CN114701863B - Visual intelligent energy-saving method and device for pneumatic conveying system - Google Patents

Abstract

The invention provides a visual intelligent energy-saving method and a visual intelligent energy-saving device for a pneumatic transmission system, wherein the method comprises the following steps: collecting conveying pressure data of a material conveying pipeline in real time based on a pressure collecting component; acquiring conveying pressure data of a conveying pipeline in a first time period before the current moment; judging whether the collected pressure values in the first time period are larger than a pressure set value or not; under the condition that the pressure value is larger than the pressure set value, acquiring each time information corresponding to each pressure value larger than the pressure set value; calculating the duration of the pressure value greater than the pressure set value in the first time period based on the acquired time information corresponding to the pressure values greater than the pressure set value, and judging whether the duration is greater than the first time set value; and reducing the pneumatic transmission duration between the current moment and the starting time of the second time period under the condition that the duration is greater than the first time set value. The method improves the safety of the material conveying system and saves the gas consumption.

Description

Visual intelligent energy-saving method and device for pneumatic conveying system

Technical Field

The invention relates to the technical field of pneumatic conveying systems, in particular to a visual intelligent energy-saving method and device for a pneumatic conveying system.

Background

At present, pneumatic conveying systems of domestic large coal-fired thermal power plants and steel plants generally adopt a time control mode and a material level priority mode to finish a conveying process, namely, conveying time is set according to operation experience of operators at ordinary times, and a high-material-level alarming bin pump is set to carry out priority conveying. The mode selection and program control mode of the program control equipment in the method form a standardized and modular design.

Although the control process of the method is simple, the program control means is too single, and the setting of key parameters such as conveying cycle time, blanking time and the like completely depends on the experience and responsibility of operators. The method is practical for coal-fired thermal power plants with stable coal types and stable unit loads, but the safety of the operation process is difficult to ensure for the coal-fired thermal power plants burning complicated coal types and having large unit load change; in addition, parameters such as conveying cycle time, blanking time and the like in the pneumatic conveying process of the control method commonly used in the prior art are preset, so that if the material amount is increased or reduced in a certain period of time, the situation of gas waste caused by over-blowing or air-blowing exists. Therefore, how to improve the safety of the pneumatic conveying system and save the gas consumption is an urgent technical problem to be solved.

Disclosure of Invention

Accordingly, the present invention is directed to an energy saving method and apparatus for a pneumatic conveying system to solve one or more of the problems of the prior art.

According to one aspect of the invention, the invention discloses a pneumatic transmission system energy-saving method, which comprises the following steps:

collecting conveying pressure data of a conveying pipeline in the material conveying system in real time based on a pressure collecting component;

acquiring conveying pressure data of a conveying pipeline in a first time period before the current time, wherein the conveying pressure data comprises a plurality of pressure values and time information corresponding to each pressure value, and the first time period is the last loading continuous process of the material conveying system at the current time;

judging whether the collected pressure values in the first time period are larger than a pressure set value or not;

under the condition that the pressure value is larger than the pressure set value, acquiring each time information corresponding to each pressure value larger than the pressure set value;

calculating the duration time that the pressure value in the first time period is greater than the pressure set value based on the acquired time information corresponding to the pressure values that are greater than the pressure set value, and judging whether the duration time is greater than a first time set value;

and under the condition that the duration is greater than the first time set value, reducing the pneumatic transmission duration between the current time and the starting time of a second time period, wherein the second time period is the last charging duration of the current time of the material conveying system.

In some embodiments of the invention, the method further comprises:

and calculating whether the total duration of the first time period is greater than a second time set value, and reducing the pneumatic transmission duration between the current moment and the starting time of the second time period under the condition that the total duration of the first time period is greater than the second time set value.

In some embodiments of the invention, the method further comprises:

under the condition that the duration time is not greater than the first time set value, judging whether the pneumatic transmission duration time between the current time and the starting time of the second time period is greater than a third time set value or not;

and under the condition that the pneumatic transmission duration between the current time and the starting time of the second time period is not more than the third time set value, increasing the pneumatic transmission duration between the current time and the starting time of the second time period.

In some embodiments of the invention, the method further comprises:

and reducing the pneumatic transmission duration between the current time and the starting time of the second time period under the condition that the pneumatic transmission duration between the current time and the starting time of the second time period is greater than the third time set value.

In some embodiments of the invention, in the case where the duration is greater than the first time setting, reducing the duration of pneumatic transmission between the current time and the start time of the second time period comprises:

calculating a difference between the duration and the first time setting value if the duration is greater than the first time setting value;

and determining the operating parameters of the gas generating device in the material conveying system based on the difference value.

In some embodiments of the present invention, the number of the pressure collecting parts is plural, and the plural pressure collecting parts are respectively disposed behind plural material conveying pumps of the material conveying system.

In some embodiments of the invention, the pressure acquisition component is a pressure sensor.

