Positive pressure pneumatic conveying system

Abstract

The utility model relates to a positive pressure pneumatic conveying system. The positive pressure pneumatic conveying system comprises an air storage tank, a sending tank, an air inlet pipeline, a first pressure transmitter, a first temperature transmitter, a second pressure transmitter and a second temperature transmitter. A first air inlet valve is arranged on the air inlet pipeline. And the outlet end of the gas inlet pipeline is communicated with the sending tank. The inlet end of the gas inlet pipeline communicates with the gas storage tank so that gas in the gas storage tank can be led into the sending tank. The first pressure transmitter is connected to the gas storage tank and used for measuring the gas pressure in the gas storage tank. The first temperature transmitter is connected to the gas storage tank and used for measuring the temperature of gas in the gas storage tank. The second pressure transmitter is connected to the sending tank and used for measuring the gas pressure in the sending tank. The second temperature transmitter is connected to the sending tank and used for measuring the temperature of the sending tank. According to the technical scheme provided by the invention, the quality of the material in the sending tank can be detected without adding an additional weighing device, the structure is simple, and the maintenance cost is low.

Description

Technical Field

[0001] The present disclosure relates to the technical field of positive pressure pneumatic conveying metering, and in particular, to a positive pressure pneumatic conveying system. Background Art

[0002] Conveying materials by a sending tank is a relatively low-cost conveying method. Currently, devices for measuring the mass of materials entering the sending tank usually adopt devices such as load cells, belt scales, screw scales, etc. Taking the load cell as an example, when using a load cell to measure the mass of materials entering the sending tank, the load cell needs to be installed on the support feet of the sending tank, and the gravity acting on the load cell is converted into a measurable output signal according to a certain ratio and then converted into the mass of the measured material. However, when measuring the mass of materials loaded into the sending tank by this method, load cells need to be installed on the support feet of each sending tank, and such a weighing method increases the conveying cost of the positive pressure pneumatic conveying system. Summary of the Utility Model

[0003] The purpose of the present disclosure is to provide a positive pressure pneumatic conveying system to reduce the metering cost of measuring the mass of materials entering the sending tank, so as to at least partially solve the related technical problems.

[0004] To achieve the above purpose, the present disclosure provides a positive pressure pneumatic conveying system. The positive pressure pneumatic conveying system includes:

[0005] An air storage tank;

[0006] A sending tank;

[0007] An intake pipeline, a first intake valve is arranged on the intake pipeline, the outlet end of the intake pipeline communicates with the sending tank, and the inlet end of the intake pipeline communicates with the air storage tank to introduce the gas in the air storage tank into the sending tank;

[0008] A first pressure transmitter, connected to the air storage tank for measuring the gas pressure in the air storage tank;

[0009] A first temperature transmitter, connected to the air storage tank for measuring the gas temperature in the air storage tank;

[0010] A second pressure transmitter, connected to the sending tank for measuring the gas pressure in the sending tank; and

[0011] A second temperature transmitter, connected to the sending tank for measuring the gas temperature in the sending tank.

[0012] Optionally, the positive pressure pneumatic conveying system further includes a gas storage pipeline, on which a second intake valve is provided, and the outlet end of the gas storage pipeline communicates with the gas storage tank for introducing gas into the gas storage tank.

[0013] Optionally, the positive pressure pneumatic conveying system further includes a gas source, which communicates with the inlet end of the gas storage pipeline for introducing gas into the gas storage pipeline.

[0014] Optionally, a flow regulating valve is further provided on the intake pipeline, and the flow regulating valve is located downstream of the intake valve.

[0015] Optionally, a pressure stabilizing valve is further provided on the intake pipeline, and the pressure stabilizing valve is located upstream of the intake valve.

[0016] Optionally, the positive pressure pneumatic conveying system further includes a feed pipeline, on which a feed valve is provided, and the outlet end of the feed pipeline communicates with the sending tank for introducing materials into the sending tank.

