KR20120018420A - Sensing apparatus and method thereof of emission of evaporative gas in lng tank - Google Patents

Sensing apparatus and method thereof of emission of evaporative gas in lng tank Download PDF

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KR20120018420A
KR20120018420A KR1020100081203A KR20100081203A KR20120018420A KR 20120018420 A KR20120018420 A KR 20120018420A KR 1020100081203 A KR1020100081203 A KR 1020100081203A KR 20100081203 A KR20100081203 A KR 20100081203A KR 20120018420 A KR20120018420 A KR 20120018420A
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South Korea
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gas
relief valve
pressure
boil
tank
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KR1020100081203A
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Korean (ko)
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KR101585416B1 (en
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이강웅
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현대자동차주식회사
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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
    • 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
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/025—Special adaptations of indicating, measuring, or monitoring equipment having the pressure as the parameter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D5/00—Protection or supervision of installations
    • F17D5/02—Preventing, monitoring, or locating loss
    • F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means
    • 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

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

Abstract

PURPOSE: An apparatus and a method for sensing the emission amount of evaporative gas from an LNG tank are provided to lower the internal pressure of an LNG tank when the pressure of evaporative gas in the LNG tank increases, thereby preventing LNG weathering. CONSTITUTION: An apparatus for sensing the emission amount of evaporative gas from an LNG tank comprises a cylinder(10), a stator(20), a spool(40), and a piezoelectric element(50). The inlet of the cylinder is connected to the inside of an LNG tank and formed with an evaporative gas induction path(12) in which a support protrusion(11) is formed. The stator is fixed inside the cylinder and has an emission hole for discharging evaporative gas to an outlet. The spool is set on the support protrusion and closes the induction path by the elasticity of an elastic unit. The piezoelectric element generates electricity according to pressure.

Description

ＬＮＧ 탱크의 증발가스 배출량 감지장치 및 그 감지방법{Sensing apparatus and method thereof of emission of evaporative gas in LNG tank}Sensing apparatus and method of detecting evaporative gas emission of LG tank {Sensing apparatus and method about of emission of evaporative gas in LNG tank}

본 발명은 LNG 탱크 내에서 증발가스 배출량을 감지하는 장치 및 그 감지방법에 관한 것으로, 더욱 상세하게는 LNG 탱크 내에서 웨더링 현상이 발생했는지 여부를 판별하기 위하여 압전효과(Piezo electric effect)를 이용해 메탄가스의 배출량을 감지하는 장치 및 그 방법에 관한 것이다.
The present invention relates to a device for detecting the discharge of boil-off gas in the LNG tank, and more particularly, to methane using a piezo electric effect to determine whether weathering phenomenon has occurred in the LNG tank. An apparatus and a method for detecting the emission of gas.

LNG(액화천연가스)는 천연가스를 운송의 편의성 및 수요변동에 따른 보관성을 증대시킬 목적으로 액화시킨 것으로서, 액화 공전 전에 탈황, 탈습되기 때문에 유해물질이 적고 고칼로리라는 점 등에서 장점이 많다.LNG (liquefied natural gas) is a liquefied natural gas for the purpose of increasing the convenience of transportation and storage according to demand fluctuations, and there are many advantages such as less harmful substances and high calorie because it is desulfurized and dehumidified before liquefaction.

이러한 LNG 는 천연가스를 약 600 배 정도 압축시킨 상태로 운송 및 보관되며, 무색 무취인 특성을 갖는다.The LNG is transported and stored in a state of compressed about 600 times of natural gas, and is colorless and odorless.

그리고, LNG(Liquified natural gas)를 연료로 하는 차량은 연료비가 상대적으로 저렴하고 공해 물질이 배출이 적어 버스와 같은 대형 차량을 중심으로 보급되고 있다.In addition, vehicles that use LNG (Liquified natural gas) as fuels are being supplied mainly in large vehicles such as buses due to relatively low fuel costs and low emission of pollutants.

하지만, 차량 연료로 사용되는 LNG 는 -120oC 내지 -162oC 상태로 저장되므로, 시간이 경과함에 따라 탱크의 내부온도와 외부온도 차이로 인하여 탱크 내의 LNG 온도가 상승하는 문제가 있었다.However, since LNG used as a vehicle fuel is stored in a state of -120 o C to -162 o C, there is a problem that the LNG temperature in the tank increases due to the difference between the internal temperature and the external temperature of the tank as time passes.

