CN110159378A - A kind of natural gas overbottom pressure cold energy use system - Google Patents
A kind of natural gas overbottom pressure cold energy use system Download PDFInfo
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- CN110159378A CN110159378A CN201910487337.2A CN201910487337A CN110159378A CN 110159378 A CN110159378 A CN 110159378A CN 201910487337 A CN201910487337 A CN 201910487337A CN 110159378 A CN110159378 A CN 110159378A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/22—Treatment of water, waste water, or sewage by freezing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
- F01B21/00—Combinations of two or more machines or engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
- F01B23/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01B23/10—Adaptations for driving, or combinations with, electric generators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
This application involves the technical field of natural gas pressure regulating more particularly to a kind of natural gas overbottom pressure cold energy use systems.The application includes: the first regulator and the first desalination plant；First regulator includes the first pressure maintaining valve, the first forecooler, thermoregulator, the second pressure maintaining valve, the first expanding machine, the first generator and first heat exchanger；First desalination plant includes filter, the first crystallizer and the first ice storage appts.；Natural gas overbottom pressure cold energy use system provided by the present application can use the overbottom pressure discharged during natural gas pressure regulating and generate electricity, and the cold energy of release will carry out sea water desalination.
Description
Technical field
This application involves the technical field of natural gas pressure regulating more particularly to a kind of natural gas overbottom pressure cold energy use systems.
Background technique
Natural gas has great demand to it as a kind of clean energy resource, China.Natural gas resource is mainly mainly distributed on me
State west area, and the coastal region in east China is bigger to the demand of natural gas.The land conveying of natural gas is mostly defeated by high pressure
Send pipeline.The most of natural gas high pressure gas pipeline pressure in China within the scope of 8Mpa~12Mpa, high-pressure natural gas into
Enter meter pressure to need to first pass through voltage regulating station before 2.5Kpa user's pipe network and carrying out pressure regulation, during pressure regulation, wherein containing huge
Energy level transformation.If distribution pressure is down to 2.5Mpa, the ratio pressure of natural gas from 10MpaLoss is 230KJ/Kg, 2.5Mpa
Natural gas be reduced to during 0.2Mpa-0.4Mpa, pressureLoss is 330KJ/Kg-590KJ/Kg, and 0.2Mpa's is natural
Gas is reduced to during 2.5Kpa,Loss is 167KJ/Kg.If this portion of energy is used, energy benefit will be effectively improved
Use efficiency.It is light to be seldom used in seawater using the forms such as generate electricity and make ice are mainly used for for current natural gas regulation station overbottom pressure
Change.If sea water desalination can be carried out using the natural gas line overbottom pressure of the natural gas regulation station of eastern region, city will be alleviated significantly
Pressure of supply water meets the fundamental policies of national energy conservation and emission reduction, has important economic benefit and social influence.
Summary of the invention
This application provides a kind of natural gas overbottom pressure cold energy use system, generated when allowing to using natural gas pressure regulating
Overbottom pressure alleviates the pressure of supply water in city to sea water desalination.
In view of this, this application provides natural gas overbottom pressure cold energy use system, described device includes:
First regulator and the first desalination plant；
First regulator includes the first pressure maintaining valve, the first forecooler, thermoregulator, the second pressure maintaining valve, first
Expanding machine, the first generator and first heat exchanger；
The gas outlet of upstream high natural gas is connect with the first pressure stabilizing valve pipeline, first pressure maintaining valve and described the
The connection of one expanding machine, first expanding machine are connect with first generator, and first expanding machine and first heat are handed over
The air inlet of parallel operation connects, and the gas outlet of the first heat exchanger is connect with the air inlet of first forecooler, and described the
The gas outlet of one forecooler is connect with second pressure maintaining valve, and the air inlet of second pressure maintaining valve and the thermoregulator connects
It connects, the gas outlet of the thermoregulator is connect with the gas outlet of downstream natural gas；
First desalination plant includes filter, the first crystallizer and the first ice storage appts.；
Sea intake is connect with the inlet of the filter, the liquid outlet of the filter and first forecooler
Inlet connection, the liquid outlet of first forecooler are connect with first crystallizer, the refrigerating medium of first crystallizer
Outlet is connect with the liquid-inlet of the first heat exchanger, the liquid outlet of the first heat exchanger and first crystallization
The refrigerating medium import of device connects, and the ice mouth of first crystallizer is connect with first ice storage appts..
Preferably, the natural gas overbottom pressure cold energy use system, further includes the first water receiver, first ice storage appts.
Ice mouth is connect with first water receiver into ice mouth.
Preferably, the natural gas overbottom pressure cold energy use system, further includes the second regulator and the second sea water desalination
Device；
Second regulator includes the second forecooler, the second expansion unit, the second generating set and the second heat exchange
Device；
The gas outlet of first forecooler connect with the second expansion unit, the second expansion unit and described the
The connection of two generating sets, the second expansion unit are connect with the air inlet of the second heat exchanger, second heat exchange
The gas outlet of device is connect with the air inlet of second forecooler, the gas outlet of second forecooler and second pressure maintaining valve
Connection, second pressure maintaining valve are connect with the air inlet of the thermoregulator, the gas outlet and downstream of the thermoregulator
The gas outlet of natural gas connects；
Second desalination plant includes the second crystallizer and the second ice storage appts.；
The liquid outlet of the filter is connect with the inlet of second forecooler, the liquid outlet of second forecooler
Connect with the inlet of first forecooler, the liquid outlet of first forecooler respectively with first crystallizer and described
The connection of second crystallizer pipeline, the refrigerating medium outlet of second crystallizer and the liquid-inlet of the second heat exchanger connect
It connects, the liquid outlet of the second heat exchanger is connect with the refrigerating medium import of second crystallizer, second crystallizer
Ice mouth connect with second ice storage appts..
