A coal feeder leakage prevention control method and device

Abstract

The application discloses a coal feeder leakage prevention control method and device, relates to the technical field of coal feeder control, and comprises the following steps: obtaining an internal resistance parameter of a coal falling hopper and a coal block accumulation height in front of a coal unloading plough; judging whether coal leakage or coal blockage exists in the coal falling hopper according to the internal resistance parameter of the coal falling hopper; and judging a coal leakage rate according to the coal block accumulation height in front of the coal unloading plough. If coal leakage exists in the coal falling hopper, a first preset cleaning strategy is used for processing; if the coal leakage rate on the coal unloading plough exceeds a threshold value, a second preset cleaning strategy is used for processing; and if coal blockage exists in the coal falling hopper, a third preset cleaning strategy is used for processing. The coal leakage accident is avoided, the coal blockage accident is reduced, and the safety is improved.

Description

Technical Field

[0001] This application relates to the field of coal feeder control technology, and more specifically, to a coal feeder leak prevention control method and device. Background Technology

[0002] A coal feeder is a mechanical device that accurately adjusts the coal feed rate of a coal mill according to load requirements. It is located between the raw coal hopper and the coal mill. In a direct-fired pulverizing system, the coal feed rate is directly adapted to the boiler load. There are various types of coal feeders, which can be classified into two types according to their structural characteristics and working principles: volumetric and gravity feeders.

[0003] In existing technology, to prevent coal spillage from the outer edge of the coal feeding car platform due to vertical jumping, anti-spillage baffles are often installed on the outer edge of the platform. These baffles are made of flat iron arranged around the outside of the platform and are higher than the platform itself. While this effectively prevents coal leakage, over time, the height of coal accumulation in front of the unloading plow increases, sometimes even overflowing the plow, leading to coal leakage again.

[0004] Therefore, how to prevent coal leakage is a technical problem that needs to be solved. Summary of the Invention

[0005] This invention provides a method for preventing coal leakage in a coal feeder, thereby solving the technical problem of severe coal leakage in existing technologies. The method includes:

[0006] Obtain the internal resistance parameters of the coal hopper and the coal block accumulation height in front of the unloading plow. Determine whether there is coal leakage or blockage in the coal hopper based on the internal resistance parameters of the coal hopper, and determine the coal leakage rate based on the coal block accumulation height in front of the unloading plow.

[0007] If there is coal leakage in the coal hopper, it will be handled by the first preset cleaning strategy;

[0008] If the coal leakage rate on the unloading plow exceeds the threshold, it will be handled by the second preset cleaning strategy.

[0009] If there is coal blockage in the coal hopper, it will be handled by the third preset cleaning strategy.

[0010] In some embodiments of this application, the internal resistance parameter of the coal hopper is the sum of frictional resistance and cohesion resistance. Determining whether there is coal leakage or blockage in the coal hopper based on the internal resistance parameter includes:

[0011] If the frictional resistance is less than the first preset resistance threshold and the cohesion resistance is less than the third preset resistance threshold, then there is coal leakage in the coal hopper.

[0012] If the frictional resistance is greater than the second preset resistance threshold and the cohesion resistance is greater than the fourth preset resistance threshold, then there is a coal blockage in the coal hopper.

[0013] Among them, the first preset resistance threshold is less than the second preset resistance threshold, and the third preset resistance threshold is less than the fourth preset resistance threshold.

[0014] In some embodiments of this application, determining whether there is coal leakage or blockage in the coal hopper based on the internal resistance parameters of the coal hopper further includes:

[0015] If the frictional resistance is between the first preset resistance threshold and the second preset resistance threshold, and the cohesion resistance is between the third preset resistance threshold and the fourth preset resistance threshold, then there is no coal leakage or blockage in the coal hopper.

[0016] If both frictional resistance and cohesion resistance are zero, then there is no coal leakage or blockage in the coal hopper.

[0017] In some embodiments of this application, the first preset cleaning strategy includes:

[0018] The amount of coal in the coal hopper is obtained, and the pressure of the air cannon is controlled according to the amount of coal in the coal hopper to complete the coal cleaning.

[0019] In some embodiments of this application, the coal leakage rate is determined based on the height of the coal block accumulation in front of the unloading plow, including:

[0020] Obtain the height of the retaining ring, and calculate the coal leakage rate based on the coal block accumulation height in front of the unloading plow and the retaining ring height.