According to another aspect of the invention, a pneumatic energy saving system for a material conveying system is also disclosed, the system comprising:

the pressure acquisition component is used for acquiring the conveying pressure data of a conveying pipeline in the material conveying system in real time;

the PLC is used for obtaining conveying pressure data of a conveying pipeline in a first time period before the current time, wherein the conveying pressure data comprises a plurality of pressure values and time information corresponding to the pressure values, the first time period is a last charging continuous process of the current time of the conveying material conveying system, whether the collected pressure values in the first time period are larger than a pressure set value or not is judged, under the condition that the pressure values are larger than the pressure set value, time information corresponding to the pressure values larger than the pressure set value is obtained, the duration time that the pressure values in the first time period are larger than the pressure set value is calculated based on the obtained time information corresponding to the pressure values larger than the pressure set value, whether the duration time is larger than the first time set value is judged, under the condition that the duration time is larger than the first time set value, pneumatic conveying duration time between the current time and the starting time of a second time period is reduced, and the second time period is a last charging continuous process of the current time of the conveying material conveying system.

In some embodiments of the present invention, the system further comprises a concentrated phase boosting device, wherein the concentrated phase boosting device comprises a gas generation device, a gas delivery main pipe and at least one set of boosting components; the boosting assembly comprises:

the head end of the gas conveying branch pipe is communicated with the gas conveying main pipe, and the tail end of the gas conveying branch pipe is blocked;

the control valve is positioned on the gas conveying branch pipe;

the concentrated phase boosting component is arranged at the rear end of the control valve and communicated with the gas conveying branch pipe, the concentrated phase boosting component comprises a flow controller and a concentrated phase booster, and the output end of the concentrated phase booster is communicated with a material conveying pipe of the material conveying system.

In some embodiments of the invention, the flow controller is a column-tube flow controller, the column-tube flow controller is located between the concentrated phase booster and the gas delivery branched tube, and the aperture of the output end of the column-tube flow controller is smaller than that of the input end; or the like, or, alternatively,

the flow controller is a flat plate type flow controller, the flat plate type flow controller is positioned between the concentrated phase booster and the conveying pipe, and an adjusting air hole is formed in the position, corresponding to the air outlet of the concentrated phase booster, of the flat plate type flow controller.

The energy-saving method and the energy-saving device for the pneumatic conveying system are used for acquiring the conveying pressure data of a conveying pipeline in the material conveying system in real time, and adjusting the blanking duration time based on the conveying pressure corresponding to the previous material loading process at the current moment, so that the cycle period of the material conveying process is adjusted. And when the material amount in a certain time interval is increased or reduced in the material conveying process, the method or the system can adjust the material conveying frequency in real time, so that the gas consumption is saved.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

It will be appreciated by those skilled in the art that the objects and advantages that can be achieved with the present invention are not limited to the specific details set forth above, and that these and other objects that can be achieved with the present invention will be more clearly understood from the detailed description that follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention. For purposes of illustrating and describing some portions of the present invention, corresponding parts of the drawings may be exaggerated, i.e., may be larger, relative to other components in an exemplary apparatus actually manufactured according to the present invention. In the drawings:

fig. 1 is a schematic flow chart of an energy saving method for a pneumatic conveying system according to an embodiment of the present invention.

Fig. 2 is a schematic flow chart of an energy saving method for a pneumatic conveying system according to another embodiment of the present invention.

Fig. 3 is a conveying curve diagram of a material conveying system when the pneumatic energy-saving method is not adopted.

Fig. 4 is a conveying curve diagram of a material conveying system after the pneumatic energy-saving method is adopted.

Fig. 5 is a comparative diagram of the conveying curves before and after the pneumatic energy-saving method is adopted in the material conveying system according to the embodiment of the invention.

Fig. 6 is a diagram of a first visualization interface of the material handling system according to an embodiment of the invention.

Fig. 7 is a second visual interface display of the material handling system in accordance with an embodiment of the present invention.

Fig. 8 is a pressure curve diagram after the pneumatic energy-saving method of the invention is adopted.

Fig. 9 is a first program control diagram of a pneumatic energy saving method according to an embodiment of the present invention.

Fig. 10 is a second program control diagram of the pneumatic energy saving method according to an embodiment of the present invention.

Fig. 11 is a third program control diagram of the pneumatic energy saving method according to an embodiment of the invention.

Fig. 12 is a schematic structural diagram of a concentrated phase boosting device according to an embodiment of the present invention.

Fig. 13 is a schematic structural diagram of a concentrated phase boosting component according to an embodiment of the invention.

Fig. 14 is a schematic structural diagram of a flow controller according to an embodiment of the present invention.

FIG. 15 is a top view of a flat plate flow controller according to one embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.

It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the scheme according to the present invention are shown in the drawings, and other details not closely related to the present invention are omitted.

It should be emphasized that the term "comprises/comprising/comprises/having" when used herein, is taken to specify the presence of stated features, elements, steps or components, but does not preclude the presence or addition of one or more other features, elements, steps or components.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals denote the same or similar parts, or the same or similar steps. In addition, the following material conveying system can be specifically an ash conveying system, and the conveying pipe is correspondingly an ash conveying pipe at the moment; the conveying pipe can also convey other materials except ash.

