CN1055948C - Reclaiming and reliquefying method and its equipment for liquefied gas venting to atmosphere - Google Patents
Reclaiming and reliquefying method and its equipment for liquefied gas venting to atmosphere Download PDFInfo
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- CN1055948C CN1055948C CN95113320A CN95113320A CN1055948C CN 1055948 C CN1055948 C CN 1055948C CN 95113320 A CN95113320 A CN 95113320A CN 95113320 A CN95113320 A CN 95113320A CN 1055948 C CN1055948 C CN 1055948C
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- pipe
- liquefied gas
- emptying
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Abstract
The present invention relates to a method and a device thereof used for recovering and reliquefying liquid gas which is vented to atmosphere, which belongs to the method and the device of physical aspect change. The technological process of liquid gas recovery comprises: direct suction recovery, compression, cooling and separation; the parameter control range comprises: the inlet pressure is from 0.01 to 0.1MPa, the inlet temperature is from 5 DEG C below zero to 40 DEG C, the outlet pressure is from 1.1 to 1.3MPa, and the outlet temperature is lower than 80 DEG C. The recovery device of the present invention is composed of a surge tank, a compressor, a cooler, and a separating tank and a control device thereof. The recovery quantity of the present invention is 900m<3>/h, the operating time is more than 8000 hours per year, enormous economical benefits can be obtained, and the pollution of atmospheric environment caused by venting the liquid gas to atmosphere can be solved.
Description
The present invention is that method of re-liquefaction and device thereof are reclaimed in a kind of liquefied gas emptying, belongs to the method and apparatus of general physical aspects change.
Now be stored in the liquefied gas of tank field, in storage, conveying and cargo handling process, hydrocarbon gas emptying is all arranged, be disposed in the atmosphere through the emptying tower, and this measure meeting causes atmospheric pollution, when air pressure is low, calm, hydrocarbon gas can deposit on the ground, if run into naked light, also can set off an explosion, this is breakneck hidden danger.
At present, to being disposed to atmospheric hydrocarbon gas, taked the way of recycling and burning as to solve.
Japanese Patent: " reliquefaction installation of natural gas liquids ", the patent No.; Clear 57-65792; Open day: clear and April 21 57 years (nineteen eighty-two).Structural principle to the reliquefaction installation of this natural gas liquids is summarized as follows: " in storing oil tank, natural gas liquids is housed because the oil tank shell is heated, then temperature raise cause natural gas liquids flash to the gasiform coal mine gas.It by piping enter the coal mine gas compressor, the compression after coal mine gas deliver in the cold coal vaporizer by piping, cold coal vaporizer is by cold coal compressor and cold coal condenser, realize cold coal circulation route, the gas of being carried is the coal mine gas of cold coal, the temperature that is cooled to stipulate with ammonia, by gas balance piping, condensed device transportation of liquefied natural gas.Be liquefied as natural gas liquids in irritating from the natural gas liquids condensed device to oil then and enter liquefied gas in the oil tank, by being immersed in pumping in the oil conveying of boosting.This device needs to use two compressors, and coal mine gas is compressed, and lacks safety precautions in total system, and it is applicable to the use that the inner liquefied gas of hold tank liquefies again, and be unsuitable for the liquefaction again of multiple emptying gas is used.
In view of this, purpose of the present invention is to design a kind of liquefied gas recovery and liquefaction again that is applicable to multiple emptying, adopts once compression, becomes liquid after cooling off, and technical process is simple, has perfect safety precautions and economic benefit high.
For achieving the above object, the present invention is achieved in that
The present invention is that method of re-liquefaction and device thereof are reclaimed in a kind of liquefied gas emptying, the technical process that liquefied gas reclaims, and principal feature is to adopt directly suction recovery, compression, cooling, isolating method; Its processing parameter span of control is:
The intake pressure of spiral-lobe compressor liquefied gas: 0.01～0.3MPa,
The inlet temperature of spiral-lobe compressor liquefied gas :-5～40 ℃ of MPa,
The top hole pressure of spiral-lobe compressor liquefied gas: 1.1～1.3MPa,
The temperature out of spiral-lobe compressor liquefied gas :≤80 ℃.
