A production system and method for nano-microporous composite materials

Abstract

The present invention provides a production system of nano-microporous composite materials, comprising a closed room, a fluidizing device, a powder recovery device, a powder tank, a powder injection device with a hollow needle and a conveying mechanism of a fiber felt, wherein the conveying mechanism passes through the closed room, the powder injection device is arranged in the closed room, the fluidizing device is provided with an air inlet and a powder inlet, the fluid outlet of the fluidizing device is connected to a conveying pipeline, the conveying pipeline penetrates the closed room from the outside and is connected to the feed port of the powder injection device, and the exhaust port of the closed room is connected to the powder recovery device through a pipeline. The production system has a small investment in product equipment and does not use solvents and supercritical processes.

Description

Technical Field

[0001] The invention belongs to the technical field of thermal insulation materials, and in particular relates to a production system of nano-microporous composite materials. Background Art

[0002] Aerogel and its products have developed rapidly in recent years. Silica aerogel has achieved large-scale production and has been promoted and applied. The current global market size of aerogel and its products is 3-4 billion US dollars, and it is expected to reach 5-6 billion US dollars by 2020. Despite the rapid development, due to its high price, it is difficult to promote, and its total market size still occupies a relatively small share in the thermal insulation and energy-saving materials market.

[0003] In addition, the current production system of aerogel composite felt mainly comes from ASPEN in the United States. It uses the sol-gel method to first dissolve silica in a solvent, immerse it in an alkali-free glass fiber felt or other high-performance fiber felt through a fluid, and then gel in the fiber felt. After the gel is completed, it is replaced by solvent, supercritically dried, and the solvent is removed. The solvent is replaced with air to obtain an aerogel composite felt. This process uses a large amount of solvent and is very environmentally unfriendly. On the other hand, in the process of producing composite felts, the volume of various fiber felts is very large, but they have to be immersed in a lot of solvents and supercritically dried, which is very unfavorable for cost control. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a production system for nano-microporous composite materials. The production system mixes air and powder materials in a fluidizing device to fluidize the powder materials, and injects the fluid into the fiber felt through a powder injection device without the need for a liquid solvent. The resulting composite material is a nano-microporous composite material with low thermal conductivity.

[0005] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention is as follows:

[0006] A production system for aerogel nano-microporous composite materials comprises a closed room, a fluidizing device, a powder recovery device, a powder tank, a powder injection device with a hollow needle and a conveying mechanism for fiber felt, wherein the conveying mechanism passes through the closed room, the powder injection device is arranged in the closed room, the fluidizing device is provided with an air inlet and a powder inlet, the fluid outlet of the fluidizing device is connected to a conveying pipeline, the conveying pipeline penetrates the closed room from the outside and is connected to a feed port of the powder injection device, the exhaust port of the closed room is connected to the powder recovery device through a pipeline, the powder outlet of the powder recovery device is connected to the powder tank, the powder tank is connected to the powder inlet of the fluidizing device, and a pressure roller is arranged on the conveying mechanism.

[0007] The present invention fully mixes and stirs nano powder materials with air in a fluidizing device to form a uniform fluid; under the action of the airflow, the powder materials are injected into the fiber felt through a hollow needle, so that the powder materials enter the fiber felt and fill the gaps between the fibers; the fiber felt is pressed by a pressure roller so that the inside of the fiber felt is filled with the powder materials to form a dense, airtight, thermally insulating material.

[0008] The powder injection process is completed in a closed room, which can collect a large amount of dust generated during the production process to avoid air pollution. At the same time, the powder material can be recycled through the powder recovery device.

[0009] The fluidization device described in the present invention includes a tank body, a fan and a nozzle. The nozzle is arranged at the bottom of the tank body, a fluid outlet is arranged at the top of the tank body, the air inlet and the powder inlet are arranged at the inlet end of the nozzle, and the outlet end of the nozzle faces the tank body. A fan is arranged on both sides of the outside of the tank body, one end of the fan is connected to the air inlet pipe, and the other end of the fan is connected to the air outlet pipe. Air outlets connected to corresponding air outlet pipes are arranged on both sides of the top of the tank body, and air inlets connected to corresponding air inlet pipes are arranged on both sides of the bottom of the tank body.

