A denitration ammonia production precision control method and device based on double medium cooperation

Abstract

This invention discloses a precise control method and device for denitrification and ammonia production based on dual-media synergy, relating to the field of air pollution control technology. The method includes: real-time acquisition of the measured concentration and a set target concentration of nitrogen oxides in flue gas through a synergistic control system, calculating the concentration deviation; outputting a first control command based on the concentration deviation to adjust the feed rate of the solid denitrification agent in the dry powder ammonia production unit, which then bears the basic ammonia production load to eliminate the main concentration deviation; extracting the remaining residual component or high-frequency fluctuation component of the concentration deviation to generate a second control command to adjust the injection flow rate of the liquid reducing agent in the solution ammonia production unit, compensating for and fine-tuning the ammonia production; and simultaneously, dynamically optimizing the operating temperature of the pyrolysis furnace based on the total ammonia production load of the two units, achieving energy-saving operation of the system while ensuring denitrification effect. This invention solves the problem of large fluctuations in denitrification efficiency by stabilizing ammonia output and achieving low ammonia escape operation.

Description

Technical Field

[0001] This invention relates to the field of air pollution control technology, and in particular to a precise control method and device for denitrification and ammonia production based on dual-media synergy. Background Technology

[0002] In the field of industrial flue gas treatment, such as coal-fired power generation, steel smelting, and cement production, selective catalytic reduction (SCR) denitrification technology has become the mainstream nitrogen oxide control technology due to its high denitrification efficiency and mature and reliable technology. This process uses ammonia as the core reducing agent, which, under the action of a catalyst, reduces nitrogen oxides in the flue gas into harmless nitrogen and water. The stability of the ammonia supply flow rate, the uniformity of its concentration, and the dynamic response speed directly affect the denitrification efficiency, the ammonia slip level, and the overall economic efficiency of the system.

[0003] Currently, pyrolysis ammonia production technology using solid denitrification agents such as urea and ammonium carbamate as raw materials has advantages over traditional ammonia production methods such as ammonia water evaporation and liquid ammonia vaporization. These advantages include high safety, low storage and transportation costs, rapid reaction start-up, and good low-temperature adaptability, leading to its increasingly widespread application in industrial denitrification scenarios. The conventional implementation method for this technology involves feeding the dry powdered denitrification agent into the pyrolysis furnace via a pneumatic conveying system. The feeding rate is controlled by a rotary feeder (such as a star feeder or screw feeder) to adjust the ammonia production from pyrolysis, thereby matching the amount of reducing agent required for flue gas denitrification.

[0004] In practical engineering applications, existing single-unit dry powder ammonia production systems have significant technical limitations. The rotary feeder's adjustment characteristics are mechanical and stepped, resulting in low control resolution and poor linearity, making it impossible to achieve continuous, smooth, and high-precision control of the feed rate. When flue gas flow and nitrogen oxide concentration fluctuate significantly, the dry powder ammonia production unit struggles to quickly adapt to load changes, easily leading to excessive or insufficient ammonia supply. This, in turn, causes unstable denitrification efficiency, excessive ammonia escape, and air preheater blockage. Furthermore, mechanical adjustment exhibits significant lag, failing to effectively suppress high-frequency, small-amplitude fluctuations, further exacerbating system operational volatility and making overall energy consumption optimization difficult.

[0005] Existing technologies, relying solely on a single dry powder ammonia production route, struggle to simultaneously meet the dual demands of stable base load supply and dynamic, precise regulation. They exhibit significant shortcomings in control accuracy, dynamic response speed, and energy efficiency. Therefore, there is an urgent need for a highly efficient denitrification ammonia production system and control method that combines stable high-load supply with rapid, precise regulation, achieving synergistic control of both media. Summary of the Invention

[0006] The main objective of this invention is to provide a precise control method for denitrification and ammonia production based on dual-media synergy.

[0007] Another objective of this invention is to propose a precise control device for denitrification and ammonia production based on dual-media synergy.

[0008] The third objective of this invention is to provide an electronic device.

[0009] A fourth objective of this invention is to provide a non-transitory computer-readable storage medium.

