CN113686191A - Automatic control method for heat exchange of blast furnace slag flushing water of iron and steel plant - Google Patents
Automatic control method for heat exchange of blast furnace slag flushing water of iron and steel plant Download PDFInfo
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- CN113686191A CN113686191A CN202110849103.5A CN202110849103A CN113686191A CN 113686191 A CN113686191 A CN 113686191A CN 202110849103 A CN202110849103 A CN 202110849103A CN 113686191 A CN113686191 A CN 113686191A
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- flushing water
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 294
- 239000002893 slag Substances 0.000 title claims abstract description 258
- 238000011010 flushing procedure Methods 0.000 title claims abstract description 252
- 238000000034 method Methods 0.000 title claims abstract description 32
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 27
- 239000010959 steel Substances 0.000 title claims abstract description 27
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title description 8
- 229910052742 iron Inorganic materials 0.000 title description 4
- 230000002159 abnormal effect Effects 0.000 claims description 5
- 230000008901 benefit Effects 0.000 abstract description 5
- 239000002699 waste material Substances 0.000 abstract description 5
- 239000013049 sediment Substances 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000012423 maintenance Methods 0.000 description 2
- 201000004569 Blindness Diseases 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/024—Methods of cooling or quenching molten slag with the direct use of steam or liquid coolants, e.g. water
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/08—Treatment of slags originating from iron or steel processes with energy recovery
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
An automatic control method for heat exchange of blast furnace slag flushing water in a steel plant comprises the following steps: acquiring a first operating parameter of a slag flushing water station and a first operating parameter of a heat exchange unit; judging whether a preset heat exchange condition is met or not according to the first operation parameter of the slag flushing water station and the first operation parameter of the heat exchange unit; if so, controlling the slag flushing water station and the heat exchange unit to perform heat exchange operation; if not, keeping the current state; acquiring a second operation parameter of the slag flushing water station and a second operation parameter of the heat exchange unit; judging whether a preset switching heat exchange condition is met or not according to the second operation parameter of the slag flushing water station and the second operation parameter of the heat exchange unit; if so, controlling the slag flushing water station and the heat exchange unit to stop heat exchange operation; if not, the current state is kept. The slag flushing water station valve can be scientifically started and stopped, the heat exchange device is scientifically loaded/unloaded, each valve of the slag flushing water is accurately controlled, waste of slag flushing water resources is reduced, and economic benefits of companies are increased.
Description
Technical Field
The application relates to the field of heat exchange of blast furnace slag flushing water of iron and steel plants, in particular to an automatic control method for heat exchange of blast furnace slag flushing water of iron and steel plants.
Background
In order to fully utilize the heat energy resource of the slag flushing water in the production process of the blast furnace of the steel plant, a group of slag flushing water heat exchange devices are matched near the blast furnace and used for heating nearby users in winter. The process characteristic of the slag flushing water heat exchange device is closely related to blast furnace production. Because of the characteristics of the production process of the blast furnace slag flushing water, the two slag flushing water stations carry out slag flushing operation at variable time, and the situation of simultaneous slag flushing exists.
The outlet and the return water inlet valve of the original slag flushing water heat exchange device are both manually operated, in order to maintain the slag water inlet temperature of the slag flushing heat exchange unit, an operator needs to roll two stations to operate a switch valve, the efficiency is low, the heat energy is not fully utilized, great energy waste is caused, and under the condition that two slag flushing water stations flush slag simultaneously, the operator can only operate according to experience, and great blindness exists. If the valve is not operated timely, the phenomenon of water leakage of the two slag flushing water stations can be caused, and the production of the blast furnace is influenced.
Disclosure of Invention
The application provides an automatic control method for heat exchange of blast furnace slag flushing water in a steel plant, which aims to solve the technical problems that an operator needs to roll two stations to operate a switch valve, the efficiency is low, the heat energy is not fully utilized, and great energy waste is caused.
