Fuel reforming system and control method of fuel reforming system

Abstract

A fuel reforming system includes a reformer that produces fuel gas that includes hydrogen by reforming a reforming fuel by a steam reforming reaction using reforming water, and; supply amount regulating means for regulating an amount of the reforming water supplied to the reformer; pressure detecting means for detecting a gas pressure in the reformer; and correcting means for correcting the amount of supplied reforming water with the supply amount regulating means based on a fluctuation amount in the gas pressure detected by the pressure detecting means.

1 - 20 . (canceled) 
     
     
         21 . A fuel reforming system comprising:
 a reformer that produces fuel gas that includes hydrogen by reforming a reforming fuel by a steam reforming reaction using reforming water, and;   a supply amount regulating unit that regulates an amount of the reforming water supplied to the reformer;   a pressure detecting unit that detects a gas pressure in the reformer; and   a correcting unit that corrects the amount of supplied reforming water with the supply amount regulating unit based on a fluctuation amount in the gas pressure detected by the pressure detecting unit,   wherein the correcting unit corrects the amount of supplied reforming water with the supply amount regulating unit based on a standard deviation of the gas pressure detected by the pressure detecting unit.   
     
     
         22 . The fuel reforming system according to  claim 21 , wherein the correcting unit performs a correction that decreases the amount of supplied reforming water, when the standard deviation of the gas pressure exceeds a first predetermined value. 
     
     
         23 . The fuel reforming system according to  claim 21 , wherein the correcting unit performs a correction that increases the amount of supplied reforming water, when the standard deviation of the gas pressure falls below a second predetermined value. 
     
     
         24 . The fuel reforming system according to  claim 21 , wherein
 the correcting unit performs a correction that decreases the amount of supplied reforming water, when the standard deviation of the gas pressure exceeds a first predetermined value, or the correcting unit performs a correction that increases the amount of supplied reforming water, when the standard deviation of the gas pressure falls below a second predetermined value; and   the first predetermined value is larger than the second predetermined value.   
     
     
         25 . The fuel reforming system according to  claim 24 , wherein the first predetermined value and the second predetermined value are determined by a ratio between a number of moles of the reforming water supplied to the reformer and a number of moles of carbon in the reforming fuel supplied to the reformer. 
     
     
         26 . The fuel reforming system according to  claim 25 , wherein
 the ratio of the number of moles of the reforming water to the number of moles of the carbon of the first predetermined value is 3:1; and   the ratio of the number of moles of the reforming water to the number of moles of the carbon of the second predetermined value is 2:1.   
     
     
         27 . The fuel reforming system according to  claim 24 , wherein the correcting unit does not correct the amount of supplied reforming water when the standard deviation of the gas pressure does not exceed the first predetermined value, and the standard deviation of the gas pressure does not fall below the second predetermined value. 
     
     
         28 . The fuel reforming system according to  claim 21 , wherein the correcting unit does not correct the amount of supplied reforming water with the supply amount regulating unit when the amount of fluctuation in a reforming amount of the reformer exceeds a third predetermined value. 
     
     
         29 . The fuel reforming system according to  claim 21 , further comprising a setting unit that sets an amount of reforming fuel supplied to the reformer,
 wherein the correcting unit does not correct the amount of supplied reforming water with the supply amount regulating unit when a difference between a reforming water supply amount derived based on the amount of supplied reforming fuel set by the setting unit and a reforming water supply amount derived based on the gas pressure detected by the pressure detecting unit exceeds a fourth predetermined value.   
     
     
         30 . The fuel reforming system according to  claim 21 , wherein a correction range of the reforming water supply amount corrected by the correcting unit is changed according to a reforming amount of the reformer. 
     
     
         31 . A control method of a fuel reforming system that regulates an amount of reforming water supplied to a reformer that produces fuel gas that includes hydrogen by reforming a reforming fuel by a steam reforming reaction using the reforming water, the control method comprising:
 detecting a gas pressure in the reformer; and   correcting the amount of supplied reforming water based on a fluctuation amount in the detected gas pressure,   wherein the amount of supplied reforming water is corrected based on a standard deviation of the detected gas pressure.   
     
     
         32 . The control method according to  claim 31 , wherein a correction that decreases the amount of supplied reforming water is performed when the standard deviation of the gas pressure exceeds a first predetermined value. 
     
     
         33 . The control method according to  claim 31 , wherein a correction that increases the amount of supplied reforming water is performed when the standard deviation of the gas pressure falls below a second predetermined value. 
     
     
         34 . The control method according to  claim 31 , wherein:
 a correction that decreases the amount of supplied reforming water is performed when the standard deviation of the gas pressure exceeds a first predetermined value, or a correction that increases the amount of supplied reforming water is performed when the standard deviation of the gas pressure falls below a second predetermined value; and   the first predetermined value is larger than the second predetermined value.   
     
     
         35 . The control method according to  claim 34 , wherein the first predetermined value and the second predetermined value are determined by a ratio between a number of moles of the reforming water supplied to the reformer and a number of moles of carbon in the reforming fuel supplied to the reformer. 
     
     
         36 . The control method according to  claim 35 , wherein:
 the ratio of the number of moles of the reforming water to the number of moles of the carbon of the first predetermined value is 3:1; and   the ratio of the number of moles of the reforming water to the number of moles of the carbon of the second predetermined value is 2:1.   
     
     
         37 . The control method according to  claim 34 , wherein the amount of supplied reforming water is not corrected when the standard deviation of the gas pressure does not exceed the first predetermined value, and the standard deviation of the gas pressure does not fall below the second predetermined value. 
     
     
         38 . The control method according to  claim 31 , wherein the amount of supplied reforming water is not corrected when the amount of fluctuation in a reforming amount of the reformer exceeds a third predetermined value. 
     
     
         39 . The control method according to  claim 31 , further comprising setting an amount of reforming fuel supplied to the reformer,
 wherein the amount of supplied reforming water is not corrected when a difference between a reforming water supply amount derived based on the set amount of supplied reforming fuel and a reforming water supply amount derived based on the detected gas pressure exceeds a fourth predetermined value.   
     
     
         40 . The control method according to  claim 31 , wherein a correction range of the corrected reforming water supply amount is changed according to a reforming amount of the reformer.