CN2218182Y - Pneumatic dust discharger by blast furnace residued gas pressure - Google Patents
Pneumatic dust discharger by blast furnace residued gas pressure Download PDFInfo
- Publication number
- CN2218182Y CN2218182Y CN 95207152 CN95207152U CN2218182Y CN 2218182 Y CN2218182 Y CN 2218182Y CN 95207152 CN95207152 CN 95207152 CN 95207152 U CN95207152 U CN 95207152U CN 2218182 Y CN2218182 Y CN 2218182Y
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- gas
- ash
- ball valve
- blast furnace
- valve
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Abstract
The utility model relates to a dust conveying device of a cloth bag dust remover for blast furnace gas, comprising a gas dust conveying pipeline, a cloth bag dust remover, an intermediate bin, a large dust bin, a control valve and a nitrogen pipeline. With the self-pressure of blast furnace gas, the utility model conveys the blast furnace gas to the concentrated large dust bin by using net blast furnace gas as a carrier. The gas comes back to a low-voltage gas system after secondary filtering and decompression, and dust deposited in the large dust bin is discharged in a moistened form after entering a humidifying mixing apparatus, so that pneumatic dust conveying by gas excess pressure is formed. The utility model does not need energy conveyed externally, and has short process, small building area occupation, and low operating and capital cost without environment pollution.
Description
The utility model is about the unloading of blast furnace gas cloth bag dedusting, ash conveying device.
At present, the unloading of blast furnace gas cloth bag dedusting, defeated grey aspect, generally adopt mechanical system or mechanical pneumatic associated form both at home and abroad, be deposited on the ash of sack cleaner lower cone, by a cover air-lock device, fall into worm conveyor, ash is transplanted in the cone pump goes, utilize pressurized air again, respectively the ash conveying pipe by separately, be transported in the concentrated big grey storehouse, be provided with some filter bags at big Hui Cang top.Enter after pressurized air is filtered in the atmosphere, be deposited on the ash in the big grey storehouse, behind the one cover biaxial rneader of bottom, be discharged on the transport trolley, be transported to outside the factory.
There is following shortcoming in mechanical ash conveying:
A, long flow path, link are many: failure rate of machinery height, revolving plow reclaimer and worm conveyor often occur changeing motionless, stuck phenomenon, influence ordinary production.Worm conveyor is in the periodical operation process, because the cold conditions and the hot temperature difference are bigger, poor sealing performance causes flying dust more, severe operational environment.
The ash of b, sack cleaner lower cone, temperature are up to 160 ℃; Granularity is tiny, and 200 orders～300 purpose ashes account for more than 60%; True specific gravity is big, and metal Ferrum content reaches 40%.Known from institute, when ash deposition to sufficiently high the time because action of gravity, the clearance between soot particle of grey surface pressure and soot particle diminish, degree of compactness increases, the frictional force between soot particle increases, therefore unload often arch camber in the grey process, the ash that is unable to come down often needs artificial rapping.
C, equipment are many, and floor space is big, power consumption is many, and the working cost height owing to occupy more space, has increased capital cost.
The purpose of this utility model is exactly for overcoming above-mentioned shortcoming, specific design a kind of coal gas overbottom pressure pneumatic ash conveying plant.
Fig. 1 is the synoptic diagram of the utility model ash conveying device.The key that realizes its purpose is to unload grey pre-treatment, it comprises sack cleaner lower cone 1 and middle grey storehouse 4, flange with maintenance ball valve 2 and pneumatic baiting valve 3 between lower cone 1 and the middle grey storehouse 4 links, and pneumatic baiting valve 3 is grey storehouses 4 in the middle of the ash in the control lower cone 1 enters.Be connected by ball valve and pipeline between lower cone 1 and the middle grey storehouse 4.By the keying of pneumatic ball valve 8, the degree of filling of control ash in grey storehouse 4, centre.The pre-treatment of ash is finished in lower cone 1 and middle grey storehouse 4, and preprocessing process is accompanied by and unloads grey process and carry out simultaneously.Unload before the ash, at first open ball valve 10, no hydro-thermal nitrogen sees through the bottom that gasification board 6 is pressed into lower cone 1 continuously, makes the ash in the lower cone 1 form bulk district, a part in the bottom.After opening pneumatic baiting valve 3, bulk ash just falls in the middle grey storehouse 4 smoothly.Gasification board 6 is φ 150 circular microwell plates of being made by stupalith, has installed four in the bottom of lower cone 1, divides two layers of layout, and is symmetrical in twos, two interlamellar spacings 500～700.After the ash in the grey storehouse 4, centre is filled to a certain degree, close pneumatic ball valve 8 and pneumatic baiting valve 3, open ball valve 11, no hydro-thermal nitrogen sees through gasification board 7, the grey degree of depth fluidisation in the middle of making in the grey storehouse 4.7 and 6 is identical, and the bottom in grey storehouse 4 has been installed two in the centre, each other symmetry.After the ash pre-treatment fully, open pneumatic ball valve 5, ash just successfully falls into ash conveying pipe 12, is transferred coal gas and takes away.Link together by a Y-tube of making by special high-abrasive material between pneumatic ball valve 5 and the ash conveying pipe 12.Each cloth bag chamber unload grey pre-treatment, in parallel with ash conveying pipe 12 respectively.
