CN202860549U - On-line cleaning process system and on-line activating process system of flue gas SCR (Selective Catalytic Reduction) denitration catalyst - Google Patents
On-line cleaning process system and on-line activating process system of flue gas SCR (Selective Catalytic Reduction) denitration catalyst Download PDFInfo
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- CN202860549U CN202860549U CN 201220504636 CN201220504636U CN202860549U CN 202860549 U CN202860549 U CN 202860549U CN 201220504636 CN201220504636 CN 201220504636 CN 201220504636 U CN201220504636 U CN 201220504636U CN 202860549 U CN202860549 U CN 202860549U
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Abstract
The utility model discloses an on-line cleaning process system and an on-line activating process system of a flue gas SCR (Selective Catalytic Reduction) denitration catalyst. In the on-line cleaning process system, a denitration reaction tower is taken as a main body; the denitration reaction tower is internally provided with a steam soot blower; the steam inlet pipeline is connected to a cleaning fluid pool through a first transmission pipeline; a tower bottom outlet is connected to a sewage pool through a second transmission pipeline; and the first transmission pipeline and the second transmission pipeline are provided with valves. The on-line activating process system mainly comprises an activating fluid pool and the on-line cleaning process system, wherein the outlet and inlet of the activating fluid pool are respectively communicated with the first transmission pipeline and the second transmission pipeline through connecting pipelines; and the connecting pipelines are both provided with the valves. The on-line activating process system can be connected to a flue gas heating system. The on-line cleaning process system and the on-line activating process system which are disclosed by the utility model have the advantages that operation is easy and convenient, process cost is low, reliability is good, space occupation is small, reconstruction compatibility is good, activation effect is good, and the like.
Description
Technical field
The utility model is directly involved in the activating technology field of industrial combustion flue gas SCR denitration catalyst, is specially adapted to that catalyst need not from Benitration reactor to take out, the personnel of need not enter the online activating technology of the catalyst that operates in Benitration reactor field.
Background technology
Along with the appearance of " The Law of the People's Republic of China on the Prevention and Control of Atmospheric Pollution ", " construction project environmental protection management rules " and a series of laws and regulations such as " fossil-fuel power plant atmospheric pollutant emission standards ", China begins progressively to strengthen the control dynamics to Air Pollutant Emission." national environmental protection Eleventh Five-Year Plan " explicitly points out: " carrying on nitrogen oxide control research; accelerate nitrogen oxide control technology exploitation and demonstration "; " thermal power plant's nitrogen oxide Prevention Technique policy " of the new promulgation of China proposes to increase thermal power plant's nitrogen oxide and reduces discharging index during " 12 ", and domestic denitration project construction and transformation are proposed Secretary.
At present, mainly there is following problem in the fire coal boiler fume SCR of domestic operation (full name is selective catalytic reduction) denitrating system: (1) denitrating catalyst is expensive, and catalyst formulation and manufacturing technology thereof are rare; Catalyst formulation and manufacturing technology thereof that domestic flue gas SCR denitration system uses almost all rely on external import, and installation fee accounts for 1/3～1/2 of SCR denitrating system gross investment; (2) in SCR Benitration reactor when operation,, the catalyst that is exposed in the ash-laden gas is easily stopped up by flying dust, and poisons with flue gas and fly ash particle generation chemical reaction, catalyst is lost activity, thereby seriously reduce denitration efficiency.This shows, but the service life of the activation extending catalyst of catalyst, the operating cost of greatly saving boiler flue gas denitration system, thus the apply tool of flue gas SCR denitration technology in China is of great significance.
At present, the activation method of flue gas SCR denitration catalyst generally is divided into online activation method and off-line activation method.The off-line activation method is that decaying catalyst is taken out in Benitration reactor, is transported to special producer and cleans activation processing.Online activation method can be divided into two kinds: a kind of is manually to enter Benitration reactor to carry out activation act, namely during the boiler overhaul, by manually entering reactor catalyst is cleaned activation act after temperature drops to proper level in the Benitration reactor, the method had not only increased cost of labor simultaneously but also had been subjected to the restriction of operating environment, working time is longer, and efficient is lower; Another kind is to utilize the boiler unit underload period or utilize during the boiler maintenance, and the temporary close flue gas denitrification system is not withdrawn at catalyst on the basis of active service Benitration reactor, carries out the online activating technology of Adjustment operation by each gas baffle, valve.
At present, the online activating technology of flue gas SCR denitration catalyst also is in the initial stage of fumbling, rarely has report both at home and abroad.