The application provides an automatic control method for heat exchange of blast furnace slag flushing water in a steel plant, which comprises the following steps:
acquiring a first operating parameter of a slag flushing water station and a first operating parameter of a heat exchange unit;
judging whether a preset heat exchange condition is met or not according to the first operation parameter of the slag flushing water station and the first operation parameter of the heat exchange unit;
if so, controlling the slag flushing water station and the heat exchange unit to perform heat exchange operation;
if not, keeping the current state;
acquiring a second operation parameter of the slag flushing water station and a second operation parameter of the heat exchange unit;
judging whether a preset switching heat exchange condition is met or not according to the second operation parameter of the slag flushing water station and the second operation parameter of the heat exchange unit;
if so, controlling the slag flushing water station and the heat exchange unit to stop heat exchange operation;
if not, returning to the step of keeping the current state.
Preferably, the step of obtaining the first operating parameter of the slag flushing water station and the first operating parameter of the heat exchange unit comprises the following steps:
acquiring outlet pressures of all slag flushing water stations;
acquiring the outlet temperature of all the slag flushing water stations;
acquiring the states of all the slag flushing water station outlet valves and water return valves;
acquiring working conditions of all the slag flushing water stations;
acquiring the overhaul conditions of all the slag flushing water stations;
and acquiring the inlet pressure of each heat exchanger in the heat exchanger unit.
Preferably, the step of judging whether a preset heat exchange condition is met according to the first operating parameter of the slag flushing water station and the first operating parameter of the heat exchanger unit comprises the following steps:
judging whether the outlet pressure of the slag flushing water station is more than or equal to 0.1Mpa or not;
judging whether the temperature of an outlet of the slag flushing water station is more than or equal to 60 ℃;
judging whether the states of an outlet valve and a water return valve of the slag flushing water station are completely closed or not;
judging whether the working condition of the slag flushing water station is normal or not;
judging whether the overhaul condition of the slag flushing water station is in an overhauled state or not;
judging whether the inlet pressure of at least two heat exchangers in the heat exchange unit is less than or equal to 0.1 Mpa;
when all judgment results are yes, judging that a preset heat exchange condition is met; and when any judgment result is negative, judging that the preset heat exchange condition is not met.
Preferably, the step of controlling the slag flushing water station and the heat exchanger unit to perform heat exchange operation comprises the following steps:
opening a water return valve of the slag flushing water station;
controlling the heat exchanger unit to enter a loading state;
and opening an outlet valve of the slag flushing water station after the preset time.
Preferably, the step of obtaining the second operating parameter of the slag flushing water station and the second operating parameter of the heat exchanger unit comprises the following steps:
acquiring outlet pressures of all slag flushing water stations;
acquiring the outlet temperature of all the slag flushing water stations;
acquiring the states of all the slag flushing water station outlet valves and water return valves;
acquiring working conditions of all the slag flushing water stations;
acquiring the overhaul conditions of all the slag flushing water stations;
and acquiring the inlet pressure of each heat exchanger in the heat exchanger unit.
Preferably, the step of judging whether a preset switching heat exchange condition is met according to the second operation parameter of the slag flushing water station and the second operation parameter of the heat exchanger unit comprises the following steps:
judging whether the outlet pressure of the slag flushing water station is less than or equal to 0.1Mpa or not;
judging whether the temperature of an outlet of the slag flushing water station is less than or equal to 60 ℃;
judging whether the states of an outlet valve and a water return valve of the slag flushing water station are all opened or not;
judging whether the working condition of the slag flushing water station is abnormal or not;
judging whether the overhaul condition of the slag flushing water station is in an overhaul state or not;
judging whether the inlet pressure of at least two heat exchangers in the heat exchange unit is more than or equal to 0.1 Mpa;
when all judgment results are yes, judging that a preset switching heat exchange condition is met; and when any judgment result is negative, judging that the preset switching heat exchange condition is not met.
Preferably, the step of controlling the slag flushing water station and the heat exchanger unit to stop the heat exchange operation comprises the following steps:
closing a water return valve of the slag flushing water station;
controlling the heat exchanger unit to enter an unloading state;
and closing an outlet valve of the slag flushing water station after the preset time.
