JP6036541B2 - Heat collecting receiver for solar power generation and repair method thereof - Google Patents

Description

  The present invention relates to a heat collecting receiver for solar thermal power generation and a repair method thereof.

Conventionally, a solar thermal power generation system as shown in FIG. 9 is known. In this solar thermal power generation system, sunlight is reflected by thousands to tens of thousands of heliostats 100, and the reflected light is installed at the uppermost part of the light collecting tower 101 having a height of about 100 m to 150 m. And heat collecting receiver 102 is heated with the energy of sunlight. A heat medium such as air is circulated to the heated heat collection receiver 102 by using a heat medium circulation pump 103 to recover heat, and the recovered high-temperature heat medium is sent to the steam generator 104 to evaporate water. The turbine generator 105 is driven by steam to generate power. The steam that has passed through the turbine generator 105 is returned to water by the condenser 106 and is circulated by the water circulation pump 107. In many cases, a heat collecting receiver repair crane 108 is installed above the light collecting tower 101.
In a solar thermal power generation facility with a power generation capacity of about 20 MW, the area of the light receiving surface of the heat collecting receiver is about 200 to 400 m ² .

As a heat collection receiver used for a solar thermal power generation system, for example, those shown in Patent Document 1 and Patent Document 2 are known.
The heat collecting receiver shown in Patent Document 1 (Fig. 2 of Patent Document 1) is a porous light-absorbing body (ceramic honeycomb) lined up to form a light-receiving surface. The heat absorber is heated and heated while the atmosphere passes through the porous heat absorber to become high-temperature air, and solar heat is recovered. The porous heat absorber is individually supported by a support, and this support is fixed to the base of the heat collecting receiver. The porous heat absorber has a hexagonal shape, is individually supported by the support, and is densely arranged. Although not specifically described in Patent Document 1, when exchanging the porous heat absorber, a crane is suspended from the top of the light collecting tower having a height of 100 m or more from the ground, and the heat collecting receiver It is presumed that the porous heat absorber is removed from the outer side (light receiving surface side) and replaced together with the support. Since the work is performed in an extremely high place, it is dangerous and the replacement cost is high.

  Further, the heat collecting receiver shown in Patent Document 2 (FIG. 1 of Patent Document 2) forms a light receiving surface by combining a plurality of ceramic honeycombs which are heat absorbers, and the plurality of ceramic honeycombs are supported by one support. ing. In this heat collecting receiver, the ceramic honeycomb is heated by receiving sunlight, and the heat medium is heated while passing through the ceramic honeycomb to become a high-temperature heat medium, and the solar heat is recovered.

As mentioned earlier, in solar thermal power generation, sunlight is reflected by a large number of heliostats, collected on a heat collection receiver and recovered, and water is evaporated with the recovered heat. Drive to get power. In order to obtain high-temperature and high-pressure steam that can drive the steam turbine, the heat collecting receiver uses several thousand to tens of thousands of heliostats to collect the sun about 400 to 800 times the sunlight. Light is irradiated. At this time, 400 to 800 kW / m ² of solar energy flows into the light receiving surface of the heat collecting receiver.

According to the experiments by the present inventors, when solar energy of about 400 kW / m ² was collected on the heat collecting receiver light receiving surface, the temperature of the heat collecting light receiving surface that was not cooled rose to 1300 ° C. or higher. For this reason, about the light-receiving surface of a heat collecting receiver, it is necessary to use the material which has high heat resistance, or to provide the function which can always be cooled. For this reason, the light receiving surfaces of the heat collecting receivers of Patent Documents 1 and 2 are also made of a ceramic honeycomb.

US 6003508 specification JP 2012-93003 A

Since the member constituting the light receiving surface of the heat collecting receiver receives sunlight with a very large energy density of 400 to 800 kW / m ² , a large temperature distribution (temperature) from the surface (light receiving surface) of the component member in the depth direction. Deviation).
Also, on the light receiving surface of the heat collection receiver, sunlight is condensed only during the daytime when the sun is coming out and becomes hot, and at night, it is exposed to the atmosphere and cooled to the atmospheric temperature, so that heating and cooling are performed every day. Repeated. Therefore, generation of the temperature distribution (temperature deviation) of the constituent members of the light receiving surface as described above is repeated every day.

