SU1196019A1 - Apparatus for percolation hydrolysis of plant raw material - Google Patents

Description

The invention relates to the hydrolysis industry and can be used in gidrolizapparata large unit capacity.

The purpose of the invention is to increase the rate of selection of the hydrolyzate and improve the washing of lignin.

FIG. 1 shows the device in the initial position; in fig. 2 - the same, in working condition; in fig. 3 - section A — A in FIG. 2

The device contains (Fig. 1) housing 1, pipe 2 for feeding, fitting 3, irrigation ring 4, perforated central supply pipe 5, filter cylinder 6, annular gap 7, hinged plates 8, perforated tubes 9, fitting 10, lignin discharge pipes 11, fittings 12 and 13 dispensing hydrolyzate. The filter cylinder 6 has perforations up to line 14 and connecting ports 15 for leveling the vapor pressure.

The device works as follows.

Raw materials loaded into the housing 1 through the pipe 2, fills the lower cone of the housing 1 and the internal cavity of the filter cylinder 6 (Fig. 1). The raw material does not fall into the annular gap 7, because the cylinder 6 is tightly connected to the housing 1 from above, and the annular gap 7 below overlaps the hinge plates 8, the lower ends of which fit the wall of the housing 1 and form a circular plate filter (FIG. 2, 3). The latter keeps the wood under the annular gap, but passes (filters) the liquid from the lower cone of the device into the annular gap. Plates 8, when loading raw materials, deviate from the vertical by an angle of 35-40 °, which increases the area of the circular filter compared to the width of the annular gap 7. After loading the raw material, the neck is closed and heating is started with live steam. Steam is supplied through perforated pipes 9 and the central pipe 5. When the specified temperature is reached, heating is stopped and the cooking acid is fed through the irrigation ring 4, the central supply pipe 5 and perforated pipes 9. From the feed sites this acid moves through the raw wood in three directions: from above down from the irrigation ring 4 through the upper layer of raw materials to the perforation boundary 14 with the subsequent transition to a horizontal movement to the annular gap 7; horizontally from the central supply pipe in radial directions to the circular filter cylinder 6; from the bottom up from the perforated tubes 9 to the circular plate filter and partially to the filter cylinder 6.

Such cross-movement of the cooking acid through the raw material allows

to carry out hydrolysis evenly and with greater completeness of the extraction of polysaccharides. The bulk of the hydrolyzate and wash water (up to 95%) is filtered through the filter cylinder 6. The upper part of cylinder 6 to a width of 5-6 m - to the border 14 (for the amount of raw material shrinkage) has no perforation. Through a circular plate filter filter selection is mainly from the lower cone of the housing.

Selected through the cylinder 6 and the circular plate filter hydrolyzate enters the annular gap 7, where through fittings 12 and 13 with adjustable speed is delivered to the collection collector hydrolyzate (not shown). After percolation, the lignin is washed with a hot lid, which is fed through the central tube 5 and perforated tubes 9. Wash water is removed in the same way as the hydrolyzate: through the filter cylinder 6 and the circular plate filter into the annular gap 7, and from there through fittings 12 and 13 in the collection collector. After washing, the free liquid from the lignin is squeezed out with steam, which is fed through the irrigation ring 4. The bulk of the pressed liquid is removed through the cylinder 6 and the annular gap 7.

On the lower conical part of the body, free lignin liquid is squeezed through tubes 9. The volume of this liquid is no more than 5% of the total spin, which reduces the load on the tubes 9 and reduces the likelihood of their clogging by lignin during the spin process. This makes it possible to produce stably lignin with a given humidity (up to 55%), which simplifies the ways of its further use as fuel or for other purposes with lower costs for drying. Lignin is unloaded from the device through the lower neck 11.

When the lignin is unloaded, the circular plate filter disintegrates, since the hinged plates 8 that make it up take the initial phase when the solid phase is removed - the vertical position, the annular gap 7 opens from the bottom and the slime settled in it during the cooking process is removed along with the lignin during the “shot”. The hydrolysis cooking cycle ends here.

During the whole process of hydrolysis cooking, the vapor pressure in the volume of the cylinder 6 in the annular gap 7 is the same, which is achieved by the presence of windows 15 in the upper part of the cylinder 6.

Increasing the filtration rate in the proposed device by 3-4 times makes the rate of release of the hydrolyzate and wash water at a non-limiting stage, which allows reducing the time of hydrolysis,

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1196019

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to increase the sugar yield per unit of spent raw materials, to improve the flushing of lignin from the catalyst and reaction products, and to significantly reduce the moisture content of this lignin by means of a more complete extraction of the liquid.

Phage. 2

Fig.Z

Claims (2)

DEVICE FOR PERCOLATING HYDROLYSIS OF PLANT RAW MATERIALS containing a cylindrical body with a lower cone part and branch pipes for feeding raw materials, a perforated feed pipe located along the axis of the cylindrical body, and a perforated filter, characterized in that, in order to increase the hydrolyzate selection speed and improve lignin washing, the filter is a cylinder mounted concentrically with a gap relative to the cylindrical part of the body, the lower edge of the cylinder is equipped with hinged plates, with the formation of an additional plate filter. FIG. one zi n ,, 1196019 2 one 1196019