CN103920540B - The renovation process of SCR denitration and device in a kind of diesel exhaust aftertreatment - Google Patents
The renovation process of SCR denitration and device in a kind of diesel exhaust aftertreatment Download PDFInfo
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Abstract
The invention discloses renovation process and the device of SCR denitration in a kind of diesel exhaust aftertreatment, it is by swimming exhaust main or the upper air heater in tandem of diesel engine downstream exhaust gas house steward on a diesel engine, and blown to air heater by blower fan, the diesel exhaust gas be first stranded in SCR reactor by the warm air blowoff formed after heating through air heater and displacement, the ozone oxidation contained in the ozone-air gaseous mixture that mixes of ozone gas that recycling is produced by hot-air and ozone generator in blender is removed the particulate be deposited on catalyst duct and is realized catalyst in-situ regeneration, due to catalyst in-situ regeneration in SCR reactor, therefore during regeneration do not need catalyst to shift out SCR reactor, do not exist the process of regenerated catalyst shift-in SCR reactor after regeneration yet, this is fast for particle deposition blocking speed, the diesel SCR reactor of frequent regeneration is needed to be very important, be particularly suitable for the regeneration of boats and ships SCR reactor.
Description
Technical field
The present invention relates to a kind of SCR(SCR) regeneration techniques of denitrating catalyst, especially relate to renovation process and the device of SCR denitration in a kind of diesel exhaust aftertreatment.
Background technology
What the Main propulsion power plant of boats and ships adopted usually is large-scale diesel engine, and the fuel due to large-scale diesel engine is generally the heavy oil that sulfur content is high, impurity content is high, containing a large amount of NO in the waste gas of therefore boats and ships discharge
x, SO
xand PM2.5.It is reported, the SO of PORT OF SHANGHAI boats and ships discharge
x, NO
x12.0%, 9.0% and 5.3% of whole city's emission inventories total amount is accounted for respectively with PM2.5; The atmosphere pollution of Qingdao City's boats and ships discharge is to the SO in urban environment air
xand NO
xcontribution of concentration accounts for 8.0% and 12.9% respectively.Visible, the pollution that causes for harbour and coastal air of waste gas of boats and ships discharge is very important, and the foreign-going ship of whole world navigation is non-local for the pollution of air, and its discharge impacts whole earth atmospheric environment.
In view of the severe contamination of waste gas of boats and ships discharge, International Maritime Organization have passed in October, 2008 amendment that supplemental provisions VI " prevents boats and ships from causing atmosphere pollution rule ", has formulated stricter boats and ships SO
x, NO
xabgasgesetz.According to supplemental provisions VI amendment, by 2016, low-speed diesel engine NO
xemission limit to be down to 3.4g/ (kWh) from 17.0g/ (kWh), high-speed diesel engine NO
xemission limit to be down to 1.96g/ (kWh) from 9.8g/ (kWh).In the face of so strict International Emissions regulation, simple emission controls by improving combustion has been difficult to meet the demands, and emission controls by improving combustion combines with exhaust aftertreatment and solves NO by becoming
xthe inevitable choice of discharge, and SCR (SCR) denitration technology is acknowledged as and effectively reduces NO most
xthe boats and ships exhaust gas aftertreatment techniques of discharge.
But it should be noted that boats and ships SCR denitration system in use encounters a very serious problem, the particle deposition problem on Here it is surface, catalyst duct.A large amount of not only thin but also sticky diesel particulates is very easily at catalyst duct deposited on silicon, and blocking duct, covering catalyst active site position, makes catalyst activity decline rapidly, seriously constrains the use of SCR denitration on boats and ships.
SCR denitration is widely used in power station, has a lot of experience to use for reference.SCR denitration in the use procedure of power station along with the increase of time, there will be catalyst blockage that flying dust causes, the failure phenomenon such as blocking that sulfate causes, catalyst alkali metal are poisoning, arsenic poisoning, activity declines gradually, and general use just needs to change for 3 years.Move on in regenerator or Regenerative beds the spent catalyst changed and regenerate, return use after regeneration, according to external experience, regeneration expense only accounts for 10% of new purchase fresh catalyst expense.For different failure mechanisms, with different renovation process.For the dust stratification in the SCR denitration of power station and carbon deposit, usually adopt the method regeneration of blowing and washing.Also have and propose to adopt coke-burning regeneration method to remove carbon deposit, but because the initiation temperature of carbon deposit is higher than the permissive temperature upper limit of at present conventional SCR commercial catalyst, adopting take oxygen as the sintering that the high temperature coke-burning regeneration method of oxidant is easy to cause catalyst, so high temperature coke-burning regeneration method does not also have actual use.
