Novel precise ammonia spraying control system of SNCR (selective non-catalytic reduction) denitration system

Abstract

The invention discloses a novel precise ammonia spraying control system for an SNCR (selective non-catalytic reduction) denitration system. The system comprises an original pipeline, a newly added pipeline, a partitioned solution mother pipe, a first connecting pipe, a main stop valve, a first stop valve and partitioned solution branch mother pipes, a partition solution mother pipe is connected to the newly added pipeline, a main stop valve, a first stop valve and a second stop valve are arranged in the partition solution mother pipe, and the main stop valve is connected with the first stop valve and the second stop valve in parallel; according to the device, a modular design is adopted, dual improvement of denitration accuracy and stability is achieved through monitoring system reconstruction and control logic optimization, on one hand, a closed-loop control system with partition real-time monitoring, trend pre-judgment and hierarchical quantity control is constructed, flue gas analyzers and sampling point probes are arranged at inlets of the three types of cyclone separators respectively, and on the other hand, the flue gas analyzers and the sampling point probes are arranged on the other sides of the three types of cyclone separators respectively; the NOx concentration of the original flue gas of each partition is collected in real time and synchronously passes through a data collection chip arranged in the partition NOx storage early warning device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of SNCR denitration system, and particularly relates to a novel SNCR denitration system precise ammonia injection control system. BACKGROUND

[0002] In the field of industrial boiler flue gas nitrogen oxide treatment, the selective non-catalytic reduction denitration technology has become one of the mainstream technical paths for small and medium-sized boiler denitration due to its low equipment investment cost and high system layout flexibility, but the existing SNCR denitration system faces core technical bottlenecks in the running process, which makes it difficult to balance the denitration efficiency and economy. First, the flue gas monitoring system has structural defects. The system is generally not equipped with a continuous monitoring system for the denitration inlet flue gas, and the original flue gas NOx concentration at the inlet of the cyclone separator cannot be obtained in real time. Only the outlet NOx concentration is monitored at a single point in the chimney inlet flue, which is affected by the long-distance transportation of flue gas from the separator to the chimney. The data lag is up to minutes, and the single-point data cannot reflect the NOx concentration gradient formed by the differences in combustion conditions and flue gas flow in different cyclone separator partitions. This directly leads to distorted judgment of ammonia injection demand, and further leads to the contradiction between insufficient ammonia injection in high-NOx concentration partitions resulting in emission exceeding the standard and excessive ammonia injection in low-NOx concentration partitions resulting in ammonia escape. At the same time, only six of the eighteen supporting spray guns are used, and the inlet spray guns are idle for a long time. The ammonia injection coverage is limited to the outlet of the separator, and the synergistic effect of inlet pre-reaction and outlet deep removal cannot be formed, further exacerbating the fluctuation of denitration efficiency and waste of urea. Second, the lack of pipeline system functions and insufficient operation and maintenance capacity restrict the system stability. The system cannot realize flexible switching of independent operation of the original system, independent operation of the new system, and parallel operation of the double systems. When a single system fails, it needs to be shut down for maintenance, which may cause environmental pollution exceeding the standard due to interruption of denitration. Moreover, the system has no NOx concentration data storage and trend warning function, and cannot trace the parameter matching relationship under historical working conditions, which makes it difficult to optimize the operation strategy and further amplifies the emission risk and operation cost. SUMMARY

[0003] The present application aims to provide a novel SNCR denitration system precise ammonia injection control system to solve the problems raised in the background art.

[0004] In order to solve the above technical problems, the present application provides the following technical scheme: a novel SNCR denitration system precise ammonia injection control system, comprising a new pipeline, a partitioned solution main pipe is connected to the new pipeline, a main stop valve, a first stop valve and a second stop valve are arranged in the partitioned solution main pipe, the main stop valve is connected in parallel with the first stop valve and the second stop valve, a bag filter is arranged between the first stop valve and the second stop valve, a first connecting pipe and a second connecting pipe are connected to the new pipeline, and the first connecting pipe and the second connecting pipe are arranged in the partitioned solution main pipe, and the ends of the first connecting pipe and the second connecting pipe are connected with an original pipeline, and a third stop valve is arranged on the first connecting pipe and the second connecting pipe.

