CN101837316A - Vertical drying grind ring flow production energy saving and emission reduction process and air distribution equipment thereof - Google Patents
Vertical drying grind ring flow production energy saving and emission reduction process and air distribution equipment thereof Download PDFInfo
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- CN101837316A CN101837316A CN200910061263A CN200910061263A CN101837316A CN 101837316 A CN101837316 A CN 101837316A CN 200910061263 A CN200910061263 A CN 200910061263A CN 200910061263 A CN200910061263 A CN 200910061263A CN 101837316 A CN101837316 A CN 101837316A
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- air distribution
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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
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Abstract
The invention discloses a vertical drying grind ring flow production energy saving and emission reduction process and air distribution equipment thereof. The process flow is as follows: the high-temperature hot air produced by a hot-blast stove enters into a vertical grind through a hot air supply pipe, enters into a dust collecting bag through a material transmission pipe, and then enters into an induced draft fan to be divided into two paths; and in one path, the high-temperature hot air is discharged through a connected chimney, and in the other path, the high-temperature hot air returns through a connected exhaust gas returning pipe. The process flow is characterized in that a special high-temperature cyclone air distribution equipment is additionally arranged on the hot air supply pipe; the outlet of the exhaust gas returning pipe is connected with the high-temperature cyclone air distribution equipment; part of tail gas returns to the hot air supply pipe, and enters into the grind after air distribution; the special high-temperature cyclone air distribution equipment comprises the hot air supply pipe, and the outer wall of which is provided with a rotational flow volute; and n numbered evenly distributed air inlets are arranged on the hot air supply pipe in the rotational flow volute. The invention solves the problems that a two-step air distribution way is adopted in the existing process, energy consumption is high, temperature difference of the hot air supply pipe is larger and a great quantity of heat loss because refractory lining is easily damaged and the like; and the invention can be widely used in building materials and chemical industries.
Description
(1) technical field: the present invention relates to the technological improvement of drying materials system in the industrial production, particularly a kind of vertical drying grinding ring stream is produced energy-saving and emission-reducing technique and air distribution device thereof.
(2) background technology: the existing vertical drying grinding ring stream technological process of production is seen Fig. 2, and this technology is used widely aborning, is characterized in:
1, import heat (hot flue gas) oven dry material in grinding process, moisture content is many more, and it is just many more to infeed heat, and promptly exhaust gas volumn is also many more.
2, go out the product of qualified fineness by pneumatic separating, because the grinding machine inner chamber is a certain value, so after granularity, the proportion of product were determined, the tolerance of circulation also was a fixed number in the mill, the exhaust gas volumn that infeeds in the system is many more, and the exhaust gas volumn of discharge is also many more.
3, for guaranteeing the intensity and the life-span of abrasive article in the mill, go into to grind flue-gas temperature necessary＜300 ℃.
4, be energy savings, adopt circle stream technology, the tail gas that is about to the chimney discharge returns a part, and the high-temperature flue gas of confessing with stove is mixed and joined, to satisfy air quantity and the wind-warm syndrome into mill.
5, the tail gas of Pai Chuing must be more than dew point, and generally designing wind-warm syndrome is about 90～95 ℃.
From These characteristics as seen, after heating load and exhaust temperature were determined, it was high more to infeed flue-gas temperature, and the heat supply flue gas is just few more, and the tolerance of returning is big more, tolerance that tail gas is taken out of and heat few more (demonstration of seeing Appendix), and vice versa.
Be subjected to the constraint of distribution technology, traditional handicraft is after earlier being mixed with about 500 ℃ with air the furnace high-temperature flue gas, mixes and is fitted on 300 ℃ to be lowered to mill with returning tail gas again, claims two to go on foot the distribution methods; Because wind speed is a certain value in the mill, must strengthen the exhaust emissions amount simultaneously, join air to 500 ℃ a large amount of air at room temperature of being allocated at the high-temperature flue gas of coming out of the stove (general＞1000 ℃), participate in circulation back temperature rise to 90～95 ℃ and all discharge out of the furnace again, wasted a large amount of heat energy.If can will come out of the stove high temperature (＞1000 ℃) flue gas all with return gas mix be fitted on＜300 ℃ go into to grind, so just save the above-mentioned temperature rise hear rate of allocating air into, we claim one to go on foot the distribution method.