[0010] To achieve the above objectives, a first aspect of the present invention proposes a precise control method for denitrification and ammonia production based on dual-media synergy, comprising:

[0011] The measured value and the set target value of nitrogen oxide concentration in flue gas are obtained by the collaborative control system, and the concentration deviation between the measured value and the set target value is calculated. Based on the concentration deviation, a first control command is generated and sent to the dry powder ammonia production unit to adjust the feed rate of the solid denitrification agent. The dry powder ammonia production unit then assumes the basic ammonia production load, eliminating the main concentration deviation. Extract the residual concentration deviation or high-frequency fluctuation component that still exists after adjustment by the dry powder ammonia production unit, generate a second control command and output it to the solution ammonia production unit to adjust the injection flow rate of the liquid reducing agent and make compensation and fine adjustment to the basic ammonia production load; Based on the total ammonia production load of the dry powder ammonia production unit and the solution ammonia production unit, the operating temperature parameters of the pyrolysis furnace are dynamically optimized to achieve energy-saving operation of the system.

[0012] Optionally, the measured value and the set target value of nitrogen oxide concentration in flue gas are obtained through a collaborative control system, and the concentration deviation between the measured value and the set target value is calculated, including: The NOx concentration monitor built into the collaborative control system captures the measured value of nitrogen oxide concentration in flue gas in real time. The target value for nitrogen oxide concentration is retrieved from the preset storage in the system by the collaborative control system. The difference between the measured value and the set target value is calculated to form a unified concentration deviation signal.

[0013] Optionally, a first control command is generated based on the concentration deviation and sent to the dry powder ammonia production unit to adjust the feed rate of the solid denitrification agent. The dry powder ammonia production unit then assumes the basic ammonia production load, eliminating the main concentration deviation, including: Based on the concentration deviation, a first control command for regulating the dry powder ammonia production unit is generated through a collaborative control system. The first control command is sent to the dry powder ammonia production unit, which drives the dry powder ammonia production unit to adjust the feeding rate and total amount of solid denitrification agent. The dry powder ammonia production unit undertakes the basic ammonia production load of the system, eliminating the main concentration deviation of nitrogen oxides in the flue gas.

[0014] Optionally, extract residual concentration deviations or high-frequency fluctuations that still exist after adjustment by the dry powder ammonia production unit, including: During the process of adjusting the feed amount of solid denitrifying agent in the dry powder ammonia production unit according to the first control command, the adjustment process and effect are monitored in real time by the collaborative control system, and the nitrogen oxide concentration data of flue gas after adjustment are collected synchronously. The concentration data after coarse adjustment is analyzed by the collaborative control system, and residual components or high-frequency fluctuation components are extracted from the concentration deviation that still exists after adjustment by the dry powder ammonia production unit.

[0015] Optionally, a second control command is generated and output to the solution ammonia production unit to adjust the injection flow rate of the liquid reducing agent and perform fine-tuning of the basic ammonia production load, including: Based on the extracted residual component of concentration deviation or high-frequency fluctuation component, a second control command is generated through a collaborative control system. The second control command is output to the solution ammonia generation unit to drive the solution ammonia generation unit to adjust the injection flow rate of the liquid reducing agent; By adjusting the injection flow rate, the basic ammonia production load of the dry powder ammonia production unit is dynamically compensated and finely adjusted in real time.

[0016] Optionally, the operating temperature parameters of the pyrolysis furnace can be dynamically optimized based on the total ammonia production load of the dry powder ammonia production unit and the solution ammonia production unit, including: The actual ammonia production load data of the dry powder ammonia production unit and the actual compensated ammonia production load data of the solution ammonia production unit are collected through the collaborative control system. The total ammonia production load of the system under the synergistic effect of the two ammonia production sources was calculated by superimposing the collected ammonia production load data from the two sources. Based on the calculated total ammonia production load and combined with the preset energy consumption optimization standards, the operating temperature parameters of the pyrolysis furnace that are compatible with the current total load are determined and sent to the control mechanism of the pyrolysis furnace to drive the pyrolysis furnace to adjust the operating temperature.

[0017] To achieve the above objectives, a second aspect of the present invention provides a precise control device for denitrification and ammonia production based on dual-media synergy, comprising: The deviation calculation module is used to obtain the measured value and the set target value of nitrogen oxide concentration in flue gas through the collaborative control system, and calculate the concentration deviation between the measured value and the set target value. The dry powder adjustment module is used to generate a first control command based on the concentration deviation and send it to the dry powder ammonia production unit to adjust the feed rate of the solid denitrification agent. The dry powder ammonia production unit then undertakes the basic ammonia production load, eliminating the main concentration deviation. The solution fine-tuning module is used to extract the residual component of concentration deviation or high-frequency fluctuation component that still exists after adjustment by the dry powder ammonia production unit, generate a second control command and output it to the solution ammonia production unit to adjust the injection flow rate of the liquid reducing agent and make compensation fine-tuning to the basic ammonia production load. The temperature control and energy-saving module is used to dynamically optimize the operating temperature parameters of the pyrolysis furnace based on the total ammonia production load of the dry powder ammonia production unit and the solution ammonia production unit, so as to achieve energy-saving operation of the system.

