CN113697402A

CN113697402A - Anti-back blowing powder conveying system

Info

Publication number: CN113697402A
Application number: CN202111016815.5A
Authority: CN
Inventors: 孙跃荣; 赵勇; 曹立强; 孙跃宗; 杨运海
Original assignee: Shenzhou Jiaxin Chemical Co ltd
Current assignee: Shenzhou Jiaxin Chemical Co ltd
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2021-11-26

Abstract

The invention discloses an anti-back-blowing powder conveying system, which comprises a screw conveyor, wherein at least one anti-back-blowing section is arranged in the screw conveyor; the back-blowing prevention section is formed by removing part of helical blades around the rotating shaft of the helical conveyor; the screw conveyor is divided into at least one front conveying section and at least one rear conveying section by the back blowing prevention section, and the front conveying section and the rear conveying section are provided with continuous helical blades. Can effectively prevent the reverse wind in the powder conveying process.

Description

Anti-back blowing powder conveying system

Technical Field

The present invention relates to a conveying system, and more particularly to an anti-blowback powder conveying system.

Background

The transportation of various powders (such as coal fines, etc.) has wide application in production. Taking barium salt production in chemical industry as an example, a coarse barium converter is important equipment for producing barium salt, one of fuels used in the coarse barium converter is coal-fired pulverized coal, and the pulverized coal is provided by a powder conveying system.

An existing powder conveying system is shown in fig. 1 and comprises a screw conveyor 2, a rotating shaft 7 is arranged in the screw conveyor 2, continuous helical blades 3 are arranged on the rotating shaft 7, a feeding port 1 and a discharging port 4 are respectively arranged at the head end and the tail end of the screw conveyor 2, and the discharging port 4 is connected with a pneumatic conveying pipeline 5. During operation, the motor 8 drives the rotating shaft 7 to rotate, so that the helical blades 3 push the pulverized coal entering from the feeding port 1 to the discharging port 4, the pulverized coal falls into the pneumatic conveying pipeline 5 after reaching the discharging port 4, and the air is supplied to the pneumatic conveying pipeline 5 through the air blower 6, so that the pulverized coal is blown into the coarse barium converter along the pneumatic conveying pipeline 5.

The existing powder conveying system has the following problems: the air pressure in the pneumatic conveying pipeline is high, air can be blown back into the screw conveyor from the discharge port (namely the air direction is opposite to the movement direction of powder), and the air is blown out from the feed port along the screw conveyor, so that the pulverized coal is blown up at the feed port, the pulverized coal in a workshop is blown up, the working environment is polluted, potential safety hazards are formed, and meanwhile, the backward blowing can also prevent the forward movement of the pulverized coal in the screw conveyor, and the energy consumption is increased; on the other hand, the existing conveying system has an unreasonable structure, so that the coal powder is often insufficient in supply when conveyed from the coal powder bin to the crude barium converter for combustion (particularly when the water is not separated and is slightly wet), the energy supply of the crude barium converter is insufficient, the quality of crude barium is reduced, the product consumption is increased, and the cost is increased.

Disclosure of Invention

In view of the shortcomings of the prior art, the present invention provides an anti-blowback powder delivery system.

An anti-back-blowing powder conveying system comprises a screw conveyor, wherein at least one section of anti-back-blowing section is arranged in the screw conveyor.

Alternatively, the back-blow preventing section is formed by removing a part of the spiral blade around the rotating shaft of the screw conveyor. The length of the back-blowing prevention section is 0.5 pitch to 2 pitches. The screw conveyor is divided into at least one front conveying section and at least one rear conveying section by the back blowing prevention section, and the front conveying section and the rear conveying section are provided with continuous helical blades.

Furthermore, a multi-section back-blowing prevention section is arranged. The multi-section back-blowing prevention section comprises a first back-blowing prevention section and a second back-blowing prevention section which are sequentially arranged along the direction away from the discharge port, and the length of the first back-blowing prevention section is smaller than that of the second back-blowing prevention section. The back-blowing prevention section is arranged in the range of the tail section of the screw conveyor 1/3.

The improvement in structure is that a star-shaped feeder is arranged at the discharge port of the screw conveyor. The pneumatic conveying pipeline is connected with a discharge port of the screw conveyor, and a Venturi accelerator is installed in the pneumatic conveying pipeline. The powder feeder also comprises a motor, wherein the motor drives a rotating shaft of the screw conveyor, so that the screw blades on the rotating shaft push the powder entering from the feeding hole to the discharging hole.

