CN103203239A - Technique and system device for regenerating exhaust gas denitration catalyst - Google Patents
Technique and system device for regenerating exhaust gas denitration catalyst Download PDFInfo
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- CN103203239A CN103203239A CN2013100758857A CN201310075885A CN103203239A CN 103203239 A CN103203239 A CN 103203239A CN 2013100758857 A CN2013100758857 A CN 2013100758857A CN 201310075885 A CN201310075885 A CN 201310075885A CN 103203239 A CN103203239 A CN 103203239A
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Abstract
The invention relates to a technique and a system device for regenerating exhaust gas denitration catalyst, and belongs to the technical field of exhaust gas processing of coal-fired power plant. The processing steps includes cleaning the denitration catalyst in a recirculation state and performing activation and dehydration on the denitration catalyst in the recirculation state. The detergent is composed of polyacrylic acid, nonylphenol polyoxyethylene ether, fatty alcohol-polyoxyethylene ether and sodium ascorbate; temperature is controlled at 40 DEG C; the activate fluid is composed of oxalic acid, ammonium metavanadate, ammonium metatungstate; and methane acid used for controlling PH value is 1% wt. The processes of soaking, cleaning, activating, dehydrating and the like for regenerating catalyst are integrated to implement in one container or two, so that volume of regeneration system is remarkably reduced, regeneration procedure and operation steps are simplified, energy consumption is reduced by 50%, and air pollution caused by exhaust gas is avoided.
Description
Technical field:
The present invention relates to a kind of catalyst for denitrating flue gas regeneration technology 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 environment and the society to China causes great threat.Since 2012, China formulated stricter NO
XDischarge standard (100-200mg/m
3).In the coal-burning power plant of dense population areas, generally adopted gas denitrifying technology-selective catalytic reduction (Selective catalytic reduction, SCR) technology efficiently.The principle of SCR method denitration is NO
XUnder catalyst action, be reduced into nontoxic N by NH3
2And H
2O.For guaranteeing the smooth and easy of flue gas circulation, denitrating catalyst generally adopts monoblock shape layout, and form has honeycomb fashion, and is 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 the catalyst manufacturing technology is only grasped and raw-material cost by the offshore company of minority, so its price is very high, accounts for 1/3rd of whole denitration engineering total price greatly.Catalyst in use is subjected to flying dust in the flue gas, arsenic, and alkali metal and alkaline-earth metal, the influence of compounds such as sulfur dioxide and P elements causes the catalyst poisoning activity to descend gradually.Generally speaking, only be 2-3 the service life of catalyst.Therefore, need at present to adopt the catalyst regeneration mode to reduce production costs, moreover, adopt catalyst regeneration can significantly reduce the solid waste of disposing decaying catalyst and producing, take full advantage of limited rare earth resources, realize the close friend to environment.
The regeneration technology of existing catalyst comprises technological processes such as immersion, cleaning, activation, reparation, drying substantially, and these five technologies be divided into five independently the unit finish, therefore the catalyst that needs in process of production to carry out more than 5 times lifts, technological process is long, time-consuming, also increased production cost.
Summary of the invention:
The object of the present invention is to provide and a kind ofly can reduce the regenerative system volume significantly, 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 catalyst for denitrating flue gas regeneration technology, it comprises following processing step:
A, the cleaning of denitrating catalyst: the denitrating catalyst of at first need regenerating is packed into and is cleaned in the activation pond, pass through sweet-water tank then, cleaning fluid storage pool and small pump replenish demineralized water to cleaning in the activation pond, flood catalyst until salt solution, add cleaning agent 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, start circulating fan when adding cleaning agent, aeration tube, water circulating pump and filter, cleaning fluid circulates under the effect of aeration gas, mix the medicament in the cleaning fluid, add formic acid or citric acid 1～10%wt at last again, control cleaning fluid pH=2～5; Scavenging period 1～5 hour; The cleaning fluid of about 50% volume is partly entered the 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; Close baffle plate, start circulating fan, heat pump, condenser, heat exchanger, 40～120 ℃ of control wind-warm syndrome, dry 2～5 hours;
The activation of B, denitrating catalyst: replenish demineralized water to cleaning the activation pond by sweet-water tank, activating solution storage pool and small pump, until flooding catalyst, add activating solution by medicine system then, 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 is through inside and outside circulation mixing, activating catalyst; Activate after 1～5 hour, the activating solution of about 50% volume is partly entered the repeated use of activating solution storage pool, all the other enter waste water tank, by Wastewater Pretreatment system and demineralizer, reclaim demineralized water and send into sweet-water tank, close baffle plate, start circulating fan, heat pump, condenser, heat exchanger, 40～120 ℃ of control wind-warm syndrome, 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; 40 ℃ of control wind-warm syndrome; The composition of described activating solution: oxalic acid 50mg/L, ammonium metavanadate 50mmol/L, ammonium metatungstate 20mmol/L; The formic acid 1%wt that is used for the control pH value.
The composition of described cleaning agent is polyacrylic acid 500mg/L, NPE 700mg/L, AEO 1000mg/L, sodium ascorbate 500mg/L; 120 ℃ of control wind-warm syndrome; The composition of described activating solution: oxalic acid 500mg/L, ammonium metavanadate 120mmol/L, ammonium metatungstate 100mmol/L; The citric acid 10%wt that is used for the control pH value.
The composition of described cleaning agent is polyacrylic acid 200mg/L, NPE 400mg/L, AEO 600mg/L, sodium ascorbate 60mg/L; 80 ℃ of control wind-warm syndrome; The composition of described activating solution: oxalic acid 300mg/L, ammonium metavanadate 80mmol/L, ammonium metatungstate 60mmol/L.The formic acid 5%wt that is used for the control pH value.
A kind of system and device for the catalyst for denitrating flue gas regeneration technology, it comprises a chemicals dosing plant, a cleaning activation pond that is connected with chemicals dosing plant, in described cleaning activation pond, be provided with a plurality of aeration tubes, at the other baffle plate that is provided with of aeration tube, be provided with drainpipe in the bottom of cleaning the activation pond; The water circulating pump in-line filter is connected to the exit of drainpipe by pipeline one end, and the other end feeds the top of cleaning the activation pond.
On described cleaning activation pond, also connected one by condenser, circulating fan, the drier that heat pump and heat exchanger constitute.
It also comprises a regenerative wastewater treatment system, described regenerative wastewater is handled the drainpipe place that adopts membrane treatment process to be included in cleaning activation pond and is connected with membrane treatment appts in turn by pipeline, waste water tank, described regenerative wastewater treatment system feeds 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 at described pipeline for the conveying liquid that connects.
Between described membrane treatment appts and waste water tank, also connect a Wastewater Pretreatment case by pipeline.
The present invention concentrates on technologies such as the immersion of catalyst regeneration, cleaning, activation, reparation, drying and finishes in one or two container, reduce the regenerative system volume significantly, regenerative process and operating procedure have been simplified, make in the conventional regeneration method that catalyst lifting step is reduced to 1 time or 2 times more than 5 times, cleaning fluid can also be kept and activating solution is limpid, blowing ash and acid pickling step and be a cleaning step in the conventional regeneration technology, simplified technology, improved cleaning and activation effect.The cleaning fluid that adopts is formed the iron ion in can more effective removal denitrating catalyst, reduces SO in the denitrating catalyst use
2Oxygenation efficiency.The drying process of catalyst adopts heat pump technology and gas circulation technology, cuts down the consumption of energy 50%, and avoids the combustion gas contaminated air.Regenerative wastewater is handled and is adopted membrane treatment process, handles water outlet (demineralized water) and recycles and reuses, and reduces water consumption and quantity of wastewater effluent.
