Measurement system and detection method with uniform mixing and synchronous sampling of partitioned inspection

Abstract

The present invention discloses a measurement system and a detection method with uniform mixing and synchronous sampling of partition patrol, including a sampling probe, a sampling valve group, a pretreatment device, a uniform mixing device, a uniform mixing analysis device used in conjunction with the uniform mixing device, a partition patrol sampling device, a partition patrol analysis device used in conjunction with the partition patrol sampling device, and a control center. The sampling valve group includes a sampling valve, a sampling tee, a sampling solenoid valve, and a sampling pipeline connecting the sampling tee and the sampling solenoid valve. A plurality of sampling valve groups constitute a multi-channel sample gas transmission path; the sampling probe is arranged at the outlet of the denitrification flue, and one side of the sampling probe is connected to the sampling valve through a sampling pipeline. The sample gas of each partition can be mixed in equal quantity, in the same sequence, and fully and uniformly. The measurement has strong timeliness. The two sampling modes are measured synchronously without affecting each other.

Description

Technical Field

[0001] The present invention relates to the field of precise ammonia injection for SCR denitration, and in particular to a measurement system and a detection method with uniform mixing and synchronous sampling of zoned patrol. Background Art

[0002] At present, most SCR denitrification systems use single-point sampling. The problems with this sampling method are: first, after the implementation of ultra-low emission transformation, as the denitrification efficiency is further improved, the single-point sampling method cannot extract representative sample gas under conditions such as changes in boiler load, changes in coal types, and burner adjustments; second, it cannot monitor changes in uneven distribution of pollutant concentrations; third, the measurement data is inaccurate; fourth, it causes a series of phenomena such as excessive ammonia injection and air preheater blockage. At this stage, single-point sampling can no longer meet the requirements of flue gas measurement.

[0003] Therefore, it is urgently necessary to design a measurement system and detection method with uniform mixing and synchronous sampling of zoned patrol, which can not only extract representative sample gas after uniform mixing in real time to control the total amount of ammonia injection, but also synchronously patrol and sample the sample gas in each zone, so as to timely grasp the distribution characteristics of pollutant concentration at the SCR denitrification outlet, and combine the big data artificial intelligence control system to realize rapid adjustment and accurate response of ammonia injection amount with changes in operating conditions, carry out precise ammonia injection in different zones, and solve the problems of large fluctuations in CEMS data such as NOX and NH3 caused by ammonia injection in the SCR denitrification system, and blockage of the tail air preheater and dust collector. Summary of the invention

[0004] The purpose of the present invention is to provide a measurement system and detection method with uniform mixing and synchronous sampling of zoned patrol, in order to solve the current technical problems such as inaccurate gas sampling measurement data, poor representativeness of single-point sampling technology, excessive ammonia injection, air preheater blockage, inability to timely monitor the uneven distribution of pollutant concentrations, slow response speed of detection results and operating conditions, and difficulty in achieving accurate zoned ammonia injection.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] On one hand, the present invention provides a measurement system with uniform mixing and zoned patrol sampling, including a sampling probe, a sampling valve group, a pretreatment device, a uniform mixing device, a uniform mixing analysis device used in conjunction with the uniform mixing device, a zoned patrol sampling device, a zoned patrol analysis device used in conjunction with the zoned patrol sampling device, and a control center.

[0007] The sampling valve group includes a sampling valve, a sampling tee, a sampling solenoid valve, and a sampling pipeline connecting the sampling tee and the sampling solenoid valve, and a plurality of sampling valve groups constitute a multi-channel sample gas transmission path; the sampling probe is arranged at the outlet of the denitrification flue, and one side of the sampling probe is connected to the sampling valve through the sampling pipeline;

[0008] The pretreatment device includes a condensation device, a fine filter, a partition sampling pump, a sampling tee, a flow manual regulating valve and a float flowmeter according to the sampling flue gas flow direction, and each input port of the pretreatment is connected to the corresponding sampling solenoid valve outlet;

[0009] The uniform mixing device includes a mixing chamber and an exhaust gas collecting device according to the flow direction of the sampled flue gas, the output port of the pretreatment device is connected to the input port of the mixing chamber through a pipeline, the output port of the mixing chamber is connected to the uniform mixing analysis device through a pipeline, and the sewage outlet at the bottom of the mixing chamber is connected to the exhaust gas collecting device through a pipeline;

[0010] The zoned patrol sampling device comprises a zoned patrol sampling three-way electromagnetic valve, a sampling three-way and a waste gas collecting device according to the sampling flue gas flow direction, and sends multiple sample gases into the zoned patrol analysis device.

