WO2023011282A1 - C型液化气舱压力控制系统 - Google Patents

C型液化气舱压力控制系统 Download PDF

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Publication number
WO2023011282A1
WO2023011282A1 PCT/CN2022/108206 CN2022108206W WO2023011282A1 WO 2023011282 A1 WO2023011282 A1 WO 2023011282A1 CN 2022108206 W CN2022108206 W CN 2022108206W WO 2023011282 A1 WO2023011282 A1 WO 2023011282A1
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WO
WIPO (PCT)
Prior art keywords
pressure
pressure relief
valve
liquefied gas
gas tank
Prior art date
Application number
PCT/CN2022/108206
Other languages
English (en)
French (fr)
Inventor
许峰
李晓峰
周玮
朱越星
孙兴利
任淑霞
刘昊天
Original Assignee
上海船舶研究设计院（中国船舶工业集团公司第六0四研究院）
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Application filed by 上海船舶研究设计院（中国船舶工业集团公司第六0四研究院） filed Critical 上海船舶研究设计院（中国船舶工业集团公司第六0四研究院）
Publication of WO2023011282A1 publication Critical patent/WO2023011282A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
    • F17C5/02—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with liquefied gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/04—Arrangement or mounting of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • F17C2205/0332—Safety valves or pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/06—Controlling or regulating of parameters as output values
    • F17C2250/0605—Parameters
    • F17C2250/0626—Pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/06—Controlling or regulating of parameters as output values
    • F17C2250/0689—Methods for controlling or regulating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/02—Improving properties related to fluid or fluid transfer

Definitions

  • the present application relates to the technical field of oil and gas storage and transportation, in particular to a C-type liquefied gas tank pressure control system.
  • C-type liquefied gas storage tanks as a main pressure tank storage type of natural gas, are being used in more and more usage scenarios.
  • the volume of the C-type tank directly depends on the needs of the user. When the user's demand, pressure setting and tank filling rate are certain, the size of the C-type tank itself is also determined.
  • the ventilation pressure of the mainstream C-type tank is usually set at 4 to 4.5 bar, so the corresponding LNG (density about 0.44t/m 3 ) filling rate is usually about 90%, and the use efficiency of the C-type tank
  • LNG density about 0.44t/m 3
  • the filling rate setting is single, and users cannot choose according to their own usage.
  • the problem to be solved in this application is: to increase the filling rate of the C-type liquefied gas tank, and users can choose flexibly according to their own needs.
  • a type C liquefied gas tank pressure control system provided by the present application includes: a pressure relief assembly; the pressure relief assembly is connected to the type C liquefied gas tank, and the pressure relief assembly is used to control the The pressure in the cabin is lower than the design pressure of the C-type liquefied gas tank, and the pressure relief pressure value of the pressure relief assembly can be adjusted according to working conditions.
  • the pressure relief assembly includes at least two first pressure relief valves connected to the C-type liquefied gas tank, all of the first pressure relief valves are connected in parallel, and the relief valves of all the first pressure relief valves The pressure value changes gradually from small to large; the first pressure relief valve is used to control the pressure in the Type C liquefied gas tank to be lower than the design pressure of the Type C liquefied gas tank.
  • the pressure relief assembly also includes at least two first pre-valves, one end of the first pre-valve is connected to the first pressure relief valve, and the other end is connected to the C-type liquefied gas tank;
  • the first pre-valve is used to control the on-off of the pressure relief assembly.
  • the first pressure release valve corresponds to the first pre-valve one by one.
  • the pressure relief assembly also includes at least two second pressure relief valves, the second pressure relief valves are backup valves for the first pressure relief valve; all of the second pressure relief valves and the C
  • the type liquefied gas tank is connected in parallel with the first pressure relief valve; the second pressure relief valve is set correspondingly to the first pressure relief valve.
  • the pressure relief assembly also includes at least two second pre-valves, one end of the second pre-valve is connected to the C-type liquefied gas tank, and the other end is connected to the second pressure relief valve;
  • the second pre-valve is used to control the on-off of the pressure relief assembly.
  • the second pressure release valve corresponds to the second pre-valve one by one.
  • the pressure relief assembly includes a first adjustable pressure relief valve connected to the C-type liquefied gas tank; the first adjustable pressure relief valve is used to control the The pressure in the Type C liquefied gas tank is lower than the design pressure of the Type C liquefied gas tank.
  • the pressure relief assembly also includes a third pre-valve, and along the flow direction of the medium in the C-type liquefied gas tank, the third pre-valve and the first adjustable pressure relief valve are arranged in sequence ;
  • the third pre-valve is used to control the on-off of the pressure relief assembly.
