SCR-CO coupling device for sintering machine and coupling process of SCR-CO coupling device

Abstract

The invention relates to an SCR-CO coupling device for a sintering machine and a coupling process of the SCR-CO coupling device, and belongs to the field of energy conservation and emission reduction. The dust remover is used for removing dust in the sintering flue gas; the GGH heat exchanger is used for increasing the temperature of the sintering flue gas; the hot blast stove is used for further heating the sintering flue gas to meet the SCR denitration temperature requirement; the SCR denitration unit is used for reducing the concentration of nitric oxide in the sintering flue gas; the CO oxidation catalysis unit is used for catalytically oxidizing CO gas in the sintering flue gas to generate heat, and the heat is used for supplementing heating of the GGH heat exchanger to the flue gas; the fan is used for conveying sintering flue gas into the chimney from the GGH heat exchanger; and the chimney is used for discharging the treated sintering flue gas. The system has the advantages that energy is saved, consumption is reduced, heat generated by the CO oxidation catalysis unit is used for supplementing heating of the GGH heat exchanger to flue gas, consumption of blast furnace gas is reduced, and therefore energy consumption and operation cost are reduced.

Description

Technical Field

[0001] The invention relates to an SCR-CO coupling device for a sintering machine and a coupling process thereof, and belongs to the field of energy conservation and emission reduction. Background Art

[0002] The "Ambient Air Quality Standard" GB3095-2012 / XG1-2018 issued by the Ministry of Ecology and Environment has six main ambient air quality assessment indicators, namely fine particulate matter (PM2.5), inhalable particulate matter (PM10), ozone (O3), sulfur dioxide (SO2), nitrogen oxides (NOx), and carbon monoxide (CO). Carbon monoxide is one of the six pollutant parameters that make up the comprehensive air quality index. With the development of social economy and the requirements of national environmental protection policies, CO governance has gradually been paid attention to. The Ministry of Ecology and Environment has issued a method for detecting carbon monoxide in fixed source exhaust gas.

[0003] CO in the environment mainly comes from the fields of steel, chemical industry, metallurgy, waste incineration, automobile exhaust emissions, etc., among which the steel industry accounts for a large proportion of industrial CO emissions. According to statistics, CO emissions from steel sintering process account for more than 45% of the total emissions from the steel industry, with emission concentrations as high as 6000-10000mg / m 3 , CO governance is urgent. At present, many regions including Handan, Tangshan, Linfen, Rizhao, Yuncheng, etc. have issued relevant policy documents to carry out CO governance work in the steel industry.

[0004] In the steel smelting process, the flue gas emitted during the sintering process is the largest industrial waste gas with the most concentrated pollutants and the highest concentration. Because the fuel and mineral raw materials contain a certain amount of sulfur and ash, during the high-temperature combustion process, the main pollutants contained in the sintering flue gas are SO2, NOx, Hg and other heavy metals, as well as dust, which will cause certain pollution to the surrounding atmospheric environment. According to the national environmental emission standards and the requirements of the local environmental protection department, dust removal, desulfurization and denitrification facilities should be set up for the flue gas of steel sintering machines to ensure that the dust, SO2 and NOx emitted from the flue gas meet the national and local environmental emission requirements, and further reduce the emissions of dust, SO2 and NOx while ensuring that the standards are met in accordance with the total environmental control requirements.

[0005] In order to control the NOx concentration in the exhaust gas, the steel sintering machines are all equipped with SCR denitrification systems. The sintering flue gas has a large flow rate and low temperature. In order to meet the SCR denitrification temperature requirements, the flue gas before and after desulfurization needs to be heated by the GGH heat exchanger and then supplemented with heat by the hot blast furnace before it can be sent to the SCR denitrification device. During this heating process, the SCR denitrification system needs to be heated by about 30 to 40°C, and a large amount of blast furnace gas needs to be burned. The initial investment and operating energy consumption of the flue gas reheating system are very high.

[0006] Based on the above content, the existing technology has the following disadvantages:

[0007] 1. The sintering flue gas has a large flow rate and low temperature. In order to meet the SCR denitrification temperature requirements, the flue gas before and after desulfurization needs to be heated by the GGH heat exchanger first, and then supplemented with heat by the hot blast furnace before it can be sent to the SCR denitrification device. During this heating process, the SCR denitrification system needs to be heated by about 30 to 40°C, and a large amount of blast furnace gas needs to be burned. The initial investment and operating energy consumption of the flue gas reheating system are very high.

