Composite VOCs pollutant loading device

Abstract

The present disclosure provides a composite VOCs pollutant loading device, characterized in that it includes: a VOCs generating unit, used to output a VOCs gas source, including a multi-channel VOCs liquid generating unit, a first carrier gas source unit and a first generator, wherein the first generator is connected to the multi-channel VOCs liquid generating unit and the first carrier gas source unit; a formaldehyde generating unit, used to output a formaldehyde gas source, including a methanol solution generating unit, a second carrier gas source unit, a second generator and a catalyst pack, wherein the second generator is connected to the methanol solution generating unit, the second carrier gas source unit, the second generator and the catalyst pack, wherein the catalyst pack is used to convert methanol gas into formaldehyde gas through thermal decomposition of paraformaldehyde; and a mixed output unit, used to output composite VOCs pollutants, respectively connected to the first generator of the VOCs generating unit and the catalyst pack of the formaldehyde generating unit.

Description

Technical Field

[0001] The present disclosure relates to the field of environmental testing, and in particular to a composite VOCs pollutant loading device. Background Art

[0002] In the performance test of air purifiers, artificial methods are needed to generate VOCs pollutants and load them into the test chamber. The air purifier's purification ability and lifespan for VOCs are evaluated by purifying the loaded pollutants.

[0003] The current mainstream performance test mainly uses a single VOC such as toluene as a pollution source. However, in real work and life scenarios, the pollution source is often complex, that is, a mixture of multiple VOCs. These VOCs pollutants may affect the purification efficiency of the air purifier on them (due to competitive adsorption or material poisoning, etc.), so there is a certain risk in characterizing the purification of complex pollutants by loading a single VOCs pollution source.

[0004] Common composite indoor VOCs pollutants include formaldehyde, toluene, styrene, butyl acetate, etc. In order to be closer to the actual pollution concentration, it is necessary to load continuously and stably at a rate of tens of mg / h during the test. The current mainstream single-component pollutant loading methods include:

[0005] (1) Drop evaporation method: The method uses a syringe to drop the solution onto a heating plate for quantitative evaporation. This method has the advantage of accurate total amount, but has the disadvantages of difficult control of loading rate and large concentration fluctuations.

[0006] (2) Bubble method / diffusion method. This method allows VOCs liquid to volatilize naturally or forcefully to form gaseous VOCs, which are then loaded through a carrier gas. The disadvantages are large fluctuations and low total amount control accuracy. In addition, due to the different saturated vapor pressures of different VOCs components, the volatilization ratio and solution ratio of the low-boiling point component and the high-boiling point component may be very different.

[0007] (3) Mixed standard gas method. The mixed standard gas of multi-component VOCs is prepared by gas cylinders and loaded by precision flow meters. Its advantages are simple use, good loading accuracy, continuity and stability in a short time. Its disadvantages are that the composite VOCs standard gas in the required concentration range is not easy to prepare, the price is too high and the storage time is short.

[0008] It can be seen that the existing single-component pollutant loading methods and devices are not capable of meeting the requirements of continuous and stable generation and loading of complex VOCs. And among VOCs pollutants, the loading of formaldehyde is very different from that of other VOCs. Formaldehyde is very active and difficult to store. If a solution such as formalin with a stabilizer (usually methanol) is used for generation, more impurities will be introduced. If methods such as thermal cracking of polyformaldehyde are used, there is a problem of difficulty in controlling the loading rate. Summary of the invention

[0009] 1. Technical issues to be resolved

[0010] The present disclosure provides a composite VOCs pollutant loading device to at least partially solve the technical problems raised above.

[0011] (II) Technical solution

[0012] According to one aspect of the present disclosure, a composite VOCs pollutant loading device is provided, comprising:

[0013] A VOCs generating unit, used for outputting a VOCs gas source, comprising a multi-channel VOCs liquid generating unit, a first carrier gas source unit and a first generator, wherein the first generator is connected to the multi-channel VOCs liquid generating unit and the first carrier gas source unit;

[0014] A formaldehyde generating unit, used for outputting a formaldehyde gas source, comprising a methanol solution generating unit, a second carrier gas source unit, a second generator and a catalyst pack, wherein the second generator is connected to the methanol solution generating unit, the second carrier gas source unit, the second generator and the catalyst pack, wherein the catalyst pack is used for converting methanol gas into formaldehyde gas by thermal cracking of paraformaldehyde; and

[0015] The mixed output unit is used to output complex VOCs pollutants and is respectively connected to the first generator of the VOCs generating unit and the catalytic package of the formaldehyde generating unit.

