Efficient gas turbine SCR denitration structure and process method

Abstract

The application provides a high-efficiency gas turbine SCR denitration structure and process method x concentration monitor, the SCR denitration outlet NO x concentration monitor, the SCR denitration outlet H2O2 concentration monitor and the boiler load monitor are respectively electrically connected with a controller, the controller is respectively electrically connected with an H2O2 solution metering dispenser and a urea solution metering dispenser, and the controller is used for respectively controlling the H2O2 solution metering dispenser and the urea solution metering dispenser to calculate and distribute the amount of H2O2 and the amount of urea sprayed into the gas turbine outlet, so that the molar ratio of the NO concentration to the NO2 concentration of the flue gas in the SCR denitration reaction process is 1.0-1.1; in this way, the SCR denitration reaction is carried out at a lower temperature, the catalyst usage amount is reduced, full-load denitration is realized, the current gas turbine denitration modification and even the long-term gas turbine full-load denitration have good reference effects, and obvious economic advantages and practical feasibility are achieved.

Description

Technical Field

[0001] This invention relates to the field of SCR denitrification technology for gas turbines, specifically to a highly efficient SCR denitrification structure and process for gas turbines. Background Technology

[0002] In response to national environmental protection policies, NOx emissions from gas turbine flue gas are becoming increasingly stringent. Beijing's "Emission Standard for Air Pollutants from Stationary Gas Turbines" (DB 11 / 847-2011) stipulates that newly built natural gas-fired gas turbine units must meet standards for particulate matter, SO2, and NOx emissions. x The emission limits are 5 mg / m³. 3 20mg / m 3 and 30mg / m 3 The Tianjin Municipal Emission Standard for Air Pollutants from Thermal Power Plants (DB12 / 810-2018) stipulates that existing and newly built gas turbine units using natural gas must meet the following emission standards regarding NOx emissions. X The emission limits are 35 mg / m³. 3 and 30mg / m 3 In April 2018, Shenzhen issued the "2018 Shenzhen Blue Sustainable Action Plan," requiring all gas-fired power plants to achieve NO [missing information - likely referring to a specific emission standard] by November 2018. x All reached 15mg / m 3 The following is a summary of Jiangsu Province's "Emission Standard for Air Pollutants from Stationary Gas Turbines" (DB32 / 3967-2021), which stipulates that the NOx emission limits for existing and newly built natural gas-fired gas turbine units are 30 mg / m³. 3 and 15mg / m 3 .

[0003] Compared to coal-fired units, the NO content in gas turbine flue gas is lower. x The initial concentration is low, the flue gas temperature is low, and the spatial structure is more compact, requiring lower system resistance. Therefore, traditional SCR denitrification cannot be directly applied. Currently, SCR denitrification catalysts suitable for gas turbine units are mainly small-pore, high-specific-surface-area, and highly active porous catalysts. This type of catalyst has high activity and stable denitrification efficiency under stable high-load conditions, but its activity is low during start-up or low-load stages, failing to meet denitrification emission requirements and easily causing new environmental assessments, economic losses, and social image problems.

[0004] Therefore, it is necessary to develop an efficient SCR denitrification process and method for gas turbines to improve the safety, economy and reliability of operation.

[0005] The prior art related to this invention is as follows:

[0006] Chinese patent document CN110508132B discloses a denitrification system and method for high-efficiency SCR denitrification of gas turbine units. By installing a urea solution spray gun inside the gas turbine outlet flue, urea is pyrolyzed and mixed with the flue gas. An anti-swirl device is used to enhance the mixing of flue gas and ammonia and maintain a stable flow direction, thereby improving the uniformity of the ammonia-nitrogen molar ratio distribution and flow rate uniformity entering the SCR denitrification catalyst, thus achieving a highly efficient denitrification effect.

[0007] Chinese patent document CN113230860A discloses a gas turbine flue gas denitrification system and method. This method requires installing an ozone generator at the tail end of the gas turbine. Ozone reacts with NO in the flue gas to generate NO2, which is then adsorbed by an adsorbent. The adsorbent and flue gas are then separated by a bag filter, and the clean flue gas is discharged through a chimney, thus achieving denitrification.

[0008] The aforementioned existing technology has the following technical problems:

[0009] Chinese patent document CN110508132B is similar to existing denitrification processes, mainly improving the uniformity of the ammonia-nitrogen molar ratio distribution and flow rate uniformity entering the SCR denitrification catalyst. However, it cannot change the low denitrification efficiency under low load and the selectivity of the SCR catalyst for NO and NO2, thus being limited by the actual performance of the catalyst.

