CN113736954B - Method for supplying steam and improving superheat degree of steam for steelmaking heat accumulator - Google Patents
Method for supplying steam and improving superheat degree of steam for steelmaking heat accumulator Download PDFInfo
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- CN113736954B CN113736954B CN202111020181.0A CN202111020181A CN113736954B CN 113736954 B CN113736954 B CN 113736954B CN 202111020181 A CN202111020181 A CN 202111020181A CN 113736954 B CN113736954 B CN 113736954B
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- steam
- heat accumulator
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- refining
- heating
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/38—Removal of waste gases or dust
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G1/00—Steam superheating characterised by heating method
- F22G1/005—Steam superheating characterised by heating method the heat being supplied by steam
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention relates to a method for supplying steam and improving the superheat degree of steam of a steelmaking heat accumulator, belonging to the technical field of steelmaking vaporization cooling methods. The technical scheme of the invention is as follows: cutting off and plugging the gas type overheating device, and changing the gas type overheating device into a steam direct connection large bypass; steam extracted by a steam turbine with similar pressure and relatively high temperature is used as a heating source to be mixed with saturated steam decompressed and separated by the heat accumulator for heating; a steam extraction pipe network of the steam turbine, a heat accumulator for RH vacuum refining steam heating and a steam heat accumulator for producing rich steam and discharging steam is made into a linkage mode. The beneficial effects of the invention are: the steam extraction of the power plant is used for replacing a gas type micro overheating device, the high-efficiency energy-saving heat accumulator is used for supplying RH refining steam, the technology is advanced, the process is reasonable, the equipment is simple, the operation is reliable, the maintenance is easy, the energy is saved, the efficiency is high, and the method is suitable for the process popularization that the steam extraction of the power plant steam turbine with corresponding pressure and temperature grades in a metallurgical enterprise can be used for replacing the heat accumulator of the gas type micro overheating device system for RH vacuum refining.
Description
Technical Field
The invention relates to a method for supplying steam and improving the superheat degree of steam of a steelmaking heat accumulator, belonging to the technical field of steelmaking vaporization cooling methods.
Background
Due to the characteristics of the steelmaking blowing process, the steam generated by the vaporization cooling system is discontinuous, and the flow rate is greatly changed. Taking a 120t/h steel-making furnace as an example, the blowing of one furnace of steel can be carried out for about 10-15 minutes, the saturated steam flow can be 17-51t/h, the instantaneous maximum can reach 60t/h, and the impact on a steam pipe network is large, so that the adoption of the steam heat accumulator is a very effective balance and buffer method. Before the invention, the heat recovered by the steam heat accumulator is used for vacuumizing an RH vacuum refining device through reduced pressure evaporation. In order to ensure the service life and the injection effect of a nozzle of the vacuum injection pump, the RH vacuum device requires that steam is slightly superheated by 10-20 ℃, namely, the steam of the converter vaporization cooling system is subjected to temperature adjustment and overheating treatment by using a low-pressure steam gas type overheating device. However, the design of the gas type overheating device is too simplified, the failure rate is high, the influence of load fluctuation is large, the heat loss is large, the efficiency is low, the energy waste is large, and the system stability is low.
Disclosure of Invention
The invention aims to provide a method for supplying steam and improving the superheat degree of steam for a steelmaking heat accumulator, which utilizes the steam extraction of a power plant to replace a gas type micro superheat device, utilizes a high-efficiency energy-saving heat accumulator to supply steam for RH refining, has advanced technology, reasonable process, simple equipment, reliable operation, easy maintenance, energy saving and high efficiency, is suitable for the process popularization that the steam extraction of a steam turbine of the power plant with corresponding pressure and temperature grades in a metallurgical enterprise can be used for replacing the heat accumulator of a gas type micro superheat device system to supply RH vacuum refining, and effectively solves the problems in the background technology.
The technical scheme of the invention is as follows: a method for supplying steam and improving the superheat degree of steam for a steelmaking heat accumulator comprises the following steps:
(1) Cutting off and plugging the gas type overheating device, and changing the gas type overheating device into a steam direct connection large bypass;
(2) Steam extracted by a steam turbine with similar pressure and relatively high temperature is used as a heating source to be mixed with saturated steam decompressed and separated by the heat accumulator for heating;
(3) A steam extraction pipe network of the steam turbine, a heat accumulator for RH vacuum refining steam heating and a steam heat accumulator for producing rich steam and discharging steam is made into a linkage mode.
