CN203148509U - Negative pressure chamber voltage stabilizer of differential pressure transmitter of LNG production equipment - Google Patents

Negative pressure chamber voltage stabilizer of differential pressure transmitter of LNG production equipment Download PDF

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Publication number
CN203148509U
CN203148509U CN 201320110373 CN201320110373U CN203148509U CN 203148509 U CN203148509 U CN 203148509U CN 201320110373 CN201320110373 CN 201320110373 CN 201320110373 U CN201320110373 U CN 201320110373U CN 203148509 U CN203148509 U CN 203148509U
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China
Prior art keywords
negative pressure
production equipment
lng production
differential pressure
separation vessel
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CN 201320110373
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Chinese (zh)
Inventor
李均方
陈吉刚
王加壮
夏功科
周发盛
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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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Abstract

The utility model discloses a negative pressure chamber voltage stabilizer of a differential pressure transmitter of LNG production equipment. The LNG production equipment comprises the differential pressure transmitter. The differential pressure transmitter is connected with a separator or a container tower of the LNG production equipment through a pressure-leading tube, a positive pressure chamber of the differential pressure transmitter is connected with a positive pressure tap of the separator or the container tower of the LNG production equipment through a positive pressure-leading tube, a negative pressure chamber of the differential pressure transmitter is connected with a negative pressure tap of the separator or the container tower of the LNG production equipment through a negative pressure-leading tube, and the horizontal position of the differential pressure transmitter is lower than the positive pressure tap of the separator or the container tower. An isolation tank is arranged on the negative pressure-leading tube, an inlet in the side wall of the isolation tank is as high as the negative pressure tap of the separator or the container tower, the inlet in the side wall of the isolation tank is connected with the negative pressure tap of the separator or the container tower through a first negative pressure-leading tube, and an outlet in the bottom of the isolation tank is connected with the negative pressure chamber of the differential pressure transmitter through a second negative pressure-leading tube. By means of the negative pressure chamber voltage stabilizer of the differential pressure transmitter of the LNG production equipment, the differential pressure transmitter can display the liquid lever of the separator or the container tower accurately all the time.

