CN107489883B - Method for collecting and conveying VOCs (volatile organic chemicals) of petrochemical enterprises - Google Patents
Method for collecting and conveying VOCs (volatile organic chemicals) of petrochemical enterprises Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
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- F17D1/065—Arrangements for producing propulsion of gases or vapours
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/12—Arrangements for supervising or controlling working operations for injecting a composition into the line
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/18—Arrangements for supervising or controlling working operations for measuring the quantity of conveyed product
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Abstract
The invention belongs to the technical field of industrial tail gas treatment, and relates to a method for collecting and conveying VOCs of petrochemical enterprises. The method for collecting and conveying VOCs of petrochemical enterprises, provided by the invention, has the concentration of VOCs less than or equal to 25000mg/m3Is conveyed to the mixer through a collecting line; the concentration of VOCs is more than 25000mg/m3And the concentration of VOCs is less than or equal to 50000mg/m3The gas is diluted by a dilution pipeline and then is conveyed into a mixer; the concentration of VOCs is more than 50000mg/m3The gas is treated by a pretreatment device and then is conveyed into a mixer; the output of VOCs emission point passes through the collection pipeline with the input intercommunication of blender, the collection pipeline on set up VOCs concentration monitor and spark arrester. The invention can ensure the safety of petrochemical enterprises in the processes of collecting, conveying and processing VOCs, and is beneficial to unified centralized processing.
Description
Technical Field
The invention belongs to the technical field of industrial tail gas treatment, relates to a method for collecting and conveying VOCs gas, and particularly relates to a method for collecting and conveying VOCs of petrochemical enterprises.
Background
VOCs (volatile Organic compounds) refer to volatile Organic compounds, mainly comprise hydrocarbons, aromatic hydrocarbons, alcohols, aldehydes, ketones, lipids, amines, Organic acids and the like, have the characteristics of strong volatilization, special odor, irritation, toxicity and the like, can badly affect the ecological environment and can cause serious harm to human health, industrial discharge is a main VOCs pollution source, for example, VOCs discharge sources of typical petrochemical enterprises mainly comprise ① crude oil, finished oil loading and unloading areas and tank area discharge gases, ② sewage treatment field waste gases, ③ sweetening and coking device tail gases, ④ acid water treatment waste gases, ⑤ chemical products benzene, toluene, xylene and the like in a triphenyl tank area, ⑥ ethylene, propylene, butylene, butadiene and other olefin areas, ⑦ ethylene oxide, propylene oxide and other basic raw material areas, and the like.
At present, VOCs (volatile organic compounds) collection and treatment of petrochemical enterprises are carried out by breaking each VOCs, namely, different emission sources are collected and treated by different methods according to different types and concentrations of VOCs emission, and the treatment is mainly divided into two types of treatment and unified collection treatment. The former establishes a treatment facility near the discharge point of VOCs, carries out on-site treatment, generally adopts technologies such as absorption method, adsorption method and the like to realize the removal of VOCs, and can be combined with other technologies to remove H in the exhaust gas2S、RSH、CS2And the sulfur-containing substances, such as low-temperature diesel oil washing, alkali liquor desulfurization or low-temperature diesel oil washing and membrane separation technology, are adopted, so that most of VOCs and sulfur-containing compounds in the exhaust gas are effectively removed. But the dispersion treatment has the following defects: 1) under the condition of more and dispersed discharge points, the construction period of the on-site treatment facility is long, the investment is large, and the VOCs treatment cost of the enterprise is increased; 2) some VOCs discharge points of petrochemical enterprises are like oil tank field, acid water tank field and liquefied gas sweetening unit etc. VOCs's emission concentration is high, concentration fluctuation range is big, and current processing facility is often difficult to effectively get rid of the VOCs under this kind of condition, and the VOCs concentration is still high in the tail gas after the processing, can't reach emission standard. The unified treatment is that VOCs of all main discharge points are collected through a pipeline in a unified mode and then are treated in a centralized mode. At present, technologies such as a catalytic oxidation method, a Regenerative Thermal Oxidation (RTO) method, a thermal combustion method, an incineration method and the like are generally adopted, and the method has the greatest advantages that the removal rate of VOCs is high, the fluctuation of the concentration of the VOCs in the exhaust gas can be adapted, the standard emission is realized, and in addition, if VOCs are treated by utilizing the existing devices in enterprises, the standard emission can be realizedSo as to greatly reduce the investment cost and the operation cost for treating the VOCs and improve the economic benefit of enterprises.
