CN109865146B - Heat recovery system of sterilizer - Google Patents

Abstract

The invention relates to the technical field of heat recovery systems, in particular to a heat recovery system of a sterilizer, which comprises a sterilizer, a steam generator, a heat exchanger, a heat-preservation water tank and a water mixer, wherein the sterilizer comprises a heat exchanger, a heat-preservation water tank and a water mixer; the heat exchanger comprises a cold fluid inlet, a cold fluid outlet, a hot fluid inlet and a hot fluid outlet, the cold fluid inlet is communicated with the cold fluid outlet through a cold fluid pipe in the heat exchanger, the hot fluid inlet is communicated with the hot fluid outlet through a hot fluid pipe in the heat exchanger, and the hot fluid inlet is communicated with the waste steam outlet. The waste steam obtained after the sterilization of the sterilizer enters the heat exchanger for heat exchange, the waste water obtained after the heat exchange of the waste steam is discharged into sewage, and the hot water obtained after the heat exchange is supplied to the steam generator or is used for daily washing and bathing after passing through the water mixer; on one hand, the problems of air pollution and high-temperature waste water and waste steam discharge caused by high-temperature gas discharge are solved, on the other hand, the heat recovery is realized through heat exchange, and the purposes of energy conservation and emission reduction are realized.

Description

A heat recovery system for a sterilizer

technical field

The invention relates to the technical field of heat recovery systems, in particular to a heat recovery system for a sterilizer.

Background technique

Microorganisms widely exist in the surrounding environment, and some of them are pathogenic microorganisms. From the perspective of infection prevention, medical workers must strictly implement aseptic operations, and disinfect and sterilize the used items and working environment to ensure the normal progress of medical treatment and scientific research. Disinfection and sterilization are mainly through physical and chemical factors to hinder the main metabolism of microorganisms, or denature and solidify bacterial proteins, or destroy their genetic material, resulting in the death of microorganisms.

At present, the commonly used pulsating double-door high-pressure steam sterilizer produces and discharges a large amount of waste steam and high-temperature waste water with a temperature as high as 80-120 °C, which makes it difficult to discharge and seriously affects the environment around the facility.

In view of this, the present invention is proposed.

Contents of the invention

The purpose of the present invention is to provide a heat recovery system for a sterilizer, which reduces the temperature of the discharged waste steam and waste water through a heat exchanger, so that the waste water or waste steam produced by the high-pressure steam sterilizer can be discharged in the pipeline; The system recycles the heat energy in the discharged waste steam or waste water and utilizes it to achieve the purpose of energy saving and emission reduction.

In order to realize the above-mentioned purpose of the present invention, special adopt following technical scheme:

A heat recovery system for a sterilizer, comprising a sterilizer, a steam generator, a heat exchanger, an insulated water tank, and a water mixer;

Wherein, the sterilizer includes a sterilizing box and a steam generator connected to the sterilizing box, and the sterilizing box is provided with a waste steam outlet;

The heat exchanger includes a cold fluid inlet, a cold fluid outlet, a hot fluid inlet and a hot fluid outlet, the cold fluid inlet and the cold fluid outlet are connected through a cold flow pipe inside the heat exchanger, and the heat The fluid inlet and the hot fluid outlet are connected through the heat flow tube inside the heat exchanger, and the hot fluid inlet is connected with the waste steam outlet;

The heat preservation water tank includes a warm water outlet and a warm water inlet, the warm water outlet communicates with the cold fluid inlet, and the warm water inlet communicates with the cold fluid outlet;

The water mixer communicates with the cold fluid outlet.

In the sterilizer heat recovery system provided by the present invention, the high-temperature waste steam generated after the high-pressure steam sterilizer is sterilized is exchanged through the heat exchanger, and the cooled waste water is discharged into the sewer, and the hot water obtained from the heat exchange It can be stored in an insulated water tank, and can also be supplied to a water mixer as ordinary domestic hot water.

Preferably, the steam generator is provided with a water inlet, and the water inlet is connected with a tap water pipeline.

In the sterilizer heat recovery system provided by the present invention, a water inlet is set in the steam generator, and ordinary tap water is input into the steam generator through a circulating pump, so that water can be replenished at any time when the steam generator is short of water without shutting down Add to tap water manually.

Preferably, an activated carbon layer is arranged in the steam generator, and the activated carbon layer divides the steam generator into a raw water area and a pure water area.

In the sterilizer heat recovery system provided by the present invention, an activated carbon layer capable of filtering tap water is provided in the steam generator, so that impurities in tap water can be filtered to obtain pure water without other ions, ensuring steam generation The steam obtained in the device does not contain other substances.

Preferably, the water inlet on the steam generator communicates with the cold fluid outlet on the heat exchanger.

In the heat recovery system of the sterilizer provided by the present invention, the hot water obtained from heat exchange is supplied to the steam generator, so that the heat energy in the recovered and discharged waste steam and waste water can be utilized to achieve the purpose of energy saving and emission reduction.

Preferably, a filter valve is provided on the pipe connecting the thermal fluid inlet and the waste steam outlet.

In the heat recovery system of the sterilizer provided by the present invention, the steam and high-temperature waste water containing peculiar smell generated and discharged during the operation of the high-pressure steam sterilizer can be filtered through the filter valve, thereby reducing the impact on the surrounding environment.

Preferably, the heat preservation water tank is further provided with a water replenishment port, and the water replenishment port communicates with the purified water pipeline.

In the heat recovery system of the sterilizer provided by the present invention, because the water in the heat preservation water tank will be supplied to the steam generator or the water mixer at any time, the water in the heat preservation water tank may need to be supplemented at any time, and the water supply port is connected with the pure water pipeline , so that pure water can be replenished into the insulation water tank at any time, which improves the working efficiency of the hot water recovery system.

Preferably, temperature sensors are connected to the pipes connecting the cold fluid inlet, cold fluid outlet, hot fluid inlet and hot fluid outlet.

Preferably, the heat exchanger is a steam-water plate heat exchanger, and the heat flow pipes and cold flow pipes inside the heat exchanger are made of SU304 stainless steel.

Preferably, a thermal insulation layer is pasted on the outer layer of the thermal insulation water tank, and the raw material of the thermal insulation layer is composed of the following components by weight percentage:

Water-based polyurethane resin 20-30%, polytetrafluoroethylene 10-20%, sodium methylene dinaphthalene sulfonate 5-15%, glycol ether 0-10%, silicon-acrylic emulsion 0-5%, styrene-acrylic emulsion 0~10%, silicon carbide 0~5%, diatomaceous earth 5~10%, polysiloxane prepolymer 0~5%, benzophenone 5~10%, leveling agent 0~3%, disinfectant Foaming agent 0-3%, dispersant 0-3%, thickener 0-3%, stabilizer 0-3%.

In the sterilizer heat recovery system provided by the present invention, the heat loss in the heat preservation water tank can be effectively reduced by coating the heat insulation layer on the outer layer of the heat preservation water tank, and with the heat insulation layer composed of the above components, the , The heat loss rate is less than 10%.

Preferably, both the hot flow tube and the cold flow tube inside the heat exchanger are corrugated.

In the present invention, the waste steam obtained after the sterilizer is sterilized enters the heat exchanger for heat exchange, the waste water obtained after the heat exchange of the waste steam is discharged into the sewage, and the hot water obtained from the heat exchange is supplied to the steam generator or passed through the water mixer. It is used for daily washing and bathing; on the one hand, it solves the problems of air pollution caused by high-temperature gas discharge and the discharge of high-temperature wastewater and waste steam; on the other hand, it realizes heat recovery through heat exchange, and realizes the purpose of energy saving and emission reduction.

Description of drawings

In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the specific implementation or description of the prior art. Obviously, the accompanying drawings in the following description The drawings show some implementations of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work.

Fig. 1 is the structural representation of a preferred embodiment in the sterilizer heat exchange system provided by the present invention;

Fig. 2 is a structural schematic diagram of a preferred embodiment of the steam generator in the heat exchange system of the sterilizer provided by the present invention.

Reference signs:

1. Sterilization box; 2. Steam generator; 3. Heat exchanger; 4. Pure water tank; 5. Insulated water tank; 6. Water mixer; 7. Filter valve; 8. Temperature sensor; 9. Floor drain; 10 1. Circulation pump; 11. Liquid level controller; 12. Liquid level device; 13. Activated carbon layer; 14. Pressure pump.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components.

As shown in Figure 1, in a preferred embodiment of the sterilizer heat exchange system provided by the present invention, it includes a sterilizer, a steam generator 2, a heat exchanger 3, an insulated water tank 5 and a water mixer 6, wherein the The sterilizer includes a sterilizing box and a steam generator 2 communicated with the sterilizing box, and the sterilizing box is provided with a waste steam outlet; the heat exchanger 3 includes a cold fluid inlet and a cold fluid outlet , a hot fluid inlet and a hot fluid outlet, the cold fluid inlet and the cold fluid outlet are connected through the cold flow pipe inside the heat exchanger 3, and the hot fluid inlet and the hot fluid outlet are connected through the heat exchanger 3 The heat flow pipes inside the heater 3 are connected, and the hot fluid inlet is connected with the waste steam outlet; the heat preservation water tank 5 includes a warm water outlet and a warm water inlet, and the warm water outlet is connected with the cold fluid inlet, so The warm water inlet is connected with the cold fluid outlet, and a liquid level controller 11 and a liquid level gauge 12 are also arranged on the thermal insulation water tank 5, through which the liquid level situation in the thermal insulation water tank 5 can be observed, and then passed The liquid level controller 11 adjusts the water level in the thermal insulation water tank 5; the water mixer 6 is in communication with the cold fluid outlet.

In the present invention, on the thermal fluid side of the heat exchanger 3, the sterilizer is a common high-pressure steam sterilizer currently on the market, and the sterilization steam of the high-pressure steam sterilizer is provided by the steam generator 2, and the steam is generated The steam generator 2 is in communication with the sterilization box 1, and the steam generator 2 gradually heats the water to 121°C and supplies it to the sterilization box 1 for sterilization. Without any resistance, the waste steam is passed from the waste steam port to the hot fluid inlet of the heat exchanger 3 through the pipe, the waste steam flows in the heat flow tube inside the heat exchanger 3, and is discharged from the heat fluid outlet, and the waste steam is in the heat flow tube with another The cold fluid on the side is exchanged for heat, realizing the transfer of heat, and changing from a high-temperature vapor state to a low-temperature liquid state.

On the cold fluid side of the heat exchanger 3, the exchanged water in the heat preservation water tank 5 flows into the cold fluid inlet of the heat exchanger 3 through the warm water outlet through the pipe, and the exchanged water flows through the cold flow pipe inside the heat exchanger 3, It is discharged from the outlet of the cold fluid and flows back into the heat preservation water tank 5 , thus forming a circulation of exchange water in the cold flow pipe and the heat preservation water tank 5 . The cold fluid outlet is also connected with the water mixer 6, and the water mixer 6 can mix the exchanged water and tap water and then directly use it for domestic water. When the water mixer 6 needs to work, the valve on the pipeline between the water mixer 6 and the cold fluid outlet can be opened directly.

In the present invention, the waste steam obtained after the high-pressure steam sterilizer is sterilized enters the heat exchanger 3 for heat exchange, the low-temperature waste water obtained after the heat exchange of the waste steam is discharged into the sewage, and the hot water obtained by the heat exchange is supplied to the steam generator 2 or After passing through the water mixer 6, it is used for daily washing and bathing; on the one hand, it solves the problems of air pollution and high-temperature emissions caused by high-temperature gas emissions; on the other hand, it realizes heat recovery through heat exchange, and realizes the purpose of energy saving and emission reduction.

As shown in FIG. 2 , a water inlet is provided on the steam generator 2 , and the water inlet communicates with a tap water pipeline. A pressure pump 14, a filter and a valve are arranged on the tap water pipeline, so that tap water can flow into the steam generator 2 through the pressure pump 14 at any time, and there are also valves to control the flow rate and flow rate, in order to ensure the water quality in the steam generator 2 , a filter is arranged on the tap water pipeline, so that the tap water can be pre-filtered, so that the water reaching the steam generator 2 contains less impurities.

An activated carbon layer is arranged in the steam generator 2, and the activated carbon layer divides the steam generator 2 into a raw water area and a pure water area. Although there is a filter on the tap water pipeline, the filter on the pipeline often does not achieve a very good effect based on cost considerations, or the reverse osmosis membrane can achieve a very good filtering effect, but the cost of the reverse osmosis membrane is too high , will also reduce the flow rate of the water pipe. Therefore, the present invention arranges the activated carbon layer 13 in the steam generator 2, which can well filter out other ions or impurities in the tap water, so that the high-pressure steam generated in the steam generator 2 will not produce other impurities that affect the sterilization. Effect.

In a preferred embodiment of the present invention, the water inlet on the steam generator 2 communicates with the cold fluid outlet on the heat exchanger 3 . The present invention passes the exchanged water in the heat exchanger 3 directly into the steam generator 2, so that the water temperature in the steam generator 2 can be increased, and the heat energy of the exchanged water can be further utilized to achieve energy saving and emission reduction. Purpose.

In a preferred embodiment of the present invention, a filter valve 7 is provided on the pipe connecting the thermal fluid inlet and the waste steam outlet. The filter valve 7 can eliminate impurities in the exhaust steam, and can remove the peculiar smell in the exhaust steam. The filter valve 7 commonly used at present can be a Y-type filter valve, and the Y-type filter valve can conveniently eliminate the impurities retained in the filter valve 7 . In this way, the waste water after heat exchange can be directly discharged through the floor drain 9 without polluting the existing environment.

In a preferred embodiment of the present invention, the heat preservation water tank 5 is further provided with a water replenishment port, and the water replenishment port is connected with a purified water pipeline. In the heat recovery system of the sterilizer provided by the present invention, because the water in the thermal insulation water tank 5 will be supplied to the steam generator 2 or the water mixer 6 at any time, the water in the thermal insulation water tank 5 may need to be supplemented at any time, and the water supply port and the pure The water pipes are connected so that pure water can be replenished into the thermal water tank 5 at any time, which improves the working efficiency of the hot water recovery system.

In a preferred embodiment of the present invention, temperature sensors 8 are connected to the pipes connecting the cold fluid inlet, cold fluid outlet, hot fluid inlet and hot fluid outlet. The flow rate and flow rate of the hot fluid and the cold fluid can be well controlled through the temperature sensor 8, and then the heat exchange efficiency can be maximized.

In a preferred embodiment of the present invention, the heat exchanger is a steam-water plate heat exchanger, and the heat flow pipes and cold flow pipes inside the heat exchanger are both made of SU304 stainless steel.

In another preferred embodiment of the present invention, the hot flow tubes and cold flow tubes inside the heat exchanger 3 can also be made of glass tubes. At present, the common heat exchange pipes on the market are metal pipes or stainless steel pipes. At present, metal pipes or stainless steel pipes will encounter a big problem in the process of use, which is corrosion of pipes. Especially for steam pipes, because steam pipes often contain a large amount of oxygen and are always in a high temperature environment above 100 degrees, these pipes are prone to oxidation or other corrosion. In the long run, the service life of the pipeline will be greatly reduced. Especially the pipes in the heat exchanger 3 are inconvenient to disassemble and difficult to replace. If there is a problem with the pipes, the whole machine may need to be disassembled and repaired, and the maintenance cost of the equipment is very high. Therefore, the use of glass tubes for heat exchange can well solve this anti-corrosion problem. But it is well known that the heat transfer efficiency of glass is much lower than that of metal, so how to provide a glass material with high heat transfer performance is very important.

In an embodiment of the present invention, the glass tube is made of the following weight percent components:

SiO ₂ 50-55%, Al ₂ O ₃ 20-30%, B ₂ O ₃ 0-10%, CeO ₂ 0-5%, CaO 0-4%, MgO 0-3%, BaO 1-4%, SrO 0～1%, ZnO 0～4%, ZrO ₂ 0～1%, TiO ₂ 0～4%, Y ₂ O ₃ 0～4%, La ₂ O ₃ 0～2%, Gd ₂ O ₃ 0～ 3%, Bi ₂ O ₃ 0~1%, WO ₃ 0~2%, Nb ₂ O ₅ 0~5%, Ta ₂ O ₅ 0~1%, K ₂ O 0~4%, TeO ₂ 0~1.5% , Lu ₂ O ₃ 0-1%, F 0-2%.

As the forming method of the glass tube, the float method, the hole-retaining down-drawing method, the overflow down-drawing method, and the re-down-drawing method can be used.

Table 1 shows the thermal conductivity coefficients of several common materials.

【Table 1】

The above thermal conductivity refers to the heat transfer through an area of 1 square meter within 1 second (1S) of a material with a thickness of 1m and a temperature difference of 1 degree (K) between the two sides of the material under stable heat transfer conditions. The unit is W /(m·K).

Table 2 shows several examples of the composition of the glass tube of the present invention.

【Table 2】

It can be seen from Table 2 that the glass tube composed of the above components can achieve a relatively good heat transfer effect, especially when the thickness of the glass tube is set at 2-3cm, the heat transfer efficiency of the glass tube is comparable to that of the currently commonly used The gap between the heat transfer efficiency of metal tubes is very small.

In a heat recovery system for a sterilizer provided in an embodiment of the present invention, a heat insulation layer is bonded to the outer layer of the thermal insulation water tank 5, and the raw material of the heat insulation layer is composed of the following components by weight percentage:

Water-based polyurethane resin 20-30%, polytetrafluoroethylene 10-20%, sodium methylene dinaphthalene sulfonate 5-15%, glycol ether 0-10%, silicon-acrylic emulsion 0-5%, styrene-acrylic emulsion 0~10%, silicon carbide 0~5%, diatomaceous earth 5~10%, polysiloxane prepolymer 0~5%, benzophenone 5~10%, leveling agent 0~3%, disinfectant Foaming agent 0-3%, dispersant 0-3%, thickener 0-3%, stabilizer 0-3%.

[Example 1]

The raw material formula of the heat insulation layer includes: 25% water-based polyurethane resin, 15% polytetrafluoroethylene, 13% sodium methylene dinaphthalene sulfonate, 5% glycol ether, 3% silicone acrylic emulsion, 7% styrene acrylic emulsion, Silicon carbide 3%, diatomaceous earth 7%, polysiloxane prepolymer 3%, benzophenone 7%, leveling agent 2%, defoamer 2%, dispersant 3%, thickener 2% , Stabilizer 3%. Add the above heat insulation layer raw materials into a strong mixer and stir for 5 minutes to obtain the desired heat insulation layer material.

[Example 2]

The raw material formula of the heat insulation layer includes: 30% water-based polyurethane resin, 20% polytetrafluoroethylene, 10% sodium methylene dinaphthalene sulfonate, 8% glycol ether, 5% silicone acrylic emulsion, 5% styrene acrylic emulsion, Silicon carbide 5%, diatomaceous earth 5%, polysiloxane prepolymer 2%, benzophenone 5%, leveling agent 1%, defoamer 1%, dispersant 1%, thickener 1% , Stabilizer 1%. Add the above-mentioned anti-wear layer raw materials into a strong mixer and stir for 8 minutes to obtain the required heat insulation layer material.

The heat insulation layer materials of Embodiment 1 and Embodiment 2 were attached to the outer layer of the heat preservation water tank 5 respectively, and then the water temperature variation in the heat preservation water tank 5 was measured within 12 hours as shown in Table 3 (under shutdown state).

【table 3】

In Table 3, Comparative Example 1 is the test result without any thermal insulation material; Comparative Example 2 is the test result with commercially available conventional thermal insulation board (Jiangsu Jianya Energy Saving Building Materials Co., Ltd., model JY-1); The three figures fit the test results of commercially available conventional plastic foam (Hefei Xinbang Packaging Products Co., Ltd.).

It can be seen from the above table that Example 1 and Example 2 have good thermal insulation performance within 12 hours, which is much higher than that of Comparative Example 1 without any thermal insulation material, and is also better than that of Comparative Example 1 with thermal insulation board and plastic foam. The thermal insulation performance of comparative example 2 and comparative example 3 is slightly higher.

In the present invention, both the hot flow tube and the cold flow tube inside the heat exchanger are corrugated.

In another preferred embodiment of the present invention, the heat flow tubes and cold flow tubes inside the heat exchanger 3 are both cylindrical and spiral; wherein the shape of the heat flow tubes satisfies the following formula:

The shape of the cold flow tube satisfies the following formula:

In the formula, L ₁ is the distance from the hot fluid inlet to the hot fluid outlet; L ₂ is the distance from the cold fluid inlet to the cold fluid outlet; H ₁ is the pitch of the hot flow tube; H ₂ is the pitch of the cold flow tube; D ₁ is the heat flow The diameter of the cylindrical bottom surface of the tube; _D2 is the diameter of the cylindrical bottom surface of the cold flow tube.

The use of cylindrical spiral cold flow tubes and hot flow tubes can increase the area of heat exchange and improve the efficiency of heat exchange. In addition, the heat flow tube is to release heat from the tube, so it is not suitable for the pipeline pitch density to be too large during the heat exchange process, which will cause heat accumulation. Of course, too small pipeline pitch density will also reduce the heat exchange efficiency, so The above-mentioned heat flow tube satisfying the structure of the above formula 1 can achieve the best heat exchange efficiency. In addition, for the cold flow tube, the heat is transferred to the tube, so the pitch density should not be too small during the heat exchange process, which will cause heat loss. Of course, the high pitch density of the pipeline will also reduce the heat exchange efficiency, so the above meets the above requirements. The cold flow with the structure of Formula 2 can achieve the best heat exchange efficiency.

In another embodiment of the present invention, the heat flow pipes and cold flow pipes inside the heat exchanger 3 are also helical; however, the helical pipes are helical with uneven pitch and bottom diameter. For the heat flow tube, due to the input of high-pressure steam at the entrance of the heat fluid, the speed and heat exchange efficiency of the steam will be lower than that of liquid water. Therefore, from the heat fluid inlet to the heat fluid outlet, the pitch of the heat flow pipe is gradually increased. And the diameter of the bottom surface is gradually reduced. For the cold flow tube, since it is liquid water at the cold fluid inlet and the cold fluid outlet, there is no difference in flow rate and heat exchange, but the water temperature at the cold fluid inlet is often lower than the water temperature at the cold fluid outlet, so in The heat exchange efficiency at the cold fluid inlet is higher than that at the cold fluid outlet, so from the cold fluid inlet to the cold fluid outlet, the pitch of the cold flow pipe gradually decreases, and the diameter of the bottom surface gradually increases. The present invention can maximize the recovery rate of heat through the design of the cold flow pipe and the heat flow pipe with the above structure.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (5)

1. A heat recovery system for a sterilizer, comprising a sterilizer, a steam generator, a heat exchanger, an insulated water tank, and a water mixer; Wherein, the sterilizer is connected with the steam generator, and a waste steam outlet is arranged on the sterilizer; The heat exchanger includes a cold fluid inlet, a cold fluid outlet, a hot fluid inlet and a hot fluid outlet, the cold fluid inlet and the cold fluid outlet are connected through a cold flow pipe inside the heat exchanger, and the heat The fluid inlet and the hot fluid outlet are connected through the heat flow tube inside the heat exchanger, and the hot fluid inlet is connected with the waste steam outlet; The heat preservation water tank includes a warm water outlet and a warm water inlet, the warm water outlet communicates with the cold fluid inlet, and the warm water inlet communicates with the cold fluid outlet; The water mixer communicates with the cold fluid outlet; The heat flow tubes and cold flow tubes inside the heat exchanger are made of glass tubes, and the glass tubes are composed of the following weight percentage components: SiO ₂ 36%, Al ₂ O ₃ 25%, B ₂ O ₃ 7.5%, CeO ₂ 3%, CaO 1%, MgO 1%, BaO 2%, SrO 1%, ZnO 2%, ZrO ₂ 0.5%, TiO ₂ 1%, Y ₂ O ₃ 3%, La ₂ O ₃ 2%, Gd ₂ O ₃ 3%, Bi ₂ O ₃ 1%, WO ₃ 2%, Nb ₂ O ₅ 2%, Ta ₂ O ₅ 1% , K ₂ O 3%, TeO ₂ 1%, Lu ₂ O ₃ 1%, F 1%; The heat flow tubes and cold flow tubes inside the heat exchanger (3) are cylindrical and spiral; the shape of the heat flow tubes satisfies the following formula:

; The shape of the cold flow tube satisfies the following formula:

; In the formula, L1 is the distance from the hot fluid inlet to the hot fluid outlet; L2 is the distance from the cold fluid inlet to the cold fluid outlet; H1 is the pitch of the heat flow tube; H2 is the pitch of the cold flow tube; D1 is the diameter of the bottom surface of the cylinder of the heat flow tube ; D2 is the diameter of the bottom surface of the cylinder of the cold flow tube; Or from the inlet of the hot fluid to the outlet of the hot fluid, the pitch of the heat flow pipe increases gradually, and the diameter of the bottom surface gradually decreases; from the inlet of the cold fluid to the outlet of the cold fluid, the pitch of the cold flow pipe Gradually decreases, and its bottom diameter gradually increases; An activated carbon layer is arranged in the steam generator, and the activated carbon layer divides the steam generator into a raw water area and a pure water area; The water inlet on the steam generator communicates with the cold fluid outlet on the heat exchanger; A thermal insulation layer is pasted on the outer layer of the thermal insulation water tank, and the raw material of the thermal insulation layer is composed of the following components by weight percentage: Waterborne polyurethane resin 20~30%, polytetrafluoroethylene 10~20%, sodium methylene dinaphthalene sulfonate 5~15%, glycol ether 0~10%, silicone acrylic emulsion 0~5%, styrene acrylic emulsion 0~10%, silicon carbide 0~5%, diatomite 5~10%, polysiloxane prepolymer 0~5%, benzophenone 5~10%, leveling agent 0~3%, disinfectant Foaming agent 0~3%, dispersant 0~3%, thickener 0~3%, stabilizer 0~3%. 2. A heat recovery system for a sterilizer according to claim 1, wherein a water inlet is provided on the steam generator, and the water inlet is connected to a tap water pipeline. 3. A heat recovery system for a sterilizer according to claim 1, characterized in that a filter valve is provided on the pipeline connecting the hot fluid inlet and the waste steam outlet. 4 . The heat recovery system for a sterilizer according to claim 1 , wherein a water replenishment port is provided on the heat preservation water tank, and the water replenishment port communicates with a purified water pipeline. 5. A heat recovery system for a sterilizer according to claim 1, wherein temperature sensors are connected to the pipes connecting the cold fluid inlet, cold fluid outlet, hot fluid inlet and hot fluid outlet .

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