Steam recycling heating device for sterilization and cleaning and operation method of steam recycling heating device

Abstract

A steam recycling heating device for sterilization and cleaning comprises an evaporator, a leading-in pipeline is arranged at the bottom of the evaporator, and a steam-water separator is arranged on one side of the evaporator in a communicating mode. The evaporator comprises an evaporation shell, a guide-in cavity is formed in the lower portion of the evaporation shell, a plurality of vertical heat exchange pipelines are arranged on the upper portion of the guide-in cavity in a communicating mode, a guide-out cavity is arranged on the tops of the vertical heat exchange pipelines in a communicating mode, and a heating medium cavity is formed between the vertical heat exchange pipelines and the evaporation shell. And the heating medium cavity is communicated with the heating steam pipeline. The evaporator is adopted for heat exchange, steam reuse is carried out in cooperation with the steam-water separator, the heat exchange efficiency is high, steam with liquid cannot be generated, and the stability of the later steam using effect is guaranteed.

Description

Technical Field

[0001] This application relates to a steam recirculation heating device for sterilization and cleaning, and its operating method. Background Technology

[0002] In ampoule production, it is crucial to ensure the cleanliness of pipes, mixing tanks, and other components to prevent contamination from residual impurities or bacteria. Therefore, cleaning and sterilization of these components are necessary, typically achieved through steam injection. To prevent the injected steam from introducing external contaminants, water is reused by reheating it in an evaporator. During this process, replacements can be made by removing impurities or introducing sterile external water. Existing evaporators have two main problems: firstly, the temperature of the heat exchange section is not high enough, and sterilization is generally achieved through prolonged high temperatures, which is less effective at killing certain bacteria; secondly, the steam separator's processing efficiency is low, resulting in excessive energy loss. Summary of the Invention

[0003] To address the aforementioned problems, this application proposes a steam recirculation heating device for sterilization and cleaning, comprising an evaporator with an inlet pipe at its bottom and a steam-water separator connected to one side of the evaporator. The evaporator includes an evaporation shell with an inlet cavity at its lower part. Several vertical heat exchange pipes are connected to the upper part of the inlet cavity, and an outlet cavity is connected to the top of the vertical heat exchange pipes. A heat medium cavity is located between the vertical heat exchange pipes and the evaporation shell, and is connected to a heating steam pipe. This application utilizes an evaporator for heat exchange in conjunction with a steam-water separator for steam reuse, resulting in high heat exchange efficiency and preventing the generation of liquid-laden steam, thus ensuring stable steam performance in subsequent applications.

[0004] Preferably, a high-temperature filter is provided on the side of the vertical heat exchange pipe facing the inlet cavity; the high-temperature filter includes a resistance wire filter, and a polytetrafluoroethylene layer is coated on the outside of the resistance wire filter. This application, by setting a high-temperature filter, forms a high-temperature zone and adds a high-temperature sterilization position around the resistance wire filter, further ensuring the quality of the steam exported by this application.

[0005] Preferably, the high-temperature filter screen has a pore size of 20-50 mesh, the resistance wire filter screen is connected to an external power supply, and the temperature of the resistance wire filter screen is 280-300℃.

[0006] Preferably, the middle part of the steam-water separator is connected to the top of the evaporator through a connecting pipe, the lower part of the steam-water separator is connected to the bottom of the evaporator through a recirculation pipe, and a steam outlet pipe is provided at the top of the steam-water separator.

[0007] Preferably, the steam-water separator includes a separator housing, and a plurality of backflow baffles are provided in the middle of the separator housing.

[0008] Preferably, the backflow baffles are staggered, so that staggered airflow channels are formed between the backflow baffles and the inner wall of the separator housing.

[0009] Preferably, the backflow baffle includes a side connecting plate fixedly connected to the inner wall of the separator housing, a V-shaped recessed plate is provided at the end of the side connecting plate, and an extended connecting plate is provided on the side of the V-shaped recessed plate away from the side connecting plate.

