Anti-blocking device for converter differential pressure sampling tube

Abstract

The present application relates to converter process technical field, especially a kind of converter differential pressure sampling tube anti-blocking and clearing device, including converter fume hood, valve, primary sampling tube, sampling tube ring pipe, secondary sampling tube, micro differential pressure transmitter, ring pipe end, ring pipe pig, pig wire and power device;Primary sampling tube is inserted into converter fume hood by sampling hole respectively, sampling tube ring pipe two ends are not connected and each is equipped with a ring pipe end, ring pipe pig is arranged in sampling tube ring pipe and two ends are connected pig wire, pig wire is connected power device outside sampling tube ring pipe respectively;Sampling tube is also connected micro differential transmitter and purge system by valve respectively;The present application reduces the probability that primary sampling tube at furnace mouth is affected by high-temperature dust particles and causes blockage, improves sampling efficiency, realizes on-line pigging function for particulate matter in sampling tube ring pipe, provides a kind of device for automatically cleaning sampling tube ring pipe, reduces the influence caused by ring pipe blockage on measurement.

Description

Technical Field

[0001] This invention relates to the field of converter process technology, and in particular to a converter micro differential pressure sampling tube anti-clogging and unclogging device. Background Technology

[0002] With the implementation of the dual-carbon strategy, steel companies are paying more and more attention to converter energy efficiency. The goal of the converter process is to maximize the recovery of high-calorific-value converter gas generated during the smelting process.

[0003] Currently, domestic steel enterprises generally use dry or wet dust removal processes to recover converter gas with acceptable oxygen content and calorific value in their steelmaking processes. There is a certain gap between the converter inlet and the converter's movable fume hood, and the flue gas is drawn in under negative pressure by a dust removal fan at the end of the flue.

[0004] The calorific value and quantity of converter gas recovered by dry dust removal in converters are primarily affected by the differential pressure at the furnace inlet. When the furnace pressure exceeds the ambient pressure, flue gas overflows, polluting the environment and reducing the amount of gas recovered. Conversely, when the furnace pressure is lower than the ambient pressure, air is drawn in through the furnace inlet, oxidizing CO in the gas into CO2 and reducing the calorific value of the recovered gas. Accurate measurement of the pressure differential is crucial for ensuring the stable operation of the dry dust removal system and improving the quality of the recovered gas.

[0005] The existing differential pressure system at the furnace mouth is not operating well, mainly because the pressure sampling tube is severely clogged due to the influence of high-temperature dusty furnace gas and splashed particles at the furnace mouth. The existing sampling tube backflushing device cannot prevent the clogging of the sampling tube. Summary of the Invention

[0006] This invention provides a converter micro differential pressure sampling tube anti-clogging and unclogging device, which reduces the probability of blockage caused by high-temperature dust particles in the primary sampling tube at the furnace mouth, improves sampling efficiency, and realizes online tube cleaning function for particles in the sampling tube ring. It provides an automatic cleaning device for the sampling tube ring, reducing the impact of ring blockage on measurement.

[0007] To achieve the above objectives, the present invention employs the following technical solution: A converter differential pressure sampling tube anti-clogging and unclogging device includes a converter hood, a valve, a primary sampling tube, a sampling tube ring, a secondary sampling tube, a differential pressure transmitter, a ring end cap, a ring pig, pig wires, and a power unit. The converter hood has multiple sampling holes evenly distributed on it. The primary sampling tube is inserted into the converter hood through these sampling holes. The portion of the primary sampling tube protruding from the converter hood is connected to the sampling tube ring via the valve. The sampling tube ring is fitted around the outside of the converter hood, and the two ends of the sampling tube ring are not connected. Each sampling tube is equipped with a ring end cap. The ring tube pig is installed inside the sampling tube ring. Both ends of the ring tube pig are connected to pig leads. The pig leads at both ends pass through the corresponding ring end caps and are connected to the power unit outside the sampling tube ring. The power unit can drive the ring tube pig to reciprocate inside the sampling tube ring through the pig leads. The sampling tube ring is connected to the secondary sampling tube. The secondary sampling tube is divided into two paths. One path is connected to the purging system through a valve, and the other path is connected to the differential transmitter through a valve.

[0008] Furthermore, the number of sampling holes is 2 to 5.

