CN112107970A - Device and method for treating VOCs in storage tank - Google Patents
Device and method for treating VOCs in storage tank Download PDFInfo
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- CN112107970A CN112107970A CN201910529007.5A CN201910529007A CN112107970A CN 112107970 A CN112107970 A CN 112107970A CN 201910529007 A CN201910529007 A CN 201910529007A CN 112107970 A CN112107970 A CN 112107970A
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- vocs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
- B01D53/228—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion characterised by specific membranes
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C4/00—Flame traps allowing passage of gas but not of flame or explosion wave
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
- F23G5/46—Recuperation of heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
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Abstract
The invention discloses a VOCs treatment device in a storage tank, which comprises a storage tank, a membrane separation device, a flameless combustion device and a waste heat recovery device; the invention also discloses a method for treating VOCs in the storage tank, which is characterized in that an outlet is formed in the top of the storage tank and is connected with the membrane separation device through a pipeline, a first air pump is further arranged on the pipeline between the outlet and the membrane separation device, and the first air pump is further connected with a pressure interlock arranged on the top of the storage tank. The invention realizes oil-gas treatment by membrane separation and flameless combustion, thereby reducing the difficulty of oil-gas treatment; the energy waste heat of combustion is recovered, the purpose of effective utilization of energy is achieved, and the method is safe, efficient and environment-friendly.
Description
Technical Field
The invention relates to the technical field of treatment of VOCs in a storage tank, in particular to a device and a method for treating VOCs in the storage tank.
Background
VOCs (volatile organic compounds) refers to organic compounds having a saturated vapor pressure of more than 133.32Pa at normal temperature and a boiling point of 50-260 ℃ at normal pressure, or any organic solid or liquid capable of volatilizing at normal temperature and normal pressure.
At present, the pollution caused by VOCs of the underground oil tank of the gas station and the storage tank of the refinery tank field is serious, and primary, secondary and tertiary oil gas recovery technologies are mostly adopted at present, so that the oil gas of the underground oil tank of the gas station and the storage tank of the refinery tank field is recovered and treated, and waste is changed into wealth. At present, three recovery technologies such as an adsorption method, an absorption method and a condensation method are commonly used, and the common problems are as follows: the treatment difficulty is high, the treatment is not thorough, the waste heat recovery and reutilization can not be realized, and the treatment rate is low.
Disclosure of Invention
In order to solve the technical problems of high treatment difficulty and incomplete treatment of the VOCs in the storage tank, the invention discloses a device and a method for treating the VOCs in the storage tank.
In order to achieve the purpose, the invention adopts the following technical scheme:
a device for treating VOCs in a storage tank comprises the storage tank, a membrane separation device, a flameless combustion device and a waste heat recovery device; an outlet is formed in the top of the storage tank and connected with the membrane separation device through a pipeline, a first air suction pump is further arranged on the pipeline between the outlet and the membrane separation device, and the first air suction pump is further connected with a pressure interlock arranged on the top of the storage tank.
As a further preferred aspect of the present invention, the membrane separation device is provided with a calorific value analyzer, the calorific value analyzer monitors the concentrated VOCs in the membrane separation device in real time, and the calorific value analyzer is connected to a valve on a natural gas inlet pipeline.
As a further preferred aspect of the present invention, a second air extracting pump and a flame arrester are further disposed on a pipeline connecting the membrane separation device and the flameless combustion device, and the flameless combustion device is connected with the waste heat recovery device.
As a further preferred aspect of the present invention, the inlet end of the flame arrester is connected to the flameless combustion device, and the connecting line is further provided with a pressure gauge.
As a further preference of the present invention, the membrane separation device is a common membrane separation process equipment including steam permeation, gas membrane separation and membrane contactors.
As a further preferred aspect of the present invention, the waste heat recovery apparatus may supply heat to a heating facility or a waste heat power generation facility.
As a further preferred aspect of the present invention, the flameless combustion device is a bunsen burner.
