CN111366389B - Moisture-containing dust-containing air flow supply device and control method - Google Patents
Moisture-containing dust-containing air flow supply device and control method Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 130
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- 238000004378 air conditioning Methods 0.000 abstract description 2
- 239000008400 supply water Substances 0.000 abstract description 2
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- 238000002474 experimental method Methods 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a wet dust-containing air flow supply device and a control mode, which relate to the field of performance test of air-conditioning heat exchangers and comprise a test air duct, a fan arranged in the test air duct, a water vapor dispersion module, a dust dispersion module, a fairing, a dust concentration meter, a hygrometer and a PLC (programmable logic controller) control device used for controlling water vapor and dust supply and dispersion concentration and corresponding dust and humidity test instruments. The invention can supply water vapor with specific volume flow according to the relative humidity required in the test space, and uniformly distribute the water vapor in the test space by utilizing the dispersing device; and dust with specific mass can be uniformly dispersed to the test space through the running crawler according to the required dust concentration in the test space. The apparatus can thus provide three modes of operation, including a mode of operation in which only a dusty gas stream is supplied, a mode of operation in which only a humid gas stream is supplied, and a mode of operation in which a humid dusty gas stream is supplied.
Description
Technical Field
The invention relates to the field of performance testing of air-conditioning heat exchangers, in particular to a wet dust-containing air flow supply device and a control method.
Background
The air in the daily life environment of people contains water vapor and dust with certain concentration. When the air conditioner operates in a refrigerating mode, indoor air containing water vapor and dust flows through the heat exchanger, the water vapor in the air flow can be separated out on the surface of the heat exchanger to form condensed water, and the dust in the air flow can be adhered to the surface of the condensed water to form a wet dust layer. In the long-term operation process of the air conditioner, the wet dust deposition layer is thickened continuously, so that the performance of the air conditioner is obviously attenuated. In the development of the air conditioner, the influence of the wet dust deposit layer on the performance attenuation of the air conditioner needs to be known and controlled in advance, and therefore a targeted experimental test needs to be carried out to accelerate and simulate the influence of natural moisture and dust on the performance of the air conditioner. This requires experimental equipment reflecting the influence of the water vapor and dust concentrations, and the key to the equipment is to form a gas flow with controllable water vapor and dust concentrations.
At present, the research of related devices and technologies is available, and the supply of the air flow with controllable water vapor and dust concentration can not be realized. Chinese patent CN108954923A (published 2018.12.07) discloses an accurate powder supply device for accelerated dust deposition test of air conditioner heat exchanger, and the invention only relates to dust supply. Chinese patent CN204460156U (bulletin No. 2015.07.08) discloses a water vapor supply device for burning branch and leaf wood with water injected from above, and the invention only relates to water vapor supply.
Therefore, those skilled in the art have made efforts to develop a device that can simultaneously supply water vapor and dust, and can control the concentrations of water vapor and dust according to experimental needs.
Disclosure of Invention
The invention aims to provide a humidity and dust concentration controllable wet dust-containing airflow supply device and a control method. The technical principle of supplying the wet dusty gas flow is as follows: supplying water vapor with a specific volume flow according to the humidity required in the test space, and uniformly distributing the water vapor in the test space by using a dispersing device; uniformly dispersing dust with specific mass to a test space through an operating crawler according to the required dust concentration in the test space; and then, the water vapor and the dust are fully mixed by using the external air to form the wet dust-containing airflow with uniform and controllable humidity and dust concentration.
In order to achieve the purpose, the invention provides a wet dust-containing air flow supply device which comprises a test air channel, a fan, a heat exchanger sample, a water vapor dispersion module, a dust dispersion module, a fairing, a constant temperature water tank, a dust concentration instrument, a hygrometer and a PLC (programmable logic controller) control device, wherein the test air channel is connected with the fan;
the fan, the heat exchanger sample piece, the water vapor dispersion module and the dust dispersion module are sequentially arranged in the test air channel;
the two cowlings are respectively positioned at an air inlet of the test air channel and in the middle of the test air channel, and the water vapor dispersing module and the dust dispersing module are respectively arranged on two sides of the middle cowling;
the dust concentration meter is arranged on the leeward side of the dust dispersion module;
the hygrometer is arranged on the windward side of the heat exchanger sample piece;
an inlet and an outlet of the heat exchanger sample piece are respectively connected with a water flow inlet and a water flow outlet of the constant temperature water tank, and the constant temperature water tank is positioned at the bottom of the test air duct;
the PLC control device is connected with the water vapor dispersion module, the dust dispersion module, the constant-temperature water tank, the dust concentration meter and the hygrometer.
