月度归档：11 月 2024

Powder pneumatic conveying equipment

• Pneumatic powder conveying equipment is a type of equipment that uses airflow to convey powdery materials. It has the advantages of high efficiency, cleanliness, and flexibility.

Basic principles

• Air conveying: Using air flow generated by compressed air or vacuum as a power source. The material moves in the pipeline in a suspended or plugged state.

Classification:

• According to the installation method, it is divided into positive pressure conveying system and negative pressure conveying system.
• According to the conveying distance, it is divided into long-distance conveying and short-distance conveying.
• According to the air source, it can be divided into compressed air transportation and vacuum transportation.

Main types

• Pneumatic conveying system of warehouse pump: compact structure, suitable for medium and short distance conveying. It has high conveying efficiency and reliability.
• Spiral pneumatic conveyor: uses the thrust generated by the rotation of the spiral blades to transport materials. Suitable for occasions with small horizontal or tilt angles.
• Venturi pneumatic conveying device: uses the Venturi effect to generate high-speed airflow to suck in materials. The equipment is simple and the energy consumption is low.
• Roots blower pneumatic conveying system: Use Roots blower to provide stable air flow pressure. Suitable for large flow and long distance transportation tasks.
• Vacuum suction system: Create a negative pressure environment at the receiving end to attract materials into the pipeline. Often used in situations that are prone to clogging or have hygiene requirements.

Application areas

• Chemical industry: carbon black, pigments, dyes, etc.
• Building materials: cement, gypsum, limestone powder, etc.
• Food processing: milk powder, coffee powder, granular food, etc.
• Metallurgical minerals: ore powder, coal powder, etc.
• Pharmaceutical industry: packaging and transportation of pharmaceutical raw materials and finished products.

advantage

• Efficient and energy-saving: more energy-saving than traditional mechanical conveying methods.
• Clean and environmentally friendly: The closed pipeline design prevents dust leakage from polluting the environment.
• High degree of automation: easy to implement remote monitoring and automated operations.
• Good flexibility: the transportation route and destination can be changed according to needs.
• Easy maintenance: simple structure and easy replacement of parts.

Things to note

• The characteristics of materials and working conditions must be fully considered during design.
• Regular inspection and maintenance to ensure long-term stable operation.
• Comply with relevant safety regulations and operating procedures.

Principle of powder pneumatic conveying equipment

• The principle of powder pneumatic conveying equipment is to use the energy of air flow to transport powder materials in the direction of air flow in a closed pipeline. This equipment usually consists of a material receiver, a conveyor pipe, an air duct, a separator, an air lock and a fan. The function of the material receiver is to enter the material, resulting in a suitable material-to-air ratio, so that the material can start and accelerate; the function of the separator is to separate the material from the air, and to sort the material; the air lock is used to uniformly supply or unload materials , while preventing air from leaking in; the fan provides power to the system.
• ‌The application scenarios of powder pneumatic conveying equipment‌ are very wide, including cement plants, alumina plants, thermal power plants, etc. It is suitable for transporting cement raw meal powder, alumina powder, fly ash and other powder particles. This equipment has the characteristics of simple structure, convenient operation, and can be transported over long distances. During the transportation process, it can simultaneously perform physical operations such as heating, cooling, and drying of materials.

The role of powder pneumatic conveying equipment

• Powder pneumatic conveying equipment is mainly used to transport powdery or granular materials. It has the following main functions:
• ‌Good dust-proof effect‌: During the transportation process, powder pneumatic conveying equipment can effectively prevent dust from flying and reduce environmental pollution.
• ‌Facilitates mechanization and automation‌: This equipment can reduce labor intensity, save manpower, and facilitate mechanization and automation operations.
• ‌Multiple process operations‌: During the transportation process, multiple process operations such as mixing, crushing, sorting, drying, and cooling can be performed simultaneously.

