Alarm device for online detection of linear deviation of ammonia injection valve in desulfurization and denitrification

Abstract

The utility model discloses a desulfurization and denitrification online detection ammonia injection valve linear deviation alarm device, and belongs to the technical field of pollutant desulfurization and denitrification. The device comprises a desulfurization and denitrification reactor, an ammonia sampling assembly, a detection alarm assembly and a switching assembly, the ammonia sampling assembly comprises a telescopic moving part and a sampling head, the moving part is movably connected with the desulfurization and denitrification reactor, the sampling head comprises a connecting part, an extending part and a plurality of sampling holes, and the connecting part is connected with the moving part and is perpendicular to the extending part; the plurality of sampling holes are arranged at equal intervals along the extension part so as to suck gas in different areas; the detection alarm assembly can detect the ammonia content in the gas and compare the ammonia content with the flow of the ammonia spraying valve, and gives an alarm when the deviation is too large; one end of the switching assembly is respectively communicated with different sampling holes through different gas conveying pipes, and the other end of the switching assembly is communicated with the detection alarm assembly. According to the utility model, more complete concentration data characteristics can be obtained, and the obtained measurement data are closer to real data.

Description

Technical Field

[0001] The utility model relates to the technical field of pollutant desulfurization and denitrification, in particular to an on-line detection ammonia injection valve linear deviation alarm device for desulfurization and denitrification. Background Art

[0002] Selective catalytic reduction (SCR) is the main technical means for removing nitrogen oxides (NOx) and sulfides (MSx) in flue gas. Using liquid ammonia as the reducing agent for the reaction, it undergoes an oxidation-reduction reaction with NOx and MSx in the flue gas under the action of a catalyst.

[0003] The ammonia injection valve is mainly used for the injection control of ammonia water or liquid ammonia, thereby controlling the process of the oxidation-reduction reaction. The linear deviation of the ammonia injection valve refers to the deviation between the actual flow rate and the theoretical flow rate of the valve at different opening degrees. This parameter is very important for ensuring the accuracy and stability of the desulfurization and denitrification system.

[0004] For the existing actual flow rate of ammonia water, multiple sampling probes are often required in the desulfurization and denitrification reactor to sample different positions and depths in the reactor, so as to obtain the actual ejection flow rate of the ammonia injection valve. The existing measurement devices are too complex, not easy to operate and have a high failure rate. Summary of the Utility Model

[0005] In view of this, it is necessary to provide an on-line detection ammonia injection valve linear deviation alarm device for desulfurization and denitrification to solve the problem of difficult measurement of the actual flow rate of ammonia water.

[0006] The utility model provides an on-line detection ammonia injection valve linear deviation alarm device for desulfurization and denitrification, including a desulfurization and denitrification reactor, and further including:

[0007] An ammonia sampling assembly, the ammonia sampling assembly includes a telescopic moving member and a sampling head. The moving member is movably connected to the desulfurization and denitrification reactor. The sampling head includes a connecting portion, an extending portion and a plurality of sampling holes. The connecting portion is connected to the moving member and is arranged perpendicular to the extending portion. The plurality of sampling holes are equidistantly arranged along the extending portion for sucking gases in different regions;

[0008] A detection and alarm assembly, the detection and alarm assembly can detect the ammonia content in the gas and compare it with the flow rate of the ammonia injection valve, and alarm when the deviation is too large;

[0009] A switching assembly, one end of the switching assembly is respectively communicated with different sampling holes through different gas pipes, and the other end of the switching assembly is communicated with the detection and alarm assembly.

[0010] Further, the sampling head includes at least two extending portions, the extending portions are equidistantly arranged around the connecting portion, and the sampling holes located on the same circumferential surface are communicated with each other.

[0011] Further, the sampling holes are arranged on the side of the extension part.

[0012] Further, there are four extension parts. One end of each extension part is connected to the connection part, and the other end of each extension part is relatively sealed.

[0013] Further, a groove is formed inside the moving part, and the air delivery pipe is embedded in the groove.

[0014] Further, the detection and alarm component includes an ammonia analyzer and an alarm. The ammonia analyzer is connected to the switching component. The switching component includes a multi-way solenoid valve, and the multi-way solenoid valve can sequentially connect different sampling holes and the ammonia analyzer; the alarm is electrically connected to the ammonia analyzer.

