SCR (Selective Catalytic Reduction) denitration system for alkali recovery boiler flue gas

Abstract

The utility model relates to the technical field of alkali recovery boiler flue gas treatment, and discloses an SCR (Selective Catalytic Reduction) denitration system for alkali recovery boiler flue gas, which comprises a desulfurization device, a dust removal device, a flue gas heating device, an ammonia gas injection device, an SCR reactor and a waste heat recovery device which are connected in sequence. According to the SCR denitration system, the dust removal device and the desulfurization device are additionally arranged, so that particulate matters such as dust and alkali ash in the flue gas of the alkali recovery boiler and harmful substances possibly influencing the denitration reaction are removed, the purity of the flue gas entering the SCR reactor is ensured to meet the requirement of the denitration reaction, the denitration efficiency is high, and the denitration effect is good. And meanwhile, a waste heat recovery device is additionally arranged subsequently, so that the comprehensive utilization rate of energy sources is improved, and the energy consumption of the whole system is reduced.

Description

Technical Field

[0001] This utility model relates to the field of flue gas treatment technology for alkali recovery boilers, and specifically to an SCR denitrification system for flue gas from alkali recovery boilers. Background Technology

[0002] With increasingly stringent environmental protection requirements, reducing nitrogen oxide emissions has become a crucial issue in boiler operation. Due to their inherent structure and operating characteristics, conventional SCR denitrification processes cannot operate normally in alkali recovery boilers. Risks include catalyst deactivation, unstable denitrification efficiency, high system energy consumption, and equipment corrosion. Therefore, a low-temperature SCR denitrification system specifically designed for alkali recovery boilers is needed to effectively address these problems. Utility Model Content

[0003] The purpose of this invention is to overcome the problem that existing SCR denitrification processes cannot operate normally when treating flue gas from alkali recovery boilers. It provides an SCR denitrification system for alkali recovery boiler flue gas, which removes particulate matter such as dust and alkali ash, as well as harmful substances that may affect the denitrification reaction, by adding dust removal and desulfurization devices. This ensures that the purity of the flue gas entering the SCR reactor meets the requirements of the denitrification reaction, resulting in high denitrification efficiency and avoiding risks such as easy chemical deactivation of the catalyst and equipment corrosion. Furthermore, a waste heat recovery device is added downstream, improving the comprehensive utilization rate of energy and reducing the overall energy consumption of the system.

[0004] To achieve the above objectives, this utility model provides an SCR denitrification system for alkali recovery boiler flue gas, the SCR denitrification system comprising a desulfurization device, a dust removal device, a flue gas heating device, an ammonia injection device, an SCR reactor, and a waste heat recovery device connected in sequence.

[0005] Preferably, the dust removal device is a bag filter or an electrostatic precipitator.

[0006] Preferably, the flue gas heating device is a steam heat exchanger, a gas heater, or an electric heater.

[0007] Preferably, the ammonia injection device is further connected to a gas supply device;

[0008] The gas supply equipment includes an ammonia source storage device, an ammonia preparation device, and an ammonia-air mixer connected in sequence. The gas supply equipment also includes a dilution fan connected to the ammonia-air mixer.

[0009] The ammonia injection device includes an ammonia injection grid.

[0010] Preferably, the ammonia injection device is connected to an ammonia-air mixer.

[0011] Preferably, the SCR reactor is provided with a flue gas guiding and rectifying device and a catalyst layer, and the catalyst layer is disposed at the outlet end of the flue gas guiding and rectifying device;

[0012] The flue gas guiding and rectifying device includes a flue gas guide plate and a rectifying grid.

[0013] Preferably, the SCR denitrification system further includes a flue gas emission device, which is connected to the waste heat recovery device.

[0014] Preferably, the SCR denitrification system further includes a catalyst regeneration device, which is connected to the flue gas heating device.

[0015] Preferably, the SCR denitrification system further includes a DCS / PLC control system, which is used to monitor and control the electrical devices in the SCR denitrification system.

[0016] Preferably, the electrical equipment includes a desulfurization device, a flue gas heating device, an ammonia injection device, an SCR reactor, and a waste heat recovery device.

