JPH1046222A - Device for generating impulse wave in measuring instrument in furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device excellent in durability and safety, at the time of providing an impulse wave generating device in a measuring instrument in a furnace, for temp. in the furnace. SOLUTION: This device has a constitution composed of a fixed unit 1 fixed to a furnace wall and a movable unit 2 connected with the fixed unit 1 so as to be freely advanced/retreated, and arranging a wave directing angle 4 in the fixed unit and on the other hand, a valve chamber 14 and a closed chamber 16 in the movable unit. When the movable unit 2 retreats with reaction of explosive impulse wave, a damper for supporting and buffering the movable unit and springs 24, 25 for returning back the movable unit to the original position are parallel arranged and further, a valve 13 for opening/closing a valve chamber 14 is constituted with the safety valve opening the valve chamber by breaking at the time of accidentally exploding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shock wave generator in an in-furnace measuring apparatus for measuring a furnace temperature and / or a furnace filling state using a shock wave.

[0002]

2. Description of the Related Art Conventionally, in a blast furnace, an incinerator, and other furnaces, a technique of inserting a sonde into a furnace to measure the temperature inside the furnace is known. Dangerous in measurement work.

Therefore, as proposed in Japanese Patent Application Laid-Open No. Hei 3-243708, the temperature inside the furnace and / or the state of filling or the charged state of the charged substance are indirectly measured by a shock wave without the need for inserting a sonde or the like. Technology is advantageous and should be leveraged.

[0004] The in-furnace measurement technique using this shock wave is based on a technique in which at least one, preferably a plurality of sound wave generating means for emitting a shock wave toward a furnace core, and a plurality of receiving sensors comprising pressure-sensitive elements are connected to a furnace circle. It is implemented by installing at intervals in the circumferential direction.

That is, when a shock wave is emitted from one sound wave generating means, the receiving sensor nearest to the sound wave generating means receives the shock wave simultaneously with the emission, but the other receiving sensors receive the shock wave after a delay time. The propagation speed of the shock wave in the furnace can be known from such a propagation time. Therefore, the sound speed in the gas is determined by the specific heat ratio, the gas constant, and the gas temperature, so that the gas temperature can be obtained from the propagation speed of the shock wave. When a plurality of sound wave generating means are provided as described above, the operation of emitting and receiving a shock wave from the next sound wave generating means after the maximum delay time from the emission of the shock wave to the reception is repeated, so that the temperature in the furnace inner circumferential direction is increased. The distribution can be measured.

On the other hand, if the decay rate of the shock wave is detected by the same shock wave sound wave generating means and receiving sensor, the filling state in the furnace can be measured.

[0007]

The in-furnace measurement technique using a shock wave described as a conventional example is extremely excellent in theory, but it is necessary to consider the following points in actual implementation.

In order to propagate a shock wave in a furnace and to detect a propagation speed and / or an attenuation rate, it is necessary to use a strong shock wave which does not easily attenuate. Must launch a strong compression wave that propagates underneath. For this reason, for example, it is desirable to generate a shock wave by instantaneous explosive combustion of gas fuel or explosive, or even if a shock wave is generated by means other than explosive combustion, a strong explosive shock wave with pressure It is necessary to configure the generating means.

However, when such an explosive shock wave generating means is configured as a device, safety measures must be taken in preparation for an emergency.

[0010] Further, since the temperature condition and the filling condition in the furnace affect the combustion results in real time, a device which can be frequently measured meets the needs, but an explosive shock wave is emitted. Every time it is performed, an extremely large impact reaction force is applied to the device, and therefore, a structure that can withstand this must be provided.

[0011]

SUMMARY OF THE INVENTION The present invention provides a shock wave generator in an in-furnace measuring apparatus which solves the above-mentioned problems.
A shock wave generator in a furnace measuring apparatus that performs at least one of a measurement of a furnace temperature based on a propagation velocity of a shock wave propagating in a furnace and a measurement of a furnace filling state based on a damping rate of the shock wave. A fixed unit fixed to the furnace wall, and a movable unit connected to the fixed unit so as to be able to move forward and backward. The fixed unit includes a waveguide nozzle facing the furnace and an axial direction of the waveguide nozzle. The movable unit includes a movable support unit movably supported by the advance / retreat guide unit, a valve chamber having an open / close valve, and a slide extending forward from the valve chamber to the waveguide nozzle. A communication pipe movably connected to the sealing pipe, a sealing chamber having shock wave generating means extending rearward from the valve chamber, and a valve driving means for opening and closing the valve chamber; A damper for supporting and damping the movable support means when the movable support means is retracted along with the movable unit together with the movable unit by a reaction force which emits the generated shock wave from the waveguide nozzle, and the movable support means. A spring for returning to the original position is provided between the reciprocating guide means and the movable support means.