Since VOCs discharged from petrochemical enterprises are generally various hydrocarbon compounds, and some of the discharged gas also contains a small amount of hydrogen, oxygen, sulfide, and the like, the safety in the process of uniform collection, transportation and treatment is an important factor to be considered first when a uniform treatment technology is adopted. Therefore, research and development of a safe VOCs collecting and conveying method have important significance for ensuring the safety of VOCs at each discharge point of an enterprise in the collecting, conveying and processing processes.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a method for collecting and conveying VOCs of petrochemical enterprises, which is safe and effective, can ensure the safety of enterprises in the processes of collecting, conveying and processing VOCs, and is beneficial to unified centralized processing.
The second purpose of the invention is to provide a VOCs collecting and conveying system for petrochemical enterprises, which has the advantages of good safety, stable and reliable operation, simple structure, low cost and strong practicability.
The third purpose of the invention is to provide a centralized processing system for VOCs in petrochemical enterprises, which can fully ensure the safety of different VOCs discharge points in the process of collecting, conveying and processing VOCs, and has the advantages of stable and reliable operation, simple structure, low cost and strong practicability.
In order to achieve the purpose, the invention adopts the technical scheme that:
according to one aspect of the invention, the invention provides a method for collecting and conveying VOCs of petrochemical enterprises, which is to ensure that the concentration of VOCs is less than or equal to 25000mg/m3Is conveyed to the mixer through a collecting line;
the concentration of VOCs is more than 25000mg/m3And the concentration of VOCs is less than or equal to 50000mg/m3The gas is diluted by a dilution pipeline and then is conveyed into a mixer;
the concentration of VOCs is more than 50000mg/m3The gas is delivered after being processed by the pretreatment deviceFeeding to a mixer;
the output of VOCs emission point passes through the collection pipeline with the input intercommunication of blender, the collection pipeline on set up VOCs concentration monitor and spark arrester.
As a further preferable technical scheme, the concentration of VOCs is less than or equal to 10000mg/m3Is conveyed to the mixer through a collecting line; preferably, the concentration of VOCs is less than or equal to 8000mg/m3Is conveyed to the mixer through a collecting line;
preferably, the gas containing VOCs containing sulfide is treated by a sulfide treatment device until the content of sulfide is less than 0.03 v%, and the concentration of VOCs is less than or equal to 25000mg/m3Then the mixture is conveyed to a mixer through a collecting pipeline, preferably the content of sulfide is less than 0.02 v%, and the concentration of VOCs is less than or equal to 10000mg/m3More preferably, the content of sulfide is less than 0.01 v%, and the concentration of VOCs is less than or equal to 8000mg/m3。
As a further preferable technical scheme, two branch lines are arranged on the collecting line and respectively comprise a nitrogen purging line and an air diluting line; or the collecting pipeline is provided with an air dilution pipeline branch line, the branch line is connected with an auxiliary pipeline in parallel, and the auxiliary pipeline and the branch line are both provided with valves;
preferably, a flow meter is arranged on the branch line or the air dilution line;
preferably, the pressure of the VOCs is 2.0kPa above the air pressure during dilution of the VOCs with the air dilution line.
As a further preferred technical scheme, the content of oxygen in the gas in the process of collecting and conveying the VOCs is less than or equal to 3 percent, preferably the content of oxygen is less than or equal to 1.5 percent, and further preferably the content of oxygen is less than or equal to 0.5 percent.
Preferably, the pressure during the collection and transportation of the VOCs gas is micro-positive pressure or micro-negative pressure;
more preferably, the pressure during the collection and transportation of the VOCs is in the range of-20 kPa to-0.1 kPa or 0.1kPa to 20kPa, preferably-10 kPa to-0.5 kPa or 0.5kPa to 10kPa, and more preferably-5 kPa to-1 kPa or 1kPa to 5 kPa.
As a advanceThe step optimization technical scheme is that the concentration of VOCs output by the output end of the mixer is less than or equal to 25000mg/m3Preferably less than or equal to 10000mg/m3More preferably 8000mg/m or less3。
As a further preferable technical scheme, the output end of the mixer is connected with a VOCs treatment device through a compressor, and the pressure of the VOCs after being compressed by the compressor is 0.1MPa to 0.6MPa, preferably 0.2MPa to 0.5MPa, and further preferably 0.4MPa to 0.5 MPa;
preferably, flame arresters are arranged at the front and the rear of the compressor;
preferably, a buffer tank is provided between the mixer and the compressor.