Description of drawings:
Fig. 1 is system and device schematic diagram of the present invention
Fig. 2 is the structural representation in cleaning activation of the present invention pond
Fig. 3 is the C-C cutaway view of Fig. 2 of the present invention
Fig. 4 is the structural representation of drying device of the present invention
The specific embodiment:
Below in conjunction with accompanying drawing 1, Fig. 2 and Fig. 3, the present invention is further detailed:
Embodiment 1:
In the present embodiment, technology of the present invention comprises following step:
A: the cleaning of denitrating catalyst: the denitrating catalyst 2 of at first need regenerating is packed into and is cleaned in the activation pond 1, replenish demineralized water by sweet-water tank 27, cleaning fluid storage pool 17 and small pump 24 to cleaning in the activation pond 1 then, flood catalyst 2 until salt solution, employed brine strength is:; Add cleaning agent successively by medicine system 12, the composition of cleaning agent: polyacrylic acid 50mg/L, NPE 50mg/L, AEO 200mg/L, sodium ascorbate 100mg/L starts circulating fan 9, aeration tube 3, water circulating pump 6 and filter 7 when adding cleaning agent, cleaning fluid circulates under the effect of aeration gas, mix the medicament in the cleaning fluid, add formic acid 1%wt at last again, control cleaning fluid pH=2～5; Scavenging period 1～5 hour; Through above-mentioned cleaning process, the iron ion in can more effective removal denitrating catalyst reduces SO in the denitrating catalyst use
2Oxygenation efficiency.The cleaning fluid of about 50% volume is partly entered cleaning fluid storage pool 17 reuse, all the other enter waste water tank 15, by Wastewater Pretreatment system 14 and desalting system 13, reclaim demineralized water and send into sweet-water tank 27; Close baffle plate 5 then, start circulating fan 9, heat pump 10, condenser 8, heat exchanger 11,40～120 ℃ of control wind-warm syndrome, dry 2～5 hours; The drying of catalyst adopts heat pump technology and gas circulation technology, capable of reducing energy consumption 50% among the present invention.
Wastewater Pretreatment system main purpose is in order to regulate the pH value of waste water, and removes some to strong oxidation materials such as the with serious pollution chlorine of composite membrane in next step film processing system.For example, contain a large amount of acid wash liquids in the waste water, at this time can in Wastewater Pretreatment, add a certain amount of alkali lye (as NaOH) thus the pH that regulates waste water adapts to next step film separation system to proper range, and can not cause the aging of short time inner membrance excessively by force because of acidity, even decompose.Device start order and technological parameter in the above-mentioned technological process are as follows:
The activation of B, denitrating catalyst: replenish demineralized water to cleaning activation pond 1 by sweet-water tank 27, activating solution storage pool 18 and small pump 24, until flooding catalyst 2, add activating solution by medicine system 12 then, 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 is through inside and outside circulation mixing, activating catalyst; Activate after 1～5 hour, the activating solution of about 50% volume is partly entered 18 repeated uses of activating solution storage pool, all the other enter waste water tank 15, by Wastewater Pretreatment system 14 and demineralizer 13, reclaim demineralized water and send into sweet-water tank 27, can realize processing and the repeated use of waste water like this, reduce environmental pollution, also rationally utilize waste water resource.After activation procedure is finished and activating solution disposed, close baffle plate 5, start circulating fan 9, heat pump 10, condenser 8, heat exchanger 11,40 ℃ of control wind-warm syndrome dry 2～5 hours, are finished the drying of regenerated catalyst.
In the present embodiment, technology of the present invention is to finish in following device: it comprises a chemicals dosing plant, a cleaning activation pond 1 that is connected with chemicals dosing plant, in described cleaning activation pond, be provided with a plurality of aeration tubes 3, at the other baffle plate 5 that is provided with of aeration tube, be provided with drainpipe 4 in the bottom of cleaning the activation pond; Water circulating pump 6 in-line filters 7 are connected to the exit of drainpipe 4 by pipeline one end, and the other end feeds the top of cleaning the activation pond.On described cleaning activation pond, also connected one by condenser 8, circulating fan 9, the drier that heat pump 10 and heat exchanger 11 constitute.
