CN103234318B - A kind of apparatus and method utilizing cold energy of liquefied natural gas demist ice making - Google Patents
A kind of apparatus and method utilizing cold energy of liquefied natural gas demist ice making Download PDFInfo
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Abstract
The invention discloses a kind of apparatus and method utilizing cold energy of liquefied natural gas demist ice making.The LNG tank of this device is connected with First Heat Exchanger by pipeline, and First Heat Exchanger is connected by pipeline gasifier; First Heat Exchanger is also connected with liquid phase low temperature coolant storage tank and gas phase coolant storage tank respectively; Liquid phase low temperature coolant storage tank is connected with the first centrifugal pump, and the first centrifugal pump is by pipeline and the second heat exchanger, and the second heat exchanger is connected with gas phase refrigerant storage tank by pipeline; Second heat exchanger is also connected with ice machine and the second centrifugal pump respectively by pipeline, and the second centrifugal pump is connected with ethylene glycol storage tank, and ethylene glycol storage tank is connected with ice machine, and ice machine connects water supply pipe.The present invention devises two coolant circulating systems, and the cold energy of LNG is used for ice making, by changing ice making quality and quantity, can be economized on electricity ice making, pin ice, produces certain economic benefit, realize the object of energy-saving and emission-reduction, again can peak clipping demist, reduce the cold pollution in LNG gasification.
Description
Technical field
The present invention relates to ice-making technology, particularly relate to a kind of apparatus and method utilizing cold energy of liquefied natural gas demist ice making.
Background technology
Natural gas be clean, high-quality, the efficiently energy, current each state is all greatly developing natural gas, with the petroleum resources of alternative shortage.At present, global LNG volume of trade is more than 1 × 10
8t, and increase in continuation.In LNG receiving station, generally all used by gasifier gasification is rear by LNG, can release very large cold energy during gasification, its value is 830kJ/kg.If by this LNG cold energy effective recycling, the energy can be saved, reduce the pollution of LNG vaporescence, reduce Downstream Market air feed price, improve the economic benefit of natural gas.There are 38 LNG receiving stations in the current whole world in operation 11 countries and regions, 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 CN 101913604A then discloses a kind of dry ice production devices and methods therefor utilizing cold energy of liquefied natural gas, the method meets the trend of low-carbon economy, the load of refrigeration plant is greatly reduced, power consumption is also reduced to 30% ~ 40% of traditional liquefaction process, but there is system complex equally, the problem that energy utilization efficiency is low.
LNG cold energy generation is technique more ripe in LNG cold energy use, Chinese invention patent CN 101505122A discloses and a kind ofly utilizes temperature-difference power generation module of LNG cold energy and preparation method thereof, the method adopts complete static thermoelectric material thermo-electric generation mode, easy to use, prospect is had much in LNG cold energy thermo-electric generation direction, but the method equipment investment is higher, thermoelectric conversion efficiency and cold energy use rate need clearly.Pressure energy of natural gas is used for expansion power generation, liquefied natural gas self heavy component (such as C by Chinese patent CN 101245956A
2, C
3deng) and pressure energy is converted to the application further of cold energy do.This invention converts pressure energy to cold energy with lower operating cost, by the cold user such as freezer, cooling water air conditioner, waste old deep cooling crush of refrigerant for voltage regulating station periphery, or make ice cube, dry ice product outward transport sale etc., thus obtain great economic benefit, improve efficiency of energy utilization.
Chinese invention patent CN 201110242169.4 discloses a kind of cold energy of liquefied natural gas for the method for ice making and devices and methods therefor, and the method LNG cold energy use rate is high, additional refrigeration power source during ice making, saves energy consumption; Technological process is simple, easy to operate, controls elasticity larger; Equipment investment is little, is easy to operation and maintenance, and skid is conducive to the flexible utilization between different satellite station, reduces investment risk.
