CN114413161A - LNG holds storage tank entirely with pump well groove cold insulation system - Google Patents

Abstract

The invention relates to an LNG full-capacity storage tank with a pump well slot cold insulation system, which comprises: concrete cushion cap and inner tank, the lower extreme of inner tank is fixed on the concrete cushion cap, the inner tank includes the inner tank bottom plate, the concrete cushion cap with be provided with cold insulation pressure bearing layer between the inner tank bottom plate, be provided with the pump well collecting tank on the inner tank bottom plate for hold the pump well, be provided with elasticity cold insulation layer in the pump well collecting tank. According to the invention, the elastic cold insulation material is arranged around the liquid collecting tank of the pump well, and when the inner tank is precooled and contracted, the elastic cold insulation layer can be contracted, so that the deformation of the bottom plate of the inner tank is counteracted, and the displacement generated by the contraction of the inner tank is compensated, so that the integral cold insulation structure of the storage tank cannot be out of work due to larger deformation.

Description

LNG full-capacity storage tank with pump well tank cooling system

technical field

The invention relates to an LNG full-capacity storage tank with a pump well tank cooling system, belonging to the technical field of natural gas storage.

Background technique

In the LNG industry chain, LNG storage is a very important link. In addition to storing a large amount of LNG, LNG storage tanks also play a buffer role for stable gas supply, and are the most critical core equipment. With the increase of storage tank capacity, the construction cost of storage tank per unit volume shows a downward trend, and the scale effect is obvious. Tank BOG evaporation rate. In addition, with the development of LNG-related technologies and materials, as well as the construction planning of the country's overall natural gas storage infrastructure, the development of large-scale LNG storage tanks will be the main development trend of my country's LNG receiving station storage tank technology.

LNG storage tanks can increase the effective tank capacity by increasing the height. However, due to high seismic fortification requirements in some areas, there are height restrictions on storage tanks. The bottom of the conventional LNG storage tank is composed of 9% Ni steel plate, dry sand leveling layer, foam glass brick, concrete leveling layer, etc. Use cans.

SUMMARY OF THE INVENTION

In view of the above technical problems, the present invention provides an LNG full-capacity storage tank with a pump well tank cold insulation system. The storage tank is provided with elastic cold insulation materials (such as elastic felt, glass wool, etc.) around the pump well liquid collection tank. When pre-cooling shrinks, the elastic cold insulation layer can shrink, thereby offsetting the deformation of the bottom plate of the inner tank, so that the overall cold insulation structure of the storage tank will not fail due to large deformation.

To achieve the above object, the present invention adopts the following technical solutions:

An LNG full-capacity storage tank with a pump well tank cooling system, comprising:

A concrete bearing platform and an inner tank, the lower end of the inner tank is fixed on the concrete bearing platform, the inner tank includes an inner tank bottom plate, and a cold insulation pressure bearing layer is arranged between the concrete bearing platform and the inner tank bottom plate A pump well liquid collecting tank is arranged on the bottom plate of the inner tank for accommodating the pump well, and an elastic cold insulating layer is arranged in the pump well liquid collecting tank.

In the LNG full-capacity storage tank, preferably, the compression deformation rate of the elastic cold insulation layer is not less than 50%.

In the LNG full-capacity storage tank, preferably, the thickness of the elastic cold insulating layer is 100-200 mm on the bottom surface and 200-800 mm on the side surface.

In the LNG full-capacity storage tank, preferably, the elastic cold insulation layer is made of materials including elastic felt or glass wool.

In the LNG full-capacity storage tank, preferably, the cold-insulating pressure-bearing layer is a glass brick layer, and the glass brick layer is composed of foam glass bricks and pressure-resistant glass bricks.

In the LNG full-capacity storage tank, preferably, the pressure-resistant glass bricks are laid below and around the pump well sump, and the foamed glass bricks are laid on the periphery of the pressure-resistant glass bricks.

For the LNG full-capacity storage tank, preferably, the laying range of the pressure-resistant glass bricks is: taking the center point of the pump well liquid collecting tank as the center, and laying outward not less than 1800 mm.

In the LNG full-capacity storage tank, preferably, the pressure-bearing capacity of the pressure-resistant glass brick is an average value of not less than 2.4 MPa.

In the LNG full-capacity storage tank, preferably, a lining plate at the bottom of the storage tank is also provided between the cold-insulating pressure bearing layer and the concrete bearing platform.

