CN2554560Y - parabolic trough reflector solar boiler - Google Patents

Abstract

The utility model provides a parabolic trough reflector solar boiler, which is mainly composed of a trough reflector, a heat collecting tube, a heat conducting tube, a heat storage pressure-resistant water tank, a valve, a bracket, wheels, etc. A plurality of reflectors with a parabolic inner groove cross section are neatly arranged, and a heat collecting tube is suspended by a bracket on the focal line of the reflector, and the diameter of the heat collecting tube is about 1/20 of the focal length of the trough reflector. The parabolic trough reflector solar boiler absorbs the advantages of solar water heaters and solar cookers, can reach a high temperature of more than 120 to 200°C, does not require any additional tracking device, and can automatically and accurately track for more than 4 to 8 hours. Because it can generate high-temperature steam, it is called a boiler. It has a large amount of concentrated light and heat, a simple and compact structure, is easy to connect side by side, is easy to manufacture, has a low cost, is environmentally friendly and energy-saving, and is an energy device worthy of promotion.

Description

Parabolic trough mirror solar boiler

Technical field:

The utility model relates to a boiler, in particular to a solar boiler with a parabolic trough reflector.

Background technique:

At present, the technology of using solar energy in the society mainly adopts methods of directly absorbing heat, or using concave mirrors to reflect light and heat to focus and then absorb heat. For example, a solar water heater is composed of closely arranged heat-absorbing pipes, reflectors, and heat-insulating water tanks. Structure, filled with insulating material in the middle, so as to store heat and reduce loss. A solar cooker is a concave mirror that reflects sunlight and heat to a focal point to heat objects.

More than two kinds of ways of utilizing solar energy have weak points, and solar water heater reaches maximum temperature in summer but 80～90 ℃, can not boil water. Solar cookers are difficult to track, and can only absorb solar energy for a longer period of time by manually adjusting them or adding sophisticated electronic automatic tracking devices.

Invention content:

The purpose of the utility model is to provide a parabolic trough reflector solar boiler capable of generating high-temperature steam without any additional tracking device, which has a large concentration and heat collection, and has a simple and compact structure.

The technical solution adopted by the utility model is: the section is a parabolic inner groove-shaped reflector 2 arranged neatly, and the heat-collecting tube 1 is suspended by a bracket 9 on the line connecting the focal points, and the diameter of the heat-collecting tube 1 is about the groove-shaped reflector. 2 1/20 of the focal length.

The parabolic trough reflector solar boiler absorbs the advantages of solar water heaters and solar cookers, can reach a high temperature above 120-200°C, does not need any additional tracking device, and can automatically and accurately track for more than 4-8 hours. Because it can generate high-temperature steam, it is called a boiler. It has a large concentration of light and heat, a simple and compact structure, easy to connect side by side, easy to manufacture, low cost, environmental protection and energy saving, and it is an energy device worthy of promotion.

Description of drawings:

Fig. 1 is the structural representation of the utility model.

Figure 2 is a cross-sectional view of the structure of the utility model.

Fig. 3 is three views of the parabolic trough reflector.

Parabolic trough reflector solar boiler is mainly composed of trough reflector 2, heat collecting tube 1, heat conducting tube 3, heat storage and pressure water tank 5, valve, bracket 9, wheels 8 and so on.

The parabolic trough reflector 2 is tile arc-shaped, concave inward, and becomes trough-shaped because of its length, and the cross-section is a parabola. The inner surface is silver-plated, which can completely reflect light and heat.

The heat collecting tube 1 is a round tube, which is longer than the two ends of the trough reflector by a focal length, and can be made of black pressure-resistant glass or stainless steel. The heat collecting tube must be dark black to facilitate heat absorption.

The heat pipe 3 is also a round pipe, which has excellent thermal insulation performance. Wherein the live chromium conduit 4 two ends can be folded and rotated along the horizontal horizontal axis, and the middle can reciprocate, and a sealing ring is arranged, and one end is connected to the water tank 5, and one end is connected to the heat pipe 3, and a rotating joint is equipped near the junction.

