CN112179726A - Cracked gas sampling device and decoking method - Google Patents

Cracked gas sampling device and decoking method Download PDF

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Publication number
CN112179726A
CN112179726A CN201910586113.7A CN201910586113A CN112179726A CN 112179726 A CN112179726 A CN 112179726A CN 201910586113 A CN201910586113 A CN 201910586113A CN 112179726 A CN112179726 A CN 112179726A
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valve
shutoff valve
temperature
steam inlet
seconds
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彭守泉
席兵杰
崔建保
邢德立
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Kaloon Analytical Instruments Co ltd
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Kaloon Analytical Instruments Co ltd
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Priority to CN201910586113.7A priority Critical patent/CN112179726A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
    • B08B9/027—Cleaning the internal surfaces; Removal of blockages
    • B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
    • G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B2230/00—Other cleaning aspects applicable to all B08B range
    • B08B2230/01—Cleaning with steam

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  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Biochemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Molecular Biology (AREA)
  • General Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Mechanical Engineering (AREA)
  • Nonlinear Science (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

The application discloses pyrolysis gas sampling device and decoking method, pyrolysis gas sampling device include cooling heat transfer piece, process pipeline and technology shutoff valve, the last sample thief hatch that has seted up of process pipeline, the entry of cooling exchanger pass through the technology shutoff valve with the sample thief hatch links to each other, the export of cold and hot exchanger is equipped with steam inlet and sample export respectively, be equipped with the steam inlet valve on the steam inlet, be equipped with the control by temperature change shutoff valve on the sample export. In the initial state, the process shutoff valve and the temperature control shutoff valve are opened, and the steam inlet valve, the nitrogen inlet valve and the purging exhaust valve are closed; closing the temperature control shutoff valve, delaying for a period of time, opening the steam inlet valve and introducing steam, and delaying for a period of time; and closing the process shutoff valve, delaying for a period of time, and opening the process shutoff valve to enable the cleaned cokes to flow back to the process pipeline, so that the coke cleaning is comprehensive and the cost is low.

