heating wire is arranged in the inner layer tube, the heating medium is used for passing through the outer layer tube, and the outer layer tube is isolated from the inner layer tube; a plurality of groups of brackets are arranged outside the outer layer pipe, and drying strips are arranged through the brackets; the drying strips are made of a hygroscopic salt composite material; during the moisture absorption process, air continuously flows through the drying strips, and the surfaces of the drying strips have continuous water absorption capacity; in the desorption regeneration process, the heating wire is used for assisting in heating, heat is transferred to the drying strips, moisture moves from the inside of the drying strips to the surface and is released, and the moisture is taken away by flowing air to complete regeneration. The combined active dehumidification equipment comprises a renewable hollow dehumidification pipe, a guide pipe, a connecting pipe and a positioning plate, can be assembled into different scales and forms according to specific dehumidification requirements and running environments, and is flexible in use form and strong in universality.
Description
Technical Field
The invention belongs to the technical field of dehumidification, and particularly relates to a renewable hollow dehumidification pipe, combined active dehumidification equipment and a design method.
Background
Excessive humidity can negatively impact human physical and mental health, environmental comfort, and equipment reliability, and can lead to physical disease, pest reproduction, microbial growth, and metal corrosion. With the improvement of living standard and the increase of importance of physical and mental health, indoor environment quality is more and more concerned, and indoor dehumidification demands are increased.
The main dehumidification methods are mainly divided into three types: condensation dehumidification, surface adsorption and solution absorption. Among them, the condensation dehumidification method is mostly used in vapor compression refrigeration type air conditioning systems, and has high dehumidification speed, but high energy consumption and limited applicable environment temperature range. The surface adsorption method has limited water absorption rate and maximum water absorption capacity. The water absorption rate of the solution absorption method is reduced along with the water absorption process, and the liquid adsorbent is easy to pollute and corrode the environment. At the same time, the surface adsorption and solution absorption methods must also be regenerated by the input of electrical energy or other forms of energy after moisture absorption.
In summary, the existing dehumidification method cannot achieve low energy consumption, high hygroscopicity and convenience in use, but low carbon and environmental protection are important factors in technical development nowadays, so that a new technical scheme is necessary to be provided to optimize the comprehensive performance of the dehumidification device.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provide a renewable hollow dehumidification pipe, combined active dehumidification equipment and a design method, which can reduce the moisture absorption energy consumption while guaranteeing the moisture absorption performance.
In order to achieve the above purpose, the present invention has the following technical scheme:
The renewable hollow dehumidifying pipe comprises an outer layer pipe and an inner layer pipe which is nested in the outer layer pipe; the inner layer tube is provided with an electric heating wire and is communicated with the outside through a channel;
the outer layer pipe is used for passing through a thermal medium, and is isolated from the inner layer pipe;
the outer part of the outer layer pipe is provided with a plurality of groups of brackets, drying strips are arranged through the brackets, air flows through the outer part of the outer layer pipe, and a contact surface is formed between the drying strips and the air;
the drying strips are made of a hygroscopic salt composite material;
During the moisture absorption process, air continuously flows through the drying strips, and the surfaces of the drying strips have continuous water absorption capacity;
In the desorption regeneration process, a heat medium is introduced into the outer layer tube, and the heat is transmitted to the drying strip by combining with the auxiliary heating of the heating wire, so that the temperature of the drying strip is increased, the moisture moves from the inside of the drying strip to the surface and is released, and the moisture is taken away by flowing air, thereby completing the regeneration.
As a preferable scheme, the inner wall of the inner layer tube is provided with an absorption coating, and the outer wall of the inner layer tube is provided with an emission coating.
As a preferable scheme, the hygroscopic salt composite material consists of hygroscopic salt and a high-porosity hydrophilic matrix, wherein the hygroscopic salt is filled in the surface layer of the high-porosity hydrophilic matrix, and the hygroscopic salt has an absorption effect on moisture, and the high-porosity hydrophilic group has an absorption effect on moisture and can store liquid.
