CN203148508U - Pressure-leading device of transmitter for measuring liquid level in LNG production equipment - Google Patents

Pressure-leading device of transmitter for measuring liquid level in LNG production equipment Download PDF

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Publication number
CN203148508U
CN203148508U CN 201320110372 CN201320110372U CN203148508U CN 203148508 U CN203148508 U CN 203148508U CN 201320110372 CN201320110372 CN 201320110372 CN 201320110372 U CN201320110372 U CN 201320110372U CN 203148508 U CN203148508 U CN 203148508U
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China
Prior art keywords
transmitter
production equipment
lng production
pressure
pipeline
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CN 201320110372
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Chinese (zh)
Inventor
陈吉刚
李开烈
周发盛
王加壮
夏功科
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GUANG'AN CO Ltd OF CHINA NATURAL GAS CO Ltd
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GUANG'AN CO Ltd OF CHINA NATURAL GAS CO Ltd
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Priority to CN 201320110372 priority Critical patent/CN203148508U/en
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Abstract

The utility model relates to a pressure-leading device of a transmitter for measuring liquid level in LNG production equipment. The LNG production equipment comprises a container and a differential pressure transmitter, a positive pressure chamber and a negative pressure chamber of the differential pressure transmitter are connected with a positive pressure tap and a negative pressure tap of the container of the LNG production equipment through a positive pressure-leading tube and a negative pressure-leading tube respectively, a first ascent stage is arranged between the positive pressure tap of the container of the LNG production equipment and the positive pressure chamber of the differential pressure transmitter, a second ascent stage is arranged between the negative pressure tap of the container of the LNG production equipment and the negative pressure chamber of the differential pressure transmitter, and the horizontal position of the differential pressure transmitter is higher than the horizontal position of the negative pressure tap of the container of the LNG production equipment. By means of the differential pressure transmitter, the liquid level is displayed accurately, the problem of moving and change is solved, the working burden of operators who drain the liquid at regular times is relieved, and the risk of misoperation is decreased.