In the step (1), the steam direct connection large bypass is a bypass with the same pipe diameter added to a gas type micro-overheating device for supplying RH refining to the outlet of the heat accumulator.
And (2) adjusting the amount of the direct-supplement superheated steam from the steam extraction pipeline of the power plant through the adjusting valve to mix and heat RH refined steam supplied to the outlet of the heat accumulator so as to improve the degree of superheat of the steam.
In the step (3), during the long-term steam shutdown period of RH refining, the steam extraction and the heat accumulator of the power plant are both operated under reduced pressure, the direct steam supply machine extracts steam, the regulating valve is closed, and the steam at the outlet of the heat accumulator is supplied to a production steam pipe network through a steam distributing cylinder; and in the interval of RH refining furnace replacement, after the steam heat accumulator reaches the maximum energy storage capacity, supplying steam to a steam production pipe network through a quick pressure relief pipeline and a branch cylinder.
The invention has the beneficial effects that: the steam extraction of the power plant is used for replacing a gas type micro overheating device, the high-efficiency energy-saving heat accumulator is used for supplying RH refining steam, the technology is advanced, the process is reasonable, the equipment is simple, the operation is reliable, the maintenance is easy, the energy is saved, the efficiency is high, and the method is suitable for the process popularization that the steam extraction of the power plant steam turbine with corresponding pressure and temperature grades in a metallurgical enterprise can be used for replacing the heat accumulator of the gas type micro overheating device system for RH vacuum refining.
Drawings
Fig. 1 is a diagram of a regenerator steam charging-supplying system of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more fully described below with reference to the accompanying drawings, it is obvious that the described embodiments are a small part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person skilled in the art without making creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
A method for supplying steam and improving the superheat degree of steam for a steelmaking heat accumulator comprises the following steps:
(1) Cutting off and plugging the gas type overheating device, and changing the gas type overheating device into a steam direct connection large bypass;
(2) Steam extracted by a steam turbine with similar pressure and relatively high temperature is used as a heating source to be mixed with saturated steam decompressed and separated by the heat accumulator for heating;
(3) A steam extraction pipe network of the steam turbine, a heat accumulator for RH vacuum refining steam heating and a steam heat accumulator for producing rich steam and discharging steam is made into a linkage mode.
In the step (1), the steam direct connection large bypass is a bypass which is formed by adding a gas type micro-overheating device for RH refining to the outlet of the heat accumulator and has the same pipe diameter phi 325x8 and is made of 20G materials.
And (2) adjusting the amount of the direct-supplement superheated steam from the steam extraction pipeline of the power plant through the adjusting valve to mix and heat RH refined steam supplied to the outlet of the heat accumulator so as to improve the degree of superheat of the steam.
In the step (3), during the long-term steam shutdown period of RH refining, 2.1MPa steam extraction of a power plant and a heat accumulator are both in reduced pressure operation, a direct steam supply machine extracts steam, a regulating valve is closed, and steam at the outlet of the heat accumulator is supplied to a 1.0MPa production steam pipe network through a branch cylinder; and in the RH refining furnace changing interval, after the steam heat accumulator reaches the maximum energy storage capacity, supplying steam to a 1.0MPa production steam pipe network through a quick pressure relief pipeline and a steam distributing cylinder.
In practical application, the characteristics of slightly higher steam extraction pressure of a power plant and outlet pressure of a heat accumulator and higher superheat degree are utilized, and the following technical measures are adopted: (1) A gas type micro-overheating device for RH refining at the outlet of the heat accumulator is additionally provided with a bypass with the same pipe diameter phi 325x8 (made of 20G); (2) Extracting steam from a power plant, connecting a phi 108x6 (material 20G) pipeline, adjusting the quantity of direct compensation superheated steam through a regulating valve, and performing mixed heating on RH refined steam supplied from the outlet of the heat accumulator to improve the degree of superheat of the steam; (3) In the interval of RH refining furnace change (short-term steam is stopped), the steam heat accumulator is charged with steam, pressurized and stored, after the maximum energy storage capacity is reached, the steam is supplied to a 1.0MPa production steam pipe network through a phi 108x5 (material 20 #) quick pressure release pipeline through a branch cylinder; (4) During the long-term steam shutdown period of RH refining, 2.1MPa steam extraction and a heat accumulator of a power plant are both in reduced pressure operation, a direct steam-supplement steam extraction connection phi 108x6 (material 20G) regulating valve is closed, and the outlet steam of the heat accumulator is supplied to a 1.0MPa production steam pipe network through a steam-distributing cylinder through phi 325x8 (material 20 #) and phi 377x9 (material 20 #); (5) The system optimization program design is carried out on the 2.1MPa steam extraction regulating valve, the RH steam supply regulating valve of the heat accumulator, the RH refined steam temperature regulating valve and the quick pressure relief valve of the power plant, so as to realize the purposes of automatic pressure regulation, temperature regulation and energy saving of the RH refined steam supplied by the steelmaking steam heat accumulator.
