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A kind of mercury-containing sludge heat treatment method

A sludge and sludge conditioning technology, applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/thickened sludge treatment, etc., can solve problems such as secondary pollution, health impact, mercury toxicity, etc. , to achieve the effect of environmental pollution control, simple and reasonable process, and heat recycling

Active Publication Date: 2022-04-19
SOUTHWEST PETROLEUM UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • A kind of mercury-containing sludge heat treatment method
  • A kind of mercury-containing sludge heat treatment method
  • A kind of mercury-containing sludge heat treatment method

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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 method for heat treatment of mercury-containing sludge, which is characterized in that the mercury-containing sludge with a water content greater than 90% is sequentially passed through a sludge conditioner with heating function, a dehydrator, a screw conveyor, a pyrolysis unit, and a dust removal unit. The treatment is carried out by the device, the spray condensing device, the coalescer and the tail gas treatment device, wherein the treatment of the pyrolysis unit includes the drying treatment, pyrolysis treatment and combustion treatment of the sludge in sequence. The mercury-containing sludge is firstly pretreated, and the pretreated sludge is sent to the pyrolysis unit, and the pyrolysis gas formed after the sludge is pyrolyzed and burned is circulated into the drying section for utilization, and the mercury and its compounds in the sludge are transformed It is mercury vapor, which is then passed to the dust removal and condensation unit to recover liquid mercury. The invention patent uses pyrolysis technology to treat sludge harmlessly, recycles heat energy, reduces sludge treatment energy consumption, prevents mercury pollution, and produces by-products with certain value, which has both economic benefits and social value.

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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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/10C02F11/12C02F11/14B01D53/02B01D50/00C02F101/20
CPCB01D53/002B01D53/02C02F11/00C02F11/10C02F11/121C02F11/14B01D2257/602B01D50/60Y02W10/40
Inventor 蒋洪裴蕾
Owner SOUTHWEST PETROLEUM UNIV
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