CN103234318A - Demisting and ice-making apparatus and method using liquefied natural gas cold energy - Google Patents
Demisting and ice-making apparatus and method using liquefied natural gas cold energy Download PDFInfo
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Abstract
The invention discloses a demisting and ice-making apparatus and a method using liquefied natural gas cold energy. A liquefied natural gas storage tank of the apparatus is connected with a first heat exchanger by pipeline, and a first heat exchanger is connected by a pipeline gasifier; the first heat exchanger is also respectively connected with a liquid phase low temperature refrigerant storage tank and a gas phase refrigerant storage tank; the liquid phase low temperature refrigerant storage tank is connected with a first centrifugal pump, and the first centrifugal pump is connected with a second heat exchanger by pipeline, and the second heat exchanger is connected with a gas phase refrigerant storage tank by pipeline; the second heat exchanger is also respectively connected with an ice-making machine and a second centrifugal pump by pipeline, and the second centrifugal pump is connected with a glycol storage tank, and the glycol storage tank is connected with the ice-making machine, and the ice-making machine is connected with a water supply line. Two refrigerant circulating systems are designed according to the invention, and the LNG cold energy is used for ice-making, and ice-making quantity and quality are changed according to the invention, thereby saving ice-making and selling power, producing a certain economic benefit, realizing the purpose of energy saving and emission reduction, and clipping peak, demisting and reducing cold pollution in the LNG gasification process.
Description
Technical field
The present invention relates to ice-making technology, particularly relate to a kind of apparatus and method of utilizing cold energy of liquefied natural gas demist ice making.
Background technology
Natural gas is cleaning, high-quality, the energy efficiently, and each state is all greatly developing natural gas at present, to substitute the petroleum resources of shortage.At present, global LNG volume of trade surpasses 1 * 10
8T, and continuing growth.In LNG receiving station, generally all LNG is used by gasifier gasification back, can emit very big cold energy during gasification, its value is 830kJ/kg.If this LNG cold energy effective recycling can be able to be saved the energy, reduces the pollution of LNG vaporescence, is reduced market, downstream air feed price, improve the economic benefit of natural gas.There are 38 LNG receiving stations in the whole world in operation 11 countries and regions at present, and wherein Japan has 23.Present LNG cold energy use mode is cold energy generation, air separation, cold storage warehouse, liquefied carbon dioxide, low-temperature grinding and sewage disposal etc.
Chinese invention patent CN101913604A then discloses a kind of dry ice production devices and methods therefor that utilizes cold energy of liquefied natural gas, this method meets the trend of low-carbon economy, the load of refrigeration plant is greatly reduced, power consumption also is reduced to 30%～40% of traditional liquefaction process, but there is system complex equally, the problem that energy utilization efficiency is low.
The LNG cold energy generation is technology ripe in the LNG cold energy use, Chinese invention patent CN101505122A discloses temperature-difference power generation module of a kind of LNG of utilization cold energy and preparation method thereof, this method adopts complete static thermoelectric material thermo-electric generation mode, easy to use, have much prospect in LNG cold energy thermo-electric generation direction, but this method equipment investment is higher, and thermoelectric conversion efficiency and cold energy use rate remain clearly.Chinese patent CN101245956A is used for expansion power generation, liquefied natural gas self heavy component (such as C with pressure energy of natural gas
2, C
3Deng) and can convert pressure to cold energy and do further to use.This invention can convert pressure to cold energy with lower operating cost, use for cold users such as the freezer of voltage regulating station periphery, cold water air-conditioning, the pulverizing of waste old deep cooling by refrigerant, or make the outward transport of ice cube, dry ice product and sell etc., thereby obtain great economic benefit, improve efficiency of energy utilization.
