Vacuum dewatering system for paper-making industry

Abstract

The invention relates to the technical field of papermaking, in particular to a paper-making industry vacuum dehydration system which comprises a water storage tank, a base is mounted at the bottom of the water storage tank, an air inlet pipe and an air outlet pipe are mounted at the top of the water storage tank, and the air outlet pipe is communicated with a negative pressure unit through an air conveying pipe; the side surface of the water storage tank is provided with a liquid level meter; the bottom of the water storage tank is fixedly communicated with a pipeline provided with a water pump; the water storage tank is internally provided with a separation unit, the separation unit is communicated with the air inlet pipe, the separation unit is internally provided with a secondary separation part, the separation unit is connected with the secondary separation part in series, the secondary separation part is communicated with the air outlet pipe, and the separation unit and the secondary separation part are sequentially used for realizing first-time air-water separation and second-time air-water separation. Through a hierarchical gas-water separation structure, water in airflow is deeply removed, the negative pressure unit is dynamically adjusted through water quantity monitoring, and energy consumption and damage to equipment can be reduced to the maximum extent while the dewatering requirement of a papermaking production line is met.

Description

Technical Field

[0001] The invention relates to the technical field of papermaking industry, in particular to a vacuum dehydration system for papermaking industry. Background Art

[0002] The papermaking vacuum dehydration system is a crucial link in the papermaking industry, which is directly related to the quality and production efficiency of paper. The vacuum dehydration system mainly uses the negative pressure environment generated by the vacuum pump to extract the moisture from the pulp to achieve the purpose of dehydration.

[0003] The vacuum dehydration system has the advantages of high efficiency dehydration, improved product quality, energy saving and environmental protection, wide application range and high degree of automation. However, the dehydration effect of the vacuum dehydration system is affected by the properties of the material. Factors such as the particle size, viscosity, and water content of the material will affect the dehydration efficiency and product quality. Therefore, when processing materials of different properties, the system needs to be adjusted and optimized accordingly, and there are high technical requirements for operators.

[0004] In addition, the equipment of the vacuum dehydration system is in a humid working environment for a long time, which will seriously affect its service life. Regular maintenance and servicing are required to ensure its normal operation, which increases the maintenance cost of the equipment, increases the workload of technicians, and reduces work efficiency. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a vacuum dehydration system for papermaking, which realizes high separation of gas and water by adopting a multi-stage separation unit, thereby solving the problems of high equipment maintenance cost and low working efficiency; by detecting the gas-water separation degree of the separation unit, the dehydration air pressure is dynamically adjusted, thereby solving the problem of high difficulty in equipment adjustment and optimization, which is specifically achieved through the following technical solutions: The invention discloses a vacuum dehydration system for papermaking industry, comprising a water storage tank, a base is installed at the bottom of the water storage tank, and an air inlet pipe is installed at the top of the water storage tank.

[0006] An air outlet pipe is installed on the top of the water storage tank, and the air outlet pipe is fixedly connected to the inlet of the negative pressure unit through an air supply pipe. The negative pressure unit is installed inside the installation box, and a control cabinet is installed on the side of the installation box. The control cabinet is used to control and adjust the water pump and the negative pressure unit.

[0007] A liquid level gauge is installed on the side of the water storage tank, and the bottom of the water storage tank is fixedly connected to a pipeline installed with a water pump.

[0008] A separation unit is installed inside the water storage tank, and the separation unit is connected to the air inlet pipe. A secondary separation part is installed inside the separation unit, and the separation unit and the secondary separation part are connected in series. The secondary separation part is connected to the air outlet pipe. The separation unit and the secondary separation part are used to realize the first gas-water separation and the second gas-water separation respectively.

[0009] Preferably, the separation unit includes an outer cylinder, the air inlet pipe passes through the water storage tank and is fixedly connected to the outer cylinder, an inner cylinder is coaxially fixedly installed inside the outer cylinder, an annular channel is formed between the outer cylinder and the inner cylinder, a spiral plate is fixedly installed in the annular channel, and the top end of the spiral plate is fixed to the baffle.

