CN104864268A - Method for controlling medium flow by adopting big pipe and small pipe - Google Patents
Method for controlling medium flow by adopting big pipe and small pipe Download PDFInfo
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- CN104864268A CN104864268A CN201410062451.8A CN201410062451A CN104864268A CN 104864268 A CN104864268 A CN 104864268A CN 201410062451 A CN201410062451 A CN 201410062451A CN 104864268 A CN104864268 A CN 104864268A
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Abstract
The invention provides a method for controlling the medium flow by adopting a big pipe and a small pipe. The method comprises steps as follows: under the condition that a big pipe stop valve is closed and when the valve opening of a small pipe regulating valve is larger than first opening for first preset time, the following steps are executed sequentially: the big pipe stop valve is opened, meanwhile, the valve opening of the small pipe regulating valve is regulated according to the flow requirement, when the big pipe stop valve is opened completely, the valve opening of a big pipe regulating valve is controlled to gradually increase to second opening and keep at the second opening, and meanwhile, the valve opening of the small pipe regulating valve is regulated according to the flow requirement. With the adoption of the method, the control precision of the medium flow is effectively improved, and the switching stability of the big and small pipes is guaranteed.
Description
Technical field
The present invention relates to the hot rolling technology field of metallurgical industry, particularly the rate-of flow controlling method of oven.
Background technique
The hot rolling technology of metallurgical industry mainly comprises heating and rolling two links, and so-called heating is exactly by heating of plate blank to predetermined temperature, to ensure rolling quality.For effectively heating slab, need to arrange bar plate heating stove, and the fuel that oven adopts mostly is mixed gas, primarily of two or three composition of blast furnace gas, coke-stove gas and coal gas of converter.The Main Function of gas station is mixed by certain calorific value requirement these three kinds or two kinds of gases, the difference that the ratio of mixing requires according to calorific value and different, and the pressure needed by oven after mixing pressurizes.Line is produced in usual hot rolling can arrange many oven, and the gas flow of needs is also larger, and significantly changes along with its gas using quantity of change of load and blow-on number also has.
In order to adapt to above-mentioned situation, as shown in Figure 1, existing gas station usually can arrange two pipelines in parallel and be used for carrying same medium (such as, mixed gas), and a diameter is comparatively large, can meet larger gas flow, be referred to as bassoon; Another root diameter is less, can meet less gas flow, be referred to as tubule.Two pipelines are respectively arranged with cut-off valve and modulating valve, with the demand of satisfied different gas flow.
The thing followed is choice for use and the switching problem of pipeline.Such as: when when use tubule with bassoon? the steady of rate-of flow how is ensured when pipeline switches? how uneoupled control is realized between the valve of two pipelines?
For above-mentioned three technical problems, there is the method that two kinds adopt the same medium of size management and control system at present:
1) no matter the demand consumption of oven to medium is how many, as long as this medium puts into operation, cut-off valve then on large tubule is opened simultaneously, two modulating valve come into operation simultaneously, and control the valve opening of these two modulating valve in real time by the output value of a controller, namely the valve opening of two modulating valve is identical.This method avoid the decoupling zero difficult problem between two pipelines, and do not need to consider when when use tubule with bassoon, also do not need the switching controls considering pipeline.But the shortcoming of the method is, because large tubule comes into operation and co-controlling valve opening simultaneously, the stability of system is declined, and particularly when small flow, its control accuracy is very poor, especially even uncontrollable when the flow of medium consumption lower than the minimal valve aperture of bassoon.Because the original intention arranging large tubule is that therefore, the method does not play the effect arranging large tubule, is only suitable for the larger and metastable situation of medium consumption in order to accurately measure and control media flow.
2) in line with the principle of " consumption hour tubule; bassoon when consumption is large ", namely flow has just been started when growing out of nothing, only open tubule cut-off valve and modulating valve, when flow reaches certain thresholding, think that current flux is comparatively large, then open bassoon cut-off valve and modulating valve, slowly close modulating valve and the cut-off valve of tubule simultaneously.When flow starts to reduce and reduces to certain thresholding, think that current flux is less, then open tubule cut-off valve and modulating valve, slowly close modulating valve and the cut-off valve of bassoon simultaneously.The method achieve the uneoupled control of large tubule, but the shortcoming of the method is, when large tubule switches, even " slowly closing " still can cause rate-of flow not steady, thus causes fluctuation to pressure and calorific value; When load variations is larger, there will be the opening and closing continually of size tube valve, aggravation fluctuation.Therefore, the method is only suitable for the layering of user's consumption and stable operating mode, can not be applied to special steel grade calorific value and pressure being had to requirement.
