Low energy consumption method and device for rotational flow evaporation of liquid ammonia in power plants

Abstract

The invention belongs to the technical field of ammonia evaporation in coal-fired power plants, and particularly relates to a method and device for rotational flow evaporation of liquid ammonia in power plants. The device comprises a stirring heat exchanging kettle, a static mixer, a rotational flow evaporation device and a dilute ammonia water collection tank, wherein the stirring heat exchanging kettle is used for uniformly stirring the liquid ammonia and dilution water and taking away heat; the static mixer is connected to a dilution stirring kettle and is used for mixing ammonia water flowing out of the stirring heat exchanging kettle and a dilute ammonia-water solution obtained after rotational flow evaporation; the rotational flow evaporation is connected to the static mixer and is used for evaporating dilute ammonia water to form ammonia gas under the carrying effect of flue gas and carrying out gas-liquid separation; the dilute ammonia water collection tank is used for collecting dilute ammonia water flowing out of the bottom of the rotational flow evaporation device; and the dilute ammonia water is conveyed to the static mixer by a centrifugal pump and is mixed with high concentration ammonia liquid. The flue gas with the temperature is used as a dispersion phase and causes the liquid ammonia to be evaporated in the rotational flow evaporation device, so that the energy consumption of ammonia evaporation is greatly reduced; meanwhile, the flue gas is used as a dilution component, thereby reducing potential explosion hazards in an ammonia evaporation process.

Description

technical field [0001] The invention belongs to the technical field of ammonia vaporization in coal-fired power plants, and relates to a method and device for vaporizing liquid ammonia using a swirl vaporizer with low energy consumption, and is suitable for a denitrification system using ammonia as a reducing agent. Specifically, the invention provides a method and device for swirl vaporizing liquid ammonia with low energy consumption in a power plant. Background technique [0002] At present, the mainstream technologies of coal-fired flue gas denitrification devices in power plants include SCR (Selective Catalytic Reduction) technology, SNCR (Selective Non-Catalytic Reduction) technology and the coupling of the two technologies. SCR technology refers to the reduction of NO in the flue gas under the action of a catalyst within the temperature window of 320°C-420°C. x Selectively react with reducing agent to generate nitrogen and water to remove NO x denitrification technol...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to solve the technical problems of high energy consumption and low safety factor of the existing coal-fired power plant ammonia vaporization system, and to provide a method and device for swirling vaporization of liquid ammonia with low energy consumption

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