CN101216254B - Heating picking process for promoting cement kiln residual heat generating efficiency - Google Patents
Heating picking process for promoting cement kiln residual heat generating efficiency Download PDFInfo
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- CN101216254B CN101216254B CN2007103048820A CN200710304882A CN101216254B CN 101216254 B CN101216254 B CN 101216254B CN 2007103048820 A CN2007103048820 A CN 2007103048820A CN 200710304882 A CN200710304882 A CN 200710304882A CN 101216254 B CN101216254 B CN 101216254B
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Abstract
The invention relates to a heat collection process for improving power generation efficiency using cement kiln residual heat, belonging to the technical field of power generation using cement kiln low-temperature residual heat. The process comprises the following steps of: mixing the residual low-temperature air (about 150 DEG C) from the tail portion of a grate cooler at a kiln hood and the residual intermediate-temperature waste gas (380-450 DEG C) from the middle portion of the grate cooler as the requirement of raw coal, and delivering to raw coal drying process of a coal-grinding system. The invention can generate power with more high-quality intermediate-temperature waste gas, improve effective cascading use of waste gas, and reduce the explosive risk of the coal-grinding system, so as to ensure safety production of the pulverized coal production system and save energy.
Description
Technical field
The present invention relates to cement kiln pure low-temperature cogeneration technology field, be widely used in a kind of heating picking process that improves cement kiln residual heat generating efficiency that the low-temperature flue gas waste heat generates electricity in the industry utilizations such as cement, iron and steel, building materials.
Background technology
For guarantee national economy continue, fast, develop in a healthy way, realize comprehensive utilization of resources, energy-conserving and environment-protective, National Development and Reform Committee requires enterprise " waste heat that produces in the production process etc. to be reclaimed and rationally utilizes ".Cement industry is the big power consumer, makes full use of new type nonaqueous cement production line exhaust gas discharged waste heat, carries out oven dry of former, fuel and pure low-temperature cogeneration, is effectively energy-saving and cost-reducing behave.
At present, Fig. 1 sees in cement kiln configuration pure low-temperature cogeneration system, generally extracts 380～450 ℃ middle temperature waste gas at kiln hood cooling machine 1 stage casing upper shell opening, after process expansion chamber 2 is crossed elimination bulky grain grit, enter kiln hood AQC waste heat boiler 3, after heat exchange, produce steam and generate electricity.Simultaneously, the waste gas at kiln hood cooling machine middle part also is sent to coal mill 4 and is used to dry raw coal.Coal mill and AQC waste heat boiler split the not homonymy at kiln hood cooling machine.In the expansion chamber gas outlet air-flow is separated, send into coal mill and kiln hood AQC waste heat boiler respectively by warm-air pipe.High temperature control valve 6,7 is installed, so that carry out the control and the switching of air-flow respectively on the two-way airduct.Remaining about the 150 ℃ low temperature wind of cooling drive end unit drains into kiln hood cottrell 5 by lingering remnants of past customs pipe, and 8 pairs of air-flows of the high temperature control valve on the lingering remnants of past customs pipe are regulated.The low temperature waste gas of discharging after the AQC residual heat boiler for exchanging heat and the cooling drive end unit lingering remnants of past customs are converged after the kiln hood cottrell purifies the back emptying.