[0009] Furthermore, it also includes a conical anti-clogging wear-resistant cover connector and a conical anti-clogging wear-resistant cover. The conical anti-clogging wear-resistant cover connector consists of three rollers, which are conical in shape. The top surface of the cone is connected to a primary sampling tube, and the bottom surface of the cone is connected to the conical anti-clogging wear-resistant cover.

[0010] Furthermore, the ring end cap includes flange bolts, a ring plug plate, a ring flange, flange nuts, a graphite sealing ring baffle, a graphite sealing ring gland, bolts, and a graphite sealing ring. The ring plug plate and the ring flange are installed together by flange bolts and flange nuts and fixed to the sampling ring pipe. The ring plug plate and the ring flange have through holes of the same size and perpendicular to the contact end face at their centers. The graphite sealing ring baffle is fixedly connected to the through hole on the side of the ring plug plate closest to the sampling ring pipe by bolts, and the graphite sealing ring gland is fixedly connected to the other side of the through hole by bolts. The graphite sealing ring is set in the through hole between the graphite sealing ring baffle and the graphite sealing ring gland. The pig wire passes through the center of the graphite sealing ring and simultaneously passes through the entire through hole, the graphite sealing ring baffle, and the graphite sealing ring gland to prevent gas leakage.

[0011] Furthermore, the loop pig includes a loop pig body, loop pig lifting rings, and a pig scraper. The loop pig body is provided with loop pig lifting rings at both ends along its reciprocating direction. The loop pig body is provided with pig scrapers at both ends facing the inner wall of the sampling loop pipe. The pig scrapers are used to scrape off the deposits on the inner wall of the sampling loop pipe.

[0012] Furthermore, the conical anti-clogging and wear-resistant cover is coated with ceramic and antistatic coatings.

[0013] Furthermore, the distance between the conical anti-clogging wear-resistant cover and the sampling hole is: H = (1.0 ~ 1.5) × D 孔 ; The bottom diameter of the conical anti-clogging wear-resistant cover is: D = (2.0~3.0) × D 孔 ; Among them, D 孔 The diameter of the sampling hole.

[0014] Furthermore, the diffusion angle of the conical anti-clogging wear-resistant cover is 40-45°.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1) Solved the problem of large particle splashes clogging the primary sampling tube; 2) Solved the problem of blockage caused by particulate matter directly impacting the primary sampling tube; 3) Solved the problem of particulate matter clogging inside the sampling loop; 4) It reduces the probability of smelting splashes and dust particles clogging the sampling tube, thus improving its long-term operational reliability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the device described in this invention.

[0017] Figure 2 This is a schematic diagram of the structure of the ring pipe end cap described in this invention.

[0018] Figure 3 This is a schematic diagram of the connection structure of the primary sampling tube, the conical anti-clogging wear-resistant cover connector, and the conical anti-clogging wear-resistant cover described in this invention.

[0019] Figure 4 This is a schematic diagram of the structure of the ring pipe pig described in this invention.

[0020] In the diagram: 1. Converter hood; 2. Valve; 3. Primary sampling tube; 4. Sampling tube ring; 5. Secondary sampling tube; 6. Differential pressure transmitter; 7. Ring end cap; 8. Ring pig; 9. Pig lead wire; 10. Conical anti-clogging wear-resistant cover connector; 11. Conical anti-clogging wear-resistant cover; 12. Flange bolt; 13. Ring plug plate; 14. Ring flange; 15. Flange nut; 16. Graphite sealing ring baffle; 17. Graphite sealing ring gland; 18. Bolt; 19. Graphite sealing ring; 20. Power unit; 21. Ring pig lifting ring; 22. Pig scraper. Detailed Implementation

