CN107119156B - Method for increasing temperature of blast furnace top gas - Google Patents
Method for increasing temperature of blast furnace top gas Download PDFInfo
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- CN107119156B CN107119156B CN201710267836.1A CN201710267836A CN107119156B CN 107119156 B CN107119156 B CN 107119156B CN 201710267836 A CN201710267836 A CN 201710267836A CN 107119156 B CN107119156 B CN 107119156B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/06—Making pig-iron in the blast furnace using top gas in the blast furnace process
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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
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention discloses a method for increasing the temperature of blast furnace top gas, which comprises the following steps of (1) improving the temperature of sintered ore material; (2) the adjustment of the blast furnace operation system specifically comprises the following steps: firstly, controlling the oxygen enrichment capacity; secondly, controlling the coal ratio; thirdly, controlling wind pressure; fourthly, controlling the furnace top pressure and the differential pressure; fifthly, controlling the furnace temperature; sixthly, adjusting the direction of an upper material distribution system; and seventhly, reducing the cooling water quantity of the cooling wall at the upper part of the furnace body by 20-30 percent. The method for improving the temperature of the blast furnace top gas is reasonable in design, the temperature of the gas entering the box body can be guaranteed to be 80-260 ℃ by improving the temperature of the 3# blast furnace top gas, the phenomenon that water vapor is condensed when the temperature of the gas is lower than 80 ℃ to cause the scrapping of a dust removal cloth bag in the box body is avoided, the phenomenon that the service life of the dust removal cloth bag is shortened or the cloth bag is burnt in a short time when the temperature of the gas is higher than 260 ℃ is also avoided, and therefore the normal work of a dry dust removal system is guaranteed.
Description
Technical Field
The invention relates to the technical field of blast furnaces, in particular to a method for increasing the temperature of blast furnace top gas.
Background
The blast furnace dry dedusting is an advanced process for blast furnace gas purification at present. The dry cloth bag dust removal method has certain requirements on the temperature of blast furnace gas, and the temperature of raw gas entering a box body needs to be 80-260 ℃. If the temperature of the coal gas is lower than 80 ℃, the water vapor condensation phenomenon occurs, the wet coal gas can damp the bag-type dust removal through the bag-type dust removal, the dry blast furnace dust can be greatly accumulated when meeting the wet bag, and then the air holes of the bag-type dust removal bag are stuck, the dust removal capacity of the bag-type dust removal is reduced, and finally the dust removal bag in the box body is scrapped. If the temperature of the coal gas is higher than 260 ℃, the service life of the dust removal cloth bag is shortened or the cloth bag is burnt in a short time. Normally, the dust removal effect is best when the temperature of the blast furnace gas is between 120 ℃ and 220 ℃. Currently, 3# blast furnace (460 m)3) The abnormal condition of the 3# blast furnace dry dust removal system is caused by the low temperature of the top gas. Therefore, the invention provides a method for improving the temperature of the top gas of the 3# blast furnace, which can ensure that a dry dust removal system can work normally.
Disclosure of Invention
The invention aims to provide a method for improving the temperature of blast furnace top gas, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a method of increasing the temperature of blast furnace top gas comprising:
(1) the method for improving the temperature of the sintered ore material comprises the following specific steps:
the average temperature of the sintering ore fed into the blast furnace is more than or equal to 65 ℃, the single measurement data is not lower than 45 ℃, the temperature measurement point is arranged on a feeding belt of a No. 3 blast furnace groove, when the temperature of the sintering ore is measured, the distance between a temperature measurement gun and the sintering ore measurement point is required to be 955 +/-50 mm-1055 +/-50 mm, the measurement frequency is 1 time of measurement every 1.5-2.5 hours, the average temperature of the sintering ore fed into the blast furnace is the average value of the temperature data measured for multiple times, and the temperature data measured by the temperature measurement gun is recorded in a report and is stored in time;
(2) the adjustment of the blast furnace operation system specifically comprises the following steps:
firstly, controlling the oxygen enrichment amount: the upper limit of the oxygen-rich amount is controlled to be 3500m3Within/h, if the furnace top temperature still does not meet the requirement, the oxygen-rich amount is continuously reduced, and the lower limit of the oxygen-rich amount is controlled to be 2800m3More than h;
secondly, controlling the coal ratio: increasing the coal ratio, wherein the coal ratio is controlled at 150-;
thirdly, wind pressure control: the total amount of the coal gas is increased by increasing the air quantity, and the air quantity is increased to 1680m3Min, increasing the air pressure to 230-;
fourthly, controlling the furnace top pressure and the pressure difference: reducing the top pressure to 120-;
fifthly, furnace temperature control: improving the furnace temperature control level, wherein the furnace temperature is controlled to be 0.48 +/-0.050% -0.53 +/-0.050%;
sixthly, adjusting the direction of an upper material distribution system: the average air quantity reaches 1500-3In the time of/min, adopting a material distribution system for pressing edge coal gas;
and seventhly, reducing the cooling water quantity of the cooling wall at the upper part of the furnace body by 20-30 percent.