The utility model content
The technical problems to be solved in the utility model is to overcome the deficiencies in the prior art, provide a kind of simple in structure, easy to operate, process costs is low, good reliability, space hold are little, transform the flue gas SCR denitration catalyst on-line cleaning process system compatible good, that activation effect is good and online activating process system.
For solving the problems of the technologies described above, the technical scheme that the utility model proposes is a kind of flue gas SCR denitration catalyst on-line cleaning process system, described on-line cleaning process system is as main body take the denitration reaction tower, be provided with steam sootblower in the described denitration reaction tower, the steam inlet pipeline of described steam sootblower is connected to one by the first conveyance conduit and cleans liquid pool, and the outlet at bottom of described denitration reaction tower is connected to a cesspool by the second conveyance conduit; Be equiped with valve on described the first conveyance conduit and the second conveyance conduit.
In the above-mentioned flue gas SCR denitration catalyst on-line cleaning process system, also preferably be equiped with water pump and flowmeter (being particularly preferably water pump and flowmeter with antiseptic property) on described the first conveyance conduit.
In the above-mentioned flue gas SCR denitration catalyst on-line cleaning process system, preferably tell the import department that a loop branch pipe is communicated to described cleaning liquid pool on the first conveyance conduit between described water pump and the flowmeter, this loop branch pipe is provided with valve.
Above-mentioned flue gas SCR denitration catalyst on-line cleaning process system, described cesspool preferably is connected by the discharge outlet of connecting pipe with described cleaning liquid pool.
As a total technical conceive, the utility model also provides the online activating process of a kind of flue gas SCR denitration catalyst system, described online activating process system mainly is comprised of activation liquid pool and above-mentioned on-line cleaning process system, the outlet of described activation liquid pool is connected with described the first conveyance conduit by connecting pipe, the import of described activation liquid pool is connected with described the second conveyance conduit by connecting pipe, all is equiped with valve on the described connecting pipe.
In the above-mentioned online activating process of the flue gas SCR denitration catalyst system, preferably be provided with heater and agitating device in the described activation liquid pool.This heater preferably utilizes power plant's hot water or vapours to carry out the heater of indirect.
In the above-mentioned online activating process of the flue gas SCR denitration catalyst system, preferably tell the import department that a loop branch pipe is communicated to described activation liquid pool on described the first conveyance conduit, this loop branch pipe is provided with valve.
In the above-mentioned online activating process of the flue gas SCR denitration catalyst system, described online activating process system also comprises preferably flue gas heating system, described flue gas heating system comprises the reaction tower inlet flue duct that is communicated with described denitration reaction tower air inlet and the reaction tower exhaust pass that is communicated with described denitration reaction tower gas outlet, the air inlet of described reaction tower inlet flue duct is communicated with the boiler smoke pipeline, and described reaction tower inlet flue duct is communicated with by wind pipeline of import bypass duct and boiler or with electric cleaner outlet flue in addition.
In the above-mentioned online activating process of the flue gas SCR denitration catalyst system, the steam inlet pipeline of described steam sootblower preferably is communicated with by dry wind pipeline of wind conveyance conduit and described boiler or with described electric cleaner outlet flue.
In the above-mentioned online activating process of the flue gas SCR denitration catalyst system, preferably be equiped with economizer in the described boiler smoke pipeline, described import bypass duct is communicated with the boiler smoke pipeline by the economizer bypass duct; Be provided with valve in the described economizer bypass duct.
The above-mentioned online activating process of flue gas SCR denitration catalyst system, described boiler smoke pipeline preferably is connected with described reaction tower exhaust pass by the reaction tower bypass duct, is provided with valve in the described reaction tower bypass duct.
Compared with prior art, the utility model has the advantage of:
(1) on-line cleaning activation, simple and convenient.Traditional catalyst activation Technology Need takes out catalyst and cleans, activates from the denitration reaction tower, and on-line cleaning of the present utility model, activating process system can be in the situation that (namely temporarily stop the flue gas denitrification system operation) during boiler performing low-load running of machine set or the boiler maintenance, directly catalyst is cleaned and activating and regenerating, need not the staff and enter the artificial catalyst that takes out in the denitration reaction tower, whole cleaning, activation act are simple, convenient, and efficient and security all are improved.
(2) activating cost reduces, and catalyst life prolongs.On-line cleaning of the present utility model, activating process system are for carrying out online, taking-up in the catalyst-free tradition activation method, transportation and the operation link such as installation again, can effectively avoid the mechanical loss that causes in the catalyst activation process, service life of extending catalyst greatly, simultaneously, also can make the activating cost of catalyst reduce more than 1/3～2/3.