[0010] The inner surface of the outer cylinder is evenly and vertically provided with a plurality of drainage grooves, and the drainage grooves penetrate the connection between the spiral plate and the outer cylinder up and down.

[0011] The bottom of the outer cylinder is coaxially fixed to the outer side of the first water storage tank, and an annular gap is provided between the first water storage tank and the inner cylinder.

[0012] The bottom of the first water storage tank is fixedly connected to the first solenoid valve, and the side of the first water storage tank is fixedly connected to the first overflow pipe. A first sensor is installed on the first overflow pipe, and the probe of the first sensor passes through the side wall of the first overflow pipe and is arranged in the first overflow pipe.

[0013] Preferably, the secondary separation part comprises a conical cylinder, the inner side of the first water storage tank is fixed to the conical cylinder, the bottom of the conical cylinder is fixed to the second water storage tank, and the bottom of the second water storage tank is fixedly connected to the second solenoid valve.

[0014] The side surface of the second water storage tank is fixedly connected to the second overflow pipe, and a second sensor is installed on the second overflow pipe. The probe of the second sensor passes through the side wall of the second overflow pipe and is arranged in the second overflow pipe.

[0015] The top of the inner cylinder is fixed to the outer side of the circulating top, the inner side of the circulating top is fixed to the annular grid, a mounting shaft is fixed to the bottom of the annular grid, a plurality of second annular plates are mounted on the mounting shaft, a plurality of first annular plates are fixed to the inner surface of the inner cylinder, and the first annular plates are spaced apart from the second annular plates.

[0016] Preferably, the negative pressure unit includes a first shunt pipe, a plurality of the first shunt pipes are fixedly connected to the air supply pipe, the first shunt pipes are fixedly connected to the air inlet pipe, and the air inlet pipe is fixedly connected to the inlet of the vacuum pump.

[0017] The outlet of the vacuum pump is fixedly connected to the air outlet pipe, the air outlet pipe is fixedly connected to the second shunt pipe, a plurality of the second shunt pipes are fixedly connected to the exhaust pipe, and the exhaust pipe is installed on the top of the installation box.

[0018] Preferably, the connection between the air inlet pipe and the outer cylinder is arranged along the tangential direction of the outer cylinder.

[0019] Preferably, the baffle is sealed and installed in the annular channel formed by the outer tube and the inner tube, the baffle is arranged along the radial direction of the outer tube, and the baffle is located in the opposite direction of the flow of the air-water mixture at the connection between the air inlet pipe and the outer tube.

[0020] Preferably, the first water storage tank is an annular cylindrical structure, and the bottom of the first water storage tank is configured to be in an arc shape.

[0021] Preferably, the first annular plate is a conical plate, and its diameter gradually decreases from top to bottom, the second annular plate is a conical plate, and its diameter gradually increases from top to bottom, and the inner ring diameter of the first annular plate is smaller than the outer ring diameter of the second annular plate.

[0022] Preferably, the diameter of the conical cylinder gradually decreases from top to bottom, and the inner ring diameter of the first annular plate is smaller than the outer ring diameter of the conical cylinder.

[0023] Preferably, a structure consisting of the first diverter pipe, the air inlet pipe, the vacuum pump, the air outlet pipe and the second diverter pipe is installed in multiple groups inside the installation box.

[0024] After adopting the above technical solution, the beneficial effects of the present invention are: 1. Through the structure of stratified gas-water separation, the moisture in the airflow is deeply removed, effectively reducing the gas humidity, thereby reducing damage to equipment such as vacuum pumps and effectively extending the service life of the system.

[0025] 2. By comparing the amount of water separated from the air-water separation mechanisms at the front and rear levels, the negative pressure unit is dynamically adjusted to control the air flow rate of the dehydration system within a reasonable range. While meeting the dehydration needs of the paper production line, it can minimize energy consumption and equipment damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a three-dimensional diagram of a vacuum dewatering system for the papermaking industry; Figure 2 It is a front view of some parts of a vacuum dehydration system for papermaking; Figure 3 for Figure 2 A partial enlarged view of Figure 4 It is a structural schematic diagram of a negative pressure unit; Figure 5 for Figure 3 A partial cutaway diagram of the structure; Figure 6 for Figure 5 The main view of some parts in the middle; Figure 7 For along Figure 6 Sectional view along line AA; Figure 8 for Figure 6 A front cross-sectional view of Fig. 9 for Figure 8 A partial enlarged schematic diagram of .