[0005] As a further technical scheme of the present application, one side of the partitioned solution main pipe is connected with a partitioned solution branch main pipe, and an A zone main pipe control group, a B zone main pipe control group and a C zone main pipe control group are arranged in the partitioned solution branch main pipe, and the A zone main pipe control group, the B zone main pipe control group and the C zone main pipe control group are connected in parallel.

[0006] As a further technical scheme of the present application, one side of the partitioned solution main pipe is connected with a partitioned solution branch pipe, an A zone branch pipe fine adjustment group, a B zone branch pipe fine adjustment group and a C zone branch pipe fine adjustment group are arranged in the partitioned solution branch pipe, and the A zone branch pipe fine adjustment group, the B zone branch pipe fine adjustment group and the C zone branch pipe fine adjustment group are connected with the A zone main pipe control group, the B zone main pipe control group and the C zone main pipe control group respectively.

[0007] As a further technical scheme of the present application, the A zone branch pipe fine adjustment group, the B zone branch pipe fine adjustment group and the C zone branch pipe fine adjustment group are respectively connected with an A zone triple spray gun group, a B zone triple spray gun group and a C zone triple spray gun group, and an A separator, a B separator and a C separator are arranged on one side of the partitioned solution branch pipe.

[0008] As a further technical scheme of the present application, the output ends of the A separator, the B separator and the C separator are respectively connected with the A zone triple spray gun group, the B zone triple spray gun group and the C zone triple spray gun group.

[0009] As a further technical scheme of the present application, the A separator, the B separator and the C separator are respectively connected with an A flue gas analyzer, a B flue gas analyzer and a C flue gas analyzer, and a sampling point probe is arranged between the A flue gas analyzer, the B flue gas analyzer and the C flue gas analyzer and the A separator, the B separator and the C separator.

[0010] As a further technical scheme of the present application, the A flue gas analyzer, the B flue gas analyzer and the C flue gas analyzer are connected in parallel with a third connecting pipe, and a CEMS control interval end monitoring system is arranged at the end of the third connecting pipe.

[0011] As a further technical scheme of the present application, one side of the head A flue gas analyzer, the head B flue gas analyzer and the head C flue gas analyzer is connected with the A area NOx storage early warning device, the B area NOx storage early warning device and the C area NOx storage early warning device.

[0012] As a further technical scheme of the present application, the A area NOx storage early warning device, the B area NOx storage early warning device and the C area NOx storage early warning device are provided with data acquisition chips, data storage chips, result comparison chips, trend calculation chips and pre-adjustment instructions and early warning signal devices, and the output ends of the A area NOx storage early warning device, the B area NOx storage early warning device and the C area NOx storage early warning device are connected with the A area mother pipe control group, the B area mother pipe control group and the C area mother pipe control group.

[0013] As a further technical scheme of the present application, the output ends of the A area NOx storage early warning device, the B area NOx storage early warning device and the C area NOx storage early warning device are connected in parallel with the partitioned solution mother pipe.

