Material conveying air ratio adjustment method and material conveying device

Abstract

The application discloses a material conveying ash-gas ratio adjusting method and a material conveying device. After each conveying is completed, step A is executed, and step A comprises the following steps: S1: obtaining an average value of a gas flow lower limit in a conveying process, comparing the average value of the gas flow lower limit with a preset gas flow lower limit value, if a deviation between the average value of the gas flow lower limit and the preset gas flow lower limit value is less than a preset deviation range, then the opening degrees of a primary gas adjusting valve and a tertiary gas adjusting valve are increased, and if the deviation between the average value of the gas flow lower limit and the preset gas flow lower limit value is greater than the preset deviation range, then the opening degrees of the primary gas adjusting valve and the tertiary gas adjusting valve are decreased. The application adjusts the gas flow in the conveying process, realizes dynamic adjustment of the ash-gas ratio, solves the system imbalance problem caused by the fact that the ash-gas ratio does not change along with the change of the material properties, and makes the material conveying device achieve an energy-saving, stable and efficient operation state.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pneumatic conveying, in particular to a material conveying air-gas ratio adjusting method and a material conveying device. BACKGROUND

[0002] Pneumatic conveying is a kind of conveying mode that utilizes the energy of gas flow to convey materials in a sealed pipeline along the direction of gas flow, which has the advantages of simple structure, strong sealing, long-distance pipeline laying, and easy automatic control, and is widely used in many industrial fields and continuously shows its potential and value.

[0003] However, pneumatic conveying involves the characteristics of gas-solid two-phase flow, and its flow state is affected by many factors. Therefore, in the design stage, the volume of the bin pump, the diameter and length of the conveying pipeline, and the positions of the variable diameter and elbow of the conveying pipeline need to be reasonably determined according to the material properties such as bulk density, particle size, shape, moisture content, and fluidization performance; at the same time, the size of the gas flow needs to be accurately calculated, and a certain margin should be considered when calculating the gas flow by considering the material properties.

[0004] In the system debugging stage, the matching of gas flow and material properties can only be based on the current material to achieve the optimal air-gas ratio under the current conditions. However, the material properties of the same material may change over time, and the material properties of different materials may also be different. If the material properties change but the gas flow is not adjusted accordingly, it may cause the air-gas ratio to increase or decrease. When the air-gas ratio increases, the conveying concentration increases, which is easy to block; when the air-gas ratio decreases, the conveying concentration is too low, which increases energy consumption.

[0005] Therefore, how to provide a material conveying air-gas ratio adjusting method and a material conveying device to realize accurate air-gas ratio adjustment, ensure stable material conveying, avoid problems such as blockage and excessive dilution, reduce energy consumption, and improve energy saving effect is a technical problem that needs to be solved by those skilled in the art. SUMMARY

[0006] The purpose of the present application is to provide a material conveying air-gas ratio adjusting method and a material conveying device to realize accurate air-gas ratio adjustment, ensure stable material conveying, avoid problems such as blockage and excessive dilution, reduce energy consumption, and improve energy saving effect.

[0007] To solve the above technical problems, the present application provides a material conveying air-gas ratio adjusting method, which comprises a primary air adjusting valve and a tertiary air adjusting valve, the primary air adjusting valve is used to adjust the primary air flow, and the tertiary air adjusting valve is used to adjust the tertiary air flow. After each conveying is completed, step A is performed, which comprises:

[0008] Step S1: obtaining the average value of the gas flow lower limit in the conveying process, comparing the average value of the gas flow lower limit with the preset gas flow lower limit value, if the deviation of the average value of the gas flow lower limit and the preset gas flow lower limit value is less than the preset deviation range, then increasing the opening of the primary gas regulating valve and the tertiary gas regulating valve, if the deviation of the average value of the gas flow lower limit and the preset gas flow lower limit value is greater than the preset deviation range, then decreasing the opening of the primary gas regulating valve and the tertiary gas regulating valve.