[0021] In some embodiments of this application, the second preset cleaning strategy includes:

[0022] The rotational speed of the coal feeder is controlled based on the coal leakage rate.

[0023] In some embodiments of this application, the third preset cleaning strategy includes:

[0024] Determine if the coal feeder's coal drop pipe is blocked;

[0025] If both the coal hopper and the coal feeder's coal chute are blocked with coal, the corresponding air cannon pressure is controlled according to the size of the coal hopper and the size of the coal feeder's coal chute. The air cannon pressure is then corrected according to the amount of coal in the coal hopper and the amount of coal in the coal feeder's coal chute to obtain the final air cannon pressure. The cleaning is then carried out according to the final air cannon pressure.

[0026] If there is coal blockage in the coal hopper, the air cannon pressure is controlled according to the size of the coal hopper, and the air cannon pressure is corrected according to the amount of coal in the coal hopper to obtain the final air cannon pressure, and the cleaning is carried out according to the final air cannon pressure.

[0027] In some embodiments of this application, determining whether the coal feeder's coal drop pipe is blocked includes:

[0028] Receive the coal feeder cut-off signal from the DCS;

[0029] The changes in the operating parameters of the coal feeder are obtained within a preset time period. If the changes in the operating parameters of the coal feeder meet the requirements for coal blockage, then coal blockage in the coal chute is determined.

[0030] In some embodiments of this application, if the changes in operating parameters meet the requirements for coal blockage, including:

[0031] The operating parameters of the coal feeder include furnace negative pressure, flue gas oxygen content, main steam temperature, and superheat.

[0032] If the negative pressure in the furnace increases, the oxygen content in the flue gas rises, the main steam temperature decreases, and the superheat decreases, then it is determined that the coal chute is blocked.

[0033] Correspondingly, this application also provides a coal feeder leak prevention control device, the device comprising:

[0034] The detection module is used to obtain the internal resistance parameters of the coal hopper and the coal block accumulation height in front of the unloading plow. Based on the internal resistance parameters of the coal hopper, it determines whether there is coal leakage or blockage in the coal hopper. Based on the coal block accumulation height in front of the unloading plow, it determines the coal leakage rate.

[0035] The first control module is used to handle coal leakage in the coal hopper by means of a first preset cleaning strategy.

[0036] The second control module is used to handle the situation by using a second preset cleaning strategy if the coal leakage rate on the unloading plow exceeds the threshold.

[0037] The third control module is used to handle coal blockage in the coal hopper using a third preset cleaning strategy.

[0038] By applying the above technical solutions, the internal resistance parameters of the coal hopper and the coal block accumulation height in front of the unloading plow are obtained. The internal resistance parameters of the coal hopper are used to determine whether there is coal leakage or blockage within the hopper, and the coal leakage rate is determined based on the coal block accumulation height in front of the unloading plow. If coal leakage exists in the coal hopper, it is handled using a first preset cleaning strategy. If the coal leakage rate on the unloading plow exceeds a threshold, it is handled using a second preset cleaning strategy. If coal blockage exists in the coal hopper, it is handled using a third preset cleaning strategy. This application determines the presence of coal leakage or blockage by using the internal resistance parameters of the coal hopper, determines the coal leakage rate by using the coal block accumulation height in front of the unloading plow, and uses corresponding control measures to handle the situation, thus avoiding coal leakage accidents, reducing coal blockage accidents, and improving safety. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 A flowchart illustrating a coal feeder leakage prevention control method according to an embodiment of the present invention is shown.

[0041] Figure 2 This diagram illustrates the structure of a coal feeder leak prevention control device according to an embodiment of the present invention.

[0042] Figure 3 A schematic diagram of the process for determining whether the coal feeder's coal drop pipe is blocked, as proposed in an embodiment of the present invention, is shown. Detailed Implementation

[0043] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] This application provides a method for preventing leakage in a coal feeder, such as... Figure 1 As shown, the method includes the following steps:

[0045] Step S101: Obtain the internal resistance parameters of the coal hopper and the coal block accumulation height in front of the unloading plow. Determine whether there is coal leakage or blockage in the coal hopper based on the internal resistance parameters of the coal hopper, and determine the coal leakage rate based on the coal block accumulation height in front of the unloading plow.