Even during the day, if the solar radiation is temporarily interrupted due to the passage of clouds, etc., the amount of heat input to the light receiving surface of the heat collecting receiver will change, and the temperature of the components on the light receiving surface will be several It may fluctuate rapidly in the range of one hundred degrees Celsius.
In addition, since sunlight from many heliostats gathers on the light receiving surface, a large variation occurs in the light collection energy density within the light receiving surface.

When the above temperature deviation and temperature fluctuation are repeatedly generated in the constituent members of the light receiving surface, there are the following problems.
In a heat collecting receiver whose light receiving surface temperature exceeds 1200 ° C. at maximum, a ceramic honeycomb mainly composed of silicon carbide having a high strength against repeated stress is used on the light receiving surface. Ceramics mainly composed of silicon carbide have a linear expansion coefficient of about 3 to 4 × 10 ⁻⁶ 1 / ° C. For example, when the temperature rises from 20 ° C. to 1200 ° C., a ceramic having a length of 1 m is 3.5. Extends by about 4.7 mm. In the ceramic honeycomb, only the light receiving surface rises due to the temperature rise, but the temperature does not rise greatly in the portion not exposed to light, and the distribution of the amount of elongation occurs inside the ceramic, resulting in stress. When this stress exceeds the compressive strength or tensile strength of the ceramic, the ceramic is destroyed.

As a result of the occurrence of thermal stress as described above being repeated every day, the ceramic honeycomb causes problems such as cracking and cracking of a part on the high temperature side.
When the ceramic honeycomb falls off, it is necessary to stop and repair the equipment. However, the heat collection receiver is installed on the upper part of the light collecting tower with a height of about 100 m to 150 m. Not only is the cost high, but there is also a problem of opportunity loss that power generation in the daytime becomes impossible unless repairs are completed at night.

  Moreover, since the heat collecting receiver of patent document 1 arrange | positions a support for every ceramic honeycomb and comprises a light-receiving surface, there exists a difficulty that a structure is complicated and it is difficult to replace | exchange ceramic honeycombs. Further, since the honeycomb support structure is complicated, the manufacturing cost is also increased. Also, the heat collecting receiver of Patent Document 2 has a complicated structure, and there is a difficulty in replacing the ceramic honeycomb. Moreover, since the external shape of the heat collecting receiver is complicated, the manufacturing cost is also increased.

Accordingly, an object of the present invention is to solve the above-described problems of the prior art and to provide a heat collecting receiver in which cracking and dropping off of the ceramic honeycomb due to repeated thermal stress is unlikely to occur.
Another object of the present invention is to provide a heat collecting receiver that can easily and inexpensively assemble a ceramic honeycomb and that can be easily replaced in addition to the ceramic honeycomb not easily cracking or falling off. It is in.
Furthermore, another object of the present invention is to provide a repair method capable of easily exchanging the ceramic honeycomb in such a heat collecting receiver.

In order to solve the above problems, the present inventors have studied the structure of the ceramic honeycomb of the heat collecting receiver, and as a result, by optimizing the shape and dimensions of the ceramic honeycomb, cracking and dropping off of the ceramic honeycomb are effectively suppressed. I found out that
Further, as a result of examining the holding structure of the ceramic honeycomb, the ceramic honeycomb can be easily and inexpensively assembled by holding the ceramic honeycomb on a specific honeycomb holding body, and the ceramic honeycomb can be easily replaced (repaired). I found that I could do it.

The present invention has been made on the basis of the above-described findings and has the following gist.
[1] A plurality of ceramic honeycombs (2) are arranged so that the cells (20) that are heat medium gas passages are arranged in parallel, and the end face of each ceramic honeycomb (2) constitutes the light receiving surface (a). With body (1),
The heat transfer gas was collected on each ceramic honeycomb (2) in the process of flowing from the light receiving surface (a) side to the anti-light receiving surface (b) side through the cells (20) of each ceramic honeycomb (2). In a heat collection receiver that is heated by solar heat,
The equivalent diameter D of each ceramic honeycomb (2) defined by the following formula (1) is 100 mm or more and 150 mm or less, and the shape ratio R of each ceramic honeycomb (2) defined by the following formula (2) is 1.0. The heat collection receiver for solar power generation characterized by being 1.5 or more.
D = 4M / P (1)
R = D / Z (2)
D: Equivalent diameter (mm)
M: Area [mm ² ] of the light receiving surface (a) of the ceramic honeycomb (2)
P: Perimeter of the light receiving surface (a) of the ceramic honeycomb (2) [mm]
R: Shape ratio [-]
Z: distance [mm] between the light receiving surface (a) and the anti-light receiving surface (b) of the ceramic honeycomb (2)

