Waste gas treatment system in pre-oxidation furnace

Abstract

The utility model discloses a waste gas treatment system in a pre-oxidation furnace, and relates to the technical field of waste gas treatment, including a fixed base frame, a heat recovery box and a waste gas treatment box are fixed at the bottom wall position of the inner cavity of the fixed base frame, a partition plate is fixed at the middle position of the inner cavity of the waste gas treatment box, a first connecting pipe is fixedly inlaid at the upper end position of the partition plate, a second connecting pipe is fixed at the upper end position of the outer wall of one side of the waste gas treatment box, a third connecting pipe extending into the inner cavity of the waste gas treatment box is fixed on the outer wall of one side of the heat recovery box, and a foldable hose is fixedly connected at the end position of the third connecting pipe. When the utility model is in use, HCN, NH3 and CO2 generated inside the pre-oxidation furnace can be injected into the inner cavity of the waste gas treatment box through the third connecting pipe, wherein the concentrated sodium hydroxide solution can react with HCN and CO2 to be removed, and the concentrated sulfuric acid solution can react with NH3 to be removed, thereby treating the waste gas generated by the pre-oxidation furnace.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas treatment, in particular to a waste gas treatment system in a pre-oxidation furnace. Background Art

[0002] In the process of carbon fiber production, it is necessary to use a pre-oxidation furnace to pre-oxidize the fibers. In the process of processing the raw materials, the pre-oxidized fibers are dehydrated, dehydrogenated, and the main chain, side chain and terminal group are decomposed. Non-carbon elements such as H, O, N are released in the form of HCN, NH3, CO2, H2, N2 and H2O. These mixed high-temperature gases are highly polluting gases. Direct emission will affect the air quality of the surrounding environment, and the heat inside the mixed high-temperature gases will be lost in vain. For this reason, the utility model proposes an exhaust gas treatment system in a pre-oxidation furnace that is different from the prior art to solve the above technical problems. Utility Model Content

[0003] In order to improve the above-mentioned problem of discharging highly polluting gases such as HCN, NH3 and CO2 after treatment, the utility model provides a waste gas treatment system in a pre-oxidation furnace.

[0004] The utility model provides an exhaust gas treatment system in a pre-oxidation furnace, which adopts the following technical solutions:

[0005] The waste gas treatment system in the pre-oxidation furnace includes a fixed base frame, a heat recovery box and a waste gas treatment box are fixed at the bottom wall of the inner cavity of the fixed base frame, a partition plate is fixed at the middle position of the inner cavity of the waste gas treatment box, a first connecting pipe is fixedly inlaid at the upper end position of the partition plate, a second connecting pipe is fixed at the upper end position of the outer wall of one side of the waste gas treatment box, a third connecting pipe extending to the inner cavity of the waste gas treatment box is fixed on the outer wall of one side of the heat recovery box, a foldable hose is fixedly connected to the end position of the third connecting pipe, and pH sensors extending into the inner cavity of the waste gas treatment box are installed on both sides of the bottom wall of the fixed base frame.

[0006] By adopting the above technical scheme, HCN, NH3 and CO2 generated inside the pre-oxidation furnace can be injected into the inner cavity of the exhaust gas treatment box through the third connecting pipe, wherein the concentrated sodium hydroxide solution can react with HCN and CO2 to remove them, and the concentrated sulfuric acid solution can react with NH3 to remove them, thereby treating the exhaust gas generated by the pre-oxidation furnace. When the high-temperature exhaust gas flows through the inside of the third connecting pipe, the heat inside it can be transferred to the inner cavity of the heat recovery box, thereby recovering the heat of the high-temperature flue gas.

[0007] Optionally, a temperature sensor extending into the inner cavity of the heat recovery box is fixed to the bottom of one side of the fixed base frame, and a first discharge pipe penetrating the fixed base frame is fixed to the bottom wall of the heat recovery box.

[0008] By adopting the above technical solution, the temperature sensor can be used to conveniently detect the temperature of the fresh water in the inner cavity of the heat recovery box in real time. When the water temperature is too high, the control valve on the first discharge pipe is opened so that the water can be discharged through the first discharge pipe.

[0009] Optionally, second discharge pipes penetrating the fixed base frame are installed on both sides of the bottom wall of the exhaust gas treatment box, and pluggable soft plugs are provided on the top walls of the exhaust gas treatment box and the heat recovery box.

