A modular insulation structure suitable for tower-type solar thermal power station absorber

Abstract

The present invention discloses a modular insulation structure suitable for a tower-type solar thermal power station absorber, including a modular insulation layer arranged on the backlight side of the absorber tube panel, the modular insulation layer is fixed between the absorber tube panel and the support frame through a support frame, and the modular insulation layer is in close contact with the absorber tube panel, wherein the modular insulation layer includes a plurality of sub-insulation modules. The present invention improves and optimizes the insulation structure for the back of a conventional tower-type solar thermal power station absorber, and divides the insulation of the back of the tube panel into multi-span, multi-layer and multi-block insulation modules according to the tube panel structure design. In order to meet the high-altitude layout requirements of the absorber, the insulation layer is composed of a combination of multiple layers of hard insulation materials, which is installed and carried on the support frame of the tube panel, and is only in close contact with the absorber tube panel. The modular tube panel insulation is suitable for the early on-site installation and later maintenance and replacement of the absorber of the solar thermal power station.

Description

Technical Field

[0001] The present invention relates to the technical field of solar thermal power generation, and more specifically, to a modular insulation structure suitable for a heat absorber of a tower-type solar thermal power station. Background Art

[0002] For solar thermal power stations, the back-end power generation principle is similar to that of thermal power stations, but in terms of heat collection, solar thermal power stations are much more complicated than thermal power stations. How to make efficient use of the solar energy heat collected with great effort is extremely important, but how to reduce unnecessary heat loss is also very critical.

[0003] In the tower solar thermal power generation system, the absorber arranged at the top of the absorber tower is one of the core equipment to realize the light-heat conversion of the power station. Its safe and efficient operation is extremely important to the power station. For the absorber, its absorber tube screen is divided into the light-facing side and the backlight side. The light-facing side receives direct irradiation from the reflected light spot of the mirror field for heat absorption and energy conversion, while the backlight side is used to reduce heat loss by laying insulation to improve the operating efficiency of the absorber.

[0004] However, for tower-type heat absorbers, especially those using molten salt as the heat absorbing medium, the installation of the back insulation of the tube screen cannot be implemented by referring to the water-cooled wall tube screen of thermal power boilers. The main reason is that the structures of the two are quite different. The water-cooled wall tube screen of the boiler needs to adopt a membrane wall tube screen, that is, the gap between the heated tubes is sealed by connecting with flat steel to prevent the smoke inside the furnace from leaking out. The outer insulation layer is mostly made of flexible insulation materials, fixed on the insulation metal parts welded on the tube screen, and expands and contracts with the tube screen when heated. However, for tower-type heat absorbers, due to the extremely uneven distribution of heat flux density on the surface of the tube screen, the heated tube needs to adopt an independent light tube structure to avoid uneven heating and expansion to tear the flat steel or tube. At the same time, during the operation of the heat absorber, each heated tube will expand or deform to varying degrees due to uneven heating, thus creating gaps between the tubes. Under the long-term action of high-altitude strong wind loads, the flexible insulation on the back of the tube screen will be cracked. It is understood that similar situations have occurred in the solar thermal power stations that have been put into operation in China in the early stage. Furthermore, due to the low operating pressure of the molten salt absorber, in order to reduce temperature differences and thermal stress, the heated tubes are mostly made of extremely costly thin-walled tubes. If the insulating metal parts are directly welded or fixed to the tubes, the tubes will easily be welded through or damaged, and replacing the tubes will further increase the related costs.

[0005] In summary, due to the special installation and structural requirements of the tower-type CSP power station absorber, its insulation cannot use conventional insulation materials and installation methods. Summary of the invention

[0006] In view of the situation existing in the prior art, the present invention optimizes the design of the insulation on the back of the tube panel in combination with the special structure and installation requirements of the tower-type solar thermal power station absorber, and proposes a modular insulation structure for the tower-type solar thermal power station absorber.

[0007] The present invention provides a modular insulation structure suitable for a tower-type solar thermal power station absorber, comprising a modular insulation layer arranged on the backlight side of an absorber tube panel, wherein the modular insulation layer is fixed between the absorber tube panel and the support frame through a support frame, and the modular insulation layer is in close contact with the absorber tube panel, wherein the modular insulation layer comprises a plurality of sub-insulation modules.

[0008] According to an embodiment of the modular insulation structure applicable to a tower-type solar thermal power station absorber of the present invention, the modular insulation layer is divided into a number of spans, each span of the modular insulation layer is divided into a number of layers, each layer of the modular insulation layer is divided into a number of blocks, wherein each modular insulation layer is a sub-insulation module.

[0009] According to an embodiment of the modular insulation structure applicable to a tower-type solar thermal power station absorber of the present invention, adjacent spans, adjacent layers and adjacent blocks of the modular insulation layer are installed in a staggered and pressed manner.

