A pulping device

Abstract

The application discloses a pulp preparation device for preparing desulfurization slurry, which comprises a slurry pool with a containing cavity containing raw materials, a stirring device arranged in the containing cavity and used for stirring the raw materials to prepare the desulfurization slurry, a pump and a suction pipe, one end of the suction pipe being arranged in the containing cavity and the other end of the suction pipe being communicated with the pump and used for conveying the desulfurization slurry out of the containing cavity, an aeration device and a first gas pipe, one end of the first gas pipe being arranged in the containing cavity and the other end of the first gas pipe being communicated with the aeration device and used for conveying gas into the containing cavity. The raw materials in the slurry pool are uniformly mixed through the stirring device, meanwhile, the aeration device is arranged to convey gas into the slurry pool through the first gas pipe, so that the gas further disperses the desulfurization slurry; through the synergistic effect of the stirring and the aeration, the slurry is more uniform and delicate, the agglomeration and caking of the slurry are effectively prevented, and the stability and quality of the slurry are improved.

Description

Technical Field

[0001] This application belongs to the field of desulfurization slurry preparation technology, specifically relating to a slurry preparation device. Background Technology

[0002] When industrial production involves burning raw materials such as petroleum, coal, and natural gas, flue gas containing sulfur dioxide is generated. Flue gas desulfurization (FGD) uses alkaline absorbents or adsorbents to capture sulfur dioxide and convert it into stable and easily separable sulfur compounds or elemental sulfur. Based on the operating conditions and the type of desulfurizing agent, FGD can be divided into three categories: wet, semi-dry, and dry. Wet desulfurization technology is the most widely used, often employing a slurry formed from limestone and / or magnesium oxide as the desulfurizing agent.

[0003] However, existing pulping equipment used to mix limestone and / or magnesium oxide to form slurry is prone to slurry agglomeration and clumping due to the presence of a stirring "blind zone" in the stirring shaft. This can easily lead to centrifugal pump blockage and increased equipment maintenance costs. Utility Model Content

[0004] The present application provides a pulping device that aims to solve the problem that existing slurry tanks are prone to slurry coagulation and clumping, which in turn easily leads to centrifugal pump blockage and increased equipment maintenance costs.

[0005] This application provides a slurry preparation apparatus for preparing desulfurization slurry, comprising: a slurry tank having a receiving cavity for containing raw materials; a stirring device disposed in the receiving cavity for stirring the raw materials to prepare the desulfurization slurry; a pump and a suction pipe, one end of the suction pipe being disposed in the receiving cavity and the other end being connected to the pump for conveying the desulfurization slurry to the outside of the receiving cavity; an aeration device and a first gas pipe, one end of the first gas pipe being disposed in the receiving cavity and the other end being connected to the aeration device for conveying gas into the receiving cavity.

[0006] Optionally, the receiving cavity includes a stirring area and multiple aeration areas, the stirring device is disposed in the stirring area, and each aeration area is provided with at least one first air pipe; the multiple aeration areas are symmetrically arranged about the center of the stirring area.

[0007] Optionally, a plurality of the first air tubes are arranged around the stirring shaft of the stirring device.

[0008] Optionally, the first air pipe is a flexible hose that can move freely relative to the slurry tank, and an aeration head is connected to one end of the first air pipe in the slurry tank.

[0009] Optionally, the first trachea includes a fixed section and a free section, one end of the fixed section is connected to the air outlet, the other end of the fixed section is connected to one end of the free section, and the other end of the free section is disposed in the receiving cavity; The fixed section is fixed relative to the slurry tank, the free section is free to move relative to the slurry tank, and the other end of the free section is connected to an aeration head.

[0010] Optionally, one end of the first trachea is located at the bottom of the receiving cavity.

[0011] Optionally, the suction tube is a telescopic tube, which can extend to the bottom of the receiving cavity or shorten to outside the receiving cavity.