Chinese invention patent CN201110242169.4 then discloses method and the devices and methods therefor that a kind of cold energy of liquefied natural gas is used for ice making, and this method LNG cold energy use rate height adds the refrigeration power source, energy efficient during ice making; Technological process is simple, and is easy to operate, and control elasticity is bigger; Equipment drops into little, is easy to operation and safeguards that skidization is conducive to the flexible utilization between the different satellite stations, reduces investment risk.
On the one hand, in the LNG gasification, produce a large amount of cold mists, reduce the visibility of air, not only influence gas station staff's normal operation, and can cause tremendous influence to the environment of periphery.From visually, though mist is white in color, the fog sample that scientist gathers is the black that is the ink shape, and its composition is extremely harmful to health.Mist bring large-area disease how also can for some crops, the moist foggy health that also is unfavorable for the people, and what wherein harm was maximum is Modern Traffic, when dense fog occurred in the airport, aircraft just can not landing; When occurring in rivers,lakes and seas or highway, steamer or automobile normal running will be influenced, even traffic accident can be caused.Except influencing traffic, mist can also cause the electric power system fault and can increase the weight of atmospheric pollution level.Therefore, how to adopt correct method to carry out the fog dispersal of LNG gas station and just seem very important.
On the other hand, if the amount of vaporization of LNG gasification station is restricted, equipment can not get reasonable utilization, and it is high to cause LNG cold energy cascade utilization to have equipment cost, and maintenance operation expense height actually is difficult to obtain good economic benefit, even is difficult to recoup capital outlay.And LNG is used for ice making and demist, and the temperature coupling is all proper, and operation is flexible and controllable relatively, reasonable economy is not only arranged, and can reduce the cold pollution of LNG gasification station.
Summary of the invention
The invention provides a kind of cold energy of liquefied natural gas ice making demist technology and device, be used for the ice making of gas station and demist.In the time of the tolerance abundance, by the water yield, the flow of refrigerant and the temperature of gas outlet of control discharge ice machine, reach the purpose of demist; In the time of the tolerance deficiency, control gas outlet temperature is used for ice making with the cold energy in the LNG gasification.
The present invention passes to refrigerant 1 with the cold energy in the liquefied natural gas liquefaction process, refrigerant 1 passes to cold energy refrigerant 2 again then, refrigerant 2 enters ice machine, when the natural gas gasifying peak, pollute for reducing the cold mist of LNG gasification station, need the cold energy in the LNG gasification is transformed rapidly or takes away, cold water is discharged ice machine rapidly; When the natural gas gasifying low ebb, with the cold energy in the LNG gasification all for ice making.The ice of Sheng Chaning just in time satisfies periphery ice needs user like this, is unlikely to overproduction and causes waste, reduces the concentration of cold mist in the LNG gasification station simultaneously, has eliminated cold pollution.
The object of the invention is achieved through the following technical solutions:
A kind of device of cold energy of liquefied natural gas ice making demist comprises LNG tank, first heat exchanger, second heat exchanger, gasifier, liquid phase low temperature refrigerant storage tank, gas phase refrigerant storage tank, ethylene glycol storage tank, ice machine, first centrifugal pump and second centrifugal pump; LNG tank is connected with first heat exchanger by pipeline, and first heat exchanger connects by the pipeline gasifier; First heat exchanger also is connected with the gas phase refrigerant storage tank with liquid phase low temperature refrigerant storage tank respectively; Liquid phase low temperature refrigerant storage tank is connected with first centrifugal pump, and first centrifugal pump is by pipeline and second heat exchanger, and second heat exchanger is connected with the gas phase refrigerant storage tank by pipeline; Second heat exchanger also is connected with second centrifugal pump with ice machine respectively by pipeline, and second centrifugal pump is connected with the ethylene glycol storage tank, and the ethylene glycol storage tank is connected with ice machine, and ice machine connects water supply pipe.
Further, described gasifier is preferably two, is respectively second gasifier and first gasifier, and first heat exchanger is connected with first gasifier with second gasifier respectively by pipeline; Second gasifier and first gasifier are communicated with the downstream gas distributing system respectively.Described first heat exchanger and second heat exchanger adopt shell-and-tube heat exchanger.Described first gasifier and second gasifier all adopt the air temperature type cryogenic gas converter.
