CN113209724B - Method for trapping and removing benzopyrene in flue gas - Google Patents
Method for trapping and removing benzopyrene in flue gas Download PDFInfo
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- CN113209724B CN113209724B CN202110590674.1A CN202110590674A CN113209724B CN 113209724 B CN113209724 B CN 113209724B CN 202110590674 A CN202110590674 A CN 202110590674A CN 113209724 B CN113209724 B CN 113209724B
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- 239000003546 flue gas Substances 0.000 title claims abstract description 102
- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 101
- FMMWHPNWAFZXNH-UHFFFAOYSA-N Benz[a]pyrene Chemical compound C1=C2C3=CC=CC=C3C=C(C=C3)C2=C2C3=CC=CC2=C1 FMMWHPNWAFZXNH-UHFFFAOYSA-N 0.000 title claims abstract description 77
- 239000007788 liquid Substances 0.000 claims abstract description 100
- 239000007787 solid Substances 0.000 claims abstract description 27
- 239000002245 particle Substances 0.000 claims abstract description 23
- 239000000126 substance Substances 0.000 claims abstract description 21
- 239000007789 gas Substances 0.000 claims abstract description 17
- 230000005484 gravity Effects 0.000 claims abstract description 7
- 239000000779 smoke Substances 0.000 claims description 34
- 238000004140 cleaning Methods 0.000 claims description 13
- 238000007599 discharging Methods 0.000 claims description 11
- 240000004282 Grewia occidentalis Species 0.000 claims description 4
- 238000000462 isostatic pressing Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 230000001502 supplementation Effects 0.000 claims description 4
- 240000000218 Cannabis sativa Species 0.000 claims description 2
- 229920000742 Cotton Polymers 0.000 claims description 2
- 235000009120 camo Nutrition 0.000 claims description 2
- 235000005607 chanvre indien Nutrition 0.000 claims description 2
- 239000000835 fiber Substances 0.000 claims description 2
- 239000011487 hemp Substances 0.000 claims description 2
- 235000012765 hemp Nutrition 0.000 claims description 2
- 235000012766 marijuana Nutrition 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 230000000903 blocking Effects 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 28
- 230000000694 effects Effects 0.000 abstract description 6
- 239000005416 organic matter Substances 0.000 abstract description 3
- 239000000428 dust Substances 0.000 description 14
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000002844 melting Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 229910000975 Carbon steel Inorganic materials 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000003795 desorption Methods 0.000 description 4
- 239000010962 carbon steel Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000003595 mist Substances 0.000 description 3
- 230000037250 Clearance Effects 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- 239000002156 adsorbate Substances 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 230000035512 clearance Effects 0.000 description 2
- 230000002596 correlated Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000005067 remediation Methods 0.000 description 2
- TXVHTIQJNYSSKO-UHFFFAOYSA-N Benzo(e)pyrene Chemical compound C1=CC=C2C3=CC=CC=C3C3=CC=CC4=CC=C1C2=C34 TXVHTIQJNYSSKO-UHFFFAOYSA-N 0.000 description 1
- 241000287828 Gallus gallus Species 0.000 description 1
- 206010021143 Hypoxia Diseases 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 235000021168 barbecue Nutrition 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000000711 cancerogenic Effects 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 230000001146 hypoxic Effects 0.000 description 1
- 230000003116 impacting Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000000630 rising Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 229920001909 styrene-acrylic polymer Polymers 0.000 description 1
- 238000001926 trapping method Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/04—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia
- B01D45/08—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia by impingement against baffle separators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/18—Cleaning-out devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
Abstract
The invention relates to a method for trapping and removing benzopyrene in flue gas, which comprises the steps of selecting a special material trapping bundle, arranging the special material trapping bundle in a trapping and removing chamber in a multilayer manner, enabling the flue gas to generate turbulent flow impact when passing through a device, enabling benzopyrene in the flue gas and organic matter liquid drops associated with the benzopyrene to be adsorbed and captured when being impacted with the special trapping bundle, enabling the adsorbed liquid drops to flow into a liquid collecting tank under the action of gravity when being gathered to a certain amount, enabling liquid drops entrained in the flue gas to generate impact turbulent flow when passing through each layer of trapping bundle, and enabling the liquid drops, the liquid drops and solid particles to be impacted and combined to grow up. The density of the liquid drops is far greater than that of gas, when the gas flow collides with the trapping beam, the kinetic energy of the liquid drops is large, the inertia is large, when the gas flow collides with the trapping beam, the liquid drops break through a gas film and are in collision contact with the intercepting trapping beam, the surface of the adsorbing material and the adsorbed substance have small surface tension, and when the adsorbed substance is in collision contact with the trapping beam, the adsorbed substance is adsorbed and trapped by the surface of the trapping beam, so that the solid benzopyrene is trapped and removed, the temperature rise of the flue gas is avoided, and the energy-saving effect is achieved.
Description
Technical Field
The invention belongs to the field of environment-friendly flue gas treatment, and particularly relates to a method for trapping and removing benzopyrene in flue gas.
