Efficiency of using heat pumps with various refrigerants in real steam turbine power units with PT-80 and T-250 turbines

Abstract

Prospects for increasing the efficiency of heat and electric energy-generation and heat-and-power supply at thermal power plants obviously draw attention to such modern and innovative technologies as heat pumps. Heat pumps allow efficient redistribution of energy flows. The abundance of low-potential heat carriers and heat sources in the cycle arrangement of the thermal power plants operation requires modernization of production and increase of the fuel heat utilization factor, therefore, reduction of specific fuel consumption for the production of heat and electricity. This paper analyzes the influence and practicability of introducing heat pumps into the heating circuit of the return water of the heat network of power units with PT-80 and T-250 turbines. Heat pumps of various configurations provide invariant energy conversion factor and efficiency. To assess energy and economic efficiency, modeling of the operation of power units and calculation of heat pump circuits for various refrigerants are performed. The economic effect is represented in quarterly cash savings of operating costs.

Use of Heat Pumps in the Hydrogen Production Cycle at Thermal Power Plants

“…In addition to calculating the indicators of a heat pump, the "CoolPack" (Denmark) software product is used to analyze thermodynamic cycles of HPUs and their working fluids properties. Ozone-friendly R134a is considered as the working fluid for the integrated HPU [14].…”

“…In the Russian Federation, in order to reduce the harmful impact of the produc and energy sectors on the environment, the Federal Law "About Limiting Greenh Gas Emissions" was issued [9]. Such a policy of Russia stimulates research in the fiel using secondary energy resources [10][11][12][13][14], in particular, heat pump units (HPU) [12-By 2020, fossil resources accounted for 96% of the main sources of hydrogen, of w steam reforming of natural gas is about 48% [15]. With the implementation of Net Zero E sions Scenario-the pathway for the global energy sector to achieve net zero CO2 emiss by 2050 [16]-by the International Energy Agency, as hydrogen production increases share of hydrogen produced by electrolysis will increase significantly (Figure 1).…”

“…In addition to electricity and heat, hydrogen is most often offered as an additional product [20,21], and low-grade heat is considered as an energy carrier [12][13][14]. It is assumed that during off-peak times, electricity and heat consumption can be used to produce additional technological products.…”