Pre-treatment system for acid water of oil refinery

Abstract

The invention discloses a pre-treatment system for acid water of an oil refinery, which is mainly composed of three acid water storage tanks connected in sequence, two water seal tanks, two sets of impurity and oil removing devices and one set of acid water gas ejecting, degassing and deodorization device 6. The three acid water storage tanks comprise an impurity and oil removing tank 1, a stabilizing tank 2 and a stripping tower feeding tank 3. The two water seal tanks comprise a positive pressure water seal tank 4 and a safe water seal tank 5. The two sets of impurity and oil removing devices comprise a tank-in-tank oil and impurity removing device 7 and a rotational flow oil removing device 8. The three-tank two-water-seal oil removing deodorization combination technology flow is one set of complete, refining and advanced acid water pre-treatment technology. The pre-treatment system can enable raw material water pre-treating processes and results to meet technology production requirements and safety and environment-friendly requirements. Therefore, safety and environment-friendly problems bothering people for many years in the aspects of pretreatment for the acid water of the oil refinery are solved thoroughly, and a gap in the aspect of acid water pretreatment technology standardization in our country is filled.

Description

technical field [0001] The invention relates to an acidic water treatment system, in particular to an acidic water pretreatment system in an oil refinery. Background technique [0002] Refinery will produce a large amount of acidic water in the normal production process. The main sources of this acidic water are atmospheric and vacuum distillation, catalytic cracking, reforming, coking, hydrocracking, hydrofining and sulfur recovery devices. Under normal circumstances, these acidic water will be concentrated in the acidic water stripping unit for unified treatment. Because acidic water has many sources and complex components: it not only contains high concentrations of sulfide and ammonia nitrogen, but also contains a large amount of suspended solids, dirty oil, oil gas and other toxic and harmful gases, so it cannot directly enter the acidic water stripping tower for treatment. Therefore, there is an acid water pretreatment system in the acid water stripping unit. [0003...

AI Technical Summary

Problems solved by technology

[0004] ① The deoiling effect of acidic water is not ideal, and the oil content of acidic water entering the stripping tower is too high, resulting in unsatisfactory vapor-liquid balance in the stripping tower. In severe cases, tower flushing occurs, and the quality of purified water, acid gas and liquid ammonia deteriorate , or even unqualified;

[0005] ②The deodorization effect of acidic water tank top gas is not ideal, and the environment around the device is polluted;

[0006] ③ The safety of acid water storage tanks is not fully guaranteed

Some manufacturers experienced water tank negative pressure collapse; some manufacturers experienced accidents such as bursting of acidic water storage tanks

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