CN106703908A - Rankine cycle system with phase change energy storage heat exchanger - Google Patents
Rankine cycle system with phase change energy storage heat exchanger Download PDFInfo
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Abstract
本发明提供一种带有相变储能换热器的朗肯循环系统；所述系统包括依次串接的过热换热器，热功转换设备，冷凝换热器和泵，所述热功转换设备与发电机相连；所述系统还包括相变储能换热器和预热换热器；所述相变储能换热器的一端与所述预热换热器的一端相连，其另一端与所述过热换热器相连；所述预热换热器的另一端连接所述泵。本发明提供的朗肯循环系统将相变储能换热器与现有的朗肯循环技术相结合，保证循环中工质蒸发阶段与传热介质的传热温差较小，并传热温差保持不变，减小了系统火用损。
The invention provides a Rankine cycle system with a phase-change energy storage heat exchanger; the system includes a series-connected overheating heat exchanger, thermal power conversion equipment, condensing heat exchanger and a pump, and the thermal power conversion The equipment is connected to the generator; the system also includes a phase change energy storage heat exchanger and a preheating heat exchanger; one end of the phase change energy storage heat exchanger is connected to one end of the preheating heat exchanger, and the other One end is connected with the overheating heat exchanger; the other end of the preheating heat exchanger is connected with the pump. The Rankine cycle system provided by the invention combines the phase change energy storage heat exchanger with the existing Rankine cycle technology to ensure that the heat transfer temperature difference between the working fluid evaporation stage and the heat transfer medium in the cycle is small, and the heat transfer temperature difference remains unchanged, reducing the exergy loss of the system.
Description
技术领域technical field
本发明涉及一种朗肯循环系统，具体涉及一种带有相变储能换热器的朗肯循环系统，属于能源与动力技术领域。The invention relates to a Rankine cycle system, in particular to a Rankine cycle system with a phase change energy storage heat exchanger, belonging to the technical field of energy and power.
背景技术Background technique
朗肯循环是一种将热能转化为功的热力学循环。郎肯循环从外界吸收热量，将其闭环的工质加热做功。朗肯循环有以下四个过程：The Rankine cycle is a thermodynamic cycle that converts heat energy into work. The Rankine cycle absorbs heat from the outside, and heats its closed-loop working fluid to do work. The Rankine cycle has the following four processes:
1、工质被泵压缩，液体会从低压上升至高压，成为高压液；1. The working medium is compressed by the pump, and the liquid will rise from low pressure to high pressure, becoming high pressure liquid;
2、高压液被加热，在恒定压力下，高压液吸收了外部热源成为饱和蒸汽或过热蒸汽；2. The high-pressure liquid is heated, and under constant pressure, the high-pressure liquid absorbs the external heat source and becomes saturated steam or superheated steam;
3、蒸汽膨胀后，会推动涡轮机发电，蒸汽的温度和压力因此减少，并成为湿蒸汽；3. After the steam expands, it will drive the turbine to generate electricity, so the temperature and pressure of the steam will decrease and become wet steam;
4、湿蒸汽然后进入冷凝器，被冷凝成为饱和液体或过冷液体。4. The wet steam then enters the condenser and is condensed into saturated liquid or subcooled liquid.
相变储能换热器是将相变材料PCM封装于换热器中，外部可对其充热或放热，并且在一定条件下，充放热过程可保持温度恒定。The phase change energy storage heat exchanger is to encapsulate the phase change material PCM in the heat exchanger, which can be charged or released from the outside, and under certain conditions, the temperature can be kept constant during the charging and discharging process.
