Flue gas sampling detection equipment and denitration system of thermal power plant

Abstract

The utility model provides flue gas sampling detection equipment and a denitration system of a thermal power plant, and belongs to the field of air detection.The flue gas sampling detection equipment comprises a sampling probe, one end of the sampling probe stretches into a flue gas channel, the sampling probe comprises a filter cartridge, a filter element sleeve and a back flushing assembly, and the filter cartridge is a U-shaped cylinder with one end plugged; the filter element sleeve coaxially sleeves the periphery of the filter cartridge, a circulation gap is formed between the filter element sleeve and the filter cartridge, the filter element sleeve is provided with an opening end communicated with the smoke channel, the blocked end of the filter cartridge corresponds to the opening end, and the other end of the filter cartridge is communicated with the sampling pipeline; the back-blowing assembly comprises a flow guide bulge and a first back-blowing pipeline, the flow guide bulge is arranged in the circulation gap, the first back-blowing pipeline is communicated with the circulation gap, and an air blowing opening of the back-blowing runner corresponds to an air inlet of the filter element sleeve. Compared with the prior art, the flue gas sampling detection equipment provided by the utility model can solve the technical problems that the existing flue gas sampling probe is easy to block and inconvenient to clean.

Description

Technical Field

[0001] The utility model belongs to the field of transportation, and more specifically, relates to a flue gas sampling and detection device. Meanwhile, the utility model also relates to a denitration system of a thermal power plant. Background Art

[0002] A unit of the denitration system of a thermal power plant is generally equipped with multiple sets of denitration probes. The denitration probe has two solenoid valves, a sampling solenoid valve and a purge valve, at the analyzer. During normal operation, the sampling solenoid valve is energized for sampling, and the purge solenoid valve is de-energized and closed; during purge, the sampling solenoid valve is de-energized and closed, and the purge solenoid valve is opened to purge the inside of the probe filter element. At the same time, there is a purge solenoid valve at the probe, and there is a three-way purge inside the probe filter element at the inlet of the probe filter element. In recent years, the defect rate of the denitration system has been extremely high. The main cause of the defect is that the denitration probe often accumulates dust between the probe filter element and the filter element sleeve. After research by the research team, it was found that this set of equipment mainly has the following problems:

[0003] 1. Dust often accumulates between the filter element and the probe sleeve of the denitrification probe, resulting in the maximum amount of denitrification oxygen, which in turn causes inaccurate indication of the smoke detection device and poor denitrification effect. To this end, manual methods are generally used to periodically clean the gap between the probe filter element and the probe sleeve, but the cleaning effect is not good and the probe is prone to dust accumulation.

[0004] 2. The probe filter element has two-stage purge, both of which blow the inside of the probe filter element. The regular purge equipment was originally designed to save labor costs and reduce the defect rate. However, the purge pipeline does not blow between the probe filter element and the probe sleeve. Regular purge is not thorough and still requires manual purge, which has high maintenance costs. Utility Model Content

[0005] The utility model aims to provide a smoke sampling and detection device to solve the technical problems that the existing smoke sampling probe is easy to be blocked and inconvenient to clean.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a flue gas sampling and detection device, comprising a sampling probe with one end inserted into a flue gas channel, the sampling probe comprising a filter cartridge, a filter element sleeve and a backflush assembly, the filter cartridge is a U-shaped cartridge with one end blocked, the filter element sleeve is coaxially sleeved on the outer periphery of the filter cartridge, and a flow gap is provided between the filter element sleeve and the filter cartridge, the filter element sleeve has an open end connected to the flue gas channel, one end of the filter cartridge blocked corresponds to the open end, and the other end of the filter cartridge is connected to a sampling pipeline;

[0007] The back-blowing assembly includes a guide protrusion and a first back-blowing pipeline, the guide protrusion is arranged in the flow gap, the first back-blowing pipeline is connected to the flow gap, the filter cartridge, the filter element sleeve and the guide protrusion are enclosed to form a back-blowing flow channel, and the air port of the back-blowing flow channel is arranged corresponding to the air inlet of the filter element sleeve.

[0008] In a possible implementation, the guide protrusion is spirally wound around the inner wall of the filter element sleeve with the axis of the filter cartridge as the center, and is located in the flow gap.