On the one hand, in LNG gasification, produce a large amount of cold mist, reduce the visibility of air, not only affect the normal operation of gas station staff, and tremendous influence can be caused to the environment of periphery.Visually, though mist is in white, the fog sample that scientist gathers is the black in ink shape, and its composition is extremely harmful to health.Mist is many bring large-area disease, the moist foggy health being also unfavorable for people also can to some crops, and wherein endangering maximum is Modern Traffic, and when dense fog occurs in airport, aircraft just can not landing; When occurring in rivers,lakes and seas or highway, steamer or automobile normal running will be affected, even can cause traffic accident.Except affecting traffic, mist can also cause electric power system fault and can increase the weight of atmospheric pollution level.Therefore, how to adopt on sound lines carry out LNG gas station fog dispersal just seem very important.
On the other hand, if the amount of vaporization of LNG gasification station is restricted, equipment can not get Appropriate application, LNG cold energy cascade utilization will be caused to have equipment cost high, and costly, actual being difficult to obtains good economic benefits to maintenance operation, is even difficult to recoup capital outlay.And LNG being used for ice making and demist, Temperature Matching is all proper, operates more controlled, not only has reasonable economy, 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 technique and device, for the ice making of gas station and demist.When tolerance abundance time, by controlling the temperature of discharging the water yield of ice machine, the flow of refrigerant and gas outlet, reach the object of demist; When tolerance deficiency time, control gas outlet temperature, the cold energy in LNG gasification is used for ice making.
Cold energy in liquefied natural gas liquefaction process is passed to refrigerant 1 by the present invention, then cold energy is passed to refrigerant 2 again by refrigerant 1, refrigerant 2 enters ice machine, when natural gas gasifying peak, pollute for reducing the cold mist of LNG gasification station, cold energy in LNG gasification need be transformed rapidly or take away, cold water is discharged ice machine rapidly; When natural gas gasifying low ebb, the cold energy in LNG gasification is all used for ice making.The ice of such production just in time meets periphery ice needs user, is unlikely to overproduction and causes waste, reduces the concentration of cold mist in LNG gasification station simultaneously, eliminates cold pollution.
The object of the invention is achieved through the following technical solutions:
A device for cold energy of liquefied natural gas ice making demist, comprises LNG tank, First Heat Exchanger, the second heat exchanger, gasifier, liquid phase low temperature coolant storage tank, gas phase refrigerant storage tank, ethylene glycol storage tank, ice machine, the first centrifugal pump and the second centrifugal pump; LNG tank is connected with First Heat Exchanger by pipeline, and First Heat Exchanger is connected with gasifier by pipeline; First Heat Exchanger is also connected with liquid phase low temperature coolant storage tank and gas phase coolant storage tank respectively; Liquid phase low temperature coolant storage tank is connected with the first centrifugal pump, and the first centrifugal pump is connected with the second heat exchanger by pipeline, and the second heat exchanger is connected with gas phase refrigerant storage tank by pipeline; Second heat exchanger is also connected with ice machine and the second centrifugal pump respectively by pipeline, and the second centrifugal pump is connected with ethylene glycol storage tank, and ethylene glycol storage tank is connected with ice machine, and ice machine connects water supply pipe.
Further, described gasifier is preferably two, and be the second gasifier and the first gasifier respectively, First Heat Exchanger is connected with the second gasifier and the first gasifier respectively by pipeline; Second gasifier is communicated with downstream gas distributing system respectively with the first gasifier.Described First Heat Exchanger and the second heat exchanger adopt shell-and-tube heat exchanger.Described first gasifier and the second gasifier all adopt air temperature type cryogenic gas converter.
