CN114562892B - Top pressure control method for acid gun descending process of acid regeneration by spray roasting method - Google Patents
Top pressure control method for acid gun descending process of acid regeneration by spray roasting method Download PDFInfo
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- CN114562892B CN114562892B CN202210109800.1A CN202210109800A CN114562892B CN 114562892 B CN114562892 B CN 114562892B CN 202210109800 A CN202210109800 A CN 202210109800A CN 114562892 B CN114562892 B CN 114562892B
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- 239000002253 acid Substances 0.000 title claims abstract description 182
- 238000000034 method Methods 0.000 title claims abstract description 143
- 239000007921 spray Substances 0.000 title claims abstract description 42
- 230000008929 regeneration Effects 0.000 title claims abstract description 40
- 238000011069 regeneration method Methods 0.000 title claims abstract description 40
- 239000007788 liquid Substances 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000007131 hydrochloric acid regeneration reaction Methods 0.000 claims description 6
- XWROUVVQGRRRMF-UHFFFAOYSA-N F.O[N+]([O-])=O Chemical compound F.O[N+]([O-])=O XWROUVVQGRRRMF-UHFFFAOYSA-N 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000002699 waste material Substances 0.000 claims description 4
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 3
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 3
- 239000010962 carbon steel Substances 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 claims 1
- 238000005507 spraying Methods 0.000 abstract description 13
- 239000000779 smoke Substances 0.000 abstract description 3
- 239000003595 mist Substances 0.000 description 6
- 238000004364 calculation method Methods 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0006—Monitoring the characteristics (composition, quantities, temperature, pressure) of at least one of the gases of the kiln atmosphere and using it as a controlling value
- F27D2019/0009—Monitoring the pressure in an enclosure or kiln zone
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention is disclosed inThe method for controlling the pressure at the top of the acid gun descending process during acid regeneration by a spray roasting method is provided, and after an acid gun nozzle descends into an acid gun hole, a jacking set value SP freely descends along with a jacking process value PV; delay time t when acid gun nozzle falls into acid gun hole 1 After seconds, at t 2 The second jacking set value SP is from the current jacking process value PV 1 Slope down to the acid gun target top pressure set point SP L The method comprises the steps of carrying out a first treatment on the surface of the When the set top pressure value SP has been reduced to the target set top pressure value SP of the acid reducing gun L After that, the set top pressure value SP is kept unchanged t 3 Second, wait for the jacking process value PV to be adjusted and stabilized at the jacking set point SP L A vicinity; after the acid gun spray liquid cut-off valve is opened, the jacking set value SP freely rises along with the jacking process value PV; delay time t for starting spraying of acid gun 4 After that, at t 5 The jacking set value in seconds is from the current jacking process value PV 2 Ramp up to return to the normal set point SP H . The method can fully automatically control and regulate the top pressure, reduce the fluctuation of the top pressure and avoid yellow smoke in the process of descending the acid gun.
Description
Technical Field
The invention belongs to the technical field of acid regeneration in a cold rolling process in the metallurgical industry, and particularly relates to a furnace top pressure control method in a spray roasting method acid regeneration descending acid gun process.
Background
The stable control of the furnace top pressure of the acid regeneration unit roasting furnace adopting the spray roasting method has very important significance for the process running of the acid regeneration unit adopting the spray roasting method. The furnace roof pressure of the roasting furnace is generally controlled by a pressure controller adopting a PI algorithm: the process value PV of the controller is a furnace top pressure detection value, and a differential pressure transmitter is used for detecting the differential pressure between the furnace top of the roasting furnace and the atmosphere; the control value CV of the controller is the rotating speed of the variable-frequency speed-regulating exhaust fan, and the set value SP of the controller is set according to the process requirement.
When the acid regeneration recovery process is started, three acid guns are required to be inserted into the roasting furnace through acid gun holes corresponding to the acid guns at the top of the roasting furnace in sequence, and then liquid spraying roasting operation is started by opening liquid spraying valves corresponding to the acid guns. The descending acid gun process is characterized in that the descending acid gun process involves complex physicochemical processes such as gun hole blocking, liquid spraying opening, reaction combustion and the like, and is subjected to three descending acid gun processes in sequence, so that the self-ascending and suddenly descending of the top pressure are easily caused, and if the adjustment time or adjustment value of the top pressure controller set value SP is improper in the descending process, the sharp fluctuation of the top pressure is caused, so that the process of the acid regeneration unit is not beneficial to running smoothly.
