CN111607687A - Energy-saving device and method for improving steam quality of steelmaking RH refining furnace - Google Patents
Energy-saving device and method for improving steam quality of steelmaking RH refining furnace Download PDFInfo
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- CN111607687A CN111607687A CN202010363846.7A CN202010363846A CN111607687A CN 111607687 A CN111607687 A CN 111607687A CN 202010363846 A CN202010363846 A CN 202010363846A CN 111607687 A CN111607687 A CN 111607687A
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- 238000009628 steelmaking Methods 0.000 title claims abstract description 76
- 238000007670 refining Methods 0.000 title claims abstract description 67
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- 239000010959 steel Substances 0.000 claims abstract description 31
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- 229920006395 saturated elastomer Polymers 0.000 description 7
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- 230000000740 bleeding effect Effects 0.000 description 2
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Abstract
An energy-saving device and method for improving the steam quality of a steelmaking RH refining furnace belong to the technical field of steelmaking RH vacuum refining furnace equipment and method. The technical scheme is as follows: the steam turbine is connected with the protection device through the auxiliary steam extraction control of the steam turbine, the high-pressure heater of the steam turbine body is connected with the protection device through the auxiliary steam extraction control of the steam turbine and the auxiliary steam extraction control of the steam turbine, the auxiliary steam extraction control of the steam turbine is connected with the spherical heat accumulator through a steam pipeline, the spherical heat accumulator is connected with the steam pipeline for the steelmaking RH furnace through a steam pipeline and a steam pipeline, the spherical heat accumulator is connected with the low-pressure steam pipe network of the iron and steel enterprise through a steam pipeline and a low-pressure steam control device of the iron and steel enterprise, and the spherical heat accumulator is further connected with the temperature. The invention can provide high-quality steam for the steel-making RH refining furnace, avoids the problems of low use of high-pressure superheated steam, large amount of steam emission and environmental pollution, and avoids the major potential safety hazard of overpressure and overtemperature of equipment.
Description
Technical Field
The invention relates to a steam vacuumizing energy-saving device and method for a steelmaking RH refining furnace of a steel enterprise, belonging to the technical field of steelmaking RH vacuum refining furnace equipment and method.
Background
At present, a steel-making RH vacuum refining furnace is a vacuum smelting device. With the development and development of vacuum steelmaking technology, RH vacuum refining furnaces are largely adopted by converter processes because of the adoption of the technology of circulating molten steel in a vacuum tank, thereby achieving the advantages of short treatment time, high efficiency and capability of being matched with converter continuous casting. In the RH vacuum refining furnace device for steel making, a vacuum pump for manufacturing vacuum is key equipment of the refining furnace. The vacuum pump works by spraying steam, the quality and the steam using degree of the used steam are very strict by the vacuum pump, the steam is required to be superheated steam, meanwhile, during the vacuum pumping of the vacuum pump, the steam pressure, the temperature and the flow are required to be stably supplied, otherwise, a vacuum system cannot reach the vacuum degree within a specified time, and the RH refining fails.
At present, the method for superheating steam for vacuumizing of a steel-making RH vacuum refining furnace of an iron and steel enterprise mainly comprises two methods:
the method comprises the steps of using a steam mixing device, mixing superheated steam generated by temperature reduction and pressure reduction of high-pressure superheated steam of a power station boiler with saturated steam generated by vaporization cooling of a converter flue, and mixing high-quality superheated steam with saturated steam generated by a converter to achieve steam pressure and superheat degree during vacuumizing of a refining RH furnace.
And secondly, a small amount of high-temperature smoke generated by the combustion of coke oven coal gas is used for heating saturated steam generated by the vaporization cooling of a converter flue, the saturated steam is directly used for vacuumizing the RH furnace after the requirement of the superheat degree of the steam is met, and during the refining of the RH furnace, the high-pressure superheated steam of the power station boiler is subjected to temperature reduction and pressure reduction to supplement discontinuous converter steam, so that the vacuum pumping continuity of the RH furnace is ensured.
