CN-224201506-U - Liquid phase tube heating vaporization structure of marine LNG fuel tank differential pressure type liquid level meter

CN224201506UCN 224201506 UCN224201506 UCN 224201506UCN-224201506-U

Abstract

The utility model relates to a liquid phase tube heating vaporization structure of a differential pressure type liquid level meter of a marine LNG fuel tank, and belongs to the technical field of marine LNG fuel tanks. The heating vaporization structure comprises a heating pipe, a pneumatic control valve is arranged on a liquid phase pipeline of the liquid level meter, the heating pipe is parallel and fixed on the liquid phase pipeline of the liquid level meter positioned at the rear end of the pneumatic control valve, one end of the heating pipe is connected with an inlet of a marine hot water tank, the other end of the heating pipe is connected with an outlet of the marine hot water tank, a temperature transmitter is arranged in the cold box, and the temperature transmitter is in signal connection with the hot water valve on the marine hot water tank. The starting end of the heating pipe and the liquid in the bottom of the LNG fuel tank are arranged at the same height. The utility model ensures the full vaporization of the medium, improves the accuracy and reliability of liquid level measurement, reduces the risk of faults and is suitable for the LNG fuel tank in a low-temperature environment.

Inventors

QIN FENG
Qian Yunhong
QIAN JIANG

Assignees

江苏秋林特能装备股份有限公司

Dates

Publication Date: 20260505
Application Date: 20250604

Claims (4)

1. The LNG fuel tank comprises an inner shell and an outer shell, wherein the inner shell is arranged in the outer shell, a gap is reserved between the outer shell and the inner shell to form an interlayer, a cold box is arranged on the outer shell, a differential pressure type liquid level meter is arranged in the cold box, a liquid level meter gas phase pipeline and a liquid level meter liquid phase pipeline are arranged in the interlayer, one ends of the liquid level meter gas phase pipeline and the liquid level meter liquid phase pipeline are respectively communicated with the inner shell, the other ends of the liquid level meter gas phase pipeline and the liquid level meter liquid phase pipeline are respectively connected with a differential pressure type liquid level meter and a liquid level transmitter, and the LNG fuel tank is characterized in that the LNG fuel tank comprises a heating pipe, a pneumatic control valve is arranged on the liquid level meter liquid phase pipeline, the heating pipe is parallelly fixed on the liquid level meter liquid phase pipeline positioned at the rear end of the pneumatic control valve, one end of the heating pipe is connected with an inlet of a marine hot water tank, the other end of the heating pipe is connected with an outlet of the marine hot water tank, a temperature transmitter is arranged in the cold box, and the temperature transmitter is in signal connection with the marine hot water valve on the marine hot water tank.
2. The marine LNG fuel tank differential pressure type liquid level meter liquid phase pipe heating vaporization structure of claim 1, wherein the starting end of the heating pipe and the liquid in the bottom of the LNG fuel tank are arranged at the same height.
3. The marine LNG fuel tank differential pressure type liquid phase pipe heating vaporization structure is characterized in that the inner shell comprises an inner barrel, inner sealing heads are respectively arranged at two ends of the inner barrel, the outer shell comprises an outer barrel, and outer sealing heads are respectively arranged at two ends of the outer barrel.
4. The differential pressure type liquid phase tube heating vaporization structure of the marine LNG fuel tank liquid phase meter of claim 1, wherein the heating tube is a small-caliber stainless steel tube.

Description

Liquid phase tube heating vaporization structure of marine LNG fuel tank differential pressure type liquid level meter Technical Field The utility model relates to a liquid phase tube heating vaporization structure of a differential pressure type liquid level meter of a marine LNG fuel tank, and belongs to the technical field of marine LNG fuel tanks. Background In order to cope with the environmental pollution problem, international Maritime Organization (IMO) has made strict demands on ship emissions, and LNG is widely used as a clean fuel. The marine LNG fuel tank adopts differential pressure type liquid level meter to detect liquid level, and liquid phase pipe and gas phase pipe are led out from liquid phase and gas phase space of the fuel tank respectively, and the liquid level monitoring is realized by converting differential pressure signals into electric signals. However, in the prior art, due to poor air convection and low temperature, the liquid phase tube of the liquid level meter is insufficient in vaporization in the cold box, and particularly in winter or high-latitude areas, the problem that the liquid level meter is frozen or inaccurate in measurement easily occurs, so that the normal execution of a shipping plan is influenced. Disclosure of Invention The technical problem to be solved by the utility model is to provide the liquid phase tube heating vaporization structure of the differential pressure type liquid level meter for the marine LNG fuel tank aiming at the prior art, so that the medium is fully vaporized, and the measuring accuracy and reliability of the liquid level meter are improved. The technical scheme includes that the LNG fuel tank comprises an inner shell and an outer shell, the inner shell is arranged in the outer shell, a gap is reserved between the outer shell and the inner shell to form an interlayer, a cold box is arranged on the outer shell, a differential pressure type liquid level meter is arranged in the cold box, a liquid level meter gas phase pipeline and a liquid level meter liquid phase pipeline are arranged in the interlayer, one ends of the liquid level meter gas phase pipeline and the liquid level meter liquid phase pipeline are respectively communicated with the inner shell, the other ends of the liquid level meter gas phase pipeline and the liquid level meter liquid phase pipeline are respectively connected with a differential pressure type liquid level meter and a liquid level transmitter, the heating vaporization structure comprises a heating pipe, a pneumatic control valve is arranged on the liquid level meter liquid phase pipeline, the heating pipe is parallelly fixed on the liquid level meter liquid phase pipeline at the rear end of the pneumatic control valve, one end of the heating pipe is connected with a marine hot water tank inlet, the other end of the heating pipe is connected with a marine hot water tank outlet, a temperature transmitter is arranged in the cold box, and the temperature transmitter is in signal connection with the marine hot water valve on the hot water tank. The starting end of the heating pipe and the liquid in the bottom of the LNG fuel tank are arranged at the same height. The inner shell comprises an inner cylinder, inner sealing heads are respectively arranged at two ends of the inner cylinder, the outer shell comprises an outer cylinder, and outer sealing heads are respectively arranged at two ends of the outer cylinder. The heating pipe is a small-caliber stainless steel pipe manufactured piece. Compared with the prior art, the liquid phase tube heating vaporization structure of the differential pressure type liquid level meter of the marine LNG fuel tank has the advantages that a heating tube is fixed on a liquid phase tube of the liquid level meter at the rear end of the pneumatic control valve and is connected with a marine hot water tank, so that a hot water circulation system is formed, and the problem of insufficient vaporization caused by low temperature in a cold tank is solved. The utility model ensures the full vaporization of the medium, improves the accuracy and reliability of liquid level measurement, reduces the risk of faults and is suitable for the LNG fuel tank in a low-temperature environment. Drawings Fig. 1 is a schematic installation diagram of a liquid phase tube heating vaporization structure of a differential pressure type liquid level meter for a marine LNG fuel tank according to an embodiment of the present utility model; FIG. 2 is an enlarged view of I in FIG. 1; In the figure, an inner cylinder 1, an outer cylinder 2, an inner seal head 3, an interlayer 4, an outer seal head 5, a liquid level meter gas phase pipeline 6, a liquid level meter liquid phase pipeline 7, an 8 cold box, a 9 pneumatic control valve, a 10 heating pipe, an 11 differential pressure type liquid level meter, a 12 temperature transmitter and a 13 liquid level transmitter are arranged. Detailed Description The utility model