Description

Negative pressure chamber's stable-pressure device of differential pressure transmitter in the LNG production equipment
Technical field
The utility model relates to the liquefied natural gas (LNG) production field, is specifically related to negative pressure chamber's stable-pressure device of differential pressure transmitter in a kind of LNG production equipment.
Background technology
LNG is the abbreviation of English liquefied natural gas (LNG) (liquefied natural gas).A lot of separation vessels or container tower are arranged in the LNG production equipment, and the level gauging of the separation vessel in these LNG production equipments and container tower 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 that positive pressure tappings with differential pressure transmitter and separation vessel or container tower is installed in same level height, making the plemum import of differential pressure transmitter and the minimum liquid level of separation vessel or the setting of container tower is same horizontal line, the plemum of differential pressure transmitter is by the positive pressure tappings of positive pressure guiding pipe connection separation vessel or container tower, and the minimum liquid level that positive pressure tappings and separation vessel or container tower are set is positioned at same horizontal line.The negative pressure chamber of differential pressure transmitter is by the negative pressure tappings of negative pressure guiding pipe connection separation vessel or container tower, and negative pressure tappings is higher than the highest liquid level of separation vessel or the setting of container tower.When the liquid level in separation vessel or the container tower was lower than the position of negative pressure tappings of separation vessel or container tower, differential pressure transmitter just can the correct measurement separation vessel or the liquid level of container tower.When the liquid level in separation vessel or the container tower exceeds the negative pressure tappings of separation vessel or container tower, liquid will flow into negative pressure guiding pipe, cause the liquid level demonstration of separation vessel or container tower inaccurate, gently then can cause causing the valve misoperation, may cause whole device interlocking to stop when serious.If when being high-temp liquid in separation vessel or the container tower, the condensation in negative pressure guiding pipe of the High Temperature Gas cognition of liquid level upper end forms liquid in separation vessel or the container tower, and it is inaccurate also can to cause liquid level to show.And the condensed fluid in the negative pressure guiding pipe also needs personnel regularly to discharge to the scene, has not only increased labor intensity of operating personnel, and at the scene also may be owing to maloperation causes security risk in the discharging work.Especially in the lower place of temperature, this type of situation of easier generation.There had been repeatedly the generation of this type of situation the Erdos.
Summary of the invention
The purpose of this utility model is at the deficiencies in the prior art, negative pressure chamber's stable-pressure device of differential pressure transmitter in a kind of LNG production equipment is provided, the negative pressure guiding pipe of this device between the negative pressure tappings of the negative pressure chamber of differential pressure transmitter and separation vessel or container tower increases sealing chamber, make the negative pressure chamber of differential pressure transmitter that liquid be arranged all the time by in sealing chamber, irritating liquid, the liquid-column height of negative pressure chamber that has guaranteed differential pressure transmitter is constant, thereby guarantees that differential pressure transmitter can accurately show the liquid level of separation vessel or container tower always.
The purpose of this utility model is achieved in that negative pressure chamber's stable-pressure device of differential pressure transmitter in a kind of LNG production equipment, comprise differential pressure transmitter, described differential pressure transmitter is connected with separation vessel or container tower in the LNG production equipment by pressure guiding pipe, the plemum of differential pressure transmitter is by the separation vessel in the positive pressure guiding pipe connection LNG production equipment or the positive pressure tappings of container tower, the negative pressure chamber of differential pressure transmitter is by the separation vessel in the negative pressure guiding pipe connection LNG production equipment or the negative pressure tappings of container tower, the horizontal level of described differential pressure transmitter is lower than separation vessel in the LNG production equipment or the positive pressure tappings of container tower, on the negative pressure guiding pipe sealing chamber is set, the negative pressure tappings of the import of described sealing chamber sidewall and separation vessel or container tower is positioned at same level height, the import of sealing chamber sidewall is connected by the separation vessel in the first negative pressure guiding pipe and the LNG production equipment or the negative pressure tappings of container tower, and the sealing chamber outlet at bottom passes through the second negative pressure guiding pipe and is connected with the negative pressure chamber of differential pressure transmitter.
The horizontal level of the separation vessel in the described LNG production equipment or the positive pressure tappings of container tower is lower than the minimum level that separation vessel or container tower are set, the high liquid level (HLL) that the horizontal level of the separation vessel in the described LNG production equipment or the negative pressure tappings of container tower is higher than that separation vessel or container tower set.