[0009] In a possible implementation, the backflush assembly further includes a second backflush pipeline connected to the open end of the filter cartridge.

[0010] In a possible implementation, the sampling probe also includes a connecting sleeve mounted on the outer periphery of the filter cartridge sleeve, and corresponding to the connecting sleeve, a connecting hole is opened on the outer wall of the flue gas channel, and the connecting sleeve is used to form a sealed connection between the filter cartridge sleeve and the connecting hole.

[0011] In a possible implementation, the sampling probe also includes a connecting flange, one end face of which is sealingly abutted against the connecting sleeve and the filter element sleeve and is connected to the open end of the filter cartridge, and the other end face of the connecting flange is connected to the sampling pipeline and the second backflush pipeline.

[0012] In a possible implementation, the first back-blow pipeline is connected to a first back-blow solenoid valve, the second back-blow pipeline is connected to a second back-blow solenoid valve, and the sampling pipeline is connected to a sampling solenoid valve.

[0013] In one possible implementation, along the purge direction of the first back-blow pipeline, a first gas source and a first filter connected to the first back-blow pipeline are sequentially provided upstream of the first back-blow solenoid valve; along the purge direction of the second back-blow pipeline, a second gas source and a second filter connected to the second back-blow pipeline are sequentially provided upstream of the second back-blow solenoid valve.

[0014] In a possible implementation, the flue gas sampling and detection equipment further includes a gas analyzer and a distribution box. The gas analyzer is connected to the sampling solenoid valve through the sampling pipeline, and the distribution box is electrically connected to the gas analyzer.

[0015] The beneficial effect of the flue gas sampling and detection equipment provided by the utility model is that compared with the prior art, the flue gas sampling and detection equipment of the utility model can purge the gap between the filter element sleeve and the filter cartridge through a back-blowing component, thereby helping to improve the technical problem of the inconvenience in cleaning the gap between the filter cartridge and the filter element sleeve during the existing manual cleaning process, so as to prevent flue gas particles from clogging the sampling probe and solve the technical problem of high maintenance cost caused by the existing manual cleaning; in addition, the backflow protrusion arranged between the filter element sleeve and the filter cartridge in the utility model can not only speed up the flow rate of the purge airflow, but also guide the purge airflow, thereby improving the cleaning effect of the purge airflow on the flow gap.

[0016] Another object of the utility model is to provide a denitration system for a thermal power plant, wherein the denitration system for the thermal power plant has the flue gas sampling and detection device mentioned above.

[0017] Compared with the prior art, the denitrification equipment of the thermal power plant in the utility model has all the advantages of the above-mentioned flue gas sampling and detection equipment. Moreover, the modified denitrification sampling probe and purge assembly can operate safely and stably for a long time, greatly reducing the economic cost of maintaining the denitrification equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the prior art description. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0019] Figure 1 A schematic diagram of the overall structure of the smoke sampling and detection device provided by the embodiment of the utility model;

[0020] Figure 2 A schematic diagram of the structure of a sampling probe in a smoke sampling and detection device provided in an embodiment of the utility model.

[0021] In the figure:

[0022] 1. Filter cartridge;

[0023] 2. Filter sleeve;

[0024] 3. Backflush assembly; 31. guide protrusion; 32. first backflush pipeline; 321. first backflush solenoid valve; 33. second backflush pipeline; 331. second backflush solenoid valve;

[0025] 4. Connecting sleeve;

[0026] 5. Sampling pipeline; 51. Sampling solenoid valve;

[0027] 6. Connecting flange;

[0028] 7. Gas analyzer;

[0029] 8. Distribution box;

[0030] 9. Smoke duct. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] Please also read Figure 1 and Figure 2 , the smoke sampling and detection device provided by the utility model is now described. The smoke sampling and detection device includes a sampling probe with one end inserted into the smoke channel 9, the sampling probe includes a filter cartridge 1, a filter sleeve 2 and a back-blowing assembly 3, the filter cartridge 1 is a U-shaped cartridge with one end blocked, the filter sleeve 2 is coaxially sleeved on the outer periphery of the filter cartridge 1, and a flow gap is provided between the filter sleeve 2 and the filter cartridge 1, the filter sleeve 2 has an open end connected to the smoke channel 9, one end of the filter cartridge 1 blocked corresponds to the open end, and the other end of the filter cartridge 1 is connected to the sampling pipeline 5; the back-blowing assembly 3 includes a guide protrusion 31 and a first back-blowing pipeline 32, the guide protrusion 31 is provided in the flow gap, the first back-blowing pipeline 32 is connected to the flow gap, the filter cartridge 1, the filter sleeve 2 and the guide protrusion 31 are enclosed to form a back-blowing channel, and the air inlet of the back-blowing channel is provided corresponding to the air inlet of the filter sleeve 2.