[0010] Chinese patent document CN113230860A utilizes ozone oxidation and adsorbent adsorption to remove NO and NO2 from flue gas, achieving the purpose of separating and purifying the flue gas through a bag filter. However, this process significantly increases the system resistance. For gas turbines, the increased back pressure reduces gas efficiency, and the ozone generator has high energy consumption. Overall, the system is not economical and has high operating costs.

[0011] In summary, among the currently disclosed processes for denitrification of gas turbine flue gas, the denitrification effect and operational economy at low temperatures are prominent issues, necessitating redesign and development. Summary of the Invention

[0012] To address the aforementioned technical problems, this invention provides a highly efficient SCR denitrification structure and process for gas turbines, enabling the SCR denitrification reaction to proceed at a lower temperature. This reduces the amount of catalyst used and achieves full-load denitrification, providing valuable insights for current gas turbine denitrification retrofitting and even long-term full-load denitrification of gas turbines. Furthermore, it offers significant economic advantages and practical feasibility.

[0013] To achieve the above objectives, the technical solution of the present invention is as follows:

[0014] This invention provides a high-efficiency SCR denitrification structure for gas turbines, comprising: an SCR denitrification inlet NO... x Concentration monitor, SCR denitrification outlet NO x A concentration monitor, an SCR denitrification outlet H2O2 concentration monitor, and a boiler load monitor are included. The boiler load monitor is used to detect flue gas volume data in boiler load-related data. The SCR denitrification inlet NO concentration monitor is also included. x Concentration monitor, NO at the SCR denitrification outlet x The concentration monitor, the H2O2 concentration monitor at the SCR denitrification outlet, and the boiler load monitor are electrically connected to the controller. The controller is electrically connected to the H2O2 solution metering distributor and the urea solution metering distributor, respectively. The controller is used to calculate and control the H2O2 solution metering distributor and the urea solution metering distributor to distribute the amount of H2O2 and urea injected into the gas turbine outlet so as to achieve a NO concentration to NO2 concentration molar ratio of 1.0 to 1.1 in the flue gas during the SCR denitrification reaction.

[0015] This invention provides a highly efficient SCR denitrification structure and process for gas turbines, which enables the SCR denitrification reaction to proceed at a lower temperature. This reduces the amount of catalyst used and achieves full-load denitrification. It has significant reference value for current gas turbine denitrification retrofitting and even long-term full-load denitrification of gas turbines, and has obvious economic advantages and practical feasibility.

[0016] As a preferred technical solution, it includes: a gas turbine, wherein a gas turbine outlet is provided in the inner cavity at one end of the gas turbine, and an H2O2 solution spray gun and a urea solution spray gun are respectively provided at the gas turbine outlet. The H2O2 solution spray gun is connected to one end of the H2O2 solution metering and distributing transmission pipe, and the urea solution spray gun is connected to one end of the urea solution metering and distributing transmission pipe.

[0017] As a preferred technical solution, an evaporator, an SCR reactor, and a superheater are sequentially arranged in the gas turbine cavity from the gas turbine outlet to the other end of the gas turbine.

[0018] As a preferred technical solution, the other end of the H2O2 solution metering distributor is connected to the H2O2 solution storage tank; the other end of the urea solution metering distributor is connected to the urea solution storage tank.

[0019] As a preferred technical solution, the SCR denitrification inlet NO x The concentration monitor is located between the evaporator and the SCR reactor; the NO concentration at the SCR denitrification outlet is... x The concentration monitor and the H2O2 concentration monitor at the SCR denitrification outlet are located between the SCR reactor and the superheater.

[0020] This invention provides a highly efficient SCR denitrification process for gas turbines, comprising the following steps:

[0021] NO was detected at the SCR denitrification inlet. x Concentration data, SCR denitrification outlet NO x Concentration data, SCR denitrification outlet H2O2 concentration data, and flue gas volume data in boiler load-related data;

[0022] According to the SCR denitrification inlet NO x Concentration data, SCR denitrification outlet NO x Based on the concentration data, SCR denitrification outlet H2O2 concentration data, and flue gas volume data related to boiler load, the amount of H2O2 solution injected into the gas turbine outlet is calculated and controlled. The H2O2 solution injected into the gas turbine outlet evaporates to form H2O2 gas, which reacts with NO in the flue gas as follows:

[0023] H₂O₂ + NO = NO₂ + H₂O;

[0024] According to the SCR denitrification inlet NO x Concentration data, SCR denitrification outlet NO x Based on the concentration data, SCR denitrification outlet H2O2 concentration data, and flue gas volume data related to boiler load, the amount of urea solution injected into the gas turbine outlet is calculated and controlled. The urea solution injected into the gas turbine outlet undergoes pyrolysis through evaporation and travels with the flue gas to the downstream SCR reactor, where it reacts with NO and NO2 in the flue gas as follows:

[0025] 2NO + 4NH3 + 2NO2 + O2 = 4N2 + 6H2O

[0026] 4NO + 4NH3 + O2 = 4N2 + 6H2O.

