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

Abstract

The utility model discloses an LNG (Liquefied Natural Gas) cold energy saline water ice making device which 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. According to the utility model, brine ice making is carried out through LNG cold energy, so that energy conservation and consumption reduction are realized, and the ice block quality is improved; the ice maker has the advantages of high automation degree, long service life, small occupied area, low investment cost, high cold energy utilization rate, high ice making efficiency and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of brine ice making, especially to a LNG cold energy brine ice making device. BACKGROUND

[0002] In the ice making industry, the traditional and common ice making method is to use brine to make ice. The brine ice making method is to put a galvanized steel plate material ice making bucket into a brine pool, use a refrigeration system to reduce the temperature of the brine to below zero, and then the low-temperature brine exchanges heat with the water in the ice making bucket through the ice making bucket wall to make the water in the ice making bucket gradually freeze into ice. Then the ice making bucket is lifted by a lifting device and placed in a normal temperature water pool to separate the ice block from the ice making bucket wall. Finally, the ice block is poured out for storage.

[0003] The ice block made by the traditional brine ice making method is solid and not easy to melt, which is convenient for storage and transportation. However, this ice making method uses a compressor for refrigeration, and the overall energy consumption of the system is high. The ice making speed is relatively slow, and a long ice making time is needed. It belongs to an open type system of the coolant, and the brine directly contacts with the air, which can easily dilute the brine and cause a large heat loss. The brine has strong corrosive properties, which can corrode the ice bucket and the brine pool. After ice making is completed, the ice separation time is long, and the ice discharge and storage need manual operation, which is complex and slow. A storage library needs to be added for ice storage, which occupies a large area and has high investment cost.

[0004] The utility model patent CN 210718247 U discloses a brine ice making energy efficiency improvement cold water machine. The scheme can make ice blocks that meet the standards by setting a refrigeration compressor to provide cooling for the ice making pool after refrigeration. However, this cooling method needs to use municipal electricity for operation, which has high energy consumption and low economic benefit.

[0005] The utility model patent CN 108151386 A discloses a brine ice making refrigeration system and operation method. The scheme lifts the ice making bucket through the bracket after the ice making water forms solid ice. This process needs manual operation, lacks automatic control for ice block transfer by automatic detection of ice block quality, and has low overall automation degree. The scheme sets a ice separation pool for ice separation and injects ice separation water through the inlet and outlet of the condenser, which effectively utilizes the excess energy. However, the ice separation pool does not set a temperature detector and a liquid level sensor. When the temperature of the ice separation water in the ice separation pool decreases after multiple ice separation operations, the ice separation time is too long. In addition, the lack of liquid level sensor cannot determine the liquid level when the ice separation pool is filled with water, which can cause ice separation water to overflow during the ice separation process when the liquid level is too high, and the ice separation time is too long when the liquid level is too low. UTILITY MODEL CONTENTS

[0006] In order to at least solve one of the problems existing in the prior art, the utility model provides a kind of LNG cold energy salt water ice making device, and ice is made by LNG cold energy, energy saving is realized, and ice quality is improved.

[0007] The utility model provides a kind of LNG cold energy salt water ice making method and device, comprising:

[0008] The LNG gasification system is used for the gasification of LNG, and releases the cold energy contained in LNG;The LNG gasification system includes LNG storage tank, first heat exchanger;The input end of the first heat exchanger is communicated with the output end of LNG storage tank;

[0009] The cold energy recovery system is used for recovering the cold energy generated by LNG gasification, and supplies cold to the ice making and storing system;The cold energy recovery system includes salt water buffer tank and second heat exchanger, the input end of the salt water buffer tank is communicated with the output end of the ice making and storing system;The tube side input end of the second heat exchanger is communicated with the shell side output end of the first heat exchanger;The shell side input end of the second heat exchanger is communicated with the output end of the salt water buffer tank;The tube side output end of the second heat exchanger is communicated with the shell side input end of the first heat exchanger;The shell side output end of the second heat exchanger is communicated with the input end of the ice making and storing system;

[0010] The ice making and storing system is used for completing ice block production and storing;The ice making and storing system includes water distributor, ice making pool, ice mold, water collector and water feeder;The input end of the water distributor is communicated with the shell side output end of the second heat exchanger;The ice making pool is used for ice block production and storage, and the input end of the ice making pool is communicated with the output end of the water distributor;The ice mold is located inside the ice making pool;The input end of the water collector is communicated with the output end of the ice making pool, and the water feeder is used for adding water to the ice mold;

[0011] The ice removing system is used for ice block production after ice removal;The ice removing system includes infrared temperature detector, ice block quality detector, ice mold lifter controller, ice mold lifter and ice removing pool;The infrared temperature detector is used for monitoring the temperature of the ice mold;The infrared temperature detector is connected with the ice block quality detector;The ice mold lifter is located above the ice mold and can translate and lift on the location of the ice making and storing system and the ice removing system, and the ice mold lifter can be connected with the ice mold;The ice block quality detector is used for monitoring the ice block in the ice mold;The ice mold lifter controller is connected with the ice block quality detector and the ice mold lifter;The ice removing pool is used for ice mold ice removal, and the output end of the ice removing pool is communicated with the input end of the water feeder.

[0012] Further, as an improvement of the technical scheme of the utility model, the LNG gasification system further comprises a reheater, a pressure regulator and a meter; the reheater, the pressure regulator and the meter are connected in sequence, and an input end of the reheater is communicated with a tube side output end of the first heat exchanger.

[0013] Further, as an improvement of the technical scheme of the utility model, a first regulating valve is arranged between the LNG storage tank and the first heat exchanger to regulate LNG flow; a second regulating valve is arranged between the reheater and the pressure regulator to regulate natural gas flow.