[0017] The SCR denitrification system of this invention has the following beneficial effects:

[0018] 1. High-efficiency denitrification: By adopting an optimized system design specifically for the low-temperature flue gas conditions of alkali recovery boilers, the flue gas temperature entering the catalyst is increased by reheating through the flue gas heating device during the start-up and shutdown stages of alkali recovery boilers. This meets the denitrification requirements of alkali recovery boilers under all operating conditions, effectively reducing the nitrogen oxide content in the flue gas emitted by alkali recovery boilers. The denitrification efficiency can reach more than 80%, meeting increasingly stringent environmental emission standards.

[0019] 2. Reduced Energy Consumption: The flue gas heating device in the system can precisely adjust the flue gas heating temperature according to actual operating conditions, avoiding energy waste caused by overheating. At the same time, the waste heat recovery device further improves the comprehensive utilization rate of energy and reduces the energy consumption of the entire system.

[0020] 3. Extend catalyst life: The equipped catalyst regeneration device can regenerate poisoned and deactivated catalysts in a timely manner, restore catalyst activity, greatly extend catalyst life, and reduce catalyst replacement frequency and operating costs.

[0021] 4. Stable operation: The DCS / PLC control system can monitor and adjust the system's operating parameters in real time, ensuring that the system can operate stably under various working conditions. This avoids the decrease in denitrification efficiency and equipment failure caused by parameter fluctuations, thus improving the system's reliability and stability.

[0022] 5. Reduced equipment corrosion: Because the system pre-treats the flue gas (dust removal and desulfurization), harmful substances are removed, reducing the corrosiveness of the flue gas, reducing corrosion damage to equipment, extending equipment service life, and lowering equipment maintenance costs. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the SCR denitrification system for alkali recovery boiler flue gas according to this utility model.

[0024] Explanation of reference numerals in the attached figures

[0025] 1. Alkali recovery boiler; 2. Desulfurization unit; 3. Dust removal unit; 4. Flue gas heating unit; 5. Ammonia injection unit; 6. SCR reactor; 7. Waste heat recovery unit; 8. Flue gas emission unit; 9. DCS / PLC control system; 10. Catalyst regeneration unit; 11. Flue gas guiding and rectifying unit; 12. Catalyst bed; 13. Gas supply equipment. Detailed Implementation

[0026] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0027] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0028] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0029] Furthermore, the technical solutions of the various embodiments provided by this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the protection scope claimed by this utility model.

[0030] Example 1

[0031] like Figure 1The SCR denitrification system shown for alkali recovery boiler flue gas includes a desulfurization device 2, a dust removal device 3, a flue gas heating device 4, an ammonia injection device 5, an SCR reactor 6, and a waste heat recovery device 7 connected in sequence.

[0032] The SCR denitrification system of this invention is connected to the alkali recovery boiler 1. The low-temperature flue gas from the alkali recovery boiler 1 enters the SCR denitrification system of this invention for denitrification treatment.

[0033] Furthermore, the flue gas outlet of the alkali recovery boiler 1 is connected to the desulfurization device 2. The low-temperature flue gas from the alkali recovery boiler 1 enters the desulfurization device 2 through the flue gas outlet for desulfurization to remove acidic gases such as sulfur dioxide. The desulfurization device 2 used can be, but is not limited to, a dry SDS desulfurization device (desulfurizing agent grinding device and desulfurizing agent injection device).

[0034] The low-temperature flue gas after desulfurization by desulfurization device 2 then enters dust removal device 3 for dust removal treatment to remove most of the particulate matter in the desulfurized low-temperature flue gas.

[0035] In a preferred embodiment, the dust removal device 3 may be, but is not limited to, a bag filter or an electrostatic precipitator.

[0036] The desulfurization device 2 and dust removal device 3 in the SCR denitrification system of this invention are actually pretreatment devices for the low-temperature flue gas from the alkali recovery boiler 1. Due to the special composition of the flue gas from the alkali recovery boiler, flue gas that has not undergone desulfurization and dust removal will cause chemical deactivation of the catalyst and alkali ash corrosion when it enters the SCR denitrification reactor, affecting the service life and mechanical strength of the catalyst. Therefore, the alkali recovery boiler must undergo desulfurization and dust removal before low-temperature denitrification. The by-products generated during the desulfurization process can be simultaneously removed by the dust removal device 3. After treatment by the desulfurization device 2 and dust removal device 3, the dust content of the low-temperature flue gas is ≤10mg / Nm³. 3 Sulfur dioxide content ≤35mg / Nm 3 This ensures that the quality of the low-temperature flue gas entering SCR reactor 6 meets the requirements for denitrification reaction.

