Negative pressure sizing device and negative pressure sizing method

Abstract

The invention provides a negative pressure sizing device and a negative pressure sizing method, and belongs to the technical field of calcium carbonate production. The negative pressure sizing device comprises a sizing pump, a slurry conveying channel, a negative pressure generation assembly, a switching valve and a control assembly; the lower end of the slurry conveying channel is communicated with the discharge end of the slurry feeding pump, and the upper end of the slurry conveying channel is communicated with the carbonization tower. The negative pressure generating assembly is communicated with the slurry conveying channel, and local negative pressure is formed in the slurry conveying channel by inputting and discharging media. The switching valve is arranged on the slurry conveying channel and used for switching the communication state of the slurry conveying channel and the carbonization tower or the negative pressure generation assembly. The control assembly comprises a monitor for monitoring the slurry level of the slurry conveying channel and a controller electrically connected with the switching valve and the slurry feeding pump. According to the negative pressure sizing device and the negative pressure sizing method, local negative pressure is formed in the sizing conveying channel through the negative pressure generating assembly, sizing is assisted through the negative pressure, the instantaneous load of the sizing pump is reduced, and the operation and maintenance cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of calcium carbonate production, and more specifically relates to a negative pressure sizing device and a negative pressure sizing method. Background Art

[0002] In the chemical industry, lime is often used as a key raw material in carbonization processes. After the lime (primarily composed of calcium oxide) undergoes a digestion reaction, it is thoroughly mixed with water to produce a calcium hydroxide slurry (i.e., lime slurry). This process is a key step in lime pretreatment. The resulting lime slurry is further transported to a carbonization tower, where it undergoes a carbonization reaction with the carbon dioxide gas within the tower, ultimately producing the target product, calcium carbonate.

[0003] Currently, the transportation of lime slurry from the digestion unit to the carbonization tower is typically accomplished by a sizing pump. As a power device, the sizing pump mechanically extracts the viscous lime slurry from the storage container and pressurizes it through a pipeline system to the feed inlet of the carbonization tower.

[0004] The inventors found that due to the high concentration of calcium hydroxide in the lime slurry and the presence of incompletely digested particulate impurities, the overall viscosity of the slurry is relatively high and the fluidity is relatively poor. When the sizing pump is started directly, the pump body needs to overcome the high viscosity resistance of the slurry in a short period of time, resulting in a sharp increase in the instantaneous load of the motor. In long-term operation, this phenomenon will cause the motor windings to heat up and the insulation to age. In severe cases, it may even cause the motor to burn out. Therefore, the equipment needs to be frequently repaired or replaced. Frequent repair or replacement of equipment will not only interrupt the production process, but also significantly increase the operation and maintenance costs, becoming an important bottleneck restricting the improvement of production efficiency. Summary of the Invention

[0005] The purpose of this application is to provide a negative pressure sizing device and a negative pressure sizing method to solve the technical problem that when the sizing pump is directly started to transport lime slurry, the instantaneous load of the motor will increase sharply, and long-term operation may easily cause the motor winding to heat up, the insulation to age or even burn out, and thus frequent maintenance or replacement of equipment is required.

[0006] To achieve the above objectives, the technical solution adopted in this application is: A negative pressure sizing device is provided for inputting slurry from a digestion device into a carbonization tower, comprising a sizing pump for communicating with the digestion device; the negative pressure sizing device further comprising: a slurry transport channel, arranged vertically between the sizing pump and the carbonization tower; the lower end of the slurry transport channel is connected to the discharge end of the sizing pump, and the upper end thereof is connected to the carbonization tower; a negative pressure generating component, connected to the slurry transport channel, for inputting a medium into the slurry transport channel and for discharging the medium in the slurry transport channel so as to place the slurry transport channel in a local negative pressure state; a switching valve, provided on the slurry transport channel, for connecting the slurry transport channel with the carbonization tower, or connecting the slurry transport channel with the negative pressure generating component; and A control component, comprising a monitor for monitoring the slurry level in the slurry transport channel, and a controller electrically connected to the switching valve and the slurry pump; the monitor is electrically connected to the controller, and the monitor is capable of presetting a height value; When the slurry level in the slurry transport channel reaches the preset value of the monitor, the medium in the slurry transport channel is drained; at the same time, the monitor sends a signal to the controller, so that the controller controls the switching valve to switch to the state where the slurry transport channel is connected to the carbonization tower, and controls the slurry pump to start.

[0007] In one possible implementation, the negative pressure generating component includes: A liquid storage tank for storing fluid medium; a liquid infusion tube, one end of which is connected to the liquid storage tank via a water pump, and the other end of which is connected to the slurry transport channel via the switching valve; The water pump is used to provide bidirectional suction so that the fluid medium in the liquid storage tank is discharged into the slurry transport channel through the liquid infusion tube, or the fluid medium in the slurry transport channel is discharged back to the liquid storage tank through the liquid infusion tube.

[0008] In a possible implementation, the slurry transport channel has a mounting hole extending radially therethrough, and the monitor includes: a swing rod inserted into the mounting hole so that its two ends are respectively located at the inner and outer sides of the slurry transport channel; one end of the swing rod located in the slurry transport channel is connected to a resistance member, and the slurry in the slurry transport channel can transmit a force to the resistance member to cause the swing rod to swing; and A tension sensor is arranged outside the slurry transport channel, and a pull rod is provided between the tension sensor and the swing rod; one end of the pull rod is connected to the tension sensor, and the other end thereof is hinged to the swing rod; The tension sensor can preset a tension value, and its signal output end is electrically connected to the controller.

[0009] In a possible implementation, the resistance member includes: a mounting roller, coaxially disposed in the slurry transport channel, and connected to one end of the swing rod in the slurry transport channel; and A plurality of blades are arranged at intervals along the circumference of the installation roller, and each of the blades extends spirally along the axial direction of the installation roller.

[0010] In a possible implementation, a guide member is coaxially provided at the lower end of the mounting roller, and the diameter of the guide member gradually decreases from top to bottom.

[0011] In a possible implementation, a one-way valve is provided between the slurry transport channel and the slurry pump to limit the slurry in the slurry transport channel from returning to the slurry pump.

[0012] In a possible implementation, the negative pressure sizing device further includes: The pretreatment component is used to communicate with the digestion device to accommodate the slurry discharged from the digestion device and pretreat the slurry; the pretreatment component is also communicated with the sizing pump to discharge the slurry to the sizing pump.

[0013] In one possible implementation, the preprocessing component includes: a storage tank, connected to the digestion device to store the slurry discharged from the digestion device; the storage tank is also connected to the sizing pump to discharge the slurry to the sizing pump; and A stirring roller is disposed in the storage tank and has the freedom to rotate with the vertical direction as the axis; the stirring roller has multiple groups of blades arranged at intervals along the axial direction thereof, and each group of blades includes multiple blades arranged at intervals along the circumference of the stirring roller; the stirring roller is connected to a swing mechanism to swing the stirring roller in the horizontal direction; and The drive motor has a power output shaft that is in transmission connection with the stirring roller so that the stirring roller rotates around its axis to stir the slurry in the storage tank.

[0014] In a possible implementation, the swing mechanism includes: A swing seat, one end of which is hinged to the material storage tank and the other end of which is rotatably connected to the stirring roller; the hinge axis of the swing seat is parallel to the axis of the stirring roller; and The power output shaft of the rotating motor is connected with the swing seat in a transmission manner so that the swing seat drives the stirring roller to swing in a horizontal direction.

[0015] In an embodiment of the present application, the slurry transport channel is vertically placed between the slurry pump and the carbonization tower, with the lower end connected to the discharge end of the slurry pump and the upper end selectively connected to the carbonization tower or the negative pressure generating component through a switching valve. The controller initializes the preset liquid level height value of the monitor. The control component starts the negative pressure generating component, first inputs the medium into the slurry transport channel, and then discharges the medium, so that a local negative pressure state is formed in the slurry transport channel. At this time, the switching valve is in the "slurry transport channel-negative pressure generating component" connection state, and the slurry pump is closed. Under the action of negative pressure, the slurry in the digestion device is sucked into the slurry transport channel through the inlet of the slurry pump, and the slurry rises along the vertical channel. The monitor monitors the slurry level in the slurry transport channel in real time. When the liquid level reaches the preset height value, the residual medium in the slurry transport channel is completely emptied; at the same time, the monitor sends a signal to the controller. After receiving the signal, the controller controls the switching valve to switch to the "slurry transport channel-carbonization tower" connection state, and starts the slurry pump to pump the slurry in the slurry transport channel into the carbonization tower.

[0016] Compared with the prior art, the negative pressure sizing device provided in the embodiment of the present application pre-lifts the slurry by negative pressure, thereby reducing the load at the start of the sizing pump and reducing energy consumption; the vertical slurry transport channel is combined with the negative pressure effect to improve the slurry delivery efficiency. By pre-lifting the slurry by negative pressure, a local negative pressure is formed in the slurry transport channel before the sizing pump is started. The slurry rises to the preset liquid level under the action of negative pressure, reducing the instantaneous resistance of the pump body at the start. This design directly alleviates the problem of a sharp increase in motor load caused by the traditional sizing pump to overcome the resistance of high-viscosity slurry, reduces the risk of motor winding heating and insulation aging, avoids motor burnout failure, and reduces the frequency of equipment maintenance and replacement.

[0017] In view of the high viscosity and low fluidity of lime slurry, the negative pressure pre-lift mechanism improves the smoothness of slurry transportation. Combined with the real-time feedback of the monitor and the linkage adjustment of the controller, it ensures that the slurry enters the carbonization tower stably according to the preset parameters, avoids the influence of flow fluctuation on the carbonization reaction efficiency, and improves the quality stability of the target product.

[0018] The technical solution adopted in this application also provides a negative pressure sizing method, based on the negative pressure sizing device described in any one of the above contents, comprising the following steps: A. The sizing pump is turned off, and the controller controls the switching valve to operate, switching the switching valve to a state where the slurry transport channel is connected to the negative pressure generating component; B. controlling the negative pressure generating component to start by the controller to input the medium into the slurry transport channel; C. controlling the negative pressure generating assembly to operate in reverse by the controller to discharge the medium in the slurry transport channel, so that the slurry transport channel is in a local negative pressure state; the slurry transport channel in the local negative pressure state draws the slurry in the digestion device into the slurry transport channel; D. When the monitor monitors that the liquid level of the slurry in the slurry conveying channel reaches the preset value, the monitor sends a signal to the controller, and the controller controls the switching valve to switch to a state in which the slurry conveying channel is in communication with the carbonization tower; meanwhile, the controller controls the slurry feeding pump to be turned on.

[0019] The negative pressure slurry feeding method provided by the embodiment has the same beneficial effects as those of the negative pressure slurry feeding device described above, and thus will not be described here again. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0021] Figure 1 A perspective structural schematic diagram of the negative pressure slurry feeding device provided by the embodiment of the present application is shown in the figure. Figure 2 A front view structural schematic diagram of the negative pressure slurry feeding device provided by the embodiment of the present application is shown in the figure. Figure 3 A top view structural schematic diagram of the negative pressure slurry feeding device provided by the embodiment of the present application is shown in the figure. Figure 4 A side view structural schematic diagram of the negative pressure slurry feeding device provided by the embodiment of the present application is shown in the figure. Figure 5 A sectional view structural schematic diagram along line A-A in the figure. Figure 4 Figure 6 A perspective structural schematic diagram of the monitor used by the embodiment of the present application is shown in the figure. Figure 7 A top view structural schematic diagram of the monitor shown in the figure. Figure 6 Figure 8 A sectional view structural schematic diagram along line B-B in the figure. Figure 7 In the figure, various reference signs represent: 1, slurry feeding pump; 2, slurry conveying channel; 3, negative pressure generating assembly; 31, liquid storage tank; 32, liquid conveying pipe; 33, water pump; 4, switching valve; 5, monitor; 51, swing rod; 52, tension sensor; 53, resistance component; 531, mounting roller; 532, blade; 533, guide; 54, pull rod; 6, controller; 7, one-way valve; 8, pretreatment assembly; 81, storage pool; 82, stirring roller; 821, paddle; 83, driving motor; 9, swing mechanism; 91, swing seat; 92, rotating motor. DETAILED DESCRIPTION​​​

[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0024] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0026] Please also refer to Figures 1 to 8 The negative pressure sizing device and negative pressure sizing method provided in this application are now described. The negative pressure sizing device is used to transfer slurry from a digestion device to a carbonization tower, and includes a sizing pump 1 for communicating with the digestion device; the negative pressure sizing device also includes a slurry transport channel 2, a negative pressure generating component 3, a switching valve 4, and a control component.

[0027] The slurry transport channel 2 is used to be vertically placed between the sizing pump 1 and the carbonization tower; the lower end of the slurry transport channel 2 is connected to the discharge end of the sizing pump 1, and the upper end thereof is used to be connected to the carbonization tower.

[0028] The negative pressure generating component 3 is in communication with the slurry transport channel 2 and is used to input the medium into the slurry transport channel 2 and to discharge the medium in the slurry transport channel 2 so that the slurry transport channel 2 is in a local negative pressure state.

[0029] The switching valve 4 is arranged on the slurry transport channel 2 and is used to connect the slurry transport channel 2 with the carbonization tower, or to connect the slurry transport channel 2 with the negative pressure generating component 3.

[0030] The control component includes a monitor 5 for monitoring the slurry level in the slurry transport channel 2, and a controller 6 electrically connected to the switching valve 4 and the slurry pump 1; the monitor 5 is electrically connected to the controller 6, and the monitor 5 can preset a height value.

[0031] When the slurry level in the slurry transport channel 2 reaches the preset value of the monitor 5, the medium in the slurry transport channel 2 is discharged; at the same time, the monitor 5 sends a signal to the controller 6, so that the controller 6 controls the switching valve 4 to switch to the state where the slurry transport channel 2 is connected to the carbonization tower, and controls the slurry pump 1 to start.

[0032] Working principle: The medium in the slurry transport channel 2 is discharged through the negative pressure generating component 3, and the slurry is pumped from the digestion device into the slurry transport channel 2 by using the air pressure difference; when the slurry accumulates to the specified liquid level, a mechanical or electronic signal is triggered, the path is automatically switched and the slurry pump 1 is started to achieve continuous and automatic slurrying.

[0033] In the embodiment of the present application, the slurry transport channel 2 is vertically placed between the slurry pump 1 and the carbonization tower, with the lower end connected to the discharge end of the slurry pump 1, and the upper end selectively connected to the carbonization tower or the negative pressure generating component 3 through the switching valve 4. The controller 6 initializes the preset liquid level height value of the monitor 5. The control component starts the negative pressure generating component 3, first inputs the medium into the slurry transport channel 2, and then discharges the medium, so that a local negative pressure state is formed in the slurry transport channel 2. At this time, the switching valve 4 is in the "slurry transport channel 2-negative pressure generating component 3" connection state, and the slurry pump 1 is closed. Under the action of negative pressure, the slurry in the digestion device is sucked into the slurry transport channel 2 through the inlet of the slurry pump 1, and the slurry rises along the vertical channel. The monitor 5 monitors the slurry level in the slurry transport channel 2 in real time. When the liquid level reaches the preset height value, the residual medium in the slurry transport channel 2 is completely emptied; at the same time, the monitor 5 sends a signal to the controller 6. After receiving the signal, the controller 6 controls the switching valve 4 to switch to the "slurry transport channel 2-carbonization tower" connection state, and starts the slurry pump 1 to pump the slurry in the slurry transport channel 2 into the carbonization tower.

[0034] Compared with the prior art, the negative pressure sizing device provided in the embodiment of the present application pre-lifts the slurry by negative pressure, thereby reducing the load at the start of the sizing pump 1 and reducing energy consumption; the vertical slurry transport channel 2 is combined with the negative pressure effect to improve the slurry delivery efficiency. By pre-lifting the slurry by negative pressure, a local negative pressure is formed in the slurry transport channel 2 before the sizing pump 1 is started. The slurry rises to the preset liquid level by itself under the action of negative pressure, reducing the instantaneous resistance of the pump body at the start. This design directly alleviates the problem of a sharp increase in the motor load of the traditional sizing pump 1 due to overcoming the resistance of high-viscosity slurry, reduces the risk of motor winding heating and insulation aging, avoids motor burnout failure, and reduces the frequency of equipment maintenance and replacement.

[0035] The negative pressure environment accelerates slurry flow, and the vertical slurry transport channel 2, combined with the medium emptying design, reduces the amount of viscous slurry and undigested particulate impurities remaining in the pipeline, reducing the risk of crystallization blockage. This solves the problem of production interruptions caused by blockage in traditional transportation, ensuring the continuous carbonization reaction and indirectly improving production efficiency.

[0036] Reduced equipment failure rates reduce maintenance downtime and spare parts replacement costs; automated liquid level monitoring and valve switching reduce manual intervention, further reducing labor costs. Compared to the traditional model that relies on a hard drive for the sizing pump, this solution achieves dual optimization of energy consumption and operation and maintenance costs through "negative pressure assistance + intelligent control."

[0037] In view of the high viscosity and low fluidity of lime slurry, the negative pressure pre-lift mechanism improves the smoothness of slurry transportation. Combined with the real-time feedback of the monitor 5 and the linkage adjustment of the controller 6, it ensures that the slurry enters the carbonization tower stably according to the preset parameters, avoids the influence of flow fluctuation on the carbonization reaction efficiency, and improves the quality stability of the target product.

[0038] In some embodiments, the negative pressure generating component 3 may be configured as follows: Figures 1 to 5 The structure shown, see Figures 1 to 5 The negative pressure generating component 3 includes a liquid storage tank 31 and a liquid infusion tube 32.

[0039] The liquid storage tank 31 has a hollow interior, and the interior of the liquid storage tank 31 is used to store a fluid medium; the medium is a liquid such as water.

[0040] One end of the liquid delivery tube 32 is connected to the liquid storage tank 31 through the water pump 33 , and the other end thereof is connected to the slurry delivery channel 2 through the switching valve 4 .

[0041] The water pump 33 is used to provide bidirectional suction to discharge the fluid medium in the liquid storage tank 31 into the slurry transport channel 2 through the liquid infusion pipe 32, or to discharge the fluid medium in the slurry transport channel 2 back to the liquid storage tank 31 through the liquid infusion pipe 32. The liquid storage tank 31 can be equipped with a filter device to prevent impurities from entering the slurry transport channel 2.

[0042] When the water pump 33 runs forward, the fluid medium in the liquid storage tank 31 is pumped into the slurry transport channel 2 through the infusion pipe 32; when the water pump 33 runs reversely, the medium in the slurry transport channel 2 is drawn back to the liquid storage tank 31, forming a local negative pressure; the medium can be recycled in a closed loop between the liquid storage tank 31 and the slurry transport channel 2.

[0043] The bidirectional water pump 33 realizes the two-step operation of "medium filling-emptying negative pressure" by switching the direction of water flow: when filling, the medium fills the slurry transport channel 2, and when emptying, it takes away the air in the channel to form low pressure, and uses the pressure difference to draw in the slurry.

[0044] By adopting the above technical means, the fluid medium (such as water) can be recycled, reducing the cost of consumables; the two-way water pump 33 integrates input / discharge functions to simplify the device structure; the sealing performance of the liquid medium is better than that of gas, and the negative pressure stability is higher.

[0045] In some embodiments, the monitor 5 may be configured as follows: Figures 1 to 8 The structure shown, see Figures 1 to 8 The slurry transport channel 2 has a mounting hole that penetrates along its radial direction, and the monitor 5 includes a swing rod 51 and a tension sensor 52.

[0046] The swing rod 51 is inserted into the mounting hole so that its two ends are respectively located on the inner and outer sides of the slurry transport channel 2; one end of the swing rod 51 located in the slurry transport channel 2 is connected to a resistance component 53, and the slurry in the slurry transport channel 2 can transmit a force to the resistance component 53 to cause the swing rod 51 to swing.

[0047] The tension sensor 52 is arranged outside the slurry transport channel 2, and a pull rod 54 is provided between the tension sensor 52 and the swing rod 51; one end of the pull rod 54 is connected to the tension sensor 52, and the other end thereof is hinged to the swing rod 51.

[0048] The tension sensor 52 can preset a tension value, and its signal output end is electrically connected to the controller 6 .

[0049] When the slurry contacts the resistance component 53, the slurry in the slurry transport channel 2 rises and pushes the resistance component 53, causing the swing rod 51 to swing around the mounting hole; the swing rod 51 pulls the tension sensor 52 through the pull rod 54, and sends a signal to the controller 6 when the tension reaches a preset value.

[0050] The impact force or viscosity of the slurry on the resistance member 53 is used to drive the mechanical swing, and the liquid level change is converted into a tension signal to achieve non-contact (indirect) liquid level monitoring.

[0051] By adopting the above technical means, the mechanical structure is corrosion-resistant and wear-resistant, and is suitable for high-viscosity or particle-containing slurries; there is no need to install electronic components in the channel, reducing the risk of failure; the sensitivity is adjustable (by adjusting the preset tension value) to adapt to different slurry characteristics.

[0052] In some embodiments, the resistance member 53 may be formed as follows: Figure 7 and Figure 8 The structure shown, see Figure 7 and Figure 8 , the resistance member 53 includes a mounting roller 531 and a plurality of blades 532 .

[0053] The mounting roller 531 is coaxially arranged in the slurry transport channel 2 , and the mounting roller 531 is connected to one end of the swing rod 51 in the slurry transport channel 2 .

[0054] The plurality of blades 532 are spaced apart along the circumference of the mounting roller 531 , and each blade 532 extends spirally along the axial direction of the mounting roller 531 .

[0055] The angle of the blade 532 can be designed to be adjustable to meet different flow rate requirements; the blade 532 can also be made of elastic material to avoid being stuck by hard objects.

[0056] When the slurry flows through the mounting roller 531 , it can push the spiral blade 532 through viscous force or impact force, thereby driving the swing rod 51 to swing and triggering the tension sensor 52 .

[0057] The design of the spiral blade 532 can increase the contact area with the slurry, use the tangential force of the slurry flow to drive the rotation, amplify the mechanical response of the swing rod 51, and improve the monitoring sensitivity.

[0058] By adopting the above technical means, the spiral blades 532 can disperse the impact force of the slurry and reduce local wear; compared with the flat resistance component 53, it is more sensitive to low liquid level changes.

[0059] In some embodiments, the mounting roller 531 may be configured as follows: Figure 7 and Figure 8 The structure shown, see Figure 7 and Figure 8 A guide member 533 is coaxially provided at the lower end of the mounting roller 531 , and the diameter of the guide member 533 gradually decreases from top to bottom.

[0060] When the slurry flows from bottom to top, it converges through the guide member 533 (with a larger diameter at the top and a smaller diameter at the bottom) and impacts the spiral blades 532 in a concentrated manner.

[0061] The conical guide 533 compresses the flow channel cross section, increases the slurry flow rate, and enhances the impact force on the blade 532, ensuring that the swing rod 51 can trigger a signal when the liquid level is low.

[0062] By adopting the above technical means, the slurry flow path can be optimized, monitoring delays caused by local eddies can be avoided, slurry can be prevented from depositing at the bottom of the mounting roller 531, and monitoring reliability under low liquid level conditions can be improved.

[0063] In some embodiments, the slurry transport channel 2 may be configured as follows: Figures 1 to 8 The structure shown, see Figures 1 to 8 A one-way valve 7 is provided between the slurry transport channel 2 and the slurry pump 1 to limit the slurry in the slurry transport channel 2 from returning to the slurry pump 1.

[0064] When the slurry pump 1 is turned on, the one-way valve 7 allows the slurry to flow from the pump to the slurry transport channel 2; when the pump is turned off or in the negative pressure stage, the one-way valve 7 blocks the reverse flow of the slurry.

[0065] The one-way valve 7 drives the valve core through a spring or gravity, allowing the fluid to flow in only one direction, thereby preventing the slurry in the slurry transport channel 2 from flowing back into the slurry pump 1 during the negative pressure stage.

[0066] The one-way valve 7 can be an electromagnetic one-way valve 7, which is linked with the controller 6 to achieve active cutoff; or a pressure feedback function can be added to the one-way valve 7 to monitor whether the one-way valve 7 is leaking.

[0067] By adopting the above technical solution, it is possible to effectively avoid pipeline blockage or pump body wear caused by slurry backflow; maintain the stability of negative pressure in the slurry transport channel 2 to ensure slurry extraction efficiency; simplify the control system logic, and eliminate the need for additional valves to block backflow.

[0068] In some embodiments, the negative pressure sizing device can be used as follows Figure 1 and Figure 3 The structure shown, see Figure 1 and Figure 3 The pretreatment component 8 is used to communicate with the digestion device to accommodate the slurry discharged from the digestion device and pretreat the slurry; the pretreatment component 8 is also connected to the slurry pump 1 to discharge the slurry to the slurry pump 1.

[0069] The pretreatment component 8 is connected to the digestion device, receives and temporarily stores the slurry discharged from the digestion device; performs pretreatment operations such as stirring and mixing on the slurry stored in the pretreatment component 8; the pretreated slurry is transported to the sizing pump 1 through a pipeline and enters the subsequent sizing process.

[0070] By setting up an independent pretreatment link, the slurry is physically or chemically treated (such as stirring evenly, removing impurities, adjusting concentration, etc.) before entering the slurry transport channel 2 to optimize the slurry properties and avoid pipeline blockage or decreased sizing efficiency due to uneven slurry or impurities.

[0071] By adopting the above technical solution, the uniformity of the slurry can be effectively improved, and the local concentration deviation in the subsequent carbonization reaction can be reduced; the wear of impurities on equipment (such as slurry pump 1 and slurry transport channel 2) can be reduced, and the service life can be extended; and a variety of pretreatment functions (such as heating, filtration, and pH adjustment) can be flexibly integrated to adapt to different process requirements.

[0072] In some embodiments, the pre-processing component 8 may be used as follows: Figure 1 and Figure 3 The structure shown, see Figure 1 and Figure 3 The pre-treatment component 8 includes a storage tank 81 and a stirring roller 82.

[0073] The storage tank 81 is used to communicate with the digestion device to store the slurry discharged from the digestion device; the storage tank 81 is also connected to the slurry pump 1 to discharge the slurry to the slurry pump 1.

[0074] The stirring roller 82 is arranged in the storage tank 81, and the stirring roller 82 has the freedom to rotate with the vertical direction as the axis; the stirring roller 82 has multiple groups of blades 821 arranged at intervals along its axial direction, and each group of blades 821 includes multiple blades 821 arranged at intervals along the circumference of the stirring roller 82; the stirring roller 82 is connected to the swing mechanism 9 to make the stirring roller 82 swing in the horizontal direction.

[0075] The power output shaft of the drive motor 83 is in transmission connection with the stirring roller 82 so that the stirring roller 82 rotates around its axis to stir the slurry in the storage tank 81 .

[0076] The slurry discharged from the digestion device enters the storage tank 81, and the driving motor 83 drives the stirring roller 82 to rotate around its own axis, stirring the slurry through multiple sets of propeller blades 821; the stirring roller 82 is driven by the swing mechanism 9 to swing back and forth in the horizontal direction, thereby expanding the stirring range; the evenly stirred slurry flows from the bottom of the storage tank 81 into the slurry pump 1.

[0077] By adopting the above technical solution and combining the compound motion of "rotational stirring + horizontal swing": the rotation of the stirring roller 82 shears the slurry through the paddle 821 to break the stratification; the horizontal swing makes the stirring area cover the entire storage tank 81, avoiding local dead corners, and realizing three-dimensional uniform mixing of the slurry.

[0078] In some embodiments, the swing mechanism 9 can be configured as follows: Figures 1 to 4 The structure shown, see Figures 1 to 4 The swing mechanism 9 includes a swing seat 91 and a drive motor 83.

[0079] One end of the swing seat 91 is hinged to the material storage tank 81 , and the other end is rotatably connected to the stirring roller 82 ; the hinge axis of the swing seat 91 is parallel to the axis of the stirring roller 82 .

[0080] The power output shaft of the rotating motor 92 is in transmission connection with the swing seat 91 so that the swing seat 91 drives the stirring roller 82 to swing in the horizontal direction.

[0081] The rotating motor 92 is started, and its power output shaft drives the swing seat 91 to rotate around the hinge axis. The swing seat 91 drives the stirring roller 82 connected to it to swing left and right in the horizontal direction with the hinge point as the center; the swing amplitude of the stirring roller 82 can be controlled by limiting the forward and reverse angles of the rotating motor 92.

[0082] By adopting the above technical solution, the swing angle can be precisely controlled by the motor parameters to adapt to storage tanks 81 of different sizes; and coordinated with the rotational movement of the stirring roller 82 to eliminate the stirring blind spots in the corners of the storage tank 81.

[0083] The technical solution adopted in this application also provides a negative pressure sizing method, which is based on the negative pressure sizing device of any of the above contents, comprising the following steps: A. The slurry pump 1 is in a closed state, and the switching valve 4 is controlled by the controller 6 to operate, and the switching valve 4 is switched to a state where the slurry transport channel 2 is connected to the negative pressure generating component 3.

[0084] B. The negative pressure generating component 3 is started by the controller 6 to input the medium into the slurry transport channel 2.

[0085] C. The negative pressure generating component 3 is controlled by the controller 6 to run in reverse, so as to discharge the medium inside the slurry transport channel 2 and put the slurry transport channel 2 into a local negative pressure state; the slurry transport channel 2 in the local negative pressure state draws the slurry in the digestion device into the interior of the slurry transport channel 2.

[0086] D. When the monitor 5 detects that the liquid level of the slurry in the slurry transport channel 2 reaches the preset value, the monitor 5 sends a signal to the controller 6, and the controller 6 controls the switching valve 4 to switch to the state where the slurry transport channel 2 is connected to the carbonization tower; at the same time, the controller 6 controls the slurry pump 1 to start.

[0087] This method realizes the automated and low-energy transportation of slurry through the cyclic process of "medium filling-emptying negative pressure-liquid level triggering-switching transportation". The core is the coordinated control of negative pressure pre-pumping and mechanical triggering.

[0088] By adopting the above technical means, the entire process can be automated and the intensity of manual operation can be reduced; and the negative pressure slurry extraction is combined with pumping, taking into account the combination of the sizing pump 1 and pumping, thereby improving the starting efficiency and transportation stability of the sizing pump 1.

[0089] The beneficial effects of the negative pressure sizing method provided in this embodiment are the same as those of the aforementioned negative pressure sizing device, and will not be repeated here.

[0090] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A negative pressure sizing device for transferring slurry from the digestion device to the carbonization tower, comprising a sizing pump for communicating with the digestion device; characterized in that: The negative pressure sizing device also includes: a slurry transport channel, arranged vertically between the sizing pump and the carbonization tower; the lower end of the slurry transport channel is connected to the discharge end of the sizing pump, and the upper end thereof is connected to the carbonization tower; a negative pressure generating component, connected to the slurry transport channel, for inputting a medium into the slurry transport channel and for discharging the medium in the slurry transport channel so as to place the slurry transport channel in a local negative pressure state; a switching valve, provided on the slurry transport channel, for connecting the slurry transport channel with the carbonization tower, or connecting the slurry transport channel with the negative pressure generating component; and A control component, comprising a monitor for monitoring the slurry level in the slurry transport channel, and a controller electrically connected to the switching valve and the slurry pump; the monitor is electrically connected to the controller, and the monitor is capable of presetting a height value; When the slurry level in the slurry transport channel reaches the preset value of the monitor, the medium in the slurry transport channel is drained; at the same time, the monitor sends a signal to the controller, so that the controller controls the switching valve to switch to the state where the slurry transport channel is connected to the carbonization tower, and controls the slurry pump to start.

2. The negative pressure sizing device according to claim 1, characterized in that: The negative pressure generating component comprises: A liquid storage tank for storing fluid medium; a liquid infusion tube, one end of which is connected to the liquid storage tank via a water pump, and the other end of which is connected to the slurry transport channel via the switching valve; The water pump is used to provide bidirectional suction so that the fluid medium in the liquid storage tank is discharged into the slurry transport channel through the liquid infusion tube, or the fluid medium in the slurry transport channel is discharged back to the liquid storage tank through the liquid infusion tube.

3. The negative pressure sizing device according to claim 1, characterized in that: The slurry transport channel has a mounting hole extending radially therethrough, and the monitor includes: a swing rod inserted into the mounting hole so that its two ends are respectively located at the inner and outer sides of the slurry transport channel; one end of the swing rod located in the slurry transport channel is connected to a resistance member, and the slurry in the slurry transport channel can transmit a force to the resistance member to cause the swing rod to swing; and A tension sensor is arranged outside the slurry transport channel, and a pull rod is provided between the tension sensor and the swing rod; one end of the pull rod is connected to the tension sensor, and the other end thereof is hinged to the swing rod; The tension sensor can preset a tension value, and its signal output end is electrically connected to the controller.

4. The negative pressure sizing device according to claim 3, characterized in that: The resistance member comprises: a mounting roller, coaxially disposed in the slurry transport channel, and connected to one end of the swing rod in the slurry transport channel; and A plurality of blades are arranged at intervals along the circumference of the installation roller, and each of the blades extends spirally along the axial direction of the installation roller.

5. The negative pressure sizing device according to claim 4, characterized in that: A guide piece is coaxially provided at the lower end of the installation roller, and the diameter of the guide piece gradually decreases from top to bottom.

6. The negative pressure sizing device according to claim 1, characterized in that: A one-way valve is provided between the slurry transport channel and the slurry pump to limit the slurry in the slurry transport channel from returning to the slurry pump.

7. The negative pressure sizing device according to any one of claims 1 to 6, characterized in that: The negative pressure sizing device also includes: The pretreatment component is used to communicate with the digestion device to accommodate the slurry discharged from the digestion device and pretreat the slurry; the pretreatment component is also communicated with the sizing pump to discharge the slurry to the sizing pump.

8. The negative pressure sizing device according to claim 7, characterized in that: The pre-processing component includes: a storage tank, connected to the digestion device to store the slurry discharged from the digestion device; the storage tank is also connected to the sizing pump to discharge the slurry to the sizing pump; and A stirring roller is disposed in the storage tank and has the freedom to rotate with the vertical direction as the axis; the stirring roller has multiple groups of blades arranged at intervals along the axial direction thereof, and each group of blades includes multiple blades arranged at intervals along the circumference of the stirring roller; the stirring roller is connected to a swing mechanism to swing the stirring roller in the horizontal direction; and The drive motor has a power output shaft that is in transmission connection with the stirring roller so that the stirring roller rotates around its axis to stir the slurry in the storage tank.

9. The negative pressure sizing device according to claim 8, characterized in that: The swing mechanism comprises: A swing seat, one end of which is hinged to the material storage tank and the other end of which is rotatably connected to the stirring roller; the hinge axis of the swing seat is parallel to the axis of the stirring roller; and The power output shaft of the rotating motor is connected with the swing seat in a transmission manner so that the swing seat drives the stirring roller to swing in a horizontal direction.

10. A negative pressure sizing method, based on the negative pressure sizing device according to any one of claims 1 to 9, characterized in that: The following steps are involved: A. The sizing pump is turned off, and the controller controls the switching valve to operate, switching the switching valve to a state where the slurry transport channel is connected to the negative pressure generating component; B. controlling the negative pressure generating component to start by the controller to input the medium into the slurry transport channel; C. controlling the negative pressure generating assembly to operate in reverse by the controller to discharge the medium in the slurry transport channel, so that the slurry transport channel is in a local negative pressure state; the slurry transport channel in the local negative pressure state draws the slurry in the digestion device into the slurry transport channel; D. When the monitor detects that the liquid level of the slurry in the slurry transport channel reaches a preset value, the monitor sends a signal to the controller, and the controller controls the switching valve to switch to a state where the slurry transport channel is connected to the carbonization tower; at the same time, the controller controls the slurry pump to start.

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