CN112473327A - Dry tail gas processing system of artificial fiber board - Google Patents
Dry tail gas processing system of artificial fiber board Download PDFInfo
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- CN112473327A CN112473327A CN202011600871.9A CN202011600871A CN112473327A CN 112473327 A CN112473327 A CN 112473327A CN 202011600871 A CN202011600871 A CN 202011600871A CN 112473327 A CN112473327 A CN 112473327A
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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
- B01D53/14—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 absorption
- B01D53/1425—Regeneration of liquid absorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
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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
- B01D53/14—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 absorption
- B01D53/1487—Removing organic compounds
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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
- B01D53/14—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 absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
- B01D53/185—Liquid distributors
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- B01D2257/704—Solvents not covered by groups B01D2257/702 - B01D2257/7027
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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
- B01D2257/708—Volatile organic compounds V.O.C.'s
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
Abstract
A dry tail gas treatment system for artificial fiberboard comprises an absorption tower and a tail gas inlet pipe connected with the absorption tower, wherein a plurality of layers of washing nozzles are arranged in the absorption tower, a liquid outlet of the absorption tower is arranged at the bottom of the absorption tower and connected with an inlet of a circulating pump of the absorption tower, and an outlet of the circulating pump of the absorption tower is connected with a recovery pipeline; the washing water treatment system comprises a formaldehyde removal reactor connected with an external discharge regulating valve, a water outlet pipe of the formaldehyde removal reactor is connected with a filter, a screen is arranged in the filter and is connected with a clean water tank and a residue liquid tank, and a clean water pump is arranged in the clean water tank and is connected with a circulating pipeline of the absorption tower. The invention can remove the particulate matters, formaldehyde and other VOC pollutants in the dry tail gas of the artificial fiberboard at one time, and the formaldehyde and suspended matters in the washing absorption liquid are always kept at a low level through the uninterrupted circulating treatment of the washing absorption liquid, thereby ensuring the removal efficiency of dust and formaldehyde in the dry tail gas of the artificial fiberboard in the spraying process of the absorption tower.
Description
Technical Field
The invention belongs to the technical field of environmental protection, relates to a tail gas treatment method, and particularly relates to a drying tail gas treatment system for an artificial fiberboard.
Background
In the production process of the artificial fiberboard, the glued fiber needs to be dried by a hot air pipeline and a drying tower, and the dried tail gas is discharged out of the system after cyclone separation. Because can have some tiny fibre, boiler flue gas dust and volatile free formaldehyde to retrieve through cyclone in the drying process, consequently, can contain particulate matter and formaldehyde in the dry tail gas of emission, must remove dust and remove formaldehyde to tail gas and handle, can accomplish emission up to standard.
The tail gas discharged from the drying section has large smoke quantity, low temperature and large humidity, contains organic gas pollutants such as VOC (volatile organic compounds) such as urea-formaldehyde glue, formaldehyde and the like, and is not suitable for directly using a cloth bag, a filter cylinder and other filtering type dust removal and electric dust removal processes.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention discloses a system for treating the dry tail gas of an artificial fiberboard.
The artificial fiberboard drying tail gas treatment system comprises an absorption tower and a tail gas inlet pipe connected with the absorption tower, wherein a spraying and washing nozzle is arranged in the gas inlet pipe, a plurality of layers of washing nozzles are arranged in the absorption tower, a washing water outlet of the absorption tower is arranged at the bottom of the absorption tower and connected with an inlet of a circulating pump of the absorption tower, an outlet of the circulating pump of the absorption tower is connected with a circulating pipeline, and the circulating pipeline is connected with a washing water circulating system through an external discharge regulating valve;
the washing water circulating system comprises a formaldehyde removing reactor connected with an external discharge regulating valve, a water outlet pipe of the formaldehyde removing reactor is connected with a filter, a filter screen is arranged in the filter and is connected with a clean water tank and a residue liquid tank, a clean water pump is arranged in the clean water tank and is connected with a circulating channel of the absorption tower,
the treatment system also comprises a controller which is in signal connection with the absorption tower circulating pump, the outward discharge regulating valve and the clean water pump.
