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CN-121993323-A - LNG fuel gas supply system of oversized tank ship

CN121993323ACN 121993323 ACN121993323 ACN 121993323ACN-121993323-A

Abstract

The invention discloses an LNG fuel gas supply system of an oversized tank ship, which is applied to the field of engine fuel supply, and the LNG fuel gas supply system is characterized in that an air-temperature gasifier and a water bath gasifier are arranged in series to realize two-stage gasification treatment of LNG, so that the risk of damaging a downstream pipeline by unvaporized LNG is reduced, meanwhile, the environmental heat energy is preferentially utilized, and only water bath heating is assisted when needed, so that the operation energy consumption is obviously reduced; meanwhile, the electric heating pipe is utilized to assist gasification in the engine starting stage, and the stable operation stage is switched to the cylinder sleeve circulating hot water heating, so that the gasification reliability under different working conditions is ensured; in addition, the system also seals the pipeline valve member and the flange member through the seal box, reduces the contact of environmental moisture, reduces the risks of freezing of the outer walls of the joint and the valve member, blocking of moving parts and reduction of tightness, and reduces the humidity in the box by matching with the dehumidifier, and utilizes the partition plate to guide the air flow to circulate and flow, so that the dehumidification efficiency and the anti-freezing effect are further improved.

Inventors

  • XU JIANGTONG
  • Li Exiang
  • QIAN QI
  • Ni Shengdie
  • Gu Zezheng

Assignees

  • 江苏韩通船舶重工有限公司

Dates

Publication Date
20260508
Application Date
20260320

Claims (8)

  1. 1. The LNG fuel gas supply system of the oversized tank ship is characterized by comprising a storage tank (1), wherein the storage tank (1) is communicated with an air temperature gasifier (3) through a liquid discharge pipeline (2), the air temperature gasifier (3) is communicated with a water bath gasifier (5) through an exhaust pipeline (4), and the water bath gasifier (5) is communicated with a fuel gas inlet of an engine (7) through a pressure regulating pipeline (6); The water bath gasifier (5) comprises a shell (501), wherein a heat exchange tube assembly (502) is arranged in the shell (501), the lower end of the heat exchange tube assembly (502) is communicated with an outlet of an exhaust pipeline (4), the upper end of the heat exchange tube assembly (502) is communicated with an inlet of a pressure regulating pipeline (6), the outer wall of the heat exchange tube assembly (502) is fixedly connected with a plurality of heat exchange fins (503) which are distributed linearly at equal intervals, the inner wall of the shell (501) is fixedly connected with an electric heating tube (508), circulating water is filled in the shell (501), and the electric heating tube (508) is used for heating the circulating water in the shell (501); The utility model discloses a water bath gasifier, including shell (501), cylinder liner (8), water return manifold (12), shell (501) right-hand member fixed intercommunication has first water inlet joint (506), first water inlet joint (506) fixed intercommunication has first water inlet branch pipe (10), first water inlet branch pipe (10) right-hand member fixed intercommunication has water inlet manifold (9), water inlet manifold (9) right-hand member and the delivery port of cylinder liner (8) fixed intercommunication, the left end fixed intercommunication of shell (501) has first water outlet joint (507), first water outlet joint (507) left end fixed intercommunication has first water outlet branch pipe (11), first water outlet branch pipe (11) left end fixed intercommunication has return water manifold (12), return water manifold (12) right-hand member and the water inlet end fixed intercommunication of cylinder liner (8), hot water circulating pump (13) make hot water circulation flow between cylinder liner (8) and water bath gasifier (5).
  2. 2. The LNG fuel supply system for the oversized tank ship according to claim 1, wherein the first water inlet connector (506) and the first water outlet connector (507) are symmetrically disposed at two sides of the housing (501), a pair of symmetrically disposed dispersing plates (504) are disposed at outer sides of the heat exchange fins (503), the pair of dispersing plates (504) are fixedly connected with an inner wall of the housing (501), the dispersing plates (504) are disposed opposite to the first water inlet connector (506), a plurality of equally spaced dispersing grooves (505) are disposed on the dispersing plates (504), and gaps between the dispersing grooves (505) and adjacent heat exchange fins (503) are disposed opposite to each other.
  3. 3. The LNG fuel supply system for the oversized tank ship according to claim 2, wherein the housing (501) is a hollow rectangular box, the dispersion plates (504) are rectangular plates, and the pair of dispersion plates (504) divide the inner cavity of the housing (501) into three cavities, adjacent cavities are communicated through dispersion grooves (505), and the dispersion grooves (505) are bar-shaped through grooves.
  4. 4. The LNG fuel gas supply system of the oversized tank ship according to claim 1, wherein a first-stage pressure reducing valve (23) and a second-stage pressure reducing valve (24) are fixedly connected to the pressure regulating pipeline (6), a heating cylinder (15) is fixedly sleeved on a pipe section between the pressure regulating pipeline (6) corresponding to the first-stage pressure reducing valve (23) and the second-stage pressure reducing valve (24), a second water inlet branch pipe (14) is fixedly communicated with a water inlet end of the heating cylinder (15), one end of the second water inlet branch pipe (14) away from the heating cylinder (15) is communicated with a water inlet main pipe (9), a second water outlet branch pipe (16) is fixedly communicated with a water outlet end of the heating cylinder (15), and one end of the second water outlet branch pipe (16) away from the heating cylinder (15) is fixedly communicated with a water return main pipe (12).
  5. 5. The LNG fuel supply system of the oversized tank ship according to claim 4, wherein the heating cylinder (15) comprises a cylinder body (1501), the cylinder body (1501) is fixedly sleeved on the pressure regulating pipeline (6) and is surrounded by the pressure regulating pipeline to form an annular cavity, the inner wall of the annular cavity is fixedly connected with a spiral guide plate (1504), the upper end of the cylinder body (1501) is fixedly communicated with a second water inlet joint (1502), the second water inlet joint (1502) is fixedly communicated with a second water inlet branch pipe (14), the lower end of the cylinder body (1501) is fixedly communicated with a second water outlet joint (1503), and the second water outlet joint (1503) is fixedly communicated with a second water outlet branch pipe (16).
  6. 6. The LNG fuel gas supply system of the oversized tank ship according to claim 4, wherein a first temperature sensor (25) is fixedly connected to a part of the exhaust pipeline (4) close to the outlet end of the air-temperature gasifier (3), the first temperature sensor (25) is used for detecting the temperature of natural gas gasified by the air-temperature gasifier (3), a second temperature sensor (26) is fixedly connected to a part of the pressure regulating pipeline (6) close to the outlet end of the water bath gasifier (5), the second temperature sensor (26) is used for detecting the temperature of natural gas before entering the primary pressure reducing valve (23), a third temperature sensor (29) is fixedly connected to a part of the pressure regulating pipeline (6) located at the outlet end of the secondary pressure reducing valve (24), and the third temperature sensor (29) is used for detecting the temperature of natural gas entering the engine (7).
  7. 7. The LNG fuel supply system of the oversized tank ship according to claim 1, further comprising a sealing box (20), wherein the liquid discharge pipeline (2) fixedly penetrates through the sealing box (20) and valve pieces and flange pieces arranged on the liquid discharge pipeline are all positioned in the sealing box (20), the air temperature gasifier (3) is fixedly arranged on the outer wall of the sealing box (20) through a mounting frame, the valve pieces and the flange pieces arranged on the exhaust pipeline (4) are all arranged in the sealing box (20), the water bath gasifier (5) is fixedly connected with the inner wall of the sealing box (20) through the mounting frame, the valve pieces and the flange pieces on the pressure regulating pipeline (6) are all arranged in the sealing box (20), and a dehumidifier (21) and a humidity sensor (22) are fixedly connected with the inner bottom wall of the sealing box (20).
  8. 8. The LNG fuel gas supply system of the oversized tank ship according to claim 7, wherein the front end of the sealing box (20) is hinged with a sealing door (2001), the inner wall of the sealing box (20) is fixedly connected with a pair of partition plates (27), an upper gas exhaust groove (2701) is formed in the upper portion of the partition plates (27), a lower gas exhaust groove (2702) is formed in the lower end of the partition plates, a mesh plate (28) is fixedly connected between the pair of partition plates (27), a heating row (18) is arranged below the mesh plate (28), the inlet end of the heating row (18) is communicated with a water inlet header pipe (9) through a third water inlet branch pipe (17), and the outlet end of the heating row (18) is communicated with a water return header pipe (12) through a third water outlet branch pipe (19).

Description

LNG fuel gas supply system of oversized tank ship Technical Field The invention relates to the field of engine fuel supply, in particular to an LNG fuel gas supply system of an oversized tank ship. Background LNG (liquefied natural gas) fuel is increasingly used in marine power systems as a clean, efficient energy source. The basic working principle of the prior ship LNG fuel gas supply system is that the low-temperature liquid LNG is heated and gasified by the gasifier, and then is supplied to a ship engine after pressure regulation and voltage stabilization. The prior patent with publication number CN112412664B discloses a ship and LNG fuel gas supply system, through communicating the exhaust port of a pressure pump with the air pipe of a liquid storage tank and the inlet of an air storage tank respectively, a closed space is formed by the liquid storage tank, the pressure pump and the air storage tank, BOG gas is continuously accumulated in the limited space, and self-compression is realized by utilizing the pressure among the gases, so that the BOG gas obtains the pressure required by combustion under the condition of not increasing peripheral pressure equipment. The prior patent with publication number CN102840058B discloses a liquid storage and gas supply system for LNG fuel power ships, which comprises an LNG storage tank valve and a gas supply system valve, wherein the valve is arranged in a sealed box, the tail end of a gas supply pipeline in the box extends out of the wall of the box to be connected with a cabin, and an air inlet and outlet pipeline and a gas leakage monitoring module are arranged at the same time, so that the gas supply system is safely arranged in the cabin or a deck, and natural gas is discharged to an outside-cabin safety area through the air outlet pipeline when leakage occurs. The prior art discloses a technical scheme of continuously accumulating and compressing BOG gas in a limited space to meet the combustion air supply pressure, and a technical scheme of timely early warning and processing air leakage by utilizing a sealing box and an exhaust device, however, the prior art still has the defects that when low-temperature LNG is insufficiently gasified, downstream pipelines are easily frozen and blocked, equipment, valve members and flange members are damaged, and the stable operation of the equipment is affected. Disclosure of Invention The invention aims at solving the problem that the LNG gasification is insufficient to damage a downstream pipeline in the prior art by connecting the air-temperature gasifier and the water bath gasifier in series, and reducing the probability of valve element blocking and flange element tightness reduction by the sealing box and the dehumidifier. In order to solve the problems, the invention adopts the following technical scheme. The LNG fuel gas supply system of the oversized tank ship comprises a storage tank, wherein the storage tank is communicated with an air-temperature gasifier through a liquid discharge pipeline, the air-temperature gasifier is communicated with a water bath gasifier through an exhaust pipeline, and the water bath gasifier is communicated with a fuel gas inlet of an engine through a pressure regulating pipeline; The water bath gasifier comprises a shell, wherein a heat exchange tube assembly is arranged in the shell, the lower end of the heat exchange tube assembly is communicated with an outlet of an exhaust pipeline, the upper end of the heat exchange tube assembly is communicated with an inlet of a pressure regulating pipeline, the outer wall of the heat exchange tube assembly is fixedly connected with a plurality of heat exchange fins which are distributed linearly at equal intervals, the inner wall of the shell is fixedly connected with an electric heating tube, circulating water is filled in the shell, and the electric heating tube is used for heating the circulating water in the shell; The shell right-hand member fixedly communicates there is first water inlet joint, first water inlet joint fixedly communicates there is first water inlet branch pipe, first water inlet branch pipe right-hand member fixedly communicates there is the intake manifold, intake manifold right-hand member and the delivery port of cylinder liner fixedly communicate, the left end fixedly communicates there is first water outlet joint of shell, first water outlet joint left end fixedly communicates there is first water outlet branch pipe, first water outlet branch pipe left end fixedly communicates there is the return water house steward, return water house steward right-hand member and the intake end fixedly communicates of cylinder liner, fixedly connected with hot water circulating pump on the return water house steward, hot water circulating pump makes hot water circulation flow between cylinder liner and water bath gasifier. Further, the first water inlet joint and the first water outlet joint are symmetrically arranged on two si