CN111456818A - Double-source heating fused salt energy storage system of thermal power plant - Google Patents
Double-source heating fused salt energy storage system of thermal power plant Download PDFInfo
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Abstract
本发明涉及一种火力发电厂双源加热熔盐储能系统，该熔盐储能系统，包括火力发电系统、双源加热熔盐系统和熔盐储热系统，火力发电系统、双源加热熔盐系统和熔盐储热系统依次连接，实现火力发电系统高品位蒸汽和电力与熔盐储热系统之间的热交换功能。通过蒸汽和电的混合加热熔盐，可实现火力发电厂全负荷调峰。火力发电厂双源加热熔盐储能系统也可保证高品位蒸汽热能大部分储存起来，汽轮发电机组低负荷运行，发出电力进一步加热熔盐进行储热，使火力发电厂机组具备全负荷深度调峰能力和调峰后迅速增负荷能力。
The invention relates to a dual-source heating molten salt energy storage system for a thermal power plant. The molten salt energy storage system includes a thermal power generation system, a dual-source heating molten salt system and a molten salt heat storage system. The salt system and the molten salt heat storage system are connected in turn to realize the heat exchange function between the high-grade steam and electricity of the thermal power generation system and the molten salt heat storage system. Through the mixing of steam and electricity to heat molten salt, full load peak regulation of thermal power plants can be achieved. The thermal power plant's dual-source heating molten salt energy storage system can also ensure that most of the high-grade steam heat energy is stored, and the steam turbine generator unit operates at low load, and generates electricity to further heat the molten salt for heat storage, so that the thermal power plant unit has a full-load depth Peak shaving capacity and rapid load increase capacity after peak shaving.
Description
技术领域technical field
本发明涉及储能技术领域，具体涉及一种火力发电厂双源加热熔 盐储能系统。The invention relates to the technical field of energy storage, in particular to a dual-source heating molten salt energy storage system for thermal power plants.
背景技术Background technique
火电机组燃煤热电比例高，调峰电源建设条件差，供暖期热电机 组按照“以热定电”方式运行，冬季小出力一般在60％-70％左右，冬 季供暖期调峰困难，导致全国范围内弃风弃光问题严重，不利于我国 实现调整能源结构的目标。Thermal power units have a high proportion of coal-fired heat and power, and the construction conditions of peak-shaving power sources are poor. Thermal power units operate in the way of "fixing electricity by heat" during the heating period, and the small output in winter is generally about 60%-70%. The difficulty of peak shaving during the winter heating period has led to nationwide The problem of abandoning wind and light within the scope is serious, which is not conducive to my country's realization of the goal of adjusting the energy structure.
国内已有学者提出火力发电厂熔盐储热技术，用于火力发电机组 调峰。查阅公开文献可知，当前主要技术方案包括：抽汽加热熔盐储 能、抽取部分高温再热蒸汽加热熔盐储能、抽取部分主蒸汽加热熔盐 储能。Domestic scholars have proposed molten salt heat storage technology for thermal power plants for peak shaving of thermal power plants. According to the public literature, the current main technical solutions include: extracting steam to heat molten salt for energy storage, extracting part of high-temperature reheat steam to heat molten salt for energy storage, extracting part of main steam to heat molten salt for energy storage.
目前的熔盐储热技术方案虽然能够达到储能的目的，但是只能降 低火力发电厂部分电负荷，无法达到机组深度调峰和零功率上网的目 的。部分熔盐储热系统储热能力还受限于供热负荷，部分熔盐储热系 统不能储存蒸汽相变热量，导致热量浪费。Although the current molten salt heat storage technology scheme can achieve the purpose of energy storage, it can only reduce part of the electrical load of thermal power plants, and cannot achieve the purpose of deep peak regulation and zero-power grid connection. The heat storage capacity of some molten salt heat storage systems is also limited by the heating load, and some molten salt heat storage systems cannot store the heat of vapor phase change, resulting in heat waste.