[0016] According to an embodiment of the present disclosure, the first generator comprises:

[0017] a first evaporation layer, connected to the multi-channel VOCs liquid generating unit, for realizing evaporation of the multi-channel VOCs liquid; and

[0018] The first mixing layer is connected to the first carrier gas source unit and is used for preheating and mixing the evaporated VOCs gas and the carrier gas.

[0019] According to an embodiment of the present disclosure, the first evaporation layer and the first mixed layer are micro-nanoscale porous media with capillary structures.

[0020] According to an embodiment of the present disclosure, the first evaporation layer has a plurality of evaporation blocks for heating the VOCs liquid.

[0021] According to an embodiment of the present disclosure, the VOCs liquid generating unit includes:

[0022] Liquid VOCs unit, used to transport liquid VOCs; and

[0023] A constant flow pump is connected to the liquid VOCs unit and is used to control the flow rate of the liquid VOCs.

[0024] According to an embodiment of the present disclosure, the second generator comprises:

[0025] a second evaporation layer, connected to the methanol solution generating unit, for evaporating the methanol solution; and

[0026] The second mixing layer is connected to the second carrier gas source unit and is used for preheating and mixing the evaporated methanol gas and the carrier gas.

[0027] According to an embodiment of the present disclosure, the second evaporation layer and the second mixed layer are micro-nanoscale porous media with capillary structures.

[0028] According to an embodiment of the present disclosure, the second evaporation layer has a plurality of evaporation blocks for heating the methanol solution.

[0029] According to an embodiment of the present disclosure, the methanol solution generating unit comprises:

[0030] A methanol solution unit for conveying methanol solution; and

[0031] A constant flow pump is connected to the methanol solution unit and is used to control the flow rate of the methanol solution.

[0032] According to an embodiment of the present disclosure, the first carrier gas source unit includes a first carrier gas inlet, a first mass flow meter and a first one-way valve connected in sequence; and / or

[0033] The second carrier gas source unit includes a second carrier gas inlet, a second mass flow meter, and a second one-way valve which are connected in sequence.

[0034] (III) Beneficial effects

[0035] It can be seen from the above technical solution that the composite VOCs pollutant loading device disclosed in the present invention has at least one of the following beneficial effects:

[0036] (1) Compared with loading a single VOCs pollution source, the composite VOCs pollutant loading device disclosed herein integrates multiple VOCs liquid evaporation blocks into the same generator, thereby achieving the generation of multiple VOCs in one generator;

[0037] (2) Compared with the drip evaporation method, the composite VOCs pollutant loading device disclosed in the present invention suppresses evaporation fluctuations through a capillary evaporation structure, and controls the loading rate through a precision micro pump; Compared with the bubbling method / diffusion method, the composite VOCs pollutant loading device disclosed in the present invention compensates for the evaporation difference caused by different boiling points through a special capillary evaporation structure, realizes the simultaneous evaporation of low-boiling point components and high-boiling point components, and accurately controls the total amount through a precision micro pump; Compared with the mixed standard gas method, the composite VOCs pollutant loading device disclosed in the present invention can emit composite VOCs within a specified concentration range, and it can be used immediately without storage;

[0038] (3) Compared with the generation of formaldehyde through formalin solution, the present invention can generate relatively pure formaldehyde gas; compared with the generation of formaldehyde through thermal decomposition of paraformaldehyde, the present invention can accurately control the loading rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the structure of the composite VOCs pollutant loading device according to an embodiment of the present disclosure.

[0040] Figure 2 It is a schematic diagram of the structure of the first generator of the embodiment of the present disclosure.

[0041] Figure 3a-3f It is a schematic diagram of the arrangement structure of the evaporation mixer according to an embodiment of the present disclosure.

[0042] Figures 4a-4d It is a schematic diagram of the distribution of evaporation blocks in the evaporation mixer according to an embodiment of the present disclosure.

