Control method and system for multi-furnace centralized dynamic dust removal equipment

Abstract

The invention relates to the technical field of industrial flue gas treatment, and discloses a control method and system for multi-furnace centralized dynamic dust removal equipment. The control system comprises a main pipeline pressure sensor, a main pipeline temperature sensor, a negative pressure fan control unit, a water pump control unit, a discharge pipeline pressure sensor, a discharge pipeline temperature sensor, a discharge pipeline dust concentration detector, a warning device, a plurality of collection port dust concentration detectors and a plurality of turning plate control units. The control method comprises the steps of determining the opening degree of the turning plate based on the dust concentration of the collecting opening and the corresponding pipeline length, determining the fan flow based on the main pipeline pressure and determining the cooling water flow based on the main pipeline temperature. Through comprehensive regulation and control, the treatment capacity of multi-furnace centralized dust removal equipment can be brought into full play, a better flue gas treatment effect is obtained, meanwhile, the cloth bag loss is reduced, lower comprehensive energy consumption is obtained, and the overall operation cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of industrial flue gas treatment technology, and in particular to a control method and system for a multi-furnace centralized dynamic dust removal device. Background Technology

[0002] In industrial production processes, especially in the metal smelting industry, dust collection and treatment of furnace flue gas is a crucial environmental and safety issue. With increasingly stringent environmental regulations and rising public demands for environmental quality, effective dust collection and treatment of particulate matter in furnace flue gas has become paramount. Traditional dust collection systems are prone to filter bag burn-through when handling flue gas containing combustion particles, leading to equipment damage and excessive dust concentrations in exhaust gases.

[0003] In existing technologies, a stainless steel mesh is typically added before the filter bag to intercept larger combustion particles. However, when multiple furnaces are used for flue gas treatment simultaneously, the large flue gas flow rate, high fan energy consumption, and high flue gas velocity mean that combustion particles cannot burn completely in the flue gas duct, leading to an increase in the number of combustion particles and a larger average particle size. In this situation, when the mesh size of the stainless steel mesh is small, combustion particles easily clog the mesh, resulting in increased pressure loss and decreased filtration efficiency. When the mesh size is large, combustion particles can easily reach the filter bag before extinguishing, causing the filter bag to burn out. Furthermore, the increased flue gas velocity significantly increases filter bag wear due to friction as the flue gas passes through it, shortening the filter bag's service life.

[0004] To address the issue of combustion particles, Chinese utility model patent CN210198113U discloses a clean and efficient dust removal device for aluminum melting furnace flue gas. This device uses a spark catcher instead of a stainless steel mesh to remove sparks (i.e., combustion particles) from the flue gas. However, it does not solve the problem of large flue gas flow and further increases the structural complexity of the equipment, leading to higher maintenance costs. Some solutions use water mist to extinguish combustion particles, but in practical applications, problems such as agglomeration caused by moisture, decreased bag filter efficiency, and equipment corrosion are difficult to solve.

[0005] Therefore, developing a novel multi-furnace flue gas dust collection and treatment system and its control method is of great practical significance and application value for improving dust collection efficiency, reducing environmental pollution and ensuring equipment safety. Summary of the Invention

[0006] To address the aforementioned shortcomings, the present invention aims to propose a control method and system for a multi-furnace centralized dynamic dust removal device, thereby solving the problem of large flue gas flow affecting the service life of filter bags when multiple furnaces are simultaneously treated for flue gas dust collection.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] A control method for a multi-furnace centralized dynamic dust removal system is disclosed. The control method is applied to the control system of the multi-furnace centralized dust removal equipment. The control system is communicatively connected to a main pipeline pressure sensor, a main pipeline temperature sensor, a negative pressure fan control unit, a water pump control unit, an exhaust pipeline pressure sensor, an exhaust pipeline temperature sensor, an exhaust pipeline dust concentration detector, an alarm device, several collection port dust concentration detectors, and several flap control units. Each collection port dust concentration detector corresponds one-to-one with a specific collection port, and each collection port is equipped with a flap. Each flap control unit corresponds one-to-one with a specific flap. The control method includes:

[0009] The system obtains the pipe length L of all collection ports and the dust concentration C of each collection port at a preset time node. The pipe length L is the pipe length between the collection port and the negative pressure fan. The dust concentration C of the collection port is obtained by detecting the dust concentration of the collection port using a dust concentration detector. Based on the dust concentration C of the collection port and the corresponding pipe length L, the opening degree θ of the corresponding flap is determined. The opening degree θ of the flap is transmitted to the corresponding flap control unit, which adjusts the opening degree of the corresponding flap according to the opening degree θ.

[0010] The main pipeline pressure P at a preset time node is obtained. The main pipeline pressure P is obtained by the main pipeline pressure sensor to detect the pressure in the main pipeline. The fan flow rate Q is determined based on the main pipeline pressure P. The fan flow rate Q is transmitted to the negative pressure fan control unit. The negative pressure fan control unit adjusts the flow rate of the negative pressure fan according to the fan flow rate Q.

[0011] The main pipe temperature T at a preset time node is obtained. The main pipe temperature T is obtained by the main pipe temperature sensor to detect the temperature inside the main pipe. The cooling water flow rate M is determined based on the main pipe temperature T and transmitted to the water pump control unit. The water pump control unit adjusts the water pump flow rate according to the cooling water flow rate M.

[0012] The system acquires the emission pipeline pressure P', emission pipeline temperature T', and emission dust concentration C' at a preset time point. The emission pipeline pressure P' is obtained by detecting the pressure within the emission pipeline using the emission pipeline pressure sensor; the emission pipeline temperature T' is obtained by detecting the temperature within the emission pipeline using the emission pipeline temperature sensor; and the emission dust concentration C' is obtained by detecting the dust concentration within the emission pipeline using the aforementioned emission pipeline dust concentration detector. When the emission pipeline pressure P', emission pipeline temperature T', or emission dust concentration C' reaches a preset warning threshold, a warning command is generated and transmitted to the warning device. The warning device then issues a warning based on the warning command.

[0013] Preferably, the formula for calculating the flap opening θ is:

[0014] When C < 100 mg / m 3 When θ = 0;

[0015] When C≥100mg / m 3 hour,

[0016] Where n is an empirical constant, and the value of n ranges from 1 to 3, C MAX L represents the maximum dust concentration C among several collection ports where the current flap opening θ is greater than 0. MAX It represents the maximum value of the pipe length L among several collection ports where the current flap opening θ is greater than 0.

[0017] Preferably, the formula for calculating the fan flow rate Q is:

[0018]

[0019] Where k is an empirical constant, and the value of k ranges from 0.5 to 1; Q0 is the current flow rate of the negative pressure fan; and P0 is the preset pressure value in the main pipeline, in Pa.