[0014] Further, as an improvement of the technical scheme of the utility model, a heat exchange medium of the first heat exchanger is propane, propane is subjected to heat exchange with LNG, and propane at a reduced temperature enters the second heat exchanger to be subjected to heat exchange.

[0015] Further, as an improvement of the technical scheme of the utility model, a heat exchange medium of the second heat exchanger is brine, brine is subjected to heat exchange with propane, and brine at a reduced temperature enters the ice making and storing system to supply cold energy.

[0016] Further, as an improvement of the technical scheme of the utility model, the brine buffer tank is used to stabilize the brine level of the ice making pool; the brine buffer tank is internally provided with a concentration detector and a rotatable stirrer; a stirring motor is connected with the stirrer and the concentration detector, and the concentration detector is used to monitor the brine concentration in the brine buffer tank.

[0017] When cold energy is recycled, the brine buffer tank with the stirrer can timely and effectively control the uniform and stable brine concentration, and maintain the brine concentration to ensure the brine cooling performance.

[0018] Further, as an improvement of the technical scheme of the utility model, the ice molds in the ice making pool are in multiple rows and multiple columns; the water distributor is used to supply low-temperature brine to the ice making pool to ensure that the low-temperature brine has a consistent temperature entering the ice making pool, so that the ice block making time of the ice molds in the same column is the same, and the effect of continuous batch ice making is achieved.

[0019] Further, as an improvement of the technical scheme of the utility model, the ice making pool is used for ice block making and storing; the ice making and storing integration is realized, and the occupied area is small; the ice making pool is spliced by PP plates and covered by steel plates and supported by I-shaped steel, so that heat insulation is realized to reduce cold energy loss, brine corrosion is avoided, the service life of the ice making pool is prolonged, and the cost of the ice making pool is reduced.

[0020] Further, as an improvement of the technical scheme of the utility model, the ice making and storing system further comprises a conveyor, and the conveyor is located at the bottom of the ice mold to realize the displacement of the ice mold in the ice making pool.

[0021] The ice mold that has not completed ice making can be transferred to the low-temperature end through the conveying machine to exchange heat with brine in countercurrent, improve the heat exchange efficiency, and shorten the ice making time.

[0022] Further, the ice making and storing system further comprises an ice making device support, the ice mold lifter comprises an ice mold lifter motor, an ice mold hook traction rope and a connecting piece, the ice mold lifter motor is slidingly arranged on the top of the ice making device support and located above the ice making and storing system and the ice removing system, the ice mold hook traction rope is connected with the output end of the ice mold lifter motor to release the elongation or recovery of the ice mold hook traction rope, and the connecting piece is connected with the ice mold hook traction rope.

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

[0024] Further, the ice mold lifter further comprises a pulley and a motor fixing rod, the pulleys are slidingly arranged at both ends of the top of the ice making device support, the motor fixing rod is connected with the pulleys at both ends of the ice making device support, and the ice mold lifter motor is fixed on the motor fixing rod.

[0025] Further, the ice removing tank is provided with a first liquid level sensor, a second liquid level sensor, a temperature detector, an ice removing tank water inlet valve and an ice removing tank water outlet valve, the temperature detector is used for monitoring the temperature of the liquid in the ice removing tank, the first liquid level sensor and the second liquid level sensor are located at different height positions of the ice removing tank and are used for monitoring the liquid level at different positions.

[0026] The ice removing water can be automatically replaced in time to stabilize the ice removing temperature, the ice removing efficiency of the ice mold is improved, the ice removing tank liquid level sensor controls the ice removing water inlet and outlet, and the operation safety is ensured.

[0027] Preferably, the temperature detector is located at a middle end position in the ice removing tank, the first liquid level sensor and the second liquid level sensor are located at upper and lower end positions of the side of the ice removing tank, the ice removing tank water inlet valve is located at a middle position of the outside of the ice removing tank, and the ice removing tank water outlet valve is located at a lower end position of the outside of the ice removing tank.

[0028] Compared with the prior art, the ice making and storing system has the following beneficial effects:

[0029] The utility model discloses can realize the integration of ice making and ice storage, can reduce the floor area, reduce production cost, ice block quality detection and mobile ice removal combined control in the utility model, reduce the operation difficulty of ice block transfer ice removal, can promote the degree of automation of device, reduce the human consumption, the utility model discloses can effectively solve the low degree of automation, short service life, ice making ice removal long time, low heat exchange efficiency, large floor area etc. Problem in the operation process, the device that the utility model discloses uses is the infrastructure that the market produces basically, and the price is cheap, and production and processing are simple, convenient maintenance and replacement. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 The utility model discloses a kind of structure schematic view of LNG cold energy brine ice making device for embodiment of the utility model;

[0031] Figure 2 It is the concentration control schematic view of brine buffer tank for embodiment of the utility model;

[0032] Figure 3 It is the ice removal system schematic view for embodiment of the utility model;

[0033] Figure 4 It is the ice block quality detection schematic view for embodiment of the utility model;

[0034] Figure 5 It is the ice removal pool ice water replacement control schematic view for embodiment of the utility model;

[0035] Figure 6 It is the ice making and ice storage system schematic view for embodiment of the utility model.

[0036] In the drawing: 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-conveyer, 11-ice making pool, 12-ice mould, 13-water collector, 14-brine buffer tank, 15-stirring motor, 16-stirrer, 17-concentration detector, 18-water feeder, 19-brine pump, 20-infrared temperature detector, 21-ice block quality detector, 22-ice mould lifter controller, 23-ice mould lifter, 24-ice making device support, 25-temperature detector, 26-ice removal pool water outlet valve, 27-first liquid level sensor, 28-ice removal pool water inlet valve, 29-second liquid level sensor, 30-ice removal pool. DETAILED DESCRIPTION

[0037] The utility model will be combined with drawing and specific embodiment to be explained in detail, here with the illustrative embodiment of the utility model and explanation are used to explain the utility model, but not as the limitation to the utility model.

