CN104529203A - Method for stepwise cooling cement clinker - Google Patents
Method for stepwise cooling cement clinker Download PDFInfo
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- CN104529203A CN104529203A CN201410768273.0A CN201410768273A CN104529203A CN 104529203 A CN104529203 A CN 104529203A CN 201410768273 A CN201410768273 A CN 201410768273A CN 104529203 A CN104529203 A CN 104529203A
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- air
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- cooler
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Abstract
The invention provides a method for stepwise cooling a cement clinker. The method is characterized by comprising steps of (1) first-stage quick cooling; (2) clinker crushing; and (3) second-stage conventional cooling. The cooling method comprises first-stage cooling and second-stage cooling, and the cooling volume of the two cooling stages can be controlled independently, so that the stability of the system is improved, and air mixing among air openings can be avoided; air entering a first-stage cooler is subjected to heat exchange to form high-temperature hot air which is completely used for supplying secondary and tertiary air for a system, wherein the average temperature after the secondary air and the tertiary air are mixed can be more than 1050 DEG C, so that the heat recovery efficiency of the cooler can be over 85 percent; a crushing step is executed before second-stage cooling, so that the contact area of the clinker and cooling air in a second-stage cooler can be increased, the air entering the second-stage cooler is only 0.6-0.8Nm<3>/kg.cl, and the air volume is remarkably reduced; furthermore, the temperature of formed hot air is remarkably increased, so that caloric content in the clinker is recycled as much as possible; and the total cooling air volume in the two cooling stages can be controlled under 1.5Nm<3>/kg.cl, and the total air volume is remarkably reduced.
Description
Technical field
The invention belongs to Cement industry and manufacture field, be specifically related to the distribution method of cooling of the cement clinker used in a kind of dry-process cement clinker firing system.
Background technology
In the production process of cement, particularly in the cement produced with the dry method technological process of production, after Cement clinker buring, all need to carry out clinker cooling.Existing clinker cooling method is: unloaded from the kilneye of rotary kiln by the high temperature chamotte of 1300 DEG C ~ 1450 DEG C and fall the grate of rapid cooling machine, be distributed along grate total length, form certain thickness material bed, cooling air is upwards blown in the bed of material below material bed, diffusion, cool hot grog, total cooling air quantity is 1.7 ~ 2.1Nm usually
3/ kg.cl.Cooling air after cooling grog becomes hot blast, and at the hot blast that hot junction formation temperature is higher, hot blast temperature can reach about 950 DEG C, the high-temperature hot-air of this end as two, tertiary air provides the hot gas of fuel combustion for rotary kiln and decomposing furnace; At the hot blast (also claiming the lingering remnants of past customs) that low-temperature end formation temperature is lower, crude fuel can be used as and dry and cogeneration.Hot blast utilizes can reach recovery of heat, thus reduces the object of system hear rate.The cooled fritter grog of cement clinker falls into the transfer roller after cooler through grizzly, bulk grog then through broken, send in above-mentioned rapid cooling machine and cool again, import in transfer roller after cooling.This in actual use, there is the deficiency of following several respects in above-mentioned clinker cooling method:
1, use in wind at clinker cooling, due to the fluctuation in different situ production, the string wind respectively got between air port can be caused, cause two, the temperature of tertiary air is on the low side, affects the stability of technique.
2, the heat recovery rate of cooler only can reach about 74% (heat recovery rate with two, tertiary air enthalpy and the kiln discharge ratio that enters cooler grog enthalpy represent), and heat recovery rate is on the low side, needs to be improved further.
3, cooler always uses air quantity higher.
Summary of the invention
Technical problem to be solved by this invention be to provide a kind of avoid going here and there wind phenomenon generation, minimizing air quantity and improve the step cooling method of the cement clinker of heat recovery rate.
The technical scheme that the present invention adopts for the technical problem existed in solution known technology is:
1. a step cooling method for cement clinker, is characterized in that, comprises following three steps:
1) one section of cooling fast: the high temperature chamotte of 1300 DEG C ~ 1450 DEG C falls in one section of rapid cooling machine by rotary kiln kilneye after calcining, high temperature chamotte and the freezing air be blown in rapid cooling machine carry out heat exchange, when grog moves to the discharge port position of rapid cooling machine, its temperature drops to 500 DEG C ~ 700 DEG C, wherein, what enter into the freezing air in one section of rapid cooling machine with air quantity is: 0.7 ~ 0.9Nm
3/ kg.cl;
2) chamotte crushing: drop in chamotte crushing device through one section of grog cooled fast, shredder assembly carries out fragmentation to the grog of bulk, and the grog making particle diameter be less than 25mm accounts for more than 90%;
3) two sections of common coolings: the grog through fragmentation drops in two sections of common coolers, grog and the freezing air be blown in this cooler carry out heat exchange, when grog moves to the discharge port position of this cooler, its temperature drops to less than 100 DEG C, then drop on conveyor by the discharge port of this cooler, be transported to clinker warehouse, wherein, what enter into the freezing air in two sections of common coolers with air quantity is: 0.6 ~ 0.8Nm
3/ kg.cl,
The technical scheme that the present invention can also take is:
The temperature being blown into the freezing air in one section of rapid cooling machine is 20 DEG C ~ 40 DEG C.
