Coal Gasifier/Gasification Power Plant

1. The working principle of coal gasification power plant

The basic chemical reaction of  coal gasification

 After the furnace gas is formed by vapor-air mixture flowing through the gasifying agent hot bed stationary combustion generated. The reaction of oxygen and carbon contained in the air and fuel vapor generated containing CO, CO2, H2, CH4 , C2H4, N2 and other components of the producer gas.

Steam with carbon reaction is endothermic:       C + H2O à CO + H2

oxygen and carbon reaction to release heat         2C + O2 à 2CO

Carbon monoxide react with steam:           CO + H2O à CO2 + H2

Here some of the steam also with CO reaction, because each time the volume of CO into CO2, while generating the same volume of H2.

In the reduced layer, will occur when the temperature is lower than 1200 ℃ rapid response below:

CO2 + C  à 2CO and  H2O +C à  H2 +CO

When the gas by reducing layers of combustible gas content rose rapidly, while CO2 and water vapor content decreased. By reducing zone, the part of the gas output, passing through the bottom of the cyclone and the air cooler, this part of the gas is called "bottom gas", around which a temperature of about 400-550 ℃.

In the distillation section, coal furnace was added, followed by drying, preheating and dry distillation, steam generation, tar fog and gas, together with the output from the top of the furnace, this part of the gas as "top gas", which at temperature of about 100-120 ℃.

2.Introduction of coal gaification process

The 30-60mm of bituminous coal by conveyor belt to a storage bunker, program-controlled coal equipment will be added to two coal dry distillation furnace section. Air blower blowing air into the bottom, while the low-pressure steam and air mixture through the mixing tank as a gasifying agent to the gasification section 1200 ℃ high temperature char gasification reaction of CO is about 31-33%, H2 of about 9 -10%, CH4 combustible gas is about 0.4-0.5%; while taking advantage of the lower calorie coal carbonization gas segment were carbonized, generating CO of about 29-31%, H2 of about 17-19%, CH4 about 1 -3%, CnHm about 0.2-0.4% of the combustible gases. The upper portion of the gas produced at a temperature of 100-120 ℃, after electric fishing catch coke dust and tar, then enter the intercooler cooling. From electric catching tar out of focus at the bottom of the tank was taken to focus. Gas produced by the lower gasification section whose temperature is about 550-600 ℃, after a cyclone to remove large particles of dust, and then, after phenol treatment system into the air cooler, cooling through the air cooler into the intercooler. On the lower section of the gas in the intercooler outlet are mixed after cooling

Gas temperature is about 35-45 ℃, through electric fishing is catching dust and gas oil, light oil, and then into the gas storage cabinet pressurized by the gas blower after desulfurization, and finally sent to the device through the gas pipeline with gas. From the intercooler and electric catching light out of light oil and phenol were fed water and phenol tar ponds pool light. Gas production program using cold gas production technology, process, see the process diagram

The 30-60mm of bituminous coal by conveyor belt to a storage bunker, program-controlled coal equipment will be added to two coal dry distillation furnace section. Air blower blowing air into the bottom, while the low-pressure steam and air mixture through the mixing tank as a gasifying agent to the gasification section 1200 ℃ high temperature char gasification reaction of CO is about 31-33%, H2 of about 9 -10%, CH4 combustible gas is about 0.4-0.5%; while taking advantage of the lower calorie coal carbonization gas segment were carbonized, generating CO of about 29-31%, H2 of about 17-19%, CH4 about 1 -3%, CnHm about 0.2-0.4% of the combustible gases. The upper portion of the gas produced at a temperature of 100-120 ℃, after electric fishing catch coke dust and tar, then enter the intercooler cooling. From electric catching tar out of focus at the bottom of the tank was taken to focus. Gas produced by the lower gasification section whose temperature is about 550-600 ℃, after a cyclone to remove large particles of dust, and then, after phenol treatment system into the air cooler, cooling through the air cooler into the intercooler. On the lower section of the gas in the intercooler outlet are mixed after cooling

Gas temperature of about 35-45 ℃, through electric fishing is catching dust and gas oil, light oil, and then into the gas storage cabinet pressurized by the gas blower after desulfurization, and finally sent to the device through the gas pipeline with gas. From the intercooler and electric catching light out of light oil and phenol were fed water and phenol tar ponds pool light. Gas production program using cold gas production technology, process, see the process diagram as below:

3.Raw coal quality requirements and gas quality for coal gasifier 

To ensure the quality furnace gas, and to meet the technological needs of the two-stage gas furnace gas, more coal is suitable for non-stick, weak caking bituminous coal, long flame coal, lignite old.

Specific indicators in the table below:

Cold gas content(%)

Gas quality indicators