[0038] It should be noted that all directionality indications (such as up, down, left, right, front, back, upper end, lower end, top, bottom, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directionality indications will also change accordingly.

[0039] In the present application, unless otherwise explicitly specified and limited, the term "connection" should be understood broadly, for example, "connection" can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise explicitly limited. For ordinary skilled in the art, the specific meaning of the above-mentioned term in the present application can be understood according to the specific circumstances.

[0040] In addition, in the present application, the description such as "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features; in addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor in the protection scope required by the present application.

[0041] As shown in Figures 1 to 6 The present application provides a kind of LNG cold energy salt water ice making device, including:

[0042] LNG gasification system, the LNG gasification system is used for the gasification of LNG, releases the large amount of cold energy contained in LNG;The LNG gasification system includes LNG storage tank 1, first heat exchanger 3 and reheater 4, the input end of first heat exchanger 3 is communicated with the output end of LNG storage tank 1;The input end of the reheater 4 is communicated with the tube side output end of the first heat exchanger 3;

[0043] The cold energy recovery system is used for recovering cold energy generated by LNG gasification and supplying cold to the ice making and storing system; the cold energy recovery system comprises a brine buffer tank 14, a brine pump 19 and a second heat exchanger 8; the brine buffer tank 14 is used for stabilizing the brine level of the ice making pool 11 in the ice making and storing system, the input end of the brine buffer tank 14 is communicated with the output end of the ice making and storing system; the input end of the brine pump 19 is communicated with the output end of the brine buffer tank 14; the tube side input end of the second heat exchanger 8 is communicated with the shell side output end of the first heat exchanger 3, the shell side input end of the second heat exchanger 8 is communicated with the output end of the brine pump 19; the tube side output end of the second heat exchanger 8 is communicated with the shell side input end of the first heat exchanger 3; the shell side output end of the second heat exchanger 8 is communicated with the input end of the water distributor 9 of the ice making and storing system;

[0044] The ice making and storing system is used for completing ice block making and storing at the same time; the ice making and storing system comprises a water distributor 9, an ice making pool 11, an ice mold 12, a conveyor 10, a water collector 13 and a water feeder 18; the input end of the water feeder 18 is communicated with the output end of the ice removing pool 30 of the ice removing system; the input end of the water distributor 9 is communicated with the output end of the shell side of the second heat exchanger 8; the input end of the ice making pool 11 is communicated with the output end of the water distributor 9; the ice mold 12 is located inside the ice making pool 11, the conveyor 10 is located at the bottom of the ice mold 12 and is used for pushing the ice mold 12 in the ice making pool 11; the input end of the water collector 13 is communicated with the output end of the ice making pool 11. The water distributor 9 is mainly used for evenly distributing water to the ice making pool 11 and ensuring that the low-temperature brine entering the ice making pool 11 has the same temperature, such as-20℃, so as to realize batch ice block making. The ice making pool 11 is used for ice block making and storing; the ice making and storing system realizes integration of ice making and storing and occupies less area;

[0045] The ice removing system is used for ice block removing after ice block making; the ice removing system comprises an infrared temperature detector 20, an ice block quality detector 21, an ice mold lifter controller 22, an ice mold lifter 23, an ice making device support 24 and an ice removing pool 30; the infrared temperature detector 20 is arranged outside the ice mold 12; the infrared temperature detector 20 is connected with the ice block quality detector 21, the ice mold lifter 23 is connected with the top end of the ice making device support 24, and the vertical inner side of the ice making device support 24 is connected with the horizontal outer side of the ice making pool 11; the ice block quality detector 21 is used for detecting the ice block in the ice mold 12; the ice mold lifter controller 22 is connected with the ice block quality detector 21 and the ice mold lifter 23 through a line.

[0046] The ice block quality detector 21 comprises an ice mold internal temperature detection module 21-1 and an ice making timing module 21-2.

[0047] The ice block quality detector 21 is arranged to monitor the ice block production at any time, and is connected with the ice mold lifter 23 to jointly control the ice block production.

[0048] When the ice block production is completed and the ice mold lifter 23 is used to transfer the ice mold for ice block production to the ice removal pool 30, the conveyor 10 is started to move the ice mold for ice block production from the high-temperature end of the ice making pool to the low-temperature end, so that the ice mold can exchange heat with the brine in counter flow, improve the heat exchange efficiency, and shorten the ice making time.

[0049] Specifically, in some embodiments of the utility model, the conveyor 10 is a plastic chain plate conveyor.

[0050] Specifically, in some embodiments of the utility model, a pressure regulator 6 and a meter 7 are further included; the pressure regulator 6 is connected with the reheater 4 and the meter 7.

[0051] Specifically, in some embodiments of the utility model, a first regulating valve 2 is arranged between the LNG storage tank 1 and the first heat exchanger 3 to regulate the LNG flow; and a second regulating valve 5 is arranged between the reheater 4 and the pressure regulator 6 to regulate the natural gas flow.

[0052] Specifically, in some embodiments of the utility model, the heat exchange medium of the first heat exchanger 3 is propane, but is not limited to propane.

[0053] Specifically, in some embodiments of the utility model, the heat exchange medium of the second heat exchanger 8 is brine, and the brine exchanges heat with propane, and after the temperature of the brine is reduced, the brine enters the ice making and storing system to supply cold energy. Further, the temperature of the brine entering the second heat exchanger 8 is 15 DEG C, and after the brine exchanges heat in the second heat exchanger 8, the temperature of the brine flowing out is reduced to -23 DEG C, and then after the brine enters the ice making and storing system to supply cold energy, the temperature of the brine is increased to -10 DEG C.

