Large-diameter sampling backflush device

Abstract

The utility model provides a large -calibre sampling back flush device, it is small and easy to install, has acid corrosion resistance, will not increase the smoke dust appearance suction resistance, can guarantee smoke dust appearance sampling flow velocity, including the air inlet elbow, sampling probe, sampling heat tracing pipe who connects gradually in the flue gas access direction, sampling heat tracing pipe links with vaporization chamber through back flush spare, back flush spare is T type three way structure, back flush solenoid valve is connected with back flush spare, to make compressed air after back flush solenoid valve enters back flush spare, back flush spare includes base, upper cover and rectifier spare, rectifier spare is sleeved on the base, and forms rectification gap between rectifier spare and base, upper cover is connected on the base outside through screw thread, and forms storage pressure chamber between upper cover and base outer wall, upper cover is equipped with the air inlet of intercommunication, air inlet is connected with back flush solenoid valve, rectifier spare upper end passes through the opening of upper cover, and rectifier spare outer wall is opened in ring and is equipped with a plurality of air inlet through -hole.

Description

Technical Field

[0001] This utility model relates to the field of flue gas treatment technology, specifically to a large-diameter sampling backflushing device. Background Technology

[0002] When coal-fired power plants using wet desulfurization processes measure particulate matter concentration online at their emission outlets, they need to use an extraction-type dust collector with flue gas pretreatment function. This is because the flue gas temperature after wet desulfurization is only 40-60℃, and the flue gas contains a large amount of liquid water droplets and water mist, which makes it impossible for optical measuring instruments to measure directly. It is necessary to extract the flue gas from the flue and heat it to a dry flue gas state before measurement. Therefore, the extraction-type dust collector is designed with sampling probes, heat tracing pipes and other sampling devices, and the sampling pipeline is regularly backflushed and cleaned. An existing dust collector uses a large-diameter heated pipe to transport dust-laden flue gas, which can effectively increase the sampling efficiency of dust-laden flue gas and reduce the risk of pipeline blockage. However, the existing dust collector uses a three-way solenoid valve to connect to the dust collector for sampling and ventilation. However, the three-way solenoid valve is limited by the small pipe diameter, so a reducer is needed to reduce the diameter of the inlet and outlet before it can be connected. However, the installation of the reducer creates a blockage point, which greatly increases the sampling resistance of the dust collector and prevents the dust collector from sampling and measuring normally. Another solution is to replace the three-way solenoid valve with a three-way electric valve to solve the pipe diameter problem. However, the three-way electric valve is large and heavy, while the internal space of the dust collector is limited, which brings great difficulties to the actual installation. At the same time, it also has the problems of slow gas path switching and the metal valve body is not resistant to acid corrosion.

[0003] Therefore, developing a compact and convenient backflush device has high practical and commercial value. Utility Model Content

[0004] To address the aforementioned issues, this invention provides a large-diameter sampling backflushing device, which is compact, easy to install, resistant to acid corrosion, does not increase the suction resistance of the dust collector, and ensures the sampling flow rate of the dust collector.

[0005] This utility model adopts the following technical solution: a large-diameter sampling backflushing device, including an air inlet elbow, a sampling probe, and a sampling heat tracing pipe connected sequentially along the flue gas inlet direction. The sampling heat tracing pipe is connected to the vaporization chamber through a backflushing component. The backflushing component is a T-shaped three-way structure. A backflushing solenoid valve is connected to the backflushing component so that compressed air enters the backflushing component after passing through the backflushing solenoid valve. The backflushing component includes a base, a top cover, and a rectifier. The rectifier is sleeved on the base, forming a rectifier gap with the base. The top cover is threaded to the outside of the base, forming a pressure storage chamber with the outer wall of the base. The top cover has a communicating air inlet, which is connected to the backflushing solenoid valve. The upper end of the rectifier passes through the opening of the top cover, and the outer wall of the rectifier has several air inlet holes circumferentially opened.