Further, the steam dispersion module comprises a steam equalizing plate and a steam generating device, the steam inlet and outlet of the steam equalizing plate are connected with the steam generating device, the steam equalizing plate comprises at least one steam dispersion unit, and the steam dispersion units are connected in parallel.
Further, the water vapor dispersion unit comprises a zero-level branch flow channel, a first-level branch flow channel and a second-level branch flow channel, the hydraulic diameter ratio of the zero-level branch flow channel to the first-level branch flow channel is equal to the diameter ratio of the first-level branch flow channel to the second-level branch flow channel, and the hydraulic length ratio of the zero-level branch flow channel to the first-level branch flow channel is equal to the length ratio of the first-level branch flow channel to the second-level branch flow channel.
Further, the water vapor dispersion unit starts from the zero-level branch flow channel, and is in a one-to-three mode at a node, and the angle is 30-75 degrees; the zero-level branch flow channel is divided into three first-level branch flow channels, the middle first-level branch flow channel is divided into three parts, and the three second-level branch flow channels are divided; the three secondary branch runners are combined into one primary branch runner, and the three primary branch runners are combined into one zero-level branch runner.
Further, the water vapor generation device is an ultrasonic water vapor generation device.
Further, the dust dispersion module comprises two dust containers, two tracks, six track shafts and at least one dust sticking belt.
Furthermore, the top and the bottom of the test air duct are respectively provided with a bulge, the inner sides of the joints of the two bulges and the test air duct are respectively provided with a strip-shaped opening, and the dust container is a cubic container with an opening at the upper end and is respectively positioned at the top bulge and the bottom bulge of the test air duct.
Furthermore, the three crawler shafts are arranged in a group to form two inverted triangles, the upper group of crawler shafts are arranged in the dust container at the top of the air duct, the lower group of crawler shafts are arranged in the dust container at the bottom of the air duct, and the crawler belts are respectively sleeved at two ends of the crawler shafts and are connected end to form a closed loop.
Furthermore, the dust sticking belt is made of fabric with a rough surface, and two ends of the dust sticking belt are respectively connected to the caterpillar belts.
The invention provides a control mode of a wet dust-containing gas flow supply device, which is characterized by comprising three working modes:
1) the dust dispersing module is opened, the dust sticking belt rotates to the dust container along with the crawler, the dust sticking belt rotates to the testing air channel after being fully wrapped with dust in the dust container, outside air enters the testing air channel under the driving of the fan and blows the dust on the dust sticking belt, the dust is gradually separated from the dust sticking belt and is mixed with air, and the dust and the air are fully mixed by the bidirectional dust sticking belt rotating at a constant speed and are uniformly distributed in the testing air channel;
2) operating mode with supply of only moisture-containing gas stream: the water vapor dispersing module is opened, the water vapor generating device converts liquid water into water vapor, the water vapor equalizing plate is opened, the water vapor flows along all stages of flow channels of the dispersing units which are distributed in the water vapor equalizing plate in parallel, the water vapor flows to a plurality of uniformly-dispersed outlets, the helical blades at the tail ends of the outlets rotate under the drive of air flow, the water vapor from the outlets is dispersed in all directions at 360 degrees, the uniformly-dispersed water vapor is mixed with air, and water vapor mixed air flow is formed in the test air channel;
3) mode of operation for supplying a wet dusty gas stream: opening the dust dispersion module and the water vapor dispersion module simultaneously, wherein dust is carried by the dust sticking belt and is mixed with air in the test space to form uniform dust-containing airflow; and the water vapor is driven by each dispersing unit and the helical blade to be mixed with the dusty airflow to form the wet dusty airflow.
