KR100406377B1 - Device for removing the tar of burner for recompensing deoxidation gas - Google Patents

Abstract

The present invention relates to a device that can easily and automatically remove the tar condensed in the burner installed for the reduction gas temperature compensation between the reactor in the flow reduction reactor, more specifically in the molten iron manufacturing process using ordinary coal and iron ore Reduced gas temperature compensation burner which can increase burner operation rate and improve maintainability of burner facility by automatically removing tar condensed in temperature compensation burner by tar and fuel gas containing tar The tar removal apparatus of the present invention.

The present invention, the resistance detector (9) for measuring the resistance value by detecting the resistance generated between the anode end of the ignition electrode (8); and generates an operation signal based on the resistance value of the resistance sensor (9) A solenoid valve extending into the main burner 5 such that an end portion and an outlet end of the pilot burner 6 correspond to each other, and are opened and closed by an operation signal of the signal generator 10. It is provided with a (18) to provide a tar removal apparatus of the burner for reducing gas compensation comprising a; steam injection pipe (19) for supplying high-temperature steam in case of ignition failure of the pilot burner (6).

Description

Tar removing device for reducing gas temperature compensation burner {DEVICE FOR REMOVING THE TAR OF BURNER FOR RECOMPENSING DEOXIDATION GAS}

The present invention relates to a device that can easily and automatically remove the tar condensed in the burner installed for the reduction gas temperature compensation between the reactor in the flow reduction reactor, more specifically in the molten iron manufacturing process using ordinary coal and iron ore Reduced gas temperature compensation burner which can increase burner operation rate and improve maintainability of burner facility by automatically removing tar condensed in temperature compensation burner by tar and fuel gas containing tar The tar removal apparatus of the present invention.

In general, the blast furnace method, which constitutes a large scale of molten iron production equipment, has a certain strength or more due to the characteristics of the reactor, and is limited to raw materials having a particle size that can ensure the ventilation of the furnace. As a carbon source used as a fuel and a reducing agent, Coke processed with specific raw coal is used, and as an iron source, it mainly depends on sintered ores or pellets which have undergone aggregation processes such as sintering and pelletizing, which are pretreatment processes.

Accordingly, the current blast furnace method must be accompanied by raw material pretreatment facilities such as coke production equipment, raw material coal, sintering facilities for the compaction of ores, pelletizing equipment, etc. The current blast furnace law's competitiveness is rapidly being encroached by the enormous investment costs for environmental pollution prevention facilities to overcome global regulations on environmental pollutants.

In order to cope with this situation, countries around the world directly use general coal as fuel and reducing agent, and as a source of iron, they are spurring the development of new steelmaking process that manufactures molten iron by directly using spectroscopy that occupies more than 80% of the world's ore production. Is adding.

In the molten iron manufacturing equipment which uses the conventional general coal and spectroscopy directly related to such a technique, AT2096 / 92 etc. which are pending patent application in Austria are known.

According to the above publication, the overall process according to the known technique, the overall process is a three-stage flow reduction, such as a preheating furnace (4), preliminary reduction reactor (3) and final reduction reactor (2) as shown in FIG. The furnace 100 is composed of a molten gasifier (1) in which a coal-filled layer is formed, and the spectroscopy at room temperature charged through the ore charge tube (14) continuously into the upper preheating furnace (4) is described above. By contacting the high temperature reducing gas supplied from the melt gasifier 1 while passing through the flow reduction path 100 of the stage, the gas is converted into a high temperature reducing spectrometer having a temperature rise and 90% or more reduction, and discharged. The reduced spectroscopy is continuously charged into the molten gasifier 1 in which the coal packed layer is formed through the ore charge tube 24 and melted in the coal packed layer to be converted into molten iron, thereby converting the molten gasifier 1 into the molten gasifier 1. It is elected to the outside.

In addition, in the molten gasifier 1, the bulky coal is continuously supplied from the upper part of the furnace to form a coal filling layer having a predetermined height inside the furnace, and a plurality of air vents formed at the bottom of the outer wall into the coal filling layer. Oxygen is blown through and the coal in the coal packed bed is burned, and the combustion gas is converted into a high temperature reducing gas while rising the packed bed and then discharged to the outside of the molten gasifier 1 to reduce the flow of the three stages. It is supplied to the furnace 100.

In addition, the movement between the preheating furnace 2, the preliminary reduction reactor 3, and the final reduction reactor 4 of the ore passing through the three-stage flow reduction reactor 100 is connected to adjacent furnaces 1,2,3 It is made through the ore charge pipe (11) (12) (13), and in the charge pipe (11) (12) (13) from the flow path of the lower flow to the flow path of the lower flow by the upper and lower pressure difference Ore flows formed from the flow reduction path at the top to the flow reduction path at the bottom are formed to cross each other by the flow of the high temperature reducing gas formed and the gravity.

On the other hand, the high temperature reduction gas supplied to the three-stage flow reduction reactor 100 through the first, second, third and third gas supply lines 21, 22, 23 from the melt gasifier 1 is a three-stage The temperature gradually decreases due to a lot of heat loss while flowing through the fluid reduction reactor (100), and in preparation for this case, at present, the preheating furnace (4), the preliminary reduction reactor (3) and the final reduction reactor (2) Burners 31, 32, and 33 are provided to provide a heat source using oxygen to compensate for the temperature of the reducing gas passing through the gas supply lines 21, 22 and 23.

That is, as the high temperature reducing gas from the melt gasifier 1 passes through the gas supply line 23, its temperature decreases due to heat loss and the reducing gas whose temperature decreases passes through the burner 33. The high temperature reducing gas is again supplied to the final reduction path (2). In this process, when the high-temperature reducing gas containing tar passes through the burner 33 by the temperature decrease due to heat loss, the tar is condensed on the iron surface of the burner 33.

Of course, the tar is condensed only when the burner 33 is temporarily stopped due to abnormal operating conditions, and between the final reduction path 2 and the preliminary reduction path 3 and the preliminary reduction path ( The same applies to the burners 31 and 32 mounted on the first and second gas supply lines 21 and 22 connecting between 3) and the preheating furnace 4.

Here, each of the burners 31, 32, 33 is in the form of a double tube, as shown in Figure 2, the main burner (5) in which oxygen is blown, and when the oxygen is blown, It consists of a pilot burner (6) to play a role, the pilot burner (6) is assembled in the main burner (6), and supplies a mixed gas mixed with fuel gas (COG) and air (air) It consists of a body and the end of the ignition electrode (8) responsible for the ignition of the mixed gas and the flame detector (7) for detecting whether the mixed gas ignition.

On the other hand, the reducing gas supplied to the burners 31, 32, 33 mounted at the front end of each reactor (2) (3) (4) by the combustion and gasification of the coal in the melt gasifier (1) As a result, a large amount of vaporized tar is present in the gas reduced to a high temperature, and the vaporized tar condenses in the ignition device in the burners 31, 32 and 33 having a relatively low temperature. do.

Accordingly, when the vaporized tar condenses on the ignition device inside the burners 31, 32 and 33, the burner may be damaged due to instability of the system or a defect in the external equipment of the burners 31, 32 and 33. The burner is directly exposed to the reducing gas containing tar in the situation in which the 31, 32 and 33 are temporarily suspended. In this case, the ignition is not performed properly when the burners 31, 32 and 33 are re-ignited. Cause problems.

That is, when the vaporized tar contained in the reducing gas is condensed at the end of the ignition electrode 8, which is an ignition device of the burners 31, 32, 33, an electrical spark for fuel ignition is not formed. If the tar is condensed, each of the burner parts 31, 32, and 33 ignition device, which is poor in ignition, should be removed from the gas supply lines 21, 22 and 23, and then remounted. In addition, it takes a long time, and it is not only difficult to remove and attach the defective part at high temperature, but also, in severe cases, may cause the operation to stop.

Accordingly, the present invention has been made in order to solve the above problems, the object is to burn in the ignition device in the operation state of the burner installed in the flow reduction furnace for manufacturing molten iron using direct coal and iron ore ore directly To remove tar from outside by detecting condensation from outside automatically and without removing work, and to provide tar removal device of reducing gas temperature compensation burner that can prevent operation stop or operation delay due to burner's inability to restart. .

1 is a schematic diagram showing a flow reduction path employed in a typical molten iron manufacturing equipment,

Figure 2 is a longitudinal cross-sectional view showing a tar removal apparatus of the burner for reducing gas temperature compensation according to the present invention.

* Explanation of symbols for the main parts of the drawings *

1 ..... Melt Gasification Furnace 2 ..... Final Reduction Furnace

3 ..... preliminary reduction furnace 4 ..... preheating furnace

5 ..... Main Burner 6 ..... Pilot Burner

7 ..... Flame Detector 8 ..... Ignition Electrode

9 ..... Resistance Detector 10 .... Signal Generator

18 .... solenoid valve 19 .... steam inlet pipe

21,22,23 ..... 1,2,3 Gas Supply Line

31,32,33 ..... Burner

The present invention as a technical configuration for achieving the above object,

A plurality of burners composed of a main burner in which oxygen is injected, a pilot burner in which fuel gas and air are blown, an ignition electrode responsible for ignition of the mixed gas, and a flame detector that detects ignition are reduced. Flows mounted on the first, second and third gas supply lines connecting between the melt gasifier and the final reduction path, between the final reduction path and the preliminary reduction path, and between the preliminary reduction path and the preheating path to compensate for the gas temperature. In the reduction furnace,

A resistance sensor for detecting a resistance generated between the anode ends of the ignition electrode and measuring a resistance value; a signal generator for generating an operation signal based on the resistance value of the resistance sensor; and an end portion of the pilot burner; And a steam inlet pipe extending into the main burner so that the outlet ends thereof correspond to each other, and having a solenoid valve opened and closed by an operation signal of the signal generator to supply hot steam when the pilot burner is not ignited. By providing a tar removal device of the reducing gas compensation burner to be.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

Figure 2 is a longitudinal cross-sectional view showing a tar removal device of the burner for reducing gas compensation according to the present invention, the tar removal device 20 of the present invention is a preheating furnace (4), preliminary reduction path (3) and the final reduction path ( 2) each burner which is mounted on the first, second and third gas supply lines 21, 22, 23 for supplying the reducing gas to the side and provides a heat source to compensate for the temperature decrease temperature of the reducing gas passing therethrough ( By simply removing condensed tar, which is provided in 31, 32 and 33, which acts as a cause of ignition failure, as a heat source of high temperature steam, such a device 20 includes a resistance sensor 9, a signal generator ( 10) and the steam blowing pipe (19).

That is, the resistance detector 9 is electrically connected to the ignition electrode 8 which is one of the important ignition apparatuses that ignite the mixed gas mixed with fuel gas and air by generating a spark by receiving power from the outside. It is to detect the resistance generated between the anode end of the ignition electrode (8), and to measure the sensed resistance.

Here, the ignition electrode (8) is composed of two to constitute the anode end, in order to form an electrical spark in the ignition electrode (8) to ignite the mixed gas, the resistance value of both ends should be 80㏀ or more. When the resistance value is 80 kPa or less, the electric spark is difficult to form and the mixed gas is not ignited. Accordingly, in order to provide a heat source in the burners 31, 32, and 33 to compensate for the temperature of the reducing gas which is normally reduced in temperature, the resistance at both ends of the ignition electrode 8 is always maintained at 80 kPa or more. It must be done. However, when the tar contained in the reducing gas is condensed in the ignition device such as the ignition electrode 8, the resistance generated is reduced to 50 kΩ or less, and in severe cases, the resistance does not appear at all. May also occur.

In addition, the signal generator 10 electrically connected to the resistance sensor 9 is based on a measured value and a set resistance value generated by the resistance sensor 9 at the ignition electrode 8 during ignition. By generating the operation signal for opening and closing the solenoid valve 18 of the steam intake pipe 19 to be described later.

On the other hand, the steam blown pipe 19, which is supplied with high temperature steam, is a pilot in which tar contained in the reducing gas flowing through the first, second, and third gas supply lines 21, 22, 23 is mainly condensed. The ignition electrode 8, which is the end of the burner 6, and the outlet end where steam is injected extend from the outside into the main burner 5 so as to correspond to each other, and in the middle of the length, the operation signal of the signal generator 10 is applied. It is equipped with a solenoid valve 18 for opening / closing by controlling the flow of high temperature steam.

Accordingly, when the solenoid valve 18 is opened by the open signal of the signal generator 10, hot steam is injected from the outlet end to the end side of the pilot burner 6 to remove the condensed tar, When the resistance value between the ignition electrodes 8 returns normally after the tar is removed, the solenoid valve 18 is closed by the closing signal of the signal generator 10 to automatically stop the steam supply.

Referring to the operation and effect of the present invention having the configuration as described above are as follows.

First, as the high-temperature reducing gas from the melt gasifier 1 passes through the first, second and third gas supply lines 21, 22 and 23, the temperature is decreased by heat loss. Reduced reducing gas passes through each burner (31) (32) (33) which provides a heat source when the mixed gas is ignited, and again becomes a high-temperature reducing gas and is supplied to the upper reduction furnace side.

In this process, when a high-temperature reducing gas containing tar passes through the burners 31, 32 and 33 by the temperature decrease due to heat loss, an important ignition device of the burners 31, 32 and 33 Tar is condensed on the end of the phosphor pilot burner 6 or on the surface of the ignition electrode 8, or the burners 31, 32, 33 are temporarily stopped and passed through due to instability of the system or defects in the burner external equipment. When the tar contained in the reducing gas is condensed, when the burners 31, 32 and 33 are ignited to provide a heat source for compensating the temperature of the reduced reducing gas, the ignition electrode is caused by the condensed tar. In (8), no electric spark for ignition occurs and no ignition of mixed gas occurs.

That is, the spark electrode 8 is fired every time a spark is generated to ignite the mixed gas in the resistance sensor 9 electrically connected to both ends of the ignition electrode 8 of each burner 31, 32, 33. The resistance at both ends is always measured, and the measured resistance is converted into a signal of 4 to 20 kHz, which is a signal of a general control measuring device, and transmitted to the signal generator 10 side, from which the resistance sensor 9 When a value of 80 kΩ or less is difficult to be input to the signal generator 10 in which a signal is received, it is determined that the burners 31, 32 and 33 are ignited by the condensation of tar. Since the signal generator 10 determines the opening signal, the signal generator 10 transmits an open signal to the solenoid valve 18 mounted on the steam inlet pipe 19 to which hot steam is supplied.

When the solenoid valve 18 in which such an open signal is continuously received is opened, steam of the steam injection pipe 19 extending to the pilot burner 6 through the main burner 5 is transferred to the ignition electrode 8. At the outlet end of the steam intake pipe (19) located close to) is injected toward the electrode to remove the condensed tar as a heat source of hot steam.

The steam injected from the steam intake pipe 19 is continuously injected until the resistance value measured by the resistance detector 9 becomes 80 kPa or more, which can sufficiently generate an ignition electric spark, and the ignition electrode When the resistance value generated at both ends of (8) is 80 kΩ or more, the signal from the signal generator 10 is cut off and the solenoid valve 18 which has been opened is closed so that the steam inlet pipe 19 The steam flow is blocked to stop the steam injection.

On the other hand, the opening / closing operation of the solenoid valve 18 for controlling the steam flow in the steam intake pipe 19 for removing tar condensed in the ignition device of the burner determines whether the pilot burner 6 is ignited. Can be controlled by the flame detection signal of the flame detector 7.

That is, the solenoid valve 18 maintains the closing operation when the detection signal of the flame detector 7 for detecting the ignition flame of the mixed gas by the appropriate ignition electric spark maintains the closing operation to supply steam through the steam inlet pipe 19. When the resistance value generated at the anode end of the ignition electrode 8 is 80 kΩ or less due to the condensation of tar, the ignition spark of the mixed gas is not properly formed in the spark detector 7. When not detected, the solenoid valve 18 is opened to continuously supply steam until the tar acting as an unignition cause is removed through the steam intake pipe 19, and upon completion of tar removal, as described above. The steam supply through the steam inlet pipe 19 is stopped.

According to the present invention as described above, a resistance sensor for measuring the resistance at the ignition electrode, a signal generator for generating the opening and closing signal based on the received resistance value, and steam injection of the high temperature steam flows by the opening signal The steam flow of the pipe is equipped with a solenoid valve to prevent condensed tar, which acts as a cause of unignition, as a heat source of the hot steam supplied from the steam blowing pipe when tar is condensed on the burner ignition device and the ignition is not performed. As it can be easily removed, the condensed tar can be easily cleaned in the assembled state without the need to take out the ignition device condensed with the tar as in the prior art, so that the work is easy, the time required for work is reduced, and smooth and stable restarting is possible. It is possible to perform continuous operation without interruption of operation and can significantly improve work productivity.

Claims (3)

The main burner 5 into which oxygen is blown, the pilot burner 6 into which fuel gas and air are blown, the ignition electrode 8 responsible for ignition of the mixed gas, and the flame detector 7 which senses whether or not to ignite. Between the melt gasifier 1 and the final reduction path 2, the final reduction path so that a plurality of burners 31, 32, 33 configured to compensate for the temperature of the reducing gas generated in the melting gasifier 1 (2) and the first and second gas supply lines 21, 22 and 23 connected between the preliminary reduction path (3) and the preliminary reduction path (3) and the preheating path (4). In the flow reduction path 100, A resistance detector 9 for detecting a resistance generated between the anode ends of the ignition electrode 8 and measuring a resistance value; and a signal generator for generating an operation signal based on the resistance value of the resistance detector 9. (10); and the solenoid valve 18 extending into the main burner 5 so that the end and the outlet end of the pilot burner 6 correspond to each other, and are opened and closed by an operation signal of the signal generator 10. And a steam intake pipe (19) for supplying high-temperature steam in the event of ignition failure of the pilot burner (6); tar removal apparatus of the burner for reducing gas compensation, characterized in that the configuration. The method of claim 1, The signal generator 10 transmits an open signal to the solenoid valve 18 side of the steam inlet pipe 19 to which high temperature steam is supplied when a value of 80 kΩ or less is input from the resistance sensor 9, and the The tar removal device of the burner for reducing gas compensation, characterized in that for transmitting a closing signal to the solenoid valve (18) when a value of 80 kΩ or more is input from the resistance sensor (9). delete