The existing ejection control of the acid gun descending process of acid regeneration by spray roasting is realized by manually adjusting the ejection set value before descending the acid gun by an operator or by adjusting the ejection set value by simple step change according to a gun descending command by a control program, and the ejection adjustment time is long, the fluctuation range is large, the adjustment quality is poor and even the environment pollution caused by acid mist yellow smoke is generated from acid gun holes to the outside of the furnace in the gun descending process is easily caused by the two simple and rough control modes.
Disclosure of Invention
The invention aims to provide a furnace top pressure control method in the process of acid regeneration descending of an acid gun by a spray roasting method, which can realize full-automatic control of top pressure adjustment, reduce fluctuation of furnace top pressure of a roasting furnace in the process of descending of the acid gun, and avoid acid mist emission of Huang Yan from acid gun holes of the furnace top in the process of opening the acid gun, and has strong applicability and realizability.
The technical scheme adopted by the invention is as follows:
a method for controlling the top pressure of a spray roasting acid regeneration descending gun process comprises the following steps: 1) When the acid gun spray head falls into the acid gun hole, the jacking set value SP freely falls along with the jacking process value PV; 2) Delay time t when acid gun nozzle falls into acid gun hole 1 After seconds, at t 2 The second jacking set value SP is from the current jacking process value PV 1 Slope down to the acid gun target top pressure set point SP L The method comprises the steps of carrying out a first treatment on the surface of the 3) When the set top pressure value SP has been reduced to the target set top pressure value SP of the acid reducing gun L After that, the set top pressure value SP is kept unchanged t 3 Second, wait for the jacking process value PV to be adjusted and stabilized at the jacking set point SP L A vicinity; 4) After the acid gun spray liquid cut-off valve is opened, the set top pressure value SP follows the top pressure process value PVFreely rise; 5) Delay time t for starting spraying of acid gun 4 After that, at t 5 The jacking set value in seconds is from the current jacking process value PV 2 Ramp up to return to the normal set point SP H 。
Further, the acid gun target top pressure set value SP falls L And determining according to the number of the working acid guns which are lowered to the lower limit in the current roasting furnace.
Further, when the number of working acid guns in the lower limit of the front roasting furnace is 0, SP L ＝SP L0 The method comprises the steps of carrying out a first treatment on the surface of the SP when the number of working acid guns in the lower limit of the current roasting furnace is 1 L ＝SP L1 The method comprises the steps of carrying out a first treatment on the surface of the When the number of acid guns in the lower limit of the current roasting furnace is 2, SP L ＝SP L2, wherein SPL2 、SP L1 、SP L0 、SP H Is an adjustable parameter and meets the SP L2 <SP L1 <SP L0 <SP H <0。
Further, the acid gun in the step 2) is lowered into the acid gun hole for a delay time t 1 The jacking set value ramp down time t in step 2) 2 Jacking set point holding time t in step 3) 3 Opening delay time t of acid gun spray liquid cut-off valve in step 5) 4 Jacking ramp rise time t in step 5) 5 Are all adjustable parameters.
Further, in step 2), t 1 For the time that the jacking set value freely descends along with the jacking process value, namely the total execution time of the step 1), the calculation formula of the jacking set value SP is that
wherein ,PV1 The top pressure process value at the end of the step 1) and the beginning of the step 2) is detected by a top differential pressure transmitter; SP (service provider) L The acid gun target jacking set value is determined according to the number of the existing working acid guns in the current roasting furnace; t is t 2 Setting time for the ramp down, i.e. the total execution time of step 2); t is the actual executed time of the argument step 2).
Further, in step 5), t 4 For the time that the jacking set value freely rises along with the jacking process value, namely the total execution time of the step 4), the calculation formula of the jacking set value SP is that
wherein ,PV2 The top pressure process value at the end of the step 4) and the beginning of the step 5) is detected by a top differential pressure transmitter; SP (service provider) H The set value of the top pressure control is set when the lifting operation of the acid gun is not performed; t is t 5 Setting time for the slope, namely the total execution time of the step 5); t is the actual executed time of the argument step 5).
