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1. 发明专利

JP2004257679A Device and method for collecting dust of arc furnace 有权
标题翻译：用于收集电弧炉渣的装置和方法
公开(公告)号：JP2004257679A
公开(公告)日：2004-09-16
申请号：JP2003050429
申请日：2003-02-27
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： UCHIDA SHINJIRO , OOOKA TOSHIKAZU
IPC分类号： B01D46/00 , B01D46/44 , F27D17/00 , F27D19/00
摘要： PROBLEM TO BE SOLVED: To provide a device and a method for collecting dust of an arc furnace capable of effectively changing pressure fluctuation caused by change of exhaust gas generation stemming from change of operational conditions in the arc furnace for preventing dispersing the exhaust gas out of the arc.
SOLUTION: In the arc furnace dust collecting device having a furnace pressure setting device 16 for setting furnace pressure of the arc furnace 1 and a detecting device 13 for detecting the furnace pressure of the arc furnace, a moving duct 4 is arranged downstream side of a furnace cover side duct. The device comprises a moving duct control device 17 for controlling speed of the moving duct, a comparison operator for comparing/operating pressure difference between a target value of the furnace pressure set by the furnace pressure setting device and a measured value of the furnace pressure detecting device, and a moving duct control device for controlling a space s between the furnace cover side duct and the moving duct side by the comparison operator. In the method for collecting dust of the arc furnace, the furnace pressure setting device 16 sets the furnace target pressure of the arc furnace 1 and the furnace pressure detecting device 13 provided in the arc furnace detects the furnace pressure. In this method, the moving duct 4 is arranged downstream side of the furnace cover side duct 3, the pressure difference between the furnace target pressure set by the furnace pressure setting device 16 and the measured value of the furnace pressure detecting device 13 is compared/operated, and the space s between the furnace cover side duct 3 and the moving duct side 4 is controlled based on the operation result.
COPYRIGHT: (C)2004,JPO&NCIPI
摘要翻译：要解决的问题：提供一种用于收集电弧炉灰尘的装置和方法，该电弧炉能够有效地改变由于电弧炉中的操作条件的变化引起的排气变化的变化引起的压力波动，以防止排气气体出弧。解决方案：在具有用于设定电弧炉1的炉压的炉压设定装置16的电弧炉除尘装置和检测电弧炉的炉压的检测装置13中，配置有下游侧的移动管道4 一侧的炉盖侧管道。该装置包括用于控制运动管道的速度的移动管道控制装置17，用于比较/操作由炉压设定装置设定的炉压的目标值与炉压检测的测量值之间的压力差的比较运算器装置和用于通过比较操作器控制炉盖侧管道和移动管道侧之间的空间的移动管道控制装置。在电弧炉的粉尘收集方法中，炉压设定装置16设定电弧炉1的炉靶压力，设置在电弧炉中的炉压检测装置13检测炉压。在这种方法中，移动导管4设置在炉盖侧管道3的下游侧，将由炉压设定装置16设定的炉对象压力与炉压检测装置13的测定值之间的压差进行比较/ 并且基于操作结果来控制炉盖侧管道3和移动管道侧4之间的空间。版权所有（C）2004，JPO＆NCIPI

