Method and device for removing coal dust and oil by enabling coal to be directly liquefied and generate sulphur-bearing waste water

Abstract

The invention discloses a method and a device for removing coal dust and oil by enabling coal to be directly liquefied and generate sulphur-bearing waste water in the technical field of coal conversion. The method and the device can avoid deposition blocking of the coal dust in a stripping tower, reduce loads of a steam stripping device and improve steam stripping effect, the running cycle of the device is prolonged, simultaneously recycling of dirty oil is facilitated, the processing loss of the device is reduced, and the economic benefit of the device is improved. Besides, a micro cyclone separator and a cyclone deoiler which are adopted in the device are high in separating efficiency, long in continuous running cycle, small in occupied area, high in impact resistance and simple to operate and maintain. The method and the device are characterized in that the device for removing the coal dust and the oil by enabling the coal to be directly liquefied and generate the sulphur-bearing waste water comprises an adjusting tank, a sewage pump, the micro cyclone separator, a precision filter, the cyclone deoiler and the stripping tower; and sewage finally enters into the stripping tower to be treated after the sewage is treated by the adjusting tank, the sewage pump, the micro cyclone separator, the precision filter and the cyclone deoiler.

Description

technical field [0001] The invention belongs to the technical field of coal conversion, and in particular relates to a process and equipment for removing coal powder and oil by utilizing the direct liquefaction reaction of coal to generate sulfur-containing sewage. Background technique [0002] China is a country rich in coal and low in oil, with rich coal resources and a complete range of coal types. Coal resources account for 92% of energy reserves. This determines that my country's energy production and consumption will still be dominated by coal for a long period of time. However, the bituminous coal-type pollution caused by coal combustion has brought serious problems to my country's ecological environment. With the increase of total energy consumption, the total demand for coal has also increased. Under such circumstances, it is difficult to significantly reduce coal consumption. Can do it. Not only that, the center of gravity of my country's energy distribution is wes...

AI Technical Summary

Problems solved by technology

Filtration uses a filter to collect oil, which requires regular backwashing; gravity sedimentation is to place sulfur-containing sewage in a large tank, and after a period of time, the oil floating on the upper layer is collected to achieve the purpose of separation. The driving force for two-phase separation is only one gravitational acceleration, so the oil stays for a long time, and the equipment is bulky, occupies a large area, and operates discontinuously

[0007] Disclosed on September 27, 2006, the Chinese patent with the publication number CN1837069, the treatment method of oily and sulfurous sewage, uses the oily and sulfurous sewage as water for ball mixing of sintering materials in wet cement plants, but due to the need for matching There are wet-process cement plants, so the promotion and application are of little significance

[0008] The Chinese patent published on April 21, 2010 with the publication number CN101696516A, a surface treatment method for no-clean solar germanium substrates, discloses a method of using a sulfide conversion agent in sulfur-containing sewage to convert sulfide in water into Elemental sulfur, but due to the complex composition of sulfur-containing sewage, the sulfur-containing sewage of different devices is very different. Even the same device will change with the change of upstream working conditions, which has caused problems for the development and selection of sulfide conversion agents. very difficult, if not impossible

[0009] A Chinese patent with the publication number CN1542915 published on November 3, 2004, a p-Zn 1-x Mg x O crystal film and its preparation method discloses a method for degreasing sulfur-containing sewage by swirling. However, due to serious oil-water emulsification in sulfur-containing sewage, emulsified oil accounts for a relatively large proportion. This invention patent does not consider emulsified oil. It is difficult to separate emulsified oil in sulfur-containing sewage by purely mechanical methods

However, if the filter is used alone, the solid particles in the sulfur-containing sewage will easily cause the filter to be blocked, and the filter element needs to be cleaned or replaced frequently, which will affect the long-term operation of the device. The operation fluctuation of the stripper affects the stripping effect

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