CN101486017A - Wet coke-quenching aerial fog processing method and device based on non-thermal plasma injection - Google Patents
Wet coke-quenching aerial fog processing method and device based on non-thermal plasma injection Download PDFInfo
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- CN101486017A CN101486017A CNA2009100766147A CN200910076614A CN101486017A CN 101486017 A CN101486017 A CN 101486017A CN A2009100766147 A CNA2009100766147 A CN A2009100766147A CN 200910076614 A CN200910076614 A CN 200910076614A CN 101486017 A CN101486017 A CN 101486017A
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Abstract
The invention discloses a method and a device for processing wet quenching coke gas fog on the basis of athermal plasma injection. The method comprises the following steps that: in the ascending process, the hot gas fog generated by wet quenching coke sequentially passes through three processing steps including spray cooling, pre-dedusting on a baffle plate and athermal plasma purification, and is cooled in a spray cooling area; the cooled gas fog enters a pre-dedusting area on the baffle plate where the thicker and bigger water particles and coke powder in the gas fog are separated from the gas fog and impact to the baffle plate under the action of inertia; the remaining gas fog continues to ascend and enter an athermal plasma purification area where organic components, ammonia nitrogen and cyanide in the gas fog are oxidized by the athermal plasma; the water particles and the coke powder are charged and are transferred to a trapping pole plate directionally under the action of a high voltage electric field; and then the gas flow after subjected to the athermal plasma purification area continuous to ascend to the top of a coke quenching tower to be discharged. After the processing steps, the contents of water vapor and the coke powder discharged outside after one ton of coke is produced are controlled to be less than 0.05 ton and 5 grams respectively, and the removal rate of the organic components, the ammonia nitrogen and the cyanide can reach more than 80 percent.
Description
Technical field
The present invention relates to a kind of utilization and have the Athermal plasma of oxidation activity and the harmful constituent in the high voltage electric field purification aerosol, and separate, reclaim the method and the device of aerosol particle, belong to the energy-conserving and environment-protective field.Be particularly useful for purifying coke wet quenching and produce the polluters such as polycyclic aromatic hydrocarbon, volatile phenol, cyanide and ammonia nitriding compound in the aerosol and the method and apparatus of separation, recovered steam and coke powder.
Background technology
In process of coking, after red Jiao released from coke oven, cooling quenching in time prevented its oxidizing fire in atmosphere.At present coal chemical enterprise adopts wet quenching more, and its course of work is, after red Jiao pushes burnt car from coke oven, pushes the quenching tower bottom by locomotive traction along track, and water injector moment extinguishes red Jiao rapidly to the big water gaging of red burnt ejection.Meanwhile, instant water heat absorption vaporization produces a large amount of steam air mass, is carrying coke powder in the air mass secretly and is coming from coke or pollution components such as the polycyclic aromatic hydrocarbon of coke quenching water, volatile phenol, ammonia nitrogen and cyanide.Under thermodynamic activity, steam constitutes the rising aerosol together with pollution components such as coke powder, polycyclic aromatic hydrocarbon, volatile phenol, ammonia nitrogen and cyanides in quenching tower.
Adopt traditional baffle-type steam, dedusting recovery measure,, take out of, and it is still very big to enter steam, coke powder and the pollutant proportion of atmospheric environment with aerosol although can reclaim a certain amount of steam and coke powder.Thus, not only cause the wasting of resources, and major polluting atmosphere environment, be detrimental to health and ecological environment.Statistics shows, 1 ton of Jiao of every production effluxes about 0.5 ton of steam through the quenching tower top outlet, coke powder 100 grams.Pollutants such as polycyclic aromatic hydrocarbon, volatile phenol, ammonia nitrogen and cyanide are decided on used quenching water source with the outer discharge capacity of aerosol.The water that is used for quenching mainly contains biochemical station untreated water, back water and quenching recirculated water three classes are handled in biochemical station, effluxes pollutant ordering from high to low to be: biochemical station untreated water〉quenching recirculated water〉biochemical station handles water.Have measuring and calculating to show, adopt the untreated water quenching of biochemical station, 1 ton of Jiao of every production, efflux benzo [a] pyrene, volatile phenol, ammonia nitrogen and cyanide amount respectively up to 3 milligrams, 51500 milligrams, 69000 milligrams and 1875 milligrams.Even adopt biochemical station to handle the water quenching, 1 ton of Jiao of every production effluxes benzo [a] pyrene, volatile phenol, ammonia nitrogen and cyanide amount and also reaches 0.063 milligram, 71.2 milligrams, 1250 milligrams and 235 milligrams respectively.In fact, because not tight to the outer exhaust aerosol pollutant supervision of quenching tower, quenching tower has become the main path that many enterprises shift water pollutant.