As a further preferred technical scheme, the temperature of the VOCs gas before entering the VOCs treatment device is less than or equal to 200 ℃, and when the temperature of the VOCs gas is more than 200 ℃, normal-temperature air is adopted for dilution and cooling until the temperature of the VOCs gas is less than or equal to 200 ℃.
In accordance with another aspect of the present invention, there is also provided a petrochemical enterprise VOCs collection and delivery system comprising at least one point of discharge of VOCs and a mixer;
the output end of the VOCs discharge point is communicated with the input end of the mixer through a collecting pipeline, and a VOCs concentration monitor and a flame arrester are arranged on the collecting pipeline;
the collecting pipeline is provided with at least one branch line, and the branch line comprises a dilution pipeline;
the collecting pipeline is connected with the pretreatment device.
As a further preferred technical scheme, the collecting pipeline is also connected with a sulfide treatment device;
preferably, two branch lines are arranged on the collecting line and are respectively a nitrogen purging line and an air diluting line; or the collecting pipeline is provided with an air dilution pipeline branch line, the branch line is connected with an auxiliary pipeline in parallel, and the auxiliary pipeline and the branch line are both provided with valves;
preferably, a one-way valve is provided between the flame arrestor and the mixer.
According to another aspect of the invention, the invention further provides a centralized processing system for VOCs of petrochemical enterprises, which comprises the above-mentioned collection and conveying system for VOCs of petrochemical enterprises.
Compared with the prior art, the invention has the beneficial effects that:
1. the method effectively controls the concentration of the VOCs in the VOCs gas collection and conveying process, effectively controls safety risks such as explosion, combustion and the like in the conveying process, ensures the safety of the VOCs at each VOCs discharge point in the collection and conveying process, is favorable for unified management, has strong integration and low cost, and can effectively protect the environment.
2. The invention provides a VOCs collecting and conveying system and a centralized processing system for petrochemical enterprises, which are characterized in that VOCs discharged from each VOCs discharge point are collected by a pipe network, conveyed to a mixer and fully mixed, and then conveyed to a VOCs processing device for processing, so that the safety of VOCs in the collecting, conveying and processing processes is ensured in the whole process, the operation is stable and reliable, the structure is simple, the operation is easy, the control is convenient, the cost is low, the practicability is strong, and the environmental protection is facilitated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a centralized processing system for VOCs of petrochemical enterprises according to the present invention.
Icon: 1-discharge point of VOCs; 2-a mixer; 3-a compressor; 4-a catalytic cracking regenerator; 5-a buffer tank; 6-flame arrestors; 7-a collection line; 8-air dilution line branch; 9-nitrogen purge line secondary line; 10-a valve; 11-a one-way valve; 12-flow meter.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to embodiments and examples, but those skilled in the art will understand that the following embodiments and examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In a first aspect, the present embodiment provides a method for collecting and transporting VOCs in petrochemical enterprises, which comprises the step of adjusting the concentration of VOCs to 25000mg/m or less3Is conveyed to the mixer through a collecting line;
the concentration of VOCs is more than 25000mg/m3And the concentration of VOCs is less than or equal to 50000mg/m3The gas is diluted by a dilution pipeline and then is conveyed into a mixer;
the concentration of VOCs is more than 50000mg/m3The gas is treated by a pretreatment device and then is conveyed into a mixer;
the output of VOCs emission point passes through the collection pipeline with the input intercommunication of blender, the collection pipeline on set up VOCs concentration monitor and spark arrester.
At present, the VOCs of petrochemical enterprises is collected in a unified way and treated, wherein the VOCs discharged by the enterprises is sent into a catalytic cracking regenerator to be directly combusted, so that the technology is a brand-new, efficient and economic VOCs treatment technology, the VOCs of different types and concentrations can be rapidly and effectively treated, the emission requirement is met, the investment and operation cost for treating the VOCs of the petrochemical enterprises can be greatly reduced, and the technology has great significance for improving the environmental benefit and the economic benefit of the enterprises. The invention provides a safe VOCs collecting and conveying method aiming at the technology of directly burning and treating VOCs by a catalytic cracking regenerator, which is mainly based on the discharge characteristics of VOCs of petrochemical enterprises and aims at the VOCs treating technology by the catalytic cracking regenerator. In addition, the invention is not only suitable for the direct combustion treatment process of VOCs entering a catalytic cracking regenerator in petrochemical enterprises, but also suitable for other similar occasions and industrial fields with unified collection and transportation requirements on VOCs.