[0054] Specifically, in some embodiments of the utility model, the stirring motor 15, the stirrer 16 and the concentration detector 17 are further included, the stirrer 16 and the concentration detector 17 are arranged inside the brine buffer tank 14, and the stirring motor 15 is connected with the stirrer 16 and the concentration detector 17. The stirring motor 15 controls the operation of the stirrer 16, avoids solid precipitation in the brine buffer tank 14 by stirring the brine, and ensures uniform and stable brine concentration. The concentration detector 17 is used for monitoring the brine concentration in the brine buffer tank 14, so as to accurately adjust the brine concentration.

[0055] By arranging the brine buffer tank 14 with the stirrer, when the cold energy is recycled, the stirring of the stirrer can effectively control the uniform and stable brine concentration in time, avoid solid precipitation, and the concentration detector 17 can monitor the brine concentration at any time, and the brine cooling capacity is ensured.

[0056] Specifically, in some embodiments of the utility model, the water distributor 9 is used for supplying low-temperature brine to the ice making pool 11, ensuring that the temperature of the low-temperature brine entering the ice making pool 11 is consistent, realizing that the ice block making time of the same column ice mold 12 is the same, and achieving the effect of continuous batch ice making.

[0057] Specifically, in some embodiments of the utility model, the ice making pool 11 is spliced by PP plates and covered by steel plates and supported by I-shaped steel, so as to realize heat insulation, reduce cold energy loss, avoid brine corrosion, prolong the service life of the ice making pool, and reduce the cost of the ice making pool. Further, the thickness of the PP plate is 5mm, which ensures the structural strength of the ice making 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 the PP plates and covering the steel plates and supporting the I-shaped steel, a stable structure can be formed, so as to realize heat insulation, reduce cold energy loss, avoid brine corrosion, prolong the service life, adopt the ice making and storing integrated form, occupy less area, and reduce the cost.

[0058] Specifically, in some embodiments of the utility model, when the temperature difference between the ice block and the low-temperature brine gradually decreases due to the gradual formation of the ice block in the ice mold 12, 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 exchanges heat with the low-temperature brine in counter flow, improving the heat exchange efficiency. Preferably, the moving speed of the plastic chain plate is 0.3 m / s, ensuring that the ice mold 12 moves at a constant speed.

[0059] Specifically, in some embodiments of the utility model, the ice mold lifter controller 22 controls the operation of the ice mold lifter 23, which 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 a motor fixing rod, and the two ends of the motor fixing rod are connected with the pulley 23-2 respectively. The pulley 23-2 slides on the top end of the ice-making device support 24. The ice mold hook traction rope 23-3 is connected with the ice mold hook 23-4, and the ice mold hook traction rope 23-3 is connected with the output end of the ice mold lifter motor 23-1, so that the ice mold hook traction rope 23-3 is extended or retracted by the ice mold lifter motor 23-1.

[0060] Specifically, in some embodiments of the utility model, the ice mold lifter controller 22 controls the operation of the ice mold lifter 23, which 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 a motor fixing rod, and the two ends of the motor fixing rod are connected with the pulley 23-2 respectively. The pulley 23-2 slides on the top end of the ice-making device support 24. The ice mold hook traction rope 23-3 is connected with the ice mold hook 23-4, and the ice mold hook traction rope 23-3 is connected with the output end of the ice mold lifter motor 23-1, so that the ice mold hook traction rope 23-3 is extended or retracted by the ice mold lifter motor 23-1.

[0061] By setting the liquid level sensor and temperature monitor in the ice mold 30, when the ice mold is deiced, the deicing water is automatically replaced in time and the deicing temperature is stable, the ice mold deicing efficiency is improved, and the ice mold deicing pool liquid level sensor controls the deicing water in and out, ensuring the operation safety.

[0062] The ice making with the above device includes the following steps:

[0063] Step S1: LNG from the LNG storage tank 1 enters the first heat exchanger 3 to exchange heat with the refrigerant, is heated by the reheater 4 after gasification, is regulated by the pressure regulator 6, is regulated by the metering device 7, and then enters the natural gas pipeline network. The first regulating valve 2 arranged between the LNG storage tank 1 and the first heat exchanger 3 regulates the flow of the incoming LNG and performs emergency shutdown. The LNG is heated and gasified by the first heat exchanger 3 to form natural gas, is further heated by the reheater 4, and then is regulated by the second regulating valve 5 arranged between the reheater 4 and the pressure regulator 6.

[0064] Step S2: The ice making water from the water adding device 18 enters the empty ice mold 12. Meanwhile, 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 salt water. The low-temperature refrigerant is circulated into the tube side of the first heat exchanger 3 after the temperature is increased. The salt water is cooled and enters the water distributor 9. The low-temperature salt water enters the ice making pool 11 to supply cold to the ice making water in the ice mold 12. The temperature of the ice making water is reduced to form ice blocks. The temperature of the low-temperature salt water is increased and enters the salt water buffer tank 14 through the water collector 13. The salt water is stirred by the stirrer 16 in the salt water buffer tank 14 until the concentration of the salt water is uniform. Then the salt water enters the shell side of the second heat exchanger 8 to exchange heat with the refrigerant. The process is repeated.

