CN103203239B - Regenerating flue gas denitrifying catalyst technique and system and device - Google Patents
Regenerating flue gas denitrifying catalyst technique and system and device Download PDFInfo
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- CN103203239B CN103203239B CN201310075885.7A CN201310075885A CN103203239B CN 103203239 B CN103203239 B CN 103203239B CN 201310075885 A CN201310075885 A CN 201310075885A CN 103203239 B CN103203239 B CN 103203239B
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Abstract
A kind of regenerating flue gas denitrifying catalyst technique and system and device, it belongs to the dust treatment technical field of coal fired power plant, its processing step carries out the cleaning of denitrating catalyst under being included in recurrent state, activation and the drying of denitrating catalyst is carried out under recurrent state, the composition of the cleaning agent used is: polyacrylic acid, NPE, AEO, sodium ascorbate; Control wind-warm syndrome 40 DEG C; The composition of described activating solution: oxalic acid, ammonium metavanadate, ammonium metatungstate; For controlling the formic acid 1%wt of pH value.The techniques such as the immersion of catalyst regeneration, cleaning, activation, reparation, drying concentrate in one or two container and complete by the present invention, significantly reduce regenerative system volume, simplify regenerative process and operating procedure, reduce energy consumption 50%, and avoid combustion gas contaminated air.
Description
Technical field:
The present invention relates to a kind of regenerating flue gas denitrifying catalyst technique and system and device, it belongs to the denitration technology field of the dust treatment technical field, particularly flue gas of coal fired power plant.
Background technology:
In recent years, the nitrogen oxide (NO of China's coal fired power plant
x) discharge capacity constantly rises.NO in 2010
xtotal emission volumn increases to 8,650,000 tons.Along with the continuous expansion of China's coal fired power plant installed capacity, to 2015 and the year two thousand twenty NO
xtotal emission volumn will reach 1116 and 1,234 ten thousand tons respectively.So just with society, great threat is caused to the environment of China.From 2012, China formulated stricter NO
xdischarge standard (100-200mg/m
3).In the coal-burning power plant of dense population areas, generally adopt efficient gas denitrifying technology-selective catalytic reduction (Selective catalytic reduction, SCR) technique.The principle of SCR method denitration is NO
xnontoxic N is reduced into by NH3 under catalyst action
2and H
2o.For ensureing the smooth and easy of flue gas circulation, denitrating catalyst generally adopts monoblock shape layout, and form has honeycomb fashion, flat and corrugated.Its main component is vanadic anhydride, and titanium dioxide is carrier, and tungstic acid is catalyst aid.The core of SCR denitrating flue gas method is catalyst.Because catalyst manufacturing technology is only grasped and raw-material cost by the offshore company of minority, so its price is very high, account for greatly 1/3rd of whole denitration engineering total price.Catalyst is in use by flying dust in flue gas, and arsenic, alkali metal and alkaline-earth metal, the impact of the compound such as sulfur dioxide and P elements, causes catalyst poisoning activity to decline gradually.Generally, 2-3 is only the service life of catalyst.Therefore, need at present to adopt catalyst regeneration mode to reduce production cost, moreover, the solid waste that employing catalyst regeneration can greatly reduce disposal decaying catalyst and produce, makes full use of limited rare earth resources, realizes the close friend to environment.
The regeneration technology of existing catalyst comprises the technological processes such as immersion, cleaning, activation, reparation, drying substantially, and these five techniques be divided into five independently unit complete, therefore the catalyst lifting carrying out more than 5 times is needed in process of production, technological process is long, time-consuming, too increase production cost.
Summary of the invention:
The object of the present invention is to provide one can significantly reduce regenerative system volume, simplify qi exhaustion denox catalyst regeneration technology and the system and device of regenerative process and operating procedure.
The object of the present invention is achieved like this:
A kind of regenerating flue gas denitrifying catalyst technique, it comprises following processing step:
A, the cleaning of denitrating catalyst: first need regenerate denitrating catalyst and load in cleaning activating tank, then sweet-water tank is passed through, cleaning fluid storage pool and small pump supplement demineralized water in cleaning activating tank, until salt solution floods catalyst, cleaning agent is added successively by medicine system, the composition of cleaning agent: polyacrylic acid 50 ~ 500mg/L, NPE 50 ~ 700mg/L, AEO 200 ~ 1000mg/L, sodium ascorbate 100 ~ 500mg/L, circulating fan is started while adding cleaning agent, aeration tube, water circulating pump and filter, cleaning fluid circulates under aerating gas effect, mix the medicament in cleaning fluid, finally add formic acid or citric acid 1 ~ 10%wt again, control cleaning fluid pH=2 ~ 5, scavenging period 1 ~ 5 hour, the cleaning fluid part of about 50% volume is entered cleaning fluid storage pool reuse, all the other enter waste water tank, by Waste Water Treatment and desalting system, reclaim demineralized water and send into sweet-water tank, closing baffle plate, starts circulating fan, heat pump, condenser, heat exchanger, controls wind-warm syndrome 40 ~ 120 DEG C, dry 2 ~ 5 hours,
The activation of B, denitrating catalyst: supplement demineralized water to cleaning activating tank by sweet-water tank, activating solution storage pool and small pump, until flood catalyst, then activating solution is added by medicine system, the composition of activating solution: oxalic acid 50 ~ 500mg/L, ammonium metavanadate 50 ~ 120mmol/L, ammonium metatungstate 20 ~ 100mmol/L; Start circulating fan, aeration tube, water circulating pump and filter, activating solution mixes through inside and outside circulation, activating catalyst; Activate after 1 ~ 5 hour, the activating solution part of about 50% volume is entered activating solution storage pool reuse, all the other enter waste water tank, by waste water pretreatment system and demineralizer, reclaim demineralized water and send into sweet-water tank, closing baffle plate, start circulating fan, heat pump, condenser, heat exchanger, control wind-warm syndrome 40 ~ 120 DEG C, dry 2 ~ 5 hours.
The composition of described cleaning agent is: polyacrylic acid 50mg/L, NPE 50mg/L, AEO 200mg/L, sodium ascorbate 100mg/L; Control wind-warm syndrome 40 DEG C; The composition of described activating solution: oxalic acid 50mg/L, ammonium metavanadate 50mmol/L, ammonium metatungstate 20mmol/L; For controlling the formic acid 1%wt of pH value.
The composition of described cleaning agent is polyacrylic acid 500mg/L, NPE 700mg/L, AEO 1000mg/L, sodium ascorbate 500mg/L; Control wind-warm syndrome 120 DEG C; The composition of described activating solution: oxalic acid 500mg/L, ammonium metavanadate 120mmol/L, ammonium metatungstate 100mmol/L; For controlling the citric acid 10%wt of pH value.
The composition of described cleaning agent is polyacrylic acid 200mg/L, NPE 400mg/L, AEO 600mg/L, sodium ascorbate 60mg/L; Control wind-warm syndrome 80 DEG C; The composition of described activating solution: oxalic acid 300mg/L, ammonium metavanadate 80mmol/L, ammonium metatungstate 60mmol/L.For controlling the formic acid 5%wt of pH value.
A kind of system and device for regenerating flue gas denitrifying catalyst technique, it comprises a chemicals dosing plant, a cleaning activating tank be connected with chemicals dosing plant, multiple aeration tube is provided with in described cleaning activating tank, aeration tube side is provided with baffle plate, the bottom of cleaning activating tank is provided with drainpipe; Water circulating pump in-line filter is connected to the exit of drainpipe by pipeline one end, and the other end passes into the top of cleaning activating tank.
Described cleaning activating tank is also connected to one by condenser, circulating fan, the drier that heat pump and heat exchanger are formed.
It also comprises a regenerative wastewater treatment system, the drainpipe place that described regenerative wastewater process adopts membrane treatment process to be included in cleaning activating tank is connected with membrane treatment appts in turn by pipeline, waste water tank, described regenerative wastewater treatment system passes into cleaning fluid storage pool and activating solution storage pool by pipeline, described activating solution storage pool is connected with a sweet-water tank by pipeline, is equipped with by-pass valve control described on the pipeline of the conveying liquid connected.
Also a Wastewater Pretreatment case is connected by pipeline between described membrane treatment appts and waste water tank.
