US 2014/0196639 A1Published application

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

AssigneeBabcock & Wilcox Power Generation Group, Inc.

InventorsDaniel B. Johnson, Shannon R. Brown

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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.

Claims23

Dependent claims

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:
(a) the type and/or amount of fuel to be combusted in the combustion process;
(b) the oxidation air flow rate to the combustion process;
(c) the ammonia slip across the selective catalytic reduction unit;
(d) the nitrogen oxide output from a selective catalytic reduction unit;
(e) the particulate control and/or capture device;
(f) the mercury speciation in the flue gas and/or absorber tank;
(g) the selenium speciation in the flue gas and/or absorber tank;
(h) the chemistry in the flue gas and/or absorber tank of the WFGD;
(i) the oxidation reduction potential of the absorber tank of the WFGD;
(j) the amount of the suspended solids in the absorber tank of the wet flue gas desulfurization unit;
(k) the analysis of the limestone and/or lime utilized in the wet flue gas desulfurization unit;
(l) the amount of various reagents supplied to the wet flue gas desulfurization unit tower;
(m) the SO2 concentration at the flue gas inlet of the wet flue gas desulfurization unit;
(n) the inlet opacity of the wet flue gas desulfurization unit;
(o) the PI data from the wet flue gas desulfurization unit;
(p) the amount of dissolved solids in the wet flue gas desulfurization unit;
and/or
(q) the relative saturation of the gypsum crystals in the wet flue gas desulfurization unit;
(II) generating data from the at least one parameter of Step (I);
(III) using the data generated in Step (II) to adjust at least one operational parameter selected from:
(A) the operational wet flue gas desulfurization unit tower level;
(B) the reagent feed flow to the wet flue gas desulfurization unit;
(C) the oxidation air flow to the wet flue gas desulfurization unit;
(D) the rate of absorber bleed from the wet flue gas desulfurization unit;
(E) the liquid to gas ratio in the wet flue gas desulfurization unit tower;
(F) the number of operating absorber recycle pumps in the wet flue gas desulfurization unit;
(G) the dewatering operation parameters;
(H) the ammonia feed rate to the selective catalytic reduction unit;
(I) the gypsum purity;
(J) the gypsum-related scale formation in the wet flue gas desulfurization unit absorber tower;
(K) the parasitic power loss by the wet flue gas desulfurization unit equipment;
(L) the oxidation-reduction potential in the absorber recirculation tank;
(M) the wet flue gas desulfurization unit effluent stream waste water treatment parameters;
(N) the SO2 removal efficiency by the wet flue gas desulfurization unit;
(O) the relative saturation of the gypsum crystals in the slurry;
and/or
(P) the total dissolved solids in the wet flue gas desulfurization unit.

35 more elements

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:
(a) the type and/or amount of fuel to be combusted in the combustion process;
(b) the oxidation air flow rate to the combustion process;
(c) the ammonia slip across the selective catalytic reduction unit;
(d) the nitrogen oxide output from a selective catalytic reduction unit;
(e) the particulate control and/or capture device;
(f) the mercury speciation in the flue gas and/or absorber tank;
(g) the selenium speciation in the flue gas and/or absorber tank;
(h) the chemistry in the flue gas and/or absorber tank of the WFGD;
(i) the oxidation reduction potential of the absorber tank of the WFGD;
(j) the amount of the suspended solids in the absorber tank of the wet flue gas desulfurization unit;
(k) the analysis of the limestone and/or lime utilized in the wet flue gas desulfurization unit;
(l) the amount of various reagents supplied to the wet flue gas desulfurization unit tower;
(m) the SO2 concentration at the flue gas inlet of the wet flue gas desulfurization unit;
(n) the inlet opacity of the wet flue gas desulfurization unit;
(o) the PI data from the wet flue gas desulfurization unit;
(p) the amount of dissolved solids in the wet flue gas desulfurization unit;
and/or
(q) the relative saturation of the gypsum crystals in the wet flue gas desulfurization unit;
(ii) generating real-time data from the at least one parameter of Step (I);
(iii) using the real-time data generated in Step (ii) to adjust at least one operational parameter selected from:
(A) the operational wet flue gas desulfurization unit tower level;
(B) the reagent feed flow to the wet flue gas desulfurization unit;
(C) the oxidation air flow to the wet flue gas desulfurization unit;
(D) the rate of absorber bleed from the wet flue gas desulfurization unit;
(E) the liquid to gas ratio in the wet flue gas desulfurization unit tower;
(F) the number of operating absorber recycle pumps in the wet flue gas desulfurization unit;
(G) the dewatering operation parameters;
(H) the ammonia feed rate to the selective catalytic reduction unit;
(I) the gypsum purity;
(J) the gypsum-related scale formation in the wet flue gas desulfurization unit absorber tower;
(K) the parasitic power loss by the wet flue gas desulfurization unit equipment;
(L) the oxidation-reduction potential in the absorber recirculation tank;
(M) the wet flue gas desulfurization unit effluent stream waste water treatment parameters;
(N) the SO2 removal efficiency by the wet flue gas desulfurization unit;
(O) the relative saturation of the gypsum crystals in the slurry;
and/or
(P) the total dissolved solids in the wet flue gas desulfurization unit.

35 more elements

A method for optimizing a wet flue gas desulfurization unit, the method comprising the steps of:

measuring, analyzing and/or controlling at least one parameter selected from:
(i) desulfurization tower load;
(ii) oxidation air flow rate;
(iii) one or more boiler parameters;
(iv) one or more selective catalytic reduction unit parameters;
and/or
(v) one or more electrostatic precipitator parameters;
generating data from the at least one parameter of the previous Step;
and
using the data generated in the previous Step to adjust at least one operational parameter selected from:
(a) one or more gypsum production properties and/or parameters;
(b) the oxidation-reduction potential in the absorber recirculation tank;
(c) the pH of the absorber recirculation tank solution;
(d) the concentration, type and/or speciation of one or more compounds and/or ions in the absorber recirculation tank solution;
and/or
(e) the concentration, type and/or speciation of one or more oxidizer compounds and/or ions in the absorber recirculation tank solution and/or the wet flue gas desulfurization unit.

13 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/837,221Filed 15 Mar 2013
Priority: 14 Jan 2013
Published: 17 Jul 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification21 codes

F23J 15/02
Arrangements of devices for treating smoke or fumes: of purifiers, e.g. for removing noxious material
B01D 53/346
Chemical or biological purification of waste gases: controlling the process
B01D 53/504
By treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound: characterised by a specific device
B03C 3/013
Pretreatment of the gases prior to electrostatic precipitation: conditioning by chemical additives, e.g. with SO3

Family

Application61/752,167Us provisional application · filed 14 Jan 2013
US 10,018,356 B2Related patent
US 2017/0227216 A9Published application
US 2014/0196639 A1This patent

From the US filing history. Foreign family members aren’t listed.

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