CN-121977296-A - Terminal heat collecting tube supporting structure for groove type heat collector

CN121977296ACN 121977296 ACN121977296 ACN 121977296ACN-121977296-A

Abstract

The invention belongs to the technical field of groove type solar thermal power generation, and discloses a terminal heat collecting tube supporting structure for a groove type heat collector, which comprises a heat collecting tube supporting structure, a heat collector rotating shaft extending shaft, a heat collecting tube fixing frame and a fixing sheet, the heat collecting pipe supporting structure adopts a plane truss structure, the bottom is rotatably arranged on the heat collector rotating shaft extending shaft, the top is rotatably connected with the heat collecting pipe fixing frame, and the heat collecting pipe fixing frame is connected with the heat collecting pipe extending pipe through a fixing piece. According to the invention, three structural forms of the single truss, the double truss space frame and the single truss with the connecting pipe are arranged, the heat dissipation loss is reduced by reducing the contact area, the expansion and contraction displacement is absorbed by the axial movable connection, and the processing error is compensated by the gap adjustment of the connecting piece. The invention can greatly reduce the torque and bending moment transmitted to the heat collecting pipe by flexible connection, avoid the deformation and damage of the heat collecting pipe, simultaneously ensure that the heat collector has compact structure, improve the land utilization rate and is suitable for various large-opening-size groove-type heat collectors.

Inventors

XU HAIWEI
MENG QINGYAN
CHEN CHUANCHAO
YU KE

Assignees

常州龙腾光热科技股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260209

Claims (10)

1. The tail end heat collecting tube supporting structure for the groove type heat collector comprises a heat collecting tube supporting structure (1), a heat collecting tube rotating shaft extending shaft (5), a heat collecting tube fixing frame (11) and a fixing sheet (12), wherein the heat collecting tube supporting structure (1) is of a plane truss structure, the bottom of the heat collecting tube supporting structure is rotatably arranged on the heat collecting tube rotating shaft extending shaft (5), a chord member (10) of the heat collecting tube supporting structure (1) is a closed section steel tube, the top of the heat collecting tube supporting structure (1) is rotatably connected with the heat collecting tube fixing frame (11), the heat collecting tube fixing frame (11) is connected with the heat collecting tube extending tube (4) through the fixing sheet (12), and the fixing sheet (12) is welded on the heat collecting tube extending tube (4).
2. A terminal heat collecting tube supporting structure for a trough type heat collector according to claim 1, wherein a plurality of small-area protrusions are provided at the contact of the heat collecting tube fixing frame (11) with the heat collecting tube extension tube (4), and a plurality of first small-area protrusions (111) are provided at the contact of the fixing piece (12) with the heat collecting tube fixing frame (11).
3. The terminal heat collecting tube supporting structure for a trough type heat collector according to claim 2, wherein the heat collecting tube supporting structure (1) comprises two plane truss structures which are identical in size and are erected in parallel, bottoms of the two plane truss structures are respectively and independently supported on the heat collector rotating shaft extending shaft (5), tops of the two plane truss structures are respectively and rotatably connected with two heat collecting tube fixing frames (11), and the two heat collecting tube fixing frames (11) are respectively connected with two fixing sheets (12).
4. A terminal collector tube support structure for a trough collector according to claim 3, wherein a plurality of connecting rods (18) are provided at positions of the two planar truss structures close to the collector tube (3) and at middle positions of the truss, and both ends of the connecting rods (18) are respectively rotatably connected with the two planar truss structures, so that the two planar truss structures form a space frame structure.
5. The terminal heat collecting tube supporting structure for the trough type heat collector according to claim 4, wherein the heat collecting tube supporting structure (1) is of a single-piece plane truss structure, a top rotating shaft (102) is arranged at the top of the heat collecting tube supporting structure (1), a connecting tube (14) is arranged on the top rotating shaft (102), heat collecting tube fixing frames (11) are respectively arranged at two ends of the connecting tube (14), and the two heat collecting tube fixing frames (11) are respectively connected with the heat collecting tube extension tube (4) through fixing sheets (12).
6. A terminal heat collecting tube supporting structure for a trough type heat collector according to claim 5, wherein at least one of the heat collecting tube holders (11) at both ends of the connection tube (14) is connected to the corresponding fixing piece (12) so as to be movable in the axial direction of the heat collecting tube extension tube (4).
7. The terminal heat collecting tube supporting structure for the trough type heat collector according to claim 6, wherein the top rotating shaft (102) is connected with the chord member (10) of the planar truss structure through a connecting sheet (17), strip holes are formed in the connecting sheet (17), and the relative positions of the connecting sheet (17) and the chord member (10) are adjusted through hole gaps.
8. The terminal heat collecting tube supporting structure for a trough type heat collector according to claim 7, wherein a bottom rotating shaft (101) is provided at a top of one end of the heat collector rotating shaft extending shaft (5) away from the heat collector, and the bottom of the heat collecting tube supporting structure (1) is rotatably connected with the heat collector rotating shaft extending shaft (5) through the bottom rotating shaft (101).
9. The terminal heat collecting tube supporting structure for the trough type heat collector according to claim 8, wherein a fixing frame buckle (13) is arranged on the heat collecting tube fixing frame (11), the fixing frame buckle (13) and the heat collecting tube fixing frame (11) are connected through bolt fastening to jointly clamp the heat collecting tube extension tube (4), and a plurality of second small-area protrusions (131) are arranged at the contact position of the fixing frame buckle (13) and the heat collecting tube extension tube (4).
10. The terminal collector tube support structure for a trough collector according to claim 1, wherein the chord member (10) adopts a square tube of 80mm x3mm, and the welding portion (121) of the fixing piece (12) and the collector tube extension tube (4) is a discontinuous welding structure.

Description

Terminal heat collecting tube supporting structure for groove type heat collector Technical Field The invention belongs to the technical field of groove type solar thermal power generation, and particularly relates to a terminal heat collecting tube supporting structure for a groove type heat collector. Background The trough solar thermal power generation technology is one of the solar thermal power generation technologies which are relatively mature in commercial application at present. The solar energy heat collector has the core principle that sunlight is reflected and converged on a heat collecting pipe through a groove-type reflecting mirror, a heat transfer working medium in the heat collecting pipe is heated, and then electric energy output is realized through power generating equipment such as a steam turbine and the like. At present, all commercial tank type photo-thermal power stations in the world adopt an operation strategy that a heat collecting pipe and a reflecting mirror synchronously rotate. Compared with a heat collector with a fixed heat collecting tube and a single rotating reflecting mirror, the synchronous rotating structure can effectively reduce the loss of sunlight in the transmission process and has higher optical efficiency. In the operation mode in which the heat collecting tube and the reflecting mirror rotate synchronously, the heat collecting tube needs to rotate along with the change of the position of the sun. Connection structures which can adapt to different rotation angles are required to be arranged between the heat collecting pipes and the fixed pipelines of the power station, and the structures are flexible connection structures. Besides the position change caused by the rotation of the heat collecting tube, the flexible connection structure is generally required to adapt to the length change of the heat collecting tube caused by expansion and contraction at different temperatures. Aiming at the flexible connection problem of the heat collecting tube, various solutions are proposed in the prior art. US patent application US20170045264A1 in agogo 2017 proposes a new flexible connection scheme, which adopts a combined structure of a winding tube and a hose to absorb the position change of a heat collecting tube relative to a fixed tube, and the structure is shown in fig. 1. Fig. 1 is a schematic view of a conventional heat collector end hose connection scheme. Fig. 1 shows a flexible connection structure of a combination of a winding pipe and a hose, which is proposed by the agogo patent, and the connection mode of the winding pipe, the hose, the heat collecting pipe and a fixed pipeline is clearly shown in the figure, and the structure realizes the absorption of the position change of the heat collecting pipe through the bending deformation of the winding pipe and the expansion and contraction of the hose. In this patent, two main solutions of the current industry are also mentioned: And (a) connecting 2-3 spherical joints in series in the pipeline, and absorbing the integral position change between the heat collecting pipe and the fixed pipeline by utilizing the characteristic that the two ends of the spherical joints can generate angle deflection. The scheme (b) adopts a combined structure of a metal hose and a plane rotary joint, wherein the metal hose is used for absorbing the length change caused by heat expansion and cold contraction of the heat collecting tube, and the plane rotary joint is used for absorbing the angle change caused by rotation of the heat collecting tube. With the large-scale development of the trough type photo-thermal power station, in order to reduce the construction cost of unit area, the opening size of the trough type heat collector is gradually increased. Correspondingly, the size of the heat collecting tube is increased, so that the size of the spherical joint and the metal hose adopted in the flexible connection structure is also increased, and the overall mass of the flexible connection structure is obviously increased. If the tail end heat collecting tube is not fixed by adopting a reasonable supporting structure, the weight of the flexible connecting structure and the inertia force generated in the rotation process of the heat collecting tube can be transmitted to the heat collecting tube. These forces can cause the heat collecting tube to deform beyond the design conditions, resulting in higher heat dissipation loss, and in severe cases, the heat collecting tube may be damaged, thereby causing leakage of the heat transfer medium in the heat collecting tube, and the deformation is shown in fig. 2. Fig. 2 is a diagram showing deformation of a heat collecting pipe caused by insufficient supporting strength of an end of a conventional heat collector. Fig. 2 shows a state that the heat collecting tube is bent and deformed by the action force of flexible connection without a reasonable supporting structure, and it can be seen from the fig