Description

Cracked gas sampling device and decoking method
Technical Field
The invention relates to the technical field of testing instruments, in particular to a cracked gas sampling device and a decoking method.
Background
In the cracking production process of the ethylene device in the petrochemical industry, in order to timely master, control and adjust the process operation parameters of the ethylene cracking furnace, cracking gas at the outlet of the ethylene cracking furnace needs to be sampled by a sampler for analysis by an online chromatograph or laboratory sampling analysis. Because the pyrolysis gas is a high-temperature, high-water-content and oil-containing mixed gas, the main functions and tasks of the sampler are to cool the pyrolysis gas and separate oil, gas and water.
Because the raw material composition, the reaction process and the product of the pyrolysis gas have particularity, substances such as tar, carbon granules, polymers and the like can be generated in a pipeline under the high-temperature condition, and the filter section is easily blocked by coke granules and sticky liquid. This can occur due to the untimely closing of the process sampling valve and the large amount of coke particles contained in the cracked gas. How to rapidly remove the filter segment blockage is very important. At present, a cylinder piston coke cleaner is generally adopted, and the cylinder piston coke cleaner reciprocates once every 3 to 5 minutes to clean coke. The existing ethylene cracking furnace cracking gas sampling device has the defects of complex coke cleaning device, large maintenance workload, incomplete coke cleaning and high cost.
Disclosure of Invention
In view of the above-mentioned drawbacks and deficiencies of the prior art, it is desirable to provide a cracked gas sampling device and a decoking method.
In order to overcome the defects of the prior art, the technical scheme provided by the invention is as follows:
in a first aspect, the invention provides a pyrolysis gas sampling device, which is characterized by comprising a cooling heat exchange piece, a process pipeline and a process shutoff valve, wherein a sample sampling port is formed in the process pipeline, an inlet of a cooling exchanger is connected with the sample sampling port through the process shutoff valve, an outlet of the cooling heat exchanger is respectively provided with a steam inlet and a sample outlet, the steam inlet is provided with a steam inlet valve, and the sample outlet is provided with a temperature control shutoff valve.
Furthermore, a nitrogen inlet is arranged between the sample outlet and the temperature control shutoff valve, a nitrogen inlet valve is arranged on the nitrogen inlet, a purging discharge port is arranged at the inlet of the cold-heat exchange element, and a purging discharge valve is arranged on the purging discharge port.
Furthermore, the cracked gas sampling device also comprises a controller, and the controller is respectively electrically connected with the steam inlet valve, the temperature control shutoff valve, the process shutoff valve, the purging exhaust valve and the nitrogen inlet valve.
Furthermore, a temperature controller is further arranged on the sample outlet and comprises a temperature control unit and a temperature measuring element, the temperature measuring element is electrically connected with the input end of the temperature control unit, and the output end of the temperature control unit is electrically connected with the temperature control shutoff valve.
Further, the temperature measuring element is a thermistor.
In a second aspect, the invention provides a decoking method, which is characterized by comprising,
step S10: the process shutoff valve and the temperature control shutoff valve are opened, and the steam inlet valve, the nitrogen inlet valve and the purging exhaust valve are closed;
the decoking method comprises the following steps of,
step S20: closing the temperature control shutoff valve, the purging exhaust valve and the nitrogen inlet valve, and opening the steam inlet valve and the process shutoff valve for 0-1200 seconds;
step S30: and (4) closing the process shutoff valve for 0-1200 seconds, and then opening the process shutoff valve.
Further, the decoking method further includes step S40: the step S30 is repeatedly performed several times, and then the steam inlet valve and the process shutoff valve are closed.
Further, the decoking method further includes step S50: opening a nitrogen inlet valve and a purging exhaust valve after delaying for 0-1200 seconds, and delaying for 0-1200 seconds; closing the inlet valve of the nitrogen gas, and delaying for 0-1200 seconds; the purge drain valve is closed.
Further, the decoking method further includes step S60: and opening the process shutoff valve after 0-1200 seconds of delay.
Further, the decoking method further includes step S70: and when the temperature measuring element reaches a set temperature value, opening the temperature control shutoff valve.
Compared with the prior art, the invention has the beneficial effects that:
the pyrolysis gas sampling device comprises a cooling heat exchange piece, a process pipeline and a process shutoff valve, wherein a sample sampling port is formed in the process pipeline, an inlet of the cooling exchanger is connected with the sample sampling port through the process shutoff valve, an outlet of the cold-heat exchanger is respectively provided with a steam inlet and a sample outlet, a steam inlet valve is arranged on the steam inlet, and a temperature control shutoff valve is arranged on the sample outlet. In the initial state, the process shutoff valve and the temperature control shutoff valve are opened, and the steam inlet valve, the nitrogen inlet valve and the purging exhaust valve are closed; closing the temperature control shutoff valve, delaying for a period of time, opening the steam inlet valve and introducing steam, and delaying for a period of time; and closing the process shutoff valve, delaying for a period of time, and opening the process shutoff valve to enable the cleaned cokes to flow back to the process pipeline, so that the coke cleaning is comprehensive and the cost is low.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a schematic structural diagram of a cracked gas sampling apparatus according to an embodiment of the present invention;