Because VOCs discharged by petrochemical enterprises are various hydrocarbon compounds generally, some discharged gas also contains a small amount of hydrogen, oxygen, sulfide and the like; and the VOCs of petrochemical enterprises are discharged from a plurality of sources, the hydrocarbon compounds in the VOCs composition have larger property difference, and the VOCs in general enterprises are mostly C5And the following hydrocarbons, the production and loading and unloading zone of the triphenyl will have benzene, toluene, xylene, etc., and there are safety risks of explosion, combustion, etc. during the collection and transportation process, therefore, the safety during the unified collection, transportation and handling process is an important factor to be considered first.
Therefore, the invention achieves the purpose of safe collection and transportation by strictly controlling factors such as explosion limit, ignition point, self-ignition point and the like of each component in the VOCs, and adopts methods such as concentration control far below the explosion limit, temperature control below the self-ignition point and the like to ensure the safety of the VOCs. That is, effectively control the concentration of VOCs in VOCs collection and transportation process, the VOCs of different concentrations adopts different modes to handle, reaches the concentration that meets the requirements after, mixes and subsequent processing in sending into the blender again to fully guarantee the security of VOCs in collection and transportation process.
The concentration of VOCs in the present invention is expressed as non-methane total hydrocarbons (NMHC, in mg/m)3) And (4) showing.
Further, the concentration of VOCs is less than or equal to 10000mg/m3Is conveyed to the mixer through a collecting line; preferably, the concentration of VOCs is less than or equal to 8000mg/m3Is conveyed to the mixing device through a collecting pipelineIn the device;
preferably, the gas containing VOCs containing sulfide is treated by a sulfide treatment device until the content of sulfide is less than 0.03 v%, and the concentration of VOCs is less than or equal to 25000mg/m3Then the mixture is conveyed to a mixer through a collecting pipeline, preferably the content of sulfide is less than 0.02 v%, and the concentration of VOCs is less than or equal to 10000mg/m3More preferably, the content of sulfide is less than 0.01 v%, and the concentration of VOCs is less than or equal to 8000mg/m3。
In the invention, the concentration of VOCs before entering the mixer can be less than or equal to 25000mg/m3Preferably less than or equal to 10000mg/m3More preferably 8000mg/m or less3Within this concentration range, the safety of collection and transport can be ensured, it being possible to transport it directly into the mixer via the collection line. If the concentration of VOCs is more than 25000mg/m3And is less than or equal to 50000mg/m3Then, a dilution pipeline is opened in a chain way to dilute the concentration of the VOCs to be less than or equal to 25000mg/m3Or 8000mg/m3Then, the mixture is conveyed into a mixer through a collecting pipeline, and the dilution factor depends on the monitored concentration of VOCs; if the concentration of VOCs is more than 50000mg/m3Pretreatment is needed to recover most of oil gas, the pretreatment method can be low-temperature diesel oil absorption method, adsorption method, membrane separation method and the like, and the concentration of VOCs in the pretreated gas is less than or equal to 25000mg/m3And then conveyed to the mixer through a collecting pipeline.
In addition, some of the gases discharged from each discharge point of VOCs may also contain H2S、RSH、CS2And the sulfur-containing substances, the sulfide-containing VOCs gas is pretreated by alkali washing or other methods so that the sulfide content is less than 0.03 v%, preferably less than 0.02 v%, and more preferably less than 0.01 v%, and then sent to the mixer.
Furthermore, two branch lines are arranged on the collecting line and are respectively a nitrogen purging line and an air diluting line; or the collecting pipeline is provided with an air dilution pipeline branch line, the branch line is connected with an auxiliary pipeline in parallel, and the auxiliary pipeline and the branch line are both provided with valves;
preferably, a flow meter is arranged on the branch line or the air dilution line;
preferably, the pressure of the VOCs is 2.0kPa above the air pressure during dilution of the VOCs with the air dilution line.
The auxiliary pipeline is a nitrogen purging pipeline, and the nitrogen purging pipeline is used for cleaning a pipe network, removing impurities such as residues in the pipe network and the like, and preventing inflammable and explosive substances from remaining in the pipe. The air dilution line is arranged to dilute the concentration of VOCs when the concentration of VOCs is more than 25000mg/m3And is less than or equal to 50000mg/m3And when the air dilution pipeline is opened, the VOCs is introduced into the air dilution pipeline, and the pressure of the VOCs is higher than the air pressure by more than 2.0kPa in the dilution process.
Further, the oxygen content in the gas during the collection and transportation process of the VOCs gas is less than or equal to 3%, preferably less than or equal to 1.5%, and more preferably less than or equal to 0.5%.
