Patent
Method for flue gas conditioning with the decomposition products of ammonium sulfate or ammonium bisulfate
TLDR
In this paper, a method for enhancing the efficiency of fly ash collection in an electrostatic precipitator by lowering the resistivity of the fly ash particles in the flue gas is presented.Abstract:
A method is provided for enhancing the efficiency of fly ash collection in an electrostatic precipitator by lowering the resistivity of the fly ash particles in the flue gas, comprising the steps of introducing an aqueous solution of ammonium sulfate or ammonium bisulfate into a slipstream of hot gas in a chamber external to the main flue gas duct wherein thermal decomposition is effected and distributing the decomposition products into the main flue gas stream exiting from the air preheater at a point upstream from the electrostatic precipitator.read more
Citations
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Patent
Methods for the production of ammonia from urea and/or biuret, and uses for NOx and/or particulate matter removal
TL;DR: In this article, the authors describe a method for generating ammonia from urea based on the hydrolysis of an aqueous solution of urea and/or biuret by heating under pressure.
Patent
Flue gas conditioning system
TL;DR: Improved apparatus and methods for the treatment of boiler flue gas with sulfur trioxide conditioning agent include the beneficial use of catalytic converters that can be located immediately adjacent the injection site for their sulfur dioxide output, that can also be individually controlled and can provide substantially improved conversion efficiency and that can provide an efficient, flexible, effective and relatively inexpensive multi-boiler flue conditioning system as discussed by the authors.
Patent
Selective catalytic reduction of NOx enabled by sidestream urea decomposition
TL;DR: In this article, the enthalpy of the flue gas was used to convert urea into ammonia for SCR, and a cyclonic separator can be used to remove particulates and completely mix the reagent and flue gases.
Patent
Processes and apparatus for quantitatively converting urea to ammonia on demand
TL;DR: In this article, the authors describe a process for quantitatively converting urea to ammonia on demand, which includes the following steps: receiving a demand rate signal for ammonia, feeding reactants including urea and water into a reactor to provide a reaction mixture; and controlling temperature and pressure in the reactor to produce a gaseous product stream including ammonia and carbon dioxide at substantially constant concentrations.
Patent
Control of addition of conditioning agents to flue gas
TL;DR: In this article, the addition of conditioning agents to a particulate-containing flue gas stream is controlled by a controller operating from feedforward and feedback signals received from sensors in the combustion and gas cleanup system, and, optionally, from the power consumption level of the electrostatic precipitator.
References
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Patent
Method and apparatus for conditioning flue gas with a mist of H{HD 2{B SO{HD 4
TL;DR: In this paper, a very fine mist of H2SO4 condensed and adsorbed on the particles themselves was used to reduce the electrical resistance of entrained fine particles of fly ash resulting from the burning of low sulfur coal.
Patent
Method and apparatus for conditioning flue gas with a mist of H2 SO4
TL;DR: In this article, a very fine mist of H 2 SO 4 condensed and adsorbed on the particles themselves was used to reduce the electrical resistance of entrained fine particles of fly ash resulting from the burning of low sulfur coal.
Patent
Method of and apparatus for chemically conditioning a particle-laden gas stream
TL;DR: In this paper, a method of and apparatus for chemically conditioning a particle-laden gas stream to improve the collection characteristics of the entrained particles comprising the injection of a conditioner solution, preferably ammonium sulfate ((NH4)2 SO4), into the gas stream before the stream enters an electrostatic precipitator.
Patent
Method of conditioning flue gas to electrostatic precipitator
TL;DR: In this paper, ammonium bisulfate is injected into a particle-laden gas stream formed by the burning of coal while the gas has a temperature of 590-900° C. After injection, the stream is directed through a heat exchange means and finally into the precipitator to collect the particles therein.
Journal ArticleDOI
A comparison of chemical additives as aids to the electrostatic precipitation of fly-ash
J. Dalmon,D. Tidy +1 more
TL;DR: In this article, it is suggested that changes in resistivity due to an additive affected the electron charge on the ash layer, which in turn influenced the surface work function and raised the flashover voltage.