CN103256762A - Process and device for making ice by utilizing liquefied natural gas cold energy - Google Patents
Process and device for making ice by utilizing liquefied natural gas cold energy Download PDFInfo
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- CN103256762A CN103256762A CN2013101890171A CN201310189017A CN103256762A CN 103256762 A CN103256762 A CN 103256762A CN 2013101890171 A CN2013101890171 A CN 2013101890171A CN 201310189017 A CN201310189017 A CN 201310189017A CN 103256762 A CN103256762 A CN 103256762A
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Abstract
The invention discloses a process and device for making ice by utilizing liquefied natural gas cold energy. According to the device for making ice by utilizing the liquefied natural gas cold energy, round holes with a diameter of 3-5 mm are distributed in a separation plate with the holes, the aperture ratio of the separation plate with the holes is 10-15%, and a core pump and a water centrifugal pump are provided. The separation plate with the holes separates two tubular heat exchangers into an upper shell-and-tube heat exchanger and a lower shell-and-tube heat exchanger. A U-shaped tube type array pipe is arranged in the upper shell-and-tube heat exchanger, one end of the U-shaped tube type array pipe is communicated with a liquefied natural gas storage tank, and the other end of the U-shaped tube type array pipe is communicated with a gasifier. A U-shaped tube type array pipe is arranged in the lower shell-and-tube heat exchanger, one end of the U-shaped tube type array pipe is communicated with an ice maker through the ethylene glycol aqueous solution centrifugal pump, and the other end of the U-shaped tube type array pipe is communicated with the ice maker through a pipeline. By means of the process and device for making ice by utilizing the liquefied natural gas cold energy, additional mechanical equipment is not needed to promote flowing of R404A, automatic cycle heat exchange is achieved, equipment space is saved, demanded amount of refrigerant is lowered, equipment investment is reduced, and civil engineering work amount is saved.
Description
Technical field
The present invention relates to the ice-making technology field, be specifically related to a kind of cold energy of liquefied natural gas ice making technology and device of utilizing.
Background technology
Liquefied natural gas (LNG) be by the low natural gas that pollutes through depickling, processed, low temperature (162 ℃) the liquid mixture of making by the low temperature process cryogenic liquefaction.In LNG receiving station, need LNG is used by vaporizer gasification back, according to measuring and calculating, LNG gasification per ton is equivalent to discharge the cold energy of 830～860 megajoules, these cold energy is reclaimed can produce huge economic benefit.Simultaneously, in LNG cold energy development and use process, almost without any pollutant emission, be a kind of environmental protection energy.The available cold power of one 3,000,000 tons/year LNG receiving station is 76 megawatts (deduction is consumed in the pressure energy of the outer gas transmission body of high pressure), amounts to electric energy about 1,000,000,000 kilowatt hours, is equivalent to one 200,000 kilowatts the generated energy in 1 year of power plant.
At present, there are 38 LNG receiving stations in the whole world in operation 11 countries and regions, and wherein Japan has 23.Present LNG cold energy use mode is that liquid CO is pulverized, produced to the low temperature fire with generating, deep cooling
2With dry ice, freezer, artificial ice and snow, ice making and cold water air-conditioning, in the cold industry of many need, the tool development potentiality of ice making industry.
China utility model patent CN200620118915.3 discloses the cold recovery ice storage unit of a kind of lng regas.In this utility model, gasify the again cold that discharges of LNG is carried by refrigerant and is released in the water that accumulator puts, and the frozen water that accumulator is put uses for the user by pipeline, effective recycling gasify the again cold energy of generation of LNG.
The application of LNG cold energy ice making generally is that the refrigerant medium is taken away the cold energy that LNG contains in the middle of adopting, and the refrigerant medium passes to refrigerant with cold energy again, and last refrigerant enters ice machine again.In this technology, need heat exchanger and the extraordinary medium of two extraordinary models.Though this ice-making system technology is ripe relatively, shortcoming such as floor space is big, the refrigerant demand is big, equipment investment and civil engineering investment are big influences economic benefit and social benefit that the LNG cold energy is used greatly.
