CN203866269U - Natural gas hydrate preparation system adopting compression-type refrigerating cycle - Google Patents
Natural gas hydrate preparation system adopting compression-type refrigerating cycle Download PDFInfo
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- CN203866269U CN203866269U CN201420250315.7U CN201420250315U CN203866269U CN 203866269 U CN203866269 U CN 203866269U CN 201420250315 U CN201420250315 U CN 201420250315U CN 203866269 U CN203866269 U CN 203866269U
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- natural gas
- hydrate
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- sweet natural
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Abstract
The utility model provides a natural gas hydrate preparation system adopting compression-type refrigerating cycle. The natural gas hydrate preparation system is characterized by comprising a gas supply device for supplying natural gas required by the hydration reaction, a refrigeration device communicated with the gas supply device, and used for refrigerating the natural gas and driving the natural gas to flow, and a natural gas hydrate preparation device connected with the refrigeration device and used for preparing natural gas hydrate, wherein the refrigeration device comprises a drier of which inlet end is communicated with the outlet end of the gas supply device, a compressor of which inlet end is communicated with the outlet end of the drier, a cooler of which inlet end is communicated with the outlet end of the compressor, and a throttle valve of which inlet end is communicated with the outlet end of the refrigerator and the outlet end is communicated with the natural gas hydrate preparation device; the drier is used for drying the natural gas; the compressor is used for pumping the natural gas and compressing the natural gas; the cooler is used for reducing the temperature of the natural gas; the throttle valve is used for reducing the temperature of the natural gas through throttling, and sending the temperature-reduced natural gas into the natural gas hydrate preparation device.
Description
Technical field
The utility model relates to the preparation system of gas hydrate, is specifically related to a kind of gas hydrate preparation system that adopts compression-type refrigeration circulation.
Background technology
In recent years, both at home and abroad the systematic study of gas hydrate is shown, the solid-state transport of carrying out Sweet natural gas with hydrate has good DEVELOPMENT PROSPECT.This is mainly reflected in: 1. energy storage density is large, it is reported, and 1m
3gas hydrate (NGH) portability standard state under 150～160m
3sweet natural gas; 2. technology of preparing is simple, and NGH can be below 6MPa, be prepared the link of having avoided very low temperature to prepare compared with natural gas liquids (LNG) under-10～10 DEG C of conditions; 3. the thermophysical property of hydrate is more stable, storage safe, and experiment finds, NGH is at normal pressure ,-1～-18 DEG C time, can stably store and can not decompose; 4. can effectively carry out regasifying of NGH, have two kinds of methods can make decomposition of hydrate: 1. step-down makes its pressure lower than vapor pressure at certain temperature, 2. under certain pressure, heat up and make its temperature higher than Phase Equilibrium Temperature; 5.NGH is easy to carry, and makes NGH be particularly useful for there is no oil-gas field and the offshore oil and gas field of gas pipe line, and is not suitable for economically building the small-sized gas field of gas pipe line; The cost of investment of 6.NGH is lower than LNG, and nineteen ninety-five, the people such as the Gudmundsson of Norway have carried out comparative study to the cost of NGH and LNG form transport natural gas, finds to adopt NGH technology than adopting the gross investment of LNG technology and reduces 26%.Therefore, Chinese scholars generally believes, NGH storaging and transport technology likely substitutes LNG technology becomes one of extensive accumulating means of following Sweet natural gas.
Gas Refrigerator is taking gas as working medium, and the working process of compression type gas refrigerator comprises isoentropic compression, isobaric cooling, isentropic expansion and isobaric heat absorption Four processes, and its feature is that working medium does not collect state and changes in working cycle.Compression type gas refrigeration cycle technology is ripe and be used widely in aircraft air condition, cryogenic refrigeration field.In gas hydrate storaging and transport technology field, the technology of preparing of gas hydrate is increasingly mature, and bubbling style hydrate strengthening growing technology has very strong practical.In this case, exploitation adopts the hydrate continuous preparation device of compression natural gas refrigeration circulation to have very strong technical and economic feasibility and necessity.
