Device for increasing reuse rate of purified water of refinery plant, and using method of device

Abstract

The invention discloses a device for increasing the reuse rate of purified water of a refinery plant, and a using method of the device, belonging to the technical field of purified water recovery of refinery plants. Filters are introduced into a purified water pipeline in the existing hydrogenation water injection water source; two stages of filtration facilities are added for improving the water quality of the purified water. One stage of filtration facility comprises two filters which can be switched; one of the two filters is started and the other filter is used for standby application during normal production; the filters are switched for washing at the fixed period; the two filters are respectively and internally provided with a filter screen wire mesh as a filter element, and the filter precision is greater than 25mu m; the differential pressure indication on an inlet and outlet pipeline of the first stage filter is used for displaying the differential pressure of the first stage filter; a built-in framework of the second stage filter is formed by a 304 stainless steel punched filter screen and an internal filter bag, and the filter precision is greater than 10mu m. The device provided by the invention increases the proportion of the purified water in hydrogenation water injection and improves the properties of the purified water in the hydrogenation water injection.

Description

technical field [0001] The invention relates to the technical field of recovery of purified water in an oil refinery, in particular to a device for improving the reuse rate of purified water in a refinery and a method for using the device. Background technique [0002] At present, most refinery sewage is directly discharged or reused in a small amount after the secondary treatment process, and the pollutants in it will still cause pollution and consume a large amount of water. With the increasing shortage of water resources and the continuous increase in demand for petroleum products, the amount of wastewater treatment in refineries and the total amount of industrial water use have increased. Therefore, it is very necessary to study how to reuse the purified water treated by the refinery sewage gas stripping unit. The water source for hydrogenation unit water injection is a very effective way to recover and use purified water, but due to the poor quality of purified water ,...

AI Technical Summary

Problems solved by technology

Therefore, it is very necessary to study how to reuse the purified water treated by the refinery sewage gas stripping unit. The water source for hydrogenation unit water injection is a very effective way to recover and use purified water, but due to the poor quality of purified water , and the hydrogenation high-pressure water injection pump has high requirements on the medium due to its high speed, high compression ratio, and small flow rate. The high-pressure water injection pump may fail if it contains very small solid particles, resulting in frequent failures of the high-pressure water injection pump, which cannot meet the requirements. The safe operation of the high-pressure water injection pump not only brings high inspection and maintenance costs, but also brings greater risks to the stable operation of the device

Therefore, in actual operation, the injection water of the hydrogenation unit, especially the water for high-pressure hydrogenation, is often not fully purified, but part of the desalted water is mixed with a certain proportion of purification, which greatly reduces the reuse rate of purified water in the refinery and increases industrial water consumption

[0003] In recent years, domestic and foreign refinery wastewater reuse technologies have been diversified. For example, it has been reported in the prior art that membrane filtration and bioreactors are combined to deeply treat refinery wastewater. Long, the reuse of sewage is relatively high, and it can be completely used as water for hydrogenation water injection, but the equipment investment is large, and the operating and maintenance costs are also relatively high

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