  • the pressure relief assembly also includes a second adjustable pressure relief valve and a fourth pre-valve
  • the second adjustable pressure relief valve is a backup valve for the first adjustable pressure relief valve, and along the The flow direction of the medium in the C-type liquefied gas tank, the fourth pre-valve and the second adjustable pressure relief valve are arranged in sequence; the fourth pre-valve is used to control the on-off of the pressure relief assembly .
  • the beneficial effects of the present application include: a C-type liquefied gas tank pressure control system provided by the present application, including: a C-type liquefied gas tank and a pressure relief assembly, the pressure relief assembly is connected to the C-type liquefied gas tank, and the The pressure relief component is used to control the pressure in the Type C liquefied gas tank to be lower than the design pressure of the Type C liquefied gas tank, and the pressure relief pressure value of the pressure relief component can be adjusted according to working conditions.
  • the pressure of the pressure relief component is adjustable, so the filling rate of the C-type liquefied gas tank can be adjusted according to the pressure relief set by the pressure relief component.
  • Pressure adjustment when the liquefied gas is expected to be consumed quickly, the pressure relief pressure of the pressure relief component can be reduced, thereby increasing the filling rate of the C-type liquefied gas tank, reducing the holding time, and by filling more
  • the pressure relief pressure of the pressure relief component can be increased, the holding time can be increased, and the filling rate can be reduced. At this time, fuel waste can be avoided.
  • Fig. 1 is a schematic diagram of a C-type liquefied gas tank pressure control system provided by the embodiment of the present application;
  • FIG. 2 is a schematic diagram of another C-type liquefied gas tank pressure control system provided by the embodiment of the present application.
  • Fig. 3 is a graph of the relationship between the relative density of LNG and the filling rate when the pressure relief pressure is 4.4 bar provided by the embodiment of the present application;
  • Fig. 4 is a diagram of the relationship between the relative density of LNG and the filling rate when the pressure relief pressure is 0.7 bar provided by the embodiment of the present application;
  • Fig. 5 is the pressure and temperature change curve in the C-type liquefied gas tank provided by the embodiment of the present application and the density and temperature change curve of LNG;
  • Fig. 6 is a schematic diagram of a type C liquefied gas tank actual pressure control system provided by the embodiment of the present application.
  • Icon Type 1-C liquefied gas tank
  • connection and “installation” should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or a Connected through an intermediary; either mechanical or electrical.
  • connection and “installation” should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or a Connected through an intermediary; either mechanical or electrical.
  • an embodiment of the present application provides a C-type liquefied gas tank pressure control system, including: a pressure relief component connected to a C-type liquefied gas tank 1, the pressure relief component The pressure component is used to control the pressure in the C-type liquefied gas tank 1 to be lower than the design pressure of the C-type liquefied gas tank 1, and the pressure relief pressure value of the pressure relief component can be adjusted according to working conditions.
  • the pressure relief component is the safety protection system of the C-type liquefied gas tank 1, and is used to increase the medium pressure in the C-type liquefied gas tank 1
  • the pressure in the type C liquefied gas chamber 1 is reduced by discharging the medium to the outside of the type C liquefied gas chamber 1, thereby preventing the Type C liquefied gas tank 1 had an accident due to excessive pressure.
  • liquefied natural gas is taken as an example.
  • the initial general temperature in the tank is -163°C. Due to heat conduction, external heat will continuously enter into the C-type liquefied gas tank 1, the temperature in the C-type liquefied gas tank 1 will increase, and the temperature of the LNG will also increase accordingly. At the same time, the density will decrease and the volume will increase.
  • the LNG It starts to volatilize into a gaseous state, and the air pressure on the top of the cabin rises.
  • the valve of the pressure relief component opens to discharge the volatilized gas into the C-type liquefied gas Cabin 1 outside.
  • Figure 3 is a relationship diagram between LNG density and filling rate when the pressure relief pressure of the pressure relief assembly is 4 bar, it can be deduced that as the LNG density decreases, Its fill rate is increased.
  • curve 2 is a relationship curve between pressure and temperature.
  • the pressure in the C-type liquefied gas tank 1 increases.
  • curve 1 is a relationship curve between the density of LNG and temperature. When the temperature rises, the density of LNG decreases due to volatilization of LNG.
  • the filling rate of LNG in the C-type liquefied gas tank 1 can be changed by providing a pressure relief assembly that can adjust the pressure relief pressure.
  • the LNG in the C-type liquefied gas tank 1 is consumed quickly, and a lower pressure relief pressure value can be set for the pressure relief component to increase the filling rate of the liquefied gas tank and fill more LNG fuel.
