Novel fused salt heat absorber
阅读说明：本技术 一种新型熔盐吸热器 (Novel fused salt heat absorber ) 是由 童良怀 肖刚 刘震杰 徐小捷 周文 王涛 夏尚 蒋文涣 黄旭 王海亮 于 2020-09-02 设计创作，主要内容包括：本发明公开了一种新型熔盐吸热器,包括：分配集箱、连通管、吸热管、进口集箱、出口集箱、中间集箱；分配集箱通过连通管与进口集箱连接；进口集箱和出口集箱为一体式结构,中间采用隔板分离；进口集箱与出口集箱通过吸热管连接；吸热管包括上排吸热管和下排吸热管；上排吸热管与下排吸热管通过中间集箱连接。本发明结构紧凑,贴近实物,尽可能地提高吸热器对实验室内配套的太阳能模拟聚光器的热辐射吸收率,同时也考虑了制造加工的可行性,针对熔盐易凝固的特点,采取了防范措施,防止了熔盐冷态时在吸热器内积存,在进、出口和中间集箱上预留了足够的测温仪表接口,为后续试验收集熔盐温度提供了条件。(The invention discloses a novel molten salt heat absorber, which comprises: the heat absorption device comprises a distribution header, a communicating pipe, a heat absorption pipe, an inlet header, an outlet header and an intermediate header; the distribution header is connected with the inlet header through a communicating pipe; the inlet header and the outlet header are of an integrated structure, and the middle part is separated by a partition plate; the inlet header and the outlet header are connected through a heat absorption pipe; the heat absorption pipes comprise an upper row of heat absorption pipes and a lower row of heat absorption pipes; the upper row of heat absorption pipes are connected with the lower row of heat absorption pipes through a middle header. The solar energy collection device is compact in structure, close to a real object, capable of improving the heat radiation absorption rate of the heat absorber to the solar energy simulation condenser matched in the laboratory as much as possible, considering the feasibility of manufacturing and processing, taking precautionary measures aiming at the characteristic that the molten salt is easy to solidify, preventing the molten salt from being accumulated in the heat absorber in a cold state, reserving enough temperature measuring instrument interfaces on the inlet, the outlet and the middle header, and providing conditions for collecting the temperature of the molten salt in subsequent tests.)
1. A novel molten salt heat absorber is characterized by comprising: the heat absorption device comprises a distribution header, a communicating pipe, a heat absorption pipe, an inlet header, an outlet header and an intermediate header;
the distribution header is connected with the inlet header through the communicating pipe; the inlet header and the outlet header are of an integrated structure, and the middle of the inlet header and the outlet header are separated by a partition plate; the inlet header and the outlet header are connected through the heat absorption pipe; the heat absorption pipes comprise an upper row of heat absorption pipes and a lower row of heat absorption pipes; the upper row of heat absorbing pipes is connected with the lower row of heat absorbing pipes through the middle header.
2. A novel molten salt heat absorber as claimed in claim 1 wherein the distribution header, inlet header, outlet header, intermediate header are each provided with interfaces comprising N1, N2, N3a, N3b, N3c, N4a, N4b, N4 c; the interface is flange connection.
3. A novel molten salt heat absorber as claimed in claim 1, wherein the upper row of heat absorbing pipes and the lower row of heat absorbing pipes are respectively composed of the same number of heat absorbing pipes in parallel; the upper row of heat absorption pipes are straight pipes, the two ends of the lower row of heat absorption pipes are connected through elbows, the lengths of the straight pipe sections of the upper row of heat absorption pipes and the lower row of heat absorption pipes cover the effective irradiation range of a matched solar simulation condenser in a laboratory, and the upper row of heat absorption pipes and the lower row of heat absorption pipes are connected in series through a middle header.
4. A novel molten salt heat absorber as claimed in claim 2, wherein the upper and lower rows of heat absorbing pipes are connected with the inlet header, the outlet header and the intermediate header in a staggered arrangement; the straight pipe sections of the upper row of heat absorbing pipes and the lower row of heat absorbing pipes are on the same horizontal plane; the clearance between the heat absorption pipes is 1 mm.
5. A novel molten salt heat absorber as claimed in claim 2 wherein the absorber tubes are inclined at 1%; and blow-off pipes are arranged at the bottoms of the distribution header, the middle header and the outlet header.