郎肯循环产生世界上90％的电力，包括几乎所有的太阳能热能，生物质能，煤炭与核能的电站。在太阳能热利用领域，尤其是太阳能热发电领域中，由于太阳辐照的强烈的不连续性和不稳定性，系统的运行也具有强烈的波动性和间歇性。为保证太阳能热利用系统稳定运行，弥补能源的供应和需求之间存在的数量上、形态上、时间和空间上的差异，太阳能热利用系统中一般都带有储热系统。储热系统可将白天的太阳辐照转换为热量储存起来，在没有太阳辐照时再把热量释放出来利用。尤其对于太阳能热发电系统，储热系统的引入不仅可以解决太阳能的可用性与电力需求不匹配的矛盾，对太阳能“移峰填谷”以延长系统发电时间，优化使用可再生能源和提高太阳能在能量利用中的份额和能源效率，而且可以有效地稳定系统运行和提高系统发电效率。The Rankine cycle generates 90% of the world's electricity, including nearly all solar thermal, biomass, coal and nuclear power plants. In the field of solar thermal utilization, especially in the field of solar thermal power generation, due to the strong discontinuity and instability of solar radiation, the operation of the system also has strong fluctuations and intermittent. In order to ensure the stable operation of the solar thermal utilization system and make up for the differences in quantity, form, time and space between the supply and demand of energy, the solar thermal utilization system generally has a heat storage system. The heat storage system can convert the solar radiation during the day into heat and store it, and then release the heat for use when there is no solar radiation. Especially for solar thermal power generation systems, the introduction of thermal storage systems can not only solve the contradiction between the availability of solar energy and power demand, but also "shift peaks and valleys" of solar energy to prolong the power generation time of the system, optimize the use of renewable energy and improve the energy efficiency of solar energy. The share and energy efficiency in utilization can effectively stabilize system operation and improve system power generation efficiency.
目前太阳能热利用领域中可以选择的储热方式主要包括三种：显热储热、相变潜热储热和化学能储热。基于显热储热的储热系统主要有两种：双罐储热系统和单罐储热系统。双罐储热系统中有一个热罐和一个冷罐，储热时通过泵将冷罐内的液体介质抽出，在其吸收热量后将之存储在热罐内，放热时通过泵将热罐内的高温介质抽出，在其释放热量后将之泵回冷罐。单罐储热系统只有一个储热罐。放热时高温储热工质在罐的顶部被高温泵抽出，经过换热器放热冷却后，由罐底部进入罐内；充热时低温储热工质在罐的底部被低温泵抽出，经过换热器加热后，由罐的顶部进入罐内。At present, there are mainly three heat storage methods that can be selected in the field of solar thermal utilization: sensible heat storage, phase change latent heat storage, and chemical energy storage. There are two main types of heat storage systems based on sensible heat storage: double-tank heat storage systems and single-tank heat storage systems. There is a hot tank and a cold tank in the double-tank heat storage system. When storing heat, the liquid medium in the cold tank is pumped out, and it is stored in the hot tank after absorbing heat. When releasing heat, the liquid medium in the cold tank is pumped out. The high-temperature medium in the tank is pumped out and pumped back to the cold tank after it releases heat. A single-tank heat storage system has only one heat storage tank. When releasing heat, the high-temperature heat storage medium is pumped out by the high-temperature pump at the top of the tank, and after being cooled by the heat exchanger, it enters the tank from the bottom of the tank; when charging, the low-temperature heat storage medium is drawn out by the low-temperature pump at the bottom of the tank. After being heated by the heat exchanger, it enters the tank from the top of the tank.
现有双罐及单罐储热系统等均属常规的显热储热技术，在工质的相变过程中，工质温度保持不变，而传热流体的温度逐步降低，此过程中传热温差大，系统火用损大。The existing double-tank and single-tank heat storage systems are all conventional sensible heat storage technologies. During the phase change process of the working fluid, the temperature of the working fluid remains unchanged, while the temperature of the heat transfer fluid gradually decreases. The thermal temperature difference is large, and the exergy loss of the system is large.
发明内容Contents of the invention
为了解决现有技术中所存在的上述不足，本发明提供一种带有相变储能换热器的朗肯循环系统，该朗肯循环系统可分级加热工质，将相变储能换热器应用于工质的蒸发阶段，可保证工质蒸发过程中与传热介质温差保持恒定，减少系统火用损。In order to solve the above-mentioned deficiencies in the prior art, the present invention provides a Rankine cycle system with a phase change energy storage heat exchanger. The device is used in the evaporation stage of the working fluid, which can ensure that the temperature difference between the working fluid and the heat transfer medium remains constant during the evaporation process, and reduce the exergy loss of the system.
