System for refrigerating LNG (Liquefied Natural Gas) ship by utilizing vaporized residual cold

Abstract

The invention discloses an LNG ship refrigeration system utilizing vaporization waste cold, and relates to the technical field of LNG ships, the LNG ship refrigeration system comprises an LNG engine, a supply system, a heat exchanger and an air conditioning system, the LNG engine is provided with a water tank, the supply system comprises an LNG storage tank and a vaporizer, the vaporizer comprises a heat exchange box and a vaporization pipe, the heat exchange box is provided with a closed heat exchange cavity, and the vaporization pipe is arranged in the heat exchange cavity. One end of the heat exchange cavity is communicated with an air conditioning system, the vaporization pipe is arranged in the heat exchange cavity, one end of the vaporization pipe is communicated with the LNG storage tank, and the other end of the vaporization pipe is communicated with a steam inlet of the first heat exchange box; through gradient utilization, air conditioner refrigeration, waste gas circulation and LNG engine cooling water cooling are completed, the situation that a large amount of cold energy released by LNG cannot be fully utilized through single-time utilization is avoided, and waste of the cold energy released in the LNG vaporization process can be effectively avoided.

Description

Technical Field

[0001] The invention relates to the technical field of LNG ships, in particular to a refrigeration system of an LNG ship utilizing vaporization waste cooling. Background Art

[0002] In the current field of ship propulsion, the selection and utilization of energy has a vital impact on the performance, environmental protection and safety of ships. As a clean and efficient energy source, the application of liquefied natural gas in the field of ships has gradually attracted widespread attention.

[0003] Compared with traditional fuel, LNG has significant environmental advantages. LNG combustion is safe, and its ships are also equipped with a series of exhaust gas treatment devices. The content of pollutants such as carbon monoxide and hydrocarbons in the exhaust gas is extremely low, which can meet the most stringent ship emission regulations, help reduce the pollution of the marine and atmospheric environment caused by ship operations, and is of great significance for protecting the marine ecology and responding to global climate change. At the same time, various safety valves are installed on LNG ships to effectively ensure that there will be no fire or explosion accidents in the hull under various unexpected circumstances. Its high safety performance has also been widely recognized by the industry.

[0004] However, there are still some problems in energy utilization for existing LNG ships. In the process of using LNG, a large amount of cold energy will be released from the storage state through the vaporizer and enter the ship's LNG engine, but most of this cold energy is not effectively utilized, resulting in a waste of cold energy. This waste of cold energy not only means insufficient energy utilization, but also indirectly leads to an increase in the energy consumption of the ship's refrigeration system, increases the ship's operating costs, and reduces energy utilization efficiency.

[0005] Based on the above background, developing a technology that can effectively utilize the cold released during the LNG vaporization process has important practical significance and market demand for improving the energy utilization efficiency of LNG ships and reducing operating costs. This is also the key problem that this patented technology is committed to solving. Summary of the invention

[0006] The object of the present invention is to provide a refrigeration system for an LNG ship using vaporization waste cooling to solve the problems raised in the prior art.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an LNG ship refrigeration system using vaporization waste cooling, comprising an LNG engine, a supply system, a heat exchanger, an air conditioning system and a steam cracking reaction and separator, the LNG engine having a water tank, the supply system comprising an LNG storage tank and a vaporizer, the vaporizer comprising a heat exchange box and a vaporization pipe, the heat exchange box having a closed heat exchange cavity, one end of the heat exchange cavity being connected to the air conditioning system, the vaporization pipe being built in the heat exchange cavity, one end of the vaporization pipe being connected to the LNG storage tank, and the other end of the vaporization pipe being connected to the steam inlet of the first heat exchange box; The heat exchanger comprises a first heat exchange box and a second heat exchange box, the first heat exchange box having a sealed first heat exchange chamber, one end of the first heat exchange pipe outlet of the first heat exchange box is connected to one end of the steam inlet of the second heat exchange box, one end of the first heat exchange chamber is connected to the exhaust filter, and the other end of the first heat exchange chamber is connected to the exhaust gas circulation system; The second heat exchange box includes a second heat exchange tube and a second heat exchange chamber. The second heat exchange box is connected to the water tank of the LNG engine. The second heat exchange box has a closed second heat exchange chamber. One end of the second heat exchange chamber is connected to the water tank through a hot water pipe, and the other end of the second heat exchange chamber is connected to the water tank through a cold water pipe. One end of the heat exchange box, one end of the vaporization tube, the outlet of the first heat exchange chamber and one end of the second heat exchange chamber are respectively connected to the air-conditioning system, the first heat exchange chamber, the second heat exchange chamber and the LNG engine water tank through connecting pipes, and the outer wall of each connecting pipe is provided with a protective cover.