China is coke production big country, produces more than 300,000,000 ton in coke per year, the place of production mainly be distributed in lack of water such as Shanxi, Henan and atmosphere pollution serious, the area that atmospheric environment capacity is low.Quenching makes the matter worse beyond doubt for the water resource and the environmental quality of locality, has become the factor of the local sustainable development of serious restriction.In the whole society today of growing interest energy-saving and emission-reduction, how to reclaim steam and coke powder that quenching effluxes, the pollution components that purifies in the quenching aerosol has become problem anxious to be solved.
Summary of the invention
The present invention is directed to existing coke wet quenching tower and lack pollutant purification effects such as effective polycyclic aromatic hydrocarbon, volatile phenol, ammonia nitrogen and cyanide, and problem such as separation, recovered steam and coke powder efficient is low, a kind of coke wet quenching tower aerosol purification and steam, coke powder recovery method and device are provided.Described method is based on applying high voltage, form high voltage electric field and the Athermal plasma with oxidation activity that electrion produces is injected among the aerosol, realize the pollution components such as polycyclic aromatic hydrocarbon, volatile phenol, ammonia nitrogen and cyanide in the synchronous purification wet coke-quenching aerial fog, and the purpose of separation, recovered steam and coke powder.
Technical solution of the present invention is: in quenching tower inside, arrange mist cooling device, deflection plate pre-dedusting device, non-thermal plasma reactor and elution device from the bottom to top successively.Wherein, the mist cooling device is made of the many pipelines that fuse, assembling nozzle on the pipeline, and the ejection mist plays the temperature that reduces the rising aerosol, promotes that steam condenses, grows up, and captures, separates the effect of big particle diameter coke powder and water particle.The deflection plate pre-dedusting device is one group of " it " font or corrugated plate type deflection plate of being distributed on whole section, rely on the inertial collision effect, go out bigger water particle of particle diameter and coke powder particle from gas phase separation, after reducing, connect the load of non-thermal plasma reactor, and play the uniform effect that enters non-thermal plasma reactor section air-flow.
Non-thermal plasma reactor by be arranged in the tower sparking electrode and trapping pole plate, insulation assembly and be arranged on the outer power supply of tower, dual pressure controller constitutes.Sparking electrode connects the high-pressure side of power supply, can be with making such as thin round wire, astroid, jaggies, prickle wires.Trapping pole plate can be used board making such as flat board, V shaped slab, deflection plate, is communicated with ground connection with tower body, the outer power supply low-pressure end of tower during installation.High-voltage suppling power plays to sparking electrode high-tension effect is provided, and can be positive polarity DC high-voltage power supply, negative polarity DC high-voltage power supply, high-voltage pulse power source, positive polarity high direct voltage stack interchange and negative polarity high direct voltage stack AC power.Insulation assembly comprises high voltage transmission line insulating sleeve, insulator and anti-caking mist device etc.
When applying high voltage, around electrode, can produce Athermal plasma with strong oxidation activity to sparking electrode.When the quenching aerosol passed through non-thermal plasma reactor, these non-thermal plasma physical efficiencys were injected among the aerosol, played the effect of the pollutants such as polycyclic aromatic hydrocarbon, volatile phenol, ammonia nitrogen and cyanide in the degraded aerosol, or made water particle or coke powder charging particle.Meanwhile,, can make the motion of charged water particle or coke powder grain orientation, be attached to trapping pole plate or tower body surface then, and form current by the high voltage electric field that forms between sparking electrode and the trapping pole plate.Finally, rely on the power effect for support, flow to the quenching tower bottom, realize that aerosol purifies the purpose of recovered steam and coke powder.