[0011] Furthermore, the sampling probe is a multi-beam probe type sampling probe.

[0012] Furthermore, the sample gas outlet temperature of the pretreatment device is lower than 5°C.

[0013] Furthermore, the uniform mixing and analyzing device includes a total sampling pump, a float flowmeter and a uniform mixing analyzer according to the flow direction of the sampled flue gas; the input port of the total sampling pump is connected with the output port of the mixing chamber through a pipeline.

[0014] Furthermore, the zoned patrol and analysis device includes a zoned patrol sampling pump, a float flowmeter and a zoned patrol analyzer according to the sampling flue gas flow direction.

[0015] Furthermore, the sampling pipeline includes a heated sampling pipeline and a non-heated sampling pipeline controlled according to the sample gas temperature, thereby forming a transmission path for the sample gas.

[0016] Furthermore, in the sampling pipeline forming the sample gas transmission path, the connecting pipeline between the sampling probe and the sampling solenoid valve adopts a double-core heated sampling pipeline with a heating temperature of 200°C, and the sampling pipeline behind the sampling solenoid valve adopts a non-heated sampling pipeline. All pipelines are made of PTFE and have an outer diameter of Φ8mm.

[0017] Furthermore, the number of pretreatment sets configured inside the pretreatment device is consistent with the number of flue partitions; the number of flue partitions is consistent with the number of sampling probes.

[0018] Furthermore, the number of the sampling probes is equal to the number of the sampling valves.

[0019] Another aspect of the present invention provides a detection method of the above-mentioned measurement system and detection method with uniform mixing and synchronous sampling of partitioned patrol, and the specific steps are as follows:

[0020] Step 1: Set up the measurement system;

[0021] s1, arrange sampling probes; the sampling probes are arranged in corresponding quantities according to the configuration characteristics of the ammonia nozzles at the denitrification inlet, the actual size of the denitrification outlet flue, and the partitioning of the denitrification outlet flue to form a matrix sampling;

[0022] s2, arrange the sampling valve group; the number of the sampling valve group is equal to the number of the sampling probes; the sampling probe, the sampling tee and the sampling solenoid valve are connected through the sampling pipeline to form a multi-channel sample gas transmission path; when back-blowing the sampling tube, close the sampling solenoid valve and open the back-blowing solenoid valve;

[0023] s3, laying out a sample gas pretreatment device, a uniform mixing device and a uniform mixing analysis device;

[0024] s4, deploying zoned patrol sampling devices and zoned patrol analysis devices;

[0025] s5, install the control center, accept and debug the measurement system, and put it into use after it passes the inspection;

[0026] Step 2: Start the uniform mixing mode in the control center;

[0027] s1, open the sampling valve group, and the sample gas enters the pretreatment device through the heated sampling pipeline connected to the multi-beam probe type sampling probe and the sampling valve;

[0028] s2, condense the sample gas to below 5°C through the pretreatment device, remove the moisture in the sample gas and separate the extremely fine solid particles contained in the sample gas, thus completing the sample gas pretreatment;

[0029] s3, the sample gas enters the uniform mixing device after pretreatment, and is pumped by the total sampling pump to the uniform mixing analyzer to complete the pollutant concentration analysis and measurement of the uniformly mixed sample gas in the entire flue;

[0030] Step 3: Start the zone patrol mode in the control center; switch the zone patrol sampling three-way solenoid valve from the exhaust gas collection side to the zone patrol sampling side in sequence according to the zone number; the flue gas is connected by a sampling pipeline, and is extracted from the patrol sampling three-way in the corresponding zone pretreatment device through the zone patrol sampling three-way solenoid valve and the zone patrol sampling pump to the zone patrol analyzer to complete the pollutant concentration analysis and measurement of the sample gas in each zone;

[0031] Step 4: reserve comparison test interfaces on the pipelines from the normally open exhaust port of the mixing chamber to the exhaust gas collection device and from the three-way solenoid valve for patrol sampling in each zone to the exhaust gas collection device to facilitate process debugging and third-party data comparison.

