BOG (Boil Off Gas) adsorption, storage and management system of LNG (Liquefied Natural Gas) automobile or small dual-fuel ship

Abstract

The utility model relates to a BOG adsorption storage and management system of an LNG automobile or a small-sized dual-fuel ship, which comprises an LNG storage tank, a buffer container, an ANG storage tank, a dual-fuel engine and an LNG vaporization heating unit, a gas phase channel of the LNG storage tank is respectively connected with the ANG storage tank and the buffer container, and a liquid phase channel of the LNG storage tank is connected with the buffer container; the LNG vaporization heating unit is arranged between a liquid phase channel of the LNG storage tank and the buffer container; the buffer container is respectively connected with the ANG storage tank and the dual-fuel engine, and the ANG storage tank is connected with the dual-fuel engine. The BOG generated by the LNG storage tank due to heat leakage, shaking and the like is adsorbed and stored, the BOG is recycled, the pressure of the LNG storage tank is reduced, the BOG management problem troubling LNG application is solved, and a system device is simple and reliable; the ANG can adsorb BOG at any time and can supply gas to the dual-fuel engine at any time, so that the safety, economical efficiency and environmental friendliness of LNG use are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of BOG adsorption storage and management system of LNG automobile or small-sized dual-fuel ship. BACKGROUND

[0002] LNG is globally recognized clean energy, and it is also important alternative fuel for our country to implement "oil to gas" measure to small and medium-sized ships along coast and inland river. A small amount of heat is transmitted into the tank under the condition that the heat insulation measure of LNG storage tank is good, and the mechanical energy of ship in the process of sailing will eventually be converted into heat energy, which will cause LNG storage tank to produce BOG (Boil Off Gas) at evaporation rate of about 0.15% per day.

[0003] With the increasing of BOG, the pressure in LNG storage tank will continue to rise, and it must be discharged when it exceeds the set pressure of safety valve, otherwise it will threaten the safety of LNG storage tank. Direct discharge of BOG will exacerbate greenhouse effect and cause waste, and burning BOG also reduces the economy of the system, and using BOG adsorption storage can reduce the pressure of LNG storage tank, recycle and reuse, and improve the safety, economy and environmental protection of the system. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of BOG adsorption storage and management system of LNG automobile or small-sized dual-fuel ship to solve the management problem of BOG produced by LNG storage tank of LNG automobile or small-sized dual-fuel ship.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the technical scheme: a kind of BOG adsorption storage and management system of LNG automobile or small-sized dual-fuel ship, including LNG storage tank, buffer container, ANG storage tank, dual-fuel engine, LNG vaporization heating unit, the gas phase passage of LNG storage tank is connected with ANG storage tank and buffer container respectively, and the liquid phase passage of LNG storage tank is connected with buffer container;The LNG vaporization heating unit is arranged between the liquid phase passage of LNG storage tank and buffer container;The buffer container is connected with ANG storage tank and dual-fuel engine respectively, and the ANG storage tank is connected with dual-fuel engine.

[0006] Further, a heat exchanger is arranged between the ANG storage tank and the dual-fuel engine, and the cylinder sleeve cooling water of the dual-fuel engine flows into the heat exchanger to provide desorption heat for gas desorption in the ANG storage tank.

[0007] Further, the gas phase channel of the LNG storage tank is connected with a first low-temperature pump, the other end of the first low-temperature pump is connected with a electromagnetic stop valve A, one way of the electromagnetic stop valve A is connected with an ANG storage tank, and the other way of the electromagnetic stop valve A is connected with a buffer container through an electromagnetic stop valve C.

[0008] Further, the liquid phase channel of the LNG storage tank is connected with a second low-temperature pump, the other end of the second low-temperature pump is connected with an LNG vaporization heating unit through an electromagnetic stop valve D, and the LNG vaporization heating unit is connected with the buffer container through an electromagnetic stop valve E.

