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A steam purging tail gas treatment process and complete set of equipment
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A technology for exhaust gas treatment and complete set of devices, applied in the direction of vapor condensation, separation method, dispersed particle separation, etc., can solve the problems of unusable electric heaters, unrecyclable pollutants, no movable treatment devices, etc., and achieves explosion-proof level. Improve and solve the problem of exhaust emission control and the effect of convenient installation and maintenance
Active Publication Date: 2019-11-12
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
However, it also has the problem that the pollutants cannot be recycled, and the concentrated gas on the retentate side needs to be processed by other technologies
Low-temperature catalytic oxidation technology (patent number CN103721510A) is the core process, which requires electric heating equipment to reach the initial temperature of catalytic oxidation, while petrochemical enterprises, especially oil refining enterprises, have high safety requirements, and electric heaters cannot be used
To sum up, there is no mobile treatment device developed for the tail gas generated during the shutdown and maintenance process of refining and chemical enterprises
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Embodiment 1
[0103] Treatment of refinery hexene production units, raw material storage tanks and waste oil storage tanks steam purge tail gas, steam purge tail gas composition (volume fraction) water vapor 78%, nitrogen 14%, hydrocarbons 8%. Hydrocarbons mainly include alkanes, olefins and a small amount of aromatics and halogenated hydrocarbons. The total gas flow rate is 400~500m 3 / h, the operating conditions of the membrane module and low-temperature catalytic oxidation are shown in Table 1 below, and the process results are shown in Table 2:
[0104] Table 1, Device Operating Conditions
[0105]
[0106]
[0107] Table 2, process treatment results (gas composition and concentration in each section)
[0108]
Embodiment 2
[0110] Treatment of steam purge tail gas after shutdown of catalytic cracking unit and waste oil storage tank in refinery. The steam purge tail gas composition (volume fraction) is 68% water vapor, 19% nitrogen, and 13% hydrocarbons. Hydrocarbons mainly include alkanes, olefins, aromatics, ethers, and halogenated hydrocarbons, as well as sulfur-containing components such as hydrogen sulfide and mercaptans. The total gas flow is 200~400m 3 / h, process parameters such as temperature, pressure, and flow of the membrane module and low-temperature catalytic oxidation are shown in Table 1 below, the total gas composition, total non-methane hydrocarbons and the concentration of representative components, and the process treatment results are shown in Table 2:
[0111] Table 1, Device Operating Conditions
[0112]
[0113]
[0114] Table 2, process flow processing results (gas composition and concentration in each section)
[0115]
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Abstract
The invention relates to a process and complete-set apparatus for treatment of tail gases generated during steam blowing. The apparatus comprises a condensation heat exchanger, a three-phase separator, a mixing tank, a vacuum pump, a compression and condensation unit, a gas-liquid separator, membrane assembly, a heat exchanger and a low-temperature catalytic oxidation reactor. The tail gases generated during steam blowing are firstly cooled in the condensation heat exchanger, then the cooled tail gases enter the three-phase separator, and primary separation is performed in the three-phase separator to obtain dirt oil, waste water and waste gases, the separated dirt oil is stored in an oil storage tank, the separated waste water is treated in a sewage pipe network, and the separated waste gases are recycled and treated in a process device integrating a compression and condensation process, a membrane separation process and a low-temperature catalytic oxidation process. According to the invention, when the apparatus is used, higher-value organic materials in the tail gases can be recycled, and the emission indexes of the tail gases can be satisfied, and meanwhile, no electric heating systems are used, so that the explosion-proof grade of the apparatus is improved, and skid-mounted mobile design is adopted, so that requirements of starting the apparatus near petrochemical enterprise equipment can be satisfied, and on-site processing of the tail gases is realized.
Description
technical field [0001] The invention relates to a steam purging tail gas treatment process and a complete set of equipment, which are mainly used in the treatment of steam purging tail gas during shutdown and maintenance of petrochemical enterprises. Specifically, it is a kind of optimization and improvement of condensing oil and gas recovery technology, membrane oil and gas recovery technology and low-temperature catalytic oxidation treatment technology, and after coupling, the steam purge tail gas treatment process and the process of shutting down the petrochemical enterprise are formed. Related kits. Background technique [0002] With the improvement of the country's economic level and the transformation of people's ideas, the environmental protection indicators of petrochemical enterprises such as oil refining and chemical industry have been continuously improved. Tail gas emissions from petrochemical enterprises are divided into organized emissions and unorganized emis...
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