Existing on the other hand gas-distribution pipe 2 (comprising above-mentioned flue gas recurrent canal) all is to adopt directly to be connected (referring to Fig. 1) with the mode of heat supply airduct 1 fork-join, the problem that this connected mode is brought is: after 1. distribution cold wind enters the heat supply airduct, even to inhomogeneous cooling in the short distance of heat supply airduct, make the part of heat supply airduct produce overheated, damage, thereby system's heat loss is increased, and energy consumption increases; 2. because the hot-blast stove leaving air temp is higher, before mixing, the whole piece pipeline must be done fire-resistant and INSULATION DESIGN by high-temperature pipe, the cost height; 3. temperature inequality in the pipeline, refractory lining very easily damages and causes heat to lose in a large number; 4. under the short situation of pipeline, uneven heating is even, influence product quality in addition fire burns; 5. necessary multistage air distribution under the bigger operating mode of the temperature difference seriously reduces system effectiveness.
(3) summary of the invention: it is big because of two step air distribution energy consumptions that purpose of the present invention will solve existing vertical drying grinding ring stream production technology exactly, CO
2Discharge capacity is big, and two steps and above distribution will be brought a large amount of oxygen into, bring problems such as potential safety hazard, realizes a step distribution, solves the heat supply airduct problem of damage easily simultaneously, provides a kind of vertical drying grinding ring stream to produce energy-saving and emission-reducing technique and air distribution device thereof.
Concrete scheme of the present invention is: vertical drying grinding ring stream is produced energy-saving and emission-reducing technique, at first hot-blast stove is produced high-temperature hot-air and is entered vertical mill through the heat supply airduct, behind the heating, drying material, hot blast carries material and enters bagroom through Material pipeline, material after the bagroom collection is dry and levigate is a product, discharge tail gas simultaneously, tail gas enters air-introduced machine through discharge pipe, the air-introduced machine exhaust outlet divides two-way, one the tunnel connects chimney to effluxing, another road connects the flue gas recurrent canal and returns distribution, it is characterized in that: on the heat supply airduct of the hot-blast stove port of export, have additional a special high temperature whirlwind air distribution device, the outlet of above-mentioned flue gas recurrent canal connects high temperature whirlwind air distribution device, and partly tail gas returns the heat supply airduct, all use to return gas and heating stove is exported high-temperature gas be assigned to＜300 ℃ go into mill.
Be used for vertical drying grinding ring stream among the present invention and produce the special high temperature whirlwind air distribution device of energy-saving and emission-reducing technique, include the heat supply airduct, it is characterized in that: the outer wall at the heat supply airduct is equipped with an eddy flow spiral case, offers the air inlet that n surrounding tube wall cloth put on the heat supply airduct in the eddy flow spiral case.Enter heating tube along the approximate isobaric shape of girth and evenly mix to guarantee to return tail gas with high-temperature flue gas.
The eddy flow spiral case is Archimedes spiral shape or logatithmic spiral shape described in the high temperature whirlwind air distribution device of the present invention.Can certainly be the eddy flow spiral case of other shape, as the biasing spiral case.
Open the air inlet on the heat supply airduct described in the high temperature whirlwind air distribution device of the present invention, rounded hole or axial arranged kidney shape hole can certainly be the air inlets of other different shape.
Design principle of the present invention is:
1. the characteristics of vertical drying grinding ring stream production technology (see figure 2) are:
(1) goes out the product of qualified fineness by pneumatic separating.Product granularity and respective relationships are:
d
p=CV
2, in the formula: d
p-average grain diameter, wind speed in the V-mill
ρ
0-material proportion; G-acceleration of gravity
Because circulation area is a fixed number in the mill, so after proportion, the fineness of material are determined, go into to grind tolerance Q
Go into millIt also is a fixed number.
