On-line plugging method for debenzolization tower

Abstract

The invention discloses an online plugging method for a debenzolization tower. The online plugging method comprises the steps of dismounting a heat preservation and insulation layer of a leakage part, manufacturing a plugging tool, preparing materials and tools, reducing the pressure and the temperature of the debenzolization tower, performing plugging treatment on the leakage part in a temporary 'plugging under pressure' mode, cleaning the leakage part, installing and fixing the plugging tool, performing online pouring, raising the temperature, increasing the pressure and the like. According to the online plugging method for the debenzolization tower, the debenzolization tower can be subjected to plugging under the condition that a crude benzene device does not stop production; the problem that the castable is difficult to fix can be solved through the self-designed tool; and the castable prepared according to the specific proportion can well solve the problem that cracks are generated between a tower ring and the castable due to thermal expansion and cold contraction caused by temperature change of a common castable.

Description

technical field [0001] The invention relates to a method for recovering chemical products in a coking plant, in particular to an online plugging method for a debenzene tower. Background technique [0002] The benzene removal tower is a commonly used distillation equipment in the "oil washing and absorption of crude benzene method" in the chemical production recovery process of each coking plant, and it belongs to the desorption tower. The debenzene tower is a device that allows the benzene group dissolved in the oil washing solvent to evaporate and release through the direct contact heat transfer of the heat carrier. The superheated steam makes the equilibrium vapor pressure of the crude benzene on the surface of the washing oil greater than the partial pressure of the crude benzene in the carrier, and the vapor-liquid two-phase contacts in countercurrent to conduct mass transfer and heat transfer, so that the crude benzene is gradually released from the rich oil, and in the...

AI Technical Summary

Problems solved by technology

[0004] Although cast iron has many of the above advantages, it also has the following disadvantages: its tensile strength, plasticity, toughness and elastic modulus are relatively low, especially poor welding performance

If welding or replacement of the tower ring is used for treatment, all crude benzene units in the chemical recovery process must be shut down, and the maintenance cycle will usually be longer, which will have a greater impact on the continuous production of the chemical recovery process and also affect the chemical recovery process Technical and economic indicators

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