[0037] In this invention, the low-temperature flue gas after being treated by the dust removal device 3 will then enter the flue gas heating device 4 and be heated to a temperature range suitable for the low-temperature SCR denitrification reaction. Based on the initial temperature of the low-temperature flue gas after desulfurization and the required reaction temperature, the temperature of the low-temperature flue gas after desulfurization is raised to about 180-250°C to obtain heated flue gas, which meets the activity temperature requirements of the low-temperature SCR catalyst in the subsequent denitrification reaction. The heated flue gas is then transported to the ammonia injection device 5.

[0038] In specific implementations, the flue gas heating device 4 used can be, but is not limited to, a steam heat exchanger, a gas heater or an electric heater, or it can be achieved by modifying the tail heating surface, etc. The specific choice can be made according to the actual working conditions and energy supply.

[0039] The ammonia injection device 5 in this invention is used to fully and evenly mix the mixture of ammonia and air with the heated flue gas.

[0040] Furthermore, the ammonia injection device 5 is also connected to a gas supply device 13, which includes an ammonia source storage device, an ammonia preparation device, and an ammonia-air mixer connected in sequence. The gas supply device 13 also includes a dilution fan connected to the ammonia-air mixer. In a preferred embodiment, the ammonia injection device 5 is connected to the ammonia-air mixer.

[0041] The ammonia source storage device is used to store the ammonia source, which can be selected from, but is not limited to, urea, liquid ammonia, and ammonia water. The ammonia preparation device is used to prepare the ammonia source into gaseous ammonia. In order to ensure the safe operation of the system and the denitrification reaction effect, the ammonia in the ammonia preparation device will enter the ammonia-air mixer, where it will be mixed with the air provided by the dilution fan to dilute the concentration of ammonia and obtain a mixed gas of ammonia and air (ammonia concentration not higher than 5%), so as to reduce the concentration of ammonia entering the SCR reactor 6. Then, the mixed gas of ammonia and air will enter the ammonia injection device 5 from the ammonia-air mixer. After being sprayed by the ammonia injection device 5, it will be fully and evenly mixed with the flue gas heated by the flue gas heating device 4 (to provide sufficient reducing agent for the denitrification reaction), and then transported to the SCR reactor 6 for the denitrification reaction.

[0042] Specifically, when the ammonia source is urea, the corresponding ammonia source storage device is a urea storage tank, and the ammonia preparation device is a urea pyrolysis furnace or a urea hydrolyzer; when the ammonia source is liquid ammonia, the corresponding ammonia source storage device is a liquid ammonia storage tank, and the ammonia preparation device is a liquid ammonia evaporator; when the ammonia source is ammonia water, the corresponding ammonia source storage device is an ammonia water storage tank, and the ammonia preparation device is an ammonia water evaporator.

[0043] In a specific implementation, taking ammonia water as the ammonia source as an example, the ammonia water stored in the ammonia water storage tank enters the ammonia water evaporator to evaporate and obtain gaseous ammonia gas. The ammonia gas in the ammonia water evaporator enters the ammonia-air mixer, where it is mixed with the air provided by the dilution fan to dilute the concentration of ammonia gas, resulting in a mixed gas of ammonia gas and air (ammonia gas concentration not higher than 5%). Then, the mixed gas of ammonia gas and air enters the ammonia gas injection device 5 from the ammonia-air mixer. After being sprayed by the ammonia gas injection device 5, it is fully mixed with the flue gas heated by the flue gas heating device 4, and then transported to the SCR reactor 6 for denitrification reaction.

[0044] In a preferred embodiment, the ammonia injection device 5 includes an ammonia injection grid, through which ammonia is mixed with flue gas via nozzles evenly distributed on the grid. The uniformity of the ammonia and flue gas mixture is ensured through CFD numerical simulation-assisted design.