Preferably, the natural gas overbottom pressure cold energy use system, further includes the second water receiver, second ice storage appts.
Ice mouth is connect with second water receiver into ice mouth.
Preferably, the second expansion unit includes the first sub- expanding machine and the second sub- expanding machine, first son is swollen
Swollen machine is connected in parallel with the described second sub- expanding machine；
Second generating set include the first sub- generator and the second sub- generator, the first sub- expanding machine with it is described
First sub- generator connection, the second sub- expanding machine are connect with the described second sub- generator.
Preferably, the natural gas overbottom pressure cold energy use system, further includes third regulator and third sea water desalination
Device；
The third regulator includes third forecooler, third expansion unit, third generating set and third heat exchange
Device；
The gas outlet of second forecooler and the third expansion unit connects, the third expansion unit and described the
The connection of three generating sets, the third expansion unit are connect with the air inlet of the third heat exchanger, the third heat exchange
The gas outlet of device is connect with the air inlet of the third forecooler, the gas outlet of the third forecooler and second pressure maintaining valve
Connection, second pressure maintaining valve are connect with the air inlet of the thermoregulator, the gas outlet and downstream of the thermoregulator
The gas outlet of natural gas connects；
The third desalination plant includes third crystallizer and third ice storage appts.；
The liquid outlet of the filter is connect with the inlet of the third forecooler, the liquid outlet of the third forecooler
It is connect with the inlet of second forecooler, the inlet of the liquid outlet of second forecooler and first forecooler connects
It connects, the liquid outlet of first forecooler crystallizes respectively with first crystallizer, described second and the third Crystallizer tube
The refrigerating medium outlet of road connection, the third crystallizer is connect with the liquid-inlet of the third heat exchanger, the third heat
The liquid outlet of exchanger is connect with the refrigerating medium import of the third crystallizer, the ice mouth of the third crystallizer with it is described
The connection of third ice storage appts..
Preferably, the natural gas overbottom pressure cold energy use system, further includes third water receiver, the third ice storage appts.
Ice mouth is connect with the third water receiver into ice mouth.
Preferably, third expansion unit include the sub- expanding machine of third, the 4th sub- expanding machine, the 5th sub- expanding machine and
6th sub- expanding machine, the sub- expanding machine of the third, the 4th sub- expanding machine, the 5th sub- expanding machine and the 6th son are swollen
Swollen machine is connected in parallel；
The third generating set includes the sub- generator of third, the 4th sub- generator, the 5th sub- generator and the 6th son hair
Motor, the sub- expanding machine of third are connect with the sub- generator of the third, and the 4th sub- expanding machine and the 4th son generate electricity
Machine connection, the 5th sub- expanding machine are connect with the 5th sub- generator, and the 6th sub- expanding machine and the 6th son are sent out
Motor connection.
Preferably, first desalination plant is additionally provided with import seawater forecooler；
Sea intake is connect with the inlet of the filter, and the liquid outlet of the filter and the import seawater are pre-chilled
The inlet of device connects, and the liquid outlet of the import seawater forecooler is connect with the inlet of the third forecooler, and described the
The liquid outlet of three forecoolers is connect with the inlet of second forecooler, the liquid outlet of second forecooler and described first
The inlet of forecooler connects.
Preferably, the bottom of first crystallizer, second crystallizer and the third crystallizer be additionally provided with it is dense
Seawater discharge pipe.
As can be seen from the above technical solutions, the embodiment of the present application has the advantage that
In the application, a kind of natural gas overbottom pressure cold energy use system is provided, in use, the outlet of upstream high natural gas
Mouth is connected with the natural gas of high pressure, and high-pressure natural gas becomes pressure by the first pressure maintaining valve and stablizes, after the state of proper temperature, is passed through
Reduce the temperature and pressure of natural gas to the first expanding machine, the pressure difference that high-pressure natural gas generates during pressure regulation makes first
Expanding machine generates mechanical energy, and the mechanical energy of the first expanding machine can pass through the first electrical power generators；Meanwhile passing through the first expanding machine
Natural gas adsorption relative low temperature natural gas, the natural gas of relative low temperature enters in first heat exchanger, the day of relative low temperature
Right gas enters the first forecooler from first heat exchanger output, is then pre-chilled in the first forecooler, then steady by second
Pressure valve, finally by the thermoregulatory effect of thermoregulator, the natural gas that is suitable for by the pressure of proper temperature is from downstream natural gas
Gas outlet is transported to user；At the same time, the refrigerating medium of the relatively-high temperature of the first crystallizer can be input into the first heat by pump and hand over
In parallel operation, so that the natural gas of relative low temperature and the refrigerating medium of relatively-high temperature carry out heat exchange in first heat exchanger, so that
The temperature of refrigerating medium declines, therefore the refrigerating medium of low temperature is back in the first crystallizer from first heat exchanger, is made with refrigerating medium
Indirect type refrigeration is carried out to the first crystallizer for refrigerant；Freezing and crystallizing another side, seawater enter filter from sea intake, filtering
For device by after contaminant filter, seawater sequentially enters the first forecooler, and the first forecooler can carry out heat exchange with seawater and be pre-chilled, with
So that seawater is carried out first time cooling, is conducive to be crystallized in the first crystallizer, then seawater is input into the first crystallizer, low
The refrigerating medium of temperature is input into the outer wall collet of first heat exchanger by pump, and the refrigerating medium of seawater and low temperature carries out indirect heat exchange
Seawater freezing is set to freeze.Seawater congeals into ice, and salinity is discharged other than ice crystal, in the first crystallizer, the refrigerating medium of low temperature
It is increased with the refrigerating medium endothermic temperature of the seawater indirect heat exchange from first heat exchanger, low temperature, seawater heat release icing is attached to
On first crystallizer wall, then flake ice on the wall for being attached to the first crystallizer is scraped by Ice scraping knife, flake ice is scraped
To the first ice storage appts., strong brine is discharged from the first ice storage appts. bottom.The flake ice in the first ice storage appts. is poured at regular intervals
In first water receiver, last flake ice melts in the first water receiver and forms fresh water.Therefore, natural gas overbottom pressure provided by the present application is cold
The overbottom pressure that release during natural gas pressure regulating can be can use using system is generated electricity, and the cold energy of release is by sea water desalination.