It also comprises a regenerative wastewater treatment system, described regenerative wastewater is handled drainpipe 4 places that adopt membrane treatment process to be included in cleaning activation pond and is connected with membrane treatment appts 13 in turn by pipeline, waste water tank 15, described regenerative wastewater treatment system feeds 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 at described pipeline for the conveying liquid that connects.
Between described membrane treatment appts 13 and waste water tank 15, also connect a Wastewater Pretreatment case 14 by pipeline.
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; 120 ℃ of control wind-warm syndrome; The composition of described activating solution: oxalic acid 500mg/L, ammonium metavanadate 120mmol/L, ammonium metatungstate 100mmol/L; The citric acid 10%wt that is used for the control pH value.
Other parts and the embodiment 1 of present embodiment are identical.
Embodiment 3:
The composition of described cleaning agent is polyacrylic acid 200mg/L in the present embodiment, NPE 400mg/L, AEO 600mg/L, sodium ascorbate 60mg/L; 80 ℃ of control wind-warm syndrome; The composition of described activating solution: oxalic acid 300mg/L, ammonium metavanadate 80mmol/L, ammonium metatungstate 60mmol/L.The formic acid 5%wt that is used for the control pH value.
Other parts and the embodiment 1 of present embodiment are identical.
Claims (8)
1. catalyst for denitrating flue gas regeneration technology, it comprises following processing step:
The cleaning of A, denitrating catalyst: the denitrating catalyst (2) of at first need regenerating is packed into and is cleaned in the activation pond (1), replenish demineralized water by sweet-water tank (27), cleaning fluid storage pool (17) and small pump (24) in the activation pond (1) to cleaning then, flood catalyst (2) until salt solution, employed brine strength is:; Add cleaning agent 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, start circulating fan (9), aeration tube (3), water circulating pump (6) and filter (7) when adding cleaning agent, cleaning fluid circulates under the effect of aeration gas, mix the medicament in the cleaning fluid, add formic acid or citric acid 1～10%wt at last again, control cleaning fluid pH=2～5; Scavenging period 1～5 hour; The cleaning fluid of about 50% volume is partly entered cleaning fluid storage pool (17) reuse, all the other enter waste water tank 15, by Waste Water Treatment (14) and desalting system (13), reclaim demineralized water and send into sweet-water tank (27); Close baffle plate (5), start circulating fan (9), heat pump (10), condenser (8), heat exchanger (11), 40～120 ℃ of control wind-warm syndrome, dry 2～5 hours;
The activation of B, denitrating catalyst: replenish demineralized water to cleaning activation pond (1) by sweet-water tank (27), activating solution storage pool (18) and small pump (24), until flooding catalyst (2), add activating solution by medicine system (12) then, 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 is through inside and outside circulation mixing, activating catalyst; Activate after 1～5 hour, the activating solution of about 50% volume is partly entered activating solution storage pool (18) repeated use, all the other enter waste water tank (15), by Wastewater Pretreatment system (14) and demineralizer (13), reclaim demineralized water and send into sweet-water tank (27), close baffle plate (5), start circulating fan (9), heat pump (10), condenser (8), heat exchanger (11), 40～120 ℃ of control wind-warm syndrome, dry 2～5 hours.
2. the catalyst for denitrating flue gas regeneration technology 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; 40 ℃ of control wind-warm syndrome; The composition of described activating solution: oxalic acid 50mg/L, ammonium metavanadate 50mmol/L, ammonium metatungstate 20mmol/L; The formic acid 1%wt that is used for the control pH value.
3. the catalyst for denitrating flue gas regeneration technology described in claim 1, the composition that it is characterized in that described cleaning agent is polyacrylic acid 500mg/L, NPE 700mg/L, AEO 1000mg/L, sodium ascorbate 500mg/L; 120 ℃ of control wind-warm syndrome; The composition of described activating solution: oxalic acid 500mg/L, ammonium metavanadate 120mmol/L, ammonium metatungstate 100mmol/L; The citric acid 10%wt that is used for the control pH value.
