Positive pressure dense phase pneumatic conveying

The positive pressure dense phase pneumatic conveying system has the characteristics of simple system, flexible layout, reliable operation, high degree of automation, low investment, high ash gas ratio, low flow rate, small maintenance workload and low annual operation cost.

The system includes feeding device, sending bin pump, pipeline, valve, dust removal device at the top of the warehouse, gasification device at the bottom of the warehouse, unloading device at the bottom of the warehouse, power gas source, program control device, etc.

Operation phase

Working principle and operation stage of positive pressure dense phase pneumatic conveying system

The positive pressure dense phase flow pneumatic ash removal system is developed by combining the fluidization and gas-solid two-phase flow technology

Stage 1: reliable, high strength dome valve to close the transmitter feed port

Stage 2: the conveying air is introduced into the transmitter through the fluidizing plate to make the dry ash charging and distributing more efficient

Stage 3: the ash is transported while fluidizing in the form of continuous dense phase

Stage 4: the applied air pressure is maintained until the dry ash enters the ash silo

Stage 5: the air entering the ash bin is discharged from the ash bin through the bag filter

The whole operation process is controlled by full-automatic PLC and local manual control.

Pneumatic conveying system, positive pressure dense phase pneumatic conveying system

Performance characteristics

Performance characteristics of positive pressure dense phase pneumatic conveying system

The equivalent conveying distance of the positive pressure dense phase pneumatic conveying technology is 50-1500 meters, in which the lifting height has reached 75 meters, the conveying capacity of the system can reach 100 t / h, the minimum temperature of conveying materials is - 20 ℃, and the maximum temperature is 450 ℃.

The ash gas ratio of the system is high: 30 ~ 60kg (ash) / kg (gas); Low velocity: initial velocity 3-6M / s, final velocity 12-18m / s, average velocity 8-12m / s; Small wear: ordinary seamless steel pipe is used as conveying pipe; Long service life: up to 20 years.

1. The transported materials are in bulk, so there is no need to pack and unload bags. The operation efficiency is high and the cost is low.

2. The equipment is simple, covers a small area, and can even make full use of space, with less investment and maintenance costs.

3. The conveying capacity is not limited to the size, the operator is less needed, and the full automation of unmanned management can be realized, so the labor cost is less.

4. The transported materials are not affected by the climate and the surrounding conditions of the pipeline layout, and the layout of the production workshop is relatively easy.

5. The pipeline can be arranged flexibly, which makes the configuration of plant equipment more reasonable.

6. It can avoid the material moisture, dirt or mixed with other debris, and can ensure the quality of conveying materials.

7. In the process of transportation, various process operations can be realized, such as mixing and crushing, classification, drying, cooling and dedusting, and some chemical reactions.

8. It can carry out the long-distance control from several points to one place or from one place to several points.