[0020] Preferably, the formula for calculating the cooling water flow rate M is:

[0021] M = t × Q × (T - T0);

[0022] Where t is the temperature compensation coefficient, and the value of t ranges from 0.08 to 0.02 (°C). -1 M and Q have the same unit, and T0 is the preset flue gas emission temperature in °C.

[0023] Preferably, the warning threshold of the discharge pipeline pressure P′ is 1.5 times the current main pipeline pressure P. When P′ / P>1.5, the control system generates a warning command for excessive pipeline pressure difference and sends the warning command to the warning device.

[0024] Preferably, the warning threshold for the temperature T' of the discharge pipe is 140°C. When T' > 140°C, the control system generates a warning command for excessively high discharge temperature and sends the warning command to the warning device.

[0025] Preferably, the warning threshold for the emitted dust concentration C′ is 60 mg / m³. 3 When C'>60mg / m 3 When the dust level is too high, the control system generates a warning command and sends the warning command to the warning device.

[0026] A control system for a multi-furnace centralized dynamic dust removal device is provided for executing the aforementioned control method for the dust removal device. The control system is communicatively connected to a main pipeline pressure sensor, a main pipeline temperature sensor, a negative pressure fan control unit, a water pump control unit, an exhaust pipeline pressure sensor, an exhaust pipeline temperature sensor, an exhaust pipeline dust concentration detector, an alarm device, several collection port dust concentration detectors, and several flap control units. The system includes:

[0027] The module for calculating the opening degree is used to obtain the pipe length L of all collection ports and the dust concentration C of the collection port at a preset time node. The pipe length L is the pipe length between the collection port and the negative pressure fan. The dust concentration C of the collection port is obtained by detecting the dust concentration of the collection port through the dust concentration detector corresponding to the collection port. Based on the dust concentration C of the collection port and the corresponding pipe length L, the opening degree θ of the corresponding flap is determined and transmitted to the corresponding flap control unit. The flap control unit adjusts the opening degree of the corresponding flap according to the opening degree θ.

[0028] A fan flow calculation module is used to obtain the main pipeline pressure P at a preset time node. The main pipeline pressure P is obtained by the main pipeline pressure sensor to detect the pressure in the main pipeline. The flow rate Q is determined based on the main pipeline pressure P and transmitted to the negative pressure fan control unit. The negative pressure fan control unit adjusts the flow rate of the negative pressure fan according to the flow rate Q.

[0029] A water pump flow calculation module is used to obtain the main pipe temperature T at a preset time node. The main pipe temperature T is obtained by the main pipe temperature sensor to detect the temperature inside the main pipe. The cooling water flow rate M is determined based on the main pipe temperature T and transmitted to the water pump control unit. The water pump control unit adjusts the water pump flow rate according to the cooling water flow rate M.

[0030] The warning generation module is used to acquire the emission pipeline pressure P′, emission pipeline temperature T′, and emission dust concentration C′ at a preset time node. The emission pipeline pressure P′ is obtained by the emission pipeline pressure sensor to detect the pressure inside the emission pipeline. The emission pipeline temperature T′ is obtained by the emission pipeline temperature sensor to detect the temperature inside the emission pipeline. The emission dust concentration C′ is obtained by the emission pipeline dust concentration detector to detect the dust concentration inside the emission pipeline. When the emission pipeline pressure P′, emission pipeline temperature T′, or emission dust concentration C′ reaches a preset warning threshold, a warning command is generated and transmitted to the warning device. The warning device issues a warning based on the warning command.

[0031] Preferably, the opening calculation module includes:

[0032] The maximum pipe length determination submodule is used to obtain the pipe length L and the corresponding flap number for each collection port. This submodule also retrieves the opening degree of each flap and selects the flap numbers of flaps with opening degrees greater than 0 to obtain a flap number set. Based on the flap number set, it finds the pipe length L of the corresponding collection port to obtain a pipe length set. Finally, it selects the maximum pipe length from the pipe length set to obtain the pipe length L. MAX ;

[0033] The maximum dust concentration determination submodule is used to obtain the dust concentration C corresponding to each collection port to obtain a dust concentration set, and select the maximum dust concentration from the dust concentration set to obtain the pipe length C. MAX .

[0034] The technical solution provided by this invention may include the following beneficial effects:

[0035] The pipe length L corresponding to each collection port is determined manually by measuring the actual pipe length between the collection port and the negative pressure fan, and is pre-entered into the control system for storage. The preset time nodes are set manually according to actual needs; the higher the control precision required, the shorter the preset time node. If the preset time node is set to 2 minutes, the control system will collect data and dynamically adjust every 2 minutes. By monitoring the dust concentration C at the collection port, the flue gas emission status of the furnace is determined. When the dust concentration C at the collection port increases, the opening of the flapper is increased in time; when the dust concentration C at the collection port decreases, the opening of the flapper is decreased or the flapper is closed, reducing the flow rate in the main pipe. This prevents excessive heat from the smelting process from being carried away by the flue gas, thus avoiding increased fuel consumption.

[0036] By simultaneously monitoring the dust concentration C at multiple collection ports and calculating the opening degree θ of each flap, the opening degree of multiple flaps is dynamically adjusted. The opening size of the collection ports is adjusted by regulating the opening degree of the flaps, and the flow rate of each collection port is flexibly allocated. This enables the multi-furnace centralized dust removal system to achieve dynamic and on-demand control, solving the problems of large overall flue gas flow, high negative pressure fan energy consumption, and easy wear of filter bags when the flue gas of multiple furnaces is centrally treated, since the flue gas flow rate of each furnace cannot be adjusted individually.

[0037] It is worth noting that reducing the overall flue gas flow rate reduces the flue gas velocity in the main duct, slowing down the flue gas discharge and increasing the residence time of the flue gas and combustion particles in the main duct. This helps the combustion particles to burn completely, reduces the overall number and size of combustion particles, lowers the risk of the filter bag being burned by combustion particles, and makes full use of the flue gas duct's own cooling and heat dissipation capacity to reduce the flue gas temperature and reduce the energy consumption for subsequent flue gas cooling.

[0038] After the flue gas passes through the stainless steel mesh filter, the water pump control unit controls the pump to supply cooling water to the flue gas in the main pipeline for indirect heat exchange and cooling. This lowers the flue gas temperature, causing the burning particles to cool down and extinguish, preventing damage to the filter bags from the high-temperature flue gas and burning particles, and extending the service life of the filter bags. Based on the temperature in the main pipeline, the required cooling water consumption can be predicted, and the water pump flow rate can be adjusted in a timely manner to reduce water pump energy consumption and cooling water usage.

