Roller feeder discharge capacity control method, control device and flue gas purification system

Abstract

The application discloses a kind of roll feeder discharge capacity control method, control device and flue gas purification system, the control method, comprising: using laser ranging device real-time scanning chain bucket conveyor chain bucket loaded activated carbon, after conversion, the activated carbon volume V 料 Loaded in chain bucket;According to the activated carbon volume V 料 Loaded in chain bucket and density ρ, calculate the activated carbon transport capacity of each roll feeder discharge chain bucket conveyor loaded in chain bucket;According to the activated carbon transport capacity of chain bucket loaded, calculate the actual discharge capacity W i 辊 Of each roll feeder;According to the actual discharge capacity W i 辊 Of roll feeder and current operating parameter, calculate the actual discharge efficiency η 实际 Of roll feeder;Based on the actual discharge efficiency η 实际 Obtained, the variable parameter of roll feeder is adjusted, so that actual discharge capacity reaches target discharge capacity Q i The control method can more accurately control the actual discharge capacity W i 辊 Of roll feeder, improve activated carbon utilization and system efficiency, improve flue gas purification effect.

Description

Technical Field

[0001] This invention relates to the field of flue gas purification technology, and more particularly to a method and device for controlling the discharge rate of a roller feeder in an activated carbon flue gas purification system. This invention also relates to a flue gas purification system employing the aforementioned control method or equipped with the aforementioned control device. Background Technology

[0002] Steel companies typically use activated carbon flue gas purification technology to remove SO2 from sintering flue gas, thereby achieving clean emissions of waste gas from the company's sintering plant.

[0003] During the purification process, the discharge rates of the roller feeders in each chamber of the adsorption unit, the discharge rate of the desorption tower, the amount of activated carbon replenished in the activated carbon chamber, and the operating speed of the chain bucket conveyor need to be coordinated to maintain a relative balance of materials. Moreover, the discharge flow rate of each chamber of the adsorption unit also affects the flue gas purification effect. If the discharge flow rate is too high, the residence time of activated carbon particles in the chamber is insufficient, and some activated carbon particles are discharged without fully exerting their adsorption function, resulting in low activated carbon utilization and low system efficiency. If the discharge flow rate is too low, the residence time of activated carbon particles in the chamber is too long, and the activated carbon particles are in a saturated state of adsorption, and SO2 in the flue gas cannot be completely adsorbed, resulting in poor flue gas purification effect.

[0004] Currently, the discharge speed of activated carbon in adsorption towers is controlled by roller feeders. The discharge speed of roller feeders is related to their opening height, rotation speed, activated carbon density, and discharge efficiency. Among these, the discharge efficiency is given by the manufacturer and is generally set to 0.7 to 0.9. This value is also related to the equipment installation accuracy, etc. Therefore, in actual operation, the fluctuation of this value has a significant impact on the calculation of the discharge volume of roller feeders. Summary of the Invention

[0005] The purpose of this invention is to provide a method for controlling the discharge volume of a roller feeder, so as to improve the control accuracy of the discharge volume of the roller feeder.

[0006] Another object of the present invention is to provide a discharge control device for a roller feeder.

[0007] Another object of the present invention is to provide a flue gas purification system employing the control method or equipped with the control device.

[0008] To achieve the above objectives, the present invention provides a method for controlling the discharge rate of a roller feeder, comprising:

[0009] A laser rangefinder was used to scan the activated carbon loaded in the buckets of the chain conveyor in real time, and the volume V of the activated carbon loaded in the buckets was calculated. 料 ;

[0010] Based on the volume V of activated carbon loaded in the chain bucket 料Given the density ρ, calculate the amount of activated carbon transported in the chain bucket of the chain bucket conveyor after each roller feeder discharges;

[0011] Calculate the actual discharge volume W of each roller feeder based on the amount of activated carbon transported in the chain hopper. i 辊 ;

[0012] Based on the actual discharge capacity W of the roller feeder i 辊 Based on the current operating parameters, calculate the actual discharge efficiency η of the roller feeder. 实际 ;

[0013] Based on the obtained actual discharge efficiency η 实际 Adjust the variable parameters of the roller feeder to make the actual discharge rate reach the target discharge rate Q. i .

