Installation and construction method of blast furnace cooling equipment

Abstract

An embodiment of the present invention discloses an installation and construction method for blast furnace body cooling equipment, comprising the following steps: Step 1: When the blast furnace shell is installed to the lower part of the furnace body, a protective shed is installed at the maximum diameter position of the upper part of the furnace belly belt, and while the furnace shell continues to be installed above the furnace body, the four sections of cooling walls from the hearth to below the tuyere begin to be installed; Step 2: After the furnace shell is installed, all remaining cooling walls and throat steel bricks are installed. The cooling walls installed by the present invention are firmly installed, densely installed inside the furnace shell, can work continuously for a long time, work stably, can continuously cool the furnace shell of the blast furnace, and improve the service life of the blast furnace.

Description

Technical Field

[0001] The invention relates to the field of blast furnace installation, in particular to an installation and construction method of blast furnace body cooling equipment. Background Art

[0002] The blast furnace is the main equipment for producing molten iron in steel enterprises. The blast furnace body consists of a furnace base, a frame, a furnace shell and cooling equipment. The service life of the blast furnace basically depends on whether the cooling equipment can work normally. Whether the cooling equipment can work normally depends on the installation and construction process and the material of the furnace body. The quality error of the furnace body material is very small. Therefore, whether the cooling device can work normally depends mostly on the installation and construction process. Summary of the Invention

[0003] The embodiment of the present invention provides an installation and construction method for blast furnace body cooling equipment, which improves the working stability of the cooling equipment and increases the service life of the blast furnace.

[0004] To achieve this purpose, the present invention provides the following technical solutions:

[0005] The installation and construction method of the blast furnace body cooling equipment comprises the following steps:

[0006] Step 1: When the blast furnace shell is installed to the lower part of the furnace body, install the protective shed at the maximum diameter position of the upper part of the furnace belly belt. While the furnace shell above the furnace body continues to be installed, the four sections of cooling wall from the hearth to below the tuyere begin to be installed;

[0007] Step 2: After the furnace shell is installed, install all the remaining cooling walls and throat steel bricks.

[0008] Furthermore, in step one, a DBQ4000 tower crane is used to hoist the cooling wall that has passed the water pressure test into the furnace shell through the hoisting hole in the middle part of the protective shed, and then the electric hoist installed on the protective shed is used in conjunction with a hand hoist to install the cooling wall piece by piece.

[0009] Furthermore, the cooling wall hoisting method is as follows:

[0010] Carry out position line calibration inside the furnace shell;

[0011] The construction workers inside the furnace shell pulled the cooling wall down from the top of the protective shed, while the construction workers outside the furnace shell used a 5t hoist to lift it. When the cooling wall reached the bottom, the construction workers inside the furnace shell pushed the cooling wall toward the furnace shell, while the construction workers outside the furnace shell used a 3t hoist to pull it horizontally onto the inner wall of the furnace shell for installation.

[0012] Correct the position of the cooling wall;

[0013] Detect the position of the cooling wall.

[0014] Furthermore, in step two, the cooling wall enters the furnace body from the furnace mouth. During construction, a set of sliding rails leading to the furnace mouth are set on the large platform on the top of the blast furnace upper frame in the 0° direction. The cooling wall is hoisted onto the sliding trolley by the main crane, and the cooling wall is transported to the furnace mouth. The cooling wall is then hoisted into the furnace by a winch. The construction workers use a 1t winch on the hoisting platform to pull the cooling wall to the installation position, and finally turn to use two 5t guide chains to install the cooling wall in place.

[0015] Furthermore, the cooling wall pressure test uses clean water as the test medium, maintains pressure and meets the leakage rate according to design requirements, and after the water pressure test is completed, the water in the cooling wall water pipe is discharged with compressed air.

[0016] Furthermore, a straight cooling wall and a plurality of wedge-shaped cooling walls are provided in each circle inside the furnace shell, and the wedge-shaped cooling walls are installed first and the straight cooling walls are installed last.

[0017] Furthermore, when calibrating the position line inside the furnace shell, the installation position and gap of the cooling wall are marked, the position of the cooling water pipe is measured according to the center of the cooling wall, and then reflected on the furnace shell, and checked with the corresponding factory-made openings on the furnace shell.

[0018] Furthermore, before installation, weld one or two cooling wall lugs on the cooling wall. After the installation inspection is passed, use gas cutting to cut off the cooling wall lugs 5 mm away from the end face of the cooling wall. The cooling wall must be facing the hot side downward.

