Urea spray gun system and control method thereof

Abstract

The invention relates to the technical field of flue denitration, in particular to a urea spray gun system and a control method thereof. Comprising a central control unit used for setting a plurality of equipment points and a plurality of monitoring points according to flue parameters; the spray gun unit is used for spraying urea to flue gas in the flue; the atomization unit is used for generating atomization air; the monitoring unit is used for collecting flue gas parameters in the flue; the central control unit is further used for setting working parameters of the spray gun unit and the atomization unit according to the flue gas parameters collected by the monitoring unit. By additionally arranging the spraying unit, when the urea spray gun works, atomized air is generated to cover the periphery of the urea spray gun, the urea spray gun is prevented from being abraded by flue gas, meanwhile, solid particles in the flue gas are prevented from entering the urea spray gun to cause blockage, the atomized air is at normal temperature and can effectively cool the spray gun, and therefore the spray gun is prevented from being damaged by high temperature; and meanwhile, the sprayed urea can be further atomized by the atomizing air, so that the overall denitration efficiency in the flue is improved.

Description

Technical Field

[0001] The present application relates to the technical field of flue denitrification, and in particular to a urea spray gun system and a control method thereof. Background Art

[0002] The spray gun is the core of the SNCR denitrification system. The stability of the spray gun performance is the key to ensure that the denitrification agent aqueous solution is fully mixed with the flue gas. A good atomization effect can atomize the denitrification agent solution into small droplets to facilitate the reaction and save the amount of denitrification agent.

[0003] However, during the operation of the current spray gun, when the airflow in the furnace is disturbed, the flue gas carries particles that directly wash the nozzle, causing wear on the spray gun. At the same time, when the traditional spray gun starts or stops spraying, there is a risk of the reductant droplets directly dripping onto the water-cooled wall surface, causing water-cooled wall corrosion. And the internal part is prone to blockage, affecting the denitrification efficiency Summary of the invention

[0004] The purpose of this application is: to solve the above technical problems, this application provides a urea spray gun system and a control method thereof, aiming to reduce the failure risk of the urea spray gun and improve the denitrification efficiency.

[0005] In some embodiments of the present application, by adding a spray unit, when the urea spray gun is working, atomized wind is generated to cover the area around the urea spray gun, so as to prevent the urea spray gun from being worn by the flue gas, and at the same time prevent solid particles in the flue gas from entering the urea spray gun and causing blockage. The atomized wind is at room temperature and can effectively cool the spray gun, thereby avoiding high temperature damage to the spray gun and reducing the risk of failure of the urea spray gun. At the same time, the atomized wind can further atomize the sprayed urea, improve the reaction efficiency of urea and flue gas, thereby improving the overall denitrification efficiency in the flue.

[0006] In some embodiments of the present application, multiple monitoring points are set inside the flue according to the direction of flue gas flow, and the flue gas in the flue is comprehensively monitored. The urea spray guns at different positions are dynamically adjusted according to the monitoring data to ensure the denitrification quality inside the flue while reducing the urea spraying amount, thereby reducing the overall operation and maintenance costs.

[0007] In some embodiments of the present application, a urea spray gun system is provided, comprising:

[0008] The central control unit is used to set multiple equipment points and multiple monitoring points according to the flue parameters;

[0009] A spray gun unit, comprising a plurality of urea spray guns, wherein the urea spray guns are arranged at equipment points;

[0010] The spray gun unit is used to spray urea into the flue gas;

[0011] An atomization unit, comprising a plurality of atomization submodules, wherein the atomization submodules are arranged at the equipment point;

[0012] The atomizing unit is used to generate atomizing wind;

[0013] A monitoring unit, comprising a plurality of monitoring submodules, wherein the monitoring submodules are arranged at monitoring points;

[0014] The monitoring unit is used to collect flue gas parameters in the flue;

[0015] The central control unit is also used to set the working parameters of the spray gun unit and the atomization unit according to the smoke parameters collected by the monitoring unit.