[0015] Further, it further includes an ammonia injection system, and the ammonia injection system includes an ammonia injection valve and a flow detector. The flow detector is arranged on the ammonia injection valve, and the flow detector can monitor the theoretical flow rate of the ammonia injection valve.

[0016] Further, it further includes an exhaust component. The exhaust component includes a measurement chamber and an exhaust part. The measurement chamber is respectively communicated with the exhaust part and the switching component, and the exhaust part can drive the gas in the switching component into the measurement chamber; the ammonia analyzer is communicated with the measurement chamber.

[0017] Further, it further includes a driving component. The driving component includes a driving cylinder body. The driving cylinder body is connected to the desulfurization and denitrification reactor, and the moving part is integrally arranged with the telescopic rod of the driving cylinder body.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0019] (1) An on-line detection and ammonia injection valve linear deviation alarm device for desulfurization and denitrification of the present utility model is provided with an ammonia sampling component. The ammonia sampling component includes a telescopic moving part and a sampling head. The moving part is movably connected to the desulfurization and denitrification reactor. The moving part can drive the sampling head to move along the X direction relative to the desulfurization and denitrification reactor, changing the position of the sampling head. The sampling head includes a connection part, an extension part and a plurality of sampling holes. The connection part is connected to the moving part and is perpendicular to the extension part. The extension part is arranged along the Y direction, and the plurality of sampling holes are equidistantly arranged along the extension part. The distances from each sampling hole to the connection part are different, so that samples can be taken at different positions in the Y direction of the desulfurization and denitrification reactor. The setting of the sampling head can comprehensively sample the three-dimensional space inside the desulfurization and denitrification reactor, obtain more complete concentration data characteristics, and the measured data is closer to the real data.

[0020] (2) An ammonia injection valve linear deviation alarm device for on-line detection of desulfurization and denitrification of the present utility model is provided with a detection and alarm component. The detection and alarm component can detect the ammonia content in the gas and compare it with the flow rate of the ammonia injection valve. By comparing and calculating the actual ammonia injection amount with the theoretical ammonia injection amount, the linear deviation can be obtained. An excessive linear deviation can trigger the alarm of the alarm, reminding relevant personnel to stop the machine for maintenance, avoiding excessive ammonia escape, or incomplete removal of sulfides and nitrides, thus causing environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present utility model and form a part of this application. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0022] Figure 1 is a schematic structural diagram of the whole of the present utility model;

[0023] Figure 2 is a schematic structural diagram of the ammonia sampling component in the present utility model;

[0024] Figure 3 is a schematic structural diagram of the sampling head in the present utility model;

[0025] Figure 4 is a schematic structural diagram of the gas transmission pipe in the present utility model.

[0026] In the figure, 100, desulfurization and denitrification reactor; 200, ammonia sampling component; 210, moving member; 211, groove; 220, sampling head; 221, connecting portion; 222, extending portion; 223, sampling hole; 230, gas transmission pipe; 300, detection and alarm component; 310, ammonia analyzer; 320, alarm; 400, switching component; 410, multi-way solenoid valve; 500, ammonia injection system; 510, ammonia injection valve; 520, flow detector; 600, exhaust component; 610, measurement chamber; 620, exhaust member; 700, driving component; 710, driving cylinder body; DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following will specifically describe the preferred embodiments of the present utility model in conjunction with the drawings, wherein the drawings form a part of this application and are used together with the embodiments of the present utility model to explain the principle of the present utility model, and are not used to limit the scope of the present utility model.

[0028] An ammonia injection valve linear deviation alarm device for on-line detection of desulfurization and denitrification in this embodiment relates to the technical field of pollutant desulfurization and denitrification. Through a single movable sampling head 220, comprehensive sampling is carried out on different areas in the desulfurization and denitrification reactor 100, so as to obtain the ammonia injection data of the ammonia injection valve 510. The structure is simple, the operation is convenient, and the measurement result is more accurate.