Application scenarios of powder pneumatic conveying equipment

• Powder pneumatic conveying equipment is widely used in the following industries and scenarios:
• ‌‌Casting, ‌Chemical industry, ‌Pharmaceutical, ‌Grain industry‌: Suitable for conveying particles and powder materials that are not easily broken.
• ‌‌Textile, ‌food, ‌electronics, ‌plastics, medicine, ‌packaging and other industries‌: used for pneumatic pipeline transportation of lightweight materials.
• ‌Lithium-ion battery industry‌: used in the production and processing of positive and negative electrode materials, with the characteristics of high automation and clean production.

What is the maximum height that powder pneumatic conveying equipment can convey?

• In practical applications, the height of negative pressure pneumatic conveying depends on many factors, including material properties, conveying distance, diameter of conveying pipes, air flow speed, etc. For lighter materials, such as cement, lime, etc., the conveying height of negative pressure pneumatic conveying can reach 50 meters or even higher. But for heavier materials, such as calcium powder, boiler ash, etc., due to their high density, the conveying height is usually about 10-15 meters.
• It should be noted that the higher the conveying height, the higher the requirements for conveying air flow. The conveying resistance increases, and the flow and pressure of compressed air need to be increased. This will not only increase energy consumption, but also increase equipment costs. Therefore, in practical applications, factors such as material properties, conveying distance, and pipe diameter need to be comprehensively considered to determine the appropriate conveying height and conveying method to achieve energy-saving conveying.

High voltage pulse dust collector

• Institutional principles
• The dust collector is divided into four parts: the upper box, the middle box, the lower box and the injection system. There is a flower board isolation between the upper box and the middle box, making the upper box a clean air chamber and the middle box It is a dust chamber with bags installed on the ceiling. When the dusty gas in the dust bin enters the dust air chamber of the middle box, the dust is blocked on the outside of the bag, and the filtered air enters the clean air chamber of the upper box and is then discharged into the atmosphere through the outlet.
• As the operation continues, the dust attached to the bag accumulates more and more. The longer the time, the greater the resistance of the bag, the smaller the exhaust volume, which will affect the normal operation of the dust collector. For this reason, we designed a pulse reaction system. Dust blowing system. The pulse backflush cleaning system is controlled by a pulse controller. The dust on the outer surface of the bag is regularly cleaned. The dust cleaning is done round by round, so the normal operation of the dust collector is not affected during dust cleaning. The dust swept down by dust cleaning falls directly into the dust bin, and no special staff is required. The dust removal work of the dust collector.
• According to the design requirements of the dust removal system, the dust collector must also be equipped with a fan to force the ash warehouse to exhaust and reduce the pressure in the ash warehouse, thereby ensuring the safety of the ash warehouse.

Working principle

• The compressed air flow ejected from the blow hole attracts the surrounding air and sprays it into the venturi tube and then enters the bag. Due to the sudden expansion of the gas, the bag vibrates and the gas passes rapidly from the inside of the bag to the outside of the bag, causing the adhesion to the bag. The dust on the surface of the bag breaks away from the bag.

High voltage pulse dust collector

Main features

• 1.The dust removal efficiency is high, generally above 99%. The dust concentration in the gas at the outlet of the dust collector is within 10 mg/N㎡’, and it has a high classification efficiency for fine dust with sub-micron particle size.
• 2.The processing air volume range is wide, the small one is only a few m’ per minute, and the large one can reach tens of thousands of m’ per minute.
• 3.Simple structure, easy maintenance and operation.
• 4.On the premise of ensuring the same high dust removal efficiency, the cost is lower than that of the electrostatic precipitator.
• 5.When using high temperature resistant filter materials such as glass fiber and polytetrafluoroethylene, it can operate under high temperature conditions of 200~250℃.
• 6.Insensitive to the characteristics of dust and not affected by dust and resistance.

