CN103961954A - Online regeneration method of filter element of dust remover for filtering high-temperature combustible dust - Google Patents
Online regeneration method of filter element of dust remover for filtering high-temperature combustible dust Download PDFInfo
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- CN103961954A CN103961954A CN201410202555.4A CN201410202555A CN103961954A CN 103961954 A CN103961954 A CN 103961954A CN 201410202555 A CN201410202555 A CN 201410202555A CN 103961954 A CN103961954 A CN 103961954A
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Abstract
The invention discloses an online regeneration method of a filter element of a dust remover for filtering high-temperature combustible dust. The online regeneration method comprises a step of poor oxygen combustion of oxygen-poor gas sent to the outside of the filter element of the dust remover and combustible dust on the filter element of the dust remover. The oxygen content of the oxygen-poor gas is 2-17 percent, and the poor oxygen combustion step and a step of back-blow dedusting of the filter element of the dust remover are alternated. The method breaks through the limit of a traditional back-blow dedusting process, realizes online regeneration of the filter element by combination of a poor oxygen combustion technology and a back-blow dedusting measure, and can thoroughly clear blind angles of dust accumulation on the surface of the filter element so as to improve the filtering efficiency of the filter element and prolong the service life of the filter element. The online regeneration method has the advantages of being reasonable in design, low in cost and long in operation cycle, the filter element is high in regenerability and high in filtering efficiency and has good promotion and use values, equipment is safe and reliable, and the operation cost is reduced.
Description
Technical field
The invention belongs to filter element of duster dedusting technology field, particularly a kind of filter element of duster on-line regeneration method for the flammable dirt environment of high temperature.
Background technology
At present, China's oil, natural gas resource shortage, coal will be the topmost primary energy of China quite over a long time in future.But coal conversion utilizes and has problems and challenge in process, as low in comprehensive utilization ratio, environmental pollution serious, shortage of water resources and CO2 emissions large etc.Therefore, development of coal high-efficiency cleaning comprehensive utilization technique is realized the inevitable choice that energy-saving and emission-reduction are China's energy industry development.And just comprise the industrial policy such as " coal upgrading and comprehensive utilization of resources ", " for brown coal, lower-grade metamorphic bituminous staged conversion, comprehensive utilization " in " clean coal technology development in science and technology " the 12 " ad hoc planning " of national encourage growth.In current dry dust removal technique, to adopt dust-removal cloth-bag the most common as meticulous deduster, but because the normal working temperature that dust-removal cloth-bag can bear treats that the temperature of dedusting coal gas is much lower conventionally, be difficult to transformation, adopt in addition filter core tubular structure to carry out dust removal and filtration to high-temperature dusty gas, realize gas solid separation and gas purification, through filtering, the dusty gas purifying enters air-purifying chamber, dust filter is stayed in the dirt pocket of deduster, be deposited in ash bucket, and the filter core that deduster is used its outer surface in dust removal by filtration process can adsorb a large amount of granule dusts, along with dust constantly increases, will affect filter quality, therefore need the dust that cartridge surface is piled up to remove, there is the design of part producer to adopt dust removal with machine device, as manipulator front end is installed brush, or mechanical oscillation method, but not only complex structure, and because action consistency is poor, easily damage the filter core of deduster, the air-purifying chamber that after filter core damage, dust enters deduster will removing pollutant gas be brought subsequent handling into and is caused great loss.What generally use now is that injection tube realizes reverse deashing; but when blowback due to nozzle form with enter filter core purge gas form high pressure breathing space rupture location different; cause existing repeatedly blowback to be difficult to the position, dead angle of removing; generally be positioned at compared with filter core position on the lower; on filter core, adhesive dust is difficult to remove must affect filter quality; and easily produce the inhomogeneous vibrations that cause of air-flow; if cleared up and take off filter core; must need shutdown, stopping production and loaded down with trivial details dismounting, debugging; workload is large and utilization rate of equipment and installations is low, and impact is normally produced.Therefore, need badly and solve the problems referred to above making further improvement and bring new ideas aspect filter core deashing, propose a kind of method that can realize filter core on-line regeneration.
Summary of the invention
The object of the invention is to solve the problems of the technologies described above, provide a kind of easy to operate, thorough deashing that can be adapted to high-temperature and high-pressure conditions lower filter for filtering the on-line regeneration method of filter element of duster of the flammable dirt of high temperature, improve filter efficiency and the life cycle of filter core.