Described positive pressure guiding pipe is provided with positive pressure measuring valve, separation vessel in the upstream extremity connection LNG production equipment of described positive pressure measuring valve or the positive pressure tappings of container tower, the downstream end of described positive pressure measuring valve connects the negative pressure chamber of differential pressure transmitter, the described first negative pressure guiding pipe is provided with negative pressure measuring valve, separation vessel in the upstream extremity connection LNG production equipment of described negative pressure measuring valve or the negative pressure tappings of container tower, the downstream end of described negative pressure measuring valve connects the import of sealing chamber sidewall.
The beneficial effects of the utility model are: because the negative pressure guiding pipe of the utility model between the negative pressure tappings of the negative pressure chamber of differential pressure transmitter and separation vessel or container tower arranges a sealing chamber, make the negative pressure chamber of differential pressure transmitter that liquid be arranged all the time by irritating liquid to sealing chamber, so long as not the people for misprinting its spacer pad, the liquid-column height of negative pressure chamber that just can guarantee differential pressure transmitter is constant, thereby guarantees that differential pressure transmitter can accurately show the liquid level of separation vessel or container tower always.Because after on the negative pressure guiding pipe sealing chamber being set, the negative pressure chamber of differential pressure transmitter has liquid all the time, even the liquid level in separation vessel or the container tower exceeds the negative pressure tappings of separation vessel or container tower, cause liquid to flow into pressure guiding pipe, or high-temperature gas condensation in pressure guiding pipe forms liquid, also can not influence the pressure of differential pressure transmitter negative pressure chamber.Therefore avoid the artificial often process of discharge opeing, alleviated operating personnel's work load.Avoided operating personnel because carrying out the risk of regular discharge opeing initiation maloperation simultaneously.The pressure stability of differential pressure transmitter negative pressure chamber can guarantee that differential pressure transmitter normally shows accurate liquid level always, reduce because the error signal of differential pressure transmitter causes the number of times that the device interlocking stops, from energy point of view, it can reduce the emptying loss of parking, obviously energy efficient.The more important thing is the security risk that reduces during the start-stop car.The horizontal level of described differential pressure transmitter is lower than separation vessel in the LNG production equipment or the positive pressure tappings of container tower, makes things convenient for the I﹠M of equipment.
Description of drawings
Fig. 1 is synoptic diagram of the present utility model.
In the accompanying drawing, 1 is differential pressure transmitter, and 2 is the container tower, and 3 is plemum, and 4 is negative pressure chamber, and 5 is positive pressure guiding pipe, and 6 is the first negative pressure guiding pipe, and 7 is the second negative pressure guiding pipe, and 8 is sealing chamber, and 9 is positive pressure measuring valve, and 10 are negative pressure measuring valve, and 11 is positive pressure tappings, and 12 are negative pressure tappings.
Embodiment
Present embodiment is that example describes with the liquid level of measuring vessel tower.
Embodiment one
Referring to Fig. 1, negative pressure chamber's stable-pressure device of differential pressure transmitter in a kind of LNG production equipment, comprise differential pressure transmitter 1, described differential pressure transmitter 1 is connected with container tower 2 in the LNG production equipment by pressure guiding pipe, the plemum 3 of differential pressure transmitter 1 is by the positive pressure tappings 11 of the container tower 2 in the positive pressure guiding pipe 5 connection LNG production equipments, and the negative pressure chamber 4 of differential pressure transmitter 1 connects the negative pressure tappings 12 of the container tower 2 in the LNG production equipment by negative pressure guiding pipe.The horizontal level of described differential pressure transmitter 1 is lower than the positive pressure tappings 11 of the container tower 2 in the LNG production equipment, makes things convenient for the I﹠M of equipment.One sealing chamber 8 is set on the described negative pressure guiding pipe, the negative pressure tappings of described sealing chamber 8 sidewall imports and container tower 2 is positioned at same level height, sealing chamber 8 sidewall imports are connected by the negative pressure tappings 12 of the container tower 2 in the first negative pressure guiding pipe 6 and the LNG production equipment, sealing chamber 8 outlet at bottoms are connected with the negative pressure chamber 4 of differential pressure transmitter 1 by the second negative pressure guiding pipe 7, make differential pressure transmitter negative pressure chamber that liquid be arranged all the time by irritating liquid to sealing chamber, even the liquid level in the container tower exceeds the negative pressure tappings of container tower, cause liquid to flow into pressure guiding pipe, or high-temperature gas condensation in pressure guiding pipe forms liquid, so long as not the people for misprinting its spacer pad, negative pressure chamber's pressure of differential pressure transmitter remains constant, thereby differential pressure transmitter just can accurately show the liquid level in the container tower always.Described positive pressure guiding pipe 5 is provided with positive pressure measuring valve 9, the upstream extremity of described positive pressure measuring valve 9 connects the positive pressure tappings 11 of the container tower 2 in the LNG production equipment, the downstream end of described positive pressure measuring valve 9 connects the negative pressure chamber 4 of differential pressure transmitter 1, the described first negative pressure guiding pipe 6 is provided with negative pressure measuring valve 10, the upstream extremity of described negative pressure measuring valve 10 connects the negative pressure tappings 12 of the container tower 2 in the LNG production equipment, and the downstream end of described negative pressure measuring valve 10 connects sealing chamber 8 sidewall imports.
