CN203704553U - Lng pipeline system vacuum drying device - Google Patents
Lng pipeline system vacuum drying device Download PDFInfo
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- CN203704553U CN203704553U CN201420086259.8U CN201420086259U CN203704553U CN 203704553 U CN203704553 U CN 203704553U CN 201420086259 U CN201420086259 U CN 201420086259U CN 203704553 U CN203704553 U CN 203704553U
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- lng pipeline
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Abstract
The utility model discloses an LNG pipeline system vacuum drying device. The LNG pipeline system vacuum drying device comprises a Roots water ring vacuum pump set and a Roots rotating piece vacuum pump set and is provided with a water supply system for supplying water to the vacuum pump sets. Inlets of the vacuum pump sets are respectively in parallel connection with a vacuumizing pipeline through high vacuum butterfly valves, and the vacuumizing pipeline is communicated with an LNG pipeline system through a gate valve. The vacuum pump sets are adopted to pump air out of the LNG pipeline system, nitrogen over 10 DEG C is led to the LNG pipeline system through a nitrogen adding port, and after the long-time vacuumizing process, dew points in the LNG pipeline system can meet the regulated requirements. The LNG pipeline system vacuum drying device dries the LNG pipeline system thoroughly, is not subject to the influence of the pipe diameter and can fully dry accumulated water in pipelines, valves and other pipeline accessories.
Description
(1) technical field:
The utility model relates to liquefied natural gas (LNG) stand all kinds of pipeline dry technologies, particularly a kind of LNG pipeline system Minton dryer.
(2) background technology:
LNG is a kind of clean, efficient energy, and compared with other energy, environmental benefit and efficiency of energy utilization are high.Along with the continuous growth of country to energy demand, the development of LNG industry, by the energy resource structure of optimizing China, effectively solves the dual problem of the energy safety of supply, ecological environmental protection, realizes economy and social sustainable development and plays a significant role.
LNG pipeline system will carry out pipeline (pipeline) pressure test before operation going into operation, and the pipe design pressure of this part medium is all more than 1.79Mpa, and some design pressures are more up to 15.6MPa.Regulation according to GB50235-2010 " Industrial Metal pipeline engineering job specfication " to pipeline pressure test: " pressure test should be taking liquid as test(ing) medium; in the time that the design pressure of pipeline is less than or equal to 0.6MPa; also can adopt gas is test(ing) medium, but should take effective safety measure.In the time that the design pressure of pipeline is greater than 0.6MPa, design and establishing unit is thought when hydraulic test is unrealistic, is proposed and is agreed to through construction unit by design document, can adopt the gas pressure test of 8.6.5 article of regulation of GB50235 specification to replace hydraulic test ".And certain LNG project pressure piping has at home occurred serious security incident while adopting air pressure to carry out pressure test, adopt the water pressure test so LNG project pipeline pressure test is now normal.But LNG pipeline is cryogenic media pipeline (165 DEG C), require extremely tight for the moisture entrapment in pipeline, otherwise may cause valve to freeze and cause the ice at the low-lying place of pipeline stifled, valve cannot switch, affects displacement, can cause the major accident of stopping transportation when serious.Therefore, must complete and pipeline purges draining to carry out LNG pipe-line system after qualified dry in LNG pipeline pressure test, leak test, make LNG pipe-line system put into operation before dew point in pipeline reach the requirement of regulation.
Existing dry technology method one:
Original pipeline drying construction, the most often adopts dry air drying method, and drying principles refers to dry air low pressure is entered in pipeline and purged, and utilizes low dew point air to reach dry object to the adsorption capacity of moisture.Moisture in pipeline can and be purged out pipeline by dry air below by low dew point dry air absorption in the ideal situation.But dry air can not all purge out pipeline by the humid air of adsorption moisture in practice.Judge that dry method is, input endlessly dry air and detect pipe outlet air humidity or dew point, in the time that it is less than predetermined value, show drying.Another kind of detection method is to detect pipe outlet and entrance dew point simultaneously, shows drying in the time that both are equal.