[0021] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings: See Figure 1This is a schematic diagram of the structure of the present invention. The present invention provides a converter micro-differential pressure sampling tube anti-clogging and unclogging device, comprising a converter hood 1, a valve 2, a primary sampling tube 3, a sampling tube ring 4, a secondary sampling tube 5, a micro-differential pressure transmitter 6, a ring hood end cap 7, a ring hood pig 8, a pig wire 9, a power unit 20, a conical anti-clogging wear-resistant cover connector 10, and a conical anti-clogging wear-resistant cover 11. The converter hood 1 is evenly provided with three sampling holes. Three primary sampling tubes 3 are inserted into the converter hood 1 through their respective sampling holes. The primary sampling tubes 3 are evenly distributed along the outer circumference of the converter hood 1, spaced at 120° intervals. The portion of the primary sampling tube 3 protruding from the converter hood 1 is connected to the sampling tube ring 4 via the valve 2. The valve 2 can be closed to inspect the sampling tube ring 4. A conical anti-clogging wear-resistant cover 11 is installed directly below the center of the primary sampling tube 3. The anti-clogging and wear-resistant cover connector 10 is welded to the sampling tube, which reduces the clogging of the primary sampling tube 3 by using physical shielding and airflow guidance. The sampling tube ring 4 is sleeved around the outside of the converter hood 1. The two ends of the sampling tube ring 4 are not connected and each is provided with a ring end cap 7. The ring pig 8 is set inside the sampling tube ring 4. The two ends of the ring pig 8 are connected to the pig wires 9. The pig wires 9 at both ends pass through the corresponding ring end caps 7 and are connected to the power device 20 outside the sampling tube ring 4. The power device 20 can drive the ring pig 8 to reciprocate inside the sampling tube ring 4 through the pig wires 9. The sampling tube ring 4 is connected to the secondary sampling tube 5. The secondary sampling tube 5 is divided into two paths. One path is connected to the purging system through valve 2, and the other path is connected to the differential transmitter through valve 2.

[0022] The conical anti-clogging wear-resistant cover connector 10 consists of three rollers, which are arranged in a conical shape. The top surface of the conical shape is connected to the primary sampling tube 3, and the bottom surface of the conical shape is connected to the conical anti-clogging wear-resistant cover 11. The conical anti-clogging wear-resistant cover 11 has an umbrella-shaped conical structure. The bottom side of the conical anti-clogging wear-resistant cover 11 is connected to the roller of the conical anti-clogging wear-resistant cover connector 10. The annular component of the conical anti-clogging wear-resistant cover connector 10 is connected to the primary sampling tube 3. The conical anti-clogging wear-resistant cover 11 uses physical shielding and airflow guidance to prevent large particles from falling vertically into the sampling hole, so that the high-temperature flue gas flows around the outer surface of the umbrella-shaped cover, forming a low-pressure zone under the umbrella, inducing the flue gas to converge from the edge of the umbrella to the central sampling hole, but avoiding direct impact of particles on the sampling hole. Based on the flue gas temperature of 1500℃, high-temperature resistant steel 310S is selected. To prevent electric sparks caused by particle impact, a 2mm thick polyaniline coating is applied to the steel. This polymer coating can conduct away static electricity in time, preventing the accumulation of static electricity from generating electric sparks, and can also resist the impact and wear of particles in the flue gas. The distance between the conical anti-clogging wear-resistant cover and the sampling hole is: H = (1.0 ~ 1.5) × D 孔 ; D孔 =50mm, H is 60mm; Install three conical anti-clogging and wear-resistant covers 11 directly above the sampling hole at a position 60mm above the top. This distance provides enough space to form an annular air intake channel, forming an effective buffer zone, allowing flue gas to flow around, while preventing splashed droplets from falling directly in. The bottom diameter of the conical anti-clogging wear-resistant cover is: D = (2.0~3.0) × D 孔 ; With D set to 100mm, the typical splash particle size is ≤100mm, providing sufficient coverage and effectively blocking splash droplets. The annular air intake area is ample and matches the DN50 hole, forming a good shielding angle. The diffusion angle of the conical anti-clogging wear-resistant hood is 45°. The diffusion angle refers to the angle between the generatrix of the umbrella-shaped hood and the axis, which determines its "opening degree". A small diffusion angle θ (sharp) has strong flow guidance, but a small shielding area; a large θ (gentle) has good shielding, but is prone to ash accumulation and has high flow resistance. θ=45° is selected because this angle performs well in experimental and industrial applications. It can both guide the flow and prevent ash accumulation, which is conducive to the sliding of flue gas along the umbrella surface, reduces particle adhesion, and avoids the formation of "ash trapping" structure. After setting the conical anti-clogging and wear-resistant cover, the annular area is calculated according to the concentric circle theory: ; A=9341mm 2 However, the actual air intake is a lateral circumferential seam, so it should be calculated based on the circumferential side area. Using the umbrella-shaped shroud bottom as the base, H = tanθ × D / 2; A = effective circumference × air intake height = 3.14 × 120 × 60 = 22608 mm²; sampling hole area = π × (D / 2) 孔 / 2) 2 =3.14×25×25=1962mm 2 The annular air intake area is greater than 3 times the sampling port area, indicating that it will not cause throttling. The typical converter flue gas flow rate is Q. Assuming that the total flow rate is evenly distributed among the three orifices, after adding the conical anti-clogging and wear-resistant cover 11, the inlet annular area increases, the airflow is dispersed, and there is no direct impact on the orifice. The initial velocity of the molten metal splash is about 5 to 15 m / s. Affected by gravity and airflow, H=60 mm can effectively block droplets with a splash angle >60°. The droplets slide back into the furnace along the umbrella surface. The design parameters are summarized in Table 1: Table 1 parameter numerical values <![CDATA[ Sampling hole diameter D 孔 ]]> 50mm Number of holes 3 flue gas temperature 1500℃ flue gas velocity 8~15m / s Umbrella parameters D=100mm, H=60mm, θ=45° Dust particles adsorbed inside the loop pipe sometimes harden and cannot be removed in time by the backflushing design, causing the rough pipe surface to adhere more and more quickly. A pipe cleaner with a diameter of Φ45 is installed on the DN50 pipe, mainly to handle hard and strongly adhering particles. The loop pipe cleaner 8 includes a loop pipe cleaner body, a loop pipe cleaner lifting ring 21, and a pipe cleaner scraper 22. The two ends of the loop pipe cleaner body along its reciprocating direction are respectively connected to the loop pipe cleaner lifting ring 21 by threads. The two ends of the loop pipe cleaner body facing the inner wall of the sampling pipe loop pipe 4 are respectively provided with the pipe cleaner scraper 22. The loop pipe cleaner 8 is connected to the wire through the loop pipe cleaner lifting ring 21. The loop pipe cleaner lifting ring 21 is connected to the loop pipe cleaner 8 by threads. The wire is smooth on the outside and is powered by the rotation of an external power device 20. Through reciprocating motion, it cleans the dust and particles inside the sampling pipe loop pipe 4 and delivers the dust and particles adhering to the inner wall to the end of the sampling pipe loop pipe 4.

