A kind of mercury-containing sludge heat treatment method

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...

AI Technical Summary

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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