The shortcoming of this method is for large diameter pipeline, and occupation area of equipment is very large, needs consumption great amount of fuel oil or electric power to produce dry air; The method is not fine to the drying effect at " dead angle " on valve and pipeline; After LNG pipeline drying, also will carry out nitrogen replacement, program is many.
Art methods two:
At present, LNG pipeline adopts nitrogen drying method more, the principle of nitrogen drying displacement is to utilize liquid nitrogen tank car that liquid nitrogen is transported to the dry scene, pipeline station that needs, be connected with field erected liquid nitrogen storage tank, liquid nitrogen is stored in liquid nitrogen storage tank, liquid nitrogen storage tank is connected with field erected air temperature type vaporizer, liquid nitrogen gasification is become to normal temperature nitrogen, and then through electric heater heating, make air drying nitrogen be heated to 40 DEG C～50 DEG C, supply need be carried out dry pipe-line system, with dew point analysis instrument or moisture detector pipeline section end to pipe-line system in content of water in gas carry out sample analysis.
The shortcoming of this method is that liquid nitrogen consumption is large, and cost is high, large to the dry intractability of the ponding in valve and pipe-line system " dead angle ".
(3) utility model content:
For this reason, the utility model proposes a kind of LNG pipeline system Minton dryer, to solve exist in art methods one very large to the dry equipment needed thereby floor space of large diameter pipeline, to need to consume great amount of fuel oil or electric power, large with the liquid nitrogen consumption existing in art methods two, cost is high, and the technical problem of " the dry intractability to the ponding in valve and pipe-line system dead angle is large " of method one and method two general character etc.
The technical scheme of the utility model LNG pipeline system Minton dryer, comprise and vacuumize unit, difference vacuumizes unit described in being and comprises Roots's Water-ring vacuum pump assembly and Roots's sliding vane rotary vacuum pump unit, and described Roots's Water-ring vacuum pump assembly comprises fore pump 2SK-3 twin-stage water ring pump, line pump JZ30 lobe pump and main pump JZ70 lobe pump and the corresponding control system arranging; Described Roots's sliding vane rotary vacuum pump unit comprises fore pump 2X-4A twin-stage sliding vane rotary vacuum pump and main pump JZ30 lobe pump and the corresponding control system arranging, and disposes the water system supplying water to vacuumizing unit; The import of described Roots's Water-ring vacuum pump assembly and Roots's sliding vane rotary vacuum pump unit is parallel to respectively on vacuum lead by high vacuum butterfly valve, and described vacuum lead is communicated with LNG pipeline system by gate valve.
On described LNG pipeline system, be provided with precision digital Pressure gauge, the manometric pressure range of described precision digital is-0.1MPa～2MPa that the degree of accuracy is 0.05%F.S.
On described LNG pipeline system, be provided with nitrogen and add entrance.
The hydraulic pressure of described water system (running water system) is at least 0.1MPa.
The beneficial effects of the utility model:
By taking the technical scheme of the utility model LNG pipeline system Minton dryer, reach thoroughly dry, be not subject to the changeable impact of caliber, can be fully dry to the ponding in LNG pipeline, valve, threeway, elbow, pipe platform and other conduit fittings, equipment can be controlled automatically, constructs pollution-free, and operating expenses is low, applied widely, practical.
(4) brief description of the drawings:
Fig. 1 is the schematic flow sheet of a kind of embodiment of the utility model.
Figure number mark: 1, LNG pipeline system; 2, nitrogen adds entrance; 3, precision digital Pressure gauge; 4, valve; 5, Roots's Water-ring vacuum pump assembly; 6, Roots's sliding vane rotary vacuum pump unit; 5-1,2SK-3 twin-stage water ring pump; 5-2, JZ30 lobe pump; 5-3, JZ70 lobe pump; 6-1,2X-4A twin-stage sliding vane rotary vacuum pump; 7, water system; 8, high vacuum butterfly valve; 9, vacuum lead; 10, gate valve.
(5) detailed description of the invention:
Below in conjunction with accompanying drawing illustrated embodiment, the technical solution of the utility model is described further.
