Non-uniform mirror field arrangement method with adjustable light blocking

Abstract

The invention discloses a light-blocking-adjustable non-uniform mirror field arrangement method, and the method comprises the steps: setting a final value of a mirror field ring distance and determining a non-uniform arrangement mode of a mirror field through the calculation of a theoretical ring distance and the calculation of a north-south light-blocking-free ring distance of the mirror field caused by the posture of a heliostat. As the postures of the heliostats in all directions of the heat absorption tower are different, the calculated non-light-blocking-ring spacing values on the south side and the north side of the heat absorption tower are different, and finally the mirror field arrangement mode that the mirror field spacing on the south side and the north side of the heat absorption tower is uneven and gradually changes is determined. Meanwhile, the spacing coefficient of the light-blocking-free rings is set, so that the light-blocking-free arrangement is more flexibly zoomed or enlarged; meanwhile, the left-right distance between the same-ring heliostats of the mirror fields on the south side and the north side is gradually changed from north to south. And finally, no matter the ring spacing or the left-right spacing, the whole mirror field takes the heat absorption tower as a Tai Chi point, and the mirror field is arranged in a south-north non-uniform and gradually-changed manner.

Description

Technical Field

[0001] The present application belongs to the technical field of tower solar power generation, and in particular relates to a method for arranging a non-uniform mirror field with adjustable light blocking. Background Art

[0002] As a technology for efficient use of solar energy, tower solar concentrator system has developed rapidly in recent years. This system uses a large number of heliostats arranged on the ground to focus sunlight onto the absorber on the top of the tower, in this way converting solar radiation energy into thermal energy, which is then converted into electrical energy or other forms of energy through a thermal energy conversion system for human use.

[0003] The design and optimization of the concentrated solar collector system is related to the efficiency and economy of the entire solar thermal power station, among which the economic investment in the mirror field accounts for about 40%, so the mirror field layout design is very necessary.

[0004] At present, in tower-type CSP power stations, the traditional arrangement of mirror fields for cylindrical absorbers is usually annular symmetrical arrangement. The so-called symmetry means that the spacing between the east, west, south, north and left and right rings of the same ring of heliostats is equal, and the radial distance from the tower is equal. At the same time, the layout of the mirror field needs to be measured by the optical efficiency of the mirror field, and the optical efficiency of the mirror field is composed of cosine efficiency, atmospheric transmission efficiency, truncation efficiency, shadow and occlusion efficiency, and reflection efficiency. The optical efficiency distribution of heliostats located at different positions in the mirror field is different. The cosine efficiency of the mirror field on the north side is higher, while the south side is the opposite. Since the sun is on the south side of the tower, the heliostats on the north side of the mirror field are mostly upright, and the angle between the normal of the heliostat and the ground is low, while the heliostats on the south side are mostly lying, and the angle between the normal of the heliostat and the ground is large, and even the normal elevation angle of the mirror surface can reach 90°, which leads to greater light blocking loss in the north mirror field than in the south mirror field.

[0005] If the spacing between heliostats in the mirror field is large, resulting in an overly large area for the entire mirror field, the shadow light blocking efficiency will be increased accordingly, but the cosine efficiency, truncation efficiency, and atmospheric transmission efficiency will suffer certain losses; while the mirror field area is too small, although the cosine efficiency, truncation efficiency, and atmospheric transmission efficiency are increased, the shadow light blocking efficiency will be reduced accordingly. Since the position of the sun in the sky is constantly moving, the posture of the heliostats is also constantly changing, resulting in constant changes in the cosine efficiency, shadow efficiency, light blocking efficiency, and truncation efficiency, especially the cosine efficiency and shadow efficiency, which change the most with the change of the sun angle. Usually, when the solar altitude angle is high, the cosine efficiency is high, the shadow efficiency is nearly 100% (that is, no shadow loss occurs), and the light blocking efficiency changes the least with the continuous change of the sun angle, and the value is the most stable. However, what usually affects the light blocking efficiency is the spacing of the heliostats. Even in the most compact mirror field, the shadow efficiency may reach 100%, while the light blocking efficiency changes greatly with the distance between the heliostats.