[0016] In some embodiments of the present application, the central control unit includes:

[0017] The first processing module is used to set a monitoring point sequence A, A = (a1, a2 ... ai ... an), where a1 is the initial monitoring point, ai is the i-th monitoring point through which the flue gas flows; n is the number of monitoring points;

[0018] The first processing module is also used to establish a correlation model between various monitoring points according to the smoke flow parameters;

[0019] The second processing module is used to establish a urea spray gun sequence B, B = (b1, b2...bi...bm), wherein bi is the i-th urea spray gun; m is the number of urea spray guns;

[0020] The second processing module is also used to establish a monitoring point-urea spray gun mapping table;

[0021] The third processing module is used to set the working parameters of the spray gun unit and the atomization unit according to the smoke parameters at the initial monitoring point a1;

[0022] The fourth processing module is used to obtain the flue gas parameters of each monitoring point according to the preset feedback time node, and determine whether to generate a correction instruction;

[0023] The first maintenance module is used to obtain monitoring data of each urea spray gun according to a preset feedback time node and determine whether to generate a maintenance instruction.

[0024] In some embodiments of the present application, the third processing module is further used to:

[0025] Generate a smoke wear value P and a smoke evaluation value U according to the smoke parameters of the initial monitoring point a1;

[0026] Set the atomizing wind speed of the atomizing unit according to the flue gas abrasion value P;

[0027] Set the primary spray gun control plan according to the smoke evaluation value U;

[0028] Preset multiple update time nodes, and update the smoke wear value and smoke evaluation value according to the update time nodes;

[0029] Determine whether to generate a first-level update instruction based on the update result.

[0030] In some embodiments of the present application, when generating the smoke abrasion value P and the smoke evaluation value U, it includes:

[0031] Generate a first reference value H1 according to the flue gas flow rate at the initial monitoring point a1;

[0032] Generate a second reference value H2 according to the smoke particle content at the initial monitoring point a1;

[0033] Generate a flue gas wear value P;

[0034] P = e1 * H1 + e2 * H2;

[0035] Generate a smoke evaluation value U according to a preset smoke evaluation model;

[0036]

[0037] Among them, μi is the influencing factor of the i-th smoke evaluation index; ji is the reference value of the i-th smoke evaluation index at the initial monitoring point a1; θ is the number of smoke evaluation indicators.

[0038] In some embodiments of the present application, the fourth processing module is further used to:

[0039] Generate the denitrification amount difference of each monitoring point according to the flue gas parameters of all monitoring points;

[0040] Establish a denitrification amount difference matrix C, C = (c1, c2...ci...cn), where ci is the denitrification amount difference of the i-th monitoring point;

[0041] ci=βi*[(f' i－1 -f' i )-(f i－1 -f i) ];

[0042] Among them, βi is the compensation coefficient of the i-th monitoring point; f' i－1 is the expected nitrate content of flue gas at the i-1th monitoring point; f' i is the expected nitrate content of flue gas at the i-th monitoring point; i－1 is the actual nitrate content of flue gas at the i-1th monitoring point; f i is the actual nitrate content of flue gas at the i-th monitoring point;

[0043] It is determined whether to generate a correction instruction based on the denitration amount difference matrix C.

[0044] In some embodiments of the present application, determining whether to generate a correction instruction includes:

[0045] Preset a first denitration amount difference interval (C1, C2);

[0046] If ci is in the first denitration amount difference interval, no correction instruction is generated;

[0047] If ci is not in the first denitrification amount difference interval, the mapped urea spray gun of the ith monitoring point is obtained according to the monitoring point-urea spray gun mapping table, and a first-level correction instruction for all mapped urea spray guns of the ith monitoring point is generated.

[0048] In some embodiments of the present application, the first maintenance module is further used to:

[0049] According to the urea spray gun sequence B, bi is set as the target urea spray gun in sequence;

[0050] Obtain monitoring data of the target urea spray gun at the current feedback time node;

[0051] Generate a nozzle pressure value sequence D of the target urea spray gun at the current feedback time node, D = (d1, d2...di...dr), where di is the i-th nozzle pressure value collected at the current feedback time node; r is the number of nozzle pressure values ​​collected at the current feedback time node;

[0052] Generate an operation evaluation value g of the target urea spray gun at the current feedback time node;

[0053]

[0054] Among them, e3 is the preset third weight coefficient; e4 is the preset fourth weight coefficient; Q3 is the preset third fixed coefficient; Q4 is the preset fourth fixed coefficient; d' is the standard nozzle pressure of the target urea spray gun at the current feedback time node; Δd ​​is the average value of all data in the nozzle pressure value series D;

[0055] Preset operation evaluation value threshold G1;

[0056] If g>G1, a first-level maintenance instruction for the target urea spray gun is generated.