本发明提供的技术方案是：一种带有相变储能换热器的朗肯循环系统；所述系统包括依次串接的过热换热器，热功转换设备，冷凝换热器和泵，所述热功转换设备与发电机相连；其改进之处在于：所述系统还包括相变储能换热器和预热换热器；所述相变储能换热器的一端与所述预热换热器的一端相连，其另一端与所述过热换热器相连；所述预热换热器的另一端连接所述泵。The technical solution provided by the present invention is: a Rankine cycle system with a phase change energy storage heat exchanger; the system includes successively connected superheated heat exchangers, thermal power conversion equipment, condensing heat exchangers and pumps, The thermal power conversion equipment is connected to the generator; the improvement is that: the system also includes a phase change energy storage heat exchanger and a preheating heat exchanger; one end of the phase change energy storage heat exchanger is connected to the One end of the preheating heat exchanger is connected, and the other end is connected with the overheating heat exchanger; the other end of the preheating heat exchanger is connected with the pump.
优选的，所述系统还包括蒸发换热器，所述蒸发换热器的两端分别串接第一开关阀后与两端分别串接有第二开关阀的所述相变储能换热器并联。Preferably, the system further includes an evaporative heat exchanger, the two ends of the evaporative heat exchanger are respectively connected in series with the first on-off valve, and the two ends of the evaporative heat exchanger are respectively connected in series with the phase-change energy storage heat exchanger with the second on-off valve. devices in parallel.
进一步，所述蒸发换热器、过热换热器和预热换热器均包括一次进口、一次出口、二次进口和二次出口；所述蒸发换热器的二次进口和二次出口分别串接所述第一开关阀，其一次进口和一次出口分别连接所述过热换热器的一次出口和所述预热换热器的一次进口；Further, the evaporating heat exchanger, the superheating heat exchanger and the preheating heat exchanger all include a primary inlet, a primary outlet, a secondary inlet and a secondary outlet; the secondary inlet and the secondary outlet of the evaporating heat exchanger are respectively The first switch valve is connected in series, and its primary inlet and primary outlet are respectively connected to the primary outlet of the superheating heat exchanger and the primary inlet of the preheating heat exchanger;
所述过热换热器的二次进口通过所述第二开关阀与所述相变储能换热器的一端相连，其二次出口与热功转换设备的一端相连；所述预热换热器的二次进口与泵的一端相连，其二次出口通过所述第二开关阀与所述相变储能换热器的另一端相连。The secondary inlet of the superheating heat exchanger is connected to one end of the phase change energy storage heat exchanger through the second switch valve, and its secondary outlet is connected to one end of the heat conversion equipment; the preheating heat exchange The secondary inlet of the device is connected to one end of the pump, and the secondary outlet thereof is connected to the other end of the phase change energy storage heat exchanger through the second switching valve.
进一步，所述过热换热器的一次进口和所述预热换热器的一次出口与太阳能供热系统相连。Further, the primary inlet of the overheating heat exchanger and the primary outlet of the preheating heat exchanger are connected to a solar heating system.
进一步，所述太阳能供热系统包括热罐、太阳能集热器和冷罐；所述太阳能集热器的两端分别连接所述热罐的一端和所述冷罐的一端；所述热罐的另一端与所述过热换热器的一次进口相连；所述冷罐的另一端与所述预热换热器的一次出口相连。Further, the solar heating system includes a hot tank, a solar collector and a cold tank; two ends of the solar collector are respectively connected to one end of the hot tank and one end of the cold tank; The other end is connected with the primary inlet of the overheating heat exchanger; the other end of the cold tank is connected with the primary outlet of the preheating heat exchanger.
进一步，预热换热器和/或过热换热器和/或冷凝换热器至少设置有两个，换热器之间采用串联、并联或混合方式连接。Further, there are at least two preheating heat exchangers and/or overheating heat exchangers and/or condensing heat exchangers, and the heat exchangers are connected in series, parallel or mixed.