发明内容SUMMARY OF THE INVENTION
为了解决以上问题，本发明提供一种火力发电厂双源加热熔盐储 能系统，通过蒸汽和电的混合加热熔盐，可实现火力发电厂全负荷调 峰；火力发电厂双源加热熔盐储能系统也可保证高品位蒸汽热能大部 分储存起来，汽轮发电机组低负荷运行，发出电力进一步加热熔盐进 行储热，使火力发电厂机组具备全负荷深度调峰能力和调峰后迅速增 负荷能力。In order to solve the above problems, the present invention provides a dual-source heating molten salt energy storage system for thermal power plants, which can realize full-load peak regulation of thermal power plants by heating molten salt by mixing steam and electricity; thermal power plants dual-source heating molten salt The energy storage system can also ensure that most of the high-grade steam heat energy is stored, the steam turbine generator unit operates at low load, and generates electricity to further heat the molten salt for heat storage, so that the thermal power plant unit has the full-load deep peak shaving capability and the rapid peak shaving capability. load capacity.
本发明采用的技术方案是：一种火力发电厂双源加热熔盐储能系 统，包括火力发电系统、蒸汽加热熔盐系统和熔盐储热系统，其特征 在于：所述双源加热熔盐系统是电和蒸汽混合加热，由六种换热器组 成，分别与火力发电系统和熔盐储热系统连接，实现火力发电系统高 品位蒸汽和电力与熔盐储热系统之间的热交换功能。The technical scheme adopted in the present invention is: a thermal power plant dual-source heating molten salt energy storage system, comprising a thermal power generation system, a steam heating molten salt system and a molten salt heat storage system, characterized in that: the dual-source heating molten salt The system is a mixed heating of electricity and steam. It consists of six heat exchangers, which are respectively connected to the thermal power generation system and the molten salt heat storage system to realize the heat exchange function between the high-grade steam and electricity of the thermal power system and the molten salt heat storage system. .
作为优选，所述双源加热熔盐系统包括过热加热器、蒸发加热器、 预热加热器A、高压水给水泵和高压给水混温装置，所述火力发电系 统的部分高压主蒸汽经过热加热器蒸汽入口管道进入过热加热器，与 过热加热器内熔盐换热，然后经过热加热器蒸汽出口管道进入蒸发加 热器，与蒸发加热器内熔盐换热，凝结变成高压水后经预热加热器A 高压水入口管道进入预热加热器A，变成高压过冷水，最后由高压水 给水泵加压送至给水系统，实现高压蒸汽汽水循环。Preferably, the dual-source heating molten salt system includes a superheater heater, an evaporation heater, a preheating heater A, a high-pressure water feed water pump and a high-pressure feed water temperature mixing device, and part of the high-pressure main steam of the thermal power generation system is heated by heat The steam inlet pipe of the steam heater enters the superheater heater, exchanges heat with the molten salt in the superheater heater, and then enters the evaporation heater through the steam outlet pipe of the superheater heater, exchanges heat with the molten salt in the evaporation heater, and condenses into high-pressure water after pre-heating. The high-pressure water inlet pipe of the thermal heater A enters the preheating heater A, becomes high-pressure supercooled water, and finally is pressurized by the high-pressure water feed pump to the water supply system to realize the high-pressure steam steam-water cycle.
进一步的，所述双源加热熔盐系统还包括再热加热器、预热加热 器B和蒸汽压缩机，所述火力发电系统的部分高温再热蒸汽经再热加 热器蒸汽入口管道进入再热加热器，与再热加热器内熔盐换热，然后 经再热加热器蒸汽出口管道进入预热加热器B，变成低压再热蒸汽后 由蒸汽压缩机加压后送回低温再热系统，实现高温再热蒸汽汽水循环。Further, the dual-source heating molten salt system further includes a reheat heater, a preheat heater B and a steam compressor, and part of the high temperature reheat steam of the thermal power generation system enters the reheat through the steam inlet pipe of the reheat heater. The heater exchanges heat with the molten salt in the reheat heater, and then enters the preheat heater B through the steam outlet pipe of the reheat heater, and becomes low-pressure reheat steam, which is pressurized by the steam compressor and sent back to the low temperature reheat system. , to achieve high temperature reheat steam water cycle.
