Method for prolonging continuous operation cycle of sludge wet oxidation

Abstract

The invention provides a method for prolonging the continuous operation period of sludge wet oxidation, and relates to the technical field of sludge treatment. According to the method, high-temperature oxidation sludge effluent at the top of a sludge wet oxidation reactor is subjected to high-pressure flash evaporation degassing, and part of the degassed high-temperature sludge material flow is circulated back to an inlet pipeline of a reactor and mixed with raw materials so as to heat the raw materials. According to the invention, the scaling and blocking phenomena of a heat exchanger, a cooler and a regulating valve caused by the adoption of a high-temperature oxidized sludge and raw material heat exchanger, a high-temperature sludge cooler, a high-temperature sand-containing sludge cooler and a high-temperature sludge pressure control valve in a conventional wet oxidation process are avoided, and the continuous operation period of a sludge wet oxidation device is prolonged; the reaction temperature is flexibly adjusted through the flow of the oxidized sludge circulating material flow to avoid over-temperature of the reactor; and the material flow of an oxidation reaction pressure regulating valve is controlled to be changed into a pure gas phase from a gas phase, a liquid phase and a solid phase, so that the reaction pressure control is safer, more reliable and more flexible.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to sludge wet oxidation process technology. Background technique [0002] A large amount of hazardous waste is generated during the extraction and refining of oil and natural gas. Among them, activated sludge, oily sludge and waste lye are waste solids and waste liquids produced in industrial processes. The sludge was first landfilled after mechanical dehydration, but it seriously polluted the surrounding environment and groundwater sources. Later, the method of incineration after mechanical dehydration was adopted, which consumes a lot of energy. Improper incineration will produce toxic gases such as dioxins, causing serious air pollution. Now there are techniques that adopt steam heating, boiling in hot water and incineration in rotary kiln, and the energy consumption and cost are all very high. Oily sludge usually comes from the oily sewage series oil separation, air ...

AI Technical Summary

Problems solved by technology

The incineration method uses the incinerator to directly incinerate the sludge with the combustion heat of fuel gas. The incineration method consumes a lot of energy, and the oil resources are not recycled, which will cause secondary pollution.

Images