A treatment method of VOCs in a storage tank uses the treatment device of VOCs in the storage tank, and comprises the following steps:
(1) when the amount of VOCs in the storage tank is large, the air pressure in the storage tank rises, the first air pump can be started by pressure interlocking, the first air pump pumps out gas on the upper part of the storage tank and conveys the gas to a membrane separation device through a pipeline, VOCs are concentrated in the membrane separation device, a heat value analyzer arranged on the membrane separation device monitors the concentrated VOCs in real time, and the separated clean air is discharged out of the membrane separation device;
(2) and the concentrated VOCs in the membrane separation device or the concentrated VOCs and supplemented natural gas are conveyed to the flameless combustion device through the second air pump, the oxidation reaction is completed in the flameless combustion device, and the waste heat recovery device performs subsequent waste heat recovery to realize energy recycling.
As a further preferred aspect of the present invention, the calorific value analyzer monitors the concentrated VOCs in the membrane separation device in real time, if the calorific value reaches 8500-12000J/m3Above, thenThe valve on the natural gas inlet pipeline is kept closed, and the VOCs concentrated in the membrane separation device are conveyed into the flameless combustion device through the second air extraction pump;
as a further preferred aspect of the present invention, the calorific value analyzer monitors the concentrated VOCs in the membrane separation device in real time, if the calorific value is lower than 8500-12000J/m3Then the valve on the natural gas inlet pipeline is opened to supplement natural gas to make the heat value reach 8500-3The above.
The invention has the advantages that the oil-gas treatment is realized by the membrane separation and flameless combustion, the problem of serious pollution of VOCs of the underground oil tank of the gas station and the storage tank of the refinery tank field at the present stage is solved, and the difficulty of the oil-gas treatment is obviously reduced by the treatment mode; meanwhile, the waste heat of the combustion energy can be recovered through a waste heat recovery device, so that the aim of effectively utilizing energy is fulfilled; the invention can reduce the burden of VOCs in the storage tank to the environment to the maximum extent, and compared with the three-time oil gas recovery technology at the present stage, the invention has the advantages of safety, high efficiency, environmental protection and smaller burden to the environment.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the flameless combustion device of the present invention coupled to a flame arrestor;
wherein, 1-a storage tank; 2-pressure interlocking; 3-a first air pump; 4-a membrane separation device; 5-heat value analyzer; 6-a valve; 7-a second air pump; 8-a flameless combustion device; 9-a waste heat recovery device; 10-a flame arrester; 11-pressure gauge.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
As shown in fig. 1, the device for treating VOCs in the storage tank comprises a storage tank 1, a membrane separation device 4, a flameless combustion device 8 and a waste heat recovery device 9; an outlet is formed in the top of the storage tank 1 and is connected with the membrane separation device 4 through a pipeline, a first air pump 3 is further arranged on the pipeline between the outlet and the membrane separation device 4, the first air pump 3 is used for conveying gas on the upper portion of the storage tank 1 to the membrane separation device 4, and the first air pump 3 is further connected with a pressure interlock 2 arranged on the top of the storage tank 1.
Particularly, a heat value analyzer 5 is installed on the membrane separation device 4, the heat value analyzer 5 monitors the heat value of the concentrated VOCs in the membrane separation device 4 in real time, the heat value analyzer 5 is connected with a valve 6 on a natural gas inlet pipeline, and when the valve 6 is opened, the concentrated VOCs can be supplemented with the heat value.
Particularly, a second air extracting pump 7 and a flame arrester 10 are further arranged on a pipeline connecting the membrane separation device 4 and the flameless combustion device 8, the flameless combustion device 8 is connected with a waste heat recovery device 9, and the waste heat recovery device 9 realizes energy recovery and reutilization.
Particularly, the inlet end of the flame arrester 10 is connected with the flameless combustion device 8, the connecting pipeline is also provided with a pressure gauge 11, the flame arrester 10 is arranged mainly for preventing backfire in the flameless combustion device 8, the pressure gauge 11 or a pressure system is arranged mainly for an automatic ignition system after pressure interlocking 2 is established with the flameless combustion device 8, when combustible gas is led to the flameless combustion device, automatic ignition is started, and after ignition is finished, the automatic ignition can be stopped
In particular, the membrane separation device 4 is a common membrane separation process device, including Vapor Permeation (VP), gas membrane separation (GMS/VMP), membrane contactor (membrane contactor), and the like, and is also used in various large plants.
