CN209688798U - A molten salt heat storage and heat transfer system applied to heat and steam supply in thermal power plants - Google Patents
A molten salt heat storage and heat transfer system applied to heat and steam supply in thermal power plants Download PDFInfo
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Abstract
本实用新型公开了一种应用于热电厂供热供汽的熔盐储热换热系统，包括锅炉、高温熔盐罐、高温盐水换热器、低温盐水换热器及低温熔盐罐；锅炉的烟道内设置有熔盐加热器，熔盐加热器的出口与高温熔盐罐的入口相连通，高温熔盐罐的出口与高温盐水换热器的高温侧入口及低温盐水换热器的高温侧入口相连通，高温盐水换热器的高温侧出口及低温盐水换热器的高温侧出口与低温熔盐罐的入口相连通，低温熔盐罐的出口与熔盐加热器的入口相连通，高温盐水换热器的低温侧与外部汽轮机的供汽管道相连通，低温盐水换热器的低温侧与外部热用户的供热管道相连通，该系统能够有效提升热电厂的经济性，成本较低，且热源温度较高。
The utility model discloses a molten salt heat storage and heat exchange system for heating and steam supply in a thermal power plant, comprising a boiler, a high-temperature molten salt tank, a high-temperature salt water heat exchanger, a low-temperature salt water heat exchanger and a low-temperature molten salt tank; There is a molten salt heater in the flue, the outlet of the molten salt heater is connected to the inlet of the high-temperature molten salt tank, the outlet of the high-temperature molten salt tank is connected to the high-temperature side inlet of the high-temperature brine heat exchanger and the high-temperature side of the low-temperature brine heat exchanger The inlet is connected, the high-temperature side outlet of the high-temperature brine heat exchanger and the high-temperature side outlet of the low-temperature brine heat exchanger are connected with the inlet of the low-temperature molten salt tank, and the outlet of the low-temperature molten salt tank is connected with the inlet of the molten salt heater. The low temperature side of the brine heat exchanger is connected to the steam supply pipeline of the external steam turbine, and the low temperature side of the low temperature brine heat exchanger is connected to the heat supply pipeline of the external heat user. This system can effectively improve the economy of the thermal power plant, and the cost is low. And the heat source temperature is higher.
Description
技术领域technical field
本实用新型属于热电厂灵活性改造领域，涉及一种应用于热电厂供热供汽的熔盐储热换热系统。The utility model belongs to the field of flexible transformation of thermal power plants, and relates to a molten salt heat storage and heat exchange system applied to heat and steam supply in thermal power plants.
背景技术Background technique
在过去五年时间内，全国停建和缓建煤电产能1.5亿千瓦，淘汰落后产能0.2亿千瓦以上，实施煤电超低排放改造4.2亿千瓦、节能改造 3.4亿千瓦、灵活性改造2.2亿千瓦。通过开展火电灵活性改造可以吸纳更多的新能源。未来新能源有望成为我国能源发展的主流，加快能源技术创新，挖掘燃煤机组调峰潜力，全面提高系统调峰和新能源消纳能力势必在行，而火电开展灵活性改造亦是延展其生命周期的有效选择。如何“灵活”开展灵活性改造是必须要攻克的课题。目前，国内外较为成熟的火电灵活性改造技术有机组本体优化调整技术、等离子/微油助燃技术、热电联产机组涉及到的热电解耦技术，其中热电解耦技术又包括抽汽改造、固体蓄热技术、热泵技术、电锅炉技术和电锅炉+储热技术等多种方式。其中，抽气改造技术虽然保留了汽机发电能力，投资也相对较小，但是存在蒸汽量提升有限的不足，固体蓄热技术耗电量大，经济性较差；而热泵技术存在造价高，热源温度相对较低，无法对高品质热源进行热电解耦。In the past five years, 150 million kilowatts of coal-fired power production capacity has been suspended or postponed nationwide, more than 20 million kilowatts of outdated production capacity have been eliminated, 420 million kilowatts of ultra-low emission transformations of coal power plants, 340 million kilowatts of energy-saving transformations, and 220 million kilowatts of flexible transformations have been implemented. . More new energy can be absorbed through the flexible transformation of thermal power. In the future, new energy is expected to become the mainstream of my country's energy development. Accelerating energy technology innovation, tapping the peak-shaving potential of coal-fired units, and comprehensively improving the system's peak-shaving and new energy consumption capabilities is bound to be done, and the flexible transformation of thermal power is also to extend its life. A valid choice of period. How to "flexibly" carry out flexible transformation is a topic that must be overcome. At present, the relatively mature thermal power transformation technology at home and abroad includes optimization and adjustment technology of organic unit body, plasma/micro-oil combustion technology, and thermoelectric decoupling technology involved in cogeneration units, of which thermoelectric decoupling technology includes steam extraction transformation, solid Heat storage technology, heat pump technology, electric boiler technology and electric boiler + heat storage technology and other methods. Among them, although the gas extraction transformation technology retains the power generation capacity of the steam turbine, the investment is relatively small, but there is a shortage of limited increase in the amount of steam, the solid heat storage technology consumes a lot of power, and the economy is poor; while the heat pump technology has high cost and heat source Relatively low temperatures preclude thermoelectric decoupling of high-quality heat sources.
