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US 4,599,140 AGranted
Method and apparatus for controlling crossflow in a double collector main coke oven battery
AssigneeBethlehem Steel Corporation
InventorEdmund G. Bauer
Life of this patent
Estimating the term…
Abstract
The flow of gases given off by a coke mass during the production of coke in a coke oven having a coke side collector main and a pusher side collector main is controlled by measuring temperature, pressure, carbon equivalent thickness and rate of carbon formation at selected locations. Electrical signals indicative of the temperature, pressure and carbon measurements are fed to an instrument system and into a computer where the measurements are compared to target values, processed and the resultant information used to control the flow of gases by regulating the gooseneck damper, standpipe control valve and/or the control valves which control collector main pressures.
Claims13
A method of controlling the crossflow of gases given off by a coal mass during the production of coke in a coke oven having a coke side collector main and a pusher side collector main comprising the steps of:
- (a) determining the temperature difference between the temperature in the coke side standpipe and the temperature in the pusher side standpipe,
- (b) determining the temperature difference between the temperature in the freespace adjacent the coke side of the coke oven and the temperature in the freespace adjacent the pusher side of the coke oven,
- (c) determining the temperature difference between the temperature of the heating wall of the coke oven adjacent the coke side of the coke oven and the temperature of the heating wall of the coke oven adjacent the pusher side of the coke oven, and
- (d) opening the coke side standpipe control valve and gooseneck damper and the pusher side standpipe control valve and gooseneck damper, if they are not in the open position, if the temperature difference of step (b) is substantially the same as the temperature difference of step (c) and the temperature difference of step (a) is greater than about 50.degree. F. in order to control crossflow.
1 more element
A method of controlling crossflow of gases given off by a coal mass during the production of coke in a coke oven having a coke side collector main and a pusher side collector main comprising the steps of:
- (a) measuring the temperature (Tcssp) of said gas in the coke side standpipe and the temperature (Tpssp) of said gas in the pusher side standpipe,
- (b) determining the temperature difference (.DELTA.Tsp) between Tcssp and Tpssp,
- (c) if .DELTA.Tsp is greater than about 50.degree. F., measuring the temperature (Tcsfs) of said gas in the freespace adjacent the coke side of said coke oven and the temperature (Tpsfs) of said gas in the freespace adjacent the pusher side of said coke oven,
- (d) determining the temperature difference (.DELTA.Tfs) between Tcsfs and Tpsfs,
- (e) measuring the temperature (Tcshw) of the heating wall of said coke oven adjacent the coke side of said coke oven and the temperature (Tpshw) of said heating wall adjacent the pusher side of said coke oven,
- (f) determining the temperature difference (.DELTA.Thw) between Tcshw and Tpshw,
- (g) if .DELTA.Tfs is substantially the same as .DELTA.Thw and .DELTA.Tsp is greater than about 50.degree. F., the coke side standpipe control valve and gooseneck damper and the pusher side standpipe control valve and gooseneck damper, if not in the open position are moved to the open position,
- (h) if .DELTA.Tfs is greater than .DELTA.Thw, measuring carbon data curve comprising carbon effective thickness (C) and rate of carbon formation (R) at the following locations:
- coke side standpipe, pusher side standpipe, freespace adjacent the coke side, and freespace adjacent the pusher side and comparing C and R against a target carbon effective thickness (SC) and a target rate of carbon formation (SRC) for such locations with SC and SRC based on freespace temperature, coal blend, type of heating system, fuel gas heating value, and time from the start of the coking cycle,
- (i) if C and R are not substantially the same as SC and SRC, respectively, measuring the pressure (Pcscm) in the coke side collector main and the pressure (Ppscm) in the pusher side collector main and determining the pressure difference (.DELTA.Pcm) between Pcscm and Ppscm,
- (j) if .DELTA.Pcm is greater than 1 mm. of water, activating pressure controllers in the collector mains to reduce .DELTA.Pcm to about 1 mm. of water or less while maintaining a pressure greater than about 6 mm. of water but less about 12 mm. of water in each collector main, and
- (k) periodically repeating the above steps beginning with step (a) above until .DELTA.Pcm is within 1 mm. of water and substantially steady in order to control crossflow.
9 more elements
The apparatus for controlling crossflow of gases given off by a coal mass during the production of coke in a coke oven having a coke side collector main and a pusher side collector main comprising:
- (a) means for measuring the temperature difference between the temperature in the coke side standpipe and the pusher side standpipe,
- (b) means for measuring the temperature difference between the temperature in the freespace adjacent the coke side of the coke oven and the temperature in the freespace adjacent the pusher side of the coke oven,
- (c) means for measuring the temperature difference between the temperature of the heating wall of the coke oven adjacent the coke side of the coke oven and the temperature of the heating wall of the coke oven adjacent the pusher side of the coke oven, and
- (d) means to open the standpipe control valves and gooseneck dampers, if the dampers are not open, if the means of paragraphs (b) and (c) measure a temperature difference substantially the same and the means of paragraph (a) measures a temperature difference greater than about 50.degree. F.;
- wherein the said means to open is in operative conjunction with the said means of paragraphs (a), (b), and (c).
2 more elements
Apparatus for controlling the crossflow of gases given off by a coal mass during the production of coke in a coke oven having a coke side collector main and a pusher side collector main comprising:
- (a) means to measure the temperature (Tcssp) of said gas in the coke side standpipe and the temperature (Tpssp) of said gas in the pusher side standpipe,
- (b) means to determine the temperature difference (.DELTA.Tsp) between Tcssp and Tpssp,
- (c) means to measure the temperature (Tcsfs) of said gas in the freespace adjacent the coke side of said coke oven and the temperature (Tpsfs) of said gas in the freespace adjacent the pusher side of side coke oven,
- (d) means to determine the temperature difference (.DELTA.Tfs) between Tcsfs and Tpsfs,
- (e) means to measure the temperature (Tcshw) of the heating wall of said coke oven adjacent the coke side of said coke oven and the temperature (Tpshw) of said heating wall adjacent the pusher side of said coke oven,
- (f) means to determine the temperature difference (.DELTA.Thw) between Tcshw and Tpshw,
- (g) means to open the coke side standpipe control valve and gooseneck damper and pusher side standpipe control valve and gooseneck damper, if not in the open position, when .DELTA.Tfs is about the same as .DELTA.Thw and .DELTA.Tsp is greater than about 50.degree. F.;
- wherein the said means to open is in operative conjunction with the means to measure .DELTA.T.sub.fs, .DELTA.T.sub.hw and .DELTA.Tsp,
- (h) means to measure carbon data curve including carbon effective thickness (C) and rate of carbon formation (RC) at the following locations:
- coke side standpipe, pusher side standpipe, freespace adjacent the coke side and freespace adjacent the pusher side and to compare C and RC against a target carbon effective thickness (SC) and a target rate of carbon formation (SRC) for such locations with SC and SRC based on freespace temperature, coal blend, type of heating system, fuel gas heating value and time from the start of the coking cycle,
- (i) means to measure the pressure (Pcscm) in the coke side collector main and the pressure (Ppscm) in the pusher side collector main when C and R are are not about the same as SC and SRC;
- wherein the said means to measure the pressure is in operative conjunction with the means to measure C,R,SC and SRC,
- (j) means to determine the pressure difference (.DELTA.Pcm) between Pcscm and Ppscm, and
- (k) means to activate pressure controllers in the collector mains to reduce .DELTA.Pcm to about 1 mm. of water or less while maintaining a pressure greater than about 6 mm. of water but less than about 12 mm. of water in each collector main.
11 more elements
Dependencies are inferred from the claim text.