The smelting of the steel-making RH vacuum refining furnace has the problems of discontinuity, discontinuity and large fluctuation of steam consumption, the quality requirement of superheated steam is high, and the temperature of the superheated steam is required to be maintained at 220-300 ℃ all the time. Two steam using modes have the following problems in the actual production process:
problem 1: when the RH stove is in the evacuation intermittence, no superheated steam is consumed, steam in the pipeline can become condensate water, before the RH stove is started again for evacuation, the steam pipeline needs to be started in advance to carry out production preparations such as pipeline drainage and preheating, and the requirement of irregular frequent operation of the RH stove cannot be met. In order to ensure that the superheated steam pipeline for refining is always in a hot standby state and meet the requirement of refining vacuum pumping at any time, a steam starting and bleeding regulating valve is arranged on a steam mixing device, when the temperature of the superheated steam is lower than 240 ℃, the bleeding valve is opened, the steam is discharged to the atmosphere, the minimum flow rate of a medium in the pipeline is maintained, and the temperature of the superheated steam is ensured. Thus, a large amount of steam is discharged into the atmosphere, and heat energy waste and noise environmental pollution are caused.
Problem 2: the high-pressure superheated steam of the power station boiler is reduced to be mixed with saturated steam through temperature reduction and pressure reduction, so that a great amount of high-quality superheated steam energy is wasted.
Problem 3: the two methods for steam superheating for vacuum pumping frequently occur in the actual production process, superheated steam of a power station boiler is not mixed with saturated steam of a converter in time, and the steam pressure temperature and fluctuation influence the vacuum pumping of the RH refining furnace.
Disclosure of Invention
The invention aims to solve the technical problem of providing an energy-saving device and an energy-saving method for improving the steam quality of a steelmaking RH refining furnace, which can enable a steam turbine generator unit of a steel enterprise to directly supply one section of extracted steam to the steelmaking RH refining furnace for vacuum pumping, can effectively solve the problem of frequent production halt of the refining furnace caused by unstable steam quality of the steelmaking RH refining furnace, avoid the current situation of high-quality and low-use of high-pressure superheated steam, and avoid the problems of energy waste and environmental pollution caused by direct discharge of a large amount of steam.
The technical scheme for solving the technical problems is as follows:
an energy-saving device for improving the steam quality of a steelmaking RH refining furnace comprises a steam turbine, a high-pressure heater of a steam turbine body, a temperature and pressure reducing device, a steam turbine auxiliary steam extraction control and protection device, a spherical heat accumulator, a steam control device for a steelmaking RH furnace, a low-pressure steam control device of a steel enterprise, a PLC Siemens control device and a heat accumulator steam exhaust silencer, wherein a power station boiler is respectively connected with the steam turbine and the temperature and pressure reducing device, the steam turbine and the steam turbine auxiliary steam extraction control and protection device are connected, the high-pressure heater of the steam turbine body is connected with the steam turbine auxiliary steam extraction control and protection device, the steam turbine auxiliary steam extraction control and protection device is connected with the spherical heat accumulator through a steam pipeline, the spherical heat accumulator is connected with the steam pipeline for the steelmaking RH furnace through the steam pipeline and the low-pressure steam control device of the steel enterprise through the steam pipeline and the low-pressure steam control device of the, the spherical heat accumulator is connected with the heat accumulator exhaust silencer through a steam pipeline, and the spherical heat accumulator is also connected with the temperature and pressure reduction device through a steam pipeline.
The steam turbine auxiliary steam extraction control and protection device comprises a high-pressure steam pipeline collection box, a pneumatic quick-closing valve, a hydraulic quick-cutting check valve, an electric control valve, an overpressure protection safety valve, an external delivery electric valve, a pressure transmitter and a temperature transmitter, wherein the pneumatic quick-closing valve, the hydraulic quick-cutting check valve and the electric control valve are connected with the high-pressure steam pipeline collection box through a steam pipeline, the high-pressure steam pipeline collection box is connected with the external delivery electric valve through a steam pipeline, the overpressure protection safety valve is installed on the high-pressure steam pipeline collection box through flange connection, and the pressure transmitter and the temperature transmitter are installed on the external delivery steam pipeline respectively.
