Mounting structure and method capable of replacing thermocouple on cooling wall of blast furnace on line

Abstract

The invention relates to a mounting structure capable of replacing a thermocouple on a blast furnace cooling stave on line, which comprises a protective tube, a protective outer cover, an outer cover flange, a short tube and a short tube flange, the protective tube is inserted into the cooling stave and is in threaded connection with the cooling stave, the protective outer cover sleeves the outer side of the protective tube, one end of the protective outer cover is welded and fixed with a furnace shell, and the other end of the protective outer cover is welded and fixed with the furnace shell. An outer cover flange is fixed at the other end of the protective outer cover, one end of the short tube is connected with the protective outer cover through the outer cover flange, and the thermocouple is inserted into the protective tube from the short tube and is connected with the short tube through the short tube flange. Compared with the prior art, the invention has the following beneficial effects: 1) installation and disassembly are convenient and fast, and online replacement and fast maintenance can be realized; 2) the condition of the cooling wall can be detected more timely in the later period of furnace service, and the service life of the cooling wall is prolonged to further prolong the service life of the blast furnace; and 3) the investment cost is saved. The application range is wide, and the matching degree is high. The method is suitable for cooling walls of various sections.

Description

Technical Field

[0001] The invention belongs to the technical field of blast furnace ironmaking, and in particular relates to an installation structure and method capable of online replacing a blast furnace cooling wall thermocouple. Background Art

[0002] Cooling staves are very important in blast furnace production. Cooling staves of corresponding materials can be installed at different parts of the furnace body, which can be roughly divided into cast iron and copper cooling staves. Regardless of the type of cooling stave installed, the body or ribs of the cooling stave must be temperature-monitored. Thermocouples are usually inserted into the cooling stave to achieve the temperature measurement effect. Due to the uninterrupted use of the cooling stave or other reasons, the life of the thermocouple is usually shorter than that of the cooling stave. This will make the temperature measurement point of the cooling stave unable to be used normally, which is a great challenge for the monitoring of the later stage of the on-site furnace campaign.

[0003] The galvanic protection tube used in traditional blast furnaces is directly welded to the furnace shell and cannot be replaced online. If the galvanic protection tube is damaged, the corresponding temperature measurement point can only be invalidated. The galvanic protection device of the present invention can make the galvanic protection tube inserted into the cooling wall not welded to the furnace shell and can be flexibly pulled out. When the thermocouple is damaged, the thermocouple can be replaced online. Summary of the invention

[0004] The purpose of the present invention is to provide an installation structure and method for online replacement of blast furnace cooling wall thermocouples. When the cooling wall thermocouple is damaged, it is not necessary to wait until the cooling wall is replaced before replacing the thermocouple, and the cooling wall thermocouple can be replaced online. The present invention can avoid delays in on-site operations caused by failure to timely detect abnormal cooling wall temperature due to failure to replace the cooling wall thermocouple in time. It is beneficial for blast furnace production operators to accurately judge and adjust the state of the blast furnace cooling wall, help to extend the service life of the blast furnace cooling wall, and increase the generation life of the blast furnace, thereby generating higher economic value.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A mounting structure capable of online replacement of thermocouples of a blast furnace cooling wall, comprising a protection tube, a protection cover, a cover flange, a short tube, and a short tube flange. The protection tube is inserted into the cooling wall and is threadedly connected to the cooling wall. The protection cover is sleeved on the outside of the protection tube and one end of the protection cover is welded and fixed to the furnace shell. The other end of the protection cover is fixed with a cover flange. One end of the short tube is connected to the protection cover via the cover flange. The thermocouple is inserted into the protection tube from the short tube and is connected to the short tube via the short tube flange.

[0007] A gasket is welded and fixed to the outer side of the protective outer cover, and is welded and fixed to the furnace shell through the gasket.

[0008] A thermocouple replacement method using an installation structure for online replacement of a blast furnace cooling stave thermocouple comprises the following contents:

[0009] 1) Insert the protection tube into the required temperature measurement part (body or rib) of the cooling wall. The protection tube is connected to the cooling wall by threaded connection. The thread at the front end of the protection tube must match the thread at the temperature measurement part of the cooling wall. The protection tube is only screwed and fixed to the cooling wall, and there is no welding with the furnace shell or other parts.

[0010] 2) After the protection tube is installed, put the protective cover on the outside of the protection tube, and weld the protective cover with the inner side of the gasket, and then weld the outer side of the gasket to the furnace shell.

[0011] 3) After the protective cover is installed, connect the short tube to the protective cover, install the thermocouple into the short tube, and connect it to the thermocouple through the short tube flange.

[0012] Through the above three steps, one temperature measuring point of the cooling wall can be installed, and then the other temperature measuring points can be completed according to the design requirements.

[0013] 4) When the temperature measuring point is damaged and needs to be replaced, remove the flange bolts at both ends of the short tube and remove the short tube; unscrew the protective tube and the thermocouple inside the tube; put the new thermocouple into the new protective tube, and then screw the protective tube into the cooling wall; then tighten the flanges at both ends of the short tube, and the replacement is complete.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1) Easy and quick installation and disassembly, enabling online replacement and quick maintenance.

[0016] 2) In the later stage of the furnace service, the condition of the cooling wall can be detected more timely, which can extend the service life of the cooling wall and thus extend the life of the blast furnace.

[0017] 3) Save investment costs.

[0018] 4) Wide application range and high matching degree. Applicable to all sections of cooling wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] Figure 2 It is a schematic diagram of 11-point thermocouples arranged according to the present invention.

[0021] Figure 3 The diagram is a schematic diagram of a thermocouple using the replaceable structure of the present invention and the original non-replaceable structure.

[0022] In the figure: 1. Protection tube; 2. Protection outer cover; 3. Gasket; 4. Outer cover flange; 5. Short pipe; 6. Short pipe flange; 7. Furnace skin; 8. Cooling wall; 9. Replaceable thermocouple; 10. Non-replaceable thermocouple. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the specific implementation methods of the present invention are further described below in conjunction with embodiments. The following embodiments are used to specifically illustrate the contents of the present invention. These embodiments are only general descriptions of the contents of the present invention and do not limit the contents of the present invention.

[0024] like Figure 1 As shown, an installation structure capable of online replacement of thermocouples of blast furnace cooling staves includes a protection tube 1, a protection outer cover 2, an outer cover flange 4, a short tube 5, and a short tube flange 6. The protection tube 1 is inserted into the cooling stave 8 and is threadedly connected to the cooling stave 8. The protection outer cover 2 is sleeved on the outside of the protection tube 1 and one end of the protection outer cover 2 is welded and fixed to the furnace shell 7. The other end of the protection outer cover 2 is fixed with the outer cover flange 4. One end of the short tube 5 is connected to the protection outer cover 2 through the outer cover flange 4. The thermocouple is inserted into the protection tube 1 from the short tube 5 and is connected to the short tube 5 through the short tube flange 6.

[0025] One end of the short tube 5 is fixedly connected to the outer cover flange 4 , and the other end is fixedly connected to a short tube flange 6 .

[0026] A gasket 3 is welded and fixed to the outer side of the protective outer cover 2 , and is welded and fixed to the furnace shell 7 via the gasket 3 .

[0027] A thermocouple replacement method using an installation structure for online replacement of a blast furnace cooling stave thermocouple comprises the following contents:

[0028] 1) Insert the protection tube 1 into the temperature measuring part (main body or rib) of the cooling wall 8. The protection tube 1 is connected to the cooling wall 8 by threaded connection. The thread at the front end of the protection tube 1 must match the thread at the temperature measuring part of the cooling wall 8. The protection tube 1 is only screwed and fixed to the cooling wall 8, and is not welded to other parts such as the furnace shell 7.

