A flue gas dry denitration feeding method, system, storage medium and intelligent terminal

Abstract

The application relates to a flue gas dry denitration feeding method and system, a storage medium and an intelligent terminal, relates to the field of flue gas denitration processes, and comprises the following steps: acquiring an oxygen concentration detector number and corresponding oxygen concentration; searching for a coverage area number; searching for a denitration agent spray gun number; spraying high-molecular denitration agent from the denitration agent spray gun corresponding to the denitration agent spray gun number according to a test spraying amount, and determining an oxygen concentration change trend according to the oxygen concentration after spraying; searching for a unit spraying amount; spraying high-molecular denitration agent from the denitration agent spray gun corresponding to the denitration agent spray gun number according to the unit spraying amount, and continuing to analyze the oxygen concentration change trend; and when the oxygen concentration change trend is equal to 0, controlling the denitration agent spray gun to stop spraying. The application has the effect that the reaction efficiency is embodied by the oxygen concentration change trend, so that the spraying amount of the high-molecular denitration agent in the next time is controlled, the situation that the high-molecular denitration agent is excessively wasted is avoided, and the use efficiency and the reaction efficiency of the high-molecular denitration agent are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of flue gas denitration process, in particular to a flue gas dry denitration feeding method, system, storage medium and intelligent terminal. BACKGROUND

[0002] Flue gas denitration refers to the process of reducing nitrogen oxides in combustion flue gas to nitrogen, thereby removing nitrogen oxides in flue gas. Due to the importance of preventing environmental pollution, flue gas denitration has been sharply proposed as a worldwide problem.

[0003] Polymer dry denitration is the latest technology for modern boiler flue gas denitration in China. The denitration agent is a powder material formed by loading amino components on a high molecular material as a carrier. The powder material is directly sprayed into the furnace by using a pneumatic conveying device, and the spraying temperature window is between 780-900℃. At high temperature, the chemical bond between amino and high molecular is broken, releasing a large amount of amino functional groups. Amino reacts with NOx in flue gas to achieve the purpose of removing NOx.

[0004] In the prior art, in order to completely react the nitrogen oxides, an excessive amount of denitration agent is often sprayed, and a large amount of denitration agent may be discharged with the gas, resulting in low denitration conversion rate of the denitration agent, which still has room for improvement. SUMMARY

[0005] In order to improve the problem that a large amount of denitration agent may be discharged with the gas, resulting in low denitration conversion rate of the denitration agent, the present application provides a flue gas dry denitration feeding method, system, storage medium and intelligent terminal.

[0006] In a first aspect, the present application provides a flue gas dry denitration feeding method, which adopts the following technical solution:

[0007] A flue gas dry denitration feeding method, comprising:

[0008] Obtaining oxygen concentration detector number and corresponding oxygen concentration;

[0009] Finding the corresponding coverage area number from the preset position database according to the oxygen concentration detector number;

[0010] Finding the corresponding denitration agent lance number from the preset lance database according to the coverage area number;

[0011] Spraying the denitration agent lance corresponding to the denitration agent lance number with a preset test spraying amount of high molecular denitration agent, and determining the oxygen concentration change trend according to the oxygen concentration;

[0012] Find the corresponding unit injection amount from the preset reaction database according to the oxygen concentration and the oxygen concentration change trend;

[0013] Spray the high-molecular denitration agent from the denitration agent lance corresponding to the lance number according to the unit injection amount and continue to analyze the oxygen concentration change trend;

[0014] When the oxygen concentration change trend is equal to 0, control the denitration agent lance corresponding to the lance number to stop spraying.

[0015] By adopting the above technical scheme, since the oxygen concentration change trend can basically represent the reaction speed, that is, the concentration of nitrogen oxides, the reaction efficiency can be reflected through the oxygen concentration change trend, so as to control the injection amount of the high-molecular denitration agent next time, ensure that the injection amount and the nitrogen-containing substance concentration are matched, and the overwaste of the high-molecular denitration agent is not easy to occur, thereby improving the use efficiency and reaction efficiency of the high-molecular denitration agent.

[0016] Optionally, the method for controlling the denitration agent lance corresponding to the lance number to stop spraying when the oxygen concentration change trend is equal to 0 comprises:

[0017] According to the coverage area number, find the corresponding nitrogen oxide detector number from the position database in reverse;

[0018] When the oxygen concentration change trend is equal to 0, find the corresponding oxygen lance number from the lance database based on the denitration agent lance number; control the denitration agent lance corresponding to the lance number to stop spraying, and after the lance corresponding to the oxygen lance number sprays a preset test amount of oxygen, acquire the nitrogen-containing substance concentration trend on the nitrogen oxide detector number;

[0019] When the nitrogen-containing substance concentration trend changes, continue to spray a preset test amount of oxygen from the lance corresponding to the oxygen lance number, and continue to acquire the nitrogen-containing substance concentration trend on the nitrogen oxide detector number;

[0020] When the nitrogen-containing substance concentration trend is equal to 0, control the denitration agent lance corresponding to the lance number to stop spraying and control the lance corresponding to the oxygen lance number to stop spraying.

[0021] By adopting the above technical scheme, although the oxygen concentration change trend is 0, it is possible that the oxygen concentration is too low to cause the chemical reaction to fail to occur, so the content of oxygen is increased to test whether the nitrogen oxides have been completely reacted, thereby determining whether the nitrogen oxides are residual, and improving the denitration efficiency of the high-molecular denitration agent.

[0022] Optionally, the method for controlling the denitration agent lance corresponding to the lance number to stop spraying and controlling the lance corresponding to the oxygen lance number to stop spraying when the nitrogen-containing substance concentration trend is equal to 0 comprises:

[0023] The first coverage area number is defined as the first coverage area number when the oxygen concentration change trend is equal to 0 and the nitrogen-containing substance concentration trend is equal to 0.

[0024] When the oxygen concentration change trend is equal to 0 and the nitrogen-containing substance concentration trend is equal to 0 in the area corresponding to the first coverage area number, the adjacent area number is determined based on the first coverage area number, and the area number is defined as the adjacent area number.

[0025] When the oxygen concentration change trend is not equal to 0, the corresponding air blower set number is found from the preset guide database according to the first coverage area number and the adjacent area number.