[0006] Furthermore, the base is a tubular structure with a circumferential protrusion on the base and an external thread on the outer wall of the protrusion. The rectifier is fitted onto the base located above the protrusion. Furthermore, the upper cover has a tubular structure, and the inner wall of the lower part of the upper cover is provided with internal threads. The air inlet is located above the internal threads, and the upper cover and the protrusion are connected by threads. Furthermore, the rectifier is a stepped tubular structure, the air inlet is arranged at the lower part of the rectifier, the upper part of the rectifier passes through the opening of the top cover, the upper part of the base is higher than the position of the air inlet, and the air inlet corresponds to the position of the air inlet; the connecting part between the upper and lower parts of the rectifier abuts against the top cover. Furthermore, the inner cavity diameter of the lower part of the rectifier decreases along the axis of the upper part of the rectifier to form a rectifier cavity with guidance; Furthermore, a groove is provided circumferentially on the inner top surface of the upper cover, and a sealing ring is provided in the groove to form a seal with the connection part of the rectifier; Furthermore, the backflush component is made of PEEK material that is resistant to acid corrosion.

[0007] The beneficial effects of this utility model are that the sampling heat tracing pipe is connected to the vaporization chamber through the backflush component, and the backflush solenoid valve is connected to the backflush component. By setting the backflush component, the original sampling diameter can be retained, and the overall size is small and easy to install. It will not increase the suction resistance of the dust collector and ensure the sampling flow rate of the dust collector, thus having a strong market competitiveness. Attached Figure Description

[0008] Figure 1 This is a connection diagram of this utility model; Figure 2 This is an exploded structural diagram of the backflush component in this utility model; Figure 3 This is a schematic diagram of the assembly structure of the backflush component in this utility model. Detailed Implementation

[0009] like Figure 1 , Figure 2 , Figure 3 As shown, the large-diameter sampling backflushing device of this utility model includes an air inlet elbow 13, a sampling probe 14, and a sampling heat tracing pipe 15 connected sequentially along the flue gas inlet direction. The sampling heat tracing pipe 15 is connected to the vaporization chamber 17 through a backflushing component 16. The backflushing component 16 has a T-shaped three-way structure. The backflushing solenoid valve 18 is connected to the backflushing component 16 so that compressed air 23 enters the backflushing component 16 after passing through the backflushing solenoid valve 18. The backflushing component 16 includes a base 1, a top cover 3, and a rectifier 2. The rectifier 2 is sleeved on the base 1 and forms a rectifier gap 19 between it and the base 1. The top cover 3 is threaded to the outside of the base 1 and forms a pressure storage chamber 20 between it and the outer wall of the base 1. The top cover 3 is provided with a communicating air inlet 4, which is connected to the backflushing solenoid valve 18. The upper end of the rectifier 2 passes through the opening of the top cover 3, and the outer wall of the rectifier 2 is provided with several air inlet holes 5 circumferentially.

[0010] The base 1 is a tubular structure with a circumferential protrusion 10 on the base 1. The outer wall of the protrusion 10 is provided with an external thread 8. The rectifier 2 is fitted onto the base 1 located above the protrusion 10.

[0011] The upper cover 3 is a tubular structure. The inner wall of the lower part of the upper cover 3 is provided with internal threads 9. The air inlet 4 is located above the internal threads 9. The upper cover 3 and the protrusion 10 are connected by threads.

[0012] The rectifier 2 is a stepped tubular structure. The air inlet 5 is arranged at the lower part of the rectifier 2. The upper part of the rectifier 2 passes through the opening of the upper cover 3. The upper part of the base 1 is higher than the position of the air inlet 5. The position of the air inlet 4 corresponds to that of the air inlet 5. The connecting part 21 between the upper and lower parts of the rectifier 2 abuts against the upper cover 3. The inner diameter of the lower part of the rectifier 2 decreases along the axis of the upper part of the rectifier 2 to form a rectifier cavity 22 with guidance.

