MX2010009093A - Sludge reactor pump for simultaneously conveying solids, liquids, vapours and gases. - Google Patents

Abstract

The invention relates to a sludge reactor pump for conveying solid, liquid, evaporating and gaseous mixtures of liquids. According to the invention a liquid ring vacuum pump also has the characteristics of a radial pump. The conveying of solid matter and liquid is achieved by the formation of a phase partition using bores or slits around the periphery of a first stage and central slits in a second stage comprising conducting devices in the partition, for conveying liquids and solid matter from the exterior to the interior.

Description

REACTOR PUMP FOR SLUDGE FOR THE SIMULTANEOUS TRANSPORT OF SOLIDS, LIQUIDS, VAPORS AND GASES Field of the Invention The present invention relates to a slurry reactor pump for simultaneously transporting solids, liquids, vapors and gases, with a transport path extending over a first and second stage, with an axis, and with a centrifugal force acting on the trajectory of i transport. i Background of the Invention From EP 1 477 682 A1, a liquid ring gas pump for conveying gases is known. This pump has control discs between work spaces that have holes for the pumping medium. These holes are similarly formed on the suction and pressure side, and can be covered depending on the situation.

Document DD 134978 discloses a self-priming centrifugal pump with a liquid ring and a pump impeller mounted eccentrically in a housing for transporting clean and dirty liquids, wherein the central disk pointing towards the pressure side of the pump has i holes. For the reduction of pressure, ventilation cells are provided.

DE 699 24 021 T2 discloses a device for pumping liquids or suspensions, in which an area for separating gas is provided upstream of the impeller. I i None of the above-mentioned pumps can i transport simultaneously means with different states of agglomeration.

In particular in the reaction technology, there is a need for agitators in tanks that mainly allow a discontinuous reaction. With the aforementioned pumps of the prior art, the content can only be transported after completing the reaction obtaining a homogeneous liquid state that allows pumping with the known pumping systems.

During the reaction, the reaction mixture can not circulate, thereby precluding a continuous reaction.

Brief Description of the Invention j It is therefore an object of the invention to provide a slurry reactor pump by which the reaction mixtures can circulate during the reaction and achieve a good mixing in the transport system for the acceleration of the reaction and therefore both contribute to reduce the size of the reaction plant.

The main emphasis here is not to obtain good efficiency, but in the utilization of the energy lost for heating, the fluid transported to the reaction temperature.

The known pumping systems are not suitable for simultaneously transporting generated reagents consisting of gases and vapors on the one hand, and liquids charged with solids on the other hand. The radial pumps react to the gases and vapors generated during the reaction in a very critical way. The vapors generated during the reaction accumulate due to their low density in the center of the impeller where they can cause cavitation and an interruption of the transport. The associated insufficient NPSH values, this is the generation of unacceptable cavitation, results in the destruction of the pump. i The negative pressure necessary to suck the reaction mixture is possible to a limited degree only for the usual pumps with radial impeller and outside the range of the reaction mixtures in the chemical plants. Regenerative pumps are self-priming. However, the possible negative pressure is not sufficient for the reaction mixtures. Due to the narrow spaces the solids that are ported can clog the channels. The service life of the known transport devices is low, if transportation is possible.

One type of pump that generates high negative pressures at the inlet is the liquid ring gas pump known from EP 1 477 682 A1. However, it is not suitable for the transport of solids and liquids. This pump is suitable for sucking gases and vapors, but not liquids and solids. This way, we look for the possibility of making this type of pump also capable of transporting I solids and liquids, thus solving the object according to 'the invention.

Surprisingly, a solution was found for this.

According to the invention the object is solved because the transport path extends axially from the first to the second stage of and the transport path of the vaporizing liquids and the solids deviate with respect to the axial transport path of the gases from the outside to the inside by means of a guide chamber placed between the first and second stages, where the circumference of the first stage holes are formed in the guide chamber, through these holes, liquids and solids can reach the guide chamber, which in the guide chamber a plurality of guiding devices are formed, which guide the liquids and solids from the outside to the inside, and which in the interior is formed a mixing inlet through which liquids and solids they can enter the second stage and where within, the first stage, a gas outlet is formed through which the gas can enter axially into the chamber g and through the mix entrance to the second stage.

This is how a new type of pump that combines is provided! the liquid transport of the radial pump and the liquid transport of the annular ring vacuum pump and due to the specific configuration of the channels, also allows the transport of the solids. Only the combination of both systems allows to separate the gases and vapors generated during a reaction of the liquid and transport the two added states without any problem.

