Efficient dewatering and drying device of fourdrinier machine

Abstract

The utility model discloses an efficient dewatering and drying device of a fourdrinier machine, which comprises a net table trolley system, a closed fan cover system and a dewatering and air extracting system are respectively arranged on the upper side and the lower side of the net table trolley system, and the net table trolley system comprises a plurality of table rollers which are arranged side by side. The closed fan cover system comprises a sealing fan cover covering all the table rollers and a waste heat steam exhaust air duct communicated with the upper end of the sealing fan cover, a forming net is arranged on the table rollers, and the dehydration air exhaust system comprises air exhaust bellows arranged on the lower side of the forming net side by side. The lower end of the exhaust air bellow is communicated into a white water collecting pool below the net table trolley system through a water drainage pipeline, the water drainage pipeline is connected with an exhaust bypass pipe, the exhaust bypass pipe is connected with a vacuum pump, waste heat exhaust steam introduced into the waste heat exhaust steam air duct can be blown to wet paper pulp through a sealing fan cover to exchange heat with the wet paper pulp, the evaporation rate of water drops is increased, and the water drop evaporation efficiency is improved. And meanwhile, wet steam carrying a large amount of water drops is pumped away by the air exhaust bellows, so that the dewatering and drying efficiency of the paper sheets can be greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of papermaking process devices, in particular to a high-efficiency dehydration and drying device for a Fourdrinier papermaking machine. Background Art

[0002] As an energy and resource intensive industry, the papermaking industry generates a large amount of waste heat and exhaust steam in the entire production process, and most of the waste heat and exhaust steam generated are low-quality waste heat at low pressure and low temperature, which is difficult to recycle. In addition, the paper sheet formation of modern papermaking technology is completed on the paper machine, and the fourdrinier paper machine is a widely used type of paper machine with advantages such as rich paper varieties, but the traditional fourdrinier paper machine has a single-sided dehydration downward, and the dehydration efficiency is low. Utility Model Content

[0003] The utility model provides a high-efficiency dehydration and drying device for a Fourdrinier papermaking machine, and solves the problems that waste heat and steam in the existing papermaking process cannot be effectively utilized and the dehydration efficiency of the Fourdrinier papermaking machine is low.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-efficiency dehydration and drying device for a fourdrinier papermaking machine, comprising a net table trolley system, wherein the upper and lower sides of the net table trolley system are respectively provided with a closed air hood system and a dehydration exhaust system, wherein the net table trolley system comprises a plurality of table rollers arranged side by side, wherein the closed air hood system comprises a sealed air hood covering all the table rollers and a waste heat and exhaust steam duct connected to the upper end of the sealed air hood, wherein the table rollers are provided with a forming net, wherein the dehydration exhaust system The system includes an exhaust bellows arranged side by side at the lower side of the forming network, the lower end of the exhaust bellows is connected to the white water collection pool below the network table trolley system through a drainage pipeline, the drainage pipeline is connected to an exhaust bypass pipe, and the exhaust bypass pipe is connected to a vacuum pump. The waste heat and exhaust steam introduced into the waste heat and exhaust steam duct can be blown onto the wet pulp through a sealed wind hood to exchange heat with the wet pulp, thereby accelerating the evaporation rate of water droplets. At the same time, the exhaust bellows will extract the wet steam carrying a large number of water droplets, which can greatly improve the dehydration and drying efficiency of the paper sheets.

[0005] Preferably, the net table trolley system further comprises a table roller track, the table rollers are arranged on the table roller track and can move laterally along the table roller track, and the spacing between the table rollers can be adjusted.

[0006] Preferably, the network table trolley system further comprises a pressure measuring element, and the pressure measuring element is installed within the range covered by the exhaust bellows. The pressure measuring element can monitor the pressure within the network table trolley system in real time.

[0007] Preferably, the top of the sealed air hood is connected to the waste heat and exhaust steam air duct through at least one distributor branch pipe, and the distributor branch pipe includes an air inlet connected to the waste heat and exhaust steam air duct, an air outlet connected to the sealed air hood, and a distributor body whose cross-section gradually expands from the air inlet to the air outlet. The distributor branch pipe will rectify the waste heat and exhaust steam to ensure that the waste heat and exhaust steam can evenly blow the wet pulp on the forming screen in the running direction of the trolley.

[0008] Preferably, a pressure-regulating air valve is installed on the sealing air hood, and the pressure-regulating air valve is electrically connected to a pressure measuring element, and the required pressure can be set according to process requirements. When the actual working pressure is lower than the set pressure, the pressure measuring element will send a feedback signal to the pressure-regulating air valve, at which time the pressure-regulating air valve opens, and when the actual working pressure rises to the set pressure, the pressure-regulating air valve closes.