  • the pressure relief pressure value can also be gradually increased according to the remaining amount of LNG in the C-type liquefied gas tank 1 (but it must be ensured that the proportion of the remaining LNG does not exceed the filling level corresponding to the higher pressure relief pressure. Rate), to increase the storage time of LNG in the cabin, to avoid accidental waste of LNG fuel.
  • the higher pressure release pressure value described here is lower than the design pressure of the Type C liquefied gas tank 1 to prevent accidents due to excessive pressure in the Type C liquefied gas tank 1 .
  • the outer wall of the C-type liquefied gas cabin 1 can be made of heat-insulating material, or a vacuum double-layer wall can be set on the side wall of the C-type liquefied gas cabin 1, so as to achieve the purpose of slowing down the heat conduction, and then by setting a lower To achieve the purpose of providing filling rate.
  • the pressure relief component can adjust the pressure relief pressure value according to the actual practical situation, and then adjust the filling rate of LNG in the C-type liquefied gas tank 1 .
  • the pressure relief assembly includes at least two first pressure relief valves 21 connected to the C-type liquefied gas tank 1, all the first pressure relief valves 21 are connected in parallel, and all the first pressure relief valves 21 are connected in parallel.
  • a pressure release valve 21 has different release pressure values, and the first pressure release valve 21 is used to control the pressure in the Type C liquefied gas tank 1 to be lower than the design pressure of the Type C liquefied gas tank 1 .
  • the pressure relief assembly is provided with two or more first pressure release valves 21 with different relief pressure values to achieve the purpose of changing the filling rate.
  • the first pressure release valve 21 with a lower pressure release pressure value can be used.
  • the first pressure release valve 21 with a higher pressure release pressure value can be used.
  • the valves 21 are connected in parallel so that the first pressure relief valves 21 do not affect each other when they work.
  • the first pressure relief valves 21 The maximum pressure relief pressure value must be less than the design pressure of the C-type liquefied gas tank 1.
  • the pressure relief assembly also includes at least two first pre-valve 22, one end of the first pre-valve 22 is connected to the first pressure relief valve 21, and the other end is connected to the C-type
  • the liquefied gas tank 1 is connected, and the first pre-valve 22 is used to control the on-off of the pressure relief assembly.
  • the first pre-valve 22 is arranged between the C-type liquefied gas tank 1 and the first pressure relief valve 21, when a first pressure with a higher relief pressure value is required
  • the relief valve 21 When the relief valve 21 is working, close the first pre-valve 22 between the first pressure relief valve 21 with a lower relief pressure value and the C-type liquefied gas tank 1, so as to cut off the pipeline and make the relief pressure
  • the first pressure release valve 21 with a higher value works, and when the first pressure release valve 21 with a lower pressure release pressure needs to work, the operation method is the same, and will not be repeated here.
  • the function of the first pre-valve 22 is to cut off the pipeline, and the working pressure of the first pre-valve 22 cannot be lower than the pressure relief pressure of the first pre-valve 22.
  • the The first pre-valve 22 is a gate valve with a simple structure, which has strong applicability. Others, such as stop valves, can be used as long as they can control the on-off of the pressure relief component.
  • the first pressure release valve 21 corresponds to the first pre-valve 22 one by one. That is, one first pre-valve 22 may be provided between each first pressure relief valve 21 and the C-type liquefied gas tank 1 .
  • first pre-valve 22 may also be arranged between the first pressure relief valve 21 and the C-type liquefied gas tank 1 to prevent other first pre-valve 22 LNG leakage caused by failure to replace in time due to damage.
  • the pressure relief assembly also includes at least two second pressure relief valves 23, the second pressure relief valves 23 are backup valves for the first pressure relief valve 21, and the second pressure relief valves
  • the valve 23 is connected with the C-type liquefied gas tank 1 and connected in parallel with the first pressure relief valve 21 , and the second pressure relief valve 23 is set corresponding to the first pressure relief valve 21 .
  • the second pressure release valve 23 is used to work. It should be noted that, The quantity and relief pressure value of the second pressure relief valve 23 and the first pressure relief valve 21 need to be in one-to-one correspondence, and the second pressure relief valve 23 is connected in parallel, and the second pressure relief valve 23 is connected in parallel with the first pressure release valve 21 to achieve the purpose of backup.
  • the pressure relief assembly also includes at least two second pre-valve 24, one end of the second pre-valve 24 is connected to the C-type liquefied gas tank 1, and the other end is connected to the second The pressure relief valve 23 is connected, and the second pre-valve 24 is used to control the on-off of the pressure relief assembly.
  • the number of the second pre-valve 24 is the same as that of the second pressure release valve 23 and they are arranged correspondingly.
