There are many methods to produce coal gas, such as coke oven gas, coal producer gas, semi-coke gas, water coal gas, oil coal gas, blast-furnace gas and cracking coal gas etc. The main compositions are Carbon monoxide (CO), Hydrogen (H2), Oxygen (O2), Nitrogen (N2), Carbon dioxide (CO2) etc.

Coke oven gas generator set

The producing method of coke oven gas is as below mentioned: raw coal id crushed and washed and washed, after that different coal will be mixed together with different ratio and put into furnace, and then it will produce coal gas and coal tar with high temperature hydrolysis in air-free condition.

Gas composition of Coke Oven Gas

Remark: 

After through conventional cooling, desulfurization, de-tar and de-hydration treatments, coke oven gas will generate power with internal-combustion generator. The power will be as self-provided power for coke oven factory and can be connected to national grid, which avoid coal gas emptying.

Application Place:

The genset is for steel plant and coke-oven plant.

Coal gas generator set 

The producing method of coal producer gas is as below mentioned: after lighting the coal, a great amount of CO is produced with in combustion by limiting air in the bottom of furnace. The main compositions are CO, CO2 and N2.

The producing method of water coal gas is as below mentioned: after lighting the coal, make coal burn completely by blowing enough air from the bottom of furnace, and then stop blower and inject water vapor from the bottom and the top of furnace, a great amount oh H2, and CO are produced when the water vapor combines with hot coal, and then it forms water coal gas when mixing with N2 in the air and the left water vapor.

Semi-coke gas generator set 

Semi-coke is made from smokeless coal in low temperature and dry distillation kiln, its technology is similar to coal gas gasifies; just the output product is different with different heating temperature. In the producing process of Semi-coke, a great amount of exhaust gas is produced, its main contents is CO. About 600-700M3 semi-coke gas is produced from 1T semi-coke in low temperature and dry distillation kiln, and the heat value of coal gas is about 1900kcal, which can meet the requirement of generating power.

The main composition of coal gas which produced by current internal heating type of semi-coke furnace is N2 (about 50%), others are H2, CO, CO2 and CH4. Because there are many useless composition in semi-coke gas, and the heat value is low (1800—2000kcal), all these limit its range of application and a great quantity of semi-coke gas are evacuated or burned.

Gas compositions of current internal heating type of semi-coke furnaces are as below:

Requirements for coal gas genset(Within 1m from gas intake value)

Coal gas temperature ≤40℃

Pressure 3 ~ 20kpa, Pressure changing rates ≤1 kpa/min

H2S≤200mg/Nm3;

NH3≤20mg/Nm3;

Tar content≤50mg/Nm3;

Impurity Particle size≤5μm, impurity content ≤30mg/Nm3

Moisture content≤40g/Nm3

Gas heat value≥4.2MJ/ Nm3;

If fuel gas contains higher quantity of sulfur and ammonia, it not only corrodes the pole of spark plug seriously, but also increases the acid value, which corrodes internal parts of genset and corrodes the genset with precipitates.