Chinese patent CN101358685 is first full of water by the tubular type laminate structure storage tank that is provided with cooling cycle system, then pass into gas to 0.1MPa left and right, discharge unnecessary water, pass into gas pressurization to pressure 5～6MPa, by cooling system control temperature at 0～4 DEG C, gas is contacted with the water in storage tank interior conduit, under static conditions, generate NGH, then cooling, step-down, be chilled to-15～-20 DEG C, sealed storage.NGH storage tank is placed on NGH accumulating automobile (train) tank car that attemperator is installed, NGH is transported to behind point of destination through automobile (train), from outside cooling cycle system, directly pass into temperature higher than the water of 15 DEG C, NGH gasifies very soon; After NGH gasification, remaining water reclaims or recycling.It is slow that the method generates the speed of hydrate under static systems, and cooling cycle system is housed on storage tank, certainly will increase transportation cost.
Japanese Patent JP2005263825A discloses a kind of jetting type hydrate production process and equipment, and liquid is sprayed by ejector through high-pressure pump, sucks Sweet natural gas simultaneously, sprays and enters in reactor, synthetic NGH under the disturbance of whipping appts in reactor after mixing.The method has increased mechanical stirring, inevitably produces heat effect, affects maintaining of the actual formation condition of NGH, and mechanical stirring increases the energy consumption of preparation process, raising preparation cost.
Chinese invention patent 97190182.1 has disclosed a kind of bubble method of perturbation and mechanical mixing method in conjunction with the method for preparing NGH, gas impacts water from container bottom through nozzle ejection and forms bubble disturbance, be arranged on the agitator in container by driven by motor, increase the contact area of gas and water, accelerate the generation of NGH.Aforesaid method still needs to use mechanical stirring, has increased the energy consumption in production process; And the method use water coolant refrigeration, need optional equipment chilled water unit.
Deficiency in above-mentioned NGH synthetic technology has greatly hindered its application on Sweet natural gas storaging and transport technology.Domestic NGH synthetic technology is also very immature, also has many technical problems to research and solve, and makes it cannot commercial applications.
Utility model content
The utility model carries out for above-mentioned problem, and it is a kind of simple in structure that object is to provide, without being equipped with special mechanical stirring device and the gas hydrate preparation system of refrigeration plant.
The utility model for achieving the above object, has adopted following technical scheme:
The utility model provides a kind of gas hydrate preparation system that adopts compression-type refrigeration circulation, it is characterized in that, comprising: air feeder, for hydration reaction provides required Sweet natural gas; Refrigeration plant, is connected with air feeder, to Sweet natural gas carry out cooling and drive Sweet natural gas flow; And gas hydrate preparation facilities, be connected with refrigeration plant, for the preparation of gas hydrate, wherein, refrigeration plant comprises: inlet end is connected with the exit end of air feeder, and Sweet natural gas is carried out to dry moisture eliminator; Inlet end is connected with the exit end of moisture eliminator, for aspirating Sweet natural gas, and the compressor that Sweet natural gas is compressed; Inlet end is connected with the exit end of compressor, makes the water cooler of Sweet natural gas cooling; And inlet end is connected with the exit end of water cooler, exit end is connected with gas hydrate preparation facilities, make described Sweet natural gas cooling by throttling, and the Sweet natural gas after cooling is sent into the throttling valve of gas hydrate preparation facilities, gas hydrate preparation facilities comprises: for hydration reaction provides the water unit of required water; Be connected with the exit end of this water unit and the exit end of throttling valve, generate the bubbling style hydrate reaction still of gas hydrate for making natural G&W carry out hydration reaction; The recycle pump that inlet end is connected with this bubbling style hydrate reaction still; And the dehydration holder being connected with the exit end of recycle pump, bubbling style hydrate reaction still has body; Be positioned at body bottom, the air flow inlet being connected with the exit end of throttling valve; Be positioned at bodies top, be connected with the inlet end of moisture eliminator, for discharging the air stream outlet of the remaining Sweet natural gas of hydration reaction; Be positioned at the below, side of body, the first water inlet being connected with the exit end of water pump; Be positioned at the below, side of body, the second water inlet being connected with dehydration holder; Be positioned at the top, side of body, the hydrate being connected with the inlet end of recycle pump outlet; And be arranged on the bottom of body, and be positioned at the top of air flow inlet, for the orifice plate of mean air flow, dehydration holder separates gas hydrate with the natural G&W of carrying secretly, and for storing the gas hydrate after separation, there is the porous sieve plate main body of multilayer; Be positioned at main body top, be connected with the inlet end of moisture eliminator, for discharging the air outlet of isolated Sweet natural gas; Be positioned at the top, side of main body, the hydrate entrance being connected with the exit end of recycle pump; And be positioned at below the side of main body, be connected with the second water inlet of bubbling style hydrate reaction still, isolated water is imported to the water outlet of hydrate reaction still.
