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The invention discloses an electrolytic hydrogen production process during production of polysilicon. The electrolytic hydrogen production process during the production of the polysilicon comprises the following steps of: electrolyzing alkaline solution to obtain coarse hydrogen and oxygen; allowing the coarse hydrogen to pass through a purification device; deoxidizing, dehydrating and drying thecoarse hydrogen to obtain pure hydrogen with purity of higher than 99.999 percent and oxygen at the concentration of higher than 99 percent; recovering and diluting the oxygen at the concentration ofhigher than 99 percent to obtain oxygen-enriched air with the oxygen content of 21 to 25 percent; and feeding the oxygen-enriched air into combustion equipment to perform oxygen-enriched combustion. According to the electrolytic hydrogen production process during the production of the polysilicon of the embodiment of the invention, the byproduct, namely the high-purity oxygen during electrolytic hydrogen production is recycled and not directly discharged, so energy is saved, energy consumption is reduced, and manufacturing cost of the oxygen applied to oxygen-enriched combustion is saved. Theinvention also discloses an oxygen recovery system applied to the electrolytic hydrogen production process during the production of the polysilicon.

The invention relates to a method of implementing high pressure fluidization blast using steam in place of air, characterized in that: steam is used for high pressure fluidization blast in normal running of a boiler. The method includes: connecting a turbine exhaust or intermediate extraction with a stock recycler using a steam conduit; starting high pressure fluidization blower and fluidizing recycle material in the stock recycler using air when the boiler begins to start; opening stop valve of the turbine steam conduit, fluidizing recycle material in the stock recycler using steam, shutting down the high pressure fluidization blower and closing the stop valve when the temperature of recycle material in the stock recycler is above 300 Celsius degree, the fluidization steam vapor source pressure parameter is greater than 60Kpa, and the superheat degree is larger than 30 Celsius degree; starting the high pressure fluidization blower, fluidizing recycle material in the stock recycler using air, and closing the stop valve on steam turbine when the temperature of the stock recycler is under 300 Celsius degree in blow off process of the boiler. Advantages of the invention consist in that coking of the stock recycler or other high temperature zones can be prevented or abated and boiler operation reliability can be improved by using steam for replacing high pressure fluidization blast. At the same time, circulating fluid bed boiler desulfurizer utilization rate can be improved, Nox discharge concentration can be reduced, and power plant running cost can be saved by utilizing steam fluidization.