[0032] Further, in step 2, the working procedure of the uniform mixing mode is as follows:

[0033] First, the program starts and directly enters the uniform mixing mode, the uniform mixing mode working state label K is set to 1, and the back-purge times M=0;

[0034] Second, start the uniform mixing analyzer;

[0035] Third, close all sampling solenoid valves;

[0036] Fourth, open all back-purge solenoid valves, M=M+1;

[0037] Fifth, delay and wait for T1 time, when T1 time is up, execute sixth;

[0038] Sixth, close all back-purge solenoid valves;

[0039] Seventh, determine whether the purge times M is greater than 3, if "no", the program jumps to the fourth step, if "yes", the program executes the eighth step;

[0040] Eighth, open all partition sampling solenoid valves, and the purge times M=0;

[0041] Ninth, start all partition sampling pumps;

[0042] 10. Start the main sampling pump;

[0043] Eleventh, delay and wait for T2 time, when T2 time is up, jump to third;

[0044] Set manual button commands and remote control center stop uniform mixing mode working program commands;

[0045] The stop command trigger will stop the uniform mixing analyzer, stop all partition sampling pumps, stop the total sampling pump, close all sampling solenoid valves, close all back-purge solenoid valves, reset time parameter T1, reset time parameter T2, set the purge times M to 0, and set the uniform mixing mode working status label K to 0.

[0046] Further, in step 3, the specific steps of the partition inspection mode are as follows:

[0047] First, the manual button or remote control center sends a command to start the "partition patrol mode", and the partition patrol mode working status label Q is set to 1, and the partition number N=1;

[0048] Second, determine whether "uniform mixing mode working state label K = 1 and back-purge times M = 0" is satisfied. If "No", execute the third step; if "Yes", jump to the fifth step;

[0049] Third, determine whether "uniform mixing mode working state label K = 0 and back-purge times M = 0" is satisfied. If "no", jump to step 12; if "yes", execute step 4;

[0050] Fourth, close the back-purge solenoid valve of the serial number partition N, and open the sampling solenoid valve of the serial number partition N;

[0051] Fifth, open the three-way solenoid valve for patrol sampling of the serial number partition N, and switch the outlet from the exhaust gas collection side to the partition patrol sampling side;

[0052] Sixth, start the patrol sampling pump;

[0053] Seventh, delay and wait for T3 time, when T3 time is up, execute eighth;

[0054] Eighth, stop the patrol sampling pump;

[0055] Ninth, close the three-way solenoid valve of the N-th partition inspection and sampling, and switch the outlet from the partition inspection and sampling side to the exhaust gas collection side;

[0056] 10. Sequence number partition N=N+1;

[0057] Step 11: Determine whether the serial number partition N > the maximum number of partitions. If yes, proceed to step 12; if no, jump to step 13.

[0058] 12th, N=1, jump to 14th;

[0059] Step 13: Determine whether to stop the inspection. If yes, go to step 14; if no, go to step 2.

[0060] 14. The district inspection procedure is completed;

[0061] Set manual button commands and remote control center stop zone patrol mode working program commands; the stop command trigger will stop the patrol sampling pump, close all zone patrol sampling three-way solenoid valves, reset the T3 time parameter, set the partition number N to 1, and set the partition patrol mode working status label Q to 0.

[0062] The beneficial effects of the present invention are embodied in:

[0063] 1. The measuring system and detection method with uniform mixing and synchronous sampling of zone inspection provided by the present invention are reasonably designed and flexible in sampling configuration: the corresponding number of sampling probes can be flexibly arranged by zone according to the configuration of the ammonia nozzle of the denitrification inlet and the actual size characteristics of the flue of the denitrification outlet to form a matrix sampling; the sampling probe is provided with two-stage dust removal and filtration and timed back-purge function, and the system has strong anti-blocking performance; the multi-beam probe rods of the sampling probe are independent and movable joints, which are convenient for maintenance.

[0064] 2. The present invention provides a measurement system and detection method with uniform mixing and synchronous sampling of partitioned inspections. The "uniform mixing sampling" mode can achieve equal, simultaneous, and fully uniform mixing of sample gases in each partition.

[0065] 3. The present invention provides a measurement system and detection method with synchronous sampling of uniform mixing and partition patrol. The "partition patrol sampling" mode has strong measurement timeliness and can adjust the patrol time of each partition online according to the patrol demand. The shortest patrol time is less than min. The two modes of "uniform mixing sampling" and "partition patrol sampling" can be synchronized without interfering with each other's measurement, ensuring that the calculation of the SCR outlet NOx non-uniformity coefficient is more realistic; it only needs to adjust the sample gas flow relationship of the four devices, namely, the partition sampling pump in the pretreatment device, the normally open exhaust port of the mixing chamber in the uniform mixing device, the total sampling pump in the uniform mixing analysis device, and the partition patrol sampling pump in the partition patrol analysis device, to achieve the "uniform mixing sampling" and "partition patrol sampling" two sampling modes of synchronous measurement without affecting each other.

[0066] 4. The system synchronously monitors the oxygen content of the sample gas in each partition, and the data validity judgment is accurate and comprehensive;

[0067] 5. The system reserves a comparison test interface to facilitate process debugging and third-party data comparison.