(3) transformation is compatible good.On-line cleaning of the present utility model, activating process system can directly carry out Compatibility Transformation on the basis of existing domestic Power Plant equipment, the steam inlet pipeline of the rake soot blower of for example commonly using in the power plant can be used as the spray piping of cleaning fluid, activating solution, and activating solution adds thermal medium can use power plant's hot water or vapours indirect; Deionized water can replace with power plant's demineralized water; The flue system transformation is simple, only need in active service denitrating flue gas reaction system extension flue gas pipeline or gas baffle door and get final product, therefore, the flue gas denitrification system of catalyst on-line cleaning of the present utility model, activating process system and active service boiler unit has compatible preferably.
(4) space hold is little.The spatial volume of on-line cleaning of the present utility model, the used activation liquid pool of activating process system, cesspool, cleaning liquid pool is directly proportional with the activating solution flow, also relevant circulation timei with activating solution, can be positioned on the ground, also can place on the outside corridor of rake steam sootblower, take up an area Spatial General 6 R little.
In sum, flue gas SCR denitration catalyst on-line cleaning of the present utility model, activating process system can take full advantage of the plumbing installation of active service denitrating flue gas reaction system, just dress and operating cost are little, equipment investment is little, reliable, operating cost is low, and the catalyst activation is effective, applicable to the denitrating catalyst activating and regenerating of the old and new's boiler of power plant unit.
Description of drawings
Fig. 1 is the structural representation of flue gas SCR denitration catalyst on-line cleaning process system among the utility model embodiment 1.
Fig. 2 is the structural representation of the online activating process of flue gas SCR denitration catalyst system among the utility model embodiment 2.
Fig. 3 is the structural representation of flue gas heating system in the online activating process system of the utility model embodiment 3.
Fig. 4 is the structural representation of the online activating process of the flue gas SCR denitration catalyst system after improving among the utility model embodiment 3.
Marginal data:
1, reaction tower exhaust pass; 2, boiler smoke pipeline; 3, reaction tower bypass duct; 4, reaction tower inlet flue duct; 5, import bypass duct; 6, flue gas rectifier; 7, steam sootblower; 8, catalyst layer; 9, denitration reaction tower; 10, heater; 11, outlet damper door; 12, air preheater; 13, import baffle door; 14, the first conveyance conduit; 15, reaction tower bypass gas baffle door; 16, flowmeter; 17, loop branch pipe; 18, activating tank circulating valve; 19, water pump; 20, agitating device; 21, activation liquid pool; 22, vapours import; 23, vapours outlet; 24, clean liquid pool; 25, cesspool; 26, blowoff valve; 27, the second conveyance conduit; 28, activating tank inlet valve; 29, activating tank outlet valve; 30, clear water reserviors outlet valve; 31, wind pipeline of boiler; 32, economizer; 33, economizer by-pass damper door; 34, economizer bypass duct; 35, steam inlet pipeline; 36, dry wind conveyance conduit.
The specific embodiment
Below in conjunction with Figure of description and concrete preferred embodiment the utility model is further described, but does not therefore limit protection domain of the present utility model.
Embodiment 1:
A kind of flue gas SCR denitration catalyst on-line cleaning process system that can be used for the power plant as shown in Figure 1, this on-line cleaning process system is as main body take denitration reaction tower 9, be provided with steam sootblower 7 (rake steam sootblower) in the denitration reaction tower 9, the steam inlet pipeline 35 of steam sootblower 7 is connected to one by the first conveyance conduit 14 and cleans liquid pool 24 (cleaning fluid wherein can be pure water or deionized water), and the outlet at bottom of denitration reaction tower 9 is connected to a cesspool 25 by the second conveyance conduit 27.Also be equiped with water pump 19 and flowmeter 16 (generally getting final product with suspended body flowmeter) on the first conveyance conduit 14.On the outlet of cleaning liquid pool 24 and the first conveyance conduit 14 between the water pump 19 clear water reserviors outlet valve 30 is housed, tell a loop branch pipe 17 on the first conveyance conduit 14 between water pump 19 and the flowmeter 16 and be communicated to the import department of cleaning liquid pool 24, loop branch pipe 17 is provided with circulating valve; The first conveyance conduit 14 between flowmeter 16 and the steam inlet pipeline 35 is provided with the steam sootblower inlet valve.On the second conveyance conduit 27 the cesspool inlet valve is housed.Cesspool 25 is connected with the discharge outlet of cleaning liquid pool 24 by connecting pipe, is provided with equally valve on this connecting pipe.
