CN104073600A - Steel ladle bottom-blowing air brick pressurization blocking blowing gas supply system and method - Google Patents
Steel ladle bottom-blowing air brick pressurization blocking blowing gas supply system and method Download PDFInfo
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- CN104073600A CN104073600A CN201410226379.8A CN201410226379A CN104073600A CN 104073600 A CN104073600 A CN 104073600A CN 201410226379 A CN201410226379 A CN 201410226379A CN 104073600 A CN104073600 A CN 104073600A
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Abstract
The invention discloses a steel ladle bottom-blowing air brick pressurization blocking blowing gas supply system and method, belonging to the technical field of steelmaking and molten steel refining. The system comprises a gas pressurizer, a cooler, a high-pressure gas storage tank, a bottom-blowing gas holder, a high-pressure gas supply pipeline, a bottom-blowing gas supply pipeline 6, an automatic gas connection device, a check valve, a bottom-blowing air brick, a gas supply pipeline and a fast-cut valve, wherein the gas pressurizer, the cooler and the high-pressure gas storage tank are sequentially connected in series along the gas flow direction and are connected with the high-pressure gas supply pipeline to jointly form a high-pressure blocking blowing gas supply system; the bottom-blowing gas holder is a regulation control unit of the gas supply system and is used for performing pressure regulation, flow regulation and on/off control on the bottom-blowing gas; two gas supply pipelines are arranged in the bottom-blowing gas holder, wherein one is a steel ladle bottom-blowing gas supply pipeline which supplies gas for the normal work of steel ladle bottom blowing, and the other one is an air brick high-pressure blocking blowing gas supply pipeline. The system and method disclosed by the invention have the advantages that the success rate of the steel ladle bottom blowing can be effectively increased so as to prolong the service life of the air brick, reduce the production cost and reduce the labor capacity of the steel ladle maintenance personnel.
Description
Technical field
The invention belongs to steel-making and liquid steel refining technical field, particularly stifled airing system and method are blown in the supercharging of a kind of ladle bottom blowing gas permeable brick.
Background technology
In iron and steel production, steel-making ladle bottom blowing Technology is generally used, it has even molten steel component and temperature, promotion inclusion floating, removes gas, the sufficient critical functions such as liquid steel refining dynamic conditions is provided, as the steel-making such as tapping, ladle argon-blown station, LF ladle refining furnace and RH vacuum-treat after Converter and molten steel refining technology process all adopt ladle bottom blowing operation.Because the ladle of splendid attire molten steel is when each inter process operation of steel-making is shifted, by crane handling, the bottom blowing gas of ladle interrupts, and molten steel infiltrates bottom blowing brick breather hole; In addition, in continuous-casting steel pouring latter stage, sometimes liquid steel temperature is on the low side, molten steel and slag liquid can stick to bottom-blown air brick internal surface, the obstruction of ladle bottom blowing gas permeable brick happens occasionally, and affects normal STEELMAKING PRODUCTION, reduces the work-ing life of bottom-blown air brick, increased the workload that ladle-pot hot-repair and cold repair are safeguarded, so steelmaker author is making great efforts to seek to solve and effectively reduce the method that ladle bottom blowing gas permeable brick stops up always.
Chinese Patent Application No. 201310070272.4 discloses the anti-blocking airing system of a kind of air brick of steel ladle, comprise the gas permeable brick that is arranged on ladle bottom, on gas permeable brick, be connected with flexible pipe, it is characterized in that, on flexible pipe, also order is provided with the first Y-tube and the second Y-tube respectively, first described Y-tube one end connects rapid-acting coupling, the other end is connected with the inlet mouth of breather cheek valve, the air outlet of breather cheek valve connects a gas bag by the 3rd Y-tube, the another port of the 3rd Y-tube is connected with the high-pressure side of proportion expression gas pressure reducer, the other end of the second Y-tube is connected with the low pressure end of proportion expression gas pressure reducer, the prior art provides a kind of technological method that prevents that ladle bottom blowing brick breather hole from stopping up, but in actual use, still there is technological deficiency:
1, in above-mentioned prior art, ladle bottom blowing airing system need to be installed a gas bag within ladle bottom ladle supporting leg, and volume is 7～15L, and this just requires ladle height of landing leg will have enough sizes; And the ladle height of landing leg of existing steelworks is generally in 400～550mm scope, a gas bag is installed, install in addition high temperature protection material additional, ladle bottom space is too little; In addition, due to the requirement of STEELMAKING PRODUCTION, ladle is all furnished with ladle sliding water gap mechanism in bottom, and the ladle of some steel mills is even provided with two cover slide gate mechanisms, and like this, the layout of gas bag can be very difficult.