Preferably, before the obtaining of the first operating parameter of the slag flushing water station and the first operating parameter of the heat exchanger unit, the method further comprises the following steps:
acquiring first clock signals of all slag flushing water stations;
acquiring second clock signals of all heat exchangers in the heat exchanger unit;
determining whether the first clock signal is equal to the second clock signal;
if yes, keeping the current state;
if not, unifying the first clock signal and the second clock signal.
Preferably, the step of controlling the slag flushing water station and the heat exchanger unit to perform heat exchange operation comprises the following steps:
judging whether at least two slag flushing water stations meet preset heat exchange conditions;
if so, acquiring the weights of all the slag flushing water stations meeting the preset heat exchange conditions, and selecting the slag flushing water station with the largest weight and the heat exchange unit to perform heat exchange operation;
if not, controlling the only slag flushing water station meeting the preset heat exchange conditions and the heat exchanger unit to carry out heat exchange operation.
Preferably, the step of controlling the slag flushing water station and the heat exchanger unit to stop the heat exchange operation comprises the following steps:
judging whether at least two slag flushing water stations meet preset switching heat exchange conditions;
if so, acquiring the weights of all the slag flushing water stations meeting the preset switching heat exchange conditions, and selecting the slag flushing water station with the largest weight and the heat exchange unit to stop heat exchange operation;
if not, controlling the only slag flushing water station and the heat exchange unit meeting the preset switching heat exchange conditions to stop heat exchange operation.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
according to the automatic control method for the heat exchange of the blast furnace slag flushing water of the steel plant, the operating parameters of the slag flushing water station and the heat exchange unit are collected in real time, and the operating parameters are compared with the preset heat exchange conditions and the switching heat exchange conditions, so that the heat exchange is started or stopped, the valves of the slag flushing water station can be scientifically started and stopped, the heat exchange device can be scientifically heated or unloaded, the accurate control of the valves of the slag flushing water is realized, the waste of slag flushing water resources is reduced, and the heat energy resources of the slag flushing water are more fully utilized; meanwhile, the operation efficiency of the blast furnace slag flushing water station of the steel plant is improved, the management level of the steel plant is improved, and the economic benefit of a company is increased.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic flow chart of an automatic heat exchange control method for blast furnace slag flushing water of a steel plant according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a schematic flow chart of an automatic heat exchange control method for blast furnace slag flushing water of a steel plant according to an embodiment of the present application.
In the embodiment of the application, the application provides an automatic heat exchange control method for blast furnace slag flushing water of a steel plant, and the method comprises the following steps:
s1: acquiring a first operating parameter of a slag flushing water station and a first operating parameter of a heat exchange unit;
in this embodiment of the present application, the obtaining of the first operating parameter of the slag flushing water station and the first operating parameter of the heat exchanger set in step S1 includes:
acquiring outlet pressures of all slag flushing water stations;
acquiring the outlet temperature of all the slag flushing water stations;
acquiring the states of all the slag flushing water station outlet valves and water return valves;
acquiring working conditions of all the slag flushing water stations;
acquiring the overhaul conditions of all the slag flushing water stations;
and acquiring the inlet pressure of each heat exchanger in the heat exchanger unit.
In this application embodiment, when obtaining the first operating parameter of towards sediment water station and the first operating parameter of heat exchanger group, specifically, the operating parameter of towards sediment water station includes: dash sediment water station outlet pressure, outlet temperature, outlet valve state, return water valve state, operating mode condition, the maintenance condition, heat exchanger unit's operating parameter includes: heat exchanger inlet pressure. And E, the parameters can be acquired by detecting through a sensor.