As a preferable scheme, one end of the support is provided with a baffle, the other end of the support is provided with a detachable sealing cover, the drying strip is assembled through the support, the baffle and the sealing cover, and when the regeneration times of the drying strip reach the use limit, the sealing cover is opened for replacement.
A combined active dehumidification device comprises a renewable hollow dehumidification pipe, a honeycomb duct, a connecting pipe and a positioning plate;
The connecting pipes are used for connecting the plurality of renewable hollow dehumidification pipes;
The positioning plate is used for arranging and positioning a plurality of renewable hollow dehumidification pipes which are connected together;
the head end of the head root renewable hollow dehumidifying pipe and the tail end of the tail root renewable hollow dehumidifying pipe are connected with a flow guiding pipe;
Air flows through the outside of the renewable hollow dehumidification pipe, and active dehumidification is completed by the drying strips;
After the drying strips absorb moisture to a saturated state, the drying strips enter a desorption regeneration process outside a humidity control place; heating the drying strips by introducing a heat medium into the outer layer pipe, and desorbing water from the drying strips to realize regeneration; when the energy provided by the heat medium can not meet the water desorption requirement of the drying strips, the electric heating wire is used for auxiliary heating.
As a preferable scheme, the renewable hollow dehumidification pipe is connected with the diversion pipe and the connection pipe through the connection sealing device.
As a preferable scheme, the arrangement form of the plurality of renewable hollow dehumidification pipes comprises any one of single-row series connection, double-row series connection and single-row parallel connection.
The design method of the combined active dehumidification equipment comprises the following steps:
In the moisture absorption process, determining total water absorption according to the air state before and after dehumidification and the total air to be dehumidified, and then determining the required quality of the drying strips according to the moisture absorption characteristics of the drying strips and the operation requirements in the dehumidification process;
In the desorption regeneration process, the thermal power which needs to be provided by the thermal medium and the heating wire respectively is determined according to the thermal power required by the regeneration of the drying strips and the energy provided by the thermal medium, the mechanism of thermal convection and thermal conduction is considered to obtain the air flow, and the radiation heat transfer mechanism and the efficiency of the heating wire are considered to obtain the electric power and the length of the heating wire.
As a preferred embodiment, the method for determining the total water absorption amount according to the air state before and after dehumidification and the total air amount to be dehumidified during the moisture absorption process, and then determining the required mass of the drying bar according to the moisture absorption characteristics of the drying bar and the operation requirement during the dehumidification process comprises the following steps:
acquiring the temperature T 1 and the humidity of air before dehumidification Pressure p 1, air temperature T 2 required to be reached after dehumidification, humidityThe pressure p 2, the saturated steam pressure E 1、E2 of the air before and after dehumidification is obtained according to the thermophysical properties of the humid air;
the partial pressure p s1、ps2 of water vapor in the air before and after dehumidification is calculated as follows:
the total mass of air to be dehumidified is m, and the total water absorption W tot of the drying bar is calculated according to the following formula:
According to the water absorption W ta of the unit mass drying strips, the allowable total time t for completing the dehumidification requirement, the allowable regeneration times n and the ratio k of the moisture absorption time to the desorption time of the drying strips, the consumption m d of the drying strips is calculated according to the following formula:
As a preferred solution, in the desorption regeneration process, the thermal power to be provided by the thermal medium and the heating wire is determined according to the thermal power required by the regeneration of the drying strip and the energy provided by the thermal medium, the mechanism of thermal convection and thermal conduction is considered to obtain the air flow, and the radiation heat transfer mechanism and the efficiency of the heating wire are considered to obtain the electric power and the length of the heating wire, which comprises the following steps:
The thermal power P re required for regeneration of the drying strip and the thermal power P 1 provided by the thermal medium are determined, and the thermal power P 2 provided by the heating wire is calculated as follows:
P2＝Pre-P1；
