System and device for monitoring coal level of raw coal hopper and coaling method of system and device

Abstract

The invention discloses a system and device for monitoring the coal level of a raw coal hopper and a coal feeding method thereof.The system comprises a monitoring unit which comprises at least three distance sensors distributed right above the coal hopper in a plane mode and used for monitoring the coal level, a control unit which obtains data of the distance sensors and calculates the real-time coal level, and when the real-time coal level is lower than a preset coal level, the control unit sends the real-time coal level to the coal hopper; the control unit sends out a first signal to store a coal hopper, a driving unit is arranged in the center of the bottom of the coal hopper sealing cover, the driving unit is connected with a mounting bracket through a connecting turntable, the mounting bracket is a closed pattern with a fixed geometric center, and the vertex or boundary point of the mounting bracket meets equidistant symmetry; the internal coal level is collected through the multiple collection units, the coal level of the raw coal hopper is accurately mastered, the actual coal level in the coal hopper is measured, coal feeding operation is carried out in cooperation with the coal feeding devices which are interlocked, automatic coal feeding control is achieved, and the working intensity of workers is reduced while unattended coal feeding work is achieved.

Description

Technical Field

[0001] The present invention relates to the field of coal loading in thermal power plants, and in particular to a system and device for monitoring the coal level in a raw coal hopper and a coal loading method thereof. Background Art

[0002] Thermal power plants generally control the coal feeding of boiler combustion by loading coal into the raw coal hopper. Generally, coal is loaded into the raw coal hopper in advance, and then distributed through the raw coal hopper. In winter and rainy seasons, long-term operation of the raw coal hopper will cause the coal hopper to hang on the wall, thereby generating a false coal position, which has a great impact on the fuel loading work and poses certain safety hazards. In order to prevent mistakes in loading coal into the raw coal hopper and prevent problems such as coal leakage, manual supervision of the coal loading in the raw coal hopper is required, which not only increases the labor intensity of employees, but also causes a harsh working environment and great harm to the human body. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is that long-term operation of the raw coal hopper in winter and rainy season will cause the coal hopper to hang on the wall, thereby generating a false coal position, which has a great impact on the fuel coal loading work.

[0004] The above technical problem is solved by the following technical solution: The present invention proposes a system for monitoring the coal level in a raw coal hopper, which includes a monitoring unit, including at least three distance sensors, which are distributed in a surface above the coal hopper for monitoring the coal level;

[0005] a control unit, which obtains the distance sensor data and calculates the real-time coal position;

[0006] When the real-time coal level is lower than the preset coal level, the control unit sends a first signal.

[0007] In a preferred embodiment of the system for monitoring the coal level in the raw coal hopper of the present invention: the first signal is calculated by a three-choice-two algorithm, and the algorithm is: the coal level in the coal hopper is collected by three groups of distance sensors to obtain three groups of coal level data. After randomly removing one group of data, the coal level values ​​in the two retained groups of data are compared separately. If more than one-third of the coal level values ​​in the compared data are lower than the preset coal level values, a first signal is issued to prompt the loading of coal. If the comparison data does not exceed one-third of the first preset coal level values, a second signal is issued to indicate that there is no need to load coal.

[0008] In a preferred embodiment of the system for monitoring the coal level in the raw coal hopper of the present invention: the control unit is also embedded with an abnormal value filtering mechanism: when a distance sensor collects coal level values ​​exceeding the warning coal level ±30 cm for at least three consecutive times, the distance sensor is marked as a faulty sensor, and the warning coal level value is determined as follows: the lowest warning coal level value is one-fifth of the total height of the coal hopper, and the highest warning coal level is four-fifths of the total height of the coal hopper.

[0009] A device for monitoring the coal level of a raw coal hopper comprises a coal storage hopper, a coal storage hopper sealing cover is provided on the coal storage hopper, and a driving unit is provided at the center position of the bottom of the coal hopper sealing cover;

[0010] The driving unit is connected to the mounting bracket via a connecting turntable, and the mounting bracket is a closed figure with a fixed geometric center and vertices or boundary points that satisfy isometric symmetry;

[0011] The coal hopper sealing cover is also provided with a feed port.

