CN105299458A - Storage tank system for preparing LNG by oxygen-contained coalbed methane - Google Patents
Storage tank system for preparing LNG by oxygen-contained coalbed methane Download PDFInfo
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- CN105299458A CN105299458A CN201510872248.1A CN201510872248A CN105299458A CN 105299458 A CN105299458 A CN 105299458A CN 201510872248 A CN201510872248 A CN 201510872248A CN 105299458 A CN105299458 A CN 105299458A
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Abstract
The invention discloses a storage tank system for preparing LNG by oxygen-contained coalbed methane; and the storage tank system comprises an LNG storage tank unit, a center control unit, a detecting unit and a BOG gas replacement unit. The storage tank system can accurately realize timely prewarning and exhaust of dangerous BOG gas through the multi-channel gas component detecting unit and the BOG gas replacement unit, and achieves safe storage of LNG prepared by the oxygen-contained coalbed methane.
Description
Technical field
The invention belongs to LNG storage field, be specifically related to a kind of stocking system of coalbed methane containing oxygen to prepare liquefied natural gas.
Background technique
LNG is the abbreviation of LNG Liquefied natural gas, and main component is made up of methane.LNG is cooled to-162 DEG C by the rock gas of gaseous state at ambient pressure, makes it to be condensed into liquid.Greatly can save storage and transportation space after natural gas liquefaction, and have that calorific value is large, performance high, be a kind of clean, energy efficiently.
Under current energy crisis and environmental protection pressure, exploitation utilizes the novel energy such as coal-seam gas, shale gas to become the sight of World Focusing.Coalbed methane containing oxygen is in coal mining process, the elementary by-product that extraction goes out in order to ensure safety of coal mines exploitation.Its main component is methane, and as can be seen from its component content, coal-seam gas is the energy and the industrial chemicals of outbalance.But because its composition is comparatively complicated in the coal-seam gas that obtains of this mode extraction, CH4 content low (usually between 30% ~ 70%), and containing aerobic.Particularly methane content is less than to the coal-seam gas of 50%, due to the dangerous property of oxygen content height process, it is breakneck combustion-supporting and pro-knock agent, constrain the comprehensive utilization of coalbed methane containing oxygen, therefore be that this low density coalbed methane containing oxygen is directly burnt or discharges for a long time, cause resource profligacy and to environment.
Along with the development of technology, purify at low concentration coal-bed gas at present and produce in the field of rock gas, occurred the liquefaction technology of multiple coalbed methane containing oxygen.Publication number is that the Chinese patent of CN101928617A and CN101928617A individually discloses low concentration coal-bed gas and produces LNG technique and gas-liquid separation device for oxygenous coal bed containing oxygen cryogenic liquefying, this technique and device adopt azeotrope refrigeration cycle, virgin gas after purification is liquefied and is separated, obtains LNG product.In addition, publication number is that the Chinese patent application of CN1952569 discloses a kind of liquefaction process containing air coal-seam gas, and its cold is produced by gas expansion.
In existing coalbed methane containing oxygen liquefaction process and device, direct oxygenated fluid method causes may containing this safety problem of aerobic in its LNG product.LNG is between the storage tank storage life, and oxygen is mixed into BOG gas may exist potential safety hazard.But existing LNG storage tank does not take in and strick precaution this safety problem.In view of this, the present invention proposes the storage tank system that a kind of coalbed methane containing oxygen produces LNG, early warning in time also can discharge dangerous BOG gas, reach the object that safe storage coalbed methane containing oxygen produces LNG.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of coalbed methane containing oxygen to produce the storage tank system of LNG, this LNG storage tank system early warning in time also can discharge dangerous BOG gas, reaches the object of safe storage LNG.
