CN104132241A - BOG (boil off gas) diffusing recovering apparatus of LNG (liquefied natural gas) storage tank and control method - Google Patents
BOG (boil off gas) diffusing recovering apparatus of LNG (liquefied natural gas) storage tank and control method Download PDFInfo
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- CN104132241A CN104132241A CN201410369531.8A CN201410369531A CN104132241A CN 104132241 A CN104132241 A CN 104132241A CN 201410369531 A CN201410369531 A CN 201410369531A CN 104132241 A CN104132241 A CN 104132241A
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Abstract
The invention relates to a BOG (boil off gas) diffusing recovering apparatus of an LNG (liquefied natural gas) storage tank and a control method. The apparatus comprises a pressure sensor, a recovery solenoid valve, an air-heated vaporizer, a fuel-gas pressure-regulating box, a connection pipe and a PLC; the pressure sensor is arranged at a diffusing port of the LNG storage tank; the LNG storage tank diffusing port, the automatic recovery solenoid valve, the air-heated vaporizer and the fuel-gas pressure-regulating box are in sequential connection via the connection pipe; the fuel-gas pressure-regulating box is connected with a fuel gas pipe network; the pressure sensor acquires the pressure of the LNG storage tank diffusing port and transmits to the PLC; and the PLC controls the automatic recovery solenoid valve. The apparatus utilizes PLC to automatically monitor BOG pressure and controls the recovery solenoid valve to be turned on or off so as to convey recovered BOG to the fuel gas pipe network via the vaporizer, and the vaporizer is equivalent to a silencer and is capable of eliminating sounds. The apparatus is safe, reliable, environment-friendly and economic. A diffusing solenoid valve, a mechanical diffusing assembly and a manual discharging valve further help to increase the safety of the apparatus. A manual globe valve helps to facilitate equipment to be maintained when failures happen.
Description
Technical field
The invention belongs to chemical machinery field, especially LNG storage tank BOG diffuses recovering device.
Background technique
LNG lays in vaporizing station, often produces unnecessary BOG gas, and most of users manually go execute-in-place valve BOG gas discharging or recovery, and misoperation likely appears in manual operation, in safety, has risk, has also increased personal expenditures.And in discharge process, also have strong noise to occur being difficult to reach the requirement of environmental protection.How to design a kind of employment few, safely, do not have the BOG of noise environmental protection to diffuse recovering device to become the problem of those skilled in the art's research.
Summary of the invention
The problem to be solved in the present invention be to provide a kind of employment few, safely, do not have the BOG of noise environmental protection to diffuse recovering device.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of LNG storage tank BOG diffuses recovering device, comprise pressure transducer, the automatic recovery solenoid valve, empty warm vaporizer, fuel gas pressure-regulating box, connecting tube and PLC, described pressure transducer is located at LNG storage tank diffusion mouth, LNG storage tank diffusion mouth the automatic recovery solenoid valve, empty warm vaporizer, fuel gas pressure-regulating box is linked in sequence successively by connecting tube, fuel gas pressure-regulating box is connected with gas ductwork, pressure transducer gathers the pressure of LNG storage tank diffusion mouth, pass to PLC, PLC controls the automatic recovery solenoid valve and opens and closes.
The two ends of described the automatic recovery solenoid valve are parallel with automatic relief solenoid valve, described in diffuse solenoid valve and be connected with described PLC.
The two ends of described the automatic recovery solenoid valve are parallel with machinery and diffuse assembly.
The two ends of described the automatic recovery solenoid valve are parallel with manual drain valve.
Between described LNG storage tank diffusion mouth and pressure transducer and between LNG storage tank diffusion mouth and the automatic recovery solenoid valve, be equipped with hand stop valve.
LNG storage tank BOG diffuses recovering device controlling method, comprises the steps:
A1, the BOG gas diffusion mouth of LNG storage tank is communicated with recovering device;
A2, pressure transducer detect the pressure of BOG gas;
A3, PLC judge that whether the pressure of BOG gas is higher than the first pressure set points, if just open the automatic recovery solenoid valve, BOG gas is delivered to gas ductwork through pressure regulating feeding, just returns to if not A2.
Also comprise the steps:
The pressure that A4, PLC continue to judge BOG gas, whether higher than the second pressure set points, diffuses solenoid valve if just open, and BOG gas discharging, in atmosphere, just returns to A2 if not.