A kind of method of utilizing the cold energy of liquefied natural gas ice making demist of said apparatus: 0.3～0.5MPa ,-162～-160 ℃ LNG enter first heat exchanger from LNG tank, LNG and refrigerant R404A heat exchange, temperature rises to-31～-65 ℃, enters the downstream gas distributing system after heating up through second gasifier again; Refrigerant R404A is after the gas phase refrigerant storage tank enters first heat exchanger and LNG heat exchange simultaneously, be reduced to-35～-33 ℃ by-25～-23 ℃, enter second heat exchanger after the cooling, come out with the glycol water heat exchange, temperature raises and return the gas phase refrigerant storage tank after-25～-23 ℃; Glycol water enters second heat exchanger from the ethylene glycol storage tank, after refrigerant R404A heat exchange, the glycol water temperature is reduced to-15～-13 ℃, glycol water enters ice machine after second heat exchanger comes out, absorption is from heat in the running water, and temperature raises and return second heat exchanger and R404A heat exchange after-6～-4 ℃; In the running water input ice machine from grid, with-15～-13 ℃, the heat exchange of 0.2MPa glycol water makes the ice product; LNG is used for ice making with cold energy, realizes cold energy of liquefied natural gas ice making demist.
Further, when the LNG of LNG gasification station amount of vaporization at 5000～20000N m
3During/h, visibility reaches 500～1000m.
With respect to prior art, the invention has the advantages that:
(1) coordinated operation of ice making and demist and suitable parameter adjustment have ensured that not only plant area removes the function of cold mist, and have made ice making function have more flexibility, thereby avoid because the unsalable stock that cause of ice.
(2) adopt two kinds of nonflammable, non-explosive, nontoxic refrigerants to carry out cold transmission and control, make whole cold energy removal process more safe and reliable, system's operating flexibility is big, the ice making defrosting function is more powerful.
(3) equipment investment is few, destroys the formation that the low temperature awkward silence at a meeting stops cold mist by the control temperature, reaches the purpose of demist; And by changing the ice making quality and quantity, the ice making of can economizing on electricity, pin ice produce certain economic benefits, realize the purpose of energy-saving and emission-reduction, again can the peak clipping demist, reduce the cold pollution in the LNG gasification.
Description of drawings
Fig. 1 is the apparatus structure schematic diagram of cold energy of liquefied natural gas ice making demist of the present invention;
Shown in the figure: LNG tank 1, first heat exchanger 2, second heat exchanger 6, second gasifier 3, first gasifier 4, liquid phase low temperature refrigerant storage tank 5, gas phase refrigerant storage tank 7, ethylene glycol storage tank 8, ice machine 9, first centrifugal pump 10, second centrifugal pump 11.
The specific embodiment
For understanding the present invention better, the invention will be further described below in conjunction with drawings and Examples, but the scope of protection of present invention is not limited to the scope of embodiment statement.
