Coal-water slurry gasification and coal-fired boiler ultra-low NOx emission integrated collaborative control method

Abstract

An integrated collaborative control method for coal-water slurry gasification and coal-fired boiler ultra-low NOx emissions, using a dual-input-double-output control model to combine the control of the front-end equipment coal-water slurry pyrolysis gasifier with the back-end equipment coal-fired boiler The reduction of NOx emissions under different loads and the control of syngas demand are considered as an overall system, which can realize the integrated and coordinated control of multiple equipment in the same group. In the present invention, the pressure signal at the outlet of the coal-water slurry gasifier is used as the control signal for whether the pyrolysis synthesis gas production of the front-end equipment is balanced with the demand for the synthesis gas of the back-end equipment, and the relationship curve function between the operation load of the back-end equipment and the coal slurry flow rate of the front-end equipment As a feed-forward signal, the multiple control quantities (synthesis gas production and demand, boiler load and gas production, etc.) of the two equipment (coal-water slurry gasifier and coal-fired boiler) are matched together. Form an integrated collaborative control method.

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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