[0014] Furthermore, the laser rangefinder is used to scan the activated carbon loaded in the chain bucket of the chain conveyor in real time, and the volume V of the activated carbon loaded in the chain bucket is calculated. 料 ,include:

[0015] After scanning the activated carbon within a single chain hopper, it was divided into several simulated small cylinders. The height from the material surface to the edge of the hopper was:

[0016] H1=L1×COSα-L

[0017] The width selected on the x-axis is:

[0018] Δx=M=|L1×Sinα-L2×Sinβ|

[0019] The width selected along the running direction of the chain bucket conveyor is determined based on the running speed v of the chain bucket conveyor and the interval t used:

[0020] Δz=vt

[0021] The volume of a single small cylinder is:

[0022] V1=H1×Δx×Δz=(L1×COSα-L)×|L1×Sinα-L2×Sinβ|×vt

[0023] The volume of the unloaded area of ​​the hopper is:

[0024] V 空 =∑(L i ×COSα i -L)×|L i ×Sinα-L i+1 ×Sinα i+1 |×vt

[0025] The volume of material loaded in the chain bucket is:

[0026] V 料 =V 固 -V 空 V 固 This refers to the volume of the hopper when it is full.

[0027] Furthermore, the volume V of activated carbon loaded in the chain hopper... 料 Given the density ρ, calculate the amount of activated carbon transported in the chain bucket of the chain bucket conveyor after each roller feeder discharges, including:

[0028] Let the density of activated carbon be ρ, according to the formula Calculate the conveying capacity of the chain bucket conveyor per unit time, where num represents the number of chain buckets passing through within time t.

[0029] Based on the calculated conveying capacity of the chain bucket conveyor, calculate the actual discharge capacity W of the corresponding roller feeder. i 辊 .

[0030] Furthermore, based on the calculated conveying capacity of the chain bucket conveyor, the actual discharge capacity W of the corresponding roller feeder is calculated. i 辊 ,include:

[0031] For the roller feeder at the first material receiving position, its actual discharge volume is equal to the conveying volume of the chain bucket conveyor calculated at that position: W1 = W1 辊 ;

[0032] For the roller feeder at the second material receiving position, its actual discharge volume is W2 - W1 = W2 辊 In the formula, W2 is the conveying capacity of the chain bucket conveyor calculated at that position;

[0033] By analogy, the actual discharge volume of the roller feeder at each subsequent material receiving position can be obtained.

[0034] Furthermore, the actual discharge volume W of the roller feeder... i 辊 Based on the current operating parameters, calculate the actual discharge efficiency η of the roller feeder. 实际 The calculation formula is:

[0035]

[0036] In the formula:

[0037] B i - Discharge width of roller feeder, in meters;

[0038] hi - Roller feeder opening height, in meters;

[0039] n i -Roller feeder speed, in r / min;

[0040] D i - Roller feeder roller diameter, unit: m;

[0041] ρ - Density of activated carbon, in kg / m³ 3 .

[0042] Furthermore, the actual discharge efficiency η obtained is... 实际 Adjust the variable parameters of the roller feeder to make the actual discharge rate reach the target discharge rate Q. i ,include:

[0043] Adjust the variable parameters, and after each adjustment, recalculate the actual discharge volume and the target discharge volume Q based on the actual discharge volume. i If the deviation value is greater than the allowable range, the variable parameters of the roller feeder are adjusted again according to the deviation value until the deviation value is less than the allowable range.

[0044] Furthermore, the variable parameters of the roller feeder include the rotational speed n. i When it is necessary to adjust the discharge rate of the roller feeder, the actual discharge efficiency η of each roller feeder is obtained in real time. 实际 The target rotational speed n is obtained according to the following formula. i Q ;

[0045]

[0046] In the formula:

[0047] ΔQ i - The difference ΔQ that needs to be adjusted i =Q i -W i 辊 ;

[0048] Q i -Target discharge rate;

[0049] W i 辊 -Current material discharge rate in the storage compartment;

[0050] n i W - Current rotational speed;

[0051] n i Q - Target speed.