The invention has the following technical effects:
1) the crawler-type dust dispersing module disperses dust with specific mass in the test air channel, and dust-containing air flows with different concentrations can be formed by adjusting the rotating speed of the crawler, so that the uniformity and stability of the dust concentration are ensured;
2) the even board of steam of specific structure guarantees that steam export homodisperse is in testing the wind channel, and helical blade makes steam flow to all directions, guarantees the homogeneous mixing of steam and air for steam evenly distributed in the air current.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a schematic view of an operating mode for supplying only a dusty gas stream;
FIG. 2 is a schematic view of an operating mode for supplying only a moisture-containing gas stream;
FIG. 3 is a schematic view of an operating mode for supplying a wet dusty gas stream;
FIG. 4 is a water vapor flow diagram of a water vapor equalization plate;
FIG. 5 is a view of the spiral blade at the opening;
FIG. 6 is a block diagram of a vapor dispersion unit;
FIG. 7 is a schematic view of the main body of the dust dispersing apparatus;
FIG. 8 is a schematic view of a dust belt;
FIG. 9 is a schematic view of a fairing;
FIG. 10 is a graph showing the dust concentration at the first test point 8a of the dust concentration at the air inlet side of the heat exchanger as a function of time;
FIG. 11 is a graph showing the change of dust concentration with time at the second test point 8b of the dust concentration at the air inlet side of the heat exchanger
FIG. 12 is a diagram showing the variation of the relative humidity difference between water vapor and water on the two sides of the diagonal line of the air inlet side of the heat exchanger;
FIG. 13 is a graph showing the change of the water vapor concentration of the first test point 9a of the relative humidity at the air inlet side of the heat exchanger with time;
FIG. 14 is a graph showing the change of the water vapor concentration of the second test point 9b of the relative humidity at the air inlet side of the heat exchanger with time;
FIG. 15 is a graph showing the variation of the dust concentration difference at two diagonal points on the air inlet side of the heat exchanger.
Wherein:
the device comprises a test air channel, a 2-dust dispersion module, a 2 a-dust container, a 2 b-crawler, a 2 c-crawler shaft, a 2 d-dust sticking belt, a 3-fairing, a 4-water vapor dispersion module, a 4 a-water vapor equalization plate, a 4 b-water vapor generation device, a 5-heat exchanger sample, a 6-constant temperature water tank, a 7-fan, an 8-dust concentration instrument, an 8 a-dust concentration first test point, an 8 b-dust concentration second test point, a 9-hygrometer, a 9 a-relative humidity first test point, a 9 b-relative humidity second test point and a 10-PLC control device.
Detailed Description
The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.
In this example, the dust concentration was set to 0.15g/m3The fluctuation range of the dust concentration is +/-0.02 g/m3The relative humidity is 75%, the fluctuation range is +/-10%, and the dust deposition accelerating time is 8 hours.
In this example, the design of the wet dusty gas stream supply apparatus is shown in FIGS. 1-3. The main body of the test air duct 1 is a rectangular pipe with a square section, the length is 4m, the width is 0.8m, the height is 0.8m, and the test air duct can be built by an aluminum alloy frame and a plastic plate or a wood plate.
The water vapor dispersion module 4 consists of a water vapor equalizing plate 4a and a water vapor generating device 4 b; the water vapor equalizing plate 4a comprises at least one water vapor dispersing unit, as shown in fig. 6, the water vapor dispersing units are connected in parallel, the dispersing unit comprises a zero-order branch flow channel, a first-order branch flow channel and a second-order branch flow channel, the hydraulic diameter ratio of the zero-order branch flow channel and the first-order branch flow channel is equal to the diameter ratio of the first-order branch flow channel and the second-order branch flow channel, and D0/D1＝D1/D2γ is 1.5. The hydraulic length ratio of the zero-level branch flow passage to the first-level branch flow passage is equal to the length ratio of the first-level branch flow passage to the second-level branch flow passage, and the ratio is L0/L1＝L1/L2＝α＝1.2。
The water vapor dispersion unit starts from the zero-level branch flow channel, and is in a one-to-three mode at a node, and the angle is 60 degrees; the zero-level branch flow channel is divided into three first-level branch flow channels, the middle first-level branch flow channel is divided into three parts, three second-level branch flow channels are formed in a fractal mode, the three second-level branch flow channels are combined into a first-level branch flow channel, and the three first-level branch flow channels are combined into a zero-level branch flow channel.