Process analysis: when the middle temperature waste gas that cooling machine middle part is 380～450 ℃ was used to dry raw coal, because exhaust gas constituents is near the composition of hot-air herein, the oxygen content height had increased the danger that the coal grinding system explodes when temperature is high.In order to guarantee the safety in production of coal dust preparation system, the hot air duct upper shed of the coal of being everlasting mill adds the cold wind control valve, mixes cool ambient air, and entering the coal mill again after making the mist temperature reduce to about 180～200 ℃ carries out the raw coal oven dry.There are some drawbacks in this flow process:
1) additionally sucks cold air and mix with hot waste gas, increased the power consumption of production system to reduce EGT from the external world;
2) consider the comprehensive benefit of manufacture of cement and electricity generation system combination, should not influence the every index of manufacture of cement, make full use of under the prerequisite of waste gas residual heat, improve exhausted air quantity and the temperature of advancing waste heat boiler as far as possible,, and then improve the electricity generation system thermal efficiency with the raising steam parameter.This flow process has just reduced the exhausted air quantity that enters the AQC boiler after dividing diffluence coal mill with 360 ℃ of waste gas of part at middle part relatively, influences generating efficiency; Simultaneously, advance coal mill EGT, need mix after cool ambient air makes the mist temperature reduce to about 180～200 ℃, influence generating efficiency generally at 180～200 ℃;
3) the low temperature wind of about 150 ℃ of cooling drive end units directly discharges, and does not utilize, and does not cause energy waste.
4) if coal mill and AQC boiler are arranged in the cooling machine not during homonymy, both sides, cooling machine middle part are respectively extracted hot gas and are delivered to coal mill and AQC boiler respectively, cause two-way to tack, and cause the interior air turbulence of cooling machine, influence manufacture of cement.
Summary of the invention
In order to overcome the deficiencies in the prior art, make kiln hood used heat obtain more fully effectively utilizing, improve residual heat generating efficiency, the invention provides a kind of heating picking process that improves cement kiln residual heat generating efficiency; Can guarantee that more high-quality exhaust steam generates electricity, improve the effective cascade utilization of exhaust energy, and guarantee the safety in production of coal dust preparation system, energy savings.
For achieving the above object, the present invention adopts technical scheme as described below:
Described a kind of heating picking process that improves cement kiln residual heat generating efficiency is to adopt remaining about the 150 ℃ low temperature wind of cooling drive end unit to mix according to the demand of raw coal with 380～450 ℃ middle temperature waste gas, is sent to coal again and grinds and be used to dry raw coal; Coal mill and AQC waste heat boiler can be arranged in the same side of kiln hood cooling machine or homonymy not; When the same side at kiln hood cooling machine of coal mill and AQC waste heat boiler, its step is as follows:
1, near cooling drive end unit low temperature flue lingering remnants of past customs pipe, opening is drawn the low temperature airduct of coal mill and one first high temperature control valve is set thereon; This low temperature airduct that removes coal mill with draw from cooling machine middle part have the second high temperature control valve go that coal grinds warm airduct be communicated with, enter the coal grinding system again;
2, in the production, coal mill charging aperture is provided with the water analysis instrument, according to the raw coal moisture, by regulating the first high temperature control valve on the newly-installed low temperature airduct that removes coal mill, adjust cooling machine middle part simultaneously by the second high temperature controlling opening of valve on the middle temperature airduct that removes the coal mill behind the expansion chamber, guarantee that the raw coal oven dry uses the wind requirement, make a large amount of low temperature wind and a spot of in after warm wind mixes, enter coal mill oven dry raw coal;
3, the hot air duct diameter that removes coal mill is arranged on 16～20m/s according to air quantity, the air velocity of coal mill oven dry needs and calculates back rounding value;
4, go the hot air duct angle of coal mill to be controlled at and uply be not less than 45 °, descendingly be not less than 30 °, require field condition is designed the warm-air pipe support that this removes the coal mill according to this simultaneously;
5, all controls, detection signal enter computer DCS control system, realize long-range or manual control.
Because adopt aforesaid technical scheme, the present invention has following superiority:
This a kind of heating picking process that improves cement kiln residual heat generating efficiency is to utilize remaining about the 150 ℃ low temperature wind of cooling drive end unit to mix according to the demand of raw coal with 380～450 ℃ middle temperature waste gas, is sent to the coal mill again and is used to dry raw coal.Prevented composition, oxygen content height, the temperature height of middle temperature exhaust gas constituents, reduced the danger of coal grinding system blast, guaranteed the safety in production of coal dust preparation system, saved the energy near hot-air.Its advantage is:
1, warm waste gas enters kiln hood waste heat boiler in can guaranteeing more, can produce more high-quality steam and generate electricity, and improves the effective cascade utilization of exhaust energy.
