A method for adjusting non-uniform mirror field

Abstract

The application discloses a light-blocking adjustable non-uniform mirror field arrangement method, which sets the final value of the mirror field ring spacing and determines the non-uniform arrangement mode of the mirror field through the calculation of the theoretical ring spacing and the calculation of the north-south non-blocking ring spacing caused by the heliostat posture. Due to the different heliostat postures of the heat absorption tower in each direction, the calculated non-blocking ring spacing values are different on the south and north sides of the heat absorption tower, and finally a mirror field arrangement mode is determined, in which the mirror field ring spacing on the south and north sides of the heat absorption tower is non-uniform and gradually changes. At the same time, the non-blocking ring spacing coefficient is set, so that the non-blocking arrangement can be flexibly scaled or expanded. At the same time, the left and right spacings of the same ring heliostat on the south and north sides of the mirror field gradually change from north to south. Finally, whether it is the ring spacing or the left and right spacing, the whole mirror field takes the heat absorption tower as the Taiji point, and the arrangement mode of the mirror field on the south and north sides is non-uniform and gradually changes.

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] Tower-type solar concentrating solar systems, as a technology for efficiently utilizing solar energy, have seen rapid development in recent years. These systems use a large number of heliostats arranged on the ground to focus sunlight onto a heat receiver at the top of the tower. This converts solar radiation into heat, which is then converted into electricity or other forms of energy through a heat conversion system for human use.

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

[0004] Currently, the traditional arrangement of heliostats for cylindrical receivers in tower-type CSP plants is typically circularly symmetrical. Symmetry means that within a ring, the spacing between heliostats is equal, both in the east, west, south, and north directions, and also in the left and right directions, and their radial distances from the tower are equal. The quality of a field's layout is also measured by its optical efficiency, which is composed of cosine efficiency, atmospheric transmission efficiency, cutoff efficiency, shadowing and obstruction efficiency, and reflection efficiency. Heliostats located at different locations in the field have varying optical efficiency distributions. Mirrors located in the north have higher cosine efficiency, while those in the south have the opposite. Because the sun is south of the tower, heliostats on the north side of the field are often positioned upright, with a lower angle between their normal and the ground. Heliostats on the south side are often positioned horizontally, with a larger angle between their normal and the ground, sometimes reaching 90°. This results in greater light blocking losses in the north than in the south.

[0005] If the mirror field arrangement spacing is large, the overall mirror field area is too large, which will correspondingly improve the shadow light blocking efficiency, but the cosine efficiency, the truncation efficiency and the atmospheric transmission efficiency will be lost; while the mirror field area is too small, although the cosine efficiency, the truncation efficiency and the atmospheric transmission efficiency are improved, the shadow light blocking efficiency will be reduced accordingly. Since the position of the sun in the sky is constantly moving, the attitude of the heliostat is also constantly changing, resulting in the continuous change of the cosine efficiency, the shadow efficiency, the light blocking efficiency and the truncation efficiency, especially the cosine efficiency and the shadow efficiency, which change the most with the change of the sun angle. Usually, when the sun elevation angle is high, the cosine efficiency is high, the shadow efficiency is close to 100% (i.e. no shadow loss), and the light blocking efficiency changes the least with the change of the sun angle, and the value is the most stable. But the arrangement spacing of the heliostat usually affects the light blocking efficiency, even if the mirror field is compact, the shadow efficiency may reach 100%, but the light blocking efficiency changes greatly with the distance between the heliostats.

