CN110699507B - European smelting furnace gas circulation back-matching device - Google Patents
European smelting furnace gas circulation back-matching device Download PDFInfo
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- CN110699507B CN110699507B CN201911082464.0A CN201911082464A CN110699507B CN 110699507 B CN110699507 B CN 110699507B CN 201911082464 A CN201911082464 A CN 201911082464A CN 110699507 B CN110699507 B CN 110699507B
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- Prior art keywords
- gas
- european
- compressor
- smelting furnace
- cooling tower
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- 238000003723 Smelting Methods 0.000 title claims abstract description 44
- 238000001816 cooling Methods 0.000 claims abstract description 24
- 230000001105 regulatory effect Effects 0.000 claims abstract description 11
- 238000011084 recovery Methods 0.000 claims abstract description 6
- 241001062472 Stokellia anisodon Species 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 229910052742 iron Inorganic materials 0.000 abstract description 6
- 238000010248 power generation Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 54
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 14
- 239000003034 coal gas Substances 0.000 description 9
- 238000002485 combustion reaction Methods 0.000 description 8
- 229910052757 nitrogen Inorganic materials 0.000 description 7
- 238000002309 gasification Methods 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000000571 coke Substances 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0073—Selection or treatment of the reducing gases
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Blast Furnaces (AREA)
Abstract
The invention discloses a gas circulation back-matching device of an European smelting furnace, which comprises a blast furnace gas residual pressure turbine power generation device TRT, a compressor, a cooling tower and an anti-surge valve, wherein the turbine power generation device TRT and a pressure regulating four-valve group are connected in parallel and connected with a gas output pipe of the European smelting furnace, the TRT and the gas outlet end of the pressure regulating four-valve group are connected with a gas recovery device and the cooling tower, the gas outlet pipe of the cooling tower is connected with the compressor through a gas inlet cutting-off and diffusing valve group in sequence, and the compressor is connected with the European smelting furnace through a gas outlet cutting-off and diffusing valve group; the compressor is also connected with a return pipe provided with an anti-surge valve, the return pipe is communicated with the cooling tower, the gas outlet cutting-off and diffusing valve group is also connected with a return pipe provided with a fault return control valve, and the return pipe is also communicated with the cooling tower. The device can perfect the technology of the European smelting furnace, reduce the production cost of the European smelting furnace and improve the quality of molten iron.
Description
Technical Field
The invention relates to a circulation and back-distribution device for the gas of a European smelting furnace, which is used for realizing the purpose that part of the gas of the European smelting furnace is circulated and back-distributed into a gasification furnace of the European smelting furnace through the device.
Background
The front body of the European smelting furnace is a COREX furnace, which is the most advanced COREX in the world, and after being moved from Bao steel to eight steel and modified by a series of process technologies, the European smelting furnace has the technical characteristics of the technology, so the COREX furnace is named as the European smelting furnace. Oxygen is mainly used as combustion-supporting gas in the European smelting furnace, coke is combusted and mainly enters the gasification furnace from the tuyere by means of oxygen, reducing gas is generated after combustion and heat is generated, if pure oxygen is unilaterally used and fed into the furnace, the problems of insufficient gas quantity in the furnace, uneven heat distribution in the furnace, insufficient reduction heat of furnace burden, insufficient reduction atmosphere and the like are caused, and meanwhile, the theoretical combustion temperature in front of the tuyere is higher, molten iron silicon content is higher, coke ratio is higher, and the cost is high. Therefore, in order to solve the problems, the European smelting furnace adopts a device for adding nitrogen into the tuyere and compressed air into the tuyere so as to reduce the combustion temperature at the front end of the tuyere, reduce the breakage of the tuyere and reduce the concentration of oxygen. However, the nitrogen addition has the problems that: the consumption of nitrogen is large, special equipment and facilities are needed for preparing nitrogen, and the preparation cost is high. Problems with the pressurized compressed air: although the problem of higher theoretical combustion temperature of the tuyere is relieved, the problem cannot be thoroughly solved, and meanwhile, the reduction atmosphere of coal gas is reduced due to higher nitrogen content in compressed air, so that the fuel ratio is higher, and the reduction of smelting cost is severely restricted.
Disclosure of Invention
In order to solve the problems of high nitrogen consumption of the European smelting furnace, high theoretical combustion temperature of a tuyere, high silicon content of molten iron, easiness in breakage of the tuyere and high smelting cost, the invention provides a European smelting furnace gas circulation back-matching device which is simple to manufacture and convenient to operate, and a compressor is adopted as a power source.