For achieving the above object, the technical solution used in the present invention is: a kind of for filtering the on-line regeneration method of filter element of duster of the flammable dirt of high temperature, comprise the combustion with meagre oxygen link that on the Poor oxygen gas delivered to outside filter element of duster and filter element of duster, flammable dirt carries out, the oxygen content of described Poor oxygen gas is controlled at 2～17%.
Further, the reverse gas cleaning link of described combustion with meagre oxygen link and filter element of duster hockets.
Preferably, in described combustion with meagre oxygen link, Poor oxygen gas oxygen content is controlled at 2.5～13%.
Preferably, in described combustion with meagre oxygen link, Poor oxygen gas oxygen content is controlled at 3～9%.
Preferably, in described combustion with meagre oxygen link, Poor oxygen gas oxygen content is controlled at 4～7%.
Wherein, in described combustion with meagre oxygen link, the temperature of Poor oxygen gas is 100～900 DEG C.
Preferably, in described combustion with meagre oxygen link, the temperature of Poor oxygen gas is 400～600 DEG C.
Described Poor oxygen gas is delivered to filter element of duster below by the oxygen material conveying tube road with control valve.
Described Poor oxygen gas comprises oxygen and distribution, and described distribution is nitrogen and/or boiler gas.
Described oxygen material conveying tube is provided with heating device and/or pressure-raising device on road.
In described reverse gas cleaning link, the source of the gas of purge gas is a kind of or many a kind of mixing the in dust catcher gas purifying chamber output gas, nitrogen, boiler gas.
Described purge gas enters nozzle by blowing valve, and described nozzle inserts described filter core or covers described filter core top by Venturi tube.
On-line regeneration method for the filter element of duster that filters the flammable dirt of high temperature of the present invention adopts the equipment relating to comprise body, the deduster blowback system of deduster and comprises oxygen material conveying tube road, heating device and/or pressure-raising device and the Poor oxygen gas source of the gas with control valve, of the present invention for filtering the on-line regeneration method of filter element of duster of the flammable dirt of high temperature, comprise combustion with meagre oxygen and the reverse gas cleaning link of the filter element of duster hocketing, described Poor oxygen gas is delivered to filter element of duster bottom week side by the oxygen material conveying tube road with control valve, oxygen composition and the flammable dirt generation partial combustion reaction that is attached to filter element of duster outside in described Poor oxygen gas, make the combustible component burn to ash such as the carbon in the dust of filter core outside, the dust adhering to occurs loosening, now carry out reverse gas cleaning operation, the purge gas of high compression swelling can well blowback be disposed the dust stratification outside filter core, so repeated several times, the dust stratification of cartridge surface is thoroughly eliminated, realize the on-line regeneration of filter element of duster, and can be by control valve control Poor oxygen gas input quantity, ensure can not produce extensive burning and blast, guarantee the safety of deduster, method of the present invention has avoided traditional physics air-flow blowback to be difficult to thorough deashing realizing the present situation of filter core functional regeneration, also avoided needing in the disadvantageous situation of filter core deashing the troublesome operation of shutdown, dismounting filter element of duster, also the economic loss and the equipment loss that bring have thus been avoided, utilization rate of equipment and installations, life cycle are improved, ensure the high-quality filter efficiency of filter core, improved economic benefit, the oxygen content of described Poor oxygen gas is controlled at 2～17%, ensure can not produce extensive burning and blast, guarantee the safety of deduster, preferably, in described combustion with meagre oxygen link, Poor oxygen gas oxygen content is controlled at 2.5～13%, and security performance is higher, further, in described combustion with meagre oxygen link, Poor oxygen gas oxygen content is controlled at 3～9%, requires lowlyer for controlling, and can realize the partial combustion of long period and ensures the safety of deduster inside, in wherein said combustion with meagre oxygen link, the temperature of Poor oxygen gas is 100～900 DEG C and all can, the Poor oxygen gas of low temperature can be heated being delivered to filter core position, and burning generation heat can ensure the temperature stabilization of deduster inside preferably, when particularly in described combustion with meagre oxygen link, the temperature of Poor oxygen gas is 400～600 DEG C, the gas temperature that can