Further, the acid gun spray liquid cut-off valve comprises an acid gun waste acid cut-off valve and an acid gun water cut-off valve.
Further, the spray roasting method acid regeneration unit comprises a carbon steel hydrochloric acid regeneration unit, a silicon steel hydrochloric acid regeneration unit and a stainless steel hydrofluoric acid nitric acid mixed acid regeneration unit.
Furthermore, the furnace top pressure control method in the process of lowering the acid gun can be realized by programming on a PLC (programmable logic controller), a DCS (distributed control system), an industrial control computer, a singlechip and a DSP (digital signal processor) hardware platform.
The beneficial effects of the invention are as follows:
the method realizes the automatic calculation of the jacking set value in the process of lowering the acid gun, further realizes the full-automatic control of jacking adjustment, standardizes the jacking operation of the acid regeneration unit, reduces the labor intensity of operators in a main control room, improves the working efficiency and lightens the labor intensity of the workers;
the method reasonably utilizes the trend of variation of furnace top pressure process value in the process of gun hole blocking during gun descending and spray liquid starting to carry out free following control, reasonably utilizes the measures of set value slope lifting to carry out smooth control and the like, shortens the transition time of top pressure adjustment, reduces the fluctuation range of top pressure adjustment, reduces the fluctuation of furnace top pressure of the roasting furnace in the process of acid gun descending, and improves the top pressure adjustment quality in the process of acid gun descending;
according to the method, the top pressure is reduced to a reasonable value in advance before the spray is started, so that acid mist Huang Yan generated in the acid gun holes at the top of the gun is avoided in the spray starting process, the probability that the steel structure of the high-rise frame of the acid regeneration factory building is corroded by the acid mist is reduced, and the field labor environment is improved;
the method can be realized on various types of control hardware platforms only through software programming, can be used for newly building an acid regeneration unit and can also be used for reconstruction of the built acid regeneration unit, and has strong applicability and realizability.
Drawings
FIG. 1 is a flow chart of a method for controlling the top pressure of a spray roasting process acid regeneration descending gun.
FIG. 2 is a schematic diagram of a set point graph of the top pressure in the process of lowering the top pressure of the acid gun in the process of lowering the acid gun in the acid regeneration process of spray roasting.
Detailed Description
The invention is further described below with reference to the drawings and examples.
As shown in fig. 1 and 2, a method for controlling the top pressure of a spray roasting acid regeneration descending gun process comprises the following steps:
1) When the acid gun nozzle falls into the acid gun hole, the jacking set value SP freely falls along with the jacking process value PV: i.e. the set point SP of the pressure controller is equal to the process value PV (sp=pv), the pressure controller is in manual mode, and the output value CV is kept unchanged, i.e. the exhaust fan speed is kept unchanged. The acid gun nozzle is used to enter the roasting furnace to block the acid gun hole, and the air field wind sucked into the roasting furnace is suddenly reduced, so that the jacking pressure is freely reduced according to the variation trend of the jacking pressure.
2) Delay time t when acid gun nozzle falls into acid gun hole 1 After seconds, at t 2 The second jacking set value SP is from the current jacking process value PV 1 Slope down to the acid gun target top pressure set point SP L : namely, in the step, the set top pressure value SP automatically changes in a slope according to the following formula:
wherein ,PV1 The top pressure process value at the end of the step 1) and the beginning of the step 2) is detected by a top differential pressure transmitter; SP (service provider) L The acid gun target jacking set value is determined according to the number of the existing working acid guns in the current roasting furnace; t is t 2 Setting time for slope descent, namely the total execution time of the step 2), wherein t is the actual executed time of the independent variable step 2); t is t 1 The time for the set point of the jacking to freely drop following the value of the jacking process, i.e. the total execution time of step 1). In the step, the control output value CV of the jacking controller is smoothly increased, and the rotating speed of the exhaust fan is gradually increased so as to further reduce the pressure of the furnace top.