Components

• Upper box: composed of a liftable cover and an air outlet;
• Middle box: composed of flower board and filter bag device;
• Lower box: composed of air inlet and ash hopper (TBLMY series only) Injection system: composed of pulse controller, solenoid valve, injection pipe air storage bag, etc.
• Filter bag: filters dust and discharges clean gas.
• Cage bone: fixes the filter bag and allows the filter bag to filter the largest area. Flower board: fixes the filter bag and keel, and divides the dust collector into two parts (i.e. upper box and middle box).
• Flower board: fix the filter bag and keel, and divide the dust collector into two parts (i.e. upper box and middle box)
• Blow pipe: There is a nozzle hole on the wall of the pipe, and the compressed air enters the bag through the nozzle hole. Centrifugal fan: discharges the filtered air into the atmosphere.
• Air pipe: used to transport compressed air into the jet pipe
• Solenoid valve: It is a switch that injects compressed air into the filter bag and is controlled by the output signal of the pulse meter.
• Air storage bag: used to store compressed air source.
• Pulse controller: used to control pulse injection time, pulse interval time and automatically control the injection sequence of each row of bags.

Rotary feeder working principle

• The working principle of the rotary feeder is to make the rotor with blades rotate in the cylindrical casing through the transmission of the motor and reducer, thereby realizing the transportation and unloading of materials. ‌Material falls from the upper hopper and fills the space between the blades. As the blades rotate, they reach the lower part and are discharged. Rotary feeders are usually equipped with a pressure equalizing exhaust port to reduce the phenomenon of gas ejection and ensure the smooth fall of materials. This equipment plays a role in uniform and continuous feeding of materials in the pneumatic conveying system, and has the functions of unloading and air locking in the separation and dust collection parts of the system.
• The structure of the rotary feeder includes a rotor with several blades, a casing, a seal, a reducer, a motor, etc. It has reliable operation, low noise, few failures and long life, and is suitable for dust removal, metallurgy, building materials, chemical industry, food and other industries. According to different usage environments, rotary feeders can also be divided into standard, high-pressure, high-temperature, wear-resistant, anti-jamming and electric types to meet different work needs.

The purpose of the rotary feeder

• Grain processing‌: Transport barley, malt, etc. in the malt workshop and brewing workshop of the brewery.
• ‌Chemical Raw Materials‌: Widely used in the transportation and measurement of chemical raw materials.
• ‌Plastic Metallurgy‌: Used for material transport in the plastics and metallurgical industries.
• ‌Energy and Mining‌: It is also widely used in the fields of energy and mining‌.
• ‌Building Materials Cement‌: Used for the transportation and measurement of materials in the building materials and cement industries.
• ‌Terminal‌: Used for the transportation of bulk materials in the terminal industry.

Technical parameters of rotary feeder

• ‌Feeding capacity‌: Feeding capacity per hour (t/h), converted to cubic meters per hour (m³/h) of the rotary valve.
• ‌Pressure difference‌: The working pressure difference (kPa) between the upper and lower flanges when ensuring the feeding performance of the rotary valve.
• ‌Temperature‌: The temperature of the medium material in the rotary feeder. Different temperatures determine the gap setting of the rotary valve. When the temperature is higher than the environment, measures such as heat preservation and heating should be considered.
• ‌Gas leakage‌: The amount of gas leakage through the gap between the rotor and the shell when the feeder has a pressure difference (m³/h).
• Speed‌: The number of revolutions of the rotor per minute (RPM).
• ‌Filling coefficient‌: Volumetric efficiency without pressure difference, related to the geometric size, shape and material characteristics of the rotary feeder.
• ‌Wear resistance‌: The characteristics of the material itself affect the degree of wear of the casing and rotor of the rotary valve pneumatic conveying project. Wear-resistant feeders should be used for materials with high wear resistance.

Main features of rotary feeder

• As feeders, rotary feeders are widely used. In the suction-type pneumatic conveying system, it is used for unloading and ash discharge at the lower part of the separator and dust collector; in the pressure-feeding pneumatic conveying system, it is used for feeding materials at the beginning of the conveying end.
• Simple structure, easy to use and maintain:
• Compact structure, small dimensions, and small installation space:
• By adjusting its rotational speed, it is easy to change the feeding amount:
• As the material changes and the amount of material stored in the upper separator changes, the discharge amount changes very little:
• Has a certain degree of air tightness:
• Almost no damage to the transported materials:
• Materials can be transported when the temperature is <500°C.
• Generally, it is suitable for powdery granular materials and small lump materials with good fluidity and low grindability.

Roots rotary lobe blower manual

• Precautions when using Roots blower:
• All parts of the fan should be comprehensively inspected to see whether the parts are complete, the tightness of the connection of each bolt and nut, the installation quality of each fastener and positioning pin, the installation quality of the intake and exhaust pipes and valves, etc.
• In order to ensure the safe operation of the blower, no external loads such as pipes, valves, frames, etc. are allowed to be carried.
• Check the centering and alignment quality of the blower and motor.
• 
• Check whether the base of the unit is fully padded and whether the anchor bolts are tight.
• Inject the specified grade of mechanical oil into the oil tank to the oil level line. The lubricating oil grade is N220 medium-load working gear oil.
• Check whether the motor steering meets the pointing requirements.
• A belt cover (protective cover) should be installed at the pulley (coupling) to ensure safe operation.
• Open all the blower inlet and exhaust valves, and rotate the fan rotor. It should rotate flexibly without impact or friction. Only after confirming that everything is normal can the fan be started for trial operation.
• No-load test operation of the blower.
  ⑴ Newly installed or overhauled fans should undergo no-load test operation.
  ⑵The concept of no-load operation of Roots blower is to put it into operation with the intake and exhaust valves fully open.
  ⑶ There is no abnormal smell, smoke, collision or friction sound, and the radial vibration speed of the bearing part is not greater than 6.3mm/s.
  ⑷ Run without load for about 30 minutes. If the situation is normal, it can be put into operation with load. If abnormal operation is found, it is still necessary to conduct a test run with no load after inspection and elimination.
• roots rotary lobe blower manual
• 
• The blower operates normally under load.
  ⑴ It is required to adjust gradually and slowly, and bring the load up to the rated load. It is not allowed to adjust to the rated load at one time.
  ⑵The so-called rated load refers to the static pressure difference between the inlet and exhaust ports, according to the calibrated pressure value on the nameplate. When the exhaust port pressure is normal, attention must be paid to the pressure changes at the air inlet to avoid overloading.
  ⑶ During normal operation of the fan, it is strictly forbidden to completely close the inlet and exhaust valves. Pay attention to regularly observing the pressure to see whether the safety valve operates to exhaust when overloaded. Otherwise, the safety valve should be adjusted in time to avoid overload operation.
  ⑷Due to the characteristics of the Roots blower, the gas from the exhaust port is not allowed to flow directly back into the air inlet of the blower for a long time (changing the temperature of the automatic lubricating oil inlet port), otherwise it will definitely affect the safety of the machine. If necessary If backflow regulation is used, cooling measures must be taken.
  ⑸ Always pay attention to the oil level of the lubricating oil, check regularly, and make records to ensure the oil level. The equipment maintenance of Roots blower can be carried out by automatically injecting lubricating oil.
• Parking
  The blower should not be stopped suddenly when it is fully loaded. It must be gradually unloaded before stopping to avoid damaging the machine. Regarding the emergency stop principle, the user can formulate separate detailed rules.
• The safe operation and service life of the blower depend on correct and frequent maintenance and care, and attention should be paid to the signs of any accidents. In addition to paying attention to general maintenance regulations, the following points should be paid attention to.

How does a roots rotary lobe blower work?

