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首页> 外文期刊>Thermal engineering >The Upgrading of the Combined-Cycle Cogeneration Plant with Heat-Recovery Steam Generators for Large Cities of the Russian Federation
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The Upgrading of the Combined-Cycle Cogeneration Plant with Heat-Recovery Steam Generators for Large Cities of the Russian Federation

机译：俄罗斯联邦大城市热回收蒸汽发生器综合循环热电厂升级

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In most large cities of Russia, the annual heat consumption exceeds the annual electricity consumption more than twice as a rule. On the contrary, the electric power of the combined-cycle cogeneration heat-power plant (CCCHPP) with heat-recovery steam generators (HRSG) is much higher than the thermal power of the cogeneration extraction of its steam turbine plant. This necessitates equipping combined-cycle gas turbine–combined heat and power plants (CCGT–CHPP) with additional heat sources to cover the heat loads of the heating season, which exceed the heat capacity of the cogeneration extractions of the combined-cycle gas turbines. The article shows that the use of water-heating boilers in this capacity has a number of serious disadvantages. These disadvantages can be eliminated by equipping HRSGs with afterburner units (ABUs), which burn the gas fuel in the residual oxygen of the exhaust gases of the gas turbine engine (GTE) directly in the HRSG. The range of thermal loads can be expanded, and the efficiency of the ABU application can be significantly increased by mounting the ABUs in the HRSG downstream from the high-pressure steam superheater upstream from the high-pressure evaporator. Furthermore, it is necessary to integrate a number of new components into the HRSG configuration, such as a water low-pressure steam superheater (WLPSSH) used instead of the gas LPSSH, a reduction device, and a peak network heater included in the heating plant of the steam turbine unit as the third stage of the network water heater at high (peak) thermal loads. By the example of the PGU-450T CCCHPP, the fundamental possibility of implementing the proposed modernization of its complete HRSG without making any changes to the design of the steam turbine is shown. Since the low-pressure drum of this HRSG is additionally equipped with a deaeration unit, the upgraded HRSG of the PGU-450T plant had also to be equipped with a water condensate heater upstream from the deaerator and additional shut-off and control valves that maintain the pressure in the deaerator and assure the subcooling of the water condensate at the deaerator inlet within the permissible range of all operating modes as well as under changing thermal loads all the year round.
机译：在俄罗斯大多数大城市中，年的消费量超过年产量超过一项规则。相反，具有热回收蒸汽发生器（HRSG）的组合循环热力电厂（CCCHPP）的电力远高于其蒸汽轮机厂的热电联产的热功率。这需要将组合循环燃气涡轮机组组合的热量和发电厂（CCGT-CHPP）用附加的热源（CCGT-CHPP）覆盖加热季的热负荷，其超过组合循环燃气轮机的热电联产萃取的热量。本文表明，在这种能力中使用水加热锅炉具有许多严重缺点。这些缺点可以通过将HRSG配备有后燃单元（臂），该机组直接在HRSG中燃烧燃气涡轮发动机（GTE）的废气的残留氧气中的气体燃料。可以扩展热负荷范围，通过将高压蒸汽过热器从高压蒸发器的高压蒸汽过热器下游安装在高压蒸汽过热器下游的HRSG中，可以显着增加ABU应用的效率。此外，必须将许多新组件集成到HRSG配置中，例如使用的水低压蒸汽过热器（WLPSSH）而不是加热设备中包括的峰值网络加热器蒸汽轮机单元作为网络热量的网络热量的第三阶段。通过PGU-450T CCCHPP的示例，示出了实施其完整的HRSG的建议现代化的基本可能性，而不会对蒸汽轮机的设计进行任何改变。由于该HRSG的低压滚筒另外配备了脱气装置，因此PGU-450T厂的升级HRSG还配备了离职物的上游水冷凝水加热器，以及维护的附加关闭和控制阀除铁器中的压力并确保在所有操作模式的允许范围内的脱水剂入口处的水冷凝水中的过冷，以及整个一年的变化热负荷。

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