[0009] The preset gas flow lower limit value and the preset deviation range are determined according to the material properties of the material in the system debugging stage, if the deviation of the average value of the gas flow lower limit and the preset gas flow lower limit value is within the preset deviation range, it indicates that the material properties have not changed or have changed slightly compared with the system debugging stage, and the current ash-gas ratio of the material conveying device has not changed or has changed slightly compared with the system debugging stage, at this time, the gas flow in the conveying process meets the demand, and there is no need to adjust the opening of the primary gas regulating valve and the tertiary gas regulating valve; if the deviation of the average value of the gas flow lower limit and the preset gas flow lower limit value is less than the preset deviation range, it indicates that the material properties have changed compared with the system debugging stage, and the current ash-gas ratio of the material conveying device is small, which leads to too low conveying concentration and increases energy consumption, at this time, the gas flow in the conveying process is lower than the demand, therefore, it is necessary to increase the opening of the primary gas regulating valve and the tertiary gas regulating valve to improve the gas flow in the conveying process, so that the ash-gas ratio of the material conveying device returns to the optimal ash-gas ratio; if the deviation of the average value of the gas flow lower limit and the preset gas flow lower limit value is greater than the preset deviation range, it indicates that the material properties have changed compared with the system debugging stage, and the current ash-gas ratio of the material conveying device is large, which leads to high conveying concentration and easy blockage, at this time, the gas flow in the conveying process is higher than the demand, therefore, it is necessary to decrease the opening of the primary gas regulating valve and the tertiary gas regulating valve to improve the gas flow in the conveying process, so that the ash-gas ratio of the material conveying device returns to the optimal ash-gas ratio.

[0010] It can be seen that the material conveying ash-gas ratio adjustment method of the embodiment adjusts the gas flow in the conveying process to realize dynamic adjustment of the ash-gas ratio, solves the problem of system imbalance caused by the change of the material properties and the failure of the ash-gas ratio to follow the change, adjusts the ash-gas ratio according to the change of the material properties, avoids problems such as high conveying concentration, easy blockage and insufficient output caused by large ash-gas ratio, and avoids problems such as low conveying concentration, large energy consumption and large pipeline wear caused by small ash-gas ratio, effectively controls the conveying time, and makes the material conveying device achieve the state of energy saving, stability and high efficiency.

[0011] Optionally, the step A further comprises:

[0012] Step S01: obtaining an average value of the upper limit of the gas flow during the conveying process, comparing the average value of the upper limit of the gas flow with a preset upper limit of the gas flow, if the average value of the upper limit of the gas flow is greater than the preset upper limit of the gas flow, the preset deviation range is -a%~b%; if the average value of the upper limit of the gas flow is less than the preset upper limit of the gas flow, the preset deviation range is -c%~d%.

[0013] Optionally, an average value of the lower limit of the gas flow during the conveying process is obtained, specifically including the following steps:

[0014] obtaining a conveying pressure curve and a gas flow curve during the conveying process, and arranging pressure values between the preset upper limit of the pressure and the preset lower limit of the pressure in the conveying pressure curve in time sequence to form a pressure upper limit time column;

[0015] selecting the gas flow corresponding to each time point in the pressure upper limit time column on the gas flow curve, and arranging the gas flow in time sequence to form a gas flow lower limit time column;

[0016] calculating the average value of the lower limit of the gas flow according to each gas flow in the gas flow lower limit time column.

[0017] Optionally, an average value of the upper limit of the gas flow during the conveying process is obtained, specifically including the following steps:

[0018] obtaining a conveying pressure curve and a gas flow curve during the conveying process, and arranging pressure values less than the preset lower limit of the pressure in the conveying pressure curve in time sequence to form a pressure lower limit time column;

[0019] selecting the gas flow corresponding to each time point in the pressure lower limit time column on the gas flow curve, and arranging the gas flow in time sequence to form a gas flow upper limit time column;

[0020] calculating the average value of the upper limit of the gas flow according to each gas flow in the gas flow upper limit time column.

[0021] Optionally, the gas flow curve is obtained, specifically including the following steps:

[0022] obtaining a first gas flow curve and a third gas flow curve, and superimposing the first gas flow curve and the third gas flow curve to form the gas flow curve.

[0023] Optionally, the first gas flow curve is obtained by detecting the first gas flow of the material conveying device in the conveying process in real time through a first gas flow meter;

[0024] and / or, the third gas flow curve is obtained by detecting the third gas flow of the material conveying device in the conveying process in real time through a third gas flow meter.

