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Method for treatment of oil sludge by microwave catalytic pyrolysis

A technology of microwave catalysis and pyrolysis of oil, which is applied in the direction of pyrolysis treatment of sludge and vaporization of by-products, etc., can solve the problems of water body and vegetation pollution, land poisoning, hindering the growth of plant roots, etc., and achieve the effect of good economical industrial application

Active Publication Date: 2013-04-24
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

These oil sludges generally contain benzene series, phenols, citrons and other substances, and are accompanied by stench and toxicity. If they are directly in contact with the natural environment, they will poison, acidify or alkalinize the land, resulting in changes in soil and soil structure, hindering the growth of plants. The root system grows and will cause great pollution to water bodies and vegetation, and it also means a waste of oil resources

Method used

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  • Method for treatment of oil sludge by microwave catalytic pyrolysis

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Embodiment 1

[0023] use figure 1 The process flow shown. The specific embodiment of the present invention is described by taking oil sludge at the bottom of a refinery oil tank as an example. Oil sludge contains 81% oil (mass), 12% water, and the rest is solid matter.

[0024] After the sludge is dehydrated and pretreated to remove mechanical impurities, it is heated to 350°C in a heating furnace and mixed with SeO 2 After the catalyst is mixed, it enters the pyrolysis reactor. The reaction temperature is 480°C, the mass ratio of catalyst to oil sludge is 1:50, and the reaction time is 30min / m 3 sludge. The reactor is externally connected with a microwave radiation device. The microwave radiation frequency is 2450MHz, and the power is continuously adjustable to 750W. The radiation time is the same as the reaction time. The pyrolysis gas enters the three-phase separator through the heating pipeline. In order to avoid the solidification of the pyrolysis gas, the temperature of the hea...

Embodiment 2

[0027] The specific embodiment of the present invention is described by taking oil sludge at the bottom of a refinery oil tank as an example. Oil sludge contains 65% oil, 24% water, and the rest is solid matter. The catalyst is SeO prepared by impregnation method 2 / Al 2 o 3 (SeO 2 content is 10%) catalyst, the reaction temperature is 500°C, the mass ratio of catalyst to oil sludge is 1:40, and the reaction time is 15min / m 3 sludge. The microwave radiation frequency is 2450MHz, and the power is continuously adjustable to 600W. The radiation time is the same as the reaction time.

[0028] After the oil sludge is pyrolyzed by microwave catalyst, the liquid phase yield is 87%, the 350°C fraction accounts for 41.5%, and the gas yield is 9.6% %, coke yield 3.4%.

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Abstract

The invention discloses a method for treatment of oil sludge by microwave catalytic pyrolysis. The method consists of: leaving preheated oil sludge and a catalyst to enter a pyrolysis reactor equipped with external microwave radiation together; conducting thermal conversion on the oil sludge and the catalyst in the reactor, making pyrolysis gas enter a three-phase separator, recycling the upper gas phase component, discharging the bottom oily sewage into a sewage treatment system, and delivering the recovered oil into a storage tank for storage. According to the invention, by adding a proper amount of the catalyst with a "hydrogen transfer" function into the oil sludge subjected to microwave pyrolysis, hydrogen in the light oil component of the oil sludge can be transferred out to stabilize free radicals generated by the reaction, so that the oil sludge can undergo a complete and effective pyrolysis treatment. Thus, the method provided in the invention can achieve a maximal liquid phase yield and a minimal coke yield.

Description

technical field [0001] The invention relates to a method for treating oily sludge, in particular to a method for treating oily sludge by microwave catalytic pyrolysis. Background technique [0002] Oily sludge mainly refers to the oily sludge formed by crude oil and soil due to various reasons, and the oily sediment brought out by the system in the normal production of oilfields. It is a solid waste rich in mineral oil. The main components are crude oil, mud and water. The size of solid particles can range from less than microns to several inches, most of which are between 1 and 100 microns. The composition of oil depends on the type of crude oil, refinery structure and operating conditions. The composition of sludge may change over time. Usually sludge contains a certain concentration of crude oil (5% to 80%), heavy metal ions (such as iron, copper, nickel, etc.) and inorganic salts (5% to 20%) compounds. These oil sludges generally contain benzene series, phenols, citron...

Claims

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Application Information

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IPC IPC(8): C02F11/10
CPCY02W10/40
Inventor 赵昕回军赵景霞
Owner CHINA PETROLEUM & CHEM CORP
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