Abstract
The work aims to study the effect of changes in the drain scheme of the low-pressure regeneration on the energy and economic efficiency of the CHP plant-10 power unit No 5 of “Baikal Energy Company” LLC. In this study, we used a mathematical model of the power unit adjusted to the measurements results. The mathematical modelling of the power unit was performed using the “Computer-assisted programming system” application package. The created mathematical model of the heat and power plant was tailored to the current state of the study object according to the threestage identification procedure of the mathematical model parameters. We proposed a cycle arrangement under which three streams of the low-pressure drainages were redirected to the pump suction of the low-pressure heater. The improved mathematical model of the power unit allows the calculation of the parameters of both the existing and proposed cycle arrangements. According to the calculations, the temperature difference between the main condensate after the low-pressure heater 1 and the investigated drains after mixing is minimal and amounts to 3.2 °C. The suggested modernisation increases the energy efficiency of the power unit by 0.007% under the nominal operating conditions of the existing and proposed thermal circuit. In addition, the specific standard fuel consumption for electric generation is reduced by 0.052 gram of conventional fuel / kW·h. The operating costs to implement the proposed engineering solutions amounted to 34191 roubles. Considering the annual power plant extensive consumption factor, the payback period of the proposed modernisation will be 5.5 months. The savings for the first operation year are estimated at 18423 roubles, based on the rate of return and depreciation expenses. The proposed approach combines mathematical modelling of operating power plants with a technique of increasing the efficiency of technical decision-making. The proposed versatile approach can be used for the modernisation of CHPs and other plants.
Highlights
Improving the efficiency of the burned fuel using in power plants is one of the most important tasks facing the modern energy industry
In the thermal scheme of the power unit, the authors identified a number of drains that reduce the efficiency of its operation
In the current thermal scheme of the power unit No 5 of the CHP-10 of LLC "Baikal Energy Company", a number of heat flows were identified that reduce the efficiency of its operation
Summary
Improving the efficiency of the burned fuel using in power plants is one of the most important tasks facing the modern energy industry. The author, in addition to other changes in the thermal scheme, determined the heat flow of the low pressure heater (LPH-1) working steam drain, which in the scheme in force at that time merged into the turbine condenser. It is of scientific interest to develop additional methods and recommendations related directly to the assessment of the economic efficiency of design, technological and organizational and technical developments in the field of operation of technical means, devices and systems Taking this into account, in this paper, a detailed mathematical model is used to evaluate the effectiveness of the proposed changes, which is adjusted with sufficient accuracy to the actual operating modes of the equipment. The final stage is a comprehensive comparative analysis of the current and upgraded thermal scheme of the power unit according to generalized economic indicators, taking into account the criteria of operational reliability, and the formulation of conclusions
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