[0009] Further, the buffer container is connected with the ANG storage tank through an electromagnetic stop valve F, and the buffer container is connected with a dual-fuel engine through an electromagnetic stop valve G.

[0010] Further, the LNG vaporization heating unit comprises an LNG vaporizer, an LNG heater and a water-glycol heater connected in sequence.

[0011] Further, the LNG storage tank is arranged with two circulating loops, one of which is located between the LNG vaporizer and the LNG storage tank, and the other of which is located between the other side of the LNG vaporizer and the LNG storage tank.

[0012] Further, the LNG storage tank is self-pressurized.

[0013] Further, a pressurizing heater is further included, which uses the water-glycol solution in the water-glycol heater to heat the LNG.

[0014] Further, a nitrogen tank is further included, which is used as an external gas source of the LNG storage tank and pressurizes the LNG storage tank.

[0015] Compared with the prior art, the LNG storage tank of the utility model has the following effects: the BOG generated by the LNG storage tank due to heat leakage, shaking and the like is adsorbed and stored, the BOG is recycled, the pressure of the LNG storage tank is reduced, the BOG management problem that plagues the LNG application is solved, the system device is simple and reliable, the ANG can adsorb the BOG at any time and can supply gas to the dual-fuel engine at any time, and the safety, economy and environmental protection of the LNG use are improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a principle schematic view of the embodiment of the utility model;

[0017] Figure 2 is Figure 1 the Aspen-Hysys model diagram of corresponding pump pressurization;

[0018] Figure 3 is Figure 1 Corresponding self-boosted Aspen-Hysys model diagram;

[0019] Figure 4 is Figure 1 Corresponding external air source boosted Aspen-Hysys model diagram.

[0020] Figure 1 In the figure: 11-LNG storage tank; 12-first cryogenic pump; 13-electromagnetic stop valve A; 14-electromagnetic stop valve B; 15-electromagnetic stop valve C; 16-electromagnetic stop valve F; 17-ANG storage tank; 18-heat exchanger; 19-dual-fuel engine; 110-electromagnetic stop valve G; 111-buffer container; 112-electromagnetic stop valve E; 113-LNG vaporization heating unit; 114-electromagnetic stop valve D; 115-second cryogenic pump;

[0021] Figure 2 In the figure: 21-LNG storage tank; 23, 25, 26, 27, 29, 210, 215-electromagnetic stop valve; 212-GVU electromagnetic stop valve; 24-LNG vaporizer; 28-heat exchanger; 211-LNG heater; 213-buffer tank; 214-ANG storage tank; 22, 216-cryogenic pump;

[0022] Figure 3 In the figure: 31-LNG storage tank, 32-boosting heater; 33, 37, 311, 312-electromagnetic stop valve; 34-LNG vaporizer; 35-LNG heater; 36-water-glycol heater; 38-GVU electromagnetic stop valve; 39-buffer tank; 310-ANG storage tank;

[0023] Figure 4 In the figure: 41-LNG storage tank; 42-gas tank; 43, 45, 48, 412, 413-electromagnetic stop valve; 44-LNG vaporizer; 46-LNG heater; 47-water-glycol heater; 49-buffer tank; 410-GVU electromagnetic stop valve; 411-ANG storage tank. DETAILED DESCRIPTION

[0024] The utility model will be made further detailed explanation in combination with the drawings and specific implementation.

[0025] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] Example 1: As Figure 1 As shown, this utility model discloses an adsorption, storage, and management system for BOG (Boiled Air Gathering) from LNG vehicles or small dual-fuel vessels. It aims to solve the management problem of BOG generated by LNG storage tanks in LNG vehicles or small dual-fuel vessels. Specifically, it includes an LNG storage tank 11, a buffer container 111, an ANG storage tank 17 filled with a high-performance adsorbent, a dual-fuel engine 19, and an LNG vaporization heating unit 113. The gas phase channel of the LNG storage tank 11 is connected to the ANG storage tank 17 and the buffer container 111, respectively, and the liquid phase channel of the LNG storage tank 11 is connected to the buffer container 111. The LNG vaporization heating unit 113 is located between the liquid phase channel of the LNG storage tank 11 and the buffer container 111. The buffer container 111 is connected to the ANG storage tank 17 and the dual-fuel engine 19, respectively, and the ANG storage tank 17 is connected to the dual-fuel engine 19.

