CN210420008U - Blast furnace iron notch oxygen enrichment device - Google Patents
Blast furnace iron notch oxygen enrichment device Download PDFInfo
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- CN210420008U CN210420008U CN201921255185.5U CN201921255185U CN210420008U CN 210420008 U CN210420008 U CN 210420008U CN 201921255185 U CN201921255185 U CN 201921255185U CN 210420008 U CN210420008 U CN 210420008U
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Abstract
The utility model relates to the field of blast furnace oxygen enrichment iron-making production, in particular to a blast furnace taphole oxygen enrichment device; the system comprises a host machine, an analysis system and an oxygen lance, wherein the host machine system comprises a gas mixing bag, the gas mixing bag is connected with a compressed air inlet and an oxygen inlet, the analysis system comprises an oxygen analyzer and a sampling and temperature measuring device, a zirconia probe of the oxygen analyzer extends into the sampling device, and the sampling device is connected with the gas mixing bag through a sampling pipe; the temperature measuring device comprises a first temperature measuring thermocouple with a probe at a furnace mouth and a second temperature measuring thermocouple with a probe in the blast furnace, the oxygen lance system comprises an oxygen lance head and an air inlet pipe in the furnace mouth, one end of the air inlet pipe is connected with the oxygen lance head through a quick connector, and the other end of the air inlet pipe is connected with an air outlet pipe on the gas mixing bag; the system effectively improves the accurate oxygen supply and adjustment of the oxygen enrichment of the blast furnace taphole, ensures that the normal oxygen demand of the molten iron is kept in the production, achieves the effective judgment of the tapping of the molten iron through the temperature measuring device, further improves the accurate control of the production, and further improves the quality of products.
Description
Technical Field
The utility model relates to the technical field of blast furnace oxygen enrichment ironmaking production, in particular to a blast furnace taphole oxygen enrichment device.
Background
The blast furnace oxygen enrichment is that industrial oxygen is added into blast furnace air blast to improve the oxygen-containing concentration of the blast air and strengthen fuel combustion in a tuyere area, thereby improving the pig iron yield, and is a blast furnace strengthening smelting technology. After oxygen-enriched blowing, the nitrogen content is relatively reduced, the concentration of reducing agent CO in the generated coal gas is increased, and particularly when fuel with high H/C ratio is blown, H in the coal gas2The content is increased, which is beneficial to the development of indirect reduction of a blast furnace and reduces the coke consumption. The coke ratio is reduced by about O.5% when oxygen is added by 1% in blast, but if the oxygen content in blast is too high, the blast air quantity is reduced, and when the air temperature is not changed, the heat brought into the furnace by blast air is reduced, which is not beneficial to reducing the coke ratio. The oxygen content has a great influence on the production. At present, because the furnace conditions exist in different stages in the blow-in process, the oxygen enrichment in the air influences the iron-making process, the existing equipment cannot analyze and control the oxygen enrichment, and the implementation of the oxygen enrichment of the blast furnace blow-in taphole is gradually explored and practiced.
On the other hand, because oxygen is added into the hot air of the blast furnace, if the oxygen outlet of the oxygen making equipment is connected to the header pipe in front of the circle of hot air inlet of the blast furnace, the distance difference between the oxygen inlet and each hot air port of the blast furnace is very large, and the situation that the oxygen is uniformly mixed and enters each inlet of the blast furnace along with the hot air is difficult to ensure; if each nozzle pipe of the circle of hot air inlet of the blast furnace is connected with an oxygen inlet, although oxygen can be uniformly mixed to enter each hot air inlet of the blast furnace, the installation and the use are troublesome, the control cost is high, and the use is inconvenient.
SUMMERY OF THE UTILITY MODEL
The utility model overcomes the defects of the prior art, provides a blast furnace taphole oxygen enrichment device, and aims to improve the accuracy of oxygen content uniformity and oxygen enrichment rate monitoring and tapping judgment in the air in the oxygen feeding process, and further improve the quality requirement of tapping.
The utility model discloses a realize through following technical scheme.