The flue gas SCR denitration catalyst on-line cleaning process system of the present embodiment is particularly suitable for being applied in the power plant of active service, at this moment, the cleaning fluid spray piping of on-line cleaning process system can use the steam inlet pipeline 35 of the rake soot blower of active service power plant to replace, the cleaning fluid that cleans in the liquid pool 24 then preferably replaces with power plant's demineralized water, with the organic combination of realizing system architecture, gather materials on the spot and resource recycling.
The operation principle of the flue gas SCR denitration catalyst on-line cleaning process system of the present embodiment is: open clear water reserviors outlet valve 30 and cesspool inlet valve, start water pump 19, by steam regulation soot blower inlet valve and circulating valve etc., utilize flowmeter 16 that the cleaning fluid of carrying in the first conveyance conduit 14 is adjusted to desired flow, make the cleaning fluid that cleans in the liquid pool 24 pass through the conveying of the first conveyance conduit 14, sprayed fully equably on the flue gas SCR denitration catalyst layer 8 in the denitration reaction tower 9 by steam sootblower 7 at last, and take away the dust that sticks to (or being blocked in catalyst layer 8 ducts) on the catalyst layer 8, ammonium sulfate (comprises NH
4HSO
4Or (NH
4)
2SO
4), the material such as alkali, alkaline-earth metal and its esters; Sewage after the flushing is delivered to cesspool 25 by the second conveyance conduit 27; Dust, the mud of precipitation in the cesspool 25, be dissolved in the catalyst surface salt etc. that salt in the cleaning fluid and part are insoluble to cleaning fluid, be discharged in the ashpit of power plant through the blowoff valve 26 of cesspool 25; The scavenging period of the present embodiment on-line cleaning process system and degree of cleaning can by checking that the plaster situation is judged in the cesspool, if its quality no longer changes or changes seldom, then can stop to clean.
Embodiment 2:
A kind of online activating process of flue gas SCR denitration catalyst system as shown in Figure 2, this online activating process system mainly is comprised of the on-line cleaning process system in activation liquid pool 21 and above-described embodiment 1, the outlet of activation liquid pool 21 is connected with the first conveyance conduit 14 by connecting pipe, and this connecting pipe is provided with activating tank outlet valve 29; The import of activation liquid pool 21 is connected with the second conveyance conduit 27 by connecting pipe, and this connecting pipe is provided with activating tank inlet valve 28.Also be provided with heater 10 and agitating device 20 in the activation liquid pool 21, this heater 10 is to utilize power plant's vapours to carry out the heater of indirect, is provided with vapours import 22 and vapours outlet 23.The loop branch pipe 17 of above-mentioned on-line cleaning process system is communicated to import department's (perhaps telling in addition the import department that a loop branch pipe 17 is communicated to activation liquid pool 21 on the first conveyance conduit 14) of activation liquid pool 21 by another arm, this arm is provided with activating tank circulating valve 18.
The online activating process of the flue gas SCR denitration catalyst system of the present embodiment not only can be used for the on-line cleaning of denitration reaction tower 9 catalyst layers 8, and can be used for the online activation of catalyst layer 8 interior decaying catalysts.Because the online activating process system in the present embodiment mainly is that on-line cleaning process system in above-described embodiment 1 is as main body, accordingly, the conveyance conduit of its activating solution has shared the first conveyance conduit 14 in the on-line cleaning process system, the spray piping of activating solution has then shared the rake steam sootblower 7 that original power-plant flue gas denitration is used equally, at utmost to reduce acquiring of equipment investment and additional line; In addition, consider that the activating solution that catalyst layer 8 uses in the present embodiment has corrosivity, therefore, water pump 19 and flowmeter 16 in the on-line cleaning process system all need be with anti-corrosion function.
