Energy supply system mainly through gas and steam combined cycle cogeneration

Abstract

The invention relates to an energy supply system mainly through gas and steam combined cycle cogeneration, and belongs to the technical field of energy sources. The system adopts a mode of combined heating of a smoke condensing heat exchanger, a condenser, a steam absorption heat pump, a high-temperature smoke heat exchanger and a steam-water heat exchanger on a heat source side; return water of a heat supply network directly recovers low-temperature smoke condensed waste heat, high-temperature smoke waste heat or condensed steam waste heat; and simultaneously, the steam absorption heat pump driven by extracted steam is used for recovering condensed steam discharged heat or partial smoke waste heat. During heat supply in winter, a client uses a supplementary-fired hot water absorption heat pump and a water-water heat exchanger to heat secondary water in the heat supply network for heat supply and extract low-grade heat for heat supply from a superficial layer soil source, an underground water source or a geothermal water source; and in summer, the client uses the hot water absorption heat pump to refrigerate hot water in the heat supply network and a liquid desiccant air conditioner to remove humidify and preheat domestic hot water. Compared with the conventional system, the system of the invention has good economy and application prospect; and the energy utilization rate of the system is greatly improved.

Description

technical field [0001] The invention proposes a new energy supply system based on gas-steam combined cycle heat and power cogeneration, which belongs to the field of energy technology. Background technique [0002] Gas cogeneration is a form of energy utilization in which heat and electricity are produced simultaneously. It uses high-grade thermal energy for power generation and low-grade thermal energy for heating, which not only improves energy utilization efficiency, but also reduces environmental pollution. Natural gas is a clean energy with high calorific value. It produces far less greenhouse gas and other harmful substances than other fossil energy sources when burned. In particular, natural gas combined heat and power has great potential in reducing carbon and air pollution emissions. The combined heat, power and cooling energy system developed on the basis of mature technologies such as combined heat and power, centralized heating and cooling, has attracted increas...

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Problems solved by technology

In particular, distributed energy supply requires base load to determine power generation capacity, and insufficient power can be supplemented by urban power grids, which exacerbates this contradiction

[0005] (2) Energy utilization is unreasonable, and cascade utilization of energy has not been realized

[0006] (3) The integrated utilization of renewable energy and gas cogeneration system is not considered

[0007] (4) High energy consumption for cooling transmission and distribution

Conventional gas-steam combined cycle heat, power, and cooling systems are generally made into centralized cooling systems in summer. Due to the disadvantages of small temperature difference and high pump consumption in conveying cold water, the pump consumption of centralized cooling for hundreds of thousands to millions of square meters generally accounts for 10% of the supply. About 5% to 10% of the cooling capacity

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