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Project Introduction
Current Situation of Blast Furnace Gas Pressure Equalization Recovery:
Current Situation of Blast Furnace Gas Pressure Equalization Recovery:
The recovered gas comes from the blast furnace gas in the furnace top charging tank, which is generated during ironmaking and is the main energy source used in steelmaking plants. However, unlike the rough gas emitted through the downcomer from the furnace interior, the gas from the charging tank is intermittently discharged, and the pressure gradually decreases during the discharge process (initially fast flow, then slow). The discharged gas undergoes heat exchange with the equalized gas and the furnace charge, resulting in a low temperature, typically ranging from 60 to 80°C, and lower gas dust concentration compared to the gas inside the furnace.
Process Overview:
The conventional recovery of blast furnace gas is upgraded to full recovery, which means after the conventional recovery process ends: using a jet absorption device, the remaining pressure gas in the charging tank is driven into the recovery device by the high-pressure clean gas/nitrogen through the jet absorption effect. When the pressure in the tank meets the upper density requirement, stop the jet absorption, close the valve of the gas recovery system, open the upper density reading device, and the original venting pipeline and venting valve remain closed throughout the process.
The blast furnace gas with equalized pressure is fully recovered and dedusted by dry method. The gas with equalized pressure passes through the newly added recovery valve, and through the pipeline along the edge of the blast furnace main frame and above the hot air pipeline, it is sent to the dry bag filter dust collector through the newly added jet injection device, and after dust removal and purification, it enters the existing low-pressure gas external network pipeline. The blast furnace gas recovery system participates in the control interlocking of the furnace top equalizing pressure system and the furnace top charging system.
Engineering Achievements
Blast furnace gas conventional recovery upgraded to full recovery for pressure equalization
01 Jiangsu Xugang Iron and Steel Group Co., Ltd. Ironmaking Plant Blast Furnace 2120m³ Top Pressure Equalized Blast Furnace Gas Recovery Transformation
Project Overview:
An additional jet injection recovery valve is installed for blast furnace gas pressure equalization recovery, used for the injection recovery pipeline, with the hydraulic jet injection valve connected to the injector. The original recovery dust collector inlet pipeline is refurbished and the system is modified for full recovery. Due to the increased flow rate at the outlet of the injector, the flow velocity at the outlet of the modified recovery dust collector increases, resulting in increased system resistance. To ensure an appropriate flow rate, a DN600 pipeline is added to the inlet of the recovery dust collector through full recovery calculation. One end of the pipeline is connected to the injector and the other end is connected to the dust collector, with additional openings in the dust collector. A water drainage or hydrophobic device is installed between the rear end of the injector and the inlet of the dust collector box. The power source for the injector is obtained from the nearby pressure-equalized clean gas pipeline.
Basic Parameters
Serial Number |
Blast furnace charging tank injector main performance technical requirements |
||
| 1 | Blast furnace blowing out: furnace top pressure when the relief valve is open; |
15 | kpa |
| 2 | Blast furnace blowing in: furnace top pressure when the relief valve is closed. |
30 | kpa |
02 Changzhou Zhongfa Ironmaking Co., Ltd. Blast Furnace No. 9 Gas Full Recovery Project
Project Introduction:
After the blast furnace gas pressure equalization recovery system is upgraded to full recovery, it requires the addition of one jet injection recovery valve (DN400), which is used for the injection recovery pipeline. The hydraulic jet injection valve is connected to the injector. The injection gas source comes from the high-pressure clean gas, with a pressure of 200-250 kPa, and the injector is placed in the existing vertical recovery pipeline.
The original recovery pipeline is refurbished and the system is modified for full recovery use. Due to the increased flow rate at the outlet of the injector, the flow velocity of the modified recovery pipeline increases, resulting in increased system resistance. To ensure an appropriate flow rate, through full recovery calculation, a DN600 pipeline is added to the outlet of the recovery, with one end connected to the injector and the other end connected to the recovery pipeline. The power source for the injector is obtained from the nearby high-pressure clean gas pipeline.
03 Handan Yongyang Special Steel Group Co., Ltd. Ironmaking Plant Blast Furnace No.1 Top Pressure Equalized Blast Furnace Gas Recovery Transformation
Project Introduction:
Current Status of Blast Furnace Conventional Gas Recovery:
Modification Plan:
Modification Plan for Blast Furnace No.1 Gas Recovery to Full Recovery:
After upgrading the blast furnace No.1 gas recovery system to full recovery, it is necessary to add one jet injection recovery valve (DN400) for the injection recovery pipeline. The hydraulic jet injection valve is connected to the injector. The injection gas source comes from the high-pressure clean gas with a pressure of 240 kPa. The injector is placed on the existing semi-recovery dust collector support platform. The steel platform will be modified.
For the original blast furnace No.1, the inlet pipeline of the recovery dust collector will be refurbished and modified for semi-recovery use. Due to the increased flow rate at the outlet of the injector, the flow velocity at the outlet of the modified recovery dust collector will increase, resulting in increased system resistance. To ensure an appropriate flow velocity, through full recovery calculation, a DN500 pipeline will be added to the inlet of the recovery dust collector, with one end connected to the injector and the other end connected to the dust collector, with additional openings added to the dust collector.
Refurbishment of the dust collector: Addition of openings to the inlet and outlet pipelines.
Expansion joints are not provided at the inlet and outlet of the dust collector (according to the layout of the recovery pipeline and the nature of the gas, the elbows after the layout of the pipeline are sufficient to absorb their own expansion).
The newly modified jet injection valve in this project will be controlled remotely by hydraulic control. The butterfly valves and blank valves of the newly added pipelines will be controlled remotely on-site.
Blast Furnace Gas Full Recovery + Dry Dust Removal
| Serial Number | Project | Parameters |
| 1 | Blast furnace volume | / |
| 2 | Effective volume of the bunker | 18m³ |
| 3 | Diameter of the equalizing discharge pipe | DN300 |
| 4 | Gas temperature in the bunker | ≥130ºC |
| 5 | Output | 2650T/Day |
| 6 | Batch size | 7-9/H |
Company Profile
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