Buffer tank and steam generation system

Abstract

The present invention discloses a buffer tank and a steam generating system. The buffer tank comprises a tank body, the tank body has a closed cavity and a first port, a second port and a third port which are all connected to the closed cavity. The first port is used to connect the tank body with a liquid inlet pipeline, the second port is used to connect the tank body with an evaporator through a first connecting pipeline, and the third port is used to connect the tank body with a steam return pipeline. A first nozzle is arranged in the buffer tank, and the first nozzle is connected with the liquid inlet pipeline. The liquid inlet pipeline transports raw water into the closed cavity, the first nozzle sprays the raw water into the closed cavity, and the steam return pipeline transports the steam refluxed in the evaporator into the closed cavity, so that the steam is mixed with the sprayed raw water to achieve heating of the raw water. Since the first nozzle sprays the raw water into the closed cavity, the raw water and the steam are mixed more evenly, the heating efficiency of the steam on the raw water is improved, and the temperature of the raw water entering the evaporator through the first connecting pipeline meets the standard.

Description

Technical Field

[0001] The present invention relates to the technical field of steam preparation, and in particular to a buffer tank and a steam generating system. Background Art

[0002] Pure steam generator is an important equipment in the pharmaceutical industry. The pure steam it produces can be used for moist heat sterilization and other processes such as disinfection of equipment and pipelines. According to the film evaporation form of raw water in the tube bundle of the evaporator, it can be divided into falling film pure steam generator and rising film pure steam generator.

[0003] The rising film pure steam generator does not need to form a film with the help of a liquid distribution device. It only needs to ensure that the temperature of the raw water entering the evaporator is close to or greater than the boiling point to obtain a good heat transfer efficiency. However, most of the current rising film pure steam generators have the problem of insufficient raw water temperature entering the evaporator, which makes it difficult to ensure heat transfer efficiency. Summary of the invention

[0004] Based on this, it is necessary to provide a buffer tank and a steam generating system; the buffer tank can heat the raw water entering the evaporator so that the temperature of the raw water entering the evaporator reaches close to or greater than the boiling point, ensuring the heat transfer efficiency entering the evaporator and the evaporation efficiency of the raw water in the evaporator; the steam generating system includes the aforementioned buffer tank, which solves the problem of insufficient temperature of the raw water entering the evaporator, and makes the heat transfer efficiency of the evaporator of the steam generating system higher.

[0005] The technical solution is as follows:

[0006] One embodiment provides a cache tank, including a tank body, the tank body having a closed cavity and a first port, a second port and a third port connected to the closed cavity, the first port is used to connect the tank body with a liquid inlet pipeline, the second port is used to connect the tank body with an evaporator through a first connecting pipeline, the third port is used to connect the tank body with a return steam pipeline, and a first nozzle is provided in the cache tank, and the first nozzle is connected to the liquid inlet pipeline.

[0007] In the above-mentioned buffer tank, the liquid inlet pipeline conveys raw water into the closed cavity, the first nozzle sprays the raw water into the closed cavity, and the return steam pipeline conveys the pure steam refluxed in the evaporator into the closed cavity, so that the high-temperature pure steam is mixed with the sprayed raw water to achieve heating of the raw water; since the first nozzle sprays the raw water into the closed cavity, the mixing of raw water and pure steam is more uniform, which improves the heating efficiency of pure steam for raw water, and makes the temperature of the raw water entering the evaporator through the first connecting pipeline meet the standard, thereby improving the heat transfer efficiency in the evaporator.

[0008] The technical solution is further described below:

[0009] In one of the embodiments, a second nozzle is further provided in the tank body, the second nozzle is connected to the steam return pipeline, and the second nozzle is used to spray the pure steam refluxed in the evaporator into the closed cavity.

[0010] In one embodiment, a degassing member is further provided in the tank body, the degassing member is provided between the first nozzle and the second nozzle, the tank body further has a fourth port communicating with the closed cavity, the fourth port is used to connect the tank body with the first exhaust pipe;

[0011] The degassing member is used to remove non-condensable gas in the raw water sprayed from the first nozzle, and the first exhaust steam pipeline is used to exhaust the non-condensable gas.

