Intelligent chemistry management system

• US 4,833,622 A
• Filed: 11/03/1986
• Issued: 05/23/1989
• Est. Priority Date: 11/03/1986
• Status: Expired due to Fees

• Current Assignee: Combustion Engineering Incorporated (ABB Limited)
• Original Assignee: Combustion Engineering Incorporated (ABB Limited)
• Inventors: Gabrielli, Frank, Barto, Ronald J., Mohn, Nancy C.
• Primary Examiner(s): Lall, Parshotam S.
• Assistant Examiner(s): Teska, Kevin J.
• Application Number:
  US06/925,936
• Time in Patent Office: 932 Days
• Field of Search: 364/496, 364/497, 364/510, 364/550, 364/570, 364/494, 364/509, 364/556, 73/61.2, 73/865.6, 73/863.31, 324/71.1,65 CR, 204/1 T, 204/404, 122/379, 422/62
• US Class Current: 700/271
• CPC Class Codes: F01K 21/06 Treating live steam, other than thermodynamically, e.g. for fighting deposits in engine
• CPC Class Codes: F22D 11/006 Arrangements of feedwater cleaning with a boiler

Abstract

A system (10) particularly suited for employment for purposes of effectuating the monitoring, diagnosing and controlling of the chemistry of the water and steam in a steam generator steam cycle (46). The subject system (10) is operative to monitor water and steam quality at a number of critical locations (70,72,74,76) in the steam generator steam cycle (46). Based on the information gathered through such monitoring of water and steam quality, the subject system (10) is designed to be operative to provide diagnoses of potential causes of upsets in the steam generator steam cycle chemistry and to suggest corrective actions as appropriate. Furthermore, historical data is also readily available from the subject system (10) which can be utilized for identifying trends and for assessing the operational chemistry of the steam generator steam cycle (46) both on a short-term basis and on a long-term basis.

Claims

1. A system for monitoring the chemistry of water and steam in a steam generator steam cycle to detect deviations thereof from specified levels, for diagnosing the need for corrections to be made in the chemistry of water and steam in the steam generator steam cycle, and for controlling the chemistry of water and steam in the steam generator steam cycle by implementing control corrections that are required to restore the chemistry of water and stem in the steam generator steam cycle to specified levels, comprising:

(a) monitoring means for monitoring the chemistry of water and steam at a plurality of preestablished locations in the steam generator steam cycle so as to detect deviations in the chemistry of water and steam from specified levels, said monitoring means generating signals in the form of data provided from process instrumentation and in the form of data provided from samples obtained by means of continuous analyzers positioned at preestablished locations in the steam generator steam cycle representative of the chemistry of water and steam being monitored by said monitoring means, said continuous analyzers being positioned at a minimum of four preestablished locations in the steam generator steam cycle, a first one of said continuous analyzers being positioned at a first location in the steam generator steam cycle so as to provide data pertaining to conductivity of the feedwater of the steam generator steam cycle, a second one of said continuous analyzers being positioned at a second location in the steam generator steam cycle so as to provide data pertaining to a presence of ammonia, pH, hydrazine and dissolved oxygen in the feedwater of the steam generator steam cycle, a third one of said continuous analyzers being positioned at a third location in the steam generator steam cycle so as to provide data pertaining to the presence of pH, phosphate and silica in boilerwater of the steam generator steam cycle as well as data pertaining to specific conductivity of boilerwater of the steam generator steam cycle, and a fourth one of said continuous analyzers being positioned at a fourth location in the steam generator steam cycle so as to provide data pertaining to cation conductivity of steam of the steam generator steam cycle;

(b) diagnosing means connected in circuit relation with said monitoring means for receiving signals from said monitoring means as an input to said diagnosing means, said diagnosing means having a preestablished bank of data stored therein pertaining to optimization of the chemistry of water and steam in a steam generator steam cycle, said diagnosing means in response to signals being received thereby from said monitoring means indicating deviations in the chemistry of water and steam in the steam generator steam cycle from specified levels establishing corrections that are required to be made in the chemistry of water and steam in the steam generator steam cycle to restore the chemistry of water and steam in the steam generator steam cycle to specified levels, said diagnosing means further when a need for such corrections in the chemistry of water and steam in the steam generator steam cycle is deemed to exist producing an output representative of the nature of corrections that are required to be made in the chemistry of water and steam in the steam generator steam cycle to restore the chemistry of water and steam to specified levels; and

(c) control means connected in circuit relation with said diagnosing means for receiving said output therefrom, said control means having a preestablished bank of data stored therein pertaining to control of the chemistry of water and steam in a steam generator steam cycle, said control means upon receipt of said output from said diagnosing means establishing control corrections that are required to be made to the chemistry of water and steam in the steam generator steam cycle to restore the chemistry of water and steam to specified levels, said control means further effecting the implementation of control corrections that are required to be made to restore the chemistry of water and steam in the steam generator steam cycle to specified levels.

2. The system as set forth in claim 1 further including manual means connected in circuit relation with said diagnosing means and said control means, said manual means effecting a selective introduction of new constants into the system, said manual means further effecting a manual inputting of data into the system.

3. The system as set forth in claim 2 further including scanner means connected in circuit relation with said monitoring means, said scanner means determining frequency with which and nature of the monitoring performed by said monitoring means.

4. The system as set forth in claim 3 further including display means connected in circuit relation with said manual means, said display means selectively effecting a visual display of real-time data, diagnostic messages and warning messages.

5. The system as set forth in claim 4 further including analysis means connected in circuit relation with said display means, said analysis means effecting a visual display of graphs and tables reflecting operational trends in the chemistry of water and steam in the steam generator steam cycle.