It is in order to reduce the frictional force between soot particle, to improve the flowability of ash that the present invention adopts pretreated purpose.As everyone knows, when ash deposited to high charge level meter L1 in lower cone 1, because the action of gravity of grey surface pressure and ash, the clearance between soot particle diminished, and more toward the bottom, degree of compactness increases, and frictional force to each other increases, therefore, and arch camber easily.After blasting nitrogen from gasification board 6, the distance between soot particle increases, and frictional force reduces, and become bulk.When continuing to blast nitrogen, grey particle is setting in motion, thereby improved grey flowability, guaranteed to unload grey process and carried out smoothly.
High pressure purified gas before carrying coal gas from the reducing valve group, pressure 0.18MPa, through after switching ball valve 16, coal gas is depressurized valve 15 and is adjusted to the conveying gas pressure, be adjusted to required conveying tolerance through Hand-operated butterfly valve 14 again, Pneumatic butterfly valve 13 is master switchs of carrying source of the gas.Pressure in the general ash conveying pipe 12 can be realized the malleation conveying a little less than the pressure in the grey storehouse 4, centre.Pneumatic ash conveying is the two phase flow process of a complexity, because technological operation and unload grey pretreated unstable, ash gas is little when bigger than the time, the phase concentrations of carrying is fast changing, therefore, the following grey speed that is entered ash conveying pipe 12 by grey storehouse 4, centre is most important, and following grey excessive velocities causes plugging easily.And following grey speed and grey severe, the ash discharging pipe bore, and middle grey storehouse 4 is relevant with the pressure difference of ash conveying pipe 12.Pressure difference is the important factor that restriction is carried.It is comparatively suitable that pressure difference is controlled in the scope of 0.007～0.01MPa.But in actual mechanical process, often initial pressure reduction is bigger, and following grey speed is fast.For fear of plugging, the pressure interlock protection of pneumatic ball valve 5 and ash conveying pipe 12 should be set.When the gas pressure in the ash conveying pipe 12 was elevated to dangerous values, pneumatic ball valve 5 was just closed automatically, otherwise pneumatic ball valve 5 is opened.Ash conveying pipe is φ 159 * 8 seamless tubes, and bent tube section is made by high-abrasive material, and bending radius must not be less than 10 times of pipe diameters.
Ash is transported in the big grey storehouse 24 by coal gas by ash conveying pipe 12.Ball valve 23 is cut-out ball valves of ash pipeline.The diameter phi 4000 in big grey storehouse 24, high 20000mm.Most of ash here settles down, and a spot of ash of carrying secretly filters by secondary purifier 25.Secondary purifier 25 is installed in the top in big grey storehouse 24, in establish some of pulse bags, it filters and deashing is followed and failed grey process and carry out simultaneously.Cleaning cycle can be set according to practical situation.The pulse source of the gas is the dry nitrogen of 0.4MPa.Because defeated ash manipulation is intermittently to carry out, every day secondary, therefore, the replacing of cloth bag can utilize defeated grey gap to carry out.Dust content of gas after the filtration is not more than 10mg/m
3, pass through check valve 28 again, get back to again after the reducing valve group in the low-pressure gas system.Electrical ball valve 27 and manual ball valve 29 are cut-out equipment.Diffuse valve 26 and be provided with in order to prevent system overpressure diffuse valve automatically.
