CN215667833U - System for organic fluorine-containing waste liquid is handled and is retrieved - Google Patents
System for organic fluorine-containing waste liquid is handled and is retrieved Download PDFInfo
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- CN215667833U CN215667833U CN202120677037.3U CN202120677037U CN215667833U CN 215667833 U CN215667833 U CN 215667833U CN 202120677037 U CN202120677037 U CN 202120677037U CN 215667833 U CN215667833 U CN 215667833U
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- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 239000011737 fluorine Substances 0.000 title claims abstract description 61
- 229910052731 fluorine Inorganic materials 0.000 title claims abstract description 61
- 239000007788 liquid Substances 0.000 title claims abstract description 58
- 239000002699 waste material Substances 0.000 title claims abstract description 53
- 238000000197 pyrolysis Methods 0.000 claims abstract description 184
- 239000007789 gas Substances 0.000 claims abstract description 100
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 70
- 239000003546 flue gas Substances 0.000 claims abstract description 70
- 239000002918 waste heat Substances 0.000 claims abstract description 37
- 238000000746 purification Methods 0.000 claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 238000004064 recycling Methods 0.000 claims abstract description 13
- 239000003795 chemical substances by application Substances 0.000 claims description 17
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 14
- 239000002893 slag Substances 0.000 claims description 13
- 238000002485 combustion reaction Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 10
- 238000005188 flotation Methods 0.000 claims description 10
- 239000000292 calcium oxide Substances 0.000 claims description 7
- 235000012255 calcium oxide Nutrition 0.000 claims description 7
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 6
- 239000000920 calcium hydroxide Substances 0.000 claims description 6
- 235000011116 calcium hydroxide Nutrition 0.000 claims description 6
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 6
- HUAUNKAZQWMVFY-UHFFFAOYSA-M sodium;oxocalcium;hydroxide Chemical compound [OH-].[Na+].[Ca]=O HUAUNKAZQWMVFY-UHFFFAOYSA-M 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 24
- YLQBMQCUIZJEEH-UHFFFAOYSA-N Furan Chemical compound C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 abstract description 6
- 150000002222 fluorine compounds Chemical class 0.000 abstract description 4
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 abstract description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 3
- 239000003344 environmental pollutant Substances 0.000 abstract description 3
- 229910052760 oxygen Inorganic materials 0.000 abstract description 3
- 239000001301 oxygen Substances 0.000 abstract description 3
- 231100000719 pollutant Toxicity 0.000 abstract description 3
- 125000004122 cyclic group Chemical group 0.000 abstract description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 14
- 229910001634 calcium fluoride Inorganic materials 0.000 description 8
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 7
- 239000002253 acid Substances 0.000 description 6
- 159000000007 calcium salts Chemical class 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 3
- 238000006115 defluorination reaction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000009388 chemical precipitation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000008267 milk Substances 0.000 description 2
- 210000004080 milk Anatomy 0.000 description 2
- 235000013336 milk Nutrition 0.000 description 2
- 239000010815 organic waste Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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- Treating Waste Gases (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The utility model discloses a system for treating and recycling organic fluorine-containing waste liquid, which comprises an oxygen-free pyrolysis device, a heat supply device, a pyrolysis gas purification device, an ash sorting device, a waste heat utilization device and a flue gas treatment system, wherein the oxygen-free pyrolysis device is connected with the heat supply device; organic macromolecular fluorides in the organic fluorine-containing waste liquid are pyrolyzed into inorganic micromolecular fluorides by the aid of the anaerobic pyrolysis device, oxygen does not participate in the pyrolysis process, pollutants such as furan and dioxin are not generated, pyrolysis gas generated in the pyrolysis process is treated by the pyrolysis gas purification device and then is led to the heat supply device, the heat supply device supplies heat to the anaerobic pyrolysis device by means of heat in the pyrolysis gas, and cyclic utilization of heat energy is achieved; high-temperature flue gas generated in the heating process of the anaerobic pyrolysis device is led to a waste heat utilization device, and the waste heat utilization device recovers and utilizes the redundant heat of the flue gas; the ash generated in the pyrolysis process is separated and recycled by the ash sorting device, so that the resource utilization of the organic fluorine-containing waste liquid pyrolysis ash is realized.
Description
Technical Field
The utility model relates to the technical field of industrial waste liquid recovery, in particular to a system for treating and recovering organic fluorine-containing waste liquid.