实用新型内容Utility model content
本实用新型的目的在于克服上述现有技术的缺点，提供了一种应用于热电厂供热供汽的熔盐储热换热系统，该系统能够有效提升热电厂的经济性，成本较低，且热源温度较高。The purpose of the utility model is to overcome the above-mentioned shortcomings of the prior art, and provide a molten salt heat storage and heat exchange system for heating and steam supply in thermal power plants. The temperature is higher.
为达到上述目的，本实用新型所述的应用于热电厂供热供汽的熔盐储热换热系统包括锅炉、高温熔盐罐、高温盐水换热器、低温盐水换热器及低温熔盐罐；In order to achieve the above purpose, the molten salt heat storage and heat exchange system for heating and steam supply in thermal power plants described in the utility model includes a boiler, a high-temperature molten salt tank, a high-temperature salt water heat exchanger, a low-temperature salt water heat exchanger, and a low-temperature molten salt tank ;
锅炉的烟道内设置有熔盐加热器，熔盐加热器的出口与高温熔盐罐的入口相连通，高温熔盐罐的出口与高温盐水换热器的高温侧入口及低温盐水换热器的高温侧入口相连通，高温盐水换热器的高温侧出口及低温盐水换热器的高温侧出口与低温熔盐罐的入口相连通，低温熔盐罐的出口与熔盐加热器的入口相连通，高温盐水换热器的低温侧与外部汽轮机的供汽管道相连通，低温盐水换热器的低温侧与外部热用户的供热管道相连通。A molten salt heater is installed in the flue of the boiler, the outlet of the molten salt heater is connected with the inlet of the high-temperature molten salt tank, the outlet of the high-temperature molten salt tank is connected with the high-temperature side inlet of the high-temperature brine heat exchanger and the The high-temperature side inlet is connected, the high-temperature side outlet of the high-temperature brine heat exchanger and the high-temperature side outlet of the low-temperature brine heat exchanger are connected with the inlet of the low-temperature molten salt tank, and the outlet of the low-temperature molten salt tank is connected with the inlet of the molten salt heater , the low-temperature side of the high-temperature brine heat exchanger is connected with the steam supply pipeline of the external steam turbine, and the low-temperature side of the low-temperature brine heat exchanger is connected with the heat supply pipeline of the external heat user.
所述熔盐加热器为蛇形结构，且沿横向布置。The molten salt heater has a serpentine structure and is arranged laterally.
所述高温盐水换热器及低温盐水换热器均为管壳式换热器。Both the high-temperature brine heat exchanger and the low-temperature brine heat exchanger are shell-and-tube heat exchangers.
熔盐加热器布置于锅炉的水平烟道内。The molten salt heater is arranged in the horizontal flue of the boiler.
高温盐水换热器的高温侧入口处及高温侧出口处均设置有第一阀门。First valves are arranged at the high temperature side inlet and the high temperature side outlet of the high temperature brine heat exchanger.
低温盐水换热器的高温侧入口处及高温侧出口处均设置有第二阀门。Second valves are arranged at the high temperature side inlet and the high temperature side outlet of the low temperature brine heat exchanger.
低温熔盐罐与熔盐加热器之间设置有低温熔盐泵。A low temperature molten salt pump is arranged between the low temperature molten salt tank and the molten salt heater.
熔盐加热器的出口经高温熔盐泵与高温熔盐罐的入口相连通。The outlet of the molten salt heater communicates with the inlet of the high temperature molten salt tank through the high temperature molten salt pump.
本实用新型具有以下有益效果：The utility model has the following beneficial effects:
本实用新型所述的应用于热电厂供热供汽的熔盐储热换热系统在具体操作时，在热电厂炉膛的烟道内安装熔盐加热器，利用熔盐加热器对熔盐进行加热，然后将加热后的熔盐存储于高温熔盐罐中，当需要为热用户供热或者向汽轮机补充蒸汽时，则通过高温熔盐罐中的高温熔岩对水进行加热，以实现热用户的供热及汽轮机的蒸汽补充，在一定程度上节省了燃煤，降低了锅炉煤耗，并且结构简单，布置灵活，热源温度较高，在实际操作时，可以根据热源温度要求，将熔盐加热器布置安装在锅炉炉膛烟道内相匹配的温度位置，系统运行成本低，充分利用热电厂锅炉烟道热量，为热用户及汽轮机供热供汽，以提升热电厂的经济性。During the specific operation of the molten salt heat storage and heat exchange system for heating and steam supply in a thermal power plant described in the utility model, a molten salt heater is installed in the flue of the furnace of the thermal power plant, and the molten salt is heated by the molten salt heater, and then The heated molten salt is stored in the high-temperature molten salt tank. When it is necessary to provide heat for the heat user or to supplement the steam for the steam turbine, the water is heated by the high-temperature lava in the high-temperature molten salt tank to realize the heat supply for the heat user. And the steam supplement of the steam turbine saves coal to a certain extent, reduces the coal consumption of the boiler, and has a simple structure, flexible layout, and high heat source temperature. In actual operation, the molten salt heater can be arranged and installed according to the heat source temperature requirements. In the matching temperature position in the flue of the boiler furnace, the operating cost of the system is low, and the heat of the flue of the boiler of the thermal power plant is fully utilized to provide heat and steam for heat users and steam turbines, so as to improve the economy of the thermal power plant.
附图说明Description of drawings
图1为本实用新型的结构示意图。Fig. 1 is the structural representation of the utility model.
其中，1为锅炉、2为熔盐加热器、3为低温熔盐罐、4为高温熔盐罐、5为高温盐水换热器、6为低温盐水换热器。Among them, 1 is a boiler, 2 is a molten salt heater, 3 is a low-temperature molten salt tank, 4 is a high-temperature molten salt tank, 5 is a high-temperature brine heat exchanger, and 6 is a low-temperature brine heat exchanger.
具体实施方式Detailed ways
下面结合附图对本实用新型做进一步详细描述：Below in conjunction with accompanying drawing, the utility model is described in further detail:
参考图1，本实用新型所述的应用于热电厂供热供汽的熔盐储热换热系统包括锅炉1、高温熔盐罐4、高温盐水换热器5、低温盐水换热器 6及低温熔盐罐3；锅炉1的烟道内设置有熔盐加热器2，熔盐加热器2 的出口与高温熔盐罐4的入口相连通，高温熔盐罐4的出口与高温盐水换热器5的高温侧入口及低温盐水换热器6的高温侧入口相连通，高温盐水换热器5的高温侧出口及低温盐水换热器6的高温侧出口与低温熔盐罐3的入口相连通，低温熔盐罐3的出口与熔盐加热器2的入口相连通，高温盐水换热器5的低温侧与外部汽轮机的供汽管道相连通，低温盐水换热器6的低温侧与外部热用户的供热管道相连通。Referring to Fig. 1, the molten salt heat storage and heat exchange system applied to thermal power plants for heating and steam supply according to the utility model includes a boiler 1, a high-temperature molten salt tank 4, a high-temperature brine heat exchanger 5, a low-temperature brine heat exchanger 6 and a low-temperature brine heat exchanger. Molten salt tank 3; a molten salt heater 2 is arranged in the flue of the boiler 1, the outlet of the molten salt heater 2 is connected to the inlet of the high-temperature molten salt tank 4, and the outlet of the high-temperature molten salt tank 4 is connected to the high-temperature brine heat exchanger 5 The high-temperature side inlet of the high-temperature brine heat exchanger 6 is connected with the high-temperature side inlet of the low-temperature brine heat exchanger 6, the high-temperature side outlet of the high-temperature brine heat exchanger 5 and the high-temperature side outlet of the low-temperature brine heat exchanger 6 are connected with the inlet of the low-temperature molten salt tank 3, The outlet of the low-temperature molten salt tank 3 is connected with the inlet of the molten salt heater 2, the low-temperature side of the high-temperature brine heat exchanger 5 is connected with the steam supply pipeline of the external steam turbine, and the low-temperature side of the low-temperature brine heat exchanger 6 is connected with the external heat user The heating pipes are connected.
具体的，所述熔盐加热器2为蛇形结构，且沿横向布置；所述高温盐水换热器5及低温盐水换热器6均为管壳式换热器；熔盐加热器2布置于锅炉1的水平烟道内。Specifically, the molten salt heater 2 has a serpentine structure and is arranged laterally; the high-temperature brine heat exchanger 5 and the low-temperature brine heat exchanger 6 are both shell-and-tube heat exchangers; the molten salt heater 2 is arranged In the horizontal flue of boiler 1.
高温盐水换热器5的高温侧入口处及高温侧出口处均设置有第一阀门；低温盐水换热器6的高温侧入口处及高温侧出口处均设置有第二阀门；低温熔盐罐3与熔盐加热器2之间设置有低温熔盐泵；熔盐加热器 2的出口经高温熔盐泵与高温熔盐罐4的入口相连通。The high-temperature side inlet and the high-temperature side outlet of the high-temperature brine heat exchanger 5 are provided with a first valve; the low-temperature brine heat exchanger 6 is provided with a second valve at the high-temperature side inlet and high-temperature side outlet; the low-temperature molten salt tank 3 and the molten salt heater 2 are provided with a low-temperature molten salt pump; the outlet of the molten salt heater 2 is connected to the inlet of the high-temperature molten salt tank 4 through the high-temperature molten salt pump.
本实用新型的具体工作过程为：Concrete work process of the present utility model is:
低温熔盐罐3中的熔盐经低温熔盐泵进入到熔盐加热器2中吸收热量，然后经高温熔盐泵进入到高温熔盐罐4中，当热用户需要供热时，高温熔盐罐4内的高温熔岩进入到低温盐水换热器6的高温侧中，以加热低温盐水换热器6低温侧中的水，再将加热后的水作为热用户的给水；当电厂汽轮机需要补充蒸汽时，高温熔盐罐4中的高温熔岩进入到高温盐水换热器5的高温侧中，将高温盐水换热器5低温侧中的水加热为汽轮机所需温度及压力的蒸汽，然后补充到汽轮机中，从而一定程度上节省燃煤，降低锅炉1的煤耗。The molten salt in the low-temperature molten salt tank 3 enters the molten salt heater 2 to absorb heat through the low-temperature molten salt pump, and then enters the high-temperature molten salt tank 4 through the high-temperature molten salt pump. The high-temperature lava in the salt tank 4 enters the high-temperature side of the low-temperature brine heat exchanger 6 to heat the water in the low-temperature side of the low-temperature brine heat exchanger 6, and then use the heated water as the feed water for the heat user; when the power plant steam turbine needs When replenishing steam, the high-temperature lava in the high-temperature molten salt tank 4 enters the high-temperature side of the high-temperature brine heat exchanger 5, and the water in the low-temperature side of the high-temperature brine heat exchanger 5 is heated to steam at the temperature and pressure required by the steam turbine, and then Supplemented into the steam turbine, thereby saving coal to a certain extent and reducing the coal consumption of the boiler 1.
以上所述，仅为本实用新型专利较佳的具体实施方式，但本实用新型专利的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本实用新型专利揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本实用新型专利的保护范围之内。因此，本实用新型专利的保护范围应该以权利要求的保护范围为准。The above is only a preferred embodiment of the utility model patent, but the scope of protection of the utility model patent is not limited thereto. Anyone familiar with the technical field within the technical scope disclosed in the utility model patent, Easily conceivable changes or replacements should be covered within the protection scope of the utility model patent. Therefore, the protection scope of the utility model patent should be based on the protection scope of the claims.
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| CN115680882A (en) * | 2022-10-28 | 2023-02-03 | 中国华能集团清洁能源技术研究院有限公司 | A heat storage system and working method based on a gas turbine |
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| CN115680882A (en) * | 2022-10-28 | 2023-02-03 | 中国华能集团清洁能源技术研究院有限公司 | A heat storage system and working method based on a gas turbine |
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