CN110645475A - Blast furnace oxygen conveying system and working method - Google Patents
Blast furnace oxygen conveying system and working method Download PDFInfo
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- CN110645475A CN110645475A CN201910898151.6A CN201910898151A CN110645475A CN 110645475 A CN110645475 A CN 110645475A CN 201910898151 A CN201910898151 A CN 201910898151A CN 110645475 A CN110645475 A CN 110645475A
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- oxygen
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- stop valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/18—Arrangements for supervising or controlling working operations for measuring the quantity of conveyed product
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacture Of Iron (AREA)
Abstract
The invention discloses a blast furnace oxygen conveying system and a working method. The system comprises a first oxygen delivery system, a second oxygen delivery system and a delivery main pipe; the first oxygen delivery system comprises a first delivery pipe, a first flame arrester, a first stop valve, a first pressure gauge, a first pressure reducing regulating valve, a second pressure gauge, a second stop valve and a third stop valve; the second oxygen delivery system comprises a second delivery pipe, a second flame arrester, a fourth stop valve, a third pressure gauge, a filter, a second pressure reducing adjusting valve, a fourth pressure gauge, a third pressure reducing adjusting valve, a fifth pressure gauge and a fifth stop valve. The system can realize layered control of medium-pressure oxygen and low-pressure oxygen, ensure that low-pressure oxygen with low energy consumption is used firstly, and the insufficient part is supplemented by the medium-pressure oxygen, effectively avoid the problems of low-pressure oxygen diffusion and energy waste caused by the large use of medium-pressure oxygen, and furthest realize oxygen enrichment, energy saving and consumption reduction of the blast furnace.
Description
Technical Field
The invention belongs to the field of oxygen enrichment of metallurgical blast furnaces, and particularly relates to a blast furnace oxygen conveying system and a working method.
Background
At present, part of blast furnaces use medium-pressure oxygen (3.0MPa), the medium-pressure oxygen is throttled and decompressed and then is sent into the blast furnace for oxygen enrichment smelting, energy is greatly wasted in the throttling process, and a large amount of noise is generated to bring the problem of environmental protection.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides a blast furnace oxygen conveying system, aiming at solving the problem of oxygen waste of the existing blast furnace. The invention also provides a working method of the blast furnace oxygen delivery system.
The technical scheme is as follows: the invention relates to a blast furnace oxygen delivery system, which comprises a first oxygen delivery system, a second oxygen delivery system and a delivery main pipe;
the first oxygen conveying system comprises a first conveying pipe, and a first flame arrester, a first stop valve, a first pressure gauge, a first pressure reducing regulating valve, a second pressure gauge, a second stop valve and a third stop valve are sequentially arranged on the first conveying pipe;
the air inlet of the first conveying pipe is communicated with the outlet of the first oxygen storage system, and the air outlet of the first conveying pipe is communicated with the air inlet pipe of the conveying main pipe;
the second oxygen conveying system comprises a second conveying pipe, and a second flame arrester, a fourth stop valve, a third pressure gauge, a filter, a second pressure reducing regulating valve, a fourth pressure gauge, a third pressure reducing regulating valve, a fifth pressure gauge and a fifth stop valve are sequentially arranged on the second conveying pipe;
the air inlet of the second conveying pipe is communicated with the outlet of the second oxygen storage system, and the air outlet of the second conveying pipe is communicated with the air inlet pipe of the conveying main pipe.
And a first relief valve is arranged between the first stop valve and the first pressure gauge.
And a second relief valve is arranged between the fourth stop valve and the third pressure gauge.
And a third bleeding valve is arranged at the air outlet of the conveying main pipe.
And a sixth stop valve is arranged at the air outlet of the conveying main pipe.
A bypass system is arranged between the fourth pressure gauge and the third pressure reducing regulating valve, the bypass system comprises a bypass conveying pipe communicated with the second conveying pipe, and a seventh stop valve is arranged on the bypass conveying pipe.
And the first oxygen storage system communicated with the air inlet of the first conveying pipe is an oxygen system for conveying low pressure.
And the second oxygen storage system communicated with the air inlet of the second conveying pipe is an oxygen system for conveying medium pressure.