[0026] The air blower set corresponding to the air blower set number is controlled to introduce the air in the area corresponding to the first coverage area number into the area corresponding to the adjacent area number, and the air in the area corresponding to the adjacent area number into the area corresponding to the first coverage area number, and the denitration agent lance numbers corresponding to the first coverage area number and the adjacent area number are re-sprayed in the corresponding areas.

[0027] When the oxygen concentration change trends of both are equal to 0 and the nitrogen-containing substance concentration trends are equal to 0, the denitration agent lance numbers corresponding to the first coverage area number and the adjacent area number are stopped spraying, and the adjacent area number is updated to the first coverage area number and the adjacent area number is re-determined.

[0028] By using the above technical solution, the mixed air in the area that has not completed denitration is sent into the area that has completed denitration, and the clean air that has completed denitration is sent into the area that has not completed denitration, so that the air in the two areas is mixed, the lances in the two areas work synchronously to complete denitration, and the situation that one lance works for a long time while the other lance stops working and rests is avoided, thereby improving the efficiency of denitration.

[0029] Optionally, when the oxygen concentration change trends of both are equal to 0 and the nitrogen-containing substance concentration trends are equal to 0, the method for stopping the denitration agent lance numbers corresponding to the first coverage area number and the adjacent area number from spraying includes:

[0030] When the oxygen concentration change trends of both are equal to 0, the air blower set corresponding to the air blower set number stops working, and the oxygen lance corresponding to the oxygen lance number is controlled to spray oxygen.

[0031] Before the nitrogen-containing substance concentration trends of both are equal to 0, the first coverage area number and the adjacent area number are determined according to the nitrogen-containing substance concentration trend that first reaches 0, the area number is defined as the first area number, and the area number that has not reached 0 is defined as the second area number.

[0032] Control one of the induced draft fans corresponding to the number of the induced draft fan to introduce the air in the first coverage area number into the area corresponding to the second area number;

[0033] Stop the rotation of the induced draft fan corresponding to the number of the induced draft fan and control the stop of the injection of the oxygen lance corresponding to the number of the oxygen lance when the nitrogen oxide concentration trend is equal to 0.

[0034] By adopting the above technical solution, when the reaction in one area is completed and there is no excess nitrogen oxide to be reacted, the excess oxygen in the area can be sent to the adjacent area for complete reaction test, without the need for the oxygen lance to re-inject oxygen, thereby improving the utilization efficiency of oxygen.

[0035] Optionally, the method for controlling the stop of the injection of the denitration agent lance corresponding to the number of the denitration agent lance and the stop of the injection of the oxygen lance corresponding to the number of the oxygen lance when the nitrogen oxide concentration trend is equal to 0 comprises:

[0036] Determine the amino group concentration based on the nitrogen oxide concentration trend;

[0037] Obtain the current furnace temperature when the amino group concentration is greater than the preset critical concentration;

[0038] Determine the reduced temperature difference based on the current furnace temperature and the preset reverse reaction temperature;

[0039] Calculate the water vapor temperature based on the preset excess weight, the amino group concentration and the reduced temperature difference;

[0040] Control the denitration agent lance corresponding to the number of the denitration agent lance to inject the water vapor corresponding to the water vapor temperature without injecting the high-molecular denitration agent, control the boiler pressure to be the preset reverse reaction pressure, and continuously obtain the amino group concentration;

[0041] Control the stop of the injection of the denitration agent lance corresponding to the number of the denitration agent lance and the stop of the injection of the oxygen lance corresponding to the number of the oxygen lance when the amino group concentration is less than the critical concentration.

[0042] By adopting the above technical solution, when the reaction is completed and there is still nitrogen oxide concentration, the amino group concentration is obtained at this time, and the compound corresponding to the amino group is ammonia gas at this time. The ammonia gas is re-converted into urea at a specific reverse reaction temperature, on the one hand, the unused ammonia gas is stored for subsequent use, thereby improving the utilization efficiency of the high-molecular denitration agent; on the other hand, the ammonia gas is prevented from running out to affect the environment, thereby improving the environmental protection of the denitration system.

[0043] Optionally, the method for controlling the denitration agent lance corresponding to the number of the denitration agent lance to inject the high-molecular denitration agent according to the unit injection amount comprises:

[0044] Determine the increased temperature difference based on the current furnace temperature and the preset positive reaction temperature;

[0045] calculate the water vapor amount according to the unit injection amount and the preset positive reaction ratio when the temperature difference is greater than 0;

[0046] determine the water vapor temperature according to the water vapor amount, the temperature difference, and the region size corresponding to the region number;

[0047] mix the high-molecular denitration agent corresponding to the unit injection amount and the water vapor amount at the water vapor temperature, and then inject the mixture through the denitration agent lance corresponding to the denitration agent lance number.

[0048] By using the above technical solution, if the temperature in the furnace is low, the temperature of the water vapor is increased to a certain extent, the temperature of the furnace is controlled to reach the temperature of the positive reaction, the high-molecular denitration agent and the water vapor generate ammonia and carbon dioxide at the temperature of the positive reaction, and the efficiency of the positive reaction is improved.

[0049] Optionally, the method of injecting through the denitration agent lance corresponding to the denitration agent lance number comprises:

[0050] obtain the propagation direction and speed of the flue gas in the furnace;

[0051] find the corresponding sufficient reaction time from the preset time database according to the oxygen concentration change trend;

[0052] determine the reaction distance based on the propagation speed and the sufficient reaction time;

[0053] calculate the sprint distance according to the reaction distance, the preset outlet position, and the lance position;

[0054] when the sprint distance is greater than 0, calculate the vertical injection direction based on the sprint distance and the lance position;

[0055] inject the denitration agent lance corresponding to the denitration agent lance number in the direction of the vertical injection direction;

[0056] when the impact distance is less than 0, inject the denitration agent lance corresponding to the denitration agent lance number in the direction of the preset flush injection direction.

[0057] By using the above technical solution, by rotating the opening of the lance around the circumference, on the one hand, the nitrogen oxides in the flue gas in a region are uniformly contacted with the high-molecular denitration agent injected by the lance; on the other hand, the flue gas is stirred to uniformly mix the nitrogen oxides and the high-molecular denitration agent, thereby improving the uniformity of the mixture of the nitrogen oxides and the high-molecular denitration agent.