[0057] In some embodiments of the present application, a urea spray gun system control method is provided, comprising:

[0058] A plurality of equipment points and a plurality of monitoring points are set according to flue parameters, wherein the equipment points are provided with urea spray guns;

[0059] Establish the correlation model between each monitoring point according to the flue gas flow parameters, and establish the monitoring point-urea spray gun mapping table;

[0060] According to the smoke parameters at the initial monitoring point a1, the working parameters of the spray gun unit and the atomization unit are set;

[0061] Obtain the flue gas parameters of each monitoring point according to the preset feedback time node, and determine whether to generate a correction instruction;

[0062] The monitoring data of each urea spray gun is obtained according to the preset feedback time node, and it is determined whether to generate a maintenance instruction.

[0063] In some embodiments of the present application, when setting the working parameters of the spray gun unit and the working parameters of the atomization unit, it includes:

[0064] Generate a smoke wear value P and a smoke evaluation value U according to the smoke parameters of the initial monitoring point a1;

[0065] Set the atomizing wind speed of the atomizing unit according to the flue gas abrasion value P;

[0066] Set the primary spray gun control plan according to the smoke evaluation value U;

[0067] Preset multiple update time nodes, and update the smoke wear value and smoke evaluation value according to the update time nodes;

[0068] Determine whether to generate a first-level update instruction based on the update result.

[0069] In some embodiments of the present application, determining whether to generate a correction instruction includes:

[0070] Generate the denitrification amount difference of each monitoring point according to the flue gas parameters of all monitoring points;

[0071] Establish a denitrification amount difference matrix C, C = (c1, c2...ci...cn), where ci is the denitrification amount difference of the i-th monitoring point;

[0072] ci=βi*[(f' i－1 -f' i )-(f i－1 -f i) ];

[0073] Among them, βi is the compensation coefficient of the i-th monitoring point; f' i－1 is the expected nitrate content of flue gas at the i-1th monitoring point; f' i is the expected nitrate content of flue gas at the i-th monitoring point; i－1 is the actual nitrate content of flue gas at the i-1th monitoring point; f i is the actual nitrate content of flue gas at the i-th monitoring point;

[0074] Preset a first denitration amount difference interval (C1, C2);

[0075] If ci is in the first denitration amount difference interval, no correction instruction is generated;

[0076] If ci is not in the first denitrification amount difference interval, the mapped urea spray gun of the ith monitoring point is obtained according to the monitoring point-urea spray gun mapping table, and a first-level correction instruction for all mapped urea spray guns of the ith monitoring point is generated.

[0077] Compared with the prior art, the urea spray gun system and control method of the present application have the following beneficial effects:

[0078] By adding a spray unit, when the urea spray gun is working, atomized wind is generated to cover the area around the urea spray gun to prevent the urea spray gun from being worn by the flue gas, and to prevent solid particles in the flue gas from entering the urea spray gun and causing blockage. The atomized wind is at room temperature and can effectively cool the spray gun, thereby avoiding high temperature damage to the spray gun and reducing the risk of failure of the urea spray gun. At the same time, the atomized wind can further atomize the sprayed urea, improve the reaction efficiency of urea and flue gas, and thus improve the overall denitrification efficiency in the flue.

[0079] According to the direction of flue gas flow, multiple monitoring points are set up inside the flue to comprehensively monitor the flue gas in the flue, and the urea spray guns at different positions are dynamically adjusted according to the monitoring data to ensure the denitrification quality inside the flue while reducing the urea spraying amount, thereby reducing the overall operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0080] Figure 1 It is a structural schematic diagram of a urea spray gun system in the preferred embodiment of the present application. DETAILED DESCRIPTION

[0081] The specific implementation methods of the present application are further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but are not intended to limit the scope of the present application.

[0082] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0083] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0084] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0085] like Figure 1 As shown, a urea spray gun system according to a preferred embodiment of the present application includes:

[0086] The central control unit is used to set multiple equipment points and multiple monitoring points according to the flue parameters;

[0087] A spray gun unit, comprising a plurality of urea spray guns, wherein the urea spray guns are arranged at equipment points;

[0088] The spray gun unit is used to spray urea into the flue gas in the flue;

[0089] An atomization unit, comprising a plurality of atomization submodules, wherein the atomization submodules are arranged at the equipment point;

[0090] The atomizing unit is used to generate atomizing wind;

[0091] A monitoring unit, comprising a plurality of monitoring submodules, wherein the monitoring submodules are arranged at monitoring points;

[0092] The monitoring unit is used to collect the flue gas parameters in the flue;

[0093] The central control unit is also used to set the working parameters of the spray gun unit and the atomization unit according to the smoke parameters collected by the monitoring unit.