Also comprise the steps:
A5: mechanical diffusion valve group detects BOG gas pressure, judges that the pressure of BOG gas, whether higher than the 3rd pressure set points, diffuses solenoid valve if just open, and BOG gas discharging, in atmosphere, just repeats above-mentioned action if not.
Advantage and good effect that the present invention has are: the present invention utilizes PLC automatic control system on-line monitoring BOG pressure and controls the keying of the automatic recovery solenoid valve the BOG gas of recovery is transported to gas ductwork through empty temperature vaporizer, and be equivalent to reduced noise by sky temperature vaporizer through the BOG gas of empty temperature vaporizer, be equivalent to an easy baffler, this device is both safe and reliable, again environmental protection and economy; Diffusing solenoid valve, machinery diffuses assembly and manual drain valve and has further increased the Security of this device; When hand stop valve facilitates fault, closing diffusion mouth keeps in repair equipment.
Brief description of the drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is the control flow chart of invention.
In figure:
1. machinery diffuses assembly, 2. automatic relief solenoid valve, 3. manual exhaust valve, 4. the automatic recovery solenoid valve, 5. empty temperature vaporizer, 6. fuel gas pressure-regulating box, 7. pressure transducer, 8.PLC.
Embodiment
Now with reference to the accompanying drawings the specific embodiment of the present invention is described, as shown in Figure 1, a kind of LNG storage tank BOG diffuses recovering device, comprise pressure transducer, the automatic recovery solenoid valve, empty warm vaporizer, fuel gas pressure-regulating box, connecting tube and PLC, described pressure transducer is located at LNG storage tank diffusion mouth, LNG storage tank diffusion mouth the automatic recovery solenoid valve, empty warm vaporizer, fuel gas pressure-regulating box is linked in sequence successively by connecting tube, fuel gas pressure-regulating box is connected with gas ductwork, pressure transducer gathers the pressure of LNG storage tank diffusion mouth, pass to PLC, PLC controls the automatic recovery solenoid valve and opens and closes.
In order further to improve Security, the two ends of described the automatic recovery solenoid valve are parallel with automatic relief solenoid valve, described in diffuse solenoid valve and be connected with described PLC.
The two ends of described the automatic recovery solenoid valve are parallel with machinery and diffuse assembly.
The two ends of described the automatic recovery solenoid valve are parallel with manual drain valve.
Close diffusion mouth when facilitating equipment failure other parts are keeped in repair, between described LNG storage tank diffusion mouth and pressure transducer and between LNG storage tank diffusion mouth and the automatic recovery solenoid valve, be equipped with hand stop valve.
Working principle: when PLC control system detect pressure sensor signal higher than set ceiling value time, control system open the automatic recovery solenoid valve at this moment BOG gas be transported in fuel gas pressure-regulating box and carry out pressure regulation through sky temperature vaporizer, then enter gas ductwork;
If now PLC control system detects that pressure transducer force value is still in limited time high higher than setting pressure, PLC control system is opened automatic relief solenoid valve by emptying unnecessary BOG gas;
If BOG pressure also continue to raise and reach machinery diffuse module sets diffuse pressure time, machinery diffuses assembly and automatically opens and discharge BOG gas;
Whole system is as long as the automatic recovery solenoid valve is just enough to unnecessary BOG gas consumption to be fallen in most cases, and diffuse assembly and automatic relief solenoid valve without uncapping machine tool, because the gas consumption of gas ductwork is enough to consume the BOG gas that storage tank produces, so just avoid waste resource, it is in order to improve Security that automatic relief solenoid valve and machinery diffuse assembly, the backup means of reply special circumstances.
As shown in Figure 2: LNG storage tank BOG diffuses recovering device controlling method, comprises the steps:
A1, the BOG gas diffusion mouth of LNG storage tank is communicated with recovering device;
A2, pressure transducer detect the pressure of BOG gas;
A3, PLC judge that whether the pressure of BOG gas is higher than the first pressure set points, if just open the automatic recovery solenoid valve, BOG gas is delivered to gas ductwork through pressure regulating feeding, just returns to if not A2.
Also comprise the steps:
The pressure that A4, PLC continue to judge BOG gas, whether higher than the second pressure set points, diffuses solenoid valve if just open, and BOG gas discharging, in atmosphere, just returns to A2 if not.
