Working Principle of the Damping Tank in Batch-type Waste Tire Pyrolysis Equipment

Working Principle of the Damping Tank in Batch-type Waste Tire Pyrolysis Equipment

The working principle of the damping tank in batch-type waste tire pyrolysis equipment centers on volumetric buffering, pressure wave attenuation and flow velocity homogenization, and simultaneously achieves the secondary sedimentation of trace heavy oil droplets. Adapted to the working condition of drastic fluctuations in oil-gas flow and pressure in the batch process, it essentially forms an oil-gas pressure-stabilizing buffer space through its closed cavity to eliminate pressure pulsation in the pipeline and stabilize the feeding rhythm of the subsequent systems. It specifically consists of three core links:

Pressure Buffering and Pulsation Attenuation

The oil-gas output of batch pyrolysis shows a batch-wise variation of low flow → peak flow → low flow. After high-pressure oil-gas enters the damping tank, the oil-gas originally flowing rapidly in the pipeline instantly enters the large-volume closed cavity, and the high-pressure pulsation in the pipeline is absorbed by the static gas-phase space in the tank, which acts like a pressure-stabilizing air chamber to counteract the sudden pressure rise. When the gas production of the pyrolysis furnace decreases and the pipeline pressure drops, the high-pressure oil-gas stored in the tank is slowly released to supplement the pipeline pressure, prevent sudden pressure drop, realize the stabilization and constant of oil-gas pressure, and avoid pipeline vibration and seal leakage caused by drastic pressure fluctuations.

Forced Homogenization of Oil-gas Flow Velocity

The inlet pipe diameter of the damping tank is much smaller than the cross-section of the tank cavity. After oil-gas enters the tank, the flow cross-sectional area increases suddenly, leading to a sharp drop in oil-gas flow velocity (transforming from high-speed flow in the pipeline to low-speed diffusion in the tank). The oil-gas is then uniformly exported through the outlet pipe at the top of the tank, converting the original fluctuating oil-gas delivery rhythm into a continuous and stable low-speed flow, and preventing high-speed oil-gas from directly rushing into the condenser and causing material surging and heat exchange tube blockage.

Secondary Sedimentation of Trace Heavy Oil Droplets

The oil-gas after primary separation by the steam drum still carries a small amount of unsettled heavy oil droplets. As these droplets enter the damping tank with the oil-gas, their flow velocity drops sharply, leading to their separation from gaseous components under the action of gravity and slow sedimentation to the bottom of the damping tank, completing secondary oil removal. The settled heavy oil can be discharged regularly through the oil drain port at the bottom of the tank (or returned to the steam drum), avoiding trace heavy oil from entering the condensation system and further reducing the risk of condenser blockage.