[0008] Preferably, the exhaust gas circulation system includes an exhaust filter and an air mixer. The exhaust filter is connected to the exhaust pipe of the LNG engine, the exhaust filter is connected to the first heat exchange chamber of the first heat exchange box, the other end of the first heat exchange chamber is connected to the air mixer, and the other end of the air mixer is connected to the intake valve.

[0009] Preferably, the supply system also includes a pressure regulator and a gas mixer, the inlet of the pressure regulator is connected to the second heat exchange tube, the outlet of the pressure regulator is connected to one end of the gas mixer, the other end of the gas mixer is connected to the air mixer, and the outlet of the gas mixer is connected to the steam inlet of the LNG engine.

[0010] Preferably, the protective sleeve comprises a first thermal insulation layer, a sealing layer and a second thermal insulation layer, and the outer wall of the connecting pipe is provided with the first thermal insulation layer, the sealing layer and the second thermal insulation layer in sequence from the inside to the outside.

[0011] Preferably, a sealing mechanism is sleeved on the outer side wall of the port connection of each of the connecting tubes, and the sealing mechanism includes two arc plates and two sealing gaskets, the two arc plates are relatively buckled and detachably connected, the two arc plates in the two groups of arc plates are in a buckled state and sleeved on the outer side wall of the port connection of the connecting tube, the two sealing gaskets are respectively arranged between the two arc plates and the connecting tube and are both interference fit with the outer side wall of the port connection of the connecting tube.

[0012] Preferably, the two arc-shaped plates are respectively a first arc-shaped plate and a second arc-shaped plate; a positioning groove is provided on the first arc-shaped plate, and a clamping groove is provided on the inner side wall of the positioning groove; a limiting protrusion matching the positioning groove is formed on the second arc-shaped plate, and a clamping block is slidably provided on the limiting protrusion, and when the first arc-shaped plate is buckled with the second arc-shaped plate, the limiting protrusion is inserted into the positioning groove.

[0013] Preferably, the sealing mechanism also includes an operating member, which includes an adjusting plate, a rack, a rotating shaft, a gear and a driving member, and a receiving groove is provided on the side wall of the limiting protrusion; the adjusting plate is fixedly connected to the block, the rack is fixed to the adjusting plate, the rotating shaft is rotatably connected to the inner side wall of the receiving groove, the gear is coaxially fixed to the rotating shaft, the gear is meshed with the rack, and the driving member is connected to the rotating shaft and is used to drive the rotating shaft to rotate.

[0014] Preferably, the driving member includes a pulley, a pull rope, a slider, a pull rod and a limit bolt, the pulley is coaxially fixed on the rotating shaft, one end of the pull rope is wound around the pulley, the slider is slidably arranged on the second arc plate, the slider is fixedly connected to the other end of the pull rope, the pull rod is fixed on the slider, and the limit bolt passes through the pull rod and is threadedly connected to the pull rod.

[0015] Preferably, the sealing mechanism further comprises a return spring, one end of the return spring is fixedly connected to the adjustment plate, and the other end of the return spring is fixedly connected to the inner wall of the receiving groove.

[0016] Preferably, the steam inlet of the steam cracking reaction and separator is connected to the second heat exchange box, the CO2 steam outlet and the hydrogen outlet of the steam cracking reaction and separator are respectively connected to the exhaust filter and another pressure regulator, and the other pressure regulator is connected to the gas mixer.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. By passing the high-temperature gaseous refrigerant of the air-conditioning system into the vaporizer for heat exchange with liquid LNG, a large amount of cold energy released during the LNG vaporization process cools the high-temperature gaseous refrigerant of the air-conditioning refrigeration system, completing the LNG vaporization residual cooling refrigeration cycle. After one heat exchange, the gaseous LNG still has a relatively low temperature, and is passed into the first heat exchange box for heat exchange with the filtered LNG engine exhaust. The cooled exhaust gas and fresh intake air are passed into the air mixer and mixed together, and then mixed with the gaseous LNG and passed into the LNG engine to complete the exhaust gas cycle and reduce the emission of harmful gas NOx. The gaseous LNG is finally passed into the second heat exchange box for heat exchange with the LNG engine water tank to keep the LNG engine cooling water in a suitable working range. Through cascade utilization, air-conditioning refrigeration, exhaust gas circulation and LNG engine cooling water cooling are completed, avoiding the failure to fully utilize the large amount of cold energy released by LNG in a single utilization, and effectively avoiding the waste of cold energy released during the LNG vaporization process; 2. The hydrogen generated by steam cracking is mixed with natural gas in the LNG engine for combustion, which can accelerate the combustion rate and reduce incomplete combustion losses. The only product of hydrogen is water, which can reduce carbon emissions. The octane number of hydrogen is much higher than that of natural gas, which can increase the compression ratio of the LNG engine and improve the power performance. The steam cracking process can be driven by the waste heat of the LNG engine (200-300℃), and the system has a high energy efficiency ratio, which promotes the cascade utilization of energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of an embodiment of a refrigeration system for an LNG ship using vaporization waste cooling provided by the present invention; Figure 2 yes Figure 1 A schematic diagram of the structure of the connecting pipe and the protective sleeve; Figure 3 is a schematic diagram of the structure of the sealing mechanism in a buckled state; Figure 4 yes Figure 3 A partial enlarged view of the middle area A; Figure 5 yes Figure 3 A partial enlarged view of the middle area B; Figure 6 yes Figure 3 A schematic diagram of the matching relationship between the adjusting plate, rack, gear and rotating shaft; Figure 7 yes Figure 3 Schematic diagram of the three-dimensional structure of the sealing mechanism in the disassembled state.

[0019] Numbers in the figure: 1, LNG engine; 2, supply system; 3, heat exchanger; 4, air conditioning system; 5, exhaust gas circulation system; 6, connecting pipe; 7, protective cover; 8, sealing mechanism; 21, LNG storage tank; 22, vaporizer; 221, heat exchange box; 222, vaporization pipe; 23, pressure regulator; 24, gas mixer; 31, first heat exchange box; 311, first heat exchange cavity; 312, first heat exchange tube; 32, second heat exchange box; 321, second heat exchange tube; 322, second heat exchange cavity; 41, refrigerant storage tank; 42, expansion valve; 43, evaporator; 44, compressor; 45, condenser; 51, exhaust Air filter; 52, atmospheric environment; 53, air intake valve; 54, air mixer; 71, first insulation layer; 72, sealing layer; 73, second insulation layer; 81, sealing gasket; 82, first arc plate; 821, positioning groove; 8211, clamping groove; 83, second arc plate; 831, limiting protrusion; 8311, receiving groove; 84, clamping block; 85, adjusting plate; 851, rack; 86, rotating shaft; 87, gear; 88, driving member; 881, reel; 882, pull rope; 883, slider; 884, pull rod; 885, limiting bolt; 89, reset spring; 9, steam cracking reaction and separator. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Example: Please refer to Figure 1 The present invention provides a refrigeration system for an LNG ship using vaporization waste cooling, comprising an LNG engine 1, a supply system 2, a heat exchanger 3, an air conditioning system 4 and a steam cracking reaction and separator 9, wherein the LNG engine 1 has a water tank, the water tank has a closed water storage chamber for containing cooling water, the supply system 2 is used to supply gaseous methane as fuel to the LNG engine 1, the supply system 2 comprises an LNG storage tank 21 and a vaporizer 22, the vaporizer 22 comprises a heat exchange box 221 and a vaporization pipe 222, the heat exchange box 221 has a closed heat exchange chamber, one end of the heat exchange chamber is connected to the air conditioning system 4, the vaporization pipe 222 is built in the heat exchange chamber, one end of the vaporization pipe 222 is connected to the LNG storage tank 21, and the other end of the vaporization pipe 222 is connected to the steam inlet of the first heat exchange box 31; The heat exchanger 3 includes a first heat exchange box 31 and a second heat exchange box 32. The first heat exchange box 31 has a sealed first heat exchange chamber 311. One end of the outlet of the first heat exchange tube 312 of the first heat exchange box 31 is connected to one end of the steam inlet of the second heat exchange box 32. One end of the first heat exchange chamber 311 is connected to the exhaust filter 51, and the other end of the first heat exchange chamber 311 is connected to the exhaust gas circulation system 5. The second heat exchange box 32 includes a second heat exchange tube 321 and a second heat exchange chamber 322. The second heat exchange box 32 is connected to the water tank of the LNG engine 1. The second heat exchange box 32 has a closed second heat exchange chamber 322. One end of the second heat exchange chamber 322 is connected to the water tank through a hot water pipe, and the other end of the second heat exchange chamber is connected to the water tank through a cold water pipe.

[0022] Please refer to Figure 1 The supply system 2 further includes a pressure regulator 23 , an inlet of the pressure regulator 23 is connected to the second heat exchange pipe 321 , and an outlet of the pressure regulator 23 is connected to one end of the gas mixer 24 .

[0023] Please refer to Figure 1 The supply system 2 also includes a gas mixer 24, one end of the gas mixer 24 is connected to the outlet of the pressure regulator 23, the other end of the gas mixer 24 is connected to the air mixer 54, and the outlet of the gas mixer 24 is connected to the steam inlet of the LNG engine 1.

[0024] Please refer to Figure 1 The exhaust gas circulation system 5 includes an exhaust filter 51 and an air mixer 54. The exhaust filter 51 is connected to the exhaust pipe of the LNG engine 1. The exhaust filter 51 is connected to the first heat exchange chamber 311 of the first heat exchange box 31. The other end of the first heat exchange chamber 311 is connected to the air mixer 54. The other end of the air mixer 54 is connected to the intake valve 53.

[0025] Furthermore, one end of the vaporizer heat exchange box 221, one end of the vaporization tube 222, the outlet of the first heat exchange chamber 311 and one end of the second heat exchange chamber 322 are respectively connected to the air-conditioning system 4, the first heat exchange chamber 311, the second heat exchange chamber 322 and the water tank of the LNG engine 1 through a connecting pipe 6, and a protective cover 7 is provided on the outer wall of each connecting pipe 6. The protective cover 7 includes a first insulation layer 71, a sealing layer 72 and a second insulation layer 73. The outer wall of the connecting pipe 6 is provided with a first insulation layer 71, a sealing layer 72 and a second insulation layer 73 from the inside to the outside, thereby improving the insulation effect of the connecting pipe 6 to reduce the loss of cold.

[0026] For further information, please refer to Figure 2 - Figure 7A sealing mechanism 8 is sleeved on the outer wall of the port connection of each connecting pipe 6. The sealing mechanism 8 includes two arc plates and two sealing gaskets 81. The two arc plates are relatively buckled and detachably connected. The two arc plates are in a buckled state and sleeved on the outer wall of the port connection of the connecting pipe 6. The two sealing gaskets 81 are respectively arranged between the two arc plates and the connecting pipe 6 and are both interference fit with the outer wall of the port connection of the connecting pipe 6.

[0027] Please refer to Figure 3 - Figure 7 The two arc plates are respectively a first arc plate 82 and a second arc plate 83; a positioning groove 821 is provided on the first arc plate 82, and a clamping groove 8211 is provided on the inner side wall of the positioning groove 821; a limiting protrusion 831 matching with the positioning groove 821 is formed on the second arc plate 83, and a clamping block 84 is slidably provided on the limiting protrusion 831. When the first arc plate 82 and the second arc plate 83 are buckled, the limiting protrusion 831 is inserted into the positioning groove 821; the sealing mechanism 8 also includes an operating member, which is connected to the clamping block 84 and is used to drive the clamping block 84 to move so that the clamping block 84 is clamped into the clamping groove 8211, thereby fixing the first arc plate 82 and the second arc plate 83.

[0028] Please refer to Figure 3 - Figure 7 , a receiving groove 8311 is provided on the side wall of the limiting protrusion 831; the operating member includes an adjusting plate 85, a rack 851, a rotating shaft 86, a gear 87 and a driving member 88, the adjusting plate 85 is fixedly connected to the block 84, the rack 851 is fixed on the adjusting plate 85, the rotating shaft 86 is rotatably connected to the inner side wall of the receiving groove 8311, the gear 87 is coaxially fixed on the rotating shaft 86, the gear 87 is meshed with the rack 851, and the driving member 88 is connected to the rotating shaft 86 and is used to drive the rotating shaft 86 to rotate.