[0008] 2. According to statistics, CO emissions from the steel sintering process account for more than 45% of the total emissions from the steel industry, with emission concentrations as high as 6000-10000 mg / m 3 , CO governance is urgent. Summary of the invention

[0009] In order to overcome the defects of the prior art, the present invention provides an SCR-CO coupling device for a sintering machine and a coupling process thereof. The technical solution of the present invention is:

[0010] An SCR-CO coupling device for a sintering machine, comprising:

[0011] Desulfurization unit, used to remove sulfur from sintering flue gas;

[0012] Dust collector, used to remove dust from sintering flue gas;

[0013] GGH heat exchanger, used to increase the temperature of sintering flue gas;

[0014] Hot blast furnace, used to further heat the sintering flue gas to meet the SCR denitrification temperature requirements;

[0015] SCR denitrification unit, used to reduce the concentration of nitrogen oxides in sintering flue gas;

[0016] The CO oxidation catalytic unit is used to catalytically oxidize the CO gas in the sintering flue gas to generate heat, and the heat is used to supplement the heating of the flue gas by the GGH heat exchanger to reduce the consumption of blast furnace gas;

[0017] Fan, used to transport sintering flue gas from the GGH heat exchanger into the chimney;

[0018] Chimney, used to discharge treated sintering flue gas.

[0019] The CO oxidation catalytic unit is installed at the bottom layer inside the SCR denitrification unit. The flue gas passes through the CO oxidation catalytic unit to catalytically oxidize the CO gas. The heat released by the reaction enters the GGH heat exchanger to supplement the heat of the flue gas. After the flue gas temperature rises, it enters the SCR denitrification unit for denitrification.

[0020] The CO oxidation catalytic unit is installed between the GGH heat exchanger and the hot blast furnace. The flue gas passes through the CO oxidation catalytic unit to catalytically oxidize the CO gas to form CO2. The reaction releases heat to supplement the hot blast furnace. The hot blast furnace heats the flue gas to 220-280°C to reach the reaction temperature of the SCR denitrification unit. After that, the flue gas enters the SCR denitrification system for reaction. After the reaction of the SCR denitrification unit, the heat is recovered and returned to the GGH heat exchanger to supplement the temperature of the hot blast furnace.

[0021] It also includes a first temperature monitoring unit arranged at the GGH heat exchanger, which is used to monitor the temperature of the flue gas in real time and adjust the operating conditions of the CO oxidation catalytic unit through a control algorithm to optimize the generation and utilization of heat and ensure that the flue gas temperature meets the requirements of the SCR denitrification unit. The control algorithm is adjusted based on the following formula: Among them, T out is the flue gas temperature at the outlet of the GGH heat exchanger, T in is the flue gas temperature at the inlet of the GGH heat exchanger, Q reaction is the heat released by the CO oxidation catalytic unit reaction, m gas is the mass flow rate of flue gas, c p is the specific heat capacity of the flue gas.

[0022] The specific monitoring steps of the first temperature monitoring unit are as follows:

[0023] a. Collect the flue gas temperature data at the inlet and outlet of the GGH heat exchanger, the reaction heat data of the CO oxidation catalytic unit, the mass flow rate data of the flue gas and the specific heat capacity data of the flue gas;

[0024] b. Process the collected data using neural networks or fuzzy logic to predict the temperature changes of flue gas under different operating conditions;

[0025] c. Calculate the operating conditions of the CO oxidation catalytic unit that need to be adjusted based on the prediction results and the preset flue gas temperature setting value, including but not limited to the activity of the catalyst, the flow rate of the flue gas and the residence time of the flue gas;

[0026] d. Through closed-loop control, the operating conditions of the CO oxidation catalytic unit, as well as the operating parameters of the GGH heat exchanger and hot air stove are adjusted in real time to ensure that the flue gas temperature is stable within the optimal reaction temperature range of the SCR denitrification unit;

[0027] e. Adopt adaptive control strategy to automatically update control parameters according to environmental changes and equipment aging factors to maintain long-term stable operating performance.