Summary of the invention
Large tubule cannot be adopted rate-of flow to be carried out to the technical problem accurately and steadily controlled to solve in prior art, the invention provides a kind of method adopting size management and control rate-of flow, the method comprises by the bassoon of parallel connection and tubule conveying heat medium to oven, bassoon is provided with bassoon cut-off valve and bassoon modulating valve, tubule is provided with tubule cut-off valve and tubule modulating valve, when the traffic demand of described heat medium grows out of nothing, open described tubule cut-off valve, and the valve opening of described tubule modulating valve is regulated according to described traffic demand, when the valve opening of described tubule modulating valve reduces until when described tubule modulating valve cuts out, close described tubule cut-off valve, it is characterized in that, the method also comprises: when described bassoon cut-off valve cuts out, when judge the valve opening of described tubule modulating valve be greater than the first aperture continued for first scheduled time time, perform following steps successively: open described bassoon cut-off valve, regulate the valve opening of described tubule modulating valve according to described traffic demand simultaneously, after described bassoon cut-off valve is opened completely, the valve opening controlling described bassoon modulating valve progressively increases to by set rate and remains on the second aperture, regulates the valve opening of described tubule modulating valve according to described traffic demand simultaneously.
Further, the method also comprises: when the valve opening of described bassoon modulating valve remains on described second aperture, when judge the valve opening of described tubule modulating valve be greater than the 3rd aperture continued for first scheduled time time, the valve opening controlling described tubule modulating valve is reduced to and remains on the 4th aperture, regulate the valve opening of described bassoon modulating valve according to described traffic demand, wherein said 3rd aperture is greater than described first aperture simultaneously.
Further, the method also comprises: when the valve opening of described tubule modulating valve remains on described 4th aperture, when judge the valve opening of described bassoon modulating valve be less than the 5th aperture continued for first scheduled time time, the valve opening controlling described bassoon modulating valve increases to and remains on described second aperture, regulate the valve opening of described tubule modulating valve according to described traffic demand, wherein said 5th aperture is less than described second aperture simultaneously.
Further, the method also comprises: when the valve opening of described bassoon modulating valve remains on described second aperture, when judge the valve opening of described tubule modulating valve be less than the 6th aperture continued for first scheduled time time, the valve opening controlling described bassoon modulating valve progressively reduces until the valve closing of described bassoon modulating valve by set rate, then described bassoon cut-off valve is closed, regulate the valve opening of described tubule modulating valve according to described traffic demand, wherein said 6th aperture is less than described first aperture simultaneously.
Preferably, controlling before the valve opening of described bassoon modulating valve progressively increases to the second aperture by set rate after described bassoon cut-off valve is opened completely, and after the valve closing of described bassoon modulating valve and closedown described bassoon cut-off valve before, also comprise the step of delay second scheduled time.
Preferably, described first aperture is 58% ~ 63% of the maximum valve opening of described tubule modulating valve, described second aperture is 10% ~ 18% of the maximum valve opening of described bassoon modulating valve, described 3rd aperture is 68% ~ 72% of the maximum valve opening of described tubule modulating valve, described 4th aperture is 65% ~ 67% of the maximum valve opening of described tubule modulating valve, described 5th aperture is 8% ~ 12% of the maximum valve opening of described bassoon modulating valve, and described 6th aperture is 42% ~ 48% of the maximum valve opening of described tubule modulating valve.
Preferably, described first aperture is 62% of the maximum valve opening of described tubule modulating valve, described second aperture is 15% of the maximum valve opening of described bassoon modulating valve, described 3rd aperture is 70% of the maximum valve opening of described tubule modulating valve, described 4th aperture is 65% of the maximum valve opening of described tubule modulating valve, described 5th aperture is 10% of the maximum valve opening of described bassoon modulating valve, and described 6th aperture is 45% of the maximum valve opening of described tubule modulating valve.
