Quick freezing device and freezing method for cold recovery of LNG (Liquefied Natural Gas)
By designing the LNG cold recovery quick freezing device, the cold energy of liquefied natural gas is stored in the refrigerant and the cargo is quickly frozen through heat exchange, which solves the problem of large electricity consumption of traditional refrigeration and quick freezing equipment and realizes the LNG cold energy Effective utilization and energy conservation.
Patent Information
- Application Number
- CN202411365966.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2024-12-27
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Traditional refrigeration and quick-freezing equipment consumes a lot of power, resulting in the inability to effectively utilize the cold energy released during gasification of liquefied natural gas (LNG), causing energy waste.
Design a LNG cold recovery rapid freezing device, through the circulation circuit of the LNG storage tank, the first heat exchanger and the gasifier, the liquefied natural gas and the refrigerant are heat exchanged, and the released cold energy is stored in the refrigerant, and the refrigerant is stored. The heat exchange of goods is achieved through multi-layer structure shelves and pallets.
The full utilization of LNG gasification cooling energy is achieved, and the power consumption is smaller than the traditional refrigeration and quick-freezing method, which improves the energy utilization efficiency.
Smart Images
Figure CN119196529A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of refrigeration, in particular to an LNG cold recovery rapid freezing device and a freezing method. Background Art
[0002] Liquefied natural gas (LNG) has attracted the attention of countries around the world for its high efficiency, energy saving, small size, convenient transportation, clean and environmentally friendly characteristics, and has become an important strategic reserve energy. When LNG is gasified, a large amount of cold energy is released, about 830-860KJ / kg, which is equivalent to about 231kwh / t of electricity. If the cold energy released when LNG is gasified cannot be effectively utilized, it will cause great waste. The traditional refrigeration and quick-freezing industry is a large power consumer. According to relevant statistics, the current electricity consumed by refrigeration equipment accounts for 15% of the world's total power generation. Therefore, using LNG cold energy for refrigeration will be a major measure for energy conservation and emission reduction. Quick-freezing equipment requires a lower temperature and is a high-energy consumption equipment. Combining LNG cold energy with quick-freezing equipment can make full use of the low-temperature cold energy of LNG and achieve energy conservation and consumption reduction of quick-freezing equipment. Summary of the invention
[0003] The purpose of the present invention is to provide an LNG cold recovery rapid freezing device and freezing method, which releases a large amount of cold energy when LNG is vaporized and is used for rapid freezing equipment, so as to fully utilize the cold energy of LNG vaporization and solve the problem of high power consumption of traditional refrigeration and rapid freezing methods.
[0004] The technical solution adopted by the present invention to solve its technical problems is: an LNG cold recovery rapid freezing device, comprising an LNG storage tank, a first heat exchanger and a vaporizer which are arranged in sequence and connected by pipelines. After the liquefied natural gas in the LNG storage tank enters the first heat exchanger through the pipeline, it exchanges heat with the refrigerant located in the first heat exchanger, and then enters the vaporizer through the pipeline to complete gasification and enters the gas supply network; the first heat exchanger also forms a circulation loop with the second heat exchanger through the pipeline, the second heat exchanger has a fast opening and closing door, the inner side of the second heat exchanger has two multi-layer shelves with refrigerant flowing inside, the shelves have a refrigerant inlet and a refrigerant outlet extending out of the second heat exchanger, and a cargo rack is provided between the two shelves, the cargo rack has trays evenly arranged from top to bottom, and the trays extend between the layers of the shelves; the refrigerant in the first heat exchanger enters each layer of the shelf through the refrigerant inlet, and exchanges heat with the cargo located on the tray to achieve rapid freezing of the cargo.
[0005] Furthermore, one end of the door is hingedly connected to the second heat exchanger, and a quick-opening clamping knob is provided between the other end of the door and the second heat exchanger.
[0006] Furthermore, the shelf includes two main vertical tubes, a plurality of transverse tubes and a plurality of auxiliary vertical tubes, the plurality of transverse tubes and the plurality of auxiliary vertical tubes are located between the two main vertical tubes, and the transverse tubes located at the same height form a quick-freezing pipe network, and the tray extends between the upper and lower adjacent quick-freezing pipe networks.
[0007] Furthermore, the cargo rack includes a bracket and a pallet, the pallet is arranged on the left side wall and the right side wall of the bracket, and the pallets on the left and right sides are symmetrically arranged with the bracket as the center.
[0008] Furthermore, a sliding connection structure is provided between the bottom of the bracket and the bottom of the second heat exchanger.
[0009] Furthermore, the sliding connection structure includes wheels and tracks, the track is fixedly connected to the bottom of the second heat exchanger through a track support frame, and the wheel is rotatably mounted on the bottom of the support frame and rolls along the track.
[0010] Furthermore, the track is an inverted V-shaped structure, and the outer wall of the wheel has a V-shaped annular groove that is adapted to the shape of the track.
[0011] Furthermore, it also includes an in-and-out drive mechanism, which includes a cylinder, a cylinder barrel of the cylinder is fixed to the bottom of the inner cavity of the second heat exchanger, and a piston rod of the cylinder is fixedly connected to the bracket, and the cargo rack is driven in and out of the second heat exchanger through the in-and-out drive mechanism.
