System and method for controlling one or more process parameters associated with a combustion process

Patent metadata

Field	Value
Publication number	US-10018356-B2
Application number	US-201313837221-A
Country	US
Kind code	B2
Filing date	Mar 15, 2013
Priority date	Jul 12, 2012
Publication date	Jul 10, 2018
Grant date	Jul 10, 2018

Abstract

The present invention relates generally to the generation of steam via the use of a combustion process to produce heat and, in one embodiment, to a device, system and/or method that enables one to control one or more process parameters of a combustion process so as to yield at least one desirable change in at least one downstream parameter. In one embodiment, the present invention is directed to a system and/or method for controlling at least one process parameter of a combustion process so as to yield at least one desirable change in at least one downstream process parameter associated with one or more of a wet flue gas desulfurization (WFGD) unit, a particulate collection device and/or control of additives thereto and/or a nitrogen oxide control device and/or control of additives thereto and/or additives to the system.

First claim

What is claimed is:

1. A method for optimizing a wet flue gas desulfurization unit, the method comprising the steps of:
(I) measuring, analyzing and/or controlling at least one parameter selected from the chemistry in the flue gas and/or absorber tank of the WFGD;
(II) generating data from the at least one parameter of Step (I); and
(III) using the data generated in Step (II) to adjust at least one operational parameter selected from at least one reagent feed flow to the wet flue gas desulfurization unit,
wherein Step (III) comprises a method for controlling the oxidation-reduction potential in a recirculation tank, or an absorber recirculation tank, of a wet flue gas desulfurization unit, the method comprising the steps of:
(A) supplying an aqueous solution of at least one reducing agent to a slurry, or a solution, portion of the recirculation tank, or the absorber recirculation tank, or at least one recirculation pump so that the at least one reducing agent is supplied to the wet flue gas desulfurization unit recirculation tank or absorber recirculation tank; and
(B) permitting the at least one reducing agent to react with one or more oxidizing compounds and/or ions present in the slurry, or the solution, portion of the recirculation tank, or the absorber recirculation tank or the at least one recirculation pump, so as to achieve a reduction in the oxidation-reduction potential of the slurry, or the solution, in the recirculation tank, or the absorber recirculation tank, or in the at least one recirculation pump, or in a combination of the recirculation tank, or the absorber recirculation tank, and the at least one recirculation pump so that an amount of at least one insoluble precipitate compound in the recirculation tank, or the absorber recirculation tank, is controlled, prevented, or eliminated by the addition of the at least one reducing agent,

wherein the at least one reducing agent is selected from phosphorous acid (H 3 PO 3 ), iron (II) ammonium sulfate ((NH 4 ) 2 Fe(SO 4 ) 2 ), hydroxylamine hydrochloride (HONH 2 .HCl), hypophosphorous acid (H 3 PO 2 ), or a combination of any two or more thereof.

2. A method for optimizing a wet flue gas desulfurization unit, the method comprising the steps of:
(i) measuring, analyzing and/or controlling at least one parameter in real time selected from the chemistry in the flue gas and/or absorber tank of the WFGD;
(ii) generating real-time data from the at least one parameter of Step (i); and
(iii) using the real-time data generated in Step (ii) to adjust at least one operational parameter selected from at least one reagent feed flow to the wet flue gas desulfurization unit,
wherein Step (iii) comprises a method for controlling the oxidation-reduction potential in a recirculation tank, or an absorber recirculation tank, of a wet flue gas desulfurization unit, the method comprising the steps of:
(a) supplying an aqueous solution of at least one reducing agent to a slurry, or a solution, portion of the recirculation tank, or the absorber recirculation tank, or at least one recirculation pump so that the at least one reducing agent is supplied to the wet flue gas desulfurization unit recirculation tank or absorber recirculation tank; and
(b) permitting the at least one reducing agent to react with one or more oxidizing compounds and/or ions present in the slurry, or the solution, portion of the recirculation tank, or the absorber recirculation tank or the at least one recirculation pump, so as to achieve a reduction in the oxidation-reduction potential of the slurry, or the solution, in the recirculation tank, or the absorber recirculation tank, or in the at least one recirculation pump, or in a combination of the recirculation tank, or the absorber recirculation tank, and the at least one recirculation pump so that an amount of at least one insoluble precipitate compound in the recirculation tank, or the absorber recirculation tank, is controlled, prevented, or eliminated by the addition of the at least one reducing agent,

wherein the at least one reducing agent is selected from phosphorous acid (H 3 PO 3 ), iron (II) ammonium sulfate ((NH 4 ) 2 Fe(SO 4 ) 2 ), hydroxylamine hydrochloride (HONH 2 .HCl), hypophosphorous acid (H 3 PO 2 ), or a combination of any two or more thereof.