[0039] Monitoring the exhaust gas in the emission pipeline allows for timely understanding of the actual processing status of multi-furnace centralized dust removal equipment and provides key information on equipment problems, facilitating manual equipment maintenance.

[0040] By comprehensively controlling the process, the processing capacity of multi-furnace centralized dust collection equipment can be fully utilized, resulting in better flue gas treatment effects, reduced filter bag wear, and lower overall energy consumption, thus lowering overall operating costs. In one embodiment, under the same flue gas treatment capacity, the overall energy consumption for flue gas treatment is reduced by 30% through the above control method.

[0041] A small amount of dust is inevitably present in the production environment. When the furnace is not in use, the dust concentration at the corresponding collection port of the furnace is less than 100 mg / m³. 3 When the furnace was ignited, the dust concentration rapidly rose to over 100 mg / m³. 3 The dust concentration detector at the collection port detected a dust concentration C ≥ 100 mg / m³. 3 The control system of the multi-furnace centralized dust removal equipment controls the corresponding flap to open.

[0042] The pipe length L between each collection port and the negative pressure fan is different. Due to pressure loss along the pipe, the flap opening θ needs to be adjusted according to the corresponding pipe length L to adjust the actual flow distribution at the collection port. Here, n is manually determined based on the specific production situation. When n = 1, the adjustment relationship between the flap opening θ and the dust concentration C at the collection port is close to linear, the change in flap opening θ is relatively gentle, and the flow distribution is relatively uniform, suitable for conventional production conditions. When n > 1, the change in flap opening θ is exponential, and the compensation between several collection points based on different pipe lengths L is greater, suitable for special production scenarios with large flue gas volumes. However, it is necessary to consider avoiding the distribution of flue gas treatment for multiple furnaces as much as possible, to prevent multiple furnaces from simultaneously generating large amounts of flue gas, exceeding the actual equipment processing range, and losing the practical significance of flue gas flow control. When n < 1, the change in flap opening is a logarithmic function, which does not conform to the actual situation. When n > 3, the change in flap opening is too aggressive and cannot achieve an effective distribution effect. Therefore, the preferred value range for n is 1 to 3.

[0043] The flap opening θ is calculated based on the dust concentration C at the collection port and the pipe length L. This allows for precise adjustment of the flow distribution at different collection ports according to the actual flue gas emission requirements of multiple furnaces, solving the problem of inaccurate flow distribution in traditional flue gas control systems.

[0044] By adjusting the value of the empirical constant n, various production scenarios can be addressed, ensuring that the control system can flexibly adjust according to changes in production conditions. This not only adapts to routine production but also addresses special scenarios with large flue gas volumes, improving the control system's adjustment accuracy and flexibility, and resolving issues such as uneven flue gas flow distribution or over-adjustment.

[0045] While ensuring that the flue gas emission flow rate of each furnace is met, the overall flue gas flow rate is reduced, thereby improving the overall dust removal efficiency, avoiding resource waste, and extending the service life of the filter bags.

[0046] The Q-type negative pressure fan is mainly used to control the negative pressure in the main pipeline. Sufficient negative pressure in the main pipeline is essential for effective flue gas collection. When the main pipeline pressure P rises and deviates from the preset pressure value P0, it directly leads to insufficient negative pressure at the collection port. Flue gas in the furnace can easily escape through other openings, making effective collection impossible. By increasing the fan flow rate Q, the main pipeline pressure P is reduced, ensuring that the flue gas enters the main pipeline under negative pressure and is discharged from the negative pressure fan. When the main pipeline pressure P decreases, the control system reduces the fan flow rate Q and increases the main pipeline pressure P, thereby reducing the flue gas flow velocity in the main pipeline.

[0047] k is an empirical constant corresponding to the pressure deviation and is related to the performance of the negative pressure fan. It is used to convert the actual pressure deviation into flow compensation. It is determined manually based on the actual setup and operation of the negative pressure fan. When a centrifugal fan is used, the centrifugal fan has a strong pressure reduction capacity, and its flow-pressure relationship performance curve is relatively steep. The value of k ranges from 0.5 to 0.7. When an axial fan is used, the flow-pressure relationship performance curve of the axial fan is relatively flat. The value of k ranges from 0.7 to 1. When a centrifugal fan and an axial fan are used together, the value of k should be considered as a whole within the range of 0.5 to 1.

[0048] By comprehensively considering the changes in flue gas volume caused by temperature variations, the actual pressure deviation in the main pipeline, and the performance of the negative pressure fan, the fan flow rate Q is precisely adjusted so that the pressure P in the main pipeline is maintained near the preset pressure value P0, thereby improving the control stability of the control system and solving the problem that the pressure P in the main pipeline is difficult to precisely adjust and maintain stability.

[0049] In one embodiment, the negative pressure fan is a new centrifugal fan that is being maintained and replaced, and k = 0.5. At this time, the multi-furnace centralized dust removal equipment has a better dynamic negative pressure control effect.

[0050] The temperature difference between the MQT cooling water and the flue gas is relatively large. By adjusting the simple linear relationship, a good dynamic adjustment effect can be effectively obtained.

[0051] The cooling water flow rate M is calculated by measuring the difference between the main pipeline temperature T and the standard flue gas emission temperature T0. This allows for automatic adjustment of the cooling water flow rate based on changes in flue gas temperature, ensuring timely and effective cooling of the flue gas. Dynamically adjusting the cooling water flow rate helps optimize cooling efficiency, providing more cooling water at high temperatures and reducing it at low temperatures, thereby reducing energy consumption and avoiding excessive cooling waste.

[0052] t is the compensation coefficient of cooling water flow rate corresponding to flue gas temperature. It is related to the actual cooling efficiency and is determined manually based on the actual cooling efficiency. The higher the temperature of the cooling water, the lower the heat exchange efficiency, and the larger the value of t. The overall cooling water consumption trend can be predicted by the temperature compensation coefficient t and the fan flow rate Q.

[0053] By using the difference between the main pipeline temperature T and the preset flue gas emission temperature T0, and in conjunction with the flow rate and temperature compensation coefficient t of the negative pressure fan, the cooling water flow rate M can be precisely controlled through predictive calculation. This avoids the problem of excessive or insufficient cooling water, thereby improving the cooling efficiency and energy-saving effect of the equipment. At the same time, it ensures that small-diameter burning particles passing through the stainless steel mesh can be cooled and extinguished, effectively reducing the risk of the filter bag being burned by burning particles.