Summary of the invention
The invention reside in the problem that overcomes the prior art existence, providing a kind of does not need extra plant equipment to promote flowing of refrigerant R404A, realizes cold energy of liquefied natural gas ice making technology and the device of automatic cycle heat exchange.
Dividing plate with holes is split up into shell-and-tube heat exchanger and following shell-and-tube heat exchanger with two pipe heat exchangers among the present invention; Temperature reduces liquefy after last shell-and-tube heat exchanger gaseous state R404A and LNG heat exchange, relies on self gravitation, by the drainage of the aperture above the dividing plate, enters down shell-and-tube heat exchanger and the glycol water heat exchange becomes gaseous state, finishes to circulate.The present invention does not need extra plant equipment to promote flowing of R404A, belongs to automatic cycle heat exchange.
The object of the invention is achieved through the following technical solutions:
?162～?160 ℃, 0.3～0.5MPa, the LNG of 230～460kg/h comes out to enter in LNG tank on the double type heat exchanger the shell-and-tube heat exchanger, with Qi Tai ?20 ℃, 0.3MPa, the R404A heat exchange of 960～1920kg/h, the LNG temperature rises high to 20 ℃ of ?25～?, enters gas distributing system after gasifier heats up; On the double type heat exchanger in the shell-and-tube heat exchanger, R404A temperature Jiang Di Zhi ?22 ℃, by the gaseous state liquefy, liquid R404A relies on self gravitation, in dividing plate with holes enters down the shell-and-tube heat exchanger housing; In following shell-and-tube heat exchanger, after liquid R404A and the glycol water heat exchange temperature Sheng Gao Dao ?20 ℃, be the gaseous state rising, in dividing plate with holes entered the shell-and-tube heat exchanger housing, circulation was finished in the R404A of gaseous state and LNG heat exchange again; ?22 ℃, 0.3MPa, the R404A Yu of 960～1920kg/h ?7 ℃～?5 ℃, 0.2～0.3MPa, 5600 ?glycol water heat exchange in following shell-and-tube heat exchanger of 11200kg/h; The temperature Jiang Di Zhi of glycol water ?15～?13 ℃, enter ice-maker makes ice, after the water heat exchange of glycol water and ice machine temperature Sheng Gao Dao ?7～?5 ℃, pump to down the shell-and-tube heat exchanger housing through the glycol water centrifugal pump, finish circulation.
Circular hole on the described dividing plate with holes is equilateral triangle and arranges.The mass concentration of described glycol water is 30%.Described going up on shell-and-tube heat exchanger and the following shell-and-tube heat exchanger all is equipped with the temperature and pressure sensor.The described temperature and pressure sensor of going up shell-and-tube heat exchanger is contained in the heat exchanger top apart from end socket 30cm place, right side; The described temperature and pressure sensor of shell-and-tube heat exchanger down is contained in the heat exchanger lowermost end apart from end socket 30cm place, right side.
