Cost based control of air pollution control

• US 7,634,417 B2
• Filed: 08/27/2004
• Issued: 12/15/2009
• Est. Priority Date: 08/27/2004
• Status: Active Grant

• Current Assignee: General Electric Technology GmbH (GE Aerospace)
• Original Assignee: Alstom Technology Ltd. (Alstom SA)
• Inventors: Piche, Stephen, Boyden, Scott A.
• Primary Examiner(s): Mooneyham; Janice A.
• Assistant Examiner(s): RIVIERE, HEIDI M
• Application Number:
  US10/927,049
• Publication Number:
  US 20060047526A1
• Time in Patent Office: 1,936 Days
• Field of Search: 705/1
• US Class Current: 705/1.1
• CPC Class Codes: B01D 53/346 Controlling the process
• CPC Class Codes: B01D 53/504 characterised by a specific device
• CPC Class Codes: G06Q 10/06 Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
• CPC Class Codes: G06Q 30/0283 Price estimation or determination
• CPC Class Codes: G06Q 40/00 Finance; Insurance; Tax strategies; Processing of corporate or income taxes

Abstract

A controller for directing operation of an air pollution control (APC) system, requires a consumable to perform a process to control emissions of a pollutant. The process has multiple process parameters (MPPs). One or more of the MPPs is a controllable process parameters (CTPPs) and one of the MPPs is an amount of the pollutant (AOP) emitted by the system. A defined AOP value (AOPV) represents a limit on an actual value (AV) of the emitted AOP. An interface receives a value corresponding to a unit cost of the consumable. A control processor determines the cost of operating the system based on the received value corresponding to the unit cost of the consumable, and directs control of at least one of CTPPs based on the current value of that CTPP and the determined operating cost.

Claims

1. A controller for controlling an air pollution control (APC) process, in which a consumable is required to control emissions of a pollutant, the APC process having multiple process parameters (MPPs), one or more of the MPPs being controllable process parameters (CTPPs) and one of the MPPs being an amount of the pollutant (AOP) emitted, and having a defined AOP value (AOPV) representing a limit on an actual value (AV) of the emitted AOP, comprising:

an interface configured to receive a value corresponding to a unit cost of the consumable; and

a control processor configured with logic (i) to determine a first cost of performing the APC process based on the received value corresponding to the unit cost of the consumable and on a first respective value of each of at least one of the MPPs, and a second cost of performing the APC process based on the received value corresponding to the unit cost of the consumable and on a second respective value, different than the first respective value, of each of the at least one MPP, and (ii) to direct control of at least one of the one or more CTPPs based on a current value of that CTPP and either the determined first process performance cost or the determined second process performance cost.

2. The controller according to claim 1, wherein:

the at least one MPP includes the at least one CTPP.

3. The controller according to claim 1, wherein:

the control processor is configured with the further logic to determine a current cost of performing the APC process in real time.

4. The controller according to claim 1, wherein:

the control processor is configured with the further logic to direct control of the at least one CTPP based also on a current AV of the emitted AOP and the AOPV.

5. The controller according to claim 1, further comprising:

a neural network process model or a non-neural network process model representing a relationship between each of the at least one CTPP and the emitted AOP; and

wherein the control processor is configured with the further logic to direct control of the at least one CTPP based also on the neural or non-neural network process model.

6. The controller according to claim 5, wherein:

the neural or non-neural network process model includes one of a first principle model, a hybrid model, and a regression model.

7. The controller according to claim 1, wherein:

the APC process is a wet flue gas desulfurization (WFGD) process that receives SO₂ laden wet flue gas, and consumes externally generated electrical energy to apply reactant to remove SO₂ from the received SO₂ laden wet flue gas and thereby control emissions of SO₂, and exhausts desulfurized flue gas;

the at least one CTPP includes a first load representing an amount of the reactant applied;

the AOP is an amount of SO₂ in the exhausted desulfurized flue gas;

the consumable is the externally generated electrical energy; and

the determined first cost of performing the WFGD process is based on the value corresponding to the unit cost of the externally generated electrical energy and a first future value of the first load, the determined second cost of performing the WFGD process is based on the value corresponding to the unit cost of the externally generated electrical energy and a second future value of the first load, and control is directed of the first load based on a current value of the first load and on either the determined first or the determined second process performance cost.

8. The controller according to claim 7, wherein:

the WFGD process also consumes externally generated electrical energy to apply oxidation air to crystallize the SO₂ removed from the received SO₂ laden wet flue gas; and

the at least one CTPP also includes a second load representing an amount of the oxidation air applied; and

the determined first cost of performing the WFGD process is based also on a first future value of the second load, the determined second cost of performing the WFGD process is based also on a second future value of the second load, and control is directed of the amount of applied oxidation air based also on a current value of the second load.

9. The controller according to claim 1, wherein:

the APC process is a selective catalytic reduction (SCR) process that receives NO_x laden flue gas, applies ammonia and dilution air to remove NO_x from the received NO_x laden flue gas, thereby consuming ammonia and controlling emissions of NOR, and exhausts reduced NO_x flue gas;

the at least one CTPP includes a parameter corresponding to an amount of the ammonia applied;

the AOP is an amount of NO_x in the exhausted flue gas;

the consumable is the ammonia; and

the determined first cost of performing the SCR process is based on a first future value of the amount of ammonia to be applied, the determined second cost of performing the process is based on a second future value of the amount of ammonia to be applied, and control is directed of the amount of ammonia applied based on the current value of the amount of ammonia being applied and either the determined first or the determined second process performance cost.