The patent of invention " the ozone treatment renovation process of a kind of vanadium titanium-base flue gas denitration catalyst agent and device " (notification number: CN102133547A) of China's bulletin discloses ozone low temperature coke-burning regeneration method, and it comprises the following steps: loaded by inactivation catalyst for denitrating flue gas in catalyst regeneration reaction bed; Ozone-air mist is passed into catalyst regeneration reaction bed; At-25 ~ 125 DEG C of oxidation 10 ~ 120min, after oxidation, namely complete the regenerative process of catalyst for denitrating flue gas.China's invention disclosed patent application " a kind of two process cleaning and regeneration methods of vanadium titanium based denitration catalyst " (publication number: CN103386313A) disclose first with ozone make charcoal, again with the renovation process of active supplement solution process, it comprises the following steps: by the cellular vanadium titanium based denitration catalyst dislocation of inactivation in catalyst regeneration reactor; Be the air-ozone mist of 160 ~ 200mg/L by ozone concentration, be filled with in catalyst regeneration reactor with the flow velocity of 2 ~ 4m/min, oxidation processes 50 ~ 70min under the condition of 10 ~ 20 DEG C, must regenerate vanadium titanium based denitration catalyst.The common ground of these two kinds of catalyst recovery process is: the catalyst 1) changed need move to regeneration in catalyst regeneration reaction bed (or regeneration reactor); 2) at the temperature of-25 ~ 125 DEG C or 10 ~ 20 DEG C by air-ozone mist oxidation processes.
Above-mentioned be applied to power station blow and wash renovation process to removing the particulate lodged in boat diesel engine SCR denitration be unaccommodated, reason is: have a large amount of not only thin but also sticky particulate in diesel exhaust gas, very easily in catalyst channel surfaces secure bond, therefore not easily remove by blowing ash.
Catalyst recovery process disclosed in above-mentioned two patents is also unaccommodated to the removing particulate lodged in boat diesel engine SCR denitration; reason is: have a large amount of not only thin but also sticky particulate in diesel exhaust gas; very easily in catalyst channel surfaces secure bond; catalyst duct blocking speed is fast; several days in short-term; within time long 1 ~ 2 month, just need to shut down to remove particulate; for this situation needing frequent regeneration; spent catalyst being transferred to regenerator goes to strange land to regenerate; time-consumingly delaying work, is obviously unaccommodated.
Summary of the invention
Technical problem to be solved by this invention is to provide renovation process and the device of SCR denitration in a kind of diesel exhaust aftertreatment, it can remove the in-situ regeneration that the particulate be deposited on catalyst realizes catalyst fast in position on the spot, and without the need to shifting out shift-in catalyst.
The present invention solves the problems of the technologies described above adopted technical scheme: the renovation process of SCR denitration in a kind of diesel exhaust aftertreatment, is characterized in that comprising the following steps:
1. diesel exhaust gas is stoped to enter SCR reactor;
2. pass in SCR reactor temperature be 190 ~ 240 DEG C containing ozone gas, and make to spray to equably after on the upstream of the catalyst in SCR reactor or downstream flow area containing ozone gas to flow uniformly through catalyst duct, now remove containing the ozone oxidation in ozone gas the particulate be deposited on catalyst duct and realize catalyst in-situ regeneration, and the ozone gas that contains flowed out in SCR reactor finally flows into diesel engine downstream exhaust gas house steward.
Described step 2. in be 700 ~ 1500ppm containing the concentration of ozone in ozone gas, being 0.3 ~ 1.5m/s containing the gas empty bed speed of ozone gas in SCR reactor, is 20 ~ 120min containing the oxidization time of ozone in ozone gas in SCR reactor.
A renovation process for SCR denitration in diesel exhaust aftertreatment, is characterized in that comprising the following steps:
1. diesel exhaust gas is stoped to enter SCR reactor;
2. in SCR reactor, the hot-air that temperature is 210 ~ 260 DEG C is passed into, and on the upstream making hot-air spray to the catalyst in SCR reactor equably or downstream flow area, to purge and to replace the diesel exhaust gas be stranded in SCR reactor;
3. when the temperature of the catalyst in SCR reactor is down to consistent with the temperature of hot-air, pass in SCR reactor by hot-air with to mix containing ozone gas and temperature is the ozone-air gaseous mixture of 190 ~ 240 DEG C, and ozone-air gaseous mixture is sprayed to after on the upstream of the catalyst in SCR reactor or downstream flow area equably flow uniformly through catalyst duct, ozone oxidation now in ozone-air gaseous mixture is removed the particulate be deposited on catalyst duct and is realized catalyst in-situ regeneration, and the ozone-air gaseous mixture flowed out in SCR reactor finally flows into diesel engine downstream exhaust gas house steward.
Described step 3. in the temperature of ozone-air gaseous mixture be 200 ~ 220 DEG C.
Described step 3. in ozone-air gaseous mixture the concentration of ozone be 700 ~ 1500ppm, the gas empty bed speed of ozone-air gaseous mixture in SCR reactor is 0.3 ~ 1.5m/s, and in ozone-air gaseous mixture, the oxidization time of ozone in SCR reactor is 20 ~ 120min.
The regenerating unit that in a kind of above-mentioned diesel exhaust aftertreatment, the renovation process of SCR denitration is corresponding, it is characterized in that comprising blower fan, air heater, blender, ozone generator and multiple nozzle, described air heater is in tandem on diesel engine upstream exhaust main or diesel engine downstream exhaust gas house steward, the air outlet of described blower fan is connected with a port of the heating tube in described air heater, another port of heating tube in described air heater is connected with an entrance of described blender, the gas outlet of described ozone generator is connected with another entrance of described blender, the outlet of described blender is connected with each described nozzle, on the upstream that multiple described nozzle is evenly arranged in the catalyst in SCR reactor or downstream flow area.
