FI64820B - OVER ANCHORING FOR OVER OEORFOERING AV VARMSLIPMASSA FRAON SEPARATIONSKAMMARE TILL BEHAOLLARE - Google Patents

Description

1 64820

FIELD OF THE INVENTION between the separation space and the mixing chamber by means of pump-like means, such as rotors or a combination of screw and rotors or a plug-screw, .

The steam leaving the mills with the pulp has been used in systems built up to date, mainly only to transport the pulp from the mills to the pulp tank.

In other words, the pressurized steam escaping from the refiners with the pulp, together with the pulp, is led via a pipeline directly to a non-material pulp tank.

It is only in the pulp tank or in the cyclone built in connection with the tank that the mass and steam are separated.

The steam from the rotary cyclone and / or the pulp tank is then at normal pressure or only slightly on the overpressure side.

As a result of the pressure drop, the availability of steam (1st value) in terms of heat recovery has decreased substantially compared to the situation where steam can be led to heat recovery directly at the pressure prevailing with the refiners.

Various steam and pulp separation equipment under grinding agent have been tried with varying success.

55 The difficulty in the equipment is not so much the separation of steam and mass, but the transfer of a mass containing about 30 ... ^ 0% dry matter from a pressurized state to a non-pressurized state so that the steam is not released with the mass at the same time, but can be led directly. at the pressure prevailing in the separation space for utilization in heat recovery.

5 Due to the high dry matter content, such a pulp mass can only be transferred by different conveyors and keys, which in turn set their own limits, e.g. equipment in relation to each other.

The apparatus which is the subject of the invention offers a significant advantage in this respect as well, it does not place restrictions on, for example, the location of the pulp tank with respect to the pulp discharge apparatus.

The process according to the invention is mainly characterized in that the pulp in the mixing chamber is diluted to a consistency which allows the pulp to be transferred or subsequently pumped along the pipelines, taking place using substantially the dilution water pressure of the pulp.

The characteristic features of the apparatus according to the invention become clear from claim 5.

The invention will now be described by way of two examples with reference to the accompanying drawings 1 and 2, which show some embodiments of the invention.

The pulp and steam discharged from the refiner or refineries are passed to a cyclone 1, which acts as a separation space, where 25 pulp and steam are separated. The pulp settles down and the steam is led through the center tube of the cyclone 1 to the heat recovery equipment.

The discharge device 2 in the example of Fig. 1 consists of a constant volume thickener pump 2 of a structure known per se, fixed to the cone 30 at the lower end of the cyclone 1, and a mixing chamber 3 immediately connected thereto.

The pulp pump 2 consists of a feed screw and two rotors 5 and 3 rotating synchronously with respect to each other.

• ‘night screw H feeds the pulp rotor L1’ 5 and 5, 3 64820 which, as they rotate, transfer the pulp to the mixing chamber 3 Constants like a joy pump.

In the mixing chamber 3, the pulp is diluted with water passed through the nozzles 7 to a consistency which allows the pulp 5 to be transferred from the mixing chamber 3 to the pulp tank 8 via the piping 9.

The feed screw 4 and the rotors 5 and 6 have their own drive equipment, which allows their rotational speeds to be adjusted independently of each other to suit their operation.

In order to prevent the pulp from vaulting in the cyclone 1, it is advantageous to use the discharge device 2 at such a high speed that the cyclone remains empty of the pulp.

In order to prevent the pulp from vaulting and / or to transfer the pulp to the discharge equipment 2, a separate agitator or vibrator equipment can be used in the pulp and steam separation space, in particular when the separation space is other than a cyclone.

The fact that the rotors 5 and 6, when partially or empty when running, also transfer steam to the mixing chamber 3 20 is not essential for the whole and the steam condenses as soon as it enters the mixing chamber 3.

In the mixing chamber 3, the mixing of the pulp and water can be intensified, if necessary, e.g. with mechanical mixers.

Since the mixing temperature of the pulp and water can be determined quite easily, e.g. by calculation, the appropriate amount of dilution water in the mixing chamber 3 can be adjusted, e.g. by means of this temperature.

By means of the valve 10 in the pipeline 9, it is possible to adjust the pressure in the mixing chamber 3 to suit the operation 30. The pulp pump 2 only acts as a shut-off and transfer device between the cyclone 1 and the mixing chamber 3.

Figure 2 shows a discharge device in which a pulp pump 2 of the type described in the previous example has also been replaced by a plug-35 screw 11 of a structure known per se.

The plug screw 11 consists of a conical screw 12 and a cone 13 acting as a closing and retaining device.

The screw 11 feeds the pulp from the cyclone 1 against the cone 13 closing the opening 14, which opens as the pressure of the pulp against it increases sufficiently.

5 The mass pressed against the cone 13 forms a tight plug between it and the screw 12. Unloaded, e.g. at the end of the mass input, the cone 13 keeps the opening 14 tightly closed.

Claims (3)

64820 1. An airfoil for transferring hot-milled pulp from a pressurized, pulverized-pulp-steam separation space to a substantially lower pressure, preferably non-pressurized between the separation space (1) and the clarification chamber (3), a sufficiently tight closure is formed as a discharge device by means acting as a pump, such as rotors (5 and 6) or a combination of screw (4) and rotors (5 and 6) or plug screw (11) to prevent pressure Irrespective of the differences, leakage flows past the barrier point, characterized in that the pulp in the mixing chamber (3) is diluted to a consistency that allows the mass to be transferred or subsequently pumped along the pipelines (9), substantially utilizing the mass dilution. eden pressure. Method according to Claim 1, characterized in that the pressure in the mixing chamber (3) is adjusted to suit the operation of the system by means of a control valve (10) before the pulp tank (8). 3 · Apparatus for transferring the hot pulp mass from the pressurized, pulverized and pulverized space after the refiner or refiners to a substantially reduced pressure, preferably non-pressurized and that, like the pump, means such as rotors (5 and 6) or a combination of a screw (* 0 and a rotor (5 and 6) or plug screws (11) acting as a discharge device (2. 0) and 35 between the mixing chamber (3), characterized in that dilution water is arranged to be supplied to the mixing chamber (3), for example via c 64820 nozzles (7), to dilute the pulp to a consistency which allows pressure s.