Low-grade hot water recycling system and method

Abstract

The invention relates to the technical field of beer brewing, and discloses a low-grade hot water recycling system which comprises a hot water recycling tank, a sterilization machine, a bottle washing machine, a sterilization heat exchanger, a bottle washing heat exchanger, a first pipeline, a second pipeline, a third pipeline and a fourth pipeline. The sterilization heat exchanger is attached to the sterilization machine, one end of the sterilization heat exchanger is communicated with the steam pipe, and the other end of the sterilization heat exchanger is communicated with the upper portion of the hot water recycling tank through a first pipeline. The bottle washing heat exchanger is attached to the bottle washing machine, one end of the bottle washing heat exchanger is communicated with the steam pipe, and the other end of the bottle washing heat exchanger is communicated with the upper portion of the hot water recycling tank through a second pipeline. The lower portion of the hot water recycling tank is communicated with the interior of the sterilization machine and the interior of the bottle washing machine through a third pipeline, and the sterilization machine and the bottle washing machine are communicated with the upper portion of the hot water recycling tank again through a fourth pipeline. By effectively recycling and utilizing low-grade hot water, the comprehensive utilization rate of heat energy is remarkably increased, and therefore energy consumption and production cost are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of beer brewing, and in particular to a low-grade hot water recycling system and method. Background Art

[0002] In the industrial production process, especially in the food, beverage and pharmaceutical industries, a large amount of hot water is used for equipment cleaning, sterilization and other operations. The low-grade hot water generated in these operations is usually directly discharged, resulting in heat energy waste and environmental pollution. Therefore, it is of great significance to develop a system and method that can effectively recycle low-grade hot water. Summary of the invention

[0003] In order to overcome the problems existing in the prior art, the object of the present invention is to provide a low-grade hot water recovery and utilization system and method.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a low-grade hot water recovery and utilization system, comprising: a hot water recovery tank, a sterilizer, a bottle washing machine, a sterilization heat exchanger, a bottle washing heat exchanger, a first pipeline, a second pipeline, a third pipeline, and a fourth pipeline; the sterilization heat exchanger is fitted with the sterilizer, one end of the sterilization heat exchanger is connected to the steam pipe, and the other end of the sterilization heat exchanger is connected to the upper part of the hot water recovery tank through the first pipeline; the bottle washing heat exchanger is fitted with the bottle washing machine, one end of the bottle washing heat exchanger is connected to the steam pipe, and the other end of the bottle washing heat exchanger is connected to the upper part of the hot water recovery tank through the second pipeline; the lower part of the hot water recovery tank is connected to the inside of the sterilizer and the inside of the bottle washing machine through the third pipeline, and the sterilizer and the bottle washing machine are reconnected with the upper part of the hot water recovery tank through the fourth pipeline.

[0005] Main working principle: The working principle of the present invention is mainly based on heat exchange and hot water recycling. Specifically, the sterilization heat exchanger and the bottle washing heat exchanger will convert steam into low-grade hot water during the heating process of the sterilizer and the bottle washing machine, and the low-grade hot water will be collected and stored in the hot water recovery tank. When the sterilizer and the bottle washing machine need to be heated, the system first uses the stored low-grade hot water for preheating, thereby improving the utilization rate of thermal energy and reducing production costs.

[0006] First, the sterilization heat exchanger is attached to the sterilizer, one end of which is connected to the steam pipe, and the other end is connected to the upper part of the hot water recovery tank through the first pipeline. When the steam passes through the sterilization heat exchanger, its heat is transferred to the sterilizer, and the steam is converted into low-grade hot water, which flows into the hot water recovery tank through the first pipeline for storage. The bottle washing heat exchanger is attached to the bottle washing machine, one end of which is also connected to the steam pipe, and the other end is connected to the upper part of the hot water recovery tank through the second pipeline. The working principle of the bottle washing heat exchanger is the same as that of the sterilization heat exchanger, which also converts steam into low-grade hot water, which flows into the hot water recovery tank through the second pipeline.

[0007] Then, since the lower part of the hot water recovery tank is connected to the inside of the sterilizer and the bottle washer through the third pipeline, when the sterilizer and the bottle washer need to be started again, the low-grade hot water stored in the hot water recovery tank can flow into the sterilizer and the bottle washer through the third pipeline to preheat the equipment.

[0008] Finally, the preheated low-grade hot water and other hot water in the sterilizer and bottle washing machine flow back to the upper part of the hot water recovery tank through the fourth pipeline for reuse or storage.

[0009] In this way, the low-grade hot water recycling system of the present invention can effectively recycle the low-grade hot water generated in the industrial production process, improve the utilization rate of thermal energy, reduce production costs, and reduce environmental pollution.

[0010] Preferably, it also includes a fifth pipeline; a first valve is provided on the first pipeline, the fifth pipeline is connected to the first pipeline, and one end of the fifth pipeline is arranged on the side of the first valve away from the hot water recovery tank, the other end of the fifth pipeline is connected to the sterilizer, and a fifth valve is provided on the fifth pipeline.

[0011] Preferably, it further includes a sixth pipeline; a second valve is provided on the second pipeline, the sixth pipeline is connected to the second pipeline, and one end of the sixth pipeline is arranged on a side of the second valve away from the hot water recovery tank, the other end of the sixth pipeline is connected to the bottle washing machine, and a sixth valve is provided on the sixth pipeline.

[0012] Preferably, a hot water buffer chamber is provided between the sterilizer and the sterilization heat exchanger, the sterilization heat exchanger heats the hot water buffer chamber, and the hot water buffer chamber transports the heated hot water to the sterilizer through a plurality of branches.

[0013] Preferably, it further includes an overflow water recovery tank, a seventh pipeline, an eighth pipeline and a bottle unscrambler; the water inlet end of the seventh pipeline is connected to the sterilizer and the bottle washing machine respectively, and the water outlet end of the seventh pipeline is connected to the overflow water recovery tank; the water inlet end of the eighth pipeline is connected to the overflow water recovery tank, and the water outlet end of the eighth pipeline is connected to the bottle unscrambler.

[0014] Preferably, it also includes a clean machine, a clean heat exchanger and a ninth pipeline; the clean heat exchanger is attached to the clean machine, one end of the clean heat exchanger is connected to the steam pipe, and the other end of the clean heat exchanger is connected to the upper part of the hot water recovery tank through the ninth pipeline.

[0015] Preferably, a clean water recovery tank, a tenth pipeline, an eleventh pipeline and a sprayer; the water inlet end of the tenth pipeline is connected to the clean machine, and the water outlet end of the tenth pipeline is connected to the clean water recovery tank; the water inlet end of the eleventh pipeline is connected to the clean water recovery tank, and the water outlet end of the eleventh pipeline is connected to the sprayer.

[0016] A method for recycling low-grade hot water, using any of the above-mentioned low-grade hot water recycling systems, comprises the following steps:

[0017] S1. Connect the steam pipe to the sterilization heat exchanger and the bottle washing heat exchanger before starting, then start the sterilization heat exchanger and the bottle washing heat exchanger to heat the sterilizer and the bottle washing machine respectively;

[0018] S2. During the heating process, steam is converted into low-grade hot water. The low-grade hot water discharged from the sterilization heat exchanger flows into the hot water recovery tank along the first pipeline for storage, and the low-grade hot water discharged from the bottle washing heat exchanger flows into the hot water recovery tank along the second pipeline for storage;

[0019] S3. When the sterilizer and the bottle washer have finished working, they need to be emptied. When they need to be started again, the low-grade hot water stored in the hot water recovery tank is discharged into the sterilizer and the bottle washer through the third pipeline and the fourth pipeline to heat the sterilizer and the bottle washer. If the low-grade hot water cannot make the sterilizer and the bottle washer reach the working temperature, the steam pipe is passed into the sterilization heat exchanger and the bottle washing heat exchanger, and then the sterilization heat exchanger and the bottle washing heat exchanger are started to further heat the sterilizer and the bottle washing machine respectively.

[0020] The low-grade hot water in S4, the sterilizer and the bottle washer flows back to the hot water recovery tank along the fourth pipeline.

[0021] Preferably, in S1 and S3, the second valve on the first pipeline is closed, and the fifth valve on the fifth pipeline is opened, and the low-grade hot water discharged from the sterilization heat exchanger flows back to the sterilizer along the fifth pipeline; the second valve on the second pipeline is closed, and the sixth valve on the sixth pipeline is opened, and the low-grade hot water discharged from the sterilization heat exchanger flows back to the sterilizer along the sixth pipeline.

[0022] Preferably, in S1 and S3, when the water levels of the sterilizer and the bottle washing machine are too high, the water in the sterilizer and the bottle washing machine flows into the overflow water recovery tank along the seventh pipeline, and the water in the overflow water recovery tank flows into the bottle unscrambler through the eighth pipeline; when the cleaning machine needs to be heated, the steam pipe is connected to the clean heat exchanger, and then the clean heat exchanger is started and the clean machines are heated respectively; during the heating process, the steam is converted into low-grade hot water, and the low-grade hot water discharged from the clean heat exchanger flows into the hot water recovery tank along the ninth pipeline for storage; the purified water purified by the cleaning machine flows into the clean water recovery tank along the tenth pipeline, and the water in the clean water recovery tank flows into the spray machine through the eleventh pipeline.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention significantly improves the comprehensive utilization rate of thermal energy by effectively recovering and utilizing low-grade hot water, thereby reducing energy consumption and production costs, and reducing direct emissions of low-grade hot water, effectively reducing thermal pollution to the environment, and meeting the environmental protection requirements of sustainable development. At the same time, since the stored low-grade hot water can be used at any time when the sterilizer and bottle washer are needed, it provides additional thermal energy reserves, enhances the flexibility and stability of the production process, and uses low-grade hot water for preheating to reduce the sterilizer and bottle washer's dependence on high-temperature steam at startup, thereby reducing the thermal stress of the equipment and extending its service life. Through the recycling design of the system, the maximum utilization of hot water is achieved, and the recycling of resources in industrial production is promoted.

[0025] In summary, the low-grade hot water recovery and utilization system described in the present invention shows significant beneficial effects in improving thermal energy utilization, reducing environmental pollution, extending equipment service life, and promoting resource recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0027] Figure 1 This is a schematic diagram of the low-grade hot water recovery and utilization system;

[0028] 1. Hot water recovery tank; 2. Sterilizer; 3. Bottle washing machine; 4. Sterilizer heat exchanger; 5. Bottle washing heat exchanger; 6. Hot water buffer room; 7. Overflow water recovery tank; 8. Bottle unscrambler; 9. Cleaning machine; 10. Cleaning heat exchanger; 11. Clean water recovery tank; 12. Sprayer;

[0029] 1a, first pipeline; 2a, second pipeline; 3a, third pipeline; 4a, fourth pipeline; 5a, fifth pipeline; 6a, sixth pipeline; 7a, seventh pipeline; 8a, eighth pipeline; 9a, ninth pipeline; 10a, tenth pipeline; 11a, eleventh pipeline;

[0030] 1b, first valve; 2b, second valve; 5b, fifth valve; 6b, sixth valve. DETAILED DESCRIPTION

[0031] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. In the following description, many specific details are set forth in order to fully understand the present invention, and the embodiments described are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the art without making creative work are within the scope of protection of the present invention.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0033] Example 1

[0034] This embodiment discloses a low-grade hot water recycling system. Figure 1 As shown, it mainly includes a hot water recovery tank 1, a sterilizer 2, a bottle washer 3, a sterilization heat exchanger 4, a bottle washing heat exchanger 5, and multiple pipelines and valves. The sterilization heat exchanger 4 is attached to the sterilizer 2, one end of which is connected to the steam pipe, and the other end is connected to the upper part of the hot water recovery tank 1 through the first pipeline 1a. The bottle washing heat exchanger 5 is attached to the bottle washer 3, one end of which is connected to the steam pipe, and the other end is connected to the upper part of the hot water recovery tank 1 through the second pipeline 2a. The lower part of the hot water recovery tank 1 is connected to the inside of the sterilizer 2 and the bottle washing machine 3 through the third pipeline 3a, and at the same time, the sterilizer 2 and the bottle washing machine 3 are reconnected to the upper part of the hot water recovery tank 1 through the fourth pipeline 4a to form a cycle.

[0035] In some optional embodiments, a first valve 1b is provided on the first pipeline 1a, and a fifth pipeline 5a is additionally provided. The fifth pipeline 5a is communicated with the first pipeline 1a, one end of which is provided on the side of the first valve 1b away from the hot water recovery tank 1, and the other end is communicated with the sterilizer 2, and a fifth valve 5b is provided on the fifth pipeline 5a. This arrangement allows hot water to be directly introduced into the sterilizer 2 through the control of the fifth valve 5b when necessary, especially when the sterilizer 2 is heated for the first time, and this heating method can greatly improve the heating efficiency and reduce the heat loss caused by long-distance operation.

[0036] In some optional embodiments, a second valve 2b is provided on the second pipeline 2a, and a sixth pipeline 6a is additionally provided. The sixth pipeline 6a is in communication with the second pipeline 2a, one end of which is provided on the side of the second valve 2b away from the hot water recovery tank 1, and the other end is in communication with the bottle washing machine 3, and a sixth valve is provided on the sixth pipeline 6a. In this way, when necessary, hot water can be directly introduced into the bottle washing machine 3 through the control of the sixth valve, especially when the bottle washing machine 3 is heated for the first time, this heating method can greatly improve the heating efficiency and reduce the heat loss caused by long-distance operation.

[0037] In some optional embodiments, a hot water buffer chamber 6 is provided between the sterilizer 2 and the sterilization heat exchanger 4. The sterilization heat exchanger 4 heats the hot water buffer chamber 6, and the hot water buffer chamber 6 then transports the heated hot water to the sterilizer 2 through multiple branches. This ensures that the sterilizer 2 obtains a stable and uniform hot water supply, thereby improving the sterilization effect.

[0038] In some optional embodiments, an overflow water recovery tank 7, a seventh pipeline 7a, an eighth pipeline 8a and a bottle unscrambler 8 are additionally provided. The water inlet of the seventh pipeline 7a is respectively connected to the sterilizer 2 and the bottle washer 3, and the water outlet is connected to the overflow water recovery tank 7. The water inlet of the eighth pipeline 8a is connected to the overflow water recovery tank 7, and the water outlet is connected to the bottle unscrambler 8. In this way, the overflow water generated by the sterilizer 2 and the bottle washer 3 can be recovered and reused, thereby improving the utilization rate of water resources.

[0039] In some optional embodiments, a cleaning machine 9, a cleaning heat exchanger 10 and a ninth pipeline 9a are additionally provided. The cleaning heat exchanger 10 is attached to the cleaning machine 9, one end of which is connected to the steam pipe, and the other end is connected to the upper part of the hot water recovery tank 1 through the ninth pipeline 9a. In this way, the low-grade hot water generated by the cleaning machine 9 can also be recovered and utilized, further improving the overall efficiency of the system.

[0040] In some optional embodiments, a clean water recovery tank 11, a tenth pipeline 10a, an eleventh pipeline 11a and a sprayer 12 are additionally provided. The water inlet end of the tenth pipeline 10a is respectively connected to the clean machine 9, and the water outlet end is connected to the clean water recovery tank 11. The water inlet end of the eleventh pipeline 11a is connected to the clean water recovery tank 11, and the water outlet end is connected to the sprayer 12. In this way, the clean water generated by the clean machine 9 can be recovered and reused, such as for equipment such as the sprayer 12, to further save water resources.

[0041] In summary, the low-grade hot water recovery and utilization system of this embodiment realizes the effective recovery and reuse of low-grade hot water through reasonable pipeline design and equipment configuration, thereby improving the utilization rate of water resources and the overall efficiency of the system.

[0042] Example 2

[0043] This embodiment discloses a method for recycling low-grade hot water, and the steps are as follows:

[0044] S1. Before starting, connect the steam pipe to the sterilization heat exchanger 4 and the bottle washing heat exchanger 5 to ensure that the connection is tight and there is no leakage.

[0045] Then, the sterilizing heat exchanger 4 and the bottle washing heat exchanger 5 are started to heat the sterilizing machine 2 and the bottle washing machine 3. This stage is to ensure that the equipment reaches the appropriate temperature before formal operation.

[0046] S2. During the heating process, steam is converted into low-grade hot water. The low-grade hot water discharged from the sterilization heat exchanger 4 flows along the first pipeline 1a into the hot water recovery tank 1 for storage for subsequent use. The low-grade hot water discharged from the bottle washing heat exchanger 5 also flows through the second pipeline 2a into the same hot water recovery tank 1 for storage.

[0047] S3, when the sterilizer 2 and the bottle washing machine 3 have finished working, they need to be emptied. When the sterilizer 2 and the bottle washing machine 3 need to be started again, the low-grade hot water stored in the hot water recovery tank 1 is discharged into the sterilizer 2 and the bottle washing machine 3 through the third pipeline 3a and the fourth pipeline 4a to heat the sterilizer 2 and the bottle washing machine 3. If the low-grade hot water cannot make the sterilizer 2 and the bottle washing machine 3 reach the working temperature, the steam pipe is passed into the sterilization heat exchanger 4 and the bottle washing heat exchanger 5, and then the sterilization heat exchanger 4 and the bottle washing heat exchanger 5 are started to further heat the sterilizer 2 and the bottle washing machine 3 respectively;

[0048] S4, after completing the heating task, the low-grade hot water in the sterilizer 2 and the bottle washing machine 3 flows back to the hot water recovery tank 1 through the fourth pipeline 4a, so as to realize the recycling of hot water.

[0049] In S1 and S3, the second valve 2b on the first pipeline 1a is closed, and the fifth valve 5b on the fifth pipeline 5a is opened, and the low-grade hot water discharged from the sterilization heat exchanger 4 flows back to the sterilizer 2 along the fifth pipeline 5a;

[0050] The second valve 2b on the second pipeline 2a is closed, and the sixth valve on the sixth pipeline 6a is opened, and the low-grade hot water discharged from the sterilization heat exchanger 4 flows back to the sterilizer 2 along the sixth pipeline 6a. Therefore, the low-grade hot water discharged from the sterilization heat exchanger 4 and the bottle washing heat exchanger 5 can directly flow back to the sterilizer 2 and the bottle washing machine 3 along the fifth pipeline 5a and the sixth pipeline 6a, reducing heat loss.

[0051] In S1 and S3, when the water levels of the sterilizer 2 and the bottle washer 3 are too high, the water in the sterilizer 2 and the bottle washer 3 flows into the overflow water recovery tank 7 along the seventh pipeline 7a, and the water in the overflow water recovery tank 7 flows into the bottle unscrambler 8 through the eighth pipeline 8a;

[0052] When the clean machine 9 needs to be heated, the steam pipe is connected to the clean heat exchanger 10, and then the clean heat exchanger 10 is started to heat the clean machine 9 respectively; during the heating process, the steam is converted into low-grade hot water, and the low-grade hot water discharged from the clean heat exchanger 10 flows into the hot water recovery tank 1 along the ninth pipeline 9a for storage; the purified water purified by the clean machine 9 flows into the clean water recovery tank 11 along the tenth pipeline 10a, and the water in the clean water recovery tank 11 flows into the spray machine 12 through the eleventh pipeline 11a.

[0053] Through the implementation of the above steps and additional operations and optimization measures, the method achieves effective recovery and reuse of low-grade hot water, and improves the overall energy efficiency and water resource utilization of the system.

[0054] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Therefore, any modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A low-grade hot water recovery and utilization system, characterized in that: include: Hot water recovery tank, sterilizer, bottle washing machine, sterilizer heat exchanger, bottle washing heat exchanger, first pipeline, second pipeline, third pipeline, fourth pipeline; The sterilization heat exchanger is attached to the sterilizer, one end of the sterilization heat exchanger is connected to the steam pipe, and the other end of the sterilization heat exchanger is connected to the upper part of the hot water recovery tank through the first pipeline; the bottle washing heat exchanger is attached to the bottle washing machine, one end of the bottle washing heat exchanger is connected to the steam pipe, and the other end of the bottle washing heat exchanger is connected to the upper part of the hot water recovery tank through the second pipeline; The lower part of the hot water recovery tank is connected to the interior of the sterilizer and the bottle washer through the third pipeline, and the sterilizer and the bottle washer are reconnected to the upper part of the hot water recovery tank through the fourth pipeline.

2. The low-grade hot water recycling system according to claim 1, characterized in that: Also included is a fifth pipeline; The first pipeline is provided with a first valve, the fifth pipeline is connected with the first pipeline, and one end of the fifth pipeline is arranged on the side of the first valve away from the hot water recovery tank, the other end of the fifth pipeline is connected with the sterilizer, and the fifth pipeline is provided with a fifth valve.

3. The low-grade hot water recycling system according to claim 1, characterized in that: Also included is a sixth pipeline; The second pipeline is provided with a second valve, the sixth pipeline is connected with the second pipeline, and one end of the sixth pipeline is arranged on a side of the second valve away from the hot water recovery tank, the other end of the sixth pipeline is connected with the bottle washing machine, and the sixth pipeline is provided with a sixth valve.

4. The low-grade hot water recycling system according to claim 1, characterized in that: A hot water buffer chamber is provided between the sterilizer and the sterilization heat exchanger. The sterilization heat exchanger heats the hot water buffer chamber, and the hot water buffer chamber transports the heated hot water to the sterilizer through a plurality of branches.

5. The low-grade hot water recycling system according to claim 1, characterized in that: It also includes an overflow water recovery tank, a seventh pipeline, an eighth pipeline, and a bottle unscrambler; The water inlet end of the seventh pipeline is connected to the sterilizer and the bottle washer respectively, and the water outlet end of the seventh pipeline is connected to the overflow water recovery tank; The water inlet end of the eighth pipeline is connected to the overflow water recovery tank, and the water outlet end of the eighth pipeline is connected to the bottle unscrambler.

6. The low-grade hot water recycling system according to claim 1, characterized in that: It also includes a clean machine, a clean heat exchanger and a ninth pipeline; The clean heat exchanger is attached to the clean machine, one end of the clean heat exchanger is connected to the steam pipe, and the other end of the clean heat exchanger is connected to the upper part of the hot water recovery tank through the ninth pipeline.

7. The low-grade hot water recycling system according to claim 6, characterized in that: Clean water recovery tank, pipeline 10, pipeline 11 and sprayer; The water inlet end of the tenth pipeline is connected to the cleaning machine respectively, and the water outlet end of the tenth pipeline is connected to the clean water recovery tank; The water inlet end of the eleventh pipeline is connected to the clean water recovery tank, and the water outlet end of the eleventh pipeline is connected to the spray machine.

8. A method for recycling low-grade hot water, using the low-grade hot water recycling system according to any one of claims 1 to 7, characterized in that: Here are the steps: S1. Connect the steam pipe to the sterilization heat exchanger and the bottle washing heat exchanger before starting, then start the sterilization heat exchanger and the bottle washing heat exchanger to heat the sterilizer and the bottle washing machine respectively; S2. During the heating process, steam is converted into low-grade hot water. The low-grade hot water discharged from the sterilization heat exchanger flows into the hot water recovery tank along the first pipeline for storage, and the low-grade hot water discharged from the bottle washing heat exchanger flows into the hot water recovery tank along the second pipeline for storage; S3. When the sterilizer and the bottle washer have finished working, they need to be emptied. When they need to be started again, the low-grade hot water stored in the hot water recovery tank is discharged into the sterilizer and the bottle washer through the third pipeline and the fourth pipeline to heat the sterilizer and the bottle washer. If the low-grade hot water cannot make the sterilizer and the bottle washer reach the working temperature, the steam pipe is passed into the sterilization heat exchanger and the bottle washing heat exchanger, and then the sterilization heat exchanger and the bottle washing heat exchanger are started to further heat the sterilizer and the bottle washing machine respectively. The low-grade hot water in S4, the sterilizer and the bottle washer flows back to the hot water recovery tank along the fourth pipeline.

9. The method for recycling low-grade hot water according to claim 8, characterized in that: In S1 and S3, the second valve on the first pipeline is closed, and the fifth valve on the fifth pipeline is opened, so that the low-grade hot water discharged from the sterilization heat exchanger flows back to the sterilizer along the fifth pipeline; Close the second valve on the second pipeline, open the sixth valve on the sixth pipeline, and the low-grade hot water discharged from the sterilization heat exchanger flows back to the sterilizer along the sixth pipeline.

10. The method for recycling low-grade hot water according to claim 8, characterized in that: In S1 and S3, when the water level of the sterilizer and the bottle washer is too high, the water in the sterilizer and the bottle washer flows into the overflow water recovery tank along the seventh pipeline, and the water in the overflow water recovery tank flows into the bottle unscrambler through the eighth pipeline; When the clean machine needs to be heated, the steam pipe is connected to the clean heat exchanger, and then the clean heat exchanger is started to heat the clean machines respectively; during the heating process, the steam is converted into low-grade hot water, and the low-grade hot water discharged from the clean heat exchanger flows along the ninth pipeline into the hot water recovery tank for storage; the purified water purified by the clean machine flows along the tenth pipeline into the clean water recovery tank, and the water in the clean water recovery tank flows into the spray machine through the eleventh pipeline.

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