The method of carbonization of wood pulp

 

(57) Abstract:

The method of carbonization of wood pulp relates to the production of active carbon and organic products from carbonaceous raw materials and can be used in the woodworking industry for disposal of wood waste. The method of carbonization of wood pulp includes its heat treatment in oxygen-depleted atmosphere, what's new is that thermal treatment is carried out in the antinodes of the standing wave of the microwave electromagnetic field when the value of the summed specific microwave power for at least 2 watts/cm3and oxygen-depleted atmosphere is created by the flow of one or more non-supportive combustion gases, consumption of which is not less than 0.1 l/min. Free combustion gases selected from a number of: nitrogen, carbon dioxide, argon, helium and other inert gases. The invention solves the problem of creating a single-stage continuous, more environmentally friendly by eliminating the introduction of an additional reactive additives method of carbonization of wood pulp. 1 C.p. f-crystals.

The invention relates to the production of active carbon and organic products from carbonaceous raw materials and can be used in the reading processing of carbon-containing raw material in the apparatus for active coal in the fluidized bed, includes pre-heating the raw material at a temperature of 100-150oWith low-temperature carbonization at a temperature of 400 to 500oWith high-temperature carbonization at a temperature of 750-850oWith and activation of the solid product of the carbonization gas-vapor mixture (USSR Author's certificate 467761, From 01 To 31/08, 1972).

The disadvantage of this method is the complex technology of the process, high energy density, relatively high temperature.

The known method of carbonization of wood pulp, which consists in mixing with the reaction additives, pre-heating of raw materials to a temperature of 150-200oWith the removal of the resulting resinous product and vaderlandsche condensate and thermochemical decomposition at a temperature of 600-700oC in oxygen-depleted atmosphere (RF Patent 2174098, From 01 To 31/08. Publ. 2001.09.27). However, this method, allowing to obtain high quality active carbon, is a multistage requires additional chemicals and leads to additional environmental pollution by products of thermochemical processes.

The present invention solves the problem of creating one continuous, ecologicas is Itachi wood pulp.

This object is achieved in that in the method of carbonization of wood pulp, including its heat treatment in oxygen-depleted atmosphere, what's new is that thermal treatment is carried out in the antinodes of the standing wave of the microwave electromagnetic field when the value of deciding on a specific microwave power for at least 2 watts/cm3and oxygen-depleted atmosphere is created by the flow of one or more does not support combustion gases, consumption of which is not less than 0.1 l/min

Does not support combustion gases selected from a number of: nitrogen, carbon dioxide, argon, helium and other inert gases. The most sophisticated economic considerations are nitrogen and carbon dioxide as the inert gases are more expensive and their consumption because of the greater volatility above.

The flow of inert gas is determined by the resistance zone of carbonization (newsplease) wood pulp in the microwave field.

Implemented method as follows: the electromagnetic energy of the microwave field from the microwave source in a rectangular waveguide is fed into the zone of intersection of the flow of pulp through the pipe from transparent to microwave field of the material (for example, quartz glass, paligorova ceramics and so on). In the area Perez is th standing wave of the microwave field, where is the carbonization process in oxygen-depleted atmosphere by supplying this area with any perspective combustion inert gas.

To protect the microwave generator from the reflected wave between the microwave generator and the zone of carbonization is advisable to install the appropriate security device (circulator, dual slotted bridge, etc).

Continuous carbonization process is determined by the continuity of the movement of wood pulp.

For condensate and gas tar substances in the pipe in which it is moving wood pulp, are special channels.

Example 1

Conducted carbonization of sawdust and shavings (after electric fuganka) in the electromagnetic microwave field frequency of 2.45 Hz, adding to the atmosphere of the working chamber nitrogen. The summed value of microwave power was 600 W. With short piston mounted on the end of the rectangular waveguide tract (size 9045 mm) in the zone of intersection of the flow of wood pulp (diameter 80 mm) with the electromagnetic field is set to the maximum (antinode).

The nitrogen flow rate was 0.1 l/min

The time of passage of the pulp zone abrabo, that in example 1. Just as wood pulp took sawdust mixed with the shavings in the ratio of 1:1 by volume. As the inert combustion gas filed carbon dioxide. The summed value of microwave power was 600 W, the processing time wood pulp was 2.4 minutes

In the wood pulp turned into charcoal.

Example 3

Same as in example 2. Only as inert combustion gas filed argon in a quantity of 0.2 l/min. Value summed up the microwave power was 600 W, the processing time wood pulp was 3 minutes

In the wood pulp turned into charcoal.

Example 4. Same as in example 1. Just as wood pulp took sawdust mixed with the shavings in the ratio of 1:2 by volume. As the inert combustion gas was applied to the xenon in the amount of 0.15 l/min, the summed Value of microwave power was 600 W, the processing time wood pulp was 2 minutes

In the wood pulp turned into charcoal.

Example 5. Same as in example 1. Just as wood pulp took sawdust mixed with the shavings in the ratio 2:1 by volume. As inert the time of processing wood pulp was 3.5 minutes

In the wood pulp turned into charcoal.

Example 6. Same as in example 1. Just as wood pulp took sawdust mixed with the shavings in the ratio of 1:3 by volume. As the inert combustion gas filed helium in the amount of 0.3 l/min. Value summed up the microwave power was 600 W, the processing time wood pulp was 4 minutes

In the wood pulp turned into charcoal.

Thus, the proposed method allows you to create a one-step, continuous, more environmentally friendly by eliminating the introduction of an additional reactive additive process.

1. The method of carbonization of wood pulp, including its heat treatment in oxygen-depleted atmosphere, wherein the heat treatment is carried out in the antinodes of the standing wave of the microwave electromagnetic field when the value of the summed specific microwave power for at least 2 watts/cm3and oxygen-depleted atmosphere is created by the flow of one or more non-supportive combustion gases, consumption of which is not less than 0.1 l/min

2. The method according to p. 1, characterized in that the free combustion gases viber

 

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