In particular, the waste heat recovery device 9 can be used directly for supplying heat to a heating facility or a waste heat power generation facility.
In particular, the flameless combustion device 8 is a Bunsen burner, so that the combustion efficiency is high and the pollution is very small.
Example 1
A treatment method of VOCs in a storage tank uses the treatment device of VOCs in the storage tank, and comprises the following steps:
(1) when the amount of VOCs in the storage tank 1 is large, the air pressure in the storage tank 1 rises, the first air pump 3 can be started by the pressure interlock 2, the air at the upper part of the storage tank 1 is pumped out by the first air pump 3 and is conveyed to the membrane separation device 4 through a pipeline, VOCs are concentrated in the membrane separation device 4, a heat value analyzer 5 arranged on the membrane separation device 4 monitors the concentrated VOCs in real time, and the separated clean air is discharged out of the membrane separation device 4;
(2) the concentrated VOCs in the membrane separation device 4 or the concentrated VOCs and the supplemented natural gas are conveyed to the flameless combustion device 8 through the second air pump 7, the oxidation reaction is completed in the flameless combustion device 8, and the waste heat recovery device 9 performs subsequent waste heat recovery to realize energy recycling.
Specifically, the calorific value analyzer 5 monitors the concentrated VOCs in the membrane separation device 4 in real time, and is classified into the following two cases:
(1) if the calorific value reaches 9000J/m3When the pressure rises, the valve 6 on the natural gas inlet pipeline is kept closed, and the concentrated VOCs in the membrane separation device 4 are conveyed into the flameless combustion device 8 through the second air pump 7;
(2) if the calorific value is less than 9000J/m3Then the valve on the natural gas inlet pipeline is opened, and the natural gas is supplemented to make the heat value reach 9000J/m3The above steps are carried out.
Example 2
A treatment method of VOCs in a storage tank uses the treatment device of VOCs in the storage tank, and comprises the following steps:
(1) when the amount of VOCs in the storage tank 1 is large, the air pressure in the storage tank 1 rises, the first air pump 3 can be started by the pressure interlock 2, the air at the upper part of the storage tank 1 is pumped out by the first air pump 3 and is conveyed to the membrane separation device 4 through a pipeline, VOCs are concentrated in the membrane separation device 4, a heat value analyzer 5 arranged on the membrane separation device 4 monitors the concentrated VOCs in real time, and the separated clean air is discharged out of the membrane separation device 4;
(2) the concentrated VOCs in the membrane separation device 4 or the concentrated VOCs and the supplemented natural gas are conveyed to the flameless combustion device 8 through the second air pump 7, the oxidation reaction is completed in the flameless combustion device 8, and the waste heat recovery device 9 performs subsequent waste heat recovery to realize energy recycling.
Specifically, the calorific value analyzer 5 monitors the concentrated VOCs in the membrane separation device 4 in real time, and is classified into the following two cases:
(1) if the calorific value reaches 11000J/m3When the pressure rises, the valve 6 on the natural gas inlet pipeline is kept closed, and the concentrated VOCs in the membrane separation device 4 are conveyed into the flameless combustion device 8 through the second air pump 7;
(2) if the calorific value is less than 11000J/m3Then the valve on the natural gas inlet pipeline is opened, and the natural gas is supplemented to make the heat value reach 11000J/m3The above steps are carried out.
Example 3
A treatment method of VOCs in a storage tank uses the treatment device of VOCs in the storage tank, and comprises the following steps:
(1) when the amount of VOCs in the storage tank 1 is large, the air pressure in the storage tank 1 rises, the first air pump 3 can be started by the pressure interlock 2, the air at the upper part of the storage tank 1 is pumped out by the first air pump 3 and is conveyed to the membrane separation device 4 through a pipeline, VOCs are concentrated in the membrane separation device 4, a heat value analyzer 5 arranged on the membrane separation device 4 monitors the concentrated VOCs in real time, and the separated clean air is discharged out of the membrane separation device 4;
(2) the concentrated VOCs in the membrane separation device 4 or the concentrated VOCs and the supplemented natural gas are conveyed to the flameless combustion device 8 through the second air pump 7, the oxidation reaction is completed in the flameless combustion device 8, and the waste heat recovery device 9 performs subsequent waste heat recovery to realize energy recycling.