[0058] In a second aspect, the application provides a flue gas dry denitration feeding system, which adopts the following technical solution:

[0059] A flue gas dry denitration feeding system comprises:

[0060] an acquisition module configured to acquire an oxygen concentration detector number, an oxygen concentration, a current furnace temperature, a flue gas propagation direction, and a propagation speed;

[0061] a memory configured to store a program of the control method of any one of the flue gas dry denitrification feeding methods;

[0062] a processor, the program in the memory being loadable and executable by the processor and implementing the control method of any one of the flue gas dry denitrification feeding methods.

[0063] By using the above technical solution, since the oxygen concentration change trend can basically represent the reaction speed, that is, the concentration of nitrogen oxides, the reaction efficiency can be reflected through the oxygen concentration change trend, so as to control the injection amount of the high molecular denitration agent in the next time, ensure that the injection amount and the nitrogen-containing substance concentration are matched, and the overwaste of the high molecular denitration agent is not easily caused, and the use efficiency and the reaction efficiency of the high molecular denitration agent are improved.

[0064] In a third aspect, the present application provides an intelligent terminal, which adopts the following technical solution:

[0065] The intelligent terminal comprises a memory and a processor, and the memory stores a computer program capable of being loaded and executed by the processor to implement any one of the flue gas dry denitrification feeding methods.

[0066] By using the above technical solution, since the oxygen concentration change trend can basically represent the reaction speed, that is, the concentration of nitrogen oxides, the reaction efficiency can be reflected through the oxygen concentration change trend, so as to control the injection amount of the high molecular denitration agent in the next time, ensure that the injection amount and the nitrogen-containing substance concentration are matched, and the overwaste of the high molecular denitration agent is not easily caused, and the use efficiency and the reaction efficiency of the high molecular denitration agent are improved.

[0067] In a fourth aspect, the present application provides a computer storage medium, which can store a corresponding program and has the characteristics of large memory and fast data interaction.

[0068] The computer readable storage medium adopts the following technical solution:

[0069] The computer readable storage medium stores a computer program capable of being loaded and executed by the processor to implement any one of the flue gas dry denitrification feeding methods.

[0070] By adopting the technical scheme, since the oxygen concentration change trend can basically represent the reaction speed, that is, the concentration of nitrogen oxides, the reaction efficiency can be reflected through the oxygen concentration change trend, so as to control the injection amount of the polymer denitration agent next time, ensure that the injection amount and the nitrogen-containing substance concentration are matched, and the overwaste of the polymer denitration agent is not caused, and the use efficiency and the reaction efficiency of the polymer denitration agent are improved.

[0071] In summary, the present application includes at least the following beneficial technical effects:

[0072] 1. The reaction efficiency is reflected through the oxygen concentration change trend, so as to control the injection amount of the polymer denitration agent next time, and the overwaste of the polymer denitration agent is not caused, and the use efficiency and the reaction efficiency of the polymer denitration agent are improved; 2. Whether the nitrogen oxides are completely reacted is tested by increasing the oxygen content, so as to determine whether the nitrogen oxides are residual, and the denitration efficiency of the polymer denitration agent is improved;

[0073] 3. The ammonia gas is reconverted into urea, and the unused ammonia gas is stored for subsequent use, and the use efficiency of the polymer denitration agent is improved. BRIEF DESCRIPTION OF DRAWINGS

[0074] Figure 1 is a flow chart of a flue gas dry denitration feeding method in an embodiment of the present application.

[0075] Figure 2 is a schematic diagram of a boiler combustion system in an embodiment of the present application.

[0076] Figure 3 is a top view of a furnace area lance distribution in an embodiment of the present application.

[0077] Figure 4 is a flow chart of a method for controlling the denitration agent lance corresponding to the denitration agent lance number to stop spraying when the oxygen concentration change trend is equal to 0 in an embodiment of the present application.

[0078] Figure 5 is a flow chart of a method for controlling the denitration agent lance corresponding to the denitration agent lance number to stop spraying and controlling the lance corresponding to the oxygen lance number to stop spraying when the nitrogen-containing substance concentration trend is equal to 0 in an embodiment of the present application.

[0079] Figure 6 is a flow chart of a method for stopping the denitration agent lance corresponding to the first coverage area number and the adjacent area number to spray when the oxygen concentration change trend of both is equal to 0 and the nitrogen-containing substance concentration trend is equal to 0 in an embodiment of the present application.

[0080] Figure 7is a flow chart of a method for controlling a desulfurization agent injection lance corresponding to a desulfurization agent injection lance number to stop injection and controlling an oxygen injection lance corresponding to an oxygen injection lance number to stop injection when a nitrogen-containing substance concentration trend is equal to 0 in the embodiment of the present application.

[0081] Figure 8 is a flow chart of a method for injecting a desulfurization agent injection lance corresponding to a desulfurization agent injection lance number with a unit injection amount of a high-molecular desulfurization agent in the embodiment of the present application.

[0082] Figure 9 is a flow chart of a method for injecting a desulfurization agent injection lance corresponding to a desulfurization agent injection lance number in the embodiment of the present application.

[0083] Figure 10 is a system module diagram of a flue gas dry desulfurization feeding method in the embodiment of the present application. DETAILED DESCRIPTION

[0084] In order to make the objectives, technical solutions and advantages of the present application clearer, the following further describes the present application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application. Figures 1-10 The present application is described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0085] The embodiment of the present application discloses a flue gas dry desulfurization feeding method. Referring to Figure 1 , a flue gas dry desulfurization feeding method includes:

[0086] Step 100: Obtain an oxygen concentration detector number and a corresponding oxygen concentration.

[0087] The oxygen concentration detector number is the number of a detector for detecting the oxygen concentration. The acquisition method here is a sequential selection method, that is, after all the oxygen concentration detectors are numbered, they are selected in a certain order, for example, the size of the number. The purpose of numbering is to determine which instrument. The oxygen concentration is the oxygen concentration detected by the detector corresponding to the oxygen concentration detector number. Here, the chemical formula of the high-molecular desulfurization agent is CO(NH2)2, and the chemical reaction equation of the desulfurization process is as follows: Therefore, by detecting the change of the oxygen concentration, the internal reaction can be known.