3) When the set top pressure value SP has been reduced to the target set top pressure value SP of the acid reducing gun L After that, the set top pressure value SP is kept unchanged t 3 Second, wait for the jacking process value PV to be adjusted and stabilized at the jacking set point SP L The following are: i.e. sp=sp L Hold t 3 The second is unchanged, and the set value of the jacking is set at SP L However, due to the hysteresis of the jacking adjustment, the jacking process value PV cannot be stabilized immediately around the jacking set point SP, by t 3 The waiting and stabilizing time of seconds creates conditions for the acid gun valve opening and spraying liquid in the step 4).
4) After the acid gun spray liquid cut-off valve is opened, the jacking set value SP freely rises along with the jacking process value PV: i.e. the set point SP of the pressure controller is equal to the process value PV (sp=pv), the pressure controller is in manual mode, and the output value CV is kept unchanged, i.e. the exhaust fan speed is kept unchanged. In the step, a large amount of waste acid liquid or water liquid with lower temperature is sprayed into the roasting furnace through an acid gun nozzle to cause sudden temperature drop at the furnace top, and a top temperature controller is used for ensuring constant top temperature, and the gas fed into the furnace through a burner at the bottom of the roasting furnace and the flow rate of combustion-supporting air are rapidly increased to cause the working condition of rapid expansion of the gas in the roasting furnace, so that the top pressure is freely raised according to the variation trend of the top pressure.
5) Delay time t for starting spraying of acid gun 4 After that, at t 5 The jacking set value in seconds is from the current jacking process value PV 2 Ramp up to return to normalSet point SP of top pressure H : namely, in the step, the set top pressure value SP automatically rises and changes according to the following formula:
wherein ,PV2 The top pressure process value at the end of the step 4) and the beginning of the step 5) is detected by a top differential pressure transmitter; SP (service provider) H The set value of the top pressure control is set when the lifting operation of the acid gun is not performed; t is t 5 Setting time for the slope, namely the total execution time of the step 5), wherein t is the actual executed time of the independent variable step 5); t is t 4 The time for the set-point of the jacking to rise freely following the value of the jacking process, i.e. the total execution time of step 4). In the step, the control output value CV of the jacking controller is smoothly reduced, and the rotating speed of the exhaust fan is gradually reduced so as to raise the pressure of the furnace top.
Acid gun target top pressure set value SP L Determining according to the number of working acid guns which are lowered to the lower limit in the current roasting furnace: SP when the number of the liquid spraying working acid guns in the lower limit of the front roasting furnace is 0 L ＝SP Lo The method comprises the steps of carrying out a first treatment on the surface of the SP when the number of the liquid spraying working acid guns in the lower limit of the front roasting furnace is 1 L ＝SP L1 The method comprises the steps of carrying out a first treatment on the surface of the SP when the number of the liquid spraying working acid guns in the lower limit of the front roasting furnace is 2 L ＝SP L2, wherein SPL2 、SP L1 、SP L0 、SP H Are all adjustable parameters, can be modified by a process engineer through an operation screen, and satisfy the following relation SP L2 <SP L1 <SP L0 <SP H <0. Wherein SP is H To ensure that the acid regeneration recovery process runs smoothly, in this embodiment, SP is the set value of the top pressure control when the lifting operation of the acid gun is not performed H ＝-0.25kPa，SP L2 、SP L1 、SP L0 The three jacking set values are respectively set by a gun descending target jacking set value when two working acid guns, one working acid gun and no working acid gun are arranged in the furnace, and the three jacking set values take the aim of ensuring that the acid gun holes do not emit yellow smoke outside the furnace after the acid gun starts spraying liquid, thus the implementation is realizedIn the example, SP L2 ＝-0.90kPa，SP L1 ＝-0.80kPa，SP L0 ＝-0.70kPa。
Delay time t of dropping acid gun into acid gun hole in step 2) 1 The jacking set value ramp down time t in step 2) 2 Jacking set point holding time t in step 3) 3 Opening delay time t of acid gun spray liquid cut-off valve in step 5) 4 Jacking set point ramp-up time t in step 5) 5 All are adjustable parameters which can be modified and set by a process engineer through an operation picture, and the adjustable parameters are aimed at ensuring stable adjustment and change of the top pressure. In this embodiment, the acid gun in step 2) is lowered into the acid gun hole for a delay time t 1 Time t of ramp down of the set point of the jacking in step 2) =5 s 2 Time t for holding the set-point of the jacking in step 3) =15 s 3 Time t of spray delay of acid gun in step 5) =5 s 4 Time t of rise of the jacking ramp in step 5) =3 s 5 ＝15s。
The acid gun spray liquid cut-off valve comprises an acid gun waste acid cut-off valve and an acid gun water cut-off valve. The method is suitable for two working conditions of acid spraying and water spraying into the roasting furnace through the acid gun, and is correspondingly suitable for process operation modes of various acid regeneration units such as an acid operation mode, a regenerated acid operation mode, a concentrated acid operation mode, a water operation mode, a new water operation mode and the like.