[0014] Compared with the prior art, the present application has the following beneficial effects: the present application adopts modular design, and through monitoring system reconstruction and control logic optimization, realizes the dual improvement of denitration precision and stability, on the one hand, a closed-loop control system of partitioned real-time monitoring, trend prediction and graded control is constructed, flue gas analyzers and sampling point probes are configured at the entrances of the three types of cyclone separators, the NOx concentration of the original flue gas in each partition is collected in real time, the historical data storage and concentration change slope calculation are realized through the data acquisition chip, the data storage chip and the trend calculation chip built in the partitioned NOx storage early warning device, the NOx concentration change trend is predicted in advance and the pre-adjustment instruction is sent, and the three-level control logic of the partitioned solution mother pipe coarse adjustment, the partitioned solution branch mother pipe fine adjustment and the partitioned solution branch pipe fine adjustment is formed, the traditional one-size-fits-all control mode is completely abandoned, the denitration efficiency and economy are optimized, the system operation reliability and management convenience are significantly improved through the pipeline function upgrade and operation and maintenance system improvement, the compatible connection structure of the original pipeline and the new pipeline is constructed relying on the connecting pipe and the third stop valve, the flexible switching of the three operation modes is supported, the standby system can be switched to in a short time when a single system fails, the denitration interruption is avoided, the data tracing function of the partitioned NOx storage early warning device is used to support the retrieval of historical parameters according to the working conditions, and data support is provided for the optimization of the ammonia injection strategy by the operation and maintenance personnel, the double environmental protection guarantees of partitioned real-time monitoring and final verification of the total discharge port are realized in combination with the CEMS control inter-end monitoring system, the long-term stable and standard emission of the system is ensured, and the original twelve inlet spray guns are activated in combination with the newly added nine outlet spray guns to realize the full-area ammonia injection coverage of the separator inlet and outlet. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0016] Figure 1 It is a system structure schematic diagram of the present application.

[0017] Figure 2 It is Figure 1 It is an enlarged structure schematic diagram of A area in the present application.

[0018] Figure 3 It is Figure 1 It is an enlarged structure schematic diagram of B area in the present application.

[0019] Figure 4 It is a system structure schematic diagram of the early warning structure of the present application.

[0020] In the figure: 1, original pipeline; 2, new added pipeline; 3, partitioned solution main pipe; 4, first connecting pipe; 5, second connecting pipe; 6, main stop valve; 7, first stop valve; 8, second stop valve; 9, bag filter; 10, third stop valve; 11, partitioned solution branch main pipe; 12, A area main pipe control group; 13, B area main pipe control group; 14, C area main pipe control group; 15, partitioned solution branch pipe; 16, A area branch pipe fine adjustment group; 17, B area branch pipe fine adjustment group; 18, C area branch pipe fine adjustment group; 19, A area triplex spray gun group; 20, B area triplex spray gun group; 21, C area triplex spray gun group; 22, A separator; 23, B separator; 24, C separator; 25, A flue gas analyzer; 26, B flue gas analyzer; 27, C flue gas analyzer; 28, third connecting pipe; 29, CEMS control room end monitoring system; 30, A area NOx storage early warning device; 31, B area NOx storage early warning device; 32, C area NOx storage early warning device; 33, data acquisition chip; 34, data storage chip; 35, result comparison chip; 36, trend calculation chip; 37, pre-adjustment instruction and early warning signal device; 38, sampling point probe. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, and not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the present application.

