Methods and systems for particulate matter removal from a process exhaust gas stream

Abstract

Disclosed herein are systems and methods for reducing the particulate matter content of an exhaust gas from a carbon black process.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of priority to U.S. patent application Ser. No. 15 / 752,331, filed Feb. 13, 2018, which is a U.S. National Stage application under 35 U.S.C. 371 of Patent Cooperation Treaty application PCT / EP2016 / 069057 filed Aug. 10, 2016, which in turn claims the benefit of priority to U.S. Provisional Application No. 62 / 205,146, filed Aug. 14, 2015. Each of these applications is incorporated by reference in its entirety herein,BACKGROUND OF INVENTION[0002]Sulfur oxides (e.g., SO2) are present in the waste gases discharged from many metal refining and chemical plants and in the flue gases (e.g., exhaust gases) from power plants generating electricity by the combustion of fossil fuels. The control of air pollution resulting from the discharge of sulfur oxides into the atmosphere has become increasingly urgent. An additional incentive for the removal of sulfur oxides from exhaust gases is the recovery of sulfur values o...

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Benefits of technology

[0013]In accordance with the purposes of the disclosed methods and systems, as embodied and broadly described herein, the disclosed subject matter relates to methods and systems for reducing particulate matter from a process exhaust gas, in particul

Problems solved by technology

However, the large volumes of these exhaust gases relative to the quantity of sulfur which they contain can make removal or recovery of sulfur compounds from these gases expensive.

Also, while the possible by-products that may be ultimately obtained from the recoverable sulfur, such as elemental sulfur and sulfuric acid, have virtually unlimited markets as basic raw materials, they sell for relatively low figures.

In general, a reaction between a solid and gas is relatively slow and has inefficient reaction kinetics, being limited by the available surface area of the solid.

Also, certain of the resultant products do not readily lend themselves to regeneration of the starting materials (meaning the absorber material has to be replaced after its surface has been saturated) or recovery of any removed sulfur values.

Wet absorption processes (e.g., wet scrubbers) suffer from the common drawback of the exhaust gas being cooled substantially and becoming saturated with water.

This cooling of the exhaust gas can decrease overall efficiency of the process because of the additional power requirements for dispersal of the exhaust gas to the atmosphere.

Further, the associated condensation and precipitation of evaporated water containing contaminants in the surrounding environmen

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