As a further scheme of the invention: the average temperature of the sintering ore fed into the blast furnace in the step (1) is more than or equal to 70 ℃, the single measurement data is not lower than 50 ℃, the temperature measurement point is on a feeding belt of a No. 3 blast furnace groove, when the temperature of the sintering ore is measured, the distance between a temperature measurement gun and the sintering ore measurement point is required to be 1000 +/-50 mm, the measurement frequency is 1 time of measurement every 2 hours, the average temperature of the sintering ore fed into the blast furnace is the average value of the temperature data measured for multiple times, and the temperature data measured by the temperature measurement gun is recorded in a report and is stored in time.
As a further scheme of the invention: said rich isThe upper limit of oxygen amount is controlled to 3000m3Within/h.
As a further scheme of the invention: the coal ratio was controlled at 155 kg/t.
As a further scheme of the invention: the furnace temperature is controlled to be 0.5 +/-0.050%.
As a further scheme of the invention: sixthly, the average air quantity reaches 1650m3And in the time of/min, adopting a material distribution system for pressing edge coal gas.
As a further scheme of the invention: step three, wind pressure control: the total amount of the coal gas is increased by increasing the air quantity, and the air quantity is increased to 1680m3The air pressure is increased to 255 kpa/min.
As a further scheme of the invention: step four, controlling the furnace top pressure and the pressure difference: the top pressure was reduced to 133 kpa.
Compared with the prior art, the invention has the beneficial effects that:
the method for improving the temperature of the blast furnace top gas is reasonable in design, the temperature of the gas entering the box body can be guaranteed to be 80-260 ℃ by improving the temperature of the 3# blast furnace top gas, the phenomenon that water vapor is condensed when the temperature of the gas is lower than 80 ℃ to cause the scrapping of a dust removal cloth bag in the box body is avoided, the phenomenon that the service life of the dust removal cloth bag is shortened or the cloth bag is burnt in a short time when the temperature of the gas is higher than 260 ℃ is also avoided, and therefore the normal work of a dry dust removal system is guaranteed.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Example 1
A method of increasing the temperature of blast furnace top gas comprising:
(1) the method for improving the temperature of the sintered ore material comprises the following specific steps:
the average temperature of the sintering ore entering the blast furnace is more than or equal to 65 ℃, the single measurement data is not lower than 45 ℃, the temperature measurement point is arranged on a feeding belt of a No. 3 blast furnace groove, when the temperature of the sintering ore is measured, the distance between a temperature measurement gun and the sintering ore measurement point is required to be 955 +/-50 mm, the working length measurement method is required to be standardized in the blast furnace working section, the measurement accuracy is ensured, the measurement frequency is 1 time of measurement every 1.5 hours, the average temperature of the sintering ore entering the blast furnace is the average value of the temperature data measured for multiple times, the temperature data measured by the temperature measurement gun is recorded in a report and is stored in time so as to be convenient for the sintering working section to look up;
(2) the adjustment of the blast furnace operation system specifically comprises the following steps:
firstly, controlling the oxygen enrichment amount: the upper limit of the oxygen-rich amount is controlled to be 3500m3Within/h, if the furnace top temperature still does not meet the requirement, the oxygen-rich amount is continuously reduced, and the lower limit of the oxygen-rich amount is controlled to be 2800m3More than h;
secondly, controlling the coal ratio: increasing the coal ratio, namely increasing the iron gas amount per ton by increasing the coal ratio, wherein the coal ratio is controlled to be 150 kg/t;
thirdly, wind pressure control: the total amount of the coal gas is increased by increasing the air quantity, and the air quantity is increased to 1680m3Min, increasing the wind pressure to 230 kpa;
fourthly, controlling the furnace top pressure and the pressure difference: reducing the top pressure to 120 kpa;
fifthly, furnace temperature control: improving the furnace temperature control level, wherein the furnace temperature is controlled to be 0.48 +/-0.050%;
sixthly, adjusting the direction of an upper material distribution system: should not take the measure of developing the edge gas to avoid the reduction of the gas utilization rate and the great increase of the fuel ratio, and the condition is met, namely the average wind quantity reaches 1500m3In the min, a material distribution system for pressing edge gas is adopted, and central gas flow is further developed, so that a measure for increasing the temperature of the furnace top is achieved;
and seventhly, the cooling water quantity of the cooling wall on the upper part of the furnace body is reduced by 20-30%, the heat loss is reduced, and the temperature of the coal gas is increased.
Example 2
A method of increasing the temperature of blast furnace top gas comprising:
(1) the method for improving the temperature of the sintered ore material comprises the following specific steps:
the average temperature of the sintering ore fed into the blast furnace is more than or equal to 65 ℃, the single measurement data is not lower than 45 ℃, the temperature measurement point is arranged on a feeding belt of a No. 3 blast furnace groove, when the temperature of the sintering ore is measured, the distance between a temperature measurement gun and the sintering ore measurement point is required to be 1055 +/-50 mm, the working length measurement method is required to be standardized in a blast furnace working section, the measurement accuracy is ensured, the measurement frequency is 1 time of measurement every 2.5 hours, the average temperature of the sintering ore fed into the blast furnace is the average value of the temperature data measured for multiple times, the temperature data measured by the temperature measurement gun is recorded in a report and is stored in time, so that the sintering working section can conveniently look up;
(2) the adjustment of the blast furnace operation system specifically comprises the following steps:
firstly, controlling the oxygen enrichment amount: the upper limit of the oxygen-rich amount is controlled to be 3500m3Within/h, if the furnace top temperature still does not meet the requirement, the oxygen-rich amount is continuously reduced, and the lower limit of the oxygen-rich amount is controlled to be 2800m3More than h;
secondly, controlling the coal ratio: increasing the coal ratio, namely increasing the iron gas amount per ton by increasing the coal ratio, wherein the coal ratio is controlled to be 160 kg/t;
thirdly, wind pressure control: the total amount of the coal gas is increased by increasing the air quantity, and the air quantity is increased to 1680m3Min, increasing the wind pressure to 260 kpa;
fourthly, controlling the furnace top pressure and the pressure difference: reducing the top pressure to 140 kpa;
fifthly, furnace temperature control: improving the furnace temperature control level, and controlling the furnace temperature to be 0.53 +/-0.050%;
sixthly, adjusting the direction of an upper material distribution system: should not take the measure of developing the edge gas to avoid the reduction of the gas utilization rate and the great increase of the fuel ratio, and meet the condition that the average wind rate reaches 1800m3In the min, a material distribution system for pressing edge gas is adopted, and central gas flow is further developed, so that a measure for increasing the temperature of the furnace top is achieved;
and seventhly, the cooling water quantity of the cooling wall on the upper part of the furnace body is reduced by 20-30%, the heat loss is reduced, and the temperature of the coal gas is increased.