[0010] According to an embodiment of the modular insulation structure applicable to the absorber of a tower-type solar thermal power station of the present invention, the sub-insulation module includes a high-temperature insulation layer, a medium-low temperature insulation layer and an outer plate of the insulation layer. The high-temperature insulation layer is arranged close to the backlight side of the absorber tube screen, the medium-low temperature insulation layer is arranged in the middle, and the outer plate of the insulation layer is arranged on the outside.

[0011] According to an embodiment of the modular insulation structure applicable to the absorber of a tower-type solar thermal power station of the present invention, the high-temperature insulation layer, the medium-low temperature insulation layer and the outer plate of the insulation layer are fixed by perforating the insulation layer fixing piece, and the high-temperature insulation layer adopts a countersunk hole design to accommodate the head of the insulation layer fixing piece.

[0012] According to an embodiment of the modular insulation structure applicable to the absorber of a tower-type solar thermal power station of the present invention, the high-temperature insulation layer and the medium- and low-temperature insulation layer are made of hard insulation materials, and the hard insulation materials are calcium silicate boards, ceramic fiber boards or nano-porous insulation boards; the outer layer of the insulation layer is a metal plate.

[0013] According to an embodiment of the modular insulation structure applicable to a tower-type solar thermal power station absorber of the present invention, the support frame is assembled from steel sections by fixing bolts, and the support frame is used to fix the absorber tube panel and the modular insulation layer.

[0014] According to an embodiment of the modular insulation structure applicable to the absorber of a tower-type solar thermal power station of the present invention, the sub-insulation module of the modular insulation layer is fixed to the support frame after being integrated with the insulation layer fixing member through a flat fixing member, wherein the flat fixing member is installed on the outside of the outer plate of the insulation layer and is arranged in a multi-layer arrangement.

[0015] Compared with the conventional scheme, the present invention improves and optimizes the insulation structure used on the back of the conventional tower-type solar thermal power station absorber, and divides the insulation on the back of the tube panel into multi-span, multi-layer and multi-block insulation modules according to the tube panel structure design. In order to meet the high-altitude layout requirements of the absorber, the insulation layer is composed of multiple layers of hard insulation materials, which are installed and carried on the supporting frame of the tube panel and are only in close contact with the absorber tube panel. The modular tube panel insulation is suitable for the early on-site installation and later maintenance and replacement of the absorber of the solar thermal power station. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The schematic diagram of the overall structure of a modular thermal insulation structure applicable to a tower-type solar thermal power station absorber according to an exemplary embodiment of the present invention is shown as being installed on a tube panel.

[0017] Figure 2 A schematic structural diagram of a modular thermal insulation structure applicable to a tower-type solar thermal power station absorber according to an exemplary embodiment of the present invention is shown.

[0018] Figure 3A and Figure 3B The schematic structural diagrams of the first sub-insulation module and the second sub-insulation module are shown respectively.

[0019] Figure 4A Shows Figure 3B In the A-direction view, Figure 4B Shows Figure 4A Schematic diagram of the top view structure.

[0020] Description of reference numerals:

[0021] 1-absorber header, 2-absorber tube screen, 3-modular insulation layer, 31-first sub-insulation module, 32-second sub-insulation module, 311 / 321-high temperature insulation layer, 312 / 322-medium and low temperature insulation layer, 313 / 323-insulation layer outer plate, 4-support frame, 51 / 52-fixing bolts, 61 / 62 / 63-insulation layer fixings, 7-flat fixings. DETAILED DESCRIPTION

[0022] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0023] Any feature disclosed in this specification, unless otherwise stated, can be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0024] The modular insulation structure of the present invention applicable to the tower-type solar thermal power station absorber is first described in detail below.

[0025] The present invention includes many improvements, and the overall design idea is: first, the material of the insulation layer is a hard insulation material with high mechanical strength rather than a flexible material to prevent tearing damage under the long-term action of high-altitude wind loads; second, the insulation layer is divided into multi-span, multi-layer and multi-block sub-insulation modules according to the structure, which is convenient for manufacturing, processing and installation; third, the insulation layer is composed of a combination of multiple layers of insulation materials, which is laid on the outside of the insulation layer outer plate and fixed and carried on the support frame of the tube panel by fixing parts, without the need to be directly fixed on the thin-walled heat-receiving tube by welding metal parts, and can be in close contact with the heat-receiving tube of the absorber tube panel, so as not to cause welding penetration or damage to the tube. The overall insulation structure scheme is convenient for early on-site installation and later maintenance and replacement.

[0026] Figure 1 The schematic diagram of the overall structure of the modular insulation structure applicable to the tower-type solar thermal power station absorber according to an exemplary embodiment of the present invention is shown, Figure 2 A schematic structural diagram of a modular thermal insulation structure applicable to a tower-type solar thermal power station absorber according to an exemplary embodiment of the present invention is shown.

[0027] like Figure 1 and Figure 2 As shown, according to an exemplary embodiment of the present invention, the modular insulation structure applicable to the absorber of a tower-type solar thermal power station is applicable to the design and installation of the insulation layer on the back of the absorber tube panel of the tower-type solar thermal power station. Specifically, the modular insulation structure applicable to the absorber of a tower-type solar thermal power station includes a modular insulation layer 3 arranged on the backlight side of the absorber tube panel, the modular insulation layer 3 is fixed between the absorber tube panel 2 and the support frame 4 through a support frame 4, and the modular insulation layer 3 is in close contact with the absorber tube panel 2, wherein the modular insulation layer 3 includes a plurality of sub-insulation modules. In addition, the absorber tube panel 2 is connected to the absorber header 1 above and below.

[0028] For the absorber arranged at high altitude in the tower-type solar thermal power station, the tube panel is divided into the light-facing side and the backlight side. The light-facing side receives the incident light spot of the mirror field to absorb heat, and the backlight side needs to be covered with an insulation layer to insulate the absorber to reduce heat loss. Due to the particularity of the absorber structure, the modular insulation layer 3 of the present invention is fixed to the internal main steel structure through the support frame 4, wherein the modular insulation layer 3 is fixed between the absorber tube panel 2 and the support frame 4, and the modular insulation layer 3 is only in close contact with the absorber tube panel 2, and the modular insulation layer 3 is not installed by conventional welding or fixing of metal parts on the tube panel.

[0029] According to the structural design requirements of the absorber tube panel, the modular insulation layer 2 in the present invention is divided into several spans from top to bottom, each span of the modular insulation layer is divided into several layers, each layer of the modular insulation layer is divided into several blocks, and the size of each block can be determined based on the screen width of the absorber tube panel and the size of the insulation material. Among them, each modular insulation layer is a sub-insulation module.

[0030] In order to reduce installation gaps and heat losses, adjacent spans, adjacent layers and adjacent blocks of the modular thermal insulation layer 2 of the present invention are preferably installed in a staggered and pressed manner.

[0031] Figure 3A and Figure 3B The schematic diagrams of the structures of the first sub-insulation module 31 and the second sub-insulation module 32 are shown respectively. Figure 3A and Figure 3B As shown, the sub-insulation module of the present invention includes a high-temperature insulation layer 311 / 321, a medium-low temperature insulation layer 312 / 322 and an insulation layer outer plate 313 / 323, wherein the high-temperature insulation layer 311 / 321 is arranged close to the backlight side of the absorber tube panel 2, the medium-low temperature insulation layer 312 / 322 is arranged in the middle, and the insulation layer outer plate 313 / 323 is arranged on the outside. The insulation layer outer plate 313 / 323 can be a metal plate, such as a thin-walled steel plate.

[0032] In addition, the high-temperature insulation layer 311 / 321, the medium-low temperature insulation layer 312 / 322 and the insulation layer outer plate 313 / 323 are fixed through holes in the insulation layer fixing parts 61 / 62 / 63. Preferably, the high-temperature insulation layer 311 / 321 adopts a countersunk hole design to accommodate the head of the insulation layer fixing parts 61 / 62 / 63 to avoid the end of the insulation layer fixing parts being exposed to affect the close fit between the modular insulation layer and the absorber tube screen. The insulation layer fixing parts 61 / 62 / 63 can be high-temperature resistant bolts. In addition, the hole spacing of each layer of the sub-insulation module should not be too large or too small, and should be determined based on comprehensive considerations such as the characteristics of the insulation material, load, overall structure and economy.

[0033] In order to meet the application of high-altitude arrangement of the heat absorber, the high-temperature insulation layer 311 / 321 and the medium-low temperature insulation layer 312 / 322 are made of hard insulation materials, which are calcium silicate boards, ceramic fiber boards or nano-microporous insulation boards.

[0034] The support frame 4 used in the present invention is assembled by steel sections through fixing bolts 51 / 52, and does not require on-site welding and is convenient and quick to install. The support frame 4 is used to fix the absorber tube panel 2 and the modular insulation layer 3. The modular insulation layer on the back of the absorber tube panel is provided with steel sections of the support frame above and below each span, which is used to bear the vertical load of the upper modular insulation layer. Overall, the loads of all modular insulation layers and insulation metal parts are borne by the support frame 4.

[0035] Figure 4A Shows Figure 3B In the A-direction view, Figure 4B Shows Figure 4A Schematic diagram of the top view structure.

[0036] like FIG. 3A to FIG. 4B As shown, the sub-insulation modules of the modular insulation layer 3 are fixed to the support frame 4 after being integrated with the insulation layer fixing members 61 / 62 / 63 through the flat fixing members 7, which not only restrict the horizontal shaking of the insulation layer, but also bear part of the load. The flat fixing members 7 are installed on the outside of the insulation layer outer plate 313 / 323 and are arranged in multiple layers. The flat fixing members can be structural members such as flat steel.