[0029] Please refer to Figures 1 to 4 Figures 1 to 4 , an ammonia injection valve linear deviation alarm device for on-line detection of desulfurization and denitrification in this embodiment, includes: a desulfurization and denitrification reactor 100, an ammonia sampling assembly 200, a detection and alarm assembly 300, and a switching assembly 400. In the desulfurization and denitrification reactor 100, ammonia water is sprayed into the flue gas of sulfide and nitrided compounds to achieve desulfurization and denitrification of the flue gas. The ammonia sampling assembly 200 can perform gas sampling at different positions in the desulfurization and denitrification reactor 100 to achieve comprehensive sampling of specific areas in the desulfurization and denitrification reactor 100. The detection and alarm assembly 300 can receive the sampled gas and detect the ammonia content in the gas, so as to estimate the actual ammonia injection amount of the ammonia injection valve 510. The linear deviation can be obtained by comparing and calculating the actual ammonia injection amount with the theoretical ammonia injection amount. An excessive linear deviation can trigger the alarm of the alarm 320 to remind relevant personnel to perform shutdown maintenance. The switching assembly 400 can isolate the gases from different sampling positions to obtain different ammonia concentration data.

[0030] The ammonia sampling assembly 200 includes a retractable moving member 210 and a sampling head 220. The moving member 210 is movably connected to the desulfurization and denitrification reactor 100. The moving member 210 can drive the sampling head to move along the X direction relative to the desulfurization and denitrification reactor 100 to change the position of the sampling head 220. The sampling head 220 includes a connecting portion 221, an extending portion 222, and a plurality of sampling holes 223. The connecting portion 221 is connected to the moving member 210 and is perpendicular to the extending portion 222. The extending portion 222 is arranged along the Y direction. The plurality of sampling holes 223 are equidistantly arranged along the extending portion 222. The distances from each sampling hole 223 to the connecting portion 221 are different, so as to sample different positions in the Y direction of the desulfurization and denitrification reactor 100. The setting of the sampling head 220 can perform comprehensive sampling of the three-dimensional space inside the desulfurization and denitrification reactor 100, obtain more complete concentration data characteristics, and make the measured data closer to the real data.

[0031] The detection and alarm assembly 300 can detect the ammonia content in the gas and compare it with the flow rate of the ammonia injection valve 510. The linear deviation can be obtained by comparing and calculating the actual ammonia injection amount with the theoretical ammonia injection amount. An excessive linear deviation can trigger the alarm of the alarm 320 to remind relevant personnel to perform shutdown maintenance to avoid excessive ammonia escape or incomplete removal of sulfide and nitrided compounds, causing environmental pollution.

[0032] One end of the switching assembly 400 is respectively communicated with different sampling holes 223 through different gas pipes 230, and the other end of the switching assembly 400 is communicated with the detection and alarm assembly 300 to isolate the gases from different sampling positions to obtain different ammonia concentration data.

[0033] In some embodiments, please refer to Figure 2 andFigure 3 , the sampling head 220 includes at least two extension parts 222, the extension parts 222 are arranged equidistantly around the connecting part 221, and the included angle between the two extension parts 222 is 180°, so that the sampling holes 223 can cover a wider area inside the reactor, ensuring the representativeness and uniformity of the sampled gas. The sampling holes 223 located on the same circumferential plane communicate with each other, which can more accurately reflect the ammonia concentration distribution at the position where the circumferential plane is located, reduce the error that may be caused by single-point sampling, and improve the detection accuracy. It can also ensure that the gases collected from multiple directions can converge together, so as to obtain a comprehensive sampling result.

[0034] As a further implementation manner, the sampling holes 223 are arranged on the side parts of the extension parts 222. The sampling holes 223 being located on the side parts can avoid the direct injection of the ammonia injection valve 510 into the sampling holes 223, interfering with the absorption of the ammonia concentration in the gas by the sampling holes 223, making the measurement data more accurate.

[0035] In the specific implementation process, there are four extension parts 222. One end of the extension part 222 is connected to the connecting part 221, and the other end of the extension part 222 is relatively sealed. The four extension parts 222 are perpendicular to each other and are distributed in different directions, which can cover a wider space range, ensure that the sampled gas is more representative, and reflect the actual distribution of the ammonia concentration inside the reactor. Three equidistantly arranged sampling holes 223 are provided on each extension part 222, and the sampling holes 223 are relatively evenly distributed, which can avoid offset sampling and further improve the uniformity of sampling.

[0036] It should be noted specifically that: Please refer to Figure 4 , the four sampling holes 223 located on the outermost sides of the four extension parts 222 are located on the same circumferential plane. One ends of four different gas pipes 230 are respectively communicated with the corresponding four sampling holes 223, and the other ends of the four different gas pipes 230 are combined into an integrated combined pipe. The three groups of different sampling holes 223 are combined into three combined pipes. Each combined pipe can suck the gas located on a circumferential plane for sampling and detection.

