CN104923317A - Regeneration device and process of anti-aging catalyst for lean-burn natural gas truck - Google Patents
Regeneration device and process of anti-aging catalyst for lean-burn natural gas truck Download PDFInfo
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- CN104923317A CN104923317A CN201510316208.9A CN201510316208A CN104923317A CN 104923317 A CN104923317 A CN 104923317A CN 201510316208 A CN201510316208 A CN 201510316208A CN 104923317 A CN104923317 A CN 104923317A
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- reaction tube
- natural gas
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/10—Capture or disposal of greenhouse gases of nitrous oxide (N2O)
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/20—Capture or disposal of greenhouse gases of methane
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention relates to a regeneration device and process of an anti-aging catalyst for a lean-burn natural gas truck. The regeneration device comprises a reaction tube and a reaction furnace, wherein the reaction furnace is sleeved by the reaction tube; a gas inlet and a gas mixing chamber are formed in the gas inlet end of the reaction tube; a plurality of apertures are formed in the side wall of the gas mixing chamber; a slot allowing a thermocouple to be placed therein is formed in the gas outlet end of the reaction tube; a metal filter screen used for placing a catalyst is arranged in the reaction tube. The regeneration process comprises the following steps: at first, pretreating the anti-aging catalyst for the lean-burn natural gas truck and then placing the pretreated anti-aging catalyst in the regeneration device, charging a reaction gas including CH4, CO, NOX and CO2 into the reaction tube, charging O2, and heating up the reacting furnace to be 450-600 DEG C for 15-120 min when the mass ratio of CH4 to O2 is 1.35-1.55. The regeneration device is simple in structure and compact in design, the regeneration technological process steps are convenient to operate, the catalytic performance of the regenerated catalyst can be effectively improved, and a wide application prospect is achieved.
Description
Technical field
The present invention relates to a kind of renovation process of aging state lean-burn type natural gas automotive catalyst, belong to catalyst preparation technical field.
Background technology
At present, rapidly, in China, lean-burn type natural gas vehicle accounts for more than 70% of gas-fueled vehicles recoverable amount to the development of lean burn natural gas car.Although lean burn natural gas automobile has obvious discharge advantage and fuel economy, containing the most dysoxidizable hydro carbons-methane in its tail gas, need the catalyst of higher catalytic temperature and catalytic activity.But lean burn natural gas engine exhaust temperature is usually less than 600 DEG C, and have very large inhibitory action containing the activity of material to catalyst such as a large amount of steam and sulfur dioxide in tail gas, active component Pd particularly in lean burn natural gas catalyst is easy to sulphur and combines, cause catalyst activity reduction, the requirement of national legislation durability can not be met.Find after deliberation, lean burn natural gas catalyst is easily aging by sulphur, even if having the sulfur content of 1ppm in CNG combustion gas, catalyst is also easy to be aging, and finally has lower conversion ratio.For the present situation of lean-burn type natural gas automotive catalyst ageing resistace difference, a lot of research institution has carried out coating exploitation, object improves the hot sulphur ageing properties of water resistant of lean burn natural gas catalyst, meet emission regulation demands, lean-burn type natural gas catalyst needs to use a large amount of precious metals pds and Pt, in general, under the prerequisite ensureing sulfur content in gas fuel, need to use 250g/ft
3above noble-metal-supported amount just may meet the requirement of Abgasgesetz, and catalyst is with high costs and risk is larger.
Summary of the invention
The object of the invention is to solve the high and problem of ageing resistace difference of lean-burn type natural gas vehicle catalyst preparing cost, provide a kind of aging state lean-burn type natural gas vehicle catalyst regeneration device and regeneration technology, the catalyst catalytic performance after regeneration is good.
The present invention adopts following technical scheme: a kind of aging state lean-burn type natural gas vehicle catalyst regeneration device, comprise reaction tube and reacting furnace, described reaction tube is sheathed in reacting furnace, one end of described reaction tube is inlet end, the other end of described reaction tube is outlet side, described inlet end is provided with air inlet, one end of described air inlet is connected with gas mixing chamber, the other end of described air inlet is connected with gas and vapor permeation tank by air inlet pipe, described gas mixing chamber to be arranged in reaction tube and the sidewall of gas mixing chamber is provided with some apertures, the described port of export is provided with slot for placing thermocouple, metal filter is provided with for placing catalyst in described reaction tube, asbestos layer is provided with between described catalyst and reaction tube wall.
