Energy-saving hot water tank

Abstract

The utility model relates to an energy-saving hot water tank which is characterized in that a soft water inlet and an emptying port are arranged at the top of a tank body, a hot water outlet is arranged at the bottom of the tank body, a coil pipe and a steam straight pipe are arranged in the tank body, one end of the coil pipe is connected with a steam inlet at the side part of the tank body, and the tail end of the coil pipe is connected with the steam straight pipe which is positioned in the center of the tank body and has a sealed bottom; the valve hole is a trapezoid side hole composed of a valve face, two valve legs and a steam straight pipe face, steam can be dispersed more evenly, impact vibration is reduced, two sets of thermometers are additionally arranged in the tank and used for monitoring the temperature of the top and the temperature of the bottom, meanwhile, a distributor and a filler section are arranged, soft water is dispersed into small liquid drops through a distribution pipe and a liquid distribution pipe by the distributor, and the small liquid drops are fed into the filler section. A uniform liquid film is formed on the surface of the filler and fully exchanges heat with steam, parameters of the multi-layer spiral coil pipe are optimized, and the fixed valve holes are arranged in a multi-layer staggered mode. And meanwhile, the design of the filler supporting plate and the filler layer can improve the mass and heat transfer efficiency, effectively recover steam energy, reduce energy waste and meet the requirements of energy conservation and emission reduction.

Description

Technical Field

[0001] This utility model belongs to the technical field of steam heating equipment, specifically relating to an energy-saving hot water tank. Background Technology

[0002] In industrial production, hot water tanks, as core equipment for heat exchange, directly impact energy consumption and operating costs due to their thermal efficiency. Traditional hot water tanks generally employ two heating methods: one is an indirect heat exchange mode based on coils, which conducts heat through the pipe walls. While this avoids medium mixing, it suffers from inherent drawbacks such as low heat exchange efficiency and large equipment size. The other is contact heating, where steam is directly introduced into soft water. Although this method offers advantages such as rapid heating and ease of operation, it reveals significant technical shortcomings in practical applications.

[0003] Especially in the PET recycling process, the system requires the use of high-purity soft water as the steam drum makeup medium. Although this type of soft water treated by ion exchange has low scaling characteristics, its preparation cost is as high as 3-5 times that of conventional industrial water. Existing direct heating hot water tanks generally adopt a simple perforated steam pipe structure. After the steam is directly injected into the liquid phase through the small holes in the pipe wall, it rises rapidly. Due to the lack of effective mass and heat transfer enhancement measures, there are three major technical defects: (1) The steam bubble coalescence phenomenon is serious, the contact area between the gas and liquid phases is limited, and about 30%-40% of the steam escapes from the vent before completing the latent heat release, resulting in low steam utilization rate; (2) The disordered convection motion causes a significant temperature gradient, and the axial temperature difference of the tank body often reaches 15-20℃, which affects the uniform distribution of heat energy; (3) The kinetic energy of the steam jet is not effectively converted, causing violent fluctuations in the liquid surface, which aggravates the water mist entrainment phenomenon and causes about 2%-3% soft water loss per hour.

[0004] To address these issues, the industry has attempted various improvements, including increasing the density of steam pipe openings and employing multi-stage distributors, but with limited success. Increasing the opening density reduces steam injection velocity, exacerbating bubble coalescence; while traditional distributors improve initial distribution, they cannot maintain a stable gas-liquid interface. More critically, existing structures lack a tiered heat exchange system, failing to achieve the gradual utilization of steam thermal energy. These technical bottlenecks result in persistently high steam consumption; under continuous production conditions, a single unit can waste over 500 tons of steam annually, causing not only energy waste but also increased use of costly soft water. Therefore, developing energy-efficient hot water tanks with highly efficient heat transfer structures and the ability to achieve gradient steam utilization has become a pressing technical challenge for the industry. Utility Model Content