[0010] Preferably, the V-shaped recessed plate is provided with a plurality of flow holes evenly distributed therefrom; the diameter of the flow holes is 1-10mm; and the distance between adjacent flow holes is not less than the diameter of the holes. In adjacent backflow baffles, the V-shaped recessed plate of the upper backflow baffle is correspondingly arranged with the extended connecting plate of the lower backflow baffle. This application employs a V-shaped recessed plate and backflow baffle operation method, which can improve the separation efficiency of water vapor and water flow, avoid repeated impacts, and thus increase the steam-water separation capacity under extreme conditions.

[0011] Preferably, an outer protective layer is provided on the outside of the backflow baffle, and the outer protective layer is prepared in the following manner: obtaining titanium oxide and silicon oxide nanoparticles; 6-8 parts by weight of nanoparticles are dispersed into a mixture of 30-40 parts by weight of acrylic emulsion and 10-15 parts by weight of polyurethane resin emulsion, wherein the solid content of the acrylic emulsion and polyurethane resin emulsion is 40-50 wt%, and the coating material is obtained after thorough mixing. The coating material is sprayed onto both sides of the backflow baffle, with no less than two spraying passes, and the thickness after drying is 0.3-0.7μm; Then, the reflux baffle is placed in a vacuum drying oven at 100-120℃ and heated for 10-12 hours.

[0012] Preferably, the titanium oxide and silicon oxide nanoparticles are prepared in the following manner: Dissolve 5-6 parts by weight of tetrabutyl titanate in 100-120 parts by weight of ethanol, then add 8-10 parts by weight of ZSM-5 molecular sieve and stir continuously for no less than 10 hours; the ZSM-5 molecular sieve has a mesh size of 150-200 mesh. The first filter residue is obtained by filtration. The first filter residue is added to 50-60 times its mass of 0.1-0.2 mol / L hydrochloric acid solution and allowed to stand for reaction for no less than 24 hours. The secondary filter residue obtained by filtration is then washed with deionized water, dried at 80-100℃ for 12-24 hours, calcined at 450-500℃ for 4-5 hours, cooled to room temperature, ground, and passed through a 500-600 mesh sieve to obtain titanium dioxide and silica nanoparticles. This application uses composite-synthesized titanium dioxide and silica nanoparticles to modify acrylic emulsion and polyurethane resin emulsion, resulting in a coating with good hydrophilicity. A water film forms on the surface, allowing for continuous flow even when there is a large amount of water in the steam-water separation, avoiding repeated mass exchange and improving the separation efficiency of the steam-water separator.

[0013] This application can bring the following beneficial effects: 1. This application uses an evaporator for heat exchange, combined with a steam-water separator, to reuse steam. This method has high heat exchange efficiency and does not produce liquid-laden steam, ensuring stable steam performance in the later stages.

[0014] 2. This application further ensures the quality of the steam exported by setting up a high-temperature filter screen to form a high-temperature zone and adding a high-temperature sterilization position around the resistance wire filter screen.

[0015] 3. The operation mode of the V-shaped sinking plate and the backflow baffle adopted in this application can improve the separation efficiency of water vapor and water flow, avoid repeated impact, and thus improve the steam-water separation capacity of this application under extreme conditions.

[0016] 4. This application uses composite-synthesized titanium dioxide and silicon dioxide nanoparticles to modify acrylic emulsion and polyurethane resin emulsion, so that the resulting coating has good hydrophilicity. When a water film is formed on the surface, continuous flow can be formed when there is a lot of water in the gas-water separation, avoiding the problem of repeated mass exchange and improving the separation effect of the gas-water separator. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the structure of this application.

[0018] Figure 2 This is a schematic diagram of a steam-water separator. Detailed Implementation

[0019] To clearly illustrate the technical features of this solution, the following detailed description, in conjunction with the accompanying drawings, will be provided.

[0020] Regarding the structure of this application, as Figure 1-2As shown, a steam recirculation heating device for sterilization and cleaning includes an evaporator 1, an inlet pipe 2 at the bottom of the evaporator 1, and a steam-water separator 3 connected to one side of the evaporator 1. The evaporator 1 includes an evaporation shell 4, an inlet cavity 5 at the lower part of the evaporation shell 4, a plurality of vertical heat exchange pipes 6 connected to the upper part of the inlet cavity 5, an outlet cavity 7 connected to the top of the vertical heat exchange pipes 6, and a heat medium cavity 8 between the vertical heat exchange pipes 6 and the evaporation shell 4, which is connected to a heating steam pipe 9.