Fig. 1 is a schematic flow chart of an energy saving method for a pneumatic conveying system according to an embodiment of the present invention, and as shown in fig. 1, the method at least includes steps S10 to S60.

Step S10: and acquiring the conveying pressure data of a conveying pipeline in the material conveying system in real time based on a pressure acquisition component.

In this step, the pressure acquisition component may specifically be a pressure sensor, that is, the pressure sensor acquires the conveying pressure data of the conveying pipeline in the material conveying system in real time. In the material conveying system, the number of the pressure acquisition parts can be multiple, namely a plurality of pressure sensors can be arranged on the conveying pipeline at intervals; for example, when the material conveying system comprises a plurality of material conveying pumps, each pressure sensor can be respectively arranged behind each material conveying pump. It is easy to understand that in order to accurately master the conveying pressure at each position in the pneumatic conveying system, necessary pressure measuring points can be arranged at corresponding positions of the conveying pipeline according to actual needs.

Step S20: the method comprises the steps of obtaining conveying pressure data of a conveying pipeline in a first time period before the current moment, wherein the conveying pressure data comprise a plurality of pressure values and time information corresponding to each pressure value, and the first time period is the last loading continuous process of the material conveying system at the current moment.

In this step, the total duration of the first time period is the total duration of the last charging duration at the current time, and in this time period, each time point corresponds to one pressure value, so that the number of the pressure values in the first time period collected by the pressure collecting means is plural.

Step S30: and judging whether the collected pressure values in the first time period are larger than a pressure set value or not.

The pressure set value can be a preset value used for judging whether the material quantity in the material conveying system is too large, such as 0.12MPa. In this step, the pressure values corresponding to the first time period are further compared with the preset 0.12MPa in sequence. It should be understood that the specific values of the pressure set points may vary from material delivery system to material delivery system, and are specifically set according to actual needs.

Step S40: and under the condition that the pressure value is greater than the pressure set value, acquiring each time information corresponding to each pressure value greater than the pressure set value.

In this step, all pressure values greater than the pressure set value in the first time period are obtained, and time information corresponding to the pressure values greater than the pressure set value is obtained. The time information of the pressure value is obtained in order to further determine the time during which the delivery pressure during the previous charging at the current moment was greater than the pressure set value.

Step S50: and calculating the duration of the pressure value greater than the pressure set value in the first time period based on the acquired time information corresponding to the pressure values greater than the pressure set value, and judging whether the duration is greater than the first time set value.

In this step, the time during which the delivery pressure exceeds the pressure set value in the first period is calculated based on the time information corresponding to the delivery pressure that is greater than the pressure set value acquired in step S40. And further comparing the time for which the pressure exceeds the pressure set value with a preset first time set value, wherein the first time set value is exemplarily 150 seconds, 140 seconds and the like.

Step S60: and under the condition that the duration is greater than the first time set value, reducing the pneumatic transmission duration between the current time and the starting time of a second time period, wherein the second time period is the last charging duration of the current time of the material conveying system.

In the process, if the duration that the conveying pressure in the first time period is greater than the pressure set value is judged to be greater than the first time set value, the material quantity of the material conveying system in the first time period is larger, the stable operation of the system is ensured by correcting the material conveying period, namely, the blanking time between two times of loading before and after the current moment is shortened, namely, the duration of pneumatic conveying between the current moment and the starting time of the second time period is reduced; if one charging process and one discharging process are regarded as one cycle, the cycle time is correspondingly shortened.

In another embodiment, the method further comprises: and calculating whether the total duration of the first time period is greater than a second time set value, and reducing the pneumatic transmission duration between the current moment and the starting time of the second time period under the condition that the total duration of the first time period is greater than the second time set value.

In the embodiment, whether the charging time of the current cycle exceeds a second time set value is judged; under the condition that the second time set value is not exceeded, a result that the material conveying system is not charged at the moment is obtained; and if the result exceeds the second time set value, the result that the material conveying system is large in charging amount at the moment is obtained. In order to ensure the stable operation of the system, the material conveying period is also corrected, and the blanking time of the current cycle period is correspondingly reduced, so that the material conveying frequency is increased. The second time setting value is similar to the first time setting value and is preset according to the actual requirement of the material conveying process.

Referring to fig. 2, if it is determined that all the collected pressure values in the first time period are smaller than the pressure set value, a result that the material output is not large may also be directly obtained at this time. At this time, it can be further determined whether the current cycle period is less than or equal to a fourth time setting value, where the fourth time setting value is also preset, and the current cycle period can be regarded as the sum of the previous charging duration and the next blanking duration of the current time. Further, when the current cycle period is less than or equal to the fourth time set value, the cycle period is further increased, for example, the charging duration is increased; in addition, whether the blanking time of the current cycle period is less than or equal to a third time set value can be further judged, and when the blanking time of the current cycle period is less than or equal to the third time set value, the blanking time can be increased. In another embodiment of the present invention, the method further comprises: under the condition that the duration time is not greater than the first time set value, judging whether the pneumatic transmission duration time between the current time and the starting time of the second time period is greater than a third time set value or not; and under the condition that the pneumatic transmission duration between the current moment and the starting time of the second time period is not greater than the third time set value, increasing the pneumatic transmission duration between the current moment and the starting time of the second time period.