[0006] Usually, when designing a mirror field, it is necessary to take into account the above five optical efficiency parameters to optimize the mirror field layout. However, if all of them are considered uniformly, a large amount of optimization calculations will be consumed, and the optimization results at different times will be different. The traditional arrangement of the mirror field without light obstruction is only done by staggering the heliostats and spacing the mirror field rings away from the tower in the same way. This will cause the loss of truncation efficiency and cosine efficiency for the heliostat ring on the south side of the tower in the northern hemisphere tower-type solar thermal mirror field, thereby further reducing the optical efficiency of the entire mirror field. Summary of the invention

[0007] The purpose of this application is to overcome the problems of the prior art and disclose a non-uniform mirror field arrangement method with adjustable light blocking. This application adopts a non-uniform arrangement method for the arrangement density of the north and south mirror fields by setting and adjusting the non-light blocking distance and the light blocking factor according to different north and south regions. It can better utilize the optical efficiency of the mirror field, and can take into account the cosine efficiency and shadow light blocking efficiency, which is more flexible for mirror field optimization; at the same time, in the case of limited space, the mirror field layout requirements of the limited space can be matched by flexibly adjusting the light blocking factor and adjusting the non-uniform arrangement angle of the north and south mirror fields.

[0008] The purpose of this application is achieved through the following technical solutions:

[0009] A method for arranging a non-uniform mirror field with adjustable light blocking, the method comprising the following steps:

[0010] S1: Calculate the solar altitude angle α at the design point according to the longitude and latitude of the project site;

[0011] S2: Set the radius R1 and the left and right spacing DM of the first ring heliostat;

[0012] S3: By arranging in a staggered manner, the layout distance relationship between the second - ring heliostats and two adjacent heliostats in the first ring forms an equilateral triangle, and calculate the ring - to - ring spacing ΔR between the second - ring heliostats and the first - ring heliostats cal , the distance between the third - ring heliostats and the adjacent heliostats in the second ring = the distance between the fourth - ring heliostats and the adjacent heliostats in the third ring = DM;

[0013] Meanwhile, set the safety ring - to - ring spacing R of the mirror field safe , when the calculated ring - to - ring spacing ΔR cal <R safe , the ring - to - ring spacing = R safe , and finally obtain the theoretical ring - to - ring spacing ΔR0 of each ring;

[0014] S4: According to the solar altitude angle α at the design - point moment and the current motion attitude of the heliostats, calculate the non - shading distance ΔR between the adjacent heliostats in the front and back of each ring. Meanwhile, a non - shading coefficient can be set to adjust the ring - to - ring spacing ΔR of the heliostats n = ΔR·s, where 0 < s < 2 and ΔR n > R safe ;

[0015] S5: If the ring - to - ring spacing ΔR of the heliostats n <ΔR0, then the ring - to - ring spacing of the corresponding ring is ΔR0. If ΔR n >ΔR0, then the ring - to - ring spacing of the corresponding ring is ΔR n .

[0016] According to a preferred embodiment, step S3 specifically includes:

[0017] When ΔR cal <R safe , then ΔR0 = R safe , and at this time, the theoretical ring - to - ring spacing ΔR0 of each ring is the fixed value R safe ;

[0018] When ΔR cal > R safe , then ΔR0 = ΔR cal , and at this time, the theoretical ring - to - ring spacing ΔR0 of each ring is the variable value ΔR cal .

[0019] According to a preferred embodiment, in step S4, the calculation result of the non - shading distance ΔR is determined based on the structural shape and motion mode of the heliostats.

[0020] According to a preferred embodiment, in step S4, according to the difference in the non - shading ring - to - ring spacing of the mirror fields on the north and south sides of the solar receiver, when the non - shading ring - to - ring spacing is greater than the theoretical ring - to - ring spacing, that is, ΔR n>R0, the different heliostat rings in the mirror field present the characteristics of non-concentric north-south non-uniform arrangement.

[0021] According to a preferred embodiment, step S5 further includes, when the mirror field is in the northern hemisphere,

[0022] When arranging the mirror field, the unobstructed light distance ΔR between each ring on the north side of the mirror field is multiplied by a unobstructed light coefficient s to reduce or increase the unobstructed light distance of the mirror field on the north side. At the same time, the unobstructed light distance ΔR between each ring on the south side of the mirror field is divided by a unobstructed light coefficient s to increase or reduce the unobstructed light distance of the mirror field on the south side.

[0023] According to a preferred embodiment, step S5 further includes, when the mirror field is in the northern hemisphere,

[0024] When arranging the mirror field, the arrangement angles of each ring of heliostats in the mirror field are set non-uniformly: the left-right spacing of the heliostats on the north side is smaller or larger than the left-right spacing of the heliostats on the south side, and the adjacent arrangement angles change equidistantly from north to south.

[0025] According to a preferred embodiment, when the mirror field is in the northern hemisphere, if the mirror field boundary is limited, resulting in a decrease in the number of heliostats on the south side, and the wall temperature on the south side of the heat absorption tower is lower than the preset temperature,

[0026] The heliostats on the south side of the heat absorption tower are densely arranged, including: reducing the heliostat ring spacing on the south side by the light blocking distance, and / or arranging the mirror field in a manner of densely arranging the mirror field on the south side by reducing the south side arrangement angle.

[0027] According to a preferred embodiment, step S5 further includes, when the mirror field is in the southern hemisphere,

[0028] When arranging the mirror field, the unobstructed light distance ΔR between each ring on the south side of the mirror field is multiplied by a unobstructed light coefficient s to reduce or increase the unobstructed light distance of the mirror field on the south side. At the same time, the unobstructed light distance ΔR between each ring on the north side of the mirror field is divided by a unobstructed light coefficient s to increase or reduce the unobstructed light distance of the mirror field on the north side.

[0029] According to a preferred embodiment, step S5 further includes, when the mirror field is in the southern hemisphere,

[0030] When arranging the mirror field, the arrangement angles of each ring of heliostats in the mirror field are set non-uniformly: the left-right spacing of the heliostats on the south side is smaller or larger than the left-right spacing of the heliostats on the north side, and the adjacent arrangement angles change equidistantly from south to north.

[0031] According to a preferred embodiment, when the mirror field is in the southern hemisphere, such as the mirror field boundary limit, resulting in a decrease in the number of heliostats on the north side, and the north wall temperature of the heat absorption tower is lower than the preset temperature,

[0032] The heliostats on the north side of the heat absorption tower are densely arranged, including: reducing the heliostat ring spacing on the north side by the light blocking distance, and / or arranging the mirror field in a manner of densely arranging the mirror field on the south side by reducing the north side arrangement angle.

[0033] The aforementioned main scheme of the present application and its further options can be freely combined to form multiple schemes, all of which are schemes that can be adopted and claimed for protection in the present application. After understanding the scheme of the present application, those skilled in the art can understand that there are multiple combinations based on the prior art and common knowledge, all of which are technical schemes to be protected by the present application, and they are not exhaustively listed here.

[0034] Beneficial effects of this application:

[0035] 1. The mirror field arrangement method mentioned in the present invention calculates the light-blocking distance of the heliostat at the design point, and arranges the mirror field with different light-blocking distances on the north and south sides (and different arrangement densities of the north and south mirror fields), so that the overall mirror field has a lower light-blocking loss.

[0036] 2. By arranging the spacing without blocking the light and arranging the heliostats in the same ring with a gradual change in the arrangement angle, the mirror field layout presents a non-uniform arrangement from north to south. The non-uniform arrangement means: the ring spacing is non-uniform from north to south; the mirror field arrangement angle is non-uniform. This method can adjust the proportion of the mirror field cosine efficiency, the distribution of the absorber energy flux density, etc., which brings a certain degree of flexibility to the performance requirements of the mirror field.

[0037] 3. By adjusting the light blocking coefficient, the layout range of the mirror field can be scaled to adapt to mirror fields with different performance requirements and site requirements.

[0038] 4. For polygonal heliostats (number of sides ≥ 5), set a non-light-blocking distance, which is more friendly to the area occupied by the mirror field. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the traditional staggered arrangement of the mirror field of this application;

[0040] FIG2( a ) is a schematic diagram of the light blocking of the heliostat on the north side of the heat absorption tower in the northern hemisphere;

[0041] FIG2( b ) is a schematic diagram of the light blocking of the heliostat on the south side of the heat absorption tower in the northern hemisphere;

[0042] Figure 3 (a) shows the viewing angle from the absorber end to the heliostat under investigation, showing the non-light-blocking effect of the rectangular heliostat;

[0043] Figure 3(b) shows the viewing angle from the absorber end to the heliostat under investigation, showing the non-blocking effect of the pentagonal heliostat;

[0044] Figure 4 This is a schematic diagram of the change of the unobstructed light distance from north to south in the mirror field;

