Negative pressure pneumatic conveying system capable of rapidly cooling powder

Abstract

The utility model provides a negative-pressure pneumatic conveying system capable of rapidly cooling powder, which comprises a powder bin, a negative-pressure pneumatic conveying device and a cooling device, and is characterized in that the powder bin is used for storing high-temperature powder; the air inlet cooling unit is used for preparing cold air with preset low temperature; the mixer is used for mixing the high-temperature powder and cold air and rapidly cooling the high-temperature powder; the negative pressure collector is used for collecting the cooled powder through settling separation, and secondary cooling is carried out on the powder by utilizing a liquid cooling close-packed pipe arranged in the negative pressure collector; and the bin pump material receiving opening is used for opening the ash discharging valve to discharge materials outwards when the powder materials in the negative pressure collector are monitored to reach the preset material level. Compared with powder storage natural cooling or powder conveying cooling by adopting a water cooling jacket or a plate heat exchanger, the powder is fully mixed and cooled with the cold source gas through the especially large specific surface area, rapid cooling is achieved in the powder conveying process, the plant area and the equipment height are greatly reduced, the cooling efficiency is improved, and the production cost is reduced. And the time cost, the investment cost and the production cost are also saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of material conveying, in particular to a negative pressure pneumatic conveying system for rapidly cooling powder. BACKGROUND

[0002] In the related art, when cooling powder, a cooling tower is usually used to cool the powder, and then the cooled powder is blown into a powder pile or a conveying pipeline to achieve the purpose of cooling. Alternatively, when the powder is conveyed in a pipeline, a cooling liquid is arranged on the outer wall of the pipeline to cool the powder.

[0003] However, the above-mentioned method has the following defects. On the one hand, a special cooling device is needed, which not only takes a lot of time and effort to lay, but also occupies a large area of the factory building and has a high cost. On the other hand, a lot of time is spent waiting for cooling, which results in low cooling efficiency and cannot achieve the purpose of rapid cooling. CONTENT OF THE INVENTION

[0004] In view of the above-mentioned defects of the prior art, the present application aims to provide a negative pressure pneumatic conveying system for rapidly cooling powder, which solves the problem that the powder cannot be rapidly cooled in the prior art.

[0005] To achieve the above-mentioned and other related purposes, the first aspect of the present application provides a negative pressure pneumatic conveying system for rapidly cooling powder, comprising: a powder bin for storing high-temperature powder; an air inlet cooling unit for preparing cold air at a preset low temperature; a mixer, the input end of which is connected to the powder bin and the air inlet cooling unit, for mixing the high-temperature powder and the cold air, rapidly cooling the high-temperature powder by heat exchange, and obtaining cooled powder; and a negative pressure collector connected to the output end of the mixer, for collecting the cooled powder by sedimentation and filter separation, and performing secondary cooling on the cooled powder by a liquid-cooled dense tube arranged in the negative pressure collector, to obtain low-temperature powder.

[0006] In some embodiments of the first aspect of the present application, a bin pump receiving port is arranged at the bottom of the negative pressure collector, and when the low-temperature powder reaches a preset material level, a dust discharge valve is opened to communicate the bin pump receiving port and discharge the material outside.

[0007] In some embodiments of the first aspect of the present application, a compressed air source is connected to the upper part of the negative pressure collector to spray and blow the filter material, clean the cooled powder attached to the surface of the filter material, and output clean air.

[0008] In some embodiments of the first aspect of the present application, further comprising: a vacuum pump and an exhaust fan connected in sequence to the negative pressure collector, the vacuum pump providing negative pressure for the negative pressure collector, and the exhaust fan being used for discharging the clean air, and the silencer being arranged at the output end of the exhaust fan to mute the clean air.

