LNG (Liquefied Natural Gas) cold energy saline water ice making device and method

Abstract

The invention discloses an LNG cold energy brine ice making device and method. The LNG cold energy brine ice making device comprises an LNG gasification system, a cold energy recovery system, an ice making and storing system and an ice unloading system. According to the LNG gasification system, LNG is gasified after exchanging heat with a refrigerant, and the refrigerant is cooled and enters the cold energy recovery system. In the cold energy recovery system, saline water exchanges heat with a low-temperature refrigerant and then is cooled to circularly supply cold to the ice-making and ice-storing system; according to the ice making and storing system, ice making water in an ice mold exchanges heat with low-temperature saline water in an ice making pool to be cooled to form ice blocks, the ice blocks are stored in the ice making pool when the ice does not need to be discharged, and integration of ice making and ice storage is achieved; according to the de-icing system, de-icing is carried out on an ice mold filled with ice blocks through a de-icing pool. Saline water ice making is carried out through LNG cold energy, energy saving and consumption reduction are achieved, and the ice block quality is improved; the device has the advantages of being high in automation degree, long in service life, small in occupied area, low in investment cost, high in cold energy utilization rate, high in ice making efficiency and the like.

Description

Technical Field

[0001] The invention relates to the technical field of brine ice making, and in particular to an LNG cold energy brine ice making device and method. Background Art

[0002] In the ice-making industry, the traditional and common method of making ice is to use brine. Most of the brine ice-making methods are to place an ice bucket made of galvanized steel plates into a brine pool, and use a refrigeration system to reduce the temperature of the brine to below zero degrees. The low-temperature brine exchanges heat with the water in the ice bucket through the wall of the ice bucket, causing the water in the ice bucket to gradually solidify into ice. The ice bucket is then lifted by a lifting device and placed in a normal temperature water pool to separate the ice cubes from the wall of the ice bucket. Finally, the ice cubes are poured out for storage.

[0003] The ice cubes made by the traditional brine ice-making method are solid, not easy to melt, and easy to store and transport. However, this ice-making method uses a compressor for refrigeration, and the overall energy consumption of the system is relatively high; the ice-making speed is relatively slow, requiring a long ice-making time, and it is an open refrigerant system. The brine is in direct contact with the air, which easily dilutes the brine and causes large heat losses; brine is highly corrosive and has a corrosive effect on both ice buckets and brine pools; after ice making is completed, the defrosting time is long, and both ice production and ice storage require manual operation, the operating process is complicated, and the ice production and ice storage speeds are slow; an additional ice storage warehouse is required for ice storage, which occupies a large area and has high investment costs.

[0004] Chinese utility model patent CN 210718247 U discloses a brine ice-making energy-efficient chiller, which provides cooling for an ice-making pool by refrigerating with a refrigeration compressor, and can produce ice cubes that meet standards. However, this cooling method requires the use of municipal electricity for operation, resulting in high energy consumption and low economic benefits.

[0005] Chinese invention patent CN 108151386 A discloses a brine ice-making refrigeration system and operation method. In this solution, after the ice-making water forms solid ice, it is lifted by a bracket of an ice-making bucket. This process requires manual operation and lacks automatic control for automatically detecting the quality of ice cubes and transferring ice cubes. The overall degree of automation is low. In this solution, a deicing pool is set for deicing, and deicing water is injected by connecting the inlet and outlet of the condenser, which effectively utilizes excess energy. However, no temperature detector and liquid level sensor are set in the deicing pool. When the temperature of the deicing water in the deicing pool decreases after multiple deicing operations, the deicing time is too long. In addition, the lack of a liquid level sensor will make it impossible to judge the liquid level height when the deicing pool is in and out of the water. When the liquid level is too high, the deicing water will overflow during the deicing process. When the liquid level is too low, the ice mold cannot be completely immersed, resulting in a long deicing time. Summary of the invention

[0006] In order to solve at least one of the problems existing in the prior art, the present invention provides an LNG cold energy brine ice making device and method, which uses LNG cold energy to make brine ice, achieves energy saving and consumption reduction, and improves the quality of ice cubes.

[0007] The present invention provides a method and device for making ice from LNG cold energy brine, comprising:

[0008] The LNG gasification system is used for gasification of LNG to release the cold energy contained in LNG; the LNG gasification system comprises an LNG storage tank and a first heat exchanger; the input end of the first heat exchanger is connected to the output end of the LNG storage tank;

[0009] The cold energy recovery system is used to recover the cold energy generated by LNG gasification and supply cold to the ice-making and ice-storage system; the cold energy recovery system includes a brine buffer tank and a second heat exchanger, the input end of the brine buffer tank is connected to the output end of the ice-making and ice-storage system; the tube-side input end of the second heat exchanger is connected to the shell-side output end of the first heat exchanger; the shell-side input end of the second heat exchanger is connected to the output end of the brine buffer tank; the tube-side output end of the second heat exchanger is connected to the shell-side input end of the first heat exchanger; the shell-side output end of the second heat exchanger is connected to the input end of the ice-making and ice-storage system;

[0010] The ice making and ice storage system is used to complete ice making and ice storage; the ice making and ice storage system includes a water separator, an ice making pool, an ice mold, a water collector, and a water adder; the input end of the water separator is connected to the shell side output end of the second heat exchanger; the ice making pool is used for making and storing ice cubes, and the input end of the ice making pool is connected to the output end of the water separator; the ice mold is located inside the ice making pool; the input end of the water collector is connected to the output end of the ice making pool, and the water adder is used to add water to the ice mold;

[0011] The de-icing system is used for de-icing after the ice is made; the de-icing system includes an infrared temperature detector, an ice quality detector, an ice mold lifter controller, an ice mold lifter and an de-icing pool; the infrared temperature detector is used to monitor the temperature of the ice mold; the infrared temperature detector is connected to the ice quality detector; the ice mold lifter is located above the ice mold and can be translated and raised and lowered at the positions of the ice making and ice storage system and the de-icing system, and the ice mold lifter can be connected to the ice mold; the ice quality detector is used to determine whether the temperature difference of the ice in the ice mold meets the set standard and to perform ice making timing; the ice mold lifter controller is connected to the ice quality detector and the ice mold lifter; the de-icing pool is used to de-ice the water mold, and the output end of the de-icing pool is connected to the input end of the water adder.

[0012] As a further improvement of the technical solution of the present invention, the LNG gasification system also includes a reheater, a pressure regulator and a meter; the reheater, the pressure regulator and the meter are connected in sequence, and the input end of the reheater is connected to the pipe side output end of the first heat exchanger.

[0013] As a further improvement of the technical solution of the present invention, a first regulating valve is provided between the LNG storage tank and the first heat exchanger to regulate the LNG flow; a second regulating valve is provided between the reheater and the pressure regulator to regulate the natural gas flow.

[0014] As a further improvement of the technical solution of the present invention, the heat exchange medium of the first heat exchanger is propane, and heat is exchanged between LNG and propane. After the temperature of the propane is reduced, it enters the second heat exchanger for heat exchange.