탱크 내의 LNG 온도가 상승하면, 진공도가 떨어지고 동시에 일부 성분이 기화하여 탱크 압력이 최대 안전 압력까지 상승하였고, LNG 의 성분 비에도 변화가 발생하는 것이다.When the LNG temperature in the tank rises, the degree of vacuum drops and at the same time, some of the components vaporize and the tank pressure rises to the maximum safety pressure, and the change in the component ratio of LNG occurs.

즉, LNG 의 성분 중 메탄은 다른 성분보다 끓는 점이 낮기 때문에 상기와 같은 문제가 누적되면 탱크 내 잔류 LNG 에는 메탄 성분이 감소하게 되었고, 이에 따라 연료의 옥탄가 및 발열량 변화에 따라 엔진 내에서 불완전한 폭발을 일으키는 원인이 되었다.In other words, since methane has a lower boiling point than other components of LNG, when the above problems accumulate, methane is reduced in the remaining LNG in the tank. Accordingly, incomplete explosion in the engine occurs due to the change in fuel octane value and calorific value. It caused.

이와 같이 시간이 지남에 따라 LNG 탱크 내에서 메탄이 증발가스로 기화하여 고비점의 연료성분이 농축되는 현상을 LNG 웨더링(weathering)이라고 하며, 이러한 현상은 엔진의 정밀한 연료공급에 장애요인으로 작용한다.
As time goes by, methane vaporizes into the boil-off gas in the LNG tank and the high boiling point of fuel is concentrated. This phenomenon is an obstacle to the precise fuel supply of the engine. .

따라서, 엔진을 보호하기 위해 웨더링 현상에 대비할 수 있도록 LNG 탱크 내의 LNG 에서 미리 정해진 조건 이하로 메탄 성분이 감소하면 이를 운전자에게 경고해줄 필요가 있었다.Therefore, to protect the engine, it was necessary to warn the driver of the methane component reduction in the LNG in the LNG tank below a predetermined condition so as to prepare for the weathering phenomenon.

그리고, LNG 탱크 내의 LNG 가 미리 정해진 조건 하의 웨더링 상태로 함량비율이 변화하였는지 감별 여부는, 연료탱크 내에 남겨진 LNG 양과 대비하여 증발된 메탄가스의 압력 또는 부피를 비교하면 파악 가능하였다.In addition, it was possible to determine whether the content ratio of the LNG in the LNG tank changed to a weathering state under a predetermined condition by comparing the pressure or volume of the evaporated methane gas with respect to the amount of LNG remaining in the fuel tank.

따라서, 연료탱크 내의 남은 LNG 의 수위(水位)는 연료량 계측기 또는 센서 등을 통하여 측정가능하므로, 기화된 메탄의 증발가스 압력을 측정하면 웨더링 조건인지 여부를 감별할 수 있었다. Therefore, since the water level of the remaining LNG in the fuel tank can be measured by a fuel amount measuring instrument or a sensor, it is possible to discriminate whether or not weathering conditions are measured by measuring the evaporation gas pressure of vaporized methane.

본 발명은 전술한 바와 같이 LNG 탱크 내에 저장된 LNG 가 웨더링 상태에 놓였는지를 파악하기 위하여 증발가스의 압력을 측정하는 감지장치 및 감지방법을 제공하는 것에 주된 목적이 있다.
The present invention has a main object to provide a sensing device and a sensing method for measuring the pressure of the boil-off gas in order to determine whether the LNG stored in the LNG tank is in a weathering state as described above.

