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820 Annual after-tax Annual after-tax 650 0.2 0.3 0.4 0.5 0.6 Price of the electricity / (RMB/kWh) Energies 2020, 13, 6256 Figure 16. Annual after-tax profits vs. the price of the electricity. 16 of 19 Figure 17. Rate of return on the initial investment vs. the price of the electricity. Figure 17. Rate of return on the initial investment vs. the price of the electricity. 5. Conclusions 5. Conclusions On the basis ofOhnetahteinbagsisloafdhecahtinagralocatderchisatriactse,ritshtiecs,dtehesidgensigindeidaeaooffaawastetehheaetaretcroevceroyvseyrstyemsystem with a levels, two connection types of heating supply systems were proposed. According to the relationship the relationship between the heating network load and the design power of the heat pump, four operating modes of the heat pump were discussed. An economic analysis model of the waste heat between the heating network load and the design power of the heat pump, four operating modes of recovery system was proposed to optimize the design power of the heat pump. Finally, a detailed the heat pump were discussed. An economic analysis model of the waste heat recovery system was quantitative economic analysis of the waste heat recovery system is carried out with a typical unit. proposedtooptTihmemizaeintchoencdluesisoingsnarepsouwmmearriozefdthasefohlloewast:pump.Finally,adetailedquantitativeeconomic analysis of the waste heat recovery system is carried out with a typical unit. The main conclusions are summarized as follows: • Throughout the heating period, with the change in the outdoor temperature, changes in the heating load of the heating network will affect the actual output power of the heat pump with a determined design power. As the outdoor temperature increases, the actual output power of the heat pump first increases and then decreases, reaching the maximum value at a certain outdoor temperature in the middle. • As the heating load of the heating network is constantly changing during the heating period, the actual output power characteristics of heat pumps with different design powers are quite different, which causes the waste heat recovery system to operate at different modes. When the design power of the heat pump is lower than the minimum load of the heating network, the heat pump can always operate at the design power. However, when the design power of the heat pump is higher than the minimum load of the heating network, the heat pump can only operate under partial load in certain periods. Therefore, the reasonable selection of the design power heat pump is crucial to improve the economy of the waste heat recovery system. • The economic analysis of a 135 MW unit shows that the key parameters affecting the efficiency of the waste heat recovery system are the unit price of the recovery system and the heating price. Under the condition that the design power of the heat pump is 101.0 MW, when the unit price changes from 10 × 104 to 40 × 104 RMB/MW, the annual after-tax profit decreases from 910 × 104 to 652 × 104 RMB and the rate of return on the initial investment decreases from 90% to 20%. When the heating price changes from 20 to 40 RMB/GJ, the annual after-tax profit of the system increases from 382 × 104 to 1535 × 104 RMB and the rate of return on the initial investment increases from 19.0% to 76.0%. Therefore, a lower unit price of the recovery system or a higher heating price would considerably increase the efficiency of the system. In northern China, the combined heat and power plant is usually applied for urban heating, and is located in the place around heat consumers. The operation model of the cogeneration unit adopts the following heating load mode, which means that the unit gives priority to the heating load and the amount of electricity is determined by the heating load. When the heating load changes, the electricity generation capacity of the thermal power plant changes accordingly. As we know, due to 815 with a heat pump was presented in this paper. In order to satisfy the heating demand of different heat pump was presented in this paper. In order to satisfy the heating demand of different temperature temperature levels, two connection types of heating supply systems were proposed. According toPDF Image | Waste Heat Recovery Turbine Exhaust Steam Heat Pump
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