CN100348306C

CN100348306C - Equipment for blending light-wt. dry powder material

Info

Publication number: CN100348306C
Application number: CNB2005100956444A
Authority: CN
Inventors: 史册; 李金平; 乔成斌; 王树霞
Original assignee: Sinopec Yizheng Chemical Fibre Co Ltd
Current assignee: Sinopec Yizheng Chemical Fibre Co Ltd
Priority date: 2005-11-10
Filing date: 2005-11-10
Publication date: 2007-11-14
Anticipated expiration: 2025-11-10
Also published as: CN1792421A

Abstract

The present invention provides a set of equipment which is suitable for blending light-weight powdery dry material. The end of a charging pipe of batching solvent is provided with a nozzle which is arranged in a charging channel of solid material, and a double-layer blade of which the upper layer is provided with a toothed disc type blade and the lower layer is provided with a push-type blade is arranged on a stirrer of a blending tank; thus, powdery solid material is easily collected, dust flying caused in the process of charging is greatly eliminated, solid objects which is formed because material falls on the internal liquid surface in the blending tank are easily scattered, and the blending effect is improved. The equipment has the advantages of safe operation and uniform and stable blended solution or slurry material, is suitable for various industrial processes of additive preparation, etc., has great meaning to large-scale continuous production equipment for polyester polymerization, etc., and has good popularization and application prospects.

Description

Light powdery dry material blending device

Technical Field

The invention relates to a technical process and a device for blending solid materials (solute) in liquid (solvent) in the chemical production process, in particular to a blending device of light powdery dry materials with specific gravity close to or lighter than the solvent, belonging to the technical field of chemical ingredients.

Background

The batching is a common procedure in chemical production, and aims to mix solid materials and liquid materials to form a solution or prepare a slurry which is relatively uniform in dispersion and can be maintained for a long time so as to be convenient for the next procedure. To the applicant's knowledge, the industry currently uses a "blending tank + disperser" device for the cyclic dosing. In this kind of blending device, be equipped with the agitator in the inside of blending tank, the bottom of blending tank sets up two export routes: one is a circulation route, and a disperser is arranged on a pipeline; the other is a normal discharging route. In the material mixing process, the circulation route is opened, the discharge route is closed, the materials are prepared into solution or slurry meeting the process requirements through the circulation operation of stirring → dispersing → re-stirring → re-dispersing, and then the circulation route is closed, the normal discharge route is opened, and the materials are supplied for the next procedure.

The practical operation finds that the blending device is suitable for solid matters with granular solid structures, and can achieve better application effect no matter whether the solid matters are fine particles with larger specific gravity or coarse particles with larger particle size. However, for particles with a lighter and porous structure, especially for light powdery dry materials with a specific gravity close to or lighter than a solvent, the blending device has many defects, such as large dust amount, easy caking, serious influence on the blending quality of the slurry, high solute consumption ratio, severe environmental pollution on the blending site, and physical and psychological damage to operators.

Disclosure of Invention

The invention aims to improve the existing industrial batching device, enhance the stirring effect, collect dry powder suspended dust, improve the field environment and make the prepared solution or slurry more uniform, thereby forming a set of more ideal light powdery dry material blending device.

The purpose of the invention is realized by the following technical scheme:

powdery drier blending device of light, including surge tank, deconcentrator, be equipped with the agitator in the inside of surge tank, the bottom of surge tank sets up circulating line and discharging pipeline, installs the deconcentrator on the circulating line, its characterized in that: the tail end of a feeding pipe for the batching solvent is provided with a nozzle which is arranged inside a feeding channel of the solid material; the stirrer of the blending tank is provided with double-layer blades, the upper layer is a fluted disc type blade, and the lower layer is a propulsion type blade.

The purpose of the invention is further realized by the following technical scheme:

in the light powdery dry material blending device, the nozzle is arranged at the center of the solid material feeding channel and is a three-hole nozzle, one path in the middle is a radial jet hole, and the other two paths are spiral jet-shaped jet holes.

Still further, according to the light powdery dry material blending device, the teeth on the toothed disc type blade are distributed in two circles, the directions of the teeth are respectively upward and downward to form two circles, and the number of the teeth on each circle is 40-50.

Still further, in the light powdery dry material blending device, the installation position of the fluted disc type blade on the stirring shaft is consistent with the blending liquid level of the blending tank.