In order effectively will to carry coal-gas recovering in low-pressure gas system, the purified gas pressure behind the secondary purifier 25 should be greater than low-pressure gas system pressure 0.012MPa, thus the pressure of ash-transmission system to fall be the important factor that realizes coal-gas recovering.According to checking of Theoretical Calculation and practical data, H falls in the pressure of ash-transmission system should comprise that H1 falls in the pressure of ash conveying pipe and H2 falls in pulse bag pressure, and wherein H1 is 0.045～0.145MPa, H
2Be 0.0015～0.002MPa, total pressure drop H is 0.0465～0.147MPa.Carrying the coal gas initial pressure is 0.18Mpa, overcome the total pressure drop H of system after, surplus pressure is much larger than low-pressure gas system pressure 0.012MPa.Still need 0, the 18MPa gas pressure is by the reducing valve 15 required transfer pressure that reduces pressure for this reason.
The ash that is deposited in the big grey storehouse 24 is done, for preventing reentrainment of dust in the ash discharge process, an efficient wetting stirrer 30 is set below big grey storehouse 24, between big grey storehouse 24 and the wetting stirrer 30, one stand lock balloon valve 31 and a revolution feeding machine 32 have been installed, ash discharge front opening ball valve 33, dry nitrogen sees through gasification board 34, blast the feed opening place in big grey storehouse 24, effectively solved the problem of humidification inequality, for preventing emptying and guaranteeing to have in the big grey storehouse 24 enough ash positions, be provided with low material level warning L3.
The no hydro-thermal nitrogen that gasification board 6,7,34 is required is after nitrogen drying device 22 dryings, through 21 decompressions of nitrogen relief valve, again by supplying with after nitrogen heater 20 heating, by nitrogen drying device 22 dried another road nitrogen, directly supply with secondary purifier 25 without decompression, make the pulse source of the gas.When blast furnace changeed normal pressure, exsiccant nitrogen as defeated grey source of the gas, was opened automatically and is closed pneumatic ball valve 16 when switching ball valve 19 after relief valve 18 decompression.
With 2100m
3The blast furnace gas cloth bag dedusting facility is an example, clear height before it carries source of the gas from the reducing valve group is pressed coal gas, gas pressure is 0.18～0.2MPa, after relief valve 15 decompressions, pressure is reduced to 0.13～0.15MPa, open pneumatic ball valve 5, pre-treatment is grey completely, and grey storehouse 4 falls into ash conveying pipe 12 from the centre, generally speaking, pressure in the middle grey storehouse 4 is a little more than the gas pressure in the ash conveying pipe 12, ash is transferred coal gas and takes away, and the coal gas that is carrying ash enters after the big grey storehouse 24 through manual ball valve 23, and ash just is deposited in the bottom in big grey storehouse 24.The raw gas of carrying a small amount of ash secretly is up, passes the pulse bag of secondary purifier 25 and is cleaned.Coal gas after the purification, because the drag losses of friction loss and secondary purifier 25, gas pressure is reduced to 0.02～0.012MPa, enters low-pressure gas system after the reducing valve group through electrical ball valve 27, check valve 28, manual ball valve 29, thereby has finished defeated grey task.When utilizing the defeated ash of nitrogen, then diffuse to atmosphere by diffusing valve 26.The supplementary means of alternative transport source of the gas when the defeated ash of nitrogen is blast furnace commentaries on classics normal pressure, pneumatic ball valve 16 and pneumatic ball valve 19 are provided with the pressure interlocking.