A kind ofly utilize the method for the cold energy of liquefied natural gas ice making demist of said apparatus: 0.3 ~ 0.5MPa, the LNG of-162 ~-160 DEG C enter First Heat Exchanger from LNG tank, LNG and refrigerant R404A heat exchange, temperature rises to-31 ~-65 DEG C, then enters downstream gas distributing system after the second gasifier heats up; Refrigerant R404A enters after First Heat Exchanger and LNG heat exchange through gas phase refrigerant storage tank simultaneously,-35 ~-33 DEG C are reduced to by-25 ~-23 DEG C, enter the second heat exchanger after cooling, with glycol water heat exchange out, temperature raises as returning gas phase refrigerant storage tank after-25 ~-23 DEG C; Glycol water enters the second heat exchanger from ethylene glycol storage tank, after refrigerant R404A heat exchange, glycol water temperature is reduced to-15 ~-13 DEG C, glycol water out enters ice machine afterwards from the second heat exchanger, absorb from heat in running water, temperature raises and return the second heat exchanger and R404A heat exchange after-6 ~-4 DEG C; From in the running water input ice machine of grid, with-15 ~-13 DEG C, the heat exchange of 0.2MPa glycol water, obtained ice product; Cold energy is used for ice making by LNG, realizes cold energy of liquefied natural gas ice making demist.
Further, when the LNG amount of vaporization of LNG gasification station is at 5000 ~ 20000N m
3during/h, visibility reaches 500 ~ 1000m.
Relative to prior art, the invention has the advantages that:
(1) coordinated operation of ice making and demist and suitable parameter adjustment, not only ensured that the function of cold mist is removed by plant area, and made ice making function have more flexibility, thus avoid the stock that cause because ice is unsalable.
(2) refrigerant that employing two kinds is nonflammable, non-explosive, nontoxic carries out cold transmission and control, makes whole cold energy removal process more safe and reliable, and Dynamic System elasticity is large, ice making defrosting function is more powerful.
(3) equipment investment is few, is stoped the formation of cold mist, reach the object of demist by control temperature destruction low temperature awkward silence at a meeting; And by changing ice making quality and quantity, ice making of can economizing on electricity, pin ice, produce certain economic benefit, realize the object of energy-saving and emission-reduction, again can peak clipping demist, reduce the cold pollution in LNG gasification.
Accompanying drawing explanation
Fig. 1 is the apparatus structure schematic diagram of cold energy of liquefied natural gas ice making demist of the present invention;
Shown in figure: LNG tank 1, First Heat Exchanger 2, second heat exchanger 6, second gasifier 3, first gasifier 4, liquid phase low temperature coolant 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.
Detailed description of the invention
For understanding the present invention better, below in conjunction with drawings and Examples, the invention will be further described, but the scope of protection of present invention is not limited to the scope of embodiment statement.
As shown in Figure 1, a device for 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 coolant storage tank 5, gas phase refrigerant storage tank 7, ethylene glycol storage tank 8, ice machine 9, first centrifugal pump 10 and the second centrifugal pump 11; LNG tank 1 is connected with First Heat Exchanger 2 by pipeline, and First Heat Exchanger 2 is connected with the second gasifier 3 and the first gasifier 4 respectively by pipeline; First Heat Exchanger 2 is also connected with liquid phase low temperature coolant storage tank 5 and gas phase coolant storage tank 7 respectively; Liquid phase low temperature coolant storage tank 5 is connected with the first centrifugal pump 10, and the first centrifugal pump 10 is connected with gas phase refrigerant storage tank 7 by pipeline by pipeline and the second heat exchanger 6, second heat exchanger 6; Second heat exchanger 6 is also connected with ice machine 9 and the second centrifugal pump 11 respectively by pipeline, and the 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 is communicated with downstream gas distributing system respectively with the first gasifier 4.Use two gasifiers can realize one open one standby so that emergency.First Heat Exchanger 2, liquid phase low temperature coolant 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 the second centrifugal pump 11 connect and compose refrigerant circulation circuit two.Refrigerant R404A is provided with in liquid phase low temperature coolant storage tank 5; Normal temperature refrigerant ethylene glycol is provided with in ethylene glycol storage tank 8.