[0043] [Description of the main component symbols of the embodiment of the present disclosure in the accompanying drawings]

[0044] 100-VOCs generating unit; 101-VOCs liquid generating unit; 102-first carrier gas source unit; 103-first generator; 1011-liquid VOCs unit; 1012-liquid VOCs constant flow pump; 1021-first carrier gas inlet; 1022-first mass flow meter; 1023-first one-way valve; 1031-evaporation layer; 1032-mixing layer; 200-formaldehyde generating unit; 201-methanol solution generating unit; 202-second carrier gas source unit; 203-second generator; 2011-methanol solution unit; 2012-methanol solution constant flow pump; 2021-second carrier gas inlet; 2022-second mass flow meter; 2023-second one-way valve; 300-mixing output unit; 301-mixer. DETAILED DESCRIPTION

[0045] The present disclosure provides a composite VOCs pollutant loading device, characterized in that it includes: a VOCs generating unit, used to output a mixed gas containing VOCs, including a multi-channel VOCs liquid generating unit, a first carrier gas source unit and a first generator, wherein the first generator is connected to the multi-channel VOCs liquid generating unit and the first carrier gas source unit; a formaldehyde generating unit, used to output a mixed gas containing formaldehyde, including a methanol solution generating unit, a second carrier gas source unit, a second generator and a catalyst pack, wherein the second generator is connected to the methanol solution generating unit, the second carrier gas source unit, the second generator and the catalyst pack, wherein the catalyst pack is used to convert methanol gas into formaldehyde gas through thermal decomposition of polyformaldehyde; and a mixed output unit, used to output composite VOCs pollutants, respectively connected to the first generator of the VOCs generating unit and the catalyst pack of the formaldehyde generating unit.

[0046] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0047] Certain embodiments of the present disclosure will be described more fully below with reference to the accompanying drawings, some but not all of which will be shown. In fact, the various embodiments of the present disclosure may be implemented in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present disclosure satisfies applicable legal requirements.

[0048] In an exemplary embodiment of the present disclosure, a composite VOCs pollutant loading device is provided.

[0049] Figure 1 Schematic diagram of the structure of the composite VOCs pollutant loading device according to the embodiment of the present disclosure. Figure 1 As shown, the present invention discloses a composite VOCs pollutant loading device including a VOCs generating unit 100 , a formaldehyde generating unit 200 and a mixed output unit 300 .

[0050] The various parts of the composite VOCs pollutant loading device of this embodiment are described in detail below.

[0051] The VOCs generating unit 100 is used to output a VOCs-air mixed gas source, and the VOCs generating unit includes a multi-channel VOCs liquid generating unit 101, a first carrier gas source unit 102, and a first generator 103. Exemplarily, the multiple VOCs liquid generating units 101 include a first liquid generating unit, a second liquid generating unit...an nth liquid generating unit, wherein each VOCs liquid generating unit includes a liquid VOCs unit 1011 and a precision liquid VOCs constant flow pump 1012 connected thereto. The first carrier gas source unit 102 includes a first carrier gas inlet 1021, a first mass flowmeter 1022, and a first one-way valve 1023 connected in sequence.

[0052] The output of the multiple VOCs liquid generating units 101, that is, the outlet of the precision liquid VOCs constant flow pump 1012 is connected to the first inlet of the first generator 103; the output of the first carrier gas source unit 102, that is, the outlet of the first one-way valve 1023 is connected to the second inlet of the first generator 103, and the outlet of the first generator 103 is connected to the mixed output unit 300.

[0053] In the VOCs generating unit 100, air is used as a carrier gas to be measured by the first mass flow meter 1022. At the same time, after multiple channels of liquid VOCs (from the 1st channel to the nth channel) are measured by the precision liquid VOCs constant flow pump 1012, the carrier gas and the liquid VOCs simultaneously enter the first generator 103. Under the real-time matching of the control algorithm, a VOCs gas source with an adjustable concentration is stably output, and the concentration and amount of VOCs generated can be continuously adjusted by the precision liquid VOCs constant flow pump 1012. Among them, the first generator 103 is an evaporation mixer.

[0054] It should be noted that, in the present embodiment, air is used as the carrier gas to be input into the first carrier gas inlet 1021 , and in other embodiments, the carrier gas may also be other gases such as nitrogen N2.

[0055] The formaldehyde generating unit 200 is used to output a formaldehyde-air mixed gas source. The formaldehyde generating unit 200 includes a methanol solution generating unit 201, a second carrier gas source unit 202, a second generator 203 and a catalyst bag 204. The methanol solution generating unit 201 includes a methanol solution unit 2011 and a precision methanol solution constant flow pump 2012 connected thereto. The second carrier gas source unit 202 includes a second carrier gas inlet 2021, a second mass flow meter 2022 and a second one-way valve 2023 connected in sequence. Among them, the second carrier gas inlet 2021 can be obtained by dividing the same carrier gas into two with the first carrier gas inlet 1021. That is, one of the carrier gas sources enters the VOCs generating unit 100, and the other enters the formaldehyde generating unit 200.