Background
Benzopyrene is an aromatic substance, and has a melting point: 178-179.3 ℃, boiling point: 310 ℃ and 312 ℃, is insoluble in water, and has a vapor pressure of 0.665 at 25 DEG C ×10-19And are non-direct highly carcinogenic substances. A large amount of benzopyrene is generated in furnaces for high-temperature hypoxic pyrolysis of organic matters such as coal and the like, coking, carbon, metallurgical sintering and refractory material production, a small amount of benzopyrene is also generated in daily barbecue and high-temperature cooking, and no good treatment method is provided at present. Patent No. 201320638838.4(22) proposes a treatment scheme which is difficult to be used for large-scale industrial flue gas treatment due to the complex operation, high cost and large resistance. It is imperative to develop new remediation methods to solve this high hazard gas remediation problem.
Disclosure of Invention
Aiming at the technical problems, the invention provides a method for trapping and removing benzopyrene in smoke.
The mechanism process is as follows: if the temperature of the flue gas is between 180 and 312 ℃, the benzopyrene is in a liquid state and can be captured by a gas-liquid separation method; if the temperature of the flue gas is lower than 178 ℃, the flue gas is solid particles which are very fine and difficult to capture by a conventional dust removal method. But when other associated low-melting-point organic matters exist, the solid benzopyrene can be adsorbed, bonded and captured simultaneously when other liquid organic matters are captured; the gas state is generated when the temperature is higher than 312 ℃, and the removal cost is very high. Therefore, the benzopyrene is trapped and removed in a liquid state of the benzopyrene, or when other organic matters with lower melting points exist, the solid benzopyrene is trapped by trapping other liquid organic matters.
When the temperature of the flue gas is 310-178 ℃, the benzopyrene is liquid fog drops. And adopting a grating adsorption trapping method to trap and remove. And a material which has small surface tension with liquid benzopyrene and is easy to wet is adopted as the grid material. A plurality of layers of grids are arranged in a special smoke channel, when smoke passes through the grids, liquid benzopyrene can collide with the grids, and the grid materials wetted with the benzopyrene can adsorb and capture the smoke. The flue gas can form the turbulent flow after striking with the grid, and the benzopyrene in the turbulent flow flue gas collides the polymerization each other, forms great droplet, and the turbulent flow flue gas enters into next group grid again simultaneously, and the flue gas strikes mutually with the grid once more, and the benzopyrene in the flue gas is adsorbed once more and is caught, catches through multichannel interception, can high-efficient desorption benzopyrene. The grid is arranged vertical to the ground, when the adsorbed benzopyrene is gathered to a certain amount, the adsorbed benzopyrene can automatically flow down along the grid under the action of gravity, a liquid collecting tank is arranged at the bottom of the grid, a discharge valve is arranged on the liquid collecting tank, and the collected benzopyrene can be discharged and collected regularly. If the temperature of the flue gas is lower than 190 ℃, a temperature rising measure can be adopted to raise the temperature of the flue gas to be higher than 190 ℃. The low-temperature benzopyrene has poor mobility, and the problem that the solid produced by cooling the trapping system to below the melting point of the benzopyrene cannot be trapped is avoided.
The smoke containing benzopyrene generally contains other organic matters, and if the organic matters are in a liquid state or a solid state, the organic matters can be captured and removed at the same time.
When the flue gas temperature is lower than the melting point of benzopyrene, if still other organic matters are liquid, the device can adsorb, bond and collect solid benzopyrene while collecting other liquid organic matters.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for trapping and removing benzopyrene in flue gas adopts a device for trapping and removing benzopyrene in flue gas, and the device comprises a shell 1, a flue gas inlet 2, a pressure equalizing plate 3, a trapping chamber 4, an upper cover plate 5, a flue gas outlet 6, a main guide groove 7, a moving-out section guide groove 8, a moving-in section guide groove 9, a moving-out section isostatic pressure chamber 10, a moving-in section isostatic pressure chamber 11, a moving-out section isostatic pressure chamber valve plate 12, a moving-in section isostatic pressure chamber valve plate 13, a liquid collecting tank 14, a liquid discharge port 15 and a trapping bundle 16.
The front end of the shell 1 is provided with a flue gas inlet 2, the flue gas inlet is connected with a collecting chamber 4, a pressure equalizing plate 3 is arranged between the flue gas inlet 2 and the collecting chamber 4 for distributing gas and equalizing pressure, the tail end of the shell 1 is provided with a flue gas outlet 6, the bottom of the shell 1 is provided with a liquid collecting tank 14 and a liquid discharging port 15, the upper part of the shell 1 is provided with an upper cover 5, and the collecting chamber 4 is arranged in the shell 1;
the trapping chamber 4 is composed of a trapping cluster 16 which is vertically distributed, a main guide groove 7 which is arranged at four corners, a moving-out section guide groove and a moving-in section guide groove 9, a limiting convex strip is arranged on a frame of the trapping cluster 16, or a spacing snap ring is additionally arranged, and the distance between the trapping cluster 16 is adjusted by adjusting the height of the convex strip or the thickness of the spacing snap ring; and pushing and pulling devices for catching the bunches 16 are arranged on the main guide groove 7, the moving-out section guide groove 8 and the moving-in section guide groove 9, so that the catching bunches 16 can slide directionally in the guide grooves.
