CN109236693B - Control method of air blast system of front oxygen-enriched blast furnace - Google Patents
Control method of air blast system of front oxygen-enriched blast furnace Download PDFInfo
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- CN109236693B CN109236693B CN201811201456.9A CN201811201456A CN109236693B CN 109236693 B CN109236693 B CN 109236693B CN 201811201456 A CN201811201456 A CN 201811201456A CN 109236693 B CN109236693 B CN 109236693B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/003—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by throttling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/002—Details, component parts, or accessories especially adapted for elastic fluid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
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- General Engineering & Computer Science (AREA)
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- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
- Blast Furnaces (AREA)
Abstract
The invention provides a control method of a front oxygen-enriched blast furnace blast system, wherein a blower of the front oxygen-enriched blast furnace blast system is communicated with an air inlet pipeline and an air outlet pipeline, gas is sucked into the blower through the air inlet pipeline, is pressurized by the blower and then is sent into a blast furnace through the air outlet pipeline, the air inlet end of a recirculation pipeline is communicated with the air outlet pipeline, the air outlet end of the recirculation pipeline is communicated with the air inlet pipeline, and the recirculation pipeline is connected with a first regulating valve in series, the control method comprises the following steps: acquiring operation parameters of the air blower, and judging whether the operation parameters meet a first preset condition; and when the operation parameters meet a first preset condition, controlling the first regulating valve to open. The control method of the air blast system of the oxygen-enriched blast furnace in front of the machine, provided by the invention, has more flexible adjustment on the air outlet pressure and does not influence the normal production. Meanwhile, the oxygen flowing into the environment through the anti-surge valve can be reduced, the resource waste is reduced, the production cost is reduced, and the blower system of the oxygen-enriched blast furnace in front of the blast furnace is more energy-saving. The oxygen enrichment rate of the blast furnace which is convenient for air intake can be further improved.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a control method of a blast system of a front oxygen-enriched blast furnace.
Background
Blast furnace oxygen enrichment is one of the main ways of improving smelting strength in modern blast furnace production. The method is to add oxygen into blast furnace blast air to make the oxygen content of blast air exceed the oxygen content of atmosphere. Theoretically, the amount of iron produced by the blast furnace increases by 4.76% for every 1% increase in oxygen content in the blast. The oxygen enrichment of the blast furnace can also improve the coal ratio and reduce the coke ratio, thereby playing the role of reducing the production cost of the blast furnace. In the statistical data of each year, the average oxygen enrichment rate of blast furnaces with different volume levels in China is improved year by year, and the oxygen enrichment rate of the blast furnace with advanced main technical and economic indexes is improved to 11 percent.
In the prior art, the air quantity sent by the blower is gradually reduced along with the gradual increase of the smelting intensity and the oxygen enrichment rate of the blast furnace in the operation process of the blower. The running working condition of the blower deviates from the original design working condition due to the reduction of the air output of the blower, and the running efficiency of the blower is reduced; the blower runs close to an anti-surge line, the anti-surge valve has to be opened for a long time to release air, and part of compressed cold air and oxygen are released into the atmosphere, so that waste is caused, and the further improvement of the oxygen enrichment rate is restricted.
In order to improve the efficiency of the air blower and avoid the waste of oxygen diffusion, the structure of the air blower body needs to be modified, but the modification needs to redesign and adjust the structure, the rotor power, the strength and other aspects of the air blower, the cost is high, the period is long, and the normal production of the blast furnace is influenced.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
In view of the above, the present invention provides a method for controlling a blower system of a front-end oxygen-rich blast furnace.
In order to achieve the purpose, the technical scheme of the invention provides a control method of a front oxygen-enriched blast furnace air-blowing system, wherein an air blower of the front oxygen-enriched blast furnace air-blowing system is communicated with an air inlet pipeline and an air outlet pipeline, air is sucked into the air blower through the air inlet pipeline, is pressurized by the air blower and then is sent into a blast furnace through the air outlet pipeline, the air inlet end of a recirculation pipeline is communicated with the air outlet pipeline, the air outlet end of the recirculation pipeline is communicated with the air inlet pipeline, and the recirculation pipeline is connected with a first regulating valve in series, the control method comprises the following: acquiring operation parameters of the air blower, and judging whether the operation parameters meet a first preset condition; and when the operation parameters meet a first preset condition, controlling the first regulating valve to open.