(2) adhere to moisture content W in the material usually, needing to import desiccant heat in the process of grinding is hot-blast stove supplying high temperature exhaust gas volumn Q
Cigarette, enter the exhaust gas volumn Q of grinding machine in the streaming system at circle
Go into mill=Q
Cigarette+ Q
Return(returning exhaust gas volumn) ... 1.; Because W can change the heat of introducing, i.e. exhaust gas volumn Q between W=0～rated value
CigaretteAlso will be from Q
Cigarette～rated value changes, and as seen, moisture content W is many more, exhaust gas volumn Q from 1. formula
CigaretteBig more, Q
ReturnFew more; Otherwise it is few more to work as W, flue gas Q
CigaretteFew more, Q
ReturnBig more; Q
Cigarette=0 o'clock, Q
Go into mill=Q
Return
3. the water vapour Q of evaporation during grinding is dried
WaterWill with the flue gas Q that infeeds
CigaretteDischarge system in the lump, finish baking operation; Ignore the factor of leaking out, the tail gas amount Q of discharge
Tail=Q
Cigarette+ Q
Water... 2..
This flow process has a necessary condition: 1. Q
Go into millTemperature t
Go into millNecessary＜300 ℃ hardness and life-span with abrasive article in the assurance mill.2. exhaust emissions temperature t
TailBe higher than dew point, usually t
Tail=85～95 ℃.
2. heating tube flue-gas temperature t
CigaretteInfluence to heating efficiency:
Ignore the heat radiation and the factor of leaking out, heating efficiency is
... 3., from 3. formula
At t
TailUnder certain condition, t
CigaretteHigh more η is big more; The high temperature flue-gas temperature of coming out of the stove is established t
StoveBe 1100 ℃, t
CigaretteBe 500 ℃, t
Tail=90.7 ℃, t
StoveWith t
CigaretteEfficient difference Δ η be:
Energy-saving potential is very considerable.
Be subjected to the constraint of high temperature distribution technology, existing popular two step distributions promptly earlier go out kiln gas t with high temperature
StoveAllocate room temperature t into
Join=± 20 ℃ air Q
Join, make t
Cigarette=500～600 ℃, sneak into Q again
Return, make Q
Go into mill=Q
Stove+ Q
Return, and t
Go into mill=300 ± 30 ℃.The invention reside in and adopt high temperature one step distribution method Q
ReturnWith t
StoveBe assigned to the Q that satisfies into mill tolerance and temperature
Go into mill, be about to Q
Go into mill=Q
Stove+ Q
Return, make Q
Join=0, save two and go on foot distribution, then Q
JoinIncreasing to the heat that discharges out of the furnace after 90.7 ℃ from 20 ℃ will save, and energy-saving effect is apparent, can also reduce a large amount of CO simultaneously
2Discharge capacity.
Technology of the present invention also has the following advantages: defeated smoke pipe holds temperature and is reduced to 300 ℃ by 500 ℃, and manufacturing cost and radiation loss all reduce, and the life-span prolongs; When being used for coal-grinding or other explosive materials, because of Q
Join=0, contain O in the flue gas
2Amount significantly is reduced to inner flue gas of the stove and contains O
2Measure closely, guarantee the safety in production of system.
The high temperature whirlwind air distribution device that adopts among the present invention has the following advantages: the flue gas recurrent canal is docked with the heat supply airduct with preferred mode, realize a step distribution; 2. make and return tail gas and evenly enter cold air in the high-temperature pipe to the protective effect of inside pipe wall from the high-temperature pipe periphery, the fire-resistant rank of pipeline is only pressed the temperature design behind the air distribution behind the air distribution, greatly reduces manufacturing cost; 3. even because of air distribution, can be under the bigger operating mode of the temperature difference, distribution cooling can not burn out the pipeline after the distribution, and significantly shorten gas distribution pipeline, has guaranteed product quality and safety, has reduced operating cost.