[0010] Preferably, the air inlet of the fluidization device is connected to an air storage tank via an air compressor.

[0011] The powder injection device of the present invention includes a lifting mechanism, a fluid box and a first hollow needle. The fluid box is connected to the lifting mechanism above. The fluid box is provided with a feed port connected to the conveying pipe. The conveying pipe is a hose. The bottom surface of the fluid box is evenly distributed with a plurality of pinholes, and each pinhole is connected to one of the first hollow needles. The first hollow needle faces the fiber felt.

[0012] Preferably, a pinhole plate is arranged directly below the fluid box, and the pinhole plate is provided with needle holes corresponding to each first hollow needle.

[0013] Another optional technical solution of the present invention is that powder injection devices are arranged side by side above and below the fiber felt, respectively, and the powder injection device includes a blocking tube, a fixed bracket and a licker-in roller arranged on the conveying mechanism, the licker-in roller is arranged corresponding to the fiber felt, the licker-in roller is a hollow structure with one end open, the outer surface of the licker-in roller is evenly distributed with a plurality of pinholes, and each pinhole is connected to a second hollow needle, the blocking tube is arranged coaxially with the licker-in roller and is located inside the licker-in roller, one side of the blocking tube is provided with an axial opening, the opening side faces the fiber felt and the edge of the opening side is provided with a sealing strip, and the sealing strip abuts against the inner side wall of the licker-in roller; the closed end of the blocking tube is arranged at the closed end of the licker-in roller, the open end of the blocking tube is provided with a feed pipe passing through the open end of the licker-in roller, a sealing ring is arranged between the outer wall of the feed pipe and the inner side wall of the open end of the licker-in roller, the feed pipe is connected to the fixed bracket, and the inlet of the feed pipe is connected to the conveying pipeline.

[0014] Preferably, the sealing strip and the sealing ring are both polytetrafluoroethylene strips.

[0015] Preferably, the fiber felt is provided with a backing plate on the other side corresponding to the licker-in roller.

[0016] The powder recovery device of the present invention is a bag dust collector.

[0017] The present invention also provides a method for producing the aerogel microporous composite material, comprising the following steps:

[0018] A. Fully mix the nano powder material and air in a fluidizing device to form a uniform fluid;

[0019] B. Under the action of airflow, the powder is injected into the fiber felt through the hollow needle of the powder injection device, so that the powder material enters the fiber felt and fills the gaps between the fibers;

[0020] C. The fiber felt is pressed by a pressure roller so that the inside of the fiber felt is filled with powder material to form a dense, airtight, thermally insulating material; during the whole process, the powder material in the enclosed space is recovered by a powder recovery device for reuse.

[0021] Preferably, the volume ratio of gas to solid in the fluidizing device is 50-100: 1. A large gas-solid ratio can fully fluidize, and at the same time, the powder content in the fiber felt can be well controlled, and the powder material can be reasonably utilized.

[0022] Further preferably, the aperture of the hollow needle is 1-3 mm, and the fluid pressure in the fluidization device is 0.02-0.2 MPa. The aperture is 1-3 mm, so that the nano powder material can be closely attached to the fiber, and there is a strong interaction between the fiber material and the nano powder material, and it will not fall off; at the same time, with the fluid pressure of 0.02-0.2 MPa, the injection speed of the powder can be reasonably controlled, and the equipment load is small; if the pressure is too small, an effective injection effect cannot be formed, and if the pressure is too large, the equipment load is large, and the speed control becomes more difficult.

