At present, in the titanium dioxide industry, manufacturers have not fully understood the FRP crystallization equipment and the poor information transmission. The traditional vacuum crystallization equipment is basically made of the original imported carbon steel lining process. The disadvantage is that the lining colloid is repaired every few years. Due to the strong corrosiveness of the internal medium of the carbon steel crystallization tank equipment and the stirring device and the negative pressure, the use temperature of the rubber lining should not exceed 90 °C, otherwise the lining rubber and carbon steel substrate are prone to cracking and delamination. The FRP vacuum crystallizing tank made by Sino-Italian Composite Materials Co., Ltd. is the key equipment for the titanium white industry (the ferrous sulfate in the production of sulfuric acid titanium dioxide). It is the equipment parameter of the carbon steel-lined crystallizing tank of foreign titanium dioxide manufacturers for many years. According to the actual use situation of Guangxi titanium dioxide manufacturer, the all-glass steel crystallizing tank jointly developed by FRP forming and corrosive medium makes the crystallizing tank localized. The product adopts the latest international polymer vinyl synthetic resin, adopts the Italian Vetroresina imported production line, integrated molding lining, microcomputer control, glass fiber mechanical winding processing and molding of new glass fiber reinforced plastic crystallization equipment. Compared with carbon steel lining equipment, FRP crystallizer has the following advantages: 1. FRP crystallization tank has high strength, FRP crystallizer uses glass fiber E-galss high tension, multi-layer, multi-angle, multi-cutting point, enveloping head , the overall inflatable bag winding method. The FRP fiber winding container can reach a tensile strength of 300 KPa, and the strength ratio exceeds the tensile strength of the carbon steel. After reasonable design, the FRP crystallizer meets the need of vacuum pressure crystallization process of sulfuric acid titanium dioxide vacuum process 0.098Mpa, without worrying about being sucked or deformed. 2, acid and alkali resistance and chemical corrosion; FRP material can resist the long-term corrosion of various acids, alkalis, salts, organic solvents and chemical media such as seawater and sewage. Different properties of FRP materials can be selected according to different media categories and operating temperatures. In the vacuum crystallization process of titanium dioxide, the FRP material can withstand dilute sulfuric acid below 120 °C, no delamination and bagging phenomenon, and fully meet the corrosion requirements of metatitanic acid and ferrous sulfate in the process. Because during the use of the vacuum crystallizer, because the absolute pressure of evaporation, the boiling point of water will not reach 100 °C will boil, a large amount of moisture absorption latent heat volatilization is sucked away by the steam ejector, while the temperature of the titanium liquid will be reduced to 15 ° C - 20 ° C It is conducive to the next process. 3, FRP material is resistant to high temperature; At present, with the continuous introduction of new vinyl materials, the modified phenolic vinyl resin can reach the highest temperature and heat deformation up to 250 ° C, meeting the needs of the production technology of acid-decomposed tail gas chimney in the titanium dioxide industry; The temperature in the use of the device generally does not exceed 90 ° C, even if there is an operational error, the temperature exceeds 100 ° C, the FRP material can fully meet the temperature requirements, and does not appear as the carbon steel lining due to the short-term high temperature caused by the softening of the delamination. 4. FRP vacuum crystallizer has good compressive strength; FRP pressure vessel can reach 6.4Mpa after reasonable design, and its strength can be comparable with carbon steel and stainless steel. In aerospace technology, many components and equipment for space shuttles and spacecraft are made of FRP composites. FRP can be designed as a positive pressure or negative pressure container. The working pressure in the vacuum crystallization of titanium dioxide industry is about -0.98Mpa, and the design pressure of FRP is 0.1Mpa, which meets the needs of vacuum crystallization of sulfuric acid titanium dioxide. 5. FRP vacuum crystallizer is anti-aging and has a long service life; the life of ordinary FRP products is 30-50 years, which is slightly reduced under the harsh environment and complicated working conditions. In the vacuum crystallization process, since it is vacuum evaporation crystallization, the temperature is about 60 ° C, and the corrosion resistance to the equipment is greatly reduced compared with the normal pressure state. It is also more extensive in the selection of materials, creating conditions for the FRP mold to reduce the cost. The service life of FRP vacuum crystallizer is more than 10 years. At present, Guangxi Tengxian Titanium Dioxide Enterprise has been used for nearly 5 years. During the overhaul of the enterprise, it has been found that there is no tank corrosion and cracking stratification in the tank. In 2011, the company is optimistic about the advantages of FRP crystallizers. In order to increase production, a DN3600mm FRP vacuum crystallizer is added to increase the production. The use of two FRP crystallizing tanks has not received any bad feedback from users. Regular visits to customers to check the customer's use of FRP crystallizing tanks, in order to better understand the titanium dioxide sulfuric acid crystallization process and improve the use of FRP crystallizing tanks.