The water vapor equalizing plate 4a is made of metal or plastic.
The water vapor generating device 4b adopts an ultrasonic atomizer with the model number of JW1007S-002, water vapor inlets and outlets of the water vapor equalizing plate 4a are connected with the water vapor generating device 4b, the flow path of the water vapor on the water vapor equalizing plate is shown in the arrow direction in fig. 4, and the tail end of the water vapor outlet is provided with a helical blade, and the structure is shown in fig. 5.
As shown in FIG. 7The dust dispersing module 2 consists of two dust containers 2a, two crawler belts 2b, six crawler belt shafts 2c and at least one dust sticking belt 2 d; the dust container 2a is a hollow cubic or rectangular container with a volume of 0.1m3The material is plastic or wood products; the crawler belt 2b is a strip crawler belt with the length of 2.6m, is connected end to form a closed loop and is made of rubber; the three track shafts 2c are arranged in a group of two isosceles triangles, three sides of the two triangles are 0.5m multiplied by 0.4m, and the closed-loop track 2b is supported into an arrow shape; the dust-sticking belt 2d is made of rough-surfaced hemp fabric, two crawler belts 2b are connected to two ends of the dust-sticking belt respectively, and a schematic diagram of the dust-sticking belt is shown in fig. 8.
As shown in fig. 9, the fairing 3 is composed of 4cm × 4cm plastic grids, and is located at the inlet and the middle of the test air duct 1, and the dust dispersing module 2 and the water vapor dispersing module 4 are respectively arranged on two sides of the middle fairing 3.
The refrigerant inlet and outlet of the heat exchanger sample 5 are respectively connected with the water flow inlet and outlet of the constant temperature water tank 6.
The dust concentration meter 8 is arranged in the test space; the PLC control device 10 is connected with the dust concentration meter 8 and receives a dust concentration signal of a test space.
The PLC control device 10 is connected with the water vapor dispersion module 4, the dust dispersion module 2 and the constant temperature water tank 6, and respectively controls the rotation of the dust dispersion module 2, the flow of the constant temperature water tank 6 and the flow of the water vapor dispersion module 4.
The operation of this embodiment specifically includes the following three operation modes:
1) mode of operation with supply of dusty gas stream only
As shown in fig. 1, the dust scattering module 2 is opened, and the dust sticking belt 2d is rotated with the crawler belt 2b into the dust container 2 a; the dust sticking belt 2d is rotated into the testing air channel 1 after being fully wrapped with dust in the dust container 2 a; according to the required dust concentration and the airflow velocity of 1m/s, the mass flow of the supplied dust is 0.6 g/min; the external air enters the testing air channel 1 under the driving of the fan 7 and blows dust on the dust sticking belt 2 d; the dust gradually leaves the dust sticking belt 2d and is mixed with the air; the two-way dust sticking belt 2d rotating at a constant speed enables dust and air to be fully mixed and uniformly distributed in the test air channel 1.
The dust carrying amount of the dust belts 2d per time is 0.5g, the rotation speed v of the rotating shaft is 0.2m/s, and the interval between the dust belts 2d is 0.2m, so that the mass flow rate of the dust supply is Q m/(L/v). Wind speed vf1.2m/s, the width and height w of the test tunnel 1 is 0.8m and h is 0.8m, and the dust concentration in the supplied air stream is ρ m/(ν m)f·w·h)＝m·ν/(L·νf·w·h)＝0.16g/m3。
2) Mode of operation with supply of moisture-containing gas stream only
As shown in fig. 2, the water vapor dispersion module 4 is opened, and the ultrasonic water vapor generation device converts liquid water into water vapor; opening the water vapor equalizing plate 4a, wherein water vapor flows along each stage of flow channels of the dispersing units arranged in parallel in the water vapor equalizing plate 4a, and the flow direction of the water vapor is as the arrow direction in fig. 4; the flow rate of the supplied water vapor was 50g/min depending on the desired water vapor concentration and the flow rate of the gas stream of 1 m/s. The water vapor flows to a plurality of uniformly distributed outlets, and the helical blades at the tail ends of the outlets rotate under the drive of the air flow to disperse the water vapor from the outlets in all directions at 360 degrees; the uniformly dispersed water vapor is mixed with air to form water vapor mixed airflow in the test air channel 1.