[0046] In this embodiment, coal leakage or blockage in the coal hopper occurs at the lower conical part of the coal hopper. The upper and lower cross-sectional dimensions of the coal hopper differ significantly. As the coal falls from top to bottom (due to gravity and pressure from above), the flow of particles generates relative displacement, rearranging the particles and continuously shifting and squeezing them to adapt to the shrinking cross-section of the coal hopper.

[0047] Coal leakage from the coal hopper typically occurs during non-operational periods. The primary cause is that the cleaning baffle behind the unloading plow of the coal feeder scrapes coal into the non-operational side of the hopper, causing coal lumps to accumulate rapidly. Coal leakage and blockage in the hopper occur when the coal type is poorly designed, especially the worst-quality coal, which has low calorific value and a high hourly coal consumption. Therefore, the coal hopper has a large design volume and storage capacity. Limited by the wheelbase and column spacing between coal bunkers, the hopper is relatively high, and the weight of the stored coal results in significant pressure, leading to high internal friction and making blockage more likely. Blockage or leakage can be determined based on the friction within the hopper and the operating status.

[0048] To improve the accuracy of detection, in some embodiments of this application, the internal resistance parameter of the coal hopper is the sum of frictional resistance and cohesion resistance. Determining whether there is coal leakage or blockage in the coal hopper based on the internal resistance parameter includes: if the frictional resistance is less than a first preset resistance threshold and the cohesion resistance is less than a third preset resistance threshold, then there is coal leakage in the coal hopper; if the frictional resistance is greater than a second preset resistance threshold and the cohesion resistance is greater than a fourth preset resistance threshold, then there is coal blockage in the coal hopper; wherein the first preset resistance threshold is less than the second preset resistance threshold, and the third preset resistance threshold is less than the fourth preset resistance threshold.

[0049] In this embodiment, the resistance generated inside the hopper consists of internal friction resistance and cohesion resistance, and the resistance is:

[0050]

[0051] Where f is the sum of frictional resistance and cohesion resistance of unit volume bulk material due to area reduction, P is the normal pressure between the material and the bucket wall, f1 is the friction coefficient between particles, k is a constant related to particle shape, γ is the area shrinkage rate, and c1 is the cohesion resistance between particles.

[0052] Therefore, a larger cross-sectional reduction ratio results in greater frictional and cohesive resistance, making it increasingly difficult for the raw coal to flow naturally inside the raw coal hopper, thus causing blockage. Conversely, excessively low frictional and cohesive resistance indicates that the coal being transported is not in normal working condition, but rather leaking coal. In normal transport, coal above the coal would compress and increase resistance.

[0053] To improve the accuracy of detection, in some embodiments of this application, determining whether there is coal leakage or blockage in the coal hopper based on the internal resistance parameters of the coal hopper further includes: if the frictional resistance is between the first preset resistance threshold and the second preset resistance threshold, and the cohesion resistance is between the third preset resistance threshold and the fourth preset resistance threshold, then there is no coal leakage or blockage in the coal hopper; if both the frictional resistance and the cohesion resistance are zero, then there is no coal leakage or blockage in the coal hopper.

[0054] In this embodiment, if both resistances are too high, it indicates coal blockage; if both resistances are too low, it indicates coal leakage. If both resistances are within the specified range (between the first and second preset resistance thresholds, and between the third and fourth preset resistance thresholds), it indicates normal coal transportation.

[0055] To improve the accuracy of detection, in some embodiments of this application, the coal leakage rate is determined based on the coal block accumulation height in front of the unloading plow, including: obtaining the height of the retaining ring, and obtaining the coal leakage rate based on the coal block accumulation height in front of the unloading plow and the retaining ring height.

[0056] In this embodiment, the difference between the coal block accumulation height in front of the unloading plow and the retaining ring height is calculated. A positive number indicates that the coal block height is higher than the retaining ring height, while a negative number indicates that the coal block height is lower than the retaining ring height. The greater the difference between the coal block height and the retaining ring height (the larger the difference), the higher the coal leakage rate (the probability of coal leakage). The smaller the difference, the lower the probability of coal leakage. The retaining ring height is used as the dividing point.

[0057] Step S102: If there is coal leakage in the coal hopper, it is handled by the first preset cleaning strategy.

[0058] To improve the reliability of controlling coal leakage, in some embodiments of this application, the first preset cleaning strategy includes: obtaining the amount of coal in the coal hopper and controlling the pressure of the air cannon according to the amount of coal in the coal hopper to complete coal cleaning.