[0012] In one of the embodiments, a first one-way valve is provided on the first exhaust steam pipeline, and the first one-way valve is used to prevent substances outside the first exhaust steam pipeline from entering the buffer tank; or / and a first regulating valve is provided on the first exhaust steam pipeline.

[0013] Another embodiment provides a steam generation system, comprising:

[0014] Evaporator;

[0015] A cache tank as described in any of the above technical solutions;

[0016] A preheating component is arranged on the liquid inlet pipeline, and is used to preheat the raw water entering the cache tank.

[0017] In the above-mentioned steam generating system, the preheating component preheats the raw water entering the buffer tank, and the buffer tank further heats the preheated raw water, so that the temperature of the raw water entering the evaporator from the buffer tank is close to or higher than the boiling point, thereby improving the heat transfer efficiency of the evaporator.

[0018] The technical solution is further described below:

[0019] In one embodiment, the preheating assembly includes a first heat exchanger, a first heat exchange pipeline and a first valve arranged on the first heat exchange pipeline, the first heat exchanger is arranged on the liquid inlet pipeline, the buffer tank is located between the first heat exchanger and the evaporator, and both ends of the first heat exchange pipeline are respectively connected to the evaporator and the first heat exchanger;

[0020] The raw water that has not evaporated in the evaporator forms concentrated water, and the concentrated water enters the first heat exchanger through the first heat exchange pipeline to exchange heat with the raw water on the liquid inlet pipeline.

[0021] In one embodiment, the evaporator is connected to a steam inlet pipeline, the steam inlet pipeline is used to transport a heat exchange medium, and the heat exchange medium exchanges heat with the raw water in the evaporator and condenses to obtain a condensate;

[0022] The preheating component includes a second heat exchanger, a second heat exchange pipeline and a first steam trap arranged on the second heat exchange pipeline. The second heat exchanger is arranged on the liquid inlet pipeline. The buffer tank is located between the second heat exchanger and the evaporator. The two ends of the second heat exchanger are respectively connected to the evaporator and the second heat exchanger. The condensate enters the second heat exchanger through the second heat exchange pipeline to exchange heat with the raw water on the liquid inlet pipeline.

[0023] In one embodiment, the evaporator includes an upper box and a lower box connected to the upper box, two ends of the return steam pipeline are respectively connected to the upper box and the buffer tank, and two ends of the first connecting pipeline are respectively connected to the lower box and the buffer tank;

[0024] A spiral water vapor separator is provided in the upper box body, and a third heat exchanger is provided in the lower box body. The raw water in the tank body enters the lower box body through the first connecting pipe and is heat-exchanged by the third heat exchanger to form steam. The steam enters the upper box body and is separated from the water vapor by the spiral water vapor separator to obtain pure steam.

[0025] In one embodiment, the spiral water vapor separator separates the steam into pure steam and heavy water, and the upper box is also connected to a first liquid drain pipeline, and the first liquid drain pipeline is used to discharge the heavy water;

[0026] A second one-way valve is arranged on the first liquid discharge pipeline, and the second one-way valve is used to prevent substances outside the first liquid discharge pipeline from entering the upper box body; a second steam trap is also arranged on the first liquid discharge pipeline.

[0027] In one embodiment, the third heat exchanger has a heat exchange tube, in which the raw water exchanges heat and forms steam; the evaporator is also provided with a liquid level detector, which is used to detect the liquid level height of the raw water in the heat exchange tube; the liquid inlet pipeline is also provided with a water pump and a flow meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] In addition, the drawings are not drawn in a 1:1 scale, and the relative sizes of various elements are drawn only as examples in the drawings and are not necessarily drawn in true scale.

[0031] Figure 1 is a schematic diagram of the overall structure of a steam generation system in an embodiment of the present invention;

[0032] Figure 2 for Figure 1 A schematic diagram of the arrangement structure of the evaporator and the buffer tank in the embodiment;

[0033] Figure 3 for Figure 1 Schematic diagram of the overall structure of the cache tank in the embodiment.

