CN212361579U

CN212361579U - Combined supporting structure of low-temperature storage tank pump well pipe

Info

Publication number: CN212361579U
Application number: CN202020500659.4U
Authority: CN
Inventors: 卜凡; 梁宏斌; 宁远林; 曹岩
Original assignee: Hualu Engineering and Technology Co Ltd
Current assignee: Hualu Engineering and Technology Co Ltd
Priority date: 2020-04-08
Filing date: 2020-04-08
Publication date: 2021-01-15
Anticipated expiration: 2030-04-08

Abstract

The utility model discloses a combined supporting structure of a pump well pipe of a low-temperature storage tank, which is characterized in that the pump well pipe is fixed at a plurality of positions of a vault of the storage tank and an inner tank wall, and the gravity of a pump well is shared by a tank top and the inner tank wall; the dome around the pump well casing need not be locally reinforced; the radial position of the pump well pipe during installation considers the shrinkage of the inner tank in the working state in advance; the horizontal and axial movement of the pump well pipe is not limited by the suspended ceiling; the inner tank wall is provided with a limiting device, so that the pump well pipe is prevented from generating overlarge horizontal swing, and the gravity of the pump well pipe is borne. The structure can be used for fixing and supporting the pump well of the large-scale liquefied hydrocarbon and liquefied natural gas double-wall cryogenic storage tank. The structure can well control the horizontal vibration of the pump well pipe and can effectively reduce the stress of the pump well pipe in a working state.

Description

Combined supporting structure of low-temperature storage tank pump well pipe

Technical Field

The utility model relates to a liquefied hydrocarbon and liquefied natural gas double-walled low temperature storage tank, concretely relates to fixed and bearing structure of pump well of this type of low temperature storage tank.

Background

With the increasing attention on environmental issues in the world, the consumption of clean energy such as Liquefied hydrocarbons (hydrocarbons) and Liquefied Natural Gas (LNG) is increasing, and the demand for large cryogenic storage tanks for Liquefied hydrocarbons and LNG is also increasing. Common such cryogenic storage tanks include both bimetallic storage tanks and concrete storage tanks. The low-temperature storage tank consists of an inner tank, an outer tank and a cold insulation layer between the inner tank and the outer tank, wherein the inner tank is a steel storage tank, and the outer tank is a steel storage tank or a concrete tank.

The pump well of the low-temperature storage tank mainly bears the gravity load in a working state, the horizontal thrust generated by the cold shrinkage of the inner tank on a pump well pipe and the horizontal vibration generated by the pump well pipe when the immersed pump works. The gravitational load and the horizontal thrust of the inner tank cause axial stresses in the pump well, which may lead to its destruction. Horizontal vibration can lead to fatigue failure of the pump well tubing or to failure of the pump well tubing seal. If the pump well is positioned in the storage tank and is cracked or failed, the storage tank needs to be emptied firstly to be overhauled, and the operation of the storage tank is seriously influenced.

Therefore, the supporting structure of the pump well pipe is designed, the pump well pipe can not break due to overlarge axial stress, the horizontal vibration of the pump well pipe in a working state can be effectively reduced, and the fact that the low-temperature storage tank can run safely and stably is guaranteed, so that the supporting structure has important practical significance.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a joint bearing structure of low temperature storage tank pump well pipe. The structure can well control the horizontal vibration of the pump well pipe, effectively reduce the stress of the pump well pipe in a working state and ensure that the low-temperature storage tank can safely and stably run.

In order to achieve the above purpose, the technical scheme of the utility model is that: a combined supporting structure of a pump well pipe of a low-temperature storage tank comprises an inner tank, an immersed pump, a pump well pipe, a suspended ceiling sleeve, a suspended ceiling cover plate, a vault sleeve and a vault; the pump well is characterized in that a pump well pipe is fixed at a plurality of positions of a vault and the inner tank wall, and the gravity of the pump well is shared by the vault and the inner tank wall; the pump well pipe is fixed on the vault through a support ring and a vault sleeve; limiting devices are arranged on the inner tank wall at a plurality of positions to prevent the pump well pipe from generating excessive horizontal swing when the immersed pump works, and limiting base plates are arranged on the pump well pipes at the positions for reinforcement; a small part of weight of the pump well pipe is borne by the vault, a small part of weight of the pump well pipe is borne by the limiting device, and the gravity of the pump well pipe is borne dispersedly, so that the axial stress of the pump well pipe is reduced to a great extent, and the load of the pump well pipe on the vault is reduced.

A combined supporting structure of a pump well pipe of a low-temperature storage tank is characterized in that the pump well pipe, a vault sleeve, a vault and a supporting ring are connected in a welding mode.

A combined supporting structure of a pump well pipe of a low-temperature storage tank is characterized in that the pump well pipe is detachably connected with a ceiling cover plate and a limiting device.

A combined supporting structure of a pump well pipe of a low-temperature storage tank is characterized in that a reinforcing rib is arranged outside a vault sleeve.

The utility model provides a joint bearing structure of low temperature storage tank pump well pipe, characterized by does not weld between pump well pipe, furred ceiling apron and furred ceiling sleeve, and the furred ceiling apron falls on the furred ceiling sleeve under the action of gravity, therefore the axial displacement of pump well pipe does not receive the furred ceiling restriction.

A combined supporting structure of a pump well pipe of a low-temperature storage tank is characterized in that the difference value of the radiuses among the pump well pipe, a suspended ceiling sleeve and a straight cylinder section of a suspended ceiling cover plate is not less than the cold shrinkage of a suspended ceiling and is 30-120 mm, so that the horizontal displacement of the pump well pipe is not limited by the suspended ceiling.

A combined supporting structure for the pump well pipe of low-temp storage tank features that the radial distance between the top and bottom of pump well pipe is 30-120 mm, which is determined by the radius of internal tank, operating temp and linear expansion coefficient of internal tank material.

A combined supporting structure of a pump well pipe of a low-temperature storage tank is characterized in that a limiting device does not limit the movement of the pump well pipe in the vertical direction, the pump well pipe can freely move along the axial direction, and the pump well pipe cannot generate overlarge axial stress.

A combined supporting structure of a pump well pipe of a low-temperature storage tank is characterized in that a limiting device adopts an annular elastic limiting spring, and the limiting force on the pump well pipe can be effectively reduced.

The utility model relates to a joint bearing structure of low temperature storage tank pump well pipe can be used to the fixed of large-scale liquefied hydrocarbon and liquefied natural gas double-walled low temperature storage tank pump well and support. The structure can well control the horizontal vibration of the pump well pipe and can effectively reduce the stress of the pump well pipe in a working state.

Drawings

In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings required for the description of the embodiments or the prior art are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive changes.

FIG. 1 is a schematic view of a joint support structure for a cryogenic tank pump well tubing.

Fig. 2 is a top view of the spacing device.

Description of reference numerals: the device comprises an inner tank 1, an immersed pump 2, a limiting device 3, an elastic limiting spring 3-1, a limiting base plate 4, a pump well pipe 5, a ceiling sleeve 6, a ceiling cover plate 7, a vault sleeve 8, a vault sleeve reinforcing rib 8-1, a vault 9 and a support ring 10.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the scope protected by the present invention.

The present invention will be described in detail with reference to the accompanying drawings.

As shown in figure 1, the combined supporting structure of the pump well pipe of the cryogenic storage tank can be used for fixing and supporting a double-wall cryogenic storage tank pump well of large-scale liquefied hydrocarbon and liquefied natural gas. It is characterized in that the pump well pipe 5, the dome sleeve 8, the dome 9 and the support ring 10 are connected by welding. The pump well pipe 5 is detachably connected with the ceiling cover plate 7 and the limiting device 3.

The pump well casing 5 is fixed to the dome 9 by means of a support ring 10 and a dome sleeve 8, and a small part of the weight of the pump well casing 5 is taken up by the dome 9. The material of the pump well casing 5 and the support ring 10 should be stainless steel or other cryogenic steel, and the material of the dome sleeve 8 may be plain carbon steel (e.g. Q345R) in conformity with the dome 9. The thickness of support ring is 10 ~ 20mm usually, and the thickness of vault sleeve 8 is 10mm ~ 30mm usually.

The dome 9 bears less weight on the pump well pipe 5 and no additional reinforcement of the dome sleeve 8, the dome 9 and the support ring 10 is required. If the rigidity of the structure is increased, a reinforcing rib 8-1 can be arranged outside the dome sleeve 8. The material of the reinforcing ribs 8-1 should be the same as the dome sleeve 8, and the thickness thereof is usually 6mm to 16 mm. The reinforcing ribs 8-1 are usually not less than 4 pieces and are circumferentially and uniformly distributed.

