Device for bleaching paper pulp

Abstract

The utility model discloses a device for bleaching paper pulp, which comprises an oxygen supply component, an ozone generator, an ozone gas-water mixing tank, a gas-liquid mixing pump, an ozone paper pulp bleaching device and an ozone tail gas destructor, the gas inlet end of the gas-liquid mixing pump is connected with the ozone generator, the liquid inlet end of the gas-liquid mixing pump is connected with a liquid outlet, and the outlet end of the gas-liquid mixing pump is connected with a gas-water flow inlet; a water inlet and an air inlet are formed in the bottom of the ozone paper pulp bleaching device, a second air outlet is formed in the top of the ozone paper pulp bleaching device, the water inlet is connected with the liquid outlet through a third pipeline, and the air inlet is connected with the air outlet end of the ozone generator through a fourth pipeline; and the ozone tail gas destructor is used for decomposing unreacted ozone gas from the ozone gas-water mixing tank and the ozone paper pulp bleaching device. Ozone and water are mixed by a gas-liquid mixing pump and are introduced into an ozone gas-water mixing tank, so that the dissolution of ozone gas in water is increased; a gas-water mixture enters the ozone paper pulp bleaching device and can be in full contact with paper pulp, so that the bleaching effect is good.

Description

Technical Field

[0001] The utility model belongs to the technical field of pulp treatment devices, and particularly relates to a device for pulp bleaching. Background Art

[0002] With the improvement of people's environmental protection awareness, the pollution caused by traditional pulp and paper bleaching processes has attracted more and more widespread attention and emphasis in society. The traditional bleaching processes mainly include hypochlorite bleaching and hydrogen peroxide bleaching. However, hypochlorite bleaching and hydrogen peroxide bleaching consume a huge amount of water, require a large amount of chemical agents, and have energy consumption requirements such as external heating. The storage, transportation, and use of chemical agents will cause environmental pollution and harm to people's health. In view of this, how to design a pulp bleaching technology that can reduce environmental pollution is the technical problem to be solved by the present utility model. Content of the Utility Model

[0003] The utility model provides a device for pulp bleaching, which realizes pulp bleaching with reduced environmental pollution.

[0004] To achieve the above technical purpose, the present utility model is realized by adopting the following technical solutions:

[0005] In one aspect, the present utility model provides a device for pulp bleaching, including:

[0006] An oxygen supply component, which is provided with an oxygen discharge port;

[0007] An ozone generator for generating ozone gas;

[0008] An ozone-water mixing tank, which is formed with a gas-water inlet, a liquid discharge port at the bottom, and a first exhaust port at the top;

[0009] A gas-liquid mixing pump, whose air inlet end is connected to the air outlet end of the ozone generator through a first pipeline, whose liquid inlet end is connected to the liquid discharge port through a second pipeline, and whose outlet end is connected to the gas-water inlet;

[0010] An ozone pulp bleacher, which has a water inlet and an air inlet at the bottom, a second exhaust port at the top, the water inlet is connected to the liquid discharge port through a third pipeline, and the air inlet is connected to the air outlet end of the ozone generator through a fourth pipeline;

[0011] An ozone tail gas destroyer, the first exhaust port and the second exhaust port are both connected to the ozone tail gas destroyer through pipelines, and the ozone tail gas destroyer is configured to decompose and process the unreacted ozone gas from the ozone-water mixing tank and the ozone pulp bleacher.

[0012] In some embodiments of the present application, the device for pulp bleaching further includes:

[0013] An ozone storage tank, which is arranged on the fourth pipeline and is configured to store ozone gas and supply ozone gas to the ozone pulp bleacher;

[0014] An ozone booster, which is arranged on the fourth pipeline and is located on the side of the ozone storage tank away from the ozone pulp bleacher, and is configured to boost the ozone gas flowing into the fourth pipeline.

[0015] In some embodiments of the present application, the device for pulp bleaching further includes:

[0016] An ozone high-voltage power cabinet, which is configured to provide high-frequency high-voltage electric energy for the ozone generator;

[0017] A cooling component, which is configured to cool down the ozone generator, the ozone high-voltage power cabinet and the ozone booster.

[0018] In some embodiments of the present application, the cooling component includes:

[0019] A water chiller;

[0020] A cold water pump;

[0021] The water inlet end of the cold water pump is connected to the water outlet end of the water chiller through a fifth pipeline, and the water outlet end of the cold water pump is respectively connected to the water inlet end of the ozone generator, the water inlet end of the ozone high-voltage power cabinet and the water inlet end of the ozone booster through a sixth pipeline, a seventh pipeline and an eighth pipeline; the water outlet ends of the ozone generator, the ozone high-voltage power cabinet and the ozone booster are respectively connected to the water inlet end of the water chiller through pipelines.