• Roots blower consists of two gear rotors and a shell that mesh with each other. One gear rotor is the stator and the other gear rotor is the rotor.
• When the rotor rotates, the gas is sucked into the air inlet of the Roots blower and pushed into the compression chamber between the gear rotors. The exhaust port discharges compressed gas from the compression chamber and pushes the object forward.
• As the rotor and stator rotate, the compression chamber with decreasing volume moves to the exhaust side, and the gas is continuously compressed and then discharged.
• The gear rotor rotates to the new air inlet position, the new compression chamber begins to compress the gas, and the compressed gas moves forward and is discharged.
• This movement process continues, creating air flow to push the gas forward. In this way, the Roots blower achieves the purpose of compressing and discharging gas by removing the volume of the gas compression chamber.

What is an sewage aeration fan?

• An sewage ‌aeration fan‌ is a device used to force gas into a body of water or liquid. It uses high-pressure fans or blowers to force air or other gases into water or liquid through conveying equipment and diffusion equipment. This process is called blast aeration.

Working principle

• The working principle of an sewage aeration fan is to blow air into the water body through a high-speed rotating impeller. Under the action of centrifugal force and inertia, the air at the outlet of the impeller acquires sufficient kinetic energy and potential energy to radiate and diffuse in the direction perpendicular to the pump axis. At the same time, longitudinal stirring and mixing occur between the air and the water body, causing the dissolved oxygen in the water body to rapidly increase.

What is the purpose of the aeration blower?

• ‌The main uses of aeration blowers include the following aspects‌:
• ‌Water treatment and sewage treatment‌: Aeration blowers purify water quality by blowing air into the water to form bubbles, provide sufficient oxygen, and promote the respiration and metabolism of aquatic organisms.
• During the water treatment process, the aeration blower can increase the concentration of dissolved oxygen in the water, helping harmful organisms in the sewage to be oxidized, degraded or adsorbed, thereby achieving the purpose of purifying water quality.
• ‌Sludge Treatment‌: In sludge treatment systems, aeration blowers are used for aeration and mixing. It can provide sufficient oxygen supply to the bacteria in the sludge, promote the anaerobic degradation of the sludge to produce methane and other useful substances, and volatilize harmful gases, thereby achieving the purpose of purifying the sludge.
• ‌Industrial wastewater treatment‌: The combination of aeration blowers and bioreactors can efficiently treat industrial wastewater, reduce harmful components in wastewater, and protect the environment and human health‌.
• ‌Aquaculture‌: In aquaculture, aeration blowers provide oxygen to the breeding pond to meet the oxygen demand of aquaculture and increase the growth rate and yield of aquatic organisms.
• ‌Biological fermentation‌: In the field of biological fermentation, aeration blowers are used for stirring and oxidation, promoting the oxidation of organic matter and the removal of harmful gases, improving fermentation efficiency and ensuring product quality‌.

What blowers are used in wastewater treatment?

• Commonly used types of blowers in sewage treatment include Roots blowers, multi-stage centrifugal fans, single-stage high-speed centrifugal fans, air suspension blowers and magnetic suspension blowers, etc.‌. Each of these fans has advantages and disadvantages and is suitable for different process needs.

Advantages and disadvantages of various types of blowers

• ‌Roots blower‌: It is cheap, simple in structure and stable in performance. However, it has low efficiency, high energy consumption and loud noise under high aeration pressure, so it is gradually being eliminated.
• Multi-stage centrifugal fan‌: The efficiency is slightly higher, but the flow rate changes greatly when the wind pressure changes, and the use is gradually reduced.
• ‌Single-stage high-speed centrifugal fan‌: large air volume and high efficiency, but consumes a lot of energy and makes a lot of noise‌.
• ‌Air suspension blower and magnetic suspension blower‌: high efficiency, low friction resistance, low noise, low maintenance, and gradually expanding market share.

What is roots air blower?

• Roots air blower is a positive displacement fan, also known as Roots blower or Ruthen blower. ‌It uses two leaf-shaped rotors to make relative motion in the cylinder to compress and transport gas. It has a simple structure and is easy to manufacture. It is widely used in low-pressure gas applications such as aquaculture oxygenation, sewage treatment aeration, and cement transportation. Conveying and pressurizing systems, can also be used as vacuum pumps, etc.