[0027] In this embodiment, a heat exchanger 18 is provided between the ANG storage tank 17 and the dual-fuel engine 19, and the cylinder liner cooling water of the dual-fuel engine 19 flows into the heat exchanger 18. Specifically, the heat exchanger 18 is arranged in the ANG storage tank 17, in which cylinder liner cooling water from the dual-fuel engine 19 flows, which can provide desorption heat for gas desorption in the ANG storage tank 17.

[0028] In this embodiment, the gas phase channel of the LNG storage tank 11 is connected to a first cryogenic pump 12, and the other end of the first cryogenic pump 12 is connected to an electromagnetic shut-off valve A13. One path of the electromagnetic shut-off valve A13 is connected to an electromagnetic shut-off valve B14, and then to the ANG storage tank 17; the other path of the electromagnetic shut-off valve A13 is connected to an electromagnetic shut-off valve C15, and then to the buffer container 111.

[0029] In this embodiment, the liquid phase channel of the LNG storage tank 11 is connected to a second cryogenic pump 115, and the pipeline between the other end of the second cryogenic pump 115 and the LNG vaporization heating unit 113 is connected to an electromagnetic shut-off valve D114. The pipeline between the LNG vaporization heating unit 113 and the buffer container 111 is connected to an electromagnetic shut-off valve E112.

[0030] In this embodiment, the pipeline between the buffer container 111 and the ANG storage tank 17 is provided with an electromagnetic stop valve F16, and the pipeline between the buffer container 111 and the dual-fuel engine 19 is provided with an electromagnetic stop valve G110 (GVU electromagnetic stop valve).

[0031] In this embodiment, the electromagnetic stop valve A, the electromagnetic stop valve B, the electromagnetic stop valve C, the electromagnetic stop valve D, the electromagnetic stop valve E, the electromagnetic stop valve F, and the electromagnetic stop valve G are controlled by the control module of the system.

[0032] In this embodiment, the working process includes the following steps:

[0033] (1) When the pressure value in the LNG storage tank 11 exceeds the first set value (1.6 MPa), the control module opens the electromagnetic stop valve A13, the electromagnetic stop valve B14, and the first low-temperature pump 12, and the BOG gas enters the ANG storage tank 17 for adsorption storage through the gas phase channel. When the pressure value in the LNG storage tank 11 is lower than the second set value, the control module closes the electromagnetic stop valve A13, the electromagnetic stop valve B14, and the first low-temperature pump 12, and the BOG gas stops entering the ANG storage tank 17;

[0034] (2) By opening the electromagnetic stop valve A13, the electromagnetic stop valve C15, and the first low-temperature pump 12 through the control module, the BOG gas in the LNG storage tank 11 can enter the buffer container 111;

[0035] (3) When the ANG storage tank 17 is full of BOG, the control module opens the electromagnetic stop valve F16, and the ANG storage tank 17 releases gaseous LNG into the buffer container 111;

[0036] (4) When the ANG storage tank 17 is empty, the control module opens the electromagnetic stop valve F16, and the gaseous LNG in the buffer container 111 enters the ANG storage tank 17 for adsorption storage;

[0037] (5) When the dual-fuel engine is working, the control module opens the electromagnetic stop valve D114, the electromagnetic stop valve E112, the second low-temperature pump 115, and the LNG vaporization heating unit 113 between the LNG storage tank 11 and the buffer container 111, and the liquid-phase LNG enters the liquid-phase channel, becomes gaseous LNG after passing through the vaporization heating unit 113, and then enters the buffer container 111. The buffer container 111 maintains a pressure of the third set value, and the control module opens the electromagnetic stop valve G110 to stabilize the pressure and output gaseous LNG into the dual-fuel engine 19.

