EP0132974A2
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EP
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Safety systems for coal pulverizers
Assignee: Babcock and Wilcox Co
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Filing: 1984-07-06
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Granted: —
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Expires: 2004-07-06
Abstract
Abstract A safety control system for a coal pulverizer utilizes signals (20,22) representing net oxygen and carbon monoxide measurements of the pulverizer atmosphere. A signal (50) representing the rate of carbon monoxide change is derived form the signal (22) by a derivative controller (48). The signals (20,50) representing the net oxygen measurement and rate of carbon monoxide change are compared in respective comparing means (36,52) with respective setpoints (38,54) to generate control signals (46,62) for actuating alarms (26,28). The pulverized oxygen and actual carbon monoxide signals (20,22) are compared in respective comparing means (64,88) with respective setpoints (66,90) to generate control signals (74,98) for causing automatic inerting of the pulverizer by supplying carbon dioxide thereto.
Inventors
- 👤 Marshall Cooper
- 👤 Robert Pocock
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 21:17
CPC Classifications
B; B02; B02C; B02C25/00; F; F23; F23K; F23K1/00; B02C23/00; B02C23/04; F23K2201/00; F23K2201/10
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
97 words
A safety system for a coal pulverizer (12), the safety system (8) comprising: means (10, 16) for measuring the actual net oxygen level in the coal pulverizer (12) and establishing a signal (20) indicative thereof; means (36) for comparing the signal (20) from the net oxygen measuring means (10, 16) with a predetermined setpoint signal (38) indicative of a potentially hazardous net oxygen level and establishing a control signal (46) therefrom; and alarm means (26) responsive to the control signal (46) to indicate an alarm condition indicative of a potentially hazardous condition in the coal pulverizer (12).
Claim 2
Dependent Claim
97 words
A safety system for a coal pulverizer (12), the safety system (8) comprising: means (10, 16) for measuring the actual net oxygen level in the coal pulverizer (12) and establishing a signal (20) indicative thereof; means (36) for comparing the signal (20) from the net oxygen measuring means (10, 16) with a predetermined setpoint signal (38) indicative of a potentially hazardous net oxygen level and establishing a control signal (46) therefrom; and alarm means (26) responsive to the control signal (46) to indicate an alarm condition indicative of a potentially hazardous condition in the coal pulverizer (12).
Claim 3
Dependent Claim
92 words
A safety system according to claim 1, including: means (48) for determining the actual rate of carbon monoxide level change in the coal pulverizer (12) and establishing a signal (50) indicative thereof; and means (52) for comparing the signal (50) from the determining means (48) with a predetermined setpoint signal (54) indicative of a potentially hazardous rate of carbon monoxide level change in the coal pulverizer (12) and establishing a control signal (62) therefrom, the alarm means (28) being responsive also to the control signal (62) established by the comparing means (52).
Claim 4
Dependent Claim
73 words
A safety system according to claim 1 or claim 2, including: means (64) for comparing the signal (20) from the net oxygen measuring means (10, 16) with a second predetermined oxygen level setpoint signal (66) lower than the first-mentioned predetermined oxygen level setpoint signal (38) and establishing a control signal (74) therefrom; and inerting means responsive to the control signal (74) established by the comparing means (64) for inerting the coal pulverizer (12).
Claim 5
Dependent Claim
58 words
A safety system according to claim 3, wherein the inerting means includes: a source of carbon dioxide for providing an inerting atmosphere to the coal pulverizer (12); valve means (30) for controlling the source of carbon dioxide; and controller means (78) responsive to the signal (20) from the measuring means (10, 16) for controlling the valve means (30).
Claim 6
Dependent Claim
46 words
A safety system according to claim 4, including switching means (76) mounted between the controller means (78) and the valve means (30) and responsive to the control signal (74) established by the comparing means (64) to allow control of the valve means by the controller means.
Claim 7
Dependent Claim
96 words
A safety system for a coal pulverizer (12), the safety system (8) comprising: means for determining the actual rate of carbon monoxide level change in the coal pulverizer (12) and establishing a signal (50) indicative thereof; means (52) for comparing the signal (50) from the determining means with a predetermined setpoint signal (54) indicative of a potentially hazardous rate of carbon monoxide level change in the coal pulverizer and establishing a control signal (62) therefrom; and alarm means (28) responsive to the control signal (62) for indicating a potentially hazardous condition in the coal pulverizer (12).
Claim 8
Dependent Claim
96 words
A safety system for a coal pulverizer (12), the safety system (8) comprising: means for determining the actual rate of carbon monoxide level change in the coal pulverizer (12) and establishing a signal (50) indicative thereof; means (52) for comparing the signal (50) from the determining means with a predetermined setpoint signal (54) indicative of a potentially hazardous rate of carbon monoxide level change in the coal pulverizer and establishing a control signal (62) therefrom; and alarm means (28) responsive to the control signal (62) for indicating a potentially hazardous condition in the coal pulverizer (12).