[0025] Optionally, the regulating step of the primary gas regulating valve and the tertiary gas regulating valve is K, and the opening ratio of the primary gas regulating valve and the tertiary gas regulating valve is X,

[0026] When the deviation of the average value of the lower limit of the gas flow from the preset lower limit of the gas flow is less than the preset deviation range, the opening of the tertiary gas regulating valve is increased by K*X, and the opening of the primary gas regulating valve is increased by K*(1-X).

[0027] When the deviation of the average value of the lower limit of the gas flow from the preset lower limit of the gas flow is greater than the preset deviation range, the opening of the tertiary gas regulating valve is decreased by K*X, and the opening of the primary gas regulating valve is decreased by K*(1-X).

[0028] Optionally, the conveying pressure curve of the material conveying device in the conveying process is obtained by detecting the conveying pressure in real time through a pressure transmitter.

[0029] The application further provides a material conveying device suitable for the material conveying ash-gas ratio adjusting method.

[0030] The bin pump has a discharge port, a primary gas inlet and a tertiary gas inlet.

[0031] The primary gas regulating valve and the primary gas flow meter are connected with each other.

[0032] The tertiary gas regulating valve and the tertiary gas flow meter are connected with each other.

[0033] The pressure transmitter is connected with the discharge port.

[0034] The material conveying device is suitable for the material conveying ash-gas ratio adjusting method, and has the same technical effects as the material conveying ash-gas ratio adjusting method, which will not be described herein.

[0035] Optionally, the primary gas inlet valve and the tertiary gas inlet valve are further included, the primary gas inlet valve is connected between the primary gas inlet and the primary gas regulating valve, and the tertiary gas inlet valve is connected between the tertiary gas inlet and the tertiary gas regulating valve. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 FIG. 1 is a structural schematic diagram of a specific embodiment of the material conveying device provided in the application;

[0037] In the drawings, Figure 1 The reference signs in the drawings are explained as follows:

[0038] 1 - bin pump; 2 - primary air regulating valve; 3 - primary air flow meter; 4 - tertiary air regulating valve; 5 - tertiary air flow meter; 6 - pressure transmitter; 7 - primary air inlet valve; 8 - tertiary air inlet valve; 9 - feed valve; 10 - discharge valve; 11 - level meter. DETAILED DESCRIPTION

[0039] In order to make the technical personnel in the art better understand the technical solutions of the present application, the present application will be further described in detail below in combination with the drawings and specific embodiments.

[0040] The "multiple" described herein is generally two or more; and when using "multiple" to represent the number of several components, it does not represent the mutual relationship of the number of components.

[0041] The embodiment provides a material conveying air ratio adjustment method, and the material conveying device comprises a primary air regulating valve and a tertiary air regulating valve. The primary air regulating valve is used for adjusting the primary air flow, and the tertiary air regulating valve is used for adjusting the tertiary air flow. After each conveying is completed, step A is executed. Step A comprises the following steps.

[0042] Step S1: acquiring an average value of the air flow lower limit in the conveying process, comparing the average value of the air flow lower limit with a preset air flow lower limit value, if the deviation of the average value of the air flow lower limit and the preset air flow lower limit value is less than a preset deviation range, then increasing the opening of the primary air regulating valve and the tertiary air regulating valve, if the deviation of the average value of the air flow lower limit and the preset air flow lower limit value is greater than the preset deviation range, then reducing the opening of the primary air regulating valve and the tertiary air regulating valve.