[0015] As a further improvement of the technical solution of the present invention, the heat exchange medium of the second heat exchanger is brine, and propane exchanges heat with the brine. After the brine temperature is reduced, it enters the ice making and ice storage system to supply cold energy.

[0016] As a further improvement of the technical solution of the present invention, the brine buffer tank is used to stabilize the brine level of the ice making pool; a concentration detector and a rotatable agitator are provided inside the brine buffer tank; a stirring motor is connected to the agitator and the concentration detector, and the concentration detector is used to monitor the brine concentration in the brine buffer tank.

[0017] When recycling cold energy, the brine buffer tank with an agitator can timely and effectively control the brine concentration to be uniform and stable, maintain the brine concentration and ensure the brine's cooling performance.

[0018] As a further improvement on the technical solution of the present invention, the ice molds in the ice-making pool have multiple rows and columns, and the water divider is used to supply low-temperature brine to the ice-making pool to ensure that the temperature of the low-temperature brine entering the ice-making pool is consistent, so that the ice cubes in the same column of the ice molds are completed at the same time, thereby achieving the effect of continuous batch ice making.

[0019] As a further improvement of the technical solution of the present invention, the ice-making pool is used for making and storing ice cubes; ice making and ice storage are integrated, and less floor space is occupied; the ice-making pool is spliced ​​by PP plates, covered by steel plates, and supported by I-beams, so as to achieve heat insulation and reduce cold energy loss while avoiding salt water corrosion, thereby extending the service life of the ice-making pool and reducing the cost of the ice-making pool.

[0020] As a further improvement of the technical solution of the present invention, the ice making and ice storage system also includes a conveyor, which is located at the bottom of the ice mold and is used to achieve the movement of the ice mold in the ice making pool.

[0021] The unfinished ice molds can be transferred to the low-temperature end by a conveyor for countercurrent heat exchange with brine, thereby improving heat exchange efficiency and shortening ice making time.

[0022] As a further improvement of the technical solution of the present invention, the ice making and ice storage system also includes an ice making device bracket, the ice mold lifter includes an ice mold lifter motor, an ice mold hook traction rope and a connecting piece, the ice mold lifter motor is slidably arranged on the top of the ice making device bracket and is located above the ice making and ice storage system and the ice removing system, the ice mold hook traction rope and the output end of the ice mold lifter motor are used to release and extend or retract and shorten the ice mold hook traction rope, the connecting piece is connected to the ice mold hook traction rope, and the connecting piece is used to connect to the ice mold.

[0023] Preferably, the connecting member is a hook.

[0024] As a further improvement of the technical solution of the present invention, the ice mold lifter also includes a pulley and a motor fixing rod. Pullies are slidably arranged at both ends of the top of the ice making device bracket, and the two ends of the motor fixing rod are respectively connected to the pulleys at the two ends of the ice making device bracket, and the ice mold lifter motor is fixed on the motor fixing rod.

[0025] As a further improvement of the technical solution of the present invention, the de-icing pool is provided with a first liquid level sensor, a second liquid level sensor, a temperature detector, a de-icing pool water inlet valve, and a de-icing pool water outlet valve; the de-icing pool is provided with a first liquid level sensor, a second liquid level sensor, a temperature detector, a de-icing pool water inlet valve, and a de-icing pool water outlet valve; the temperature detector is used to monitor the temperature of the liquid in the de-icing pool; the first liquid level sensor and the second liquid level sensor are respectively located at different height positions of the de-icing pool, and are used to monitor the liquid level heights at different positions.

[0026] The deicing water can automatically change the stable deicing temperature in time through temperature detection and valve control, thus improving the deicing efficiency of the ice mold. The deicing pool liquid level sensor controls the inlet and outlet of deicing water to ensure safe operation.

[0027] Preferably, the temperature detector is located in the middle of the de-icing pool; the first liquid level sensor and the second liquid level sensor are respectively located at the upper and lower ends of the inner side of the de-icing pool; the de-icing pool water inlet valve is located in the middle of the outer side of the de-icing pool; and the de-icing pool water outlet valve is located at the lower end of the outer side of the de-icing pool.

[0028] A method for making ice using LNG cold energy brine, comprising the following steps:

[0029] LNG from the LNG storage tank enters the first heat exchanger to exchange heat with the refrigerant;

[0030] Ice-making water is added to the empty ice mold through the water adder. At the same time, the low-temperature refrigerant from the tube side of the first heat exchanger enters the second heat exchanger to exchange heat with the brine. After the temperature of the low-temperature refrigerant increases, it circulates into the tube side of the first heat exchanger. The brine cools down and enters the water distributor. The low-temperature brine enters the ice-making pool through the water distributor to cool the ice-making water in the ice mold. The temperature of the ice-making water decreases to form ice cubes. The temperature of the low-temperature brine increases and enters the brine buffer tank through the water collector. The brine with uniform concentration in the brine buffer tank enters the shell side of the second heat exchanger to exchange heat with the refrigerant, and the cycle is repeated.

[0031] After the ice cubes in the ice mold are made, the ice mold lifter is started by the ice mold lifter controller, the ice mold lifter moves to the top of the ice mold that has completed ice making, then moves the ice mold that has completed ice making to the top of the ice defrosting pool, and puts the ice mold that has completed ice making into the ice defrosting pool for defrosting operation; after the ice cubes inside the ice mold are removed, an empty ice mold is formed, the empty ice mold is lifted by the ice mold lifter and moved to the water adder, and the water adder adds water to the empty ice mold; after the empty ice mold is filled with water, it is moved to the vacant position of the ice making pool by the ice mold lifter to make ice, and the ice mold lifter returns to the initial position, and the cycle is repeated.

[0032] Furthermore, the method further comprises the steps of:

[0033] The ice mold filled with ice cubes is defrosted in the deicing pool. When the temperature of the deicing water in the deicing pool decreases, the data signal of the temperature detector is converted into an electrical signal to start the deicing pool outlet valve. The low-temperature deiced water enters the water adder through the deicing pool outlet valve to add water to the empty ice mold. When the liquid level of the low-temperature deiced water in the deicing pool drops to the position of the first liquid level sensor, the deicing pool inlet valve is started to add normal-temperature deiced water into the deicing pool. When the liquid level of the normal-temperature deiced water in the deicing pool rises to the position of the second liquid level sensor, the deicing pool inlet valve is closed, and the cycle is automatically repeated.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] The present invention can realize the integration of ice making and ice storage, can reduce the occupied area, and reduce the production cost; the ice quality detection and mobile ice-shedding joint control in the present invention reduce the difficulty of ice transfer and ice-shedding operation, can improve the automation degree of the device, and reduce manpower consumption; the present invention can effectively solve the problems of low automation degree, short service life, long ice making and ice-shedding time, low heat exchange efficiency, and large occupied area during operation; the composition of the device used in the present invention is basically the basic infrastructure produced on the market, which is cheap, simple to produce and process, and easy to maintain and replace. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic diagram of the structure of an LNG cold energy brine ice making device provided in an embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of the concentration control of the brine buffer tank according to an embodiment of the present invention;

[0038] Figure 3 This is a schematic diagram of an ice removal system according to an embodiment of the present invention;

[0039] Figure 4 This is a schematic diagram of ice quality detection according to an embodiment of the present invention;

[0040] Figure 5 This is a schematic diagram of deicing water replacement control in a deicing pool according to an embodiment of the present invention;

[0041] Figure 6 Schematic diagram of an ice making and storage system according to an embodiment of the present invention.