[0054] In one embodiment, the cooling water is circulated using an air-cooled cooling tower. When the ambient temperature is 30°C, the cooling water temperature is relatively high, and the heat exchange tubes have high heat exchange efficiency after maintenance. When t=0.15, the control system has a good dynamic regulation effect on flue gas cooling.

[0055] By monitoring the ratio of the discharge pipeline pressure P′ to the main pipeline pressure P, blockages in the bag filter or other abnormalities that may damage the equipment can be detected promptly. When the pressure difference exceeds the set warning threshold, the control system generates an excessive pipeline pressure difference warning command and sends it to the warning device. The warning device then issues an audible and visual alarm, and displays the message "Excessive Pipeline Pressure Difference" on its display panel, reminding operators to check the equipment. This ensures timely handling of abnormal situations and prevents equipment damage or performance degradation. It effectively avoids problems that may be missed during manual inspections, improves equipment operational safety, reduces downtime, and ensures continuous and efficient operation of the equipment.

[0056] In a specific embodiment, the bag filter unit is equipped with an automatic dust removal device, and several bags are cleaned in turn, allowing the bag filter system to be used continuously. When the mesh of the bag is deformed or clogged with dust during long-term use, and the filtration capacity cannot be effectively restored, the pressure loss caused by the bag filter unit increases, and the ratio of the discharge pipe pressure P′ to the main pipe pressure P becomes larger.

[0057] In one embodiment, the emission standard specifies that the flue gas emission temperature should not exceed 150°C. Under normal dynamic control, the flue gas temperature in the emission pipeline is maintained between 130°C and 140°C. When the emission pipeline temperature T' in the emission pipeline exceeds 140°C, the operator should consider whether the cooling water treatment capacity is close to the upper limit and needs to be maintained or adjusted in time to avoid the flue gas emission temperature from rising further and causing the flue gas temperature to exceed the standard.

[0058] By monitoring the temperature T′ of the exhaust pipe, the system ensures that the flue gas emission temperature remains within a reasonable range, preventing excessively high flue gas temperatures that could lead to emissions exceeding standards. When the temperature exceeds the set warning threshold, the control system generates a high emission temperature warning command and sends it to the warning device. The warning device then issues an audible and visual alarm, and its display panel shows the message "Exhaust Temperature Too High," promptly reminding operators to take measures to prevent excessively high flue gas temperatures caused by insufficient cooling water treatment capacity, ensuring emissions meet environmental protection requirements. This improves the predictability of equipment maintenance, enabling timely intervention when temperatures rise abnormally, ensuring flue gas emissions meet standards, and preventing environmental pollution.

[0059] Under normal operating conditions, the bag filter should be able to control the dust concentration to a very low level. If the dust concentration at the emission point exceeds 60 mg / m³... 3 This indicates that there is a problem with the use of some of the bags.

[0060] By monitoring the emission dust concentration C′ in real time, the dust concentration is ensured to remain within the normal range. When the concentration exceeds the set warning threshold, the control system generates a warning command for excessive dust and sends it to the warning device. The warning device issues an audible and visual alarm, and the display panel of the warning device displays the message "Emission dust concentration too high". The warning device prompts the operator to check the operating status of the filter bags or other components, detect filter bag damage, detachment or other abnormalities in advance, reduce the negative impact on equipment performance, avoid excessive dust emissions, and ensure environmental compliance in the production process.

[0061] The control system achieves efficient adjustment and management of various parts of the dust removal equipment through the coordinated operation of multiple modules, including the opening degree calculation module, the fan flow calculation module, the water pump flow calculation module, and the warning generation module.

[0062] The system can acquire equipment operating data in real time and automatically adjust various parameters, such as fan flow, flap opening and cooling water flow, thereby reducing energy consumption and optimizing equipment operating costs while ensuring dust removal effect.

[0063] The warning generation module can promptly detect equipment abnormalities and automatically trigger warnings, reducing the burden of manual inspections and improving equipment maintenance efficiency and lifespan.

[0064] By dynamically acquiring and optimizing the pipe length and dust concentration at each collection point, the maximum pipe length and maximum dust concentration can be accurately calculated, ensuring that the flow allocation at each collection point is always optimal. This optimized flow distribution mechanism not only improves dust removal efficiency but also effectively reduces the energy consumption of negative pressure fans and water pumps, resulting in higher operating efficiency and lower operating costs, while avoiding resource waste and equipment overload. Attached Figure Description

[0065] Figure 1 This is a schematic diagram of a control system according to an embodiment of the present invention. Detailed Implementation

[0066] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0067] In the description of this invention, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, features defined with "first" and "second" may explicitly or implicitly include one or more of these features, used to distinguish and describe features, without any order or emphasis.

[0068] In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0069] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0070] The embodiments of the present invention are described below with reference to the accompanying drawings.

[0071] A control method for a multi-furnace centralized dynamic dust removal system is disclosed. The control method is applied to the control system of the multi-furnace centralized dust removal equipment. The control system is communicatively connected to a main pipeline pressure sensor, a main pipeline temperature sensor, a negative pressure fan control unit, a water pump control unit, an exhaust pipeline pressure sensor, an exhaust pipeline temperature sensor, an exhaust pipeline dust concentration detector, an alarm device, several collection port dust concentration detectors, and several flap control units. Each collection port dust concentration detector corresponds one-to-one with a specific collection port, and each collection port is equipped with a flap. Each flap control unit corresponds one-to-one with a specific flap. The control method includes:

[0072] The system obtains the pipe length L of all collection ports and the dust concentration C of each collection port at a preset time node. The pipe length L is the pipe length between the collection port and the negative pressure fan. The dust concentration C of the collection port is obtained by detecting the dust concentration of the collection port using a dust concentration detector. Based on the dust concentration C of the collection port and the corresponding pipe length L, the opening degree θ of the corresponding flap is determined. The opening degree θ of the flap is transmitted to the corresponding flap control unit, which adjusts the opening degree of the corresponding flap according to the opening degree θ.

[0073] The main pipeline pressure P at a preset time node is obtained. The main pipeline pressure P is obtained by the main pipeline pressure sensor to detect the pressure in the main pipeline. The fan flow rate Q is determined based on the main pipeline pressure P. The fan flow rate Q is transmitted to the negative pressure fan control unit. The negative pressure fan control unit adjusts the flow rate of the negative pressure fan according to the fan flow rate Q.

[0074] The main pipe temperature T at a preset time node is obtained. The main pipe temperature T is obtained by the main pipe temperature sensor to detect the temperature inside the main pipe. The cooling water flow rate M is determined based on the main pipe temperature T and transmitted to the water pump control unit. The water pump control unit adjusts the water pump flow rate according to the cooling water flow rate M.