The spray roasting method acid regeneration unit comprises a carbon steel hydrochloric acid regeneration unit, a silicon steel hydrochloric acid regeneration unit and a stainless steel hydrofluoric acid nitric acid mixed acid regeneration unit. In the embodiment, the spray roasting method acid regeneration unit is a stainless steel hydrofluoric acid nitric acid mixed acid regeneration unit.
The furnace top pressure control method in the process of lowering the acid gun can be realized by programming on a plurality of hardware platforms such as a PLC, a DCS, an industrial personal computer, a singlechip, a DSP and the like. In the embodiment, the furnace top pressure control method in the process of lowering the acid gun is realized on Siemens S7-400 PLC through LAD language software programming in Step7 programming software.
The method realizes the automatic calculation of the jacking set value in the process of lowering the acid gun, further realizes the full-automatic control of jacking adjustment, standardizes the jacking operation of the acid regeneration unit, reduces the labor intensity of operators in a main control room, improves the working efficiency and lightens the labor intensity of the workers; the method reasonably utilizes the trend of variation of furnace top pressure process value in the process of gun hole blocking during gun descending and spray liquid starting to carry out free following control, reasonably utilizes the measures of set value slope lifting to carry out smooth control and the like, shortens the transition time of top pressure adjustment, reduces the fluctuation range of top pressure adjustment, reduces the fluctuation of furnace top pressure of the roasting furnace in the process of acid gun descending, and improves the top pressure adjustment quality in the process of acid gun descending; according to the method, the top pressure is reduced to a reasonable value in advance before the spray is started, so that acid mist Huang Yan generated in the acid gun holes at the top of the gun is avoided in the spray starting process, the probability that the steel structure of the high-rise frame of the acid regeneration factory building is corroded by the acid mist is reduced, and the field labor environment is improved; the method can be realized on various types of control hardware platforms only through software programming, can be used for newly building an acid regeneration unit and can also be used for reconstruction of the built acid regeneration unit, and has strong applicability and realizability.
It will be understood that modifications and variations will be apparent to those skilled in the art from the foregoing description, and it is intended that all such modifications and variations be included within the scope of the following claims.
Claims (7)
1. A method for controlling the top pressure of a spray roasting acid regeneration descending gun process is characterized in that: comprises the steps of 1) jacking a set value after the acid gun nozzle drops into the acid gun holeFollow the value of the jacking process->Freely descend; 2) Delay time when the acid gun nozzle falls into the acid gun hole>After a second, at->Jacking set value +.>From the current jacking process value->Slope down to the target top pressure set value of acid-reducing gun +.>The method comprises the steps of carrying out a first treatment on the surface of the 3) When the jacking set value->Has fallen to the target top pressure setting value of the acid reducing gun +.>After that, the set top pressure SP is kept unchanged +.>Second, wait for the value of the roof pressure process +.>Is regulated and stabilized at the set value of the top pressure +.>A vicinity; 4) After the spray liquid cut-off valve of the acid gun is opened, the jacking set value is +.>Follow the value of the jacking process->Freely rise; 5) Delay time of starting spray of acid gun>After that, atJacking set value +.>From the current jacking process value->Ramp up to return to the normal jacking set point +.>；
In the step 2 of the process, the process is carried out,for the time during which the jacking set point falls freely following the jacking process value, i.e. the total execution time of step 1), the jacking set point +.>Is calculated as
wherein ,the top pressure process value at the end of the step 1) and the beginning of the step 2) is detected by a top differential pressure transmitter; />The acid gun target jacking set value is determined according to the number of the existing working acid guns in the current roasting furnace; />Setting a time for the ramp down, i.e. the total execution time of step 2), the +.>The actual executed time of step 2) is an argument;
in the step 5 of the process, the process is carried out,for the time during which the jacking set point rises freely following the jacking process value, i.e. the total execution time of step 4), the jacking set point +.>Is calculated as
wherein ,the top pressure process value at the end of the step 4) and the beginning of the step 5) is detected by a top differential pressure transmitter; />The set value of the top pressure control is set when the lifting operation of the acid gun is not performed; />Setting a time for the ramp, i.e. the total execution time of step 5), +.>The actual executed time of step 5) is an argument.
