A Method for Storage and Compensation of Molten Carbonate Fuel Cell Electrolyte

Abstract

The invention relates to a molten carbonate fuel cell electrolyte storage and compensation method. The method comprises the following steps: 1. preparing an electrode and a diaphragm as required, wherein the porosity of the electrode is 60-80% and the porosity of the diaphragm is 50-60%; 2. calculating the masses of Li2CO3 and K2CO3 molten salt electrolytes with molar ratio of 62 to 38 in a pore, required by the prepared electrode and the diaphragm after completely roasting; 3. fully and uniformly mixing the molten salt electrolytes after mass calculation, drying, and uniformly spreading the molten salt electrolytes on the electrode and the diaphragm respectively; 4. putting the electrode and the diaphragm with the molten salt electrolytes into a muffle furnace for roasting for 10-20h at 480-540 DEG C, storing the electrolytes required by the molten carbonate fuel cell in the electrode and the diaphragm, wherein the electrolytes stored in the electrode can compensate the diaphragm during cell running, so that the cell can run stably. The method is easy to operate and has the important significance on electrolyte storage and compensation of the improved molten carbonate fuel cell.

Description

technical field [0001] The invention relates to the technical field of molten carbonate fuel cells, in particular to a storage and compensation method for molten carbonate fuel cell electrolytes. Background technique [0002] A fuel cell is a power generation device that directly converts the chemical energy of fuel into electrical energy by electrochemical reaction without combustion. Its biggest feature is that the reaction process does not involve combustion, so the energy conversion efficiency is not limited by the "Carnot cycle". , The efficiency is as high as 50% to 60%. Molten carbonate fuel cell (MCFC) is a high-temperature fuel cell developed in the late 1950s, with an operating temperature of around 650 °C. Compared with low-temperature fuel cells, high-temperature fuel cells have obvious advantages: (1) Fossil fuels can be used, the fuel reforming temperature is higher, thermal coupling can be achieved with higher-temperature batteries, and even fuel can be direc...

AI Technical Summary

Problems solved by technology

After reviewing a large amount of literature, there are currently three main storage schemes for MCFC electrolytes: 1. Store the electrolyte in the gas flow channel of the battery, so that during the heating process of the battery, the electrolyte melts and immerses into the separator by capillary force. The method is relatively easy to implement, but the corrosion of the battery flow channel by the molten salt is relatively serious, and due to the influence of the air flow, the molten salt is prone to unevenness in the process of immersing the diaphragm; 2. Make the electrolyte similar to the salt of the diaphragm Membranes are stacked together in the form of sandwiches when assembling batteries. This scheme is also feasible for single cells or a small number of battery stacks, but when the battery stack is large, due to the thickness of the salt film. The battery stack will undergo large settlement, and the diaphragm will be easily cracked, which will affect the operation of the battery stack; 3. Mix the electrolyte and the diaphragm powder together to prepare an integrated substrate. This solution is difficult to control the porosity of the diaphragm. and hole distribution