Through the application of the innovative technical measures, the gas type micro overheating device with high failure rate and high energy consumption is stopped, the supply of RH refining steam is stabilized, the production is ensured, and the steam utilization efficiency is improved.
Claims (1)
1. A method for supplying steam and improving the superheat degree of steam for a steelmaking heat accumulator is characterized by comprising the following steps:
(1) Cutting off and plugging the gas type overheating device, and changing the gas type overheating device into a steam direct connection large bypass;
(2) Steam extracted by a steam turbine with similar pressure and relatively high temperature is used as a heating source to be mixed with saturated steam decompressed and separated by the heat accumulator for heating;
(3) A steam turbine steam extraction and heat accumulator for RH vacuum refining steam heating and a steam heat accumulator for producing rich steam and discharging steam pipe network are made into a linkage mode;
in the step (1), the steam direct connection large bypass is a bypass with the same pipe diameter added to a gas type micro-overheating device for RH refining at the outlet of the heat accumulator;
in the step (2), the steam extraction of the power plant is connected with a pipeline, and the amount of the direct-supplement superheated steam is adjusted by a regulating valve to perform mixed heating on RH refined steam supplied to the outlet of the heat accumulator so as to improve the degree of superheat of the steam;
in the step (3), during the long-term steam shutdown period of RH refining, the steam extraction and the heat accumulator of the power plant are both operated under reduced pressure, the direct steam supply machine extracts steam, the regulating valve is closed, and the steam at the outlet of the heat accumulator is supplied to a production steam pipe network through a steam distributing cylinder; and in the RH refining furnace changing interval, after the steam heat accumulator reaches the maximum energy storage capacity, supplying steam to a steam production pipe network through a quick pressure relief pipeline and a steam distributing cylinder.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111020181.0A CN113736954B (en) | 2021-09-01 | 2021-09-01 | Method for supplying steam and improving superheat degree of steam for steelmaking heat accumulator |
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| CN202111020181.0A CN113736954B (en) | 2021-09-01 | 2021-09-01 | Method for supplying steam and improving superheat degree of steam for steelmaking heat accumulator |
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| CN113736954B true CN113736954B (en) | 2023-01-24 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP0976914B1 (en) * | 1998-07-29 | 2003-02-26 | ALSTOM (Switzerland) Ltd | System and process providing rapid power reserve in combined gas- and steam turbines plants |
| CN100558912C (en) * | 2007-08-09 | 2009-11-11 | 首钢总公司 | Saturation steam and superheated vapour are mixed for the device that vacuum refining furnace uses |
| CN101464094B (en) * | 2009-01-16 | 2012-06-27 | 秦皇岛首秦金属材料有限公司 | Steam multi-source combined supply method for finery evacuation |
| CN101706222B (en) * | 2009-04-29 | 2011-10-05 | 中冶赛迪工程技术股份有限公司 | Transformation heat accumulator system |
| CN107060919B (en) * | 2017-05-31 | 2019-05-03 | 邯钢集团邯宝钢铁有限公司 | A kind of gas fired-boiler steam turbine power generation Quick starting energy-saving device and method |
| CN212102922U (en) * | 2020-03-10 | 2020-12-08 | 中冶南方工程技术有限公司 | Refining vacuumizing system utilizing converter saturated steam |
| CN111607687A (en) * | 2020-04-30 | 2020-09-01 | 邯郸钢铁集团有限责任公司 | Energy-saving device and method for improving steam quality of steelmaking RH refining furnace |
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