[0029] 2) After the protection tube 1 is installed, the protection cover 2 is put on the outside of the protection tube 1, and the protection cover 2 is welded and fixed with the inner side of the gasket 3, and the outer side of the gasket 3 is then welded and fixed with the furnace shell 7.

[0030] 3) After the protective cover 2 is installed, the short tube 5 is connected to the protective cover 2, and then the thermocouple is installed in the short tube 5 and connected to the thermocouple through the short tube flange 6.

[0031] Through the above three steps, one temperature measuring point of the cooling wall can be installed, and then the other temperature measuring points can be completed according to the design requirements.

[0032] 4) When the temperature measuring point is damaged and needs to be replaced, remove the flange bolts at both ends of the short tube 5 respectively, remove the short tube 5; unscrew the protection tube 1 and the thermocouple in the tube; put the new thermocouple into the new protection tube 1, and then screw the protection tube 1 into the cooling wall 8; then tighten the flanges at both ends of the short tube 5, and the replacement is completed.

[0033] The flange and fasteners in the present invention need to contain sealing materials.

[0034] The end of the protective outer cover 2 needs to maintain a certain distance from the end of the outer side of the furnace shell 7 of the protection tube 1 to facilitate the operation of replacing the thermocouple later.

[0035] The front thread of the protection tube 1 must match the thread of the temperature measuring part of the cooling wall 8. Generally, the diameter of the protection tube is D48, and the thread is Rp1 1 / 2". The furnace shell opening is generally D60. The specific detailed dimensions need to be designed according to the site conditions.

[0036] Thermocouples are generally arranged to have 8 to 12 temperature measuring points distributed radially on the cooling wall 8 of the furnace belly, furnace waist and lower part of the furnace body. The cooling wall 8 on the upper part of the furnace body is generally arranged with 8 points. The temperature measuring points can also be arranged with half of them being online replaceable thermocouples and half being traditional non-replaceable thermocouples. The number and arrangement of temperature measuring points can be determined according to the conditions of the blast furnace.

[0037] Figure 2 The layout of 11 thermocouples that can be replaced online is shown. Figure 3 The following diagram shows a mixed arrangement of 8-point online replaceable and non-replaceable. Other arrangements can refer to these two arrangements.

Claims

1. A mounting structure capable of replacing a blast furnace cooling stave thermocouple online, characterized in that: It includes a protective tube, a protective outer cover, an outer cover flange, a short tube, and a short tube flange. The protective tube is inserted into the cooling wall and is threadedly connected to the cooling wall. The protective outer cover is sleeved on the outside of the protective tube and one end of the protective outer cover is welded and fixed to the furnace shell. The other end of the protective outer cover is fixed with the outer cover flange. One end of the short tube is connected to the protective outer cover through the outer cover flange. The thermocouple is inserted into the protective tube from the short tube and is connected to the short tube through the short tube flange.

2. The installation structure capable of online replacement of blast furnace cooling stave thermocouples according to claim 1, characterized in that: A gasket is welded and fixed to the outer side of the protective outer cover, and is welded and fixed to the furnace shell through the gasket.

3. A method for replacing a thermocouple using the installation structure capable of replacing a blast furnace cooling stave thermocouple online as claimed in claim 1 or 2, characterized in that: Including the following: 1) Insert the protection tube into the temperature measurement position of the cooling wall, and screw the protection tube and the cooling wall together; 2) After the protection tube is installed, put the protection cover on the outside of the protection tube, and weld the protection cover with the inner side of the gasket, and then weld the outer side of the gasket to the furnace shell; 3) After the protective cover is installed, connect the short tube to the protective cover, install the thermocouple into the short tube, and connect it to the thermocouple through the short tube flange; 4) When the temperature measuring point is damaged and needs to be replaced, remove the flange bolts at both ends of the short tube and remove the short tube; unscrew the protective tube and the thermocouple inside the tube; put the new thermocouple into the new protective tube, and then screw the protective tube into the cooling wall; then tighten the flanges at both ends of the short tube, and the replacement is complete.

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