[0034] Notes on the attached drawings:

[0035] 100, cache tank; 101, closed chamber; 110, first nozzle; 120, second nozzle; 130, degassing element; 210, upper box; 211, spiral water vapor separator; 220, lower box; 221, heat exchange tube; 230, liquid level detector; 310, first heat exchanger; 320, first heat exchange pipeline; 321, first valve; 330, second heat exchanger; 340, second heat exchange pipeline; 341, first steam trap; 410, liquid inlet pipeline; 411, water pump; 412, flow meter ; 413, second regulating valve; 420, steam inlet pipeline; 421, third regulating valve; 430, first connecting pipeline; 440, steam return pipeline; 450, first exhaust pipeline; 451, first non-return valve; 452, first regulating valve; 453, exhaust extension pipeline; 460, first liquid discharge pipeline; 461, second non-return valve; 462, second steam trap; 470, steam supply pipeline; 471, fourth regulating valve; 480, sampling pipeline; 481, sampling condenser; 490, second liquid discharge pipeline. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below with reference to the accompanying drawings:

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0038] Please refer to Figures 1 to 3 One embodiment provides a cache tank 100, including a tank body, the tank body having a closed cavity 101 and a first port, a second port and a third port all connected to the closed cavity 101, the first port being used to connect the tank body with a liquid inlet pipeline 410, the second port being used to connect the tank body with an evaporator through a first connecting pipeline 430, the third port being used to connect the tank body with a steam return pipeline 440, and a first nozzle 110 being provided in the cache tank 100, the first nozzle 110 being connected to the liquid inlet pipeline 410.

[0039] The cache tank 100, such as Figure 3 As shown, the liquid inlet pipeline 410 transports raw water into the closed chamber 101, the first nozzle 110 sprays the raw water into the closed chamber 101, and the return steam pipeline 440 transports the pure steam refluxed in the evaporator into the closed chamber 101, so that the steam is mixed with the sprayed raw water to achieve heating of the raw water; because the first nozzle 110 sprays the raw water into the closed chamber 101, the raw water and pure steam are mixed more evenly, the heating efficiency of the pure steam to the raw water is improved, and the temperature of the raw water entering the evaporator through the first connecting pipeline 430 meets the standard, thereby improving the heat transfer efficiency in the evaporator.

[0040] Since the raw water in the cache tank 100 is heated to a temperature close to or greater than the boiling point of evaporation, the raw water can quickly form a film in the evaporator (in the heat exchange tube 221 of the third heat exchanger of the evaporator), and a very small heat exchange area can heat the raw water to the boiling point and evaporate it, and the evaporation amount can be increased by more than 10% under the same heat exchange area. At the same time, part of the pure steam flows back to the cache tank 100 and mixes evenly with the raw water for heating, so that the raw water is always in a high temperature state, meeting the user's demand for rapid response to the full load usage of pure steam.

[0041] Optionally, the first spray head 110 is a spray ball. The raw water is purified water.

[0042] In one embodiment, please refer to Figures 1 to 3A second nozzle 120 is also provided in the tank body. The second nozzle 120 is connected to the return steam pipeline 440 . The second nozzle 120 is used to spray the pure steam refluxed in the evaporator into the closed chamber 101 .

[0043] Part of the pure steam in the evaporator flows back into the tank body through the return steam pipeline 440, and is sprayed into the closed chamber 101 through the second nozzle 120. The second nozzle 120 sprays the pure steam so that it can be mixed more evenly with the sprayed raw water, thereby improving the heating efficiency of the raw water by the pure steam.

[0044] In one embodiment, please refer to Figure 3 At least two second nozzles 120 are provided and are arranged at intervals on the steam return pipeline 440 .

[0045] like Figure 3 In the illustrated embodiment, two second nozzles 120 are provided, both of which are located in the closed chamber 101 , and the two second nozzles 120 are arranged on the left and the right of the portion of the return steam pipeline 440 extending into the closed chamber 101 .

[0046] In one embodiment, please refer to Figure 3 A degassing component 130 is also provided in the tank body, and the degassing component 130 is provided between the first nozzle 110 and the second nozzle 120. The tank body also has a fourth port connected to the closed cavity 101, and the fourth port is used to connect the tank body with the first exhaust pipe 450.

[0047] The degassing element 130 is used to remove non-condensable gas in the raw water sprayed by the first nozzle 110, and the first exhaust pipe 450 is used to discharge the non-condensable gas.

