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 matematical model of the heat and power plant was tailored to the current state of the study object according to the three-stage 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 g.s.s.f./kWh. The operating costs to implement the proposed engineering solutions amounted to 34,191 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 18,423 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
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 three stage 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
Summary
Исследования на основе математического моделирования энергоблока No 5 ТЭЦ-10 ООО «Байкальская Энергетическая. Резюме: Цель – исследование изменения схемы слива дренажей регенерации низкого давления на энергетическую и экономическую эффективность работы энергоблока No 5 ТЭЦ-10 ООО «Байкальская Энергетическая Компания». Построенная математическая модель теплоэнергетической установки настраивалась с учетом текущего состояния объекта исследования в соответствии с трехэтапной методикой идентификации параметров математических моделей. Модернизированная математическая модель энергоблока позволяет производить расчет параметров установки для действующей и предложенной тепловых схем. Предложенный подход, объединяющий аппарат математического моделирования действующих энергоустановок с методикой повышения эффективности принятия технических решений, является универсальным и может применяться для модернизации теплоэнергетических и других установок. Благодарности: Работа выполнена в рамках проекта государственного задания (No FWEU-2021-0005) программы фундаментальных исследований РФ на 2021–2030 гг. Исследования на основе математического моделирования энергоблока No 5 ТЭЦ-10 ООО «Байкальская Энергетическая Компания» для оценки эффективности его модернизации. Mathematical modelling of the CHP plant-10 power unit No 5 of “Baikal Energy Company” LLC to assess the efficiency of its modernisation
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