[0059] In this embodiment, if there is coal leakage in the coal hopper, it indicates that the coal hopper is not in operation, the amount of coal inside is small, and there is no coal above the hopper. At this time, it is necessary to control the pressure of the air cannon according to the amount of coal. Too high a pressure may cause some safety accidents or wash the coal into other equipment areas, while too low a pressure may result in poor cleaning effect.

[0060] An air cannon, also known as an air flow aid, arch breaker, or blockage clearer, is a device that uses a sudden burst of compressed gas at a speed exceeding Mach 1 (sonic speed) to directly penetrate the blocked area of ​​stored bulk materials. This sudden release of an expansion shock wave overcomes the static friction of the material, allowing the material inside the container to flow again.

[0061] The specific process of controlling the air cannon pressure based on the amount of coal in the coal hopper is as follows:

[0062] Let the amount of coal in the coal hopper be A, and let the preset coal amount array in the coal hopper be A0(A1, A2, A3, A4), where the first preset coal amount in the coal hopper is A1, the second preset coal amount in the coal hopper is A2, the third preset coal amount in the coal hopper is A3, and the fourth preset coal amount in the coal hopper is A4, and A1 < A2 < A3 < A4.

[0063] The preset air cannon pressure array is Q01(Q11, Q12, Q13, Q14), where the first preset air cannon pressure is Q11, the second preset air cannon pressure is Q12, the third preset air cannon pressure is Q13, the fourth preset air cannon pressure is Q14, and Q11 < Q12 < Q13 < Q14.

[0064] The air cannon pressure is determined based on the relationship between the amount of coal in the coal hopper and the amount of coal in each preset coal hopper.

[0065] If A < A1, the first preset air cannon pressure Q11 is determined as the air cannon pressure;

[0066] If A1≤A<A2, determine the second preset air cannon pressure Q12 as the air cannon pressure;

[0067] If A2≤A<A3, determine the third preset air cannon pressure Q13 as the air cannon pressure;

[0068] If A3≤A<A4, determine the fourth preset air cannon pressure Q14 as the air cannon pressure.

[0069] Step S103: If the coal leakage rate on the unloading plow exceeds the threshold, the second preset cleaning strategy will be used for processing.

[0070] In this embodiment, if the coal leakage rate on the unloading plow exceeds the threshold, it indicates that the probability of coal leakage is too high and needs to be controlled to reduce the height of the coal block.

[0071] In order to improve cleaning efficiency, in some embodiments of this application, the second preset cleaning strategy includes: controlling the rotation speed of the coal feeder car according to the coal leakage rate.

[0072] In this embodiment, adding a baffle ring will increase the height of coal lumps piled up in front of the unloading plow on the coal feeder platform, and may even cause them to overflow the unloading plow. To reduce the adverse effects caused by this modification, appropriately increasing the rotation speed of the coal feeder can accelerate the unloading of coal lumps piled up in front of the unloading plow on the platform into the coal hopper, effectively reducing the height of coal lumps piled up. After the improvement, the coal seam height will be reduced to the original standard.

[0073] The rotational speed of the coal feeder is controlled based on the coal leakage rate, specifically as follows:

[0074] Set the coal leakage rate to B, and preset the coal leakage rate array B0(B1, B2, B3, B4), where the first preset coal leakage rate is B1, the second preset coal leakage rate is B2, the third preset coal leakage rate is B3, the fourth preset coal leakage rate is B4, and B1 < B2 < B3 < B4.

[0075] A preset coal feeder speed array V0(V1, V2, V3, V4) is provided, wherein the first preset coal feeder speed is V1, the second preset coal feeder speed is V2, the third preset coal feeder speed is V3, and the fourth preset coal feeder speed is V4, and V1 < V2 < V3 < V4.

[0076] The rotational speed of the coal feeder is determined based on the relationship between the coal leakage rate and various preset coal leakage rates.

[0077] If B < B1, determine the first preset coal feeder speed V1 as the coal feeder speed;

[0078] If B1≤B<B2, determine the second preset coal feeder speed V2 as the coal feeder speed;

[0079] If B2≤B<B3, determine the third preset coal feeder speed V3 as the coal feeder speed;

[0080] If B3≤B<B4, determine the fourth preset coal feeder speed V4 as the coal feeder speed.

[0081] Step S104: If there is coal blockage in the coal hopper, it will be handled by the third preset cleaning strategy.