Also comprise the steps:
A5: mechanical diffusion valve group detects BOG gas pressure, judges that the pressure of BOG gas, whether higher than the 3rd pressure set points, diffuses solenoid valve if just open, and BOG gas discharging, in atmosphere, just repeats above-mentioned action if not.
The present invention has following features:
1.PLC control system is by gathering BOG pressure signal automatic analysis force value when pressure is high or automatically open corresponding solenoid valve when too high and control, and what adopt due to system is that PLC controls automatically, has saved duty personnel's quantity, saving manpower;
2.PLC control system collection numerical value is accurate, and reliable performance, avoids human negligence, improves Security;
3.PLC control system logicality is strong, substantially can not produce misoperation, avoids unnecessary danger;
4. in the time that BOG pressure is high, needed personnel to go discharge in the past, go through manually diffusing to be discharged in atmosphere, at this moment exhaust noise is quite large, can reach 80～90 decibels, just can hear ear-piercing sound far away, and device does not also reach while diffusing pressure at BOG and just automatically BOG gas has been transported in gas ductwork through sky temperature vaporizer, quite little through the BOG gas noise of empty temperature vaporizer, be equivalent to a baffler, the appearance of general 40～50 decibels of left and right of noise.Thereby reduce the pollution of noise, improved Environmental security grade;
5. owing to being automatically to control unnecessary BOG gas is transported to endlessly in gas ductwork and goes to have avoided personnel to open frequently discharge, comparing and use the equipment of BOG compressor compresses recycling to save sizable cost (comprising time cost and human cost);
6. the diffusion system that this device is compared storage tank itself has just increased by two solenoid valves, a sky temperature vaporizer, with some pipelines, compare other modes and need to add knock out drum, compressor etc. and saved a large amount of fund costs, and native system is simple in structure maintains easily.
Above embodiments of the invention are had been described in detail, but described content is only preferred embodiment of the present invention, can not be by artificially for limiting practical range of the present invention.All equalization variation and improvement etc. of doing according to the scope of the invention, within all should still belonging to this patent covering scope.
Claims (9)
1. a LNG storage tank BOG diffuses recovering device, it is characterized in that, comprise pressure transducer, the automatic recovery solenoid valve, empty temperature vaporizer, fuel gas pressure-regulating box, connecting tube and PLC, described pressure transducer is located at LNG storage tank diffusion mouth, LNG storage tank diffusion mouth the automatic recovery solenoid valve, empty temperature vaporizer, fuel gas pressure-regulating box are linked in sequence successively by connecting tube, fuel gas pressure-regulating box is connected with gas ductwork, pressure transducer gathers the pressure of LNG storage tank diffusion mouth, pass to PLC, PLC controls the automatic recovery solenoid valve and opens and closes.
2. LNG storage tank BOG according to claim 1 diffuses recovering device, it is characterized in that: the two ends of described the automatic recovery solenoid valve are parallel with automatic relief solenoid valve, described in diffuse solenoid valve and be connected with described PLC.
3. LNG storage tank BOG according to claim 1 and 2 diffuses recovering device, it is characterized in that: the two ends of described the automatic recovery solenoid valve are parallel with machinery and diffuse assembly.
4. LNG storage tank BOG according to claim 1 and 2 diffuses recovering device, it is characterized in that: the two ends of described the automatic recovery solenoid valve are parallel with manual drain valve.
5. LNG storage tank BOG according to claim 3 diffuses recovering device, it is characterized in that: the two ends of described the automatic recovery solenoid valve are parallel with manual drain valve.
6. LNG storage tank BOG according to claim 1 diffuses recovering device, it is characterized in that: between described LNG storage tank diffusion mouth and pressure transducer and between LNG storage tank diffusion mouth and the automatic recovery solenoid valve, be equipped with hand stop valve.
7.LNG storage tank BOG diffuses recovering device controlling method, it is characterized in that: comprise the steps:
A1, the BOG gas diffusion mouth of LNG storage tank is communicated with recovering device;
A2, pressure transducer detect the pressure of BOG gas;
A3, PLC judge that whether the pressure of BOG gas is higher than the first pressure set points, if just open the automatic recovery solenoid valve, BOG gas is delivered to gas ductwork through pressure regulating feeding, just returns to if not A2.