[0018] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0019] To achieve the above objectives, a third aspect of this application provides an electronic device, including a processor and a memory; wherein the processor reads executable program code stored in the memory to run a program corresponding to the executable program code, so as to implement a precise control method for denitrification and ammonia production based on dual-media synergy as described in the first aspect embodiment.

[0020] To achieve the above objectives, the fourth aspect of this application proposes a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements a precise control method for denitrification and ammonia production based on dual-media synergy as described in the first aspect embodiment.

[0021] The embodiments of the present invention have the following beneficial effects: 1. Leap in control precision: By using liquid regulating valves (such as metering pumps, solenoid valves, and pneumatic regulating valves), continuous and linear precise control of flow rate at the milliliter level can be achieved, solving the industry problem of difficult precise control of solid flow rate and improving NOx control precision by more than 50%.

[0022] 2. Rapid dynamic response: The solution injection has almost no lag and can respond to control commands instantly. It can quickly offset the instantaneous fluctuations of NOx in flue gas and the inherent pulsations of dry powder conveying, and the system adjustment time is greatly shortened.

[0023] 3. Stable operation and environmental protection: By fine-tuning the solution, the fluctuation of ammonia concentration is controlled within an extremely narrow range, which significantly reduces the risk of ammonia escape and improves the stability of catalyst life and overall denitrification efficiency.

[0024] 4. Significant energy saving and consumption reduction: Dry powder bears the basic load, allowing it to operate in the optimal efficiency range; the temperature of the pyrolysis furnace can be dynamically optimized with the total load, avoiding energy waste under low load; the overall energy consumption can be reduced by 10-20%.

[0025] 5. Economy and reliability: The main path still uses mature dry powder technology with controllable costs; the added solution path has a simple structure and low investment. The combination of the two achieves a "1+1>2" effect, and the system redundancy is also improved. Attached Figure Description

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 A flowchart illustrating a precise control method for denitrification and ammonia production based on dual-media synergy, provided as an embodiment of the present invention; Figure 2 The overall logic framework diagram of a precise control method for denitrification and ammonia production based on dual-media synergy is provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the dual-medium synergistic ammonia production system provided in an embodiment of the present invention; Figure 4 This is a structural diagram of a precision control device for denitrification and ammonia production based on dual-media synergy, provided in an embodiment of the present invention. Detailed Implementation

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0029] The following describes, with reference to the accompanying drawings, a method and apparatus for precise control of denitrification and ammonia production based on dual-media synergy, according to an embodiment of the present invention.

[0030] Example 1 This invention provides a precise control method for denitrification and ammonia production based on dual-media synergy. Figure 1 This is a schematic flowchart illustrating a precise control method for denitrification and ammonia production based on dual-media synergy, provided in an embodiment of the present invention. Figure 1 As shown, the method includes the following steps: Step S1: Obtain the measured value and the set target value of nitrogen oxide concentration in flue gas through the collaborative control system, and calculate the concentration deviation between the measured value and the set target value.

[0031] In the embodiments of this application, such as Figure 2 As shown, the collaborative control system, as the core of the overall control, continuously collects the set value and real-time detection value of NOx concentration in flue gas, and compares and calculates the two sets of data through the deviation calculation unit to form a unified deviation signal, which provides the basic input for subsequent dual-loop collaborative control.

[0032] In this embodiment, a NOx concentration monitor, specifically configured with a collaborative control system, continuously monitors the concentration of nitrogen oxides in the flue gas online to obtain measured concentration values. Simultaneously, it retrieves the pre-set NOx concentration control target value from within the controller. The controller calculates the difference between the measured value and the set value to obtain the real-time concentration deviation signal, and the relationship can be expressed as follows:

[0033] Where e(t) represents the concentration deviation signal.

[0034] The deviation signal e(t) can accurately reflect the degree of deviation between the current flue gas NOx concentration and the control target, providing a key control basis for the coarse adjustment control of the dry powder ammonia production unit and the fine compensation of the solution ammonia production unit in the embodiments of this application, so that the adjustment process of the entire system has a clear signal basis.