The effect of utility model and effect
The gas hydrate preparation system that the related employing compression-type refrigeration of the utility model circulates, because adopt compressor to drive Sweet natural gas repeatedly to pass through bubbling style hydrate reaction still, adopt bubbling style hydrate reaction still to prepare gas hydrate, and the air-flow of the average Sweet natural gas of orifice plate is set, natural G&W is fully contacted, the formation speed that therefore can effectively increase gas hydrate, makes hydration reaction more thorough, without preparing in addition mechanical disturbance equipment.
In addition, because adopt water cooler and throttling valve to make to enter bubbling style hydrate reaction still after Sweet natural gas decrease temperature and pressure, the Sweet natural gas of low temperature can be lowered the temperature and absorb hydration reaction heat bubbling style hydrate reaction still, therefore this preparation system is without being equipped with chilled water unit, unnecessary Sweet natural gas is siphoned away and increasing temperature and pressure by compressor, then after decrease temperature and pressure, again enter bubbling style hydrate reaction still and carry out hydration reaction, realize the refrigeration cycle of Sweet natural gas and make full use of.
This gas hydrate preparation system can be for preparing continuously, in large quantities gas hydrate, and without being equipped with in addition special refrigeration plant and mechanical disturbance device, simple in structure, there is good engineering applicability.
Brief description of the drawings
Fig. 1 is the structured flowchart of gas hydrate preparation system; With
Fig. 2 is the structural representation of gas hydrate preparation system.
Embodiment
Below in conjunction with accompanying drawing, the gas hydrate preparation system of the related employing compression-type refrigeration circulation of the utility model is elaborated.
Embodiment
Fig. 1 is the structured flowchart of gas hydrate preparation system.
As shown in Figure 1, gas hydrate preparation system 10 comprises air feeder 11, refrigeration plant 12 and gas hydrate preparation facilities 13.
Fig. 2 is the structural representation of gas hydrate preparation system.
Air feeder 11 is used to hydration reaction that required Sweet natural gas is provided.As shown in Figure 2, air feeder 11 comprises natural gas steel cylinder 14 and valve 15.Valve 15 is connected with the air outlet of natural gas steel cylinder 14.
Refrigeration plant 12 is cooling for Sweet natural gas is carried out, and drives flowing of Sweet natural gas.As shown in Figure 1, 2, refrigeration plant 12 comprises moisture eliminator 16, compressor 17, water cooler 18 and throttling valve 19.
The inlet end of moisture eliminator 16 is connected with valve 15, and exit end is connected with the inlet end of compressor 17.The exit end of compressor 17 is connected with the inlet end of water cooler 18.The exit end of water cooler 18 is connected with the inlet end of throttling valve 19.The exit end of throttling valve 19 is connected with gas hydrate preparation facilities 13.
Gas hydrate preparation facilities 13 is for making natural G&W generation hydration reaction prepare gas hydrate.As shown in Figure 1, 2, gas hydrate preparation facilities 13 comprises water unit 20, bubbling style hydrate reaction still 21, recycle pump 22 and dehydration holder 23.
Water unit 20, for providing hydration reaction required water, comprises tank 24 and water pump 25, and water pump 25 is connected with bubbling style hydrate reaction still 21 with tank 24 respectively, by the water suction bubbling style hydrate reaction still 21 in tank 24.
Bubbling style hydrate reaction still 22, for the preparation of gas hydrate, comprises body 26, air flow inlet 27, air stream outlet 28, the first water inlet 29, the second water inlet 30, hydrate outlet 31 and orifice plate 32.Air flow inlet 27 is positioned at the bottom of body 26, is connected with the exit end of throttling valve 19.Air stream outlet 28 is positioned at the top of body 26, is connected with the inlet end of moisture eliminator 16.The first water inlet 29 is positioned at the below, side of body 26, is connected with water pump 25.The second water inlet 30 is also positioned at the below, side of body 26, is connected with dehydration holder 23.Hydrate outlet 31 is positioned at the top, side of body 26, is connected with the inlet end of recycle pump 22.Orifice plate 32 is arranged on the bottom of body 26, is positioned at the top of air flow inlet 27.