That uses said apparatus utilizes cold energy of liquefied natural gas ice making technology: 160 ℃ of ?162～?, 0.3～0.5MPa, the LNG of 230～460kg/h comes out to enter in LNG tank on the double type heat exchanger the shell-and-tube heat exchanger, refrigerant R404A heat exchange with 0.3MPa, temperature Sheng Zhi ?30～?25 ℃, pass through gasifier again, enter the downstream gas distributing system after the intensification, with Qi Tai ?20 ℃, 0.3MPa, the R404A heat exchange of 960～1920kg/h, the LNG temperature rises high to 20 ℃ of ?25～?, enters gas distributing system after gasifier heats up; On the double type heat exchanger in the shell-and-tube heat exchanger in, R404A temperature Jiang Di Zhi ?22 ℃, by the gaseous state liquefy, liquid R404A relies on self gravitation, in dividing plate with holes enters down the shell-and-tube heat exchanger housing; In following shell-and-tube heat exchanger, after liquid R404A and the glycol water heat exchange temperature Sheng Gao Dao ?20 ℃, be the gaseous state rising, in dividing plate with holes entered the shell-and-tube heat exchanger housing, circulation was finished in the R404A of gaseous state and LNG heat exchange again; ?22 ℃, 0.3MPa, the R404A Yu of 960～1920kg/h ?7 ℃～?5 ℃, 0.2～0.3MPa, 5600 ?glycol water heat exchange in following shell-and-tube heat exchanger of 11200kg/h; The temperature Jiang Di Zhi of glycol water ?15～?13 ℃, enter ice-maker makes ice, after the water heat exchange of glycol water and ice machine temperature Sheng Gao Dao ?7～?5 ℃, pump to down the shell-and-tube heat exchanger housing through the glycol water centrifugal pump, finish circulation.
The invention has the advantages that:
(1) heat exchanger adopts the heat exchange structure of bivalve layer, in the middle of two pipe heat exchangers, add a dividing plate with holes, on the top of bivalve pass heat exchanger in the shell-and-tube heat exchanger, temperature reduces liquefy after gaseous state R404A and the LNG heat exchange, rely on self gravitation, by the drainage of the aperture above the dividing plate, enter the heat exchanger lower part and the glycol water heat exchange becomes gaseous state, finish to circulate.Do not need extra plant equipment to promote flowing of R404A in the technology, belong to automatic cycle heat exchange.
(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, and reduced investment, reduce floor space, be easy to realize extension production.
(3) increase working medium R404A, avoid ethylene glycol solution to solidify freezing stifled, operating flexibility is big, the device fabrication difficulty is less.
Description of drawings
Fig. 1 is the apparatus structure schematic diagram of cold energy of liquefied natural gas ice making of the present invention;
Shown in the figure: LNG tank 1, gasifier 2, bivalve pass heat exchanger 3, ice machine 4, glycol water centrifugal pump 5, water centrifugal pump 6.
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 that utilizes the cold energy of liquefied natural gas ice making comprises LNG tank 1, gasifier 2, bivalve pass heat exchanger 3, ice machine 4, glycol water centrifugal pump 5 and water centrifugal pump 6; Bivalve pass heat exchanger 3 adopts bivalve journey structure that two shell-and-tube heat exchangers are integrated, separate by a dividing plate with holes at two shell-and-tube heat exchangers, the diameter that distributing on the dividing plate with holes is the circular hole of 3～5mm, the percent opening of dividing plate with holes is 10%～15%, and circular hole preferably is equilateral triangle and arranges; Dividing plate with holes is split up into shell-and-tube heat exchanger and following shell-and-tube heat exchanger with two pipe heat exchangers; Be provided with U-shaped tubular type tubulation in the last shell-and-tube heat exchanger, U-shaped tubular type tubulation one end is communicated with LNG tank 1, and the other end is communicated with gasifier 2; Be provided with U-shaped tubular type tubulation in the following shell-and-tube heat exchanger, U-shaped tubular type tubulation one end is communicated with ice machine 4 by glycol water centrifugal pump 5, and the other end is communicated with ice machine 4 by pipeline; Running water pipe is communicated with ice machine 4, and the pipeline of connection is provided with water centrifugal pump 6; The U-shaped tubular type tubulation of last shell-and-tube heat exchanger is provided with refrigerant R404A outward; Be provided with glycol water in the U-shaped tubular type tubulation in the following shell-and-tube heat exchanger.