[0043] The preset gas flow lower limit value and the preset deviation range are determined according to the material properties of the material during the system debugging stage. If the deviation between the average value of the gas flow lower limit and the preset gas flow lower limit value is within the preset deviation range, it indicates that the material properties have not changed or have changed slightly compared with the system debugging stage, and the current ash-gas ratio of the material conveying device has not changed or has changed slightly compared with the system debugging stage. At this time, the gas flow during the conveying process meets the requirements, and the opening of the primary gas regulating valve and the tertiary gas regulating valve does not need to be adjusted. If the deviation between the average value of the gas flow lower limit and the preset gas flow lower limit value is less than the preset deviation range, it indicates that the material properties have changed compared with the system debugging stage, and the current ash-gas ratio of the material conveying device is small, resulting in a too low conveying concentration and increased energy consumption. At this time, the gas flow during the conveying process is lower than the requirements, and therefore, the opening of the primary gas regulating valve and the tertiary gas regulating valve needs to be increased to increase the gas flow during the conveying process, so that the ash-gas ratio of the material conveying device returns to the optimal ash-gas ratio. If the deviation between the average value of the gas flow lower limit and the preset gas flow lower limit value is greater than the preset deviation range, it indicates that the material properties have changed compared with the system debugging stage, and the current ash-gas ratio of the material conveying device is large, resulting in an increased conveying concentration and easy blockage. At this time, the gas flow during the conveying process is higher than the requirements, and therefore, the opening of the primary gas regulating valve and the tertiary gas regulating valve needs to be reduced to increase the gas flow during the conveying process, so that the ash-gas ratio of the material conveying device returns to the optimal ash-gas ratio.

[0044] It can be seen that the material conveying ash-gas ratio adjustment method of the embodiment adjusts the gas flow during the conveying process to realize dynamic adjustment of the ash-gas ratio, solves the problem of system imbalance caused by changes in material properties without changes in the ash-gas ratio, adjusts the ash-gas ratio according to changes in material properties, avoids problems such as high conveying concentration, easy blockage, and insufficient output caused by a large ash-gas ratio, and avoids problems such as low conveying concentration, large energy consumption, and large pipeline wear caused by a small ash-gas ratio, effectively controls the conveying time, and makes the material conveying device achieve an energy-saving, stable, and efficient operating state.

[0045] The deviation between the average value of the gas flow lower limit and the preset gas flow lower limit value is less than the preset deviation range, which means that the deviation between the average value of the gas flow lower limit and the preset gas flow lower limit value is less than the lower limit value of the preset deviation range. The deviation between the average value of the gas flow lower limit and the preset gas flow lower limit value is greater than the preset deviation range, which means that the deviation between the average value of the gas flow lower limit and the preset gas flow lower limit value is greater than the upper limit value of the preset deviation range.

[0046] Further, in the material conveying ash-gas ratio adjustment method of the embodiment, step A further includes the following before step S1:

[0047] Step S01: obtaining the upper limit average value of the gas flow in the conveying process, comparing the upper limit average value of the gas flow with the preset upper limit value of the gas flow, if the upper limit average value of the gas flow is greater than the preset upper limit value of the gas flow, the preset deviation range is -a%~b%; if the upper limit average value of the gas flow is less than the preset upper limit value of the gas flow, the preset deviation range is -c%~d%.

[0048] The preset upper limit value of the gas flow is determined according to the material properties in the system debugging stage. If the upper limit average value of the gas flow is greater than the preset upper limit value of the gas flow, it represents that the air load value is large, and the lower limit average value of the gas flow is adjusted in the range of -a%~b%; if the upper limit average value of the gas flow is less than the preset upper limit value of the gas flow, it represents that the air load value is large, and the lower limit average value of the gas flow is adjusted in the range of -c%~d%. The specific values of a, b, c and d can be determined according to the engineering practice, and generally a>c and b>d.

[0049] Further, in the material conveying gas ratio adjustment method of the embodiment, the lower limit average value of the gas flow in the conveying process is obtained, which specifically includes the following steps:

[0050] The conveying pressure curve and the gas flow curve in the conveying process are obtained, the pressure values in the conveying pressure curve between the preset upper limit value and the preset lower limit value of the pressure are sorted in time sequence to form a pressure upper limit time column;

[0051] The gas flow corresponding to each time point in the pressure upper limit time column is selected on the gas flow curve, and the gas flow is sorted in time sequence to form a gas flow lower limit time column;

[0052] The lower limit average value of the gas flow is calculated according to each gas flow in the gas flow lower limit time column.

[0053] The conveying pressure of the material conveying device in the conveying process can be detected in real time by a pressure transmitter, so as to obtain the conveying pressure curve.

[0054] The primary gas flow of the material conveying device in the conveying process can be detected in real time by a primary gas flow meter, so as to obtain a primary gas flow curve. The tertiary gas flow of the material conveying device in the conveying process can be detected in real time by a tertiary gas flow meter, so as to obtain a tertiary gas flow curve. The primary gas flow curve and the tertiary gas flow curve are superimposed to form the gas flow curve.

