CN111097252A - Device for removing volatile organic compounds in coal-charging flue gas of coke oven - Google Patents
Device for removing volatile organic compounds in coal-charging flue gas of coke oven Download PDFInfo
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- CN111097252A CN111097252A CN201811250782.9A CN201811250782A CN111097252A CN 111097252 A CN111097252 A CN 111097252A CN 201811250782 A CN201811250782 A CN 201811250782A CN 111097252 A CN111097252 A CN 111097252A
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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
- B01D53/02—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 adsorption, e.g. preparative gas chromatography
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The invention discloses a device for removing volatile organic compounds in coal-charging flue gas of a coke oven, which comprises a main pipeline, a quantitative feeding mechanism, a bag type dust collector, a variable frequency fan, a chimney and a controller, wherein the main pipeline is connected with the quantitative feeding mechanism; the quantitative feeding mechanism is used for feeding an adsorbent for adsorbing volatile organic matters into the main pipeline; the bag type dust collector is connected with the tail end of the main pipeline, one end of the variable frequency fan is connected with the bag type dust collector, and the other end of the variable frequency fan is connected with the chimney; when the rotating speed of the variable frequency fan is greater than a set value, the controller controls the quantitative feeding mechanism to feed; when the rotating speed is less than the set value, the controller controls the quantitative feeding mechanism to stop feeding; the main pipeline is connected with an online monitor, the controller can calculate the feeding amount of the quantitative feeding mechanism according to the concentration of the volatile organic compounds measured by the online monitor, and the controller controls the feeding of the quantitative feeding mechanism according to the feeding amount. The device for removing the volatile organic compounds in the coal-charging flue gas of the coke oven can effectively remove the volatile organic compounds in the coal-charging flue gas.
Description
Technical Field
The invention relates to a coke oven coal-charging dust removal device, in particular to a device for removing volatile organic compounds in coke oven coal-charging flue gas.
Background
Volatile Organic Compounds (VOCs) are important precursors for forming PM2.5 and ozone, enhance the control of the volatile organic compounds and NOx, and are important ways for realizing the continuous reduction of the concentration of the PM2.5 and inhibiting the ozone pollution. In addition, most of the volatile organic compounds can damage the human nervous system, cardiovascular system, immune system and the like, and have great influence on human health and social environment. Therefore, reducing volatile organic emissions is yet another goal of atmospheric pollution control.
The coal charging process in the coking process refers to the process of feeding pulverized coal into a coking chamber of a coke oven from a charging hopper of a coal charging car after the pulverized coal is prepared according to certain requirements. Therefore, in the process of charging coal into the carbonization chamber, a large amount of toxic and harmful smoke dust, which contains high tar components, flocculent floating substances, water and a large amount of volatile organic compounds, is emitted into the air from the top discharge hole of the furnace top and the top of the furnace door at the side of the furnace. In order to reduce the gas overflowing from the coke oven during the coal feeding period as much as possible, the coke oven generally adopts a mode that the gas around the fed coal is sucked into a main collecting pipeline through negative pressure and then is uniformly sent into a ground dust removal station for post-treatment and then is discharged outside so as to reduce pollution. However, the existing dust removing equipment has poor treatment effect on volatile organic compounds, so that a large amount of volatile organic compound gas is directly discharged into the atmosphere.
Aiming at the problems in the prior art, the device for removing the volatile organic compounds in the coal-charging flue gas of the coke oven is of great significance.
Disclosure of Invention
In order to solve the problems, the invention provides a device for removing volatile organic compounds in coal-charging flue gas of a coke oven, which can effectively remove the volatile organic compounds in the coal-charging flue gas.
In order to achieve the aim, the device for removing volatile organic compounds in the coal-charging flue gas of the coke oven comprises a main pipeline for collecting the coal-charging flue gas, a quantitative feeding mechanism, a bag type dust collector, a variable frequency fan, a chimney and a controller;
the quantitative feeding mechanism is connected with the main pipeline and is used for feeding an adsorbent capable of adsorbing volatile organic compounds in the coal-charging flue gas into the main pipeline; the bag type dust collector is connected with the tail end of the main pipeline, one end of the variable frequency fan is connected with the bag type dust collector, and the other end of the variable frequency fan is connected with the chimney; when the rotating speed of the variable frequency fan is greater than a set value, the controller controls the quantitative feeding mechanism to feed; when the rotating speed of the variable frequency fan is smaller than a set value, the controller controls the quantitative feeding mechanism to stop feeding;
the main pipeline is connected with a volatile organic compound on-line monitor for the concentration of volatile organic compounds in the coal-charging flue gas, the volatile organic compound on-line monitor is used for entering the main pipeline, the controller can calculate the feeding amount of the quantitative feeding mechanism in unit time according to the concentration of the volatile organic compounds in the coal-charging flue gas measured by the volatile organic compound on-line monitor, and the controller controls the feeding amount of the quantitative feeding mechanism.
