CN103216819B - Vaporizing cooling oxygen-eliminating device pressure diffuses control method and system thereof - Google Patents
Vaporizing cooling oxygen-eliminating device pressure diffuses control method and system thereof Download PDFInfo
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- CN103216819B CN103216819B CN201310107126.4A CN201310107126A CN103216819B CN 103216819 B CN103216819 B CN 103216819B CN 201310107126 A CN201310107126 A CN 201310107126A CN 103216819 B CN103216819 B CN 103216819B
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Abstract
The invention provides a kind of novel Vaporizing cooling oxygen-eliminating device pressure and diffuse control method and system thereof, control system comprises oxygen-eliminating device, oxygen-eliminating device is provided with pressure unit, PLC and diffusion valve, described pressure unit, diffusion valve are connected with PLC respectively, pressure unit is for measuring the pressure of oxygen-eliminating device, diffusion valve on described oxygen-eliminating device takes two pneumatic cut-off valves, and PLC is used for the switch of Stress control two pneumatic cut-off valves recorded by pressure unit.The nominal diameter of described two pneumatic cut-off valves small one and large one.Beneficial effect of the present invention: utilize pneumatic cut-off valve valve opening to close the fast feature of valve events, two pneumatic cut-off valve step control are adopted to diffuse oxygen-eliminating device pressure, solve the problem that Vaporizing cooling oxygen-eliminating device diffuses the too fast Stress control shakiness of rear pressure drop, strengthen deaerating effect, increase Steam Recovery time and evaporated flue life-span simultaneously.
Description
Technical field
The present invention relates to metallurgy industry process for making, be specifically related to a kind of Vaporizing cooling oxygen-eliminating device pressure and diffuse control method and system thereof.
Background technology
In converter steelmaking process, evaporated cooling system is the important step ensureing cooling hood, also can carry out heat recovery and produce steam in convertor steelmaking process, reduce the production cost of enterprise.The life-span of evaporated flue is to one of important indicator that evaporated cooling system is examined.Ensure the life-span of evaporated flue, the oxygen level of flue recirculated cooling water must reduce, and oxygen-eliminating device is the key equipment of flue recirculated cooling water.Oxygen-eliminating device relies on steam to be heated by recirculated cooling water, and in general control oxygen-eliminating device, Stress control is advisable at 0.2MPa ~ 0.3MPa, controls water temperature in oxygen-eliminating device at about 131 DEG C.So namely the Stress control in oxygen-eliminating device becomes the key point of deaerating effect quality.
With reference to shown in Fig. 1, existing Vaporizing cooling oxygen-eliminating device pressure diffuses control system, comprises oxygen-eliminating device 1, and oxygen-eliminating device 1 is provided with pressure unit 2, PLC 3 and electronic diffusion valve 6, and described pressure unit 2, electronic diffusion valve 6 are connected with PLC 3 respectively.In converter normal productive process, normal running flow process is to oxygen-eliminating device 1 moisturizing by softened water tank, introduce steam by steam pipe system to enter the soft water heating in oxygen-eliminating device 1 in oxygen-eliminating device 1, the vapor pressure in oxygen-eliminating device 1 is controlled by pressure unit 2, water temperature is made to reach 131 DEG C, after bessemerizing the water consumed in drum, by oxygen-eliminating device 1 moisturizing to drum.Diffusion valve on oxygen-eliminating device 1 is traditionally arranged to be electronic diffusion valve 6, when being caused (being generally 0.4MPa to open during hypertonia in oxygen-eliminating device 1 by the steam that variable valve 7 is introduced by steam pipe system, 0.3MPa closes), the electronic diffusion valve 6 on oxygen-eliminating device 1 is opened by PLC 3.Action feature due to electronic diffusion valve 6 is that action is slower, when opening electronic diffusion valve 6 initial stage, oxygen-eliminating device 1 pressure drop is not obvious, after electronic diffusion valve 6 is opened completely, because exhaust stack caliber is excessive, oxygen-eliminating device 1 pressure drop can be caused too fast, in oxygen-eliminating device 1, water temperature reduces, deaerating effect is bad, affects oxygen removal efficiency.Because oxygen-eliminating device electronic diffusion valve 6 valve opening is too small with pass valve range of set value, electronic diffusion valve 6 acts frequently, and valve also easily damages, and causes very large burden to production maintenance.
Summary of the invention
The technical problem to be solved in the present invention is, for the problems referred to above that existing oxygen-eliminating device exists, provides a kind of Vaporizing cooling oxygen-eliminating device pressure to diffuse control method and system thereof.
The present invention for solving the problems of the technologies described above adopted technical scheme is:
Vaporizing cooling oxygen-eliminating device pressure diffuses control method, adopts two pneumatic cut-off valve step control to diffuse oxygen-eliminating device pressure:
A) only open a pneumatic cut-off valve when oxygen-eliminating device pressure diffuses value H1 higher than first and diffuse oxygen-eliminating device pressure;
B) when oxygen-eliminating device pressure continue rise, diffuse more than first value H1 too much arrive second diffuse value H2 after, open two pneumatic cut-off valves simultaneously, keep two pneumatic cut-off valves to diffuse oxygen-eliminating device pressure simultaneously;
C) after oxygen-eliminating device pressure is lower than the first dangerous values L1, any pneumatic cut-off valve is closed at once;
D) after pressure continues to be reduced to the second dangerous values L2, close two pneumatic cut-off valves simultaneously;
Above-mentioned first diffuses that value H1, second diffuses value H2, the first dangerous values L1, the second dangerous values L2 meets relational expression H2>H1>L1>L2.
In such scheme, described control method adopts small one and large one pneumatic cut-off valve step control of two nominal diameters to diffuse oxygen-eliminating device pressure further:
A) only open the little pneumatic cut-off valve of nominal diameter when oxygen-eliminating device pressure diffuses value H1 higher than first and diffuse oxygen-eliminating device pressure;
B) when oxygen-eliminating device pressure continue rise, diffuse more than first value H1 too much arrive second diffuse value H2 after, open the pneumatic cut-off valve that nominal diameter is large simultaneously, keep two pneumatic cut-off valves to diffuse oxygen-eliminating device pressure simultaneously;
C) after oxygen-eliminating device pressure is lower than the first dangerous values L1, the large pneumatic cut-off valve of nominal diameter is closed at once;
D) after pressure continues to be reduced to the second dangerous values L2, close the little pneumatic cut-off valve of nominal diameter simultaneously;
Above-mentioned first diffuses that value H1, second diffuses value H2, the first dangerous values L1, the second dangerous values L2 meets relational expression H2>H1>L1>L2.
Present invention also offers a kind of Vaporizing cooling oxygen-eliminating device pressure and diffuse control system, comprise oxygen-eliminating device, oxygen-eliminating device is provided with pressure unit, PLC and diffusion valve, described pressure unit, diffusion valve are connected with PLC respectively, pressure unit is for measuring the pressure of oxygen-eliminating device, diffusion valve on described oxygen-eliminating device takes two pneumatic cut-off valves, and PLC is used for the switch of Stress control two pneumatic cut-off valves recorded by pressure unit.
In such scheme, the nominal diameter of described two pneumatic cut-off valves small one and large one.
In such scheme, described oxygen-eliminating device is also provided with Safety relief valve.
The present invention has following beneficial effect relative to original electronic diffusion valve control pressurer system:
Electronic diffusion valve on original oxygen-eliminating device is changed to small one and large one pneumatic cut-off valve of two nominal diameters, relative to maximum feature electronic diffusion valve, pneumatic cut-off valve is that valve opening closes valve corresponding speed faster, and after valve opening, pressure drop time delay is little; Pneumatic cut-off valve valve opening is utilized to close the fast feature of valve events, step control diffuses oxygen-eliminating device pressure, solve the problem that Vaporizing cooling oxygen-eliminating device diffuses the too fast Stress control shakiness of rear pressure drop well, the maintenance oxygen-eliminating device pressure long period is in the pressure rating can sending steam outside, Stress control is accurate, strengthen deaerating effect, increase Steam Recovery time and evaporated flue life-span simultaneously.
Accompanying drawing explanation
Fig. 1 is the structural representation that existing Vaporizing cooling oxygen-eliminating device pressure diffuses control system.
Fig. 2 is the structural representation that Vaporizing cooling oxygen-eliminating device pressure of the present invention diffuses control system.
In figure, 1-oxygen-eliminating device, 2-pressure unit, 3-PLC controller, 4-pneumatic cut-off valve, 41-DN100 pneumatic cut-off valve, 42-DN50 pneumatic cut-off valve, 5-Safety relief valve, the electronic diffusion valve of 6-, 7-variable valve.
Embodiment
Below in conjunction with embodiment and accompanying drawing, technical scheme of the present invention is further described in detail.
With reference to shown in Fig. 2, Vaporizing cooling oxygen-eliminating device pressure of the present invention diffuses control system, comprise oxygen-eliminating device 1, oxygen-eliminating device 1 is provided with pressure unit 2, PLC 3 and diffusion valve, described pressure unit 2, diffusion valve 6 are connected with PLC 3 respectively, pressure unit 2 is for measuring the pressure of oxygen-eliminating device 1, and the diffusion valve on described oxygen-eliminating device 1 takes two pneumatic cut-off valves 4, the switch of Stress control two pneumatic cut-off valves 4 of PLC 3 for being recorded by pressure unit 2.
The nominal diameter of described two pneumatic cut-off valves 4 small one and large one.
Described oxygen-eliminating device 1 is also provided with Safety relief valve 5.
Oxygen-eliminating device 1 pressure of the present invention is introduced by the variable valve 7 of steam pipe system by pressure unit 2 side, adopt small one and large one pneumatic cut-off valve 4---DN100 pneumatic cut-off valve 41 and DN50 pneumatic cut-off valve 42 of two nominal diameters, step control diffuses oxygen-eliminating device 1 pressure, specifically comprises the following steps:
A) only open the little DN50 pneumatic cut-off valve 42 of nominal diameter when oxygen-eliminating device 1 pressure diffuses value 0.4MPa higher than first and diffuse oxygen-eliminating device 1 pressure, maintain the pressure in oxygen-eliminating device 1 as far as possible, ensure oxygen-eliminating device 1 deaerating effect;
B) when oxygen-eliminating device 1 pressure continue rise, diffuse more than first value 0.4MPa too much arrive second diffuse value 0.45MPa after, open the DN100 pneumatic cut-off valve 41 that nominal diameter is large simultaneously, keep two pneumatic cut-off valves 4 to diffuse oxygen-eliminating device pressure simultaneously;
C) after oxygen-eliminating device 1 pressure is lower than the first dangerous values 0.35MPa, the large DN100 pneumatic cut-off valve 41 of nominal diameter is closed at once;
D) after oxygen-eliminating device 1 pressure continues to be reduced to the second dangerous values 0.25MPa, close the little DN50 pneumatic cut-off valve 42 of nominal diameter simultaneously.
The present invention the electronic diffusion valve 6 of DN150 on oxygen-eliminating device original in Fig. 1 is changed to two nominal diameters small one and large one DN100 pneumatic cut-off valve 41 and DN50 pneumatic cut-off valve 42, it is faster that pneumatic cut-off valve 4 feature maximum relative to electronic diffusion valve 6 is that valve opening closes valve corresponding speed, and after valve opening, pressure drop time delay is little; Pneumatic cut-off valve 4 valve opening is utilized to close the fast feature of valve events, step control diffuses oxygen-eliminating device 1 pressure, solve the problem that Vaporizing cooling oxygen-eliminating device diffuses the too fast Stress control shakiness of rear pressure drop well, strengthen deaerating effect, increase Steam Recovery time and evaporated flue life-span simultaneously.
Above-describedly be only preferred embodiment of the present invention; certainly the interest field of the present invention can not be limited with this; therefore adopt or similar process identical with this example, or according to the equivalence change that the present patent application the scope of the claims is done, still belong to protection scope of the present invention.
Claims (3)
1. Vaporizing cooling oxygen-eliminating device pressure diffuses control method, it is characterized in that: adopt small one and large one pneumatic cut-off valve step control of two nominal diameters to diffuse oxygen-eliminating device pressure:
A) only open the little pneumatic cut-off valve of nominal diameter when oxygen-eliminating device pressure diffuses value H1 higher than first and diffuse oxygen-eliminating device pressure;
B) when oxygen-eliminating device pressure continue rise, diffuse more than first value H1 too much arrive second diffuse value H2 after, open the pneumatic cut-off valve that nominal diameter is large simultaneously, keep two pneumatic cut-off valves to diffuse oxygen-eliminating device pressure simultaneously;
C) after oxygen-eliminating device pressure is lower than the first dangerous values L1, the large pneumatic cut-off valve of nominal diameter is closed at once;
D) after pressure continues to be reduced to the second dangerous values L2, close the little pneumatic cut-off valve of nominal diameter simultaneously;
Above-mentioned first diffuses that value H1, second diffuses value H2, the first dangerous values L1, the second dangerous values L2 meets relational expression H2>H1>L1>L2.
2. Vaporizing cooling oxygen-eliminating device pressure diffuses control system, comprise oxygen-eliminating device, oxygen-eliminating device is provided with pressure unit, PLC and diffusion valve, described pressure unit, diffusion valve are connected with PLC respectively, pressure unit is for measuring the pressure of oxygen-eliminating device, it is characterized in that: the diffusion valve on described oxygen-eliminating device takes small one and large one pneumatic cut-off valve of two nominal diameters, PLC is used for the switch of Stress control two pneumatic cut-off valves recorded by pressure unit.
3. Vaporizing cooling oxygen-eliminating device pressure as claimed in claim 2 diffuses control system, it is characterized in that: described oxygen-eliminating device is also provided with Safety relief valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310107126.4A CN103216819B (en) | 2013-03-29 | 2013-03-29 | Vaporizing cooling oxygen-eliminating device pressure diffuses control method and system thereof |
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| CN201310107126.4A CN103216819B (en) | 2013-03-29 | 2013-03-29 | Vaporizing cooling oxygen-eliminating device pressure diffuses control method and system thereof |
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| CN103216819B true CN103216819B (en) | 2015-09-02 |
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| DE2343217A1 (en) * | 1973-08-28 | 1975-03-06 | Hans Schulze | Boiler feed water automatic control - prevents corrosion, steam wastage and incorrect dosing during shutdown |
| CN102235657A (en) * | 2010-04-26 | 2011-11-09 | 中国神华能源股份有限公司 | Control method for improving reliability of utility boiler |
| CN102650424A (en) * | 2011-06-02 | 2012-08-29 | 章礼道 | Direct-current furnace starting system matched with middle-pressure flash tank and used for comprehensively recycling working medium and heat |
| CN202548670U (en) * | 2011-12-19 | 2012-11-21 | 郑州智慧通测控技术有限公司 | Thermal deoxygenator control system |
| CN203258639U (en) * | 2013-03-29 | 2013-10-30 | 中冶南方工程技术有限公司 | Novel pressure releasing control system for evaporative cooling deaerator |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4354074B2 (en) * | 2000-03-07 | 2009-10-28 | 三菱重工業株式会社 | Deaerator seal steam system equipment |
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2013
- 2013-03-29 CN CN201310107126.4A patent/CN103216819B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2343217A1 (en) * | 1973-08-28 | 1975-03-06 | Hans Schulze | Boiler feed water automatic control - prevents corrosion, steam wastage and incorrect dosing during shutdown |
| CN102235657A (en) * | 2010-04-26 | 2011-11-09 | 中国神华能源股份有限公司 | Control method for improving reliability of utility boiler |
| CN102650424A (en) * | 2011-06-02 | 2012-08-29 | 章礼道 | Direct-current furnace starting system matched with middle-pressure flash tank and used for comprehensively recycling working medium and heat |
| CN202548670U (en) * | 2011-12-19 | 2012-11-21 | 郑州智慧通测控技术有限公司 | Thermal deoxygenator control system |
| CN203258639U (en) * | 2013-03-29 | 2013-10-30 | 中冶南方工程技术有限公司 | Novel pressure releasing control system for evaporative cooling deaerator |
Non-Patent Citations (1)
| Title |
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| 锅炉汽包水位的自动控制应用研究;张辉等;《商场现代化》;20090228(第6期);第22-23页 * |
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