[0094] Specifically, the nozzle material of the urea spray gun is made of corrosion-resistant and high-temperature resistant materials (such as stainless steel or ceramics) to ensure the stability and durability of the nozzle in a high-temperature environment. A pressure sensor is also provided at the nozzle.

[0095] Specifically, the atomizing submodule is arranged at the rear of the urea spray gun, and uses the connection interface to provide atomizing wind when the urea spray gun is working, thereby covering the urea spray gun, so that the urea is atomized into droplets of suitable fineness and sprayed into the flue reaction area. The atomizing submodule is preferably a pneumatic atomizing device.

[0096] Specifically, the central control unit includes:

[0097] The first processing module is used to set a monitoring point sequence A, A = (a1, a2 ... ai ... an), where a1 is the initial monitoring point, ai is the i-th monitoring point through which the flue gas flows; n is the number of monitoring points;

[0098] The first processing module is also used to establish a correlation model between various monitoring points according to the smoke flow parameters;

[0099] The second processing module is used to establish a urea spray gun sequence B, B = (b1, b2...bi...bm), wherein bi is the i-th urea spray gun; m is the number of urea spray guns;

[0100] The second processing module is also used to establish a monitoring point-urea spray gun mapping table;

[0101] The third processing module is used to set the working parameters of the spray gun unit and the atomization unit according to the smoke parameters at the initial monitoring point a1;

[0102] The fourth processing module is used to obtain the flue gas parameters of each monitoring point according to the preset feedback time node, and determine whether to generate a correction instruction;

[0103] The first maintenance module is used to obtain monitoring data of each urea spray gun according to a preset feedback time node and determine whether to generate a maintenance instruction.

[0104] Specifically, the monitoring submodule is used to monitor flue gas data.

[0105] Specifically, two monitoring points are set at the same position on both sides of a single urea spray gun.

[0106] Specifically, the correlation model and the monitoring point-urea spray gun mapping table are constructed based on the location parameters between each monitoring point and each equipment point and the flue gas flow direction. Thus, the urea spray guns at different locations can be dynamically adjusted according to the monitoring data to ensure that each urea spray gun is always at the optimal spraying amount and improve the denitrification efficiency in the flue.

[0107] It can be understood that in the above embodiment, by adding a spray unit, when the urea spray gun is working, atomized wind is generated to cover the area around the urea spray gun, so as to prevent the urea spray gun from being worn by the flue gas, and at the same time prevent solid particles in the flue gas from entering the urea spray gun and causing blockage. The atomized wind is at room temperature and can effectively cool the spray gun, thereby avoiding high temperature damage to the spray gun and reducing the risk of failure of the urea spray gun. At the same time, the atomized wind can further atomize the sprayed urea, improve the reaction efficiency of urea and flue gas, and thus improve the overall denitrification efficiency in the flue.

[0108] In a preferred embodiment of the present application, the third processing module is also used for:

[0109] Generate a smoke wear value P and a smoke evaluation value U according to the smoke parameters of the initial monitoring point a1;

[0110] Set the atomizing wind speed of the atomizing unit according to the flue gas abrasion value P;

[0111] Set the primary spray gun control plan according to the smoke evaluation value U;

[0112] Preset multiple update time nodes, and update the smoke wear value and smoke evaluation value according to the update time nodes;

[0113] Determine whether to generate a first-level update instruction based on the update result.

[0114] Specifically, the initial monitoring point is set at the flue gas inlet.

[0115] Specifically, the smoke wear value P and the smoke evaluation value U are periodically updated according to the preset update cycle. If the difference between the smoke wear values ​​of two adjacent update time nodes exceeds the threshold, the atomizing wind speed is corrected. If the difference between the smoke evaluation values ​​of two adjacent update time nodes exceeds the threshold, the first-level spray gun control instruction is corrected.

[0116] Specifically, the difference threshold can be set according to historical data.