2, according to the raw coal moisture, can directly utilize the low temperature wind of cooling drive end unit, or admixture a spot of in warm wind remove to dry raw coal, cement production system exhaust gas discharged heat is fully recycled.
3, with the extraneous cold wind contrast of extra admixture, reduce the power consumption of exhaust blower in the system, improved the performance curve of kiln hood high-temperature blower, need not change the kiln hood blower fan, reduced investment cost and electric cost.
Description of drawings
Fig. 1 is the process chart of former cement kiln residual heat generating;
Fig. 2 is the process chart of the cement kiln residual heat generating after improving;
Among the figure: 1-cooling machine; The 2-expansion chamber; The 3-AQC waste heat boiler; 4-coal mill; 5-kiln hood cottrell; 6,7,8,9-high temperature control valve;
The specific embodiment
As shown in Figure 2: this a kind of heating picking process that improves cement kiln residual heat generating efficiency is to adopt remaining about the 150 ℃ low temperature wind of cooling drive end unit to mix according to the demand of raw coal with 380～450 ℃ middle temperature waste gas, is sent to coal again and grinds and be used to dry raw coal; Its step is as follows:
1, near cooling drive end unit low temperature flue lingering remnants of past customs pipe, opening is drawn the low temperature airduct of coal mill and one first high temperature control valve 9 is set thereon; This low temperature airduct that removes coal mill with draw from cooling machine middle part have the second high temperature control valve 6 go that coal grinds warm airduct be communicated with, enter the coal grinding system again;
2, in the production, coal mill charging aperture is provided with the water analysis instrument, according to the raw coal moisture, by regulating the first high temperature control valve 9 on the newly-installed low temperature airduct that removes coal mill, adjust cooling machine middle part simultaneously by the second high temperature control valve, 6 apertures on the middle temperature airduct that removes the coal mill behind the expansion chamber, guarantee that the raw coal oven dry uses the wind requirement, make a large amount of low temperature wind and a spot of in after warm wind mixes, enter coal mill oven dry raw coal;
3, the hot air duct diameter that removes coal mill is arranged on 16～20m/s according to air quantity, the air velocity of coal mill oven dry needs and calculates back rounding value;
4, go the warm-air pipe angle of coal mill to be controlled at and uply be not less than 45 °, descendingly be not less than 30 °, require field condition is designed the warm-air pipe support that this removes the coal mill according to this simultaneously;
5, all controls, detection signal enter computer DCS control system, realize long-range or manual control.
During work, extract 380～450 ℃ middle temperature waste gas at the kiln hood cooling machine 1 stage casing upper shell opening of rotary kiln, cross elimination bulky grain grits through expansion chamber 2 after; When coal mill and AQC waste heat boiler the same side at kiln hood cooling machine, in the expansion chamber gas outlet air-flow is separated, enter kiln hood AQC waste heat boiler 3 by the low temperature airduct that removes the coal mill by high temperature control valve 7, after heat exchange, produce steam and generate electricity.Simultaneously, the waste gas at kiln hood cooling machine middle part is converged by remaining about the 150 ℃ low temperature wind of the second high temperature control valve 6 and cooling drive end unit by warm-air pipe, makes low temperature wind and middle temperature wind be sent to coal mill 4 in proportion by the adjusting high temperature control valve 8 and the first high temperature control valve 9 and is used to dry raw coal.Remaining about the 150 ℃ low temperature wind of cooling drive end unit is converged by the low temperature waste gas of discharging after high temperature control valve 8 that air-flow is regulated and the AQC residual heat boiler for exchanging heat by lingering remnants of past customs pipe and drains into kiln hood cottrell 5, emptying after the kiln hood cottrell purifies.
Claims (1)
1. heating picking process that improves cement kiln residual heat generating efficiency, it is characterized in that: be to adopt remaining about the 150 ℃ low temperature wind of kiln hood cooling drive end unit to mix according to the demand of raw coal, be sent to the coal mill again and be used to dry raw coal with the middle temperature waste gas at 380～450 ℃ at cooling machine middle part; Its step is as follows:
1), near cooling drive end unit low temperature flue lingering remnants of past customs pipe, opening is drawn the low temperature airduct of coal mill and one first high temperature control valve (9) is set thereon; This low temperature airduct that removes coal mill with draw from cooling machine middle part have the second high temperature control valve (6) go that coal grinds warm airduct be communicated with, enter the coal grinding system again;
2), in the production, coal mill charging aperture is provided with the water analysis instrument, according to the raw coal moisture, by regulating the first high temperature control valve (9) on the newly-installed low temperature airduct that removes coal mill, adjust cooling machine middle part simultaneously by second high temperature control valve (6) aperture on the middle temperature airduct that removes the coal mill behind the expansion chamber, guarantee that the raw coal oven dry uses the wind requirement, make a large amount of low temperature wind and a spot of in after warm wind mixes, enter coal mill oven dry raw coal;
3), the hot air duct diameter that removes coal mill is arranged on 16～20m/s according to air quantity, the air velocity of coal mill oven dry needs and calculates back rounding value;
4), go the warm-air pipe angle of coal mill to be controlled at uply to be not less than 45 °, descendingly be not less than 30 °, require field condition is designed the warm-air pipe support that this removes the coal mill according to this simultaneously;
5), all controls, detection signal enter computer DCS control system, realize long-range or manual control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007103048820A CN101216254B (en) | 2007-12-29 | 2007-12-29 | Heating picking process for promoting cement kiln residual heat generating efficiency |
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| CN2007103048820A CN101216254B (en) | 2007-12-29 | 2007-12-29 | Heating picking process for promoting cement kiln residual heat generating efficiency |
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| CN101216254A CN101216254A (en) | 2008-07-09 |
| CN101216254B true CN101216254B (en) | 2010-08-11 |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101598504B (en) * | 2009-07-03 | 2012-07-04 | 霍镰泉 | Method and device for controlling waste heat recovery system of kiln |
| CN101706668B (en) * | 2009-10-29 | 2011-08-31 | 华南理工大学 | Method and device for controlling induced draft temperature of grate cooler of cement afterheat generation system |
| WO2012019314A1 (en) * | 2010-08-09 | 2012-02-16 | 思安新能源股份有限公司 | Residual heat utilization system and method matched with energy level of cement kiln hood |
| WO2012027862A1 (en) * | 2010-09-01 | 2012-03-08 | 思安新能源股份有限公司 | Waste heat generation device with adjusting device of waste heat extracting opening and waste heat utilization system therefore |
| CN102345975A (en) * | 2011-02-21 | 2012-02-08 | 叶金辉 | Cement production line material drying temperature control method and device adopting waste heat power generation |
| CN105091611A (en) * | 2014-05-06 | 2015-11-25 | 武安市新峰水泥有限责任公司 | Coal mill grinding hot air pipe and power generation hot air pipe parallel device |
| CN106630706B (en) * | 2015-10-28 | 2019-04-12 | 南京凯盛国际工程有限公司 | Glue the method that moist calcareous material prepares cement slurry |
| CN107328245B (en) * | 2016-12-30 | 2018-12-21 | 华北水利水电大学 | A kind of double-work medium afterheat generating system |
| CN108253803A (en) * | 2017-12-06 | 2018-07-06 | 山东棱角建材科技有限公司 | A kind of device and technique for improving grate-cooler heat energy utilization |
| CN111750682A (en) * | 2019-03-29 | 2020-10-09 | 川崎重工业株式会社 | Waste heat recovery system and operation method thereof |
| CN112944926A (en) * | 2021-03-09 | 2021-06-11 | 文县祁连山水泥有限公司 | Cement waste heat kiln head boiler power generation system |
| CN114993060B (en) * | 2022-05-27 | 2024-01-19 | 中国中材国际工程股份有限公司 | Kiln head waste heat energy-saving utilization and safety production system |
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