The utility model LNG pipeline system Minton dryer comprises and vacuumizes unit, the described unit that vacuumizes comprises Roots's Water-ring vacuum pump assembly 5 and Roots's sliding vane rotary vacuum pump unit 6, being provided with water system 7 supplies water to Roots's Water-ring vacuum pump assembly 5 and Roots's sliding vane rotary vacuum pump unit 6, the running water system that described water system 7 is factory, the hydraulic pressure control of running water system is more than 0.1MPa, as shown in Figure 1.
Described Roots's Water-ring vacuum pump assembly 5 is mainly by fore pump 2SK-3 twin-stage water ring pump 5-1, line pump JZ30 lobe pump 5-2 with as main pump JZ70 lobe pump 5-3 and the corresponding composition of the control system arranging; Roots's sliding vane rotary vacuum pump unit 6 is mainly by fore pump 2X-4A twin-stage sliding vane rotary vacuum pump 6-1 and main pump JZ30 lobe pump 5-2 and the corresponding composition of the control system arranging; Roots's Water-ring vacuum pump assembly 5(is 2SK-3 twin-stage water ring pump 5-1) import connect on vacuum lead 9 by the manual high vacuum butterfly valve 8 of DN150, Roots's sliding vane rotary vacuum pump unit 6(is 2X-4A twin-stage sliding vane rotary vacuum pump 6-1) import connect on the connection mouth of Roots's Water-ring vacuum pump assembly 5 and vacuum lead 9 by the manual high vacuum butterfly valve 8 of DN100, described vacuum lead 9 is connected LNG pipeline system 1 by DN150 gate valve 10, as shown in Figure 1.
Between each pipeline of LNG pipeline system 1, be interconnected by valve 4, adopt heat tape to heat each valve 4, heating and temperature control is below 120 DEG C; Near vacuumizing unit and away from vacuumizing, the precision digital Pressure gauge 3 that LCD shows being installed on the LNG pipeline system 1 of unit, the pressure range of described precision digital Pressure gauge 3 is-0.1MPa～2MPa, the degree of accuracy is 0.05%F.S, corresponding to distant place precision digital Pressure gauge 3, nitrogen is set on LNG pipeline system 1 and adds entrance 2, as shown in Figure 1.
The described connecting pipe vacuumizing between unit and LNG pipeline system 1 will clear up and purge after installing, confirm in pipeline after clean no-sundries can with vacuumize unit and LNG pipeline system 1 is connected; In the pipeline of described water system 7, also to purge and clean out, after confirmation is clean, can come into operation.
The operating procedure of the utility model LNG pipeline system Minton dryer is as follows:
1, employing vacuumizes unit (being Roots's Water-ring vacuum pump assembly 5 and Roots's sliding vane rotary vacuum pump unit 6) and outwards bleeds from LNG pipeline system 1 is interior, constantly reduce the vacuum in LNG pipeline system 1 until reach water saturation vapour pressure under pipeline inner wall temperature (be set to-99400Pa of the vacuum～-99200Pa in corresponding LNG pipeline system 1), make to remain in the water boiling in LNG pipeline system 1 and vaporize rapidly and be evacuated unit and take away, in this process, a vacuum changing value of every 5 minutes records, there is will calculate slip if any leaking, the Volume Changes causing when slip be no more than water film evaporation Volume Changes 5% time, just can carry out next step operation.
2, for to make the interior temperature of LNG pipeline system 1 higher than the water vapor temperature under described vacuum degree condition, ensure that water does not freeze and makes the vacuum in LNG pipeline system 1 constant, need add entrance 2 by nitrogen and pass into more than 10 DEG C nitrogen in LNG pipeline system 1, the nitrogen amount entering adapts with the amount of vacuumizing.
3, through long vacuum, make the interior dew point of LNG pipeline system 1 reach regulation requirement.
4, adopt dew point method to carry out an acceptance inspection to the dry mass of LNG pipeline system 1, in first LNG pipeline system 1 after vacuum drying, be full of nitrogen, until line pressure reaches 0.1MPa～0.2MPa, then leave standstill 12h～24h dew point of measurement gas again, measured value reaches required value, and between measured value, the absolute value of difference is no more than 5 DEG C for qualified.