Working principle

• The working principle of a Roots blower is to transport gas through the change in the volume of the working chamber formed when two rotors with an involute or similar shape rotate. Each rotor is functionally equivalent to a gear with two teeth. The end face of the impeller, the front and rear end covers of the fan, and the gas in the cylinder work together to achieve gas compression and transportation.

Main features

• ‌The impeller rotates without friction‌: The impeller of the Roots blower has no friction during operation and does not require lubrication.
• High efficiency and energy saving‌: The L-type Roots blower is a high-efficiency and energy-saving blower with a flow rate from 0.37-1000m³/min and a pressure rise up to 98KPa. It has strong passability of parts, high degree of standardization, reasonable structure, high efficiency and easy use. Steady and reliable.

How do roots air blowers work?

• Roots blower is a commonly used compressed air equipment. Its working principle is mainly realized by two counter-rotating Roots drums.
• The two Roots drums are connected through gear transmission or belt transmission.
• Each Roots drum is supported by a central bearing and has toothed blades at both ends of the bearing.
• When the Roots blower is running, the two Roots drums rotate in opposite directions, and the toothed blades mesh with each other.
• As the Roots drum rotates, the toothed blades gradually leave the suction side and move toward the exhaust side, forming a closed ‌ Sealed chamber.
• When the toothed blade moves from the suction side to the exhaust side, the volume in the sealed chamber gradually decreases, and the gas is compressed and gradually discharged in the high-pressure area.
• At the same time, during the exhaust stage, new gas enters the suction side through the inlet to prepare for the next round of compression and exhaust.

Structural features of Roots blower

• The structure of Roots blower mainly includes shaft, impeller and bearing. Its parts have strong passability, high degree of standardization, reasonable structure, high efficiency, and safe and reliable use. It is convenient for users to select, install and maintain equipment and spare parts. Its performance covers a wide range of flow rates from 0.37-1000m³/min, and the pressure rise can reach up to 98KPa.

Roots blower company

• Since its establishment in the early 1990s, Longgu Heavy Industry has become a diversified machinery enterprise integrating fan and pneumatic conveying equipment system engineering.
• Our company has advanced computer-aided design and manufacturing, CNC machining technology, and adopts information technologies such as computer-aided design and CAPPCT to improve product design and manufacturing accuracy and shorten the design and manufacturing cycle.
• Shandong Longgu Heavy Industry Machinery Co., Ltd. has imported advanced and high-precision machining equipment from many countries, including fully automatic machining centers, CNC boring and milling machines, and dynamic balancing instruments. It has a high-level, large-scale, and modern mechanical processing and manufacturing workshop.
• The company has completed the implementation and control of its internal quality management system, achieving independent quality control of products from research and development design to finished product delivery.
• It has established and improved a full process self-control system from design and production to quality, installation, and service, providing sufficient basis and reliable guarantee for the stability and durability of products.
• We have cooperated with higher education institutions such as Shandong University, Shandong University of Technology, and Southwest University of Technology to strengthen the research and development of key core technologies.
• We have overcome technical difficulties and developed new products such as diesel engine driven Roots blowers, water-cooled dual tank Roots blowers, and low-noise Roots blowers, filling multiple industry gaps.
• At present, our company's main products include LGSR three leaf Roots blower, LGSR-V Roots vacuum pump, LGSR-H high-pressure blower series, bipolar series high-pressure, gas pressurized explosion-proof, pneumatic conveying series fans, steam compressors, LGMJ dense series fans, rotary fans, centrifugal fans, etc.
• Our company's products are widely used in industries such as sewage treatment, pneumatic conveying, vacuum packaging, grain processing, electricity, petrochemicals, cement, mining, and special gas pressurized conveying.
• We have close cooperative relationships with top domestic enterprises such as Sande Group, COFCO Group, and Shanshui Cement. Our company's sales outlets and after-sales service centers are located throughout the country and exported to countries such as Malaysia, India, Kyrgyzstan, Nigeria, etc.

Roots blower diagram