(4) description of drawings:
Fig. 1 is a distribution access way schematic diagram of the prior art;
Fig. 2 is existing vertical drying grinding ring stream technological process of production schematic diagram;
Fig. 3 is a process flow diagram of the present invention;
Fig. 4 is a high temperature whirlwind air distribution device structural representation of the present invention;
Fig. 5 is the A-A view of Fig. 4.
Among the figure: 1-heat supply airduct, 2-gas-distribution pipe, 3-hot-blast stove, the vertical mill of 4-, 5-Material pipeline, 6-bagroom, 7-discharge pipe, 8-air-introduced machine, 9-chimney, 10-flue gas recurrent canal, 11-high temperature whirlwind air distribution device, 12-eddy flow spiral case, 13-air inlet.
(5) specific embodiment:
Vertical drying grinding ring stream of the present invention is produced the energy-saving and emission-reducing technique flow process and is: referring to Fig. 3, at first hot-blast stove 3 is produced hot blast and is entered vertical mill 4 through heat supply airduct 1, behind the heating, drying material, hot blast carries material and enters bagroom 6 through Material pipeline 5, bagroom 6 is collected dried material and is gone out product, discharge tail gas simultaneously, tail gas enters air-introduced machine 8 through discharge pipe 7, air-introduced machine 8 exhaust outlets divide two-way, one the tunnel connects chimney 9 outwards discharges, another road connects flue gas recurrent canal 10 and returns, particularly: on the heat supply airduct 1 of hot-blast stove 3 ports of export, have additional a special high temperature whirlwind air distribution device 11, the outlet of above-mentioned flue gas recurrent canal 10 connects high temperature cyclone 11, and partly tail gas returns heat supply airduct 1.
The concrete structure of special high temperature whirlwind air distribution device 11 described in the above-mentioned technology of the present invention, referring to Fig. 4,5, include heat supply airduct 1, outer wall at heat supply airduct 1 is equipped with an Archimedes spiral shape eddy flow spiral case 12, offers 8 on the heat supply airduct 1 in eddy flow spiral case 12 around the uniform air inlet 13 of tube wall (each air inlet 13 is axial arranged kidney shape hole).
The present invention is through evidence: have obvious effects of energy saving and emission reduction and remarkable social benefit and economic benefit, existing to produce 170t/h type grinding machine during with the LM56.3+3 of Lai Xie company be example, and this system's gross heat input is R
Supply=30 * 10
6Kca l/h, Q
Water=43318Nm
3/ h, Q
Cigarette=171308Nm
3/ h, t
Cigarette=500 ℃, Q
Return=122823Nm
3/ h, Q
Go into mill=294131Nm
3/ h, t
Return=90.7 ℃.If with t
Cigarette=t
Stove=1100 ℃, then
Q
ReturnTo increase to Q
Return=122823+ (171308-72345.8)=122823+98851.2=221674.2Nm
3/ h discharges Q less
Join=98851.2Nm
3/ h tail gas, saving heat energy is R
Joint=Q
Join* (90.7-20) ℃ * 0.33kca l/Nm
3=2306297kca l/h amounts to q=750kcal/Nm
3Blast furnace gas 3075Nm
3/ h, by 8000 hours/year, 0.43 yuan/Nm
3Meter, the annual combustion gas expense of saving
Annual few discharging
And carry out dew point and adjust: by formula
(q in the formula
CigaretteBe flue gas specific heat) as can be known, under the constant condition of heating load, flue-gas temperature and air demand are inversely proportional to, as Fig. 3: Q
Tail=Q
Stove+ Q
Water, along with Q
StoveMinimizing, Q
TailMore and more higher with moisture content in the gas in the mill, we are still to work as Q in above-mentioned LM56.3 * 3 systems
CigaretteIn the time of=500 ℃, Q
TailMoisture content is
Looking into dew point is t
Reveal=52 ℃; Work as Q
Cigarette=Q
StoveIn the time of=1100 ℃, Q
TailMoisture content is
Looking into dew point is t
Reveal=70 ℃; And operating t
Tail=90.7 ℃, the moisture content of dew point is about 150%; Even add and bring 2～4% part moisture content into the stove air into, system's operation is also still fool proof.