[0048] During operation, raw water is sprayed into the closed chamber 101 through the first nozzle 110, and the degassing component 130 isolates and removes the non-condensable gas in the sprayed raw water, and discharges it through the first exhaust steam pipeline 450, so as to improve the purity of the prepared pure steam; at the same time, the non-condensable gas is removed before evaporation, which can reduce the thermal resistance between the steam and the inner wall of the heat exchange tube 221 of the third heat exchanger in the evaporator, and improve the heat transfer efficiency of the rising film evaporator.

[0049] like Figure 3 In the illustrated embodiment, the first nozzle 110 and the second nozzle 120 are respectively located at the upper and lower parts of the closed chamber 101, and the desteaming component 130 is located in the middle part of the closed chamber 101. The first nozzle 110 sprays raw water from above, and after the non-condensable gas therein is isolated and removed by the desteaming component 130, the raw water enters the bottom and is fully mixed with the pure steam sprayed from the second nozzle 120 to improve the heating efficiency.

[0050] Optionally, the desteaming component 130 is a filling device, which can, on the one hand, remove non-condensable gases in the raw water sprayed from the first nozzle 110, and on the other hand, can extend the time that the sprayed raw water stays in the buffer tank 100 through structures such as grooves provided on the filling device, so that the raw water is fully mixed with pure steam, thereby improving the heating efficiency.

[0051] Specifically, the spray ball evenly sprays purified water with a certain temperature and pressure onto the packing device to achieve continuous removal of non-condensable gas in the purified water. The refluxed high-temperature pure steam is sprayed out through the second nozzle 120 (which can be a degassing device) and fully mixed with the purified water to ensure that the purified water can enter the evaporator at a temperature close to the boiling point of evaporation.

[0052] In one embodiment, please refer to Figure 2 The first exhaust steam pipeline 450 is provided with a first one-way valve 451 , and the first one-way valve 451 is used to prevent substances outside the first exhaust steam pipeline 450 from entering the cache tank 100 .

[0053] Since the raw water is heated in the buffer tank 100 and then transported to the evaporator for evaporation, in order to prevent the gas or liquid outside the first exhaust pipeline from flowing back into the buffer tank 100, a first one-way valve 451 is provided to ensure the quality of the prepared pure steam.

[0054] In one embodiment, please refer to Figure 2 The first exhaust steam pipeline 450 is provided with a first regulating valve 452 , and the first regulating valve 452 is used to adjust the air pressure on the first exhaust steam pipeline 450 .

[0055] Please refer to Figure 1 and Figure 2 Another embodiment provides a steam generation system, comprising:

[0056] Evaporator;

[0057] The cache tank 100 as described in any of the above embodiments;

[0058] A preheating component is disposed on the liquid inlet pipeline 410 , and is used to preheat the raw water entering the cache tank 100 .

[0059] In the steam generating system, the preheating component preheats the raw water entering the buffer tank 100, and the buffer tank 100 further heats the preheated raw water, so that the temperature of the raw water entering the evaporator from the buffer tank 100 is close to or higher than the boiling point, thereby improving the heat transfer efficiency of the evaporator.

[0060] In one embodiment, please refer to Figure 1The preheating component includes a first heat exchanger 310, a first heat exchange pipeline 320 and a first valve 321 arranged on the first heat exchange pipeline 320, the first heat exchanger 310 is arranged on the liquid inlet pipeline 410, the buffer tank 100 is located between the first heat exchanger 310 and the evaporator, and the two ends of the first heat exchange pipeline 320 are respectively connected to the evaporator and the first heat exchanger 310.

[0061] The raw water that has not evaporated in the evaporator forms concentrated water, and the concentrated water enters the first heat exchanger 310 through the first heat exchange pipeline 320 to exchange heat with the raw water on the liquid inlet pipeline 410 .

[0062] like Figure 1 In the embodiment shown, the raw water heated by steam in the buffer tank 100 enters the evaporator through the first connecting pipe 430, and exchanges heat with the heat exchange medium (such as industrial steam) input from the steam inlet pipe 420 in the evaporator, so that the raw water absorbs heat and forms steam. In this process, a cavity is formed at the bottom of the evaporator for temporarily storing the incoming raw water. During the operation of the steam generation system, part of the raw water does not evaporate as expected, and this part of water becomes concentrated water. The concentrated water is discharged into the first heat exchanger 310 through the first heat exchange pipe 320 at regular time intervals according to the system settings. Since these concentrated waters have a higher temperature, they can exchange heat with the raw water in the first heat exchanger 310, thereby realizing the preheating of the raw water.

