CN100549188C - Molten steel refining vacuum channel standby preheating device and method - Google Patents
Molten steel refining vacuum channel standby preheating device and method Download PDFInfo
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- CN100549188C CN100549188C CNB2006100272016A CN200610027201A CN100549188C CN 100549188 C CN100549188 C CN 100549188C CN B2006100272016 A CNB2006100272016 A CN B2006100272016A CN 200610027201 A CN200610027201 A CN 200610027201A CN 100549188 C CN100549188 C CN 100549188C
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Abstract
The invention belongs to the liquid steel refining technical field, be specially a kind of RH molten steel refining vacuum channel standby pre-heating mean and device, mainly by preheating rifle rifle body, the lifting of preheating rifle, rotation and urgent lifting mechanism, portfire and flame detecting device, monoblock type burning control valve station, pipeline and metallic hose assembly and PLC automatic control system are formed, monoblock type burning control valve station is connected by the preheating rifle of many metallic hoses with liftable and rotation, the scene is provided with 1 and is used for the lifting of preheating rifle, rotation, the execute-in-place case that purges and light a fire, whole device is finished automatic detection and control by PLC.This device has simple in structure, and is easy and simple to handle, safe and reliable, and the igniting hit rate reaches 100%, and is effective to the intensification and the heat-insulation preheating processing efficiency height of vacuum tank, can satisfy the requirement of RH liquid steel refining production to the vacuum tank thermal pretreatment fully.
Description
Technical field
The invention belongs to the liquid steel refining technical field, be specifically related to treat the device and method that the seat in the plane vacuum tank carries out thermal pretreatment in a kind of molten steel vacuum refinement (RH) system.
Background technology
RH molten steel vacuum refining system need be treated the seat in the plane when producing vacuum tank heats up or the heat-insulation preheating processing, is being used for having certain temperature when the molten steel vacuum refinement is handled to guarantee vacuum tank.The vacuum tank of in the past treating the seat in the plane generally adopts electrode or side burner mode to carry out thermal pretreatment, but the preheating method of this fixed position can make the inner Heating temperature of vacuum tank inhomogeneous, the thermal pretreatment efficient of vacuum tank is low, weak effect, and cause vacuum tank short work-ing life.From the congenerous product cost height of external introduction, complex structure, operate loaded down with trivial details, and the igniting hit rate low, safety performance is not high.
Summary of the invention
The objective of the invention is to propose that a kind of thermal pretreatment is effective, igniting hit rate and high molten steel refining vacuum channel standby preheating device and the method for reliability.
The molten steel refining vacuum channel standby preheating device that the present invention proposes, its structured flowchart as shown in Figure 1.Specifically form by preheating rifle 1, preheating rifle motion control mechanism 2, portfire 3, flame detecting device 4, vacuum tank 5, vacuum tank temperature-detecting device 6, monoblock type burning control valve station 7, intermediate connection tube road 8, metallic hose assembly 9 and PLC automatic control system 10.Monoblock type burning control valve station 7 is connected by the preheating rifle 1 of many metallic hoses with liftable and rotation, and the scene is provided with 1 execute-in-place case 11 that is used to control the lifting of preheating rifle, rotation, purging and igniting, and whole device is finished automatic detection and control by PLC.Wherein, portfire 3 adopts common burning torch XE, flame detecting device 4 adopts highly sensitive aperture adjustable type flame detector XT, preheating rifle controlling organization 2 by up and-down motor EM, rotation is with electronic cylinder CM and promptly promote motor AM and form, the preheating rifle adopts electric lift EM and electronic rotating cylinder CM (electronic rotating cylinder CM is regulated by rotary encoder LT) under standard state, in case of emergency adopt to promote motor AM; Inseparable chamber system valve station by many groups valve, pipeline, flow transmitter, pressure unit, limit switch etc. through connecting to form, and the corresponding respectively instrument air pipe 12 that connects, compressed air pipe 13, purge nitrogen tube 14, gas line 15, burning blower fan 16, help and burn oxygen hose 17, in addition, also be used for hydronic water coolant turnover pipe 18 and 19 and be communicated with.