Detailed description of the invention
Fig. 1 provides the structure chart of the first natural gas overbottom pressure cold energy use system for the embodiment of the present application；
Fig. 2 provides the structure chart of second of natural gas overbottom pressure cold energy use system for the embodiment of the present application；
Fig. 3 provides the structure chart of the third natural gas overbottom pressure cold energy use system for the embodiment of the present application.
Specific embodiment
It is clearly and completely described below in conjunction with technical solution of the attached drawing to the embodiment of the present application, it is clear that described
Embodiment be the embodiment of the present application a part of the embodiment, instead of all the embodiments.Based on the reality in the embodiment of the present application
Example is applied, every other embodiment obtained by those of ordinary skill in the art without making creative efforts all belongs to
In the range of the embodiment of the present application protection.
In the description of the embodiment of the present application, it should be noted that term " center ", "upper", "lower", "left", "right",
The orientation or positional relationship of the instructions such as "vertical", "horizontal", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings,
It is merely for convenience of description the embodiment of the present application and simplifies description, rather than the device or element of indication or suggestion meaning must have
There is specific orientation, be constructed and operated in a specific orientation, therefore should not be understood as the limitation to the embodiment of the present application.In addition,
Term " first ", " second ", " third " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
In the description of the embodiment of the present application, it should be noted that unless otherwise clearly defined and limited, term " peace
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
The concrete meaning of language in the embodiment of the present application.
It should be understood that the application is applied to the recycling field of overbottom pressure and cold energy when natural gas pressure regulating, referring to Fig. 1, Fig. 1 is
The structure chart of natural gas overbottom pressure cold energy use system in the embodiment of the present application, as shown in Figure 1, including the first regulator in Fig. 1
With the first desalination plant；First regulator is steady including the first pressure maintaining valve 1, the first forecooler 5, thermoregulator 7, second
Pressure valve 6, the first expanding machine 2, the first generator 3 and first heat exchanger 4；The gas outlet A of upstream high natural gas and first is steady
The connection of 1 pipeline of pressure valve, the first pressure maintaining valve 1 are connect with the first expanding machine 2, and the first expanding machine 2 is connect with the first generator 3, and first
Expanding machine 2 is connect with the air inlet of first heat exchanger 4, the air inlet of the gas outlet of first heat exchanger 4 and the first forecooler 5
Connection, the gas outlet of the first forecooler 5 are connect with the second pressure maintaining valve 6, and the air inlet of the second pressure maintaining valve 6 and thermoregulator 7 connects
It connects, the gas outlet of thermoregulator 7 is connect with the gas outlet B of downstream natural gas；First desalination plant include filter 8,
First crystallizer 9 and the first ice storage appts. 10；Sea intake C is connect with the inlet of filter 8, the liquid outlet of filter 8 and
The inlet of one forecooler 5 connects, and the liquid outlet of the first forecooler 5 is connect with the first crystallizer 9, the refrigerating of the first crystallizer 9
Agent outlet is connect with the liquid-inlet of first heat exchanger 4, the load of the liquid outlet of first heat exchanger 4 and the first crystallizer 9
Cryogen import connection, the ice mouth of the first crystallizer 9 are connect with the first ice storage appts. 10.
It should be noted that expanding machine, which is used to export mechanical work outward when the natural gas of high pressure is expanded decompression, makes gas temperature
Spend reduceds principle to obtain the machinery of energy, expanding machine and generator be it is coaxially connected, generator is used to generate expanding machine
Mechanical energy be converted into electric energy.First generator 3 can be connect to power with external cable.
Thermoregulator 7 can be heater or heat exchanger, and thermoregulator 7 is used to high-pressure natural gas passing through first
The temperature for the natural gas being depressured after regulator and the first desalination plant is adjusted, and is allowed to meet the need of downstream user
It asks.
The application devises a kind of natural gas overbottom pressure cold energy use system, in use, the gas outlet A of upstream high natural gas
It is connected with the natural gas of high pressure, high-pressure natural gas becomes pressure by the first pressure maintaining valve 1 and stablizes, after the state of proper temperature, is passed through
Reduce the temperature and pressure of natural gas to the first expanding machine 2, the pressure difference that high-pressure natural gas generates during pressure regulation makes
One expanding machine 2 generates mechanical energy, and the mechanical energy of the first expanding machine 2 can be generated electricity by the first generator 3；Meanwhile passing through first
The natural gas of the natural gas adsorption relative low temperature of expanding machine 2, the natural gas of relative low temperature enter in first heat exchanger 4, relatively
The natural gas of low temperature enters the first forecooler 5 from the output of first heat exchanger 4, then carries out in the first forecooler 5 to seawater
Pre-cooling, then pass through the second pressure maintaining valve 6, finally by the thermoregulatory effect of thermoregulator 7, the day for being suitable for by the pressure of proper temperature
Right gas is transported to user from the gas outlet B of downstream natural gas；At the same time, the refrigerating medium of the relatively-high temperature of the first crystallizer 9 can
To be input into first heat exchanger 4 by pump, so that the refrigerating medium of the natural gas of relative low temperature and relatively-high temperature is handed in the first heat
Heat exchange is carried out in parallel operation 4, so that the temperature of refrigerating medium declines, therefore the refrigerating medium of low temperature is back to from first heat exchanger 4
In first crystallizer 9；Another side, seawater enter filter 8 from sea intake C, and filter 8 is by after contaminant filter, and seawater is successively
Into the first forecooler 5, the first forecooler 5 can carry out heat exchange with seawater and be pre-chilled, so that seawater carries out first time cooling,
Be conducive to be crystallized in the first crystallizer 9, then seawater is input into the first crystallizer 9, and the refrigerating medium of low temperature is defeated by pumping
Into in the outer wall collet of first heat exchanger 4, the refrigerating medium of seawater and low temperature, which carries out indirect heat exchange, makes seawater freezing freeze.Sea
Water-setting build-ups ice, and salinity is discharged other than ice crystal, in the first crystallizer 9, the refrigerating medium of low temperature with come from the first heat exchange
The refrigerating medium endothermic temperature of the seawater indirect heat exchange of device 4, low temperature increases, and seawater heat release icing is attached to 9 wall of the first crystallizer
On, it may then pass through Ice scraping knife and will be attached to flake ice on 9 wall of the first crystallizer and scrape, wherein Ice scraping knife can be built-in
In the inside of the first crystallizer 9, the inside that Ice scraping knife can also reach the first crystallizer 9 by the entrance of the first crystallizer 9 will
Flake ice scrapes, and flake ice is scraped to the first ice storage appts. 10, and the mixture of final flake ice and strong brine is led from the first crystallizer 9 into
In one ice storage appts. 10, the water outlet of the first ice storage appts. 10 is equipped with filter structure, and strong brine is discharged from the strainer of the first ice storage appts. 10.
Finally, the flake ice in the first ice storage appts. 10 is poured into the first water receiver 11 at regular intervals, last flake ice is in the first water receiver
Melt in 11 and forms fresh water.Therefore, natural gas overbottom pressure cold energy use system provided by the present application can use natural gas pressure regulating mistake
The overbottom pressure discharged in journey generates electricity, and the cold energy of release is by sea water desalination.
The embodiment of the present application proposes a kind of using the pressure difference and cold energy that discharge in natural gas pressure reduction, has carried out between phase transformation
Connect the method that fresh water is made in sea water freeze method.It is carried out by the lower natural gas of temperature after refrigerating medium and decompression in First Heat Exchanger
Heat exchange, reduces refrigerant temperature, and low temperature refrigerating medium and seawater carry out heat exchange in the first crystallizer and be frozen into seawater
Flake ice, seawater freeze the flake ice formed on internal surface of crystallizer and disengage it from by Ice scraping knife to fall into the first ice storage appts., finally
Ice collection in first ice storage appts. is melted as fresh water.
It should be noted that refrigerating medium is the cooling that is cooled in evaporator, cooled object then is cooled down with it again, it is this
Intermediate material is known as refrigerating medium.
It should be noted that the first forecooler 5 can be heat exchanger, the natural gas of relative low temperature passes through the first heat exchange
After device 4, then by the air inlet of the first forecooler 5 so that relative low temperature natural gas enters, the gas outlet of the first forecooler 5 so that
Relative low temperature natural gas enters the second expansion unit, and the seawater of relatively-high temperature enters the by the inlet of the first forecooler 5
The seawater of one forecooler, relatively-high temperature leaves the first forecooler from the liquid outlet of the first forecooler 5, and seawater can be in the first pre-cooling
The pre-cooling cooling of first time is carried out in device, the second forecooler 17 of following embodiment and the function of third forecooler 33 and first are in advance
The function of cooler 5 is similar.
Further, the present embodiment further includes the first water receiver 11, the ice mouth and the first water receiver of the first ice storage appts. 10
10 into ice mouth connect.First water receiver 10 to form fresh water and store for melting the flake ice that the first ice storage appts. 10 stores.
In order to make it easy to understand, referring to Fig. 2, Fig. 2 provides second of natural gas overbottom pressure cold energy use for the embodiment of the present application
The structure chart of system, as shown in Fig. 2, the present embodiment further includes the second regulator and the second desalination plant；Second pressure regulation
Device includes the second forecooler 17, second expansion unit, the second generating set and second heat exchanger 16；First forecooler 5
Gas outlet is connect with the second expansion unit, and the second expansion unit is connect with the second generating set, the second expansion unit and the second heat
The air inlet of exchanger 16 connects, and the gas outlet of second heat exchanger 16 is connect with the air inlet of the second forecooler 17, and second is pre-
The gas outlet of cooler 17 is connect with the second pressure maintaining valve 6, and the second pressure maintaining valve 6 is connect with the air inlet of thermoregulator 7, and temperature is adjusted
The gas outlet of device 7 is connect with the gas outlet B of downstream natural gas；Second desalination plant includes the second crystallizer 18 and the second storage
Ice device 19；The liquid outlet of filter 8 is connect with the inlet of the second forecooler 17, and the liquid outlet of the second forecooler 17 and first is in advance
The inlet of cooler 5 connects, and the liquid outlet of the first forecooler 5 is connect with the first crystallizer 9 and the second 18 device pipelines of crystallization respectively,
The refrigerating medium outlet of second crystallizer 18 is connect with the liquid-inlet of second heat exchanger 16, the liquid discharge of second heat exchanger 16
Mouth is connect with the refrigerating medium import of the second crystallizer 18, and the ice mouth of the second crystallizer 18 is connect with the second ice storage appts. 19.
Further the present embodiment further includes the second water receiver 20, the ice mouth of the second ice storage appts. 19 and the second water receiver 20
Into ice mouth connect.