更进一步的，所述熔盐储热系统的低温熔盐储热罐内低温熔盐由 低温熔盐泵加压，然后分成两路熔盐，一路进入预热加热器A被加热， 另一路进入预热加热器B被加热，两路熔盐混合后进入蒸发加热器， 加热后再次分成两路熔盐，一路进入过热加热器被加热，另一路进入 再热加热器被加热，两路熔盐混合后进入熔盐电加热器组，进一步被 电加热升温，最后返回高温熔盐储热罐，实现熔盐回路的流动和储热。Further, the low temperature molten salt in the low temperature molten salt heat storage tank of the molten salt heat storage system is pressurized by the low temperature molten salt pump, and then divided into two molten salts, one enters the preheating heater A to be heated, and the other enters the preheating heater A to be heated. The preheating heater B is heated, and the two paths of molten salt are mixed and then enter the evaporation heater. After heating, it is divided into two paths of molten salt, one path enters the overheating heater to be heated, the other path enters the reheat heater to be heated, and the two paths of molten salt are heated. After mixing, it enters the molten salt electric heater group, is further heated by electric heating, and finally returns to the high-temperature molten salt heat storage tank to realize the flow and heat storage of the molten salt circuit.
更进一步的，所述熔盐储热系统的低温熔盐储热罐内低温熔盐由 低温熔盐泵加压，分成三路熔盐，第一路进入预热加热器A被加热， 第二路进入预热加热器B被加热，第一路和第二路熔盐混合后进入蒸 发加热器(；经蒸发加热器加热后再次分成两路熔盐，第一路进入过 热加热器被加热，另一路进入再热加热器被加热；第三路进入熔盐电 加热器组，直接被电加热升温；三路熔盐被加热后直接混合，并送至 高温熔盐储热罐，实现熔盐回路的流动和储热。Further, the low-temperature molten salt in the low-temperature molten salt heat storage tank of the molten salt heat storage system is pressurized by the low-temperature molten salt pump, and divided into three molten salts. The first route enters the preheating heater B to be heated, the first route and the second route of molten salt are mixed and then enter the evaporation heater (; after being heated by the evaporative heater, it is divided into two routes of molten salt again, and the first route enters the superheated heater to be heated, The other way enters the reheat heater to be heated; the third way enters the molten salt electric heater group and is directly heated by electric heating; the three way molten salt is heated and directly mixed, and sent to the high temperature molten salt heat storage tank to realize the molten salt Circuit flow and heat storage.
更进一步的，所述火力发电系统产生的高温高压蒸汽除用于直接 加热熔盐储能外，其余都用于汽轮发电机组发电，发出电力用于熔盐 电加热器组，提高熔盐储热温度，可实现火力发电厂调峰时零功率上 网和调峰后迅速增负荷。Furthermore, the high-temperature and high-pressure steam generated by the thermal power generation system is used to directly heat the molten salt for energy storage, and the rest are used for the steam turbine generator set to generate electricity, and the generated electricity is used for the molten salt electric heater set to improve the molten salt storage capacity. The thermal temperature can realize zero-power grid connection during peak shaving of thermal power plants and rapid load increase after peak shaving.
更进一步的，所述高温熔盐储热罐的工作温度为440℃。Further, the working temperature of the high-temperature molten salt heat storage tank is 440°C.
更进一步的，所述低温熔盐储热罐的工作温度为290℃。Further, the working temperature of the low-temperature molten salt heat storage tank is 290°C.
