Design And Test of An Electric Furnace Pyrometer
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Thus, (16) Lg-Li - K (tg-t^) The differential millivoltmeter may be calibrated to read, the difference between furnace and room temperature; or it may be calibrated to read o/o excess air directly.
Thus, for the first case, we combine equations (4a) - 22 - relation is given by equation (21a), It is to be noted al- so, that if in the case of theoreticel air requirements, the assumption of 12,000 Btu/# coal has an error of say 10;i>, then since .00008 is about 10;^ of .00075, a lOfo error in -che... former results in only 10^ of 10^ or Ijb in the sum of .00075-t- .00008 - ,00083. For lOO;^ excess air this error is reduced to ^j£, etc. Since the usual condition is lOO^o or more excess air, the approximation of 1^ - .00008 is within permissible H " limits of error, and equation (21a) is justified.
Evidently then by combining equations (17) and (21a) we can get a direct relation between millivoltmeter readings, e,-e, and fj air, n, used in the furnace , Thus we have, (22) t - t^r 337diV(e2-«i) _ ^ _^ ^ f ?r-CT?S7ur g a- ( 7.5n , .00008) (10,000 ) Cp or (23) ( kf (1 n)-fVL - .00008 ) lO.OCO =: n =g587di vC (eg-e;^) ) 7.6 ( ) - 3.45 kf (l-{-n)VL 1 - .107 = Kg - .107 di V C eo-e ^i ^ p «2-«l e^^e^ whe re , K ~ 3.45Kf ( 14-n ) UL ^1 ^ S by means of the last equation, the millivoltmeter may evident- ly be calibrated to read jit air in furnace directly.
What to read after Design And Test of An Electric Furnace Pyrometer?
You can find similar books in the "Read Also" column, or choose other free books by Naiman, Julius M to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Thus, (16) Lg-Li - K (tg-t^) The differential millivoltmeter may be calibrated to read, the difference between furnace and room temperature; or it may be calibrated to read o/o excess air directly.
Thus, for the first case, we combine equations (4a) - 22 - relation is given by equation (21a), It is to be noted al- so, that if in the case of theoreticel air requirements, the assumption of 12,000 Btu/# coal has an error of say 10;i>, then since .00008 is about 10;^ of .00075, a lOfo error in -che... former results in only 10^ of 10^ or Ijb in the sum of .00075-t- .00008 - ,00083. For lOO;^ excess air this error is reduced to ^j£, etc. Since the usual condition is lOO^o or more excess air, the approximation of 1^ - .00008 is within permissible H " limits of error, and equation (21a) is justified.
Evidently then by combining equations (17) and (21a) we can get a direct relation between millivoltmeter readings, e,-e, and fj air, n, used in the furnace , Thus we have, (22) t - t^r 337diV(e2-«i) _ ^ _^ ^ f ?r-CT?S7ur g a- ( 7.5n , .00008) (10,000 ) Cp or (23) ( kf (1 n)-fVL - .00008 ) lO.OCO =: n =g587di vC (eg-e;^) ) 7.6 ( ) - 3.45 kf (l-{-n)VL 1 - .107 = Kg - .107 di V C eo-e ^i ^ p «2-«l e^^e^ whe re , K ~ 3.45Kf ( 14-n ) UL ^1 ^ S by means of the last equation, the millivoltmeter may evident- ly be calibrated to read jit air in furnace directly.
What to read after Design And Test of An Electric Furnace Pyrometer?
You can find similar books in the "Read Also" column, or choose other free books by Naiman, Julius M to read onlineMoreLess
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