The working method of the blast furnace oxygen conveying system comprises the following steps:
(1) the oxygen demand of the blast furnace is taken as an adjusting target, and the actual oxygen enrichment of the blast furnace is measured by using a blast furnace oxygen enrichment oxygen flowmeter;
(2) opening a stop valve of the first oxygen delivery system to perform a flow regulating valve, and not opening a large low-pressure oxygen regulating valve when the actual oxygen amount reaches the required amount;
(3) if the actual oxygen flow rate does not reach the target demand when the opening degree of the stop valve in the first oxygen delivery system is 100%, opening the second oxygen delivery system, and adjusting the oxygen delivery flow rate of the second oxygen delivery system by using the stop valve in the second oxygen delivery system to meet the aerobic requirement of the blast furnace;
(4) when the second oxygen conveying system works, a stop valve arranged on the bypass system can be opened, and oxygen can be supplied to the front of the furnace at the same time.
The working method of the blast furnace oxygen conveying system is preferably as follows:
when the oxygen demand of the blast furnace is less than or equal to 0.8MPa, opening the first oxygen conveying system, closing the second oxygen conveying system 20, regulating the flow of oxygen with the pressure of 0.8MPa entering from the first oxygen storage system through the first stop valve, regulating the pressure of oxygen entering the first pressure reduction regulating valve 105 to be 0.7MPa, reducing the pressure of the oxygen from 0.7MPa to 0.6MPa through the first pressure reduction regulating valve 105, and further regulating the oxygen amount entering the blast furnace through the second stop valve and the third stop valve;
when the oxygen demand of the blast furnace is more than 0.8MPa, opening the opening of a stop valve of the first oxygen delivery system to 100 percent, simultaneously opening the second oxygen delivery system, reducing the pressure of the oxygen fed from the second oxygen storage system to 2.2MPa, regulating the flow through a fourth stop valve, reducing the pressure of the oxygen from 2.2MPa to 1.2MPa through a second pressure reduction regulating valve, reducing the pressure of the oxygen from 1.2MPa to 0.6MPa through a third pressure reduction regulating valve, and regulating the flow of the oxygen through a fifth stop valve;
when the second oxygen storage system is opened, the bypass system is opened simultaneously, and oxygen supply in front of the furnace is realized.
Has the advantages that: (1) the first oxygen delivery system for delivering low-pressure oxygen is established, and the stop valve is arranged on the first oxygen delivery system and used for adjusting the flow of oxygen entering the blast furnace, so that the oxygen pipeline for supplying oxygen by low oxygen is ensured to be used in advance, and the oxygen compression energy consumption is saved; (2) in order to ensure the oxygen enrichment stability of the blast furnace, the secondary oxygen conveying system is arranged for conveying medium-pressure oxygen, so that the medium-pressure oxygen and the low-pressure oxygen are controlled in a layered mode, the low-pressure oxygen with low energy consumption is ensured to be used firstly, the insufficient part is supplemented by the medium-pressure oxygen, the problems that the low-pressure oxygen is diffused, the medium-pressure oxygen is used in large quantity and energy is wasted are effectively avoided, and the oxygen enrichment, energy conservation and consumption reduction of the blast furnace are realized to the maximum.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
Example 1: as shown in fig. 1, the blast furnace oxygen delivery system of the present invention comprises a first oxygen delivery system 10, a second oxygen delivery system 20, and a delivery main 30;
in the embodiment, the first oxygen storage system communicated with the gas inlet of the first delivery pipe 101 is an oxygen system for delivering low pressure, the first oxygen storage system is a 0.8MPa low-pressure oxygen compressor, the first oxygen delivery system 10 comprises the first delivery pipe 101, the gas inlet of the first delivery pipe 101 is communicated with the outlet of the first oxygen storage system, the gas outlet of the first delivery pipe 101 is communicated with the gas inlet pipe of the delivery main pipe 30, the first delivery pipe 101 is sequentially provided with a first flame arrester 102, a first stop valve 103, a first pressure gauge 104, a first pressure reducing regulating valve 105, a second pressure gauge 106, a second stop valve 107 and a third stop valve 108, in order to prevent the gas pressure from increasing rapidly and causing potential safety hazards, a first relief valve 109 is arranged between the first stop valve 103 and the first pressure gauge 104, when the pressure in the first oxygen delivery system is greater than the maximum bearing pressure of the first relief valve, the first bleed valve 109 opens, releasing the gas.