First Heat Exchanger 2 and the second heat exchanger 6 preferably adopt shell-and-tube heat exchanger, and in First Heat Exchanger 2, LNG walks tube side, and R404A walks shell side, and cold energy is passed to refrigerant R404A by LNG; In second heat exchanger 6, refrigerant R404A walks tube side, and glycol water walks shell side, and cold energy is passed to glycol water by R404A, and glycol water enters ice-maker makes ice.
First gasifier 4 and the second gasifier 3 all adopt air temperature type cryogenic gas converter, utilize the air of free convection in atmospheric environment as thermal source, carry out heat exchange by the star-like finned tube of Aluminum extrusion that heat conductivility is good and low temperature LNG and make to be gasificated into the gas of normal temperature, need not extra power and energy resource consumption.
Natural gas storage tank 1 is used for storing low-temperature liquefaction natural gas.Refrigerant R404A is in gaseous state before entering First Heat Exchanger 2, becomes low temperature liquid phase after heat exchange, then enters liquid phase low temperature coolant storage tank 5, and liquid phase low temperature coolant storage tank 5 plays current stabilization effect at this to refrigerant, the low temperature refrigerant pump after protection storage tank.After the liquid R404A of low temperature enters the second heat exchanger and ethylene glycol heat exchange, enter gas phase refrigerant storage tank 7, gas phase refrigerant storage tank 7 plays gas storage, current stabilization at this, annotating to obtain effect.Equally, ethylene glycol storage tank 8 plays the effect of liquid storage, current stabilization, filling on ethylene glycol solution pipeloop, guarantees the stable of the ethylene glycol coolant circulatory system and balance.Ice machine 9 adopts MB series ice cream machine, and model is MB200, and quantity is preferably 5, and obtained ice cream weight 30kg, 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 set of ice-making system.In First Heat Exchanger 2,0.3 ~ 0.5MPa, the LNG of-162 ~-160 DEG C and refrigerant R404A carry out heat exchange; In the second heat exchanger 6, refrigerant R404A and refrigerant glycol water carry out heat exchange; In ice machine 9, refrigerant ethylene glycol water and running water carry out heat exchange, complete ice making.A kind of method of cold energy of liquefied natural gas demist ice making: 0.3 ~ 0.5MPa, the LNG of-162 ~-160 DEG C enter First Heat Exchanger 2 from LNG tank 1, LNG and refrigerant R404A heat exchange, temperature rises to-31 ~-65 DEG C, then enters downstream gas distributing system (the first gasifier 4 can be for subsequent use) after the second gasifier 3 heats up.Refrigerant R404A enters First Heat Exchanger 2 through gas phase refrigerant storage tank 7 simultaneously,-35 ~-33 DEG C are reduced to by-25 ~-23 DEG C, the second heat exchanger 6 and glycol water heat exchange is entered out after cooling, temperature raises and return gas phase refrigerant storage tank 7 after-25 ~-23 DEG C, completes the recuperated cycle of refrigerant R404A.Glycol water enters the second heat exchanger 6 from ethylene glycol storage tank 8, with R404A heat exchange, glycol water temperature is reduced to-15 ~-13 DEG C, out ice machine 9 is entered afterwards from the second heat exchanger 6, absorb from heat in running water, temperature raises and return the second heat exchanger 6 and R404A heat exchange after-6 ~-4 DEG C, completes the circulation of refrigerant glycol water.From in the running water input ice machine 9 of grid, with-15 ~-13 DEG C, the heat exchange of 0.2MPa glycol water, obtained ice product, can regulate ice cube formation time in ice machine 9, after 6 ~ 20 hours, ice cube is transported.
Embodiment 1
Adopting the ice machine of ice making capacity 100 tons/day as the cold releasable terminal device of LNG, is 9000m at LNG in amount of vaporization
3during/h, the release of its cold just can meet the demand of ice making every day 100 tons.But added up by the practical operation situation of gasification station, LNG is 9000 ~ 20000Nm in amount of vaporization
3during/h stage, the cold of gasification release every day is greater than the cold needed for ice of system 100 tons, therefore being discharged in time by cold unnecessary beyond ice making by getting rid of ice machine inner cold water, reducing the impact of cold mist when ensureing gasification peak.
-162 DEG C, 5000m
3the liquefied natural gas of/h gasifies through gasifier, and the natural gas becoming normal temperature enters gas distributing system.Insufficient visibility 12m in 60 minutes gasification stations, staff can operate, and cold mist diffuses to the residential block of surrounding always, reduces ambient temperature; Cold mist spreads to surrounding pavement, and visibility slowly reduces, and produces minimal effect to traffic.
In the present embodiment ,-162 DEG C, 0.4MPa, 5000Nm out from LNG tank 1
3lNG and the First Heat Exchanger 2 of/h carry out heat exchange, and temperature is reduced to-37.8 DEG C and then entered in the second newly-increased gasifier 3, is transported to downstream gas distributing system.Gas phase R404A and the LNG of-25 DEG C is after First Heat Exchanger 2 heat exchange, and become-31.7 DEG C, low temperature liquid phase under 0.2MPa, flow is 14.4t/h, flows in liquid phase low temperature coolant storage tank 5.To be transported in the second heat exchanger 6 with glycol water heat exchange to-25 DEG C through the first centrifugal pump 10, to enter gas phase refrigerant storage tank 7, complete the circulation of refrigerant R404A.The ethylene glycol storage tank of-6 DEG C is transported in the second heat exchanger 6 through the second centrifugal pump 11, and become-14.6 DEG C, 0.2MPa after heat exchange, flow is 5t/h, enters ice machine 9, flows back in ethylene glycol storage tank 8, completes the circulation of glycol water.20 DEG C, 0.2MPa, flow is that the running water of 1.85t/h enters in ice machine 9, because tolerance deficiency (is less than 9000Nm
3/ h), all cold energy are all for ice making, and in process, cold energy is used for ice making, after 10 hours, output 100t ice, and in gas station, cold mist obviously declines, 60 minutes visibility 1000m.
Embodiment 2
-162 DEG C, 8750m
3the liquefied natural gas of/h gasifies through gasifier, and the natural gas becoming normal temperature enters gas distributing system.Insufficient visibility 8m in 60 minutes gasification stations, staff can operate, and cold mist diffuses to the residential block of surrounding always, reduces ambient temperature; Cold mist spreads to surrounding pavement, and visibility slowly reduces, and affects traffic.
-162 DEG C, 0.4MPa, 8750m out from LNG tank 1
3lNG and the First Heat Exchanger 2 of/h carry out heat exchange, and temperature is reduced to-32.1 DEG C and then entered in the second newly-increased gasifier 3, is transported to downstream gas distributing system.Gas phase R404A and the LNG of-25 DEG C is after First Heat Exchanger 2 heat exchange, and become-32.2 DEG C, low temperature liquid phase under 0.2MPa, flow is 25.5t/h, flows in liquid phase low temperature coolant storage tank 5.To be transported in the second heat exchanger 6 with glycol water heat exchange to-25 DEG C through the first centrifugal pump 10, to enter gas phase refrigerant storage tank 7, complete the circulation of refrigerant R404A.The ethylene glycol storage tank of-5.7 DEG C is transported in the second heat exchanger 6 through the second centrifugal pump 11, and become-14.8 DEG C, 0.2MPa after heat exchange, flow is 9t/h, enters ice machine 9, flows back in ethylene glycol storage tank 8, completes the circulation of glycol water.20 DEG C, 0.3MPa, flow is that the running water of 3.5t/h enters in ice machine 9, because of moderate (the about 9000Nm of tolerance
3/ h), all cold energy are all for ice making, and in process, cold energy is used for ice making, after 6 hours, output 100t ice, and in gas station, cold mist obviously declines, 60 minutes visibility 850m.
