CN101634518B - Calcining and production method of rotary kiln - Google Patents
Calcining and production method of rotary kiln Download PDFInfo
- Publication number
- CN101634518B CN101634518B CN2009100659465A CN200910065946A CN101634518B CN 101634518 B CN101634518 B CN 101634518B CN 2009100659465 A CN2009100659465 A CN 2009100659465A CN 200910065946 A CN200910065946 A CN 200910065946A CN 101634518 B CN101634518 B CN 101634518B
- Authority
- CN
- China
- Prior art keywords
- rotary kiln
- kiln
- temperature
- calcining
- negative pressure
- Prior art date
- 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.)
- Active
Links
Landscapes
- Muffle Furnaces And Rotary Kilns (AREA)
Abstract
The invention provides a calcining and production method of a rotary kiln. The calcining and production method eliminates a once-to-four-time air supply system and contributes to satisfy the requirement on the normal work of the rotary kiln and the output of qualified calcined material. As no fault damage caused by a twice/thrice air supply system exists, the operation period of the rotary kiln is prolonged. Meanwhile, due to the elimination of the once-to-four-time air supply system, a certain amount of electricity and apparatus maintaining cost is saved, the energy conservation effect is obvious, and the productivity of the rotary kiln is not reduced. The actual yield of the calcined material is obviously improved, namely the original 70% of yield is improved to present 72%. The reason for the improvement is that system negative pressure is reduced so that powder material is not sucked away due to the increase of a suction force in the kiln in the case of the overlarge negative pressure. The annual extra output is equivalently about 1200 tons.
Description
Technical field
The invention belongs to the rotary kiln technology technical field, especially the calcining production method of a kind of rotary kiln that uses at building materials, metallurgy, chemical industry.
Background technology
Rotary kiln is the capital equipment of industry production, and its effect is that material is calcined.In the production run process, material is along with the gradient of cylindrical shell self and gyration and advance, to reach the purpose of solid material being carried out machinery, physical or chemical treatment.
Existing rotary kiln production technology all is to rely on wind on fuel such as coal gas and the cylinder of rotary kiln to chew by two, three air intakes to spray into burning to keep the normal calcining heat of rotary kiln, for guaranteeing full combustion of fuel, at kiln hood primary air system is housed also simultaneously.For preventing the too high damage kiln hood of temperature cover, wind system cooling kiln hood guard shield is installed four times.
This kind production technology consume fuel amount is very big, for keeping the material burning in the rotary kiln, needs continuous postcombustion, while two, tertiary air system are owing to be positioned high temperate zone, scaling loss very easily, the rotary system of need stopping transport during maintenance has strengthened production cost and plant maintenance amount thus.
Summary of the invention
For addressing the above problem, the invention provides a kind of calcining production method of rotary kiln, this calcining production method has been cancelled supply air system one to four time, has satisfied the ordinary production of rotary kiln and has produced qualified calcining materials by this calcining production method.Owing to do not exist the fault of two, three supply air systems to damage, prolonged the cycle of operation of rotary kiln, also because the supply air system of having stopped using to four time has been saved certain electric weight and equipment maintenance cost, energy-saving effect is obvious simultaneously.
For achieving the above object, the present invention adopts following technical scheme:
The calcining production method of described a kind of rotary kiln comprises following content:
I, close the blower fan in one, two, three and four supply air systems of rotary kiln, start the smoke exhaust fan that is positioned at the rotary kiln back-end ductwork, slowly regulate the air-introduced machine baffle plate rotary kiln negative pressure reached-50pa, keep turning down the air-introduced machine baffle plate after 15 minutes, make kiln tail negative pressure remain on-15～-35pa; Feed coal gas in the kiln hood position of rotary kiln rotary kiln is dried by the fire kiln, intensification, get rid of the moisture in the interior refractory material of rotary kiln and improve the access temperature coupling that its temperature made it and prepared to add material; The stand-by motor that carries with rotary kiln when the rotary kiln temperature reaches 350 ℃ rotates the kiln body at interval, rotates 90 and spends in per 30 minutes;
Ii, when reaching 750 ℃, the rotary kiln temperature carries out following operation:
Stop stand-by motor, start main motor with the minimum speed rotary kiln that turns round, the kiln speed control is built in 1.0～1.8 rev/mins, and temperature retention time is no less than 8 hours when rotary kiln reaches steady temperature;
Preparation before iii, beginning rotary kiln feed intake is confirmed that upstream equipment and upstream device are normal and is in stand-by state; By the upstream equipment continuous dosing, adjustings inventory is 1.0T/h to rotary kiln, raising kiln speed to 1.8 rev/min; Along with the increase of inventory, combustible also increases gradually in the kiln, notes the variation of calcining belt temperature and kiln hood negative pressure, and the size of variation is adjusted by the coal gas input quantity; Material down and rely on the volatility spontaneous combustion of material itself forms local high-temp combustion band the combustion-supporting of coal gas, and constantly rotation is slowly mobile by kiln Caudad kiln hood by the kiln body for material, is subjected to flame high temperature and is heated and reaches calcining in motion process;
Stop to supply with coal gas when the calcining belt temperature in the rotary kiln reaches 1270 ± 50 ℃ and after keeing relative stability, make the material calcining in the rotary kiln rely on the volatilization burning of self to produce heat;
Iv, adjust the combustion zone position of rotary kiln, the mode of adjustment make burning zone be stabilized in apart from the position of kiln tail 15～25m promptly two, between the tertiary-air pipe position and make temperature maintenance at 1270 ± 50 ℃; At this moment, the rotary kiln negative pressure is controlled at-4～-9Pa, the rotary kiln end negative pressure is controlled at-5～0Pa;
The input feeding coal of v, control material is at 7～10 tons/hour;
The rotation kiln speed of vi, control rotary kiln is at 2.4～2.5 rev/mins; The rotary kiln end temperature is controlled at 750 ± 100 ℃;
Vii, monitoring rotary kiln are by described parameter index operation, for next process provides qualified calcining materials.
Because adopt aforesaid technical scheme, the present invention has following superiority:
1, with
2.5 * 50m rotary kiln is an example, if according to 10 tons/time productivity ratio conservative measuring and calculating, can save power consumption 190,000 KWh (totally 4 in one to four wind wind-powered electricity generation machine, power 5.5kw/ platform, annual) every year by operation in 365 days, save coal gas 910,000 m
3If (under normal circumstances, need to replenish continually coal gas 2500m
3/ day), direct saving energy consumption fund reaches 1,350,000 yuan (by 1.4 yuan/m of present coal gas market average price
3, electricity is adjusted by 0.42 yuan/degree).
2, the casting yield of calcining materials obviously improves, and brings up to now about 72% by original 70%, and this is because the reduction of system's negative pressure, and powder can be not excessive because of negative pressure, and furnace draft increases and is sucked away, and is equivalent to annual about 1200 tons of the output that increases.
3, owing to there has not been the damage of two, three air-supplies, prolong the time between overhauls(TBO) of rotary kiln simultaneously, the service life of rotary kiln was brought up to more than 12 months by present 6 months, can save about 200,000 yuan of recondition expense every year.
The specific embodiment
With
2.5 * 50m, 10 tons/time rotary kiln be example, specify calcining production method of the present invention.
For making calcining materials fully burning in kiln, at the middle part of rotary kiln air-supply arrangement is housed: secondary air system and tertiary air system.A wind is positioned at the kiln hood position of rotary kiln, and the coal gas that is mainly feeding provides sufficient oxygen.Four wind systems are positioned at the kiln hood position of rotary kiln, and main cooling kiln head-shield position prevents that temperature is too high, damages the kiln hood cover.So the blower fan of cutting out in one, two, three and four supply air systems of rotary kiln makes it out-of-blast.
For making material fully burning in airtight relatively cylinder of rotary kiln, be provided with heavy grey chamber, flue, smoke exhaust fan, chimney at the afterbody of rotary kiln, can make the inner certain negative pressure that forms of rotary kiln.Start smoke exhaust fan, slowly regulate the air-introduced machine baffle plate rotary kiln negative pressure is reached-50pa, keep turning down the air-introduced machine baffle plate after 15 minutes, make kiln tail negative pressure remain on-15～-35pa.
Feed coal gas in the kiln hood position of rotary kiln rotary kiln is dried by the fire kiln, intensification, carry out warming temperature according to the heating curve of working out, get rid of the moisture in the interior refractory material of rotary kiln and improve the access temperature coupling that the interior temperature of kiln made it and prepared to add material.When the rotary kiln temperature reached 350 ℃, the stand-by motor that carries with rotary kiln rotated the kiln body at interval, rotated 90 and spent in per 30 minutes.
When reaching 750 ℃, the rotary kiln temperature carries out following operation:
1. stop stand-by motor, the rotary kiln speed regulator is adjusted to minimum aperture, start main motor, guarantee that rotary kiln is with minimum speed running.
2. the rotation kiln speed of controlling rotary kiln is at 1.0 rev/mins.