A blast furnace taphole oxygen enrichment device comprises a host system, an analysis system and an oxygen lance system, wherein the host system comprises a gas mixing bag, the gas mixing bag is connected with a compressed air inlet through an air pipeline, the gas mixing bag is connected with an oxygen inlet through an oxygen pipeline, an air flow regulating valve is arranged on the air pipeline, and an oxygen flow regulating valve is arranged on the oxygen pipeline; the gas mixing bag is connected with a gas outlet pipe; the analysis system comprises an oxygen analyzer, a sampling device and a temperature measuring device, wherein the oxygen analyzer is connected with a zirconia probe through a connecting line, the zirconia probe extends into the sampling device, and the sampling device is connected with the gas mixing bag through a sampling tube; the sampling device is provided with a sampling exhaust valve; the temperature measuring device comprises a first temperature thermocouple and a second temperature thermocouple, a probe of the second temperature thermocouple is arranged in the blast furnace, and a probe of the first temperature thermocouple is arranged at a furnace mouth of the blast furnace; the oxygen lance system comprises an oxygen lance head and an air inlet pipe which are arranged in a blast furnace mouth, one end of the air inlet pipe is connected with the oxygen lance head through a quick joint, and the other end of the air inlet pipe is connected with the air outlet pipe.
Further preferably, the air pipeline is provided with an air pressure regulating valve and an air pressure gauge.
Further preferably, the oxygen pipeline is provided with an oxygen pressure regulating valve and an oxygen pressure gauge.
Further preferably, the sampling pipe is provided with a sampling flow control valve.
Further preferably, the gas mixing bag is provided with a gas bag pressure gauge.
Further preferably, the air outlet pipe is provided with an air outlet pressure regulating valve.
Further preferably, the first temperature thermocouple and the second temperature thermocouple are respectively connected to a thermocouple temperature display instrument.
Preferably, the air inlet pipe is provided with a branch pipe, the branch pipe is connected with the air outlet pipe, the branch pipe is provided with an air inlet valve, one end of the air inlet pipe, which is far away from the oxygen gun head, is connected with an observation mirror, and the joint of the observation mirror and the air inlet pipe is provided with an observation mirror valve.
The utility model discloses produced beneficial effect does for prior art.
1) The system uses the gas mixing bag to fully and uniformly mix oxygen and air before gas is fed, and then the oxygen and the air are fed into the oxygen lance, so that the uniformity of oxygen contained in the gas fed into the blast furnace is effectively improved.
2) The analytic system that this system set up, through leading out the great gas mixture package of pressure entering the sampling device of ordinary pressure with the gas mixture in advance, can effectively avoid the high pressure to the destruction of the zirconia probe that oxygen analysis appearance is connected, set up discharge valve on sampling device, make the gas mixture that gets into in the sampling device pass through the zirconia probe with the mode that flows always, survey the gaseous oxygen content that gas mixture package got into oxygen rifle system in real time, can effectively improve the real-time and the rate of accuracy of survey, the problem that past oxygen content was judged unable to be detected by experience has been solved, cooperation control valve, can adjust the air input according to the in-furnace iron's the production conditions, keep the best oxygen-enriched volume all the time.
3) The system can determine the height of molten iron by measuring the temperature through the temperature measuring device, so as to accurately judge the time for tapping the molten iron, and when the molten iron reaches the tapping condition, the oxygen gun head and the air inlet pipe can be quickly disconnected through the quick connector, so that the host system is effectively protected.
The system effectively improves the accurate oxygen supply and adjustment of the oxygen enrichment of the whole blast furnace taphole, ensures that the molten iron keeps normal oxygen demand in the production process, and meanwhile, the temperature measuring device effectively judges the tapping of the molten iron, so that the production accuracy is further improved, and the product quality is further improved.
Drawings
FIG. 1 is a schematic structural diagram of a blast furnace taphole oxygen enrichment system according to an embodiment of the present invention.
In the figure, 1 is a compressed air inlet, 2 is an oxygen inlet, 3 is an air pipeline, 4 is an oxygen pipeline, 5 is an air pressure regulating valve, 6 is an oxygen pressure regulating valve, 7 is an air pressure gauge, 8 is an oxygen pressure gauge, 9 is an air flow regulating valve, 10 is an oxygen flow regulating valve, 11 is a mixed gas bag, 12 is an air bag pressure gauge, 13 is an outlet gas pressure regulating valve, 14 is an outlet gas pipe, 15 is a sampling pipe, 16 is a sampling flow control valve, 17 is a sampling device, 18 is a sampling exhaust valve, 19 is a zirconia probe, 20 is a connecting line, 21 is an oxygen analyzer, 22 is a first temperature thermocouple, 23 is a second temperature thermocouple, 24 is an oxygen gun head, 25 is an inlet gas pipe, 26 is an observation mirror valve, 27 is an observation mirror, 28 is an inlet gas valve, 29 is a quick connector, 30 is a blast furnace, 31 is a branch pipe, and 32 is a thermocouple temperature display.