As shown in Figure 1, a kind of device of cold energy of liquefied natural gas ice making demist comprises LNG tank 1, first heat exchanger 2, second heat exchanger 6, second gasifier 3, first gasifier 4, liquid phase low temperature refrigerant storage tank 5, gas phase refrigerant storage tank 7, ethylene glycol storage tank 8, ice machine 9, first centrifugal pump 10 and second centrifugal pump 11; LNG tank 1 is connected with first heat exchanger 2 by pipeline, and first heat exchanger 2 is connected with first gasifier 4 with second gasifier 3 respectively by pipeline; First heat exchanger 2 also is connected with gas phase refrigerant storage tank 7 with liquid phase low temperature refrigerant storage tank 5 respectively; Liquid phase low temperature refrigerant storage tank 5 is connected with first centrifugal pump 10, first centrifugal pump 10 by pipeline and second heat exchanger, 6, the second heat exchangers 6 by pipeline be connected; Second heat exchanger 6 also is connected with second centrifugal pump 11 with ice machine 9 respectively by pipeline, and second centrifugal pump 11 is connected with ethylene glycol storage tank 8, and ethylene glycol storage tank 8 is connected with ice machine 9, and ice machine 9 connects water supply pipe; Second gasifier 3 and first gasifier 4 are communicated with the downstream gas distributing system respectively.Use two gasifiers can realize that one opens one fully, so that emergency.First heat exchanger 2, liquid phase low temperature refrigerant storage tank 5, first centrifugal pump 10, second heat exchanger 6, gas phase refrigerant storage tank 7 connect and compose refrigerant circulation circuit one.Second heat exchanger 6, ice machine 9, ethylene glycol storage tank 8 and second centrifugal pump 11 connect and compose refrigerant circulation circuit two.Be provided with refrigerant R404A in the liquid phase low temperature refrigerant storage tank 5; Be provided with normal temperature refrigerant ethylene glycol in the ethylene glycol storage tank 8.
First heat exchanger 2 and second heat exchanger, the 6 preferred shell-and-tube heat exchangers that adopt, LNG walks tube side in first heat exchanger 2, and R404A walks shell side, and LNG passes to refrigerant R404A with cold energy; Refrigerant R404A walks tube side in second heat exchanger 6, and glycol water is walked shell side, and R404A passes to glycol water with cold energy, and glycol water enters ice-maker makes ice.
Natural gas storage tank 1 is used for storing the low-temperature liquefaction natural gas.Refrigerant R404A is in gaseous state before entering first heat exchanger 2, become low temperature liquid phase after the heat exchange, enters liquid phase low temperature refrigerant storage tank 5 then, and liquid phase low temperature refrigerant storage tank 5 plays the current stabilization effect at this to refrigerant, the low temperature refrigerant pump behind the protection storage tank.The liquid R404A of low temperature enters gas phase refrigerant storage tank 7 after entering second heat exchanger and ethylene glycol heat exchange, and gas phase refrigerant storage tank 7 plays gas storage, current stabilization, annotates to such an extent that act at this.Equally, ethylene glycol storage tank 8 plays the effect of liquid storage, current stabilization, filling at the ethylene glycol solution pipeloop, guarantees the stable and balance of ethylene glycol coolant circulating system.Ice machine 9 adopts MB series ice cream machine, and model is MB200, and quantity is preferably 5, makes ice cream weight 30kg, and the type of cooling is water-cooled.
The device of cold energy of liquefied natural gas ice making demist of the present invention comprises two coolant circulating systems and a cover ice-making system.0.3～0.5MPa ,-162～-160 ℃ LNG and refrigerant R404A carry out heat exchange in first heat exchanger 2; Refrigerant R404A and refrigerant glycol water carry out heat exchange in second heat exchanger 6; Refrigerant ethylene glycol water and running water carry out heat exchange in ice machine 9, finish ice making.A kind of method of cold energy of liquefied natural gas demist ice making: 0.3～0.5MPa ,-162～-160 ℃ LNG enter first heat exchanger 2 from LNG tank 1, LNG and refrigerant R404A heat exchange, temperature rises to-31～-65 ℃, enters downstream gas distributing system (first gasifier 4 can be standby) after heating up through second gasifier 3 again.Refrigerant R404A enters first heat exchanger 2 through gas phase refrigerant storage tank 7 simultaneously, be reduced to-35～-33 ℃ by-25～-23 ℃, entering second heat exchanger 6 after the cooling comes out with the glycol water heat exchange, temperature raises and return gas phase refrigerant storage tank 7 after-25～-23 ℃, finishes the heat exchange circulation of refrigerant R404A.Glycol water enters second heat exchanger 6 from ethylene glycol storage tank 8, with the R404A heat exchange, the glycol water temperature is reduced to-15～-13 ℃, after coming out, second heat exchanger 6 enters ice machine 9, absorption is from heat in the running water, temperature raises and return second heat exchanger 6 and R404A heat exchange after-6～-4 ℃, finishes the circulation of refrigerant glycol water.In the running water input ice machine 9 from grid, with-15～-13 ℃, the heat exchange of 0.2MPa glycol water makes the ice product, can regulate the ice cube formation time in ice machine 9, and ice cube is transported after 6～20 hours.