[0022] In some embodiments of the present application, a first flowmeter, a first valve, a first anti-backflow tank and a first check valve are arranged on the first pipeline, and the first check valve is located between the first anti-backflow tank and the gas-liquid mixing pump;

[0023] A second valve and a second check valve are arranged on the second pipeline.

[0024] In some embodiments of the present application, the device for pulp bleaching further includes:

[0025] An ozone water pump, which is arranged on the third pipeline;

[0026] Wherein, a third valve, a third check valve and a second flowmeter are arranged on the third pipeline.

[0027] In some embodiments of the present application, a third flowmeter, a fourth valve, a second anti-backflow tank, and a fourth check valve are provided on the fourth pipeline. The second anti-backflow tank is located between the ozone storage tank and the ozone pulp bleacher, and the fourth check valve is located between the second anti-backflow tank and the ozone pulp bleacher.

[0028] In some embodiments of the present application, the oxygen supply assembly includes:

[0029] An air compressor, a first air storage tank, a refrigerated dryer, a second air storage tank, and an oxygen generator that are connected in sequence;

[0030] Wherein, an oil-water separator is provided between the first air storage tank and the refrigerated dryer; an air dust filter is connected to the air outlet end of the oxygen generator, and the oxygen discharge port is connected to the air outlet end of the air dust filter.

[0031] In some embodiments of the present application, a water distribution pipe is provided in the ozone-water mixing tank, and a plurality of water distribution nozzles are arranged at intervals on the water distribution pipe.

[0032] In some embodiments of the present application, the ozone pulp bleacher includes:

[0033] A tank body, in which a containing cavity is formed;

[0034] An ozone aeration pipe, which is arranged at the bottom of the containing cavity and is communicated with the air inlet;

[0035] A stirrer, which is arranged on the tank body and is located above the ozone aeration pipe, and is configured to stir the pulp in the containing cavity.

[0036] Compared with the prior art, the advantages and positive effects of the present utility model are: by providing an oxygen supply assembly, an ozone generator, an ozone-water mixing tank, a gas-liquid mixing pump, an ozone pulp bleacher, and an ozone tail gas destroyer, the oxygen supply assembly is used to provide oxygen for the ozone generator, the ozone generator is used to generate ozone gas, the gas-liquid mixing pump mixes the ozone gas generated by the ozone generator and the water in the ozone-water mixing tank to form a gas-water mixture, and the gas-water mixture is introduced into the ozone-water mixing tank to increase the dissolution of ozone gas in water; the gas-water mixture enters the ozone pulp bleacher through the third pipeline and can be in full contact with the pulp. Ozone has strong oxidizing property and can effectively destroy pigment molecules, and the bleaching effect is good; ozone molecules do not produce toxic substances during the bleaching process, do not pollute the environment, ozone will not remain in the substance during the bleaching process, and will not affect the subsequent processing, thereby reducing costs; the tops of the ozone-water mixing tank and the ozone pulp bleacher are respectively connected to the ozone tail gas destroyer through pipelines to decompose the unreacted ozone gas and reduce environmental pollution. Description of the Drawings

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0038] Figure 1 Structural schematic diagram of an embodiment of the device for pulp bleaching provided by the present invention;

[0039] Figure 2 Cross-sectional view of an embodiment of the ozone-water mixing tank provided by the present invention;

[0040] Figure 3 Structural schematic diagram of an embodiment of the ozone pulp bleacher provided by the present invention.

[0041] Explanation of reference numerals:

[0042] 1. Oxygen supply component; 11. Air compressor; 12. First air storage tank; 13. Refrigerated dryer; 14. Second air storage tank; 15. Oxygen generator; 16. Oil-water separator; 17. Dust removal filter; 171. Low-grade precision filter; 172. High-grade precision filter;

[0043] 2. Ozone generator;

[0044] 3. Ozone-water mixing tank; 31. Gas-water inlet; 32. Drain port; 33. First exhaust port; 34. Water distribution pipe; 35. Water distribution nozzle;

[0045] 4. Gas-liquid mixing pump; 40. Pulp process tail water tank; 41. First pipeline; 411. First flowmeter; 412. First valve; 413. First anti-backflow tank; 414. First check valve; 42. Second pipeline; 421. Second valve; 422. Second check valve; 43. Third pipeline; 431. Ozone water pump; 432. Third valve; 433. Third check valve; 434. Second flowmeter; 44. Fourth pipeline; 441. Ozone storage tank; 442. Ozone booster; 443. Third flowmeter; 444. Fourth valve; 445. Second anti-backflow tank; 446. Fourth check valve; 45. Fifth pipeline; 46. Sixth pipeline; 47. Seventh pipeline; 48. Eighth pipeline; 49. Oxygen supply pipeline;