The separation of gases and vapors is carried out according to the principle of the liquid ring vacuum pump that separates them and transports them by means of the centrifugal force of the impeller towards | inside. The transport of solid and liquid substances in the circumference is carried out by means of a guide system of the control disc that transports these substances axially in the circumferences and thus continuously transports the new solid and liquid substances.

On both sides of the impeller, control discs are placed that delimit the pump chamber, the impeller and the control discs are placed eccentrically. With this, during the entry phase or during gas transport, a liquid ring can I develop which is supported at different distances against the center of the impeller. Spaces filled with gas are formed which become larger or smaller due to the eccentricity. In this operating state, the mud reactor pump is very suitable to also transport gases and vapors.

The liquid / vapor mixture is sucked through a suction groove that is arranged in the region of the greatest distance ?? ß? liquid ring from the center. Thanks to the different density, the reaction gas accumulates in the central region and is discharged through a pressure groove which is placed in the region of the smallest distance of the liquid ring from the central part.

Through the radial component of the impeller, the liquid separates from the gas phase and is discharged in the region of the greatest pressure of the housing through holes in the form of grooves or perforations placed in the diameter of the outer housing or I transports through a guiding device in the next stage. To divert the liquid, the guide vanes are placed upstream of the outlet orifices. Liquid transport is only possible with moderate efficiency. The loss of power generated serves to supply energy to the transported medium.

A narrow axial separation between the housing and the propeller as in the case of a liquid ring vacuum pump requires us because in accordance with the invention the liquid ring does not have to be stabilized in a closed chamber but includes exit orifices which they are arranged in the region of the greatest pressure in the housing, if necessary with a downstream guide device. The construction of the pump allows to crush all the solids and at the same time a tearing action in the transported medium. j In the guide device, the liquid flowing through the outlet orifices on the pressure side is deflected in a manner such that it is transported to the next stage or in the case of a single-stage machine is used as a bypass. This results in better mixing due to a longer residence time of the media and an additional energy input through friction that facilitates a faster reaction process.

Thus it is possible for the liquid ring or also the solid liquid liquid to be permanently exchanged and pushed by new entrants of solids and liquid in the next stage or in the transport line. This operational mode results in intense mixing between the liquid ring and the incoming transported medium.

Thus the capacity of the liquid ring vacuum pump is maintained to generate a negative pressure for the suction to transport the gases and vapors in the center as in a vacuum pump, and at the same time due to the principle of the radial impeller, for still transport the liquid-solid mixture, the sludge, in the reactive state at high temperature in the pump. j The size of the guide profiles and the orifices implemented in the embodiment according to the invention thus determines at the same time the transport range of the pump the transport range of the pump of the solid-liquid mixture. Another advantage is the possibility of cleaning the unit by reversing the direction of rotation of the pump.

Double-sided sliding ring seals are used as shaft seal They are independent of the direction of rotation, which are operated with a suitable liquid, for example oil, as a sealing medium between the pumping side and the seal on the atmosphere side.

The sealing medium circulates thanks to auxiliary pumps with a slight overpressure with respect to the seal on the side of the pump, according to the invention, the pump support is placed between | The internal and external seal in such a way that the sealing means is used to lubricate and cool at the same time. To keep the At the temperature of the slip ring seal and the terminal block within the allowable range, the heat exchangers are connected to the circuit.

The greater pressure of the sealing means with respect to the inner seal has the effect that the solid abrasive particles entrained with the mud, such as for example metal, glass; and stones, are kept away from the sealing space, the support and the shaft. In addition to the described use, additional mixing can be obtained in a loop mixer which is placed in a bypass tube between the stages (FIG. 9).

Brief Description of the Figures Next, an embodiment of the invention is described! i describes in greater detail below by means of the drawings. In the figures: Figures 1 to 5 each show cross sections through a mud reactor according to the invention; Figure 6 shows a diagram with respect to the capacity of the slurry reactor pump according to the invention; j Figure 7 shows a longitudinal cross section through the mud reactor pump; i Figure 8 shows a plant with a slurry reactor pump of Figure 7 and with an electric motor; j Figure 9 shows a loop reactor; j Figure 10 shows the reactor pump for sludge with electric motor.

Detailed description of the invention Figure 1 shows a cross section in the front part (first stage, or part ND) of the pump that is connected to the inlet port of the pump. The housing is designated with 1. The impeller has a blade ring which, viewed in the rotational direction, is tilted backward. An axis is designated with 3 A dividing wall is designated 4.

An outlet hole 5 serves to empty the pump. A liquid ring of a first stage (ND) is connected by i perforations 8 with an input for mixing 7.1 for a second stage (HD). Therefore the ring of liquids and solids formed with the centrifugal force on the outer circumference is inserted in a guide chamber 10 between the two stages and from there from the exterior to the interior towards the entrance of the mixture 7.1 placed inside. The gas that accumulates in the first stage in the interior enters the next stage through a gas outlet 7.2.

When the liquid enters the first stage the transport of the liquid takes place by means of the centrifugal force outwards and inside the liquid ring and through the holes 8 and a transport path through the central outlet 7 from the outside to the inside centrally in the next stage (HD). The gas portions that accumulate in the interior are not diverted, from stage to stage, but are transported axially from stage to stage. Figure 2 illustrates the system in detail. This figure shows the transport of liquid between stage 1 and stage 2 in the guide chamber 10 disposed between them.

Within the guide chamber 10 there are guiding devices that guide the liquid and solid substances guided from the outside to the inside between the stages in a fluid manner in the next stage in such a way that no obstructions or blockages of fluids occur. This is shown in more detail in Figure 3 which only illustrates an intermediate disk. Figure 3 shows only the part of the intermediate disc that is adjacent to the first stage, wherein the liquid discharge of the first stage is shown as the perforation 8.

Figure 4 illustrates the other half of the intermediate disk. Figure 5 also illustrates a gas inlet 7.3 and a gas outlet 7.4. The result of such transport device is shown in Figure 6. It is shown that the slurry pump has a high negative pressure on the inlet side of the pump; however, it generates a relatively low transport pressure of the pump, however it generates a relatively low transport pressure. This is very advantageous in chemical reactions with solids because the solids will clog a nozzle on the outlet side. However, at those low outlet pressures, the additional arrangement of the nozzles is not necessary because those pressure differences can be controlled by normal control valves without additional throttling with nozzles. ' Figure 7 shows the mode of a reactor pump for ions according to the invention with two reaction chambers. The designations correspond to those of Figures 1 to 5. Figure '9 shows the integration of such a slurry reactor pump that is driven by an tric motor, as a complete unit. The mud reactor pump is designated with 12. The engine that eats ! configured as an tric motor or combustion engine or combustion turbine, it is designated 13.

With 14 is designated the fan that cools the oil of the support cooling cycle of the support lubrication and the pressure seal to prevent the penetration of solid particles of the medium transported into the support. The storage tank for the storage volume of the support lubrication is designated 15. The pump for the cooling and lubrication circuit of; the lubrication of the support is designated 16. Since it is the task of the slurry reactor pump to mix and heat the sucked materials, a loop reactor is connected to the section and pressure line for further mixing, such a reactor loop further increases this effect. The latter is illustrated in Figure 9.

The invention is explained in greater detail in a special exemplary embodiment. This exemplary embodiment is illustrated in greater detail in Figure 10. A slurry reactor pump is coupled with an tric motor. The unit has an tric input power of maximum 200 kW and an average of 120 kW. The unit has a length of 3.5 m and the mud reactor pump is mounted on a support plate with vibration dampers. The mud reactor pump has a length of 795 mm. The pressure curve of the overpressure side is illustrated in the diagram of Figure 6.

Claims (6)

1. A slurry reactor pump for simultaneously transporting solids, liquids, vapors and gases, with a transport path extending over a first and second stage, with an axis, and with a centrifugal force acting on the transport path , characterized in that the transport path extends axially from the first to the second stage of and the transport path of vaporizing liquids and solids deviates with respect to the axial transport path of the gases from outside to inside by means of of a guide chamber (10) placed between the first and second stages, wherein the circumference of the first stage holes (9) are formed in the guide chamber (10), through these holes, liquids and solids can arrive to the guide chamber (10), which in the guide chamber (10) a plurality of guide devices (9) are formed, which guide the liquids and solids from outside to inside inside, and a mixing inlet (7.1) is formed through which liquids and solids can enter the second stage and where within the first stage, a gas outlet (7.2) form through which the gas can enter axially in the guide chamber (10) and through the mixing inlet (7.2) to the second stage.

2. The slurry reactor pump according to claim 1, characterized in that the support and sealing on both sides of the pump takes place with a specific overpressure on the inlet and outlet side of the mud reactor pump in the cooled circuit .

3. The slurry reactor pump according to claim 2, characterized in that a cooling fan (14) is provided.

4. The slurry reactor pump according to any of the preceding claims, characterized in that loop reactors are mounted on one or both sides of the slurry reactor pump, at the inlet, outlet or both sides.

5. The slurry reactor pump according to any of the preceding claims, characterized in that it has an electric motor (13) is coupled.

6. A method for transporting simultaneously solids, liquids, vapors and gases, with a transport path extending over a first and second stage, with an axis, and with a centrifugal force acting on the transport path characterized in that the liquids vaporized and the solids are transported from the first stage to the second stage by a deviation from the outside to the inside having a guiding camera placed between the first and second stages. I