CN213020376U

CN213020376U - Tower type photo-thermal power generation heat absorber assembly for central focusing

Info

Publication number: CN213020376U
Application number: CN202021883453.0U
Authority: CN
Inventors: 宋士雄; 陈煜达
Original assignee: Jiangsu Xinchen Solar Thermal Technology Co ltd
Current assignee: Jiangsu Xinchen Solar Thermal Technology Co ltd
Priority date: 2020-09-02
Filing date: 2020-09-02
Publication date: 2021-04-20
Anticipated expiration: 2030-09-02

Abstract

The utility model relates to a tower solar-thermal power generation heat absorber subassembly for center focus, including a plurality of flat pipes of heat absorption and header, be used for absorbing the energy in the ring shape radiation area of center focus. The utility model discloses use flat pipe and its torsion feature, make each position horizontal heating area unchangeable to through increase inclination downwards's method, increase the axial length of flat pipe lower part heating surface. By combining the three characteristics, the heat absorption area is larger on the annular heated area and is closer to the inner edge of the ring, so that the heat absorption area can adapt to the radiation distribution characteristic of central focusing. The utility model has the advantages of simple structure, low cost, uniform heating, few types of parts, convenient part replacement, adaptability to the radiation characteristic of central focusing and high operation safety; the component can effectively ensure the safe and stable operation of the heat absorber of the photothermal power station and has higher economical efficiency.

Description

Tower type photo-thermal power generation heat absorber assembly for central focusing

Technical Field

The utility model belongs to the solar photothermal power field, concretely relates to tower solar thermal power generation heat absorber subassembly for center focusing.

Background

The tower type photo-thermal power generation technology is verified on the commercial projects at home and abroad, and has the advantages of high heat collection efficiency and large reduction space of the power consumption cost. The tower type heat absorber is one of core equipment of a power station, solar energy is converted into heat energy of a heat transfer medium through the heat absorber, and the heat transfer medium exchanges heat with water to generate steam to drive a steam turbine to generate electricity. One of the tower power generation technologies adopts a central focusing light-gathering mode, and the central area of the tower power generation technology adopts an open type heat absorber, so that in order to further reduce the cost, the radiation of the annular ring part at the periphery of the open type heat absorber needs to be fully utilized. The ratio of the internal radiation intensity to the external radiation intensity of the part of the torus is usually more than 10, and the ratio of the internal circumference length to the external circumference length is less than 0.5. The common circular tube rows have the same section length, cannot completely cover the whole radiation surface, and the local radiation intensity exceeds the tolerance range of common materials.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: aiming at the defects and the defects of the existing circular tube bank, the tower type photo-thermal power generation heat absorber assembly for center focusing is provided to improve the economic benefit and the safety of the tower type heat absorber.

A heat absorber subassembly for tower solar-thermal power generation can cover whole ring radiating surface completely, and the radiation intensity does not surpass the tolerance range of material commonly used to make spare part standardization, reduce the heat absorber cost. In order to achieve the above object, the utility model adopts the following technical scheme:

a tower type photo-thermal power generation heat absorber component for central focusing is composed of a plurality of heat absorption flat tubes and a header, wherein two ends of each heat absorption flat tube are welded on the header in a crossed manner; the single heat absorption flat pipe is twisted by 60-90 degrees, the vertical projection of the single heat absorption flat pipe is trapezoidal, the ratio of the upper side length to the lower side length of the trapezoid is equal to the ratio of the two circumferential lengths of the circular ring surface, and the circular ring surface is formed after a plurality of trapezoids are arranged circumferentially.

The assembly is configured to absorb energy within a centrally focused annular radiation zone. The vertical projection formed by all the heat absorption flat tubes is the same as the size of the annular radiation area, and the maximum radiation intensity on the tube row does not exceed the tolerance range of common materials. The utility model discloses use the flat pipe of heat absorption and twist reverse the characteristic, make each position horizontal heating area unchangeable to through increase inclination downwards's method, increase the axial length of flat pipe lower part heating surface. By combining the three characteristics, the heat absorption area is larger on the annular heated area and is closer to the inner edge of the ring, so that the heat absorption area can adapt to the radiation distribution characteristic of central focusing.

In the utility model, the heat absorbing flat tube is filled with a heat exchange medium during operation, the thickness of the heat exchange medium is between 4 and 20mm according to the size of the flat tube with standard specification, and the flat tube structure is convenient for heat to be transferred from stainless steel to the heat exchange medium. The heat exchange medium can be one of liquid molten salt, gas, heat conduction oil or liquid metal.

In the utility model, the heat-absorbing flat tube is made of stainless steel, preferably nickel-based alloy steel, and the header and the flat tube are made of the same material. The header is covered by a protective material to avoid illumination radiation.

The utility model discloses in: when welding with the header is not considered, all heat absorption flat tubes are completely the same. At the top, the heat absorption flat tubes have no torsion angle, the projection width of the heat absorption flat tubes is equal to the section length of the heat absorption flat tubes, at the bottom, each heat absorption flat tube is twisted by 60-90 degrees, finally, the width ratio of two projected ends of a single heat absorption flat tube is the same as the perimeter ratio of a circular radiation surface, and the vertical projection formed by the close circumferential arrangement of a plurality of twisted heat absorption flat tubes is the same as the shape of a circular radiation area. The torsion characteristic enables the heating area of each heat absorption flat pipe to be kept unchanged under the condition that the projection width is reduced. The specific torsion angles of the two heat absorption flat tubes at different positions need to correspond to the vertical projections of the two heat absorption flat tubes, so that the projections are ensured to be in the same trapezoid shape.

The utility model discloses in: the length-width ratio of the cross section of the heat absorption flat pipe is larger than or equal to the external and internal perimeter ratio of the circular ring-shaped radiant surface, the torsion angle is smaller than or equal to 90 degrees at the moment, and the preferred torsion angle is 60-90 degrees. In the international special-shaped steel pipe, the cross section can be selected to be rectangular, oval or flat oval, so that the flat oval pipe is preferable for processing round pipes and uniformly heating fluid. Because the ratio of the inner circumference to the outer circumference of the circular ring-shaped radiation surface is usually less than 0.5, the length-width ratio of the cross section of the flat tube is adapted to the ratio of the circumference of the circular ring, and the ratio of the length-width of the flat tube is more than or equal to the ratio of the circumference of the outer circumference to the circumference of the circular arc surface of the radiation area, so that the required trapezoidal projection can be formed through proper torsion, and then the circular ring-shaped projection.

The utility model discloses in: during specific implementation, the downward inclination angle of the lower part of the flat pipe is gradually increased, the axial length of the flat pipe at the lower part is increased in the same projection area, and the radiation intensity and the temperature of the lower part are reduced.

After the structure is adopted, the utility model discloses beneficial effect does:

(1) the utility model discloses in, every heat absorption flat pipe has half area all the time to be shone by illumination, has avoidd the interior marginal regional small shortcoming of area of ring, can be fast even conduct the energy to in the thin layer heat absorption medium. The other half of the non-irradiation area has larger thermal inertia, so that the adverse effect of thermal shock on the heat absorber can be effectively reduced.

(2) The utility model discloses in, single flat pipe of heat absorption from the top down sees, and the sunny side temperature distribution is higher from evenly transiting gradually to the top arc surface completely. Because the high radiation surface of the top surface of the lower part is close to the backlight surface, the energy can be quickly transferred to the backlight area, and the whole temperature distribution is uniform.

(3) The utility model discloses in, the inclination of the flat pipe of lower part heat absorption progressively increases, has increased the length of the regional radiant surface in lower part, has reduced radiation density to reduce surperficial highest temperature, can be suitable for the ring radiation region of center focus.

Drawings

Fig. 1-2 are schematic diagrams of the present invention, the accompanying drawings being included to provide a further understanding of the invention and forming a part of this application and not being construed as unduly limiting the invention.

Fig. 1 is the utility model discloses an overall structure schematic diagram of heat absorber subassembly, include: the heat absorption flat tubes 1, the crossed heat absorption flat tubes 2, the lower header 3 and the upper header 4.

Fig. 2 is the utility model provides a single flat pipe twist reverse and increase schematic diagram behind lower part inclination.

Fig. 3 is the header structure assembly diagram of the embodiment of the present invention.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings, wherein the exemplary embodiments and the description are only for the purpose of illustrating the present invention, but not for the purpose of limiting the same.

