Introduction of pipeline dense phase pulse pneumatic conveying device

Air knife pneumatic conveying applications are widely used. The domestic dense phase pulse pneumatic conveying device has been able to achieve the conveying energy of similar imported devices. There are quite a lot of finished pellets and many powdery raw materials in the production of synthetic fibers. In the 1980s, most large-scale enterprises introduced complete material conveying devices. The air blower is mainly the dilute phase pneumatic conveying of the main equipment. This type of equipment not only consumes a large amount of energy, but also easily breaks the conveyed section due to the faster gas velocity. At the beginning of the 1990s, dense-phase pneumatic conveying of pipelines gradually entered the material transportation project of the industry. At present, the dense-phase pulse air knife-type pneumatic conveying is more common, and after years of practice, various forms have been developed to adapt to the serialization of different occasions. The conveying device has reported the use of a high-pressure-resistant rotary unloader to form a continuous material conveying device in China, but it has not yet reached the stage of promotion and application. The following focuses on the dense phase pulse pneumatic conveying device and its application.

1 dense phase pulse pneumatic conveying basic form 1.1 sending tank pulse air knife type gap conveying device single sending tank pulse air knife type intermittent conveying device as shown. Before the feeding bin feeds the sending tank, first open the exhaust valve, when the sending tank pressure drops to zero, and then open the feed valve, the transported material enters the tank 1 from the feed valve 2, using a programmable controller or The feed level gauge is used to control the feed amount. When the predetermined amount is reached, the feed ends, the feed valve and the exhaust valve are closed, and the inflation valve is opened. When the pressure in the tank to be sent rises to a prescribed value, the discharge valve is opened, and the discharge tank is opened. The material is squeezed into the feeding pipe by the pressure inside the tank, and the relatively dense stream continuously enters the conveying pipe 3, and then the pulse solenoid valve is opened, and one end of the conveying pipe is connected with the air knife 8, and the pulse airflow is controlled by the solenoid valve. In this way, the continuous flow is cut into a shorter material plug by the pulsed airflow, and the air plug and the material plug are flowed to form the normal compressed air. The upper part of the tank is pressurized to press the tank in some cases. At the same time, a small amount of air can be introduced from the conical portion of the tank to loosen the local powder material to facilitate the discharge. The single-sending tank type is discharged through the conveying pipe due to the residual material and residual gas in the circulating tank, and the instantaneous speed may be faster than the dilute phase conveying, and the material wear is greater because the exhaust gas inflating stage is not in each cycle. These auxiliary times of feeding affect the ability of the equipment to transport. Therefore, when possible, the parallel double-sending tank type pneumatic conveying method is used, and the two sending tanks are alternately operated, thereby maintaining the advantages of dense phase plug flow conveying, and continuously conveying materials and improving the conveying capacity of the equipment.

Pulse air knife type plug flow pneumatic conveying device system 1. material tank; 2 feed valve; 3. conveying pipeline; 4. air discharge filter; 5. separator; 6. exhaust valve; 7. air source adjustment; Air knife and solenoid valve; 9. Inflator valve 12 double transmission tank pulse air knife type continuous conveying device parallel double transmission tank pneumatic conveying device As shown in the case of A tank feeding, B tank starts to feed, in standby state A tank The pressure sensor detects the pressure inside the tank to judge that the material in the tank is moving, and the transporter 5 discharges the feed and feeds the vegetables. 8 senses the power from the 1 country. 4 The technology is about to be delivered, when the pressure signal drops to some A set pressure value indicates that the material is approximately conveyed and controlled by PLC, and the A tank discharge valve is closed to open the B tank discharge valve in the standby state, the B tank starts to feed, the A tank feeds, and is in the standby state, thereby repeating Cycle until the gas supply pressure in the conveying pipe is almost constant until the material is delivered, the material is in the state of plug flow, and after the material is delivered, the only procedure for purging the remaining material in the sending tank and the conveying pipe is finally made. In order to reduce the gas consumption and maintain the logistics speed. Change, reduce the degree of material breakage.