  • the function of the second pre-valve 24 is the same as that of the first pre-valve 22 , which will not be repeated here.
  • the pressure relief assembly can be provided with three first pressure relief valves 21 and three second pressure relief valves 23 to achieve a more comprehensive change of the C-type liquefied gas tank 1 filling rate.
  • the first pressure relief valve 21 and the second pressure relief valve 23 are connected in parallel, and the first pressure relief valve 21 and the second pressure relief valve 23 are set in one-to-one correspondence, that is, the quantity and pressure value corresponding settings.
  • the pressures of the three pressure relief valves can be increased sequentially, or can be selected according to the actual use conditions (use environment, etc.) of the C-type liquefied gas tank 1, as long as the maximum relief pressure value of the first relief valve is satisfied It only needs to be lower than the design pressure of the C-type liquefied gas tank 1 .
  • the pressure relief assembly includes a first adjustable pressure relief valve 31, the first adjustable pressure relief valve 31 is connected to the C-type liquefied gas tank 1, and the first adjustable pressure relief valve 31 is connected to the type C liquefied gas tank 1.
  • the valve 31 is used to control the pressure in the type C liquefied gas tank 1 to be lower than the design pressure of the type C liquefied gas tank 1 .
  • the first adjustable pressure relief valve 31 can be set arbitrarily within a certain range.
  • the pressure relief component needs to adjust the pressure relief value to achieve the purpose of changing the filling rate.
  • the purpose can be achieved by adjusting the pressure relief value of the first adjustable pressure relief valve 31 .
  • the pressure relief assembly also includes a third pre-valve 32, and along the flow direction of the medium in the C-type liquefied gas tank 1, the third pre-valve 32 and the first possible Pressure regulating release valves 31 are provided in sequence, and the third pre-valve 32 is used to control the on-off of the pressure relief assembly.
  • the third pre-valve 32 is used to control the on-off of the pressure relief component, and when the first adjustable pressure relief valve 31 is maintained or checked, the third pre-valve 32 is closed. Set the valve 32 to block the gas flow in the pipeline, and then remove the first adjustable pressure relief valve 31.