[0023] The beneficial effects of the present invention are:

[0024] 1. This system is suitable for injecting fluidized nano-porous powder and air into fiber felt through a hollow needle under the action of airflow and filling the gaps in the material. After pressing, the powder and fiber felt adhere together under the action of force, thereby preventing air from flowing in the fiber gaps and avoiding heat transfer due to air convection. The thermal conductivity is lower than that of various traditional thermal insulation materials.

[0025] 2. The system of the present invention can utilize a variety of nano-powder raw materials such as aerogel powder, nano-silicon dioxide powder and fumed silica that have been mass-produced to fill and block the gaps in the fiber felt. The product equipment investment is small, and no solvent or supercritical process is used. The powder injection device is arranged in a closed room, and the powder material in the closed room is recovered by a powder recovery device, and the recovered powder material is transported to a fluidized device to achieve recycling.

[0026] 3. A nozzle is set at the feed port of the fluidization device, and the fluid is sprayed into the tank at high speed through the nozzle, which will form a negative pressure around the nozzle, and the powder material is directly sucked into the tank from the powder inlet; at the same time, there is a certain pressure in the tank, and the fluid will automatically enter the conveying pipeline from the fluid outlet on the top of the tank under the action of pressure, without the need for a pressure pump, saving energy.

[0027] 4. A fan is installed on both sides of the outside of the fluidized device, forming an airflow circulation from bottom to top inside the tank and from top to bottom outside the tank, so that the light powder in the tank will not settle, which is more conducive to the full and uniform mixing of the powder and air. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the structure of the production system of the nano-microporous composite material of Examples 4 and 5.

[0029] Figure 2 Schematic diagram of the structure of the production system of the nano-microporous composite material of Examples 6-8.

[0030] Figure 3 It is a schematic diagram of the structure of the fluidization device.

[0031] Figure 4 It is a schematic diagram of the structure of the powder injection device of Examples 6-8.

[0032] Figure 5 It is a schematic diagram of the cross-sectional structure of the powder injection device of Examples 6-8.

[0033] Figure numerals: 1, fiber felt; 2, fluidizing device; 3, powder recovery device; 4, powder tank; 5, powder injection device; 6, conveying mechanism; 7, pressure roller; 8, closed room; 9, conveying pipeline; 10, lifting mechanism; 11, air compressor; 12, air storage tank; 21, air inlet; 22, powder inlet; 23, nozzle; 24, fan; 25, air inlet pipe; 26, air outlet pipe; 27, tank body; 31, exhaust port; 41, powder replenishment port; 51, fluid box; 52, first hollow needle; 53, pinhole plate; 54, licker-in roller; 55, second hollow needle; 56, blocking cylinder; 57, fixing bracket; 58, sealing ring; 59, sealing strip; 561, feed pipe; 60, bearing; 61, pad. DETAILED DESCRIPTION

[0034] In order to more clearly and in detail illustrate the technical solution of the present invention, the present invention is further described below through relevant embodiments. The following embodiments are only for specific explanation of the implementation method of the present invention, and do not limit the protection scope of the present invention.

[0035] Example 1

[0036] like Figure 1 and 2 As shown, a production system of an aerogel nano-microporous composite material comprises a closed room 8, a fluidizing device 2, a powder recovery device 3, a powder tank 4, a powder injection device 5 with a hollow needle and a conveying mechanism 6 for a fiber felt, wherein the conveying mechanism 6 passes through the closed room 8, the powder injection device 5 is arranged in the closed room 8, the fluidizing device 2 is provided with an air inlet 21 and a powder inlet 22, the fluid outlet of the fluidizing device 2 is connected to a conveying pipe 9, the conveying pipe 9 penetrates into the closed room 8 from the outside and is connected to the feed port of the powder injection device 5, the exhaust port of the closed room 8 is connected to the powder recovery device 3 through a pipe, the powder outlet of the powder recovery device 3 is connected to the powder tank 4, the powder tank 4 is connected to the powder inlet of the fluidizing device 2, and a pressure roller 7 is arranged on the conveying mechanism 6.