[0082] To improve the ability to clear coal blockages, in some embodiments of this application, such as... Figure 3 As shown, the third preset cleaning strategy includes:

[0083] Step S201: Determine whether the coal feeder's coal drop pipe is blocked.

[0084] In some embodiments of this application, determining whether the coal feeder's coal drop pipe is blocked includes: receiving a coal feeder cut-off signal from the DCS; obtaining the changes in the coal feeder's operating parameters over a preset period of time; and if the changes in the coal feeder's operating parameters meet the requirements for coal blockage, then determining that the coal drop pipe is blocked.

[0085] In this embodiment, when the coal chute is blocked, the DCS will display a coal cut-off signal. To prevent DCS display errors, changes in operating parameters are considered as a standard. When the coal chute is blocked, the coal feeder's coal quantity decreases rapidly, the furnace negative pressure increases, the oxygen content in the flue gas increases, the main steam temperature decreases, and the superheat decreases.

[0086] In some embodiments of this application, if the changes in operating parameters meet the requirements for coal blockage, including:

[0087] The operating parameters of the coal feeder include furnace negative pressure, flue gas oxygen content, main steam temperature, and superheat.

[0088] If the negative pressure in the furnace increases, the oxygen content in the flue gas rises, the main steam temperature decreases, and the superheat decreases, then it is determined that the coal chute is blocked.

[0089] Step S202: If both the coal hopper and the coal feeder's coal hopper pipe are blocked with coal, the corresponding air cannon pressure is controlled according to the size of the coal hopper and the size of the coal feeder's coal hopper pipe. The air cannon pressure is then corrected according to the amount of coal in the coal hopper and the amount of coal in the coal feeder's coal hopper pipe to obtain the final air cannon pressure. The cleaning is then performed according to the final air cannon pressure.

[0090] In this embodiment, if both the coal hopper and the coal feeder's chuting pipe are blocked with coal, it is necessary to control the air cannons at the corresponding locations of the two devices. The dimensions of the coal hopper and the chuting pipe will affect the cleaning capability of the air cannons.

[0091] The air cannon pressure is controlled according to the size of the coal hopper, and adjusted according to the amount of coal in the hopper. Specifically:

[0092] Set the size of the coal hopper to C, and set the preset coal hopper size array C0(C1, C2, C3, C4), where the first preset coal hopper size is C1, the second preset coal hopper size is C2, the third preset coal hopper size is C3, the fourth preset coal hopper size is C4, and C1 < C2 < C3 < C4.

[0093] The preset air cannon pressure array is Q02(Q21, Q22, Q23, Q24), where the first preset air cannon pressure is Q21, the second preset air cannon pressure is Q22, the third preset air cannon pressure is Q23, the fourth preset air cannon pressure is Q24, and Q21 < Q22 < Q23 < Q24.

[0094] The air cannon pressure is determined based on the relationship between the coal hopper size and the sizes of each preset coal hopper.

[0095] If C < C1, the first preset air cannon pressure Q21 is determined as the air cannon pressure;

[0096] If C1≤C<C2, determine the second preset air cannon pressure Q22 as the air cannon pressure;

[0097] If C2≤C<C3, determine the third preset air cannon pressure Q23 as the air cannon pressure;

[0098] If C3≤C<C4, determine the fourth preset air cannon pressure Q24 as the air cannon pressure.

[0099] The air cannon pressure is adjusted based on the amount of coal in the coal hopper. Note that this adjustment is made when coal blockage occurs. Therefore, the coal hopper is approximately full (due to the shape of the coal, there are gaps in the hopper). Thus, it is not necessary to control the air cannon pressure based on the amount of coal; adjustment is sufficient.

[0100] The pressure correction coefficient of the air cannon is obtained based on the amount of coal in the coal hopper, and the air cannon is corrected based on the correction coefficient.

[0101] Let the amount of coal in the coal hopper be D, and let the preset coal amount array in the coal hopper be D0(D1, D2, D3, D4), where the first preset coal amount in the coal hopper is D1, the second preset coal amount in the coal hopper is D2, the third preset coal amount in the coal hopper is D3, and the fourth preset coal amount in the coal hopper is D4, and D1 < D2 < D3 < D4.

[0102] A preset air cannon pressure correction coefficient value array K0(K1, K2, K3, K4) is provided, wherein the first preset air cannon pressure correction coefficient value is K1, the second preset air cannon pressure correction coefficient value is K2, the third preset air cannon pressure correction coefficient value is K3, and the fourth preset air cannon pressure correction coefficient value is K4, and 1 < K1 < K2 < K3 < K4 < 1.8.