[0035] Step S2: Based on the concentration deviation, a first control command is generated and sent to the dry powder ammonia production unit to adjust the feed rate of the solid denitrification agent. The dry powder ammonia production unit then assumes the basic ammonia production load, eliminating the main concentration deviation.

[0036] In the embodiments of this application, such as Figure 2 As shown, the original deviation signal e(t) calculated in S1 is not directly used to drive the dry powder ammonia production unit. Instead, it is first sent to the signal processor built into the collaborative control system, where the signal processor separates and processes the deviation signal.

[0037] In this embodiment, the signal processor is equipped with a low-pass filter, the core function of which is to separate the low-frequency component in the concentration deviation signal e(t). This effectively filters out high-frequency, small-amplitude fluctuations in the deviation signal, retaining only the low-frequency component that reflects the trend of NOx concentration changes in flue gas. Subsequently, this low-frequency component... The data is transmitted via the To_drypowder module to the dry powder loop PI controller in the advanced cooperative logic, providing precise input for the generation of the first control command.

[0038] In this embodiment, the dry powder loop PI controller is based on the received low-frequency components. The first control command is generated according to the preset control algorithm. This command is specifically the rotation speed command of the rotary feeder. Its control algorithm can be simplified as follows:

[0039] in, This is the proportional coefficient for the dry powder circuit, used to adjust the response sensitivity of control commands; This is the integral coefficient of the dry powder circuit, used to eliminate the steady-state deviation of the system; This serves as the reference output value for the dry powder circuit, ensuring that the dry powder ammonia production unit can maintain a minimum stable operating load.

[0040] Generated speed command The data is sent in real-time to the rotary feeder, the actuator of the dry powder ammonia production unit. By adjusting the rotation speed of the rotary feeder, the feeding rate and total amount of solid denitrification agent are precisely controlled, achieving a quantitative supply of solid denitrification agent. In this embodiment, the dry powder ammonia production unit bears the basic ammonia production load of the system, accounting for more than 90% of the total ammonia production of the system, and is the core of the stable operation of the entire denitrification and ammonia production system. The quantitatively supplied solid denitrification agent is transported to the pyrolysis furnace via a pneumatic conveying device, where it completes the pyrolysis reaction to generate ammonia gas. Through a stable and sufficient supply of ammonia gas, the main deviation in the concentration of nitrogen oxides in the flue gas is effectively eliminated, laying a solid foundation for the stable operation of the entire denitrification system.

[0041] Step S3: Extract the residual concentration deviation or high-frequency fluctuation component that still exists after adjustment by the dry powder ammonia production unit, generate a second control command and output it to the solution ammonia production unit to adjust the injection flow rate of the liquid reducing agent and make compensation and fine adjustment to the basic ammonia production load.

[0042] In the embodiments of this application, such as Figure 2 As shown, to achieve precise fine-tuning, the original deviation signal e(t) is not only sent to the low-pass filter, but also simultaneously enters the high-pass filter built into the signal processor. This high-pass filter works in conjunction with the low-pass filter to separate and extract the high-frequency fluctuation component in the concentration deviation signal e(t). It effectively captures high-frequency, small-amplitude concentration fluctuations that the coarse adjustment circuit of the dry powder ammonia production unit cannot respond to or suppress.

[0043] In this embodiment of the application, the high-frequency components extracted by the high-pass filter The signal is transmitted via the To_solution module to the solution loop PI / PI controller in the advanced cooperative logic. This controller, as the core control component of the solution ammonia production unit, is specifically responsible for processing high-frequency fluctuation signals and generating precise fine-tuning control commands. The solution loop PI / PI controller is based on the received high-frequency components. The system generates a second control command according to a preset control algorithm. This command is specifically the opening command of the precision regulating valve. Its control algorithm can be simplified as follows:

[0044] in, The proportionality coefficient of the solution circuit. The integral coefficient of the solution circuit is set to ensure that the response speed of the solution ammonia generation unit can match the adjustment requirements of high-frequency fluctuations. This is specifically set in the embodiments of this application. > This makes the response speed of the solution circuit significantly higher than that of the coarse adjustment control circuit of the dry powder ammonia production unit, thereby achieving rapid response and precise compensation for high-frequency fluctuations.