The invention aims to realize that the circulating and back-matching device for the European-smelting furnace gas comprises a blast furnace gas residual pressure turbine power generation device TRT, a compressor, a cooling tower and an anti-surge valve, wherein the turbine power generation device TRT and a pressure regulating four-valve group are connected in parallel and connected with a gas output pipe of the European-smelting furnace, the gas outlet ends of the TRT and the pressure regulating four-valve group are connected with a gas recovery device and the cooling tower, a gas outlet pipe of the cooling tower is connected with the compressor through a gas inlet cutting-off and diffusing valve group in sequence, and the compressor is connected with the European-smelting furnace through a gas outlet cutting-off and diffusing valve group; the compressor is also connected with a return pipe provided with an anti-surge valve, the return pipe is communicated with the cooling tower, the gas outlet cutting-off and diffusing valve group is also connected with a return pipe provided with a fault return control valve, and the return pipe is also communicated with the cooling tower.
The top gas and the surplus gas of the European-smelting furnace are converged into a TRT and a pressure regulating four-valve set through a gas output pipeline, and after acting and depressurization, the European-smelting furnace gas needs to be cooled and pressurized and then returned to the European-smelting furnace gasification furnace because the temperature of the European-smelting furnace gas is 150-220 ℃ and the pressure is 12 kPa. The European smelting furnace gas is led into a gas recovery device after acting and depressurization of a TRT or pressure regulating four-valve group, the European smelting furnace gas is led out in front of the gas recovery device, a cooling tower and a compressor are arranged, and the function of the cooling tower are to ensure that the temperature of the gas entering the compressor is proper, so that the compressor can convey as much gas as possible. The pressure in the European smelting furnace is 0.3-0.6MPa, a compressor is arranged to pressurize the European smelting furnace with the pressure of 12kPa to 0.8 MPa, and the European smelting furnace gas is recycled to the European smelting furnace gasification furnace through the pressure difference. An anti-surge return pipe and an anti-surge valve are provided for preventing the compressor from surging, and the opening degree of the anti-surge valve is adjusted to prevent the working point of the compressor from falling into the surging area during operation. The inlet and outlet of the compressor are provided with a gas inlet compressor cutting-off and diffusing valve group and a gas outlet compressor cutting-off and diffusing valve group, which are used for reliably exiting the compressor from the production system to perform qualified gas replacement when the compressor fails. The gas flow valve is arranged in front of the inlet of the compressor, and the PID opening of the valve is regulated by the gas demand of the European smelting furnace, so that the proper gas demand of the European smelting furnace is achieved. When the production is stopped by short-term damping down of the European smelting furnace, the compressor at the moment is not provided with the opening degrees of the gas through the fault return pipe and the fault return control valve during shutdown, so that the normal operation of the compressor is maintained, and the damage to the compressor caused by frequent starting of the compressor is avoided.
The gas is compressed and then the temperature is raised to expand the volume so as to reduce the gas quantity actually delivered by the compressor (the effective volume is reduced), and the cooling tower is arranged to reduce the volume of the inlet gas (increase the effective volume) so that the compressor delivers as much gas as possible under the same time condition. The anti-surge reflux device is arranged, when the compressor works in a surge area, the flow rapidly fluctuates to generate impact of air flow, so that the compressor generates strong vibration, the noise is increased, the wind pressure continuously shakes, and the larger the capacity and the pressure head of the compressor, the larger the hazard of surge. The compressor surge generation should have the following conditions:
a) The operating point of the compressor falls within an unstable region having a hump-shaped Q-H performance curve;
b) The frequency of the entire cycle resonates with the frequency of the airflow oscillations of the system.
The unstable region of the Q-H performance curve to the left of the surge occurs in the upper right-angled portion of the Q-H performance curve. The compressor is surging when running, and the flow, full pressure and power of the compressor pulsate or pulsate to a large extent, accompanied by significant noise, sometimes even high decibels. The vibration in surge is sometimes severe, damaging the compressor and piping. The compressor cannot be operated when surge occurs. Based on the defect that the compressor is easy to surge, an anti-surge reflux device is arranged, and the working point of the compressor falls in a stable area outside a surge area when the compressor runs by adjusting an anti-surge valve.
Another innovation is the provision of a fault reflow device. When the production is stopped by short-term damping down of the European smelting furnace, in order to prevent the compressor from being damaged by frequent starting of the compressor, when the compressor does not have a stop, coal gas circularly flows through a fault backflow pipe and a fault backflow control valve, and meanwhile, after the temperature of the compressed coal gas passing through the compressor is increased, the circulation tail end of the compressed coal gas is led to the coal gas cooling device, so that the compressed coal gas is continuously cooled, the inlet coal gas temperature requirement of the compressor is met, and the normal operation of the compressor is maintained.
