Vacuum system applied to pulp machine and pulp machine system

Abstract

The utility model provides a vacuum system applied to a pulp machine, which comprises at least one steam-water separator, at least one magnetic suspension vacuum pump and at least one water ring vacuum pump, and each water ring vacuum pump is at least connected with one steam-water separator through a first vacuum suction pipeline. And one magnetic suspension vacuum pump is at least connected with one steam-water separator through a second vacuum suction pipeline. According to the scheme, a water ring vacuum pump, a first vacuum suction pipeline and a steam-water separator in a traditional vacuum system are reserved, and a magnetic suspension vacuum pump and a second vacuum suction pipeline are additionally arranged. The first vacuum suction pipeline and the second vacuum suction pipeline are connected with a first control valve and a second control valve in series respectively, and the first control valve and the second control valve are switched according to production requirements. The vacuum system adopting the magnetic suspension vacuum pump can effectively improve the overall efficiency and reduce the power consumption of the system. The utility model further provides a pulp machine system.

Description

TECHNICAL FIELD

[0001] The utility model belongs to vacuum pump technical field, especially related to a vacuum system and pulp board machine system for pulp board machine. BACKGROUND

[0002] In the paper production process, the vacuum dewatering system of the pulp board machine is one of the key links, but the traditional vacuum dewatering system has the problem of high power consumption. The vacuum dewatering system of the traditional pulp board machine is mainly composed of a vacuum pump, a pipeline, a valve and the like, and negative pressure is generated by the vacuum pump to make the water in the slurry be extracted under the action of the negative pressure, so as to achieve the purpose of dewatering. However, due to the limitations of the equipment structure and working principle, the traditional vacuum dewatering system often needs to consume a large amount of electric energy to maintain the vacuum state during operation, resulting in high power consumption.

[0003] Specifically, the power of the vacuum pump in the traditional vacuum dewatering system is large, and it needs to be continuously operated during operation to maintain the vacuum degree of the system, which makes the electric energy consumption huge. In addition, the traditional vacuum dewatering system also has certain deficiencies in dewatering efficiency, which leads to the need for longer time and more energy to complete the dewatering process in actual production, further increasing the power consumption. SUMMARY

[0004] The utility model aims at providing a vacuum system and pulp board machine system for pulp board machine, which can effectively reduce the power consumption of the system.

[0005] To solve the above technical problems, the utility model provides a vacuum system for pulp board machine, which comprises at least one steam-water separator, at least one magnetic suspension vacuum pump and at least one water ring vacuum pump, each water ring vacuum pump is connected with at least one steam-water separator through a first vacuum suction pipeline, and one magnetic suspension vacuum pump is connected with at least one steam-water separator through a second vacuum suction pipeline.

[0006] A first control valve is connected in series on each first vacuum suction pipeline, and a second control valve is connected in series on each second vacuum suction pipeline.

[0007] Optionally, in the above-mentioned vacuum system for pulp board machine, the first control valve and the second control valve are both solenoid valves.

[0008] Further comprising:

[0009] A control unit is arranged for controlling the opening and closing of the first control valve and the second control valve.

[0010] The monitoring feedback unit comprises vacuum degree detectors for detecting the vacuum degrees of the respective vacuum water suction boxes, and the plurality of vacuum water suction boxes are connected with the magnetic suspension vacuum pump and the water ring vacuum pump respectively, for monitoring the values of the respective vacuum degree detectors in real time and transmitting the data to the control unit.

[0011] Optionally, in the vacuum system applied to the pulp board machine, the control unit is configured to control the first control valve and the second control valve to be opened simultaneously when the vacuum degree is less than a preset value, and control the first control valve to be closed and the second control valve to be opened when the vacuum degree is greater than or equal to the preset value.

[0012] Optionally, in the vacuum system applied to the pulp board machine, at least one steam-water separator is in communication with an exhaust pipeline of a wire part of the pulp board machine.

[0013] Optionally, in the vacuum system applied to the pulp board machine, a drain pipe of the steam-water separator is in communication with an inlet of a spray water pipe of the wire part.

[0014] Optionally, in the vacuum system applied to the pulp board machine, an exhaust port of the magnetic suspension vacuum pump is in communication with a heat medium inlet of an air-water heat exchanger of the pulp board machine.

[0015] Optionally, in the vacuum system applied to the pulp board machine, the exhaust port of the magnetic suspension vacuum pump is in communication with a pipeline of a pulp board drying process of the pulp board machine.