ensure Poor oxygen gas and hot precipitator inside matches, avoid the gas entering to produce larger impact to deduster inside, and can not produce tar ingredients partial condensation damage equipment, it is convenient to control, the time of wherein said combustion with meagre oxygen and reverse gas cleaning link is than selecting according to the dust stratification situation of filter element of duster, preferably early stage combustion with meagre oxygen link be greater than the ash disposal preferably of described reverse gas cleaning link, wherein, described Poor oxygen gas comprises oxygen and distribution, described distribution is nitrogen and/or boiler gas, and source of the gas is taken conveniently, and uses boiler gas can improve the temperature of Poor oxygen gas, no longer need independent firing equipment, with low cost, the output setting in described oxygen material conveying tube road is positioned at filter element of duster below, described Poor oxygen gas is blowed the surface to described filter core, the particularly serious lower position of filter core dust stratification, can ensure to realize fast thorough deashing and the on-line regeneration of filter core outside targetedly, in described reverse gas cleaning link, the source of the gas of purge gas is a kind of or many a kind of mixing the in dust catcher gas purifying chamber output gas, nitrogen, boiler gas, similar with classical inverse blowing-out ash manipulation, realizes by controlling back-flushing valve, easy to use, easy to operate, described purge gas enters nozzle by blowing valve, described nozzle inserts described filter core or covers described filter core top by Venturi tube, when adopting Venturi tube to cover described filter core top, Venturi tube bottom is fixedly connected with the card that filter core is installed, described Venturi tube top connects respectively purge gas conveyance conduit and Purge gas output channel, the device of simultaneously collecting as blowback and filter gas, the gas that venturi tube structure feature enters while making blowback is by secondary pressurized, prevent gas backstreaming and whirlpool, contribute to improve blowback efficiency, and described Venturi tube can cover more filter core, control convenient, globality is strong.
The present invention is novel in design practical, break through the process technology limit of traditional reverse gas cleaning, utilization passes into the combustion with meagre oxygen technology that on Poor oxygen gas in filter element of duster and filter element of duster, flammable dirt carries out, and in conjunction with the measure of reverse gas cleaning, control the on-line regeneration that Poor oxygen gas oxygen content realizes filter core, can thoroughly remove the dust stratification dead angle of cartridge surface, improve filter element filtering efficiency and service life, aspect dust removal filter element deashing, start new approach.The present invention is reasonable in design, with low cost, and device security is reliable, the cycle of operation is long, the regenerability of filter core is high, and filter efficiency has improved more than 5%, and utilization rate of equipment and installations is high, node optimization, operating cost reduces more than 13%, has good value for applications.
figure of description
Below in conjunction with accompanying drawing, the present invention is further detailed:
Fig. 1 is the structural representation of embodiments of the invention one;
Fig. 2 is the structural representation of embodiments of the invention two.
Specific embodiment
Embodiment mono-
As shown in Figure 1, a kind of for filtering the on-line regeneration method of filter element of duster of the flammable dirt of high temperature, comprise the combustion with meagre oxygen link that on the Poor oxygen gas delivered to outside filter element of duster 1 and filter element of duster 1, flammable dirt carries out, and the reverse gas cleaning link of described combustion with meagre oxygen link and filter element of duster 1 hockets, described Poor oxygen gas is delivered to 1 below week of filter element of duster side by the oxygen material conveying tube road 3 with control valve 2, and the oxygen content of described Poor oxygen gas is controlled at 2%; In described combustion with meagre oxygen link, the temperature of Poor oxygen gas is 100 DEG C; The time of described combustion with meagre oxygen and reverse gas cleaning link, described Poor oxygen gas comprised oxygen and nitrogen than being 1:1; On described oxygen material conveying tube road 3, be provided with heating device 4, pressure-raising device 5, in described reverse gas cleaning link, the source of the gas of purge gas is dust catcher gas purifying chamber output gas, purge gas enters nozzle 7 by blowing valve 6 after supercharging is heated, and described nozzle 7 inserts described filter core 1.
Contrast test is that 1 of filter element of duster carries out reverse gas cleaning processing.
