Method for preparation of active carbon by pyrolysis of organics

Abstract

A method of production of active carbon by pyrolysis of organic materials, includes pyrolysis unit, reforming unit, drying unit, purification unit, gas storage unit and high temperature regenerative combustion unit. Organic materials are subjected to pyrolysis reaction in pyrolysis unit to produce combustible gas, tar and char. Combustible gas is reformed through reforming unit then enters into the drying unit for drying organic materials. One part of the purified combustible gas is combusted in the direction of combustion channel in the high temperature regenerative combustion unit, and the combustion heat is produced. At the same time, another part of combustible gas exchanges heat in the direction of heat exchanger channel in the regenerative combustion unit. Then it is used as pyrolysis activation medium entering into the pyrolysis unit in process of pyrolysis and activation reaction. The char is activated by the combustible gas in the pyrolysis unit then forms activated carbon. The sensible heat of the combustible pyrolysis gas is fully released through drying unit. A part of the combustible gas is combusted to produce heat as the required energy source of pyrolysis process. The combustible gas is used as pyrolysis medium and activator in the generation process of active carbon.

Claims

1. A production method of producing activated carbon from wet organic materials comprising a pyrolysis unit, high temperature separating unit, reforming unit, heat transfer drying unit, purification unit, gas storage unit and high temperature regenerative combustion unit, comprising of the following the steps: Step 1: drying the wet organic materials in heat transfer drying unit to produce a dried organic material; Step 2: placing the dried organic materials into the pyrolysis unit for thermal decomposition to produce a combustible gas, tars and chars; Step 3: passing the combustible gas and tar through a high temperature separating unit followed by a high temperature dust removal unit, and passing the output from the high temperature dust removal unit for partial combustion and reforming by contact with a catalyst to produce a partially combusted combustible gas wherein the tar is cracked; Step 4: drying and cooling via heat transfer drying unit the partially combusted combustible gas to produce a cooled combustible gas and recycling remaining heat; Step 5: purifying the cooled combustible gas and passing it into a gas storage unit, wherein the cooled combustible gas is divided into two parts, wherein one part is combusted with air in a high temperature regenerative combustion unit to produce a combusted tail gas which is discharged after heat exchange in air preheating unit and at the same time air is preheated for combustion process and the other part of the cooled combustible gas is heated by combusting the above part of cooled combustible gas in the regenerative combustion unit to produce a high temperature combustible gas; and Step 6: passing the high temperature combustible gas into the pyrolysis unit of step 2 to provide heat for pyrolysis reaction and simultaneously activate the chars to produce an activated carbon.

2. The production method according to claim 1, wherein the pyrolysis unit is selected from the group consisting of fluidized bed, boiling bed, circulating fluidized bed or fixed bed reactor.

3. The production method according to claim 1, wherein the reforming unit is a high temperature reforming unit.

4. The production method according to claim 1, wherein the temperature of the reforming unit is 800-900 C.

5. The production method according to claim 1, wherein the air temperature after preheating in step 5 is 150-200 C.

6. The production method according to claim 1, wherein the operating temperature of the high temperature regenerative combustion unit in step 5 is 800-900 C.

Description

ATTACHED FIGURE SHOWS

(1) The FIGURE is schematic diagram of the system of active carbon production by pyrolysis of organic materials

THE SPECIFIC WAY OF IMPLEMENTING

(2) The following graph is the detailed declaration for the specific way of implementing this invention

(3) The FIGURE shows the layout of the system of production of active carbon by organic materials pyrolysis. As shown in The FIGURE, organic materials are used as raw materials and pyrolyzed in the pyrolysis unit, then combustible gas and chars are produced. The combustible gas goes through the high temperature separating unit and high dust removal unit, and then enters into the reforming unit for reforming reaction. The tars in the combustible gas are cracked and the heat value of combustible gas is improved.

(4) The hot combustible gas goes through an organic materials drying unit. Wet organic materials are dried by absorbing the sensible heat of combustible gases, after drying, the organic materials are used as pyrolysis feedstock and enter into the pyrolysis unit. High regenerative combustion unit has two channels, one is the combustion channel, and another is heat exchanger channel. The combustible gas goes through the purification unit and enters into the gas storage unit. Two pipelines are led out from the gas storage unit. One is connected with the combustion channel of the high temperature regenerative combustion unit, and another is connected with the heat exchange channel. Combustible gas is burned in the combustion channel. The temperature of regenerator increases, and the produced gas preheats cold air by an air heat exchanger. The preheated air enters into the regenerative combustor and then is uses as oxidant in the combustion reaction. Meanwhile, the combustible gas from the gas storage unit in another channel goes through the heat exchange channel and is heated to hot gas. These high-temperature combustible gases are used as a medium and enter into the pyrolysis unit to provide heat for the pyrolysis reaction, and it is also used as activator for the activation of the char produced in pyrolysis, thereby char is converted to activated carbon.