[0055] The preset pressure upper limit value and the preset pressure lower limit value are determined according to the material property in the system debugging stage. When the conveying pressure is between the preset pressure upper limit value and the preset pressure lower limit value, it indicates that the material conveying device is in a normal conveying state. Therefore, the pressure values in the conveying pressure curve between the preset pressure upper limit value and the preset pressure lower limit value are intercepted and sorted in time sequence to form a pressure upper limit time column. It can be understood that in pneumatic conveying, a high conveying pressure indicates a small corresponding air flow. Therefore, the air flow corresponding to each time point in the pressure upper limit time column is selected on the air flow curve, and the air flow is sorted in time sequence to obtain an air flow lower limit time column. The air flow lower limit average value can be calculated according to the air flow in the air flow lower limit time column.

[0056] Further, in the material conveying air-gas ratio adjustment method of the embodiment, the air flow upper limit average value in the conveying process is obtained, specifically including the following steps:

[0057] The conveying pressure curve and the air flow curve in the conveying process are obtained, and the pressure values less than the preset pressure lower limit value in the conveying pressure curve are sorted in time sequence to form a pressure lower limit time column.

[0058] The air flow corresponding to each time point in the pressure lower limit time column is selected on the air flow curve, and the air flow is sorted in time sequence to form an air flow upper limit time column.

[0059] The air flow upper limit average value is calculated according to the air flow in the air flow upper limit time column.

[0060] As described above, the conveying pressure of the material conveying device in the conveying process can be detected in real time by a pressure transmitter, so as to obtain the conveying pressure curve.

[0061] As described above, the primary air flow of the material conveying device in the conveying process can be detected in real time by a primary air flow meter, so as to obtain a primary air flow curve. The tertiary air flow of the material conveying device in the conveying process can be detected in real time by a tertiary air flow meter, so as to obtain a tertiary air flow curve. The primary air flow curve and the tertiary air flow curve are superimposed to form the air flow curve.

[0062] As described above, the preset pressure lower limit value is determined according to the material property in the system debugging stage. The pressure values less than the preset pressure lower limit value in the conveying pressure curve are sorted in time sequence to form a pressure lower limit time column. It can be understood that in pneumatic conveying, a low conveying pressure indicates a high corresponding air flow. Therefore, the air flow corresponding to each time point in the pressure lower limit time column is selected on the air flow curve, and the air flow is sorted in time sequence to obtain an air flow upper limit time column. The air flow upper limit average value can be calculated according to the air flow in the air flow upper limit time column.

[0063] Further, in the embodiment, the adjustment step of the primary gas adjusting valve and the tertiary gas adjusting valve is K, and the opening degree ratio of the primary gas adjusting valve and the tertiary gas adjusting valve is X,

[0064] When the deviation of the average value of the lower limit of the gas flow rate from the preset lower limit of the gas flow rate is less than the preset deviation range, the opening degree of the tertiary gas adjusting valve is increased by K*X, and the opening degree of the primary gas adjusting valve is increased by K*(1-X).

[0065] When the deviation of the average value of the lower limit of the gas flow rate from the preset lower limit of the gas flow rate is greater than the preset deviation range, the opening degree of the tertiary gas adjusting valve is decreased by K*X, and the opening degree of the primary gas adjusting valve is decreased by K*(1-X).

[0066] As described above, the opening degree ratio X of the primary gas adjusting valve and the tertiary gas adjusting valve is obtained through debugging or model calculation, and the opening degree ratio X represents a state of stable conveying and energy saving. On the basis of the state of stable conveying and energy saving, the application further dynamically optimizes the gas flow rate, and further adjusts the ash-gas ratio in real time to ensure optimal conveying each time.

[0067] The application also provides a material conveying device suitable for the material conveying ash-gas ratio adjusting method.

[0068] The bin pump 1 is used for containing material inside, and has a discharge port, a primary gas inlet, and a tertiary gas inlet.

[0069] The primary gas adjusting valve 2 and the primary gas flow meter 3 are connected with the primary gas inlet, and the primary gas adjusting valve 2 is used for adjusting the flow rate of the primary gas, and the primary gas flow meter 3 is connected with the primary gas adjusting valve 2 and is used for detecting the flow rate of the primary gas in real time.