Preferably, remove the formaldehyde reactor include with arrange the governing valve be connected remove the formaldehyde reactor feed liquor pipe and with remove the reaction tank of formaldehyde reactor feed liquor union coupling, remove the formaldehyde reactor feed liquor pipe and stretch into the reaction tank bottom, the reaction tank is provided with agitator and charging means, the reaction tank lateral wall top advances water piping connection sedimentation tank through the center, the export of center inlet tube is located sedimentation tank middle part below, the sedimentation tank bottom is provided with the mud pipe, and sedimentation tank top lateral wall is provided with the outlet pipe.
Furthermore, a right-angle water outlet weir is arranged outside the water outlet pipe, the bottom plate of the water outlet weir is lower than the bottom of the water outlet pipe, and the side plate of the water outlet weir is vertical to the bottom plate of the water outlet weir and is higher than the top of the water outlet pipe.
Furthermore, the feeder is a lime feeder, a pH value meter is arranged at the bottom of the reaction tank, and the lime feeder and the pH value meter are in signal connection with the controller.
Preferably, the filter includes with remove formaldehyde reactor outlet pipe connection's water distributor to and encircle the cylindrical lauter tub of water distributor, the lauter tub lateral wall does the filter screen, the lauter tub other end are provided with the pipe of slagging tap, the lauter tub top is provided with filter screen washing unit, the filter still includes the drive lauter tub rotate and with controller signal connection's drive arrangement.
Furthermore, the water distribution pipe penetrates through the circle center of an end panel at one end of the filter barrel and is fixedly connected with the end panel, a plurality of water distribution holes are formed in the part, located in the filter barrel, of the water distribution pipe, and the water distribution pipe is in driving connection with the driving device.
Preferably, an air inlet pipe washing nozzle is arranged in the air inlet pipe of the absorption tower and is connected with the circulating pipeline.
Preferably, the slag liquid pool is also connected with a filter press, and filter residues pressed out by the filter press are transported to a boiler for incineration treatment by a forklift.
Preferably, the treatment system further comprises a fresh water replenishing device, wherein the fresh water replenishing device comprises a cleaning nozzle which is arranged at the top of the absorption tower and is higher than the demister, and a fresh water tank which is connected with the cleaning nozzle;
the new water pool is provided with a liquid level meter and a supplementary pump which are in signal connection with the controller.
Further, the filter is provided with a filter screen flushing device, and the filter screen flushing device is connected with the supplementary pump.
Compared with the prior art, the invention has the following advantages:
the invention can remove the particulate matters, formaldehyde and other VOC pollutants in the dry tail gas of the artificial fiberboard at one time, and provides a solution for the standard emission of the dry tail gas of the artificial fiberboard.
Through the uninterrupted circulating treatment of the washing absorption liquid, the formaldehyde and suspended matters in the washing absorption liquid are always maintained at a low level, and the removal efficiency of dust and formaldehyde in the dry tail gas of the artificial fiber board in the spraying process of the absorption tower is ensured.
Thirdly, the washing absorption liquid can be recycled, and the purposes of saving water and avoiding secondary pollution are achieved.
Drawings
FIG. 1 is a schematic diagram of one embodiment of a dry tail gas treatment system for artificial fiberboard according to the present invention;
FIG. 2 is a schematic view of one embodiment of the formaldehyde reactor of the present invention;
FIG. 3 is a schematic view of one embodiment of the filter according to the present invention;
the reference numbers in the figures refer to: 1-artificial board drying tail gas, 2-absorption tower air inlet pipe, 3-air inlet pipe washing nozzle, 4-absorption tower, 5-demister washing nozzle, 6-demister, 7-multilayer washing nozzle, 8-absorption tower exhaust port, 9-absorption tower circulating pump, 10-external discharge regulating valve, 11-formaldehyde removal reactor, 12-filter, 13-clear water tank, 14-slag liquid tank, 15-filter press, 16-new water tank, 17-tap water pipe, 18-supplementary pump, 20-reactor liquid inlet pipe, 21-reaction tank, 22-stirrer, 23-feeder, 24-central water inlet pipe, 25-sedimentation tank, 26-water outlet weir, 27-mud discharge pipe, 30-water distribution pipe and 31-filter screen, 32-screen flushing device, 33-slag pipe.
Detailed Description
The following provides a more detailed description of the present invention.
The invention aims at treating tail gas generated in the production process of artificial board glue making, and dry tail gas generated in the production process of artificial boards contains fine fibers, boiler flue gas dust and volatile free formaldehyde and cannot be directly discharged.
