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Coal grinds system and rotary kiln burner transform research

Author: ? Does ㄒ of soak of scandium ニ constant  carry: of unit of? of She of bracelet of  of  of ⒕ of He of  of clear of  Tuo Tang? Does intense of broadleaf plant  pour silent of  of  mother's brother?

Summary: ? What  bath carries day of?Phi;4.5m×lOOm of page of  yo lung to produce 960t is wet the combustion system that short kiln uses burner of only air channel and coal to grind waste gas to enter pit directly all the time, clinker hear rate tall, yield is low. In June 2002 portion, ground system and burner to undertake transforming to coal, energy-saving with economic benefits remarkable.
What day of my factory Φ4.5m×lOOm produces 960t is wet the combustion system that short kiln uses burner of only air channel and coal to grind waste gas to enter pit directly all the time, clinker hear rate tall, yield is low. In June 2002 portion, ground system and burner to undertake transforming to coal, energy-saving with economic benefits remarkable.

The problem of 1 existence
The coal before transforming grinds technological process of system of the head that reach kiln to see a picture 1.

The issue that be in puts in production:
1) coal grinds waste gas and kiln wind is common 1 typhoon machine, cause 2 systems to be disturbed each other. When increasing like wind, grind inside wind speed is fast, fineness is thick, the yield when the stage is high; Conversely, grind inside wind speed is slow, the product is fineness fine, the yield when the stage is low. If open cold air door to increase wind force, impact of the crop when the stoving ability that grinds to coal and stage is bigger, mutual interference makes coal is ground operate with kiln system flabby, achieve optimal craft status hard, restricted what coal grinds the crop when the stage to rise, fineness also is in residue on sieve of 10% ～ 15%(80μm) the wave motion inside limits.
Big, black flame grows dosage of waste gas of burner of 2) only air channel, combustion is not complete, clinker hear rate is high. The labour that occupy heat determines, kiln produces the ash content that use coal normally 25% , volatilize minute of ＞ 25% when, gush coal quantity is in 12t/h, 30% what right now wind occupies combustion air gross. When coal ash achieves 30% above, wind scale must be achieved 35% , mix with respect to coal of meeting occurrence wind otherwise not all, combustion state not the phenomenon of beautiful. Overmuch use coal grinds waste gas, cause pit 2 times wind scale is reduced, clinker hear rate is elevatory. Length controls black flame of burner of only air channel to be controlled in 500mm commonly, but length is in this kiln black flame 1.5m, rate of coal fines combustion is slow, light rate is low, the sank of thick grain of partial coal fines that did not light is in clinker, another part is taken away to be in by waste gas kiln is hind combustion, make kiln end temperature achieves 300 ℃ .

2 transform measure
Put the issue that be in according to the system, the decision grinds coal with kiln 2 systems part, the each other in adjusting a process in order to solve craft disturbs a problem. Use new-style burner to replace burner of coal fines of existing only air channel at the same time.
1) coal grinds dust catcher of installation bag type. Kiln and coal grind systematic departure, must solve waste gas to amount to mark to arrange an issue. Invest 600 thousand yuan for this, in the installation after segregator of coal mill pink a CGN—14 coal grinds bag type dust catcher, configured platoon fan afresh. Atmosphere is emited into after waste gas comes out to enter bag type dust catcher to purify processing by fine pink segregator, dust discharges chroma 50mg/m3. Demolish fine pink segregator to arrive at the same time the pipeline of kiln head air-blower, equipment. After raising yield to satisfy coal to grind, be opposite fineness requirement, reduced coal to grind average ball way. The technological process after transforming sees a picture 2, the system is main equipment sees a table 1.
Express 1 coal to grind a system main facility

2) uses burner of new-style double air channel. Choose KBN380 burner of coal fines of new-style double air channel. This burner eliminates the advantage that has windy path burner outside, mainer is to eliminate combustion to take appearance of local high temperature, make blaze temperature distributings more reasonable, the long cycle that is helpful for kiln runs. Burner of new-style double air channel overcame KBN series effectively the inadequacy of windy path burner. Have the following advantage:
① cancelled inside wind air channel, use adjustable type comes back stream implement, the air channel outside making comes back shed intensity to be able to be adjusted at will according to operating mode of kiln to calcine.
Because ② increased annular efflux ply apparently (the 2 times) that is burner of 3 air channel. Burner of new-style double air channel can defer coal fines and 2 wind to blend rate, drop temperature of blaze peak value, lengthen effectively firing lead firebrick life.
③ cancelled burner of traditional and windy path inside wind and outside windControl valveThe door, make the system becomes simple, can save fan power consumption about 30% .
④ blaze appearance basically passes the handwheel that is located in drive-box to go up to adjust, by the directive that is located in gear case to go up appearance is indicated, blaze control is very simple, accurate. BurnerThe appearance sees a picture 3. 3) installs a K below coal fines screw feederP200- 1 model helix pump, collect Ci fan sends coal fines to burner of double air channel to do through helix pump inside wind, outside wind by high pressure centrifugal fan offers wind, see a picture 2. The system is main equipment sees a table 2.
Express the 2 systems after transforming main facility and parameter

3 effects
The yield when 1) stage rises, section coal effect is apparent
Into grind hot air temperature by 380 ～ 400 ℃ raise 450 ～ 500 ℃ . Coal is ground can grind a gender moisture, easily according to raw coal, freedom adjustment wind force and the influence before sufferring kiln, the yield when the stage rises substantially, pink grinds power consumption to drop.
Move through 3 months, combustion of double wind burner is stable, blaze accident can pass rotational handle to adjust neatly, rate of coal fines combustion is rapid, light lead tall, black flame to shorten to 400 ～ 500mm, rotary kiln operates stability, turn quickly rate (≤60s/r) achieves 50% above. Section coal effect is apparent, frequency of electromotor of conveyer of the helix that feed coal drops by 30 ～ 35Hz to 25 ～ 30Hz, raw coal consumption falls by 280kg/t to 260kg/t; Next makings measure 88% ～ 90% raise 90% ～ 97% , the yield when the stage rises 43t/h by 40t/h. Kiln end temperature by 280 ～ 320 ℃ drop to 240 ～ 260 ℃ . Transform contrast of index of around engineering technology to see a table 3.
Watch 3 transform index of around engineering technology

　　
2) is energy-saving with economic benefits remarkable
Whole trick changes investment to make an appointment with 1 million yuan. Ability changes coal of section of the year after next 1.46 million yuan; After the yield when coal obliterates a platform rises, year managing charge of electricity 200 thousand yuan, the yield when kiln stage improves generation beneficial result 670 thousand yuan, aggregate produce per year become effective beneficial 2.33 million yuan.