[0028] It also includes a second temperature monitoring unit arranged at the hot blast stove, which is used to monitor the temperature of the flue gas in real time and adjust the operating conditions of the hot blast stove through a control algorithm to ensure that the flue gas temperature meets the requirements of the SCR denitrification unit. The control algorithm is adjusted based on the following formula:

[0029] T out =f(T in , Q reaction , m gas , c p , ΔT set ) where T out is the flue gas temperature at the hot blast stove outlet, T in is the flue gas temperature at the hot blast stove inlet, Q reaction is the heat released by the CO oxidation catalytic unit reaction, m gas is the mass flow rate of flue gas, c p is the specific heat capacity of the flue gas, ΔT set is the preset temperature change value; function f represents the control strategy for dynamically adjusting the hot blast furnace operating conditions according to real-time data and preset parameters.

[0030] The specific monitoring steps of the second temperature monitoring unit are as follows:

[0031] a. Use Kalman filter to filter noise and estimate state of collected flue gas temperature data to improve the accuracy of temperature measurement;

[0032] b. Calculate the optimal operating parameters of the hot blast stove through the optimization algorithm based on the real-time monitored flue gas temperature and the preset control target;

[0033] c. Input the calculated optimal operating parameters into the actuator to adjust the combustion process of the hot blast stove;

[0034] d. Regularly update the parameters of the control model to adapt to the impact of equipment aging and environmental changes on system performance;

[0035] e. Store and analyze historical operation data to continuously improve control strategies and enhance the system's adaptive capabilities.

[0036] The third temperature monitoring unit is also provided at the SCR denitration location for real-time monitoring of the temperature of the flue gas. The third temperature monitoring unit is used to monitor the temperature of the flue gas in real time and adjust the operating conditions of the SCR denitration unit through a control algorithm to ensure that the flue gas temperature is stable within the optimal temperature range of the denitration reaction. The control algorithm is adjusted based on the following formula:

[0037] T out,SCR =f(T in，SCR , Q reaction , m gas , cp , ΔT set，SCR );

[0038] Among them, T out,SCR is the flue gas temperature at the outlet of the SCR denitrification unit, T in,SCR is the flue gas temperature at the inlet of the SCR denitrification unit, Q reaction is the heat released by the CO oxidation catalytic unit reaction, m gas is the mass flow rate of flue gas, c p is the specific heat capacity of the flue gas, Δ Tset,SCR is the preset temperature change value of the SCR denitrification unit; function f represents the control strategy for dynamically adjusting the operating conditions of the SCR denitrification unit according to real-time data and preset parameters.

[0039] The specific monitoring steps of the third temperature monitoring unit are as follows:

[0040] a. Collect the flue gas temperature data at the inlet and outlet of the SCR denitration unit, the reaction heat data of the CO oxidation catalytic unit, the mass flow rate data of the flue gas and the specific heat capacity data of the flue gas;

[0041] b. Process the collected data using neural networks or fuzzy logic to predict the temperature changes of flue gas under different operating conditions;

[0042] c. Calculate the operating conditions of the SCR denitration unit that need to be adjusted based on the prediction results and the preset flue gas temperature setting value, including but not limited to the activity of the catalyst, the flow rate of the flue gas and the residence time of the flue gas;

[0043] d. Through closed-loop control, the operating conditions of the SCR denitrification unit are adjusted in real time to ensure that the flue gas temperature is stable within the optimal temperature range of the denitrification reaction;

[0044] e. Adopt adaptive control strategy to automatically update control parameters according to environmental changes and equipment aging factors to maintain long-term stable operating performance.

[0045] A coupling process based on an SCR-CO coupling device for a sintering machine comprises the following steps: flue gas desulfurization: the sintering flue gas first enters a desulfurization unit, and the sulfur in the flue gas is removed by the desulfurization unit;

[0046] Flue gas dust removal: The flue gas after desulfurization enters the dust collector to remove dust particles in the flue gas; Flue gas preheating: The flue gas after dust removal is preheated by the GGH heat exchanger to increase the flue gas temperature;

[0047] Further heating of flue gas: the preheated flue gas enters the hot air furnace and is further heated to meet the temperature requirements of the SCR denitrification reaction;

[0048] CO catalytic oxidation: The heated high-temperature flue gas flows into the CO oxidation catalytic unit, where the CO gas in the flue gas undergoes a catalytic oxidation reaction under the action of the catalyst to generate CO2 and release heat; Heat recovery: The heat released by the CO oxidation catalytic unit is recovered to supplement the heating of the flue gas by the GGH heat exchanger;

[0049] Flue gas denitrification: Flue gas treated by the CO oxidation catalytic unit and carrying additional heat enters the SCR denitrification unit. Nitrogen oxides (NOx) in the flue gas are reduced to nitrogen and water under the action of the catalyst to achieve denitrification;

[0050] Flue gas transportation: The flue gas after denitrification is transported by the fan and enters the chimney from the GGH heat exchanger.