Detailed Description
In order to make the technical problem, technical scheme and beneficial effect that the utility model will solve more clearly understand, combine embodiment and attached drawing, it is right to go on further detailed description the utility model discloses. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solution of the present invention is described in detail below with reference to the embodiments and the drawings, but the scope of protection is not limited thereto.
As shown in figure 1, the oxygen enrichment device for the blast furnace taphole is independently installed, oxygen-enriched mixed gas is provided for tapping molten iron of a blast furnace, the aerobic condition in the blast furnace is monitored in real time, and the tapping time of the molten iron is judged at the same time, the system comprises a host system, an analysis system and an oxygen lance system, the host system comprises a gas mixing bag 11, the gas mixing bag 11 is connected with a compressed air inlet 1 through an air pipeline 3, meanwhile, the gas mixing bag 11 is connected with an oxygen inlet 2 through an oxygen pipeline 4, and an air flow regulating valve 9, an air pressure regulating valve 5 and an air pressure gauge 7 are arranged on the air pipeline 3; the oxygen pipeline 4 is provided with an oxygen flow regulating valve 10, an oxygen pressure regulating valve 6 and an oxygen pressure gauge 8; an air outlet pipe 14 is connected to the air mixing bag 11, an air outlet pressure regulating valve 13 is arranged on the air outlet pipe 14, and an air bag pressure gauge 12 is arranged on the air mixing bag 11.
The analysis system comprises an oxygen analyzer 21, a sampling device 17 and a temperature measuring device, wherein the sampling device 17 can be any container capable of containing mixed gas and can be made of glass or other high-temperature-resistant and oxidation-resistant materials, the oxygen analyzer 21 is connected with an external zirconia probe 19 through a connecting line 20, the zirconia probe 19 extends into the sampling device 17, and the sampling device 17 is connected with a mixed gas bag 11 through a sampling tube 15 and is used for enabling the mixed gas to enter the sampling device 17 through the sampling tube 15; the sampling pipe 15 is provided with a sampling flow control valve 16, the lower end of the sampling device 17 is provided with a sampling exhaust valve 18, so that the mixed gas entering the sampling device 17 is flowing gas, when sampling, the sampling flow control valve 16 is in a small flow state, the sampling exhaust valve 18 is normally open, the mixed gas continuously flows through the zirconia probe 19, the oxygen content in the flowing mixed gas is monitored in real time, and the oxygen content in the gas entering the blast furnace can be known at the same time. The pressure in the air bag is controlled by adjusting an air outlet pressure adjusting valve 13 according to the oxygen content, and the oxygen content of the air in the air mixing bag 11 is adjusted by an air flow adjusting valve 9 and an oxygen flow adjusting valve 10; because the environmental pressure monitored by the zirconia probe 19 generally can not exceed 50Kpa, if the pressure is too high, the zirconia probe 19 can be damaged, so the system can effectively avoid the damage of the zirconia probe 19 connected with the oxygen analyzer 21 by leading the mixed gas out of the mixed gas bag 11 with higher pressure in advance and then entering the sampling device 17 with normal pressure.