6. A novel molten salt heat absorber as claimed in claim 1, wherein thermometers are respectively mounted on the inlet header, the outlet header and the intermediate header.
Technical Field
The invention relates to the technical field of solar photo-thermal power generation, in particular to a novel molten salt heat absorber.
Background
The solar photovoltaic system is high in photo-thermal efficiency, friendly to a power grid, important in the development of solar power generation, and mainly comprises four forms, namely a tower type form, a disc type form, a groove type form and a linear Fresnel type form. The tower type solar photo-thermal power generation has large scale, the power generation cost is expected to be further reduced, and the development potential is great. The heat absorber absorbs the collected sunlight heat and converts the sunlight heat into heat energy of working fluid (molten salt, water, air or the like), and the heat absorber is one of core components of a power station system. Among various heat transfer working media, a heat absorber using molten salt as a working medium has higher heat collection temperature and low operation pressure, and is most widely applied to the current tower type solar thermal power station.
The existing tower type solar photothermal power station is mainly distributed in northwest of China, is influenced by external natural conditions, has great working temperature change of a heat absorber, and lacks analysis on temperature drop characteristics of the heat absorber in different environments and how to adopt an optimal protective structure research.
Disclosure of Invention
In order to solve the problems in the prior art, the embodiment of the invention provides a novel molten salt heat absorber. The technical scheme is as follows:
in one aspect, a novel molten salt heat absorber is provided, comprising: the heat absorption device comprises a distribution header, a communicating pipe, a heat absorption pipe, an inlet header, an outlet header and an intermediate header;
the distribution header is connected with the inlet header through the communicating pipe; the inlet header and the outlet header are of an integrated structure, and the middle of the inlet header and the outlet header are separated by a partition plate; the inlet header and the outlet header are connected through the heat absorption pipe; the heat absorption pipes comprise an upper row of heat absorption pipes and a lower row of heat absorption pipes; the upper row of heat absorbing pipes is connected with the lower row of heat absorbing pipes through the middle header.
Further, the distribution header, the inlet header, the outlet header and the intermediate header are provided with interfaces, and the interfaces include N1, N2, N3a, N3b, N3c, N4a, N4b and N4 c; the interface is flange connection.
Further, the heat absorption pipe on the novel fused salt heat absorber, arrange the heat absorption pipe down and respectively constitute by the heat absorption pipe that the quantity is the same is parallelly connected, go up to arrange the heat absorption pipe and adopt the straight tube, arrange the heat absorption pipe both ends down and adopt the elbow to connect, go up to arrange the heat absorption pipe and arrange the effective irradiation range of supporting solar energy simulation spotlight ware in the laboratory with the straight tube section length of heat absorption pipe down, go up to arrange the heat absorption pipe and arrange the heat absorption pipe down and adopt series connection through middle collection case.
Furthermore, the upper row of heat absorption pipes and the lower row of heat absorption pipes are connected with the inlet header, the outlet header and the middle header in a staggered arrangement; the straight pipe sections of the upper row of heat absorbing pipes and the lower row of heat absorbing pipes are on the same horizontal plane; the clearance between the heat absorption pipes is 1 mm.
Further, the inclination of the heat absorption pipe is 1%; and blow-off pipes are arranged at the bottoms of the distribution header, the middle header and the outlet header.