[0017] Optionally, the positive pressure pneumatic conveying system further includes a hopper, which communicates with the inlet end of the feed pipeline for introducing materials into the feed pipeline.

[0018] Optionally, the positive pressure pneumatic conveying system further includes a discharge pipeline, on which a discharge valve is provided, and the inlet end of the discharge pipeline communicates with the sending tank for conveying the materials in the sending tank to the conveying pipeline.

[0019] Optionally, the positive pressure pneumatic conveying system further includes an exhaust pipeline, on which an exhaust valve is provided, and the inlet end of the exhaust pipeline communicates with the sending tank for discharging the gas in the sending tank.

[0020] Optionally, the positive pressure pneumatic conveying system further includes a level gauge, which is connected to the sending tank.

[0021] Through the above technical solution, i.e., the positive pressure pneumatic conveying system, the quality of the material in the sending tank is detected by using the gas that is introduced into the inside of the sending tank and used to convey the material to the conveying pipeline. Specifically, first, the material is introduced into the sending tank. After the feeding is completed, the sending tank is sealed. Then, the gas in the gas storage tank is stably conveyed into the sending tank through the air inlet pipeline. The first pressure transmitter and the first temperature transmitter can accurately measure the gas quality of the initial gas storage and the remaining gas storage in the gas storage tank. The difference between the gas quality of the initial gas storage and the gas quality of the remaining gas storage is the gas quality of the conveying gas conveyed into the sending tank. Further, the second pressure transmitter and the second temperature transmitter can accurately measure the gas pressure and gas temperature in the sending tank after the fluidization of the charging gas is completed. Further, the density value of the gas in the sending tank after the fluidization of the charging gas is completed can be obtained. Dividing the above-mentioned conveying gas quality by this density value can obtain the volume value of the gas conveyed into the sending tank. Since the total volume value of the sending tank is known, the volume value of the material in the sending tank can be obtained by the difference between the total volume value of the sending tank and the volume value of the gas conveyed into the sending tank. Further, since the density value of the material is known, the mass of the material in the sending tank can be obtained by multiplying the volume value of the material in the sending tank and the density value of the material, thus completing the detection of the mass of the material in the sending tank.

[0022] Thus, the technical solution provided by the present disclosure can complete the detection of the mass of the material in the sending tank without adding an additional weighing device, has a simple structure, low maintenance cost, strong practicability, and high detection accuracy.

[0023] Other features and advantages of the present disclosure will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings are used to provide a further understanding of the present disclosure, and constitute a part of the specification. Together with the following specific implementation, they are used to explain the present disclosure, but do not constitute a limitation to the present disclosure. In the drawings:

[0025] Figure 1 is a schematic diagram of the positive pressure pneumatic conveying system provided by an embodiment of the present disclosure.

[0026] DESCRIPTION OF THE REFERENCE NUMERALS

[0027] 100, positive pressure pneumatic conveying system;

[0028] 1, gas storage tank; 11, first pressure transmitter; 12, first temperature transmitter;

[0029] 2, sending tank; 21, level gauge; 22, second pressure transmitter; 23, second temperature transmitter;

[0030] 3, gas source;

[0031] 4. Gas storage pipeline; 41. Second intake valve;

[0032] 5. Intake pipeline; 51. First intake valve; 52. Flow regulating valve; 53. Pressure stabilizing valve;

[0033] 6. Exhaust pipeline; 61. Exhaust valve;

[0034] 7. Feed pipeline; 71. Feed valve; 72. Hopper;

[0035] 8. Discharge pipeline; 81. Discharge valve. Detailed implementation manners

[0036] The following will describe in detail the detailed implementation manners of the present disclosure with reference to the accompanying drawings. It should be understood that the detailed implementation manners described herein are only used to illustrate and explain the present disclosure, and are not used to limit the present disclosure.

[0037] In the present disclosure, it should be noted that the terms such as "first, second" are used to distinguish one element from another element.

