CN205262060U

CN205262060U - Portable BOG recovery unit

Info

Publication number: CN205262060U
Application number: CN201520914130.6U
Authority: CN
Inventors: 朱忠泉
Original assignee: JIANGSU AEROSPACE HEWLETT ENVIRONMENTAL PROTECTION TECHNOLOGY Co Ltd
Current assignee: JIANGSU AEROSPACE HEWLETT ENVIRONMENTAL PROTECTION TECHNOLOGY Co Ltd
Priority date: 2015-11-17
Filing date: 2015-11-17
Publication date: 2016-05-25
Anticipated expiration: 2025-11-17

Abstract

The utility model relates to a portable BOG recovery unit, including nitrogen compressor sled piece, nitrogen gas water -cooling sled piece and BOG liquefaction sled piece, nitrogen compressor sled piece is including nitrogen gas storage tank, nitrogen compressor, expander, nitrogen gas water -cooling sled piece is including nitrogen gas water chiller, water tank, pump, BOG liquefaction sled piece is including heat exchanger, LNG storage bottle, the heat exchanger includes fore -cooling room and condensation chamber, and technology safety is simple, compact structure's BOG retrieves the reliquefaction device to low -temperature nitrogen is for the gaseous heat transfer of heat transfer medium and BOG and make its liquefaction, the utility model discloses it to the reliance of external BOG compressor, has advantages such as safety, energy -conservation, high efficiency, environmental protection to have broken away from current BOG recovery unit. Whole massing design, the compact structure of prizing of device to can fix becomes portable BOG recovery unit on the vehicle, the BOG that can satisfy various occasions, a plurality of websites retrieves the requirement, improves the rate of utilization of device.

Description

A kind of portable BOG retracting device

Technical field

The utility model relates to LNG Storage, Transport technical field, is specifically related to the transportable BOG retracting device of a kind of compact conformation, can be used for the BOG gas of multiple websites in recovery zone.

Background technology

Along with socioeconomic rapid growth, the continuous of oil price risen, and natural gas---this clean energy resource forms solid demand gradually, and current social economy has been produced to very far-reaching influence. In non-renewable energy resources, it is increasing that Natural Gas Consumption Using increases proportion in the various energy. In China, the gas reserves of verifying is about 3.8 tcms, comparatively speaking still than more rich, but a little less than utilizing natural gas to be but relative thin, data demonstration, natural gas energy resource only accounts for 2% ratio in China's energy consumption structure. In order to improve the ratio of clean energy resource in primary energy, on the one hand, China accelerates Introduced From Abroad natural gas and liquefied natural gas (LNG) carrys out Optimization of Energy Structure, on the other hand, China has built a series of gas engineerings (for example transfering natural gas from the west to the east etc.), and natural gas consumption will increase considerably.

Domestic each LNG peak regulation station under these circumstances, satellite station, automobile filling station, LCNG gas station sets up like the mushrooms after rain. But, transport at storage tank at LNG, the links such as handling all can inevitably produce the boil-off gas that temperature is lower, i.e. BOG. The generation of BOG can make the pressure in LNG storage tank raise, and to website, operation brings danger. Owing to not having downstream line to discharge near general LNG website, do not have space and resource to carry out BOG yet and liquefy again, therefore BOG can only emptying, and this method is not only the wasting of resources, but also can cause environmental pollution, allows enterprise bear economic loss simultaneously.

Conventional BOG processing method has four kinds at present, and the first is on LNG ship, BOG to be turned back to cabin tank; The second is for being directly discharged into atmosphere; The third is by the BOG input pipe network after compression; The 4th kind is recondensation process treatments B OG. In above-mentioned four kinds of methods, the first processing mode is only applicable to special circumstances and occasion; Directly be discharged into atmosphere and can cause environmental pollution, and have potential safety hazard. The third and the 4th kind of mode are current comparatively common BOG ways of recycling. No matter but be BOG to be inputted to pipe network or by its condensation again, BOG compressor is all the key equipment of processing. At present, domestic Compressor Manufacturing factory there is no design, manufactures the mature experience without oily reciprocating compressor may operate under DEG C low temperature of (natural gas) inlet temperature-160, want to reclaim BOG and just can only rely on the expensive compressor of external import, limited economy and operability that BOG reclaims. In addition, these two kinds of processing modes are comparatively extensive in large-scale LNG receiving station application, but due to its expensive expense investment, at small-sized LNG peak regulation station, satellite station, automobile filling station, L-CNG gas station is difficult to launch.