In the scheme, when the blast system of the oxygen-enriched blast furnace in front of the blast furnace runs, firstly, the running parameters of the blast furnace are obtained, and whether the running parameters meet a first preset condition is judged; when the operation parameters meet a first preset condition, the working point of the air blower deviates to the surge line at the moment, the first regulating valve is controlled to be opened, the gas containing oxygen in the gas outlet pipeline flows into the air blower again through the recirculation pipeline, the air outlet quantity of the air blower is the sum of the air inlet quantity of the blast furnace and the air inlet quantity of the recirculation pipeline at the moment, and the working point of the air blower is far away from a surge area through the regulation of the regulating valve of the recirculation pipeline.
Through this scheme, can adjust the aperture of governing valve in real time according to the change of blast furnace intake, adjust more in a flexible way to do not influence normal production. Meanwhile, oxygen flowing into the environment through the anti-surge valve can be reduced, the waste of resources is reduced, the production cost is reduced, and the front oxygen-enriched blast furnace blast system is more energy-saving. The recycling pipeline is arranged in the front oxygen-enriched blast furnace blast system, so that the oxygen enrichment rate of blast furnace inlet air can be further improved.
It should also be pointed out that in the scheme, only the recirculation pipeline is needed to be arranged on the air inlet pipeline and the air outlet pipeline, so that the workload is less when the blower system of the oxygen-enriched blast furnace in front of the blast furnace is modified, the cost is lower, the period is shorter, and the influence on the production of the blast furnace is less.
In the above technical solution, preferably, acquiring an operating parameter of the blower specifically includes: acquiring throat pressure difference and air outlet pressure of the air blower; judging whether the operation parameters meet a first preset condition, specifically comprising: obtaining a prestored surge line S0, and drawing an anti-surge line S1 and a preset line S2 according to the surge line, wherein the standard throat pressure difference and the standard air outlet pressure of the anti-surge line S1 are 92% -95% of the standard throat pressure difference and the standard air outlet pressure of the surge line S0, and the standard throat pressure difference and the standard air outlet pressure of the preset line S2 are 90% -92% of the standard throat pressure difference and the standard air outlet pressure of the anti-surge line S1; and judging whether the throat pressure difference and the outlet air pressure of the blower touch a pre-regulation line S2.
In the above technical solution, preferably, the method further includes: when the throat pressure difference and the air outlet pressure of the blower touch the pre-adjusting line S2, the stationary blade angle of the blower is adjusted to reduce the air outlet quantity of the blower.
In the above technical solution, preferably, the air blast system of the pre-machine oxygen-enriched blast furnace further includes an anti-surge valve communicated with the air outlet pipeline, and the control method further includes: and when the throat pressure difference and the outlet air pressure of the blower touch the anti-surge line S1, controlling the anti-surge valve to open.
In the above technical solution, preferably, the pre-machine oxygen-enriched blast furnace blower system further comprises an oxygen pipeline, and the oxygen pipeline is connected in series with the first quick shut-off valve and the third quick shut-off valve; the air blast system of the oxygen-enriched blast furnace in front of the machine also comprises a nitrogen pipeline communicated with the oxygen pipeline, the nitrogen pipeline is provided with a second quick cut-off valve, and the control method also comprises the following steps; when the throat pressure difference and the outlet air pressure of the blower touch the anti-surge line S1, the first quick cut-off valve is controlled to be closed, and the third quick cut-off valve and the second quick cut-off valve are controlled to be opened.
In the above technical solution, preferably, the recirculation line is further provided with a cooler, and the control method further includes: and when the operation parameters meet a first preset condition, starting the cooler.
In the above technical solution, preferably, the method further includes: acquiring the air outlet pressure of the air blower, and judging whether the air outlet pressure is smaller than a preset threshold value or not; and when the air outlet pressure is smaller than a preset threshold value, controlling the regulating valve to be closed.
In the above technical scheme, preferably, when the outlet air pressure is less than the preset threshold value after the regulating valve is closed for the preset time, the angle of the stationary blade of the blower is regulated to increase the air output of the blower.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic flow diagram of a method of controlling a pre-machine oxygen-enriched blast furnace blower system according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a pre-aircraft oxygen-enriched blast furnace blower system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a surge curve according to an embodiment of the present invention.