[0063] When the concentrated water is discharged according to the set time interval, when the concentrated water needs to be discharged, the first valve 321 is opened to discharge the concentrated water, and when the concentrated water does not need to be discharged, the first valve 321 is closed to stop discharging the concentrated water.

[0064] In actual use, a certain time interval can be set to discharge the concentrated water. Of course, when the machine is shut down, the concentrated water can be drained through the first heat exchange pipeline 320.

[0065] Optionally, the first valve 321 is a pneumatic diaphragm valve.

[0066] In one embodiment, please refer to Figure 1 The evaporator is connected to a steam inlet pipeline 420, and the steam inlet pipeline 420 is used to transport a heat exchange medium. The heat exchange medium exchanges heat with the raw water in the evaporator and condenses to obtain a condensate.

[0067] like Figure 1As shown, the preheating component includes a second heat exchanger 330, a second heat exchange pipeline 340 and a first steam trap 341 arranged on the second heat exchange pipeline 340; the second heat exchanger 330 is arranged on the liquid inlet pipeline 410; the buffer tank 100 is located between the second heat exchanger 330 and the evaporator; the two ends of the second heat exchanger 330 are respectively connected to the evaporator and the second heat exchanger 330; the condensate enters the second heat exchanger 330 through the second heat exchange pipeline 340 to exchange heat with the raw water on the liquid inlet pipeline 410.

[0068] Different from the first heat exchanger 310 whose heat source comes from the concentrated water in the evaporator, the second heat exchanger 330's heat source comes from the condensed water formed by the condensation of industrial steam and raw water in the evaporator after heat exchange. The condensed water after heat exchange still has a relatively high temperature, so it can be used to preheat the raw water for reuse.

[0069] The first steam trap 341 is provided to ensure that only condensate (such as condensate formed after heat exchange between industrial steam and raw water) can enter the second heat exchanger 330, and uncondensed industrial steam cannot enter the second heat exchanger 330.

[0070] In one embodiment, please refer to Figure 1 A first heat exchanger 310 and a second heat exchanger 330 are provided on the liquid inlet pipeline 410 , and the second heat exchanger 330 is located between the first heat exchanger 310 and the cache tank 100 .

[0071] like Figure 1 In the illustrated embodiment, the first heat exchanger 310 uses concentrated water to perform a first preheating on the raw water in the liquid inlet pipe 410; then, the second heat exchanger 330 uses condensed water formed by industrial steam to preheat the raw water after the first preheating again; then, the raw water after the two preheatings enters the buffer tank 100, and the steam flowing back into the buffer tank 100 heats the raw water after the two preheatings again, thereby ensuring that the temperature of the raw water entering the evaporator from the buffer tank 100 is close to or higher than the boiling point, ensuring the heat transfer efficiency in the evaporator, and ensuring the evaporation efficiency of the raw water in the evaporator.

[0072] In one embodiment, please refer to Figure 1 and Figure 2 The evaporator includes an upper box body 210 and a lower box body 220 connected to the upper box body 210, two ends of the return steam pipeline 440 are respectively connected to the upper box body 210 and the cache tank 100, and two ends of the first connecting pipeline 430 are respectively connected to the lower box body 220 and the cache tank 100.

[0073] In one embodiment, please refer to Figure 1 and Figure 2 A spiral water vapor separator 211 is provided in the upper box body 210, and a third heat exchanger is provided in the lower box body 220. The raw water in the tank body enters the lower box body 220 through the first connecting pipe 430 and is heat-exchanged by the third heat exchanger to form steam. The steam enters the upper box body 210 and is separated from the water vapor by the spiral water vapor separator 211 to obtain pure steam.

[0074] like Figure 1 and Figure 2 In the embodiment shown, the evaporator has an upper box 210 and a lower box 220. The raw water entering the evaporator from the buffer tank 100 first exchanges heat with the industry through the third heat exchanger to form steam. The steam moves along the inner wall of the heat exchange tube 221 of the third heat exchanger toward the upper box 210, that is, the evaporator is a rising film evaporator. After the steam enters the upper box 210, it is processed by the spiral water vapor separator 211 to separate pure steam.