Again rise when not getting on after reaching steady temperature during 3. according to heating curve baking kiln, be no less than 8 hours in this temperature retention time.
Preparation before the beginning rotary kiln feeds intake is confirmed that upstream equipment and upstream device are normal and is in stand-by state.
By the upstream equipment continuous dosing, the adjusting inventory is 1.0T/h to rotary kiln.Change kiln speed, rotating speed is brought up to 1.8 rev/mins by 1.0 rev/mins that begin to feed intake.
Feed intake the initial stage, along with the increase of inventory, combustible also increases gradually in the kiln, note the variation of calcining belt temperature and kiln hood negative pressure more, and in time adjust by the coal gas input quantity.Owing to feed intake in kiln, the kiln condition takes place sharply to change, and regulates with coal gas, makes heavy grey chamber inlet temperature meet the temperature of heating curve defined.
Material in the rotary kiln is at the combustion-supporting volatility spontaneous combustion that relies on material itself, the high-temp combustion band that formation is local of reaching down of coal gas.This moment, the material in the rotary kiln constantly rotated by the kiln body, and material is slowly moved by kiln Caudad kiln hood, is subjected to flame high temperature and is heated and reaches calcining in motion process.
Stop to supply with coal gas when the calcining belt temperature in the rotary kiln reaches 1270 ± 50 ℃ and after keeing relative stability, make the material calcining in the rotary kiln rely on the volatilization burning of self to produce heat.Owing to do not re-use coal gas, so primary air fan is also just ineffective.
Adjust the combustion zone position of rotary kiln, the mode of adjustment make burning zone be stabilized in apart from the position of kiln tail 15～25m promptly two, between the tertiary-air pipe position and make temperature maintenance at 1270 ± 50 ℃.Because the position of high-temperature calcination band near the postmedian of rotary kiln, so can not cause high-temperature damage to the kiln hood of rotary kiln, can not impact rotary kiln device so cancel four wind systems in the calcine technology.At this moment, the rotary kiln negative pressure is controlled at-4～-9Pa, the rotary kiln end negative pressure is controlled at-5～0Pa.If negative pressure is excessive, can cause the material in the rotary kiln to be taken away by system's negative pressure, cause the material casting yield to descend; If negative pressure is too small, the material burning in the rotary kiln is insufficient, not even burning.
The input feeding coal of control material is at 7～10 tons/hour.
The rotation kiln speed of control rotary kiln is at 2.4～2.5 rev/mins.The rotary kiln end temperature is controlled at 750 ± 100 ℃.
The monitoring rotary kiln is by described parameter index operation, for next process provides qualified calcining materials.
Claims (1)
1. the calcining production method of a rotary kiln, it is characterized in that: this calcining production method comprises following content:
I, close the blower fan in one, two, three and four supply air systems of rotary kiln, start the smoke exhaust fan that is positioned at the rotary kiln back-end ductwork, slowly regulate the air-introduced machine baffle plate rotary kiln negative pressure reached-50pa, keep turning down the air-introduced machine baffle plate after 15 minutes, make kiln tail negative pressure remain on-15～-35pa; Feed coal gas in the kiln hood position of rotary kiln rotary kiln is dried by the fire kiln, intensification, get rid of the moisture in the interior refractory material of rotary kiln and improve the access temperature coupling that its temperature made it and prepared to add material; The stand-by motor that carries with rotary kiln when the rotary kiln temperature reaches 350 ℃ rotates the kiln body at interval, rotates 90 and spends in per 30 minutes;
Ii, when reaching 750 ℃, the rotary kiln temperature carries out following operation:
Stop stand-by motor, start main motor with the fast rotary kiln that turns round of 1.0 rev/mins kiln, temperature retention time is no less than 8 hours when rotary kiln reaches steady temperature;
Preparation before iii, beginning rotary kiln feed intake is confirmed that upstream equipment and upstream device are normal and is in stand-by state; By the upstream equipment continuous dosing, adjustings inventory is 1.0T/h to rotary kiln, raising kiln speed to 1.8 rev/min; Along with the increase of inventory, combustible also increases gradually in the kiln, notes the variation of calcining belt temperature and kiln hood negative pressure, and the size of variation is adjusted by the coal gas input quantity; Material down and rely on the volatility spontaneous combustion of material itself forms local high-temp combustion band the combustion-supporting of coal gas, and constantly rotation is slowly mobile by kiln Caudad kiln hood by the kiln body for material, is subjected to flame high temperature and is heated and reaches calcining in motion process;
