Synthetic Ammonia Process Technology Exchange Area [Daily Question 2009-03-06]

I’m a beginner, so I’ll share what I know: air generation blowers generally have high pressure, large flow rates, low power consumption, and low noise levels. Boiler draft and supply fans generally have stable flow and pressure, with low noise levels. Desulfurization Roots blower: Roots blowers generally draw gas out of a system by creating negative pressure.

Gas generation blowers generally feature high pressure, large flow rate, low power consumption, and low noise. Boiler draft and supply fans generally have stable flow and pressure, with low noise levels.

Roots blowers – Direct-coupled and belt-driven types. Chinese: Roots blower; English: Roots blower. Types: Direct-coupled and belt-driven. Principle: Roots blowers are positive displacement rotary blowers that utilize two lobed rotors moving relative to each other within a cylinder to compress and convey gases. This type of compressor maintains the engagement between the two rotors through synchronous gears at the ends of the rotor shafts. Each recessed curved surface on the rotor, together with the inner wall of the cylinder, forms a working volume. As the rotor rotates, it draws in gas from the intake port; when it moves near the exhaust port and becomes connected to it, gas returning under higher pressure causes the pressure within the working volume to rise suddenly, after which the gas is sent to the exhaust passage. The two rotors operate in sequence, alternating with each other. The two rotors do not come into contact with each other; sealing is achieved through a tightly controlled gap between them, so the gas discharged is not contaminated by lubricating oil. 　　Structure: This blower features a simple structure and is easy to manufacture; it is suitable for gas transfer and pressurization in low-pressure applications, and can also be used as a vacuum pump. Due to the pulsations in airflow velocity and pressure caused by periodic suction and exhaust, as well as instantaneous isochoric compression, significant aerodynamic noise is generated. Furthermore, the gaps between the rotors and between the rotors and the cylinders can cause gas leakage, thereby reducing efficiency. The exhaust volume of the Roots blower ranges from 0.15 to 150 cubic meters per minute, with a rotation speed of 150 to 3000 revolutions per minute. The single-stage pressure ratio is usually less than 1.7, with a maximum of 2.1; it can be used in multiple stages in series. 　　Features: Its greatest advantage is that when the pressure is adjusted within the allowable range, the flow rate changes very little; it has a wide range of pressure options and features forced air delivery. The medium contains no oil during transportation. It features a simple structure, easy maintenance, a long service life, and low vibration of the entire unit. 　　Medium: The media transported by rotary vane blowers include clean air, clean kerosene, sulfur dioxide, and other inert gases. Thanks to these properties, they can be widely applied in the metallurgy, chemical engineering, fertilizer production, petrochemicals, instrumentation, and building materials industries.

Features of several types of blowers: 1. Gas generation blower: Answer – High pressure. 2. Boiler exhaust blower: Answer – Stable flow rate. 3. Desulfurization Roots blower: Answer – Negative pressure transmission

The pressure ratio of the gas generation blower is lower than that of the boiler blower and the Roots blower; their temperature requirements are not very high, usually at room temperature. The exhaust fan has a large airflow capacity, with a temperature generally not exceeding 150 degrees.