[0065] Step S3: After the ice block in the ice mold 12 is made, the data signal output by the ice block quality detector 21 is converted into an electrical signal, which is transmitted through a wire to start the ice mold lifter controller 22. The ice mold lifter controller 22 sets the operation program of the ice mold lifter 23, and the operation program is converted into an electrical signal through a wire connected to the ice mold lifter motor 23-1 to control the operation of the ice mold lifter 23. The ice mold lifter 23 translates through the pulley 23-2 to the top of the ice maker support 24 to the position above the ice mold 12 where ice making is completed, and then releases the ice mold hook 23-4 to hook the ice mold 12 by releasing the extended ice mold hook pulling rope 23-3. Then the ice mold hook pulling rope 23-3 is retracted to lift the ice mold 12 to the specified height, and then continues to translate through the pulley 23-2 to the position above the ice removal pool 30. The ice mold 12 enters the ice removal pool 30 to perform ice removal operation by releasing the ice mold hook pulling rope 23-3. After the ice block in the ice mold is removed, the ice mold becomes empty. The empty ice mold is lifted to the specified height by retracting the ice mold hook pulling rope 23-3, and then reversely translates to the position above the water adding device 18 on the left side. The empty ice mold is placed on the ground on the left side of the water adding device 18 by releasing the ice mold hook pulling rope 23-3. After the water is added to the empty ice mold, the ice mold is lifted to the specified height by retracting the ice mold hook pulling rope 23-3, and then translates to the position above the ice making pool 11. The ice mold enters the ice making pool 11 to perform ice making, and the ice mold is separated from the ice mold hook 23-4. Then the ice mold hook 23-4 is lifted to the specified height by retracting the ice mold hook pulling rope 23-3, and then translates to the initial position. The above steps are repeated in a cycle.

[0066] Step S4: The ice mold 12 containing ice blocks is subjected to ice removal in the ice removal pool 30. When the temperature of the ice removal water in the ice removal pool 30 decreases, the data signal of the temperature detector 25 is converted into an electrical signal to start the ice removal pool water outlet valve 26. The low-temperature ice removal water enters the water adding device 18 to add water to the empty ice mold through the ice removal pool water outlet valve 26. When the liquid level of the low-temperature ice removal water in the ice removal pool 30 decreases to the position of the first liquid level sensor 27, the ice removal pool water inlet valve 28 is started to add normal-temperature ice removal water to the ice removal pool 30. When the liquid level of the normal-temperature ice removal water in the ice removal pool 30 rises to the position of the second liquid level sensor 29, the ice removal pool water inlet valve 28 is closed. The above steps are automatically repeated in a cycle.

[0067] Example 1

[0068] Taking the LNG cold energy salt water ice maker with a daily output of 40 tons of ice as an example, each ice block weighs 100 kg, 2880 kWh of electricity is saved per day, 0.87 tons of standard coal is saved per day, and 2.26 tons of carbon dioxide emissions are reduced per day. The overall volume of the device is 16750mm×4130mm×3400mm, the land area and equipment cost saving ratio are 52% and 47%, respectively.

[0069] As Figure 1As shown, a LNG cold energy salt water ice making device comprises:

[0070] LNG storage tank 1, first regulating valve 2, first heat exchanger 3, reheater 4, second regulating valve 5, pressure regulator 6, meter 7, second heat exchanger 8, water distributor 9, plastic chain plate conveyor 10, ice making pool 11, ice mold 12, water collector 13, salt water buffer tank 14, stirring motor 15, stirrer 16, concentration detector 17, water feeder 18, salt water pump 19, infrared temperature detector 20, ice block quality detector 21, ice mold lifter controller 22, ice mold lifter 23, temperature detector 25, ice block discharge pool water outlet valve 26, first liquid level sensor 27, ice block discharge pool water inlet valve 28, second liquid level sensor 29, ice block discharge pool 30. The input end of the first heat exchanger 3 is in communication with the output end of the LNG storage tank 1; the input end of the reheater 4 is in communication with the tube side output end of the first heat exchanger 3; the input end of the salt water buffer tank 14 is in communication with the output end of the ice making and ice storage system; the input end of the salt water pump 19 is in communication with the output end of the salt water buffer tank 14; the tube side input end of the second heat exchanger 8 is in communication with the shell side output end of the first heat exchanger 3; the shell side input end of the second heat exchanger 8 is in communication with the output end of the salt water buffer tank 14; the tube side output end of the second heat exchanger 8 is in communication with the shell side input end of the first heat exchanger 3; the shell side output end of the second heat exchanger 8 is in communication with the input end of the ice making and ice storage system. The input end of the water feeder 18 is in communication with the output end of the ice block discharge pool 30; the input end of the water distributor 9 is in communication with the output end of the shell side of the second heat exchanger 8; the input end of the ice making pool 11 is in communication with the output end of the water distributor 9; the ice mold 12 is located inside the ice making pool 11; the input end of the water collector 13 is in communication with 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 with the ice block quality detector 21, and the ice mold lifter 23 is connected with the top end of the ice making device support 24.

[0071] The LNG cold energy salt water ice making method of the embodiment is implemented by using the above LNG cold energy salt water ice making device, and specifically comprises the following steps:

[0072] Step S1: LNG from the LNG storage tank 1 enters the first heat exchanger 3 to exchange heat with the refrigerant, is heated and gasified, is further heated by the reheater 4, is regulated in flow by the second regulating valve 5 arranged between the reheater 4 and the pressure regulator 6 after being regulated in flow by the pressure regulator 6, and enters the meter 7 to be regulated to enter the natural gas pipeline network. The first regulating valve 2 arranged between the LNG storage tank 1 and the first heat exchanger 3 regulates the flow of the LNG flowing in and performs emergency shutdown.

[0073] Step S2: ice-making water from the waterer 18 enters the empty ice mold 12, while 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 salt water, the temperature of the low-temperature refrigerant rises and circulates into the tube side of the first heat exchanger 3, the temperature of the salt water drops and enters the water distributor 9, the low-temperature salt water enters the ice-making pool 11 through the water distributor 9 to provide cooling for the ice-making water in the ice mold 12, the temperature of the ice-making water drops to form ice blocks, the temperature of the low-temperature salt water rises and enters the salt water buffer tank 14 through the water collector 13, the salt water in the salt water buffer tank 14 is stirred by the stirrer 16 until the concentration of the salt water is uniform, and then the salt water enters the shell side of the second heat exchanger 8 to exchange heat with the refrigerant, and the cycle is repeated.

