Method for preparing active carbon by using multi-hearth furnace

Abstract

The invention relates to a method for preparing active carbon by using a multi-hearth furnace. The method comprises the following steps: 1) inputting a raw material from the feeding end on the top of the multi-hearth furnace into the multi-hearth furnace; 2) starting a combustor in the bottom of the multi-hearth furnace to heat the raw material, wherein the temperature of the raw material in the furnace layer in the bottom of the multi-hearth furnace is raised to be not less than 600 DEG C in the first place to reach an activating temperature; 3) introducing water vapor into the multi-hearth furnace, wherein the raw material reaching the activating temperature and water vapor which are overturned by virtue of a rabble blade are uniformly contacted to carry out gas-solid heterogeneous activating reaction to generate combustible gases H2 and CO; 4) generating a negative pressure by using an induced draft fan to control the flowing directions of H2 and CO, wherein the H2 and CO move upward from the bottom of the multi-hearth furnace; 5) injecting air into the multi-hearth furnace, wherein exothermic reaction is carried out on H2 and CO and oxygen in air, and released heat is taken as heat required for carrying out gas-solid heterogeneous activating reaction on the raw material and water vapor; and 6) forming active carbon after activating reaction of the raw material, wherein the active carbon is discharged from a discharge opening in the bottom of the multi-hearth furnace. The method provided by the invention can be widely applied to processes for preparing active carbon.

Description

technical field [0001] The invention relates to a method for preparing activated carbon, in particular to a method for preparing activated carbon by using a multi-hearth furnace. Background technique [0002] Activated carbon is a kind of artificial carbon material product with developed pore structure and large specific surface area. It is mainly used for the adsorption and separation of gases, and the purification of drinking water. It has been widely used in the fields of chemical industry, food, medicine and environmental protection. Applications, especially in the field of environmental protection, activated carbon products have a huge market capacity. [0003] At present, my country's environmental protection situation is becoming more and more serious. From the smog that plagues my country's major urban circles to the disorderly discharge of industrial sewage and the continuous decline in drinking quality, it all involves flue gas purification, air filtration, industr...

AI Technical Summary

Problems solved by technology

At present, in order to maintain the reaction temperature in the furnace, it is necessary to turn on a large number of burners in the furnace to maintain the furnace temperature, which will cause fluctuations in the furnace temperature in the furnace and have a great impact on the quality of activated carbon produced; more importantly, the production process increases Fuel consumption, while increasing exhaust gas emissions, neither energy saving nor environmental protection

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