[0042] In the figure: 1-LNG storage tank, 2-first regulating valve, 3-first heat exchanger, 4-reheater, 5-second regulating valve, 6-pressure regulator, 7-meter, 8-second heat exchanger, 9-water distributor, 10-conveyor, 11-ice making pool, 12-ice mold, 13-water collector, 14-brine buffer tank, 15-stirring motor, 16-stirring machine, 17-concentration detector, 18-water adder, 19-brine pump, 20-infrared temperature detector, 21-ice quality detector, 22-ice mold lifter controller, 23-ice mold lifter, 24-ice making device bracket, 25-temperature detector, 26-de-ice pool outlet valve, 27-first liquid level sensor, 28-de-ice pool inlet valve, 29-second liquid level sensor, 30-de-ice pool. DETAILED DESCRIPTION

[0043] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The exemplary embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0044] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, upper end, lower end, top, bottom...) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0045] In the present invention, unless otherwise clearly defined and limited, the term "connection" should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features; in addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0047] like Figures 1 to 6 As shown, the present invention provides an LNG cold energy brine ice making device, comprising:

[0048] LNG gasification system, the LNG gasification system is used for gasification of LNG to release a large amount of cold energy contained in LNG; the LNG gasification system comprises an LNG storage tank 1, a first heat exchanger 3 and a recuperator 4, the input end of the first heat exchanger 3 is connected to the output end of the LNG storage tank 1; the input end of the recuperator 4 is connected to the pipe-side output end of the first heat exchanger 3;

[0049] A cold energy recovery system, which is used to recover the cold energy generated by LNG gasification and supply cold to the ice-making and ice-storage system; the cold energy recovery system includes a brine buffer tank 14, a brine pump 19, and a second heat exchanger 8; the brine buffer tank 14 is used to stabilize the brine liquid level of the ice-making pool 11 in the ice-making and ice-storage system, and the input end of the brine buffer tank 14 is connected to the output end of the ice-making and ice-storage system; the input end of the brine pump 19 is connected to the output end of the brine buffer tank 14; the tube-side input end of the second heat exchanger 8 is connected to the shell-side output end of the first heat exchanger 3, and the shell-side input end of the second heat exchanger 8 is connected to the output end of the brine pump 19; the tube-side output end of the second heat exchanger 8 is connected to the shell-side input end of the first heat exchanger 3; the shell-side output end of the second heat exchanger 8 is connected to the input end of the water separator 9 of the ice-making and ice-storage system;

[0050] Ice making and ice storage system, the ice making and ice storage system is used to complete ice making and play an ice storage function at the same time; the ice making and ice storage system includes a water distributor 9, an ice making pool 11, an ice mold 12, a conveyor 10, a water collector 13, and a water adder 18; the input end of the water adder 18 is connected to the output end of the de-icing pool 30 of the de-icing system; the input end of the water distributor 9 is connected to the output end of the shell side of the second heat exchanger 8; the input end of the ice making pool 11 is connected to the output end of the water distributor 9; the ice mold 12 is located inside the ice making pool 11, and the conveyor 10 is located at the bottom of the ice mold 12, which is used to push the ice mold 12 in the ice making pool 11; the input end of the water collector 13 is connected to the output end of the ice making pool 11. The water distributor 9 mainly distributes water evenly to the ice making pool 11 to ensure that the temperature of the low-temperature brine entering the ice making pool 11 is the same, such as -20°C, to achieve simultaneous batch production of ice cubes. The ice making pool 11 is used for making and storing ice cubes, realizing integrated ice making and ice storage, and occupying less space;

[0051] An ice-defrosting system is provided, wherein the ice-defrosting system is used for defrosting ice after ice making is completed; the ice-defrosting system comprises an infrared temperature detector 20, an ice quality detector 21, an ice mold lifter controller 22, an ice mold lifter 23, an ice-making device bracket 24 and an ice-defrosting pool 30; the infrared temperature detector 20 is arranged on the outside of the ice mold 12; the infrared temperature detector 20 is connected to the ice quality detector 21, the ice mold lifter 23 is connected to the top of the ice-making device bracket 24, and the vertical inner side of the ice-making device bracket 24 is connected to the horizontal outer side of the ice-making pool 11; the ice quality detector 21 is used to detect ice in the ice mold 12; the ice mold lifter controller 22 is connected to the ice quality detector 21 and the ice mold lifter 23 through a line.

[0052] The ice quality detector 21 includes an ice mold internal temperature detection module 21-1 and an ice making timing module 21-2. The ice mold internal temperature detection module is used to display the temperature and to determine whether the temperature difference reaches the set standard. The ice making timing module 21-2 is used to time the ice making time.

[0053] The present invention monitors the ice making situation at any time by setting an ice quality detector 21, and connects the ice mold lifter 23 for joint control. When the ice making is completed, the ice mold lifter 13 transfers the ice mold after ice making to the ice defrosting pool 30 for defrosting. Then, another ice mold lifter 23 transfers the empty ice mold to the ice making pool 11 for adding water to make ice. In this way, the degree of automation of the device can be improved, manpower consumption can be reduced, and continuous production can be achieved.

[0054] When ice making is completed and the ice mold has been transferred to the ice-removing pool 30 through the ice mold lifter 23, the conveyor 10 starts to move the unfinished ice mold from the high-temperature end of the ice-making pool to the low-temperature end, so that the ice mold can form a countercurrent heat exchange with the brine, thereby improving the heat exchange efficiency and shortening the ice making time.

[0055] Specifically, in some embodiments of the present invention, the conveyor 10 is a plastic chain conveyor.

[0056] Specifically, in some embodiments of the present invention, a pressure regulator 6 and a meter 7 are further included; the pressure regulator 6 is connected to the reheater 4 and the meter 7. The pressure regulator 6 is used to adjust the pressure of the natural gas according to the pressure requirements of the downstream pipeline network to achieve safe and stable operation of the device; the gas meter is mainly used to measure and record the amount of gas passing through the pipeline, so as to accumulate the volume or mass of the gas passing through the pipeline, so as to facilitate the statistics of downstream gas usage.

[0057] Specifically, in some embodiments of the present invention, a first regulating valve 2 is provided between the LNG storage tank 1 and the first heat exchanger 3 to regulate the LNG flow rate; a second regulating valve 5 is provided between the reheater 4 and the pressure regulator 6 to regulate the natural gas flow rate. The regulating valve achieves the throttling effect on the fluid by changing the flow area between the valve core and the valve seat. When the fluid flows through the regulating valve, the flow area changes due to the movement or rotation of the valve core, and the flow rate and pressure also change accordingly, thereby achieving precise control of the fluid.