[0016] Optionally, in the vacuum system applied to the pulp board machine, a cyclone guide plate is arranged in the inner cavity of the steam-water separator close to an air inlet.

[0017] Optionally, in the vacuum system applied to the pulp board machine, a flange quick-mounting interface and a bellows compensator are used to connect the first vacuum suction pipeline at a connection position of the first vacuum suction pipeline with the water ring vacuum pump and / or the steam-water separator.

[0018] Optionally, in the vacuum system applied to the pulp board machine, a flange quick-mounting interface and a bellows compensator are used to connect the second vacuum suction pipeline at a connection position of the second vacuum suction pipeline with the magnetic suspension vacuum pump and / or the steam-water separator.

[0019] The utility model also provides a pulp board machine system, including the vacuum system applied to the pulp board machine described above.

[0020] Optionally, in the pulp board machine system, a selection section, a wet part, a drying and cutting section and a packing line are sequentially connected, and the wet part comprises a wire part.

[0021] The utility model provides a vacuum system applied to a pulp board machine, which has the following advantages:

[0022] The water ring vacuum pump, the first vacuum suction pipeline and the steam-water separator in the traditional vacuum system are reserved, and the magnetic suspension vacuum pump and the second vacuum suction pipeline are added.

[0023] The pulp board machine system with the vacuum system has the same beneficial effects, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the provided drawings.

[0025] Figure 1 It is a structural schematic view of the water ring vacuum pump in the prior art;

[0026] Figure 2 It is a structural schematic view of the magnetic suspension vacuum pump provided by the embodiment of the present application;

[0027] Figure 3 It is a structural schematic view of the vacuum system applied to the pulp board machine and the pulp board machine provided by the embodiment of the present application;

[0028] Figure 4 It is a structural schematic view of the vacuum system applied to the pulp board machine provided by the embodiment of the present application.

[0029] In the above figure:

[0030] 110 - water ring vacuum pump; 111 - first control valve;

[0031] 120 - magnetic suspension vacuum pump; 121 - second control valve;

[0032] 200 - steam-water separator. DETAILED DESCRIPTION

[0033] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0034] The core of the utility model discloses a vacuum system and pulp board machine system applied to the pulp board machine, which can effectively reduce the power consumption of the system.

[0035] In order to make the skilled in the art better understand the technical scheme provided by the utility model, the utility model will be further explained in detail below in combination with the drawings and specific embodiments.

[0036] In order to reduce the power consumption and improve the production efficiency, the industry has been exploring and researching new energy-saving technology and equipment. A new type of dewatering technology and equipment is introduced into the production of the pulp board machine, and the latest magnetic suspension turbine vacuum technology is used for energy-saving reconstruction, which reduces the power consumption and improves the dewatering efficiency to a certain extent.

[0037] Specifically, please refer to Figures 2-4 The utility model discloses a vacuum system applied to the pulp board machine, which comprises at least one steam-water separator 200, at least one magnetic suspension vacuum pump 120 and at least one water ring vacuum pump 110.

[0038] Each water ring vacuum pump 110 is connected with at least one steam-water separator 200 through a first vacuum suction pipeline, and one magnetic suspension vacuum pump 120 is connected with at least one steam-water separator 200 through a second vacuum suction pipeline.

[0039] As shown in Figure 2 The magnetic suspension vacuum pump 120 can adopt existing products at home and abroad and be applied to the field of the pulp board machine. Its key technology is the combination of the magnetic suspension permanent magnet synchronous motor and the three-dimensional flow impeller turbine type vacuum pump technology, which belongs to the domestic leading technology. The new magnetic suspension vacuum pump 120 is of centrifugal structure, directly works on the gas, and the efficiency is between 65% and 75%. Moreover, the exhaust heat recovery can be carried out, and the energy utilization rate can be further improved. In addition, the magnetic suspension permanent magnet synchronous motor is used for driving, and the efficiency of the whole machine can be increased by about 5%, the noise is low, and the operating efficiency can reach more than 80%.

[0040] A first control valve 111 is connected in series on each first vacuum suction pipeline, and a second control valve 121 is connected in series on each second vacuum suction pipeline. According to the production needs, the first control valve 111 and the second control valve 121 are switched to determine whether to use the original water ring vacuum pump 110, add the magnetic suspension vacuum pump 120 or use the original water ring vacuum pump 110 and the added magnetic suspension vacuum pump 120 at the same time.