Embodiment bis-
As shown in Figure 2, in conjunction with Fig. 1 contrast, be a kind ofly with the difference of embodiment mono-: the oxygen content of described Poor oxygen gas is controlled at 3% for filtering the on-line regeneration method of filter element of duster of the flammable dirt of high temperature, described Poor oxygen gas comprises oxygen and nitrogen; In described combustion with meagre oxygen link, the temperature of Poor oxygen gas is 100 DEG C; In described reverse gas cleaning link, the source of the gas of purge gas is dust catcher gas purifying chamber output gas and nitrogen mixture body, and purge gas is inputted filter core 1 by the Venturi tube 8 that covers described filter core 1 top.
Described filter element of duster 1 filter efficiency improves 5.3%, and filter core extends 3 times 1 service time.
Embodiment tri-
For filtering the on-line regeneration method of filter element of duster for the flammable dirt of high temperature, be with the difference of embodiment mono-: the oxygen content of described Poor oxygen gas is controlled at 4%, described Poor oxygen gas comprises oxygen and boiler gas; In described combustion with meagre oxygen link, the temperature of Poor oxygen gas is 300 DEG C, and in described reverse gas cleaning link, the source of the gas of purge gas is dust catcher gas purifying chamber output gas and nitrogen mixture body.
Described filter element of duster 1 filter efficiency improves 5.9%, and filter core extends 3 times 1 service time.
Embodiment tetra-
For filtering the on-line regeneration method of filter element of duster for the flammable dirt of high temperature, be with the difference of embodiment mono-: the oxygen content of described Poor oxygen gas is controlled at 6%, wherein, described Poor oxygen gas comprises oxygen and nitrogen and boiler gas; In described combustion with meagre oxygen link, the temperature of Poor oxygen gas is 400 DEG C; The time of described combustion with meagre oxygen and reverse gas cleaning link is than being 2:1; In described reverse gas cleaning link, the source of the gas of purge gas is deduster boiler gas and nitrogen mixture body.
Described filter element of duster 1 filter efficiency improves 7.2%, and filter core extends 3.8 times 1 service time.
Embodiment five
For filtering the on-line regeneration method of filter element of duster for the flammable dirt of high temperature, be with the difference of embodiment mono-: the oxygen content of described Poor oxygen gas is controlled at 7%, wherein, described Poor oxygen gas comprises oxygen and boiler gas; In described combustion with meagre oxygen link, the temperature of Poor oxygen gas is 600 DEG C; The time of described combustion with meagre oxygen and reverse gas cleaning link is than being 1:3; In described reverse gas cleaning link, the source of the gas of purge gas is deduster boiler gas and nitrogen mixture body.
Described filter element of duster 1 filter efficiency improves 7.6%, and filter core extends 4.5 times 1 service time.
Embodiment six
For filtering the on-line regeneration method of filter element of duster for the flammable dirt of high temperature, be with the difference of embodiment mono-or two or three or four: the oxygen content of described Poor oxygen gas is controlled at 9%, in described combustion with meagre oxygen link, the temperature of Poor oxygen gas is 900 DEG C; The time of described combustion with meagre oxygen and reverse gas cleaning link is than being 1:2.
Examined, described filter element of duster 1 filter efficiency improves 6%, and filter core extends 3.2 times 1 service time.
Embodiment seven
For filtering the on-line regeneration method of filter element of duster for the flammable dirt of high temperature, be with the difference of embodiment mono-or two or three or four: the oxygen content of described Poor oxygen gas is controlled at 13%, in described combustion with meagre oxygen link, the temperature of Poor oxygen gas is 750 DEG C; The time of described combustion with meagre oxygen and reverse gas cleaning link is than being 1:4.
Examined, described filter element of duster 1 filter efficiency improves 4.7%, and filter core extends 3 times 1 service time.
Embodiment eight
For filtering the on-line regeneration method of filter element of duster for the flammable dirt of high temperature, be with the difference of embodiment mono-or two or three or four: the oxygen content of described Poor oxygen gas is controlled at 17%, in described combustion with meagre oxygen link, the temperature of Poor oxygen gas is 500 DEG C; The time of described combustion with meagre oxygen and reverse gas cleaning link is than being 1:2.
Examined, described filter element of duster 1 filter efficiency improves 7.4%, and filter core extends 3.9 times 1 service time.