For achieving the above object, the invention provides following technological scheme:
Coalbed methane containing oxygen produces a storage tank system of LNG, and described storage tank system comprises LNG storage tank unit, centralized control unit, detection unit, BOG gas displacement unit; LNG storage tank unit is for the LNG that stores coalbed methane containing oxygen and produce and qualified conventional LNG, centralized control unit is used for Monitoring and Controlling whole system and runs, detection unit is for detecting concentration of component and the temperature of each gas in BOG gas, and BOG gas displacement unit is for replacing the BOG gas in storage tank;
Described LNG storage tank unit comprises the LNG storage tank 1 that coalbed methane containing oxygen is tentatively produced, qualified conventional LNG storage tank 7; Described centralized control unit comprises master controller 6, temperature transducer 2, liquid level sensor 3, pressure transducer 4, temperature and pressure transmitter 11, suspension device A; Described detection unit comprises concentration of component and temperature detection center 5, concentration of component and temperature-detecting device 51; Described BOG gas displacement unit comprises cryopump 8, vaporizer 9, suction booster 10, two-position three way magnetic valve 12, gasification gas discharge conduit 13, gas ducting 19, BOG gas displacement outlet valve 18;
Described LNG storage tank 7 is connected with gas ducting 19 by cryopump 8, vaporizer 9, suction booster 10, temperature and pressure transmitter 11, two-position three way magnetic valve 12 successively and imports in LNG storage tank 1; Described two-position three way magnetic valve 12 1 exports and is connected with gasification gas discharge conduit 13; Described concentration of component and temperature-detecting device 51 are imported in LNG storage tank 1 for detecting the concentration of component of different spatial and temperature and data being sent to concentration of component and temperature detection center 5 by suspension device A; Described BOG gas displacement outlet valve 18 is arranged at LNG storage tank 1 tank deck; Described master controller 6 is by programed temperature sensor 2, liquid level sensor 3, pressure transducer 4, temperature and pressure transmitter 11, suspension device B, concentration of component and temperature detection center 5, two-position three way magnetic valve 12, BOG gas displacement outlet valve 18.
Further, described centralized control unit also comprises suspension device B, and described suspension device B is for adjusting the exit position of gas ducting 19, and described suspension device B is controlled by master controller 6.
Further, described component and temperature-detecting device 51 and the suspension device A that matches have multiple respectively.
Beneficial effect of the present invention is: a kind of coalbed methane containing oxygen that the present invention proposes produces the storage tank system of LNG, early warning in time also can discharge dangerous BOG gas, reach the object that safe storage coalbed methane containing oxygen produces LNG.
Accompanying drawing explanation
In order to make object of the present invention, technological scheme and beneficial effect clearly, the invention provides following accompanying drawing and being described:
Fig. 1 is the storage tank system schematic diagram that a kind of coalbed methane containing oxygen produces LNG;
Fig. 2 is the storage tank system schematic diagram that a kind of preferred coalbed methane containing oxygen produces LNG.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
As shown in Figure 1: the storage tank system that coalbed methane containing oxygen produces LNG comprises LNG storage tank unit, centralized control unit, detection unit, BOG gas displacement unit; LNG storage tank unit is for the LNG that stores coalbed methane containing oxygen and produce and qualified conventional LNG, centralized control unit is used for Monitoring and Controlling whole system and runs, detection unit is for detecting concentration of component and the temperature of each gas in BOG gas, and BOG gas displacement unit is for replacing the BOG gas in storage tank; Described LNG storage tank unit comprises the LNG storage tank 1 that coalbed methane containing oxygen is tentatively produced, qualified conventional LNG storage tank 7; Described centralized control unit comprises master controller 6, temperature transducer 2, liquid level sensor 3, pressure transducer 4, temperature and pressure transmitter 11, suspension device A; Described detection unit comprises concentration of component and temperature detection center 5, one or more concentration of component and temperature-detecting device 51; Described BOG gas displacement unit comprises cryopump 8, vaporizer 9, suction booster 10, two-position three way magnetic valve 12, gasification gas discharge conduit 13, gas ducting 19, BOG gas displacement outlet valve 18;
Described LNG storage tank 7 is connected with gas ducting 19 by cryopump 8, vaporizer 9, suction booster 10, temperature and pressure transmitter 11, two-position three way magnetic valve 12 successively and imports in LNG storage tank 1; Described two-position three way magnetic valve 12 1 exports and is connected with gasification gas discharge conduit 13; Described concentration of component and temperature-detecting device 51 are imported in LNG storage tank 1 for detecting the concentration of component of different spatial and temperature and data being sent to concentration of component and temperature detection center 5 by suspension device A; Described BOG gas displacement outlet valve 18 is arranged at LNG storage tank 1 tank deck; Described master controller 6 is by programed temperature sensor 2, liquid level sensor 3, pressure transducer 4, temperature and pressure transmitter 11, suspension device B, concentration of component and temperature detection center 5, two-position three way magnetic valve 12, BOG gas displacement outlet valve 18.