[0012] In a preferred embodiment of the device for monitoring the coal level in the raw coal hopper of the present invention: the driving unit includes a driving end and a connecting turntable, the driving unit is connected to the connecting turntable through the driving end, and a mounting bracket is provided at one end of the connecting turntable away from the driving end, and a center bracket is provided on the mounting bracket.

[0013] In a preferred embodiment of the device for monitoring the coal level in the raw coal hopper of the present invention: the side collection unit, the middle collection unit and the central collection unit have the same specifications and sizes, and at least one group of the side collection unit and the middle collection unit are arranged at equal intervals with the central collection unit as the center.

[0014] In a preferred embodiment of the device for monitoring the coal level in the raw coal hopper of the present invention: the distance sensor is composed of a side collection unit, a middle collection unit and a center collection unit, the center collection unit is arranged at the center position of the center bracket, and the installation position of the center collection unit corresponds to the position of the discharge port.

[0015] In a preferred embodiment of the device for monitoring the coal level in the raw coal hopper of the present invention: the specifications and sizes of the side collection unit, the middle collection unit and the central collection unit are the same, and at least one group of the side collection unit and the middle collection unit are arranged at equal intervals with the central collection unit as the center of the circle, and the side collection unit and the middle collection unit are also arranged on the mounting bracket, the side collection unit is arranged at the connection of the end points of the mounting bracket, and the middle collection unit is arranged at the center position of the connecting line of the side collection units.

[0016] In a preferred embodiment of the device for monitoring the coal level in the raw coal hopper of the present invention: a discharge port is provided at one end of the storage coal hopper away from the coal hopper sealing cover, the position of the drive unit during installation corresponds to the position of the discharge port, at least two feed ports are symmetrically provided with respect to the drive unit, at least two storage coal hoppers are provided that are interconnected and of the same size, and partition plates are provided between the storage coal hoppers.

[0017] A coal loading method includes driving the mounting bracket to rotate by the driving unit so as to collect the coal level on the inner wall of the coal storage hopper by the side collection unit and the middle collection unit;

[0018] The coal level at the discharge port is collected through the central collection unit to enable the coal feeder and the coal pear machine to cooperate in coal loading.

[0019] In a preferred embodiment of the coal loading method of the present invention: the edge collection unit and the middle collection unit collect data in a three-out-two mode, collect the highest and lowest values ​​of the coal level and calculate them, and the coal is put into the coal pear device interlocked and waits for the coal level in the storage coal hopper to meet the standard before lifting it up to complete the coal loading.

[0020] The beneficial effects of the present invention are: collecting the internal coal level through multiple collection units, accurately grasping the coal level in the raw coal hopper and measuring the actual coal level in the coal hopper, coordinating with the interlocking coal loading devices to carry out coal loading operations, realizing automatic coal loading control, and reducing the workload of employees while making the coal loading work unattended. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings of the embodiments of the present invention. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Among them:

[0022] Figure 1 Shows the schematic diagram of the system structure for monitoring the coal level in the raw coal hopper;

[0023] Figure 2 The overall structural diagram of the device for monitoring the coal level in the raw coal hopper is shown;

[0024] Figure 3 The internal structure diagram of the device for monitoring the coal level in the raw coal hopper is shown;

[0025] Figure 4 The figure shows the overall structural diagram of the mounting bracket. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below with reference to specific embodiments and the accompanying drawings.

[0027] The terms used in the present invention are those commonly used in the art in view of the functions of the present invention, but these terms may vary according to the intentions of those skilled in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the present invention. Therefore, the terms used in the specification should not be understood as simple names, but rather as the meanings of the terms and the overall description of the present invention.