Utility model content

Technical problem to be solved in the utility model is to provide a kind of portable BOG retracting device for above drawback, and process safety is simple, the BOG of compact conformation reclaims reliquefaction installation, taking low temperature nitrogen as heat transfer medium and BOG gas converting heat make its liquefaction; The present invention has broken away from the dependence of existing BOG retracting device to external BOG compressor, has the advantages such as safe, energy-conservation, efficient, environmental protection. The design of device entirety sled blocking, compact conformation, and can be fixed on vehicle and become portable BOG retracting device, the BOG that can meet various occasions, multiple websites reclaims requirement, improves the utilization rate of device.

For solving the problems of the technologies described above, the technical solution of the utility model is:

A kind of portable BOG retracting device, comprises nitrogen compressor sled piece, nitrogen water-cooled sled piece and BOG liquefaction sled piece;

Described nitrogen compressor sled piece comprises nitrogen storage tank, nitrogen compressor, decompressor, and described nitrogen water-cooled sled piece comprises nitrogen water cooler, water tank, pump, and described BOG liquefaction sled piece comprises heat exchanger, LNG storage bottle, and described heat exchange comprises fore-cooling room and condensation chamber;

The outlet of described nitrogen storage tank is connected by the first pipeline with the import of nitrogen compressor, and the first control valve is housed on the first pipeline; Nitrogen compressor outlet is connected by second pipe with the hot logistics import of nitrogen water cooler, and the cold logistics outlet of nitrogen water cooler is connected with water tank, and water tank is connected with pump, and pump is connected with the cold logistics import of nitrogen water cooler, forms peripheral passage; The hot logistics outlet of nitrogen water cooler is connected by the 3rd pipeline with the import of decompressor pressurized end; The outlet of decompressor pressurized end is connected by the 4th pipeline with the hot logistics import of heat exchanger fore-cooling room; The hot logistics outlet of fore-cooling room is connected by the 5th pipeline with the import of decompressor expanding end; The outlet of decompressor expanding end is connected by the 6th pipeline with the cold logistics import of heat exchanger condensation chamber; The cold logistics outlet of heat exchanger condensation chamber is connected by the 7th pipeline with the cold logistics import in fore-cooling room; The cold logistics outlet of heat exchanger fore-cooling room is connected by the 8th pipeline with nitrogen storage tank import, and the 8th pipeline is provided with the second by-pass valve control; BOG gas is introduced the hot logistics import of heat exchanger condensation chamber by the 9th pipeline, the 9th pipeline is provided with the 3rd by-pass valve control; The hot logistics outlet of condensation chamber is connected by the tenth pipeline with the import of LNG storage bottle.

The portable BOG retracting device of above-mentioned one, wherein, described heat exchanger, decompressor expanding end are incubated processing, and described the 3rd by-pass valve control adopts low temperature major axis valve, and described the 5th pipeline, the 6th pipeline, the 7th pipeline and the 9th pipeline external be coated one layer of heat preservation layer all.

The portable BOG retracting device of above-mentioned one, wherein, in the first pipeline, second pipe, the 3rd pipeline, the 4th pipeline, the 5th pipeline, the 6th pipeline, the 7th pipeline, the 8th pipeline, the 9th pipeline, the tenth pipeline, nitrogen storage tank and LNG storage bottle, be equipped with temperature inductor and pressure inductor.

The portable BOG retracting device of above-mentioned one, wherein, described nitrogen compressor is reciprocating without oily nitrogen compressor, and decompressor is turbo-expander, and heat exchanger is plate-fin or tubular heat exchanger.