Furthermore, the inlet header, the outlet header and the middle header are respectively provided with a temperature measuring instrument.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the novel molten salt heat absorber provided by the invention simulates the structure of a tower-type solar heat absorber, the adopted heat absorption pipe is consistent in specification and material with the heat absorber in service at present, the structure is compact, the heat absorption rate of the heat absorber to the solar simulation condenser matched in a laboratory is improved as much as possible, meanwhile, the feasibility of manufacturing and processing is also considered, and a precautionary measure is taken aiming at the characteristic that molten salt is easy to solidify, so that the molten salt is prevented from being accumulated in the heat absorber in a cold state, enough temperature measuring instrument interfaces are reserved on an inlet, an outlet and a middle header, and conditions are provided for collecting the molten salt temperature in a subsequent test. By adjusting the number of switches of the solar simulation condenser, the research on the gradual disappearance of radiation can be carried out, the factors such as the ambient wind speed, the protective material, the molten salt mass flow and the inlet temperature outside the molten salt heat absorber can be changed, the temperature drop characteristic of the molten salt heat absorber after the disappearance of the condensed radiation under different conditions can be respectively researched, and the temperature drop speed of the heat absorber can be reduced by increasing the external protective structure of the heat absorber. And (4) comparing and analyzing the temperature drop characteristics of the heat absorbers under different protective structures, and searching for the optimal protective structure.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a front view of a novel molten salt heat absorber according to an embodiment of the invention;
FIG. 2 is a top view of a novel molten salt heat sink of an embodiment of the present invention;
FIG. 3 is a cross-sectional view A-A of FIG. 2;
FIG. 4 is a cross-sectional view B-B of FIG. 2;
fig. 5 is a cross-sectional view C-C of fig. 2.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The invention provides a novel molten salt heat absorber, see fig. 1-5, comprising: the distribution header 3, the communicating pipe 5, the heat absorbing pipe, the inlet header 9, the outlet header 11 and the
the distribution header 3 is connected with the inlet header 9 through the communicating pipe 5; the inlet header 9 and the outlet header 11 are of an integrated structure, and are separated by a
Specifically, one end of the distribution header 3 is provided with a molten salt inlet interface N1, N1 is composed of a first connecting pipe 1 and a
In the embodiment, the molten salt enters the heat absorber and then flows into the distribution header and then flows into the inlet header through the three communicating pipes, so that the inconsistent mass flow rate of the molten salt in the heat absorbing pipe can be avoided; in order to ensure the simple and symmetrical structure, the inlet collection box and the outlet collection box are integrated, and the middle is separated by a partition plate; meanwhile, as the viscosity of the molten salt is high, in order to reduce the flow resistance, the upper row of heat absorption pipes and the lower row of heat absorption pipes are not connected by an elbow, but are connected by an intermediate header, so that the resistance is greatly reduced, and the intermediate header can be used for mixing the molten salt with temperature difference in the upper row of heat absorption pipes due to heat absorption condition difference, so that the temperature difference of the molten salt in the lower row of heat absorption pipes is prevented from being further increased.
Further, the distribution header, the inlet header, the outlet header and the intermediate header are provided with interfaces, and the interfaces include N1, N2, N3a, N3b, N3c, N4a, N4b and N4 c; the interface is flange connection.
Specifically, in this embodiment, this novel molten salt heat absorber is the test device, and for the convenience of removal and dismantlement, molten salt import interface N1, molten salt export interface N2, temperature measurement mouth N3a, N3b, N3c and drain N4a, N4b, N4c all set up to flange joint.
Further, the heat absorption pipe on the novel fused salt heat absorber, arrange the heat absorption pipe down and respectively constitute by the heat absorption pipe that the quantity is the same is parallelly connected, arrange the heat absorption pipe in and adopt the straight tube, arrange the heat absorption pipe both ends down and adopt the elbow to connect, the straight tube section length of arranging the heat absorber from top to bottom covers the effective irradiation range of supporting solar energy simulation spotlight ware in the laboratory, arrange the heat absorption pipe in and arrange the heat absorption pipe down and adopt series connection through middle header.
Specifically, in this embodiment, the novel molten salt heat absorber simulates the field condition of a solar tower-type heat absorber, in order to fully utilize the heat energy of the heat radiation of a solar simulation condenser matched in a laboratory and improve the temperature of molten salt in the heat absorption pipe, the heat absorption pipes are arranged on the same horizontal plane and divided into an upper row of heat absorption pipes and a lower row of heat absorption pipes, the straight pipe sections of the upper row of heat absorption pipes and the lower row of heat absorption pipes are larger than the side length of the effective irradiation range of the solar simulation condenser, the same row of heat absorption pipes are arranged in parallel, the upper row of heat absorption pipes and the lower row of heat absorption pipes are arranged in series, and the flow stroke; in order to arrange the lower row of heat absorption pipes and the upper row of heat absorption pipes on the same plane, the lower row of heat absorption pipes are connected with the middle header and the outlet header by adopting elbows.