本发明取得的有益效果是：采用火力发电厂的部分高温高压蒸汽 加热熔盐，高压主蒸汽和高温再热蒸汽同时加热熔盐，将低温熔盐加 热成高温熔盐。高压主蒸汽被熔盐冷却后，变成高压凝结水，加压后 返回锅炉给水系统，完成循环加热。高温再热蒸汽经被熔盐冷却后， 变成低压再热蒸汽，由蒸汽压缩机加压后经低温再热系统返回锅炉再 热器，完成循环加热。火力发电厂的其余高温高压蒸汽送入汽轮机， 继续做功发电，并将电力用于加热熔盐储热。由此，可实现汽轮机灵 活的变负荷，同时保证锅炉和汽机的安全运行，也可实现深度调峰和 高效储热。The beneficial effects obtained by the invention are as follows: part of the high-temperature and high-pressure steam of the thermal power plant is used to heat the molten salt, the high-pressure main steam and the high-temperature reheating steam are used to heat the molten salt at the same time, and the low-temperature molten salt is heated into a high-temperature molten salt. After the high-pressure main steam is cooled by molten salt, it becomes high-pressure condensate water, which is pressurized and returned to the boiler feed water system to complete the circulating heating. After being cooled by molten salt, the high-temperature reheated steam becomes low-pressure reheated steam, which is pressurized by the steam compressor and then returned to the boiler reheater through the low-temperature reheating system to complete the cycle heating. The rest of the high-temperature and high-pressure steam in the thermal power plant is sent to the steam turbine to continue to generate power, and the electricity is used to heat the molten salt for heat storage. In this way, the flexible load change of the steam turbine can be realized, the safe operation of the boiler and the steam turbine can be ensured, and the deep peak regulation and efficient heat storage can also be realized.
本发明具有以下优点：The present invention has the following advantages:
(1)实现锅炉和汽轮机低负荷运行，使火力发电厂具备全负荷 深度调峰能力；(1) Realize low-load operation of boilers and steam turbines, so that thermal power plants have full-load deep peak shaving capabilities;
(2)调峰之后，满足电网调度迅速升负荷需求；(2) After peak shaving, meet the demand for rapid load increase in grid dispatching;
(3)储热效率较高，可以直接储存高品位蒸汽热量，尽量减少 电加热熔盐的低效率储热。(3) The heat storage efficiency is high, which can directly store high-grade steam heat, and minimize the low-efficiency heat storage of electric heating molten salt.
附图说明Description of drawings
图1为本发明的火力发电厂双源加热熔盐储能系统的流程示意 图；Fig. 1 is the schematic flow sheet of the dual-source heating molten salt energy storage system of thermal power plant of the present invention;
图2为本发明的另一种实施例；Fig. 2 is another embodiment of the present invention;
附图标记：1、常规火力发电系统；1.1、高压主蒸汽管道；1.2、 高温再热蒸汽管道；1.3、低温再热蒸汽管道；1.4、给水管道；1.5、 凝结水管道；1.6、锅炉；1.7、汽轮发电机组；2、蒸汽加热熔盐系 统；2.1、过热加热器；2.11、过热加热器蒸汽入口管道；2.12、过 热加热器熔盐出口管道；2.13、过热加热器蒸汽出口管道；2.14、过 热加热器熔盐入口管道；2.2、再热加热器；2.21、再热加热器蒸汽 入口管道；2.22、再热加热器熔盐出口管道；2.23、再热加热器蒸汽 出口管道；2.24、再热加热器熔盐入口管道；2.3、蒸发加热器；A2.4、 预热加热器；2.41、预热加热器A高压水入口管道；2.42、预热加热 器A熔盐出口管道；2.43、预热加热器A高压水出口管道；2.44、预 热加热器A熔盐入口管道；2.5、预热加热器B；2.51、预热加热器B 蒸汽出口管道；2.52、预热加热器B熔盐入口管道；2.53、预热加热 器B熔盐出口管道；2.6、蒸汽压缩机；2.61、蒸汽压缩机出口蒸汽 管道；2.7、熔盐电加热器组；2.8、高压水给水泵；2.9、高压给水 混温装置；2.91、高压给水旁通管道；3、熔盐储热系统；3.1、高温 熔盐储热罐；3.11、高温熔盐储热罐入口熔盐管道；3.2、低温熔盐 储热罐；3.3、低温熔盐泵。Reference numerals: 1. Conventional thermal power generation system; 1.1. High-pressure main steam pipeline; 1.2. High-temperature reheat steam pipeline; 1.3. Low-temperature reheat steam pipeline; 1.4. Water supply pipeline; 1.5. Condensate water pipeline; 2, steam heating molten salt system; 2.1, superheater heater; 2.11, superheater heater steam inlet pipe; 2.12, superheater heater molten salt outlet pipe; 2.13, superheater heater steam outlet pipe; 2.14, Superheat heater molten salt inlet pipe; 2.2, reheat heater; 2.21, reheat heater steam inlet pipe; 2.22, reheat heater molten salt outlet pipe; 2.23, reheat heater steam outlet pipe; 2.24, reheat Heater molten salt inlet pipe; 2.3, evaporation heater; A2.4, preheat heater; 2.41, preheat heater A high pressure water inlet pipe; 2.42, preheat heater A molten salt outlet pipe; 2.43, preheat Heater A high pressure water outlet pipe; 2.44, preheat heater A molten salt inlet pipe; 2.5, preheat heater B; 2.51, preheat heater B steam outlet pipe; 2.52, preheat heater B molten salt inlet pipe 2.53. Preheating heater B molten salt outlet pipeline; 2.6. Steam compressor; 2.61. Steam compressor outlet steam pipeline; 2.7. Molten salt electric heater group; 2.8. High-pressure water feed pump; device; 2.91, high pressure water supply bypass pipeline; 3, molten salt heat storage system; 3.1, high temperature molten salt heat storage tank; 3.11, molten salt pipeline at the entrance of high temperature molten salt heat storage tank; 3.2, low temperature molten salt heat storage tank; 3.3 , Low temperature molten salt pump.
具体实施方式Detailed ways
下面结合附图和具体实施例对本发明作更进一步的说明。The present invention will be further described below with reference to the accompanying drawings and specific embodiments.
如图1所示，火力发电厂双源加热熔盐储能系统，它包括火力发 电系统1、双源加热熔盐系统2和熔盐储热系统3，双源加热熔盐系 统2是电和蒸汽混合加热，分别与火力发电系统1和熔盐储热系统3 连接，实现火力发电系统1高品位蒸汽和电力与熔盐储热系统3之间 的热交换功能。本实施例中，火力发电系统1采用常规火力发电系统， 蒸汽加热熔盐模块和电加热熔盐模块是串联运行。As shown in Figure 1, the dual-source heating molten salt energy storage system of a thermal power plant includes a thermal power generation system 1, a dual-source heating
具体储热过程是：The specific heat storage process is:
常规火力发电系统1的部分高压主蒸汽经过热加热器蒸汽入口 管道2.11进入过热加热器2.1，与过热加热器2.1内熔盐换热，然 后经过热加热器蒸汽出口管道2.13进入蒸发加热器2.3，与蒸发加 热器2.3内熔盐换热，凝结变成高压水后经预热加热器A高压水入口 管道2.41进入预热加热器A2.4，变成高压过冷水，最后由高压水给 水泵2.8加压送至给水系统，实现高压蒸汽汽水循环。Part of the high-pressure main steam of the conventional thermal power generation system 1 enters the superheater heater 2.1 through the thermal heater steam inlet pipe 2.11, exchanges heat with the molten salt in the superheater heater 2.1, and then enters the evaporation heater 2.3 through the thermal heater steam outlet pipe 2.13, It exchanges heat with the molten salt in the evaporative heater 2.3, condenses into high-pressure water, and then enters the pre-heating heater A2.4 through the high-pressure water inlet pipe 2.41 of the preheating heater A, and becomes high-pressure supercooled water, which is finally fed by the high-pressure water to the pump 2.8 Pressurized and sent to the water supply system to realize high-pressure steam steam-water cycle.
常规火力发电系统1的部分高温再热蒸汽经再热加热器蒸汽入 口管道2.21进入再热加热器2.2，与再热加热器2.2内熔盐换热， 然后经再热加热器蒸汽出口管道2.23进入预热加热器B2.5，变成低 压再热蒸汽后由蒸汽压缩机2.6加压后送回低温再热系统，实现高温 再热蒸汽汽水循环。Part of the high-temperature reheated steam of the conventional thermal power generation system 1 enters the reheat heater 2.2 through the reheat heater steam inlet pipe 2.21, exchanges heat with the molten salt in the reheat heater 2.2, and then enters the reheat heater steam outlet pipe 2.23. The preheated heater B2.5 becomes low-pressure reheated steam and is pressurized by the steam compressor 2.6 and sent back to the low-temperature reheating system to realize the high-temperature reheated steam-water cycle.