S2: judging whether a preset heat exchange condition is met or not according to the first operation parameter of the slag flushing water station and the first operation parameter of the heat exchange unit;
in this embodiment of the present application, the step S2 of determining whether a preset heat exchange condition is satisfied according to the first operating parameter of the slag flushing water station and the first operating parameter of the heat exchanger set includes the steps of:
judging whether the outlet pressure of the slag flushing water station is more than or equal to 0.1Mpa or not;
judging whether the temperature of an outlet of the slag flushing water station is more than or equal to 60 ℃;
judging whether the states of an outlet valve and a water return valve of the slag flushing water station are completely closed or not;
judging whether the working condition of the slag flushing water station is normal or not;
judging whether the overhaul condition of the slag flushing water station is in an overhauled state or not;
judging whether the inlet pressure of at least two heat exchangers in the heat exchange unit is less than or equal to 0.1 Mpa;
when all judgment results are yes, judging that a preset heat exchange condition is met; and when any judgment result is negative, judging that the preset heat exchange condition is not met.
In the embodiment of the present application, the preset heat exchange conditions are as follows: the outlet pressure of the slag flushing water station is more than or equal to 0.1Mpa, the outlet temperature of the slag flushing water station is more than or equal to 60 ℃, the states of an outlet valve and a return valve of the slag flushing water station are all closed, the working condition of the slag flushing water station is normal, the overhaul condition of the slag flushing water station is an overhauled state, and the inlet pressure of at least two heat exchangers in the heat exchange unit is less than or equal to 0.1 Mpa; and when all the conditions are met, judging that the first operation parameter of the slag flushing water station and the first operation parameter of the heat exchange unit meet the preset heat exchange condition.
S3: if so, controlling the slag flushing water station and the heat exchange unit to perform heat exchange operation;
in this embodiment of the application, the step of controlling the slag flushing water station and the heat exchanger set to perform the heat exchange operation in step S3 includes the steps of:
opening a water return valve of the slag flushing water station;
controlling the heat exchanger unit to enter a loading state;
and opening an outlet valve of the slag flushing water station after the preset time.
In this application embodiment, when judging when satisfying the preset heat transfer condition, then control towards sediment water station and heat exchanger unit and carry out the heat transfer operation, concrete step is: opening a water return valve of the slag flushing water station, and simultaneously controlling the heat exchange unit to enter a loading state; and opening an outlet valve of the slag flushing water station after the preset time, and then carrying out heat exchange operation on the slag flushing water station and the heat exchange unit.
S4: if not, keeping the current state;
in the embodiment of the application, when the preset heat exchange condition is judged not to be met, the slag flushing water station and the heat exchange unit can be operated in the current state.
S5: acquiring a second operation parameter of the slag flushing water station and a second operation parameter of the heat exchange unit;
in this embodiment of the present application, the obtaining of the second operating parameter of the slag flushing water station and the second operating parameter of the heat exchanger set in step S5 includes:
acquiring outlet pressures of all slag flushing water stations;
acquiring the outlet temperature of all the slag flushing water stations;
acquiring the states of all the slag flushing water station outlet valves and water return valves;
acquiring working conditions of all the slag flushing water stations;
acquiring the overhaul conditions of all the slag flushing water stations;
and acquiring the inlet pressure of each heat exchanger in the heat exchanger unit.
In the embodiment of the application, the second operation parameter of the slag water station is the same as the first operation parameter of the slag water station, and the second operation parameter of the heat exchange unit is the same as the first operation parameter of the heat exchange unit, so that the steps of obtaining the second operation parameter of the slag flushing water station and the second operation parameter of the heat exchange unit are not repeated. In other embodiments, the second operating parameter of the slag water station and the first operating parameter of the slag water station may be different, and the second operating parameter of the heat exchanger unit and the first operating parameter of the heat exchanger unit may be different.