[0033] Compared with the prior art, the flue gas sampling and detection equipment of this embodiment can purge the gap between the filter cartridge sleeve 2 and the filter cartridge 1 through the back-blowing component 3, which is conducive to improving the technical problem of the inconvenience in cleaning the gap between the filter cartridge 1 and the filter cartridge 2 during the existing manual cleaning process, so as to prevent the flue gas particles from clogging the sampling probe and solve the technical problem of high maintenance cost caused by the existing manual cleaning; in addition, the backflow protrusion arranged between the filter cartridge sleeve 2 and the filter cartridge 1 in this embodiment can not only speed up the flow rate of the purge airflow, but also guide the purge airflow, thereby improving the cleaning effect of the purge airflow on the circulation gap.

[0034] In some embodiments, the guide protrusion 31 is spirally arranged around the inner wall of the filter element sleeve 2 with the axis of the filter cartridge 1 as the center, and is located in the flow gap. In this embodiment, under the guiding effect of the spiral guide protrusion 31, the back-blowing airflow is sprayed toward the inside of the smoke channel 9 in a divergent shape at the outlet of the back-blowing flow channel, preventing dust from accumulating in the smoke channel 9.

[0035] In some embodiments, in order to clean the dust accumulated inside the filter cartridge 1, the backflush assembly 3 further includes a second backflush pipeline 33 connected to the open end of the filter cartridge 1. In specific implementation, through the cooperation between the first backflush pipeline 32 and the second backflush pipeline 33, the inside and outside of the filter cartridge 1 of the sampling probe can be cleaned more comprehensively to prevent the filter cartridge 1 from being blocked by soot.

[0036] In some embodiments, the sampling probe also includes a connecting sleeve 4 that is sleeved on the outer periphery of the filter sleeve 2. Corresponding to the connecting sleeve 4, a connecting hole is opened on the outer wall of the smoke channel 9. The connecting sleeve 4 is used to form a sealed connection between the filter sleeve 2 and the connecting hole. Such a setting can prevent smoke leakage in the smoke channel 9 and is conducive to the installation of the smoke sampling and detection equipment of the utility model on the smoke channel 9.

[0037] In order to facilitate the connection between the sampling pipeline 5 and the filter cartridge sleeve 2, in some embodiments, the sampling probe also includes a connecting flange 6, one end face of the connecting flange 6 is sealingly abutted against the connecting sleeve 4 and the filter cartridge sleeve 2, and is connected to the open end of the filter cartridge 1, and the other end face of the connecting flange 6 is connected to the sampling pipeline 5 and the second backflush pipeline 33.

[0038] In some embodiments, in order to facilitate the control of the on-off of the first back-blowing pipeline 32 and the second back-blowing pipeline 33, the first back-blowing pipeline 32 is connected with a first back-blowing solenoid valve 321, and the second back-blowing pipeline 33 is connected with a second back-blowing solenoid valve 331. Similarly, the sampling pipeline 5 is connected with a sampling solenoid valve 51 to control the on-off of the sampling pipeline 5. Further, in order to prevent the external gas source used from containing smoke particles, in specific implementation, along the purge direction of the first back-blowing pipeline 32, the first gas source and the first filter connected to the first back-blowing pipeline 32 are sequentially provided upstream of the first back-blowing solenoid valve 321; along the purge direction of the second back-blowing pipeline 33, the second gas source and the second filter connected to the second back-blowing pipeline 33 are sequentially provided upstream of the second back-blowing solenoid valve 331.

[0039] In some embodiments, in order to facilitate the on and off control of each solenoid valve, the flue gas sampling and detection equipment also includes a gas analyzer 7 and a distribution box 8. The gas analyzer 7 is connected to the sampling solenoid valve 51 through the sampling pipeline 5, and the distribution box 8 is electrically connected to the gas analyzer 7.