[0010] By adopting the above technical solution, clean water, concentrated sodium hydroxide and concentrated sulfuric acid liquid can be injected into the inner cavities of the heat recovery box and the exhaust gas treatment box respectively by pulling out the soft plug.

[0011] Optionally, a first mounting frame is installed at the lower end of the outer walls on both sides of the fixed base frame, and the two groups of the first mounting frames are penetrated by a second bolt. Threaded components are installed at the upper end of the outer walls of the exhaust gas treatment box and the heat recovery box, and the bottom positions of the two groups of the threaded components are rotatably connected to the second mounting frames through bearings, and the two groups of the second mounting frames are penetrated by a first bolt.

[0012] Optionally, the threaded assembly includes a threaded tube, which is fixed at the upper end of the outer wall of the exhaust gas treatment box and the heat recovery box. A threaded rod is threaded through the inner cavity of the threaded tube, and the bottom end of the threaded rod is rotatably connected to the top wall of the second mounting bracket through a bearing, and a handle is fixed at the top wall of the threaded rod.

[0013] Optionally, slideways are provided at the upper ends of the outer walls on both sides of the fixed base frame, and sliding blocks slidably connected to the slideways are fixed to the ends of the two groups of the second mounting frames.

[0014] By adopting the above technical solution, the second bolt and the first bolt are screwed to fix them to the installation vertical surface, which facilitates the fixing of the exhaust gas treatment system in the pre-oxidation furnace on the installation vertical surface. The screwing handle drives the threaded rod to rotate, and the threaded rod can move up and down during the rotation process under the action of the threaded tube. Under the action of the threaded rod, the second mounting frame is driven to move synchronously in the inner cavity of the slide through the slider, which facilitates the adjustment of the vertical spacing between the first bolt and the second bolt, and facilitates the flexible adjustment of the installation position according to the spacing of the screw holes on the installation vertical surface.

[0015] Optionally, a first transparent liquid level window is installed on the front side wall of the heat recovery box.

[0016] By adopting the above technical solution, the remaining amount of clean water in the inner cavity of the heat recovery box can be conveniently checked in real time under the action of the first transparent liquid level window.

[0017] Optionally, second transparent liquid level windows are installed on both sides of the front side wall of the exhaust gas treatment box.

[0018] By adopting the above technical solution, the residual amount of concentrated sodium hydroxide solution and concentrated sulfuric acid solution in the inner cavity of the waste gas treatment box can be conveniently checked in real time under the action of the second transparent liquid level window.

[0019] In summary, the present invention has at least one of the following beneficial effects:

[0020] HCN, NH3 and CO2 generated inside the pre-oxidation furnace can be injected into the inner cavity of the exhaust gas treatment box through the third connecting pipe, wherein the concentrated sodium hydroxide solution can react with HCN and CO2 to remove them, and the concentrated sulfuric acid solution can react with NH3 to remove them, thereby treating the exhaust gas generated by the pre-oxidation furnace. When the high-temperature exhaust gas flows through the inside of the third connecting pipe, the heat inside it can be transferred to the inner cavity of the heat recovery box, thereby recovering the heat of the high-temperature flue gas;

[0021] The threaded rod is driven to rotate by turning the handle, and the threaded rod can move up and down during the rotation process under the action of the threaded tube. The second mounting frame is driven to move synchronously in the inner cavity of the slide through the slider under the action of the threaded rod, so as to facilitate the adjustment of the vertical spacing between the first bolt and the second bolt, and facilitate the flexible adjustment of the installation position according to the spacing of the screw holes on the vertical installation surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the front cross-sectional structure of the utility model;

[0023] Figure 2 It is a front view structural schematic diagram of the utility model.

[0024] In the figure: 1. threaded pipe; 2. threaded rod; 3. first bolt; 4. second bolt; 5. first mounting bracket; 6. temperature sensor; 7. first discharge pipe; 8. fixed base frame; 9. PH sensor; 10. second discharge pipe; 11. first connecting pipe; 12. exhaust gas treatment box; 13. slider; 14. second mounting bracket; 15. slide; 16. handle; 17. second connecting pipe; 18. soft plug; 19. partition; 20. heat recovery box; 21. third connecting pipe; 22. foldable hose; 23. first transparent liquid level window; 24. second transparent liquid level window. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1-2 The utility model is described in further detail.

[0026] Please refer to the attached figure in the instruction manual Figure 1The utility model provides an embodiment: a waste gas treatment system in a pre-oxidation furnace, comprising a fixed base frame 8, the longitudinal section of the fixed base frame 8 is set to be U-shaped, a heat recovery box 20 and a waste gas treatment box 12 are fixed to the bottom wall of the inner cavity of the fixed base frame 8, a partition plate 19 is fixed at the middle position of the inner cavity of the waste gas treatment box 12, the waste gas treatment box 12 and the partition plate 19 are both made of copper plates, a first connecting pipe 11 is fixedly inlaid at the upper end of the partition plate 19, and the longitudinal section of the first connecting pipe 11 is set to be L-shaped.

[0027] Please refer to the attached figure in the instruction manual Figure 1 A second connecting pipe 17 is fixed to the upper end of the outer wall of one side of the exhaust gas treatment box 12, and a third connecting pipe 21 extending to the inner cavity of the exhaust gas treatment box 12 is fixed to the outer wall of one side of the heat recovery box 20. The longitudinal section of the third connecting pipe 21 is set to a spiral shape, and a foldable hose 22 is fixedly connected to the end position of the third connecting pipe 21. The top walls of the exhaust gas treatment box 12 and the heat recovery box 20 are both provided with pluggable soft plugs 18.

[0028] Pull out the soft plug 18 and inject appropriate amounts of clean water, concentrated sodium hydroxide and concentrated sulfuric acid liquids into the inner cavities of the heat recovery box 20 and the exhaust gas treatment box 12 respectively, and connect the foldable hose 22 to the end of the exhaust pipe of the pre-oxidation furnace. At this time, the HCN, NH3 and CO2 generated inside the pre-oxidation furnace can be injected into the inner cavity of the exhaust gas treatment box 12 through the third connecting pipe 21, wherein the concentrated sodium hydroxide solution can react with HCN and CO2 to remove them, and the concentrated sulfuric acid solution can react with NH3 to remove them, thereby treating the exhaust gas generated by the pre-oxidation furnace. When the high-temperature exhaust gas flows through the third connecting pipe 21, the heat inside it can be transferred to the inner cavity of the heat recovery box 20, thereby recovering the heat of the high-temperature flue gas.

[0029] Please refer to the attached figure in the instruction manual Figure 1 A temperature sensor 6 extending to the inner cavity of the heat recovery box 20 is fixed to the bottom of one side of the fixed base frame 8, a first discharge pipe 7 penetrating the fixed base frame 8 is fixed to the bottom wall of the heat recovery box 20, and a control valve is installed on the outer wall of the first discharge pipe 7. The temperature sensor 6 can detect the temperature of the fresh water in the inner cavity of the heat recovery box 20 in real time. When the water temperature is too high, the control valve on the first discharge pipe 7 is opened so that the water can be discharged through the first discharge pipe 7.

[0030] Please refer to the attached figure in the instruction manual Figure 1, PH sensors 9 extending to the inner cavity of the exhaust gas treatment box 12 are installed at both sides of the bottom wall of the fixed base frame 8, and second discharge pipes 10 penetrating the fixed base frame 8 are installed at both sides of the bottom wall of the exhaust gas treatment box 12. A control valve is installed on the outer wall of the second discharge pipe 10, and the second discharge pipe 10 is arranged at the outer side of the PH sensor 9. Under the action of the PH sensor 9, the pH value of the concentrated sodium hydroxide solution and the concentrated sulfuric acid solution in the inner cavity of the exhaust gas treatment box 12 can be detected in real time. When the pH value is insufficient, the control valve on the second discharge pipe 10 is opened, so that the used concentrated sodium hydroxide solution and concentrated sulfuric acid solution are discharged through the second discharge pipe 10 respectively.

[0031] Please refer to the attached figure in the instruction manual Figure 1 A first mounting frame 5 is installed at the lower end position of the outer wall on both sides of the fixed base frame 8, and the two groups of first mounting frames 5 are penetrated by second bolts 4. A threaded component is installed at the upper end position of the outer wall of the exhaust gas treatment box 12 and the heat recovery box 20. The threaded component includes a threaded pipe 1, which is fixed to the upper end position of the outer wall of the exhaust gas treatment box 12 and the heat recovery box 20. A threaded rod 2 that passes through the threaded pipe 1 is threadedly penetrated by the inner cavity of the threaded pipe 1. A handle 16 is fixed at the top wall position of the threaded rod 2. The bottom end of the threaded rod 2 is rotatably connected to the second mounting frame 14 through a bearing. The longitudinal sections of the first mounting frame 5 and the second mounting frame 14 are set to be L-shaped, and the two groups of second mounting frames 14 are penetrated by first bolts 3.

[0032] The height of the movable fixed base frame 8 is adjusted so that the first mounting frame 5 and the second mounting frame 14 on one side can fit together with the vertical mounting surface. The turning handle 16 drives the threaded rod 2 to rotate. Under the action of the threaded tube 1, the threaded rod 2 can move up and down during the rotation. Under the action of the threaded rod 2, the vertical spacing between the first bolt 3 and the second bolt 4 is adjusted. The second bolt 4 and the first bolt 3 are screwed to fix them to the vertical mounting surface, so as to facilitate the fixing of the exhaust gas treatment system in the pre-oxidation furnace on the vertical mounting surface.

[0033] Please refer to the attached figure in the instruction manual Figure 1 The upper ends of the outer walls of both sides of the fixed base frame 8 are provided with slideways 15, and the ends of the two sets of second mounting frames 14 are fixed with sliders 13 slidably connected to the slideways 15. Under the action of the threaded rod 2, the second mounting frames 14 are driven to move synchronously in the inner cavity of the slideway 15 through the sliders 13, so as to facilitate the adjustment of the vertical spacing between the first bolts 3 and the second bolts 4.

[0034] Please refer to the attached figure in the instruction manual Figure 1 and 2 A first transparent liquid level window 23 is installed on the front side wall of the heat recovery box 20. Under the effect of the first transparent liquid level window 23, it is convenient to check the remaining amount of clean water in the inner cavity of the heat recovery box 20 in real time.

[0035] Please refer to the attached figure in the instruction manual Figure 1 and 2 Second transparent liquid level windows 24 are installed on both sides of the front side wall of the exhaust gas treatment box 12. Under the action of the second transparent liquid level window 24, it is convenient to check the residual amount of concentrated sodium hydroxide solution and concentrated sulfuric acid solution in the inner cavity of the exhaust gas treatment box 12 in real time.

[0036] Working principle: When using the waste gas treatment system in the pre-oxidation furnace, first pull out the soft plug 18 and inject appropriate amounts of clean water, concentrated sodium hydroxide and concentrated sulfuric acid liquid into the inner cavities of the heat recovery box 20 and the waste gas treatment box 12 respectively, and connect the foldable hose 22 to the end of the outlet pipe of the pre-oxidation furnace. At this time, the HCN, NH3 and CO2 generated inside the pre-oxidation furnace can be injected into the inner cavity of the waste gas treatment box 12 through the third connecting pipe 21, wherein the concentrated sodium hydroxide solution can react with HCN and CO2 to remove them, and the concentrated sulfuric acid solution can react with NH3 to remove them, thereby treating the waste gas generated by the pre-oxidation furnace. When the high-temperature waste gas flows through the third connecting pipe 21, the heat inside it can be transferred to the inner cavity of the heat recovery box 20, thereby recovering the heat of the high-temperature flue gas.

[0037] With the action of the temperature sensor 6, it is convenient to detect the temperature of the clean water in the inner cavity of the heat recovery box 20 in real time. When the water temperature is too high, the control valve on the first discharge pipe 7 is opened so that the water can be discharged through the first discharge pipe 7. With the action of the first transparent liquid level window 23, it is convenient to check the remaining clean water in the inner cavity of the heat recovery box 20 in real time. With the action of the PH sensor 9, the pH value of the concentrated sodium hydroxide solution and the concentrated sulfuric acid solution in the inner cavity of the exhaust gas treatment box 12 can be detected in real time. When the pH value is insufficient, the control valve on the second discharge pipe 10 is opened so that the used concentrated sodium hydroxide solution and concentrated sulfuric acid solution are discharged through the second discharge pipe 10 respectively. With the action of the second transparent liquid level window 24, it is convenient to check the remaining concentrated sodium hydroxide solution and concentrated sulfuric acid solution in the inner cavity of the exhaust gas treatment box 12 in real time.

[0038] When using the exhaust gas treatment system in the pre-oxidation furnace, first move the height of the fixed base frame 8 so that the first mounting frame 5 and the second mounting frame 14 on one side can fit together with the installation vertical surface, open screw holes that are threadedly connected to the second bolt 4 and the first bolt 3 at appropriate positions on the installation vertical surface, screw the second bolt 4 and the first bolt 3 to fix them to the installation vertical surface, so as to facilitate fixing the exhaust gas treatment system in the pre-oxidation furnace on the installation vertical surface.

[0039] The threaded rod 2 is driven to rotate by turning the handle 16, and the threaded rod 2 can move up and down during the rotation process under the action of the threaded tube 1. The second mounting frame 14 is driven to move synchronously in the inner cavity of the slideway 15 through the slider 13 under the action of the threaded rod 2, so as to facilitate the adjustment of the vertical spacing between the first bolt 3 and the second bolt 4, and facilitate the flexible adjustment of the installation position according to the spacing of the screw holes on the vertical installation surface.

[0040] The standard parts used in the present utility model document can all be purchased from the market. The various components in the present utility model document can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0041] The above are all preferred embodiments of the present utility model, and are not intended to limit the protection scope of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. An exhaust gas treatment system in a pre-oxidation furnace, comprising a fixed base frame (8), characterized in that: A heat recovery box (20) and an exhaust gas treatment box (12) are fixed to the bottom wall of the inner cavity of the fixed base frame (8); a partition plate (19) is fixed at the middle position of the inner cavity of the exhaust gas treatment box (12); a first connecting pipe (11) is fixedly embedded at the upper end of the partition plate (19); a second connecting pipe (17) is fixed to the upper end of an outer wall of one side of the exhaust gas treatment box (12); a third connecting pipe (21) extending into the inner cavity of the exhaust gas treatment box (12) is fixed to the outer wall of one side of the heat recovery box (20); a foldable hose (22) is fixedly connected to the end of the third connecting pipe (21); and pH sensors (9) extending into the inner cavity of the exhaust gas treatment box (12) are installed at both sides of the bottom wall of the fixed base frame (8).

2. The exhaust gas treatment system in the pre-oxidation furnace according to claim 1, characterized in that: A temperature sensor (6) extending into the inner cavity of the heat recovery box (20) is fixed to the bottom of one side of the fixed base frame (8), and a first discharge pipe (7) penetrating the fixed base frame (8) is fixed to the bottom wall of the heat recovery box (20).

3. The exhaust gas treatment system in the pre-oxidation furnace according to claim 1, characterized in that: Second discharge pipes (10) penetrating the fixed base frame (8) are installed on both sides of the bottom wall of the exhaust gas treatment box (12), and pluggable soft plugs (18) are provided on the top walls of the exhaust gas treatment box (12) and the heat recovery box (20).

4. The exhaust gas treatment system in the pre-oxidation furnace according to claim 1, characterized in that: First mounting frames (5) are mounted at the lower ends of the outer walls on both sides of the fixed base frame (8), and second bolts (4) are penetrated through the two groups of the first mounting frames (5). Threaded components are mounted at the upper ends of the outer walls of the exhaust gas treatment box (12) and the heat recovery box (20), and second mounting frames (14) are rotatably connected to the bottoms of the two groups of the threaded components via bearings, and first bolts (3) are penetrated through the two groups of the second mounting frames (14).

5. The exhaust gas treatment system in the pre-oxidation furnace according to claim 4, characterized in that: The threaded assembly comprises a threaded tube (1), the threaded tube (1) being fixed to the upper ends of the outer walls of the exhaust gas treatment box (12) and the heat recovery box (20), a threaded rod (2) passing through the threaded tube (1) being threadedly penetrated through the inner cavity of the threaded tube (1), the bottom end of the threaded rod (2) being rotatably connected to the top wall of the second mounting frame (14) via a bearing, and a handle (16) being fixed to the top wall of the threaded rod (2).

6. The exhaust gas treatment system in the pre-oxidation furnace according to claim 4, characterized in that: Slideways (15) are provided at the upper ends of the outer walls on both sides of the fixed base frame (8), and sliding blocks (13) slidably connected to the slideways (15) are fixed to the ends of the two sets of the second mounting frames (14).

7. The exhaust gas treatment system in the pre-oxidation furnace according to claim 1, characterized in that: A first transparent liquid level window (23) is installed on the front side wall of the heat recovery box (20).

8. The exhaust gas treatment system in the pre-oxidation furnace according to claim 1, characterized in that: Second transparent liquid level windows (24) are installed on both sides of the front side wall of the exhaust gas treatment box (12).

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