[0023] The annular end cap 7 includes flange bolts 12, annular end cap 13, annular flange 14, flange nuts 15, graphite sealing ring baffle 16, graphite sealing ring gland 17, bolts 18, and graphite sealing ring 19. Annular flanges 14 are provided at both ends of the sampling tube annular tube 4. The annular end cap 13 is fixed to the annular flanges 14 by flange bolts 12 and flange nuts 15, and is also fixed to the sampling tube annular tube 4. The annular end cap 13 has a through hole perpendicular to the contact end face. A graphite sealing ring baffle 16 is fixedly connected to the through hole on one side of the annular end cap 13 near the sampling tube annular tube 4 by bolts 18, and a graphite sealing ring gland is fixedly connected to the other side of the through hole by bolts 18. 17. The graphite sealing ring 19 is set in the through hole between the graphite sealing ring baffle 16 and the graphite sealing ring cover 17. The pig wire 9 passes through the center of the graphite sealing ring 19 and passes through the entire through hole, the graphite sealing ring baffle 16 and the graphite sealing ring cover 17. The sealing ring gap is adjusted by the bolts 18 on the graphite sealing ring cover 17 to prevent gas leakage. The operation of the ring pig 8 is controlled by the forward and reverse rotation of the power device 20. The sampling ring 4 is connected to the differential pressure transmitter 6 and the purging pipe through the secondary sampling pipe 5 to perform normal pressure measurement and purging work. It is used once a day or in case of abnormality. The backflushing operation is performed normally at other times.

[0024] In the flue gas sampling section, the power unit 20 stops, the loop pig 8 stops at the end of the sampling loop 4, the valve 2 on the primary sampling pipe 3 opens, the valve 2 before the differential pressure transmitter 6 opens, the purge pipe valve 2 closes, and the flue gas enters the differential pressure transmitter 6 through the primary sampling pipe 3, the sampling loop 4, and the secondary sampling pipe 5, so that the differential pressure transmitter can detect the flue gas pressure. In the non-sampling section of flue gas, valve 2 before the differential pressure transmitter 6 is closed, and valve 2 of the purge pipe is opened to introduce high-pressure nitrogen for intermittent purging. At the same time, the power unit 20 is running, driving the ring pipe pig 8 to clean the dust and particulate matter inside the sampling ring pipe 4. When the purging time ends, valve 2 of the purge pipe is closed, valve 2 before the differential pressure transmitter 6 is opened, power unit 20 is stopped, and the purging work ends. During the converter shutdown, valve 2 on the primary sampling tube 3 can be closed, the ring tube plug 13 can be opened, and the power unit 20 can be used to move the ring tube cleaner 8 to the end of the sampling tube ring tube 4 to clean the dust and particulate matter accumulated inside the sampling tube ring tube 4, and check the actual condition of the ring tube cleaner 8 and the sampling tube ring tube 4.