[0058] Specifically, in some embodiments of the present invention, the heat exchange medium of the first heat exchanger 3 is propane, but not limited to propane, and LNG is used to exchange heat with propane, and the propane temperature is reduced before entering the second heat exchanger 8 for heat exchange. Furthermore, the temperature of propane entering the first heat exchanger 3 is 5°C, and the temperature flowing out of the first heat exchanger 3 after heat exchange is -30°C.

[0059] Specifically, in some embodiments of the present invention, the heat exchange medium of the second heat exchanger 8 is brine, and propane is used to exchange heat with the brine. After the brine temperature is reduced, it enters the ice-making and ice-storage system to supply cold energy. Furthermore, the temperature of the brine entering the second heat exchanger 8 is 15°C, and the temperature of the brine flowing out after heat exchange in the second heat exchanger 8 is reduced to -23°C, and then the temperature of the brine entering the ice-making and ice-storage system to supply cold energy is increased to -10°C.

[0060] Specifically, in some embodiments of the present invention, a stirring motor 15, an agitator 16 and a concentration detector 17 are further included. The agitator 16 and the concentration detector 17 are arranged inside the brine buffer tank 14, and the stirring motor 15 is connected to the agitator 16 and the concentration detector 17. The stirring motor 15 controls the operation of the agitator 16, and avoids solid precipitation in the brine buffer tank 14 by stirring the brine, thereby ensuring that the brine concentration is uniform and stable. The concentration detector 17 is used to monitor the brine concentration in the brine buffer tank 14, so as to accurately adjust the solubility of the brine.

[0061] By setting up a brine buffer tank 14 with an agitator, when cold energy is recovered and utilized, the agitation of the agitator can timely and effectively control the brine concentration to be uniform and stable to avoid solid precipitation, and the brine concentration can be monitored at any time by the concentration detector 17 to ensure the brine cooling performance.

[0062] Specifically, in some embodiments of the present invention, the water separator 9 is used to supply low-temperature brine to the ice-making pool 11 to ensure that the temperature of the low-temperature brine entering the ice-making pool 11 is consistent, so that the ice cubes in the same row of the ice molds 12 are completed at the same time, thereby achieving the effect of continuous batch ice making.

[0063] Specifically, in some embodiments of the present invention, the ice pool 11 is formed by splicing PP plates, covered by steel plates, and supported by I-beams, so as to achieve heat insulation and reduce the loss of cold energy while avoiding salt water corrosion, thereby extending the service life of the ice pool and reducing the cost of the ice pool. Furthermore, the thickness of the PP plate is 5 mm, which ensures the structural strength of the ice pool and ensures the maximum possible utilization of cold energy, and the loss rate of the cold energy utilization process is reduced by 32%. By splicing PP plates, covering with steel plates, and supporting with I-beams, a stable structure can be formed, so as to achieve heat insulation and reduce the loss of cold energy while avoiding salt water corrosion, extending the service life, and using an integrated form of ice making and ice storage to occupy less space and reduce costs.

[0064] Specifically, in some embodiments of the present invention, when ice cubes are gradually formed in the ice mold 12, resulting in a gradual decrease in the temperature difference with the low-temperature brine, the conveyor 10 moves the ice mold 12 from the high-temperature end to the low-temperature end of the ice making pool 11, so that the ice mold 12 forms a countercurrent heat exchange with the low-temperature brine, thereby improving the heat exchange efficiency. Preferably, the moving speed of the plastic chain plate is 0.3 m / s, so as to ensure that the ice mold 12 moves at a uniform and stable speed.

[0065] Specifically, in some embodiments of the present invention, the ice mold lifter controller 22 controls the operation of the ice mold lifter 23, the ice mold lifter 23 is located above the ice mold 12, the ice mold lifter 23 includes an ice mold lifter motor 23-1, a pulley 23-2, an ice mold hook traction rope 23-3, and an ice mold hook 23-4, the ice mold lifter motor 23-1 is fixed on the motor fixing rod, and the two ends of the motor fixing rod are respectively connected to the pulley 23-2, the pulley 23-2 is slidably located at the top of the ice making device bracket 24, the ice mold hook traction rope 23-3 is connected to the ice mold hook 23-4, and the ice mold hook traction rope 23-3 is connected to the output end of the ice mold lifter motor 23-1, so as to release the extension or retract the shortened ice mold hook traction rope 23-3 through the ice mold lifter motor 23-1.

[0066] Specifically, in some embodiments of the present invention, the de-icing pool 30 is provided with a first liquid level sensor 27, a second liquid level sensor 29, a temperature detector 25, a de-icing pool water inlet valve 28, and a de-icing pool water outlet valve 26; the temperature detector 25 is located at the middle end of the de-icing pool 30; the first liquid level sensor 27 and the second liquid level sensor 29 are respectively located at the upper and lower ends of the outer wall of the de-icing pool 30; the de-icing pool water inlet valve 28 is located at the middle of the outer side of the de-icing pool 30; the de-icing pool water outlet valve 26 is located at the lower end of the outer side of the de-icing pool 30. The temperature detector 25 controls the opening of the de-icing pool water outlet valve 26 by converting digital signals into electrical signals, the first liquid level sensor 27 controls the closing of the de-icing pool water outlet valve 26 and the opening of the de-icing pool water inlet valve 28, and the second liquid level sensor 29 controls the closing of the de-icing pool water inlet valve 28. Preferably, the de-icing tank outlet valve 26 and the de-icing tank inlet valve 28 are both electric valves, and the working principle of the electric valve is to use electrical energy as power to connect the electric actuator to drive the valve to achieve the opening and closing and regulating actions of the valve.

[0067] By arranging a liquid level sensor and a temperature monitor in the deicing tank 30, when deicing the ice mold, the deicing water is automatically and timely changed to a stable deicing temperature through temperature detection and valve control, thereby improving the deicing efficiency of the ice mold. The deicing tank liquid level sensor controls the inlet and outlet of the deicing water to ensure safe operation.

[0068] In some embodiments of the present invention, a method for making ice using LNG cold energy brine is also provided, comprising the following steps:

[0069] Step S1: LNG coming out of the LNG storage tank 1 enters the first heat exchanger 3 to exchange heat with the refrigerant, is vaporized and heated, is further heated by the recuperator 4, is pressure-regulated by the pressure regulator 6, enters the meter 7 for adjustment, and then enters the natural gas pipeline network, wherein the first regulating valve 2 arranged between the LNG storage tank 1 and the first heat exchanger 3 regulates the flow rate and emergency cuts off the inflowing LNG; LNG is heated and vaporized by the first heat exchanger 3 to form natural gas, is further heated by the recuperator 4, and is flow-regulated by the second regulating valve 5 arranged between the recuperator 4 and the pressure regulator 6.