[0070] The tertiary gas adjusting valve 4 and the tertiary gas flow meter 5 are connected with the tertiary gas inlet, and the tertiary gas adjusting valve 4 is used for adjusting the flow rate of the tertiary gas, and the tertiary gas flow meter 5 is connected with the tertiary gas adjusting valve 4 and is used for detecting the flow rate of the tertiary gas in real time.

[0071] The pressure transmitter 6 is connected with the discharge port and is used for detecting the conveying pressure.

[0072] The material conveying device of the application is suitable for the material conveying ash-gas ratio adjusting method, and thus has the same technical effects as the material conveying ash-gas ratio adjusting method, which will not be described herein.

[0073] Further, the bin pump 1 also has a feeding port, and the material conveying device further comprises a feeding valve 9 connected with the feeding port, and the feeding valve 9 is used for opening the feeding port when feeding is needed or closing the feeding port after feeding is completed.

[0074] The material conveying device further comprises a material level meter 11 arranged at a position close to the upper end of the bin pump 1, which is used to detect the material height in the bin pump 1.

[0075] In practice, the material conveying device further comprises a controller, the material level meter 11 and the feeding valve 9 are electrically connected to the controller, and the controller can control the feeding valve 9 to close the feeding port and end the feeding, on the condition that the material level meter 11 detects that the feeding amount reaches 80% of the volume of the bin pump 1.

[0076] The material conveying device further comprises a primary gas inlet valve 7 and a tertiary gas inlet valve 8, the primary gas inlet valve 7 is connected between the primary gas inlet port and the primary gas regulating valve 2, and the tertiary gas inlet valve 8 is connected between the tertiary gas inlet port and the tertiary gas regulating valve 4.

[0077] In this way, the primary gas inlet valve 7 can be used to open or close the primary gas inlet port, and the tertiary gas inlet valve 8 can be used to open or close the tertiary gas inlet port, in the gas inlet stage, the primary gas inlet valve 7 and the tertiary gas inlet valve 8 can be opened, and after the material conveying is completed, the primary gas inlet valve 7 and the tertiary gas inlet valve 8 are closed.

[0078] The material conveying device further comprises a discharge valve 10 connected between the discharge port and the pressure transmitter 6, which is used to open the discharge port during discharging, or close the discharge port after the material conveying is completed.

[0079] The working process of the material conveying device of the present application is as follows:

[0080] In the feeding stage, the feeding valve 9 is opened, and when the material level meter 11 detects that the feeding amount reaches 80% of the volume of the bin pump 1, the feeding valve 9 is closed.

[0081] In the gas inlet stage, the primary gas inlet valve 7 and the tertiary gas inlet valve 8 are opened, and after a certain time delay, the discharge valve 10 is opened.

[0082] In the conveying stage, the pressure transmitter 6 detects the conveying pressure in real time during the conveying process, the primary gas flow meter 3 detects the primary gas flow in real time, and the tertiary gas flow meter 5 detects the tertiary gas flow in real time, when the conveying pressure is lower than the design requirement, the conveying is ended, the primary gas inlet valve 7 and the tertiary gas inlet valve 8 are closed, and after a certain time delay, the discharge valve 10 is closed, and the material conveying is completed.

[0083] The above is only a preferred embodiment of the present application, and it should be pointed out that, for ordinary skilled persons in the technical field, some improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A method of adjusting a material conveying air ratio, characterized by, The material conveying device comprises a primary gas regulating valve for regulating the primary gas flow and a tertiary gas regulating valve for regulating the tertiary gas flow, and after each conveying is completed, step A is performed, which comprises: Step S1: obtaining the average value of the lower limit of the gas flow during conveying, comparing the average value of the lower limit of the gas flow with the preset lower limit of the gas flow, if the deviation between the average value of the lower limit of the gas flow and the preset lower limit of the gas flow is less than the preset deviation range, then the opening of the primary gas regulating valve and the tertiary gas regulating valve is increased, if the deviation between the average value of the lower limit of the gas flow and the preset lower limit of the gas flow is greater than the preset deviation range, then the opening of the primary gas regulating valve and the tertiary gas regulating valve is decreased; The step A further comprises the following steps before the step S1: Step S01: obtaining the average value of the upper limit of the gas flow during conveying, comparing the average value of the upper limit of the gas flow with the preset upper limit of the gas flow, if the average value of the upper limit of the gas flow is greater than the preset upper limit of the gas flow, then the preset deviation range is -a%~b%; if the average value of the upper limit of the gas flow is less than the preset upper limit of the gas flow, then the preset deviation range is -c%~d%.

