Sewage treatment method of a delayed coking device

A sewage treatment method and delayed coking technology, applied in water/sewage treatment, flotation water/sewage treatment, water/sewage multi-stage treatment, etc., can solve problems such as coking sewage treatment difficulties, and achieve strong pertinence and easy settlement Layered, low-volume effects

Pending Publication Date: 2020-08-14
SHANDONG JILIAN PETROCHEM ENG
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0008] The technical task of the present invention is to provide a delayed coking unit sewage treatment method to solve the problems of coking sewage containing oil, coke powder and hydrogen sulfide in delayed coking units.

Method used

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  • Sewage treatment method of a delayed coking device
  • Sewage treatment method of a delayed coking device
  • Sewage treatment method of a delayed coking device

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Embodiment

[0065] as attached figure 1 As shown, the delayed coking plant sewage treatment method of the present invention, the method is specifically as follows:

[0066] (1) Pretreatment: Inject the demulsifier with active conversion agent, high-efficiency dispersant and flocculant into the pretreatment module S1, wherein the active conversion agent adopts polyoxyethylene polyoxypropylene polyether with multi-branch structure, The addition amount is 50-100mg / L; the high-efficiency dispersant uses polyacrylamide cationic polymer copolymer, and the addition amount is 0-5mg / L; the flocculant uses polyaluminosilicate, and the addition amount is 0-50mg / L; The temperature in the treatment module is 40-90°C. After the sewage is mixed with a demulsifier, it is buffered, settled and stratified in the pretreatment module S1, and then discharged to the downstream for treatment; as attached figure 2As shown, the pretreatment module S1 includes a raw water tank S1-1 and a waste oil tank S1-2, the...

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Abstract

The invention discloses a sewage treatment method of a delayed coking device, belongs to the field of petrochemical engineering, aims to solve the technical problem that coking sewage is difficult totreat such as oil, coke powder and hydrogen sulfide in a delayed coking device at present. The adopted technical scheme is that the method comprises the following steps: pretreatment: adding a demulsifier added with an active conversion agent, a high-efficiency dispersing agent and a flocculating agent into a pretreatment module; oil removing: discharging gas, oil, water and settled sewage from agas-liquid separation area, a floating oil layer area, a sewage separation area and a settling area in a layered mode through a rotational flow air floatation oil removal module, and discharging sewage discharged from the sewage separation area to the downstream to be treated; filtering: carrying out two-stage backwashing filtering by adopting a filtering module, and sending to downstream treatment; and steam stripping: performing steam stripping through a steam stripping tower of a steam stripping module, sending acid gas at the top of the steam stripping tower after steam stripping to the inlet of a coking compressor, and using purified water at the bottom of the steam stripping tower directly as water injected at the top of the coking fractionating tower and in front of a compressed rich gas air cooler or as cold coke water replenishing water.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to a sewage treatment method of a delayed coking unit. Background technique [0002] During the production process of delayed coking unit (hereinafter referred to as coking unit), vent tower (contact cooling tower) and fractionation tower will produce oily sewage; these two streams of sewage are oily, emulsified, carry coke powder and contain hydrogen sulfide and ammonia. At present, the traditional coking oily sewage treatment method in refineries is to send it to the unified sewage stripping unit of the whole plant, mix it with the sulfur-containing sewage (acidic water) produced by each unit of the plant, and then carry out "sedimentation oil separation + sewage stripping", Removal of hydrogen sulfide and ammonia; because coking oily sewage has high oil content and carries coke powder, which affects the gas-liquid phase balance in the sewage stripping tower and affects the q...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F101/32C02F103/36
CPCC02F9/00C02F2209/02C02F1/5281C02F2001/007C02F1/00C02F1/24C02F1/40C02F1/001C02F1/10C02F1/56C02F2101/32C02F2103/365
Inventor 王志众魏川林刘建华
Owner SHANDONG JILIAN PETROCHEM ENG
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