[0051] Flue gas emission: The treated clean flue gas is discharged into the atmosphere through the chimney, realizing the clean emission of sintering flue gas.

[0052] Temperature monitoring and control: The temperature monitoring units installed at the GGH heat exchanger, hot air stove and SCR denitrification unit monitor the flue gas temperature in real time, and adjust the operating conditions of the CO oxidation catalytic unit, hot air stove and SCR denitrification unit through the control algorithm to ensure that the flue gas temperature is stable within the optimal reaction range.

[0053] The advantages of the present invention are:

[0054] Energy saving and consumption reduction: The heat generated by the CO oxidation catalytic unit is used to supplement the heating of flue gas by the GGH heat exchanger, reducing the consumption of blast furnace gas, thereby reducing energy consumption and operating costs.

[0055] Reduce CO emissions: CO gas is catalytically oxidized into carbon dioxide under the action of the catalyst, which effectively reduces CO emissions, helps improve environmental quality and reduce greenhouse gas emissions.

[0056] Improve denitrification efficiency: Before the flue gas enters the SCR denitrification unit, it is preheated by the CO oxidation catalytic unit to better meet the temperature requirements of the SCR denitrification reaction, thereby improving the denitrification efficiency.

[0057] Reduce operating costs: Since the use of blast furnace gas is reduced, not only energy is saved, but also related operating and maintenance costs are reduced.

[0058] Improve system stability: By precisely controlling the flue gas temperature, the denitrification reaction is ensured to proceed under optimal conditions, thus improving the stability and reliability of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 It is a schematic diagram of the main structure of the first embodiment of the present invention.

[0060] Figure 2 It is a schematic diagram of the main structure of the second embodiment of the present invention. DETAILED DESCRIPTION

[0061] The present invention will be further described below in conjunction with specific embodiments, and the advantages and features of the present invention will become clearer as the description proceeds. However, these embodiments are exemplary only and do not constitute any limitation to the scope of the present invention. It should be understood by those skilled in the art that the details and forms of the technical solution of the present invention may be modified or replaced without departing from the spirit and scope of the present invention, but these modifications and replacements all fall within the scope of protection of the present invention.

[0062] See also Figure 1 and Figure 2 The present invention relates to an SCR-CO coupling device for a sintering machine, comprising:

[0063] Desulfurization unit 1, which adopts wet, dry or semi-dry method to remove sulfur from sintering flue gas;

[0064] Dust collector 2, used to remove dust from sintering flue gas;

[0065] GGH heat exchanger 4, used to increase the temperature of sintering flue gas;

[0066] Hot blast furnace 3, used to further heat the sintering flue gas to meet the SCR denitrification temperature requirements;

[0067] SCR denitration unit 5, used to reduce the concentration of nitrogen oxides in sintering flue gas;

[0068] CO oxidation catalytic unit 6 (CO oxidation catalyst), used for catalytically oxidizing CO gas in sintering flue gas to generate heat, and the heat is used to supplement the heating of flue gas by GGH heat exchanger to reduce the consumption of blast furnace gas;

[0069] Fan 7, used to transport sintering flue gas from the GGH heat exchanger into the chimney;

[0070] The chimney 8 is used to discharge the treated sintering flue gas.

[0071] like Figure 1 As shown, the CO oxidation catalytic unit is placed at the rear, and the CO oxidation catalytic unit is installed at the bottom layer inside the SCR denitrification unit. The flue gas passes through the CO oxidation catalytic unit to catalytically oxidize the CO gas, and the heat released by the reaction enters the GGH heat exchanger to supplement the heat of the flue gas. After the flue gas temperature rises, it enters the SCR denitrification unit for denitrification.

[0072] like Figure 2As shown, the CO oxidation catalytic unit is placed in front and installed between the GGH heat exchanger and the hot blast furnace. The flue gas passes through the CO oxidation catalytic unit to catalytically oxidize the CO gas to form CO2. The reaction releases heat to supplement the hot blast furnace. The hot blast furnace heats the flue gas to 220-280°C to reach the reaction temperature of the SCR denitrification unit. After that, the flue gas enters the SCR denitrification system for reaction. After the reaction of the SCR denitrification unit, the heat is recovered and returned to the GGH heat exchanger to supplement the temperature of the hot blast furnace.

[0073] It also includes a first temperature monitoring unit arranged at the GGH heat exchanger, which is used to monitor the temperature of the flue gas in real time and adjust the operating conditions of the CO oxidation catalytic unit through a control algorithm to optimize the generation and utilization of heat and ensure that the flue gas temperature meets the requirements of the SCR denitrification unit. The control algorithm is adjusted based on the following formula: Among them, T out is the flue gas temperature at the outlet of the GGH heat exchanger, T in is the flue gas temperature at the inlet of the GGH heat exchanger, Q reaction is the heat released by the CO oxidation catalytic unit reaction, m gas is the mass flow rate of flue gas, c p is the specific heat capacity of the flue gas.

[0074] The specific monitoring steps of the first temperature monitoring unit are as follows:

[0075] a. Collect the flue gas temperature data at the inlet and outlet of the GGH heat exchanger, the reaction heat data of the CO oxidation catalytic unit, the mass flow rate data of the flue gas and the specific heat capacity data of the flue gas;

[0076] b. Process the collected data using neural networks or fuzzy logic to predict the temperature changes of flue gas under different operating conditions;

[0077] c. Calculate the operating conditions of the CO oxidation catalytic unit that need to be adjusted based on the prediction results and the preset flue gas temperature setting value, including but not limited to the activity of the catalyst, the flow rate of the flue gas and the residence time of the flue gas;

[0078] d. Through closed-loop control, the operating conditions of the CO oxidation catalytic unit, as well as the operating parameters of the GGH heat exchanger and hot air stove are adjusted in real time to ensure that the flue gas temperature is stable within the optimal reaction temperature range of the SCR denitrification unit;

[0079] e. Adopt adaptive control strategy to automatically update control parameters according to environmental changes and equipment aging factors to maintain long-term stable operating performance.

[0080] It also includes a second temperature monitoring unit arranged at the hot blast stove, which is used to monitor the temperature of the flue gas in real time and adjust the operating conditions of the hot blast stove through a control algorithm to ensure that the flue gas temperature meets the requirements of the SCR denitrification unit. The control algorithm is adjusted based on the following formula:

[0081] T out =f(T in , Q reaction , m gas , c p , ΔT set ) where T out is the flue gas temperature at the hot blast stove outlet, T in is the flue gas temperature at the hot blast stove inlet, Q reaction is the heat released by the CO oxidation catalytic unit reaction, m gas is the mass flow rate of flue gas, c p is the specific heat capacity of the flue gas, ΔT set is the preset temperature change value; function f represents the control strategy for dynamically adjusting the hot blast stove operating conditions according to real-time data and preset parameters. This strategy uses advanced control theories such as model predictive control (MPC) or adaptive control to achieve precise control of the hot blast stove outlet flue gas temperature;

[0082] The specific monitoring steps of the second temperature monitoring unit are as follows:

[0083] a. Use Kalman filter to filter noise and estimate state of collected flue gas temperature data to improve the accuracy of temperature measurement;

[0084] b. Calculate the optimal operating parameters of the hot blast stove through the optimization algorithm based on the real-time monitored flue gas temperature and the preset control target;

[0085] c. Inputting the calculated optimal operating parameters into the actuator, such as the regulating valve, to adjust the combustion process of the hot blast stove;

[0086] d. Regularly update the parameters of the control model to adapt to the impact of equipment aging and environmental changes on system performance;

[0087] e. Store and analyze historical operation data to continuously improve control strategies and enhance the system's adaptive capabilities.

[0088] The third temperature monitoring unit is also provided at the SCR denitration location for real-time monitoring of the temperature of the flue gas. The third temperature monitoring unit is used to monitor the temperature of the flue gas in real time and adjust the operating conditions of the SCR denitration unit through a control algorithm to ensure that the flue gas temperature is stable within the optimal temperature range of the denitration reaction. The control algorithm is adjusted based on the following formula:

[0089] Tout,SCR =f(T in，SCR , Q reaction , m gas , c p , ΔT set，SCR );

[0090] Among them, T out,SCR is the flue gas temperature at the outlet of the SCR denitrification unit, T in,SCR is the flue gas temperature at the inlet of the SCR denitrification unit, Q reaction is the heat released by the CO oxidation catalytic unit reaction, m gas is the mass flow rate of flue gas, c p is the specific heat capacity of the flue gas, Δ Tset,SCR is the preset temperature change value of the SCR denitrification unit; function f represents the control strategy for dynamically adjusting the operating conditions of the SCR denitrification unit according to real-time data and preset parameters.

[0091] The control strategy utilizes advanced control theories such as model predictive control (MPC) or adaptive control to achieve precise control of the flue gas temperature at the outlet of the SCR denitrification unit.

[0092] The specific monitoring steps of the third temperature monitoring unit are as follows:

[0093] a. Collect the flue gas temperature data at the inlet and outlet of the SCR denitration unit, the reaction heat data of the CO oxidation catalytic unit, the mass flow rate data of the flue gas and the specific heat capacity data of the flue gas;

[0094] b. Process the collected data using neural networks or fuzzy logic to predict the temperature changes of flue gas under different operating conditions;

[0095] c. Calculate the operating conditions of the SCR denitration unit that need to be adjusted based on the prediction results and the preset flue gas temperature setting value, including but not limited to the activity of the catalyst, the flow rate of the flue gas and the residence time of the flue gas;

[0096] d. Through closed-loop control, the operating conditions of the SCR denitrification unit are adjusted in real time to ensure that the flue gas temperature is stable within the optimal temperature range of the denitrification reaction;

[0097] e. Adopt adaptive control strategy to automatically update control parameters according to environmental changes and equipment aging factors to maintain long-term stable operating performance.

[0098] The present invention also relates to an SCR-CO coupling process for a sintering machine, comprising the following steps:

[0099] Flue gas desulfurization: The sintering flue gas first enters the desulfurization unit, where the sulfur in the flue gas is removed to reduce SOx emissions;

[0100] Flue gas dust removal: The flue gas after desulfurization enters the dust collector to remove dust particles in the flue gas and reduce dust emissions;

[0101] Flue gas preheating: The flue gas after dust removal is preheated by the GGH heat exchanger to increase the flue gas temperature and provide suitable temperature conditions for subsequent catalytic oxidation and denitrification reactions;

[0102] Further heating of flue gas: the preheated flue gas enters the hot air furnace and is further heated to meet the temperature requirements of the SCR denitrification reaction;

[0103] CO catalytic oxidation: The heated high-temperature flue gas flows into the CO oxidation catalytic unit, and the CO gas in the flue gas undergoes a catalytic oxidation reaction under the action of the catalyst to generate CO2 and release heat; Heat recovery and utilization: The heat released by the CO oxidation catalytic unit is recovered to supplement the heating of the flue gas by the GGH heat exchanger and reduce the consumption of blast furnace gas.

[0104] Flue gas denitrification: Flue gas treated by the CO oxidation catalytic unit and carrying additional heat enters the SCR denitrification unit. Nitrogen oxides (NOx) in the flue gas are reduced to nitrogen and water under the action of the catalyst to achieve denitrification.

[0105] Flue gas transportation: The flue gas after denitrification is transported by the fan and enters the chimney from the GGH heat exchanger. Flue gas emission: The treated clean flue gas is discharged into the atmosphere through the chimney to achieve clean emission of sintering flue gas.

[0106] Temperature monitoring and control: The temperature monitoring units installed at the GGH heat exchanger, hot air stove and SCR denitrification unit monitor the flue gas temperature in real time, and adjust the operating conditions of the CO oxidation catalytic unit, hot air stove and SCR denitrification unit through the control algorithm to ensure that the flue gas temperature is stable within the optimal reaction range.

[0107] This process can reduce CO emissions while reducing gas usage, lowering operating costs and saving energy.

[0108] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A SCR-CO coupling device for a sintering machine, characterized in that: include: Desulfurization unit, used to remove sulfur from sintering flue gas; Dust collector, used to remove dust from sintering flue gas; GGH heat exchanger, used to increase the temperature of sintering flue gas; Hot blast furnace, used to further heat the sintering flue gas to meet the SCR denitrification temperature requirements; SCR denitrification unit, used to reduce the concentration of nitrogen oxides in sintering flue gas; The CO oxidation catalytic unit is used to catalytically oxidize the CO gas in the sintering flue gas to generate heat, and the heat is used to supplement the heating of the flue gas by the GGH heat exchanger to reduce the consumption of blast furnace gas; Fan, used to transport sintering flue gas from the GGH heat exchanger into the chimney; Chimney, used to discharge treated sintering flue gas.