[0027] As a preferred technical solution, based on the NO at the SCR denitrification inlet... x Concentration data, SCR denitrification outlet NO x Based on the concentration data, SCR denitrification outlet H2O2 concentration data, and flue gas volume data related to boiler load, the amount of H2O2 solution injected into the gas turbine outlet is calculated and controlled, including the following steps:

[0028] The NO and NO2 concentrations at the SCR inlet are detected. When the NO / NO2 molar ratio is not in the range of 1.0 to 1.1, the required amount of H2O2 is calculated. The required amount of H2O2 is calculated using the following formula:

[0029] m H2O2 =1 / 2(m NO -m NO2);

[0030] In the above formula, m H2O2 m is the amount of H2O2 required. NO为 SCR inlet NO concentration; m NO2为 SCR inlet NO2 concentration;

[0031] The flue gas volume data in the boiler load-related data was detected. Based on the flue gas volume data in the boiler load-related data, the required amount of H2O2 was calculated using the following formula:

[0032] The amount of H2O2 required = Q × mH2O2 × 22.4;

[0033] In the above formula, Q represents the flue gas volume data in the boiler load-related data, and mH2O2 represents the amount of H2O2 required.

[0034] The amount of H2O2 solution injected into the gas turbine outlet is controlled according to the required amount of H2O2.

[0035] As a preferred technical solution, based on the NO at the SCR denitrification inlet... x Concentration data, SCR denitrification outlet NO x The calculation and control of the amount of H2O2 solution injected into the gas turbine outlet, based on the concentration data, SCR denitrification outlet H2O2 concentration data, and boiler load-related flue gas volume data, also includes the following steps:

[0036] The preset H2O2 concentration threshold data at the SCR denitrification outlet is compared with the SCR denitrification outlet H2O2 concentration threshold data to obtain comparison data. Based on the comparison data, the amount of H2O2 solution injected into the gas turbine outlet is controlled to ensure that the SCR denitrification outlet H2O2 concentration data does not exceed the preset SCR denitrification outlet H2O2 concentration threshold data.

[0037] As a preferred technical solution, based on the NO at the SCR denitrification inlet... x Concentration data, SCR denitrification outlet NO x Based on the concentration data, SCR denitrification outlet H2O2 concentration data, and flue gas volume data related to boiler load, the amount of urea solution injected into the gas turbine outlet is calculated and controlled, including the following steps:

[0038] According to the SCR denitrification inlet NO x Concentration data and SCR denitrification outlet NO x NO concentration data calculation x The difference is calculated using the following formula:

[0039] The required amount of urea = 1 / 2 (inlet NO) xConcentration - Export NO x concentration);

[0040] EntranceNO x NO concentration at SCR denitrification inlet x Concentration data, export NO x NO concentration at SCR denitrification outlet x Concentration data;

[0041] The flue gas volume data in the boiler load-related data was detected. Based on this data, the required amount of urea was calculated using the following formula:

[0042] The amount of urea required = Q × the amount of urea required × 22.4;

[0043] In the above formula, Q represents the flue gas volume data in the boiler load-related data;

[0044] The amount of urea solution injected into the gas turbine outlet is controlled according to the required amount of urea.

[0045] As a preferred technical solution, the amount of H2O2 and urea injected into the gas turbine outlet is calculated and controlled to ensure that the molar ratio of NO concentration to NO2 concentration in the flue gas is 1.0 to 1.1, so as to achieve the main reaction 2NO + 4NH3 + 2NO2 + O2 = 4N2 + 6H2O in the flue gas, and the secondary reaction 4NO + 4NH3 + O2 = 4N2 + 6H2O.