According to the temperature of the drying strip being T d, the heat exchange area A d of the drying strip and the air and the convection heat exchange coefficient h d of the drying strip and the air, the temperature T a of the air after heat exchange is calculated according to the following formula:
According to the air temperature T a0 before heat exchange, the air specific heat capacity c a, the heat medium temperature T f, the outer tube length l o, the outer tube inner diameter d oi, the outer tube outer diameter d oo, the surface heat transfer coefficient h i of the heat medium and the outer tube inner wall, the surface heat transfer coefficient h o of the air and the outer tube outer wall and the outer tube heat transfer coefficient lambda, the air flow q a is calculated according to the following formula:
the electric power P e of the heating wire is calculated from the total radiation absorptivity α in of the inner tube to the heating wire, the total radiation absorptivity α out of the outer tube to the inner tube, the total radiation absorptivity α d of the dry strip to the outer tube, and the ratio η e of the radiant power to the electric power of the heating wire as follows:
Based on the emissivity epsilon w of the heating wire, the heating wire temperature T w, the heating wire diameter d w, and the blackbody radiation constant sigma, the length l w of the heating wire is calculated as follows:
where the value of the blackbody radiation constant σ is 5.67×10 -8W·m-2·K-4.
Compared with the prior art, the invention has at least the following beneficial effects:
The renewable hollow dehumidifying pipe utilizes the drying strip made of the hygroscopic salt composite material to realize water absorption, water transportation and water storage, and the water absorption process of the drying strip does not consume energy. During the moisture absorption process, air continuously flows through the drying strips, the surfaces of the drying strips have continuous water absorption capacity, during the desorption regeneration process, the outside provides energy to enable the temperature of the drying strips to rise, the moisture continuously moves from the inside of the drying strips to the surfaces and is released, and the moisture is taken away by the flowing air, so that the drying strips have the capacity of re-absorbing moisture. The desorption regeneration process can utilize various waste heat as a heat medium, ensure good dehumidification performance, reduce energy input in the dehumidification process and improve energy utilization rate. When the energy provided by the waste heat medium can not meet the desorption and regeneration requirements of the drying strips, the heating wire can be used for auxiliary heating. The combined active dehumidification device adopts a modularized structure, all parts can be manufactured separately, and the combined active dehumidification device can be assembled into dehumidification devices with different scales and forms according to specific dehumidification requirements and operation environments, and is flexible in use form and strong in universality.
Furthermore, the invention takes the hygroscopic salt composite material as the adsorbent to finish dehumidification above the dew point, and the high-porosity hydrophilic matrix in the hygroscopic salt composite material has the characteristics of large water absorption capacity and no water leakage, and liquid water is not generated in the dehumidification process, so that the temperature application range of dehumidification equipment is enlarged, water collection is not needed, and the problem of pollution or corrosion caused by liquid leakage is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a combined active dehumidification device employing a single row of renewable hollow dehumidification tubes in series connection;
FIG. 2 is a schematic diagram of a combined active dehumidification device employing a dual-row series connection of renewable hollow dehumidification pipes;
FIG. 3 is a schematic diagram of a structure in which a single row of renewable hollow dehumidification pipes are connected in parallel;
FIG. 4 is a schematic view of the structure of a hollow dehumidifying tube (without drying bars) according to an embodiment of the present invention;
FIG. 5 is a front cross-sectional view of a hollow desiccant tube according to an embodiment of the present invention;
FIG. 6 is a left side cross-sectional view and partial enlarged view of a hollow desiccant tube according to an embodiment of the present invention;
In the accompanying drawings: 1-a renewable hollow dehumidifying tube; 2-a flow guiding pipe; 3-connecting pipes; 4-connecting the sealing device; 5-positioning plates; 6-drying strips; 7-an inner layer tube; 8-an electric heating wire; 9-an outer layer tube; 10-a bracket; 11-a baffle; 12-capping; 13-an absorbent coating; 14-emissive coating.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1 to 3, an embodiment of the present invention provides a combined active dehumidification device, which includes a renewable hollow dehumidification pipe 1, a flow guide pipe 2, a connecting pipe 3, a connecting sealing device 4 and a positioning plate 5.