2. 发明专利

JPH06300450A ELECTRODE LENGTH MONITORING METHOD FOR DC ARC FURNACE 失效
公开(公告)号：JPH06300450A
公开(公告)日：1994-10-28
申请号：JP11237193
申请日：1993-04-16
申请人： NIPPON STEEL CORP , NITTETSU PLANT DESIGNING CORP
发明人： OOOKA TOSHIKAZU , GOTO KIMIYOSHI
IPC分类号： F27B3/08 , F27B3/28 , F27D11/08 , F27D21/00
摘要： PURPOSE:To accurately monitor electrode length and melted steel level height by lowering a support arm from a reference height at the upper electrode support arm height using an electrode length measurement reference pedestal installed outside a furnace and an electrode seat detector mounted on a wire end of an electrode elevation apparatus. CONSTITUTION:An output signal is received from an electrode height location detector 11 and electrode elevation location heights B, D, and F are evaluated. Then, it is detected that an upper electrode makes contact with a pedestal B when an electrode measurement pedestal 13 is used, and there is evaluated a movement amount Lb obtained by the detector 11 when a height location C of the pedestal 13 is detected. Then, a reference electrode length Lc is evaluated on the basis of a distance between the height location C of the pedestal 13 and a reference height location A of an upper electrode support arm 7, and it is detected that an upper electrode 5 makes contact with a melted steel surface 15 upon arcing control and hence a movement amount Ly is evaluated on the basis of a melted steel surface height level E. The height location E is estimated on the basis of the heights C and A, and a fraction of a change in a charging amount is converted into a height fraction to estimate a melted steel surface height Lx.

3. 发明专利

JPH0613178A VOLTAGE CONTROL METHOD FOR DIRECT CURRENT ARC FURNACE 失效
公开(公告)号：JPH0613178A
公开(公告)日：1994-01-21
申请号：JP17096892
申请日：1992-06-29
申请人： NIPPON STEEL CORP
发明人： OOOKA TOSHIKAZU
IPC分类号： F27D21/00 , H05B7/148
摘要： PURPOSE:To improve a power factor in an electric power supply device while maintaining the progress of melting of metal to be melted by means of an arc. CONSTITUTION:A maximum variation of arc voltage to preset voltage is detected from a signal of a voltage detector 12 by means of a voltage variation operation part 16. In a period when an electric current of not less than 50% of a value preset by means of an electric current setting unit 14 is detected to prevent erroneous detection by means of a signal of an electric current detector 13, signal data of the voltage detector 12 are gathered. The data are gathered for a fixed time (several seconds-several minutes) with every constant period, and preset voltage is subtracted from a maximum data value during this time, and the maximum variation of the arc voltage to the preset voltage is detected. Maximum usable voltages of respective taps and the sum of the maximum variation of the detected arc voltage and a preset voltage value are compared with each other, and a secondary voltage tap of a transformer is selected according to the maximum variation of the arc voltage.

4. 发明专利

JPH11237189A SLEEVE BRICK STRUCTURE FOR BOTTOM ELECTRODE OF DC ELECTRIC FURNACE 失效
公开(公告)号：JPH11237189A
公开(公告)日：1999-08-31
申请号：JP5602898
申请日：1998-02-20
申请人： NIPPON STEEL CORP
发明人： NAKAYAMA TOSHITAKA , OOOKA TOSHIKAZU
IPC分类号： F27B3/08 , F27D1/04 , F27D11/08
摘要： PROBLEM TO BE SOLVED: To prolong the lifetime of a bottom electrode of furnace by stabilizing the operation thereof. SOLUTION: An anode electrode section 14 comprising a rod-like electrode 18, irregular refractories 21 surrounding the electrode 18, and sleeve bricks 23 fitted vertically between the electrode 18 and the refractories 21 through a horizontal joint 22 at least across two stages is buried in the bottom 10 of a DC electric furnace to obtain a sleeve brick structure for the bottom electrode of DC electric furnace. Reinforcing sleeve bricks 24 are placed between the sleeve bricks 23 and the refractories 21 and the outer circumferential surface of the sleeve brick 23 is jointed through a bonding material to the inner circumferential surface of the sleeve brick 24.

