In addition,the ranges of the average apparent activation energies of slow and rapid pyrolyzed chars at the carbon conversion between 90% and 98% are 59.64kJ/mol～105.92kJ/mol and(34.47kJ/mol～40.87kJ/mol),respectively,which indicates that the gasification reactions have been controlled by gas diffusion.
The test result shows that the coal gas productivity is 1.94 m3/kg, the carbon conversion 96.9%, and the cold gas efficiency up to 78.5%. Besides, corresponding consumption of oxygen, coal and steam is listed.
at the same time ,the carbon conversion and cold gas efficiency enhanced sharply,up to the maximum of 98.58%, 76.74% respectively,which were 3.7%, 6.1% higher than that of before;
For gasification, the highest gasification efficiency was 32%when temperature was 700℃and excessive air ratio was 0.6, under this condition the LHV of syngas, carbon conversion efficiency and yield of syngas were about 2150 kJ/Nm3, 80% and 2.3 Nm3/kg respectively.
The carbon conversion rate and net growth rate were positively related with feeding rate,and reached their peaks at 9.29% and 10.41% for the voluntary feeding group.
Test results indicate,that the gas quality,the gas yielding rate and the carbon conversion rate can effectively be raised by the addition of catalysts,among which sodium carbonate is most effective,limestone less and dolomite least.
This paper introduced the main equipment,process flow and the choices of technological conditions of a pilot-plant test for pressurized entrained flow gasification of coal. The main test data,with the operating pressure of 3.0 MPa and a feed of 1t/h of coal,were given. The carbon conversion rate of the test is 98.9%,and the cold gas efficiency reaches 83.2%.
The test results from a pilot plant have exhibited advanced performances in comparison with other existing coal gasification technologies in the world: the effective composition of the syngas ranges from 89% to 93% and the carbon conversion rate is over 98% along with low oxygen and coal consumptions.
The operation results indicate that the gasification technology is excellent in each technical and economical index, with the (CO + H2) of 89% ~ 93% , carbon conversion rate of 98% -99% and the cold gas efficiency of-84% . As the first one of domestic intellectual property in pressurized entrained flow gasification for pulverized coal, this technology has reached the world advanced level and will be industrialized.
After the influences of the pressure and the carbon conversion ratio on the performance of the system,gasifier and the combustor were synthetically studied,the optimum pressure and the carbon conversion ratio were obtained respectively as 2.5 MPa and 0.7.The system efficiency could achieve around 62.1% when the system operated in these two optimum parameters.
In the investigate range, the maximum gasification efficiency is 53.96% and the highest coal conversion is 92.31% for Longkou coal, 45.64% and 83.84% for Shenhua coal, 34.71%and 61.99% for Datong coal, respectively.
Methanol synthesis from CO and CO_2, and dehydration of methanol to dimethyl ether were selected as the independent reactions, CO, CO_2 and dimethyl ether as the key components.
Under the reaction conditions of temperature 140℃,pressure 0 6MPa,space velocity 1440h 1 ,CH 3OH/CO 2=2(mol ratio),the conversion of total carbon number in CO 2 and CH 3OH reached 8%,and the selectivity of dimethyl carbonate(DMC) was over 87%. The yield of DMC can be improved by adding K 2O to the Cu Ni/ZrSiO catalyst.
In order to study the CBLS char CO2-gasification characteristics with the alkali-metal catalysis existing in it, the CO2-gasification experiments of CBLS char and coal water slurry (CWS) char were analyzed by the thermobalance, XRD and SEM.
After taking into consideration the influence of the pressure and carbon conversion ratio on the performance of the system, the gasifier and the combustor were synthetically studied.
Ltd had a higher carbon conversion of 3%, a lower specific oxygen consumption of about 8%, and a lower specific carbon consumption of 2%-3% than that of Texaco CWS gasification at the Lunan Fertilizer Plant.
When mixed isolates were used as the inoculum, the accumulation of lactic acid and its further conversion to propionic and butyric acids was demonstrated at a carbon conversion rate of about 0.75.
After taking into consideration the influence of the pressure and carbon conversion ratio on the performance of the system, the gasifier and the combustor were synthetically studied.
To evaluate whether a stable BTF operation without clogging is possible, a novel process parameter (the rate of Carbon Conversion per unit void packing Volume) is introduced which possibilities and limitations are discussed.
碳转化率
carbon conversion
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