Venturi ejector pull-through apparatus and method of use

Abstract

The present application relates to a kind of venturi ejector free dismantling purging device and method, purging device includes venturi ejector, steam pipeline and mixed gas pipeline, venturi ejector is set up upper connecting section, left connecting section, right connecting section and lower connecting section, lower connecting section is communicated with the gas pipeline of being examined, one end of steam pipeline is communicated with left connecting section, middle section of steam pipeline is communicated with upper connecting section, right connecting section is communicated with mixed gas pipeline;Wherein, between upper connecting section and left connecting section Steam pipeline is set first valve, upper connecting section is set second valve, lower connecting section is set third valve, mixed gas pipeline is set fourth valve.The present application has good injection effect, with reliable structure, maintenance is convenient, can realize free dismantling purging, greatly improve maintenance efficiency.

Description

Technical Field

[0001] This invention relates to a purging device, and more specifically, to a purging device for a Venturi ejector that does not require disassembly and a method of using it. Background Technology

[0002] A dry quenching circulating gas analyzer is an instrument that uses paramagnetic oxygen technology to detect gas composition. It measures the circulating gas generated during the dry quenching process to determine the oxygen content. Existing dry quenching circulating gas analyzers with Venturi ejector needle devices are prone to clogging of the ejector hole during sampling, and maintenance procedures are cumbersome. Figure 1 As shown, this connection structure has the following main drawbacks: First, the operation is cumbersome when purging the pipeline. A wrench must be used to unscrew the hexagonal stud, then a Phillips head screwdriver must be used to unscrew the ejector pin, and finally the hexagonal stud must be reinstalled before purging can begin. Second, the ejector pin is easily deformed by high temperatures during sampling, causing blockage of the ejector orifice and preventing drainage. Third, slippage / wear at the cross-shaped opening of the ejector pin, failure of the internal threads at the upper / lower ends of the ejector, the external threads of the hexagonal stud, and the external threads of the ejector pin can lead to disassembly difficulties and affect sampling results. Therefore, it is necessary to propose a new structure to solve the above problems. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a venturi ejector purging device and its usage method that does not require disassembly. The device has good ejection performance, reliable structure, convenient maintenance, and can achieve purging without disassembly, thus greatly improving maintenance efficiency.

[0004] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0005] A Venturi ejector purging device without disassembly includes a Venturi ejector, a steam pipe, and a mixed gas pipe. The Venturi ejector is provided with an upper connecting section, a left connecting section, a right connecting section, and a lower connecting section. The lower connecting section of the Venturi ejector is connected to the gas pipe to be tested. One end of the steam pipe is connected to the left connecting section of the Venturi ejector. The middle section of the steam pipe is connected to the upper connecting section of the Venturi ejector. The right connecting section of the Venturi ejector is connected to the mixed gas pipe.

[0006] The steam pipe between the upper connecting section and the left connecting section is equipped with a first valve, the upper connecting section of the Venturi ejector is equipped with a second valve, the lower connecting section is equipped with a third valve, and the mixed gas pipe is equipped with a fourth valve.

[0007] In one embodiment, the inner diameter of the end of the steam pipe connected to the left connecting section is larger than the inner diameter of the left connecting section of the Venturi ejector, and the inner diameter of the middle section of the steam pipe connected to the upper connecting section is larger than the inner diameter of the upper connecting section of the Venturi ejector.

[0008] In one embodiment, the inner diameter of the gas mixture duct is larger than the inner diameter of the right connecting section of the Venturi ejector.

[0009] In one embodiment, the first valve, the second valve, the third valve, and the fourth valve are all electrically operated valves.

[0010] A method for using a Venturi ejector purge device without disassembly includes a sampling mode, a probe purge mode, and a mixed gas outlet purge mode. The specific steps are as follows:

[0011] Sampling mode: Open the first valve, the third valve and the fourth valve, and keep the second valve closed. At this time, the steam flow path is to enter the Venturi ejector from the left connecting section along the steam pipe and flow out from the mixed gas pipe. The Venturi ejector is connected to the gas pipe under test. The gas in the gas pipe under test flows into the Venturi ejector through the sampling probe and flows out with the steam for sampling.