[0045] In a specific embodiment, an ammonia injection device 5 is further installed inside the flue gas duct. The inlet of the flue gas duct is connected to the flue gas heating device 4, and the outlet of the flue gas duct is connected to the SCR reactor 6. The heated flue gas from the flue gas heating device 4 enters the flue gas duct, and the ammonia injection device 5 evenly injects a mixture of ammonia and air into the heated flue gas, so that the heated flue gas and the mixture of ammonia and air are fully mixed and homogeneous to obtain a reaction gas. Then, the reaction gas is transported to the SCR reactor 6 through the outlet of the flue gas duct for denitrification reaction.

[0046] Furthermore, the SCR reactor 6 adopts a modular assembly method in its structural design, which facilitates the installation, replacement and maintenance of the catalyst. The SCR reactor 6 is equipped with a reasonable flue gas guiding and rectifying device 11 and a catalyst layer 12, and the catalyst layer 12 is located at the outlet end of the flue gas guiding and rectifying device 11.

[0047] The 11 pairs of flue gas guiding and rectifying devices can be designed with the assistance of CFD numerical simulation to ensure that the flue gas in the catalyst section is free from deflection, so that the ammonia and flue gas are mixed evenly and evenly distributed, reducing catalyst wear and improving denitrification efficiency and ammonia utilization rate.

[0048] In a specific embodiment of this utility model, the flue gas guiding and rectifying device 11 includes a flue gas guiding plate and a rectifying grid. The rectifying grid is located at the outlet end of the flue gas guiding plate, and the catalyst layer 12 is disposed at the outlet end of the rectifying grid (i.e., the flue gas guiding plate, the rectifying grid, and the catalyst layer 12 are sequentially arranged along the gas direction in the SCR reactor 6). After the ammonia and air mixture is fully and uniformly mixed with the heated flue gas, it enters the SCR reactor 6. After being guided by the flue gas guiding plate, it enters the rectifying grid through the outlet end of the flue gas guiding plate for rectification. After passing through the outlet end of the rectifying grid, the gas can pass uniformly through the catalyst layer 12. At the same time, the ammonia injection device 5 precisely controls the injection amount of ammonia according to the flow rate and nitrogen oxide content of the heated flue gas, so that the ammonia and the heated flue gas are fully mixed on the catalyst surface and a denitrification reaction occurs, thereby improving the denitrification reaction efficiency.

[0049] Under temperature conditions of 180-250℃, the main denitrification reaction equations are as follows:

[0050] NO + NO₂ + 2NH₃ → 2N₂ + 3H₂O

[0051] 4NO + 4NH3 + O2 → 4N2 + 6H2O

[0052] 2NO2 + 4NH3 + O2 → 3N2 + 6H2O

[0053] The above reaction converts nitrogen oxides in flue gas into harmless nitrogen and water, thus meeting emission requirements.

[0054] The catalyst in the catalyst layer 12 of the SCR reactor 6 is a SCR catalyst specifically designed for low-temperature conditions. In order to prevent alkaline corrosion of the SCR reactor 6 body, the SCR reactor 6 is made of composite steel plate.

[0055] After the denitrification reaction, the resulting flue gas contains a large amount of residual heat, with a temperature of 170-240℃. Direct emission would result in heat loss. Therefore, a waste heat recovery device 7 is installed. The flue gas after the reaction enters the waste heat recovery device 7. The waste heat recovery device 7 adopts gas-water heat exchange or air-air heat exchange technology, which can recover and utilize part of the residual heat in the flue gas after the reaction. The recovered waste heat can be used to preheat boiler feedwater or cold air, or other media that need to be heated. The specific choice can be made according to the actual working conditions and energy demand, thereby improving the comprehensive utilization rate of energy and reducing the energy consumption of the entire system.

[0056] In this invention, the SCR denitrification system also includes a flue gas emission device 8, which is connected to a waste heat recovery device 7. The flue gas after the waste heat recovery device 7 recovers waste heat is discharged through the flue gas emission device 8.

[0057] In a specific implementation, the flue gas emission device 8 may be, but is not limited to, a chimney.