The artificial fiberboard drying tail gas treatment system comprises an absorption tower 4 and a tail gas inlet pipe 2 connected with the absorption tower, wherein an inlet pipe washing nozzle 3 is arranged in the inlet pipe of the absorption tower, a plurality of layers of washing nozzles are arranged in the absorption tower 4, a liquid outlet of the absorption tower is arranged at the bottom of the absorption tower 4 and is connected with an inlet of an absorption tower circulating pump 9, an outlet of the absorption tower circulating pump 9 is connected with a circulating pipeline, and the circulating pipeline is connected with a washing water treatment system through an external discharge regulating valve 10;
the washing water treatment system comprises a formaldehyde removal reactor 11 connected with an external discharge regulating valve, a water outlet pipe of the formaldehyde removal reactor is connected with a filter 12, a filter screen is arranged in the filter and is connected with a clean water tank 13 and a slag liquid tank 14, a clean water pump is arranged in the clean water tank and is connected with a pipeline at the bottom of the absorption tower,
the treatment system also comprises a controller which is in signal connection with the absorption tower circulating pump 9, the external discharge regulating valve 10 and the clean water pump. The controller may also be used for control and signal acquisition of other devices in particular embodiments.
The controller can be realized by a singlechip, a DSP and the like.
Dry tail gas 1 of wood-based plate gets into absorption tower 4 through absorption tower intake pipe 2, the setting of absorption tower air inlet is in absorption tower middle part position under the right side, the absorption tower advances to be provided with washing nozzle 3 in the pipeline, the upper is provided with the multilayer washing nozzle in the absorption tower, through downwards spraying absorption most formaldehyde to make the particulate matter wherein mostly subsides in the absorption tower bottom by the shower water absorption, the multilayer nozzle can be in vertical projection direction dislocation distribution, reduces gas short circuit and reaction blind spot.
After most of formaldehyde and particulate matters are removed by spraying the tail gas from bottom to top, the tail gas is discharged from an absorption tower exhaust port 8 at the top of the absorption tower, and the actual measurement data shows that when the concentration of the particulate matters in the inlet tail gas is 130mg/Nm3 and the concentration of the formaldehyde is 25mg/Nm3, the concentration of the particulate matters in the exhaust tail gas discharged from the absorption tower exhaust port 8 is less than or equal to 10mg/Nm3, the concentration of the formaldehyde is less than or equal to 5mg/Nm3, the particulate matter removal rate of the actual dry tail gas is greater.
After the sprayed washing absorption liquid is circulated for a plurality of times for a long time, the concentrations of particles and formaldehyde in the water are increased continuously, if the washing absorption liquid is used continuously, the formaldehyde absorption effect is deteriorated, and the treatment system of the circulating washing absorption liquid is arranged for purifying the washing absorption liquid used by the absorption tower.
The bottom of the absorption tower 4 can be provided with a formaldehyde concentration sensor and a density sensor, and when the formaldehyde concentration or the solution density of the absorption liquid deposited at the bottom is detected to exceed a set threshold value, a treatment system is started to treat the absorption liquid.
An absorption tower circulating pump connected with the bottom of the absorption tower pumps absorption liquid to a formaldehyde removal reactor to treat formaldehyde in the absorption liquid, a connecting pipeline between the absorption tower circulating pump and the formaldehyde removal reactor can be connected with an absorption liquid discharge regulating valve 10, an electromagnetic valve is selected to facilitate automatic control, and the flow of the absorption liquid fed into the formaldehyde removal reactor is controlled; calculation and application prove that 10 percent of the circulating absorption liquid is sent to a treatment system for purification treatment, and the process requirements can be met.
The formaldehyde removal reactor 11 is used for removing formaldehyde in the absorption liquid, and a specific embodiment of the formaldehyde removal reactor is shown in fig. 2. Remove formaldehyde reactor 11 and include the reactor feed liquor pipe be connected with outer row governing valve 10 and with reactor feed liquor union coupling's reaction tank 21, reaction tank 21 is provided with agitator 22 and charging means 23, the central intake union coupling sedimentation tank 25 is advanced through central water piping in reaction tank lateral wall top, the export of central intake pipe 24 is located sedimentation tank 25 middle part below, the sedimentation tank bottom is provided with mud pipe 27, and sedimentation tank top lateral wall is provided with the outlet pipe.