Preferably, described first scheduled time is 3 seconds, and described second scheduled time is 3 seconds, and described set rate is 0.1 degree/second.
The method of employing size management and control rate-of flow provided by the invention, in contrast to prior art, its beneficial effect is, the method can ensure to carry out control media flow according to traffic demand, the situation that rate-of flow is not enough or superfluous can not be produced, and effectively improve the control accuracy of rate-of flow; Meanwhile, can adjust flow in time when oven load significantly changes, ensure that the stability that large tubule switches, can ensure the stable of calorific value and force value while meeting traffic demand, this serves positive effect for calorific value and the stable of pressure.
Accompanying drawing explanation
Fig. 1 is the device schematic diagram that oven adopts size management and control rate-of flow;
Fig. 2 is the exemplary timing diagram preferred embodiment of the method for employing size management and control rate-of flow of the present invention.
Embodiment
Be described in further detail below in conjunction with the method for the drawings and specific embodiments to employing size management and control rate-of flow of the present invention, but not as a limitation of the invention.
As shown in Figure 1, same as the prior art, the method of employing size management and control rate-of flow of the present invention based on oven be provided with bassoon in parallel and tubule carries heat medium, bassoon is provided with bassoon cut-off valve and bassoon modulating valve, and tubule is provided with tubule cut-off valve and tubule modulating valve.
As shown in Figure 2, when the traffic demand of heat medium grows out of nothing, open tubule cut-off valve (not shown), and the valve opening of tubule modulating valve is regulated according to traffic demand, namely when flow increases, the valve opening of tubule modulating valve increases, and the valve opening of tubule modulating valve reduces when the flow if reduced.When the valve opening of tubule modulating valve reduces, until when closing, to close tubule cut-off valve (not shown).
When bassoon cut-off valve cuts out, when judging that the valve opening of tubule modulating valve continues to be greater than first aperture X1 first scheduled time (such as 3 seconds), think that depending merely on tubule is not enough to meet rate-of flow demand now, needs to open bassoon and participates in flow control.Concrete grammar is: first open bassoon cut-off valve, regulates the valve opening of described tubule modulating valve according to described traffic demand simultaneously, then, reach position completely when bassoon cut-off valve and postponed for second scheduled time (length of this retard time can set according to the technical experience of common practise or operator, such as 3 seconds) after, by set rate, (this set rate can be or the technical experience of operator sets according to known having sung the valve opening controlling bassoon modulating valve, such as 0.1 degree/second) progressively increase to the second aperture X2 and remain the second aperture X2, regulate the valve opening of tubule modulating valve according to traffic demand simultaneously, in this case rate-of flow be approximately 4 ten thousand steres/hour.Must guarantee under it should be noted that this situation that the cut-off valve of bassoon controls the aperture of tubule modulating valve after reaching position again according to traffic demand, to avoid the gas station chaser that causes because pressure is on the low side and the flame-out situation of oven.
When the valve opening of bassoon modulating valve remains the second aperture X2, if traffic demand continues to increase, when judging that the valve opening of tubule modulating valve continues to be greater than the 3rd aperture X3 first scheduled time (such as 3 seconds), X3>X1, think that fixing aperture tubule by bassoon regulates the traffic demand that can not meet now automatically, then need control tubule to fix aperture bassoon and automatically regulate.Concrete grammar is: the valve opening controlling tubule modulating valve is reduced to the 4th aperture X4 and remains the 4th aperture X4, to ensure the adjustment space of bassoon, regulates the valve opening of bassoon modulating valve according to traffic demand simultaneously.
When the valve opening of tubule modulating valve remains the 4th aperture X4, if traffic demand reduces, when judging that the valve opening of bassoon modulating valve continues to be less than the 5th aperture X5 first scheduled time (such as 3 seconds), X5<X2, think that fixing aperture tubule by bassoon regulates the traffic demand that just can meet now automatically, the valve opening then controlling bassoon modulating valve increases to the second aperture X2 and remains the second aperture X2, regulates the valve opening of tubule modulating valve according to traffic demand simultaneously.