[0046] This invention provides a highly efficient SCR denitrification structure and process for gas turbines. Unlike existing technologies that often employ standard SCR denitrification reactions, this process involves injecting H2O2 solution at the gas turbine outlet, followed by the vaporization of the H2O2 gas to convert NO in the original flue gas into partial NO2 gas. This increases the proportion of NO2 in the flue gas, achieving a slight excess of NO concentration over NO2. The amount of H2O2 and urea injected into the gas turbine outlet is carefully controlled and calculated. The rapid SCR denitrification reaction allows the reaction to occur at a lower temperature, reducing catalyst usage and enabling full-load denitrification. This process and method are applicable to both new gas turbine denitrification and in-service gas turbine denitrification retrofitting. It provides valuable reference for current gas turbine denitrification retrofitting and even long-term full-load gas turbine denitrification, offering significant economic advantages and practical feasibility. Attached Figure Description

[0047] Figure 1 A schematic diagram of a high-efficiency SCR denitrification structure for gas turbines provided by this invention;

[0048] Figure 2A circuit diagram of a high-efficiency gas turbine SCR denitrification structure provided by the present invention;

[0049] Wherein, 1-gas turbine, 2-gas turbine outlet; 3-SCR denitrification inlet NO. x Concentration monitor; NO at 4-SCR denitrification outlet x 5-SCR denitrification outlet H2O2 concentration monitor; 6-Boiler load monitor; 7-Controller; 8-H2O2 solution metering distributor; 9-Urea solution metering distributor; 10-H2O2 solution spray gun; 11-H2O2 solution metering and distribution transmission pipeline; 12-Urea solution spray gun; 13-Urea solution metering and distribution transmission pipeline; 14-Evaporator; 15-SCR reactor; 16-Superheater; 17-H2O2 solution storage tank; 18-Urea solution storage tank. Detailed Implementation

[0050] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0051] It is understood that the present invention achieves its purpose through some embodiments. The present invention provides a high-efficiency gas turbine SCR denitrification structure, including: an SCR denitrification inlet NO. x Concentration monitor 3, SCR denitrification outlet NO x Concentration monitor 4, SCR denitrification outlet H2O2 concentration monitor 5, and boiler load monitor 6. The boiler load monitor 6 is used to detect flue gas volume data in boiler load-related data. The SCR denitrification inlet NO concentration monitor 5 is used to detect flue gas volume data in boiler load-related data. x Concentration monitor 3, NO at the SCR denitrification outlet xConcentration monitor 4, SCR denitrification outlet H2O2 concentration monitor 5, and boiler load monitor 6 are electrically connected to controller 7. Controller 7 is electrically connected to H2O2 solution metering distributor 8 and urea solution metering distributor 9. Controller 7 is used to calculate and control the H2O2 and urea amounts injected into gas turbine outlet 2 by H2O2 solution metering distributor 8 and urea solution metering distributor 9 respectively, so as to achieve a NO to NO2 concentration molar ratio of 1.0 to 1.1 in the flue gas during the SCR denitrification reaction. Gas turbine outlet 2 is located in the inner cavity of one end of gas turbine 1, and H2O2 solution sprayers are respectively installed at gas turbine outlet 2. The system includes an H2O2 solution spray gun 10 and a urea solution spray gun 12. The H2O2 solution spray gun 10 is connected to one end of the H2O2 solution metering and distributing pipeline 11, and the urea solution spray gun 12 is connected to one end of the urea solution metering and distributing pipeline 13. An evaporator 14, an SCR reactor 15, and a superheater 16 are sequentially arranged within the gas turbine 1 cavity from the gas turbine outlet 2 to the other end of the gas turbine 1. The other end of the H2O2 solution metering and distributing pipeline 8 is connected to an H2O2 solution storage tank 17. The other end of the urea solution metering and distributing pipeline 9 is connected to a urea solution storage tank 18. The SCR denitrification inlet NO... x The concentration monitor 3 is located between the evaporator 14 and the SCR reactor 15; the NO concentration at the SCR denitrification outlet is... x The concentration monitor 4 and the SCR denitrification outlet H2O2 concentration monitor 5 are located between the SCR reactor 15 and the superheater 16;

[0052] SCR denitrification inlet NO x Concentration monitor 3 detected NO at the SCR denitrification inlet. x Concentration signal, SCR denitrification outlet NO x Concentration monitor 4 detected NO at the SCR denitrification outlet. x The concentration signal, the SCR denitrification outlet H2O2 concentration monitor 5 detected the SCR denitrification outlet H2O2 concentration signal, and the boiler load monitor 6 detected the flue gas volume signal in the boiler load related data, and sent the SCR denitrification inlet NO to the controller 7. x Concentration signal, SCR denitrification outlet NO x The controller 7 detects and processes the signals, including the concentration signal, the H2O2 concentration signal at the SCR denitrification outlet, and the flue gas volume signal from the boiler load-related data. Based on the received SCR denitrification inlet NO... x Concentration data, SCR denitrification outlet NO xThe concentration data, SCR denitrification outlet H2O2 concentration data, and flue gas volume data related to boiler load are used to calculate and control the amount of H2O2 solution injected into the gas turbine outlet and the amount of urea solution injected into the gas turbine outlet by the urea solution spray gun, respectively. Based on the calculated and controlled amount of H2O2 solution injected into the gas turbine outlet, controller 7 controls H2O2 solution metering distributor 8 to distribute the amount of H2O2 solution injected into the gas turbine outlet by H2O2 solution spray gun 10. The H2O2 solution injected into gas turbine outlet 2 evaporates to form H2O2. The gas reacts with NO in the flue gas as follows: H2O2 + NO = NO2 + H2O; increasing the proportion of NO2 in the flue gas achieves a slight excess of NO concentration over NO2 concentration; the amount of urea solution injected into the gas turbine outlet is controlled according to calculations, and the controller 7 controls the urea solution metering distributor 9 to distribute the amount of urea solution injected into the gas turbine outlet 2 by the urea solution spray gun 17. The urea solution injected into the gas turbine outlet 2 undergoes pyrolysis through evaporation and travels with the flue gas to the downstream SCR catalyst reactor, where it reacts with NO and NO2 in the flue gas as follows:

[0053] 2NO + 4NH3 + 2NO2 + O2 = 4N2 + 6H2O

[0054] 4NO + 4NH3 + O2 = 4N2 + 6H2O;

[0055] By calculating and controlling the amount of H2O2 and urea injected into the gas turbine outlet, the molar ratio of NO concentration to NO2 concentration in the flue gas is maintained at 1.0–1.1. This ensures that the flue gas maintains a predominant reaction of 2NO + 4NH3 + 2NO2 + O2 = 4N2 + 6H2O, with the secondary reaction of 4NO + 4NH3 + O2 = 4N2 + 6H2O. The 2NO + 4NH3 + 2NO2 + O2 = 4N2 + 6H2O reaction is a rapid SCR denitrification reaction, with a reaction rate several times faster than the standard SCR denitrification reaction (4NO + 4NH3 + O2 = 4N2 + 6H2O). Furthermore, under low-temperature conditions, NO... x The conversion rate is higher. Unlike existing technologies that mostly use standard SCR denitrification reactions, this process uses H2O2 solution injected at the gas turbine outlet 2 to vaporize H2O2 gas, which converts the original flue gas NO into partial NO2 gas, increasing the proportion of NO2 in the flue gas. This achieves a slight excess of NO concentration over NO2 concentration in the flue gas. The amount of H2O2 and urea injected into the gas turbine outlet is controlled and calculated. The rapid SCR denitrification reaction is used to carry out the SCR denitrification reaction at a lower temperature, which can reduce the amount of catalyst used and achieve full-load denitrification. This process route and method are applicable to both new gas turbine denitrification and in-service gas turbine denitrification retrofit. It has a good reference value for current gas turbine denitrification retrofit and even long-term full-load gas turbine denitrification, and has obvious economic advantages and practical feasibility.

[0056] This invention provides a highly efficient SCR denitrification process for gas turbines, comprising the following steps:

[0057] NO was detected at the SCR denitrification inlet. x Concentration data, SCR denitrification outlet NO x Concentration data, SCR denitrification outlet H2O2 concentration data, and flue gas volume data in boiler load-related data;

[0058] According to the SCR denitrification inlet NO x Concentration data, SCR denitrification outlet NO x Based on the concentration data, SCR denitrification outlet H2O2 concentration data, and flue gas volume data related to boiler load, the amount of H2O2 solution injected into the gas turbine outlet is calculated and controlled. The H2O2 solution injected into the gas turbine outlet evaporates to form H2O2 gas, which reacts with NO in the flue gas as follows:

[0059] H₂O₂ + NO = NO₂ + H₂O;

[0060] According to the SCR denitrification inlet NO x Concentration data, SCR denitrification outlet NO x Based on the concentration data, SCR denitrification outlet H2O2 concentration data, and flue gas volume data related to boiler load, the amount of urea solution injected into the gas turbine outlet is calculated and controlled. The urea solution injected into the gas turbine outlet undergoes pyrolysis through evaporation and travels with the flue gas to the downstream SCR catalyst, where it reacts with NO and NO2 in the flue gas as follows:

[0061] 2NO + 4NH3 + 2NO2 + O2 = 4N2 + 6H2O

[0062] 4NO + 4NH3 + O2 = 4N2 + 6H2O;

[0063] According to the SCR denitrification inlet NO x Concentration data, SCR denitrification outlet NO x Based on the concentration data, SCR denitrification outlet H2O2 concentration data, and flue gas volume data related to boiler load, the amount of H2O2 solution injected into the gas turbine outlet is calculated and controlled, including the following steps:

[0064] The NO and NO2 concentrations at the SCR inlet are detected. When the NO / NO2 molar ratio is not in the range of 1.0 to 1.1, the required amount of H2O2 is calculated. The required amount of H2O2 is calculated using the following formula:

[0065] m H2O2 =1 / 2(m NO -m NO2 );

[0066] In the above formula, m H2O2 m is the amount of H2O2 required. NO为 SCR inlet NO concentration; m NO2为 SCR inlet NO2 concentration;

[0067] The flue gas volume data in the boiler load-related data was detected. Based on the flue gas volume data in the boiler load-related data, the required amount of H2O2 was calculated using the following formula:

[0068] The amount of H2O2 required = Q × mH2O2 × 22.4;

[0069] In the above formula, Q represents the flue gas volume data in the boiler load-related data, and mH2O2 represents the amount of H2O2 required.

[0070] The amount of H2O2 solution injected into the gas turbine outlet is controlled according to the calculated required amount of H2O2.

[0071] According to the SCR denitrification inlet NO x Concentration data, SCR denitrification outlet NO x The calculation and control of the amount of H2O2 solution injected into the gas turbine outlet, based on the concentration data, SCR denitrification outlet H2O2 concentration data, and boiler load-related flue gas volume data, also includes the following steps:

[0072] The preset threshold for H2O2 concentration at the SCR denitrification outlet is 10 μL / L. The preset threshold for H2O2 concentration at the SCR denitrification outlet is obtained by comparing the H2O2 concentration data at the SCR denitrification outlet with the threshold data. Based on the comparison data, the amount of H2O2 solution injected into the gas turbine outlet is controlled to ensure that the H2O2 concentration at the SCR denitrification outlet does not exceed the preset threshold data.

[0073] According to the SCR denitrification inlet NO x Concentration data, SCR denitrification outlet NO x Based on the concentration data, SCR denitrification outlet H2O2 concentration data, and flue gas volume data related to boiler load, the amount of urea solution injected into the gas turbine outlet is calculated and controlled, including the following steps:

[0074] According to the SCR denitrification inlet NO x Concentration data and SCR denitrification outlet NO x NO concentration data calculation x The difference is calculated using the following formula:

[0075] The required amount of urea = 1 / 2 (inlet NO) xConcentration - Export NO x concentration);

[0076] EntranceNO x NO concentration at SCR denitrification inlet x Concentration data, export NO x NO concentration at SCR denitrification outlet x Concentration data;

[0077] The flue gas volume data in the boiler load-related data was detected. Based on this data, the required amount of urea was calculated using the following formula:

[0078] The amount of urea required = Q × the amount of urea required × 22.4;

[0079] In the above formula, Q represents the flue gas volume data in the boiler load-related data;

[0080] The amount of urea solution injected into the gas turbine outlet is controlled according to the required amount of urea.

[0081] The amount of H2O2 and urea injected into the gas turbine outlet is calculated and controlled to maintain a NO to NO2 molar ratio of 1.0 to 1.1 in the flue gas. This ensures that the flue gas exhibits a predominantly reactive reaction (2NO + 4NH3 + 2NO2 + O2 = 4N2 + 6H2O), with the secondary reaction (4NO + 4NH3 + O2 = 4N2 + 6H2O). This 2NO + 4NH3 + 2NO2 + O2 = 4N2 + 6H2O reaction is a rapid SCR denitrification reaction, with a reaction rate several times faster than the standard SCR denitrification reaction (4NO + 4NH3 + O2 = 4N2 + 6H2O). Furthermore, under low-temperature conditions, NO... x Higher conversion rate.

[0082] The present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the efficient gas turbine SCR denitrification process method as described in any one of the above claims.

[0083] This invention provides a highly efficient SCR denitrification structure and process for gas turbines. Unlike existing technologies that often employ standard SCR denitrification reactions, this process involves injecting H2O2 solution at the gas turbine outlet, followed by the vaporization of the H2O2 gas to convert NO in the original flue gas into partial NO2 gas. This increases the proportion of NO2 in the flue gas, achieving a slight excess of NO concentration over NO2. The amount of H2O2 and urea injected into the gas turbine outlet is carefully controlled and calculated. The rapid SCR denitrification reaction allows the reaction to occur at a lower temperature, reducing catalyst usage and enabling full-load denitrification. This process and method are applicable to both new gas turbine denitrification and retrofitting of existing gas turbines. It provides valuable reference for current gas turbine denitrification retrofitting and even long-term full-load denitrification of gas turbines, offering significant economic advantages and practical feasibility. It ensures safe and efficient flue gas denitrification in new gas turbines, meeting more stringent environmental requirements.