[0068] 6. The detection system provided by the present invention can extract representative sample gas after uniform mixing, and realize real-time control of the total amount of ammonia injection by combining with the big data artificial intelligence control system. It can also simultaneously patrol and sample the sample gas of each partition, timely grasp the distribution characteristics of pollutant concentration at the outlet of SCR denitrification, accurately respond, and accurately spray ammonia in each partition, which greatly improves the accuracy of precise ammonia injection for denitrification and solves the NO caused by ammonia injection in the SCR denitrification system. X , NH3 and other CEMS data fluctuated greatly, and the rear air preheater and dust collector were blocked.

[0069] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by practicing the present invention. The main purpose and other advantages of the present invention can be realized and obtained by the schemes particularly pointed out in the description. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0071] Figure 1 It is a system diagram of the uniform mixing and zoned patrol synchronous sampling measurement system of the present invention.

[0072] Figure 2 yes Figure 1 Magnified image of the upper part.

[0073] Figure 3 yes Figure 1 Enlarged view of the middle part.

[0074] Figure 4 yes Figure 1The lower enlarged view of .

[0075] Figure 5 It is a flow chart of the working procedure of the uniform mixed sampling mode.

[0076] Figure 6 It is a flow chart of the working procedures of the zone patrol sampling mode.

[0077] Attached figure mark: 1-sampling probe, 21-sampling tee, 22-back-purge solenoid valve, 23-sampling solenoid valve, 31-condensing device, 32-fine filter, 33-zone sampling pump, 35-flow manual regulating valve, 36-float flowmeter,

[0078] 41-mixing chamber, 42-waste gas collection device,

[0079] 51- total sampling pump, 53- uniform mixing analyzer,

[0080] 61-partition patrol sampling three-way solenoid valve, 71-partition patrol sampling pump, 73-partition patrol analyzer, 81-heated sampling pipeline, 82-non-heated sampling pipeline. DETAILED DESCRIPTION

[0081] The technical solution of the present invention is described in detail below through examples. The following examples are merely exemplary and can only be used to explain and illustrate the technical solution of the present invention, but cannot be interpreted as limiting the technical solution of the present invention.

[0082] On the one hand, the present invention provides a measurement system and detection method with uniform mixing and synchronous sampling of partitioned patrol, including a sampling probe 1 (a multi-beam probe rod sampling probe can be used), a sampling valve group, a pretreatment device, a uniform mixing device, a uniform mixing analysis device used in conjunction with the uniform mixing device, a partitioned patrol sampling device, a partitioned patrol analysis device used in conjunction with the partitioned patrol sampling device, and a control center.

[0083] like Figure 1 , 2 As shown in , 3 and 4, the sampling valve group includes a sampling valve, a sampling tee 21, a sampling solenoid valve 23 and a sampling pipeline connecting the sampling tee 21 and the sampling solenoid valve 23. Several sampling valve groups constitute a multi-channel sample gas transmission path; the sampling probe 1 is arranged at the outlet of the denitrification flue, and one side of the sampling probe 1 is connected to the sampling valve through a sampling pipeline; wherein, the sampling pipeline includes a heated sampling pipeline 81 and a non-heated sampling pipeline 82 according to the sample gas temperature control, forming a sample gas transmission path. In the sampling pipeline forming the sample gas transmission path, the connecting pipeline between the sampling probe 1 and the sampling solenoid valve 23 adopts a double-core heated sampling pipeline 81, the heating temperature is 200°C, and the sampling pipeline behind the sampling solenoid valve 23 adopts a non-heated sampling pipeline 82. All pipelines are made of PTFE, and the outer diameter of the pipeline is Φ8mm.

[0084] The pretreatment device includes a condensation device 31, a fine filter 32, a partition sampling pump 33, a sampling tee 21, a patrol sampling port, a flow manual regulating valve 35 and a float flowmeter 36 according to the sampling flue gas flow direction. Each input port of the pretreatment is connected to the outlet of the corresponding sampling solenoid valve 23. The sample gas outlet temperature of the pretreatment device is lower than 5°C. Among them, the number of pretreatment sets configured inside the pretreatment device is consistent with the number of flue partitions; the number of flue partitions is consistent with the number of sampling probes 1. The number of sampling probes 1 is equal to the number of sampling valves.