The beneficial effects of the utility model are:

(1) this device is made up of nitrogen compressor sled piece, nitrogen water-cooled sled piece and BOG liquefaction sled piece, technique is simple, compact conformation, simple to operate, safety and stability, entirety becomes sled to be easy to mobile transport, the many places of a set of equipment recycle, recovery that can feasible region BOG, reduces cost of investment, improves utilization ratio of device.

(2) traditional B OG recovery process generally all needs 2 even multiple heat exchangers, the employing precooling of this process innovation, condensation integral heat exchanger, the low temperature nitrogen of cold heat exchanger condensation chamber logistics outlet is introduced to the cold logistics import in heat exchanger fore-cooling room, the nitrogen that unnecessary cold is passed to the hot logistics import in heat exchanger fore-cooling room carries out precool heat exchanger, improve cryogenic energy utilization rate, reduce energy consumption, reduced heat exchanger quantity, reduced equipment volume.

(3) compressor that this process unit adopts be normal reciprocating without oily nitrogen compressor, decompressor is common turbo-expander, heat exchanger is plate-fin and tubular heat exchanger, very common on market at home, without dependence on import, reduce equipment investment cost, be easy to safeguard.

Brief description of the drawings

Fig. 1 is the utility model structure chart.

Detailed description of the invention

Below in conjunction with accompanying drawing, the utility model is described in further detail.

A portable BOG retracting device as shown in the figure, comprises nitrogen compressor sled piece, nitrogen water-cooled sled piece and BOG liquefaction sled piece;

Described nitrogen compressor sled piece comprises nitrogen storage tank 1, nitrogen compressor 3, decompressor 7, described nitrogen water-cooled sled piece comprises nitrogen water cooler 4, water tank 5, pump 6, described BOG liquefaction sled piece comprises heat exchanger 8, LNG storage bottle 11, and described heat exchanger 8 comprises fore-cooling room 15 and condensation chamber 16;

The outlet 17 of described nitrogen storage tank 1 is connected by the first pipeline 19 with the import 18 of nitrogen compressor 3, and the first control valve 2 is housed on the first pipeline 19; Compressor 3 exports 20 and is connected by second pipe 22 with the hot logistics import 21 of nitrogen water cooler 4, the cold logistics outlet 23 of nitrogen water cooler 4 is connected with water tank 5, water tank 5 is connected with pump 6, and pump 6 is connected with the cold logistics import 24 of nitrogen water cooler 4, forms peripheral passage; The hot logistics outlet 25 of nitrogen water cooler 4 is connected by the 3rd pipeline 27 with decompressor 7 pressurized end 48 imports 26; Decompressor 7 pressurized ends 48 export 28 and are connected by the 4th pipeline 30 with the hot logistics import 29 of heat exchanger 8 fore-cooling rooms; The hot logistics outlet 31 of fore-cooling room 15 is connected by the 5th pipeline 33 with decompressor 7 expanding end 49 imports 32; Decompressor 7 expanding end outlets 34 are connected by the 6th pipeline 36 with the cold logistics import 35 of heat exchanger 8 condensation chambers; The cold logistics outlet 37 of heat exchanger 8 condensation chamber is connected by the 7th pipeline 39 with the cold logistics import 38 in fore-cooling room; The cold logistics outlet 40 of heat exchanger 8 fore-cooling rooms 15 is connected by the 8th pipeline 42 with nitrogen storage tank 1 import 41, and the 8th pipeline 42 is provided with the second by-pass valve control 9; Hot logistics import 44, the nine pipelines 43 that BOG gas is introduced heat exchanger 8 condensation chambers 16 by the 9th pipeline 43 are provided with the 3rd by-pass valve control 10; The hot logistics outlet 45 of condensation chamber 16 is connected by the tenth pipeline 47 with 11 imports 46 of LNG storage bottle.

Described heat exchanger 8, decompressor 7 expanding ends are incubated processing, and described the 3rd by-pass valve control adopts low temperature major axis valve, and described the 5th pipeline, the 6th pipeline, the 7th pipeline and the 9th pipeline external be coated one layer of heat preservation layer all.

In described the first pipeline, second pipe, the 3rd pipeline, the 4th pipeline, the 5th pipeline, the 6th pipeline, the 7th pipeline, the 8th pipeline, the 9th pipeline, the tenth pipeline, nitrogen storage tank and LNG storage bottle, be equipped with temperature inductor and pressure inductor.

