Details

Pneumatic conveying system

Brief introduction：

      Use the energy of the air stream,deliver granular material along the direction of airflow in a confined pipe,it is a specific application of fluidization technology. The pneumatic conveying device has the advantages of simple structure and convenient operation,capable of conveying horizontally, vertically, or obliquely.  In the process of conveying, it can also carry out physical, chemical or chemical operations such as heating, cooling, drying and air flow classification.

      According to the density of particles in the pipeline, pneumatic conveying is divided into:

     Working principle：

Low pressure air from an air source. The regulating valve (or pressure reducing valve), butterfly check valve, movable air pipe and nozzle enter into the diffusion chamber of the pump body. When the powder or granular material falls from the hopper and enters the high speed airflow zone between the nozzle and the diffuser, it is blown away. In addition, the gasification of the bottom gasifying device makes the material gasified into a suspension state. Thereafter, the high velocity air stream is fed into the expansion tube of the diffuser, flow through the throat diffusion tube, into the transmission pipeline, sent to the required discharge point, that is, to complete the feeding process.

Application area：

1、The hull of the food processing industry transportation process system；

2、Dry ash conveying technology system of biomass power plant；

3、Construction of concrete sand and stone conveying system for Hydropower Station；

4、Construction of steel grey warehouse and auxiliary equipment of grey warehouse；

5、Pneumatic conveying system for lower ash removal of electric and bag dust collector in thermal power plant；

6、Raw material and clinker conveying technology system in building material industry;；

7、Powder material transportation process system in metallurgical industry；

8、Process system for conveying powder materials and light particles in petroleum, chemical, food and other industries.

    Adaptive material：

    Flour, soybean meal, seasoning powder, fish meal, wheat, cocoa, salt, grain, soybean, dry yeast, cottonseed, cellulose, starch, sugar, grain feed, tobacco, talc, dolomite, limestone, Magnesium Oxide,, silica titanium dioxide, kaolin, firefly powder, bentonite, clay, jarosite, soil, clay, feldspar, detergent powder, fertilizer

    Mirabilite, urea granule, Zinc Oxide, lime, sodium carbonate, silica gel, sodium nitrate, aluminum hydroxide, sodium chlorate, sodium phosphate, sodium bicarbonate, borax (acid), gypsum powder, zinc powder, nickel powder,, carbon black, iron oxide, polypropylene PTA, PET, ABS, SBS, PVC, coal fly ash, nylon slice, carbon, cement, iron pellet, rubber particles and sawdust

    Characteristic：

The conveying mechanism and application practice of pneumatic conveying show that it has a series of advantages:Low carbon, environmental protection, high transport efficiency, equipment structure is more flexible, convenient maintenance and management, easy to realize automation, and conducive to environmental protection. Especially when it is used for conveying inside the workshop, it can combine the transportation process with the production process. This helps to simplify the process of equipment. Therefore, labor productivity, cost reduction and space occupation can be greatly improved.
    To sum up, pneumatic conveying has the following characteristics:
1.The pipeline can be flexibly arranged so as to make the equipment and process of the factory reasonable;
2.To achieve bulk material delivery, high efficiency, reduce packaging and handling costs;；
3.The system is airtight, dust flying, less escaping, good environmental sanitation;
4.Less moving parts, easy maintenance, easy to realize automation;
5.It can prevent the material from being damp, stained or mixed with other sundries, and can guarantee the quality of the conveying material;
6.In the conveying process can achieve a variety of process operations such as mixing, crushing, grading, drying, cooling, metering and dedusting etc.;
7.A long distance operation can be carried out by counting points to one place or from one place to another;
8.Inert materials can be used to transport chemicals that are unstable in their chemical properties.
 Although to some extent, the power consumption may be slightly larger compared with other transport forms,due to higher wind speed, local wear may occur and a small amount of material is crushed. However, the above deficiencies can be improved remarkably by adopting suitable transportation modes, such as low conveying speed and high mixing ratio.

 Process flow diagram

1. Process diagram of dilute phase system:

2. Process diagram of dense phase system：

3. Flow chart of combined trough pneumatic conveying process：

4. Flow chart of pneumatic conveying of spiral venturi:：

Structural analysis

1. Structure analysis of standard storehouse pump

2. Analysis of part structure of silo

Introduction of pneumatic conveying system

1. There are three main forms of pneumatic conveying system (as shown)：

1）. Dilute phase conveying system: The system uses large flow micro positive pressure gas to lift the material, and transported at a higher flow rate, usually for dry and well distributed materials. The disadvantage is greater wear on the pipe.

2）. Medium phase conveying system: The medium and low pressure gas is used to transport the material to medium distance, and the material is deposited at the bottom of the pipeline to form a moving bed. The conveying distance is far.

3）. Dense phase conveying system: At present, the most advanced pneumatic conveying technology is to transport materials at high pressure and low speed at a high solid gas ratio. The utility model has the advantages that the abrasion of the pipeline is low, and the energy consumption is saved.