[0056] The output of the methanol solution generating unit 200, i.e., the outlet of the precision methanol solution constant flow pump 2012, is connected to the first inlet of the second generator 203; the output of the second carrier gas source 202 unit, i.e., the outlet of the second one-way valve 2023, is connected to the second inlet of the second generator 203, and the outlet of the second generator 203 outputs a methanol-air mixed gas, and is connected to the catalyst bag 204, and the formaldehyde-air mixed gas is output through the catalyst bag 204, and is output to the mixed output unit 300. In the formaldehyde generating unit 200, the process flow is similar to that of VOCs generation, except that the sample liquid is methanol, and the catalyst bag 204 is added after the second generator 203. It should be noted that since the catalytic reaction to generate formaldehyde requires oxygen, air is used as the carrier gas to input the second carrier gas inlet 2021 in this embodiment.

[0057] The mixed output unit 300 includes a mixer 301, a first inlet and a second inlet of the mixer 301 are respectively connected to the VOCs generating unit 100 and the formaldehyde generating unit 200, the composite VOCs generated in the VOCs generating unit 100 and the formaldehyde generated in the formaldehyde generating unit 200 enter the mixer 300, and then the composite VOCs pollutants are output.

[0058] Figure 2 Schematic diagram of the structure of the first generator of the embodiment of the present disclosure. The first generator 103 is an evaporation mixer (hot chamber). The first generator 103 includes two micro-nanoscale porous medium layers, namely, an evaporation layer 1031 and a mixing layer 1032. Among them, the evaporation layer 1031 is connected to the output of multiple VOCs liquid generating units 101, and is responsible for expanding the incoming liquid, that is, the liquid VOCs enter the evaporation layer as a whole, and the evaporation layer 1031 has a capillary structure of porous media, which can divide the entire liquid into multiple small pieces and disperse them to various parts of the evaporation layer. Therefore, the capillary structure of the evaporation layer 1031 contributes to the rapid and stable evaporation of the liquid. The evaporation layer 1031 includes multiple VOCs evaporation blocks 1033, which are used to heat and evaporate multiple VOCs liquids. Exemplarily, each evaporation block 1033 corresponds to the output of a liquid generating unit. The mixing layer 1032 is connected to the carrier gas inlet for preheating and mixing the evaporated VOCs gas and the carrier gas.

[0059] When the VOCs liquid is evenly spread in the capillary structure composed of porous media in the evaporation layer 1031, its evaporation fluctuation can be effectively suppressed, so the evaporation process is continuous and stable. Since multiple VOCs liquids enter at the same time, and the special capillary evaporation structure compensates for the evaporation differences caused by different boiling points, multiple VOCs can be evaporated at the same time; the carrier gas brings out multiple VOCs gases, achieving uniform mixing.

[0060] In addition, the VOCs generating unit 100 of this embodiment can also adjust the type of VOCs gas by changing the type of VOCs liquid; by adjusting the flow rate of various VOCs liquids, the loading speed and concentration of various VOCs in the mixed gas can be linearly controlled.

[0061] The structure of the second generator 203 is similar to that of the first generator 103. The output of the formaldehyde generating unit 200 is connected to the evaporation layer, and the output of the second carrier gas source unit is connected to the mixing layer. The methanol solution is evaporated by the second generator 203 to generate a methanol-air mixed gas.

[0062] Then, the methanol vapor enters the catalytic package 204, and the methanol vapor is converted into formaldehyde using a partial catalytic oxidation method, as shown in formula (1). Using an iron-molybdenum catalyst, methanol and air as raw materials, at 290°C, more than 95% of the methanol is converted into formaldehyde through a partial catalytic oxidation reaction, and about 4-5% of the methanol is converted into CO or CO2. Its impurity content is much lower than that of formalin solution. This method has the same uncertainty in the process link as the method of generating formaldehyde by catalytic cracking of polyformaldehyde by the China Institute of Metrology.

[0063]

[0064] By adding the catalyst package 204, full coverage of formaldehyde and non-formaldehyde VOCs is achieved.