2. The SCR-CO coupling device for sintering machine according to claim 1, characterized in that: The CO oxidation catalytic unit is installed at the bottom layer inside the SCR denitrification unit. The flue gas passes through the CO oxidation catalytic unit to catalytically oxidize the CO gas. The heat released by the reaction enters the GGH heat exchanger to supplement the heat of the flue gas. After the flue gas temperature rises, it enters the SCR denitrification unit for denitrification.

3. The SCR-CO coupling device for sintering machine according to claim 1, characterized in that: The CO oxidation catalytic unit is installed between the GGH heat exchanger and the hot blast furnace. The flue gas passes through the CO oxidation catalytic unit to catalytically oxidize the CO gas to form CO2. The reaction releases heat to supplement the hot blast furnace. The hot blast furnace heats the flue gas to 220-280°C to reach the reaction temperature of the SCR denitrification unit. After that, the flue gas enters the SCR denitrification system for reaction. After the reaction of the SCR denitrification unit, the heat is recovered and returned to the GGH heat exchanger to supplement the temperature of the hot blast furnace.

4. The SCR-CO coupling device for sintering machine according to claim 2 or 3, characterized in that: It also includes a first temperature monitoring unit arranged at the GGH heat exchanger, which is used to monitor the temperature of the flue gas in real time and adjust the operating conditions of the CO oxidation catalytic unit through a control algorithm to optimize the generation and utilization of heat and ensure that the flue gas temperature meets the requirements of the SCR denitrification unit. The control algorithm is adjusted based on the following formula: Among them, T out is the flue gas temperature at the outlet of the GGH heat exchanger, T in is the flue gas temperature at the inlet of the GGH heat exchanger, Q reaction is the heat released by the CO oxidation catalytic unit reaction, m gas is the mass flow rate of flue gas, c p is the specific heat capacity of the flue gas.

5. The SCR-CO coupling device for sintering machine according to claim 4, characterized in that: The specific monitoring steps of the first temperature monitoring unit are as follows: a. Collect the flue gas temperature data at the inlet and outlet of the GGH heat exchanger, the reaction heat data of the CO oxidation catalytic unit, the mass flow rate data of the flue gas and the specific heat capacity data of the flue gas; b. Process the collected data using neural networks or fuzzy logic to predict the temperature changes of flue gas under different operating conditions; c. Calculate the operating conditions of the CO oxidation catalytic unit that need to be adjusted based on the prediction results and the preset flue gas temperature setting value, including but not limited to the activity of the catalyst, the flow rate of the flue gas and the residence time of the flue gas; d. Through closed-loop control, the operating conditions of the CO oxidation catalytic unit, as well as the operating parameters of the GGH heat exchanger and hot air stove are adjusted in real time to ensure that the flue gas temperature is stable within the optimal reaction temperature range of the SCR denitrification unit; e. Adopt adaptive control strategy to automatically update control parameters according to environmental changes and equipment aging factors to maintain long-term stable operating performance.

6. The SCR-CO coupling device for sintering machine according to claim 2 or 3, characterized in that: It also includes a second temperature monitoring unit arranged at the hot blast stove, which is used to monitor the temperature of the flue gas in real time and adjust the operating conditions of the hot blast stove through a control algorithm to ensure that the flue gas temperature meets the requirements of the SCR denitrification unit. The control algorithm is adjusted based on the following formula: T out =f(T in ,Q reaction :m gas , c p ,ΔT set )in, T out is the flue gas temperature at the hot blast stove outlet, T in is the flue gas temperature at the hot blast stove inlet, Q reaction is the heat released by the CO oxidation catalytic unit reaction, m gas is the mass flow rate of flue gas, c p is the specific heat capacity of the flue gas, ΔT set is the preset temperature change value; function f represents the control strategy for dynamically adjusting the hot blast furnace operating conditions according to real-time data and preset parameters.