Described centralized control unit also comprises suspension device B, and described suspension device B is for adjusting the exit position of gas ducting 19, and described suspension device B is controlled by master controller 6.
The storage tank system that described coalbed methane containing oxygen produces LNG normally works and runs as follows:
When the LNG that coalbed methane containing oxygen is produced enters storage tank storage, now each system unit is started working, centralized control unit detects LNG liquid level change in LNG storage tank 1 by liquid level sensor 3 and adjusts suspension device A in real time, gas component concentrations and temperature transducer 51 is made to be in different spatial, concentration of component and the temperature of different spatial is detected with this, also control the exit position that suspension device B adjusts gas ducting 19 simultaneously, when in master controller detection storage tank, BOG gas oxygen concentration exceedes predetermined range, master controller 6 sends instruction and starts BOG gas displacement unit, open cryopump 8, LNG in LNG storage tank 7 through vaporizer 9 gasify after through suction booster 10 supercharging, temperature and pressure transmitter 11 detects that temperature and pressure and temperature transducer 51 and pressure transducer 4 compare when not reaching regulation discharge pressure and temperature, two-position three way magnetic valve 12 action allows gasifying gas enter gasification gas discharge route 13, be drained into BOG gas recovery conduit, when reaching regulation discharge pressure and temperature, two-position three way magnetic valve 12 action allows substitution gas enter filling channel 19, and BOG gas displacement outlet valve 18 is opened simultaneously, discharges the BOG gas of displacement.When gas composition sensors and temperature transducer 51 detect that inside LNG storage tank 1, BOG gas oxygen concentration is in predetermined range, master controller 6 sends instruction and stops BOG gas displacement unit.Certainly all control logics are all that prior programmed is controlled by master controller 6.
In described device, temperature transducer 2 is mainly for detection of LNG temperature in LNG storage tank 1.
Reach timely early warning by gas component detection unit and BOG gas displacement unit in the present invention and discharge dangerous BOG gas, reaching the LNG that safe storage coalbed methane containing oxygen is produced.
Fig. 2 is the storage tank system schematic diagram that a kind of preferred coalbed methane containing oxygen produces LNG.Wherein gas component concentrations and temperature transducer 51 have three, are labeled as 20,11,22 respectively, and the suspension device A used that cooperates with it also has 3, is labeled as 15,16,17 respectively.Gas component concentrations and temperature transducer are set to multiple, gas component concentrations and the temperature of different spatial in storage tank 1 can be detected respectively simultaneously, can realize more accurately reaching timely early warning by multi-channel gas component detection unit and BOG gas displacement unit and discharging dangerous BOG gas, reach the LNG that safe storage coalbed methane containing oxygen is produced.
What finally illustrate is, above preferred embodiment is only in order to illustrate technological scheme of the present invention and unrestricted, although by above preferred embodiment to invention has been detailed description, but those skilled in the art are to be understood that, various change can be made to it in the form and details, and not depart from claims of the present invention limited range.