[0037] Therefore, the modular insulation layer in the modular insulation structure of the present invention is suitable for early on-site installation and later maintenance and replacement, and can well meet the special installation and structural requirements of the tower-type solar thermal power station absorber.

[0038] The present invention will be further described below in conjunction with specific embodiments.

[0039] In this embodiment, the modular insulation layer 3 on the backlight side of the absorber tube panel 2 is designed in a modular structure, and mainly includes the following components:

[0040] High temperature insulation layer 311 / 321, medium and low temperature insulation layer 312 / 322, insulation thin-walled steel plate 313 / 323, insulation layer fixing parts 61 / 62 / 63, flat fixing parts 7, etc., in addition, it also includes a support frame 4 for fixing the absorber tube panel 2 and the modular insulation layer 3, etc.; the modular insulation layer 3 is divided into multiple spans from top to bottom, each span contains multiple layers, and each layer is divided into multiple blocks, wherein adjacent layers and blocks are installed by staggered seams and pressure seams, such as Figure 2 and Figure 4B shown.

[0041] The modular insulation layer 3 is made of hard insulation materials, such as calcium silicate board, ceramic fiber board or nano-microporous insulation board; each insulation module 31 / 32 is composed of a high-temperature insulation layer 311 / 321 + a medium-low temperature insulation layer 312 / 322 + an insulation layer outer plate 313 / 323. Among them, the high-temperature resistant insulation layers 311 and 321 are close to the back of the tube screen, the medium-low temperature insulation layer 312 / 322 is arranged in the center, and the outer insulation layer plate 313 / 323 made of thin-walled steel plate is laid on the outside. The three are fixed through holes in the insulation layer fixing parts 61 / 62 / 63 using high-temperature resistant bolts; the high-temperature insulation layer 311 / 321 adopts a countersunk hole design to prevent the exposed end of the fixing bolt from affecting the close fit between the modular insulation layer 3 and the absorber tube screen 2;

[0042] The insulation modules 31 / 32 are assembled by pressing seams, and are fixed on the support frame 4 of the tube panel after being integrated with the insulation layer fixing members 61 / 62 / 63 through the flat fixing members 7. Figure 4A and Figure 4B As shown; wherein, a flat fixing piece 7 made of flat steel is installed on the outside of the outer plate 313 / 323 of the insulation layer, and can be arranged in multiple layers; each span of the modular insulation layer 3 is arranged with steel sections above and below to bear the vertical load of the upper modular insulation layer 3, and the load of the modular insulation layer 3 and the required insulation metal parts are borne by the support frame 4 as a whole; the support frame 4 is assembled by steel sections through fixing bolts 51 / 52, and no welding is required on site, so the installation is convenient and quick.

[0043] The present invention is not limited to the above-mentioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A modular insulation structure suitable for a tower-type solar thermal power station absorber, characterized in that: It includes a modular thermal insulation layer arranged on the backlight side of the absorber tube panel, the modular thermal insulation layer is fixed between the absorber tube panel and the support frame through a support frame, and the modular thermal insulation layer is in close contact with the absorber tube panel, wherein the modular thermal insulation layer includes a plurality of sub-thermal insulation modules; The modular insulation layer is divided into a number of spans, each span of the modular insulation layer is divided into a number of layers, each layer of the modular insulation layer is divided into a number of blocks, wherein each block of the modular insulation layer is a sub-insulation module; Adjacent spans, adjacent layers and adjacent blocks of the modular insulation layer are installed by staggered and pressed seams; The sub-insulation module includes a high-temperature insulation layer, a medium-low temperature insulation layer and an insulation layer outer plate, wherein the high-temperature insulation layer is arranged close to the backlight side of the absorber tube panel, the medium-low temperature insulation layer is arranged in the middle, and the insulation layer outer plate is arranged on the outside; The high-temperature insulation layer, the medium-low temperature insulation layer and the outer plate of the insulation layer are fixed by perforating the insulation layer fixing piece, and the high-temperature insulation layer adopts a countersunk hole design to accommodate the head of the insulation layer fixing piece; The high-temperature insulation layer and the medium- and low-temperature insulation layer are made of hard insulation materials, which are calcium silicate boards, ceramic fiber boards or nano-porous insulation boards; the outer layer of the insulation layer is a metal plate; The support frame is made of steel sections assembled by fixing bolts, and is used to fix the absorber tube panel and the modular insulation layer; The sub-insulation modules of the modular insulation layer are fixed to the support frame after being integrated with the insulation layer fixing members through flat fixing members, wherein the flat fixing members are installed on the outside of the outer plate of the insulation layer and are arranged in multiple layers.

Images