In this embodiment, it is determined in advance that the pressure value greater than the pressure setting value exists in the first time period, and then it is further determined that the duration of the conveying pressure greater than the pressure setting value is less than the first time setting value, and then a result that the conveying capacity of the material conveying system is not large can be obtained, and then it can be further determined whether the blanking time of the current cycle is greater than a preset third time setting value, and when the blanking time is less than or equal to the preset third time setting value, the blanking duration is further increased. The blanking duration here refers to the duration of the next blanking after the current time, that is, the duration of pneumatic transmission between the current time and the starting time of the second time period.

In addition, in the above embodiment, in addition to determining whether the blanking time of the current cycle is greater than the preset third time setting value, it may also be determined whether the current cycle is greater than the preset fourth time setting value, and when the blanking time of the current cycle is less than or equal to the preset fourth time setting value, the cycle may be increased accordingly.

In another embodiment of the present invention, the method further comprises: and under the condition that the pneumatic transmission duration between the current moment and the starting time of the second time period is greater than the third time set value, reducing the pneumatic transmission duration between the current moment and the starting time of the second time period.

In this embodiment, if it is determined that the blanking time of the current cycle is greater than the third time setting value, the blanking duration is further shortened.

Through the embodiment, the blanking time and the cycle period are adjusted in real time in the material conveying process, so that the safety of the system is improved, and the gas consumption is saved.

Further, when the duration is greater than the first time setting value, decreasing the duration of pneumatic transmission between the current time and the start time of the second time period includes: calculating a difference between the duration and the first time setting value if the duration is greater than the first time setting value; determining an operating parameter of a gas generating device in the material conveying system based on the difference. The steps can be realized through a PLC controller, and the PLC controller is also connected with the pressure acquisition component at the moment so that the PLC controller can acquire the conveying pressure in the material conveying system acquired by the pressure acquisition component in real time. Illustratively, the PLC controller may be an industrial personal computer.

Correspondingly, the invention also discloses a pneumatic energy-saving system for the material conveying system, which comprises:

the pressure acquisition component is used for acquiring the conveying pressure data of a 001 pipeline of a conveying pipeline in the material conveying system in real time; and

the PLC is used for obtaining conveying pressure data of a conveying pipeline 001 in a first time period before the current time, wherein the conveying pressure data comprise a plurality of pressure values and time information corresponding to the pressure values, the first time period is a last charging continuous process of the current time of the material conveying system, whether the collected pressure values in the first time period are larger than a pressure set value or not is judged, under the condition that the pressure values are larger than the pressure set value, time information corresponding to the pressure values larger than the pressure set value is obtained, the duration time of the pressure values larger than the pressure set value in the first time period is calculated based on the obtained time information corresponding to the pressure values larger than the pressure set value, whether the duration time is larger than the first time set value is judged, under the condition that the duration time is larger than the first time set value, pneumatic conveying duration time between the current time and the starting time of a second time period is reduced, and the second time period is a last charging continuous process of the current time of the material conveying system.

Further, the pneumatic energy-saving system further comprises a concentrated phase boosting device, as shown in fig. 12, the pressure collecting component 200 is disposed on the material conveying pipe 001, and the concentrated phase boosting device comprises a gas generating device, a gas conveying main pipe 100 and at least one set of boosting components.

Referring to fig. 13, the boosting assembly includes a gas delivery manifold 310, a control valve 320, and at least one set of concentrated phase boosting components. The head end of the gas conveying branch pipe 310 is communicated with the gas conveying main pipe 100, and the tail end of the gas conveying branch pipe 310 is blocked; a control valve 320 is positioned on the gas delivery manifold 310; the control valve 320 can be connected with a PLC controller to control the on-off of the gas conveying branch pipe 310 based on a control signal sent by the PLC controller; concentrated phase boosting components are arranged at the rear end of the control valve 320 and communicated with the gas conveying branch pipe 310, each concentrated phase boosting component comprises a flow controller 331 and a concentrated phase booster 332, and the output end of each concentrated phase booster 332 is communicated with a conveying pipe 001 of the material conveying system. Flow controller 331 is specifically provided at the input end of dense phase booster 332, and may also be provided at the output end of dense phase booster 332, mainly for increasing the gas flow rate at the output end of the dense phase boosting component. Wherein, air generator specifically can be the air compressor machine, and the air compressor machine further can be connected with the PLC controller to make the operation of PLC controller control air compressor machine.