[0088] The overall reaction process is in the furnace area of the boiler as Figure 2 indicated. Both sides are provided with a stock bin loaded with a high-molecular desulfurization agent to desulfurize the flue gas passing through the furnace area. As Figure 3As shown, the denitration agent injection lance is provided around the furnace, and the high molecular denitration agent in powder form is carried inside and directly injected into the furnace by the pneumatic conveying device, and the temperature window of the injection is between 780-900℃. At high temperature, the chemical bond between the amino group and the high molecule is broken, and a large amount of amino functional group is released, which reacts with the NOx in the flue gas to achieve the purpose of removing NOx.

[0089] Step 101: Find the corresponding coverage area number from the preset position database according to the oxygen concentration detector number.

[0090] The coverage area number is shown as the area after the furnace area is divided, and each area corresponds to an oxygen concentration detector. The mapping relationship between the oxygen concentration detector number and the coverage area number is stored in the database, which is recorded and stored by the workers in the field according to the actual installation condition. When the system receives the corresponding oxygen concentration detector number, it automatically finds the corresponding coverage area number from the database for output. Figure 3

[0091] Step 102: Find the corresponding denitration agent injection lance number from the preset injection lance database according to the coverage area number.

[0092] The denitration agent injection lance number is the number of the injection lance for injecting the denitration agent. The mapping relationship between the coverage area number and the denitration agent injection lance number is stored in the injection lance database. Similar to the establishment of the position database, when the corresponding denitration agent injection lance is installed and numbered, the actual installation condition is automatically recorded and stored. When the system receives the corresponding coverage area number, it automatically finds the corresponding denitration agent injection lance number from the database for output.

[0093] Step 103: The denitration agent injection lance corresponding to the denitration agent injection lance number is injected with the preset test injection amount of high molecular denitration agent, and the oxygen concentration change trend is determined according to the oxygen concentration.

[0094] The test injection amount is the injection amount for measuring the reaction effect of oxygen. The oxygen concentration change trend is the change trend of the oxygen concentration during the chemical reaction after the test injection amount is injected. The oxygen concentration change trend indirectly reflects the amount of oxygen that can react with the amino group, and thus indirectly reflects the concentration and change trend of nitrogen oxides. When the oxygen concentration decreases to a certain extent, although there is still oxygen, it will not react due to the low concentration. Therefore, the oxygen concentration change trend reflects the speed of contact and reaction in the chemical reaction, thereby objectively reflecting the amount of oxygen that can react inside.

[0095] ​Here, although the concentration of nitrogen oxides can be detected by the nitrogen oxide detector, since the detection of nitrogen oxides is also affected by the detection of amino groups, when the high molecular denitration agent is injected, the concentration of amino groups becomes larger and larger, and the concentration of nitrogen oxides becomes lower and lower during the reaction, so it is difficult to determine the concentration of nitrogen oxides by the change in the data on the nitrogen oxide detector, so the oxygen concentration can be indirectly reflected, and the greater the change trend of the oxygen concentration, the higher the concentration of nitrogen oxides, and the faster the reaction.

[0096] Step 104: Find the corresponding unit injection amount from the preset reaction database according to the oxygen concentration and the change trend of the oxygen concentration.

[0097] The unit injection amount is the best injection amount of the high molecular denitration agent for subsequent injection. The database stores the mapping relationship of oxygen concentration, change trend of oxygen concentration and corresponding unit injection amount. The same oxygen concentration and the same oxygen concentration change trend are measured by the workers in the field after adding a certain amount of denitration agent to the flue gas, and then different amounts of high molecular denitration agent are injected, and the change trend of oxygen concentration is observed. The injection amount of the high molecular denitration agent with the maximum change trend of oxygen concentration and the least amount of high molecular denitration agent is recorded as the unit injection amount. When the system receives the corresponding oxygen concentration and the change trend of oxygen concentration, the corresponding unit injection amount is automatically found from the database and output.

[0098] Step 105: The denitration agent lance corresponding to the denitration agent lance number is injected with the unit injection amount of high molecular denitration agent, and the change trend of oxygen concentration is continuously analyzed.

[0099] Step 106: Control the denitration agent lance corresponding to the denitration agent lance number to stop injecting when the change trend of oxygen concentration is equal to 0.

[0100] When the change trend of oxygen concentration is equal to 0, it means that even if more high molecular denitration agent is injected, there will be no reaction, at this time, it is very likely that the nitrogen oxides have been completely reacted, so the injection can be stopped.

[0101] Reference Figure 4 The method for controlling the denitration agent lance corresponding to the denitration agent lance number to stop injecting when the change trend of oxygen concentration is equal to 0 comprises:

[0102] Step 200: Find the corresponding nitrogen oxide detector number from the position database according to the coverage area number.

[0103] The nitrogen oxide detector number is the number of the detector that detects the nitrogen oxide concentration in the area corresponding to the area number. The mapping relationship between the area number and the nitrogen oxide detector number is also stored in the position database, which can be established by step 101, and will not be repeated here. When the system receives the corresponding area number, it automatically finds the corresponding nitrogen oxide detector number from the database and outputs it.

[0104] Step 201: When the oxygen concentration change trend is equal to 0, find the corresponding oxygen lance number from the lance database based on the denitration agent lance number.

[0105] The oxygen lance number is the number of the lance that sprays oxygen. The mapping relationship between the denitration agent lance number and the oxygen lance number is also stored in the database. The database is established by step 102, and will not be repeated here. When the system receives the denitration agent lance number, it automatically finds the corresponding oxygen lance number from the database and outputs it.

[0106] Step 202: Control the denitration agent lance corresponding to the denitration agent lance number to stop spraying, and spray a preset test amount of oxygen from the lance corresponding to the oxygen lance number, and then obtain the nitrogen-containing substance concentration trend on the nitrogen oxide detector number.

