Integrated oxygen transmission membrane (OTM) pressurized carbon dioxide (CO2) zero-emission solid oxide fuel cell (SOFC)/gas transmission (GT)/air transmission (AT)/steam turbine (ST) composite power system

Abstract

The invention belongs to the technical field of pressurized carbon dioxide (CO2) zero-emission solid oxide fuel cell (SOFC) composite power generation, in particular to an integrated oxygen transmission membrane (OTM) pressurized CO2 zero-emission SOFC / gas transmission (GT) / air transmission (AT) / steam turbine (ST) composite power system. An SOFC / GT / ST composite power system which is free from recycling CO2 is adopted as a benchmark system to integrate the OTM, the high temperature AT and a CO2 recycling unit to obtain a CO2 zero-emission composite power system which has high efficiency, saves energy and is environment-friendly, so the energy of the system can be adequately and efficiently utilized in a gradient way, the efficiency is high, only CO2 and H2O are discharged after the combustion, so the CO2 is convenient to separate and collect, the power consumption can be reduced, and high efficiency can be realized after the CO2 is recycled.

Description

technical field [0001] The present invention belongs to pressurized CO 2 The technical field of zero-emission solid oxide fuel cell hybrid power generation, especially related to a pressurized CO with integrated OTM 2 Zero-emission SOFC / GT / AT / ST hybrid power system. Background technique [0002] Solid oxide fuel cells use electrochemical processes to directly generate electricity, are not restricted by Carnot's theorem, have high efficiency, and their exhaust gas has a high temperature, and can be used with gas turbines and waste heat boilers under pressurized conditions Combined with a steam turbine to form an efficient power generation system. And because of its unique mechanism: fuel and air are not mixed directly, avoiding the N 2 to CO 2 Blending, which provides convenient conditions for improving energy power system efficiency and reducing emissions. The working temperature of OTM is usually 700-1000°C, and the cathode exhaust gas of the battery stack can directly...

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Problems solved by technology

[0003] The present invention does not recover CO 2 SOFC (Solid Oxide Fuel Cell) / GT (Gas Turbine) / ST (Steam Turbine) hybrid power system is the benchmark system, integrating oxygen ion transport membrane (OTM), high temperature air turbine (AT) and CO 2 Recovery unit to solve the problem of low efficiency and large amount of polluting gas emissions in traditional power generation systems, avoiding the recovery of CO in traditional power systems 2 When N 2 to CO 2 The blending dilution greatly reduces the separation and recovery of CO 2 The energy consumption of the process and the overall efficiency of the system can also be maintained at a high level

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