CN102643038A - Process for calcining high-activity lime by utilizing low-heating value blast furnace coal gas - Google Patents
Process for calcining high-activity lime by utilizing low-heating value blast furnace coal gas Download PDFInfo
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- CN102643038A CN102643038A CN2012100891191A CN201210089119A CN102643038A CN 102643038 A CN102643038 A CN 102643038A CN 2012100891191 A CN2012100891191 A CN 2012100891191A CN 201210089119 A CN201210089119 A CN 201210089119A CN 102643038 A CN102643038 A CN 102643038A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills
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Abstract
The invention relates to a process for calcining high-activity lime by utilizing low-heating value blast furnace coal gas in the field of lime calcination. The process comprises the steps that: a burner for low-heating value coal gas, which is used for respectively introducing the preheated low-heating value blast furnace coal gas as well as preheated converter coal gas into a kiln head of a rotary kiln, is adopted, and then the burner for the low-heating value coal gas is utilized for spraying the low-heating value blast furnace coal gas and the converter coal gas into the rotary kiln to calcine the high-activity lime. The process has the beneficial effect that as the low-heating value blast furnace coal gas is adopted for replacing high-heat value coke oven coal gas to be taken as a fuel when the high-activity lime is calcined in the rotary kiln in the process, the existing discarded low-heating value blast furnace coal gas is effectively utilized to create the economic benefit for user enterprises.
Description
[technical field]
The present invention relates to the lime calcining field, especially relate to a kind of technology of utilizing low combustion value furnace gas calcining high reactivity degree lime.
[background technology]
Known; The iron and steel enterprise of China has a large amount of rich situation of low combustion value furnace gas, simultaneously, because the utility value of low combustion value furnace gas is not high and it utilizes cost higher; So many iron and steel enterprises directly are discharged into these blast furnace gases in the air, be commonly called as " point day lamp "; Yet; Such discharging is contaminate environment but also waste resource not only; But also be against the policy of China about energy-saving and emission-reduction development low-carbon economy, therefore, how rational and effective utilizes these low combustion value furnace gas to become one of problem of each relevant greatly iron and steel enterprise and designing institute's research; Meanwhile; Owing to adopt the quality of high reactivity degree lime steel-making can obviously raising steel, the output that increases steel, reduction smelting cost and stable smelting operation; And can create good condition for smelting robotization; Therefore, the iron and steel enterprise of China all has the calcined by rotary kiln high reactivity degree lime production line of oneself basically; But; Because existing calcined by rotary kiln high reactivity degree lime technology need consume the mixed gas that reaches certain calorific value after a large amount of coke-oven gas or coke-oven gas and coal gas of converter mix; Therefore; If can these a large amount of rich low combustion value furnace gas be applied in the technology of calcined by rotary kiln high reactivity degree lime, this will and reduce steel-making cost and play great promoter action environment protection, the utilization of resources.
[summary of the invention]
In order to overcome the deficiency in the background technology; The invention provides a kind of technology of utilizing low combustion value furnace gas calcining high reactivity degree lime; Fuel when described process using low combustion value furnace gas substitutes the high heating value coke-oven gas as lime rotary kiln calcining high reactivity degree lime; Thereby effectively utilized the low combustion value furnace gas that goes out of use at present, for enterprise has created extra income.
For realizing the foregoing invention purpose, the present invention adopts following technical scheme:
A kind of technology of utilizing low combustion value furnace gas calcining high reactivity degree lime, described process step is:
A, with 50% fuel of low combustion value furnace gas total amount as the gas preheating stove, and utilize the gas preheating stove remaining low combustion value furnace gas to be sprayed into the release of heat of burning in the gas preheating stove with burner;
B, low combustion value furnace gas and the coal gas of converter through the gas preheating stove are preheated to 440～450 ℃;
C, the low-heat value gas that a wind of the low combustion value furnace gas after the preheating and coal gas of converter and primary air fan is passed to rotary kiln end are respectively used burner;
D, when needs incinerating Wingdale enters in the rotary kiln; In rotary kiln, spray into low combustion value furnace gas and coal gas of converter and a wind through low-heat value gas with burner; And low combustion value furnace gas and coal gas of converter are mixed in rotary kiln; Then, Wingdale is calcined, thereby generated high reactivity degree lime through the mixed gas in the burning rotary kiln.