[0045] Figure 5 This is a schematic diagram of the uneven arrangement of the layout angles on the north side;

[0046] Figure 6 This is a schematic diagram of the uneven arrangement of the layout angles on the south side;

[0047] FIG7( a ) is a schematic diagram of an arrangement in which the arrangement angle gradually decreases from north to south and the spacing between the non-blocking light rings is uneven;

[0048] FIG7( b ) is a schematic diagram of an arrangement in which the arrangement angle gradually increases from north to south and the spacing between the unblocked light rings is uneven. DETAILED DESCRIPTION

[0049] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0050] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0051] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0052] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0053] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0054] In addition, the present application would like to point out that, in the present application, unless the specific structure, connection relationship, positional relationship, power source relationship, etc. are specifically written out, the structure, connection relationship, positional relationship, power source relationship, etc. involved in the present application are all known by those skilled in the art on the basis of the prior art without creative work.

[0055] The present application discloses a light-blocking adjustable non-uniform mirror field arrangement method, and the non-uniform mirror field arrangement method comprises the following steps.

[0056] Step S1: Calculate the solar altitude angle α at the design point according to the longitude and latitude of the project site. Generally, the solar noon is selected as the design point time.

[0057] Step S2: setting the radius R1 and the left-right distance DM of the first circular heliostat.

[0058] Step S3: By staggered arrangement, the arrangement distance between the heliostats in the second ring and the two adjacent heliostats in the first ring forms an equilateral triangle, such as Figure 1 As shown, the ring spacing ΔR between the second ring heliostat and the first ring heliostat is calculated. cal The distance between the third ring heliostat and the adjacent heliostat in the second ring = the distance between the fourth ring heliostat and the adjacent heliostat in the third ring = DM.

[0059] At the same time, set the mirror field safety ring spacing R safe , when the calculated ring spacing ΔR cal <R safe When the ring spacing = R safe , and finally the theoretical ring spacing ΔR0 of each ring is obtained.

[0060] That is, when ΔR cal <R safe When ΔR0=R safe , at this time, the theoretical ring spacing ΔR0 of each ring is a fixed value R safe ; When ΔR cal >Rs afe When ΔR0=ΔR cal , at this time, the theoretical ring spacing ΔR0 of each ring is the change value ΔR cal .

[0061] S4: According to the solar altitude angle α at the design point moment, and based on the current motion posture of the heliostat, calculate the non-shading distance ΔR between adjacent heliostats in each ring. Meanwhile, a non-shading coefficient can be set to adjust the distance ΔR between heliostat rings. n = ΔR·s, where 0 < s < 2, and ΔR n > R safe .

[0062] Preferably, in step S4, the calculation result of the non-shading distance ΔR is determined based on the structural shape and motion mode of the heliostat.

[0063] Specifically, according to the solar altitude angle at the design point moment, assuming that the solar rays are parallel incident light, calculate the non-shading distance ΔR between adjacent heliostats in each ring at this time. The calculation basis is shown in Figure 2. The solar parallel rays reflected by the current posture of the rear-row heliostats will not be blocked by the current posture of the front-row heliostats. During the calculation process, the staggered arrangement between the front and rear heliostats should be considered, that is: the shading distance should consider the shape of the heliostat and the staggered gap of the heliostats after staggering, so as to calculate the non-shading distance ΔR. In order to make the ring spacing more flexible, a non-shading coefficient s can be set so that the finally calculated distance ΔR between heliostat rings n = ΔR·s, where 0 < s < 2, and ΔR n > R safe .

[0064] The heliostat is usually of a polygonal structure, commonly such as a quadrilateral, pentagon or circle, etc. The calculation method of the non-shading distance varies with the number of sides and motion mode of the heliostat. See Figure 3(a) , 3(b) , Figure 3(a) , 3(b) . The viewing angle of

[0065] Step S5: If the distance ΔR between heliostat rings n < ΔR0, then the ring spacing of the corresponding ring is ΔR0. If ΔR n > ΔR0, then the ring spacing of the corresponding ring is ΔR n .

[0066] Generally, the shading distance condition of the heliostats in the near-tower area satisfies: ΔR n < ΔR0. Therefore, in the mirror field of the near-tower area, whether on the south side or the north side of the absorber tower, the arrangement method of keeping the ring spacing as the theoretical ring spacing ΔR0 is always maintained.

[0067] When the mirror field is in the Northern Hemisphere, when the heliostats gradually move away from the absorber tower, for the heliostats located on the north side of the heliostats, the non-shading ring spacing and the theoretical ring spacing gradually show ΔR n>ΔR0, and because the south heliostat is in a nearly horizontal position, the law of the unobstructed light ring spacing and the theoretical ring spacing is still: ΔR n <ΔR0.

[0068] Therefore, when arranging the mirror field, the mirror field arrangement angle is kept the same. According to the situation that the unobstructed light spacing is larger on the north side of the mirror field and smaller on the south side, the north and south sides of the mirror field are arranged unevenly, that is, the spacing between the mirror field rings on the south side is smaller and the spacing between the mirror field rings on the north side is larger. Figure 4 This also makes the mirror field on the south side of the tower more concentrated in the area with higher cosine efficiency. However, the premise is that the safety ring spacing R between adjacent rings of heliostats is maintained. safe , no interference collision between any adjacent heliostats is allowed.

[0069] Specifically, step S5 also includes that when the mirror field is in the northern hemisphere, the mirror field on the north side of the heat absorption tower may be slightly expanded due to the setting of the light-free distance during the arrangement of the mirror field, thereby causing further loss of cosine loss. This can be adjusted in two ways: (1) multiplying the light-free distance ΔR between each ring on the north side of the mirror field by a light-free coefficient s. In this case, 0 < s < 1. Reduce the unobstructed distance of the north mirror field. At the same time, divide the unobstructed distance ΔR between the rings on the south side of the mirror field by a unobstructed coefficient s to increase the unobstructed distance of the south mirror field. (2) When arranging the mirror field, the arrangement angles of each ring of heliostats in the mirror field are set non-uniformly: the left-right spacing of the north heliostats is smaller than that of the south heliostats, and the adjacent arrangement angles change equidistantly from north to south, such as Figure 5 shown.

[0070] Furthermore, when the mirror field is in the northern hemisphere, if the boundary of the mirror field is limited, resulting in a decrease in the number of heliostats on the south side, and the wall temperature on the south side of the heat absorption tower is lower than a preset temperature, the heliostats on the south side of the heat absorption tower are densely arranged, including: reducing the heliostat ring spacing on the south side by blocking the light distance, and / or arranging the mirror field in a manner of encrypting the mirror field on the south side by reducing the south side arrangement angle, such as Figure 6 As shown. In the process of uniform arrangement from north to south, the relationship between the arrangement angles of any two adjacent heliostats is as follows: A1-A2=A2-A3, that is, the north-south uneven arrangement of heliostats in the same ring is arranged in a gradual manner according to the arrangement angle, and any adjacent arrangement angles are different, and decrease from large arithmetic differences, or increase from small arithmetic differences.

[0071] Finally, a mirror field is formed where the mirror field near the tower is evenly distributed in the north-south direction, the light-blocking distance between the ring spacings of the far-tower mirror field is adjustable, and the mirror field is unevenly arranged in the north-south direction. There are the following two ways of this north-south uneven arrangement: ① According to the calculation of the non-light-blocking distance, the ring spacing on the south side is smaller than that on the north side. For the heliostats in the same ring, the arrangement angle of the heliostats on the north side is greater than that of the heliostats on the south side, and from north to south, the arrangement angles decrease gradually in an arithmetic progression; ② According to the calculation of the non-light-blocking distance, the ring spacing on the south side is smaller than that on the north side. For the heliostats in the same ring, the arrangement angle of the heliostats on the south side is greater than that of the heliostats on the north side, and from north to south, the arrangement angles increase gradually in an arithmetic progression. As Figure 7(a) and 7(b) shown: In the figure, the arrangement angle A1 > A2.

[0072] Correspondingly, step S5 also includes that when the mirror field is in the southern hemisphere, when arranging the mirror field, due to the setting of the non-light-blocking distance, it may cause the mirror field on the south side of the absorber tower to expand slightly, resulting in cosine loss. It can be adjusted in two ways: (1) Multiply the non-light-blocking distance ΔR between each ring on the south side of the mirror field by a non-light-blocking coefficient s, where 0 < s < 1 at this time, to reduce the non-light-blocking distance of the south-side mirror field. At the same time, divide the non-light-blocking distance ΔR between each ring on the north side of the mirror field by a non-light-blocking coefficient s to increase the non-light-blocking distance of the north-side mirror field. (2) When arranging the mirror field, the arrangement angles of the heliostats in each ring of the mirror field are set unevenly: the left-right spacing of the heliostats on the south side is smaller than that of the heliostats on the north side, and from south to north, the adjacent arrangement angles change in an arithmetic progression.

[0073] Furthermore, when the mirror field is in the southern hemisphere, if the number of heliostats on the north side decreases due to the mirror field boundary limitation and the temperature of the north side wall of the absorber tower is lower than the preset temperature, then the heliostats on the north side of the absorber tower are encrypted, including: arranging the mirror field by reducing the ring spacing of the heliostats on the north side through the light-blocking distance, and / or by reducing the arrangement angle on the north side to encrypt the south-side mirror field.

[0074] Embodiment

[0075] When arranging the mirror field for a certain northern hemisphere project, since the non-light-blocking ring spacing ΔR of the mirror field near the tower < ΔR0, and due to the mirror field operation and maintenance relationship, it is considered that the set safety ring spacing of the mirror field is 7 meters, and the relationship between the non-light-blocking ring spacing in the near-tower area, the theoretical ring spacing, and the minimum safety ring spacing always satisfies: ΔR < ΔR0 < 7 or ΔR < 7 < ΔR0. Therefore, the mirror field in the near-tower area can be arranged evenly throughout the field: the north-south ring spacing and the left-right spacing are the same.

[0076] When the mirror field gradually moves away from the heat absorption tower, the unobstructed light ring spacing on the north side of the heat absorption tower is larger than the theoretical ring spacing (ΔR0<ΔR), while the unobstructed light ring spacing on the south side of the heat absorption tower is still smaller than the theoretical ring spacing (ΔR<ΔR0). Therefore, on the north side of the heat absorption tower, the mirror field ring spacing is kept at the unobstructed light distance (or the unobstructed light distance is multiplied by a coefficient to slightly reduce the unobstructed light ring spacing, but it cannot be lower than the theoretical ring spacing), while the ring spacing of the heliostats in the same ring on the south side still maintains the theoretical ring spacing. At this time, the ring spacing on the north side of the ring is already larger than the ring spacing on the south side.

[0077] When the arrangement continues toward the far tower, the unobstructed light ring spacing of the north and south heliostats may be greater than the theoretical ring spacing (ΔR0<ΔR). At this time, the unobstructed light ring spacing (or the unobstructed light ring spacing multiplied by a certain coefficient) can be used to make the north and south ring spacings of the far tower area of ​​the heat absorption tower unevenly arranged.

[0078] During the design of this project, since the heat absorption tower has been fixed and the land area on the south side of the heat absorption tower is limited, the uniform arrangement of the mirror field may cause the temperature on the north side of the heat absorption device to be too high and the temperature on the south side to be too low. Therefore, not only is the mirror field densely arranged through the south ring spacing, but the mirror field on the south side is also densely arranged at an angle, so that the entire mirror field is arranged unevenly from north to south. Ultimately, the far-tower area of ​​the entire mirror field is a non-uniform mirror field, and the arrangement angle of the non-uniform part of the mirror field is gradually reduced from north to south, which ultimately ensures the energy flow density on the south side of the heat absorption tower.

[0079] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A method for arranging a non-uniform mirror field with adjustable light blocking, characterized in that: The non-uniform mirror field arrangement method comprises the following steps: S1: Calculate the solar altitude angle α at the design point according to the longitude and latitude of the project site; S2: Set the radius R1 and the left-right spacing DM of the first ring heliostat; S3: Through staggered arrangement, the arrangement distance relationship between the second ring heliostat and the two adjacent heliostats in the first ring is an equilateral triangle, and the ring spacing ΔR between the second ring heliostat and the first ring heliostat is calculated. cal , the distance between the third ring heliostat and the adjacent heliostat in the second ring = the distance between the fourth ring heliostat and the adjacent heliostat in the third ring = DM; At the same time, set the mirror field safety ring spacing R safe , when the calculated ring spacing ΔR cal <R safe When the ring spacing = R safe , and finally the theoretical ring spacing ΔR0 of each ring is obtained; S4: According to the solar altitude angle α at the design point moment, and based on the current motion posture of the heliostat, calculate the non-shading distance ΔR between the adjacent front and rear heliostats in each ring. Meanwhile, set a non-shading coefficient to adjust the distance ΔR between the heliostat rings n = ΔR·s, where 0 < s < 2, and ΔR n > R safe ; S5: If the distance between the heliostat rings is ΔR n <ΔR0, the ring spacing of the corresponding ring is ΔR0. If ΔR n >ΔR0, then the distance between the corresponding rings is ΔR n .

