Flue gas sampling switching box

Abstract

The utility model belongs to the technical field of flue gas sampling, and discloses a flue gas sampling switching box which comprises a box body, a mounting vertical plate is fixedly mounted in the box body, and a filter mounting position, a valve group mounting position and a control mounting position are sequentially arranged on the mounting vertical plate from bottom to top; a plurality of filters are mounted at the filter mounting position; a plurality of control valve banks and a main valve are mounted at the valve bank mounting position; a sampling controller is mounted at the control mounting position; the plurality of filters, the control valve group and the main valve form a plurality of sampling pipelines; the on-line sampling device can be mounted near the flue gas pipeline to be detected, is used for on-line sampling of flue gas circulating in the flue gas pipeline to be detected, is convenient to use, simple in overall structure and convenient to assemble and mount, and can reduce the use cost and improve the use effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of flue gas sampling, and in particular relates to a flue gas sampling switching box. Background Art

[0002] At present, a large amount of flue gas is generated during the operation of thermal power plants. The flue gas contains a large amount of pollutants, such as dust, nitrogen oxides, sulfur dioxide, etc., among which nitrogen oxides will cause certain pollution to the environment.

[0003] Therefore, it is necessary to measure the nitrogen oxide content in the flue gas in real time to control the emission of nitrogen oxides. There are various existing nitrogen oxide detection devices. The Chinese patent application number is: CN202320957820.4, which discloses a NOx flue gas collection and detection device, including a main body shell, a smoke inlet channel, a detection channel and a high-pressure gas channel are opened in the main body shell, a solenoid valve is installed on the main body shell, the smoke inlet channel and the detection channel are connected through the solenoid valve, a filter is detachably installed in the smoke inlet channel, and a NOx sensor is installed on the main body shell near the detection channel.

[0004] The above-mentioned existing flue gas collection and detection device of this type is installed on the flue gas duct to be detected, and can perform online sampling of the flue gas circulating in the flue gas duct, and then detect the NOx content in the extracted sample gas, thereby realizing online real-time detection and analysis. However, due to the large cross-section of the flue gas duct to be detected, it is necessary to install multiple flue gas collection and detection devices on the flue gas duct to be detected during use, and NOx detection sensors need to be provided on each of the flue gas collection and detection devices, resulting in a complex overall structure. In addition, since multiple flue gas collection and detection devices need to be installed on the flue gas duct, the overall structure is complex, the cost of use is high, and the use effect is reduced. Utility Model Content

[0005] The main technical problem to be solved by the utility model is to provide a flue gas sampling switching box, which can be installed near the flue gas duct to be tested, and is used for online sampling of the flue gas flowing in the flue gas duct to be tested. It is easy to use, has a simple overall structure, and is easy to assemble and install, which can reduce the cost of use and improve the use effect.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A flue gas sampling switching box includes a box body, on which a mounting plate is fixedly installed, and on which a filter mounting position, a valve group mounting position and a control mounting position are sequentially arranged from bottom to top; the filter mounting position is installed with multiple filters; the valve group mounting position is installed with multiple control valve groups and a main valve; the control mounting position is installed with a sampling controller, and the multiple filters, control valve groups and main valve constitute a multi-way sampling pipeline.

[0008] The following is a further optimization of the above technical solution by the present invention:

[0009] A plurality of transversely arranged mounting cross bars are sequentially installed at intervals from top to bottom on the mounting vertical plate at the filter mounting position. The plurality of filters are respectively fixedly installed on the corresponding mounting cross bars, and two adjacent filters are arranged at intervals.

[0010] Further optimization: each control valve group includes an air intake control valve and a back-blow control valve; the air intake control valve and the back-blow control valve are respectively fixedly mounted on the mounting plate, and two adjacent air intake control valves and back-blow control valves are arranged at intervals.

[0011] Further optimization: each sampling pipeline includes a sampling main pipe, the air inlet end of the sampling main pipe is connected to a smoke inlet joint, the smoke inlet joint is fixedly installed on the smoke pipe to be tested, and the air inlet end of the smoke inlet joint extends into the smoke pipe.

[0012] Further optimization: The above-mentioned filter, air intake control valve and main valve are connected in series in sequence along the flow direction of the flue gas on the air outlet side of the smoke inlet joint on the sampling main pipe.

[0013] Further optimization: the air inlet ends of the multiple backflush control valves are connected to the same backflush assembly, and the backflush assembly is installed in the box.