[0029] Please refer to Figure 3 - Figure 7 The driving member 88 includes a wheel 881, a pull rope 882, a slider 883, a pull rod 884 and a limiting bolt 885. The wheel 881 is coaxially fixed on the rotating shaft 86. One end of the pull rope 882 is wound around the wheel 881. The slider 883 is slidably set on the second arc plate 83. The slider 883 is fixedly connected to the other end of the pull rope 882. The pull rod 884 is fixed on the slider 883. The limiting bolt 885 passes through the pull rod 884 and is threadedly connected to the pull rod 884. The limiting bolt 885 is used to abut against the side wall of the second arc plate 83 to prevent the pull rod 884 from moving through the friction resistance between the limiting bolt 885 and the second arc plate 83.

[0030] Please refer to Figure 3 - Figure 7The sealing mechanism 8 further includes a return spring 89 , one end of which is fixedly connected to the adjustment plate 85 , and the other end of which is fixedly connected to the inner wall of the receiving groove 8311 .

[0031] Please refer to Figure 1 The steam inlet of the steam cracking reaction and separator 9 is connected to the second heat exchange box 32, and the CO2 steam outlet and hydrogen outlet of the steam cracking reaction and separator 9 are respectively connected to the exhaust filter 51 and another pressure regulator 23, and the other pressure regulator 23 is connected to the gas mixer 24. The fully vaporized natural gas is passed into the steam cracking reaction and separator, and reacts under high temperature and high pressure to generate hydrogen, carbon dioxide and a small amount of carbon monoxide, wherein the hydrogen is passed into the air mixer through the separator, and the flow of hydrogen and natural gas is controlled by the pressure regulator 23, wherein the hydrogen passing into the gas mixer 24 accounts for the majority, and the natural gas accounts for a small amount, and the gas in the gas mixer is mixed and passed into the LNG engine for combustion. The carbon dioxide, water vapor, etc. separated by the separator pass through the exhaust filter 51 together with the exhaust gas of the LNG engine, and then pass into the first heat exchanger 31 to realize heat exchange.

[0032] In order to better understand the present invention, the following Figure 1 - Figure 7The working process of the LNG ship refrigeration system using vaporization waste cooling provided by the present invention is described in detail: when in use, after the ship is started, the LNG liquid in the LNG storage tank 21 is released into the vaporization pipe 222 through the pressure in the LNG storage tank 21 itself. In the vaporization pipe 222, due to volume expansion, the liquid LNG gradually changes into gaseous natural gas, and in this process, it absorbs external heat; the natural gas that still has a relatively low temperature after vaporization exchanges heat with the first heat exchange box 31 to cool the exhaust gas filtered by the exhaust filter 51; the gaseous natural gas with a temperature lower than normal temperature exchanges heat with the cooling water of the LNG engine through the second heat exchange box 32 to absorb the heat of the hot water; the fully vaporized natural gas is passed into the steam The steam cracking reaction and separator 9 react to generate hydrogen, carbon dioxide and a small amount of carbon monoxide under high temperature and high pressure environment, wherein the hydrogen is passed into the air mixer 54 through the separator, and the flow of hydrogen and natural gas is controlled by the pressure regulator 23, wherein the hydrogen passed into the gas mixer 24 accounts for the majority, and the natural gas accounts for a small amount, and the fresh air sucked in through the intake valve 53 is mixed in the air mixer 54 and then passed into the gas mixer 24, and the natural gas and the mixed air are mixed in the gas mixer 24 and then enter the LNG engine 1, thereby providing fuel for the LNG engine 1; the carbon dioxide, water vapor, etc. separated by the separator pass through the exhaust filter 51 together with the LNG engine exhaust gas, and then pass into the first heat exchanger 31 to realize heat exchange. The liquid refrigerant of the air-conditioning system 4 passes through the expansion valve 42, evaporates in the evaporator 43 and absorbs heat to become a gaseous refrigerant, thereby achieving refrigeration. The high-temperature gas refrigerant compressed by the compressor 44 absorbs heat in the vaporizer 22 and becomes a liquid refrigerant, and then returns to the refrigerant storage tank 41 to complete the cycle. When the ship is close to the dock and is not moving, when the LNG supply is small, the high-temperature gaseous refrigerant compressed by the compressor 44 is passed into the condenser 45, and the refrigeration cycle can be completed normally to achieve refrigeration. In the exhaust gas circulation system 5, the high-temperature exhaust gas generated by the LNG engine 1 is passed into the exhaust filter 51 for filtration, and then the filtered exhaust gas is passed into the first heat exchange box for heat exchange with the gaseous natural gas with a lower temperature. The cooled exhaust gas The exhaust gas is passed into the air mixer, mixed with the fresh air sucked in by the intake valve, and then passed into the gas mixer to be fully mixed with the natural gas, and finally enters the LNG engine 1 to provide fuel for the LNG engine. The combustion temperature and combustion speed in the LNG engine 1 are reduced through the exhaust gas circulation to reduce the generation of NOx. At the same time, the high-temperature exhaust gas can be used to absorb the coldness of the gaseous LNG with a lower temperature. When the exhaust gas demand is small, the cooled exhaust gas can be discharged into the atmospheric environment 52 through another passage; the gaseous natural gas that has undergone two heat exchanges is passed into the second heat exchange box 32 to exchange heat with the cooling water of the LNG engine 1, absorb the heat in the cooling water, and keep the cooling water of the LNG engine 1 in a suitable working range.