FIG. 2 is a block diagram of the connections between the various components of the temperature controller and the temperature-controlled shutoff valve provided in the embodiments of the present invention;
fig. 3 is a block flow diagram of a decoking method according to an embodiment of the present invention.
In the figure: 1-cooling heat exchange piece, 2-process pipeline, 3-sample sampling port, 4-steam inlet, 5-sample outlet, 6-nitrogen inlet, 7-purging discharge port, 8-process shutoff valve, 9-steam inlet valve, 10-temperature control shutoff valve, 11-nitrogen inlet valve, 12-purging discharge valve, 13-controller, 14-temperature controller, 141-temperature measuring element and 142-temperature control unit.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
As mentioned in the background art, due to the particularity of the raw material composition, the reaction process and the product of the pyrolysis gas, under the high temperature condition, tar, carbon particles, polymers and other substances are generated in the pipeline, and the filter section is easily blocked by the coke particles and sticky liquid. This can occur due to the untimely closing of the process sampling valve and the large amount of coke particles contained in the cracked gas. How to rapidly remove the filter segment blockage is very important. At present, a cylinder piston coke cleaner is generally adopted, and the cylinder piston coke cleaner reciprocates once every 3 to 5 minutes to clean coke. The existing ethylene cracking furnace cracking gas sampling device has the defects of complex coke cleaning device, large maintenance workload, incomplete coke cleaning and high cost.
Referring to fig. 1, the invention provides a pyrolysis gas sampling device, which comprises a cooling heat exchange part 11, a process pipeline 2 and a process shutoff valve 8, wherein a sample sampling port 3 is formed in the process pipeline 2, an inlet of the cooling heat exchanger is connected with the sample sampling port 3 through the process shutoff valve 8, an outlet of the cold heat exchanger is respectively provided with a steam inlet 4 and a sample outlet 5, the steam inlet 4 is provided with a steam inlet valve 9, and the sample outlet 5 is provided with a temperature control shutoff valve 10.
It should be noted that, here, the process pipeline 2 refers to a high-temperature gas channel of an ethylene cracking furnace, a steam inlet 4 on the cold-heat exchanger is used for connecting with an external device for introducing steam, and a sample outlet 5 on the cold-heat exchanger is used for connecting with an analyzer.
As an implementation manner, a nitrogen inlet 6 is arranged between the sample outlet 5 and the temperature-controlled shutoff valve 10, a nitrogen inlet valve 11 is arranged on the nitrogen inlet 6, a purging discharge port 7 is arranged at the inlet of the cold-heat exchange element, and a purging discharge valve 12 is arranged on the purging discharge port 7.
It should be noted that the nitrogen inlet 6 is used for connecting a nitrogen purge source, and introducing nitrogen, and the inlet of the cold heat exchange element is provided with a purge discharge valve 12 for discharging nitrogen.
As an implementation manner, the cracked gas sampling device further includes a controller 13, and the controller 13 is electrically connected to the steam inlet valve 9, the temperature-controlled shutoff valve 10, the process shutoff valve 8, the purge discharge valve 12, and the nitrogen inlet valve 11, respectively.
It should be noted that the steam inlet valve 9, the temperature-controlled shutoff valve 10, the process shutoff valve 8, the purge discharge valve 12, and the nitrogen inlet valve 11 are all solenoid valves, and the controller 13 is a PLC controller.
Referring to fig. 2, as an implementation manner, a temperature controller 14 is further disposed on the sample outlet 5, the temperature controller 14 includes a temperature control unit 142 and a temperature measuring element 141, the temperature measuring element 141 is electrically connected to an input end of the temperature control unit 142, and an output end of the temperature control unit 142 is electrically connected to the temperature-controlled shutoff valve 10. Preferably, the temperature measuring element 141 is a thermistor.
It should be noted that the temperature measuring element 141 can monitor the temperature of the sample outlet 5, and when the temperature of the sample outlet 5 measured by the temperature measuring element 141 exceeds the set temperature, the temperature-controlled shutoff valve 10 shuts off the sample outlet 5.
Referring to fig. 3, the present invention also provides a decoking method, comprising,
step S10: the process shutoff valve 8 and the temperature-controlled shutoff valve 10 are opened, and the steam inlet valve 9, the nitrogen inlet valve 11 and the purging exhaust valve 12 are closed;
step S20: closing the temperature control shutoff valve 10, delaying for 0-1200 seconds, and opening the steam inlet valve 9, delaying for 0-1200 seconds;
step S30: the process shutoff valve 8 is closed for 0-1200 seconds and then the process shutoff valve 8 is opened.
In the initial state, the process shutoff valve 8 and the temperature control shutoff valve 10 are opened, the steam inlet valve 9, the nitrogen inlet valve 11 and the purging exhaust valve 12 are closed, at the moment, high-temperature gas rises from the process pipeline 2 and enters the cooling heat exchanger, and after surface heat exchange, a medium with a high condensation point in the high-temperature gas is condensed and flows back to the process pipeline 2. The high-temperature gas contains oil-gas mixture with high condensation point and easy coking, and the oil-gas mixture changes into solid phase or viscous liquid phase substance after the temperature is reduced and is adhered to the sampling tube.
During coke cleaning, the nitrogen inlet valve 11 and the purging exhaust valve 12 are continuously kept closed, and the process shutoff valve 8 is opened; then closing the temperature control shutoff valve 10 for a period of time, opening the steam inlet valve 9, allowing the steam to enter the cooling heat exchange piece 1, closing the process shutoff valve 8 after a period of time delay according to the actual action speed, preventing the steam from entering the process pipeline 2, and performing coke cleaning by using a steam explosion method. And opening the process shutoff valve 8 after a period of time according to the actual action speed, and connecting steam to the port of the process pipeline 2 to enable the cleaned coked material to flow back.
As an implementable manner, the decoking method further includes step S40: the step S30 is repeatedly performed several times, and then the steam inlet valve 9 and the process shutoff valve 8 are closed. And coke is cleared through multiple times of steam explosion until no coke is contained in the sampling device.
As an implementable manner, the decoking method further includes step S50: opening the nitrogen inlet valve 11 and the purging exhaust valve 12 after delaying for 0-1200 seconds, and delaying for 0-1200 seconds; closing the nitrogen inlet valve 11, and delaying for 0-1200 seconds; purge drain valve 12 is closed.
And (3) connecting a nitrogen purging channel, delaying for a period of time according to the actual action, closing the nitrogen inlet valve 11, cutting off the nitrogen purging gas source, delaying for a period of time according to the actual action, closing the nitrogen purging discharge outlet after water is completely discharged, and completing the water removal action process.
As an implementable manner, the decoking method further includes step S60: the process shutoff valve 8 is opened after a delay of 0-1200 seconds. The process pipe 2 is connected to the cooling heat exchange element 1, and the temperature of the cooling heat exchange element 1 is recovered
As an implementable manner, the decoking method further includes step S70: when the temperature measuring element 141 reaches the set temperature value, the temperature-controlled shut-off valve 10 is opened. At this time, the thermo-valve 10 is not controlled by the controller 13 any more, but is controlled by the temperature measuring element 141.
The method is described in further detail below with reference to specific examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention.
Example 1
Step S10: the process shutoff valve 8 and the temperature-controlled shutoff valve 10 are opened, and the steam inlet valve 9, the nitrogen inlet valve 11 and the purging exhaust valve 12 are closed;
step S20: closing the temperature control shutoff valve 10, delaying for 20 seconds, opening the steam inlet valve 9, and delaying for 60 seconds;
step S30: closing the process shutoff valve 8, delaying for 10 seconds, and then opening the process shutoff valve 8;
step S40: repeating the step S30 ten times, and then closing the steam inlet valve 9 and the process shutoff valve 8;
s50: after delaying for 20 seconds, opening the nitrogen inlet valve 11 and the purging exhaust valve 12, and delaying for 60 seconds; closing the nitrogen inlet valve 11, and delaying for 10 seconds; closing the purge drain valve 12;
step S60: opening the process shutoff valve 8 after delaying for 20 seconds;
step S70: when the temperature measuring element 141 reaches the set temperature value, the temperature-controlled shut-off valve 10 is opened.
Example 2
Step S10: the process shutoff valve 8 and the temperature-controlled shutoff valve 10 are opened, and the steam inlet valve 9, the nitrogen inlet valve 11 and the purging exhaust valve 12 are closed;
step S20: closing the temperature control shutoff valve 10, delaying for 600 seconds, and opening the steam inlet valve 9, delaying for 500 seconds;
step S30: the process shutdown valve 8 is closed for a 300 second delay and then the process shutdown valve 8 is opened.
Step S40: step S30 is repeated four times, and then the vapor inlet valve 9 and the process shutoff valve 8 are closed.
S50: after the time delay of 600 seconds, opening the nitrogen inlet valve 11 and the purging exhaust valve 12, and delaying for 500 seconds; closing the nitrogen inlet valve 11, and delaying for 300 seconds; purge drain valve 12 is closed.
Step S60: after a delay of 600 seconds the process shut-off valve 8 is opened.
Step S70: when the temperature measuring element 141 reaches the set temperature value, the temperature-controlled shut-off valve 10 is opened.
Example 3
Step S10: the process shutoff valve 8 and the temperature-controlled shutoff valve 10 are opened, and the steam inlet valve 9, the nitrogen inlet valve 11 and the purging exhaust valve 12 are closed;
step S20: closing the temperature control shutoff valve 10, delaying for 1200 seconds, opening the steam inlet valve 9, and delaying for 800 seconds;
step S30: closing the process shutdown valve 8 is delayed for 600 seconds and then opening the process shutdown valve 8.
Step S40: step S30 is repeatedly performed twice, and then the steam inlet valve 9 and the process shutoff valve 8 are closed.
S50: opening the nitrogen inlet valve 11 and the purge discharge valve 12 after delaying 1200 seconds, and delaying 800 seconds; closing the nitrogen inlet valve 11, and delaying for 600 seconds; purge drain valve 12 is closed.
Step S60: after a delay of 1200 seconds the process shut-off valve 8 is opened.
Step S70: when the temperature measuring element 141 reaches the set temperature value, the temperature-controlled shut-off valve 10 is opened.
Example 4
Step S10: the process shutoff valve 8 and the temperature-controlled shutoff valve 10 are opened, and the steam inlet valve 9, the nitrogen inlet valve 11 and the purging exhaust valve 12 are closed;
step S20: closing the temperature control shutoff valve 10, delaying for 1000 seconds, opening the steam inlet valve 9, and delaying for 1200 seconds;
step S30: the process shutdown valve 8 is closed for a time delay of 1200 seconds and then the process shutdown valve 8 is opened.
Step S40: step S30 is repeated once, and then the vapor inlet valve 9 and the process shutoff valve 8 are closed.
S50: after delaying 1000 seconds, opening the nitrogen inlet valve 11 and the purge discharge valve 12, and delaying 1200 seconds; closing the nitrogen inlet valve 11, and delaying for 1200 seconds; purge drain valve 12 is closed.
Step S60: after a delay of 1200 seconds the process shut-off valve 8 is opened.
Step S70: when the temperature measuring element 141 reaches the set temperature value, the temperature-controlled shut-off valve 10 is opened.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims (10)

1. A cracked gas sampling device is characterized by comprising a cooling heat exchange piece, a process pipeline and a process shutoff valve, wherein a sample sampling port is formed in the process pipeline, an inlet of a cooling exchanger is connected with the sample sampling port through the process shutoff valve, an outlet of a cold-heat exchanger is respectively provided with a steam inlet and a sample outlet, a steam inlet valve is arranged on the steam inlet, and a temperature control shutoff valve is arranged on the sample outlet.
2. The cracked gas sampling device of claim 1, wherein a nitrogen inlet is provided between the sample outlet and the temperature-controlled shutoff valve, a nitrogen inlet valve is provided on the nitrogen inlet, a purge discharge port is provided at the inlet of the cold heat exchange element, and a purge discharge valve is provided on the purge discharge port.
3. The cracked gas sampling device of claim 2, further comprising a controller electrically connected to the vapor inlet valve, the temperature-controlled shutoff valve, the process shutoff valve, the purge vent valve, and the nitrogen inlet valve, respectively.
4. The cracked gas sampling device of any one of claims 1 to 3, wherein a temperature controller is further provided on the sample outlet, the temperature controller includes a temperature control unit and a temperature measuring element, the temperature measuring element is electrically connected with an input end of the temperature control unit, and an output end of the temperature control unit is electrically connected with a temperature control shutoff valve.
5. The cracked gas sampling device of claim 4, wherein the temperature sensing element is a thermistor.
6. A decoking method is characterized by comprising the following steps,
step S10: the process shutoff valve and the temperature control shutoff valve are opened, and the steam inlet valve, the nitrogen inlet valve and the purging exhaust valve are closed;
step S20: closing the temperature control shutoff valve, the purging exhaust valve and the nitrogen inlet valve, and opening the steam inlet valve and the process shutoff valve for 0-1200 seconds;
step S30: and (4) closing the process shutoff valve for 0-1200 seconds, and then opening the process shutoff valve.
7. The decoking method according to claim 6, further comprising step S40: the step S30 is repeatedly performed several times, and then the steam inlet valve and the process shutoff valve are closed.
8. The decoking method according to claim 7, further comprising step S50: opening a nitrogen inlet valve and a purging exhaust valve after delaying for 0-1200 seconds, and delaying for 0-1200 seconds; closing the inlet valve of the nitrogen gas, and delaying for 0-1200 seconds; the purge drain valve is closed.
9. The decoking method according to claim 8, further comprising step S60: and opening the process shutoff valve after 0-1200 seconds of delay.
10. The decoking method according to claim 9, further comprising step S70: and when the temperature measuring element reaches a set temperature value, opening the temperature control shutoff valve.
CN201910586113.7A 2019-07-01 2019-07-01 Cracked gas sampling device and decoking method Pending CN112179726A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910586113.7A CN112179726A (en) 2019-07-01 2019-07-01 Cracked gas sampling device and decoking method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910586113.7A CN112179726A (en) 2019-07-01 2019-07-01 Cracked gas sampling device and decoking method

Publications (1)

Publication Number Publication Date
CN112179726A true CN112179726A (en) 2021-01-05

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910586113.7A Pending CN112179726A (en) 2019-07-01 2019-07-01 Cracked gas sampling device and decoking method

Country Status (1)

Country Link
CN (1) CN112179726A (en)

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