CN204704607U - A kind of cold compensation type liquefied natural gas filling device - Google Patents

Abstract

The utility model belongs to LNG (LNG Liquefied natural gas) loading technique field, be specifically related to a kind of cold compensation type liquefied natural gas filling device, agent structure comprises liquid nitrogen storage tank, liquid nitrogen pipes, control system, vision-control system, first cold complementary module, second cold complementary module, 3rd cold complementary module, 4th cold complementary module, a modulating valve, No. two modulating valve, No. three modulating valve, No. four modulating valve, No. five modulating valve, No. six modulating valve, No. seven modulating valve, No. eight modulating valve, the emptying mechanism of liquid nitrogen, carrying railway carriage, LNG storage tank, LNG pipeline and liquid nitrogen storage knock out drum, each modulating valve in control system and vision-control system and modulating valve group respectively telecommunications manner of breathing connects, realize controlling and regulating, cold can be supplemented in time in LNG filling process, the heat exchange that counteracting LNG and environment produce, avoid the problem due to LNG evaporation formation BOG, its structure is simple, easy to operate, and energy-conserving and environment-protective are applied widely.

Description

A kind of cold compensation type liquefied natural gas filling device

Technical field:

The utility model belongs to LNG (LNG Liquefied natural gas) loading technique field, be specifically related to a kind of cold compensation type liquefied natural gas filling device, LNG cold is supplemented by liquid nitrogen, the attached pipe fitting in LNG filling apparatus local is made to be in low temperature environment all the time, avoid because LNG evaporation forms BOG (flashed vapour), be applicable to any LNG filing provision, comprise LNG filling vehicle, LNG annotates ship, LNG filling station etc.

Background technique:

At present, in the filling process of LNG (LNG Liquefied natural gas) loading system, external heat constantly passes to LNG through tank body material and attached pipe fitting etc., LNG is made inevitably to form BOG (flashed vapour) due to evaporation, in the prior art, the process for BOG mainly adopts directly output technique and recondensation process to reclaim, and directly exports in technique, the BOG of LNG storage tank, by after pressure needed for compressor direct weighting to gas ductwork, enters outer defeated pipe network; In recondensation process, the BOG of LNG storage tank passes through compressor pressurizes, Under Water Pumps in storage tank sends the LNG of uniform pressure, both direct heat transfers in after-condenser by a certain percentage, LNG excessively cold after pressurization utilizes " aobvious cold " by most of BOG condensation, again through the pressurization of second level pump, after vaporizer gasification, send into high pressure pipe network.Existing two kinds of BOG recovery process all need certain external condition, have the outer throughput rate of stable gasification or near have low pressure gas user; But about have half not possess the various conditions of BOG process in LNG satellite station of China and LNG automobile filling station, therefore unload and in operation must to airborne release or directly torch burn the rock gas of about 1-2% mass percent, this phenomenon is more outstanding in domestic LNG user, methane is directly discharged into 21 times that the greenhouse effect produced in air are carbon dioxide, not only cause economic loss, also severe contamination air, this and current energy-conserving and environment-protective theme grave fault; In recondensation process, the liquefaction again after LNG gasification makes loading system complex structure, not only increases financial cost, too increases the difficulty of operation.Therefore, research and development are a kind of supplements LNG cold by liquid nitrogen, makes the attached pipe fitting in LNG filling apparatus local be in low temperature environment all the time, avoid because LNG evaporation forms BOG, be applicable to the cold compensation type LNG filling apparatus of any LNG filing provision, have very much society and economic value, have a extensive future.

Summary of the invention:

The purpose of this utility model is the shortcoming overcoming prior art existence, design is a kind of supplements LNG cold by liquid nitrogen, the attached pipe fitting in LNG filling apparatus local is made to be in low temperature environment all the time, avoid, because LNG evaporation forms BOG, being applicable to the cold compensation type liquefied natural gas filling device of any LNG filing provision.