Gas pressure when the separating tank top reaches 1.3MPa, and after metering was regulated in automatic control, the liquefied gas of not liquefiable (comprised C
1, C
2), be disposed to the emptying tower automatically.In whole device; be equipped with and improve reliable robot control system(RCS): for safety and the normal operation that guarantees compressor; on device, several transmitters are housed; these transmitters are passed to the running status that programmable controller (PIC) reaches demonstration, control, interlocking gear; as intake pressure＜0.01MPa, top hole pressure＞1.3MPa, inlet temperature＜-5; during temperature out＞80 ℃, all sound is sent in order, light is reported to the police and shut down.To important operating parameter, also take many cover control sfgd.s, as: preceding in compressor inlet and outlet (this device is located at the cooler outlet place), butterfly valve and pressure inverting controller are housed; Butterfly valve is under the control of pressure inverting controller, and when intake pressure was lower than set(ting)value, then butterfly valve cut out automatically and shuts down; When the separation pot liquid reaches the setting liquid level, open automatically by the variable valve of automatic control setter control, make liquid drain into lpg spherical tank; If the separating tank top can not comprise (C by liquefied gas
1And C
2) when being higher than the pressure of setting, open automatically by the variable valve that the pressure inverting controller on separating tank is controlled, make gas enter the emptying house steward, through water-sealed tank to the emptying tower.This retrieving arrangement is to be connected in parallel on the emptying house steward, so, when unit breaks down shutdown, can not influence original production technique yet.
When spiral-lobe compressor just starts, when total system is not set up normal air pressure as yet, the cooling of spiral-lobe compressor inside, the liquid of being adopted by lpg spherical tank is for its cooling, when total system was in normal operating conditions, then spiral-lobe compressor was cooled off it by the liquefied gas liquid in the separating tank.
This device can reclaim following gas: the emptying of (1) lpg spherical tank safety valve and the gas of leakage; (2) liquefied gas tank field pump, pipeline repair emptying gas; (3) gas of releasing in the spherical tank processing parameter adjustment process summer; (4) liquefied gas pump leaves, stops in the process, the gas that is discharged during pump depletion; (5) gas of in pouring process, being discharged of tank car etc.
The present invention compared with the prior art, its advantage:
One, technical process is simple, and equipment is few, and the liquefied gas of recovery becomes liquid after once compressing, cooling off;
Two, perfect security measures is arranged in the whole recovery device, the time be in work absolute safe and reliable, as:
1, unit liquefied gas inlet pressure control range is between 0.01～0.3MPa (gauge pressure).
(1) report to the police when intake pressure＞0.3MPa (gauge pressure), the special speed of the high value of speed control by frequency variation then, the operation of compressor unit full load, unnecessary gas advances the emptying house steward and discharges to the emptying tower;
(2) in 0.1～0.3MPa (gauge pressure), control automatically by speed control by frequency variation;
(3) in 0.05～0.1MPa (gauge pressure), speed control by frequency variation low value constant rotational speed axle is inhaled;
(4) in 0.02～0.05MPa (gauge pressure), exit gas is got back to the unit import automatically;
(5) in 0.015～0.02MPa (gauge pressure), unit inlet adjusting valve is regulated automatically;
(6) when equaling 0.01MPa (gauge pressure), machine group alarm auto stop.
2, unit liquefied gas inlet temperature is controlled at:
(1) inlet temperature＞30 ℃ warning automatically,
(2) auto stop during inlet temperature=40 ℃,
(3) report to the police automatically during inlet temperature＜0 ℃,
(4) auto stop during inlet temperature=-5 ℃.
3, between the top hole pressure span of control of retrieving arrangement liquefied gas: 1.1～1.3MPa (gauge pressure).
