Solar water working medium natural circulation saturated steam absorber

Abstract

The present invention discloses a solar water working medium natural circulation saturated steam heat absorber, comprising a heat absorbing tube panel, wherein the heat absorbing tube panel is provided with multiple groups of vertically arranged tube groups, each group of tube groups including multiple heat absorbing pipes, each heat absorbing pipe having a straight pipe section in the middle and curved pipe sections at both ends, and the curved pipe sections at both ends of each heat absorbing pipe having different curvatures. The straight pipe sections of the multiple heat absorbing pipes in each group of tube groups are arranged parallel to each other, and the curved pipe sections at both ends are deflected into the same plane. The present invention provides a highly efficient and economical solar water working medium natural circulation saturated steam heat absorber covering all power levels. It has a simple structure and low cost, does not require a large heliostat field, and is suitable for distributed solar thermal utilization in industry, food, pharmaceuticals, and civil applications. The heat absorber uses natural circulation to generate saturated steam, and does not require a forced circulation pump. It uses solar energy as an energy source and does not generate any pollutant emissions or carbon emissions.

Description

Technical Field

[0001] The present invention relates to the technical field of solar thermal utilization, and more particularly to a solar water working medium natural circulation saturated steam heat absorber. Background Art

[0002] Currently, various industries rely heavily on coal, oil, and natural gas as heat sources for steam and heat generation. The combustion of these fossil fuels produces a large amount of pollutants, such as dust, nitrogen oxides, sulfides, and carbon dioxide. These harmful substances and greenhouse gas emissions pollute and impact the environment. Solar energy is an inexhaustible, renewable, clean energy source that holds significant significance for addressing humanity's energy crisis, environmental pollution, and climate change.

[0003] In the field of solar thermal utilization, common ones include solar water heaters, solar thermal power generation equipment, etc., which are both low-temperature utilization and high-temperature utilization. However, most industrial fields require medium-temperature solar thermal utilization, and there are currently few technologies and applications.

[0004] Existing technologies and devices for generating saturated steam include the following: direct-fired boilers and waste heat boilers, which generate significant amounts of pollutants and carbon emissions, polluting the environment; electric boilers, which consume high power and have high operating costs, and are subject to regional power load control; and fluid heat exchangers, which require external energy to heat the heat source fluid, representing secondary heat exchange and a narrow range of applications. All of these technologies and devices, based on their energy sources, generate certain pollutants and carbon emissions, limiting their application.

[0005] In addition, in the existing heat absorber, the expansion amount of each heat absorption tube in the heat absorption tube panel in the vertical direction is inconsistent, which may cause large thermal stress in the heat absorption pipe, easily leading to deformation and damage of the heat absorption pipe; in addition, there is a lack of a certain buffer space and sufficient repair space for the heat absorption pipe that expands due to heat. Summary of the Invention

[0006] An object of the present invention is to solve at least the above problems and to provide at least the advantages which will be described hereinafter.

[0007] Another object of the present invention is to provide a solar water working medium natural circulation saturated steam heat absorber, which is efficient, economical, and easy to assemble and repair and maintain.

[0008] To achieve these objects and other advantages according to the present invention, the present invention provides a solar water working medium natural circulation saturated steam absorber, including a heat absorbing tube panel, wherein the heat absorbing tube panel is provided with multiple groups of vertically arranged tube groups, each tube group includes multiple heat absorbing pipes, each heat absorbing pipe is provided with a straight pipe section in the middle and curved pipe sections at both ends, and the curvature of the curved pipe sections at both ends of each heat absorbing pipe is different. The straight pipe sections of the multiple heat absorbing pipes in each tube group are arranged parallel to each other, and the curved pipe sections at both ends are deflected into the same plane.

[0009] Preferably, the bend sections at both ends of each heat absorbing pipe are divided into a first bend section and a second bend section, and the curvature of the first bend section is smaller than that of the second bend section.

[0010] Preferably, each tube group includes four heat absorbing pipes, the arrangement positions of the first bend sections and the second bend sections of the four heat absorbing pipes are different, and the bend sections of every two adjacent heat absorbing pipes are arranged in axisymmetry or center symmetry.

[0011] Preferably, the first curved pipe section of each heat absorbing pipe includes connecting pipe 1, connecting pipe 2 and connecting pipe 3 connected in sequence, wherein connecting pipe 1 is connected to one end of the straight pipe section, and connecting pipe 2 is parallel to the straight pipe section.

[0012] Preferably, the second curved pipe section of each heat absorbing pipe includes a connecting pipe four, a connecting pipe five and a connecting pipe six connected in sequence, wherein the connecting pipe four is connected to the other end of the straight pipe section, and the connecting pipe five is parallel to the straight pipe section.