Described air heater is in tandem on diesel engine downstream exhaust gas house steward, and time on the downstream flow area of the catalyst of described arrangement of nozzles in described SCR reactor, be connected to and the outlet pipe on described SCR reactor be provided with for stoping diesel exhaust gas to enter described SCR reactor and stop the ozone-air gaseous mixture short circuit of described nozzle ejection and enter the valve downstream of diesel engine downstream exhaust gas house steward simultaneously, described valve downstream is between described air heater and described SCR reactor;
Described air heater is in tandem on diesel engine downstream exhaust gas house steward, and time on the upstream flow area of the catalyst of described arrangement of nozzles in described SCR reactor, be connected to the upstream valve admission line on described SCR reactor is provided with for stoping diesel exhaust gas to enter described SCR reactor;
Described air heater is in tandem on the exhaust main of diesel engine upstream, and time on the downstream flow area of the catalyst of described arrangement of nozzles in described SCR reactor, be connected to and the outlet pipe on described SCR reactor be provided with for stoping diesel exhaust gas to enter described SCR reactor and stop the ozone-air gaseous mixture short circuit of described nozzle ejection and enter the valve downstream of diesel engine downstream exhaust gas house steward simultaneously;
Described air heater is in tandem on the exhaust main of diesel engine upstream, and time on the upstream flow area of the catalyst of described arrangement of nozzles in described SCR reactor, be connected to the upstream valve admission line on described SCR reactor is provided with for stoping diesel exhaust gas to enter described SCR reactor, described upstream valve is between described air heater and described SCR reactor.
Also comprise diesel exhaust gas by-pass line, described diesel exhaust gas by-pass line is connected between diesel engine upstream exhaust main and diesel engine downstream exhaust gas house steward, and be in parallel with described SCR reactor, described diesel exhaust gas by-pass line is provided with bypath valve.
The total pipeline that the outlet of described blender is connected with multiple described nozzle is provided with nozzle valve.
When catalyst in described SCR reactor divides multilayer to arrange, the upstream flow area of every layer of catalyst in described SCR reactor or downstream flow area are all furnished with multiple described nozzle.
Described air heater is gas-to-gas heat exchanger; Described blender is venturi mixer.
Compared with prior art, the invention has the advantages that: by swimming exhaust main or the upper air heater in tandem of diesel engine downstream exhaust gas house steward on a diesel engine, and blown to air heater by blower fan, the diesel exhaust gas be first stranded in SCR reactor by the warm air blowoff formed after heating through air heater and displacement, the ozone oxidation contained in the ozone-air gaseous mixture that mixes of ozone gas that recycling is produced by hot-air and ozone generator in blender is removed the particulate be deposited on catalyst duct and is realized catalyst in-situ regeneration, due to catalyst in-situ regeneration in SCR reactor, therefore during regeneration do not need catalyst to shift out SCR reactor, do not exist the process of regenerated catalyst shift-in SCR reactor after regeneration yet, this is fast for particle deposition blocking speed, the diesel SCR reactor of frequent regeneration is needed to be very important, be particularly suitable for the regeneration of boats and ships SCR reactor.
Accompanying drawing explanation
Fig. 1 is the structural representation of the regenerating unit that embodiment one provides;
Fig. 2 is the structural representation of the regenerating unit that embodiment two provides;
Fig. 3 is the structural representation of the regenerating unit that embodiment three provides;
Fig. 4 is the ozone oxidation temperature of the diesel particulation be collected in glass filter cylinder and the relation schematic diagram of oxidation rate.
Detailed description of the invention
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
Embodiment one:
Suppose that the SCR reactor 11 having two to be arranged in parallel in diesel exhaust aftertreatment is for SCR denitration, then the present embodiment propose a kind of diesel exhaust aftertreatment in SCR denitration regenerating unit as shown in Figure 1, it comprises blower fan 2, air heater 3, blender 4, ozone generator 5 and multiple nozzle 6, air heater 3 is in tandem on diesel engine downstream exhaust gas house steward 19, the air outlet of blower fan 2 is connected with a port of the heating tube in air heater 3, the air in the heating tube in air heater 3 is sent into by the diesel exhaust gas heating blower 2 in diesel engine downstream exhaust gas house steward 19, another port of heating tube in air heater 3 is connected with an entrance of blender 4, the gas outlet of ozone generator 5 is connected with another entrance of blender 4, rapid mixing containing ozone gas and in blender 4 from the gas outlet of the hot-air injection ozone generator 5 of air heater 3 forms ozone-air gaseous mixture, the outlet of blender 4 is connected with each nozzle 6, the total pipeline that the outlet of blender 4 is connected with multiple nozzle 6 is provided with nozzle valve 61, multiple nozzle 6 is evenly arranged on the downstream flow area of the catalyst 12 in SCR reactor 11, be connected to and the outlet pipe on SCR reactor 11 be provided with for stoping diesel exhaust gas to enter SCR reactor 11 and the ozone-air gaseous mixture short circuit stoping nozzle 6 to spray and enter the valve downstream 14 of diesel engine downstream exhaust gas house steward 19 simultaneously, valve downstream 14 is between air heater 3 and SCR reactor 11, diesel exhaust gas by-pass line 71 is connected with between diesel engine upstream exhaust main 18 and diesel engine downstream exhaust gas house steward 19, diesel exhaust gas by-pass line 71 and SCR reactor 11 are in parallel, diesel exhaust gas by-pass line 71 is provided with bypath valve 72.