7. The SCR-CO coupling device for sintering machine according to claim 6, characterized in that: The specific monitoring steps of the second temperature monitoring unit are as follows: a. Use Kalman filter to filter noise and estimate state of collected flue gas temperature data to improve the accuracy of temperature measurement; b. Calculate the optimal operating parameters of the hot blast stove through the optimization algorithm based on the real-time monitored flue gas temperature and the preset control target; c. Input the calculated optimal operating parameters into the actuator to adjust the combustion process of the hot blast stove; d. Regularly update the parameters of the control model to adapt to the impact of equipment aging and environmental changes on system performance; e. Store and analyze historical operation data to continuously improve control strategies and enhance the system's adaptive capabilities.

8. The SCR-CO coupling device for sintering machine according to claim 2 or 3, characterized in that: The third temperature monitoring unit is also provided at the SCR denitration location for real-time monitoring of the temperature of the flue gas. The third temperature monitoring unit is used to monitor the temperature of the flue gas in real time and adjust the operating conditions of the SCR denitration unit through a control algorithm to ensure that the flue gas temperature is stable within the optimal temperature range of the denitration reaction. The control algorithm is adjusted based on the following formula: T out,SCR =f(T in,SCR ,Q reaction ,m gas ,c p ,ΔT set,SCR ) Among them, T out,SCR is the flue gas temperature at the outlet of the SCR denitrification unit, T in,SCR is the flue gas temperature at the inlet of the SCR denitrification unit, Q reaction is the heat released by the CO oxidation catalytic unit reaction, m gas is the mass flow rate of flue gas, c p is the specific heat capacity of flue gas, Δ Tset,SCR is the preset temperature change value of the SCR denitrification unit; function f represents the control strategy for dynamically adjusting the operating conditions of the SCR denitrification unit according to real-time data and preset parameters.

9. The SCR-CO coupling device for sintering machine according to claim 8, characterized in that: The specific monitoring steps of the third temperature monitoring unit are as follows: a. Collect the flue gas temperature data at the inlet and outlet of the SCR denitration unit, the reaction heat data of the CO oxidation catalytic unit, the mass flow rate data of the flue gas and the specific heat capacity data of the flue gas; b. Process the collected data using neural networks or fuzzy logic to predict the temperature changes of flue gas under different operating conditions; c. Calculate the operating conditions of the SCR denitration unit that need to be adjusted based on the prediction results and the preset flue gas temperature setting value, including but not limited to the activity of the catalyst, the flow rate of the flue gas and the residence time of the flue gas; d. Through closed-loop control, the operating conditions of the SCR denitrification unit are adjusted in real time to ensure that the flue gas temperature is stable within the optimal temperature range of the denitrification reaction; e. Adopt adaptive control strategy to automatically update control parameters according to environmental changes and equipment aging factors to maintain long-term stable operating performance.

10. A coupling process of the SCR-CO coupling device for a sintering machine according to any one of claims 1 to 9, comprising the following steps: Flue gas desulfurization: The sintering flue gas first enters the desulfurization unit, where the sulfur in the flue gas is removed; Flue gas dust removal: The flue gas after desulfurization enters the dust collector to remove dust particles in the flue gas; Flue gas preheating: The flue gas after dust removal is preheated through the GGH heat exchanger to increase the flue gas temperature; Further heating of flue gas: the preheated flue gas enters the hot air furnace and is further heated to meet the temperature requirements of the SCR denitrification reaction; CO catalytic oxidation: The heated high-temperature flue gas flows into the CO oxidation catalytic unit, where the CO gas in the flue gas undergoes a catalytic oxidation reaction under the action of the catalyst to generate CO2 and release heat; Heat recovery: The heat released by the CO oxidation catalytic unit is recovered to supplement the heating of flue gas by the GGH heat exchanger; Flue gas denitrification: Flue gas treated by the CO oxidation catalytic unit and carrying additional heat enters the SCR denitrification unit. Nitrogen oxides (NOx) in the flue gas are reduced to nitrogen and water under the action of the catalyst to achieve denitrification; Flue gas transportation: The flue gas after denitrification is transported by the fan and enters the chimney from the GGH heat exchanger. Flue gas emission: The treated clean flue gas is discharged into the atmosphere through the chimney to achieve clean emission of sintering flue gas. Temperature monitoring and control: The temperature monitoring units installed at the GGH heat exchanger, hot air stove and SCR denitrification unit monitor the flue gas temperature in real time, and adjust the operating conditions of the CO oxidation catalytic unit, hot air stove and SCR denitrification unit through the control algorithm to ensure that the flue gas temperature is stable within the optimal reaction range.

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