[0025] The above embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operation processes. However, the scope of protection of the present invention is not limited to the above embodiments. Unless otherwise specified, the methods used in the above embodiments are conventional methods.

Claims

1. A device for preventing and clearing blockages in a converter differential pressure sampling tube, comprising a converter fume hood; characterized in that, It also includes valves, a primary sampling tube, a sampling tube loop, a secondary sampling tube, a differential pressure transmitter, loop end caps, a loop pig, pig wires, and a power unit. The converter hood has multiple sampling holes evenly distributed on it. The primary sampling tubes are inserted into the converter hood through these sampling holes. The portion of the primary sampling tube protruding from the converter hood is connected to the sampling tube loop via a valve. The sampling tube loop is fitted around the outside of the converter hood. The two ends of the sampling tube loop are not connected and each end has a loop end cap. The loop pig is installed inside the sampling tube loop. Both ends of the loop pig are connected to pig wires, which pass through the corresponding loop end caps and connect to the power unit outside the sampling tube loop. The power unit, through the pig wires, drives the loop pig to reciprocate within the sampling tube loop. The sampling tube loop connects to the secondary sampling tube, which is divided into two paths: one path connects to the purging system via a valve, and the other path connects to the differential pressure transmitter via a valve.

2. The converter micro differential pressure sampling tube anti-clogging and unclogging device according to claim 1, characterized in that, The number of sampling holes is 2 to 5.

3. The converter micro differential pressure sampling tube anti-clogging and unclogging device according to claim 1, characterized in that, It also includes a conical anti-clogging wear-resistant cover connector and a conical anti-clogging wear-resistant cover. The conical anti-clogging wear-resistant cover connector consists of three rollers. The rollers are conical in shape. The top surface of the cone is connected to a primary sampling tube, and the bottom surface of the cone is connected to the conical anti-clogging wear-resistant cover.

4. The converter micro differential pressure sampling tube anti-clogging and unclogging device according to claim 1, characterized in that, The ring end cap includes flange bolts, a ring plug plate, a ring flange, flange nuts, a graphite sealing ring baffle, a graphite sealing ring gland, bolts, and a graphite sealing ring. The ring plug plate and the ring flange are installed together by flange bolts and flange nuts and fixed to the sampling ring. The ring plug plate and the ring flange have through holes of the same size and perpendicular to the contact end face at their centers. The graphite sealing ring baffle is fixedly connected to the through hole on the side of the ring plug plate closest to the sampling ring by bolts, and the graphite sealing ring gland is fixedly connected to the other side of the through hole by bolts. The graphite sealing ring is set in the through hole between the graphite sealing ring baffle and the graphite sealing ring gland. The pig wire passes through the center of the graphite sealing ring and simultaneously passes through the entire through hole, the graphite sealing ring baffle, and the graphite sealing ring gland to prevent gas leakage.

5. The converter micro differential pressure sampling tube anti-clogging and unclogging device according to claim 1, characterized in that, The loop pig includes a loop pig body, loop pig lifting rings, and a pig scraper. The loop pig body has loop pig lifting rings at both ends along its reciprocating direction. The loop pig body has pig scrapers at both ends facing the inner wall of the sampling loop. The pig scrapers are used to scrape off the deposits on the inner wall of the sampling loop.

6. The converter micro differential pressure sampling tube anti-clogging and unclogging device according to claim 1, characterized in that, The conical anti-clogging and wear-resistant cover is coated with ceramic and antistatic coating.

7. The converter micro differential pressure sampling tube anti-clogging and unclogging device according to claim 1, characterized in that, The distance between the conical anti-clogging wear-resistant cover and the sampling hole is: H=(1.0~1.5)×D 孔 ; The bottom diameter of the conical anti-clogging wear-resistant cover is: D = (2.0~3.0) × D 孔 ; Among them, D 孔 The diameter of the sampling hole.

8. The converter micro differential pressure sampling tube anti-clogging and unclogging device according to claim 1, characterized in that, The diffusion angle of the conical anti-clogging wear-resistant cover is 40-45°.

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