[0038] Preferably, the pressure first set value (1.6 MPa) is greater than the pressure second set value, and the pressure third set value is greater than the standard intake pressure value of the dual-fuel engine 19.

[0039] The system adsorbs and stores BOG generated by LNG storage tank due to heat leakage, shaking and other reasons, recycles and utilizes the BOG, reduces the pressure of the LNG storage tank, solves the BOG management problem that has plagued LNG application, and the system device is simple and reliable. The ANG uses high-performance adsorbent to adsorb and store excess BOG, and can have considerable adsorption capacity at low pressure, saving investment cost and avoiding direct emission of BOG to pollute the atmosphere. The ANG can adsorb BOG at any time, and can supply gas to the dual-fuel engine at any time, improving the safety, economy and environmental protection of LNG use, and having broad application prospect and market value. It is very suitable for LNG vehicles or small and medium-sized "oil-to-gas" ships with limited cost budget.

[0040] Embodiment two: as shown in Figure 2 , the LNG vaporization and heating unit of the LNG storage tank is arranged in the LNG vaporization and heating unit of the LNG storage tank of embodiment one, and the LNG vaporization and heating unit of the LNG storage tank is arranged in the LNG vaporization and heating unit of the LNG storage tank of embodiment one. Figure 2 Figure 1 The corresponding Aspen-Hysys model diagram, this embodiment is based on the specific structure of the LNG vaporization and heating unit in embodiment one, specifically: the LNG vaporization and heating unit includes LNG vaporizer, LNG heater and heat exchanger connected in sequence, the liquid phase passage of LNG storage tank 21 first passes through the LNG vaporizer, and then passes through the LNG heater, and the heating medium in the LNG heater is water-glycol solution; the water-glycol solution in the heat exchanger 28 is heated by using cylinder jacket cooling water.

[0041] In this embodiment, the LNG storage tank is arranged with two circulating loops, one of which is located between the LNG vaporizer and the LNG storage tank, and the other of which is located between the LNG vaporizer and the LNG storage tank.

[0042] Embodiment three: as shown in Figure 3 , the difference between this embodiment and embodiment two is that the low-temperature pump is cancelled, the LNG storage tank is self-pressurized, and a booster heater is arranged, the booster heater uses water-glycol solution in the water-glycol heater to heat LNG, and the rest of the equipment pipeline arrangement is the same as Figure 2 .

[0043] Embodiment four: as shown in Figure 4 , the difference between this embodiment and embodiment two is that the low-temperature pump is cancelled, the LNG storage tank is pressurized by an external gas source, and a nitrogen tank is added, the nitrogen tank is used as an external gas source of the LNG storage tank and pressurizes the LNG storage tank, and the rest of the equipment pipeline arrangement is the same as Figure 2 .

[0044] ​Wherein, LNG (Liquefied Natural Gas) is liquefied natural gas; BOG (Boil Off Gas) refers to gas generated by evaporation of LNG due to absorption of environmental heat or shaking; and ANG (Absorbed Natural Gas) is an absorbed natural gas technology.

[0045] The utility model has the advantages of:

[0046] 1. For the problem of pressure rise caused by the continuous generation of BOG in the LNG tank of the LNG automobile or the small dual-fuel ship, the utility model adopts the ANG tank filled with high-performance adsorbent to adsorb and store BOG, thereby reducing the pressure in the LNG tank and maintaining it within the normal and safe set range, improving the safety of the system.

[0047] 2. The utility model uses ANG to adsorb and store BOG, and can release BOG to provide fuel for the dual-fuel engine at any time according to the needs of the dual-fuel engine, realizes the reuse of BOG, and improves the economy of the system.