Example 3
A method of increasing the temperature of blast furnace top gas comprising:
(1) the method for improving the temperature of the sintered ore material comprises the following specific steps:
the average temperature of the sintering ore fed into the blast furnace in the step (1) is more than or equal to 70 ℃, the single measurement data is not lower than 50 ℃, the temperature measurement point is on a feeding belt of a No. 3 blast furnace groove, the distance between a temperature measurement gun and the sintering ore measurement point is required to be 1000 +/-50 mm when the temperature of the sintering ore is measured, the working length measurement method is required to be standardized in a blast furnace working section, the measurement accuracy is ensured, the measurement frequency is 1 measurement time every 2 hours, the average temperature of the sintering ore fed into the blast furnace is the average value of the temperature data measured for multiple times, the temperature data measured by the temperature measurement gun is recorded in a report and is stored in time so as to be convenient for the sintering working section to look up;
(2) the adjustment of the blast furnace operation system specifically comprises the following steps:
firstly, controlling the oxygen enrichment amount: the upper limit of the oxygen-rich amount is controlled to 3000m3Within/h, if the furnace top temperature still does not meet the requirement, the oxygen-rich amount is continuously reduced, and the lower limit of the oxygen-rich amount is controlled to be 2800m3More than h;
secondly, controlling the coal ratio: increasing the coal ratio, namely increasing the iron gas amount per ton by increasing the coal ratio, wherein the coal ratio is controlled at 155 kg/t;
thirdly, wind pressure control: the heat value of the gas is improved by increasing the total amount of the gas by increasing the air quantity which is 1550m from the original value3The/min is increased to 1680m3Min, increasing the wind pressure from 245kpa to 255 kpa;
fourthly, controlling the furnace top pressure and the pressure difference: the furnace top pressure is reduced to 133kpa from the original 140kpa by reducing the furnace top pressure, increasing the air quantity entering the furnace and increasing the coal gas quantity;
fifthly, furnace temperature control: improving the furnace temperature control level, wherein the furnace temperature is controlled to be 0.50 +/-0.050%;
sixthly, adjusting the direction of an upper material distribution system: should not take the measure of developing the edge gas to avoid the reduction of the gas utilization rate and the great increase of the fuel ratio, and meet the condition that the average wind volume reaches 1650m3In the min, a material distribution system for pressing edge gas is adopted, and central gas flow is further developed, so that a measure for increasing the temperature of the furnace top is achieved;
and seventhly, the cooling water quantity of the cooling wall on the upper part of the furnace body is reduced by 20-30%, the heat loss is reduced, and the temperature of the coal gas is increased.
Example 4
A method of increasing the temperature of blast furnace top gas comprising:
(1) the method for improving the temperature of the sintered ore material comprises the following specific steps:
the average temperature of the sintering ore fed into the blast furnace in the step (1) is more than or equal to 75 ℃, the single measurement data is not lower than 60 ℃, the temperature measurement point is on a feeding belt of a No. 3 blast furnace groove, when the temperature of the sintering ore is measured, the distance between a temperature measurement gun and the sintering ore measurement point is required to be 1025 +/-50 mm, the length measurement method is required to be standardized in the blast furnace section, the measurement accuracy is ensured, the measurement frequency is 1 measurement time every 1.8 hours, the average temperature of the sintering ore fed into the blast furnace is the average value of the temperature data measured for multiple times, the temperature data measured by the temperature measurement gun is recorded in a report and is stored in time, so that the sintering section can be consulted conveniently;
(2) the adjustment of the blast furnace operation system specifically comprises the following steps:
firstly, controlling the oxygen enrichment amount: the upper limit of the oxygen-rich amount is controlled to be 2500m3Within/h, if the furnace top temperature still does not meet the requirement, the oxygen-rich amount is continuously reduced, and the lower limit of the oxygen-rich amount is controlled to be 2800m3More than h;
secondly, controlling the coal ratio: increasing the coal ratio, namely increasing the iron gas amount per ton by increasing the coal ratio, wherein the coal ratio is controlled at 152 kg/t;
thirdly, wind pressure control: the total amount of the coal gas is increased by increasing the air quantity, and the air quantity is increased to 1680m3Min, increasing the wind pressure to 240 kpa;
fourthly, controlling the furnace top pressure and the pressure difference: reducing the top pressure to 130 kpa;
fifthly, furnace temperature control: improving the furnace temperature control level, wherein the furnace temperature is controlled to be 0.51 +/-0.050%;
sixthly, adjusting the direction of an upper material distribution system: should not take the measure of developing the edge gas to avoid the reduction of the gas utilization rate and the great increase of the fuel ratio, and the condition is met, namely the wind quantity reaches 1610m on average3In the min, a material distribution system for pressing edge gas is adopted, and central gas flow is further developed, so that a measure for increasing the temperature of the furnace top is achieved;
and seventhly, the cooling water quantity of the cooling wall on the upper part of the furnace body is reduced by 20-30%, the heat loss is reduced, and the temperature of the coal gas is increased.
The method for improving the temperature of the blast furnace top gas is reasonable in design, the temperature of the gas entering the box body can be guaranteed to be 80-260 ℃ by improving the temperature of the 3# blast furnace top gas, the phenomenon that water vapor is condensed when the temperature of the gas is lower than 80 ℃ to cause the scrapping of a dust removal cloth bag in the box body is avoided, the phenomenon that the service life of the dust removal cloth bag is shortened or the cloth bag is burnt in a short time when the temperature of the gas is higher than 260 ℃ is also avoided, and therefore the normal work of a dry dust removal system is guaranteed.
Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.
Claims (7)
1. A method of increasing the temperature of blast furnace top gas, comprising:
(1) the method for improving the temperature of the sintered ore material comprises the following specific steps:
460m3the average temperature of the sintering ore fed into the blast furnace is more than or equal to 65 ℃, the single measurement data is not lower than 45 ℃, the temperature measurement point is arranged on a feeding belt of a No. 3 blast furnace groove, when the temperature of the sintering ore is measured, the distance between a temperature measurement gun and the sintering ore measurement point is required to be 955 +/-50 mm-1055 +/-50 mm, the measurement frequency is 1 time of measurement every 1.5-2.5 hours, the average temperature of the sintering ore fed into the blast furnace is the average value of the temperature data measured for multiple times, and the temperature data measured by the temperature measurement gun is recorded in a report and is stored in time;
(2) the adjustment of the blast furnace operation system specifically comprises the following steps:
firstly, controlling the oxygen enrichment amount: the upper limit of the oxygen-rich amount is controlled to be 3500m3Within/h, if the furnace top temperature still does not meet the requirement, the oxygen-rich amount is continuously reduced, and the lower limit of the oxygen-rich amount is controlled to be 2800m3More than h;
secondly, controlling the coal ratio: increasing the coal ratio, wherein the coal ratio is controlled at 150-;
thirdly, wind pressure control: the total amount of the coal gas is increased by increasing the air quantity, and the air quantity is increased to 1680m3Min, increasing the air pressure to 230-;
fourthly, controlling the furnace top pressure and the pressure difference: reducing the top pressure to 120-;
fifthly, furnace temperature control: improving the furnace temperature control level, and controlling the furnace temperature to be 0.48-0.53%;
sixthly, adjusting the direction of an upper material distribution system: the average air quantity reaches 1500-3In the time of/min, adopting a material distribution system for pressing edge coal gas;
and seventhly, reducing the cooling water quantity of the cooling wall at the upper part of the furnace body by 20-30 percent.
2. The method for increasing the temperature of blast furnace top gas according to claim 1, wherein the step (1)460m3The average temperature of the sintering ore fed into the blast furnace is more than or equal to 70 ℃, the single measurement data is not lower than 50 ℃, the temperature measurement point is arranged on a feeding belt of a No. 3 blast furnace groove, when the temperature of the sintering ore is measured, the distance between a temperature measurement gun and the sintering ore measurement point is required to be 1000 +/-50 mm, the measurement frequency is 1 time of measurement every 2 hours, the average temperature of the sintering ore fed into the blast furnace is the average value of the temperature data measured for multiple times, and the temperature data measured by the temperature measurement gun is recorded in a report and is stored in time.
3. The method for increasing the temperature of blast furnace top gas according to claim 1, wherein the upper limit of oxygen-rich amount is controlled to 3000m3Within/h.
4. The method for increasing the temperature of blast furnace top gas according to claim 1, wherein the coal ratio is controlled to 155 kg/t.
5. The method for increasing the temperature of the blast furnace top gas according to claim 1, wherein the air volume reaches 1650m on average in the sixth step3And in the time of/min, adopting a material distribution system for pressing edge coal gas.
6. The method for increasing the temperature of the blast furnace top gas according to claim 1, wherein the third step is wind pressure control: the total amount of the coal gas is increased by increasing the air quantity, and the air quantity is increased to 1680m3The air pressure is increased to 255 kpa/min.
7. The method for increasing the temperature of blast furnace top gas according to claim 1, wherein said step four, top pressure and differential pressure control: the top pressure was reduced to 133 kpa.
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| CN108060281B (en) * | 2017-12-04 | 2019-08-23 | 山西太钢不锈钢股份有限公司 | A kind of method of blast furnace drop furnace temperature |
| CN108642219A (en) * | 2018-04-24 | 2018-10-12 | 武汉钢铁有限公司 | A method of improving blast furnace top gas temperature |
| CN114807471A (en) * | 2022-05-07 | 2022-07-29 | 中冶赛迪工程技术股份有限公司 | Furnace top gas temperature regulating and controlling process and system |
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