[0085] The uniform mixing device includes a mixing chamber 41 and an exhaust gas collection device 42 according to the flow direction of the sampled flue gas. The output port of the pretreatment device is connected to the input port of the mixing chamber 41 through a pipeline, the output port of the mixing chamber 41 is connected to the uniform mixing analysis device through a pipeline, and the sewage outlet at the bottom of the mixing chamber 41 is connected to the exhaust gas collection device 42 through a pipeline to discharge excess sample gas and residual liquid. Among them, the uniform mixing analysis device includes a total sampling pump 51, a float flowmeter 36 and a uniform mixing analyzer 53 according to the flow direction of the sampled flue gas; the input port of the total sampling pump 51 is connected to the output port of the mixing chamber 41 through a pipeline.

[0086] The partitioned patrol sampling device includes a partitioned patrol sampling three-way solenoid valve 61, a sampling three-way 21 and an exhaust gas collection device 42 according to the sampling flue gas flow direction, and sends multiple sample gases to the partitioned patrol analysis device. Specifically, the partitioned patrol analysis device includes a partitioned patrol sampling pump 71, a float flowmeter 36 and a partitioned patrol analyzer 73 according to the sampling flue gas flow direction.

[0087] The above-mentioned sampling solenoid valve 23, back-blowing solenoid valve, zone sampling pump 33, total sampling pump 51, inspection sampling pump, zone inspection three-way solenoid valve, uniform mixing analyzer 53, and zone inspection analyzer 73 are all included in the remote control center system control.

[0088] The above-mentioned detection method of the measurement system and detection method with uniform mixing and synchronous sampling of partitioned patrol detection has the following specific steps:

[0089] Step 1: Set up the measurement system;

[0090] s1, arrange sampling probes 1; the multi-beam probe type sampling probes 1 are arranged in a corresponding number according to the configuration characteristics of the ammonia nozzles at the denitrification inlet, the actual size of the denitrification outlet flue, and the partitioning of the denitrification outlet flue, to form a matrix sampling;

[0091] s2, arrange the sampling valve group; the number of the sampling valve group is equal to the number of the sampling probe 1; the sampling probe 1, the sampling tee 21 and the sampling solenoid valve 23 are connected through the sampling pipeline to form a multi-channel sample gas transmission path; when the sampling tube is back-blown, the sampling solenoid valve 23 is closed and the back-blowing solenoid valve 22 is opened;

[0092] s3, laying out a sample gas pretreatment device, a uniform mixing device and a uniform mixing analysis device;

[0093] Among them, the pretreatment device includes a condensing device 31, a fine filter 32, a partitioned sampling pump 33, a sampling tee 21, a flow manual regulating valve 35 and a float flowmeter 36 according to the flow direction of the sampled flue gas, and the sample gas is condensed to below 5°C through the device; the uniform mixing device includes a mixing chamber 41 and an exhaust gas collection according to the flow direction of the sampled flue gas, and the multi-channel sample gas is uniformly mixed; the uniform mixing analysis device includes a total sampling pump 51, a float flowmeter 36 and a uniform mixing analyzer 53 according to the flow direction of the sampled flue gas, and completes the pollutant concentration analysis and measurement of the sample gas after uniform mixing;

[0094] s4, deploying zoned patrol sampling devices and zoned patrol analysis devices;

[0095] Among them, the partition patrol sampling device includes a partition patrol sampling three-way solenoid valve 61, a sampling three-way 21 and an exhaust gas collection device 42 according to the sampling flue gas flow direction, and the partition sampling of the pre-treated sample gas is realized through the device to realize the partition patrol function; the partition patrol analysis device includes a partition patrol sampling pump 71, a float flowmeter 36 and a partition patrol analyzer 73 according to the sampling flue gas flow direction, and completes the pollutant concentration analysis and measurement of the partition sample gas;

[0096] s5, install the control center, accept and debug the measurement system, and put it into use after it passes the inspection;

[0097] Step 2: Start the uniform mixing mode in the control center;

[0098] s1, open the sampling valve group, and the sample gas is connected to the multi-beam probe type sampling probe 1 and the sampling valve through the heated sampling pipeline 81 to enter the pretreatment device;

[0099] s2, condense the sample gas to below 5°C through the pretreatment device, remove the moisture in the sample gas and separate the extremely fine solid particles contained in the sample gas, thus completing the sample gas pretreatment;

[0100] s3, the sample gas enters the uniform mixing device after pretreatment, and is pumped by the total sampling pump 51 to the uniform mixing analyzer 53 to complete the pollutant concentration analysis and measurement of the uniformly mixed sample gas in the entire flue;

[0101] Step three, start the partition patrol mode in the control center; switch the partition patrol sampling three-way solenoid valve 61 from the exhaust gas collection side to the partition patrol sampling side according to the partition serial number, and the flue gas is connected by a sampling pipeline, and is extracted from the patrol sampling three-way 21 in the corresponding partition pretreatment device through the partition patrol sampling three-way solenoid valve 61 and the partition patrol sampling pump 71 to the partition patrol analyzer 73 to complete the pollutant concentration analysis and measurement of the sample gas in each partition.