The temperature measuring device comprises a first temperature thermocouple 22 and a second temperature thermocouple 23, and the first temperature thermocouple 22 and the second temperature thermocouple 23 are respectively connected to a thermocouple temperature display instrument 32 and used for monitoring the temperature in the furnace. The probe of the second temperature thermocouple 23 is arranged in the blast furnace 30, and the probe of the first temperature thermocouple 22 is arranged at the furnace mouth of the blast furnace 30; the oxygen lance system comprises an oxygen lance head 24 and an air inlet pipe 25 which are arranged in a blast furnace 30, wherein the first temperature thermocouple 22 and the second temperature thermocouple 23 can be respectively and fixedly bound at the upper part and the lower part of the oxygen lance head 24 and enter the blast furnace along with the oxygen lance head 24, the second temperature thermocouple 23 arranged on the oxygen lance head 24 is positioned at the lower part of the first temperature thermocouple 22, the height of the molten iron level in the furnace is judged through the second temperature thermocouple 23, and the tapping time of the molten iron is judged through the first temperature thermocouple 22. One end of the air inlet pipe 25 is connected with the oxygen lance head 24 through a quick coupling 29, the air inlet pipe 25 is provided with a branch pipe 31, the branch pipe 31 is connected with the air outlet pipe 14, an air inlet valve 28 is arranged on the branch pipe 31, one end of the air inlet pipe 25, which is far away from the oxygen lance head 24, is connected with an observation mirror 27, and an observation mirror valve 26 is arranged at the connection part of the observation mirror 27 and the air inlet pipe 25.
When the iron liquid level reaches the height of the iron notch, the second temperature thermocouple 23 measures the high temperature and rapidly rises, when the temperature rises to 1000 ℃, the second temperature thermocouple 23 can be damaged, at the moment, the iron liquid level in the furnace hearth reaches the height of the second temperature thermocouple 23, the oxygen enrichment of the oxygen lance can be controlled according to the furnace condition, at the moment, the temperature of the first temperature thermocouple 22 is continuously raised, the depth of the iron notch and the first tapping time are judged through the change of the temperature, when the first temperature thermocouple 22 is damaged, the temperature reaches a certain value and the iron can be tapped, at the moment, the air inlet pipe 25 is rapidly separated from the oxygen lance head 24 through the quick connector 29, at the moment, the iron liquid flows out along the oxygen lance head 24, and the purpose of smoothly tapping is achieved.
In the system, the oxygen and the air are fully and uniformly mixed by using the air mixing bag 11 before air inlet, and then the oxygen and the air are sent into the oxygen gun head 24, so that the uniformity of oxygen contained in the gas entering the blast furnace 30 is effectively improved. The analysis system set by the system can effectively avoid the damage of high pressure to a zirconium oxide probe 19 connected with an oxygen analyzer 21 by leading mixed gas out of a mixed gas bag 11 with larger pressure in advance to enter a sampling device 17 with normal pressure, a sampling exhaust valve 18 is arranged on the sampling device 17, and a sampling flow control valve 16 is arranged at an inlet, so that the mixed gas entering the sampling device 17 always passes through the zirconium oxide probe 19 in a flowing mode, the oxygen content of the gas entering an oxygen lance system from the mixed gas bag 11 is measured in real time, the real-time performance and the accuracy of measurement can be effectively improved, the problem that the past oxygen content cannot be detected by experience judgment is solved, and the system can adjust the air inflow according to the production condition of iron in a furnace by matching with control valves at various positions, and always keep the optimal oxygen-enriched amount.
The temperature measuring device of the system can measure the temperature to judge the height of the molten iron so as to accurately judge the time for tapping the molten iron, and when the molten iron reaches the tapping condition, the oxygen gun head 24 and the air inlet pipe 25 can be quickly disconnected through the quick connector 29, so that the host system is effectively protected.
The system effectively improves the accurate oxygen supply and adjustment of the oxygen enrichment of the whole blast furnace taphole, ensures that the molten iron keeps normal oxygen demand in the production process, and meanwhile, the temperature measuring device effectively judges the tapping of the molten iron, so that the production accuracy is further improved, and the product quality is further improved.
The above description is for further details of the present invention with reference to specific preferred embodiments, and it should not be understood that the embodiments of the present invention are limited thereto, and it will be apparent to those skilled in the art that the present invention can be implemented in a plurality of simple deductions or substitutions without departing from the scope of the present invention, and all such alterations and substitutions should be considered as belonging to the present invention, which is defined by the appended claims.