2. Characteristics of dense phase pneumatic conveying system:

1）Completely airtight, no dust, clean and environmental protection;

2）There are many kinds of conveying materials and large transportation capacity;

3）Pipeline laying flexible and convenient, save space;

4）The feeding and discharging can be realized in one or more ways;

5）In addition to the valve door, almost no other action components, and therefore equipment failure point, maintenance rate is low;

6）Low energy consumption and low running cost;

7）The system is easy to realize fully automated operation;

3.Material type of conveying:

1）Fine powder materials: silica, titanium dioxide, alumina and so on;

2）High abrasive material: iron ore, copper concentrate, copper, coke etc.;

3）Fragile materials: pharmaceuticals, coffee granules, catalysts, etc.;

4. Brief introduction of pneumatic conveying silo pump

      The warehouse pneumatic conveying pump is the ideal equipment for pneumatic pneumatic conveying of powder material. The utility model is suitable for conveying powdery materials such as fly ash, cement, cement raw material, carbon powder, mineral powder, grain, chemical raw material, etc.

      The storehouse pneumatic conveying pump has absorbed the advanced structure of similar products at home and abroad. In the long-term use, and many improvements, its stable quality, reliable performance, pneumatic conveying is the ideal equipment.  For the high gravity, large material delivery, also show its unique good performance.  Products throughout the country and exported to Southeast asia.

Pneumatic conveying pump, compared with similar products and mechanical conveying, has unique advantages:

· The basic equipment is compact, small footprint, low maintenance cost.

· Set up automatic operation system, adopt PLC programmable controller or relay control, implement manual and automatic control, operation simple, flexible, automation degree is high.

·The fluidization device is more unique and has larger control means, which can make the conveying material fully fluidization, improve the conveying efficiency and guarantee the conveying quality.

· Every time an delivery is completed, the pump no residual material.

·The conveying pipeline can be flexibly arranged, and the utility model can be conveniently carried out by concentrating, dispersing, large height, long distance, adapting to various terrains, and carrying out efficient transportation.

·Because of the transportation in the sealed pipeline, the quality of the material can be strictly guaranteed, and the production and environmental protection can be beneficial to the production and the environment without being affected by damp or pollution, and without being influenced by various climatic conditions.

· Complete equipment, special specifications, the factory can be designed for the special manufacture.

1）Dense phase pump

· Small pump body, coarse pipe diameter, no discharge valve;

· Good adaptability to material

· Intermittent batch transportation;

· The conveying capacity is less than 25t/h;

· The basic transmission distance not exceeding 250 meters;

2）PD pump

· Large pump body, thin pipe, discharge valve;

· Suitable for powder with good flowability;

· When the conveying distance is less than 350m, the most economical;

· Pump body needs pre compression, so it is not suitable for grinding material;

3） CD pump

· Semi continuous conveying, high transportation efficiency;

· The pipeline always has pressure during transportation;

· Low speed conveying grinding or friable material;

4）D pump

· It can control the delivery of the pump and the pressure of the pipeline;

· It is suitable for difficult to send materials with poor fluidization;

·Relatively large gas consumption;

· Double pumps are usually used alternately;

5）TD pump

· Bottom fluidizing and upward discharging;

· Suitable for conveying dry material with good fluidizing property;

· Large conveying capacity;

· Shorter conveying distance;

6）  AV pump

· The utility model is suitable for conveying the dust catcher with multiple feeding points;

· Single line conveying capacity is not greater than 25t/h;

· Conveying distance is not more than 300 meters;

· The installation space is low and the structure is compact;

7）MD pump

·A multipoint delivery pump similar to a AV pump;

· 適合輸送流化性較好的除塵灰；It is suitable for conveying dust with better fluidizing property;

· 輸送能力比AV泵大；The delivery capacity is greater than the AV pump;

· 輸送距離比AV泵遠；Conveying distance is longer than AV pump;

8） K pump

· Continuous transportation;

· Apply to dry flowing powder;

· The conveying capacity can reach 200 tons / hour;

· Conveying distance up to 1500 meters;

5.Pneumatic conveying valve

     Dome valve is one of the core components of dense phase pneumatic conveying system, it adopts unique inflatable self compensating pressure sealing technology. The sealing ring of the valve will inflate automatically when the valve is completely closed. When the valve opens, it automatically releases, releases, retracts, and avoids contact and abrasion between the valve seat and the ball top of the valve core, greatly extend the service life of the sealing system. The special arrangement and treatment of the valve body and sealing ring material and the surface of the valve core and the inner cavity are carried out, suitable for different working conditions and environments (high temperature resistance, high pressure resistance, wear resistance, corrosion resistance).Dome valve performance is stable and reliable, can be used with the system, or as an independent product available to the user.

Dome valve features:

· When the valve is opened, the material in the chamber is accessible without obstruction;

· The valve is fully open and fully closed when only a 90 degree rotation;

· When the valve opens and closes, the ball top does not touch directly with the valve seat, greatly reduces the wear and tear;

· The sealing ring is inflated and sealed tightly, which can cut off the material flow and ensure the high tightness;

·  The temperature range of material medium ranges from -20 to 480 centigrade;

· The sealing pressure is up to 30barg;

· Just a little deal with the inner surface of the valve core and the valve, you can transport various properties of the material;

· Reliable performance, continuous action 1 million times.

Pneumatic conveying process case