[0117] Specifically, the first-level spray gun control instruction refers to setting the spraying time period and urea spraying amount of each urea spray gun based on the flue gas parameters of the initial monitoring point, combined with the flue gas flow direction, flue gas flow speed, and the spraying area of ​​each urea spray gun, so as to achieve comprehensive denitrification of the flue gas in the flue, improve the overall denitrification efficiency, and reduce the overall urea spraying amount.

[0118] Specifically, a first reference value H1 is generated according to the flue gas flow rate at the initial monitoring point a1;

[0119] Generate a second reference value H2 according to the smoke particle content at the initial monitoring point a1;

[0120] Generate a flue gas wear value P;

[0121] P = e1 * H1 + e2 * H2;

[0122] Specifically, the first reference evaluation value and the second reference evaluation value are in the same value range. The greater the flue gas flow rate, the greater the corresponding first reference evaluation value, the higher the flue gas particle content, the greater the corresponding second reference evaluation value, the greater the flue gas wear value, and the greater the corresponding atomizing wind speed, thereby reducing the wear of the flue gas on the nozzle.

[0123] Specifically, a smoke evaluation value U is generated according to a preset smoke evaluation model;

[0124]

[0125] Among them, μi is the influencing factor of the i-th smoke evaluation index; ji is the reference value of the i-th smoke evaluation index at the initial monitoring point a1; θ is the number of smoke evaluation indicators.

[0126] Specifically, the flue gas evaluation indexes include, but are not limited to, multiple parameters such as flue gas temperature, flue gas nitrate content and flue gas flow rate. The larger the flue gas evaluation value, the greater the amount of urea required in the current flue.

[0127] It can be understood that in the above embodiment, by periodically adjusting the working parameters of the spray gun unit and the atomization unit, the flue gas in the flue is fully denitrated, the overall denitration efficiency is improved, and the overall urea spraying amount is reduced. At the same time, the wear of the nozzle by the flue gas is reduced, and the failure probability of the urea spray gun is reduced.

[0128] In a preferred embodiment of the present application, the fourth processing module is also used for:

[0129] Generate the denitrification amount difference of each monitoring point according to the flue gas parameters of all monitoring points;

[0130] Establish a denitrification amount difference matrix C, C = (c1, c2...ci...cn), where ci is the denitrification amount difference of the i-th monitoring point;

[0131] ci=βi*[(f' i－1 -f' i )-(f i－1 -f i) ];

[0132] Among them, βi is the compensation coefficient of the i-th monitoring point; f' i－1 is the expected nitrate content of flue gas at the i-1th monitoring point; f' i is the expected nitrate content of flue gas at the i-th monitoring point; i－1 is the actual nitrate content of flue gas at the i-1th monitoring point; f i is the actual nitrate content of flue gas at the i-th monitoring point;

[0133] It is determined whether to generate a correction instruction based on the denitration amount difference matrix C.

[0134] Specifically, an expected reaction model is constructed based on historical denitrification data, and the expected nitrate content of flue gas at each monitoring point is generated based on the expected reaction model, the position parameters of each urea spray gun and the primary spray gun control plan.

[0135] Specifically, when determining whether to generate a correction instruction, it includes:

[0136] Preset a first denitration amount difference interval (C1, C2);

[0137] If ci is in the first denitration amount difference interval, no correction instruction is generated;

[0138] If ci is not in the first denitrification amount difference interval, the mapped urea spray gun of the ith monitoring point is obtained according to the monitoring point-urea spray gun mapping table, and a first-level correction instruction for all mapped urea spray guns of the ith monitoring point is generated.

[0139] Specifically, the compensation coefficient can be set according to the location of different monitoring points. The closer to the flue outlet, the larger the corresponding compensation coefficient.

[0140] Specifically, if the denitrification amount difference is not within the preset range, it means that the spraying amount of the mapped urea spray gun corresponding to the current monitoring point has not reached the optimal value. If the difference is a positive value, it means that the spraying amount of the corresponding mapped urea spray gun is too low and the spraying amount needs to be increased. If the difference is a negative value, it means that the spraying amount of the corresponding mapped urea spray gun is too low and the spraying amount needs to be reduced.

[0141] It can be understood that in the above embodiment, according to the direction of flue gas flow, multiple monitoring points are set inside the flue to comprehensively monitor the flue gas, and the urea spray guns at different positions are dynamically adjusted according to the monitoring data to ensure the denitrification quality inside the flue while reducing the overall urea spraying amount, thereby reducing the overall operation and maintenance cost.

[0142] In a preferred embodiment of the present application, the first maintenance module is also used for:

[0143] According to the urea spray gun sequence B, bi is set as the target urea spray gun in sequence;

[0144] Obtain monitoring data of the target urea spray gun at the current feedback time node;

[0145] Generate a nozzle pressure value sequence D of the target urea spray gun at the current feedback time node, D = (d1, d2...di...dr), where di is the i-th nozzle pressure value collected at the current feedback time node; r is the number of nozzle pressure values ​​collected at the current feedback time node;

[0146] Generate an operation evaluation value g of the target urea spray gun at the current feedback time node;

[0147]

[0148] Among them, e3 is the preset third weight coefficient; e4 is the preset fourth weight coefficient; Q3 is the preset third fixed coefficient; Q4 is the preset fourth fixed coefficient; d' is the standard nozzle pressure of the target urea spray gun at the current feedback time node; Δd ​​is the average value of all data in the nozzle pressure value series D;

[0149] Preset operation evaluation value threshold G1;

[0150] If g>G1, a first-level maintenance instruction for the target urea spray gun is generated.

[0151] Specifically, its standard nozzle pressure can be set according to the spraying amount of the target urea spray gun in the first-level spray gun control plan corresponding to the current feedback time node.

[0152] It can be understood that in the above embodiment, the nozzle pressure of each urea spray gun is periodically monitored to ensure the stability of the injection effect, and at the same time, the risk status of each urea spray gun is warned in time and repaired in time to avoid affecting the denitrification efficiency due to urea spray gun failure.

[0153] Based on another preferred embodiment of a urea spray gun system in any of the above preferred embodiments, this preferred embodiment provides a urea spray gun system control method, including:

[0154] S101: multiple equipment points and multiple monitoring points are set according to flue parameters, and urea spray guns are set at the equipment points;

[0155] S102: establishing a correlation model between various monitoring points according to the flue gas flow parameters, and establishing a monitoring point-urea spray gun mapping table;

[0156] S103: setting the working parameters of the spray gun unit and the working parameters of the atomization unit according to the smoke parameters at the initial monitoring point a1;

[0157] S104: Obtaining the flue gas parameters of each monitoring point according to the preset feedback time node, and determining whether to generate a correction instruction;

[0158] S105: Acquire monitoring data of each urea spray gun according to a preset feedback time node, and determine whether to generate a maintenance instruction.

[0159] Specifically, when setting the working parameters of the spray gun unit and the atomization unit, it includes:

[0160] Generate a smoke wear value P and a smoke evaluation value U according to the smoke parameters of the initial monitoring point a1;

[0161] Set the atomizing wind speed of the atomizing unit according to the flue gas abrasion value P;

[0162] Set the primary spray gun control plan according to the smoke evaluation value U;

[0163] Preset multiple update time nodes, and update the smoke wear value and smoke evaluation value according to the update time nodes;

[0164] Determine whether to generate a first-level update instruction based on the update result.

[0165] In a preferred embodiment of the present application, when determining whether to generate a correction instruction, the process includes:

[0166] Generate the denitrification amount difference of each monitoring point according to the flue gas parameters of all monitoring points;

[0167] Establish a denitrification amount difference matrix C, C = (c1, c2...ci...cn), where ci is the denitrification amount difference of the i-th monitoring point;

[0168] ci=βi*[(f' i－1 -f' i )-(f i－1 -f i) ];

[0169] Among them, βi is the compensation coefficient of the i-th monitoring point; f' i－1 is the expected nitrate content of flue gas at the i-1th monitoring point; f' i is the expected nitrate content of flue gas at the i-th monitoring point; i－1 is the actual nitrate content of flue gas at the i-1th monitoring point; f i is the actual nitrate content of flue gas at the i-th monitoring point;

[0170] Preset a first denitration amount difference interval (C1, C2);

[0171] If ci is in the first denitration amount difference interval, no correction instruction is generated;

[0172] If ci is not in the first denitrification amount difference interval, the mapped urea spray gun of the ith monitoring point is obtained according to the monitoring point-urea spray gun mapping table, and a first-level correction instruction for all mapped urea spray guns of the ith monitoring point is generated.

[0173] According to the first concept of the present application, by adding a spray unit, when the urea spray gun is working, atomized wind is generated to cover the area around the urea spray gun, so as to prevent the urea spray gun from being worn by the flue gas, and at the same time prevent solid particles in the flue gas from entering the urea spray gun and causing blockage. The atomized wind is at room temperature and can effectively cool the spray gun, thereby avoiding high temperature damage to the spray gun and reducing the risk of failure of the urea spray gun. At the same time, the atomized wind can further atomize the sprayed urea, improve the reaction efficiency of urea and flue gas, thereby improving the overall denitrification efficiency in the flue.

[0174] According to the second concept of the present application, multiple monitoring points are set inside the flue according to the direction of flue gas flow, and the flue gas in the flue is comprehensively monitored. The urea spray guns at different positions are dynamically adjusted according to the monitoring data to ensure the denitrification quality inside the flue while reducing the urea spraying amount, thereby reducing the overall operation and maintenance costs.

[0175] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present application. These improvements and substitutions should also be regarded as the scope of protection of the present application.

Claims

1. A urea spray gun system, characterized in that: include: The central control unit is used to set multiple equipment points and multiple monitoring points according to the flue parameters; A spray gun unit, comprising a plurality of urea spray guns, wherein the urea spray guns are arranged at equipment points; The spray gun unit is used to spray urea into the flue gas; An atomization unit, comprising a plurality of atomization submodules, wherein the atomization submodules are arranged at the equipment point; The atomizing unit is used to generate atomizing wind; A monitoring unit, comprising a plurality of monitoring submodules, wherein the monitoring submodules are arranged at monitoring points; The monitoring unit is used to collect flue gas parameters in the flue; The central control unit is also used to set the working parameters of the spray gun unit and the atomization unit according to the smoke parameters collected by the monitoring unit.

2. The urea spray gun system according to claim 1, characterized in that: The central control unit comprises: The first processing module is used to set a monitoring point sequence A, A = (a1, a2 ... ai ... an), where a1 is the initial monitoring point, ai is the i-th monitoring point through which the flue gas flows; n is the number of monitoring points; The first processing module is also used to establish a correlation model between various monitoring points according to the smoke flow parameters; The second processing module is used to establish a urea spray gun sequence B, B = (b1, b2...bi...bm), wherein bi is the i-th urea spray gun; m is the number of urea spray guns; The second processing module is also used to establish a monitoring point-urea spray gun mapping table; The third processing module is used to set the working parameters of the spray gun unit and the atomization unit according to the smoke parameters at the initial monitoring point a1; The fourth processing module is used to obtain the flue gas parameters of each monitoring point according to the preset feedback time node, and determine whether to generate a correction instruction; The first maintenance module is used to obtain monitoring data of each urea spray gun according to a preset feedback time node and determine whether to generate a maintenance instruction.

3. The urea spray gun system according to claim 2, characterized in that: The third processing module is also used for: Generate a smoke wear value P and a smoke evaluation value U according to the smoke parameters of the initial monitoring point a1; Set the atomizing wind speed of the atomizing unit according to the flue gas abrasion value P; Set the primary spray gun control plan according to the smoke evaluation value U; Preset multiple update time nodes, and update the smoke wear value and smoke evaluation value according to the update time nodes; Determine whether to generate a first-level update instruction based on the update result.

4. The urea spray gun system according to claim 3, characterized in that: When generating the smoke wear value P and the smoke evaluation value U, it includes: Generate a first reference value H1 according to the flue gas flow rate at the initial monitoring point a1; Generate a second reference value H2 according to the smoke particle content at the initial monitoring point a1; Generate a flue gas wear value P; P = e1 * H1 + e2 * H2; Generate a smoke evaluation value U according to a preset smoke evaluation model; Among them, μi is the influencing factor of the i-th smoke evaluation index; ji is the reference value of the i-th smoke evaluation index at the initial monitoring point a1; θ is the number of smoke evaluation indicators.

5. The urea spray gun system according to claim 3, characterized in that: The fourth processing module is further used for: Generate the denitrification amount difference of each monitoring point according to the flue gas parameters of all monitoring points; Establish a denitrification amount difference matrix C, C = (c1, c2...ci...cn), where ci is the denitrification amount difference of the i-th monitoring point; ci=βi*[(f' i－1 -f' i )-(f i－1 -f i) ]; Among them, βi is the compensation coefficient of the i-th monitoring point; f' i－1 is the expected nitrate content of flue gas at the i-1th monitoring point; f' i is the expected nitrate content of flue gas at the ith monitoring point; i－1 is the actual nitrate content of flue gas at the i-1th monitoring point; f i is the actual nitrate content of flue gas at the i-th monitoring point; It is determined whether to generate a correction instruction based on the denitration amount difference matrix C.

6. The urea spray gun system according to claim 5, characterized in that: When judging whether to generate a correction instruction, it includes: Preset a first denitration amount difference interval (C1, C2); If ci is in the first denitration amount difference interval, no correction instruction is generated; If ci is not in the first denitrification amount difference interval, the mapped urea spray gun of the ith monitoring point is obtained according to the monitoring point-urea spray gun mapping table, and a first-level correction instruction for all mapped urea spray guns of the ith monitoring point is generated.

7. The urea spray gun system according to claim 6, characterized in that: The first maintenance module is also used for: According to the urea spray gun sequence B, bi is set as the target urea spray gun in sequence; Obtain monitoring data of the target urea spray gun at the current feedback time node; Generate a nozzle pressure value sequence D of the target urea spray gun at the current feedback time node, D = (d1, d2...di...dr), where di is the i-th nozzle pressure value collected at the current feedback time node; r is the number of nozzle pressure values ​​collected at the current feedback time node; Generate an operation evaluation value g of the target urea spray gun at the current feedback time node; Among them, e3 is the preset third weight coefficient; e4 is the preset fourth weight coefficient; Q3 is the preset third fixed coefficient; Q4 is the preset fourth fixed coefficient; d' is the standard nozzle pressure of the target urea spray gun at the current feedback time node; Δd ​​is the average value of all data in the nozzle pressure value series D; Preset operation evaluation value threshold G1; If g>G1, a first-level maintenance instruction for the target urea spray gun is generated.

8. A urea spray gun system control method, applied to the urea spray gun system according to any one of claims 1 to 7, characterized in that: include: A plurality of equipment points and a plurality of monitoring points are set according to flue parameters, wherein the equipment points are provided with urea spray guns; Establish the correlation model between each monitoring point according to the flue gas flow parameters, and establish the monitoring point-urea spray gun mapping table; According to the smoke parameters at the initial monitoring point a1, the working parameters of the spray gun unit and the atomization unit are set; Obtain the flue gas parameters of each monitoring point according to the preset feedback time node, and determine whether to generate a correction instruction; The monitoring data of each urea spray gun is obtained according to the preset feedback time node, and it is determined whether to generate a maintenance instruction.

9. The urea spray gun system control method according to claim 8, characterized in that: When setting the working parameters of the spray gun unit and the atomization unit, include: Generate a smoke wear value P and a smoke evaluation value U according to the smoke parameters of the initial monitoring point a1; Set the atomizing wind speed of the atomizing unit according to the flue gas abrasion value P; Set the primary spray gun control plan according to the smoke evaluation value U; Preset multiple update time nodes, and update the smoke wear value and smoke evaluation value according to the update time nodes; Determine whether to generate a first-level update instruction based on the update result.

10. The urea spray gun system control method according to claim 9, characterized in that: When judging whether to generate a correction instruction, it includes: Generate the denitrification amount difference of each monitoring point according to the flue gas parameters of all monitoring points; Establish a denitrification amount difference matrix C, C = (c1, c2...ci...cn), where ci is the denitrification amount difference of the i-th monitoring point; ci=βi*[(f' i－1 -f' i )-(f i－1 -f i) ]; Among them, βi is the compensation coefficient of the i-th monitoring point; f' i－1 is the expected nitrate content of flue gas at the i-1th monitoring point; f' i is the expected nitrate content of flue gas at the ith monitoring point; i－1 is the actual nitrate content of flue gas at the i-1th monitoring point; f i is the actual nitrate content of flue gas at the i-th monitoring point; Preset a first denitration amount difference interval (C1, C2); If ci is in the first denitration amount difference interval, no correction instruction is generated; If ci is not in the first denitrification amount difference interval, the mapped urea spray gun of the ith monitoring point is obtained according to the monitoring point-urea spray gun mapping table, and a first-level correction instruction for all mapped urea spray guns of the ith monitoring point is generated.

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