[0021] A high-temperature filter 10 is installed on the side of the vertical heat exchange pipe 6 facing the inlet cavity 5. The high-temperature filter 10 includes a resistance wire filter, with a polytetrafluoroethylene layer coated on the outer side. The pore size of the high-temperature filter 10 is 20-50 mesh. The resistance wire filter is connected to an external power supply, and its temperature is 280-300℃. This provides a high-temperature layer to achieve secondary sterilization, and also has a certain heating effect.

[0022] The middle part of the steam-water separator 3 is connected to the top of the evaporator 1 via a connecting pipe 11, and the lower part of the steam-water separator 3 is connected to the bottom of the evaporator 1 via a recirculation pipe 12. A steam outlet pipe 13 is provided at the upper part of the steam-water separator 3. The steam-water separator 3 includes a separator shell 14, and a plurality of backflow baffles 15 are provided in the middle part of the separator shell 14. The backflow baffles 15 are staggered, so that staggered airflow channels 16 are formed between the backflow baffles 15 and the inner wall of the separator shell 14. The backflow baffle 15 includes a side connecting plate 17 fixedly connected to the inner wall of the separator shell 14, a V-shaped recessed plate 18 is provided at the end of the side connecting plate 17, and an extended connecting plate 19 is provided on the side of the V-shaped recessed plate 18 away from the side connecting plate 17. The V-shaped recessed plate 18 is evenly provided with a plurality of flow holes; the diameter of the flow holes is 1-10mm; the distance between adjacent flow holes is not less than the diameter of the hole; in the adjacent backflow baffles 15, the V-shaped recessed plate 18 of the upper backflow baffle 15 is correspondingly arranged with the extended connecting plate 19 of the lower backflow baffle 15. This avoids mutual interference when the water flow and air flow are strong.

[0023] For the synthesis of the outer protective layer, an outer protective layer is provided on the outside of the backflow baffle 15. The outer protective layer is prepared in the following manner: titanium oxide and silicon oxide nanoparticles are obtained. 6-8 parts by weight of nanoparticles are dispersed into a mixture of 30-40 parts by weight of acrylic emulsion and 10-15 parts by weight of polyurethane resin emulsion, wherein the solid content of the acrylic emulsion and polyurethane resin emulsion is 40-50 wt%, and the coating material is obtained after thorough mixing. The coating material is sprayed onto both sides of the backflow baffle, with no less than two spraying passes, and the thickness after drying is 0.3-0.7 mm. Then, the backflow baffle 15 is placed in a vacuum drying oven at 100-120℃ and heated for 10-12 hours.

[0024] The titanium dioxide and silicon dioxide nanoparticles were prepared in the following manner: Dissolve 5-6 parts by weight of tetrabutyl titanate in 100-120 parts by weight of ethanol, then add 8-10 parts by weight of ZSM-5 molecular sieve and stir continuously for no less than 10 hours; the ZSM-5 molecular sieve has a mesh size of 150-200 mesh. The first filter residue is obtained by filtration. The first filter residue is added to 50-60 times its mass of 0.1-0.2 mol / L hydrochloric acid solution and allowed to stand for reaction for no less than 24 hours. The secondary filter residue is obtained by filtration. This residue is then washed with deionized water, dried at 80-100℃ for 12-24 hours, calcined at 450-500℃ for 4-5 hours, cooled to room temperature, ground, and passed through a 500-600 mesh sieve to obtain titanium dioxide and silicon dioxide nanoparticles. These nanoparticles serve to modify the coating and improve its hydrophilicity.

[0025] To demonstrate the effectiveness of this application for the coating material on the backflow baffle 15, the following examples are provided: To simplify the characterization process, five backflow baffles were installed in the steam-water separator, and then 5% supersaturated steam at 130°C was introduced. The flow rate was continuously increased until the water content in the steam discharged from the steam-water separator exceeded 5%, and the corresponding steam flow rate value was recorded.

[0026] Example 1: S101. Obtaining titanium dioxide and silicon dioxide nanoparticles: Titanium oxide and silicon oxide nanoparticles were prepared as follows: Dissolve 5 parts by weight of tetrabutyl titanate in 100 parts by weight of ethanol, then add 8 parts by weight of ZSM-5 molecular sieve, and stir continuously for 10 hours; the ZSM-5 molecular sieve has a mesh size of 150 mesh. The first filter residue was obtained by filtration. The first filter residue was added to 50 times its mass of 0.1 mol / L hydrochloric acid solution and allowed to stand for 24 hours. The secondary filter residue was obtained by filtration. The secondary filter residue was washed with deionized water, dried at 80°C for 24 hours, then heated to 450°C and calcined for 5 hours. After cooling to room temperature, it was ground and passed through a 500-mesh sieve to obtain titanium dioxide and silicon dioxide nanoparticles.

[0027] S102. Raw material mixing: Six parts by weight of nanoparticles were dispersed into a mixture of 30 parts by weight of acrylic emulsion and 10 parts by weight of polyurethane resin emulsion, wherein the solid content of the acrylic emulsion and polyurethane resin emulsion was 40 wt%. After thorough mixing, a coating material was obtained. S103. Material spraying: The coating material was sprayed onto both sides of the backflow baffle, with two spraying passes, and the thickness after drying was 0.3 mm. S104. Heating and fixing: Then, the backflow baffle 15 was placed in a vacuum drying oven at 100°C and heated for 12 hours.

[0028] The steam flow rate at which the maximum processing capacity is measured is 2.3 t / h.

[0029] Example 2: S201. Obtaining titanium dioxide and silicon dioxide nanoparticles: Titanium oxide and silicon oxide nanoparticles were prepared as follows: Dissolve 6 parts by mass of tetrabutyl titanate in 120 parts by mass of ethanol, then add 10 parts by mass of ZSM-5 molecular sieve, and stir continuously for 10 hours; the ZSM-5 molecular sieve has a mesh size of 200 mesh. The first filter residue was obtained by filtration. The first filter residue was added to 60 times its mass of 0.2 mol / L hydrochloric acid solution and allowed to stand for 24 hours. The secondary filter residue was obtained by filtration. The secondary filter residue was washed with deionized water, dried at 100°C for 12 hours, then heated to 500°C for 4 hours, cooled to room temperature, ground, and passed through a 600-mesh sieve to obtain titanium oxide and silicon oxide nanoparticles.

[0030] S202. Raw material mixing: Eight parts by weight of nanoparticles were dispersed into a mixture of 40 parts by weight of acrylic emulsion and 15 parts by weight of polyurethane resin emulsion, wherein the solid content of the acrylic emulsion and polyurethane resin emulsion was 50 wt%. After thorough mixing, a coating material was obtained. S203. Material spraying: The coating material was sprayed onto both sides of the backflow baffle, with four coats applied, resulting in a thickness of 0.7 mm after drying. S204. Heating and fixing: Then, the backflow baffle 15 was placed in a vacuum drying oven at 120°C and heated for 10 hours.

[0031] The steam flow rate at which the maximum processing capacity is measured is 2.4 t / h.

[0032] Make the following comparative example: Comparative Example 1: Based on Example 1, step S101 was omitted, and the nanoparticles in S102 were replaced with 3 parts by mass of titanium dioxide nanoparticles and 3 parts by mass of silicon dioxide nanoparticles. The maximum processing capacity was measured to be 1.9 t / h.

[0033] Comparative Example 2: Using a gas-water separator without a coating, the maximum processing capacity was measured to be 1.5 t / h.

[0034] Comparative Example 3: In S101, titanium dioxide and silica nanoparticles were prepared by grinding and mixing 3 parts by mass of titanium dioxide nanoparticles and 3 parts by mass of silica nanoparticles. The maximum processing capacity was measured to be 1.9 t / h.