[0012] Probe purging mode: Open the second and third valves, keep the first and fourth valves closed, connect the steam pipe to the gas pipe being tested, and the steam enters the sampling probe through the Venturi ejector for purging;

[0013] Mixed gas outlet purging mode: Open the first or second valve and the fourth valve, keep the third valve closed, and clean steam will be blown out from the mixed gas pipeline to purge the mixed gas outlet.

[0014] In one embodiment, in the mixed gas outlet purging mode, the first valve is opened while the second valve is kept closed to purge the left connecting section of the Venturi ejector; the second valve is opened while the first valve is kept closed to purge the upper connecting section of the Venturi ejector.

[0015] In one embodiment, the first valve, the second valve, the third valve, and the fourth valve are all electric valves, and the sampling mode, the probe purging mode, and the mixed gas outlet purging mode are automatically switched, wherein the probe purging mode and the mixed gas outlet purging mode are performed sequentially.

[0016] In one embodiment, the sampling probe, the mixed gas pipeline, and the Venturi ejector are purged sequentially, as follows:

[0017] First, open the second and third valves, while keeping the first and fourth valves closed, and purge the sampling probe. At the same time, purge the lower connecting section of the Venturi ejector.

[0018] After a period of time, open the fourth valve, close the third valve, keep the second valve open, keep the first valve closed, and purge the mixed gas pipeline. At the same time, purge the upper connecting section and the right connecting section of the Venturi ejector.

[0019] After a certain interval, open the first valve, close the second valve, keep the fourth valve open, and keep the third valve closed to purge the mixed gas pipeline. At the same time, purge the left and right connecting sections of the Venturi ejector.

[0020] In one embodiment, the time for purging the lower connecting section of the Venturi ejector is greater than or equal to the time for purging the right connecting section of the Venturi ejector, and the time for purging the left connecting section of the Venturi ejector is less than or equal to the time for purging the upper connecting section of the Venturi ejector.

[0021] In summary, the present invention has the following beneficial effects:

[0022] This invention achieves manual or automatic purging of the sampling probe and mixed gas outlet without disassembly by connecting the Venturi ejector to the valve. The ejection effect is good, and it has the advantages of being disassembly-free and easy to maintain. The invention has a reliable structure, saves time and effort, effectively simplifies the maintenance process of the pretreatment probe of the dry quenching coke circulating gas analyzer, and greatly improves work efficiency. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of an existing Venturi ejector sampling device;

[0024] Figure 2 This is a schematic diagram of the structure of the present invention.

[0025] In the diagram: 1-Gas pipeline under inspection, 2-Welded flange, 3-Groove, 4-Sampling probe, 5-Probe auxiliary flange, 6-Primary flange, 7-Left connecting section, 8-Right connecting section, 9-Venturi ejector, 10-Steam pipeline, 11-Mixed gas pipeline, 12-First valve, 13-Second valve, 14-Third valve, 15-Fourth valve, 16-Hexagonal stud, 17-Ejector needle cross-shaped opening, 18-Ejector needle. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] It is worth noting that the directional terms such as "up" and "down" used in this article are all relative to the perspective of the attached figures and are only for the purpose of description. They should not be interpreted as limitations on the technical solutions.

[0028] The existing Venturi ejector sampling device structure is as follows: Figure 1As shown, a connection port is opened on the side of the gas pipeline 1 to be inspected. A sampling probe 4 is installed in the connection port. The connection port is connected to the existing Venturi ejector sampling device through a flange structure. The operation is cumbersome when purging the pipeline. First, the hexagonal stud 16 is rotated out with a wrench. Then, the cross cutter is used to align the cross mouth 17 of the ejector needle and twist out the ejector needle 18. Finally, the hexagonal stud 16 is reinstalled before the pipeline can be purged, which increases the workload.

[0029] This invention improves upon existing Venturi ejector sampling devices, specifically comprising a Venturi ejector 9, a steam pipe 10, and a mixed gas pipe 11, as shown below. Figure 2 As shown, the Venturi ejector 9 has a cross-shaped structure and is equipped with an upper connecting section, a left connecting section 7, a right connecting section 8, and a lower connecting section. The lower connecting section of the Venturi ejector 9 is connected to the gas pipeline 1 under test through a flange structure. One end of the steam pipeline 10 is connected to the left connecting section 7 of the Venturi ejector 9, the middle section of the steam pipeline is connected to the upper connecting section of the Venturi ejector 9, and the right connecting section 8 of the Venturi ejector 9 is connected to the mixed gas pipeline 11. Among them, the steam pipeline 10 between the upper connecting section and the left connecting section 7 is equipped with a first valve 12, the upper connecting section of the Venturi ejector 9 is equipped with a second valve 13, the lower connecting section is equipped with a third valve 14, and the mixed gas pipeline 11 is equipped with a fourth valve 15. The first valve 12, the second valve 13, the third valve 14, and the fourth valve 15 are all normally closed valves.

[0030] This invention creates different gas flow paths and thus different operating modes by controlling the opening and closing of four valves. Specifically, the Venturi ejector non-removal purging device includes three operating modes: sampling mode, probe purging mode, and mixed gas outlet purging mode. The steps are as follows:

[0031] Sampling mode: Open the first valve 12, the third valve 14 and the fourth valve 15, and keep the second valve 13 closed. At this time, the steam flows along the steam pipe 10 from the left connecting section 7 into the Venturi ejector 9 and flows out from the mixed gas pipe 11. The Venturi ejector 9 is connected to the gas pipe 1 under test. During the steam flow, a local vacuum area is formed in the Venturi ejector 9. The gas in the gas pipe 1 under test flows into the Venturi ejector 9 through the sampling probe 4 and flows out with the steam, thereby realizing the sampling of the gas in the gas pipe 1 under test.

[0032] In sampling mode, since the left connecting section 7 and the right connecting section 8 of the Venturi ejector are connected to the steam pipe 10 and the mixed gas pipe 11, the pressure inside the Venturi ejector is lower than the pressure inside the tested gas pipe 1. The steam can only flow out from the mixed gas pipe 11 and will not enter the tested gas pipe 1. The local vacuum area formed inside the Venturi ejector 9 will instead draw out the gas inside the tested gas pipe 1, thereby realizing the sampling operation.

[0033] Probe purging mode: Open the second valve 13 and the third valve 14, keep the first valve 12 and the fourth valve 15 closed, connect the steam pipe 10 to the gas pipe 1 under test, and the steam enters the sampling probe 4 through the Venturi ejector 9, thereby purging the sampling probe 4.

[0034] Mixed gas outlet purging mode: Open the first valve 12 or the second valve 13, and open the fourth valve 15, while keeping the third valve 14 closed. At this time, the Venturi ejector 9 is not connected to the gas pipeline 1 being tested, and clean steam is blown out from the mixed gas pipeline 11, thereby achieving the purging of the mixed gas outlet.

[0035] In the mixed gas outlet purging mode, opening the first valve 12 and keeping the second valve 13 closed allows for purging of the left connecting section 7 of the Venturi ejector 9; opening the second valve 13 and keeping the first valve 12 closed allows for purging of the upper connecting section of the Venturi ejector 9.

[0036] Therefore, it is possible to set the first valve 12 to be opened first, while keeping the second valve 13 closed. After a certain interval, the second valve 13 is opened and the first valve 12 is closed, which also serves as a purging function for the Venturi ejector 9.

[0037] As can be seen from the three working modes mentioned above, the Venturi ejector purging device of the present invention enables the purging of the sampling probe 4 and the mixed gas outlet without disassembly, with good ejection effect and the advantages of being disassembly-free and easy to maintain.

[0038] like Figure 2 As shown, the inner diameter of the end of the steam pipe 10 connected to the left connecting section 7 is larger than the inner diameter of the left connecting section 7 of the Venturi ejector 9, and the inner diameter of the middle section of the steam pipe 10 connected to the upper connecting section is larger than the inner diameter of the upper connecting section of the Venturi ejector 9.

[0039] Furthermore, the inner diameter of the mixed gas pipeline 11 is larger than the inner diameter of the right connecting section 8 of the Venturi ejector 9.

[0040] In this invention, the first valve 12, the second valve 13, the third valve 14, and the fourth valve 15 are all electrically operated valves. Based on this, the sampling mode, the probe purging mode, and the mixed gas outlet purging mode can be automatically switched. The probe purging mode and the mixed gas outlet purging mode can be performed sequentially to purge the Venturi ejector 9, the sampling probe 4, and the mixed gas pipeline 11. The specific steps are as follows:

[0041] First, open the second valve 13 and the third valve 14, while keeping the first valve 12 and the fourth valve 15 closed, and purge the sampling probe 4. At the same time, purge the lower connecting section of the Venturi ejector 9.

[0042] After a period of time, open the fourth valve 15, close the third valve 14, keep the second valve 13 open, keep the first valve 12 closed, and purge the mixed gas pipeline 11. At the same time, purge the upper connecting section and the right connecting section 8 of the Venturi ejector 9.

[0043] After a period of time, open the first valve 12, close the second valve 13, keep the fourth valve 15 open, keep the third valve 14 closed, and purge the mixed gas pipeline 11. At the same time, purge the left connecting section 7 and the right connecting section 8 of the Venturi ejector 9.

[0044] After the above purging, the Venturi ejector 9, the sampling probe 4, and the mixed gas pipeline 11 were purged clean.

[0045] The technical solution of the present invention will be illustrated below through specific embodiments.

[0046] The side opening of the gas pipeline 1 under inspection is vertically and horizontally welded with a welding flange 2. The probe auxiliary flange 5 is fitted into the groove 3 of the welding flange 2. The welding flange 2 and the primary flange 6 are fixedly connected with bolts, thereby realizing the connection between the Venturi ejector 9 and the gas pipeline 1 under inspection.

[0047] A gasket is installed between the groove 3 of the welding flange 2 and the probe auxiliary flange 5, and a gasket is also installed between the primary flange 6 and the probe auxiliary flange 5.

[0048] When the first valve 12, the third valve 14, and the fourth valve 15 are operating, a pressure difference is created between the left connecting section 7 and the right connecting section 8 of the Venturi ejector 9, forming a vacuum zone within the Venturi ejector 9. This vacuum zone draws in gas from the gas pipeline 1 through the sampling probe 4. When the second valve 13 and the third valve 14 are operating, the sampling probe 4 is purged with steam. When the second valve 13, the first valve 12, or the fourth valve 15 is operating, the mixed gas pipeline 11 is purged with steam.

[0049] Because the gas in the pipeline during the dry quenching process contains a large amount of sulfides, tar and dust, under the existing Venturi ejector sampling device, each dry quenching system needs to perform pretreatment pipeline and sampling probe 4 purging work at least once a week, which requires a lot of manpower and resources. The present invention can realize manual / automatic pipeline purging without disassembly, which greatly improves purging efficiency.

[0050] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A purging device for a Venturi ejector that does not require disassembly, characterized in that, It includes a Venturi ejector (9), a steam pipe (10), and a mixed gas pipe (11). The Venturi ejector (9) is provided with an upper connecting section, a left connecting section (7), a right connecting section (8), and a lower connecting section. The lower connecting section of the Venturi ejector (9) is connected to the gas pipe (1) being tested. One end of the steam pipe (10) is connected to the left connecting section (7) of the Venturi ejector (9). The middle section of the steam pipe (10) is connected to the upper connecting section of the Venturi ejector (9). The right connecting section (8) of the Venturi ejector (9) is connected to the mixed gas pipe (11). Among them, the steam pipe (10) located between the upper connecting section and the left connecting section (7) is equipped with a first valve (12), the upper connecting section of the Venturi ejector (9) is equipped with a second valve (13), the lower connecting section is equipped with a third valve (14), and the mixed gas pipe (11) is equipped with a fourth valve (15). The inner diameter of the end of the steam pipe (10) connected to the left connecting section (7) is greater than the inner diameter of the left connecting section (7) of the Venturi ejector (9), and the inner diameter of the middle section of the steam pipe (10) connected to the upper connecting section is greater than the inner diameter of the upper connecting section of the Venturi ejector (9). The inner diameter of the gas mixing pipe (11) is larger than the inner diameter of the right connecting section (8) of the Venturi ejector (9).

2. The Venturi ejector purge device without dismantling as described in claim 1, characterized in that, The first valve (12), the second valve (13), the third valve (14), and the fourth valve (15) are all electric valves.

3. A method of using the Venturi ejector purge device without dismantling as described in claim 1 or 2, characterized in that, The steps include sampling mode, probe purging mode, and mixed gas outlet purging mode, as follows: Sampling mode: Open the first valve (12), the third valve (14) and the fourth valve (15), and keep the second valve (13) closed. At this time, the steam flows along the steam pipe (10) from the left connecting section (7) into the Venturi ejector (9) and flows out from the mixed gas pipe (11). The Venturi ejector (9) is connected to the gas pipe (1) under test. The gas in the gas pipe (1) under test flows into the Venturi ejector (9) through the sampling probe (4) and flows out with the steam for sampling. Probe purging mode: Open the second valve (13) and the third valve (14), keep the first valve (12) and the fourth valve (15) closed, the steam pipe (10) is connected to the gas pipe (1) under test, and the steam enters the sampling probe (4) through the Venturi ejector (9) for purging; Mixed gas outlet purging mode: Open the first valve (12) or the second valve (13), and open the fourth valve (15), while keeping the third valve (14) closed. Clean steam is blown out from the mixed gas pipeline (11) to purge the mixed gas outlet.

4. The method of use as described in claim 3, characterized in that, In the mixed gas outlet purging mode, the first valve (12) is opened and the second valve (13) is kept closed to purge the left connecting section (7) of the Venturi ejector (9); the second valve (13) is opened and the first valve (12) is kept closed to purge the upper connecting section of the Venturi ejector (9).

5. The method of use as described in claim 4, characterized in that, The first valve (12), the second valve (13), the third valve (14) and the fourth valve (15) are all electric valves. The sampling mode, the probe purging mode and the mixed gas outlet purging mode are automatically switched. The probe purging mode and the mixed gas outlet purging mode are performed sequentially.

6. The method of use as described in claim 5, characterized in that, The sampling probe (4), the mixed gas pipeline (11), and the Venturi ejector (9) were purged in sequence, as follows: First, open the second valve (13) and the third valve (14), keep the first valve (12) and the fourth valve (15) closed, purge the sampling probe (4), and at the same time purge the lower connecting section of the Venturi ejector (9); After a period of time, open the fourth valve (15), close the third valve (14), keep the second valve (13) open, keep the first valve (12) closed, purge the mixed gas pipeline (11), and at the same time purge the upper connecting section and the right connecting section (8) of the Venturi ejector (9); After a period of time, open the first valve (12), close the second valve (13), keep the fourth valve (15) open, keep the third valve (14) closed, purge the mixed gas pipeline (11), and at the same time purge the left connecting section (7) and right connecting section (8) of the Venturi ejector (9).

7. The method of use as described in claim 6, characterized in that, The time for purging the lower connecting section of the Venturi ejector (9) is greater than or equal to the time for purging the right connecting section (8) of the Venturi ejector (9), and the time for purging the left connecting section (7) of the Venturi ejector (9) is less than or equal to the time for purging the upper connecting section of the Venturi ejector (9).

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