[0005] In view of this, this utility model proposes an energy-saving hot water tank. The energy-saving hot water tank of this solution addresses the technical pain points of insufficient steam heat exchange and large heat loss due to venting in existing equipment, achieving energy efficiency improvement through a multi-stage heat exchange structure innovation. Its core improvements include: installing a spiral coil inside the tank that also functions as a pre-heat exchanger, allowing steam to enter the coil through a side inlet for initial indirect heat exchange; optimizing the traditional terminal pipeline into a central straight steam pipe extending to the bottom of the tank, with multiple sets of trapezoidal fixed valve holes on the surface of this straight pipe, adjusting the steam flow field distribution through directional injection, and enhancing the uniformity of gas-liquid contact. Specifically, a packing layer structure is integrated into the upper part of the tank, forming a counter-current heat exchange zone with a top liquid distributor, allowing rising steam to undergo secondary contact heat exchange with soft water evenly distributed through the packing, effectively capturing the waste heat of the escaping steam. This composite heat exchange system, through a triple heat exchange mode of indirect-direct-countercurrent, significantly improves the utilization rate of latent heat of steam, simultaneously solving the problem of temperature stratification within the tank, and achieving the goal of energy saving and consumption reduction.

[0006] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0007] An energy-saving hot water tank includes a soft water inlet, a steam inlet, a hot water outlet, a vent, a tank body, a coil, and a steam straight pipe. The soft water inlet and vent are located at the top of the tank body, the hot water outlet is located at the bottom of the tank body, the coil is located inside the tank body, and the steam inlet is located on the side of the tank body and connected to one end of the coil inside the tank body. The end of the coil is connected to the steam straight pipe, and the bottom of the steam straight pipe is sealed at the center of the tank body. Fixed valve holes are arranged in a ring around the steam straight pipe. Preferably, the fixed valve holes are located 100-150mm from the bottom of the tank and 100-200mm above the bottom of the steam straight pipe. A ring of 12 fixed valve holes is arranged around the steam straight pipe, with a hole spacing of 25.88mm.

[0008] Preferably, the tank body has 12 layers of spirally arranged coils inside, with a coil diameter of 1600-1700mm and a coil diameter of 114.3×3.2mm. The spacing between each layer of coils is 150-160mm.

[0009] In a structure that optimizes the aforementioned scheme, thermometer A and thermometer B are also included, with thermometer A located at the top of the tank and thermometer B located at the bottom of the tank.

[0010] In a structure that optimizes the aforementioned scheme, a distributor and a packing section are also included. The distributor is located at the top inside the tank and is connected to the soft water inlet, while the packing section is located below the distributor.

[0011] In a structure that optimizes the aforementioned scheme, the fixed valve orifice is a trapezoidal side hole composed of a valve face, two valve legs, and a steam straight pipe surface. This structure exerts a driving force component on the steam along the pipe wall direction. The steam enters the liquid phase of the hot water tank through this side hole for gas-liquid contact mass transfer, resulting in more uniform gas dispersion and an increased gas-liquid contact area, which is beneficial for improving mass and heat transfer efficiency and reducing heating time. Simultaneously, due to the high temperature and fast flow rate of the steam, if the steam were directly discharged into the liquid phase through a small orifice, it would cause strong impact and vibration. The fixed valve alters the flow direction and speed of the steam, optimizing the flow path within the tank and buffering and dispersing the impact force of the high-speed steam flow, thereby reducing impact and vibration within the hot water tank. Preferably, the valve face and two valve legs, together with the steam straight pipe surface, form two trapezoidal side holes with an upper base of 9mm, a lower base of 18mm, and a height of 5mm, whose projected area on the pipe plane is a rectangular region of 10mm × 20mm.

[0012] In a structure that optimizes the aforementioned solution, the fixed valve holes are arranged in a ring on the steam straight pipe. The ring has several layers, and the fixed valve holes in adjacent layers are staggered to make the steam distribution more uniform. Preferably, the ring has 8 layers, with a spacing of 30mm between each layer.

[0013] In a structure that optimizes the aforementioned solution, stiffeners and a sleeve are also included. The sleeve is fixed on the steam straight pipe, and three evenly distributed stiffeners are set at the bottom of the tank and connected to the sleeve to prevent the steam straight pipe from shifting due to excessive steam impact force.

[0014] In a structure that optimizes the aforementioned solution, the packing section includes a packing layer and a packing support plate. The packing support plate is fixed inside the tank, and the packing layer is disposed on the packing support plate. Preferably, the height of the packing layer is 0.3-0.4m.