  • the structure and function of the third pre-valve 32 are the same as those of the first pre-valve 22 and the second pre-valve 24 in the first embodiment, and will not be repeated here.
  • the pressure relief assembly further includes a second adjustable pressure relief valve 33 and a fourth pre-valve 34
  • the second adjustable pressure relief valve 33 is the first adjustable pressure relief valve 31 and along the flow direction of the medium in the C-type liquefied gas tank 1, the fourth pre-valve 34 and the second adjustable pressure relief valve 33 are arranged in sequence, and the fourth pre-valve 34 It is used to control the on-off of the pressure relief assembly.
  • the second adjustable pressure relief valve 33 is a backup valve for the first adjustable pressure relief valve 31, which has the same function as the second pressure relief valve 23 in Embodiment 1, and is not mentioned here. Let me repeat. It should be noted that the first adjustable pressure relief valve 31 is connected in parallel with the second adjustable pressure relief valve 33 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

一种C型液化气舱压力控制系统，包括泄压组件，泄压组件与C型液化气舱（1）连接，泄压组件用于控制C型液化气舱（1）内压力小于C型液化气舱（1）的设计压力，同时泄压组件的泄压压力值可根据工况调节。该C型液化气舱压力控制系统通过调整泄压组件的泄压压力值，从而改变C型液化气舱的充装率，提高了C型液化气舱的实用灵活性。

Description

C型液化气舱压力控制系统
相关申请
本申请要求于2021年08月03日递交的申请号为202110884973.6的中国发明专利申请的优先权，并引用上述专利申请公开的内容作为本申请的一部分。
技术领域
本申请涉及油气储运技术领域，尤其是涉及一种C型液化气舱压力控制系统。
背景技术
随着清洁能源的推广，C型液化气储存舱作为天然气的一种主要的压力罐储存型式，正在用于越来越多的使用场景。C型舱的容积大小直接取决于用户的需求，在用户需求量、压力设置及罐子充装率一定的情况下，C型罐本身的大小也即确定。
现有技术中，主流C型舱的透气压力通常设置在4～4.5bar，由此对应的LNG(密度约0.44t/m 3)充装率通常在90％左右，在C型罐的使用效率上，仍有提高的空间，且充装率设置单一，用户无法根据自身使用情况进行选择。
发明内容
本申请所要解决的问题是：提升C型液化气舱的充装率，使用者根据自身需求可以灵活选择。
本申请提供的一种C型液化气舱压力控制系统，包括：泄压组件；所述泄压组件与所述C型液化气舱连接，所述泄压组件用于控制所述C型液化气舱内压力小于所述C型液化气舱的设计压力，同时所述泄压组件的泄压压力值可根据工况调节。
进一步的，所述泄压组件包括与所述C型液化气舱连接的至少两个第一压力释放阀，全部所述第一压力释放阀并联连接，且全部所述第一压力释放阀的泄压压力值由小至大呈梯度变化；所述第一压力释放阀用于控制所述C型液化气舱内压力小于所述C型液化气舱的设计压力。
进一步的，所述泄压组件还包括至少两个第一前置阀，所述第一前置阀一端与所述第一压力释放阀连接，另一端与所述C型液化气舱连接；所述第一前置阀用于控制所述泄压组件的通断。
进一步的，所述第一压力释放阀和所述第一前置阀一一对应。
进一步的，所述泄压组件还包括至少两个第二压力释放阀，所述第二压力释放阀为所述第一压力释放阀的备用阀；全部所述第二压力释放阀与所述C型液化气舱连接，且与所述第一压力释放阀并联；所述第二压力释放阀与所述第一压力释放阀对应设置。
进一步的，所述泄压组件还包括至少两个第二前置阀，所述第二前置阀一端与所述C型液化气舱连接，另一端与所述第二压力释放阀连接；所述第二前置阀用于控制所述泄压组件的通断。