Claims (4)
1. vertical drying grinding ring stream is produced energy-saving and emission-reducing technique, at first hot-blast stove is produced high-temperature hot-air and is entered vertical mill through the heat supply airduct, behind the heating, drying material, hot blast carries material and enters bagroom through Material pipeline, material after the bagroom collection is dry and levigate is a product, discharge tail gas simultaneously, tail gas enters air-introduced machine through discharge pipe, the air-introduced machine exhaust outlet divides two-way, one the tunnel connects chimney to effluxing, another road connects the flue gas recurrent canal and returns distribution, it is characterized in that: on the heat supply airduct of the hot-blast stove port of export, have additional a special high temperature whirlwind air distribution device, the outlet of above-mentioned flue gas recurrent canal connects high temperature whirlwind air distribution device, and partly tail gas returns the heat supply airduct, all use to return gas and heating stove is exported high-temperature gas be assigned to＜300 ℃ go into mill.
2. be used for the described vertical drying grinding ring stream of claim 1 and produce the special high temperature whirlwind air distribution device of energy-saving and emission-reducing technique, include the heat supply airduct, it is characterized in that: the outer wall at the heat supply airduct is equipped with an eddy flow spiral case, offers the air inlet that n surrounding tube wall cloth put on the heat supply airduct in the eddy flow spiral case.
3. high temperature whirlwind air distribution device according to claim 2 is characterized in that: described eddy flow spiral case is Archimedes spiral shape or logatithmic spiral shape.
4. high temperature whirlwind air distribution device according to claim 2 is characterized in that: the described air inlet of opening on the heat supply airduct, rounded hole or axial arranged kidney shape hole.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910061263.2A CN101837316B (en) | 2009-03-21 | 2009-03-21 | Vertical drying grind ring flow production energy saving and emission reduction process and air distribution equipment thereof |
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|---|---|---|---|
| CN200910061263.2A CN101837316B (en) | 2009-03-21 | 2009-03-21 | Vertical drying grind ring flow production energy saving and emission reduction process and air distribution equipment thereof |
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| CN101837316A true CN101837316A (en) | 2010-09-22 |
| CN101837316B CN101837316B (en) | 2014-06-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102284334A (en) * | 2011-06-28 | 2011-12-21 | 广州新捷节能科技有限公司 | Multi-cavity swirl impact crusher with hot air balance pipes |
| CN103438687A (en) * | 2013-08-09 | 2013-12-11 | 黄石市建材节能设备总厂 | Explosion-proof safe energy-saving and emission-reducing fluidization oxygen-controlling drying system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3794251A (en) * | 1972-05-08 | 1974-02-26 | Williams Patent Crusher & Pulv | Material reducing system and apparatus |
| US4061274A (en) * | 1976-07-26 | 1977-12-06 | Williams Patent Crusher And Pulverizer Company | Material reducing apparatus and method of operating the same |
| US4226371A (en) * | 1979-04-06 | 1980-10-07 | Willams Robert M | Inert grinding and direct firing in coal burning systems |
| US5839673A (en) * | 1996-09-10 | 1998-11-24 | Williams; Robert M. | Apparatus for grinding material |
| CN100450952C (en) * | 2007-07-13 | 2009-01-14 | 缪建通 | Cement raw meal mill automatic control method and control device |
-
2009
- 2009-03-21 CN CN200910061263.2A patent/CN101837316B/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102284334A (en) * | 2011-06-28 | 2011-12-21 | 广州新捷节能科技有限公司 | Multi-cavity swirl impact crusher with hot air balance pipes |
| CN103438687A (en) * | 2013-08-09 | 2013-12-11 | 黄石市建材节能设备总厂 | Explosion-proof safe energy-saving and emission-reducing fluidization oxygen-controlling drying system |
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| Publication number | Publication date |
|---|---|
| CN101837316B (en) | 2014-06-18 |
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