Further, the lower end 25 ~ 30cm of described metal filter distance gas mixing chamber.
Further, the distance of described thermocouple top and metal filter is 2 ~ 10mm.
Adopt the aging state lean-burn type natural gas vehicle catalyst regeneration process that aging state lean-burn type natural gas vehicle catalyst regeneration device realizes, comprise the steps:
(1) first the lean-burn type natural gas automotive catalyst getting aging state adopts compressed air to purge dust in surface and duct, the catalyst after purging is put into quartz tube furnace and carries out pretreatment, first in quartz tube furnace, pass into N
2, then heat quartz tube furnace, it is 150 ~ 200 DEG C that temperature controls, and the heat time is 10 ~ 15min, stops heating, uses N
2purging makes greenhouse cooling to 20 ~ 25 DEG C in quartz tube furnace.
(2) from tubular quartz stove, take out the lean-burn type natural gas automotive catalyst of pretreated aging state, wrap up with asbestos, insert on the metal filter in reaction tube, in reaction tube, pass into reacting gas 5 ~ 10min of mixing to guarantee that atmosphere is stablized, with N in reaction tube
2for Balance Air, then in reaction tube, pass into O
2regulate the content of each component in reacting gas, wherein CH
4and O
2between the ratio of quality be λ, stablize after 1 ~ 2min until λ, heat reacting furnace, heating-up temperature is 450 ~ 600 DEG C, and the heat time is 15 ~ 120min;
(3), after reaction terminates, continue to pass into N in reaction tube
2make reaction tube be cooled to 20 ~ 25 DEG C, then the aging state lean-burn type natural gas automotive catalyst after process is carried out to the test of each temperature spot conversion ratio and performance in reaction tube.
Further, the N2 in described step (2) is the High Purity Nitrogen that purity is more than or equal to 99.99%, and it is 4000 ~ 4500/h that air speed controls.
Further, the size of described step (2) λ value is 1.35 ~ 1.55.
Further, the reacting gas air speed in step (2) in reacting furnace is 39960 ~ 40000/h.
Further, in described step (2), reacting gas need mix in gas and vapor permeation tank, and the component in reacting gas comprises CH
4, CO, NO
xand CO
2.
Regenerating unit structure of the present invention is simple, and compact to design, easy to use, regeneration technology process step convenient operation, effectively can improve the catalytic performance of the catalyst after regeneration, not lose the active ingredient of catalyst surface, be with a wide range of applications.
Accompanying drawing explanation
Fig. 1 is the structural representation of aging state lean-burn type natural gas vehicle catalyst regeneration device in the present invention.
Fig. 2 is the lean-burn type natural gas automotive catalyst conversion results at different temperatures in embodiment one after regeneration technology process.
Fig. 3 is the lean-burn type natural gas automotive catalyst conversion results at different temperatures in embodiment two after regeneration technology process.
Fig. 4 is the lean-burn type natural gas automotive catalyst conversion results at different temperatures in embodiment three after regeneration technology process.
Reference numeral: reaction tube 1, reacting furnace 2, air inlet 3, gas mixing chamber 4, metal filter 5, asbestos layer 6, gas outlet 7, slot 8.
Detailed description of the invention
Below in conjunction with drawings and Examples, the invention will be further described.
As shown in Figure 1, a kind of aging state lean-burn type natural gas vehicle catalyst regeneration device, comprise reaction tube 1 and reacting furnace 2, reaction tube 1 is sheathed in reacting furnace 2, one end of reaction tube 1 is inlet end, the other end of reaction tube is outlet side, inlet end is provided with air inlet 3, one end of air inlet 3 is connected with gas mixing chamber 4, the other end of air inlet 3 is connected with gas and vapor permeation tank by air inlet pipe, gas mixing chamber 4 to be arranged in reaction tube 1 and the sidewall of gas mixing chamber 4 is provided with some apertures, metal filter 5 is provided with for placing catalyst in reaction tube, the port of export is provided with slot 8 for placing thermocouple, the distance of thermocouple top and metal filter 5 is 2 ~ 10mm, metal filter 5 is apart from the lower end 25 ~ 30cm of gas mixing chamber, asbestos layer 6 is provided with between catalyst and reaction tube wall.
