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Improving the efficiency of cogeneration steam turbines of powerful power units of heat power stations


Authors: Babenko O.A., Pasсhenko N.V., Senetskyi O.V.

Presentedby the Podgorny Institute for Mechanical Engineering Problems of the National Academy of Sciences of Ukraine.

An important scientific and technical problem of improving the efficiency of HPS steam turbines at the expense of optimization of their operation and the creation new highly efficient flow parts of cogeneration turbines is solved.

An economical solution to the problem of distribution of heat loads between network heaters of cogeneration turbines during the heating period is presented. The calculations were performed using the software package SCAT which develops in IPMash NASof Ukraine. Optimum modes of heat supply from cogeneration turbines are defined for the first time (acts of implementation are confirmed). The proposed processes for preparing additional electric power can be used for cogeneration turbines with types of turbines T-50/60-130, T-100/120-130, T-180/210-130, T-250/300-240 and their modifications.

The carrying out of calculations of three-dimensional turbulent flows in flow parts of turbines using modern software systems is an effective direction of increase efficiency of power equipment. For the numerical research of three-dimensional currents steam in the flowing part of the steam turbine software package IPMFlow, developed in IPMash NAS of Ukraine is used.

With the use of software package IPMFlow the researches of three-dimensional currents steam in the flowing part of MPC the steam turbine series T-100-130 are carried, which showed the feasibility of optimizing the geometry of the flow part in order to improve gas-dynamic characteristics of blades apparatuses.

The scientific works of the authors, which reveals the topicality saving fuel resources through the production of additional electric power from HPS turbines, are indicated on a global level. To solve this problem new methods are used that save fuel and energy resources without additional capital investment.

The economic effect ofthe introduction:

1) The use of the method of optimal allocation of heat load between network heaters during the heating period (180 days) with account of change the outside temperature -11 ≤ tot ≤ 10 °C allows, compared with the adopted (), significant fuel due to the additional production of electricity saving at power turbines T-100/120-130 in the volume 3,500 tons of fuel equivalent, which is equivalent to saving 3 million m3 of natural gas.

2) Numerous researches of two variants of steam turbines T-120/130-12,8 MPC (existing turbine) and T-125/150-12,8 (new turbine) are satisfied. It is shown the new turbine through the use of modern blade profiles and seals, changing the shape of the meridional contours, have much higher efficiency of MPC. Thus, the MPC efficiency taking into account the losses from humidity increased by 2.2 % and amounted to 90.1 %.

Scientificresults are reflected in thedissertationsof candidate of sciences, 1 monograph, 14 articlesand 17 reports at conferences. Novelty and competitive technical solutions protected by four patents.

Total number of author's publications– 39.