[0012] Optionally, a second air tube is also included, one end of which is connected to a gas source and the other end is connected to the suction tube for introducing gas into the suction tube.

[0013] Optionally, it also includes a solid dosing device for adding solid materials to the slurry tank, and a liquid dosing device for adding liquid materials to the slurry tank.

[0014] Optionally, a level gauge is also included, which is disposed in the slurry tank.

[0015] The technical solutions provided in this application have the following advantages compared with the prior art: In this embodiment, the raw materials in the slurry tank are mixed evenly by a stirring device. At the same time, an aeration device is set up to transport gas into the slurry tank through a first air pipe, so that the gas further disperses the desulfurization slurry. Through the synergistic effect of stirring and aeration, the slurry is made more uniform and delicate, effectively preventing the slurry from agglomerating and clumping, and improving the stability and quality of the slurry. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a pulping device provided in this application. Explanation of reference numerals in the attached drawings: 1-slurry tank, 11-containment cavity; 2-stirring device; 3-first air pipe, 31-aeration head; 4-pump, 41-suction pipe, 42-second air pipe; 5-solid dosing device; 6-liquid dosing device; 7-liquid level gauge. Detailed Implementation

[0017] To enable those skilled in the art to better understand this application, the technical solution of this application will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] like Figure 1As shown, this application provides a slurry preparation apparatus for preparing desulfurization slurry, comprising: a slurry tank 1 having a receiving cavity 11 for containing raw materials; a stirring device 2 disposed in the receiving cavity 11 for stirring the raw materials to prepare desulfurization slurry; a pump 4 and a suction pipe 41, one end of the suction pipe 41 being disposed in the receiving cavity 11 and the other end being connected to the pump 4 for conveying the desulfurization slurry to the outside of the receiving cavity 11; an aeration device and a first air pipe 3, one end of the first air pipe 3 being disposed in the receiving cavity 11 and the other end being connected to the aeration device for conveying gas into the receiving cavity 11. Optionally, the pump 4 can be a centrifugal pump.

[0019] Understandably, the stirring device 2 uses a stirring shaft to drive the stirring blades to rotate, mechanically stirring the slurry in the slurry tank 1 to uniformly mix solid particles with the liquid, thereby improving the uniformity and stability of the desulfurization slurry. Specifically, when the stirring shaft of the stirring device 2 rotates, it drives the stirring blades to make circular motions, causing the slurry to flow and generate shear force, thus dispersing and uniformly distributing solid particles in the liquid medium. However, because there are some spatial areas in the stirring device 2 that cannot be effectively covered by the stirring blades, these areas are the "blind spots" of stirring. This leads to insufficient stirring of the desulfurization slurry in these blind spots, resulting in localized coagulation and agglomeration.

[0020] In this embodiment, an aeration device is also provided in addition to the stirring device 2. Gas is introduced into the slurry tank 1 through the aeration device to generate a large number of bubbles, so that a gas-liquid mixing flow field is formed inside the slurry. During the rising process, the bubbles fully contact the slurry and generate turbulence, which drives the slurry to flow. This forms a synergistic effect with the mechanical stirring action of the stirring device 2, so that the slurry is more fully mixed and dispersed in various areas, effectively breaking the stirring blind zone, reducing the phenomenon of slurry coagulation and agglomeration, reducing the risk of centrifugal pump blockage, improving the uniformity and fluidity of the slurry, and improving the working efficiency and operational stability of the entire pulping device.