[0070] Step S2: the ice-making water from the water adder 18 enters the empty ice mold 12, and at the same time, the low-temperature refrigerant from the tube side of the first heat exchanger 3 enters the second heat exchanger 8 to exchange heat with the brine. The temperature of the low-temperature refrigerant increases and circulates into the tube side of the first heat exchanger 3. The brine cools down and enters the water separator 9. The low-temperature brine enters the ice-making pool 11 through the water separator 9 to cool the ice-making water in the ice mold 12. The temperature of the ice-making water decreases to form ice cubes. The temperature of the low-temperature brine increases and enters the brine buffer tank 14 through the water collector 13. The brine is stirred in the brine buffer tank 14 by the agitator 16 until the brine concentration is uniform, and then enters the shell side of the second heat exchanger 8 through the brine pump 19 to exchange heat with the refrigerant, and the cycle is repeated.

[0071] Step S3: After the ice cubes in the ice mold 12 are made, the ice quality detector 21 outputs a data signal converted into an electrical signal to start the ice mold lifter controller 22 through the wire. The ice mold lifter controller 22 sets the operation program of the ice mold lifter 23. The operation program instruction is converted into an electrical signal and connected to the ice mold lifter motor 23-1 through the wire to control the operation of the ice mold lifter 23. The ice mold lifter 23 is translated to the top of the ice-making device bracket 24 through the pulley 23-2 to the top of the ice mold 12 where ice making is completed, and then the ice mold hook traction rope 23-3 is released and extended so that the ice mold hook 23-4 hooks the ice mold 12, and then the ice mold hook traction rope 23-3 is retracted to lift the ice mold 12 to a specified height, and then it continues to translate to the top of the ice-removing pool 30 through the pulley 23-2, and the ice mold hook traction rope 23-3 is released to make the ice The mold 12 enters the ice-defusing pool 30 for ice-defusing operation. After the ice cubes inside the ice mold are removed, an empty ice mold is formed. The ice mold hook traction rope 23-3 is retracted to lift the empty ice mold to a specified height and then translate in the reverse direction to the upper left side of the water adder 18. The ice mold hook traction rope 23-3 is then released to place the empty ice mold on the ground on the left side of the water adder 18 for watering. After the empty ice mold is watered, the water-filled ice mold is lifted to a specified height and translated to above the vacant position of the ice-making pool 11 by retracting the ice mold hook traction rope 23-3. The ice mold hook traction rope 23-3 is released to allow the water-filled ice mold to enter the vacant position of the ice-making pool 11 for ice making, and the water-filled ice mold is separated from the ice mold hook 23-4. At this point, the ice mold hook traction rope 23-3 is retracted to lift the ice mold hook 23-4 to a specified height and then translate to the initial position, and the cycle is repeated.

[0072] Step S4: The ice mold 12 filled with ice cubes is defrosted in the deicing tank 30. When the temperature of the deicing water in the deicing tank 30 decreases, the data signal of the temperature detector 25 is converted into an electrical signal to start the deicing tank outlet valve 26. The low-temperature deiced water enters the water adder 18 through the deicing tank outlet valve 26 to add water to the empty ice mold. When the liquid level of the low-temperature deiced water in the deicing tank 30 decreases to the position of the first liquid level sensor 27, the deicing tank inlet valve 28 is started to add room-temperature deiced water into the deicing tank 30. When the liquid level of the room-temperature deiced water in the deicing tank 30 rises to the position of the second liquid level sensor 29, the deicing tank inlet valve 28 is closed, and the cycle is automatically repeated.

[0073] Example 1

[0074] Taking the LNG cold energy brine ice-making method and device with a daily output of 40 tons of ice as an example, each ice block weighs 100kg, saving 2880kWh of electricity and 0.87 tons of standard coal per day, reducing carbon dioxide emissions by 2.26 tons per day, and the overall volume of the device is 16750mm×4130mm×3400mm, with land area and equipment cost savings accounting for 52% and 47% respectively.

[0075] like Figure 1 As shown, an LNG cold energy brine ice making device comprises:

[0076] LNG storage tank 1, first regulating valve 2, first heat exchanger 3, recuperator 4, second regulating valve 5, pressure regulator 6, meter 7, second heat exchanger 8, water distributor 9, plastic chain conveyor 10, ice making pool 11, ice mold 12, water collector 13, brine buffer tank 14, stirring motor 15, stirrer 16, concentration detector 17, water adder 18, brine pump 19, infrared temperature detector 20, ice quality detector 21, ice mold lifter controller 22, ice mold lifter 23, temperature detector 25, de-icing pool outlet valve 26, first liquid level sensor 27, de-icing pool inlet valve 28, second liquid level sensor 29, de-icing pool 30. The input end of the first heat exchanger 3 is connected to the output end of the LNG storage tank 1; the input end of the reheater 4 is connected to the tube-side output end of the first heat exchanger 3; the input end of the brine buffer tank 14 is connected to the output end of the ice making and ice storage system; the input end of the brine pump 19 is connected to the output end of the brine buffer tank 14; the tube-side input end of the second heat exchanger 8 is connected to the shell-side output end of the first heat exchanger 3; the shell-side input end of the second heat exchanger 8 is connected to the output end of the brine buffer tank 14; the tube-side output end of the second heat exchanger 8 is connected to the shell-side input end of the first heat exchanger 3; the shell-side output end of the second heat exchanger 8 is connected to the input end of the ice making and ice storage system. The input end of the water adder 18 is connected to the output end of the de-icing pool 30; the input end of the water separator 9 is connected to the output end of the shell side of the second heat exchanger 8; the input end of the ice making pool 11 is connected to the output end of the water separator 9; the ice mold 12 is located inside the ice making pool 11; the input end of the water collector 13 is connected to the output end of the ice making pool 11. The infrared temperature detector is arranged outside the ice mold 12; the infrared temperature detector 20 is connected to the ice quality detector 21, and the ice mold lifter 23 is connected to the top end of the ice making device bracket 24.

[0077] The LNG cold energy brine ice making method of this embodiment is implemented using the above-mentioned LNG cold energy new brine ice making device, and specifically includes the following steps:

[0078] Step S1: LNG coming out of the LNG storage tank 1 enters the first heat exchanger 3 to exchange heat with the refrigerant, is vaporized and heated, is further heated by the recuperator 4, is pressure-regulated by the pressure regulator 6, and then enters the meter 7 for adjustment to enter the natural gas pipeline network, wherein the first regulating valve 2 arranged between the LNG storage tank 1 and the first heat exchanger 3 regulates the flow rate of the inflowing LNG and performs emergency cut-off; the LNG is heated and vaporized by the first heat exchanger 3 to form natural gas, is further heated by the recuperator 4, and then is flow-regulated by the second regulating valve 5 arranged between the recuperator 4 and the pressure regulator 6.