[0009] In some embodiments of the first aspect of the present application, further comprising: a first excess pressure valve and a second excess pressure valve, the first excess pressure valve being arranged between the air inlet cooling unit and the mixer, and the second excess pressure valve being arranged between the vacuum pump and the exhaust fan, to maintain pressure balance between the negative pressure pneumatic conveying system and the exhaust system.

[0010] In some embodiments of the first aspect of the present application, further comprising: a variable frequency discharge port arranged below the powder bin, and the discharge speed of the powder bin being adaptively adjusted according to the real-time temperature of the low-temperature powder received by the negative pressure collector.

[0011] In some embodiments of the first aspect of the present application, the lower part of the negative pressure collector is provided with a fluidization device for uniformly outputting and cooling the cooled powder.

[0012] In some embodiments of the first aspect of the present application, the liquid-cooled dense tube is provided with flowing cooling liquid.

[0013] In some embodiments of the first aspect of the present application, the pipeline is a seamless steel pipe, and the inner lining of the seamless steel pipe is a ceramic wear-resistant part.

[0014] In some embodiments of the first aspect of the present application, the lower end of the negative pressure collector is further provided with an abnormal discharge port.

[0015] As described above, the technical scheme of the powder rapid cooling negative pressure pneumatic conveying system provided by the present application has the following beneficial effects:

[0016] In the pipeline transmission, the present application can rapidly reduce the temperature of the powder by rapidly exchanging heat after mixing the cold air with the high-temperature powder, and compared with other cooling methods, the present application not only has rapid cooling, but also saves the cooling cost. At the same time, the cooled powder is collected by the settlement and filter material separation method, which avoids the leakage of the powder during the cooling process. The liquid-cooled dense tube in the negative pressure collector is used to perform secondary cooling on the cooled powder, so as to ensure that the cooled powder reaches the required low temperature. The double cooling mechanism significantly improves the cooling effect. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 A structure block diagram of a powder rapid cooling negative pressure pneumatic conveying system provided by the present application is shown. DETAILED DESCRIPTION

[0018] The advantages and effects of the present application can be easily understood by those skilled in the art from the description of the specific embodiments. The present application can also be implemented or applied in other different specific embodiments, and various modifications or changes can be made to the details in the description without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0019] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present application in a schematic manner, and only the components related to the present application are shown in the diagrams, not the number, shape and size of the components when actually implemented. The actual implementation of each component may be a random change, and the component layout may be more complex.

[0020] Please refer to Figure 1 A structure block diagram of a negative pressure pneumatic conveying system for rapid cooling of powder provided by the present application is as follows:

[0021] Powder bin 1 for storing high-temperature powder;

[0022] Exemplarily, the powder bin provides a stable powder storage environment to prevent the powder from being affected by moisture, oxidation or other adverse factors during storage. At the same time, the sealing design ensures the continuity and stability of the powder during transportation. For example, according to the properties of the powder, the material of the powder bin is selected to be stainless steel, wear-resistant alloy, etc. to improve the durability and corrosion resistance of the powder bin. Specifically, the powder bin is a sealed container provided with a feeding port and a discharging port. The warm powder enters the powder bin through the feeding port, is stored until it needs to be used, and is discharged through the discharging port.

[0023] Air inlet cooling unit 2 for preparing cold air at a preset low temperature;

[0024] Exemplarily, the air inlet cooling unit is based on a refrigeration cycle, which cools the gas to a preset low temperature state through compression, condensation, expansion and evaporation processes. For example, the gas is compressed by a compressor, and the high-temperature and high-pressure gas is cooled into a high-pressure liquid by a condenser. The high-pressure liquid is then decompressed and partially evaporated by an expansion valve to absorb heat, obtaining low-temperature and low-pressure cold air, which is cooled by an evaporator and then delivered to the mixer. In addition, a heat pump device can be added to the air inlet cooling unit to improve the refrigeration efficiency and reduce energy consumption.