Background
In the production processes of fluorine chemical industry, steel industry, glass industry and the like, a large amount of organic fluorine-containing waste liquid is inevitably generated because the raw materials contain fluorine elements or fluorine-containing substances are added in the production process. The organic fluorine-containing waste liquid has the characteristics of complex components, higher concentration, high chromaticity, low biochemical property and wider distribution, so the organic fluorine-containing waste liquid is difficult to treat. The discharge of the organic fluorine-containing waste liquid causes water body pollution and air pollution, and seriously affects the human health.
With the development of industrial level, the harm of organic fluorine-containing waste liquid to drinking water, soil and the like is increasingly paid attention by people. Meanwhile, the quantity of fluorite (the main raw material in the fluorine chemical industry, the main component of which is CaF2) is seriously exhausted, so the harmless treatment and resource recovery technology of the organic fluorine-containing waste liquid has obvious practical significance and wide application prospect.
The existing method for treating industrial organic fluorine-containing waste liquid mainly comprises a chemical precipitation method, an incineration method, a membrane separation method, an adsorption method, an extraction method and the like, but the membrane separation method, the adsorption method and the extraction method have the problems of low treatment efficiency, incomplete treatment and the like of the organic fluorine-containing waste liquid; the flue gas or percolate treated by the chemical precipitation method and the incineration method still has great harm to the environment, and the method can not recover the fluorine element in the waste liquid, thereby causing waste.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to provide a system for treating and recycling organic fluorine-containing waste liquid, which is provided with an oxygen-free pyrolysis device capable of pyrolyzing the organic fluorine-containing waste liquid, wherein pyrolysis gas and ash are respectively sent to a pyrolysis gas purification device and an ash sorting device to recycle pyrolysis gas and fluorine elements after pyrolysis is finished.
The purpose of the utility model is realized by adopting the following technical scheme:
a system for treating and recycling organic fluorine-containing waste liquid comprises an oxygen-free pyrolysis device, a heat supply device, a pyrolysis gas purification device, an ash sorting device, a waste heat utilization device and a flue gas treatment system; a defluorinating agent is filled in the anaerobic pyrolysis device; a pyrolysis gas outlet of the oxygen-free pyrolysis device is connected with a pyrolysis gas inlet of the pyrolysis gas purification device, and a flue gas outlet of the oxygen-free pyrolysis device is connected with a flue gas inlet of the waste heat utilization device; a pyrolysis gas outlet of the pyrolysis gas purification device is connected with a pyrolysis gas inlet of the heat supply device, and an output end of the heat supply device is connected with the oxygen-free pyrolysis device; the flue gas outlet of the waste heat utilization device is connected with the flue gas inlet of the flue gas treatment system; an ash outlet of the anaerobic pyrolysis device is connected with an ash inlet of the ash sorting device.
The anaerobic pyrolysis device is filled with alkaline defluorinating agent solid particles for absorbing fluorine-containing acid gas generated after pyrolysis and performing dry defluorination to prevent the generated acid gas from corroding subsequent equipment. The anaerobic pyrolysis device is in a closed anaerobic state, oxygen is not involved in the pyrolysis process, pollutants such as furan, dioxin and the like are not generated, organic macromolecular fluoride can be converted into inorganic micromolecular fluoride by high-temperature pyrolysis, and carbon powder and calcium salt (CaF) in ash slag2) Recovered through an ash sorting device. The pyrolysis gas generated in the pyrolysis process is treated by a pyrolysis gas purification device to remove fluorine-containing gas in the pyrolysis gas, and the fluorine-containing gas is acidic and is generally absorbed by an alkaline substance. The purified pyrolysis gas is led to a heat supply device, and the heat supply device heats the pyrolysis gas and provides heat for the oxygen-free pyrolysis device. High-temperature flue gas generated by the oxygen-free pyrolysis device in the heating process is led to the waste heat utilization device, and the waste heat utilization device recycles the redundant heat of the flue gas. The flue gas exhausted by the waste heat utilization device can be discharged after being purified by a flue gas treatment system.
Further, the anaerobic pyrolysis device comprises a pyrolysis furnace and a heating jacket, the heating jacket is arranged outside the pyrolysis furnace, and a flue gas outlet of the heating jacket is connected with a flue gas inlet of the waste heat utilization device; the pyrolysis furnace is provided with an atomizing nozzle; the defluorinating agent is filled in the pyrolysis furnace, and the fed material is fed through the atomizing nozzle, so that the entering organic fluorine-containing waste liquid is changed into small liquid drops due to the internal and external pressure difference, the heated area of the waste liquid is increased, and the pyrolysis efficiency of the organic fluorine-containing waste liquid is improved.