[0013] Preferably, the straight pipe sections of the four heat absorbing pipes in each pipe group are arranged parallel to each other in plane one, and the connecting pipes 2 and 3 in the first curved pipe section and the connecting pipes 5 and 6 in the second curved pipe section of the four heat absorbing pipes are all arranged in plane two, and plane one and plane two are perpendicular to each other.

[0014] Preferably, it further comprises an upper header and a lower header, and the bend sections at both ends of each heat absorbing pipe in the heat absorbing tube panel are respectively connected to the upper header and the lower header.

[0015] Preferably, a support frame and two shading covers are provided on the periphery of the heat absorbing tube panel. The support frame is provided on the backlight side of the heat absorbing tube panel, and the two shading covers are provided on the light receiving side of the heat absorbing tube panel and respectively cover the periphery of the upper header and the lower header.

[0016] Preferably, a natural circulation device is further included, which is provided with a boiler drum and a steel frame, the lower header is connected to the boiler drum through a water supply pipe and a downcomer, the upper header is connected to the boiler drum through an outlet pipe, a steam outlet is also provided on the boiler drum and is connected to a saturated steam pipe, and the boiler drum and heat absorbing tube panel are respectively located on the inner and outer sides of the steel frame.

[0017] Preferably, the heat absorbing tube panel is formed by arranging multiple tube groups into a flat plate shape, a folded angle shape, a square shape or a polygonal shape.

[0018] The present invention has at least the following beneficial effects: It provides a solar-water natural circulation saturated steam absorber covering all power levels. This system utilizes concentrated solar energy as energy input to heat water within the absorber tube panel, generating saturated steam suitable for various heat and steam-using industries, including industry, pharmaceuticals, food processing, and heating. The steam generation process by the absorber produces no pollutants or carbon emissions, making it a clean, renewable, efficient, economical, and easy to assemble, repair, and maintain saturated steam generator.

[0019] Other advantages, objectives and features of the present invention will be reflected in part from the following description and will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a front view of the heat absorbing tube panel in one technical solution of the present invention;

[0021] Figure 2 A side view of the heat absorbing tube panel in another technical solution of the present invention;

[0022] Figure 3 This is a front view of the heat absorbing pipe in another technical solution of the present invention;

[0023] Figure 4 The arrangement of the four heat absorbing pipes in each pipe group in another technical solution of the present invention;

[0024] Figure 5 This is a schematic structural diagram of a solar water working medium natural circulation saturated steam heat absorber according to another technical solution of the present invention;

[0025] Figure 6 This is a water circulation flow chart of the solar water working medium natural circulation saturated steam absorber described in another technical solution of the present invention. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments so that those skilled in the art can implement the invention with reference to the description.

[0027] It should be understood that terms such as “having”, “including” and “comprising” used herein do not preclude the existence or addition of one or more other elements or combinations thereof.

[0028] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials can be obtained from commercial channels unless otherwise specified.

[0029] In the description of the present invention, the terms "horizontal", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0030] like Figures 1 to 6 As shown, the present invention provides a solar water working medium natural circulation saturated steam absorber, including a heat absorbing tube panel 100. The heat absorbing tube panel 100 is provided with multiple groups of vertically arranged tube groups 101. Each tube group 101 includes multiple heat absorbing pipes 102. Each heat absorbing pipe 102 is provided with a straight pipe section 103 in the middle and curved pipe sections 104 at both ends. The curvature of the curved pipe sections 104 at both ends of each heat absorbing pipe 102 is different. The straight pipe sections 103 of the multiple heat absorbing pipes 102 in each tube group 101 are arranged parallel to each other, and the curved pipe sections 104 at both ends are deflected into the same plane.

[0031] In the above technical solution, the solar water working medium natural circulation saturated steam heat absorber described in the present invention is provided with a vertically suspended heat absorption tube panel 100. The heat absorption tube panel 100 adopts a planar layout and is composed of a plurality of heat absorption tubes 102 forming a plane to absorb sunlight reflected by the heliostat. The middle of the heat absorption tube 102 is a straight tube section 103, and the two ends are specially designed curved tube sections 104, and the curvature of the curved tube sections 104 at both ends is different. The multiple heat absorption tubes 102 in each tube group 101 can be installed upright, inverted, folded 180° and then upright, and folded 180° and then inverted, so that the straight tube sections 103 are parallel and arranged in the same plane, and the curved tube sections 104 are alternately arranged on both sides of the plane. The heat absorbing tube panel 100 adopts a specially designed bent tube structure. Only two different shapes of bent tubes can be combined to form a heat absorbing tube panel 100 with expansion bends and sufficient welding space. It can absorb the thermal expansion difference between the heat absorbing pipes 102. At the same time, there is enough repair space to facilitate the rapid replacement of accidentally damaged heat absorbing pipes 102 on site. The heat absorber can be assembled as a whole and shipped out of the factory, and hoisted and installed as a whole. This technical solution provides a full-power solar water working medium natural circulation heat absorber, which uses concentrated solar energy as energy input to heat the water inside the heat absorbing tube panel 100 and generate saturated steam. It can be applied to various heat and steam-using industries such as industry, pharmaceuticals, food processing, and heating. The heat absorber does not produce any pollutant emissions or carbon emissions in the process of producing steam. It is a clean, renewable, efficient and economical saturated steam generating device that is easy to assemble and repair and maintain.