[0037] In some embodiments, please refer to Figure 2 , a groove 211 is opened inside the moving part 210, and the three combined pipes are embedded in the groove 211. The moving part 210 can effectively protect the gas pipes 230 from external physical damage, such as abrasion, extrusion and impact, and extend the service life of the gas pipes 230. The groove 211 structure can also prevent the gas pipes 230 from being directly exposed to a high-temperature and highly corrosive flue gas environment, reducing the damage caused by harsh environmental conditions.

[0038] In some embodiments, please refer to Figure 1, the detection and alarm component 300 includes an ammonia analyzer 310 and an alarm 320. The ammonia analyzer 310 is connected to the switching component 400. The switching component 400 includes a multi-way solenoid valve 410, and the multi-way solenoid valve 410 can sequentially connect different sampling holes 223 and the ammonia analyzer 310. The multi-way solenoid valve can sequentially connect different sampling holes 223 and the ammonia analyzer 310 to achieve multi-point sampling and detection, allowing gas samples to be collected at different positions and depths, ensuring the representativeness and comprehensiveness of sampling.

[0039] The multi-way solenoid valve 410 can sequentially connect different sampling holes 223 and the ammonia analyzer 310 to achieve multi-point sampling and detection. This design allows gas samples to be collected at different positions and depths, ensuring the representativeness and comprehensiveness of sampling. The data of multiple sampling points are analyzed by the same ammonia analyzer 310, ensuring the unity and consistency of the data and avoiding calibration errors that may occur between multiple devices.

[0040] Through the combination of a multi-way solenoid valve 410 and an ammonia analyzer 310, the detection requirements for multiple sampling points are met, reducing the number of required devices, thereby reducing the complexity and cost of the system.

[0041] The alarm 320 is electrically connected to the ammonia analyzer 310. When the ammonia analyzer 310 detects an abnormal concentration, it can immediately trigger the alarm 320 to quickly issue an alarm, reminding the operator to make adjustments in a timely manner. The real-time monitoring and quick-response alarm mechanism improves the safety of the system, prevents potential hazards caused by excessive or insufficient ammonia, and ensures the stable operation of the system.

[0042] An on-line detection and ammonia injection valve linear deviation alarm device for desulfurization and denitrification also includes an exhaust component 600. The exhaust component 600 includes a measurement chamber 610 and an exhaust member 620. The measurement chamber 610 is respectively connected to the exhaust member 620 and the switching component 400, and the exhaust member 620 can drive the gas in the switching component 400 into the measurement chamber 610; the ammonia analyzer 310 is connected to the measurement chamber 610.

[0043] The measurement chamber 610 provides a stable environment, enabling the incoming gas sample to be briefly balanced and mixed before measurement, which helps to improve the accuracy and stability of ammonia concentration measurement. Through the measurement chamber 610, the external interference that may occur during the process of the gas sample directly entering the ammonia analyzer 310 can be reduced, ensuring the reliability of the measurement results.

[0044] The exhaust member 620 can effectively drive the gas from the switching component 400 into the measurement chamber 610, ensuring the rapid and smooth transmission of the gas sample to the ammonia analyzer 310 and avoiding delays or sample losses caused by poor gas transmission.

[0045] In a specific implementation process, the exhaust component 620 may be a fan or an air pump to drive the gas to flow slowly.

[0046] In some embodiments, please refer to Figure 1 , a linear deviation alarm device for online detection of ammonia injection valves for desulfurization and denitration, also includes a driving assembly 700, the driving assembly 700 includes a driving cylinder 710, the driving cylinder 710 is connected to the desulfurization and denitration reactor 100, and the moving part 210 is integrated with the telescopic rod of the driving cylinder 710. The driving cylinder 710 controls the precise position of the moving part 210 through the telescopic rod, so that the sampling head 220 can accurately reach the designated position in the reactor, ensuring the accuracy and representativeness of the sampling. The driving cylinder 710 provides stable mechanical movement, reduces errors and unstable factors caused by human operation, and improves the reliability of the sampling process.

[0047] The driving cylinder 710 can automatically adjust the position of the moving part 210 according to a set program to achieve automatic sampling, reduce manual intervention, and improve the automation level and work efficiency of the system.