The outside of each renewable hollow dehumidification pipe 1 is all around arranging a plurality of drying strips 6, the connection between the renewable hollow dehumidification pipes 1 can be realized through the connecting pipe 3, and the arrangement and the positioning of the pipelines are realized by the positioning plate 5.
The head end of the head renewable hollow dehumidification pipe 1 and the tail end of the tail renewable hollow dehumidification pipe 1 are connected with a flow guide pipe 2.
Air flows through the renewable hollow dehumidification pipe 1 from the outside, and the renewable hollow dehumidification pipe 1 and the flow guide pipe 2 and the renewable hollow dehumidification pipe 1 and the connecting pipe 3 are connected through the connecting sealing device 4.
The drying strip 6 has the functions of absorbing moisture and storing water, and the renewable hollow dehumidifying pipe 1 has the function of providing energy required by desorption regeneration for the drying strip 6 after the drying strip 6 absorbs moisture to a saturated state, so that the continuous operation of the dehumidifying equipment is ensured.
The structures of the equipment can be manufactured separately, the number of the renewable hollow dehumidification pipes 1 and the number of the renewable hollow dehumidification strips 6 are flexibly selected according to specific dehumidification requirements and running environments, and the renewable hollow dehumidification pipes are assembled into various different forms such as single-row serial connection, double-row serial connection, single-row parallel connection and the like.
Another embodiment of the invention also provides a renewable hollow dehumidifying pipe, which comprises an outer layer pipe 9 and an inner layer pipe 7 nested inside the outer layer pipe 9; the inner layer tube 7 is provided with an electric heating wire 8 which is communicated with the outside through a channel;
The outer layer tube 9 is used for passing through a heat medium, and the outer layer tube 9 is isolated from the inner layer tube 7;
The outside of the outer layer pipe 9 is provided with a plurality of groups of brackets 10, the drying strips 6 are arranged through the brackets 10, air flows through the outside of the outer layer pipe 9, and contact surfaces are formed between the drying strips 6 and the air;
the drying strips 6 are made of a hygroscopic salt composite material;
during the moisture absorption process, air continuously flows through the drying strips 6, and the surfaces of the drying strips 6 have continuous water absorption capacity;
In the desorption regeneration process, a heat medium is introduced into the outer layer pipe 9, and the heat is assisted by the heating wire 8, so that the heat is transferred to the drying strip 6, the temperature of the drying strip 6 is increased, and the moisture moves from the inside of the drying strip 6 to the surface and is released, and is taken away by flowing air, thereby completing the regeneration.
Referring to fig. 4, a plurality of groups of brackets 10 are arranged outside the hollow dehumidifying tube 1, one end of each bracket 10 is provided with a baffle 11, the other end is provided with a detachable sealing cover 12, and the brackets 10 are used for holding the drying strips 6 and simultaneously avoiding shielding the contact surface of the drying strips 6 and air as much as possible. When the dehumidification device is used, the bracket 10, the baffle 11 and the cover 12 jointly play a role of containing the drying strips 6; when the number of regenerations of the drying bar 6 reaches the limit of use, the removable cover 12 is opened and a new drying bar 6 is replaced.