Embodiment one: aging state lean-burn type natural gas vehicle catalyst regeneration process, comprises the steps:
(1) first the lean-burn type natural gas automotive catalyst getting aging state adopts compressed air to purge dust in surface and duct, the catalyst after purging is put into quartz tube furnace and carries out pretreatment, first in quartz tube furnace, pass into N
2, carrying out heating and temperature control to quartz tube furnace is 150 DEG C, and the heat time is 10min, then stops heating, uses N
2purging makes greenhouse cooling to 20 DEG C in quartz tube furnace.N
2for purity is more than or equal to the High Purity Nitrogen of 99.99%, air speed controls as 4000/h.
(2) from tubular quartz stove, catalyst is taken out, with asbestos parcel, insert on the metal filter in reaction tube, in reaction tube, pass into the reacting gas 5min that mixes to guarantee that atmosphere is stablized, reacting gas mixes in gas and vapor permeation tank, and the component in reacting gas comprises CH
4, CO, NO
xand CO
2; With N in reaction tube
2for Balance Air, then in reaction tube, pass into O
2regulate the content of each component in reacting gas, wherein CH
4and O
2between the ratio of quality be λ, treat that λ is stabilized in 1.35, after heating 1min, heat reacting furnace, heating-up temperature is 450 DEG C, and the heat time is 15min, and the air speed in reaction tube is 40000/h;
(3), after reaction terminates, continue to pass into N in reaction tube
2make reaction tube be cooled to 20 DEG C, then the lean-burn type natural gas automotive catalyst after regeneration is carried out to the test of each temperature spot conversion ratio and performance in reaction tube.
Embodiment two: aging state lean-burn type natural gas vehicle catalyst regeneration process, comprises the steps:
(1) first the lean-burn type natural gas automotive catalyst getting aging state adopts compressed air to purge dust in surface and duct, the catalyst after purging is put into quartz tube furnace and carries out pretreatment, first in quartz tube furnace, pass into N
2, the temperature of quartz tube furnace controls to be 175 DEG C, and heat, the heat time is 12min, then stops heating, uses N
2purging makes greenhouse cooling to 25 DEG C in quartz tube furnace.N
2for purity is more than or equal to the High Purity Nitrogen of 99.99%, air speed controls as 4200/h.
(2) from tubular quartz stove, catalyst is taken out, with asbestos parcel, insert on the metal filter in reaction tube, in reaction tube, pass into the reacting gas 8min that mixes to guarantee that atmosphere is stablized, reacting gas mixes in gas and vapor permeation tank, and the component in reacting gas comprises CH
4, CO, NO
xand CO
2; With N in reaction tube
2for Balance Air, then in reaction tube, pass into O
2regulate the content of each component in reacting gas, wherein CH
4and O
2between the ratio of quality be λ, treat that λ is stabilized in 1.45, after heating 2min, heat reacting furnace, heating-up temperature is 600 DEG C, and the heat time is 30min, and the air speed in reaction tube is 40000/h;
(3), after reaction terminates, continue to pass into N in reaction tube
2make reaction tube be cooled to 25 DEG C, then the lean-burn type natural gas automotive catalyst after regeneration is carried out to the test of each temperature spot conversion ratio and performance in reaction tube.
Embodiment three: aging state lean-burn type natural gas vehicle catalyst regeneration process, comprises the steps:
(1) first the lean-burn type natural gas automotive catalyst getting aging state adopts compressed air to purge dust in surface and duct, the catalyst after purging is put into quartz tube furnace and carries out pretreatment, first in quartz tube furnace, pass into N
2, the temperature of quartz tube furnace controls to be 200 DEG C, and heat, the heat time is 15min, then stops heating, uses N
2purging makes greenhouse cooling to 25 DEG C in quartz tube furnace.N
2for purity is more than or equal to the High Purity Nitrogen of 99.99%, air speed controls as 4500/h.