[0041] It should be noted that the steam-water separator 200 is used to be connected with the exhaust pipeline of each process of the pulp board machine, and the water carried in the exhaust and the free water are separated and collected into the felt water tank and the white water tank.

[0042] The application provided by the scheme is applied to a vacuum system of a pulp plate machine. The water ring vacuum pump 110, the first vacuum suction pipeline and the steam-water separator 200 in the traditional vacuum system are retained, and the magnetic suspension vacuum pump 120 and the second vacuum suction pipeline are added. The first vacuum suction pipeline and the second vacuum suction pipeline are respectively connected in series with the first control valve 111 and the second control valve 121, and the first control valve 111 and the second control valve 121 are switched according to production needs. The vacuum system adopting the magnetic suspension vacuum pump 120 can effectively improve the overall efficiency and reduce the power consumption of the system.

[0043] It is found in practice that the overall efficiency can be improved from 43% of the traditional one to a maximum of 87%, the system maintenance is simpler, and the service life of the equipment is gradually improved.

[0044] The scheme can also adopt a dual-mode intelligent switching control system, develop a vacuum degree self-adaptive adjustment algorithm, dynamically switch the operation mode of the magnetic suspension vacuum pump 120 and the standby water ring vacuum pump according to parameters such as vehicle speed and pulp water content, and balance energy consumption and dehydration efficiency.

[0045] At the same time, a pressure sensor array is configured to realize partitioned pressure control (error ±0.5kPa) of the vacuum box, avoid local overload and energy consumption. An Internet of Things terminal is deployed to collect multiple parameters such as current and vacuum degree in real time, an AI model is used to predict the optimal operation parameter combination, and the annual energy saving potential is further improved.

[0046] In specific embodiments, the first control valve 111 and the second control valve 121 are both solenoid valves. The case also includes a control unit and a monitoring feedback unit. The control unit is used to control the opening and closing of the first control valve 111 and the second control valve 121. The monitoring feedback unit includes a vacuum degree detector for detecting the vacuum degree of each vacuum water suction box, and the multiple vacuum water suction boxes are connected with the magnetic suspension vacuum pump 120 and the water ring vacuum pump 110, respectively, for real-time monitoring of the values of each vacuum degree detector and transmitting the data to the control unit.

[0047] In particular, the control unit is used to control the first control valve 111 and the second control valve 121 to be opened at the same time when the vacuum degree is less than a preset value. The preset value is a certain vacuum degree value set according to actual working conditions. When the vacuum system is in a low vacuum stage, two types of vacuum pumps need to be matched to quickly increase the air suction rate and shorten the time to reach the target vacuum, and the energy consumption is high at this time.

[0048] When the vacuum degree is greater than or equal to the preset value, the first control valve 111 is controlled to be closed, and the second control valve 121 is controlled to be opened. When the vacuum system is in a high vacuum maintenance stage, only the magnetic suspension vacuum pump 120 can be used to quickly achieve the target vacuum time.

[0049] The dynamic switching mechanism based on the operating parameter vacuum degree ensures the selection of the optimal type of vacuum pump operating mode under different working conditions, and realizes the best balance between energy consumption and dehydration efficiency.

[0050] In specific embodiments, the at least one steam-water separator 200 is in communication with an exhaust duct of a wire section of a pulp board machine.

[0051] It should be noted that the pulp board machine is composed of four parts: a cleaning section, a wet section, a drying and cutting section, and a packing line. Among them, the wire section is a key part of the wet section of the pulp board machine, mainly responsible for dehydrating and preliminarily shaping the pulp. In the wire section, the pulp is gradually dehydrated and preliminarily shaped into a pulp board shape through the support and extrusion of the wire mesh belt and the guidance and pressing of components such as chest rollers and breast rollers. The structure and working principle of the wire section have an important influence on subsequent processes such as drying, cutting, and packing.

[0052] For example, in the original system, six water ring vacuum pumps are used for the operation of the wire section. After improvement, as shown in Figure 3 , one magnetic suspension vacuum pump 120 with a power of 250KW is selected to replace the original 853P039 water ring vacuum pump, and one magnetic suspension vacuum pump 120 with a power of 400KW is selected to replace the original 853P040 and 853P041 two water ring vacuum pumps, and the remaining three water ring vacuum pumps of the original system are reserved as standby.

[0053] Further, the drain pipe of the steam-water separator 200 is in communication with the inlet of the spray water pipe of the wire section, so that the water separated by the steam-water separator 200 can be collected and used as supplementary water for the wire section after filtration, realizing the recycling of water resources.

[0054] In order to reduce the impact and wear of liquid droplets on the impeller and prolong the service life of the equipment, a cyclone guide plate is arranged at the inlet of the steam-water separator 200.

[0055] In order to effectively recover heat energy, the exhaust port of the magnetic suspension vacuum pump 120 is in communication with the heat medium inlet of the air-water heat exchanger of the pulp board machine. The air-water heat exchanger is installed at the exhaust port of the magnetic suspension vacuum pump 120 to heat the process water, and the process water is used for water replenishment of the pulp board machine system. By recycling the heat energy of the exhaust of the magnetic suspension vacuum pump 120, the temperature of the pulp board machine system can be improved, and the steam consumption of the pulp board machine can be saved.

[0056] Further, an intelligent temperature control valve can be connected in series on the pipeline where the exhaust port of the magnetic suspension vacuum pump 120 is in communication with the heat medium inlet of the air-water heat exchanger of the pulp board machine, but the intelligent temperature control valve is controlled to be opened or closed when a preset condition is reached. By integrating the air-water heat exchanger and the intelligent temperature control valve together, the heat load demand of the production line is automatically matched, and the comprehensive energy efficiency can be improved by 12% or even more.

[0057] Correspondingly, the exhaust port of the magnetic suspension vacuum pump 120 can also be communicated with the pipeline of the pulp board drying process of the pulp board machine, and a waste heat recovery module is added for the high temperature exhaust characteristic of the magnetic suspension vacuum pump 120, so that the high-temperature steam heat is used for the pulp board drying process, and secondary utilization of energy is realized.

[0058] The connecting pipeline between the steam-water separator 200 and the magnetic suspension vacuum pump 120, the water ring vacuum pump 110 and the vacuum dehydration component can be further optimized and designed, the smoothness of the inner wall of the first vacuum suction pipeline and the second vacuum suction pipeline and the elbow curvature are optimized, the gas flow resistance is reduced, the pipeline resistance and pressure loss are reduced, and the overall performance of the system is improved.

[0059] Specifically, the magnetic suspension vacuum pump 120 comprises a permanent magnet synchronous motor and a three-dimensional flow impeller, the permanent magnet synchronous motor comprises a magnetic bearing coil, a rotor and a stator, and the rotor is in driving connection with the three-dimensional flow impeller.

[0060] By combining the magnetic suspension bearing technology with the three-dimensional flow impeller, the friction loss of the traditional mechanical bearing is cancelled, and the operation efficiency of the vacuum pump is improved to more than 80%. The three-dimensional flow impeller optimizes the gas flow path, reduces the turbulent loss, and the energy saving rate is improved by 5%-8% compared with the traditional impeller.

[0061] In order to improve the corrosion resistance of the impeller, the surface of the three-dimensional flow impeller is sprayed with a tungsten carbide-ceramic composite material layer. Spraying the surface of the impeller with the tungsten carbide-ceramic composite material can improve the anti-cavitation performance, is suitable for high humidity working conditions, and the maintenance period can be extended to 8000 hours.

[0062] In specific embodiments, the connection mode of the first vacuum suction pipeline with the water ring vacuum pump 110 and / or the steam-water separator 200 can adopt a flange quick-mounting interface and a bellows compensator.

[0063] Similarly, the connection mode of the second vacuum suction pipeline with the magnetic suspension vacuum pump 120 and / or the steam-water separator 200 can adopt a flange quick-mounting interface and a bellows compensator.

[0064] The flange quick-mounting interface + bellows compensator design retains more than 90% of the original system pipeline, and the reconstruction construction period is shortened to 72 hours.

[0065] In addition, the utility model also provides a pulp board machine system, including the vacuum system for pulp board machine in the foregoing.

[0066] Obviously, the pulp board machine system comprising the vacuum system for pulp board machine has the same beneficial effects, which will not be repeated here.

[0067] The case also includes a selection section, a wet part, a drying cutting plate and a packing line in turn, the wet part includes a net part.

[0068] The main equipment of the selection section includes a first pressure screen, a second pressure screen, a third pressure screen, a fourth pressure screen, a first light slag remover, a second light slag remover, a first heavy slag remover, a second heavy slag remover, a slurry pump and a net front screen. The main equipment of the wet part includes a flow box, a double net forming, a net carpet boot pressure and a double carpet boot pressure. The main equipment of the drying cutting plate includes an air cushion dryer and a cutting plate machine. The main equipment of the packing line includes a weighing machine, a packing machine, a packing paper adding machine, a bundling machine, a code spraying machine, a folding machine, a stacking machine and a combined packing machine.

[0069] Table 1 Comparison of technical indicators of prior art and the present scheme

[0070]

[0071] According to Table 1, it can be seen that the economic benefit, energy saving and environmental protection benefit of the present scheme are remarkable, which is an important measure to realize energy saving and emission reduction, reduce cost and realize green development.

[0072] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right and the like, is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and cannot be understood as indicating or implying that the device or element indicated must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application.

[0073] In the description of the present application, the meaning of multiple is more than two, and if the first and the second are described, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0074] In the description of the embodiments of the present application, unless otherwise specified, the words such as "and / or" represent the meaning of or, for example, A / B can represent A or B; "and / or" in this paper is only a description of the association relationship of the associated object, which means that there can be three kinds of relationships, for example, A and / or B, which can represent the existence of A alone, the existence of A and B, and the existence of B alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0075] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installation, connection and the like should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application according to the specific content of the technical scheme.

[0076] The various embodiments are described in the specification by way of progression, each building on the last to facilitate ease of understanding. The same or similar reference numerals are used in the drawings and description to refer to the same or like parts, components and operations throughout.

[0077] The principles and implementation modes of the present application are described by using specific examples in the specification. The above description of the embodiments is only used to help understand the method of the present application and its core idea. It should be pointed out that, for those skilled in the art, without departing from the principles of the present application, the present application can be improved and modified in many ways. These improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A vacuum system for application to a pulp board machine, characterized in that, The system comprises at least one steam-water separator (200), at least one magnetic suspension vacuum pump (120), and at least one water ring vacuum pump (110), each of the water ring vacuum pumps (110) is connected to at least one steam-water separator (200) through a first vacuum suction pipeline, and one magnetic suspension vacuum pump (120) is connected to at least one steam-water separator (200) through a second vacuum suction pipeline; Each of the first vacuum suction pipelines is connected in series with a first control valve (111), and each of the second vacuum suction pipelines is connected in series with a second control valve (121).

2. A vacuum system for a board line according to claim 1, characterized in that The first control valve (111) and the second control valve (121) are both solenoid valves. Further comprising: A control unit for controlling the opening and closing of the first control valve (111) and the second control valve (121); A monitoring feedback unit comprising vacuum degree detectors for detecting the vacuum degrees of the vacuum water suction boxes, a plurality of the vacuum water suction boxes are connected to the magnetic suspension vacuum pumps (120) and the water ring vacuum pumps (110), respectively, for real-time monitoring of the values of each of the vacuum degree detectors and transmitting data to the control unit.

3. A vacuum system for a board line according to claim 2, characterized in that The control unit is used to control the first control valve (111) and the second control valve (121) to be opened at the same time when the vacuum degree is less than a preset value, and to control the first control valve (111) to be closed and the second control valve (121) to be opened when the vacuum degree is greater than or equal to the preset value.

4. The vacuum system for a size press as defined in claim 1, wherein At least one steam-water separator (200) is in communication with the exhaust pipeline of the net section of the pulp board machine.

5. A vacuum system for a board line according to claim 4, characterized in that The drain pipe of the steam-water separator (200) is in communication with the inlet of the spray water pipe of the net section.

6. A vacuum system for use in a board machine according to claim 1, characterized in that The exhaust port of the magnetic suspension vacuum pump (120) is in communication with the heat medium inlet of the gas-water heat exchanger of the pulp board machine. And / or, the exhaust port of the magnetic suspension vacuum pump (120) is in communication with the pipeline of the pulp board drying process of the pulp board machine.

7. A vacuum system for use in a board machine according to claim 1, characterized in that The inner cavity of the steam-water separator (200) is provided with a cyclone guide plate near the air inlet.

8. A vacuum system for use in a board machine according to claim 1, characterized in that The first vacuum suction pipeline is connected by using a flange quick-mounting interface and a bellows compensator at the connection with the water ring vacuum pump (110) and / or the steam-water separator (200); And / or, the second vacuum suction pipeline is connected by using a flange quick-mounting interface and a bellows compensator at the connection with the magnetic suspension vacuum pump (120) and / or the steam-water separator (200).

9. A board line system characterized by The system comprises the vacuum system applied to the pulp board machine according to any one of claims 1-8.

10. The slusher system of claim 9, wherein, Further comprising a selection section, a wet section, a drying and cutting section, and a packing line connected in sequence, and the wet section comprises a net section.

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