Still further, in the light dry powdery material blending device, the bottom of the blending tank is connected with a nitrogen or compressed air pipeline through a check valve.

Furthermore, in the light powdery dry material blending device, an inlet and outlet pipeline of the disperser is a jacketed pipe, and a heat tracing medium is introduced into the jacketed pipe; and the disperser pump body is in contact with the cooling water.

Furthermore, in the light dry powdery material blending device, the propelling blade is a three-blade sweepback propelling blade.

Therefore, the invention adopts the spraying solvent to capture solute dust, and is additionally provided with the double-layer stirring paddle to enhance the dissolving effect of the blending tank, thereby better eliminating the dust flying caused in the feeding process of the light powder, and leading the light material to fall into the tank and be easier to break up solid substances formed on the liquid surface. The bottom of the blending tank is connected with nitrogen or a compressed air pipeline through a check valve, so that the materials can be damped and agglomerated, and the double-layer blades cannot be scattered, or when the materials are agglomerated and fall into the tank too fast to block a discharge port and a discharge pipeline in the tank, even if the materials are intensively stirred, the materials are difficult to disperse and dredge, nitrogen or compressed air with higher pressure is introduced to carry out blowback and bubbling, so that the stirring operation is well supplemented, and the probability of the occurrence of batching faults is greatly reduced. In addition, the invention also introduces a heat medium into an inlet and an outlet jacket pipes of the disperser, so that the circulating liquid is heated, and the dispersing effect of the light solid in the circulating liquid is ensured; meanwhile, the pump body of the disperser is forcibly cooled by adopting a mode of adding cooling water, so that the stable operation of the mobile equipment is ensured.

In a word, the invention provides a set of device suitable for blending the light powdery dry material through technical improvement, which not only improves the operation safety, but also can make the blended solution or slurry more stable and uniform. The technical scheme is suitable for various industrial processes such as additive preparation and the like, and has great significance for large-scale continuous production devices.

Drawings

The technical scheme of the invention is further explained by combining the attached drawings. Wherein,

FIG. 1 is a schematic view of the system of the apparatus of the present invention;

FIG. 2 is a schematic view of a nozzle configuration;

FIG. 3 is a perspective view of the assembled mixer;

FIG. 4 is a front view of FIG. 3;

FIG. 5 is a top plan view of an upper stage fluted disc blade;

FIG. 6 is a left side view of FIG. 5;

FIG. 7 is a top view of a lower propulsion blade.

In the figure, 1-light powdery dry material, 2-solvent, 3-nitrogen or compressed air, 4-heat tracing steam, 5-condensed steam, 6-cooling water, 7-blending tank, 8-disperser, 9-nozzle, 10-stirrer, 11-fluted disc type blade, 12-propulsion type blade and 13-tooth.

Detailed Description

As shown in figures 1 to 7, the light powdery dry material blending device comprises a blending tank 7 and a disperser 8, wherein the light powdery dry material 1 is added from a solid feeding port at the top of the blending tank 7, and a solvent 2 is fed into the tank through a valve V-1. The end of the solvent 2 feed pipe is provided with a nozzle 9, and the nozzle 9 is arranged inside the feed channel of the solid material. The blending tank 7 is internally provided with a stirrer 10, the stirrer 10 is provided with double-layer blades, the upper layer is a fluted disc type blade 11, and the lower layer is a propulsion type blade 12 (figures 3 and 4). The teeth 13 on the fluted disc type blade 11 are distributed in two circles, and the directions of the teeth 13 are respectively upward and downward to form two circumferences (fig. 5 and 6); the lower propulsion blades 12 may be conventional three-bladed sweepback propulsion blades (fig. 7). The bottom of the blending tank 7 is provided with a circulating pipeline and a discharging pipeline which are respectively controlled by valves V-2 and V-3, and a disperser 8 is arranged on the circulating pipeline.

The nozzle 9 is installed at the center of the solid material feeding channel, and is a three-hole nozzle, one path in the middle is a radial jet hole, and the other two paths are spiral jet-shaped jet holes, as shown in fig. 2. The nozzle with the structure can make the sprayed solvent fine drops fall along a spiral path, and after the falling path is prolonged, the collection degree of the light powdery dry material 1 can be enhanced, and the collection effect can be improved.

