CN217127464U - Steelmaking steam comprehensive utilization recovery system - Google Patents
Steelmaking steam comprehensive utilization recovery system Download PDFInfo
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- CN217127464U CN217127464U CN202220303241.3U CN202220303241U CN217127464U CN 217127464 U CN217127464 U CN 217127464U CN 202220303241 U CN202220303241 U CN 202220303241U CN 217127464 U CN217127464 U CN 217127464U
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Abstract
The utility model relates to the technical field of steelmaking steam recovery equipment, in particular to a steelmaking steam comprehensive utilization and recovery system, which comprises a first steelmaking converter, a second steelmaking converter, a third steelmaking converter, a fourth steelmaking converter and a shunt pipeline; the output end of the first steel-making converter and the output end of the second steel-making converter are connected with a first steam conveying pipeline, and a first spherical heat accumulator, a first horizontal heat accumulator, a second spherical heat accumulator and a second horizontal heat accumulator are sequentially connected to the first steam conveying pipeline along the steam conveying direction. The utility model discloses a steelmaking steam comprehensive utilization recovery system, its structure is simplified, but reduction in production cost reduces energy consumption.
Description
Technical Field
The utility model relates to a steelmaking steam recovery plant technical field, in particular to steelmaking steam comprehensive utilization recovery system.
Background
The process of a steel converter of a general full-flow steel company generates saturated steam with certain pressure and temperature, and the rest steam enters a saturated steam pipe network of the company except for a part of the process itself and is used for other downstream users such as heating, power generation and the like.
For some high-quality and special steel production iron and steel enterprises, in order to meet smelting requirements, refining processes such as an RH furnace, a VD furnace and the like are arranged, vacuum deoxidation smelting needs to be established in the refining process, and one scheme at present is mechanical vacuum pumping, and the defects of large investment, complex structure, large maintenance workload and the like exist; and the other method adopts micro superheated steam injection to establish vacuum, and is generally adopted by more enterprises due to small investment and quick response.
However, in the second scheme, high-quality steam is adopted in more iron and steel enterprises to meet the requirements of RH and VD furnace vacuum pumping, the quality-based use of a steam system cannot be guaranteed, particularly the high-quality steam, such as steam produced by a power station boiler, cannot be utilized in a stepped manner, the depreciation is serious, the energy waste phenomenon exists, the cost per ton of unit procedure is too high, and the method is not matched with zero-energy consumption and negative-energy consumption steelmaking advocated in the current country.
SUMMERY OF THE UTILITY MODEL
The utility model aims at: the utility model provides a steelmaking steam comprehensive utilization recovery system, its structure is simplified, but reduction in production cost reduces energy consumption.
In order to achieve the above purpose, the technical scheme of the utility model is as follows:
a comprehensive utilization and recovery system for steelmaking steam comprises a first steelmaking converter, a second steelmaking converter, a third steelmaking converter, a fourth steelmaking converter and a shunt pipeline;
the output end of the first steel-making converter and the output end of the second steel-making converter are connected with a first steam conveying pipeline, and a first spherical heat accumulator, a first horizontal heat accumulator, a second spherical heat accumulator and a second horizontal heat accumulator are sequentially connected to the first steam conveying pipeline along the steam conveying direction;
the output end of the third steel-making converter and the output end of the fourth steel-making converter are connected with a second steam conveying pipeline, and a first spherical heat accumulator and a second spherical heat accumulator are sequentially connected to the second steam conveying pipeline along the steam conveying direction;
the first spherical heat accumulator is connected with the second spherical heat accumulator through a first communication pipeline;
the output end of the first steam conveying pipeline and the output end of the second steam conveying pipeline are both connected with a shunt pipeline, and a first overheating device, a second overheating device and a third overheating device are sequentially connected to the shunt pipeline from top to bottom;
the first overheating device is connected with the first RH furnace, the second overheating device is connected with the second RH furnace, and the third overheating device is connected with the VD furnace.
As an improvement: and a second communication pipeline is arranged on the first communication pipeline, and the output end of the second communication pipeline is connected with the generator set.
As an improvement: and the shunt pipeline is also connected with a low-pressure saturated steam generator set.
As an improvement: the output end of the first overheating device is connected with the output end of the second overheating device through a third communication pipeline.
