RU2544624C1 - Liquefied natural gas storage facility - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: storage facility is designed for stationary storage of liquefied natural gas. The storage facility consists of an external reinforced-concrete container covered on the outer side with waterproof finish, in which an internal tank is installed on racks from material with low thermal conductivity and intended for storage of liquefied natural gas, and a piping system for filling and emptying of the internal tank with liquefied natural gas, with that, the external container is located below ground level. The internal tank is made from reinforced concrete; the external container has a detachable cover plate for installation and periodic inspection of the internal tank, and a gap between walls of the external container and the internal tank is filled with dry air; with that, the storage facility is provided with a system for supply and removal of dry air from inter-wall space, which consists of an air supply pipeline and an air removal pipeline, and racks from material with low thermal conductivity are made so that the air supplied from the dry air supply and removal system can be freely circulated between them.

EFFECT: reduction of cost and time for construction and installation work at creation of buried storage facilities.

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Description

The invention relates to the field of cryogenic engineering and can be used as stationary storage facilities for liquefied natural gas (LNG).

It is known about the prospects of using liquefied natural gas on various types of vehicles and in the energy supply of remote settlements (Kirillov N.G., Lazarev A.N. Liquefied natural gas: analysis of the world market and prospects for domestic production // Gazokhimiya Magazine, No. 6, 2011 - p. 23-29) - [1].

It is known about the economic efficiency of the creation and operation of buried LNG storages (Kirillov N.G., Lazarev A.N. Fundamentals of the technical and economic calculation of the cost of building underground storage of liquefied natural gas // Magazine “Gas filling complex + alternative fuel”, No. 4, 2012. - p. 3-9) - [2]. However, at present in Russia there is practically no experience in creating such LNG storage facilities.

A stationary storage facility for liquefied natural gas is known, consisting of an internal vessel made of corrosion-resistant alloys (for example, steel 12X18H10T), an external shell made of reinforced concrete and coated with waterproofing on the outside, and also a layer of thermal insulation located between the inner vessel and the external reinforced concrete shell (IP Usyukin. Installations, machines and apparatuses of cryogenic equipment. - M.: Light and food industry, 1982. - p. 275) - [3]. However, the inner shell of the tank is assembled from separate metal sheets at the installation site of the tank, which significantly increases the time and cost of construction. Moreover, this technology and technical solutions can only be used to create large vertical, cylindrical tanks for LNG storage.

The prototype of the claimed technical solution is a storage of liquefied natural gas, consisting of an external reinforced concrete container coated with waterproofing on the outside, in which, on supports made of a material with low thermal conductivity, an internal reservoir for storing liquefied natural gas, and a piping system for filling and emptying the inner reservoir with liquefied natural gas are installed while the storage is located below ground level (RF patent No. 2437027 from 12/20/2011) - [4]. However, the internal tank is made of a factory-ready tank, which makes it difficult to install, the need to transport the tank to the installation site and use additional thermal insulation.

The technical result that can be obtained by carrying out the invention is to reduce the cost and time of construction and installation work when creating buried storages, as well as to increase the terms of drainage-free storage of LNG, to increase the safety and reliability of operation of storages with cryogenic fuel.

To achieve this technical result, the storage of liquefied natural gas, consisting of an external reinforced concrete container, covered with waterproofing on the outside, in which, on supports made of a material with low thermal conductivity, an internal reservoir for storing liquefied natural gas, and a piping system for filling and emptying the inner reservoir with liquefied natural gas are installed while the external container is located below ground level, the storage is equipped with an internal tank made of iron it, the outer container has a removable roof for installation and periodic inspection of the inner tank, and the gap between the walls of the outer container and the inner tank is filled with dry air, while the storage is equipped with a system for supplying and removing dry air from the inter-wall space, consisting of an air supply pipe and a removal pipe air, and supports made of a material with low thermal conductivity are made in such a way that air supplied from the supply and removal system can freely circulate between them dry air.

Introduction to the storage of liquefied natural gas of an internal reservoir made of reinforced concrete, located on supports made of material with low thermal conductivity inside the outer reinforced concrete container, a removable roof of the outer container for installation and periodic inspection of the inner reservoir, the gap between the walls of the outer container and the inner reservoir filled with dry air, systems for supplying and removing dry air from the inter-wall space and placement of supports made of low heat material conductivity are such that air can freely circulate between them, which allows to obtain a new property consisting in reducing the cost and time of construction and installation works when creating buried storage facilities by creating an internal reservoir of reinforced concrete at the construction site of the storage facility, increasing the duration of LNG drainage-free storage for through the manufacture of an inner tank made of reinforced concrete, which allows you to keep high pressure inside the tank, as well as to increase the safety and reliability of the ex luatatsii storage cryogenic fuel by supplying dry air into the space between the walls for ventilation and its exclusion of soil freezing around the outside of the container, applying a removable roof outer container for periodic inspection of the inner container.

The drawing shows a storage of liquefied natural gas.

The liquefied natural gas storage consists of a reinforced concrete container 1, in which, on supports 2 of a material with low thermal conductivity (for example, foam concrete), an internal tank for storing liquefied natural gas 3 is installed. The gap 4 between the tank 3 and the inner walls of the container 1 is filled with dry air. A reinforced concrete container 1 is provided in the upper part with a removable roof 5 for installing and periodically inspecting the inner tank 3. To supply dry air to the gap 4, a system for supplying and removing dry air from the inter-wall space is provided, consisting of an air supply pipe 6 and an air removal pipe 7.

For filling and emptying the inner tank 3 with liquefied natural gas, a filling and emptying system 8 is provided with pipelines and shut-off and control valves.

Storage liquefied natural gas operates as follows.

The boiling point of LNG is about 111 K. In view of this, to exclude heat influx to LNG and increase the duration of its drainage-free storage, the tank 3 is made of reinforced concrete and installed in container 1 on supports 2 made of materials with low thermal conductivity. The gap 4 between the tank 3 and the inner walls of the container 1 is filled with dry air using the air supply pipe 6. Dry air passes through the gap 4 (interwall space) and between the supports 2, vents the interwall space 4 and is removed through the pipeline 7.

For mounting the inner tank 3 and its periodic inspection, the outer container 1 has a removable roof 5.

For filling and emptying the inner tank 3 with liquefied natural gas, a filling and emptying system 8 is provided with pipelines and shut-off and control valves.

Information sources

1. Kirillov N.G., Lazarev A.N. Liquefied natural gas: analysis of the global market and prospects for domestic production // Gazokhimiya Magazine, No. 6, 2011 - pp. 23-29.

2. Kirillov N.G., Lazarev A.N. The fundamentals of the technical and economic calculation of the cost of building underground storage of liquefied natural gas // Magazine "Gas filling complex + alternative fuel", No. 4, 2012. - pp. 3-9.

3. Usyukin I.P. Installations, machines and apparatuses of cryogenic equipment. - M.: Light and food industry, 1982. - p. 275.

4. RF patent No. 2437027 dated 12/20/2011 - the prototype.

Claims (1)

A liquefied natural gas storage facility, consisting of an external reinforced concrete container covered with waterproofing on the outside, in which an internal tank for storing liquefied natural gas, and a piping system for filling and emptying the internal tank with liquefied natural gas, is installed on supports made of material with low thermal conductivity, while the external container located below ground level, characterized in that the inner tank is made of reinforced concrete, the outer container has a removable roof for mounting same and periodic inspection of the inner tank, and the gap between the walls of the outer container and the inner tank is filled with dry air, while the storage is equipped with a system for supplying and removing dry air from the inter-wall space, consisting of an air supply pipe and an air removal pipe, and a stand made of low-material thermal conductivity is made in such a way that air supplied from the dry air supply and removal system can freely circulate between them.

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