[0014] Further optimization: the air outlet of each backflush control valve is connected to a backflush pipeline, and the other end of the backflush pipeline is connected to the air outlet of the corresponding filter.

[0015] Further optimization: the air pressure of the back-flushing airflow in the back-flushing pipeline is 0.6-0.7 MPa.

[0016] Further optimization: the signal output end of the sampling controller is electrically connected to the control end of each main valve, intake control valve and backflush control valve respectively.

[0017] The utility model adopts the above technical solution, which is ingenious in conception and reasonable in structure. It can be set on one side of the flue gas duct to be detected, and then the various smoke inlet joints of the multi-channel sampling pipelines are respectively installed on the smoke pipe, and the air inlet end of the smoke inlet joint is extended into the smoke pipe to complete the assembly and installation; when one of the sampling pipelines needs to be sampled, the air inlet control valve and the main valve on the sampling pipeline are opened, and the air inlet control valves and the main valves of the other sampling pipelines are all in a closed state; at this time, the external negative pressure suction device works to form a negative pressure suction force in the sampling main pipe of this route, and to form a negative pressure suction force at the smoke inlet joint. At this time, the negative pressure suction force is used to absorb the smoke in the smoke pipe and transport it to the sampling main pipe to complete the sampling work.

[0018] The back-blowing assembly described in the present invention works so that high-pressure gas exists at the air inlet end of each back-blowing control valve; at this time, the back-blowing control valve is opened to allow the back-blowing airflow output by the back-blowing assembly to be transported to the air outlet end of the corresponding filter through the back-blowing pipeline, and the air inlet control valve on the sampling pipeline to be back-blown is closed. At this time, the back-blowing airflow is used to perform back-blowing operations on the corresponding filters, which is convenient for use; the back-blowing airflow is discharged into the flue gas duct through the smoke inlet joint.

[0019] The utility model adopts the above technical solution and can be installed near the smoke duct to be tested, and is used for online sampling of the smoke flowing in the smoke duct to be tested. It is easy to use, and the overall structure is simple and easy to assemble and install, which can reduce the cost of use and improve the use effect.

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of Example 1 of the present utility model;

[0022] Figure 2 This is a schematic diagram of the structure of a single-channel sampling pipeline in Example 1 of the present utility model;

[0023] Figure 3 This is a control block diagram in Example 1 of the present utility model;

[0024] Figure 4 This is a schematic diagram of the arrangement of the sampling connector in use in Example 1 of the present utility model;

[0025] Figure 5 This is a schematic diagram of the arrangement of the sampling connector when in use in Example 2 of the present utility model.

[0026] In the figure: 1-box; 2-mounting vertical plate; 3-mounting cross bar; 4-filter; 5-main valve; 6-sampling controller; 7-intake control valve; 8-backflush control valve; 801-backflush pipeline; 9-sampling main pipe; 10-smoke inlet connector. DETAILED DESCRIPTION

[0027] like Figure 1-4 As shown: A flue gas sampling switching box, including a box body 1, a mounting plate 2 is fixedly installed in the box body 1, and a filter mounting position, a valve group mounting position and a control mounting position are sequentially provided on the mounting plate 2 from bottom to top; a plurality of filters 4 are installed on the filter mounting position; a plurality of control valve groups and a main valve 5 are installed on the valve group mounting position; a sampling controller 6 is installed on the control mounting position, and the plurality of filters 4, the control valve group and the main valve 5 constitute a multi-way sampling pipeline.

[0028] In this embodiment, a plurality of transversely arranged mounting cross bars 3 are installed on the mounting vertical plate 2 at the filter installation position from top to bottom, and the plurality of filters 4 are fixedly installed on the corresponding mounting cross bars 3, and two adjacent filters 4 are arranged at intervals.

[0029] Each control valve group includes an intake control valve 7 and a blowback control valve 8; the intake control valve 7 and the blowback control valve 8 are fixedly mounted on the mounting plate 2, respectively, and two adjacent intake control valves 7 and blowback control valves 8 are arranged at intervals.

[0030] In this embodiment, the number of the filters 4 , the control valve groups and the main valves 5 match each other.

[0031] Each sampling pipeline includes a sampling main pipe 9, the air inlet end of the sampling main pipe 9 is connected to a smoke inlet connector 10, the smoke inlet connector 10 is fixedly installed on the smoke pipe to be tested, and the air inlet end of the smoke inlet connector 10 extends into the smoke pipe.