Wherein, the correspondence between the reference numbers and the names of the components in fig. 2 is:
1 air inlet pipeline, 2 air outlet pipeline, 3 blower, 4 blast furnace, 5 recirculation pipeline, 51 first regulating valve, 52 cooler, 6 anti-surge valve, 7 discharge muffler, 8 oxygen pipeline, 81 second regulating valve, 82 first quick cut-off valve, 83 third quick cut-off valve, 9 nitrogen pipeline, 91 second quick cut-off valve, 10 anti-surge control unit, 11 differential pressure transmitter, 12 first pressure transmitter, 13 equal flow/equal pressure control unit, 14 temperature transmitter, 15 first flow transmitter, 16 second pressure transmitter, 17 second flow transmitter.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Some embodiments according to the invention are described below with reference to fig. 1 to 3.
As shown in fig. 1 and fig. 2, an embodiment of the present invention provides a control method of a blower system of a front oxygen-rich blast furnace, in which a blower 3 of the blower system of the front oxygen-rich blast furnace is communicated with an air inlet pipeline 1 and an air outlet pipeline 2, air is sucked into the blower 3 through the air inlet pipeline 1, is pressurized by the blower 3 and then is sent into a blast furnace 4 through the air outlet pipeline 2, an air inlet end of a recirculation pipeline 5 is communicated with the air outlet pipeline 2, an air outlet end of the recirculation pipeline 5 is communicated with the air inlet pipeline 1, the recirculation pipeline 5 is connected in series with a first regulating valve 51, and the control method comprises: acquiring operation parameters of the blower 3, and judging whether the operation parameters meet a first preset condition; when the operation parameter meets the first preset condition, the first regulating valve 51 is controlled to be opened.
In the scheme, when the blast system of the oxygen-enriched blast furnace in front of the blast furnace runs, firstly, the running parameters of the blast furnace 3 are obtained, and whether the running parameters meet a first preset condition is judged; when the operation parameters meet a first preset condition, the working point of the air blower 3 deviates to the surge line, the first regulating valve 51 is controlled to be opened, the recirculation pipeline 5 enables the gas containing oxygen in the gas outlet pipeline 2 to flow into the air blower 3 again through the recirculation pipeline 5, the air outlet quantity of the air blower 3 is the sum of the air inlet quantity of the blast furnace 4 and the air inlet quantity of the recirculation pipeline 5, and the working point of the air blower 3 is far away from a surge area through the regulation of the recirculation pipeline 5.
Through this scheme, can adjust the aperture of governing valve in real time according to the change of 4 intake of blast furnace, adjust more in a flexible way to do not influence normal production. Meanwhile, the oxygen flowing into the environment through the anti-surge valve 6 can be reduced, the waste of resources is reduced, the production cost is reduced, and the blower system of the oxygen-enriched blast furnace in front of the blast furnace is more energy-saving. The recycling pipeline 5 is arranged in the blast system of the front oxygen-enriched blast furnace, so that the oxygen enrichment rate of the blast furnace 4 can be further improved.
It should also be pointed out that in the scheme, only the air inlet pipeline 1 and the air outlet pipeline 2 are needed to be provided with the recirculation pipeline 5, so that the workload is less when the blast system of the oxygen-enriched blast furnace in front of the blast furnace is modified, the cost is lower, the period is shorter, and the influence on the production of the blast furnace 4 is less.
As shown in fig. 1 to 3, in the above embodiment, preferably, the acquiring of the operating parameters of the blower 3 specifically includes: acquiring the throat pressure difference and the air outlet pressure of the blower 3; judging whether the operation parameters meet a first preset condition, specifically comprising: obtaining a prestored surge line S0, and drawing an anti-surge line S1 and a preset line S2 according to the surge line, wherein the standard throat pressure difference and the standard air outlet pressure of the anti-surge line S1 are 92% -95% of the standard throat pressure difference and the standard air outlet pressure of the surge line S0, and the standard throat pressure difference and the standard air outlet pressure of the preset line S2 are 90% -92% of the standard throat pressure difference and the standard air outlet pressure of the anti-surge line S1; and judging whether the throat pressure difference and the outlet air pressure of the blower 3 contact the pre-regulation line S2.
When the throat pressure difference and the outlet air pressure of the blower 3 touch the pre-regulation line S2, the operating point of the blower 3 is shifted toward the surge line. The first regulating valve 51 is controlled to be opened, the recirculation pipeline 5 enables the gas containing oxygen in the gas outlet pipeline 2 to flow into the blower 3 again through the recirculation pipeline 5, the air outlet quantity of the blower 3 is the sum of the air inlet quantity of the blast furnace 4 and the air inlet quantity of the recirculation pipeline 5, and the working point of the blower 3 is far away from the surge area through the regulation of the recirculation pipeline 5.
Wherein, preferably, after the first regulating valve 51 is opened, it further includes: the inlet pressure of the blast furnace 4 is obtained, and when the inlet pressure of the blast furnace 4 is gradually reduced, the opening degree of the first regulating valve 51 is reduced, so that the outlet pressure of the blower 3 is increased, and the inlet pressure of the blast furnace 4 is increased. When the intake pressure of the blast furnace 4 is gradually increased, the opening degree of the first regulating valve 51 is increased so that the outlet air pressure of the blower 3 is reduced and the intake pressure of the blast furnace 4 is reduced. In this embodiment, the opening of the first regulating valve 51 is adjusted according to the intake pressure of the blast furnace 4, so that the outlet pressure can be more flexibly regulated.
As shown in fig. 1 to 3, in any of the above embodiments, preferably, the method further includes: when the throat pressure difference and the outlet air pressure of the blower 3 touch the pre-adjustment line S2, the stationary blade angle of the blower 3 is adjusted to reduce the air outlet volume of the blower 3.
In the present embodiment, when the throat pressure difference and the outlet air pressure of the blower 3 touch the pre-adjustment line S2, the operating point of the blower 3 shifts toward the surge line. The angle of the fixed blade of the air blower 3 is adjusted, the pressure difference between the air inlet and the air outlet of the air blower 3 is reduced, the air outlet pressure of the air blower 3 is further reduced, and the working point of the air blower 3 is far away from a surge area.
In any of the above embodiments, as shown in fig. 1 to 3, preferably, the oxygen-enriched blast furnace blower system further comprises an anti-surge valve 6 communicating with the outlet pipe 2, and the control method further comprises: when the throat pressure difference and the outlet air pressure of the blower 3 touch the anti-surge line S1, the anti-surge valve 6 is controlled to be opened.
In the scheme, when the throat pressure difference and the outlet air pressure of the air blower 3 touch the anti-surge line S1, the first regulating valve 51 is out of work at the moment, and the working point of the air blower 3 is closer to the anti-surge line, and at the moment, the anti-surge valve 6 is opened to quickly reduce the outlet air pressure, so that the working point of the air blower 3 is quickly far away from a surge area.
In any of the above embodiments, as shown in fig. 1 to 3, preferably, the oxygen-enriched blast furnace blower system further comprises an oxygen pipeline 8, the oxygen pipeline 8 is connected in series with the first quick shut-off valve 82, and the control method further comprises; when the throat pressure difference and the outlet air pressure of the blower 3 reach the surge preventing line S1, the first quick cut valve 82 is closed.
In the scheme, when the throat pressure difference and the air outlet pressure of the air blower 3 touch the anti-surge line S1, the first quick cut-off valve 82 is controlled to be closed, the oxygen enrichment rate in the air inlet pipeline 1 and the air outlet pipeline 2 is reduced, the air inlet amount of the blast furnace 4 can be properly increased, the air outlet pressure of the air blower 3 is further reduced, and the working point of the air blower 3 is far away from the surge line.
Further, preferably, an oxygen concentration measuring instrument is arranged on one side of the air inlet pipeline 1 close to the blower 3, a signal detected by the oxygen concentration measuring instrument is obtained and determined according to the received signal, and the opening degree of the second regulating valve 81 is reduced when the oxygen enrichment rate is higher than a preset range; the opening degree of the second regulating valve 81 is increased when the oxygen enrichment ratio is lower than the preset range. By the scheme, the oxygen enrichment rate of the front oxygen-enriched blast furnace blast system is maintained within a preset range.
In any of the above embodiments, as shown in fig. 1 to 3, preferably, the oxygen pipeline 8 is provided with a third quick cut-off valve 83 communicated with the external environment, the air blast system of the oxygen-enriched blast furnace in front of the machine further comprises a nitrogen pipeline 9 communicated with the oxygen pipeline 8, the nitrogen pipeline 9 is provided with a second quick cut-off valve 91, and the control method further comprises: after the first quick cut valve 82 is closed, the third quick cut valve 83 and the second quick cut valve 91 are controlled to be opened.
In this scheme, first quick cut-off valve 82 closes the back, and third quick cut-off valve 83 and second quick cut-off valve 91 open, and third quick cut-off valve 83 opens and makes oxygen pipeline 8 switch on with external environment, and second quick cut-off valve 91 opens, and nitrogen gas pipeline 9 switches on, can sweep oxygen pipeline 8, clears up the oxygen in the oxygen pipeline 8, improves the security.
As shown in fig. 1 to 3, in any of the above embodiments, preferably, the recirculation line 5 is further provided with a cooler 52, and the control method further includes: when the operating parameter satisfies a first predetermined condition, the cooler 52 is turned on.
In the scheme, the temperature of the gas is higher after being pressurized by the air blower 3, and the gas is cooled by the cooler 52 and then flows into the air inlet pipeline 1 again, so that the temperature of the gas in the front oxygen-enriched blast furnace blast system is maintained in a safe range, and the safety of the front oxygen-enriched blast furnace blast system is improved.
As shown in fig. 1 to 3, in any of the above embodiments, preferably, the method further includes: acquiring the air outlet pressure of the air blower 3, and judging whether the air outlet pressure is smaller than a preset threshold value or not; and when the air outlet pressure is smaller than a preset threshold value, controlling the regulating valve to be closed.
In this scheme, when air-out pressure of air-blower 3 is lower, the control governing valve is closed, is convenient for improve the pressure in the gas outlet pipeline 2, and then improves air-out pressure.
As shown in fig. 1 to 3, in any of the above embodiments, preferably, when the outlet air pressure is smaller than the preset threshold after the regulating valve is closed for the preset time, the angle of the stator blade of the blower 3 is adjusted to increase the air output of the blower 3.
In this scheme, the air-out pressure is less than and predetermines the threshold value after the governing valve is closed and predetermines the time, adjusts the angle of 3 quiet leaves of air-blower, and then increases the pressure differential that 3 air-blowers admit air and give vent to anger, is convenient for promote the air-out pressure of air-blower 3 fast.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
As shown in fig. 1 to 3, the embodiment of the present invention provides a method for controlling a blower system of a front oxygen-enriched blast furnace, wherein a blower 3 of the blower system of the front oxygen-enriched blast furnace is communicated with an air inlet pipeline 1 and an air outlet pipeline 2, air is sucked into the blower 3 through the air inlet pipeline 1, is pressurized by the blower 3 and then is sent into a blast furnace 4 through the air outlet pipeline 2, an air inlet end of a recirculation pipeline 5 is communicated with the air outlet pipeline 2, an air outlet end of the recirculation pipeline 5 is communicated with the air inlet pipeline 1, and the recirculation pipeline 5 is connected with a first regulating valve 51 in series. The recirculation line 5 is also provided with a cooler 52. The front oxygen-enriched blast furnace air-blast system further comprises an anti-surge valve 6 communicated with the air outlet pipeline 2 and an oxygen pipeline 8, wherein the oxygen pipeline 8 is connected with a second regulating valve 81 and a first quick cut-off valve 82 in series, the oxygen pipeline 8 is communicated with the air inlet pipeline 1 through the second regulating valve 81, and the oxygen pipeline 8 is communicated with the external environment through a third quick cut-off valve 83. The blower system of the oxygen-enriched blast furnace in front of the machine also comprises a nitrogen pipeline 9 communicated with the oxygen pipeline 8, and the nitrogen pipeline 9 is provided with a second quick cut-off valve 91.
The control method of the air blast system of the oxygen-enriched blast furnace in front of the machine comprises the following steps: and S102, obtaining a prestored surge line S0, and drawing an anti-surge line S1 and a preset line S2 according to the surge line, wherein the standard throat pressure difference and the standard air outlet pressure of the anti-surge line S1 are 92% -95% of the standard throat pressure difference and the standard air outlet pressure of the surge line S0, and the standard throat pressure difference and the standard air outlet pressure of the preset line S2 are 90% -92% of the standard throat pressure difference and the standard air outlet pressure of the anti-surge line S1. Step S104, acquiring the throat pressure difference and the air outlet pressure of the blower 3; step S106, judging whether the throat pressure difference and the air outlet pressure of the blower 3 touch a pre-adjusting line S2; if yes, executing step S108 to adjust the stationary blade angle of the blower 3 to reduce the air output of the blower 3; step S110, controlling the first regulating valve 51 to open; step S112, acquiring the air inlet pressure of the blast furnace 4; a step S114 of determining whether the intake pressure of the blast furnace 4 is gradually decreased, and if the determination result is yes, executing a step S116 of decreasing the opening degree of the first regulating valve 51; otherwise, step S118 is executed to determine whether the intake pressure of the blast furnace 4 is gradually increased, and if the determination result is yes, step S120 is executed to increase the opening degree of the first regulating valve 51; otherwise, step S122 is executed to determine whether the throat pressure difference and the outlet air pressure of the blower 3 touch the surge-preventing line S1; if yes, executing step S124 to control the anti-surge valve 6 to open; step S126, controlling the first cut-off valve 82 to close; step S128, controlling the third quick cut-off valve 83 and the second quick cut-off valve 91 to be opened; step S130, acquiring the air outlet pressure of the air blower 3; step S132, judging whether the air outlet pressure is smaller than a preset threshold value; if yes, executing step S134 to close the first regulating valve 51; step S136, the angle of the stationary blade of the blower 3 is adjusted to increase the air output of the blower 3.
In this embodiment, in step S102, a prestored surge line S0 is obtained (where the prestored surge line is provided by the manufacturer of the blower 3), and an anti-surge line S1 and a preconditioning line S2 are drawn according to the surge line, where the standard throat pressure difference and the standard outlet air pressure of the anti-surge line S1 are 92% to 95% of the standard throat pressure difference and the standard outlet air pressure of the surge line S0, and the standard throat pressure difference and the standard outlet air pressure of the preconditioning line S2 are 90% to 92% of the standard throat pressure difference and the standard outlet air pressure of the anti-surge line S1.
Wherein, throat's pressure differential is gathered through pressure differential transmitter 11, and the pressure of outlet air is gathered through first pressure transmitter 12, and anti-surge control unit 10 receives the signal that pressure differential transmitter 11 and first pressure transmitter 12 gathered to according to the switching of signal control anti-surge valve 6, first governing valve 51 and first shut-off valve 82. The flow of the outlet line 2 is collected by a first flow transmitter 15, the pressure in the outlet line 2 is collected by a second pressure transmitter 16, the temperature of the gas in the outlet line 2 is collected by a temperature transmitter 14, and the flow in the recirculation line 5 is collected by a second flow transmitter 17. The equal flow/equal pressure control unit 13 receives signals collected by the first flow transmitter 15, the second flow transmitter 17, the second pressure transmitter 16, the temperature transmitter 14, and controls the vane angle of the blower 3 according to the collected signals.
Step S104, acquiring the throat pressure difference and the air outlet pressure of the blower 3; step S106, judging whether the throat pressure difference and the air outlet pressure of the blower 3 touch a pre-adjusting line S2; if the determination result is yes, the operating point of the blower 3 is shifted toward the surge line. Step S108 is executed to adjust the stationary blade angle of the blower 3 to reduce the air output of the blower 3, thereby reducing the air outlet pressure of the blower 3. And when the outlet air pressure of the blower 3 has a small increase after the stator blade angle is determined, the first regulating valve 51 is controlled to open and the cooling device is opened in step S110. To reduce the outlet air pressure of the blower 3. In this scheme, use the quiet leaf of air-blower 3 to adjust for giving first place to, simultaneously through the supplementary regulation of first governing valve 51, make the regulation of air-out wind pressure more accurate nimble. Meanwhile, the temperature of the gas is higher after being pressurized by the blower 3, and the gas flows into the air inlet pipeline 1 again after being cooled by the cooler 52, so that the temperature of the gas in the front oxygen-enriched blast furnace blast system is maintained in a safe range, and the safety of the front oxygen-enriched blast furnace blast system is improved.
Step S112, acquiring the air inlet pressure of the blast furnace 4; step S114, determining whether the intake pressure of the blast furnace 4 is gradually decreased, and if yes, executing step S116, decreasing the opening of the first regulating valve 51 so as to increase the outlet pressure of the blower 3 and further increase the intake pressure of the blast furnace 4. Otherwise, step S118 is executed to determine whether the air intake pressure of the blast furnace 4 is gradually increased, and if yes, step S120 is executed to increase the opening degree of the first regulating valve 51 so as to reduce the air outlet pressure of the blower 3 and further reduce the air intake pressure of the blast furnace 4. Therefore, the opening degree of the first regulating valve 51 is adjusted according to the air inlet pressure of the blast furnace 4, and the air outlet pressure is more flexibly regulated.
Otherwise, step S122 is executed to determine whether the throat pressure difference and the outlet air pressure of the blower 3 touch the surge-preventing line S1; if the determination result is yes, at this time, the first regulating valve 51 has failed, and the operating point of the blower 3 is closer to the surge preventing line, step S124 is executed to control the surge preventing valve 6 to open to rapidly reduce the outlet air pressure, so that the operating point of the blower 3 is rapidly away from the surge region.
Step S126, the first cut-off valve 82 is controlled to be closed to reduce the oxygen enrichment rate in the air inlet pipeline 1 and the air outlet pipeline 2, the air inlet volume of the blast furnace 4 can be properly increased, the air outlet pressure of the air blower 3 is further reduced, and the working point of the air blower 3 is far away from the surge line.
Step S128, the third quick cut-off valve 83 and the second quick cut-off valve 91 are controlled to be opened, the third quick cut-off valve 83 is opened to enable the oxygen pipeline 8 to be communicated with the external environment, the second quick cut-off valve 91 is opened, the nitrogen pipeline 9 is communicated, the oxygen pipeline 8 can be purged, oxygen in the oxygen pipeline 8 is emptied, and safety is improved.
Step S130, acquiring the air outlet pressure of the air blower 3; step S132, judging whether the air outlet pressure is smaller than a preset threshold value; if the determination result is yes, step S134 is executed to control the first regulating valve 51 to close, so that when the outlet air pressure of the blower 3 is low, the regulating valve is controlled to close, which is convenient for increasing the pressure in the outlet pipeline 2, and further increasing the outlet air pressure.
Step S136, the angle of the fixed blade of the air blower 3 is adjusted to increase the air output of the air blower 3, so that the air outlet pressure of the air blower 3 is conveniently and rapidly increased.
Taking a certain domestic blast furnace as an example, when the blast furnace is operated in winter, the daily iron yield is 11900t when the oxygen enrichment rate reaches 6 percent, the wind pressure at the outlet of the blower is 0.58MP (A), and the anti-surge air release rate is 400Nm3Min, the oxygen price of the plant is 0.8 yuan/Nm3After the system is reformed with the electricity price of 0.56 yuan/kw.h, the benefit calculation is considered according to 90 days in winter, and the analysis is as follows:
(1) benefits, including oxygen reduction emissions and blast furnace yield benefits:
the oxygen reduction and diffusion benefit is 248.8 ten thousand yuan;
the yield increasing benefit of iron making, if the oxygen supply capacity of the plant is surplus, the benefit of molten iron per ton is 300 yuan, and the yield increasing benefit is 964 ten thousand yuan when the oxygen enrichment rate is increased by 1% and the yield is increased by 3%.
(2) Cost, including circulating air pressurization and increased power consumption of cooling water:
the power consumption of cooling water is 12.4 ten thousand yuan.