(1) report to the police during top hole pressure＞1.3MPa, liquefied gas goes the emptying tower by the automated randomized adjustment of variable valve,
(2) during top hole pressure=1.33MPa, compressor automatic interlock is shut down,
(3) top hole pressure=1.35 o'clock, safety valve is opened, and enters the emptying tower,
(4) during top hole pressure＜1.3MPa, variable valve cuts out automatically.
4, the unit temperature out is controlled at:
(1) report to the police automatically during temperature out=80 ℃,
(2) auto stop during temperature out＞85 ℃.
Three, the whole recovery device is in parallel with liquefied gas emptying house steward, shuts down or repairing so unit or device break down, and also can not influence original production technique.
Four, obvious economic: this yield that installs recyclable liquefied gas emptying is 900M
3/ h, can move every year more than 8000 hours, so gas of deduction 10%, the annual clean flammable tolerance that reclaims reaches 7500 tons, not only can save a large amount of energy, obtain huge economic benefit, and can solve the pollution of torch gas emptying to atmospheric environment, its social benefit also is conspicuous.
The present invention can also obtain further instruction from the following drawings and embodiment:
Fig. 1 is liquefied gas retrieving arrangement of the present invention and process flow diagram.
The drawing explanation
1-emptying house steward, 2,4,11,14,17,19,27,29,33,37-pipe, the 3-buffer tank, 5,22,34-pressure inverting controller, 6,18,25,28, the 32-hand control valve, the 7-filter, the 8-butterfly valve, 9-spiral-lobe compressor, 10-motor, the 12-water cooler, 13,15,24, the 36-check valve, the 16-separating tank, 20,23, the 26-variable valve, 21-automatic control setter, 30-water-sealed tank, 31-emptying tower, the 35-visor.
Below in conjunction with accompanying drawing embodiments of the invention are described in detail:
The present invention is that method of re-liquefaction and device thereof are reclaimed in a kind of liquefied gas emptying.
Now that its method and retrieving arrangement division is as follows:
One, the technical process of liquefied gas recovery: the principal feature of this technology is to adopt methods such as directly suction recovery, compression, cooling and separation, and its concrete steps are: liquefied gas emptying enters emptying house steward 1; At first liquefied gas (being gasiform) cushions, liquefied gas after the buffering once compresses, spiral-lobe compressor is in the compressed liquefied gas process, liquid with liquefaction cools off it, intake pressure before compression is 0.01～0.3MPa, inlet temperature is-5～40 ℃, and the top hole pressure after the compression is 1.1～1.3MPa, and temperature out is≤80 ℃; Liquefied gas after the compression (most liquefied gas become liquid, the small part liquefied gas are still arranged after cooling, also become liquid) cools off, and the gas that is divided into not liquefiable after cooling (comprises C
1, C
2Deng) and liquable liquid (C
3, C
4Deng) two kinds of compounding substances, its cooled pressure is reduced to 0.05～0.1MPa, the temperature of coolant outlet≤40 ℃; Gas, liquid separate, and the ratio of the gas after the separation, liquid is 1: 9; After gas, liquid separate, when the liquid level of liquid surpasses set(ting)value, after metering is regulated in automatic control, go out separating tank 16 automatically to lpg spherical tank, and the gas of not liquefiable (comprises C
1, C
2) also go out separating tank 16 automatically and drain into emptying tower 31.