In use, the gas outlet A of upstream high natural gas is connected with the natural gas of high pressure, high-pressure natural gas passes through the first pressure stabilizing
Valve 1 becomes pressure and stablizes, and after the state of proper temperature, being passed into the first expanding machine 2 reduces the temperature and pressure of natural gas, high
The pressure difference that pressure natural gas generates during pressure regulation makes the first expanding machine 2 generate mechanical energy, and the mechanical energy of the first expanding machine 2 can
To be generated electricity by the first generator 3；Meanwhile the natural gas of the natural gas adsorption relative low temperature by the first expanding machine 2, it is relatively low
The natural gas of temperature enters in first heat exchanger 4, and the natural gas of relative low temperature enters the first pre-cooling from the output of first heat exchanger 4
Then device 5 is pre-chilled seawater in the first forecooler 5, then be passed through the second expansion unit, the second expansion unit and the second hair
Motor group is connected to generate electricity, and enters second heat exchanger 16, the day of relative low temperature by the cryogenic natural gas of the second expansion unit
Right gas enters the second forecooler 17 from the output of second heat exchanger 16, and then seawater is pre-chilled in the second forecooler 17,
User is transported to from the gas outlet B of downstream natural gas finally by thermoregulator 7 by the second pressure maintaining valve 6 again；It is same with this
When, the refrigerating medium of the relatively-high temperature of the first crystallizer 9 can be input into first heat exchanger 4 by pump, the second crystallizer 18
The refrigerating medium of relatively-high temperature can be input into second heat exchanger 16 by pump；So that the natural gas and relatively-high temperature of relative low temperature
Refrigerating medium carry out heat exchange in first heat exchanger 4, the natural gas of relative low temperature in second heat exchanger 16 with come from
The refrigerating medium of the relatively-high temperature of second crystallizer 18 carries out heat exchange, so that the refrigerating of the first crystallizer 9 and the second crystallizer 18
The temperature of agent declines；Another side, seawater enter filter 8 from sea intake C, filter 8 by after contaminant filter, seawater successively into
Enter the second forecooler 17 and the first forecooler 5, it can by the natural gas of the second forecooler 17 and the relative low temperature of the first forecooler 5
It is pre-chilled with carrying out heat exchange with seawater, so that seawater carries out first time cooling, is conducive in the first crystallizer 9 and the second crystallization
It is crystallized in device 18, then seawater can be input into simultaneously in the first crystallizer 9 and the second crystallizer 18, and the refrigerating medium of low temperature can
To be input into the outer wall collet of the first crystallizer 9 and the second crystallizer 18 by pump respectively, the refrigerating medium of seawater and low temperature is carried out
Indirect heat exchange makes seawater freezing freeze.Seawater congeals into ice, and salinity is discharged other than ice crystal, in the first crystallizer 9 and
In two crystallizers 18, the refrigerating medium of low temperature and the seawater indirect heat exchange from the first forecooler 5 and the second forecooler 17, low temperature
Refrigerating medium endothermic temperature increases, and seawater heat release icing is adhered to respectively on the wall of the first crystallizer 9 and the second crystallizer 18, then
Flake ice on the wall for being attached to the first crystallizer 9 and the second crystallizer 18 can be scraped by Ice scraping knife, wherein Ice scraping knife can
To be to be built in the inside of the first crystallizer 9 and the second crystallizer 18 to scrape flake ice, Ice scraping knife can also pass through the first crystallization
The entrance of device 9 and the second crystallizer 18 reaches the inside of the first crystallizer 9 and the second crystallizer 18, and flake ice is scraped to the first storage
In ice device 10 and the second ice storage appts. 19, the mixture of final flake ice and strong brine is led from the first crystallizer 9 and the second crystallizer 18
Into in the first ice storage appts. 10 and the second ice storage appts. 19, the water outlet of the first ice storage appts. 10 and the second ice storage appts. 19 is equipped with strainer knot
Structure, strong brine are discharged from the strainer of the first ice storage appts. 10 and the second ice storage appts. 19 respectively.Finally, at regular intervals by the first storage
Flake ice in ice device 10 and the second ice storage appts. 19 is poured into respectively in the first water receiver 11 and the second water receiver 20, and last flake ice is
Melt in one water receiver 11 and the second water receiver 20 and forms fresh water.Therefore, the present embodiment greatly utilizes more than natural gas pressure regulating station
Pressure energy amount carries out sea water desalination by the cold energy that Multi-class propagation gas pressure drop generates, not only increases the effect of sea water desalination
Rate and the natural gas electric energy of expansion work sending in expanding machine are supplied to natural gas regulation station, save the electricity charge for regulation station.
Further, the second expansion unit of the present embodiment includes the first sub- expanding machine 12 and the second sub- expanding machine 13, the
One sub- expanding machine 12 is connected in parallel with the second sub- expanding machine 13；Second generating set includes the first sub- generator 14 and the second son hair
Motor 15, the first sub- expanding machine 12 are connect with the first sub- generator 14, and the second sub- expanding machine 13 is connect with the second sub- generator 15.
Expanding machine and generator be it is coaxially connected, generator is used to convert electric energy for the mechanical energy that expanding machine generates.Generator can be with
It is connect with external cable to power.
In order to make it easy to understand, referring to Fig. 3, Fig. 3 provides the third natural gas overbottom pressure cold energy use for the embodiment of the present application
The structure chart of system, as shown in figure 3, the present embodiment further includes third regulator and third desalination plant；Third pressure regulation
Device includes third forecooler, third expansion unit, third generating set and third heat exchanger 29；Second forecooler 17 goes out
Port is connect with third expansion unit, and third expansion unit is connect with third generating set, and third expands unit and third heat is handed over
The air inlet of parallel operation 29 connects, and the gas outlet of third heat exchanger 29 is connect with the air inlet of third forecooler 33, third pre-cooling
The gas outlet of device 33 is connect with the second pressure maintaining valve 6, and the second pressure maintaining valve 6 is connect with the air inlet of thermoregulator 7, thermoregulator
7 gas outlet is connect with the gas outlet B of downstream natural gas；Third desalination plant includes third crystallizer 30 and third ice storage
Device 31；The liquid outlet of filter 8 is connect with the inlet of third forecooler 33, the liquid outlet of third forecooler 33 and the second pre-cooling
The inlet of device 17 connects, and the liquid outlet of the second forecooler 17 is connect with the inlet of the first forecooler 5, the first forecooler 5
Liquid outlet is connect with the first crystallizer 9, second crystallization 18 and 30 pipeline of third crystallizer respectively, the refrigerating medium of third crystallizer 30
Outlet is connect with the liquid-inlet of third heat exchanger 29, the liquid outlet of third heat exchanger 29 and the load of third crystallizer 30
Cryogen import connection, the ice mouth of the second crystallizer 30 are connect with the second ice storage appts. 31.