进一步，工质经过泵升压后进入预热换热器，经预热换热器加热到饱和液态；饱和液态的工质进入相变储能换热器或蒸发换热器，经相变储能换热器恒温加热到饱和气态后或经蒸发换热器加热到饱和气态后进入过热换热器；过热换热器将饱和气态工质加热到过热蒸汽，过热蒸汽进入热功转换设备，使热功转换设备做功带动发电机发电；热功转换设备做功后的过热蒸汽变为湿蒸汽，进入冷凝换热器冷凝成饱和液体或过冷液体，再次经过泵升压完成一次朗肯循环。Further, the working fluid enters the preheating heat exchanger after being boosted by the pump, and is heated to a saturated liquid state through the preheating heat exchanger; the saturated liquid working medium enters a phase change energy storage heat exchanger or an evaporation heat exchanger, After the energy heat exchanger is heated to a saturated gas state at a constant temperature or heated to a saturated gas state by an evaporative heat exchanger, it enters the superheat heat exchanger; The thermal power conversion equipment does work to drive the generator to generate electricity; the superheated steam after the thermal power conversion equipment does work becomes wet steam, enters the condensing heat exchanger to condense into saturated liquid or supercooled liquid, and is boosted by the pump again to complete a Rankine cycle.
进一步，所述工质为单一组分的工质或混合物工质；所述相变储能换热器的相变材料与工质蒸发温度相匹配。Further, the working fluid is a single-component working fluid or a mixture of working fluids; the phase-change material of the phase-change energy storage heat exchanger matches the evaporation temperature of the working fluid.
进一步，所述热罐内存储高温集热介质；所述冷罐内存储低温集热介质；所述太阳能集热器吸收太阳能，用于给集热介质升温；Further, the hot tank stores a high-temperature heat-collecting medium; the cold tank stores a low-temperature heat-collecting medium; the solar heat collector absorbs solar energy for heating the heat-collecting medium;
所述低温集热介质从所述冷罐中抽出进入所述太阳能集热器，在所述太阳能集热器内变为高温集热介质后进入热罐中储存起来，同时热罐中抽出部分高温集热介质进入过热换热器放热，加热进入到过热换热器内的饱和气态工质，使之变为过热蒸汽，驱动热功转换设备带动发电机发电；高温集热介质放热后变为低温集热介质再次进入冷罐。The low-temperature heat-collecting medium is extracted from the cold tank and enters the solar heat collector, becomes a high-temperature heat-collecting medium in the solar heat collector, and then enters the hot tank for storage. The heat collecting medium enters the superheating heat exchanger to release heat, heats the saturated gaseous working medium entering the superheating heat exchanger, turns it into superheated steam, drives the thermal power conversion equipment to drive the generator to generate electricity; the high temperature heat collecting medium turns into Enter the cold tank again for the low-temperature heat-collecting medium.
进一步，所述相变储能换热器的加热方式来源于太阳能加热、电加热或内设传热管道加热中的任意一种。Further, the heating method of the phase change energy storage heat exchanger comes from any one of solar heating, electric heating or heating with built-in heat transfer pipes.
与最接近的现有技术相比，本发明具有如下显著进步：Compared with the closest prior art, the present invention has following remarkable progress:
本发明提供的技术方案将相变储能换热器与传统的朗肯循环系统相结合，将循环工质进行分级加热，将相变储能换热器应用于朗肯循环回路工质的蒸发阶段，利用相变储能换热器中相变材料相变时温度保持恒定的特性，使得传热介质和工质的传热温差较小，且传热温差保持不变，有效减小了系统火用损。The technical solution provided by the invention combines the phase change energy storage heat exchanger with the traditional Rankine cycle system, heats the circulating working fluid in stages, and applies the phase change energy storage heat exchanger to the evaporation of the working medium in the Rankine cycle loop stage, using the characteristic that the temperature of the phase change material in the phase change energy storage heat exchanger remains constant during the phase change, so that the heat transfer temperature difference between the heat transfer medium and the working fluid is small, and the heat transfer temperature difference remains unchanged, effectively reducing the system Fire damage.
附图说明Description of drawings
图1为传统朗肯循环系统图。Figure 1 is a diagram of a traditional Rankine cycle system.