[0107] The test amount is a fixed numerical value input for testing whether the nitrogen oxide reflects the complete oxygen content. The nitrogen-containing substance concentration trend is the trend change of the nitrogen-containing substance concentration. Here, since the data detected by the nitrogen oxide detector contains not only nitrogen oxide but also amino, only the nitrogen-containing substance concentration is detected, and then the nitrogen-containing substance concentration trend is obtained according to the change. When the denitration agent lance corresponding to the denitration agent lance number stops spraying, the nitrogen-containing substance concentration change trend is the amount of reaction of nitrogen oxide and amino, that is, at least indicates that there is still nitrogen oxide.

[0108] Step 203: Continue to spray a preset test amount of oxygen from the lance corresponding to the oxygen lance number when the nitrogen-containing substance concentration trend changes, and continue to obtain the nitrogen-containing substance concentration trend on the nitrogen oxide detector number.

[0109] When the nitrogen-containing substance concentration trend changes, it means that there is at least nitrogen oxide in it, which means that the reason for the oxygen concentration change trend being 0 is that the oxygen content is low and no reaction occurs.

[0110] It should be noted that since the oxygen concentration changes here, the concentration can be predicted, so at this time the denitration agent lance corresponding to the denitration agent lance number will still be controlled to spray the polymer denitration agent according to the unit spraying amount according to the oxygen concentration change trend after the test amount is increased, until the oxygen concentration change trend is 0, and then continue to spray the test amount of oxygen.

[0111] Step 204: controlling the denitration agent spray gun corresponding to the denitration agent spray gun number to stop spraying and controlling the oxygen spray gun corresponding to the oxygen spray gun number to stop spraying when the nitrogenous substance concentration trend is equal to 0.

[0112] When the nitrogenous substance concentration trend is equal to 0, the oxygen concentration change trend is also 0 at this time, at this time, the high molecular denitration agent will not continue to increase, and the concentration of amino groups will not increase, at this time, if the nitrogenous substance concentration trend is equal to 0, it can be comprehensively explained that the reaction of nitrogen oxides is complete, so the denitration agent spray gun corresponding to the denitration agent spray gun number and the oxygen spray gun corresponding to the oxygen spray gun number can be stopped to stop spraying.

[0113] Referring to Figure 5 , the method for controlling the denitration agent spray gun corresponding to the denitration agent spray gun number to stop spraying and controlling the oxygen spray gun corresponding to the oxygen spray gun number to stop spraying when the nitrogenous substance concentration trend is equal to 0 comprises the following steps:

[0114] Step 300: defining the coverage area number of the first oxygen concentration change trend equal to 0 and the nitrogenous substance concentration trend equal to 0 as the first coverage area number.

[0115] The first coverage area number is the first area that has been completely denitrified.

[0116] Step 301: when the oxygen concentration change trend equal to 0 and the nitrogenous substance concentration trend equal to 0 appear in the area corresponding to the first coverage area number, determining the adjacent area number based on the first coverage area number, and defining the area number as the adjacent area number.

[0117] Step 302: when the oxygen concentration change trend is not equal to 0, finding the corresponding induced fan group number from the preset guide database according to the first coverage area number and the adjacent area number.

[0118] The induced fan group number is the number of the combination of the guide machine. As Figure 3 shown, an induced fan group is arranged between two adjacent areas to introduce the air in any one of the two adjacent areas into the other area. Here, there can be two, one introducing the air in the area corresponding to the first coverage area number into the area corresponding to the adjacent area number, and the other introducing the air in the area corresponding to the adjacent area number into the area corresponding to the first coverage area number. The mapping relationship of the first coverage area number, the adjacent area number and the induced fan group number is stored in the database, which is obtained by recording the corresponding numbers by the workers in the field according to the actual installation. When the system receives the first coverage area number and the adjacent area number, the corresponding induced fan group number is automatically found from the database and output.

[0119] Step 303: Control the air induction fan group corresponding to the air induction fan group number to introduce the air of the region corresponding to the first coverage region number into the region corresponding to the adjacent region number and introduce the air of the region corresponding to the adjacent region number into the region corresponding to the first coverage region number, and re-perform the injection of the high molecular denitration agent in the denitration agent injection gun numbers corresponding to the first coverage region number and the adjacent region number in the corresponding regions.

[0120] After the air induction fan group corresponding to the air induction fan group number is controlled to introduce the air of the region corresponding to the first coverage region number into the region corresponding to the adjacent region number and introduce the air of the region corresponding to the adjacent region number into the region corresponding to the first coverage region number, the air between the two regions is mixed, although the nitrogen oxide is not reduced, the denitration is performed by 2 groups of injection guns, and the denitration efficiency is improved.

[0121] Step 304: When the oxygen concentration change trends of the two regions are both equal to 0 and the nitrogen-containing substance concentration trends are both equal to 0, stop the injection of the denitration agent injection gun numbers corresponding to the first coverage region number and the adjacent region number, update the adjacent region number to the first coverage region number, and determine the adjacent region number again.

[0122] When the oxygen concentration change trends of the two regions are both equal to 0 and the nitrogen-containing substance concentration trends are both equal to 0, it indicates that the denitration of the two regions has been completed, so the operation can be performed on other regions in turn. The purpose of updating the adjacent region number to the first coverage region number is to expand the search and mixing of other regions that have not yet reacted completely.

[0123] Reference Figure 6 When the oxygen concentration change trends of the two regions are both equal to 0 and the nitrogen-containing substance concentration trends are both equal to 0, the method for stopping the injection of the denitration agent injection gun numbers corresponding to the first coverage region number and the adjacent region number includes:

[0124] Step 400: When the oxygen concentration change trends of the two regions are both equal to 0, stop the air induction fan group corresponding to the air induction fan group number from working and control the injection gun corresponding to the oxygen injection gun number to inject oxygen.

[0125] When the oxygen concentration change trends of the two regions are both equal to 0, it indicates that the two regions have reacted completely as described in steps 100-106, at least one of the reaction chemical components is missing, so oxygen is injected into the respective regions, i.e., the contents of steps 200-204 are performed.

[0126] Step 401: Before the nitrogen-containing substance concentration trends of the two regions are both equal to 0, determine the region number corresponding to the first coverage region number and the adjacent region number, which reaches 0 first, define the region number as the first region number, and define the region number that has not reached 0 as the second region number.

[0127] Before the nitrogen concentration trend is equal to 0, although the two are mixed, they may not be equal to 0 at the same time due to some unexpected factors, so there is a before-and-after relationship.