The invention has the beneficial effects that: the powder material can form a blocking area at the back blowing prevention section, and the air passing through the blocking area can be greatly reduced, so that only a small amount of back blowing air is blown out from the feeding hole, thereby avoiding a large amount of coal powder from being blown up at the feeding hole, effectively preventing the dust in a workshop from flying, reducing the working environment pollution and eliminating the potential safety hazard; through the optimization of structure, be more favorable to the transport of buggy, ensure the powder supply.

Drawings

FIG. 1 is a schematic diagram of a prior art configuration;

FIG. 2 is a schematic structural view of embodiment 1;

FIG. 3 is a schematic structural view of an anti-blowback section;

FIG. 4 is a functional schematic of the delivery system of the present invention;

FIG. 5 is a schematic structural view of example 2;

FIG. 6 is a schematic structural view of embodiment 3;

FIG. 7 is a schematic structural view of example 4.

Detailed Description

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the preferred embodiments of the present invention when taken in conjunction with the accompanying drawings. Like reference numerals refer to like parts throughout the drawings. The drawings are not intended to be to scale, emphasis instead being placed upon illustrating the principles of the invention.

Example 1

Referring to fig. 2, the powder conveying system of the present invention and the prior art mainly include that a back-blowing prevention section 9 is added in the screw conveyor 2, the screw conveyor 2 is divided into a front conveying section 10 and a rear conveying section 11 by the back-blowing prevention section 9, the front conveying section 10 and the rear conveying section 11 are both provided with continuous helical blades 3, the back-blowing prevention section 9 is not provided with helical blades, that is, the back-blowing prevention section 9 is formed by removing part of the helical blades 3 around the rotating shaft 7, and the part shown by dotted lines in fig. 3 is the removed part of the helical blades.

The working engineering of the anti-back-blowing system of the present invention will be described in detail with reference to fig. 4, powder (for example, coal powder) enters the screw conveyor 2 from the feeding port 1, the motor 8 drives the rotating shaft 7 to rotate, thereby driving the front section 10 and the rear section 11 of the screw conveyor to rotate simultaneously, the powder entering the screw conveyor 2 reaches the anti-back-blowing section 9 under the pushing of the front section 10, because there is no blade in the anti-back-blowing section 9, the powder will be accumulated in the anti-back-blowing section 9, the anti-back-blowing section 9 will be almost blocked along with the gradual accumulation of the powder, meanwhile, because the powder is continuously conveyed from the front section 10 to the anti-back-blowing section 9, the accumulated powder will gradually move forward to the rear section 11, and the rear section 11 will convey the accumulated powder to the discharging port 4. Can prevent that back-blowing section 9 forms stable jam district like this in transportation process, the blowback that gets into among the auger delivery 2 can receive blockking of jam district, and the wind through jam district can reduce greatly for only there is a small amount of blowback to blow off from the feed inlet, thereby has avoided a large amount of buggy to be blown up in feed inlet department, can effectively prevent that dust in the workshop from flying upward, reduces operational environment pollution, eliminates the potential safety hazard.

It should be noted that the blocking effect of the blocking area is in direct proportion to the length of the back blowing prevention section 9, that is, the shorter the length of the back blowing prevention section 9 is, the less powder is accumulated in the blocking area, and the larger the back blowing air passing through the blocking area is; on the contrary, the longer the length of the anti-back blowing section 9 is, the more powder is accumulated in the blocking area, and the smaller the back blowing air passing through the blocking area is. The length of the back-blowing prevention section 9 is in direct proportion to the powder conveying energy consumption, namely the shorter the length of the back-blowing prevention section 9 is, the less powder is accumulated in a blocking area, the smaller the conveying resistance is, and the lower the energy consumption is; on the contrary, the longer the length of the back-blowing prevention section 9 is, the more powder is accumulated in the blocking area, the larger the conveying resistance is, and the higher the energy consumption is.

Therefore, the length of the back blowing prevention section 9 should not be too long or too short, preferably from 0.5 pitch to 2 pitches, and in fig. 2 and 3, the back blowing prevention section is formed by removing blades with 1 pitch. Less than 0.5 pitch is difficult to form the jam area, and can cause a large amount of powder to pile up in the auger delivery machine after getting rid of too much blade, can increase the transport energy consumption, and the section 9 of preventing blowing back of overlength also causes the anterior segment 10 to can not effectively promote the powder in the section 9 of preventing blowing back and to move to back end 11 simultaneously easily to cause the auger delivery machine to block up, can not accomplish the transport of powder.

Example 2

This embodiment focuses on differences from embodiment 1, and the same parts will not be described again. Unlike embodiment 1, a plurality of blowback prevention sections 9 are provided in this embodiment. In fig. 5, a first back-blowing prevention section 9.1 and a second back-blowing prevention section 9.2 are arranged, the first back-blowing prevention section 9.1 is close to the feed inlet 1, and the second back-blowing prevention section 9.2 is close to the discharge outlet 4, namely, the first back-blowing prevention section 9.1 and the second back-blowing prevention section 9.2 are sequentially arranged along the direction far away from the discharge outlet 4. The arrangement of a plurality of back-blowing prevention sections can further reduce back-blowing.