This is about Centrifugal Fan

 Centrifugal fan is to rely on the input of mechanical energy, increase gas pressure and send gas machine, it is a kind of driven fluid machinery. Centrifugal fans are widely used in ventilation, exhaust and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and draft in boilers and industrial furnaces; cooling in air conditioning and domestic appliances and Ventilation; grain drying and selection; wind tunnel source and hovercraft inflatable and propulsion.

Centrifugal fan works with turbine compressor basically the same, are due to the gas flow rate is low, little pressure change, generally do not need to consider the gas volume change, that is, the gas as incompressible fluid treatment.

 

Centrifugal fan can be made of right-handed and left-handed two types. Faced from the motor side: impeller clockwise rotation, known as the right rotary fan; impeller counterclockwise rotation, known as the left rotary fan.

Centrifugal fan from the chassis, spindle, impeller, bearing and motor drive and other components.

Chassis: made of steel sturdy and reliable, can be sub-integral and semi-open, semi-open for easy maintenance.

Impeller: the blade, curved front plate and plate rear plate composition.

Rotor: Static and dynamic balance should be done to ensure smooth rotation, good performance.

Transmission parts: a spindle, bearing boxes, rolling bearings and pulleys (or coupling) composition

Features

1. Compact structure: beautiful appearance, good stability, easy installation and maintenance.

2. Smooth operation: Optimized design of the impeller to reduce the axial force to a minimum, and efficient impeller, and static and dynamic balance correction, the machine running smoothly, without any damping device in the case of bearings Amplitude ≤0.04mm.

3. Low noise: blower operation, without any mechanical friction, the use of a reasonable blade-shaped line to the sound to a minimum. Centrifugal blower noise is high-frequency noise, as long as there are obstacles, can be noise, so the fan room almost no noise.

4. Oil-free machinery: Blower bearings with grease lubrication, bearing life of more than three years. Fan does not generate oil and gas during operation. Special requirements fans, with molybdenum disulfide lithium grease lubrication bearings.

5. Impeller: Impeller with a special compound linear, reducing internal leakage and improve the volumetric efficiency.

6 easy to adjust: the inlet valve to regulate flow, the outlet valve to regulate the pressure.

7. Drive: usually using a two-pole asynchronous motor, you can also use four-pole motor drive. Depending on the user grid, different voltage motors can be used.

8. Sealing: In addition to each level of import impeller impeller, the interstage and the housing at both ends with a labyrinth seal to prevent gas leaks.

9. Cooling: exhaust bearing housing has two structures, air-cooled and water-cooled, as the impeller on the level of gas compression, resulting in the exhaust casing temperature is much higher than the intake casing. In the exhaust bearing air-cooled or water-cooled device to extend the bearing life.

10. Bearing temperature control alarm: fan accessories with temperature control box, connected to the bearing through the PT100 resistance, when the bearing temperature exceeds the set temperature, the temperature control box will automatically alarm.

11. Transmission: a coupling drive, belt drive, gearbox drive three. According to different equipment and technology, choose a different transmission

if you have any questions,please contact with us directly.AC axial fan are produced by Aluminum Alloy and PBT+30%GF impeller.Welcome visiting our Factory or sending mail directly to inquiry us.

Centrifugal Fan

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