Preferably, the dosing mechanism comprises a first storage bin for storing the adsorbent and a weightlessness scale, and the first storage bin is used for quantitatively conveying the adsorbent to the main pipeline through the weightlessness scale.
Preferably, the device also comprises a conveying pipeline, a second storage bin for storing the coke powder and a Roots blower, wherein one end of the conveying pipeline is connected with the main pipeline, the other end of the conveying pipeline is connected with the Roots blower, the second storage bin and the quantitative feeding mechanism are both connected with the conveying pipeline, and a gas-solid mixer for fully mixing the coke powder, the adsorbent and the air is arranged on the conveying pipeline.
Preferably, the amount of material dosed by said dosing mechanism per unit time is calculated by the following formula:
wherein Q is the feeding amount of the quantitative feeding mechanism, and the unit is kg/h, and η is the empirical coefficient of the addition of the adsorbent;
the concentration of volatile organic compounds in the coal-charging flue gas is characterized by non-methane total hydrocarbon and has the unit of mg/m3(ii) a V is the flow velocity of the coal-charging flue gas in the main pipeline, and the unit is m/s; a is the sectional area of the main pipeline position where the volatile organic compound on-line monitor is located, and the unit is m2。
Preferably, the adsorbent is a carbon-based adsorbent.
According to the device for removing the volatile organic compounds in the coal-charging flue gas of the coke oven, the adsorbent for adsorbing the volatile organic compounds is conveyed into the main pipeline through the quantitative feeding mechanism, so that the volatile organic compounds in the coal-charging flue gas can be effectively removed; meanwhile, the variable frequency fan, the volatile organic compound online monitor and the controller are arranged, so that the adsorbent can be conveyed to the main pipeline regularly and quantitatively, the dust removal effect is ensured, and the waste of materials is avoided.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for removing volatile organic compounds from coal-charging flue gas of a coke oven according to the present invention.
Detailed Description
The structure, operation, and the like of the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1, the device for removing volatile organic compounds in the coal-charging flue gas of the coke oven of the invention comprises a main pipeline 1 for collecting the coal-charging flue gas, a quantitative feeding mechanism, a bag type dust collector 3, a variable frequency fan 4, a chimney 5 and a controller 6.
The dosing mechanism is connected to the main pipe 1 for feeding an adsorbent, preferably a carbon-based adsorbent, capable of adsorbing volatile organic compounds in the coal-charging flue gas to the main pipe 1. The bag type dust collector 3 is connected with the tail end of the main pipeline 1 and used for receiving coal-charging flue gas conveyed by the main pipeline 1, one end of the variable frequency fan 4 is connected with the bag type dust collector 3, the other end of the variable frequency fan is connected with the chimney 5, the coal-charging flue gas enters the bag type dust collector 3 for dust removal, and purified gas is discharged to the atmosphere through the variable frequency fan 4 through the chimney 5.
The controller 6 can control the dosing mechanism to deliver the adsorbent to the main pipe 1 in a timed and quantitative manner. Specifically, when the coke oven is not charged with coal, the variable frequency fan runs at a low speed; when the coke oven is used for charging coal, the variable frequency fan 4 needs to operate at a high speed for removing a large amount of dust, and when the rotating speed of the variable frequency fan 4 is greater than a set value, the controller 6 controls the quantitative feeding mechanism to feed materials for saving materials; when the rotating speed of the variable frequency fan 4 is less than a set value, the controller 6 controls the quantitative feeding mechanism to stop feeding, and the quantitative feeding mechanism feeds intermittently, so that the balance between the removal of volatile organic compounds and the consumption of the adsorbent can be achieved, and the waste of the adsorbent is avoided. The set value can be obtained empirically.