Still further, the defluorination agent is one or more than two of quicklime, soda lime or slaked lime.
Furthermore, the pyrolysis gas purification device is a deacidification device which is filled with an alkaline agent.
Still further, the alkaline agent is one or more of quicklime, soda lime or slaked lime.
Further, the heat supply device comprises a hot blast stove, a pyrolysis gas fan and a combustion-supporting fan, wherein a pyrolysis gas inlet of the pyrolysis gas fan is connected with a pyrolysis gas outlet of the pyrolysis gas purification device, and a pyrolysis gas outlet of the pyrolysis gas fan is connected with a pyrolysis gas inlet of the hot blast stove; the hot blast stove is connected with a combustion fan.
Wherein, the pyrolysis of the organic fluorine-containing waste liquid needs enough energy, so the hot blast stove is arranged to provide energy for the pyrolysis furnace, and the energy generated by the hot blast stove mainly comes from the combustion of pyrolysis gas. The pyrolysis gas fan is used for sending the defluorinated pyrolysis gas into the hot blast stove, and simultaneously blowing air for auxiliary combustion to generate high-temperature flue gas for heating the pyrolysis furnace, so that the heat of the pyrolysis gas is recycled. The hot blast stove controls the temperature of the burned flue gas to be 800-1100 ℃, and ensures that the organic waste liquid in the pyrolysis furnace can be effectively and completely pyrolyzed.
Still further, the ash sorting device comprises a water-cooling spiral slag extractor, an ash collecting box and a flotation device; the ash residue outlet of the anaerobic pyrolysis device is connected with the ash residue inlet of the water-cooling spiral slag discharging machine, the ash residue outlet of the water-cooling spiral slag discharging machine is connected with the ash residue inlet of the ash residue collecting box, and the ash residue inlet of the flotation device is connected with the ash residue outlet of the ash residue collecting box.
Further, the waste heat utilization device is one of a waste heat boiler, a water-cooled heat exchanger or an air-cooled heat exchanger.
Still further, the flue gas treatment system comprises a flue gas treatment device, a tail exhaust fan and a chimney which are sequentially connected; and a flue gas inlet of the flue gas treatment device is connected with a flue gas outlet of the waste heat utilization device. The flue gas treatment device comprises one or more of a dust removal device, a spraying device, a deacidification device and an activated carbon adsorption device. The purified flue gas is introduced into a chimney by a tail exhaust fan to be discharged.
The process for treating and recovering the organic fluorine-containing waste liquid comprises the following steps:
1) the organic fluorine-containing waste liquid enters an anaerobic pyrolysis device to be pyrolyzed at 500-600 ℃, and a defluorinating agent in the anaerobic pyrolysis device is used for absorbing fluorine-containing acid gas generated after pyrolysis;
2) pyrolysis gas generated by the anaerobic pyrolysis device is led to the pyrolysis gas purification device, and ash of the anaerobic pyrolysis device is conveyed to the ash sorting device; the pyrolysis temperature of the anaerobic pyrolysis device is controlled to be 500-600 ℃;
the temperature of the pyrolysis gas leaving the oxygen-free pyrolysis device is controlled at 400-500 ℃; pyrolysis gas refers to a gas containing H as a main component2、CO、CH4、C2H4、C2H6Low molecular weight compounds and acidic gases such as HF; the main components of the solid residue after pyrolysis are carbon powder and CaF2；
3) The pyrolysis gas purified by the pyrolysis gas purification device in the step 2) is led to a heat supply device, and the heat supply device sends heat to an oxygen-free pyrolysis device; high-temperature flue gas generated in the pyrolysis process of the oxygen-free pyrolysis device is sent to a waste heat utilization device to recover redundant heat, and the flue gas subjected to heat exchange of the waste heat utilization device is sent to a flue gas treatment system to be purified;
4) conveying the ash obtained in the step 2) to an ash sorting device, separating carbon powder and fluorine-containing salt according to the density difference of the carbon powder and calcium salt, and respectively recovering the carbon powder and the fluorine-containing salt.