In use, the gas outlet A of upstream high natural gas is connected with the natural gas of high pressure, high-pressure natural gas passes through the first pressure stabilizing
Valve 1 becomes pressure and stablizes, and after the state of proper temperature, being passed into the first expanding machine 2 reduces the temperature and pressure of natural gas, high
The pressure difference that pressure natural gas generates during pressure regulation makes the first expanding machine 2 generate mechanical energy, and the mechanical energy of the first expanding machine 2 can
To be generated electricity by the first generator 3；Meanwhile the natural gas of the natural gas adsorption relative low temperature by the first expanding machine 2, it is relatively low
The natural gas of temperature enters in first heat exchanger 4, and the natural gas of relative low temperature enters the first pre-cooling from the output of first heat exchanger 4
Then device 5 is pre-chilled in the first forecooler 5, then be passed through the second expansion unit, the second expansion unit and the second generating set
Connection enters second heat exchanger 16 to generate electricity, by the cryogenic natural gas of the second expansion unit, the natural gas of relative low temperature from
The output of second heat exchanger 16 enters the second forecooler 17, is then pre-chilled in the second forecooler 17, the day of relative low temperature
Right gas is passed through third expansion unit again, and third expansion unit is connect with third generating set to generate electricity, and expands unit by third
Cryogenic natural gas enter third heat exchanger 29, then the natural gas of relative low temperature is transported to third from third heat exchanger 29
Forecooler 33, then use is transported to from the gas outlet B of downstream natural gas finally by thermoregulator 7 by the second pressure maintaining valve 6
Family；At the same time, the refrigerating medium of the relatively-high temperature of the first crystallizer 9 can be input into first heat exchanger 4 by pump, the second knot
The refrigerating medium of the relatively-high temperature of brilliant device 18 can be input into second heat exchanger 16 by pump, the relatively-high temperature of third crystallizer 30
Refrigerating medium can by pump be input into third heat exchanger 29；So that the natural gas of relative low temperature and the refrigerating medium of relatively-high temperature
Heat exchange is carried out in first heat exchanger 4, the natural gas of relative low temperature is in second heat exchanger 16 and from the second crystallization
The refrigerating medium of the relatively-high temperature of device 18 carries out heat exchange, and the natural gas of relative low temperature is in three heat exchangers 29 and from third knot
The refrigerating medium of the relatively-high temperature of brilliant device 30 carries out heat exchange, so that the first crystallizer 9, the second crystallizer 18 and third crystallizer 30
Refrigerating medium temperature decline；Another side, seawater enter filter 8 from sea intake C, and filter 8 is by after contaminant filter, seawater
Third forecooler 33, the second forecooler 17 and the first forecooler 5 are sequentially entered, third forecooler 33, the second forecooler 17 are passed through
Heat exchange can be carried out with seawater with the natural gas of the relative low temperature of the first forecooler 5 and be pre-chilled, so that seawater carries out for the first time
Cooling, is conducive to be crystallized in the first crystallizer 9, the second crystallizer 18 and third crystallizer 30, then seawater can be same
When be input into the first crystallizer 9, the second crystallizer 18 and third crystallizer 30, the refrigerating medium of low temperature can be input by pump respectively
In the outer wall collet of first crystallizer 9, the second crystallizer 18 and third crystallizer 30, the refrigerating medium of seawater and low temperature carries out indirect
Heat exchange makes seawater freezing freeze.Seawater congeals into ice, and salinity is discharged other than ice crystal, crystallizes in the first crystallizer 9, second
In device 18 and third crystallizer 30, the refrigerating medium of low temperature with come from the first forecooler 5, the second forecooler 17 and third forecooler 33
Seawater indirect heat exchange, the refrigerating medium endothermic temperature of low temperature increases, and seawater heat release icing is respectively attached to the first crystallizer 9, the
On the wall of two crystallizers 18 and third crystallizer 30, may then pass through Ice scraping knife will be attached to the first crystallizer 9, the second knot
Flake ice scrapes on wall in brilliant device 18 and third crystallizer 30, wherein Ice scraping knife, which can be, is built in the first crystallizer 9,
The inside of two crystallizers 18 and third crystallizer 30, Ice scraping knife can also pass through the first crystallizer 9, the second crystallizer 18 and third
The inside that the entrance of crystallizer 30 reaches the first crystallizer 9, the second crystallizer 18 and third crystallizer 30 scrapes flake ice, flake ice
It is scraped in the first ice storage appts. 10, the second ice storage appts. 19 and third ice storage appts. 31 respectively, the mixture of final flake ice and strong brine
It leads from the first crystallizer 9, the second crystallizer 18 and third crystallizer 30 into the first ice storage appts. 10, the second ice storage appts. 19 and third and stores up
In ice device 31, the water outlet of the first ice storage appts. 10, the second ice storage appts. 19 and third ice storage appts. 31 is equipped with filter structure, strong brine point
It is not discharged from the strainer of the first ice storage appts. 10, the second ice storage appts. 19 and third water receiver 32.At regular intervals by the first ice storage
Flake ice in device 10, the second ice storage appts. 19 and third ice storage appts. 31 pours into the first water receiver 11, the second water receiver 20 and respectively
In three water receivers 32, last flake ice melts in the first water receiver 11, the second water receiver 20 and third water receiver 32 and forms fresh water.
