Steam circulation system for corrugated board production

Abstract

The invention discloses a steam circulation system for corrugated board production. The steam circulation system comprises a main control unit, a paperboard drying unit, a steam generation unit and a steam recovery unit, and the steam recovery unit comprises a heat exchange assembly, a power assembly and a gas-liquid separation assembly; the heat exchange assembly comprises a heat exchange water tank, a steam recovery pipeline, a recovery connector and a filter assembly arranged in the recovery connector, the recovery rate of steam heat is increased, meanwhile, the filter assembly is additionally arranged on the heat exchange assembly, steam for drying paperboards is filtered, and therefore the steam recovery capacity is improved; therefore, the steam heat utilization rate is improved, and the heat supply cost is saved.

Description

Technical Field

[0001] The invention relates to the technical field of corrugated board production equipment, in particular to a steam circulation system for corrugated board production. Background Art

[0002] Corrugated paper is particularly widely used in reality, and a large part of it can be recycled and reused for mechanical equipment packaging. Corrugated paper can be seen in everything from hamburger and cream cake packaging. Normally, it is made from base paper, which is pressed into the shape of corrugated paper and then cut. Among the steps here, pressing is the most prone to problems. The pressing process is to compress the corrugated paper core, and the machine pulls the paper out of the large roll and approaches the high-temperature and high-humidity geared corrugated roller. Under the pressure of the two gear rollers, the paper is formed into a corrugated state with alternating concave and convex shapes, thus forming a corrugated board. The formed corrugated paper core will use glue to stick to multiple sheets of paper, and then dry them. The board will often warp. Using a steam generator for drying will not cause such a situation. The steam generator dries mainly in the form of gas, which is relatively uniform and has a huge amount of steam, so it can be dried for a long time.

[0003] In existing corrugated paper production lines, steam generators are used as supporting equipment for corrugated paper drying, and related steam circulation systems are designed to save energy as much as possible and reduce production costs. However, other technical problems arise during the drying process. When the equipment recovers steam, it is unable to filter the particulate dust in the steam, which can easily reduce the service life of the pump body, and the recovered condensed water is prone to adhere to dust. The Chinese patent with application number "2022205878879" discloses a steam circulation device for a corrugated board production line. When condensed water appears on the inner wall of the second shell, it is transported to the water tank through the second connecting pipe, and the steam adsorbed by the steam recovery port is filtered through the filter to prevent dust and other objects from being inhaled when the steam is recovered. Although the reduction in service life caused by dust can be avoided to a certain extent, for the entire steam circulation system, the steam heat recovery capacity is poor and the utilization rate is low, and the production cost cannot be effectively reduced, wasting heating resources.

[0004] A Chinese patent with application number "2023226880892" discloses a high-efficiency steam recovery and energy-saving device for corrugated paper production. During use, the movable plate is moved by rotating the threaded rod, which facilitates the installation of the screen plate and reduces blockage caused by impurities such as scale inside the recovery box. The scraper is moved by rotating the fan blades and cooperating with the limit plate to facilitate cleaning of the screen plate. The second fixed block is moved by the spring to facilitate the discharge of excess gas. The device achieves cleaning of the screen plate while improving the steam recovery effect to a certain extent. However, in actual work, since the recovered steam first passes through the filtering mechanism, the various components of the filtering mechanism consume most of the heat of the steam, resulting in a low proportion of the available heat of the subsequent exhaust gas, and the purpose of steam recovery is not achieved. Summary of the invention

[0005] The purpose of the present invention is to provide a steam circulation system for corrugated board production, which can not only filter the board drying steam, but also improve the steam recovery capacity and heat utilization rate to solve the problems in the prior art.

[0006] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0007] A steam circulation system for corrugated cardboard production comprises a main control unit, a cardboard drying unit, a steam generating unit connected to the cardboard drying unit, and a steam recovery unit connected to the cardboard drying unit, wherein one end of the steam recovery unit away from the cardboard drying unit is connected to the steam generating unit, the steam recovery unit comprises a heat exchange component, a power component and a gas-liquid separation component, the heat exchange component, the power component and the gas-liquid separation component are connected in sequence through a delivery pipeline, the heat exchange component is connected to an external water supply assembly, the heat exchange component comprises a heat exchange water tank, a steam recovery pipeline, a recovery joint and a filter component arranged in the recovery joint, the steam recovery pipeline is arranged in the heat exchange water tank along the length direction, the inlet end of the steam recovery pipeline is connected to the cardboard drying unit, and the filter component is arranged between the steam recovery pipeline and the cardboard drying unit.

[0008] Furthermore, the steam recovery pipeline consists of a nozzle section, a heat exchange section and an installation section. The nozzle section presents a zooming nozzle structure along the steam flow direction. The inner diameter of the pipeline of the heat exchange section is equal to the inner diameter of the tail end of the nozzle section. The installation section is connected to the input end of the power component through a delivery pipeline.

[0009] Furthermore, a slide groove is provided on the outer wall of the tube of the heat exchange section, and the slide groove is spirally distributed along the axial direction of the steam recovery pipeline. A heat conductive frame is provided between the steam recovery pipeline and the water exchange tank, and the heat conductive frame includes a mounting frame and a plurality of heat conductive plates arranged on the mounting frame, each of the heat conductive plates is an arc-shaped blade, the curvature of the heat conductive plate is the same as the curvature of the slide groove, and the heat conductive plate is tightly arranged against the side wall of the slide groove.

[0010] Furthermore, the heat-conducting frame is an integrally formed structure, and the heat-conducting frame and the steam recovery pipeline are both made of heat-conducting materials.

[0011] Furthermore, the filter assembly includes a shell and a filter element, the filter element consists of a disassembly frame and a plurality of arc-shaped filter plates installed on the disassembly frame, the disassembly frame is symmetrically provided with more than one set of limit blocks along the axial direction, and the inner wall of the shell is provided with a limit groove matching the limit block for detachable connection between the filter element and the shell.

[0012] Furthermore, the arc-shaped filter plates are bent along the steam conveying direction, and each of the arc-shaped filter plates is alternately distributed up and down along the axis direction of the shell and is provided with a through hole at the axis of the shell.

[0013] Furthermore, the power component and the gas-liquid separation component are both connected to the main control unit signal.

[0014] Furthermore, it also includes a temperature monitoring unit, which is arranged in the paperboard drying unit and is connected to the main control unit by signal.

[0015] Furthermore, the water inlet end of the water exchange water tank is connected to the external water supply assembly through a water supply pipe, and the water outlet end is connected to the steam generating unit through a water delivery pipe.

[0016] Furthermore, a liquid storage device is provided on the conveying pipeline between the power component and the gas-liquid separation component, and the liquid storage device is connected to the steam generating unit through a solenoid valve. A pressure relief device is provided on one side of the liquid storage device, and the pressure relief device is arranged on the conveying pipeline between the power component and the gas-liquid separation component. The solenoid valve is electrically connected to the main control unit.

[0017] The beneficial effects of the present invention are as follows: the present invention provides a steam circulation system for corrugated cardboard production, which recovers steam from cardboard drying through a steam recovery pipeline, and the cooling water in the heat exchange water tank completely contacts the steam recovery pipeline for heat exchange, thereby improving the steam heat recovery rate, and at the same time, a filter component is added to the heat exchange component to filter the steam from cardboard drying, thereby improving the steam recovery capacity, thereby improving the steam heat utilization rate, and saving heating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the working process of a neat circulation system for corrugated paper production provided by the present invention;

[0019] Figure 2 A schematic diagram of the overall structure of the steam recovery unit provided by the present invention;

[0020] Figure 3 A schematic cross-sectional structure diagram of a heat exchange component provided by the present invention;

[0021] Figure 4 A schematic diagram of the overall structure of a water exchange water tank provided by the present invention;

[0022] Figure 5 A schematic diagram of the overall structure of the steam recovery pipeline provided by the present invention;

[0023] Figure 6 A schematic diagram of the overall structure of the heat conduction frame provided by the present invention;

[0024] Figure 7 This is a schematic diagram of the overall structure of the recovery joint provided by the present invention;

[0025] Figure 8 The figure is a right side view of the filter assembly provided by the present invention.

[0026] Notes in the figure: 100, main control unit; 200, cardboard drying unit; 300, steam generating unit; 400, steam recovery unit; 410, heat exchange component; 411, heat exchange water tank; 4111, water inlet; 4112, water outlet; 412, steam recovery pipeline; 4121, nozzle section; 4122, heat exchange section; 4123, installation section; 4124, chute; 413, filter component; 4131, housing; 4132, filter element; 4133. disassembly rack; 4134. arc filter plate; 4135. limit block; 4136. limit groove; 414. heat conducting rack; 4141. mounting rack; 4142. heat conducting sheet; 420. power assembly; 430. gas-liquid separation assembly; 431. air inlet; 432. air outlet; 433. liquid outlet; 500. external water supply unit; 600. temperature monitoring unit; 700. liquid storage device; 800. pressure relief device; 900. recovery joint. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific implementation disclosed below.

[0028] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] The examples are as follows:

[0030] like Figures 1 to 3 A steam circulation system for corrugated cardboard production shown in the figure comprises a main control unit 100, a cardboard drying unit 200, a steam generating unit 300 connected to the cardboard drying unit 200, and a steam recovery unit 400 connected to the cardboard drying unit 200, wherein the end of the steam recovery unit 400 away from the cardboard drying unit 200 is connected to the steam generating unit 300, wherein the power component 420 and the gas-liquid separation component 430 are both connected to the main control unit 100 by signal, the cardboard drying unit 200 is a dryer structure of a corrugated cardboard drying production line, and has the same structure as the dryer with the publication number "CN220083579U", the steam generating unit 300 is a steam generator displayed at the website "http: / / fushite.77991.com / videos / 264290.html", and the steam recovery unit 400 comprises a heat exchange component 410, a power component 420 and a gas-liquid separation component 430. The heat exchange assembly 410, the power assembly 420 and the gas-liquid separation assembly 430 are connected in sequence through a delivery pipeline. Specifically, the air inlet end 431 of the gas-liquid separation assembly 430 is connected to the air outlet end of the power assembly 420. The power assembly 420 is a magnetic pump with a model number of MPH-F-440CCV5. The gas-liquid separation assembly 430 is a gas-liquid separator with a model number of DN25. The heat exchange assembly 410 is connected to the external water supply assembly 500. The external water supply assembly 500 is a pure water supply tower and a water delivery pump, the heat exchange component 410 includes a heat exchange water tank 411, a steam recovery pipeline 412, a recovery joint 900 and a filter component 413 arranged in the recovery joint 900, the steam recovery pipeline 412 is detachably connected in the heat exchange water tank 411 along the length direction, the inlet end of the steam recovery pipeline 412 is connected to the paperboard drying unit 200, and the filter component 413 is arranged between the steam recovery pipeline 412 and the paperboard drying unit 200.

[0031] As a technical solution of this embodiment, further, Figure 5The steam recovery pipeline 412 shown is composed of a nozzle section 4121, a heat exchange section 4122 and an installation section 4123. The installation section 4123 passes through the heat exchange water tank 411 and is connected to the power assembly 420 through the gas transmission pipeline. The nozzle section 4121 is a convergent nozzle structure along the steam flow direction. The inner diameter of the pipeline of the heat exchange section 4122 is equal to the inner diameter of the tail end of the nozzle section 4121. The installation section 4123 is connected to the input end of the power assembly 420 through the transmission pipeline. The convergent nozzle structure of the nozzle section 4121 enables the recovered steam fluid to reduce pressure and increase speed, and quickly flow into the heat exchange section 4122, thereby minimizing heat loss during the steam recovery process. A chute 4124 is provided on the outer wall of the tube of the heat exchange section 4122, and the chute 4124 is spirally distributed along the axial direction of the steam recovery pipeline 412. A heat-conducting frame 414 is provided between the steam recovery pipeline 412 and the water exchange tank 411. The heat-conducting frame 414 includes a mounting frame 4141 and a plurality of heat-conducting sheets 4142 provided on the mounting frame 4141. Each heat-conducting sheet 4142 is an arc-shaped blade. The curvature of the heat-conducting sheet 4142 is the same as that of the chute 4124, and the heat-conducting sheet 4142 is tightly arranged against the side wall of the chute 4124. In addition, the heat-conducting frame 414 is an integrally formed structure, and the heat-conducting frame 414 and the steam recovery pipeline 412 are both made of heat-conducting materials.

[0032] During installation, the water inlet 4111 of the heat exchange water tank 411 is connected to the water outlet of the external water supply assembly 500, and the water outlet 4112 of the heat exchange water tank 411 is connected to the water tank of the steam generating unit 300, so that the pure water with recovered steam heat is delivered to the steam generating unit 300 for circulation to generate steam. The steam recovery pipeline 412 first passes through the recovery joint 900, and then the heat conductive sheet 4142 of the heat conductive frame 414 is spirally inserted into the slide groove 4124 of the steam recovery pipeline 412 until the heat conductive frame 414 is tightly pressed against the recovery joint 900. After the sealing ring is installed at the flange connection end of the heat exchange water tank 411, the steam The installation section 4123 of the recovery hanging line 412 passes through the installation hole on the left side of the water exchange tank 411, and the recovery joint 900 is connected to the water exchange tank 411 through a flange. The filter component 413 is placed at the inlet end of the recovery joint 900 along the axial direction. When the heat exchange component 410 is connected to the steam recovery end of the paperboard drying unit through a pipeline, the pipeline connector is pressed against the filter component 413. Sealing rings are provided between the installation section 4123 of the steam recovery pipeline 412 and the water exchange tank 411, and between the filter component 413 and the recovery joint 900 to meet the sealing requirements of the device, thereby completing the installation of the heat exchange component 410.