(2) from tubular quartz stove, catalyst is taken out, with asbestos parcel, insert on the metal filter in reaction tube, in reaction tube, pass into the reacting gas 10min that mixes to guarantee that atmosphere is stablized, reacting gas mixes in gas and vapor permeation tank, and the component in reacting gas comprises CH
4, CO, NO
xand CO
2; With N in reaction tube
2for Balance Air, then in reaction tube, pass into O
2regulate the content of each component in reacting gas, wherein CH
4and O
2between the ratio of quality be λ, treat that λ is stabilized in 1.55, after heating 2min, heat reacting furnace, heating-up temperature is 550 DEG C, and the heat time is 120min, and the air speed in reaction tube is 40000/h;
(3), after reaction terminates, continue to pass into N in reaction tube
2make reaction tube be cooled to 25 DEG C, then the lean-burn type natural gas automotive catalyst after regeneration is carried out to the test of each temperature spot conversion ratio and performance in reaction tube.
test result:
Choose respectively in each embodiment and regenerate the test that the lean-burn type natural gas automotive catalyst after regenerating in fresh state catalyst before treatment, aging state catalyst and embodiment carries out each temperature spot conversion ratio and performance, lean-burn type natural gas automotive catalyst after regeneration is activated state catalyst, result is as shown in Fig. 2, Fig. 3 and Fig. 4.
As shown in Figure 2: fresh state catalyst 450 DEG C of conversion ratios are 100%, after overaging, aging state catalyst 450 DEG C of conversion ratios drop to 74%, after activating and regenerating, activated state catalyst 450 DEG C of conversion ratios are 90%, and the more aging state catalyst of activated state catalyst 450 DEG C of conversion ratios improve 16%.
As shown in Figure 3: along with the rising of temperature, activated state Catalyst Conversion improves constantly, under temperature is 350 ~ 450 DEG C of conditions, the conversion ratio of activated state catalyst is identical with the conversion ratio of fresh state catalyst, 450 DEG C time, conversion ratio reaches more than 99%, and far away higher than the conversion ratio of state catalyst aging under equal temperature.
As shown in Figure 4: along with the rising of temperature, conversion ratio improves constantly, under 450 DEG C of conditions, conversion ratio is 95%, slightly lower than the conversion ratio of fresh state catalyst.
Claims (8)
1. an aging state lean-burn type natural gas vehicle catalyst regeneration device, it is characterized in that: comprise reaction tube (1) and reacting furnace (2), described reaction tube (1) is sheathed in reacting furnace, one end of described reaction tube (1) is inlet end, the other end of described reaction tube (1) is outlet side, described inlet end is provided with air inlet (3), one end of described air inlet (3) is connected with gas mixing chamber (4), the other end of described air inlet (3) is connected with gas and vapor permeation tank by air inlet pipe, described gas mixing chamber (4) to be arranged in reaction tube (1) and the sidewall of gas mixing chamber (4) is provided with some apertures, the described port of export is provided with slot (8) for placing thermocouple, metal filter (5) is provided with for placing catalyst in described reaction tube (1), asbestos layer (6) is provided with between described catalyst and reaction tube (1) wall.
2. aging state lean-burn type natural gas vehicle catalyst regeneration device as claimed in claim 1, is characterized in that: the lower end 25 ~ 30cm of described metal filter distance gas mixing chamber.
3. aging state lean-burn type natural gas vehicle catalyst regeneration device as claimed in claim 1, is characterized in that: the distance of described thermocouple top and metal filter is 2 ~ 10mm.
