CN209540491U - Underground LNG storage tank with thin cushion cap - Google Patents

Abstract

The utility model discloses a kind of underground LNG storage tanks with thin cushion cap.The underground LNG storage tank includes the LNG storage tank ontology on cushion cap；Cushion cap is set on a blinding layer；Drainage system is equipped in blinding layer；The lower part of blinding layer is equipped with water pressure monitoring system；Water-separating film is equipped between cushion cap and blinding layer；Drainage system includes several drainpipes or gutter in blinding layer；Drainpipe or gutter are connected by drinking-water pipe with suction pump, and suction pump is set to outside the LNG storage tank of underground.In the LNG storage tank normal use process of the utility model underground, the tank bottom hydraulic pressure of underground LNG storage tank described in the water pressure monitoring system meeting real-time monitoring starts the suction pump when hydraulic pressure is more than design value, underground water is discharged, i.e. the draining of realization underground LNG storage tank cushion cap lower part, precipitation.

Description

Underground LNG storage tank with thin cushion cap

Technical field

The utility model relates to a kind of underground LNG storage tanks with thin cushion cap, belong to liquefied natural gas transmission & distribution technology field.

Background technique

Liquefied natural gas (LNG) is the liquid hydrocarbon based on methane produced when being cooled to -162 DEG C under normal pressure by natural gas Mixture since the volume of liquefied natural gas is about its gas (20 DEG C, 101.325KPa) volume about 1/600, therefore is conducive to defeated It send and stores, with the progress of liquified natural gas carrier (LNGC) and storage tank manufacturing technology, liquefied natural gas is almost at present across sea The main method of ocean transport natural gas.

Since roc LNG receiving station in 2006 goes into operation, the longest service time of Chinese LNG storage tank is had reached 11 years. The quantity of country's Large LNG storage tank has reached more than 40 at present, and the accumulation import volume of LNG is more than 100,000,000 5 thousand ten thousand tons.According to The planning of National Energy Board, the year two thousand twenty natural gas consumption specific gravity will increase to 10%, and the year two thousand thirty natural gas consumption specific gravity will improve To 15%, in this context, domestic LNG receives terminal and enters the Fast Construction phase.

Foreign countries have built up multiple underground LNG storage tanks at present, and the country also has begun the technical research work of underground LNG storage tank Make.For stress performance, sunken tank has more advantage.Ground tank has better shock resistance and safety, by aerial object A possibility that body collides is small, and small, the features such as influence of leakage is small is influenced by wind load.Underground LNG storage tank is more suitable in antidetonation It is applied in more demanding region and the biggish LNG storage tank of tank appearance of setting up defences.

Underground LNG storage tank is compared with common ground LNG storage tank, also improved aspect in need.Ground tank is held at present Platform thickness is all especially big, according to investigation, more than general 160,000 side underground LNG storage tank cushion cap thickness, all in 7m or more.Super large body Product concrete higher cost in construction, and construction quality is difficult to ensure.Sunken tank cushion cap thickness is larger, most important reason It is exactly that ground tank needs to consider anti-floating, especially in the case where slack tank, buoyancy is very big.Since LNG storage tank is built in more Coastal area, therefore requirement of the underground LNG storage tank for anti-floating is particularly significant.

Utility model content

The purpose of the utility model is to provide a kind of underground LNG storage tanks with thin cushion cap, store up relative to existing underground LNG Tank, the utility model underground LNG storage tank significantly reduce the thickness of cushion cap, solve buoyancy force of underground water to underground LNG storage tank It influences, the safety for reducing storage tank construction cost, ensure that Storage Tank Construction quality, improving structure.

The utility model reduces underground LNG storage tank cushion cap thickness by reducing tank bottom buoyancy force of underground water.

Underground LNG storage tank involved in the utility model includes full underground LNG storage tank, semi-underground LNG storage tank and console mode LNG storage tank.

Specifically, underground LNG storage tank provided by the utility model, including the LNG storage tank ontology being set on cushion cap；It is described Cushion cap is set on a blinding layer；

Drainage system is equipped in the blinding layer；

The lower part of the blinding layer is equipped with water pressure monitoring system.

In above-mentioned underground LNG storage tank, the blinding layer can be concrete material, and thickness is about 2m.

In above-mentioned underground LNG storage tank, water-separating film is equipped between the cushion cap and the blinding layer, to guarantee underground water It is discharged, the cushion cap of the underground LNG storage tank will not be had an impact by the drainage system.

In above-mentioned underground LNG storage tank, the drainage system include several drainpipes in the blinding layer or Gutter, the drainpipe can be used the mode for being embedded to the blinding layer, the gutter can in the blinding layer shape At (digging out)；

The drainpipe or the gutter are connected by drinking-water pipe with suction pump, and the suction pump is set to the underground Outside LNG storage tank.

In above-mentioned underground LNG storage tank, the drainpipe or gutter are arranged in a ring.