In a particular application, the amount of oxygen delivered to the blast furnace by the first oxygen delivery system 10 is adjusted based on the oxygen demand of the blast furnace 50. When the oxygen demand of the blast furnace 50 is less than 0.8MPa, the oxygen fed from the low-pressure oxygen compressor of 0.8MPa adjusts the oxygen flow through the first stop valve 103, the pressure of the oxygen gas can be reduced from 0.7MPa to 0.6MPa by the first pressure-reducing regulator valve 105, in the case where the pressure of oxygen gas entering the first pressure reducing regulator valve 105 is measured by the first pressure gauge 104 and the pressure of oxygen gas after pressure reduction by the first pressure reducing regulator valve 105 is detected by the second pressure gauge 106, the pressure of oxygen gas sent out in the first delivery pipe 101 is accurately controlled, and in addition, a second cut-off valve 107 and a third cut-off valve 108 are provided after the first pressure reducing regulator valve 105, the flow of oxygen in the first transport pipe 101 may be further controlled, oxygen from the first oxygen delivery system 10 entering the main transport pipe 30, when the first oxygen delivery system 10 is opened to the maximum and the requirement of the blast furnace on oxygen demand still cannot be met, the second oxygen delivery system 20 is opened;
the second oxygen delivery system 20 includes a second delivery pipe 201, the second oxygen storage system communicated with the air inlet of the second delivery pipe 201 is a system for delivering medium-pressure oxygen, the second oxygen storage system is a medium-pressure oxygen compressor, and in order to further reduce energy consumption, since the first oxygen delivery system 10 can provide 0.8MPa oxygen flow, the second oxygen storage system in the embodiment adjusts the 3MPa medium-pressure oxygen compressor in the prior art to 2.2MPa medium-pressure oxygen compressor, so as to reduce energy consumption of the whole second oxygen delivery system 20 caused by adjusting the pressure of oxygen fed into the blast furnace.
The air inlet of the second conveying pipe 201 is communicated with the outlet of the second oxygen storage system, the air outlet of the second conveying pipe 201 is communicated with the air inlet pipe of the conveying main pipe 30, a second flame arrester 202, a fourth stop valve 203, a third pressure gauge 204, a filter 205, a second pressure reducing regulating valve 206, a fourth pressure gauge 207, a third pressure reducing regulating valve 208, a fifth pressure gauge 209 and a fifth stop valve 210 are sequentially arranged on the second conveying pipe 201, similarly, in order to prevent potential safety hazards caused by sharp increase of gas pressure, a second relief valve 211 is arranged between the fourth stop valve 203 and the third pressure gauge 204, and when the pressure in the second oxygen conveying system is larger than the maximum bearing pressure of the second relief valve, the second relief valve is opened to release gas.
When the oxygen quantity delivered by the first oxygen delivery system cannot meet the oxygen demand for the blast furnace, opening the oxygen delivered from the 3MPa medium-pressure oxygen compressor and adjusting the oxygen flow through a fourth stop valve 203, wherein a second delivery pipe 201 is provided with two-stage pressure reducing valves which are a second pressure reducing adjusting valve 206 and a third pressure reducing valve 208 respectively;
in a specific application example, the second pressure reducing regulating valve 206 may reduce the pressure of the oxygen from 2.2MPa to 1.2MPa, and the oxygen pressure entering the second pressure reducing regulating valve 206 is detected by the third pressure gauge 204 and the oxygen pressure after being reduced by the second pressure reducing regulating valve 206 is detected by the fourth pressure gauge 207;
in a specific application example, the third pressure reducing regulating valve 208 may reduce the pressure of the oxygen gas reduced by the second pressure reducing regulating valve 206 from 1.2MPa to 0.6MPa, the oxygen gas sent from the third pressure reducing regulating valve 208 is detected by a fifth pressure gauge 209, and the fifth shutoff valve 210 may further control the flow rate of the oxygen gas sent from the second delivery pipe 201.
The gas inlet of the main delivery pipe 30 of the present invention is connected to the gas outlet of the first oxygen delivery system 10 and the gas outlet of the second oxygen delivery system 20, respectively, and the gas outlet of the main delivery pipe 30 is connected to the gas inlet of the blast furnace 50, and similarly, in order to eliminate the safety hazard, a third relief valve 301 is provided at the gas outlet of the main delivery pipe 30, and a sixth stop valve 302 is provided at the gas outlet of the main delivery pipe 30 in order to further control the amount of oxygen to be fed into the blast furnace 50.
