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Fixed fluidized bed powder metering and distributing delivery device and method of realizing high stability transferring and distributing powder

A dispensing device and high stability technology, which is applied in the direction of conveying bulk materials, conveyors, transportation and packaging, etc., which can solve the problems of stable powder metering, difficulty in conveying and storage, inaccurate metering of small flow powder, and poor uniformity of distributed powder and other problems, to achieve the effect of reducing equipment investment and maintenance workload, high gas-solid ratio, and low flow speed

Inactive Publication Date: 2009-12-02
INST OF PLASMA PHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the particle shape of powder materials, the state of particle aggregation and the surface shape of powder materials, the physical properties of the powder are shifted between solid and liquid, making it difficult to measure, transport and store the powder stably.
[0003] Experts and scholars at home and abroad have done a lot of experiments and research on powder dense phase transportation, but few articles have been published on the stability and continuity of powder dense phase transportation, and the dense phase transportation is often Separately research and discuss powder metering, distribution, and conveying equipment. In the prior art, there have always been problems such as large instantaneous flow fluctuations, inaccurate metering of small flow powders, and poor uniformity of distributed powders in powder dense phase transportation.

Method used

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  • Fixed fluidized bed powder metering and distributing delivery device and method of realizing high stability transferring and distributing powder

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0044] Application of thermal plasma pyrolysis coal direct production of acetylene powder feeding device

[0045] (1) Put the pulverized coal into a fluidized tank with a diameter of φ500mm, and the computer control system sets Q1=60NM 3 / h;

[0046] Q2=10NM 3 / h; Powder feeding amount = 2500kg / h; Stirring speed = 200 rpm; The speed of the feeder is automatically fed back to the material level of the fluidized tank. Fluidizing gas Q1 and accelerating gas Q2 are nitrogen

[0047] (2) The diameter of the powder feeding pipe is φ6mm, the length of the powder feeding pipe is 10m, and 4 powder feeding pipes supply powder to a plasma reactor at the same time.

[0048] (3), the computer control system sets the powder feeding amount = 2500kg / h;

[0049] (4) The pressure of the plasma reactor is 0.05-0.2Mpa, and the temperature is 1800-3000°C.

[0050] Results: The actual powder feeding volume is 2450kg / h, the speed of powder particles entering the plasma reactor is 28m / s, and the...

example 2

[0052] Application of powder feeding device in plastic processing industry

[0053] (1), 10 sets of plastic extrusion molding machines, the amount of plastic powder needed for each set is different, and the time for using plastic powder is different. The current process is that each plastic extrusion molding machine has a set of powder metering and conveying equipment.

[0054] (2) Adopt a powder fluidized feeding device with a diameter of φ1000mm, the fluidized gas Q1 is air, and the computer control system sets Q1=100NM 3 / h; stirring speed = 200 rpm; the speed of the feeder is automatically fed back to the material level of the fluidized tank. Connect 10 powder feeding pipelines with different diameters and lengths on the side of the fluidized tank (design according to the position of each plastic extruder and the amount of plastic powder required).

[0055] (3) The computer control system sets Q1; the stirring speed; the speed of the feeder is automatically fed back to t...

example 3

[0059] Adding nano-calcium carbonate powder during the reaction of polyvinyl chloride

[0060] (1) Adding nano-calcium carbonate powder in the PVC reaction process can enhance the strength of plastic products and reduce costs. The current process is to disperse the nano-calcium carbonate powder in the water phase, and then use a high-pressure water pump to drive it into a polymerization kettle with a pressure of 0.8Mpa. Since the nano-calcium carbonate powder is lipophilic particles, it is difficult to disperse in the water phase, so it is necessary to add surface activity. The agent and dispersing pump run for a long time, which has the following disadvantages:

[0061] a. Surfactants are likely to cause adverse side effects;

[0062] b. The dispersing pump runs for a long time, so that the nanoparticles grow up and lose the effect of increasing the strength of plastic products.

[0063] Using vinyl chloride gas as the dispersion medium can solve the above problems well.

...

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Abstract

The invention discloses a powder metering, distributing and conveying device for a fixed fluidized bed, which comprises a fluidized tank, a powder feed pipe connected to the top of the fluidized tank, and a fluidized gas inlet pipe connected to the bottom of the fluidized tank. A powder level gauge is installed on the tank, a filter cloth fluidization gas distributor is installed at the lower end of the fluidization tank cavity, a mechanical stirring paddle is installed in the fluidization tank, and a mechanical stirring paddle is installed above the filter cloth fluidization gas distributor There are powder feeding pipelines on the side wall at the same height or slightly higher. This device is used to achieve high-stable metering, conveying and distributing powder, according to the physical characteristics of powder conveying, fluidized gas and powder feeding pipeline, as well as the diameter and length of powder feeding pipeline, the pressure between the fluidized tank and the powder receiving device, etc. The parameters are calculated precisely for each component. Only one piece of equipment is used to realize stable and continuous conveying, accurate metering and distribution of powder under high gas-solid ratio. The present invention is especially suitable for thermal plasma cracking coal direct production of acetylene powder feeding device and coal gasification device, and can be widely used in environments where powder is used, such as plastic processing, chemical industry, steel industry and the like.

Description

technical field [0001] The invention belongs to powder metering, distributing and conveying technology and device in powder engineering. Background technique [0002] Powder material is an intermediate state between solid and liquid. Some people call it the fourth state of matter besides solid, liquid and gas. In view of its special physical properties, it has developed into a special discipline of powder engineering, starting with the testing, processing and measurement of powder, as well as its mechanics, optics, and acoustics. Due to the particle shape of powder materials, the state of particle aggregation and the surface shape of powder materials, the physical properties of powder are shifted between solid and liquid, making it difficult to measure, transport and store powder stably. [0003] Experts and scholars at home and abroad have done a lot of experiments and research on powder dense phase transportation, but few articles have been published on the stability and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B65G53/16B65G53/40B65G53/66B65G53/52
Inventor 熊新阳孟月东
Owner INST OF PLASMA PHYSICS CHINESE ACAD OF SCI
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