To achieve these goals, agent structure of the present utility model comprises liquid nitrogen storage tank, liquid nitrogen pipes, control system, vision-control system, the first cold complementary module, the second cold complementary module, the 3rd cold complementary module, the 4th cold complementary module, a modulating valve, No. two modulating valve, No. three modulating valve, No. four modulating valve, No. five modulating valve, No. six modulating valve, No. seven modulating valve, No. eight modulating valve, the emptying mechanism of liquid nitrogen, carrying railway carriage, LNG storage tank, LNG pipeline and liquid nitrogen storage knock out drums, first cold complementary module, the second cold complementary module, the 3rd cold complementary module and the 4th cold complementary module series type textural association form cold complementary module group, a modulating valve, No. two modulating valve, No. three modulating valve, No. four modulating valve, No. five modulating valve, No. six modulating valve, No. seven modulating valve and No. eight modulating valve corresponding relevant position combination formation modulating valve group being serially connected with cold complementary module group respectively, liquid nitrogen storage tank is fixedly mounted on the left bottom, inside of carrying railway carriage, the control system of integral structure and vision-control system are arranged on the inside upper left quarter of carrying railway carriage, and cease with each modulating valve telecommunications in modulating valve group respectively and be connected, LNG storage tank is fixedly mounted on the lower right, inside of carrying railway carriage, and liquid nitrogen pipes is fixedly connected with the emptying mechanism of liquid nitrogen with after liquid nitrogen storage knock out drum through the first cold complementary module, carrying railway carriage, the second cold complementary module, the 3rd cold complementary module, the 4th cold complementary module after being stretched out by liquid nitrogen storage tank successively, liquid nitrogen pipes is equipped with a modulating valve between liquid nitrogen storage tank and the first cold complementary module, liquid nitrogen pipes is equipped with No. three modulating valve between the outside of carrying railway carriage and the second cold complementary module, liquid nitrogen pipes is equipped with No. four modulating valve between the second cold complementary module and the 3rd cold complementary module, liquid nitrogen pipes is equipped with No. five modulating valve between the 3rd cold complementary module and the 4th cold complementary module, liquid nitrogen pipes is equipped with No. seven modulating valve between the 4th cold complementary module and liquid nitrogen storage knock out drum, liquid nitrogen pipes is equipped with No. eight modulating valve between liquid nitrogen storage knock out drum and the emptying mechanism of liquid nitrogen, LNG pipeline is connected with the equipment of LNG Liquefied natural gas of need annotating with after the 4th cold complementary module through the first cold complementary module, carrying railway carriage, the second cold complementary module, the 3rd cold complementary module after being stretched out by LNG storage tank successively, LNG pipeline is equipped with No. two modulating valve between LNG storage tank and the first cold complementary module, and LNG pipeline is equipped with No. six modulating valve between the 3rd cold complementary module and the 4th cold complementary module, each modulating valve in control system and vision-control system and modulating valve group respectively telecommunications manner of breathing connects, and realizes controlling and regulating.

The utility model compared with prior art, cold can be supplemented in time in LNG filling process, the heat exchange that counteracting LNG and environment produce, avoid the problem due to LNG evaporation formation BOG, its structure is simple, easy to operate, energy-conserving and environment-protective, applied widely, be mainly used in LNG filling vehicle, LNG annotates ship and LNG filling station.

Accompanying drawing illustrates:

Fig. 1 is agent structure principle schematic of the present utility model.

Embodiment:

Also by reference to the accompanying drawings the utility model is described further below by embodiment.