Embodiment 3
-161 DEG C, 12500m
3the liquefied natural gas of/h gasifies through gasifier, and the natural gas becoming normal temperature enters gas distributing system.Insufficient visibility 6m in 60 minutes gasification stations, staff can operate reluctantly, and cold mist diffuses to the residential block of surrounding always, reduces ambient temperature; Cold mist spreads to surrounding pavement, and visibility reduces greatly, has a strong impact on traffic.
-161 DEG C, 0.4MPa, 12500m out from LNG tank 1
3lNG and the First Heat Exchanger 2 of/h carry out heat exchange, and temperature is reduced to-45.9 DEG C and then entered in the second newly-increased gasifier 3, is transported to downstream gas distributing system.Gas phase R404A and the LNG of-23 DEG C is after First Heat Exchanger 2 heat exchange, and become-35 DEG C, low temperature liquid phase under 0.2MPa, flow is 34.5t/h, flows in liquid phase low temperature coolant storage tank 5.To be transported in the second heat exchanger 6 with glycol water heat exchange to-23 DEG C through the first centrifugal pump 10, to enter gas phase refrigerant storage tank 7, complete the circulation of refrigerant R404A.The ethylene glycol storage tank of-6.8 DEG C is transported in the second heat exchanger 6 through the second centrifugal pump 11, and become-15.9 DEG C, 0.2MPa after heat exchange, flow is 15t/h, enters ice machine 9, flows back in ethylene glycol storage tank 8, completes the circulation of glycol water.20 DEG C, 0.15MPa, flow is that the running water of 5.85t/h enters in ice machine 9, because tolerance abundance (is greater than 9000Nm
3/ h), unnecessary cold energy is used for demist, and after 8 hours, output 100t ice, in gas station, cold mist obviously declines, 60 minutes visibility 800m.
Embodiment 4
-162 DEG C, 16250m
3the liquefied natural gas of/h gasifies through gasifier, and the natural gas becoming normal temperature enters gas distributing system.Insufficient visibility 2m in 60 minutes gasification stations, staff can not operate, and cold mist diffuses to the residential block of surrounding always, reduces ambient temperature; Cold mist spreads to surrounding pavement, and visibility reduces greatly, has a strong impact on traffic.
-162 DEG C, 0.4MPa, 16250m out from LNG tank 1
3lNG and the First Heat Exchanger 2 of/h carry out heat exchange, and temperature is reduced to-55.8 DEG C and then entered in the second newly-increased gasifier 3, is transported to downstream gas distributing system.Gas phase R404A and the LNG of-24.5 DEG C is after First Heat Exchanger 2 heat exchange, and become-32.8 DEG C, low temperature liquid phase under 0.2MPa, flow is 44.2t/h, flows in liquid phase low temperature coolant storage tank 5.To be transported in the second heat exchanger 6 with glycol water heat exchange to-24.5 DEG C through the first centrifugal pump 10, to enter gas phase refrigerant storage tank 7, complete the circulation of refrigerant R404A.The ethylene glycol storage tank of-6.5 DEG C is transported in the second heat exchanger 6 through the second centrifugal pump 11, and become-15.9 DEG C, 0.2MPa after heat exchange, flow is 18t/h, enters ice machine 9, flows back in ethylene glycol storage tank 8, completes the circulation of glycol water.20 DEG C, 0.2MPa, flow is that the running water of 7.25t/h enters in ice machine 9, because tolerance abundance (is greater than 9000Nm
3/ h), unnecessary cold energy is used for demist, after 12 hours, output 100t ice, and in gas station, cold mist obviously declines, 60 minutes visibility 600m.
Embodiment 5
-160 DEG C, 20000m
3the liquefied natural gas of/h gasifies through gasifier, and the natural gas becoming normal temperature enters gas distributing system.Insufficient visibility 1m in 60 minutes gasification stations, staff cannot operate completely, and cold mist diffuses to the residential block of surrounding always, reduces ambient temperature; Cold mist spreads to surrounding pavement, and visibility reduces greatly, has a strong impact on traffic.