To sum up, the utility model discloses following beneficial effect has:
(1) by using the spherical heat accumulator, the cost of a steel converter steam recovery system is reduced, the system structure is simplified, and the recovered and externally supplied steam is stable and reliable;
(2) the self-circulation utilization of the steelmaking steam is realized by using the overheating device, the use of external high-quality steam for degradation and degradation is avoided, and the production cost of each ton of steel is reduced while the production stability of a steelmaking refining system is ensured;
(3) through the optimal design steam pipeline arrangement, the steam temperature drop and the pressure loss of the system are reduced, and unnecessary energy loss is avoided.
Drawings
In order to more clearly illustrate the technical solution in the embodiment of the present invention, the drawings used in the embodiment or the description of the prior art will be briefly described below.
FIG. 1 is a schematic view showing the connection of the whole structure of a comprehensive utilization and recovery system for steelmaking steam;
FIG. 2 is a diagram of a low pressure steam pipe network and a 6MW power generator set after an original steelmaking steam system is recovered by four 150m3 horizontal heat accumulators;
FIG. 3 is a schematic diagram of the steam for the RH furnace in the prior art;
FIG. 4 is a table of data for steam quantity, temperature, pressure, etc. for each component;
FIG. 5 is a steam supply diagram of the present recovery system;
wherein: 1. a first steelmaking converter; 2. a second steelmaking converter; 3. a third steel converter; 4. a fourth steel converter; 5. a diversion pipeline; 6. a first steam delivery conduit; 7. a first spherical heat accumulator; 8. a first horizontal heat accumulator; 9. a second spherical heat accumulator; 10. a second horizontal heat accumulator; 11. a second steam delivery conduit; 12. a first communication pipe; 13. a first superheating device; 14. a second superheating device; 15. a third superheating device; 16. a low-pressure saturated steam generator set; 17. a second communication conduit; 18. a generator set; 19. a third communication conduit; 20. a first RH furnace; 21. a second RH furnace; 22. and (4) a VD furnace.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, a comprehensive utilization and recovery system for steelmaking steam includes a first steelmaking converter 1, a second steelmaking converter 2, a third steelmaking converter 3, a fourth steelmaking converter 4 and a diversion pipeline 5;
the output end of the first steel-making converter 1 and the output end of the second steel-making converter 2 are connected with a first steam conveying pipeline 6, and a first spherical heat accumulator 7, a first horizontal heat accumulator 8, a second spherical heat accumulator 9 and a second horizontal heat accumulator 10 are sequentially connected to the first steam conveying pipeline 6 along the steam conveying direction;
the output end of the third steel-making converter 3 and the output end of the fourth steel-making converter 4 are connected with a second steam conveying pipeline 11, and a first spherical heat accumulator 7 and a second spherical heat accumulator 9 are sequentially connected on the second steam conveying pipeline 11 along the steam conveying direction;
the first spherical heat accumulator 7 is connected with the second spherical heat accumulator 9 through a first communication pipeline 12;
the output end of the first steam conveying pipeline 6 and the output end of the second steam conveying pipeline 11 are both connected with a shunt pipeline 5, and a first overheating device 13, a second overheating device 14 and a third overheating device 15 are sequentially connected to the shunt pipeline 5 from top to bottom; the shunt pipeline 5 is also connected with a low-pressure saturated steam generator set 16; a second communication pipeline 17 is arranged on the first communication pipeline 12, and the output end of the second communication pipeline 17 is connected with a generator set 18; the output of the first superheating device 13 is connected to the output of the second superheating device 14 through a third communication pipe 19.
The first superheating device 13 is connected with the first RH furnace 20, the second superheating device 14 is connected with the second RH furnace 21, and the third superheating device 15 is connected with the VD furnace 22.
The working principle is as follows: firstly, deep and detailed statistical accounting is carried out on the production rhythm and the steam generation quantity of the steelmaking converter process of a target enterprise. The production of the steel-making converter has intermittency, volatility and periodicity, and when the converter blows, the vaporization cooling device generates steam; and because the smelting steel type is different, the blowing time can also be different, and the steam volume of producing also is different. Therefore, the thermodynamic calculation of the system is needed according to the user condition, and the heat accumulator is arranged to stabilize the steam output.
As for the selection of the heat accumulator, the horizontal heat accumulator is conventionally used at present, and the defects of large floor area, small heat accumulation capacity and the like exist. The novel spherical heat accumulator has the advantages of small occupied area, simplified structure, low investment, less heat dissipation and the like.
After the stable output of the externally supplied steam is ensured by the spherical heat accumulator, the steam needs to be heated and superheated by a superheating device according to the steam parameter requirements of the steelmaking RH and VD furnaces, and then the steam is sent to the inlet of a steelmaking refining vacuum pump through a pipeline.
The saturated steam generated by the steel-making converter is preferentially supplied to the RH furnace and the VD furnace through the superheating device (in the embodiment, the RH furnace and the VD furnace are both vacuum refining furnaces), the second sequence user is the saturated steam generator set 18, and if the saturated steam is rich, the saturated steam enters the low-pressure steam pipe network of the enterprise for other users.
The method comprises the following specific steps: in the present embodiment, the first steel converter 1 and the second steel converter 2 are both 60t (t is measured in units of tons) and have an average steam flow of 25.2t/h, the third steel converter 3 and the fourth steel converter 4 are both 120t and have an average steam flow of 16t/h, and the first horizontal regenerator 8 and the second horizontal regenerator 10 have a capacity of 150m 3 The capacities of the first spherical heat accumulator 7 and the second spherical heat accumulator 9 are 650m 3 The first superheating device 13, the second superheating device 14 and the third superheating device 15 are all low-pressure steam gas-fired superheating devices.
Referring to FIGS. 1-3, in the present embodiment, the whole set of recycling system for steelmaking steam is composed of three original 150m 3 The horizontal heat storage is changed into two current 150m 3 A horizontal heat accumulator (a first horizontal heat accumulator 8 and a second horizontal heat accumulator 10 respectively) and two heat accumulators 650m 3 The spherical heat accumulators (the first spherical heat accumulator 7 and the second spherical heat accumulator 9 respectively) improve the capacity of a heat accumulation system and increase the reliability and stability of steam supply.
In the embodiment, the average steam recovery of the existing 2 x 120t steel-making converters (the third steel-making converter 3 and the fourth steel-making converter 4) is 25.2 t/h; the average recovered steam of the existing 2 x 60t steel-making converters (the first steel-making converter 1 and the second steel-making converter 2) is 16.0 t/h. According to the condition that the operation parameters of the prior steelmaking vaporization cooling system are not changed: the operation pressure of the steam drum is not increased, (the working pressure of the converter steam drum is 1.8MPa, the resistance loss is 0.2MPa), and the heat release pressure is considered according to 1.2 MPa; the heat accumulator has small heat charging and discharging pressure difference, and the volume of the heat accumulator can not meet the requirement of the steam consumption for smelting 2 RH furnaces. And the smelting period of the 1 120tRH furnace is 30 minutes, and the vacuumizing time is 15 minutes. The average steam consumption is 9.7 t/h; the pressure of the steam is 1.0MPa, and the temperature of the steam is 200 ℃. The smelting period of a 1-seat 60tVD furnace is 30 minutes, and the vacuumizing time is 15 minutes. The average steam consumption is 4.7 t/h; the pressure of the steam is 1.0MPa, and the temperature of the steam is 200 ℃.
Referring to fig. 4-5, consider current RH furnace production; the average steam consumption was 19.4 t/h. 2The steam recovered by the vaporization cooling of the x 120t steel converter and the vaporization cooling of the 2 x 60t steel converter firstly passes through the heat accumulator (after the steam for removing oxygen is supplied by the recovered steam of the steel rolling), and saturated steam can be supplied to the heat accumulator for 41.20 t/h. Because the charging and discharging pressure difference of the original heat accumulator is small, the heat accumulation capacity is only 7.6 t/h; under the conditions that the heat charging pressure of a heat accumulator is 1.6MPa (G) and the heat release pressure is 1.2MPa (G), the refining production steam of two RH furnaces is satisfied, and the total required heat storage volume is calculated to be 1528m 3 。
After the VD furnace 22 is put into operation, the total average steam consumption of the vacuum refining furnace is 31.4t/h, and the peak maximum steam consumption is 53.8 t/h. The steam recovered by the vaporization cooling of the 2 x 120t steel-making converter and the vaporization cooling of the 2 x 60t steel-making converter firstly passes through the heat accumulator (after the steam for removing oxygen is supplied by the recovered steam of steel rolling), saturated steam can be supplied to the outside for 41.20t/h, the average steam consumption requirement of 3 sets of vacuum refining devices can be met according to calculation, but the maximum steam production requirement of 2 sets of RH furnaces and 1 set of VD furnaces cannot be met. Considering that the maximum steam utilization conditions of the VD furnace 22 and the RH furnace may exist simultaneously, a steam extraction of the generator set 18 provides a path of supplementary steam source, and under the working condition that the converter is generating, the maximum steam supplementary amount is 15 t/h: the steam with the pressure of 2.05MPa and the high temperature of 535 ℃ is supplied by temperature reduction and pressure reduction.