[0045] Generated opening instructions The data is sent in real-time to the actuator of the solution ammonia generation unit—the precision regulating valve. By adjusting the opening of the precision regulating valve, the injection flow rate of the liquid reducing agent (such as urea solution or ammonia water) is precisely controlled, thereby regulating the ammonia production of the solution ammonia generation unit. In this embodiment, the solution ammonia generation unit only undertakes the auxiliary compensation load of the system, and its ammonia production accounts for less than 10% of the total ammonia production of the system. Its core function is to compensate for the adjustment shortcomings of the coarse adjustment loop of the dry powder ammonia generation unit. Through the rapid action of the precision regulating valve, the basic ammonia production load of the dry powder ammonia generation unit is dynamically compensated and finely adjusted in real time, quickly suppressing the high-frequency, small-amplitude concentration fluctuations that the dry powder loop cannot overcome, further reducing the deviation between the flue gas NOx concentration and the set target value, and improving the control accuracy of the entire denitrification ammonia generation system.

[0046] Meanwhile, in this embodiment, to avoid the problem of saturation failure of the solution adjustment unit and the inability to achieve fine-tuning function, a valve position monitoring logic is specially set up. This logic collects the valve position signal of the precision control valve in real time. The valve position status is continuously monitored. When the valve position of the precision control valve is detected to be continuously out of range, i.e. >95% (valve fully open) or When the value is less than 5% (valve fully closed), the anti-saturation reset logic will be immediately triggered to adjust the reference output value of the dry powder ammonia production unit. By adjusting the reference value of the dry powder circuit, the valve position of the precision regulating valve is brought back to a reasonable adjustment range, preventing the solution regulating unit from losing its fine-tuning capability due to saturation. If the valve position is not detected to be in an over-limit state, the current control parameters and operating status will be maintained to ensure the stability and continuity of the dual-media coordinated control and guarantee the long-term stable operation of the entire denitrification ammonia production system.

[0047] Step S4: Based on the total ammonia production load of the dry powder ammonia production unit and the solution ammonia production unit, dynamically optimize and set the operating temperature parameters of the pyrolysis furnace to achieve energy-saving operation of the system.

[0048] In this embodiment, to achieve energy-efficient operation of the entire denitrification ammonia production system, the coordinated control system dynamically optimizes the operating temperature parameters of the pyrolysis furnace based on the real-time ammonia production load of the dry powder ammonia production unit and the solution ammonia production unit, balancing pyrolysis efficiency and energy consumption control to achieve a dynamic equilibrium between the two. Unlike the traditional fixed temperature control mode, this embodiment adopts an optimized control method that links load and temperature, ensuring that the operating state of the pyrolysis furnace is always adapted to the total ammonia production load of the system. This avoids energy waste at low loads while guaranteeing the pyrolysis effect at high loads.

[0049] In this embodiment, the collaborative control system collects two ammonia production load data in real time: one is the actual ammonia production load of the dry powder ammonia production unit. This load is controlled by the rotational speed command of the dry powder circuit. The decision reflects the actual ammonia production from the pyrolysis of solid denitrification agents; on the other hand, it collects the actual compensated ammonia production load of the solution ammonia production unit. This load is determined by the opening command of the solution circuit. The decision reflects the actual ammonia production from the pyrolysis of the liquid reducing agent. Subsequently, the collaborative control system, through its internal load calculation module, superimposes the ammonia production load data from the two sources to accurately calculate the total ammonia production load of the system under the synergistic effect of the two media. The calculation formula is as follows:

[0050] in, The total ammonia production load of the system directly reflects the current denitrification demand and operating load level of the system.

[0051] Based on the calculated total ammonia production load The collaborative control system, in conjunction with preset energy consumption optimization standards, comprehensively considers pyrolysis efficiency and energy consumption to determine the pyrolysis furnace operating temperature parameters suitable for the current total load. The core of the preset energy consumption optimization standards is to minimize the energy consumption of the pyrolysis furnace while ensuring complete pyrolysis of the denitrification agent and without affecting the denitrification effect, thus achieving a balance between energy consumption and efficiency. After determining the suitable temperature parameters, the collaborative control system sends the temperature command to the pyrolysis furnace's control mechanism in real time, driving the pyrolysis furnace to quickly adjust its operating temperature, achieving synchronous linkage between temperature and total ammonia production load.

[0052] Specifically, under low-load conditions, i.e., the total ammonia production load of the system... At lower temperatures, the embodiments of this application appropriately reduce the temperature setpoint of the pyrolysis furnace. In this case, the supply of solid denitrifying agent and liquid reducing agent is less, and a lower pyrolysis temperature is sufficient to meet their full pyrolysis requirements, eliminating the need to maintain a higher temperature. This effectively reduces the energy consumption of the pyrolysis furnace, achieving the goal of energy saving and consumption reduction, while avoiding unnecessary energy waste.