[0006] Usually, when designing a mirror field, the above five optical efficiency parameters need to be considered for mirror field layout optimization. Considering all these factors at the same time will consume a lot of optimization calculation, and the optimization results at different times are not the same. The traditional non-blocking mirror field arrangement is only through the staggered arrangement of heliostats and the arrangement of mirror field ring spacing away from the tower position according to the same rule, which causes 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 light and heat mirror field, thereby further reducing the optical efficiency of the whole mirror field. SUMMARY

[0007] The purpose of the present application is to overcome the problems of the prior art, and a light-blocking adjustable non-uniform mirror field arrangement method is disclosed. The arrangement density of the north and south mirror fields is arranged in a non-uniform manner by setting and adjusting the mirror field arrangement distance according to the non-blocking distance and the light-blocking factor in the north and south regions. The optical efficiency of the mirror field can be better utilized, and the cosine efficiency and the shadow light blocking efficiency can be considered, and the mirror field optimization is more flexible; at the same time, in the case of limited site, the light-blocking factor and the non-uniform arrangement angle of the north and south mirror fields are adjusted to match the mirror field layout requirements of the limited site.

[0008] The purpose of the present application is achieved by the following technical solutions:

[0009] A light-blocking adjustable non-uniform mirror field arrangement method, the non-uniform mirror field arrangement method comprising the following steps:

[0010] S1: calculating the sun elevation angle a at the design point according to the latitude and longitude of the project site;

[0011] S2: setting the radius R1 and the left-right spacing DM of the first ring of heliostats;

[0012] S3: By staggering the arrangement, the distance between the second ring heliostats and the two adjacent heliostats in the first ring forms an equilateral triangle. Calculate the ring spacing ΔR between the second ring heliostats and the first ring heliostats. cal , the distance between the third ring heliostat and the adjacent second ring heliostat = the distance between the fourth ring heliostat and the adjacent third ring heliostat = DM;

[0013] 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;

[0014] S4: Based on the solar altitude angle α at the design point and the current motion posture of the heliostat, the unobstructed distance ΔR between the adjacent heliostats in front and behind each ring is calculated. At the same time, a unobstructed coefficient can be set to adjust the distance ΔR between the heliostat rings. n =ΔR·s, where 0 <s<2,且ΔR n >R safe ;

[0015] S5: If the distance between heliostat rings ΔR 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 .

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

[0017] 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 ;

[0018] 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 .

[0019] According to a preferred embodiment, in step S4, the calculation result of the unblocked distance ΔR is determined based on the structural shape and movement mode of the heliostat.

[0020] According to a preferred embodiment, 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 nWhen R0, the heliostat rings in different mirror fields 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 distance ΔR between each ring on the north side of the mirror field is multiplied by a unobstructed coefficient s to reduce or increase the unobstructed distance of the north side mirror field. At the same time, the unobstructed distance ΔR between each ring on the south side of the mirror field is divided by a unobstructed coefficient s to increase or reduce the unobstructed distance of the south side mirror field.

[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 the heliostats in each ring of the mirror field are set unevenly: 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 south wall temperature 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 packed, including: reducing the heliostat ring spacing on the south side by blocking the light distance, and / or arranging the mirror field on the south side by narrowing the south side arrangement angle to densely pack the mirror field.

[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 distance ΔR between the rings on the south side of the mirror field is multiplied by a unobstructed coefficient s to reduce or increase the unobstructed distance of the mirror field on the south side. At the same time, the unobstructed distance ΔR between the rings on the north side of the mirror field is divided by a unobstructed coefficient s to increase or reduce the unobstructed 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 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 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 packed, including: reducing the heliostat ring spacing on the north side by blocking the light distance, and / or arranging the mirror field in a manner of densely packing the mirror field on the south side by reducing the arrangement angle on the north side.

[0033] The aforementioned main solution of this application and its further options can be freely combined to form multiple solutions, all of which can be adopted and protected by this application. After understanding the solution of this application, those skilled in the art will understand that there are many combinations based on existing technology and common knowledge, all of which are technical solutions to be protected by this application, and these are not exhaustive here.

[0034] Beneficial effects of this application:

[0035] 1. The mirror field layout method mentioned in the present invention calculates the unobstructed light distance of the heliostats at the design time, and arranges the mirror field with different unobstructed light distances on the north and south sides (and different mirror field layout densities in the north and south), so that the overall mirror field has low light blocking loss.