Embodiment two:
The difference of the regenerating unit that the present embodiment provides and the regenerating unit that embodiment one provides is: multiple nozzle 6 is evenly arranged on the upstream flow area of the catalyst 12 in SCR reactor 11, in this case the upstream valve 13 admission line on SCR reactor 11 is provided with for stoping diesel exhaust gas to enter SCR reactor 11 is connected to, namely the regenerating unit that provides of the present embodiment as shown in Figure 2, it comprises blower fan 2, air heater 3, blender 4, ozone generator 5 and multiple nozzle 6, air heater 3 is in tandem on diesel engine downstream exhaust gas house steward 19, the air outlet of blower fan 2 is connected with a port of the heating tube in air heater 3, another port of heating tube in air heater 3 is connected with an entrance of blender 4, the gas outlet of ozone generator 5 is connected with another entrance of blender 4, the outlet of blender 4 is connected with each nozzle 6, the total pipeline that the outlet of blender 4 is connected with multiple nozzle 6 is provided with nozzle valve 61, multiple nozzle 6 is evenly arranged on the upstream flow area of the catalyst 12 in SCR reactor 11, be connected to the upstream valve 13 admission line on SCR reactor 11 is provided with for stoping diesel exhaust gas to enter SCR reactor 11, diesel exhaust gas by-pass line 71 is connected with between diesel engine upstream exhaust main 18 and diesel engine downstream exhaust gas house steward 19, diesel exhaust gas by-pass line 71 and SCR reactor 11 are in parallel, diesel exhaust gas by-pass line 71 is provided with bypath valve 72.
Embodiment three:
The difference of the regenerating unit that the present embodiment provides and the regenerating unit that embodiment one provides is: due to the 12 points of two-layer layouts of the catalyst in SCR reactor 11, the downstream flow area of every layer of catalyst therefore in SCR reactor 11 is all furnished with multiple nozzle 6, namely the regenerating unit that provides of the present embodiment as shown in Figure 3, it comprises blower fan 2, air heater 3, blender 4, ozone generator 5 and multiple nozzle 6, air heater 3 is in tandem on diesel engine downstream exhaust gas house steward 19, the air outlet of blower fan 2 is connected with a port of the heating tube in air heater 3, another port of heating tube in air heater 3 is connected with an entrance of blender 4, the gas outlet of ozone generator 5 is connected with another entrance of blender 4, the outlet of blender 4 is connected with each nozzle 6, the total pipeline that the outlet of blender 4 is connected with the multiple nozzles 6 on the downstream flow area being evenly arranged in every layer of catalyst 12 is provided with nozzle valve 61, be connected to and the outlet pipe on SCR reactor 11 be provided with for stoping diesel exhaust gas to enter SCR reactor 11 and the ozone-air gaseous mixture short circuit stoping nozzle 6 to spray and enter the valve downstream 14 of diesel engine downstream exhaust gas house steward 19 simultaneously, valve downstream 14 is between air heater 3 and SCR reactor 11, diesel exhaust gas by-pass line 71 is connected with between diesel engine upstream exhaust main 18 and diesel engine downstream exhaust gas house steward 19, diesel exhaust gas by-pass line 71 and SCR reactor 11 are in parallel, diesel exhaust gas by-pass line 71 is provided with bypath valve 72.
The present embodiment also can improve on the basis of embodiment two, the upstream flow area of the every layer of catalyst 12 namely in SCR reactor 11 being all furnished with multiple nozzle 6, the admission line that requires to be connected on SCR reactor 11 being in this case provided with the upstream valve 13 for stoping diesel exhaust gas to enter SCR reactor 11.
In above-mentioned three embodiments, air heater 3 adopts existing gas-to-gas heat exchanger; Blender 4 adopts existing venturi mixer; Ozone generator 5 adopts prior art; Nozzle 6 adopts conventional gas nozzle; Upstream valve 13, valve downstream 14, bypath valve 72 and nozzle valve 61 all adopt existing common valve.
In above-mentioned three embodiments, also can by tandem for air heater 3 on diesel engine upstream exhaust main 18, in this case, when on the downstream flow area that nozzle 6 is arranged in the catalyst 12 in SCR reactor 11, be connected to the valve downstream 14 outlet pipe on SCR reactor 11 is provided with for stoping diesel exhaust gas to enter SCR reactor 11; When on the upstream flow area that nozzle 6 is arranged in the catalyst 12 in SCR reactor 11, be connected to the upstream valve 13 admission line on SCR reactor 11 is provided with for stoping diesel exhaust gas to enter SCR reactor 11, upstream valve 13 is between air heater 3 and SCR reactor 11.
