Gas pressurization fan

Gas booster fan (gas exhaust fan, DMZ/BMJ centrifugal gas booster fan) is a core safety equipment in metallurgy and gas stations, specialized in transporting and pressurizing combustible and toxic gases such as blast furnace gas, coke oven gas, converter gas, and generator gas, stabilizing the pressure of the pipeline network, and transporting them to gas equipment such as heating furnaces and boilers; The medium is flammable and explosive, containing corrosive components such as dust and hydrogen sulfide. Air tightness, explosion prevention, and anti-static are the first core indicators.

1、 Working principle

Centrifugal structure, impeller rotation works on gas to increase pressure and achieve long-distance transportation; The system is equipped with a reflux anti surge pipeline to avoid the danger zone of surge and ensure stable operation under low flow conditions.

Differentiation: The centrifugal gas booster fan has a wide range of flow regulation; Roots gas booster fans are commonly used in low flow, high-pressure conditions.

2、 Whole machine structure

Horizontal split steel plate welded casing+rear curved high-efficiency impeller+intake chamber+shaft end seal+bearing box+common base

1. Impeller: Rear curved blades, less prone to dust accumulation; Ordinary gas Q345, using 304 stainless steel for sulfur-containing corrosion conditions; Factory G4 high-precision dynamic balancing; Dust containing conditions can be used for wear-resistant welding.

2. Shaft seal (of utmost importance): labyrinth+carbon ring composite seal, high-pressure working condition with nitrogen blowing protection seal, blocking gas leakage to prevent air from infiltrating the casing and forming explosive mixed gas.

3. Bearing system: sliding bearings+thin oil lubrication, large units are equipped with thin oil stations and high-level oil tanks; Embedded temperature and vibration sensors for online monitoring of bearings.

4. The shell is equipped with a sewage outlet and a condensate discharge valve, which can regularly discharge tar and condensate produced from coal gas. Accessories: Explosion proof motor, gas specific fluororubber soft connection, spring shock absorber, imported regulating butterfly valve, explosion-proof electrical control cabinet, anti surge reflux pipeline, combustible gas alarm interlock

3、 Core Features

1. Strictly explosion-proof and anti-static: the whole machine is grounded, the explosion-proof motor Exd Ⅱ BT4, the shell and impeller are conductive to eliminate static sparks and prevent gas ignition.

2. Highly airtight design to prevent gas leakage and prevent air from being sucked back into the gas system (air mixing can easily cause explosions).

3. Equipped with anti surge system, reflux valve interlock protection, and fan protection during start-up, shutdown, and low load.

4. Variable frequency speed regulation, automatically adjusting pressure and flow according to gas load, stabilizing pipeline pressure.

5. Horizontal split casing, no need to disassemble inlet and outlet pipelines for rotor maintenance, easy to maintain.

6. Suitable for gas media containing tar, small amounts of dust, and hydrogen sulfide corrosion.

4、 Applicable scenarios

Gas generation station, metallurgical blast furnace/coke oven/converter gas recovery, steel rolling heating furnace, industrial boiler gas supply system.

5、 Key parameters for selection

1. Medium type: Generator/Blast Furnace/Coke Oven/Converter Gas; The medium contains dust, tar, and H ₂ S content

2. Air volume, pressure rise (outlet pressure)

3. Medium temperature (generally ≤ 70 ℃)

4. Do you need nitrogen sealing, thin oil station, and anti surge circuit

5. Explosion proof rating, online monitoring (vibration, temperature, flammable gas)

6. Adjustment method: imported butterfly valve/frequency converter

6、 Installation points

1. Gas specific fluororubber soft connections are used for import and export to isolate vibration and compensate for thermal displacement. Ordinary canvas soft connections are strictly prohibited.

2. The pipeline is independently supported, and the pipeline load shall not act on the fan flange.

3. The whole machine is reliably grounded, and the pipeline is equipped with static electricity jumper.

4. Equipped with a combustible gas detector, it will interlock and shut down in case of leakage; The anti surge reflux pipeline must be installed according to the design.

5. Before starting the machine, replace the nitrogen and exhaust the air inside. It is strictly prohibited to start the machine directly with air.

7、 Common faults

1. The impeller has accumulated tar and dust, the dynamic balance is unbalanced, and the vibration exceeds the standard

2. Shaft seal failure, gas leakage or air infiltration, major safety hazards

3. Surge: Pressure fluctuations in the pipeline network, intense noise, and severe shaking of the unit

4. Condensation water, tar deposition, corrosion of shell and impeller

5. Bearing oil shortage, oil temperature exceeding standard, interlock shutdown