-160 DEG C, 0.4MPa, 20000m out from LNG tank 1
3lNG and the First Heat Exchanger 2 of/h carry out heat exchange, and temperature is reduced to-65.5 DEG C and then entered in the second newly-increased gasifier 3, is transported to downstream gas distributing system.Gas phase R404A and the LNG of-23.8 DEG C is after First Heat Exchanger 2 heat exchange, and become-31.9 DEG C, low temperature liquid phase under 0.2MPa, flow is 51.5t/h, flows in liquid phase low temperature coolant storage tank 5.To be transported in the second heat exchanger 6 with glycol water heat exchange to-23.8 DEG C through the first centrifugal pump 10, to enter gas phase refrigerant storage tank 7, complete the circulation of refrigerant R404A.The ethylene glycol storage tank of-5.4 DEG C is transported in the second heat exchanger 6 through the second centrifugal pump 11, and become-15.2 DEG C, 0.2MPa after heat exchange, flow is 19t/h, enters ice machine 9, flows back in ethylene glycol storage tank 8, completes the circulation of glycol water.20 DEG C, 0.25MPa, flow is that the running water of 7.95t/h enters in ice machine 9, because tolerance abundance (is greater than 9000Nm
3/ h), unnecessary cold energy is used for demist, after 15 hours, output 100t ice, and in gas station, cold mist obviously declines, 60 minutes visibility 500m.
As shown in table 1, in above-described embodiment, LNG inlet temperature is-162 ~-160 DEG C, and inlet and outlet pressure is 0.4MPa; R404A inlet temperature remains on-25 ~-23 DEG C, and outlet temperature remains on-35 ~-33 DEG C, and inlet and outlet pressure is 0.2MPa; The inlet temperature of glycol water remains on-7 ~-5 DEG C, and outlet temperature remains on-16 ~-14 DEG C; The inlet temperature of running water remains on 20 DEG C, and in ice machine, ice is 0 DEG C, controls its temperature by the flow of control R404A, glycol water and running water.
Table 1
During with gas low ebb, under the prerequisite controlling gas outlet temperature control-31 ~-65 DEG C, reduce running water and enter the discharge of ice machine 9 and the discharge of ice machine 9 discharge, control glycol water outlet temperature and maintain-16 ~-14 DEG C, control the outlet temperature-35 ~-33 DEG C of refrigerant R404A.In the control stage, if the outlet temperature of natural gas is difficult to control, need the flow regulating the glycol water circulatory system and the R404A circulatory system.
During with gas peak, under the prerequisite controlling gas outlet temperature-31 ~-65 DEG C, increase running water and enter the discharge of ice machine 9 and the discharge of ice machine 9 discharge, cold energy is shifted rapidly, avoids the formation of a large amount of cold mist.Control glycol water outlet temperature and maintain-16 ~-14 DEG C, control the outlet temperature-35 ~-33 DEG C of refrigerant R404A.In the control stage, if the outlet temperature of natural gas is difficult to control, need the flow regulating the glycol water circulatory system and the R404A circulatory system.
The present invention not only eliminates the cold mist in gas station, and is used for ice making by with cold energy during gas low ebb, has reclaimed cold energy, has reduced the consumption of electric energy in electric ice making, add economic benefit simultaneously.And apparatus of the present invention flexibility is stronger, control ice-making capacity, just meets the demand of periphery ice user, is unlikely to the unsalable of ice.Achieve the peak regulating function of city natural gas pipe network and electrical network and significantly put forward high-octane utilization ratio.If get LNG amount of vaporization 5000 ~ 20000Nm
3/ h, then system gross investment about 1000 about ten thousand, can economize on electricity about 2,040,000 yuan every year, and annual value of selling ice generation is about about 7,200,000 yuan.