When the flow controller 331 is located at the input end of the dense phase booster 332, the flow controller 331 is specifically located between the dense phase booster 332 and the gas conveying branch pipe 310, at this time, the flow controller 331 may be a flow controller 331 with a column pipe type structure, and the aperture of the output end of the column pipe type flow controller 331 is smaller than that of the input end; the input end of the column tube type flow controller 331 is connected with the gas conveying branch tube 310, the output end of the column tube type flow controller 331 is connected with the input end of the concentrated phase booster 332, and the output end of the concentrated phase booster 332 is connected with the material conveying pipe 001; in addition, in order to ensure that a certain included angle is maintained between the axis of the concentrated phase booster 332 and the axis of the material conveying pipe 001, a right-angle pipe joint 334 can be further arranged on a branch of the concentrated phase boosting assembly, and the included angle between the central axis of the concentrated phase booster 332 or the column pipe type flow controller 331 and the central axis of the gas conveying branch pipe 310 can be 30-90 degrees. Referring to fig. 12, one end of the right-angle pipe joint 334 is connected to the gas conveying branch pipe 310 through a bent pipeline, and the other end of the right-angle pipe joint is connected to an input end of a column pipe type flow controller 331, so that an included angle of 45-90 degrees is formed between an axis of the concentrated phase booster 332 and an axis of the conveying pipe 001, and the boosting gas output by the concentrated phase booster 332 is obliquely conveyed into the conveying pipe 001 through the structure, so that the boosting effect of the material in the conveying pipe 001 is further improved.

When the flow controller 331 is located at the output end of the dense phase booster 332, the flow controller 331 is specifically located between the dense phase booster 332 and the material conveying pipe 001, and the flow controller 331 is a flat plate type flow controller 331 (refer to fig. 15); for example, in order to adjust the flow rate of the boosting gas, the flat plate type flow controller 331 has an adjusting gas hole at a position corresponding to the gas outlet of the concentrated phase booster 332; wherein, the quantity of adjusting the gas pocket can be a plurality ofly, and sets up at the interval between two arbitrary adjusting the gas pocket, and a plurality of adjusting the gas pocket can be the circumference array and arrange. Illustratively, as shown in fig. 14, flat plate flow controller 331 may be connected to concentration booster 332 via flanges, specifically, two flanges (one flange is shown) may be disposed opposite to each other, and flat plate flow controller 331 is located between two flanges 3311, wherein one end of the first flange is connected to the output end of concentration booster 332, so that the gas from concentration booster 332 is delivered between the two flanges through the gas holes on the first flange, and further delivered backward through gas throttling holes 3310 on flat plate flow controller 331 and the gas holes on the second flange, and the end of the second flange is further communicated with the flow delivery pipe, so that the gas flowing through the second flange is further delivered into the flow delivery pipe.

In an embodiment of the present invention, the boosting assembly further includes a filter member 340, the filter member 340 is disposed on the gas delivery branched pipe 310, and the filter member 340 is located at a front end of the control valve 320. The filtering part 340 is used to filter impurities in the boost gas, so as to prevent the control valve 320 or the flow controller 331 in the dense phase boost part from being blocked, and to ensure the purity of the gas delivered into the delivery pipe 001. In order to achieve the secondary filtration of the boost gas, the concentrated phase boost component may further include a secondary filtration device disposed at the front end of the concentrated phase booster 332, preferably at the front end of the branch of the concentrated phase boost component, so that the gas in the gas delivery branch 310 is first filtered by the secondary filtration device, and the secondarily filtered gas is further delivered into the delivery pipe 001 through the flow controller 331 and the concentrated phase booster 332. It should be understood that the specific parameters of the filtering device are not particularly limited and may be set according to the actual application environment.

Further, the dense phase boosting device further includes a first manual cut-off valve 350, the first manual cut-off valve 350 is disposed on the gas delivery branch pipe 310, and the first manual cut-off valve 350 is located at the front end of the filter part 340. A first manual stop valve 350 is arranged on the gas transmission branch pipe 310, so that the maintenance of each part on the gas transmission branch pipe 310 is facilitated; thus, when the whole material conveying system is provided with a plurality of groups of boosting assemblies, the gas circuit of the group of boosting assemblies can be cut off by manually closing the first manual stop valve 350 on the boosting assembly with a fault, and then the fault component is maintained or repaired. For example, the number of the concentrated phase boosting components on each group of boosting components may be five, and five groups of concentrated phase boosting components are arranged at intervals, referring to fig. 12, five groups of concentrated phase boosting components are five parallel branches branched off based on the gas conveying branch pipe 310, the distance between any two groups of concentrated phase boosting components may be 4 meters, and the tail end of the gas conveying branch pipe 310 may be plugged by an end cover, so that the gas at the branched part of the ground body conveying branch pipe from the gas conveying main pipe 100 is all branched into the gas conveying pipe 001 through the five groups of concentrated phase boosting components. It should be understood that the concentrated phase boost assemblies in this embodiment may be provided in more groups, and the spacing between two adjacent groups of concentrated phase boost assemblies may be varied according to the actual amount of boost gas required.