In above-mentioned three embodiments, diesel exhaust gas by-pass line 71 can not be arranged, if but only there is a SCR reactor 11 in diesel exhaust aftertreatment for SCR denitration, then diesel exhaust gas by-pass line 71 needs to arrange, because the ozone-air gaseous mixture flowed out in SCR reactor need flow into diesel engine downstream exhaust gas house steward 19 through diesel exhaust gas by-pass line 71.
In above-mentioned three embodiments, if only have a SCR reactor 11 in diesel exhaust aftertreatment for SCR denitration, then nozzle valve 61 can not be arranged.
Embodiment four:
The present embodiment is the renovation process that the regenerating unit utilizing embodiment one to provide realizes catalyst regeneration, and it comprises the following steps:
1. suppose that one of them the SCR reactor in Fig. 1 prepares regeneration, then close the valve downstream on the outlet pipe be installed on this SCR reactor, stop diesel exhaust gas to enter this SCR reactor.
2. the nozzle valve relevant to the nozzle be arranged in this SCR reactor is opened, open blower fan to blow to air heater, after air heater heating, formation temperature is 220 DEG C of hot-airs, then in this SCR reactor, the hot-air that temperature is 220 DEG C is passed into by blender, and make hot-air spray on the downstream flow area of the catalyst in this SCR reactor equably, to purge and to replace the diesel exhaust gas be stranded in this SCR reactor by nozzle.
3. when the temperature of the catalyst in this SCR reactor is down to consistent with the temperature of hot-air, open ozone generator, ozone generator produce containing ozone gas be incorporated in blender with the ozone-air gaseous mixture that the hot-air rapid mixing formation temperature from air heater is 200 DEG C, in this SCR reactor, ozone-air gaseous mixture is passed under the driving of blower fan, and on the downstream flow area making ozone-air gaseous mixture spray to the catalyst in this SCR reactor equably by nozzle after flow uniformly through catalyst duct, ozone oxidation now in ozone-air gaseous mixture is removed the particulate be deposited on catalyst duct and is realized catalyst in-situ regeneration, and the ozone-air gaseous mixture flowed out in this SCR reactor finally flows into diesel engine downstream exhaust gas house steward through diesel exhaust gas by-pass line (now bypath valve need be opened) or another SCR reactor, ozone residual in ozone-air gaseous mixture is at diesel engine downstream exhaust gas house steward pyrolyze.At this, in ozone-air gaseous mixture, the concentration of ozone is 1500ppm, and the gas empty bed speed of ozone-air gaseous mixture in this SCR reactor is 1.0m/s, and in ozone-air gaseous mixture, the oxidization time of ozone in SCR reactor is 30min.
After catalyst original position regeneration ending in this SCR reactor, close the nozzle valve relevant to the nozzle be arranged in this SCR reactor successively, close ozone generator, close blower fan, the valve downstream opened on the outlet pipe of this SCR reactor, make diesel exhaust gas flow into this SCR reactor, this SCR reactor reverts to SCR denitration state.If another SCR reactor needs to carry out catalyst in-situ regeneration, then can carry out with same step.
Embodiment five:
The present embodiment is identical with the process of the renovation process that embodiment four provides, difference is: the temperature of the hot-air formed after air heater is 240 DEG C, the temperature of ozone-air gaseous mixture is 215 DEG C, the concentration of ozone is 700ppm in ozone-air gaseous mixture, the gas empty bed speed of ozone-air gaseous mixture in SCR reactor is 1.5m/s, and in ozone-air gaseous mixture, the oxidization time of ozone in SCR reactor is 45min.
Embodiment six:
The present embodiment is identical with the process of the renovation process that embodiment four provides, difference is: the temperature of the hot-air formed after air heater is 210 DEG C, the temperature of ozone-air gaseous mixture is 190 DEG C, the concentration of ozone is 1500ppm in ozone-air gaseous mixture, the gas empty bed speed of ozone-air gaseous mixture in SCR reactor is 0.3m/s, and in ozone-air gaseous mixture, the oxidization time of ozone in SCR reactor is 100min.
Embodiment seven:
The present embodiment is the renovation process that the regenerating unit utilizing embodiment two to provide realizes catalyst regeneration, and it comprises the following steps:
1. suppose that one of them the SCR reactor in Fig. 2 prepares regeneration, then close the upstream valve on the admission line be installed on this SCR reactor, stop diesel exhaust gas to enter this SCR reactor.
2. the nozzle valve relevant to the nozzle be arranged in this SCR reactor is opened, open blower fan to blow to air heater, after air heater heating, formation temperature is 220 DEG C of hot-airs, then in this SCR reactor, the hot-air that temperature is 220 DEG C is passed into by blender, and make hot-air spray on the upstream flow area of the catalyst in this SCR reactor equably, to purge and to replace the diesel exhaust gas be stranded in this SCR reactor by nozzle.