Two, realize that liquefied gas emptying reclaims the device of method of re-liquefaction: comprise that compressor 9, water cooler 12 and separating tank 16 form.By pipe 2 emptying house steward 1 is fused with buffer tank 3, make unsettled liquefied gas in buffer tank 3, carry out voltage stabilizing; Buffer tank 3 links to each other with spiral-lobe compressor 9 by pipe 4, on the pipe 4 pressure inverting controller 5 is housed, hand control valve 6, filter 7 and butterfly valve 8, liquefied gas is by pipe 4 and hand control valve 6 after voltage stabilizing, filter 7 and butterfly valve 8 enter spiral-lobe compressor 9, the intake pressure that liquefied gas after the voltage stabilizing advances spiral-lobe compressor 9 is 0.01～0.3MPa, and inlet temperature is-5～40 ℃; Spiral-lobe compressor 9 is connected with motor 10, and motor 10 is equipped with pressure inverting controller 34; The pipe 33 of band check valve 36, visor 35 and hand control valve 32 also is housed on the spiral-lobe compressor 9, and the other end of pipe 33 leads to lpg spherical tank, and pipe 11 is housed between spiral-lobe compressor 9 and the water cooler 12.Pipe 4 is linked to each other with separating tank 16 by pipe 37.On the pipe 37 check valve 24, variable valve 23 and hand control valve 25 are housed, and the other end of pressure inverting controller 5 links to each other with variable valve 23, and pressure inverting controller 5 is switches of regulating and controlling valve 23.Water cooler 12 is cooled off by industrial cooling circulating water, the pipe 14 that has check valve 13, water cooler 12 and pipe 37 are connected together, on the top of separating tank 16, be equipped with on the pipe 27 of safety valve and its top and band variable valve 26 be housed, the pipe 29 of hand control valve 28,29 link to each other with emptying house steward 1 respectively with pipe and manage 27, pressure inverting controller 22 is contained on the top of separating tank 16, and its other end is connected with variable valve 26, when the gas of the not liquefiable at separating tank 16 tops (comprises C
1And C
2) surpass to set pressure the time, open variable valve 26 automatically by pressure inverting controller 22, make it enter emptying house steward 1 and water-sealed tank 30 to emptying tower 31 through managing 29; When the pressure of separating tank 16 during greater than 1.4MPa (gauge pressure), the safety valve on the pipe 27 is opened, and gas is got back among the emptying house steward 1; Be connected to the pipe 19 of band variable valve 20 and hand control valve 18 in the bottom of separating tank 16, lead to lpg spherical tank and manage 19 the other end.Automatic control setter 21 links to each other with variable valve 20 with separating tank 16 respectively.When the liquable liquefied gas liquid in the separating tank 16 surpasses the liquid level of setting, open automatically by automatic control setter 21 regulating and controlling valves 20, make liquid go out separating tank 16, enter lpg spherical tank through managing 19.One check valve 15 is housed on separating tank 16 bottoms, and this check valve 15 is the usefulness of separating tank 16 blowdowns.Pipe 17 is contained between pipe 33 and the pipe 19; When spiral-lobe compressor 9 just starts running, and total system is not when setting up standard atmosphere pressure as yet, and the cooling of spiral-lobe compressor 9 by the liquid of lpg spherical tank, enters in the spiral-lobe compressor 9 by visor 35, check valve 36 through managing 33, and it is cooled off; After system sets up standard atmosphere pressure, turn off the liquid that comes by lpg spherical tank, use instead by the liquid in the separating tank 16, by pipe 19 through manage 17, pipe 33 enters in the spiral-lobe compressor 9, it is cooled off.
Claims (6)
1, method of re-liquefaction is reclaimed in a kind of liquefied gas emptying: its technical process: comprise that liquefied gas emptying enters the emptying house steward; It is characterized in that:
A. at first liquefied gas cushions;
B. the liquefied gas after the buffering once compresses, and compressor cools off it with the liquid that liquefies in the compressed liquefied gas process, intake pressure before the compression is 0.01～0.3MPa, inlet temperature is-5～40 ℃, and the top hole pressure after the compression is 1.1～1.3MPa, and temperature out is≤80 ℃;
C. the liquefied gas after the compression cools off, and is divided into gas and two kinds of compounding substances of liquable liquid of not liquefiable after cooling, and its cooled pressure is reduced to 0.05～0.1MPa, coolant outlet temperature≤40 ℃;