[0053] Under high load conditions, i.e., the total ammonia production load of the system... When the temperature is high, the embodiment of this application will correspondingly increase the temperature setpoint of the pyrolysis furnace. At this time, the supply of solid denitrification agent and liquid reducing agent increases significantly. Increasing the pyrolysis temperature can ensure that a large amount of denitrification agent is fully pyrolyzed and completely converted into ammonia gas, avoiding a decrease in denitrification efficiency due to insufficient pyrolysis. At the same time, it can also prevent the residual denitrification agent that has not been fully pyrolyzed from affecting the system operation, thereby ensuring the treatment effect of the entire denitrification and ammonia production system and achieving efficient, stable and energy-saving operation of the system.

[0054] In the application of one embodiment of the present invention, the implementation process is as follows: In this embodiment of the dual-media synergistic denitrification and ammonia production system, the dry powder used is ammonium carbamate powder, and the solution used is a 40wt% urea solution, as detailed below: I. System device operation process.

[0055] like Figure 3 As shown, the dry powder ammonia production unit consists of a silo, a buffer tank, a spray tank, and a variable frequency rotary feeder, with compressed air as the conveying power. Ammonium carbamate powder is first stored in the silo, then enters the spray tank through the buffer tank, and is then precisely metered by the rotary feeder. Under the influence of compressed air, it is sent through pipelines to the pyrolysis furnace, where it is pyrolyzed to generate ammonia gas.

[0056] The solution-based ammonia production unit consists of a urea solution storage tank, a transfer pump, and multiple sets of high-precision pneumatic diaphragm regulating valves (accuracy ≤1%FS). The storage tank is equipped with high and low liquid level monitoring points and an ammonia concentration monitor, and is also connected to a demineralized water inlet to maintain a stable solution concentration. After being pressurized by the transfer pump, the urea solution is atomized and sprayed into the pyrolysis furnace through precision regulating valves, where it mixes with the dry powder pyrolysis gas and participates in the denitrification reaction. The system controller uses a DCS or PLC to achieve coordinated control of the dry powder and solution units.

[0057] II. Control Strategy Implementation Process.

[0058] 1. Deviation calculation.

[0059] The controller collects real-time NOx concentration data in the flue gas using an online NOx concentration monitoring instrument located in the SCR inlet flue, with a data acquisition cycle of 1 second. At the same time, it retrieves the NOx concentration target value stored internally in the controller. The real-time concentration deviation is calculated using subtraction. The deviation calculation formula is as follows:

[0060] This deviation signal is fed back to the controller's signal processing module in real time, providing a core basis for subsequent graded adjustments.

[0061] 2. Graded regulation.

[0062] When |e(t)|>10mg / N When the NOx concentration is determined to be significantly off, coarse adjustment of the dry powder is initiated: the deviation is low-pass filtered to obtain the low-frequency component. Input the dry powder circuit PI controller to generate the rotary feeder speed command:

[0063] in, This is the proportional coefficient for the dry powder circuit, used to adjust the response sensitivity of control commands; This is the integral coefficient of the dry powder circuit, used to eliminate the steady-state deviation of the system; This is the reference output value for the dry powder circuit.

[0064] By adjusting the speed of the variable frequency motor of the rotary feeder, the feeding rate and total amount of solid denitrification agent are changed, thereby eliminating the main deviation in NOx concentration in flue gas and ensuring the overall denitrification effect of the denitrification system.

[0065] When 1mg / N ≤∣e(t)∣≤10mg / N When the deviation is determined to be at a moderate level, the dry powder circuit maintains its current output and initiates solution fine-tuning: extracting the high-frequency component of the deviation. Input the solution loop PI controller to generate the valve opening command:

[0066] in, The proportionality coefficient of the solution circuit. This is the integral coefficient of the solution circuit, used to ensure that the response speed of the solution ammonia generation unit can match the adjustment requirements of high-frequency fluctuations.

[0067] This application embodiment is specifically set > The solution circuit adjustment cycle is set to 100 milliseconds, which is much faster than the 2-5 seconds of the dry powder circuit. This can quickly smooth out residual high-frequency concentration fluctuations and further reduce NOx concentration deviation.

