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
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[0047] Example 1:
[0048] The coking unit of a refinery has a designed 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 of the heating furnace tube, the ball valve sealing gas 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) The sulphur-containing sewage in the separation tank of the absorption stabilization tower is reused for water injection at the top of the fractionation tower;
[0051] 3) Purified water replaces blown coke. The device needs to blow steam twice a day, 2.5 hours each time, the steam blowing volume is about 20t / h, each tower of coke processing requires about 1.0MPa steam 45t; implementation of purified water replacement, processing one tower of coke only needs about 6t, which can save 1.0MPa steam 28,000t / a, reused steam stripping purified w...
Example Embodiment
[0055] Example 2:
[0056] A 1.4 million t / a coking plant in a refinery adopted 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 consumption of small blowing steam is reduced from 6t / h to 2.5t / h, and the consumption of large blowing steam is reduced from 20t / h to 11t / h, saving 50t of steam per day;
[0059] 3) Cancel water injection at the top of the fractionation tower;
[0060] 4) Use purified water after stripping to replace demineralized water as water injection at the outlet of the coking rich gas compressor (before air cooling), with a water injection rate of 1.5t / h;
[0061] Through the above optimization and adjustment, the device can save 23,000 tons of steam annually, reduce the production of sulfur-containing sewage by 23,000 tons, and increase the amount of purified water by 13,000 tons.
Example Embodiment
[0062] Example 3:
[0063] A 1.6 million t / a coking plant in a refinery has adopted the following optimization measures by analyzing the water and drainage of the plant:
[0064] 1) The steam injection rate of the heating furnace tube is reduced from 3t / h to 2t / h;
[0065] 2) The steam consumption of the fractionation tower wax oil stripping tower is reduced from 1t / h to 0.5t / h;
[0066] 3) The sulphur-containing sewage in the stabilizing tower separation tank of the absorption stabilization system is directly used in cascade for water injection at the top of the fractionation tower;
[0067] 4) Use purified water after stripping to replace demineralized water as water injection at the outlet of the coking-rich gas compressor (before air cooling), which saves softened water and reduces the production of sulfur-containing wastewater by 2t / h;
[0068] 5) The small blow steam is reduced from 6t / h to 4t / h, and the large blow steam is reduced from 20t / h to 12t / h;
[0069] 6) The original steam...
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