According to the density of the particles in the pipeline, the ash-rich ash is divided into:
1 Dilute phase transport: The solids content is lower than 1-10kg/m3, the operating gas velocity is high (about 18-30m/s), and the transport distance is basically within 300m. In the case of the mature equipment material sealing pump, the conveying operation is simple without mechanical rotating parts, the conveying pressure is low, no maintenance, no maintenance!
2 dense phase transportation: solid content 10-30kg/m3 or solid-gas ratio greater than 25 delivery process. The operating air speed is low and it is pumped with a higher pressure. The equipment is now mature pump, transmission distance up to more than 500m, suitable for distance transmission, but this equipment more valves, pneumatic and electric equipment and more. High delivery pressure, wear-resistant materials are required for all pipes. Intermittent inflatable tank type dense phase transport. The granules are added into the pressure tank in batches, and then ventilated and blown loose. After the tank reaches a certain pressure, the discharge valve is opened and the particulate material is blown into the conveying pipe for transportation. Pulsed transmission is to pass a compressed air into the lower tank to loosen the material; another pulsed air with a frequency of 20-40 min-1 is blown into the inlet of the feed tube to form alternating columns of small columns in the pipeline. With small air columns, the air pressure is used to push forward.
3 Negative pressure conveying: The pressure in the pipeline is lower than atmospheric pressure, self-priming feeding, but it must be discharged under negative pressure, and the distance that can be transported is short; Advantages: Equipment investment, less load. Disadvantages: High operating flow rate, severe wear of the pipe, and wearable leaks are undetectable!
The positive-pressure dense-phase pneumatic conveying technology has the features of simple system, flexible layout, reliable operation, high degree of automation, low system investment, high ratio of transportation of grey gas, low flow velocity, small maintenance workload and low annual operating cost, and is well received by users. Welcome.
Positive pressure dense phase pneumatic conveying technology, according to various conditions and user needs, choose L-type pump static pressure plunger delivery system, T-type pump group pneumatic conveying system and NPD type pump dynamic pressure suspension pneumatic conveying system.
The feed valve of the pump provided by Gongyi Fucheng Machinery Factory adopts a gas-tight dome valve. The discharge valve adopts a unique pneumatic cylinder rotary valve (special technology), and the intake valve and level gauge of all pumps (transmitters). All imported equipment imported from abroad. FuCheng Pneumatic Conveying System can transport various loose material from fine powder, granular to massive, such as fly ash, desulfurization ash, circulating fluidized bed sand and bottom slag, limestone powder, pebble coal, coal-fired power plant, Quartz stone, soda ash and other materials.
The Gongyi Fucheng positive pressure dense phase pneumatic conveying technology has a suitable conveying distance of 50 to 1200 meters, in which the lifting height reaches 75 meters, the system conveying capacity can reach 250t/h, the low temperature of the conveying material site is -20 DEG, and the address "temperature is 450°C Ten characteristics of high density pneumatic conveying system
First, the system configuration is simple There are few rotating parts in the system, in which the feed valve and discharge valve are rotating parts, and there are no other auxiliary equipment; the instrument gas source and the transmission gas source are common; the ash hopper does not need to set the gasification device, gasification Fans and air heaters; flexible and variable operating modes, continuous operation and regular operation.
Second, the system than the high system of transport of gray gas using high-density low-pressure plug flow delivery, consume less compressed air can transport more material, transport gray ratio up to 80-100. Taking the delivery of pulverized coal from 100m away as an example, the ratio of transported ash can reach 80kg/kg.
Third, the transmission of low energy consumption Because the amount of compressed air required to transport the same amount of material is small, and the delivery pressure is low, so the transmission energy consumption is much lower than other forms of pneumatic conveying system.
Fourth, the system to send a low flow rate The system to send a low speed, with L-type pump as an example, the initial speed of 3m / s, not the speed of 7m / s.
Fifth, the pipeline wear is small due to the use of lower conveying speed, and the ductility of the pneumatic conveying pipeline is proportional to the delivery flow rate, and the low flow velocity of the pipeline will inevitably greatly reduce the pipeline wear.
Sixth, the system investment is few, the annual operation maintenance cost is low because the system configuration is concise, the equipment is few, the installation height of the electrostatic precipitator required is relatively low, therefore only needs the smaller investment. Because the equipment is reliable, maintenance and repair are less and the energy consumption of the system is low, the system can be safely and reliably operated at a low cost.
7. Feed valve adopts international advanced pneumatic dome valve. The valve has reliable structure, long service life, easy maintenance and maintenance, adopts the most advanced international airtight structure, and the valve core can be inflated without contact between the sealing rings when the valve is opened and closed. The ring is made of specially formulated rubber and guarantees a service life of up to 1 million cycles.
Eight, the discharge valve uses a unique pneumatic rotary valve valve structure is reliable, high precision machining, designed for plug flow pneumatic conveying system. Spool and pipe smooth transition, no change in curvature, suitable for flow in the dense phase plug flow, wear-resistant valve core, to ensure that the service life of 500,000 times. (Company-specific technology)
Nine, valve pneumatic actuator performance, long life, large thrust. Pneumatic actuator adopts a fully closed rotary push rod type straight cylinder drive to close the trajectory conversion and rotary output in the cavity. Even under severe working conditions, it will not cause internal leakage due to wear of the actuator seal. (Company-specific technology)
Tenth, the system control level high system control uses the advanced programmable controller (PIC), has the automatic control, the distant operation and the local manual control three control modes, under the normal situation uses the automatic control mode. The control system can realize the automation of the collection of operational data and fault signals, automatic analysis and fault judgment of the operating data, and classify and alarm the faults in the system. Typical structure and principle of pneumatic conveying system
The transmitter of the pneumatic conveying system produced by Fucheng City, Gongyi City conveys the material by embolization, and the ash hopper and the transmitter need no additional fluidization. System operation generally consists of five stages.
Stage 1: Reliable, high-strength dome valve closes the sender inlet
Stage 2: Conveying air into the transmitter for dense phase embolization
Stage 3: Conveying air to push ash plugs along the feeding duct
Phase 4: The applied air pressure is maintained until the ash plugs enter the ash store
Stage 5: Air entering the ash store is discharged through a bag filter
The entire operation process adopts automatic PLC control and manual local control. More content can visit Gongyi Fucheng pneumatic conveying material pump official website or telephone consultation!
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