[0032] The filter 4 , the air intake control valve 7 and the main valve 5 are sequentially connected in series on the outlet side of the smoke inlet connector 10 on the sampling main pipe 9 along the flow direction of the smoke.

[0033] In this embodiment, the end of the sampling main pipe 9 of the multi-channel sampling pipeline away from the smoke inlet connector 10 is connected to the same external negative pressure suction device; the external negative pressure suction device generates negative pressure suction in the corresponding sampling main pipe 9 when it works.

[0034] In this embodiment, the filter 4 is used to filter the flue gas flowing through the corresponding sampling main pipe 9 to prevent dust in the flue gas from entering the sampling main pipe 9 .

[0035] The air intake control valve 7 is used to control the on / off of the sampling main pipe 9. When the air intake control valve 7 is opened, the sampling main pipe 9 is connected. When the air intake control valve 7 is closed, the sampling main pipe 9 is disconnected.

[0036] The main valve 5 is used to control the on-off of the gas outlet end of the sampling main pipe 9. When the main valve 5 is opened, the sampling main pipe 9 discharges the smoke after sampling.

[0037] With this design, when in use, a sampling pipeline is taken as an example for specific explanation, and the air intake control valves 7 and the main valves 5 of the other sampling pipelines are all in the closed state; the air intake control valve 7 and the main valve 5 on the sampling pipeline to be sampled are opened, and at this time the external negative pressure suction device works to form a negative pressure suction force in the sampling main pipe 9 of this line, and to form a negative pressure suction force at the smoke inlet joint 10. At this time, the negative pressure suction force is used to absorb the smoke in the smoke pipe and transport it to the sampling main pipe 9, and then transport it to the external online detection device through the external negative pressure suction device for online detection.

[0038] In this embodiment, the external negative pressure suction device may be a vacuum pump, and the external online detection device is an existing technology used to detect the collected smoke samples.

[0039] The air inlet ends of the multiple back-blowing control valves 8 are connected to the same back-blowing assembly, which is installed in the box 1; the air outlet end of each back-blowing control valve 8 is connected to a back-blowing pipeline 801, and the other end of the back-blowing pipeline 801 is connected to the air outlet end of the corresponding filter 4.

[0040] With this design, the back-blowing assembly works so that high-pressure gas exists at the air inlet end of each back-blowing control valve 8; at this time, the back-blowing control valve 8 is opened so that the back-blowing airflow output by the back-blowing assembly is transported to the air outlet end of the corresponding filter 4 through the back-blowing pipeline 801. At this time, the back-blowing airflow is used to perform back-blowing operations on the corresponding filter 4, which is convenient to use; the back-blowing airflow is discharged into the flue gas duct through the smoke inlet joint 10.

[0041] In this embodiment, the back-blowing component is a prior art and can adopt a back-blowing blower or the like.

[0042] In this embodiment, the pressure of the back-flushing airflow in the back-flushing pipeline 801 is 0.6-0.7 MPa.

[0043] The signal output end of the sampling controller 6 is electrically connected to the control end of each main valve 5 , the air intake control valve 7 and the blowback control valve 8 .

[0044] The sampling controller 6 outputs a control signal for independently controlling the corresponding main valve 5 , the air intake control valve 7 and the blowback control valve 8 to open or close.

[0045] like Figure 4As shown, in this embodiment 1, when the cross-section of the flue gas duct to be detected is circular, the smoke inlet connector 10 of each sampling line is fixedly installed on the flue gas duct, and the air inlet end of the smoke inlet connector 10 extends into the flue gas duct; multiple smoke inlet connectors 10 are arranged in a ring shape and at intervals along the outer surface of the flue gas duct.

[0046] In this embodiment 1, the overall length of each smoke inlet connector 10 can also be set to be different. Through multiple smoke inlet connectors 10 of different lengths, the smoke at different cross-sections in the smoke duct can be sampled, which is convenient to use and improves the use effect.

[0047] like Figure 5 As shown, in this embodiment 2, when the cross-section of the smoke duct to be detected is square, the smoke inlet connector 10 of each sampling pipeline is fixedly installed on the smoke duct, and the air inlet end of the smoke inlet connector 10 extends into the smoke duct; multiple smoke inlet connectors 10 are arranged along the outer surface of the smoke duct and arranged at intervals.

[0048] In this embodiment 2, the overall length of each smoke inlet connector 10 can also be set to be different. Through multiple smoke inlet connectors 10 of different lengths, the smoke at different cross-sections in the smoke duct can be sampled, which is convenient to use and improves the use effect.

