Scrubbing stack gas

Typical air pollution control equipment employed by the industry include the following stack gas scrubbing and/or carbon adsorption (for toxic organics) and... 

The principal air pollutants from dye manufacturing are VOCs, nitrogen oxides (NOJ, hydrogen chloride (HCl), and sulfur oxides (SOJ. Stack gas scrubbing and/or... 

Other applications of microparticles include spray drying, stack gas scrubbing, particle and droplet combustion, catalytic conversion of gases, fog formation, and nucleation. The removal of SO2 formed in the combustion of high-sulfur coal can be accomplished by adding limestone to coal in a fluidized bed combustor. The formation of CaO leads to the reaction... 

In the production of ammonia-based sulfite pulp, the amount of ammonia used per ton of pulp varies from mill to mill. The industry average is about 125 pounds (56.7 kilograms) of ammonia per ton of sulfite pulp. This industry also uses ammonia for stack gas scrubbing and wastewater treatment57. 

These coal liquids originally were intended to serve as boiler fuels. The sulfur content may be sufficiently low to qaulify them as replacement for high-sulfur coal, and bring sulfur dioxide emissions within acceptable limits. However, for large boilers, such as major base load power plants, pollution control via coal hydroliquefaction probably is not competitive with stack gas scrubbing (I). 

In other fuel markets, coal liquids can be more competitive. Industrial boilers presently are not amenable to stack gas scrubbing. The same is true of smaller utility plants. In particular, peak load units require a clean, storable liquid fuel as an alternative to natural gas. However, the high viscosity of primary coal liquefaction products is undesirable for many of these applications. Also, their residual sulfur and nitrogen contents may be excessive as emission standards become more stringent. 

The hybrid metal phthalocyanine complexes may find application for specific pollution control processes such as S02 stack-gas scrubbing, post-Klaus plant scrubbing of H2S and S02, sweetening of sour oil-refinery wastes, odor and corrosion control in wastewater facilities, and the elimination of excess rocket fuel wastes. 

The majority of the stack gas scrubbing processes are designed to remove sulfur dioxide from the gas streams some processes show the potential for the removal of NOx. However, there is the current line of thinking that pursues the options that enable SOx and NOx to be controlled, at least as far as possible, by modification of the combustion process. Sulfur (as already noted) can be removed by injecting limestone, with the coal into a boiler while modifications of the combustion chamber, as well as methods of flame temperature regulation and techniques that lower combustion temperatures, such as injection of steam into the combustion region are claimed to reduce emissions of NOx. 

Most stack gas scrubbing processes are designed for sulfur dioxide removal nitrogen oxides are controlled as far as possible by modification of combustion design and flame temperature regulation. However, processes for the removal of sulfur dioxide usually do remove some nitrogen oxides particulate matter can be removed efficiently by commercially well-established electrostatic... 

There are several processes for the removal of sulfur dioxide from stack gas (Table 25.1) (Chapter 23) but to date scrubbing process utilizing limestone (CaCOj) or lime [Ca(OH)J slurries have received more attention than other stack gas scrubbing processes. Attempts have been made to use dry limestone or dolomite (CaCOs MgCOj) within the combustor as an in situ method for sulfur dioxide removal, thus eliminating the wet sludge from wet processes. This involves injection of dry carbonate mineral with the coal followed by recovery of the calcined product along with sulfite and sulfate salts. 

Figure 11.8 shows a simplified flow diagram for production of sulfuric acid from pyrites. The diagram shows a single-contact, single-absorption process. In most locations either stack gas scrubbing or a second contact-... 

Flue-Gas (Stack-Gas) Scrubbing. Flue-gas scrubbing is a refiner s last chance to keep NOx and SOx out of the air. In wet flue-gas desulfurization, gas streams containing SOx react with an aqueous slurry containing calcium hydroxide Ca(OH)2 and calcium carbonate CaCOs. Reaction products include calcium sulfite (CaSOs) and calcium sulfate (CaS04>, which precipitate from the solution. 

Spirits of wine - 784, 836 Stackfas mastic - 210 Stack gases -711 Stack gas scrubbing - 210 Stainless steel pickle - 210 Standard Oil Mobilube - 365 Stanisol - 235... 

Many processes have been proposed or studied for the removal of sulfur dioxide from stack gas. Table 15.2 summarizes major stack gas scrubbing systems. These include throwaway and recovery systems as well as wet and dry systems. 

Sulfur dioxide trapped in a stack-gas-scrubbing process can be converted to hydrogen sulfide by reaction with synthesis gas (H2, CO, CH4),... 

Uses Solvent brake fluid component solvent for removing CO, COj, SOj, HjS and other sour-gas components from ammonia gas streams, for absorp. of fluorocarbons and other halogenated liqs./gases stack gas scrubbing solubilizer for plastics, textiles, and paper Regulatory Canada DSL PEG-3 dimethyl ether CAS 112-49-2 24991-55-7 (generic)... 

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