LNG and gas phase R404A carry out heat exchange in the last shell-and-tube heat exchanger, adopt the shell-and-tube heat exchange, and LNG walks tube side, and gas phase R404A is at shell side.Liquid phase R404A and mass concentration are that 30% glycol water carries out heat exchange in the following shell-and-tube heat exchanger, the heat exchange of employing shell-and-tube, and inside is U-shaped tubular type tubulation, and 30% glycol water is walked tube side, and liquid phase R404A is at shell side.The diameter that distributing on the central dividing plate is the circular hole of 3～5mm, percent opening is 10%～15%, circular hole is equilateral triangle and arranges, under this parameter designing, R404A gas phase flow rate and liquid phase flow rate can reach a poised state, guarantee R404A steadily heat exchange in the housing of last shell-and-tube heat exchanger and following shell-and-tube heat exchanger, and resistance minimum in the whole process.In the housing of last shell-and-tube heat exchanger, temperature reduces liquefy after gaseous state R404A and the LNG heat exchange, rely on self gravitation, drainage by the aperture above the dividing plate, enter down in the housing of shell-and-tube heat exchanger, become gaseous state with the glycol water heat exchange, turn in the housing of shell-and-tube heat exchanger, finish circulating.This utilizes and does not need extra plant equipment to promote the R404A refrigerant in the device of cold energy of liquefied natural gas ice making to flow, belong to automatic cycle heat exchange.For the terminal device that the ice machine of 10～20 tons/day of ice making capacities discharges as the LNG cold energy, the addition of R404A can be 2000kg in the double type heat exchanger of the present invention.
On last shell-and-tube heat exchanger and following shell-and-tube heat exchanger, the temperature and pressure sensor is housed all, the temperature and pressure sensor of last shell-and-tube heat exchanger is contained in the heat exchanger top apart from end socket 30cm place, right side, and the temperature and pressure sensor of following shell-and-tube heat exchanger is contained in the heat exchanger lowermost end apart from end socket 30cm place, right side.Can control the phase variable of R404A by the amount of coordinating control LNG and glycol water.The shell internal pressure is a sensitive parameter, be strict controlled in 0.2MPa, when the shell internal pressure of last shell-and-tube heat exchanger greater than 0.2MPa or temperature Gao Yu ?22 ℃ the time, illustrating needs the gas phase R404A of heat exchange to increase, the LNG quantity not sufficient, its pressure sensor or pressure sensor will be given the LNG liquid flowing valve with pressure signal transmission, increase the LNG flow; Otherwise, then reduce the LNG flow.Equally, instantly in the shell of shell-and-tube heat exchanger during 22 ℃ of little Yu of temperature ?, illustrate that the cold energy that low temperature liquid phase R404A carries is too much, its temperature sensor will increase flow with temperature signal to flow control valve on the glycol water pipeline; Otherwise, then reduce the ethylene glycol flow.
Gas-liquid phase transition takes place and is easy to control in R404A, and is highly sensitive, cooperated the integrated design of heat exchanger well, by temperature, pressure between strict control shell, guarantees that R404A carries out heat exchange at shell side stably in heat transfer process; The R404A freezing point is lower, and in heat transfer process, the difficult phenomenon of freezing makes operation be easy to control more; The R404A thermal capacitance is bigger, and heat exchange efficiency is higher.