Embodiment:

The agent structure of the cold compensation type liquefied natural gas filling device that the present embodiment relates to comprises liquid nitrogen storage tank 1, liquid nitrogen pipes 11, control system 2, vision-control system 3, first cold complementary module 41, second cold complementary module 42, 3rd cold complementary module 43, 4th cold complementary module 44, a modulating valve 51, No. two modulating valve 52, No. three modulating valve 53, No. four modulating valve 54, No. five modulating valve 55, No. six modulating valve 56, No. seven modulating valve 57, No. eight modulating valve 58, the emptying mechanism 6 of liquid nitrogen, carrying railway carriage 7, LNG storage tank 8, LNG pipeline 81 and liquid nitrogen storage knock out drum 9, first cold complementary module 41, second cold complementary module 42, the 3rd cold complementary module 43 and the 4th cold complementary module 44 series type textural association form cold complementary module group, a modulating valve 51, No. two modulating valve 52, No. three modulating valve 53, No. four modulating valve 54, No. five modulating valve 55, No. six modulating valve 56, No. seven modulating valve 57 and No. eight modulating valve 58 corresponding relevant position combination formation modulating valve group being serially connected with cold complementary module group respectively, liquid nitrogen storage tank 1 is fixedly mounted on the left bottom, inside of carrying railway carriage 7, the control system 2 of integral structure and vision-control system 3 are arranged on the inside upper left quarter of carrying railway carriage 7, and cease with each modulating valve telecommunications in modulating valve group respectively and be connected, LNG storage tank 8 is fixedly mounted on the lower right, inside of carrying railway carriage 7, and liquid nitrogen pipes 11 is fixedly connected with the emptying mechanism 6 of liquid nitrogen through after the first cold complementary module 41, carrying railway carriage 7, second cold complementary module 42, the 3rd cold complementary module 43, the 4th cold complementary module 44 and liquid nitrogen storage knock out drum 9 after being stretched out by liquid nitrogen storage tank 1 successively, liquid nitrogen pipes 11 is equipped with a modulating valve 51 between liquid nitrogen storage tank 1 and the first cold complementary module 41, liquid nitrogen pipes 11 is equipped with No. three modulating valve 53 between the outside of carrying railway carriage 7 and the second cold complementary module 42, liquid nitrogen pipes 11 is equipped with No. four modulating valve 54 between the second cold complementary module 42 and the 3rd cold complementary module 43, liquid nitrogen pipes 11 is equipped with No. five modulating valve 55 between the 3rd cold complementary module 43 and the 4th cold complementary module 44, liquid nitrogen pipes 11 is equipped with No. seven modulating valve 57 between the 4th cold complementary module 44 and liquid nitrogen storage knock out drum 9, liquid nitrogen pipes 11 is equipped with No. eight modulating valve 58 between liquid nitrogen storage knock out drum 9 and the emptying mechanism 6 of liquid nitrogen, LNG pipeline 81 is connected with the equipment of the LNG that need annotate through after the first cold complementary module 41, carrying railway carriage 7, second cold complementary module 42, the 3rd cold complementary module 43 and the 4th cold complementary module 44 after being stretched out by LNG storage tank 8 successively, LNG pipeline 81 is equipped with No. two modulating valve 52, LNG pipelines 81 and is equipped with No. six modulating valve 56 between the 3rd cold complementary module 43 and the 4th cold complementary module 44 between LNG storage tank 8 and the first cold complementary module 41, control system 2 and vision-control system 3 connect with each modulating valve difference telecommunications manner of breathing in modulating valve group, realize controlling and regulating.

When the cold compensation type liquefied natural gas filling device that the present embodiment relates to realizes LNG filling, control system 2 and vision-control system 3 open a modulating valve 51 and No. two modulating valve 52 simultaneously, liquid nitrogen in liquid nitrogen storage tank 1 enters in cold complementary module group by liquid nitrogen pipes 11, LNG in LNG storage tank 8 enters in cold complementary module group by LNG pipeline 81, in LNG filling process, the temperature and pressure of cold complementary module that each modulating valve that control system 2 and vision-control system 3 provide according to modulating valve group is corresponding and the situation of change of temperature and pressure are automatically opened or are closed and be arranged on modulating valve corresponding to cold complementary module group, after LNG filling terminates, control system 2 and vision-control system 3 open No. seven modulating valve 57 automatically, liquid nitrogen enters liquid nitrogen storage knock out drum 9 by liquid nitrogen pipes 11, when liquid nitrogen is after the pressure of liquid nitrogen storage knock out drum 9 reaches setting value, control system 2 and vision-control system 3 open No. eight modulating valve 58 automatically, liquid nitrogen is discharged by the emptying mechanism 6 of liquid nitrogen by liquid nitrogen pipes 11, realizes the filling of cold compensation type LNG.