[0102] Step 4: reserve comparison test interfaces on the pipelines from the normally open exhaust port of the mixing chamber 41 to the exhaust gas collection device 42 and from the three-way solenoid valves 61 for each zone inspection and sampling to the exhaust gas collection device 42 to facilitate process debugging and third-party data comparison.

[0103] like Figure 5 As shown, in step 2, the working procedure of the uniform mixing mode is as follows:

[0104] First, the program starts and directly enters the uniform mixing mode, the uniform mixing mode working state label K is set to 1, and the back-purge times M=0;

[0105] Second, start the uniform mixing analyzer 53;

[0106] Third, close all sampling solenoid valves 23;

[0107] Fourth, open all back-purge solenoid valves 22, M=M+1;

[0108] Fifth, delay and wait for T1 time, when T1 time is up, execute sixth;

[0109] Sixth, close all back-purge solenoid valves 22;

[0110] Seventh, determine whether the purge times M is greater than 3, if "no", the program jumps to the fourth step, if "yes", the program executes the eighth step;

[0111] Eighth, open all partition sampling solenoid valves 23, and the purge times M=0;

[0112] Ninth, start all partition sampling pumps 33;

[0113] Tenth, start the main sampling pump 51;

[0114] Eleventh, delay and wait for T2 time, when T2 time is up, jump to third;

[0115] Set manual button commands and remote control center stop uniform mixing mode working program commands;

[0116] The stop command trigger will stop the uniform mixing analyzer 53, stop all partition sampling pumps 33, stop the total sampling pump 51, close all sampling solenoid valves 23, close all back-purge solenoid valves 22, reset the time parameter T1, reset the time parameter T2, set the purge times M to 0, and set the uniform mixing mode working status label K to 0.

[0117] like Figure 6 As shown, in step 3, the specific steps of the partition inspection mode are as follows:

[0118] First, the manual button or remote control center sends a command to start the "partition patrol mode", and the partition patrol mode working status label Q is set to 1, and the partition number N=1;

[0119] Second, determine whether "uniform mixing mode working state label K = 1 and back-purge times M = 0" is satisfied. If "No", execute the third step; if "Yes", jump to the fifth step;

[0120] Third, determine whether "uniform mixing mode working state label K = 0 and back-purge times M = 0" is satisfied. If "no", jump to step 12; if "yes", execute step 4;

[0121] Fourth, close the back-purge solenoid valve 22 of the serial number partition N, and open the sampling solenoid valve 23 of the serial number partition N;

[0122] Fifth, open the three-way 21 solenoid valve of the serial number partition N patrol sampling, and switch the outlet from the exhaust gas collection side to the partition patrol sampling side;

[0123] Sixth, start the patrol sampling pump;

[0124] Seventh, delay and wait for T3 time, when T3 time is up, execute eighth;

[0125] Eighth, stop the patrol sampling pump;

[0126] Ninth, close the three-way electromagnetic valve 61 of the Nth partition inspection and sampling, and switch the outlet from the partition inspection and sampling side to the exhaust gas collection side;

[0127] 10. Sequence number partition N=N+1;

[0128] Step 11: Determine whether the serial number partition N > the maximum number of partitions. If yes, proceed to step 12; if no, jump to step 13.

[0129] 12th, N=1, jump to 14th;

[0130] Step 13: Determine whether to stop the inspection. If yes, go to step 14; if no, go to step 2.

[0131] 14. The district inspection procedure is completed;

[0132] Set manual button commands and remote control center stop zone patrol mode working program commands; the stop command trigger will stop the patrol sampling pump, close all zone patrol sampling three-way solenoid valves 61, reset T3 time parameter, set the partition number N to 1, and set the partition patrol mode working status label Q to 0.

[0133] The present invention can realize synchronous measurement of the two sampling modes of "uniform mixing sampling" and "zonal patrol sampling" without affecting each other by adjusting the sample gas flow relationship of the four devices, namely, the zone sampling pump 33 in the pretreatment device, the normally open exhaust port of the mixing chamber 41 in the uniform mixing device, the total sampling pump 51 in the uniform mixing analysis device, and the zone patrol sampling pump 71 in the zone patrol analysis device. The two sampling modes can be used for real-time extraction of representative sample gas after uniform mixing to control the total amount of ammonia injection, and the sample gas of each zone can be patrol sampled synchronously to timely grasp the distribution characteristics of pollutant concentration at the SCR denitrification outlet and perform precise zone ammonia injection.