In one possible embodiment, the drying bar 6 is a hygroscopic salt composite material composed of a hygroscopic salt and a high-porosity hydrophilic matrix, the hygroscopic salt is filled in a large amount in the surface layer of the high-porosity hydrophilic matrix, and the hygroscopic salt has an absorption effect on moisture, and the high-porosity hydrophilic group has an absorption effect on moisture. The high porosity characteristics of the matrix enable it to accumulate liquid and hold large amounts of hygroscopic salts. During the moisture absorption process, air continuously flows around the drying bar 6, and moisture absorption salt captures water vapor in the air through absorption and forms a solution, which flows under the capillary force and absorption action of the high-porosity hydrophilic matrix and is stored in the high-porosity hydrophilic matrix, so that the surface of the drying bar 6 has continuous water absorption capacity. During desorption regeneration, the outside provides energy to raise the temperature of the drying bar 6, moisture continuously moves from the inside of the drying bar 6 to the surface and is released, and is carried away by flowing air, and simultaneously, hygroscopic salt also returns to the surface from the inside of the high-porosity hydrophilic matrix, so that the drying bar has the capacity of re-absorbing moisture.
Referring to fig. 5 and 6, the hollow dehumidifying tube 1 adopts a double-layer nested form inside, and comprises an inner layer tube 7 and an outer layer tube 9, wherein an electric heating wire 8 is arranged inside the inner layer tube 7, an absorption coating 13 is arranged on the inner wall of the inner layer tube 7, an emission coating 14 is arranged on the outer wall of the inner layer tube 7, the inner layer tube 7 is communicated with the outside, the outer layer tube 9 is communicated with the flow guide tube 2 or the connecting tube 3 through the connecting sealing device 4, the outer layer tube 9 is used for circulation of a heat medium, and the inner layer tube 7 and the outer layer tube 9 are not communicated so as to avoid damage to the electric heating wire 8 caused by the heat medium or high humidity air.
When the desorption regeneration stage of the drying strip 6 is entered, the waste heat medium is introduced into the outer layer pipe 9, the waste heat medium exchanges heat with air through the outer layer pipe 9, the air transfers heat to the drying strip 6, the drying strip 6 heats up, and the internal solution desorbs and releases moisture.
When the energy provided by the waste heat medium can not meet the desorption and regeneration requirements of the drying strip 6, the heating wire 8 is used for auxiliary heating, the main mode of heat transfer from the heating wire 8 to the drying strip 6 is heat radiation, the absorption rate of the inner layer tube to the radiation emitted by the heating wire 8 and the radiation emissivity of the inner layer tube to the outer layer tube are improved through the absorption coating 13 and the emission coating 14, and the dissipation of the energy is reduced.
The embodiment of the invention also provides a design method of the combined active dehumidification equipment, which comprises the following steps:
in the moisture absorption process, determining the total water absorption according to the air state before and after dehumidification and the total air to be dehumidified, and then determining the required mass of the drying strips 6 according to the moisture absorption characteristics of the drying strips 6 and the operation requirements in the dehumidification process;
In the desorption regeneration process, the thermal power to be provided by the thermal medium and the heating wire 8 is determined according to the thermal power required by the regeneration of the drying strip 6 and the energy provided by the thermal medium, the mechanism of thermal convection and thermal conduction is considered to obtain the air flow, and the radiation heat transfer mechanism and the efficiency of the heating wire 8 are considered to obtain the electric power and the length of the heating wire 8.