Compared with the prior art, the utility model has the beneficial effects that:
(1) according to the utility model, the anaerobic pyrolysis device is arranged to pyrolyze organic macromolecular fluorides in the organic fluorine-containing waste liquid into inorganic micromolecular fluorides, oxygen is not involved in the pyrolysis process, pollutants such as furan, dioxin and the like are not generated, pyrolysis gas generated in the pyrolysis process is treated by the pyrolysis gas purification device and then is led to the heat supply device, and the heat supply device supplies heat to the anaerobic pyrolysis device by using heat in the pyrolysis gas, so that the cyclic utilization of heat energy is realized; high-temperature flue gas generated by the oxygen-free pyrolysis device in the heating process is led to the waste heat utilization device, and the waste heat utilization device recycles the redundant heat of the flue gas, so that the energy is not wasted; separating and recycling carbon powder and calcium fluoride from ash generated in the pyrolysis process through an ash sorting device, so as to realize resource utilization of the organic fluorine-containing waste liquid pyrolysis ash; the flue gas treatment system purifies the flue gas after heat exchange of the waste heat utilization device, so that harmful gas is prevented from being discharged; the system of the utility model realizes the harmlessness, reduction and recycling of the organic fluorine-containing waste liquid treatment.
(2) The pyrolysis gas generated in the organic fluorine-containing waste liquid pyrolysis process is used as the heating working medium, the pyrolysis gas is recycled through the heat supply device, the pyrolysis efficiency is improved, and the recycling multi-stage utilization of the organic fluorine-containing waste liquid is realized; the ash sorting technology is adopted, and the carbon powder and calcium fluoride are separated and recovered through a flotation process, so that the resource utilization of the pyrolysis ash generated by the organic fluorine-containing waste liquid is realized.
Drawings
FIG. 1 is a process flow diagram of the present invention
FIG. 2 is a process flow diagram of example 1;
FIG. 3 is a schematic view showing the connection of the apparatus of example 1;
in the figure: 1. a waste liquid tank; 2. a feed pump; 3. a pyrolysis furnace; 4. water-cooling the spiral slag extractor; 5. a flotation device; 6. a deacidification device; 7. a pyrolysis gas fan; 8. a combustion fan; 9. a hot blast stove; 10. a waste heat utilization device; 11. a flue gas treatment device; 12. a tail exhaust fan; 13. and (4) a chimney.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
Example 1
As shown in fig. 1, a system for treating and recycling organic fluorine-containing waste liquid comprises an oxygen-free pyrolysis device, a heat supply device, a pyrolysis gas purification device, an ash sorting device, a waste heat utilization device 10 and a flue gas treatment system; a defluorinating agent is filled in the anaerobic pyrolysis device; a pyrolysis gas outlet of the oxygen-free pyrolysis device is connected with a pyrolysis gas inlet of the pyrolysis gas purification device, and a flue gas outlet of the oxygen-free pyrolysis device is connected with a flue gas inlet of the waste heat utilization device 10; a pyrolysis gas outlet of the pyrolysis gas purification device is connected with a pyrolysis gas inlet of the heat supply device, and an output end of the heat supply device is connected with the oxygen-free pyrolysis device; the flue gas outlet of the waste heat utilization device 10 is connected with the flue gas inlet of the flue gas treatment system; an ash outlet of the anaerobic pyrolysis device is connected with an ash inlet of the ash sorting device.
Specifically, as shown in fig. 2 to 3, the anaerobic pyrolysis device includes a pyrolysis furnace 3 and a heating jacket, the heating jacket is disposed outside the pyrolysis furnace 3, and a flue gas outlet of the heating jacket is connected to a flue gas inlet of the waste heat utilization device 10; the atomizing nozzle is arranged at the top end of the pyrolysis furnace 3; the defluorinating agent is arranged in the pyrolysis furnace 3, and the fed material is fed through the atomizing nozzle, so that the entering organic fluorine-containing waste liquid is changed into small liquid drops due to the internal and external pressure difference, the heated area of the waste liquid is increased, and the pyrolysis efficiency of the organic fluorine-containing waste liquid is improved. Wherein the defluorination agent is one or more than two of quicklime, soda lime or slaked lime.
Further, the pyrolysis gas purification device is a deacidification device 6, and an alkaline agent is filled in the deacidification device 6. The alkaline agent is one or more than two of quicklime, soda lime or slaked lime.