图2为本发明提供的带有相变储能换热器的朗肯循环系统图。Fig. 2 is a diagram of a Rankine cycle system provided by the present invention with a phase change energy storage heat exchanger.
图3为本发明实施例的结构示意图。Fig. 3 is a schematic structural diagram of an embodiment of the present invention.
图中标号：1-泵、2-工质回路、3-冷凝换热器、4-热功转换设备、5-发电机、6-换热器、6a-预热换热器、6b-相变储能换热器、6c-过热换热器、6d-蒸发换热器、7-传热流体回路、8-热罐、9-太阳能集热器、10-冷罐。Labels in the figure: 1-pump, 2-working medium circuit, 3-condensing heat exchanger, 4-thermal power conversion equipment, 5-generator, 6-heat exchanger, 6a-preheating heat exchanger, 6b-phase Variable energy storage heat exchanger, 6c-overheating heat exchanger, 6d-evaporation heat exchanger, 7-heat transfer fluid circuit, 8-hot tank, 9-solar collector, 10-cold tank.
具体实施方式detailed description
下面结合附图对本发明的具体实施方式作进一步的详细说明。The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.
为了彻底了解本发明实施例，将在下列的描述中提出详细的结构。显然，本发明实施例的施行并不限定于本领域的技术人员所熟习的特殊细节。本发明的较佳实施例详细描述如下，然而除了这些详细描述外，本发明还可以具有其他实施方式。In order to thoroughly understand the embodiments of the present invention, the detailed structure will be set forth in the following description. Obviously, the practice of the embodiments of the invention is not limited to specific details familiar to those skilled in the art. Preferred embodiments of the present invention are described in detail below, however, the present invention may have other embodiments besides these detailed descriptions.
图1为传统朗肯循环系统图，本实施例提供的朗肯循环系统在传统朗肯循环系统中增加了相变储能换热器6b和预热换热器6a，其结构如图2所示。所述朗肯循环系统包括依次串接的过热换热器6c，热功转换设备4，冷凝换热器3和泵1，所述热功转换设备4与发电机5相连；相变储能换热器6b和预热换热器6a串联连接后一端与所述过热换热器6c相连，另一端与所述泵1连接。Figure 1 is a diagram of a traditional Rankine cycle system. The Rankine cycle system provided by this embodiment adds a phase change energy storage heat exchanger 6b and a preheating heat exchanger 6a in the traditional Rankine cycle system, and its structure is shown in Figure 2 Show. The Rankine cycle system includes an overheating heat exchanger 6c connected in series, a thermal power conversion device 4, a condensation heat exchanger 3 and a pump 1, and the thermal power conversion device 4 is connected to a generator 5; the phase change energy storage converter After the heat exchanger 6b and the preheating heat exchanger 6a are connected in series, one end is connected to the overheating heat exchanger 6c, and the other end is connected to the pump 1 .
其中预热换热器6a、过热换热器6c和冷凝换热器3均设置有一个或多个；换热器之间采用串联、并联或混合方式连接。One or more preheating heat exchangers 6a, overheating heat exchangers 6c and condensing heat exchangers 3 are provided; the heat exchangers are connected in series, parallel or mixed.
工质经过泵1升压后进入预热换热器6a，经预热换热器6a加热到饱和液态，饱和液态的工质进入相变储能换热器6b，经相变储能换热器6b恒温加热到饱和气态后进入过热换热器6c，过热换热器6c将饱和气态工质加热到过热蒸汽，过热蒸汽进入热功转换设备4，使热功转换设备4做功带动发电机5发电；热功转换设备4做功后的过热蒸汽变为湿蒸汽，进入冷凝换热器3冷凝成饱和液体或过冷液体，再次经过泵1升压完成一次朗肯循环。The working medium enters the preheating heat exchanger 6a after being boosted by the pump 1, and is heated to a saturated liquid state through the preheating heat exchanger 6a, and the saturated liquid working medium enters the phase change energy storage heat exchanger 6b, and is heat exchanged through the phase change energy storage The superheater 6b is heated to a saturated gas state at a constant temperature and then enters the superheater 6c. The superheater 6c heats the saturated gaseous working medium to superheated steam, and the superheated steam enters the thermal power conversion device 4 to make the thermal power conversion device 4 do work to drive the generator 5 Power generation; the superheated steam after the thermal power conversion device 4 has done work becomes wet steam, enters the condensing heat exchanger 3 to condense into saturated liquid or supercooled liquid, and is boosted by the pump 1 again to complete a Rankine cycle.
上述步骤中工质采用单一组分的工质(例如水)或混合物工质作为循环介质。预热后的饱和液态工作进入相变储能换热器6b，相变储能换热器6b中的相变材料与工质蒸发温度相匹配，利用相变储能换热器6b中相变材料相变时温度保持恒定的特性，使得传热介质和工质的传热温差较小，且传热温差保持不变，可减小系统火用损。The working fluid in the above steps adopts a single-component working fluid (such as water) or a mixture of working fluids as the circulating medium. The preheated saturated liquid work enters the phase change energy storage heat exchanger 6b, the phase change material in the phase change energy storage heat exchanger 6b matches the evaporation temperature of the working fluid, and utilizes the phase change in the phase change energy storage heat exchanger 6b The characteristic that the temperature remains constant when the material phase changes makes the heat transfer temperature difference between the heat transfer medium and the working fluid smaller, and the heat transfer temperature difference remains unchanged, which can reduce the exergy loss of the system.
所述相变储能换热器6b的加热方式采用太阳能加热、电加热或内设传热管道加热等方式。The heating method of the phase-change energy storage heat exchanger 6b adopts solar heating, electric heating or heating with built-in heat transfer pipes.
本发明提供的另一实施例如图3所示：在附图2的基础上增加蒸发换热器6d；蒸发换热器6d的两端分别串接第一开关阀后与两端分别串接有第二开关阀的所述相变储能换热器6b并联。Another embodiment provided by the present invention is shown in Figure 3: an evaporating heat exchanger 6d is added on the basis of the accompanying drawing 2; The phase change energy storage heat exchanger 6b of the second on-off valve is connected in parallel.
所述蒸发换热器6d、过热换热器6c和预热换热器6a均包括一次进口、一次出口、二次进口和二次出口；所述蒸发换热器6d的二次进口和二次出口分别串接所述第一开关阀，其一次进口和一次出口分别连接所述过热换热器6c的一次出口和所述预热换热器6a的一次进口；The evaporating heat exchanger 6d, the overheating heat exchanger 6c and the preheating heat exchanger 6a all include a primary inlet, a primary outlet, a secondary inlet and a secondary outlet; the secondary inlet and the secondary The outlets are respectively connected in series with the first on-off valve, and the primary inlet and primary outlet are respectively connected to the primary outlet of the superheating heat exchanger 6c and the primary inlet of the preheating heat exchanger 6a;
所述过热换热器6c的二次进口通过所述第二开关阀与所述相变储能换热器6b的一端相连，其二次出口与热功转换设备4的一端相连；所述预热换热器6a的二次进口与泵1的一端相连，其二次出口通过所述第二开关阀与所述相变储能换热器6b的另一端相连；The secondary inlet of the overheating heat exchanger 6c is connected to one end of the phase change energy storage heat exchanger 6b through the second switch valve, and its secondary outlet is connected to one end of the thermal power conversion device 4; The secondary inlet of the heat exchanger 6a is connected to one end of the pump 1, and its secondary outlet is connected to the other end of the phase change energy storage heat exchanger 6b through the second switching valve;
所述过热换热器6c的一次进口和所述预热换热器6a的一次出口与太阳能供热系统相连，利用太阳能供热系统给相变储能换热器6b供热。The primary inlet of the superheating heat exchanger 6c and the primary outlet of the preheating heat exchanger 6a are connected to a solar heating system, and the solar heating system is used to supply heat to the phase change energy storage heat exchanger 6b.
所述太阳能供热系统包括依次串接的热罐8、太阳能集热器9和冷罐10；所述热罐8的另一端与所述过热换热器6c的一次进口相连；所述冷罐10的另一端与所述预热换热器6a的一次出口相连。The solar heating system includes a hot tank 8, a solar collector 9 and a cold tank 10 connected in series; the other end of the hot tank 8 is connected to the primary inlet of the overheating heat exchanger 6c; the cold tank The other end of 10 is connected with the primary outlet of the preheating heat exchanger 6a.
所述热罐8内存储高温集热介质；所述冷罐10内存储低温集热介质；所述太阳能集热器9吸收太阳能，用于给集热介质升温；The hot tank 8 stores a high-temperature heat-collecting medium; the cold tank 10 stores a low-temperature heat-collecting medium; the solar heat collector 9 absorbs solar energy and is used to heat up the heat-collecting medium;
白天太阳充足时，低温集热介质从所述冷罐10中抽出进入所述太阳能集热器9，在所述太阳能集热器9内变为高温集热介质后进入热罐8中储存起来，同时热罐8中抽出部分高温集热介质进入过热换热器6c放热，加热进入到过热换热器6c内的饱和气态工质，使之变为过热蒸汽，驱动热功转换设备4带动发电机5发电；高温集热介质放热后变为低温集热介质经过传热流体回路7再次进入冷罐10；When the sun is sufficient during the day, the low-temperature heat-collecting medium is extracted from the cold tank 10 and enters the solar heat collector 9, and after becoming a high-temperature heat-collecting medium in the solar heat collector 9, it enters the hot tank 8 for storage. At the same time, part of the high-temperature heat-collecting medium is extracted from the heat tank 8 and enters the superheat exchanger 6c to release heat, heats the saturated gaseous working medium entering the superheat exchanger 6c, and turns it into superheated steam, which drives the thermal power conversion device 4 to drive power generation The machine 5 generates electricity; the high-temperature heat-collecting medium turns into a low-temperature heat-collecting medium after releasing heat, and enters the cold tank 10 again through the heat-transfer fluid circuit 7;
晚上太阳能不足时，白天储存的多余的高温集热介质可保证一段时间的供热量。When the solar energy is insufficient at night, the excess high-temperature heat-collecting medium stored during the day can guarantee heat supply for a period of time.
本发明提供的第二种实施例有两种运行方式：The second embodiment provided by the present invention has two modes of operation:
(1)相变储能换热器6b充热后，可开启其所在工质回路2，关闭蒸发换热器6d工质回路2，工质经过预热换热器6a预热成饱和液态后进入相变储能换热器6b，吸收相变材料能量变成饱和气态，再进入过热换热器6c加热成过热蒸汽，通过热功转换热备4做功并带动发电机5发电，最后通过冷凝换热器3冷凝，此种运行方式系统火用损小。(1) After the phase change energy storage heat exchanger 6b is charged, the working medium circuit 2 where it is located can be opened, and the working medium circuit 2 of the evaporation heat exchanger 6d can be closed. After the working medium is preheated into a saturated liquid state by the preheating heat exchanger 6a It enters the phase change energy storage heat exchanger 6b, absorbs the energy of the phase change material and becomes a saturated gas state, then enters the superheat heat exchanger 6c to be heated into superheated steam, converts the thermal power to the hot standby 4 to do work and drives the generator 5 to generate electricity, and finally through condensation The heat exchanger 3 condenses, and the exergy loss of the system is small in this mode of operation.
(2)相变储能换热器6b放热后，关闭其所在工质回路2，开启蒸发换热器6d所在工质回路2。此时，系统工质加热阶段由常规换热器进行换热。(2) After the phase change energy storage heat exchanger 6b releases heat, close the working medium circuit 2 where it is located, and open the working medium circuit 2 where the evaporation heat exchanger 6d is located. At this time, the heating stage of the working fluid in the system is exchanged by conventional heat exchangers.
最后应当说明的是：以上实施例仅用以说明本发明的技术方案而非对其限制，尽管参照上述实施例对本发明进行了详细的说明，所属领域的普通技术人员依然可以对本发明的具体实施方式进行修改或者等同替换，这些未脱离本发明精神和范围的任何修改或者等同替换，均在申请待批的权利要求保护范围之内。Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art can still implement the present invention Any modification or equivalent replacement that does not deviate from the spirit and scope of the present invention is within the protection scope of the pending claims.
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