[0022] See attached Figure 1 - attached Figure 4The application provides a new SNCR denitration system precise ammonia injection control system, which comprises a new pipeline 2, a partition solution main pipe 3 connected to the new pipeline 2, a main stop valve 6, a first stop valve 7 and a second stop valve 8 arranged in the partition solution main pipe 3, the main stop valve 6 being connected in parallel with the first stop valve 7 and the second stop valve 8, a bag filter 9 arranged between the first stop valve 7 and the second stop valve 8, a first connecting pipe 4 and a second connecting pipe 5 connected to the new pipeline 2 and arranged in the partition solution main pipe 3, the tail ends of the first connecting pipe 4 and the second connecting pipe 5 being connected with an original pipeline 1, and a third stop valve 10 arranged on the first connecting pipe 4 and the second connecting pipe 5, one side of the partition solution main pipe 3 being connected with a partition solution branch main pipe 11, the partition solution branch main pipe 11 being provided with an A-zone main pipe control group 12, a B-zone main pipe control group 13 and a C-zone main pipe control group 14, the A-zone main pipe control group 12, the B-zone main pipe control group 13 and the C-zone main pipe control group 14 being connected in parallel, the three control groups corresponding to three ammonia injection partition zones of an A separator 22, a B separator 23 and a C separator 24 respectively, each control group comprising a manual switch valve, a pipeline type electromagnetic flowmeter and a pneumatic regulating door, the total urea solution supply amount of each partition zone from the partition solution branch main pipe 11 can be independently adjusted according to the NOx concentration demand of the corresponding partition zone, so as to provide a stable partition total flow basis for subsequent branch pipe fine adjustment, one side of the partition solution main pipe 3 being connected with a partition solution branch pipe 15, the partition solution branch pipe 15 being provided with an A-zone branch pipe fine adjustment group 16, a B-zone branch pipe fine adjustment group 17 and a C-zone branch pipe fine adjustment group 18, the A-zone branch pipe fine adjustment group 16, the B-zone branch pipe fine adjustment group 17 and the C-zone branch pipe fine adjustment group 18 being connected with the A-zone main pipe control group 12, the B-zone main pipe control group 13 and the C-zone main pipe control group 14 respectively, each branch pipe fine adjustment group being composed of an ammonia injection branch pipe manual valve and a spray gun metering module, after receiving the urea solution distributed by the corresponding main pipe control group, the branch pipe fine adjustment group can fine tune the liquid medicine flow of a single spray gun according to the installation position difference and the atomization effect deviation of different spray guns in the partition zone, so as to ensure that the ammonia injection amount of each spray gun in the partition zone is accurately matched with the local flue gas NOx concentration, the A-zone branch pipe fine adjustment group 16, the B-zone branch pipe fine adjustment group 17 and the C-zone branch pipe fine adjustment group 18 being respectively connected with an A-zone triplex spray gun group 19, a B-zone triplex spray gun group 20 and a C-zone triplex spray gun group 21, one side of the partition solution branch pipe 15 being provided with the A separator 22, the B separator 23 and the C separator 24, each triplex spray gun group comprising three spray guns matched with three atomization compressed air interfaces and being respectively installed on both sides of the outlet flue of the corresponding separator, the A-zone triplex spray gun group 19 serving the A separator 22 partition zone, the B-zone triplex spray gun group 20 serving the B separator 23 partition zone, and the C-zone triplex spray gun group 21 serving the C separator 24 partition zone, thereby forming an ammonia injection execution unit of each partition zone.The