Description

The transmitter pressure-inducting device of LNG production equipment level gauging
Technical field
The utility model relates to the liquefied natural gas (LNG) production field, is specifically related to a kind of transmitter pressure-inducting device of LNG production equipment level gauging.
Background technology
LNG is the abbreviation of English liquefied natural gas (LNG) (liquefied natural gas).A lot of low-temperature separator and jar are arranged in the LNG production equipment, and the level gauging of the low-temperature separator in these LNG production equipments and jar all is to take differential pressure transmitter.These differential pressure transmitters both can transfer data to DCS and do control, and DCS is the english abbreviation of scattered control system (distributed control systems).These differential pressure transmitters can also transfer data to SIS and make interlocking, and SIS is the safety interlocking instrument system.Usually design is the below that differential pressure transmitter is installed in the positive pressure tappings of low-temperature separator or jar, in the LNG production equipment low-temperature separator or jar the positive and negative pressure chamber of positive and negative pressure tappings and differential pressure transmitter between positive and negative pressure guiding pipe by downward extension be connected, this mounting means makes differential pressure transmitter must have positive transfer, so must use manual operator that it is carried out positive transfer.
But be cryogenic media owing to what measure liquid again, cryogenic media is easy to gasification in the pressure pipe when normal temperature, handle even insulation has been done in the front, but effect still is not obvious.The downward extension of positive pressure guiding pipe can be because the gasification of cryogenic media cause downward extension liquid discontented, makes pressure reduction that differential pressure transmitter measures less than the pressure reduction of reality, thereby influence the accuracy of differential pressure transmitter liquid level demonstration.And the liquid medium that is mingled with in the gaseous medium in the negative pressure guiding pipe also may enter the negative pressure chamber of differential pressure transmitter along with gaseous medium, and it is inaccurate that liquid differential pressure transmitter liquid level is shown.At last, operating personnel must carry out regular discharge opeing to negative pressure guiding pipe, have increased operating personnel's work load and the risk of maloperation.
Summary of the invention
The purpose of this utility model is at the deficiencies in the prior art, a kind of transmitter pressure-inducting device of LNG production equipment level gauging is provided, the liquid level of the differential pressure transmitter of this device shows precisely, there is not migration change problem, and reduced operating personnel and gone to carry out the work load of regular discharge opeing and the risk of maloperation.
The purpose of this utility model is achieved in that a kind of transmitter pressure-inducting device of LNG production equipment level gauging, comprise container, differential pressure transmitter, described differential pressure transmitter just, negative pressure chamber is just passing through respectively, container just in negative pressure guiding pipe and the LNG production equipment, negative pressure tappings connects, be provided with for first ascent stage between the plemum of the positive pressure tappings of container and differential pressure transmitter in the described LNG production equipment, be provided with for second ascent stage between the negative pressure chamber of the negative pressure tappings of container and differential pressure transmitter in the described LNG production equipment, the horizontal level of described differential pressure transmitter is higher than the horizontal level of the negative pressure tappings of container in the LNG production equipment.
The upstream extremity of described first ascent stage is connected with the positive pressure tappings of container in the LNG production equipment by first pipeline, described first pipeline is provided with positive pressure measuring valve, the upstream extremity of described second ascent stage is connected with the negative pressure tappings of container in the LNG production equipment by second pipeline, described second pipeline is provided with negative pressure measuring valve, the downstream end of described first ascent stage is by the plemum of the 3rd pipeline connection differential pressure transmitter, and the downstream end of described second ascent stage connects the negative pressure chamber of differential pressure transmitter by the 4th pipeline.
Described second ascent stage is connected by a threeway with second pipeline, and first end of described threeway is connected with second pipeline, and second end of described threeway was connected with second ascent stage, and the 3rd end of described threeway connects a blowoff valve by the 5th pipeline.
Described differential pressure transmitter is provided with three valve groups, and first stop valve of described three valve groups is connected with the downstream end of first ascent stage, and second stop valve of described three valve groups is connected with the downstream end of second ascent stage.
Described blowoff valve is connected with the 5th pipeline socket weld.
The beneficial effects of the utility model are: owing to adopt above-mentioned embodiment, the horizontal level of described differential pressure transmitter is higher than the horizontal level of the negative pressure tappings of container in the LNG production equipment, and be provided with for first ascent stage between the plemum of the positive pressure tappings of container and differential pressure transmitter in the described LNG production equipment, make on high-tension side measurement liquid level be tank fill level true altitude H, the problem of change can not appear moving, so do not have the inaccurate problem of demonstration that causes differential pressure transmitter because of the cryogenic media gasification, and its measurement differential pressure just is liquid true altitude pressure.
Be provided with for second ascent stage between the negative pressure chamber of the negative pressure tappings of container and differential pressure transmitter in the described LNG production equipment again, liquid medium in the cryogenic media that the negative pressure tappings of container extracts from the LNG production equipment can be gasified fully in second ascent stage, make the cryogenic media in the negative pressure chamber that enters differential pressure transmitter be gaseous state entirely, and Qi Hua liquid medium can not flow back in the container or the blowoff valve place along first ascent stage yet, so both fully solve the lime set problem of low-pressure side, avoided artificially often going the process of discharge opeing.The problem of change also can not appear moving in low-pressure side, and therefore, having avoided differential pressure transmitter because of the problem of migration change influences the accuracy that differential pressure transmitter shows.