Recycle pump 22 enters dehydration holder 23 for the gas hydrate suction that bubbling style hydrate reaction still 21 is generated.The inlet end of recycle pump 22 is connected with hydrate outlet 31, and exit end is connected with dehydration holder 23.
Dehydration holder 23 is dried for the gas hydrate that bubbling style hydrate reaction still 21 is generated, and separates the Sweet natural gas of carrying secretly, and separates dried gas hydrate for storing.Dehydration holder 23 has main body 33, hydrate entrance 34, air outlet 35 and water outlet 36.Hydrate entrance 34 is positioned at the top, side of main body 33, is connected with the exit end of recycle pump 22.Air outlet 35 is positioned at the top of main body 33, is connected with the inlet end of moisture eliminator 16.Water outlet 36 is positioned at the below, side of main body 33, is connected with the second water inlet 30 of bubbling style hydrate reaction still 21.
In the working process of gas hydrate preparation system 10, first operator opens water pump 25, the water in suction tank 24, and the water in tank 24 enters bubbling style hydrate reaction still 24 by the first water inlet 29.Open compressor 17 and throttling valve 19, make the temperature of the working solution in bubbling style hydrate reaction still 21 remain on 3 DEG C, pressure remains on 0.3～1MPa.Open valve 15, make the Sweet natural gas in natural gas steel cylinder 14 enter moisture eliminator 16, after natural gas via is dry, enter compressor 17, in compressor 17, be compressed into high temperature and high pressure gas, the Sweet natural gas of High Temperature High Pressure enters water cooler 18, is cooled into the Sweet natural gas of cryogenic high pressure, then enters throttling valve 19, the Sweet natural gas of cryogenic high pressure is expended energy under the throttling action of throttling valve 19, becomes low-temp low-pressure gas.
The natural gas via air flow inlet 27 of low-temp low-pressure enters bubbling style hydrate reaction still 21, wherein a part of cryogenic natural gas heat absorption heats up, water temp in bubbling style hydrate reaction still 21 is reduced, the Sweet natural gas of another part low temperature mixes and just can generate gas hydrate slurry mutually with the water after cooling, hydration reaction heat is absorbed by cryogenic natural gas and cryogenic natural gas is heated up, orifice plate 32 is more on average stablized the gas flow flowing into from air flow inlet 27, thereby Sweet natural gas is fully contacted with the water in bubbling style hydrate reaction still 21, improve the generating rate of hydrate.The Sweet natural gas that has neither part nor lot in hydration reaction is siphoned away by compressor 17, flow out from the air stream outlet 28 at bubbling style hydrate reaction still 21 tops, enter moisture eliminator 16, then enter respectively compressor 17, water cooler 18 and throttling valve 19, after again becoming low-temp low-pressure gas, enter bubbling style hydrate reaction still 21 by air flow inlet 27 and orifice plate 32, thereby realize the recycle of Sweet natural gas.
The gas hydrate slurry generating in bubbling style hydrate reaction still 21 floats over the upper strata of working solution, adopts recycle pump 22 that gas hydrate slurry is extracted out from hydrate outlet 31, enters dehydration holder 23 by hydrate entrance 34.The main body 33 of dehydration holder 23 is porous sieve plate structures of multilayer, and gas hydrate slurry enters after dehydration holder 23, and the Sweet natural gas of wherein carrying secretly, under the suction function of compressor 17, flows out and enters moisture eliminator 16 from air outlet 35, thus recycle again; Water in gas hydrate slurry, by sieve plate filtering, flows out from water outlet 36, and flows into bubbling style hydrate reaction still 21 by the second water inlet 30, carries out recycle; Solid-state gas hydrate are stayed on the sieve plate of multilayer, are stored in dehydration holder 23.
The effect of embodiment and effect
The gas hydrate preparation system that the related employing compression-type refrigeration of the present embodiment circulates, adopt compressor 17 to drive Sweet natural gas repeatedly to pass through the working solution in bubbling style hydrate reaction still 21, and in bubbling style hydrate reaction still 21 bottoms, the orifice plate 32 for mean air flow is installed, Sweet natural gas is fully contacted with water, with recycle pump 22 by generate gas hydrate slurry extract out, therefore, in bubbling style gas hydrate reactor 21, can generate continuously, rapidly gas hydrate, without the mechanical disturbance equipment of configure dedicated.