[0048] Workflow: First, start the ammonia spray valve 510 to spray ammonia water into the desulfurization and denitration reactor 100. Then, the exhaust part 620 is started, and the multi-way solenoid valve 410 is opened in sequence, and the gas is sucked from the three groups of combined pipes respectively, and the gas is transported to the measuring chamber 610 for the ammonia analyzer 310 to test. The moving part 210 can drive the sampling head 220 to move along the X direction, and perform secondary sampling on different ones, so as to realize a comprehensive detection of the desulfurization and denitration reactor 100 and obtain data closer to the truth. The detection alarm component 300 can detect the ammonia content in the gas and compare it with the flow rate of the ammonia spray valve 510. The actual ammonia spray amount is compared with the theoretical ammonia spray amount to obtain the linear deviation. Excessive linear deviation can trigger the alarm 320 to alarm, reminding relevant personnel to shut down for maintenance, avoid excessive ammonia escape, or incomplete removal of sulfide and digestate, and cause pollution to the environment.

[0049] The above description is only a preferred specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be covered by the present invention.

Claims

1. An online detection and ammonia injection valve linear deviation alarm device for desulfurization and denitrification, comprising a desulfurization and denitrification reactor, characterized in that, Further included are: An ammonia sampling assembly, which includes a telescopic moving member and a sampling head. The moving member is movably connected to the desulfurization and denitrification reactor. The sampling head includes a connecting portion, an extending portion, and a plurality of sampling holes. The connecting portion is connected to the moving member and is perpendicular to the extending portion. The plurality of sampling holes are equidistantly arranged along the extending portion for sucking gases from different regions; A detection and alarm assembly, which can detect the ammonia content in the gas and compare it with the flow rate of the ammonia injection valve, and alarm when the deviation is too large; A switching assembly, one end of which is respectively connected to different sampling holes through different gas pipes, and the other end of the switching assembly is connected to the detection and alarm assembly.

2. The on-line detection ammonia injection valve linear deviation alarm device for desulfurization and denitrification according to claim 1, characterized in that The sampling head includes at least two extending portions, and the extending portions are equidistantly arranged around the connecting portion, and the sampling holes located on the same circumferential surface are communicated with each other.

3. The on-line detection ammonia injection valve linear deviation alarm device for desulfurization and denitrification according to claim 2, characterized in that, The sampling holes are arranged on the side of the extending portion.

4. An on-line detection ammonia injection valve linear deviation alarm device for desulfurization and denitrification according to claim 2, characterized in that, There are four extending portions. One end of the extending portion is connected to the connecting portion, and the other end of the extending portion is relatively sealed.

5. An online detection ammonia injection valve linear deviation alarm device for desulfurization and denitrification according to claim 1, characterized in that, A groove is formed inside the moving member, and the gas pipe is embedded in the groove.

6. The on-line detection and ammonia injection valve linear deviation alarm device for desulfurization and denitrification according to claim 1, characterized in that, The detection and alarm assembly includes an ammonia analyzer and an alarm. The ammonia analyzer is connected to the switching assembly. The switching assembly includes a multi-way solenoid valve, and the multi-way solenoid valve can sequentially connect different sampling holes and the ammonia analyzer; the alarm is electrically connected to the ammonia analyzer.

7. An on-line detection and ammonia injection valve linear deviation alarm device for desulfurization and denitrification according to claim 1, characterized in that Further included is an ammonia injection system, which includes an ammonia injection valve and a flow detector. The flow detector is arranged on the ammonia injection valve, and the flow detector can monitor the theoretical flow rate of the ammonia injection valve.

8. An online detection ammonia injection valve linear deviation alarm device for desulfurization and denitrification according to claim 6, characterized in that Further included is an exhaust assembly, which includes a measurement chamber and an exhaust member. The measurement chamber is respectively connected to the exhaust member and the switching assembly, and the exhaust member can drive the gas in the switching assembly into the measurement chamber; The ammonia analyzer is connected to the measurement chamber.

9. The on-line detection ammonia injection valve linear deviation alarm device for desulfurization and denitrification according to claim 1, characterized in that, Further included is a driving assembly, which includes a driving cylinder body. The driving cylinder body is connected to the desulfurization and denitrification reactor, and the moving member is integrally arranged with the telescopic rod of the driving cylinder body.

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