[0103] The air cannon pressure is set to P0. Based on the relationship between the amount of coal in the coal hopper and the amount of coal in each preset coal hopper, the air cannon pressure correction coefficient value is determined, and the corrected final air cannon pressure is obtained.

[0104] If D < D1, determine the first preset air cannon pressure correction coefficient value K1 as the air cannon pressure correction coefficient value, and the final air cannon pressure is P0*K1;

[0105] If D1≤D<D2, determine the second preset air cannon pressure correction coefficient value K2 as the air cannon pressure correction coefficient value, and the final air cannon pressure is P0*K2;

[0106] If D2≤D<D3, determine the third preset air cannon pressure correction coefficient value K3 as the air cannon pressure correction coefficient value, and the final air cannon pressure is P0*K3;

[0107] If D3≤D<D4, determine the fourth preset air cannon pressure correction coefficient value K4 as the air cannon pressure correction coefficient value, and the final air cannon pressure is P0*K4.

[0108] The air cannon pressure is controlled according to the size of the coal feeder's chutes, and the air cannon pressure is corrected according to the amount of coal in the coal feeder's chutes to obtain the final air cannon pressure. The same principle applies to the coal hopper, so it will not be repeated here.

[0109] It should be noted that the above-mentioned control parameters are only one means of implementation, and other solutions that can achieve the above objectives and conform to the ideas of this application are all within the scope of protection of this application.

[0110] Step S203: If there is coal blockage in the coal hopper, the air cannon pressure is controlled according to the size of the coal hopper, and the air cannon pressure is corrected according to the amount of coal in the coal hopper to obtain the final air cannon pressure, and the cleaning is carried out according to the final air cannon pressure.

[0111] In this embodiment, the control is the same as described above, and will not be repeated here.

[0112] By applying the above technical solutions, the internal resistance parameters of the coal hopper and the coal block accumulation height in front of the unloading plow are obtained. The internal resistance parameters of the coal hopper are used to determine whether there is coal leakage or blockage within the hopper, and the coal leakage rate is determined based on the coal block accumulation height in front of the unloading plow. If coal leakage exists in the coal hopper, it is handled using a first preset cleaning strategy. If the coal leakage rate on the unloading plow exceeds a threshold, it is handled using a second preset cleaning strategy. If coal blockage exists in the coal hopper, it is handled using a third preset cleaning strategy. This application determines the presence of coal leakage or blockage by using the internal resistance parameters of the coal hopper, determines the coal leakage rate by using the coal block accumulation height in front of the unloading plow, and uses corresponding control measures to handle the situation, thus avoiding coal leakage accidents, reducing coal blockage accidents, and improving safety.

[0113] Through the above description of the embodiments, those skilled in the art can clearly understand that the present invention can be implemented in hardware or by means of software plus necessary general-purpose hardware platforms. Based on this understanding, the technical solution of the present invention can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, external hard drive, etc.) and includes several instructions to cause a computer device (such as a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0114] To further illustrate the technical concept of this invention, the technical solution of this invention will now be described in conjunction with specific application scenarios.

[0115] Correspondingly, this application also provides a coal feeder leak prevention control device, such as... Figure 2 As shown, the device includes:

[0116] The detection module 201 is used to obtain the internal resistance parameters of the coal hopper and the coal block accumulation height in front of the unloading plow. Based on the internal resistance parameters of the coal hopper, it determines whether there is coal leakage or blockage in the coal hopper. Based on the coal block accumulation height in front of the unloading plow, it determines the coal leakage rate.

[0117] The first control module 202 is used to handle coal leakage in the coal hopper by means of a first preset cleaning strategy.

[0118] The second control module 203 is used to handle the situation by a second preset cleaning strategy if the coal leakage rate on the unloading plow exceeds the threshold.

[0119] The third control module 204 is used to handle coal blockage in the coal hopper by using a third preset cleaning strategy.

[0120] This device also includes the following components to implement the above method:

[0121] In some embodiments of this application, the detection module 201 is used for:

[0122] If the frictional resistance is less than the first preset resistance threshold and the cohesion resistance is less than the third preset resistance threshold, then there is coal leakage in the coal hopper.