outputs of the A separator 22, the B separator 23 and the C separator 24 are respectively connected with the A zone triplex spray gun group 19, the B zone triplex spray gun group 20 and the C zone triplex spray gun group 21, so that the spray nozzles of the triplex spray gun groups are aligned with the flue gas flow path in the outlet flue of the separator, and when the urea solution is accurately metered by the branch fine adjustment group, the urea solution is atomized by the spray guns into tens of microns of particles and sprayed into the flue, fully mixed with the flue gas containing NOx output by the separator, to create contact conditions for subsequent denitration chemical reactions; the A flue gas analyzer 25, the B flue gas analyzer 26 and the C flue gas analyzer 27 are respectively connected to the A separator 22, the B separator 23 and the C separator 24, and sampling point probes 38 are arranged between the A flue gas analyzer 25, the B flue gas analyzer 26, the C flue gas analyzer 27 and the A separator 22, the B separator 23 and the C separator 24, the sampling ports of the sampling point probes 38 are inserted into the inlet flue of the separator, and the original flue gas without denitration treatment is collected in real time, conveyed to the corresponding flue gas analyzer through a pipeline, the analyzer continuously detects the NOx concentration in the flue gas, filters invalid data exceeding the range, and generates standardized real-time concentration data; the A flue gas analyzer 25, the B flue gas analyzer 26 and the C flue gas analyzer 27 are connected in parallel with a third connecting pipe 28, and the end of the third connecting pipe 28 is provided with a CEMS control room end monitoring system 29, the third connecting pipe 28 collects and transmits the real-time NOx concentration data of the three flue gas analyzers to the CEMS control room end monitoring system 29, which monitors whether the total discharge NOx concentration of the whole system after denitration meets the standard, and compares the total discharge data with the real-time data of each zone to check whether there is an abnormal total discharge caused by the deviation of the zone ammonia injection, forming an end environmental protection standard verification mechanism; the A flue gas analyzer 25, the B flue gas analyzer 26 and the C flue gas analyzer 27 are respectively connected with the A zone NOx storage pre-warning device 30, the B zone NOx storage pre-warning device 31 and the C zone NOx storage pre-warning device 32, the three flue gas analyzers respectively transmit the standardized NOx concentration data of the corresponding zone to the storage pre-warning device on the same side, the storage pre-warning device receives the working condition signals such as boiler load and fuel type at the same time, stores the NOx concentration data in association with the working condition parameters, and provides complete data dimensions for subsequent historical comparison and trend prediction; the A zone NOx storage pre-warning device 30, the B zone NOx storage pre-warning device 31 and the C zone NOx storage pre-warning device 32 are respectively provided with a data acquisition chip 33, a data storage chip 34, a result comparison chip 35, a trend calculation chip 36 and a pre-adjustment instruction and pre-warning signal device 37, and the outputs of the A zone NOx storage pre-warning device 30, the B zone NOx storage pre-warning device 31 and the C zone NOx storage pre-warning device 32 are respectively connected with the A zone mother pipe control group 12, the B zone mother pipe control group 13 and the C zone mother pipe control group 14, and the pre-adjustment instruction of the liquid flow is sent to the corresponding mother pipe control group; the outputs of the A zone NOx storage pre-warning device 30, the B zone NOx storage pre-warning device 31 and the C zone NOx storage pre-warning device 32 are connected in parallel with the zone solution mother pipe 3, and the pre-warning signal is fed back to the mother pipe to assist in adjusting the total liquid supply.