The techniques such as the immersion of catalyst regeneration, cleaning, activation, reparation, drying concentrate in one or two container and complete by the present invention, significantly reduce regenerative system volume, simplify regenerative process and operating procedure, more than 5 times catalyst lifting steps in conventional regeneration method are made to be reduced to 1 time or 2 times, cleaning fluid can also be maintained and activating solution is limpid, blowing ash and acid pickling step and be a cleaning step in conventional regeneration technique, simplifying technique, improve and clean and activation effect.The cleaning fluid adopted forms the iron ion can more effectively removed in denitrating catalyst, reduces SO in denitrating catalyst use procedure
2oxygenation efficiency.The drying process of catalyst adopts heat pump technology and gas circulation technology, reduces energy consumption 50%, and avoids combustion gas contaminated air.Regenerative wastewater process adopts membrane treatment process, and process water outlet (demineralized water) recycles and reuses, and reduces water consumption and quantity of wastewater effluent.
Accompanying drawing illustrates:
Fig. 1 is system and device schematic diagram of the present invention
Fig. 2 is the structural representation of cleaning activating tank of the present invention
Fig. 3 is the C-C sectional view of Fig. 2 of the present invention
Fig. 4 is the structural representation of drying device of the present invention
Detailed description of the invention:
Below in conjunction with accompanying drawing 1, Fig. 2 and Fig. 3, the present invention is further detailed:
Embodiment 1:
In the present embodiment, technique of the present invention comprises following step:
A: the cleaning of denitrating catalyst: first need regenerate denitrating catalyst 2 and load in cleaning activating tank 1, then in cleaning activating tank 1, demineralized water is supplemented by sweet-water tank 27, cleaning fluid storage pool 17 and small pump 24, until salt solution floods catalyst 2, the brine strength used is:; Cleaning agent is added successively by medicine system 12, the composition of cleaning agent: polyacrylic acid 50mg/L, NPE 50mg/L, AEO 200mg/L, sodium ascorbate 100mg/L, start circulating fan 9, aeration tube 3, water circulating pump 6 and filter 7 while adding cleaning agent, cleaning fluid circulates under aerating gas effect, mix the medicament in cleaning fluid, finally add formic acid 1%wt again, control cleaning fluid pH=2 ~ 5; Scavenging period 1 ~ 5 hour; Through above-mentioned cleaning process, more effectively can remove the iron ion in denitrating catalyst, reduce SO in denitrating catalyst use procedure
2oxygenation efficiency.The cleaning fluid part of about 50% volume is entered cleaning fluid storage pool 17 reuse, all the other enter waste water tank 15, by waste water pretreatment system 14 and desalting system 13, reclaim demineralized water and send into sweet-water tank 27; Then closing baffle plate 5, starts circulating fan 9, heat pump 10, condenser 8, heat exchanger 11, controls wind-warm syndrome 40 ~ 120 DEG C, dry 2 ~ 5 hours; In the present invention, the drying of catalyst adopts heat pump technology and gas circulation technology, capable of reducing energy consumption 50%.
Waste water pretreatment system main purpose is the pH value in order to regulate waste water, and removes some to Strong oxdiative materials such as the with serious pollution chlorine of composite membrane in next step film processing system.Such as, containing a large amount of acid wash liquid in waste water, at this time can add a certain amount of alkali lye (as NaOH) when Wastewater Pretreatment regulate the pH of waste water to proper range thus the film separation system adapting to next step, and can not cause excessively by force the aging of short time inner membrance because of acidity, even decomposes.In above-mentioned technological process device start order and technological parameter as follows:
The activation of B, denitrating catalyst: supplement demineralized water to cleaning activating tank 1 by sweet-water tank 27, activating solution storage pool 18 and small pump 24, until flood catalyst 2, then activating solution is added by medicine system 12, the composition of activating solution: oxalic acid 50mg/L, ammonium metavanadate 50mmol/L, ammonium metatungstate 20mmol/L; Start circulating fan 9, aeration tube 3, water circulating pump 6 and filter 7, activating solution mixes through inside and outside circulation, activating catalyst; Activate after 1 ~ 5 hour, the activating solution part of about 50% volume is entered activating solution storage pool 18 reuse, all the other enter waste water tank 15, by waste water pretreatment system 14 and demineralizer 13, reclaim demineralized water and send into sweet-water tank 27, the process of waste water can be realized like this and reuse, decrease environmental pollution, also Appropriate application waste water resource.Activation procedure completes and after being disposed by activating solution, closing baffle plate 5, starts circulating fan 9, heat pump 10, condenser 8, heat exchanger 11, controls wind-warm syndrome 40 DEG C, dry 2 ~ 5 hours, completes the drying of regenerated catalyst.