The method specifically comprises the following steps:
(1) the flue gas enters a trapping chamber 4 after passing through a flue gas inlet 2 and a pressure equalizing plate 3 for gas distribution, and benzopyrene and other associated liquid solid organic matters in the flue gas are blocked, adsorbed or bonded and trapped by a trapping cluster 16; the smoke generates turbulent flow after being intercepted by each layer of trapping bundle, droplet-state benzopyrene or other organic matters can collide with each other and grow up, and are trapped when entering the next-stage trapping bundle, the probability that the trapped substances collide with the rear trapping bundle is increased due to the generated turbulent flow, and the organic matters are easy to be trapped; the liquid drops and a small amount of solid particles are adhered on the collecting cluster, and when a certain amount of liquid drops and a small amount of solid particles are accumulated, the liquid drops and the small amount of solid particles flow down along the collecting cluster under the action of gravity;
(2) the caught liquid organic matters flow downwards along the trapping tow line to enter a liquid collecting tank 14 and are periodically discharged through a liquid discharging port 15; when the liquid organic matters are adhered to the trapping bundle and cannot flow down due to high viscosity, a liquid collecting tank and a liquid discharging port are not arranged in the device, and trapping is completed by increasing the frequency of updating the trapping bundle;
(3) when the number of the collected bundles is large, the collected bundles are led out through the moving-out section guide groove, the collected bundles are taken out to be maintained and cleaned off line, and meanwhile, new collected bundles or cleaned collected bundles are led in through the moving-in section guide groove to supplement insufficient collected bundles in the collecting chamber.
In the device, the catching and bundling beam 16 consists of four frames and longitudinal fixing silk threads.
In the device, the silk thread material of the gathering beam 16 is the material which has small surface tension with the gathered object and enough strength, in particular to metal wire, cotton and hemp wire or chemical fiber wire, and the distance between the silk threads is more than 3 times of the diameter of the maximum intercepted fog drops and solid particles.
In the device, a moving-out section guide groove 8 is arranged at the front end of a main guide groove 7, the moving-out section guide groove 8 moves towards one side, and a catching bundle 16 is moved out of a shell 1 for off-line maintenance and cleaning; the tail end of the main guide groove 7 is provided with a shift-in section guide groove 9 for supplementing a new trapping beam 16, a shift-out isostatic pressure chamber 10 is arranged at the shift-out side of the shift-out section guide groove 7, a shift-in isostatic pressure chamber 11 is arranged at the shift-out side of the shift-in section guide groove 9, and smoke leakage or wild wind entering is avoided when the trapping beam 16 is shifted out or supplemented; the front and back isostatic pressing chambers and the smoke circulation trapping chamber are sealed and isolated by the sealing flashboards 12 and 13, so that the smoke leakage or wild wind entering of the system is avoided when the trapping cluster is replaced.
In the device, the collection bundle 16 is longitudinally and obliquely arranged in the collection chamber 4, the number of the collection bundle is a plurality, the distance between the collection bundle and the collection chamber is more than 3 times of the diameter of the maximum liquid drop and particle, and a certain included angle is formed between the collection bundle and the horizontal plane, the included angle is 30-150 degrees, so that the adsorption and capture substances can conveniently flow down along the collection bundle 16, and the collection bundle 16 is preferably arranged vertical to the horizontal plane.
And (3) when the device is intermittent working equipment, replacing the trapping cluster in a cover-opening and replacing mode so as to save a trapping cluster replacing system and reduce the equipment manufacturing cost.
The trapping and removing principle and the beneficial effects of the method are as follows:
according to the invention, a special material trapping bundle is selected and arranged in a trapping and removing chamber in a multi-layer manner, so that the flue gas generates turbulent flow impact when passing through the device, benzopyrene and organic matter liquid drops associated with the benzopyrene in the flue gas are adsorbed and captured when impacting with the special trapping bundle, and the adsorbed liquid drops flow into a liquid collecting tank at the bottom of the equipment under the action of gravity when being accumulated to a certain amount, and are discharged, recovered and treated in a centralized manner. Liquid drops carried in the flue gas generate impact turbulence when passing through each layer of trapping cluster, and the liquid drops, the liquid drops and solid particles are impacted and combined to grow. The density of the liquid drops is far greater than that of the gas, when the gas flow collides with the trapping beam, the kinetic energy of the liquid drops is large, the inertia is large, when the gas flow collides with the trapping beam, the liquid drops can break through the gas film and collide and contact with the intercepting and trapping beam, and because the material is specially selected, the surface of the adsorbing material and the adsorbed material have small surface tension, and when the adsorbed material collides and contacts with the trapping beam, the adsorbed material can be adsorbed and trapped by the surface of the trapping beam.