Three sets of 25t/h low-pressure steam gas type superheating devices (a first superheating device 13, a second superheating device 14 and a third superheating device 15 respectively) are added, and each set of low-pressure steam gas type superheating device (comprising a burner, a combustion-supporting fan, a combustion-supporting air regulating baffle, a gas regulating valve, a quick closing valve, an automatic ignition device, a flameout protection device, an on-site control cabinet, an explosion door and other accessory facilities and the like) is matched with 1 mixing fan, 1 steam filter cleaner and 1 steam diffusion silencer. Two 650m3 first spherical heat accumulators 7 and second spherical heat accumulators 9 are newly built. The first overheating device 13, the second overheating device 14 and the third overheating device 15 are subjected to distributed control through a DCS, and unattended operation is adopted for starting the overheating devices, waiting for temperature, supplying steam and controlling the pressure and the temperature of the spherical heat accumulator.
The system reduces the cost of the steam recovery system of the steelmaking converter by using the spherical heat accumulator, simplifies the system structure, and is stable and reliable in recovery and external supply of steam; the self-circulation utilization of the steelmaking steam is realized by using the overheating device, the use of external high-quality steam for degradation and degradation is avoided, and the production cost of each ton of steel is reduced while the production stability of a steelmaking refining system is ensured; through the optimal design steam pipeline arrangement, the steam temperature drop and the pressure loss of the system are reduced, and unnecessary energy loss is avoided.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will appreciate that; the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.
Claims (4)
1. A comprehensive utilization and recovery system for steelmaking steam is characterized by comprising a first steelmaking converter (1), a second steelmaking converter (2), a third steelmaking converter (3), a fourth steelmaking converter (4) and a diversion pipeline (5);
the output end of the first steel-making converter (1) and the output end of the second steel-making converter (2) are connected with a first steam conveying pipeline (6), and a first spherical heat accumulator (7), a first horizontal heat accumulator (8), a second spherical heat accumulator (9) and a second horizontal heat accumulator (10) are sequentially connected to the first steam conveying pipeline (6) along the steam conveying direction;
the output end of the third steel-making converter (3) and the output end of the fourth steel-making converter (4) are connected with a second steam conveying pipeline (11), and a first spherical heat accumulator (7) and a second spherical heat accumulator (9) are sequentially connected to the second steam conveying pipeline (11) along the steam conveying direction;
the first spherical heat accumulator (7) is connected with the second spherical heat accumulator (9) through a first communication pipeline (12);
the output end of the first steam conveying pipeline (6) and the output end of the second steam conveying pipeline (11) are both connected with a shunt pipeline (5), and a first overheating device (13), a second overheating device (14) and a third overheating device (15) are sequentially connected to the shunt pipeline (5) from top to bottom;
the first overheating device (13) is connected with a first RH furnace (20), the second overheating device (14) is connected with a second RH furnace (21), and the third overheating device (15) is connected with a VD furnace (22).
2. The steelmaking steam comprehensive utilization and recovery system as claimed in claim 1, wherein a second communicating pipeline (17) is arranged on the first communicating pipeline (12), and the output end of the second communicating pipeline (17) is connected with a generator set (18).
3. The comprehensive steelmaking steam recycling system as claimed in claim 1, wherein a low-pressure saturated steam generator set (16) is further connected to said flow dividing pipe (5).
4. The steelmaking steam integrated recycling system as claimed in claim 1, characterised in that the output of said first superheating means (13) is connected to the output of said second superheating means (14) through a third communication pipe (19).
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| CN202220303241.3U CN217127464U (en) | 2022-02-15 | 2022-02-15 | Steelmaking steam comprehensive utilization recovery system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115466827A (en) * | 2022-08-29 | 2022-12-13 | 武汉钢铁有限公司 | Double-plant three-unit combined heat storage RH vacuum refining steam system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115466827A (en) * | 2022-08-29 | 2022-12-13 | 武汉钢铁有限公司 | Double-plant three-unit combined heat storage RH vacuum refining steam system |
| CN115466827B (en) * | 2022-08-29 | 2023-08-18 | 武汉钢铁有限公司 | Double-factory three-unit combined heat storage RH vacuum refining steam system |
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