熔盐储热系统3的低温熔盐储热罐3.2内低温熔盐由低温熔盐泵 3.3加压，然后分成两路熔盐，一路进入预热加热器A2.4被加热， 另一路进入预热加热器B2.5被加热，两路熔盐混合后进入蒸发加热 器2.3，加热后再次分成两路熔盐，一路进入过热加热器2.1被加热， 另一路进入再热加热器2.2被加热，两路熔盐混合后进入熔盐电加热 器组2.7，进一步被电加热升温，最后返回高温熔盐储热罐3.1，实 现熔盐回路的流动和储热。The low temperature molten salt in the low temperature molten salt heat storage tank 3.2 of the molten salt
常规火力发电系统1产生的高温高压蒸汽除用于直接加热熔盐 储能外，其余都用于汽轮发电机组发电，发出电力用于熔盐电加热器 组2.7，提高熔盐储热温度，可实现火力发电厂调峰时零功率上网和 调峰后迅速增负荷。The high-temperature and high-pressure steam generated by the conventional thermal power generation system 1 is used to directly heat the molten salt for energy storage, and the rest are used for the steam turbine generator set to generate electricity, and the generated electricity is used for the molten salt electric heater group 2.7 to increase the molten salt heat storage temperature, It can realize zero-power grid connection during peak shaving of thermal power plants and rapid load increase after peak shaving.
根据火力发电厂机组参数不同，高温熔盐储热罐3.1的工作温度 可能不同，常规亚临界和超临界机组参数条件下，高温熔盐储热罐 3.1的工作温度约440℃，低温熔盐储热罐3.2的工作温度约为290℃。Depending on the unit parameters of the thermal power plant, the working temperature of the high-temperature molten salt heat storage tank 3.1 may be different. Under the conditions of conventional subcritical and supercritical unit parameters, the working temperature of the high-temperature molten salt heat storage tank 3.1 is about 440℃, and the low-temperature molten salt storage tank 3.1 has a working temperature of about 440℃. The working temperature of the hot tank 3.2 is about 290°C.
另一实施例：Another example:
如图2所示，火力发电厂双源加热熔盐储能系统，它包括火力发 电系统1、双源加热熔盐系统2和熔盐储热系统3，双源加热熔盐系 统2是电和蒸汽混合加热，分别与火力发电系统1和熔盐储热系统3 连接，实现火力发电系统1高品位蒸汽和电力与熔盐储热系统3之间 的热交换功能。本实施例中，火力发电系统1采用常规火力发电系统， 蒸汽加热熔盐模块和电加热熔盐模块是并联运行。As shown in Figure 2, the dual-source heating molten salt energy storage system of a thermal power plant includes a thermal power generation system 1, a dual-source heating molten
具体储热过程是：The specific heat storage process is:
常规火力发电系统1的部分高压主蒸汽经过热加热器蒸汽入口 管道2.11进入过热加热器2.1，与过热加热器2.1内熔盐换热，然 后经过热加热器蒸汽出口管道2.13进入蒸发加热器2.3，与蒸发加 热器2.3内熔盐换热，凝结变成高压水后经预热加热器A高压水入口 管道2.41进入预热加热器A2.4，变成高压过冷水，最后由高压水给 水泵2.8加压送至给水系统，实现高压蒸汽汽水循环。Part of the high-pressure main steam of the conventional thermal power generation system 1 enters the superheater heater 2.1 through the thermal heater steam inlet pipe 2.11, exchanges heat with the molten salt in the superheater heater 2.1, and then enters the evaporation heater 2.3 through the thermal heater steam outlet pipe 2.13, It exchanges heat with the molten salt in the evaporative heater 2.3, condenses into high-pressure water, and then enters the pre-heating heater A2.4 through the high-pressure water inlet pipe 2.41 of the preheating heater A, and becomes high-pressure supercooled water, which is finally fed by the high-pressure water to the pump 2.8 Pressurized and sent to the water supply system to realize high-pressure steam steam-water cycle.