Claims (3)
1. coalbed methane containing oxygen produces a storage tank system of LNG, it is characterized in that, described storage tank system comprises LNG storage tank unit, centralized control unit, detection unit, BOG gas displacement unit;
Described LNG storage tank unit comprises the LNG storage tank (1) that coalbed methane containing oxygen is tentatively produced, qualified conventional LNG storage tank (7);
Described centralized control unit comprises master controller (6), temperature transducer (2), liquid level sensor (3), pressure transducer (4), temperature and pressure transmitter (11), suspension device (A); Described detection unit comprises concentration of component and temperature detection center (5), concentration of component and temperature-detecting device (51); Described BOG gas displacement unit comprises cryopump (8), vaporizer (9), suction booster (10), two-position three way magnetic valve (12), gasification gas discharge conduit (13), gas ducting (19), BOG gas displacement outlet valve (18);
Described LNG storage tank (7) is connected with gas ducting (19) by cryopump (8), vaporizer (9), suction booster (10), temperature and pressure transmitter (11), two-position three way magnetic valve (12) successively and imports in LNG storage tank (1); Described two-position three way magnetic valve (12) exports and is connected with gasification gas discharge conduit (13); Described concentration of component and temperature-detecting device (51) are imported in LNG storage tank (1) for detecting the concentration of component of different spatial and temperature and data being sent to concentration of component and temperature detection center (5) by suspension device (A); Described BOG gas displacement outlet valve (18) is arranged at LNG storage tank (1) tank deck; Described master controller (6) is by programed temperature sensor (2), liquid level sensor (3), pressure transducer (4), temperature and pressure transmitter (11), suspension device (B), concentration of component and temperature detection center (5), two-position three way magnetic valve (12), BOG gas displacement outlet valve (18).
2. a kind of coalbed methane containing oxygen produces the storage tank system of LNG according to claim 1, it is characterized in that, described centralized control unit also comprises suspension device (B), described suspension device (B) is for adjusting the exit position of gas ducting (19), and described suspension device (B) is controlled by master controller (6).
3. a kind of coalbed methane containing oxygen produces the storage tank system of LNG according to claim 1, it is characterized in that, described component and temperature-detecting device (51) and the suspension device (A) matched have multiple respectively.
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| CN201510872248.1A CN105299458B (en) | 2015-12-02 | 2015-12-02 | A kind of coalbed methane containing oxygen produces LNG tank system |
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| CN201510872248.1A CN105299458B (en) | 2015-12-02 | 2015-12-02 | A kind of coalbed methane containing oxygen produces LNG tank system |
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| CN105299458B CN105299458B (en) | 2017-07-11 |
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| JP2000240896A (en) * | 1999-02-24 | 2000-09-08 | Osaka Gas Co Ltd | Liquefied gas storage tank |
| CN102323295A (en) * | 2011-09-30 | 2012-01-18 | 中广核工程有限公司 | System for monitoring concentration of hydrogen in containment vessel |
| CN203345510U (en) * | 2013-05-27 | 2013-12-18 | 中国人民解放军后勤工程学院 | Nitrogen charging device for oil tank |
| CN104848033A (en) * | 2015-05-29 | 2015-08-19 | 中国石油化工股份有限公司 | Alkane storage tank protection method |
| CN204611340U (en) * | 2015-04-15 | 2015-09-02 | 兰州展辉电子科技有限公司 | For the airtight cover plate of air sac type of storage tank or tank car energy-conserving and environment-protective washing unit |
| CN104925410A (en) * | 2015-05-29 | 2015-09-23 | 中国石油化工股份有限公司 | Method for preventing gas-phase burning explosion of alkane storage tank |
-
2015
- 2015-12-02 CN CN201510872248.1A patent/CN105299458B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000240896A (en) * | 1999-02-24 | 2000-09-08 | Osaka Gas Co Ltd | Liquefied gas storage tank |
| CN102323295A (en) * | 2011-09-30 | 2012-01-18 | 中广核工程有限公司 | System for monitoring concentration of hydrogen in containment vessel |
| CN203345510U (en) * | 2013-05-27 | 2013-12-18 | 中国人民解放军后勤工程学院 | Nitrogen charging device for oil tank |
| CN204611340U (en) * | 2015-04-15 | 2015-09-02 | 兰州展辉电子科技有限公司 | For the airtight cover plate of air sac type of storage tank or tank car energy-conserving and environment-protective washing unit |
| CN104848033A (en) * | 2015-05-29 | 2015-08-19 | 中国石油化工股份有限公司 | Alkane storage tank protection method |
| CN104925410A (en) * | 2015-05-29 | 2015-09-23 | 中国石油化工股份有限公司 | Method for preventing gas-phase burning explosion of alkane storage tank |
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