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Method for reducing and reusing sulfur-bearing waste water of coking unit

A technology for coking equipment and sewage, which is applied in the field of reduction and reuse of sulfur-containing sewage in coking equipment. It can solve problems such as water analysis and optimization of equipment, large production of sulfur-containing sewage, and great potential for water saving and emission reduction, so as to reduce sulfur The amount of sewage, the realization of economic and environmental benefits, and the effect of increasing the amount

Active Publication Date: 2016-07-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, many enterprises have carried out work on reducing the amount of sulfur-containing sewage produced by coking units and increasing the reuse ratio of sulfur-containing sewage and stripped purified water. Systematically, comprehensively and integrally analyze and optimize the water and drainage links of the device, so the current generation of sulfur-containing sewage in the device is still relatively large, the amount of reuse is not enough, and the potential for water saving and emission reduction is great

Method used

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  • Method for reducing and reusing sulfur-bearing waste water of coking unit

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Experimental program
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Effect test

Embodiment 1

[0048] The coking unit of a refinery has a design processing capacity of 2.4 million t / a. After water and drainage analysis, the following optimization measures can be taken:

[0049] 1) By adjusting the steam injection in the heating furnace tube, the sealing gas of the ball valve and the small blowing steam, the total amount of sulfur-containing sewage at the top of the fractionation tower is reduced from 10t / h to 7t / h;

[0050] 2) Absorbing and stabilizing the sulfur-containing sewage from the liquid separation tank of the stabilizing tower and reusing it for water injection at the top of the fractionating tower;

[0051] 3) Purified water replaces the blown steam cold coke. The device needs to blow steam twice a day, each time for 2.5 hours, and the steam blowing volume is about 20t / h, and about 45t of 1.0MPa steam is needed to process one tower of coke; if purified water is used instead, only about 6t is needed to treat one tower of coke, which can save The 1.0MPa steam ...

Embodiment 2

[0056] The 1.4 million t / a coking unit of a refinery takes the following process adjustment measures:

[0057] 1) The steam injection rate of the heating furnace is reduced from the original 2.4t / h to 1.8t / h;

[0058] 2) The steam consumption of small blowing steam is reduced from 6t / h to 2.5t / h, and the steam consumption of large blowing steam is reduced from 20t / h to 11t / h, saving 50t of steam per day;

[0059] 3) Cancellation of water injection at the top of the fractionation tower;

[0060] 4) Use purified water after stripping instead of demineralized water to inject water into the outlet of the coking gas-enriched compressor (before air cooling), and the water injection rate is 1.5t / h;

[0061] Through the above optimization and adjustment, the device can save 23,000 tons of steam annually, reduce the generation of sulfur-containing sewage by 23,000 tons, and increase the reuse of purified water by 13,000 tons.

Embodiment 3

[0063] The 1.6 million t / a coking unit of a refinery, through the analysis of the water and drainage of the unit, took the following optimization measures:

[0064] 1) The steam injection rate of the heating furnace tube is reduced from 3t / h to 2t / h;

[0065] 2) The amount of stripping steam in the fractionator wax oil stripper is reduced from 1t / h to 0.5t / h;

[0066] 3) The sulfur-containing sewage in the liquid separator tank of the absorption stabilization system is directly cascaded and used for water injection at the top of the fractionation tower;

[0067] 4) Use purified water after stripping instead of desalinated water to inject water into the outlet of the coking gas-enriched compressor (before air cooling), saving softened water and reducing the production of sulfur-containing sewage by 2t / h;

[0068] 5) The small steam blowing is reduced from 6t / h to 4t / h, and the large steam blowing is reduced from 20t / h to 12t / h;

[0069] 6) The original steam consumption of th...

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Abstract

The invention provides a method for reducing and reusing sulfur-bearing waste water of a coking unit.The water use link and the drainage link of the coking unit are subjected to systematic optimization, consumption of steam and water resources is reduced, the sulfur-bearing waste water is used in a cascading mode, the amount of the generated sulfur-bearing waste water is reduced from the source, the amount of the sulfur-bearing waste water entering a subsequent acidic water steam stripping device is reduced, the water is purified after multi-path reusing and steam stripping, and the mount of the waste water entering a tail end treatment device of a sewage farm is reduced; the pressure of the acidic water steam stripping device and the tail end sewage farm is reduced, natural clean production and source water saving and emission reducing are achieved, and double win of economic benefits and environmental benefits can be achieved.

Description

technical field [0001] The invention relates to the technical field of petrochemical industry, in particular to a method for reducing and reusing sulfur-containing sewage of a coking unit. Background technique [0002] When refineries process sulfur-containing crude oil, devices such as atmospheric and vacuum, catalytic cracking, delayed coking, and hydrofining must discharge a large amount of sulfur-containing sewage (acidic water). Sulfur-containing sewage contains not only a large amount of hydrogen sulfide, ammonia nitrogen, but also Contains phenol, cyanide, and petroleum-based pollutants, has a strong odor, and is corrosive to equipment. The generation and discharge of sulfur-containing sewage not only affects the acidic water stripping device in the pretreatment process, but also restricts the operation of the terminal sewage treatment plant. With the increasing degree of high sulfidation and high acidification of processed crude oil, the increasingly stringent envir...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F103/36
CPCC02F1/04C02F1/20C02F9/00C02F2103/365C02F2301/08
Inventor 姜学艳陈玉伟李焕丁禄彬汪皕喆
Owner CHINA PETROLEUM & CHEM CORP
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