Therefore, the present embodiment greatly utilizes natural gas pressure regulating station overbottom pressure energy, is generated by Multi-class propagation gas pressure drop cold
It can be carried out sea water desalination, not only increase the efficiency of sea water desalination and the natural gas electric energy that expansion work issues in expanding machine mentions
Natural gas regulation station is supplied, saves the electricity charge for regulation station.
Further, the present embodiment further includes third water receiver 32, the ice mouth and third water receiver 32 of third ice storage appts. 31
Into ice mouth connect.
Further, the third expansion unit of the present embodiment includes the sub- expanding machine 21 of third, the 4th sub- the 22, the 5th son of expanding machine
Expanding machine 23 and the 6th sub- expanding machine 24, the sub- expanding machine 21 of third, the 4th sub- expanding machine 22, the 5th sub- expanding machine 23 and the 6th son
Expanding machine 24 is connected in parallel；Third generating set includes the sub- generator 25 of third, the 4th sub- generator 26, the 5th sub- generator 27
With the 6th sub- generator 28, the sub- expanding machine 21 of third is connect with the sub- generator 25 of third, and the 4th sub- expanding machine 22 and the 4th son are sent out
Motor 26 connects, and the 5th sub- expanding machine 23 is connect with the 5th sub- generator 27, the 6th sub- expanding machine 24 and the 6th sub- generator 28
Connection.
Further, the present embodiment states the first desalination plant and is additionally provided with import seawater forecooler 34；Sea intake C and mistake
The inlet of filter 8 connects, and the liquid outlet of filter 8 is connect with the inlet of import seawater forecooler 34, the pre-cooling of import seawater
The liquid outlet of device 34 is connect with the inlet of third forecooler 33, the liquid outlet of third forecooler 33 and the second forecooler 17 into
The connection of liquid mouth, the liquid outlet of the second forecooler 17 are connect with the inlet of the first forecooler 5.Import seawater forecooler 34 is arranged to use
In the temperature for reducing seawater, so that the seawater after pre-cooling is passing through third forecooler 33, the second forecooler 17 and the respectively
After one forecooler 5, then the first crystallizer 9, the second crystallizer 18 and third crystallizer 30 are respectively enterd, is conducive in the first crystallization
The freezing and crystallizing of device 9, the second crystallizer 18 and third crystallizer 30 improves the desalination efficiency of seawater freezing crystallization.
Further, the bottom of first crystallizer 9 of the present embodiment, the second crystallizer 18 and third crystallizer 30 is additionally provided with dense
Seawater discharge pipe.
In Fig. 1-3, natural gas is entered in the application system by the gas outlet A of upstream high natural gas, and E represents natural gas
Flow direction, be finally transported to downstream user from the gas outlet B of downstream natural gas；C is sea intake, and D is the stream of concentrated seawater
Dynamic direction, F are that the refrigerating medium of the first crystallizer, the second crystallizer and third crystallizer is respectively delivered to first heat exchanger, the
Two heat exchangers and third heat exchanger carry out the flow direction of heat exchange；G be first heat exchanger, second heat exchanger and
Refrigerating medium of the third heat exchanger after heat exchange is respectively delivered to the first crystallizer, the second crystallizer and third crystallizer
Flow direction.
Specifically, Ice scraping knife, Ice scraping knife is arranged in the inside of the first crystallizer 9, the second crystallizer 18 and third crystallizer 30
Set-up mode be existing conventional set-up mode, the water outlet of the first ice storage appts. 10, the second ice storage appts. 19 and third ice storage appts. 31
Mouth is equipped with filter structure, and the set-up mode of strainer is existing conventional set-up mode.
The description of the present application and term " first " in above-mentioned attached drawing, " second ", " third ", " the 4th " etc. are (if deposited
) it is to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that use in this way
Data are interchangeable under appropriate circumstances, so that embodiments herein described herein for example can be in addition to illustrating herein
Or the sequence other than those of description is implemented.In addition, term " includes " and " having " and their any deformation, it is intended that
Cover it is non-exclusive include, for example, containing the process, method, system, product or equipment of a series of steps or units need not limit
In step or unit those of is clearly listed, but may include be not clearly listed or for these process, methods, produce
The other step or units of product or equipment inherently.
It should be appreciated that in this application, " at least one (item) " refers to one or more, and " multiple " refer to two or two
More than a."and/or" indicates may exist three kinds of relationships, for example, " A and/or B " for describing the incidence relation of affiliated partner
It can indicate: only exist A, only exist B and exist simultaneously tri- kinds of situations of A and B, wherein A, B can be odd number or plural number.Word
Symbol "/" typicallys represent the relationship that forward-backward correlation object is a kind of "or"." at least one of following (a) " or its similar expression, refers to
Any combination in these, any combination including individual event (a) or complex item (a).At least one of for example, in a, b or c
(a) can indicate: a, b, c, " a and b ", " a and c ", " b and c ", or " a and b and c ", and wherein a, b, c can be individually, can also
To be multiple.
The above, above embodiments are only to illustrate the technical solution of the application, rather than its limitations；Although referring to before
Embodiment is stated the application is described in detail, those skilled in the art should understand that: it still can be to preceding
Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
It modifies or replaces, the spirit and scope of each embodiment technical solution of the application that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of natural gas overbottom pressure cold energy use system characterized by comprising
First regulator and the first desalination plant；
First regulator includes the first pressure maintaining valve, the first forecooler, thermoregulator, the second pressure maintaining valve, the first expansion
Machine, the first generator and first heat exchanger；
The gas outlet of upstream high natural gas is connect with the first pressure stabilizing valve pipeline, first pressure maintaining valve and described first swollen
Swollen machine connection, first expanding machine are connect with first generator, first expanding machine and the first heat exchanger
Air inlet connection, the gas outlet of the first heat exchanger connect with the air inlet of first forecooler, and described first in advance
The gas outlet of cooler is connect with second pressure maintaining valve, and second pressure maintaining valve is connect with the air inlet of the thermoregulator,
The gas outlet of the thermoregulator is connect with the gas outlet of downstream natural gas；
First desalination plant includes filter, the first crystallizer and the first ice storage appts.；
Sea intake is connect with the inlet of the filter, the feed liquor of the liquid outlet of the filter and first forecooler
Mouth connection, the liquid outlet of first forecooler are connect with first crystallizer, the refrigerating medium outlet of first crystallizer
It is connect with the liquid-inlet of the first heat exchanger, the liquid outlet of the first heat exchanger and first crystallizer
Refrigerating medium import connection, the ice mouth of first crystallizer are connect with first ice storage appts..