Claims (8)
1. The blast furnace taphole oxygen enrichment device is characterized by comprising a host system, an analysis system and an oxygen lance system, wherein the host system comprises a gas mixing bag (11), the gas mixing bag (11) is connected with a compressed air inlet (1) through an air pipeline (3), the gas mixing bag (11) is connected with an oxygen inlet (2) through an oxygen pipeline (4), the air pipeline (3) is provided with an air flow regulating valve (9), and the oxygen pipeline (4) is provided with an oxygen flow regulating valve (10); the air mixing bag (11) is connected with an air outlet pipe (14); the analysis system comprises an oxygen analyzer (21), a sampling device (17) and a temperature measuring device, wherein the oxygen analyzer (21) is connected with a zirconia probe (19) through a connecting line (20), the zirconia probe (19) extends into the sampling device (17), and the sampling device (17) is connected with the gas mixing bag (11) through a sampling pipe (15); the sampling device (17) is provided with a sampling exhaust valve (18); the temperature measuring device comprises a first temperature thermocouple (22) and a second temperature thermocouple (23), a probe of the second temperature thermocouple (23) is arranged in the blast furnace (30), and a probe of the first temperature thermocouple (22) is arranged at the mouth of the blast furnace (30); the oxygen lance system comprises an oxygen lance head (24) and an air inlet pipe (25) which are arranged in a blast furnace mouth of a blast furnace (30), wherein one end of the air inlet pipe (25) is connected with the oxygen lance head (24) through a quick coupling (29), and the other end of the air inlet pipe (25) is connected with the air outlet pipe (14).
2. The oxygen enrichment device for the iron notch of the blast furnace as claimed in claim 1, characterized in that the air pipeline (3) is provided with an air pressure regulating valve (5) and an air pressure gauge (7).
3. The oxygen enrichment device for the blast furnace taphole according to claim 1, characterized in that the oxygen pipeline (4) is provided with an oxygen pressure regulating valve (6) and an oxygen pressure gauge (8).
4. The oxygen enrichment device for the iron notch of the blast furnace as claimed in claim 1, characterized in that the sampling pipe (15) is provided with a sampling flow control valve (16).
5. The oxygen enrichment device for the blast furnace taphole according to claim 1, characterized in that the gas mixing bag (11) is provided with a gas bag pressure gauge (12).
6. The oxygen enrichment device for the taphole of the blast furnace according to claim 1, wherein the outlet pipe (14) is provided with an outlet pressure regulating valve (13).
7. The oxygen enrichment device for the iron notch of the blast furnace according to claim 1, wherein the air inlet pipe (25) is provided with a branch pipe (31), the branch pipe (31) is connected with the air outlet pipe (14), an air inlet valve (28) is arranged on the branch pipe (31), one end of the air inlet pipe (25) far away from the oxygen gun head (24) is connected with an observation mirror (27), and an observation mirror valve (26) is arranged at the connection part of the observation mirror (27) and the air inlet pipe (25).
8. The oxygen enrichment device for the blast furnace taphole according to claim 1, characterized in that the first temperature thermocouple (22) and the second temperature thermocouple (23) are connected with a thermocouple temperature display instrument.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921255185.5U CN210420008U (en) | 2019-08-05 | 2019-08-05 | Blast furnace iron notch oxygen enrichment device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921255185.5U CN210420008U (en) | 2019-08-05 | 2019-08-05 | Blast furnace iron notch oxygen enrichment device |
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| CN210420008U true CN210420008U (en) | 2020-04-28 |
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| CN201921255185.5U Active CN210420008U (en) | 2019-08-05 | 2019-08-05 | Blast furnace iron notch oxygen enrichment device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111914203A (en) * | 2020-04-30 | 2020-11-10 | 武钢集团昆明钢铁股份有限公司 | Calculation method of first tapping time and blast furnace blowing-in method |
| CN113584248A (en) * | 2021-08-25 | 2021-11-02 | 新疆八一钢铁股份有限公司 | Iron notch oxygen lance system for Europe smelting furnace |
-
2019
- 2019-08-05 CN CN201921255185.5U patent/CN210420008U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111914203A (en) * | 2020-04-30 | 2020-11-10 | 武钢集团昆明钢铁股份有限公司 | Calculation method of first tapping time and blast furnace blowing-in method |
| CN111914203B (en) * | 2020-04-30 | 2023-06-09 | 武钢集团昆明钢铁股份有限公司 | Calculation method of first tapping time and blast furnace opening method |
| CN113584248A (en) * | 2021-08-25 | 2021-11-02 | 新疆八一钢铁股份有限公司 | Iron notch oxygen lance system for Europe smelting furnace |
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