[0058] Since the catalyst in the SCR reactor 6 may become poisoned and deactivated after prolonged use, the SCR denitrification system also includes a catalyst regeneration device 10, which is connected to the flue gas heating device 4.

[0059] The catalyst regeneration device 10 can periodically test the activity of the catalyst in the SCR reactor 6. When the catalyst activity drops to a certain level, a suitable regeneration process is selected to regenerate the catalyst according to the poisoning situation. The regeneration method can be hot air furnace heating or electric heating regeneration (because the heating temperature of the flue gas heating device 4 cannot reach the temperature required for catalyst regeneration, the catalyst regeneration device 10 is needed for further heating to ensure the effect of catalyst regeneration). For example, for catalysts whose activity has decreased due to ash accumulation and blockage, hot air purging is used for ash removal and regeneration to restore the catalyst activity, extend the service life of the catalyst, reduce operating costs, and ensure the stability of the denitrification performance of the system. At the same time, the catalyst regeneration device 10 can also be used for system preheating and insulation when the denitrification system is shut down.

[0060] In specific embodiments, the catalyst regeneration device 10 may employ, but is not limited to, a hot blast stove, a steam heat exchanger, an electric heater, etc.

[0061] Furthermore, the SCR denitrification system of this utility model also includes a DCS / PLC control system 9. The DCS / PLC control system 9 is used to monitor and control the operating parameters of the low-temperature SCR denitrification system of the alkali recovery boiler. It is mainly used to monitor and control the operating parameters of the electrical devices in the SCR denitrification system, including the desulfurization device 2, the flue gas heating device 4, the ammonia injection device 5, the SCR reactor 6, and the waste heat recovery device 7.

[0062] In a specific implementation, the DCS / PLC control system 9 is used to monitor in real time the pressure in the desulfurization unit 2, the flue gas temperature in the flue gas heating unit 4, the ammonia flow rate in the ammonia injection unit 5, the catalyst temperature, catalyst bed 12 pressure difference, inlet gas flow rate, and outlet ammonia escape concentration in the SCR reactor 6, and the temperature and inlet / outlet gas concentration in the waste heat recovery unit 7. These real-time monitored operating parameters are transmitted to the central control unit. The central control unit automatically adjusts the operating parameters of the desulfurization unit 2, flue gas heating unit 4, ammonia injection unit 5, SCR reactor 6, and waste heat recovery unit 7 according to the preset control strategy and emission standards, so that the SCR denitrification system is always kept in the optimal operating state, ensuring that the denitrification efficiency and emission indicators meet environmental protection requirements.

[0063] In one specific embodiment, the low-temperature flue gas from the alkali recovery boiler 1 enters the desulfurization unit 2 through the exhaust port for desulfurization to remove acidic gases such as sulfur dioxide. After desulfurization by the desulfurization unit 2, the low-temperature flue gas then enters the dust removal unit 3 for dust removal to remove most of the particulate matter. The low-temperature flue gas after dust removal by the dust removal unit 3 then enters the flue gas heating unit 4 and is heated to approximately 180-250°C to obtain heated flue gas. The heated flue gas is then transported to the flue gas duct through the inlet. The ammonia source stored in the ammonia source storage device enters the ammonia preparation device to prepare gaseous ammonia, which then enters the ammonia-air mixing unit. In the ammonia-air mixer, the ammonia is mixed with air supplied by a dilution fan to dilute the concentration of ammonia, resulting in a mixed gas of ammonia and air (ammonia concentration not exceeding 5%). This ammonia-air mixture then enters the ammonia injection device 5, which uniformly injects the mixture into the heated flue gas, ensuring thorough and uniform mixing to obtain the reaction gas. This reaction gas is then transported to the SCR reactor 6 through the flue gas duct outlet. After being guided by the flue gas guide plate, the reaction gas enters the rectifier grid through the outlet end of the guide plate for rectification. Finally, it passes through the rectifier grid outlet end and is uniformly distributed... Ammonia and heated flue gas are thoroughly mixed on the catalyst surface through catalyst layer 12, resulting in a denitrification reaction. After the denitrification reaction, the resulting flue gas enters waste heat recovery device 7, which recovers and utilizes a portion of the waste heat from the flue gas. The recovered waste heat can be used to preheat boiler feedwater or cold air, or other media requiring heating. The flue gas after waste heat recovery is discharged through flue gas emission device 8. Catalyst regeneration device 10 periodically monitors the activity of the catalyst in SCR reactor 6. When the catalyst activity drops to a certain level, catalyst regeneration device 10 regenerates the catalyst. Simultaneously, DCS / PLC control system 9 monitors the catalyst in real time. The system monitors the pressure in desulfurization unit 2, the flue gas temperature in flue gas heating unit 4, the ammonia flow rate in ammonia injection unit 5, the catalyst temperature, catalyst bed pressure difference, inlet gas flow rate, and outlet ammonia escape concentration in SCR reactor 6, and the temperature and inlet / outlet gas concentration in waste heat recovery unit 7. These real-time monitored operating parameters are transmitted to the central control unit. Based on preset control strategies and emission standards, the central control unit automatically adjusts the operating parameters of desulfurization unit 2, flue gas heating unit 4, ammonia injection unit 5, SCR reactor 6, and waste heat recovery unit 7 to ensure the SCR denitrification system always operates at its optimal state, guaranteeing that denitrification efficiency and emission indicators meet environmental protection requirements.