Further, the present invention is configured as a second means, which comprises measuring a furnace temperature based on a propagation speed of a shock wave propagating in the furnace and measuring a filling state in the furnace based on a damping rate of the shock wave. Among them, a shock wave generator in an in-furnace measurement device that performs at least one measurement, comprising a fixed unit fixed to the furnace wall, and a movable unit connected to the fixed unit to be able to advance and retreat, the fixed unit is ,
A waveguide nozzle facing the furnace, comprising advance / retreat guide means extending in the axial direction of the waveguide nozzle, wherein the movable unit is movable support means movably supported by the advance / retreat guide means,
A valve chamber having an on-off valve, a communication pipe extending forward from the valve chamber and slidably communicating with the waveguide nozzle, and a sealed chamber having shock wave generating means extending rearward from the valve chamber; A valve driving means for opening and closing the valve chamber, wherein when the shock wave is generated by the shock wave generating means while the valve chamber is closed, the valve is destroyed by the impact and opens the valve chamber toward the communication chamber. It consists in configuring a valve.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings.

In the present invention, the shock wave generator is used by being incorporated into the above-described in-furnace measuring apparatus, and is used together with a receiving sensor including a pressure-sensitive element or the like. At this time, at least one shock wave generator is attached to the furnace wall, but a plurality of shock wave generators may be attached at intervals. Further, the in-furnace measuring device including such a shock wave generating device and the receiving sensor may measure only the temperature in the furnace by detecting a propagation speed of the shock wave, or may detect a damping rate of the shock wave. May be used to measure only the state of filling in the furnace, and furthermore, by measuring both the propagation velocity and the attenuation rate, the temperature and the state of filling in the furnace may be measured together.

As shown in FIG. 1, the shock wave generator comprises a fixed unit 1 fixed to a furnace wall and a movable unit 2 connected to the fixed unit 1 so as to be able to move forward and backward.

The fixed unit 1 has a waveguide nozzle 4 attached and fixed to the furnace wall by a clamp type attaching means 3, and the waveguide nozzle 4 faces the inside of the furnace through an opening in the furnace wall. I have. The waveguide nozzle 4 has a mounting flange 5 at the front end fixed to the mounting means 3, and an advancing / retreating guide means 6 extending in the axial direction connected to the rear end of the waveguide nozzle 4. In the vicinity of the tip of the waveguide nozzle 4, there is provided a receiving unit 7 for detecting the emission time of the shock wave. Therefore, after the receiving unit 7 detects the emission of the shock wave, the arrival of the shock wave is detected by the receiving sensor provided separately from the shock wave generating device, and the propagation speed of the shock wave in the furnace is detected based on the delay time. .

The advance / retreat guide means 6 includes a first fixing flange 8 fixed to the rear end of the waveguide nozzle 4, and a second fixing flange 8 spaced behind the first fixing flange 8. It is constructed by integrally assembling a flange 9 and a plurality of guide rods 10 connecting both flanges 8 and 9. In the case of the illustrated example, as shown in FIG. 2, four guide rods 10 are provided. In each of the guide rods 10, the screw shaft portions 10a at both shaft ends are inserted through the respective flanges 8 and 9, and the nut 10b is fixed. doing. The first fixing flange 8 is reinforced by ribs 8a and surrounds and fixes the outer peripheral portion of the waveguide nozzle 4, while the second fixing flange 9 has a play opening 9a in the center. A terminal box 11 for driving an electromagnetic valve, which will be described later, is mounted below the flange 9.

The movable unit 2 has a movable support means 12 supported by the advance / retreat guide means 6 of the fixed unit 1 so as to be able to move forward and backward, a valve chamber 14 having an opening / closing valve 13, and extends forward from the valve chamber 14. A communication pipe 15 slidably communicated with the waveguide nozzle 4, a sealing chamber 16 provided with explosion means (shock wave generation means) extending rearward from the valve chamber 14, and a valve drive for opening and closing the valve chamber 14 Means 17 are provided.