Embodiment 1
Adopting the ice machine of 100 tons/day of ice making capacities as the terminal device that the LNG cold energy discharges, is 9000m at LNG in amount of vaporization
3During/h, its cold discharges the demand that can just satisfy 100 tons of ice makings every day.But by the practical operation situation statistics of gasification station, LNG is 9000～20000Nm in amount of vaporization
3/ h is during the stage, and therefore the cold that every day, gasification discharged in time discharges unnecessary cold beyond the ice making by getting rid of the ice machine inner cold water greater than the required cold of ice of 100 tons of systems, reduces the influence of cold mist when guaranteeing the gasification peak.
-162 ℃, 5000m
3The liquefied natural gas of/h is through the gasifier gasification, and the natural gas that becomes normal temperature enters gas distributing system.Insufficient visibility 12m in 60 minutes gasification stations, the staff can operate, and the residential block around cold mist diffuses to always reduces ambient temperature; Cold mist spreads to highway on every side, and visibility slowly reduces, and traffic is produced minimal effect.
In the present embodiment ,-162 ℃, 0.4MPa, 5000Nm from LNG tank 1, coming out
3The LNG of/h and first heat exchanger 2 carry out heat exchange, and temperature is reduced to-37.8 ℃ and entered then in the second newly-increased gasifier 3, is transported to the downstream gas distributing system.-25 ℃ gas phase R404A and LNG become the low temperature liquid phase under-31.7 ℃, 0.2MPa after 2 heat exchange of first heat exchanger, flow is 14.4t/h, flow in the liquid phase low temperature refrigerant storage tank 5.Be transported in second heat exchanger 6 with the glycol water heat exchange to-25 ℃ through first centrifugal pump 10, enter gas phase refrigerant storage tank 7, finish the circulation of refrigerant R404A.-6 ℃ ethylene glycol storage tank is transported in second heat exchanger 6 through second centrifugal pump 11, becomes-14.6 ℃, 0.2MPa after the heat exchange, and flow is 5t/h, enters ice machine 9, flows back in the ethylene glycol storage tank 8, finishes the circulation of glycol water.20 ℃, 0.2MPa, flow are that the running water of 1.85t/h enters in the ice machine 9, because of the tolerance deficiency (less than 9000Nm
3/ h), all cold energy are all for ice making, and cold energy is used for ice making in the process, after 10 hours, output 100t ice, and cold mist obviously descends in the gas station, 60 minutes visibility 1000m.
Embodiment 2
-162 ℃, 8750m
3The liquefied natural gas of/h is through the gasifier gasification, and the natural gas that becomes normal temperature enters gas distributing system.Insufficient visibility 8m in 60 minutes gasification stations, the staff can operate, and the residential block around cold mist diffuses to always reduces ambient temperature; Cold mist spreads to highway on every side, and visibility slowly reduces, and influences traffic.