Fig. 3 is a material conveying curve diagram of a material conveying system without using the pneumatic energy saving method of the present invention, fig. 4 is a material conveying curve diagram of the material conveying system using the pneumatic energy saving method of the present invention, fig. 5 is a comparison diagram of material conveying curves before and after the material conveying system using the pneumatic energy saving method of the present invention, the abscissa of fig. 3, fig. 4 and fig. 5 represents time, and the ordinate represents pressure, and it can be seen from fig. 3, fig. 4 and fig. 5 that the amount of material conveyed per cycle period is small, the average pressure is low, and the conveying frequency is high before the material conveying system uses the pneumatic energy saving method of the present invention; when the pneumatic energy-saving method is used for a material conveying system, the average conveying pressure is increased, and the conveying frequency is obviously reduced. For the pneumatic energy-saving method or system, when the material quantity is increased, the material conveying system can automatically shorten the cycle period to increase the material conveying quantity; the smooth operation of the material conveying period guaranteeing system can be automatically corrected according to the current material quantity, the waste of compressed air is reduced due to air blowing when the material quantity is less, and meanwhile, the material conveying frequency is reduced, which means that the abrasion of a pipeline and the switching times of valves of various devices are reduced. When the load of the unit is reduced and the material quantity is reduced every day, the conveying period is gradually lengthened, the conveying times are correspondingly reduced, the average conveying pressure is improved, when the material quantity is large, the material conveying system can automatically shorten the cycle period, the purpose of automatically adjusting according to the material quantity is achieved, and the pressure difference between the air source pressure and the material conveying pipeline is reduced; the air flow passing through the orifice plate is reduced, so that the air consumption in unit time is reduced, and the consumption of conveying compressed air is saved.

Besides, the adjustment of the cycle offset time of the material conveying system is added, so that the peak air consumption is reduced, the operation of the air compressor of the whole material conveying system is further optimized, and the stable operation of the pressure of the compressed air main pipe is maintained.

Fig. 9, fig. 10 and fig. 11 are program control diagrams of the pneumatic energy saving method of the present invention. As can be seen from FIG. 9, when the feeding pressure in one region of an electric field is greater than or equal to 0.12MPa and the time is greater than 150 seconds, the system outputs a large signal of the feeding amount; or outputting a large material quantity signal when the material conveying time exceeds 420 seconds. As can be seen from fig. 10, when the large material quantity signal is sent out, the previous cycle period in the next electric field region is greater than or equal to 400 seconds, the next cycle period is reduced by 150 seconds, and the blanking time is reduced by 5 seconds. As can be seen from fig. 11, when the small material amount signal is sent, the previous cycle period in the next electric field area is less than or equal to 1100 seconds, the next cycle period is increased by 150 seconds, and the blanking time is increased by 5 seconds.

In order that those skilled in the art may better understand the present invention, the following description will illustrate the embodiments and functions of the present invention with a specific example.

For example, for a material handling system, the load during the day is around 660MW, the coal type is the best mix, and the coal feed is around 250 tons. The material conveying system is used for conveying materials in four electric fields, wherein most of the materials are in one electric field (more than 80%), the material in the second electric field is about 8%, and the material amount of the third electric field and the material amount of the fourth electric field account for less than 10% of the total material amount. 3. If a small amount of materials in the four electric fields are stored in the hopper for too long time, the temperature of the materials can be reduced and the fluidity of the materials is deteriorated, so that the three and four electric fields adopt a regular conveying mode (the cycle period is 1800 seconds for the three electric fields and 2000 seconds for the four electric fields); in the case of large material quantity of an electric field, considering that the material quantity is changed greatly under the conditions of load, coal quality fluctuation, material blowing and the like, the electric field adopts a variable-period conveying mode (namely, the cycle period is automatically adjusted); the two electric fields are standby electric fields of one electric field, and the two electric fields also adopt a variable-period conveying mode (namely, automatic adjustment of cycle period) in consideration of the fact that the blanking quantity is greatly changed when the one electric field is withdrawn and under the conditions of load, fluctuation of coal quality, blowing and the like.

When the system is in specific operation, the material level of the conveying pump and the blanking condition of the hopper are checked in detail when the pump is full and the conveying condition is not full. 14, starting an electric field material conveying branch line of the electric precipitation unit and stopping running for 1 hour in a first area, and waiting for the accumulated materials of the hopper to fully fill the whole cabin pump; 15, putting the first material conveying branch line zone into operation; 4 bin pumps can be fully filled in the charging process; the level meter can alarm correctly to prove that the bin pump works normally; in the next day 14; 15, putting the second material conveying branch area into operation; 4 bin pumps can be fully filled in the charging process; the level meter can alarm correctly to prove that the bin pump works normally; the exhaust pipe condition is checked, the exhaust pipe blockage is found to be serious, and the blockage of the exhaust pipe can be smooth after treatment (the blockage of the exhaust pipe can cause unsmooth blanking, and the hopper is easy to collect materials).

