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Collection and delivery method of vocs in petrochemical enterprises
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An enterprise and petrochemical technology, applied in the field of VOCs collection and transportation in petrochemical enterprises, can solve the problems of increasing VOCs treatment costs, high VOCs emission concentration, and failure to meet emission standards, so as to achieve unified governance, environmental protection, and structure simple effect
Active Publication Date: 2020-03-31
CHINA PETROLEUM & CHEM CORP +1
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However, decentralized governance has the following disadvantages: 1) In the case of many and scattered discharge points, the construction period of on-site treatment facilities is long and the investment is large, which increases the cost of VOCs treatment for enterprises; 2) Some VOCs discharge points of petrochemical enterprises such as oil Product tank area, acid water tank area and liquefied gas sweetening unit, etc., the emission concentration of VOCs is high, and the concentration fluctuation range is large. It is often difficult for existing treatment facilities to effectively remove VOCs in this case. VOCs in the tail gas after treatment The concentration is still too high to meet the emission standards
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Embodiment 1
[0082] A method for collecting and transporting VOCs in a petrochemical enterprise, comprising the following steps:
[0083] (a) Collect the VOCs discharged from a liquefied gas sweetening unit in the refinery, and the VOCs concentration is 89500mg / m 3 , the flow rate is 150m 3 / h, after low-temperature diesel absorption and alkali washing pretreatment, the VOCs concentration is 12400mg / m 3 , the tail gas enters the collection pipeline;
[0084] (b) Open the air dilution line and dilute with 2 times the VOCs flow rate of air, that is, the air flow rate is 300m 3 / h, the diluted VOCs concentration is 4133mg / m 3 ;
[0085] (c) The VOCs gas diluted in step (b) enters the mixer, and the VOCs collected from each discharge point are fully uniform in the mixer, and the vacuum degree in the mixer and the previous pipeline is kept at -1.0kPa;
[0086] (d) After the VOCs mixed uniformly by the mixer are pressurized to 0.4-0.6 MPa, they are mixed into the main air pipeline, and then...
Embodiment 2
[0089] A method for collecting and transporting VOCs in a petrochemical enterprise is different from Embodiment 1 in that step (b) is omitted in this embodiment. That is, in the present embodiment, the concentration after pretreatment in step (a) is 12400mg / m 3 The VOCs gas is sent into the mixer fully and evenly, and the vacuum degree in the mixer and the previous pipeline is kept at -3.0kPa.
Embodiment 3
[0091] A method for collecting and transporting VOCs in a petrochemical enterprise, comprising the following steps:
[0092] (a) Collect the VOCs discharged from the first oil tank area of the refinery, and the VOCs concentration is 67000mg / m 3 , the flow rate is 500m 3 / h; which contains 850ppm of SO 2 and 210ppm NO X ; After pretreatment, the concentration of VOCs in the exhaust gas is 4300mg / m 3 , into the collection pipeline;
[0093] (b) The pretreated VOCs gas in step (a) enters the mixer, and the VOCs collected from each discharge point are fully uniform in the mixer, and the vacuum degree in the mixer and the previous pipeline is kept at -1.5kPa;
[0094] (c) After the VOCs mixed uniformly by the mixer are pressurized to 0.4-0.5MPa, they are mixed into the main air pipeline, and then enter the coking tank of the catalytic cracking regenerator for combustion treatment;
[0095] (d) The concentration of VOCs in the regenerated flue gas after combustion is 20mg / m ...
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Abstract
The invention belongs to the technical field of industrial exhaust gas treatment and relates to a method for collecting and conveying VOCs of petrochemical enterprises and a centralized processing system. The method for collecting and conveying VOCs of petrochemical enterprises, provided by the invention, comprises the following steps: conveying a gas in VOCs concentration of less than or equal to 25000mg / m3 into a mixer through a collecting pipeline; diluting the gas with the VOCs concentration of more than 25000mg / m3 but less than or equal to 50000mg / m3 by a diluting pipeline and then conveying into the mixer; adopting a pre-treating device for treating the gas with the VOCs concentration of more than 50000mg / m3 and then conveying into the mixer; connecting an output end of a VOCs emission point with an input end of the mixer through the collecting pipeline and arranging a VOCs concentration monitor and a flame arrester on the collecting pipeline. The method provided by the invention is capable of guaranteeing the safety of the petrochemical enterprises in the processes of collecting, conveying and treating VOCs and is beneficial to the uniform centralized treatment.
Description
technical field [0001] The invention belongs to the technical field of industrial tail gas treatment, and relates to a method for collecting and transporting VOCs gas, in particular to a method for collecting and transporting VOCs in a petrochemical enterprise. Background technique [0002] VOCs (Volatile Organic Compounds) refer to volatile organic compounds, mainly including hydrocarbons, aromatic hydrocarbons, alcohols, aldehydes, ketones, lipids, amines and organic acids, etc., which have strong volatility, special odor, irritation and Toxicity and other characteristics will not only badly affect the ecological environment, but also cause serious harm to human health. Industrial emission is the main source of VOCs pollution. For example, the VOCs emission sources of typical petrochemical enterprises mainly include: ① exhaust gas from crude oil and refined oil loading and unloading areas and tank farms; ② waste gas from sewage treatment plants; Acidic water treatment was...
Claims
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Application Information
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