Further, determining the total water absorption amount according to the air state before and after dehumidification and the total amount of air to be dehumidified, and then determining the required mass of the drying bar 6 according to the moisture absorption characteristics of the drying bar 6 and the operation requirements during dehumidification includes the steps of:
acquiring the temperature T 1 and the humidity of air before dehumidification Pressure p 1, air temperature T 2 required to be reached after dehumidification, humidityThe pressure p 2, the saturated steam pressure E 1、E2 of the air before and after dehumidification is obtained according to the thermophysical properties of the humid air;
the partial pressure p s1、ps2 of water vapor in the air before and after dehumidification is calculated as follows:
The total mass of air to be dehumidified is obtained as m, and the total water absorption W tot of the drying bar 6 is calculated as follows:
According to the water absorption W ta of the unit mass drying strip 6, the allowable total time t for completing the dehumidification requirement, the allowable regeneration times n and the ratio k of the moisture absorption time and the desorption time of the drying strip 6, the consumption m d of the drying strip 6 is calculated according to the following formula:
Further, determining the thermal power to be provided by the thermal medium and the heating wire 8 according to the thermal power required for regenerating the drying strip 6 and the energy provided by the thermal medium, taking the mechanism of thermal convection and thermal conduction into consideration to obtain the air flow, and taking the radiation heat transfer mechanism and the efficiency of the heating wire 8 into consideration to obtain the electric power and length of the heating wire 8 comprises the following steps:
The thermal power P re required for regeneration of the drying strip 6 and the thermal power P 1 provided by the thermal medium are determined, and the thermal power P 2 provided by the heating wire 8 is calculated as follows:
P2＝Pre-P1；
According to the temperature of the drying strip 6 being T d, the heat exchange area A d of the drying strip 6 and the air, and the convection heat exchange coefficient h d of the drying strip 6 and the air, the temperature T a of the air after heat exchange is calculated according to the following formula:
The air flow rate q a is calculated according to the air temperature T a0 before heat exchange, the air specific heat capacity c a, the heat medium temperature T f, the length l o of the outer tube 9, the inner diameter d oi of the outer tube 9, the outer diameter d oo of the outer tube 9, the surface heat transfer coefficient h i of the heat medium and the inner wall of the outer tube 9, the surface heat transfer coefficient h o of the air and the outer wall of the outer tube 9, and the heat transfer coefficient λ of the outer tube 9, as follows:
From the total radiation absorptivity α in of the inner tube 7 to the heating wire 8, the total radiation absorptivity α out of the outer tube 9 to the inner tube 7, the total radiation absorptivity α d of the dry strip 6 to the outer tube 9, and the ratio η e of the radiation power to the electric power of the heating wire 8, the electric power P e of the heating wire 8 is calculated as follows:
Based on emissivity ε w of heating wire 8, temperature T w of heating wire 8, diameter d w of heating wire 8, and blackbody radiation constant σ, length l w of heating wire 8 is calculated as follows:
where the value of the blackbody radiation constant σ is 5.67×10 -8W·m-2·K-4.
In the specific working process of the combined active dehumidification device provided by the embodiment of the invention, in the dehumidification stage, the air to be dehumidified flows through the drying strips 6, the moisture absorption salt on the surfaces of the drying strips 6 captures the water vapor in the air through the absorption effect of the moisture absorption salt, and the formed solution moves to the inside of the drying strips 6 under the capillary force effect of the high-porosity hydrophilic matrix and is stored in the inside of the drying strips 6 through the absorption effect of the high-porosity hydrophilic matrix. After the drying strips 6 absorb moisture to a preset degree, the drying strips enter a desorption regeneration stage, the waste heat medium flows through the outer layer tube 9 of the renewable hollow dehumidification tube 1, and the waste heat medium transfers heat to the drying strips 6, so that the adsorbent desorbs and releases moisture. When the waste heat medium cannot supply enough energy, the heating wire 8 is used to assist heating. In the desorption regeneration stage, the air flowing from the outside of the hollow dehumidification pipe 1 is led to the outdoor or other places without humidity control requirements. After the desorption regeneration stage is finished, the drying strip 6is restored to the initial state, and can enter a dehumidification stage, so that the cycle is performed, and continuous dehumidification of the indoor environment is realized.
The foregoing description of the preferred embodiment of the present invention is not intended to limit the technical solution of the present invention in any way, and it should be understood that the technical solution can be modified and replaced in several ways without departing from the spirit and principle of the present invention, and these modifications and substitutions are also included in the scope of protection covered by the claims.