2. The method of material conveying air ratio adjustment according to claim 1, characterized by, The average value of the lower limit of the gas flow during conveying is obtained, specifically comprising the following steps: The conveying pressure curve and the gas flow curve during conveying are obtained, the pressure values between the preset upper limit of pressure and the preset lower limit of pressure in the conveying pressure curve are sorted in time sequence to form a pressure upper limit time column; The gas flow corresponding to each time point in the pressure upper limit time column is selected on the gas flow curve, and the gas flow is sorted in time sequence to form a gas flow lower limit time column; The average value of the lower limit of the gas flow is calculated according to each gas flow in the gas flow lower limit time column.

3. The method of claim 1, wherein, The average value of the upper limit of the gas flow during conveying is obtained, specifically comprising the following steps: The conveying pressure curve and the gas flow curve during conveying are obtained, the pressure values less than the preset lower limit of pressure in the conveying pressure curve are sorted in time sequence to form a pressure lower limit time column; The gas flow corresponding to each time point in the pressure lower limit time column is selected on the gas flow curve, and the gas flow is sorted in time sequence to form a gas flow upper limit time column; The average value of the upper limit of the gas flow is calculated according to each gas flow in the gas flow upper limit time column.

4. The method of claim 2, wherein, The gas flow curve is obtained, specifically comprising the following steps: The primary gas flow curve and the tertiary gas flow curve are obtained, and the primary gas flow curve and the tertiary gas flow curve are superimposed to form the gas flow curve.

5. The method of material conveying air ratio adjustment according to claim 4, wherein, The primary gas flow curve is obtained by real-time detection of the primary gas flow of the material conveying device during conveying through a primary gas flow meter; And / or, the tertiary gas flow curve is obtained by real-time detection of the tertiary gas flow of the material conveying device during conveying through a tertiary gas flow meter.

6. The method of claim 1-5, wherein, The regulating step of the primary gas regulating valve and the tertiary gas regulating valve is K, and the opening ratio of the primary gas regulating valve and the tertiary gas regulating valve is X, When the deviation between the average value of the lower limit of the gas flow and the preset lower limit of the gas flow is less than the preset deviation range, the opening of the third gas regulating valve is increased by K*X, and the opening of the first gas regulating valve is increased by K*(1-X); When the deviation between the average value of the lower limit of the gas flow and the preset lower limit of the gas flow is greater than the preset deviation range, the opening of the third gas regulating valve is decreased by K*X, and the opening of the first gas regulating valve is decreased by K*(1-X).

7. The method of material conveying air ratio adjustment according to claim 2 or 3, characterized by, The conveying pressure curve of the material conveying device during conveying is obtained by detecting the conveying pressure of the material conveying device in real time through a pressure transmitter.

8. A material conveying apparatus adapted to the material conveying air ratio adjustment method according to any one of claims 1 to 7, characterized by, It comprises: a bin pump (1) having a discharge port, a first gas inlet and a third gas inlet; a first gas regulating valve (2) and a first gas flow meter (3), the first gas regulating valve (2) being communicated with the first gas inlet, and the first gas flow meter (3) being communicated with the first gas regulating valve (2); a third gas regulating valve (4) and a third gas flow meter (5), the third gas regulating valve (4) being communicated with the third gas inlet, and the third gas flow meter (5) being communicated with the third gas regulating valve (4); a pressure transmitter (6) being communicated with the discharge port.

9. A material delivery apparatus according to claim 8, wherein, It also comprises a first gas inlet valve (7) and a third gas inlet valve (8), the first gas inlet valve (7) being connected between the first gas inlet and the first gas regulating valve (2), and the third gas inlet valve (8) being connected between the third gas inlet and the third gas regulating valve (4).

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