In the LNG full-capacity storage tank, preferably, the pump well sump is at least one of a square, a circle, a regular polygon or an irregular shape.

The present invention has the following advantages due to taking the above technical solutions:

1. In the present invention, the lower part of the pump well of the inner tank is provided in the form of a sump, and the pump well can go deep into the sump. The height of the pump well will be lower than the height of the inner tank bottom plate in the center of the storage tank. Under the condition that the NPSH of the pump well remains unchanged, lowering the minimum design liquid level of the storage tank can reduce the height of the inner and outer tanks of the storage tank. .

2. Under the condition that the overall height of the storage tank of the present invention remains unchanged, the net volume of the storage tank can be increased by lowering the minimum design liquid level of the storage tank, thereby improving the storage efficiency of the storage tank.

3. In the present invention, elastic cold insulation materials (such as elastic felt, glass wool, etc.) are arranged around the liquid collecting tank of the pump well. When the inner tank is pre-cooled and shrunk, the elastic cold insulation layer can shrink, thereby offsetting the deformation of the bottom plate of the inner tank and compensating for the inner tank. The displacement caused by the shrinkage of the tank makes the overall cold insulation structure of the storage tank not fail due to large deformation.

4. In the present invention, the glass brick cold-insulating material around the liquid collecting tank of the pump well is made of pressure-bearing glass bricks. The load of the bottom plate of the inner tank is transferred to the glass brick cold-insulating material through the elastic cold-insulating material. The tank cold insulation material can work normally.

Description of drawings

1 is an LNG full-capacity storage tank with a pump well tank cold insulation system provided by an embodiment of the present invention;

The reference numbers in the figure are as follows:

1- pump well; 2- pump well collecting tank; 3- elastic cold insulation layer; 4- inner tank bottom plate; 5- foam glass brick; 6- pressure-resistant glass brick; 7- concrete bearing platform.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention are described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Unless otherwise defined, technical or scientific terms used in the present invention should have the ordinary meaning as understood by one of ordinary skill in the art to which the present invention belongs. The terms "first," "second," "third," "fourth," and similar terms used herein do not denote any order, quantity, or importance, but are merely used to distinguish the various components. "Comprises" or "comprising" and similar words mean that the elements or things appearing before the word encompass the elements or things recited after the word and their equivalents, but do not exclude other elements or things. Words like "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

As shown in FIG. 1 , the LNG full-capacity storage tank with the pump well tank cooling system provided by the present invention includes: a concrete bearing platform 7 and an inner tank, the lower end of the inner tank is fixed on the concrete bearing platform 7, and the inner tank includes an inner tank The bottom plate 4, the concrete bearing platform 7 and the inner tank bottom plate 4 are provided with a cold insulation pressure bearing layer, and the inner tank bottom plate 4 is provided with a pump well sump 2 for accommodating the pump well 1, and the pump well sump 2 is provided with Elastic cold insulation layer 3.

In a preferred embodiment of the present invention, the compression deformation rate of the elastic cold insulating layer 3 is 50%.

In a preferred embodiment of the present invention, the thickness of the elastic cold insulating layer 3 is: the bottom thickness is 150 mm, and the side thickness is 400 mm.

In a preferred embodiment of the present invention, the elastic cold insulation layer 3 is made of materials including elastic felt or glass wool.

In a preferred embodiment of the present invention, the cold insulation pressure bearing layer is a glass brick layer, and the glass brick layer is composed of foam glass bricks 5 and pressure-resistant glass bricks 6 .

In a preferred embodiment of the present invention, the pressure-resistant glass bricks 6 are laid under and around the pump well sump 2 , and the foam glass bricks 5 are laid on the periphery of the pressure-resistant glass bricks 6 .

In a preferred embodiment of the present invention, the laying range of the pressure-resistant glass bricks 6 is: taking the center point of the pump well sump 2 as the center, and laying 1800 mm outward.

In a preferred embodiment of the present invention, the pressure-bearing capacity of the pressure-resistant glass brick 6 is 2.4 MPa.

In a preferred embodiment of the present invention, a lining plate at the bottom of the storage tank is also provided between the cold insulation pressure bearing layer and the concrete bearing platform 7 .

In a preferred embodiment of the present invention, the pump well sump 2 is at least one of a square, a circle, a regular polygon or an irregular shape.

