Recycling combined cooling heating and power system

Abstract

The invention relates to a recycling combined cooling heating and power system. Fuel is combusted in an engine to generate electric energy which is supplied to an external power grid, waste gas emitted from the engine is inputted to drive a lithium bromide cold-hot water unit to refrigerate or supply heat, gas emitted from the lithium bromide cold-hot water unit flows through a primary low-temperature gas-gas heater, and waste gas outputted from the primary low-temperature gas-gas heater enters a secondary low-temperature gas-gas heater through a waste heat pipeline. A heat-carrying agent loop in the secondary low-temperature gas-gas heater is connected with an evaporator, the evaporator, a compressor, a condenser and a throttle valve form a refrigerant loop, and the condenser in the refrigerant loop is connected with a heating hot-water loop. Sensible heat and most of condensation heat of flue gas are recycled through the secondary low-temperature gas-gas heater, and heat collected after flue gas emission is transferred to the refrigerant loop through the heat-carrying agent loop to provide hot water for heating. Recycling of low-temperature gas emitted by the combined cooling heating and power system is realized, and energy utilization rate of the combined cooling heating and power system is greatly increased.

Description

technical field [0001] The invention belongs to the field of distributed energy, and relates to a combined cooling, heating and power energy supply system. technical background [0002] Distributed cooling, heating and power trigeneration system is one of the main forms of distributed energy system at present. The published "Research on Unit Consumption Analysis Model of Distributed Cooling, Heating, and Power Triple System" ("Journal of Engineering Thermophysics", Volume 28, No. 6, November 2007) discloses a typical natural gas distributed cooling, heating and power Triple supply system, such as figure 1 As shown, the system takes power generation equipment as the core, and natural gas is burned in the engine to generate electricity to be supplied to the external power grid, or part of the electricity is used to drive heat pumps for cooling or heating for self-use, commonly known as the first-level energy utilization. The high-temperature exhaust gas emitted by the engine...

AI Technical Summary

Problems solved by technology

Generally, the thermal efficiency of distributed natural gas combined cooling, heating and power supply is between 70% and 90%, and the exhaust gas temperature is usually above 120°C. Due to the problem of low-temperature waste heat utilization technology, the existing technology cannot further improve the combined cooling, heating and power supply system. energy efficiency

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