The utility model has reduced device because the differential pressure transmitter error signal causes the number of times that the device interlocking stops, from energy point of view, and obvious energy efficient.
The problem of change can not appear moving in the utility model, so need not move differential pressure transmitter.
Described blowoff valve is connected with the 5th pipeline socket weld, to solve leakage problem in the blowoff valve that occurs behind its former multiple switching.
Description of drawings
Fig. 1 is synoptic diagram of the present utility model.
In the accompanying drawing, 1 is container, and 2 is differential pressure transmitter, and 3 is three valve groups, 4 is first stop valve, and 5 is second stop valve, and 6 is positive pressure tappings, 7 negative pressure tappings, 8 was first ascent stage, and 9 was second ascent stage, and 10 is first pipeline, and 11 is positive pressure measuring valve, 12 is second pipeline, and 13 are negative pressure measuring valve, 14 the 3rd pipelines, 15 is the 4th pipeline, and 16 are threeway, and 17 is the 5th pipeline, 18 is blowoff valve, and 19 is first cutting ferrule, and 20 is second cutting ferrule.
Embodiment
Referring to Fig. 1, a kind of transmitter pressure-inducting device of LNG production equipment level gauging, comprise container 1, differential pressure transmitter 2, described differential pressure transmitter 2 just, negative pressure chamber is just passing through respectively, container just in negative pressure guiding pipe and the LNG production equipment, negative pressure tappings 6,7 connect, be provided with for first ascent stage 8 in the described LNG production equipment between the plemum of the positive pressure tappings 6 of container 1 and differential pressure transmitter 2, make on high-tension side measurement liquid level be tank fill level true altitude H, the problem of change can not appear moving, so do not have the inaccurate problem of demonstration that causes differential pressure transmitter because of the cryogenic media gasification, and its measurement differential pressure just is liquid true altitude pressure.Be provided with for second ascent stage 9 in the described LNG production equipment between the negative pressure chamber of the negative pressure tappings 7 of container 1 and differential pressure transmitter 2, liquid medium in the cryogenic media that the negative pressure tappings of container extracts from the LNG production equipment can be gasified fully in second ascent stage, make the cryogenic media in the negative pressure chamber that enters differential pressure transmitter be gaseous state entirely, and Qi Hua liquid medium can not flow back in the container or the blowoff valve place along first ascent stage yet, so both fully solve the lime set problem of low-pressure side, avoided artificially often going the process of discharge opeing.The problem of change also can not appear moving in low-pressure side, and therefore, having avoided differential pressure transmitter because of the problem of migration change influences the accuracy that differential pressure transmitter shows.The horizontal level of described differential pressure transmitter 2 is higher than the horizontal level of the negative pressure tappings 7 of container 1 in the LNG production equipment.The upstream extremity of described first ascent stage 8 of present embodiment is connected with the positive pressure tappings 6 of container 1 in the LNG production equipment by first pipeline 10, first pipeline of present embodiment adopts being rigidly connected of weldless steel tube with being connected of first ascent stage, and has done the loop processing.Can certainly do proper flexibility and connect processing.Described first pipeline 10 is provided with positive pressure measuring valve 11, and described positive pressure measuring valve 11 is connected by first cutting ferrule 19 with first pipeline 10.The upstream extremity of described second ascent stage 9 is connected with the negative pressure tappings 7 of container 1 in the LNG production equipment by second pipeline 12, and described second pipeline 12 is provided with negative pressure measuring valve 13, and described negative pressure measuring valve 13 is connected by second cutting ferrule 20 with second pipeline 12.Described second ascent stage 9 of present embodiment is connected by a threeway 16 with second pipeline 12, first end of described threeway 16 is connected with second pipeline 12, second end of described threeway 16 was connected with second ascent stage 9, and the 3rd end of described threeway 16 connects a blowoff valve 18 by the 5th pipeline 17.Described blowoff valve 18 is connected with the 5th pipeline 17 socket welds, to solve leakage problem in the blowoff valve that occurs behind its former multiple switching.The downstream end of described first ascent stage 8 is by the plemum of the 3rd pipeline 14 connection differential pressure transmitters 2, and the downstream end of described second ascent stage 9 connects the negative pressure chamber of differential pressure transmitters 2 by the 4th pipeline 15.The 3rd pipeline of present embodiment adopts being rigidly connected of weldless steel tube with being connected of first ascent stage, and has done the loop processing.Can certainly do proper flexibility and connect processing.The 4th pipeline of present embodiment adopts being rigidly connected of weldless steel tube with being connected of second ascent stage, and has done the loop processing.Can certainly do proper flexibility and connect processing.The described differential pressure transmitter 2 of present embodiment is provided with three valve groups 3, and first stop valve 4 of described three valve groups 3 is connected with the downstream end of first ascent stage 8, and second stop valve 5 of described three valve groups 3 is connected with the downstream end of second ascent stage 9.The effect of described three valve groups is first and second stop valve conducting or disconnections of the positive and negative pressure tappings of container in the positive and negative pressure chamber of differential pressure transmitter and the LNG production equipment being passed through three valve groups, or the positive and negative pressure chamber of differential pressure transmitter is passed through equalizing valve disconnection or the conducting of three valve groups.

Claims (5)

1. the transmitter pressure-inducting device of a LNG production equipment level gauging, comprise container, differential pressure transmitter, described differential pressure transmitter just, negative pressure chamber is just passing through respectively, container just in negative pressure guiding pipe and the LNG production equipment, negative pressure tappings connects, it is characterized in that: be provided with for first ascent stage between the plemum of the positive pressure tappings of container and differential pressure transmitter in the described LNG production equipment, be provided with for second ascent stage between the negative pressure chamber of the negative pressure tappings of container and differential pressure transmitter in the described LNG production equipment, the horizontal level of described differential pressure transmitter is higher than the horizontal level of the negative pressure tappings of container in the LNG production equipment.
2. the transmitter pressure-inducting device of LNG production equipment level gauging according to claim 1, it is characterized in that: the upstream extremity of described first ascent stage is connected with the positive pressure tappings of container in the LNG production equipment by first pipeline, described first pipeline is provided with positive pressure measuring valve, the upstream extremity of described second ascent stage is connected with the negative pressure tappings of container in the LNG production equipment by second pipeline, described second pipeline is provided with negative pressure measuring valve, the downstream end of described first ascent stage is by the plemum of the 3rd pipeline connection differential pressure transmitter, and the downstream end of described second ascent stage connects the negative pressure chamber of differential pressure transmitter by the 4th pipeline.
3. the transmitter pressure-inducting device of LNG production equipment level gauging according to claim 2, it is characterized in that: described second ascent stage is connected by a threeway with second pipeline, first end of described threeway is connected with second pipeline, second end of described threeway was connected with second ascent stage, and the 3rd end of described threeway connects a blowoff valve by the 5th pipeline.
4. the transmitter pressure-inducting device of LNG production equipment level gauging according to claim 1, it is characterized in that: described differential pressure transmitter is provided with three valve groups, first stop valve of described three valve groups is connected with the downstream end of first ascent stage, and second stop valve of described three valve groups is connected with the downstream end of second ascent stage.
5. the transmitter pressure-inducting device of LNG production equipment level gauging according to claim 3, it is characterized in that: described blowoff valve is connected with the 5th pipeline socket weld.
CN 201320110372 2013-03-12 2013-03-12 Pressure-leading device of transmitter for measuring liquid level in LNG production equipment Active CN203148508U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201320110372 CN203148508U (en) 2013-03-12 2013-03-12 Pressure-leading device of transmitter for measuring liquid level in LNG production equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201320110372 CN203148508U (en) 2013-03-12 2013-03-12 Pressure-leading device of transmitter for measuring liquid level in LNG production equipment

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CN203148508U true CN203148508U (en) 2013-08-21

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111366214A (en) * 2020-04-24 2020-07-03 河南神马尼龙化工有限责任公司 Device for measuring liquid level of catalyst suspension aqueous solution
CN111380589A (en) * 2020-03-28 2020-07-07 华中科技大学 Liquid level measuring device and liquid level measuring method for pressure difference type gas storage

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111380589A (en) * 2020-03-28 2020-07-07 华中科技大学 Liquid level measuring device and liquid level measuring method for pressure difference type gas storage
CN111366214A (en) * 2020-04-24 2020-07-03 河南神马尼龙化工有限责任公司 Device for measuring liquid level of catalyst suspension aqueous solution
CN111366214B (en) * 2020-04-24 2021-06-15 河南神马尼龙化工有限责任公司 Device for measuring liquid level of catalyst suspension aqueous solution

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