The heat storage and pressure-resistant water tank 5 is a cylinder placed horizontally, divided into inner and outer layers, with heat insulating material between the interlayers, and a water outlet and heat-conducting pipe joints (two) are arranged below the water tank. A water inlet 7 and a steam outlet 6 are left above.

Support 9 points are fixed and movable two parts, and fixed part supports water tank 5 and movable part. Bottom adornment wheel 8, each wheel can change direction. The movable part is used to connect the parabolic trough reflector, the heat collecting tube and the heat conducting tube. The movable bracket is attached to the fixed bracket by the "ten" axis, and the inclination angle can be adjusted through two support rods 10 and the worm gear mechanism. The lower end support rod can be inside and outside. One-way rotation, the upper end is equipped with a "cross" shaft.

Heat collecting tube 1, flexible conduit 4, water tank 5 are connected successively, and water tank 5 is positioned at the top. Fixed bracket 9 connects the water tank positioned at the top, the movable bracket heat collection assembly in the middle, and the wheels 8 at the bottom.

work process:

When using the utility model, the water tank will be filled with water. The three-dimensional adjustment is made through the wheels and the struts, so that the trough reflector is directly facing the sun, and the swing direction is consistent with the sun track. After the sunlight is reflected, it is focused on the heat collecting tube and becomes a dazzling bright line and hot line. Because the trough mirror moves in the same direction as the sun. When the sun moves westward, the reflected light can not only continue to focus to form a bright line, but also the bright line moves slowly along a straight line and falls on the heat collecting tube all the time. This phenomenon is called inherent straight line automatic tracking, which is a unique performance of parabolic trough mirrors. What would have this performance? This is the result of superposition of 2D reflections. Viewed from the cross-section, the incident light is always perpendicular to the tangent to the vertex of the parabola, so it can always be focused. Viewed from the longitudinal section, the incident angle of sunlight changes, and the reflection angle also changes accordingly.

When it is heated, the water in the heat collecting tube heats up quickly. Due to the volume expansion, the water rises and convects, and flows to the heat storage tank through the heat conducting tube, and the water in the tank is denser, so it can also flow into the heat collecting tube through the heat conducting tube. In this way, the water in the heat storage tank can continuously obtain heat. After boiling, water vapor is generated, which is output from the top air pipe, and boiled water is output from the bottom outlet pipe.

Since the earth's rotation plane and the sun's revolution orbit plane have an intersection angle, the sun's trajectory changes back and forth between straight lines and arcs. The inclination angle of sunlight also changes alternately at noon, and changes by 1° in about 4 days. In view of this, it is processed in sections. The largest arcs are the summer solstice and winter solstice. From 10 am to 2 pm, the inclination changes only by 2.4°. Taking the midline, the tracking error is only 1.2°. After adjustment, due to the symmetry of the arc, the bright line moves back and forth once between the two sides of the heat collecting tube. The automatic tracking time of vernal equinox and autumnal equinox is the longest, and the straight line has no deviation. The focal length of the heat collecting tube is slightly longer, just to adapt to the vertical movement.

Because the bright line formed by focusing always has a certain width, which cannot be ignored, so strictly speaking, the cross-section shape of the heat collecting tube should be elliptical, and the long axis distance is 1 focal length/25+1 focal length/20 (the former is tracking deviation, The latter is to estimate the bright line width), and the minor axis is still focal length/25. For example: y=1/8x ² , a focal length of 1m, and a parabolic trough reflector with a width of 2m need an elliptical collector tube with a major axis of 9 and a minor axis of 4-5.

Claims (1)

1, a kind of parabola flute profile speculum solar boiler, comprise water tank, heat-absorbing water pipe, speculum and support, it is characterized in that: the cross section is several proper alignment of parabola indent flute profile speculum (2), adorning thermal-collecting tube (1) by support (9) is outstanding on its focus line, thermal-collecting tube (1) diameter is about 1/20 of flute profile speculum (2) focal length.

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