进一步的，第二压力释放阀和所述第二前置阀一一对应。
进一步的，所述泄压组件包括第一可调压力释放阀，所述第一可调压力释放阀与所述C型液化气舱连接；所述第一可调压力释放阀用于控制所述C型液化气舱内压力小于所述C型液化气舱的设计压力。
进一步的，所述泄压组件还包括第三前置阀，且沿所述C型液化气舱内的介质流动方向，所述第三前置阀和所述第一可调压力释放阀依次设置；所述第三前置阀用于控制所述泄压组件的通断。
进一步的，所述泄压组件还包括第二可调压力释放阀和第四前置阀，所述第二可调压力释放阀为所述第一可调压力释放阀的备用阀，且沿所述C型液化气舱内的介质流动方向，所述第四前置阀和所述第二可调压力释放阀依次设置；所述第四前置阀用于控制所述泄压组件的通断。
本申请的有益效果包括：本申请提供的一种C型液化气舱压力控制系统，包括：C型液化气舱和泄压组件，所述泄压组件与所述C型液化气舱连接，所述泄压组件用于控制所述C型液化气舱内压力小于所述C型液化气舱的设计压力，同时所述泄压组件的泄压压力值可根据工况调节。
由于所述C型液化气舱的充装率与泄压压力有关，所述泄压组件的压力可调，因此，所述C型液化气舱的充装率可根据泄压组件设定的泄压压力调整，当预期液化气消耗较快时，可降低所述泄压组件的泄压压力，由此可以提升所述C型液化气舱的充装率，减少憋气时间，通过充装更多的液化气而到达续航长久的目的；当预期的液化气消耗较慢时，可以提高所述泄压组件的泄压压力，提高憋气时间，降低充装率，此时可以避免燃料的浪费。通过调整泄压压力来改变所述C型液化气舱的充装率和憋气时间，用户可以根据自身需求选择合适的泄压压力，提高了C型液化气舱的实用灵活性，极大提高了用户的体验感。
附图说明
为了更清楚地说明本申请具体实施方式或现有技术中的技术方案，下面将对具体实施方式或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图是本申请的一些实施方式，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本申请实施例提供的一种C型液化气舱压力控制系统示意图；
图2为本申请实施例提供的另一种C型液化气舱压力控制系统示意图；
图3为本申请实施例提供的泄压压力为4.4bar时LNG相对密度与充装率变化关系图；
图4为本申请实施例提供的泄压压力为0.7bar时LNG相对密度与充装率变化关系图；
图5为本申请实施例提供的C型液化气舱内压力与温度变化曲线和LNG的密度与温度变化曲线；
图6为本申请实施例提供的一种C型液化气舱实际使用压力控制系统示意图。
图标：1-C型液化气舱；
21-第一压力释放阀；22-第一前置阀；23-第二压力释放阀；24-第二前置阀；
31-第一可调压力释放阀；32-第三前置阀；33-第二可调压力释放阀；34-第四前置阀。
具体实施方式
下面将结合实施例对本申请的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
需要说明的是，在本申请的描述中，术语“中心”、“上”、“下”、“左”、“右”、“竖直”、“水平”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性。
需要说明的是，在本申请的描述中，术语“连接”和“安装”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体连接；可以是直接相连，也可以通过中间媒介相连；可以是机械连接，也可以是电连接。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请中的具体含义。
如图1至图2所示，本申请一个实施例提供了一种C型液化气舱压力控制系统，包括：泄压组件，所述泄压组件与C型液化气舱1连接，所述泄压组件用于控制所述C型液化气舱 1内压力小于所述C型液化气舱1的设计压力，同时所述泄压组件的泄压压力值可根据工况调节。
本实施例提供的C型液化气舱压力控制系统，所述泄压组件为所述C型液化气舱1的安全保护系统，用于在所述C型液化气舱1内的介质压力升高至超过规定值，及所述泄压组件设定的泄压压力值时，通过向所述C型液化气舱1外排放介质降低所述C型液化气舱1内的压力，进而防止所述C型液化气舱1因压力过高而发生事故。
本实施例中，以液化天然气(LNG)为例，当LNG注入所述C型液化气舱1内后，舱内的初始一般温度为-163℃。由于热传导，外界热量会不断进入至所述C型液化气舱1内，C型液化气舱1内的温度会升高，LNG温度也随之升高，同时密度下降，体积增大，同时LNG开始挥发成为气态，舱顶的气压升高，当舱顶的压力升高至所述泄压组件设定的泄压值时，泄压组件的阀门打开，将挥发的气体排放到C型液化气舱1外。
如图3所示，根据本申请提供的一个实施例，图3为所述泄压组件的泄压压力为4bar时，LNG密度与充装率的关系图，可以推出，随着LNG密度降低，其充装率增加。
如图5所示，根据本申请提供的一个实施例，曲线二为压力与温度关系曲线，当温度升高时，所述C型液化气舱1内的压力增加。
如图5所示，根据本申请提供的一个实施例，曲线一为LNG的密度与温度关系曲线，当温度升高时，由于LNG的挥发，导致LNG的密度降低。
如图3和图5所示，可以得出，当降低所述泄压组件设定的泄压压力值，所述C型液化气舱1内挥发的气体会在较低压力时排出所述C型液化气舱1外，而C型液化气舱1内的温度由于与外界热传导，C型液化气舱1内的温度不断升高，进而导致LNG挥发加快，此时所述C型液化气舱1内LNG密度较低，较低的密度对应的充装率较高，因此，通过降低泄压组件的泄压压力值，可以提高LNG的充装率。