In monoblock type burning control valve station 7, the pipeline that is communicated with instrument air pipe 12 adopts DN25, and pipeline is provided with tensimeter PI, pressure switch PS and a series of pneumatic control valve; The pipeline that is communicated with compressed air pipe 13 adopts DN25, and pipeline is provided with tensimeter PI, pressure switch PS, and be connected with the emergency pneumatic motor; The pipeline that is communicated with purging air pipe 14 adopts DN20, is provided with tensimeter PI, pressure switch PS, magnetic valve SV on the pipeline successively; The pipeline that is communicated with gas line 15 adopts DN80, be provided with tensimeter PI, pressure switch PS, flow transmitter FT, flow control valve PCV, pneumatic cut-off valve FV, tensimeter PI on the pipeline successively, other is provided with bypass: comprise a pneumatic cut-off valve FV and two control valves: the pipeline that is communicated with combustion air pipe (blower fan) 16 adopts DN200, is provided with tensimeter PI, pressure switch PS, flow transmitter FT, flow control valve PCV, pneumatic cut-off valve FV, tensimeter PI on the pipeline successively; The pipeline that is communicated with cooling water inlet pipe 18 adopts DN80, is provided with tensimeter PI, pressure switch PS, temperature transmitter TT, flow transmitter FT, pneumatic cut-off valve FV on the pipeline successively; The pipeline that is communicated with CWR 19 adopts DN80, is provided with tensimeter PI, temperature transmitter TT, flow transmitter FT on the pipeline successively; Above-mentioned various pipeline, comprise that instrument air pipe, compressed air pipe, purging nitrogen tube, natural gas tube, combustion air pipe, combustion-supporting oxygen hose, cooling water inlet pipe and return water pipe all pass through the intermediate connection tube road and be communicated with preheating rifle rifle body respectively, correspondence is provided with various pressure switch PS on the rifle body.
This device main energy sources medium and purposes are: be used for the instrument air 12 that pneumatic control valve drives, be used for the pressurized air 13 that pneumatic motor drives and flame detector purges, the nitrogen 14 that is used for purge gas channel, be used for combustion-supporting oxygen 15, be used for incendiary air 16, combustion gas (can use Sweet natural gas or coke-oven gas) 17, and preheating gun cooling water.
The method of manipulating of this device is: when needs heat up or the vacuum tank 5 that is incubated processing when moving to the standby preheating position, the PLC Controlling System is after entry condition such as automatically confirm that the energy medium state is normal, the burning fan operation is normal and gearing control device is normal, operator's operation site operation box 11 rotates to preheating rifle 1 by controlling organization 2 and handles the position, and drops in the vacuum tank 5.Then, operator's nitrogen purging program at the scene or before the central control chamber starting ignition, nitrogen purging is closed automatically after continuously purging 1～2 minute; 1～2 minute subsequently inherent same position starting ignition program; Behind the starting ignition button, automatically open bypass igniting combustion gas, automatic setting combustion air igniting flow, automatically triggering the high pressure spot firelock simultaneously lights a fire, detect flare up fire if in 20 seconds, (can specifically set) flame detector as required, the PLC Controlling System can enter the program that heats up or be incubated the burning master mode, otherwise starts the nitrogen purging program automatically; After lighting a fire successfully, operator select to heat up on operation screen according to the vacuum tank preheating requirement or insulation burning master mode; When taking place to satisfy chain safety condition in vacuum tank intensification or the insulation treating processes, or after the normal processing end, close process of combustion automatically, the automatic simultaneously nitrogen purging program that starts; In intensification or preservation and controlling pattern, combustion gas and combustion air carry out automatic ratio control, when combustion gas reaches certain flow, start combustion-supporting oxygen automatically, carry out automatic ratio control simultaneously.When the preheating rifle can not the electricity consumption flowing mode normally rises, can start pneumatic motor and carry out the preheating rifle and promptly promote.
Technical characterstic of the present invention is: the preheating rifle adopts electric up-down and rotation mode under standard state, in case of emergency adopt pneumatic motor to carry out urgent hoisting way, adopt the mode at monoblock type burning control valve station, flame detects and adopts highly sensitive aperture regulative mode, adopts combustion gas bypass sparking mode; Adopt preheating gun cooling water compound detection and chain control mode, the safe combustion control mode of employing igniting, burning and purging loop structure adopts vacuum tank intensification or insulation burning master mode etc.
This device has simple in structure, and is easy and simple to handle, safe and reliable, and the igniting hit rate reaches 100%, and is effective to the intensification and the heat-insulation preheating processing efficiency height of vacuum tank, can satisfy the requirement of RH liquid steel refining production to the vacuum tank thermal pretreatment fully.
Description of drawings
Fig. 1 is apparatus of the present invention structured flowchart.
Fig. 2 is 150 tons of RH molten steel refining vacuum channel standby preheating device process flow sheets, is a kind of typical process scheme diagram that adopts Sweet natural gas to carry out the vacuum tank thermal pretreatment as combustion gas.