[0028] Reference Figure 1 and Figure 2The present embodiment provides a system and device for monitoring the coal level in the raw coal hopper and a method for loading coal therein, comprising a monitoring unit 1, comprising at least three distance sensors 3, which are distributed in a surface above the coal hopper for monitoring the coal level, a control unit 2, which obtains data from the distance sensors 3 and calculates the real-time coal level, wherein the first signal is calculated by a three-choose-two algorithm, which is as follows: the coal level in the coal hopper is collected by three groups of distance sensors 3 to obtain three groups of coal level data, and after randomly removing one group of data, the coal level values ​​in the two groups of data are compared separately. If more than one-third of the coal level values ​​in the compared data are lower than the preset coal level value, the coal level value is calculated by a three-choose-two algorithm. , a first signal prompting to add coal is issued. If the comparison data does not exceed the first preset coal level value of one-third, a second signal indicating that no coal needs to be added is issued. The control unit 2 is also embedded with an abnormal value filtering mechanism: when a distance sensor 3 has collected coal level values ​​exceeding the warning coal level ±30 cm for at least three consecutive times, the distance sensor 3 is marked as a faulty sensor. The warning coal level value is determined as follows: the lowest warning coal level value is one-fifth of the total height of the coal hopper, and the highest warning coal level is four-fifths of the total height of the coal hopper. When the real-time coal level is lower than the preset coal level, the control unit 2 sends a first signal;

[0029] A coal storage hopper 4 is provided with a coal hopper sealing cover 41. A driving unit 44 is provided at the bottom center of the coal hopper sealing cover 41. The driving unit 44 is connected to a mounting bracket 443 via a connecting turntable 442. The mounting bracket 443 is designed as a regular polygonal structure. A feed port 43 is also provided on the coal hopper sealing cover 41. The coal hopper sealing cover 41 is provided at the upper end of the coal storage hopper 4. The coal hopper sealing cover 41 is made of concrete and is cast integrally with the working platform.

[0030] The driving unit 44 drives the mounting bracket 443 to rotate, so as to realize the collection of the coal level on the inner wall of the storage coal hopper 4 by the side collection unit 31 and the middle collection unit 32, and the collection of the coal level at the discharge port 42 by the central collection unit 33, so as to realize the cooperation of the coal feeder and the pear coal machine for coal loading. The side collection unit 31 and the middle collection unit 32 collect data in a three-out-two mode, collect the highest and lowest values ​​of the coal level and calculate them, and the front coal pear coal machine is interlocked and waits for the coal level in the storage coal hopper 4 to meet the standard before lifting it up to complete the coal loading. The three-out-two data collection method is used to reduce the interference of false data on the calculation results, and the highest and lowest values ​​of the collected data are fed back to drive the corresponding vibration mechanism to vibrate the coal powder adsorbed on the inner wall of the coal hopper, thereby reducing the waste of internal coal powder. At the same time, the central collection unit 33 that directly collects the position of the discharge port 42 can also better collect data on the actual coal level inside the coal hopper and load the material in time.

[0031] refer to Figure 2 and Figure 3In one embodiment provided in the present application, the driving unit 44 includes a driving end 441, a connecting turntable 442 and a mounting bracket 443. The driving unit 44 is connected to the connecting turntable 442 through the driving end 441. The end of the connecting turntable 442 away from the driving end 441 is provided with a mounting bracket 443. The mounting bracket 443 is a closed figure with a fixed geometric center and vertices or boundary points that satisfy isometric symmetry. A central bracket 444 is provided at the center of the mounting bracket 443. A central acquisition unit 33 is also provided on the central bracket 444. The central acquisition unit 33 is arranged at the center position of the central bracket 444. The installation position of the central acquisition unit 33 is consistent with the output. The positions of the material ports 42 correspond to each other, and the connecting turntable 442 is driven to rotate by the driving end 441 on the driving unit 44. Since the mounting bracket 443 arranged on the connecting turntable 442 adopts a regular polygonal structural design, the vertical extension line of the center of the central collection unit 33 arranged on the central bracket 444 coincides with the vertical extension line of the center point of the material outlet 42, so as to collect the coal position at the position of the material outlet 42. The material feed ports 43 arranged on both sides of the driving unit 44 can also reduce the possibility of coal powder accumulating on the connecting turntable 442. At the same time, the upper end of the connecting turntable 442 is arranged to be a downward inclined structure, which further reduces the accumulation of coal powder on the connecting turntable 442.