[0074] Step S3: after the ice blocks in the ice mold 12 are completed, the ice block 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 through the wire and connected with the ice mold lifter motor 23-1 to control the operation of the ice mold lifter 23, the ice mold lifter 23 translates to the top of the ice-making device support 24 through the pulley 23-2 to the position above the ice mold 12 that has completed ice-making, then releases the ice mold hook traction rope 23-3 to make the ice mold hook 23-4 connect with the ice mold 12, and then retracts the ice mold hook traction rope 23-3 to lift the ice mold 12 to a specified height and continue to translate to the top of the ice removal pool 30, then releases the ice mold hook traction rope 23-3 to make the ice mold 12 enter the ice removal pool 30 for ice removal operation, the ice blocks in the ice mold are removed to form an empty ice mold, the ice mold hook traction rope 23-3 is retracted to lift the empty ice mold to a specified height, then reversely translates to the top of the left side of the waterer 18, then releases the ice mold hook traction rope 23-3 to place the empty ice mold on the ground on the left side of the waterer 18 for water filling, after the water filling of the empty ice mold is completed, the ice mold hook traction rope 23-3 is retracted to lift the water-filled ice mold to a specified height, then translates to the top of the ice-making pool empty position, then releases the ice mold hook traction rope 23-3 to make the water-filled ice mold enter the ice-making pool empty position for ice-making, and makes the water-filled ice mold separate from the ice mold hook 23-4, and then the ice mold hook traction rope 23-3 is retracted to lift the ice mold hook 23-4 to a specified height and translate to the initial position, and the cycle is repeated.

[0075] Step S4: the ice mold 12 filled with ice blocks is removed in the ice removal pool 30, when the temperature of the ice removal water in the ice removal pool 30 decreases, the data signal of the temperature detector 25 is converted into an electrical signal to start the ice removal pool water outlet valve 26, the low-temperature ice removal water enters the waterer 18 through the ice removal pool water outlet valve 26 to fill water for the empty ice mold, when the liquid level of the low-temperature ice removal water in the ice removal pool 30 decreases to the position of the first liquid level sensor 27, the ice removal pool water inlet valve 28 is started to add normal-temperature ice removal water to the ice removal pool 30, until the liquid level of the normal-temperature ice removal water in the ice removal pool 30 rises to the position of the second liquid level sensor 29, the ice removal pool water inlet valve 28 is closed, and the cycle is repeated automatically.

[0076] Embodiment 2

[0077] The LNG cold energy salt water ice making device provided in the embodiment comprises four systems, including: an LNG gasification system, a cold energy recovery system, an ice making and storing system, and an ice removing system. The LNG gasification system comprises an LNG storage tank 1, a first heat exchanger 2, and a reheater 3; the cold energy recovery system comprises a salt water buffer tank 14, a salt water pump 19, and a second heat exchanger 8; the ice making and storing system comprises a water distributor 9, an ice making pool 11, an ice mold 12, a plastic chain plate conveyor 10, a water collector 13, and a water feeder 18; the ice removing system comprises an ice block quality detector 21, an ice mold lifter controller 22, an ice mold lifter 23, and an ice removing pool 30; the salt water buffer tank 14 is internally provided with a stirrer 16 and a concentration detector 17; a stirring motor 15 is connected with the stirrer 16 and the concentration detector 17.

[0078] When the salt water concentration in the salt water buffer tank 14 produces solid precipitation, and the salt water 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 electric signal to control the stirring motor to start, and the stirrer 16 stirs the salt water until the salt water concentration reaches the set value and is stable for 4 minutes, so as to ensure the uniformity and stability of the salt water concentration and the cooling performance of the salt water.

[0079] Embodiment 3

[0080] The LNG cold energy salt water ice making device provided in the embodiment comprises four systems, including: an LNG gasification system, a cold energy recovery system, an ice making and storing system, and an ice removing system. The LNG gasification system comprises an LNG storage tank 1, a first heat exchanger 2, and a reheater 3; the cold energy recovery system comprises a salt water buffer tank 14, a salt water pump 19, and a second heat exchanger 8; the ice making and storing system comprises a water distributor 9, an ice making pool 11, an ice mold 12, a plastic chain plate conveyor 10, a water collector 13, and a water feeder 18; the ice removing system comprises an ice block quality detector 21, an ice mold lifter controller 22, an ice mold lifter 23, an ice making device support 24, and an ice removing pool 30. The ice mold lifter 23 comprises 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 end of the ice making device support 24, and the ice mold hook traction rope 23-3 is connected with the ice mold hook 23-4.

[0081] The ice molds 12 in the ice making and storing system are arranged in multiple rows and multiple columns, and an infrared temperature detector 20 (only one of which is shown in the figure) is arranged on the outer side of each row of ice molds. 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 arranged on the outer side of each row of ice molds 20 can penetrate from the first ice mold to the last ice mold. 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 as to correspondingly obtain the temperature signals (electrical signals) of each temperature measurement point.