The supply flow rate of water vapor is Qw50g/min, wind speed vfThe width and height w of the test tunnel 1 is 0.8m and h is 0.8m at 1.2m/s, and the mass concentration of water vapor in the supplied air stream is ρw＝Qw/(vf·w·h)＝1g/m3And further adjusting the air flow to 75% according to the humidity of the test condition.
3) Mode of operation for supplying a humid dusty gas stream
As shown in fig. 3, the dust dispersing module 2 and the water vapor dispersing module 4 are opened simultaneously, and the dust is carried by the dust sticking belt 2d and mixed with the air in the test space to form a uniform dust-containing airflow; the water vapor is driven by each dispersion unit and the helical blade to be mixed with the dusty airflow to form wet dusty airflow.
Cold water with a specific temperature is input into a heat exchanger sample 5, and the dust-water vapor mixed airflow passes through the heat exchanger sample 5 under the driving of a fan 7; the water vapor in the air flow meets the cooled heat exchanger fins and is condensed into water drops on the surfaces of the fins; after dust in the airflow touches fins of the heat exchanger, part of the dust is deposited on the surfaces of the fins; along with the continuation of the dust deposition process, water drops condensed on the surface of the fin gradually increase and are polymerized into a water film; the dust in the air flow contacts with the water film on the surface of the fin to form slurry which is attached to the surface of the fin of the heat exchanger sample 5.
The test results obtained in the examples of the present invention were analyzed as follows:
1) the concentration conditions of two measuring points of a diagonal line on the air inlet side of the heat exchanger are monitored by using a dust concentration meter 8 (figures 10 and 11), and the fluctuation range of the dust concentration is 130-160 mg/m when the rotating speed of a crawler is 0.2m/s3(ii) a When the rotating speed of the crawler belt is 0.15m/s, the fluctuation range of the dust concentration is 80-115 mg/m3All satisfy +/-20 mg/m3The requirement (2) indicates that the dust concentration stability is good. According to the change of the concentration difference of two measuring points on the diagonal of the air inlet side of the heat exchanger (figure 12), the fluctuation range is-10 to 10mg/m3The difference of the dust concentration at different positions is smaller, which shows that the uniformity of the dust concentration is better.
2) The relative humidity conditions of two measuring points of a diagonal line on the air inlet side of the heat exchanger are monitored by using a hygrometer 9 (figures 13 and 14), and it can be seen that when the mass flow of water vapor is 1g/min, the fluctuation range of the relative humidity is 65-80%; when the mass flow of the water vapor is 0.75g/min, the fluctuation range of the relative humidity is 40-60%, the fluctuation requirement of 20% is met, and the stability of the relative humidity is better. According to the change condition of the concentration difference value of two measuring points on the diagonal line of the air inlet side of the heat exchanger (figure 15), the fluctuation range is-10%, the difference of the relative humidity at different positions is smaller, and the uniformity of the relative humidity is better.
In summary, the wet dusty airflow supply device of the invention can not only independently control the supply of dust or the supply of water vapor, but also simultaneously supply dust and water vapor, can control the concentration of the dust and the water vapor, ensure the uniformity and the stability of the dust and the water vapor, and set relevant parameters according to the test requirements to simulate the natural environment.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (7)
1. A supply of a wet dusty gas stream comprising: the device comprises a test air duct, a fan, a heat exchanger sample, a water vapor dispersion module, a dust dispersion module, a fairing, a constant temperature water tank, a dust concentration instrument, a hygrometer and a PLC control device;
the steam dispersing module consists of a steam equalizing plate and a steam generating device, a steam inlet of the steam equalizing plate is connected with the steam generating device, the steam equalizing plate comprises at least one steam dispersing unit, the steam dispersing units are connected in parallel, and the tail end of a steam outlet of the steam equalizing plate is provided with a helical blade;
the dust dispersing module consists of two dust containers, two tracks, six track shafts and at least one dust sticking belt, the track shafts are arranged into two inverted triangles in a group of three, the track shafts of the upper group are arranged in the dust containers at the tops of the air channels, the track shafts of the lower group are arranged in the dust containers at the bottoms of the air channels, the tracks are respectively sleeved at two ends of the track shafts, and the track shafts are connected end to form a closed loop;
the fan, the heat exchanger sample piece, the water vapor dispersion module and the dust dispersion module are sequentially arranged in the test air channel;
the two cowlings are respectively positioned at an air inlet of the test air channel and in the middle of the test air channel, and the water vapor dispersing module and the dust dispersing module are respectively arranged on two sides of the middle cowling;
the dust concentration meter is arranged on the leeward side of the dust dispersion module;
the hygrometer is arranged on the windward side of the heat exchanger sample piece;
an inlet and an outlet of the heat exchanger sample piece are respectively connected with a water flow inlet and a water flow outlet of the constant temperature water tank, and the constant temperature water tank is positioned at the bottom of the test air duct;
the PLC control device is connected with the water vapor dispersion module, the dust dispersion module, the constant-temperature water tank, the dust concentration instrument and the hygrometer.