[0079] Step S2: the ice-making water from the water adder 18 enters the empty ice mold 12. At the same time, the low-temperature refrigerant from the tube side of the first heat exchanger 3 enters the second heat exchanger 8 to exchange heat with the brine. The temperature of the low-temperature refrigerant increases and circulates into the tube side of the first heat exchanger 3. The brine cools down and enters the water separator 9. The low-temperature brine enters the ice-making pool 11 through the water separator 9 to cool the ice-making water in the ice mold 12. The temperature of the ice-making water decreases to form ice cubes. The temperature of the low-temperature brine increases and enters the brine buffer tank 14 through the water collector 13. The brine is stirred in the brine buffer tank 14 by the agitator 16 until the brine concentration is uniform. Then it enters the shell side of the second heat exchanger 8 through the brine pump 19 to exchange heat with the refrigerant, and the cycle is repeated.

[0080] Step S3: After the ice cubes in the ice mold 12 are made, the data signal output by the ice cube quality detector 21 is converted into an electrical signal to start the ice mold lifter controller 22 through the wire. The ice mold lifter controller 22 sets the operation program of the ice mold lifter 23. The operation program instruction is converted into an electrical signal and connected to the ice mold lifter motor 23-1 through the wire to control the operation of the ice mold lifter 23. The ice mold lifter 23 is translated to the top of the ice-making device bracket 24 through the pulley 23-2 to the top of the ice mold 12 where ice making is completed. Then, the ice mold hook traction rope 23-3 is released and extended so that the ice mold hook 23-4 is connected to the ice mold 12. The ice mold hook traction rope 23-3 is retracted to lift the ice mold 12 to a specified height and then continue to translate to the top of the ice-removing pool 30. By releasing the ice mold hook traction rope 23-3, the ice mold 12 is The ice mold enters the de-icing pool 30 to perform de-icing operations. After the ice cubes inside the ice mold are removed, an empty ice mold is formed. The ice mold hook traction rope 23-3 is retracted to lift the empty ice mold to a specified height and then move it in the reverse direction to the upper left side of the water adder 18. The ice mold hook traction rope 23-3 is then released to place the empty ice mold on the ground on the left side of the water adder 18 for watering. After the empty ice mold is watered, the water-filled ice mold is lifted to a specified height by retracting the ice mold hook traction rope 23-3 and then moved to the upper side of the vacant position in the ice-making pool. The ice mold hook traction rope 23-3 is released to allow the water-filled ice mold to enter the vacant position in the ice-making pool for ice making, and the water-filled ice mold is separated from the ice mold hook 23-4. At this point, the ice mold hook traction rope 23-3 is retracted to lift the ice mold hook 23-4 to a specified height and then move it to the initial position, and the cycle continues.

[0081] Step S4: The ice mold 12 filled with ice cubes is defrosted in the deicing tank 30. When the temperature of the deicing water in the deicing tank 30 decreases, the data signal of the temperature detector 25 is converted into an electrical signal to start the deicing tank outlet valve 26. The low-temperature deiced water enters the water adder 18 through the deicing tank outlet valve 26 to add water to the empty ice mold. When the liquid level of the low-temperature deiced water in the deicing tank 30 decreases to the position of the first liquid level sensor 27, the deicing tank inlet valve 28 is started to add room-temperature deiced water into the deicing tank 30. When the liquid level of the room-temperature deiced water in the deicing tank 30 rises to the position of the second liquid level sensor 29, the deicing tank inlet valve 28 is closed, and the cycle is automatically repeated.

[0082] Example 2

[0083] The LNG cold energy brine ice making device provided in this embodiment includes four systems, including: LNG gasification system, cold energy recovery system, ice making and ice storage system, and ice removal system. The LNG gasification system includes an LNG storage tank 1, a first heat exchanger 2, and a recuperator 3; the cold energy recovery system includes a brine buffer tank 14, a brine pump 19, and a second heat exchanger 8; the ice making and ice storage system includes a water distributor 9, an ice making pool 11, an ice mold 12, a plastic chain conveyor 10, a water collector 13, and a water adder 18; the ice removal system includes an ice quality detector 21, an ice mold lifter controller 22, an ice mold lifter 23, and an ice removal pool 30; the brine buffer tank 14 is provided with an agitator 16 and a concentration detector 17; the stirring motor 15 is connected to the agitator 16 and the concentration detector 17.

[0084] The brine concentration setting value is 0.24. When solid precipitation is generated in the brine buffer tank 14 and the brine concentration detected by the concentration detector 17 is lower than the set value, the data signal of the concentration detector 17 is converted into an electrical signal to control the start of the stirring motor. The agitator 16 then stirs the brine until the brine concentration reaches the set value and stabilizes for 4 minutes, thereby ensuring that the brine concentration is uniform and stable and the brine cooling performance is guaranteed.

[0085] Example 3

[0086] The LNG cold energy brine ice making device provided in this embodiment includes four systems, including: LNG gasification system, cold energy recovery system, ice making and ice storage system, and ice stripping system. The LNG gasification system includes an LNG storage tank 1, a first heat exchanger 2, and a recuperator 3; the cold energy recovery system includes a brine buffer tank 14, a brine pump 19, and a second heat exchanger 8; the ice making and ice storage system includes a water distributor 9, an ice making pool 11, an ice mold 12, a plastic chain conveyor 10, a water collector 13, and a water adder 18; the ice stripping system includes an ice quality detector 21, an ice mold lifter controller 22, an ice mold lifter 23, an ice making device bracket 24, and an ice stripping pool 30. The ice mold lifter 23 includes an ice mold lifter motor 23-1, a pulley 23-2, an ice mold hook traction rope 23-3, and an ice mold hook 23-4. The pulley 23-2 is located at the top of the ice making device bracket 24, and the ice mold hook traction rope 23-3 is connected to the ice mold hook 23-4.

[0087] The ice molds 12 in the ice making and ice storage system are arranged in multiple rows and columns, and an infrared temperature detector 20 is arranged on the outside of each row of ice molds (only the infrared temperature detector 20 corresponding to one row of ice molds is shown in the figure), and each ice mold has three temperature measurement points, which are the middle vertical upper end, the middle part, and the lower end of each ice mold. When measuring the temperature, the infrared energy emitted by the infrared temperature detector 20 corresponding to the outer side of each row of ice molds 20 can penetrate from the first ice mold to the last ice mold in sequence. Specifically, the infrared temperature detector 20 can emit three beams of infrared energy to the middle vertical upper end, the middle part, and the lower end of each row of ice molds, respectively, so that the temperature signal (electrical signal) of each temperature measurement point can be obtained accordingly.