[0036] 2. By using unobstructed spacing and a gradual shift in the angles of the heliostats within a ring, the mirror field can be arranged in a non-uniform pattern from north to south. This non-uniform pattern refers to non-uniform spacing between the rings and non-uniform angles of the mirror field. This method can adjust the proportion of cosine efficiency in the field and the distribution of the absorber energy flux density, providing flexibility in adjusting 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 light-free distance to be more user-friendly to the mirror field area. 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] Figure 2(a) is a schematic diagram of the heliostat blocking light on the north side of the heat absorption tower in the northern hemisphere;

[0041] Figure 2(b) is a schematic diagram of the heliostat blocking light on the south side of the heat absorption tower in the northern hemisphere;

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

[0043] Figure 3(b) shows the perspective from the absorber end to the heliostat under investigation, showing the no-light-blocking effect of the pentagonal heliostat;

[0044] Figure 4 This is a schematic diagram of the change of the unobstructed light distance between the north and south of 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] Figure 7(a) is a schematic diagram of an arrangement in which the arrangement angle gradually decreases from north to south and the spacing between the unblocked 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. Those skilled in the art can easily understand the other advantages and effects of the present application from the content disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed 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 unless they 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, it does not need to be further defined or explained in subsequent drawings.

[0051] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended only to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0052] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0053] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0054] In addition, the present application would like to point out that, in the present application, unless the specific structures, connection relationships, positional relationships, power source relationships, etc. are specifically written out, the structures, connection relationships, positional relationships, power source relationships, etc. involved in the present application are all known to those skilled in the art based on the existing technology without creative work.

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

[0056] Step S1: Calculate the solar altitude angle α at the design point based on the longitude and latitude of the project site. Generally, 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 staggering the arrangement, the distance between the heliostats in the second ring and the two adjacent heliostats in the first ring forms an equilateral triangle, as shown in FIG. 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 second ring heliostat = the distance between the fourth ring heliostat and the adjacent third ring heliostat = 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: Based on the solar altitude angle α at the design point and the current motion posture of the heliostat, the unobstructed distance ΔR between the adjacent heliostats in front and behind each ring is calculated. At the same time, a unobstructed coefficient can be set to adjust the distance ΔR between the heliostat rings. n =ΔR·s, where 0 <s<2,且ΔR n >R safe .

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

[0063] Specifically, based on the solar altitude angle at the design point, assuming that the incident sunlight is parallel, the unobstructed distance ΔR between the adjacent heliostats in front and behind each ring is calculated. The calculation basis is shown in Figure 2. The parallel sunlight reflected by the current posture of the rear heliostat will not be blocked by the current posture of the front heliostat. In the calculation process, the staggered arrangement between the front and rear heliostats should be considered, that is, the light-blocking distance should take into account the shape of the heliostats and the staggered gap between the staggered heliostats, so as to calculate the unobstructed distance ΔR. In order to make the ring spacing more flexible, a light-blocking coefficient s can be set so that the final calculated distance between the heliostat rings ΔR n =ΔR·s, where 0 <s<2,且ΔR n >R safe .

[0064] Heliostats are usually polygonal structures, commonly used shapes include quadrilaterals, pentagons or circles. The calculation method of the unobstructed distance varies depending on the number of sides and movement mode of the heliostat. Figure 3(a) 、 3(b) , Figure 3(a) 、 3(b) The viewing angle is the angle from the absorber to the heliostat.

[0065] Step S5: If the distance between heliostat rings ΔR 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] Usually the light blocking distance of the heliostat near the tower satisfies: ΔR n <ΔR0. Therefore, the mirror field near the tower, whether on the south or north side of the absorber tower, always maintains an arrangement in which the ring spacing is the theoretical ring spacing ΔR0.

[0067] When the mirror field is located in the northern hemisphere, as the heliostat gradually moves away from the heat absorbing tower, the unobstructed ring spacing and the theoretical ring spacing of the heliostat located on the north side of the heliostat gradually show ΔR n>ΔR0, and since the south heliostat is in a nearly horizontal position, the law of the unobstructed 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 fact 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 in an uneven manner, that is, the mirror field ring spacing on the south side is smaller and the mirror field ring spacing 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 is maintained between adjacent rings of heliostats. safe , no interference collision is allowed between any adjacent heliostats.