[0128] Step 402: Control one of the induced draft fans corresponding to the number of the induced draft fan to introduce the air in the first coverage area number into the area corresponding to the second area number.

[0129] Since the reaction process cannot proceed exactly until all components are fully reacted, and since completion is determined by introducing oxygen, oxygen is generally in excess. Therefore, when the nitrogen concentration trend in the region corresponding to the first region number is equal to 0, the oxygen content in that region is in excess. Furthermore, due to the sequential relationship within step 401, the previously reached interior still contains excess oxygen, which can be introduced into the subsequently reached regions to allow for full utilization of the oxygen.

[0130] Step 403: When the nitrogen concentration trend is equal to 0, stop the induced draft fan corresponding to the fan number and control the spray gun corresponding to the oxygen spray gun number to stop spraying.

[0131] Reference Figure 7 The methods for controlling the denitrification agent spray gun corresponding to the number of the denitrification agent spray gun to stop spraying and controlling the oxygen spray gun corresponding to the number of the oxygen spray gun to stop spraying when the nitrogen concentration trend is equal to 0 include:

[0132] Step 500: Determine the amino concentration based on the nitrogen concentration trend.

[0133] The amino concentration is the concentration of amino groups, represented as NH3. Since oxygen is in excess, when the concentration of nitrogenous compounds tends to 0, the nitrogen oxides have already reacted completely, so the concentration at this point must be that of amino groups. Because the concentration of nitrogenous compounds tends to 0, the value represented by the horizontal line can almost be expressed as the amino concentration.

[0134] Step 501: Obtain the current furnace temperature when the amino concentration is greater than the preset critical concentration.

[0135] The critical concentration is the concentration at a critical value. This can be the concentration of nitrogen oxides that does not react due to excessively low levels, or the concentration of nitrogen oxides that meets the standard, plus the concentration of ammonia that will not cause pollution or irritating odors. When the concentration exceeds the critical concentration, the nitrogen oxide concentration will inevitably be low, indicating a high ammonia concentration, which will lead to excessive ammonia emission and environmental pollution. The current furnace temperature is the temperature inside the furnace. Because the process CO(NH2)2 + H2O(gas) → 2NH3 + CO2↑ involves a reverse reaction, the temperature needs to be controlled within a suitable range, for example, between 780 and 900 degrees Celsius.

[0136] Step 502: Determine the temperature difference to be reduced based on the current furnace temperature and the preset reverse reaction temperature.

[0137] The reverse reaction temperature is the temperature of the reverse reaction. The temperature difference to be reduced is the temperature difference required to be reduced from the current furnace temperature to the reverse reaction temperature. The calculation method is to subtract the reverse reaction temperature from the current furnace temperature.

[0138] Step 503: Calculate the water vapor temperature based on the preset excess weight, amino concentration and temperature difference to be reduced.

[0139] The excess weight is the weight of the excess water vapor to dissolve the amino and carbon dioxide in the gaseous water. The method of confirmation here can be the calculation method, that is, first calculate the density of the furnace air with the amino concentration, then multiply the current furnace temperature, and then divide by the excess weight.

[0140] Step 504: Control the denitration agent lance corresponding to the denitration agent lance to spray water vapor corresponding to the water vapor temperature without spraying the high molecular denitration agent, and control the boiler pressure to be the preset reverse reaction pressure, and continuously obtain the amino concentration.

[0141] The reverse reaction pressure is the pressure required for the reverse reaction. At high temperature and high pressure, ammonia and carbon dioxide react in water solution to generate urea, and the temperature here is about 200 degrees Celsius. By controlling the denitration agent lance corresponding to the denitration agent lance to spray water vapor corresponding to the water vapor temperature without spraying the high molecular denitration agent, the ambient temperature of the high molecular denitration agent is reduced to form urea in the furnace, and after the flue gas temperature rises later, the urea can be directly used for reaction.

[0142] Step 505: When the amino concentration is less than the critical concentration, control the denitration agent lance corresponding to the denitration agent lance to stop spraying and control the oxygen lance corresponding to the lance to stop spraying.

[0143] When the concentration is less than the critical concentration, it means that at this time the requirements are met and the discharge can be carried out.

[0144] Reference Figure 8 The method for spraying the high molecular denitration agent by the denitration agent lance corresponding to the denitration agent lance in units of spraying amount comprises:

[0145] Step 600: Determine the temperature difference to be raised based on the current furnace temperature and the preset positive reaction temperature.

[0146] The positive reaction temperature is the temperature of the reaction of the amino and nitrogen oxide after the reaction of the high molecular denitration agent into the amino and carbon dioxide. The temperature difference to be raised is the temperature required to be raised from the current furnace temperature to the positive reaction temperature.

[0147] Step 601: Calculate the water vapor amount according to the unit injection amount and the preset positive reaction ratio when the temperature difference is greater than 0.

[0148] The positive reaction ratio is the ratio of the amount of denitration agent and the amount of water required for the decomposition of the high molecular denitration agent. The water vapor amount is the amount of water vapor that can decompose the high molecular denitration agent. The calculation method is to multiply the unit injection amount by the positive reaction ratio.

[0149] Step 602: Determine the water vapor temperature according to the water vapor amount, the temperature difference, and the area size corresponding to the area number.

[0150] The water vapor temperature is the temperature required for the water vapor. The conservation equation here is that the water vapor temperature multiplied by the water vapor amount multiplied by the weight of the water vapor, the current furnace temperature multiplied by the volume of the covered area, is equal to the volume of the covered area multiplied by the positive reaction temperature. And the volume of the covered area multiplied by the positive reaction temperature minus the current furnace temperature multiplied by the volume of the covered area is equal to the volume of the covered area multiplied by the temperature difference, so the water vapor temperature multiplied by the water vapor amount multiplied by the weight of the water vapor is equal to the volume of the covered area multiplied by the temperature difference.

[0151] Step 603: Mix the high molecular denitration agent corresponding to the unit injection amount and the water vapor amount at the water vapor temperature, and then inject it by the denitration agent lance corresponding to the denitration agent lance number.

[0152] Reference Figure 9 The method of injecting by the denitration agent lance corresponding to the denitration agent lance number includes:

[0153] Step 700: Obtain the flue gas propagation direction and propagation speed in the furnace.

[0154] The flue gas propagation direction is the direction of the propagation of the flue gas in the furnace. The propagation speed is the overall speed of the flue gas propagation. As shown in Figure 2 The flue gas in the furnace needs to move as a whole, but will have a certain residence at the intermediate position to allow the high molecular denitration agent to fully react, of course, it can also be denitration while flowing.

[0155] Step 701: Find the corresponding full reaction time from the preset time database according to the oxygen concentration change trend.

[0156] The full reaction time is the time from the beginning to the end of the oxygen concentration change trend. The database stores the mapping relationship between the oxygen concentration change trend and the full reaction time, which is recorded by workers in the field after numerous experiments, for example: observe the reaction time when the oxygen concentration change trend remains unchanged under different oxygen concentration change trends. When the system receives the corresponding oxygen concentration change trend, it automatically finds the corresponding full reaction time from the database and outputs it.

[0157] Step 702: determining a reaction distance based on the propagation speed and the sufficient reaction time.

[0158] The reaction distance is the distance moved after the sufficient reaction time in the propagation process. The calculation method is the propagation speed multiplied by the sufficient reaction time.

[0159] Step 703: calculating a sprint distance according to the reaction distance, a preset exit position and a lance position.

[0160] The exit position is the position going out of the furnace, such as Figure 2 shown in the figure, the smoke gas enters the next station from the furnace. The sprint distance is the distance of movement needed from the lance to the starting position of the reaction. Here, since the smoke gas moves along the furnace, it is necessary to move from the lance position to the starting position of the reaction, so as to ensure that the reaction has been completed before flowing out of the exit. The calculation method is to add the reaction distance to the actual starting position of the reaction of the exit position, and then subtract the lance position.

[0161] Step 704: when the sprint distance is greater than 0, calculating a vertical injection direction based on the sprint distance and the lance position.

[0162] When it is greater than 0, it means that the lance position has not been passed, and the lance needs to be injected towards the reaction position so that the polymer denitration agent moves to the starting position. Since the entire area is covered with smoke gas, but the center of the area is taken as the standard, the lance has a certain direction, and here the calculation method is to calculate the diagonal of the sprint distance with the horizontal distance of the center of the covered area towards the lance as the two right-angle sides.

[0163] Step 705: injecting the denitration agent lance corresponding to the denitration agent lance number in the direction of the vertical injection direction.

[0164] Step 706: when the sprint distance is less than 0, injecting the denitration agent lance corresponding to the denitration agent lance number in the direction of the preset flush injection direction.

[0165] The flush injection direction is the direction of the lance directly facing the covered area. When it is less than 0, it means that the injection from the lance position can also completely react before the exit position, so the flush injection direction can be used for injection.

[0166] Based on the same inventive concept, the embodiment of the present application provides a flue gas dry denitration feeding system.

[0167] Referring to Figure 10 , a flue gas dry denitration feeding system comprises:

[0168] An acquisition module is configured to acquire oxygen concentration detector numbers, oxygen concentrations, current furnace temperatures, furnace flue gas propagation directions and propagation speeds.

[0169] a memory for storing a program of a control method of a flue gas dry desulfurization feeding method;

[0170] a processor, the program in the memory can be loaded and executed by the processor to implement a control method of a flue gas dry desulfurization feeding method.

[0171] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above functional modules is exemplified, and in actual application, the above functions can be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. The specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

[0172] The embodiment of the present application provides a computer readable storage medium, which stores a computer program capable of being loaded and executed by a processor to implement a flue gas dry desulfurization feeding method.

[0173] The computer storage medium includes, for example, a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk and various media capable of storing program codes.

[0174] Based on the same inventive concept, the embodiment of the present application provides an intelligent terminal, which comprises a memory and a processor, and the memory stores a computer program capable of being loaded and executed by the processor to implement a flue gas dry desulfurization feeding method.

[0175] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, and any feature disclosed in the specification (including the abstract and the drawings) can be replaced by other equivalent or similar purpose replacement features, unless specifically described. That is, unless specifically described, each feature is only an example of a series of equivalent or similar features.

Claims

1. A method for feeding a flue gas dry desulfurization, characterized by, The method comprises the following steps: acquiring oxygen concentration detector number and corresponding oxygen concentration; finding corresponding coverage area number from preset position database according to oxygen concentration detector number; finding corresponding denitration agent spray gun number from preset spray gun database according to coverage area number; spraying high molecular denitration agent in the denitration agent spray gun corresponding to the denitration agent spray gun number according to preset test spraying amount, and determining oxygen concentration variation trend according to oxygen concentration; finding corresponding unit spraying amount from preset reaction database according to oxygen concentration and oxygen concentration variation trend; spraying high molecular denitration agent in the denitration agent spray gun corresponding to the denitration agent spray gun number according to unit spraying amount, and continuing to analyze oxygen concentration variation trend; stopping spraying in the denitration agent spray gun corresponding to the denitration agent spray gun number when oxygen concentration variation trend is equal to 0.

2. The flue gas dry desulfurization feeding method according to claim 1, characterized by, The method for stopping spraying in the denitration agent spray gun corresponding to the denitration agent spray gun number when oxygen concentration variation trend is equal to 0 comprises the following steps: finding corresponding nitrogen oxide detector number from position database according to coverage area number in reverse; finding corresponding oxygen spray gun number from spray gun database based on denitration agent spray gun number when oxygen concentration variation trend is equal to 0; stopping spraying in the denitration agent spray gun corresponding to the denitration agent spray gun number, and spraying preset test amount of oxygen in the spray gun corresponding to the oxygen spray gun number to acquire nitrogen-containing substance concentration trend on the nitrogen oxide detector number; continuing to spray preset test amount of oxygen in the spray gun corresponding to the oxygen spray gun number when nitrogen-containing substance concentration trend changes, and continuing to acquire nitrogen-containing substance concentration trend on the nitrogen oxide detector number; stopping spraying in the denitration agent spray gun corresponding to the denitration agent spray gun number and stopping spraying in the spray gun corresponding to the oxygen spray gun number when nitrogen-containing substance concentration trend is equal to 0.

3. The flue gas dry desulfurization feeding method according to claim 2, characterized by, The method for stopping spraying in the denitration agent spray gun corresponding to the denitration agent spray gun number and stopping spraying in the spray gun corresponding to the oxygen spray gun number when nitrogen-containing substance concentration trend is equal to 0 comprises the following steps: defining the coverage area number with first oxygen concentration variation trend equal to 0 and nitrogen-containing substance concentration trend equal to 0 as first coverage area number; determining adjacent region number with first oxygen concentration variation trend equal to 0 based on the first coverage area number when oxygen concentration variation trend equal to 0 and nitrogen-containing substance concentration trend equal to 0 appear in the region corresponding to the first coverage area number, and defining the region number as adjacent region number; finding corresponding air blower set number from preset guide database according to the first coverage area number and the adjacent region number when oxygen concentration variation trend is not equal to 0; controlling the air blower set corresponding to the air blower set number to introduce air in the region corresponding to the first coverage area number into the region corresponding to the adjacent region number, and to introduce air in the region corresponding to the adjacent region number into the region corresponding to the first coverage area number, and re-spraying high molecular denitration agent in the denitration agent spray gun corresponding to the first coverage area number and the adjacent region number in the corresponding regions respectively; The first coverage area number and the adjacent area number corresponding to the denitration agent spray gun number are stopped from spraying when the oxygen concentration change trend of both is equal to 0 and the nitrogen-containing substance concentration trend is equal to 0, and the adjacent area number is updated to the first coverage area number and the adjacent area number is re-determined.

4. The flue gas dry desulfurization feeding method according to claim 3, characterized by, The method for stopping the denitration agent spray gun number corresponding to the first coverage area number and the adjacent area number from spraying when the oxygen concentration change trend of both is equal to 0 and the nitrogen-containing substance concentration trend is equal to 0 comprises: The induced draft fan set number corresponding to the induced draft fan set is stopped from working and the oxygen gas spray gun number corresponding to each of the induced draft fan set is controlled to spray oxygen gas when the oxygen concentration change trend of both is equal to 0; The first coverage area number and the adjacent area number corresponding to the denitration agent spray gun number are stopped from spraying when the oxygen concentration change trend of both is equal to 0 and the nitrogen-containing substance concentration trend is equal to 0, and the adjacent area number is updated to the first coverage area number and the adjacent area number is re-determined. The induced draft fan number corresponding to one of the induced draft fans is controlled to introduce air in the first coverage area number into the area corresponding to the second area number; The induced draft fan number corresponding to one of the induced draft fans is controlled to introduce air in the first coverage area number into the area corresponding to the second area number; 5. The method for feeding according to claim 2, wherein The method for stopping the denitration agent spray gun number corresponding to the first coverage area number and the adjacent area number from spraying when the oxygen concentration change trend of both is equal to 0 and the nitrogen-containing substance concentration trend is equal to 0 comprises: The amino group concentration is determined based on the nitrogen-containing substance concentration trend; The current furnace temperature is obtained when the amino group concentration is greater than a preset critical concentration; The temperature difference is determined to be reduced based on the current furnace temperature and a preset reverse reaction temperature; The steam temperature is calculated based on the preset excess weight, the amino group concentration and the reduced temperature difference; The denitration agent spray gun number corresponding to the denitration agent spray gun is controlled to spray steam at the steam temperature without spraying the polymer denitration agent, the boiler pressure is controlled to be a preset reverse reaction pressure, and the amino group concentration is continuously obtained; The denitration agent spray gun number corresponding to the denitration agent spray gun is stopped from spraying and the oxygen gas spray gun number corresponding to the spray gun is stopped from spraying when the amino group concentration is less than the critical concentration.

6. The method for feeding according to claim 5, wherein, The method for spraying the polymer denitration agent by the denitration agent spray gun number corresponding to the denitration agent spray gun in unit injection amount comprises: The temperature difference is determined to be increased based on the current furnace temperature and a preset positive reaction temperature; The steam amount is calculated based on the unit injection amount and a preset positive reaction ratio when the increased temperature difference is greater than 0; The steam temperature is determined based on the steam amount, the increased temperature difference and the area size corresponding to the coverage area number; The polymer denitration agent corresponding to the unit injection amount and the steam amount at the steam temperature are mixed and sprayed by the denitration agent spray gun number corresponding to the denitration agent spray gun.

7. The method for feeding according to claim 6, wherein The method for spraying by the denitration agent spray gun number corresponding to the denitration agent spray gun comprises: The furnace flue gas propagation direction and propagation speed are obtained; The sufficient reaction time corresponding to the oxygen concentration change trend is found in a preset time database; The reaction distance is determined based on the propagation speed and the sufficient reaction time; The sprint distance is calculated based on the reaction distance, a preset outlet position and a spray gun position; and The denitration agent spray gun number corresponding to the denitration agent spray gun is controlled to spray steam at the steam temperature without spraying the polymer denitration agent, the boiler pressure is controlled to be a preset reverse reaction pressure, and the amino group concentration is continuously obtained. calculating a vertical injection direction based on the sprint distance and the lance position when the sprint distance is greater than 0; injecting the denitration agent lance corresponding to the denitration agent lance number in the direction of the vertical injection direction; injecting the denitration agent lance corresponding to the denitration agent lance number in the direction of the preset flush injection direction when the sprint distance is less than 0.

8. A flue gas dry desulfurization feeding system, characterized by, It comprises: an acquisition module for acquiring oxygen concentration detector number, oxygen concentration, current furnace temperature, flue gas propagation direction and propagation speed; a memory for storing the program of the control method of the flue gas dry denitration feeding method according to any one of claims 1 to 7; a processor, the program in the memory can be loaded and executed by the processor, and the control method of the flue gas dry denitration feeding method according to any one of claims 1 to 7 is realized.

9. An intelligent terminal, characterized by It comprises a memory and a processor, and the memory stores the computer program capable of being loaded and executed by the processor to realize the flue gas dry denitration feeding method according to any one of claims 1 to 7.

10. A computer readable storage medium, characterized in that, It stores the computer program capable of being loaded and executed by the processor to realize the flue gas dry denitration feeding method according to any one of claims 1 to 7.

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