[0032] In another technical solution, the curved pipe sections 104 at both ends of each heat absorbing pipe 102 are divided into a first curved pipe section 105 and a second curved pipe section 106 , and the curvature of the first curved pipe section 105 is smaller than that of the second curved pipe section 106 .

[0033] In another technical solution, each tube group 101 includes four heat-absorbing tubes 102. The first bends 105 and second bends 106 of each of the four heat-absorbing tubes 102 are arranged in different positions, and the bends of each pair of adjacent heat-absorbing tubes 102 are arranged axially or centrally symmetrically. In this technical solution, the four heat-absorbing tubes 102 can be installed upright, inverted, folded 180° and then upright, or folded 180° and then inverted. The heat-absorbing tube panel 100 utilizes a specially designed bend structure. Using only two different bend shapes, it can be assembled into a tube panel with expansion bends and sufficient welding space. This can absorb thermal expansion differences between tubes, while also providing ample repair space for rapid replacement of accidentally damaged tubes on site.

[0034] In another technical solution, the first curved pipe section 105 of each heat absorbing pipe 102 includes a connecting pipe 107, a connecting pipe 2 108 and a connecting pipe 3 109 connected in sequence, wherein the connecting pipe 1 is connected to one end of the straight pipe section 103, and the connecting pipe 2 is parallel to the straight pipe section 103.

[0035] In another technical solution, the second curved pipe section 106 of each heat absorbing pipe 102 includes a connecting pipe 4 110, a connecting pipe 5 111 and a connecting pipe 6 112 connected in sequence, wherein the connecting pipe 4 is connected to the other end of the straight pipe section 103, and the connecting pipe 5 is parallel to the straight pipe section 103.

[0036] In another technical solution, the straight sections 103 of the four heat-absorbing pipes 102 in each pipe group 101 are arranged parallel to each other in plane 1. The connecting pipes 2 108 and 3 109 in the first curved section 105 of the four heat-absorbing pipes 102, as well as the connecting pipes 5 111 and 6 112 in the second curved section 106, are all arranged in plane 2. Planes 1 and 2 are perpendicular to each other. In this technical solution, the optimal angle between the axes of connecting pipes 1 107, 3 109, and 2 108 is 35°, and the optimal angle between the axes of connecting pipes 4 110, 6 112, and 5 111 is 70°. This allows the first curved section 105 to be a spatial bend offset by 0.5 times the pipe pitch, and the second curved section 106 to be a spatial bend offset by 1.5 times the pipe pitch.

[0037] Another technical solution further includes an upper header 200 and a lower header 201 , and the bend sections at both ends of each heat absorbing pipe 102 in the heat absorbing tube panel 100 are connected to the upper header 200 and the lower header 201 respectively.

[0038] In another technical solution, the outer periphery of the absorber tube panel 100 is provided with a support frame 300 and two light shields 301. The support frame 300 is located on the backlight side of the absorber tube panel 100, and the two light shields 301 are located on the light-receiving side of the absorber tube panel 100, respectively covering the outer peripheries of the upper header 200 and the lower header 201. In this technical solution, the heat receiving surface of the absorber adopts a single-sided planar layout, and the absorber tube panel 100 adopts a modular design. The support frame 300 is configured on the back and can be used as both a manufacturing tooling and a packaging and transportation frame. During on-site installation, the support frame 300 can be conveniently mounted on a steel frame, saving materials and facilitating manufacturing, transportation, and installation.

