CN102796848B - Valveless control loop for full-steam vacuum distillation (VD) vacuum refining furnace - Google Patents
Valveless control loop for full-steam vacuum distillation (VD) vacuum refining furnace Download PDFInfo
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- CN102796848B CN102796848B CN201210269895XA CN201210269895A CN102796848B CN 102796848 B CN102796848 B CN 102796848B CN 201210269895X A CN201210269895X A CN 201210269895XA CN 201210269895 A CN201210269895 A CN 201210269895A CN 102796848 B CN102796848 B CN 102796848B
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Abstract
The invention provides a valveless control loop for a full-steam vacuum distillation (VD) vacuum refining furnace, which comprises a three-stage main pump, a first condenser and three steam pump branches which are respectively connected with the three-stage main pump and the first condenser and are connected with one another in parallel, wherein the three steam pump branches which are connected with one another in parallel are respectively a start-stage loop, an auxiliary exhaust loop and a main exhaust loop; the main exhaust loop comprises a first auxiliary pump, a second condenser, a second auxiliary pump and a discharge-stage condenser which are sequentially arranged; the auxiliary exhaust loop comprises a third auxiliary pump, a third condenser and a fourth auxiliary pump which are sequentially arranged; and the start-stage loop comprises a start-stage steam pump. After the valveless control loop for the full-steam VD vacuum refining furnace is adopted, the investment is saved, the fault hidden trouble caused by an exhaust loop steam cut-off valve can be completely eliminated, a full-steam VD vacuum refining furnace system can run reliably for a long time, and a vacuum tight pipeline system is free from maintenance.
Description
Technical field
The present invention relates to technical field of ferrous metallurgy, specifically, the present invention relates to a kind of no-valve control loop of pressure decatizing vapour VD vacuum refining furnace.
Background technology
For pressure decatizing vapour VD vacuum refining furnace, the vapour pump branch road of three parallel connections is set usually, to improve the exhaust capacity in the stage of bleeding in advance, rapidly the waste gas in pipeline liquid injecting device is got rid of.
Fig. 1 shows the schematic diagram that the valve control loop is arranged according to the pressure decatizing vapour VD vacuum refining furnace of conventional art.
With reference to Fig. 1, the vapour pump branch road that is three parallel connections according to the control loop of the pressure decatizing vapour VD vacuum refining furnace of conventional art.Specifically, in Fig. 1, B1, B2, B3 are three grades of main pumps; E4a-E4b, E5a-E5b are two-way service pump in parallel; Ec is for starting the level vapour pump; VE4b, VE5b, VEc are the steam stop valve in control loop; C1, C2 are condenser; AC is discharge level condenser.
As shown in Figure 1, the vapour pump branch road that comprises three parallel connections according to the control loop of the pressure decatizing vapour VD vacuum refining furnace of conventional art: a loop consists of E4a and E5a; The b loop, consist of VE4b, E4b, VE5b and E5b; The Ec loop, consist of VEc and Ec.Specifically, a loop is open in usual, in whole pumping process, all in opened condition, does not need valve to control; The b loop pump is only in the stage work of bleeding in advance, and when main pump B3 opens, whole b just closes in loop; The Ec loop is for starting the level loop, and only operation when system starts is closed when E4b opens.In conventional art, the common way of the keying in b loop is vacuum control check valve to be installed in loop to realize automatic open close, because the failure rate of reverse checkvalve is too high, developing into afterwards Pneumatic butterfly valve controls, effectively to reduce failure rate, but the generation of fault still can't be eradicated in the b loop that adopts Pneumatic butterfly valve to control.
In addition, in the control loop of the vapour of the pressure decatizing according to conventional art VD vacuum refining furnace as shown in Figure 1, due to the existence of steam stop valve VE4b, VE5b, VEc, in actual production process failure rate performance higher, exist spool to be not closed completely, to close the situations such as breakdown action response lag.In addition, when the vapour pump in Ec loop and b loop quits work, easily cause vacuum leak; Yet, because control loop belongs to huger closed system, steam stop valve leak detection difficulty is larger, so easily cause the abnormal of whole system work.
Therefore, the control loop of needing badly the pressure decatizing vapour VD vacuum refining furnace of prior art is improved.
Summary of the invention
In order to solve at least one the above-mentioned problem existed in prior art, the invention provides a kind of control loop without the valvular pressure decatizing vapour of tool VD vacuum refining furnace.
According to an aspect of the present invention, a kind of no-valve control loop of pressure decatizing vapour VD vacuum refining furnace is provided, the no-valve control loop of described pressure decatizing vapour VD vacuum refining furnace comprises three grades of main pumps, the vapour pump branch road of the first condenser and three parallel connections being connected with the first condenser with three grades of main pumps, the vapour pump branch road of described three parallel connections is for starting the level loop, auxiliary loop and the main loop of bleeding of bleeding, wherein, described master bleeds loop by the first service pump sequentially arranged, the second condenser, the second service pump and discharge level condenser form, the 3rd service pump that the described auxiliary loop of bleeding is arranged by order, the 3rd condenser and the 4th service pump form, described startup level loop forms by starting the level vapour pump.
According to the present invention, the no-valve control loop of described pressure decatizing vapour VD vacuum refining furnace can also comprise the first water-cooled blow down separator that is connected to described startup level loop and the second water-cooled blow down separator that is connected to the described loop of bleeding in advance.
According to the present invention, described the first water-cooled blow down separator and described the second water-cooled blow down separator can be connected to the hot well water seal tank and be arranged in below the liquid level of water of hot well water seal tank.
No-valve control loop by pressure decatizing vapour VD vacuum refining furnace of the present invention, can reduce investment outlay, thoroughly eliminate the potential faults that steam stop valve brings, pressure decatizing vapour VD vacuum refinement furnace system is moved reliably and with long-term, realized the non-maintaining of vacuum seal piping system.
The accompanying drawing explanation
Comprise that accompanying drawing provides further understanding, and accompanying drawing is incorporated in this manual and forms the part of this specification sheets.Accompanying drawing shows exemplary embodiment, and is used for together with the description explaining the principle of inventive concept.In the accompanying drawings:
Fig. 1 shows the schematic diagram that the valve control loop is arranged according to the pressure decatizing vapour VD vacuum refining furnace of conventional art;
Fig. 2 shows the schematic diagram according to the no-valve control loop of pressure decatizing vapour VD vacuum refining furnace of the present invention.
Embodiment
In the control loop of the pressure decatizing vapour VD vacuum refining furnace according to conventional art, due to the existence of steam stop valve VE4b, VE5b, VEc, make failure rate higher, easily cause vacuum leak.In order to solve problems of the prior art, the present invention proposes the loop that does not utilize valve to be bled and control.Specifically, according to the present invention, valve in the control loop of the pressure decatizing vapour VD vacuum refining furnace of conventional art is completely abolished, principle by vacuum, rely on water to realize selfsealings under negative pressure state, therefore, the problem that failsafe valve takes place frequently will obtain revolutionary solution, and the serviceability of whole VD vacuum pump system also will get a qualitative improvement.
Hereinafter, carry out with reference to the accompanying drawings to describe more fully the present invention, shown in the drawings of exemplary embodiment of the present invention.In whole specification sheets, use identical label to mean identical element.
Describe the no-valve control loop according to pressure decatizing vapour VD vacuum refining furnace of the present invention in detail below in conjunction with accompanying drawing.
Fig. 2 shows the schematic diagram according to the no-valve control loop of pressure decatizing vapour VD vacuum refining furnace of the present invention.
The no-valve control loop of the pressure decatizing vapour VD vacuum refining furnace shown in Fig. 2 is the improvement that the valve control loop is arranged to the vapour of the pressure decatizing according to conventional art VD vacuum refining furnace as shown in Figure 1.
With reference to Fig. 2, according to the no-valve control loop of pressure decatizing vapour VD vacuum refining furnace of the present invention, comprise three main pumps, three condensers, four service pumps, a discharge level condenser and two water-cooled blow down separators.Therefore, different from the control loop of the vapour of the pressure decatizing according to the conventional art VD vacuum refining furnace shown in Fig. 1 is, according to the condenser in the no-valve control loop of pressure decatizing vapour VD vacuum refining furnace of the present invention, be three, and this no-valve control loop also comprise two water-cooled blow down separators.
Specifically, as shown in Figure 2, the vapour pump branch road that comprises three parallel connections that all are connected with B3 and the first condenser C1 with three grades of main pump B1, B2 according to the no-valve control loop of pressure decatizing vapour VD vacuum refining furnace of the present invention, lead the loop (a loop) of bleeding, auxiliary loop (b loop) and the startup level loop (Ec loop) of bleeding, wherein, the first service pump E4a, the second condenser C2 that a loop is arranged by order, the second service pump E5a and discharge level condenser AC form, the a loop is open in usual, in whole pumping process always in opened condition; The 3rd service pump E4b, the 3rd condenser C3 and the 4th service pump E5b that the b loop is arranged by order form, and stage work is only being taken out in advance in the b loop, and when main pump B3 opens, the b loop just quits work in closing condition; The Ec loop forms by starting level vapour pump Ec, and for starting the level loop, only Ec loop operation when system starts, after the normal operation of system, the Ec loop is closed thereupon.
In addition, according to the present invention, start level loop (Ec loop) and assist the loop (b loop) of bleeding also to be connected respectively to water-cooled blow down separator PX
1and PX
2.With reference to Fig. 2, the first water-cooled blow down separator PX
1be connected to and start the level loop, make the pumped gas produced in starting loop via the first water-cooled blow down separator PX
1directly be discharged in thermal well; The second water-cooled blow down separator PX
2be connected to the auxiliary loop of bleeding, make the pumped gas produced in the auxiliary loop of bleeding via the second water-cooled blow down separator PX
2directly be discharged in thermal well.Because the water-cooled blow down separator directly immerses below the water seal tank liquid level, can rapidly the high-temperature steam of extraction be condensed into to liquid water, by the water-fast gas sharp separation be drawn out of, simultaneously due to the shielding effect of separator, even high velocity air inspires stronger water impact and also can not destroy the selfsealings of vacuum when b road and Ec loop works.
With reference to Fig. 2, water-cooled blow down separator PX
1and PX
2be immersed in the degree of depth that the water seal tank liquid level is suitable with the next one (for example, the predetermined degree of depth), to bring into play fully its self sealing action.The water seal tank liquid level refers to the liquid level of water in the hot well water seal tank.Here, hot well water seal tank (not shown) is a building block in hot well device, and specifically, hot well device is the hot well devices of those skilled in the art known to usually, comprises the building blocks such as hot well water seal tank, hot well pump, hot well blower fan.The hot well water seal tank provides water seal and receives the water coolant that the vacuum pump condenser is discharged for the vacuum pump condenser.
Therefore, according to the control loop of pressure decatizing vapour VD vacuum refining furnace of the present invention without being controlled by valve.With the valve control loop that has of the pressure decatizing vapour VD vacuum refining furnace shown in Fig. 1, compare, saved steam stop valve VE4b, VE5b, the VEc in Fig. 1 according to the control loop of pressure decatizing vapour VD vacuum refining furnace of the present invention, former condenser C2 is resolved into to two less condenser C2, C3, b loop and Ec loop is independent, and by the pumped gas of its generation process water-cooled blow down separator PX
1and PX
2directly be discharged in thermal well, when the pump in Ec loop and b loop quits work, because system has formed the certain vacuum degree, rely on the water column of voltage rise under negative pressure just can realize reliable vacuum-sealing.Here, the effect of condenser is to improve the efficiency of rear class squirt pump by the vapor condensation Cheng Shui of forepump discharge.
In order to explain better the present invention, the working method according to the no-valve control loop of pressure decatizing vapour VD vacuum refining furnace of the present invention is described below with reference to accompanying drawings.
At first, according to the requirement of system in combination, service pump E5a, E5b and vapour pump Ec pump need to be opened simultaneously, in order to rapidly the waste gas in pipeline is discharged.Now, the gas that extract out in b loop and Ec loop is through water-cooled blow down separator PX
1and PX
2directly enter among thermal well, the gas that a loop produces directly enters atmosphere through discharge level condenser AC.(for example,, in the time of 27KPa), unlatching service pump E4a, E4b close the Ec pump, now the first water-cooled blow down separator PX simultaneously to treat to be down to predetermined vacuum level from normal atmosphere by the system vacuum degree
1rely on water to realize selfsealings, the second water-cooled blow down separator PX
2expellant gas continues to enter among thermal well, and the gas that a loop produces enters atmosphere through discharge level condenser AC.The pump of this stage in opening is E5a, E5b, E4a, E4b, and the pump of cutting out is Ec.