Preferably, the pressure during the collection and transportation of the VOCs gas is micro-positive pressure or micro-negative pressure;
more preferably, the pressure during the collection and transportation of the VOCs is in the range of-20 kPa to-0.1 kPa or 0.1kPa to 20kPa, preferably-10 kPa to-0.5 kPa or 0.5kPa to 10kPa, and more preferably-5 kPa to-1 kPa or 1kPa to 5 kPa.
The emission sources of VOCs are divided into two categories: one is a low-oxygen discharge source, which is generally a nitrogen-sealed storage tank, such as an acid water tank, a dirty oil and sewage tank, a raw material tank, a product tank and the like, and the discharged VOCs contain no oxygen or very low oxygen; the other is a high oxygen emission source, the oxygen content in the discharged gas is higher, generally more than 3%, such as liquefied gas sweetening tail gas, malodorous gas treatment tail gas, sewage treatment plant tail gas and the like, and the oxygen content in the VOCs gas discharged from an oil product loading and unloading area and a sewage treatment plant is higher and almost all is air. According to the invention, different control measures are adopted in the VOCs collecting and conveying process according to different emission sources, so that the safety is ensured. If the oxygen content of the gas is greater than 3%, the oxygen content of the gas is controlled to be less than or equal to 3%, preferably less than or equal to 1.5%, and more preferably less than or equal to 0.5% during the collection and transportation. If the oxygen content in the gas is more than 3 percent, the concentration of VOCs is controlled to be less than or equal to 8000mg/m3. In addition, in the collecting and conveying process, the pressure of the pipe network before the gas enters the mixer needs to be controlled to be micro positive pressure or micro negative pressure.
Further, the concentration of VOCs output by the output end of the mixer is less than or equal to 25000mg/m3Preferably less than or equal to 10000mg/m3More preferably 8000mg/m or less3。
Further, the output end of the mixer is connected with a VOCs treatment device through a compressor, and the pressure of the VOCs after being compressed by the compressor is 0.1-0.6 MPa, preferably 0.2-0.5 MPa, and further preferably 0.4-0.5 MPa;
preferably, flame arresters are arranged at the front and the rear of the compressor;
preferably, a buffer tank is provided between the mixer and the compressor.
Further, the temperature of the VOCs gas before entering the VOCs treatment device is less than or equal to 200 ℃, and when the temperature of the VOCs gas is more than 200 ℃, normal-temperature air is adopted for dilution and cooling until the temperature of the VOCs gas is less than or equal to 200 ℃.
Further, N is arranged between the compressor and the VOCs treatment device2And (4) bypassing.
VOCs discharged from each VOCs discharge point reaches a preset concentration, enters a mixer for full mixing, then enters a VOCs treatment device (which can be a catalytic cracking device) through a compressor, and flame arresters are arranged at the front and the rear of the compressor; if VOCs directly enter the catalytic cracking device, when the temperature of the mixed gas of the VOCs is higher than 200 ℃, the mixed gas is immediately diluted by normal-temperature nitrogen, a flame arrester is started to prevent heat from returning, and when the pressure of the mixed gas of the VOCs is lower than a set value, N is opened2By-pass, supplement N2Maintaining a certain pressure to prevent the material from returning back; when the concentration of VOCs is greater than the control value, N is turned on2By-pass, supplement N2I.e. to ensure that in any accidental case the normal operation of the catalytic cracking unit is not affected.
In a second aspect, the present embodiments provide a petrochemical enterprise VOCs collection and delivery system comprising at least one point of discharge of VOCs and a mixer;
the output end of the VOCs discharge point is communicated with the input end of the mixer through a collecting pipeline, and a VOCs concentration monitor and a flame arrester are arranged on the collecting pipeline;
the collecting pipeline is provided with at least one branch line, and the branch line comprises a dilution pipeline;
the collecting pipeline is connected with the pretreatment device.
Further, the collecting pipeline is also connected with a sulfide treatment device;
preferably, two branch lines are arranged on the collecting line and are respectively a nitrogen purging line and an air diluting line; or the collecting pipeline is provided with an air dilution pipeline branch line, the branch line is connected with an auxiliary pipeline in parallel, and the auxiliary pipeline and the branch line are both provided with valves;
preferably, a one-way valve is provided between the flame arrestor and the mixer.
Furthermore, a flow meter is arranged on the collecting pipeline, and a flow meter is arranged on the air dilution pipeline.