[0019] Furthermore, after the cooling wall is installed and inspected and passed, the sealing plate, sealing box and corrugated expansion joint of the cooling water pipe are installed.

[0020] Furthermore, the cooling stave is a copper cooling stave. Before the copper cooling stave is hoisted, the following pre-installation is performed:

[0021] Before installing the cooling wall, put a sealing ring on the front end of the protective sleeve of the inlet and outlet water pipes;

[0022] Remove the copper screw plug of the lifting ring and install the lifting ring screw;

[0023] Remove the plastic plug from the screw hole;

[0024] After the initial hoisting is in place, adjust the correct position of the copper cooling stave, install the fixing bolts and temperature measuring tube, calibrate the correct position of the cooling stave, and check whether the radial clearance between the inlet and outlet water pipes and the furnace shell opening is not less than 6mm. If the radial clearance is not less than 6mm, tighten the nuts step by step in a staggered manner along the diagonal line, and check the changes of the cooling stave while tightening to ensure that the radial clearance between the water pipe and the furnace shell opening reaches more than 6mm. Check again after the whole circle is installed. If any part does not meet the above requirements, loosen the bolts again until it is adjusted properly.

[0025] Check whether the sealing rings of the protective sleeves of the inlet and outlet pipes are close to the furnace shell, and the sealing rings must have a certain amount of compression;

[0026] After the copper cooling wall is installed, the bolts and nuts, nuts and gaskets, gaskets and furnace shell are welded respectively, the temperature measuring tube is welded to the welding plate, and the welding plate is welded to the furnace shell. The welding must ensure good sealing and no gas leakage.

[0027] After the copper stave is positioned, remove the eye screws and screw in the copper plug. The plug should be lower than the upper end surface of the copper stave. After tightening the plug, fill the powdered carbon material from the φ10 center hole of the plug and compact it.

[0028] If the ends of some installation bolts are too long, they will be cut off in advance. After checking the integrity and reliability of each weld, the bolt sealing cover will be welded. The welding of the sealing cover and the furnace shell will also ensure that there is no gas leakage.

[0029] Compared with the prior art, the present invention has the following beneficial effects and significant improvements:

[0030] The cooling stave installed in the embodiment of the present invention is firmly installed and densely installed inside the furnace shell. It can work continuously for a long time and works stably. It can continuously cool the furnace shell of the blast furnace and increase the service life of the blast furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for the embodiments of the present invention.

[0032] Obviously, the drawings described below are only drawings of some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work, but these other drawings also belong to the drawings required for use in the embodiments of the present invention.

[0033] Figure 1 This is a schematic diagram of the cooling wall installation in step 1 of an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of position line calibration in a furnace shell according to an embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram of the cooling wall hoisting in step 1 of an embodiment of the present invention;

[0036] Figure 4 This is a schematic diagram of cooling wall correction in step 1 of an embodiment of the present invention;

[0037] Figure 5 This is a schematic diagram of cooling wall detection in step 1 of an embodiment of the present invention;

[0038] Figure 6 This is a schematic diagram of the cooling wall hoisting in step 2 of an embodiment of the present invention;

[0039] Figure 7 This is a schematic diagram of the traction movement of the cooling wall in step 2 of an embodiment of the present invention. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution, beneficial effects and significant improvements of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings provided in the embodiments of the present invention.

[0041] Obviously, all the embodiments described are only partial embodiments of the present invention, rather than all embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

[0042] It should be noted that the terms "first", "second" and "third" (if any) in the specification and claims of the present invention and the drawings of the embodiments of the present invention are only used to distinguish different objects, rather than to describe a specific order. In addition, the term "comprising" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0043] What needs to be understood is:

[0044] In the description of the embodiments of the present invention, terms such as "upper", "lower", "top", "bottom" and other indicative orientation or position words are only based on the orientation or position relationship shown in the drawings of the embodiments of the present invention. They are for the convenience of describing the embodiments of the present invention and simplifying the explanation, rather than indicating or implying that the device or element must have a specific orientation, specific orientation structure and operation. Therefore, they should not be understood as limiting the present invention.

[0045] In the present invention, unless otherwise clearly specified or limited, the terms "install", "connect", "fix" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, a movable connection, or an integrated connection; it can be a direct connection, an indirect connection through an intermediate medium, an invisible signal connection, or even an optical connection; it can be the internal connection between two elements or the interaction relationship between two elements, unless otherwise clearly specified or limited.

[0046] For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] It should also be noted that the following specific embodiments may be combined with each other, and the same or similar concepts or processes therein may not be repeated in some embodiments.

[0048] The technical solution of the present invention is described in detail below with reference to specific embodiments.

[0049] The embodiment of the present invention discloses a method for installing and constructing a blast furnace cooling device, comprising the following steps:

[0050] Step 1: When the blast furnace shell 1 is installed to the lower part of the furnace body, install the protective shed 2 at the maximum diameter position of the upper part of the furnace belly belt. While the furnace shell continues to be installed above the furnace body, start to install the four sections of cooling staves 3 from the hearth to below the tuyere;

[0051] Step 2: After the furnace shell is installed, install all the remaining cooling walls and throat steel bricks.

[0052] In one embodiment of the present invention, in step one, a DBQ4000 tower crane 4 is used to hoist the cooling wall that has passed the water pressure test into the furnace shell through the hoisting hole in the middle part of the protective shed, and then the electric hoist provided on the protective shed is used in conjunction with a hand hoist to install the cooling wall piece by piece in place.

[0053] In one embodiment of the present invention, the cooling stave hoisting method is as follows:

[0054] Carry out position line calibration inside the furnace shell;

[0055] The construction workers inside the furnace shell pull the cooling wall down from the top of the protective shed, and the construction workers outside the furnace shell use a 5t hoist 5 to lift it. When the cooling wall reaches the bottom, the construction workers inside the furnace shell push the cooling wall toward the furnace shell, and the construction workers outside the furnace shell use a 3t hoist 6 to pull it horizontally to the inner wall of the furnace shell for installation;

[0056] Correct the position of the cooling wall; use a crowbar 7 and a wedge 8 to adjust during the correction, and use a safety rope buckle 9 at one end of the wedge to retract the wedge 8.

[0057] Detect the position of the cooling wall.

[0058] Perform the following preparations before installation

[0059] ⑴ Before installation, the furnace shell reinforcement support, hanging ears and other accessories at the installation location must be cut off and polished flat;

[0060] ⑵ Carry out appearance inspection. The surface of the cooling equipment should be free of fine pores and defects, and the casting surface should be free of bubbles, trachoma, cracks and wrinkles;

[0061] ⑶ Weld the cooling wall hanging lugs at an appropriate distance from the installation location and set up the installation scaffolding;

[0062] (4) According to the different dimensions of each cooling wall, make cooling wall installation modules, and place the modules on the furnace shell;

[0063] (5) For cooling walls with brick support plates, the anchors at the brick support plates shall be welded and sprayed in advance according to the design requirements;

[0064] ⑹ Carry out ball passing and water pressure tests before installing the cooling wall according to the specifications.

[0065] In one embodiment of the present invention, in step 2, the cooling wall enters the interior of the furnace body from the furnace mouth. During construction, a set of sliding rails leading to the furnace mouth are set at 0° on the large platform on the top of the blast furnace upper frame. The cooling wall is hoisted onto the sliding trolley by the main crane, and the cooling wall is transported to the furnace mouth. The cooling wall is then hoisted into the furnace by a winch. The construction personnel use a 1t winch on the hoisting platform to pull the cooling wall to the installation position, and finally turn to use two 5t guide chains to install the cooling wall in place.

[0066] In one embodiment of the present invention, the cooling wall pressure test uses clean water as the test medium, maintains the pressure according to the design requirements and meets the leakage rate. After the water pressure test is completed, the water in the cooling wall water pipe is discharged with compressed air.

[0067] The back of the upper cooling wall of the furnace body is inlaid with carbon bricks. During the pressure test, necessary measures must be taken to ensure that the carbon bricks are not exposed to moisture.

[0068] In one embodiment of the present invention, a straight cooling stave and a plurality of wedge-shaped cooling staves are provided in each circle inside the furnace shell, and the wedge-shaped cooling staves are installed first and the straight cooling staves are installed last.

[0069] When installing the cooling wall, the installation bolts of the cooling wall should not be tightened until the installation elevation, levelness, wall gap, and adjacent difference of the cooling wall are adjusted.

[0070] After the cooling wall is installed, the cooling wall water pipe must not contact the edge of the furnace shell water pipe hole. The left and right distances between the water pipe and the water pipe hole should be as consistent as possible, and the distance to the upper part of the water pipe hole should be slightly smaller than the distance to the lower part.

[0071] In one embodiment of the present invention, when calibrating the position line in the furnace shell, the installation position and gap of the cooling wall are marked, the position of the cooling water pipe is measured according to the center of the cooling wall, and then reflected on the furnace shell and checked with the corresponding factory-made openings on the furnace shell.

[0072] In one embodiment of the present invention, before installation, one or two cooling wall lugs 10 are welded on the cooling wall 3. After the installation inspection is passed, the cooling wall lugs are cut off 5 mm away from the end face of the cooling wall by gas cutting. The cooling wall water pipe is not allowed to be hoisted under force. The cooling wall must be facing the hot side downwards and the cooling water pipe cannot be pressed underneath.

[0073] In one embodiment of the present invention, after the cooling wall is installed and inspected to be qualified, the sealing plate, sealing box and corrugated expansion joint of the cooling water pipe are installed.

[0074] In one embodiment of the present invention, the cooling stave is a copper cooling stave. Before the copper cooling stave is hoisted, the following pre-installation is performed:

[0075] Before installing the cooling wall, put a sealing ring on the front end of the protective sleeve of the inlet and outlet water pipes;

[0076] Remove the copper screw plug of the lifting ring and install the lifting ring screw;

[0077] Remove the plastic plug from the screw hole;

[0078] After the initial hoisting is in place, adjust the correct position of the copper cooling stave, install the fixing bolts and temperature measuring tube, calibrate the correct position of the cooling stave, and check whether the radial clearance between the inlet and outlet water pipes and the furnace shell opening is not less than 6mm. If the radial clearance is not less than 6mm, tighten the nuts step by step in a staggered manner along the diagonal line, and check the changes of the cooling stave while tightening to ensure that the radial clearance between the water pipe and the furnace shell opening reaches more than 6mm. Check again after the whole circle is installed. If any part does not meet the above requirements, loosen the bolts again until it is adjusted properly.

[0079] Check whether the sealing rings of the protective sleeves of the inlet and outlet pipes are close to the furnace shell, and the sealing rings must have a certain amount of compression;

[0080] After the copper cooling wall is installed, the bolts and nuts, nuts and gaskets, gaskets and furnace shell are welded respectively, the temperature measuring tube is welded to the welding plate, and the welding plate is welded to the furnace shell. The welding must ensure good sealing and no gas leakage.

[0081] After the copper stave is positioned, remove the eye screws and screw in the copper plug. The plug should be lower than the upper end surface of the copper stave. After tightening the plug, fill the powdered carbon material from the φ10 center hole of the plug and compact it.

[0082] If the ends of some installation bolts are too long, they will be cut off in advance. After checking the integrity and reliability of each weld, the bolt sealing cover will be welded. The welding of the sealing cover and the furnace shell will also ensure that there is no gas leakage.

[0083] In the description of the above manual:

[0084] The descriptions of terms such as "this embodiment", "an embodiment of the present invention", "as shown in...", "further", "a further improved technical sub-scheme", etc., mean that the specific features, structures, materials or characteristics described in the embodiment or example are included in at least one embodiment or example of the present invention; in this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example, and the specific features, structures, materials or characteristics described may be combined or combined in an appropriate manner in any one or more embodiments or examples; in addition, a person of ordinary skill in the art may combine or combine different embodiments or examples and features of different embodiments or examples described in this specification without causing any contradiction.

[0085] Finally, it should be noted that:

[0086] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same.

[0087] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein, and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention. Non-essential improvements, adjustments or replacements made by those skilled in the art based on the contents of this specification are all within the scope of protection required by the present invention.

Claims

1. The installation and construction method of blast furnace cooling equipment is characterized in that: The following steps are involved: Step 1: When the blast furnace shell is installed to the lower part of the furnace body, install the protective shed at the maximum diameter position of the upper part of the furnace belly belt. While the furnace shell above the furnace body continues to be installed, the four sections of cooling wall from the hearth to below the tuyere begin to be installed; Step 2: After the furnace shell is installed, install all the remaining cooling walls and throat steel bricks; The cooling stave is a copper cooling stave. Before the copper cooling stave is hoisted, the following pre-installation is carried out: Before installing the cooling wall, put a sealing ring on the front end of the protective sleeve of the inlet and outlet water pipes; Remove the copper screw plug of the lifting ring and install the lifting ring screw; Remove the plastic plug from the screw hole; After the initial hoisting is in place, adjust the correct position of the copper cooling stave, install the fixing bolts and temperature measuring tube, calibrate the correct position of the cooling stave, and check whether the radial clearance between the inlet and outlet water pipes and the furnace shell opening is not less than 6mm. If the radial clearance is not less than 6mm, tighten the nuts step by step in a staggered manner along the diagonal line, and check the changes of the cooling stave while tightening to ensure that the radial clearance between the water pipe and the furnace shell opening reaches more than 6mm. Check again after the whole circle is installed. If any part does not meet the above requirements, loosen the bolts again until it is adjusted properly. Check whether the sealing rings of the protective sleeves of the inlet and outlet pipes are close to the furnace shell, and the sealing rings must have a certain amount of compression; After the copper cooling wall is installed, the bolts and nuts, nuts and gaskets, gaskets and furnace shell are welded respectively, the temperature measuring tube is welded to the welding plate, and the welding plate is welded to the furnace shell. The welding must ensure good sealing and no gas leakage. After the copper stave is positioned, remove the eye screws and screw in the copper plug. The plug should be lower than the upper end surface of the copper stave. After tightening the plug, fill the powdered carbon material from the φ10 center hole of the plug and compact it. If the ends of some installation bolts are too long, they will be cut off in advance. After checking the integrity and reliability of each weld, the bolt sealing cover will be welded. The welding of the sealing cover and the furnace shell will also ensure that there is no gas leakage.

2. The installation and construction method of the blast furnace cooling equipment according to claim 1, wherein: In step one, a DBQ4000 tower crane is used to hoist the cooling wall that has passed the water pressure test into the furnace shell through the hoisting hole in the middle part of the protective shed. The electric hoist installed on the protective shed is then used in conjunction with a hand hoist to install the cooling wall piece by piece.

3. The installation and construction method of the blast furnace cooling equipment according to claim 2, characterized in that: The cooling wall hoisting method is as follows: Carry out position line calibration inside the furnace shell; The construction workers inside the furnace shell pulled the cooling wall down from the top of the protective shed, while the construction workers outside the furnace shell used a 5t hoist to lift it. When the cooling wall reached the bottom, the construction workers inside the furnace shell pushed the cooling wall toward the furnace shell, while the construction workers outside the furnace shell used a 3t hoist to pull it horizontally onto the inner wall of the furnace shell for installation. Correct the position of the cooling wall; Detect the position of the cooling wall.

4. The installation and construction method of the blast furnace cooling equipment according to claim 1, wherein: In step two, the cooling wall enters the furnace body from the furnace mouth. During construction, a set of sliding rails leading to the furnace mouth are set on the large platform on the top of the blast furnace upper frame at 0° direction. The cooling wall is hoisted onto the sliding trolley by the main crane, and the cooling wall is transported to the furnace mouth. The cooling wall is then hoisted into the furnace by a winch. The construction workers use a 1t winch on the hoisting platform to pull the cooling wall to the installation position, and finally turn to use two 5t guide chains to install the cooling wall in place.

5. The installation and construction method of the blast furnace cooling equipment according to claim 1, wherein: The cooling wall pressure test uses clean water as the test medium. The pressure is maintained according to the design requirements and the leakage rate is met. After the water pressure test is completed, the water in the cooling wall water pipe is discharged with compressed air.

6. The installation and construction method of the blast furnace cooling equipment according to claim 1, characterized in that: A straight cooling wall and multiple wedge-shaped cooling walls are set in each circle inside the furnace shell. The wedge-shaped cooling walls are installed first and the straight cooling walls are installed last.

7. The installation and construction method of the blast furnace cooling equipment according to claim 1, characterized in that: When calibrating the position line inside the furnace shell, mark the installation position and gap of the cooling wall. The position of the cooling water pipe is measured according to the center of the cooling wall, then reflected on the furnace shell, and checked with the corresponding factory-made openings on the furnace shell.

8. The installation and construction method of the blast furnace cooling equipment according to claim 1, characterized in that: Before installation, weld one or two cooling wall lugs on the cooling wall. After the installation inspection is passed, use gas cutting to cut off the cooling wall lugs 5mm away from the end face of the cooling wall. The cooling wall must be facing the hot side downwards.

9. The installation and construction method of the blast furnace cooling equipment according to claim 1, characterized in that: After the cooling wall is installed and inspected, the sealing plate, sealing box and corrugated expansion joint of the cooling water pipe are installed.

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