Elution device is made of the many pipelines that fuse, and assembling nozzle on the pipeline when long-pending when more dust is arranged on trapping pole plate, sparking electrode and the deflection plate, is opened elution device, cleans trapping pole plate, sparking electrode and deflection plate.
Compare with the Steam Recovery method with conventional wet quenching dedusting, advantage of the present invention is:
(1) by the effect of high voltage electric field, can significantly improve the separating of steam and coke powder, organic efficiency, make the outer draining of 1 ton of coke of every production and coke powder reduce to 0.05 ton and below 5 grams respectively.
(2) by injecting the strong Athermal plasma of oxidisability, pollution components such as the polycyclic aromatic hydrocarbon in the degradable aerosol, volatile phenol, ammonia nitrogen and cyanide make the amount of pollutant that enters atmosphere reduce more than 80%.
(3) part is injected into the Athermal plasma of aerosol; finally enter among the quenching waste water; can play the effect of pollutants such as polycyclic aromatic hydrocarbon, volatile phenol, ammonia nitrogen and cyanide in the further degradation water, thereby reduce the burden of subsequent wastewater treatment greatly or prevent that pollutant from shifting discharging.
(4) aerosol provided by the invention purifies and Steam Recovery method and install recyclable big water gaging and coke powder, and the outer discharge capacity of reduction polycyclic aromatic hydrocarbon, volatile phenol, ammonia nitrogen and cyanide has remarkable economical, environment and social benefit.
Description of drawings
Fig. 1 is based on the flow chart that Athermal plasma inject to purify wet coke-quenching aerial fog and recovered steam, coke powder;
Fig. 2 is based on the structural representation that Athermal plasma inject to purify wet coke-quenching aerial fog and recovered steam, the used quenching tower of coke powder;
Among the figure:
1 coke quenching cart, 2 quenching towers, 3 water pipes
4 nozzles, 5 water pipes, 6 nozzles
7 deflection plates, 8 trapping pole plate, 9 sparking electrodes
10 water pipes, 11 drip washing nozzles, 12 insulators
13 high-voltage connections, 14 high voltage sourcies, 15 power-supply controller of electric
16 quenching ponds
The specific embodiment
Below in conjunction with accompanying drawing Athermal plasma of the present invention being injected the purification quenching aerosol and the method for recovered steam and the specific embodiment of device describes.
As shown in Figure 1 and Figure 2, when coke quenching cart 1 entered quenching tower 2, quenching and quenching aerosol treatment system were started working.Coke quenching water is delivered to nozzle 4 by water pipe 3, and coke quenching water sprays to red defocused, heat absorption rapidly, and part is converted into vapours, and meanwhile, vapours also induces outside air to enter quenching tower 2.Under the buoyancy of vapours and induced air, can produce one by steam, outside air, coke powder and water particle, and the aerosol that moves upward that constitutes from the components such as polycyclic aromatic hydrocarbon, volatile phenol, ammonia nitrogen and cyanide that coke quenching water and coke volatilize.In the aerosol uphill process, at first enter the spray drop warm area, in this zone, atomizing cooling water is delivered to nozzle 6 ejections by water pipe 5, can make the cooling of quenching aerosol from the water smoke of nozzle 6 ejections, and part steam condenses and grows up into water particle in the aerosol, big water particle and coke powder are under deadweight or whereabouts water particle collision effect, from the rising aerosol, separate, fall at the bottom of the quenching tower, and flow to quenching pond 16.Then, aerosol rises and enters deflection plate 7, and under the inertial collision effect, thicker water particle separates from air-flow with coke powder, and strikes on the deflection plate, pools liquid and wanders into the quenching tower bottom, and flow to quenching pond 16.Deflection plate 7 also has uniform air-flow except that playing pre-dedusting effect, make air-flow in the equally distributed effect of quenching tower section.At last, aerosol enters the Athermal plasma active region, this area arrangements the trapping pole plate 8 of reliable ground, sparking electrode 9 and insulator 12.High voltage can be caused sparking electrode 9 by high-voltage connection 13, high voltage source 14 and power-supply controller of electric 15, under action of high voltage, produce Athermal plasma, and be injected among the aerosol.These Athermal plasmas have very strong oxidation, and can the degrade contained organic component of aerosol, ammonia nitrogen and cyanide etc. make them innoxious.On the other hand, make water particle, coke powder isosol particle in the aerosol charged, charged particle is under the high voltage electric field effect, and directional migration is to trapping pole plate 8, and is captured, and separates from gas phase, and purified gas drains into atmosphere outward.Water that gathers on trapping pole plate 8 and the sparking electrode 9 and grit are relied on the power effect for support, finally flow to quenching pond 16.Through after the above-mentioned processing, can make produce 1 ton of coke efflux water vapour and coke powder reduce to respectively restrain for 0.05 ton and 5 below, the removal efficiency of polycyclic aromatic hydrocarbon, volatile phenol, ammonia nitrogen and cyanide reaches more than 80%.
The quenching tower top is provided with the drip washing facility, when trapping pole plate 8, sparking electrode 9 and deflection plate 7 are long-pending when more grit is arranged, can open the drip washing facility, carries out drip washing and handles.Washing water is delivered to drip washing nozzle 11 by water pipe 10, and washing water at first sprays to trapping pole plate 8 and sparking electrode 9, removes the laying dust on it.Then, drop down onto deflection plate 7, remove the laying dust on the deflection plate 7, fall into quenching tower 2 bottoms at last, and flow to quenching pond 16.The drip washing operation must be carried out in the not quenching period, at this moment, did not apply high voltage on the sparking electrode 9.
Claims (10)
1, the wet coke-quenching aerial fog processing method that injects based on Athermal plasma is characterized in that:
The streamer that coke wet quenching produces passes through mist cooling, the pre-dedusting of deflection plate and three treatment steps of Athermal plasma purifying successively in uphill process; At the spray drop warm area, realize cooling to streamer from the water smoke of atomizer ejection; Cooled aerosol enters the pre-dedusting area of deflection plate, and thicker water particle and coke powder separate from aerosol and strike on the deflection plate under effect of inertia in the aerosol; Remaining aerosol enters the Athermal plasma purifying district by continuing rising behind the deflection plate; In the Athermal plasma purifying district, the organic component in the aerosol, ammonia nitrogen and cyanide are by the Athermal plasma oxidation; Water particle in the aerosol and coke powder are charged and under the high voltage electric field effect, and directional migration is to trapping pole plate; Air-flow through the Athermal plasma purifying district continues to rise to the discharge of quenching tower top, finishes wet coke-quenching aerial fog and handles overall process.
2, the wet coke-quenching aerial fog processing method that injects based on Athermal plasma according to claim 1, it is characterized in that: when trapping pole plate, sparking electrode and deflection plate are long-pending when more grit is arranged, open the drip washing nozzle at quenching tower top, utilize clear water drip washing trapping pole plate, sparking electrode and deflection plate.
3, a kind of device of realizing the described wet coke-quenching aerial fog processing method that injects based on Athermal plasma of claim 1, it is characterized in that: quenching tower inside sets gradually mist cooling nozzle, deflection plate pre-duster, non-thermal plasma reactor and drip washing nozzle from bottom to top.
4, device according to claim 3 is characterized in that: described non-thermal plasma reactor comprises trapping pole plate, sparking electrode and insulator.
5, device according to claim 4 is characterized in that: described trapping pole plate is used for capturing the mist and the grit of aerosol; Trapping pole plate adopts flat board, V shaped slab or deflection plate pattern.
6, device according to claim 4 is characterized in that: described sparking electrode adopts thin round wire, astroid, jaggies or prickle wire pattern.
7, device according to claim 3 is characterized in that: described non-thermal plasma reactor is under action of high voltage, produces Athermal plasma, and plasma is injected among the aerosol; High voltage is to cause sparking electrode by high voltage source and high-voltage connection, and its voltage is regulated and control by power-supply controller of electric.
8, device according to claim 7 is characterized in that: described high voltage source comprises positive polarity DC high-voltage power supply, negative polarity DC high-voltage power supply, high-voltage pulse power source, positive polarity high direct voltage stack AC power or negative polarity high direct voltage stack AC power.
9, device according to claim 3 is characterized in that: described deflection plate is corrugated or " it " font.
10, according to any described device of claim in claim 4 or 7, it is characterized in that: during installation, trapping pole plate is communicated with the high voltage source low-pressure end and reliable ground.
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