SU1211362A1 - Installation for continuous digesting of cellulose-containing material - Google Patents

Description

The invention relates to pulp and paper production and can be used for pulping, hemicellulose, high yield pulp, as well as in hydrolysis production for acid hydrolysis of plant raw materials.

The purpose of the invention is to improve the processing conditions of the material at the expense of. enable the creation of a stepped increase in pressure in the pipes; Ax-,.

FIG. 1 shows the installation of non-stop cooking; in fig. 2 - pipe with a device for - loading (unloading); in fig. 3 shows section A-A in FIG. 2, condition for loading (unloading); in fig. A - view B in FIG. 2, a device nozzle for loading (unloading); in fig. 5 shows a section B-B in FIG. 3, a device for loading (unloading).

The installation for the continuous cooking of a material containing de-pulp includes a pipe system with conveying shafts 1 mounted one above the other and interconnected by devices for loading 2 and unloading 3 material flows. Each of the devices for loading and unloading consists of a system of screws 4 having a cylindrical section 5 passing into a section 6 of conical shape and a separator flow 7, with the axis of the screws mounted between them at an acute angle, the apex oriented towards the direction of flow. , and the outer surfaces of the screws form between them a wedge-shaped section 8, in which the separator-7 is mounted.

The installation also includes a hopper 9, and the pipe system consists of a steam 10, an impregnation 11 and cooking pipes 12. In the pipe housings with a loading patrub 13 and face 14 on the shafts 1 turns 15 of screw conveyors 16 are mounted. The pipe bodies are connected detachably through the end the flanges 17 with the housing of the discharging device 3 or the loading device 2. A cast gear case 18 is mounted in the case. In the section of shaft 1 passing through the wedge shaped projection 7 of the cast cone gear 18, a bevel gear 19 is mounted, and at the exit point

1211362 .2

 shaft 1 of cast gear case detachably mounted Krishka 20.

The installation works as follows.

5 Fibrous material from the hopper 9 through the nozzle 13 is loaded into the casing of the steam chamber 10, where it is subjected to heat treatment with continuous transport of coil 0 and 15 of the screw conveyor 16 to the device for loading 2 (into the impregnation pipe 11). The flow divider 7 of the cast housing of the gearbox 18 fibrous material is divided into

15 two streams are captured by the cylindrical sections 5 and fed to the conical sections of the 6th screw 4. Forced unloading of the fibrous material from the steaming chamber and transferring the load into the impregnating chamber is accompanied by compressing the material in the working zone of the conical sections 6. The pre-compressed fiber of the impregnating pipe 1I the material is fed to the impregnation. Forced material loading with pre-compression provides an increase in the fill ratio of pipes to 0.7-0.8. In theory

 under such loading conditions, the filling ratio may be 0.9-1.0, but in the impregnating pipe 11, in addition to the fibrous material, a delignification liquid is fed,

35 which, depending on the size, the hydromodule occupies a part of the useful volume. The load factor in the impregnation tube 11 can be adjusted by changing

40 frequency of rotation of the shaft 1 and the screws 4. With an increase in the frequency of rotation of the above shaft and augers and a constant frequency of rotation of the shaft, the load density factor is impregnated.

45th pipe increases.

Precompression of the fibrous material in the device for load 2 before being fed into the loading port 13 of the impregnation pipe ensures that the pressure can rise from atmospheric pressure, during which thermal treatment is carried out in the steaming pipe 10, to 0.3-0.4 MPa in the impregnating pipe 1I without installing a low pressure feeder. Transportation of the material in the impregnation pipe 11, unloading using the unloading device 3 and loading into

the cooking tube 12 is carried out similarly. Compression of the fibrous material improves the impregnation conditions, while it is possible to increase the pressure in the upper cooking tube to 0.8-1.3 MPa without installing a high pressure feeder.

The material is transported in the brewing pipe 12, the loading by means of the device 2 into the brewing pipe located below is also carried out in the same way, without changing the frequency of rotation of the shafts of the impregnating pipe 1I

2113624

and the cooking tube 12. Compressing the fibrous material in the loading device 2 and unloading device 3, which are connected to 5 cooking pipes 12 through end flanges 17, makes it possible to incrementally increase the pressure in the cooking pipes, which improves the conditions of chemical heat treatment. In this case, the maximum working pressure will be in the bottom of the cooking tube. Unloading is carried out continuously. receptacle, vessel, receptacle, etc.

13

/four

ff

4

Claims (1)

INSTALLATION FOR CONTINUOUS COOKING OF THE CELL-CONTAINING MATERIAL, including a system of pipes with conveyor shafts mounted one above the other and connected in series with each other for loading and unloading the material flow, characterized in that, in order to improve the processing conditions of the material by providing the possibility of creating a stepped increase pressure in the pipes, each device for loading and unloading consists of a system of plugs having a cylindrical section turning into a section of a conical shape and a flow separator, and the screw axes are mounted at an acute angle with the apex oriented in the direction of the flow direction, and the outer surfaces of the screws form a wedge-shaped section between them, in which the flow separator is mounted.