The horizontal level of the positive pressure tappings of the container tower in the described LNG production equipment is lower than the minimum level that the container tower is set, the high liquid level (HLL) that the horizontal level of the negative pressure tappings of the container tower in the described LNG production equipment is higher than that the container tower sets.Differ h1 between the minimum level that the horizontal level of the positive pressure tappings of the container tower in the described LNG production equipment and container tower are set, differ h2 between the positive pressure tappings of the container tower in the horizontal level of described differential pressure transmitter and the LNG production equipment, described liquid level is H, and the liquid-column height of the negative pressure chamber of described differential pressure transmitter is h3.The density of described measured medium is ρ 1, and described density isolating liquid is ρ 2, and at this moment the relational expression between liquid level H and the pressure reduction △ P is:
ΔP=(H+h1+h2)ρ1g-ρ2gh3=ρ1Hg-(ρ2h3-ρ1h1-ρ1h2)g。
By following formula as can be known, when H=0, Δ P=-(ρ 2h3-ρ 1h1-ρ 1h2)<0 namely has the additional constant item to act on differential pressure transmitter, makes the signal output part output current of differential pressure transmitter less than 4mA; When H=Hmax, maximum differential pressure Δ Pmax=ρ 1gHmax-(ρ 2h3-ρ 1h1-ρ 1h2) g, this maximum differential pressure makes the signal output part output current of differential pressure transmitter less than 20mA, the output of differential pressure transmitter and the proportionate relationship between the tested liquid level have been destroyed, therefore, adjust the migration parts of differential pressure transmitter under the situation that need allow at the range of differential pressure transmitter, make transmitter when H=0, Δ P=-(ρ 2h3-ρ 1h1-ρ 1h2), its output current is 4mA; When H=Hmax, Δ Pmax=ρ 1gHmax-(ρ 2h3-ρ 1h1-ρ 1h2) g, transmitter is output as 20mA.Because zero shift amount Δ P=-(ρ 2h3-ρ 1h1-ρ 1h2)<0 is so be referred to as negative transfer.By negative transfer, realized the normal corresponding relation between differential pressure transmitter output current and the tested liquid level, and the range of differential pressure transmitter still is 4~20mA.
The utility model realizes that the negative transfer method at zero point of differential pressure transmitter is: by the HART475 manual operator liquid level pressure of its increase is carried out negative transfer after calculating, its effect is that the measurement of transmitter is moved to a certain negative value from starting point, change the upper lower limit value of measurement range simultaneously, realize the translation of measurement range, but do not change the size of its range.Can show normally always after the negative transfer that accurate liquid level, negative transfer amount are Z=ρ 2h3g-ρ 1h1g-ρ 1h2g.
The utility model not only is confined to above-described embodiment, and it also is applicable to the liquid level of measuring separation vessel.
Embodiment two
Negative pressure chamber's stable-pressure device of differential pressure transmitter in a kind of LNG production equipment, comprise differential pressure transmitter, described differential pressure transmitter is connected with separation vessel in the LNG production equipment by pressure guiding pipe, the plemum of differential pressure transmitter connects the positive pressure tappings of the separation vessel in the LNG production equipment by positive pressure guiding pipe, the negative pressure chamber of differential pressure transmitter connects the negative pressure tappings of the separation vessel in the LNG production equipment by negative pressure guiding pipe, the horizontal level of described differential pressure transmitter is lower than the positive pressure tappings of the separation vessel in the LNG production equipment, on the negative pressure guiding pipe sealing chamber is set, the negative pressure tappings of the import of described sealing chamber sidewall and separation vessel is positioned at same level height, the import of sealing chamber sidewall is connected by the negative pressure tappings of the separation vessel in the first negative pressure guiding pipe and the LNG production equipment, and the sealing chamber outlet at bottom passes through the second negative pressure guiding pipe and is connected with the negative pressure chamber of differential pressure transmitter.
The horizontal level of the separation vessel in the described LNG production equipment or the positive pressure tappings of container tower is lower than the minimum level that separation vessel or container tower are set, the high liquid level (HLL) that the horizontal level of the separation vessel in the described LNG production equipment or the negative pressure tappings of container tower is higher than that separation vessel or container tower set.
Described positive pressure guiding pipe is provided with positive pressure measuring valve, separation vessel in the upstream extremity connection LNG production equipment of described positive pressure measuring valve or the positive pressure tappings of container tower, the downstream end of described positive pressure measuring valve connects the negative pressure chamber of differential pressure transmitter, the described first negative pressure guiding pipe is provided with negative pressure measuring valve, separation vessel in the upstream extremity connection LNG production equipment of described negative pressure measuring valve or the negative pressure tappings of container tower, the downstream end of described negative pressure measuring valve connects the import of sealing chamber sidewall.
The principle of present embodiment and zero point the negative transfer method the same.

