Thermal regulation tool and thermal regulation method for gas flow at the bottom of coke oven vertical fire channel

Abstract

The invention relates to a hot state regulating tool and a hot state regulating method for the air supply flow at the bottom of a vertical flue of a coke oven. The hot state regulating tool comprises a cooling blowing device and an operating rod; the cooling blowing device consists of a cooling fan, a cooling air duct, a cooling sleeve and a positioner; the cooling sleeve consists of a handheld section, an air inlet section and a working section connected in sequence; the operating rod consists of a handle, a connecting rod and a hook head connected in sequence; the invention realizes the regulating operation of the air supply flow at the bottom of the vertical flue at any time in a high temperature environment during the hot production process of the coke oven through the coordinated application of the cooling blowing device and the operating rod; the hot state regulating tool has a simple structure, is easy to manufacture and is convenient to operate.

Description

Technical Field

[0001] The invention relates to the technical field of coke ovens, and in particular to a hot state regulating tool and a hot state regulating method for the gas supply flow at the bottom of a vertical flume of a coke oven. Background Art

[0002] In the coke oven production process, especially in the production process of large-volume coke ovens using multi-stage heating technology, it is necessary to ensure that the coke cake matures evenly along the length of the carbonization chamber and the height of the carbonization chamber. This requires the coke oven combustion chamber to have a good horizontal temperature distribution and good high-direction heating uniformity. In actual production, when the coke cake matures unevenly in any direction, it is necessary to adjust the heating uniformity of the combustion chamber. The adjustment method includes hot adjustment of the gas supply flow at the bottom of the vertical fire channel, that is, adding and removing the adjustment bricks at the inclined entrance of the vertical fire channel. However, the bottom of the vertical fire channel is nearly ten meters away from the furnace top, and the working temperature is as high as 1300℃ or more. It is difficult to complete the adjustment work without the help of special tools. If the hot adjustment of the bottom gas supply flow is not completed in time, it will seriously affect the normal production of the coke oven.

[0003] Currently, none of the relevant patent documents disclosed have recorded any technical solution for regulating the gas supply flow at the bottom of the vertical flue of the coke oven under hot production.

[0004] The Chinese patent application number 201220443691.9 discloses "a coke oven regulating brick placement device". The device is equipped with a visualization system, which is expensive and clearly states that it is used for the placement of slidable regulating bricks at the top outlet of the segmented gas supply in the combustion chamber, rather than for the placement of regulating bricks at the inclined outlet of the combustion chamber. At the same time, the device is clearly used for later maintenance, and judging from the composition of its related components, it can only be used under cold conditions of the coke oven. Under hot and high-temperature production conditions of the coke oven, the device components, especially the visualization system, will be damaged due to high temperature and cannot be used.

[0005] The Chinese patent application number 201710390133.8 discloses "a device and method for placing regulating bricks at the inclined opening of a coke oven". This device is also equipped with a visualization system and has a relatively high cost. It also clearly states that the fire hole wall tube bricks must be completed on the top of the furnace and the vertical fire channel must be blown and cleaned before use. That is, it can only be used under cold conditions of the coke oven. If the coke oven is in hot and high-temperature production conditions, its visualization operating system will quickly be damaged and fail due to the high temperature.

[0006] The Chinese patent application with application number 201810331448.X discloses "a tool for adding regulating bricks for a downward-adjustable coke oven and a method of using the tool", which is provided with a lighting device, but is only suitable for adding regulating bricks for a downward-adjustable coke oven. For modern compartmentalized coke ovens, the heat storage chamber between the downward-adjusting hole and the combustion chamber is covered with lattice bricks, and an inclined ramp structure is arranged. No tool can pass through the heat storage chamber directly to the ramp opening at the bottom of the combustion chamber. Therefore, the device can only realize the addition of regulating bricks at the grate bricks of the small flue at the bottom of the heat storage chamber, but cannot realize the addition of regulating bricks at the bottom of the vertical fire channel, that is, it cannot realize the adjustment operation of the air supply flow at the bottom of the vertical fire channel. Summary of the invention

[0007] The present invention provides a hot state regulating tool and a hot state regulating method for the gas supply flow at the bottom of a vertical flue of a coke oven. Through the coordinated application of a cooling and blowing device and an operating rod, the gas supply flow at the bottom of the vertical flue can be regulated at any time in a high temperature environment during the hot production process of the coke oven. The hot state regulating tool has a simple structure, is easy to manufacture, and is convenient to operate.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A hot state regulating tool for the air supply flow at the bottom of the vertical flue of a coke oven comprises a cooling blowing device and an operating rod; the cooling blowing device consists of a cooling fan, a cooling air duct, a cooling sleeve and a positioner; the cooling sleeve consists of a hand-held section, an air inlet section and a working section connected in sequence, an opening is arranged at the outer end of the hand-held section, a cooling air inlet is arranged on the air inlet section, a cooling air outlet is arranged at the outer end of the working section, and a positioner is arranged at the outer side of the working section; the air outlet of the cooling fan is connected to the air inlet of the cooling air duct, and the air outlet of the cooling air duct is connected to the cooling air inlet on the cooling sleeve; the operating rod consists of a handle, a connecting rod and a hook head connected in sequence; the length of the operating rod is greater than the length of the cooling sleeve; when working, one end of the hook head of the operating rod extends from the hand-held section of the cooling sleeve and passes through the cooling air outlet of the cooling sleeve to perform the hooking or placing operation of the regulating brick, and the hook head of the operating rod cooperates with the hook hole on the regulating brick.

[0010] The air inlet section is composed of an expansion section and a necking section. The inner diameter of the expansion section is larger than the inner diameter of the working section. One or more cooling air inlets are arranged on the end surface of the expansion section away from the working section. One or more cooling air ducts are arranged corresponding to the cooling air inlets. The inner diameter of the large end of the necking section is the same as the inner diameter of the expansion section, and the inner diameter of the small end is the same as the inner diameter of the working section.

[0011] The positioner is an annular body, which is sleeved on the outside of the working section of the cooling sleeve and can slide axially along the working section. The outer diameter of the positioner is larger than the diameter of the fire viewing hole, and a positioning bolt is set on the positioner.

[0012] The cooling air duct is a flexible duct.

[0013] The cooling fan and the cooling air duct, as well as the cooling air duct and the cooling sleeve are all detachably connected.

[0014] The inner diameter of the cooling sleeve is larger than the maximum width of the regulating brick at the inclined opening of the vertical fire channel, and the outer diameter of the working section on the cooling sleeve is smaller than the inner diameter of the fire viewing hole.

[0015] The method for thermally regulating the gas flow rate at the bottom of the vertical flue of a coke oven is implemented by using a thermal regulating tool; the specific steps are as follows:

[0016] 1) Loosen the positioning bolts on the cooling sleeve, and adjust the position of the positioner according to the distance A between the bottom of the vertical fire channel and the furnace top, so that the distance B between the bottom surface of the positioner and the end surface of the air outlet of the working section is less than A, and AB = 0.3m ~ 1.0m; after the adjustment is completed, lock the positioner on the working section with the positioning bolts;

[0017] 2) Open the fire viewing hole cover, and place one end of the cooling air outlet of the cooling jacket vertically downward into the corresponding vertical fire channel, and clamp it at the fire viewing hole through the positioner to make the distance between the cooling air outlet of the cooling jacket and the inclined channel opening relatively fixed;

[0018] 3) Start the cooling fan;

[0019] 4) When the vertical fire channel has a downward airflow, the air supply flow at the bottom of the vertical fire channel of the coke oven is adjusted by moving the regulating brick through the operating lever; there are two situations:

[0020] a. When reducing the gas flow at the bottom of the vertical fire channel of the coke oven, install the regulating brick on the hook of the operating rod, hold the handle with one end of the hook facing downward, vertically insert the operating rod from the opening on the handheld section into the cooling jacket, slowly move it downward along the cooling jacket, and place the regulating brick to the set position at the inclined channel; retract the operating rod, turn off the cooling fan, retract the cooling jacket, and close the fire viewing hole cover;

[0021] b. When pre-increasing the gas flow at the bottom of the vertical fire channel of the coke oven, hold the handle with one end of the hook facing downward, insert the operating rod vertically into the cooling sleeve from the opening on the holding section, and slowly move it downward along the cooling sleeve so that the hook hooks the adjusting brick to be retracted; move the adjusting brick upward along the cooling sleeve with the operating rod, retract the operating rod, retract the adjusting brick, turn off the cooling fan, retract the cooling sleeve, and close the fire viewing hole cover.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1) According to the needs, the gas supply flow at the bottom of the vertical flue can be adjusted at any time in the high temperature environment during the hot production process of the coke oven to increase or decrease the gas supply flow at the bottom of the vertical flue;

[0024] 2) The operator only needs to stand in the operation area on the top of the furnace to easily adjust the air flow at the bottom of the vertical fire channel. The operating environment is safe and the operation process is simple;

[0025] 3) The thermal regulation of the air supply flow at the bottom of the vertical fire channel is achieved by the use of a cooling blowing device in conjunction with an operating rod. The cooling blowing device is used to reduce the temperature of the operating area during the operation process. The cooling blowing device has a simple structure, and each component is detachably connected, which is very convenient to move, disassemble, assemble and store.

[0026] 4) The thermal state regulating tool has a simple structure, is easy to manufacture, has a low manufacturing cost, is reusable, and has a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the cooling and blowing device of the present invention.

[0028] Figure 2 yes Figure 1 AA view of the .

[0029] Figure 3 It is a structural schematic diagram of the operating rod of the present invention.

[0030] Figure 4 It is a schematic diagram of the outer diameter dimensions of the fire viewing hole, working section and positioner described in the present invention.

[0031] Figure 5 It is a schematic diagram of the thermal regulation process described in Example 1 of the present invention.

[0032] Figure 6 It is a schematic diagram of the thermal regulation process described in Example 2 of the present invention.

[0033] In the figure: 1. Cooling fan 2. Cooling fan outlet 3. Handheld section 4. Air inlet section 5. Working section 6. Cooling air inlet 7. Positioner 8. Positioning bolt 9. Cooling air duct 10. Fire viewing hole seat 11. Handle 12. Connecting rod 13. Hook 14. Fire viewing hole 15. Furnace top 16. Vertical fire channel 17. Adjustment brick 18. Inclined channel 19. Regenerator 20. Vertical fire channel partition wall DETAILED DESCRIPTION

[0034] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings:

[0035] The hot state regulating tool for the gas flow rate at the bottom of the vertical flue of the coke oven of the present invention comprises a cooling and blowing device and an operating rod; Figure 1-Figure 2As shown, the cooling blowing device is composed of a cooling fan 1, a cooling air duct 9, a cooling sleeve and a positioner 7; the cooling sleeve is composed of a hand-held section 3, an air inlet section 4 and a working section 5 connected in sequence, the outer end of the hand-held section 3 is provided with an opening, the air inlet section 4 is provided with a cooling air inlet 6, the outer end of the working section 5 is provided with a cooling air outlet, and the outer side of the working section 5 is provided with a positioner 7; the air outlet 2 of the cooling fan 1 is connected to the air inlet of the cooling air duct 9, and the air outlet of the cooling air duct 9 is connected to the cooling air inlet 6 on the cooling sleeve; as shown Figure 3 As shown, the operating rod is composed of a handle 11, a connecting rod 12 and a hook head 13 connected in sequence; the length of the operating rod is greater than the length of the cooling sleeve; when working, one end of the hook head 13 of the operating rod extends from the hand-held section 3 of the cooling sleeve and passes through the cooling air outlet of the cooling sleeve to perform the hooking or placing operation of the adjustment brick 17, and the hook head 13 of the operating rod cooperates with the hook hole on the adjustment brick 17.

[0036] The air inlet section 4 is composed of an expansion section and a necking section. The inner diameter of the expansion section is larger than the inner diameter of the working section 5. One or more cooling air inlets 6 are arranged on the end surface of the expansion section away from the working section 5; one or more cooling air ducts 9 are arranged corresponding to the cooling air inlets 6; the inner diameter of the large end of the necking section is the same as the inner diameter of the expansion section, and the inner diameter of the small end is the same as the inner diameter of the working section 5.

[0037] The positioner 7 is an annular body, which is sleeved on the outside of the cooling sleeve working section 5 and can slide axially along the working section 5. The outer diameter of the positioner 7 is larger than the diameter of the fire viewing hole 14 (such as Figure 4 As shown), a positioning bolt 8 is set on the positioner 7.

[0038] The cooling air duct 9 is a flexible pipe.

[0039] The cooling fan 1 and the cooling air duct 9, as well as the cooling air duct 9 and the cooling sleeve are all detachably connected.

[0040] The inner diameter of the cooling sleeve is larger than the maximum width of the adjusting brick 17 at the inclined opening of the vertical fire channel 16, and the outer diameter of the working section 5 on the cooling sleeve is smaller than the inner diameter of the fire viewing hole 14 (such as Figure 4 shown).

[0041] The method for thermally regulating the gas flow rate at the bottom of the vertical flue of a coke oven is implemented by using a thermal regulating tool; the specific steps are as follows:

[0042] 1) Loosen the positioning bolts 8 on the cooling sleeve, and adjust the position of the positioner 7 according to the distance A between the bottom of the vertical fire channel 16 and the furnace top 15, so that the distance B between the bottom surface of the positioner 7 and the end surface of the air outlet of the working section 5 is less than A, and AB = 0.3m ~ 1.0m; after the adjustment is completed, the positioner 7 is locked and fixed on the working section 5 by the positioning bolts 8;

[0043] 2) Open the fire viewing hole cover, and place the cooling air outlet end of the cooling jacket downward vertically into the corresponding vertical fire channel 16, and clamp it at the fire viewing hole 14 through the positioner 7, so that the distance between the cooling air outlet of the cooling jacket and the inclined channel opening is relatively fixed (such as Figure 5 shown);

[0044] 3) Start cooling fan 1;

[0045] 4) When the vertical flue 16 is in a downward airflow, the air supply flow at the bottom of the vertical flue of the coke oven is adjusted by moving the regulating brick 17 through the operating rod; there are two situations:

[0046] a. When reducing the gas flow rate at the bottom of the vertical fire channel 16 of the coke oven, install the regulating brick 17 on the hook head 13 of the operating rod, hold the handle 11 with one end of the hook head 13 facing downward, vertically insert the operating rod from the opening on the handheld section 3 into the cooling jacket, slowly move it downward along the cooling jacket, and place the regulating brick 17 at the set position at the inclined channel entrance (such as Figure 6 As shown); retract the operating lever, turn off the cooling fan 1, retract the cooling sleeve, and close the fire viewing hole cover;

[0047] b. When pre-increasing the air supply flow at the bottom of the vertical fire channel 16 of the coke oven, hold the handle 11 with one end of the hook head 13 facing downward, vertically insert the operating rod from the opening on the hand-held section 3 into the cooling sleeve, and slowly move it downward along the cooling sleeve so that the hook head 13 hooks the adjusting brick 17 to be retracted; move the adjusting brick 17 upward along the cooling sleeve with the operating rod, retract the operating rod, retract the adjusting brick 17, turn off the cooling fan 1, retract the cooling sleeve, and close the fire viewing hole cover.

[0048] like Figure 4 As shown, a fire-viewing hole seat 10 is provided outside the fire-viewing hole 14, the diameter of the fire-viewing hole 14 is R2, the outer diameter of the working section 5 is R1, and the outer diameter of the positioner 7 is R3, then R3>R2>R1. A plurality of positioning bolts 8 can be provided, and are evenly arranged along the circumference of the positioner 7.

[0049] The following examples are implemented on the premise of the technical solution of the present invention, and provide detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.

[0050] [Example]

[0051] like Figure 5 As shown, in this embodiment, the coke oven is a 6-meter non-sectioned coke oven. During the production process, the temperature distribution in a certain combustion chamber is uneven, and the gas supply flow at the bottom of the individual vertical fire channel 16 needs to be increased, that is, the regulating bricks 17 at the inclined openings of the individual vertical fire channels 16 need to be removed.

[0052] When the vertical fire channel 16 to be adjusted has a downward airflow, the fire viewing hole cover is opened, and the hot state regulating tool for the gas supply flow at the bottom of the vertical fire channel of the coke oven of the present invention is used to perform the hooking operation of the target regulating brick.

[0053] The specific steps are as follows:

[0054] Step 1, preparing a hot state regulating tool for the gas flow rate at the bottom of the vertical fire channel of the coke oven;

[0055] Step 2, open the fire viewing hole cover, vertically place the cooling sleeve into the corresponding vertical fire channel 16, loosen the positioning bolt 8, and when the bottom of the cooling sleeve is aligned with the inclined channel opening ( Figure 4 When the distance between the top opening of the ramp 18 shown in the figure is about 0.5 meters, tighten the positioning bolt 8 and clamp it at the fire viewing hole 14 through the positioner 7 to make the distance between the cooling air outlet of the cooling jacket and the ramp opening relatively fixed;

[0056] Step 3, start the cooling fan 1;

[0057] Step 4, holding the handle 11, insert the operating rod vertically into the cooling jacket, slowly move the hook head 13 down along the cooling jacket to the inclined opening, and hook the designated adjustment brick 17;

[0058] Step 5, retract the operating lever, retract the adjusting brick 17, turn off the cooling fan 1, retract the cooling sleeve, and close the fire viewing hole cover.

[0059] For ease of operation, in this embodiment, the placement of the cooling jacket and the operating rod is performed while standing on a ladder.

[0060] In this embodiment, the hot state regulating tool for the gas flow at the bottom of the vertical flume of the coke oven of the present invention is used to adjust the brick hooking operation, which improves the efficiency by more than 30%, is safe and simple to operate, and ensures the normal production of the coke oven.

[0061] [Example 2]

[0062] like Figure 6 As shown, in this embodiment, the coke oven is a 7-meter segmented coke oven. A certain combustion chamber heats the adjacent carbonization chamber unevenly in the vertical direction, and the coke at the bottom is over-ripe. It is necessary to reduce the gas supply flow at the bottom of the coke oven vertical fire channel, that is, it is necessary to add regulating bricks at the inclined openings of all the vertical fire channels in the combustion chamber.

[0063] When there is a downward airflow in the vertical fire channel 16 to be adjusted, the fire viewing hole cover is opened, and the hot state adjustment tool for the air supply flow at the bottom of the vertical fire channel of the coke oven according to the present invention is used to place the target adjustment bricks.

[0064] The specific steps are as follows:

[0065] Step 1, preparing a hot state regulating tool for the gas flow rate at the bottom of the vertical fire channel of the coke oven;

[0066] Step 2, open the fire viewing hole cover, vertically place the cooling jacket into the corresponding vertical fire channel 16, loosen the positioning bolt 8, and when the distance between the bottom of the cooling jacket and the inclined channel opening is about 0.5 meters, tighten the positioning bolt 8, and clamp it at the fire viewing hole 14 through the positioner 7, so that the cooling air outlet of the cooling jacket and the inclined channel opening are relatively fixed;

[0067] Step 3, start the cooling fan 1;

[0068] Step 4, install the adjustment brick 17 on the hook head 13, hold the handle 11 and vertically insert the operating rod into the cooling jacket, slowly move the adjustment brick 17 downward along the cooling jacket, and finally place it at the designated position of the ramp entrance;

[0069] Step 5, retract the operating lever, turn off the cooling fan 1, retract the cooling sleeve, and close the fire viewing hole cover.

[0070] For ease of operation, in this embodiment, the placement of the cooling jacket and the operating rod is performed while standing on a ladder.

[0071] In this embodiment, the hot state regulating tool for the gas flow at the bottom of the vertical flume of the coke oven of the present invention is used to adjust the brick placement operation, which improves the efficiency by more than 40%, is safe and simple to operate, and ensures the normal production of the coke oven.

[0072] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A thermal regulating tool for the gas flow at the bottom of the vertical flue of a coke oven, characterized in that: It comprises a cooling air blowing device and an operating rod; the cooling air blowing device is composed of a cooling fan, a cooling air duct, a cooling sleeve and a positioner; the cooling sleeve is composed of a handheld section, an air inlet section and a working section connected in sequence, an opening is arranged at the outer end of the handheld section, a cooling air inlet is arranged on the air inlet section, a cooling air outlet is arranged at the outer end of the working section, and a positioner is arranged at the outer side of the working section; the positioner is an annular body, which is sleeved on the outer side of the working section of the cooling sleeve and can slide axially along the working section, the outer diameter of the positioner is larger than the diameter of the fire viewing hole, and a positioning bolt is arranged on the positioner; the inner diameter of the cooling sleeve is larger than the inner diameter of the fire viewing hole, and the cooling sleeve is provided with a positioning bolt ... outer end of the cooling sleeve is provided with an opening, and the cooling air inlet is arranged on the outer end of the working section. The maximum width of the brick is adjusted at the inclined opening of the vertical fire channel, and the outer diameter of the working section on the cooling sleeve is smaller than the inner diameter of the fire viewing hole; the air outlet of the cooling fan is connected to the air inlet of the cooling air duct, and the air outlet of the cooling air duct is connected to the cooling air inlet on the cooling sleeve; the operating rod is composed of a handle, a connecting rod and a hook head connected in sequence; the length of the operating rod is greater than the length of the cooling sleeve; when working, one end of the hook head of the operating rod extends from the handheld section of the cooling sleeve and passes through the cooling air outlet of the cooling sleeve to perform the hooking or placing operation of the adjustment brick, and the hook head of the operating rod cooperates with the hook hole on the adjustment brick.

2. The hot state regulating tool for the gas flow rate at the bottom of the vertical flue of a coke oven according to claim 1, characterized in that: The air inlet section is composed of an expansion section and a necking section. The inner diameter of the expansion section is larger than the inner diameter of the working section. One or more cooling air inlets are arranged on the end surface of the expansion section away from the working section. One or more cooling air ducts are arranged corresponding to the cooling air inlets. The inner diameter of the large end of the necking section is the same as the inner diameter of the expansion section, and the inner diameter of the small end is the same as the inner diameter of the working section.

3. The hot state regulating tool for the gas flow rate at the bottom of the vertical flue of a coke oven according to claim 1 or 2, characterized in that: The cooling air duct is a flexible duct.

4. The hot state regulating tool for the gas flow rate at the bottom of the vertical flue of a coke oven according to claim 1, characterized in that: The cooling fan and the cooling air duct, as well as the cooling air duct and the cooling sleeve are all detachably connected.

5. A method for thermally regulating the gas flow rate at the bottom of a coke oven vertical flue, characterized in that: The method is implemented by using the thermal state adjustment tool as described in any one of claims 1 to 4; the specific steps are as follows: 1) Loosen the positioning bolts on the cooling sleeve, and adjust the position of the positioner according to the distance A between the bottom of the vertical fire channel and the furnace top, so that the distance B between the bottom surface of the positioner and the end surface of the air outlet of the working section is less than A, and AB=0.3m~1.0m; after the adjustment is completed, lock the positioner on the working section with the positioning bolts; 2) Open the fire viewing hole cover, and place the cooling air outlet of the cooling jacket vertically downward into the corresponding vertical fire channel, and clamp it at the fire viewing hole through the positioner to make the distance between the cooling air outlet of the cooling jacket and the inclined channel opening relatively fixed; 3) Start the cooling fan; 4) When the vertical fire channel has a downward airflow, the air supply flow at the bottom of the vertical fire channel of the coke oven is adjusted by moving the regulating brick through the operating lever; there are two situations: a. When reducing the gas flow at the bottom of the vertical fire channel of the coke oven, install the regulating brick on the hook of the operating rod, hold the handle with one end of the hook facing downward, vertically insert the operating rod from the opening on the handheld section into the cooling jacket, slowly move it downward along the cooling jacket, and place the regulating brick to the set position at the inclined channel; retract the operating rod, turn off the cooling fan, retract the cooling jacket, and close the fire viewing hole cover; b. When pre-increasing the gas flow at the bottom of the vertical fire channel of the coke oven, hold the handle with one end of the hook facing downward, insert the operating rod vertically into the cooling sleeve from the opening on the holding section, and slowly move it downward along the cooling sleeve so that the hook hooks the adjusting brick to be retracted; move the adjusting brick upward along the cooling sleeve with the operating rod, retract the operating rod, retract the adjusting brick, turn off the cooling fan, retract the cooling sleeve, and close the fire viewing hole cover.

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