CN103954090B - A kind of cold-storage refrigeration storage system that can make full use of cold energy of liquefied natural gas - Google Patents
A kind of cold-storage refrigeration storage system that can make full use of cold energy of liquefied natural gas Download PDFInfo
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- CN103954090B CN103954090B CN201410142527.8A CN201410142527A CN103954090B CN 103954090 B CN103954090 B CN 103954090B CN 201410142527 A CN201410142527 A CN 201410142527A CN 103954090 B CN103954090 B CN 103954090B
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Abstract
The invention discloses a kind of cold-storage refrigeration storage system that can make full use of cold energy of liquefied natural gas, it comprises liquefied natural gas gasifying system, Glycol Circulation System and cold water circulating system, it also comprises cold accumulation system and refrigeration system, wherein, (1) liquefied natural gas gasifying system comprises liquefied natural gas-ethylene glycol heat exchanger; (2) Glycol Circulation System comprises two series loops; (3) cold water circulating system comprises water circulation pipe; (4) cold accumulation system comprises charge cycle pipeline; (5) refrigeration system comprises the refrigerating circulation that the outlet through condenser is connected with the import of pressure-difference valve, water circulating pump, check-valves, evaporimeter, plate type heat exchanger and condenser successively.Advantage of the present invention: this system, under the prerequisite not affecting liquefied natural gas gasifying, plays the function of cold energy of liquefied natural gas peak load shifting, effectively improves the Energy Efficiency Ratio of kind of refrigeration cycle, fully ensure that refrigeration performance is stablized.
Description
Technical field
The present invention relates to a kind of cold storage refrigerating system, particularly relate to a kind of cold-storage refrigeration storage system that can make full use of cold energy of liquefied natural gas.
Background technology
Liquefied natural gas be natural gas after desulfurization, processed, then through low temperature process liquefaction the liquefied mixture of-160 DEG C.According to statistics, the 1 ton of natural gas power consumption that often liquefies is about 850kWh.In liquefied natural gas receiving station, need by liquefied natural gas by using after gasifier gasification.The heat absorbed during gasification, its value is approximately 830kJ/kg.This part cold energy can be lost with seawater or air usually in natural gas vaporizer, not only causes the significant wastage of the energy, also loses the due cold energy use of liquefied natural gas self and is worth.Existing cold energy of liquefied natural gas utilizes the zero load ancillary method of technology, and the supply and demand of its cold energy of liquefied natural gas is not mated, and when its cold is less without auxiliary standby refrigeration system, cooling load stability declines; When cold is sufficient, self storage capacity is limited, and its range of application is diminished.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of effective cold-storage refrigeration storage system that can make full use of cold energy of liquefied natural gas improving the Energy Efficiency Ratio of refrigeration system is provided.This system energy economize energy, minimizing fossil fuel are to the pollution of environment, and be conducive to the use value improving liquefied natural gas, in addition, this system has the function that cold energy stores, and can guarantee the high efficiency smooth of freezer refrigerating performance simultaneously.
A kind of cold-storage refrigeration storage system that can make full use of cold energy of liquefied natural gas of the present invention, it comprises liquefied natural gas gasifying system, Glycol Circulation System and cold water circulating system, and it also comprises cold accumulation system and refrigeration system, wherein,
(1) the liquefied natural gas gasifying system described in comprises liquefied natural gas-ethylene glycol heat exchanger, and described liquefied natural gas-ethylene glycol heat exchanger is used for the liquefied natural gas in tube side and the ethylene glycol heat exchange in shell side;
(2) Glycol Circulation System described in comprises two series loops, first series loop is followed in series to form by ethylene glycol storage tank, quick action emergency valve B, eg pump A and liquefied natural gas-ethylene glycol heat exchanger, and the import department of ethylene glycol storage tank is provided with temperature sensor B; Second series loop is followed in series to form by ethylene glycol storage tank, quick action emergency valve C, eg pump B, ethylene glycol-water-to-water heat exchanger and triple valve A; Described ethylene glycol storage tank for store with liquefied natural gas heat exchange after ethylene glycol and give ethylene glycol-water-to-water heat exchanger cold is provided;
(3) cold water circulating system described in comprises the water circulation pipe be connected with the water inlet of water pump, condenser and ethylene glycol-water-to-water heat exchanger successively through ethylene glycol-water-to-water heat exchanger delivery port, the water circulation pipe at leaving condenser water mouth place is connected with temperature sensor A, described condenser is used for the water that ethylene glycol-water-to-water heat exchanger extracts out and carries out heat exchange with the refrigerating medium in refrigeration system, and the water after intensification is returned to ethylene glycol-water-to-water heat exchanger;
(4) cold accumulation system described in comprises charge cycle pipeline triple valve B, stop valve, plate type heat exchanger, cold-storage water pump, triple valve C and regenerator are connected to form by pipeline, described triple valve B is connected with triple valve A by connecting line, described triple valve C one end is connected with regenerator, the other end is connected with cold-storage water pump, and the 3rd end is connected with ethylene glycol-water-to-water heat exchanger; The out-of-date cold-storage of the glycol flow of described regenerator in ethylene glycol storage tank, stores the ethylene glycol cold after part and liquefied natural gas heat exchange, discharges when cold is not enough;
(5) refrigeration system described in comprises the refrigerating circulation that the outlet through condenser is connected with the import of pressure-difference valve, water circulating pump, check-valves, evaporimeter, plate type heat exchanger and condenser successively, and temperature sensor C is connected in the refrigerating circulation at evaporator inlet place; When plate type heat exchanger is used for the cold deficiency when liquefied natural gas, by the Cooling capacity exchanging that stores in regenerator to the refrigerating medium in refrigeration system, complete the exchange process of cold.