[0123] If the frictional resistance is greater than the second preset resistance threshold and the cohesion resistance is greater than the fourth preset resistance threshold, then there is a coal blockage in the coal hopper.

[0124] Among them, the first preset resistance threshold is less than the second preset resistance threshold, and the third preset resistance threshold is less than the fourth preset resistance threshold.

[0125] In some embodiments of this application, the detection module 201 is used for:

[0126] If the frictional resistance is between the first preset resistance threshold and the second preset resistance threshold, and the cohesion resistance is between the third preset resistance threshold and the fourth preset resistance threshold, then there is no coal leakage or blockage in the coal hopper.

[0127] If both frictional resistance and cohesion resistance are zero, then there is no coal leakage or blockage in the coal hopper.

[0128] In some embodiments of this application, the first control module 202 is used for:

[0129] The amount of coal in the coal hopper is obtained, and the pressure of the air cannon is controlled according to the amount of coal in the coal hopper to complete the coal cleaning.

[0130] In some embodiments of this application, the detection module 201 is used for:

[0131] Obtain the height of the retaining ring, and calculate the coal leakage rate based on the coal block accumulation height in front of the unloading plow and the retaining ring height.

[0132] In some embodiments of this application, the second control module 203 is used for:

[0133] The rotational speed of the coal feeder is controlled based on the coal leakage rate.

[0134] In some embodiments of this application, the third control module 204 is used for:

[0135] Determine if the coal feeder's coal drop pipe is blocked;

[0136] If both the coal hopper and the coal feeder's coal chute are blocked with coal, the corresponding air cannon pressure is controlled according to the size of the coal hopper and the size of the coal feeder's coal chute. The air cannon pressure is then corrected according to the amount of coal in the coal hopper and the amount of coal in the coal feeder's coal chute to obtain the final air cannon pressure. The cleaning is then carried out according to the final air cannon pressure.

[0137] If there is coal blockage in the coal hopper, the air cannon pressure is controlled according to the size of the coal hopper, and the air cannon pressure is corrected according to the amount of coal in the coal hopper to obtain the final air cannon pressure, and the cleaning is carried out according to the final air cannon pressure.

[0138] In some embodiments of this application, the third control module 204 is used for:

[0139] Receive the coal feeder cut-off signal from the DCS;

[0140] The changes in the operating parameters of the coal feeder are obtained within a preset time period. If the changes in the operating parameters of the coal feeder meet the requirements for coal blockage, then coal blockage in the coal chute is determined.

[0141] In some embodiments of this application, the third control module 204 is used for:

[0142] The operating parameters of the coal feeder include furnace negative pressure, flue gas oxygen content, main steam temperature, and superheat.

[0143] If the negative pressure in the furnace increases, the oxygen content in the flue gas rises, the main steam temperature decreases, and the superheat decreases, then it is determined that the coal chute is blocked.

[0144] Those skilled in the art will understand that the modules in the apparatus of the implementation scenario can be distributed within the apparatus of the implementation scenario as described, or they can be located in one or more apparatuses different from this implementation scenario, with corresponding changes. The modules of the above-described implementation scenario can be combined into one module, or they can be further divided into multiple sub-modules.

[0145] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A method for preventing leakage in a coal feeder, characterized in that, The method includes: Obtain the internal resistance parameters of the coal hopper and the coal block accumulation height in front of the unloading plow. Determine whether there is coal leakage or blockage in the coal hopper based on the internal resistance parameters of the coal hopper, and determine the coal leakage rate based on the coal block accumulation height in front of the unloading plow. If there is coal leakage in the coal hopper, it will be handled by the first preset cleaning strategy; If the coal leakage rate on the unloading plow exceeds the threshold, it will be handled by the second preset cleaning strategy. If there is coal blockage in the coal hopper, it will be handled by the third preset cleaning strategy; The internal resistance parameter of the coal hopper is the sum of frictional resistance and cohesion resistance. Determining whether there is coal leakage or blockage in the coal hopper based on the internal resistance parameter includes: If the frictional resistance is less than the first preset resistance threshold and the cohesion resistance is less than the third preset resistance threshold, then there is coal leakage in the coal hopper. If the frictional resistance is greater than the second preset resistance threshold and the cohesion resistance is greater than the fourth preset resistance threshold, then there is a coal blockage in the coal hopper. Among them, the first preset resistance threshold is less than the second preset resistance threshold, and the third preset resistance threshold is less than the fourth preset resistance threshold. Determining whether there is coal leakage or blockage in the coal hopper based on the internal resistance parameters of the coal hopper also includes: If the frictional resistance is between the first preset resistance threshold and the second preset resistance threshold, and the cohesion resistance is between the third preset resistance threshold and the fourth preset resistance threshold, then there is no coal leakage or blockage in the coal hopper. If both frictional resistance and cohesion resistance are zero, then there is no coal leakage or blockage in the coal hopper.