The flue gas flow is in a very thin layer when contacting with the trapping beam, only partial liquid drops can be trapped and captured each time, the liquid drops with large particle size are easy to be trapped and captured, and the liquid drops with small particle size are easy to escape, so that the liquid drops need to be trapped for many times by adjusting the structure form of the trapping beam. The larger the particle size, the larger the kinetic energy of the liquid drops is, when the air flow is blocked and the flow direction is changed, the liquid drops break through the air film due to inertia and impact with the interception and capture beams to be intercepted and captured. The larger the diameter, the stronger the ability of the droplets to break through the gas film, and the more readily they are adsorbed. On the contrary, the smaller the liquid drop is, the smaller the kinetic energy is, the poorer the capability of breaking through the gas film is, the less the liquid drop is easily adsorbed and captured; the trapping cluster has adsorption force on the adsorbed substance, the adsorbed substance also has desorption escape force due to inertia, and the larger the flue gas flow velocity is, the larger the inertia of the adsorbed substance is, and the larger the desorption escape force is. The adsorption force of the trapping bundle on the adsorbed substance is also related to the adsorption area of the adsorbing material and the particle size of the adsorbed substance. The larger the diameter of the adsorbing material is, the larger the adsorption area is, and the stronger the adsorption capacity is. However, the larger the diameter of the adsorbent, the smaller the specific adsorption surface area in a certain space, and the larger the size of the apparatus. The larger the particle size of the adsorbed substance is, the larger the desorption escape force is, and in order to effectively capture the substance, the larger the diameter of the adsorbing material is, and the lower the flow speed of the flue gas is. Otherwise, new droplets may be formed to escape, reducing the capture efficiency. Because the particle size of the benzopyrene liquid drops is smaller, the adsorption material can be thinner under the condition of allowing the intensity, the arrangement can be tighter, and the volume of the equipment can be smaller.
The flue gas flow velocity is fast, and system resistance is big, and the power consumption is big. The flue gas can form turbulent flow after passing through the trapping beam, the flue gas and the subsequent turbulent flow device can be subjected to disordered impact, liquid drops are intercepted again, the more times of interception, and the higher the liquid drop removal efficiency is.
The greater the density of threads on the trapping bundle, the greater the chance that a droplet will be intercepted and captured. The quotient of the sum of the efficiency of intercepting and capturing liquid drops and the surface area of the intercepting and capturing bundles divided by the flow cross section area of the airflow among the intercepting and capturing bundles is called the intercepting specific surface area, and the adsorption efficiency is positively correlated with the intercepting specific surface area and positively correlated with the intercepting times. In the case of the device of the present invention having a fixed geometry and a fixed resistance, the finer the capture bundle, the greater the number of capture bundles arranged in a certain space, the greater the sum of the capture bundle surface areas, the greater the chance of the captured substance colliding with the capture bundle, and the greater the probability of being captured.
The actual wind speed through the trapping and removing device depends on the diameter of the adsorbate particles, the diameter of the intercepting and adsorbing material and the adsorption force between the adsorbate and the intercepting and adsorbing material. When the specific working condition is related and the adsorption material is selected, related small tests are required to be performed, or the surface tension of the related material is checked for calculation, so that the proper flue gas flow rate is determined.
When the benzopyrene is trapped and removed in a liquid state, a primary dust remover is required to be arranged at the front end of the trapping, so that the dust concentration is reduced as much as possible, otherwise the removal effect of the benzopyrene is influenced, and the frequency of trapping and bundling replacement is increased.
If the smoke is accompanied by other liquid organic matters, the organic matters can be captured simultaneously; if the organic matter captured at the same time is highly viscous, the captured matter may adhere to the collection bundle, and the catch tank and the drain port may not be required. When the amount of the organic matters is large, the system resistance is increased, and the collection beam replacement frequency needs to be increased.
If the flue gas is accompanied by other low-melting-point organic matters besides the benzopyrene, when the flue gas is operated at a temperature above the melting point of the organic matters, the solid benzopyrene can be bonded and captured by the low-melting-point organic matters adsorbed on the trapping bundle even if the temperature of the flue gas is lower than the melting point of the benzopyrene. Thus, the trapping and removing of the solid benzopyrene can be realized. The flue gas can be prevented from being heated to achieve the energy-saving effect.
Drawings
FIG. 1 is a front view of an apparatus for trapping and removing benzopyrene in flue gas according to an embodiment of the present invention;
FIG. 2 is a top view of the device for trapping and removing benzopyrene in flue gas according to the embodiment of the invention;
FIG. 3 is a left side view of the device for trapping and removing benzopyrene in flue gas according to the embodiment of the invention;
FIG. 4 is a schematic diagram of a trapping bundle structure of the device for trapping and removing benzopyrene in flue gas according to the embodiment of the invention; wherein:
1-shell, 2-flue gas inlet, 3-pressure equalizing plate, 4-trapping chamber, 5-upper cover plate, 6-flue gas outlet, 7-main guide groove, 8-moving-out section guide groove, 9-moving-in section guide groove, 10-moving-out section isostatic pressure chamber, 11-moving-in section isostatic pressure chamber, 12-moving-out section isostatic pressure chamber valve plate, 13-moving-in section isostatic pressure chamber valve plate, 14-liquid collecting tank, 15-liquid discharging port and 16-trapping cluster.