[0068] When |e(t)| < 5 mg / N If the deviation is small, only the solution circuit is activated for small-amplitude compensation adjustment. The controller continuously extracts the high-frequency component of the deviation and fine-tunes the opening of the precision regulating valve through the PI controller of the solution circuit to stabilize the NOx concentration within the set target value range. This avoids frequent adjustments to the dry powder circuit due to small deviations, reducing system energy consumption and equipment wear.

[0069] 3. Optimization of pyrolysis furnace temperature.

[0070] When the boiler load drops to 50%, the controller collects the actual ammonia production load of the dry powder ammonia production unit in real time. Compensation for ammonia production load in the solution ammonia production unit Calculate the total ammonia production load:

[0071] The temperature of the pyrolysis furnace is dynamically adjusted based on the total load to reduce energy consumption while ensuring the complete pyrolysis of the denitrification agent.

[0072] Under this condition, the operating temperature of the pyrolysis furnace is adjusted from 650℃ to 600℃. This temperature adjustment can ensure the full pyrolysis of urea solution and ammonium carbamate powder without affecting the denitrification and ammonia production effect, and can also significantly reduce the energy consumption of the pyrolysis furnace.

[0073] Under this operating condition, the output of the dry powder ammonia production unit is reduced to 55%, and the opening of the precision regulating valve of the solution ammonia production unit is approximately 8%. Actual operation testing shows that the total system energy consumption is reduced by 15% compared to the same period last year, while the NOx concentration control deviation remains stably maintained at ±3 mg / N. Within this range, the dual goals of precise control of the denitrification system and energy saving and consumption reduction have been achieved.

[0074] Example 2 This invention provides a precise control device for denitrification and ammonia production based on dual-media synergy. Figure 4 This is a schematic diagram of a precision control device for denitrification and ammonia production based on dual-media synergy, provided in an embodiment of the present invention. Figure 4 As shown, the device includes: The deviation calculation module 100 is used to obtain the measured value and the set target value of nitrogen oxide concentration in flue gas through the collaborative control system, and calculate the concentration deviation between the measured value and the set target value. The dry powder adjustment module 200 is used to generate a first control command based on the concentration deviation and send it to the dry powder ammonia production unit to adjust the feed rate of the solid denitrification agent, so that the dry powder ammonia production unit can bear the basic ammonia production load and eliminate the main concentration deviation. The solution fine-tuning module 300 is used to extract the residual component of concentration deviation or high-frequency fluctuation component that still exists after adjustment by the dry powder ammonia production unit, generate a second control command and output it to the solution ammonia production unit to adjust the injection flow rate of the liquid reducing agent and make compensation fine-tuning to the basic ammonia production load. The temperature control and energy-saving module 400 is used to dynamically optimize and set the operating temperature parameters of the pyrolysis furnace based on the total ammonia production load of the dry powder ammonia production unit and the solution ammonia production unit, so as to achieve energy-saving operation of the system.

[0075] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0076] Example 3 To implement the methods of the above embodiments, the present invention also provides an electronic device, which includes a memory and a processor; wherein the processor reads executable program code stored in the memory to run a program corresponding to the executable program code, so as to implement the various steps of the methods described above.

[0077] Example 4 To implement the above embodiments, this application also proposes a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the method described in the foregoing embodiments.

[0078] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0079] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0080] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

Claims

1. A precise control method for denitrification and ammonia production based on dual-media synergy, characterized in that, include: The measured value and the set target value of nitrogen oxide concentration in flue gas are obtained by the collaborative control system, and the concentration deviation between the measured value and the set target value is calculated. Based on the concentration deviation, a first control command is generated and sent to the dry powder ammonia production unit to adjust the feed rate of the solid denitrification agent. The dry powder ammonia production unit then assumes the basic ammonia production load, eliminating the main concentration deviation. Extract the residual concentration deviation or high-frequency fluctuation component that still exists after adjustment by the dry powder ammonia production unit, generate a second control command and output it to the solution ammonia production unit to adjust the injection flow rate of the liquid reducing agent and make compensation and fine adjustment to the basic ammonia production load; Based on the total ammonia production load of the dry powder ammonia production unit and the solution ammonia production unit, the operating temperature parameters of the pyrolysis furnace are dynamically optimized to achieve energy-saving operation of the system.

2. The method according to claim 1, characterized in that, The measured value and the set target value of nitrogen oxide concentration in flue gas are obtained through a collaborative control system. The concentration deviation between the measured value and the set target value is calculated, including: The NOx concentration monitor built into the collaborative control system captures the measured value of nitrogen oxide concentration in flue gas in real time. The target value for nitrogen oxide concentration is retrieved from the preset storage in the system by the collaborative control system. The difference between the measured value and the set target value is calculated to form a unified concentration deviation signal.

