Liquid Ring Vacuum Pumps of in Sugar Industry
As traditional agricultural processing industry, sugar industry is closely related to sugar plantation and mainly gathered in China provinces of Guangxi, Yunnan, Guangdong, Hainan, Xinjiang and Heilongjiang, becoming pillar industries of border and minority economy.
Main sugar making process
Cleaning, evaporation, and crystallization are key steps of the whole sugar process, and in each step,stable and effective vacuum system is required. Traditional piston pumps are high oil consumption, violent vibration and also several trouble spots. The later water jet pumps are low efficiency, high power and water consumption, and series pollution, what’s more they can not provide stable and efficient vacuum.
Water ring vacuum pumps replace traditional pumps with the following advantages:
1. Reduce water and pollution charge , with only 1/3 water consumption of water jet condenser (air ejector).
2. Compared with water jet condensers and reciprocating pumps, water ring vacuum pumps are designed with simple structure, replacement of components and lubricant filling are not necessary; high suction capacity, for fast vacuum resume (only a few minutes), and energy saving reaches 30%.
3. No components abrasion during operation, with no maintenance, possible for long-term trouble-free operation.
4. Easy to install and operate.
5. Acquisition of higher & more stable vacuum, available for vacuum in high altitude area. e.g. In China’s Yunnan Province (average height above sea level 2000m), under local pressure, vacuum degree reaches -0.085Mpa (gage pressure), which is fully meet the requirements for technology.
EVP pumps are widely used in sugar process of boiling, filtration, evaporation and CO2 gas compression.
Application
Application in vacuum filtering
Water ring vacuum pumps are suitable for both non-cloth vacuum filter and TGR type cloth vacuum filter, reaching the vacuum degree of higher than -0.08Mpa, and pol of filter mud lower than 6%, this greatly reduces the sugar loss of filter mud and increases recovery.
Application in last effect tank of evaporation
The key process of evaporation is discharging non-condensing gas, reducing hyperchromic and intensity of sulfitation. Both evaporation tank and cane juice are equipped with ammonia removal pipes to discharge non-condensing gas. Water ring vacuum pumps are better than jet condenser in pumping non-condensing gas, getting higher vacuum, accelerate tank passing speed, and reducing hyperchromic in evaporation, intensity of sulfitation, sulfur content of sugar, and yellowing of finished sugar in storage.
2BV series water ring vacuum pumps and closed cycle units are suitable to pump gas and vapor, suction pressure reaches 33mbar abs. When oil is used as operating liquid (oil ring vacuum pump), suction pressure reaches as high as 6.7mbar abs.(99.3% vacuum degree), and they can completely replace reciprocating vacuum pumps. 2BV series stainless steel vacuum pumps can be used on occasions asking for high anti-corrosion ability and cleanness.
Application in sugar boiling (crystallization) system
The main task of boiling is to concentrate syrup (or molasses) in the boiling tank to a certain supersaturation degree, separate out qualified crystals and puree into fine massecuit. After crystallization and mother liquid removal by centrifuge, fine crystal sugar is obtained.
The most important in this process is to ensure sufficient vacuum degree and stability for boiling and evaporation, and the main factor of stability is hot circulating water. Complete sets of vacuum system by Jinggong deals well with vacuum problems in boiling process, and are best way to cool down circulating water temperature effectively, this can fully meet the high vacuum requirement for boiling and evaporation, with no exception of troise (or boise-troise sugar ).
Compression and transportation of CO2 gas
For CO2 water ring vacuum pumps in carbonation method process, their discharge pressure reaches 0.12MPa(G), and highest 0.15MPa(G), suction capacity are optional from200-12000m³, with features of reliability, safety, stable operation, and lower cost, which is beyond comparison of other products.
---Quality gains market, integrity achieves brand---
According to the demand of high vacuum degree and pumped gas are corrosive, Jinggong has developed the products in many ways to improve stability and reliability of vacuum system in sugar plants.
All flow passage components are made in high-quality 304, and adopt several anti-corrosion methods, such as spaying, PTFE painting, and polymer material painting, enhancing anti-corrosion property of the whole pump.
Roots and side stiffener of impeller blades are high-temperature solid welded to improve blades strength, this will effectively prevent impeller crack caused by long operation in high vacuum.
The position of side stiffener is off with end face, which scrapes the foreign bodies between port plate and end face side, to prevent scaling of foreign body between impeller and port plate, and also wear of port plate.
Cavitation protection design inside vacuum pumps which used in evaporation and crystallization process avoids impeller crack due to long-term cavitation.