2. The method as described in claim 1, characterized in that, The first preset cleaning strategy includes: The amount of coal in the coal hopper is obtained, and the pressure of the air cannon is controlled according to the amount of coal in the coal hopper to complete the coal cleaning.

3. The method as described in claim 1, characterized in that, The coal leakage rate is determined based on the height of the coal pile in front of the unloading plow, including: Obtain the height of the retaining ring, and calculate the coal leakage rate based on the coal block accumulation height in front of the unloading plow and the retaining ring height.

4. The method as described in claim 3, characterized in that, The second preset cleaning strategy includes: The rotational speed of the coal feeder is controlled based on the coal leakage rate.

5. The method as described in claim 1, characterized in that, The third preset cleaning strategy includes: Determine if the coal feeder's coal drop pipe is blocked; If both the coal hopper and the coal feeder's coal chute are blocked with coal, the corresponding air cannon pressure is controlled according to the size of the coal hopper and the size of the coal feeder's coal chute. The air cannon pressure is then corrected according to the amount of coal in the coal hopper and the amount of coal in the coal feeder's coal chute to obtain the final air cannon pressure. The cleaning is then carried out according to the final air cannon pressure. If there is coal blockage in the coal hopper, the air cannon pressure is controlled according to the size of the coal hopper, and the air cannon pressure is corrected according to the amount of coal in the coal hopper to obtain the final air cannon pressure, and the cleaning is carried out according to the final air cannon pressure.

6. The method as described in claim 5, characterized in that, Determining whether the coal feeder's coal chute is blocked includes: Receive the coal feeder cut-off signal from the DCS; The changes in the operating parameters of the coal feeder are obtained within a preset time period. If the changes in the operating parameters of the coal feeder meet the requirements for coal blockage, then coal blockage in the coal chute is determined.

7. The method as described in claim 6, characterized in that, If the changes in operating parameters meet the requirements for coal blockage, including: The operating parameters of the coal feeder include furnace negative pressure, flue gas oxygen content, main steam temperature, and superheat. If the negative pressure in the furnace increases, the oxygen content in the flue gas rises, the main steam temperature decreases, and the superheat decreases, then it is determined that the coal chute is blocked.

8. A coal feeder leak prevention control device, characterized in that, The device includes: The detection module is used to obtain the internal resistance parameters of the coal hopper and the coal block accumulation height in front of the unloading plow. Based on the internal resistance parameters of the coal hopper, it determines whether there is coal leakage or blockage in the coal hopper. Based on the coal block accumulation height in front of the unloading plow, it determines the coal leakage rate. The first control module is used to handle coal leakage in the coal hopper by means of a first preset cleaning strategy. The second control module is used to handle the situation by using a second preset cleaning strategy if the coal leakage rate on the unloading plow exceeds the threshold. The third control module is used to handle coal blockage in the coal hopper using a third preset cleaning strategy. The internal resistance parameter of the coal hopper is the sum of frictional resistance and cohesion resistance. Determining whether there is coal leakage or blockage in the coal hopper based on the internal resistance parameter includes: If the frictional resistance is less than the first preset resistance threshold and the cohesion resistance is less than the third preset resistance threshold, then there is coal leakage in the coal hopper. If the frictional resistance is greater than the second preset resistance threshold and the cohesion resistance is greater than the fourth preset resistance threshold, then there is a coal blockage in the coal hopper. Among them, the first preset resistance threshold is less than the second preset resistance threshold, and the third preset resistance threshold is less than the fourth preset resistance threshold. Determining whether there is coal leakage or blockage in the coal hopper based on the internal resistance parameters of the coal hopper also includes: If the frictional resistance is between the first preset resistance threshold and the second preset resistance threshold, and the cohesion resistance is between the third preset resistance threshold and the fourth preset resistance threshold, then there is no coal leakage or blockage in the coal hopper. If both frictional resistance and cohesion resistance are zero, then there is no coal leakage or blockage in the coal hopper.

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