Low-energy-consumption hot air balance system for toilet paper drying
By setting up a hot air hood and steam system on the paper machine, and using a condensate gas buffer tank to recover heat energy, the problem of high energy consumption during the drying process is solved, the recycling of heat energy is realized, and production costs are reduced.
Patent Information
- Application Number
- CN202421742344.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-22
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-07-22
AI Technical Summary
During the existing toilet paper making process, the hot air energy consumption required for drying is large, resulting in high production costs.
A low-energy hot air balance system is designed. By setting up a hot air hood and steam system on the drying cylinder, the condensate gas buffer tank is used to recover the thermal energy of the condensate gas and use it to heat fresh air. Combined with steam recovery and heat exchanger, the thermal energy recycling is realized.
It effectively reduces the energy consumption of the drying process and reduces the production costs of the enterprise.
Smart Images
Figure CN223150924U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of toilet paper papermaking equipment, and particularly relates to a low-energy-consumption hot air balance system for drying toilet paper. Background Art
[0002] The principle of papermaking in a toilet paper papermaking machine is to evenly distribute pulp onto a washing and grinding cloth, and squeeze out moisture through heating, pressure and other means to finally form paper. Its papermaking process includes basic steps such as paper feeding, pulp distribution, dehydration, pressing, drying, calendering, and paper winding. Its drying process is that the washing and grinding cloth with pulp enters a drying cylinder to achieve the purpose of drying. In order to make the drying temperature more uniform, generally, hot steam is passed inside the drying cylinder and hot air is passed outside the drying cylinder.
[0003] The hot air used in an ordinary drying cylinder is basically prepared by heating fresh air with a hot air blower, and then the hot air is sent to the drying cylinder by an exhaust fan. Since the energy consumption for generating hot air is relatively large and the production cost is relatively high. How to utilize the heat energy in the papermaking process and reduce the energy consumption required for the drying process has become an urgent technical problem in this field. Summary of the Invention
[0004] The purpose of the utility model is to solve the deficiencies of the prior art and provide a low-energy-consumption hot air balance system for drying toilet paper.
[0005] The technical solution adopted by the utility model is: a low-energy-consumption hot air balance system for drying toilet paper, comprising:
[0006] A drying cylinder, which is rotatably arranged on a papermaking machine;
[0007] A hot air hood, which is sleeved above the drying cylinder;
[0008] A hot air system, which includes a heat exchanger, a hot air blower and an exhaust fan connected in sequence through a hot air pipeline, and the hot air generated by the hot air system passes through the hot air hood and then is discharged; and,
[0009] A steam system, which includes a steam pipeline connected to the drying cylinder and a condensate water buffer tank for storing condensate water; the top of the condensate water buffer tank is connected to a steam recovery pipeline, and the bottom is connected to the heat exchanger of the hot air system through a condensate water pipeline; steam enters the drying cylinder through the steam pipeline and is stored in the condensate water buffer tank, the hot steam inside the condensate water buffer tank is connected to the steam pipeline or emptied through the steam recovery pipeline, and its condensate water is discharged after recovering heat through the heat exchanger via the condensate water pipeline.
[0010] Preferably, the part of the hot air hood close to the paper feeding end is the wet part, and the part close to the paper discharging end is the dry part; both the dry part and the wet part are provided with hot air inlets and outlets.
[0011] Preferably, a first air inlet and a first air outlet are provided in the wet part.
[0012] Preferably, a second air inlet, a third air inlet and a second air outlet are provided in the dry part. The second air inlet is arranged at the upper end inside the dry part, and the third air inlet is located at the lower end inside the dry part.
[0013] Preferably, the steam pipeline includes a steam input pipe and a steam output pipe. One end of the dryer cylinder is communicated with the steam input pipe, and the other end is communicated with the steam output pipe; the other end of the steam output pipe is connected to the lower part of the condensate water and gas buffer tank.
[0014] Preferably, two parallel water pumps are provided on the condensate water pipeline.
[0015] Preferably, the output end of the steam recovery pipeline is connected to the steam pipeline and the evacuation pipeline.
[0016] Preferably, the air inlet end of the steam input pipe is connected with a steam main pipeline and a steam bypass pipeline, and the steam bypass pipeline is connected with the steam recovery pipeline.
[0017] Preferably, pipeline temperature monitors are provided on the steam pipeline, the steam recovery pipeline, the condensate water pipeline and the hot air pipeline.
[0018] Preferably, a steam temperature detector and a condensate water temperature detector are respectively arranged at the top and bottom of the condensate water and gas buffer tank.
[0019] Preferably, the heat exchanger of the hot air system is connected with a collection tank.
[0020] The utility model has the following advantages compared with the prior art:
[0021] The hot air balance system of the utility model stores the condensate water and gas mixture formed by pre-cooling the steam after passing through the dryer cylinder in the condensate water and gas buffer tank, and recovers and utilizes the heat energy of the condensate water and gas mixture. The liquid with a higher temperature in the condensate water and gas buffer tank is used to recover heat through the heat exchanger for heating fresh air; in addition, when the steam temperature in the condensate water and gas buffer tank is still relatively high, it will be recovered through the steam recovery pipeline to the steam pipeline for reuse. This design can make full use of the heat energy in the papermaking process, reduce the energy consumption required in the drying process, and greatly reduce the production cost of the enterprise. Description of the Drawings
[0022] Figure 1 is the schematic principle structure diagram of the utility model.
[0023] Figure 2 is the schematic principle structure diagram of the hot air system.
[0024] The reference numerals in the figure are shown as follows:
[0025] 1 - drying cylinder, 11 - inner cavity, 2 - hot air hood, 21 - wet part, 211 - first air inlet, 212 - first air outlet, 22 - dry part, 221 - second air inlet, 222 - third air inlet, 223 - second air outlet, 3 - hot air system, 31 - hot air pipeline, 32 - heat exchanger, 33 - hot air blower, 34 - exhaust fan, 4 - steam system, 41 - steam pipeline, 411 - steam input pipe, 412 - steam output pipe, 413 - steam main pipeline, 414 - steam bypass pipeline, 415 - pneumatic three - way valve, 42 - condensate water buffer tank, 421 - steam temperature detector, 422 - condensate water temperature detector, 43 - steam recovery pipeline, 44 - condensate water pipeline, 45 - drain pipeline, 46 - water pump, 47 - collection pool. Specific embodiments
[0026] To deepen the understanding of the present utility model, the present utility model will be further described in detail below in conjunction with the embodiments and the drawings. The present utility model can be implemented in the following manner:
[0027] Refer to Figure 1-2 , a low - energy - consumption hot - air balance system for drying toilet paper, comprising a drying cylinder 1, a hot air hood 2, a hot air system 3 and a steam system 4.
[0028] Among them, the drying cylinder 1 is rotatably arranged on a paper machine. The drying cylinder 1 is cylindrical, and an inner cavity 11 for accommodating the steam of the steam system 4 is formed inside it. The hot air hood 2 is sleeved above the drying cylinder 1; the part of the hot air hood 2 close to the paper - feeding end is the wet part 21, and the part close to the paper - discharging end is the dry part 22; both the dry part 22 and the wet part 21 are provided with hot - air inlets and outlets. Specifically, the wet part 21 is provided with a first air inlet 211 and a first air outlet 212. The dry part 22 is provided with a second air inlet 221, a third air inlet 222 and a second air outlet 223. The second air inlet 221 is arranged at the upper end inside the dry part 22, and the third air inlet 222 is located at the lower end inside the dry part 22. By arranging the second air inlet 221 and the third air inlet 222 at different positions of the dry part 22, the uniformity of the drying temperature can be improved.
[0029] The described hot air system 3 includes a heat exchanger 32, a hot air blower 33, and an exhaust fan 34 connected in sequence through a hot air pipeline 31. Before the hot air passes through the heat exchanger 32, it is dust-removed to avoid contaminating the toilet paper. The hot air generated by the hot air system 3 passes through the hot air hood 2 and then is discharged. Specifically, the hot air of the hot air system 3 enters the hot air hood 2 through the first air inlet 211, the second air inlet 221, and the third air inlet 222 respectively through the hot air pipeline 31, and then the exhaust fan 34 discharges the hot air from the hot air hood 2 through the first air outlet 212 and the second air outlet 223.
[0030] The described steam system 4 includes a steam pipeline 41 connected to the drying cylinder 1 and a condensate buffer tank 42 for storing condensate water vapor; the top of the condensate buffer tank 42 is connected to a steam recovery pipeline 43, and the bottom is connected to the heat exchanger 32 of the hot air system 3 through a condensate pipeline 44; steam enters the drying cylinder 1 through the steam pipeline 41 and is stored in the condensate buffer tank 42. The hot steam inside the condensate buffer tank 42 is connected to the steam pipeline 41 through the steam recovery pipeline 43 for recovery or evacuation, and its condensate water is discharged after recovering heat through the heat exchanger 32 via the condensate pipeline 44.
[0031] Specifically, the steam pipeline 41 includes a steam input pipe 411 and a steam output pipe 412. One end of the drying cylinder 1 is communicated with the steam input pipe 411, and the other end is communicated with the steam output pipe 412; the other end of the steam output pipe 412 is connected to the lower part of the condensate buffer tank 42. Steam enters the drying cylinder 1 from the steam input pipe 411, and then the formed condensate water vapor enters the condensate buffer tank 42 through the steam output pipe 412.
[0032] The output end of the steam recovery pipeline 43 is connected to the steam pipeline 41 and an evacuation pipeline 45. The intake end of the steam input pipe 411 is connected with a steam main pipeline 413 and a steam bypass pipeline 414, and the steam bypass pipeline 414 is connected to the steam recovery pipeline 43. A pneumatic three-way valve 415 is arranged at the connection of the steam bypass pipeline 414 and the steam recovery pipeline 43. A steam temperature detector 421 and a condensate water temperature detector 422 are respectively arranged at the top and bottom of the condensate buffer tank 42. When the steam temperature detector 421 at the top of the condensate buffer tank 42 detects that the temperature of the steam in the condensate buffer tank 42 is still relatively high, the steam in the condensate buffer tank 42 will be recovered to the steam bypass pipeline 414 through the steam recovery pipeline 43 for reuse; when the temperature of the steam in the condensate buffer tank 42 is relatively low, it is discharged outward through the evacuation pipeline 45 via the steam recovery pipeline 43.
[0033] Two parallel pumps 46 are provided on the condensate water pipeline 44. The heat exchanger 32 of the hot air system 3 is connected to a collection tank 47. The liquid with a relatively high temperature in the condensate water and gas buffer tank 42 enters the heat exchanger 32 through the pump 46 on the condensate water pipeline 44, and the heat exchanger 32 recovers the heat of the high-temperature liquid for heating fresh air. This design can make full use of the thermal energy in the papermaking process, reduce the energy consumption required for the drying process, and greatly reduce the production cost of the enterprise.
[0034] Pipeline temperature monitors are provided on the steam pipeline 41, the steam recovery pipeline 43, the condensate water pipeline 44 and the hot air pipeline 31 to monitor the temperature of each link in the entire hot air balance system at any time and feed the data back to the central control system. Corresponding valves, switch components and other parts are also provided on each pipeline, which will not be elaborated here.
[0035] Working principle: At the beginning of the drying operation, steam first enters the drying cylinder 1 through the steam pipeline 41 for cylinder warming; after the cylinder warming is completed, the hot air system 3 is started, and the hot air generated by the hot air blower 33 enters the hot air hood 2 through the hot air pipeline 31. The abrasive cloth with pulp on the paper machine enters from the paper feeding end between the drying cylinder 1 and the hot air hood 2, and then exits from the paper discharging end between the drying cylinder 1 and the hot air hood 2. During the drying operation, part of the steam in the drying cylinder 1 will be cooled to form condensate water, and the condensate water and gas in the drying cylinder 1 are stored in the condensate water and gas buffer tank 42. When the steam temperature detector 421 at the top of the condensate water and gas buffer tank 42 detects that the temperature of the steam in the condensate water and gas buffer tank 42 is still relatively high, the steam in the condensate water and gas buffer tank 42 will be recovered through the steam recovery pipeline 43 to the steam bypass pipeline 414 for reuse; when the temperature of the steam in the condensate water and gas buffer tank 42 is relatively low, it is discharged outward through the steam recovery pipeline 43 via the exhaust pipeline 45. The liquid with a relatively high temperature in the condensate water and gas buffer tank 42 enters the heat exchanger 32 through the pump 46 on the condensate water pipeline 44, and the heat exchanger 32 recovers the heat of the high-temperature liquid for heating fresh air. The liquid whose heat has been recovered by the heat exchanger 32 is finally discharged into the collection tank 47.
[0036] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A low-energy hot air balance system for drying toilet paper, characterized in that, Comprising: A dryer cylinder (1), which is rotatably arranged on a paper machine; A hot air hood (2), which is sleeved above the dryer cylinder (1); A hot air system (3), which includes a heat exchanger (32), a hot air blower (33), and an exhaust fan (34) connected in sequence through a hot air pipeline (31). The hot air generated by the hot air system (3) passes through the hot air hood (2) and then is discharged; and, A steam system (4), which includes a steam pipeline (41) communicated with the dryer cylinder (1) and a condensate water buffer tank (42) for storing condensate water vapor. The top of the condensate water buffer tank (42) is connected to a steam recovery pipeline (43), and the bottom is connected to the heat exchanger (32) of the hot air system (3) through a condensate water pipeline (44).
2. The low - energy hot - air balance system for drying toilet paper according to claim 1, wherein, The part of the hot air hood (2) close to the paper feeding end is the wet part (21), and the part close to the paper discharging end is the dry part (22). Both the dry part (22) and the wet part (21) are provided with hot air inlets and outlets.
3. A low-energy hot air balance system for drying toilet paper according to claim 2, characterized in that, The wet part (21) is provided with a first air inlet (211) and a first air outlet (212).
4. A low-energy hot air balance system for drying toilet paper according to claim 3, characterized in that, The dry part (22) is provided with a second air inlet (221), a third air inlet (222), and a second air outlet (223). The second air inlet (221) is arranged at the upper end inside the dry part (22), and the third air inlet (222) is located at the lower end inside the dry part (22).
5. A low-energy hot air balance system for drying toilet paper according to any one of claims 1-4, characterized in that, The steam pipeline (41) includes a steam input pipe (411) and a steam output pipe (412). One end of the dryer cylinder (1) is communicated with the steam input pipe (411), and the other end is communicated with the steam output pipe (412). The other end of the steam output pipe (412) is connected to the lower part of the condensate water buffer tank (42).
6. The low - energy consumption hot - air balance system for toilet paper drying according to claim 1, characterized in that, Two parallel water pumps (46) are arranged on the condensate water pipeline (44).
7. A low-energy hot air balance system for drying toilet paper according to claim 5, characterized in that, The output end of the steam recovery pipeline (43) is connected to the steam pipeline (41) and an exhaust pipeline (45).
8. A low-energy hot air balance system for drying toilet paper according to claim 5, characterized in that, The air inlet end of the steam input pipe (411) is connected to a steam main pipeline (413) and a steam bypass pipeline (414), and the steam bypass pipeline (414) is connected to the steam recovery pipeline (43).
9. A low-energy hot air balance system for drying toilet paper according to claim 1 or 2 or 3 or 4 or 6 or 7 or 8, characterized in that, Pipeline temperature monitors are arranged on the steam pipeline (41), the steam recovery pipeline (43), the condensate water pipeline (44), and the hot air pipeline (31). A steam temperature detector (421) and a condensate water temperature detector (422) are respectively arranged at the top and bottom of the condensate water buffer tank (42).
10. A low-energy hot air balance system for drying toilet paper according to claim 1 or 2 or 3 or 4 or 6 or 7 or 8, characterized in that, A collection pool (47) is connected to the heat exchanger (32) of the hot air system (3).