-162 ℃, 0.4MPa, 8750m from LNG tank 1, coming out
3The LNG of/h and first heat exchanger 2 carry out heat exchange, and temperature is reduced to-32.1 ℃ and entered then in the second newly-increased gasifier 3, is transported to the downstream gas distributing system.-25 ℃ gas phase R404A and LNG become the low temperature liquid phase under-32.2 ℃, 0.2MPa after 2 heat exchange of first heat exchanger, flow is 25.5t/h, flow in the liquid phase low temperature refrigerant storage tank 5.Be transported in second heat exchanger 6 with the glycol water heat exchange to-25 ℃ through first centrifugal pump 10, enter gas phase refrigerant storage tank 7, finish the circulation of refrigerant R404A.-5.7 ℃ ethylene glycol storage tank is transported in second heat exchanger 6 through second centrifugal pump 11, becomes-14.8 ℃, 0.2MPa after the heat exchange, and flow is 9t/h, enters ice machine 9, flows back in the ethylene glycol storage tank 8, finishes the circulation of glycol water.20 ℃, 0.3MPa, flow are that the running water of 3.5t/h enters in the ice machine 9, because of moderate (the about 9000Nm of tolerance
3/ h), all cold energy are all for ice making, and cold energy is used for ice making in the process, after 6 hours, output 100t ice, and cold mist obviously descends in the gas station, 60 minutes visibility 850m.
-161 ℃, 12500m
3The liquefied natural gas of/h is through the gasifier gasification, and the natural gas that becomes normal temperature enters gas distributing system.Insufficient visibility 6m in 60 minutes gasification stations, the staff can operate reluctantly, and the residential block around cold mist diffuses to always reduces ambient temperature; Cold mist spreads to highway on every side, and visibility reduces greatly, has a strong impact on traffic.
-161 ℃, 0.4MPa, 12500m from LNG tank 1, coming out
3The LNG of/h and first heat exchanger 2 carry out heat exchange, and temperature is reduced to-45.9 ℃ and entered then in the second newly-increased gasifier 3, is transported to the downstream gas distributing system.-23 ℃ gas phase R404A and LNG become the low temperature liquid phase under-35 ℃, 0.2MPa after 2 heat exchange of first heat exchanger, flow is 34.5t/h, flow in the liquid phase low temperature refrigerant storage tank 5.Be transported in second heat exchanger 6 with the glycol water heat exchange to-23 ℃ through first centrifugal pump 10, enter gas phase refrigerant storage tank 7, finish the circulation of refrigerant R404A.-6.8 ℃ ethylene glycol storage tank is transported in second heat exchanger 6 through second centrifugal pump 11, becomes-15.9 ℃, 0.2MPa after the heat exchange, and flow is 15t/h, enters ice machine 9, flows back in the ethylene glycol storage tank 8, finishes the circulation of glycol water.20 ℃, 0.15MPa, flow are that the running water of 5.85t/h enters in the ice machine 9, because of the tolerance abundance (greater than 9000Nm
3/ h), unnecessary cold energy is used for demist, after 8 hours, and output 100t ice, cold mist obviously descends in the gas station, 60 minutes visibility 800m.
-162 ℃, 16250m
3The liquefied natural gas of/h is through the gasifier gasification, and the natural gas that becomes normal temperature enters gas distributing system.Insufficient visibility 2m in 60 minutes gasification stations, the staff can not operate, and the residential block around cold mist diffuses to always reduces ambient temperature; Cold mist spreads to highway on every side, and visibility reduces greatly, has a strong impact on traffic.
-162 ℃, 0.4MPa, 16250m from LNG tank 1, coming out
3The LNG of/h and first heat exchanger 2 carry out heat exchange, and temperature is reduced to-55.8 ℃ and entered then in the second newly-increased gasifier 3, is transported to the downstream gas distributing system.-24.5 ℃ gas phase R404A and LNG become the low temperature liquid phase under-32.8 ℃, 0.2MPa after 2 heat exchange of first heat exchanger, flow is 44.2t/h, flow in the liquid phase low temperature refrigerant storage tank 5.Be transported in second heat exchanger 6 with the glycol water heat exchange to-24.5 ℃ through first centrifugal pump 10, enter gas phase refrigerant storage tank 7, finish the circulation of refrigerant R404A.-6.5 ℃ ethylene glycol storage tank is transported in second heat exchanger 6 through second centrifugal pump 11, becomes-15.9 ℃, 0.2MPa after the heat exchange, and flow is 18t/h, enters ice machine 9, flows back in the ethylene glycol storage tank 8, finishes the circulation of glycol water.20 ℃, 0.2MPa, flow are that the running water of 7.25t/h enters in the ice machine 9, because of the tolerance abundance (greater than 9000Nm
3/ h), unnecessary cold energy is used for demist, after 12 hours, and output 100t ice, and cold mist obviously descends in the gas station, 60 minutes visibility 600m.