[0064] The SCR denitrification system for flue gas from alkali recovery boilers provided by this utility model can achieve efficient and stable removal of nitrogen oxides under low-temperature flue gas conditions in alkali recovery boilers, while reducing system energy consumption and equipment corrosion risk, and improving the overall system's operational reliability and economy.

[0065] It should be understood that any parts not described in detail in this specification belong to the prior art.

[0066] The preferred embodiments of this utility model have been described in detail above; however, this utility model is not limited thereto. Within the scope of the technical concept of this utility model, various simple modifications can be made to the technical solution of this utility model, including combining the various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed by this utility model and are all within the protection scope of this utility model.

Claims

1. An SCR denitrification system for alkali recovery boiler flue gas, characterized in that, The SCR denitrification system includes a desulfurization device (2), a dust removal device (3), a flue gas heating device (4), an ammonia injection device (5), an SCR reactor (6), and a waste heat recovery device (7) connected in sequence.

2. The SCR denitrification system according to claim 1, characterized in that, The dust removal device (3) is a bag filter or an electrostatic precipitator.

3. The SCR denitrification system according to claim 1 or 2, characterized in that, The flue gas heating device (4) is a steam heat exchanger, a gas heater or an electric heater.

4. The SCR denitrification system according to claim 1, characterized in that, The ammonia injection device (5) is also connected to a gas supply device (13); The gas supply equipment (13) includes an ammonia source storage device, an ammonia preparation device and an ammonia-air mixer connected in sequence. The gas supply equipment (13) also includes a dilution fan connected to the ammonia-air mixer. The ammonia injection device (5) includes an ammonia injection grid.

5. The SCR denitrification system according to claim 4, characterized in that, The ammonia injection device (5) is connected to the ammonia-air mixer.

6. The SCR denitrification system according to claim 1, characterized in that, The SCR reactor (6) is provided with a flue gas guiding and rectifying device (11) and a catalyst layer (12), and the catalyst layer (12) is located at the outlet end of the flue gas guiding and rectifying device (11). The flue gas guiding and rectifying device (11) includes a flue gas guide plate and a rectifying grid.

7. The SCR denitrification system according to claim 1, characterized in that, The SCR denitrification system also includes a flue gas emission device (8), which is connected to the waste heat recovery device (7).

8. The SCR denitrification system according to claim 1 or 7, characterized in that, The SCR denitrification system also includes a catalyst regeneration device (10), which is connected to the flue gas heating device (4).

9. The SCR denitrification system according to claim 1, characterized in that, The SCR denitrification system also includes a DCS / PLC control system (9), which is used to monitor and control the electrical devices in the SCR denitrification system.

10. The SCR denitrification system according to claim 9, characterized in that, The electrical equipment includes a desulfurization device (2), a flue gas heating device (4), an ammonia injection device (5), an SCR reactor (6), and a waste heat recovery device (7).

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