2, in above-mentioned prior art, the gas bag of a 7～15L of configuration, volume is also less than normal, the time that maintains the ventilation of ladle bottom blowing gas permeable brick is also very limited, these are all limited to by the not enough institute of existing ladle bottom height of landing leg, if increase merely ladle height of landing leg, can cause a series of process for making problems.
Therefore, prior art is applied to actual production and has certain limitation.
Summary of the invention
The object of the present invention is to provide the supercharging of a kind of ladle bottom blowing gas permeable brick to blow stifled airing system and method, solved in ladle bottom blowing production technique, workshop argon gas user point is many, consumption is large, argon gas pipe network hypotony, fluctuate unstable, in addition ladle bottom blowing airing system is anti-blocking blows stifled measure imperfection, causes gas permeable brick to stop up, and the problems such as rate is undesirable are blown out in bottom blowing.
The present invention solves its technical problem, effectively improves ladle bottom blowing and blows out the technological method that rate adopts and be: in ladle bottom blowing airing system, utilize gas pressurization machine to increase by a road high-pressure air source pipeline, be arranged in parallel with ladle bottom blowing pipeline.Utilize the high-pressure gas pressure of high-pressure air source pipeline, blow the breather hole of pass blocking plug, thereby improve the work-ing life of gas permeable brick, reduce the labor capacity that ladle-pot hot-repair burns oxygen cleaning gas permeable brick.
The present invention includes gas pressurization machine 1, water cooler 2, high pressure tank 3, bottom blowing gas holder 4, high-pressure air feed pipeline 5 bottom blowing gas pipelines 6, gas automatic circuit closing device 9, vacuum breaker 11, bottom-blown air brick 12, steam line 13, cut valve 14 soon; Gas pressurization machine 1-water cooler 2-high pressure tank 3 is sequentially connected in series mutually by gas flow direction, is connected with high-pressure air feed pipeline 5, jointly forms high pressure and blows stifled airing system; The regulation unit that bottom blowing gas holder 4 is airing system, Main Function is that bottom blown gas is carried out to pressure adjusting, Flow-rate adjustment and on-off control.In bottom blowing gas holder 4, be provided with two-way supply air line, a road is ladle bottom blowing supply air line 6, for the normal work of ladle bottom blowing provides air feed; Another road is that gas permeable brick high pressure blows stifled supply air line 5.
On ladle steam line 13, be provided with vacuum breaker 11, the inlet end of vacuum breaker 11 communicates with gas automatic circuit closing device (9) by steam line 13, and outlet side communicates with the bottom-blown air brick 12 of ladle 7 bottoms by steam line 13.
High-pressure air feed pipeline of the present invention and bottom blowing gas pipeline are arranged in parallel.In ladle bottom blowing airing system, utilize that gas pressurization machine is in parallel to be increased in the described bottom blowing gas holder of a road high-pressure air source pipeline access after ladle bottom blowing supply air line is cut valve soon.
The interface of giving vent to anger of bottom blowing gas holder of the present invention is installed on the access of ladle bottom blowing gas on the gas automatic circuit closing device on buggy ladle by metallic hose.Ladle handling is put on buggy ladle time, and the bottom blown gas inlet mouth on ladle is connected automatically by the air feed gas circuit on gas automatic circuit closing device and buggy ladle.Described metallic hose launches or draws in the traveling of buggy ladle.
It is as follows that stifled step is blown in gas permeable brick supercharging of the present invention:
A. from the middle pressure bottom blown gas of steelshop pipe network, through gas pressurization machine, be pressurized to certain high pressure grade, gas is stored in high pressure tank after water cooler is cooling, waits for standby;
B. when ladle bottom blowing gas permeable brick air flow is normal, by ladle bottom blowing supply air line, provide normal air feed for ladle bottom blowing; Now on high-pressure air feed pipeline, cut soon valve in closing condition, high-pressure gas circuit is air feed not.