10. The controller according to claim 1, wherein:

the first respective value of each of the at least one MPP is a first future adjusted value of each of the at least one MPP and the second respective value of each of the at least one MPP is a second future adjusted value of each of the at least one MPP; and

the determined first cost of performing the APC process is a first predicted cost of performing the APC process based on the first future adjusted value of each of the at least one MPP and the determined second cost of performing the APC process is a second predicted cost of performing the APC process based on the second future adjusted value of each of the at least one MPP.

11. The controller according to claim 1, further comprising:

an user input device configured to input the value corresponding to the unit cost of the consumable and an operational priority;

wherein (i) the interface receives the input value corresponding to the unit cost of the consumable and the operational priority, (ii) the control processor is configured with further logic to select either the determined first or the determined second cost of performing the APC process based on the received operational priority, and (iii) control of the at least one CTPP is based on the selected determined cost of performing the APC process.

12. An article of manufacture for controlling an air pollution control (APC) process, in which a consumable is required to control emissions of a pollutant, the APC process having multiple process parameters (MPPs), one or more of the MPPs being controllable process parameters (CTP Ps) and one of the MPPs being an amount of the pollutant (AOP) emitted, and having a defined AOP value (AOPV) representing a limit on an actual value (AV) of the emitted AOP, comprising:

computer readable storage medium; and

computer programming stored on the storage media, wherein the stored computer programming is configured to be readable by one or more computers and thereby cause the one or more computers to operate so as to;

determine a first cost of performing the APC process based on a value corresponding to a unit cost of the consumable and on a first respective value of each of at least one of the MPPs, and a second cost of performing the APC process based on the value corresponding to the unit cost of the consumable and on a second respective value, different than the first respective value, of each of the at least one MPP; and

direct control of at least one of the one or more CTPPs based on a current value of that CTPP and either the determined first process performance cost or the determined second process performance cost.

13. The article of manufacture according to claim 12, wherein:

the at least one MPP includes the at least one CTPP.

14. The article of manufacture according to claim 12, wherein:

the stored computer programming is further configured to cause the one or more computers to operate so as to determine a current cost of performing the APC process in real time.

15. The article of manufacture according to claim 12, wherein:

control of the at least one CTPP is directed based also on a current AV of the emitted AOP and the AOPV.

16. The article of manufacture according to claim 12, wherein:

control of the at least one CTPP is directed based also on a neural network process model or a non-neural network process model representing a relationship between each of the at least one CTPP and the emitted AOP.

17. The article of manufacture according to claim 16, wherein:

the neural or non-neural network process model includes one of a first principle model, a hybrid model, and a regression model.

18. The article of manufacture according to claim 12, wherein:

the APC process is a wet flue gas desulfurization (WFGD) process that consumes externally generated electrical energy to apply reactant to remove SO₂ from SO₂ laden wet flue gas and thereby control emissions of SO₂, and exhausts desulfurized flue gas;

the at least one CTPP includes an amount of the reactant applied;

the AOP is an amount of SO₂ in the exhausted desulfurized flue gas;

the consumable is the externally generated electrical energy;

the first cost of performing the WFGD process is determined -based on the value corresponding to the unit cost of the externally generated electrical energy and a first future value for the amount of reactant to be applied, and the determined second cost of performing the WFGD process is based on the value corresponding to the unit cost of the externally generated electrical enemy and a second future value for the amount of reactant to be applied; and

control of the amount of reactant applied is directed based on a current value of the amount of reactant being applied and either the determined first cost or the determined second cost of performing the WFDG process.

19. The article of manufacture according to claim 18, wherein:

the WFGD process also consumes externally generated electrical energy to apply oxidation air to crystallize the SO₂ removed from the SO₂ laden wet flue gas; and

the at least one CTPP also includes an amount of the oxidation air applied;

the first cost of performing the WFGD process is determined based also on a first future value for the amount of oxidation air to be applied, and the second cost of performing the WFGD process is based also on a second future value for the amount of oxidation air to be applied; and

control of the amount of oxidation air applied is directed based also on a current value of the amount of oxidation air being applied.

20. The article of manufacture according to claim 12, wherein:

the APC process is a selective catalytic reduction (SCR) process that applies ammonia and dilution air to remove NO_x from NO_x laden flue gas, thereby consuming ammonia and controlling emissions of NOR_x, and exhausts reduced NO_x flue gas;

the at least one CTPP includes a parameter corresponding to an amount of the ammonia applied;

the AOP is an amount of NO_x in the exhausted flue gas;

the consumable is the ammonia;

the first cost of performing the SCR process is determined based on the value corresponding to the unit cost of the ammonia and a first future value for the amount of ammonia to be applied and the second cost of performing the SCR process is determined based on the value corresponding to the unit cost of the ammonia and a second future value for the amount of ammonia to be applied; and

control of the amount of ammonia applied is directed based on a current value of the amount of ammonia being applied and either the determined first cost or the determined second cost of performing the SCR process.

21. The article of manufacture according to claim 12, wherein:

the first respective value of each of the at least one MPP is a first respective future adjusted value of each of the at least one MPP and the second respective value of each of the at least one MPP is a second respective future adjusted value of each of the at least one MPP; and

the first cost of performing the APC process is determined by predicting a first cost of performing the APC process based on the first respective future adjusted value of each of the at least one MPP, and the second cost of performing the APC process is determined by predicting a second cost of performing the APC process based on the second respective future adjusted value of each of the at least one MPP.