S6: judging whether a preset switching heat exchange condition is met or not according to the second operation parameter of the slag flushing water station and the second operation parameter of the heat exchange unit;
in this embodiment of the present application, the step S6 of determining whether the preset switching heat exchange condition is satisfied according to the second operating parameter of the slag flushing water station and the second operating parameter of the heat exchanger set includes the steps of:
judging whether the outlet pressure of the slag flushing water station is less than or equal to 0.1Mpa or not;
judging whether the temperature of an outlet of the slag flushing water station is less than or equal to 60 ℃;
judging whether the states of an outlet valve and a water return valve of the slag flushing water station are all opened or not;
judging whether the working condition of the slag flushing water station is abnormal or not;
judging whether the overhaul condition of the slag flushing water station is in an overhaul state or not;
judging whether the inlet pressure of at least two heat exchangers in the heat exchange unit is more than or equal to 0.1 Mpa;
when all judgment results are yes, judging that a preset switching heat exchange condition is met; and when any judgment result is negative, judging that the preset switching heat exchange condition is not met.
In the embodiment of the present application, the preset switching heat exchange conditions are as follows: the outlet pressure of the slag flushing water station is less than or equal to 0.1Mpa, the outlet temperature of the slag flushing water station is less than or equal to 60 ℃, the states of an outlet valve and a return valve of the slag flushing water station are all opened, the working condition of the slag flushing water station is abnormal, the overhaul condition of the slag flushing water station is an overhaul state, and the inlet pressure of at least two heat exchangers in the heat exchange unit is greater than or equal to 0.1 Mpa; and when all the conditions are met, judging that the second operation parameter of the slag flushing water station and the second operation parameter of the heat exchange unit meet the preset switching heat exchange condition.
S7: if so, controlling the slag flushing water station and the heat exchange unit to stop heat exchange operation;
in this embodiment of the present application, the step of controlling the slag flushing water station and the heat exchanger set to stop the heat exchange operation in step S7 includes the steps of:
closing a water return valve of the slag flushing water station;
controlling the heat exchanger unit to enter an unloading state;
and closing an outlet valve of the slag flushing water station after the preset time.
In this application embodiment, when judging when satisfying and predetermineeing the switching heat transfer condition, then control towards sediment water station and heat exchanger unit and stop the heat transfer operation, concrete step is: closing a water return valve of the slag flushing water station, and simultaneously controlling the heat exchange unit to enter an unloading state; and closing an outlet valve of the slag flushing water station after the preset time, and then stopping the heat exchange operation of the slag flushing water station and the heat exchange unit.
S8: if not, returning to the step of keeping the current state.
In the embodiment of the application, when the preset switching heat exchange condition is judged not to be met, the slag flushing water station and the heat exchange unit can be kept running in the current state, and the heat exchange operation is continued.
In this embodiment of the present application, before obtaining the first operating parameter of the slag flushing water station and the first operating parameter of the heat exchanger set in step S1, the method further includes the steps of:
acquiring first clock signals of all slag flushing water stations;
acquiring second clock signals of all heat exchangers in the heat exchanger unit;
determining whether the first clock signal is equal to the second clock signal;
if yes, keeping the current state;
if not, unifying the first clock signal and the second clock signal.
In the embodiment of the present application, when clock unification of each device needs to be completed before acquiring the first operating parameter of the slag flushing water station and the first operating parameter of the heat exchanger unit, in the embodiment of the present application, an energy timing system may be used to time each device, where the temperature, the pressure, the valve state, and the like are all based on an SNTP clock signal provided by the energy timing system, and the operation time of opening/closing the valve, loading/unloading the unit, and the like is all taken from an IRIG-B clock signal provided by the energy timing system.
In this embodiment of the application, the step of controlling the slag flushing water station and the heat exchanger set to perform the heat exchange operation in step S3 includes the steps of:
judging whether at least two slag flushing water stations meet preset heat exchange conditions;
if so, acquiring the weights of all the slag flushing water stations meeting the preset heat exchange conditions, and selecting the slag flushing water station with the largest weight and the heat exchange unit to perform heat exchange operation;
if not, controlling the only slag flushing water station meeting the preset heat exchange conditions and the heat exchanger unit to carry out heat exchange operation.
In this application embodiment, when having two at least towards the sediment water station and all satisfying the heat transfer condition of predetermineeing, then these towards the sediment water station all can carry out the heat transfer operation with heat exchanger unit according to aforementioned step, but according to actual conditions, towards the sediment heat transfer and must go on in turn, otherwise can cause the phenomenon of cluster water between a plurality of towards the sediment water station, can cause the influence to blast furnace production. Therefore, priority setting needs to be carried out on heat exchange operation of the multiple slag flushing water stations, specifically, the weights of the slag flushing water stations can be set, and when the multiple slag flushing water stations meet heat exchange conditions, heat exchange operation can be carried out according to the sequence from high to low according to the weight.
In this embodiment of the present application, the step of controlling the slag flushing water station and the heat exchanger set to stop the heat exchange operation in step S7 includes the steps of:
judging whether at least two slag flushing water stations meet preset switching heat exchange conditions;
if so, acquiring the weights of all the slag flushing water stations meeting the preset switching heat exchange conditions, and selecting the slag flushing water station with the largest weight and the heat exchange unit to stop heat exchange operation;
if not, controlling the only slag flushing water station and the heat exchange unit meeting the preset switching heat exchange conditions to stop heat exchange operation.
In this application embodiment, when having two at least towards the sediment water station and all satisfying to predetermine and switching the heat transfer condition, then these towards the sediment water station all can switch the heat transfer operation with heat exchanger unit according to aforementioned step, but according to actual conditions, towards the sediment and switch the heat transfer and must go on in turn, otherwise can cause the phenomenon of running water between a plurality of towards the sediment water station, can cause the influence to blast furnace production. Therefore, priority setting needs to be carried out on heat exchange stopping operations of the multiple slag flushing water stations, specifically, the weights of the slag flushing water stations can be set, and when the multiple slag flushing water stations meet the heat exchange switching condition, the heat exchange operations can be stopped according to the sequence from high to low according to the weight.
The present application is described in detail below with specific examples.
The existing No. 1 slag flushing water station and the heat exchange unit are provided with a No. 1 heat exchanger, a No. 2 heat exchanger and a No. 3 heat exchanger, the No. 1 slag flushing water station is connected with the heat exchange unit in a conventional mode, and heat exchange operation can be carried out between the slag flushing water station and the heat exchange unit.
Firstly, reading the outlet pressure, the temperature and the inlet pressure of a heat exchange unit of a No. 1 slag flushing water station, if the outlet temperature of the No. 1 slag flushing water station is more than or equal to 60 ℃, the outlet pressure of the No. 1 is more than or equal to 0.1MPa, and the inlet pressure of the heat exchange unit is less than or equal to 0.1MPa (the two heat exchangers are required to reach set conditions simultaneously), and the outlet valve and the water return valve of the No. 1 slag flushing water station are both in a closed state, the working condition of the No. 1 slag flushing water station is normal, the No. 1 slag flushing water station is not overhauled, opening the water return valve matched with the No. 1 slag flushing water station, simultaneously starting loading the heat exchange unit to enter a working state, opening the outlet valve of the No. 1 slag flushing water station after 1 minute, and performing heat exchange operation by utilizing the No. 1 slag flushing water station and the heat exchange unit.
And then reading the outlet pressure and temperature of the No. 1 slag flushing water station and the inlet pressure of the heat exchange unit at intervals of set time, if the outlet temperature of the No. 1 slag flushing water station is less than or equal to 60 ℃, the outlet pressure of the No. 1 slag flushing water station is less than or equal to 0.1Mpa, and the backwater pressure of the heat exchange unit is more than or equal to 0.1Mpa (the two heat exchangers are required to reach set conditions simultaneously), and the water outlet valve and the backwater valve of the No. 1 slag flushing water station are in an open state, the working condition of the No. 1 slag flushing water station is abnormal, the No. 1 slag flushing water station is in maintenance, the backwater valve of the No. 1 slag flushing water station is closed, the heat exchange unit is controlled to enter an unloading state, the outlet valve of the No. 1 slag flushing water station is closed after 1 minute, and the heat exchange operation between the No. 1 slag flushing water station and the heat exchange unit is stopped.
