CN100455968C - Shaft kiln heat recovery method and device - Google Patents
Shaft kiln heat recovery method and device Download PDFInfo
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- CN100455968C CN100455968C CNB2007100251546A CN200710025154A CN100455968C CN 100455968 C CN100455968 C CN 100455968C CN B2007100251546 A CNB2007100251546 A CN B2007100251546A CN 200710025154 A CN200710025154 A CN 200710025154A CN 100455968 C CN100455968 C CN 100455968C
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- energy recovery
- kiln
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- precipitator
- heat recovery
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Abstract
The invention relates to the method and device of the shaft kiln heat recovery, the characterizes are the exhaust gas of the cooler passes through the pipelines into the kiln then mixes the gas to enter the filter; thickening the preheating zone, increasing the wet material thickness; the cooked materials come out of the cooler and enter the dust mask, through the heat recovery duct into the filter; the high temperature exhaust gas of the crusher cavity through the heat recovery duct, access to the wind tube of the filter; on the two heat recovery duct installs the temperature control diction which is controlled by the procedure controller and air valve. The invention advantages: simple, reliable operation, the high precision measurement of heat recovery automation control device. The operators will be monitored in operation room timely and accurately, realize the manpower monitoring to reduce the labor intensity, increase production, reduce the coal consumption. At the same time the production process is stabile, improves the quality of products, reduces the coal consumption about 10 percent, and the output of each production increased about 10 percent; reduces the labor intensity of the operator, protects the health of workers and so on advantages.
Description
Technical field
What the present invention relates to is a kind of cement in vertical kiln heat energy recovery method and control system.Belong to the cement constructional material technical field.
Background technology
The reduction of the hear rate of cement in vertical kiln is the big difficult point of one in the cement production process.Annual nearly 100,000,000 tons of the mark coal that consumes of China's cement industry, electric power 65,000,000,000 degree are the second energy consumption rich anies influential family that are only second to metallurgy industry.And the average energy consumption of China's manufacture of cement is far above advanced international standard, calculates with the comprehensive energy consumption of grog per ton, and advanced international standard is a 107kg mark coal, and China is 153.5kg mark coal, exceeds more than 50%.The energy consumption of shaft kiln cement is higher.The hear rate of shaft kiln cement is higher at present, and how to reduce shaft kiln and burn till hear rate, be the emphasis of shaft kiln research of technique.The main flow process of burning till of cement in vertical kiln enterprise is: the raw material powder is weighed through weighing balance, mixes a certain proportion of water, after stirring, forms raw material ball by pan-pelletizer; Enter in the kiln by distributing device and to calcine.Calcining kiln is a kind of vertical fixed bed clinker burning equipment: contain the coal raw material ball in kiln top feeding kiln, pellet moves from top to bottom, and air moves from bottom to top.Calcining kiln is divided into three bands from top to bottom: preheating zone, high temperature clinkering zone and salband.Preheating zone: about 150 ℃ of temperature, the evaporation process of Free water; Clay mineral dehydration and magnesium carbonate take place and begin to decompose in 150～750 ℃ of temperature; Clinkering zone: 750～800 ℃ of temperature, the ablation amount obviously reduces, carbonate decomposition and solid phase reaction, because the endothermic reaction, so heating rate is slow.When temperature is raised to 1100 ℃, decomposition rate increases sharply.Free calcium oxide reaches maximum.Begin to occur liquid phase at 1250～1280 ℃, at 1450 ℃, amount of liquid phase increases, and free calcium oxide absorbs, and the clinker compound forms.Salband: grog continues to move downward, and the auxiliary air lower with temperature meets, and clinker temperature descends.General clinker temperature can be reduced to 300-500 ℃.
Along with the decline of grog, the rotation through tower in the kiln is combed enters discharge duct behind the attrition crushing, unload the kiln discharge body.Enter grog cooling machine, further cooling, this moment, big air quantity cold wind cooled off fast, and clinker temperature is quickly fallen to below 100 ℃ by high wind speed.Cooling machine waste gas and flue gas of shaft kiln enter big bag-type dust jointly.The cooling grog enter the grog disintegrating machine through chain mat machine, carry out further fragmentation after, enter clinker warehouse.Whole process is continuously.
Because the shaft kiln balling-up is that water mixed raw material powder is made, and when calcining in shaft kiln, must evaporate this a part of water, the heat energy of use is bigger, makes raw material coal blending amount strengthen.
The temperature that must keep clinkering zone during shaft kiln calcination, otherwise to influence clinker quality, so must keep kiln temperature by the thickening wet material layer thickness, and make that the kiln surface temperature is on the low side, and be that the temperature that enters dust-precipitator reaches close dew temperature, cause the cloth bag dewfall, be unfavorable for ventilation, dedusting, cause device damage, economic loss, more increase labor strength, the infringement workman is healthy.
Because the clinker temperature that gets off from the kiln discharge duct up to 300-500 ℃, directly enters in the cooling machine after the cooling, the High Temperature Gas physical efficiency of generation reaches 400-600 ℃, directly enters deduster, may burn the equipment in the deduster; Directly discharge more endangers atmosphere, influences working environment.
After grog enters the grog disintegrating machine, through behind the attrition crushing, temperature in the block grog is released, and the heat that produces during broken extruding, disintegrating machine is full of high-temperature gas in the chamber, the wallboard of disintegrating machine and tup in hot environment have a strong impact on particle size after cracking and service life of equipment because continuously extruded can the generation is out of shape, and cause serious plant issue and economic loss.
Summary of the invention
Purpose of the present invention is intended to solve the problem and the defective of above-mentioned existence, proposes a kind of shaft kiln heat energy recovery method and device, reduces shaft kiln and burns till energy consumption.
Technical solution of the present invention: the shaft kiln heat energy recovering method is a cooling machine waste gas by pipeline, enter kiln face mixing kiln face flue gas after, enter dust-precipitator again; The flue gas that enters dust-precipitator is mixed by kiln discharge flue gas and cooling machine waste gas, so the permission of kiln discharge flue-gas temperature is lower, the thickening preheating zone increases wet material layer thickness, reduces coal consumption; After grog goes out the cooling machine and enters deduster, enter dust-precipitator, make the grog cooling thoroughly, reduce free calcium oxide content and improve the grog quality, also got rid of the dust emission point in the manufacture of cement through the first energy recovery airduct; High-temp waste gas enters the airduct of dust-precipitator through the second energy recovery airduct in the disintegrating machine chamber, by the exhausting of dust-precipitator, broken cavity temperature is reduced, and the protection disintegrating apparatus more can sop up some fine dusts, gets rid of the dust emission point in the manufacture of cement; Use a cyclelog, a plurality of links of control energy recovery make it be integrated into a heat energy automation recovery control system; Temperature detection instrument and air-valve are installed on two energy recovery airducts, automatically regulate the air-valve of controlling on the energy recovery airduct according to the temperature in the every energy recovery airduct by cyclelog, the air quantity of control energy recovery airduct, the temperature that maintenance enters dust-precipitator normally guarantees the normal operation of activity in production.
Shaft kiln heat-energy recovering apparatus, its structure are the indirect first energy recovery airducts of dust excluding hood and dust-precipitator; High-temp waste gas enters the airduct of dust-precipitator through the second energy recovery airduct in the disintegrating machine chamber, on two energy recovery airducts temperature detection instrument and the air-valve that is subjected to cyclelog control is installed.
Advantage of the present invention: simple in structure, reliable, the high energy recovery automatic control device of survey inspection precision.The operator just can promptly and accurately monitor at operating room, realizes manual monitoring, reaches the purpose that alleviates labor strength, raising output, reduces coal consumption.Have the card stable production process simultaneously, improve the quality of products; Reduce coal consumption about 10%, unit-hour output improves about 10%; Reduce operator's labour intensity, advantage such as the protection workman is healthy.
Description of drawings
Accompanying drawing 1 is a shaft kiln firing process flow chart.
The 1st, measuring equipment, the 2nd, powder water mixing, the 3rd, raw material powder, the 4th, mixer, the 5th, pan-pelletizer, the 6th, raw material ball, the 7th, distributing device, the 8th, dust-precipitator, the 9th, discharge duct, the 10th, cooling machine, the 11st, chain mat machine, the 12nd, grog disintegrating machine, the 13rd, deduster, the 14th, clinker warehouse.
The specific embodiment
Cooling machine waste gas is by pipeline, enter kiln face mixing kiln face flue gas after, enter dust-precipitator again; Because flue-gas temperature is higher, cloth bag is difficult for dewfall, has prolonged the service life of equipment greatly, has reduced workman's hard work intensity.Mix by kiln discharge flue gas and cooling machine waste gas owing to enter the flue gas of dust-precipitator,, therefore can thicken the preheating zone, increase wet material layer thickness, reduce coal consumption so the permission of kiln discharge flue-gas temperature is lower.
Because grog is forced rapidly cooling in the cooling machine, grog breaks and disperses many thin ashes of generation and steam, after grog goes out the cooling machine, enter deduster after,
Can enter dust-precipitator by pipeline, can make grog cooling thoroughly, reduce free calcium oxide content and improve the grog quality, also get rid of the dust emission point in the manufacture of cement.
