ELECTRIC POWER PEAK-SHAVING AND COMBINED HEAT AND POWER WASTE HEAT RECOVERY DEVICE AND OPERATION METHOD THEREOF

摘要

The invention relates to an electric peaking combined heat and power (CHP) waste heat recovery device and an operating method thereof. The device comprises an inner power plant portion and a heat exchange station portion, wherein the inner power plant portion comprises a heat exchanger, a waste heat recovery electric heat pump, an energy-storing electric heat pump, high/low temperature water storing tanks, a heating network heater, a valve and a circulating water pump; the heat exchange station portion mainly comprises high/low temperature water storing tanks, an electric heat pump, a heat exchanger, a valve and a circulating water pump; as for the operating method of the device, the device can operate in periods of an electrical load trough, an electrical load flat and an electrical load peak respectively through combination of different valve switches, the high temperature water storing tank is used for balancing the difference between system heat supply amount and heating load, the low temperature water storing tank is used for stabilizing steam exhaust waste heat recovery amount, thereby, the problem that the electricity generation peaking capacity is limited due to mutual coupling of electricity generation and heat supply in traditional operating modes of ‘heat determines electricity’ is solved, a CHP unit can participate in power grid load regulation, the power grid regulating capacity can be improved so as to deal with the condition of constantly increasing of electrical load trough-to-peak difference, and the absorptive capacity of a power grid for wind power generation can be improved so as to reduce phenomena of ‘fan suspending’.

主权项

1. An electric peaking combined heat and power (CHP) waste heat recovery device, comprising:
an inner power plant portion; and a heat exchange station portion;wherein the inner power plant portion comprises a heat exchanger (1), a waste heat recovery electric heat pump (2), an energy-storing electric heat pump (3), a high temperature water storing tank (4), a low temperature water storing tank (5), a heating network heater (6), valves (11-19) and circulating water pumps (20-23); wherein an inlet of the heat exchanger (1) is connected to a primary network backwater pipe (1-1), and an outlet of the heat exchanger (1) is connected to inlets of the valve (11), the valve (12) and the circulating water pump (20) in parallel, respectively; an inlet of the waste heat recovery electric heat pump (2) is connected to an outlet of the valve (12), and an outlet of the waste heat recovery electric heat pump (2) is connected to an inlet of the heating network heater (6); a top inlet/outlet of the high temperature water storing tank (4) is connected to an outlet of the valve (13) and an inlet of the valve (14) in parallel, respectively, an inlet of the valve (13) is connected to an outlet of a condenser of the energy-storing electric heat pump (3) and an outlet of the valve (14) is connected to the inlet of the heating network heater (6); a bottom inlet/outlet of the high temperature water storing tank is connected to an outlet of the valve (15) and an inlet of the circulating water pump (21) in parallel, respectively, an inlet of the valve (15) is connected to an outlet of the circulating water pump (20), and an outlet of the circulating water pump (21) is connected to an inlet of the condenser of the energy-storing electric heat pump (3) via the valve (16); a top inlet/outlet of the low temperature water storing tank (5) is connected to an outlet of the valve (11) and an inlet of the valve (17) in parallel, respectively, and an outlet of the valve (17) is connected to an inlet of an evaporator of the energy-storing electric heat pump (3); a bottom inlet/outlet of the low temperature water storing tank (5) is connected to an outlet of the valve (18) and an inlet of the circulating water pump (22) in parallel, respectively, an inlet of the valve (18) is connected to an outlet of the evaporator of the energy-storing electric heat pump (3) via the circulating water pump (23), and an outlet of the circulating water pump (22) is connected to the inlet of the heat exchanger (1) in parallel via the valve (19);wherein the heat exchange station portion comprises a high temperature water storing tank (7), a low temperature water storing tank (8), an electric heat pump (9), a heat exchanger (10), valves (24-35) and a circulating water pump (36-37); wherein a top inlet/outlet of the high temperature water storing tank (7) is connected to an outlet of a valve (24) and an inlet of the circulating water pump (36) in parallel, respectively, an inlet of the valve (24) is connected to an outlet of the heating network heater (6) via a primary network water supply pipe (1-2), an outlet of the circulating water pump (36) connected to the primary network water supply pipe (1-2) in parallel via the valve (25) is connected to an inlet of the valve (26), and an outlet of the valve (26) is connected to an inlet of a primary network of the heat exchanger (10); a bottom inlet/outlet of the high temperature water storing tank (7) is connected to an outlet of the valve (27) and an inlet of the valve (28) in parallel, respectively, an inlet of the valve (27) is connected to an outlet of the primary network of the heat exchanger (10), and an outlet of the valve (28) is connected to an inlet of an evaporator of the electric heat pump (9); a top inlet/outlet of the low temperature water storing tank (8) is also connected to the outlet of the valve (27) and the inlet of the valve (28) in parallel, respectively, a bottom inlet/outlet of the low temperature water storing tank (8) is connected to an outlet of the valve (29) and an inlet of the valve (30) in parallel, respectively, and an outlet of the valve (30) is connected to the primary network backwater pipe (1-1); an outlet of the evaporator of the electric heat pump (9) is connected to an inlet of the circulating water pump (37) and the primary network backwater pipe (1-1) in parallel via the valve (31), respectively, and an outlet of the circulating water pump (37) is connected to an inlet of the valve (29); a secondary network backwater pipe (1-3) is connected to inlets of the valve (32) and the valve (33) in parallel, respectively, an outlet of the valve (32) is connected to an inlet of the secondary network of the heat exchanger (10), both outlets of the valve (33) and the secondary network of the heat exchanger (10) are connected to inlets of the valve (34) and the valve (35) in parallel, respectively, an outlet of the valve (35) is connected to a secondary network water supply pipe (1-4), an outlet of the valve (34) is connected to an inlet of a condenser of the electric heat pump (9), and an outlet of the condenser of the electric heat pump (9) is connected to the secondary network water supply pipe (1-4).