Claims (10)
1. A renewable hollow dehumidifying tube, characterized in that: comprises an outer layer pipe (9) and an inner layer pipe (7) nested inside the outer layer pipe (9); an electric heating wire (8) is arranged in the inner layer tube (7) and is communicated with the outside through a channel;
the outer layer pipe (9) is used for passing through a thermal medium, and the outer layer pipe (9) is isolated from the inner layer pipe (7);
The outside of the outer layer pipe (9) is provided with a plurality of groups of brackets (10), the drying strips (6) are arranged through the brackets (10), air flows through the outside of the outer layer pipe (9), and a contact surface is formed between the drying strips (6) and the air;
the drying strip (6) is made of a hygroscopic salt composite material;
during the moisture absorption process, air continuously flows through the drying strips (6), and the surfaces of the drying strips (6) have continuous water absorption capacity;
In the desorption regeneration process, a heat medium is introduced into the outer layer pipe (9), and the heat is assisted by combining with the electric heating wire (8) for heating, so that the heat is transferred to the drying strip (6), the temperature of the drying strip (6) is increased, and the moisture moves from the inside of the drying strip (6) to the surface and is released, and is taken away by flowing air, so that the regeneration is completed.
2. The regenerable hollow desiccant tube of claim 1, wherein: an absorption coating (13) is arranged on the inner wall of the inner layer pipe (7), and an emission coating (14) is arranged on the outer wall of the inner layer pipe (7).
3. The regenerable hollow desiccant tube of claim 1, wherein: the hygroscopic salt composite material consists of hygroscopic salt and a high-porosity hydrophilic matrix, wherein the hygroscopic salt is filled in the surface layer of the high-porosity hydrophilic matrix, the hygroscopic salt has an absorption effect on moisture, and the high-porosity hydrophilic group has an absorption effect on moisture, so that liquid can be accumulated.
4. The regenerable hollow desiccant tube of claim 1, wherein: one end of the support (10) is provided with a baffle (11), the other end of the support is provided with a detachable sealing cover (12), the drying strip (6) is assembled through the support (10), the baffle (11) and the sealing cover (12), and when the regeneration times of the drying strip (6) reach the use limit, the sealing cover (12) is opened for replacement.
5. A combined active dehumidification device, characterized by comprising a renewable hollow dehumidification tube (1) according to any one of claims 1 to 4 and a draft tube (2), a connecting tube (3) and a positioning plate (5);
The connecting pipes (3) are used for connecting the plurality of renewable hollow dehumidification pipes (1);
The positioning plate (5) is used for arranging and positioning a plurality of renewable hollow dehumidification pipes (1) which are connected together;
the head end of the head renewable hollow dehumidification pipe (1) and the tail end of the tail renewable hollow dehumidification pipe (1) are connected with a guide pipe (2);
air flows through the outside of the renewable hollow dehumidification pipe (1), and active dehumidification is completed by the drying strips (6);
After the drying strip (6) absorbs moisture to a saturated state, the desorption regeneration process is carried out outside a humidity control place; heating the drying strip (6) by introducing a heat medium into the outer layer pipe (9), and desorbing moisture from the drying strip (6) to realize regeneration; when the energy provided by the heat medium can not meet the requirement of the drying strip (6) for desorbing the moisture, the heating wire (8) is used for auxiliary heating.
6. The combined active dehumidification device according to claim 5, wherein the renewable hollow dehumidification tube (1) and the flow guide tube (2) and the connecting tube (3) are connected through a connecting sealing device (4).
7. The combined active dehumidification device according to claim 5, wherein the arrangement of the plurality of renewable hollow dehumidification tubes (1) comprises any one of single-row series connection, double-row series connection, single-row parallel connection.
