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Mercury-containing sludge heat treatment method

A heat treatment method and sludge technology, applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/concentrated sludge treatment, etc., can solve the problems of secondary pollution, health effects, mercury toxicity, etc. The effect of environmental pollution problem control, thermal energy recycling, simple and reasonable process

Active Publication Date: 2016-10-12
SOUTHWEST PETROLEUM UNIV +1
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Problems solved by technology

If mercury-containing sludge in oil and gas fields is not treated in time, it will cause serious secondary pollution. Mercury is a toxic heavy metal, which is defined as Class I (extremely harmful) poison by GBZ230-2010 "Classification of Occupational Exposure to Toxic Substances". It and its various compounds are highly toxic, and will have a series of serious health effects on the human brain and nervous system, and cause serious harm to human reproductive ability and organs.
Traditional sludge treatment methods such as landfill, sludge composting or sludge incineration have been unable to meet the treatment of mercury-containing sludge, and the newly developed biological treatment process is immature

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Embodiment Construction

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0022] as attached figure 1 Shown is a kind of embodiment of the present invention, the mercury-containing sludge treatment scale in the present embodiment is 1m 3 / d (containing oil, water and mercury), total mercury content in sludge: >200mg / kg; sludge oil content: ≤10% (material before entering the dehydrator), sludge moisture content: ≥90%.

[0023] The mercury concentration in the waste residue leaching solution produced after the pyrolysis of mercury-contain...

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Abstract

The invention discloses a mercury-containing sludge heat treatment method which is characterized by treating mercury-containing sludge with moisture content of over 90% sequentially by a sludge conditioning device with a heating function, a dehydrator, a screw conveyer, a pyrolysis unit, a dust remover, a spraying condensation device, a coalescer and a tail gas treatment device, wherein treatment of the pyrolysis unit sequentially comprises drying treatment, pyrolysis treatment and combustion treatment. The mercury-containing sludge is firstly pre-treated; the pre-treated sludge is fed into the pyrolysis unit; after the sludge is subjected to pyrolysis combustion, formed pyrolysis gas circularly enters a drying section to be utilized; mercury and compounds thereof in the sludge are all changed into mercury vapor; then the mercury vapor is charged into a dust removal unit and a condensation unit to recover liquid mercury. According to the mercury-containing sludge heat treatment method disclosed by the invention, a pyrolysis technology is adopted to carry out harmless treatment on the sludge; heat energy is recycled; sludge treatment energy consumption is reduced; mercury pollution is prevented; moreover, byproducts with a certain value are produced; the mercury-containing sludge heat treatment method not only has economic benefits, but also has social benefits.

Description

technical field [0001] The invention belongs to the field of energy and environmental protection of oil and gas fields, and in particular relates to a heat treatment method for mercury-containing sludge. Background technique [0002] In recent years, with the development of my country's natural gas industry, domestic mercury-containing gas fields produce a large amount of mercury-containing sludge every year, and the treatment of mercury-containing oily sludge is an indispensable and important process link in the oil and gas field treatment system. If mercury-containing sludge in oil and gas fields is not treated in time, it will cause serious secondary pollution. Mercury is a toxic heavy metal, which is defined as Class I (extremely harmful) poison by GBZ230-2010 "Classification of Occupational Exposure to Toxic Substances". It and its various compounds are highly toxic, and will have a series of serious health effects on the human brain and nervous system, and cause seriou...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/10C02F11/12C02F11/14B01D53/02B01D50/00
CPCB01D53/002B01D53/02C02F11/00C02F11/10C02F11/121C02F11/14B01D2257/602B01D50/60Y02W10/40
Inventor 蒋洪裴蕾
Owner SOUTHWEST PETROLEUM UNIV
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