Ozone pulp bleaching device

Abstract

The utility model provides a device for bleaching slurry by ozone, which comprises a tank body, a stirring device is arranged from the top to the bottom of the tank body in a penetrating manner, the top of the tank body is provided with a feeding device and a tail gas discharge port, and the bottom of the tank body is provided with a discharge port; the tank body is divided into at least one reaction chamber by a reaction chamber bottom plate in the axial direction of the stirring device, the reaction chamber bottom plate with the hollow interior is arranged at the bottom of the reaction chamber, and a gas exhaust port is formed in the reaction chamber bottom plate; an ozone inlet is formed in the outer side wall of the reaction chamber and is communicated with the hollow position of the bottom plate of the reaction chamber. By using the device for bleaching the slurry with the ozone, the slurry can be bleached by fully utilizing the ozone, and the problems of low ozone utilization rate and the like caused by poor uniformity and large heat productivity of the slurry bleached with the ozone can be solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of pulping and papermaking, especially relates to a device for ozone bleaching pulp. BACKGROUND

[0002] With the improvement of environmental protection regulations and the improvement of people's environmental protection consciousness, the traditional bleaching process of pulping and papermaking is paid more and more attention and concern due to pollution problems. Therefore, it is urgent to replace the traditional chlorine-containing bleaching process with a new green bleaching process. In recent years, theoretical research has been more inclined to use chlorine-free bleaching and full chlorine-free bleaching. Chlorine-free bleaching has been widely used in production practice, and full chlorine-free bleaching is currently in the stage of theoretical research. Full chlorine-free bleaching mainly uses oxygen-containing bleaching agent, and no carcinogenic substances are produced in the wastewater of the oxygen-containing bleaching agent. The most important thing is that the pollution load of the waste liquid to the environment is small. As an important oxygen-containing green bleaching agent, ozone has the advantages of high efficiency, environmental protection, fast reaction, wide application, etc., and cannot be underestimated in the development of clean production of pulping and papermaking.

[0003] The application of ozone as a pulp bleaching agent can be traced back to the 1980s. It is mainly used to replace chlorine-containing bleaching agents. Due to the problems of poor selectivity and high production cost, the industrial application has developed slowly. So far, more than 20 pulp mills in the world have applied ozone bleaching to pulp bleaching. At present, there are a large number of studies on ozone bleaching in China, but few people are involved in the research of actual application, including engineering and equipment development, which leads to the fact that ozone bleaching has not been able to realize large-scale industrial application due to equipment problems. At present, although there are paper mills in China that mainly use ozone bleaching, there are still many problems that need to be solved, especially the key equipment.

[0004] CN110409209A discloses a device based on ozone bleaching, which comprises a box body, a center support penetrating the box body, a pulp liquid inlet arranged at the upper end of the box body, and a pulp liquid outlet arranged at the lower end of the box body. The center support is provided with a spiral blade in the middle, and the surface of the spiral blade is embedded with a plurality of grooves for filling activated carbon.

[0005] CN107489052A discloses an ozone bleaching device, which comprises a pulp discharger, a pressure regulating valve, an annular bearing table, a motor I, a center pipe branch, a pulp hanging net film, a liquid level sensor, a constant pressure pump, an infrared moisture meter, a box body, a center pipe, a motor II, a pulp accumulation conical pool and a universal coupling.

[0006] The ozone bleaching device in the above-mentioned scheme has low pulp concentration, which is difficult to meet the requirements of high-concentration ozone bleaching process. On the other hand, the shrinkage and clumping of fibers during the contact of ozone with fibers seriously affect the uniformity of ozone bleaching, and the high temperature generated during the bleaching process can cause ozone degradation, low utilization rate and other problems. Content of the utility model

[0007] In view of the deficiencies of prior art, the utility model discloses a device for ozone bleaching pulp, which can fully utilize ozone to bleach pulp, and solve the problems of poor uniformity of ozone bleaching pulp and low ozone utilization rate caused by large heat output.

[0008] To achieve this purpose, the utility model adopts the following technical solutions:

[0009] The utility model provides a device for ozone bleaching pulp, the device includes jar body, is equipped with stirring device from the top to the bottom of jar body, and the top of jar body is provided with feeding device and tail gas discharge port, and the bottom of jar body is provided with discharge port.

[0010] The jar body is divided into at least one reaction chamber along the axial direction of the stirring device by the reaction chamber bottom plate, the bottom of the reaction chamber is provided with an internally hollow reaction chamber bottom plate, and a gas discharge port is arranged on the reaction chamber bottom plate.

[0011] An ozone inlet is arranged on the outer sidewall of the reaction chamber, and the ozone inlet is in communication with the hollow position of the reaction chamber bottom plate.

[0012] The utility model discloses the jar body is divided into at least one reaction chamber along the axial direction of the stirring device, that is, the reaction chamber inside the jar body, and one reaction chamber bottom plate is arranged in the jar body, so that the whole jar body is a reaction chamber, two reaction chamber bottom plates are arranged in the jar body, so that the jar body is divided into two reaction chambers, and multiple reaction chamber bottom plates are arranged in the jar body, and so on.

[0013] In the device for ozone bleaching pulp, the gas discharge port is arranged on the bottom plate of the reaction chamber, the ozone enters the inside of the bottom plate, is discharged through the small gas passage, and reacts with the pulp under the stirring condition of the stirring device, so that the pulp is fully bleached by using ozone, the tail gas and heat generated by the reaction can be discharged through the tail gas discharge port, and the problems of poor uniformity of ozone bleaching pulp and low ozone utilization rate caused by large heat output are solved.

[0014] In the device for ozone bleaching pulp, the two sides of the reaction chamber bottom plate are provided with gas discharge ports, the viscosity of the pulp is large, the diameter of the gas discharge port is small, and gas is always discharged from the gas discharge port, so the pulp does not flow out of the gas discharge port or block the gas discharge port.

[0015] As a preferred technical scheme of the utility model, the stirring device comprises a stirring shaft and at least one stirring part arranged on the stirring shaft.

[0016] As a preferred technical scheme of the utility model, the stirring part corresponds to the reaction chamber one by one.

[0017] As a preferred technical scheme of the utility model, the stirring part comprises a stirring paddle.

[0018] As a preferred technical scheme of the utility model, the position of the stirring paddle is lower than the slurry liquid level in the reaction chamber.

[0019] As a preferred technical scheme of the utility model, a maintenance window is arranged on the side wall of the reaction chamber.

[0020] The device for ozone bleaching slurry of the utility model has the maintenance window arranged on the side wall, can timely maintain when the device has a fault, and reduces the failure rate of the device.

[0021] As a preferred technical scheme of the utility model, an observation window is arranged on the side wall of the reaction chamber.

[0022] The device for ozone bleaching slurry of the utility model has the observation window arranged on the side wall, can real-time observe the bleaching condition of the slurry through the observation window, and then timely adjusts the flow rate of the ozone.

[0023] As a preferred technical scheme of the utility model, at least two reaction chambers are arranged in the tank body.

[0024] The device for ozone bleaching slurry of the utility model comprises two or more reaction chambers, through the design of the multiple reaction chambers, the slurry quantity is less, heat can be timely dissipated, and the decomposition of ozone is avoided. Each reaction chamber is provided with an observation window and a maintenance window, the multiple observation holes are arranged, the process can be timely adjusted according to different slurry, and the rework caused by the poor bleaching effect is avoided.

[0025] As a preferred technical scheme of the utility model, the discharge port and the discharge port sealing valve are arranged on the reaction chamber bottom plate between the adjacent reaction chambers and away from the ozone inlet port side, and the adjacent reaction chambers are communicated or closed through the discharge port and the discharge port sealing valve.

[0026] In the device for ozone bleaching slurry of the utility model, the adjacent reaction chambers are communicated or closed through the discharge port and the discharge port sealing valve, the process can be adjusted according to the bleaching effect of different slurry, whether the ozone is introduced into the reaction chamber or not, and taking four reaction chambers as an example: if the slurry bleaching is relatively simple, the first, second and third reaction chambers can not introduce ozone, the ozone not reacted in the fourth reaction chamber is absorbed to bleach or the discharge port sealing valve between the first and second reaction chambers is not opened, and only the oxygen is introduced into the first reaction chamber. If the slurry bleaching is difficult, the ozone can be introduced into the ozone inlet port of the first, second and third reaction chambers to carry out the layered reaction.

[0027] As a preferred technical scheme of the utility model, the discharge port sealing valve penetrates one side wall of the tank body.

[0028] As a preferred technical scheme of the utility model, the pore diameter of the gas discharge port is 0.1mm-1mm, for example: 0.1mm, 0.2mm, 0.5mm, 0.8mm or 1mm etc.

[0029] As a preferred technical scheme of the utility model, the density of the gas discharge port is 500 holes / m 2 -5000 holes / m 2 , for example: 500 holes / m 2 , 1000 holes / m 2 , 2000 holes / m 2 , 3000 holes / m 2 Or 5000 holes / m 2 Etc.

[0030] As a preferred technical scheme of the utility model, the device further comprises a PLC control system.

[0031] As a preferred technical scheme of the utility model, the PLC control system is connected outside the reaction chamber through a wire.

[0032] The PLC control system of the utility model is an external system, which can be placed according to actual production conditions, and the system can set the discharge time of each layer of reaction chamber according to different process conditions.

[0033] The numerical range of the utility model not only includes the point values exemplified above, but also includes any point value between the above numerical ranges not exemplified, and the utility model does not enumerate the specific point values included in the range for the sake of brevity and simplicity.

[0034] Compared with the prior art, the utility model has the beneficial effects that:

[0035] The device for ozone bleaching pulp of the utility model can fully utilize ozone to bleach pulp, and can solve the problems of poor uniformity of ozone bleaching pulp and low ozone utilization rate caused by large heat output. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1The utility model provides ozone bleaching pulp's device schematic diagram, 1 is agitating unit, 2 is feeding device, 3 is tail gas discharge port, 4 is jar body, 5 is discharge gate, 6 is first reaction chamber, 7 is first reaction chamber bottom plate, 8 is first ozone inlet, 9 is first maintenance window, 10 is first observation window, 11 is first discharge gate, 12 is first discharge gate seal valve, 13 is second reaction chamber, 14 is second reaction chamber bottom plate, 15 is second ozone inlet, 16 is second maintenance window, 17 is second observation window, 18 is second discharge gate, 19 is second discharge gate seal valve, 20 is third reaction chamber, 21 is third reaction chamber bottom plate, 22 is third ozone inlet, 23 is third maintenance window, 24 is third observation window, 25 is third discharge gate, 26 is third discharge gate seal valve, 27 is fourth reaction chamber, 28 is fourth reaction chamber bottom plate, 29 is fourth ozone inlet, 30 is fourth maintenance window, 31 is fourth observation window.

[0037] Figure 2 The utility model provides ozone bleaching pulp's device first reaction chamber bottom plate's structure schematic diagram, 8 is first ozone inlet, 11 is first discharge gate, 32 is agitating fixed sealing device, 33 is stirring shaft installation, 34 is gas exhaust port. Specific implementation

[0038] It needs to be understood that, in the description of the utility model, the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model in indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more features. In the description of the utility model, unless otherwise specified, the meaning of "multiple" is two or more.

[0039] It needs to be explained that, in the description of the utility model, unless otherwise explicitly specified and limited, the terms "arrangement", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood through specific circumstances.

[0040] The technical scheme of the utility model is further illustrated below in combination with the drawings and by specific embodiments.

[0041] In one specific embodiment, the utility model provides an ozone bleaching pulp device, a structural schematic diagram of the ozone bleaching pulp device is shown as Figure 1 The device comprises a tank body 4, a stirring device 1 is arranged from top to bottom in the tank body 4, a feeding device 2 and a tail gas discharge port 3 are arranged at the top of the tank body 4, and a discharge port 5 is arranged at the bottom of the tank body 4.

[0042] The tank body 4 is divided into a first reaction chamber 6, a second reaction chamber 13, a third reaction chamber 20 and a fourth reaction chamber 27 along the axial direction of the stirring device 1 by a first reaction chamber bottom plate 7, a second reaction chamber bottom plate 14 and a third reaction chamber bottom plate 21, the first reaction chamber bottom plate 7, the second reaction chamber bottom plate 14 and the third reaction chamber bottom plate 21 are completely the same in structure, and the fourth reaction chamber bottom plate 28 is different from the first reaction chamber bottom plate 7 only in that no discharge port is arranged, and the first reaction chamber bottom plate 7 is taken as an example:

[0043] The structural schematic diagram of the first reaction chamber bottom plate 7 is shown as Figure 2 The first reaction chamber bottom plate 7 is connected with a first ozone inlet 8 on the side wall of the first reaction chamber 6, a first discharge port 11 is arranged at one side edge of the first reaction chamber bottom plate 7, a stirring shaft mounting port 33 is arranged at the center of the first reaction chamber bottom plate 7 for inserting a stirring shaft, stirring fixed sealing devices 32 are arranged around the stirring shaft mounting port 33, and a gas discharge port 34 is arranged on the surface of the first reaction chamber bottom plate 7.

[0044] The bottom of the first reaction chamber 6, the second reaction chamber 13, the third reaction chamber 20 and the fourth reaction chamber 27 is provided with the first reaction chamber bottom plate 7, the second reaction chamber bottom plate 14, the third reaction chamber bottom plate 21 and the fourth reaction chamber bottom plate 28 which are hollow inside, and the first reaction chamber bottom plate 7, the second reaction chamber bottom plate 14, the third reaction chamber bottom plate 21 and the fourth reaction chamber bottom plate 28 are provided with gas discharge ports.

[0045] First ozone inlets 8, second ozone inlets 15, third ozone inlets 22 and fourth ozone inlets 29 are arranged on the outer side walls of the first reaction chamber 6, the second reaction chamber 13, the third reaction chamber 20 and the fourth reaction chamber 27, and the first ozone inlets 8, the second ozone inlets 15, the third ozone inlets 22 and the fourth ozone inlets 29 are respectively communicated with the hollow positions of the first reaction chamber bottom plate 7, the second reaction chamber bottom plate 14, the third reaction chamber bottom plate 21 and the fourth reaction chamber bottom plate 28.

[0046] The utility model discloses an ozone bleaching pulp's device, set up gas exhaust port on the bottom plate of reaction chamber, and ozone enters the inside of bottom plate, and the reaction of pulp is generated under the stirring condition of stirring device, and the sufficient bleaching of pulp is carried out to ozone, and the tail gas and heat of reaction can be discharged through tail gas exhaust port, and the problem such as low ozone utilization rate caused by poor uniformity of ozone bleaching pulp and large heat output is solved.

[0047] The utility model discloses an ozone bleaching pulp's device, the both sides of reaction chamber bottom plate all are provided with gas exhaust port, because the viscosity of pulp is all bigger, and the diameter of gas exhaust port is smaller, and gas exhaust port is always discharged gas, therefore, pulp will not flow from gas exhaust port or block gas exhaust port.

[0048] Further, the stirring device 1 includes a stirring shaft and four stirring portions provided on the stirring shaft, the stirring portions are respectively provided in the first reaction chamber 6, the second reaction chamber 13, the third reaction chamber 20 and the fourth reaction chamber 27, and the stirring portions each independently include a stirring rod and a stirring paddle.

[0049] Further, after liquid injection, the position of the stirring paddle is lower than the pulp liquid level in the first reaction chamber 6, the second reaction chamber 13, the third reaction chamber 20 and the fourth reaction chamber 27.

[0050] Further, the first maintenance window 9, the second maintenance window 16, the third maintenance window 23 and the fourth maintenance window 30 are respectively provided on the side walls of the first reaction chamber 6, the second reaction chamber 13, the third reaction chamber 20 and the fourth reaction chamber 27.

[0051] The utility model discloses an ozone bleaching pulp's device, and the maintenance window is provided on the side wall, so that timely maintenance can be carried out when the device fails, and the failure rate of the device is reduced.

[0052] Further, the first observation window 10, the second observation window 17, the third observation window 24 and the fourth observation window 31 are respectively provided on the side walls of the first reaction chamber 6, the second reaction chamber 13, the third reaction chamber 20 and the fourth reaction chamber 27.

[0053] The utility model discloses an ozone bleaching pulp's device, and the observation window is provided on the side wall, so that the bleaching condition of the pulp can be observed in real time through the observation window, and the flow rate of ozone can be timely adjusted.

[0054] Further, at least two reaction chambers are provided in the tank body.

[0055] The device for ozone bleaching pulp comprises two or more reaction chambers, through the design of multiple reaction chambers, the amount of pulp accumulation is small, heat can be timely dissipated, and the decomposition of ozone is avoided.

[0056] Further, a first discharge port 11 and a first discharge port sealing valve 12 are arranged on the first reaction chamber bottom plate 7 away from the first ozone inlet 8 side between the first reaction chamber 6 and the second reaction chamber 13, and the first reaction chamber 6 and the second reaction chamber 13 are communicated or closed through the first discharge port 11 and the first discharge port sealing valve 12.

[0057] Further, a second discharge port 18 and a second discharge port sealing valve 19 are arranged on the second reaction chamber bottom plate 14 away from the second ozone inlet 15 side between the second reaction chamber 13 and the third reaction chamber 20, and the second reaction chamber 13 and the third reaction chamber 20 are communicated or closed through the second discharge port 18 and the second discharge port sealing valve 19.

[0058] Further, a third discharge port 25 and a third discharge port sealing valve 26 are arranged on the third reaction chamber bottom plate 21 away from the third ozone inlet 22 side between the third reaction chamber 20 and the fourth reaction chamber 27, and the third reaction chamber 20 and the fourth reaction chamber 27 are communicated or closed through the third discharge port 25 and the third discharge port sealing valve 26.

[0059] In the device for ozone bleaching pulp, adjacent reaction chambers are communicated or closed through the discharge port and the discharge port sealing valve, the process can be adjusted according to the bleaching effect of different pulp, and whether ozone is introduced into the reaction chamber, for example, four reaction chambers: if the pulp bleaching is relatively simple, the first, second and third reaction chambers can not be introduced into ozone, the ozone not reacted in the fourth reaction chamber is absorbed to bleach or the discharge port sealing valve between the first and second reaction chambers is not opened, and only oxygen is introduced into the first reaction chamber. If the pulp bleaching is difficult, the ozone can be introduced into the ozone inlet of the first, second and third reaction chambers to carry out layered reaction.

[0060] Further, the first discharge port sealing valve 12, the second discharge port sealing valve 19 and the third discharge port sealing valve 26 penetrate one side of the sidewall of the tank body.

[0061] Further, the pore diameter of the gas discharge port is 0.1mm-1mm, for example, 0.1mm, 0.2mm, 0.5mm, 0.8mm or 1mm.

[0062] Further, the density of the gas discharge port is 500 holes / m 2 -5000 holes / m 2 , for example, 500 holes / m 2, 1000 holes / m 2 , 2000 holes / m 2 , 3000 holes / m 2 or 5000 holes / m 2 and the like.

[0063] Further, the device further comprises a PLC control system.

[0064] Further, the PLC control system is connected to the outside of the reaction chamber through a wire.

[0065] The PLC control system is an external system, which can be placed according to actual production conditions, and the system can set the discharge time of each layer of the reaction chamber according to different process conditions.

[0066] Embodiment 1

[0067] The embodiment provides a device for ozone bleaching pulp, which comprises a tank body 4, a stirring device 1 penetrating from top to bottom of the tank body 4, a feeding device 2 and a tail gas discharge port 3 arranged at the top of the tank body 4, and a discharge port 5 arranged at the bottom of the tank body 4.

[0068] The inside of the tank body 4 is provided with a first reaction chamber 6, a second reaction chamber 13, a third reaction chamber 20 and a fourth reaction chamber 27, the bottom of the first reaction chamber 6, the second reaction chamber 13, the third reaction chamber 20 and the fourth reaction chamber 27 is provided with a first reaction chamber bottom plate 7, a second reaction chamber bottom plate 14, a third reaction chamber bottom plate 21 and a fourth reaction chamber bottom plate 28 which are hollow, a gas discharge port with a pore size of 0.5mm and a density of 5000 holes / m 2 is arranged on the first reaction chamber bottom plate 7, the second reaction chamber bottom plate 14, the third reaction chamber bottom plate 21 and the fourth reaction chamber bottom plate 28.

[0069] The first reaction chamber bottom plate 7, the second reaction chamber bottom plate 14 and the third reaction chamber bottom plate 21 are completely same in structure, and the fourth reaction chamber bottom plate 28 is different from the first reaction chamber bottom plate 7 only in that no discharge port 11 is arranged, and the first reaction chamber bottom plate 7 is taken as an example.

[0070] The structural diagram of the first reaction chamber bottom plate 7 is shown in Figure 2 The first reaction chamber bottom plate 7 is connected with a first ozone gas inlet 8 on the side wall of the first reaction chamber 6, a first discharge port 11 is arranged on one side edge of the first reaction chamber bottom plate 7, a stirring shaft mounting port 33 is arranged at the center of the first reaction chamber bottom plate 7 for inserting a stirring shaft, a stirring fixed sealing device 32 is arranged around the stirring shaft mounting port 33, and a gas discharge port 34 is arranged on the surface of the first reaction chamber bottom plate 7.

[0071] The first ozone inlet 8, the second ozone inlet 15, the third ozone inlet 22 and the fourth ozone inlet 29 are arranged on the outer side wall of the first reaction chamber 6, the second reaction chamber 13, the third reaction chamber 20 and the fourth reaction chamber 27 respectively, and are communicated with the hollow positions of the first reaction chamber bottom plate 7, the second reaction chamber bottom plate 14, the third reaction chamber bottom plate 21 and the fourth reaction chamber bottom plate 28 respectively.

[0072] The stirring device 1 comprises a stirring shaft and four stirring parts arranged on the stirring shaft, which are arranged in the first reaction chamber 6, the second reaction chamber 13, the third reaction chamber 20 and the fourth reaction chamber 27 respectively, and each of the stirring parts independently comprises a stirring rod and a stirring paddle.

[0073] The position of the stirring paddle is lower than the slurry liquid level in the first reaction chamber 6, the second reaction chamber 13, the third reaction chamber 20 and the fourth reaction chamber 27.

[0074] The first maintenance window 9, the second maintenance window 16, the third maintenance window 23 and the fourth maintenance window 30 are arranged on the side wall of the first reaction chamber 6, the second reaction chamber 13, the third reaction chamber 20 and the fourth reaction chamber 27 respectively.

[0075] The first observation window 10, the second observation window 17, the third observation window 24 and the fourth observation window 31 are arranged on the side wall of the first reaction chamber 6, the second reaction chamber 13, the third reaction chamber 20 and the fourth reaction chamber 27 respectively.

[0076] The first discharge port 11 and the first discharge port sealing valve 12 are arranged on the first reaction chamber bottom plate 7 between the first reaction chamber 6 and the second reaction chamber 13, away from the first ozone inlet 8 side, and the first reaction chamber 6 and the second reaction chamber 13 are communicated or closed through the first discharge port 11 and the first discharge port sealing valve 12;

[0077] The second discharge port 18 and the second discharge port sealing valve 19 are arranged on the second reaction chamber bottom plate 14 between the second reaction chamber 13 and the third reaction chamber 20, away from the second ozone inlet 15 side, and the second reaction chamber 13 and the third reaction chamber 20 are communicated or closed through the second discharge port 18 and the second discharge port sealing valve 19;

[0078] The third discharge port 25 and the third discharge port sealing valve 26 are arranged on the third reaction chamber bottom plate 21 between the third reaction chamber 20 and the fourth reaction chamber 27, away from the third ozone inlet 22 side, and the third reaction chamber 20 and the fourth reaction chamber 27 are communicated or closed through the third discharge port 25 and the third discharge port sealing valve 26.

[0079] The first discharge port sealing valve 12, the second discharge port sealing valve 19 and the third discharge port sealing valve 26 penetrate a side wall of the tank body.

[0080] The device further comprises a PLC control system which is external to the system and can be placed according to actual production conditions, and the system can set the discharge time of each layer of reaction chambers according to different process conditions.

[0081] The pulp obtained by bleaching by using the device has a whiteness ISO% of 80-90% after washing.

[0082] The applicant declares that the above description is only a specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, and the skilled person in the art should understand that any change or replacement within the technical range disclosed by the utility model can be easily thought of by any person skilled in the art, and falls within the protection scope and disclosure range of the utility model.

Claims

1. An ozone bleaching device for pulp, characterized in that: The device comprises a tank body, a stirring device is provided from the top to the bottom of the tank body, a feeding device and an exhaust gas discharge port are provided at the top of the tank body, and a discharge port is provided at the bottom of the tank body; The tank body is divided into at least one reaction chamber by a reaction chamber bottom plate along the axial direction of the stirring device, the bottom of the reaction chamber is provided with a hollow reaction chamber bottom plate, and the reaction chamber bottom plate is provided with a gas exhaust port; An ozone inlet is provided on the outer side wall of the reaction chamber, and the ozone inlet is communicated with the hollow position of the bottom plate of the reaction chamber.

2. The device according to claim 1, characterized in that The stirring device includes a stirring shaft and at least one stirring portion provided on the stirring shaft; The stirring part corresponds to the reaction chamber one by one; The stirring portion includes a stirring paddle.

3. The device according to claim 1, characterized in that A maintenance window is provided on the side wall of the reaction chamber.

4. The device according to claim 1, characterized in that An observation window is provided on the side wall of the reaction chamber.

5. The device according to claim 1 or 2, characterized in that At least two reaction chambers are arranged inside the tank.

6. The device according to claim 5, characterized in that A discharge port and a discharge port sealing valve are provided on the side of the reaction chamber bottom plate between adjacent reaction chambers away from the ozone inlet, and the adjacent reaction chambers are connected or closed through the discharge port and the discharge port sealing valve.

7. The device according to claim 6, characterized in that The discharge port sealing valve passes through a side wall of the tank body.

8. The device according to claim 1, characterized in that The aperture of the gas outlet is 0.1 mm to 1 mm; The density of the gas outlet is 500 holes / m 2 ~5000 holes / m 2 .

9. The device according to claim 1, characterized in that The device also includes a PLC control system.

10. The device according to claim 9, characterized in that The PLC control system is connected to the outside of the reaction chamber through a wire.

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