如图4所示，根据本申请提供的另一个实施例，当所述泄压组件的泄压压力值设为0.7bar时，对应的充装率与密度关系曲线，由此可以得出结论，当所述泄压组件的泄压压力值设定较低时，所述C型液化气舱1内LNG的充装率会提高。
因此，通过设置可调节泄压压力的泄压组件，可以改变所述C型液化气舱1内LNG的充装率。
根据本申请提供的一个实施例，以使用C型液化气舱1作为LNG燃料储存舱的船舶为例，当船舶加注LNG燃料时，如果在加注LNG燃料后即要使用LNG作为燃料航行，此时所述C型液化气舱1内的LNG消耗较快，可以通过对泄压组件设定较低的泄压压力值，以提升液化气舱的充装率，充装更多的LNG燃料，提高续航力；如果在所述C型液化气舱1 内加注LNG燃料后，船舶可能待港或候潮，LNG的消耗速度较慢，则对泄压组件设定较高的泄压压力值，尽管充装率会降低，但会降低LNG的损耗，有利于长期储存。即，在加注燃料时，可以按照预期的船舶使用状态，进行最有利的调整；若LNG在短时间内有较大的消耗时，采用较低的泄压压力值，可以提高所述LNG的充装率，装载更多的LNG；当需要长时间储存时，可以设定较高的泄压压力值，以达到长期储存的目的。此外，在船舶航行的中间阶段，也可以根据C型液化气舱1内LNG的剩余量，逐步调高泄压压力值(但需确保剩余LNG的比例不超过较高泄压压力对应的充装率)，来增加LNG在舱内的保存时间，避免意外浪费LNG燃料。需要注意的是，此处描述较高的泄压压力值小于所述C型液化气舱1的设计压力，以防C型液化气舱1内压力过高而发生事故。
可以理解的是，所述C型液化气舱1外壁可以采用隔温材料，或在C型液化气舱1侧壁设置真空双层仓壁，进而达到减缓热传导的目的，再通过设定较低的泄压压力值以达到提供充装率的目的。
根据本申请的一个实施例，所述泄压组件可根据实际实用情况调节泄压压力值，进而调节所述C型液化气舱1内LNG的充装率。
实施例一
如图1所示，所述泄压组件包括与所述C型液化气舱1连接的至少两个第一压力释放阀21，所有所述第一压力释放阀21并联连接，且所有所述第一压力释放阀21的释压压力值不同，所述第一压力释放阀21用于控制所述C型液化气舱1内压力小于所述C型液化气舱1的设计压力。
根据本申请的一个实施例，所述泄压组件通过设置两个或两个以上，并且泄压压力值不等的第一压力释放阀21，以达到改变充装率的目的，当需要较高的充装率时，可以采用泄压压力值较低的第一压力释放阀21，当需要长期储存时，可以采用泄压压力值较高的第一压力释放阀21，所述第一压力释放阀21采用并联的连接方式，以使各第一压力释放阀21之间工作时不互相影响，同时，为避免所述C型液化气舱1损坏及造成安全事故，所述第一压力释放阀21最高泄压压力值需小于所述C型液化气舱1的设计压力。
如图1所示，所述泄压组件还包括至少两个第一前置阀22，所述第一前置阀22一端与所述第一压力释放阀21连接，另一端与所述C型液化气舱1连接，所述第一前置阀22用于控制所述泄压组件的通断。
根据本申请的一个实施例，所述第一前置阀22设于所述C型液化气舱1与所述第一压力释放阀21之间，当需要泄压压力值较高的第一压力释放阀21工作时，关闭泄压压力值较低的第一压力释放阀21与所述C型液化气舱1之间的第一前置阀22，以切断管路，使所述 泄压压力值较高的第一压力释放阀21工作，当需要泄压压力值较低的第一压力释放阀21工作时，操作方式相同，此处不再赘述。
可以理解的是，所述第一前置阀22的作用为切断管路，同时第一前置阀22的工作压力不能低于所述第一前置阀22的泄压压力，优选的，所述第一前置阀22选用结构简单的闸阀，适用性强，其它如截止阀的，只要能达到控制所述泄压组件通断均可。
如图1所示，所述第一压力释放阀21和所述第一前置阀22一一对应。即每个第一压力释放阀21与所述C型液化气舱1之间设置一个所述第一前置阀22即可。
可以理解的是，所述第一压力释放阀21与所述C型液化气舱1之间也可以设置两个或两个以上的第一前置阀22，用于防止其他第一前置阀22由于损坏而不及时更换而造成的LNG泄露。
如图1所示，所述泄压组件还包括至少两个第二压力释放阀23，所述第二压力释放阀23为所述第一压力释放阀21的备用阀，所述第二压力释放阀23与所述C型液化气舱1连接，且与所述第一压力释放阀21并联，所述第二压力释放阀23与所述第一压力释放阀21对应设置。
根据本申请的一个实施例，由于泄压组件需要定期校验，即，当所述第一压力释放阀21损坏或校验时，采用所述第二压力释放阀23工作，需要说明的是，所述第二压力释放阀23与所述第一压力释放阀21的数量、泄压压力值均需一一对应，且所述第二压力释放阀23之间并联，所述第二压力释放阀23与所述第一压力释放阀21并联，以达到备用的目的。
如图1所示，所述泄压组件还包括至少两个第二前置阀24，所述第二前置阀24一端与所述C型液化气舱1连接，另一端与所述第二压力释放阀23连接，所述第二前置阀24用于控制所述泄压组件的通断。
根据本申请的一个实施例，所述第二前置阀24与所述第二压力释放阀23数量相同且对应设置。所述第二前置阀24与所述第一前置阀22功能相同，此处不再赘述。
在实际使用中，如图6所示，所述泄压组件可以通过设置三个第一压力释放阀21和三个第二压力释放阀23，以达到更加全面的改变所述C型液化气舱1充装率。所述第一压力释放阀21和所述第二压力释放阀23之间均为并联，所述第一压力释放阀21和所述第二压力释放阀23一一对应设置，即数量和压力值均对应设置。三个所述压力释放阀的压力可以依次递增，也可以根据所述C型液化气舱1的实际使用情况(使用环境等)进行选择，只需满足所述第一释放阀最高泄压压力值小于所述C型液化气舱1的设计压力即可。