In the cold complementary module group that the present embodiment relates to and modulating valve group, the concrete quantity of cold complementary module and modulating valve is determined by actual demand, because cold complementary module group supplements cold in time in LNG filling process, LNG evaporation in LNG filling process is avoided to produce the situation of BOG completely; The display in real time and regulate the parameter of temperature and pressure in LNG filling process of described control system 2 and vision-control system 3, realize in the controllability of LNG filling process and Security, be applicable to any LNG filing provision, as LNG filling vehicle, occasion such as LNG filling ship and LNG filling station etc.

Claims (1)

1. a cold compensation type liquefied natural gas filling device, is characterized in that agent structure comprises liquid nitrogen storage tank, liquid nitrogen pipes, control system, vision-control system, the first cold complementary module, the second cold complementary module, the 3rd cold complementary module, the 4th cold complementary module, a modulating valve, No. two modulating valve, No. three modulating valve, No. four modulating valve, No. five modulating valve, No. six modulating valve, No. seven modulating valve, No. eight modulating valve, the emptying mechanism of liquid nitrogen, carrying railway carriage, LNG storage tank, LNG pipeline and liquid nitrogen storage knock out drums, first cold complementary module, the second cold complementary module, the 3rd cold complementary module and the 4th cold complementary module series type textural association form cold complementary module group, a modulating valve, No. two modulating valve, No. three modulating valve, No. four modulating valve, No. five modulating valve, No. six modulating valve, No. seven modulating valve and No. eight modulating valve corresponding relevant position combination formation modulating valve group being serially connected with cold complementary module group respectively, liquid nitrogen storage tank is fixedly mounted on the left bottom, inside of carrying railway carriage, the control system of integral structure and vision-control system are arranged on the inside upper left quarter of carrying railway carriage, and cease with each modulating valve telecommunications in modulating valve group respectively and be connected, LNG storage tank is fixedly mounted on the lower right, inside of carrying railway carriage, and liquid nitrogen pipes is fixedly connected with the emptying mechanism of liquid nitrogen with after liquid nitrogen storage knock out drum through the first cold complementary module, carrying railway carriage, the second cold complementary module, the 3rd cold complementary module, the 4th cold complementary module after being stretched out by liquid nitrogen storage tank successively, liquid nitrogen pipes is equipped with a modulating valve between liquid nitrogen storage tank and the first cold complementary module, liquid nitrogen pipes is equipped with No. three modulating valve between the outside of carrying railway carriage and the second cold complementary module, liquid nitrogen pipes is equipped with No. four modulating valve between the second cold complementary module and the 3rd cold complementary module, liquid nitrogen pipes is equipped with No. five modulating valve between the 3rd cold complementary module and the 4th cold complementary module, liquid nitrogen pipes is equipped with No. seven modulating valve between the 4th cold complementary module and liquid nitrogen storage knock out drum, liquid nitrogen pipes is equipped with No. eight modulating valve between liquid nitrogen storage knock out drum and the emptying mechanism of liquid nitrogen, LNG pipeline is connected with the equipment of LNG Liquefied natural gas of need annotating with after the 4th cold complementary module through the first cold complementary module, carrying railway carriage, the second cold complementary module, the 3rd cold complementary module after being stretched out by LNG storage tank successively, LNG pipeline is equipped with No. two modulating valve between LNG storage tank and the first cold complementary module, and LNG pipeline is equipped with No. six modulating valve between the 3rd cold complementary module and the 4th cold complementary module, each modulating valve in control system and vision-control system and modulating valve group respectively telecommunications manner of breathing connects.