The carbon monoxide in the gas of the European smelting furnace is high, and the reducing atmosphere in the furnace is improved after the gas is sprayed into the gasification furnace, so that the coke saving and smooth operation of the gasification furnace are facilitated. After the European and metallurgical furnace blows coal gas, the combustion of the tuyere and the reducing atmosphere in the furnace are correspondingly changed, and the operation of the European and metallurgical furnace is correspondingly adjusted. Because the European smelting furnace has fast gas combustion and short smoke, the edge gas flow of the European smelting furnace develops, the tuyere oxidation zone is shortened, the edge load is required to be increased in production, the edge gas flow development is restrained, and the furnace wall is protected.
The invention returns 7000Nm of gas after being put into the European smelting furnace for production and has the following beneficial factors: stabilizing the operation of the European smelting furnace, increasing the blast kinetic energy of an oxygen tuyere, and improving the working condition of a hearth and the operation index of the European smelting furnace. And reducing the theoretical combustion temperature of the tuyere. Improving the quality of molten iron, reducing the Si content in the molten iron, and reducing the silicon content of the molten iron from 1.2% to 0.6%; n reduction 2 Consumption, iron ton reduction of about 20Nm, nitrogen reduction, N reduction in gas 2 The content of the gas is improved, and the iron-making cost is reduced.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a connection structure according to the present invention.
Detailed Description
The utility model provides a European and metallurgical furnace gas circulation back-arrangement device, as shown in figure 1, includes blast furnace gas residual pressure turbine unit TRT 1, compressor 10, cooling tower 5 and anti-surge valve 8, turbine unit TRT 1 links to each other with the coal gas output tube of European and metallurgical furnace 13 with a pressure regulating four valves 2 in parallel, TRT and the gas outlet end of pressure regulating four valves are connected with gas recovery unit 6 and cooling tower 5, the outlet duct of cooling tower 5 links to each other with compressor 10 through advancing gas shutoff and relief valves 7, flow valve 9 in proper order, compressor 10 links to each other with European and metallurgical furnace 13 through going out gas shutoff and relief valves 12; the compressor 10 is further connected to a return pipe 4 provided with an anti-surge valve 8, the return pipe 4 is communicated with the cooling tower 5, the gas outlet shutoff and relief valve group 12 is further connected to a return pipe 3 provided with a fault return control valve 11, and the return pipe 3 is also communicated with the cooling tower 5.
Claims (1)
1. The utility model provides a smelt stove gas circulation back-match device, includes blast furnace gas residual pressure turbine unit TRT, compressor, cooling tower and anti-surge valve, characterized by: the TRT and the pressure regulating four-valve bank are connected in parallel and connected with a gas output pipe of the European smelting furnace, the gas outlet ends of the TRT and the pressure regulating four-valve bank are connected with a gas recovery device and a cooling tower, the gas outlet pipe of the cooling tower is connected with the compressor through a gas inlet cutting and diffusing valve bank in sequence, and the compressor is connected with the European smelting furnace through a gas outlet cutting and diffusing valve bank; the compressor is also connected with a return pipe provided with an anti-surge valve, the return pipe is communicated with the cooling tower, the gas outlet cutting-off and diffusing valve group is also connected with a return pipe provided with a fault return control valve, and the return pipe is also communicated with the cooling tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911082464.0A CN110699507B (en) | 2019-11-07 | 2019-11-07 | European smelting furnace gas circulation back-matching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911082464.0A CN110699507B (en) | 2019-11-07 | 2019-11-07 | European smelting furnace gas circulation back-matching device |
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| Publication Number | Publication Date |
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| CN110699507A CN110699507A (en) | 2020-01-17 |
| CN110699507B true CN110699507B (en) | 2024-03-19 |
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| CN201911082464.0A Active CN110699507B (en) | 2019-11-07 | 2019-11-07 | European smelting furnace gas circulation back-matching device |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112011661A (en) * | 2020-08-07 | 2020-12-01 | 新疆八一钢铁股份有限公司 | Efficient nitrogen-saving method for tuyere of Ou metallurgical furnace |
| CN116200567A (en) * | 2023-02-24 | 2023-06-02 | 新疆八一钢铁股份有限公司 | High-efficiency smelting system of European smelting furnace reduction shaft furnace |
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2019
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| CN110699507A (en) | 2020-01-17 |
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