实施例二
如图2所示，所述泄压组件包括第一可调压力释放阀31，所述第一可调压力释放阀31 与所述C型液化气舱1连接，所述第一可调压力释放阀31用于控制所述C型液化气舱1内压力小于所述C型液化气舱1的设计压力。
根据本申请的一个实施例，所述第一可调压力释放阀31可在一定范围内任意设置，在本实施例中，所述泄压组件需调节泄压压力值而达到改变充装率的目的，通过调节所述第一可调压力释放阀31的泄压值即可实现。
如图2所示，所述泄压组件还包括第三前置阀32，且沿所述C型液化气舱1内的介质流动方向，所述第三前置阀32和所述第一可调压力释放阀31依次设置，所述第三前置阀32用于控制所述泄压组件的通断。
根据本申请的一个实施例，所述第三前置阀32用于控制所述泄压组件通断，当所述第一可调压力释放阀31维修或校验时，关闭所述第三前置阀32，阻断管路中的气体流动，随后将所述第一可调压力释放阀31拆除。所述第三前置阀32结构、功能与实施例一中的第一前置阀22和第二前置阀24相同，此处不再赘述。
如图2所示，所述泄压组件还包括第二可调压力释放阀33和第四前置阀34，所述第二可调压力释放阀33为所述第一可调压力释放阀31的备用阀，且沿所述C型液化气舱1内的介质流动方向，所述第四前置阀34和所述第二可调压力释放阀33依次设置，所述第四前置阀34用于控制所述泄压组件的通断。
根据本申请的一个实施例，所述第二可调压力释放阀33为所述第一可调压力释放阀31的备用阀，与实施例一中第二压力释放阀23作用相同，此处不再赘述。需要注意的是，所述第一可调压力释放阀31与所述第二可调压力释放阀33并联。
最后应说明的是：以上各实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述各实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的范围。

Claims (10)

  1. 一种C型液化气舱压力控制系统，其中，包括：泄压组件；
    所述泄压组件与所述C型液化气舱(1)连接，所述泄压组件用于控制所述C型液化气舱(1)内压力小于所述C型液化气舱(1)的设计压力，同时所述泄压组件的泄压压力值可根据工况调节。
  2. 根据权利要求1所述的C型液化气舱压力控制系统，其中，所述泄压组件包括与所述C型液化气舱(1)连接的至少两个第一压力释放阀(21)，全部所述第一压力释放阀(21)并联连接，且全部所述第一压力释放阀(21)的泄压压力值由小至大呈梯度变化；
    所述第一压力释放阀(21)用于控制所述C型液化气舱(1)内压力小于所述C型液化气舱(1)的设计压力。
  3. 根据权利要求2所述的C型液化气舱压力控制系统，其中，所述泄压组件还包括至少两个第一前置阀(22)，所述第一前置阀(22)一端与所述第一压力释放阀(21)连接，另一端与所述C型液化气舱(1)连接；
    所述第一前置阀(22)用于控制所述泄压组件的通断。
  4. 根据权利要求3所述的C型液化气舱压力控制系统，其中，所述第一压力释放阀(21)和所述第一前置阀(22)一一对应。
  5. 根据权利要求2所述的C型液化气舱压力控制系统，其中，所述泄压组件还包括至少两个第二压力释放阀(23)，所述第二压力释放阀(23)为所述第一压力释放阀(21)的备用阀；
    全部所述第二压力释放阀(23)与所述C型液化气舱(1)连接，且与所述第一压力释放阀(21)并联；
    所述第二压力释放阀(23)与所述第一压力释放阀(21)对应设置。
  6. 根据权利要求5所述的C型液化气舱压力控制系统，其中，所述泄压组件还包括至少两个第二前置阀(24)，所述第二前置阀(24)一端与所述C型液化气舱(1)连接，另一端与所述第二压力释放阀(23)连接；
    所述第二前置阀(24)用于控制所述泄压组件的通断。
  7. 根据权利要求6所述的C型液化气舱压力控制系统，其中，第二压力释放阀(23)和所述第二前置阀(24)一一对应。
  8. 根据权利要求1所述的C型液化气舱压力控制系统，其中，所述泄压组件包括第一可调压力释放阀(31)，所述第一可调压力释放阀(31)与所述C型液化气舱(1)连接；
    所述第一可调压力释放阀(31)用于控制所述C型液化气舱(1)内压力小于所述C型 液化气舱(1)的设计压力。
  9. 根据权利要求8所述的C型液化气舱压力控制系统，其中，所述泄压组件还包括第三前置阀(32)，且沿所述C型液化气舱(1)内的介质流动方向，所述第三前置阀(32)和所述第一可调压力释放阀(31)依次设置；
    所述第三前置阀(32)用于控制所述泄压组件的通断。
  10. 根据权利要求9所述的C型液化气舱压力控制系统，其中，所述泄压组件还包括第二可调压力释放阀(33)和第四前置阀(34)，所述第二可调压力释放阀(33)为所述第一可调压力释放阀(31)的备用阀，且沿所述C型液化气舱(1)内的介质流动方向，所述第四前置阀(34)和所述第二可调压力释放阀(33)依次设置；
    所述第四前置阀(34)用于控制所述泄压组件的通断。
PCT/CN2022/108206 2021-08-03 2022-07-27 C型液化气舱压力控制系统 WO2023011282A1 (zh)

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