背压汽轮机组增设后置机的研究

  目的  为了解决机组对外供热由工业供热改为采暖供热的问题，以某热电厂为对象开展技术可行性研究。  方法  对调节阀组、双缸汽轮机、全厂共用的后置背压汽轮机、单元制带发电机的汽动给水泵组等四种方案进行了比对分析。  结果  考虑方案的特点和工程实际，最终选择了全厂共用的后置背压汽轮机方案。  结论  该方案基于能级梯级利用原则，运行可靠，经济性好，对后续机组进行供热综合改造也提供了有益的参考。

Research on Adding Post-unit for Back Pressure Steam Turbine

  Introduction  In order to solve the problem of changing the external steam supply of the unit from industrial steam to heating steam ， a thermal power plant is taken as an object to carry out technical feasibility study.  Method  Four kinds of schemes including the control valve group， the two-cylinder steam turbine， the post-unit back pressure steam turbine shared by the whole plant， and the steam-driven feed water pump unit with generator were compared and analyzed.  Result  Considering the characteristics of the schemes and project practice， the scheme of post-unit back pressure steam turbine shared by the whole plant is selected.  Conclusion  The scheme is based on the principle of energy level cascade utilization， which is reliable in operation and economical. It also provides a useful reference for the comprehensive steam supply transformation of subsequent units.