[0134] 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 changes or substitutions that a technician familiar with the technical field can think of within the technical scope disclosed in the present invention should be covered within the protection scope of the present invention.

Claims

1. A detection method using a measurement system with uniform mixing and synchronous sampling of partitioned inspections, characterized in that: The measuring system comprises a sampling probe (1), a sampling valve group, a pretreatment device, a uniform mixing device, a uniform mixing analysis device used in conjunction with the uniform mixing device, a partition patrol sampling device, a partition patrol analysis device used in conjunction with the partition patrol sampling device, and a control center. The sampling valve group comprises a sampling tee (21), a sampling solenoid valve (23), a back-purge solenoid valve (22), and a sampling pipeline connecting the sampling tee (21) and the sampling solenoid valve (23), and a plurality of sampling solenoid valves (23) form a multi-channel sample gas transmission path; the sampling probe (1) is arranged at the outlet of the denitrification flue, and one side of the sampling probe (1) is connected to the sampling solenoid valve (23) through the sampling pipeline; the sampling pipeline includes a heated sampling pipeline (81) and a non-heated sampling pipeline (82) according to the sample gas temperature control; the connecting pipeline between the sampling probe (1) and the sampling solenoid valve (23) adopts a double-core heated sampling pipeline (81), the heating temperature of which is 200° C., and the sampling pipeline behind the sampling solenoid valve (23) adopts a non-heated sampling pipeline (82), and all pipelines are made of PTFE, and the outer diameter of the pipeline is Φ8 mm; The pretreatment device comprises a condensation device (31), a fine filter (32), a partitioned sampling pump (33), a sampling tee (21), a flow manual regulating valve (35) and a float flowmeter (36) according to the flow direction of the sampled flue gas. Each input port of the pretreatment is connected to the outlet of the corresponding sampling electromagnetic valve (23). The sample gas outlet temperature of the pretreatment device is lower than 5°C. The number of pretreatment sets configured inside the pretreatment device is consistent with the number of flue partitions; the number of flue partitions is consistent with the number of sampling probes (1); the number of sampling probes (1) is equal to the number of sampling valve groups; The uniform mixing and analyzing device comprises a total sampling pump (51), a float flowmeter (36) and a uniform mixing analyzer (53) according to the flow direction of the sampled flue gas; the input port of the total sampling pump (51) is connected to the output port of the mixing chamber (41) through a pipeline; The uniform mixing device comprises a mixing chamber (41) and an exhaust gas collecting device (42) according to the flow direction of the sampled flue gas, the output port of the pretreatment device is connected to the input port of the mixing chamber (41) through a pipeline, the output port of the mixing chamber (41) is connected to the uniform mixing analysis device through a pipeline, and the sewage outlet at the bottom of the mixing chamber (41) is connected to the exhaust gas collecting device (42) through a pipeline; The zoned patrol sampling device comprises a zoned patrol sampling three-way electromagnetic valve (61), a sampling three-way (21) and an exhaust gas collection device (42) according to the sampling flue gas flow direction, and sends multiple sample gases into the zoned patrol analysis device; the sampling probe (1) is a multi-beam probe type sampling probe; The partition patrol analysis device comprises a partition patrol sampling pump (71), a float flowmeter (36) and a partition patrol analyzer (73) according to the sampling flue gas flow direction; The specific steps are as follows: Step 1: Set up the measurement system; s1, arranging sampling probes (1); the multi-beam probe type sampling probes (1) are arranged in a corresponding number according to the configuration characteristics of the ammonia nozzles at the denitrification inlet, the actual size of the denitrification outlet flue, and the partitioning of the denitrification outlet flue, so as to form a matrix sampling; s2, arrange sampling valve groups; the number of sampling valve groups is equal to that of sampling probes (1); the sampling probes (1), the sampling tee (21) and the sampling electromagnetic valves (23) are connected through sampling pipelines to form a multi-channel sample gas transmission path; when back-blowing the sampling tube, the sampling electromagnetic valve (23) is closed and the back-blowing electromagnetic valve (22) is opened; s3, laying out a sample gas pretreatment device, a uniform mixing device and a uniform mixing analysis device; s4, deploying a zoned patrol sampling device and a zoned patrol analysis device; the zoned patrol sampling device includes a zoned patrol sampling three-way electromagnetic valve (61), a sampling three-way (21) and an exhaust gas collection device (42) according to the sampling flue gas flow direction, and the zoned sampling of the pre-treated sample gas is realized through the device, thereby realizing the zoned patrol function; the zoned patrol analysis device includes a zoned patrol sampling pump (71), a float