Roots blower is a type of volumetric gas conveying equipment that is widely used in the industrial field due to its simple structure, stable flow rate, and wear resistance. The following are its core usage classifications and typical application scenarios:
---
**1、 Environmental Protection and Sewage Treatment**
1. * * Sewage aeration**
-Function: Inject oxygen into the biochemical tanks of activated sludge and SBR processes to promote microbial degradation of organic matter.
-* * Features * *: Requires corrosion-resistant material (such as stainless steel 316L), flow range of 10-300 m3/min, pressure of 49-78 kPa.
-* * Case * *: The aeration system of a municipal sewage treatment plant operates continuously for 24 hours.
2. * * desulfurization and denitrification**
-Function: Forcefully inject oxidizing air into the desulfurization tower of power plants/steel plants to convert sulfite into sulfate (gypsum).
---
**2、 Chemical and petroleum industries**
1. * * Pneumatic conveying**
-* * Purpose * *: Conveying powders (such as PVC, calcium carbonate) and granules (such as fertilizers, grains).
-* * Features * *: Wear resistant impeller (tungsten carbide coating), explosion-proof motor (Ex d Ⅱ BT4).
-* * Case * *: Polypropylene powder conveying in a chemical plant, pressure 58 kPa.
2. * * Gas supply for reaction kettle**
-Purpose: To provide inert gas (nitrogen) or reactive gas (chlorine) for chemical reactions.
---
**3、 Power industry (mainly coal-fired power plants)**
1. * * Pneumatic ash conveying**
-Purpose: To transport the fly ash collected by the electrostatic precipitator through pipelines to the ash silo.
-* * Features * *: High pressure type (78-98 kPa), wear-resistant shell.
2. * * Flue gas recirculation**
-Purpose: To lower the combustion temperature of boilers and reduce NOx emissions (requiring high-temperature resistant design).
---
**4、 Metallurgy and Casting**
1. Blast furnace coal injection**
-Purpose: Inject coal powder into the blast furnace to replace coke, with a pressure of ≥ 98 kPa.
2. * * Melting and degassing**
-Purpose: To remove hydrogen gas from aluminum liquid and prevent casting porosity.
---
**5、 Food and Medicine**
1. Fermentation oxygen supply**
-Usage: Beer, soy sauce, fermentation (requires oil-free and sterile air).
2. * * Vacuum packaging**
-Purpose: Vacuum packaging for food and medicine, with a maximum vacuum of -80 kPa.
---
**6、 Other industry applications**
|* * Industry * * | * * Purpose * * | * * Special Requirements * *|
|------------|--------------------------|-------------------------|
|* * Papermaking * * | Pulp bleaching gas supply | Chlorine gas corrosion resistance|
|* * Cement * * | Raw material homogenization silo fluidization | Wear resistant impeller (C ≥ 60)|
|Aquaculture * * | Fish pond oxygenation | Low noise (≤ 75dB)|
|* * Electronics * * | PCB board drying | Clean oil-free air|
---
**7、 Special purpose**
1. * * Vacuum system**
-As a vacuum pump, it is used for material suction and filtration (requiring a front-end pump to increase the vacuum degree).
2. * * Fire smoke exhaust**
-Emergency smoke exhaust (temperature resistance above 300 ℃, explosion-proof certification required).
---
**Key parameters for selection**
1. * * Flow rate * * (m3/min): According to process requirements+10 margins.
2. * * Pressure * * (kPa): system resistance+medium resistance (such as liquid column height).
3. * * Medium * *: Stainless steel is selected for corrosive gases, and wear-resistant design is selected for dust.
---
**Advantages and limitations**
-Advantages: Stable traffic, easy maintenance, and dust resistance.
-Limitations: Low efficiency (50-70), multiple levels of series connection are required in high-voltage scenarios.
When selecting Roots blowers for use in the three major fields of wastewater treatment, chemical engineering, and electricity, it is necessary to consider the characteristics of the medium and the operating pressure.