[0052] To achieve the above-mentioned other objective, the present invention provides a roller feeder discharge rate control device, comprising:

[0053] A laser rangefinder is installed at the position after each roller feeder discharges material to scan the activated carbon loaded in the chain bucket of the chain bucket conveyor in real time.

[0054] The control device receives the signal from the laser ranging device and calculates the volume V of activated carbon loaded in the chain bucket. 料 According to the volume V of activated carbon loaded in the chain hopper 料 Given the density ρ, calculate the amount of activated carbon transported in the chain bucket of the chain conveyor after each roller feeder discharges; based on the amount of activated carbon transported in the chain bucket, calculate the actual discharge volume W of each roller feeder. i 辊 According to the actual discharge capacity W of the roller feeder i 辊 Based on the current operating parameters, calculate the actual discharge efficiency η of the roller feeder. 实际 ; and based on the obtained actual discharge efficiency η 实际 Adjust the variable parameters of the roller feeder to make the actual discharge rate reach the target discharge rate Q. i .

[0055] To achieve the above-mentioned objective, the present invention provides a flue gas purification system, comprising an adsorption system composed of multiple adsorption units connected in parallel, a desorption system, an activated carbon bin, and a chain bucket conveyor. The adsorption unit is equipped with a roller feeder. The system is characterized in that the actual discharge volume of the roller feeder is adjusted by the roller feeder discharge volume control method described in any of the above-mentioned methods, or the roller feeder discharge volume control device described above is provided.

[0056] The activated carbon discharge control method and apparatus provided by this invention uses laser ranging to calculate the volume of activated carbon loaded in the chain bucket of the chain conveyor after each roller feeder discharges, and then calculates the amount of activated carbon transported in the chain bucket and the actual discharge volume W of the roller feeder. i 辊 Based on the calculated actual discharge volume W of the roller feeder i 辊 This allows for the reverse calculation of the real-time discharge efficiency η of each roller feeder. 实际 Then use the real-time discharge efficiency η 实际 The discharge efficiency η of the double roller feeder 出厂 Make corrections based on the new real-time discharge efficiency η 实际 When adjusting the discharge rate of the roller feeder, the actual discharge rate W can be controlled more precisely by using the variable parameters of the roller feeder. i辊 This makes the actual discharge volume W i 辊 To achieve the target discharge volume Q i This makes the actual discharge capacity W of the roller feeder i 辊 It can match the discharge rate of the analytical tower, the amount of activated carbon replenished by the activated carbon bin, and the operating speed of the chain bucket conveyor, thereby maintaining the relative balance of materials, improving the utilization rate of activated carbon and system efficiency, and improving the flue gas purification effect. Attached Figure Description

[0057] Figure 1 This is a partial structural schematic diagram of a flue gas purification system provided in an embodiment of the present invention;

[0058] Figure 2 This is a schematic diagram of the basic structure of a roller feeder discharge volume control device provided in an embodiment of the present invention;

[0059] Figure 3 This is a schematic cross-sectional view of the laser rangefinder scanning the activated carbon loaded in the chain bucket at time ti.

[0060] Figure 4 This is a schematic cross-sectional view of the laser rangefinder scanning the activated carbon loaded in the chain bucket at time ti+1.

[0061] Figure 5 This is a schematic diagram showing the chain bucket passing through each roller feeder in sequence.

[0062] In the picture:

[0063] 1. Adsorption Unit 1-1. Buffer Chamber 2. Desorption System 2-1. Buffer Chamber 3. Activated Carbon Chamber 4. First Bucket Conveyor 5. Second Bucket Conveyor 6. Belt Conveyor 11. Laser Rangefinder 12. Signal Acquisition Unit 13. Control Device Detailed Implementation

[0064] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0065] In this document, terms such as "upper," "lower," "inner," and "outer" are established based on the positional relationships shown in the accompanying drawings. Depending on the drawings, the corresponding positional relationships may also change. Therefore, they should not be interpreted as an absolute limitation on the scope of protection. Moreover, relational terms such as "first" and "second" are only used to distinguish one component from another that has the same name, and do not necessarily require or imply any such actual relationship or order between these components.