The fluted disc type blade 11 has the functions of enhancing the liquid level dispersion effect and preventing light substances from caking and floating on the surface. The radius of the paddle in the layer is calculated according to the stirring power, the installation height H of the paddle on the stirring shaft is determined according to the dosage of the mixing tank 7, the specific position is basically consistent with the static liquid level in the mixing tank 7 and is about 10cm below the liquid level of the beating paddle. After the installation height H is determined, the fluted disc type blade 11 can be fixed on the stirring shaft through a locking screw.

In addition, a bubbling facility is provided at the bottom of the blending tank 7, and nitrogen gas or compressed air 3 is communicated with the interior of the blending tank 7 through a check valve V-4. The inlet and outlet pipelines of the disperser 8 are jacketed pipes, the heat tracing steam 4 is introduced into the jacket, so that the device has the comprehensive efficiency of 'heating → dissolving → batching', and the condensed steam 5 formed by the heat tracing steam 4 is externally connected through a pipeline. Under the condition, the material condition in the blending tank 7 can be timely mastered through the liquid level meter LI and the thermometer TI, and meanwhile, the pump body of the disperser 8 needs to be cooled by the cooling water 6, so that the normal operation of the mobile equipment is ensured.

When the technical scheme is applied, the adding amount of the solvent 2 is calculated firstly, and the solvent is metered into the blending tank, so that the solute can be fully dissolved as much as possible; the solution is not supersaturated, or the viscosity of the solution is not enough to overload a stirring motor; and thirdly, the blade can be immersed into the upper layer fluted disc type blade by about 10 cm. The stirrer 10 and disperser 8 are then activated and the heating and cooling medium turned on to allow the apparatus to function properly. Then, powder is evenly added from a solid feeding port, solvent spraying is started at a proper time, the other part of the solvent which is counted and metered is added into a blending tank 7 from a nozzle 9, and the spraying solvent is used for capturing suspended powder particles, so that the aims of reducing dust and enhancing the solubility are fulfilled. If the powdery material 1 is agglomerated due to external reasons, and is difficult to dissolve or disperse when entering the blending tank 7, and still cannot meet the requirements after long-time stirring, the disperser 8 should be stopped in time at this moment, the valve V-2 is closed, and nitrogen or compressed air 3 with higher pressure is introduced into the tank from the check valve V-4 for bubbling, so that the effect is obviously improved.

The technical scheme of the invention is suitable for various industrial processes such as additive preparation and the like, has great significance for large-scale continuous production devices such as polyester polymerization and the like, and has good popularization and application prospects.

Claims

1. The blending device for light powdery dry materials, including blending tank and disperser, a stirrer is arranged inside the blending tank, a circulation pipeline and a discharge pipeline are arranged at the bottom of the blending tank, and a disperser is installed on the circulation pipeline, which is characterized in that : The end of the feeding pipe of the batching solvent is provided with a nozzle, which is arranged inside the feeding channel of the solid material; the agitator of the blending tank is equipped with double-layer paddles, the upper layer is a toothed disc type blade, and the lower layer is a pusher type blade.

2. The light powdery dry material blending device according to claim 1, characterized in that: the nozzle is installed at the center of the solid material feeding channel, it is a three-hole nozzle, and the middle path is a radial jet hole, The other two paths are spiral jet jet holes.

3. The light powdery dry material blending device according to claim 1, characterized in that: the teeth on the disc-shaped paddle are distributed in two circles, and the teeth are directed upwards and downwards respectively, forming two circles. circumference.

4. The light powdery dry material preparation device according to claim 3, characterized in that: the number of teeth on each circumference is 40-50.

5. The light powdery dry material blending device according to claim 1, characterized in that: the installation position of the toothed disc-type paddle on the stirring shaft is consistent with the batching liquid level of the blending tank.

6. The light powder dry material blending device according to any one of claims 1-5, characterized in that: the bottom of the blending tank is also connected to nitrogen or compressed air pipelines through a check valve.

7. The light powder dry material blending device according to any one of claims 1-5, characterized in that: the inlet and outlet pipelines of the disperser are jacketed pipes, and a heat tracing medium is passed through the jacket; and, The pump body of the disperser is in contact with the cooling water.

8. The light powdery dry material blending device according to any one of claims 1-5, characterized in that: the propulsive paddle is a three-bladed back-swept propulsive paddle.