3. when the temperature of the catalyst in this SCR reactor is down to consistent with the temperature of hot-air, open ozone generator, ozone generator produce containing ozone gas be incorporated in blender with the ozone-air gaseous mixture that the hot-air rapid mixing formation temperature from air heater is 200 DEG C, in this SCR reactor, ozone-air gaseous mixture is passed under the driving of blower fan, and on the upstream flow area making ozone-air gaseous mixture spray to the catalyst in this SCR reactor equably by nozzle after flow uniformly through catalyst duct, ozone oxidation now in ozone-air gaseous mixture is removed the particulate be deposited on catalyst duct and is realized catalyst in-situ regeneration, and the ozone-air gaseous mixture flowed out in this SCR reactor directly finally flows into diesel engine downstream exhaust gas house steward through the outlet pipe of this SCR reactor, ozone residual in ozone-air gaseous mixture is at diesel engine downstream exhaust gas house steward pyrolyze.At this, in ozone-air gaseous mixture, the concentration of ozone is 1500ppm, and the gas empty bed speed of ozone-air gaseous mixture in this SCR reactor is 1.5m/s, and in ozone-air gaseous mixture, the oxidization time of ozone in SCR reactor is 20min.
After catalyst original position regeneration ending in this SCR reactor, close the nozzle valve relevant to the nozzle be arranged in this SCR reactor successively, close ozone generator, close blower fan, the upstream valve opened on the admission line of this SCR reactor, make diesel exhaust gas flow into this SCR reactor, this SCR reactor reverts to SCR denitration state.If another SCR reactor needs to carry out catalyst in-situ regeneration, then can carry out with same step.
Embodiment eight:
The present embodiment is the renovation process that the regenerating unit utilizing embodiment three to provide realizes catalyst regeneration, and it comprises the following steps:
1. suppose that one of them the SCR reactor in Fig. 3 prepares regeneration, then close the valve downstream on the outlet pipe be installed on this SCR reactor, stop diesel exhaust gas to enter this SCR reactor.
2. the nozzle valve relevant to the nozzle in the lower catalyst agent being arranged in this SCR reactor is opened, open blower fan to blow to air heater, after air heater heating, formation temperature is 220 DEG C of hot-airs, then in this SCR reactor, the hot-air that temperature is 220 DEG C is passed into by blender, and make hot-air spray on the downstream flow area of the lower catalyst agent in this SCR reactor equably, to purge and to replace the diesel exhaust gas be stranded in this SCR reactor by nozzle.
3. when the temperature of the catalyst in this SCR reactor is down to consistent with the temperature of hot-air, open ozone generator, ozone generator produce containing ozone gas be incorporated in blender with the ozone-air gaseous mixture that the hot-air rapid mixing formation temperature from air heater is 200 DEG C, in this SCR reactor, ozone-air gaseous mixture is passed under the driving of blower fan, and on the downstream flow area making ozone-air gaseous mixture spray to the lower catalyst agent in this SCR reactor equably by nozzle after flow uniformly through catalyst duct, ozone oxidation now in ozone-air gaseous mixture is removed the particulate be deposited on catalyst duct and is realized catalyst in-situ regeneration, and the ozone-air gaseous mixture flowed out in this SCR reactor finally flows into diesel engine downstream exhaust gas house steward through diesel exhaust gas by-pass line (now bypath valve need be opened) or another SCR reactor, ozone residual in ozone-air gaseous mixture is at diesel engine downstream exhaust gas house steward pyrolyze.At this, in ozone-air gaseous mixture, the concentration of ozone is 1120ppm, and the gas empty bed speed of ozone-air gaseous mixture in this SCR reactor is 0.8m/s, and in ozone-air gaseous mixture, the oxidization time of ozone in SCR reactor is 50min.
4. the nozzle valve relevant to the nozzle in the lower catalyst agent being arranged in this SCR reactor is closed, and open the nozzle valve relevant to the nozzle in the overlying catalyst being arranged in this SCR reactor, hot-air is made to spray on the downstream flow area of the overlying catalyst in this SCR reactor equably, catalyst duct is flowed uniformly through after on the downstream flow area making ozone-air gaseous mixture spray to the overlying catalyst in this SCR reactor equably again, ozone oxidation now in ozone-air gaseous mixture is removed the particulate be deposited on catalyst duct and is realized catalyst in-situ regeneration.
At this, when the catalyst layering in SCR reactor is arranged, the process of catalyst in-situ regeneration also can carrying out in layer, like this when on the downstream flow area that nozzle is arranged on catalyst, to the decomposition of ozone in lower catalyst agent can be reduced during overlying catalyst in-situ regeneration, improve the utilization rate of ozone.
After catalyst original position regeneration ending in this SCR reactor, close the nozzle valve relevant to the nozzle be arranged in this SCR reactor successively, close ozone generator, close blower fan, the valve downstream opened on the outlet pipe of this SCR reactor, make diesel exhaust gas flow into this SCR reactor, this SCR reactor reverts to SCR denitration state.If another SCR reactor needs to carry out catalyst in-situ regeneration, then can carry out with same step.