The absorption liquid enters the reaction tank through the liquid inlet pipe of the reactor, the material such as lime for removing formaldehyde is put into the reaction tank by the feeder, the reaction is accelerated by the stirring of the stirrer, the liquid after the reaction enters the sedimentation tank from the central water inlet pipe and is precipitated in the sedimentation tank, and the precipitated clear water is discharged through the water outlet pipe above the sedimentation tank.
The lime feeding amount of the reaction tank is adjusted and controlled by the reading of the pH value meter, so that the pH value can reach more than 9, the pH value meter is arranged at the bottom of the reaction tank, the lime feeding device and the pH value meter are in signal connection with the controller, and the controller automatically adds lime through detection to control the pH value of the reaction. Tests show that the formaldehyde reactor provided by the invention is used for removing formaldehyde in water by more than or equal to 80%.
In the embodiment shown in fig. 2, a right-angled effluent weir 26 is arranged outside the outlet pipe, the bottom plate of the effluent weir is lower than the bottom of the outlet pipe, and the side plate of the effluent weir is perpendicular to the bottom plate of the effluent weir and is higher than the top of the outlet pipe. The design of the water outlet weir can prevent liquid mixed with solid precipitates from entering the water outlet pipe to block the water outlet pipe.
In one specific embodiment, the formaldehyde removal reactor is tested, the concentration of suspended matters in absorption liquid sent into the formaldehyde removal reactor is set to be more than or equal to 3000mg/L, when the concentration of formaldehyde is more than or equal to 500mg/L, 10% of the absorption liquid in the absorption tower is sent to the bottom of a reaction tank of the formaldehyde removal reactor through a circulation pump 9 of the absorption tower and an external absorption liquid discharge adjusting valve 10, the liquid after reaction enters a central water inlet pipe of the sedimentation tank through an internal pipeline, and the water after sedimentation is discharged through a water outlet weir at the periphery of the sedimentation tank. The lime adding amount of the reaction tank is regulated and controlled by a pH value meter, and the removal rate of formaldehyde in water is more than or equal to 80 percent.
Get rid of the absorption liquid of most formaldehyde and send into subsequent filter 12 and get rid of the particulate matter in the absorption liquid, give a specific embodiment of filter as shown in fig. 3, the filter include with remove formaldehyde reactor outlet pipe connection's water distributor 30 to and encircle the cylindrical lauter tub of water distributor 30, the lauter tub lateral wall does filter screen 31, the lauter tub other end are provided with slag outlet pipe 33, the lauter tub top is provided with filter screen washing unit, the filter still includes the drive lauter tub and rotates and with controller signal connection's drive arrangement, the clean water basin sets up in the lauter tub below.
During specific use, the driving device can be stopped intermittently, filter materials blocked by the filter screen and the slag discharging pipe are loaded and naturally and simultaneously lowered to the lowest position under the action of gravity, and solid particles can be poured out from the slag discharging pipe at the moment.
The absorption liquid enters the filter vat from the water distribution pipe, the filter vat is driven by the driving device to rotate, the rotation speed is slow so as to avoid the liquid splashing, the side wall of the filter vat is provided with a filter screen, the absorption liquid is filtered by the filter screen, and the filtered absorption liquid penetrating through the filter screen flows into a clean water tank below under the action of gravity.
Wherein the water distributor can pass the end panel centre of a circle of lauter tub one end and with end panel fixed connection, a plurality of water distribution holes have been seted up to the water distributor position in the lauter tub inside part, the water distributor still with drive arrangement drive connection, drive arrangement direct drive water distributor drive lauter tub rotation, and the absorption liquid is evenly sprayed on the circumference lateral wall of lauter tub along with rotating in the water distributor, increase filter screen usable floor area.
In one embodiment, the designed filter screen is 180 meshes, and the suspended substances with the content of more than or equal to 85% in the effluent of the integrated formaldehyde removal reactor 11 can be removed through actual measurement.
The filter 12 is arranged on a clean water tank 13, the filtered clean water directly flows into the clean water tank 13 under the action of gravity, the clean water tank 13 is used as a storage tank of the filtered clean water, and a liquid level meter arranged in the tank controls and starts a water pump to pump the clean water back to the absorption tower 4 for recycling according to the liquid level of the clean water in the tank.
A slag liquid pool 14 is built below the slag outlet of the filter 12, and filter residue in the slag liquid pool 14 is pumped to a filter press 15 through a slag liquid for dehydration treatment; and (4) sending the filter residue after dehydration to a biomass boiler for incineration treatment, wherein the water content of the filter residue after dehydration is less than 75%. The filter residue discharged from the deposition port at the bottom of the formaldehyde reactor can also be sent into a residue liquid pool for treatment.
