Volume-adjustable denitration reactor and low-temperature denitration catalyst measuring system and method

Abstract

The invention belongs to the technical field of performance evaluation of low-temperature denitration catalysts, and particularly relates to a volume-adjustable denitration reactor, a low-temperature denitration catalyst measuring system and a low-temperature denitration catalyst measuring method. The denitration reactor comprises a cylinder and a heating part arranged on the outer wall of the cylinder, and the upper part and the lower part of the cylinder are respectively provided with a gas inlet and a gas outlet; a supporting rod is fixed to the inner side of the bottom of the barrel, and a lining plate with the adjustable fixing position is arranged on the supporting rod. When in use, the fixed position of the lining plate on the supporting rod is adjusted, so that the central position of the catalyst bed layer positioned above the lining plate and the center of the heating part are positioned on the same level, the lining plate divides the barrel into an upper cavity and a lower cavity, and the upper cavity is a denitration reaction area. The movable lining plate is arranged in the denitration reactor, so that the volume change of denitration catalytic reaction can be realized by moving the lining plate in the use process, the catalyst to be tested is ensured to be always in the central position of a uniform temperature area, and the requirement of testing the low-temperature denitration catalyst in a relatively large air speed range is met.

Description

Technical Field

[0001] The invention belongs to the technical field of low-temperature denitration catalyst performance evaluation, and in particular relates to a denitration reactor with adjustable volume, and a low-temperature denitration catalyst measurement system and method. Background Art

[0002] With the full implementation of ultra-low emissions in the steel industry, the industry has basically completed the treatment of flue gas from the sintering process. The most common sintering flue gas denitrification process is the SCR denitrification process, which uses ammonia as a reducing agent to reduce NO in the sintering flue gas. x Under the action of SCR catalyst, it is reduced to N2. The catalyst in this process has high requirements for the reaction temperature. The catalytic temperature of the most common SCR denitrification catalyst is 280-320℃. x The treatment device is generally arranged after desulfurization. The flue gas temperature at this location is relatively low and cannot reach the temperature zone of the catalyst. Therefore, the flue gas needs to be heated up twice during actual operation, which will cause a lot of energy consumption. The development of low-temperature denitrification catalysts can enable the process technology to operate stably at a lower flue gas temperature, without the need to heat up the flue gas, which can effectively reduce the energy consumption of the denitrification process. At present, most low-temperature denitrification catalysts are still in the laboratory development stage, so accurate verification of denitrification capacity in the laboratory is of great significance to the development of catalysts.

[0003] At present, most of the domestic denitration catalyst reactors adopt a fixed bed design, which has the advantages of simple operation and convenient catalyst loading. However, all kinds of denitration catalyst evaluation devices are currently innovating in control, detection, process and other aspects, and no relevant innovative design has been carried out on the reactor itself. This leads to the limitation of traditional reactors during the catalyst loading process, and the catalyst cannot be directly placed in the constant temperature zone of the outer heating furnace. The current conventional practice in China is to fix the effective volume of the reactor, increase the length of the constant temperature heating furnace outside the reactor, so as to ensure that the catalyst is in the constant temperature zone, and then control the air velocity by adjusting the flow rate of the system. In the above method, each reactor has a fixed catalyst loading amount. When it exceeds the limit, the device cannot meet the test and the reactor needs to be redesigned. When the diameter of the reactor increases, there is a large diameter difference between the air inlet pipe and the reactor, which can easily cause gas flow segregation in the reactor and affect the test results. Summary of the invention

[0004] The purpose of the present invention is to address the defect in the prior art that the fixed volume of the denitration reactor is not conducive to the performance evaluation of different amounts of catalysts, and thus propose a denitration reactor with adjustable volume, a low-temperature denitration catalyst measurement system and method. The denitration reactor described in the present invention has a movable liner inside. In actual operation, the volume change of the denitration catalytic reaction can be achieved by moving the liner, so that the catalyst bed can be located in the center of the constant temperature zone of the outer heating furnace, thereby meeting the requirement that the low-temperature denitration catalyst can be tested within a larger space velocity range.

[0005] The first aspect of the present invention proposes a denitrification reactor with adjustable volume, which includes a cylinder and a heating component arranged on the outer wall of the cylinder, the upper and lower parts of the cylinder respectively have a gas inlet and a gas outlet; a support rod is fixed to the inner side of the bottom of the cylinder, and a lining plate with an adjustable fixed position is arranged on the support rod; when in use, the fixed position of the lining plate on the support rod is adjusted so that the center position of the catalyst bed above the lining plate is at the same level as the center of the heating component, and the lining plate divides the cylinder into two upper and lower cavities, and the upper cavity is the denitrification reaction zone.

[0006] Preferably, the lining plate is a disc structure having multiple layers of circular holes with gradually increasing inner diameters which are sequentially arranged from the inside to the outside.

[0007] Preferably, an air flow distribution fan is provided on the inner side of the top of the cylinder, and the air flow distribution fan is used to perform a first flow distribution on the air flow inside the cylinder.

[0008] More preferably, an airflow distribution baffle is provided below the airflow uniform distribution fan, and the airflow distribution baffle is located below the gas inlet, and the airflow distribution baffle is used for performing a second flow uniformity on the airflow inside the cylinder.

[0009] Further preferably, the air flow distribution baffle is provided with multiple layers of circular holes of uniform size.

[0010] The second aspect of the present invention proposes a low-temperature denitration catalyst measurement system, which includes the above-mentioned denitration reactor with adjustable volume, a mass flow meter and an exhaust gas online monitoring device; the denitration reactor is used to carry out a denitration reaction on the input ammonia and flue gas under the action of the denitration catalyst in the catalyst bed; the mass flow meter respectively measures the flow rate of ammonia and flue gas before entering the denitration reactor for the denitration reaction; the exhaust gas online monitoring device is used to detect the flue gas components after the denitration reaction in the denitration reactor.

[0011] Preferably, the system also includes a pressure sensor, a temperature sensor and a preheater, wherein the pressure sensor is used to measure the pressure inside the cylinder; the temperature sensor is used to measure the temperature inside the cylinder and the heating component; the preheater is located between the mass flow meter and the connecting pipe of the gas inlet, and the preheater is used to heat the flue gas before the denitrification reaction.

[0012] More preferably, the system further comprises a control unit, which is used to monitor and control the denitration reactor, mass flow meter, exhaust gas online monitoring device, pressure sensor, temperature sensor and preheater.

[0013] The third aspect of the present invention proposes a low-temperature denitration catalyst measurement method according to the above-mentioned system, the method comprising: adjusting the fixed position of the lining plate on the support rod so that the center position of the catalyst bed above the lining plate is at the same level as the center of the heating component, and adjusting the temperature of the heating component to the catalytic temperature; the ammonia gas and the flue gas before denitration are respectively measured for flow rate by the mass flow meter, and enter the interior of the cylinder from the gas inlet, the ammonia gas and the flue gas undergo a denitration reaction with the denitration catalyst in the catalyst bed, and the space velocity of the denitration reaction is adjusted according to the total flow rate of ammonia gas and flue gas before denitration and the amount of the denitration catalyst; the flue gas after denitration is discharged from the gas outlet and enters the exhaust gas online monitoring device, and the exhaust gas online monitoring device is used to detect the composition and content of the flue gas after denitration.

[0014] Preferably, the calculation formula for adjusting the space velocity of the denitration reaction according to the total flow of ammonia and flue gas before denitration and the amount of denitration catalyst is as follows:

[0015]

[0016] Where Q is the total flow rate of ammonia and flue gas before denitrification, L / min; H is the reaction space velocity, h -1 ; V is the volume of the denitration catalyst, mL.

[0017] The volume-adjustable denitration reactor, low-temperature denitration catalyst measurement system and method described in the present invention have at least the following beneficial effects:

[0018] (1) The denitration reactor of the present invention has a movable liner inside. During use, the volume change of the denitration catalytic reaction can be achieved by moving the liner, ensuring that the catalyst to be tested is always in the center of the uniform temperature zone, thereby meeting the requirement that the low-temperature denitration catalyst can be tested within a larger space velocity range. Therefore, compared with the traditional laboratory denitration reactor, the present invention uses a set of devices to achieve different amounts of catalyst performance evaluation, has strong operability, and has a high accuracy of measurement results;

[0019] (2) In the present invention, an air flow distribution fan is provided at the reactor inlet to ensure uniform distribution of internal air flow under the condition of a large inner diameter of the reactor, thereby avoiding problems such as flue gas segregation during the test and improving the accuracy of the measurement results. At the same time, the system of the present invention is equipped with an exhaust gas online monitoring device, which can directly calculate data such as the denitrification efficiency of the reaction process, thereby improving the measurement efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of a low-temperature denitration catalyst measurement system according to an embodiment of the present invention;

[0021] Figure 2 This is a schematic structural diagram of a liner plate according to an embodiment of the present invention;

[0022] Figure 3 It is a schematic structural diagram of an air flow distribution baffle according to an embodiment of the present invention;

[0023] Figure 4 The present invention is a flowchart of the use of a denitration reactor with adjustable volume according to one embodiment of the present invention.

[0024] Reference numerals

[0025] 1. Cylinder; 2. Heating component; 3. Support rod; 4. Lining plate; 5. Catalyst bed; 6. Air flow distribution fan; 7. Air flow distribution baffle; 8. Mass flow meter; 9. Exhaust gas online monitoring device; 10. Pressure sensor; 11. Temperature sensor; 12. Preheater; 13. Control unit; 14. Hollow tube; 15. Fiber cotton layer; 16. Central axis; 17. Baffle. DETAILED DESCRIPTION

[0026] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0027] The first aspect of the present invention provides a denitration reactor with adjustable volume, such as Figure 1 As shown, the denitration reactor includes a cylinder 1 and a heating component 2 arranged on the outer wall of the cylinder 1, and the upper and lower parts of the cylinder 1 are respectively provided with a gas inlet and a gas outlet; a support rod 3 is fixed to the inner side of the bottom of the cylinder 1, and a lining plate 4 with an adjustable fixed position is arranged on the support rod 3; when in use, the fixed position of the lining plate 4 on the support rod 3 is adjusted so that the center position of the catalyst bed 5 located above the lining plate 4 is at the same level as the center of the heating component 2, and the lining plate 4 divides the cylinder 1 into two upper and lower cavities, and the upper cavity is the denitration reaction zone.

[0028] In a specific embodiment of the denitration reactor of the present invention, the cylinder 1 has an upper sealing cover and a lower sealing cover, and the upper and lower ports of the cylinder 1 are both processed with threads matching the sealing covers for sealing the upper and lower sealing covers.

[0029] In a specific embodiment of the denitration reactor of the present invention, the heating component 2 is a heating sleeve, and a circular partition 17 is provided below the gas inlet of the cylinder 1, and the partition 17 is used to fix the cylinder 1 in the heating component 2 on the outside, and the heating component 2 is located between the gas inlet and the gas outlet. In this article, the heating sleeve is an annular openable and closable design, the heating sleeve is an electric heating design, and is provided with three-stage temperature control, and the three-stage temperature can be set separately, the temperature control range is 20 to 300°C, and a signal transmission function is provided, and the temperature parameters can be directly controlled by the control unit 13.

[0030] In a specific embodiment of the denitration reactor of the present invention, Figure 2 As shown, since the outer circle resistance is large and the inner circle resistance is small, the lining plate 4 is set to a disc structure with multiple layers of circular holes with gradually increasing inner diameters arranged in sequence from the inside to the outside, and the center of the lining plate 4 has a circular hole, which is used to connect the hollow tube 14. The tube wall of the hollow tube 14 is provided with a fixing nut. The inner diameter of the hollow tube 14 matches the outer diameter of the support rod 3. The hollow tube 14 is sleeved on the support rod 3; the support rod 3 penetrates the catalyst bed 5, the support rod 3 is welded to the lower sealing cover, and the top of the support rod 3 is located below the gas inlet. In the actual operation process, the position of the lining plate 4 on the support rod 3 is moved until the center position of the catalyst bed 5 above the lining plate 4 is at the same level as the center of the heating component 2, that is, the designated position is reached, and the volume change of the denitration catalytic reaction can be realized, and then the lining plate 4 is fixed to the support rod 3 by the fixing nut. In this article, the support rod 3 is a hollow design, and a thermocouple can be inserted in the middle to measure the temperature of the catalyst bed 5 inside the cylinder 1.

[0031] In a specific embodiment of the denitration reactor of the present invention, a rotatable central shaft 16 is provided on the inner side of the upper sealing cover of the cylinder 1, and the central shaft 16 is connected to the airflow uniform distribution fan 6, and the airflow uniform distribution fan 6 is located at the gas inlet. The airflow uniform distribution fan 6 is driven by the flue gas transported into the cylinder 1, and the gas flow rate inside the cylinder 1 can be used to achieve uniformity of the airflow inside the cylinder 1.

[0032] In a preferred embodiment of the denitration reactor of the present invention, an airflow distribution baffle 7 is provided below the airflow distribution fan 6, and the airflow distribution baffle 7 is located below the gas inlet, and the airflow distribution baffle 7 is used to perform secondary flow distribution on the airflow inside the cylinder 1. Specifically, Figure 3 As shown, the airflow distribution partition 7 is provided with multiple layers of circular holes of uniform size, which is more conducive to the uniformity of airflow.

[0033] In a specific embodiment of the denitration reactor of the present invention, when the catalyst in the catalyst bed 5 is in powder form, it is necessary to lay a layer of refractory fiber cotton layer 14 on the liner 4 and compact the fiber cotton layer 14 to ensure that the powdered catalyst can stay in the middle position between the liner 4 and the cylinder 1; the powdered catalyst should be slightly flattened after loading, and then cover the catalyst bed 5 with another layer of refractory fiber cotton layer 14 for sealing.

[0034] The second aspect of the present invention proposes a low-temperature denitration catalyst measurement system, which includes the above-mentioned denitration reactor with adjustable volume, a mass flowmeter 8 and an exhaust gas online monitoring device 9; the denitration reactor is used to carry out a denitration reaction on the input ammonia and flue gas under the action of the denitration catalyst in the catalyst bed 5; the mass flowmeter 8 respectively measures the flow rates of ammonia and flue gas before entering the denitration reactor for the denitration reaction; the exhaust gas online monitoring device 9 is used to detect the flue gas components after the denitration reaction in the denitration reactor.

[0035] In a specific embodiment of the system of the present invention, the denitration catalyst may be a honeycomb denitration catalyst, a granular denitration catalyst or a powdered denitration catalyst.

[0036] In a specific embodiment of the system of the present invention, the mass flow meter 8 is directly connected to the gas path after decompression. The mass flow meter 8 is corrosion-resistant to prevent ammonia, NO x The range of the gas corrosion is (0~10L / min). Specifically, in this article, Figure 1 As shown, ammonia enters from gas path 1 and passes through mass flowmeter 8 to measure the ammonia flow rate, flue gas enters from gas path 2 and passes through mass flowmeter 8 to measure the flue gas flow rate, and ammonia and flue gas merge and enter the cylinder 1 from the gas inlet.

[0037] In a specific embodiment of the system of the present invention, the exhaust gas online monitoring device 9 is connected to the gas outlet. The exhaust gas online monitoring device 9 is mainly a flue gas analyzer, which has the function of detecting NO in the flue gas. x , NH3, O2 and SO2, etc., with a measuring range of 0 to 1000 mg / m 3 .

[0038] In a specific embodiment of the system of the present invention, the system further comprises a pressure sensor 10, a temperature sensor 11 and a preheater 12, wherein the pressure sensor 10 is used to measure the pressure inside the cylinder 1; the temperature sensor 11 is used to measure the temperature inside the cylinder 1 and the heating component 2, specifically, as Figure 1 As shown, a temperature sensor 11 is provided at the bottom of the cylinder 1, and the temperature sensor 11 is used to measure the temperature inside the cylinder 1, mainly detecting the temperature of the catalyst bed. The heating component 2 is provided with three-stage temperature control, which has been explained in the previous text and will not be repeated here. Three temperature sensors 11 are provided at the three-stage temperature control of the heating component 2, respectively measuring the temperatures at the three-stage temperature control, in order to perform temperature monitoring for feedback control of the control unit 13; the preheater 12 is located between the mass flow meter 8 in the gas path 2 and the connecting pipe of the gas inlet, and the preheater 12 is used to heat the flue gas before the denitrification reaction.

[0039] In this article, the pressure sensor 10 is a digital pressure sensor with a measuring range of (-0.1~

[0040] 100kPa), the minimum response signal is 1Pa, the response time is ≤10ms, and the pressure signal is directly transmitted to the control unit 13, which can monitor and display the pressure changes inside the cylinder 1 in real time.

[0041] In this article, the temperature sensor 11 is a K-type armored thermocouple with a measuring range of (0-500°C) and a minimum response signal of 0.1°C. The thermocouple signal is directly transmitted to the control unit 13, which can monitor and display the temperature of the preheater 12, the temperature of each section of the heating component 2 and the temperature inside the cylinder 1 in real time.

[0042] In this article, the preheater 12 is an electric heating design, which can achieve the heating of the reaction gas in the temperature range of (20-300°C). The preheater 12 is equipped with signal input and output, which can be connected to the control unit 13 and controlled by the control unit 13.

[0043] The specific operation process of the low-temperature denitration catalyst measurement system of the present invention is as follows: S01: Before conducting the test, the dosage of the denitration catalyst to be tested must be determined first, and the weight and volume of the denitration catalyst must be measured and recorded using an analytical balance; S02: Open the lower sealing cover of the cylinder 1, take out the lining plate 4 on the support rod 3 welded to the lower sealing cover, and remove the residual catalyst inside the cylinder 1; S03: Determine the fixed position of the lining plate 4 according to the volume of the catalyst and the inner diameter of the cylinder 1, and use the fastening screws to fix the lining plate 4 on the support rod 3 to ensure that the denitration catalyst to be tested is in the middle position of the constant temperature zone of the heating component 2 (heating sleeve) outside the cylinder 1; S04: Determine the method of loading the catalyst inside the cylinder 1 according to the type of the denitration catalyst to be tested. When the denitration catalyst to be tested is in powder form, it is necessary to lay a layer of refractory fiber cotton layer 15 on the lining plate 4 and press it. S05: install the support rod 3 with liner 4 into the cylinder 1, and tighten the lower sealing cover; open the upper sealing cover, remove the airflow distribution fan 6 and airflow distribution baffle 7 in the cylinder 1, and load the denitration catalyst to be tested from the upper part of the cylinder 1; S06: replace the airflow distribution fan 6 and airflow distribution baffle 7 on the upper part of the cylinder 1, tighten the upper sealing cover, and connect the supporting pipelines of the cylinder 1; S07: perform an airtightness check on the cylinder 1. If the airtightness check of the cylinder 1 fails, the dew point position needs to be checked and repaired until it passes the airtightness check; when the cylinder 1 passes the airtightness check, the catalyst loading work and the preliminary equipment preparation work are completed, and the test is ready to start.

[0044] The third aspect of the present invention proposes a low-temperature denitration catalyst measurement method according to the above-mentioned system, the method comprising: adjusting the fixed position of the lining plate 4 on the support rod 3 so that the center position of the catalyst bed 5 located above the lining plate 4 is at the same level as the center of the heating component 2, and adjusting the temperature of the heating component 2 to the catalytic temperature; the ammonia gas and the flue gas before denitration are respectively measured for flow rate by the mass flow meter 8, and enter the interior of the cylinder 1 from the gas inlet, the ammonia gas and the flue gas undergo a denitration reaction with the denitration catalyst in the catalyst bed 5, and the air velocity of the denitration reaction is adjusted according to the total flow rate of the ammonia gas and the flue gas before denitration and the amount of the denitration catalyst; the flue gas after denitration is discharged from the gas outlet and enters the exhaust gas online monitoring device 10, and the exhaust gas online monitoring device 10 is used to detect the composition and content of the flue gas after denitration.

[0045] In a specific embodiment of the method of the present invention, during the denitration reaction, the temperature inside the cylinder 1 and the heating component 2 is measured by the temperature sensor 9, and the heating component 2 is adjusted to the catalytic temperature in real time.

[0046] In a specific embodiment of the method of the present invention, the calculation formula for adjusting the space velocity of the denitration reaction according to the total flow rate of ammonia and flue gas before denitration and the amount of denitration catalyst is as follows:

[0047]

[0048] Where Q is the total flow rate of ammonia and flue gas before denitrification, L / min; H is the reaction space velocity, h -1 ; V is the volume of the denitration catalyst, mL.

[0049] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A denitration reactor with adjustable volume, characterized in that: The denitration reactor comprises a cylinder (1) and a heating component (2) arranged on the outer wall of the cylinder (1), and the upper part and the lower part of the cylinder (1) are respectively provided with a gas inlet and a gas outlet; A support rod (3) is fixed to the inner side of the bottom of the cylinder (1), and a lining plate (4) with an adjustable fixed position is arranged on the support rod (3); When in use, the fixed position of the lining plate (4) on the support rod (3) is adjusted so that the center position of the catalyst bed (5) located above the lining plate (4) is at the same level as the center of the heating component (2), and the lining plate (4) divides the cylinder (1) into two upper and lower cavities, the upper cavity being the denitration reaction zone.

2. The volume-adjustable denitration reactor according to claim 1, characterized in that: The lining plate (4) is a disc structure having multiple layers of circular holes with gradually increasing inner diameters which are arranged in sequence from the inside to the outside.

3. The volume-adjustable denitration reactor according to claim 1, characterized in that: An air flow distribution fan (6) is arranged on the inner side of the top of the cylinder (1), and the air flow distribution fan (6) is used to perform a first flow distribution on the air flow inside the cylinder (1).

4. The volume-adjustable denitration reactor according to claim 3, characterized in that: An airflow distribution baffle (7) is provided below the airflow distribution fan (6), and the airflow distribution baffle (7) is located below the gas inlet. The airflow distribution baffle (7) is used to perform a second flow equalization on the airflow inside the cylinder (1).

5. The volume-adjustable denitration reactor according to claim 4, characterized in that: The airflow distribution baffle (7) is provided with multiple layers of circular holes of uniform size.

6. A low-temperature denitration catalyst measurement system, characterized in that: The system comprises a denitration reactor with adjustable volume as claimed in any one of claims 1 to 5, a mass flow meter (8) and an online tail gas monitoring device (9); The denitration reactor is used to carry out a denitration reaction on the input ammonia and flue gas under the action of the denitration catalyst in the catalyst bed (5); The mass flow meter (8) respectively measures the flow rates of ammonia and flue gas before entering the denitration reactor for denitration reaction; The exhaust gas online monitoring device (9) is used to detect the components of the flue gas after the denitration reaction in the denitration reactor.

7. The low-temperature denitration catalyst measurement system according to claim 6, characterized in that: The system further comprises a pressure sensor (10), a temperature sensor (11) and a preheater (12), wherein the pressure sensor (10) is used to measure the pressure inside the cylinder (1); The temperature sensor (11) is used to measure the temperature inside the barrel (1) and the heating component (2); The preheater (12) is located between the mass flow meter (8) and the connecting pipe of the gas inlet, and the preheater (12) is used to heat the flue gas before the denitration reaction.

8. The low-temperature denitration catalyst measurement system according to claim 7, characterized in that: The system further comprises a control unit (13), wherein the control unit (13) is used to monitor and control the denitration reactor, the mass flow meter (8), the tail gas online monitoring device (9), the pressure sensor (10), the temperature sensor (11) and the preheater (12).

9. A method for measuring a low-temperature denitration catalyst according to any one of claims 6 to 8, characterized in that: The method comprises: adjusting the fixing position of the lining plate (4) on the support rod (3) so that the center position of the catalyst bed (5) located above the lining plate (4) is at the same level as the center of the heating component (2), and adjusting the temperature of the heating component (2) to the catalytic temperature; The ammonia gas and the flue gas before denitration are measured for flow rate by the mass flow meter (8) respectively, and enter the interior of the cylinder (1) from the gas inlet, and the ammonia gas and the flue gas undergo a denitration reaction with the denitration catalyst in the catalyst bed (5), and the space velocity of the denitration reaction is adjusted according to the total flow rate of the ammonia gas and the flue gas before denitration and the amount of the denitration catalyst; The flue gas after denitration is discharged from the gas outlet and enters the exhaust gas online monitoring device (10), and the exhaust gas online monitoring device (10) is used to detect the composition and content of the flue gas after denitration.

10. The low-temperature denitration catalyst measurement method according to claim 9, characterized in that: The calculation formula for adjusting the space velocity of the denitration reaction according to the total flow of ammonia and flue gas before denitration and the amount of denitration catalyst is as follows: Where Q is the total flow rate of ammonia and flue gas before denitrification, L / min; H is the reaction space velocity, h -1 ; V is the volume of the denitration catalyst, mL.

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