2. The spray roasting method acid regeneration acid gun process top pressure control method according to claim 1, wherein: target top pressure set value of acid reducing gunAnd determining according to the number of the working acid guns which are lowered to the lower limit in the current roasting furnace.
3. The spray roasting method acid regeneration acid gun process top pressure control method according to claim 2, characterized in that:
working acid gun limited in lower part in current roasting furnaceWhen the number of the organic light emitting diode units is 0,the method comprises the steps of carrying out a first treatment on the surface of the When the number of working acid guns at the lower limit in the current roasting furnace is 1, the number of working acid guns is +.>The method comprises the steps of carrying out a first treatment on the surface of the When the number of acid guns at the lower limit in the current roasting furnace is 2, the number of acid guns is +>, wherein />、/>、/>、/>Is an adjustable parameter and satisfies +.>。
4. The spray roasting method acid regeneration acid gun process top pressure control method according to claim 1, wherein: delay time for lowering acid gun into acid gun hole in step 2)The set-point ramp-down time of the top pressure in step 2)>Top pressure set point holding time in step 3)>Acid gun spray cutting in step 5)Valve opening delay time +.>Top-pressure ramp-up time in step 5)>Are all adjustable parameters.
5. A spray roasting process acid regeneration descending acid gun process roof pressure control method according to any one of claims 1 to 4, characterised in that: the acid gun spray liquid cut-off valve comprises an acid gun waste acid cut-off valve and an acid gun water cut-off valve.
6. A spray roasting process acid regeneration descending acid gun process roof pressure control method according to any one of claims 1 to 4, characterised in that: the spray roasting method acid regeneration unit comprises a carbon steel hydrochloric acid regeneration unit, a silicon steel hydrochloric acid regeneration unit and a stainless steel hydrofluoric acid nitric acid mixed acid regeneration unit.
7. A spray roasting process acid regeneration descending acid gun process roof pressure control method according to any one of claims 1 to 4, characterised in that: the furnace top pressure control method in the process of lowering the acid gun can be realized by programming on a PLC (programmable logic controller), a DCS (distributed control system), an industrial control computer, a singlechip and a DSP (digital signal processor) hardware platform.
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| CN1851320A (en) * | 2006-04-28 | 2006-10-25 | 中冶南方工程技术有限公司 | Hydrochloride waste regenerating process for spray roasting |
| JP2009041897A (en) * | 2007-07-19 | 2009-02-26 | Mhi Environment Engineering Co Ltd | Roasting facility juxtaposed to incinerator |
| CN102559964A (en) * | 2012-02-10 | 2012-07-11 | 中冶南方工程技术有限公司 | Feedforward control method of furnace top pressure of blast furnace |
| CN202494351U (en) * | 2012-03-23 | 2012-10-17 | 西安电炉研究所有限公司 | Detection and regulation system of ore-smelting electric furnace furnace-chamber pressure |
| JP2014018769A (en) * | 2012-07-20 | 2014-02-03 | Nippon Steel & Sumitomo Metal | Method and facility for treating waste acid |
| KR101369887B1 (en) * | 2012-12-12 | 2014-03-05 | 주식회사 포스코 | Apparatus and method for control top gas pressure of blast furnace |
| CN215559000U (en) * | 2021-07-22 | 2022-01-18 | 北京思奇艺科技有限公司 | Negative pressure control system applied to acid regeneration unit by roasting method |
| CN113701171A (en) * | 2021-08-23 | 2021-11-26 | 山东钢铁集团日照有限公司 | Control method for preventing furnace bottom from hardening in acid regeneration roasting furnace |
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