[0038] According to one aspect of the present disclosure, as Figure 1 shown, a positive pressure pneumatic conveying system 100 is provided. The positive pressure pneumatic conveying system 100 may include a gas storage tank 1, a sending tank 2, an intake pipeline 5, a first pressure transmitter 11, a first temperature transmitter 12, a second pressure transmitter 22, and a second temperature transmitter 23. Among them, a first intake valve 51 may be provided on the intake pipeline 5. The outlet end of the intake pipeline 5 communicates with the sending tank 2. The inlet end of the intake pipeline 5 communicates with the gas storage tank 1 to introduce the gas in the gas storage tank 1 into the sending tank 2. The first pressure transmitter 11 is connected to the gas storage tank 1 to measure the gas pressure in the gas storage tank 1. The first temperature transmitter 12 is connected to the gas storage tank 1 to measure the gas temperature in the gas storage tank 1. The second pressure transmitter 22 is connected to the sending tank 2 to measure the gas pressure in the sending tank 2. The second temperature transmitter 23 is connected to the sending tank 2 to measure the temperature of the sending tank 2.

[0039] Through the above technical solution, that is, the positive pressure pneumatic conveying system 100, the quality of the material in the sending tank 2 is detected by using the gas introduced into the sending tank 2 for conveying the material to the conveying pipeline. Specifically, first, the material is introduced into the sending tank 2. After the feeding is completed, the sending tank 2 is sealed. Then, the gas in the gas storage tank 1 is stably conveyed into the sending tank 2 through the air inlet pipeline 5. The first pressure transmitter 11 and the first temperature transmitter 12 can accurately measure the gas quality of the initial gas storage and the remaining gas storage in the gas storage tank 1. The difference between the gas quality of the initial gas storage and the gas quality of the remaining gas storage is the gas quality of the conveying gas conveyed into the sending tank 2. Further, the second pressure transmitter 22 and the second temperature transmitter 23 can accurately measure the gas pressure and gas temperature in the sending tank 2 after the fluidization of the charging gas is completed. Further, the density value of the gas in the sending tank 2 after the fluidization of the charging gas is completed can be obtained. Dividing the above-mentioned conveying gas quality by this density value can obtain the volume value of the gas conveyed into the sending tank 2. Since the total volume value of the sending tank 2 is known, the volume value of the material in the sending tank 2 can be obtained by the difference between the total volume value of the sending tank 2 and the volume value of the gas conveyed into the sending tank 2. Further, since the density value of the material is known, the mass of the material in the sending tank 2 can be obtained by multiplying the volume value of the material in the sending tank 2 and the density value of the material, thus completing the detection of the mass of the material in the sending tank 2.

[0040] Thus, the technical solution provided by the present disclosure can complete the detection of the mass of the material in the sending tank 2 without adding an additional weighing device, has a simple structure, low maintenance cost, strong practicability, and high detection accuracy.

[0041] In some embodiments, as Figure 1 shown, the positive pressure pneumatic conveying system 100 may further include a gas storage pipeline 4. A second intake valve 41 is provided on the gas storage pipeline 4. The outlet end of the gas storage pipeline 4 communicates with the gas storage tank 1 for introducing gas into the gas storage tank 1. The setting of the gas storage pipeline 4 can reliably achieve the purpose of storing gas in the gas storage tank 1.

[0042] In some embodiments, as Figure 1 shown, the positive pressure pneumatic conveying system 100 may further include a gas source 3. The gas source 3 communicates with the inlet end of the gas storage pipeline 4 for introducing gas into the gas storage pipeline 4. The gas source 3 can communicate with the gas storage tank 1 through the gas storage pipeline 4 to introduce gas into the gas storage tank 1.

[0043] In some embodiments, as Figure 1 shown, a flow regulating valve 52 may further be provided on the air inlet pipeline 5. The flow regulating valve 52 is located downstream of the first intake valve 51. The setting of the flow regulating valve 52 can facilitate the control of the flow rate of the gas conveyed from the gas storage tank 1 to achieve the purpose of conveying a set amount of gas into the sending tank 2.

