JPS5912260B2 - Method for removing pest control agents from vegetable solids used in food - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for removing pest control agents such as insecticides and pesticides from solids used in food such as cereals, bran and peanut shells.

In particular, bran and peanut shells are added to livestock food as additive feed in agriculture.

As long as food demands are high, for example in the case of cattle feed, pesticides that remain in solid form are not tolerated.

The object of the present invention is to provide a method for reliably and easily removing pest control agents from solids.

This object is solved according to the invention by flowing a steam through the solid in a fluidized state at a temperature and moisture such that the pesticidal agent is evaporated from the solid and/or carried away by the steam stream.

A particularly advantageous method advances a solid in a fluidized state, with steam flowing through it in two adjoining zones in the direction of advancement, using gas and steam as carrier fluids in the first of the two zones, and The solid is heated by the vapor condensing into a solid, kept in suspension by the gas, and the vapor is used as a carrier fluid in the second zone.

Advantageously, at least a portion of the carrier fluid of the second zone is used cyclically.

Furthermore, it is advantageous if a part of the carrier fluid leaving the second zone is conducted into the first zone, with the part of the carrier fluid leaving the second zone forming the vapor part of the carrier fluid of the first zone.

Advantageously, the temperature and moisture content of the carrier fluid in the second zone is controlled such that the solids leaving the second zone have the desired moisture content.

All these measures are carried out particularly advantageously by generating the fluidized conditions by means of a horizontal fluidized bed device having at least a semi-horizontal bottom plate with passage holes for the carrier fluid and a supply box for the carrier fluid below the bottom plate. Can be done.

Next, the present invention will be explained with reference to the drawings.

The illustrated apparatus maintains the solids in a fluid state during steam processing.

For bringing the solid into a fluidized state, the device has a fluidized bed device 1;
The device comprises a horizontal bottom plate 3 with fluid passage holes 2 and a carrier fluid supply box 4 below the bottom plate 3.

The solids to be treated are fed into the fluidized bed apparatus 1 through an inlet chute 5, and by the action of the fluid exiting from the passage holes 2 a fluid 6 is formed on the bottom plate 3, where the fixings are kept in suspension, and an outlet chute 7 It leaves the fluidized bed apparatus 1 from.

Above the fluidized bed 6 is a suction hood 8 for the fluid leaving the fluidized bed.

Walls 9 and suction hood 8 arranged in supply box 4
The fluidized bed apparatus 1 is divided into two zones 11 and 12 one after the other in the direction of advancement of the solids by a wall 10 arranged at .

The first zone 11 of the two zones has a fluid introduction pipe 13 opening into the supply box 4 , and the second zone 12 has a fluid introduction pipe 14 opening into the supply box 4 .

From the first zone 11 there is a conduit 15 for the fluid leaving the suction hood 8, and from the second sea 712 there is a conduit 16 for the fluid leaving the suction hood 8.

An air pipe 17 and a steam pipe 18 open into the fluid introduction pipe 13 .

A blower 19 and a heater 20 are arranged in the fluid introduction pipe 13 .

The fluid outlet pipe 15 is equipped with a dust separator 21, the dust outlet pipe 22 of which opens into the inlet chute 5, and the fluid outlet pipe 15 is further provided with a fluid suction blower 23.

A dust separator 24 is provided in the fluid outlet pipe 16 of the second zone 12.
is provided, and its dust outlet pipe 25 opens to the outlet chute 7.

The fluid outlet conduit 16 opens into the fluid inlet conduit 14, which conduit is equipped with a compressor 26 and a heater 27.

A steam pipe 28 opens into the fluid outlet pipe 16 .

A steam pipe 18 branches from the fluid introduction pipe 14 .

The method of removing pest control agents, such as insecticides and pesticides, from vegetable solids used in food, such as cereals, bran, peanut shells, in the illustrated apparatus is carried out as follows: in a fluidized bed apparatus 1, the solids are passed through the The biocontrol agent is evaporated from the solid and/or a vapor is introduced having a temperature and moisture that is carried away by the vapor stream.