According to the energy-saving device and the energy-saving method for improving the steam quality of the steelmaking RH refining furnace, the spherical heat accumulator comprises a high-pressure steam pipeline, an overpressure protection safety valve, a pressure transmitter and a temperature transmitter, the high-pressure steam pipeline is connected with the spherical heat accumulator through a flange, and the overpressure protection safety valve, the pressure transmitter and the temperature transmitter are connected with the spherical heat accumulator through flanges.
An energy-saving method using the energy-saving device for improving the steam quality of the steelmaking RH refining furnace comprises the following steps:
a. after the high-pressure steam generated by the boiler works through most of the operating steam turbine, extracting steam from one section of the steam turbine body to provide high-quality superheated steam outwards, and stably supplying the high-quality superheated steam to the spherical heat accumulator through the auxiliary steam extraction control and protection device of the steam turbine;
b. high-quality superheated steam is continuously and stably supplied to the spherical heat accumulator, the steam pipeline for the steel-making RH furnace is stably supplied through the steam pipeline and the steam control device for the steel-making RH furnace, the high-quality superheated steam is supplied to the steel-making RH furnace at any time for vacuumizing refining, and the high-quality superheated steam is stably sent out;
c. when the smelting of the steelmaking RH vacuum refining furnace is finished and the steam is stopped instantly, the steam control device for the steelmaking RH furnace instantly closes the regulating valve, when the pressure of the spherical heat accumulator suddenly rises, the pressure signal and the closing signal of the steam regulating valve for the steelmaking RH furnace are remotely transmitted to the PLC Siemens control device, the PLC Siemens control device sends a control instruction, the electric regulating valve in the steam engine auxiliary steam extraction control and protection device is slowly closed, and the pressure regulating valve in the low-pressure steam control device of the steel enterprise is slowly opened to send qualified steam to the low-pressure pipe network;
d. when the steelmaking RH vacuum refining furnace needs to be in a standby state, steam temperature and pressure signals in a steam control device for the steelmaking RH furnace are transmitted by a remote PLC Siemens control device to send a control instruction, an electric regulating valve in a steam engine auxiliary steam extraction control and protection device is slowly opened, a pressure regulating valve in a low-pressure steam control device of a steel enterprise is slowly closed, when the steam pressure and the temperature of a spherical heat accumulator meet the requirements, steam pressure and temperature feedback signals in the spherical heat accumulator are sent to the PLC Siemens control device, the PLC Siemens control device sends a refining approval signal to the steelmaking RH furnace steam control device, when a formal refining signal sends a regulating valve opening signal in the PLC Siemens control device, and simultaneously, the pressure regulating valve signal in the iron and steel low-pressure steam control device of the enterprise is closed;
e. when the steam turbine is in an emergency stop state, the control device 505E of the steam turbine sends out an emergency stop instruction, a pneumatic quick closing valve, a hydraulic quick-cutting check valve, an electric regulating valve and an outward-sending electric valve in the auxiliary steam extraction control and protection device of the steam turbine are quickly closed, a quick closing signal of the electric regulating valve is fed back to the PLC Siemens device, the PLC Siemens control device sends out a refining stop signal, and a regulating valve in the steam control device for the steelmaking RH furnace is closed;
f. when a steam turbine is stopped or overhauled, high-pressure superheated steam generated by a power station boiler passes through a temperature and pressure reducing device to generate qualified stable steam, when the steam pressure and the temperature sent to a spherical heat accumulator meet requirements, steam pressure and temperature feedback signals in the spherical heat accumulator are sent to a PLC Siemens control device, the PLC Siemens control device sends a refining agreement signal to a steam control device for a steel-making RH furnace, and when a formal refining signal sends a regulating valve opening signal in the PLC Siemens control device, a pressure regulating valve signal in a low-pressure steam control device of a steel enterprise is closed.
The invention has the beneficial effects that:
the invention can ensure that the steam turbine generator unit of the steel enterprise can directly supply the one-section extracted steam to the steelmaking RH refining furnace for vacuum pumping, opens up a new path of the steelmaking RH refining furnace steam of the steel enterprise, effectively solves the problem of frequent shutdown of the refining furnace due to unstable steam quality of the steelmaking RH refining furnace, avoids the problems of low product utilization, large steam emission and environmental pollution of high-pressure superheated steam, and avoids the great potential safety hazard of over-pressure and over-temperature of equipment.
Drawings
FIG. 1 is a schematic structural view of the present invention;
the figures are labeled as follows: the system comprises a steam turbine 1, a steam turbine body high-pressure heater 2, a temperature and pressure reducing device 3, a steam turbine auxiliary steam extraction control and protection device 4, a spherical heat accumulator 5, a steel-making RH furnace steam control device 6, a steel enterprise low-pressure steam control system 7, a PLC Siemens control system 8, a heat accumulator steam exhaust silencer 9, a steel-making RH furnace steam pipeline 10 and a low-pressure steam pipeline network 11.
Detailed Description
The energy-saving device for improving the steam quality of the steelmaking RH refining furnace consists of a steam turbine 1, a high-pressure heater 2 of a steam turbine body, a temperature and pressure reducing device 3, a steam turbine auxiliary steam extraction control and protection device 4, a spherical heat accumulator 5, a steam control device 6 for the steelmaking RH furnace, a low-pressure steam control system 7 of a steel enterprise, a PLC Siemens control system 8 and a heat accumulator steam exhaust silencer 9.
The figure shows that the power station boiler is respectively connected with a steam turbine 1 and a temperature and pressure reducing device 3, and high-pressure steam is sent to the steam turbine 1 to drive the steam turbine 1 to do work. In the shutdown or maintenance of the steam turbine 1, the utility boiler supplies steam to the spherical heat accumulator 5 through the temperature and pressure reducing device 3 to maintain the operation of the plant.
The figure shows that a steam turbine 1 is connected with a steam turbine auxiliary steam extraction control and protection device 4 to provide steam for the steam turbine auxiliary steam extraction control and protection device 4, and meanwhile, a steam turbine body high-pressure heater 2 is connected with the steam turbine auxiliary steam extraction control and protection device 4 to heat the steam.
Shown therein, 400m3The spherical heat accumulator 5 is a connection junction of the whole device, and the steam turbine auxiliary steam extraction control and protection device 4 is connected with the spherical heat accumulator 5 through a steam pipeline. The spherical heat accumulator 5 is connected with a steam pipeline 10 for the steel-making RH furnace through a steam pipeline and a steam control device 6 for the steel-making RH furnace, and provides steam for the steam pipeline 10 for the steel-making RH furnace. Meanwhile, the spherical heat accumulator 5 is connected with a low-pressure steam pipe network 11 of the iron and steel enterprise through a steam pipeline and a low-pressure steam control device 7 of the iron and steel enterprise, and qualified steam is sent to the low-pressure pipe network 11. The spherical heat accumulator 5 is connected with the temperature and pressure reducing device 3 through a steam pipeline, and the operation of the equipment is maintained when the steam turbine 1 is shut down or overhauled. The spherical heat accumulator 5 is connected with a heat accumulator exhaust silencer 9 through a steam pipeline for steam discharge.
The steam turbine auxiliary steam extraction control and protection device 4 comprises a high-pressure steam pipeline collection box, a pneumatic quick-closing valve, a hydraulic quick-cutting check valve, an electric control valve, an overpressure protection safety valve, an external delivery electric valve, a pressure transmitter and a temperature transmitter, wherein the pneumatic quick-closing valve, the hydraulic quick-cutting check valve and the electric control valve are connected with the high-pressure steam pipeline collection box through a steam pipeline, the high-pressure steam pipeline collection box is connected with the external delivery electric valve through a steam pipeline, the overpressure protection safety valve is installed on the high-pressure steam pipeline collection box through flange connection, and the pressure transmitter and the temperature transmitter are installed on the external delivery steam pipeline respectively.
The spherical heat accumulator 5 comprises a high-pressure steam pipeline, an overpressure protection safety valve, a pressure transmitter and a temperature transmitter, wherein the high-pressure steam pipeline is connected with the spherical heat accumulator through a flange, and the overpressure protection safety valve, the pressure transmitter and the temperature transmitter are connected with the spherical heat accumulator through flanges.
The method for improving the steam quality of the steelmaking RH refining furnace is carried out by adopting the following steps:
a. after the high-pressure steam generated by the boiler works through most of the steam turbine 1 in operation, the high-quality superheated steam is extracted from one section of the steam turbine 1 body and provided to the outside, and the high-quality superheated steam is stably supplied to the spherical heat accumulator 5 through the steam turbine auxiliary steam extraction control and protection device 4.
High-pressure superheated steam generated by a power station boiler is prevented from being mixed with converter saturated steam after passing through the temperature and pressure reducing device 3, so that a large amount of high-quality superheated steam energy is wasted, the steam quality exceeds the standard due to untimely mixing, the vacuumizing of the RH refining furnace is influenced, and the major hidden danger of equipment overpressure and overtemperature due to untimely regulation of the temperature and pressure reducing device 3 is thoroughly eliminated.
b. High-quality superheated steam is continuously and stably supplied to the spherical heat accumulator 5, the steam pipeline 10 for the steel-making RH furnace is stably supplied through the steam pipeline and the steam control device 6 for the steel-making RH furnace, the high-quality superheated steam is supplied to the steel-making RH furnace at any time for vacuumizing and refining, and the high-quality superheated steam is stably sent out.
c. When the smelting of the steelmaking RH vacuum refining furnace is finished and steam is stopped instantly, the steam control device 6 for the steelmaking RH furnace instantly closes the regulating valve, when the pressure of the spherical heat accumulator 5 is suddenly increased, the pressure signal and the steam regulating valve closing signal for the steelmaking RH furnace are remotely transmitted to the PLC Siemens control device 8, the PLC Siemens control device 8 sends a control instruction, the electric regulating valve in the steam engine auxiliary steam extraction control and protection device 4 is slowly closed, and the pressure regulating valve in the low-pressure steam control device 7 of the iron and steel enterprise is slowly opened to send qualified steam to the low-pressure pipe network 11. The potential safety hazards of intermittent steam use of the steelmaking RH vacuum refining furnace, long-term existence of large quantities of superheated steam to air dissipation and overpressure of pipelines and equipment are avoided.
d. When the steelmaking RH vacuum refining furnace needs to be in a standby state, steam temperature and pressure signals in a steam control device 6 for the steelmaking RH furnace send control instructions by a remote PLC Siemens control device 8, an electric regulating valve in a steam engine auxiliary steam extraction control and protection device 4 is slowly opened, a pressure regulating valve in a low-pressure steam control device 7 of a steel enterprise is slowly closed, when steam pressure and temperature of a spherical heat accumulator 5 meet requirements, steam pressure and temperature feedback signals in the spherical heat accumulator 5 are sent to the PLC Siemens control device 8, the PLC Siemens control device 8 sends refining approval signals to the steelmaking RH furnace steam control device 6, when formal refining signals send regulating valve opening signals in the PLC Siemens control device 8, and meanwhile, pressure regulating valve signals in the low-pressure steam control device 7 of the steel enterprise are closed. Thoroughly solve steam hot standby state during the refining, a large amount of steam is discharged into the atmosphere, causes the heat energy extravagant and noise environmental pollution situation.
e. When the steam turbine 1 is in an emergency stop state, the control device 505E of the steam turbine 1 sends out an emergency stop instruction, the pneumatic quick closing valve, the hydraulic quick-cutting check valve, the electric regulating valve and the outward-feeding electric valve in the steam turbine auxiliary steam extraction control and protection device 4 are quickly closed, the quick closing signal of the electric regulating valve is fed back to the PLC Siemens device 8, the PLC Siemens control device 8 sends out a refining stop signal, and the regulating valve in the steam control device 6 for the steel-making RH furnace is closed.
f. When the steam turbine 1 is shut down or overhauled, high-pressure superheated steam generated by a power station boiler passes through the temperature and pressure reducing device 3 to generate qualified stable steam, when the steam pressure and the temperature sent to the spherical heat accumulator 5 meet the requirements, steam pressure and temperature feedback signals in the spherical heat accumulator 5 are sent to the PLC Siemens control device 8, the PLC Siemens control device 8 sends a refining agreement signal to the steam control device 6 for the steel-making RH furnace, and when a formal refining signal sends a regulating valve opening signal in the PLC Siemens control device 8, a pressure regulating valve signal in the low-pressure steam control device 7 of a steel enterprise is closed.