Example 1

As shown in fig. 1, a tower-type photo-thermal power generation heat absorber assembly for center focusing is composed of a plurality of heat absorbing flat tubes and two headers, wherein two ends of each heat absorbing flat tube are welded on the headers in a crossed manner; the single heat absorption flat pipe is twisted by 60-90 degrees, the vertical projection of the single heat absorption flat pipe is trapezoidal, the ratio of the upper side length to the lower side length of the trapezoid is equal to the ratio of the two circumferential lengths of the circular ring surface, and the circular ring surface is formed after a plurality of trapezoids are arranged circumferentially.

The heat absorption flat pipes and the headers are arranged in an axisymmetric circumferential manner. When the heat absorber is in an operating state, the high-multiple solar energy flow focused by the center is projected onto the sunny side of the flat pipe, and the sunny side occupies half of the surface area of the flat pipe. In the lower region where the radiation energy density is large, the temperature of the surface is reduced by the structure shown in fig. 2. The heat transfer medium is evenly distributed to each heat absorption flat pipe by the header, and the heat of the wall surface of the flat pipe is evenly absorbed through heat conduction and convection heat transfer in the flowing process of the thin layer heat transfer medium in the flat pipe, and after the temperature of a plurality of strands of heat transfer medium is raised, the heat transfer medium flows into the header to be mixed, and then the heat transfer medium is discharged or enters the next group of heat absorber components.

The selectable cross section of the heat absorption flat pipe is rectangular, oval or flat oval, so that the flat oval pipe is preferable for processing round pipes and enabling fluid to be heated uniformly.

The flat elliptical tube and the header are made of nickel-based alloy steel, and the header is covered by a protective material to avoid illumination radiation.

As shown in fig. 2, the flat elliptic tube has no torsion angle at the uppermost end, and has the largest torsion angle at the lowermost end, and the torsion characteristic ensures that the heating surface of each part of the flat tube is half of the surface area. The lower part of the flat elliptic tube also increases the length of the lower heated surface within the same projection area by increasing the downward inclination angle.

Example 2

The utility model discloses another kind of embodiment of heat absorber subassembly, the quantity of single subassembly heat absorption flat pipe is different, generally along with the constantly rising of medium temperature on the flow direction, the flat pipe quantity of heat absorption of subassembly constantly reduces, and the continuous increase of flow speed helps reducing the heat absorber surface highest temperature, has nevertheless increased manufacturing cost.

Claims

1. A tower type photo-thermal power generation heat absorber component for central focusing is characterized in that the heat absorber component is composed of a plurality of heat absorption flat pipes and a header, and two ends of each heat absorption flat pipe are welded on the header in a crossed manner; the single heat absorption flat pipe is twisted by 60-90 degrees, the vertical projection of the single heat absorption flat pipe is trapezoidal, the ratio of the upper side length to the lower side length of the trapezoid is equal to the ratio of the two circumferential lengths of the circular ring surface, and the circular ring surface is formed after a plurality of trapezoids are arranged circumferentially.

2. The tower photo-thermal power generating heat absorber assembly for central focusing according to claim 1, wherein the upper portion of the header is covered with a protective material to protect against light radiation.

3. The tower-type photothermal power heat absorber assembly for central focusing according to claim 1, wherein the heat absorbing flat tubes have a rectangular, elliptical or flat elliptical cross section.

4. The tower-type photothermal power heat absorber assembly for central focusing according to claim 1, wherein said heat absorbing flat tube is a flat elliptic tube having a cross-sectional aspect ratio corresponding to the ratio of two circumferential lengths of a circular ring.

5. The tower-type photo-thermal power generation heat absorber assembly for central focusing according to claim 1, wherein the heat absorbing flat tubes and the header are made of the same stainless steel.

6. The tower-type photo-thermal power generation heat absorber assembly for central focusing according to claim 1, wherein a heat exchange medium is arranged inside the heat absorption flat tube, and the thickness of the heat exchange medium is 4-20 mm.

7. The tower-type photothermal power heat absorber assembly for center focusing according to claim 1, wherein: the heat absorption flat tubes are arranged in an axisymmetric circumference.