[0023] Working principle: using the present application, first, the system is started, urea solution can enter the system through the original pipeline 1 or the new pipeline 2, through the first connecting pipe 4 and the second connecting pipe 5, both are arranged in the partition solution main pipe 3 and are equipped with the third stop valve 10, realize the flexible switching and compatible liquid supply of the original pipeline 1 and the new pipeline 2, when using the new pipeline 2 to supply liquid, the main stop valve 6, the first stop valve 7 and the second stop valve 8 in the partition solution main pipe 3 cooperatively control the total liquid flow, wherein the bag filter 9 connected in series between the first stop valve 7 and the second stop valve 8 can filter impurities in the urea solution, avoid solid particles to block the subsequent valve, flow meter and spray gun, and ensure the stability of liquid delivery, when the original pipeline 1 is needed to be used alone or the double pipeline is needed to be used in parallel, only need to adjust the third stop valve 10 to realize the pipeline switching, meet the liquid supply demand under different working conditions, after the urea solution is distributed through the partition solution main pipe 3, it is divided into two ways of transportation, one way enters the partition solution branch main pipe 11, the A zone main pipe control group 12, the B zone main pipe control group 13 and the C zone main pipe control group 14 connected in parallel in the main pipe are respectively corresponding to the A separator 22, the B separator 23 and the C separator 24, responsible for the preliminary control of the total ammonia injection amount of each partition, the other way enters the partition solution branch pipe 15, the A zone branch pipe fine adjustment group 16, the B zone branch pipe fine adjustment group 17 and the C zone branch pipe fine adjustment group 18 in the branch pipe are respectively connected with the A zone main pipe control group 12, the B zone main pipe control group 13 and the C zone main pipe control group 14 one by one, receive the liquid adjusted preliminarily by the main pipe control group, and further realize the single gun level flow fine adjustment, finally, the A zone branch pipe fine adjustment group 16, the B zone branch pipe fine adjustment group 17 and the C zone branch pipe fine adjustment group 18 respectively transport the urea solution accurately measured to the A zone triplex spray gun group 19, the B zone triplex spray gun group 20 and the C zone triplex spray gun group 21, the three spray gun groups are respectively connected to the output end of the A separator 22, the B separator 23 and the C separator 24, spray the atomized urea solution into the separator outlet flue, fully mix with the flue gas containing NOx and carry out the denitration reaction, in the denitration reaction process, the system realizes the dynamic adaptation of ammonia injection amount through partition monitoring and intelligent analysis, the A flue gas analyzer 25, the B flue gas analyzer 26 and the C flue gas analyzer 27 are connected to the corresponding A flue gas analyzer 25, B flue gas analyzer 26, C flue gas analyzer 27 through the sampling point probe 38 on the A separator 22, B separator 23, C separator 24, the sampling point probe 38 collects the original flue gas NOx concentration of each separator inlet in real time and transmits it to the corresponding flue gas analyzer, after the A flue gas analyzer 25, B flue gas analyzer 26, C flue gas analyzer 27 analyzes the NOx concentration data in real time, on the one hand, the partition monitoring data is summarized to the CEMS control room end monitoring system 29 through the third connecting pipe 28, realizes the final verification and standard monitoring of the total NOx concentration of the exhaust port, on the other hand, the real-time concentration data is transmitted to the A zone NOx storage alarm 30, B zone NOx storage alarm 31 and C zone NOx storage alarm 32 on the same side,The internal components of the A zone NOx storage pre-alarm 30, the B zone NOx storage pre-alarm 31 and the C zone NOx storage pre-alarm 32 cooperate to complete data processing and control instruction generation; the data acquisition chip 33 receives real-time NOx concentration data transmitted by the corresponding flue gas analyzer and performs format standardization; the data storage chip 34 stores real-time data and associated parameters such as boiler load and fuel type, thereby providing data support for historical working condition tracing; the result comparison chip 35 compares the current NOx concentration with the historical average under the same working condition in the data storage chip 34 to determine whether the current concentration is within the normal range; the trend calculation chip 36 calculates the change slope of the NOx concentration in the last one minute by the sliding window method and compares it with the preset threshold to predict the concentration change trend; if the trend calculation chip 36 determines that the concentration will exceed the standard, the pre-adjustment instruction and the early warning signal generator 37 immediately generates a partitioned ammonia injection amount adjustment instruction, which is transmitted to the corresponding A zone mother pipe control group 12, the B zone mother pipe control group 13 and the C zone mother pipe control group 14, respectively, to change the partitioned solution flow by adjusting the valve opening degree in the mother pipe control group; at the same time, the pre-adjustment instruction and the early warning signal generator 37 also feed back the early warning signal to the partitioned solution mother pipe 3 to assist the main stop valve 6 in fine-tuning the total solution supply amount, thereby forming a closed loop of monitoring, analysis, early warning and control amount; at the same time, the A zone branch pipe fine-tuning group 16, the B zone branch pipe fine-tuning group 17 and the C zone branch pipe fine-tuning group 18 further fine-tune the single gun solution flow according to the flow distribution of the corresponding mother pipe control group, thereby compensating for the local ammonia injection unevenness of the A triple spray gun group 19, the B triple spray gun group 20 and the C triple spray gun group 21 due to installation position and atomization effect differences, and ensuring that the NOx in the outlet flue of the A separator 22, the B separator 23 and the C separator 24 can be fully removed; finally, the flue gas after denitrification is collected into the total flue, and the CEMS control interval end monitoring system 29 monitors the NOx concentration of the total discharge port in real time to ensure that the emission index meets the standard, thereby completing the entire precise ammonia injection denitrification process.

