Two Stage Gas Generator Cold Gas Station

Two-stage gas generator cold gas station refers to the reaction furnace used to make gas. The gas produced by the cold gas station of the two-stage gas generator is divided into upper-stage gas and lower-stage gas. It is mainly used for heating industrial furnaces, such as forging heating furnaces and heat treatment furnaces in the machinery industry; melting pools in the glass industry; tunnel kilns in the grinding wheel and refractory industries.

The gas produced in the gasifier is generated by mixing steam and air to form a gasifying agent, which then flows through the hot fixed combustion bed. The oxygen and steam in the air react with the carbon in the fuel to produce gas, which contains CO, CO2, H2, CH4, C2H4, N2, and other components. Among them, CO, H2, CH4, C2H4 are combustible gases. The lower heating value is calculated by the following formula: Q_l＝30.5 CO^w +25.8H^w₂+85.9CH^w₄+143C₂H^w₄+55.2H₂S^w kcal/Nm³或 Q_l＝128 CO^w+108H^w₂+360CH^w₄+599C₂H^w₄+231H₂S^w kJ/Nm³

Where ：CO^w,H^w₂,… represent the absolute values of the percentage content of each component in 100 Nm3 fuel.

30.5,25.8/,… …It is the combustion heat of each component gas 1/100 Nm3.

The reaction of steam with carbon is endothermic: C + H2O CO + H2

When oxygen and carbon react, heat is released 2C + O2 2CO

Carbon monoxide reacts with steam: CO + H2O CO2 + H2

Here some of the steam also reacts with CO, since for every volume of CO converted to CO2, the same volume of H2 is simultaneously produced. In the reduction layer, when the temperature is lower than 1200 ° C, the following rapid reactions will occur:

CO2 + C 2CO and H2O + C H2 + CO

When the gas passes through the reducing layer, the content of combustible gas increases rapidly, while the content of CO2 and water vapor decreases. After passing through the reduction zone, part of the gas is exported and flows through the bottom cyclone dust collector. This part of the gas is called "bottom gas", and its temperature is about 500~600°C.

In the dry distillation section, the coal added to the gasifier is dried, preheated, and dry distilled in sequence, and the generated steam, tar mist, and gas are output from the top of the gasifier together. This part of the gas is called "top gas," and its temperature is about 120-150℃. Refer to the figure below for details.

The 30-60mm bituminous coal is conveyed to the coal storage bin by electric lifting equipment. The coal feeder, controlled by a program, adds coal to the dry distillation section of the two-stage furnace. The air blower injects air into the bottom of the furnace, while low-pressure steam is mixed with air through a mixer as a gasifying agent to react with the semi-coke coal in the gasification section at a high temperature of 1200℃, generating combustible gas with CO of about 31-33%, H2 of about 9-10%, and CH4 of about 0.4-0.5%. Meanwhile, the lower stage gas is used to dry distill the coal in the dry distillation section, generating combustible gas with CO of about 29-31%, H2 of about 17-19%, CH4 of about 1-3%, CnHm of about 0.2-0.4%. The composition of the mixed gas is about CO 26-30%, H2 10-15%, CO2 4-5%, N2 45-50%, CH4 2-3%, O2 0.2-0.6%. The temperature of the upper gas is 80-150℃. After electrostatic precipitation, coke capturing, and dust removal, it enters the gas main. The coke oil from the bottom of the electrostatic precipitator is sent to the tar pool. The temperature of the gas produced by the lower gasification section is about 450-550℃. After being purified by a cyclone dust collector to remove large particle dust, it directly enters the gas station mainline to mix with the upper gas. Finally, the gas is sent to the gas equipment through the gas pipeline.

Hot Tags: two stage gas generator cold gas station, China two stage gas generator cold gas station manufacturers, suppliers, factory, One Stage Coal Gasifier, plenum heat exchanger, armstrong plate heat exchanger, Gasifier Accessories, Biomass Gasifier, Coal Gasifier