In the operation of the absorption tower 4, the circulating washing absorption liquid needs to be continuously supplemented with new water because of the reduction of evaporation, filter residue carrying-out and the like, and the new water is provided by a new water pool 16. The new water tank 16 is connected with a tap water pipe 17 for supplying water to a system, a level meter and a water inlet valve of the new water tank 16 are used for controlling the water inflow of tap water, a cleaning pump 18 is arranged at the bottom of the new water tank 16 and is used for sending new water to the absorption tower 4 for cleaning the demister 6 according to the command of a demister 6 cleaning program control system of the absorption tower 4, the new water tank is connected with a cleaning nozzle 5 at the top of the absorption tower and is used for spraying water downwards to clean the demister 6, and the cleaned water enters the absorption tower 4 to be used as make-up water for circulating the washing absorption liquid. As shown in figure 1, the top of the filter also can be provided with a filter screen flushing device 33, and the filter screen cleaning device 33 is connected with the supplementary pump 14 to clean the filter vat through the nozzle of the cleaning device.
The measured data show that the concentration of the particulate matters in the inlet tail gas is 130mg/Nm3The formaldehyde concentration is 25mg/Nm3When the method is adopted for treatment, the concentration of discharged tail gas particulate matters at the exhaust port 8 of the absorption tower is less than or equal to 10mg/Nm3The concentration of formaldehyde is less than or equal to 5mg/Nm3The removal rate of the particulate matters of the actual drying tail gas is more than or equal to 93 percent, and the removal rate of the formaldehyde is more than or equal to 80 percent.
Compared with the prior art, the invention has the following advantages:
the invention can remove the particulate matters, formaldehyde and other VOC pollutants in the dry tail gas of the artificial fiberboard at one time, and provides a solution for the standard emission of the dry tail gas of the artificial fiberboard.
Through the uninterrupted circulating treatment of the washing absorption liquid, the formaldehyde and suspended matters in the washing absorption liquid are always maintained at a low level, and the removal efficiency of dust and formaldehyde in the dry tail gas of the artificial fiber board in the spraying process of the absorption tower is ensured.
Thirdly, the washing absorption liquid can be recycled, and the purposes of saving water and avoiding secondary pollution are achieved.
The foregoing is directed to preferred embodiments of the present invention, wherein the preferred embodiments are not obviously contradictory or subject to any particular embodiment, and any combination of the preferred embodiments may be combined in any overlapping manner, and the specific parameters in the embodiments and examples are only for the purpose of clearly illustrating the inventor's invention verification process and are not intended to limit the scope of the invention, which is defined by the claims and the equivalent structural changes made by the description and drawings of the present invention are also intended to be included in the scope of the present invention.
Claims (10)
1. The artificial fiberboard drying tail gas treatment system is characterized by comprising an absorption tower (4) and a tail gas inlet pipe (2) connected with the absorption tower, wherein a washing nozzle (3) is arranged in an air inlet pipeline of the absorption tower, a plurality of layers of washing nozzles (7) are arranged in the absorption tower (4), a liquid outlet of the absorption tower is arranged at the bottom of the absorption tower and is connected with an inlet of an absorption tower circulating pump (9), a liquid outlet of the absorption tower circulating pump (9) is connected with a circulating pipeline, and the circulating pipeline is connected with a washing water treatment system through an external discharge regulating valve (10);
the washing water treatment system comprises a formaldehyde removal reactor (11) connected with an external discharge regulating valve (10), a water outlet pipe of the formaldehyde removal reactor is connected with a filter (12), a filter screen (31) is arranged in the filter and is connected with a clean water tank (13) and a slag liquid tank (14), a clean water pump is arranged in the clean water tank (13) and is connected with a recovery pipeline of the absorption tower,
the treatment system also comprises a controller which is in signal connection with the absorption tower circulating pump (9), the external discharge regulating valve (10) and the clean water pump.