The present invention relies on the character of the temperature, pressure sensitivity of R404A, by strictness control temperature, pressure, allows its R404A steadily transform between the gas-liquid phase.Utilize in the device ice-making process of cold energy of liquefied natural gas ice making ?162～?160 ℃, 0.3～0.5MPa, the LNG of 230～460kg/h comes out to enter the last shell-and-tube heat exchanger of double type heat exchanger 3 in LNG tank 1, with Qi Tai ?20 ℃, 0.3MPa, the R404A heat exchange of 960～1920kg/h, the LNG temperature rises high to 20 ℃ of ?25～?, enters gas distributing system after gasifier heats up; On the double type heat exchanger in the shell-and-tube heat exchanger, R404A temperature Jiang Di Zhi ?22 ℃, by the gaseous state liquefy, liquid R404A relies on self gravitation, in dividing plate with holes enters down the shell-and-tube heat exchanger housing; In following shell-and-tube heat exchanger, after liquid R404A and the glycol water heat exchange temperature Sheng Gao Dao ?20 ℃, be the gaseous state rising, in dividing plate with holes entered the shell-and-tube heat exchanger housing, circulation was finished in the R404A of gaseous state and LNG heat exchange again; ?22 ℃, 0.3MPa, the R404A Yu of 960～1920kg/h ?7 ℃～?5 ℃, 0.2～0.3MPa, 5600 ?glycol water heat exchange in following shell-and-tube heat exchanger of 11200kg/h; The temperature Jiang Di Zhi of glycol water ?15～?13 ℃, enter ice-maker makes ice, after the water heat exchange of glycol water and ice machine temperature Sheng Gao Dao ?7～?5 ℃, pump to down the shell-and-tube heat exchanger housing through glycol water centrifugal pump 5, finish circulation.According to the cold that LNG and refrigerant offer, regulate the flow of running water, under the LNG of 230～460kg/h amount of vaporization, can make every day ice for 10t～20t(by 24h).
The terminal device that present embodiment adopts the ice machine of 10～20 tons/day of ice making capacities to discharge as the LNG cold energy.?162 ℃, 0.3MPa, the LNG of 230kg/h come out to enter in LNG tank 1 on the double type heat exchanger 3 shell-and-tube heat exchanger, with Qi Tai ?20 ℃, 0.3MPa, the R404A heat exchange of 965kg/h, the LNG temperature rises high to 25 ℃ of ?, enters gas distributing system after gasifier 2 heats up.On double type heat exchanger 3 in the shell-and-tube heat exchanger, R404A temperature Jiang Di Zhi ?22 ℃, by the gaseous state liquefy, liquid R404A relies on self gravitation, in dividing plate with holes enters down the shell-and-tube heat exchanger housing, in following shell-and-tube heat exchanger, after liquid R404A and the glycol water heat exchange temperature Sheng Gao Dao ?20 ℃, be gaseous state and rise, again in dividing plate with holes enters the shell-and-tube heat exchanger housing, circulation is finished in the R404A of gaseous state and LNG heat exchange.?22 ℃, 0.3MPa, the R404A Yu of 965kg/h ?6 ℃, 0.2MPa, the heat exchange in shell-and-tube heat exchanger down of 30% the glycol water of 5600kg/h.The temperature Jiang Di Zhi of glycol water ?15 ℃ of ?15 ℃ glycol water enter ice machine, be used for ice making, after the ice making glycol water temperature Sheng Gao Dao ?6 ℃, pump to down the shell-and-tube heat exchanger housing through glycol water centrifugal pump 5, finish circulation.Under the LNG of 230kg/h amount of vaporization, can make ice every day is that 10t(is by 24h).
The terminal device that present embodiment adopts the ice machine of 10～20 tons/day of ice making capacities to discharge as the LNG cold energy.?160 ℃, 0.4MPa, the LNG of 286kg/h come out to enter in LNG tank 1 on the double type heat exchanger 3 shell-and-tube heat exchanger, with Qi Tai ?20 ℃, 0.3MPa, the R404A heat exchange of 1190kg/h, the LNG temperature rises high to 25 ℃ of ?, enters gas distributing system after gasifier 2 heats up.On double type heat exchanger 3 in the shell-and-tube heat exchanger, R404A temperature Jiang Di Zhi ?22 ℃, by the gaseous state liquefy, liquid R404A relies on self gravitation, in dividing plate with holes enters down the shell-and-tube heat exchanger housing, in following shell-and-tube heat exchanger, after liquid R404A and the glycol water heat exchange temperature Sheng Gao Dao ?20 ℃, be gaseous state and rise, again in dividing plate with holes enters the shell-and-tube heat exchanger housing, circulation is finished in the R404A of gaseous state and LNG heat exchange.?22 ℃, 0.3MPa, the R404A Yu of 1190kg/h ?6 ℃, 0.2MPa, the heat exchange in shell-and-tube heat exchanger down of 30% the glycol water of 7500kg/h.The temperature Jiang Di Zhi of glycol water ?14 ℃ ， ?14 ℃ glycol water enter ice machine, be used for ice making, after the ice making glycol water temperature Sheng Gao Dao ?6 ℃, finish circulation.Under the LNG of 286kg/h amount of vaporization, can make ice every day is that 12.7t(is by 24h).
The terminal device that present embodiment adopts the ice machine of 10～20 tons/day of ice making capacities to discharge as the LNG cold energy.?160 ℃, 0.3MPa, the LNG of 342kg/h come out to enter in LNG tank 1 on the double type heat exchanger 3 shell-and-tube heat exchanger, with Qi Tai ?20 ℃, 0.3MPa, the R404A heat exchange of 1440kg/h, the LNG temperature rises high to 25 ℃ of ?, enters gas distributing system after gasifier 2 heats up.On double type heat exchanger 3 in the shell-and-tube heat exchanger, R404A temperature Jiang Di Zhi ?22 ℃, by the gaseous state liquefy, liquid R404A relies on self gravitation, in dividing plate with holes enters down the shell-and-tube heat exchanger housing, in following shell-and-tube heat exchanger, after liquid R404A and the glycol water heat exchange temperature Sheng Gao Dao ?20 ℃, be gaseous state and rise, again in dividing plate with holes enters the shell-and-tube heat exchanger housing, circulation is finished in the R404A of gaseous state and LNG heat exchange.?22 ℃, 0.3MPa, the R404A Yu of 1440kg/h ?5 ℃, 0.2MPa, the heat exchange in shell-and-tube heat exchanger down of 30% the glycol water of 8850kg/h.The temperature Jiang Di Zhi of glycol water ?13 ℃ of ?13 ℃ glycol water enter ice machine, be used for ice making, after the ice making glycol water temperature Sheng Gao Dao ?5 ℃, pump to down the shell-and-tube heat exchanger housing through glycol water centrifugal pump 5, finish circulation.Under the LNG of 342kg/h amount of vaporization, can make ice every day is that 14.8t(is by 24h).
The terminal device that present embodiment adopts the ice machine of 10～20 tons/day of ice making capacities to discharge as the LNG cold energy.?161 ℃, 0.3MPa, the LNG of 398kg/h come out to enter in LNG tank 1 on the double type heat exchanger 3 shell-and-tube heat exchanger, with Qi Tai ?20 ℃, 0.3MPa, the R404A heat exchange of 1680kg/h, the LNG temperature rises high to 25 ℃ of ?, enters gas distributing system after gasifier 2 heats up.On double type heat exchanger 3 in the shell-and-tube heat exchanger, R404A temperature Jiang Di Zhi ?22 ℃, by the gaseous state liquefy, liquid R404A relies on self gravitation, in dividing plate with holes enters down the shell-and-tube heat exchanger housing, in following shell-and-tube heat exchanger, after liquid R404A and the glycol water heat exchange temperature Sheng Gao Dao ?20 ℃, be gaseous state and rise, again in dividing plate with holes enters the shell-and-tube heat exchanger housing, circulation is finished in the R404A of gaseous state and LNG heat exchange.?22 ℃, 0.3MPa, the R404A Yu of 1680kg/h ?5 ℃, 0.2MPa, the heat exchange in shell-and-tube heat exchanger down of 30% the glycol water of 10050kg/h.The temperature Jiang Di Zhi of glycol water ?14 ℃ of ?14 ℃ glycol water enter ice machine, be used for ice making, after the ice making glycol water temperature Sheng Gao Dao ?5 ℃, pump to down the shell-and-tube heat exchanger housing through glycol water centrifugal pump 5, finish circulation.Under the LNG of 398kg/h amount of vaporization, can make ice every day is that 17.2t(is by 24h).
The terminal device that present embodiment adopts the ice machine of 10～20 tons/day of ice making capacities to discharge as the LNG cold energy.?162 ℃, 0.5MPa, the LNG of 460kg/h come out to enter in LNG tank 1 on the double type heat exchanger 3 shell-and-tube heat exchanger, with Qi Tai ?20 ℃, 0.3MPa, the R404A heat exchange of 1950kg/h, the LNG temperature rises high to 25 ℃ of ?, enters gas distributing system after gasifier 2 heats up.On double type heat exchanger 3 in the shell-and-tube heat exchanger, R404A temperature Jiang Di Zhi ?22 ℃, by the gaseous state liquefy, liquid R404A relies on self gravitation, in dividing plate with holes enters down the shell-and-tube heat exchanger housing, in following shell-and-tube heat exchanger, after liquid R404A and the glycol water heat exchange temperature Sheng Gao Dao ?20 ℃, be gaseous state and rise, with the LNG heat exchange, finish circulation.?22 ℃, 0.3MPa, the R404A Yu of 1950kg/h ?6 ℃, 0.2MPa, the heat exchange in shell-and-tube heat exchanger down of 30% the glycol water of 11250kg/h.The temperature Jiang Di Zhi of glycol water ?15 ℃ of ?15 ℃ glycol water enter ice machine, be used for ice making, after the ice making glycol water temperature Sheng Gao Dao ?6 ℃, pump to down the shell-and-tube heat exchanger housing through glycol water centrifugal pump 5, finish circulation.Under the LNG of 460kg/h amount of vaporization, can make ice every day is that 20t(is by 24h).
According to the design of this process unit, gross investment is 1,980,000 yuan, and the technology investment estimating table sees Table 1.By regulating the flow of LNG, by the ice that makes 15t/d, 1 ton of ice is pressed 120 yuan of sales, 40.6 ten thousand yuan of year economize on electricity benefits, and a year ice making income is 65.7 ten thousand yuan, the investment payback time is 4.65.
Claims (6)
1. device that utilizes the cold energy of liquefied natural gas ice making, it is characterized in that comprising LNG tank, gasifier, bivalve pass heat exchanger, ice machine, glycol water from, the diameter that distributing on the dividing plate with holes is the circular hole of 3～5mm, the percent opening of dividing plate with holes is 10%～15%, heart pump and water centrifugal pump; Dividing plate with holes is split up into shell-and-tube heat exchanger and following shell-and-tube heat exchanger with two pipe heat exchangers; Be provided with U-shaped tubular type tubulation in the last shell-and-tube heat exchanger, U-shaped tubular type tubulation one end is communicated with LNG tank, and the other end is communicated with gasifier; Be provided with U-shaped tubular type tubulation in the following shell-and-tube heat exchanger, U-shaped tubular type tubulation one end is communicated with ice machine by the glycol water centrifugal pump, and the other end is communicated with ice machine by pipeline; Running water pipe is communicated with ice machine, and the pipeline of connection is provided with the water centrifugal pump; The U-shaped tubular type tubulation of last shell-and-tube heat exchanger is provided with refrigerant R404A outward; Be provided with glycol water in the U-shaped tubular type tubulation in the following shell-and-tube heat exchanger.
2. the device that utilizes the cold energy of liquefied natural gas ice making according to claim 1 is characterized in that: the circular hole on the described dividing plate with holes is equilateral triangle and arranges.
3. the device that utilizes the cold energy of liquefied natural gas ice making according to claim 1, it is characterized in that: the mass concentration of described glycol water is 30%.
4. the device that utilizes the cold energy of liquefied natural gas ice making according to claim 1 is characterized in that: on described upward shell-and-tube heat exchanger and the following shell-and-tube heat exchanger temperature and pressure sensor is housed all.
5. the device that utilizes the cold energy of liquefied natural gas ice making according to claim 1 is characterized in that: the described temperature and pressure sensor of going up shell-and-tube heat exchanger is contained in the heat exchanger top apart from end socket 30cm place, right side; The described temperature and pressure sensor of shell-and-tube heat exchanger down is contained in the heat exchanger lowermost end apart from end socket 30cm place, right side.
6. what application rights required 1 ?, 5 each described devices utilizes cold energy of liquefied natural gas ice making technology, it is characterized in that: ?162～?160 ℃, 0.3～0.5MPa, the LNG of 230～460kg/h comes out to enter in LNG tank on the double type heat exchanger the shell-and-tube heat exchanger, with Qi Tai ?20 ℃, 0.3MPa, the R404A heat exchange of 960～1920kg/h, the LNG temperature rises high to 20 ℃ of ?25～?, enters gas distributing system after gasifier heats up; On the double type heat exchanger in the shell-and-tube heat exchanger, R404A temperature Jiang Di Zhi ?22 ℃, by the gaseous state liquefy, liquid R404A relies on self gravitation, in dividing plate with holes enters down the shell-and-tube heat exchanger housing; In following shell-and-tube heat exchanger, after liquid R404A and the glycol water heat exchange temperature Sheng Gao Dao ?20 ℃, be the gaseous state rising, in dividing plate with holes entered the shell-and-tube heat exchanger housing, circulation was finished in the R404A of gaseous state and LNG heat exchange again; ?22 ℃, 0.3MPa, the R404A Yu of 960～1920kg/h ?7 ℃～?5 ℃, 0.2～0.3MPa, 5600 ?glycol water heat exchange in following shell-and-tube heat exchanger of 11200kg/h; The temperature Jiang Di Zhi of glycol water ?15～?13 ℃, enter ice-maker makes ice, after the water heat exchange of glycol water and ice machine temperature Sheng Gao Dao ?7～?5 ℃, pump to down the shell-and-tube heat exchanger housing through the glycol water centrifugal pump, finish circulation.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104154416A (en) * | 2014-07-29 | 2014-11-19 | 浙江润祁节能科技有限公司 | Ice storage method and device comprising an atmospheric tower and utilizing cold energy of LNG |
| CN104748474A (en) * | 2015-03-23 | 2015-07-01 | 华南理工大学 | Heat exchanging method of liquid natural gas cold energy used for high-temperature-level cold energy user |
| CN113686069A (en) * | 2021-08-31 | 2021-11-23 | 骊阳(广东)节能科技股份有限公司 | LNG cold energy recovery ice making system and method |
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| WO2023123268A1 (en) * | 2021-12-30 | 2023-07-06 | 合肥华凌股份有限公司 | Ice making assembly and ice making control method and apparatus thereof, and refrigeration device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104154416A (en) * | 2014-07-29 | 2014-11-19 | 浙江润祁节能科技有限公司 | Ice storage method and device comprising an atmospheric tower and utilizing cold energy of LNG |
| CN104154416B (en) * | 2014-07-29 | 2015-12-30 | 浙江润祁节能科技有限公司 | A kind of ice-reserving method and device of utilizing cold energy of liquefied natural gas with atmospheric tower |
| CN104748474A (en) * | 2015-03-23 | 2015-07-01 | 华南理工大学 | Heat exchanging method of liquid natural gas cold energy used for high-temperature-level cold energy user |
| CN113686069A (en) * | 2021-08-31 | 2021-11-23 | 骊阳(广东)节能科技股份有限公司 | LNG cold energy recovery ice making system and method |
| WO2023123260A1 (en) * | 2021-12-30 | 2023-07-06 | 合肥华凌股份有限公司 | Ice-making assembly and refrigeration apparatus |
| WO2023123267A1 (en) * | 2021-12-30 | 2023-07-06 | 合肥华凌股份有限公司 | Ice-making assembly, ice making control method and device, and refrigeration apparatus |
| WO2023123268A1 (en) * | 2021-12-30 | 2023-07-06 | 合肥华凌股份有限公司 | Ice making assembly and ice making control method and apparatus thereof, and refrigeration device |
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