In above-mentioned underground LNG storage tank, the drainpipe or gutter are equipped with several discharge outlet, pass through the discharge outlet Underground water is guided into the drainpipe or the gutter, and then is discharged by the drinking-water pipe.

In above-mentioned underground LNG storage tank, several drinking-water pipes are set.

Underground water collecting pit can be set on the ground, store the underground water of extraction, and can utilize to underground water.

The utility model underground LNG storage tank can be installed by the following method:

1) water pressure monitoring system is set on stratum；

2) blinding layer is covered in the water pressure monitoring system, while drainage system is set in the blinding layer；

3) cushion cap and LNG storage tank ontology are set gradually on the blinding layer.

In the LNG storage tank normal use process of the utility model underground, described in the water pressure monitoring system meeting real-time monitoring The tank bottom hydraulic pressure of lower LNG storage tank starts the suction pump, underground water is discharged when hydraulic pressure is more than design value, i.e. realization underground The draining of LNG storage tank cushion cap lower part, precipitation.

The utility model has the following beneficial effects:

(1) improve the cushion cap thickness of underground LNG full-capacity tank；

(2) influence of the buoyancy force of underground water to LNG storage tank cushion cap is reduced；

(3) underground LNG storage tank construction cost is reduced；

(4) guarantee bearing platform construction quality；

(5) safety of structure is improved.

Detailed description of the invention

Fig. 1 is the schematic diagram of the utility model underground LNG storage tank (including drainage system).

Fig. 2 is the top view of drainage system in Fig. 1.

It is respectively marked in figure as follows:

1 discharge outlet, 2 drainpipes, 3 drinking-water pipes, 4 suction pumps, 5 water-separating films, 6 cushion caps, 7 blinding layers, 8 water pressure monitoring systems System.

Specific embodiment

The utility model is described further with reference to the accompanying drawing, but the utility model is not limited to following implementation Example.

As shown in Figure 1, being the utility model underground LNG storage tank, (in figure not including the LNG storage tank ontology on cushion cap 6 Mark), cushion cap 6 is set on blinding layer 7, and is equipped with water-separating film 5 between the two, prevents underground water from having an impact to cushion cap 6.Basis The lower part of bed course 7 is equipped with water pressure monitoring system 8, for monitoring the groundwater pressure of tank bottom.As shown in Fig. 2, being set in blinding layer 7 Have a drainpipe 2 of several annulars, drainpipe 2 passes through several discharge outlet being arranged thereon and is connected with drinking-water pipe 3, drinking-water pipe 3 and Suction pump 4 on ground is connected, so set, the underground water of tank bottom can be discharged.Underground water can be set on the ground Collecting pit stores the underground water of extraction, and can utilize to underground water.

The utility model underground LNG storage tank can be installed by the following method:

(1) before blinding layer 7 is constructed, water pressure monitoring system 8 is embedded in lower section.

(2) when blinding layer 7 is constructed, it is embedded to drainpipe 2, discharge outlet 1 is set on drainpipe.

(3) drainpipe 2 is connected to 7 outside of blinding layer, and is connected to ground suction pump 3 with drinking-water pipe 2.

(4) between blinding layer 7 and cushion cap 6, it is laid with water-separating film 5, guarantees that the water in blinding layer 7 will not infiltrate into cushion cap 6。

When underground LNG storage tank normal operating, the water pressure monitoring system 8 of tank bottom can detect tank bottom hydraulic pressure, when hydraulic pressure is more than When design value, start suction pump 4.Suction pump 4 can be extracted out 7 bottom underground water of tank foundation bed course by drinking-water pipe 2, be reduced Underground water liquid level reduces influence of the buoyancy force of underground water to storage tank.

Although the utility model/utility model embodiment is described, but it is to be understood that without departing substantially from Various modifications can be carried out under conditions of the utility model/utility model spirit and scope.In embodiments, used herein Word be illustrative and explanatory word, rather than word of limitation, i.e. the utility model extend to it is all functionally of equal value Structure, method and purposes.

Claims (6)

1. a kind of underground LNG storage tank, including the LNG storage tank ontology being set on cushion cap；It is characterized by: the cushion cap is set to a base On plinth bed course；

Drainage system is equipped in the blinding layer；

The lower part of the blinding layer is equipped with water pressure monitoring system.

2. underground LNG storage tank according to claim 1, it is characterised in that: set between the cushion cap and the blinding layer There is water-separating film.

3. underground LNG storage tank according to claim 1 or 2, it is characterised in that: the drainage system includes being set to the base Several drainpipes or gutter in plinth bed course；

The drainpipe or the gutter are connected by drinking-water pipe with suction pump, and the suction pump is set to the underground LNG Outside storage tank.

4. underground LNG storage tank according to claim 3, it is characterised in that: the drainpipe or gutter are arranged in a ring.

5. underground LNG storage tank according to claim 4, it is characterised in that: the drainpipe or gutter are equipped with several Discharge outlet.

6. underground LNG storage tank according to claim 4, it is characterised in that: several drinking-water pipes of setting.