[0046] 5. Ozone pulp bleacher; 51. Water inlet; 52. Air inlet; 53. Second exhaust port; 54. Tank body; 541. Accommodation cavity; 55. Ozone aeration pipe; 56. Agitator; 57. Feed port;

[0047] 6. Ozone tail gas destructor; 61. Discharge pipe;

[0048] 7. Ozone high - voltage power supply cabinet;

[0049] 8. Cooling component; 81. Water chiller; 82. Cold water pump. Detailed implementation manners

[0050] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0051] It should be noted that in the description of the present utility model, the terms indicating directions or positional relationships such as "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0052] In the present utility model, unless otherwise clearly defined and limited, the terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0053] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0054] The following disclosure provides many different embodiments or examples for implementing different structures of the present utility model. To simplify the disclosure of the present utility model, components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present utility model. In addition, the present utility model may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present utility model provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0055] Ozone has very strong oxidation characteristics. It can not only quickly kill harmful pathogens such as bacteria, fungi, mycoplasma, and even viruses, but also produce no secondary pollution during the disinfection and sterilization process. It is widely used in industrial sewage treatment, tap water disinfection, food processing, textile, paper-making and other fields.

[0056] The reaction of ozone with dyes in pulp is a key step in ozone bleaching. Ozone is a strong oxidant that can combine with unstable molecules of dyes in pulp and destroy their chemical structure, causing them to lose color. The charged oxygen atom (O) in the ozone molecule can combine with the double bond (C = C) in the dye molecule to form an ozone addition product. This process will cause a change in the structure of the dye molecule, making it unable to absorb visible light, and thus achieving the bleaching effect. In this process, conditions such as reaction temperature, ozone concentration, and reaction time generally need to be controlled to achieve the best bleaching effect.

[0057] In one aspect, in combination with Figures 1 to 3 As shown, an embodiment of the present disclosure provides a device for pulp bleaching. The device includes an oxygen supply component 1, an ozone generator 2, an ozone-water mixing tank 3, a gas-liquid mixing pump 4, an ozone-pulp bleacher 5, and an ozone tail gas destructor 6.

[0058] An oxygen discharge port (not shown in the figure) is provided on the oxygen supply component 1, and the oxygen supply component 1 supplies oxygen to the ozone generator 2 through the oxygen discharge port.

[0059] The ozone generator 2 generates ozone gas by high-voltage discharge of oxygen.

[0060] Specifically, the oxygen discharge port is connected to the intake end of the ozone generator 2 through an oxygen supply pipe 49. Components such as an oxygen supply valve, a pressure reducing and stabilizing valve, a pressure detector, a maintenance valve, an electric regulating valve, and a safety valve are sequentially arranged on the oxygen supply pipe 49 to control the supply of oxygen.

[0061] An air-water inlet 31 is formed on the ozone air-water mixing tank 3. A liquid discharge port 32 and a sewage discharge valve are formed at the bottom of the ozone air-water mixing tank 3. The liquid discharge port 32 is used to discharge the mixture formed by ozone and water, and the sewage discharge valve is used to discharge waste water or dirt to avoid blockage. A first exhaust port 33 is formed at the top of the ozone air-water mixing tank 3.

[0062] In order to facilitate the real-time detection of the dissolution concentration of ozone in water in the ozone air-water mixing tank 3, a maintenance valve and an ozone water dissolution concentration sampler are also provided on the ozone air-water mixing tank 3. Generally, the required value of the ozone water dissolution concentration is 1-30 ppm.

[0063] The air inlet end of the gas-liquid mixing pump 4 is connected to the air outlet end of the ozone generator 2 through a first pipeline 41. The liquid inlet end of the gas-liquid mixing pump 4 is connected to the liquid discharge port 32 through a second pipeline 42. The outlet end of the gas-liquid mixing pump 4 is connected to the air-water inlet 31.

[0064] Combined Figure 1 As shown, in some embodiments, a pulp process tail water tank 40 is further included. The pulp process tail water tank 40 is used to store the tail water recovered from the subsequent processes of the pulp. The pulp process tail water tank 40 is communicated with the liquid inlet end of the gas-liquid mixing pump 4 through a pipeline, so that the tail water generated in the subsequent processes of the pulp can be recycled, reducing the consumption of water resources and being beneficial to cost reduction.