5. 发明专利

JP2001133167A VOLTAGE CONTROL DEVICE OF DC ARC FURNACE 失效
公开(公告)号：JP2001133167A
公开(公告)日：2001-05-18
申请号：JP31122699
申请日：1999-11-01
申请人： NIPPON STEEL CORP
发明人： OOOKA TOSHIKAZU , TAMARU KOJI
IPC分类号： G05F1/20 , C21C5/52 , F27B3/20 , F27D11/08 , H05B7/148
摘要： PROBLEM TO BE SOLVED: To improve a power factor while keeping productivity by supplying an electrical power of wide range ranging from a high voltage low current to a low voltage high current for the progress of melting in a transformer having a non-voltage tap switch device in which a tap can not be selected while supply of electrical power is being maintained. SOLUTION: This voltage control device is constituted of a control margin factor calculating unit 19 for calculating a margin factor for every tap voltage; a power factor calculating unit 20 for calculating an estimated power factor; a step time calculating unit 21 for calculating a step time where each of the set values is set; a tap selecting part 22 for selecting a tap voltage where a maximum estimated power factor can be attained; and a correction calculating unit 23 for correcting the set value based on an interruption time of electrical power supply.

6. 发明专利

JPH10281647A SLEEVE BRICK FOR FURNACE BOTTOM ELECTRODE OF DIRECT CURRENT ELECTRIC FURNACE 失效
公开(公告)号：JPH10281647A
公开(公告)日：1998-10-23
申请号：JP10244697
申请日：1997-04-07
申请人： NIPPON STEEL CORP , NITTETSU PLANT DESIGNING CORP
发明人： KAWAJIRI SATORU , OOOKA TOSHIKAZU , NAKAYAMA TOSHITAKA
IPC分类号： H05B7/06 , F27B3/08 , F27B3/14 , F27D1/04
摘要： PROBLEM TO BE SOLVED: To provide a furnace bottom electrode of a direct current electric furnace having a long lifetime by preventing floating and dissipation of a sleeve brick caused by a selective erosion of a joint portion of the sleeve brick and an infiltration of molten electrode into the joint portion. SOLUTION: In a sleeve brick 11 provided around a bar-like electrode 5 made of metal, sleeve brick joints 12 are formed in a step-like manner in a direction from the bar-like electrode 5 to monolithic refractories 10 so that a selective erosion of the sleeve brick joints 12 and a infiltration of molten electrode into the sleeve brick joints 12 can be reduced. Accordingly, an increase of floating force which the sleeve brick 11 receives from molten can be restricted and and adhering strength of the sleeve brick 11 can be maintained so that floating and dissipation of the sleeve brick 11 can be prevented and the lifetime of the sleeve brick 11 can be prolonged thus obtaining a furnace bottom electrode having a long lifetime.

7. 发明专利

JPH0791839A DC ARC FURNACE 失效
公开(公告)号：JPH0791839A
公开(公告)日：1995-04-07
申请号：JP25519093
申请日：1993-09-20
申请人： NIPPON STEEL CORP
发明人： TAKAHASHI MAKOTO , OOOKA TOSHIKAZU
IPC分类号： H05B7/152 , F27B3/08 , F27D11/08
摘要： PURPOSE:To provide a DC arc furnace in which a structure of an electrode elevator is simplified, large power can be supplied and which has a low cost and excellent maintainability by holding two to three graphite electrodes at one vertically movable arm for an upper electrode. CONSTITUTION:Two to three graphite electrodes are held at one vertically movable arm for an upper electrode, and voltages between the upper electrode and furnace bottom electrodes are measured by voltage detectors 16a, 16b. An average value of measured voltages calculated by a calculator 18 is compared with a value set by a voltage setter by a comparator 19, and its deviation is output to a speed deciding circuit 20. The circuit 20 decides a speed command (rotating direction and number of revolutions) of the upper electrode according to the deviation, and a speed controller 21 controls a height of the upper electrode based on a speed command through a voltage vertical movement driver 11.

8. 发明专利

JP2003240439A COOLING STRUCTURE FOR BOTTOM ELECTRODE AND COOLING METHOD FOR BOTTOM ELECTRODE IN DC ELECTRIC FURNACE 审中-公开
公开(公告)号：JP2003240439A
公开(公告)日：2003-08-27
申请号：JP2002039658
申请日：2002-02-18
申请人： NIPPON STEEL CORP , NITTETSU PLANT DESIGNING CORP
发明人： UCHIDA SHINJIRO , OOOKA TOSHIKAZU , KANAMARU TOSHINORI
IPC分类号： F27B3/24 , F27B3/08
摘要： PROBLEM TO BE SOLVED: To provide a cooling structure for a bottom electrode without infiltrating cooling water into refractories around the bottom electrode, even when deformation and cracks are generated in a side surface cooling member. SOLUTION: In this structure for cooling the bottom electrode in a DC electric furnace, a cooling member 5 for cooling the bottom electrode 1 is disposed on an outer periphery of the bottom electrode 1, a space member 7 formed with a space part 70 is disposed on an outer peripheral side of the cooling member 5, and cooling gas is passed through the space part 70. COPYRIGHT: (C)2003,JPO

9. 发明专利

JPH10281646A METHOD FOR OPERATING DUPLEX ARC FURNACE EQUIPMENT 失效
公开(公告)号：JPH10281646A
公开(公告)日：1998-10-23
申请号：JP9116797
申请日：1997-04-09
申请人： NIPPON STEEL CORP
发明人： OOOKA TOSHIKAZU
IPC分类号： F23D14/32 , F27B3/08 , F27D17/00
摘要： PROBLEM TO BE SOLVED: To minimize the electric energy by heightening the temperature of discharged gas introduced into a preheating furnace by combusting unburned CO gas inside a melting furnace and heightening the temperature of the gas inside the preheating furnace combusting the unburned CO gas inside the preheating furnace. SOLUTION: Gas analyzers 14A and 14C for measuring the CO content of the discharged gas are arranged to a duct 10 connecting between an A furnace and a B furnace that are arc two units of the arc furnaces and gas analyzers 14B and 14D for measuring the CO content of the discharged gas are arranged to a duct 15A and 15B on the outputting side of a preheating furnace. Scrap 9 is preheated by inputting scrap 9 and carbon blocks 13 as coke into the B furnace where a part of molten steel 8 is remaining and transferring high temperature discharged gas generated by the A furnace to the B furnace through the duct 10. The unburned CO gas generated by the A furnace in melting is measured by the gas analyzer 14A, the blown in quantity of oxygen to the A furnace is controlled based on the measured value and the temperature of the discharged gas introduced into the preheating furnace from the melting furnace is heightened.

10. 发明专利

JPH10237531A METHOD AND INSTRUMENT FOR DETECTING FURNACE HEARTH LEVEL OF DC ARC FURNACE 失效
公开(公告)号：JPH10237531A
公开(公告)日：1998-09-08
申请号：JP5427397
申请日：1997-02-24
申请人： NIPPON STEEL CORP
发明人： OOOKA TOSHIKAZU , TAMARU KOJI
IPC分类号： G01F23/24 , C21C5/52 , F27B3/08 , F27D1/00 , F27D21/00
摘要： PROBLEM TO BE SOLVED: To remarkably simplify a controller without needing a special detector, etc., and to accurately observe the height of a furnace hearth surface at a low cost by using an attached device to an arc furnace needed to the operation of the arc furnace. SOLUTION: In this method for detecting the furnace hearth level of the DC arc furnace for melting and heating the metal 5 to be melted such as scrap by forming arc 10 between at least one piece of elevating/lowering upper electrode 7 and a furnace bottom electrode 6, the upper electrode length (L0) under an electrode holder 9 is calculated from the electrode holder height 9 measured in the outside of the arc furnace 1 and the reference value of the upper electrode 7 height, and the furnace hearth 2 level (Hr) is calculated from the upper electrode length (L0), the remained molten steel height (L1) calculated from the remained molten steel quantity in the furnace and the electrode holder height (H0) measured at the time of bringing the tip part of the upper electrode into contact with the remained molten steel. The difference between the furnace hearth level (Hr) and the preset reference furnace hearth level (Hm) is calculated to decide repairing time of the furnace hearth.

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