[0015] In a structure that optimizes the aforementioned solution, the packing support plate adopts a segmented grid plate with an opening ratio of 30%-40%, which can ensure the stability of the packing and prevent clogging.

[0016] In a structure that optimizes the aforementioned scheme, the packing layer uses M250Y metal plate corrugated packing with a specific surface area of ​​250m². 2 / m 3 The corrugations are inclined at a 45° angle to the tank axis, and the plate height is 80-100 mm, which helps to ensure uniform distribution of steam in the packing layer. Preferably, the porosity of the packing is 90%-95%. The higher porosity provides sufficient fluid channels for steam and soft water, which is beneficial for fluid flow and diffusion in the packing. The open area ratio is 6%-8%, which is conducive to good contact between steam and water on the packing surface, while maintaining sufficient packing density.

[0017] In a structure that optimizes the aforementioned solution, the distributor includes a distribution pipe and a liquid distribution pipe. Several liquid distribution pipes are arranged in parallel, and the distribution pipe is connected to the liquid distribution pipes. Small holes are opened at the bottom of the liquid distribution pipes, and the distribution pipes are connected to the soft water inlet via connecting pipes. Preferably, based on the required soft water inlet volume, the distribution pipe uses a steel pipe with a diameter of 60.3 × 4 mm, and the liquid distribution pipes use steel pipes with a diameter of 42.4 × 3.6 mm. The total number of pipes is 15, symmetrically arranged with a spacing of 130 mm. Small holes with a diameter of 4 mm are opened at the bottom of the liquid distribution pipes with a spacing of 50 mm, and the liquid spray density is 100-120 points / m². 2 .

[0018] In the implementation of the above scheme, room temperature soft water is dispersed into countless tiny droplets through a pipe-type liquid distributor. These droplets form a uniform liquid film on the surface of the packing material, which fully contacts and exchanges heat with the steam that has not been completely heated, thereby improving the mass and heat transfer efficiency. The steam energy that would otherwise escape and be wasted is captured and recovered, reducing energy waste and meeting the requirements of energy conservation and emission reduction.

[0019] Compared with existing technologies, the energy-saving hot water tank of this utility model has significant advantages in terms of heat energy utilization, operational stability, and operation and maintenance through innovative structural design and system optimization.

[0020] 1. A multi-stage composite heat exchange system is adopted, which constructs a heat energy gradient utilization mode through a three-stage heat transfer path of coil pre-heat exchange, steam straight pipe directional injection and packing counter-current contact, which greatly improves the latent heat recovery efficiency of steam and effectively reduces heat energy escape.

[0021] 2. The unique steam straight pipe structure, combined with the fluid dynamics-optimized fixed valve hole design, not only enhances the uniformity of gas-liquid contact, but also buffers the steam impact force, simultaneously solving the problems of temperature stratification and equipment vibration, and ensuring the long-term stable operation of the system.

[0022] 3. The modular packing section and distributor design balances efficient mass transfer and convenient maintenance. Through the synergistic effect of high specific surface area packing and precision liquid distribution system, full contact between steam and soft water is achieved, while simplifying the replacement process of key components.

[0023] 4. The overall structure achieves breakthroughs in heat exchange efficiency, energy utilization rate and operating economy, and is especially suitable for high-cost soft water scenarios, significantly reducing energy consumption and resource waste, and has outstanding industrial application value. Attached Figure Description

[0024] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0025] Figure 1 This is a schematic diagram of the energy-saving hot water tank structure described in this utility model;

[0026] Figure 2 This is a schematic diagram showing the arrangement of the fixed valve holes on the steam straight pipe according to this utility model;

[0027] Figure 3 This is a cross-sectional view of the fixed valve hole in the aa direction of the present invention;

[0028] Figure 4 This is a cross-sectional view of the fixed valve hole in the bb direction of the present invention.