2. The wet dusty gas stream supply apparatus of claim 1, wherein the water vapor dispersing unit comprises a zero-order bypass flow channel, a first-order bypass flow channel, and a second-order bypass flow channel, wherein the ratio of the hydraulic diameters of the zero-order bypass flow channel and the first-order bypass flow channel is equal to the ratio of the hydraulic diameters of the first-order bypass flow channel and the second-order bypass flow channel, and wherein the ratio of the lengths of the zero-order bypass flow channel and the first-order bypass flow channel is equal to the ratio of the lengths of the first-order bypass flow channel and the second-order bypass.
3. The wet dusty gas-containing stream supply apparatus of claim 2, wherein the vapor dispersion cell begins at the zero-level branch flow path in a one-to-three pattern at a junction; the zero-level branch flow channel is divided into three first-level branch flow channels, the middle first-level branch flow channel is divided into three second-level branch flow channels; the three secondary branch runners are combined into one primary branch runner, and the three primary branch runners are combined into one zero-level branch runner.
4. The wet dusty gas stream supply of claim 1, wherein the moisture generating device is an ultrasonic moisture generating device.
5. The wet dusty gas flow supplying device of claim 1, wherein the top and bottom of the test air duct each have a protrusion, the two protrusions have an elongated opening on the inner side of the connection with the test air duct, and the dust container is a cubic container with an open upper end and is located at the top protrusion and the bottom protrusion of the test air duct, respectively.
6. A wet dusty gas stream supply apparatus as claimed in claim 1 wherein the dust belt is made of a rough-surfaced fabric and is attached at each end to the belt.
7. A method of controlling a supply of a wet dusty gas stream as claimed in any one of claims 1 to 6, comprising three modes of operation:
1) the dust dispersing module is opened, the dust sticking belt rotates to the dust container along with the crawler, the dust sticking belt rotates to the testing air channel after being fully wrapped with dust in the dust container, outside air enters the testing air channel under the driving of the fan and blows the dust on the dust sticking belt, the dust is gradually separated from the dust sticking belt and is mixed with air, and the dust and the air are fully mixed by the bidirectional dust sticking belt rotating at a constant speed and are uniformly distributed in the testing air channel;
2) operating mode with supply of only moisture-containing gas stream: the water vapor dispersing module is opened, the water vapor generating device converts liquid water into water vapor, the water vapor equalizing plate is opened, the water vapor flows along all stages of flow channels of the dispersing units which are distributed in the water vapor equalizing plate in parallel, the water vapor flows to a plurality of uniformly-dispersed outlets, the helical blades at the tail ends of the outlets rotate under the drive of air flow, the water vapor from the outlets is dispersed in all directions at 360 degrees, the uniformly-dispersed water vapor is mixed with air, and water vapor mixed air flow is formed in the test air channel;
3) mode of operation for supplying a wet dusty gas stream: and simultaneously opening the dust dispersion module and the water vapor dispersion module, carrying dust by the dust sticking belt, mixing the dust with air in the test space to form uniform dust-containing airflow, and mixing the water vapor with the dust-containing airflow under the driving of the dispersion units and the helical blades to form wet dust-containing airflow.
Priority Applications (1)
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