Further, the heat supply device comprises a hot blast stove 9, a pyrolysis gas fan 7 and a combustion-supporting fan 8, a pyrolysis gas inlet of the pyrolysis gas fan 7 is connected with a pyrolysis gas outlet of the pyrolysis gas purification device (deacidification device 6), and a pyrolysis gas outlet of the pyrolysis gas fan 7 is connected with a pyrolysis gas inlet of the hot blast stove 9; the hot blast stove 9 is connected with a combustion fan 8. The pyrolysis of the organic fluorine-containing waste liquid needs enough energy, so the hot blast stove 9 is arranged to provide energy for the pyrolysis furnace 3, and the energy generated by the hot blast stove 9 mainly comes from the combustion of pyrolysis gas. The pyrolysis gas fan 7 is used for sending the defluorinated pyrolysis gas into the hot blast stove 9, and simultaneously blowing air for auxiliary combustion to generate high-temperature flue gas for heating the pyrolysis furnace 3, so that the heat of the pyrolysis gas is recycled. The hot blast stove 9 controls the temperature of the burned flue gas to be 800-1100 ℃, and ensures that the organic waste liquid in the pyrolysis furnace 3 can be effectively and completely pyrolyzed.
Still further, the ash sorting device comprises a water-cooling spiral slag extractor 4, an ash collecting box and a flotation device 5; an ash outlet of a pyrolysis furnace 3 in the anaerobic pyrolysis device is connected with an ash inlet of a water-cooling spiral slag extractor 4, an ash outlet of the water-cooling spiral slag extractor 4 is connected with an ash inlet of an ash collecting box, and an ash inlet of a flotation device 5 is connected with an ash outlet of the ash collecting box. The ash collection box is not shown in fig. 3, but the water-cooled screw slag extractor 4 can also directly send the ash to the flotation device 5. A water-cooled screw tap machine 4 is used to further dewater the residue.
Further, the waste heat utilization device 10 is one of a waste heat boiler, a water-cooled heat exchanger or an air-cooled heat exchanger.
Still further, the flue gas treatment system comprises a flue gas treatment device 11, a tail exhaust fan 12 and a chimney 13 which are connected in sequence; the flue gas inlet of the flue gas treatment device 11 is connected with the flue gas outlet of the waste heat utilization device 10.
The process for treating and recovering the organic fluorine-containing waste liquid comprises the following steps:
1) the organic fluorine-containing waste liquid is stored in a waste liquid pool 1 and is conveyed to a feed port of a pyrolysis furnace 3 through a feed pump 2, and an atomizing nozzle of the feed port atomizes the organic fluorine-containing waste liquid into small liquid drops with larger specific surface area. A heating jacket is arranged outside the pyrolysis furnace 3, and meanwhile quicklime is filled in the pyrolysis furnace 3 and used for absorbing acid gases such as HF and the like generated in the pyrolysis reaction process. The organic fluorine-containing waste liquid enters the pyrolysis furnace 3, and simultaneously, the high-temperature flue gas enters the outer heating jacket of the pyrolysis furnace 3 to indirectly heat the material, wherein the pyrolysis temperature is controlled at 550 ℃;
2) the gas product generated after the organic fluorine-containing waste liquid is pyrolyzed is led out from the bottom of the pyrolyzing furnace 3, solid ash is discharged from the bottom of the pyrolyzing furnace 3 through a water-cooling spiral slag discharging machine 4, carbon powder and calcium salt are separated through a flotation device 5 according to the density difference of the carbon powder and the calcium salt, the carbon powder and calcium fluoride are recycled, and fluorine is recycled in the form of calcium fluoride.
3) And (3) introducing pyrolysis gas generated after pyrolysis into a deacidification device 6, and deacidifying by a semi-dry method by using excessive lime milk in the deacidification device 6. The pyrolysis gas passes through a deacidification device 6, and the acid gas in the deacidification device reacts with lime milk to generate CaF2Further removing HF and other acidic gases in the waste water, and collecting CaF in deacidification device 62CaF separated from ash2Collected together and utilized, fluorine element is CaF2Is recovered.