Claim 9
Dependent Claim
61 words
A safety system according to claim 6, wherein the determining means includes: means (10, 16) for measuring the actual carbon monoxide level in the coal pulverizer (12); and a derivative action controller (48) connected to the measuring means (10, 16) for providing the output signal (50) indicative of the rate of actual carbon monoxide level change in the coal pulverizer (12).
Claim 10
Dependent Claim
60 words
A safety system according to claim 7, including: means (88) for comparing a signal (22) from the measuring means (10, 16) with a predetermined setpoint signal (90) indicative of a hazardous carbon monoxide level in the coal pulverizer (12) and establishing a control signal (98) therefrom; and inerting means responsive to the control signal for inerting the coal pulverizer (12).
Claim 11
Dependent Claim
72 words
A safety system according to claim 8, including: means (10, 16) for measuring the actual net oxygen level in the coal pulverizer (12) and establishing a signal (20) indicative thereof; and means (36) for comparing the signal (20) from the net oxygen measuring means (10, 16) with a predetermined setpoint signal (38) indicative of a potentially hazardous net oxygen level and establishing a control signal (46) for actuating the alarm means (26).
Claim 12
Dependent Claim
53 words
A safety system according to claim 9, including: means (64) for comparing the signal from the net oxygen measuring means (10, 16) with a second predetermined oxygen level setpoint signal (66) lower than the first-mentioned predetermined oxygen level setpoint signal (38) and establishing a control signal (74) therefrom for actuating the inerting means.
Claim 13
Dependent Claim
64 words
A safety system according to claim 10, wherein the inerting means includes: a source of inerting atmosphere for inerting the coal pulverizer (12); valve means (30) for controlling the source of inerting atmosphere; and controller means (78) responsive to the signal (20) from the means (10, 16) for measuring the net oxygen level in the coal pulverizer (12) for controlling the valve means (30).
Claim 14
Dependent Claim
94 words
A safety system according to claim 11, including switching means (76) mounted between the controller means (78) and the valve means (30) and responsive either to the control signal (98) from the comparing means (88) comparing the absolute carbon monoxide level in the coal pulverizer (12) with the predetermined setpoint signal (90) or the control signal (74) from the comparing means (64) comparing the net oxygen level in the coal pulverizer (12) with the second predetermined oxygen level setpoint signal (66) for allowing control of the valve means (30) by the controller means (78).
Claim 15
Dependent Claim
136 words
A safety system for a coal pulverizer (12), the safety system (8) comprising: means (10, 16) for measuring the actual net oxygen level in the coal pulverizer (12) and establishing a signal (20) indicative thereof; means (10, 16, 48) for measuring the rate of change of carbon monoxide level in the coal pulverizer (12) and establishing a signal (50) indicative thereof; comparing means (36, 52) for comparing the signals (20, 50) established by the net oxygen measuring means (10, 16) and the rate of carbon monoxide change measuring means (10, 16, 48) with predetermined setpoints (38, 54) for establishing respectively independent control signals (46, 62) whenever the predetermined setpoints are exceeded; and alarm means (26, 28) responsive to either of the control signals (46, 62) for indicating a potentially hazardous condition in the coal pulverizer (12).
Claim 16
Dependent Claim
136 words
A safety system for a coal pulverizer (12), the safety system (8) comprising: means (10, 16) for measuring the actual net oxygen level in the coal pulverizer (12) and establishing a signal (20) indicative thereof; means (10, 16, 48) for measuring the rate of change of carbon monoxide level in the coal pulverizer (12) and establishing a signal (50) indicative thereof; comparing means (36, 52) for comparing the signals (20, 50) established by the net oxygen measuring means (10, 16) and the rate of carbon monoxide change measuring means (10, 16, 48) with predetermined setpoints (38, 54) for establishing respectively independent control signals (46, 62) whenever the predetermined setpoints are exceeded; and alarm means (26, 28) responsive to either of the control signals (46, 62) for indicating a potentially hazardous condition in the coal pulverizer (12).
Claim 17
Dependent Claim
85 words
A safety system according to claim 13, including: comparing means (64) for comparing the signal (20) indicative of the actually measured net oxygen level in the coal pulverizer (12) with a setpoint (66) indicative of a hazardous condition in the coal pulverizer and establishing an inerting signal (74) whenever the actual net oxygen level in the coal pulverizer exceeds this setpoint (66); and automatic inerting means (76, 78, 30) responsive to the inerting signal (74) for providing an inerting atmosphere to the coal pulverizer (12).
References Cited (Backward Citations)
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