When a No. 2 slag flushing water station is arranged, the working condition is the same as that of the No. 1 slag flushing water station. Meanwhile, because the heat exchange between the two slag flushing water stations and the heat exchanger unit can not be carried out simultaneously, otherwise, the phenomenon of water mixing can be caused, and great influence is caused on the production of the blast furnace, so that the weight between the two slag flushing water stations needs to be set in a high-low mode, and when the two slag flushing water stations meet the preset heat exchange condition or switch the heat exchange condition, the slag flushing water station with the larger weight needs to be selected to carry out heat exchange operation or stop heat exchange.
According to the automatic control method for the heat exchange of the blast furnace slag flushing water of the steel plant, the operating parameters of the slag flushing water station and the heat exchange unit are collected in real time, and the operating parameters are compared with the preset heat exchange conditions and the switching heat exchange conditions, so that the heat exchange is started or stopped, the valves of the slag flushing water station can be scientifically started and stopped, the heat exchange device can be scientifically heated or unloaded, the accurate control of the valves of the slag flushing water is realized, the waste of slag flushing water resources is reduced, and the heat energy resources of the slag flushing water are more fully utilized; meanwhile, the operation efficiency of the blast furnace slag flushing water station of the steel plant is improved, the management level of the steel plant is improved, and the economic benefit of a company is increased.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An automatic control method for heat exchange of blast furnace slag flushing water in a steel plant is characterized by comprising the following steps:
acquiring a first operating parameter of a slag flushing water station and a first operating parameter of a heat exchange unit;
judging whether a preset heat exchange condition is met or not according to the first operation parameter of the slag flushing water station and the first operation parameter of the heat exchange unit;
if so, controlling the slag flushing water station and the heat exchange unit to perform heat exchange operation;
if not, keeping the current state;
acquiring a second operation parameter of the slag flushing water station and a second operation parameter of the heat exchange unit;
judging whether a preset switching heat exchange condition is met or not according to the second operation parameter of the slag flushing water station and the second operation parameter of the heat exchange unit;
if so, controlling the slag flushing water station and the heat exchange unit to stop heat exchange operation;
if not, returning to the step of keeping the current state.
2. The automatic control method for the heat exchange of the slag flushing water of the blast furnace of the steel plant according to claim 1, wherein the obtaining of the first operating parameter of the slag flushing water station and the first operating parameter of the heat exchange unit comprises the steps of:
acquiring outlet pressures of all slag flushing water stations;
acquiring the outlet temperature of all the slag flushing water stations;
acquiring the states of all the slag flushing water station outlet valves and water return valves;
acquiring working conditions of all the slag flushing water stations;
acquiring the overhaul conditions of all the slag flushing water stations;
and acquiring the inlet pressure of each heat exchanger in the heat exchanger unit.
3. The automatic control method for the heat exchange of the slag flushing water of the blast furnace of the steel plant according to claim 1, wherein the step of judging whether the preset heat exchange condition is met according to the first operation parameter of the slag flushing water station and the first operation parameter of the heat exchange unit comprises the steps of:
judging whether the outlet pressure of the slag flushing water station is more than or equal to 0.1Mpa or not;
judging whether the temperature of an outlet of the slag flushing water station is more than or equal to 60 ℃;
judging whether the states of an outlet valve and a water return valve of the slag flushing water station are completely closed or not;
judging whether the working condition of the slag flushing water station is normal or not;
judging whether the overhaul condition of the slag flushing water station is in an overhauled state or not;
judging whether the inlet pressure of at least two heat exchangers in the heat exchange unit is less than or equal to 0.1 Mpa;
when all judgment results are yes, judging that a preset heat exchange condition is met; and when any judgment result is negative, judging that the preset heat exchange condition is not met.