[0069] Specifically, step S5 also includes that when the mirror field is in the northern hemisphere, due to the setting of the light-free distance, the mirror field on the north side of the heat absorption tower may be slightly expanded 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. At this time, 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, set the arrangement angle of each ring of heliostats in the mirror field in a non-uniform manner: 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 the preset temperature, the heliostats on the south side of the heat absorption tower are denser, including: reducing the spacing between the heliostat rings on the south side by blocking the light distance, and / or arranging the mirror field in a way that densifies the mirror field on the south side by reducing the south side arrangement angle, such as Figure 6 As shown in the figure, 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 uneven north-south arrangement of heliostats in the same ring is arranged in a manner based on a gradual change in arrangement angles. The arrangement angles of any adjacent heliostats are different and decrease from large arithmetic differences or increase from small arithmetic differences.

[0071] Finally, a mirror field is formed, which is uniformly distributed in the north-south direction near the tower, the ring spacing of the mirror field far from the tower is adjustable, and the mirror field is unevenly arranged in the north-south direction. The north-south uneven arrangement has the following two modes: ① According to the calculation of the non-shading distance, the ring spacing on the south side is smaller than that on the north side, the arrangement angle of the heliostat on the same ring on the north side is larger than that on the south side, and the arrangement angle gradually decreases in equal difference from north to south; ② According to the calculation of the non-shading distance, the ring spacing on the south side is smaller than that on the north side, the arrangement angle of the heliostat on the same ring on the south side is larger than that on the north side, and the arrangement angle gradually increases in equal difference from north to south. As shown in Figure 7(a) and 7(b) The arrangement angle A1 is greater than A2.

[0072] Correspondingly, step S5 further includes, when the mirror field is in the southern hemisphere, during the arrangement of the mirror field, due to the setting of the non-shading distance, the mirror field on the south side of the heat absorption tower may be slightly expanded, resulting in cosine loss, which can be adjusted in two ways: (1) multiplying the non-shading distance ΔR between each ring on the south side of the mirror field by a non-shading coefficient s, where 0 < s < 1, so as to reduce the non-shading distance on the south side of the mirror field, and dividing the non-shading distance ΔR between each ring on the north side of the mirror field by a non-shading coefficient s, so as to increase the non-shading distance on the north side of the mirror field. (2) During the arrangement of the mirror field, the arrangement angle of each heliostat in the mirror field is unevenly arranged: the left and right spacing of the heliostat on the south side is smaller than that on the north side, and the adjacent arrangement angles change in equal difference from south to north.

[0073] Further, when the mirror field is in the southern hemisphere, if the number of heliostats on the north side is reduced due to the boundary limitation of the mirror field, and the wall temperature on the north side of the heat absorption tower is lower than the preset temperature, the heliostats on the north side of the heat absorption tower are densified, including: reducing the ring spacing of the heliostats on the north side through the shading distance, and / or arranging the mirror field by densifying the mirror field on the south side through the reduction of the arrangement angle on the north side.

[0074] Embodiment

[0075] When arranging the mirror field of a certain northern hemisphere project, the non-shading ring spacing ΔR near the tower is less than ΔR0, and due to the operation and maintenance of the mirror field, the safe ring spacing of the mirror field is set to 7 meters, and the relationship between the non-shading ring spacing near the tower and the theoretical ring spacing and the minimum safe ring spacing always satisfies: ΔR < ΔR0 < 7 or ΔR < 7 < ΔR0, therefore, the mirror field in the near-tower area can be uniformly arranged: the ring spacing in the north-south direction and the left-right spacing are the same.

[0076] As the mirror field gradually moves away from the heat absorption tower, the unobstructed ring spacing on the north side of the heat absorption tower becomes larger than the theoretical ring spacing (ΔR0 < ΔR), while the unobstructed 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 maintained at the unobstructed distance (or the unobstructed distance is multiplied by a coefficient to slightly reduce the unobstructed 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). In this case, 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 in the far tower area of ​​the heat absorption tower uneven.