[0066] Please refer to Figure 1 , Figure 1 This is a partial structural schematic diagram of a flue gas purification system provided in an embodiment of the present invention.

[0067] In one specific embodiment, the activated carbon flue gas purification system provided by the present invention mainly consists of an adsorption system composed of multiple adsorption units 1 connected in parallel, a desorption system 2, an activated carbon bin 3, a first chain bucket conveyor 4, and a second chain bucket conveyor 5. The adsorption unit 1 is equipped with a roller feeder. During operation, the first chain bucket conveyor 4 transports the activated carbon discharged from the adsorption unit 1 to the buffer bin 2-1 of the desorption system 2. The desorbed activated carbon is then transported by the second chain bucket conveyor 5 to each buffer bin 1-1 of the adsorption unit 1.

[0068] During the adsorption and desorption process, some loss of activated carbon occurs. When the material level in the buffer chamber of the adsorption tower and the desorption tower is too low, it is replenished by clean activated carbon in the activated carbon chamber 3. After being weighed by the belt conveyor 6, it is transported to the first chain bucket machine 4 and then transported to the desorption tower of the desorption system 2.

[0069] Please refer to this as well. Figure 2 , Figure 2 This is a schematic diagram of the basic structure of a roller feeder discharge volume control device provided in an embodiment of the present invention.

[0070] In one specific embodiment, the roller feeder discharge control device provided by the present invention mainly consists of two parts:

[0071] The first part is a laser rangefinder 11, which is installed at the position after each roller feeder discharges material. It is used to scan the activated carbon loaded in the chain bucket of the chain bucket conveyor in real time. Specifically, a line laser rangefinder can be used.

[0072] The second part is the control device 13. The laser rangefinder 11 is connected to the control device 13 through the signal acquisition unit 12. The control device 13 is used to receive the signal from the laser rangefinder 11 and calculate the volume V of activated carbon loaded in the chain bucket. 料 According to the volume V of activated carbon loaded in the chain hopper 料 Given the density ρ, calculate the amount of activated carbon transported in the chain bucket of the chain conveyor after each roller feeder discharges; based on the amount of activated carbon transported in the chain bucket, calculate the actual discharge volume W of each roller feeder. i 辊 According to the actual discharge capacity W of the roller feeder i 辊 Based on the current operating parameters, calculate the actual discharge efficiency η of the roller feeder. 实际 ; and based on the obtained actual discharge efficiency η 实际 Adjust the variable parameters of the roller feeder to make the actual discharge rate reach the target discharge rate Q.i .

[0073] The activated carbon discharge control method provided by this invention uses laser ranging to calculate the volume V of activated carbon loaded in the chain bucket of the chain bucket conveyor after each roller feeder discharges. 料 Then, the amount of activated carbon transported in the chain bucket and the actual discharge volume W of the roller feeder can be calculated. i 辊 Next, based on the actual discharge volume W of the roller feeder i 辊 Based on the current operating parameters, calculate the actual discharge efficiency η of the roller feeder. 实际 Then, based on the obtained actual discharge efficiency η 实际 Adjust the variable parameters of the roller feeder to make the actual discharge rate reach the target discharge rate Q. i .

[0074] The specific calculation and control process is as follows:

[0075] A line laser rangefinder is installed above the hopper to acquire the contour height information of the activated carbon. The cross-section scanned by the rangefinder each time is as follows: Figure 3 , Figure 4 As shown.