[0029] Figure 5 This is a schematic diagram of the structure of the pipe-type liquid distributor of this utility model;

[0030] Figure 6 This is a schematic diagram of the planar structure of the pipe-type liquid distributor of this utility model;

[0031] Figure 7 This is a partial cross-sectional view of the pipe-type liquid distributor of this utility model in the cc direction;

[0032] Figure 8 This is a comparison chart of the energy-saving effects of different embodiments.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Soft water inlet, 2. Distributor, 3. Packing section, 4. Steam inlet, 5. Hot water outlet, 6. Vent, 7. Thermometer A, 8. Thermometer B, 9. Tank body, 10. Coil, 11. Steam straight pipe, 12. Fixed valve hole, 13. Rib plate, 14. Sleeve, 15. Packing layer, 16. Packing support plate, 17. Distribution pipe, 18. Liquid distribution pipe. Detailed Implementation

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0036] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] like Figure 1 As shown, the energy-saving hot water tank in this embodiment is mainly composed of soft water inlet 1, steam inlet 4, hot water outlet 5, vent 6, tank body 9, coil 10, steam straight pipe 11 and other components.

[0040] Tank and Interfaces: Tank 9 is cylindrical, with a diameter of 2000mm and a height of 3300mm. A soft water inlet 1 is connected to the center of the top of tank 9 for introducing room-temperature soft water. A vent 6 is located on one side of the top for releasing pressure inside the tank when necessary. A hot water outlet 5 is connected to the center of the bottom of tank 9 for discharging heated hot water.

[0041] Coils and Steam Pipes: Inside the tank body 9, there are 12 layers of spirally arranged downwards coils 10. The coils 10 are made of stainless steel tubing with a diameter of 114.3 × 3.2 mm, a coil diameter of 1600-1700 mm, and a spacing of 150-160 mm between each layer. A steam inlet 4 is connected to the side of the tank body 9 and welded to one end of the coils 10. The end of the coils 10 is welded to a steam straight pipe 11, which is sealed at the bottom and located at the center of the tank body 9, with the bottom of the steam straight pipe 100-150 mm from the bottom of the tank. A fixed valve hole 12 is annularly opened 100-200 mm above the bottom of the steam straight pipe 11.

[0042] Fixed valve orifice 12: The fixed valve orifice 12 is a trapezoidal side hole composed of a valve face, two valve legs, and a steam straight pipe surface. The valve face and two valve legs, together with the steam straight pipe surface, form two trapezoidal side holes with an upper base of 9mm, a lower base of 18mm, and a height of 5mm. Its projection on the pipe plane is a rectangular area of ​​10mm × 20mm. The fixed valve orifice 12 is arranged in a ring around the steam straight pipe, with 12 fixed valve orifices in one ring and a hole spacing of 25.88mm. The fixed valve orifice 12 is arranged in 8 layers in the ring, with a spacing of 30mm between each layer, and the fixed valve orifices 12 in adjacent layers are staggered.

[0043] Distributor and Packing Section: A distributor 2 is installed at the top inside the tank 9. The distribution pipe 17 of the distributor 2 is welded to the soft water inlet 1 via a connecting pipe. The distribution pipe 17 is a 60.3mm × 4mm steel pipe, welded to 15 parallel distribution pipes 18. The distribution pipes 18 are 42.4mm × 3.6mm steel pipes, symmetrically arranged with a spacing of 130mm. Small holes of 4mm diameter are opened at the bottom of the distribution pipes with a spacing of 50mm. A packing section 3 is installed below the distributor 2. The packing support plate 16 of the packing section 3 is a segmented grid plate with an opening rate of 30-40%, fixed inside the tank 9 by welding. A packing layer 15 is placed on the packing support plate 16. The packing layer 15 uses M250Y metal plate corrugated packing, with a height of 0.3-0.4m and a specific surface area of ​​250m². 2 / m 3 The corrugated plate has an inclination angle of 45° to the tank shaft, a plate height of 80-100mm, a porosity of 90-95%, and an opening ratio of 6-8%. Three evenly distributed stiffening plates 13 are welded to the bottom of the tank body 9. The stiffening plates 13 are welded to the sleeve 14 fixed on the steam straight pipe 11 to prevent the steam straight pipe from shifting.

[0044] Auxiliary structure: Thermometer A7 is installed at the top of tank 9 and thermometer B8 is installed at the bottom, for real-time monitoring of the temperature at different locations inside the tank.

[0045] The operation process of an energy-saving hot water tank:

[0046] Soft water introduction: Room temperature soft water enters the distribution pipe 17 through the soft water inlet 1. The distribution pipe 17 evenly distributes the soft water to each distribution pipe 18. The small holes at the bottom of the distribution pipe 18 disperse the soft water into countless tiny droplets at a rate of 100-120 drops / m. 2 The liquid spray density falls and forms a uniform liquid film on the surface of the packing layer 15.

[0047] Steam Heating: High-temperature steam enters the coil 10 through steam inlet 4. During its flow within the coil, it undergoes preliminary heat exchange with the water in the tank before entering the steam straight pipe 11. The steam then enters the liquid phase of the tank through the fixed valve orifice 12 on the steam straight pipe 11. Due to the special structure of the fixed valve orifice, the steam flow direction and velocity change, the impact force is buffered and dispersed, and it uniformly contacts the liquid in the tank for mass and heat transfer. The steam that has not fully exchanged heat continues to rise and fully contacts the soft water film on the surface of the packing layer 15 for heat exchange.

[0048] Temperature monitoring and hot water output: The internal temperature of the tank is monitored in real time by thermometer A7 at the top and thermometer B8 at the bottom. When the hot water temperature at the bottom reaches the set temperature, hot water is output through hot water outlet 5. Simultaneously, if the internal pressure is too high, pressure is released through vent 6. Throughout the entire operation, steam energy is fully utilized, improving mass and heat transfer efficiency, reducing energy waste, and achieving energy conservation.

[0049] To better demonstrate the advantages of this utility model, Comparative Example 1 and Examples 1-4 were designed to compare their equipment performance.

[0050] Comparative Example 1

[0051] Comparative Example 1 is an existing hot water tank with a diameter of 2000 mm and a height of 3300 mm. A steam straight pipe extends into the center of the tank, and evenly arranged through holes are provided on the pipe wall inside the tank.

[0052] Example 2

[0053] In this embodiment 2, the upper end of the steam straight pipe 11 is modified into a coil 10 based on the existing hot water tank. The arrangement and spacing of the coil 10 are consistent with the description in the previous embodiment. The straight pipe section is retained at the end and fixed to the bottom of the tank body 9 by the sleeve 14 and the stiffener 13.

[0054] Example 3

[0055] In this embodiment 3, the uniformly arranged through holes on the wall of the steam straight pipe 11 are modified into fixed valve holes 12 based on the existing hot water tank. The size and arrangement of the fixed valve holes 12 are consistent with the description in the previous embodiment.

[0056] Example 4

[0057] This embodiment 4 adds a packing section 3 and a distributor 2 to the existing hot water tank. The specifications and dimensions of the packing section 3 and the model of the distributor 2 are consistent with those described in the previous embodiments.

[0058] For other necessary structures in Comparative Example 1 and Examples 1-4, refer to the description in the foregoing examples.

[0059] The vapor phase temperature at the top of the hot water tank was measured using thermometer A7 at the top of the tank in different embodiments to compare the steam heat capture capabilities of different embodiments. The experimental results are shown in Table 1. Furthermore, the inflow and outflow rates of the hot water tank were controlled at 10.6 m³ / s within the same time period. 3 / h, the opening of the steam feed valve was adjusted by thermometer B8 at the bottom of the hot water tank, and the steam consumption of different embodiments was recorded when the temperature of the hot water tank was stabilized at 65℃ within 3 hours. The experimental results are shown in Table 2, and the experimental results are plotted on the graph. Figure 8 .

[0060] Table 1. Tank Top Vapor Phase Temperature Records for Different Embodiments

[0061]

[0062] Table 2. Steam consumption record table for different embodiments

[0063]

[0064]

[0065] From Table 1 and Figure 8 As can be seen, the vapor phase temperature at the top of the tank in Comparative Example 1 is 82-85℃, while the vapor phase temperatures at the top of the tanks in Examples 2 and 3 are both 77-80℃. The vapor phase temperature in Example 2 is slightly lower than that in Example 3, and the vapor phase temperature at the top of the tank in Example 4 is reduced to 66-69℃. The lower the vapor phase temperature, the more complete the heat exchange between the steam and the soft water, the less heat energy contained in the steam escaping from the top of the tank, and the better the heat collection capacity of the hot water tank. It can be seen that adding a steam coil and opening a fixed valve hole 12 have similar effects on improving the heat exchange efficiency of the hot water tank. However, adding a packing section 3 above the tank body has a better effect than the former two. The steam that has not been fully heat-exchanged in the hot water tank can fully contact and exchange heat with room temperature soft water on the surface of the metal packing, and the heat exchange efficiency is significantly improved. The vapor phase temperature at the top of the tank in Example 1 is 61-64℃, which is the lowest. This shows that on the basis of adding a packing section 3, adding a steam coil and opening a fixed valve hole 12 can further improve the heat exchange efficiency of the hot water tank and greatly enhance the ability to recover steam heat.