[0088] The ice quality detector 21 includes an ice mold internal temperature detection module 21-1 and an ice making timing module 21-2. The two modules are connected by a circuit and jointly controlled to determine the completion status of ice making in the ice making pool 11. An infrared temperature detector 20 is set in the middle of the outer side of the ice mold 12, and an infrared temperature detector 20 is correspondingly set for each row of ice molds. The infrared temperature detector 20 is connected to the ice mold internal temperature detection module 21-1 of the ice quality detector 21 through a circuit. The infrared temperature detector 20 detects the set ice mold position through program setting, and the infrared temperature detector 20 detects the three positions of the middle vertical upper end, the middle, and the lower end of the ice mold 12. When the infrared temperature detector 20 measures the temperature, it measures the temperature of the middle vertical upper end, the middle, and the lower end of the ice mold 12. Infrared energy is emitted from the middle and lower positions, which is converted into an electrical signal through the optical system of the infrared temperature detector 20, and then transmitted to the ice mold internal temperature detection module 21-1 of the ice quality detector 21 through the wire, so that the internal temperature readings of each ice mold 12 in the ice making pool 11 are displayed, and the temperature difference data of each temperature measuring point inside each ice mold 12 are displayed at the same time, and it is judged whether the temperature difference of the temperature measuring points inside each ice mold in each row of ice molds reaches the set standard. In addition, when the ice mold filled with water is placed in the ice making pool 11 and ice making starts, the ice making timing module 21-2 is started. When the ice making timing module 21-2 of the ice quality detector 21 displays the preset time (such as 16h), the set standard is reached, and the temperature difference inside each ice mold 12 in a row of ice molds is ≤0.When the temperature reaches 1°C, the ice quality detector 21 determines that the ice cubes in a row of ice molds are completed, and the ice quality detector 21 converts the data signal into an electrical signal to start the ice mold lifter controller 22 through the wire. The ice mold lifter controller 22 sets the operation program of the ice mold lifter 23. The operation program instruction is converted into an electrical signal and connected to the ice mold lifter motor 23-1 through the wire to control the operation of the ice mold lifter 23. The ice mold lifter 23 is translated to the top of the ice making device bracket 24 through the pulley 23-2 to the top of the ice mold 12 where ice making is completed, and then the ice mold hook traction rope 23-3 is released to extend the ice mold hook 23-4 to connect the ice mold 12, and then the ice mold hook traction rope 23-3 is retracted to lift the ice mold 12 to a specified height, and then continues to translate to the top of the ice-removing pool 30, and the ice mold hook traction rope 23-3 is released to make the ice mold 12 The ice mold 12 enters the ice-de-icing pool 30 for de-icing operation. After the ice cubes inside the ice mold 12 are removed, an empty ice mold is formed. The ice mold hook traction rope 23-3 is retracted to lift the empty ice mold to a specified height and then translate in the reverse direction to the upper left side of the water adder 18. The ice mold hook traction rope 23-3 is released to place the empty ice mold on the ground on the left side of the water adder 18 and add water through the water adder 18. After the empty ice mold is filled with water, the ice mold filled with water is lifted to a specified height by retracting the ice mold hook traction rope 23-3 and then translated to the upper vacant position of the ice-making pool 11. The ice mold hook traction rope 23-3 is released to allow the ice mold filled with water to enter the vacant position of the ice-making pool 11 for ice making, and the ice mold filled with water is separated from the ice mold hook 23-4. At this point, the ice mold hook traction rope 23-3 is retracted to lift the ice mold hook 23-4 to a specified height and then translate to the initial position, and the cycle is repeated. This embodiment can realize the automatic transfer of the ice mold 12 after ice making and the empty ice mold, thereby improving the automation level of the device.

[0089] Example 4

[0090] The LNG cold energy brine ice making device provided in this embodiment includes four systems, including: LNG gasification system, cold energy recovery system, ice making and ice storage system, and de-icing system. The LNG gasification system includes an LNG storage tank 1, a first heat exchanger 2, and a recuperator 3; the cold energy recovery system includes a brine buffer tank 14, a brine pump 19, and a second heat exchanger 8; the ice making and ice storage system includes a water distributor 9, an ice making pool 11, an ice mold 12, a plastic chain conveyor 10, a water collector 13, and a water adder 18; the de-icing system includes an ice quality detector 21, an ice mold lifter controller 22, an ice mold lifter 23, and a de-icing pool 30; the de-icing pool is provided with a first liquid level sensor 27, a second liquid level sensor 29, a temperature detector 25, a de-icing pool water inlet valve 28, and a de-icing pool water outlet valve 26.

[0091] When the temperature detector 25 shows that the temperature of the deicing water in the deicing pool 30 is lower than a preset value (e.g., 10°C), since the temperature of the deicing water is too low and the temperature difference with the ice in the ice mold 12 is small, the deicing water cannot exchange heat with the ice in the ice mold 12 to achieve the deicing operation, and the required deicing time is extended (e.g., extended to 1 hour), then the deicing water in the deicing pool 30 needs to be replaced, that is, the deicing pool water outlet valve 26 is opened, and the low-temperature deicing water flows out into the water adder 18 to add water to the empty ice mold. When the amount of water added reaches 3 / 4 of the volume of the ice mold 12, the water addition is stopped, and the water is transferred to the ice making pool 11 by the ice mold lifter 23 to make ice. During the de-icing process, the ice-making time is shortened (e.g., shortened by 2 hours) due to the low initial temperature of the ice-making water. The water is added in a cycle until the low-temperature de-icing water level in the de-icing pool 30 drops to the position of the first liquid level sensor 27 at the lower end of the outer side of the de-icing pool 30. Then, the electric signal controls the de-icing pool outlet valve 26 to close. At the same time, the de-icing pool inlet valve 28 is opened to add 30°C normal-temperature de-icing water into the de-icing pool 30 until the normal-temperature de-icing water level in the de-icing pool 30 rises to the second liquid level sensor 29 at the upper end of the outer side of the de-icing pool 30. Then, the de-icing pool inlet valve 28 is closed. When de-icing is performed under this condition, the de-icing time is shortened to 15 minutes. Therefore, through the joint control of the temperature detector 25 and the valve, the automatic discharge of the low-temperature de-icing water and the automatic replenishment of the normal-temperature de-icing water in the de-icing pool 30 are realized, and the ice-making efficiency is improved to ensure the de-icing rate.

[0092] In the above-mentioned embodiment of the present invention, the concentration of the brine is promptly and effectively controlled to be uniform and stable through the stirring of the stirrer 16 to avoid the generation of solid precipitation, and a concentration detector 17 is provided to monitor the concentration of the brine at any time to ensure the cooling performance of the brine.

[0093] The aforementioned embodiment of the present invention, by setting up an ice quality detector, monitors the ice making situation at any time, and connects the ice mold lifter for joint control. When the ice making is completed, the ice mold lifter transfers the ice mold that has completed ice making to the ice defrosting pool for defrosting. Subsequently, another ice mold lifter transfers the empty ice mold to the ice making pool for adding water to make ice. In this way, the degree of automation of the device is improved, manpower consumption is reduced, and continuous production is achieved.

[0094] In the above-mentioned embodiment of the present invention, a plastic chain conveyor is arranged at the bottom of the ice mold. When ice making is completed and the ice mold that has completed ice making has been transferred to the ice-removing pool through the ice mold lifter, the plastic chain conveyor is started to move the unfinished ice mold from the high-temperature end of the ice-making pool to the low-temperature end, so that the ice mold and the brine form countercurrent heat exchange, thereby improving the heat exchange efficiency and shortening the ice making time.