[2] The heat collecting receiver for solar power generation according to [1], wherein each ceramic honeycomb (2) has a rectangular parallelepiped shape or a prismatic shape, and is composed of silicon carbide ceramics. .
[3] In the heat collecting receiver of [1] or [2], the light receiving heat collecting body (1) includes a honeycomb holding body (3) supported at a lower part of the receiver,
The honeycomb holding body (3) is configured by assembling a lateral honeycomb support (4) and longitudinal struts (5) in a lattice pattern,
In each space (s) corresponding to the grids of the lattice of the honeycomb holder (3), four ceramic honeycombs (2) having two left and right and two upper and lower stages are housed, and adjacent to each other vertically and horizontally. Spacers (6) are interposed between the ceramic honeycombs (2),
A heat collecting receiver for solar power generation, wherein the honeycomb support (4) is connected to a support member (8) provided in the receiver via a connecting member (7).

[4] In the heat collecting receiver of [3] above, the light receiving surface of the ceramic honeycomb (2) is provided at the light receiving surface (a) side end and the anti-light receiving surface (b) side end of the honeycomb support (4). A stopper portion (40) that can be engaged with the end on the (a) side and the end on the anti-light-receiving surface (b) side is provided,
The vertical distance L between the stopper portions (40) of the upper and lower honeycomb supports (4) forming each space (s) and the two ceramic honeycombs (2) adjacent to each other in the upper and lower sides stored in each space (s). The total height h and the thickness t of the spacer (6) interposed between these two ceramic honeycombs (2) satisfy the relationship of L> h and L <h + t, for solar power generation Heat collecting receiver.

[5] When repairing the ceramic honeycomb (2) for the heat collecting receiver of [4] above,
After removing the spacer (6) interposed between the adjacent ceramic honeycombs (2) without removing the honeycomb support (4) and the support (5), the ceramic honeycomb (2) is taken out and a new ceramic honeycomb ( A method of repairing a heat collecting receiver, comprising mounting 2), and then mounting a spacer (6) between adjacent ceramic honeycombs (2) to complete the replacement of the ceramic honeycomb (2).

In the heat collecting receiver of the present invention, the ceramic honeycomb is not easily cracked or dropped off due to repeated thermal stress. For this reason, while being able to reduce repair costs, it is possible to avoid the opportunity loss that it takes time for repairs and power generation during the daytime becomes impossible, and the economic efficiency of solar thermal power generation can be improved.
Moreover, in the heat collecting receiver of the present invention, the ceramic honeycomb can be easily and inexpensively assembled by holding the ceramic honeycomb in the honeycomb holding body having a specific structure, and the ceramic honeycomb can be easily replaced. The economic efficiency of solar thermal power generation can be further increased.

  Further, according to the repair method of the present invention, even if a ceramic honeycomb constituting the heat collecting receiver light-receiving surface is cracked or dropped, it can be easily replaced without using a large crane. . For this reason, while being able to reduce repair costs, it is possible to avoid the opportunity loss that it takes time for repairs and power generation during the daytime becomes impossible, and the economic efficiency of solar thermal power generation can be improved.

FIG. 1A shows the shape and dimensions of a ceramic honeycomb provided in a light receiving heat collecting body of a heat collecting receiver of the present invention. FIG. 1A is a front view of the ceramic honeycomb, and FIG. 1B is I in FIG. Sectional view along line -I The front view which shows a part of light-receiving heat collecting body in one Embodiment of the heat collecting receiver of this invention Sectional view along line III-III in FIG. Sectional view along line IV-IV in FIG. FIGS. 5A and 5B show details of the honeycomb support 4 used in the embodiment of FIGS. 2 to 4, FIG. 5A is a plan view, and FIG. 5B is along the VV line in FIG. Cross section The details of the connecting member 7 used in the embodiment of FIGS. 2 to 4 are shown, FIG. 6 (a) is a plan view, and FIG. 6 (b) is along the VI-VI line in FIG. 6 (a). Cross section Explanatory drawing of the heat collection receiver used in the experiment FIG. 8A shows the configuration of the light receiving heat collector and the temperature measurement position of the heat collecting receiver used in the experiment. FIG. 8A shows the layout of the ceramic honeycomb in front of the light receiving heat collector, FIG. ) Is a drawing showing a temperature measurement position in a cross section taken along line VIII-VIII in FIG. Explanatory drawing showing an example of a conventional solar thermal power generation system

  FIG. 1 shows the shape and dimensions of a ceramic honeycomb provided in a light receiving heat collecting body of a heat collecting receiver of the present invention. FIG. 1 (a) is a front view of the ceramic honeycomb, and FIG. 1 (b) is FIG. It is sectional drawing which follows the II line | wire in the inside. 2 to 4 show a part of a light receiving heat collecting body in an embodiment of the heat collecting receiver of the present invention, FIG. 2 is a front view, and FIG. 3 is taken along the line III-III in FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3 and 4, the cross-sectional hatching of the ceramic honeycomb 2 is omitted.

  2 to 4, reference numeral 1 denotes a light receiving heat collector constituting a light receiving surface of a heat collecting receiver, and the light receiving heat collector 1 is a cell in which a plurality of ceramic honeycombs 2 are heat medium gas passages. 20 are arranged in parallel, and the end face of each ceramic honeycomb 2 constitutes a light receiving surface a. And the light-receiving surface A of the light-receiving heat collecting body 1 is formed by the collection of these light-receiving surfaces a. The heat collecting receiver 1 collects heat in each ceramic honeycomb 2 in a process in which a heat transfer gas (usually air) flows from the light receiving surface a side to the anti-light receiving surface b side through the cells 20 of each ceramic honeycomb 2. It is designed to be heated by solar heat.

The shape and material of each ceramic honeycomb 2 are arbitrary, but are usually silicon carbide (SiC) ceramics (ceramics mainly composed of silicon carbide) having a rectangular parallelepiped or prismatic shape and high strength against repeated stress. Composed.
The basic structure and functions of the heat collection receiver as described above are the same as those of the conventional heat collection receiver.
The ceramic honeycomb is a ceramic material in which a large number of thin cylindrical holes such as honeycombs are formed in parallel, and the cylindrical holes are called cells. However, the cross-sectional shape of the hole is not limited to a hexagon, but may be an arbitrary shape such as a square.

As described above, the light receiving surface of the heat collecting receiver is irradiated with sunlight condensed about 400 to 800 times the sunlight, and the members constituting the light receiving surface of the heat collecting receiver are 400 to 800 kW / m. ^Since sunlight having a very large energy density of about ^{2 is} received, a large temperature distribution (temperature deviation) is generated in the depth direction from the surface (light receiving surface) of the constituent member. Moreover, since sunlight is condensed only during the daytime, such a temperature distribution is repeated every day. The inventors of the present invention actually constructed a solar thermal power generation test facility and experimentally investigated what kind of heat load is generated in the heat collecting receiver. The contents of the experiment will be described below.

The experimental facility is located in Yokohama City, Kanagawa Prefecture. In the experimental facility, a heat collecting receiver provided with a light receiving heat collecting body having a light receiving surface in which silicon carbide ceramic honeycombs are arranged as shown in FIG. An air intake duct is connected to the light receiving surface of the light receiving heat collecting body, air (atmosphere) is sucked from the light receiving surface through the ceramic honeycomb by an exhaust fan, and the air is heated while cooling the ceramic honeycomb. Was obtained by calculating the heat recovery rate.
As a condensing method, a large number of heliostats having a 50 cm diameter mirror are arranged on the north side of the condensing tower, and the angle of the mirror is adjusted so that the reflected light is condensed on the light receiving surface of the light receiving collector. did. The total number of mirrors is 700. In conducting the experiment, the amount of direct solar radiation was measured and the heat input energy (incident light intensity) on the light receiving surface was calculated. In addition, a thermometer was installed in the ceramic honeycomb or on the side opposite to the light receiving surface of the ceramic honeycomb, and the temperature change of each part was measured.

FIG. 8 shows a configuration example and a temperature measurement position of the installed light receiving collector. 8A is a drawing showing the layout of the ceramic honeycomb in front of the light-receiving heat collector, and FIG. 8B is a drawing showing the temperature measurement position in the cross section along the line VIII-VIII in FIG. 8A. is there. In this example, the light receiving heat collector is composed of nine ceramic honeycombs (ceramic honeycombs H1 to H9) each having a light receiving surface dimension of 150 mm in length and width and a thickness (distance between the light receiving surface and the non-light receiving surface) of 100 mm. The front surface was used as the light receiving surface.
For all of the ceramic honeycombs H1 to H9, four points each of a light receiving surface −10 mm position (P1), a thickness direction center position (P2), a counter light receiving surface −10 mm position (P3), and a counter light receiving surface +10 mm position (P4), Temperature sensors were installed at a total of 36 points, and the temperature at each point was measured. Although not shown in the figure, the direct solar radiation intensity, the atmospheric temperature, and the flow rate of air passing through the ceramic honeycomb were also measured and used for calculating the heat recovery rate.

Table 1 summarizes the above experimental conditions. Table 2 shows an example of results obtained by conducting experiments under these experimental conditions and performing temperature measurements at P1 to P4.
According to Table 2, it can be seen that a large temperature deviation of 72 ° C. to 270 ° C. is generated in the ceramic honeycomb thickness direction (light receiving surface to anti-light receiving surface) as indicated by the temperatures P1 to P3. In each ceramic honeycomb, such occurrence of temperature deviation is repeated every day.
In addition, since sunlight from many heliostats gathers on the light receiving surface, there is a variation in the light collection energy density within the light receiving surface, and the temperature in the light receiving surface is 590 ° C. as indicated by P1 in Table 2. There is a large variation of ˜1247 ° C.

Based on the above experimental results, in order to find the optimal shape and dimensions of ceramic honeycombs that are less prone to cracking and falling off, the same experiment as described above was carried out by changing the dimensions of the ceramic honeycombs to determine whether the ceramic honeycombs were cracked or dropped off. investigated.
The experiment was conducted by selecting a time zone from 10 am to 2 pm in which the altitude of the sun is high, the direction of the sun is in the south, and the light collection conditions are good. After each experiment, light collection was stopped and the ceramic honeycomb was cooled in the atmosphere, and it was confirmed that the light receiving surface was not cracked or dropped.

The dimensions of the ceramic honeycomb were set to 100 mm to 175 mm in length and width, and 75 mm to 175 mm in thickness, respectively, on the premise that a rectangular parallelepiped honeycomb already mass-produced for industrial use was used. The shape does not have to be a rectangular parallelepiped, and may be a hexagonal column or the like. Honeycomb cracks and dropouts are thought to occur due to thermal expansion, but the amount of thermal expansion is considered to be proportional to the honeycomb dimensions, that is, the light receiving surface area and thickness, and the honeycomb internal temperature deviation. The equivalent diameter D and the shape ratio R defined by the following equation (2) are considered to be important, and the influences thereof were investigated.
D = 4M / P (1)
R = D / Z (2)
D: Equivalent diameter (mm)
M: area [mm ² ] of the light receiving surface a of the ceramic honeycomb 2
P: Perimeter of the light receiving surface a of the ceramic honeycomb 2 [mm]
R: Shape ratio [-]
Z: distance [mm] between the light receiving surface a and the anti-light receiving surface b of the ceramic honeycomb 2

  Here, the area of the light receiving surface “a” of the ceramic honeycomb 2 is, for example, in the case of the ceramic honeycomb of FIG. 1, area = vertical dimension H × horizontal dimension W. Further, the peripheral length of the light receiving surface a of the ceramic honeycomb 2 is the sum of the outer edge lengths of the light receiving surface a. In the case of the ceramic honeycomb of FIG. 1, the peripheral length = 2 × (vertical dimension H + lateral dimension W). It is. The distance Z between the light receiving surface a and the anti-light receiving surface b of the ceramic honeycomb 2 is the thickness of the ceramic honeycomb 2 as shown in FIG.

The results of the experiment are shown in Table 3. According to this, when the equivalent diameter D = 175 mm, all cracks are observed in the range of the shape ratio R = 1.0 to 1.75, and the ceramic honeycomb is divided when taken out. On the other hand, when the equivalent diameter D = 150 mm, fine and short hair cracks were observed with a shape ratio R = 1.0, but no cracks that would cause the ceramic honeycomb to be divided were reached. It is determined that there is no crack in the shape ratio R = 1.0 to 1.5. However, it breaks at the shape ratio R = 2.0. Further, when the equivalent diameter D = 100 mm, cracks are observed at the shape ratio R = 0.8. On the other hand, no crack is observed at the shape ratio R = 1.0, and the same is true at the shape ratio R = 1.33.
In summary, cracks are not generated when the equivalent diameter D is 150 mm or less and the shape ratio R is 1.0 to 1.5. On the other hand, if the equivalent diameter D is less than 100 mm, the number of ceramic honeycombs required to secure the required light receiving surface area increases, and the number of members for holding the same also increases. Becomes higher.

From the above results, in order to prevent the ceramic honeycomb from cracking and falling off and to obtain a highly durable light receiving surface of the heat collecting receiver, the present invention corresponds to each ceramic honeycomb 2 defined by the above formula (1). The diameter D is 100 mm or more and 150 mm or less, and the shape ratio R of each ceramic honeycomb 2 defined by the above formula (2) is 1.0 or more and 1.5 or less.
Although the light receiving surface a of the ceramic honeycomb 2 shown in FIG. 1 is square, the shape of the light receiving surface a is arbitrary and does not need to be square. It is desirable that the light receiving surface a and the light receiving surface A are formed in a substantially vertical direction.
Even if the equivalent diameter D is not less than 100 mm and not more than 150 mm, it is easy to break in a rectangle in which either the vertical or horizontal dimension of the light receiving surface a is extremely long. Therefore, the vertical and horizontal dimensions of the light receiving surface a are also 100 mm or more, respectively. It is preferable that it is 150 mm or less.

In a solar thermal power generation facility with a power generation capacity of about 20 MW, the area of the light receiving surface A of the heat collecting receiver is about 200 to 400 m ² . If the area is 400 m ² and the size of the light receiving surface a of one ceramic honeycomb is 150 mm in length and 150 mm in width, the number of ceramic honeycombs 2 required for the heat collecting receiver is about 18,000. The heat collecting receiver of the embodiment shown in FIGS. 2 to 4 can assemble a large number of such ceramic honeycombs easily and inexpensively, and can easily replace the ceramic honeycombs.

Hereinafter, the embodiment of FIGS. 2 to 4 will be described in detail.
The light receiving heat collecting body 1 includes a honeycomb holding body 3 supported by a lower part of the receiver (for example, a lower part of a structure such as a casing of the receiver), and the plurality of ceramic honeycombs 2 are held by the honeycomb holding body 3. Yes.
The honeycomb holding body 3 is configured by assembling a lateral honeycomb support 4 and a longitudinal support 5 in a lattice shape. The honeycomb support 4 and the support column 5 are each composed of a plate-like member, and are preferably made of the same ceramic material as the ceramic honeycomb 2 or a heat-resistant material (ceramic material, metal material, etc.) having the same thermal expansion coefficient. Here, the honeycomb holding body 3 abuts the end portions of the honeycomb supports 4 adjacent in the horizontal direction, puts the lower end of the support column 5 on each of the contact portions, stands the support column 5, and then sets the support column 5 on the upper end of each support column 5. In addition, by repeating the procedure of placing the butted portions of the ends of the honeycomb supports 4 adjacent to each other in the upper horizontal direction, and further placing the lower ends of the columns 5 on the butted portions to stand the columns 5, the sequence is sequentially repeated from the lower side. Assembled.

In each space s corresponding to the grid cells of the honeycomb holding body 3, four ceramic honeycombs 2 having two left and right and two upper and lower stages are accommodated (inserted), and adjacent ceramic honeycombs in the vertical and horizontal directions. A spacer 6 is detachably interposed between the two. This spacer 6 is comprised with the ceramic board which has 1400 degreeC or more heat resistance, and the thickness is about 5-10 mm normally. In the present embodiment, the same spacer 6 is interposed between the support column 5 and the ceramic honeycomb 2. In order to allow the ceramic honeycomb 2 to be taken into and out of the space s, a certain amount of clearance (play) is required between the ceramic honeycomb 2, the honeycomb support 4 and the support column 5, and the spacer 6 fills the clearance, and the ceramic The honeycomb 2 is held in the space s.
The vertical load of the ceramic honeycomb 2, the honeycomb support 4, the column 5, and the spacer 6 is supported by the column 5 in a state where the ceramic honeycomb 2 is stored and held in the honeycomb holding body 3 in this manner. Therefore, the material is selected and the size of the cross section is designed so that the support column 5 has sufficient compressive strength.

FIG. 5 shows details of the honeycomb support 4, FIG. 5 (a) is a plan view, and FIG. 5 (b) is a sectional view taken along line VV in FIG. 5 (a).
In order to ensure that the ceramic honeycomb 2 housed in the space s is restrained in the space s, the end of the honeycomb support 4 on the light receiving surface a side and the end of the anti-light receiving surface b side are The ceramic honeycomb 2 has a stopper portion 40 protruding from the light receiving surface a side end and the counter light receiving surface b side end. The stopper portion 40 is housed in the space s and serves to prevent the ceramic honeycomb 2 whose upper or lower surface is in contact with the honeycomb support 4 from moving out in the direction of the light receiving surface / anti-light receiving surface and exiting the space s.

  Here, the vertical distance L between the stopper portions 40 of the upper and lower honeycomb supports 4 forming each space s, the total height h of the two adjacent ceramic honeycombs 2 stored in each space s, The thickness t of the spacer 6 interposed between the two ceramic honeycombs 2 is configured to satisfy the relationship of L> h and L <h + t. Thus, in the state where the spacer 6 is interposed between two adjacent ceramic honeycombs 2 in the upper and lower directions, the upper and lower two ceramic honeycombs 2 are arranged on the light receiving surface a side end and the side opposite to the light receiving surface b. Since the end of each can be engaged with the stopper portion 40, the movement in the light receiving surface / anti-light receiving surface direction is prevented and the space s is restrained. On the other hand, when the spacer 6 between the upper and lower ceramic honeycombs 2 is removed, the ceramic honeycomb 2 can be easily taken out from the space s.

The honeycomb support 4 is connected to a support member 8 included in the receiver via a connection member 7. The support member 8 of the present embodiment is configured by a support pipe that is cooled by passing a refrigerant through the inside. This support member (support pipe) is constituted by a part of a heat transfer tube (heat exchanger for recovering heat from the heat transfer medium gas that has passed through the light receiving heat collector 1) provided behind the light receiving heat collector 1. May be.
Brackets 9 project from both end portions of the honeycomb support 4 on the side opposite to the light receiving surface b, and the brackets 9 are formed with insertion holes 10 into which the connecting members 7 are inserted.
6A and 6B show details of the connecting member 7. FIG. 6A is a plan view, and FIG. 6B is a cross-sectional view taken along line VI-VI in FIG. 6A. The connecting member 7 includes a U-shaped main body 70 and an insertion shaft portion 71 connected to both ends of the main body 70 at a right angle. The connecting member 7 is made of heat-resistant metal or ceramic.

The connecting member 7 is configured such that a U-shaped main body 70 is hooked on a support member 8 (support pipe), and the insertion shaft portions 71 at both ends thereof are inserted into the insertion holes 10 of two honeycomb supports 4 adjacent in the horizontal direction. By inserting, the honeycomb support 4 is connected to the support member 8 (support pipe). The connecting member 7 can be removed by extracting the insertion shaft portion 71 from the insertion hole 10. In this way, the honeycomb support 4 is connected to the support member 8 via the connecting member 7, so that the lateral load of the ceramic honeycomb 2, the honeycomb support 4, the column 5, and the spacer 6 is supported via the connecting member 7. Supported by.
The light receiving heat collector 1 of the present embodiment as described above has the honeycomb support 4, the support column 5, the ceramic honeycomb 2, the spacer 6, and the connecting member 7 placed above the receiver lower part (for example, the lower part of the structure part such as the receiver casing). By assembling sequentially toward the surface, it is possible to easily construct the light receiving surface.

  In the heat collecting receiver as described above, when repairing to replace the ceramic honeycomb 2 is performed, only the spacer 6 interposed between the adjacent ceramic honeycombs 2 is removed without removing the honeycomb support 4 and the support column 5. Normally, the spacer 6 is taken out and attached from the side opposite to the light receiving surface b. Thereby, the ceramic honeycomb 2 can be moved in a certain range (for example, about 10 mm) vertically and horizontally, and the ceramic honeycomb 2 adjacent vertically can be taken out from the space s as described above. Become. Therefore, the ceramic honeycomb 2 is taken out and a new ceramic honeycomb 2 is attached (replacement of the ceramic honeycomb 2). Normally, the ceramic honeycomb 2 is taken out and attached from the side opposite to the light receiving surface b. Thereafter, the spacers 6 are attached (inserted) between the adjacent ceramic honeycombs 2, and other spacers 6 are attached as necessary to complete the replacement of the ceramic honeycombs 2.

In a solar thermal power generation facility having a power generation capacity of about 20 MW, the number of ceramic honeycombs constituting the light receiving surface is about 18000, and in the heat collecting receiver including such a large number of ceramic honeycombs, the above repair method includes: This is a useful method for easily exchanging the ceramic honeycomb.
The heat collecting receiver of the present invention is not particularly limited in the configuration other than the light receiving heat collector 1 described above, but as the heat collecting receiver, for example, the light receiving heat collecting body 1 is installed in the opening on the tip side, A casing having an exhaust port on the rear end side, a heat transfer tube (heat exchanger for recovering heat from the heat transfer medium gas that has passed through the light-receiving heat collector 1) disposed inside the casing, and an exhaust port of the casing The thing provided with the exhaust means connected is mentioned.

DESCRIPTION OF SYMBOLS 1 Light-receiving collector 2 Ceramic honeycomb 3 Honeycomb support body 4 Honeycomb support 5 Support column 6 Spacer 7 Connection member 8 Support member 9 Bracket 10 Insertion hole 20 Cell 40 Stopper part 70 Main body 71 Insertion shaft part a, A Photosensitive surface b Anti-light Photosensitive surface s space

Claims (3)

A plurality of ceramic honeycombs (2) are arranged so that the cells (20) that are heat medium gas passages are arranged in parallel, and the light receiving heat collector (1) in which the end face of each ceramic honeycomb (2) constitutes the light receiving surface (a) )
The heat transfer gas was collected on each ceramic honeycomb (2) in the process of flowing from the light receiving surface (a) side to the anti-light receiving surface (b) side through the cells (20) of each ceramic honeycomb (2). In a heat collection receiver that is heated by solar heat,
The equivalent diameter D of each ceramic honeycomb (2) defined by the following formula (1) is 100 mm or more and 150 mm or less, and the shape ratio R of each ceramic honeycomb (2) defined by the following formula (2) is 1.0. 1.5 or less ,
D = 4M / P (1)
R = D / Z (2)
D: Equivalent diameter (mm)
M: Area [mm ² ] of the light receiving surface (a) of the ceramic honeycomb (2)
P: Perimeter of the light receiving surface (a) of the ceramic honeycomb (2) [mm]
R: Shape ratio [-]
Z: distance [mm] between the light receiving surface (a) and the anti-light receiving surface (b) of the ceramic honeycomb (2)
The light receiving heat collecting body (1) includes a honeycomb holding body (3) supported at the lower part of the receiver,
The honeycomb holding body (3) is configured by assembling a lateral honeycomb support (4) and longitudinal struts (5) in a lattice pattern,
In each space (s) corresponding to the grids of the lattice of the honeycomb holder (3), four ceramic honeycombs (2) having two left and right and two upper and lower stages are housed, and adjacent to each other vertically and horizontally. Spacers (6) are interposed between the ceramic honeycombs (2),
The honeycomb support (4) is connected to the support member (8) included in the receiver via the connection member (7).
The end of the honeycomb support (4) on the light-receiving surface (a) side and the end on the anti-light-receiving surface (b) side are connected to the end of the ceramic honeycomb (2) on the light-receiving surface (a) side and the anti-light-receiving surface (b ) Side stoppers are engageable with stoppers (40),
The vertical distance L between the stopper portions (40) of the upper and lower honeycomb supports (4) forming each space (s) and the two ceramic honeycombs (2) adjacent to each other in the upper and lower sides stored in each space (s). The total height h and the thickness t of the spacer (6) interposed between these two ceramic honeycombs (2) satisfy the relationship of L> h and L <h + t, for solar power generation Heat collecting receiver.   The heat collecting receiver for solar power generation according to claim 1, wherein each ceramic honeycomb (2) has a rectangular parallelepiped shape or a prismatic shape, and is composed of silicon carbide ceramics. For the heat collecting receiver according to claim 1 or 2 , when performing repair to replace the ceramic honeycomb (2),
After removing the spacer (6) interposed between the adjacent ceramic honeycombs (2) without removing the honeycomb support (4) and the support (5), the ceramic honeycomb (2) is taken out and a new ceramic honeycomb ( A method of repairing a heat collecting receiver, comprising mounting 2), and then mounting a spacer (6) between adjacent ceramic honeycombs (2) to complete the replacement of the ceramic honeycomb (2).

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