C. stop up when ladle bottom blowing gas permeable brick, when air-flow is smooth, first operator close in watch-keeping cubicle or by machine and cut soon valve on bottom blowing gas pipeline, open again and cut soon valve in high-pressure air feed pipeline, give bottom-blown air brick air feed, utilize high-pressure gas pressure, blow the breather hole of logical bottom-blown air brick; Blow logical after, close and cut soon valve in high-pressure air feed pipeline, stop high-pressure air feed; Finally, then open and cut soon valve on bottom blowing gas pipeline, recover the normal air feed of bottom blowing.
D. the valve interlocking relation of cutting soon in valve and high-pressure air feed pipeline of cutting soon on bottom blowing gas pipeline is cut soon valve when open mode on bottom blowing gas pipeline, cutting soon valve and can not open in high-pressure air feed pipeline; In high-pressure air feed pipeline, cut soon valve when open mode, cutting soon valve and can not open on bottom blowing gas pipeline.
On ladle steam line of the present invention, be provided with vacuum breaker, the inlet end of vacuum breaker automatically connects connection device by steam line and gas and communicates, and outlet side communicates with the bottom-blown air brick of ladle bottom by steam line.
The present invention is for the ladle that is only provided with 1 bottom-blown air brick, described bottom blowing gas pipeline Wei Yi road bottom blowing gas.For the ladle that is provided with 2 bottom-blown air bricks, described bottom blowing gas pipeline can adopt a road bottom blowing gas pipeline bottom blown gas to be caused on the gas automatic circuit closing device of buggy ladle, again after the gas automatic circuit closing device of ladle, be divided into two branch roads, be finally connected to respectively 2 bottom-blown air bricks; Also can adopt two-way bottom blowing pipeline respectively to 2 bottom-blown air brick air feed.
Positively effect of the present invention: effectively improve ladle bottom blowing and blow out rate, improve the work-ing life of gas permeable brick, reduce production costs, reduce ladle maintenance personnel labor capacity.
Accompanying drawing explanation
Fig. 1 is that system facility of the present invention forms schematic diagram.Wherein, gas pressurization machine 1, water cooler 2, high pressure tank 3, bottom blowing gas holder 4, high-pressure air feed pipeline 5, bottom blowing gas pipeline 6, metallic hose 7, ladle 8, gas automatic circuit closing device 9, buggy ladle 10, vacuum breaker 11, bottom-blown air brick 12, steam line 13, cut valve 14 soon.
Embodiment
Fig. 1 is a kind of embodiment of the present invention, below in conjunction with accompanying drawing, is described further:
The present invention includes gas pressurization machine 1, water cooler 2, high pressure tank 3, bottom blowing gas holder 4, high-pressure air feed pipeline 5.Gas pressurization machine 1-water cooler 2-high pressure tank 3 is sequentially connected in series mutually by gas flow direction, is connected with described high-pressure air feed pipeline 5, jointly forms high pressure and blows stifled airing system.In bottom blowing gas holder 4, be provided with two-way supply air line, a road is ladle bottom blowing supply air line 6, and another road is that gas permeable brick high pressure blows stifled supply air line 5.
High-pressure air feed pipeline 5 is arranged in parallel with bottom blowing gas 6 pipelines.In ladle bottom blowing airing system, utilize in parallel increase in a road high-pressure air source pipeline access bottom blowing gas holder 4 of gas pressurization machine 1 to cut soon valve (14) afterwards on ladle bottom blowing supply air line (6).
Ladle 8 is provided with 2 bottom-blown air bricks 12, and bottom blowing gas pipeline 6 adopts two-way bottom blowing pipeline respectively to 2 bottom-blown air brick 12 air feed.
On the steam line 13 of ladle, be provided with vacuum breaker 11, the inlet end of vacuum breaker 11 automatically connects connection device 9 by steam line 13 and gas and communicates, and outlet side communicates with the bottom-blown air brick 12 of ladle 7 bottoms by steam line 13.
The interface of giving vent to anger of bottom blowing gas holder 4 is installed on the access of ladle bottom blowing gas on the gas automatic circuit closing device 9 on buggy ladle 10 by metallic hose 7.Ladle 8 handlings are put on buggy ladle 10 time, and the bottom blown gas inlet mouth on ladle 8 is connected automatically by gas automatic circuit closing device 9 and the air feed gas circuit on buggy ladle 10.
It is as follows that stifled step is blown in gas permeable brick supercharging:
A. from middle pressure (P=1.6MPa) bottom blown gas of steelshop pipe network, through gas pressurization machine 1, be pressurized to 3.0MPa, gas is stored in high pressure tank 3 after water cooler cooling 2, waits for standby.High pressure tank 3 volumes are 4m
3.
B. when ladle bottom blowing gas permeable brick 12 air flows are when normal, by ladle bottom blowing supply air line 6, provide normal air feed for ladle bottom blowing; Now on high-pressure air feed pipeline 5, cut soon valve 14 in closing condition, high-pressure gas circuit is air feed not.
C. when ladle bottom blowing gas permeable brick 12 stops up, when air-flow is not smooth, operator in watch-keeping cubicle or other first the closing of machine on bottom blowing gas pipeline 6, cut soon valve 14, open again and cut soon valve 14 in high-pressure air feed pipeline 5, give bottom-blown air brick 12 air feed, utilize high-pressure gas pressure, blow the breather hole of logical bottom-blown air brick 12; Blow logical after, close and cut soon valve 14 in high-pressure air feed pipeline 5, stop high-pressure air feed; Finally, then open and cut soon valve 14 on bottom blowing gas pipeline 6, recover the normal air feed of bottom blowing.
Claims (5)
1. stifled airing system is blown in ladle bottom blowing gas permeable brick supercharging, it is characterized in that, comprise gas pressurization machine (1), water cooler (2), high pressure tank (3), bottom blowing gas holder (4), high-pressure air feed pipeline (5), bottom blowing gas pipeline (6), gas automatic circuit closing device (9), vacuum breaker (11), bottom-blown air brick (12), steam line (13), cut valve (14) soon; Gas pressurization machine (1)-water cooler (2)-high pressure tank (3) is sequentially connected in series mutually by gas flow direction, is connected with high-pressure air feed pipeline (5), jointly forms high pressure and blows stifled airing system; The regulation unit that bottom blowing gas holder (4) is airing system, effect is that bottom blown gas is carried out to pressure adjusting, Flow-rate adjustment and on-off control; Bottom blowing gas holder is provided with two-way supply air line in (4), and a road is ladle bottom blowing supply air line (6), for the normal work of ladle bottom blowing provides air feed; Another road is that gas permeable brick high pressure blows stifled supply air line (5);
On ladle steam line (13), be provided with vacuum breaker (11), the inlet end of vacuum breaker (11) communicates with gas automatic circuit closing device (9) by steam line (13), and outlet side communicates with the bottom-blown air brick (12) of ladle (7) bottom by steam line (13).
2. system according to claim 1, is characterized in that, high-pressure air feed pipeline (5) is arranged in parallel with bottom blowing gas (6) pipeline; In ladle bottom blowing airing system, utilize in parallel increase in a road high-pressure air source pipeline access bottom blowing gas holder (4) of gas pressurization machine (1) to cut soon valve (14) afterwards on ladle bottom blowing supply air line (6).
3. system according to claim 1, it is characterized in that, the interface of giving vent to anger of described bottom blowing gas holder (4) is installed on the access of ladle bottom blowing gas on the gas automatic circuit closing device (9) on buggy ladle (10) by metallic hose (7); Ladle (8) handling is put while going up to buggy ladle (10), and the bottom blown gas inlet mouth on ladle (8) is connected automatically by gas automatic circuit closing device (9) and the air feed gas circuit on buggy ladle (10); Described metallic hose (7) launches or draws in the traveling of buggy ladle (10).
4. a blocking method is blown in the gas permeable brick supercharging of airing system claimed in claim 1, it is characterized in that, processing step is as follows:
A. from the middle pressure bottom blown gas of steelshop pipe network, through gas pressurization machine (1), be pressurized to certain high pressure grade, gas is stored in high pressure tank (3) after water cooler cooling (2), waits for standby;
B. when ladle bottom blowing gas permeable brick (12) air flow is normal, by ladle bottom blowing supply air line (6), provide normal air feed for ladle bottom blowing; Now on high-pressure air feed pipeline (5), cut soon valve (14) in closing condition, high-pressure gas circuit is air feed not;
C. when ladle bottom blowing gas permeable brick (12) stops up, when air-flow is not smooth, first close and cut soon valve (14) on bottom blowing gas pipeline (6), open again and cut soon valve (14) in high-pressure air feed pipeline (5), give bottom-blown air brick (12) air feed, utilize high-pressure gas pressure, blow the breather hole of logical bottom-blown air brick (12); Blow logical after, close and cut soon valve (14) in high-pressure air feed pipeline (5), stop high-pressure air feed; Finally, then open and cut soon valve (14) on bottom blowing gas pipeline (6), recover the normal air feed of bottom blowing.
5. method according to claim 4, it is characterized in that, valve (14) the interlocking relation of cutting soon in valve (14) and high-pressure air feed pipeline (5) of cutting soon on bottom blowing gas pipeline (6), on bottom blowing gas pipeline (6) cut soon valve (14) in open mode time, cutting soon valve (14) and can not open in high-pressure air feed pipeline (5); In high-pressure air feed pipeline (5) cut soon valve (14) in open mode time, cutting soon valve (14) and can not open on bottom blowing gas pipeline (6).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410226379.8A CN104073600A (en) | 2014-05-24 | 2014-05-24 | Steel ladle bottom-blowing air brick pressurization blocking blowing gas supply system and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410226379.8A CN104073600A (en) | 2014-05-24 | 2014-05-24 | Steel ladle bottom-blowing air brick pressurization blocking blowing gas supply system and method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110976835A (en) * | 2019-10-31 | 2020-04-10 | 张家港宏昌钢板有限公司 | Visual workshop for hot repair of steel ladle air brick and operation method thereof |
| CN111266565A (en) * | 2020-02-17 | 2020-06-12 | 本钢板材股份有限公司 | Ladle air brick blowing and blocking system and method |
| CN111644584A (en) * | 2020-07-25 | 2020-09-11 | 莱芜钢铁集团银山型钢有限公司 | Soft blowing method and control device for bottom blowing argon of continuous casting ladle turret |
| CN111876550A (en) * | 2020-06-29 | 2020-11-03 | 武汉钢铁有限公司 | Method and device for controlling furnace bottom gas supply of top-bottom combined blown converter |
| CN115446296A (en) * | 2022-09-15 | 2022-12-09 | 北京瓦特曼智能科技有限公司 | Steel ladle hot repair system and steel ladle hot repair method |
| CN117821694A (en) * | 2023-12-27 | 2024-04-05 | 钢铁研究总院有限公司 | High-regulation-ratio flow control valve bank for converter bottom blowing and air supply method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2384710Y (en) * | 1999-08-10 | 2000-06-28 | 石家庄钢铁有限责任公司 | Refining bottom argon-blown steel ladle |
| CN2839298Y (en) * | 2005-08-26 | 2006-11-22 | 西安重型机械研究所 | Automatic regulator for steel ladle bottom argon-blowing system |
| CN103100705A (en) * | 2013-03-06 | 2013-05-15 | 济南鲁东耐火材料有限公司 | Anti-clogging air supply system of permeable brick for ladle |
-
2014
- 2014-05-24 CN CN201410226379.8A patent/CN104073600A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2384710Y (en) * | 1999-08-10 | 2000-06-28 | 石家庄钢铁有限责任公司 | Refining bottom argon-blown steel ladle |
| CN2839298Y (en) * | 2005-08-26 | 2006-11-22 | 西安重型机械研究所 | Automatic regulator for steel ladle bottom argon-blowing system |
| CN103100705A (en) * | 2013-03-06 | 2013-05-15 | 济南鲁东耐火材料有限公司 | Anti-clogging air supply system of permeable brick for ladle |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110976835A (en) * | 2019-10-31 | 2020-04-10 | 张家港宏昌钢板有限公司 | Visual workshop for hot repair of steel ladle air brick and operation method thereof |
| CN111266565A (en) * | 2020-02-17 | 2020-06-12 | 本钢板材股份有限公司 | Ladle air brick blowing and blocking system and method |
| CN111876550A (en) * | 2020-06-29 | 2020-11-03 | 武汉钢铁有限公司 | Method and device for controlling furnace bottom gas supply of top-bottom combined blown converter |
| CN111644584A (en) * | 2020-07-25 | 2020-09-11 | 莱芜钢铁集团银山型钢有限公司 | Soft blowing method and control device for bottom blowing argon of continuous casting ladle turret |
| CN115446296A (en) * | 2022-09-15 | 2022-12-09 | 北京瓦特曼智能科技有限公司 | Steel ladle hot repair system and steel ladle hot repair method |
| CN115446296B (en) * | 2022-09-15 | 2024-02-06 | 北京瓦特曼智能科技有限公司 | Ladle hot repair system and ladle hot repair method |
| CN117821694A (en) * | 2023-12-27 | 2024-04-05 | 钢铁研究总院有限公司 | High-regulation-ratio flow control valve bank for converter bottom blowing and air supply method |
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