4. the catalyst for denitrating flue gas regeneration technology described in claim 1, the composition that it is characterized in that described cleaning agent is polyacrylic acid 200mg/L, NPE 400mg/L, AEO 600mg/L, sodium ascorbate 60mg/L; 80 ℃ of control wind-warm syndrome; The composition of described activating solution: oxalic acid 300mg/L, ammonium metavanadate 80mmol/L, ammonium metatungstate 60mmol/L.The formic acid 5%wt that is used for the control pH value.
5. system and device that is used for the catalyst for denitrating flue gas regeneration technology, it is characterized in that it comprises a chemicals dosing plant, a cleaning activation pond (1) that is connected with chemicals dosing plant, in the pool wall of described cleaning activation pond, be provided with a plurality of aeration tubes (3), at the other baffle plate (5) that is provided with of aeration tube, be provided with drainpipe (4) in the bottom of cleaning the activation pond; Water circulating pump (6) in-line filter (7) is connected to the exit of drainpipe (4) by pipeline one end, and the other end feeds the top of cleaning the activation pond.
6. the system and device that is used for the catalyst for denitrating flue gas regeneration technology described in claim 5, it is characterized in that on described cleaning activation pond, also having connected one by condenser (8), circulating fan (9), the drier that heat pump (10) and heat exchanger (11) constitute.
7. the system and device that is used for the catalyst for denitrating flue gas regeneration technology described in claim 5, it is characterized in that it also comprises a regenerative wastewater treatment system, described regenerative wastewater is handled the drainpipe (4) that adopts membrane treatment process to be included in cleaning activation pond and is located to be connected with membrane treatment appts (13) in turn by pipeline, waste water tank (15), described regenerative wastewater treatment system feeds 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 at described pipeline for the conveying liquid that connects.
8. the system and device that is used for the catalyst for denitrating flue gas regeneration technology described in claim 7 is characterized in that also connecting a Wastewater Pretreatment case (14) by pipeline between described membrane treatment appts (13) and waste water tank (15).
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Cited By (7)
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| CN103508491A (en) * | 2013-09-23 | 2014-01-15 | 宜兴市宜刚环保工程材料有限公司 | Method for regeneration and resource utilization of waste honeycombed denitrification catalyst |
| 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 |
| CN104826494A (en) * | 2015-04-17 | 2015-08-12 | 成都易态科技有限公司 | Regeneration method for flue gas SCR de-nitration catalyst filtering element |
| CN106215560A (en) * | 2016-08-31 | 2016-12-14 | 苏州贝捷环保设备有限公司 | Coal-fired flue-gas processes with dust chemical catalysis parallel processors |
| CN107043656A (en) * | 2017-04-24 | 2017-08-15 | 中国天辰工程有限公司 | A kind of dispersant and wash mill for being used to wash sial phosphorus molecular sieve |
| CN107570128A (en) * | 2016-07-05 | 2018-01-12 | 江苏中科睿赛污染控制工程有限公司 | A kind of industrial waste Al2O3Bead regenerative system and renovation process |
| 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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| CN103508491A (en) * | 2013-09-23 | 2014-01-15 | 宜兴市宜刚环保工程材料有限公司 | Method for regeneration and resource utilization of waste honeycombed denitrification catalyst |
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| 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 |
| CN104826494A (en) * | 2015-04-17 | 2015-08-12 | 成都易态科技有限公司 | Regeneration method for flue gas SCR de-nitration catalyst filtering element |
| CN107570128A (en) * | 2016-07-05 | 2018-01-12 | 江苏中科睿赛污染控制工程有限公司 | A kind of industrial waste Al2O3Bead regenerative system and renovation process |
| 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 |
| CN106215560A (en) * | 2016-08-31 | 2016-12-14 | 苏州贝捷环保设备有限公司 | Coal-fired flue-gas processes with dust chemical catalysis parallel processors |
| 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 |
| CN107043656A (en) * | 2017-04-24 | 2017-08-15 | 中国天辰工程有限公司 | A kind of dispersant and wash mill for being used to wash 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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