Further, the calorific value analyzer 5 monitors the concentrated VOCs in the membrane separation device 4 in real time, and the monitoring is divided into the following two cases:
(1) if the calorific value reaches 12000J/m3When the pressure rises, the valve 6 on the natural gas inlet pipeline is kept closed, and the concentrated VOCs in the membrane separation device 4 are conveyed into the flameless combustion device 8 through the second air pump 7;
(2) if the calorific value is less than 12000J/m3On the natural gas inlet pipelineThe valve is opened, natural gas is supplemented to ensure that the heat value reaches 12000J/m3The above steps are carried out.
The invention realizes oil-gas treatment by membrane separation and flameless combustion, solves the problem of serious pollution of VOCs of the underground oil tank of the gas station and the storage tank of the refinery tank field at the present stage, and obviously reduces the difficulty of oil-gas treatment by the treatment mode; meanwhile, the waste heat of the combustion energy can be recovered through a waste heat recovery device, so that the aim of effectively utilizing energy is fulfilled; the invention can reduce the burden of VOCs in the storage tank to the environment to the maximum extent, and compared with the three-time oil gas recovery technology at the present stage, the invention has the advantages of safety, high efficiency, environmental protection and smaller burden to the environment.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (10)
1. A device for treating VOCs in a storage tank is characterized by comprising the storage tank, a membrane separation device, a flameless combustion device and a waste heat recovery device; an outlet is formed in the top of the storage tank and connected with the membrane separation device through a pipeline, a first air suction pump is further arranged on the pipeline between the outlet and the membrane separation device, and the first air suction pump is further connected with a pressure interlock arranged on the top of the storage tank.
2. The apparatus according to claim 1, wherein the membrane separation device is equipped with a thermal value analyzer, the thermal value analyzer monitors the concentrated VOCs in the membrane separation device in real time, and the thermal value analyzer is connected to a valve on a natural gas inlet line.
3. The apparatus for treating VOCs in a storage tank of claim 2, wherein the pipeline connecting the membrane separation device and the flameless combustion device is further provided with a second air pump and a flame arrester, and the flameless combustion device is connected with the waste heat recovery device.
4. The apparatus of claim 3, wherein the flame arrestor is connected to the flameless combustion device at an inlet end thereof, and a pressure gauge is disposed in the connecting line.
5. The in-tank VOCs treatment apparatus of claim 3, wherein said membrane separation unit is a common membrane separation process equipment comprising vapor permeation, gas membrane separation and membrane contactors.
6. The apparatus of claim 3, wherein the heat recovery unit provides heat to a heating facility or a cogeneration facility.
7. The apparatus of claim 4, wherein the flameless combustion device is a bunsen burner.
8. A method for treating VOCs in-tank using the apparatus as claimed in any one of claims 1 to 7, wherein the method comprises the steps of:
(1) when the amount of VOCs in the storage tank is large, the air pressure in the storage tank rises, the first air pump can be started by pressure interlocking, the first air pump pumps out gas on the upper part of the storage tank and conveys the gas to a membrane separation device through a pipeline, VOCs are concentrated in the membrane separation device, a heat value analyzer arranged on the membrane separation device monitors the concentrated VOCs in real time, and the separated clean air is discharged out of the membrane separation device;
(2) and the concentrated VOCs in the membrane separation device or the concentrated VOCs and supplemented natural gas are conveyed to the flameless combustion device through the second air pump, the oxidation reaction is completed in the flameless combustion device, and the waste heat recovery device performs subsequent waste heat recovery to realize energy recycling.
9. The method of claim 8, wherein the VOCs are disposed in a tankThe heat value analyzer monitors the VOCs concentrated in the membrane separation device in real time, and if the heat value reaches 8500-3And (3) keeping the valve on the natural gas inlet pipeline closed, and conveying the concentrated VOCs in the membrane separation device into the flameless combustion device through the second air extraction pump.
10. The method as claimed in claim 8, wherein the thermal value analyzer monitors the concentrated VOCs in the membrane separation device in real time, and if the thermal value is lower than 8500-3Then the valve on the natural gas inlet pipeline is opened to supplement natural gas to make the heat value reach 8500-3The above.
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