2. natural gas overbottom pressure cold energy use system according to claim 1, which is characterized in that it further include the first water receiver,
The ice mouth of first ice storage appts. is connect with first water receiver into ice mouth.
3. natural gas overbottom pressure cold energy use system according to claim 1, which is characterized in that further include the second regulator
With the second desalination plant；
Second regulator includes the second forecooler, the second expansion unit, the second generating set and second heat exchanger；
The gas outlet of first forecooler is connect with the second expansion unit, the second expansion unit and second hair
The connection of motor group, the second expansion unit are connect with the air inlet of the second heat exchanger, the second heat exchanger
Gas outlet is connect with the air inlet of second forecooler, and the gas outlet of second forecooler and second pressure maintaining valve connect
It connects, second pressure maintaining valve is connect with the air inlet of the thermoregulator, the gas outlet and downstream day of the thermoregulator
The gas outlet connection of right gas；
Second desalination plant includes the second crystallizer and the second ice storage appts.；
The liquid outlet of the filter is connect with the inlet of second forecooler, the liquid outlet of second forecooler and institute
State the first forecooler inlet connection, the liquid outlet of first forecooler respectively with first crystallizer and described second
The refrigerating medium outlet of the connection of crystallizer pipeline, second crystallizer is connect with the liquid-inlet of the second heat exchanger, institute
The liquid outlet for stating second heat exchanger is connect with the refrigerating medium import of second crystallizer, and second crystallizer goes out ice
Mouth is connect with second ice storage appts..
4. natural gas overbottom pressure cold energy use system according to claim 3, which is characterized in that it further include the second water receiver,
The ice mouth of second ice storage appts. is connect with second water receiver into ice mouth.
5. natural gas overbottom pressure cold energy use system according to claim 3, which is characterized in that the second expansion unit packet
The first sub- expanding machine and the second sub- expanding machine are included, the first sub- expanding machine is connected in parallel with the described second sub- expanding machine；
Second generating set includes the first sub- generator and the second sub- generator, the first sub- expanding machine and described first
Sub- generator connection, the second sub- expanding machine are connect with the described second sub- generator.
6. natural gas overbottom pressure cold energy use system according to claim 3, which is characterized in that further include third regulator
With third desalination plant；
The third regulator includes third forecooler, third expansion unit, third generating set and third heat exchanger；
The gas outlet of second forecooler is connect with third expansion unit, and the third expansion unit and the third are sent out
The connection of motor group, the third expansion unit are connect with the air inlet of the third heat exchanger, the third heat exchanger
Gas outlet is connect with the air inlet of the third forecooler, and the gas outlet of the third forecooler and second pressure maintaining valve connect
It connects, second pressure maintaining valve is connect with the air inlet of the thermoregulator, the gas outlet and downstream day of the thermoregulator
The gas outlet connection of right gas；
The third desalination plant includes third crystallizer and third ice storage appts.；
The liquid outlet of the filter is connect with the inlet of the third forecooler, the liquid outlet of the third forecooler and institute
The inlet connection of the second forecooler is stated, the liquid outlet of second forecooler is connect with the inlet of first forecooler,
The liquid outlet of first forecooler connects with first crystallizer, second crystallization and the third crystallizer pipeline respectively
It connects, the refrigerating medium outlet of the third crystallizer is connect with the liquid-inlet of the third heat exchanger, the third heat exchange
The liquid outlet of device is connect with the refrigerating medium import of the third crystallizer, the ice mouth of the third crystallizer and the third
Ice storage appts. connection.
7. natural gas overbottom pressure cold energy use system according to claim 6, which is characterized in that it further include third water receiver,
The ice mouth of the third ice storage appts. is connect with the third water receiver into ice mouth.
8. natural gas overbottom pressure cold energy use system according to claim 6, which is characterized in that the third expands unit packet
Include the sub- expanding machine of third, the 4th sub- expanding machine, the 5th sub- expanding machine and the 6th sub- expanding machine, it is the sub- expanding machine of the third, described
4th sub- expanding machine, the 5th sub- expanding machine and the 6th sub- expanding machine are connected in parallel；
The third generating set includes the sub- generator of third, the 4th sub- generator, the 5th sub- generator and the 6th sub- generator,
The sub- expanding machine of third is connect with the sub- generator of the third, and the 4th sub- expanding machine connects with the described 4th sub- generator
It connects, the 5th sub- expanding machine is connect with the 5th sub- generator, the 6th sub- expanding machine and the 6th sub- generator
Connection.
9. natural gas overbottom pressure cold energy use system according to claim 6, which is characterized in that the first sea water desalination dress
It sets and is additionally provided with import seawater forecooler；
Sea intake is connect with the inlet of the filter, the liquid outlet of the filter and the import seawater forecooler
Inlet connection, the liquid outlet of the import seawater forecooler are connect with the inlet of the third forecooler, and the third is pre-
The liquid outlet of cooler is connect with the inlet of second forecooler, the liquid outlet of second forecooler and first pre-cooling
The inlet of device connects.
10. natural gas overbottom pressure cold energy use system according to claim 6, which is characterized in that first crystallizer, institute
The bottom for stating the second crystallizer and the third crystallizer is additionally provided with concentrated seawater discharge pipe.
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Application publication date: 20190823 |