Device and method for resource utilization and harmless treatment of oily sludge

Abstract

The invention discloses a device and method for resource utilization and harmless treatment of oily sludge. The method comprises the following steps: carrying out scattering and crushing pretreatment on high-oil-content sludge with an oil content of more than or equal to 5%, then carrying out thermal cracking to recover oil, and burning generated non-condensable gas in a cement kiln, subjecting generated thermal cracking furnace slag with an organic matter content of less than 0.5% to heat exchange, and then putting the thermal cracking furnace slag into a raw material system the cement kiln; carrying out scattering and crushing pretreatment on low-oil-content sludge with an oil content of less than 5%, performing roasting treatment on the low-oil-content sludge and thermal cracking furnace slag with an organic matter content of more than or equal to 0.5%, carrying out heat exchange on the generated roasting furnace slag, putting the generated roasting furnace slag into a cement raw material system, and treating the generated roasting furnace waste gas in the cement kiln. According to the invention, the traditional resource utilization and cement kiln co-processing mode of the oily sludge is innovatively changed through a system integration process, oil recovery is realized, large-scale co-processing of the oily sludge in the cement kiln is realized through raw material addition, and the method has the characteristics of wide application range, full resource utilization, thorough and harmless treatment and the like.

Description

technical field [0001] The invention relates to the technical field of solid waste treatment, in particular to a device and method for resource utilization and harmless treatment of oily sludge. Background technique [0002] Oily sludge belongs to HW08 mineral oil-containing waste in the National Hazardous Waste List. For oily sludge, there are currently two mainstream technologies, one is to use thermal desorption treatment technology for oil recovery and other resource utilization and harmless treatment; the other is to use cement kiln co-processing solid waste technology to treat oily sludge Carry out harmless treatment and resource utilization; these two technologies have a certain scope of use, but there are many key issues that need to be studied and resolved. [0003] The existing thermal desorption treatment technology has the following disadvantages: (1) the cost of energy consumption is relatively high; (2) the blending ratio of the residue used for sintered brick...

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Problems solved by technology

[0003] The existing thermal desorption treatment technology has the following disadvantages: (1) the cost of energy consumption is relatively high; (2) the blending ratio of the residue used for sintered bricks is only about 10%, which is used for laying roads It is easy to generate dust and there are hidden dangers such as environmental secondary pollution; resource utilization in wastewater COD can reach 2×10 4 mg / L, accompanied by stench, the amount produced is between 3-8% of the material quality, and it can be treated separately to meet the reuse or discharge standards, with high economic costs and low utilization rate of sewage treatment equipment; (3) The tail gas produced is difficult to discharge up to the standard (4) It has good technical economy for high oil content sludge (oil content > 5%), but for low oil content sludge (oil content < 5%), its technical economy is poor

[0004] The existing cement kiln co-processing solid waste technology is based on standards and technical specifications such as "Environmental Protection Technical Specifications for Co-processing Solid Waste in Cement Kilns" (HJ662-2013) and "Technical Specifications for Co-processing Solid Waste in Cement Kilns" (GB 30760-2014) , whether it is high-oily sludge or low-oily sludge, because it contains high-temperature volatile organic matter (mineral oil, etc.), after pretreatment such as crushing, compatibility, and mixing, it can only be passed through the cement kiln decomposition furnace feeding point, etc. The high-temperature dosing point enters the cement kiln system for harmless treatment and resource utilization. This high-temperature dosing method lacks processes such as drying and grinding of raw meal raw materials, raw meal drying preheating, and pre-burning, which inevitably brings The following main problems: (1) It has an impact on the main process of cement production; according to industry statistics, a cement kiln system with a daily output of 5000 tons adopts the method of directly adding oily sludge, and the output decreases by about 3-5%, and the power consumption increases by about 5%; (2) The disposal capacity is generally small; for a cement kiln system with a daily output of 5000T, the average hourly disposal capacity is basically hovering at 2-3T / H, making it difficult to dispose of oily sludge on a large scale; (3) The value of resource utilization is generally low, especially oily sludge The precious mineral oil resources contained in the sludge are burned as an alternative fuel (raw coal), resulting in a large waste of resources

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