When the valve opening of bassoon modulating valve remains the second aperture X2, if traffic demand continues to reduce, when judging that the valve opening of tubule modulating valve continues to be less than the 6th aperture X6 first scheduled time (such as 3 seconds), X6<X1, think that now depending merely on tubule just can meet traffic demand, by set rate, (this set rate can be or the technical experience of operator sets according to known having sung the valve opening then controlling bassoon modulating valve, such as 0.1 degree/second) progressively reduce until close, close completely at bassoon modulating valve and postponed for second scheduled time (length of this retard time can set according to the technical experience of common practise or operator, such as 3 seconds) after, control bassoon cut-off valve to close, regulate the valve opening of tubule modulating valve according to traffic demand simultaneously, in this case rate-of flow be approximately 2 ten thousand steres/hour.
This preferred embodiment in, first aperture X1 is 58% ~ 63% of the maximum valve opening of tubule modulating valve, be preferably 62%, second aperture X2 is 10% ~ 18% of the maximum valve opening of bassoon modulating valve, be preferably 15%, 3rd aperture X3 is 68% ~ 72% of the maximum valve opening of tubule modulating valve, be preferably 70%, 4th aperture X4 is 65% ~ 67% of the maximum valve opening of tubule modulating valve, be preferably 65%, 5th aperture X5 is 8% ~ 12% of the maximum valve opening of bassoon modulating valve, be preferably 10%, 6th aperture X6 is 42% ~ 48% of the maximum valve opening of tubule modulating valve, be preferably 45%.
This preferred embodiment in, progressively the increasing and progressively reduce all slowly to carry out according to set rate of bassoon modulating valve, thus valve opening can be avoided to suddenly change the impact caused rate-of flow and flow control.
Above embodiment is only illustrative embodiments of the present invention, can not be used for limiting the present invention, and protection scope of the present invention is defined by the claims.Those skilled in the art can in essence of the present invention and protection domain, and make various amendment or equivalent replacement to the present invention, these are revised or be equal to replacement and also should be considered as dropping in protection scope of the present invention.
Claims (10)
1. one kind adopts the method for size management and control rate-of flow, the method comprises by the bassoon of parallel connection and tubule conveying heat medium to oven, bassoon is provided with bassoon cut-off valve and bassoon modulating valve, tubule is provided with tubule cut-off valve and tubule modulating valve, when the traffic demand of described heat medium grows out of nothing, open described tubule cut-off valve, and the valve opening of described tubule modulating valve is regulated according to described traffic demand, when the valve opening of described tubule modulating valve reduces until when described tubule modulating valve cuts out, close described tubule cut-off valve, it is characterized in that, the method also comprises:
When described bassoon cut-off valve cuts out, when judge the valve opening of described tubule modulating valve be greater than the first aperture continued for first scheduled time time, perform following steps successively:
Open described bassoon cut-off valve, regulate the valve opening of described tubule modulating valve simultaneously according to described traffic demand;
After described bassoon cut-off valve is opened completely, the valve opening controlling described bassoon modulating valve progressively increases to by set rate and remains on the second aperture, regulates the valve opening of described tubule modulating valve according to described traffic demand simultaneously.
2. the method for employing size management and control rate-of flow according to claim 1, it is characterized in that, the method also comprises:
When the valve opening of described bassoon modulating valve remains on described second aperture, when judge the valve opening of described tubule modulating valve be greater than the 3rd aperture continued for first scheduled time time, the valve opening controlling described tubule modulating valve is reduced to and remains on the 4th aperture, regulate the valve opening of described bassoon modulating valve according to described traffic demand, wherein said 3rd aperture is greater than described first aperture simultaneously.
3. the method for employing size management and control rate-of flow according to claim 2, it is characterized in that, the method also comprises:
When the valve opening of described tubule modulating valve remains on described 4th aperture, when judge the valve opening of described bassoon modulating valve be less than the 5th aperture continued for first scheduled time time, the valve opening controlling described bassoon modulating valve increases to and remains on described second aperture, regulate the valve opening of described tubule modulating valve according to described traffic demand, wherein said 5th aperture is less than described second aperture simultaneously.
4. the method for employing size management and control rate-of flow according to claim 1, it is characterized in that, the method also comprises:
When the valve opening of described bassoon modulating valve remains on described second aperture, when judge the valve opening of described tubule modulating valve be less than the 6th aperture continued for first scheduled time time, the valve opening controlling described bassoon modulating valve progressively reduces until the valve closing of described bassoon modulating valve by set rate, then described bassoon cut-off valve is closed, regulate the valve opening of described tubule modulating valve according to described traffic demand, wherein said 6th aperture is less than described first aperture simultaneously.
