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Equipment system for comprehensive treatment of refinery acid alkali containing waste liquid

A comprehensive treatment and refinery technology, applied in the direction of liquid separation, biological water/sewage treatment, degassed water/sewage treatment, etc., can solve the problems of high infrastructure costs and operating costs, and can not be recovered from them, achieving remarkable governance effects, The effect of small separation equipment and less power equipment

Active Publication Date: 2011-02-09
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using this method to treat waste alkali slag needs to be carried out under high temperature and high pressure, which requires high infrastructure and operating costs. The cost of treating waste alkali slag is about 100-150 yuan per ton, and useful components cannot be recovered from it.

Method used

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  • Equipment system for comprehensive treatment of refinery acid alkali containing waste liquid
  • Equipment system for comprehensive treatment of refinery acid alkali containing waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The equipment system and process are shown in the attached drawings. The system equipment consists of two online mixers, acidification separation tank or separation tower or centrifugal separator, acid water tank, alkaline water tank and stripping tower. The acid water tank is connected to the positive bed of the power station through the pump. The excess acid-containing sewage produced during backwashing is connected, and the acid water tank is connected to two online mixers respectively. The gasoline sweetening waste liquid residue is connected to the online mixer 1 through the pump, and the online mixer 1 is connected to the acidification separation tank. , the acidification separation tank is connected with the alkaline water tank, the alkaline water tank is respectively connected with the liquid hydrocarbon alkali residue and the online mixer 2, the online mixer 2 is connected with the stripper, and the stripper is connected with the sulfur plant and the sewage treat...

Embodiment 2

[0019] The equipment system and process are the same as in Example 1, and the operating conditions are: the acidification is carried out with excessive acid-containing sewage produced during backwashing of the positive bed, the acid content is 25.0% by weight of the acid-containing sewage, and the pH value of the acidification is 9.0.

[0020] Take 600ml of spent alkali residue, the pH value after acidification is 4.6, the residence time is 60min, and the clarification time is 80min. The COD removal rate of treated wastewater is 89.2%, and the oil removal rate is 92.5%.

Embodiment 3

[0022] The equipment system and process are the same as in Example 1, and the operating conditions are: the acidification is carried out with excessive acid-containing sewage produced during the backwashing of the positive bed, the acid content is 20% by weight of the acid-containing sewage, and the pH value of the acidification is 8.

[0023] Take 600ml of waste caustic residue, after acidification, the pH value is 6.8, the residence time is 90min, and the clarification time is 120min. After treatment, the COD removal rate of wastewater is 83.6%, and the oil removal rate is 90.5%.

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Abstract

The present invention relates to system and technological process for treating waste water from oil refinery comprehensively. The present invention includes treating acid-containing sewage from anode backflushing in a acid water tank, mixing gasoline sweetening waste and acid-containing sewage from the acid water tank in the first mixer and treating the mixture in a acidifying separation tank to separate out organic matter to be recovered and acid water, mixing the acid water and liquid hydrocarbon base slag in a base water tank, further mixing with acid water from the acid water tank in the second mixer for acidifying, steam stripping the acidified water in a stripper to separate out gas containing hydrogen sulfide and ammonia to be recovered in a sulfur unit, and biochemically treating the sewage in a sewage farm. The present invention can eliminate 85 % of oil and 85 % of sulfide and recover hydrogen sulfide and ammonia before the biochemical treatment of the waste water.

Description

technical field [0001] The invention relates to a comprehensive treatment equipment system and process for waste liquid and waste residue generated during gasoline sweetening, liquid hydrocarbon alkali washing and anode bed backwashing in an oil refinery, especially related to refinery gas separation and re-catalyzed alkali washing. Treatment equipment system for the generated alkali-containing wastewater and waste alkali residue. Background technique [0002] There are three streams of waste water produced during the production process of the refinery, one of which is the acid-containing waste water (hereinafter referred to as acid-containing waste water) produced during backwashing of the anode bed in the power workshop of the refinery; the other stream of waste water is the refinery gas, heavy Waste alkali slag (hereinafter referred to as waste alkali slag) produced during alkali washing of gasoline and liquid hydrocarbons in the catalyst workshop; there is also a stream ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/66C02F1/20C02F1/40C02F3/00
Inventor 李向富马克存杜龙弟刘德军张春燕梁立伟赵兴龙赵振胜王希权郭桂悦郝丽左艳梅胡艳梅关蕾
Owner PETROCHINA CO LTD
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