CN214119693U

CN214119693U - LNG single fuel dual-redundancy gas supply system

Info

Publication number: CN214119693U
Application number: CN202022746327.7U
Authority: CN
Inventors: 石磊
Original assignee: Yangzhou Huafang Marine Equipment Co ltd
Current assignee: Yangzhou Huafang Marine Equipment Co ltd
Priority date: 2020-11-25
Filing date: 2020-11-25
Publication date: 2021-09-03
Anticipated expiration: 2030-11-25

Abstract

The utility model discloses a two redundant gas supply systems of LNG single fuel. The LNG single-fuel dual-redundancy gas supply system comprises an LNG supply station, wherein the LNG supply station is connected with an LNG storage tank through an LNG conveying pipe, the LNG storage tank is connected with a port gasification heater through a port LNG conveying pipe, a port LNG pressure pipe is connected between the port gasification heater and the port LNG conveying pipe, the port gasification heater is provided with a port BOG pressure pipe used for improving the internal pressure of the LNG storage tank, the port gasification heater is connected with a port host through a port gas supply pipe, the LNG storage tank is connected with a starboard gasification heater through a starboard LNG conveying pipe, a starboard LNG pressure pipe is connected between the starboard gasification heater and the starboard LNG conveying pipe, the starboard gasification heater is provided with a starboard BOG pressure pipe used for improving the internal pressure of the LNG storage tank, and the starboard gasification heater is connected with a starboard host through a starboard gas supply pipe. The utility model provides a prior art cost higher, equipment size is big, the system does not have the redundant poor problem of reliability that sets up.

Description

LNG single fuel dual-redundancy gas supply system

Technical Field

The utility model relates to a shipbuilding field especially relates to a two redundant gas supply systems of LNG single fuel.

Background

With the increasing shortage of petroleum resources, the rising price of petroleum and the gradual enhancement of the environmental awareness of human beings, low carbon, energy conservation and environmental protection become the subjects of the current ship technical progress. Efforts are being made to find desirable solutions from various aspects, such as more rational ship construction, cleaner fuels, more efficient power propulsion systems, etc. Wherein the CO can be reduced by 10 to 20 percent by using Liquefied Natural Gas (LNG) as fuel₂The emission, 90% of the emission of nitrogen oxides, 100% of the emission of sulfides and particulate matters, and the emission taking LNG as fuel can completely meet the Tier III standard of the International maritime organization, so that more and more brand new designs of ships based on gas fuel appear in the market.

The existing LNG single fuel gas supply system mainly comprises: 1. a two-tank system: the system adopts two completely independent gas supply systems, each independent gas supply system supplies gas for a host, and each gas supply system comprises a fuel tank, a gas tank connecting position, a self-pressurizing device, an LNG vaporizer and an LNG heater; the two systems share one ethylene glycol heating medium circulating device, one monitoring control box, one safety control box and one fuel supply station. The system is heavy, large in size, high in cost, and cannot meet the full dual redundancy configuration required by the latest specification. 2. Single tank system: the system has two sets of completely independent pipeline devices, but the two sets of completely independent pipeline devices share one LNG fuel tank, two ends of the fuel tank are respectively provided with a gas tank connecting position, and one pipeline device is arranged in each gas tank connecting position. Each set of pipeline device comprises a self-pressurizing device, an LNG vaporizer and an LNG heater, the heating medium uses high-temperature cooling water of the host, and the two sets of pipeline systems share a monitoring control box and a safety control box. The system is compact in arrangement and light in weight, but the number of containers is large, the number of storage tank openings is large, leakage risks are increased, the cost is high, and the full dual redundancy configuration which meets the latest specification requirements cannot be met.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a compact structure, with low costs, safe and reliable's two redundant gas supply systems of LNG single fuel to the not enough of prior art existence.

In order to achieve the above object, the utility model discloses the technical scheme that LNG single fuel dual redundant gas supply system adopted is:

an LNG single-fuel dual-redundancy gas supply system comprises an LNG supply station, wherein the LNG supply station is connected with an LNG storage tank through an LNG conveying pipe, the LNG storage tank is connected with a port gasification heater through a port LNG conveying pipe, a port LNG pressure increasing pipe is connected between the port gasification heater and the port LNG conveying pipe, the port LNG conveying pipe and the port LNG pressure increasing pipe are used for conveying LNG for the port gasification heater, the port gasification heater is provided with a port BOG pressure increasing pipe used for increasing the internal pressure of the LNG storage tank, the port gasification heater is connected with a port host through a port gas supply pipe, the LNG storage tank is connected with a starboard gasification heater through a starboard LNG conveying pipe, a starboard LNG pressure increasing pipe is connected between the starboard gasification heater and the starboard LNG conveying pipe, the starboard LNG conveying pipe and the starboard LNG pressure increasing pipe are used for conveying LNG for the starboard gasification heater, and the starboard gasification heater is provided with a starboard BOG pressure increasing pipe used for increasing the internal pressure of the LNG storage tank, the starboard gasification heater is connected with a starboard main engine through a starboard air supply pipe. LNG supply station passes through the LNG conveyer pipe and supplies LNG for the LNG storage tank, the LNG storage tank is provided with pressure range, the LNG storage tank passes through left, starboard LNG conveyer pipe is for left, starboard gasification heater carries LNG, LNG is through left, after the heat transfer of starboard gasification heater, partly gaseous through left, starboard BOG booster tube is for the pressurization of LNG storage tank, make LNG storage tank pressure remain throughout in the setting value scope, another is gaseous for left, the starboard host computer provides power air supply, need not extra pressurized container, make whole system size little, compact structure, the cost of manufacture is low, the risk of revealing because of the many brings of container quantity has been reduced simultaneously.

Preferably, a port BOG conveying pipe is arranged between the top of the LNG storage tank and the port gasification heater, and a starboard BOG conveying pipe is arranged between the top of the LNG storage tank and the starboard gasification heater. When the internal pressure of the LNG storage tank is too high, the LNG storage tank is supplied to a port host or a starboard host through a port BOG conveying pipe or a starboard BOG conveying pipe and a port gasification heater or a starboard gasification heater.

Preferably, an LNG depressurization pipe is connected between the top of the LNG storage tank and the LNG delivery pipe. In the LNG storage tank supply process, the LNG depressurization pipe is opened at any time to depressurize the LNG storage tank, and smooth supply is guaranteed.

Preferably, the port gasification heater exchanges heat through a port main engine cooling water system, and the starboard gasification heater exchanges heat through a starboard main engine cooling water system. The heat source generated by the host is fully utilized, and the energy is saved and the environment is protected.

Preferably, the LNG supply station, the LNG storage tank, the port gasification heater, and the starboard gasification heater are all connected to a nitrogen purging system.

Preferably, a stainless steel drip pan is arranged below the LNG supply station. Avoid cryogenic LNG fuel to leak to the boats and ships deck and lead to deck embrittlement.

Preferably, a port air valve unit is arranged between the port gasification heater and the port main engine, and a starboard air valve unit is arranged between the starboard gasification heater and the starboard main engine.

Compared with the prior art, the utility model, have following advantage:

1. LNG supply station passes through the LNG conveyer pipe and supplies LNG for the LNG storage tank, LNG step-down pipe opens at any time and steps down for the LNG storage tank, guarantee that the supply is smooth and easy to go on, LNG is through left, a starboard gasification heater heat transfer back gasification partly gaseous respectively for left and a starboard host computer provide fuel, another part is gaseous through left and a starboard BOG booster pipe gets back to the LNG storage tank, guarantee that LNG storage tank pressure remains throughout in the setting value within range, save extra pressure boost container, make entire system size little, moreover, the steam generator is compact in structure, the cost is reduced, the risk of revealing that the container quantity is many to bring has also been reduced simultaneously, safety and reliability.

2. When the internal pressure of the LNG storage tank is overlarge, the LNG storage tank is supplied to a port host or a starboard host through a port BOG conveying pipe or a starboard BOG conveying pipe and a port gasification heater or a starboard gasification heater, so that the pressure of the LNG storage tank is always kept within a set value range.

3. LNG depressurization pipe is opened at any time and is depressurized for the LNG storage tank, guarantees that the supply is smoothly gone on.

4. The hot water is used as a heat exchange medium, the heat source generated by the main machine is fully utilized, and the energy conservation and environmental protection are realized.

5. The container and each pipeline are purged by using nitrogen, so that the device is safe and reliable.

Drawings

Fig. 1 is a schematic diagram of an LNG single-fuel dual redundant gas supply system.

Wherein, 1-LNG supply station, 11-stainless steel drip pan, 12-first LNG delivery pipe, 13-port LNG delivery pipe, 14-starboard LNG delivery pipe, 15-second LNG delivery pipe, 16-BOG return pipe, 2-LNG storage tank, 21-relief valve release port, 22-thermometer, 23-monitoring system, 3-port gas supply system, 31-port gasification heater, 32-port host cooling water system, 33-port BOG delivery pipe, 34-port LNG return pipe, 35-port BOG return pipe, 36-port gas supply pipe, 37-port gas valve unit, 38-port host, 4-starboard gas supply system, 41-starboard gasification heater, 42-starboard host cooling water system, 43-starboard BOG delivery pipe, 44-starboard LNG return pipe, 45-starboard BOG return pipe, 46-starboard gas supply pipe, 47-starboard gas valve unit, 48-starboard host and 5-nitrogen purging system.

Detailed Description

The present invention will be further clarified by the following description in conjunction with the accompanying drawings, which are to be understood as illustrative only and not as limiting the scope of the invention, and modifications of the various equivalent forms of the invention by those skilled in the art after reading the present invention are within the scope defined by the appended claims.

As shown in figure 1, the LNG single-fuel dual-redundancy gas supply system comprises an LNG supply station 1, wherein a stainless steel drip pan 11 is arranged below the LNG supply station to prevent low-temperature LNG fuel from leaking to a deck of a ship to cause deck embrittlement, the LNG supply station is connected with an LNG storage tank 2 through an LNG delivery pipe 12, the top of the LNG storage tank is connected to the LNG delivery pipe through an LNG pressure reducing pipe, the LNG pressure reducing pipe is opened at any time to reduce the pressure of the LNG storage tank during the supply of the LNG storage tank to ensure smooth supply, a safety valve release port 21 is arranged at the center of the top of the LNG storage tank to prevent the pressure of the LNG storage tank from exceeding the design pressure, temperature sensors 22 are arranged at the top and the bottom of the LNG storage tank, a storage tank detection instrument 23 for detecting the pressure, the liquid level and the overflow condition is arranged on the LNG storage tank body, the bottom of the left side of the LNG storage tank is connected to the lower portion of a left side gasification heater 3 through a left side LNG delivery pipe 13, the other side of the lower portion of the left side gasification heater 3 is connected to the left side LNG delivery pipe, the left side LNG pressure charging pipe is connected to the LNG storage tank through a left side LNG conveying pipe, and avoids opening on the LNG storage tank additionally to reduce leakage risks.

The LNG supply station, the LNG storage tank, the port side gasification heater and the starboard side gasification heater are all connected with a nitrogen purging system 5.

The specific working process and principle of the LNG single-fuel dual-redundancy gas supply system are as follows: the LNG supply station conveys LNG to the LNG storage tank through the first LNG conveying pipe, the second LNG conveying pipe is standby, the LNG storage tank conveys LNG to the port board gasification heater through the port board LNG conveying pipe, BOG generated in the LNG storage tank is conveyed to the port board gasification heater through the port board BOG conveying pipe, the BOG and the LNG entering the port board gasification heater exchange heat through a port board host cooling water system, the BOG and the LNG enter the port board host through a port board air supply pipe and a port board air valve unit after pressurization gasification, the port board host provides power for the ship body and provides a heat source for the port board host cooling water system, the LNG generated in the port board gasification heater and the BOG generated in the port board LNG return pipe enter the port board gasification heater together to be gasified and pressurized to provide fuel for the port board host, and the circulation is used for improving the utilization rate of the LNG.

The starboard air supply system and the port air supply system have the same working principle.

The utility model discloses compact structure has reduced container quantity, and reduce cost has reduced and has revealed the risk, safe and reliable, and the LNG energy is utilized to the high efficiency, and the heat source that the make full use of host computer produced satisfies the complete dual redundant configuration of international maritime affairs organization Tier III standard and the latest standard requirement.

Claims

1. The utility model provides a two redundant gas supply systems of LNG single-fuel which characterized in that: the LNG storage tank is connected with a port gasification heater through a port LNG conveying pipe, a port LNG booster pipe is connected between the port gasification heater and the port LNG conveying pipe, the port LNG conveying pipe and the port LNG booster pipe jointly convey LNG for the port gasification heater, the port gasification heater is provided with a port BOG booster pipe used for improving the internal pressure of the LNG storage tank, the port gasification heater is connected with a port host through a port air supply pipe, the LNG storage tank is connected with a starboard gasification heater through a starboard LNG conveying pipe, a starboard LNG booster pipe is connected between the starboard gasification heater and the starboard LNG conveying pipe, the starboard LNG conveying pipe and the starboard LNG booster pipe jointly convey LNG for the starboard gasification heater, the starboard gasification heater is provided with a starboard BOG booster pipe used for improving the internal pressure of the LNG, and the starboard gasification heater is connected with a starboard host through a starboard air supply pipe.

2. An LNG single-fuel dual redundant gas supply system according to claim 1, characterized in that: be provided with the port board BOG conveyer pipe between LNG storage tank top and the port board gasification heater, be provided with the starboard BOG conveyer pipe between LNG storage tank top and the starboard gasification heater.

3. An LNG single-fuel dual redundant gas supply system according to claim 1, characterized in that: an LNG pressure reducing pipe is connected between the top of the LNG storage tank and the LNG conveying pipe.

4. An LNG single-fuel dual redundant gas supply system according to claim 1, characterized in that: and a BOG (boil off gas) return pipe is connected between the top of the LNG storage tank and the LNG supply station.

5. An LNG single-fuel dual redundant gas supply system according to claim 1, characterized in that: the port side gasification heater exchanges heat through a port side host cooling water system, and the starboard side gasification heater exchanges heat through a starboard side host cooling water system.

6. An LNG single-fuel dual redundant gas supply system according to claim 1, characterized in that: and the LNG supply station, the LNG storage tank, the port gasification heater and the starboard gasification heater are all connected with a nitrogen purging system.

7. An LNG single-fuel dual redundant gas supply system according to claim 1, characterized in that: and a stainless steel drip pan is arranged below the LNG supply station.

8. An LNG single-fuel dual redundant gas supply system according to claim 1, characterized in that: a port air valve unit is arranged between the port gasification heater and the port host, and a starboard air valve unit is arranged between the starboard gasification heater and the starboard host.