[0048] 3. The utility model uses ANG to adsorb and store BOG, avoids the previous situation of directly discharging BOG generated by the LNG tank to the atmosphere, thereby reducing the emission of greenhouse gases and improving the environmental protection of the system.

[0049] 4. The three pressurization modes of pump pressurization, self-pressurization and external air source can meet different application scenarios.

[0050] If the utility model discloses or involves mutually fixed and connected parts or structural members, except for another declaration, the fixed connection can be understood as: detachable fixed connection (for example, bolt or screw connection), and can also be understood as: non-detachable fixed connection (for example, riveting, welding), of course, the mutually fixed connection can also be replaced by an integral structure (for example, integrally formed by using casting process) (except for obviously unable to use integral forming process).

[0051] In addition, the terms used to represent the position relationship or shape in any of the above-mentioned utility model disclosed technical solutions include states or shapes similar, similar or close to them, except for another declaration.

[0052] Any component provided by the utility model can be assembled from multiple individual components, or can be a single component manufactured by integral forming process.

[0053] It should be noted that the above examples are used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the specific embodiments of the present application can be modified or some technical features can be replaced by equivalent ones; without departing from the spirit of the technical solutions of the present application, they should be covered in the technical solution range of the present application claimed.

Claims

1. A system for the adsorptive storage and management of BOG for LNG vehicles or small dual-fuel vessels, characterized in that: The LNG storage tank, the buffer container, the ANG storage tank, the dual-fuel engine, and the LNG vaporization heating unit are connected with each other.

2. The system for adsorptive storage and management of BOG of an LNG vehicle or small dual-fuel vessel according to claim 1, characterized in that: A heat exchanger is arranged between the ANG storage tank and the dual-fuel engine, and the cylinder jacket cooling water of the dual-fuel engine flows into the heat exchanger to provide desorption heat for gas desorption in the ANG storage tank.

3. The system for adsorptive storage and management of BOG of an LNG vehicle or small dual-fuel vessel according to claim 1, characterized in that: The gas phase passage of the LNG storage tank is connected with a first low-temperature pump, the other end of the first low-temperature pump is connected with a solenoid stop valve A, one way of the solenoid stop valve A is connected with a solenoid stop valve B arranged between the ANG storage tank, and the other way of the solenoid stop valve A is connected with a solenoid stop valve C arranged between the buffer container.

4. The system for adsorptive storage and management of BOG of an LNG vehicle or small dual-fuel vessel according to claim 1, characterized in that: The liquid phase passage of the LNG storage tank is connected with a second low-temperature pump, the other end of the second low-temperature pump is connected with a solenoid stop valve D arranged between the LNG vaporization heating unit, and the LNG vaporization heating unit is connected with a solenoid stop valve E arranged between the buffer container.

5. The system for adsorptive storage and management of BOG of an LNG vehicle or small dual-fuel vessel according to claim 1, characterized in that: The buffer container is connected with a solenoid stop valve F arranged between the ANG storage tank, and the buffer container is connected with a solenoid stop valve G arranged between the dual-fuel engine.

6. The system of claim 1, wherein: The LNG vaporization heating unit comprises an LNG vaporizer, an LNG heater, and a water-glycol heater connected in sequence.

7. A system for the adsorptive storage and management of BOG for an LNG vehicle or small dual-fuel vessel according to claim 6, characterized in that: The LNG storage tank is arranged with two circulating loops, one of which is arranged between the LNG vaporizer and the LNG storage tank, and the other of which is arranged between the other side of the LNG vaporizer and the LNG storage tank.

8. The system of claim 1, wherein: The LNG storage tank is self-pressurized.

9. The system of claim 6, wherein: A booster heater is further arranged, which uses the water-glycol solution in the water-glycol heater to heat the LNG.

10. The system of claim 1, wherein: A nitrogen tank is further arranged, which is used as an external gas source of the LNG storage tank and pressurizes the LNG storage tank.

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