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US 5,401,364 AGranted
Process for treating noncaking, noncoking coal to form char with process derived gaseous fuel having a variably controllable calorific heating value
AssigneeSGI International, Inc.
InventorFranklin G. Rinker
Life of this patent
Estimating the term…
Abstract
According to this invention there is provided a process for the heat treatment of noncaking, noncoking coal with a process derived gaseous fuel having a variably controllable calorific heating value.
Claims17
A process for treating noncaking, noncoking coal to form char with a process derived gaseous fuel having a variably controllable calorific heating value, the process comprising the steps of:
- a) combusting a controlled admixture of fuel, air and process derived gaseous fuel within a combustor to form oxygen deficient products of combustion having a temperature between 1600 degrees fahrenheit and 1950 degrees fahrenheit;
- b) admixing the oxygen deficient products of combustion from the second combustor with low sensible heat dryer gas to form attemperated high sensible heat dryer gas containing no more than 5% by weight oxygen;
- c) drying the coal with the high sensible heat dryer gas to remove moisture therefrom;
- d) combusting a controlled admixture of externally supplied fuel, air and process derived gaseous fuel within a first combustor to form oxygen deficient products of combustion having a temperature between 1600 degrees fahrenheit and 1950 degrees fahrenheit;
- e) admixing the oxygen deficient products of combustion from the first combustor with process derived gaseous fuel to form attemperated high sensible heat pyrolyzer gas containing no more than 1% by weight oxygen;
- f) pyrolyzing the dried coal with the high sensible heat pyrolyzer gas from the first combustor to form char by mild gasification and remove thermal energy from the high sensible heat pyrolyzer gas to form low sensible heat pyrolyzer gas;
- g) separating from the low sensible heat pyrolyzer gas volatile matter and solid particles to form the process derived gaseous fuel for combusting within the first combustor, second combustor and for admixing with oxygen deficient products of combustion from the first combustor;
- h) monitoring the drying process to determine an ideal calorific heating value of the process derived gaseous fuel to the second combustor as a function of the temperature of the high sensible heat dryer gas;
- i) varying the temperature at which the low sensible heat pyrolyzer gas and volatile matter are separated so as to control the calorific heating value of the process derived gaseous fuel as a function of the temperature of the high sensible heat dryer gas;
- j) directing a controlled amount of process derived gaseous fuel to the first combustor for combustion with the fuel and air to form oxygen deficient products of combustion and directing a controlled amount of process derived gaseous fuel for admixing with the oxygen deficient products of combustion from the first combustor so as to control the temperature of the high sensible heat pyrolyzer gas;
- and
- k) venting the remaining process derived gaseous fuel to the second combustor for combustion with the fuel and air and oxidation of carbon monoxide and volatile organic compounds.
9 more elements
A process for treating noncaking, noncoking coal to form char with a process derived gaseous fuel having a variably controllable calorific heating value, the process comprising the steps:
- a) directing a controlled amount of process derived gaseous fuel to a first combustor for combustion with an auxiliary fuel and air to form oxygen deficient products of combustion and directing a controlled amount of process derived gaseous fuel for admixing with the oxygen deficient products of combustion from the first combustor to form a high sensible heat pyrolyzer gas having a controlled temperature;
- b) venting the remaining process derived gaseous fuel to a second combustor for combustion with a fuel and air and oxidation of carbon monoxide and volatile organic compounds to form oxygen deficient products of combustion for admixing with a low sensible heat dryer gas to form attemperated high sensible heat dryer gas;
- c) monitoring the drying process to determine an ideal calorific heating value of the process derived gaseous fuel to the second combustor as a function of the temperature of the high sensible heat dryer gas;
- d) drying the coal with the high sensible heat dryer gas to remove moisture therefrom;
- e) pyrolyzing the dried coal with the attemperated high sensible heat pyrolyzer gas to form char by mild gasification and remove thermal energy from the attemperated high sensible heat pyrolyzer gas to form low sensible heat pyrolyzer gas;
- f) separating from the low sensible heat pyrolyzer gas volatile matter and solid particles to form the process derived gaseous fuel for combusting within the first combustor, the second combustor and for admixing with oxygen deficient products of combustion from the first combustor;
- and
- g) varying the temperature at which the low sensible heat pyrolyzer gas and volatile matter are separated so as to control the calorific heating value of the process derived gaseous fuel as a function of the temperature of the high sensible heat dryer gas.
5 more elements
Dependencies are inferred from the claim text.