The technical scheme of the invention is explained in detail by combining the attached drawings, and the control method of the air blast system of the front oxygen-enriched blast furnace provided by the invention comprises the steps of firstly obtaining the operation parameters of the air blower when the air blast system of the front oxygen-enriched blast furnace operates; when the operation parameters meet a first preset condition, the air blower is close to a surge area at the moment, the first regulating valve is controlled to be opened, so that the recirculation pipeline is conducted, the flow of the air blower is increased when the air blower is about to reach the surge area, the working condition point of the air blower returns to a normal area in a mode of increasing the air volume, meanwhile, gas can be recirculated through the recirculation loop instead of being discharged into the atmosphere, the economic benefit is better, and the cost is saved.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should be noted that in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
Claims (5)
1. A control method for a front oxygen-enriched blast furnace blower system, which is characterized in that a blower of the front oxygen-enriched blast furnace blower system is communicated with an air inlet pipeline (1) and an air outlet pipeline (2), gas is sucked into the blower through the air inlet pipeline (1), is pressurized by the blower and then is sent into a blast furnace (4) through the air outlet pipeline (2), the air inlet end of a recirculation pipeline (5) is communicated with the air outlet pipeline (2), the air outlet end of the recirculation pipeline (5) is communicated with the air inlet pipeline (1), and a first regulating valve (51) is connected in series with the recirculation pipeline (5), the control method comprises the following steps:
acquiring operation parameters of the blower, and judging whether the operation parameters meet a first preset condition;
when the operation parameters meet the first preset condition, controlling the first regulating valve (51) to be opened;
the acquiring of the operating parameters of the blower specifically includes:
acquiring the throat pressure difference and the air outlet pressure of the blower;
the judging whether the operating parameter meets a first preset condition specifically includes:
obtaining a prestored surge line S0, and drawing an anti-surge line S1 and a preset line S2 according to the surge line, wherein the standard throat pressure difference and the standard outlet air pressure of the anti-surge line S1 are 92% -95% of the standard throat pressure difference and the standard outlet air pressure of the surge line S0, and the standard throat pressure difference and the standard outlet air pressure of the preset line S2 are 90% -92% of the standard throat pressure difference and the standard outlet air pressure of the anti-surge line S1;
judging whether the throat pressure difference and the air outlet pressure of the blower touch the pre-adjusting line S2;
the air blast system of the oxygen-enriched blast furnace in front of the machine also comprises an anti-surge valve (6) communicated with the air outlet pipeline (2), and the control method also comprises the following steps:
when the throat pressure difference and the outlet air pressure of the blower touch the anti-surge line S1, controlling the anti-surge valve (6) to be opened;
the air blast system of the oxygen-enriched blast furnace in front of the machine further comprises an oxygen pipeline (8), the oxygen pipeline (8) is connected in series and communicated with an external environment to form a first quick cut-off valve (82), the air blast system of the oxygen-enriched blast furnace in front of the machine further comprises a nitrogen pipeline (9) communicated with the oxygen pipeline (8), the nitrogen pipeline (9) is provided with a second quick cut-off valve (91), and the control method further comprises the following steps;
when the throat pressure difference and the outlet air pressure of the blower touch the anti-surge line S1, controlling the first quick cut-off valve (82) to be closed and the second quick cut-off valve (91) to be opened;
an oxygen concentration measuring instrument is arranged on one side, close to the blower (3), of the air inlet pipeline (1), signals detected by the oxygen concentration measuring instrument are obtained and determined according to the received signals, and when the oxygen enrichment rate is higher than a preset range, the opening degree of the second regulating valve (81) is reduced; when the oxygen enrichment ratio is lower than a preset range, the opening degree of the second regulating valve (81) is increased.
2. The control method according to claim 1, characterized by further comprising:
and when the throat pressure difference and the air outlet pressure of the air blower touch the pre-adjusting line S2, adjusting the angle of the static blade of the air blower to reduce the air outlet quantity of the air blower.
3. A control method according to claim 1 or 2, characterized in that the recirculation line (5) is further provided with a cooler (52), the control method further comprising:
-turning on the cooler (52) when the operating parameter satisfies the first preset condition.
4. The control method according to claim 1 or 2, characterized by further comprising:
acquiring the air outlet pressure of the blower, and judging whether the air outlet pressure is smaller than a preset threshold value or not;
and when the air outlet pressure is smaller than the preset threshold value, controlling the regulating valve to be closed.
5. The control method according to claim 4,
and after the regulating valve is closed for the preset time, when the air outlet pressure is smaller than the preset threshold value, the angle of the fixed blade of the air blower is adjusted to increase the air outlet quantity of the air blower.
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| CN1434132A (en) * | 2003-02-21 | 2003-08-06 | 钢铁研究总院 | Integral blast furnace combined circulation method |
| IT1396001B1 (en) * | 2009-04-28 | 2012-11-09 | Nuovo Pignone Spa | ENERGY RECOVERY SYSTEM IN A GAS COMPRESSION PLANT |
| CN105604973B (en) * | 2015-12-18 | 2017-06-06 | 成都成发科能动力工程有限公司 | A kind of axial flow compressor all fronts anti-surge control method |
| CN105714007A (en) * | 2016-05-05 | 2016-06-29 | 开封中化换热设备有限公司 | Compressing fan oxygen supply device and blast-furnace smelting system using oxygen supply device |
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