In above-described embodiment four to embodiment eight, the oxidizing temperature (temperature of ozone-air gaseous mixture) of ozone is set to 200 ~ 220 DEG C, lower than the temperature permissible upper of SCR catalyst, like this can not scaling loss SCR catalyst, and the temperature of obvious thermal decomposition is there is lower than ozone, make ozone utilization rate high, and oxidation rate being fast, the recovery time is short, is the reaction temperature of optimum ozone oxidation diesel particulation.Fig. 4 gives the ozone oxidation temperature of the diesel particulation be collected in glass filter cylinder and the relation of oxidation rate, as can be seen from Figure 4, in ozone-air gaseous mixture, the concentration of ozone is 700ppm, and the temperature of ozone-air gaseous mixture is when being 150 DEG C, pass into ozone-air gaseous mixture 45min, filter cylinder pressure drop is almost constant, and it is oxidized that taking-up filter cylinder has no particulate; When the temperature of ozone-air gaseous mixture is 155 DEG C, ozone starts there is obvious oxidation to particulate, but oxidation rate is also unhappy; When the temperature of ozone-air gaseous mixture is 200 DEG C ~ 240 DEG C, oxidation rate is fast; Temperature raises again, and when the temperature of ozone-air gaseous mixture is 250 DEG C, oxidation effectiveness is deteriorated, and when the temperature of ozone-air gaseous mixture is 280 DEG C, oxidation effectiveness is deteriorated further, and reason is the rising along with temperature, and ozone decompose themselves speed is also accelerated.Therefore, the preference temperature of ozone oxidation particulate is 200 DEG C ~ 240 DEG C, the ozone treatment renovation process of existing a kind of vanadium titanium-base flue gas denitration catalyst agent regenerates under-25 ~ 125 DEG C of conditions, and two process cleaning and regeneration methods of existing a kind of vanadium titanium based denitration catalyst regenerate under 10 ~ 20 DEG C of conditions, ozone is very slow to diesel particulation oxidation rate, is not suitable for the original position rapid regeneration of catalyst.
Embodiment nine:
The renovation process that the present embodiment provides directly utilizes and realizes catalyst in-situ regeneration containing ozone gas, and namely detailed process is:
1. diesel exhaust gas is stoped to enter SCR reactor.
2. pass in SCR reactor temperature be 190 ~ 240 DEG C containing ozone gas, and make to spray to equably after on the upstream of the catalyst in SCR reactor or downstream flow area containing ozone gas to flow uniformly through catalyst duct, now remove containing the ozone oxidation in ozone gas the particulate be deposited on catalyst duct and realize catalyst in-situ regeneration, and the ozone gas that contains flowed out in SCR reactor finally flows into diesel engine downstream exhaust gas house steward, wherein, can be controlled within the scope of 700 ~ 1500ppm containing the concentration of ozone in ozone gas, can be controlled within the scope of 0.3 ~ 1.5m/s containing the gas empty bed speed of ozone gas in SCR reactor, can be controlled within the scope of 20 ~ 120min containing the oxidization time of ozone in ozone gas in SCR reactor.
The basis of the regenerating unit that the regenerating unit realizing the employing of above-mentioned regenerative process can provide in embodiment one to embodiment three is improved, removes air heater.This renovation process well can realize catalyst regeneration, just the renovation process that provides than embodiment four to embodiment eight of effect to realize effect slightly poor.
Claims (8)
1. the renovation process of SCR denitration in diesel exhaust aftertreatment, is characterized in that comprising the following steps:
1. diesel exhaust gas is stoped to enter SCR reactor;
2. pass in SCR reactor temperature be 190 ~ 240 DEG C containing ozone gas, and make to spray to equably after on the upstream of the catalyst in SCR reactor or downstream flow area containing ozone gas to flow uniformly through catalyst duct, now remove containing the ozone oxidation in ozone gas the particulate be deposited on catalyst duct and realize catalyst in-situ regeneration, and the ozone gas that contains flowed out in SCR reactor finally flows into diesel engine downstream exhaust gas house steward;
Described step 2. in be 700 ~ 1500ppm containing the concentration of ozone in ozone gas, being 0.3 ~ 1.5m/s containing the gas empty bed speed of ozone gas in SCR reactor, is 20 ~ 120min containing the oxidization time of ozone in ozone gas in SCR reactor.
2. the renovation process of SCR denitration in diesel exhaust aftertreatment, is characterized in that comprising the following steps:
1. diesel exhaust gas is stoped to enter SCR reactor;
2. in SCR reactor, the hot-air that temperature is 210 ~ 260 DEG C is passed into, and on the upstream making hot-air spray to the catalyst in SCR reactor equably or downstream flow area, to purge and to replace the diesel exhaust gas be stranded in SCR reactor;
3. when the temperature of the catalyst in SCR reactor is down to consistent with the temperature of hot-air, pass in SCR reactor by hot-air with to mix containing ozone gas and temperature is the ozone-air gaseous mixture of 190 ~ 240 DEG C, and ozone-air gaseous mixture is sprayed to after on the upstream of the catalyst in SCR reactor or downstream flow area equably flow uniformly through catalyst duct, ozone oxidation now in ozone-air gaseous mixture is removed the particulate be deposited on catalyst duct and is realized catalyst in-situ regeneration, and the ozone-air gaseous mixture flowed out in SCR reactor finally flows into diesel engine downstream exhaust gas house steward,
Described step 3. in the temperature of ozone-air gaseous mixture be 200 ~ 220 DEG C; In ozone-air gaseous mixture, the concentration of ozone is 700 ~ 1500ppm, and the gas empty bed speed of ozone-air gaseous mixture in SCR reactor is 0.3 ~ 1.5m/s, and in ozone-air gaseous mixture, the oxidization time of ozone in SCR reactor is 20 ~ 120min.