The operation principle of the online activating process of the flue gas SCR denitration catalyst system of the present embodiment is: the cesspool inlet valve of closing first cesspool 25, close the clear water reserviors outlet valve 30 that cleans liquid pool 24, then open activating tank inlet valve 28 and the activating tank outlet valve 29 of activation liquid pool 21, start the water pump 19 with anti-corrosion function, utilize flowmeter 16 to regulate activating tank circulating valve 18, make the activating solution in the first conveyance conduit 14 reach certain flow and flow velocity, so that the complete surface of covering catalyst layer 8, the activating solution that then will activate in the liquid pool 21 is transported to rake steam sootblower 7, and evenly spray washes and takes away salts such as being attached on catalyst layer 8 lip-deep dusts and sulfate to catalyst layer 8; The drip washing catalyst layer is after 8 a period of times, close activating tank inlet valve 28 and activating tank outlet valve 29, and stop the operation of water pump 19, the spray flux of activating solution and spray time are wanted suitably, should guarantee that activating solution can be sprayed on the decaying catalyst fully equably, will avoid simultaneously causing by spray catalyst activity composition V because excessively spraying
2O
5A large amount of losses and the mechanical strength of catalyst be subject to negative influence.
Embodiment 3:
A kind of online activating process of flue gas SCR denitration catalyst of the present utility model system as shown in Figure 4, this online activating process system also includes flue gas heating system shown in Figure 3, this flue gas heating system comprises the reaction tower inlet flue duct 4 that is communicated with denitration reaction tower 9 air inlets and the reaction tower exhaust pass 1 that is communicated with denitration reaction tower 9 gas outlets, be provided with import baffle door 13 in the reaction tower inlet flue duct 4, be provided with outlet damper door 11 in the reaction tower exhaust pass 1; The air inlet of reaction tower inlet flue duct 4 is communicated with the boiler smoke pipeline, and reaction tower inlet flue duct 4 is communicated with by wind pipeline 31 of import bypass duct 5 and boiler (or export flue with electric cleaner) in addition; Wind pipeline 31 of boiler is provided with baffle door.The steam inlet pipeline 35 of steam sootblower 7 is communicated with by dry wind pipeline 31 of a wind conveyance conduit 36 and boiler (or electric cleaner outlet flue).Be equiped with economizer 32 in the boiler smoke pipeline, import bypass duct 5 is communicated with the boiler smoke pipeline by economizer bypass duct 34; Be provided with economizer by-pass damper door 33 in the economizer bypass duct 34.The boiler smoke pipeline is connected with reaction tower exhaust pass 1 by reaction tower bypass duct 3 in addition, is provided with reaction tower bypass gas baffle door 15 in the reaction tower bypass duct 3.
Catalyst behind the activated liquid spray washing, its adsorption has the active component presoma (generally to contain the active component presoma in the regeneration activating liquid, as ammonium metavanadate, ammonium metatungstate or ammonium paratungstate or ammonium tungstate, metamolybdic acid ammonium etc. are arranged) and a certain amount of moisture, need to drain or dry it, the moisture of its outer surface of heating evaporation, inner surface.Optimize by the online activating process system at embodiment 2 and to set up above-mentioned flue gas heating system shown in Figure 3, the online activating process system of the present embodiment is possessed simultaneously catalyst is carried out dry function.
When the catalyst after adopting above-mentioned flue gas heating system to the activating solution spray carries out drying, its operation principle is: catalyst is dry need to use the hot flue gas comparatively pure, that dust-laden is less, and the flue gas (or electric cleaner outlet flue gas) of wind pipeline of boiler 31 output not only flue-gas temperature is higher, and dust-laden is few, gas temperature can be regulated, and meets the dry gas needs; At this moment, close first import baffle door 13, outlet damper door 11 and economizer by-pass damper door 33, import baffle door 13, outlet damper door 11 and 33 at economizer by-pass damper door can stop boiler smoke during drying to enter denitration reaction tower 9, because the dustiness of boiler smoke is higher, can pollute undried catalyst still; Open simultaneously in wind pipeline 31 of boiler the valve that arranges, allow the gas of wind pipeline of boiler 31 outputs then directly enter the catalyst of 9 pairs of activating solutions of denitration reaction tower after wetting by reaction tower inlet flue duct 4 and carry out drying processing; Dry processing can be to carry out stage by stage, note controlling the programming rate of catalyst when dry, avoid heating up too fast, moisture is subjected to the thermal evaporation expansion too fast in the catalyst internal void because the too fast meeting that heats up causes, the structural deterioration of catalyst internal void, the catalyst activity surface area reduces even sintering; The temperature of a wind of boiler that generally passes into is controlled between 60 ℃～120 ℃.