[0065] The first generator and the second generator of the embodiment of the present disclosure both use evaporation mixers, and are not limited to Figure 2 The structure shown. Figure 3a-3f It is a schematic diagram of the arrangement structure of the evaporation mixer according to an embodiment of the present disclosure.

[0066] like Figure 3a As shown, at least one VOCs liquid enters the evaporation mixer from the y direction, the carrier gas enters the evaporation mixer from the x direction, and the mixed VOCs gas is output from the evaporation mixer from the x direction.

[0067] like Figure 3b As shown, at least one VOCs liquid enters the evaporation mixer from the z direction, the carrier gas enters the evaporation mixer from the x direction, and the mixed VOCs gas is output from the evaporation mixer from the x direction.

[0068] like Figure 3c As shown, at least one VOCs liquid enters the evaporation mixer from the y direction, the carrier gas enters the evaporation mixer from the -y direction, and the mixed VOCs gas is output from the evaporation mixer from the x direction.

[0069] like Figure 3dAs shown, at least one VOCs liquid enters the evaporation mixer from the z direction, the carrier gas enters the evaporation mixer from the -z direction, and the mixed VOCs gas is output from the evaporation mixer from the x direction.

[0070] like Figure 3e As shown, at least one VOCs liquid and carrier gas enter the evaporation mixer along the x direction, and the VOCs liquid and carrier gas enter the evaporation mixer in the xy plane direction, and the mixed VOCs gas outputs the evaporation mixer from the x direction.

[0071] like Figure 3f As shown, at least one VOCs liquid and carrier gas enter the evaporation mixer along the x direction, and the VOCs liquid and carrier gas enter the evaporation mixer in the xz plane direction, and the mixed VOCs gas outputs the evaporation mixer from the x direction.

[0072] Figures 4a-4d It is a schematic diagram of the distribution of evaporation blocks in the evaporation mixer according to an embodiment of the present disclosure.

[0073] like Figure 4a As shown, a plurality of evaporation blocks are evenly distributed on the xy plane of the evaporation layer along the x direction. The evaporation blocks are square.

[0074] like Figure 4b As shown, a plurality of evaporation blocks are evenly distributed on the xy plane of the evaporation layer along the y direction. The evaporation blocks are in the shape of long strips.

[0075] like Figure 4c As shown, a plurality of evaporation blocks are evenly distributed in the xy plane of the evaporation layer in a matrix form. The evaporation blocks are square.

[0076] like Figure 4d As shown, a plurality of evaporation blocks are evenly distributed on the xz plane of the evaporation layer in a matrix form. The evaporation blocks are in the shape of long strips.

[0077] So far, the embodiments of the present disclosure have been described in detail in conjunction with the accompanying drawings. It should be noted that the implementation methods not shown or described in the drawings or the body of the specification are all forms known to ordinary technicians in the relevant technical field and are not described in detail. In addition, the above definitions of each element and method are not limited to the various specific structures, shapes or methods mentioned in the embodiments, and ordinary technicians in the field can simply change or replace them.

[0078] It should also be noted that the directional terms mentioned in the embodiments, such as "upper", "lower", "front", "back", "left", "right", etc., are only reference directions of the drawings and are not intended to limit the scope of protection of the present disclosure. Throughout the drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or configurations will be omitted when they may cause confusion in the understanding of the present disclosure.

[0079] Moreover, the shapes and sizes of the components in the figures do not reflect the real size and proportion, but only illustrate the contents of the embodiments of the present disclosure. In addition, in the claims, any reference symbols between brackets shall not be constructed as limiting the claims.

[0080] Unless otherwise indicated, the numerical parameters in this specification and the appended claims are approximate values ​​and can vary according to the desired properties obtained through the content of the present disclosure. Specifically, all numbers used in the specification and claims to express the content of the composition, reaction conditions, etc., should be understood to be modified by the term "about" in all cases. In general, the meaning of the expression is to include a variation of ±10% in some embodiments, ±5% in some embodiments, ±1% in some embodiments, and ±0.5% in some embodiments by a specific number.

[0081] Furthermore, the word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.

[0082] The ordinal numbers used in the specification and claims, such as "first", "second", "third", etc., to modify the corresponding elements, do not themselves mean that the elements have any ordinal numbers, nor do they represent the order of one element and another element, or the order in the manufacturing method. The use of these ordinal numbers is only used to clearly distinguish a component with a certain name from another component with the same name.