In fig. 5, the first back-blowing prevention section 9.1 has a length of 0.5 pitch, and the second back-blowing prevention section 9.2 has a length of 1 pitch. That is, the length of the first back-blowing prevention section 9.1 is less than the length of the second back-blowing prevention section 9.2, so the setting is because the second back-blowing prevention section 9.2 is close to the inlet of the back-blowing, plays a main role in blocking, and needs to have a better blocking effect, and the back-blowing prevention section 9.2 through the second is smaller, the setting of the shorter first back-blowing prevention section 9.1 can realize almost complete blocking of the back-blowing, and if the length of the first back-blowing prevention section 9.1 is set to be too large, the analysis through the embodiment 1 can know that the energy consumption of the system can be increased.

Example 3

In this embodiment, as shown in fig. 6, the blowback prevention section 9 is provided near the discharge port 4, i.e., at the tail of the screw conveyor, and preferably, it is provided within 1/3 of the tail. Because the back-blowing prevention section 9 is close to the discharge port 4, the back-blowing only influences the powder conveying from the blocking area to the discharge port 4, and the powder conveying between the feed port 1 and the blocking area is not influenced (the influence is extremely small), so that the conveying efficiency is improved.

Example 4

The embodiment is mainly used for further optimizing the structure of the conveying system. Referring to fig. 7, a star-shaped feeder 12 is arranged at the discharge port 4 and used for reducing the air volume and pressure entering the screw conveyor 2 when the fan 6 is blowing against the wind; the venturi accelerator 13 is added in the pneumatic conveying pipeline 5, and the outlet of the star-shaped feeder 12 forms a micro negative pressure state through the venturi accelerator 13, so that the pulverized coal is conveyed out, the probability of reverse wind to the star-shaped feeder 12 is reduced, and the pulverized coal conveying is facilitated.

Through the fact application of each scheme in the coarse barium converter coal feeding system, the coal feeding system can run stably, the condition that coal dust pollutes a workshop due to coal dust breaking and reverse wind does not occur, the coarse barium quality is stable, the quality of the coarse barium is improved by 1.5 percent on average in a month, 30kg of barite is reduced by one ton of barium sulfate, 300 tons of barite is saved in a year, and the cost is saved by 19 ten thousand yuan. The down time is reduced by 15 days. The economic benefit is remarkable.

In the previous description, numerous specific details were set forth in order to provide a thorough understanding of the present invention. The foregoing description is only a preferred embodiment of the invention, which can be embodied in many different forms than described herein, and therefore the invention is not limited to the specific embodiments disclosed above. And that those skilled in the art may, using the methods and techniques disclosed above, make numerous possible variations and modifications to the disclosed embodiments, or modify equivalents thereof, without departing from the scope of the claimed embodiments. Any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the scope of the technical solution of the present invention.

Claims

1. The anti-back-blowing powder conveying system is characterized by comprising a screw conveyor, wherein at least one anti-back-blowing section is arranged in the screw conveyor; the screw conveyor is divided into at least one front conveying section and at least one rear conveying section by the back blowing prevention section.

2. The conveyor system according to claim 1, wherein said blowback prevention section is formed by removing a portion of the helical blades around the axis of rotation of said auger.

3. The conveyor system of claim 2, wherein the length of the back-blow prevention section is 0.5 to 2 pitches.

4. A conveyor system as in claim 1 wherein the front and rear conveyor sections each have continuous helical flights.

5. A conveyor system according to claim 1, wherein a multi-stage blow-back prevention stage is provided.

6. The conveying system of claim 5, wherein the multi-section back-blowing prevention section comprises a first back-blowing prevention section and a second back-blowing prevention section which are sequentially arranged in a direction away from the discharge port, and the length of the first back-blowing prevention section is smaller than that of the second back-blowing prevention section.

7. The conveyor system of claim 1, wherein the blowback prevention section is disposed within an aft section of the auger 1/3.

8. The conveying system according to claim 1, wherein a star shaped downer is provided at the discharge outlet of the screw conveyor.

9. The conveying system according to claim 1, further comprising a pneumatic conveying pipe connected to the discharge port of the screw conveyor, wherein a venturi accelerator is installed in the pneumatic conveying pipe.

10. The conveyor system of claim 1, further comprising a motor that drives the shaft of the screw conveyor such that the helical blades on the shaft push the powder entering from the inlet toward the outlet.