In addition, because adopt compressor 17, water cooler 18 and throttling valve 19 to make Sweet natural gas decrease temperature and pressure, the Sweet natural gas of low temperature enters after bubbling style hydrate reaction still 21, can absorb hydration reaction heat, the water in bubbling style hydrate reaction still 21 is lowered the temperature, therefore.In bubbling style hydrate reaction still 21, can generate continuously gas hydrate, without the refrigeration plant of configure dedicated.
In addition, in bubbling style hydrate reaction still 21, have neither part nor lot in the Sweet natural gas of hydration reaction, all be pumped to refrigeration plant 12 by compressor 17 with the Sweet natural gas separating in dehydration holder 23 from gas hydrate slurry, after the Sweet natural gas of formation low-temp low-pressure, again enter in bubbling style hydrate reaction still 21 and participate in hydration reaction, therefore, refrigeration plant 12 has been realized the refrigeration cycle of Sweet natural gas, and Sweet natural gas is fully used.
Certainly; the gas hydrate preparation system that the related employing compression-type refrigeration of the utility model circulates is not merely defined in the structure described in above embodiment; these are only the basic explanation under the utility model design; and any equivalent transformation of doing according to the technical solution of the utility model all should belong to protection domain of the present utility model.
Claims (1)
1. a gas hydrate preparation system that adopts compression-type refrigeration circulation, is characterized in that, comprising:
Air feeder, for hydration reaction provides required Sweet natural gas;
Refrigeration plant, is connected with described air feeder, to described Sweet natural gas carry out cooling and drive described Sweet natural gas flow; And
Gas hydrate preparation facilities, is connected with described refrigeration plant, for the preparation of gas hydrate,
Wherein, described refrigeration plant comprises: inlet end is connected with the exit end of described air feeder, and described Sweet natural gas is carried out to dry moisture eliminator; Inlet end is connected with the exit end of described moisture eliminator, for aspirating described Sweet natural gas, and the compressor that described Sweet natural gas is compressed; Inlet end is connected with the exit end of described compressor, makes the water cooler of described Sweet natural gas cooling; And inlet end is connected with the exit end of described water cooler, exit end is connected with described gas hydrate preparation facilities, makes described Sweet natural gas cooling by throttling, and the Sweet natural gas after cooling is sent into the throttling valve of described gas hydrate preparation facilities,
Described gas hydrate preparation facilities comprises: for described hydration reaction provides the water unit of required water; Be connected with the exit end of this water unit and the exit end of described throttling valve, generate the bubbling style hydrate reaction still of described gas hydrate for making described Sweet natural gas and described water carry out described hydration reaction; The recycle pump that inlet end is connected with this bubbling style hydrate reaction still; And the dehydration holder being connected with the exit end of described recycle pump,
Described bubbling style hydrate reaction still has body; Be positioned at described body bottom, the air flow inlet being connected with the described exit end of described throttling valve; Be positioned at described bodies top, be connected with the described inlet end of described moisture eliminator, for discharging the air stream outlet of the remaining Sweet natural gas of described hydration reaction; Be positioned at the below, side of described body, the first water inlet being connected with the described exit end of described water pump; Be positioned at the below, side of described body, the second water inlet being connected with described dehydration holder; Be positioned at the top, side of described body, the hydrate being connected with the described inlet end of described recycle pump outlet; And be arranged on the bottom of described body, and be positioned at the top of described air flow inlet, for the orifice plate of mean air flow,
Described dehydration holder separates described gas hydrate with the natural G&W of carrying secretly, and for storing the gas hydrate after separation, has the porous sieve plate main body of multilayer; Be positioned at described main body top, be connected with the described inlet end of described moisture eliminator, for discharging the air outlet of isolated described Sweet natural gas; Be positioned at the top, side of described main body, the hydrate entrance being connected with the described exit end of described recycle pump; And be positioned at below the side of described main body, be connected with described second water inlet of described bubbling style hydrate reaction still, isolated described water is imported to the water outlet of described hydrate reaction still.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105733722A (en) * | 2016-05-03 | 2016-07-06 | 西南石油大学 | Liquid removing device of gas circulation loop and liquid removing method of liquid removing device |
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2014
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105733722A (en) * | 2016-05-03 | 2016-07-06 | 西南石油大学 | Liquid removing device of gas circulation loop and liquid removing method of liquid removing device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141008 Termination date: 20150516 |
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| EXPY | Termination of patent right or utility model |