The present invention is novel in design practical, break through the process technology limit of traditional reverse gas cleaning, utilization passes into the combustion with meagre oxygen technology that on Poor oxygen gas in filter element of duster 1 and filter element of duster 1, flammable dirt carries out, and in conjunction with the measure of reverse gas cleaning, control the on-line regeneration that Poor oxygen gas oxygen content realizes filter core 1, can thoroughly remove the dust stratification dead angle on filter core 1 surface, improve filter core 1 filter efficiency and service life, aspect dust removal filter element 1 deashing, start new approach.The present invention is reasonable in design, with low cost, and device security is reliable, the cycle of operation is long, the on-line regeneration performance of filter core 1 is high, and filter efficiency has improved more than 5%, and utilization rate of equipment and installations is high, node optimization, operating cost reduces more than 13%, has good value for applications.
Claims (10)
1. one kind for filtering the on-line regeneration method of filter element of duster of the flammable dirt of high temperature, it is characterized in that: it comprises the combustion with meagre oxygen link that on the Poor oxygen gas delivered to outside filter element of duster and filter element of duster, flammable dirt carries out, and the oxygen content of described Poor oxygen gas is controlled at 2～17%.
2. as claimed in claim 1 for filtering the on-line regeneration method of filter element of duster of the flammable dirt of high temperature, it is characterized in that: the reverse gas cleaning link of described combustion with meagre oxygen link and filter element of duster hockets.
3. as claimed in claim 1 or 2 for filtering the on-line regeneration method of filter element of duster of the flammable dirt of high temperature, it is characterized in that: in described combustion with meagre oxygen link, Poor oxygen gas oxygen content is controlled at 2.5～13%.
4. as claimed in claim 1 or 2 for filtering the on-line regeneration method of filter element of duster of the flammable dirt of high temperature, it is characterized in that: in described combustion with meagre oxygen link, Poor oxygen gas oxygen content is controlled at 3～9%.
5. as claimed in claim 1 or 2 for filtering the on-line regeneration method of filter element of duster of the flammable dirt of high temperature, it is characterized in that: in described combustion with meagre oxygen link, Poor oxygen gas oxygen content is controlled at 4～7%.
6. as claimed in claim 1 or 2 for filtering the on-line regeneration method of filter element of duster of the flammable dirt of high temperature, it is characterized in that: in described combustion with meagre oxygen link, the temperature of Poor oxygen gas is controlled at 100～900 DEG C.
7. as claimed in claim 1 or 2 for filtering the on-line regeneration method of filter element of duster of the flammable dirt of high temperature, it is characterized in that: in described combustion with meagre oxygen link, the temperature of Poor oxygen gas is controlled at 400～600 DEG C.
8. as claimed in claim 1 or 2 for filtering the on-line regeneration method of filter element of duster of the flammable dirt of high temperature, it is characterized in that: described Poor oxygen gas is delivered to filter element of duster below by the oxygen material conveying tube road with control valve, and described oxygen material conveying tube is provided with heating device and/or pressure-raising device on road.
9. as claimed in claim 1 or 2 for filtering the on-line regeneration method of filter element of duster of the flammable dirt of high temperature, it is characterized in that: described Poor oxygen gas comprises oxygen and distribution, described distribution is nitrogen and/or boiler gas.
10. as claimed in claim 1 or 2 for filtering the on-line regeneration method of filter element of duster of the flammable dirt of high temperature, it is characterized in that: in described reverse gas cleaning link, the source of the gas of purge gas is a kind of or many a kind of mixing the in dust catcher gas purifying chamber output gas, nitrogen, boiler gas.