[0065] Stainless steel bellows expansion joints are provided at both the liquid inlet end and the outlet end of the gas-liquid mixing pump 4. The liquid inlet end of the gas-liquid mixing pump 4 takes water from the ozone air-water mixing tank 3 through the stainless steel bellows expansion joint. After mixing the water with high-concentration ozone gas, it enters the ozone air-water mixing tank 3 through the stainless steel bellows expansion joint at the outlet end for uniform reaction.

[0066] An inlet 51 and an air inlet 52 are formed at the bottom of the ozone pulp bleacher 5. A second exhaust port 53 is formed at the top of the ozone pulp bleacher 5. The inlet 51 is connected to the liquid discharge port 32 through a third pipeline 43. In this way, the ozone water flowing out from the ozone air-water mixing tank 3 can enter the ozone pulp bleacher 5 to react with the pulp. The air inlet 52 is connected to the air outlet end of the ozone generator 2 through a fourth pipeline 44. The ozone generator 2 provides ozone gas for the ozone pulp bleacher 5 through the fourth pipeline 44.

[0067] The air inlet 52 is located at the bottom of the ozone pulp bleacher 5, which is convenient for the ozone gas to dissolve in the pulp in the ozone pulp bleacher 5 to carry out the bleaching reaction on the pulp.

[0068] Both the first exhaust port 33 and the second exhaust port 53 are connected to the ozone tail gas destructor 6 through pipelines. The ozone tail gas destructor 6 is configured to decompose and treat the unreacted ozone gas from the ozone air-water mixing tank 3 and the ozone pulp bleacher 5 to avoid air pollution.

[0069] Specifically, the oxygen supply component 1 is used to supply oxygen to the ozone generator 2. The ozone generator 2 is used to generate ozone gas. The gas-liquid mixing pump 4 mixes the ozone gas generated by the ozone generator 2 and the water in the ozone-water mixing tank 3 to form a gas-water mixture, and then feeds the gas-water mixture into the ozone-water mixing tank 3 to increase the dissolution of ozone gas in water. The gas-water mixture enters the ozone pulp bleacher 5 through the third pipeline 43, and can fully contact with the pulp. Ozone has strong oxidizing property and can effectively destroy pigment molecules, with good bleaching effect. Ozone molecules will not produce toxic substances during the bleaching process, causing no pollution to the environment. Ozone will not remain in the substance during the bleaching process and will not affect subsequent processing, thus reducing costs. The tops of the ozone-water mixing tank 3 and the ozone pulp bleacher 5 are respectively connected to the ozone tail gas destroyer 6 through pipelines to decompose the unreacted ozone gas and reduce environmental pollution.

[0070] In some embodiments of the present application, an exhaust pipe 61 is provided on the ozone tail gas destroyer 6. An inspection valve and a tail gas concentration detector are provided on the exhaust pipe 61. The tail gas concentration detector is used to detect the concentration of ozone gas in the exhaust pipe 61. When the concentration of ozone gas in the exhaust pipe 61 meets the standard, it can be discharged outdoors.

[0071] In some embodiments of the present application, the device for pulp bleaching further includes an ozone gas storage tank 441 and an ozone booster 442.

[0072] The ozone gas storage tank 441 is arranged on the fourth pipeline 44. The ozone gas storage tank 441 is configured to store ozone gas and supply ozone gas to the ozone pulp bleacher 5.

[0073] The ozone booster 442 is arranged on the fourth pipeline 44 and is located on the side of the ozone gas storage tank 441 away from the ozone pulp bleacher 5. The ozone booster 442 is configured to boost the ozone gas flowing into the fourth pipeline 44, and the boosted ozone gas enters the ozone gas storage tank 441 for storage.

[0074] Specifically, the ozone booster 442 can improve the output accuracy and usability of ozone.

[0075] In addition, pipelines are connected in parallel on both sides of the ozone booster 442, and control valves are provided on the pipelines. The ozone gas in the fourth pipeline 44 can directly enter the ozone gas storage tank 441 for storage without passing through the ozone booster 442.

[0076] In some embodiments of the present application, the device for pulp bleaching further includes an ozone high-voltage power cabinet 7 and a cooling component 8.

[0077] The ozone high-voltage power supply cabinet 7 is configured to provide high-frequency high-voltage electrical energy for the ozone generator 2.

[0078] The cooling assembly 8 is configured to cool down the ozone generator 2, the ozone high-voltage power supply cabinet 7, and the ozone booster 442. This is beneficial to ensuring the normal operation of the ozone generator 2, the ozone high-voltage power supply cabinet 7, and the ozone booster 442.

[0079] In some embodiments of the present application, the cooling assembly 8 includes a water chiller 81 and a cold water pump 82.

[0080] The water inlet end of the cold water pump 82 is connected to the water outlet end of the water chiller 81 through the fifth pipeline 45. The water outlet end of the cold water pump 82 is respectively connected to the water inlet end of the ozone generator 2, the water inlet end of the ozone high-voltage power supply cabinet 7, and the water inlet end of the ozone booster 442 through the sixth pipeline 46, the seventh pipeline 47, and the eighth pipeline 48. The water outlet ends of the ozone generator 2, the ozone high-voltage power supply cabinet 7, and the ozone booster 442 are respectively connected to the water inlet end of the water chiller 81 through pipelines.

[0081] Specifically, by setting the water chiller 81, the water chiller 81 can provide constant temperature, constant flow, and constant pressure cooling water.

[0082] An electric control valve is provided on the fifth pipeline 45, and a check valve (not shown in the figure) is provided on the pipeline at the water outlet end of the cold water pump 82.

[0083] In some embodiments of the present application, a first flow meter 411, a first valve 412, a first anti-backflow tank 413, and a first check valve 414 are provided on the first pipeline 41. The first check valve 414 is located between the first anti-backflow tank 413 and the gas-liquid mixing pump 4. The first flow meter 411 is used to detect the flow rate of the ozone gas flowing into the first pipeline 41, the first valve 412 is used to control the on-off of the first pipeline 41, and the first anti-backflow tank 413 is used to prevent the ozone gas in the first pipeline 41 from flowing back.

[0084] A second valve 421 and a second check valve 422 are provided on the second pipeline 42 between the gas-liquid mixing pump 4 and the ozone-oxygen water mixing tank 3.

[0085] Specifically, by setting the second valve 421, the second valve 421 can control the on-off of the second pipeline 42, and the second check valve 422 can prevent the liquid in the second pipeline 42 from flowing back.

[0086] In some embodiments of the present application, the device for pulp bleaching further includes an ozone water pump 431, and the ozone water pump 431 is arranged on the third pipeline 43.

[0087] Among them, a third valve 432, a third check valve 433, and a second flowmeter 434 are provided on the third pipeline 43. The third valve 432 and the third check valve 433 are respectively located on both sides of the ozone water pump 431.

[0088] Specifically, by providing the third valve 432, the third valve 432 can control the on / off of the third pipeline 43. The third check valve 433 can prevent the liquid in the third pipeline 43 from flowing back, and the second flowmeter 434 facilitates detecting the flow rate of the liquid in the third pipeline 43.

[0089] In some embodiments of the present application, a third flowmeter 443, a fourth valve 444, a second anti-backflow tank 445, and a fourth check valve 446 are provided on the fourth pipeline 44. The second anti-backflow tank 445 is located between the ozone gas storage tank 441 and the ozone pulp bleacher 5, and the fourth check valve 446 is located between the second anti-backflow tank 445 and the ozone pulp bleacher 5.

[0090] Specifically, by providing the third flowmeter 443 on the fourth pipeline 44, it is convenient to detect the flow rate of the ozone gas in the fourth pipeline 44. By providing the fourth valve 444, it is convenient to control the on / off of the fourth pipeline 44. By providing the second anti-backflow tank 445 between the ozone gas storage tank 441 and the ozone pulp bleacher 5, the backflow of ozone gas can be avoided, protecting the pipeline and equipment from damage. By providing the fourth check valve 446 between the second anti-backflow tank 445 and the ozone pulp bleacher 5, the reverse flow of the ozone gas in the fourth pipeline 44 can be prevented, thereby protecting the equipment.

[0091] In addition, the positional relationship of each component on the pipeline is mainly based on the flow direction of the gas in the pipeline.

[0092] In some embodiments of the present application, the oxygen supply component 1 includes an air compressor 11, a first air storage tank 12, a refrigerated dryer 13, a second air storage tank 14, and an oxygen generator 15 that are connected in sequence; the air compressor 11 is used to compress air to form compressed air, the first air storage tank 12 is used to store compressed air, the refrigerated dryer 13 is used to dry the compressed air, the second air storage tank 14 is used to store the dried compressed air, and the oxygen generator 15 is used to produce oxygen.

[0093] Among them, an oil-water separator 16 is provided between the first air storage tank 12 and the refrigerated dryer 13. The oil-water separator 16 is used to remove moisture and oil from the air; the outlet end of the oxygen generator 15 is connected to a dust removal filter 17, and the outlet end of the dust removal filter 17 is connected to an oxygen discharge port. The dust removal filter 17 mainly includes a low-grade precision filter 171 and a high-grade precision filter 172 to remove impurities such as dust in the oxygen.

[0094] Specifically, a precision filter is provided between the freeze dryer 13 and the second air storage tank 14, and the precision filter is used to deeply remove moisture.

[0095] Specifically, by providing the air compressor 11, the first air storage tank 12, the freeze dryer 13, the second air storage tank 14, and the oxygen generator 15, the on-site air can be purified, and pure air can be used to produce oxygen. Finally, the oxygen is provided to the ozone generator 2 to prepare ozone, which is beneficial to reducing costs such as labor and transportation, and avoiding risks such as insufficient oxygen supply.

[0096] In some embodiments, the oxygen supply component 1 further includes a low-level filter, and the low-level filter is disposed on the side of the oil-water separator 16 close to the freeze dryer 13 for filtering out a large amount of moisture and oil.

[0097] In some embodiments, the oxygen generator 15 uses an adsorbent to separate nitrogen and oxygen to produce oxygen.

[0098] In other embodiments of the present application, the oxygen supply component 1 can be a liquid oxygen tank, and the liquid oxygen tank is filled with liquid oxygen, and the vaporized liquid oxygen serves as the gas source of the ozone generator 2.

[0099] Combined Figure 2 As shown, in some embodiments of the present application, a water distribution pipe 34 is provided in the ozone-water mixing tank 3, and a plurality of water distribution nozzles 35 are spaced apart on the water distribution pipe 34.

[0100] Specifically, by providing the water distribution pipe 34 in the ozone-water mixing tank 3 and the water distribution nozzles 35 on the water distribution pipe 34, the ozone-water mixture can be uniformly reacted with the water in the ozone-water reaction tank in the form of uniform water distribution, increasing the dissolution of ozone gas in water.

[0101] Exemplarily, the water distribution pipe 34 is in a cross shape, a rich shape, a circular shape, etc., but the shape of the water distribution pipe 34 includes but is not limited to the above shapes. The water distribution nozzles 35 are uniformly arranged on the water distribution pipe 34.

[0102] It should be noted that the number of the water distribution nozzles 35 can be set according to the water volume and gas volume of the gas-liquid mixing pump 4, the water spraying and gas spraying volume of a single nozzle, and the service area.

[0103] In some embodiments of the present application, a sight glass observation window is provided on the ozone-water mixing tank 3, which is convenient for the staff to observe the ozone-water mixing effect and timely detect the damage of the water distribution nozzles 35.

[0104] Combined Figure 3 As shown, in some embodiments of the present application, the ozone pulp bleacher 5 includes a tank body 54, an ozone aeration pipe 55, and a stirrer 56.

[0105] A receiving cavity 541 is formed inside the tank body 54. The receiving cavity 541 is used to hold pulp. A liquid level gauge, a maintenance valve and an infrared moisture meter are arranged on the tank body 54. By arranging the infrared moisture meter, it is convenient to take samples in real time to detect the water content in the pulp.

[0106] An inlet 57 is arranged at the upper end of the ozone pulp bleacher 5. The pulp to be bleached, fiber powder or waste paper scraps, etc. enter the ozone pulp bleacher 5 through the inlet 57 and react with high-concentration ozone water to form pulp with a certain concentration.

[0107] The ozone aeration pipe 55 is arranged at the bottom of the receiving cavity 541. The ozone aeration pipe 55 is communicated with the air inlet 52. The ozone aeration pipe 55 is used to aerate ozone gas into the tank body 54 to better dissolve the ozone gas in water.

[0108] The stirrer 56 is arranged on the tank body 54 and is located above the ozone aeration pipe 55. The stirrer 56 is configured to stir the pulp in the receiving cavity 541 to make the pulp more evenly dispersed, facilitating the full contact reaction between the ozone gas and the pulp, so as to achieve the required bleaching effect.

[0109] Specifically, multiple groups of stirrers 56 are arranged in the vertical direction, and the stirring directions of two adjacent groups of stirrers 56 are opposite, which is convenient for the pulp to fully react with ozone.

[0110] Exemplarily, the working process of the device for pulp bleaching in this application is as follows:

[0111] The oxygen preparation process: First, the air compressor 11 compresses the air and sends it into the first air storage tank 12 through a pipeline for storage. The gas discharged from the first air storage tank 12 passes through the oil-water separator 16 and the low-level filter to remove a large amount of moisture and oil in the air. Then the air enters the freeze dryer 13 for drying to remove the remaining moisture in the air. Next, the air discharged from the freeze dryer 13 enters the precision filter for deep water removal; the air after deep water removal enters the second air storage tank 14 for storage. The second air storage tank 14 provides the air required for oxygen production for the oxygen generator 15. The oxygen produced by the oxygen generator 15 is filtered through the low-level precision filter 171 and the high-level precision filter 172 in sequence to remove the dust in the oxygen, and high-concentration pure oxygen is produced.

[0112] Preparation process of ozone: The pure oxygen discharged through the oxygen outlet is sent into the ozone generator 2, and under the control of the ozone high-voltage power cabinet 7, the ozone generator 2 converts the high-concentration pure oxygen into high-concentration ozone gas. A part of the ozone gas enters the gas-liquid mixing pump 4 after flowing through the first pipeline 41, the first valve 412, the first anti-backflow tank 413 and the first check valve 414. Another part of the ozone gas enters the ozone booster 442 after flowing through the fourth pipeline 44, the third flowmeter 443, the fourth valve 444, the second anti-backflow tank 445 and the fourth check valve 446. The ozone booster 442 is used to boost the ozone gas, and the boosted ozone gas is discharged into the ozone storage tank 441 for storage. The ozone storage tank 441 provides ozone gas for the ozone pulp bleacher 5.

[0113] Preparation process of high-concentration ozone water: The recycled tail water from the subsequent pulp process and the ozone-oxygen water mixture discharged from the ozone-oxygen water mixing tank 3 enter the gas-liquid mixing pump 4 through the liquid inlet end of the gas-liquid mixing pump 4 respectively to be mixed with the ozone gas. The mixed ozone-oxygen water enters the ozone-oxygen water mixing tank 3 and is distributed through the water distribution pipe 34 in the ozone-oxygen water mixing tank 3 to make the ozone and water fully mixed.

[0114] Pressurization process of ozone gas: Open the fourth valve 444. After the low-pressure and high-concentration ozone gas produced by the ozone generator 2 enters the fourth pipeline 44, the flow rate of the ozone gas is detected by the third flowmeter 443, and it enters the ozone booster 442 through the second anti-backflow tank 445 and the fourth check valve 446 for pressurization. If the intake air volume is insufficient, open the valve of the pipeline parallel to the ozone booster 442 for reflux to ensure the stable operation of the ozone booster 442. The pressurized ozone gas enters the ozone storage tank 441 for storage. The ozone storage tank 441 provides ozone gas for the ozone pulp bleacher 5.

[0115] Pulp bleaching process: Open the third valve 432 and the third check valve 433. The ozone water discharged from the drain port 32 at the bottom of the ozone-oxygen water mixing tank 3 enters the third pipeline 43. Under the action of the ozone water pump 431, the ozone water is transported to the ozone pulp bleacher 5. At the same time, the ozone gas entering the ozone pulp bleacher 5 is aerated through the ozone aeration pipe 55, and the stirrer 56 stirs the pulp to make the pulp fully contact with the ozone, thereby bleaching the pulp.

[0116] Ozone tail gas treatment process: The unreacted ozone gas in the ozone gas-water mixing tank 3 is connected to the ozone tail gas destroyer 6 through the first exhaust port 33 at its top. The unreacted ozone gas in the ozone pulp bleacher 5 is connected to the ozone tail gas destroyer 6 through the second exhaust port 53 at its top. The safety valve in the ozone storage tank 441 is connected to the ozone tail gas destroyer 6 through a pipeline. The ozone gas discharged due to overpressure relief of the safety valve in the ozone storage tank 441 is discharged into the ozone tail gas destroyer 6 through the pipeline. The ozone tail gas destroyer 6 decomposes the ozone gas by means of heating and catalysis. After the tail gas concentration detector on the discharge pipe 61 detects that it meets the standard, it can be discharged outdoors. In actual application, an air valve is provided on the pipeline connecting the first exhaust port 33 of the ozone gas-water mixing tank 3 to the ozone tail gas destroyer 6. When the amount of unreacted ozone gas in the ozone pulp bleacher 5 or the unreacted ozone gas in the ozone pulp bleacher 5 or the ozone gas discharged due to the pressure relief of the safety valve of the ozone storage tank 441 that is separately treated by the ozone tail gas destroyer 6 is small, the air valve opens to supplement an appropriate amount of air to ensure the stability of the gas volume processed by the ozone tail gas destroyer 6.

[0117] Cooling process of the ozone generator 2: The water chiller 81 produces cold water through the refrigerant. The cold water enters the cold water pump 82 through the fifth pipeline 45. Then, a part of the cold water is sent into the ozone generator 2 through the sixth pipeline 46 to cool down the ozone generator 2; a part of the cold water is sent into the cooling water circuit inside the ozone high-voltage power cabinet 7 through the seventh pipeline 47 to cool the ozone high-voltage power cabinet 7; and a part of the cold water is sent into the cooling water circuit inside the ozone booster 442 through the eighth pipeline 48 to cool the ozone booster 442. The water that exchanges heat with the ozone generator 2, the ozone high-voltage power cabinet 7, and the ozone booster 442 respectively returns to the water chiller 81 through the pipeline for circulation.

[0118] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0119] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, for those of ordinary skill in the art, it is still possible to modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions required to be protected by the present invention.

Claims

1. An apparatus for pulp bleaching, characterized in that, Comprising: An oxygen supply component, on which an oxygen discharge port is provided; An ozone generator for generating ozone gas; An ozone-water mixing tank, on which an air-water inlet is formed, a liquid discharge port is formed at its bottom, and a first exhaust port is formed at its top; A gas-liquid mixing pump, whose air inlet end is connected to the air outlet end of the ozone generator through a first pipeline, whose liquid inlet end is connected to the liquid discharge port through a second pipeline, and whose outlet end is connected to the air-water inlet; An ozone pulp bleacher, whose bottom is formed with a water inlet and an air inlet, whose top is formed with a second exhaust port, the water inlet is connected to the liquid discharge port through a third pipeline, and the air inlet is connected to the air outlet end of the ozone generator through a fourth pipeline; An ozone tail gas destroyer, the first exhaust port and the second exhaust port are both connected to the ozone tail gas destroyer through pipelines, and the ozone tail gas destroyer is configured to decompose and process the unreacted ozone gas from the ozone-water mixing tank and the ozone pulp bleacher.

2. The apparatus for pulp bleaching according to claim 1, characterized in that, The device for pulp bleaching further includes: An ozone gas storage tank, which is arranged on the fourth pipeline and is configured to store ozone gas and supply ozone gas to the ozone pulp bleacher; An ozone booster, which is arranged on the fourth pipeline and is located on the side of the ozone gas storage tank away from the ozone pulp bleacher, and is configured to boost the ozone gas flowing into the fourth pipeline.

3. The device for pulp bleaching according to claim 2, characterized in that, The device for pulp bleaching further includes: An ozone high-voltage power cabinet, which is configured to provide high-frequency high-voltage electric energy for the ozone generator; A cooling component, which is configured to cool down the ozone generator, the ozone high-voltage power cabinet and the ozone booster.

4. The apparatus for pulp bleaching according to claim 3, characterized in that, The cooling component includes: A water chiller; A cold water pump; The water inlet end of the cold water pump is connected to the water outlet end of the water chiller through a fifth pipeline, and the water outlet end of the cold water pump is respectively connected to the water inlet end of the ozone generator, the water inlet end of the ozone high-voltage power cabinet and the water inlet end of the ozone booster through a sixth pipeline, a seventh pipeline and an eighth pipeline; the water outlet ends of the ozone generator, the ozone high-voltage power cabinet and the ozone booster are respectively connected to the water inlet end of the water chiller through pipelines.

5. The apparatus for pulp bleaching according to claim 1, characterized in that, A first flowmeter, a first valve, a first anti-backflow tank and a first check valve are arranged on the first pipeline, and the first check valve is located between the first anti-backflow tank and the gas-liquid mixing pump; A second valve and a second check valve are arranged on the second pipeline.

6. The apparatus for pulp bleaching according to claim 1, characterized in that, The device for pulp bleaching further includes: An ozone water pump, which is arranged on the third pipeline; Wherein, a third valve, a third check valve and a second flowmeter are arranged on the third pipeline.

7. The apparatus for pulp bleaching according to claim 2, characterized in that, A third flowmeter, a fourth valve, a second anti-backflow tank and a fourth check valve are arranged on the fourth pipeline, the second anti-backflow tank is located between the ozone gas storage tank and the ozone pulp bleacher, and the fourth check valve is located between the second anti-backflow tank and the ozone pulp bleacher.

8. The apparatus for pulp bleaching according to claim 1, characterized in that, The oxygen supply component includes: An air compressor, a first air storage tank, a refrigerated dryer, a second air storage tank and an oxygen generator that are connected in sequence; Wherein, an oil-water separator is provided between the first air storage tank and the freeze dryer; an air outlet end of the oxygen generator is connected with a dust removal filter, and an air outlet end of the dust removal filter is connected with the oxygen discharge port.

9. The device for pulp bleaching according to claim 1, characterized in that, A water distribution pipe is arranged in the ozone-water mixing tank, and a plurality of water spray nozzles are arranged at intervals on the water distribution pipe.

10. The apparatus for pulp bleaching according to claim 1, characterized in that, The ozone pulp bleacher includes: A tank body, which forms an accommodation cavity therein; An ozone aeration pipe, which is arranged at the bottom of the accommodation cavity and is communicated with the air inlet; A stirrer, which is arranged on the tank body and above the ozone aeration pipe, and is configured to stir the pulp in the accommodation cavity.

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