[0033] The working principle of the sealing mechanism 8 is as follows: the first arc plate 82 and the second arc plate 83 are sleeved on the port connection of the connecting pipe 6, the limiting protrusion 831 of the second arc plate 83 is inserted into the positioning groove 821 of the first arc plate 82, and then the pull rod 884 is pulled to drive the slider 883 to move, the slider 883 drives the pull rope 882 to retract, the pull rope 882 pulls the wire wheel 881 to rotate, the wire wheel 881 drives the rotating shaft 86 to rotate, the rotating shaft 86 drives the gear 87 to rotate, the gear 87 drives the rack 851 to move, the rack 851 drives the adjusting plate 85 to move, and the adjusting plate 85 drives the clamping block 84 to move so that the clamping block 84 is clamped into the clamping groove 8211 on the first arc plate 82, and then the limiting bolt 885 is tightened to fix the position of the pull rod 884, thereby realizing the fixation of the first arc plate 82 and the second arc plate 83, so as to seal and protect the port connection of the connecting pipe 6 through the sealing gasket 81. When it is necessary to disassemble the first curved plate 82 and the second curved plate 83, it is only necessary to loosen the limit bolt 885. Under the action of the elastic restoring force of the reset spring 89, the adjustment plate 85 moves downward, so that the block 84 leaves the slot 8211 on the first curved plate 82, and then the first curved plate 82 and the second curved plate 83 can be pulled apart.

[0034] In summary, the present invention realizes heat exchange by using the cold energy released during LNG vaporization to cool the refrigerant of the air-conditioning system. The cold air after passing through the evaporator can exchange heat with the air in the cabin to reduce the temperature in the cabin and realize refrigeration. The cold energy released during LNG vaporization can also be used to cool the exhaust gas of the exhaust gas circulation system and the cooling water of the LNG engine. The cooled exhaust gas can reduce NOx emissions through exhaust gas recirculation. The LNG engine cooling water absorbs the cold energy released by LNG vaporization to maintain a suitable working range. This process is fully utilized through cascade utilization, thereby avoiding the waste of the cold energy released during LNG vaporization.

[0035] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. An LNG ship refrigeration system using vaporization waste cooling, characterized in that: It includes an LNG engine, a supply system, a heat exchanger, an air conditioning system and a steam cracking reaction and separator, wherein the LNG engine has a water tank, the supply system includes an LNG storage tank and a vaporizer, the vaporizer includes a heat exchange box and a vaporization pipe, the heat exchange box has a closed heat exchange chamber, one end of the heat exchange chamber is connected to the air conditioning system, the vaporization pipe is built in the heat exchange chamber, one end of the vaporization pipe is connected to the LNG storage tank, and the other end of the vaporization pipe is connected to the steam inlet of the first heat exchange box; The heat exchanger comprises a first heat exchange box and a second heat exchange box, the first heat exchange box having a sealed first heat exchange chamber, one end of the first heat exchange pipe outlet of the first heat exchange box is connected to one end of the steam inlet of the second heat exchange box, one end of the first heat exchange chamber is connected to the exhaust filter, and the other end of the first heat exchange chamber is connected to the exhaust gas circulation system; The second heat exchange box includes a second heat exchange tube and a second heat exchange chamber. The second heat exchange box is connected to the water tank of the LNG engine. The second heat exchange box has a closed second heat exchange chamber. One end of the second heat exchange chamber is connected to the water tank through a hot water pipe, and the other end of the second heat exchange chamber is connected to the water tank through a cold water pipe. One end of the heat exchange box, one end of the vaporization tube, the outlet of the first heat exchange chamber and one end of the second heat exchange chamber are respectively connected to the air conditioning system, the first heat exchange chamber, the second heat exchange chamber and the LNG engine water tank through a connecting pipe, and a protective sleeve is provided on the outer wall of each connecting pipe; The exhaust gas circulation system includes an exhaust filter and an air mixer, wherein the exhaust filter is connected to the exhaust pipe of the LNG engine, the exhaust filter is connected to the first heat exchange chamber of the first heat exchange box, the other end of the first heat exchange chamber is connected to the air mixer, and the other end of the air mixer is connected to the intake valve; The supply system further includes a pressure regulator and a gas mixer, wherein the inlet of the pressure regulator is communicated with the second heat exchange pipe, the outlet of the pressure regulator is communicated with one end of the gas mixer, the other end of the gas mixer is communicated with the air mixer, and the outlet of the gas mixer is communicated with the steam inlet of the LNG engine; The steam inlet of the steam cracking reaction and separator is connected to the second heat exchange box, the CO steam outlet and the hydrogen outlet of the steam cracking reaction and separator are respectively connected to the exhaust filter and another pressure regulator, and the other pressure regulator is connected to the gas mixer.

2. The LNG ship refrigeration system using vaporization waste cooling according to claim 1 is characterized in that: The protective sleeve comprises a first heat-insulating layer, a sealing layer and a second heat-insulating layer, and the outer wall of the connecting pipe is provided with the first heat-insulating layer, the sealing layer and the second heat-insulating layer in sequence from the inside to the outside.

3. The LNG ship refrigeration system using vaporization waste cooling according to claim 2 is characterized in that: A sealing mechanism is sleeved on the outer side wall of the port connection of each connecting pipe, and the sealing mechanism includes two arc plates and two sealing gaskets. The two arc plates are relatively buckled and detachably connected. The two arc plates in the two groups of arc plates are in a buckled state and are sleeved on the outer side wall of the port connection of the connecting pipe. The two sealing gaskets are respectively arranged between the two arc plates and the connecting pipe and are both interference fit with the outer side wall of the port connection of the connecting pipe.

4. The LNG ship refrigeration system using vaporization waste cooling according to claim 3 is characterized in that: The two arc-shaped plates are respectively a first arc-shaped plate and a second arc-shaped plate; a positioning groove is provided on the first arc-shaped plate, and a clamping groove is provided on the inner side wall of the positioning groove; a limiting protrusion matching the positioning groove is formed on the second arc-shaped plate, and a clamping block is slidably provided on the limiting protrusion, and when the first arc-shaped plate is buckled with the second arc-shaped plate, the limiting protrusion is inserted into the positioning groove.

5. The LNG ship refrigeration system using vaporization waste cooling according to claim 4 is characterized in that: The sealing mechanism also includes an operating member, which includes an adjusting plate, a rack, a rotating shaft, a gear and a driving member. A receiving groove is provided on the side wall of the limiting protrusion; the adjusting plate is fixedly connected to the block, the rack is fixed to the adjusting plate, the rotating shaft is rotatably connected to the inner side wall of the receiving groove, the gear is coaxially fixed to the rotating shaft, the gear is meshed with the rack, and the driving member is connected to the rotating shaft and is used to drive the rotating shaft to rotate.

6. The LNG ship refrigeration system using vaporization waste cooling according to claim 5 is characterized in that: The driving member includes a wire wheel, a pull rope, a slider, a pull rod and a limit bolt. The wire wheel is coaxially fixed on the rotating shaft. One end of the pull rope is wound around the wire wheel. The slider is slidably arranged on the second arc plate. The slider is fixedly connected to the other end of the pull rope. The pull rod is fixed on the slider, and the limit bolt passes through the pull rod and is threadedly connected to the pull rod.

7. The LNG ship refrigeration system using vaporization waste cooling according to claim 5 is characterized in that: The sealing mechanism further comprises a return spring, one end of which is fixedly connected to the adjustment plate, and the other end of which is fixedly connected to the inner side wall of the receiving groove.

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