[0095] In the above-mentioned embodiment of the present invention, a liquid level sensor and a temperature monitor are arranged in the defrosting tank. When defrosting the ice mold, the defrosting water is automatically and timely changed to a stable defrosting temperature through temperature detection and valve control, thereby improving the defrosting efficiency of the ice mold. The liquid level sensor in the defrosting tank controls the inlet and outlet of the defrosting water to ensure safe operation.

[0096] The technical solutions provided by the embodiments of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, according to the embodiments of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An LNG cold energy brine ice making device, characterized in that: Including LNG gasification system, cold energy recovery system, ice making and storage system and de-icing system; The LNG gasification system is used for gasification of LNG to release the cold energy contained in LNG; the LNG gasification system comprises an LNG storage tank and a first heat exchanger; the input end of the first heat exchanger is connected to the output end of the LNG storage tank; The cold energy recovery system is used to recover the cold energy generated by LNG gasification and supply cold to the ice-making and ice-storage system; the cold energy recovery system includes a brine buffer tank and a second heat exchanger, the input end of the brine buffer tank is connected to the output end of the ice-making and ice-storage system; the tube-side input end of the second heat exchanger is connected to the shell-side output end of the first heat exchanger; the shell-side input end of the second heat exchanger is connected to the output end of the brine buffer tank; the tube-side output end of the second heat exchanger is connected to the shell-side input end of the first heat exchanger; the shell-side output end of the second heat exchanger is connected to the input end of the ice-making and ice-storage system; The ice making and ice storage system is used to complete ice making and ice storage; the ice making and ice storage system includes a water separator, an ice making pool, an ice mold, a water collector, and a water adder; the input end of the water separator is connected to the shell side output end of the second heat exchanger; the ice making pool is used for making and storing ice cubes, and the input end of the ice making pool is connected to the output end of the water separator; the ice mold is located inside the ice making pool; the input end of the water collector is connected to the output end of the ice making pool, and the water adder is used to add water to the ice mold; The de-icing system is used for de-icing after the ice is made; the de-icing system includes an infrared temperature detector, an ice quality detector, an ice mold lifter controller, an ice mold lifter and an de-icing pool; the infrared temperature detector is used to monitor the temperature of the ice mold; the infrared temperature detector is connected to the ice quality detector; the ice mold lifter is located above the ice mold and can be translated and raised and lowered at the positions of the ice making and ice storage system and the de-icing system, and the ice mold lifter can be connected to the ice mold; the ice quality detector is used to determine whether the temperature difference of the ice in the ice mold meets the set standard and to perform ice making timing; the ice mold lifter controller is connected to the ice quality detector and the ice mold lifter; the de-icing pool is used to de-ice the water mold, and the output end of the de-icing pool is connected to the input end of the water adder.

2. The LNG cold energy brine ice making device according to claim 1 is characterized in that: The LNG gasification system further includes a recuperator, a pressure regulator and a meter; the recuperator, the pressure regulator and the meter are connected in sequence, and the input end of the recuperator is connected to the tube side output end of the first heat exchanger.

3. The LNG cold energy brine ice making device according to claim 2 is characterized in that: A first regulating valve is provided between the LNG storage tank and the first heat exchanger; and a second regulating valve is provided between the reheater and the pressure regulator.

4. The LNG cold energy brine ice making device according to claim 1, characterized in that: A concentration detector and a rotatable agitator are arranged inside the brine buffer tank, and the concentration detector is used to monitor the brine concentration in the brine buffer tank.

5. The LNG cold energy brine ice making device according to claim 1, characterized in that: The ice molds in the ice making pool have multiple rows and columns, and the water distributor is used to supply low-temperature brine to the ice making pool to ensure that the temperature of the low-temperature brine entering the ice making pool is consistent.

6. The LNG cold energy brine ice making device according to claim 1, characterized in that: The ice-making pool is formed by splicing PP plates and covered by steel plates. According to the LNG cold energy brine ice making device of claim 1, it is characterized in that the ice making and ice storage system also includes a conveyor, which is located at the bottom of the ice mold and is used to realize the movement of the ice mold in the ice making pool.

7. The LNG cold energy brine ice making device according to claim 1, characterized in that: The ice making and ice storage system also includes an ice making device bracket, and the ice mold lifter includes an ice mold lifter motor, an ice mold hook traction rope and a connecting piece. The ice mold lifter motor is slidably arranged on the top of the ice making device bracket and is located above the ice making and ice storage system and the ice removing system. The ice mold hook traction rope and the output end of the ice mold lifter motor are used to release and extend or retract and shorten the ice mold hook traction rope. The connecting piece is connected to the ice mold hook traction rope, and the connecting piece is used to be connected to the ice mold.

8. The LNG cold energy brine ice making device according to claim 7, characterized in that: The ice mold lifter also includes a pulley and a motor fixing rod. Pulleys are slidably arranged at both ends of the top of the ice making device bracket. Both ends of the motor fixing rod are respectively connected to the pulleys at both ends of the ice making device bracket. The ice mold lifter motor is fixed on the motor fixing rod.

9. The LNG cold energy brine ice making device according to any one of claims 1-8, characterized in that: The de-icing pool is provided with a first liquid level sensor, a second liquid level sensor, a temperature detector, a de-icing pool water inlet valve, and a de-icing pool water outlet valve; the temperature detector is used to monitor the temperature of the liquid in the de-icing pool; the first liquid level sensor and the second liquid level sensor are respectively located at different heights of the de-icing pool, and are used to monitor the liquid level heights at different positions; the de-icing pool water inlet valve and the de-icing pool water outlet valve are respectively used to control the water inlet and water outlet of the de-icing pool.

10. A method for making ice using LNG cold energy brine, characterized in that: The device according to any one of claims 1 to 9 comprises the following steps: LNG from the LNG storage tank enters the first heat exchanger to exchange heat with the refrigerant; Ice-making water is added to the empty ice mold through the water adder. At the same time, the low-temperature refrigerant from the tube side of the first heat exchanger enters the second heat exchanger to exchange heat with the brine. After the temperature of the low-temperature refrigerant increases, it circulates into the tube side of the first heat exchanger. The brine cools down and enters the water distributor. The low-temperature brine enters the ice-making pool through the water distributor to cool the ice-making water in the ice mold. The temperature of the ice-making water decreases to form ice cubes. The temperature of the low-temperature brine increases and enters the brine buffer tank through the water collector. The brine with uniform concentration in the brine buffer tank enters the shell side of the second heat exchanger to exchange heat with the refrigerant, and the cycle is repeated. After the ice cubes in the ice mold are made, the ice mold lifter is started by the ice mold lifter controller, the ice mold lifter moves to the top of the ice mold that has completed ice making, then moves the ice mold that has completed ice making to the top of the ice defrosting pool, and puts the ice mold that has completed ice making into the ice defrosting pool for defrosting operation; after the ice cubes inside the ice mold are removed, an empty ice mold is formed, the empty ice mold is lifted by the ice mold lifter and moved to the water adder, and the water adder adds water to the empty ice mold; after the empty ice mold is filled with water, it is moved to the vacant position of the ice making pool by the ice mold lifter to make ice, and the ice mold lifter returns to the initial position, and the cycle is repeated.

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