Described BOG recovery process is as follows:

1, the start precooling stage

(1) first by-pass valve control 2 and the second by-pass valve control 9 are opened, the 3rd by-pass valve control 10 is closed, 0.1Mpa, the nitrogen of 20 DEG C enter nitrogen compressor 3 and are compressed to 0.6Mpa through the first control valve 2, temperature is increased to 150 ~ 200 DEG C, then enter nitrogen water cooler 4 and lower the temperature, nitrogen temperature is down to 25 DEG C;

(2) 0.6Mpa, the nitrogen of 25 DEG C enter decompressor 7 compression end, are further compressed to 0.7Mpa, and temperature is increased to 45 DEG C, then enters heat exchanger 8 fore-cooling rooms, and now fore-cooling room not yet has cold logistics to enter, and therefore 0.7Mpa, the nitrogen temperature of 45 DEG C are constant;

(3) 0.7Mpa, the nitrogen of 45 DEG C enters decompressor 7 expanding ends by the heat exchanger hot logistics outlet in 8 fore-cooling rooms, expand through decompressor 7, Pressure Drop is to 0.03Mpa, temperature is down to-20 DEG C and enter the cold logistics entrance of heat exchanger 8 condensation chamber, BOG gas is not yet introduced in the now hot logistics import of heat exchanger 8 condensation chamber, therefore 0.03Mpa, the nitrogen reflux of-20 DEG C enters the heat exchanger cold logistics import in 8 fore-cooling rooms, 0.03Mpa, the nitrogen of-20 DEG C and 0.7Mpa, the nitrogen heat exchange of 45 DEG C makes 0.7Mpa, the nitrogen temperature of 45 DEG C is reduced to-5 DEG C, 0.03Mpa, the temperature of the nitrogen of-20 DEG C is increased to 20 DEG C and enters nitrogen storage tank and circulate above-mentioned flow process, by continuous circulation, the fore-cooling room of heat exchanger 8 hot logistics outlet nitrogen temperature constantly reduces, and after 60min, decompressor 7 expanding end nitrogen temperatures reach-180 DEG C,

2, BOG liquefaction stage

(1) when decompressor 8 expanding end outlet nitrogen temperatures reach after-180 DEG C, open the 3rd by-pass valve control 10, the BOG gas of-150 DEG C enters heat exchanger condensation chamber, with 0.03Mpa, the nitrogen heat exchange of-180 DEG C, obtains after enough colds liquefaction for LNG and flows into LNG storage bottle 11; By the continuous circular flow of equipment, finally realize the continuous liquefaction of BOG and reclaim.

Here description of the present utility model and application is illustrative; not want scope of the present utility model to limit in the above-described embodiments; therefore, the utility model is not subject to the restriction of the present embodiment, and the technical scheme that any employing equivalence replacement obtains is all in the scope of the utility model protection.

Claims

1. a portable BOG retracting device, is characterized by, and comprises nitrogen compressor sled piece, nitrogen water-cooled sled piece and BOG liquefaction sled piece;

2. the portable BOG retracting device of one as claimed in claim 1, it is characterized by, described heat exchanger, decompressor expanding end are incubated processing, described the 3rd by-pass valve control adopts low temperature major axis valve, and described the 5th pipeline, the 6th pipeline, the 7th pipeline and the 9th pipeline external be coated one layer of heat preservation layer all.

3. the portable BOG retracting device of one as claimed in claim 1, it is characterized by, in the first pipeline, second pipe, the 3rd pipeline, the 4th pipeline, the 5th pipeline, the 6th pipeline, the 7th pipeline, the 8th pipeline, the 9th pipeline, the tenth pipeline, nitrogen storage tank and LNG storage bottle, be equipped with temperature inductor and pressure inductor.

4. the portable BOG retracting device of one as claimed in claim 1, is characterized by, and described nitrogen compressor is reciprocating without oily nitrogen compressor, and decompressor is turbo-expander, and heat exchanger is plate-fin or tubular heat exchanger.