CN212410533U - Flat plate type denitration catalyst activity detection system - Google Patents
Flat plate type denitration catalyst activity detection system Download PDFInfo
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- CN212410533U CN212410533U CN202021609003.2U CN202021609003U CN212410533U CN 212410533 U CN212410533 U CN 212410533U CN 202021609003 U CN202021609003 U CN 202021609003U CN 212410533 U CN212410533 U CN 212410533U
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Abstract
The utility model provides a flat denitration catalyst activity detecting system. The detection system includes: the gas supply unit comprises more than two gas storage devices; the gas distribution unit comprises a control valve arranged at the outlet end of each gas storage device; the reaction unit comprises a reaction device and a heating device, and the reaction device is connected with the gas distribution unit and is provided with a reaction cavity for accommodating the flat-plate denitration catalyst; the analysis unit comprises a sampling device and a detection device, the sampling device is provided with a first sampling port and a second sampling port which are respectively communicated with the front end and the rear end of the flat-plate denitration catalyst, and the detection device is communicated with the outlet end of the sampling device; and the control unit can control the air distribution unit according to the information fed back by the analysis unit. The utility model discloses a detecting system simple structure, low cost, good reproducibility, suitability are strong, and its accuracy and comparability that can ensure the testing result when detecting the activity of flat denitration catalyst.
Description
Technical Field
The utility model belongs to the technical field of the flue gas denitration technique and specifically relates to a flat denitration catalyst activity detecting system is related to.
Background
Selective catalytic oxidation reduction (SCR) is the most widely used technology for flue gas denitration in coal-fired power plants, and a catalyst is the core of the SCR technology. At present, the types of commercial SCR catalysts mainly include flat plate type and honeycomb type, and the main active component is vanadium pentoxide, molybdenum trioxide or tungsten trioxide is used as an auxiliary agent, and titanium dioxide is used as a carrier.
The activity of the catalyst directly determines the denitration performance and is an essential parameter for SCR design, so that the activity value needs to be strictly limited and controlled in the production and use processes of a fresh catalyst. In addition, the activity value generally decreases gradually along with the increase of the operation time, so that the activity of the catalyst of the denitration system of the power plant needs to be tested regularly (every half year or one year), and a scheme for loading, reloading or regenerating the catalyst is formulated according to the activity reduction trend of the catalyst so as to ensure the safe and stable operation of the unit.
The existing miniature flue gas denitration catalyst activity detection devices mainly comprise two types, one type is designed for detecting the denitration performance of a catalyst powder sample, and the miniature flue gas denitration catalyst activity detection device is suitable for improving the formula of a catalyst by a research and development organization, but is not suitable for activity detection of a catalyst finished product; the other is an activity detection design aiming at the blocky honeycomb catalyst, which can be used for quality control and research and development tests of honeycomb catalyst production products, but has the problems of low accuracy and repeatability of results and the like in the activity test of the flaky flat-plate catalyst. In addition, a pilot plant is usually adopted for detecting the activity of the flat-plate type flue gas denitration catalyst, and due to the defects of large system, complex structure, long test time, high test cost and the like, the pilot plant is not beneficial to quality control of produced products, research and development tests and other tests of a large amount of samples.
Therefore, a miniature flat plate type denitration catalyst activity detection device with simple structure, low cost, good repeatability and strong applicability needs to be developed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a flat denitration catalyst activity detecting system, this detecting system can ensure the accuracy and the comparability of testing result when detecting flat denitration catalyst's activity.
The utility model provides a flat denitration catalyst activity detecting system, include:
the gas supply unit comprises more than two gas storage devices;
the gas distribution unit comprises a control valve which is arranged at the outlet end of each gas storage device and used for regulating the flow of each gas;
the reaction unit comprises a reaction device and a heating device for heating the reaction device, and the reaction device is connected with the gas distribution unit and is provided with a reaction cavity for accommodating the flat-plate denitration catalyst;
the analysis unit comprises a sampling device and a detection device for detecting gas composition, wherein the sampling device is provided with a first sampling port and a second sampling port which are respectively communicated with the front end and the rear end of the flat-plate denitration catalyst in the reaction cavity, and the detection device is communicated with the outlet end of the sampling device;
and the control unit is electrically connected with the gas distribution unit and the analysis unit respectively, and can control the gas distribution unit according to the information fed back by the analysis unit so as to adjust the flow of each gas.