The VOCs concentration monitor is preferably an online VOCs analyzer, the automation degree is high, and the operation and the control are convenient. Meanwhile, the arrangement of the flame arrester can further ensure the safety of collection and transportation, and the safety degree is high.
In a third aspect, the present embodiment provides a centralized processing system for VOCs in petrochemical enterprises, including the above-mentioned collection and transportation system for VOCs in petrochemical enterprises.
The centralized treatment system for VOCs in petrochemical enterprises in the embodiment comprises a collection and conveying system for VOCs in petrochemical enterprises, a compressor, a VOCs treatment device and the like, wherein the VOCs treatment device is preferably a catalytic cracking device. It should be noted that the centralized processing system for VOCs in a petrochemical enterprise may further include other devices and pipelines, and the other devices involved in the system are all existing devices. The key in this embodiment is that the processing system includes the petrochemical enterprise VOCs collection and delivery system of the present invention.
The invention will be further illustrated with reference to the following specific examples and the accompanying drawings.
Example 1
A method for collecting and conveying VOCs of petrochemical enterprises comprises the following steps:
(a) the VOCs discharged by a sweetening device of refinery-liquefied gas is collected, and the concentration of the VOCs is 89500mg/m3Flow rate of 150m3H, after low-temperature diesel oil absorption and alkali washing pretreatment, the concentration of VOCs is 12400mg/m3The tail gas enters a collecting pipeline;
(b) the air dilution pipeline is opened, and the air with 2 times of VOCs flow rate is diluted, namely the air flow rate is 300m3The concentration of diluted VOCs is 4133mg/m3；
(c) Introducing the VOCs gas diluted in the step (b) into a mixer, fully and uniformly collecting VOCs from each discharge point in the mixer, and keeping the vacuum degree in the mixer and the previous pipeline at-1.0 kPa;
(d) pressurizing the VOCs uniformly mixed by the mixer to 0.4-0.6 MPa, mixing the VOCs into a main air pipeline, and then feeding the VOCs into a catalytic cracking regenerator for combustion treatment;
(e) the concentration of VOCs in the regenerated flue gas after combustion is 15mg/m3And can be directly discharged.
Example 2
Unlike example 1, the method for collecting and transporting VOCs in petrochemical enterprises includes step (b), which is omitted in this example. That is, in this example, the concentration after the pretreatment in the step (a) was 12400mg/m3The VOCs gas is conveyed into the mixer to be fully and uniformly, and the vacuum degree in the mixer and the previous pipeline is kept at-3.0 kPa.
Example 3
A method for collecting and conveying VOCs of petrochemical enterprises comprises the following steps:
(a) collecting VOCs discharged from an oil product tank area of a refinery, wherein the concentration of the VOCs is 67000mg/m3At a flow rate of 500m3H; it contains SO 850ppm2And 210ppm NOX(ii) a After pretreatment, the concentration of VOCs in the tail gas is 4300mg/m3Entering a collection line;
(b) introducing the pretreated VOCs gas in the step (a) into a mixer, fully and uniformly mixing VOCs collected from each discharge point in the mixer, and keeping the vacuum degree in the mixer and the previous pipeline at-1.5 kPa;
(c) pressurizing the VOCs uniformly mixed by the mixer to 0.4-0.5 MPa, mixing the VOCs into a main air pipeline, and then entering a catalytic cracking regenerator coke burning tank for combustion treatment;
(d) the concentration of VOCs in the regenerated flue gas after combustion is 20mg/m3But because it contains SO2And NOXAnd the like, the NMHC and SO in the flue gas discharged after final purification are subjected to desulfurization and denitration by a regenerated flue gas treatment systemXAnd NOXAnd the emission can completely reach the standard.
Example 4
A method for collecting and conveying VOCs of petrochemical enterprises comprises the following steps:
(a) collecting VOCs discharged from the outlet of the malodorous gas treatment facility in the one-tank area of the refinery, wherein the concentration of the VOCs is 1030mg/m3Flow rate of 200m3H, oxygen content in the gas is 3.3 v%;
(b) the VOCs gas in step (a) enters a mixer, VOCs collected from each discharge point are fully and uniformly mixed in the mixer, and the concentration of VOCs in the mixer is 7300mg/m3The vacuum degree in the mixer and the previous pipeline is kept at-1.0 kPa;
(c) after the VOCs mixed uniformly by the mixer is pressurized to 0.6MPa, the VOCs directly enter a catalytic cracking regenerator for combustion treatment;
(d) the concentration of VOCs in the regenerated flue gas after combustion is 10mg/m3And can be directly discharged.
