Condensate water recycling system of tobacco flake redrying machine

Abstract

The utility model discloses a condensed water recycling system of a tobacco flake redrying machine, which comprises a control device, a high-pressure steam pipeline, a water inlet pipe and a water outlet pipe, the input ends of the heat exchangers are communicated and connected with the high-pressure steam pipeline through a first connecting header pipe; the input end of the condensate water gathering pipe is respectively communicated and connected with the output ends of the plurality of heat exchangers; the water storage tank is communicated and connected with the output end of the condensate water gathering pipe; the input end of the low-pressure steam pipe is communicated with the water storage tank, and the output end of the low-pressure steam pipe is connected with an ejector; the input end of the second connecting header pipe is communicated with the high-pressure steam pipeline, and the output end of the second connecting header pipe is connected with the ejector; a medium pressure steam pipe; and the direct injection steam pipeline is connected with a first control valve. Secondary steam generated by high-temperature condensate water storage is fully utilized, the steam consumption of a direct injection steam pipeline in the moisture regain process of the tobacco flake redrying machine is reduced, recycling of the secondary steam of the high-temperature condensate water is achieved, and the purpose of saving energy is achieved.

Description

Technical Field

[0001] The utility model relates to a recycling system, in particular to a condensed water recycling system for a tobacco sheet redrying machine, belonging to the technical field of tobacco equipment. Background Art

[0002] Generally speaking, in the tobacco leaf threshing and redrying production line used in the tobacco industry, the steam in the drying area forms a large amount of high-temperature condensed water after heat exchange through the heater. The redrying plant sends the condensed water back to the boiler room for heating and vaporization into steam for reuse. During the recycling and transportation of condensed water, due to the high temperature and long distance, the amount of heat energy lost along the way is large, resulting in a huge waste of energy. The original tobacco leaf redrying machine rehumidification area direct injection steam pipeline only has high-pressure steam pipeline to supply steam, and the energy consumption is relatively high.

[0003] After searching for novelties, it is found that there are currently two patents for the recovery and utilization of condensed water from tobacco slice redrying machines: one of which is a Chinese utility model patent with application number CN201320140633.3, which discloses a "waste heat recovery device for high-temperature condensed water from tobacco slice redrying machines". The patent describes the recovery of high-temperature condensed water produced by the steam heat exchanger in the front box of the drying area for use in the first heat exchanger in the rear box of the drying area, which can replace part of the steam to provide a heat source for heating the circulating air, thereby achieving the purpose of reducing steam energy consumption.

[0004] However, the above patents still have technical defects and shortcomings: the heat contained in the high-temperature condensate generated by the steam heat exchanger in the drying area box is not fully utilized, and the condensate is easily generated due to pressure changes during the recycling process. The secondary steam and condensate are mixed in the pipeline and are prone to water hammer phenomenon, noise, vibration, shock waves, etc., which cause serious damage to the pipeline and lead to pipeline leakage and other problems.

[0005] Another Chinese utility model patent with application number CN202222781064.2 discloses "a tobacco leaf redrying and rehumidification energy-saving system based on condensate water recycling". The patent describes the recovery of high-temperature condensate produced by the steam heat exchanger in the drying area and sending it to a constant temperature water tank. The outlet pipe of the constant temperature water tank is sent to the rehumidification area and the compressed air pipe through the atomizing nozzle to form atomized water to humidify the material in the rehumidification area, thereby achieving the purpose of reducing energy consumption.

[0006] However, the above patents still have technical defects and shortcomings: the heat contained in the high-temperature condensed water generated by the steam heat exchanger in the drying area box is not fully utilized. Since the amount of high-temperature condensed water generated in the drying area is large, the high-temperature condensed water is sent to the constant temperature water tank in the rehumidification area, and then mixed with cold water to form constant temperature water. The amount of constant temperature water is limited. In this case, the reuse amount of high-temperature condensed water is low, and a large amount of high-temperature condensed water heat energy has not been effectively reused, and the utilization rate is low.

[0007] Here, a condensate recycling system for a tobacco slice redrying machine is proposed. The high-temperature condensate in the drying area of ​​the tobacco slice redrying machine is recycled to a water storage tank. High-pressure steam is used for extraction to extract the low-pressure secondary steam generated by the high-temperature condensate in the water storage tank. The two are mixed to form medium-pressure steam, which is reused in the direct injection steam pipeline in the rehumidification area to increase the temperature and humidify the materials, thereby achieving the purpose of reducing the steam energy consumption of the equipment.

[0008] Therefore, the key to solving the above technical problems is to develop a reasonably designed, stable and reliable condensate recovery and utilization system for tobacco slice redrying machines. Summary of the invention

[0009] In view of the many defects and shortcomings existing in the above-mentioned background technology, the present utility model has made improvements and innovations thereon, with the aim of providing a safe, reliable and easy-to-operate condensate water recovery and utilization system for a tobacco slice re-drying machine, which can make full use of the secondary steam generated by the high-temperature condensate water storage, reduce the steam consumption of the direct injection steam pipeline during the rehumidification process of the tobacco slice re-drying machine, realize the recovery and utilization of the secondary steam of the high-temperature condensate water, and achieve the purpose of energy saving.

[0010] Another invention purpose of the utility model is to reduce manual intervention, improve work efficiency, and achieve intelligent energy-saving control.

[0011] In order to solve the above problems and achieve the above invention objectives, the utility model is a condensate water recycling system for a tobacco sheet redrying machine, which is realized by adopting the following design structure and the following technical solutions:

[0012] A condensed water recycling system for a tobacco sheet redrying machine, comprising a control device, and further comprising:

[0013] High-pressure steam pipeline (1);

[0014] A plurality of heat exchangers (3), wherein the plurality of heat exchangers (3) are arranged in the drying area (2), and the input ends of the plurality of heat exchangers (3) are connected to the high-pressure steam pipeline (1) via a first connecting main pipe (15);

[0015] A condensed water collecting pipe (4), the input end of which is connected to the output ends of the plurality of heat exchangers (3);

[0016] A water storage tank (5), the water storage tank (5) is connected to the output end of the condensed water collecting pipe (4);

[0017] A low-pressure steam pipe (8), wherein the input end of the low-pressure steam pipe (8) is connected to the water storage tank (5), and the output end of the low-pressure steam pipe (8) is connected to an ejector (10);

[0018] A second connecting main pipe (16), the input end of the second connecting main pipe (16) being communicated with the high-pressure steam pipeline (1), and the output end of the second connecting main pipe (16) being connected with the ejector (10);

[0019] A medium-pressure steam pipe (11), the input end of the medium-pressure steam pipe (11) is connected to the output end of the ejector (10);

[0020] A direct-injection steam pipeline (14), the direct-injection steam pipeline (14) being arranged in the rehumidification zone (13), and the direct-injection steam pipeline (14) being connected to a first control valve (9);

[0021] The output ends of the high-pressure steam pipeline (1) and the medium-pressure steam pipeline (11) are both connected to the input end of the direct-injection steam pipeline (14); and the first control valve (9) and the ejector (10) are both connected to the control device.

[0022] Preferably, it further comprises a water pump (6), the water pump (6) being connected to the bottom of the water storage tank (5) via a water outlet pipe, wherein the water pump (6) is connected to the control device.

[0023] Preferably, it further comprises a safety valve (7), and the safety valve (7) is connected to the upper side of the water storage tank (5).

[0024] Preferably, it also includes a first switch valve (12) connected to the medium-pressure steam pipe (11) and a second switch valve (17) connected to the output end of the high-pressure steam pipeline (1).

[0025] Preferably, it also includes a second control valve (18) connected to the second connecting main pipe (16), and the second control valve (18) is connected to the control device.

[0026] Preferably, the output end of the condensed water collecting pipe (4) is connected to the bottom of the water storage tank (5).

[0027] Preferably, the low-pressure steam pipe (8) is connected to the other side above the water storage tank (5).

[0028] Preferably, a plurality of spray heads are connected to the direct-injection steam pipeline (14).

[0029] Preferably, it also includes a water level sensor, which is arranged on the water storage tank (5) and connected to the control device.

[0030] Preferably, the water level sensor comprises a low water level sensor (19), a middle water level sensor (20) and a high water level sensor (21), wherein the low water level sensor (19) is arranged on one side of the lower side wall of the water storage tank (5); the middle water level sensor (20) is arranged on one side of the middle side wall of the water storage tank (5); and the high water level sensor (21) is arranged on one side of the upper side wall of the water storage tank (5), wherein the low water level sensor (19), the middle water level sensor (20) and the high water level sensor (21) are all connected to the control device.

[0031] In the utility model, the low water level sensor (19), the middle water level sensor (20) and the high water level sensor (21) are signal-connected to the control device.

[0032] The working principle is as follows: during use, as the equipment is started up, the high-pressure steam pipeline (1) provides high-pressure steam. After the high-pressure steam passes through the first connecting main pipe (15) and enters the several heat exchangers (3) in the drying area (2), the high-temperature condensed water generated gradually flows into the condensed water collecting pipe (4), and enters the water storage tank (5) through the condensed water collecting pipe (4). When the high-temperature condensed water in the water storage tank (5) reaches the use water level, the high-pressure steam pipeline (1) provides high-pressure steam. After the high-pressure steam passes through the second connecting main pipe (16) and is regulated by the second control valve (18), the low-pressure secondary steam generated by the high-temperature condensed water in the water storage tank (5) is drawn out through the low-pressure steam pipe (8) by the ejector (10), mixed into medium-pressure steam, and then supplied to the direct injection steam pipeline (14) in the rehumidification area (13) through the medium-pressure steam pipe (11) for use.

[0033] Compared with the prior art, the utility model has the following beneficial effects:

[0034] 1. The utility model makes full use of the secondary steam generated by the storage of high-temperature condensed water, reduces the steam consumption of the direct-injection steam pipeline during the rehumidification process of the tobacco slice re-baking machine, realizes the recycling of the secondary steam of high-temperature condensed water, and achieves the purpose of energy saving;

[0035] 2. The water storage tank of the utility model is also connected to a water pump, which can discharge the excess condensed water into the condensed water recovery pipeline through the water pump, so as to realize the recovery and reuse of the condensed water;

[0036] 3. The water storage tank of the utility model is also connected with a safety valve to ensure that the internal pressure of the water storage tank does not exceed the safety range. When the internal pressure of the water storage tank exceeds the set value, the safety valve will automatically open to release the pressure and keep the internal pressure of the water storage tank within the safety range, which helps to maintain the stability and normal operation of the system and prevent the tank from rupturing due to overpressure or other safety accidents;

[0037] 4. The water storage tank of the utility model is also equipped with a water level sensor, which can monitor the water level in the water storage tank in real time, helping managers understand the water level changes in the reservoir. At the same time, the water level sensor can also automatically monitor the water level, reduce manual intervention, improve work efficiency, and realize intelligent energy-saving control. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0039] Figure 1 It is a usage state diagram of the utility model;

[0040] Figure 2 It is a schematic diagram of the overall structure of the utility model;

[0041] Figure 3 It is a usage state diagram of another design structure of the utility model;

[0042] Among them, the numbers in the figure are: 1-high-pressure steam pipeline, 2-drying area, 3-heat exchanger, 4-condensate collection pipe, 5-water storage tank, 6-water pump, 7-safety valve, 8-low-pressure steam pipe, 9-first control valve, 10-ejector, 11-medium-pressure steam pipe, 12-first switch valve, 13-rehumidification area, 14-direct injection steam pipeline, 15-first connecting main pipe, 16-second connecting main pipe, 17-second switch valve, 18-second control valve, 19-low water level sensor, 20-medium water level sensor, 21-high water level sensor. DETAILED DESCRIPTION

[0043] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0044] As the instruction manual Figure 1 To the instruction manual Figure 3 A condensate water recycling system for a tobacco sheet redrying machine shown includes a control device and also includes:

[0045] High pressure steam pipeline 1;

[0046] Several heat exchangers 3 are arranged in the drying area 2, and the input ends of the several heat exchangers 3 are connected to the high-pressure steam pipeline 1 through the first connecting main pipe 15;

[0047] A condensed water collecting pipe 4, the input end of which is connected to the output ends of the heat exchangers 3 respectively;

[0048] A water storage tank 5, the water storage tank 5 is connected to the output end of the condensed water collecting pipe 4;

[0049] A low-pressure steam pipe 8, the input end of the low-pressure steam pipe 8 is connected to the water storage tank 5, and the output end of the low-pressure steam pipe 8 is connected to an ejector 10;

[0050] A second connecting main pipe 16, the input end of the second connecting main pipe 16 is connected to the high-pressure steam pipeline 1, and the output end of the second connecting main pipe 16 is connected to the ejector 10;

[0051] A medium-pressure steam pipe 11, the input end of the medium-pressure steam pipe 11 is connected to the output end of the ejector 10;

[0052] A direct steam injection pipeline 14, which is arranged in the rehumidification zone 13, and a first control valve 9 is connected to the direct steam injection pipeline 14;

[0053] The output ends of the high-pressure steam pipeline 1 and the medium-pressure steam pipeline 11 are both connected to the input end of the direct-injection steam pipeline 14; the first control valve 9 and the ejector 10 are both connected to the control device.

[0054] In the utility model, a single rehumidification zone 13 is provided with a direct injection steam pipeline 14 with a first control valve 9 for adjustment; at the same time, it can also be configured in rehumidification zone 1, rehumidification zone 2, rehumidification zone 3, and rehumidification zone 4 according to needs; the high-pressure steam pipeline 1 of the tobacco slice re-drying machine is used to provide high-pressure steam, and the condensed water generated by the heat exchanger 3 in each box of the drying zone 2 enters the water storage tank 5 through the condensed water collection pipe 4; the first control valve 9 and the ejector 10 are both connected to the control device by signal.

[0055] The control device is a programmable logic controller or a PLC or a PC.

[0056] Furthermore, it also includes a water pump 6, which is connected to the bottom of the water storage tank 5 through a water outlet pipe, wherein the water pump 6 is connected to the control device.

[0057] In the present invention, the water pump 6 is a hot water pump, and the excess condensed water in the water storage tank 5 can be discharged into the condensed water recovery pipeline through the water pump 6 for recycling; the water pump 6 is signal-connected or electrically connected to the control device.

[0058] Furthermore, it also includes a safety valve 7 , which is connected to the upper side of the water storage tank 5 .

[0059] Furthermore, it also includes a first switch valve 12 connected to the medium-pressure steam pipe 11 and a second switch valve 17 connected to the output end of the high-pressure steam pipeline 1 .

[0060] In the present invention, both the first switch valve 12 and the second switch valve 17 are signal-connected to the control device.

[0061] Furthermore, it also includes a second control valve 18 connected to the second connecting main pipe 16, and the second control valve 18 is connected to the control device.

[0062] In the present invention, the second control valve 18 is signal-connected to the control device.

[0063] Furthermore, the output end of the condensed water collecting pipe 4 is connected to the bottom of the water storage tank 5 .

[0064] Furthermore, the low-pressure steam pipe 8 is connected to the other side above the water storage tank 5 .

[0065] Furthermore, the direct-injection steam pipeline 14 is connected to a plurality of spray heads.

[0066] Furthermore, it also includes a water level sensor, which is arranged on the water storage tank 5 and connected to the control device.

[0067] Specifically, Figure 3 As shown, the water level sensor includes a low water level sensor 19, a middle water level sensor 20 and a high water level sensor 21, the low water level sensor 19 is arranged on the side of the lower side wall of the water storage tank 5; the middle water level sensor 20 is arranged on the side of the middle side wall of the water storage tank 5; the high water level sensor 21 is arranged on the side of the upper side wall of the water storage tank 5, wherein the low water level sensor 19, the middle water level sensor 20 and the high water level sensor 21 are all connected to the control device.

[0068] In the present invention, the low water level sensor 19, the middle water level sensor 20 and the high water level sensor 21 are connected to the control device by signals.

[0069] In summary, a more specific implementation method of the present invention is:

[0070] Before using the condensate recovery system for a tobacco sheet redrying machine of the above-mentioned design structure, the already manufactured system needs to be installed as a backup.

[0071] The specific usage steps are: as the equipment startup time goes by, the high-pressure steam pipeline 1 provides high-pressure steam. After the high-pressure steam enters the several heat exchangers 3 in the drying area 2 through the first connecting main pipe 15, the high-temperature condensed water generated gradually converges into the condensed water collecting pipe 4, and enters the water storage tank 5 through the condensed water collecting pipe 4. When the high-temperature condensed water in the water storage tank 5 reaches the use water level, the high-pressure steam pipeline 1 provides high-pressure steam. The high-pressure steam passes through the second connecting main pipe 16 and is regulated by the second control valve 18. The low-pressure secondary steam generated by the high-temperature condensed water in the water storage tank 5 is drawn out through the low-pressure steam pipe 8 by the ejector 10. After being mixed into medium-pressure steam, it is supplied to the direct injection steam pipeline 14 in the rehumidification area 13 through the medium-pressure steam pipe 11 for use.

[0072] More specifically, during the above-mentioned use, since a water level sensor is also provided, when the high-temperature condensed water in the water storage tank 5 reaches the use water level, that is, reaches the middle water level sensor 20, under the control of the control device, the water pump 6 is closed, the first control valve 9 is opened, the ejector 10 is opened, the first switch valve 12 is opened, the second switch valve 17 is closed, and the second control valve 18 is opened; a single rehumidification zone 13 with a direct injection steam pipeline 14 regulated by the first control valve 9 can supply steam to the rehumidification zone 13 through the control device through the high-pressure steam pipeline 1, the water storage tank 5, the second connecting main pipe 16, the second control valve 18, the low-pressure steam pipe 8, the ejector 10, the medium-pressure steam pipe 11, and the first switch valve 12.

[0073] When the water level in the water storage tank 5 reaches the low water level sensor 19, under the control of the control device, the water pump 6 is closed, the first control valve 9 is opened, the ejector 10 is closed, the first switch valve 12 is closed, the second switch valve 17 is opened, and the second control valve 18 is closed, and the high-pressure steam pipeline 1 directly supplies steam to the direct injection steam pipeline 14 in the rehumidification zone 13 through the second switch valve 17.

[0074] When the water level in the water storage tank 5 reaches the high water level sensor 21, under the control of the control device, the water pump 6 is turned on to remove excess condensed water.

[0075] When the equipment is shut down, the water pump 6 is turned on to discharge the condensed water in the water storage tank 5 to the low water level sensor 19, and then the water pump 6 is turned off.

[0076] During the above use process, the equipment can automatically switch the steam supply pipeline for use according to the situation; however, the low-pressure steam pipe 8 cannot be directly connected to the high-pressure steam pipeline 1 to prevent the low-pressure steam pipe 8 from being blocked by the high-pressure steam of the high-pressure steam pipeline 1, resulting in fluctuations in the pressure of the direct injection steam pipeline;

[0077] In addition, the condensed water generated at the initial startup of the equipment is less, which is insufficient to generate sufficient secondary steam for the direct injection steam pipeline 14 in the rehumidification zone 13, and the high-pressure steam pipeline 1 has to be used to supply steam, so the second switch valve 17 is set at the input end of the direct injection steam pipeline 14 in each rehumidification zone in the system for switching the steam pipeline. It can also be configured in the direct injection steam pipelines of the rehumidification zone 1, rehumidification zone 2, rehumidification zone 3, and rehumidification zone 4 according to needs.

[0078] During use, when the high-temperature condensed water in the water storage tank 5 reaches the position of the high water level sensor 21, the high water level sensor 21 will send water level information to the control device, and then the control device will send an instruction to the water pump 6 to drain water. The water pump 6 starts to work to drain water until the predetermined control water level is reached; the water pump 6 can discharge excess condensed water into the condensed water recovery pipeline through the outlet pipe, thereby realizing the recovery and reuse of the condensed water.

[0079] Finally, it should be noted that the above is only a preferred embodiment of the utility model, and does not limit the utility model in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the content of the technical solution of the utility model still belongs to the protection scope of the technical solution of the utility model.

Claims

1. A condensed water recycling system for a tobacco sheet redrying machine, comprising a control device, characterized in that: Also includes: High-pressure steam pipeline (1); A plurality of heat exchangers (3), wherein the plurality of heat exchangers (3) are arranged in the drying area (2), and the input ends of the plurality of heat exchangers (3) are connected to the high-pressure steam pipeline (1) via a first connecting main pipe (15); A condensed water collecting pipe (4), the input end of which is connected to the output ends of the plurality of heat exchangers (3); A water storage tank (5), the water storage tank (5) is connected to the output end of the condensed water collecting pipe (4); A low-pressure steam pipe (8), wherein the input end of the low-pressure steam pipe (8) is connected to the water storage tank (5), and the output end of the low-pressure steam pipe (8) is connected to an ejector (10); A second connecting main pipe (16), the input end of the second connecting main pipe (16) being communicated with the high-pressure steam pipeline (1), and the output end of the second connecting main pipe (16) being connected with the ejector (10); A medium-pressure steam pipe (11), the input end of the medium-pressure steam pipe (11) is connected to the output end of the ejector (10); A direct-injection steam pipeline (14), the direct-injection steam pipeline (14) being arranged in the rehumidification zone (13), and the direct-injection steam pipeline (14) being connected to a first control valve (9); The output ends of the high-pressure steam pipeline (1) and the medium-pressure steam pipeline (11) are both connected to the input end of the direct-injection steam pipeline (14); and the first control valve (9) and the ejector (10) are both connected to the control device.

2. The condensed water recycling system of a tobacco sheet redrying machine according to claim 1, characterized in that: It also includes a water pump (6), which is connected to the bottom of the water storage tank (5) through a water outlet pipe, wherein the water pump (6) is connected to the control device.

3. The condensed water recycling system of a tobacco sheet redrying machine according to claim 1, characterized in that: It also includes a safety valve (7), which is connected to the upper side of the water storage tank (5).

4. The condensed water recycling system of a tobacco sheet redrying machine according to claim 1, characterized in that: It also includes a first switch valve (12) connected to the medium-pressure steam pipe (11) and a second switch valve (17) connected to the output end of the high-pressure steam pipeline (1).

5. The condensed water recycling system of a tobacco sheet redrying machine according to claim 1, characterized in that: It also includes a second control valve (18) connected to the second connecting main pipe (16), and the second control valve (18) is connected to the control device.

6. The condensed water recycling system of a tobacco sheet redrying machine according to claim 1, characterized in that: The output end of the condensed water collecting pipe (4) is connected to the bottom of the water storage tank (5).

7. The condensed water recycling system of a tobacco sheet redrying machine according to claim 1, characterized in that: The low-pressure steam pipe (8) is connected to the other side above the water storage tank (5).

8. The condensed water recycling system of a tobacco sheet redrying machine according to claim 1, characterized in that: The direct-injection steam pipeline (14) is connected to a plurality of spray heads.

9. The condensed water recycling system of a tobacco sheet redrying machine according to claim 1, characterized in that: It also includes a water level sensor, which is arranged on the water storage tank (5) and is connected to the control device.

10. The condensed water recycling system of a tobacco sheet redrying machine according to claim 9, characterized in that: The water level sensor comprises a low water level sensor (19), a middle water level sensor (20) and a high water level sensor (21), wherein the low water level sensor (19) is arranged on one side of the lower side wall of the water storage tank (5); the middle water level sensor (20) is arranged on one side of the middle side wall of the water storage tank (5); and the high water level sensor (21) is arranged on one side of the upper side wall of the water storage tank (5), wherein the low water level sensor (19), the middle water level sensor (20) and the high water level sensor (21) are all connected to a control device.

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