Claims (5)
1. the method for a cold energy of liquefied natural gas ice making demist, it is characterized in that: 0.3 ~ 0.5MPa, the LNG of-162 ~-160 DEG C enter First Heat Exchanger from LNG tank, LNG and refrigerant R404A heat exchange, temperature rises to-31 ~-65 DEG C, then enters downstream gas distributing system after the second gasifier heats up; Refrigerant R404A enters after First Heat Exchanger and LNG heat exchange through gas phase refrigerant storage tank simultaneously,-35 ~-33 DEG C are reduced to by-25 ~-23 DEG C, enter the second heat exchanger after cooling, with glycol water heat exchange out, temperature raises as returning gas phase refrigerant storage tank after-25 ~-23 DEG C; Glycol water enters the second heat exchanger from ethylene glycol storage tank, after refrigerant R404A heat exchange, glycol water temperature is reduced to-15 ~-13 DEG C, glycol water out enters ice machine afterwards from the second heat exchanger, absorb from heat in running water, temperature raises and return the second heat exchanger and R404A heat exchange after-6 ~-4 DEG C; From in the running water input ice machine of grid, with-15 ~-13 DEG C, the heat exchange of 0.2MPa glycol water, obtained ice product; Cold energy is used for ice making by LNG, realizes cold energy of liquefied natural gas ice making demist;
LNG tank is connected with First Heat Exchanger by pipeline, and First Heat Exchanger is connected with gasifier by pipeline; First Heat Exchanger is also connected with liquid phase low temperature coolant storage tank and gas phase coolant storage tank respectively; Liquid phase low temperature coolant storage tank is connected with the first centrifugal pump, and the first centrifugal pump is connected with the second heat exchanger by pipeline, and the second heat exchanger is connected with gas phase refrigerant storage tank by pipeline; Second heat exchanger is also connected with ice machine and the second centrifugal pump respectively by pipeline, and the second centrifugal pump is connected with ethylene glycol storage tank, and ethylene glycol storage tank is connected with ice machine, and ice machine connects water supply pipe.
2. the method for cold energy of liquefied natural gas ice making demist according to claim 1, is characterized in that: when the LNG amount of vaporization of LNG gasification station is at 5000 ~ 20000Nm
3during/h, visibility reaches 500 ~ 1000m.
3. the method for cold energy of liquefied natural gas ice making demist according to claim 1, it is characterized in that: described gasifier is two, be the second gasifier and the first gasifier respectively, First Heat Exchanger is connected with the second gasifier and the first gasifier respectively by pipeline; Second gasifier is communicated with downstream gas distributing system respectively with the first gasifier.
4. the method for cold energy of liquefied natural gas ice making demist according to claim 3, is characterized in that: described first gasifier and the second gasifier all adopt air temperature type cryogenic gas converter.
5. the method for cold energy of liquefied natural gas ice making demist according to claim 1, is characterized in that: described First Heat Exchanger and the second heat exchanger adopt shell-and-tube heat exchanger.
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| CN106288865B (en) * | 2016-08-31 | 2018-05-22 | 江苏密友粉体新装备制造有限公司 | A kind of cooling technique of the crushing source of the gas of deep cooling crush |
| CN108518904A (en) * | 2018-06-13 | 2018-09-11 | 南京工业大学 | Device for preparing solid ice and providing cold source for ship air conditioning system by using L NG vaporization release cold energy and cold energy providing method thereof |
| CN110274416A (en) * | 2019-07-17 | 2019-09-24 | 西安热工研究院有限公司 | A kind of system that LNG cold energy is used for air cooling tower misting cooling |
| CN110513932A (en) * | 2019-09-05 | 2019-11-29 | 浙江紫明科技有限公司 | LNG cold energy recycles ice-making system |
| CN110701842A (en) * | 2019-10-22 | 2020-01-17 | 航天科工哈尔滨风华有限公司 | Gasification system for making snow and ice by using LNG cold energy |
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