Furthermore, the upper row of heat absorption pipes and the lower row of heat absorption pipes are connected with the inlet header, the outlet header and the middle header in a staggered arrangement; the straight pipe sections of the upper row of heat absorbing pipes and the lower row of heat absorbing pipes are on the same horizontal plane, the gaps among the heat absorbing pipes are 1mm, and in other embodiments, the gaps among the heat absorbing pipes can be reduced to the minimum according to requirements.
Specifically, in this embodiment, the effective irradiation range of supporting solar energy simulation spotlight ware in the laboratory is the square of length of a side 300mm, and for improving the effective heat absorption area of tube panel, the clearance is best adjusted to the minimum between the heat absorption pipe, but if the pipe interval undersize, unable welding process, this novel fused salt heat absorber go up the heat absorption pipe and arrange the heat absorption pipe down and adopt the staggered arrangement with import collection box, export collection box, middle collection box connection, avoided the welding difficult problem, the clearance adjustment of heat absorption pipe is minimum simultaneously, accomplishes effective irradiation range make full use of like this.
Further, the inclination of the heat absorption pipe is 1%; and blow-off pipes are arranged at the bottoms of the distribution header, the middle header and the outlet header.
Specifically, in this embodiment, in order to prevent that the molten salt from accumulating in the heat absorber when cold, so probably leading to whole heat absorber to be blockked up, this molten salt heat absorption pipe has adopted 1% gradient, all has the blow off pipe at distribution header, middle header and export header bottom, ensures like this that the molten salt in the whole heat absorber can be drained off rapidly when needing. Besides the heat absorption pipe, other parts of the heat absorber are wound with electric tracing bands and wrapped with heat insulation cotton to prevent molten salt from solidifying.
Furthermore, the inlet header, the outlet header and the middle header are respectively provided with a temperature measuring instrument.
Specifically, in the embodiment, the temperature measuring instruments are respectively arranged on the inlet header, the outlet header and the middle header, so that the temperature of the molten salt in the heat absorber can be visually observed, and the heat efficiency of the heat absorber can be evaluated by combining other devices and instruments, which is the first domestic measurement and evaluation of the heat efficiency of the heat absorber; the temperature measuring device is arranged on the outer surface of the heat absorption pipe, so that the temperature change of the outer surface of the heat absorption pipe can be observed under different solar simulation condenser irradiation intensities, and the overtemperature of the pipe wall can be prevented.
In this embodiment, adopt this novel fused salt heat absorber to recombine other auxiliary facilities in the experiment, through factors such as changing ambient wind speed outside the fused salt heat absorber, protective material, fused salt mass flow, different ambient wind speeds, different protective material kinds, different protective material thickness, different air interlamellar spacing, different mass flow and different fused salt import temperature disappear back heat absorber outer wall temperature drop characteristic and slow down the heat absorber temperature drop speed through increasing the outer protective structure of heat absorber respectively to spotlight radiation. And (4) comparing and analyzing the temperature drop characteristics of the heat absorbers under different protective structures, and searching for the optimal protective structure.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the novel molten salt heat absorber provided by the invention simulates the structure of a tower-type solar heat absorber, the adopted heat absorption pipe is consistent in specification and material with the heat absorber in service at present, the structure is compact, the absorption rate of the heat absorber to the solar simulation condenser matched in a laboratory for radiating heat energy is improved as much as possible, meanwhile, the feasibility of manufacturing and processing is also considered, and a precautionary measure is taken aiming at the characteristic that molten salt is easy to solidify, so that the molten salt is prevented from being accumulated in the heat absorber in a cold state, enough temperature measuring instrument interfaces are reserved on an inlet, an outlet and a middle header, and conditions are provided for collecting the molten salt temperature in a subsequent test. By adjusting the number of switches of the solar simulation condenser, the gradual disappearance of radiation (the power of the solar simulation condenser is reduced until the solar simulation condenser is closed) is researched, factors such as the ambient wind speed outside the fused salt heat absorber, protective materials, the fused salt mass flow and the inlet temperature are changed, the temperature drop characteristic of the fused salt heat absorber after the disappearance of the concentrated radiation under different conditions can be respectively researched, and the temperature drop speed of the heat absorber is reduced by adding an external protective structure of the heat absorber. And (4) comparing and analyzing the temperature drop characteristics of the heat absorbers under different protective structures, and searching for the optimal protective structure.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
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