상기와 같은 목적을 달성하기 위한 본 발명의 감지장치는, LNG 탱크의 증발가스 배출량의 감지장치에 있어서, 입구는 LNG 탱크 내부와 개통되고 출구는 외부로 개통되며, 입구측에는 증발가스가 유입되는 유입로가 형성되고 상기 유입로의 내측으로 지지턱이 형성된 실린더;와 상기 실린더 내부에 고정장착되되 증발가스가 출구로 배출되도록 유출홀이 타공된 고정자;와 상기 탄성수단에 의해 고정자와 연결되어 지지턱에 안착하고 상기 탄성수단의 탄성력으로 유입로를 폐쇄하는 스풀; 및 압력에 따라 전기를 발생시키는 압전소자;를 포함하며,상기 스풀은 증발가스의 압력에 따라 탄성력을 극복하여 유입로를 개방하고, 상기 압전소자는 유입로의 개방시 증발가스의 압력에 따라 상이한 전압으로 전기를 발생시키도록 실린더 내에 장착된 것을 특징으로 한다.In the sensing device of the present invention for achieving the above object, in the detection device of the evaporation gas emissions of the LNG tank, the inlet is opened and the outlet is opened to the outside, the inlet side is the inlet to the boil-off gas A cylinder in which a furnace is formed and a support jaw is formed inwardly of the inflow path; and a stator fixedly mounted in the cylinder but having an outlet hole perforated so that boil-off gas is discharged to an outlet; and a support jaw connected to the stator by the elastic means. A spool seated in and closing the inflow path with the elastic force of the elastic means; And a piezoelectric element for generating electricity according to the pressure, wherein the spool overcomes the elastic force according to the pressure of the boil-off gas to open the inlet passage, and the piezoelectric element differs depending on the pressure of the boil-off gas upon opening the inlet passage. And mounted in the cylinder to generate electricity with voltage.

상기 고정자는 원반형 형상이고, 유출홀은 고정자의 둘레를 따라 다수 개가 일정간격으로 형성된 것이 바람직하다.Preferably, the stator has a disk shape, and a plurality of outlet holes are formed at regular intervals along the circumference of the stator.

아울러, 본 발명의 감지방법은, LNG 탱크의 증발가스 배출량 감지방법에 있어서, 상기 LNG 탱크는 내부의 증발가스 압력이 미리 정해진 기준 압력 이상이면 상기 증발가스를 외부로 배출하는 릴리프밸브가 장착되되, 상기 릴리프밸브는 증발가스의 배출시 증발가스의 압력에 따라 전기를 발생시키는 압전소자가 설치되어, 상기 압전소자에서 발생된 전기량을 계측하여 증발가스의 배출량을 계산하는 것을 특징으로 한다.In addition, the detection method of the present invention, in the LNG tank evaporation gas emissions detection method, the LNG tank is equipped with a relief valve for discharging the boil-off gas to the outside when the pressure of the boil-off gas inside the predetermined reference pressure or more, The relief valve is installed with a piezoelectric element for generating electricity in accordance with the pressure of the evaporation gas when the discharge of the boil-off gas, characterized in that for calculating the discharge amount of the boil-off gas by measuring the amount of electricity generated in the piezoelectric element.

상기 릴리프밸브는 제1릴리프밸브와 제2릴리프밸브가 다른 위치에서 개별적으로 장착되고, 상기 제1릴리프밸브와 제2릴리프밸브는 증발가스의 배출이 시작되는 기준 압력이 상이하게 설정된 것이 바람직하다.
It is preferable that the relief valve is separately mounted to the first relief valve and the second relief valve at different positions, and the first relief valve and the second relief valve are preferably set to have different reference pressures at which the discharge of the boil-off gas is started.

상기와 같은 구성의 본 발명은, LNG 탱크 내부에 증발가스의 압력이 상승하면 안전을 위해 LNG 탱크 내부 압력을 낮추며, 동시에 배출된 증발가스량을 측정할 수 있는 효과가 있다.According to the present invention having the above configuration, when the pressure of the boil-off gas rises in the LNG tank, the pressure inside the LNG tank is lowered for safety, and at the same time, the amount of the boil-off gas is measured.

또한, 본 발명의 증발가스 배출량 감지장치인 릴리프밸브는 종래의 릴리프밸브에 압전소자를 장착하여 구성할 수 있으므로 생산이 유리하고 LNG 탱크 조립시 별도의 추가적인 공정을 필요로 하지 않는다.In addition, the relief valve of the evaporation gas discharge device of the present invention can be configured by mounting a piezoelectric element to the conventional relief valve is advantageous in production and does not require a separate additional process when assembling the LNG tank.

아울러, 본 발명의 릴리프밸브는 개방압력이 상이한 제1릴리프밸브와 제2릴리프밸브로 구성되어, 제1릴리프밸브에서 압력조절이 실패할 경우 제2릴리프밸브가 개방되어 증발가스를 배출할 수 있으므로, 제1릴리프밸브에 과다 압력이 가해져 파손되는 것을 방지할 수 있다.
In addition, the relief valve of the present invention is composed of a first relief valve and a second relief valve having a different opening pressure, and when the pressure control fails in the first relief valve, the second relief valve can be opened to discharge the boil-off gas. In addition, excessive pressure is applied to the first relief valve to prevent damage.

도 1 은 본 발명의 바람직한 실시예에 따라 제1릴리프밸브와 제2릴리프밸브가 장착된 LNG 탱크의 단면도,
도 2 는 제1릴리프밸브가 닫혔을 때의 모습을 부분확대한 단면도 및 압전소자에서 발생한 전압의 그래프를 도시한 도면,
도 3 는 제1릴리프밸브가 개방됐 때의 모습을 부분확대한 단면도 및 압전소자에서 발생한 전압의 그래프를 도시한 도면.1 is a cross-sectional view of an LNG tank equipped with a first relief valve and a second relief valve according to a preferred embodiment of the present invention;
FIG. 2 is a sectional view partially enlarged to show a state when the first relief valve is closed and a graph of voltage generated in the piezoelectric element; FIG.
Fig. 3 is a sectional view partially enlarged to show the state when the first relief valve is opened and a graph of the voltage generated in the piezoelectric element.

본 발명의 증발가스 배출량 감지장치는 릴리프밸브로서, 상기 릴리프밸브는, 입구가 LNG 탱크 내부와 개통되고 출구는 외부로 개통되며 입구측에는 증발가스가 유입되는 유입로를 형성하고 상기 유입로의 내측으로 지지턱이 형성된 실린더;와 상기 실린더 내부에 고정장착되되 증발가스가 출구로 배출되도록 유출홀이 타공된 고정자;와 상기 탄성수단에 의해 고정자와 연결되어 지지턱에 안착하고 상기 탄성수단의 탄성력으로 유입로를 폐쇄하는 스풀; 및 압력에 따라 전기를 발생시키는 압전소자;를 포함하여 구성된다. Evaporation gas discharge detection device of the present invention is a relief valve, the relief valve, the inlet is opened to the inside of the LNG tank, the outlet is opened to the outside and the inlet side forms an inlet for the boil-off gas flows into the inside of the inlet A cylinder having a support jaw; and a stator fixedly mounted in the cylinder but having an outlet hole perforated so that the evaporation gas is discharged to the outlet; and connected to the stator by the elastic means and seated on the support jaw and flowing into the elastic force of the elastic means. Spool to close the furnace; And a piezoelectric element for generating electricity in accordance with the pressure.

그리고, 상기 스풀은 증발가스의 압력에 따라 탄성력을 극복하여 유입로를 개방하고, 상기 압전소자는 유입로의 개방시 증발가스의 압력에 따라 상이한 전압으로 전기를 발생시키도록 실린더 내에 장착된다.The spool overcomes the elastic force according to the pressure of the boil-off gas to open the inflow path, and the piezoelectric element is mounted in the cylinder to generate electricity at a different voltage according to the pressure of the boil-off gas at the time of opening the inflow path.

참고적으로, 상기 압전소자는 가압 되었을 때 결정의 곁 면에 전기적 분극이 일어나는 현상을 이용해 전기를 발생시키는 것으로서, 압전효과가 나타나는 물질로는 수정, 로셀염, 티탄산바륨, 인공세라믹(PZT) 등이 있다. 상기 압전소자는 가해지는 힘의 방향, 사용 물질, 전기 발생용량에 따라 다양한 분야에서 사용되며, 본 발명의 압전소자는 증발가스 배출량을 더 정확하게 계측할 수 있도록 (증발가스 유입) 압력에 따라 선형(linear)으로 비례하여 전위차를 발생시키는 형태로 구성되는 것이 바람직하다.For reference, the piezoelectric element is used to generate electricity by using the phenomenon that the electrical polarization occurs on the side of the crystal when pressed, the material exhibiting a piezoelectric effect, such as crystal, rosell salt, barium titanate, artificial ceramics (PZT), etc. There is this. The piezoelectric element is used in various fields according to the direction of the force applied, the material used, the electricity generating capacity, the piezoelectric element of the present invention is linear (according to the evaporation gas inlet) pressure to more accurately measure the evaporation gas emissions (evaporation gas inlet) linear) to generate a potential difference in proportion.

도 1 에 기재된 바와 같이, 상기 릴리프밸브는, 동일한 구성을 갖도록 제조된 제1릴리프밸브(100)와 제2릴리프밸브(200)가 LNG 탱크(300)에서 분기된 관(pipe)들을 통하여 다른 위치에서 개별적으로 장착된다. 그리고, 상기 제1릴리프밸브(100)와 제2릴리프밸브(200)는 증발가스의 배출이 시작되는 기준 압력이 상이하게 설정된다. 즉, 제1릴리프밸브(100)는 내부압력이 190 PSI(바람직하게는 196 PSI) 이상일 때 스풀이 탄성수단의 탄성력을 극복하여 유입로를 개방시키고, 제2릴리프밸브는 내부압력이 230 PSI 이상일 때 유입로를 개방시키도록 구성된다. As illustrated in FIG. 1, the relief valve has a different position through pipes branched from the LNG tank 300 by the first relief valve 100 and the second relief valve 200 manufactured to have the same configuration. Are fitted separately. The first relief valve 100 and the second relief valve 200 have different reference pressures at which the discharge of the boil-off gas is started. That is, when the internal pressure of the first relief valve 100 is 190 PSI (preferably 196 PSI) or more, the spool overcomes the elastic force of the elastic means to open the inflow path, and the second relief valve has an internal pressure of 230 PSI or more. When the inlet is opened.

따라서, 제1릴리프밸브와 제2릴리프 밸브는 동일한 구조로 구성되되 각각 상이한 탄성계수를 갖는 압축스프링들을 탄성수단으로 구비한다.Accordingly, the first relief valve and the second relief valve have the same structure, but each of the compression springs having different elastic modulus is provided as the elastic means.

도 2 와 도 3 을 참조하여, 본 발명의 감지장치인 릴리프밸브를 더 상세히 설명한다. (도 2 와 도 3 에 도시된 릴리프밸브는 제1릴리프밸브이고 제2릴리프밸브는 동일한 구조 구성된다.)2 and 3, the relief valve of the sensing device of the present invention will be described in more detail. (The relief valve shown in Figs. 2 and 3 is the first relief valve and the second relief valve has the same structure.)

도시된 바와 같이, 실린더(10)는 입구와 출구측이 개통된 관(pipe)형상으로 각각 LNG 탱크 내부와 외부로 연결되고, 입구측에는 내경이 더 작은 유입로(12)가 형성된다. 상기 유입로(12)의 내측(도면에서 상측)으로는 스풀(40)의 안착되어 유입로(12)를 폐쇄할 수 있도록 지지턱(11)이 형성된다. 상기 지지턱(11)은 스풀(40)의 접착면 형상에 따라 일정한 경사면을 갖도록 형성된다.As shown, the cylinder 10 is connected to the inside and the outside of the LNG tank in the shape of a pipe (pipe), the inlet and the outlet side is opened, respectively, and the inlet path 12 having a smaller inner diameter is formed on the inlet side. The support jaw 11 is formed on the inner side (the upper side in the figure) of the inflow path 12 so that the spool 40 may be seated to close the inflow path 12. The support jaw 11 is formed to have a predetermined inclined surface according to the adhesive surface shape of the spool 40.

상기 지지턱(11)과 소정의 거리를 두고 실린더(10) 내에는 고정자(20)가 고정설치된다. 상기 고정자(20)는 원반형상으로서 실린더(10) 내부로 유입된 증발가스가 출구측으로 배출될 수 있도록 유출홀(21)이 형성된다. 상기 유출홀(21)은 고정자(20)의 둘레를 따라 다수 개가 일정간격으로 형성된다. The stator 20 is fixedly installed in the cylinder 10 at a predetermined distance from the support jaw 11. The stator 20 has a disc shape, and an outlet hole 21 is formed to allow the evaporated gas introduced into the cylinder 10 to be discharged to the outlet side. A plurality of outlet holes 21 are formed at regular intervals along the circumference of the stator 20.

그리고, 상기 유입로(12)를 개폐하는 스풀(40)은 일부가 유입로(12)에 부분적으로 삽입되어 증발가스를 완전히 차폐할 수 있도록 원뿔형상으로 형성되되, 상기 고정자(20)와는 탄성수단(30)으로 연결된다. And, the spool 40 for opening and closing the inlet 12 is formed in a conical shape so that a part is partially inserted into the inlet 12 to completely shield the evaporated gas, the stator 20 and the elastic means Connected to 30.

따라서, 상기 스풀(40)은 탄성수단의 탄성력에 의해 가압되어 유입로(12)를 폐쇄하되, 증발가스의 압력이 탄성수단(30)의 탄성력을 극복하면 도 3 과 같이 상승하여 증발가스를 실린더(10) 내부로 유입시킨다. 상기 탄성수단(30)은 압축에 저항하는 탄성력을 갖는 압축스프링인 것이 바람직하며, 압축스프링의 탄성계수는 증발가스의 배출이 시작되는 기준 압력 셋팅에 따라 정해진다.Therefore, the spool 40 is pressurized by the elastic force of the elastic means to close the inflow path 12, but when the pressure of the boil-off gas overcomes the elastic force of the elastic means 30, as shown in FIG. (10) flows into the interior. The elastic means 30 is preferably a compression spring having an elastic force to resist compression, the elastic modulus of the compression spring is determined according to the reference pressure setting to start the discharge of the boil-off gas.

한편, 본 발명의 압전소자(50)는 스풀(40)의 표면에 장착 또는 도포되되, 증발가스 유입시 즉각적으로 전위차(전압)을 발생시킬 수 있도록 걸림턱(11)과 마주하는 면(面) 및/또는 유입로(12)에 진입한 부분에 장착된다. 그리고, 상기 압전소자(50)에서 발생한 전기는 측정기에서 계측되고 계측된 데이터는 증폭기(amplifier)를 거쳐 컨트롤유닛(LCU: LNG Control unit)으로 제공되도록 구성된다. On the other hand, the piezoelectric element 50 of the present invention is mounted or coated on the surface of the spool 40, the surface facing the locking step 11 so that the potential difference (voltage) can be generated immediately when the evaporated gas inflow And / or mounted at the portion entering the inflow path 12. In addition, the electricity generated in the piezoelectric element 50 is measured by the measuring device and the measured data is configured to be provided to a control unit (LCU: LNG Control unit) via an amplifier.

따라서, 도 2 와 도 3 의 하단에 그래프들에 도시된 바와 같이, 스풀(40)의 상승에 따라 시간 대비 전압의 변화를 감지할 수 있으며, 이러한 전압의 변화는 증발가스의 압력과 비례하므로 전압변화를 변수로 하여 제1릴리프밸브 및 제2릴리프밸브의 개방 시간 동안에 배출된 증발가스의 양을 계산해 낼 수 있다.Thus, as shown in the graphs at the bottom of Figures 2 and 3, it is possible to detect a change in the voltage over time as the spool 40 rises, the change in the voltage is proportional to the pressure of the evaporating gas voltage Using the change as a variable, the amount of evaporated gas discharged during the opening time of the first relief valve and the second relief valve can be calculated.

그러므로, 상기와 같이 계산된 증발가스 양과 LNG 탱크 내에 LNG 의 량을 비교하여 컨트롤유닛은, LNG 탱크에 남은 LNG 가 미리 정해진 조건 하의 웨더링 상태 놓이게 됐는지 여부를 계산할 수 있다. Therefore, by comparing the amount of boil-off gas calculated as described above with the amount of LNG in the LNG tank, the control unit can calculate whether the LNG remaining in the LNG tank is in a weathering state under a predetermined condition.

이상과 같이 본 명세서와 도면에 개시된 실시예들은 본 발명의 이해를 돕기 위해 특정 예를 제시한 것에 지나지 않으며, 본 발명의 범위를 제한하고자 하는 것은 아니다. 여기에 개시된 실시예들 이외에도 본 발명의 기술적 사상에 바탕을 둔 다른 변형예들이 실시 가능하다는 것은 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에게 자명한 것이다.
As described above, the embodiments disclosed in the specification and the drawings are only presented as specific examples to aid the understanding of the present invention, and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

10 : 실린더
20 : 고정자
30 : 탄성수단
40 : 압전소자10: cylinder
20: stator
30: elastic means
40: piezoelectric element

Claims (4)

ＬＮＧ 탱크의 증발가스 배출량의 감지장치에 있어서,
입구는 LNG 탱크 내부와 개통되고 출구는 외부로 개통되며, 입구측에는 증발가스가 유입되는 유입로가 형성되고 상기 유입로의 내측으로 지지턱이 형성된 실린더;와
상기 실린더 내부에 고정장착되되 증발가스가 출구로 배출되도록 유출홀이 타공된 고정자;와
상기 탄성수단에 의해 고정자와 연결되어 지지턱에 안착하고 상기 탄성수단의 탄성력으로 유입로를 폐쇄하는 스풀; 및
압력에 따라 전기를 발생시키는 압전소자;를 포함하며,
상기 스풀은 증발가스의 압력에 따라 탄성력을 극복하여 유입로를 개방하고, 상기 압전소자는 유입로의 개방시 증발가스의 압력에 따라 상이한 전압으로 전기를 발생시키도록 실린더 내에 장착된 것을 특징으로 하는 ＬＮＧ 탱크의 증발가스 배출량의 감지장치.
In the device for detecting the evaporation gas discharge of the tank,
An inlet is opened with an inside of the LNG tank and an outlet is opened with an inlet, and an inlet is formed with an inflow path through which an inlet gas is introduced and a support jaw is formed inside the inflow path; and
A stator fixedly mounted in the cylinder but having an outlet hole perforated to discharge the evaporated gas to the outlet; and
A spool connected to the stator by the elastic means and seated on the support jaw and closing the inflow path by the elastic force of the elastic means; And
It includes; a piezoelectric element for generating electricity in accordance with the pressure,
The spool overcomes the elastic force according to the pressure of the boil-off gas to open the inlet, and the piezoelectric element is mounted in the cylinder to generate electricity at a different voltage according to the pressure of the boil-off gas at the time of opening the inlet. A device for detecting the amount of boil-off gas in the tank.
제 1 항에 있어서, 상기 고정자는 원반형 형상이고, 유출홀은 고정자의 둘레를 따라 다수 개가 일정간격으로 형성된 것을 특징으로 하는 ＬＮＧ 탱크의 증발가스 배출량의 감지장치.
The apparatus of claim 1, wherein the stator has a disc shape and a plurality of outlet holes are formed at regular intervals along a circumference of the stator.
ＬＮＧ 탱크의 증발가스 배출량 감지방법에 있어서,
상기 LNG 탱크는 내부의 증발가스 압력이 미리 정해진 기준 압력 이상이면 상기 증발가스를 외부로 배출하는 릴리프밸브가 장착되되,
상기 릴리프밸브는 증발가스의 배출시 증발가스의 압력에 따라 전기를 발생시키는 압전소자가 설치되어, 상기 압전소자에서 발생된 전기량을 계측하여 증발가스의 배출량을 계산하는 것을 특징으로 하는 ＬＮＧ 탱크의 증발가스 배출량 감지방법.
In the method of detecting the amount of boil-off gas of the LG tank,
The LNG tank is equipped with a relief valve for discharging the boil-off gas to the outside when the boil-off gas pressure inside the predetermined reference pressure or more,
The relief valve is provided with a piezoelectric element for generating electricity in accordance with the pressure of the evaporation gas when the evaporation gas is discharged, the evaporation of the LNK tank, characterized in that by calculating the amount of evaporated gas by measuring the amount of electricity generated in the piezoelectric element Gas emissions detection method.
제 3 항에 있어서, 상기 릴리프밸브는 제1릴리프밸브와 제2릴리프밸브가 다른 위치에서 개별적으로 장착되고, 상기 제1릴리프밸브와 제2릴리프밸브는 증발가스의 배출이 시작되는 기준 압력이 상이하게 설정된 것을 특징으로 하는 ＬＮＧ 탱크의 증발가스 배출량 감지방법.
The method of claim 3, wherein the relief valve is mounted separately from the first relief valve and the second relief valve in a different position, the first relief valve and the second relief valve is different from the reference pressure at which the discharge of the evaporation gas starts Evaporation gas emissions detection method of the tank, characterized in that set to be.
KR1020100081203A 2010-08-23 2010-08-23 Sensing apparatus and method thereof of emission of evaporative gas in LNG tank KR101585416B1 (en)

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