CN212618202U

CN212618202U - Steam-water circulating device of natural circulation of tower type fused salt photo-thermal steam generation system

Info

Publication number: CN212618202U
Application number: CN202021947265.XU
Authority: CN
Inventors: 江晶亮; 陈君; 张武玄; 顾磊
Original assignee: Shanghai Boiler Works Co Ltd
Current assignee: Shanghai Boiler Works Co Ltd
Priority date: 2020-09-08
Filing date: 2020-09-08
Publication date: 2021-02-26
Anticipated expiration: 2030-09-08

Abstract

The utility model provides a tower fused salt light and heat steam generation system natural circulation's soda circulating device, including the steam pocket, the export and the entry of steam pocket are linked together with the evaporimeter through downcomer and tedge respectively, its characterized in that, evaporimeter adopt vertical structure, including the shell body and locate the heat transfer casing of shell body below, wherein: an outer tube plate is arranged at the bottom of the outer shell, the outer tube plate and the heat exchange shell jointly enclose a heat exchange cavity positioned in the heat exchange shell, and fused salt is arranged in the heat exchange cavity; also comprises an inner sleeve and an outer sleeve. The heat exchange tube of the utility model adopts a sleeve structure, the heat exchange tube can expand freely, and the failure of the welding seam of the tube plate is avoided; the high-temperature molten salt inlet is directly contacted with the heat exchange tube for heat exchange, the molten salt temperature at the outlet is low, and the thermal stress of the tube plate is low; under the same condition, the utility model relates to a soda circulation technology circulation multiplying power is high, easily realizes the natural circulation, because steam generation system natural circulation, consequently the utility model discloses energy loss is low, stability is high, investment cost is low.

Description

Steam-water circulating device of natural circulation of tower type fused salt photo-thermal steam generation system

Technical Field

The utility model relates to a soda circulating device suitable for tower fused salt light and heat project steam generation system natural circulation.

Background

With the rapid development of renewable energy sources, tower type solar thermal power generation projects are being vigorously constructed. In a steam generation system adopted in the existing tower type solar thermal power generation project, the steam-water circulation of an evaporator and a steam drum mostly adopts a forced circulation technology. The evaporator adopting the forced circulation technology has large energy consumption and high maintenance cost. A few evaporators adopt a natural circulation technology, and the evaporators adopt a structural form of a horizontal U-shaped tube heat exchanger, so that the problems of low circulation multiplying power, long driving time and the like exist.

Disclosure of Invention

The utility model aims at: so that natural circulation of the steam-water circulation is realized and higher circulation multiplying power is ensured.

In order to achieve the above object, the technical scheme of the utility model a tower fused salt light and heat steam generation system natural circulation's soda circulating device is provided, including the steam pocket, the export and the entry of steam pocket are linked together with the evaporimeter through downcomer and tedge respectively, and its characterized in that, evaporimeter adopt vertical structure, include the shell body and locate the heat transfer casing of shell body below, wherein: an outer tube plate is arranged at the bottom of the outer shell, the outer tube plate and the heat exchange shell jointly enclose a heat exchange cavity positioned in the heat exchange shell, and fused salt is arranged in the heat exchange cavity;

an inner shell is arranged in the outer shell, the inner shell and the outer tube plate jointly enclose an inner cavity positioned in the inner shell, and the inner cavity is communicated with the downcomer; an outer cavity is arranged between the inner shell and the outer shell and is communicated with the ascending pipe;

the steam-water circulating device also comprises a plurality of inner pipes, the top end of each inner pipe is fixed on an inner pipe plate in the inner cavity, the bottom end of each inner pipe is a free end and is positioned in the heat exchange cavity, the inner cavity is divided into an upper cavity and a lower cavity by the inner pipe plate, the inner pipes are communicated with the upper cavity, and undersaturated water enters the inner pipes after flowing out of a steam pocket through a downcomer and then enters the upper cavity; every inner tube overcoat is equipped with an outer tube that is located the heat transfer cavity, the top of outer tube is fixed on the outer tube plate, the bottom of outer tube is the free end, fused salt and outer tube direct contact in the heat transfer cavity, form annular space between outer tube and the corresponding inner tube, the annular space is linked together with the lower part cavity of interior cavity, only be linked together through the through-hole of locating on the interior casing between lower part cavity and the outer cavity, after the undersaturated water that gets into the inner tube reached the inner tube bottom, carry out the heat transfer through annular space and fused salt, the undersaturated water is heated and is the mixture of saturated steam and saturated water soda upwards through the annular space and get into the lower part cavity, the rethread through-hole gets into outer cavity, return the steam.