In the present embodiment, technique of the present invention completes in following device: it comprises a chemicals dosing plant, a cleaning activating tank 1 be connected with chemicals dosing plant, multiple aeration tube 3 is provided with in described cleaning activating tank, aeration tube side is provided with baffle plate 5, the bottom of cleaning activating tank is provided with drainpipe 4; Water circulating pump 6 in-line filter 7 is connected to the exit of drainpipe 4 by pipeline one end, the other end passes into the top of cleaning activating tank.Described cleaning activating tank is also connected to one by condenser 8, circulating fan 9, the drier that heat pump 10 and heat exchanger 11 are formed.
It also comprises a regenerative wastewater treatment system, drainpipe 4 place that described regenerative wastewater process adopts membrane treatment process to be included in cleaning activating tank is connected with membrane treatment appts 13 in turn by pipeline, waste water tank 15, described regenerative wastewater treatment system passes into cleaning fluid storage pool 17 and activating solution storage pool 18 by pipeline, described activating solution storage pool 18 is connected with a sweet-water tank by pipeline, is equipped with by-pass valve control described on the pipeline of the conveying liquid connected.
Also a Wastewater Pretreatment case 14 is connected by pipeline between described membrane treatment appts 13 and waste water tank 15.
Embodiment 2:
In the present embodiment, the composition of described cleaning agent is polyacrylic acid 500mg/L, NPE 700mg/L, AEO 1000mg/L, sodium ascorbate 500mg/L; Control wind-warm syndrome 120 DEG C; The composition of described activating solution: oxalic acid 500mg/L, ammonium metavanadate 120mmol/L, ammonium metatungstate 100mmol/L; For controlling the citric acid 10%wt of pH value.
Other parts of the present embodiment are identical with embodiment 1.
Embodiment 3:
The composition of cleaning agent described is in the present embodiment polyacrylic acid 200mg/L, NPE 400mg/L, AEO 600mg/L, sodium ascorbate 60mg/L; Control wind-warm syndrome 80 DEG C; The composition of described activating solution: oxalic acid 300mg/L, ammonium metavanadate 80mmol/L, ammonium metatungstate 60mmol/L.For controlling the formic acid 5%wt of pH value.
Other parts of the present embodiment are identical with embodiment 1.
Claims (3)
1. a regenerating flue gas denitrifying catalyst technique, it comprises following processing step:
A, the cleaning of denitrating catalyst: first need regenerate denitrating catalyst (2) and load in cleaning activating tank (1), then by sweet-water tank (27), cleaning fluid storage pool (17) and small pump (24) supplement demineralized water in cleaning activating tank (1), until demineralized water floods catalyst (2), cleaning agent is added successively by medicine system (12), the composition of cleaning agent: polyacrylic acid 50 ~ 500mg/L, NPE 50 ~ 700mg/L, AEO 200 ~ 1000mg/L, sodium ascorbate 100 ~ 500mg/L, circulating fan (9) is started while adding cleaning agent, aeration tube (3), water circulating pump (6) and filter (7), cleaning fluid circulates under aerating gas effect, mix the medicament in cleaning fluid, finally add formic acid or citric acid 1 ~ 10%wt again, control cleaning fluid pH=2 ~ 5, scavenging period 1 ~ 5 hour, the cleaning fluid part of 50% volume is entered cleaning fluid storage pool (17) reuse, all the other enter waste water tank 15, by Waste Water Treatment (14) and desalting system, reclaim demineralized water and send into sweet-water tank (27), closing baffle plate (5), starts circulating fan (9), heat pump (10), condenser (8), heat exchanger (11), controls wind-warm syndrome 40 ~ 120 DEG C, dry 2 ~ 5 hours,
The activation of B, denitrating catalyst: supplement demineralized water to cleaning activating tank (1) by sweet-water tank (27), activating solution storage pool (18) and small pump (24), until flood catalyst (2), then activating solution is added by medicine system (12), the composition of activating solution: oxalic acid 50 ~ 500mg/L, ammonium metavanadate 50 ~ 120mmol/L, ammonium metatungstate 20 ~ 100mmol/L; Start circulating fan (9), aeration tube (3), water circulating pump (6) and filter (7), activating solution mixes through inside and outside circulation, activating catalyst; Activate after 1 ~ 5 hour, the activating solution part of 50% volume is entered activating solution storage pool (18) reuse, all the other enter waste water tank (15), by waste water pretreatment system (14) and desalting system, reclaim demineralized water and send into sweet-water tank (27), closing baffle plate (5), start circulating fan (9), heat pump (10), condenser (8), heat exchanger (11), control wind-warm syndrome 40 ~ 120 DEG C, dry 2 ~ 5 hours.