[0009] Preferably, the exhaust bypass pipe includes a horizontal section arranged between adjacent drainage pipes and vertical sections arranged at both ends of the horizontal section. The lower end of the vertical section is connected to the drainage pipe through a bend, and the upper end of the vertical section is connected to the horizontal section through a bend. The exhaust bypass pipe of the vertical section prevents water on the wall of the drainage pipe from flowing into the exhaust bypass pipe along the pipe wall. At the same time, water droplets carried in the gas pass through the swirling effect of the bend, and some water droplets will be adsorbed on the pipe wall under the action of centrifugal force and automatically flow downward.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] A closed hood system and a dehydration exhaust system are respectively arranged on the upper and lower sides of the net table trolley system. The sealed hood system can blow the waste heat and exhaust steam introduced into the waste heat and exhaust steam duct onto the wet pulp to exchange heat with the wet pulp, thereby accelerating the evaporation rate of water droplets. At the same time, the dehydration exhaust system extracts the wet steam carrying a large number of water droplets on the paper sheets, which can greatly improve the dehydration and drying efficiency of the paper sheets, and at the same time solves the problems of the inability to effectively utilize the waste heat and exhaust steam in the current papermaking process and the low dehydration efficiency of the fourdrinier paper machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is the overall structure diagram of the high-efficiency dehydration and drying device of the utility model;

[0013] Figure 2 It is a structural schematic diagram of the closed wind hood system of the utility model;

[0014] Figure 3 It is a partial structural diagram of the air extraction bypass pipe of the utility model;

[0015] Figure 4 It is a three-dimensional structural schematic diagram of the distributor branch pipe of the utility model.

[0016] Reference numerals:

[0017] 1. Table roller, 2. Table roller track, 3. Forming mesh, 4. Pressure measuring element, 5. Waste heat and exhaust steam air duct, 6. Distributor branch pipe, 7. Sealing air hood, 8. Pressure regulating air valve, 9. Exhaust bellows, 10. White water collection tank, 11. Vacuum pump, 12. Drainage pipeline, 13. Exhaust bypass pipe. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0019] like Figure 1-4 As shown, the utility model provides a solution to the problem that waste heat and exhaust steam in the current papermaking process cannot be effectively utilized and the dehydration efficiency of the fourdrinier paper machine is low. The utility model provides the following technical solutions: a high-efficiency dehydration and drying device for a fourdrinier papermaking machine, comprising a net table trolley system, the upper and lower sides of the net table trolley system are respectively provided with a closed air hood system and a dehydration exhaust system, the net table trolley system comprises a plurality of table rollers 1 arranged side by side, the closed air hood system comprises a sealed air hood 7 covering all the table rollers 1 and a waste heat and exhaust steam air duct 5 connected to the upper end of the sealed air hood 7, the table rollers 1 are provided with a closed air hood system, and the closed air hood system comprises a closed air hood 7 covering all the table rollers 1 and a waste heat and exhaust steam air duct 5 connected to the upper end of the sealed air hood 7. The forming net 3, the dehydration and exhaust system includes an exhaust bellows 9 arranged side by side at the lower side of the forming net 3, the lower end of the exhaust bellows 9 is connected to the white water collection pool 10 below the net table trolley system through a drainage pipeline 12, the drainage pipeline 12 is connected to an exhaust bypass pipe 13, and the exhaust bypass pipe 13 is connected to a vacuum pump 11. The waste heat and exhaust steam introduced into the waste heat and exhaust steam duct 5 can be blown onto the wet pulp through the sealed wind hood 7 to exchange heat with the wet pulp, thereby accelerating the evaporation rate of water droplets. At the same time, the exhaust bellows 9 will extract the wet steam carrying a large number of water droplets, which can greatly improve the dehydration and drying efficiency of the paper sheets.

[0020] Specifically, the waste heat exhaust steam duct 5 can be directly connected to the device that generates waste heat exhaust steam in the process line, or it can be connected to other devices that have used waste heat exhaust steam to recycle the waste heat exhaust steam. The forming net 3 is circulated along the table roller 1, and the wet pulp is laid on the upper side of the forming net 3. The table roller 1 is pulled by a motor drive device. In order to adjust the spacing between the table rollers 1, the net table trolley system also includes a table roller track 2. The table roller 1 is set on the table roller track 2 and can move laterally along the table roller track 2. The spacing between the table rollers 1 can be adjusted according to the process requirements.

[0021] The exhaust bypass pipe 13 can provide negative pressure suction power to the exhaust bellows 9, mainly to extract the moist hot steam, and the liquid water on the exhaust bellows 9 and the side wall of the pipeline will automatically flow into the white water collection tank 10 under the action of gravity.

[0022] In this embodiment, the net table trolley system also includes a pressure measuring element 4, which is installed within the range covered by the exhaust bellows 9. The pressure measuring element 4 can monitor the pressure inside the net table trolley system in real time. In order to realize automatic adjustment and control of the air pressure inside the net table trolley system, a pressure regulating air valve 8 is installed on the sealing wind hood 7. The pressure regulating air valve 8 is electrically connected to the pressure measuring element 4, and the required pressure can be set according to process requirements. When the actual working pressure is lower than the set pressure, the pressure measuring element 4 will send a feedback signal to the pressure regulating air valve 8. At this time, the pressure regulating air valve 8 is opened, and when the actual working pressure rises to the set pressure, the pressure regulating air valve 8 is closed.

[0023] In this embodiment, the top of the sealed air hood 7 is connected to the waste heat and exhaust steam air duct 5 through at least one distributor branch pipe 6. The distributor branch pipe 6 includes an air inlet connected to the waste heat and exhaust steam air duct 5, an air outlet connected to the sealed air hood 7, and a distributor body whose cross-section gradually expands from the air inlet to the air outlet. The distributor branch pipe 6 will rectify the waste heat and exhaust steam to ensure that the waste heat and exhaust steam can evenly blow the wet pulp on the forming network in the running direction of the trolley.

[0024] In this embodiment, the exhaust bypass pipe 13 includes a horizontal section arranged between adjacent drainage pipes 12 and vertical sections arranged at both ends of the horizontal section. The lower end of the vertical section is connected to the drainage pipe 12 through a bend, and the upper end of the vertical section is connected to the horizontal section through a bend. The vertical section of the exhaust bypass pipe 13 can prevent water on the wall of the drainage pipe from flowing into the exhaust bypass pipe 13 along the pipe wall. At the same time, water droplets carried in the gas pass through the swirling effect of the bend, and some water droplets will be adsorbed on the pipe wall under the action of centrifugal force, and automatically flow downward and gather into the white water collection pool 10.

[0025] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0026] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A high-efficiency dehydration and drying device for a Fourdrinier papermaking machine, characterized in that: The invention comprises a net table trolley system, wherein the upper and lower sides of the net table trolley system are respectively provided with a closed wind hood system and a dehydration exhaust system, wherein the net table trolley system comprises a plurality of table rollers (1) arranged side by side, wherein the closed wind hood system comprises a sealed wind hood (7) covering all the table rollers (1) and a waste heat and exhaust steam air duct (5) connected to the upper end of the sealed wind hood (7), wherein the table rollers (1) are provided with a forming net (3), wherein the dehydration exhaust system comprises an exhaust bellows (9) arranged side by side at the lower side of the forming net (3), wherein the lower end of the exhaust bellows (9) is connected to a white water collection pool (10) below the net table trolley system through a drainage pipeline (12), wherein the drainage pipeline (12) is connected to an exhaust bypass pipe (13), and the exhaust bypass pipe (13) is connected to a vacuum pump (11).

2. The high-efficiency dehydration and drying device for a Fourdrinier papermaking machine according to claim 1, characterized in that: The net table trolley system further comprises a table roller track (2), and the table roller (1) is arranged on the table roller track (2) and can move laterally along the table roller track (2).

3. The high-efficiency dehydration and drying device for a Fourdrinier papermaking machine according to claim 1, characterized in that: The net table trolley system further comprises a pressure measuring element (4), and the pressure measuring element (4) is installed within the range covered by the exhaust bellows (9).

4. The high-efficiency dehydration and drying device for a Fourdrinier papermaking machine according to claim 1, characterized in that: The top of the sealed air hood (7) is connected to the waste heat and exhaust steam air duct (5) through at least one distributor branch pipe (6), and the distributor branch pipe (6) comprises an air inlet connected to the waste heat and exhaust steam air duct (5), an air outlet connected to the sealed air hood (7), and a distributor body whose cross section gradually expands from the air inlet to the air outlet.

5. The high-efficiency dehydration and drying device for a Fourdrinier papermaking machine according to claim 3, characterized in that: A pressure regulating air valve (8) is installed on the sealing air hood (7), and the pressure regulating air valve (8) is electrically connected to the pressure measuring element (4).

6. The high-efficiency dehydration and drying device for a Fourdrinier papermaking machine according to claim 1, characterized in that: The exhaust bypass pipe (13) comprises a horizontal section arranged between adjacent drainage pipelines (12) and vertical sections arranged at both ends of the horizontal section, the lower end of the vertical section is connected to the drainage pipeline (12) through a bend, and the upper end of the vertical section is connected to the horizontal section through a bend.

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