[0044] In some embodiments, as Figure 1 shown, a pressure stabilizing valve 53 may further be provided on the intake pipe 5. The pressure stabilizing valve 53 is located upstream of the first intake valve 51. The setting of the pressure stabilizing valve 53 can ensure that the gas output from the gas storage tank 1 is stably and reliably introduced into the sending tank 2, avoiding the problem that the measurement result is inaccurate due to the sudden increase or decrease of the gas pressure transmission pressure.

[0045] In some embodiments, as Figure 1 described, the positive pressure pneumatic conveying system 100 may further include a feed pipe 7. A feed valve 71 may be provided on the feed pipe 7. The outlet end of the feed pipe 7 communicates with the sending tank 2 for introducing materials into the sending tank 2. The setting of the feed pipe 7 can reliably achieve the purpose of introducing materials into the sending tank 2.

[0046] In some embodiments, as Figure 1 shown, the positive pressure pneumatic conveying system 100 may further include a hopper 72. The hopper 72 communicates with the inlet end of the feed pipe 7 for introducing materials into the feed pipe 7. The setting of the hopper 72 can achieve the continuous and reliable conveying of materials into the feed pipe 7.

[0047] In some embodiments, as Figure 1 shown, the positive pressure pneumatic conveying system 100 may further include a discharge pipe 8. A discharge valve 81 may be provided on the discharge pipe 8. The inlet end of the discharge pipe 8 communicates with the sending tank 2 for conveying the materials in the sending tank 2 to the conveying pipeline. The setting of the discharge pipe 8 can reliably achieve the purpose of conveying the materials in the sending tank 2 after the aeration and fluidization are completed to the conveying pipeline. For example, the conveying pipeline may be a belt conveyor, a conveying roller, etc., which is not limited herein, and those skilled in the art can design and adjust according to the actual situation.

[0048] In some embodiments, as Figure 1 shown, the positive pressure pneumatic conveying system 100 may further include an exhaust pipe 6. An exhaust valve 61 may be provided on the exhaust pipe 6. The inlet end of the exhaust pipe 6 communicates with the sending tank 2 for discharging the gas in the sending tank 2. The setting of the exhaust pipe 6 can reliably achieve the purpose of discharging the gas in the sending tank 2.

[0049] In some embodiments, the positive pressure pneumatic conveying system 100 may further include a level gauge 21. The level gauge 21 is connected to the sending tank 2. The setting of the level gauge 21 can measure the height of the materials in the sending tank 2, ensuring the safe and stable supply of the materials in the sending tank 2.

[0050] To enable those skilled in the art to better understand the working principle of the positive pressure pneumatic conveying system 100 in this application, the working principle of the positive pressure pneumatic conveying system 100 will be described in detail below in combination with the above-mentioned various pipelines and valves:

[0051] The positive pressure pneumatic conveying system 100 is used to convey a set mass of materials in the sending tank 2 to the conveying pipeline through positive pressure gas. During the feeding process, the feeding valve 71 on the feeding pipeline 7 is opened and the exhaust valve 61 on the exhaust pipeline 6 is opened. The materials can be added into the sending tank 2 through the hopper 72, and the displaced air is released through the exhaust pipeline 6. Such a feeding method makes feeding easier and also eliminates the reverse pressure that hinders the flow of materials.

[0052] When the sending tank 2 is filled, the feeding valve 71 and the exhaust valve 61 can be closed to seal the sending tank 2. Then the first intake valve 51 on the intake pipeline 5 is opened to lead the gas in the gas storage tank 1 into the sending tank 2. The gas added into the sending tank 2 is mixed with the materials to achieve the purpose of fluidizing the materials by charging. When the pressure in the sending tank 2 reaches the set value, the discharge valve 81 on the discharge pipeline 8 is opened, and the materials can be conveyed in the form of a plunger in the conveying pipeline until the materials are emptied. Among them, the pressure stabilizing valve 53 on the intake pipeline 5 upstream of the first intake valve 51 can stably convey the gas from the gas storage tank 1 into the sending tank 2, and the flow regulating valve 52 on the intake pipeline 5 downstream of the first intake valve 51 can facilitate the control of the flow rate of the gas conveyed into the sending tank 2.

