Double heat pump and thermoelectric unit coupled heating system and method

Abstract

The invention discloses a double heat pump and thermoelectric unit coupled heating system and method. The heating system is characterized in that a circulating cooling water outlet of a cooling towercommunicates with a heat absorption side inlet of an absorption type heat pump and a heat absorption side inlet of a compression type heat pump, a heat absorption side outlet of the absorption type heat pump and a heat absorption side outlet of the compression type heat pump communicate with a circulating cooling water inlet of the cooling tower, an air suction outlet of a turbine communicates with the heat release side of a steam heater and a driving steam inlet of the absorption type heat pump, a primary network water return pipeline communicates with a heat release side inlet of the absorption type heat pump and a heat release side inlet of the compression type heat pump, a heat release side outlet of the compression type heat pump and a heat release side outlet of the absorption type heat pump communicate with a primary network water supply pipeline, an output shaft of the turbine is connected with a driving shaft of an electric generator, and the output end of the electric generator is connected with a power grid. According to the system and the method, the flexibility of a thermoelectric unit can be effectively improved.

Description

technical field [0001] The invention belongs to the field of heating, and relates to a heating system and method in which dual heat pumps and thermoelectric units are coupled. Background technique [0002] The heat source of centralized heating in northern cities in my country is developing towards large-scale thermal power units, but with the continuous expansion of urban scale, the original thermal power units may be difficult to meet the actual heating demand. In recent years, many thermal power plants have increased the heat pump system by using high-grade steam energy to increase the low-temperature heat of a part of the circulating cooling water and release it to the primary network water supply system, thereby improving the overall heating capacity of the unit. Most of the existing heat pump systems in thermal power plants are lithium bromide absorption heat pumps. The disadvantage is that the outlet water temperature is low, generally 80-90°C, and steam heating is re...

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Problems solved by technology

The grid connection of highly volatile renewable energy power requires conventional thermal power units and thermal power units to participate in peak regulation. Thermal powe

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