[0039] Another technical solution also includes a natural circulation device, which is equipped with a boiler drum 400 and a steel frame. The lower header 201 is connected to the boiler drum 400 via a water supply pipe 402 and a downpipe 403. The upper header 200 is connected to the boiler drum 400 via an outlet pipe 404. The boiler drum 400 is also provided with a steam outlet and connected to a saturated steam pipeline. The boiler drum 400 and the heat absorption tube panel 100 are respectively located on the inner and outer sides of the steel frame. In this technical solution, the heat absorber adopts a natural circulation method, and a forced circulation pump is not required. The heat absorption tube panel 100 heats water into a steam-water mixture, which enters the boiler drum 400 through the outlet pipe 404. After steam and water separation, saturated steam is generated and transported to downstream users through the saturated steam pipeline on the boiler drum 400. The water in the boiler drum 400 enters the heat absorption tube panel 100 through the downpipe 403 and the water supply pipe 402. The steel frame is a frame structure, the heat absorbing tube panel 100 is located outside the steel frame, and the boiler drum 400 is placed inside the steel frame. The platform stairs inside the steel frame can reach each platform to operate, monitor, maintain and repair the heat absorber.

[0040] In another technical solution, the heat absorbing tube panel 100 is composed of multiple tube groups 101 arranged in a flat, angled, square, or polygonal shape. In this technical solution, the heat absorbing tube panel 100 can be arranged in a single-sided flat surface, or in an angled, square, or polygonal shape, providing flexibility.

[0041] The number of devices and processing scales described herein are intended to simplify the description of the present invention. Applications, modifications, and variations of the present invention will be readily apparent to those skilled in the art.

[0042] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. Solar water working medium natural circulation saturated steam absorber, characterized in that: The heat absorbing tube panel comprises a plurality of vertically arranged tube groups, each tube group comprising a plurality of heat absorbing tubes, each heat absorbing tube having a straight tube section in the middle and curved tube sections at both ends, wherein the curvature of the curved tube sections at both ends of each heat absorbing tube is different, and the straight tube sections of the plurality of heat absorbing tubes in each tube group are arranged parallel to each other, and the curved tube sections at both ends are deflected into the same plane; The bend sections at both ends of each heat absorbing pipe are divided into a first bend section and a second bend section, and the curvature of the first bend section is smaller than the curvature of the second bend section; each tube group includes four heat absorbing pipes, and the arrangement positions of the first bend sections and the second bend sections of the four heat absorbing pipes are different, and the bend sections of each two adjacent heat absorbing pipes are arranged in axisymmetry or center symmetry; the first bend section of each heat absorbing pipe includes a connecting pipe 1, a connecting pipe 2, and a connecting pipe 3 connected in sequence, wherein the connecting pipe 1 is connected to one end of the straight pipe section, and the connecting pipe 2 is parallel to the straight pipe section; the second bend section of each heat absorbing pipe includes a connecting pipe 4, a connecting pipe 5, and a connecting pipe 6 connected in sequence, wherein the connecting pipe 4 is connected to the other end of the straight pipe section, and the connecting pipe 5 is parallel to the straight pipe section; The included angles between the axes of the first and third connecting pipes and the second connecting pipe are 35°, and the included angles between the axes of the fourth, sixth and fifth connecting pipes are 70°, so that the first bend section is offset by 0.5 times the pipe pitch, and the second bend section is offset by 1.5 times the pipe pitch; The straight pipe sections of the four heat absorbing pipes of each pipe group are arranged parallel to each other in plane one, and the connecting pipes 2 and 3 in the first curved pipe section and the connecting pipes 5 and 6 in the second curved pipe section of the four heat absorbing pipes are all arranged in plane two, and plane one and plane two are perpendicular to each other.

2. The solar water working medium natural circulation saturated steam absorber according to claim 1, characterized in that: It also includes an upper header and a lower header, and the bend sections at both ends of each heat absorbing pipe in the heat absorbing tube panel are respectively connected to the upper header and the lower header.

3. The solar water working medium natural circulation saturated steam absorber according to claim 2, characterized in that: The outer periphery of the heat absorbing tube panel is provided with a support frame and two light shields. The support frame is provided on the backlight side of the heat absorbing tube panel, and the two light shields are provided on the light receiving side of the heat absorbing tube panel and respectively cover the outer periphery of the upper header and the lower header.

4. The solar water working medium natural circulation saturated steam absorber according to claim 3, characterized in that: It also includes a natural circulation device, which is provided with a boiler drum and a steel frame. The lower header is connected to the boiler drum through a water supply pipe and a downcomer, and the upper header is connected to the boiler drum through an outlet pipe. A steam outlet is also provided on the boiler drum and is connected to a saturated steam pipe. The boiler drum and the heat absorbing tube panel are respectively located on the inner and outer sides of the steel frame.

5. The solar water working medium natural circulation saturated steam absorber according to claim 1, characterized in that: The heat absorbing tube panel is formed by arranging multiple tube groups into a polygon.

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