The advantage that the present invention has and beneficial effect are:
1, this method of cooling comprises one-step cooling and two-step cooling, and the cooling air quantity of two cooling sections can independently control, thus improves the stability of system, avoids the string wind between each air port; The high-temperature hot-air that the air entering one-step cooling machine is formed after heat exchange all for providing two for system, tertiary air, two, the mixed medial temperature of tertiary air can reach more than 1050 DEG C, the heat recovery rate of such cooler can up to more than 85%, and more current about 74% heat recovery rate improves more than 10%.Two, tertiary air burns for rotary kiln and decomposing furnace after discharging.
2, before two-step cooling, arrange broken work step, after the grog of fragmentation enters into two sections of common coolers, can increase the contact area of grog and cooling air, the air quantity entering into two-step cooling machine is like this only 0.6 ~ 0.8Nm
3/ kg.cl, compared to 1.0 ~ 1.2Nm of existing common cooler
3/ kg.cl air quantity, it is obviously less with air quantity; In addition, the wind-warm syndrome of the hot blast of formation can be made to significantly improve, thus as far as possible the heat content in grog is carried out recycling.For the oven dry of crude fuel and cogeneration after the hot blast discharge formed by this cooling section.
3, one-step cooling machine with air quantity is: 0.7 ~ 0.9Nm
3/ kg.cl, two-step cooling machine with air quantity be: 0.6 ~ 0.8Nm
3/ kg.cl, two cooling sections always cooling air quantity can be controlled in 1.5Nm
3/ below kg.cl, this uses total blast volume compared to existing 1.7 ~ 2.1Nm
3total air quantity of/kg.cl, obviously reduces.
Embodiment
For summary of the invention of the present invention, Characteristic can be understood further, hereby exemplify following examples, and be described in detail as follows:
A step cooling method for cement clinker, comprises following three steps:
1) one section of cooling fast: the high temperature chamotte of 1300 DEG C ~ 1450 DEG C falls in one section of rapid cooling machine by rotary kiln kilneye after calcining, high temperature chamotte and the freezing air be blown in rapid cooling machine carry out heat exchange, when grog moves to the discharge port position of rapid cooling machine, its temperature drops to 500 DEG C ~ 700 DEG C, wherein, what enter into the freezing air in one section of rapid cooling machine with air quantity is: 0.7 ~ 0.9Nm
3/ kg.cl.
2) chamotte crushing: drop in chamotte crushing device through one section of grog cooled fast, shredder assembly carries out fragmentation to the grog of bulk, and the grog making particle diameter be less than 25mm accounts for more than 90%.Carrying out broken object to bulk grog is: the cooling process being convenient to subsequent clinker.
3) two sections of common coolings: the grog through fragmentation drops in two sections of common coolers, grog and the freezing air be blown in this cooler carry out heat exchange, when grog moves to the discharge port position of this cooler, its temperature drops to less than 100 DEG C, then drop on conveyor by the discharge port of this cooler, be transported to clinker warehouse.Wherein, what enter into the freezing air in two sections of common coolers with air quantity is: 0.6 ~ 0.8Nm
3/ kg.cl.
In above-mentioned method of cooling, the temperature being blown into the freezing air in one section of rapid cooling machine is preferably 20 DEG C ~ 40 DEG C.
The above-mentioned air entering one-step cooling machine formed after heat exchange high temperature two, tertiary air, two, the medial temperature of tertiary air can reach 1050 DEG C.Two, tertiary air is for rotary kiln and decomposing furnace fuel combustion.The above-mentioned air entering into two-step cooling machine forms the hot blast (also claiming the lingering remnants of past customs) of low temperature after heat exchange, the oven dry of low temperature hot blast crude fuel and cogeneration.
Step cooling method of the present invention, compared to existing method of cooling, the advantage had is: what accurately can control Controlled cooling system uses air quantity, while guarantee clinker quality, improve two as much as possible, tertiary air temperature, ensure that the stability of system process, this also can guarantee the Effec-tive Function of equipment; Grog be divided into fast and common two sections cool, so not only can reduce the use of cooling air quantity, while meeting clinker cooling, also improve lingering remnants of past customs temperature, reduce system thermosteresis, reduce system hear rate, the heat recovery efficiency of refrigerating unit is improved greatly.