[0075] The system acquires the emission pipeline pressure P', emission pipeline temperature T', and emission dust concentration C' at a preset time point. The emission pipeline pressure P' is obtained by detecting the pressure within the emission pipeline using the emission pipeline pressure sensor; the emission pipeline temperature T' is obtained by detecting the temperature within the emission pipeline using the emission pipeline temperature sensor; and the emission dust concentration C' is obtained by detecting the dust concentration within the emission pipeline using the aforementioned emission pipeline dust concentration detector. When the emission pipeline pressure P', emission pipeline temperature T', or emission dust concentration C' reaches a preset warning threshold, a warning command is generated and transmitted to the warning device. The warning device then issues a warning based on the warning command.

[0076] The pipe length L corresponding to each collection port is determined manually by measuring the actual pipe length between the collection port and the negative pressure fan, and is pre-entered into the control system for storage. The preset time nodes are set manually according to actual needs; the higher the control precision required, the shorter the preset time node. If the preset time node is set to 2 minutes, the control system will collect data and dynamically adjust every 2 minutes. By monitoring the dust concentration C at the collection port, the flue gas emission status of the furnace is determined. When the dust concentration C at the collection port increases, the opening of the flapper is increased in time; when the dust concentration C at the collection port decreases, the opening of the flapper is decreased or the flapper is closed, reducing the flow rate in the main pipe. This prevents excessive heat from the smelting process from being carried away by the flue gas, thus avoiding increased fuel consumption.

[0077] By simultaneously monitoring the dust concentration C at multiple collection ports and calculating the opening degree θ of each flap, the opening degree of multiple flaps is dynamically adjusted. The opening size of the collection ports is adjusted by regulating the opening degree of the flaps, and the flow rate of each collection port is flexibly allocated. This enables the multi-furnace centralized dust removal system to achieve dynamic and on-demand control, solving the problems of large overall flue gas flow, high negative pressure fan energy consumption, and easy wear of filter bags when the flue gas of multiple furnaces is centrally treated, since the flue gas flow rate of each furnace cannot be adjusted individually.

[0078] It is worth noting that reducing the overall flue gas flow rate reduces the flue gas velocity in the main duct, slowing down the flue gas discharge and increasing the residence time of the flue gas and combustion particles in the main duct. This helps the combustion particles to burn completely, reduces the overall number and size of combustion particles, lowers the risk of the filter bag being burned by combustion particles, and makes full use of the flue gas duct's own cooling and heat dissipation capacity to reduce the flue gas temperature and reduce the energy consumption for subsequent flue gas cooling.

[0079] After the flue gas passes through the stainless steel mesh filter, the water pump control unit controls the pump to supply cooling water to the flue gas in the main pipeline for indirect heat exchange and cooling. This lowers the flue gas temperature, causing the burning particles to cool down and extinguish, preventing damage to the filter bags from the high-temperature flue gas and burning particles, and extending the service life of the filter bags. Based on the temperature in the main pipeline, the required cooling water consumption can be predicted, and the water pump flow rate can be adjusted in a timely manner to reduce water pump energy consumption and cooling water usage.

[0080] Monitoring the exhaust gas in the emission pipeline allows for timely understanding of the actual processing status of multi-furnace centralized dust removal equipment and provides key information on equipment problems, facilitating manual equipment maintenance.

[0081] By comprehensively controlling the process, the processing capacity of multi-furnace centralized dust collection equipment can be fully utilized, resulting in better flue gas treatment effects, reduced filter bag wear, and lower overall energy consumption, thus lowering overall operating costs. In one embodiment, under the same flue gas treatment capacity, the overall energy consumption for flue gas treatment is reduced by 30% through the above control method.

[0082] Preferably, the formula for calculating the flap opening θ is:

[0083] When C < 100 mg / m 3 When θ = 0;

[0084] When C≥100mg / m 3 hour,

[0085] Where n is an empirical constant, and the value of n ranges from 1 to 3, C MAX L represents the maximum dust concentration C among several collection ports where the current flap opening θ is greater than 0. MAX It represents the maximum value of the pipe length L among several collection ports where the current flap opening θ is greater than 0.

[0086] A small amount of dust is inevitable in the production environment. When the furnace is not in use, the dust concentration at the corresponding collection port of the furnace is less than 100 mg / m³. 3 When the furnace was ignited, the dust concentration rapidly rose to over 100 mg / m³. 3The dust concentration detector at the collection port detected a dust concentration C ≥ 100 mg / m³. 3 The control system of the multi-furnace centralized dust removal equipment controls the corresponding flap to open.

[0087] The pipe length L between each collection port and the negative pressure fan is different. Due to pressure loss along the pipe, the flap opening θ needs to be adjusted according to the corresponding pipe length L to adjust the actual flow distribution at the collection port. Here, n is manually determined based on the specific production situation. When n = 1, the adjustment relationship between the flap opening θ and the dust concentration C at the collection port is close to linear, the change in flap opening θ is relatively gentle, and the flow distribution is relatively uniform, suitable for conventional production conditions. When n > 1, the change in flap opening θ is exponential, and the compensation between several collection points based on different pipe lengths L is greater, suitable for special production scenarios with large flue gas volumes. However, it is necessary to consider avoiding the distribution of flue gas treatment for multiple furnaces as much as possible, to prevent multiple furnaces from simultaneously generating large amounts of flue gas, exceeding the actual equipment processing range, and losing the practical significance of flue gas flow control. When n < 1, the change in flap opening is a logarithmic function, which does not conform to the actual situation. When n > 3, the change in flap opening is too aggressive and cannot achieve an effective distribution effect. Therefore, the preferred value range for n is 1 to 3.

[0088] The flap opening θ is calculated based on the dust concentration C at the collection port and the pipe length L. This allows for precise adjustment of the flow distribution at different collection ports according to the actual flue gas emission requirements of multiple furnaces, solving the problem of inaccurate flow distribution in traditional flue gas control systems.

[0089] By adjusting the value of the empirical constant n, various production scenarios can be addressed, ensuring that the control system can flexibly adjust according to changes in production conditions. This not only adapts to routine production but also addresses special scenarios with large flue gas volumes, improving the control system's adjustment accuracy and flexibility, and resolving issues such as uneven flue gas flow distribution or over-adjustment.

[0090] While ensuring that the flue gas emission flow rate of each furnace is met, the overall flue gas flow rate is reduced, thereby improving the overall dust removal efficiency, avoiding resource waste, and extending the service life of the filter bags.

[0091] Preferably, the formula for calculating the fan flow rate Q is:

[0092]

[0093] Where k is an empirical constant, and the value of k ranges from 0.5 to 1; Q0 is the current flow rate of the negative pressure fan; and P0 is the preset pressure value in the main pipeline, in Pa.

