Quench Column Quenching Tower For Petroleum Refining / Chemical Manufacturing

quenching tower

The function of the quenching tower is to quickly cool down the flue gas. The temperature of the flue gas coming out of the boiler is around 550°C. In order to avoid the regeneration of dioxin substances in the temperature range of 250°C to 400°C, the system must shorten the short residence time of the flue gas at this temperature as much as possible, so the system is set up with rapid cooling The spray tower is used to quickly cool down the flue gas. During the mixing and falling process of the water mist and flue gas, gasification is completed, and no sewage will be generated at the bottom.

A quenching tower, also known as a quench tower or cooling tower, is a device used in various industrial processes to rapidly cool hot gases or vapors. It is commonly employed in applications where it is essential to reduce the temperature of a gas or vapor stream quickly and efficiently.

The quench tower adopts the direct cooling method of spraying tap water. The flue gas flowing through the tower directly contacts the atomized liquid. The injected liquid quickly vaporizes and takes away a large amount of heat, and the flue gas temperature can be quickly reduced to 180°C. °C to avoid the regeneration of dioxins. The quenching tower can control the temperature of the flue gas entering the dust collector, and ensure the inlet temperature of the bag dust collector by controlling the amount of liquid spray to prevent the flue gas temperature from being too high and affecting the operation of the bag dust collector.

The general operation of a quenching tower involves the following steps:

Hot Gas Inlet: The hot gas or vapor stream enters the quenching tower through an inlet. This gas stream may be generated from processes such as combustion, thermal treatment, or chemical reactions, and it typically has a high temperature.

Quenching Medium Introduction: Inside the quenching tower, a cooling medium, often in the form of a liquid, is introduced into the gas stream. The cooling medium can be water, an aqueous solution, oil, or other suitable fluids depending on the specific application and process requirements.

Direct Contact Cooling: As the cooling medium is introduced into the gas stream, it comes into direct contact with the hot gases or vapors. This direct contact facilitates the transfer of heat from the gas stream to the cooling medium, resulting in rapid cooling.

Heat Transfer and Evaporation: The heat from the hot gas stream is transferred to the cooling medium, causing the temperature of the gas to decrease. In some cases, the cooling medium may absorb enough heat to vaporize partially or completely, leading to the evaporation of the cooling medium.

Cooling and Condensation: The cooling medium absorbs heat from the gas stream, causing the gas to cool down. This cooling process can lead to the condensation of certain components present in the gas stream, resulting in the formation of liquid droplets or mist.

Separation and Discharge: After the cooling process, the cooled gas stream exits the quenching tower through an outlet. Any condensed liquid droplets or mist are typically separated from the gas stream using demisters or other separation devices before the gas is discharged.

Quenching towers can be designed in various configurations, including vertical or horizontal arrangements, to accommodate the specific process requirements. The cooling medium flow rate, temperature, and contact time with the gas stream are crucial parameters that need to be controlled to achieve efficient cooling.

Quenching towers find applications in a wide range of industries, including petroleum refining, chemical manufacturing, power generation, and metallurgy. They are particularly useful in processes where the rapid cooling of hot gases or vapors is necessary to prevent undesired reactions, ensure equipment protection, or facilitate downstream process operations.