[0037] The ultrafine powder material and air are fully mixed and stirred in the fluidizing device 2 to form a uniform fluid; the fiber felt 1 reaches the position of the fluidizing device 2 under the transmission of the transmission mechanism 6, and under the action of the airflow, the ultrafine powder is injected into the fiber felt 1 through the hollow needle of the powder injection device 5, so that the powder material enters the fiber felt 1 and fills the gaps between the fibers; the fiber felt is pressed by the pressure roller 7, so that the inside of the fiber felt is filled with powder material to form a dense, airtight, and insulating material. In the whole process, the powder material in the closed room 8 is recovered by the powder recovery device 3, and the recovered powder material is transported to the fluidizing device 2 for recycling.

[0038] The powder tank 4 is also provided with a powder replenishing port 41 through which material is added.

[0039] The conveying mechanism can be a conventional conveying device such as a conveyor belt.

[0040] Example 2

[0041] This embodiment is based on embodiment 1:

[0042] like Figure 3 As shown, the fluidization device 2 includes a tank body 28, a fan 24 and a nozzle 23. The nozzle 23 is arranged at the bottom of the tank body 28, and a fluid outlet is arranged at the top of the tank body 28. The inlet end of the nozzle 23 is arranged with the air inlet 21 and the powder inlet 22. The outlet end of the nozzle 23 faces the inside of the tank body 28. A fan 24 is arranged on both sides of the outside of the tank body 28, one end of the fan 24 is connected to the air inlet pipe 25, and the other end of the fan 24 is connected to the air outlet pipe 26. The top of the tank body 28 is provided with air outlets connected to the corresponding air outlet pipes 26 on both sides, and the bottom of the tank body 28 is provided with air inlets connected to the corresponding air inlet pipes 25 on both sides.

[0043] A nozzle 23 is provided at the feed port of the fluidizing device 2, and the fluid is sprayed into the tank body 28 at a high speed through the nozzle 23, which will form a negative pressure around the nozzle, and the powder material is directly sucked into the tank body 28 from the powder inlet 22; at the same time, there is a certain pressure in the tank body 28, and the fluid will automatically enter the conveying pipe 9 from the fluid outlet at the top of the tank body 28 under the action of pressure.

[0044] A fan 24 is provided on both sides of the outside of the tank body 28, so that airflow circulation is formed from bottom to top inside the tank body 28 and from top to bottom outside the tank body 28, so that the light powder in the tank body 28 circulates inside and outside the tank body along with the airflow without settling, which is more conducive to the full and uniform mixing of the powder and the air, ensuring its full fluidization.

[0045] Example 3

[0046] This embodiment is based on Embodiment 2:

[0047] The air inlet 21 of the fluidizing device 2 is connected to the air storage tank 12 through the air compressor 11. The air is directly pressurized by the air compressor, and the pressurized air is directly sprayed into the tank body 28 at a high speed from the nozzle 23, so that there is a certain pressure in the tank body 28. By adjusting the pressure of the air compressor, the powder can be automatically sucked in and delivered to the powder injection device, and the fluid flow rate can be controlled without a pressure pump, saving energy.

[0048] Example 4

[0049] This embodiment is based on embodiment 1:

[0050] like Figure 1 As shown, the powder injection device 5 includes a lifting mechanism 10, a fluid box 51 and a first hollow needle 42. The fluid box 51 is connected to the lifting mechanism 10 above. The fluid box 51 is provided with a feed port connected to the conveying pipe 9. The conveying pipe 9 is a hose. The bottom surface of the fluid box 51 is evenly distributed with a plurality of pinholes, and each pinhole is connected to one of the first hollow needles 42. The first hollow needle 42 faces the fiber felt 1.