Because the second oxygen conveying system 20 is sent into the blast furnace for oxygen-enriched smelting after throttling and pressure reduction, and a large amount of energy is wasted in the throttling process, the bypass system 40 is arranged between the fourth pressure gauge 207 and the third pressure reduction regulating valve 208, the bypass system 40 comprises a bypass conveying pipe 401 communicated with the second conveying pipe 201, a seventh stop valve 402 is arranged on the bypass conveying pipe 401, partial oxygen is led out through the bypass system 40 to be used for oxygen in front of the furnace, the energy consumption of throttling and pressure reduction of the second oxygen conveying system is reduced, and oxygen supply in front of the furnace is realized at the same time. The partial oxygen port is led through the bypass 40, reducing the pressure reducing pressure of the third pressure reducing regulator valve 208 and the throttle pressure of the shutoff valve located after the third regulator valve 208.
The working method of the blast furnace oxygen delivery system in the embodiment comprises the following steps:
(1) the oxygen demand of the blast furnace is taken as an adjusting target, and the actual oxygen enrichment of the blast furnace is measured by using a blast furnace oxygen enrichment oxygen flowmeter;
(2) firstly opening a stop valve of a first oxygen delivery system to perform a flow regulating valve, and when the actual oxygen amount reaches the required amount, not opening a large low-pressure oxygen regulating valve, wherein the large low-pressure oxygen regulating valve comprises a first stop valve 103, a second stop valve 107 and a third stop valve 108;
(3) when the opening degree of the stop valve in the first oxygen delivery system is 100%, the actual oxygen flow rate does not reach the oxygen demand of the blast furnace, the second oxygen delivery system is opened, and the stop valve in the second oxygen delivery system (comprising a fourth stop valve 203 and a fifth stop valve 210) is used for adjusting the oxygen delivery flow rate of the second oxygen delivery system to meet the aerobic requirement of the blast furnace;
(4) while the second oxygen supply system is operating, a stop valve (seventh stop valve 402) provided in the bypass system can be opened to supply oxygen in front of the furnace.
Application example: reform transform original oxygen conveying system, newly-built first oxygen conveying system is as low pressure oxygen conveying pipeline, including DN400 oxygen pipeline, low pressure oxygen flow control valve (stop valve), the manometer, the thermometer, relief valve (diffuse valve), carry out system transformation to original equipment and pipeline and control mode simultaneously, reform transform original 3.0MPa middling pressure oxygen system into middling pressure oxygen and low pressure oxygen and realize the system of layered control, mainly carry out the oxygen boosting for the blast furnace through low pressure oxygen, ensure to use the low pressure oxygen of energy consumption earlier, insufficient part is with middling pressure oxygen supplyes, low pressure oxygen has effectively been avoided diffusing, middling pressure oxygen uses the extravagant problem of energy in a large number, furthest realizes blast furnace oxygen boosting energy saving and consumption reduction. The applicant saves the cost annually after using the new method: 0.08 × 6 × 24 × 365 ═ 4204.8 ten thousand yuan.
Claims (10)
1. A blast furnace oxygen delivery system is characterized by comprising a first oxygen delivery system (10), a second oxygen delivery system (20) and a delivery main pipe (30);
the first oxygen conveying system (10) comprises a first conveying pipe (101), and a first flame arrester (102), a first stop valve (103), a first pressure gauge (104), a first pressure reducing regulating valve (105), a second pressure gauge (106), a second stop valve (107) and a third stop valve (108) are sequentially arranged on the first conveying pipe (101);
the air inlet of the first conveying pipe (101) is communicated with the outlet of the first oxygen storage system, and the air outlet of the first conveying pipe (101) is communicated with the air inlet pipe of the conveying main pipe (30);
the second oxygen conveying system (20) comprises a second conveying pipe (201), and a second flame arrester (202), a fourth stop valve (203), a third pressure gauge (204), a filter (205), a second pressure reducing regulating valve (206), a fourth pressure gauge (207), a third pressure reducing regulating valve (208), a fifth pressure gauge (209) and a fifth stop valve (210) are sequentially arranged on the second conveying pipe (201);
the air inlet of the second conveying pipe (201) is communicated with the outlet of the second oxygen storage system, and the air outlet of the second conveying pipe (201) is communicated with the air inlet pipe of the conveying main pipe (30).
2. The blast furnace oxygen delivery system of claim 1, wherein a first bleed valve (109) is provided between the first shut-off valve (103) and the first pressure gauge (104).
3. The blast furnace oxygen delivery system according to claim 1, wherein a second bleed valve (211) is provided between the fourth shut-off valve (203) and the third pressure gauge (204).