Claims (2)
1. a step cooling method for cement clinker, is characterized in that, comprises following three steps:
1) one section of cooling fast: the high temperature chamotte of 1300 DEG C ~ 1450 DEG C falls in one section of rapid cooling machine by rotary kiln kilneye after calcining, high temperature chamotte and the freezing air be blown in rapid cooling machine carry out heat exchange, when grog moves to the discharge port position of rapid cooling machine, its temperature drops to 500 DEG C ~ 700 DEG C, wherein, what enter into the freezing air in one section of rapid cooling machine with air quantity is: 0.7 ~ 0.9Nm
3/ kg.cl;
2) chamotte crushing: drop in chamotte crushing device through one section of grog cooled fast, shredder assembly carries out fragmentation to the grog of bulk, and the grog making particle diameter be less than 25mm accounts for more than 90%;
3) two sections of common coolings: the grog through fragmentation drops in two sections of common coolers, grog and the freezing air be blown in this cooler carry out heat exchange, when grog moves to the discharge port position of this cooler, its temperature drops to less than 100 DEG C, then drop on conveyor by the discharge port of this cooler, be transported to clinker warehouse, wherein, what enter into the freezing air in two sections of common coolers with air quantity is: 0.6 ~ 0.8Nm
3/ kg.cl.
2. the step cooling method of cement clinker according to claim 1, is characterized in that: the temperature being blown into the freezing air in one section of rapid cooling machine is 20 DEG C ~ 40 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410768273.0A CN104529203A (en) | 2014-12-12 | 2014-12-12 | Method for stepwise cooling cement clinker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410768273.0A CN104529203A (en) | 2014-12-12 | 2014-12-12 | Method for stepwise cooling cement clinker |
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| CN104529203A true CN104529203A (en) | 2015-04-22 |
Family
ID=52844892
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| CN201410768273.0A Pending CN104529203A (en) | 2014-12-12 | 2014-12-12 | Method for stepwise cooling cement clinker |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108358478A (en) * | 2018-03-09 | 2018-08-03 | 湖南科技大学 | A kind of method that the slugging of step calcination coal gas prepares cementitious material |
| CN109851259A (en) * | 2019-03-26 | 2019-06-07 | 王紫娴 | Special cement for masonry mortar and preparation method thereof |
| CN111718138A (en) * | 2020-07-01 | 2020-09-29 | 冯建新 | Novel dry-process cement clinker production device and process |
| CN111807726A (en) * | 2020-06-23 | 2020-10-23 | 湖北湖大天沭新能源材料工业研究设计院有限公司 | Sectional vertical type high-activity calcium oxide cooling device and method |
Citations (5)
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|---|---|---|---|---|
| JPS6170382A (en) * | 1984-09-13 | 1986-04-11 | 三菱重工業株式会社 | Cooling device for granular solid |
| CN86103486A (en) * | 1985-06-15 | 1986-12-10 | 奥伦斯坦和科贝尔股份公司 | Make the method and apparatus of white cement |
| JPH06247755A (en) * | 1993-02-23 | 1994-09-06 | Ishikawajima Harima Heavy Ind Co Ltd | Cement clinker cooler |
| CN1091820A (en) * | 1992-12-23 | 1994-09-07 | 弗·尔·斯米德恩公司 | The method of cooling particulate material and cooling device |
| CN104075570A (en) * | 2014-06-27 | 2014-10-01 | 中国铝业股份有限公司 | Clinker cooling method through sintering process |
-
2014
- 2014-12-12 CN CN201410768273.0A patent/CN104529203A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6170382A (en) * | 1984-09-13 | 1986-04-11 | 三菱重工業株式会社 | Cooling device for granular solid |
| CN86103486A (en) * | 1985-06-15 | 1986-12-10 | 奥伦斯坦和科贝尔股份公司 | Make the method and apparatus of white cement |
| CN1091820A (en) * | 1992-12-23 | 1994-09-07 | 弗·尔·斯米德恩公司 | The method of cooling particulate material and cooling device |
| JPH06247755A (en) * | 1993-02-23 | 1994-09-06 | Ishikawajima Harima Heavy Ind Co Ltd | Cement clinker cooler |
| CN104075570A (en) * | 2014-06-27 | 2014-10-01 | 中国铝业股份有限公司 | Clinker cooling method through sintering process |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108358478A (en) * | 2018-03-09 | 2018-08-03 | 湖南科技大学 | A kind of method that the slugging of step calcination coal gas prepares cementitious material |
| CN108358478B (en) * | 2018-03-09 | 2020-06-16 | 湖南科技大学 | Method for preparing cementing material by calcining coal gasification slag step by step |
| CN109851259A (en) * | 2019-03-26 | 2019-06-07 | 王紫娴 | Special cement for masonry mortar and preparation method thereof |
| CN111807726A (en) * | 2020-06-23 | 2020-10-23 | 湖北湖大天沭新能源材料工业研究设计院有限公司 | Sectional vertical type high-activity calcium oxide cooling device and method |
| CN111807726B (en) * | 2020-06-23 | 2022-04-29 | 湖北湖大天沭新能源材料工业研究设计院有限公司 | Sectional vertical type high-activity calcium oxide cooling device and method |
| CN111718138A (en) * | 2020-07-01 | 2020-09-29 | 冯建新 | Novel dry-process cement clinker production device and process |
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Application publication date: 20150422 |