Then, continue to drop to predetermined vacuum level (for example,, 8KPa) time when the system vacuum degree, open main pump B3 again, cut off service pump E5b, E4b simultaneously, now the b loop stops fully, because system has produced larger negative pressure, cooled type separator relies on suction water column to realize selfsealings.The pump of this stage in opening is B3, E4a, E5a, and the pump of cutting out is Ec, E4b, E5b.
Subsequently, for example, when the system vacuum degree (reaches predetermined vacuum level, 2.2KPa) time open main pump B2, for example, when the system vacuum degree (reaches predetermined vacuum tightness, open main pump B1 in the time of 480Pa), for example, until the vacuum tightness that the system vacuum degree reaches expectation (, 67Pa), now pump B1, B2, B3, E4a, E5a are in running status, through bleeding and the condensation operation of condenser C1, C2 and discharge level condenser AC of master loop, fully the gas in pressure decatizing vapour VD system is discharged, this combination is up to the metallurgical reaction that completes molten steel, till reaching metallurgical degassed requirement.B loop and Ec loop be all the time in off state, water-cooled blow down separator PX
1, PX
2in water column selfsealings state.
Therefore, according to the present invention, the control loop of this valveless of pressure decatizing vapour VD vacuum refining furnace, utilized dexterously normal atmosphere self principle to realize oneself's sealing of vacuum loop, saved investment, thoroughly eliminated the potential faults that steam stop valve brings, made the operation of whole system realize non-maintaining, this technology impels the serviceability of pressure decatizing vapour VD system significantly to improve, pressure decatizing vapour VD vacuum refining furnace manufacture and design industry in good promotion prospect is arranged.
Although with reference to exemplary embodiment of the present invention, specifically illustrate and described the present invention, but it should be understood by one skilled in the art that, in the situation that do not break away from the spirit and scope of the present invention that limited by claim and equivalent thereof, can make the change on various forms and details at this.
Claims (1)
1. the no-valve control loop of a pressure decatizing vapour VD vacuum refining furnace, the no-valve control loop that it is characterized in that described pressure decatizing vapour VD vacuum refining furnace comprises three grades of main pumps, the vapour pump branch road of the first condenser and three parallel connections being connected with the first condenser with three grades of main pumps, the vapour pump branch road of described three parallel connections is for starting the level loop, auxiliary loop and the main loop of bleeding of bleeding, wherein, described master bleeds loop by the first service pump sequentially arranged, the second condenser, the second service pump and discharge level condenser form, the 3rd service pump that the described auxiliary loop of bleeding is arranged by order, the 3rd condenser and the 4th service pump form, described startup level loop forms by starting the level vapour pump,
Wherein, the no-valve control loop of described pressure decatizing vapour VD vacuum refining furnace also comprises the first water-cooled blow down separator that is connected to described startup level loop and the second water-cooled blow down separator that is connected to the described auxiliary loop of bleeding, wherein, described the first water-cooled blow down separator and described the second water-cooled blow down separator are connected to the hot well water seal tank and are arranged in below the liquid level of water of hot well water seal tank.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210269895XA CN102796848B (en) | 2012-07-31 | 2012-07-31 | Valveless control loop for full-steam vacuum distillation (VD) vacuum refining furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210269895XA CN102796848B (en) | 2012-07-31 | 2012-07-31 | Valveless control loop for full-steam vacuum distillation (VD) vacuum refining furnace |
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| Publication Number | Publication Date |
|---|---|
| CN102796848A CN102796848A (en) | 2012-11-28 |
| CN102796848B true CN102796848B (en) | 2013-12-11 |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08283827A (en) * | 1995-04-10 | 1996-10-29 | Nippon Steel Corp | Vacuum, evacuating device for refining furnace with low degree of vacuum |
| US6294005B1 (en) * | 1998-09-22 | 2001-09-25 | Asahi Glass Company Ltd. | Vacuum gas releasing system |
| CN101503749B (en) * | 2009-03-19 | 2010-10-06 | 宝钢工程技术集团有限公司 | Vacuum degasification system steam jet and last stage pressure air injection vacuum technology |
| CN201501904U (en) * | 2009-08-26 | 2010-06-09 | 宝山钢铁股份有限公司 | Vacuum regulating device for vacuum refining furnace |
| CN202744589U (en) * | 2012-07-31 | 2013-02-20 | 莱芜钢铁集团有限公司 | Valveless control loop of full steam vacuum decarburization (VD) furnace |
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