Embodiment 5
-160 ℃, 20000m
3The liquefied natural gas of/h is through the gasifier gasification, and the natural gas that becomes normal temperature enters gas distributing system.Insufficient visibility 1m in 60 minutes gasification stations, the staff can't operate fully, and the residential block around cold mist diffuses to always reduces ambient temperature; Cold mist spreads to highway on every side, and visibility reduces greatly, has a strong impact on traffic.
-160 ℃, 0.4MPa, 20000m from LNG tank 1, coming out
3The LNG of/h and first heat exchanger 2 carry out heat exchange, and temperature is reduced to-65.5 ℃ and entered then in the second newly-increased gasifier 3, is transported to the downstream gas distributing system.-23.8 ℃ gas phase R404A and LNG become the low temperature liquid phase under-31.9 ℃, 0.2MPa after 2 heat exchange of first heat exchanger, flow is 51.5t/h, flow in the liquid phase low temperature refrigerant storage tank 5.Be transported in second heat exchanger 6 with the glycol water heat exchange to-23.8 ℃ through first centrifugal pump 10, enter gas phase refrigerant storage tank 7, finish the circulation of refrigerant R404A.-5.4 ℃ ethylene glycol storage tank is transported in second heat exchanger 6 through second centrifugal pump 11, becomes-15.2 ℃, 0.2MPa after the heat exchange, and flow is 19t/h, enters ice machine 9, flows back in the ethylene glycol storage tank 8, finishes the circulation of glycol water.20 ℃, 0.25MPa, flow are that the running water of 7.95t/h enters in the ice machine 9, because of the tolerance abundance (greater than 9000Nm
3/ h), unnecessary cold energy is used for demist, after 15 hours, and output 100t ice, and cold mist obviously descends in the gas station, 60 minutes visibility 500m.
As shown in table 1, in above-described embodiment, the LNG inlet temperature is-162～-160 ℃, and inlet and outlet pressure is 0.4MPa; The R404A inlet temperature remains on-25～-23 ℃, and outlet temperature remains on-35～-33 ℃, and inlet and outlet pressure is 0.2MPa; The inlet temperature of glycol water remains on-7～-5 ℃, and outlet temperature remains on-16～-14 ℃; The inlet temperature of running water remains on 20 ℃, and ice is 0 ℃ in the ice machine, controls its temperature by the flow of control R404A, glycol water and running water.
Table 1
During with the gas low ebb, under the prerequisite of-31～-65 ℃ of control gas outlet temperature controls, reduce running water and enter the discharge of ice machine 9 and the discharge that ice machine 9 is discharged, control glycol water outlet temperature maintains-16～-14 ℃, outlet temperature-35～-33 of control refrigerant R404A ℃.In the control stage, if the outlet temperature of natural gas is difficult to control, need to regulate the flow of the glycol water circulatory system and the R404A circulatory system.
During with the gas peak, under the prerequisite of control gas outlet temperature-31～-65 ℃, increase running water and enter the discharge of ice machine 9 and the discharge that ice machine 9 is discharged, cold energy is shifted rapidly, avoid the formation of a large amount of cold mists.Control glycol water outlet temperature maintains-16～-14 ℃, outlet temperature-35～-33 of control refrigerant R404A ℃.In the control stage, if the outlet temperature of natural gas is difficult to control, need to regulate the flow of the glycol water circulatory system and the R404A circulatory system.