[0025] Mixer 3, the input end pipeline of which is connected to the powder bin and the air inlet cooling unit, is used for mixing the high-temperature powder and the cold air, and rapidly cooling the high-temperature powder by heat exchange to obtain cooled powder;

[0026] For example, the mixer utilizes the shear force and turbulence effect generated by the stirring device to ensure thorough contact and mixing of high-temperature powder with cold air. Through heat exchange, the cold air absorbs heat from the powder, thereby reducing its temperature. For instance, when high-temperature powder and cold air enter the mixer simultaneously, they are thoroughly mixed through stirring; the high-temperature powder is rapidly cooled through heat exchange, forming cooled powder. Furthermore, a cooling device can be added to regulate the temperature within the mixer and improve mixing efficiency; or, the stirring device may include, but is not limited to, a turbine or propeller.

[0027] The negative pressure collector 4 is connected to the output end of the mixer through a pipeline. It collects the cooled powder through sedimentation and filter media separation. The liquid-cooled dense pipe in the negative pressure collector is used to cool the cooled powder a second time to obtain low-temperature powder.

[0028] For example, the negative pressure collector uses the suction force generated by negative pressure to draw the cooled powder into the collector; the powder is separated from the gas through sedimentation and filter media separation; simultaneously, liquid-cooled dense-packed pipes provide secondary cooling of the powder to meet specific temperature requirements (pre-set by the user according to needs). For example, filter media (such as...) Figure 1 The filter 6 shown includes, but is not limited to, metal mesh, cloth bags, etc., to adapt to different powder properties. It should be noted that the filter can be installed inside the negative pressure collector, or both inside and outside the negative pressure collector. When installed outside the negative pressure collector, it is installed at the output end of the heat exchanger 5. Alternatively, the lower part of the negative pressure collector is equipped with a fluidizing device for uniform output and cooling of the powder. For example, the fluidizing device is a vibration device to improve filtration efficiency and the settling velocity of the cooled powder.

[0029] It should be understood that, considering the characteristics of the dust, appropriate filter media should be selected. For example, dust filtration can be achieved through sedimentation and pleated conveyor belt filtration, or through pleated filter bags in the overall equipment dust removal filtration system. The filter media should utilize advanced antistatic nanofiber membrane-coated pleated filter bags, possessing high filtration accuracy, flame retardancy, and antistatic properties. Since liquid-cooled dense-pack pipes contain coolant, for example, taking the lowest possible cooling cost, a two-layer water-cooled dense-pack pipe structure should be selected to improve cooling efficiency.

[0030] In this way, the powder is rapidly cooled during pipeline transport by mixing cold air with the high-temperature powder and exchanging heat quickly. Compared with other cooling methods, this not only cools the powder faster but also saves on cooling costs. At the same time, the cooled powder is collected through sedimentation and filter media separation, preventing leakage during the cooling process. The liquid-cooled dense-packed pipes in the negative pressure collector provide secondary cooling for the cooled powder, ensuring that the powder reaches the required low temperature. This dual cooling mechanism significantly improves the cooling effect.

[0031] Optionally, in some embodiments, the negative pressure pneumatic conveying system for rapidly cooling the powder further comprises a bin pump receiving port arranged at the bottom of the negative pressure collector, and when the low-temperature powder reaches a preset level, the ash discharge valve is opened to communicate the bin pump receiving port to discharge the powder.

[0032] Optionally, in some embodiments, the negative pressure pneumatic conveying system for rapidly cooling the powder further comprises a bin pump receiving port arranged at the bottom of the negative pressure collector, and when the low-temperature powder reaches a preset level, the ash discharge valve is opened to communicate the bin pump receiving port to discharge the powder.

[0033] In addition, it should be noted that a porous mesh is arranged in the pipeline below the powder bin and located in the mixer to prevent powder congestion.

[0034] In this application, by monitoring the level of low-temperature powder in real time, when the level reaches a preset level, the ash discharge valve is opened to communicate the bin pump receiving port to discharge the powder, and the whole process is automatically operated, which improves the efficiency of the negative pressure pneumatic conveying system.

[0035] Optionally, in some embodiments, the negative pressure collector is connected to a compressed air source at the upper part to spray and clean the filter material on which the cooling powder is attached, and output clean air, wherein the filter material is a high-temperature filter material.

[0036] In this application, by monitoring the level of low-temperature powder in real time, when the level reaches a preset level, the ash discharge valve is opened to communicate the bin pump receiving port to discharge the powder, and the whole process is automatically operated, which improves the efficiency of the negative pressure pneumatic conveying system.

[0037] Optionally, in some embodiments, the negative pressure pneumatic conveying system for rapidly cooling the powder further comprises a bin pump receiving port arranged at the bottom of the negative pressure collector, and when the low-temperature powder reaches a preset level, the ash discharge valve is opened to communicate the bin pump receiving port to discharge the powder.

[0038] By the above-mentioned mode, the compressed air is used for blowing cleaning, the cooling powder on the surface of the filter material can be quickly cleaned, the cleaning efficiency is improved, the powder is dredged, and the temperature of the powder is reduced; by cleaning the accumulated dust on the surface of the filter material, the plugging and wear of the filter material can be reduced, and the service life is prolonged; by the filter material, the small particulate matters and impurities in the air can be removed, and the quality of the output air is ensured. In addition, the compressed air is used for blowing cleaning, the equipment is simple, the operation is convenient, and the maintenance cost is low.

[0039] Optionally, in some embodiments, it further comprises: sequentially connecting the vacuum pump 7 and the exhaust fan 8 of the negative pressure collector by pipelines, the vacuum pump 7 is used for providing negative pressure for the negative pressure collector, and the exhaust fan is used for discharging the clean air, and the silencer is used for silencing the clean air filtered and purified.

[0040] The vacuum pump and the exhaust fan are arranged outside the negative pressure collector, the vacuum pump performs air suction by mechanical movement generated by electricity, and the sucked air is discharged into the atmosphere through the exhaust port, so that negative pressure is formed at the air suction port, and the vacuum pump can adopt multiple groups of vacuum pumps, for example, a main vacuum pump and a standby vacuum pump, so as to improve the stable output capacity of the vacuum pump or meet the demand for different negative pressures.

[0041] Exemplarily, the silencer is usually installed near the exhaust port of the exhaust fan, and is used for reducing the noise generated when the air is discharged. Since the silencer contains multiple chambers and pipeline structures inside, the sound waves can be reflected, interfered and absorbed through these structures, so that the propagation of the noise is reduced; at the same time, the silencer is filled with sound-absorbing materials such as foamed plastic and glass fiber, so that the noise reduction effect is enhanced.

[0042] Optionally, in some embodiments, it further comprises: a first excess pressure valve 10 and a second excess pressure valve 11, the first excess pressure valve 10 is arranged between the air inlet cooling unit and the mixer, and the second excess pressure valve 11 is arranged between the vacuum pump and the exhaust fan, so as to maintain the pressure balance of the negative pressure pneumatic conveying system and the exhaust system.

[0043] Exemplarily, in the negative pressure pneumatic conveying system, the first excess pressure valve is arranged between the air inlet cooling unit and the mixer, after the air inlet cooling unit cools the entering air, the air enters the first excess pressure valve through the pipeline, the first excess pressure valve automatically adjusts the opening degree according to the pressure change in the system, so as to maintain the stable pressure in the system. When the pressure in the system rises, the first excess pressure valve automatically opens to release part of the pressure; when the pressure in the system decreases, the first excess pressure valve automatically closes to prevent external air from entering.

[0044] The second excess pressure valve is arranged between the vacuum pump and the exhaust fan, the vacuum pump maintains a negative pressure state by extracting gas in the system, and the second excess pressure valve automatically adjusts the opening degree according to the pressure change at the outlet of the vacuum pump to ensure that the vacuum pump can work stably and efficiently. When the negative pressure at the outlet of the vacuum pump rises, the second excess pressure valve automatically opens to release part of the pressure; when the negative pressure decreases, it automatically closes.

[0045] In the above manner, not only can the pressure balance between the system and the exhaust system be automatically adjusted to keep it within a preset pressure range, ensuring stable operation of the system (i.e. the negative pressure pneumatic conveying system), but also the pressure in the system can be accurately controlled to reduce energy loss and improve the energy utilization efficiency of the entire system. At the same time, the pressure on the equipment is reduced, ensuring the service life of the equipment.

[0046] Optionally, in some embodiments, it further comprises a variable frequency discharge port 9 arranged below the powder bin, which adaptively adjusts the discharging speed of the powder bin according to the real-time temperature of the low-temperature powder received by the negative pressure collector.

[0047] For example, the variable frequency discharge port is arranged below the powder bin, and the variable frequency discharge port is connected to the motor through a frequency converter, thereby realizing accurate control of the discharging speed. By monitoring the real-time temperature information of the low-temperature powder and feeding it back to the control system, for example, according to the received real-time temperature information, the output frequency of the frequency converter is automatically adjusted, thereby changing the speed of the motor, so as to realize adaptive adjustment of the discharging speed, achieving the effect of precise cooling and cooling of the powder.

[0048] In the above manner, on the one hand, the discharging speed is automatically adjusted according to the real-time temperature of the powder by the frequency conversion and speed regulation technology, realizing accurate control of the discharging speed, thereby ensuring stable output of the powder and stable operation of the system; on the other hand, the variable frequency discharge port can adjust the speed of the motor according to the actual demand, achieving the purpose of saving energy.

[0049] Optionally, in some embodiments, the liquid-cooled close-packed pipe (such as the heat exchanger 5 shown in Figure 1 The liquid-cooled close-packed pipe is arranged in the liquid-cooled close-packed pipe.

[0050] For example, the liquid-cooled close-packed pipe is designed as a metal plate with high heat conduction performance, and a channel for the flow of cooling liquid is arranged inside the liquid-cooled close-packed pipe. The inlet and outlet of the cooling liquid are connected to the internal channel of the liquid-cooled close-packed pipe by welding or other connection methods to form a complete cooling liquid circulation system.

[0051] In the above manner, the collected cooling powder is subjected to secondary cooling, improving the cooling efficiency of the powder.

[0052] Optionally, in some embodiments, the pipe is a seamless steel pipe, and the inner lining of the seamless steel pipe is a ceramic wear-resistant part.

[0053] Exemplarily, the steel pipe has a wall thickness greater than or equal to 3 mm, a ceramic wear-resistant lining is used in the 8-mm-thick seamless steel pipe, and the elbow, tee, reducer, and valve are lined with the ceramic wear-resistant lining.

[0054] In the above manner, since the seamless steel pipe has high mechanical strength and pressure-bearing capacity, it can bear large pressure and load, the ceramic wear-resistant lining with a preset thickness is arranged in the seamless steel pipe, the ceramic wear-resistant lining is combined with the seamless steel pipe by using the high hardness, high wear resistance, and high corrosion resistance of the ceramic wear-resistant lining, and a composite pipeline is formed, and it should be noted that the ceramic layer can effectively reduce the wear and corrosion of the pipeline during conveying, prolong the service life, and at the same time, the service life is relatively long, and the frequency of replacement and maintenance can be reduced.

[0055] Optionally, the lower end of the negative pressure collector is further provided with an abnormal discharge port, for example, when the temperature sensor and the material level sensor of the control system detect that the temperature of the low-temperature powder is abnormal or the material level is abnormal, the abnormal discharge port can be opened for unloading to ensure that the low-temperature powder after cooling is normal.

[0056] Optionally, in actual application, the implementation mode of the negative pressure pneumatic conveying system for rapidly cooling powder is as follows:

[0057] The dust in the dust collector ash bin continuously and uninterruptedly falls into the lower ash bin through the lower star-shaped dust unloading valve, a material level meter is installed in the ash bin, and an electric plug valve is installed at the bottom of the ash bin. When the material level meter detects a high material level, a signal is sent to control the electric two-way valve to open, air enters the negative pressure conveying pipeline, the electric plug valve slowly opens, the dust gradually falls and mixes with the air, the material is conveyed to the dust collector and the ash storage bin through the dilute phase conveying pipeline, and the purified clean gas is discharged after passing through the vacuum pump and the silencer. The application provides negative pressure by using the vacuum pump as a power source, adopts a high negative pressure bag-type dust collector for dust separation, and is provided with an ash storage bin, a dust unloading valve, and a plug valve (an integrated device), and a filter dust mixing gas way.

[0058] Since the pneumatic conveying pipeline considers that the dust has a certain abrasiveness to the pipeline, an 8-mm-thick seamless steel pipe lined with a ceramic wear-resistant lining is used, and the elbow, tee, reducer, and valve are lined with the ceramic wear-resistant lining. At the same time, since the equipment working body and the silicon powder belong to one area, all the equipment needs to consider dust explosion-proof design.

[0059] In addition, the pneumatic conveying pipeline and part of the valve are installed on the roof, the main part of the pneumatic conveying dust removal unit is installed on the east floor, and all the middle parts are connected by seamless steel pipes.

[0060] It should be noted that the filtering efficiency of the pleated filter bag should be greater than or equal to 99.8%, and the dust concentration of the air discharged to the outdoor air after treatment is less than or equal to 10 mg / m 3, and a detection port is reserved on the exhaust pipe. According to the dust characteristics, the filter air speed is designed to be less than 0.6 m / min, and the box section air speed is less than 2.5 m / s. The advanced dust cleaning controller is adopted, and the blowing interval and pulse width can be adjusted. The dust cleaning controller has the functions of pressure difference, time sequence and offline dust cleaning. The electromagnetic pulse valve selects a pilot type, and the pipeline installation is neat and beautiful.

[0061] It should be further pointed out that the lower end of the negative pressure dust collector has a cyclone function, the cyclone dust collector shell material thickness is 5 mm, and the wear resistance of the powder is fully considered in the design (5 mm ceramic lining needs to be installed); the flange connection is adopted between the straight cylinder and the conical cylinder, and direct welding is not allowed; the support legs must meet the strength and wind / shock resistance requirements.

[0062] Through the above-mentioned mode, compared with the natural cooling of the powder during storage or the cooling of the powder during transportation by using a water-cooled jacket or a plate heat exchanger, the powder is fully mixed with the cold source gas and cooled, and rapid cooling is realized during powder transportation, which greatly reduces the plant area and the powder temperature, improves the cooling efficiency, and saves the time cost, investment cost and production cost.

[0063] In the prior art, since the powder can be used to manufacture key components such as solar cell panels and energy storage devices, rapid cooling is often required. In a pneumatic conveying pipeline of less than 30 meters, the inlet cooling unit generates a cold air flow of 5-8 degrees Celsius, and the wind speed is about 30 meters per second. The initial temperature of the high-temperature powder is less than 200 degrees Celsius, and in nearly 1 second, the negative pressure pneumatic conveying system for rapidly cooling the powder of the present application rapidly cools the powder to 60-80 degrees Celsius through heat exchange with cold air to achieve the effect of continuous and rapid cooling.

[0064] Through the above-mentioned mode, during the pipeline transmission of the powder, the cold gas is mixed with the high-temperature powder and then rapidly exchanges heat, ensuring that the high-temperature powder is rapidly cooled in a short time. Compared with other cooling methods, not only is the cooling fast, but also the cooling cost is saved. At the same time, the cooled powder is collected by sedimentation and filter material separation, avoiding leakage of the powder during cooling. The cooled powder is further cooled by the liquid-cooled dense tube in the negative pressure collector, ensuring that the cooled powder reaches the required low temperature. The use of this double cooling mechanism significantly improves the cooling effect. In addition, the level of the low-temperature powder is monitored in real time, and when the level reaches the preset level, the dust discharge valve is opened to connect the bin pump to discharge the material, which is fully automated and improves the efficiency of the negative pressure pneumatic conveying system.

[0065] The above embodiments are only illustrative of the principles of the present application and its effects, and are not intended to limit the present application. Any modification or change made by any person skilled in the art without departing from the spirit and scope of the present application shall be covered by the claims of the present application.

Claims

1. A negative pressure pneumatic conveying system for rapid cooling of a powder material, characterized in that, The application relates to a negative pressure pneumatic conveying system and a method for preparing low-temperature powder. The application comprises: a powder bin for storing high-temperature powder; an air inlet cooling unit for preparing cold air with a preset low temperature; a mixer, the input pipeline of which is connected with the powder bin and the air inlet cooling unit, for mixing the high-temperature powder and the cold air, rapidly cooling the high-temperature powder by heat exchange, and obtaining cooled powder; 2. The system for rapid cooling of powder material by negative pressure pneumatic conveying according to claim 1, characterized in that, a negative pressure collector, the output pipeline of which is connected with the mixer, for collecting the cooled powder by sedimentation and filter separation, and performing secondary cooling on the cooled powder by liquid-cooled dense tubes arranged in the negative pressure collector, so as to obtain low-temperature powder. The application further comprises:

3. The system for rapid cooling of powder material by negative pressure pneumatic conveying according to claim 1, characterized in that, a bin-pump receiving port arranged at the bottom of the negative pressure collector, for opening a dust discharge valve to connect the bin-pump receiving port and discharge the low-temperature powder when the low-temperature powder reaches a preset level.

4. The system according to claim 3, wherein, Compressed air is introduced into the upper part of the negative pressure collector to spray and clean the filter material and output clean air. The application further comprises:

5. The system for rapid cooling of powder materials by negative pressure pneumatic conveying according to claim 4, characterized in that, a vacuum pump and an exhaust fan which are connected with the negative pressure collector in sequence, the vacuum pump provides negative pressure for the negative pressure collector, and the exhaust fan is used for discharging the clean air. The application further comprises:

6. The system for rapid cooling of powder material by negative pressure pneumatic conveying according to claim 1, characterized in that, a first excess pressure valve and a second excess pressure valve, the first excess pressure valve is arranged between the air inlet cooling unit and the mixer, and the second excess pressure valve is arranged between the vacuum pump and the exhaust fan, so as to maintain the pressure balance of the negative pressure pneumatic conveying system and the exhaust system. The application further comprises:

7. The system for rapid cooling of powder material by negative pressure pneumatic conveying according to claim 1, characterized in that, a variable-frequency discharge port arranged below the powder bin, which is used for adaptively adjusting the discharging speed of the powder bin according to the real-time temperature of the low-temperature powder received by the negative pressure collector.

8. The system for rapid cooling of powder materials by negative pressure pneumatic conveying according to any one of claims 1 to 7, characterized in that, The lower part of the negative pressure collector is provided with fluidization devices for uniformly outputting and cooling the cooled powder.

9. The system for rapid cooling of powder materials by negative pressure pneumatic conveying according to any one of claims 1 to 7, characterized in that, The liquid-cooled dense tubes are provided with flowing cooling liquid.

10. The system for rapid cooling of powder material by negative pressure pneumatic conveying according to any one of claims 1 to 7, characterized in that, The pipeline is a seamless steel pipe, and the inner lining of the seamless steel pipe is a ceramic wear-resistant part. The lower end of the negative pressure collector is further provided with an abnormal discharge port.

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