[0013] The top surface of the inner part of the upper cover 3 has a circumferential groove 11, and a sealing ring 12 is provided in the groove 11 to form a seal with the connection part 21 of the rectifier 2, which can ensure airtightness. The backflush part 16 is made of PEEK material that is resistant to acid corrosion.

[0014] The working principle of this utility model is as follows: when the backflush solenoid valve 18 is opened, compressed air enters the backflush component 16 and forms a unidirectional high-pressure airflow in the backflush component 16. The hot air in the high-temperature vaporization chamber 17 is drawn in downstream and mixed with the compressed air. The sampling heat tracing pipe 15, the sampling probe 14 and the air inlet elbow 13 are sampled in sequence to perform high-temperature purging. The upper part of the rectifier 2 serves as the upstream sampling interface 7 and the lower part of the base 1 serves as the downstream sampling interface 6. The downstream sampling interface 6 and the upstream sampling interface 7 can be directly connected to the original dust collector sampling pipeline to complete the installation. The downstream sampling interface 6 and the upstream sampling interface 7 maintain the original large-diameter size and can be directly connected to the original large-diameter pipeline of the dust collector. The compressed air enters the pressure storage chamber 20 through the air inlet 4 and then enters the rectifier 2 through the eight air inlet holes 5 that are matched with the position of the air inlet 4. After passing through the rectification gap 19, it flows into the guide rectification chamber 22 and flows out evenly from the upstream sampling interface 7 after rectification.

[0015] In summary, this invention does not increase the suction resistance of the dust collector, retains the large-diameter pipe connection of the original dust collector, thus enabling large-diameter flow and ensuring the sampling flow rate of the dust collector; moreover, the overall structure is compact and easy to install, has acid and corrosion resistance, and can realize unidirectional backflushing function with minimal compressed air pressure loss.

[0016] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0017] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A large-diameter sampling backflushing device, comprising an inlet elbow, a sampling probe, and a sampling heat tracing pipe connected sequentially along the flue gas inlet direction, characterized in that: The sampling heat tracing pipe is connected to the vaporization chamber through a backflush component. The backflush component is a T-shaped three-way structure. A backflush solenoid valve is connected to the backflush component so that compressed air enters the backflush component after passing through the backflush solenoid valve. The backflush component includes a base, a top cover, and a rectifier. The rectifier is sleeved on the base and forms a rectifier gap with the base. The top cover is threaded to the outside of the base and forms a pressure storage chamber with the outer wall of the base. The top cover is provided with a communicating air inlet, which is connected to the backflush solenoid valve. The upper end of the rectifier passes through the opening of the top cover, and the outer wall of the rectifier is provided with several air inlet holes circumferentially.

2. The large-diameter sampling backflush device according to claim 1, characterized in that: The base is a tubular structure with a circumferential protrusion on the base. The outer wall of the protrusion is provided with external threads. The rectifier is fitted onto the base located above the protrusion.

3. The large-diameter sampling backflush device according to claim 2, characterized in that: The top cover is a tubular structure, and the inner wall of the lower part of the top cover is provided with internal threads. The air inlet is located above the internal threads, and the top cover and the protrusion are connected by threads.

4. The large-diameter sampling backflush device according to claim 1, characterized in that: The rectifier is a stepped tubular structure. The air inlet is located at the lower part of the rectifier. The upper part of the rectifier passes through the opening of the top cover. The upper part of the base is higher than the location of the air inlet. The air inlet corresponds to the location of the air inlet. The connecting part between the upper and lower parts of the rectifier abuts against the top cover.

5. The large-diameter sampling backflush device according to claim 4, characterized in that: The inner diameter of the lower part of the rectifier decreases along the axis of the upper part of the rectifier to form a rectifier cavity with guidance.

6. The large-diameter sampling backflush device according to claim 4, characterized in that: The top surface inside the upper cover has a circumferential groove, and a sealing ring is provided in the groove to form a seal with the connection part of the rectifier.

7. The large-diameter sampling backflush device according to claim 1, characterized in that: The backflush component is made of PEEK material that is resistant to acid corrosion.

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