Stop to supply with coal gas when the calcining belt temperature in the rotary kiln reaches 1270 ± 50 ℃ and after keeing relative stability, make the material calcining in the rotary kiln rely on the volatilization burning of self to produce heat;
Iv, adjust the combustion zone position of rotary kiln, the mode of adjustment make burning zone be stabilized in apart from the position of kiln tail 15～25m promptly two, between the tertiary-air pipe position and make temperature maintenance at 1270 ± 50 ℃; At this moment, the rotary kiln negative pressure is controlled at-4～-9Pa, the rotary kiln end negative pressure is controlled at-5～0Pa;
The input feeding coal of v, control material is at 7～10 tons/hour;
The rotation kiln speed of vi, control rotary kiln is at 2.4～2.5 rev/mins; The rotary kiln end temperature is controlled at 750 ± 100 ℃;
Vii, monitoring rotary kiln are by described parameter index operation, for next process provides qualified calcining materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100659465A CN101634518B (en) | 2009-08-17 | 2009-08-17 | Calcining and production method of rotary kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100659465A CN101634518B (en) | 2009-08-17 | 2009-08-17 | Calcining and production method of rotary kiln |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101634518A CN101634518A (en) | 2010-01-27 |
| CN101634518B true CN101634518B (en) | 2011-03-30 |
Family
ID=41593782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100659465A Active CN101634518B (en) | 2009-08-17 | 2009-08-17 | Calcining and production method of rotary kiln |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101634518B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102557001B (en) * | 2010-12-28 | 2014-03-12 | 晟通科技集团有限公司 | Method for increasing extraction yield of calcined petroleum coke in rotary kiln |
| CN104315841B (en) * | 2014-10-24 | 2016-06-22 | 湖南创元新材料有限公司 | Rotary kiln starting method |
| CN109507224B (en) * | 2018-12-07 | 2021-04-02 | 苏州市相城检测股份有限公司 | Building material volatility detection method |
| CN111692877A (en) * | 2020-05-15 | 2020-09-22 | 内蒙古浦瑞芬环保科技有限公司 | Flue gas utilization system, flue gas utilization process and high-temperature combustion treatment system |
| CN114115144B (en) * | 2021-11-09 | 2024-04-12 | 武汉理工大学 | Automatic coal withdrawal control method and system for cement kiln decomposing furnace under RDF (RDF) condition |
-
2009
- 2009-08-17 CN CN2009100659465A patent/CN101634518B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN101634518A (en) | 2010-01-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101634518B (en) | Calcining and production method of rotary kiln | |
| CN101762154B (en) | Energy-saving ceramic tunnel kiln | |
| CN101324399B (en) | Drying room waste gases incineration flue gas heating system with adjustable heat supply | |
| CN108534170B (en) | Boiler smoke and wind mixing temperature rise adjusting system and control method thereof | |
| CN103641345A (en) | Material-distribution type cooling process of white cement clinker | |
| CN102878820B (en) | Application process of smoke recirculation on rotary kiln | |
| CN103148700A (en) | Energy-saving roller kiln and use method thereof | |
| CN103043936A (en) | Expanded perlite ore preheating furnace and working method thereof | |
| CN203718786U (en) | Mixed combustion device for converter gas and pulverized coal | |
| CN102423750B (en) | Energy-saving environmental-friendly gas heating system of curing tunnel of coating machine | |
| CN210891662U (en) | Solid waste pre-incineration system for cooperative disposal of cement kiln | |
| CN101423347A (en) | Ignition warming up method of cement dry method rotary kiln | |
| CN109114973A (en) | A kind of energy-saving environment protection intelligent roller way kiln | |
| CN203582740U (en) | Opposed-firing sleeve lime kiln | |
| CN206891155U (en) | Energy-saving consumption-reducing device for roller kiln | |
| CN202852866U (en) | Induced air control system | |
| CN202660524U (en) | Load regulating device of coal water slurry steam boiler | |
| CN201909989U (en) | Automatically-controlled energy-saving system of boiler | |
| CN105439141B (en) | A kind of environmental protection and energy saving activated carbon lifts stove | |
| CN201104098Y (en) | Macrotype rotary kiln petroleum coke calcining device | |
| CN104214793A (en) | Continuous adjusting device for combustion air | |
| CN202988995U (en) | Expanded perlite ore sand preheating furnace | |
| CN103301921B (en) | Energy-saving and emission-reducing device and method for industrial vertical mill | |
| CN101376496B (en) | Large-sized rotary kiln petroleum coke calcination method and apparatus | |
| CN203683636U (en) | Novel shaft furnace for roasting scherbinaite coal composite additive burden |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |