Waste gas treatment device for pulp production

Abstract

The utility model discloses a waste gas treatment device for paper pulp production belongs to paper pulp production technical field, including paper pulp cooking bucket and with the waste gas treatment jar of paper pulp cooking bucket top connection, the lateral wall bottom end of waste gas treatment jar is fixed with the storage box, and the multiple spray board of inlaying is arranged in waste gas treatment jar, the conveying mechanism of being connected with the spray board is installed in the storage box, the bottom of multiple spray board all is fixed with atomizing nozzle, and the one side of multiple spray board all is fixed with the atomizing nozzle tube for generating the same direction axial rotating force of fixed mounting, this waste gas treatment device for paper pulp production makes the sodium hydroxide solution in storage box along the conveying pipe and the atomizing nozzle of spray board bottom end and exports, and the atomizing nozzle tube of spray board lateral wall makes sodium hydroxide solution fill the gap of multiple atomizing nozzles, and the rotating atomizing nozzle and the rotating spray of atomizing nozzle tube generation are fully contacted with waste gas and handle, and the treatment effect of paper pulp production waste gas has been improved.

Description

Technical Field

[0001] This utility model belongs to the field of pulp production technology, specifically relating to a waste gas treatment device for pulp production. Background Technology

[0002] Pulp is a fibrous material made from plant fibers through various processing methods. It can be classified according to the processing method into mechanical pulp, chemical pulp, and chemimechanical pulp; it can also be classified according to the fiber raw material used, such as wood pulp, straw pulp, hemp pulp, reed pulp, sugarcane pulp, bamboo pulp, and rag pulp. Pulp is the intermediate raw material obtained in the production of paper or sanitary napkins. Pulp production takes place in a cooking cylinder, where water and pulverized bamboo are mixed and poured into the cylinder. The mixture is then cooked using a jacket within the cylinder. After a period of time, pulp is obtained. The heat source in the jacket is high-temperature steam, which heats the jacket. During the cooking process (sulfate process), pollutants such as H2S, CH3SH (methanethiol), SO2, and TRS (total reduced sulfur) are produced.

[0003] Patent application number 202122591632.8 discloses a waste gas treatment device for pulp production. The lower end of the induced draft box is connected to an air inlet, and the induced draft box is equipped with an induced draft mechanism. The upper end of the induced draft box is connected to an L-shaped air guide pipe, and the end of the L-shaped air guide pipe away from the induced draft box is connected to one side of a filter box. The filter box is equipped with a filtration mechanism, and the end of the filter box away from the L-shaped air guide pipe is connected to a heat exchange box. The end of the heat exchange box away from the filter box is connected to an exhaust port, and the heat exchange box is equipped with a heat exchange mechanism.

[0004] The aforementioned waste gas treatment device for pulp production only uses activated carbon and bamboo charcoal fiber filters to treat the waste gas generated during pulp cooking. However, the filter structure is difficult to fully absorb pulp cooking pollutants such as H2S, CH3SH (methanethiol), SO2, and TRS (total reduced sulfur), and the filter structure is prone to clogging when adsorbing impurities. Furthermore, the embedded filter structure is difficult to disassemble and replace. Utility Model Content

[0005] (1) Technical problems to be solved

[0006] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a waste gas treatment device for pulp production. This waste gas treatment device for pulp production aims to solve the technical problems in the prior art, such as the inability of the filter structure to fully absorb the pollutants from pulp cooking, the easy clogging of the filter structure when adsorbing impurities, and the difficulty in disassembling and replacing the embedded filter structure.

[0007] (2) Technical solution

[0008] To solve the above-mentioned technical problems, this utility model provides a waste gas treatment device for pulp production, including a pulp cooking tank and a waste gas treatment tank connected to the top of the pulp cooking tank. A storage box is fixed to the bottom of the side wall of the waste gas treatment tank, and multiple spray plates are embedded in the waste gas treatment tank. A conveying mechanism connected to the spray plates is installed in the storage box. Atomizing nozzles are fixed to the bottom of each of the multiple spray plates, and atomizing nozzles for generating axial rotational force are fixedly installed on one side of each of the multiple spray plates.

[0009] When using this technical solution, an exhaust gas treatment tank connected to the pulp cooking tank is installed. The exhaust gas generated during pulp production is transported to the exhaust gas treatment tank. A water pump discharges sodium hydroxide solution from the storage tank along the conveying pipe and the atomizing nozzles at the bottom of the spray plate. The atomizing nozzles on the side wall of the spray plate fill the gaps between multiple atomizing nozzles with sodium hydroxide solution. The reaction force generated at the same time causes the rotating pipe at the top of the spray plate to rotate below the conveying pipe. The rotating spray generated by the rotating atomizing nozzles and atomizing nozzles fully contacts and treats the exhaust gas, improving the treatment effect of pulp production exhaust gas. An installation pipe is fixed at the top of the exhaust gas treatment tank. The activated carbon filter in the filter tube at the top of the installation pipe adsorbs the small amount of impurities remaining in the exhaust gas, further treating the harmful substances in the exhaust gas. At the same time, unscrewing the nut at the bottom of the bolt facilitates the disassembly and replacement of the filter tube and the activated carbon filter, improving the convenience of activated carbon filter replacement.

[0010] Preferably, a gas supply pipe is welded and fixed to the top of the side wall of the pulp cooking tank, and a connecting pipe fixed to the gas supply pipe is welded to the side wall of the waste gas treatment tank.

[0011] Furthermore, the conveying mechanism includes a conveying pipe fixed to the top of the storage tank and a water pump located at the bottom of the storage tank and connected to the conveying pipe. Rotating pipes are welded and fixed to the top of the multiple spray plates. A discharge pipe is welded and fixed to the bottom of the side wall of the storage tank. Sodium hydroxide solution is provided in the storage tank. A control valve is installed on the discharge pipe.

[0012] Furthermore, the top end of the conveying pipe extends into the waste gas treatment tank and is rotatably sleeved on the rotating pipe, and a fixed sealed bearing is embedded between the conveying pipe and the rotating pipe.

[0013] Furthermore, an installation pipe is welded and fixed to the top of the exhaust gas treatment tank, and a filter pipe is detachably fixed above the installation pipe.

[0014] Furthermore, the mounting tube and the filter tube are both integrally formed with flanges at their respective ends, and an activated carbon filter is bonded and fixed to the inner wall of the filter tube.

[0015] Furthermore, the top of the flange is equipped with a plurality of bolts arranged in a circular array, and the bottom end of the bolts passes through the flange thread and is fitted with a nut.

[0016] (3) Beneficial effects

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] This invention features a waste gas treatment tank connected to a pulp cooking tank. Waste gas generated during pulp production is transported to the waste gas treatment tank. A water pump discharges sodium hydroxide solution from a storage tank along a conveying pipe and atomizing nozzles at the bottom of a spray plate. Atomizing nozzles on the side wall of the spray plate fill the gaps between multiple atomizing nozzles with sodium hydroxide solution. The resulting reaction force causes a rotating pipe at the top of the spray plate to rotate below the conveying pipe. The rotating spray generated by the rotating atomizing nozzles and atomizing nozzles fully contacts and treats the waste gas, thus improving the treatment effect on pulp production waste gas.

[0019] By fixing an installation pipe to the top of the exhaust gas treatment tank, the activated carbon filter in the filter tube at the top of the installation pipe adsorbs the small amount of impurities remaining in the exhaust gas, further treating the harmful substances in the exhaust gas. At the same time, by unscrewing the nut at the bottom of the bolt, it is easy to disassemble and replace the filter tube and the activated carbon filter, which improves the convenience of replacing the activated carbon filter. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0023] Figure 3 This utility model Figure 2 Enlarged schematic diagram of the structure at point A;

[0024] Figure 4 This utility model Figure 2 Enlarged schematic diagram of the structure at point B.

[0025] The labels in the attached diagram are as follows: 1. Pulp digester; 2. Gas supply pipe; 3. Waste gas treatment tank; 4. Filter pipe; 5. Conveying pipe; 6. Storage tank; 7. Discharge pipe; 8. Spray plate; 9. Water pump; 10. Connecting pipe; 11. Installation pipe; 12. Activated carbon filter; 13. Flange; 14. Bolt; 15. Atomizing spray pipe; 16. Rotating pipe; 17. Atomizing nozzle; 18. Sealed bearing. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] This specific embodiment is a waste gas treatment device for pulp production, and its structural schematic diagram is shown below. Figures 1 to 4 As shown, the device includes a pulp digester 1 and an exhaust gas treatment tank 3 connected to the top of the pulp digester 1. A storage box 6 is fixed to the bottom of the side wall of the exhaust gas treatment tank 3, and multiple spray plates 8 are embedded in the exhaust gas treatment tank 3. A conveying mechanism connected to the spray plates 8 is installed in the storage box 6. Atomizing nozzles 17 are fixed to the bottom of each of the multiple spray plates 8, and atomizing nozzles 15 for generating axial rotational force in the same direction are fixed to one side of each of the multiple spray plates 8. The accessory structure and working method of the pulp digester 1 are existing technologies and will not be described in detail here.

[0028] A gas supply pipe 2 is welded and fixed to the top of the side wall of the pulp digester 1. A connecting pipe 10 fixed to the gas supply pipe 2 is welded to the side wall of the waste gas treatment tank 3. The conveying mechanism includes a conveying pipe 5 fixed to the top of the storage tank 6 and a water pump 9 located at the bottom of the storage tank 6 and connected to the conveying pipe 5. Preferably, it is an ISG50-160A type water pump 9. Rotating pipes 16 are welded and fixed to the top of multiple spray plates 8. A discharge pipe 7 is welded and fixed to the bottom of the side wall of the storage tank 6. Sodium hydroxide solution is provided in the storage tank 6. A control valve is installed on the discharge pipe 7. After the control valve is opened, the pulp waste gas treatment solution is replaced periodically through the discharge pipe 7.

[0029] The top end of the conveying pipe 5 extends into the waste gas treatment tank 3 and is rotatably sleeved on the rotating pipe 16. A fixed sealed bearing 18 is embedded between the conveying pipe 5 and the rotating pipe 16. The conveying pipe 5 is made of rigid material and can support multiple spray plates 8. In order to further improve the support capacity of the spray plates 8, a support rod (not shown in the figure) connected to the conveying pipe 5 is welded on the inner wall of the waste gas treatment tank 3. The water pump 9 discharges the sodium hydroxide solution in the storage tank 6 along the conveying pipe 5 and the atomizing nozzle 17 at the bottom of the spray plate 8. The atomizing nozzle 15 on the side wall of the spray plate 8 fills the gap between multiple atomizing nozzles 17 with sodium hydroxide solution. At the same time, the reaction force generated causes the rotating pipe 16 at the top of the spray plate 8 to rotate below the conveying pipe 5. The rotating spray generated by the rotating atomizing nozzle 17 and the atomizing nozzle 15 fully contacts and treats the waste gas, thereby improving the treatment effect of pulp production waste gas.

[0030] An installation pipe 11 is welded and fixed to the top of the exhaust gas treatment tank 3. A filter pipe 4 is detachably fixed above the installation pipe 11. A flange 13 is integrally formed at the end of the installation pipe 11 and the filter pipe 4. An activated carbon filter 12 is bonded and fixed to the inner wall of the filter pipe 4. Multiple bolts 14 are installed in a ring array at the top of the flange 13. The bottom end of the bolt 14 passes through the flange 13 and is threaded with a nut. The activated carbon filter 12 in the filter pipe 4 at the top of the installation pipe 11 adsorbs the small amount of impurities remaining in the exhaust gas, further treating the harmful substances in the exhaust gas. At the same time, after unscrewing the nut at the bottom of the bolt 14, it is easy to disassemble and replace the filter pipe 4 and the activated carbon filter 12.

[0031] Working Principle: When using the device of this technical solution, the waste gas generated during the pulp production process is transported to the waste gas treatment tank 3. The water pump 9 is started, causing the sodium hydroxide solution in the storage tank 6 to be discharged along the conveying pipe 5 and the atomizing nozzles 17 at the bottom of the spray plate 8. The atomizing nozzles 15 on the side wall of the spray plate 8 fill the gaps between the multiple atomizing nozzles 17 with the sodium hydroxide solution. Simultaneously, the resulting reaction force causes the rotating pipe 16 at the top of the spray plate 8 to rotate below the conveying pipe 5. The rotating spray generated by the rotating atomizing nozzles 17 and the atomizing nozzles 15 fully contacts and treats the waste gas. The treated solution flows along the waste gas treatment tank 3... The gas flows back to storage tank 6 at the bottom. Hydrogen sulfide (H2S) is removed by reacting with NaOH (to produce harmless sulfides); methanethiol (CH3SH) is removed by reacting with NaOH (to produce sodium thiolate), (sodium thiolate can be further oxidized to dimethyl disulfide, reducing odor); sulfur dioxide (SO2) is removed by reacting with NaOH (to produce sodium sulfite), (if air is introduced, sodium sulfite can be oxidized to sodium sulfate). The activated carbon filter 12 in the filter tube 4 at the top of the installation tube 11 adsorbs any remaining impurities in the exhaust gas, further treating the harmful substances in the exhaust gas.

[0032] All technical features in this embodiment can be freely combined according to actual needs.

[0033] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A waste gas treatment device for pulp production, characterized in that, The device includes a pulp cooking tank (1) and a waste gas treatment tank (3) connected to the top of the pulp cooking tank (1). A storage box (6) is fixed to the bottom of the side wall of the waste gas treatment tank (3), and multiple spray plates (8) are embedded in the waste gas treatment tank (3). A conveying mechanism connected to the spray plates (8) is installed in the storage box (6). Atomizing nozzles (17) are fixed to the bottom of the multiple spray plates (8), and atomizing nozzles (15) for generating axial rotational force are fixed to one side of the multiple spray plates (8).

2. The waste gas treatment device for pulp production according to claim 1, characterized in that, The top of the side wall of the pulp cooking tank (1) is welded and fixed with a gas supply pipe (2), and the side wall of the waste gas treatment tank (3) is welded with a connecting pipe (10) fixed to the gas supply pipe (2).

3. The waste gas treatment device for pulp production according to claim 2, characterized in that, The conveying mechanism includes a conveying pipe (5) fixed at the top of the storage tank (6) and a water pump (9) located at the bottom of the storage tank (6) and connected to the conveying pipe (5). Rotating pipes (16) are welded and fixed to the top of the multiple spray plates (8). A discharge pipe (7) is welded and fixed to the bottom of the side wall of the storage tank (6). Sodium hydroxide solution is provided in the storage tank (6). A control valve is installed on the discharge pipe (7).

4. The waste gas treatment device for pulp production according to claim 3, characterized in that, The top end of the conveying pipe (5) extends into the waste gas treatment tank (3) and is rotatably sleeved on the rotating pipe (16), and a fixed sealed bearing (18) is embedded between the conveying pipe (5) and the rotating pipe (16).

5. The waste gas treatment device for pulp production according to claim 1, characterized in that, The top of the waste gas treatment tank (3) is welded and fixed with an installation pipe (11), and a filter pipe (4) is detachably fixed above the installation pipe (11).

6. The waste gas treatment device for pulp production according to claim 5, characterized in that, The mounting tube (11) and the filter tube (4) are both integrally formed with a flange (13) at one end, and an activated carbon filter (12) is bonded and fixed to the inner wall of the filter tube (4).

7. The waste gas treatment device for pulp production according to claim 6, characterized in that, The top of the flange (13) is equipped with a plurality of bolts (14) arranged in a ring array, and the bottom end of the bolts (14) passes through the flange (13) and is threaded with a nut.

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