Fig. 3 is 300 tons of RH molten steel refining vacuum channel standby preheating device process flow sheets, is a kind of typical process scheme diagram that adopts coke-oven gas to carry out the vacuum tank thermal pretreatment as combustion gas.
Number in the figure: 1 is the preheating rifle, 2 is controlling organization, 3 is portfire, and 4 is flame detector, and 5 is vacuum tank, 6 is the vacuum tank temperature-detecting device, 7 are monoblock type burning control valve station, and 8 is the intermediate connection tube road, and 9 is the metallic hose assembly, 10 is the PLC automatic control system, 11 is the execute-in-place case, and 12 is the instrument air pipe, and 13 is compressed air pipe, 14 for purging nitrogen tube, 15 is gas line, and 16 is combustion air pipe (blower fan), and 17 is combustion-supporting oxygen hose, 18 is cooling water inlet pipe, and 19 is CWR.PI one tensimeter, PS one pressure switch, PT one pressure unit, TE one pyrometer couple, TT one temperature transmitter, FT one flow transmitter, FCV one flow control valve, PCV one pressure regulator valve, FV one pneumatic cut-off valve, SV one magnetic valve, LS one limit switch, LT one rotary encoder, XT one flame detector, XE one burning torch, FM one burning blower fan, EM one up and-down motor, the electronic cylinder of CM one rotation, AM one urgent pneumatic motor, the LP one execute-in-place case of promoting.
Embodiment
Be two kinds of typical process schemes of the present invention below.
First kind is to adopt the 150 ton RH molten steel refining vacuum channel standby preheating devices of Sweet natural gas as combustion gas, and as shown in Figure 2, its main technique design data is as follows: vacuum tank 5 pre-heating temperature elevation speed are 50 ℃/hour, and maximum heating temperature is 1200 ℃; 10 meters of preheating rifle 1 maximum lifting travels; The Sweet natural gas peak flow is 400Nm
3/ h, operating pressure is 10kPa, valve station owner combustion gas pipe arrangement and preheating rifle combustion gas pipe arrangement are DN80; Bypass igniting gas discharge is 20Nm
3/ h, bypass pipe arrangement are DN20; The combustion air peak flow is 2000Nm
3/ h, operating pressure is 6.0kPa, and valve station combustion air pipe arrangement is DN200, and preheating gun burner air pipe arrangement is DN150.Combustion-supporting oxygen peak flow is 500Nm
3/ h, an interface pressure is 1.0MPa, and the secondary operating pressure is 30kPa, and the oxygen pipe arrangement in valve station is that DN50, secondary oxygen pipe arrangement are DN80, and preheating rifle oxygen pipe arrangement is DN65; Preheating gun cooling water peak flow is 50N
3/ h, intake pressure are that 0.6MPa, temperature are 30 ℃, and top hole pressure is that 0.3MPa, temperature are 60 ℃, and valve station and preheating gun cooling water pipe arrangement are DN80; Purging the nitrogen peak flow is 30Nm
3/ h, pressure are 0.5MPa, and pipe arrangement is DN20; The instrument air average consumption is 5Nm
3/ h, pressure are 0.5MPa, and main pipe arrangement is DN25, and distribution piping is DN15; The instantaneous consumption peak of pressurized air is 40Nm
3/ h, pressure are 0.5MPa, and main pipe arrangement is DN25.
Gas discharge (F
NGAS), combustion air (F
AIR) and combustion-supporting oxygen (F
02) discharge relation:
Work as F
NGAS≤ 200Nm
3During/h, F
02=0, F
AIR=10 * F
NGAS
Work as F
NGAS＞200Nm
3During/h, F
AIR=2000Nm
3/ h, F
02=2 * (F
NGAS-200Nm
3/ h).
Second kind is to adopt the 300 ton RH molten steel refining vacuum channel standby preheating devices of coke-oven gas as combustion gas, and as shown in Figure 3, its main technique design data is as follows: vacuum tank pre-heating temperature elevation speed is 50 ℃/hour, and maximum heating temperature is 1200 ℃; 10 meters of the maximum lifting travels of preheating rifle; The coke-oven gas peak flow is 800Nm
3/ h, operating pressure is 10kPa, valve station owner combustion gas pipe arrangement and preheating rifle combustion gas pipe arrangement are DN100; Bypass igniting gas flow is 40Nm
3/ h, bypass pipe arrangement are DN25; The combustion air peak flow is 2000Nm
3/ h, operating pressure is 6.0kPa, and valve station combustion air pipe arrangement is DN200, and preheating gun burner air pipe arrangement is DN150.Combustion-supporting oxygen peak flow is 600Nm
3/ h, an interface pressure is 1.0MPa, and the secondary operating pressure is 30kPa, and the oxygen pipe arrangement in valve station is that DN50, secondary oxygen pipe arrangement are DN80, and preheating rifle oxygen pipe arrangement is DN65; Preheating gun cooling water peak flow is 50m
3/ h, intake pressure are 0.6MPa, and temperature is 30 ℃, and top hole pressure is that 0.3MPa, temperature are 60 ℃, and valve station and preheating gun cooling water pipe arrangement are DN80; Purging the nitrogen peak flow is 30Nm
3/ h, pressure are 0.5MPa, and pipe arrangement is DN20; The instrument air average consumption is 5Nm
3/ h, pressure are 0.5MPa, and main pipe arrangement is DN25, and distribution piping is DN15; The instantaneous consumption peak of pressurized air is 40Nm
3/ h, pressure are 0.5MPa, and main pipe arrangement is DN25.
Coke-oven gas flow (F
COG), combustion air (F
AIR) and combustion-supporting oxygen (F
02) discharge relation:
Work as F
COG≤ 300Nm
3During/h, F
02=0, F
AIR=6 * F
COG
Work as F
COG＞300Nm
3During/h, F
AIR=1800Nm
3/ h, F
02=F
COG-300Nm
3/ h.
Claims (4)
1, a kind of molten steel refining vacuum channel standby preheating device, it is characterized in that, form by preheating rifle (1), preheating rifle motion control mechanism (2), portfire (3), flame detecting device (4), vacuum tank (5), vacuum tank temperature-detecting device (6), monoblock type burning control valve station (7), intermediate connection tube road (8) and metallic hose assembly (9), PLC automatic control system (10);
Preheating rifle motion control mechanism (2) by up and-down motor EM, rotation is with electronic cylinder CM and promptly promote pneumatic motor AM and form;
Portfire (3) adopts common burning torch XE;
Flame detecting device (4) adopts highly sensitive aperture adjustable type flame detector XT;
Monoblock type burning control valve station by many groups valve, pipeline, flow transmitter, pressure unit, limit switch through connecting to form;
Monoblock type burning control valve station (7) is connected with the preheating rifle (1) of liftable and rotation by many metallic hose assemblies (9), the scene is provided with one and is used to control the lifting of preheating rifle, rotation, the execute-in-place case (11) that purges and light a fire, whole device is finished automatic detection and control by PLC automatic control system (10), wherein: preheating rifle (1) adopts electric up-down and rotation mode under standard state, the preheating rifle adopts up and-down motor EM and rotates with electronic cylinder CM under standard state, if the preheating rifle can not normally rise by the electricity consumption flowing mode, then adopt the urgent pneumatic motor AM of lifting and start pneumatic motor and carry out the preheating rifle and promptly promote, flame detects and adopts highly sensitive aperture regulative mode, gas ignition adopts the bypass sparking mode, the preheating gun cooling water adopts compound detection and chain control mode, primary heater unit adopts igniting, the safe combustion control mode of burning and purging loop structure, primary heater unit adopt vacuum tank to heat up or insulation burning master mode.
2, molten steel refining vacuum channel standby preheating device according to claim 1, it is characterized in that, monoblock type burning control valve station is connected with instrument air pipe (12), compressed air pipe (13), purging nitrogen tube (14), gas line (15), combustion air pipe (16), combustion-supporting oxygen hose (17), in addition, monoblock type burning control valve station also be used for hydronic cooling water inlet pipe (18) and CWR (19) is communicated with.
3, molten steel refining vacuum channel standby preheating device according to claim 1, it is characterized in that, in monoblock type burning control valve station (7), be provided with tensimeter PI, pressure switch PS and a series of pneumatic control valve successively on the pipeline of connection instrument air pipe (12); The pipeline that is communicated with compressed air pipe (13) is provided with tensimeter PI, pressure switch PS, and is connected with urgent lifting pneumatic motor; Be communicated with on the pipeline that purges nitrogen tube (14) and be provided with tensimeter PI, pressure switch PS, magnetic valve SV successively; Be provided with tensimeter PI, pressure switch PS, flow transmitter FT, flow control valve PCV, pneumatic cut-off valve FV, tensimeter PI successively on the pipeline of connection gas line (15), be provided with bypass in addition on the pipeline of connection gas line (15): comprise a pneumatic cut-off valve FV and two control valves; Be provided with tensimeter PI, pressure switch PS, flow transmitter FT, flow control valve PCV, pneumatic cut-off valve FV, tensimeter PI successively on the pipeline of connection combustion air pipe; Be provided with tensimeter PI, pressure switch PS, temperature transmitter TT, flow transmitter FT, pneumatic cut-off valve FV successively on the pipeline of connection cooling water inlet pipe (18); Be provided with tensimeter PI, temperature transmitter TT, flow transmitter FT successively on the pipeline of connection CWR (19); Described instrument air pipe, compressed air pipe, purging nitrogen tube, gas line, combustion air pipe, combustion-supporting oxygen hose, cooling water inlet pipe and CWR all pass through the intermediate connection tube road and are communicated with preheating rifle rifle body respectively, and correspondence is provided with pressure switch PS on the rifle body.
4, according to the using method of the described device of claim 1, it is characterized in that, concrete steps are as follows: the vacuum tank (5) that need heat up or be incubated processing moves to the standby preheating position, PLC automatic control system (10) automatically confirm that the energy medium state is normal, the burning fan operation is normal and the normal entry condition of gearing control device after, operator's operation site operation box (11) rotates to preheating rifle (1) by preheating rifle motion control mechanism (2) and handles the position, and drops to the interior certain position of vacuum tank (5); After this, operator's nitrogen purging program at the scene or before the central control chamber starting ignition, nitrogen purging is closed automatically after continuously purging 1～2 minute, 1～2 minute subsequently inherent same position starting ignition program, otherwise need purge again; Burning torch XE is the high pressure spot firelock, behind the starting ignition button, opens bypass igniting combustion gas automatically, and automatic setting combustion air igniting flow triggers the high pressure spot firelock simultaneously automatically and lights a fire; If flame detector detects flare up fire in 20 seconds, PLC automatic control system (10) enters the program that heats up or be incubated the burning master mode, otherwise starts the nitrogen purging program automatically; After lighting a fire successfully, operator select to heat up on operation screen according to vacuum tank (5) preheating requirement or insulation burning master mode, when in vacuum tank (5) intensification or insulation treating processes, taking place to satisfy chain safety condition or after the normal processing end, automatically close process of combustion, start the nitrogen purging program simultaneously automatically; Heating up or be incubated in the burning master mode, combustion gas and combustion air carry out automatic ratio control, when combustion gas reaches certain flow, start combustion-supporting oxygen automatically, carry out automatic ratio control simultaneously.
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| CNB2006100272016A CN100549188C (en) | 2006-06-01 | 2006-06-01 | Molten steel refining vacuum channel standby preheating device and method |
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| CNB2006100272016A CN100549188C (en) | 2006-06-01 | 2006-06-01 | Molten steel refining vacuum channel standby preheating device and method |
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| CN100549188C true CN100549188C (en) | 2009-10-14 |
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Cited By (1)
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| CN105063482A (en) * | 2015-08-27 | 2015-11-18 | 攀钢集团西昌钢钒有限公司 | X60 pipeline steel and manufacturing method thereof |
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| CN102676842B (en) * | 2011-03-10 | 2016-01-27 | 中国恩菲工程技术有限公司 | The Iganition control system of oxygen top-blown smelting furnace |
| KR101450651B1 (en) * | 2013-11-27 | 2014-10-15 | 우진 일렉트로나이트(주) | Continuous Temperature Sensor and RH apparatus including it |
| CN103789514B (en) * | 2014-01-15 | 2015-09-30 | 攀钢集团西昌钢钒有限公司 | A kind of system and method for RH furnace roof rifle coal oxygen burns the fuzzy control |
| CN104075332B (en) * | 2014-07-18 | 2016-09-07 | 武汉东晟捷能科技有限公司 | For improving the system and method for yellow phosphoric tail gas comprehensive utilization ratio |
| CN108060290A (en) * | 2018-01-31 | 2018-05-22 | 唐山国丰钢铁有限公司 | Gas toast device and its baking method below RH stoves vacuum chamber |
| CN109182660A (en) * | 2018-11-12 | 2019-01-11 | 中国重型机械研究院股份公司 | A kind of novel RH equipment for vacuum refining and control method |
| CN115595405B (en) * | 2022-09-27 | 2024-03-15 | 中国重型机械研究院股份公司 | Long-life jetting device and method for RH powder jetting technology |
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| CN1900327A (en) | 2007-01-24 |
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Owner name: BAOSTEER ENGINEERING TECHNOLOGY GROUP CO., LTD Free format text: FORMER OWNER: BAOGANG ENGINEERING TECHN CO., LTD., SHANGHAI Effective date: 20100723 |
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