Example 5
As shown in fig. 1, the present embodiment provides a centralized processing system for VOCs in petrochemical enterprises, which includes at least one discharge point 1 for VOCs, a mixer 2, a compressor 3 and a catalytic cracking regenerator 4, and the present embodiment is further explained by taking three discharge points 1 for VOCs as an example.
The output end of the VOCs discharge point 1 is communicated with the input end of the mixer 2 through a collection pipeline 7, and the output end of the mixer 2 is connected with the catalytic cracking regenerator 4 through the compressor 3; a VOCs concentration monitor and a flame arrester 6 are arranged on the collecting pipeline 7; the collecting pipeline 7 is provided with at least one branch line which comprises a dilution pipeline; the collecting line 7 is connected to a pre-treatment device (not shown in the figure).
Further, the collecting line 7 is also connected to a sulphide treatment unit (not shown in the figure).
Furthermore, two branch lines, namely a nitrogen purging line and an air diluting line, are arranged on the collecting line 7; or the collecting pipeline 7 is provided with an air dilution pipeline branch line 8, the branch line is connected with a nitrogen purging pipeline secondary pipeline 9 in parallel, and the nitrogen purging pipeline secondary pipeline 9 and the air dilution pipeline branch line 8 are both provided with valves 10.
Further, a check valve 11 is provided between the flame arrester 6 and the mixer 2.
Further, a flow meter 12 is provided on the air dilution line branch line 8.
Further, flame arresters 6 are arranged at the front and the rear of the compressor 3.
Further, a buffer tank 5 is provided between the mixer 2 and the compressor 3.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (24)
1. A method for collecting and conveying VOCs of petrochemical enterprises is characterized in that the concentration of VOCs is less than or equal to 25000mg/m3Is conveyed to the mixer through a collecting line;
the concentration of VOCs is more than 25000mg/m3And the concentration of VOCs is less than or equal to 50000mg/m3The gas is diluted by a dilution pipeline and then is conveyed into a mixer;
the concentration of VOCs is more than 50000mg/m3Gas passing pretreatment deviceAfter treatment, conveying the mixture to a mixer, wherein the pretreatment comprises a low-temperature diesel oil absorption method, an adsorption method and a membrane separation method;
wherein, the VOCs gas is treated by alkali washing to ensure that the content of sulfide in the VOCs gas is less than 0.03v percent, and then is conveyed into a mixer,
the output of VOCs emission point passes through the collection pipeline with the input intercommunication of blender, the collection pipeline on set up VOCs concentration monitor and spark arrester.
2. The method for collecting and transporting VOCs in petrochemical enterprises or industrial facilities of claim 1, wherein the concentration of VOCs is less than or equal to 10000mg/m3Is conveyed to the mixer through a collecting line.
3. The method for collecting and transporting VOCs in petrochemical enterprises according to claim 2, wherein the concentration of VOCs is 8000mg/m or less3Is conveyed to the mixer through a collecting line.
4. The method for the collection and transportation of VOCs of a petrochemical enterprise of claim 1, wherein the sulfide content is less than 0.02 v%, and the concentration of VOCs is less than or equal to 10000mg/m3。
5. The method for the collection and transportation of VOCs of petrochemical enterprises and others of claim 4, wherein the content of sulfides is less than 0.01 v%, and the concentration of VOCs is less than or equal to 8000mg/m3。
6. The method for collecting and transporting VOCs of a petrochemical enterprise according to claim 1, wherein the collection pipeline is provided with two branch pipelines, namely a nitrogen purge pipeline and an air dilution pipeline; or the collecting pipeline is provided with an air dilution pipeline branch line, the branch line is connected with an auxiliary pipeline in parallel, and the auxiliary pipeline and the branch line are both provided with valves.
7. The method for collection and transportation of VOCs of a petrochemical enterprise of claim 6, wherein a flow meter is disposed in the branch line or the air dilution line.
8. The method of claim 6, wherein the pressure of the VOCs is higher than the air pressure by more than 2.0kPa during the dilution of the VOCs with the air dilution line.
9. The method for the collection and delivery of VOCs for petrochemical enterprises of claim 1 wherein the oxygen content of the gas during the collection and delivery of VOCs is less than or equal to 3%.
10. The method of claim 9, wherein the oxygen content of the gas during the collection and transportation of VOCs is less than or equal to 1.5%.
11. The method of claim 10, wherein the oxygen content of the gas during the collection and transportation of VOCs is less than or equal to 0.5%.