[0049] When in use, the flue gas sampling switching box can be set on one side of the flue gas duct to be tested, and then each smoke inlet connector 10 of the multi-channel sampling pipeline can be installed on the flue gas duct respectively, and the air inlet end of the smoke inlet connector 10 can be extended into the flue gas duct to complete the assembly and installation.

[0050] Then, a sampling pipeline is taken as an example for specific explanation. The air intake control valve 7 and the main valve 5 of the other sampling pipelines are all in the closed state; the air intake control valve 7 and the main valve 5 on the sampling pipeline to be sampled are opened. At this time, the external negative pressure suction device works to form a negative pressure suction force in the sampling main pipe 9 of this line, and to form a negative pressure suction force at the smoke inlet joint 10. At this time, the negative pressure suction force is used to absorb the smoke in the smoke pipe and transport it to the sampling main pipe 9, and then transport it to the external online detection device through the external negative pressure suction device for online detection.

[0051] When backblowing is required, the backblowing component works so that high-pressure gas exists at the air inlet end of each backblowing control valve 8; at this time, the backblowing control valve 8 is opened to allow the backblowing airflow output by the backblowing component to be transported to the air outlet end of the corresponding filter 4 through the backblowing pipeline 801, and the air inlet control valve 7 on the sampling pipeline to be backblown is closed. At this time, the backblowing airflow is used to backblow the corresponding filter 4, which is convenient for use; the backblowing airflow is discharged into the flue gas duct through the smoke inlet connector 10.

[0052] For ordinary technicians in this field, based on the teachings of this utility model, without departing from the principles and spirit of this utility model, changes, modifications, substitutions and variations made to the implementation methods are still within the scope of protection of this utility model.

Claims

1. A flue gas sampling switching box, comprising a box body (1), characterized in that: A mounting plate (2) is fixedly installed in the box body (1), and a filter mounting location, a valve group mounting location, and a control mounting location are sequentially arranged on the mounting plate (2) from bottom to top; a plurality of filters (4) are installed on the filter mounting location; a plurality of control valve groups and a main valve (5) are installed on the valve group mounting location; a sampling controller (6) is installed on the control mounting location, and the plurality of filters (4), the control valve group, and the main valve (5) constitute a multi-channel sampling pipeline.

2. The flue gas sampling switching box according to claim 1, characterized in that: A plurality of transversely arranged mounting cross bars (3) are sequentially installed at intervals from top to bottom on the mounting vertical plate (2) at the filter installation location, and the plurality of filters (4) are respectively fixedly installed on corresponding mounting cross bars (3), and two adjacent filters (4) are arranged at intervals.

3. The flue gas sampling switching box according to claim 2, characterized in that: Each control valve group includes an air intake control valve (7) and a back-blowing control valve (8); the air intake control valve (7) and the back-blowing control valve (8) are respectively fixedly mounted on the mounting vertical plate (2), and two adjacent air intake control valves (7) and back-blowing control valves (8) are arranged at intervals.

4. The flue gas sampling switching box according to claim 3, characterized in that: Each sampling pipeline comprises a sampling main pipe (9), the air inlet end of the sampling main pipe (9) is connected to a smoke inlet connector (10), the smoke inlet connector (10) is fixedly mounted on the smoke pipe to be detected, and the air inlet end of the smoke inlet connector (10) extends into the smoke pipe.

5. The flue gas sampling switching box according to claim 4, characterized in that: The filter (4), the air intake control valve (7) and the main valve (5) are connected in series in sequence along the flow direction of the smoke on the outlet side of the smoke inlet joint (10) on the sampling main pipe (9).

6. The flue gas sampling switching box according to claim 5, characterized in that: The air inlet ends of the multiple backflush control valves (8) are connected to the same backflush assembly, and the backflush assembly is installed in the box (1).

7. The flue gas sampling switching box according to claim 6, characterized in that: The air outlet of each backflush control valve (8) is connected to a backflush pipeline (801), and the other end of the backflush pipeline (801) is connected to the air outlet of the corresponding filter (4).

8. The flue gas sampling switching box according to claim 7, characterized in that: The pressure of the back-flushing airflow in the back-flushing pipeline (801) is 0.6-0.7 MPa.

9. The flue gas sampling switching box according to claim 8, characterized in that: The signal output end of the sampling controller (6) is electrically connected to the control end of each main valve (5), the air intake control valve (7) and the backwash control valve (8).

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