Specifically, the automatic cycle period is adjusted so that the next cycle period is determined based on the shape of the conveyance curve (conveyance pressure and conveyance time) in the previous cycle period. According to analysis and statistics of a transmission curve during data acquisition in several days before debugging under different time periods and different load conditions, the following parameters are determined:

an electric field:

the cycle period increase and decrease conditions are as follows: the delivery pressure is above 120KPa and is more than 150 seconds or the delivery time is more than 420 seconds

Increase and decrease of step pitch in cycle period: 150 seconds

Upper limit of cycle period: 1200 seconds

Lower limit of cycle period: 300 seconds

The blanking time increases and decreases the step distance: 5 seconds

The upper limit of blanking time: 150 seconds

The lower limit of blanking time: 100 seconds

Two electric fields:

circulation period increase and decrease conditions: the delivery pressure is above 120KPa and is more than 150 seconds or the delivery time is more than 420 seconds

Increase and decrease of step pitch in cycle period: 150 seconds

Upper limit of cycle period: 3600 seconds

Lower limit of cycle period: 520 seconds

The blanking time increases and decreases the step distance: 5 seconds

The upper limit of blanking time: 150 seconds

The lower limit of blanking time: 100 seconds

The following data are obtained by statistical comparison of the running conditions of the electric dust removal-electric field-area material conveying system before debugging (without adopting the pneumatic energy-saving method) and after debugging (adopting the pneumatic energy-saving method of the invention):

the statistical conditions of the material conveying operation conditions of the first electric field and the second electric field of the electric precipitation of the unit in the same time period are as follows:

before debugging, the air compressor is continuously loaded with almost no unloading time, after debugging, the unloading time of the air compressor is prolonged, and the consumption ratio of the compressed air before debugging to the compressed air after debugging is 1:0.72, the power of the motor of the material conveying air compressor is 220-250KW, and the power consumption of the pneumatic material removing system is saved by 28 percent.

Specifically, in the above embodiment, when the amount of the material in the pump is large, the conveying time is increased and the conveying pressure is increased, according to the conveying characteristic, the on-site conveying condition is subjected to model learning in combination with theoretical calculation to gradually determine the parameters of automatic operation, the operation parameters are preliminarily determined and then put into automatic operation, and the conveying parameters are finely adjusted according to the actual conveying condition to finally determine the parameters.

Fig. 6, fig. 7 and fig. 8 are interface display diagrams of the material conveying system according to an embodiment of the present invention, and it is apparent from fig. 6 that the material conveying frequency of the system after the pneumatic conveying energy saving method of the present invention is applied is significantly reduced, and the single material conveying amount is increased. As is apparent from fig. 7, the conveying pressure in the conveying pipeline in the material conveying system can be visually displayed through the display interface of the system; and the delivery pressure at each point in the delivery conduit can be further displayed on a system display interface through a curve diagram shown in fig. 8, wherein fig. 8 corresponds to the pressure data of two monitoring points in the delivery conduit shown in fig. 7. In summary, as can be seen from fig. 6 to 8, the energy saving method and the corresponding system or apparatus adopted in the embodiment of the present invention can conveniently realize visualization.

The energy-saving method and the device for the pneumatic conveying system reduce the labor intensity of operators, and do not need to respectively modify the period parameters according to the conveying condition of materials; the safety of system operation is improved, and improper operation is reduced due to automatic adjustment of the system; meanwhile, the system can be additionally provided with an automatic and manual switching button, the original program control mode is still kept, and the reliability is further improved; spare parts and maintenance cost are greatly reduced. The operation times of about 40 main material removing valves of each unit are halved according to the verification, the pipeline abrasion is greatly slowed down, and the cost is saved considerably.

It should also be noted that the exemplary embodiments mentioned in this patent describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above-described steps, that is, the steps may be performed in the order mentioned in the embodiments, may be performed in an order different from the order in the embodiments, or may be performed simultaneously.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments and/or in combination with or instead of the features of the other embodiments in the present invention.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the embodiment of the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. An energy-saving method for a pneumatic conveying system is characterized by comprising the following steps:

the method comprises the steps that conveying pressure data of a conveying pipeline in a material conveying system are collected in real time based on a pressure collecting component;

acquiring conveying pressure data of a conveying pipeline in a first time period before the current time, wherein the conveying pressure data comprises a plurality of pressure values and time information corresponding to each pressure value, and the first time period is the last loading continuous process of the material conveying system at the current time;

judging whether the collected pressure values in the first time period are larger than a pressure set value or not;

under the condition that the pressure value is larger than the pressure set value, acquiring each time information corresponding to each pressure value larger than the pressure set value;

calculating the duration time that the pressure value in the first time period is greater than the pressure set value based on the acquired time information corresponding to the pressure values that are greater than the pressure set value, and judging whether the duration time is greater than a first time set value;

when the duration is longer than the first time set value, reducing the pneumatic transmission duration between the current time and the starting time of a second time period, wherein the second time period is the last charging duration of the current time of the material conveying system; wherein the pneumatic transmission duration refers to the blanking time between two times of loading before and after the current moment;