In this case, the solids are kept in a fluidized state in the fluidized bed 6 of the fluidized bed apparatus 1 during the steam treatment.

The solids advance in a fluidized state in the fluidized bed 6 and are passed through by steam in two zones 11 and 12 one behind the other in the direction of solids advancement.

The carrier fluids in the first zone 11 are gas and vapor, and the solids are heated by the vapor which condenses into solids and are kept suspended by the gas.

The carrier fluid in second zone 12 is steam.

Heating of the solid in fluidized state in the fluidized bed 6 by vapor condensation allows a very rapid, precise and uniformly distributed heating of all particles of the solid.

After this heating in the first zone 11, the next second zone 12
The steam treatment within the fluidized bed 6 also results in uniform distribution over all particles of the solid due to the fluidized state of the solid within the fluidized bed 6.

It ensures uniform treatment of all solid particles, resulting in lower steam consumption and shorter processing times.

The majority of the carrier fluid in second zone 12 is conducted cyclically by conduits 16 and 14.

The stream of fluid leaving the second zone 12 through the fluid outlet pipe 16 is taken out of the circuit and sent to the first zone 11 by the steam pipe 18.

The portion of the second zone 12 branching off from the carrier fluid is
A vapor portion of the carrier fluid of the first zone 11 is formed within the zone 11 .

Thereby the device has one steam inlet or steam pipe 28
and only one vapor outlet or fluid outlet tube 15 is required.

Very little steam exits the device.

This amount must of course be large enough to entrain all of the pest control agent to be removed.

Despite the effective removal of pest control agents, the device operates very economically.

The ideas and embodiments of the present invention are listed below: 1) A method for removing pest control agents, such as insecticides and pesticides, from vegetable solids used in food, such as grains, bran, and peanut shells. removing pest control agents from vegetable solids for use in foodstuffs, characterized in that a vapor having a temperature and moisture is passed through the solids in a fluid state to evaporate the agent from the solids and/or to carry them away by a vapor stream; Method.

2) The solid is moved forward in a fluid state, with steam flowing through it in two zones one after the other in the direction of advancement, and gas and steam are used as carrier fluids in the first of the two zones, with the solid being 2. The method of claim 1, wherein the steam is heated by condensing into a solid, kept in suspension by the gas, and the steam is used as the carrier fluid in the second zone.

3) The method of item 2 above, wherein at least a portion of the carrier fluid in the second zone is guided cyclically.

4) The method of item 2 above, in which a portion of the carrier fluid leaving the second zone is directed into the first zone.

5) The method of paragraph 4, wherein a portion of the carrier fluid leaving the second zone forms the vapor portion of the carrier fluid of the first zone.

6) The method of item 2 above, wherein the temperature and moisture content of the carrier fluid in the second zone is controlled such that the solids leaving the second zone have a desired moisture content.

7) The method of claim 1, wherein the fluidized conditions are generated by a horizontal fluidized bed apparatus having at least a substantially horizontal bottom plate with passage holes for the carrier fluid and a supply box for the carrier fluid below the bottom plate.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view of a fluidized bed apparatus implementing the method of the invention. 1...Fluidized bed device, 3...Bottom plate, 5.
...Inlet chute, 6...Fluidized bed, 7.
...Exit chute, 11...First zone, 12...Second zone, 17...Air pipe, 28...Steam pipe.

Claims (1)

[Claims] 1. The temperature at which the pest control agent is evaporated from the solid and carried away by the vapor stream in a process for removing pest control agents, such as insecticides and pesticides, from vegetable solids used in food, such as cereals, bran, and the shells of fallen plants. and steam containing water, flowing through the solid in a fluidized state,
The food product is characterized in that the fluidized state is generated by at least one horizontal fluidized bed device having an at least approximately horizontal bottom plate with passage holes for a carrier fluid reservoir and a supply box for the carrier fluid below the bottom plate. A method of removing pest control agents from the vegetable solids used.