Before sack cleaner unloads ash, at first open manual ball valve 10 and feed nitrogen, nitrogen pressure be～0.207MPa, and 70～80 ℃ of temperature see through gasification board 6, and exsiccant nitrogen is dispersed in the grieshoch and goes, and makes bulk district of formation, feed opening place, and ash is easy to flow.At this moment, unloading ash manipulation has two kinds of methods, selects according to practical situation for the operator:
One, when the blast furnace roof pressure is unstable, and when material level is in high charge level L1 in the lower cone 1, open electrical ball valve 2 and pneumatic baiting valve 3, grey storehouse 4 in the middle of the ash gravitate falls into, open manual ball valve 11 simultaneously, the hot nitrogen of exsiccant sees through gasification board 7 and blasts in the middle grey storehouse 4, and ash is by further fluidisation.Full level for grey storehouse 4 in the middle of controlling, open pneumatic ball valve 8 and manual ball valve 9 is all pressed, according to time-program(me), close pneumatic ball valve 8 and pneumatic baiting valve 3, after the time-delay, open pneumatic ball valve 5, under the promotion of grey storehouse 4, centre and ash conveying pipe 12 pressure differences, ash just falls into ash conveying pipe 12 smoothly, because initial pressure reduction is bigger, the gas phase dust concentration in the ash conveying pipe 12 increases, the gas gray scale is about 1: 20, gas pressures raise rapidly in this moment ash conveying pipe 12, after be tending towards a numerical value stably gradually, its value is 0.7～1.0MPa.After the ash in the grey storehouse 4, centre was unsnatched, defeated grey gas pressure was reduced to blank pipe pressure again, closes pneumatic ball valve 5, carry out unloading ash the second time again, move in circles, grey potential drop is ended to hanging down material level L2 in lower cone 1, close electrical ball valve 2 successively, manual ball valve 10, manual ball valve 11.Carry out the defeated ash of unloading of next sack cleaner again, treat the defeated ash of each fly-ash separator one time after, close Pneumatic butterfly valve 13, electrical ball valve 27.
Its two: when the blast furnace roof pressure is stablized, and when material level is in high charge level L1 in the lower cone 1, open pneumatic ball valve 5, pneumatic baiting valve 3, electrical ball valve 2 loose ashes successively by working order and just fall into ash conveying pipe 12 continuously, being transferred coal gas takes away, grey potential drop in lower cone 1 is ended to hanging down material level L2, close electrical ball valve 2 successively, pneumatic baiting valve 3, pneumatic ball valve 5, manual ball valve 10, manual ball valve 11.Carry out next cloth bag again and remove the defeated ash of unloading of device.After treating that each fly-ash separator is failed grey one time, close Pneumatic butterfly valve 13, electrical ball valve 27.
The filtration of secondary purifier 25 and deashing are followed defeated grey process and are carried out simultaneously.The ash discharge humidification in big grey storehouse 24 will be according to giving birth to wide operation discharging regularly.
By above-mentioned example, the present invention makes full use of self coal gas, has successfully realized the blast-furnace top gas recovery Pneumatic ash conveying.Can save the energy and investment, eliminate reentrainment of dust, reach the purpose of carrying out production strictly in line with rules and regulations.
Description of drawings:
Fig. 1-blast-furnace top gas recovery Pneumatic ash conveying system diagram
1-sack cleaner lower cone
2-electronic maintenance ball valve
3-pneumatic baiting valve
4-middle grey storehouse
5-pneumatic ball valve
6,7,34-gasification board
8-pneumatic ball valve
9-manual ball valve, be used for the maintenance
10-manual ball valve
11-manual ball valve
12-ash conveying pipe
13-Pneumatic butterfly valve, conveying source of the gas master switch.
14-Hand-operated butterfly valve is regulated and is carried tolerance.
15-relief valve, adjusting gas pressure.
16-pneumatic ball valve, be used for switch carrying source of the gas.
18-relief valve, adjusting nitrogen pressure
19-pneumatic ball valve is used for switching the conveying source of the gas.
17-conveying coal gas measuring diaphragm
20-nitrogen heater
21-nitrogen relief valve
22-nitrogen drying device
23-manual ball valve, be used to cut off ash conveying pipe
24-big grey storehouse
25-secondary purifier, some of interior dress pulse bags.
26-diffuse valve
27-electrical ball valve
28-check valve, prevention inverted draft.
29-manual ball valve
30-wetting stirrer
31-pneumatic ball valve, be used to lock gas, maintenance.
32-revolution cloth valve
33-manual ball valve
L1-high-order level gage
L2-low level level gage
L3-material level is reported to the police.