[0053] It should be noted that before conveying gas to the sending tank 2, the second intake valve 41 on the gas storage pipeline 4 can also be opened to achieve the purpose of storing gas from the gas source 3 into the gas storage tank 1.

[0054] The above-described content is the entire working process of the positive pressure pneumatic conveying system 100. It should be noted that in this application, the mass of the materials in the sending tank 2 is obtained by the method of inflation measurement. Without the need to add an additional weighing device, the detection of the mass of the materials in the sending tank 2 can be completed. The structure is simple, the maintenance cost is low, the practicability is strong, and the detection accuracy is high. Among them, the method of inflation measurement itself is relatively conventional and can be obtained by using some existing conversion formulas between volume, mass, and density. This application does not involve improvements in methods, but on the positive pressure pneumatic conveying system 100, by adding a gas storage tank 1, a first temperature transmitter 12, a first pressure transmitter 11, a second temperature transmitter 23, and a second pressure transmitter 22, the mass of the materials in the sending tank 2 is obtained by the method of inflation measurement.

[0055] The present disclosure exemplarily provides an implementation manner for obtaining the mass of materials through inflation measurement. The following will specifically describe in detail the measurement process for detecting the mass of materials in the present application in combination with the above working process:

[0056] Through the gas storage pipeline 4, the gas in the gas source 3 is transported to the gas storage tank 1. The first gas pressure P1 and the first gas temperature T1 in the gas storage tank 1 after the initial gas storage is completed can be obtained through the first pressure transmitter 11 and the first temperature transmitter 12 connected to the gas storage tank 1. Through the first gas pressure P1 and the first gas temperature T1, the gas mass of the initial gas storage can be obtained,

[0057] That is: M 初始储气 =V 储气罐 ×ρ1 = V 储气罐 ×(P1 / R*T1);

[0058] Wherein, V 储气罐 is a known quantity, and R is the specific gas constant;

[0059] Further, materials are introduced into the sending tank 2 through the feed pipeline 7;

[0060] Further, through the gas inlet pipeline 5, the gas in the gas storage tank 1 is transported to the sending tank 2. The second gas pressure P2 and the second gas temperature T2 of the remaining gas storage in the gas storage tank 1 after the gas transportation is completed can be obtained through the first pressure transmitter 11 and the first temperature transmitter 12 connected to the gas storage tank 1. Through the second gas pressure P2 and the second gas temperature T2, the gas mass of the remaining gas storage can be obtained,

[0061] That is: M 剩余储气 =V 储气罐 ×ρ2 = V 储气罐 ×(P2 / R*T2);

[0062] Wherein, V 储气罐 is a known quantity, and R is the specific gas constant;

[0063] Further, through the difference between the gas mass of the initial gas storage and the gas mass of the remaining gas storage, the gas mass transported into the sending tank 2 can be obtained,

[0064] M 输送储气 =M 初始储气 -M 剩余储气

[0065] =V 储气罐 ×(P1 / R*T1)-V 储气罐 ×(P2 / R*T2);

[0066] That is:

[0067] Further, by connecting the second pressure transmitter 22 and the second temperature transmitter 23 of the sending tank 2, the third gas pressure P3 and the third gas temperature T3 in the sending tank 2 after inflation can be obtained. The density ρ3 of the third gas can be obtained from the third gas pressure P3 and the third gas temperature T3,

[0068] i.e., ρ3 = P3 / R * T3;

[0069] where R is the specific gas constant;

[0070] Further, through M 输送储气 and the third gas density ρ3, the volume of the gas transported into the sending tank 2 can be obtained.