[0012] The present invention also provides an LNG cold recovery rapid freezing method, comprising the following steps: S1. Storage of cold energy The liquefied natural gas in the LNG storage tank is input into the first heat exchanger so that heat exchange is performed between the liquefied natural gas and the secondary refrigerant; S2. Import of goods Place the goods to be quick-frozen on the pallet, push the goods placement rack into the second heat exchanger, and close the door; S3, quick freezing The coolant in the first heat exchanger is input into the shelf in the second heat exchanger to quickly freeze the goods on the cargo placement shelf; S4. Output of goods After quick freezing is completed, the hatch is opened and the cargo rack is pushed out of the second heat exchanger.
[0013] The beneficial effect of the present invention is that the present invention stores the cold energy released in the gasification process of liquefied natural gas in the refrigerant, and realizes the quick freezing of the goods through heat exchange between the refrigerant and the goods. Compared with the traditional refrigeration quick freezing method, the present invention consumes less electricity. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a structural principle diagram of the present invention; Figure 2 This is the front view of the internal structure of the second heat exchanger; Figure 3 is a side view of the internal structure of the second heat exchanger; In the figure: 1 LNG storage tank, 2 first heat exchanger, 3 second heat exchanger, 31 refrigerant inlet, 32 refrigerant outlet, 33 quick-open clamping knob, 34 hatch, 35 shelf, 351 main vertical pipe, 352 cross pipe, 353 auxiliary vertical pipe, 36 track support frame, 37 track, 4 vaporizer, 5 cargo placement rack, 51 bracket, 52 pallet, 53 wheel. DETAILED DESCRIPTION
[0015] like Figures 1 to 3 As shown, the present invention includes an LNG storage tank 1, a first heat exchanger 2, a second heat exchanger 3 and a vaporizer 4. The structure and working principle of the present invention are described in detail below in conjunction with the accompanying drawings.
[0016] like Figure 1 As shown, an LNG cold recovery rapid freezing device includes an LNG storage tank 1, a first heat exchanger 2 and a vaporizer 4 which are arranged in sequence and connected by pipelines. After the liquefied natural gas in the LNG storage tank 1 enters the first heat exchanger 2 through the pipeline, it exchanges heat with the refrigerant in the first heat exchanger 2, and then enters the vaporizer 4 through the pipeline to complete the vaporization and enter the gas supply network. The first heat exchanger 2 also forms a circulation loop with the second heat exchanger 3 through the pipeline, and a pump is provided on the pipeline between the outlet of the first heat exchanger 2 and the inlet of the second heat exchanger 3 to control the flow of the refrigerant entering the second heat exchanger 3. Figure 2 , Figure 3 As shown, the second heat exchanger 3 has a quick-opening and quick-closing door 34, and the second heat exchanger 3 has two multi-layered shelves 35 inside which coolant flows, and the shelves 35 have a coolant inlet 31 and a coolant outlet 32 extending out of the second heat exchanger 3, and a cargo rack 5 is provided between the two shelves 35, and the cargo rack 5 has trays 52 evenly arranged from top to bottom, and the trays 52 extend between the layers of the shelves 35. The coolant in the first heat exchanger 2 enters each layer of the shelf 35 through the coolant inlet 31, and performs heat exchange with the cargo on the tray 52 to achieve quick freezing of the cargo.
[0017] In order to realize quick opening and closing of the hatch 34 , one end of the hatch 34 is hingedly connected to the second heat exchanger 3 , and a quick opening and tightening knob 33 is provided between the other end of the hatch 34 and the second heat exchanger 3 .
[0018] like Figure 2 , Figure 3As shown, the shelf 35 includes two main vertical pipes 351, a plurality of transverse pipes 352 and a plurality of secondary vertical pipes 353. The plurality of transverse pipes 352 and the plurality of secondary vertical pipes 353 are located between the two main vertical pipes 351, and the transverse pipes 352 located at the same height form a quick-freezing pipe network. The secondary vertical pipes 353 connect the two layers of quick-freezing pipe networks adjacent to each other, and the tray 52 extends between the two layers of quick-freezing pipe networks adjacent to each other to perform heat exchange with the quick-freezing pipe networks. The cargo placement rack 5 includes a bracket 51 and a tray 52. The tray 52 is arranged on the left and right walls of the bracket 51, and the trays 52 on the left and right sides are symmetrically arranged with the bracket 51 as the center. A sliding connection structure is provided between the bottom of the bracket 51 and the bottom of the second heat exchanger 3. The sliding connection structure includes a wheel 53 and a track 37. The track 37 is fixedly connected to the bottom of the second heat exchanger 3 through a track support frame 36, and the wheel 53 is rotatably installed at the bottom of the bracket 51 and rolls along the track 37. The track 37 is an inverted V-shaped structure, and the outer wall of the wheel 53 has a V-shaped annular groove that matches the shape of the track 37.