[0078] During the design process 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 entire mirror field is also arranged unevenly from north to south through the dense arrangement angle of the south mirror field. 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 arranged in a way that gradually decreases from north to south, ultimately ensuring 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 replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection 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 based on the longitude and latitude of the project site; S2: Set the radius of the first ring heliostat , left and right spacing DM; S3: By staggering the arrangement, the distance between the second ring heliostats and the two adjacent heliostats in the first ring forms an equilateral triangle. Calculate the ring spacing between the second ring heliostats and the first ring heliostats. , 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 , when the calculated ring spacing When the ring spacing = , and finally the theoretical ring spacing of each ring is obtained ; Specifically include: when When , at this time the theoretical ring spacing of each ring is Is a fixed value ; when When , at this time the theoretical ring spacing of each ring is Is the change value ; S4: Calculate the unobstructed distance between adjacent heliostats in each ring based on the solar altitude angle α at the design point and the current motion posture of the heliostats. At the same time, set a no-light-blocking coefficient , used to adjust the distance between heliostat rings ,and ; S5: If the distance between heliostat rings , then the ring spacing of the corresponding ring is ,if , then the ring spacing of the corresponding ring is ; Step S5 also includes, when the mirror field is in the northern hemisphere, When arranging the mirror field, there should be no light blocking distance between the rings on the north side of the mirror field. Multiply by a light-free coefficient s to reduce or increase the light-free distance of the north mirror field. At the same time, the light-free distance between the rings on the south side of the mirror field is Divide by a light-free coefficient s to increase or decrease the light-free distance of the south mirror field; Step S5 also includes, when the mirror field is in the southern hemisphere, When arranging the mirror field, there should be no light blocking distance between the rings on the south side of the mirror field. Multiply by a light-free coefficient s to reduce or increase the light-free distance of the south mirror field. At the same time, the light-free distance between the rings on the north side of the mirror field is Divide by a light-free coefficient s to increase or decrease the light-free distance of the north mirror field.

2. The non-uniform mirror field arrangement method according to claim 1, wherein: In step S4, there is no light blocking distance The calculation results are determined based on the heliostat structure shape and movement mode.

3. The non-uniform mirror field arrangement method according to claim 1, wherein: 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, At this time, the different heliostat rings in the mirror field present a non-concentric north-south non-uniform arrangement feature.

4. The method for arranging a non-uniform mirror field according to claim 3, wherein: Step S5 further includes, when the mirror field is in the northern hemisphere, performing non-uniform arrangement of the arrangement angles of the heliostats in each ring of the mirror field during the arrangement of the mirror field: 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 vary equidistantly from north to south.

5. The non-uniform mirror field arrangement method according to claim 3, wherein: When the mirror field is in the northern hemisphere, if the boundary of the mirror field limits 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 denser, including: reducing the spacing between the heliostat rings on the south side by blocking the light distance, and / or arranging the mirror field in a manner that densifies the mirror field on the south side by reducing the south side arrangement angle.

6. The non-uniform mirror field arrangement method according to claim 5, wherein: Step S5 further includes, when the mirror field is in the southern hemisphere, performing non-uniform arrangement of the arrangement angles of the heliostats in each ring of the mirror field during the arrangement of the mirror field: 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 vary equidistantly from south to north.

7. The non-uniform mirror field arrangement method according to claim 5, wherein: When the mirror field is in the southern hemisphere, if the boundary of the mirror field is limited, resulting in a reduction in the number of heliostats on the north side, and the wall temperature on the north side of the heat absorption tower is lower than a preset temperature, the heliostats on the north side of the heat absorption tower are denser, including: reducing the spacing between the heliostat rings on the north side by blocking the light distance, and / or arranging the mirror field in a manner that densifies the mirror field on the south side by reducing the layout angle on the north side.

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