2. regenerating flue gas denitrifying catalyst technique as described in claim 1, is characterized in that the composition of described cleaning agent is: polyacrylic acid 50mg/L, NPE 50mg/L, AEO 200mg/L, sodium ascorbate 100mg/L; Control wind-warm syndrome 40 DEG C; The composition of described activating solution: oxalic acid 50mg/L, ammonium metavanadate 50mmol/L, ammonium metatungstate 20mmol/L; For the formic acid 1%wt of control ph.
3. regenerating flue gas denitrifying catalyst technique as described in claim 1, is characterized in that the composition of described cleaning agent is polyacrylic acid 500mg/L, NPE 700mg/L, AEO 1000mg/L, sodium ascorbate 500mg/L; Control wind-warm syndrome 120 DEG C; The composition of described activating solution: oxalic acid 500mg/L, ammonium metavanadate 120mmol/L, ammonium metatungstate 100mmol/L; For the citric acid 10%wt of control ph.
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| CN103508491B (en) * | 2013-09-23 | 2015-12-02 | 宜兴市宜刚环保工程材料有限公司 | Discarded honeycomb type denitrification catalyst regeneration and resource utilization method |
| CN104667997A (en) * | 2015-01-14 | 2015-06-03 | 北京华电斯莱克顿技术有限公司 | SCR catalyst regeneration method |
| CN104826494B (en) * | 2015-04-17 | 2017-12-26 | 成都易态科技有限公司 | The renovation process of flue gas SCR denitration oxidation catalyst filter element |
| CN107570128B (en) * | 2016-07-05 | 2020-08-07 | 江苏中科睿赛污染控制工程有限公司 | Industrial waste Al2O3System and method for regenerating small balls |
| CN106215560B (en) * | 2016-08-31 | 2018-04-13 | 苏州贝捷环保设备有限公司 | Dust chemical catalysis parallel processors are used in coal-fired flue-gas processing |
| CN107043656B (en) * | 2017-04-24 | 2019-08-02 | 中国天辰工程有限公司 | It is a kind of for washing the dispersing agent and wash mill of sial phosphorus molecular sieve |
| CN113156881A (en) * | 2021-04-07 | 2021-07-23 | 苏州西热节能环保技术有限公司 | Denitration catalyst regeneration process medicament dosing control device and dosing control method |
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| CN102764675A (en) * | 2011-05-05 | 2012-11-07 | 中国科学院城市环境研究所 | Formula for coal-fired flue gas denitrification catalyst activity regeneration |
| CN202356105U (en) * | 2011-11-07 | 2012-08-01 | 河南神马尼龙化工有限责任公司 | Ruthenium catalyst regenerating device |
| CN202516560U (en) * | 2012-01-17 | 2012-11-07 | 西安交通大学 | On-line cleaning and regeneration device for catalyst |
| CN203184021U (en) * | 2013-03-08 | 2013-09-11 | 深圳市水苑水工业技术设备有限公司 | Flue gas denitration catalyst regeneration device |
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