[0051] The fiber mat 1 is transported by the conveying mechanism 6 to the position of the powder injection device 5, and the lifting mechanism 10 is lowered to allow the first hollow needle 42 to penetrate the fiber mat 1, and the ultrafine powder is injected into the fiber mat 1 through the first hollow needle 42, so that the powder material enters the fiber mat 1; the lifting mechanism 10 is raised, and the first hollow needle 42 leaves the fiber mat 1, and the fiber mat 1 continues to be transported forward, and the lifting and lowering are repeated in this way to complete the injection process of the powder material into the fiber mat 1. Multiple powder injection devices 5 can be set on the conveying mechanism.

[0052] The lifting mechanism can be a conventional push-pull drive mechanism such as a cylinder.

[0053] The powder recovery device 3 is a bag dust collector, and conventional powder recovery devices are applicable to the present invention.

[0054] Example 5

[0055] This embodiment is based on Embodiment 4:

[0056] A pinhole plate 53 is disposed directly below the fluid box 51, and the pinhole plate 53 is provided with needle holes corresponding to the first hollow needles 42. When the first hollow needles 42 penetrate the fiber felt, they are inserted into the needle holes of the pinhole plate 53 without damaging the first hollow needles. At the same time, the pinhole plate 53 below the fiber felt 1 also plays a role in bearing force.

[0057] Example 6

[0058] This embodiment is based on embodiment 1:

[0059] like Figure 2-5As shown, a powder injection device 5 is arranged side by side above and below the fiber felt 1, respectively. The powder injection device 5 includes a blocking cylinder 56, a fixing bracket 57 and a licker-in roller 54 arranged on a conveying mechanism 6. The licker-in roller 54 is arranged corresponding to the fiber felt 1. The licker-in roller 54 is a hollow structure with one end open. The outer surface of the licker-in roller 54 is uniformly distributed with a plurality of needle holes, and each needle hole is connected to a second hollow needle 55. The blocking cylinder 56 is arranged coaxially with the licker-in roller 54 and is located inside the licker-in roller 54. One side of the blocking cylinder 56 is provided with an axial opening. The open side faces the fiber felt 1 and a sealing strip 59 is arranged around the edge of the open side, and the sealing strip 59 abuts against the inner wall of the licker-in roller 54; the closed end of the blocking tube 56 is arranged at the closed end of the licker-in roller 54, and the open end of the blocking tube 56 is provided with a feed pipe 561 passing through the open end of the licker-in roller 54, and a sealing ring 58 is arranged between the outer wall of the feed pipe 561 and the inner wall of the open end of the licker-in roller 54, the feed pipe 561 is connected to the fixed bracket 57, and the inlet of the feed pipe 561 is connected to the conveying pipeline 9.

[0060] The pricking roller 54 rolls on the top of the fiber felt 1, and the blocking cylinder 56 is fixedly installed on the top of the fiber felt 1 through the fixed bracket 57, and the open side of the blocking cylinder 56 faces the fiber felt 1, and the conveying pipe 9 is connected to the feed pipe 561 of the blocking cylinder 56 to feed the fluid into the blocking cylinder 56, and the powder material penetrates into the fiber felt 1 from the second hollow needle 55 on the open side, so that the powder material enters the interior of the fiber felt 1; when the second hollow needle 55 leaves the fiber felt 1, that is, leaves the open side of the blocking cylinder 56, the powder material is blocked by the blocking cylinder 56 and will not be discharged.

[0061] A sealing strip 59 is arranged around the edge of the opening side to abut against the inner wall of the licker-in roller 54, which can prevent the powder material from entering the gap between the licker-in roller 54 and the blocking tube 56, and prevent the second hollow needle 55 from leaking powder after leaving the fiber felt; a sealing ring 58 is arranged between the outer wall of the discharge pipe 561 of the blocking tube 56 and the inner wall of the opening end of the licker-in roller 54, which also plays a role in preventing the powder material from entering the gap between the licker-in roller 54 and the blocking tube 56.

[0062] Example 7

[0063] This embodiment is based on Embodiment 6:

[0064] The sealing strip 59 and the sealing ring 58 are both polytetrafluoroethylene strips. The polytetrafluoroethylene strips are soft and conducive to sealing, and have low friction and are convenient for dynamic sealing.