In vacuum, described Roots's Water-ring vacuum pump assembly 5 is with Roots's sliding vane rotary vacuum pump unit 6 respectively at different times work, and Roots's Water-ring vacuum pump assembly 5 is mainly used in rapid draing in early stage LNG pipeline system 1, and the speed vacuumizing is fast; Later stage that described Roots's sliding vane rotary vacuum pump unit 6 is mainly used in LNG pipeline system 1 is meticulous to be vacuumized dryly, and Roots's sliding vane rotary vacuum pump unit 6 will can start after LNG pipeline system 1 vacuum reaches certain pressure value, and now Roots's Water-ring vacuum pump assembly 5 cuts out.
Claims (4)
1.LNG pipeline system Minton dryer, comprise and vacuumize unit, it is characterized in that: described in vacuumize unit and comprise Roots's Water-ring vacuum pump assembly (5) and Roots's sliding vane rotary vacuum pump unit (6), described Roots's Water-ring vacuum pump assembly (5) comprises fore pump 2SK-3 twin-stage water ring pump (5-1), line pump JZ30 lobe pump (5-2) and main pump JZ70 lobe pump (5-3) and the corresponding control system arranging; Described Roots's sliding vane rotary vacuum pump unit (6) comprises fore pump 2X-4A twin-stage sliding vane rotary vacuum pump (6-1) and main pump JZ30 lobe pump (5-2) and the corresponding control system arranging, and disposes the water system (7) supplying water to vacuumizing unit; It is upper that the import of described Roots's Water-ring vacuum pump assembly (5) and Roots's sliding vane rotary vacuum pump unit (6) is parallel to respectively vacuum lead (9) by high vacuum butterfly valve (8), and described vacuum lead (9) is communicated with LNG pipeline system (1) by gate valve (10).
2. LNG pipeline system Minton dryer according to claim 1, it is characterized in that: on described LNG pipeline system (1), be provided with precision digital Pressure gauge (3), the pressure range of described precision digital Pressure gauge (3) is-0.1MPa～2MPa that the degree of accuracy is 0.05%F.S.
3. LNG pipeline system Minton dryer according to claim 1, is characterized in that: on described LNG pipeline system (1), be provided with nitrogen and add entrance (2).
4. according to the LNG pipeline system Minton dryer described in any one in claim 1～3, it is characterized in that: the hydraulic pressure of described water system (7) is at least 0.1MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420086259.8U CN203704553U (en) | 2014-02-27 | 2014-02-27 | Lng pipeline system vacuum drying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420086259.8U CN203704553U (en) | 2014-02-27 | 2014-02-27 | Lng pipeline system vacuum drying device |
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| Publication Number | Publication Date |
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| CN203704553U true CN203704553U (en) | 2014-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420086259.8U Withdrawn - After Issue CN203704553U (en) | 2014-02-27 | 2014-02-27 | Lng pipeline system vacuum drying device |
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| CN (1) | CN203704553U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103791698A (en) * | 2014-02-27 | 2014-05-14 | 中国石油天然气第六建设公司 | LNG pipeline system vacuum drying method and vacuum drying device |
| CN111735278A (en) * | 2020-06-17 | 2020-10-02 | 安徽欧非亚机械设备制造有限公司 | Vacuum drying equipment for variable pressure valve |
-
2014
- 2014-02-27 CN CN201420086259.8U patent/CN203704553U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103791698A (en) * | 2014-02-27 | 2014-05-14 | 中国石油天然气第六建设公司 | LNG pipeline system vacuum drying method and vacuum drying device |
| CN103791698B (en) * | 2014-02-27 | 2015-11-18 | 中国石油天然气第六建设公司 | LNG pipeline system vacuum drying method and Minton dryer |
| CN111735278A (en) * | 2020-06-17 | 2020-10-02 | 安徽欧非亚机械设备制造有限公司 | Vacuum drying equipment for variable pressure valve |
| CN111735278B (en) * | 2020-06-17 | 2021-12-28 | 安徽欧非亚机械设备制造有限公司 | Vacuum drying equipment for variable pressure valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140709 Effective date of abandoning: 20151118 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |