Steam condensate water system of drying part of paper machine

Abstract

The utility model relates to a steam condensate water system of a drying part of a paper machine. The steam condensate water system comprises main steam heating output equipment, a steam main pipeline, a heat recovery assembly and a plurality of heating pumps. When the steam condensate water system for the drying part of the paper machine is operated, steam is continuously conveyed through the main steam heating output equipment and then is respectively conveyed into the drying cylinders through the heating pumps, and the steam output in the drying cylinders is arranged in the independent steam-water separators for steam-water separation. Secondary steam of an independent steam-water separator can be gathered into the heating pump to be heated again, and the using amount ratio of the fresh steam to the secondary steam is adjusted through transmission of the heating pump, so that it is guaranteed that the overall steam using amount of the paper machine reaches the optimal level; and the water and the rest secondary steam are converged into the heat recovery assembly through the main steam-water separator to be heated again to the specified temperature and then transmitted, so that it can be ensured that part of the secondary steam returns to the heating system, and the rest secondary steam is fully recycled.

Description

Technical Field

[0001] The utility model belongs to the technical field of papermaking, and in particular relates to a steam condensate system of a drying section of a paper machine. Background Art

[0002] During the papermaking process, the paper needs to be dried. The working principle of the drying section is: "The saturated steam introduced from the steam joint condenses inside the drying cylinder, and the heat released causes the temperature of the drying cylinder to rise, thereby heating the paper sheet wrapped on the surface of the roller shell. The heat is transferred to the paper during the contact between the paper and the surface of the drying cylinder." In this process, the condensed water can absorb part of the heat in the steam. At present, some companies will directly recycle the condensed water and then converge it into high-pressure steam in order to reduce resource waste, as recorded in Fang Ming's patent published in patent publication number CN108130785. However, after experiments, it was found that this method of recovering the heat from condensed water would have some problems. The secondary steam of the condensed water is directly returned to the heating system. Since the temperature of the secondary steam is not high enough, the stability of the heating system will be reduced, resulting in incomplete drying of the paper, which will affect the quality of paper production to a certain extent. Utility Model Content

[0003] In view of the deficiencies of the prior art, the technical problem to be solved by the utility model is to provide a steam condensate system for the drying section of a paper machine, which can ensure that part of the secondary steam returns to the heating system and the rest of the secondary steam is fully recycled.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a steam condensate system for the drying section of a paper machine, comprising a main steam heating and outputting device, a steam main pipeline, a heat recovery component, a plurality of heating pumps, a plurality of drying cylinders and a plurality of separate steam-water separators, wherein the input end of the steam main pipeline is connected to the main steam heating and outputting device, and the output end of the steam main pipeline is connected to the heat recovery component, the plurality of heating pumps are installed on the steam main pipeline and connected to the steam main pipeline, the plurality of drying cylinders are respectively connected to the plurality of heating pumps, the plurality of separate steam-water separators are respectively connected to the plurality of drying cylinders, and the heat recovery component is provided with a total steam-water separator connected to the plurality of separate steam-water separators.

[0005] The drying cylinder is provided with steam inlets at both corresponding ends, and both steam inlets are connected to the output end of the heating pump. The top of the drying cylinder is provided with an air outlet pipe connected to a separate steam-water separator, and the air outlet pipe is located in the middle of the top of the drying cylinder.

[0006] The inner walls on the corresponding sides of the drying cylinder are provided with a plurality of water collecting plates, and the plurality of water collecting plates are arranged equidistantly along the axial direction of the steam inlet.

[0007] A drainage groove is provided at the bottom of the drying cylinder, and a drainage pipe communicating with a separate steam-water separator is provided at the bottom of the drainage groove.

[0008] An air guide plate is arranged on the drainage groove, and the air guide plate is inclined from high to low in the direction of the steam inlet on both sides with the position corresponding to the air outlet pipe as the starting point.

[0009] The cylinder wall of the drying cylinder is provided with heat-insulating material.

[0010] Compared with the prior art, the utility model has the following beneficial effects:

[0011] The utility model discloses a steam condensate system for the drying section of a paper machine. When in operation, steam is continuously conveyed by a main steam heating output device, and then is transmitted and placed in a plurality of drying cylinders through a plurality of heating pumps. The steam output in the drying cylinder is placed in a separate steam-water separator for steam-water separation. The secondary steam in the separate steam-water separator is introduced into the heating pump for reheating. The usage ratio of the fresh steam and the secondary steam is adjusted through the transmission of the heating pump to ensure that the overall steam usage of the paper machine reaches an optimal level. Water and the remaining secondary steam are introduced into a heat recovery component through the total steam-water separator to be reheated to a specified temperature and then transmitted, thereby ensuring that part of the secondary steam returns to the heating system and the remaining secondary steam is fully recycled. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the structure of the steam condensate system of the drying section of a paper machine of the utility model;

[0013] Figure 2 It is a schematic diagram of the internal structure of the drying cylinder of the utility model.

[0014] Markings in the figure: 1. Main steam heating output delivery equipment; 2. Steam main pipeline; 3. Heat recovery component; 4. Heating pump; 5. Drying cylinder; 6. Separate steam-water separator; 7. Main steam-water separator; 8. Steam inlet; 9. Air outlet pipe; 10. Water collecting plate; 11. Drain trough; 12. Drain pipe; 13. Air guide plate. DETAILED DESCRIPTION

[0015] In order to make the above features and advantages of the present invention more obvious and understandable, embodiments are given below with reference to the accompanying drawings for detailed description as follows.

[0016] like Figure 1As shown, the present embodiment provides a steam condensate system for the drying section of a paper machine, comprising a main steam heating and outputting device 1, a steam main pipeline 2, a heat recovery component 3, a plurality of heating pumps 4, a plurality of drying cylinders 5 and a plurality of separate steam-water separators 6, wherein the input end of the steam main pipeline 2 is connected to the main steam heating and outputting device 1, and the output end of the steam main pipeline 2 is connected to the heat recovery component 3, the plurality of heating pumps 4 are all installed on the steam main pipeline 2 and connected to the steam main pipeline 2, the plurality of drying cylinders 5 are respectively connected to the plurality of heating pumps 4 correspondingly, the plurality of separate steam-water separators 6 are respectively connected to the plurality of drying cylinders 5 correspondingly, and the heat recovery component 3 is provided with a total steam-water separator 7 connected to the plurality of separate steam-water separators 6. During operation, the main steam heating output device 1 is used to continuously deliver steam, and then the steam is transmitted to multiple drying cylinders 5 through multiple heating pumps 4, and the steam output in the drying cylinder 5 is placed in a separate steam-water separator 6 for steam-water separation, and the secondary steam of the separate steam-water separator 6 will be collected in the heating pump 4 for reheating, and the usage ratio of fresh steam and secondary steam is adjusted through the transmission of the heating pump 4 to ensure that the overall steam consumption of the paper machine reaches the optimal level, and water and the remaining secondary steam are collected in the heat recovery component 3 through the total steam-water separator 7 to be reheated to the specified temperature and then transmitted, thereby ensuring that part of the secondary steam returns to the heating system and the remaining secondary steam is fully recycled.

[0017] Furthermore, the drying cylinder 5 is provided with steam inlets 8 at the corresponding two ends, and the two steam inlets 8 are both connected to the output end of the heating pump 4. The top of the drying cylinder 5 is provided with an air outlet pipe 9 connected to the separate steam-water separator 6, and the air outlet pipe 9 is located in the middle of the top of the drying cylinder 5. The air intake at both ends allows the steam to quickly fill the entire drying cylinder 5, and prevents the steam temperature at the output end from being lower than the steam temperature at the inlet end when the drying cylinder 5 is too long, thereby preventing uneven drying.

[0018] Furthermore, a plurality of water collecting plates 10 are provided on the inner walls of the corresponding two sides of the drying cylinder 5, and the plurality of water collecting plates 10 are arranged equidistantly along the axial direction of the steam inlet 8. Specifically, a drainage groove 11 is provided at the bottom of the drying cylinder 5, and a drainage pipe 12 connected to the separate steam-water separator 6 is provided at the bottom of the drainage groove 11. Water is collected and drained by the cooperation of the drainage groove 11 and the plurality of water collecting plates 10 to prevent excessive moisture in the cylinder.

[0019] Furthermore, an air guide plate 13 is provided on the drainage groove 11, and the air guide plate 13 is inclined from high to low in the direction of the steam inlet 8 on both sides starting from the position corresponding to the air outlet pipe 9. The air guide plate 13 prevents excessive steam from entering the drainage groove 11 and preventing steam from being lost.

[0020] Furthermore, a heat-insulating material is provided inside the cylinder wall of the drying cylinder 5 to increase the heat-insulating performance of the drying cylinder 5 .

[0021] The above shows and describes the basic principles and main features of the invention and the advantages of the invention. Those skilled in the art should understand that the invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the invention. Without departing from the spirit and scope of the invention, the invention may have various changes and improvements, which shall fall within the scope of the invention to be protected. The scope of protection of the invention shall be defined by the attached claims and their equivalents.

Claims

1. A steam condensate system for the drying section of a paper machine, characterized in that: It includes a main steam heating and outputting device, a steam main pipeline, a heat recovery component, multiple heating pumps, multiple drying cylinders and multiple individual steam-water separators. The input end of the steam main pipeline is connected to the main steam heating and outputting device, and the output end of the steam main pipeline is connected to the heat recovery component. The multiple heating pumps are installed on the steam main pipeline and connected to the steam main pipeline. The multiple drying cylinders are respectively connected to the multiple heating pumps. The multiple individual steam-water separators are respectively connected to the multiple drying cylinders. The heat recovery component is provided with a total steam-water separator connected to the multiple individual steam-water separators.

2. A steam condensate system for a paper machine drying section according to claim 1, characterized in that: The drying cylinder is provided with steam inlets at both corresponding ends, and both steam inlets are connected to the output end of the heating pump. The top of the drying cylinder is provided with an air outlet pipe connected to a separate steam-water separator, and the air outlet pipe is located in the middle of the top of the drying cylinder.

3. A paper machine drying section steam condensate system according to claim 2, characterized in that: The inner walls on the corresponding sides of the drying cylinder are provided with a plurality of water collecting plates, and the plurality of water collecting plates are arranged equidistantly along the axial direction of the steam inlet.

4. A steam condensate system for a paper machine drying section according to claim 2, characterized in that: A drainage groove is provided at the bottom of the drying cylinder, and a drainage pipe communicating with a separate steam-water separator is provided at the bottom of the drainage groove.

5. A steam condensate system for the drying section of a paper machine according to claim 4, characterized in that: An air guide plate is arranged on the drainage groove, and the air guide plate is inclined from high to low in the direction of the steam inlet on both sides with the position corresponding to the air outlet pipe as the starting point.

6. The steam condensate system for the drying section of a paper machine according to claim 1, characterized in that: The cylinder wall of the drying cylinder is provided with heat-insulating material.

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