Preferably, N downcomers and M risers are arranged, wherein N is more than or equal to 1, and M is more than or equal to 1; the N downcomers connected with the steam drum are converged into K pipe openings through a downcomer header to be communicated with the evaporator, and K is more than or equal to 1; m ascending pipes connected with the steam drum are converged into J pipe openings through an ascending pipe header to be communicated with the evaporator, and J is more than or equal to 1.

Preferably, a settling structure for collecting impurities contained in the undersaturated water is arranged in the downcomer header; and a sewage discharge structure for discharging impurities collected by the sedimentation type structure is also arranged on the downcomer header.

Preferably, the inner tube has a single-layer structure or a multi-layer structure of at least two layers.

Preferably, the inner tube is supported on the inner wall of the outer tube by a resilient support structure provided on the outer wall of the inner tube.

Preferably, the inner pipe and the inner pipe plate are expanded and connected by an inner sleeve.

The utility model has the advantages of as follows:

1) the heat exchange tube of the utility model adopts a sleeve structure, the heat exchange tube can expand freely, and the failure of the welding seam of the tube plate is avoided;

2) the high-temperature molten salt inlet is directly contacted with the heat exchange tube for heat exchange, the molten salt temperature at the outlet is low, and the thermal stress of the tube plate is low;

3) the inner pipe plate for fixing the inner pipe is made of thin materials because the pressure of inlet water is close to that of outlet steam, the inner pipe and the pipe plate shell are in inner sleeve expansion joint, and the inner pipe can be flexibly disassembled and is convenient to overhaul.

4) Under the same condition, the utility model relates to a soda circulation technology circulation multiplying power is high, easily realizes the natural circulation, because steam generation system natural circulation, consequently the utility model discloses energy loss is low, stability is high, investment cost is low.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is an enlarged partial schematic view of FIG. 1;

FIG. 3 is a schematic view of a downcomer header section;

fig. 4 is a schematic view of the elastic support of the inner and outer tubes.

Detailed Description

The present invention will be further described with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes and modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and these equivalents also fall within the scope of the appended claims.

As shown in figure 1, the utility model provides a tower fused salt light and heat steam generation system natural circulation's soda circulating device, including steam pocket 1, the export and the entry of steam pocket 1 are linked together with evaporimeter 14 through downcomer 2 and tedge 8 respectively. Referring to fig. 3, in the present invention, a plurality of downcomers 2 and risers 8 can be assembled into 1 or more openings to be connected to the evaporator through respective downcomer headers 12 and riser headers. The utility model discloses in, be provided with in downcomer header 12 and be used for collecting the formula structure that subsides of the less saturated water of play steam pocket 1 impurity that contains, corresponding still is provided with on downcomer header 12 and is used for subsiding the impurity exhaust blowdown structure 15 that the formula structure was collected.

The utility model discloses in, the evaporimeter adopts vertical structure, and the evaporimeter shell side can adopt multiple baffling pattern, including single bow, double bow, pattern such as disc ring, including shell body 9 and the heat transfer casing 10 of locating shell body 9 below. The outer tube plate 11 positioned at the bottom of the outer shell 9 and the heat exchange shell 10 jointly enclose a heat exchange cavity positioned in the heat exchange shell 10, and molten salt is arranged in the heat exchange cavity.

An inner shell 3 is arranged in the outer shell 9, the inner shell 3 and the outer tube plate 11 jointly enclose an inner cavity positioned in the inner shell 3, and the inner cavity is communicated with the down pipe 2. An outer cavity is arranged between the inner shell 3 and the outer shell 9 and is communicated with the ascending pipe 8.

Referring to fig. 2, an inner pipe plate 16 is provided in the inner housing 3, and the inner chamber is divided into an upper chamber and a lower chamber by the inner pipe plate 16. The utility model provides a steam-water circulating device still includes many inner tubes 5, and inner tube 5 adopts single-layer structure or at least two-layer multilayer structure. The top end of each inner tube 5 is fixed on an inner tube plate 16 in the inner cavity, the inner tubes 5 and the inner tube plates 16 are in inner sleeve expansion joint, and the bottom end of each inner tube 5 is a free end and is positioned in the heat exchange cavity. The inner pipe 5 is communicated with the upper cavity, and the undersaturated water enters the upper cavity through the downcomer 2 after exiting the steam pocket 1 and then enters the inner pipe 5.

Every 5 overcoat of inner tube are equipped with an outer tube 6 that is located the heat transfer cavity, and inner tube 5 supports on 6 inner walls of outer tube as shown in fig. 4 through the elastic support structure who locates the outer wall of inner tube 5, and in this embodiment, elastic support structure adopts the arc sheetmetal 13 that sets up on 6 inner walls of outer tube, and the arc sheetmetal 13 that is located the same height evenly arranges along circumference, guarantees the elastic fixation between the interior outer tube. The top of outer tube 6 is fixed on outer tube plate 11, and the bottom of outer tube 6 is the free end, fused salt and outer tube direct contact in the heat transfer cavity. An annular space is formed between the outer pipe 6 and the corresponding inner pipe 5, the annular space is communicated with the lower cavity of the inner cavity, and the lower cavity is communicated with the outer cavity only through a through hole 7 arranged on the inner shell 3. After the undersaturated water entering the inner pipe 5 reaches the bottom of the inner pipe 5, the heat exchange is carried out between the annular space and the fused salt, the undersaturated water is heated into a mixture of saturated steam and saturated water vapor and water, then the mixture upwards enters the lower cavity of the inner cavity through the annular space, then enters the outer cavity through the through hole 7, and finally returns to the steam pocket 1 through the ascending pipe 8 from the top of the outer shell 9.

Claims

1. The utility model provides a tower fused salt light and heat steam generation system natural circulation's soda circulating device, includes the steam pocket, and the export and the entry of steam pocket are linked together with the evaporimeter through downcomer and tedge respectively, and its characterized in that, evaporimeter adopt vertical structure, include the shell body and locate the heat transfer casing of shell body below, wherein: an outer tube plate is arranged at the bottom of the outer shell, the outer tube plate and the heat exchange shell jointly enclose a heat exchange cavity positioned in the heat exchange shell, and fused salt is arranged in the heat exchange cavity;

2. The natural circulation steam-water circulation device of the tower type molten salt photo-thermal steam generation system according to claim 1, characterized in that N downcomers and M risers are provided, N is more than or equal to 1, and M is more than or equal to 1; the N downcomers connected with the steam drum are converged into K pipe openings through a downcomer header to be communicated with the evaporator, and K is more than or equal to 1; m ascending pipes connected with the steam drum are converged into J pipe openings through an ascending pipe header to be communicated with the evaporator, and J is more than or equal to 1.

3. The natural circulation steam-water circulation device of the tower type molten salt photo-thermal steam generation system according to claim 2, characterized in that a settling structure for collecting impurities contained in the undersaturated water is arranged in the downcomer header; and a sewage discharge structure for discharging impurities collected by the sedimentation type structure is also arranged on the downcomer header.

4. The natural circulation steam-water circulation device of the tower type molten salt photo-thermal steam generation system according to claim 1, wherein the inner pipe is of a single-layer structure or a multi-layer structure with at least two layers.

5. The natural circulation steam-water circulation device of the tower type molten salt photo-thermal steam generation system according to claim 1, wherein the inner pipe is supported on the inner wall of the outer pipe through an elastic support structure arranged on the outer wall of the inner pipe.

6. The natural circulation steam-water circulation device of the tower type molten salt photo-thermal steam generation system according to claim 1, wherein the inner pipe and the inner pipe plate are in inner sleeve expansion joint.