8. A method of designing a combined active dehumidification plant as claimed in any one of claims 5 to 7, comprising the steps of:
In the moisture absorption process, determining the total water absorption according to the air state before and after dehumidification and the total air to be dehumidified, and then determining the required mass of the drying strips (6) according to the moisture absorption characteristics of the drying strips (6) and the operation requirements in the dehumidification process;
In the desorption regeneration process, the thermal power which is required by the regeneration of the drying strip (6) and the thermal power which can be provided by the thermal medium are determined, the thermal power which is required by the thermal medium and the thermal power which is required by the heating wire (8) are respectively provided, the mechanism of thermal convection and the mechanism of thermal conduction are considered to obtain the air flow, and the radiation heat transfer mechanism and the efficiency of the heating wire (8) are considered to obtain the electric power and the length of the heating wire (8).
9. The design method according to claim 8, wherein the determining of the total water absorption amount in the moisture absorption process according to the air state before and after dehumidification and the total amount of air to be dehumidified, and then determining the required mass of the drying bar (6) according to the moisture absorption characteristics of the drying bar (6) and the operation requirements in the dehumidification process comprises the steps of:
acquiring the temperature T 1 and the humidity of air before dehumidification Pressure p 1, air temperature T 2 required to be reached after dehumidification, humidityThe pressure p 2, the saturated steam pressure E 1、E2 of the air before and after dehumidification is obtained according to the thermophysical properties of the humid air;
the partial pressure p s1、ps2 of water vapor in the air before and after dehumidification is calculated as follows:
The total mass of the air to be dehumidified is m, and the total water absorption W tot of the drying bar (6) is calculated according to the following formula:
According to the water absorption W ta of the unit mass drying strip (6), the allowable total time t for completing the dehumidification requirement, the allowable regeneration times n and the ratio k of the moisture absorption time and the desorption time of the drying strip (6), the consumption m d of the drying strip (6) is calculated according to the following formula:
10. The design method according to claim 8, wherein the determining the thermal power to be supplied by the thermal medium and the heating wire (8) respectively according to the thermal power required for regenerating the drying strip (6) and the energy supplied by the thermal medium, taking into account the mechanism of thermal convection and thermal conduction to obtain the air flow, and taking into account the radiation heat transfer mechanism and the efficiency of the heating wire (8) to obtain the electric power and length of the heating wire (8) during the desorption regeneration comprises the steps of:
The thermal power P re required for regeneration of the drying bar (6) and the thermal power P 1 provided by the thermal medium are determined, and the thermal power P 2 provided by the heating wire (8) is calculated as follows:
P2＝Pre-P1；
According to the temperature of the drying strip (6) being T d, the heat exchange area A d of the drying strip (6) and the air and the convection heat exchange coefficient h d of the drying strip (6) and the air, the temperature T a of the air after heat exchange is calculated according to the following formula:
According to the air temperature T a0 before heat exchange, the air specific heat capacity c a, the heat medium temperature T f, the length l o of the outer tube (9), the inner diameter d oi of the outer tube (9), the outer diameter d oo of the outer tube (9), the surface heat transfer coefficient h i of the heat medium and the inner wall of the outer tube (9), the surface heat transfer coefficient h o of the air and the outer wall of the outer tube (9) and the heat transfer coefficient lambda of the outer tube (9), the air flow q a is calculated as follows:
according to the total radiation absorptivity alpha in of the inner layer tube (7) to the heating wire (8), the total radiation absorptivity alpha out of the outer layer tube (9) to the inner layer tube (7), the total radiation absorptivity alpha d of the drying strip (6) to the outer layer tube (9) and the ratio eta e of the radiation power to the electric power of the heating wire (8), the electric power P e of the heating wire (8) is calculated according to the following formula:
Based on emissivity ε w of the heating wire (8), temperature T w of the heating wire (8), diameter d w of the heating wire (8), and blackbody radiation constant σ, length l w of the heating wire (8) is calculated as follows:
where the value of the blackbody radiation constant σ is 5.67×10 -8W·m-2·K-4.
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| CN202410378609.6A CN118267836A (en) | 2024-03-29 | 2024-03-29 | Renewable hollow dehumidification pipe, combined active dehumidification equipment and design method |
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