[0065] Example 8

[0066] This embodiment is based on Embodiment 6:

[0067] The fiber mat 1 is provided with a backing plate 61 on the other side corresponding to the licker-in roller 54. When the licker-in roller 54 is rolled, it plays a role of receiving force.

[0068] Example 9

[0069] The production system of the present invention is used for producing a method for producing a nano-microporous composite material, comprising the following steps:

[0070] A. Fully mix the aerogel powder and air in a fluidizing device to form a uniform fluid;

[0071] B. Under the action of airflow, the powder is injected into the fiber felt through the hollow needle of the powder injection device, so that the powder material enters the fiber felt and fills the gaps between the fibers.

[0072] C. The fiber felt is pressed by a pressure roller so that the inside of the fiber felt is filled with powder material to form a dense, airtight insulating material with a thermal conductivity of 0.030 W / (mk).

[0073] During the whole process, the powder material in the confined space is recovered and reused through the powder recovery device.

[0074] The volume ratio of gas to solid in the fluidization device is 50:1.

[0075] The hole diameter of the hollow needle is 1 mm, and the fluid pressure in the fluidization device is 0.02 MPa.

[0076] Example 10

[0077] This embodiment is based on the embodiment 9.

[0078] The hydrophobic silica powder and air were fully mixed in a fluidizing device as a fluid, and injected into the alkali-free glass fiber felt to obtain a thermal conductivity of 0.029 W / (mk) for the thermal insulation material.

[0079] The volume ratio of gas to solid in the fluidization device is 80:1.

[0080] The hole diameter of the hollow needle is 3 mm, and the fluid pressure in the fluidization device is 0.05 MPa.

[0081] Embodiment 11

[0082] This embodiment is based on the embodiment 9.

[0083] Alumina powder and iron oxide powder were fully mixed with air in a fluidizing device at a ratio of 1:1 as a fluid, and injected into the basalt fiber felt to obtain a thermal conductivity of the insulation material of 0.032 W / (mk).

[0084] The volume ratio of gas to solid in the fluidization device is 50:1.

[0085] The hole diameter of the hollow needle is 2 mm, and the fluid pressure in the fluidization device is 0.03 MPa.

[0086] Example 12

[0087] This embodiment is based on the embodiment 9.

[0088] Aerogel powder and fumed silica powder were fully mixed with air in a fluidizing device at a ratio of 1:1 as a fluid, and injected into the silica fiber felt to obtain a thermal conductivity of the insulation material of 0.026 W / (mk).

[0089] The volume ratio of gas to solid in the fluidization device is 100:1.

[0090] The hole diameter of the hollow needle is 3 mm, and the fluid pressure in the fluidization device is 0.2 MPa.

[0091] Embodiment 13

[0092] This embodiment is based on the embodiment 9.

[0093] Hydrophobic silica powder, aerogel powder, alumina powder and iron oxide powder were fully mixed with air in a fluidizing device at a ratio of 4:2:1:1 as a fluid, and injected into the alkali-free glass fiber felt to obtain a thermal conductivity of the insulating material of 0.024W / (mk).

[0094] The volume ratio of gas to solid in the fluidizing device is 60:1.

[0095] The hole diameter of the hollow needle is 2 mm, and the fluid pressure in the fluidization device is 0.1 MPa.

[0096] Embodiment 14

[0097] In this example, the same raw materials and dosages as in Example 13 were used to prepare an aerogel composite felt by a gel method, and compared with the present invention. The following is a comparison of product performance data.

