Method and apparatus for processing effluvial tail gas of heavy slop tank

Abstract

The invention provides a method for treating mephitic tail gas of a heavy waste sump tank. The invention is characterized in that: the mephitic tail gas from a sweeping device on a heavy waste sump tank pipeline is cooled by an air cooler to a range of between 96 and 100 DEG C, and sent to the heavy waste sump tank for storage; gas is extracted from the heavy waste sump tank and is sent into a condenser for cooling by controlling a temperature below 50 DEG C; the tail gas is subject to the absorbing and deodorizing treatment by an absorbent in an absorption tower, and is subject to the deodorizing treatment by the absorbent in a Venturi jet to lift power; and finally, the treated tail gas is exhausted through a blowdown pipe. The invention also discloses a corresponding treatment device. The device has the advantages of large treating capacity, good treatment effect, simple structure and reasonable process so as to achieve the emission standard for odor pollutants.

Description

technical field [0001] The invention belongs to the field of petrochemical environmental protection, in particular to a method for treating foul-smelling tail gas of heavy dirty oil tanks and a related device. Background technique [0002] The stench produced by heavy dirty oil tanks is a chronic disease of oil refineries. Heavy dirty oil tanks have fixed and intermittent odor emissions. The main components of the bad smell are hydrogen sulfide, mercaptans, sulfides, and non-methane hydrocarbons. The composition is complex. According to the analysis data, the hydrogen sulfide in the exhaust gas of the heavy dirty oil tank is as high as 1000--5000mg / m 3 , the content of methyl mercaptan, ethanethiol and propanethiol is also high (mercaptan content 2-150ppm), non-methane hydrocarbon gas is as high as 5000ppm, of which oil and gas account for the majority. When the upstream device is purging the line after deoiling, a large amount of high-temperature purge steam enters the was...

AI Technical Summary

Problems solved by technology

In China, solid adsorption is also used to treat the odorous tail gas of heavy oil tanks, but a large amount of oil and gas can easily lead to the deactivation of the adsorbent, and the accumulation of oil in the adsorbent can easily cause the pressure drop of the bed to rise

What's more serious is that because the deodorizing adsorbent contains Ca and Fe components, it is easy to react with hydrogen sulfide to form ferrous sulfide, which will lead to spontaneous combustion and even explosion accidents.

Chinese utility model patent odor control device, the publication number is CN200520042029.2 discloses a device for treating malodorous gas, but for the following reasons, the odor treatment device cannot be directly used for the treatment of odorous tail gas in heavy dirty oil tanks

①. The heavy dirty oil pipeline is operated intermittently during oil removal and equipment steam purging. Sometimes the purge steam is as high as tens of tons, which is easy to cause the phenomenon of tank leakage and stench. The existing deodorization process cannot solve the problem of blowing. Odor caused by gas blowing out of the tank during sweeping; ②. Since the temperature of the purging steam is as high as 300°C, a large amount of steam, oil gas and malodorous gas enter the deodorization device, and the deodorization load is heavy, and the separated oil and hydrocarbons are not removed in time, resulting in the deodorization agent ③. Due to the different scales of refining and chemical plants, the units of the purging devices are different, the purge volume is uncertain, and the design scale of the deodorization device is difficult to determine. ④. The safety risks of negative pressure collapsed tanks and tank explosions must be solved to ensure the safe operation of deodorization facilities

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