12. The method for the collection and delivery of VOCs in a petrochemical enterprise of claim 9, wherein the pressure during the collection and delivery of VOCs is slightly positive or negative.
13. The method for collection and transportation of VOCs from a petrochemical enterprise of claim 12, wherein the pressure range during the collection and transportation of VOCs gas is from-20 kPa to-0.1 kPa or from 0.1kPa to 20 kPa.
14. The method for collection and transportation of VOCs from a petrochemical enterprise of claim 13, wherein the pressure range during the collection and transportation of VOCs gas is from-10 kPa to-0.5 kPa or from 0.5kPa to 10 kPa.
15. The method for collection and transportation of VOCs in a petrochemical enterprise of claim 14, wherein the pressure range during collection and transportation of VOCs gases is from-5 kPa to-1 kPa or from 1kPa to 5 kPa.
16. The method of claim 1, wherein the output of the mixer has a concentration of VOCs less than or equal to 25000mg/m3。
17. The method of claim 16, wherein the output of the mixer has a concentration of VOCs less than or equal to 10000mg/m3。
18. The method of claim 17, wherein the concentration of VOCs output from the mixer is 8000mg/m or less3。
19. The method for collecting and conveying VOCs of petrochemical enterprises and enterprises according to any one of claims 1 to 18, wherein the output end of the mixer is connected with a VOCs treatment device through a compressor, and the pressure of the VOCs compressed by the compressor is 0.1MPa to 0.6 MPa.
20. The method of claim 19, wherein the pressure of the compressed VOCs in the petrochemical enterprise is 0.2MPa to 0.5 MPa.
21. The method of claim 20, wherein the pressure of the compressed VOCs in the petrochemical enterprise is 0.4MPa to 0.5 MPa.
22. The method of claim 19, wherein flame arrestors are provided before and after the compressor.
23. The method of claim 19, wherein a surge tank is disposed between the mixer and the compressor.
24. The method for collecting and transporting VOCs in a petrochemical enterprise according to claim 19, wherein the gas temperature of VOCs before entering the VOCs treatment device is less than or equal to 200 ℃, and when the gas temperature of VOCs is greater than 200 ℃, the gas temperature of VOCs is diluted and cooled to be less than or equal to 200 ℃ by using normal temperature air.
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| CN110389602B (en) * | 2018-04-19 | 2022-09-23 | 中国石油化工股份有限公司 | Method for controlling content of specific gas in target container |
| CN108572146B (en) * | 2018-05-19 | 2021-05-11 | 河北正态环境检测有限公司 | Automatic monitoring method and monitoring system for smoke pollutants |
| CN108872487B (en) * | 2018-07-08 | 2021-08-24 | 山西王牌网络科技有限公司 | Multi-pollutant online automatic monitoring device for atmosphere pollution source |
| CN109609219B (en) * | 2019-01-17 | 2020-11-24 | 青岛华世洁环保科技有限公司 | Coking tail gas treatment method and device |
| CN111088964A (en) * | 2019-12-19 | 2020-05-01 | 中国石油天然气股份有限公司 | Cluster well gas collection system and control method |
| KR102260840B1 (en) * | 2020-02-25 | 2021-06-07 | 주식회사 케이씨 | Gas Supply System |
| CN111522370B (en) * | 2020-04-30 | 2022-07-19 | 攀钢集团西昌钢钒有限公司 | Constant-pressure control system for tank |
| CN111578146B (en) * | 2020-05-26 | 2022-04-26 | 万若（北京）环境工程技术有限公司 | Negative pressure pipe network monitoring station of negative pressure conveying system and water column plug eliminating method |
| CN113446611A (en) * | 2021-06-24 | 2021-09-28 | 中海石油中捷石化有限公司 | VOCs (volatile organic compounds) emission treatment method for chemical and industrial laboratory analysis room |
| CN114939337A (en) * | 2022-04-11 | 2022-08-26 | 北京安星达环保技术发展有限公司 | Comprehensive treatment method for organic volatile matters of refining enterprises |
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| CN100496678C (en) * | 2006-04-25 | 2009-06-10 | 中国石油化工股份有限公司 | Combined purification method for effluvial exhaust air |
| JP4778403B2 (en) * | 2006-11-08 | 2011-09-21 | 日本リファイン株式会社 | A method and apparatus for purifying exhaust gas by collecting and concentrating VOC from exhaust gas containing VOC. |
| CN204903499U (en) * | 2015-08-13 | 2015-12-23 | 中国石油化工股份有限公司 | A safe preprocessing device for volatile organic compounds administers |
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