[0033] After the recovered steam enters the steam recovery pipeline 412, the heat of the steam is transferred to the cooling pure water in the water exchange tank 411 through the heat exchange section 4122. In order to improve the heat exchange efficiency of the pure water, the heat conductive sheet 4142 on the heat conductive frame 414 is in close contact with the steam recovery pipeline 412, so that the pure water in the water exchange tank 411 away from the steam recovery pipeline 412 can be heat exchanged through multiple groups of heat conductive sheets 4142.

[0034] like Figure 3 , Figure 7 , Figure 8 The filter assembly 413 shown includes a shell 4131 and a filter element 4132. The filter element 4132 is composed of a disassembly frame 4133 and a plurality of arc-shaped filter plates 4134 installed on the disassembly frame 4133. The disassembly frame 4133 is symmetrically provided with one or more limit blocks 4135 along the axial direction. The inner wall of the shell 4131 is provided with a limit groove 4136 matching the limit block 4135 for detachable connection between the filter element 4132 and the shell 4131.

[0035] As a technical solution of this embodiment, further, the arc filter plate 4134 is bent along the steam delivery direction, each arc filter plate 4134 is alternately distributed up and down along the axis direction of the shell 4131 and a through hole is provided at the axis of the shell 4131.

[0036] Compared with the prior art, the steam recovery unit 400 provided by the present invention is easy to disassemble and assemble, and the various structures of the filter component 413 are detachably connected, so that regular maintenance and replacement can be achieved. Compared with the filter structure in the steam circulation equipment of the corrugated cardboard production line with application number "2023226880892", it has a more outstanding filtering effect. The automatic cleaning of the filter structure in the prior art exposes many problems in actual work, such as poor actual cleaning effect of the device, frequent downtime, and inconvenient maintenance and disassembly. The filter component 413 in the technical solution of this embodiment is easy to disassemble and assemble, and the distribution structure of the household aluminum plate 4134 does not affect the circulation rate of steam.

[0037] As a technical solution of this embodiment, further, the steam circulation system also includes a temperature monitoring unit 600. The temperature monitoring unit 600 uses a temperature transmitter of model MKWZPB-341, which is arranged in the paperboard drying unit 200 and is connected to the main control unit 100 by signal.

[0038] During the production process, the maximum temperature of the corrugated cardboard cannot exceed 60°C. If it is exposed to a higher temperature, the corrugated cardboard is prone to softening, losing rigidity and tearing, resulting in packaging failure. Therefore, a temperature monitoring unit 600 is set in the cardboard drying unit 200. The staff sets the temperature monitoring threshold range of 0°C to 55°C through the main control unit 100. When the temperature in the cardboard drying unit 200 exceeds the threshold of 55°C, the main control unit 100 receives the signal change of the temperature monitoring unit 600, sends a command to the power component 420, starts the magnetic pump, forms a negative pressure state in the heat exchange component 410, and passes Steam is recovered through the collecting port in the paperboard drying unit 200. After most of the heat is recovered by the steam passing through the heat exchange component 410, a small amount of steam enters the gas-liquid separation component 430 through the magnetic pump for gas-liquid separation. The gas outlet 432 of the gas-liquid separation component 430 is connected to the steam generating pipeline of the steam generating unit 300, and the separated gas is re-delivered to the steam generating unit 300 for circulation and drying. The liquid outlet 433 of the gas-liquid separation component 430 is connected to the steam water tank of the steam generating unit 300, and the separated liquid is re-delivered to the steam generating unit 300 for circulation and steam generation.

[0039] In addition, a liquid storage device 700 is provided on the conveying pipeline between the power component 420 and the gas-liquid separation component 430. The liquid storage device 700 is a funnel-shaped liquid storage tank. The liquid storage device 700 is connected to the steam water tank of the steam generating unit 300 through a solenoid valve. A pressure relief device 800 is provided on one side of the liquid storage device 700. The pressure relief device 800 is arranged on the conveying pipeline between the power component 420 and the gas-liquid separation component 430. The solenoid valve is electrically connected to the main control unit 100. After passing through the heat exchange component 410 and the power component 420, the steam will be liquefied due to the decrease in temperature. Therefore, the liquid storage device 700 can collect the cooled pure water in the pipeline, and then regularly deliver it to the steam generating unit 300 through the control of the solenoid valve.

[0040] In summary: the present invention provides a steam circulation system for corrugated cardboard production, which recycles the steam from cardboard drying through a steam recovery pipeline, and the cooling water in the heat exchanger tank completely contacts the steam recovery pipeline for heat exchange to improve the steam heat recovery rate. At the same time, a filter component is added to the heat exchange component to filter the steam from cardboard drying, thereby improving the steam recovery capacity, thereby improving the steam heat utilization rate, and saving heating costs.

[0041] The basic principles and main features of the present invention and the advantages of the present invention are shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure marks in the claims should not be regarded as limiting the claims involved.

[0042] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A steam circulation system for corrugated board production, comprising a main control unit, a board drying unit, a steam generating unit connected to the board drying unit, and a steam recovery unit connected to the board drying unit, characterized in that: The end of the steam recovery unit away from the cardboard drying unit is communicated with the steam generating unit, the steam recovery unit comprises a heat exchange component, a power component and a gas-liquid separation component, the heat exchange component, the power component and the gas-liquid separation component are connected in sequence through a delivery pipeline, the heat exchange component is communicated with an external water supply assembly, the heat exchange component comprises a heat exchange water tank, a steam recovery pipeline, a recovery joint and a filter component arranged in the recovery joint, the steam recovery pipeline is arranged in the heat exchange water tank along the length direction, the inlet end of the steam recovery pipeline is communicated with the cardboard drying unit, and the filter component is arranged between the steam recovery pipeline and the cardboard drying unit.

2. A steam circulation system for corrugated board production according to claim 1, characterized in that: The steam recovery pipeline consists of a nozzle section, a heat exchange section and an installation section. The nozzle section presents a zoom nozzle structure along the steam flow direction. The inner diameter of the pipeline of the heat exchange section is equal to the inner diameter of the tail end of the nozzle section. The installation section is connected to the input end of the power component through a delivery pipeline.

3. A steam circulation system for corrugated board production according to claim 2, characterized in that: The outer wall of the tube of the heat exchange section is provided with a slide groove, and the slide groove is spirally distributed along the axial direction of the steam recovery pipeline. A heat conduction frame is provided between the steam recovery pipeline and the water exchange water tank, and the heat conduction frame includes a mounting frame and a plurality of heat conduction plates arranged on the mounting frame, each of the heat conduction plates is an arc-shaped blade, the curvature of the heat conduction plate is the same as the curvature of the slide groove, and the heat conduction plate is tightly arranged against the side wall of the slide groove.

4. A steam circulation system for corrugated board production according to claim 3, characterized in that: The heat-conducting frame is an integrally formed structure, and the heat-conducting frame and the steam recovery pipeline are both made of heat-conducting materials.

5. The steam circulation system for corrugated board production according to claim 1, characterized in that: The filter assembly includes a shell and a filter element. The filter element consists of a disassembly frame and a plurality of arc-shaped filter plates installed on the disassembly frame. The disassembly frame is symmetrically provided with one or more limit blocks along the axial direction. The inner wall of the shell is provided with limit grooves matching the limit blocks so as to enable the filter element to be detachably connected to the shell.

6. A steam circulation system for corrugated board production according to claim 5, characterized in that: The arc filter plates are bent along the steam conveying direction, and each of the arc filter plates is alternately distributed up and down along the axis direction of the shell and is provided with a through hole at the axis of the shell.

7. A steam circulation system for corrugated board production according to claim 1, characterized in that: The power component and the gas-liquid separation component are both connected to the main control unit by signal.

8. The steam circulation system for corrugated board production according to claim 1, characterized in that: It also includes a temperature monitoring unit, which is arranged in the paperboard drying unit and is connected to the main control unit by signal.

9. A steam circulation system for corrugated board production according to claim 1, characterized in that: The water inlet end of the heat exchange water tank is connected to the external water supply assembly through a water supply pipe, and the water outlet end is connected to the steam generating unit through a water delivery pipe.

10. A steam circulation system for corrugated board production according to claim 1, characterized in that: A liquid storage device is provided on the conveying pipeline between the power component and the gas-liquid separation component. The liquid storage device is connected to the steam generating unit through a solenoid valve. A pressure relief device is provided on one side of the liquid storage device. The pressure relief device is arranged on the conveying pipeline between the power component and the gas-liquid separation component. The solenoid valve is electrically connected to the main control unit.

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