The inner tank 1 can be cooled and contracted in a working state, the limiting device 3 at the lower part of the pump well pipe 5 can generate radial displacement along with the inner tank, and the displacement is considered when the pump well pipe 5 is installed so as to ensure that the pump well pipe 5 is close to a linear state in the working state and cannot generate obvious bending stress. The radial distance of the well pipes 5 at the dome 9 and the bottom fixing position of the tank should be determined according to the radius of the inner tank, the operating temperature and the linear expansion coefficient of the material of the inner tank, and is usually 30mm to 120 mm.

The pump well pipe 5, the ceiling cover plate 7 and the ceiling sleeve 6 are not welded, the ceiling cover plate 7 falls on the ceiling sleeve 6 under the action of gravity, and therefore the axial displacement of the pump well pipe is not limited by a ceiling. The radii of the straight sections of the pump well pipe 5, the ceiling sleeve 6 and the ceiling cover plate 7 should be sufficiently different to ensure that the horizontal displacement of the pump well pipe 5 is not limited by the ceiling. The ceiling cover 7 and the ceiling sleeve 6 should be made of stainless steel or other low temperature resistant materials. The thickness can be reduced as appropriate because of the small load applied to both, and is usually 4mm to 10 mm. The difference value of the radiuses of the straight cylinder sections of the pump well pipe 5, the ceiling sleeve 6 and the ceiling cover plate 7 is not less than the cold shrinkage of the ceiling, and is usually 30-120 mm.

As shown in fig. 2, the inner tank wall 1 is provided with a plurality of position-limiting devices 3 to prevent the pump well pipe 5 from generating excessive horizontal swing when the immersed pump 3 operates. The pump well pipe 5 at these positions should be reinforced by a limiting cushion plate 4. The limiting device 3 adopts an annular elastic limiting spring 3-1 (such as a spring with lower rigidity) and can effectively reduce the restraining force on the pump well pipe 5.

The limiting device 3 bears most of the gravity of the pump well pipe 5 in an elastic limiting mode. In this way, the gravity of the pump well pipe 5 is distributed and borne, the axial stress of the pump well pipe 5 is greatly reduced, and the load of the pump well pipe 5 on the dome 9 is reduced.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are all covered by the protection scope of the present invention.

Claims

1. A combined supporting structure of a pump well pipe of a low-temperature storage tank comprises an inner tank (1), an immersed pump (2), a pump well pipe (5), a suspended ceiling sleeve (6), a suspended ceiling cover plate (7), a vault sleeve (8) and a vault (9); the pump well is characterized in that the pump well pipe (5) is fixed at a plurality of positions of the vault (9) and the inner tank wall, and the gravity of the pump well is shared by the vault (9) and the inner tank wall; the pump well pipe (5) is fixed on the dome (9) through a support ring (10) and a dome sleeve (8); limiting devices (3) are arranged on the wall of the inner tank (1) at a plurality of positions, the pump well pipe (5) is prevented from generating excessive horizontal swing when the immersed pump (2) works, and a limiting base plate (4) is arranged at the position of the pump well pipe (5) provided with the limiting devices (3) for reinforcement.

2. A joint support structure for pump well pipes of cryogenic storage tanks according to claim 1, characterized in that the pump well pipes (5), the dome sleeve (8), the dome (9) and the support ring (10) are connected by welding.

3. The joint support structure of the pump well pipe of the cryogenic storage tank as claimed in claim 1, wherein the pump well pipe (5) is detachably connected with the ceiling cover plate (7) and the limiting device (3).

4. A joint support structure for well pipes of cryogenic storage tanks pumps according to claim 1, characterized in that outside the dome sleeve (8) there are arranged stiffeners (8-1).

5. A joint support structure for pump well pipes for cryogenic storage tanks according to claim 1, characterized in that the pump well pipes (5), the ceiling cover plate (7) and the ceiling sleeve (6) are not welded, the ceiling cover plate (7) falling under gravity onto the ceiling sleeve (6).

6. The joint support structure of the pump well pipe of the cryogenic storage tank according to claim 1, wherein the difference in radius between the straight sections of the pump well pipe (5), the ceiling sleeve (6) and the ceiling cover plate (7) is 30mm to 120 mm.

7. A combined support structure for pump well pipes for cryogenic storage tanks according to claim 1, characterized in that the radial distance of the pump well pipes (5) at the fixing locations of the dome (9) and the bottom of the tank is between 30mm and 120 mm.

8. A joint support structure for well pipes of cryogenic storage tanks pumps according to claim 1, characterized in that the stop means (3) are annular elastic stop springs (3-1).

9. A joint support structure for well pipes of cryogenic storage tanks pumps according to claim 4 wherein the reinforcing ribs (8-1) are not less than 4 pieces and are circumferentially and evenly distributed.