The present invention has not only eliminated the cold mist in the gas station, and the cold energy will be with the gas low ebb time is used for ice making, has reclaimed cold energy, reduces the consumption of electric energy in the electric ice making, has increased economic benefit simultaneously.And apparatus of the present invention flexibility is more intense, and the control ice-making capacity satisfies the demand that periphery is iced the user just, and what be unlikely to ice is unsalable.Realize the peak regulating function of city natural gas pipe network and electrical network and significantly improved the utilization ratio of energy.If get LNG amount of vaporization 5000～20000Nm
3/ h, then system's gross investment is about about 1,000 ten thousand, can economize on electricity about 2,040,000 yuan every year, and annually sells the value that ice produces and be about about 7,200,000 yuan.
Claims (6)
1. the device of a cold energy of liquefied natural gas ice making demist is characterized in that comprising LNG tank, first heat exchanger, second heat exchanger, gasifier, liquid phase low temperature refrigerant storage tank, gas phase refrigerant storage tank, ethylene glycol storage tank, ice machine, first centrifugal pump and second centrifugal pump; LNG tank is connected with first heat exchanger by pipeline, and first heat exchanger connects by the pipeline gasifier; First heat exchanger also is connected with the gas phase refrigerant storage tank with liquid phase low temperature refrigerant storage tank respectively; Liquid phase low temperature refrigerant storage tank is connected with first centrifugal pump, and first centrifugal pump is by pipeline and second heat exchanger, and second heat exchanger is connected with the gas phase refrigerant storage tank by pipeline; Second heat exchanger also is connected with second centrifugal pump with ice machine respectively by pipeline, and second centrifugal pump is connected with the ethylene glycol storage tank, and the ethylene glycol storage tank is connected with ice machine, and ice machine connects water supply pipe.
2. the device of cold energy of liquefied natural gas ice making demist according to claim 1, it is characterized in that: described gasifier is two, be respectively second gasifier and first gasifier, first heat exchanger is connected with first gasifier with second gasifier respectively by pipeline; Second gasifier and first gasifier are communicated with the downstream gas distributing system respectively.
3. the device of cold energy of liquefied natural gas ice making demist according to claim 2, it is characterized in that: described first gasifier and second gasifier all adopt the air temperature type cryogenic gas converter.
4. the device of cold energy of liquefied natural gas ice making demist according to claim 1 is characterized in that: described first heat exchanger and second heat exchanger employing shell-and-tube heat exchanger.
5. method of utilizing the cold energy of liquefied natural gas ice making demist of each described device of claim 1-4, it is characterized in that: 0.3～0.5MPa ,-162～-160 ℃ LNG enter first heat exchanger from LNG tank, LNG and refrigerant R404A heat exchange, temperature rises to-31～-65 ℃, enters the downstream gas distributing system after heating up through second gasifier again; Refrigerant R404A is after the gas phase refrigerant storage tank enters first heat exchanger and LNG heat exchange simultaneously, be reduced to-35～-33 ℃ by-25～-23 ℃, enter second heat exchanger after the cooling, come out with the glycol water heat exchange, temperature raises and return the gas phase refrigerant storage tank after-25～-23 ℃; Glycol water enters second heat exchanger from the ethylene glycol storage tank, after refrigerant R404A heat exchange, the glycol water temperature is reduced to-15～-13 ℃, glycol water enters ice machine after second heat exchanger comes out, absorption is from heat in the running water, and temperature raises and return second heat exchanger and R404A heat exchange after-6～-4 ℃; In the running water input ice machine from grid, with-15～-13 ℃, the heat exchange of 0.2MPa glycol water makes the ice product; LNG is used for ice making with cold energy, realizes cold energy of liquefied natural gas ice making demist.
6. the method for cold energy of liquefied natural gas ice making demist according to claim 5 is characterized in that: when the LNG of LNG gasification station amount of vaporization at 5000～20000Nm
3During/h, visibility reaches 500～1000m.
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