[0066] And from Table 2 and Figure 8It is evident that the steam consumption of Examples 1, 2, 3, and 4 is lower than that of Comparative Example 1. By adding a steam coil, opening a fixed valve orifice 12, and adding a packing section 3, the heat exchange efficiency of the hot water tank is significantly improved, and the steam required to heat the same mass flow rate of soft water is significantly reduced. The improved hot water tank effectively captures the steam that escapes in the liquid phase due to incomplete heat exchange, improving steam utilization efficiency and reducing energy costs. The data in Tables 1 and 2 show that Examples 1, 2, 3, and 4 demonstrate significant advantages in improving the heat exchange efficiency of steam and soft water and reducing steam consumption, meeting the requirements of energy conservation and emission reduction.

[0067] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An energy-saving hot water tank, characterized in that: It includes a soft water inlet (1), a steam inlet (4), a hot water outlet (5), a vent (6), a tank body (9), a coil (10), and a steam straight pipe (11). The soft water inlet (1) and the vent (6) are set at the top of the tank body (9). The hot water outlet (5) is set at the bottom of the tank body (9). The coil (10) is set inside the tank body (9). The steam inlet (4) is set on the side of the tank body and connected to one end of the coil (10) inside the tank body (9). The end of the coil (10) is connected to the steam straight pipe (11). The bottom of the steam straight pipe (11) is sealed at the center of the tank body (9). A fixed valve hole (12) is opened in a ring on the steam straight pipe (11).

2. The energy-saving hot water tank according to claim 1, characterized in that: It also includes thermometer A (7) and thermometer B (8), with thermometer A (7) set at the top of the tank (9) and thermometer B (8) set at the bottom of the tank (9).

3. The energy-saving hot water tank according to claim 1, characterized in that: It also includes a distributor (2) and a packing section (3). The distributor (2) is located at the top inside the tank (9) and is connected to the soft water inlet (1). The packing section (3) is located below the distributor (2).

4. The energy-saving hot water tank according to claim 1, characterized in that: The fixed valve hole (12) is a trapezoidal side hole composed of a valve face, two valve legs and a steam straight pipe face.

5. The energy-saving hot water tank according to claim 4, characterized in that: The fixed valve hole (12) is arranged in a ring on the steam straight pipe (11). The fixed valve hole (12) has several layers, and the fixed valve holes (12) of adjacent layers are arranged alternately.

6. The energy-saving hot water tank according to claim 1, characterized in that: It also includes stiffeners (13) and sleeves (14). The sleeves (14) are fixed on the steam straight pipe (11). Three evenly distributed stiffeners (13) are set at the bottom of the tank body (9) and connected to the sleeves (14).

7. The energy-saving hot water tank according to claim 3, characterized in that: The packing section (3) includes a packing layer (15) and a packing support plate (16). The packing support plate (16) is fixed inside the tank body (9), and the packing layer (15) is set on the packing support plate (16).

8. The energy-saving hot water tank according to claim 7, characterized in that: The filler support plate (16) adopts a segmented grid plate with an opening ratio of 30%-40%.

9. The energy-saving hot water tank according to claim 7, characterized in that: The packing layer (15) uses M250Y metal plate corrugated packing with a specific surface area of ​​250m2 / m3 and an inclination angle of 45° between the corrugations and the tank shaft.

10. The energy-saving hot water tank according to claim 3, characterized in that: The distributor (2) includes a distribution pipe (17) and a liquid distribution pipe (18). Several liquid distribution pipes (18) are arranged in parallel. The distribution pipe (17) is connected to several liquid distribution pipes (18). A small hole is opened at the bottom of the liquid distribution pipe. The distribution pipe (17) is connected to the soft water inlet (1) through a connecting pipe.

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