KR20010064939A - Apparatus for sensing expansion of element and cooling element - Google Patents

Abstract

PURPOSE: An apparatus for sensing damage of an expansion in a hot stove and cooling the same is provided to prevent a large scale facility accident in advance by early detecting the conditions of an element during heating installed at the connecting pipes of the hot stove and cooling the element so that damage is not further developed. CONSTITUTION: The apparatus for sensing and cooling heating of an expansion in a hot stove comprises a heating detection means equipped with a plurality of detecting switches (61-66) for detecting whether heat is generated or not at each parts of an element (24) in a circumferential direction, wherein one or more heat detecting switches are installed between each of the elements of a plurality of expansion parts; cooling means a plurality of which are installed between the elements so that nitrogen is supplied to the concerned zone when heating of the elements is detected at the specific zone by the heating detection means, wherein the cooling means receive nitrogen through the nitrogen purge lines; and a process computer (110) controlling operation of the cooling means so as to cool the concerned zone of the heating detected elements by judging heating detecting positions of the heating detected expansions and the concerned elements after receiving the detecting results of the heating detection means.

Description

Hot-air furnace expansion damage detection and cooling device {APPARATUS FOR SENSING EXPANSION OF ELEMENT AND COOLING ELEMENT}

The present invention relates to expansion damage detection and a cooling device, and more particularly, by contraction and expansion of a mixed-cooling room contact tube and a hot contact shear contact tube that produce high temperature hot air to supply molten iron in a blast furnace to produce molten iron. An expansion damage detection and cooling device configured to automatically cool an element by detecting an element part damage when the internal edge is abnormal.

1 is a system diagram showing a schematic configuration of a conventional hot stove facility. As shown in FIG. 1, in general, in a blast furnace, a mixed gas obtained by mixing BFG (Blast Furnace Gas) and COG (Coke Oven Gas) in a hot blast furnace is heated to a temperature of 1300 ° C. After storing the high heat of ˜1550 ° C. in the heat storage chamber 5, the hot air at 1200 ° C. is transferred to the furnace through the hot air main building 1 to produce molten iron using iron ore and coke in the furnace.

Therefore, when the hot air flow 2 is opened (hereinafter referred to as blowing) and also when the hot air flow 2 is closed (hereinafter referred to as combustion), the hot air flow 2 shear contact tube and The passing amount of hot air passing through the mixed cooling chamber 3 is around 6200 Nm 3 / Min, and the operation of the hot air blowing sent to the blast furnace at a pressure of about 4.0 kg / cm 2 is advanced.

Figure 2 shows a schematic diagram showing a cooling method when heating the expansion pipe connecting a conventional hot stove. As shown in FIG. 2, in particular, in the case of a mixed-cooling room contact tube, the heat change width (about 100 ° C.) during combustion and blowing is large, so that internal smoke, cracks, and partial dropouts occur, and the heat passing through the sleeve 27 is a fireproof material. Since it is directly transmitted to the element 24 through the element 25, when the local redness and heat generation of the element 24 occurs, the inspector installs a nitrogen line 31 to distribute nitrogen to the nitrogen distribution 33. After sending the rubber hose from the nitrogen distribution nipple (34) is installed in the heat generating portion and the glowing portion and then open the blocking valve to cool.

In this case, if the heat generation is continued, the hot blast furnace is stopped and the pressurization operation using the mortar material is performed to remove the cause of the heat generation.

However, in this case, if the inspector does not find it early, it may lead to an operation interruption due to the cracking and breakage of the element, and secondly, a large amount of gas inside the furnace is reversed, and the poisoning accident of the worker is predicted. Although it occurs, there is a problem in reality because of the continuous working relationship to confirm early.

Accordingly, the present invention has been made in order to solve the above-mentioned conventional problems, the object of which is the element installed in the hot blast valve shear contact pipe and the mix-chamber contact pipe of the hot stove facility operating continuously It is to provide an expansion damage detection and cooling device that can detect the heat and redness of the condition early to allow the cooling to prevent further damage from occurring, thereby preventing a large accident of the facility in advance.

1 is a system diagram showing a schematic configuration of a conventional hot stove facility.

Figure 2 shows a schematic diagram showing a cooling method when heating the expansion pipe connecting a conventional hot stove.

Figure 3 shows a perspective view of a hot stove expansion pipe (Expansion) damage detection device for implementing the present invention.

Figure 4 shows a detailed installation of the hot stove heating unit cooling apparatus for implementing the present invention.

Figure 5 shows the installation detail of the hot stove expansion heat detection and cooling apparatus according to the present invention.

6 is a flowchart illustrating an operation of a hot stove expansion heat generation detection and a cooling apparatus according to the present invention.

Explanation of symbols on the main parts of the drawings

11-14 ... expansion, 24 ... element,

41 ~ 46 ... cooling pipe, 41a ~ 46a: connection pipe,

51 to 56 nitrogen supply valve, 55 nitrogen purge line,

57 ... nitrogen distributor, 58 ... nitrogen mainline,

61 ~ 66 ... heat detection switch, 71 ~ 76 ... signal conversion unit,

100 control panel, 110 process computer,

120 ... monitor.

Expansion damage detection and cooling device according to the present invention in order to achieve the above object when the heat generation and heat generation of the elements of the expansion of the expansion portion provided in the mixed-cooling room contact pipe and hot air front shear contact pipe for producing and supplying high temperature hot air into the blast furnace In the hot stove expansion heat detection and cooling device to supply nitrogen to the corresponding element through the nitrogen purge line to cool,

At least one heat separation means provided between at least one of the elements of each of the expansion units and having a plurality of detection switches to detect whether heat is generated at each circumferential portion of the element;

Cooling means provided with a plurality between the elements to supply nitrogen to the corresponding zone when the heat detection for the specific zone of the element by the exothermic detection means, each of which is supplied with nitrogen through the nitrogen purge line;

A process computer for controlling the operation of the cooling means to perform cooling on the region of the element in which heat is detected by determining the expansion where the heat is detected and the heat detecting position of the element by receiving the detection result of the heat detecting means; Characterized in that provided with.

Hereinafter will be described in detail with reference to the accompanying drawings the configuration and effects of the expansion damage detection and cooling apparatus according to an embodiment of the present invention.

Figure 3 shows a perspective view of a hot stove expansion pipe (Expansion) damage detection device for implementing the present invention. As shown in FIG. 3, the hot stove expansion tube damage detection apparatus for implementing the present invention includes the first and second expansions 11 and 12 of the front end of the hot air shift and the third and fourth expansions of the mixed-cooling chamber contact tube ( 13) There are a plurality of heat detection switches 61 to 66 for detecting whether the element 24 is divided into six equal parts in the circumferential direction in the center of the three valleys, for example, the expansion according to the heat at regular intervals. 6 are installed, and each of the heating detection switches 61 to 66 has a cable connected to each other and is extended to six signal conversion units 71 to 76 installed in the conversion unit.

The first and second expansions 11 and 12 at the front of the hot stove and the third and fourth expansion portions 13 and 14 of the mixed-cooling chamber contact pipe have the largest shrinkage and expansion width during the blowing and combustion of the hot stove. In the case of falling off and partial detachment of the lead, the local high temperature heat is directly exerted, so that local heat is generated, and if the rapid cooling is not performed, cracks and breakage of the element occurs in a short time.

Therefore, when the element is inflated due to local heating, the heating detection switches 61 to 66 are turned on (when it is always off, and when it is always on, it is off when it is expanded due to heat). Will be detected.

At this time, the exothermic detection switch (61 ~ 66) is installed to detect the damage caused by the heat of the element 24 is preferably installed in one of the center bone of the three bones of the element 24, The installation position is not limited.

On the other hand, Figure 4 shows a detailed installation of the hot stove heating unit cooling apparatus for implementing the present invention, Figure 5 shows a detailed installation of the hot stove expansion heating detection and cooling apparatus according to the present invention. As shown in FIGS. 4 and 5, when heat generation for a portion of the element 24 is detected by the heat detection switches 61 to 66, it is necessary to cool the element quickly due to an abnormality of the internal edge. There is. Therefore, cooling pipes 41 to 46 each having a constant length are installed at six positions outside the valleys of the three elements by rounding by the angle of the element. At this time, the installation position and the installation position of the cooling pipes 41 to 46 are determined corresponding to the installation position and installation position of the detection switch. On the other hand, the openings on both sides of the cooling pipes 41 to 46 are sealed, and the lower part of the rounded cooling pipe is drilled a plurality of cooling holes (not shown) by a predetermined distance and the center portion of the upper side of the cooling pipe rounded. In the opening to extend the connection pipes 41a to 46a connecting the three cooling pipes to communicate with each other. In one embodiment of the present invention, as shown in Figure 4, the cooling pipes 41 to 46 having a predetermined length in six places in the circumferential direction of the element, the length of each of the cooling pipes (41 to 46) It is set so as to correspond to the installation interval between the detection switches 61 to 66, and the center of the cooling pipes 41 to 46 is located above the detection switches 61 to 66.

On the other hand, a nitrogen purge line for supplying nitrogen to the cooling pipes 41 to 46 from the nitrogen distributor 57 is connected to the openings of the connection pipes 41a to 46a, respectively on the nitrogen purge lines 41 to 46, respectively. Nitrogen supply valves 51 to 56 which are turned on / off according to the control signal of the operation control unit 100 to perform nitrogen supply and supply cutoff are formed. Meanwhile, the nitrogen distributor 57 is connected to the nitrogen main line 58 to distribute and supply nitrogen supplied through the nitrogen main line 58 to each nitrogen purge line 55 as necessary.

On the other hand, the signal detected by the heat detection switch (61 ~ 66) installed to the outside of the expansion element 24 is converted into a predetermined signal form through a signal converter so that the computer can recognize it is input to the operation control unit (100). In this case, the operation control unit 100 determines the corresponding part where the heating of the element is generated according to the signal input from the signal converters 71 to 76 and inputs the corresponding signal to the process computer 110. The process computer 110 detects the position of the element 24 having generated heat, outputs the detected element position through the monitor 120, and determines the position of the cooling pipes 41 to 46 for cooling the corresponding area. The control signal is output to the operation control unit 100 to turn on the nitrogen supply valves 51 to 56 to supply nitrogen to the cooling pipe. In this case, the operation control unit 100 turns off the nitrogen supply valves 51 to 56 according to the signal output from the process computer 110 to supply nitrogen to the cooling pipes 41 to 46 to generate heat. The zone will cool down.

3 to 5 illustrate the configuration of the heating detection switch and the cooling device installed in one element, but the present invention is not limited thereto. Exothermic detection and cooling according to the elements of the third expansion and the fourth expansion 13 and 14 of the second expansion 11 and 12 and the mixed-cooling chamber contact pipe are performed.

6 is a flowchart illustrating an operation of a hot stove expansion heat generation detection and a cooling apparatus according to the present invention. As shown in FIG. 6, the hot stove expansion heat generation detecting and cooling apparatus according to the present invention starts the progress of the sequence by first turning on the control power in step S10. At this time, in the step (s15) to detect whether the first and second expansion 11, 12 installed in the front of the hot stove hot air and the third and fourth expansion unit (13) (140) installed in the mixing chamber contact pipe. In order to detect the heat generation, the heat detection switch 61 to 66 is set to an available state.

At this time, during the operation of the heating detection switches 61 to 66 at step s20, the first and second expansion 11 and 12 expansion pipes and the third and fourth expansion portions 13 and 14 of the mixed-cooling chamber contact pipe are performed. It is determined whether the element is heated by the heat detection switches 61 to 66 respectively installed on the elements 24 of the element. At this time, when the corresponding part of the element is expanded due to local heating at a specific part of the element, the heating detection switch (eg, the heating detection switch, which is always off contact) is turned on and outputs an on signal to the signal converter. Therefore, in the process computer 110, when such a heat detection signal is determined in at least one or more locations of the heat detection switches 61 to 66, the process proceeds to step s25 to recognize the corresponding part and to notify the driver of an alarm and at the same time ( In operation s30, a timer for counting the cooling time is operated.

In the next step (s35) to determine the cooling pipe installed in the corresponding region of the heating element is generated to open the corresponding nitrogen supply valve to supply nitrogen to the cooling pipe (41 ~ 46). On the other hand, if heat generation is detected in all regions of the element, the control signal for opening all nitrogen supply valves to the combustion control unit is output, and nitrogen is supplied to each cooling pipe through the nitrogen purge line 55 to cool the corresponding part. To help.

At this time, the nitrogen supplied from the nitrogen main line 58 is distributed to the corresponding nitrogen purge line open in the nitrogen distributor 57 and supplied, and the nitrogen supplied to the nitrogen purge line is connected to the pipe as the nitrogen supply valve is opened. 41a to 46a are supplied to the cooling pipes 41 to 46, and the cooling pipe cools the exothermic element region by releasing nitrogen through the cooling holes formed at the lower side. At this time, if the corresponding area of the element that was generated by the supply of nitrogen is cooled, the expanded portion of the element is contracted by cooling. When the element cools down normally and the element contracts, the switch contact of the heating detection switch returns to the off state. Therefore, in step S40, it is determined whether the cooling is completed by detecting whether the heating detection switch is turned off, and when the cooling is completed, proceed to the next step (s50) to cut off nitrogen supplied to the cooling pipe. The nitrogen supply valve will be closed.

However, if cooling is not completed even though cooling nitrogen is supplied through the cooling pipe in order to cool the portion where heat is generated, the process proceeds to step s50 to set the time counted by the timer as a preset reference time example. If the counted time is more than 30 minutes compared to 30 minutes, a warning is generated to the driver. In the next step (s55), the operation of the hot stove facility is stopped to switch to the idle state, and then the mortar is indented in the step (s60). Forced cooling to cool the element.

Expansion damage detection and cooling apparatus according to the present invention is not limited to the above-described embodiment can be carried out in various modifications within the scope of the technical idea of the present invention.

As described above, the expansion damage detection and cooling device according to the present invention generates heat in the expansion part due to the change of the lead and the expansion zone in the process of repeating the combustion and blowing process without the need for the driver's field occupation in remote operation of the blast furnace hot stove facility. And it is possible to detect whether the red light early. In addition, when the heat generation and redness of the expansion unit is detected, the driver is alerted and nitrogen purging is performed to prevent the element from cracking and breaking. In addition, when the element is damaged, the efficiency of the fire and the management of the equipment due to the release of a large amount of hot air can be achieved, and a practical effect of reducing the inspection load on the site can be obtained.

Claims (4)

Hot air to cool and supply nitrogen to the corresponding element through the nitrogen purge line in the case of heat generation and redness of the elements of the expansion part of the expansion chamber and the hot air front shear contact tube to produce high temperature hot air and supply it to the blast furnace. In the low expansion heat detection and cooling device, At least one heat separation means provided between at least one of the elements of each of the expansion units and having a plurality of detection switches to detect whether heat is generated at each circumferential portion of the element; Cooling means provided with a plurality between the elements to supply nitrogen to the corresponding zone when the heat detection for the specific zone of the element by the exothermic detection means, each of which is supplied with nitrogen through the nitrogen purge line; A process computer for controlling the operation of the cooling means to perform cooling on the region of the element in which heat is detected by determining the expansion where the heat is detected and the heat detecting position of the element by receiving the detection result of the heat detecting means; Hot stove expansion heating and cooling device characterized in that it comprises a. The heat generating means according to claim 1, wherein It is formed in the element portion of each expansion, formed between the valleys of each element portion is divided into a plurality in the circumferential direction and installed in a plurality at regular intervals, the switch contact point is switched during the expansion of the element due to the heating to output the heat detection signal Each of the heating detection switch is a hot stove expansion heating detection and cooling device characterized in that the output signal is detected by a signal converter that is connected to the cable is pulled out and converts the input signal into a computer control signal and outputs the signal. . The method of claim 1, wherein the cooling means A plurality of cooling pipes installed at each valley of each element of the expansion and having a predetermined length and rounded by an angle of the elements, and closed at both sides of the openings, and a rounded upper center portion of the cooling pipes; A plurality of cooling pipes are connected to communicate with each other, and the other side thereof includes a connection pipe connected to a nitrogen purge line, and a plurality of cooling holes formed at predetermined intervals are formed at a rounded lower side of the cooling pipe to form the nitrogen purge line. Hot stove expansion heat detection and cooling device characterized in that the nitrogen supplied through it can be released. 4. The cooling pipe of claim 3, wherein the cooling pipes are respectively formed in positions and numbers corresponding to the installation position and the installation location of the heating detection switch, and the process computer determines the heating portion of the element detected by the heating detection switch. Hot air expansion expansion and detection device, characterized in that for opening the nitrogen supply valves respectively formed on the nitrogen purge line to supply cooling nitrogen to the cooling pipe installed in the site.