Process and system for combining waste electricity hydrogen production with circulating fluidized bed boiler combustion

Abstract

The invention discloses a process and a system for combining waste electricity hydrogen production with circulating fluidized bed boiler combustion. During deep peak regulation, a part of flue gas is used as circulating flue gas, a part of circulating flue gas is mixed with air or oxygen to obtain primary air, the primary air is used as fluidizing air to enter a hearth from the lower part of the hearth, the other part of circulating flue gas is mixed with oxygen to obtain secondary air, and the secondary air is fed into the hearth from the upper part of the hearth; the oxygen content in the primary air is lower than that in the air, and the oxygen content in the secondary air is higher than that in the air; the oxygen for mixing comes from a water electrolysis hydrogen production process; and in the water electrolysis hydrogen production process, waste electricity is adopted for water electrolysis hydrogen production. By means of the process and system, the problems that in-furnace fluidization safety is poor when the circulating fluidized bed unit is subjected to deep peak regulation, the original generation amount of in-furnace nitric oxide is increased, and the concentration of carbon dioxide in flue gas is low can be effectively solved, and therefore the deep peak regulation capacity of the circulating fluidized bed boiler generator unit is improved.

Description

technical field [0001] The invention relates to a process and system for producing hydrogen from waste electricity combined with circulating fluidized bed boiler combustion. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Hydrogen energy has been widely used as a promising clean energy. Hydrogen production by electrolysis of water can produce extremely high-purity hydrogen. However, the cost of electricity consumption accounts for as high as 70-80% of the cost of hydrogen production. to a decisive role. Based on the above reasons, the use of waste electricity generated by renewable energy for hydrogen production by electrolysis of water has become a low-cost option for h...

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Problems solved by technology

Circulating fluidized bed boilers are different from conventional pulverized coal boilers. Since the materials in circulating fluidized bed boilers stay in the furnace for a long time, the combustion inertia in the circulating fluidized bed furnace and the thermal inertia of the bed materials are relatively large, resulting in the circulation flow The fluidized bed boiler generator set has the characteristics of large thermal inertia. It is difficult to change the boiler load quickly by changing the amount of fuel added. Therefore, both the load reduction rate and the load increase rate of the circulating fluidized bed boiler are affected by thermal inertia, which limits the efficiency of the circulating fluidized bed boiler. Deep Peak Shaving Performance of Boiler

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