Double transmission tank pulse air knife type conveying process 1. Air source adjustment; 2, 3. Inflator valve; 4, 5. Feed valve; 6, 7. Exhaust valve; 8, 9. Discharge valve; Tank; 12. loading silo; 13. air knife valve 1.3 tank compact phase pulse pneumatic conveying device using tank truck to transport powder and pellets, has been widely used in industry, compared with bagged gap transport, it It has the characteristics of no material scattering during loading and unloading, no material retention in the bag, and more importantly, it can reduce many intermediate turnover links, reduce the stacking site, and save a large number of packaging bags. Therefore, when the conveying distance exceeds a certain range, the tank truck is adopted. The transportation has greater advantages. (1) PTA tanker pulse air knife type pneumatic conveying device PTA tank truck pulse air knife type pneumatic conveying device is seen as the pulse air knife type bolting device. After pressing into the conveying pipe, the column is cut into a plug-like material flow in a timely manner to make the whole conveying pipe be in the gas phase, and the static pressure conveying state under the pressure gradient state is achieved.

(2) PET tanker pulse-filled pneumatic conveying device PET tanker pulse-filled pneumatic conveying device has the same basic structure as described above, except that the pulsed air supply air is parallel to the conveying pipe. From the back of the feed inlet of the conveying pipe, the inlet air pressure is slightly lower than the pressure in the storage tank, so as to increase the feed amount of the material in the tank storage tank into the conveying pipe. When the pulsed gas is charged into the conveying pipe, the entering The feeding amount of the conveying pipe has little influence, and the air supply pressure and the pulse frequency can be adjusted to control the air supply amount. When the pneumatic energy entering the conveying pipe is gradually consumed, the pulsed gas can be replenished in time to enable the material to continue to move and finally transform. For static pressure delivery. When the airflow of the "air knife" mentioned above is wedged into the column, the air plug exerts a certain pressure on the material before and after, and the material plug in the conveying direction moves forward by the static pressure, and the column of the feeding port receives the gas. The action of the plug is instantaneously reversed, and even the feed is blocked.

Tank truck air supply pneumatic transmission 1. Air source adjustment; 2 inflation valve; 3. Air supply valve; 4. Loading silo; 5. Tank truck 14 nylon pellet pneumatic conveying and nitrogen recovery system nylon pellet pneumatic conveying and nitrogen recovery system See tank truck pulse air knife type pneumatic conveying 1. air source adjustment; 2 air knife valve; 3. inflation valve; 4. loading silo; 5. tank truck it is by tank car storage tank and pulse air knife type plugging device Process of nylon slab conveying and nitrogen recovery system 1. Gas storage; 2 gas compression; 3. Gas dedusting; 4, 6, 7, silo; 5. Return gas pipe; 11. Gas source regulation; 12, 13. Nylon chips are easily oxidized, and nitrogen is required as a protective gas for transportation. Therefore, regardless of engineering investment or daily operating costs, nitrogen must be recycled and recycled to reduce production costs by consisting of two sets of pulse conveying devices. The former device will The dried nylon chips are transported to the intermediate silo, and the latter device sends the slicing from the intermediate silo to the silo in the upper part of the 9 spinning machines, feeding according to the non-high material level, time priority, and the lower level alarm The principle of priority is automatically switched, and the feed level gauge controls the feeding through the air supply valve.

After the nitrogen gas is transported, the tail gas is sent to the dust collector for filtration by the induced draft fan, and the air compressor presses the gas into the gas storage tank for recycling.

2 Conclusion The dense phase pulse pneumatic conveying technology has been promoted in the production of synthetic fibers for many years, and various devices have been put into operation for hundreds of sets. It has been proved that the domestically produced dense phase pulse pneumatic conveying device can fully achieve the conveying capacity of similar imported devices, and has a positive effect on the production management and management of enterprises and cost management.

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