In the present invention, the tank capacity of the LNG full-capacity storage tank is 10,000 to 300,000 cubic meters, and the LNG full-capacity storage tank includes above-ground, semi-underground or underground full-capacity storage tanks; the depth of the pump well sump 2 is 0.5 to 1 meter, When the pump well sump 2 is circular, its diameter is 1 to 10 meters. When the pump well sump 2 is irregular in shape, its volume is 2 to 100 cubic meters. The number of pump wells 1 is 1 to 5; the thickness of the concrete bearing platform 7 is 1 to 3 meters.

The present invention also provides a specific implementation method of the LNG full-capacity storage tank with the pump well tank cooling system:

(1) For the construction of the concrete bearing platform 7, a groove is reserved at the bearing platform below the storage tank pump well 1, so that there is enough construction space for the subsequent construction of the liquid collecting groove 2 of the pump well.

(2) Construction of the lining plate at the bottom of the storage tank. The lining plate adopts a flat welding scheme and is laid along the upper surface of the concrete bearing platform 7, and the lining plate covers the groove of the concrete bearing platform 7.

(3) Construction of the glass brick cold insulation layer on the upper part of the concrete bearing platform 7, laying glass bricks in the groove of the concrete bearing platform 7, in and near the groove of the concrete bearing platform 7, use pressure-resistant glass bricks, pressure-resistant glass bricks and inner Foam glass bricks are used between the tank walls, and the glass bricks must be able to resist the shrinkage load of the inner tank.

(4) An elastic cold insulation layer (such as elastic felt, glass wool, etc.) is arranged on the inner bottom and side of the liquid collecting groove 2 of the pump well. According to relevant project experience, the pre-cooling shrinkage of the inner tank of the 160,000-square-meter LNG storage tank is about 100-150mm. The compression deformation of the elastic felt is about 50%.

(5) The construction of the inner tank bottom plate 4 of the storage tank (the inner tank bottom plate 4 is covered above the elastic cold insulation layer 3) is still in the form of flat plate welding. The bottom plate 4 of the inner tank is provided with a pump well liquid collecting groove 2 at the bottom of the pump well. By adopting the flat welding form, the inner tank wall plate 4 can still use the existing mature technology and materials, and the construction difficulty of the inner tank of the storage tank will not increase.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. The utility model provides a LNG holds storage tank entirely with pump well groove cold insulation system which characterized in that includes:

concrete cushion cap (7) and inner tank, the lower extreme of inner tank is fixed on the concrete cushion cap (7), the inner tank includes inner tank bottom plate (4), concrete cushion cap (7) with be provided with cold insulation pressure bearing layer between inner tank bottom plate (4), be provided with pump well collecting tank (2) on inner tank bottom plate (4) for hold pump well (1), be provided with elasticity cold insulation layer (3) in pump well collecting tank (2).

2. LNG tanlc tank according to claim 1, characterized in that the elastic cold-retention layer (3) has a compression set of not less than 50%.

3. LNG tanlc tank according to claim 1, characterized in that the thickness of the elastic cold insulation layer (3) is: the bottom surface is 100 mm-200 mm, and the side surface is 200-800 mm.

4. LNG tank according to claim 1, characterized in that the elastic cold insulation layer (3) is processed from a material comprising elastic felt or glass wool.

5. LNG full-capacity storage tank according to claim 1, characterized in that the cold-insulation pressure-bearing layer is a glass brick layer, which consists of foam glass bricks (5) and pressure-resistant glass bricks (6).

6. LNG tank as claimed in claim 5, characterized in that the pressure-resistant glass bricks (6) are laid under and around the pump well sump (2), and the foam glass bricks (5) are laid on the periphery of the pressure-resistant glass bricks (6).

7. The LNG tank as claimed in claim 6, wherein the pressure-resistant glass blocks (6) are laid in the following ranges: the central point of the pump well liquid collecting tank (2) is used as the center, and the thickness is not less than 1800 mm.

8. LNG full-capacity storage tank according to claim 5, characterized in that the pressure-bearing capacity of the pressure-resistant glass blocks (6) is not less than 2.4MPa on average.

9. LNG full-capacity storage tank according to claim 1, characterized in that a storage tank bottom lining is further arranged between the cold insulation pressure bearing layer and the concrete cap (7).

10. LNG tanlc according to claim 1, characterized in that the pump well sump (2) is at least one of square, circular, regular polygonal or irregular shaped.

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