[0075] Traditional evaporators need to be equipped with independent separation devices, which occupy a large space. However, by having the upper box 210 built-in spiral water vapor separator 211, not only the problem of large space is solved, but also pure steam is obtained after water vapor separation, thereby improving the quality of pure steam.

[0076] The air pressure in the upper box 210 is greater than the air pressure in the buffer tank 100 . Therefore, part of the steam in the upper box 210 will flow back into the buffer tank 100 through the return steam pipeline 440 , thereby heating the raw water in the buffer tank 100 .

[0077] In one embodiment, please refer to Figure 1 The spiral water vapor separator 211 separates the steam into pure steam and heavy water. The upper box 210 is also connected to a first drain pipe 460, and the first drain pipe 460 is used to discharge the heavy water.

[0078] like Figure 1 In the illustrated embodiment, the evaporator is connected to a steam supply pipeline 470, and the spiral water vapor separator 211 separates the steam from the lower box 220 into pure steam and heavy water. When pure steam is needed, the pure steam is output to the steam-using terminal through the steam supply pipeline 470, and the heavy water is discharged through the first liquid discharge pipeline 460. In addition, the heavy water is discharged through the first liquid discharge pipeline 460 and no longer flows into the raw water to be evaporated, thereby improving and ensuring the quality of the pure steam.

[0079] In one embodiment, a fourth regulating valve 471 is provided on the steam supply pipeline 470 to regulate the supply and stop of pure steam.

[0080] In one embodiment, please refer to Figure 1The first heat exchanger 310 is connected to the first drain pipe 460 through a pipe to discharge the concentrated water after heat exchange through the first drain pipe 460. The second heat exchanger 330 is connected to the second drain pipe 490 to discharge the condensed liquid after heat exchange through the second drain pipe 490.

[0081] In one embodiment, please refer to Figure 1 The first liquid discharge pipeline 460 is provided with a second one-way valve 461 , and the second one-way valve 461 is used to prevent substances outside the first liquid discharge pipeline 460 from entering the upper box body 210 .

[0082] like Figure 1 In the illustrated embodiment, in order to prevent gas or liquid outside the first drain pipe 460 from entering the upper box body 210, a second one-way valve 461 is provided on the first drain pipe 460, so that liquid can enter the first drain pipe 460 from the upper box body 210 and be discharged, but gas or liquid outside the first drain pipe 460 cannot enter the upper box body 210, so as to ensure the quality of the prepared pure steam.

[0083] Optionally, the second one-way valve 461 is a check valve.

[0084] In one embodiment, please refer to Figure 1 A second drain valve 462 is also provided on the first liquid discharge pipeline 460.

[0085] The second steam trap 462 is provided to allow water in the upper housing 210 to be discharged through the first drain pipe 460 , but to prevent steam in the upper housing 210 from being discharged from the first drain pipe 460 .

[0086] In one embodiment, please refer to Figure 1 The output end of the first exhaust pipe 450 is connected to the first drain pipe 460, and the first drain pipe 460 is also provided with an exhaust extension pipe 453. During operation, the non-condensable gas in the buffer tank 100 enters the first drain pipe 460 through the first exhaust pipe, and then is discharged through the exhaust extension pipe 453.

[0087] In one embodiment, please refer to Figure 1 The third heat exchanger has a heat exchange tube 221, and the raw water exchanges heat and forms steam in the heat exchange tube 221; the evaporator is also provided with a liquid level detector 230, and the liquid level detector 230 is used to detect the liquid level height of the raw water in the heat exchange tube 221.

[0088] like Figure 1In the illustrated embodiment, a third heat exchanger is provided in the lower box body 220, and the third heat exchanger is used to perform heat exchange between the industrial steam entering the lower box body 220 through the steam inlet pipe 420 and the raw water entering the lower box body 220 through the first connecting pipe 430, so as to evaporate the raw water and condense the industrial steam.

[0089] like Figure 1 In the embodiment shown, a cavity is formed at the bottom of the lower box 220 to temporarily store the raw water entering through the first connecting pipe 430. The lower end of the heat exchange tube 221 of the third heat exchanger is connected to the inner cavity of the cavity. The raw water can rise from the cavity and enter the heat exchange tube 221. The raw water in the heat exchange tube 221 has a certain liquid level. When the industrial steam passes through the outer wall of the heat exchange tube 221, the industrial steam and the raw water exchange heat, so that the raw water evaporates to form steam. The liquid level detector 230 is set to detect the liquid level of the raw water in the heat exchange tube 221 to determine the pressure in the evaporator.

[0090] In one embodiment, please refer to Figure 1 The liquid level detector 230 is a differential pressure liquid level gauge, and both ends of the differential pressure liquid level gauge are connected to the upper box body 210 and the lower box body 220 respectively.

[0091] The pressure in the upper box 210 is mainly the air pressure formed by the steam, while the pressure in the lower box 220 is mainly the hydraulic pressure of the raw water. Since pure steam requires a certain air pressure when in use, the pure steam in the upper box 210 should try to maintain a certain air pressure, and the raw water in the lower box 220 continuously evaporates and enters the upper box 210, so that the pressure in the upper box 210 is greater than the pressure in the lower box 220. Since there is a first connecting pipe 430 between the lower box 220 and the buffer tank 100, according to the communicating vessel principle, the pressure in the lower box 220 is equal to the pressure in the buffer tank 100, and since the pressure in the upper box 210 is greater than the pressure in the lower box 220, that is, the pressure in the upper box 210 is greater than the pressure in the buffer tank 100, part of the steam in the upper box 210 will spontaneously enter the buffer tank 100 along the return steam pipe 440 under the action of the pressure difference, so as to achieve the heating of the raw water in the buffer tank 100.

[0092] Due to the pressure difference between the upper box body 210 and the lower box body 220, the change in the pressure difference can be converted into the liquid level height of the raw water in the heat exchange tube 221. The liquid level height should be roughly maintained in the middle position of the heat exchange tube 221, so that the industrial steam can more reliably exchange heat when passing through the heat exchange tube 221, thereby ensuring the steam generation efficiency and stability.

[0093] In one embodiment, please refer to Figure 1 The liquid inlet pipeline 410 is also provided with a water pump 411 and a flow meter 412.

[0094] When the liquid level detector 230 detects that the liquid level of the raw water in the heat exchange tube 221 exceeds the expected height range, the entry of the raw water is adjusted through the water pump 411 and the flow meter 412 to ensure the pressure balance of the entire steam generation system.

[0095] Optionally, a second regulating valve 413 is further provided on the liquid inlet pipeline 410, and the second regulating valve 413 is used to adjust the inflow amount of raw water.

[0096] Specifically, the water pump 411 is equipped with a frequency converter, the flow meter 412 is a turbine flow meter, and the second regulating valve 413 is a flow pneumatic regulating valve.

[0097] In one embodiment, the steam inlet pipeline 420 is further provided with a third regulating valve 421 to adjust the inlet amount of industrial steam.

[0098] Through the coordinated control of the liquid level detector 230, the third regulating valve 421 and the fourth regulating valve 471, the deviation and fluctuation of the output pressure of pure steam from the set value are ensured to be kept within ±5%, thereby meeting the pure steam consumption requirements under different sterilization conditions.

[0099] In one embodiment, please refer to Figure 1 The steam supply pipeline 470 is also connected to a sampling pipeline 480 , and a sampling condenser 481 is provided on the sampling pipeline 480 .

[0100] like Figure 1 In the illustrated embodiment, during operation, pure steam enters the sampling condenser 481 through the sampling pipeline 480, and the quality of the pure steam is detected by detecting the conductivity of the condensed water after condensation.

[0101] Optionally, the sampling condenser 481 is connected to the first liquid drain line 460 through a pipeline to discharge the condensed pure steam into the first liquid drain line 460 and discharge it.

[0102] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0103] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0104] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0105] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0106] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0107] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0108] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A steam generating system, characterized in that: include: Evaporator; A cache tank; the cache tank comprises a tank body, the tank body having a closed cavity and a first port, a second port and a third port which are all connected to the closed cavity, the first port being used to connect the tank body with a liquid inlet pipeline, the second port being used to connect the tank body with an evaporator through a first connecting pipeline, and the third port being used to connect the tank body with a return steam pipeline, a first nozzle being provided in the cache tank, the first nozzle being connected to the liquid inlet pipeline; a second nozzle and a degassing member being provided in the tank body, the second nozzle being connected to the return steam pipeline, the second nozzle being used to spray pure steam refluxed in the evaporator into the closed cavity, the degassing member being provided between the first nozzle and the second nozzle, the tank body further having a fourth port connected to the closed cavity, the fourth port being used to connect the tank body with a first exhaust steam pipeline for removing non-condensable gas in the raw water sprayed from the first nozzle, and the first exhaust steam pipeline being used to discharge the non-condensable gas; a preheating component, the preheating component is arranged on the liquid inlet pipeline, and the preheating component is used to preheat the raw water entering the buffer tank; the preheating component includes a first heat exchanger, a first heat exchange pipeline and a first valve arranged on the first heat exchange pipeline, the first heat exchanger is arranged on the liquid inlet pipeline, the buffer tank is located between the first heat exchanger and the evaporator, and both ends of the first heat exchange pipeline are respectively connected to the evaporator and the first heat exchanger; The raw water that has not evaporated in the evaporator forms concentrated water, and the concentrated water enters the first heat exchanger through the first heat exchange pipeline to exchange heat with the raw water on the liquid inlet pipeline.

2. The steam generating system according to claim 1, characterized in that: A first one-way valve is provided on the first exhaust steam pipeline, and the first one-way valve is used to prevent substances outside the first exhaust steam pipeline from entering the buffer tank; or / and a first regulating valve is provided on the first exhaust steam pipeline.

3. The steam generating system according to claim 1, characterized in that: The liquid inlet pipeline is also provided with a second regulating valve, and the second regulating valve is used to adjust the inflow amount of raw water.

4. The steam generating system according to claim 1, characterized in that: The evaporator is connected to a steam inlet pipeline, the steam inlet pipeline is used to transport a heat exchange medium, and the heat exchange medium exchanges heat with the raw water in the evaporator and condenses to obtain a condensate; The preheating component includes a second heat exchanger, a second heat exchange pipeline and a first steam trap arranged on the second heat exchange pipeline. The second heat exchanger is arranged on the liquid inlet pipeline. The buffer tank is located between the second heat exchanger and the evaporator. The two ends of the second heat exchanger are respectively connected to the evaporator and the second heat exchanger. The condensate enters the second heat exchanger through the second heat exchange pipeline to exchange heat with the raw water on the liquid inlet pipeline.

5. The steam generating system according to claim 4, characterized in that: The steam inlet pipeline is also provided with a third regulating valve to adjust the inlet amount of industrial steam.

6. The steam generating system according to claim 1, characterized in that: The evaporator comprises an upper box and a lower box connected to the upper box, two ends of the return steam pipeline are connected to the upper box and the buffer tank respectively, and two ends of the first connecting pipeline are connected to the lower box and the buffer tank respectively; A spiral water vapor separator is provided in the upper box body, and a third heat exchanger is provided in the lower box body. The raw water in the tank body enters the lower box body through the first connecting pipe and is heat-exchanged by the third heat exchanger to form steam. The steam enters the upper box body and is separated from the water vapor by the spiral water vapor separator to obtain pure steam.

7. The steam generating system according to claim 6, characterized in that: The spiral water vapor separator separates the steam into pure steam and heavy water, and the upper box is also connected to a first liquid drain pipeline, which is used to discharge the heavy water; A second one-way valve is arranged on the first liquid discharge pipeline, and the second one-way valve is used to prevent substances outside the first liquid discharge pipeline from entering the upper box body; a second steam trap is also arranged on the first liquid discharge pipeline.

8. The steam generating system according to claim 7, characterized in that: The evaporator is connected to a steam supply pipeline, and the steam supply pipeline is used to output pure steam to a steam-using terminal.

9. The steam generating system according to claim 8, characterized in that: The steam supply pipeline is also connected to a sampling pipeline, and a sampling condenser is arranged on the sampling pipeline. The sampling condenser is connected to the first liquid discharge pipeline through a pipeline to discharge the condensed pure steam to the first liquid discharge pipeline and discharge it.

10. The steam generating system according to claim 6, characterized in that: The third heat exchanger has a heat exchange tube, in which the raw water exchanges heat and forms steam; the evaporator is also provided with a liquid level detector, which is used to detect the liquid level height of the raw water in the heat exchange tube; the liquid inlet pipeline is also provided with a water pump and a flow meter.

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