The described technology of utilizing low combustion value furnace gas calcining high reactivity degree lime, what the gas preheating stove that uses in the said technology adopted is efficient tubular exchanger, the complex heat transfer coefficient K=40～50W/m2. of this efficient tubular exchanger ℃.
The described technology of utilizing low combustion value furnace gas calcining high reactivity degree lime, the coal gas of converter calorific value that uses in the said technology is 6600～6800KJ/Nm3, the low combustion value furnace gas calorific value is 2900～3100KJ/Nm3.
The described technology of utilizing low combustion value furnace gas calcining high reactivity degree lime, the tolerance ratio of low combustion value furnace gas that in rotary kiln, sprays in the said technology and coal gas of converter is 1:2.
The described technology of utilizing low combustion value furnace gas calcining high reactivity degree lime; The flue gas that low combustion value furnace gas in the said technology and coal gas of converter are produced after by gas preheating stove Btu utilization mixes with the cold wind that cold blast valve mixes, and when temperature is adjusted to below 200 ℃ through the discharging of smoke evacuation induced draft fan.
The described technology of utilizing low combustion value furnace gas calcining high reactivity degree lime; The high reactivity degree lime calcining flow process of using said technology is: earlier in the receiver bin at Wingdale feeding shaft preheater top; Utilize the tubular type feeder in the shaft preheater that Wingdale is sent into the circular channel in the shaft preheater device again; Evenly be preheated to 850～950 ℃ by rotary kiln waste gas in the process that Wingdale is slowly moved down in the circular channel, decompose thereby beginning is preliminary; Next, the Wingdale after preliminary the decomposition is promoted by the hydraulic push rod on the shaft preheater, and enters in the rotary kiln through feed compartment, and then by the low combustion value furnace gas of rotary kiln internal combustion and the mixed gas of coal gas of converter Wingdale is calcined; Lime after the calcining gets into shaft cooler through the rotary kiln end dumping device; And then the lime in the shaft cooler is carried out air blast with overfire air fan; And be cooled to below 100 ℃ in the inlet variable valve that is provided with on the overfire air fan and secondary air flow distribution valve temperature lime through comprehensive adjustment; And then utilizing the chain bucket transfer roller that lime is seen off, the lime of seeing off is high reactivity degree lime.
The described technology of utilizing low combustion value furnace gas calcining high reactivity degree lime; In the high reactivity degree lime calcining flow process of using said technology; The waste gas that rotary kiln produces is cooled to below 180 ℃ through mechanical air cooler earlier; And then, extract extremely corresponding chimney through high-temperature blower more at last and discharge through the dedusting of high temperature long bag and low pulse bag dust collector; Wherein, settled dust drains into the case that connects material accordingly through the chain conveyor of correspondence respectively in mechanical air cooler and high temperature long bag and low pulse bag dust collector.
The described technology of utilizing low combustion value furnace gas calcining high reactivity degree lime, the high temperature long bag and low pulse bag dust collector of using in the high reactivity degree lime calcining flow process of said technology is provided with the bypass protection function.
The described technology of utilizing low combustion value furnace gas calcining high reactivity degree lime when using described technology, can use coke-oven gas to use the burner igniting or be revolution kilning kiln as the gas preheating stove.
The described technology of utilizing low combustion value furnace gas calcining high reactivity degree lime, described rotary kiln adopts and adapts to low-heat value gas, and possesses the reducing kiln of high-temperature, big flue gas flow characteristics.
Owing to adopted technique scheme, the present invention to have following beneficial effect:
The technology of utilizing low combustion value furnace gas calcining high reactivity degree lime of the present invention; Fuel when described process using low combustion value furnace gas substitutes the high heating value coke-oven gas as lime rotary kiln calcining high reactivity degree lime; Thereby a large amount of depleted low combustion value furnace gas of present quilt have not only effectively been utilized; But also saved the high heating value usury greatly, and then created extra economic return for enterprise with the coke-oven gas that is worth.
[embodiment]
Can explain the present invention in more detail through following embodiment, open the object of the invention is intended to protect all variations and the improvement in the scope of the invention, and the present invention is not limited to following embodiment;
The process step of low combustion value furnace gas calcining high reactivity degree lime that utilizes of the present invention is following:
A, to choose calorific value earlier be 3000KJ/Nm
3Low combustion value furnace gas, and with 50% fuel of this low combustion value furnace gas total amount, and then utilize the gas preheating stove remaining low combustion value furnace gas to be sprayed into the release of heat of burning in the gas preheating stove with burner as the gas preheating stove; What described gas preheating stove adopted is efficient tubular exchanger, and the complex heat transfer coefficient K=45W/m of this efficient tubular exchanger
2. ℃;
B, low combustion value furnace gas in the gas preheating stove and the coal gas of converter through the gas preheating stove are preheated to 450 ℃; Described coal gas of converter calorific value is 6700KJ/Nm
3Wherein, the flue gas that described low combustion value furnace gas and coal gas of converter are produced after by gas preheating stove Btu utilization mixes with the cold wind that cold blast valve mixes, and through the smoke evacuation induced draft fan temperature is adjusted to the mixed gas discharging below 200 ℃;
C, the low-heat value gas that a wind of the low combustion value furnace gas after the preheating and coal gas of converter and primary air fan is passed to rotary kiln end are respectively used burner;
D, when needs incinerating Wingdale enters in the rotary kiln; In rotary kiln, spray into low combustion value furnace gas and coal gas of converter and a wind through low-heat value gas with burner; And low combustion value furnace gas and coal gas of converter are mixed in rotary kiln; The tolerance ratio of low combustion value furnace gas that in rotary kiln, sprays at this moment, and coal gas of converter is 1:2; Then, Wingdale is calcined, thereby generated high reactivity degree lime through the mixed gas in the burning rotary kiln.
During the described technology of embodiment of the present invention; Can adopt following high reactivity degree lime calcining flow process: earlier in the receiver bin at Wingdale feeding shaft preheater top; Utilize the tubular type feeder in the shaft preheater that Wingdale is sent into the circular channel in the shaft preheater device again; Evenly be preheated to 900 ℃ by rotary kiln waste gas in the process that Wingdale is slowly moved down in the circular channel, decompose thereby beginning is preliminary; Next, the Wingdale after preliminary the decomposition is promoted by the hydraulic push rod on the shaft preheater, and enters in the rotary kiln through feed compartment, through using technology of the present invention Wingdale is calcined then; Lime after the calcining gets into shaft cooler through the rotary kiln end dumping device; And then the lime in the shaft cooler is carried out air blast with overfire air fan; And be cooled to below 100 ℃ in the inlet variable valve that is provided with on the overfire air fan and secondary air flow distribution valve temperature lime through comprehensive adjustment; And then utilizing the chain bucket transfer roller that lime is seen off, the lime of seeing off is high reactivity degree lime; In this process; The waste gas that rotary kiln produces is cooled to below 180 ℃ through mechanical air cooler earlier; And then carry out dedusting through the high temperature long bag and low pulse bag dust collector that is provided with the bypass protection function, extract to corresponding chimney through high-temperature blower more at last and discharge; Wherein, settled dust drains into the case that connects material accordingly through the chain conveyor of correspondence respectively in mechanical air cooler and high temperature long bag and low pulse bag dust collector.
As required, when using described technology, can use coke-oven gas to light a fire with burner, or when revolution kilning kiln, use coke-oven gas as the gas preheating stove; In addition, for further improving the performance of said technology, the rotary kiln that uses in the said technology adopts can adapt to low-heat value gas, and possesses the reducing kiln of high-temperature, big flue gas flow characteristics.
Carefully not stating in the above content is prior art partly, does not state so run business into particular one.
Claims (10)
1. technology of utilizing low combustion value furnace gas calcining high reactivity degree lime, it is characterized in that: described process step is:
A, with 50% fuel of low combustion value furnace gas total amount as the gas preheating stove, and utilize the gas preheating stove remaining low combustion value furnace gas to be sprayed into the release of heat of burning in the gas preheating stove with burner;
B, low combustion value furnace gas and the coal gas of converter through the gas preheating stove are preheated to 440～450 ℃;
C, the low-heat value gas that a wind of the low combustion value furnace gas after the preheating and coal gas of converter and primary air fan is passed to rotary kiln end are respectively used burner;
D, when needs incinerating Wingdale enters in the rotary kiln; In rotary kiln, spray into low combustion value furnace gas and coal gas of converter and a wind through low-heat value gas with burner; And low combustion value furnace gas and coal gas of converter are mixed in rotary kiln; Then, Wingdale is calcined, thereby generated high reactivity degree lime through the mixed gas in the burning rotary kiln.
2. the technology of utilizing low combustion value furnace gas calcining high reactivity degree lime according to claim 1; It is characterized in that: what the gas preheating stove that uses in the said technology adopted is efficient tubular exchanger, the complex heat transfer coefficient K=40～50W/m2. of this efficient tubular exchanger ℃.
3. the technology of utilizing low combustion value furnace gas calcining high reactivity degree lime according to claim 1, it is characterized in that: the coal gas of converter calorific value that uses in the said technology is 6600～6800KJ/Nm3, the low combustion value furnace gas calorific value is 2900～3100KJ/Nm3.
4. the technology of utilizing low combustion value furnace gas calcining high reactivity degree lime according to claim 1, it is characterized in that: the tolerance ratio of low combustion value furnace gas that in rotary kiln, sprays in the said technology and coal gas of converter is 1:2.
5. the technology of utilizing low combustion value furnace gas calcining high reactivity degree lime according to claim 1; It is characterized in that: the flue gas that low combustion value furnace gas in the said technology and coal gas of converter are produced after by gas preheating stove Btu utilization mixes with the cold wind that cold blast valve mixes, and when temperature is adjusted to below 200 ℃ through the discharging of smoke evacuation induced draft fan.
6. the technology of utilizing low combustion value furnace gas calcining high reactivity degree lime according to claim 1; It is characterized in that: the high reactivity degree lime calcining flow process of using said technology is: earlier in the receiver bin at Wingdale feeding shaft preheater top; Utilize the tubular type feeder in the shaft preheater that Wingdale is sent into the circular channel in the shaft preheater device again; Evenly be preheated to 850～950 ℃ by rotary kiln waste gas in the process that Wingdale is slowly moved down in the circular channel, decompose thereby beginning is preliminary; Next, the Wingdale after preliminary the decomposition is promoted by the hydraulic push rod on the shaft preheater, and enters in the rotary kiln through feed compartment, and then by the low combustion value furnace gas of rotary kiln internal combustion and the mixed gas of coal gas of converter Wingdale is calcined; Lime after the calcining gets into shaft cooler through the rotary kiln end dumping device; And then the lime in the shaft cooler is carried out air blast with overfire air fan; And be cooled to below 100 ℃ in the inlet variable valve that is provided with on the overfire air fan and secondary air flow distribution valve temperature lime through comprehensive adjustment; And then utilizing the chain bucket transfer roller that lime is seen off, the lime of seeing off is high reactivity degree lime.
7. the technology of utilizing low combustion value furnace gas calcining high reactivity degree lime according to claim 6; It is characterized in that: in the high reactivity degree lime calcining flow process of using said technology; The waste gas that rotary kiln produces is cooled to below 180 ℃ through mechanical air cooler earlier; And then, extract extremely corresponding chimney through high-temperature blower more at last and discharge through the dedusting of high temperature long bag and low pulse bag dust collector; Wherein, settled dust drains into the case that connects material accordingly through the chain conveyor of correspondence respectively in mechanical air cooler and high temperature long bag and low pulse bag dust collector.
8. the technology of utilizing low combustion value furnace gas calcining high reactivity degree lime according to claim 7 is characterized in that: the high temperature long bag and low pulse bag dust collector of using in the high reactivity degree lime calcining flow process of said technology is provided with the bypass protection function.
9. the technology of utilizing low combustion value furnace gas calcining high reactivity degree lime according to claim 1 is characterized in that: when using described technology, can use coke-oven gas to use the burner igniting or be revolution kilning kiln as the gas preheating stove.
10. according to claim 1 or the 6 described technologies of utilizing low combustion value furnace gas calcining high reactivity degree lime, it is characterized in that: the rotary kiln in the said technology adopts and adapts to low-heat value gas, and possesses the reducing kiln of high-temperature, big flue gas flow characteristics.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102992658A (en) * | 2012-11-28 | 2013-03-27 | 江苏永钢集团有限公司 | Lime burning device employing low-heat-value gas |
| CN104030580A (en) * | 2013-03-07 | 2014-09-10 | 上海宝冶建设工业炉工程技术有限公司 | Combustion system of sleeve limekiln using blast furnace gas |
| CN105271842A (en) * | 2015-09-30 | 2016-01-27 | 山东钢铁股份有限公司 | Method for calcining active lime by use of mixed gas in lime sleeve kiln |
| CN105645792A (en) * | 2016-03-01 | 2016-06-08 | 济南力士源机电科技有限公司 | Method for roasting lime with blast furnace gas in sleeve lime kiln |
| CN110627384A (en) * | 2019-10-18 | 2019-12-31 | 湖北大学 | Process method for preparing active calcium oxide by oxygen-enriched calcination |
| CN112229205A (en) * | 2020-09-29 | 2021-01-15 | 中信重工机械股份有限公司 | Active lime calcining system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101462698A (en) * | 2009-01-13 | 2009-06-24 | 南京师范大学 | Industrial method for cyclic utilization of ironmaking production desulfurized gypsum and blast furnace gas |
-
2012
- 2012-03-30 CN CN2012100891191A patent/CN102643038B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101462698A (en) * | 2009-01-13 | 2009-06-24 | 南京师范大学 | Industrial method for cyclic utilization of ironmaking production desulfurized gypsum and blast furnace gas |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102992658A (en) * | 2012-11-28 | 2013-03-27 | 江苏永钢集团有限公司 | Lime burning device employing low-heat-value gas |
| CN104030580A (en) * | 2013-03-07 | 2014-09-10 | 上海宝冶建设工业炉工程技术有限公司 | Combustion system of sleeve limekiln using blast furnace gas |
| CN105271842A (en) * | 2015-09-30 | 2016-01-27 | 山东钢铁股份有限公司 | Method for calcining active lime by use of mixed gas in lime sleeve kiln |
| CN105271842B (en) * | 2015-09-30 | 2017-04-19 | 山东钢铁股份有限公司 | Method for calcining active lime by use of mixed gas in lime sleeve kiln |
| CN105645792A (en) * | 2016-03-01 | 2016-06-08 | 济南力士源机电科技有限公司 | Method for roasting lime with blast furnace gas in sleeve lime kiln |
| CN105645792B (en) * | 2016-03-01 | 2017-07-21 | 济南力士源机电科技有限公司 | A kind of method that sleeve lime kiln is calcined lime using blast furnace gas |
| CN110627384A (en) * | 2019-10-18 | 2019-12-31 | 湖北大学 | Process method for preparing active calcium oxide by oxygen-enriched calcination |
| CN112229205A (en) * | 2020-09-29 | 2021-01-15 | 中信重工机械股份有限公司 | Active lime calcining system |
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| CN102643038B (en) | 2013-12-18 |
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Inventor after: Zhang Ping Inventor after: Lv Jianpeng Inventor after: Cao Hui Inventor after: Xu Weige Inventor after: Lei Zhongming Inventor after: Ding Kai Inventor before: Zhang Ping Inventor before: Lv Jianpeng Inventor before: Cao Hui Inventor before: Xu Weige Inventor before: Lei Zhongming |
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Free format text: CORRECT: INVENTOR; FROM: ZHANG PING LV JIANPENG CAO HUI XU WEIGE LEI ZHONGMING TO: ZHANG PING LV JIANPENG CAO HUI XU WEIGE LEI ZHONGMING DING KAI |
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