flowmeter (36) and a zoned patrol analyzer (73) according to the sampling flue gas flow direction, and completes the pollutant concentration analysis and measurement of the zoned sample gas; s5, install the control center, accept and debug the measurement system, and put it into use after it passes the inspection; Step 2: Start the uniform mixing mode in the control center; s1, open the sampling valve group, and the sample gas enters the pretreatment device through the heated sampling pipeline (81) connected to the multi-beam probe type sampling probe (1) and the sampling valve group; s2, condense the sample gas to below 5°C through the pretreatment device, remove the moisture in the sample gas and separate the extremely fine solid particles contained in the sample gas, thus completing the sample gas pretreatment; s3, the sample gas enters the uniform mixing device after pretreatment, and is pumped by the total sampling pump (51) to the uniform mixing analyzer (53) to complete the pollutant concentration analysis and measurement of the uniformly mixed sample gas in the entire flue; Step 3: Start the zone patrol mode in the control center; switch the zone patrol sampling three-way solenoid valve (61) from the exhaust gas collection side to the zone patrol sampling side in sequence according to the zone sequence number; the flue gas is connected by a sampling pipeline, and is extracted from the sampling three-way (21) in the corresponding pretreatment device through the zone patrol sampling three-way solenoid valve (61) and the zone patrol sampling pump (71) to the zone patrol analyzer (73) to complete the pollutant concentration analysis and measurement of the sample gas in each zone; Step 4: reserve a comparison test interface on the pipeline from the normally open exhaust port of the mixing chamber (41) to the exhaust gas collection device (42), and from the three-way solenoid valve (61) for sampling in each zone to the exhaust gas collection device (42), so as to facilitate process debugging and third-party data comparison; In step 2, the working procedure of the uniform mixing mode is as follows: First, the program starts and directly enters the uniform mixing mode, the uniform mixing mode working state label K is set to 1, and the back-purge times M=0; Second, starting the uniform mixing analyzer (53); Third, close all sampling solenoid valves (23); Fourth, open all back-purge solenoid valves (22), M=M+1; Fifth, delay and wait for T1 time, when T1 time is up, execute sixth; Sixth, close all back-purge solenoid valves (22); Seventh, determine whether the purge times M is greater than 3, "No" then the program jumps to the fourth step, "Yes" then the program executes the eighth step; Eighth, open all partition sampling solenoid valves (23), and the purge times M=0; Ninth, start all partition sampling pumps (33); Tenth, start the main sampling pump (51); Eleventh, delay and wait for T2 time, when T2 time is up, jump to third; Set manual button commands and remote control center stop uniform mixing mode working program commands; The stop command trigger will stop the uniform mixing analyzer (53), stop all partition sampling pumps (33), stop the total sampling pump (51), close all sampling solenoid valves (23), close all back-purge solenoid valves (22), reset the time parameter T1, reset the time parameter T2, set the purge times M to 0, and set the uniform mixing mode working state label K to 0; In step 3, the specific steps of the partition inspection mode are as follows: First, the manual button or remote control center sends a command to start the "partition patrol mode", and the partition patrol mode working status label Q is set to 1, and the partition number N=1; Second, determine whether "uniform mixing mode working state label K = 1 and back-purge times M = 0" is satisfied. If "No", execute the third step; if "Yes", jump to the fifth step; Third, determine whether "uniform mixing mode working state label K = 0 and back-purge times M = 0" are satisfied. If "no", jump to step 12; if "yes", execute step 4; Fourth, close the N-zone back-purge solenoid valve (22), and open the N-zone sampling solenoid valve (23); Fifth, open the three-way electromagnetic valve (61) of the Nth partition inspection and sampling, and switch the outlet from the exhaust gas collection side to the partition inspection and sampling side; Sixth, start the patrol sampling pump; Seventh, delay and wait for T3 time, when T3 time is up, execute eighth; Eighth, stop the patrol sampling pump; Ninth, close the three-way electromagnetic valve (61) of the Nth partition inspection and sampling, and switch the outlet from the partition inspection and sampling side to the exhaust gas collection side; 10. Sequence number partition N=N+1; Step 11: Determine whether the serial number partition N > the maximum number of partitions. If yes, proceed to step 12; if no, jump to step 13. 12th, N=1, jump to 14th; Step 13: Determine whether to stop the inspection. If yes, proceed to step 14; if no, skip to step 2.

14. The district inspection procedure is completed; A manual button command and a remote control center stop zone patrol mode working program command are set; the stop command triggers the patrol sampling pump to stop, closes all zone patrol sampling three-way solenoid valves (61), resets the T3 time parameter, sets the zone sequence number N to 1, and sets the zone patrol mode working status label Q to 0.

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