[0024] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] The device embodiments described above are merely illustrative, wherein the units described as separate components can or can not be physically separate, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed to multiple network units. Part or all of the modules can be selected to achieve the purposes of the embodiments according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0026] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A novel precision ammonia injection control system for an SNCR denitrification system, comprising a newly added pipeline (2), characterized in that: The newly added pipeline (2) is connected to a partitioned solution main pipe (3). The partitioned solution main pipe (3) is equipped with a main shut-off valve (6), a first shut-off valve (7), and a second shut-off valve (8). The main shut-off valve (6) is connected in parallel with the first shut-off valve (7) and the second shut-off valve (8). A bag filter (9) is installed between the first shut-off valve (7) and the second shut-off valve (8). The newly added pipeline (2) is connected to a first connecting pipe (4) and a second connecting pipe (5). The first connecting pipe (4) and the second connecting pipe (5) are installed inside the partitioned solution main pipe (3). The ends of the first connecting pipe (4) and the second connecting pipe (5) are connected to the original pipeline (1). A third shut-off valve (10) is installed on both the first connecting pipe (4) and the second connecting pipe (5).

2. The novel SNCR denitrification system precision ammonia injection control system according to claim 1, characterized in that: One side of the partitioned solution main pipe (3) is connected to a partitioned solution branch main pipe (11), and the partitioned solution branch main pipe (11) is provided with an A-zone main pipe control group (12), a B-zone main pipe control group (13) and a C-zone main pipe control group (14), which are connected in parallel.

3. The novel SNCR denitrification system precision ammonia injection control system according to claim 2, characterized in that: One side of the partitioned solution main pipe (3) is connected to a partitioned solution branch pipe (15). The partitioned solution branch pipe (15) is equipped with an A-zone branch pipe fine adjustment group (16), a B-zone branch pipe fine adjustment group (17), and a C-zone branch pipe fine adjustment group (18). The A-zone branch pipe fine adjustment group (16), the B-zone branch pipe fine adjustment group (17), and the C-zone branch pipe fine adjustment group (18) are respectively connected to the A-zone main pipe control group (12), the B-zone main pipe control group (13), and the C-zone main pipe control group (14).

4. The novel SNCR denitrification system precision ammonia injection control system according to claim 3, characterized in that: The fine adjustment groups of the branch pipes in the A zone (16), the fine adjustment groups of the branch pipes in the B zone (17) and the fine adjustment groups of the branch pipes in the C zone (18) are respectively connected to the triple spray gun group in the A zone (19), the triple spray gun group in the B zone (20) and the triple spray gun group in the C zone (21). The A separator (22), the B separator (23) and the C separator (24) are provided on one side of the partition solution branch pipe (15).

5. The novel SNCR denitrification system precision ammonia injection control system according to claim 4, characterized in that: The output ends of the A separator (22), B separator (23) and C separator (24) are respectively connected to the A zone triple spray gun group (19), the B zone triple spray gun group (20) and the C zone triple spray gun group (21).

6. The novel SNCR denitrification system precision ammonia injection control system according to claim 5, characterized in that: A flue gas analyzer (25), B flue gas analyzer (26), and C flue gas analyzer (27) are respectively connected to the A separator (22), B separator (23), and C separator (24), and sampling point probes (38) are provided between the A flue gas analyzer (25), B flue gas analyzer (26), and C flue gas analyzer (27) and the A separator (22), B separator (23), and C separator (24).

7. The novel SNCR denitrification system precision ammonia injection control system according to claim 6, characterized in that: A third connecting pipe (28) is connected in parallel to the A flue gas analyzer (25), B flue gas analyzer (26) and C flue gas analyzer (27), and a CEMS control room end monitoring system (29) is installed at the end of the third connecting pipe (28).

8. The novel SNCR denitrification system precision ammonia injection control system according to claim 7, characterized in that: Each of the A flue gas analyzer (25), B flue gas analyzer (26) and C flue gas analyzer (27) is connected to an A-zone NOx storage early warning device (30), a B-zone NOx storage early warning device (31) and a C-zone NOx storage early warning device (32).

9. A novel SNCR denitrification system precision ammonia injection control system according to claim 8, characterized in that: The NOx storage early warning device (30) in zone A, NOx storage early warning device (31) in zone B, and NOx storage early warning device (32) in zone C are each equipped with a data acquisition chip (33), a data storage chip (34), a result comparison chip (35), a trend calculation chip (36), and a pre-adjustment instruction and early warning signal device (37). The output terminals of the NOx storage early warning device (30) in zone A, NOx storage early warning device (31) in zone B, and NOx storage early warning device (32) in zone C are respectively connected to the main control group (12) in zone A, the main control group (13) in zone B, and the main control group (14) in zone C.

10. A novel precision ammonia injection control system for an SNCR denitrification system according to claim 9, characterized in that: The output terminals of the NOx storage early warning device (30) in zone A, the NOx storage early warning device (31) in zone B, and the NOx storage early warning device (32) in zone C are connected in parallel to the partition solution header (3).

Images