[0084] The efficient gas turbine SCR denitrification structure and process method proposed in this invention were applied to the laboratory testing of a denitrification catalyst for a Class F gas turbine. The testing was conducted according to DL / T 1286 "Technical Specification for Testing Flue Gas Denitrification Catalysts in Thermal Power Plants"; the inlet NOx concentration was 50 mg / m³. 3 The ammonia-nitrogen molar ratio is 1.0, K is the catalyst activity, K2 / K1 = ln(1-η2) / ln(1-η1), and K2 / K1 is V. NO2 / V NO When =0.49, the activity value and V NO2 / V NO The ratio of the activity value when the activity value is 0 is shown in Table 1 below for gas turbine catalyst performance testing.

[0085] Table 1 Performance Testing of Gas Turbine Catalysts

[0086]

[0087]

[0088] The above examples demonstrate that when NO2 is absent in the flue gas, the original catalyst maintains good activity within the temperature range of 300℃ to 400℃. When the NO2 concentration in the flue gas increases to 49%, the original catalyst maintains good activity within the temperature range of 200℃ to 400℃. Furthermore, when the NO2 concentration in the flue gas increases to 49%, the activity of the original catalyst increases by 1.33 to 1.43 times, indirectly indicating that the catalyst volume can be significantly reduced after increasing the NO2 concentration. These examples illustrate that the efficient gas turbine SCR denitrification structure and process proposed in this invention can perform SCR denitrification reactions at lower temperatures, broadening the catalyst temperature window, reducing catalyst volume, and extending catalyst lifespan.

[0089] It is understood that this invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this invention. Furthermore, under the teachings of this invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this invention. Therefore, this invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are protected by this invention. Furthermore, under the teachings of this invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this invention. Therefore, this invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of this invention.

Claims

1. A highly efficient gas turbine SCR denitration process method, characterized in that, Denitrification is achieved using a gas turbine SCR denitrification structure, which includes: an SCR denitrification inlet NO. x Concentration monitor, SCR denitrification outlet NO x A concentration monitor, an SCR denitrification outlet H2O2 concentration monitor, and a boiler load monitor are included. The boiler load monitor is used to detect flue gas volume data in boiler load-related data. The SCR denitrification inlet NO concentration monitor is also included. x Concentration monitor, NO at the SCR denitrification outlet x The concentration monitor, the H2O2 concentration monitor at the SCR denitrification outlet, and the boiler load monitor are electrically connected to the controller. The controller is electrically connected to the H2O2 solution metering distributor and the urea solution metering distributor, respectively. The controller is used to calculate and control the H2O2 solution metering distributor and the urea solution metering distributor to distribute the amount of H2O2 and urea injected into the gas turbine outlet so as to achieve a NO concentration to NO2 concentration molar ratio of 1.0 to 1.1 in the flue gas during the SCR denitrification reaction. The method includes the following steps: NO was detected at the SCR denitrification inlet. x Concentration data, SCR denitrification outlet NO x Concentration data, SCR denitrification outlet H2O2 concentration data, and flue gas volume data in boiler load-related data; According to the SCR denitrification inlet NO x Concentration data, SCR denitrification outlet NO x Based on the concentration data, SCR denitrification outlet H2O2 concentration data, and flue gas volume data related to boiler load, the amount of H2O2 solution injected into the gas turbine outlet is calculated and controlled. The H2O2 solution injected into the gas turbine outlet evaporates to form H2O2 gas, which reacts with NO in the flue gas as follows: H₂O₂ + NO = NO₂ + H₂O; According to the SCR denitrification inlet NO x Concentration data, SCR denitrification outlet NO x Based on the concentration data, SCR denitrification outlet H2O2 concentration data, and flue gas volume data related to boiler load, the amount of urea solution injected into the gas turbine outlet is calculated and controlled. The urea solution injected into the gas turbine outlet undergoes pyrolysis through evaporation and travels with the flue gas to the downstream SCR reactor, where it reacts with NO and NO2 in the flue gas as follows: 2NO + 4NH3 + 2NO2 + O2 = 4N2 + 6H2O 4NO + 4NH3 + O2 = 4N2 + 6H2O According to the SCR denitrification inlet NO x Concentration data, SCR denitrification outlet NO x Based on the concentration data, SCR denitrification outlet H2O2 concentration data, and flue gas volume data related to boiler load, the amount of H2O2 solution injected into the gas turbine outlet is calculated and controlled, including the following steps: The NO and NO2 concentrations at the SCR inlet are detected. When the NO / NO2 molar ratio is not in the range of 1.0 to 1.1, the required amount of H2O2 is calculated. The required amount of H2O2 is calculated using the following formula: m H2O2 =1 / 2(m NO -m NO2 ); In the above equation, m H2O2 moles of H2O2 desired, m NO为 SCR inlet NO concentration; m NO2为 SCR inlet NO2 concentration; The flue gas volume data in the boiler load-related data was detected. Based on the flue gas volume data in the boiler load-related data, the required amount of H2O2 was calculated using the following formula: The amount of H2O2 required = Q × mH2O2 × 22.4; In the above formula, Q represents the flue gas volume data in the boiler load-related data, and mH2O2 represents the amount of H2O2 required. The amount of H2O2 solution injected into the gas turbine outlet is controlled according to the required amount of H2O2. According to the SCR denitrification inlet NO x Concentration data, SCR denitrification outlet NO x Based on the concentration data, SCR denitrification outlet H2O2 concentration data, and flue gas volume data related to boiler load, the amount of urea solution injected into the gas turbine outlet is calculated and controlled, including the following steps: According to the SCR De-NOx inlet NO x Concentration data and SCR De-NOx outlet NO x Concentration data calculate NO x Difference, calculated as follows: Moles of urea required = 1 / 2 (inlet NO x Concentration - outlet NO x Concentration); EntranceNO x NO concentration at SCR denitrification inlet x Concentration data, export NO x NO concentration at SCR denitrification outlet x Concentration data; The flue gas volume data in the boiler load-related data was detected. Based on this data, the required amount of urea was calculated using the following formula: The amount of urea required = Q × the amount of urea required × 22.4; In the above formula, Q represents the flue gas volume data in the boiler load-related data; The amount of urea solution injected into the gas turbine outlet is controlled according to the required amount of urea.