calculating whether the total duration of the first time period is greater than a second time set value or not, and reducing the pneumatic transmission duration between the current moment and the starting time of the second time period to reduce the blanking time of the current cycle under the condition that the total duration of the first time period is greater than the second time set value; when the total duration of the first time period is longer than the second time set value, the fact that the material conveying system is large in charge is obtained;

under the condition that the duration time is not greater than the first time set value, judging whether the pneumatic transmission duration time between the current moment and the starting time of the second time period is greater than a third time set value or not;

increasing the pneumatic transmission duration between the current time and the starting time of the second time period under the condition that the pneumatic transmission duration between the current time and the starting time of the second time period is not greater than a third time set value;

and judging whether the current cycle period is greater than a preset fourth time set value or not, and increasing the cycle period when the current cycle period is less than or equal to the preset fourth time set value.

2. The energy saving method for pneumatic conveying system according to claim 1, characterized in that the method further comprises:

and reducing the pneumatic transmission duration between the current time and the starting time of the second time period under the condition that the pneumatic transmission duration between the current time and the starting time of the second time period is greater than the third time set value.

3. The energy-saving method for pneumatic conveying system according to claim 1, wherein in case that the duration is greater than the first time setting value, reducing the duration of pneumatic conveying between the current time and the starting time of the second time period comprises:

calculating a difference between the duration and the first time setting value if the duration is greater than the first time setting value;

determining an operating parameter of a gas generating device in the material conveying system based on the difference.

4. The energy saving method for pneumatic conveying system according to claim 1, wherein the number of the pressure collecting units is plural, and the plural pressure collecting units are respectively disposed behind the plural material conveying pumps of the material conveying system.

5. The energy saving method for pneumatic conveying system according to claim 1, wherein the pressure collecting component is a pressure sensor.

6. An energy saving device for a pneumatic conveying system, which is characterized by comprising:

the pressure acquisition component is used for acquiring the conveying pressure data of a conveying pipeline in the material conveying system in real time;

the PLC is used for acquiring conveying pressure data of a conveying pipeline in a first time period before the current time, wherein the conveying pressure data comprises a plurality of pressure values and time information corresponding to the pressure values, the first time period is a last charging continuous process of the current time of the material conveying system, whether the acquired pressure values in the first time period are larger than a pressure set value or not is judged, under the condition that the pressure values are larger than the pressure set value, time information corresponding to the pressure values larger than the pressure set value is acquired, the duration time of the pressure values larger than the pressure set value in the first time period is calculated based on the acquired time information corresponding to the pressure values larger than the pressure set value, whether the duration time is larger than the first time set value is judged, under the condition that the duration time is larger than the first time set value, pneumatic conveying duration time between the current time and the starting time of a second time period is reduced, and the second time period is a last charging continuous process of the current time of the material conveying system; wherein the pneumatic transmission duration refers to the blanking time between two times of loading before and after the current moment;

calculating whether the total duration of the first time period is greater than a second time set value or not, and reducing the pneumatic transmission duration between the current moment and the starting time of the second time period to reduce the blanking time of the current cycle under the condition that the total duration of the first time period is greater than the second time set value; when the total duration of the first time period is longer than the second time set value, the fact that the material conveying system is large in charge is obtained; under the condition that the duration time is not greater than the first time set value, judging whether the pneumatic transmission duration time between the current time and the starting time of the second time period is greater than a third time set value or not; increasing the pneumatic transmission duration between the current time and the starting time of the second time period under the condition that the pneumatic transmission duration between the current time and the starting time of the second time period is not greater than a third time set value; and judging whether the current cycle period is greater than a preset fourth time set value or not, and increasing the cycle period when the current cycle period is less than or equal to the preset fourth time set value.

7. The energy-saving device of pneumatic conveying system according to claim 6, wherein the system further comprises a concentrated phase boosting device, the concentrated phase boosting device comprises a gas generating device, a gas conveying main pipe and at least one group of boosting components; the boosting assembly comprises:

the head end of the gas conveying branch pipe is communicated with the gas conveying main pipe, and the tail end of the gas conveying branch pipe is blocked;

the control valve is positioned on the gas conveying branch pipe;

the concentrated phase boosting component is arranged at the rear end of the control valve and communicated with the gas conveying branch pipe, the concentrated phase boosting component comprises a flow controller and a concentrated phase booster, and the output end of the concentrated phase booster is communicated with a material conveying pipe of the material conveying system.

8. The energy-saving device of a pneumatic conveying system according to claim 7, wherein the flow controller is a cylindrical flow controller, the cylindrical flow controller is positioned between the dense phase booster and the gas conveying branch pipe, and the aperture of the output end of the cylindrical flow controller is smaller than that of the input end; or the like, or, alternatively,

the flow controller is a flat plate type flow controller, the flat plate type flow controller is positioned between the concentrated phase booster and the conveying pipe, and an adjusting air hole is formed in the position, corresponding to the air outlet of the concentrated phase booster, of the flat plate type flow controller.

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