[0028] Description of reference numerals: 101- water storage tank, 102- base, 103- air inlet pipe, 104- air outlet pipe, 105- air transmission pipe, 106- installation box, 107- control cabinet, 108- liquid level meter, 109- water pump; 200-negative pressure unit, 201-first shunt pipe, 202-air inlet pipe, 203-vacuum pump, 204-air outlet pipe, 205-second shunt pipe, 206-exhaust pipe; 300-separation unit, 301-outer cylinder, 302-baffle, 303-inner cylinder, 304-spiral plate, 305-drainage groove, 306-first water storage tank, 307-first solenoid valve, 308-first overflow pipe, 309-first sensor, 310-second separation part, 311-conical cylinder, 312-second water storage tank, 313-second solenoid valve, 314-second overflow pipe, 315-second sensor, 316-circulation top, 317-annular grid, 318-first annular plate, 319-second annular plate. DETAILED DESCRIPTION

[0029] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention.

[0030] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the present invention. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation, connection" should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection or an integral connection; it can be directly connected or indirectly connected. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0031] The embodiment of the present invention provides a vacuum dehydration system for papermaking, see Figures 1 to 9 The dehydration system includes a water tank 101, a base 102 is fixedly installed at the bottom of the water tank 101 for maintaining the stability of the water tank 101, an air inlet pipe 103 is fixedly installed on the left side of the top of the water tank 101, and the air-water mixture on the paper production line is input into the water tank 101 through the air inlet pipe 103.

[0032] An air outlet pipe 104 is also fixedly installed on the top of the water tank 101. The air outlet pipe 104 is fixedly connected to the inlet of the negative pressure unit 200 installed inside the installation box 106 through the air supply pipe 105. The negative pressure unit 200 is used to provide negative pressure, thereby transporting the gas-water mixture on the paper production line to the inside of the water tank 101 through the air inlet pipe 103.

[0033] A separation unit 300 is also fixedly installed inside the water tank 101, and a secondary separation part 310 is fixedly installed inside the separation unit 300. The separation unit 300 and the secondary separation part 310 are used to separate the gas-water mixture, store the liquid inside the water tank 101, and discharge the gas to the outside through the outlet pipe 104, the gas supply pipe 105 and the negative pressure unit 200.

[0034] For further explanation of the present invention, see Figure 1 , Figure 2 , Figure 3 A liquid level meter 108 is fixedly installed on the side of the water tank 101 for monitoring the liquid level inside the water tank 101. The bottom of the water tank 101 is fixedly connected to a pipeline on which a water pump 109 is installed. When the liquid level in the water tank 101 reaches a first preset height, the water pump 109 is started to pump the liquid in the water tank 101 outwards, and the water pump 109 is stopped until the liquid level in the water tank 101 reaches a second preset height.

[0035] The above structure controls the liquid level in the water tank 101 within a certain range, and discharges the liquid stored in the water tank 101 intermittently, thereby providing a prerequisite for the normal operation of the separation unit 300 installed in the water tank 101.

[0036] A control cabinet 107 is fixedly installed on the side of the installation box 106. The control cabinet 107 is used to control and adjust the water pump 109 and the negative pressure unit 200, thereby achieving continuous and efficient operation of the dehydration system.

[0037] See also Figure 2 , Figure 4 The negative pressure unit 200 includes a first diversion pipe 201, and several first diversion pipes 201 are fixedly connected to the air supply pipe 105 to divert the wind in the air supply pipe 105. The bottom end of the first diversion pipe 201 is fixedly connected to the first end of the air inlet pipe 202, and the second end of the air inlet pipe 202 is fixedly connected to the inlet of the vacuum pump 203. The outlet of the vacuum pump 203 is fixedly connected to the first end of the air outlet pipe 204, and the second end of the air outlet pipe 204 is fixedly connected to the second diversion pipe 205. Several second diversion pipes 205 are fixedly connected to the exhaust pipe 206. The exhaust pipe 206 is installed on the top of the installation box 106, and the exhaust pipe 206 is connected to the outside.

[0038] Among them, a structure consisting of a first diversion pipe 201, an air inlet pipe 202, a vacuum pump 203, an air outlet pipe 204, and a second diversion pipe 205 is installed in multiple groups inside the installation box 106. The purpose is: when dehydrating pulp, adaptive adjustments are made according to factors such as different pulp particle sizes, viscosities, and water contents to meet the use requirements of different working conditions. The specific adjustment method can be power adjustment of a single vacuum pump 203, and the number of starts of the vacuum pump 203 can also be controlled, thereby realizing the overall adjustment of the air volume in the air supply pipe 105.

[0039] As a further explanation of the above embodiments, see Figure 5 to Figure 7 The separation unit 300 includes an outer tube 301, and the air inlet pipe 103 passes through the top of the water storage tank 101 and is fixedly connected to the top of the side of the outer tube 301. The connection between the air inlet pipe 103 and the outer tube 301 is arranged along the tangential direction of the outer tube 301, so that the gas-water mixture entering the outer tube 301 through the air inlet pipe 103 can easily flow along the circumferential direction of the outer tube 301.

[0040] The inner cylinder 303 is coaxially fixedly installed inside the outer cylinder 301, and an annular channel is formed between the outer cylinder 301 and the inner cylinder 303. A spiral plate 304 is fixedly installed in the annular channel. The top end of the spiral plate 304 is fixed to the baffle 302. The baffle 302 is sealingly installed in the annular channel formed by the outer cylinder 301 and the inner cylinder 303. The baffle 302 is arranged along the radial direction of the outer cylinder 301, and the baffle 302 is located at the connection between the intake pipe 103 and the outer cylinder 301, and is installed in the opposite direction of the flow of the gas-water mixture.

[0041] This structure first allows the gas-water mixture entering the outer cylinder 301 through the air inlet pipe 103 to smoothly enter the outer cylinder 301 along the tangential direction of the outer cylinder 301, and under the blocking effect of the baffle 302 and the guiding effect of the spiral plate 304, the gas-water mixture entering the outer cylinder 301 flows downward in a single direction in the annular channel formed by the outer cylinder 301 and the inner cylinder 303.

[0042] The flow mode of the above-mentioned gas-water mixture can effectively realize preliminary gas-water separation. The principle is: the gas carries water droplets through the air inlet pipe 103 along the tangential direction into the outer cylinder 301, and flows in a circular spiral downward manner. In this process, the water droplets carried in the gas will be affected by centrifugal force. Under the action of centrifugal force, the water droplets tend to move along the radial direction of the outer cylinder 301 toward the periphery of the outer cylinder 301, so that the water droplets eventually adhere to the inner surface of the outer cylinder 301. The water droplets adhered to the inner surface of the outer cylinder 301 are difficult to continue to be blown by the gas under the action of surface tension and adhesion, thereby achieving the effect of gas-water separation.

[0043] Among them, a number of drainage grooves 305 are evenly and vertically opened on the inner surface of the outer cylinder 301, and the drainage grooves 305 penetrate the connection between the spiral plate 304 and the outer cylinder 301 from top to bottom, so that water droplets adhering to the inner surface of the outer cylinder 301 can flow along the drainage grooves 305 to the bottom of the outer cylinder 301 under the action of gravity, which is convenient for storage and treatment.

[0044] For further explanation of this embodiment, see Figure 8 A first water storage tank 306 is fixedly installed at the bottom of the outer cylinder 301. The first water storage tank 306 is an annular cylindrical structure. The outer side of the first water storage tank 306 is coaxially sealed and fixed with the bottom of the outer cylinder 301. A gap is left between the inner side of the first water storage tank 306 and the inner cylinder 303 to facilitate the outflow of gas between the outer cylinder 301 and the inner cylinder 303.

[0045] The bottom of the first water storage tank 306 is configured to be arc-shaped, so that the gas between the outer cylinder 301 and the inner cylinder 303 can flow out more smoothly.

[0046] The bottom of the first water storage tank 306 is fixedly connected to the first solenoid valve 307, the side of the first water storage tank 306 is fixedly connected to the first overflow pipe 308, the side of the first overflow pipe 308 is fixedly installed with a first sensor 309, and the probe of the first sensor 309 is sealed and passes through the side wall of the first overflow pipe 308 and is arranged inside the first overflow pipe 308.

[0047] The water flowing to the bottom of the outer cylinder 301 through the drainage groove 305 gathers at the bottom of the first water storage tank 306. The opening and closing of the first solenoid valve 307 can smoothly discharge the water in the first water storage tank 306 to the water storage tank 101. The first overflow pipe 308 opened on the side of the first water storage tank 306 can limit the liquid level in the first water storage tank 306. When the liquid level in the first water storage tank 306 reaches the height position of the first overflow pipe 308, it will flow into the first overflow pipe 308, and then trigger the first sensor 309 installed on the side of the first overflow pipe 308, so as to know that the liquid level in the first water storage tank 306 has reached the height position of the first overflow pipe 308.

[0048] Among them, the first overflow pipe 308 is sealed at one end away from the first water storage tank 306 to prevent the gas in the water storage tank 101 from entering the first water storage tank 306 through the first overflow pipe 308, thereby affecting the airflow direction inside the separation unit 300.

[0049] The purpose of the above structure is to discharge the liquid in the first water tank 306 into the water tank 101 through the first solenoid valve 307. When the liquid level meter 108 detects that the liquid level in the water tank 101 no longer rises, it proves that the liquid in the first water tank 306 is empty, and then the first solenoid valve 307 is closed. When the first sensor 309 detects that there is liquid in the first overflow pipe 308, the time difference from the closing of the first solenoid valve 307 to the presence of liquid in the first overflow pipe 308 can be obtained, so that the dehydration efficiency between the outer cylinder 301 and the inner cylinder 303 within the time difference can be calculated.

[0050] Among them, the liquid level in the water storage tank 101 is always lower than the outlet of the first solenoid valve 307, that is, the first preset height is lower than the outlet of the first solenoid valve 307, to prevent the liquid in the first water storage tank 306 from automatically flowing out when the first solenoid valve 307 is opened.

[0051] As a further explanation of the above embodiments, see Figure 8 , Fig. 9 A secondary separation part 310 is fixedly installed inside the inner cylinder 303, and the secondary separation part 310 includes a conical cylinder 311. The inner side of the first water storage tank 306 is fixed to the outer surface of the conical cylinder 311. The diameter of the conical cylinder 311 gradually decreases from top to bottom. The bottom of the conical cylinder 311 is fixed to the second water storage tank 312. The bottom of the second water storage tank 312 is fixedly connected to the second solenoid valve 313. The side of the second water storage tank 312 is fixedly connected to the second overflow pipe 314. A second sensor 315 is fixedly installed on the side of the second overflow pipe 314. The probe of the second sensor 315 passes through the side wall of the second overflow pipe 314 and is arranged inside the second overflow pipe 314.

[0052] The top of the inner cylinder 303 is fixed to the outer side of the circulating top 316. The circulating top 316 is an annular cylinder. The top of the circulating top 316 is arc-shaped to facilitate the flow of gas. The inner side of the circulating top 316 is coaxially fixed to the top of the annular grid 317. The bottom of the annular grid 317 is coaxially fixed to the mounting shaft. A plurality of second annular plates 319 are fixed on the mounting shaft. The second annular plates 319 are conical plates, and the diameter gradually increases from top to bottom.

[0053] A plurality of first annular plates 318 are evenly fixed on the inner surface of the inner cylinder 303 along the height direction. The first annular plates 318 and the second annular plates 319 are spaced apart. The first annular plates 318 are conical plates, and their diameters gradually increase from bottom to top. The inner diameter of the first annular plate 318 is smaller than the outer diameter of the second annular plate 319.

[0054] Among them, the inner circle diameter of the first annular plate 318 is smaller than the outer circle diameter of the conical cylinder 311, so that the water droplets in the inner cylinder 303 can flow downward step by step, and finally drip into the conical cylinder 311 smoothly, thereby converging inside the second water storage tank 312.

[0055] Among them, the second overflow pipe 314 is sealed at one end away from the second water storage tank 312 to prevent the gas in the water storage tank 101 from entering the second water storage tank 312 through the second overflow pipe 314, thereby affecting the airflow direction inside the separation unit 300.

[0056] Through the above structure, the mixture that has achieved the first gas-water separation is further separated into gas and water, wherein the flow direction of the gas is as follows: Fig. 9 In the direction indicated by the middle arrow, the water droplets mixed in the gas contact the side walls of the first annular plate 318 and the second annular plate 319 in turn through a return route. Due to the change in the direction of the airflow, the water droplets carried by the airflow adhere to the surfaces of the first annular plate 318 and the second annular plate 319 under the action of inertia, and slide downward under the action of gravity. After the gas passes through the annular top 316 at the top of the inner tube 303, it is discharged to the outside through the gap of the annular grid 317 to the outlet pipe 104.

[0057] In addition, the flow direction of the airflow in the inner cylinder 303 is from bottom to top, which itself facilitates the separation of air and water, because the water droplets mixed in the airflow tend to move downward under the action of gravity.

[0058] Based on the above principle, the gas-water separation effect in the inner cylinder 303 is further enhanced, and the humidity of the gas after water separation is effectively reduced. When the gas enters the negative pressure unit 200 through the outlet pipe 104, the damage to the vacuum pump 203 in the negative pressure unit 200 is minimized, thereby effectively extending the service life of the equipment.

[0059] In addition, the structure formed by the conical cylinder 311 , the second water storage tank 312 , the second solenoid valve 313 , the second overflow pipe 314 and the second sensor 315 is used to collect the liquid in the inner cylinder 303 , and can drain the liquid through the second solenoid valve 313 .

[0060] After the liquid in the second water storage tank 312 is emptied, the second solenoid valve 313 is immediately closed to collect the liquid in the inner cylinder 303 until the second sensor 315 detects that there is liquid in the second overflow pipe 314. At this time, the time difference from the closing of the second solenoid valve 313 to the presence of liquid in the second overflow pipe 314 is recorded, so that the dehydration efficiency inside the inner cylinder 303 within the time difference can be calculated.

[0061] By comparing the dehydration amounts per unit time on the inner and outer sides of the inner drum 303 , the difference in dehydration effects on the inner and outer sides of the inner drum 303 can be known.

[0062] During the actual dehydration process, the power of the vacuum pump 203 will be adjusted in real time according to the moisture content of the pulp. When the moisture content of the pulp at the dehydration end is high, the wind resistance is large. At this time, the wind force is small, and the vacuum pump 203 increases its power to meet the dehydration demand. At this time, the wind force will increase synchronously, causing the number of water droplets mixed in the gas-water mixture on the inner side of the inner tube 303 located in the rear section to increase, thereby shortening the time difference from the closing of the second solenoid valve 313 to the presence of liquid in the second overflow pipe 314.

[0063] In addition, the rationality of the power adjustment of the vacuum pump 203 and the energy consumption of the whole machine must also be considered. While meeting the above-mentioned dehydration end requirements, the power increase value of the vacuum pump 203 must be reasonably controlled to avoid inefficient work of the vacuum pump 203 caused by excessive wind force.

[0064] Moreover, excessive wind force may affect the air-water separation effect inside the inner tube 303 , causing water droplets mixed in the airflow that are not completely separated to enter the vacuum pump 203 , thus affecting the service life of the vacuum pump 203 .

[0065] On the contrary, when the moisture content of the pulp at the dewatering end is low, the wind resistance is small, and the wind force is large at this time. The vacuum pump 203 reduces its power to reduce energy consumption. At this time, the wind force will decrease synchronously, causing the number of water droplets mixed in the gas-water mixture between the outer cylinder 301 and the inner cylinder 303 located in the front section to increase, thereby shortening the time difference from the closing of the first solenoid valve 307 to the presence of liquid in the first overflow pipe 308. However, it should be noted that at this time, the power reduction of the vacuum pump 203 must be based on the premise that the normal operation of the dewatering end is not affected.

[0066] Therefore, it is necessary to dynamically adjust the negative pressure unit 200 to control the wind force passing through the inner and outer sides of the inner tube 303 within an appropriate range. In this embodiment, the accumulation speed of water on the inner and outer sides of the inner tube 303 can be respectively known through the first sensor 309 and the second sensor 315. It is only necessary to adaptively adjust the height positions of the first overflow pipe 308 and the second overflow pipe 314 in conjunction with technical personnel in this field, which can serve as a reference for wind force adjustment of the negative pressure unit 200.

[0067] For example, after calculation and adjustment by technical personnel, the positions of the first overflow pipe 308 and the second overflow pipe 314 are determined, so that when the first solenoid valve 307 and the second solenoid valve 313 are closed at the same time after the liquid is emptied, the presence of liquid in the first overflow pipe 308 and the second overflow pipe 314 is used as a reference basis. When liquid is first present in the first overflow pipe 308, it proves that the wind force is too small. At this time, the wind force is increased by the negative pressure unit 200. Conversely, when liquid is first present in the second overflow pipe 314, it proves that the wind force is too large. At this time, the wind force is reduced by the negative pressure unit 200. Through the dynamic adjustment of the negative pressure unit 200, reasonable adaptation to pulps of different particle sizes, viscosities, and water contents can be further achieved, thereby broadening the adaptation environment and adapted products of the dehydration system.

[0068] According to the embodiments of the present invention as described above, these embodiments do not describe all the details in detail, nor do they limit the invention to specific embodiments. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can make good use of the present invention and the modified use based on the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A vacuum dehydration system for papermaking, characterized in that: It comprises a water storage tank (101), a base (102) being installed at the bottom of the water storage tank (101), and an air intake pipe (103) being installed at the top of the water storage tank (101); An air outlet pipe (104) is installed on the top of the water storage tank (101); the air outlet pipe (104) is fixedly connected to the inlet of the negative pressure unit (200) through the air supply pipe (105); the negative pressure unit (200) is installed inside the installation box (106); a control cabinet (107) is installed on the side of the installation box (106); the control cabinet (107) is used to realize control and regulation of the water pump (109) and the negative pressure unit (200); A liquid level gauge (108) is installed on the side of the water storage tank (101), and the bottom of the water storage tank (101) is fixedly connected to a pipeline installed with a water pump (109); A separation unit (300) is installed inside the water storage tank (101), the separation unit (300) is in communication with the air inlet pipe (103), a secondary separation part (310) is installed inside the separation unit (300), the separation unit (300) and the secondary separation part (310) are connected in series, the secondary separation part (310) is in communication with the air outlet pipe (104), and the separation unit (300) and the secondary separation part (310) are used to realize a first gas-water separation and a second gas-water separation in sequence.

2. A vacuum dehydration system for papermaking according to claim 1, characterized in that: The separation unit (300) comprises an outer cylinder (301), the air inlet pipe (103) passes through the water storage tank (101) and is fixedly connected to the outer cylinder (301), an inner cylinder (303) is coaxially fixedly installed inside the outer cylinder (301), an annular channel is formed between the outer cylinder (301) and the inner cylinder (303), a spiral plate (304) is fixedly installed inside the annular channel, and the top end of the spiral plate (304) is fixed to the baffle (302); The inner surface of the outer cylinder (301) is evenly and vertically provided with a plurality of drainage grooves (305), and the drainage grooves (305) penetrate the connection between the spiral plate (304) and the outer cylinder (301) from top to bottom; The bottom of the outer cylinder (301) is coaxially fixed to the outer side of the first water storage tank (306), and an annular gap is provided between the first water storage tank (306) and the inner cylinder (303); The bottom of the first water storage tank (306) is fixedly connected to the first solenoid valve (307), and the side of the first water storage tank (306) is fixedly connected to the first overflow pipe (308). A first sensor (309) is installed on the first overflow pipe (308), and a probe of the first sensor (309) passes through the side wall of the first overflow pipe (308) and is arranged in the first overflow pipe (308).

3. A vacuum dehydration system for papermaking according to claim 2, characterized in that: The secondary separation part (310) comprises a conical cylinder (311), the inner side of the first water storage tank (306) is fixed to the conical cylinder (311), the bottom of the conical cylinder (311) is fixed to the second water storage tank (312), and the bottom of the second water storage tank (312) is fixedly connected to the second solenoid valve (313); The side surface of the second water storage tank (312) is fixedly connected to the second overflow pipe (314); a second sensor (315) is installed on the second overflow pipe (314); a probe of the second sensor (315) passes through the side wall of the second overflow pipe (314) and is arranged inside the second overflow pipe (314); The top of the inner cylinder (303) is fixed to the outer side of the circulation top (316), the inner side of the circulation top (316) is fixed to the annular grid (317), a mounting shaft is fixed to the bottom of the annular grid (317), a plurality of second annular plates (319) are mounted on the mounting shaft, and a plurality of first annular plates (318) are fixed to the inner surface of the inner cylinder (303), the first annular plates (318) and the second annular plates (319) are arranged at intervals.

4. A vacuum dehydration system for papermaking according to claim 1, characterized in that: The negative pressure unit (200) comprises a first shunt pipe (201), a plurality of the first shunt pipes (201) are fixedly connected to the gas delivery pipe (105), the first shunt pipe (201) is fixedly connected to the air inlet pipe (202), and the air inlet pipe (202) is fixedly connected to the inlet of the vacuum pump (203); The outlet of the vacuum pump (203) is fixedly connected to an air outlet pipe (204), the air outlet pipe (204) is fixedly connected to a second flow diversion pipe (205), a plurality of the second flow diversion pipes (205) are fixedly connected to an exhaust pipe (206), and the exhaust pipe (206) is installed on the top of the installation box (106).

5. A vacuum dehydration system for papermaking according to claim 2, characterized in that: The connection between the air inlet pipe (103) and the outer cylinder (301) is arranged along the tangent direction of the outer cylinder (301).

6. A vacuum dehydration system for papermaking according to claim 2, characterized in that: The baffle (302) is sealingly mounted in an annular channel formed by the outer cylinder (301) and the inner cylinder (303); the baffle (302) is arranged along the radial direction of the outer cylinder (301); and the baffle (302) is located in a position opposite to the flow direction of the air-water mixture at the connection between the air inlet pipe (103) and the outer cylinder (301).

7. A vacuum dehydration system for papermaking according to claim 2, characterized in that: The first water storage tank (306) is an annular cylindrical structure, and the bottom of the first water storage tank (306) is arranged in an arc shape.

8. A vacuum dehydration system for papermaking according to claim 3, characterized in that: The first annular plate (318) is a conical plate, and its diameter gradually decreases from top to bottom; the second annular plate (319) is a conical plate, and its diameter gradually increases from top to bottom; the inner diameter of the first annular plate (318) is smaller than the outer diameter of the second annular plate (319).

9. A vacuum dehydration system for papermaking according to claim 3, characterized in that: The diameter of the conical cylinder (311) gradually decreases from top to bottom, and the inner diameter of the first annular plate (318) is smaller than the outer diameter of the conical cylinder (311).

10. A vacuum dehydration system for papermaking according to claim 4, characterized in that: The structure consisting of the first flow-dividing pipe (201), the air inlet pipe (202), the vacuum pump (203), the air outlet pipe (204) and the second flow-dividing pipe (205) is installed in multiple groups inside the installation box (106).

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