[0040] Based on the same inventive concept, this embodiment also proposes a denitration system for a thermal power plant. The denitration system for the thermal power plant has the flue gas sampling and detection equipment in the above embodiment.

[0041] Compared with the prior art, the denitrification equipment of the thermal power plant in this embodiment has all the benefits of the above-mentioned flue gas sampling and detection equipment. Moreover, the modified denitrification sampling probe and purge assembly can operate safely and stably for a long time, greatly reducing the economic cost of maintaining the denitrification equipment.

[0042] The above description is only a preferred embodiment of the present embodiment and is not intended to limit the present embodiment. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present embodiment shall be included in the protection scope of the present embodiment.

Claims

1. A smoke sampling and detection device, comprising a sampling probe with one end inserted into a smoke channel (9), characterized in that: The sampling probe comprises a filter cartridge (1), a filter core sleeve (2) and a backflush assembly (3); the filter cartridge (1) is a U-shaped cartridge with one end blocked; the filter core sleeve (2) is coaxially sleeved on the outer periphery of the filter cartridge (1); a flow gap is provided between the filter core sleeve (2) and the filter cartridge (1); the filter core sleeve (2) has an open end connected to the flue gas channel (9); one blocked end of the filter cartridge (1) corresponds to the open end; and the other end of the filter cartridge (1) is connected to a sampling pipeline (5); The back-blowing assembly (3) comprises a guide protrusion (31) and a first back-blowing pipeline (32); the guide protrusion (31) is arranged in the flow gap; the first back-blowing pipeline (32) is communicated with the flow gap; the filter cartridge (1), the filter element sleeve (2) and the guide protrusion (31) are enclosed to form a back-blowing flow channel; and the air outlet of the back-blowing flow channel is arranged corresponding to the air inlet of the filter element sleeve (2).

2. The smoke sampling and detection equipment according to claim 1, characterized in that: The flow guide protrusion (31) is spirally wound around the inner wall of the filter element sleeve (2) with the axis of the filter cartridge (1) as the center, and is located in the flow gap.

3. The smoke sampling and detection equipment according to claim 1, characterized in that: The backflush assembly (3) further comprises a second backflush pipeline (33) connected to the open end of the filter cartridge (1).

4. The smoke sampling and detection equipment according to claim 3, characterized in that: The sampling probe further comprises a connecting sleeve (4) sleeved on the outer periphery of the filter cartridge sleeve (2); a connecting hole is provided on the outer wall of the flue gas passage (9) corresponding to the connecting sleeve (4); the connecting sleeve (4) is used to form a sealed connection between the filter cartridge sleeve (2) and the connecting hole.

5. The smoke sampling and detection equipment according to claim 4, characterized in that: The sampling probe further comprises a connecting flange (6), one end face of which is in sealing contact with the connecting sleeve (4) and the filter cartridge sleeve (2) and is connected to the open end of the filter cartridge (1), and the other end face of which is connected to the sampling pipeline (5) and the second backflush pipeline (33).

6. The smoke sampling and detection equipment according to claim 3, characterized in that: The first back-blowing pipeline (32) is connected to a first back-blowing solenoid valve (321), the second back-blowing pipeline (33) is connected to a second back-blowing solenoid valve (331), and the sampling pipeline (5) is connected to a sampling solenoid valve (51).

7. The smoke sampling and detection equipment according to claim 6, characterized in that: Along the purge direction of the first back-blow pipeline (32), a first gas source and a first filter connected to the first back-blow pipeline (32) are sequentially provided upstream of the first back-blow solenoid valve (321); along the purge direction of the second back-blow pipeline (33), a second gas source and a second filter connected to the second back-blow pipeline (33) are sequentially provided upstream of the second back-blow solenoid valve (331).

8. The smoke sampling and detection equipment according to claim 7, characterized in that: The smoke sampling and detection equipment further comprises a gas analyzer (7) and a distribution box (8); the gas analyzer (7) is connected to the sampling solenoid valve (51) via the sampling pipeline (5); and the distribution box (8) is electrically connected to the gas analyzer (7).

9. A denitration system for a thermal power plant, characterized in that: Comprising the smoke sampling and detection equipment as described in any one of claims 1 to 8.

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