5. the method for employing size management and control rate-of flow according to claim 4, it is characterized in that, controlling before the valve opening of described bassoon modulating valve progressively increases to the second aperture by set rate after described bassoon cut-off valve is opened completely, and after the valve closing of described bassoon modulating valve and closedown described bassoon cut-off valve before, also comprise the step of delay second scheduled time.
6. the method for employing size management and control rate-of flow according to claim 3, it is characterized in that, described first aperture is 58% ~ 63% of the maximum valve opening of described tubule modulating valve, described second aperture is 10% ~ 18% of the maximum valve opening of described bassoon modulating valve, described 3rd aperture is 68% ~ 72% of the maximum valve opening of described tubule modulating valve, described 4th aperture is 65% ~ 67% of the maximum valve opening of described tubule modulating valve, and described 5th aperture is 8% ~ 12% of the maximum valve opening of described bassoon modulating valve.
7. the method for employing size management and control rate-of flow according to claim 6, it is characterized in that, described first aperture is 62% of the maximum valve opening of described tubule modulating valve, described second aperture is 15% of the maximum valve opening of described bassoon modulating valve, described 3rd aperture is 70% of the maximum valve opening of described tubule modulating valve, described 4th aperture is 65% of the maximum valve opening of described tubule modulating valve, and described 5th aperture is 10% of the maximum valve opening of described bassoon modulating valve.
8. the method for employing size management and control rate-of flow according to claim 4, is characterized in that, described 6th aperture is 42% ~ 48% of the maximum valve opening of described tubule modulating valve.
9. the method for employing size management and control rate-of flow according to claim 8, is characterized in that, described 6th aperture is 45% of the maximum valve opening of described tubule modulating valve.
10. the method for the employing size management and control rate-of flow according to any one of claim 1-5, it is characterized in that, described first scheduled time is 3 seconds, and described second scheduled time is 3 seconds, and described set rate is 0.1 degree/second.
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| CN201410062451.8A CN104864268B (en) | 2014-02-24 | 2014-02-24 | Using the method for size management and control rate-of flow |
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| CN201410062451.8A CN104864268B (en) | 2014-02-24 | 2014-02-24 | Using the method for size management and control rate-of flow |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109578815A (en) * | 2018-12-25 | 2019-04-05 | 薛铭 | Circumference multitube flow controller |
| CN112138316A (en) * | 2020-09-23 | 2020-12-29 | 祥安消防科技有限公司 | Intelligent fire hydrant and control method thereof |
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| JPH075929A (en) * | 1993-06-18 | 1995-01-10 | Toshiba Corp | Regulating valve controller |
| JP2003065499A (en) * | 2001-08-24 | 2003-03-05 | Yazaki Corp | Bulk supply device |
| CN203215027U (en) * | 2013-05-07 | 2013-09-25 | 山西太钢不锈钢股份有限公司 | Control valve for large-pipe-diameter and double-valve-series multi-gas mixing system |
-
2014
- 2014-02-24 CN CN201410062451.8A patent/CN104864268B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH075929A (en) * | 1993-06-18 | 1995-01-10 | Toshiba Corp | Regulating valve controller |
| JP2003065499A (en) * | 2001-08-24 | 2003-03-05 | Yazaki Corp | Bulk supply device |
| CN203215027U (en) * | 2013-05-07 | 2013-09-25 | 山西太钢不锈钢股份有限公司 | Control valve for large-pipe-diameter and double-valve-series multi-gas mixing system |
Non-Patent Citations (1)
| Title |
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| 宋永杰: "宁钢高焦煤气混合装置存在问题及解决措施", 《河北冶金》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109578815A (en) * | 2018-12-25 | 2019-04-05 | 薛铭 | Circumference multitube flow controller |
| CN112138316A (en) * | 2020-09-23 | 2020-12-29 | 祥安消防科技有限公司 | Intelligent fire hydrant and control method thereof |
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| Publication number | Publication date |
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| CN104864268B (en) | 2017-08-25 |
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