3. A method for optimizing a wet flue gas desulfurization unit, the method comprising the steps of:
controlling, measuring and/or analyzing at least one process parameter of a combustion process and/or at least one combustion process air quality control system in order to yield at least one data set; and
using the at least one data set to effect a desirable change in at least one downstream process parameter associated with one or more of a wet flue gas desulfurization unit, a particulate collection device and/or a nitrogen oxide control device,
wherein the desirable change effected is accomplished by at least the measurement of an oxidation-reduction potential and using the at least one data set generated thereby to control the oxidation-reduction potential in a recirculation tank, or an absorber recirculation tank, of a wet flue gas desulfurization unit, the control method comprising the steps of:
supplying an aqueous solution of at least one reducing agent to a slurry, or a solution, portion of the recirculation tank, or the absorber recirculation tank, or at least one recirculation pump so that the at least one reducing agent is supplied to the wet flue gas desulfurization unit recirculation tank or absorber recirculation tank; and
permitting the at least one reducing agent to react with one or more oxidizing compounds and/or ions present in the slurry, or the solution, portion of the recirculation tank, or the absorber recirculation tank or the at least one recirculation pump, so as to achieve a reduction in the oxidation-reduction potential of the slurry, or the solution, in the recirculation tank, or the absorber recirculation tank, or in the at least one recirculation pump, or in a combination of the recirculation tank, or the absorber recirculation tank, and the at least one recirculation pump so that an amount of at least one insoluble precipitate compound in the recirculation tank, or the absorber recirculation tank, is controlled, prevented, or eliminated by the addition of the at least one reducing agent,

wherein the at least one reducing agent is selected from phosphorous acid (H 3 PO 3 ), iron (II) ammonium sulfate ((NH 4 ) 2 Fe(SO 4 ) 2 ), hydroxylamine hydrochloride (HONH 2 .HCl), hypophosphorous acid (H 3 PO 2 ), or a combination of any two or more thereof.

4. A method for optimizing a wet flue gas desulfurization unit, the method comprising the steps of:
controlling, measuring and/or analyzing at least two process parameters of a combustion process and/or at least one combustion process air quality control system in order to yield at least two data sets;
using the at least two data sets to effect a desirable change in at least one downstream process parameter associated with one or more of a wet flue gas desulfurization unit, a particulate collection device and/or a nitrogen oxide control device,
wherein the desirable change effected is accomplished by at least the measurement of an oxidation-reduction potential and at least the concentration of at least one concentration of one or more oxidizer compounds and/or species using the at least two data sets generated thereby to control the oxidation-reduction potential in a recirculation tank, or an absorber recirculation tank, of a wet flue gas desulfurization unit, the control method comprising the steps of:
supplying an aqueous solution of at least one reducing agent to a slurry, or a solution, portion of the recirculation tank, or the absorber recirculation tank, or at least one recirculation pump so that the at least one reducing agent

Assignees

• Babcock & Wilcox Power Generat
• Babcock & Wilcox Co

Inventors

• Johnson Daniel B
• Brown Shannon R

Classifications

• G01N31/005

  investigating the presence of an element by oxidation (G01N31/12 takes precedence) · CPC title

• G01N1/22

  in the gaseous state {(specially adapted for biological material G01N33/497; measuring breath flow A61B5/087)} · CPC title

• G01N33/1846

  Total carbon analysis · CPC title

• G01N31/12

  using combustion (G01N25/20 takes precedence) · CPC title

• F23J15/02 Primary

  of purifiers, e.g. for removing noxious material (traps for solid residues F23J3/04) · CPC title