[0071] V 输送储气 = M 输送储气 / ρ3

[0072] i.e., = M 输送储气 / (P3 / R * T3);

[0073] Further, since the total volume V 发送罐 of the sending tank 2 is known, then by taking the difference between the total volume V 发送罐 of the sending tank 2 and the volume V 输送储气 of the gas transported into the sending tank 2, the volume of the material in the sending tank 2 can be obtained.

[0074] i.e., V 物料 = V 发送罐 - V 输送储气 ;

[0075] Further, since the density ρ4 of the material is known, then by multiplying the volume of the material in the sending tank 2 by the density of the material, the mass of the material in the sending tank 2 can be obtained.

[0076] i.e., M 物料 = V 物料 *ρ4.

[0077] The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0078] In addition, it should be noted that in the above specific embodiments, the various specific technical features described can be combined in any suitable manner without conflict. To avoid unnecessary repetition, the present disclosure will not separately describe various possible combination manners.

[0079] In addition, any combination can be made among various different embodiments of the present disclosure, as long as it does not violate the idea of the present disclosure, and it should also be regarded as the content disclosed by the present disclosure.

Claims

1. A positive pressure pneumatic conveying system, characterized in that, Comprising: Gas storage tank; Sending tank; An intake pipeline, on which a first intake valve is provided, the outlet end of the intake pipeline is communicated with the sending tank, and the inlet end of the intake pipeline is communicated with the gas storage tank to introduce the gas in the gas storage tank into the sending tank; A first pressure transmitter, connected to the gas storage tank for measuring the gas pressure in the gas storage tank; A first temperature transmitter, connected to the gas storage tank for measuring the gas temperature in the gas storage tank; A second pressure transmitter, connected to the sending tank for measuring the gas pressure in the sending tank; and A second temperature transmitter, connected to the sending tank for measuring the gas temperature of the sending tank.

2. The positive pressure pneumatic conveying system according to claim 1, wherein, The positive pressure pneumatic conveying system further includes a gas storage pipeline, on which a second intake valve is provided, and the outlet end of the gas storage pipeline is communicated with the gas storage tank for introducing gas into the gas storage tank.

3. The positive pressure pneumatic conveying system according to claim 2, wherein, The positive pressure pneumatic conveying system further includes a gas source, which is communicated with the inlet end of the gas storage pipeline for introducing gas into the gas storage pipeline.

4. The positive pressure pneumatic conveying system according to claim 1, wherein A flow regulating valve is further provided on the intake pipeline, and the flow regulating valve is located downstream of the first intake valve.

5. The positive pressure pneumatic conveying system according to claim 1, wherein A pressure stabilizing valve is further provided on the intake pipeline, and the pressure stabilizing valve is located upstream of the first intake valve.

6. The positive pressure pneumatic conveying system according to claim 1, wherein, The positive pressure pneumatic conveying system further includes a feed pipeline, on which a feed valve is provided, and the outlet end of the feed pipeline is communicated with the sending tank for introducing materials into the sending tank.

7. The positive pressure pneumatic conveying system according to claim 6, characterized in that, The positive pressure pneumatic conveying system further includes a hopper, which is communicated with the inlet end of the feed pipeline for introducing materials into the feed pipeline.

8. The positive pressure pneumatic conveying system according to claim 1, wherein, The positive pressure pneumatic conveying system further includes a discharge pipeline, on which a discharge valve is provided, and the inlet end of the discharge pipeline is communicated with the sending tank for conveying the materials in the sending tank to the conveying pipeline.

9. The positive pressure pneumatic conveying system according to claim 1, wherein The positive pressure pneumatic conveying system further includes an exhaust pipeline, on which an exhaust valve is provided, and the inlet end of the exhaust pipeline is communicated with the sending tank for discharging the gas in the sending tank.

10. The positive pressure pneumatic conveying system according to claim 1, wherein The positive pressure pneumatic conveying system further includes a level gauge, which is connected to the sending tank.

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