[0019] In order to facilitate the cargo rack 5 to enter and exit the second heat exchanger 3, the present invention further includes an in-and-out driving mechanism, which includes a cylinder, the cylinder barrel of the cylinder is fixed to the bottom of the inner cavity of the second heat exchanger 3, and the piston rod of the cylinder is fixedly connected to the bracket 51, and the cargo rack 5 is driven to enter and exit the second heat exchanger 3 by the in-and-out driving mechanism. The linear movement of an object driven by a cylinder is a prior art and will not be described in detail.
[0020] The present invention also provides an LNG cold recovery rapid freezing method, comprising the following steps: S1. Storage of cold energy The liquefied natural gas in the LNG storage tank 1 is input into the first heat exchanger 3, so that heat exchange is performed between the liquefied natural gas and the secondary refrigerant; S2. Import of goods Place the goods to be quick-frozen on the tray 52, push the goods placement rack 5 into the second heat exchanger 3, and close the door 34; S3, quick freezing The coolant in the first heat exchanger 2 is input into the shelf 35 in the second heat exchanger 3 to quickly freeze the goods on the goods placement rack 5; S4. Output of goods After quick freezing is completed, the hatch 34 is opened and the cargo placement rack 5 is pushed out of the second heat exchanger 3 .
[0021] The present invention stores the cold energy released during the gasification process of liquefied natural gas in a refrigerant, and performs heat exchange between the refrigerant and the cargo, thereby achieving quick freezing of the cargo. Compared with the traditional refrigeration quick freezing method, the present invention consumes less electricity.
Claims
1. An LNG cold recovery rapid freezing device, characterized in that: The invention comprises an LNG storage tank, a first heat exchanger and a vaporizer which are arranged in sequence and connected by pipelines. After the liquefied natural gas in the LNG storage tank enters the first heat exchanger through the pipeline, the liquefied natural gas exchanges heat with the refrigerant in the first heat exchanger, and then enters the vaporizer through the pipeline to complete gasification and then enters the gas supply network; the first heat exchanger also forms a circulation loop with the second heat exchanger through the pipeline, the second heat exchanger has a quick-opening and quick-closing door, the inner side of the second heat exchanger has two multi-layer shelves for circulating refrigerant inside, the shelves have a refrigerant inlet and a refrigerant outlet extending out of the second heat exchanger, a cargo rack is provided between the two shelves, the cargo rack has pallets evenly arranged from top to bottom, the pallets extend between the layers of the shelves; the refrigerant in the first heat exchanger enters each layer of the shelf through the refrigerant inlet, exchanges heat with the cargo on the pallet to achieve quick freezing of the cargo.
2. The LNG cold recovery rapid freezing device according to claim 1, characterized in that: One end of the door is hingedly connected to the second heat exchanger, and a quick-opening and tightening knob is provided between the other end of the door and the second heat exchanger.
3. The LNG cold recovery rapid freezing device according to claim 1, characterized in that: The shelf comprises two main vertical pipes, a plurality of transverse pipes and a plurality of auxiliary vertical pipes, wherein the plurality of transverse pipes and the plurality of auxiliary vertical pipes are located between the two main vertical pipes, and the transverse pipes located at the same height form a quick-freezing pipe network, and the tray extends between the upper and lower adjacent quick-freezing pipe networks.
4. The LNG cold recovery rapid freezing device according to claim 1, characterized in that: The cargo placement rack comprises a bracket and a tray. The tray is arranged on the left and right walls of the bracket, and the trays on the left and right sides are symmetrically arranged with the bracket as the center.
5. The LNG cold recovery rapid freezing device according to claim 1, characterized in that: A sliding connection structure is provided between the bottom of the bracket and the bottom of the second heat exchanger.
6. The LNG cold recovery rapid freezing device according to claim 5, characterized in that: The sliding connection structure comprises wheels and tracks. The tracks are fixedly connected to the bottom of the second heat exchanger via a track support frame. The wheels are rotatably mounted on the bottom of the support frame and roll along the tracks.
7. The LNG cold recovery rapid freezing device according to claim 6, characterized in that: The track is an inverted V-shaped structure, and the outer wall of the wheel has a V-shaped annular groove adapted to the shape of the track.
8. The LNG cold recovery rapid freezing device according to claim 7, characterized in that: It also includes an in-and-out drive mechanism, which includes a cylinder, a cylinder barrel of the cylinder is fixed to the bottom of the inner cavity of the second heat exchanger, and a piston rod of the cylinder is fixedly connected to the bracket. The cargo rack is driven in and out of the second heat exchanger through the in-and-out drive mechanism.
9. The rapid freezing method of the LNG cold recovery rapid freezing device according to claim 1, characterized in that: The following steps are involved: S1. Storage of cold energy The liquefied natural gas in the LNG storage tank is input into the first heat exchanger so that heat exchange is performed between the liquefied natural gas and the secondary refrigerant; S2. Import of goods Place the goods to be quick-frozen on the pallet, push the goods placement rack into the second heat exchanger, and close the door; S3, quick freezing The coolant in the first heat exchanger is input into the shelf in the second heat exchanger to quickly freeze the goods on the cargo placement shelf; S4. Output of goods After quick freezing is completed, the hatch is opened and the cargo rack is pushed out of the second heat exchanger.