System and method for producing pure hydrogen and oxygen by adopting electrolysis brine

Abstract

The invention relates to a system and method for producing pure hydrogen and oxygen by adopting electrolysis brine. The system comprises a water storage device, a water inlet valve, a water inlet pump, an electrolytic cell, the anode, the cathode, a pulsed power supply, a first valve, a first vacuum pump, a second valve, a second vacuum pump, a hydrogen collecting device and an oxygen collecting device. The method is characterized in that an operation mode of supplying power by adopting the pulsed power supply is adopted; when the pulsed power supply is turned on, only oxygen is generated and hydrogen ions accumulate at the liquid phase; after the pulsed power supply is turned off, only hydrogen is generated; the two gases: namely hydrogen and oxygen are collected and enter the gas collecting devices separately through the control of the valves and the vacuum pumps; and the turn on / off operation is carried out continuously, so that a lot of pure hydrogen and oxygen are prepared. Compared with the conventional water-electrolytic hydrogen making equipment and process, the system and method for producing pure hydrogen and oxygen by adopting electrolysis brine has the advantages as follows: the pulsed power supply method is adopted, the two gases: namely hydrogen and oxygen are separated and purified on the premise of not needing gas separation equipment, the loss of voltage of the conventional equipment due to membrane pollution and polarization is effectively reduced, and both the hydrogen production power consumption and equipment cost are greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of preparing pure hydrogen and oxygen by electrolyzing brine, and in particular relates to a system and method for preparing pure hydrogen and oxygen by electrolyzing brine. Background technique [0002] With the acceleration of industrialization, the consumption of energy is increasing day by day, and the consumption of fossil fuels as the main energy has brought serious environmental pollution and energy shortage problems. Hydrogen combustion is non-polluting and has a high calorific value. It is an environmentally friendly and clean energy with broad prospects for replacing fossil fuels. But because hydrogen is energy-dense and potentially explosive, only 4% of the world's commercial hydrogen is produced. Therefore, finding a safe, reliable, low-cost method to obtain pure hydrogen is an inevitable condition for the application of hydrogen energy. [0003] Water, as a kind of earth-abundant renewable ene...

AI Technical Summary

Problems solved by technology

In the traditional water electrolysis method, various devices are designed to avoid the mixing of hydrogen and oxygen produced, which increases the cost of installation and maintenance; at the same time, when the gas is generated, a large number of bubble disturbances will cause partial voltage loss

Alkaline electrolyzers are the most commonly used at present, but there are problems such as pollution, low efficiency, and high energy consumption costs.

Some new methods, such as SPE, use a special cation exchange membrane to migrate hydrogen ions, but the production of the membrane is more complicated and the cost is higher. In addition, the process of ion permeation through the membrane will also lose part of the voltage.

Images