The pneumatic conveying system uses the Roots blower as a gas source. It can transport powdery, granular, and fibrous materials. They include phosphate rock, coal powder, cement, carbon black, polyethylene, polypropylene, cotton, etc. Small pieces of material such as coal, rock.

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Advantages

Pneumatic conveying system with roots blower has a wide Applications. This is mainly because it has the following advantages:

(1) It transports the material in a closed pipeline. It is not easy to produce dust pollution to the environment. At the same time, the environment will not cause pollution to the materials or cause it to be damp. Thus it can guarantee the quality of the transported materials.

(2) It is easy to arrange the transmission line. Its floor space is small so that the space can be fully utilized.

(3) During material transportation, we can complete various production processes such as cooling, heating, and drying of materials.

(4) There are only a few mechanical transmission parts. The structure is simple. So the operation and management are convenient. The maintenance cost is low.

(5) It can do quantitative transportation. It is convenient for production scheduling and management.

(6) It can transport materials over long distances.

(7) It can transport Chemically unstable materials with inert gas.

Disadvantages

There are also some shortcomings in the pneumatic conveying system. The main disadvantages are:

(1) Large Power consumption.

(2) The components in the conveying pipeline are easy to be worn out. Because they are contacting with the airflow and the material. It is even harder, especially when conveying materials with high abrasiveness.

(3) It can not transport some materials, such as the following:

Brittle materials. They can cause mass degradation due to crushing or fail to pass the product;

Viscous materials or materials. They are easy to absorb moisture. Agglomerate is not suitable for use. Because they are easily blocked during transportation;

Grinding materials. They can cause damage of the line easily;

For the easily oxidizable material, we should transport them with inert gas;

If the Materials size is more than 50mm with high density, the system can not transport them.

Is it economical to use pneumatic conveying?

Although it has the above disadvantages, the total maintenance cost and operating cost per ton is much lower than other modes of transportation. If we can shorten loading and unloading time, we can improve the utilization rate of vehicles and vessels. Then the problem of higher power costs can be compensated. If we use other transportation methods to transport flour, granulated sugar, drugs or other foods, we need to carry our special treatment for hygienic protection. However, there is no requirement for pneumatic conveying. Although the cost of pneumatic power transmission is relatively expensive, the overall operating cost is much cheaper.

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The advantages and disadvantages of the roots vacuum pump

The roots vacuum pump is a kind of rotary vacuum pump volume.Its structure is evolved by the roots blower.It first appeared in in Germany, is in order to adapt to within 10 ~ pa pressure with large pumping speed of vacuum smelting system and used as mechanical booster pump.

Depending on the roots vacuum pump working pressure range, can be divided into straight row of low atmospheric vacuum roots pump;The roots vacuum pump (mechanical booster pump) and high vacuum multistage roots pump.In the largest domestic consumption is roots vacuum pump (hereinafter referred to as the roots pump).Roots pump compared with other mechanical pump oil seal type has the following features:

Roots pump start-up fast, low power consumption, low operation maintenance cost, large pumping speed, high efficiency, to be drained gas contains a small amount of water vapor and dust is not sensitive, in 100 ~ 1 mpa pressure range greatly extraction rate, can quickly remove all of a sudden release of gas.This pressure range is between mechanical vacuum pump and diffusion pump oil seal type.Therefore, roots vacuum pump is often in series between the oil diffusion pump and mechanical vacuum pump oil seal type, used to improve the swept volume middle pressure range.At this time it is also known as mechanical booster pump.

The roots vacuum pump smooth running, low noise, small vibration, high ultimate vacuum.Because of the driving part of the pump adopts reliable anti-backlash structure, so the pump can be long-term work under high pressure difference.Starting fast, can achieve in a short time limit vacuum.Because of the roots vacuum pump cavity without sliding parts, each other without oil lubrication, avoid the pollution of oil vapor on the system.The roots vacuum pump on the safe side, what ZJ had, ZJP roots vacuum pump itself installed with overflow valve series automatic protection.The roots vacuum pump compact structure, cover an area of an area small.Left, right, the following three vent can choose any one, easy to install.

Weakness: the roots vacuum pump energy consumption is relatively low, but the noise and vibration is opposite bigger, to the verification of the demand is higher, isolation processing needs to be done.

Roots vacuum pump is widely used in the vacuum metallurgy in refining, degassing and rolling, as well as the chemical industry, food, pharmaceutical industry in the vacuum distillation, vacuum concentration and vacuum drying, etc.

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