3. the regenerating unit that in a diesel exhaust aftertreatment according to claim 2, the renovation process of SCR denitration is corresponding, it is characterized in that comprising blower fan, air heater, blender, ozone generator and multiple nozzle, described air heater is in tandem on diesel engine upstream exhaust main or diesel engine downstream exhaust gas house steward, the air outlet of described blower fan is connected with a port of the heating tube in described air heater, another port of heating tube in described air heater is connected with an entrance of described blender, the gas outlet of described ozone generator is connected with another entrance of described blender, the outlet of described blender is connected with each described nozzle, on the upstream that multiple described nozzle is evenly arranged in the catalyst in SCR reactor or downstream flow area.
4. the regenerating unit of SCR denitration in a kind of diesel exhaust aftertreatment according to claim 3, it is characterized in that described air heater is in tandem on diesel engine downstream exhaust gas house steward, and time on the downstream flow area of the catalyst of described arrangement of nozzles in described SCR reactor, be connected to and the outlet pipe on described SCR reactor be provided with for stoping diesel exhaust gas to enter described SCR reactor and stop the ozone-air gaseous mixture short circuit of described nozzle ejection and enter the valve downstream of diesel engine downstream exhaust gas house steward simultaneously, described valve downstream is between described air heater and described SCR reactor,
Described air heater is in tandem on diesel engine downstream exhaust gas house steward, and time on the upstream flow area of the catalyst of described arrangement of nozzles in described SCR reactor, be connected to the upstream valve admission line on described SCR reactor is provided with for stoping diesel exhaust gas to enter described SCR reactor;
Described air heater is in tandem on the exhaust main of diesel engine upstream, and time on the downstream flow area of the catalyst of described arrangement of nozzles in described SCR reactor, be connected to and the outlet pipe on described SCR reactor be provided with for stoping diesel exhaust gas to enter described SCR reactor and stop the ozone-air gaseous mixture short circuit of described nozzle ejection and enter the valve downstream of diesel engine downstream exhaust gas house steward simultaneously;
Described air heater is in tandem on the exhaust main of diesel engine upstream, and time on the upstream flow area of the catalyst of described arrangement of nozzles in described SCR reactor, be connected to the upstream valve admission line on described SCR reactor is provided with for stoping diesel exhaust gas to enter described SCR reactor, described upstream valve is between described air heater and described SCR reactor.
5. the regenerating unit of SCR denitration in a kind of diesel exhaust aftertreatment according to claim 3 or 4, characterized by further comprising diesel exhaust gas by-pass line, described diesel exhaust gas by-pass line is connected between diesel engine upstream exhaust main and diesel engine downstream exhaust gas house steward, and be in parallel with described SCR reactor, described diesel exhaust gas by-pass line is provided with bypath valve.
6. the regenerating unit of SCR denitration in a kind of diesel exhaust aftertreatment according to claim 5, is characterized in that the total pipeline that the outlet of described blender is connected with multiple described nozzle is provided with nozzle valve.
7. the regenerating unit of SCR denitration in a kind of diesel exhaust aftertreatment according to claim 6, when it is characterized in that catalyst in described SCR reactor point multilayer is arranged, the upstream flow area of every layer of catalyst in described SCR reactor or downstream flow area are all furnished with multiple described nozzle.
8. the regenerating unit of SCR denitration in a kind of diesel exhaust aftertreatment according to claim 7, is characterized in that described air heater is gas-to-gas heat exchanger; Described blender is venturi mixer.
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| CN107806359B (en) * | 2017-11-24 | 2024-03-29 | 江苏科技大学 | Power release device of ship denitration system based on SCR |
| CN108295891B (en) * | 2018-01-10 | 2021-04-06 | 绍兴文理学院 | In-situ regeneration system and method of Cu-based molecular sieve denitration catalyst for diesel vehicle tail gas purification |
| CN109999923B (en) * | 2019-04-28 | 2023-01-13 | 上海理工大学 | Method and device for realizing in-situ activation of SCR (selective catalytic reduction) catalyst by utilizing ozone |
| CN112076624B (en) * | 2020-09-15 | 2022-07-08 | 国网山东省电力公司电力科学研究院 | SCR denitration device inlet smoke temperature adjusting system and method |
| TW202342155A (en) | 2022-04-01 | 2023-11-01 | 丹麥商托普索公司 | A process for catalytic filtration of sulfur-containing gases using selective catalytic reduction |
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