4. Blast furnace oxygen delivery system according to claim 1, characterised in that the outlet of the delivery main (30) is provided with a third bleed valve (301).
5. The blast furnace oxygen delivery system according to claim 1, wherein the outlet of the delivery main (30) is provided with a sixth shut-off valve (302).
6. The blast furnace oxygen delivery system according to claim 1, wherein a bypass system (40) is arranged between the fourth pressure gauge (207) and the third pressure reducing regulating valve (208), the bypass system (40) comprises a bypass delivery pipe (401) communicated with the second delivery pipe (201), and a seventh stop valve (402) is arranged on the bypass delivery pipe (401).
7. The blast furnace oxygen delivery system of claim 1, wherein the first oxygen storage system in communication with the inlet of the first delivery pipe (101) is an oxygen system delivering low pressure.
8. The blast furnace oxygen delivery system of claim 1, wherein the second oxygen storage system in communication with the inlet of the second delivery pipe (201) is a system delivering medium pressure oxygen.
9. A method of operating a blast furnace oxygen delivery system as claimed in any one of claims 1 to 8, comprising the steps of:
(1) the oxygen demand of the blast furnace is taken as an adjusting target, and the actual oxygen enrichment of the blast furnace is measured by using a blast furnace oxygen enrichment oxygen flowmeter;
(2) opening a stop valve of the first oxygen delivery system to perform a flow regulating valve, and not opening a large low-pressure oxygen regulating valve when the actual oxygen amount reaches the required amount;
(3) when the opening degree of a stop valve in the first oxygen delivery system is 100%, the actual oxygen flow rate does not reach the oxygen demand of the blast furnace, the second oxygen delivery system is opened, and the stop valve in the second oxygen delivery system is used for adjusting the oxygen delivery flow rate of the second oxygen delivery system to meet the oxygen demand of the blast furnace;
(4) when the second oxygen conveying system works, a stop valve arranged on the bypass system can be opened, and oxygen can be supplied to the front of the furnace at the same time.
10. The method of operating a blast furnace oxygen delivery system of claim 9, comprising the steps of:
when the oxygen demand of the blast furnace is less than or equal to 0.8MPa, opening the first oxygen conveying system, closing the second oxygen conveying system 20, regulating the flow of oxygen with the pressure of 0.8MPa entering from the first oxygen storage system through the first stop valve, regulating the pressure of oxygen entering the first pressure reduction regulating valve 105 to be 0.7MPa, reducing the pressure of the oxygen from 0.7MPa to 0.6MPa through the first pressure reduction regulating valve 105, and further regulating the oxygen amount entering the blast furnace through the second stop valve and the third stop valve;
when the oxygen demand of the blast furnace is more than 0.8MPa, opening the opening of a stop valve of the first oxygen delivery system to 100 percent, simultaneously opening the second oxygen delivery system, reducing the pressure of the oxygen fed from the second oxygen storage system to 2.2MPa, regulating the flow through a fourth stop valve, reducing the pressure of the oxygen from 2.2MPa to 1.2MPa through a second pressure reduction regulating valve, reducing the pressure of the oxygen from 1.2MPa to 0.6MPa through a third pressure reduction regulating valve, and regulating the flow of the oxygen through a fifth stop valve;
when the second oxygen storage system is opened, the bypass system is opened simultaneously, and oxygen supply in front of the furnace is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910898151.6A CN110645475A (en) | 2019-09-23 | 2019-09-23 | Blast furnace oxygen conveying system and working method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910898151.6A CN110645475A (en) | 2019-09-23 | 2019-09-23 | Blast furnace oxygen conveying system and working method |
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| CN110645475A true CN110645475A (en) | 2020-01-03 |
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| CN201910898151.6A Pending CN110645475A (en) | 2019-09-23 | 2019-09-23 | Blast furnace oxygen conveying system and working method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113639200A (en) * | 2021-08-16 | 2021-11-12 | 南京钢铁股份有限公司 | Pipeline system and method for merging high-pressure oxygen of chemical plant into medium-pressure oxygen pipe network of iron and steel plant |
-
2019
- 2019-09-23 CN CN201910898151.6A patent/CN110645475A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113639200A (en) * | 2021-08-16 | 2021-11-12 | 南京钢铁股份有限公司 | Pipeline system and method for merging high-pressure oxygen of chemical plant into medium-pressure oxygen pipe network of iron and steel plant |
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