D. gas, liquid separate, and the ratio of the gas after the separation, liquid is 1: 9.
2, a kind of device of realizing liquefied gas emptying recovery method of re-liquefaction; Comprise compressor (9), water cooler (12) and separating tank (16), it is characterized in that: pipe (2) fuses emptying house steward (1) with buffer tank (3), buffer tank (3) links to each other with spiral-lobe compressor (9) by pipe (4), spiral-lobe compressor (9) is connected with motor (10), pipe (33) one ends are connected on the spiral-lobe compressor (9), the other end leads to lpg spherical tank, between spiral-lobe compressor (9) and water cooler (12), pipe (11) is housed, pipe (4) links to each other with separating tank (16) through pipe (37), pipe (14) connects together water cooler (12) and pipe (37) again, separating tank (16) top is connected to pipe (27) and pipe (29), be communicated with emptying house steward (1) respectively and manage (27) and manage (29), separating tank (16) bottom is connected to pipe (19), and the other end of managing (19) leads to lpg spherical tank, is provided with pipe (17) between pipe (19) and pipe (33).
3, the device of method of re-liquefaction is reclaimed in liquefied gas emptying according to claim 2, it is characterized in that: pressure inverting controller (5) is housed, hand control valve (6), filter (7) and butterfly valve (8) on the pipe (4); Pipe (37) is provided with variable valve (23), check valve (24) and hand control valve (25); On the pipe (14) check valve (13) is arranged; Pipe (27) is provided with safety valve; On the pipe (29) variable valve (26) and hand control valve (28) are housed; Pipe (19) is provided with variable valve (20) and hand control valve (18); Hand control valve (32) is housed, visor (35) and check valve (36) on the pipe (33).
4, the device of method of re-liquefaction is reclaimed in liquefied gas emptying according to claim 2, and it is characterized in that: the other end of pressure inverting controller (5) links to each other with variable valve (23),
5, the device of method of re-liquefaction is reclaimed in liquefied gas emptying according to claim 2, it is characterized in that: also be respectively equipped with pressure inverting controller (22) and automatic control setter (21) on the separating tank (16), and pressure inverting controller (22) is connected with setter (26), and automatic control setter (21) links to each other with variable valve (20).
6, the device of method of re-liquefaction is reclaimed in liquefied gas emptying according to claim 2, and it is characterized in that: motor (10) is provided with pressure inverting controller (34).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95113320A CN1055948C (en) | 1995-10-30 | 1995-10-30 | Reclaiming and reliquefying method and its equipment for liquefied gas venting to atmosphere |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95113320A CN1055948C (en) | 1995-10-30 | 1995-10-30 | Reclaiming and reliquefying method and its equipment for liquefied gas venting to atmosphere |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1124273A CN1124273A (en) | 1996-06-12 |
| CN1055948C true CN1055948C (en) | 2000-08-30 |
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ID=5079936
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95113320A Expired - Fee Related CN1055948C (en) | 1995-10-30 | 1995-10-30 | Reclaiming and reliquefying method and its equipment for liquefied gas venting to atmosphere |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1055948C (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5775792A (en) * | 1980-10-28 | 1982-05-12 | Teraoka Shoichi | Tool box which can freely be bent |
| SU947594A1 (en) * | 1980-08-06 | 1982-07-30 | Всесоюзный Научно-Исследовательский Институт Природных Газов "Вниигаз" | Natural gas processing method |
| SU1576805A1 (en) * | 1988-04-06 | 1990-07-07 | Институт Проблем Машиностроений Ан Усср | Compressor |
-
1995
- 1995-10-30 CN CN95113320A patent/CN1055948C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU947594A1 (en) * | 1980-08-06 | 1982-07-30 | Всесоюзный Научно-Исследовательский Институт Природных Газов "Вниигаз" | Natural gas processing method |
| JPS5775792A (en) * | 1980-10-28 | 1982-05-12 | Teraoka Shoichi | Tool box which can freely be bent |
| SU1576805A1 (en) * | 1988-04-06 | 1990-07-07 | Институт Проблем Машиностроений Ан Усср | Compressor |
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| Publication number | Publication date |
|---|---|
| CN1124273A (en) | 1996-06-12 |
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