2. The dry tail gas treatment system for artificial fiberboard according to claim 1, wherein the formaldehyde removal reactor (11) comprises a reactor liquid inlet pipe connected with the external discharge regulating valve (10) and a reaction tank (21) connected with the reactor liquid inlet pipe, the reactor liquid inlet pipe (20) extends into the bottom of the reaction tank (21), the reaction tank (21) is provided with a stirrer (22) and a feeder (23), the top of the side wall of the reaction tank is connected with the sedimentation tank (25) through a central water inlet pipe, the outlet of the central water inlet pipe is positioned below the middle part of the sedimentation tank (25), the bottom of the sedimentation tank is provided with a sludge discharge pipe (27), and the side wall above the sedimentation tank is provided with the water outlet pipe.
3. The dry tail gas treatment system for artificial fiber boards according to claim 2, wherein a right-angled effluent weir (26) is arranged outside the effluent pipe, the bottom plate of the effluent weir is lower than the bottom of the effluent pipe, and the side plate of the effluent weir is vertical to the bottom plate of the effluent weir and is higher than the top of the effluent pipe.
4. The dry tail gas treatment system for artificial fiberboard of claim 2, wherein the feeder is a lime feeder, a pH value meter is arranged at the bottom of the reaction tank, and the lime feeder and the pH value meter are in signal connection with the controller.
5. The dry tail gas treatment system for artificial fiberboard of claim 1, wherein the filter comprises a water distribution pipe (30) connected with a water outlet pipe of the formaldehyde removal reactor, and a cylindrical filter vat surrounding the water distribution pipe (30), the filter vat has a side wall with the filter screen (31), the other end of the filter vat is provided with a slag outlet pipe (33), the top of the filter vat is provided with a filter screen flushing device (32), and the filter further comprises a driving device for driving the filter vat to rotate and connected with a signal of the controller.
6. The dry tail gas treatment system for artificial fiber boards as claimed in claim 5, wherein the water distribution pipe (30) passes through the center of the end panel at one end of the filter vat and is fixedly connected with the end panel, the water distribution pipe is provided with a plurality of water distribution holes at the inner part of the filter vat, and the water distribution pipe (30) is also in driving connection with the driving device.
7. The dry tail gas treatment system for artificial fiberboard of claim 1, wherein an inlet pipe washing nozzle (3) is arranged in the inlet pipe of the absorption tower, and the inlet pipe washing nozzle is connected with the circulating pipeline.
8. The dry tail gas treatment system for artificial fiberboard according to claim 1, wherein the slag liquid pool is further connected with a filter press (15), and filter-pressing residues discharged from the filter press (15) are sent to a boiler for incineration treatment by a forklift.
9. The dry tail gas treatment system for artificial fiberboard of claim 1, further comprising a fresh water replenishing device comprising a washing nozzle disposed at the top of the absorption tower higher than the demister and a fresh water tank (16) connected to the washing nozzle;
the new water pool is provided with a liquid level meter and a supplementary pump (18), and the liquid level meter and the supplementary pump (18) are in signal connection with the controller.
10. Fibreboard drying off-gas treatment system according to claim 9, characterized in that the filter (12) is provided with a screen washing device (33), the screen washing device (33) being connected to the supplementary pump (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011600871.9A CN112473327A (en) | 2020-12-30 | 2020-12-30 | Dry tail gas processing system of artificial fiber board |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011600871.9A CN112473327A (en) | 2020-12-30 | 2020-12-30 | Dry tail gas processing system of artificial fiber board |
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| CN112473327A true CN112473327A (en) | 2021-03-12 |
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| CN202011600871.9A Pending CN112473327A (en) | 2020-12-30 | 2020-12-30 | Dry tail gas processing system of artificial fiber board |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114130147A (en) * | 2021-07-13 | 2022-03-04 | 江苏威斯特环保冶金工程有限公司 | Wet-type dust removal and dust fall device for metallurgical furnace and use method thereof |
| CN114314928A (en) * | 2022-01-04 | 2022-04-12 | 湖南烯富环保科技有限公司 | Integrated production line and method for removing chloride ions and regenerating dechlorination agent from dechlorination slag |
-
2020
- 2020-12-30 CN CN202011600871.9A patent/CN112473327A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114130147A (en) * | 2021-07-13 | 2022-03-04 | 江苏威斯特环保冶金工程有限公司 | Wet-type dust removal and dust fall device for metallurgical furnace and use method thereof |
| CN114314928A (en) * | 2022-01-04 | 2022-04-12 | 湖南烯富环保科技有限公司 | Integrated production line and method for removing chloride ions and regenerating dechlorination agent from dechlorination slag |
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