Brian J Grandjean

US Patent:

20110125326, May 26, 2011

Filed:

Jul 28, 2009

Appl. No.:

13/055642

Inventors:

Roberto Bosco - Rochester NH, US
Brian Grandjean - Amesbury MA, US

Assignee:

POWERSPAN CORP. - PORTSMOUTH NH

International Classification:

C12Q 3/00
G01J 3/44

US Classification:

700271, 700266

Abstract:

An apparatus and method of controlling carbonate/bicarbonate concentrations and ratio in a chemical process having the steps of flowing a carbonate/bicarbonate solution through a measurement cell (), exposing the solution to laser light of suitable wavelength and power (); measuring the intensity of the scattered light using Raman spectroscopy (); calculating the concentration of carbonate and bicarbonate from the intensity of the scattered light (); and sending the measurement results to a programmable logic controller () to be used to control the ratio of carbonate and bicarbonate in the solution through adjusting process parameters. The method is useful in both carbon dioxide absorption processes and carbonate/bicarbonate regeneration processes.

US Patent:

20110052453, Mar 3, 2011

Filed:

Oct 31, 2008

Appl. No.:

12/863250

Inventors:

Christopher McLarnon - Exeter NH, US
Joanna Duncan - Spingvale ME, US
Francis Alix - Rye NH, US
Aytac Sezgi - Bedford NH, US
Wade Amos - Gloucester MA, US
Roberto Bosco - Rochester NH, US
Brian Grandjean - Amesbury MA, US
Michelle Livingston - Wolfeboro NH, US

International Classification:

B01D 53/14
B03C 3/16
G01J 3/44

US Classification:

422170, 96242, 96 52, 95183, 95 42, 356301

Abstract:

A method and apparatus for removing carbon dioxide and other pollutants from a gas stream having components that work synergistically. The invention includes an ammonia based scrubbing solution for SO2 scrubbing; an SO2 absorption section () to create contact between the flue gas and the ammonia based scrubbing solution to remove SO2 from the flue gas; a wet electrostatic precipitator to remove aerosols and fine particulate matter from the flue gas; a regenerable carbonate scrubbing solution for CO2 scrubbing, a CO2 absorption section () for removal of CO2 adapted to create contact between the flue gas and the scrubbing solution and which operates at a temperature between 32 and 66 degrees C. and including mass transfer apparatus and liquid distribution apparatus to provide the gas and liquid contact; an ammonia absorption section () to capture ammonia vapor which creates contact between at least some of the liquid leaving the SO2 absorption section and the gas leaving the CO2 absorption section and return ammonia rich liquid leaving the CO2 absorption section to the SO2 absorption section for use in SO2 capture; a regeneration tower () to release CO2 from the scrubbing solution, the regeneration tower comprising: packing for mass transfer; apparatus for allowing the spent scrubbing solution to be introduced at elevated temperature; and apparatus for introducing heat to the regenerator tower, a controller for controlling the absorption and regeneration system parameters selected from the group consisting of gas inlet temperature, reagent feed rates, regeneration temperature and pressure, and system differential pressure; and a heat recovery device to recover energy during the heating and cooling of the absorption and regeneration column liquids.