Detailed Description
Example 1
In a certain carbon plant, the flue gas contains benzopyrene 15 mu g/m in the carbon production process3Local environmental protection departments require that the emission of the waste gas does not exceed 2.5 mu g/m3It is a serious standard exceeding. Since there is no mature technical treatment at present, the technique of this example was used for the experiment. The exhaust gas temperature is 205 ℃, and the dust is 30mg/m after cyclone dust removal350mg/m of tar3。
A device for trapping and removing benzopyrene in flue gas is shown in a front view, a top view and a left view in a drawing 3, and a trapping bundle structure is shown in a drawing 4, and comprises a shell 1, a flue gas inlet 2, a flue gas equalizing plate 3, a trapping chamber 4, an upper cover plate 5, a flue gas outlet 6, a main guide groove 7, a moving-out section guide groove 8, a moving-in section guide groove 9, a moving-out section isostatic pressure chamber 10, a moving-in section isostatic pressure chamber 11, a moving-out section isostatic pressure chamber valve plate 12, a moving-in section isostatic pressure chamber valve plate 13, a liquid collecting tank 14, a liquid discharging port 15 and a trapping and bundling 16.
The front end of the shell 1 is provided with a flue gas inlet 2, the flue gas inlet is connected with a collecting chamber 4, a pressure equalizing plate 3 is arranged between the flue gas inlet 2 and the collecting chamber 4 for distributing gas and equalizing pressure, the tail end of the shell 1 is provided with a flue gas outlet 6, the bottom of the shell 1 is provided with a liquid collecting tank 14 and a liquid discharging port 15, the upper part of the shell 1 is provided with an upper cover 5, and the collecting chamber 4 is arranged in the shell 1;
the trapping chamber 4 is composed of trapping bundles 16 which are vertically distributed, main guide grooves 7 which are arranged at four corners, a shifting-out section guide groove and a shifting-in section guide groove 9, a limiting clamp ring is arranged on a frame of the trapping bundles 16 to adjust the distance between the trapping bundles, the distance between the trapping bundles is set to be 20mm, and pushing devices of the trapping bundles 16 are arranged on the main guide grooves 7, the shifting-out section guide groove 8 and the shifting-in section guide groove 9 to enable the trapping bundles 16 to slide forwards in the guide grooves in a fixed mode;
the catching and bundling beam 16 is made of plain carbon steel wires;
a shift-out section guide groove 8 is arranged at the front end of the main guide groove 7, the shift-out section guide groove 8 moves to one side, and the catching bundle 16 is shifted out of the shell 1 for off-line maintenance and cleaning; the tail end of the main guide groove 7 is provided with a shift-in section guide groove 9 for supplementing a new trapping beam 16, a shift-out isostatic pressure chamber 10 is arranged at the shift-out side of the shift-out section guide groove 7, a shift-in isostatic pressure chamber 11 is arranged at the shift-out side of the shift-in section guide groove 9, and smoke leakage or wild wind entering is avoided when the trapping beam 16 is shifted out or supplemented; the front and back isostatic pressing chambers and the smoke circulation trapping chamber are sealed and isolated by the sealing flashboards 12 and 13, so that the smoke leakage or wild wind entering of the system is avoided when the trapping cluster is replaced.
The silk thread material of the collection bundle 16 in the collection chamber 4 is arranged vertical to the ground, so that the adsorbed and captured substances can flow down along the silk thread of the collection bundle 16 conveniently;
1. the flue gas enters a collecting chamber 4 after passing through a flue gas inlet 2 and being distributed by a pressure equalizing plate 3, and benzopyrene and associated tar in the flue gas are separated, adsorbed or bonded and collected by a collecting bundle 16; the smoke generates turbulent flow after being intercepted by each layer of trapping cluster, the droplet benzopyrene and tar can collide with each other and grow up, and the smoke is trapped when entering the next-level trapping cluster, the probability that the benzopyrene and the tar collide with the rear trapping cluster is increased due to the generated turbulent flow, and the styrene-acrylic and the tar are more easily trapped; the liquid drops and a small amount of solid particles are adhered on the collecting cluster, and when a certain amount of liquid drops and a small amount of solid particles are accumulated, the liquid drops and the small amount of solid particles flow down along the collecting cluster under the action of gravity;
2. the caught benzopyrene and tar flow downwards along the trapping strand wire to enter a liquid collecting tank 14 and are periodically discharged through a liquid discharging port 15;
3. when the number of the collected bundles is large, the collected bundles are led out through the moving-out section guide groove, the collected bundles are taken out to be maintained and cleaned off line, and meanwhile, new collected bundles or cleaned collected bundles are led in through the moving-in section guide groove to supplement insufficient collected bundles in the collecting chamber.
In the embodiment, 5000 cubic meters per hour is selected before a flue enters a chimney, the flue gas temperature is 207 ℃, the speed of a hollow tower in the device is designed to be 2 meters per second, the length of the device is designed to be 10 meters, the adsorption material is made of common carbon steel wires, the diameter of the adsorption material is 1.2 millimeters, the distance between the steel wires of the trapping bundles is 1.5 millimeters, and the distance between the trapping bundles is 20 millimeters. At the temperature, benzopyrene is in a liquid state, the liquid benzopyrene and the steel wire are well wetted, and the surface of the steel wire is not treated.