[0083] In addition, unless the steps are specifically described or must occur in sequence, the order of the above steps is not limited to the above list, and can be changed or rearranged according to the required design. And the above embodiments can be mixed and matched with each other or with other embodiments based on design and reliability considerations, that is, the technical features in different embodiments can be freely combined to form more embodiments.

[0084] Those skilled in the art will appreciate that the modules in the devices in the embodiments may be adaptively changed and set in one or more devices different from the embodiments. The modules or units or components in the embodiments may be combined into one module or unit or component, and in addition they may be divided into multiple submodules or subunits or subcomponents. All features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this manner may be combined in any combination, except that at least some of such features and / or processes or units are mutually exclusive. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature that provides the same, equivalent or similar purpose. Furthermore, in a unit claim that lists several devices, several of these devices may be embodied by the same hardware item.

[0085] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various disclosed aspects, in the above description of the exemplary embodiments of the present disclosure, the various features of the present disclosure are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting the following intention: the claimed disclosure requires more features than the features explicitly recited in each claim. More specifically, as reflected in the claims below, the disclosed aspects are less than all the features of the single embodiment disclosed above. Therefore, the claims that follow the specific embodiment are hereby expressly incorporated into the specific embodiment, with each claim itself serving as a separate embodiment of the present disclosure.

[0086] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present disclosure. It should be understood that the above description is only a specific embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A composite VOCs pollutant loading device, It is characterized in that include: A VOCs generating unit (100) is used to output a VOCs gas source, comprising a multi-channel VOCs liquid generating unit (101), a first carrier gas source unit (102) and a first generator (103), wherein the first generator (103) is connected to the multi-channel VOCs liquid generating unit (101) and the first carrier gas source unit (102); A formaldehyde generating unit (200) is used to output a formaldehyde gas source, comprising a methanol solution generating unit (201), a second carrier gas source unit (202), a second generator (203) and a catalyst pack (204), wherein the second generator (203) is connected to the methanol solution generating unit (201), the second carrier gas source unit (202) and the catalyst pack (204), wherein the catalyst pack (204) is used to convert methanol gas into formaldehyde gas by thermal cracking of paraformaldehyde; and A mixed output unit (300), used for outputting composite VOCs pollutants, and connected to the first generator (103) of the VOCs generating unit (100) and the catalytic package (204) of the formaldehyde generating unit (200); The first generator (103) comprises: A first evaporation layer, connected to the multi-channel VOCs liquid generating unit (101), for realizing evaporation of the multi-channel VOCs liquid; and A first mixing layer, connected to the first carrier gas source unit (102), used for preheating and mixing the evaporated VOCs gas and the carrier gas; The first evaporation layer and the first mixed layer are micro-nanoscale porous media with capillary structures; The first evaporation layer has a plurality of evaporation blocks for heating the VOCs liquid, and each of the evaporation blocks corresponds to an output of a liquid generating unit.

2. The composite VOCs pollutant loading device according to claim 1, It is characterized in that The second generator (203) comprises: a second evaporation layer, connected to the methanol solution generating unit (201), and used to achieve evaporation of the methanol solution; and A second mixing layer, connected to the second carrier gas source unit (202), used for preheating and mixing the evaporated methanol gas and the carrier gas; The second evaporation layer and the second mixed layer are micro-nano-scale porous media with capillary structures.

3. The composite VOCs pollutant loading device according to claim 1, It is characterized in that The multi-channel VOCs liquid generating unit (101) comprises: A liquid VOCs unit (1011), used for conveying liquid VOCs; and A liquid VOCs constant flow pump (1012) is connected to the liquid VOCs unit (1011) and is used to control the flow rate of the liquid VOCs.

4. The composite VOCs pollutant loading device according to claim 2, It is characterized in that The second evaporation layer has a plurality of evaporation blocks for heating the methanol solution.

5. The composite VOCs pollutant loading device according to claim 1, It is characterized in that The methanol solution generating unit (201) comprises: Methanol solution unit (2011), used to transport methanol solution; and A methanol solution constant flow pump (2012) is connected to the methanol solution unit (2011) and is used to control the flow rate of the methanol solution.

6. The composite VOCs pollutant loading device according to claim 1, It is characterized in that The first carrier gas source unit (102) comprises a first carrier gas inlet (1021), a first mass flow meter (1022) and a first one-way valve (1023) which are connected in sequence; and / or The second carrier gas source unit (202) comprises a second carrier gas inlet (2021), a second mass flow meter (2022), and a second one-way valve (2023) which are connected in sequence.

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