CN216923991U

CN216923991U - LNG vaporizing station

Info

Publication number: CN216923991U
Application number: CN202220406323.0U
Authority: CN
Inventors: 邵亚楠; 叶芬; 韩强; 孟明博
Original assignee: Anhui Changjiang Liquefied Natural Gas Co ltd; Huainan Mining Group Co Ltd
Current assignee: Anhui Changjiang Liquefied Natural Gas Co ltd; Huainan Mining Group Co Ltd
Priority date: 2022-02-25
Filing date: 2022-02-25
Publication date: 2022-07-08
Anticipated expiration: 2032-02-25

Abstract

The utility model discloses an LNG (liquefied natural gas) gasification station, which comprises a water taking forebay, a first water taking pump, a second water taking pump, a gasifier and a circulating water path, wherein the water taking forebay is arranged on the front of the LNG gasification station; the first water taking pump takes water from a water source and injects the water into the water taking forebay, and the second water taking pump takes water from the water taking forebay and delivers the water to the gasifier; the water outlet of the gasifier is connected with the inlet of a circulating water path, and the outlet of the circulating water path is connected with a water taking forebay. The utility model adopts the matching of the water taking forebay and the circulating water path, can realize the recycling of water used by the gasifier, reduce the water taking amount from the natural water body and reduce the gasification cost.

Description

LNG vaporizing station

Technical Field

The utility model relates to the technical field of LNG (liquefied natural gas) gasification, in particular to an LNG gasification station.

Background

The function of the receiving station gasification system is to heat and gasify the liquid LNG into natural gas. At present, the main process flow of the gasification system is that LNG from a storage tank is pressurized by a high-pressure pump and then enters a gasifier, and gasified natural gas (the temperature is more than or equal to 0 ℃) enters a gas transmission pipeline for outward transmission after metering and pressure regulating. The gasifiers used for large land receiving stations mainly comprise three types, namely an open rack gasifier (ORV), an intermediate medium gasifier (IFV) and a submerged combustion gasifier (SCV), and in addition, an air temperature gasifier (AAV) is also selected as a gasification device in the domestic and small-sized gasification stations in the foreign districts.

Open Rack Vaporizers (ORVs) are LNG vaporizers that use seawater or river water as the heating medium and are currently in widespread use worldwide. Because the river water is a natural heat source, the operation cost is lower, but the requirements on the quality of the river water are strict, the installation cost is high, and the investment is higher.

The intermediate medium gasifier (IFV) is a conventional shell and tube heat exchanger. Propane is generally used as an intermediate heating medium, river water is used as a heating source for gasification, the gasified propane steam is used for heating low-temperature LNG to be gasified into low-temperature natural gas in a tube pass, the propane steam is condensed at the same time, and the propane is recycled in an LNG gasification unit in a gas-liquid dynamic balance mode. The IFV can be made of titanium or stainless steel, so that the IFV has wider adaptation requirement on water quality.

A submerged combustion gasifier (SCV) is a water-bath gasifier that generally consumes about 1.5% of natural gas as fuel gas, and thus has a relatively high operating cost and produces a small amount of greenhouse gases such as nitrogen oxides. However, the SCV equipment has low investment cost, compact structure and no requirement of river water equipment. The method is generally applied to places where water is low in temperature, water pollutes or contains substances harmful to equipment and cannot be used, or is used for peak-shaving gasification by utilizing the characteristics of quick start/stop and low investment.

An air-heated vaporizer (AAV) is a vertical heat exchanger that vaporizes LNG by extracting heat from the atmosphere through heat exchange tubes. The ambient air vaporizer can use ambient air alone as a heat source, thereby completely preventing the emission of pollutants and the release of noise, and simultaneously, can collect condensed water and melted ice water as production or domestic water.

At present, when a vaporizer is configured in a coastal LNG receiving station, if seawater conditions are good, the configuration of ORV + SCV is generally adopted, because ORV operating cost is low and LNG treatment capacity is large, although SCV operating cost is relatively high, initial investment is low, operation is reliable, and peak regulation requirements can be met; if the silt content of the seawater is high or the chemical property of the seawater cannot meet the requirement, the ORV can be replaced by the IFV to form an IFV + SCV form except for considering treatment measures.

The various gasifiers described above can be used normally in environments with good water intake conditions, but if the amount of water taken cannot meet the normal gasification requirements, other ways of water intake at high cost may be required.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is how to take water from natural water body to the minimum degree and meet the LNG gasification requirement.

The utility model solves the technical problems through the following technical means:

an LNG vaporizing station comprises a water taking forebay, a first water taking pump (1), a second water taking pump (2), a vaporizer and a circulating water path (3); the first water taking pump (1) takes water from a water source place and injects the water into the water taking forebay, and the second water taking pump (2) takes water from the water taking forebay and sends the water to the gasifier; the water outlet of the gasifier is connected with the inlet of a circulating water path (3), and the outlet of the circulating water path (3) is connected with a water taking forebay.

The utility model adopts the matching of the water taking forebay and the circulating water path, can realize the recycling of water used by the gasifier, reduce the water taking amount from the natural water body and reduce the gasification cost.

Furthermore, the circulating water channel (3) is an open channel, so that low-temperature water discharged from the gasifier can be naturally heated, and the gasification requirement can be met.

Furthermore, a drainage channel (4) is also arranged on the circulating water path (3), and water in the circulating water path (3) is drained through the drainage pump through the drainage channel (4).

Further, the water intake forebay is adjacent to the water source.

Furthermore, a farmland is arranged around the circulating water path (3).

Furthermore, the length of the circulating waterway (3) meets the requirement that water discharged from the gasifier is naturally heated to the temperature required by LNG gasification.

Further, the gasifier is an IFV gasifier.

Further, the drainage ditch (4) is adjacent to a water source.

The utility model has the advantages that:

By adopting the open channel, the low-temperature water discharged from the gasifier can be naturally heated to meet the gasification requirement.

The water taking forebay is arranged at the periphery of a natural water body, so that the water taking length can be reduced, and the cost is reduced. The drainage channel is arranged, so that the problem that water in the open channel drags the periphery in rainy seasons is avoided.

Drawings

FIG. 1 is a schematic structural diagram of a gasification station according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The LNG vaporization station disclosed in this embodiment, as shown in fig. 1, includes a water intake forebay, a first water intake pump 1, a second water intake pump 2, a vaporizer, and a circulating water path 3; wherein, the first water taking pump 1 is arranged on the edge of the natural water body and pumps the natural water to the water taking forebay. The second water taking pump 2 is arranged between the water taking forebay and the gasifier, and pumps water in the water taking forebay out and supplies the water to the gasifier. In the embodiment, the gasifier is an IFV gasifier, the circulating water channel 3 is an open channel, and the length of the open channel is selected according to the local terrain, so that the length can meet the natural heating time. The water outlet of the gasifier is communicated with the inlet of the circulating water path 3, and the outlet of the circulating water path 3 is communicated with the water taking forebay, so that water circulation is formed. By adopting the open channel, the low-temperature water discharged from the gasifier can be naturally heated to the temperature meeting the use requirement of the gasifier, and the low-temperature water can be quickly heated to the temperature meeting the requirement in summer. The circulation water route 3 that this embodiment provided can significantly reduce the water intaking volume from the natural water, reduces the water intaking cost. In addition, in dry seasons, the circulating water path 3 can also supply irrigation water to peripheral farmlands, such as less rain in winter, cold water used by the gasifier can be used as agricultural irrigation water, so that the calling and the supplement of new water from other places are reduced, and if the temperature drop is large, the cold water is more beneficial to the growth of winter wheat. Or provide water to other user bodies for multiple purposes. Considering that the circulation water path 3 is easy to waterlog in rainy season, a waterlogging drainage channel 4 is arranged on one side of a neighbor natural water source, the waterlogging drainage channel 4 is communicated with the circulation water path 3, and if the water level of the open channel reaches a warning line, excess water is drained to rivers, lakes and seas through a waterlogging drainage pump.

In this embodiment, water intaking forebay and vaporizer arrange at the nature water periphery, are convenient for get water. The drainage channels are also arranged adjacent to the natural water body, so that drainage is facilitated.

During specific work, the first water taking pump 1 pumps natural water to the water taking forebay, the second water taking pump 2 pumps water in the water taking forebay to the IFV gasifier to heat LNG, then the LNG is discharged to the open channel, circulates for a circle around the open channel, and returns to the water taking forebay through natural heating; in summer, the water quantity of the open channel is sufficient, the water temperature is high, cold water (the temperature drop of the water temperature is limited within 2 ℃) after heat exchange of the IFV gasifier is discharged to the open channel, and if the water meets rainy seasons, redundant water can be discharged to natural water bodies through the waterlogging draining channel 4. When the water level of the open channel is low in winter and the water quantity of the open channel cannot meet the water consumption of the gasifier, the first water taking pump 1 is started to take water from the natural water body to the water taking forebay, and then the water is pumped to the gasifier through the pump for use by the IFV gasifier.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. An LNG vaporizing station is characterized by comprising a water taking forebay, a first water taking pump (1), a second water taking pump (2), a vaporizer and a circulating water path (3); the first water taking pump (1) takes water from a water source place and injects the water into the water taking forebay, and the second water taking pump (2) takes water from the water taking forebay and conveys the water to the gasifier; the water outlet of the gasifier is connected with the inlet of a circulating water path (3), and the outlet of the circulating water path (3) is connected with a water taking forebay.

2. LNG vaporizing station according to claim 1, characterized in that the circulating water circuit (3) is an open channel.

3. The LNG vaporizing station of claim 1 or 2, characterized in that the circulating water path (3) is further provided with a drainage channel (4), and water in the circulating water path (3) is discharged through the drainage channel (4) by a drainage pump.

4. The LNG vaporizer of claim 1 or 2, wherein the water intake forebay is adjacent to a source of water.

5. LNG vaporizing station according to claim 1 or 2, characterized in that a farmland is arranged around the circulating water circuit (3) along the way.

6. LNG vaporizing station according to claim 1 or 2, characterized in that the length of the circulating water circuit (3) is such that the water discharged from the vaporizer is naturally heated to the required temperature for LNG vaporization.

7. LNG vaporizer station according to claim 1 or 2, wherein the vaporizer is an IFV vaporizer.

8. LNG vaporizing station according to claim 3, characterized in that the drainage canal (4) is adjacent to a water source.