A direct carbon fuel cell with cathode air intake feedback control and its control method

Abstract

The invention discloses a direct carbon fuel cell capable of realizing cathode air intake feedback control, and a control method for the direct carbon fuel cell. The direct carbon fuel cell comprises a reaction apparatus, an anode plate cabin, a cathode plate cabin, an anode, a cathode, an anode collector plate, a cathode collector plate, a micropore partition plate, electrolyte and carbon fuel; through adding an electronic control unit, a gas-saving sheet, an air circulating apparatus, an electromagnetic valve and other systems with controllable flow in the direct carbon fuel cell, the flow control of cathode air intake is well realized, the reaction speed and conductivity of the cathode are improved, and the stability in current density output is realized; the electronic control unit sets current density reference values of fusion alkali solution electrolyte at different temperatures, the multi-grade regulation of the gas-saving sheet is realized, so that the air intake flow can be well controlled, and stable control of flow is realized; and a mixed gas of oxygen including no less than 35 % of vapor based on concentration, or a mixed gas of air including no less than 35 % of vapor based on concentration is adopted for the cathode air intake, so that the hydroxyl consumption in the electrolyte can be effectively avoided.

Description

technical field [0001] The invention relates to the field of preparation of direct carbon fuel cells, in particular to a direct carbon fuel cell and a control method thereof with cathode air intake feedback controllable. Background technique [0002] Fuel cells (fuel cells, FCs) are the fourth-generation power generation technology after thermal power, hydropower and nuclear power. It is considered to be the most promising efficient and clean power generation technology in the 21st century. As a kind of fuel cell, direct carbon fuel cell DCFC can use graphite, activated carbon, coal coke, biomass coke, etc. as fuel. Carbon (carbon derivatives) and oxygen undergo electrochemical reactions to generate electricity directly without gasification. It has the characteristics of high energy conversion efficiency, cleanliness and wide fuel adaptability. The operating temperature of direct carbon fuel cells is between 400 and 1000°C. [0003] Direct carbon fuel cells use carbon as ...

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Problems solved by technology

And tested this type of battery with different scales, the output power density of small devices is very low, less than 2mW / cm2 2

The invention is based on the solid oxide carbon fuel cell, and the design of the fluidized bed electrode is carried out. The air intake control is limited to the anode, and the mixed gas cannot be dynamically controlled.

[0008] The above-mentioned documents mentioned different fluidized bed electrode carbon fuel cell devices, each with its own defects. The main problem is that the change of the oxygen flow rate in the cathode intake air will directly affect the relevant performance of the battery.

Pang Yongmei et al. pointed out in the research on the performance of direct carbon fuel cells: high oxygen flow can increase the reaction speed of the cathode, but when the flow is too large, it will accelerate the oxidation and corrosion of the cathode, which is not conducive to the reduction of oxygen. Therefore, at a specific temperature, the flow of oxygen in Within a certain range, the performance of the battery can be optimal

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