常规火力发电系统1的部分高温再热蒸汽经再热加热器蒸汽入 口管道2.21进入再热加热器2.2，与再热加热器2.2内熔盐换热， 然后经再热加热器蒸汽出口管道2.23进入预热加热器B2.5，变成低 压再热蒸汽后由蒸汽压缩机2.6加压后送回低温再热系统，实现高温 再热蒸汽汽水循环。Part of the high-temperature reheated steam of the conventional thermal power generation system 1 enters the reheat heater 2.2 through the reheat heater steam inlet pipe 2.21, exchanges heat with the molten salt in the reheat heater 2.2, and then enters the reheat heater steam outlet pipe 2.23. The preheated heater B2.5 becomes low-pressure reheated steam and is pressurized by the steam compressor 2.6 and sent back to the low-temperature reheating system to realize the high-temperature reheated steam-water cycle.
熔盐储热系统3的低温熔盐储热罐3.2内低温熔盐由低温熔盐泵 3.3加压，然后分成三路熔盐。The low temperature molten salt in the low temperature molten salt heat storage tank 3.2 of the molten salt
第一路进入预热加热器A2.4被加热，第二路进入预热加热器 B2.5被加热，两路熔盐混合后进入蒸发加热器2.3，加热后再次分成 两路熔盐；一路进入过热加热器2.1被加热，另一路进入再热加热器2.2被加热。第三路进入熔盐电加热器组2.7，直接被电加热升温。 三路熔盐被加热后直接混合，并送至高温熔盐储热罐3.1，实现熔盐 回路的流动和储热。The first path enters the preheating heater A2.4 to be heated, the second path enters the preheating heater B2.5 to be heated, and the two paths of molten salt are mixed and then enter the evaporation heater 2.3, which is divided into two paths of molten salt after heating; Into the superheat heater 2.1 is heated, the other way into the reheat heater 2.2 is heated. The third route enters the molten salt electric heater group 2.7, and is directly heated by electric heating. The three-way molten salt is directly mixed after being heated, and sent to the high-temperature molten salt heat storage tank 3.1 to realize the flow and heat storage of the molten salt circuit.
常规火力发电系统1产生的高温高压蒸汽除用于直接加热熔盐 储能外，其余都用于汽轮发电机组发电，发出电力用于熔盐电加热器 组2.7，提高熔盐储热温度，可实现火力发电厂调峰时零功率上网和 调峰后迅速增负荷。The high-temperature and high-pressure steam generated by the conventional thermal power generation system 1 is used to directly heat the molten salt for energy storage, and the rest are used for the steam turbine generator set to generate electricity, and the generated electricity is used for the molten salt electric heater group 2.7 to increase the molten salt heat storage temperature, It can realize zero-power grid connection during peak shaving of thermal power plants and rapid load increase after peak shaving.
根据火力发电厂机组参数不同，高温熔盐储热罐3.1的工作温度 可能不同，常规亚临界和超临界机组参数条件下，高温熔盐储热罐 3.1的工作温度约400℃，低温熔盐储热罐3.2的工作温度约为290℃。Depending on the unit parameters of the thermal power plant, the working temperature of the high-temperature molten salt heat storage tank 3.1 may be different. Under the conditions of conventional subcritical and supercritical unit parameters, the working temperature of the high-temperature molten salt heat storage tank 3.1 is about 400°C, and the low-temperature molten salt heat storage tank 3.1 has a working temperature of about 400°C. The working temperature of the hot tank 3.2 is about 290°C.
以上显示和描述了本发明的基本原理和主要结构特征。本发明不 受上述实例的限制，在不脱离本发明精神和范围的前提下，本发明还 会有各种变化和改进，这些变化和改进都落入要求保护的本发明的范 围内。本发明要求保护范围由所附的权利要求书及其等效物界定。The basic principles and main structural features of the present invention have been shown and described above. The present invention is not limited by the above examples, and without departing from the spirit and scope of the present invention, the present invention will also have various changes and improvements, and these changes and improvements all fall within the scope of the claimed invention. The claimed scope of the present invention is defined by the appended claims and their equivalents.
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