Processing method for preparing liquid fuel by performing sludge liquefaction

Abstract

The invention discloses a processing method for preparing a liquid fuel by performing sludge liquefaction. The processing method comprises the following steps: 1, mixing a sludge raw material, a recycling solvent and a catalyst in proportion at a certain temperature so as to obtain a slurry; 2, after preheating the slurry, and mixing the slurry and reaction gas to generate a liquefaction reaction; 3, performing gas-liquid separation on a liquefied product, and separating a gas phase by using an oil-water separator to obtain light oil, gas and a water phase, performing desulfurization and decarbonization on the gas phase to obtain noncondensable gas, performing settling separation on a liquid phase to obtain an oil phase and residues, and distilling the oil phase to obtain medium oil and heavy oil; 4, pressurizing partial noncondensable gas to return the partial noncondensable gas into a reactor so as to participate in a liquefaction reaction; 5, returning partial water phase to the slurry preparation step. According to the processing method, the sludge raw material without drying treatment is directly subjected to a hydrothermal liquefaction reaction under the atmosphere of CO or synthesis gas, not only can a lot of water in the raw material be consumed, but also the quality of the liquefaction product is improved, so that high-quality oil and other products are obtained. By adopting the processing method, the organic substances in the sludge are efficiently transferred, and the processing method has good environment and social benefit.

Description

technical field [0001] The invention relates to a technique for making sludge into liquid fuel, and belongs to the field of sludge resource processing. Background technique [0002] Sludge is the product of sewage treatment. It is an extremely complex heterogeneous body composed of organic debris, bacterial cells, inorganic particles and colloidal sludge. It has high water content, high heavy metal content and high harmful microorganism content. specialty. At present, my country's sludge treatment technology has been lagging behind the corresponding sewage treatment technology. According to the "Twelfth Five-Year Plan" National Urban Sewage Treatment and Recycling Facilities Construction Plan, as of the end of the "Eleventh Five-Year Plan" in 2010, China's urban sewage treatment The harmless disposal rate of the sludge produced by the plant is less than 25%. 80% of the sludge produced by my country's sewage treatment plants has not been properly treated. widespread attention...

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Problems solved by technology

[0003] Traditional sludge treatment methods mainly include: landfill, fertilization, and incineration, etc., but they all have obvious disadvantages: landfill and fertilizer utilization cause serious pollution to water bodies, and heavy metals in sludge are enriched by plants and passed through the food chain. The transmission with the biological chain has a toxic effect on humans; due to the low calorific value of the sludge itself, the incineration treatment will consume a large amount of auxiliary fuel, and at the same time, the high moisture content of the sludge itself leads to incomplete combustion, and more solids remain after combustion Residue, the combustion tail gas contains a large amount of toxic gases such as nitrogen oxides and sulfur oxides, and direct discharge will have adverse effects on the environment

The essence of this technology is pyrolysis extraction of sludge, the operating conditions are harsh, and the heteroatom content in the obtained oil is very high. At the same time, it does not indicate how to use a large amount of water after the reaction

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