Claims (3)

1. negative pressure chamber's stable-pressure device of differential pressure transmitter in the LNG production equipment, comprise differential pressure transmitter, described differential pressure transmitter is connected with separation vessel or container tower in the LNG production equipment by pressure guiding pipe, the plemum of differential pressure transmitter is by the separation vessel in the positive pressure guiding pipe connection LNG production equipment or the positive pressure tappings of container tower, the negative pressure chamber of differential pressure transmitter is by the separation vessel in the negative pressure guiding pipe connection LNG production equipment or the negative pressure tappings of container tower, it is characterized in that: the horizontal level of described differential pressure transmitter is lower than separation vessel in the LNG production equipment or the positive pressure tappings of container tower, on the negative pressure guiding pipe sealing chamber is set, the negative pressure tappings of the import of described sealing chamber sidewall and separation vessel or container tower is positioned at same level height, the import of sealing chamber sidewall is connected by the separation vessel in the first negative pressure guiding pipe and the LNG production equipment or the negative pressure tappings of container tower, and the sealing chamber outlet at bottom passes through the second negative pressure guiding pipe and is connected with the negative pressure chamber of differential pressure transmitter.
2. negative pressure chamber's stable-pressure device of differential pressure transmitter in the LNG production equipment according to claim 1, it is characterized in that: the horizontal level of the separation vessel in the described LNG production equipment or the positive pressure tappings of container tower is lower than the minimum level that separation vessel or container tower are set, the high liquid level (HLL) that the horizontal level of the separation vessel in the described LNG production equipment or the negative pressure tappings of container tower is higher than that separation vessel or container tower set.
3. negative pressure chamber's stable-pressure device of differential pressure transmitter in the LNG production equipment according to claim 1, it is characterized in that: described positive pressure guiding pipe is provided with positive pressure measuring valve, separation vessel in the upstream extremity connection LNG production equipment of described positive pressure measuring valve or the positive pressure tappings of container tower, the downstream end of described positive pressure measuring valve connects the negative pressure chamber of differential pressure transmitter, the described first negative pressure guiding pipe is provided with negative pressure measuring valve, separation vessel in the upstream extremity connection LNG production equipment of described negative pressure measuring valve or the negative pressure tappings of container tower, the downstream end of described negative pressure measuring valve connects the import of sealing chamber sidewall.
CN 201320110373 2013-03-12 2013-03-12 Negative pressure chamber voltage stabilizer of differential pressure transmitter of LNG production equipment Active CN203148509U (en)

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CN 201320110373 CN203148509U (en) 2013-03-12 2013-03-12 Negative pressure chamber voltage stabilizer of differential pressure transmitter of LNG production equipment

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105043498A (en) * 2015-04-30 2015-11-11 中石化宁波工程有限公司 Differential pressure liquid level measuring device
CN106643969A (en) * 2016-12-10 2017-05-10 大连福佳·大化石油化工有限公司 Open heating pot liquid level measuring system and method
CN113155349A (en) * 2021-04-26 2021-07-23 中国石油天然气股份有限公司 Regeneration tower differential pressure measuring device and regeneration tower differential pressure measuring system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105043498A (en) * 2015-04-30 2015-11-11 中石化宁波工程有限公司 Differential pressure liquid level measuring device
CN106643969A (en) * 2016-12-10 2017-05-10 大连福佳·大化石油化工有限公司 Open heating pot liquid level measuring system and method
CN113155349A (en) * 2021-04-26 2021-07-23 中国石油天然气股份有限公司 Regeneration tower differential pressure measuring device and regeneration tower differential pressure measuring system

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