4. the aging state lean-burn type natural gas vehicle catalyst regeneration process adopting aging state lean-burn type natural gas vehicle catalyst regeneration device according to claim 1 to realize, is characterized in that: comprise the steps:
(1) first the lean-burn type natural gas automotive catalyst getting aging state adopts compressed air to purge dust in surface and duct, the catalyst after purging is put into quartz tube furnace and carries out pretreatment, first in quartz tube furnace, pass into N
2, then heat quartz tube furnace, it is 150 ~ 200 DEG C that temperature controls, the heat time is 10 ~ 15min, stops heating, uses N
2purging makes greenhouse cooling to 20 ~ 25 DEG C in quartz tube furnace;
(2) from tubular quartz stove, take out the lean-burn type natural gas automotive catalyst of pretreated aging state, wrap up with asbestos, insert on the metal filter in reaction tube, in reaction tube, pass into reacting gas 5 ~ 10min of mixing to guarantee that atmosphere is stablized, with N in reaction tube
2for Balance Air, then in reaction tube, pass into O
2regulate the content of each component in reacting gas, wherein CH
4and O
2between the ratio of quality be λ, stablize after 1 ~ 2min until λ, heat reacting furnace, heating-up temperature is 450 ~ 600 DEG C, and the heat time is 15 ~ 120min;
(3), after reaction terminates, continue to pass into N in reaction tube
2make reaction tube be cooled to 20 ~ 25 DEG C, then the aging state lean-burn type natural gas automotive catalyst after process is carried out to the test of each temperature spot conversion ratio and performance in reaction tube.
5. aging state lean-burn type natural gas vehicle catalyst regeneration process as claimed in claim 4, is characterized in that: the N in described step (2)
2for purity is more than or equal to the High Purity Nitrogen of 99.99%, it is 4000 ~ 4500/h that air speed controls.
6. aging state lean-burn type natural gas vehicle catalyst regeneration process as claimed in claim 4, is characterized in that: the size of described step (2) λ value is 1.35 ~ 1.55.
7. aging state lean-burn type natural gas vehicle catalyst regeneration process as claimed in claim 4, is characterized in that: the reacting gas air speed in described step (2) in reacting furnace is 39960 ~ 40000/h.
8. aging state lean-burn type natural gas vehicle catalyst regeneration process as claimed in claim 4, is characterized in that: in described step (2), reacting gas need mix in gas and vapor permeation tank, and the component in reacting gas comprises CH
4, CO, NO
xand CO
2.
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|---|---|---|---|
| CN201510316208.9A CN104923317B (en) | 2015-06-10 | 2015-06-10 | Regeneration device and process of anti-aging catalyst for lean-burn natural gas truck |
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| CN104923317B CN104923317B (en) | 2017-05-10 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109647318A (en) * | 2019-01-07 | 2019-04-19 | 江苏大学 | A kind of reacting furnace based on NTP regeneration of deactivated catalyst |
| CN114618391A (en) * | 2020-12-10 | 2022-06-14 | 中国科学院大连化学物理研究所 | Solid catalyst filling assembly and filling method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102909104A (en) * | 2012-09-26 | 2013-02-06 | 广东电网公司电力科学研究院 | Thermal regeneration method and device of SCR (selective catalytic reduction) denitration catalyst |
| CN103638991A (en) * | 2013-11-18 | 2014-03-19 | 广东电网公司电力科学研究院 | Composite apparatus for generating SCR denitrification catalyst and testing activity of catalyst before and after regeneration |
-
2015
- 2015-06-10 CN CN201510316208.9A patent/CN104923317B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102909104A (en) * | 2012-09-26 | 2013-02-06 | 广东电网公司电力科学研究院 | Thermal regeneration method and device of SCR (selective catalytic reduction) denitration catalyst |
| CN103638991A (en) * | 2013-11-18 | 2014-03-19 | 广东电网公司电力科学研究院 | Composite apparatus for generating SCR denitrification catalyst and testing activity of catalyst before and after regeneration |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109647318A (en) * | 2019-01-07 | 2019-04-19 | 江苏大学 | A kind of reacting furnace based on NTP regeneration of deactivated catalyst |
| CN114618391A (en) * | 2020-12-10 | 2022-06-14 | 中国科学院大连化学物理研究所 | Solid catalyst filling assembly and filling method |
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| Publication number | Publication date |
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| CN104923317B (en) | 2017-05-10 |
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