2. The non-uniform mirror field arrangement method according to claim 1, characterized in that: Step S3 specifically includes: When ΔR cal <R safe When ΔR0=R safe , at this time, the theoretical ring spacing ΔR0 of each ring is a fixed value R safe ; When ΔR cal >R safe When ΔR0=ΔR cal , at this time, the theoretical ring spacing ΔR0 of each ring is the change value ΔR cal .

3. The non-uniform mirror field arrangement method according to claim 1, characterized in that: In step S4, the calculation result of the unblocked distance ΔR is determined based on the structure shape and movement mode of the heliostat.

4. The non-uniform mirror field arrangement method according to claim 1, characterized in that: In step S4, according to the difference in the unobstructed light ring spacing between the mirror fields on the north and south sides of the heat absorption tower, when the unobstructed light ring spacing is greater than the theoretical ring spacing, that is, ΔR n >R0, the different heliostat rings in the mirror field present the characteristics of non-concentric north-south non-uniform arrangement.

5. The non-uniform mirror field arrangement method according to claim 1, characterized in that: Step S5 also includes, when the mirror field is in the northern hemisphere, When arranging the mirror field, the unobstructed light distance ΔR between each ring on the north side of the mirror field is multiplied by a unobstructed light coefficient s to reduce or increase the unobstructed light distance of the mirror field on the north side. At the same time, the unobstructed light distance ΔR between each ring on the south side of the mirror field is divided by a unobstructed light coefficient s to increase or reduce the unobstructed light distance of the mirror field on the south side.

6. The method for arranging a non-uniform mirror field according to claim 4, characterized in that: Step S5 also includes, when the mirror field is in the northern hemisphere, When arranging the mirror field, the arrangement angles of each ring of heliostats in the mirror field are set non-uniformly: the left-right spacing of the heliostats on the north side is smaller or larger than the left-right spacing of the heliostats on the south side, and the adjacent arrangement angles change equidistantly from north to south.

7. The method for arranging a non-uniform mirror field according to claim 4, characterized in that: When the mirror field is in the northern hemisphere, if the boundary of the mirror field is limited, resulting in a decrease in the number of heliostats on the south side, and the wall temperature on the south side of the heat absorption tower is lower than the preset temperature, The heliostats on the south side of the heat absorption tower are densely arranged, including: reducing the heliostat ring spacing on the south side by the light blocking distance, and / or arranging the mirror field in a manner of densely arranging the mirror field on the south side by reducing the south side arrangement angle.

8. The non-uniform mirror field arrangement method according to claim 1, characterized in that: Step S5 also includes, when the mirror field is in the southern hemisphere, When arranging the mirror field, the unobstructed light distance ΔR between each ring on the south side of the mirror field is multiplied by a unobstructed light coefficient s to reduce or increase the unobstructed light distance of the mirror field on the south side. At the same time, the unobstructed light distance ΔR between each ring on the north side of the mirror field is divided by a unobstructed light coefficient s to increase or reduce the unobstructed light distance of the mirror field on the north side.

9. The method for arranging a non-uniform mirror field according to claim 7, characterized in that: Step S5 also includes, when the mirror field is in the southern hemisphere, When arranging the mirror field, the arrangement angles of each ring of heliostats in the mirror field are set non-uniformly: the left-right spacing of the heliostats on the south side is smaller or larger than the left-right spacing of the heliostats on the north side, and the adjacent arrangement angles change equidistantly from south to north.

10. The method for arranging a non-uniform mirror field according to claim 7, characterized in that: When the mirror field is in the southern hemisphere, if the boundary of the mirror field is limited, resulting in a decrease in the number of heliostats on the north side, and the north wall temperature of the heat absorption tower is lower than the preset temperature, The heliostats on the north side of the heat absorption tower are densely arranged, including: reducing the heliostat ring spacing on the north side by the light blocking distance, and / or arranging the mirror field in a manner of densely arranging the mirror field on the south side by reducing the north side arrangement angle.

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