Catalyst after super-dry is processed also needs to carry out roasting, makes active component presoma in the activating solution that reaction as shown in the formula (1)～(3) occur:
Above-mentioned chemical reaction can generate active component V
2O
5, V
2O
5Homogeneous precipitation is attached on the surface of catalyst, thus replenish decaying catalyst Yin Gaowen and vapor away or poison, abrasion and the active component of loss.At catalyst surface chemical reaction can occur also generate WO simultaneously
3And MoO
3Deng the required active component of catalyst, the two also can be evenly distributed on the surface of catalyst.Therefore, when the configuration activating solution, note controlling NH
4VO
3And the share of ammonium metatungstate (or metamolybdic acid ammonium), make the V in the catalyst behind the calcination for activation
2O
5Wt% is between 1%～1.5%, and WO
3Wt%≤10%, MoO
3About wt%≤6%.
Optimize by the online activating process system at embodiment 2 and to set up above-mentioned flue gas heating system shown in Figure 3, can make the online activating process system in the present embodiment possess simultaneously the function of catalyst being carried out roasting.
When adopting above-mentioned flue gas heating system that dried catalyst is carried out roasting, its operation principle is: the roasting of catalyst can use boiler smoke to heat, at this moment, close first the valve and the reaction tower bypass gas baffle door 15 that arrange in wind pipeline 31 of boiler, open simultaneously import baffle door 13 and outlet damper door 11, enter into denitration reaction tower 9 after making boiler smoke through boiler smoke pipeline and reaction tower inlet flue duct 4 catalyst is carried out calcination process, with heatable catalyst active component presoma, make it reaction and generate V
2O
5, WO
3, MoO
3The isoreactivity composition, thus raw catalyst replenished because of the active component of the reasons such as sintering, poisoning and abrasion loss, improve the catalyst activity constituent structure and form, improve catalyst efficient; Flue-gas temperature T during roasting in the control denitration reaction tower 9≤450 ℃, generally speaking, temperature requirement when the boiler smoke temperature can satisfy roasting, but when in particular cases the boiler smoke temperature can not satisfy requiring of sintering temperature, then can carry out necessary adjusting.For example, when boiler is in minimum load operation, when may not reach calcination process through the boiler smoke temperature behind the economizer 32 to the requirement of boiler smoke temperature, can open economizer by-pass damper door 33 this moment, the boiler smoke that separating part comes from the boiler smoke pipeline, make it directly to enter in the denitration reaction tower 9 without economizer 32, can regulate the flow that directly enters the boiler smoke in the denitration reaction tower 9 by the aperture of regulating economizer by-pass damper door 33, and and then regulate the flue-gas temperature that enters in the denitration reaction tower 9; When surpassing calcination process to the temperature requirement of boiler smoke through the boiler smoke temperature behind the economizer 32, can close economizer by-pass damper door 33 this moment, open reaction tower bypass gas baffle door 15, directly efflux without denitration reaction tower 9 to shunt a part of boiler smoke, to reduce the boiler smoke temperature.After calcination process was finished, off-response tower bypass gas baffle door 15 and economizer by-pass damper door 33 normally moved the flue gas SCR denitration desulphurization system and get final product.
Online activation principle and the technological process of the online activating process of the flue gas SCR denitration catalyst system in the present embodiment mainly may further comprise the steps:
(1) on-line cleaning of decaying catalyst:
As shown in Figure 4, begin to catalyst clean, when activating, at first need to close import baffle door 13 and outlet damper door 11, make between the whole cleaning of catalyst, pot-life, do not have boiler smoke and enter denitration reaction tower 9, if this moment, boiler was in the underrun state, then the boiler smoke of boiler generation can temporarily directly be delivered to the air preheater 12 at reaction tower exhaust pass 1 rear portion by reaction tower bypass duct 3 (reaction tower bypass gas baffle door 15 is opened) without the denitration reaction tower;
Then, open the cesspool inlet valve of cesspool 25, open clear water reserviors outlet valve 30, start water pump 19, regulate the circulating valve of establishing on the loop branch pipe 17, utilize flowmeter 16 to regulate cleaning fluid to desired flow, make the cleaning fluid that cleans in the liquid pool 24 pass through the conveying of the first conveyance conduit 14, sprayed fully equably on the flue gas SCR denitration catalyst layer 8 in the denitration reaction tower 9 by steam sootblower 7 at last, stick to the dust on the catalyst layer 8, ammonium sulfate, alkali, the sewage such as alkaline-earth metal and its esters is rinsed and brings to cesspool 25, sewage is discharged in power plant's ashpit through blowoff valve 26 and processes after cesspool 25 precipitation; In cleaning process, when sludge quality in the sewage no longer changes or change seldom, illustrate that catalyst cleans up, can stop to clean.