[0082] The ice block quality detector 21 comprises an ice mold internal temperature detection module 21-1 and an ice making timing module 21-2. The two modules are connected through a line and jointly controlled to determine the completion of ice block making in the ice making pool 11. An infrared temperature detector 20 is arranged at the middle part of the outside of the ice mold 12. One infrared temperature detector 20 is arranged corresponding to 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 block quality detector 21 through a line. The infrared temperature detector 20 detects the positions of the ice molds that have been set through program setting. The infrared temperature detector 20 detects the upper middle vertical end, the middle part and the lower end of the inside of the ice mold 12. When the infrared temperature detector 20 measures the temperature, infrared energy is emitted to the upper middle vertical end, the middle part and the lower end of the inside of the ice mold 12. The infrared energy is converted into an electric 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 block quality detector 21 through a wire. The temperature readings of the inside of each ice mold 12 of the ice making pool 11 are displayed. The temperature difference data of each temperature measuring point in the inside of each ice mold 12 is displayed. It is determined whether the temperature difference of each temperature measuring point in the inside of each ice mold in each row of ice molds reaches the set standard. In addition, the ice making timing module 21-2 is started when the ice molds filled with water are placed in the ice making pool 11 to start ice making. When the ice making timing module 21-2 of the ice block quality detector 21 displays the preset time (for example, 16 hours), the set standard is reached, and the temperature difference in the inside of each ice mold 12 in one row of ice molds is ≤0.1℃, ice block quality detector 21 determines that the ice block in the ice mold is completed, and the ice block quality detector 21 converts the data signal into an electrical signal through a wire to start the ice mold lifter controller 22, the ice mold lifter controller 22 sets the operation program of the ice mold lifter 23, and the operation program is converted into an electrical signal through a wire and connected with the ice mold lifter motor 23-1 to control the operation of the ice mold lifter 23. The ice mold lifter 23 translates to the top of the ice maker support 24 through the pulley 23-2 to the position above the ice mold 12 where ice making is completed, then releases the ice mold hook traction rope 23-3 to make the ice mold hook 23-4 connected with the ice mold 12, and then retracts the ice mold hook traction rope 23-3 to lift the ice mold 12 to a specified height, and then continues to translate to the top of the ice removal pool 30, and then releases the ice mold hook traction rope 23-3 to make the ice mold 12 enter the ice removal pool 30 for ice removal operation. After the ice block in the ice mold 12 is removed, the ice mold is empty. After the ice mold hook traction rope 23-3 is retracted to lift the empty ice mold to a specified height, it is reversely translated to the top of the water adding device 18 on the left side, and then 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 adding device 18 and add water through the water adding device 18. After the water adding device 18 is added, the ice mold is lifted to a specified height, and then translated to the top of the ice making pool 11. After the ice mold hook traction rope 23-3 is released, the ice mold enters the ice making pool 11 to make ice, and the ice mold is separated from the ice mold hook 23-4. At this time, the ice mold hook traction rope 23-3 is retracted to lift the ice mold hook 23-4 to a specified height, and then translated to the initial position. Thus, the cycle is run. The embodiment can realize the automatic transfer of the ice mold 12 where ice making is completed and the empty ice mold, and improve the degree of automation of the device.

[0083] Embodiment 4

[0084] The LNG cold energy salt water ice maker provided in the embodiment comprises four systems, including an LNG gasification system, a cold energy recovery system, an ice making and storing system, and an ice removal system. The LNG gasification system comprises an LNG storage tank 1, a first heat exchanger 2, and a reheater 3. The cold energy recovery system comprises a salt water buffer tank 14, a salt water pump 19, and a second heat exchanger 8. The ice making and storing system comprises a water distributor 9, an ice making pool 11, an ice mold 12, a plastic chain plate conveyor 10, a water collector 13, and a water adding device 18. The ice removal system comprises an ice block quality detector 21, an ice mold lifter controller 22, an ice mold lifter 23, and an ice removal pool 30. The ice removal pool is provided with a first liquid level sensor 27, a second liquid level sensor 29, a temperature detector 25, an ice removal pool water inlet valve 28, and an ice removal pool water outlet valve 26.

[0085] When the temperature detector 25 shows that the temperature of the ice-off water in the ice-off pool 30 is lower than a preset value (such as 10℃), since the temperature difference between the ice-off water and the ice in the ice mold 12 is small, the ice-off water cannot exchange heat with the ice in the ice mold 12 to realize ice-off operation, and the required ice-off time is prolonged (such as 1h), so it is necessary to replace the ice-off water in the ice-off pool 30, that is, to open the ice-off pool water outlet valve 26, and low-temperature ice-off water flows out to enter the water feeder 18 to add water to the empty ice mold, and when the water volume reaches 3 / 4 of the volume of the ice mold 12, the water adding is stopped, and the ice mold is transferred to the ice making pool 11 by the ice mold lifter 23 to make ice, and since the initial temperature of the ice making water is low, the ice making time is shortened (such as 2h), and the water adding is continued in this way until the low-temperature ice-off water level of the ice-off pool 30 reaches the position of the first liquid level sensor 27 at the lower end of the outside of the ice-off pool 30, then the electric signal controls the ice-off pool water outlet valve 26 to be closed, and at the same time, the ice-off pool water inlet valve 28 is opened to add normal-temperature ice-off water of 30℃ to the ice-off pool 30, and when the normal-temperature ice-off water level of the ice-off pool 30 reaches the second liquid level sensor 29 at the upper end of the outside of the ice-off pool 30, the ice-off pool water inlet valve 28 is closed, and in this case, the ice-off time is shortened to 15min. Therefore, through the joint control of the temperature detector 25 and the valve, the automatic discharge of low-temperature ice-off water and the automatic supplement of normal-temperature ice-off water in the ice-off pool 30 are realized, and the ice making efficiency is improved, and the ice-off rate is ensured.

[0086] In the foregoing embodiment of the utility model, the brine concentration is controlled uniformly and stably in time by the stirrer 16, solid precipitate is avoided, the brine concentration is monitored at any time by the concentration detector 17, and the brine cooling performance is ensured.

[0087] In the foregoing embodiment of the utility model, the ice block quality detector is arranged, the ice block production condition is monitored at any time, and the ice mold lifter is connected to realize joint control, when the ice block production is completed, the ice mold lifter transfers the ice mold of completed ice making to the ice-off pool to carry out ice-off, then another ice mold lifter transfers the empty ice mold to the ice making pool to carry out water adding and ice making, the automatic degree of the lifting device is improved, the labor consumption is reduced, and continuous production is realized.