High-temp waste gas inserts the airduct that enters dust-precipitator by pipeline in the disintegrating machine chamber, by the exhausting of dust-precipitator, broken cavity temperature is reduced, the protection disintegrating apparatus; More can sop up some fine dusts, get rid of the dust emission point in the manufacture of cement.
Use a cyclelog, a plurality of links of control energy recovery make it be integrated into a heat energy automation recovery control system.
Temperature detection instrument and air-valve are installed on two energy recovery airducts.Can have cyclelog to regulate the air-valve of controlling on the every airduct automatically according to the temperature in the every warm-air pipe, control is by the air quantity of airduct, and the temperature that maintenance enters dust-precipitator normally guarantees the normal operation of activity in production.
The present invention has realized the transformation of shaft kiln enterprise to high-quality, energy-conservation, joint consumption direction, has realized the shaft kiln sustained development of enterprises, shines shaft kiln enterprise great vitality more, for a road that has more prospect is explored in the survival and development of vast shaft kiln enterprise.
Cyclelog:, can control the operation of a plurality of equipment and the follow-up work of test point as computer, microcomputer, single-chip microcomputer or the like.
Dust-precipitator: a kind of environmental protection equipment of collecting dust, as big bagroom, electrostatic precipitator or the like, when cooperating shaft kiln to use, can suck dust-precipitator to fine powder in the kiln, prevent that the kiln condition from changing, windage in the balance kiln improves shaft kiln output.
Air-valve: pipeline valve a kind of, can control in the pipeline size by air quantity.
Temperature detection instrument: as the instrument of detected temperatures such as thermocouple of the prior art, infrared thermometer variation.
Claims (1)
1, shaft kiln heat energy recovery method is characterized in that cooling machine waste gas by pipeline, enter kiln face mixing kiln face flue gas after, enter dust-precipitator again; The flue gas that enters dust-precipitator is mixed by kiln discharge flue gas and cooling machine waste gas; Thereby wet material layer thickness is increased; After grog goes out the cooling machine and enters deduster, enter dust-precipitator, make the grog cooling thoroughly, reduce free calcium oxide content and improve the grog quality through the first energy recovery airduct; High-temp waste gas enters the airduct of dust-precipitator through the second energy recovery airduct in the disintegrating machine chamber, by the exhausting of dust-precipitator, broken cavity temperature is reduced; Use a cyclelog, a plurality of links of control energy recovery make it be integrated into a heat energy automation recovery control system; Temperature detection instrument and air-valve are installed on two energy recovery airducts, are regulated the air-valve of controlling on the energy recovery airduct automatically according to the temperature in the every energy recovery airduct, the air quantity of control energy recovery airduct by cyclelog.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100251546A CN100455968C (en) | 2007-07-13 | 2007-07-13 | Shaft kiln heat recovery method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100251546A CN100455968C (en) | 2007-07-13 | 2007-07-13 | Shaft kiln heat recovery method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101101174A CN101101174A (en) | 2008-01-09 |
| CN100455968C true CN100455968C (en) | 2009-01-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100251546A Expired - Fee Related CN100455968C (en) | 2007-07-13 | 2007-07-13 | Shaft kiln heat recovery method and device |
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| CN (1) | CN100455968C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109307412B (en) * | 2018-09-17 | 2023-09-05 | 湖南星华能源科技服务有限公司 | Uniform ventilation uniform discharging dustproof energy-saving vertical baking kiln |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1007178B (en) * | 1986-10-17 | 1990-03-14 | 日立造船株式会社 | Apparatus for energy recovery from furnace waste gas |
| CN2847200Y (en) * | 2005-09-05 | 2006-12-13 | 海城市牌楼梁兰除尘设备厂 | Electric dust remover for electric melting magnesium furnace and kiln |
| JP2007130565A (en) * | 2005-11-10 | 2007-05-31 | Mitsubishi Materials Corp | Method and system for recovery of valuable element in cement calcination plant |
-
2007
- 2007-07-13 CN CNB2007100251546A patent/CN100455968C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1007178B (en) * | 1986-10-17 | 1990-03-14 | 日立造船株式会社 | Apparatus for energy recovery from furnace waste gas |
| CN2847200Y (en) * | 2005-09-05 | 2006-12-13 | 海城市牌楼梁兰除尘设备厂 | Electric dust remover for electric melting magnesium furnace and kiln |
| JP2007130565A (en) * | 2005-11-10 | 2007-05-31 | Mitsubishi Materials Corp | Method and system for recovery of valuable element in cement calcination plant |
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| Publication number | Publication date |
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| CN101101174A (en) | 2008-01-09 |
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