(2) activating solution activation operation:
As shown in Figure 4, close the cesspool inlet valve of cesspool 25, close clear water reserviors outlet valve 30, open activating tank inlet valve 28 and activating tank outlet valve 29, start water pump 19, measure, regulate activating tank circulating valve 18 according to flowmeter 16, make the activating solution that activates in the liquid pool 21 pass through the conveying of the first conveyance conduit 14 with certain flow and flow velocity, sprayed fully equably on the flue gas SCR denitration catalyst layer 8 in the denitration reaction tower 9 by steam sootblower 7 at last, wash and take away salts such as being attached on catalyst layer 8 lip-deep dusts and sulfuric acid; Activating solution drip washing catalyst is closed activating tank inlet valve 28 and activating tank outlet valve 29 after a period of time, and stops the operation of water pump 19, prepares to carry out next step catalyst air drying.
(3) catalyst after the activation is dry:
As shown in Figure 4, open first the valve that arranges in wind pipeline 31 of boiler this moment, import baffle door 13 and economizer by-pass damper door 33 are closed, wind of boiler (or electric cleaner outlet flue gas) of wind pipeline of boiler 31 output is directly entered in the denitration reaction tower 9 by import bypass duct 5, reaction tower inlet flue duct 4, carry out drying processing by the rear catalyst after wetting to activating solution of flue gas rectifier 6; Control simultaneously the programming rate of catalyst, avoid heating up too fast, the temperature of the wind of boiler that passes into is controlled between 60 ℃～120 ℃, can open suitable adjusting outlet baffle door 11 this moment, and keep certain drying time.
(4) dry rear catalyst roasting:
As shown in Figure 4, after drying is finished, at first can close valve and reaction tower bypass gas baffle door 15 in wind pipeline 31 of boiler, open simultaneously import baffle door 13 and outlet damper door 11, enter in the denitration reaction tower 9 after making boiler smoke through boiler smoke pipeline 2 and reaction tower inlet flue duct 4, carry out calcination process through 6 pairs of catalyst of flue gas rectifier again, with heatable catalyst active component presoma, make it reaction and generate V
2O
5, WO
3, MoO
3The isoreactivity composition, thus raw catalyst replenished because of the active component of the reasons such as sintering, poisoning and abrasion loss; Flue-gas temperature T during roasting in the control denitration reaction tower 9≤450 ℃, generally speaking, temperature requirement when the boiler smoke temperature can satisfy roasting, but when in particular cases the boiler smoke temperature can not satisfy requiring of sintering temperature, then can carry out necessary adjusting.For example, when boiler is in minimum load operation, when may not reach calcination process through the boiler smoke temperature behind the economizer 32 to the requirement of boiler smoke temperature, can open economizer by-pass damper door 33 this moment, the boiler smoke that separating part comes from boiler smoke pipeline 2, make it directly to enter in the denitration reaction tower 9 without economizer 32, can regulate the flow that directly enters the boiler smoke in the denitration reaction tower 9 by the aperture of regulating economizer by-pass damper door 33, and and then regulate the flue-gas temperature height that enters in the denitration reaction tower 9; Otherwise, when surpassing calcination process to the temperature requirement of boiler smoke through the boiler smoke temperature behind the economizer 32, can close economizer by-pass damper door 33 this moment, and open reaction tower bypass gas baffle door 15, directly efflux without denitration reaction tower 9 to shunt a part of boiler smoke, to reduce the boiler smoke temperature.After calcination process was finished, off-response tower bypass gas baffle door 15 and economizer by-pass damper door 33 normally moved the flue gas SCR denitration desulphurization system and get final product.
Claims (10)
1. flue gas SCR denitration catalyst on-line cleaning process system, described on-line cleaning process system is as main body take the denitration reaction tower, be provided with steam sootblower in the described denitration reaction tower, it is characterized in that: the steam inlet pipeline of described steam sootblower is connected to one by the first conveyance conduit and cleans liquid pool, and the outlet at bottom of described denitration reaction tower is connected to a cesspool by the second conveyance conduit; Be equiped with valve on described the first conveyance conduit and the second conveyance conduit.
2. flue gas SCR denitration catalyst on-line cleaning process system according to claim 1 is characterized in that: also be equiped with water pump and flowmeter on described the first conveyance conduit.
3. flue gas SCR denitration catalyst on-line cleaning process system according to claim 2, it is characterized in that: tell the import department that a loop branch pipe is communicated to described cleaning liquid pool on the first conveyance conduit between described water pump and the flowmeter, this loop branch pipe is provided with valve.
4. the online activating process of flue gas SCR denitration catalyst system, it is characterized in that: described online activating process system mainly is comprised of each described on-line cleaning process system in activation liquid pool and the claim 1～3, the outlet of described activation liquid pool is connected with described the first conveyance conduit by connecting pipe, the import of described activation liquid pool is connected with described the second conveyance conduit by connecting pipe, all is equiped with valve on the described connecting pipe.
5. the online activating process of flue gas SCR denitration catalyst according to claim 4 system is characterized in that: be provided with heater and agitating device in the described activation liquid pool.
6. the online activating process of flue gas SCR denitration catalyst according to claim 4 system, it is characterized in that: tell the import department that a loop branch pipe is communicated to described activation liquid pool on described the first conveyance conduit, this loop branch pipe is provided with valve.
7. the online activating process of each described flue gas SCR denitration catalyst system according to claim 4～6, it is characterized in that: described online activating process system also includes flue gas heating system, described flue gas heating system comprises the reaction tower inlet flue duct that is communicated with described denitration reaction tower air inlet and the reaction tower exhaust pass that is communicated with described denitration reaction tower gas outlet, the air inlet of described reaction tower inlet flue duct is communicated with the boiler smoke pipeline, and described reaction tower inlet flue duct is communicated with by wind pipeline of import bypass duct and boiler or with electric cleaner outlet flue in addition.
8. the online activating process of flue gas SCR denitration catalyst according to claim 7 system is characterized in that: the steam inlet pipeline of described steam sootblower is by dry wind pipeline of wind conveyance conduit and described boiler or export flue with described electric cleaner and be communicated with.
9. the online activating process of flue gas SCR denitration catalyst according to claim 7 system is characterized in that: be equiped with economizer in the described boiler smoke pipeline, described import bypass duct is communicated with the boiler smoke pipeline by the economizer bypass duct; Be provided with valve in the described economizer bypass duct.
10. the online activating process of flue gas SCR denitration catalyst according to claim 7 system, it is characterized in that: described boiler smoke pipeline is connected with described reaction tower exhaust pass by the reaction tower bypass duct, is provided with valve in the described reaction tower bypass duct.
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| CN104338704A (en) * | 2014-09-16 | 2015-02-11 | 国家电网公司 | Method and device for cleaning air preheater of coal-fired power plant boiler SCR (selective catalytic reduction) denitration system online |
| CN105311958A (en) * | 2015-11-30 | 2016-02-10 | 华电电力科学研究院 | Online denitration catalyst regeneration device and method |
| CN105435864A (en) * | 2015-11-11 | 2016-03-30 | 福建紫荆环境工程技术有限公司 | In-situ regeneration device and method for glass kiln SCR denitration catalyst |
| CN105570916A (en) * | 2014-10-08 | 2016-05-11 | 中国石油化工股份有限公司 | Coal-fired boiler smoke denitrification apparatus and denitrification method |
| CN106215696A (en) * | 2016-09-22 | 2016-12-14 | 中冶焦耐(大连)工程技术有限公司 | Flue gases of cock oven SCR denitration is anti-blocking, Method of blockage removal and device |
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- 2012-09-28 CN CN 201220504636 patent/CN202860549U/en not_active Expired - Fee Related
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| CN105311958A (en) * | 2015-11-30 | 2016-02-10 | 华电电力科学研究院 | Online denitration catalyst regeneration device and method |
| CN106215696A (en) * | 2016-09-22 | 2016-12-14 | 中冶焦耐(大连)工程技术有限公司 | Flue gases of cock oven SCR denitration is anti-blocking, Method of blockage removal and device |
| CN106268313A (en) * | 2016-09-22 | 2017-01-04 | 中冶焦耐(大连)工程技术有限公司 | A kind of flue gases of cock oven SCR denitration guard method and device |
| CN106492887A (en) * | 2016-10-28 | 2017-03-15 | 浙江大学 | A kind of method of the online activity recovery of SCR denitration |
| CN111432911A (en) * | 2017-10-01 | 2020-07-17 | 艾博森有限公司 | Method of recycling saturated active sorbent of a filter module |
| CN110560178A (en) * | 2019-09-19 | 2019-12-13 | 广东俐峰环保科技有限公司 | Online activation method of catalyst for catalytic oxidation of VOCs |
| CN114367196A (en) * | 2021-12-01 | 2022-04-19 | 苏州西热节能环保技术有限公司 | Method for regenerating SCR denitration catalyst by online semidry method |
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