Further, the gas supply unit comprises a first gas storage device for storing nitrogen, a second gas storage device for storing oxygen, a third gas storage device for storing nitrogen oxides and a fourth gas storage device for storing ammonia.
Furthermore, the gas distribution unit also comprises a pressure regulating valve arranged at the outlet end of each gas storage device for regulating the gas pressure, a flowmeter arranged at the outlet end of each gas storage device for detecting the gas flow, and a total flowmeter arranged at the total outlet end of each gas storage device for detecting the total flow of each gas, wherein the pressure regulating valve, the flowmeters and the total flowmeter are respectively and electrically connected with the control unit.
Further, flat denitration catalyst activity detecting system still includes the preprocessing unit who sets up between gas supply unit and reaction unit, and preprocessing unit includes the mixing arrangement that is used for carrying on gas mixing and the preheating device that is used for preheating the gas, heating device and preheating device respectively with the control unit electric connection.
Further, the mixing device is an annular coil, and the pre-heating device is a radiation heating shell arranged outside the mixing device.
Furthermore, the reaction device is a horizontal reactor, at least one concave clamping groove for fixing the flat plate type denitration catalyst is arranged in a reaction cavity of the reaction device, a sample loading port is arranged on the side wall of the reaction device, a flange cover is arranged on the sample loading port, and a sealing gasket is arranged between the flange cover and the sample loading port.
Furthermore, a first temperature sensor for detecting the gas temperature at the front end of the flat-plate denitration catalyst, a second temperature sensor for detecting the gas temperature at the rear end of the flat-plate denitration catalyst, a pressure sensor for detecting the gas pressure and a manual valve for controlling the gas pressure are arranged on the reaction device, and the first temperature sensor, the second temperature sensor and the pressure sensor are respectively and electrically connected with the control unit.
Further, the analysis unit further comprises a filter arranged between the sampling device and the detection device.
Further, the sampling device is a three-way electromagnetic valve, and the detection device comprises a Fourier transform infrared analyzer and an oxygen detection device for detecting the oxygen content.
Further, the flat plate type denitration catalyst activity detection system further comprises a tail gas treatment unit arranged at the outlet end of the reaction unit, and the tail gas treatment unit comprises an acidic adsorption tank for adsorbing and treating ammonia gas and an alkaline adsorption tank for adsorbing and treating nitrogen oxides.
The flat plate type denitration catalyst activity detection system of the utility model can accurately allocate the flow proportion of each gas component through the control device according to the data feedback recorded in real time by the flue gas analysis unit, thereby ensuring the accuracy of the data to the maximum extent; the flat plate type denitration catalyst activity detection system standardizes the detection process, unifies the detection method, equipment and detection conditions, ensures comparability of detection results, and has the characteristics of simple operation, low cost, good repeatability, strong applicability and the like; in addition, the activity detection system and the method for the flat plate type denitration catalyst can quickly, economically and accurately monitor and test the activity of a production sample and a research and development sample, distinguish the performance difference of catalysts with different formulas or the quality control of the same batch of catalyst products, and can detect the activity of in-service products, thereby providing data support for the establishment of a catalyst loading, reloading or regeneration management scheme for a power plant according to the activity reduction trend, meeting the production quality monitoring and research and development test of the flat plate type catalyst, and tracking and detecting the after-sale performance of the in-service catalyst.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a flat plate type denitration catalyst activity detection system according to an embodiment of the present invention.
Description of reference numerals:
1: an air supply unit; 11: a first gas storage device; 12: a second gas storage device; 13: a third gas storage device; 14: a fourth gas storage device;
2: a gas distribution unit; 201: a first pressure regulating valve; 202: a second pressure regulating valve; 203: a third pressure regulating valve; 204: a fourth pressure regulating valve; 205: a first solenoid valve; 206: a second solenoid valve; 207: a third electromagnetic valve; 208: a fourth solenoid valve; 209: a first flow meter; 210: a second flow meter; 211: a third flow meter; 212: a fourth flow meter; 213: a total flow meter;
3: a pre-processing unit; 31; a mixing device; 32: a preheating device;
4: a reaction unit; 41: a reaction device; 42; a heating device; 43: a first temperature sensor; 44: a second temperature sensor; 45: a pressure sensor; 46: a manual valve;
5: an analysis unit; 51: a sampling device; 52: a filter; 53: a Fourier transform infrared analyzer; 54: an oxygen detection device;
6: a tail gas treatment unit; 61: an acidic adsorption tank; 62: an alkaline adsorption tank;
7: a control unit.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, the utility model provides a flat denitration catalyst activity detecting system, include: the gas supply unit 1 comprises more than two gas storage devices; the gas distribution unit 2 comprises a control valve which is arranged at the outlet end of each gas storage device and used for regulating the flow of each gas; the reaction unit 4 comprises a reaction device 41 and a heating device 42 for heating the reaction device 41, wherein the reaction device 41 is connected with the gas distribution unit 2 and is provided with a reaction cavity for accommodating the flat-plate denitration catalyst; the analysis unit 5 comprises a sampling device 51 and a detection device for detecting gas composition, wherein the sampling device 51 is provided with a first sampling port and a second sampling port which are respectively communicated with the front end and the rear end of the flat-plate denitration catalyst in the reaction cavity, and the detection device is communicated with the outlet end of the sampling device 51; and the control unit 7 is electrically connected with the gas distribution unit 2 and the analysis unit 5 respectively, and the control unit 7 can control the gas distribution unit 2 to adjust the flow of each gas according to the information fed back by the analysis unit 5.
The utility model discloses an air supply unit 1 is used for providing the multiple gas that is used for generating simulation flue gas, including but not limited to nitrogen gas, oxygen, nitrogen oxide, ammonia etc. can rationally confirm according to the actual demand, generates the simulation flue gas promptly after the multiple gas mixes.
In one embodiment, the gas supply unit 1 includes a first gas storage device 11, a second gas storage device 12, a third gas storage device 13 and a fourth gas storage device 14, and the structure of each gas storage device is not limited strictly, and for example, a conventional device such as a steel cylinder may be used for gas storage. The first gas storage device 11 is a nitrogen gas steel cylinder and is used for generating and simulating nitrogen gas in the flue gas and other gases which do not participate in reaction; the second gas storage device 12 is an oxygen steel cylinder and is used for generating oxygen in the simulated smoke; the third gas storage device 13 is a nitrogen oxide steel cylinder and is used for generating and simulating nitrogen oxide in the flue gas; the fourth gas storage device 14 is an ammonia gas cylinder, and is used for generating ammonia gas in the simulated flue gas.
The utility model discloses in, distribution unit 2 is used for carrying out the accurate regulation and control to the gas supply pressure of the multiple gas that gas supply unit 1 provided, flow isoparametric, can rationally set up according to the actual demand. In addition to the above control valves, the gas distribution unit 2 may further include a pressure regulating valve disposed at an outlet end of each gas storage device to regulate gas pressure, a flow meter disposed at an outlet end of each gas storage device to detect a gas flow rate, and a total flow meter 213 disposed at a total outlet end of the gas storage devices to detect a total flow rate of each gas, wherein the pressure regulating valve, the flow meter, and the total flow meter 213 are electrically connected to the control unit 7, respectively. In the above setting mode, the gas distribution unit 2 mixes and configures the nitrogen gas, the oxygen gas, the nitrogen oxide and the ammonia gas in order to generate the simulated flue gas, and the total flow meter 213 precisely controls the total flow of the simulated flue gas.
More specifically, the gas distribution unit 2 includes: a first pressure regulating valve 201, i.e., a nitrogen pressure regulating valve, for regulation of nitrogen gas supply pressure; a second pressure regulating valve 202, i.e., an oxygen pressure regulating valve, for regulation of oxygen supply pressure; a third pressure regulating valve 203, i.e., a nitrogen oxide pressure regulating valve, for regulation of nitrogen oxide supply pressure; a fourth pressure regulating valve 204, i.e., an ammonia gas pressure regulating valve, for regulation of the ammonia gas supply pressure; a first solenoid valve 205, namely a nitrogen solenoid valve, for regulation of the opening and closing of the nitrogen line; a second solenoid valve 206, an oxygen solenoid valve, for regulation of oxygen line opening and closing; a third solenoid valve 207, i.e., a nitrogen oxide solenoid valve, for regulation of opening and closing of the nitrogen oxide line; a fourth solenoid valve 208, i.e., an ammonia solenoid valve, for adjustment of opening and closing of the ammonia line; a first flow meter 209, i.e., a nitrogen gas flow meter, for adjustment of the nitrogen gas flow rate; a second flow meter 210, i.e. an oxygen flow meter, for regulation of the oxygen flow; a third flow meter 211, i.e. a nitrogen oxide flow meter, for the regulation of the nitrogen oxide flow rate; a fourth flow meter 212, i.e., an ammonia gas flow meter, for adjustment of the flow rate of ammonia gas; and a total flow meter 213 for testing the total flue gas flow.
Under the above setting mode, the gas circuit connection mode of nitrogen gas is: the outlet of the first gas storage device 11 is connected with the first pressure regulating valve 201, and the stability of the gas pressure in the testing process is ensured through pressure regulation; the first electromagnetic valve 205 is respectively connected with the first pressure regulating valve 201 and the first flowmeter 209, the first electromagnetic valve 205 is opened before the test, and the first electromagnetic valve 205 is disconnected after the test is finished, so that the gas consumption can be effectively saved, and the test cost can be reduced. The gas path connection mode of other three gases is basically consistent with that of nitrogen, and the pressure regulation range of each gas path is 0.3-0.5 MPa. Meanwhile, the outlets of the first flowmeter 209, the second flowmeter 210, the third flowmeter 211 and the fourth flowmeter 212 are converged and connected with a total flowmeter 213, and the total flow range is 1-3Nm3/h。
The utility model discloses a flat denitration catalyst activity detecting system can also be including setting up the preprocessing unit 3 between air feed unit 1 and reaction unit 4, preprocessing unit 3 including the mixing arrangement 31 that is used for carrying on gas mixing and the preheating device 32 that is used for preheating the gas, heating device 42 and preheating device 32 respectively with the 7 electric connection of the control unit. The specific structure of the mixing device 31 and the preheating device 32 is not limited, and the structure conventional in the art can be adopted; specifically, the mixing device 31 may employ an annular coil, and the preheating device 32 may employ a radiation heating housing disposed outside the annular coil. The pretreatment unit 3 is used for pretreating mixed flue gas at the outlet of the gas distribution unit 2, and can simultaneously realize the functions of gas mixing and preheating, wherein the preheating temperature range can be 50-400 ℃.
The reaction device 41 is used for performing a denitration reaction of flue gas, the specific structure of the reaction device 41 is not strictly limited, for example, the reaction device may be a horizontal reactor, at least one concave slot for fixing a flat-plate denitration catalyst may be arranged in a reaction chamber of the reaction device 41, the number of the concave slots is not strictly limited, for example, the number of the concave slots may be 5, and the concave slots may be arranged between the front end and the rear end of the reaction chamber at intervals. The arrangement mode can realize the detection of the flat catalyst finished product and ensure the repeatability of the catalyst activity detection.
Further, a sample loading port is provided in a side wall of the reaction apparatus 41, a flange cover is provided in the sample loading port, and a gasket, such as a graphite gasket, is provided between the flange cover and the sample loading port. The setting mode has a good sealing effect, the loading and unloading of the flat plate type denitration catalyst of the sample are facilitated, and the operation is more convenient and safer.
The heating device 42 is used for heating the reaction device 41, and the arrangement mode is not strictly limited; specifically, the heating device 42 may be disposed outside the reaction device 41, and the heating manner of the reaction device 41 may be, for example, a conventional heating manner such as radiation heating or cladding heating. In one embodiment, the heating device 42 is a copper-cast heating structure, and the heating temperature thereof may be 50-500 ℃.
The utility model discloses in, be equipped with the first temperature sensor 43 that is used for detecting flat denitration catalyst front end gas temperature, the second temperature sensor 44 that is used for detecting flat denitration catalyst rear end gas temperature, the pressure sensor 45 that is used for detecting gas pressure and the manual valve 46 that is used for controlling gas pressure on reaction unit 41, first temperature sensor 43, second temperature sensor 44 and pressure sensor 45 respectively with the control unit 7 electric connection. The first temperature sensor 43 is used for testing the actual temperature of the flue gas before reaction, the second temperature sensor 44 is used for testing the actual temperature of the flue gas after reaction, in the testing process, the temperature before and after reaction should reach the target temperature simultaneously, and the precision of the temperature before and after reaction is controlled to be +/-1 ℃; the manual valve 46 further controls the gas pressure by adjusting the opening degree, and the pressure of the reaction unit 4 may be 0.1-0.15 MPa.
In the analysis unit 5, the sampling device 51 may be a three-way electromagnetic valve, and the three-way electromagnetic valve is respectively connected to the front end and the rear end of the catalyst loading position inside the reaction unit 4 through a pipeline, that is, before and after the reaction, the three-way electromagnetic valve can be switched to control and extract the flue gas before or after the reaction. Through three-way solenoid valve switching connection analytical element 5, can realize the detection analysis of the flue gas component before the reaction with after the reaction fast, guarantee the precision that catalyst activity detected.
The analysis unit 5 further comprises a filter 52 disposed between the sampling device 51 and the detection device, and when the extracted flue gas passes through the filter 52, the filter 52 can filter and remove impurities such as dust in the flue gas, and then the flue gas is introduced into the detection device for detection. The filter 52 is provided to ensure the accuracy of the detection and prolong the service life of the detection device.
The detection device comprises a Fourier transform infrared analyzer 53 and an oxygen detection device 54 for detecting the oxygen content; the fourier transform infrared analyzer 53 can analyze the content of nitrogen oxides (nitrogen oxides, nitrogen dioxide, nitrous oxide) and ammonia gas in the flue gas at one time, and the oxygen detection device 54 can analyze the content of oxygen in the flue gas.
The flat plate type denitration catalyst activity detection system of the utility model also comprises a tail gas treatment unit 6 arranged at the outlet end of the reaction unit 4, wherein the tail gas treatment unit 6 comprises an acidic adsorption tank 61 for adsorbing and treating ammonia gas and an alkaline adsorption tank 62 for adsorbing and treating nitrogen oxide; the adsorbent filled in the acidic adsorption tank 61 and the basic adsorption tank 62 is not strictly limited, and an adsorbent conventional in the art, such as SDG adsorbent, may be used. The tail gas treatment unit 6 can adsorb nitrogen oxides and ammonia in the flue gas, thereby avoiding environmental pollution.
The utility model discloses a control unit 7 mainly used flat flue gas denitration catalyst activity detecting system's control and regulation, including the flow of distribution unit 2 and the control and the regulation of simulation flue gas component, 3 temperature's of pretreatment unit regulation and control, reactor heating device 42 temperature's regulation and control, first temperature sensor 43, second temperature sensor 44, pressure sensor 45, 5 test parameter's of analytical element detection, show etc, this the flow proportion of each gas component of real-time record data accurate allotment that this the control unit 7 can be according to 5 feedbacks of analytical element, thereby the accuracy of detection data has been guaranteed to the at utmost.
The flat plate type denitration catalyst activity detection system of the utility model can accurately allocate the flow proportion of each gas component through the control unit 7 according to the data feedback recorded in real time by the flue gas analysis unit 5, thereby ensuring the accuracy of the data to the maximum extent; meanwhile, the flat plate type denitration catalyst activity detection system and method standardize the detection process, unify the detection method, equipment and detection conditions, ensure the comparability of the detection result, and have the characteristics of simple operation, low cost, good repeatability, strong applicability and the like; in addition, the activity detection system of the flat plate type denitration catalyst can quickly, economically and accurately monitor and test the activity of a production sample and a research and development sample, distinguish the performance difference of catalysts with different formulas or the quality control of the same batch of catalyst products, and detect the activity of in-service products, thereby providing data support for formulating a catalyst loading, reloading or regenerating management scheme for a power plant according to the activity reduction trend, meeting the production quality monitoring and research and development test of the flat plate type catalyst, and simultaneously tracking and detecting the after-sale performance of the in-service catalyst.
The operation process of detecting by using the flat plate type denitration catalyst activity detection system is as follows:
1. sample preparation:
five samples with the width of 22mm and the length of 150mm are cut from the flat plate type flue gas denitration catalyst single plate, the size of the sample is measured and recorded before the sample is loaded, and the surface speed AV is calculated according to the detection conditions.
2. Sample loading and unloading:
and (3) detaching the flange cover and the sealing gasket of the reaction device 41, vertically installing the five test sample wafers into the reaction device 41 along the concave clamping groove, and then installing the flange cover and the sealing gasket to finish the installation of the flat plate type denitration catalyst test sample wafer.
3. Gas supply:
first, the first gas storage means 11 adjusts the pressure of nitrogen gas to 0.3 to 0.5MPa by the first pressure adjusting valve 201, opens the first electromagnetic valve 205 by the control unit 7, and adjusts the first flow meter 209 to introduce the amount of nitrogen gas required for the test, thereby performing the airtightness test.
Then, the control unit 7 opens the second, third and fourth gas storage devices 12, 13 and 14, and adjusts the second, third and fourth pressure regulating valves 202, 203 and 204 to make the supply pressures of the respective channels in the range of 0.3-0.5 MPa.
4. And (3) working condition adjustment:
the temperatures of the preheating device 32 and the heating device 42 are input and regulated in the control unit 7. And in the temperature rising process, the nitrogen is continuously introduced to keep the uniformity of the temperature field. When the test temperatures of the first temperature sensor 43 and the second temperature sensor 44 reach 300 ℃ or higher, the second electromagnetic valve 206, the third electromagnetic valve 207, and the fourth electromagnetic valve 208 are sequentially opened in the control unit 7 on the premise of ensuring that the total flow meter 213 is the target flow rate, and theoretically required flow rates of the second flow meter 210, the third flow meter 211, and the fourth flow meter 212 are sequentially set. And switching the three-way electromagnetic valve to sample the flue gas before reaction, sending the flue gas to an analysis unit 5 for detection and analysis, and performing feedback adjustment on each flowmeter according to the actual concentration or content of the oxygen, the nitrogen oxide and the ammonia until the actual concentration or content is a target value. And finally, when the temperatures of the catalyst measured by the first temperature sensor 43 and the second temperature sensor 44 in the reaction unit 4 before and after the reaction reach the target temperature at the same time, switching the three-way electromagnetic valve to sample and analyze the flue gas after the reaction is stabilized for half an hour, and reading parameters and completing the test after the concentrations or the contents of the components in the flue gas after the reaction are stabilized for half an hour.
5. And (3) activity calculation:
the reading is carried out in the test process, and the total content of the nitrogen oxides before reaction is read as C1The total nitrogen oxide content after the reaction is read as C2And calculating the denitration efficiency and activity of the sample according to the following formula:
the denitration efficiency is calculated according to the following formula:
the activity was calculated as follows:
K＝-AV×ln(1-η)
wherein:
eta: the value of the denitration efficiency of the catalyst, expressed in percentage;
k: the activity of the catalyst is expressed in meters per hour (m/h);
AV: the surface velocity is given in meters per hour (m/h).
The method is adopted to detect the activity of three groups of flat plate type flue gas denitration catalyst samples, the detection conditions are shown in table 1, the activity repeatability test results are shown in table 2, the activity detection results of samples produced by different formulas are shown in table 3, and the activity detection results of samples in service at different running times are shown in table 4.
TABLE 1 examination conditions
TABLE 2 table of the results of the activity reproducibility tests
As can be seen from Table 2, the three-time repeatability tests are respectively carried out on the same sample, and the three-time activity detection results are respectively 44.5m/h, 44.2m/h and 44.5m/h, which shows that the detection results have better repeatability when the system and the method of the utility model are used for carrying out the tests.
Table 3 table of activity test results of samples produced according to different formulations
As can be seen from Table 3, when the production samples with different formulas (different vanadium content and molybdenum content) are tested, the variation trend of the activity detection result of each sample is consistent with the actual condition, and the activity difference can be accurately distinguished, which shows that the detection result has better accuracy when the system and the method of the utility model are used for carrying out the test.
Table 4 table of results of activity test of in-service samples in different operation times
As can be seen from Table 4, the activity test is carried out on the in-service samples at different operation times, and the change trend of the activity test result is consistent with the actual activity test result; therefore, the utility model discloses a system and method can effectively trail the activity trend of change of catalyst in active service to can install additional, change the outfit or regeneration management provides technical support for the deNOx systems catalyst of power plant.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. A flat plate type denitration catalyst activity detection system is characterized by comprising:
the gas supply unit comprises more than two gas storage devices;
the gas distribution unit comprises a control valve which is arranged at the outlet end of each gas storage device and used for regulating the flow of each gas;
the reaction unit comprises a reaction device and a heating device for heating the reaction device, and the reaction device is connected with the gas distribution unit and is provided with a reaction cavity for accommodating the flat-plate denitration catalyst;
the analysis unit comprises a sampling device and a detection device for detecting gas composition, wherein the sampling device is provided with a first sampling port and a second sampling port which are respectively communicated with the front end and the rear end of the flat-plate denitration catalyst in the reaction cavity, and the detection device is communicated with the outlet end of the sampling device;
and the control unit is electrically connected with the gas distribution unit and the analysis unit respectively, and can control the gas distribution unit according to the information fed back by the analysis unit so as to adjust the flow of each gas.
2. The flat plate type denitration catalyst activity detecting system according to claim 1, wherein the gas supply unit comprises a first gas storage device for storing nitrogen gas, a second gas storage device for storing oxygen gas, a third gas storage device for storing nitrogen oxide gas and a fourth gas storage device for storing ammonia gas.
3. The flat plate type denitration catalyst activity detecting system according to claim 1, wherein the gas distribution unit further comprises a pressure regulating valve provided at an outlet end of each gas storage device for regulating gas pressure, a flow meter provided at an outlet end of each gas storage device for detecting gas flow, and a total flow meter provided at a total outlet end of the gas storage devices for detecting total flow of each gas, the pressure regulating valve, the flow meter and the total flow meter being electrically connected to the control unit, respectively.
4. The flat plate type denitration catalyst activity detecting system according to claim 1, further comprising a pretreatment unit disposed between the gas supply unit and the reaction unit, wherein the pretreatment unit comprises a mixing device for mixing gas and a preheating device for preheating gas, and the heating device and the preheating device are respectively electrically connected with the control unit.
5. The flat plate type denitration catalyst activity detecting system according to claim 4, wherein the mixing device is an annular coil pipe, and the pre-heating device is a radiation heating shell arranged outside the mixing device.
6. The flat plate type denitration catalyst activity detecting system according to claim 1, wherein the reaction device is a horizontal reactor, at least one concave groove for fixing the flat plate type denitration catalyst is arranged in a reaction chamber of the reaction device, a sample loading port is arranged on a side wall of the reaction device, a flange cover is arranged on the sample loading port, and a sealing gasket is arranged between the flange cover and the sample loading port.
7. The flat plate type denitration catalyst activity detecting system according to claim 1, wherein a first temperature sensor for detecting the gas temperature at the front end of the flat plate type denitration catalyst, a second temperature sensor for detecting the gas temperature at the rear end of the flat plate type denitration catalyst, a pressure sensor for detecting the gas pressure and a manual valve for controlling the gas pressure are provided on the reaction device, and the first temperature sensor, the second temperature sensor and the pressure sensor are respectively electrically connected with the control unit.
8. The flat plate denitration catalyst activity detecting system according to claim 1, wherein the analysis unit further comprises a filter disposed between the sampling device and the detecting device.
9. The flat plate type denitration catalyst activity detection system according to claim 1, wherein the sampling device is a three-way solenoid valve, and the detection device comprises a Fourier transform infrared analyzer and an oxygen detection device for detecting oxygen content.
10. The flat plate type denitration catalyst activity detection system according to claim 1, further comprising a tail gas treatment unit arranged at the outlet end of the reaction unit, wherein the tail gas treatment unit comprises an acidic adsorption tank for adsorbing ammonia gas and an alkaline adsorption tank for adsorbing nitrogen oxides.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113252412A (en) * | 2021-04-13 | 2021-08-13 | 苏州西热节能环保技术有限公司 | Surface sampling and analyzing method for honeycomb denitration catalyst |
| CN114712981A (en) * | 2022-05-10 | 2022-07-08 | 大唐南京环保科技有限责任公司 | Tail gas purification system and method for detecting performance of flue gas denitration catalyst |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113252412A (en) * | 2021-04-13 | 2021-08-13 | 苏州西热节能环保技术有限公司 | Surface sampling and analyzing method for honeycomb denitration catalyst |
| CN114712981A (en) * | 2022-05-10 | 2022-07-08 | 大唐南京环保科技有限责任公司 | Tail gas purification system and method for detecting performance of flue gas denitration catalyst |
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