[0094] Negative pressure fans are primarily used to control the negative pressure within the main duct. Sufficient negative pressure in the main duct is essential for effective flue gas collection. When the main duct pressure P deviates from the preset pressure value P0, insufficient negative pressure at the collection port directly leads to flue gas escaping from other openings in the furnace, hindering effective collection. Increasing the fan flow rate Q reduces the main duct pressure P, ensuring that flue gas enters the main duct under negative pressure and exits through the negative pressure fan. When the main duct pressure P decreases, the control system reduces the fan flow rate Q and increases the main duct pressure P, thereby reducing the flue gas velocity within the main duct.

[0095] k is an empirical constant corresponding to the pressure deviation and is related to the performance of the negative pressure fan. It is used to convert the actual pressure deviation into flow compensation. It is determined manually based on the actual setup and operation of the negative pressure fan. When a centrifugal fan is used, the centrifugal fan has a strong pressure reduction capacity, and its flow-pressure relationship performance curve is relatively steep. The value of k ranges from 0.5 to 0.7. When an axial fan is used, the flow-pressure relationship performance curve of the axial fan is relatively flat. The value of k ranges from 0.7 to 1. When a centrifugal fan and an axial fan are used together, the value of k should be considered as a whole within the range of 0.5 to 1.

[0096] By comprehensively considering the changes in flue gas volume caused by temperature variations, the actual pressure deviation in the main pipeline, and the performance of the negative pressure fan, the fan flow rate Q is precisely adjusted so that the pressure P in the main pipeline is maintained near the preset pressure value P0, thereby improving the control stability of the control system and solving the problem that the pressure P in the main pipeline is difficult to precisely adjust and maintain stability.

[0097] In one embodiment, the negative pressure fan is a new centrifugal fan that is being maintained and replaced, and k = 0.5. In this case, the multi-furnace centralized dust removal equipment has a better dynamic negative pressure control effect.

[0098] Preferably, the formula for calculating the cooling water flow rate M is:

[0099] M = t × Q × (T - T0);

[0100] Where t is the temperature compensation coefficient, and the value of t ranges from 0.08 to 0.02 (°C). -1 M and Q have the same unit, and T0 is the preset flue gas emission temperature in °C.

[0101] The temperature difference between the cooling water and the flue gas is relatively large. By adjusting the simple linear relationship, a good dynamic adjustment effect can be effectively obtained.

[0102] The cooling water flow rate M is calculated by measuring the difference between the main pipeline temperature T and the standard flue gas emission temperature T0. This allows for automatic adjustment of the cooling water flow rate based on changes in flue gas temperature, ensuring timely and effective cooling of the flue gas. Dynamically adjusting the cooling water flow rate helps optimize cooling efficiency, providing more cooling water at high temperatures and reducing it at low temperatures, thereby reducing energy consumption and avoiding excessive cooling waste.

[0103] t is the compensation coefficient of cooling water flow rate corresponding to flue gas temperature. It is related to the actual cooling efficiency and is determined manually based on the actual cooling efficiency. The higher the temperature of the cooling water, the lower the heat exchange efficiency, and the larger the value of t. The overall cooling water consumption trend can be predicted by the temperature compensation coefficient t and the fan flow rate Q.

[0104] By using the difference between the main pipeline temperature T and the preset flue gas emission temperature T0, and in conjunction with the flow rate and temperature compensation coefficient t of the negative pressure fan, the cooling water flow rate M can be precisely controlled through predictive calculation. This avoids the problem of excessive or insufficient cooling water, thereby improving the cooling efficiency and energy-saving effect of the equipment. At the same time, it ensures that small-diameter burning particles passing through the stainless steel mesh can be cooled and extinguished, effectively reducing the risk of the filter bag being burned by burning particles.

[0105] In one embodiment, the cooling water is circulated using an air-cooled cooling tower. When the ambient temperature is 30°C, the cooling water temperature is relatively high, and the heat exchange tubes have high heat exchange efficiency after maintenance. When t=0.15, the control system has a good dynamic regulation effect on flue gas cooling.

[0106] Preferably, the warning threshold of the discharge pipeline pressure P′ is 1.5 times the current main pipeline pressure P. When P′ / P>1.5, the control system generates a warning command for excessive pipeline pressure difference and sends the warning command to the warning device.

[0107] By monitoring the ratio of the discharge pipeline pressure P′ to the main pipeline pressure P, blockages in the bag filter or other abnormalities that may damage the equipment can be detected promptly. When the pressure difference exceeds the set warning threshold, the control system generates an excessive pipeline pressure difference warning command and sends it to the warning device. The warning device then issues an audible and visual alarm, and displays the message "Excessive Pipeline Pressure Difference" on its display panel, reminding operators to check the equipment. This ensures timely handling of abnormal situations and prevents equipment damage or performance degradation. It effectively avoids problems that may be missed during manual inspections, improves equipment operational safety, reduces downtime, and ensures continuous and efficient operation of the equipment.

[0108] In a specific embodiment, the bag filter unit is equipped with an automatic dust removal device, and several bags are cleaned in turn, allowing the bag filter system to be used continuously. When the mesh of the bag is deformed or clogged with dust during long-term use, and the filtration capacity cannot be effectively restored, the pressure loss caused by the bag filter unit increases, and the ratio of the discharge pipe pressure P′ to the main pipe pressure P becomes larger.

[0109] Preferably, the warning threshold for the temperature T′ of the discharge pipe is 140°C. When T′>140°C, the control system generates a warning command for excessively high discharge temperature and sends the warning command to the warning device.

[0110] In one embodiment, the emission standard specifies that the flue gas emission temperature should not exceed 150°C. Under normal dynamic control, the flue gas temperature in the emission pipeline is maintained between 130°C and 140°C. When the emission pipeline temperature T' in the emission pipeline exceeds 140°C, the operator should consider whether the cooling water treatment capacity is close to the upper limit and needs to be maintained or adjusted in time to avoid the flue gas emission temperature from rising further and causing the flue gas temperature to exceed the standard.

[0111] By monitoring the temperature T′ of the exhaust pipe, the system ensures that the flue gas emission temperature remains within a reasonable range, preventing excessively high flue gas temperatures that could lead to emissions exceeding standards. When the temperature exceeds the set warning threshold, the control system generates a high emission temperature warning command and sends it to the warning device. The warning device then issues an audible and visual alarm, and its display panel shows the message "Exhaust Temperature Too High," promptly reminding operators to take measures to prevent excessively high flue gas temperatures caused by insufficient cooling water treatment capacity, ensuring emissions meet environmental protection requirements. This improves the predictability of equipment maintenance, enabling timely intervention when temperatures rise abnormally, ensuring flue gas emissions meet standards, and preventing environmental pollution.

