Abstract The invention relates to a method for the drying treatment of coals, where floating coals which are ground into desired grain sizes on a drying hot current whose temperature is controlled to provide a fluidized drying operation wherein the method mixes the combustion waste gas whose temperature is less than that of the desired current into one part at least of said drying hot current to control the temperature as well to make use of the enthalpy of said combustion waste gas, and besides this method maintains oxygen bearing on the drying hot current low, thereby accomplishing any one or two of the purposes of decreasing the using amount of heat-source or combustion gas for drying treatment, increasing the treating amount of drying coals and moderating the control of the temperature, and thus the method safely and exactly dries coals by means of the comparatively miniaturized drying installation and the simple measuring means.
Inventors
👤 K Sasguri
👤 K Hamada
👤 M Yamagishi
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-31 22:13
CPC Classifications
C; C10; C10B; C10B57/00; C10B57/08; C10B57/10
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
99 words
In a fluidized drying operation wherein coals of a desired grain sizes are floated on a drying hot current provided by a combustion gas, a method of lowering the temperature and reducing percentage of oxygen in said drying hot current consisting in mixing a combustion waste gas of a temperature which is less than that of the desired drying current and whose oxygen content is small, into the combustion of the drying hot current gas to adjust the temperature of said combustion gas to between 450* and 600* C making use of the enthalpy in said combustion waste gas.
Claim 2
Dependent Claim
99 words
In a fluidized drying operation wherein coals of a desired grain sizes are floated on a drying hot current provided by a combustion gas, a method of lowering the temperature and reducing percentage of oxygen in said drying hot current consisting in mixing a combustion waste gas of a temperature which is less than that of the desired drying current and whose oxygen content is small, into the combustion of the drying hot current gas to adjust the temperature of said combustion gas to between 450* and 600* C making use of the enthalpy in said combustion waste gas.
Claim 3
Dependent Claim
26 words
A method according to claim 1, wherein said combustion waste gas is obtained from a coke oven waste gas having a temperature of around 250* C.