One embodiment of the invention is as follows:
a certain iron and steel enterprise assembles 3 converters of 120t/h, 1 RH refining furnace of 120t/h and 2 LF furnaces are matched, and the RH refining furnace for steelmaking conventionally pumps steam and carries out vacuum (steam parameters are that the pressure is more than or equal to 1.5MPa, the temperature is 220-300 ℃ and the steam flow is 5-36 t/h).
The superheated steam generated by a high-temperature high-pressure boiler at 260t/h is output by a self-contained power plant matched with an iron and steel enterprise, the pressure is 9.8Mpa, and the temperature is 540 ℃. After the superheated steam is subjected to temperature and pressure reduction by a steam turbine auxiliary steam extraction control and protection device 4 of 2.1Mpa, the pressure of the superheated steam is more than or equal to 1.5Mpa and the temperature is 280-300 ℃. The high-quality superheated steam is stably supplied to the spherical heat accumulator 5, the steam control device 6 for the steel-making RH furnace is stably supplied through the steam pipeline, the high-quality superheated steam is supplied to the steam pipeline 10 for the steel-making RH furnace at any time for vacuumizing and refining, and the high-quality superheated steam is stably sent out. Since the production is put into operation in 10 months in 2018, the RH refining furnace is never stopped due to the influence of steam varieties, the major potential safety hazard is thoroughly eliminated, and 320 ten thousand yuan of energy conservation and efficiency creation is realized.
Claims (4)
1. The utility model provides an improve economizer of steelmaking RH refining furnace steam quality which characterized in that: the system comprises a steam turbine (1), a steam turbine body high-pressure heater (2), a temperature and pressure reducing device (3), a steam turbine auxiliary steam extraction control and protection device (4), a spherical heat accumulator (5), a steel-making RH furnace steam control device (6), a steel enterprise low-pressure steam control device (7), a PLC Siemens control device (8) and a heat accumulator steam exhaust silencer (9), wherein a power station boiler is respectively connected with the steam turbine (1) and the temperature and pressure reducing device (3), the steam turbine (1) is connected with the steam turbine auxiliary steam extraction control and protection device (4), the steam turbine body high-pressure heater (2) is connected with the steam turbine auxiliary steam extraction control and protection device (4), the steam turbine auxiliary steam extraction control and protection device (4) is connected with the spherical heat accumulator (5) through a steam pipeline, the spherical heat accumulator (5) is connected with the steel-making RH furnace steam pipeline (10) through the steam pipeline and the steel-making RH furnace steam control device (6), the spherical heat accumulator (5) is connected with a low-pressure steam pipe network (11) of a steel enterprise through a steam pipeline and a low-pressure steam control device (7) of the steel enterprise, the spherical heat accumulator (5) is connected with a heat accumulator steam exhaust silencer (9) through a steam pipeline, and the spherical heat accumulator (5) is further connected with a temperature and pressure reducing device (3) through a steam pipeline.
2. The energy-saving device for improving the steam quality of the steelmaking RH refining furnace of claim 1, wherein: the auxiliary steam extraction control and protection device (4) of the steam turbine comprises a high-pressure steam pipeline collection box, a pneumatic quick-closing valve, a hydraulic quick-cutting check valve, an electric regulating valve, an overpressure protection safety valve, an external electric delivery valve, a pressure transmitter and a temperature transmitter, wherein the pneumatic quick-closing valve, the hydraulic quick-cutting check valve and the electric regulating valve are connected with the high-pressure steam pipeline collection box through a steam pipeline, the high-pressure steam pipeline collection box is connected with the external electric delivery valve through a steam pipeline, the overpressure protection safety valve is installed on the high-pressure steam pipeline collection box through flange connection, and the pressure transmitter and the temperature transmitter are installed on the external steam pipeline respectively.
3. The energy-saving device for improving the steam quality of the steelmaking RH refining furnace of claim 1, wherein: the spherical heat accumulator (5) comprises a high-pressure steam pipeline, an overpressure protection safety valve, a pressure transmitter and a temperature transmitter, wherein the high-pressure steam pipeline is connected with the spherical heat accumulator through a flange, and the overpressure protection safety valve, the pressure transmitter and the temperature transmitter are connected with the spherical heat accumulator through flanges.
4. The energy-saving method of the energy-saving device for improving the steam quality of the steelmaking RH refining furnace is characterized in that: the method comprises the following steps:
a. after the high-pressure steam generated by the boiler works through most of the steam turbine (1) in operation, extracting steam from one section of the steam turbine (1) body to provide high-quality superheated steam outwards, and stably supplying the high-quality superheated steam to the spherical heat accumulator (5) through the steam turbine auxiliary steam extraction control and protection device (4);
b. high-quality superheated steam is continuously and stably supplied to the spherical heat accumulator (5), a steam pipeline (10) for the steel-making RH furnace is stably supplied through a steam pipeline and a steam control device (6) for the steel-making RH furnace, the high-quality superheated steam is supplied to the steel-making RH furnace at any time for vacuumizing and refining, and the high-quality superheated steam is stably sent out;
c. when the smelting of the steelmaking RH vacuum refining furnace is finished and steam is stopped instantly, the steam control device (6) for the steelmaking RH furnace instantly closes the regulating valve, when the pressure of the spherical heat accumulator (5) suddenly rises, the pressure signal and the steam regulating valve closing signal for the steelmaking RH furnace are remotely transmitted to the PLC Siemens control device (8), the PLC Siemens control device (8) sends a control instruction, the electric regulating valve in the auxiliary steam extraction control and protection device (4) of the steam turbine is slowly closed, and the pressure regulating valve in the low-pressure steam control device (7) of the steel enterprise is slowly opened to send qualified steam to the low-pressure pipe network (11);
d. when the steelmaking RH vacuum refining furnace needs to be in a standby state, the steam temperature and pressure signals in the steam control device (6) for the steelmaking RH furnace send control instructions by the remote PLC Siemens control device (8), the electric regulating valve in the steam turbine auxiliary steam extraction control and protection device (4) is slowly opened, the pressure regulating valve in the low-pressure steam control device (7) of the steel enterprise is slowly closed, when the steam pressure and the temperature of the spherical heat accumulator (5) meet the requirements, the steam pressure and the temperature in the spherical heat accumulator (5) feed back signals to the PLC Siemens control device (8), the PLC Siemens control device (8) sends refining agreement signals to the steam control device (6) for the steel-making RH furnace, when the formal refining signal sends out an opening signal of an adjusting valve in the PLC Siemens control device (8), simultaneously, closing a signal of a pressure regulating valve in a low-pressure steam control device (7) of the iron and steel enterprise;
e. when the steam turbine (1) is in an emergency stop state, a control device 505E of the steam turbine (1) sends an emergency stop instruction, a pneumatic quick closing valve, a hydraulic quick-cutting check valve, an electric regulating valve and an external electric valve in the steam turbine auxiliary steam extraction control and protection device (4) are quickly closed, a quick closing signal of the electric regulating valve is fed back to a PLC Siemens device (8), the PLC Siemens control device (8) sends a refining stop signal, and a regulating valve in a steam control device (6) for the steelmaking furnace is closed;
f. when the steam turbine (1) is shut down or overhauled, high-pressure superheated steam generated by a power station boiler generates qualified stable steam through the temperature reduction and pressure reduction device (3), when the steam pressure and the temperature sent to the spherical heat accumulator (5) meet requirements, steam pressure and temperature feedback signals in the spherical heat accumulator (5) are sent to the PLC Siemens control device (8), the PLC Siemens control device (8) sends a refining agreement signal to the steel-making RH furnace steam control device (6), when the refining agreement signal sends a regulating valve opening signal in the PLC Siemens control device (8), and simultaneously, a pressure regulating valve signal in the low-pressure steam control device (7) of a steel enterprise is closed.
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