In the experimental process, due to the fact that the viscosity of tar is high, the trapped matters are bonded on the trapping bundles, and basically no tar is left in the liquid collecting tank. When large-scale engineering is carried out, whether a liquid collecting tank and a liquid discharge port are arranged can be determined according to the flowing temperature of the captured organic matters and the temperature of the flue gas.
After two months of operation, the trapping beam is changed once in two days on average, and the operation resistance is slightly increased. The benzopyrene in the treated smoke is less than 2.1 mu g/m3Tar of less than 5mg/m3Dust less than 5mg/m3. Meet local emission standards. Experiments show that the technical equipment has good effect of cooperatively treating tar and dust.
Example 2
Flue gas volume of 6000Nm of roasting production line of certain carbon plant3The exhaust temperature is 280 ℃, and the dust of the flue gas after primary dust removal treatment is 35mg/m3100mg/m of tar3Benzopyrene 17 μ g/m3. Both exceed the local environmental requirements. Therefore, the scheme is adopted for treatment.
A device for trapping and removing benzopyrene in flue gas is shown in a front view, a top view and a left view in a drawing 3, and a trapping bundle structure is shown in a drawing 4, and comprises a shell 1, a flue gas inlet 2, a flue gas equalizing plate 3, a trapping chamber 4, an upper cover plate 5, a flue gas outlet 6, a main guide groove 7, a moving-out section guide groove 8, a moving-in section guide groove 9, a moving-out section isostatic pressure chamber 10, a moving-in section isostatic pressure chamber 11, a moving-out section isostatic pressure chamber valve plate 12, a moving-in section isostatic pressure chamber valve plate 13, a liquid collecting tank 14, a liquid discharging port 15 and a trapping and bundling 16.
The front end of the shell 1 is provided with a flue gas inlet 2, the flue gas inlet is connected with a collecting chamber 4, a pressure equalizing plate 3 is arranged between the flue gas inlet 2 and the collecting chamber 4 for distributing gas and equalizing pressure, the tail end of the shell 1 is provided with a flue gas outlet 6, the bottom of the shell 1 is provided with a liquid collecting tank 14 and a liquid discharging port 15, the upper part of the shell 1 is provided with an upper cover 5, and the collecting chamber 4 is arranged in the shell 1;
the trapping chamber 4 is composed of trapping bundles 16 which are vertically distributed, main guide grooves 7 which are arranged at four corners, a shifting-out section guide groove and a shifting-in section guide groove 9, a limiting clamp ring is arranged on a frame of the trapping bundles 16 to adjust the distance between the trapping bundles, the distance between the trapping bundles is set to be 20mm, and pushing devices of the trapping bundles 16 are arranged on the main guide grooves 7, the shifting-out section guide groove 8 and the shifting-in section guide groove 9 to enable the trapping bundles 16 to slide forwards in the guide grooves in a fixed mode;
the catching and bundling beam 16 is made of plain carbon steel wires;
a shift-out section guide groove 8 is arranged at the front end of the main guide groove 7, the shift-out section guide groove 8 moves to one side, and the catching bundle 16 is shifted out of the shell 1 for off-line maintenance and cleaning; the tail end of the main guide groove 7 is provided with a shift-in section guide groove 9 for supplementing a new trapping beam 16, a shift-out isostatic pressure chamber 10 is arranged at the shift-out side of the shift-out section guide groove 7, a shift-in isostatic pressure chamber 11 is arranged at the shift-out side of the shift-in section guide groove 9, and smoke leakage or wild wind entering is avoided when the trapping beam 16 is shifted out or supplemented; the front and back isostatic pressing chambers and the smoke circulation trapping chamber are sealed and isolated by the sealing flashboards 12 and 13, so that the smoke leakage or wild wind entering of the system is avoided when the trapping cluster is replaced.
The silk thread material of the collection bundle 16 in the collection chamber 4 is arranged vertical to the ground, so that the adsorbed and captured substances can flow down along the silk thread of the collection bundle 16 conveniently;
the material of the trapping bundle 16 is ordinary carbon steel wire with small surface tension with the trapped object, and the diameter is selected to be 1.2 mm;
the length of the guide groove of the bundling turbulence device 2 is 15 meters, the bundling device is fully distributed in the guide groove, and the distance between the bundling devices is 20 millimeters. The distance between the steel wires on the collecting bundle is 2 cm, and the flow speed of the flue gas is 2 m/s.
The filaments of the collection bundle 16 are arranged perpendicular to the ground, so that the adsorbed capture substances can flow down along the filaments of the collection bundle 16.