4. The automatic control method for the heat exchange of the slag flushing water of the blast furnace of the steel plant according to claim 1, wherein the step of controlling the slag flushing water station and the heat exchange unit to perform the heat exchange operation comprises the following steps:
opening a water return valve of the slag flushing water station;
controlling the heat exchanger unit to enter a loading state;
and opening an outlet valve of the slag flushing water station after the preset time.
5. The automatic control method for the heat exchange of the slag flushing water of the blast furnace of the steel plant according to claim 1, wherein the step of obtaining the second operation parameter of the slag flushing water station and the second operation parameter of the heat exchange unit comprises the steps of:
acquiring outlet pressures of all slag flushing water stations;
acquiring the outlet temperature of all the slag flushing water stations;
acquiring the states of all the slag flushing water station outlet valves and water return valves;
acquiring working conditions of all the slag flushing water stations;
acquiring the overhaul conditions of all the slag flushing water stations;
and acquiring the inlet pressure of each heat exchanger in the heat exchanger unit.
6. The automatic control method for the heat exchange of the slag flushing water of the blast furnace of the steel plant according to claim 1, wherein the step of judging whether the preset switching heat exchange condition is met according to the second operation parameter of the slag flushing water station and the second operation parameter of the heat exchanger unit comprises the steps of:
judging whether the outlet pressure of the slag flushing water station is less than or equal to 0.1Mpa or not;
judging whether the temperature of an outlet of the slag flushing water station is less than or equal to 60 ℃;
judging whether the states of an outlet valve and a water return valve of the slag flushing water station are all opened or not;
judging whether the working condition of the slag flushing water station is abnormal or not;
judging whether the overhaul condition of the slag flushing water station is in an overhaul state or not;
judging whether the inlet pressure of at least two heat exchangers in the heat exchange unit is more than or equal to 0.1 Mpa;
when all judgment results are yes, judging that a preset switching heat exchange condition is met; and when any judgment result is negative, judging that the preset switching heat exchange condition is not met.
7. The automatic control method for the heat exchange of the blast furnace slag flushing water of the steel plant according to claim 1, wherein the step of controlling the slag flushing water station and the heat exchange unit to stop the heat exchange operation comprises the steps of:
closing a water return valve of the slag flushing water station;
controlling the heat exchanger unit to enter an unloading state;
and closing an outlet valve of the slag flushing water station after the preset time.
8. The automatic control method for the heat exchange of the slag flushing water of the blast furnace of the steel plant according to claim 1, wherein before the obtaining of the first operating parameter of the slag flushing water station and the first operating parameter of the heat exchanger set, the method further comprises the following steps:
acquiring first clock signals of all slag flushing water stations;
acquiring second clock signals of all heat exchangers in the heat exchanger unit;
determining whether the first clock signal is equal to the second clock signal;
if yes, keeping the current state;
if not, unifying the first clock signal and the second clock signal.
9. The automatic control method for the heat exchange of the slag flushing water of the blast furnace of the steel plant according to claim 1, wherein the step of controlling the slag flushing water station and the heat exchange unit to perform the heat exchange operation comprises the following steps:
judging whether at least two slag flushing water stations meet preset heat exchange conditions;
if so, acquiring the weights of all the slag flushing water stations meeting the preset heat exchange conditions, and selecting the slag flushing water station with the largest weight and the heat exchange unit to perform heat exchange operation;
if not, controlling the only slag flushing water station meeting the preset heat exchange conditions and the heat exchanger unit to carry out heat exchange operation.
10. The automatic control method for the heat exchange of the blast furnace slag flushing water of the steel plant according to claim 1, wherein the step of controlling the slag flushing water station and the heat exchange unit to stop the heat exchange operation comprises the steps of:
judging whether at least two slag flushing water stations meet preset switching heat exchange conditions;
if so, acquiring the weights of all the slag flushing water stations meeting the preset switching heat exchange conditions, and selecting the slag flushing water station with the largest weight and the heat exchange unit to stop heat exchange operation;
if not, controlling the only slag flushing water station and the heat exchange unit meeting the preset switching heat exchange conditions to stop heat exchange operation.
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