[0112] Preferably, the warning threshold for the emitted dust concentration C′ is 60 mg / m³. 3 When C'>60mg / m 3 When the dust level is too high, the control system generates a warning command and sends the warning command to the warning device.

[0113] Under normal operating conditions, the bag filter should be able to control the dust concentration to a very low level. If the dust concentration at the emission point exceeds 60 mg / m³... 3 This indicates that there is a problem with the use of some of the bags.

[0114] By monitoring the emission dust concentration C′ in real time, the dust concentration is ensured to remain within the normal range. When the concentration exceeds the set warning threshold, the control system generates a warning command for excessive dust and sends it to the warning device. The warning device issues an audible and visual alarm, and the display panel of the warning device displays the message "Emission dust concentration too high". The warning device prompts the operator to check the operating status of the filter bags or other components, detect filter bag damage, detachment or other abnormalities in advance, reduce the negative impact on equipment performance, avoid excessive dust emissions, and ensure environmental compliance in the production process.

[0115] A control system for a multi-furnace centralized dynamic dust removal device is provided for executing the aforementioned control method for the dust removal device. The control system is communicatively connected to a main pipeline pressure sensor, a main pipeline temperature sensor, a negative pressure fan control unit, a water pump control unit, an exhaust pipeline pressure sensor, an exhaust pipeline temperature sensor, an exhaust pipeline dust concentration detector, an alarm device, several collection port dust concentration detectors, and several flap control units. The system includes:

[0116] The module for calculating the opening degree is used to obtain the pipe length L of all collection ports and the dust concentration C of the collection port at a preset time node. The pipe length L is the pipe length between the collection port and the negative pressure fan. The dust concentration C of the collection port is obtained by detecting the dust concentration of the collection port through the dust concentration detector corresponding to the collection port. Based on the dust concentration C of the collection port and the corresponding pipe length L, the opening degree θ of the corresponding flap is determined and transmitted to the corresponding flap control unit. The flap control unit adjusts the opening degree of the corresponding flap according to the opening degree θ.

[0117] A fan flow calculation module is used to obtain the main pipeline pressure P at a preset time node. The main pipeline pressure P is obtained by the main pipeline pressure sensor to detect the pressure in the main pipeline. Based on the main pipeline pressure P, the flow rate Q is determined and transmitted to the negative pressure fan control unit. The negative pressure fan control unit adjusts the flow rate of the negative pressure fan according to the flow rate Q.

[0118] A water pump flow calculation module is used to obtain the main pipe temperature T at a preset time node. The main pipe temperature T is obtained by the main pipe temperature sensor to detect the temperature inside the main pipe. The cooling water flow rate M is determined based on the main pipe temperature T and transmitted to the water pump control unit. The water pump control unit adjusts the water pump flow rate according to the cooling water flow rate M.

[0119] The warning generation module is used to acquire the emission pipeline pressure P′, emission pipeline temperature T′, and emission dust concentration C′ at a preset time node. The emission pipeline pressure P′ is obtained by the emission pipeline pressure sensor to detect the pressure inside the emission pipeline. The emission pipeline temperature T′ is obtained by the emission pipeline temperature sensor to detect the temperature inside the emission pipeline. The emission dust concentration C′ is obtained by the emission pipeline dust concentration detector to detect the dust concentration inside the emission pipeline. When the emission pipeline pressure P′, emission pipeline temperature T′, or emission dust concentration C′ reaches a preset warning threshold, a warning command is generated and transmitted to the warning device. The warning device issues a warning based on the warning command.

[0120] The control system achieves efficient adjustment and management of various parts of the dust removal equipment through the coordinated operation of multiple modules, including the opening degree calculation module, the fan flow calculation module, the water pump flow calculation module, and the warning generation module.

[0121] The system can acquire equipment operating data in real time and automatically adjust various parameters, such as fan flow, flap opening and cooling water flow, thereby reducing energy consumption and optimizing equipment operating costs while ensuring dust removal effect.

[0122] The warning generation module can promptly detect equipment abnormalities and automatically trigger warnings, reducing the burden of manual inspections and improving equipment maintenance efficiency and lifespan.

[0123] Preferably, the opening calculation module includes:

[0124] The maximum pipe length determination submodule is used to obtain the pipe length L and the corresponding flap number for each collection port. This submodule also retrieves the opening degree of each flap and selects the flap numbers of flaps with opening degrees greater than 0 to obtain a flap number set. Based on the flap number set, it finds the pipe length L of the corresponding collection port to obtain a pipe length set. Finally, it selects the maximum pipe length from the pipe length set to obtain the pipe length L. MAX ;

[0125] The maximum dust concentration determination submodule is used to obtain the dust concentration C corresponding to each collection port to obtain a dust concentration set, and select the maximum dust concentration from the dust concentration set to obtain the pipe length C. MAX .

[0126] By dynamically acquiring and optimizing the pipe length and dust concentration at each collection point, the maximum pipe length and maximum dust concentration can be accurately calculated, ensuring that the flow allocation at each collection point is always optimal. This optimized flow distribution mechanism not only improves dust removal efficiency but also effectively reduces the energy consumption of negative pressure fans and water pumps, resulting in higher operating efficiency and lower operating costs, while avoiding resource waste and equipment overload.

[0127] Other configurations and operations according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0128] In the description of this specification, references to terms such as "embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0129] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A control method for a multi-furnace centralized dynamic dust removal system, characterized in that, The control method is applied to the control system of a multi-furnace centralized dust removal equipment. The control system is communicatively connected to a main pipeline pressure sensor, a main pipeline temperature sensor, a negative pressure fan control unit, a water pump control unit, an exhaust pipeline pressure sensor, an exhaust pipeline temperature sensor, an exhaust pipeline dust concentration detector, a warning device, several collection port dust concentration detectors, and several flap control units. Each collection port dust concentration detector corresponds one-to-one with a specific collection port, and each collection port is equipped with a flap. Each flap control unit corresponds one-to-one with a specific flap. The control method includes: The system obtains the pipe length L of all collection ports and the dust concentration C of each collection port at a preset time node. The pipe length L is the pipe length between the collection port and the negative pressure fan. The dust concentration C of the collection port is obtained by detecting the dust concentration of the collection port using a dust concentration detector. Based on the dust concentration C of the collection port and the corresponding pipe length L, the opening degree θ of the corresponding flap is determined. The opening degree θ of the flap is transmitted to the corresponding flap control unit, which adjusts the opening degree of the corresponding flap according to the opening degree θ. The main pipeline pressure P at a preset time node is obtained. The main pipeline pressure P is obtained by the main pipeline pressure sensor to detect the pressure in the main pipeline. The fan flow rate Q is determined based on the main pipeline pressure P. The fan flow rate Q is transmitted to the negative pressure fan control unit. The negative pressure fan control unit adjusts the flow rate of the negative pressure fan according to the fan flow rate Q. The main pipe temperature T at a preset time node is obtained. The main pipe temperature T is obtained by the main pipe temperature sensor to detect the temperature inside the main pipe. The cooling water flow rate M is determined based on the main pipe temperature T and transmitted to the water pump control unit. The water pump control unit adjusts the water pump flow rate according to the cooling water flow rate M. The system acquires the emission pipeline pressure P', emission pipeline temperature T', and emission dust concentration C' at a preset time point. The emission pipeline pressure P' is obtained by detecting the pressure within the emission pipeline using the emission pipeline pressure sensor. The emission pipeline temperature T' is obtained by detecting the temperature within the emission pipeline using the emission pipeline temperature sensor. The emission dust concentration C' is obtained by detecting the dust concentration within the emission pipeline using the aforementioned emission pipeline dust concentration detector. When the emission pipeline pressure P', emission pipeline temperature T', or emission dust concentration C' reaches a preset warning threshold, a warning command is generated and transmitted to the warning device. The warning device then issues a warning based on the warning command.

2. The control method for a multi-furnace centralized dynamic dust removal system according to claim 1, characterized in that, The formula for calculating the flap opening angle θ is: When C < 100 mg / m³, θ = 0; When C≥100mg / m3 Where n is an empirical constant, and the value of n ranges from 1 to 3, C MAX L represents the maximum dust concentration C among several collection ports where the current flap opening θ is greater than 0. MAX It represents the maximum value of the pipe length L among several collection ports where the current flap opening θ is greater than 0.

3. The control method for a multi-furnace centralized dynamic dust removal system according to claim 1, characterized in that, The formula for calculating the fan flow rate Q is: Where k is an empirical constant, and the value of k ranges from 0.5 to 1; Q0 is the current flow rate of the negative pressure fan; and P0 is the preset pressure value in the main pipeline, in Pa.

4. The control method for a multi-furnace centralized dynamic dust removal system according to claim 1, characterized in that, The formula for calculating the cooling water flow rate M is: M = t × Q × (T - T0); Where t is the temperature compensation coefficient, and the value of t ranges from 0.08 to 0.02 (°C). -1 M and Q have the same unit, and T0 is the preset flue gas emission temperature in °C.

5. The control method for a multi-furnace centralized dynamic dust removal system according to claim 1, characterized in that: The warning threshold for the discharge pipeline pressure P' is 1.5 times the current main pipeline pressure P. When P' / P>1.5, the control system generates a warning command for excessive pipeline pressure difference and sends the warning command to the warning device.

6. The control method for a multi-furnace centralized dynamic dust removal system according to claim 1, characterized in that: The warning threshold for the temperature T' of the discharge pipe is 140°C. When T' > 140°C, the control system generates a warning command for excessively high discharge temperature and sends the warning command to the warning device.

7. The control method for a multi-furnace centralized dynamic dust removal system according to claim 1, characterized in that: The warning threshold for the emission dust concentration C' is 60 mg / m3. When C' > 60 mg / m3, the control system generates a warning command for excessive dust and sends the warning command to the warning device.

8. A control system for a multi-furnace centralized dynamic dust removal device, characterized in that, A control method for executing the dust removal equipment according to any one of claims 1-7, wherein the control system is communicatively connected to a main pipeline pressure sensor, a main pipeline temperature sensor, a negative pressure fan control unit, a water pump control unit, an exhaust pipeline pressure sensor, an exhaust pipeline temperature sensor, an exhaust pipeline dust concentration detector, a warning device, a plurality of collection port dust concentration detectors, and a plurality of flap control units, comprising: The module for calculating the opening degree is used to obtain the pipe length L of all collection ports and the dust concentration C of the collection port at a preset time node. The pipe length L is the pipe length between the collection port and the negative pressure fan. The dust concentration C of the collection port is obtained by detecting the dust concentration of the collection port through the dust concentration detector corresponding to the collection port. Based on the dust concentration C of the collection port and the corresponding pipe length L, the opening degree θ of the corresponding flap is determined and transmitted to the corresponding flap control unit. The flap control unit adjusts the opening degree of the corresponding flap according to the opening degree θ. A fan flow calculation module is used to obtain the main pipeline pressure P at a preset time node. The main pipeline pressure P is obtained by the main pipeline pressure sensor to detect the pressure in the main pipeline. Based on the main pipeline pressure P, the flow rate Q is determined and transmitted to the negative pressure fan control unit. The negative pressure fan control unit adjusts the flow rate of the negative pressure fan according to the flow rate Q. A water pump flow calculation module is used to obtain the main pipe temperature T at a preset time node. The main pipe temperature T is obtained by the main pipe temperature sensor to detect the temperature inside the main pipe. The cooling water flow rate M is determined based on the main pipe temperature T and transmitted to the water pump control unit. The water pump control unit adjusts the water pump flow rate according to the cooling water flow rate M. The warning generation module is used to acquire the emission pipeline pressure P', emission pipeline temperature T', and emission dust concentration C' at a preset time node. The emission pipeline pressure P' is obtained by the emission pipeline pressure sensor to detect the pressure inside the emission pipeline, the emission pipeline temperature T' is obtained by the emission pipeline temperature sensor to detect the temperature inside the emission pipeline, and the emission dust concentration C' is obtained by the emission pipeline dust concentration detector to detect the dust concentration inside the emission pipeline. When the emission pipeline pressure P', emission pipeline temperature T', or emission dust concentration C' reaches a preset warning threshold, a warning command is generated and transmitted to the warning device, which then issues a warning based on the warning command.

9. The control system for a multi-furnace centralized dynamic dust removal device according to claim 8, characterized in that, The opening degree calculation module includes: The maximum pipe length determination submodule is used to obtain the pipe length L and the corresponding flap number for each collection port. This submodule also retrieves the opening degree of each flap and selects the flap numbers of flaps with opening degrees greater than 0 to obtain a flap number set. Based on the flap number set, it finds the pipe length L of the corresponding collection port to obtain a pipe length set. Finally, it selects the maximum pipe length from the pipe length set to obtain the pipe length L. MAX ; The maximum dust concentration determination submodule is used to obtain the dust concentration C corresponding to each collection port to obtain a dust concentration set, and select the maximum dust concentration from the dust concentration set to obtain the pipe length C. MAX .

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