[0035] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A steam recirculation heating device for sterilization and cleaning, characterized in that: The device includes an evaporator with an inlet pipe at the bottom and a steam-water separator connected to one side of the evaporator. The evaporator includes an evaporation shell with an inlet cavity at the bottom and several vertical heat exchange pipes connected to the upper part of the inlet cavity. An outlet cavity is connected to the top of the vertical heat exchange pipes. A heat medium cavity is provided between the vertical heat exchange pipes and the evaporation shell and is connected to a heating steam pipe.

2. The steam recirculation heating device for sterilization and cleaning as described in claim 1, characterized in that: A high-temperature filter screen is installed on the side of the vertical heat exchange pipe facing the inlet cavity; the high-temperature filter screen includes a resistance wire filter screen, and a polytetrafluoroethylene layer is coated on the outside of the resistance wire filter screen.

3. The steam recirculation heating device for sterilization and cleaning as described in claim 2, characterized in that: The high-temperature filter has a pore size of 20-50 mesh, the resistance wire filter is connected to an external power supply, and the temperature of the resistance wire filter is 280-300℃.

4. The steam recirculation heating device for sterilization and cleaning as described in claim 1, characterized in that: The middle part of the steam-water separator is connected to the top of the evaporator through a connecting pipe, and the lower part of the steam-water separator is connected to the bottom of the evaporator through a recirculation pipe. A steam outlet pipe is installed at the top of the steam-water separator.

5. The steam recirculation heating device for sterilization and cleaning as described in claim 4, characterized in that: The steam-water separator includes a separator housing, and several backflow baffles are arranged in the middle of the separator housing.

6. The steam recirculation heating device for sterilization and cleaning as described in claim 5, characterized in that: The backflow baffles are staggered, so that staggered airflow channels are formed between the backflow baffles and the inner wall of the separator housing.

7. The steam recirculation heating device for sterilization and cleaning as described in claim 5, characterized in that: The backflow baffle includes a side connecting plate fixedly connected to the inner wall of the separator housing, a V-shaped recessed plate at the end of the side connecting plate, and an extended connecting plate on the side of the V-shaped recessed plate away from the side connecting plate.

8. The steam recirculation heating device for sterilization and cleaning as described in claim 7, characterized in that: The V-shaped recessed plate is provided with a number of flow holes evenly distributed; the diameter of the flow holes is 1-10mm; the distance between adjacent flow holes is not less than the diameter of the holes; In adjacent backflow baffles, the V-shaped recessed plate of the upper backflow baffle is correspondingly set with the extended connecting plate of the lower backflow baffle.

9. A steam recirculation heating device for sterilization and cleaning as described in claim 6, characterized in that: An outer protective layer is provided on the outside of the backflow baffle, and the outer protective layer is prepared in the following manner: obtaining titanium oxide and silicon oxide nanoparticles; 6-8 parts by weight of nanoparticles are dispersed into a mixture of 30-40 parts by weight of acrylic emulsion and 10-15 parts by weight of polyurethane resin emulsion, wherein the solid content of the acrylic emulsion and polyurethane resin emulsion is 40-50 wt%, and the coating material is obtained after thorough mixing. The coating material is sprayed onto both sides of the backflow baffle, with no less than two spraying passes, and the thickness after drying is 0.3-0.7μm; Then, the reflux baffle is placed in a vacuum drying oven at 100-120℃ and heated for 10-12 hours.

10. The steam recirculation heating device for sterilization and cleaning as described in claim 9, characterized in that: The titanium dioxide and silicon dioxide nanoparticles were prepared in the following manner: Dissolve 5-6 parts by weight of tetrabutyl titanate in 100-120 parts by weight of ethanol, then add 8-10 parts by weight of ZSM-5 molecular sieve and stir continuously for no less than 10 hours; the ZSM-5 molecular sieve has a mesh size of 150-200 mesh. The first filter residue is obtained by filtration. The first filter residue is added to 50-60 times its mass of 0.1-0.2 mol / L hydrochloric acid solution and allowed to stand for reaction for no less than 24 hours. The secondary filter residue is obtained by filtration. The secondary filter residue is washed with deionized water, dried at 80-100℃ for 12-24 hours, then heated to 450-500℃ for 4-5 hours, cooled to room temperature, ground, and passed through a 500-600 mesh sieve to obtain titanium oxide and silicon oxide nanoparticles.

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