[0032] refer to Figures 1 to 4 The mounting bracket 443 is further provided with a side collection unit 31 and a middle collection unit 32. The side collection unit 31 is provided at the connection point of the end points of the mounting bracket 443, and the middle collection unit 32 is provided at the center position of the connection line of the side collection unit 31. The side collection unit 31, the middle collection unit 32 and the center collection unit 33 have the same specifications and sizes. At least three side collection units 31 and the middle collection units 32 are provided at equal intervals with the center collection unit 33 as the center. By using multiple collection units of the same specifications to collect data on the internal coal position, the uniformity of the collected data is maintained, and the output signal values ​​are the same, thereby improving the reliability of the data.

[0033] The storage coal hoppers 4 are provided with at least two mutually connected and identical sized storage coal hoppers, a partition plate 45 is provided between the storage coal hoppers 4, a discharge port 42 is provided at one end of the storage coal hopper 4 away from the coal hopper sealing cover 41, and the position of the drive unit 44 during installation corresponds to the position of the discharge port 42, and at least two feed ports 43 are symmetrically provided with respect to the drive unit 44. The storage of coal powder is performed through two connected storage coal hoppers 4, which makes the loading work faster. At the same time, the upper end of the partition plate 45 provided between the storage coal hoppers 4 is designed with a sloped structure, which can prevent coal powder from accumulating on the partition plate 45.

[0034] When in use, a sensing device is used to accurately judge the coal level in the coal hopper, and the signal is connected to the coal pear machine control to automatically adjust the coal loading situation in the coal hopper. The specific method is: a triangular hanger is installed directly above the coal hopper, and a distance sensing device is installed at the corner of each hanger triangle. The three distance sensors are directly exposed to the coal inlet of the coal feeder, and the obtained parameters are transmitted to the DCS system. The accurate coal level is calculated by taking two out of three. The coal level in the coal hopper is collected by three groups of distance sensors 3 to obtain three groups of coal level data. After randomly removing one group of data, the coal level values ​​in the two retained groups of data are compared separately. If more than one-third of the coal level values ​​in the comparison data are lower than the preset coal level value, a first signal is issued to prompt coal loading. If the comparison data does not exceed one-third of the first preset coal level value, a second signal is issued to indicate that coal loading is not required. When a distance sensor 3 collects coal level values ​​that exceed the warning coal level ±30 cm for at least three consecutive times, The distance sensor 3 is marked as a fault sensor, wherein the warning coal level value is determined as follows: the lowest warning coal level value is one-fifth of the total height of the coal hopper, and the highest warning coal level is four-fifths of the total height of the coal hopper. A camera is installed in the middle of the triangular hanger, directly shooting at the coal inlet of the coal feeder to visually monitor the actual coal level in the coal hopper. The DCS system sets high and low coal level alarms. When the three values ​​of low coal level reach the lowest value, an alarm is triggered and the on-duty personnel starts the belt to load coal. The monitoring personnel adjust the speed of the coal feeder to prevent the coal feeder from running out of coal. Before loading coal, the coal pearing device is interlocked and the coal pearing device of the No. 1 coal hopper is automatically lowered. When the coal level of the No. 1 coal hopper reaches a certain height, the coal pearing device corresponding to the interlocking action is automatically raised. Then the coal pearing device of the No. 2 coal hopper is automatically lowered. When the coal level of the No. 2 coal hopper reaches a certain height, the coal pearing device corresponding to the interlocking action is automatically raised. This process is repeated in this way until all four coal hoppers are full, at which point the coal conveyor belt stops automatically, realizing on-site unmanned coal loading.

[0035] The distance sensing device of the present invention can be deployed in an existing DCS architecture and communicate with the controller of the DCS via a standard interface.

[0036] Finally, it should be pointed out that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways without departing from the scope of the present invention.

Claims

1. A system for monitoring the level of raw coal in a hopper, characterized by: include, A monitoring unit (1) includes at least three distance sensors (3) distributed in a surface above the coal hopper for monitoring the coal level; A control unit (2) acquires data from the distance sensor (3) and calculates the real-time coal position; When the real-time coal level is lower than the preset coal level, the control unit (2) sends a first signal.