[0088] In the foregoing embodiment of the utility model, the plastic chain plate conveyor is arranged at the bottom of the ice mold, when the ice making is completed and the ice mold of completed ice making is transferred to the ice-off pool by the ice mold lifter, then the plastic chain plate conveyor starts to move the ice mold of incomplete ice making from the high-temperature end of the ice making pool to the low-temperature end, the ice mold and the brine form countercurrent heat exchange, the heat exchange efficiency is improved, and the ice making time is shortened.

[0089] The foregoing embodiment of the utility model discloses, through setting liquid level sensor and temperature monitor in the ice pool, when ice mold is thawed, the ice water is replaced in time automatically through temperature detection and valve control and stable ice thawing temperature, improve ice mold thawing efficiency, and the ice pool liquid level sensor controls the ice water in and out, guarantees the safe operation.

[0090] The above detailed introduction is provided for the technical scheme of the embodiment of the utility model, and the principle and implementation mode of the embodiment of the utility model are described by applying specific examples; the above embodiment is only applicable to helping understanding the principle of the embodiment of the utility model; meanwhile, for the general technical personnel in the art, according to the embodiment of the utility model, the specific implementation mode and application range will have changes, and the above is not understood as the limitation of the utility model.

Claims

1. An LNG cold energy saltwater ice making device, characterized in that, The LNG gasification system, the cold energy recovery system, the ice making and storing system and the ice removing system are included; The LNG gasification system is used for gasification of LNG and release of cold energy contained in LNG; the LNG gasification system includes an LNG storage tank and a first heat exchanger; an input end of the first heat exchanger is communicated with an output end of the LNG storage tank; The cold energy recovery system is used for recovery of cold energy generated by LNG gasification and cold supply to the ice making and storing system; the cold energy recovery system includes a brine buffer tank and a second heat exchanger; an input end of the brine buffer tank is communicated with an output end of the ice making and storing system; a tube side input end of the second heat exchanger is communicated with a shell side output end of the first heat exchanger; a shell side input end of the second heat exchanger is communicated with an output end of the brine buffer tank; a tube side output end of the second heat exchanger is communicated with a shell side input end of the first heat exchanger; and a shell side output end of the second heat exchanger is communicated with an input end of the ice making and storing system; The ice making and storing system is used for ice block making and ice storing; the ice making and storing system includes a water distributor, an ice making pool, an ice mold, a water collector and a water feeder; an input end of the water distributor is communicated with a shell side output end of the second heat exchanger; the ice making pool is used for ice block making and storing; an input end of the ice making pool is communicated with an output end of the water distributor; the ice mold is located inside the ice making pool; an input end of the water collector is communicated with an output end of the ice making pool; and the water feeder is used for water supply to the ice mold; The ice removing system is used for ice removing after ice block making; the ice removing system includes an infrared temperature detector, an ice block quality detector, an ice mold lifter controller, an ice mold lifter and an ice removing pool; the infrared temperature detector is used for monitoring temperature of the ice mold; the infrared temperature detector is connected with the ice block quality detector; the ice mold lifter is located above the ice mold and can be translated and lifted at positions of the ice making and storing system and the ice removing system; the ice mold lifter can be connected with the ice mold; the ice block quality detector is used for detecting ice blocks in the ice mold; the ice mold lifter controller is connected with the ice block quality detector and the ice mold lifter; and the ice removing pool is used for ice removing of the ice mold; an output end of the ice removing pool is communicated with an input end of the water feeder.

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

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

4. The LNG cold energy saltwater ice making device according to claim 1, characterized in that, A concentration detector and a rotatable stirrer are arranged inside the brine buffer tank; and the concentration detector is used for monitoring concentration of brine in the brine buffer tank.

5. The LNG cold energy saltwater ice making device according to claim 1, characterized in that, The ice mold in the ice making pool has multiple rows and multiple columns; the water distributor is used for low-temperature brine supply to the ice making pool to ensure that the low-temperature brine has the same temperature when entering the ice making pool.

6. The LNG cold energy saltwater ice making device according to claim 1, characterized in that, The ice making pool is spliced by PP plates and covered by a steel plate, and / or The ice making and storing system further includes a conveyor; the conveyor is located at a bottom of the ice mold and is used for ice mold pushing in the ice making pool.

7. The LNG cold energy saltwater ice making device according to claim 1, characterized in that, The ice-making and storing system further comprises an ice mold lifting device support, the ice mold lifting device comprises an ice mold lifting device motor, an ice mold hook traction rope and a connecting piece, the ice mold lifting device motor is slidingly arranged on the top of the ice-making device support and above the ice-making and storing system and the ice removing system, the ice mold hook traction rope is connected with the output end of the ice mold lifting device motor to release the elongation or recovery of the ice mold hook traction rope, and the connecting piece is connected with the ice mold hook traction rope.

8. The LNG cold energy saltwater ice making device according to claim 7, characterized in that, The connecting piece is a hook.

9. The LNG cold energy saltwater ice making device according to claim 7, characterized in that, The ice mold lifting device further comprises a pulley and a motor fixing rod, the pulley is slidingly arranged at both ends of the top of the ice-making device support, the motor fixing rod is connected with the pulleys at both ends of the ice-making device support, and the ice mold lifting device motor is fixed on the motor fixing rod.

10. The LNG cold energy saltwater ice making device according to any one of claims 1-9, characterized in that, The ice removing tank is provided with a first liquid level sensor, a second liquid level sensor, a temperature detector, an ice removing tank water inlet valve and an ice removing tank water outlet valve, the temperature detector is used for monitoring the temperature of the liquid in the ice removing tank, the first liquid level sensor and the second liquid level sensor are respectively arranged at different height positions of the ice removing tank and are used for monitoring the liquid level at different positions, and the ice removing tank water inlet valve and the ice removing tank water outlet valve are respectively used for controlling the water inlet and water outlet of the ice removing tank.

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