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Main Working Process of Sludge Pyrolysis Gasifier Plant

Oil sludge graded pyrolysis and gasification technology is based on circulating fluidized bed technology as the core, coupling high-temperature hydrogen rapid pyrolysis of oil sludge, gas-phase tar and oil and gas hydrogen cracking, and semi-coke gasification, and is equipped with an efficient separation and return system and gas waste heat recovery. Purification system, etc., produces high calorific value clean gas, and the by-product slag can be used as building materials or cement raw materials to avoid secondary pollution of traditional sludge treatment, while adapting to technical difficulties such as high water content of raw materials and large differences in specific gravity.

The combustible gases produced by high-temperature pyrolysis and gasification of organic solid waste are mainly CH4, CO and H2. The high temperature pyrolysis gasification process is as follows:

• 1. Step one:

  After drying, the organic solid waste is added to the high-temperature pyrolysis gasification furnace from the top of the furnace. During the descending process, it comes into contact with the retort gas at a temperature of 80-200°C, and continuously removes the attached water. The water turns into steam and the retort gas together. After being discharged from the furnace, the organic solid waste gradually becomes dry.

• 2. Step two:

  The dried organic solid waste undergoes a carbonization reaction under the baking of hot gas with a temperature of 200 to 900°C raised from part of the reaction layer, generating combustible gases such as alkanes (CmHn) and water vapor (H2O). All of the above The gas is discharged from the upper part of the furnace body together.

• 3. Step three:

  The main residues of organic solid waste after carbonization are non-combustibles such as coke and a small amount of clay. At a high temperature of 900-1100°C, an oxidation-reduction reaction occurs through the action of water vapor to produce carbon monoxide (CO), hydrogen (H2), etc. Combustible gas is discharged from the middle of the furnace body. The main reactions are as follows:

  C + O2 = CO2 + 408840kJ/kmol C + 1/2O2 = CO + 123217 kJ/kmol

  CO2 + C = 2CO - 162405 kJ/kmol C + H2O = CO + H2 - 118821 kJ/kmol

  C + 2H2O = CO2 + 2H2 - 75237 kJ/kmol

• 4. Step four:

  The organic solid waste gasification is completed and turned into inorganic slag, which is discharged from the bottom of the reactor through a special slag discharging mechanism.