The implementation steps are as follows:
(1) connecting the benzopyrene trapping and removing device with a flue gas pipeline, allowing the flue gas to enter a trapping chamber 4 after being distributed by a pressure equalizing plate 3 through a flue gas inlet 2, and adsorbing or binding and trapping the benzopyrene and tar in the flue gas through trapping and bundling; the flue gas generates turbulence after being intercepted by each layer of the trapping bundles 16, fog drops collide with each other and grow up, and are trapped when entering the next-level trapping bundle 16, the probability of collision between the flue gas and the rear trapping bundle 16 is increased due to the generated turbulence, and the flue gas is easy to be trapped;
(2) when the amount of the adhering matter of the collected bundle 16 is large, the system resistance increases, and when the system resistance reaches a limit value, the collected bundle 16 is led out through the disengagement section guide groove 8, the collected bundle 16 which is taken out is maintained and cleaned off-line, and a new collected bundle 16 or the cleaned collected bundle 16 is led in through the supplement section guide groove 9, so that the insufficient collected bundle 16 in the collecting chamber 4 is supplemented.
(3) The off-line cleaning adopts a closed electric heating furnace.
After 7 months of operation, all the devices were normal. Due to the high temperature of the smoke, tar can flow out, the tar is discharged once a day, and benzopyrene is mixed in the tar. The trapping and bundling are changed once a week on average, and the running resistance is slightly increased. The benzopyrene in the treated smoke is less than 2.0 mu g/m3Tar of less than 5mg/m3Dust less than 4mg/m3. Meet local emission standards.
Experiments show that the technical equipment has good effect of cooperatively treating tar and dust.
Example 3
The maximum smoke quantity of the smoked chicken production line of a certain food processing factory is 500Nm3The exhaust temperature is 165 ℃, and the benzopyrene in the exhaust reaches 15 mu g/m3Simultaneously contains liquid oil drops of 40mg/m3Carbon black dust 20mg/m3Both exceeding local emission standards. The equipment is adopted for treatment.
A device for trapping and removing benzopyrene in smoke is shown in the front view of FIG. 1, the top view of FIG. 2, the left view of FIG. 3, the structure diagram of trapping bundle of FIG. 4, and the structure comprises: the device comprises a shell 1, a collecting chamber 2, a flue gas inlet 3, a flue gas outlet 4, a pressure equalizing plate 6, an upper cover plate 7, a liquid collecting tank 8, a liquid outlet 9 and a smoke exhaust chimney 10; the trapping chamber is filled with the trapping bundle 11; the catching and bundling material is ordinary carbon steel wire with the diameter of 1.0 mm. The distance between the steel wires was 1.5 mm, and the distance between the bundles was 15 mm. The effective length of the cluster-capturing turbulent flow device is 10 meters. The flue gas flow rate was set at 1.5 m/s.
Because the melting point of the oil mist in the flue gas is lower, the surface of the steel wire of the trapping bundle is fully adhered with a liquid oil film after the oil mist is trapped by the trapping bundle, the wettability of the oil film and solid benzopyrene is good, and the oil film can adsorb and trap the solid benzopyrene and carbon black dust. The liquid oil has good fluidity at 165 ℃, and can flow down by gravity when being gathered to a certain amount.
Because the production line is intermittent type formula production, when equipment needs clearance maintenance, can open the upper cover plate and get out the clearance change with the entrapment bundle.
The equipment was operated for 1 year all the way to normal, and the trapping beam did not need to be replaced.
The benzopyrene in the smoke after the smoke treatment is less than 2.0 mu g/m3The oil mist is less than 5mg/m3Dust less than 3mg/m3. Meet local emission standards.
Through the treatment of the device, if low-melting-point organic matters exist in the flue gas, the solid benzopyrene can be removed synergistically.
Claims (6)
1. A method for trapping and removing benzopyrene in flue gas is characterized in that a device for trapping and removing benzopyrene in flue gas is adopted, the device comprises a shell, a flue gas inlet, a pressure equalizing plate, a trapping chamber, an upper cover plate, a flue gas outlet, a main guide groove, a moving-out section guide groove, a moving-in section guide groove, a moving-out section isostatic pressure chamber, a moving-in section isostatic pressure chamber, a moving-out section isostatic pressure chamber valve plate, a moving-in section isostatic pressure chamber valve plate, a liquid collecting groove, a liquid discharge port and a trapping cluster, wherein:
the front end of the shell is provided with a smoke inlet, the smoke inlet is connected with the collecting chamber, a pressure equalizing plate is arranged between the smoke inlet and the collecting chamber for distributing and equalizing air, the tail end of the shell is provided with a smoke outlet, the bottom of the shell is provided with a liquid collecting tank and a liquid discharging port, the upper part of the shell is provided with an upper cover, and the collecting chamber is arranged in the shell;
the trapping chamber is composed of a trapping bundle which is vertically distributed, main guide grooves which are arranged at four corners, a shifting-out section guide groove and a shifting-in section guide groove, limiting convex strips are arranged on the trapping bundle frame, or interval snap rings are additionally arranged, and the interval between the trapping bundles is adjusted by adjusting the height of the convex strips or the thickness of the interval snap rings; the main guide groove, the shift-out section guide groove and the shift-in section guide groove are provided with a push and pull device for catching the cluster, so that the catching cluster can directionally slide in the guide grooves;
the method specifically comprises the following steps:
(1) the flue gas enters a trapping chamber after being distributed through a flue gas inlet and a pressure equalizing plate, and benzopyrene and other associated liquid solid organic matters in the flue gas are trapped by blocking adsorption or bonding of a trapping beam; the smoke generates turbulent flow after being intercepted by each layer of trapping bundle, droplet-state benzopyrene or other organic matters can collide with each other and grow up, and are trapped when entering the next-stage trapping bundle, the probability that the trapped substances collide with the rear trapping bundle is increased due to the generated turbulent flow, and the organic matters are easy to be trapped; the liquid drops and a small amount of solid particles are adhered on the collecting cluster, and when a certain amount of liquid drops and a small amount of solid particles are accumulated, the liquid drops and the small amount of solid particles flow down along the collecting cluster under the action of gravity;
(2) the caught liquid organic matters flow downwards along the trapping tow line to enter a liquid collecting tank and are periodically discharged through a liquid outlet; when the liquid organic matters are adhered to the trapping bundle and cannot flow down due to high viscosity, a liquid collecting tank and a liquid discharging port are not arranged in the device, and trapping is completed by increasing the frequency of updating the trapping bundle;
(3) when the number of the collected bundles is large, the collected bundles are led out through the moving-out section guide groove, the collected bundles are taken out to be maintained and cleaned off line, and meanwhile, new collected bundles or cleaned collected bundles are led in through the moving-in section guide groove to supplement insufficient collected bundles in the collecting chamber.
