Integrated cooperative control method for coal water slurry gasification and ultra-low NOx emission of coal-fired boiler

Abstract

Disclosed is an integrated cooperative control method for coal water slurry gasification and ultra-low NOx emission of a coal-fired boiler. A double-input and double-output control model is adopted, the control of a front-end equipment coal water slurry pyrolysis gasification furnace and the control on the synthesis gas demand quantity for reducing NOx emission of a rear-end equipment coal-fired boiler under different loads are considered as a whole system, and integrated cooperative control of multiple pieces of equipment in the same group can be realized. An outlet pressure signal of a coal water slurry gasification furnace is used as a control signal for judging whether the pyrolysis synthesis gas production rate of front-end equipment and the synthesis gas demand quantity of rear-end equipment are balanced or not, and a relation curve function of the operation load of the rear-end equipment and the coal slurry flow rate of the front-end equipment is used as a feed-forward signal, therefore, whether a plurality of control quantities (synthesis gas production and demand quantity, boiler load and gas production and the like) of the two pieces of equipment (the coal water slurry gasification furnace and the coal-fired boiler) are matched or not is associated, and the integrated cooperative control method is formed.

Description

technical field [0001] The present invention relates to a technology in the field of thermal power generation, specifically a coal-water slurry gasification pretreatment and coal-fired boiler ultra-low NOx emission integrated collaborative control method, which can achieve a nitrogen oxide emission concentration of no higher than 50mg / N m 3 ultra-low emission standards. Background technique [0002] On the basis of the current national standard GB13223-2011 on the emission of air pollutants from thermal power plants, in order to further control the pollutant emissions of the coal power industry, the Ministry of Environmental Protection, the National Development and Reform Commission and the National Energy Administration jointly issued the "Coal Power Energy Conservation and Emission Reduction Upgrading and Transformation Action Plan" (2014-2020), the document strictly controls the emission of air pollutants, and puts forward stricter requirements for ultra-low emissions i...

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Problems solved by technology

[0004] The present invention aims at the deficiency that the control of the coal-water slurry gasification furnace and the ultra-low emission control of the coal-fired boiler can be linked to form an integrated cooperative control in the prior art, and proposes an integration of the coal-water slurry gasification and the ultra-low NOx emission of the coal-fired boiler The coordinated control method adopts a dual-input-double-output control model, and multiple control quantities (synthesis gas production and demand, boiler load and gas production) of two equipment (coal-water slurry gasifier and coal-fired boiler) Whether they match and link together to form an integrated collaborative control method

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