The movable support means 12 comprises a pair of movable flanges 18, 18 slidably mounted on the guide rod 10 of the advance / retreat guide means 6, and both flanges 18, 18 are provided.
A rigid body structure is formed by integrally incorporating the valve housing member 19 therebetween. The valve housing member 1
A valve 13 is inserted from below into a valve chamber 14 formed inside the valve 9, and the valve 13 is driven by a driving means 21 such as an air cylinder provided on a frame 20 connected to the movable supporting means 12. To drive forward and backward. The frame 20 is provided with a pair of limit switches 22a and 22b. The limit switches 22a and 22b detect a closed position and an open position of the valve 13, and actuate a driving unit 21 via the terminal box 11 such as an electromagnetic valve. Switching means 2
3 is controlled.

Between the movable flanges 18 and 18 constituting the movable support means 12 and the first and second fixed flanges 8 and 9 constituting the advance / retreat guide means 6, springs 24 and 25 comprising compression coil springs are provided. It is interposed and each is extrapolated to the guide rod 10. That is, the first spring 24 is interposed between the first fixed flange 8 and the movable flange 18 opposed thereto, and the second spring is interposed between the second fixed flange 9 and the movable flange 18 opposed thereto. The movable support means 12 is held at a position where both springs 24 and 25 are balanced.

Further, as shown in FIG. 2, dampers 26, 26 are provided on both sides of the second fixing flange 9,
The damper 26 is inserted through the flange 9 and is fixed by a nut 27. As shown in FIGS. 5 and 6, the damper 26 constitutes an oil damper in which an oil flow path 30 provided with an accumulator 29 between the outer cylinder 28 and the inner cylinder 31 is slidable on the inner cylinder 31. The piston rod 33 of the inserted piston 32 is
And an elastic pad 34 made of rubber, flexible synthetic resin, or the like is provided at the tip of the piston rod 33. The oil passage 30 and the inner cylinder 31
Is filled with oil, and the piston 32 is urged in a direction to make the piston rod 33 protrude by a return spring 35 provided in the inner cylinder 31. As will be described later, the movable flange 18 retreats and the elastic pad 3
4, the piston 32 moves toward the rear of the cylinder against the return spring 35. At this time, the piston 3
The oil of the inner cylinder 31 pressed by 2 penetrates into the oil passage 30 through the orifice 36a, and the oil in the oil passage 30 penetrates into the inner cylinder 31 on the piston rod 33 side through the orifice 36b.

The sealing chamber 16 constitutes a sealing pipe 37 extending long from the valve chamber 14 toward the rear.
An ignition device 38 composed of an ignition plug is provided at the tail end of the ignition device. In the vicinity of the ignition device 38, a C
A combustion gas supply pipe 39 for supplying a combustion gas composed of a mixed gas of ₃ H ₈ and O ₂ and a purge gas supply pipe 40 for supplying a purge gas composed of N ₂ gas are connected. An exhaust pipe 41 is connected to a position near the valve chamber 14 of the sealed pipe 37, and the exhaust pipe 41 is provided with a valve 42 such as an electromagnetic valve.

As shown in FIG. 3, the valve 13 has a circular tongue 43a formed on the surface of a tongue piece 43 which is inserted into the valve chamber 14 so as to be able to advance and retreat, and is concentric with the recess 44a. A circular opening 44b is opened, and the safety valve plate 45 is fitted in the concave portion 44a to open the opening 44b.
The presser ring 46 is overlapped with the safety valve plate 45, and the presser ring 46, the safety valve plate 45, and the tongue piece 43 are closed.
Are fixed in a sandwich shape by attaching / detaching means 47 such as countersunk screws. The safety valve plate 45 is made of a thin plate, such as a stainless steel plate, which is excellent in chemical resistance, etc., but can be easily broken mechanically, and preferably has a cut groove 48 in a radial direction as shown in FIG. doing. The incision 48 does not penetrate the safety valve plate 45, but easily breaks and opens the opening 44b as shown by a chain line in FIG. When the safety valve plate 45 is broken, a new safety valve plate 4 is
5 is interchangeable.

The shock wave generator having the above configuration is controlled by an automatic control device such as a microcomputer, and generates a shock wave in accordance with an instruction of an operator. The operator need only input the required number of explosions and instruct the start of the explosion.

First, after the valve 13 is closed, the sealing chamber 16 is closed by closing the valve 41 of the exhaust pipe 41 while supplying combustion gas from the combustion gas supply pipe 39 to the sealing chamber 16.
The combustion chamber is filled with the combustion gas.

Next, as soon as the valve 13 is opened, when ignited by the ignition device 38, explosive combustion occurs in the sealed chamber 16, and a shock wave is emitted into the furnace through the valve chamber 14, the connecting pipe 15, and the waveguide nozzle 4. You.

A large reaction force is applied to the connecting pipe 15, the valve chamber 14, and the sealing chamber 16 by the emission of the shock wave, and the movable unit 2 retreats with respect to the fixed unit 1 by receiving the reaction force. 1 and 5 show a state before the movable unit 2 retreats, and FIGS. 4 and 6 show a state after the movable unit 2 retreats.

The reaction force applied to the movable unit 2 is strong with an impact, but the movable support means 12 retreats along the advance / retreat guide means 6 while damping the impact by the damper 26. Therefore, no unfavorable impact stress is generated in each part of the movable unit 2.

Thereafter, the movable unit 2 is pushed back along the advance / retreat guide means 6 by the second spring 25,
The first spring 24 is returned to the original position that maintains a state of equilibrium with the first spring 24. Subsequently, the piston 32 of the damper 26 is gradually returned by the return spring 35, and the elastic pad 34 contacts the movable flange 18.

When the explosion is completed, the valve 42 of the exhaust pipe 41 is opened with the valve 13 opened, and the purge gas supply pipe 4 is opened.
The purge gas flows into the sealed chamber 16 from 0 and is discharged from the exhaust pipe 41 and the waveguide nozzle 4 to clean the inside.

When the cleaning is completed, the explosion of the shock wave is repeated according to the specified number of times by the same operation as described above. At this time, a thermocouple and other temperature measuring elements (not shown) are provided in the sealed tube 37 to detect abnormal heating of the sealed tube 39 for safety, and to make the sealed chamber 16 optimal for the next explosion. Detects whether the temperature is appropriate or not, and contributes to the intended purpose of generating shock waves.

By the way, the automatic control device has a function of checking whether the valve 13 is normally opened at the time of the explosion. If it is mistakenly recognized that the ignition operation is performed, there is a risk that the sealed tube 37 is blown up.
Such an accident has a serious danger of personal injury due to the shock wave generator being provided outside the furnace, in addition to the economic loss of severely destroying the device.

Therefore, according to the above configuration, if a blast is performed in the sealed chamber 16 while the valve 13 is closed, the safety valve plate 45 is caused by the explosion pressure as shown by a chain line in FIG. Since it is destroyed, the opening 45 of the valve 13 is opened, and the explosive force is released toward the furnace, the sealed tube 32 is not ruptured.

In the above embodiment, the sealed chamber 1 of the sealed tube 37 is
Although the configuration for causing explosive combustion of gas in 6 has been described, the shock wave generating means of the present invention can be configured by various means other than explosive combustion as long as it can generate a desired shock wave. For example, by closing the open / close valve 13, gas is compressed and filled into the hermetically sealed chamber 16 via a compressor or the like, and in this state, the open / close valve 13 of the valve chamber 14 is instantaneously opened and directed toward the waveguide nozzle 4. The shock wave generating means may be constituted by performing explosive gas release accompanied by a shock wave. In this case, a necessary shock wave can be generated. According to such a shock wave generating means that does not involve combustion, since the apparatus is not heated by explosive combustion as in the above-described embodiment, intermittent continuous emission of shock waves can be repeatedly performed at short intervals. Become.

[0035]

According to the present invention, the movable unit 2 is moved forward and backward with respect to the fixed unit 1 fixed to the furnace wall.
And moveable and retractable via movable support means 12,
Since the waveguide unit 4 is provided for the fixed unit 1 and the valve chamber 14 having the open / close valve 13 and the sealed chamber 16 are provided for the movable unit 2, a strong shock wave is generated. In spite of this, it is possible to provide a device that absorbs the impact reaction force to the device and can sufficiently withstand repeated firing of a shock wave.

In particular, according to the present invention, the movable unit 2 is moved along the advance / retreat guide means 6 via the movable support means 12 by the reaction force of emitting the explosive shock wave generated in the sealed chamber 16 from the waveguide nozzle 4. The damper 26 supports and cushions the movable support means 12 when retracted, and the spring 25 returns the movable support means 12 to its original position.
Are arranged in parallel between the reciprocating guide means 6 and the movable support means 12, and thus the functions of the movable unit 2 to alleviate the absorption of the impact reaction force and the return movement after the disappearance of the impact are shared. Therefore, there is an advantage that a strong impact can be suitably dealt with.

Further, according to the present invention, when the valve chamber 14 is closed by the valve 13 for sealing the sealing chamber 16, the valve 13 is broken by a predetermined pressure and the valve chamber 14 is connected to the connecting pipe 15. Since the safety valve is configured to open toward the vehicle, there is an effect that safety can be ensured even in the event of an accidental accident.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention.

FIG. 2 is a side view showing a second fixing flange in one embodiment of the present invention.

3A and 3B show a valve according to an embodiment of the present invention, wherein FIG. 3A is a side view of the valve, FIG.
(C) is a longitudinal sectional view of the disassembled state.

FIG. 4 is a cross-sectional view showing a main part when a shock wave is emitted according to the embodiment of the present invention.

FIGS. 5A and 5B show a state before a shock wave is emitted in one embodiment of the present invention, wherein FIG. 5A is a cutaway sectional view showing an advance / retreat guide mechanism, FIG. 5B is a cutaway sectional view showing a damper, and FIG. FIG.

6A and 6B show a state when a shock wave is emitted in one embodiment of the present invention, wherein FIG. 6A is a cutaway sectional view showing an advance / retreat guide mechanism, FIG. 6B is a cutaway sectional view showing a damper, and FIG. FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 fixed unit 2 movable unit 4 waveguide nozzle 6 advance / retreat guide means 8 first fixed flange 9 second fixed flange 10 guide rod 12 movable support means 13 valve 14 valve chamber 15 communication pipe (communication chamber) 16 sealed chamber 18 movable Flange 19 Valve housing member 21 Valve driving means 24 First spring 25 Second spring 26 Damper 37 Seal tube 38 Ignition device 39 Combustion gas supply tube 40 Purge gas supply tube 41 Exhaust tube 44a Recess 44b Opening 45 Safety valve plate 46 Holding ring

Continued on the front page (72) Inventor Nakakita Ji 1-7-10 Nishihonmachi, Nishi-ku, Osaka-shi Kawaso Electric Industries Co., Ltd. (72) Yoshihisa Kawamoto 1-7-110 Nishihonmachi, Nishi-ku, Osaka-shi Kawaso (72) Inventor Eiji Fujii 1-7-10 Nishihonmachi, Nishi-ku, Osaka-shi Kawaso Electric Industry Co., Ltd.

Claims (2)

[Claims] An in-furnace measuring apparatus for performing at least one of a measurement of a furnace temperature based on a propagation speed of a shock wave propagating in a furnace and a measurement of a furnace filling state based on a damping rate of the shock wave. A shock wave generator, comprising: a fixed unit fixed to a furnace wall; and a movable unit connected to the fixed unit so as to be able to move forward and backward, wherein the fixed unit includes a waveguide nozzle facing a furnace, and a waveguide. The movable unit includes movable support means supported by the advance / retreat guide means so as to be able to move forward and backward, a valve chamber provided with an open / close valve, and a forward extending from the valve chamber. A communication pipe slidably communicated with the waveguide nozzle, a sealed chamber having shock wave generating means extending rearward from the valve chamber, and a valve driving means for opening and closing the valve chamber; A damper for supporting and cushioning the movable support means when the movable support means is retracted along the advance / retreat guide means together with the movable unit by a reaction force which radiates the shock wave generated by the shock wave generation means from the waveguide nozzle; and A shock wave generator in an in-furnace measuring device, wherein a spring for returning the support means to its original position is provided between the advance / retreat guide means and the movable support means. 2. An in-furnace measuring apparatus for performing at least one of a measurement of a furnace temperature based on a propagation speed of a shock wave propagating in a furnace and a measurement of a furnace filling state based on a damping rate of the shock wave. A shock wave generator, comprising: a fixed unit fixed to a furnace wall; and a movable unit connected to the fixed unit so as to be able to move forward and backward, wherein the fixed unit includes a waveguide nozzle facing a furnace, and a waveguide. The movable unit includes movable support means supported by the advance / retreat guide means so as to be able to move forward and backward, a valve chamber provided with an open / close valve, and a forward extending from the valve chamber. A communication pipe slidably communicated with the waveguide nozzle, a sealed chamber having shock wave generating means extending rearward from the valve chamber, and a valve driving means for opening and closing the valve chamber; The valve is characterized in that, when a shock wave is generated by the shock wave generating means while the valve chamber is closed, the valve is configured to constitute a safety valve that is broken by the impact and opens the valve chamber toward the communication chamber. Shock wave generator in measuring equipment.