2. The method for trapping and removing benzopyrene in flue gas according to claim 1, wherein the trapping bundle consists of four frames and longitudinal fixing wires.
3. The method for trapping and removing benzopyrene in flue gas according to claim 2, wherein the thread is made of metal wire, cotton hemp or chemical fiber, and the distance between threads is more than 3 times of the maximum intercepted fog drops and the diameter of solid particles.
4. The method for trapping and removing benzopyrene in flue gas according to claim 1, wherein a removal section guide groove is arranged at the front end of the main guide groove, the removal section guide groove moves to one side, and the trapping beam is removed from the shell for off-line maintenance and cleaning; the tail end of the main guide groove is provided with a moving-in section guide groove for supplementing a new trapping bundle, a moving-out isostatic pressure chamber is arranged at the moving-out side of the moving-out section guide groove, a moving-in isostatic pressure chamber is arranged at the moving-in side of the moving-in section guide groove, and smoke gas leakage or air inlet is avoided when the trapping bundle is moved out or supplemented; the front and back isostatic pressing chambers and the smoke circulation trapping chamber are isolated by a sealing flashboard and a plug, so that the smoke leakage or air intake of the system is avoided when the trapping cluster is replaced.
5. The method for trapping and removing benzopyrene in flue gas according to claim 1, wherein the trapping beams are longitudinally arranged in the trapping chamber, the number of the trapping beams is a plurality, the distance between the trapping beams is more than 3 times of the diameter of the maximum liquid drop and the particle, and an included angle is formed between the trapping beams and the horizontal plane, and the included angle is 30-150 degrees.
6. The method for trapping and removing benzopyrene in flue gas according to claim 5, wherein the included angle between the trapping cluster and the horizontal plane is 90 degrees.
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| CN86105168A (en) * | 1986-08-15 | 1987-02-11 | 沈阳环境科学研究所 | Wet impact screen dusting and desulphating machine |
| JP4444386B2 (en) * | 1999-03-17 | 2010-03-31 | ダイダン株式会社 | Powder recovery filter and powder recovery filter unit |
| JP5290492B2 (en) * | 2005-07-19 | 2013-09-18 | 昭和電機株式会社 | Oil mist removal device |
| CN203355481U (en) * | 2013-05-21 | 2013-12-25 | 武汉宏朗石化设备制造有限公司 | Novel drawer type wire mesh demister |
| US20140360371A1 (en) * | 2013-06-11 | 2014-12-11 | Michael W. Seitz | Portable Dust Collector |
| CN104368215B (en) * | 2014-08-28 | 2016-12-07 | 北京清新环境技术股份有限公司 | A kind of degree of depth takes off dirt demister |
| CN105268584B (en) * | 2015-11-09 | 2019-05-24 | 嘉兴启净涂装科技有限公司 | A kind of deflector type coating cloud capturing device |
| CN207591447U (en) * | 2017-11-24 | 2018-07-10 | 内蒙古伊泰化工有限责任公司 | Wire mesh demister |
| CN108815979B (en) * | 2018-07-09 | 2022-05-13 | 钢研晟华科技股份有限公司 | Material conveying method of removing tower |
| CN109157942B (en) * | 2018-07-09 | 2022-05-13 | 钢研晟华科技股份有限公司 | Material conveying device of removing tower |
| CN211536880U (en) * | 2019-12-27 | 2020-09-22 | 江苏通达环保工程有限公司 | Drawer type silk screen demister |
| CN111905520A (en) * | 2020-08-26 | 2020-11-10 | 沈阳东大山汇环境科技有限公司 | Treatment equipment and method for polymorphic organic composite pollutants |
| CN212396299U (en) * | 2020-08-26 | 2021-01-26 | 沈阳东大山汇环境科技有限公司 | Treatment equipment for polymorphic organic composite pollutants |
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