2. The system for monitoring the raw coal hopper level according to claim 1, characterized in that: The first signal is calculated by a three-choose-two algorithm, which is as follows: the coal level in the coal hopper is collected by three sets of distance sensors (3) to obtain three sets of coal level data; after randomly removing one set of data, the coal level values ​​in the two remaining sets of data are individually compared; if more than one-third of the coal level values ​​in the compared data are lower than the preset coal level value, a first signal prompting to load coal is issued; if the coal level values ​​in the compared data do not exceed one-third of the first preset coal level value, a second signal prompting not to load coal is issued.

3. The system for monitoring the raw coal hopper level according to claim 1, characterized in that: The control unit (2) is also embedded with an abnormal value filtering mechanism: when a distance sensor (3) collects coal level values ​​exceeding the warning coal level by ±30 cm for at least three consecutive times, the distance sensor (3) is marked as a faulty sensor, wherein the warning coal level value is determined as follows: the lowest warning coal level value is one-fifth of the total height of the coal hopper, and the highest warning coal level is four-fifths of the total height of the coal hopper.

4. A device for monitoring the level of a raw coal hopper, the device for monitoring the level of a raw coal hopper according to any one of claims 1 to 3, characterized in that: include A coal storage hopper (4), wherein the coal storage hopper (4) is provided with a coal hopper sealing cover (41), and a driving unit (44) is provided at the center of the bottom of the coal hopper sealing cover (41); The driving unit (44) is connected to the mounting bracket (443) via a connecting turntable (442), and the mounting bracket (443) is a closed figure with a fixed geometric center and vertices or boundary points that satisfy isometric symmetry; The coal hopper sealing cover (41) is also provided with a feed port (43).

5. The device for monitoring the level of raw coal hopper according to claim 4, characterized in that: The driving unit (44) comprises a driving end (441) and a connecting turntable (442). The driving unit (44) is connected to the connecting turntable (442) via the driving end (441). An installation bracket (443) is provided at one end of the connecting turntable (442) away from the driving end (441). A center bracket (444) is provided on the installation bracket (443).

6. The device for monitoring the level of raw coal hopper according to claim 5, characterized in that: The distance sensor (3) is composed of a side collection unit (31), a middle collection unit (32) and a central collection unit (33). The central collection unit (33) is arranged at the center position of the central bracket (444). The installation position of the central collection unit (33) corresponds to the position of the discharge port (42).

7. The device for monitoring the level of raw coal hopper according to claim 6, characterized in that: The side collection unit (31), the middle collection unit (32) and the central collection unit (33) have the same specifications and sizes. The side collection unit (31) and the middle collection unit (32) are arranged in at least one group at equal intervals with the central collection unit (33) as the center of the circle. The side collection unit (31) and the middle collection unit (32) are also arranged on the mounting bracket (443). The side collection unit (31) is arranged at the connection point of the end points of the mounting bracket (443), and the middle collection unit (32) is arranged at the center position of the connection line of the side collection unit (31).

8. The device for monitoring the level of raw coal hopper according to claim 4, characterized in that: The coal storage hopper (4) is provided with a discharge port (42) at one end away from the coal hopper sealing cover (41); the position of the drive unit (44) during installation corresponds to the position of the discharge port (42); at least two feed ports (43) are symmetrically provided with respect to the drive unit (44); the coal storage hopper (4) is provided with at least two mutually interpenetrating and identical-sized storage ports; and a partition plate (45) is provided between the coal storage hoppers (4).

9. A coal loading method, comprising the device for monitoring the level of a raw coal hopper according to any one of claims 4 to 8, characterized in that: include The driving unit (44) drives the mounting bracket (443) to rotate, so as to collect the coal level on the inner wall of the coal storage hopper (4) through the side collection unit (31) and the middle collection unit (32); The coal level at the discharge port (42) is collected by a central collecting unit (33), so that the coal feeder and the coal plowing machine can cooperate to load the coal.

10. The coal loading method according to claim 9, characterized in that: The edge collection unit (31) and the middle collection unit (32) collect data in a two-out-of-three mode, collect the highest and lowest values ​​of the coal level and calculate them, and then the coal is put into the coal storage hopper (4) interlocked and lifted up after the coal level reaches the standard, thus completing the coal loading.

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