Be connected with the volatile organic compounds on-line monitoring appearance 2 that is arranged in measuring the concentration of the volatile organic compounds that get into in the coal-charging flue gas of trunk line 1 on trunk line 1, volatile organic compounds on-line monitoring appearance 2 can set up in the position that is close to trunk line 1, and controller 6 can be according to the volatile organic compounds concentration calculation of the volatile organic compounds in the coal-charging flue gas that volatile organic compounds on-line monitoring appearance 2 records the feed quantity of fixed quantity feed mechanism in the unit interval, and controller 6 is according to the feed quantity control feeding of fixed quantity feed mechanism. Wherein, the feeding amount of the quantitative feeding structure in unit time can be calculated by the following formula:
wherein Q is the feeding amount of the quantitative feeding mechanism in unit time, and the unit is kg/h, η is the experience coefficient of the addition of the adsorbent, and is obtained by experience;
the concentration of volatile organic compounds in the coal-charging flue gas is characterized by non-methane total hydrocarbon and has the unit of mg/m3The volatile organic compound is measured by a volatile organic compound online monitor 2; v is the flow velocity of the coal-charging flue gas in the main pipeline 1, and the unit is m/s, and the flow velocity can be measured by a gas flowmeter; a is the sectional area of the main pipeline 1 position where the volatile organic compound on-line monitor 2 is located, and the unit is m2。
The dosing mechanism may comprise a first storage bin 7 for storing the adsorbent and a weightless scale, the first storage bin 7 delivering the adsorbent to the main conduit 1 via the weightless scale. The weightless scale is an existing device, preferably, the weightless scale comprises a weighing hopper 8 and a screw feeder 9, a weighing sensor is arranged in the weighing hopper 8, the weighing sensor can send weighing data of the weighing sensor to a controller 6, the controller 6 calculates the feeding rate of the weighing hopper 8 according to the weighing data, compares the feeding rate with the calculated feeding amount of the quantitative feeding mechanism in unit time, and controls the rotating speed of the screw feeder 9 according to the comparison result, so that the screw feeder 9 feeds according to the calculated feeding amount in unit time. When the materials in the weighing hopper 8 reach the lower weighing limit, the controller 6 controls a feeding valve (not shown in the figure) of the first storage bin 7 to be opened, and the first storage bin 7 feeds the weighing hopper 8; when the material in the weighing hopper 8 reaches the upper weighing limit, the controller 6 controls the feeding valve of the first storage bin 7 to be closed, and the first storage bin 7 stops discharging.
Because the flue gas generated during the coal charging of the coke oven contains a large amount of tar and other viscous components, when the tar-containing flue gas passes through the cloth bag of the bag type dust collector 3, the tar and other viscous components can be adhered to the surface of the cloth bag, the dust collection effect is seriously influenced, the cloth bag needs to be replaced in time, and the equipment cost is increased.
In order to prevent the surfaces of the cloth bags from being bonded and prolong the service life of the bag type dust collector 3, the device for removing volatile organic compounds in the coal-charging flue gas of the coke oven further comprises a conveying pipeline 12, a second storage bin 10 for storing coke powder and a Roots blower 11, one end of the conveying pipeline 12 is connected with the main pipeline 1, the other end of the conveying pipeline is connected with the Roots blower 11, the second storage bin 10 and a quantitative feeding mechanism are both connected with the conveying pipeline 12, and a gas-solid mixer for fully mixing the coke powder, an adsorbent and air is arranged on the conveying pipeline 12.
The second storage bin 10 can be connected with a controller 6, when the coke oven is charged with coal, the controller 6 can control the second storage bin 10 and the quantitative feeding mechanism to simultaneously feed the conveying pipeline 12, the Roots blower 11 generates air with certain pressure, coke powder discharged from the second storage bin 10 into the conveying pipeline 12 and the adsorbent discharged from the quantitative feeding mechanism into the conveying pipeline 12 are sent into the gas-solid mixer to be fully mixed and then sent into the main pipeline 1 to be dedusted, the adsorbent can remove a part of volatile organic compounds in the coal-charged flue gas in the main pipeline 1, the coke powder and the adsorbent enter the bag type deduster 3 from the main pipeline 1 to be subjected to gas-solid separation, a layer of filter membrane mixed with the adsorbent and the coke powder can be formed on the surface of the cloth bag, the filter membrane can prevent viscous components such as tar from adhering to the surface of the cloth bag and can continuously remove a part of volatile organic compounds in the coal-charged flue gas, the flue gas purified by the bag type deduster 3 is discharged into the atmosphere through a chimney 5 by the frequency conversion blower, the adsorbent and the coke powder discharged from the lower part of the bag type dust collector 3 can be sent to a sintering furnace or a blast furnace for reutilization, the volatile organic compounds adsorbed by the adsorbent are decomposed at high temperature in the high-temperature stage in the reutilization process, the heat value is also utilized, and secondary pollution is avoided.
According to the device for removing the volatile organic compounds in the coal-charging flue gas of the coke oven, the adsorbent for adsorbing the volatile organic compounds is conveyed into the main pipeline 1 through the quantitative feeding mechanism, so that the volatile organic compounds in the coal-charging flue gas can be effectively removed; meanwhile, by arranging the variable frequency fan 4, the volatile organic compound online monitor 2 and the controller 6, the adsorbent can be conveyed to the main pipeline 1 regularly and quantitatively, so that the dust removal effect is ensured, and the waste of materials is avoided.
The foregoing is merely illustrative of the present invention, and it will be appreciated by those skilled in the art that various modifications may be made without departing from the principles of the invention, and the scope of the invention is to be determined accordingly.
Claims (5)
1. A device for removing volatile organic compounds in coal-charging flue gas of a coke oven is characterized by comprising a main pipeline for collecting the coal-charging flue gas, a quantitative feeding mechanism, a bag type dust collector, a variable frequency fan, a chimney and a controller;
the quantitative feeding mechanism is connected with the main pipeline and is used for feeding an adsorbent capable of adsorbing volatile organic compounds in the coal-charging flue gas into the main pipeline; the bag type dust collector is connected with the tail end of the main pipeline, one end of the variable frequency fan is connected with the bag type dust collector, and the other end of the variable frequency fan is connected with the chimney; when the rotating speed of the variable frequency fan is greater than a set value, the controller controls the quantitative feeding mechanism to feed; when the rotating speed of the variable frequency fan is smaller than a set value, the controller controls the quantitative feeding mechanism to stop feeding;
the main pipeline is connected with a volatile organic compound on-line monitor for measuring the concentration of volatile organic compounds in the coal-charging flue gas entering the main pipeline, the controller can calculate the feeding amount of the quantitative feeding mechanism in unit time according to the concentration of the volatile organic compounds in the coal-charging flue gas measured by the volatile organic compound on-line monitor, and the controller controls the feeding amount of the quantitative feeding mechanism.
2. The apparatus of claim 1, wherein the dosing mechanism comprises a first storage bin for storing the sorbent and a weight loss scale, and the first storage bin is used for quantitatively delivering the sorbent to the main pipe through the weight loss scale.
3. The apparatus according to claim 1, further comprising a transportation pipeline, a second storage bin storing the coke powder, and a roots blower, wherein one end of the transportation pipeline is connected to the main pipeline, the other end of the transportation pipeline is connected to the roots blower, the second storage bin and the dosing mechanism are both connected to the transportation pipeline, and a gas-solid mixer for thoroughly mixing the coke powder, the adsorbent, and the air is disposed on the transportation pipeline.
4. The apparatus according to claim 1, wherein the amount of the dosing mechanism per unit time is calculated by the following formula:
wherein Q is the feeding amount of the quantitative feeding mechanism, and the unit is kg/h, and η is the empirical coefficient of the addition of the adsorbent;
the concentration of volatile organic compounds in the coal-charging flue gas is characterized by non-methane total hydrocarbon and has the unit of mg/m3(ii) a V is the flow velocity of the coal-charging flue gas in the main pipeline, and the unit is m/s; a is the sectional area of the main pipeline position where the volatile organic compound on-line monitor is located, and the unit is m2。
5. The apparatus according to claim 1, wherein the adsorbent is a carbon-based adsorbent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811250782.9A CN111097252A (en) | 2018-10-25 | 2018-10-25 | Device for removing volatile organic compounds in coal-charging flue gas of coke oven |
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| CN201811250782.9A CN111097252A (en) | 2018-10-25 | 2018-10-25 | Device for removing volatile organic compounds in coal-charging flue gas of coke oven |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111545003A (en) * | 2020-05-20 | 2020-08-18 | 山东大学 | Method for purifying tar in carbon electrode roasting furnace flue gas |
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Application publication date: 20200505 |