4) The combustible pyrolysis gas deacidified in the step 3) is sent into a hot blast stove 9 through a pyrolysis gas fan 7 to be fully combusted, a combustion-supporting fan 8 blows air into the hot blast stove 9, and natural gas or liquefied gas can be introduced to assist combustion according to combustion conditions. High-temperature flue gas is generated after the pyrolysis gas is combusted, the temperature is 900 ℃, the high-temperature flue gas enters a heating jacket of the pyrolysis furnace 3, and the organic fluorine-containing waste liquid in the pyrolysis furnace 3 is indirectly heated;
5) the flue gas with the temperature of 600 ℃ after heat exchange is introduced into a waste heat utilization device 10 for waste heat recovery, the waste heat utilization device 10 is a steam boiler, and the generated steam is self-used or externally supplied. The flue gas after the waste heat utilization is further purified by a flue gas treatment device 11, and the flue gas treatment adopts a spray tower and an activated carbon adsorption mode to further remove acid gas and volatile organic gas in the flue gas. The purified flue gas is finally introduced into a chimney 13 through a tail exhaust fan 12 and exhausted into the atmosphere.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (9)
1. A system for treating and recycling organic fluorine-containing waste liquid is characterized by comprising an oxygen-free pyrolysis device, a heat supply device, a pyrolysis gas purification device, an ash sorting device, a waste heat utilization device and a flue gas treatment system; a defluorinating agent is filled in the anaerobic pyrolysis device; a pyrolysis gas outlet of the oxygen-free pyrolysis device is connected with a pyrolysis gas inlet of the pyrolysis gas purification device, and a flue gas outlet of the oxygen-free pyrolysis device is connected with a flue gas inlet of the waste heat utilization device; a pyrolysis gas outlet of the pyrolysis gas purification device is connected with a pyrolysis gas inlet of the heat supply device, and an output end of the heat supply device is connected with the oxygen-free pyrolysis device; the flue gas outlet of the waste heat utilization device is connected with the flue gas inlet of the flue gas treatment system; an ash outlet of the anaerobic pyrolysis device is connected with an ash inlet of the ash sorting device.
2. The system for treating and recycling organic fluorine-containing waste liquid as claimed in claim 1, wherein the oxygen-free pyrolysis device comprises a pyrolysis furnace and a heating jacket, the heating jacket is arranged outside the pyrolysis furnace, and a flue gas outlet of the heating jacket is connected with a flue gas inlet of the waste heat utilization device; the pyrolysis furnace is provided with an atomizing nozzle; the pyrolysis furnace is filled with defluorinating agent.
3. The system for treating and recovering an organic fluorine-containing waste liquid according to claim 1, wherein the defluorinating agent is one of quicklime, soda lime or slaked lime.
4. The system for treating and recycling organic fluorine-containing waste liquid according to claim 1, wherein the pyrolysis gas purification apparatus is a deacidification apparatus, and the deacidification apparatus is filled with an alkaline agent.
5. The system for treating and recycling organic fluorine-containing waste liquid according to claim 4, wherein the alkaline agent is one of quicklime, soda lime or slaked lime.
6. The system for treating and recycling organic fluorine-containing waste liquid according to claim 1, wherein the heat supply device comprises a hot blast stove, a pyrolysis gas fan and a combustion fan, a pyrolysis gas inlet of the pyrolysis gas fan is connected with a pyrolysis gas outlet of the pyrolysis gas purification device, and a pyrolysis gas outlet of the pyrolysis gas fan is connected with a pyrolysis gas inlet of the hot blast stove; the hot blast stove is connected with a combustion fan.
7. The system for treating and recovering organic fluorine-containing waste liquid according to claim 1, wherein the ash sorting device comprises a water-cooled screw slag extractor, an ash collection box and a flotation device; the ash residue outlet of the anaerobic pyrolysis device is connected with the ash residue inlet of the water-cooling spiral slag discharging machine, the ash residue outlet of the water-cooling spiral slag discharging machine is connected with the ash residue inlet of the ash residue collecting box, and the ash residue inlet of the flotation device is connected with the ash residue outlet of the ash residue collecting box.
8. The system for treating and recovering organic fluorine-containing waste liquid according to claim 1, wherein the waste heat utilization device is one of a waste heat boiler, a water-cooled heat exchanger or an air-cooled heat exchanger.
9. The system for treating and recycling organic fluorine-containing waste liquid according to claim 1, wherein the flue gas treatment system comprises a flue gas treatment device, a tail exhaust fan and a chimney which are connected in sequence; and a flue gas inlet of the flue gas treatment device is connected with a flue gas outlet of the waste heat utilization device.
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| CN113061448A (en) * | 2021-04-01 | 2021-07-02 | 广州维港环保科技有限公司 | A system and process for the treatment and recovery of organic fluorine-containing waste liquid |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113061448A (en) * | 2021-04-01 | 2021-07-02 | 广州维港环保科技有限公司 | A system and process for the treatment and recovery of organic fluorine-containing waste liquid |
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