[0021] Specifically, in the preparation of desulfurization slurry, raw materials and water are first added to the containment chamber 11 of the slurry tank 1 in a certain proportion. Then, the stirring device 2 is started, driving the stirring blades to rotate via the stirring shaft, initially stirring the slurry and allowing the raw materials and water to mix initially to form a slurry. Next, the aeration device is started, introducing gas into the slurry tank 1 through the first air pipe 3. The gas forms a large number of bubbles upon entering the slurry. As the bubbles rise, they fully contact the slurry, generating turbulence and driving the slurry flow. This complements and works synergistically with the stirring action of the stirring device 2, ensuring more thorough mixing and dispersion of the slurry in various areas. As the stirring device 2 and the aeration device continue operating, the slurry gradually becomes more uniform and fine until it reaches the required preparation standard. At this point, the pump 4 can be started, and the prepared desulfurization slurry can be transported to the flue gas desulfurization system for subsequent desulfurization treatment through the suction pipe 41.

[0022] In some embodiments, the raw materials for preparing the desulfurization slurry include limestone and / or magnesium oxide, and the slurry made of limestone or magnesium oxide is used to absorb and remove polluting gases such as sulfur dioxide, particulate matter, and nitrogen oxides.

[0023] In some embodiments, the gas to be purified can be directly introduced into the slurry tank 1 of the slurry preparation device in this embodiment, and the desulfurization slurry stored in the slurry tank 1 can be used to purify the gas. In other embodiments, the desulfurization slurry in the slurry tank 1 of this embodiment can also be transported to a dedicated flue gas desulfurization station (such as a flue gas desulfurization tower) through a pump 4 and a suction pipe 41, where the gas is purified.

[0024] In some embodiments, the accommodating cavity 11 includes a stirring zone and a plurality of aeration zones, the stirring device 2 is disposed in the stirring zone, and each aeration zone is provided with at least one first air pipe 3; the plurality of aeration zones are arranged symmetrically about the center of the stirring zone.

[0025] It should be explained that the stirring device 2 mainly acts on the slurry within the stirring area, mechanically agitating it. Although the slurry in the surrounding aeration area is also affected by the stirring device 2, the distance between them means that the further away from the stirring device 2, the less effective the agitation. Some areas within the aeration area may be unaffected or minimally affected, potentially leading to insufficient mixing, sedimentation, or clumping. The aeration devices in each aeration area, through the first air pipe 3, introduce gas into the slurry, generating numerous bubbles. These bubbles, as they rise, drive the slurry flow, thus agitating and mixing the slurry within the aeration area. This effectively compensates for the insufficient agitation effect of the stirring device 2 in more distant areas, ensuring more thorough mixing of the slurry throughout the entire slurry tank 1. This reduces sedimentation and clumping caused by insufficient agitation, improving the overall uniformity and stability of the slurry.

[0026] Specifically, multiple aeration zones are arranged symmetrically about the center of the mixing zone. This symmetrical layout is conducive to forming a uniform and orderly gas-liquid mixing flow field in the slurry tank 1. When the bubbles generated by aeration rise, they can impact and drive the slurry flow uniformly from multiple directions, complementing and enhancing the mixing effect of the mixing device 2.

[0027] In some embodiments, the space of the receiving cavity 11 is cubic in shape, and the stirring area should be located at the center of the receiving cavity 11. There may be overlap between multiple aeration areas and stirring areas.

[0028] In some embodiments, a plurality of first air tubes 3 are arranged around the stirring shaft of the stirring device 2. Preferably, the plurality of first air tubes 3 are evenly arranged around the stirring shaft of the stirring device 2.

[0029] It should be noted that the first trachea 3 can be a flexible tube, a rigid tube, or a combination of flexible and rigid tubes. This embodiment does not limit this. The following are examples of two possible implementation methods.

[0030] In the first embodiment, the first air pipe 3 is a flexible hose that can move freely relative to the slurry tank 1, and an aeration head 31 is connected to one end of the first air pipe 3 located in the slurry tank 1.

[0031] In this embodiment, the hose and aeration head 31 can automatically turn and move according to the direction and force of the airflow. This helps the aeration head 31 better adapt to the changes in the flow field within the slurry tank 1, ensuring that bubbles are evenly distributed in the slurry and improving the aeration effect. Furthermore, since the first air pipe 3 is a flexible hose and can move freely relative to the slurry tank 1, it can be easily removed from the slurry tank 1 when the aeration device is not needed, facilitating maintenance and cleaning.

[0032] In the second embodiment, the first air pipe 3 includes a fixed section and a free section. One end of the fixed section is connected to the air outlet, and the other end of the fixed section is connected to one end of the free section. The other end of the free section is disposed in the receiving cavity 11. The fixed section is fixed relative to the slurry tank 1, and the free section can move freely relative to the slurry tank 1. The other end of the free section is connected to an aeration head 31.

[0033] In this embodiment, the flexibility of the free section allows the aeration head 31 to automatically turn and move its position according to the direction and force of the airflow, ensuring uniform bubble distribution, improving the aeration effect, and further enhancing the mixing uniformity of the slurry. The fixed section ensures a stable connection between the air pipe and the aeration device, guaranteeing reliable gas delivery and improving the stability of equipment operation.

[0034] In other embodiments, the first air pipe 3 may also be a rigid pipe or flexible pipe that is fixed relative to the slurry pool 1, and the opening of the first air pipe 3 is facing downward in the receiving cavity 11.

[0035] In some embodiments, one end of the first air pipe 3 is disposed at the bottom of the receiving cavity 11. When the aeration device is in operation, gas is released from the bottom, forming a large number of bubbles. These bubbles come into full contact with the slurry as they rise, driving the slurry to flow and creating a bottom-up stirring effect, thus optimizing the aeration process.

[0036] In some embodiments, the suction tube 41 is a telescopic tube that can extend to the bottom of the receiving cavity 11 or shorten to outside the receiving cavity 11.

[0037] It should be explained that in the prior art, the suction pipe 41 is usually fixed inside the slurry tank 1, even when not in use. Prolonged idleness can cause slurry to gradually deposit and clump inside the suction pipe 41, eventually leading to blockage. This blockage not only reduces suction efficiency but may also damage the pump 4 and other related equipment, increasing maintenance costs and equipment downtime. In this embodiment, by designing a retractable suction pipe 41, the suction pipe 41 can be shortened and removed from the slurry tank 1 when slurry extraction is not required. This effectively avoids direct contact between the suction pipe 41 and the slurry when idle, thereby reducing the risk of clumping and blockage.

[0038] Furthermore, since the suction pipe 41 in this application is a telescopic pipe, before the pulping device is started, the length of the suction pipe 41 can be adjusted according to the liquid level in the slurry tank 1 and the position of the slurry to be extracted, so that it extends to the bottom of the slurry tank 1 or the required depth, ensuring that the suction pipe 41 can effectively extract slurry at different liquid levels and depths, thereby improving the efficiency and flexibility of slurry extraction.

[0039] In some embodiments, a second air tube 42 is also included, one end of which is connected to an air source and the other end is connected to a suction tube 41 for introducing gas into the suction tube 41.

[0040] It is understandable that the suction pipe 41 is prone to blockage due to the deposition and agglomeration of solid particles in the slurry, especially when it is not used for a long time. In traditional methods, cleaning a blocked suction pipe 41 usually requires manual disassembly and cleaning, which is cumbersome and time-consuming. In this embodiment, when the suction pipe 41 becomes blocked, high-pressure gas is introduced into the suction pipe 41 through the second air pipe 42. The impact force of the high-pressure gas is used to flush out the blockage, thereby clearing the blockage of the suction pipe 41. When the suction pipe 41 is not in use, gas can also be introduced periodically through the second air pipe 42 to purge the inside of the suction pipe 41 and prevent the slurry from remaining in the suction pipe 41 for a long time and agglomerating and blocking it.

[0041] It should be explained that during the operation of pump 4, suction pipe 41 is used to extract slurry from the bottom of the pool and transport it outside the pool, at which time the second air pipe 42 is not working.

[0042] In some embodiments, the system further includes a solid dosing device 5 for adding solid materials to the slurry tank 1, and a liquid dosing device 6 for adding liquid materials to the slurry tank 1. The solid materials may be magnesium oxide, limestone, etc., and the liquid materials may be water. In some embodiments, the solid dosing device 5 is a dosing funnel disposed on the upper side of the slurry tank 1; the liquid dosing device 6 is a liquid pipe connected to the receiving cavity 11.

[0043] In some embodiments, a level gauge 7 is also included. The level gauge 7 is disposed in the slurry tank 1 and is used to monitor the slurry level to ensure the normal operation of the slurry preparation device in this embodiment.

[0044] In some embodiments, the level gauge 7 may be a magnetic float level gauge, an internal float level gauge, a magnetic flap level gauge, etc., and this embodiment does not limit this.

[0045] In some embodiments, both the pump 4 and the liquid adding device 6 are equipped with flow regulating valves. In some embodiments, the pump 4 is also equipped with a flow meter.

[0046] In some embodiments, a control device is also included. The control device is electrically or signal-connected to various electronic devices such as the pump 4, flow regulating valve, and level gauge 7. The control device may be provided with an operation interface. Through the operation interface, the opening degree of the flow regulating valve, the liquid level of the slurry tank 1, and the slurry flow rate output by the pump 4 can be viewed, so as to adjust the dosage of the liquid dosing device 6 and the solid dosing device 5, as well as the pumping volume of the pump 4 accordingly.

[0047] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0048] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A pulping apparatus for preparing desulfurization slurry, characterized in that, include: A slurry tank, having a cavity for holding raw materials; A stirring device, disposed in the receiving cavity, is used to stir the raw materials to prepare the desulfurization slurry; A pump and a suction pipe, one end of which is disposed in the receiving cavity and the other end is connected to the pump, for conveying the desulfurization slurry to the outside of the receiving cavity; An aeration device and a first air pipe, one end of the first air pipe being disposed in the receiving cavity and the other end being connected to the aeration device, for conveying gas into the receiving cavity.

2. The pulping apparatus according to claim 1, characterized in that, The accommodating cavity includes a stirring zone and multiple aeration zones. The stirring device is disposed in the stirring zone, and each aeration zone is provided with at least one first air pipe. The multiple aeration zones are arranged symmetrically about the center of the stirring zone.

3. The pulping apparatus according to claim 2, characterized in that, Multiple first air tubes are arranged around the stirring shaft of the stirring device.

4. The pulping apparatus according to claim 1, characterized in that, The first air pipe is a flexible hose that can move freely relative to the slurry tank, and an aeration head is connected to one end of the first air pipe in the slurry tank.

5. The pulping apparatus according to claim 1, characterized in that, The first air tube includes a fixed section and a free section. One end of the fixed section is connected to the air outlet of the aeration device, and the other end of the fixed section is connected to one end of the free section. The other end of the free section is disposed inside the receiving cavity. The fixed section is fixed relative to the slurry tank, the free section is free to move relative to the slurry tank, and the other end of the free section is connected to an aeration head.

6. The pulping apparatus according to claim 1, characterized in that, One end of the first trachea is located at the bottom of the receiving cavity.

7. The pulping apparatus according to claim 1, characterized in that, The suction tube is a telescopic tube, which can extend to the bottom of the receiving cavity or shorten to outside the receiving cavity.

8. The pulping apparatus according to claim 1, characterized in that, It also includes a second air tube, one end of which is connected to a gas source and the other end is connected to the suction tube, for introducing gas into the suction tube.

9. The pulping apparatus according to claim 1, characterized in that, It also includes a solid dosing device for adding solid materials to the slurry tank, and a liquid dosing device for adding liquid materials to the slurry tank.

10. The pulping apparatus according to claim 1, characterized in that, It also includes a level gauge, which is installed in the slurry tank.

Images