3. The method according to claim 2, characterized in that, Based on the concentration deviation, a first control command is generated and sent to the dry powder ammonia production unit to adjust the feed rate of the solid denitrification agent. The dry powder ammonia production unit then assumes the basic ammonia production load, eliminating the main concentration deviation, including: Based on the concentration deviation, a first control command for regulating the dry powder ammonia production unit is generated through a collaborative control system. The first control command is sent to the dry powder ammonia production unit, which drives the dry powder ammonia production unit to adjust the feeding rate and total amount of solid denitrification agent. The dry powder ammonia production unit undertakes the basic ammonia production load of the system, eliminating the main concentration deviation of nitrogen oxides in the flue gas.

4. The method according to claim 3, characterized in that, Extracting residual concentration deviations or high-frequency fluctuations that still exist after adjustment by the dry powder ammonia production unit, including: During the process of adjusting the feed amount of solid denitrifying agent in the dry powder ammonia production unit according to the first control command, the adjustment process and effect are monitored in real time by the collaborative control system, and the nitrogen oxide concentration data of flue gas after adjustment are collected synchronously. The concentration data after coarse adjustment is analyzed by the collaborative control system, and residual components or high-frequency fluctuation components are extracted from the concentration deviation that still exists after adjustment by the dry powder ammonia production unit.

5. The method according to claim 4, characterized in that, The second control command is generated and output to the solution ammonia production unit to adjust the injection flow rate of the liquid reducing agent and to perform fine-tuning of the basic ammonia production load, including: Based on the extracted residual component of concentration deviation or high-frequency fluctuation component, a second control command is generated through a collaborative control system. The second control command is output to the solution ammonia generation unit to drive the solution ammonia generation unit to adjust the injection flow rate of the liquid reducing agent; By adjusting the injection flow rate, the basic ammonia production load of the dry powder ammonia production unit is dynamically compensated and finely adjusted in real time.

6. The method according to claim 5, characterized in that, Based on the total ammonia production load of the dry powder ammonia production unit and the solution ammonia production unit, the operating temperature parameters of the pyrolysis furnace are dynamically optimized, including: The actual ammonia production load data of the dry powder ammonia production unit and the actual compensated ammonia production load data of the solution ammonia production unit are collected through the collaborative control system. The total ammonia production load of the system under the synergistic effect of the two ammonia production sources was calculated by superimposing the collected ammonia production load data from the two sources. Based on the calculated total ammonia production load and combined with the preset energy consumption optimization standards, the operating temperature parameters of the pyrolysis furnace that are compatible with the current total load are determined and sent to the control mechanism of the pyrolysis furnace to drive the pyrolysis furnace to adjust the operating temperature.

7. A precise control device for denitrification and ammonia production based on dual-media synergy, characterized in that, include: The deviation calculation module is used to obtain the measured value and the set target value of nitrogen oxide concentration in flue gas through the collaborative control system, and calculate the concentration deviation between the measured value and the set target value. The dry powder adjustment module is used to generate a first control command based on the concentration deviation and send it to the dry powder ammonia production unit to adjust the feed rate of the solid denitrification agent. The dry powder ammonia production unit then undertakes the basic ammonia production load, eliminating the main concentration deviation. The solution fine-tuning module is used to extract the residual component of concentration deviation or high-frequency fluctuation component that still exists after adjustment by the dry powder ammonia production unit, generate a second control command and output it to the solution ammonia production unit to adjust the injection flow rate of the liquid reducing agent and make compensation fine-tuning to the basic ammonia production load. The temperature control and energy-saving module is used to dynamically optimize the operating temperature parameters of the pyrolysis furnace based on the total ammonia production load of the dry powder ammonia production unit and the solution ammonia production unit, so as to achieve energy-saving operation of the system.

8. The apparatus according to claim 7, characterized in that, The deviation calculation module is also used for: The NOx concentration monitor built into the collaborative control system captures the measured value of nitrogen oxide concentration in flue gas in real time. The target value for nitrogen oxide concentration is retrieved from the preset storage in the system by the collaborative control system. The difference between the measured value and the set target value is calculated to form a unified concentration deviation signal.

9. An electronic device, characterized in that, Including processor and memory; The processor reads executable program code stored in the memory to run a program corresponding to the executable program code, so as to implement the method as described in any one of claims 1-6.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the method as described in any one of claims 1-6.

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