2. The process for high efficiency gas turbine SCR De-NOx method as claimed in claim 1 wherein, include: The gas turbine has an outlet in its inner cavity at one end. An H2O2 solution spray gun and a urea solution spray gun are respectively installed at the gas turbine outlet. The H2O2 solution spray gun is connected to one end of an H2O2 solution metering and distributing device through an H2O2 solution metering and distributing transmission pipe, and the urea solution spray gun is connected to one end of a urea solution metering and distributing device through a urea solution metering and distributing transmission pipe.

3. The process for high efficiency gas turbine SCR De-NOx method as claimed in claim 2 wherein, An evaporator, an SCR reactor, and a superheater are sequentially arranged inside the gas turbine cavity from the gas turbine outlet to the other end of the gas turbine.

4. The process for high efficiency gas turbine SCR De-NOx method as claimed in claim 2 wherein, The other end of the H2O2 solution metering distributor is connected to the H2O2 solution storage tank; the other end of the urea solution metering distributor is connected to the urea solution storage tank.

5. The process for high efficiency gas turbine SCR De-NOx method as claimed in claim 3 wherein, The SCR denitrification inlet NO x The concentration monitor is located between the evaporator and the SCR reactor; the NO concentration at the SCR denitrification outlet is... x The concentration monitor and the H2O2 concentration monitor at the SCR denitrification outlet are located between the SCR reactor and the superheater.

6. The efficient SCR denitrification process method for gas turbines according to claim 1, characterized in that, According to the SCR denitrification inlet NO x Concentration data, SCR denitrification outlet NO x The calculation and control of the amount of H2O2 solution injected into the gas turbine outlet, based on the concentration data, SCR denitrification outlet H2O2 concentration data, and boiler load-related flue gas volume data, also includes the following steps: The preset H2O2 concentration threshold data at the SCR denitrification outlet is compared with the SCR denitrification outlet H2O2 concentration threshold data to obtain comparison data. Based on the comparison data, the amount of H2O2 solution injected into the gas turbine outlet is controlled to ensure that the SCR denitrification outlet H2O2 concentration data does not exceed the preset SCR denitrification outlet H2O2 concentration threshold data.

7. The process for high efficiency gas turbine SCR De-NOx method as claimed in claim 6 wherein, The amount of H2O2 and urea injected into the gas turbine outlet is calculated and controlled to ensure that the molar ratio of NO concentration to NO2 concentration in the flue gas is 1.0 to 1.1, so as to maintain the reaction 2NO + 4NH3 + 2NO2 + O2 = 4N2 + 6H2O as the main reaction and 4NO + 4NH3 + O2 = 4N2 + 6H2O as the secondary reaction in the flue gas.

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