[0076] Because the bottom surface of the hopper is curved, its scanning cross-section changes within the constructed coordinate system as the operation progresses. L represents the distance from the line laser rangefinder to the highest point of the hopper; this distance is fixed after the rangefinder is installed. The shaded area in the diagram represents the region where the hopper is loaded with material. Since the position of the hopper's bottom surface changes in the coordinate system at different times, this method first calculates the volume of the empty area of ​​the hopper. The material volume is equal to the total hopper volume minus the volume of the empty area.

[0077] When the distance measured by the line laser rangefinder is equal to L, it is the connection point between the two hoppers, indicating that the volume measurement of one hopper has ended or the measurement of the other hopper has begun.

[0078] Calculation of unloaded area volume:

[0079] After scanning the objects within a single hopper, they are divided into several simulated small cylinders. The height from the material surface to the edge of the hopper is:

[0080] H1=L1×COSα-L

[0081] The width selected on the x-axis is:

[0082] Δx=M=|L1×Sinα-L2×Sinβ|

[0083] The width selected along the running direction of the chain bucket conveyor can be determined based on the running speed v of the chain bucket conveyor and the interval t used:

[0084] Δz=vt

[0085] The volume of a single small cylinder is:

[0086] V1=H1×Δx×Δz=(L1×COSα-L)×|L1×Sinα-L2×Sinβ|×vt

[0087] The volume of the unloaded area of ​​the hopper is:

[0088] V 空 =∑(L i ×COSα i -L)×|L i ×Sinα-L i+1 ×Sinα i+1 |×vt

[0089] The volume of material loaded in the chain bucket is:

[0090] V 料 =V 固 -V 空 V 固 This refers to the volume of the hopper when it is full.

[0091] Let the bulk density of activated carbon be ρ, and the amount of activated carbon transported per unit time be: num represents the number of bucket chains that pass through within time t. The discharge capacity of the corresponding roller feeder can be obtained from the conveying capacity calculated by the bucket chain conveyor.

[0092] like Figure 5 As shown, the chain bucket conveyor 4 passes through each adsorption tower in sequence. Each adsorption tower has multiple chambers, and a laser rangefinder 11 is installed at the position after the roller feeder discharges material from each chamber.

[0093] Assuming position I is the first material receiving position, then the discharge capacity of its roller feeder is equal to the conveying capacity of the chain bucket conveyor calculated by the position detection device: W1 = W1 辊 Position II is the next compartment after the bucket chain conveyor passes position I. The conveying capacity of the bucket chain conveyor at this position is the sum of that at position I and position II. Therefore, the conveying capacity at position II is: W2 - W1 = W2 辊 And so on, to obtain the material feed rate of the roller feeder at each subsequent position.

[0094] The discharge capacity of a roller feeder is related to its discharge width, opening height, rotational speed, feeder diameter, activated carbon density, and discharge efficiency. The following formula can be used to estimate its discharge capacity:

[0095]

[0096] in, - Estimated feed rate of the roller feeder, t / h;

[0097] B i - Discharge width of roller feeder, m;

[0098] h i - Roller feeder opening height, m;

[0099] n i -Roller feeder speed, r / min;

[0100] D i - Roller feeder roller diameter, m;

[0101] η 出厂 The discharge efficiency of a roller feeder is generally between 0.7 and 0.9.

[0102] Due to installation errors, long-term use, and fluctuations in discharge efficiency, the discharge volume estimated directly using the estimation formula will differ from the actual discharge volume. Over time, this error will accumulate and increase, making it impossible to accurately control the activated carbon flow rate.

[0103] Based on the calculated actual discharge volume W of each roller feeder i 辊 Using the estimation formula, the actual discharge efficiency η of the roller feeder can be calculated in reverse. 实际 .

[0104]

[0105] If it is necessary to adjust the feed rate of the roller feeder, the obtained η 实际 The value is used to adjust the speed or other parameters of the roller feeder.

[0106] The specific adjustment process is as follows:

[0107] When it is necessary to adjust the discharge rate of the roller feeder, the actual discharge efficiency η of each roller feeder is obtained in real time. 实际 The target rotational speed n is obtained according to the following formula. i Q ;

[0108]

[0109] In the formula:

[0110] ΔQ i - The difference ΔQ that needs to be adjusted i =Q i -W i 辊;

[0111] Q i -Target discharge rate;

[0112] W i 辊 -Current material discharge rate in the storage compartment;

[0113] n i W - Current rotational speed;

[0114] n i Q - Target speed.

[0115] The above embodiments are merely preferred embodiments of the present invention and are not limited thereto. Based on these, targeted adjustments can be made according to actual needs to obtain different implementation methods. For example, the volume of activated carbon loaded in the chain bucket of the chain bucket conveyor after discharge from each roller feeder can be obtained through other calculation methods, etc. Since there are many possible implementation methods, they will not be listed here.

[0116] The method and device for controlling the discharge volume of this roller feeder uses laser ranging to detect and calculate the volume V of activated carbon transported in each chain bucket of the chain bucket machine. 料 The conveying flow rate of the chain bucket elevator is obtained based on the volume and activated carbon density ρ. After measuring the conveying volume of the chain bucket elevator after each roller feeder discharges, the actual discharge volume W of the roller feeder can be obtained. i 辊 Then, the actual discharge capacity W of the roller feeder is calculated based on this device. i 辊 Based on the formula for calculating the discharge capacity of roller feeders, the real-time discharge efficiency η of each roller feeder is obtained by reverse calculation. 实际 Using real-time discharge efficiency η 实际 The discharge efficiency η of the double roller feeder 出厂 The correction allows for more accurate measurement of the roller feeder's rotational speed n. i and opening height h i To control the discharge volume.

[0117] The foregoing has provided a detailed description of the roller feeder discharge control method, control device, and flue gas purification system provided by this invention. Specific examples have been used to illustrate the principles and implementation methods of this invention; the descriptions of these embodiments are merely for the purpose of helping to understand the core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A method for controlling the discharge amount of a roller feeder, comprising: The laser ranging device is used to scan the activated carbon loaded in the chain bucket of the chain bucket conveyor in real time, and the volume of the activated carbon loaded in the chain bucket is obtained through conversion ; According to the volume of activated carbon loaded in the chain bucket after the discharge of each roller feeder and the density p, the transport volume of activated carbon loaded in the chain bucket of the chain bucket conveyor after the discharge of each roller feeder is calculated; According to the active carbon transport capacity in the chain bucket, the actual discharge capacity of each roller feeder is calculated ; based on the actual discharge amount of the roll feeder and the current operating parameters, calculate the current actual discharge efficiency of the roll feeder ; based on the actual discharge efficiency obtained adjusting the variable parameters of the roller feeder to achieve the target discharge amount ; said volume of activated carbon loaded in the chain bucket according to the volume of activated carbon loaded in the chain bucket and the density p, the volume of activated carbon transported by the chain bucket conveyor after the discharge of each roller feeder, comprising: Let the density of the activated carbon be p, and the conveying capacity of the chain-and-bucket conveyor per unit time is calculated according to the formula , wherein num represents the number of chains and buckets passing through in t time. According to the calculated chain-and-bucket conveyor delivery capacity, the actual discharge capacity of the corresponding roller feeder is calculated ; The actual discharge capacity of the corresponding roller feeder is calculated according to the obtained chain bucket conveyor conveying capacity , comprising: For the first receiving material position, the actual discharge amount of the roller feeder is equal to the calculated bucket elevator delivery amount at this position: ; For the roll feeder of the second receiving material location, the actual discharge amount is , wherein W2 is the calculated chain-and-bucket conveyor conveying amount at the location; The actual discharge amount of the roller feeder at each subsequent receiving material position is obtained in the same way.

2. The roll feeder discharge capacity control method according to claim 1, characterized by, The laser ranging device is used to scan the activated carbon loaded in the chain bucket of the chain bucket conveyor in real time, and the volume of the activated carbon loaded in the chain bucket is obtained through conversion , comprising: After scanning the activated carbon in a single chain bucket, it is divided into several simulated small column bodies, and the height of the material surface to the edge of the bucket is: ； The width selected on the x-axis is: ； The width selected along the running direction of the chain bucket conveyor is determined according to the running speed v of the chain bucket conveyor and the interval t: ； The volume of a single small column body is: ； The volume of the empty area of the bucket is: ； The volume of the material loaded in the chain bucket is: wherein is the volume of the hopper when full.

3. The roll feeder discharge capacity control method according to claim 1 or 2, characterized by, The actual discharge amount of the roller feeder is calculated based on the current operating parameters of the roller feeder and the current operating parameters, to calculate the current actual discharge efficiency of the roller feeder The calculation formula is: ； In the formula: - roll feeder discharge width, in m; - roll feeder opening height, in m; - roll feeder rotation speed, in r / min; - roll feeder roll diameter in m; ρ - the density of activated carbon, in kg / m³.

4. The roll feeder discharge capacity control method according to claim 3, characterized by, According to the actual discharge efficiency obtained The variable parameters of the roller feeder are adjusted to make the actual discharge amount reach the target discharge amount , comprising: adjusting the variable parameters and calculating the deviation of the actual discharge amount from the target discharge amount again after each adjustment according to the actual discharge amount the deviation value is greater than the allowable range, then adjusting the variable parameters of the roller feeder again according to the deviation value until the deviation value is less than the allowable range.

5. The roll feeder discharge capacity control method according to claim 4, characterized by, The variable parameters of the roller feeder include rotating speed When it is necessary to adjust the discharging capacity of the roller feeder, the actual discharging efficiency of each roller feeder is obtained in real time The adjusted target rotating speed is obtained according to the following formula ; ； In the formula: - difference to be adjusted ; - target discharge amount; - current bin discharge volume; - is the current rotational speed; - target rotational speed.

6. A roll feeder discharge capacity control device characterized by, Comprising: A laser ranging device is installed at the position after the discharge of each roller feeder, which is used to scan the activated carbon loaded in the chain bucket of the chain bucket conveyor in real time; A control device is used to receive the signal of the laser ranging device, and the volume of the activated carbon loaded in the chain bucket is obtained through conversion ; according to the volume of the activated carbon loaded in the chain bucket and the density p, the activated carbon transportation volume loaded in the chain bucket of the chain bucket conveyor after the discharge of each roller feeder is calculated; according to the activated carbon transportation volume loaded in the chain bucket, the actual discharge volume of each roller feeder is calculated ; according to the actual discharge volume of the roller feeder and the current operating parameters, the current actual discharge efficiency of the roller feeder is calculated ; and based on the actual discharge efficiency obtained the variable parameters of the roller feeder are adjusted so that the actual discharge amount reaches the target discharge amount ; said volume of activated carbon loaded in the chain bucket according to the volume of activated carbon loaded in the chain bucket and the density p, the volume of activated carbon transported by the chain bucket conveyor after the discharge of each roller feeder, comprising: Let the density of the activated carbon be p, and the conveying capacity of the chain-and-bucket conveyor per unit time is calculated according to the formula , wherein num represents the number of chains and buckets passing through in t time. According to the calculated chain-and-bucket conveyor delivery capacity, the actual discharge capacity of the corresponding roller feeder is calculated ; said actual discharge amount of the corresponding roll feeder is calculated according to the obtained chain-and-bucket conveyor conveying amount , comprising: For the first receiving material position, the actual discharge amount of the roller feeder is equal to the calculated bucket elevator delivery amount at this position: ; For the roll feeder of the second receiving material location, the actual discharge amount is , wherein W2 is the calculated chain-and-bucket conveyor conveying amount at the location. The actual discharge amount of the roller feeder at each subsequent receiving material position is obtained in the same way.

7. A flue gas cleaning system comprising an adsorption system of a plurality of adsorption units connected in parallel, a desorption system, an activated carbon bin, and an en masse conveyor, the adsorption units being provided with a roller feeder, characterized in that, The actual discharge amount of the roller feeder is adjusted by using the roller feeder discharge amount control method of any one of claims 1 to 5, or the roller feeder discharge amount control device of claim 6 is provided.

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