8. LNG storage tank BOG according to claim 7 diffuses recovering device controlling method, it is characterized in that: also comprise the steps:
The pressure that A4, PLC continue to judge BOG gas, whether higher than the second pressure set points, diffuses solenoid valve if just open, and BOG gas discharging, in atmosphere, just returns to A2 if not.
9. LNG storage tank BOG according to claim 8 diffuses recovering device controlling method, it is characterized in that: also comprise the steps:
A5: mechanical diffusion valve group detects BOG gas pressure, judges that the pressure of BOG gas, whether higher than the 3rd pressure set points, diffuses solenoid valve if just open, and BOG gas discharging, in atmosphere, just repeats above-mentioned action if not.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410369531.8A CN104132241A (en) | 2014-07-29 | 2014-07-29 | BOG (boil off gas) diffusing recovering apparatus of LNG (liquefied natural gas) storage tank and control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410369531.8A CN104132241A (en) | 2014-07-29 | 2014-07-29 | BOG (boil off gas) diffusing recovering apparatus of LNG (liquefied natural gas) storage tank and control method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106594522A (en) * | 2016-12-21 | 2017-04-26 | 成都国珈星际固态锂电科技有限公司 | System for intelligently controlling gas emission |
| CN107575736A (en) * | 2017-09-21 | 2018-01-12 | 成都华气厚普机电设备股份有限公司 | A kind of control method of band remnants hydrogen diffusion function hydrogenation plant |
| CN107575735A (en) * | 2017-09-21 | 2018-01-12 | 成都华气厚普机电设备股份有限公司 | Automatic control system and control method with hydrogen recovery function hydrogenation plant |
| CN107816635A (en) * | 2017-12-01 | 2018-03-20 | 中国电力工程顾问集团西北电力设计院有限公司 | Become the anti-blocking making-up air device of absolute altitude ash conveying pipe and anti-blocking supplementing method for air over long distances |
| CN111928119A (en) * | 2020-08-06 | 2020-11-13 | 欧科能源技术(天津)有限公司 | Mine gas safety mixing system and gas mixing ratio control method |
| CN114877251A (en) * | 2022-06-09 | 2022-08-09 | 江苏国富氢能技术装备股份有限公司 | Liquid hydrogen fuel tank pipeline system for liquid hydrogen ship |
| CN114941801A (en) * | 2022-05-27 | 2022-08-26 | 国家石油天然气管网集团有限公司 | BOG (boil off gas) emptying control system of LNG (liquefied Natural gas) receiving station |
-
2014
- 2014-07-29 CN CN201410369531.8A patent/CN104132241A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106594522A (en) * | 2016-12-21 | 2017-04-26 | 成都国珈星际固态锂电科技有限公司 | System for intelligently controlling gas emission |
| CN106594522B (en) * | 2016-12-21 | 2019-05-28 | 成都国珈星际固态锂电科技有限公司 | A kind of system of intelligent control gas discharge |
| CN107575736A (en) * | 2017-09-21 | 2018-01-12 | 成都华气厚普机电设备股份有限公司 | A kind of control method of band remnants hydrogen diffusion function hydrogenation plant |
| CN107575735A (en) * | 2017-09-21 | 2018-01-12 | 成都华气厚普机电设备股份有限公司 | Automatic control system and control method with hydrogen recovery function hydrogenation plant |
| CN107816635A (en) * | 2017-12-01 | 2018-03-20 | 中国电力工程顾问集团西北电力设计院有限公司 | Become the anti-blocking making-up air device of absolute altitude ash conveying pipe and anti-blocking supplementing method for air over long distances |
| CN111928119A (en) * | 2020-08-06 | 2020-11-13 | 欧科能源技术(天津)有限公司 | Mine gas safety mixing system and gas mixing ratio control method |
| CN114941801A (en) * | 2022-05-27 | 2022-08-26 | 国家石油天然气管网集团有限公司 | BOG (boil off gas) emptying control system of LNG (liquefied Natural gas) receiving station |
| CN114877251A (en) * | 2022-06-09 | 2022-08-09 | 江苏国富氢能技术装备股份有限公司 | Liquid hydrogen fuel tank pipeline system for liquid hydrogen ship |
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Application publication date: 20141105 |