Advantage of the present invention: this system, under the prerequisite not affecting liquefied natural gas gasifying, plays the function of cold energy of liquefied natural gas peak load shifting, effectively improves the Energy Efficiency Ratio of kind of refrigeration cycle, fully ensure that refrigeration performance is stablized.
Accompanying drawing explanation
Accompanying drawing is a kind of structural representation that can make full use of the cold-storage refrigeration storage system of cold energy of liquefied natural gas of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
A kind of cold-storage refrigeration storage system that can make full use of cold energy of liquefied natural gas of the present invention as shown in drawings, it comprises liquefied natural gas gasifying system, Glycol Circulation System and cold water circulating system, and it also comprises cold accumulation system and refrigeration system; Wherein,
(1) the liquefied natural gas gasifying system described in comprises liquefied natural gas-ethylene glycol heat exchanger 4, and described liquefied natural gas-ethylene glycol heat exchanger 4 is for by the liquefied natural gas in tube side and the ethylene glycol heat exchange in shell side; Existing liquefied natural gas gasifying system comprises as shown in the figure: LNG tank 1, empty temperature gasifier A2, empty temperature gasifier B3 and liquefied natural gas-ethylene glycol heat exchanger 4, each equipment forms circulation line by placed in series.Wherein, natural gas outlet pipe 5 is drawn by the pipeline between sky temperature gasifier A2 and sky temperature gasifier B3, and is provided with Safety relief valve 6.And pipeline between sky temperature gasifier A2 and liquefied natural gas-ethylene glycol heat exchanger 4 is provided with quick action emergency valve A7 and stop valve A8, the pipeline fairlead between quick action emergency valve A7 and stop valve A8 is directly received on the outlet conduit of LNG tank by stop valve B9.The liquefied natural gas of this circulation line is at the Bottomhole pressure of liquefied natural gas-ethylene glycol heat exchanger 4.
(2) Glycol Circulation System described in comprises two series loops, first series loop is followed in series to form by ethylene glycol storage tank 10, quick action emergency valve B14, eg pump A11 and liquefied natural gas-ethylene glycol heat exchanger 4, and the import department of ethylene glycol storage tank 10 is provided with temperature sensor B27; Second series loop is followed in series to form by ethylene glycol storage tank 10, quick action emergency valve C15, eg pump B13, ethylene glycol-water-to-water heat exchanger 12 and triple valve A23; Described ethylene glycol storage tank 10 for store with liquefied natural gas heat exchange after ethylene glycol and give ethylene glycol-water-to-water heat exchanger 12 cold is provided;
(3) cold water circulating system described in comprises the water circulation pipe be connected with the water inlet of water pump 16, condenser 17 and ethylene glycol-water-to-water heat exchanger 12 successively through ethylene glycol-water-to-water heat exchanger 12 delivery port, the water circulation pipe of condenser 17 water outlet is connected with temperature sensor A18, refrigerating medium in the water that described condenser 17 is extracted out for ethylene glycol-water-to-water heat exchanger 12 and refrigeration system carries out heat exchange, and the water after heating up is returned to ethylene glycol-water-to-water heat exchanger 12;
(4) cold accumulation system) comprises charge cycle pipeline triple valve B28, stop valve 30, plate type heat exchanger 24, cold-storage water pump 25, triple valve C and regenerator 29 are connected to form by pipeline, described triple valve B28 is connected with triple valve A by connecting line, described triple valve C32 one end is connected with regenerator 29, the other end is connected with cold-storage water pump 25, and the 3rd end is connected with ethylene glycol-water-to-water heat exchanger 12; The described out-of-date cold-storage of the glycol flow of regenerator 29 in ethylene glycol storage tank, stores the ethylene glycol cold after part and liquefied natural gas heat exchange, discharges when cold is not enough; By the adjustment of triple valve A23, the part ethylene glycol in Glycol Circulation System second series loop is made to enter regenerator 29 by triple valve A23 and triple valve B28, the valve port that triple valve C32 leads to cold-storage water pump 25 side is closed, complete process of cool, cold discharges by the refrigerating medium heat-shift when cold is not enough and in refrigeration system;
(5) refrigeration system described in comprises the refrigerating circulation that the outlet through condenser 17 is connected with the import of pressure-difference valve 19, water circulating pump 22, check-valves 33, evaporimeter 20, plate type heat exchanger 24 and condenser 17 successively, and temperature sensor C21 is connected in the refrigerating circulation of evaporimeter 20 porch; Plate type heat exchanger 24, for when the cold of liquefied natural gas is not enough, by the Cooling capacity exchanging of storage in regenerator 29 to the refrigerating medium in refrigeration system, completes the exchange process of cold.When system cold is more than needed or freezer refrigerating interval time, triple valve A23 starts, and cool storage function operation, cold more than needed is stored in regenerator 29.In freezer normally works, when cold energy of liquefied natural gas is not enough, charge cycle system starts, and by plate type heat exchanger 24, cold is supplied cold storage refrigerating system.
Preferred quick action emergency valve A7, eg pump A11, eg pump B13, quick action emergency valve B14, quick action emergency valve C15, water pump 16, temperature sensor A18, temperature sensor B27 are connected to realize Automated condtrol with control system 31 respectively by wire with temperature sensor C21.
The course of work of this device is:
Liquefied natural gas is divided into two-way: a road is the natural gas that liquefied natural gas enters that empty temperature gasifier A gasification is normal temperature, then enters urban pipe network by stop valve and gas outlet pipeline, completes the gasification of liquefied natural gas; Another road liquefied natural gas enters liquefied natural gas-ethylene glycol heat exchanger and ethylene glycol heat exchange, after gasification through sky temperature gasifier B re-heat to normal temperature, then to mix with the natural gas in the liquefied natural gas system of last road, finally send into urban pipe network.When system cold is had more than needed, directly by refrigeration system cooling, when system cold is more than needed or freezer refrigerating interval time, triple valve A23 starts, cool storage function runs, from the part ethylene glycol of Glycol Circulation System second series loop through triple valve A23, regenerator 29 is entered into by triple valve A23 and triple valve B28, the valve port that triple valve C now leads to cold-storage water pump 25 side is closed, the valve port that triple valve C leads to the second series loop of Glycol Circulation System is opened, cold more than needed so has just been stored in regenerator 29, and process of cool is achieved.When cold storage capacity reaches the assumed load of regenerator 29, the three-way control valve A23 in cold-storage leads to the path blockade of regenerator 29 side.In freezer normally works, when the cold that condenser provides is not enough, charge cycle system starts, the valve port that triple valve A23 leads to triple valve B28 is closed, the pipeline that triple valve C32 leads to cold-storage water pump 25 side is open-minded, the valve port that triple valve C leads to the second series loop of Glycol Circulation System is closed, cold in regenerator 29 is carried by the refrigerating working medium in cold accumulation system, and pass through plate type heat exchanger 24 by Cooling capacity exchanging to the refrigerating medium of cold storage refrigerating system, then the refrigerating working medium in cold accumulation system get back in regenerator 29 through stop valve 30, triple valve B28.The cold supply freezer refrigerating that cold in regenerator 29 will be stored by plate type heat exchanger 24, realizes the refrigerating function storing cold.Guarantee by this circulation the stability that freezer refrigerating cold is supplied, improve cold energy of liquefied natural gas utilization rate.The selection of refrigerating medium can be selected according to Refrigerating House Design operating mode.Cold-storage is stored by the cold that liquefied natural gas is more than needed, stores cold mainly through the phase-change material in regenerator 29 or other measures.When the refrigeration of cold-storage and freezer is carried out simultaneously, and the ethylene glycol after liquefied natural gas heat exchange is punished as two-way at triple valve A23: the ethylene glycol in a branch road is by the pipeline section between triple valve A23 and triple valve B28, after flowing through regenerator 29, then flow back to ethylene glycol second series loop by triple valve C32; Ethylene glycol in another branch road is by the pipeline between triple valve A23 and ethylene glycol-water-to-water heat exchanger 12, enter ethylene glycol-water-to-water heat exchanger 12, again with the water coke slurry cold in chilled water system, this part cold is by refrigeration system to freezer refrigerating, and the refrigeration of cold-storage and freezer is carried out simultaneously thus.
The scope of application of the present invention is: middle-size and small-size LNG Vaporizing Station.
Claims (2)
1. can make full use of a cold-storage refrigeration storage system for cold energy of liquefied natural gas, it comprises liquefied natural gas gasifying system, Glycol Circulation System and cold water circulating system, it is characterized in that: it also comprises cold accumulation system and refrigeration system, wherein,
(1) the liquefied natural gas gasifying system described in comprises liquefied natural gas-ethylene glycol heat exchanger, and described liquefied natural gas-ethylene glycol heat exchanger is used for the liquefied natural gas in tube side and the ethylene glycol heat exchange in shell side;
(2) Glycol Circulation System described in comprises two series loops, first series loop is followed in series to form by ethylene glycol storage tank, quick action emergency valve B, eg pump A and liquefied natural gas-ethylene glycol heat exchanger, and the import department of ethylene glycol storage tank is provided with temperature sensor B; Second series loop is followed in series to form by ethylene glycol storage tank, quick action emergency valve C, eg pump B, ethylene glycol-water-to-water heat exchanger and triple valve A; Described ethylene glycol storage tank for store with liquefied natural gas heat exchange after ethylene glycol and give ethylene glycol-water-to-water heat exchanger cold is provided;
(3) cold water circulating system described in comprises the water circulation pipe be connected with the water inlet of water pump, condenser and ethylene glycol-water-to-water heat exchanger successively through ethylene glycol-water-to-water heat exchanger delivery port, the water circulation pipe at leaving condenser water mouth place is connected with temperature sensor A, described condenser is used for the water that ethylene glycol-water-to-water heat exchanger extracts out and carries out heat exchange with the refrigerating medium in refrigeration system, and the water after intensification is returned to ethylene glycol-water-to-water heat exchanger;
(4) cold accumulation system described in comprises charge cycle pipeline triple valve B, stop valve, plate type heat exchanger, cold-storage water pump, triple valve C and regenerator are connected to form by pipeline, described triple valve B is connected with triple valve A by connecting line, described triple valve C one end is connected with regenerator, the other end is connected with cold-storage water pump, and the 3rd end is connected with ethylene glycol-water-to-water heat exchanger; The out-of-date cold-storage of the glycol flow of described regenerator in ethylene glycol storage tank, stores the ethylene glycol cold after part and liquefied natural gas heat exchange, discharges when cold is not enough;
(5) refrigeration system described in comprises the refrigerating circulation that the outlet through condenser is connected with the import of pressure-difference valve, water circulating pump, check-valves, evaporimeter, plate type heat exchanger and condenser successively, and temperature sensor C is connected in the refrigerating circulation at evaporator inlet place; When plate type heat exchanger is used for the cold deficiency when liquefied natural gas, by the Cooling capacity exchanging that stores in regenerator to the refrigerating medium in refrigeration system, complete the exchange process of cold.
2. the cold-storage refrigeration storage system that can make full use of cold energy of liquefied natural gas according to claim 1, is characterized in that: eg pump A, eg pump B, quick action emergency valve B, quick action emergency valve C, water pump, temperature sensor A, temperature sensor B are connected with control system respectively by wire with temperature sensor C.
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| CN112393486B (en) * | 2020-11-06 | 2022-06-21 | 中国海洋石油集团有限公司 | Method for utilizing cold energy of liquefied natural gas |
| CN112303769A (en) * | 2020-11-16 | 2021-02-02 | 安瑞科(蚌埠)压缩机有限公司 | LNG cold energy recycling and storing device |
| CN112629069A (en) * | 2020-12-10 | 2021-04-09 | 华南理工大学 | Multi-energy complementary LNG cold energy integrated utilization process and device |
| CN113932513A (en) * | 2021-11-05 | 2022-01-14 | 浙江智海化工设备工程有限公司 | Liquefied natural gas cold energy utilization device |
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