Thermal control system of fixed mini-type fuel cell cogeneration device

Abstract

The invention relates to a thermal control system of a fixed mini-type fuel cell cogeneration device. A gas path entering a fuel cell galvanic pile is a normal working gas path; high-temperature hydrogen-enriching mixed gas flow generated by a fuel reforming unit enters a No.1 heat exchanger through a pipeline, passes through an outlet of the No.1 heat exchanger and then enters a positive electrode plate through a No.1 solenoid valve for power generation; high-temperature tail gas discharged from the positive electrode plate enters a No.2 heat exchanger through a one-way valve, then enters a condenser to be subjected to water-steam separation and then flows back to the reforming unit for cyclic utilization respectively; a cooling water pump is communicated with a No.4 heat exchanger and is used for pumping cold water; the cold water is subjected to heat exchange through the No.2 heat exchanger and the high-temperature tail gas discharged from the positive electrode plate; after the cold water passes through a three-way valve, the cold water is divided into two paths to be controlled according to high and low temperatures of cooling liquid, measured by a thermocouple temperature measuring device; and a cooling liquid circulating loop is communicated with a cooling water circulating loop through a No.3 heat exchanger. A cooling circulating unit provided by the invention is simple in structure and simple in design; and a lot of parts are omitted, so that the size of the cogeneration device is greatly reduced and the cost is reduced at the same time.

Description

technical field [0001] The invention belongs to the technical fields of fuel cell cogeneration system and energy control, and in particular relates to a thermal control system of a fixed miniature fuel cell cogeneration device. Background technique [0002] The fuel cell cogeneration device uses hydrocarbon fuel (natural gas, biogas, etc.) to convert the hydrogen-rich reformed mixed gas through the fuel reforming unit, and supplies the reformed mixed gas and air to the anode and cathode of the fuel cell stack respectively. , and then generate direct current through electrochemical reaction, and recover the heat in the reforming reaction process and the heat generated in the power production process. [0003] In a fuel cell cogeneration unit, the hydrogen-rich mixed gas stream obtained from the reformer unit is usually at a temperature of 150°C or higher, and must be cooled to between the liquefaction point and 80°C before entering the anode of the fuel cell, or it must be co...

AI Technical Summary

Problems solved by technology

When the fuel cell stack is in cold start, it needs to heat the stack through the heat generated by its own work. This process takes a lot of time, so the output power of the fuel cell stack is limited during the start-up time

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