[0098]

[0099] The above-mentioned embodiments only express the specific implementation of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A production system for nano-microporous composite materials, characterized in that: It comprises a closed room, a fluidizing device, a powder recovery device, a powder tank, a powder injection device with a hollow needle and a conveying mechanism of a fiber felt, wherein the conveying mechanism passes through the closed room, the powder injection device is arranged in the closed room, the fluidizing device is provided with an air inlet and a powder inlet, the fluid outlet of the fluidizing device is connected to a conveying pipeline, the conveying pipeline penetrates the closed room from the outside and is connected to the feed port of the powder injection device, the exhaust port of the closed room is connected to the powder recovery device through a pipeline, the powder outlet of the powder recovery device is connected to the powder tank, the powder tank is connected to the powder inlet of the fluidizing device, and a pressure roller is arranged on the conveying mechanism; The fluidization device comprises a tank body, a fan and a nozzle, the bottom of the tank body is provided with the nozzle, the top of the tank body is provided with a fluid outlet, the inlet end of the nozzle is provided with the air inlet and the powder inlet, the outlet end of the nozzle faces the tank body, a fan is provided on both sides of the outside of the tank body, one end of the fan is connected to the air inlet pipe, and the other end of the fan is connected to the air outlet pipe, the top of the tank body is provided with air outlets connected to the corresponding air outlet pipes, and the bottom of the tank body is provided with air inlets connected to the corresponding air inlet pipes; The powder injection device includes a lifting mechanism, a fluid box and a first hollow needle. The fluid box is connected to the lifting mechanism above. The fluid box is provided with a feed port connected to the conveying pipe. The conveying pipe is a hose. The bottom surface of the fluid box is evenly distributed with a plurality of needle holes, and each needle hole is connected to one of the first hollow needles. The first hollow needle faces the fiber felt.

2. The production system of nano-microporous composite material according to claim 1, characterized in that: The air inlet of the fluidization device is connected to the air storage tank through an air compressor.

3. The production system of nano-microporous composite material according to claim 1, characterized in that: A pinhole plate is arranged directly below the fluid box, and the pinhole plate is provided with needle holes corresponding to the first hollow needles.

4. The production system of nano-microporous composite material according to claim 1, characterized in that: Powder injection devices are arranged side by side above and below the fiber felt, respectively, and the powder injection devices include a blocking tube, a fixed bracket and a licker-in roller arranged on the conveying mechanism, the licker-in roller is arranged corresponding to the fiber felt, the licker-in roller is a hollow structure with one end open, the outer surface of the licker-in roller is evenly distributed with a plurality of pinholes, and each pinhole is connected to a second hollow needle, the blocking tube is arranged coaxially with the licker-in roller and is located inside the licker-in roller, one side of the blocking tube is provided with an axial opening, the opening side faces the fiber felt and the edge of the opening side is provided with a sealing strip, and the sealing strip abuts against the inner side wall of the licker-in roller; the closed end of the blocking tube is arranged at the closed end of the licker-in roller, the open end of the blocking tube is provided with a feed pipe passing through the open end of the licker-in roller, a sealing ring is arranged between the outer side wall of the feed pipe and the inner side wall of the open end of the licker-in roller, the feed pipe is connected to the fixed bracket, and the inlet of the feed pipe is connected to the conveying pipeline.

5. The production system of nano-microporous composite material according to claim 4, characterized in that: The sealing strip and the sealing ring are both polytetrafluoroethylene strips.

6. The production system of nano-microporous composite material according to claim 5, characterized in that: The fiber felt is provided with a backing plate on the other side corresponding to the licker-in roller.

7. The production system of nano-microporous composite material according to claim 1, characterized in that: The powder recovery device is a bag dust collector.

8. The production method of the production system of the nano-microporous composite material according to claim 1, characterized in that: The following steps are involved: A. Fully mix the nano powder material and air in a fluidizing device to form a uniform fluid; B. Under the action of airflow, the powder is injected into the fiber felt through the hollow needle of the powder injection device, so that the powder material enters the fiber felt and fills the gaps between the fibers; C. Press the fiber felt with a pressure roller so that the inside of the fiber felt is filled with powder material to form a dense, airtight insulation material; During the whole process, the powder material in the confined space is recovered and reused through the powder recovery device.

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