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| CN201410202555.4A CN103961954A (en) | 2014-05-14 | 2014-05-14 | Online regeneration method of filter element of dust remover for filtering high-temperature combustible dust |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104645732A (en) * | 2015-01-30 | 2015-05-27 | 成都易态科技有限公司 | Regeneration method of gas filter element |
| CN104645731A (en) * | 2015-01-30 | 2015-05-27 | 成都易态科技有限公司 | Gas filter element anaerobic regeneration method |
| CN105779024A (en) * | 2016-05-24 | 2016-07-20 | 河南龙成煤高效技术应用有限公司 | High-temperature dust removal filtration equipment, high-temperature dust removal filtration system and continuous dust removal filtration method |
| CN105861077A (en) * | 2016-05-17 | 2016-08-17 | 河南龙成煤高效技术应用有限公司 | Dust removing and tar removing device and method for high-tar and high-dust high-temperature gas |
| CN105854432A (en) * | 2016-05-17 | 2016-08-17 | 河南龙成煤高效技术应用有限公司 | Compact type continuous filtering device for high-temperature precipitate mixed gas and filtering method thereof |
| CN105885957A (en) * | 2016-05-24 | 2016-08-24 | 河南龙成煤高效技术应用有限公司 | High-temperature dust collection filtering equipment, high-temperature dust collection filtering system and continuous dust collection filtering method |
| CN105879508A (en) * | 2016-05-24 | 2016-08-24 | 河南龙成煤高效技术应用有限公司 | Dust-cleaning device, dust-cleaning system composed of dust-cleaning device and dust-cleaning method thereof |
| CN105964406A (en) * | 2016-07-13 | 2016-09-28 | 河南龙成煤高效技术应用有限公司 | Electrical dust removal equipment and electrical dust removal system |
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| CN104645731A (en) * | 2015-01-30 | 2015-05-27 | 成都易态科技有限公司 | Gas filter element anaerobic regeneration method |
| CN104645732A (en) * | 2015-01-30 | 2015-05-27 | 成都易态科技有限公司 | Regeneration method of gas filter element |
| CN105854432B (en) * | 2016-05-17 | 2017-10-17 | 河南龙成煤高效技术应用有限公司 | The compact continuous filter unit and its filter method of the easy precipitate gaseous mixture of high temperature |
| CN105861077B (en) * | 2016-05-17 | 2019-01-25 | 河南龙成煤高效技术应用有限公司 | A kind of the dedusting coke removing appts and its method of the high-temperature gas that high tar is dusty |
| CN105861077A (en) * | 2016-05-17 | 2016-08-17 | 河南龙成煤高效技术应用有限公司 | Dust removing and tar removing device and method for high-tar and high-dust high-temperature gas |
| CN105854432A (en) * | 2016-05-17 | 2016-08-17 | 河南龙成煤高效技术应用有限公司 | Compact type continuous filtering device for high-temperature precipitate mixed gas and filtering method thereof |
| CN105879508B (en) * | 2016-05-24 | 2019-01-15 | 河南龙成煤高效技术应用有限公司 | The dust pelletizing system and its dust removal method that cleaner, the cleaner for the atm number gas that dustiness is 100-2000g/m3, tar content is 100-3000g/m3 form |
| CN105879508A (en) * | 2016-05-24 | 2016-08-24 | 河南龙成煤高效技术应用有限公司 | Dust-cleaning device, dust-cleaning system composed of dust-cleaning device and dust-cleaning method thereof |
| WO2017202279A1 (en) * | 2016-05-24 | 2017-11-30 | 河南龙成煤高效技术应用有限公司 | Dust-cleaning device, dust-cleaning system consisting of dust-cleaning device, and dust-cleaning method therefor |
| CN105885957A (en) * | 2016-05-24 | 2016-08-24 | 河南龙成煤高效技术应用有限公司 | High-temperature dust collection filtering equipment, high-temperature dust collection filtering system and continuous dust collection filtering method |
| CN105779024A (en) * | 2016-05-24 | 2016-07-20 | 河南龙成煤高效技术应用有限公司 | High-temperature dust removal filtration equipment, high-temperature dust removal filtration system and continuous dust removal filtration method |
| CN105885957B (en) * | 2016-05-24 | 2020-03-31 | 河南龙成煤高效技术应用有限公司 | High-temperature dust removal filtering equipment, high-temperature dust removal filtering system and continuous dust removal filtering method |
| US10981097B2 (en) | 2016-05-24 | 2021-04-20 | Henan Dragon Into Coal Technology Co., Ltd. | High-temperature dust removal and filtering apparatus, high-temperature dust removal and filtering system, and continuous dust removal and filtering method |
| CN105964406A (en) * | 2016-07-13 | 2016-09-28 | 河南龙成煤高效技术应用有限公司 | Electrical dust removal equipment and electrical dust removal system |
| CN106000649A (en) * | 2016-07-13 | 2016-10-12 | 河南龙成煤高效技术应用有限公司 | Electric precipitation equipment for coal gas containing tar and dust |
| CN107008047A (en) * | 2017-05-31 | 2017-08-04 | 河南龙成煤高效技术应用有限公司 | A kind of parallel flow filter system and filtering technique |
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Application publication date: 20140806 |
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