Claims (1)
1, a kind of Blast Furnace Gas Pressure Pneumatic Ash Device comprises coal gas ash conveying pipe system, and sack cleaner, middle Hui Cang, big grey storehouse, control valve and nitrogen pipeline is characterized in that:
A, big grey storehouse and middle grey storehouse link by ball valve and coal gas ash conveying pipe, and coal gas is through reducing valve, control valve input channel;
Two-layer gasification board is installed in the lower cone bottom in b, sack cleaner, middle Hui Cang and big grey storehouse, and gasification board links by ball valve and nitrogen pipeline;
Be connected by ball valve, baiting valve and pipeline between c, sack cleaner lower cone and the intermediate bin;
The nitrogen drying device drying that d, grey pre-treatment are used after heater heats, is supplied with nitrogen pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95207152 CN2218182Y (en) | 1995-04-04 | 1995-04-04 | Pneumatic dust discharger by blast furnace residued gas pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95207152 CN2218182Y (en) | 1995-04-04 | 1995-04-04 | Pneumatic dust discharger by blast furnace residued gas pressure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2218182Y true CN2218182Y (en) | 1996-01-24 |
Family
ID=33858878
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95207152 Expired - Lifetime CN2218182Y (en) | 1995-04-04 | 1995-04-04 | Pneumatic dust discharger by blast furnace residued gas pressure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2218182Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101708406B (en) * | 2009-12-30 | 2011-08-31 | 中冶南方工程技术有限公司 | Group control method of blast furnace gas cloth bag dust catcher system for pipeline dust conveying |
| CN104515138A (en) * | 2014-12-24 | 2015-04-15 | 山西蓝天环保设备有限公司 | Deslagging device applicable to coal powder industrial boiler |
| CN105597455A (en) * | 2016-03-09 | 2016-05-25 | 河北钢铁股份有限公司承德分公司 | Device and method for disposing dust bin blockage of blast-furnace gas bag-type dust remover |
| CN106636507A (en) * | 2016-07-30 | 2017-05-10 | 柳州钢铁股份有限公司 | Blast furnace gas dry method bag type dust removing mechanical type pressure dust unloading process and device thereof |
| CN107143862A (en) * | 2017-06-27 | 2017-09-08 | 淮安中科环保电力有限公司 | Circulating fluid bed garbage furnace low temperature superheater ash conveying device and method |
| CN107513592A (en) * | 2017-08-15 | 2017-12-26 | 广西华锐钢铁工程设计咨询有限责任公司 | Grey technique and device are unloaded in mechanical totally-enclosed with pressure |
-
1995
- 1995-04-04 CN CN 95207152 patent/CN2218182Y/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101708406B (en) * | 2009-12-30 | 2011-08-31 | 中冶南方工程技术有限公司 | Group control method of blast furnace gas cloth bag dust catcher system for pipeline dust conveying |
| CN104515138A (en) * | 2014-12-24 | 2015-04-15 | 山西蓝天环保设备有限公司 | Deslagging device applicable to coal powder industrial boiler |
| CN105597455A (en) * | 2016-03-09 | 2016-05-25 | 河北钢铁股份有限公司承德分公司 | Device and method for disposing dust bin blockage of blast-furnace gas bag-type dust remover |
| CN106636507A (en) * | 2016-07-30 | 2017-05-10 | 柳州钢铁股份有限公司 | Blast furnace gas dry method bag type dust removing mechanical type pressure dust unloading process and device thereof |
| CN106636507B (en) * | 2016-07-30 | 2019-09-10 | 柳州钢铁股份有限公司 | Blast furnace gas dry bag-type dusting machinery formula pressure unloads grey technique and its device |
| CN107143862A (en) * | 2017-06-27 | 2017-09-08 | 淮安中科环保电力有限公司 | Circulating fluid bed garbage furnace low temperature superheater ash conveying device and method |
| CN107513592A (en) * | 2017-08-15 | 2017-12-26 | 广西华锐钢铁工程设计咨询有限责任公司 | Grey technique and device are unloaded in mechanical totally-enclosed with pressure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Beijing Shougang Co., Ltd. Assignor: Capital Iron & Steel General Company Contract fulfillment period: In April 4, 2005, 3 years, the patent expires Contract record no.: 200210042 Denomination of utility model: Blast furnace gas residual pressure pneumatic ash conveying device Granted publication date: 19960124 License type: Pai Ta Record date: 2002.6.3 |
|
| LIC | Patent licence contract for exploitation submitted for record |
Free format text: LICENCE; TIME LIMIT OF IMPLEMENTING CONTACT: 2005.4.4, 3 YEARS, EXPIRATION OF PATENT RIGHT Name of requester: BEIJING SHOUDU STEEL CO., LTD. Effective date: 20020603 |
|
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |