A regenerative electric steam generator and a heat supply system thereof

Abstract

The application discloses a heat accumulating type electric steam generator and a heat supply system thereof. The heat accumulating type electric steam generator comprises a shell, an electric heating pipe group and a control system. The shell comprises a heating part and a heat accumulating part. The heating part is provided with a pipe seat group and a water supply pipe seat. The heat accumulating part is provided with a steam valve, a liquid level meter, a temperature meter and a pressure transmitter. The heat accumulating type electric steam generator integrates the heating part and the heat accumulating part in the shell, so that the heat loss of steam in the heat accumulating process is reduced. Meanwhile, the flash evaporation characteristics of saturated water under high pressure in the pressure reducing process are utilized, the storage amount of the saturated water in the heat accumulating part is increased, more saturated water is stored at night or in the off-peak period, the power consumption of the electric steam generator at day or in the peak period is saved, and the electric steam generator has obvious energy-saving effect.

Description

Technical Field

[0001] This invention relates to the field of electric steam generator technology, and more specifically to a thermal storage electric steam generator and its heating system. Background Technology

[0002] An electric steam generator, also known as an electric boiler, is a miniature boiler that uses electric heating to directly heat water / softened water into hot water or steam. It can automatically replenish water, heat water, and continuously generate low-pressure / medium-pressure steam.

[0003] Heating is now used in many places, such as in northern China where coal-fired boilers are used to heat residents during winter. These boilers not only produce large amounts of exhaust gas, causing smog and environmental pollution, but also, in response to the national call to replace coal-fired boilers with electric boilers, while effectively solving the environmental pollution problem, they are mostly used during the day, such as in important industrial enterprises, hospitals, and hotels, which require a constant supply of steam. Currently, the contradiction between urban power supply and demand is becoming increasingly acute, especially the imbalance between peak and off-peak electricity consumption. This imbalance creates both electricity pressure and increased economic expenditure.

[0004] Traditional electric steam storage devices employ a combination of an electric steam boiler or generator and a steam accumulator to store steam. However, since the electric steam boiler or generator and the steam accumulator are separate devices, they need to be connected by pipes. Furthermore, the steam produced by the electric steam boiler or generator is saturated steam, which often contains a significant amount of moisture. When some of the moisture condenses in the steam accumulator, pumps or other power equipment are needed to transport the condensate back to the electric steam boiler or generator for reheating. This results in less than ideal energy-saving performance. In addition, the steam accumulator requires a large floor space to store a significant amount of steam. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, one of the objectives of this invention is to provide a regenerative electric steam generator to solve the aforementioned traditional problems.

[0006] The second objective of this invention is to provide a heating system using the regenerative electric steam generator.

[0007] One of the objectives of this invention is achieved through the following technical solution: A regenerative electric steam generator includes a housing, an electric heating tube assembly mounted on the housing, and a control system electrically connected to the electric heating tube assembly. The housing includes a lower heating section and an upper regenerative section. The heating section is provided with a tube seat assembly and a water supply tube seat. The electric heating tube assembly is mounted on the tube seat assembly. The water supply tube seat is located on the side of the housing. The regenerative section is provided with a steam valve, a level gauge, a thermometer, and a pressure transmitter. The control system includes the following control steps: S1: At night / during off-peak hours, fill the casing with water to the highest safe level. When the water level reaches L... 最高预设 If the water level is too high, stop filling the tank and start the electric heating element assembly to heat the water / softened water inside the tank; otherwise, continue filling the tank. S2: When the pressure inside the shell reaches P 最高预设 and / or the temperature reaches T 最高预设 When the time is right, stop heating and maintain pressure until daytime / peak electricity demand; if steam is needed, open the steam valve to release pressure and flash steam to generate steam for external output; otherwise, continue to maintain pressure; during the pressure release process, the electric heating element group does not work; S3: When the pressure inside the shell reaches P 最低预设 When the water level reaches the normal level, the electric heating element group is turned on to heat the water / softened water in the shell and continue to generate steam to supply steam to the downstream. When the water level reaches the normal level, the water level control module is activated to maintain the normal water level in the shell. Among them, L 最高预设 Preset maximum safe liquid level; P 最高预设 Preset maximum pressure; T 最高预设 Preset maximum temperature; P 最低预设 : Preset minimum pressure.

[0008] Preferably, the tube socket group includes a plurality of first tube sockets and a plurality of second tube sockets, wherein each first tube socket and each second tube socket are arranged alternately at intervals, each first tube socket forming a first tube socket group, and each second tube socket forming a second tube socket group.

[0009] Preferably, there are two sets of tube seat assemblies, each set located at opposite ends of the heating section.

[0010] Preferably, the outlet of the water supply pipe seat is provided with a baffle plate, and the baffle plate is arranged in an L-shape.

[0011] Preferably, the volume ratio of the heat storage portion to the heating portion is (2-5):1.

[0012] Preferably, the heat storage portion is divided into a first region, a second region, a third region, and a fourth region; the first region is located above the heating portion, the second region is located above the first region, the third region is located above the second region, and the fourth region is located above the third region, wherein the volume of the second region > the volume of the heating portion > the volume of the third region > the volume of the first region.

[0013] Preferably, the volume ratio of the second region to the third region is (4-8):1, and the volume ratio of the second region to the heating part is (2.6-3.2):1.

[0014] Preferably, a steam-water separator is installed at the steam outlet of the shell, and the steam-water separator is an orifice plate distributor.

[0015] Preferably, the steam-water separator includes a separation chamber and a plurality of perforated plates installed in the separation chamber. The two ends of the separation chamber are respectively connected to the steam valve and the housing. The perforated plates are evenly distributed from bottom to top.

[0016] The second objective of this invention is achieved by the following technical solution: A heating system comprising the aforementioned thermal storage electric steam generator.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The regenerative electric steam generator of the present invention integrates the heating part and the heat storage part into the shell by setting up a shell, an electric heating tube group and a control system, so as to reduce the heat loss of steam during the heat storage process. At the same time, it utilizes the flash evaporation characteristics of saturated water under high pressure during the depressurization process to increase the storage capacity of saturated water in the heat storage part, so that it can store more saturated water at night / off-peak hours, thereby saving its electricity consumption during daytime / peak hours, and thus having a significant energy-saving effect.

[0018] 2. Traditional electric steam boilers, because the electric steam boiler or electric steam generator and steam accumulator are separate devices, require heating 20°C water to 152°C saturated steam during normal daytime operation, assuming the boiler's rated pressure is 0.4MPa. However, the regenerative electric steam generator of this invention, during operation, heats the 152°C saturated water in the boiler to 152°C saturated steam even when the liquid level is not at the normal level, producing the same amount of steam. Heating 20°C water to 152°C saturated water is done at night using inexpensive off-peak electricity, which can also significantly reduce peak electricity consumption during the day. Attached Figure Description

[0019] Figure 1This is a schematic diagram of the structure of the regenerative electric steam generator of the present invention; Figure 2 for Figure 1 A side view of the regenerative electric steam generator shown; Figure 3 for Figure 1 A top view of the regenerative electric steam generator shown; Figure 4 for Figure 1 The diagram shows the internal structure of the shell. Figure 5 for Figure 4 The diagram shows the first structural schematic of the steam-water separation device. Figure 6 for Figure 4 The diagram shows the second structure of the steam-water separator. Figure 7 for Figure 4 The diagram shows the third structure of the steam-water separator. Figure 8 for Figure 1 The diagram shows another structural schematic of a regenerative electric steam generator.

[0020] In the diagram: 10. Shell; 11. Heating section; 110. Pipe assembly; 111. Water supply pipe assembly; 112. Drain pipe; 113. Manhole device; 12. Heat storage section; 120. First zone; 121. Second zone; 122. Third zone; 123. Fourth zone; 124. First level gauge; 125. Second level gauge; 126. Third level gauge; 127. Surface drain pipe assembly; 128. Main steam valve; 129. Auxiliary steam valve; 13. Protection box; 14. Steam-water separator; 140. Separation chamber; 141. Orifice plate; 142. Orifice position; 143. Baffle plate; 20. Electric heating tube assembly. Detailed Implementation

[0021] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] In the description of this invention, it should be understood that the terms "first" and "second" 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, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] In the description of this invention, it should be understood that when an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be intermediate elements present. Conversely, when an element is referred to as being "directly" connected to another element, there are no intermediate elements.

[0024] Please see Figures 1-8 The present invention provides a preferred embodiment of a thermal storage electric steam generator for generating steam. It is designed to utilize the low electricity consumption periods at night to store steam in a thermal storage manner, and then reuse the stored steam during the day. Specifically, the thermal storage electric steam generator includes a housing 10, an electric heating tube assembly 20 mounted on the housing 10, and a control system electrically connected to the electric heating tube assembly 20.

[0025] For example Figures 1-4 The housing 10 serves as the heating and heat storage unit for the entire electric steam generator. The housing 10 is generally vertical, such as a long cylindrical shape. In other embodiments, the housing 10 may also be horizontal, depending on user requirements, which will not be elaborated further here. In this embodiment, the housing 10 includes a lower heating section 11 and an upper heat storage section 12. The heating section 11 is equipped with a tube seat assembly 110, and an electric heating tube assembly 20 is installed on the tube seat assembly 110. The heating coil of the electric heating tube assembly 20 is placed inside the housing 10. After being energized, it heats the water / softened water inside the housing 10. The tube seat assembly 110 includes multiple first tube seats and multiple second tube seats, with each first tube seat and each second tube seat arranged alternately. Each first tube seat forms a first tube seat row, and each second tube seat forms a second tube seat row, allowing the electric heating tube assembly 20 inserted into the tube seat assembly 110 to uniformly heat the water / softened water inside the housing 10.

[0026] In other embodiments, such as Figure 2There are two sets of tube socket assemblies 110, each located at opposite ends of the heating section 11 of the housing 10. Similarly, there are two sets of electric heating tube assemblies 20, also located at opposite ends of the heating section 11 of the housing 10. The number of electric heating tube assemblies 20 can be activated according to the heating power requirements. To improve safety, the housing 10 is also equipped with a protective box 13 with ventilation holes. The protective box 13 covers the electric heating tube assembly 20, preventing unauthorized contact and reducing the impact of external environmental factors such as moisture, dust, and insects on the operation of the electric heating tubes.

[0027] like Figure 2 and Figure 3 The heating section 11 is also equipped with a water supply pipe seat 111, a drain pipe 112, and a manhole device 113. The water supply pipe seat 111 is located on the side of the housing 10, directly opposite the surface of the heating coil of the electric heating tube assembly 20, for filling the housing 10 with water. To prevent water pressure from impacting the heating coil, the outlet of the water supply pipe seat 111 is equipped with a baffle plate (not shown in the figure). The baffle plate is roughly L-shaped, allowing water to flow in from the side wall of the housing 10. The drain pipe 112 is located at the bottom of the heating section 11 for draining wastewater from the housing 10. The manhole device 113 is opposite to the water supply pipe seat 111, for inspecting the interior of the housing 10 during maintenance or malfunction. In this embodiment, the water supply pipe seat 111 is located between the first pipe seat assembly and the second pipe seat assembly in the bottom row.

[0028] like Figure 4 The heat storage section 12 is used for heat storage and flash evaporation of hot water / steam. The volume ratio of the heat storage section 12 to the heating section 11 is (2-5):1, allowing the shell 10 to have a large heat storage space within the design pressure and design temperature range. For example, the inner diameter of the heat storage section 12 is equal to the inner diameter of the heating section 11, and the ratio of the height of the heat storage section 12 to the height of the heating section 11 is (2-5):1. In other embodiments, the inner diameter of the heat storage section 12 is greater than or less than the inner diameter of the heating section 11, and the height of the heat storage section 12 is adjusted accordingly to conform to the relevant volume ratio. Preferably, the volume ratio of the heat storage section 12 to the heating section 11 is (2.5-3.5):1.

[0029] In this embodiment, for example... Figure 4The heat storage section 12 is divided into a first region 120, a second region 121, a third region 122, and a fourth region 123. The first region 120 is located above the heating section 11 and is the normal liquid level region, i.e., the water level submerges the heating coil on the heating section 11. The second region 121 is located above the first region 120 and is used for the evaporation of high-temperature and high-pressure water in the heat storage section 12 without water replenishment, so as to ensure sufficient evaporation space. The third region 122 is located above the second region 121 and is used for the highest position for water replenishment at night, and also provides appropriate flash evaporation space when used during the day. The fourth region 123 is located above the third region 122 and is the end cap of the shell 10, used to reserve the vaporization separation height of water / softened water. In one embodiment, in order to make full use of the low electricity consumption at night and in consideration of overall cost, the volume of the second region 121 > the volume of the heating part 11 > the volume of the third region 122 > the volume of the first region 120, wherein the volume ratio of the second region 121 to the third region 122 is (4-8):1, and the volume ratio of the second region 121 to the heating part 11 is (2.6-3.2):1.

[0030] In one embodiment, such as Figure 8 The heat storage section 12 is equipped with a first level gauge 124, a second level gauge 125, a third level gauge 126, a surface drain pipe seat 127, a steam valve, and a safety valve. The two ends of the first level gauge 124 are respectively positioned in the middle of the first region 120 and the second region 121 of the heat storage section 12, and are used to measure the normal liquid level of the housing 10 to ensure the liquid level during normal operation. The two ends of the second level gauge 125 are positioned in the second region 121 of the heat storage section 12, and are used to measure the liquid level in the second region 121. The two ends of the third level gauge 126 are positioned in the middle of the second region 121 and the third region 122 of the heat storage section 12. The top of the housing 10 is used to measure the highest safe liquid level of the housing 10. A surface drain pipe seat 127 is located in the first region 120 of the heat storage section 12, i.e., close to the heating section 11, and is used to discharge wastewater from the normal liquid level surface after the equipment is depressurized. The surface drain pipe seat 127 includes a low-level drain pipe port and a high-level drain pipe port to facilitate the drainage of wastewater in the first region 120. The steam valve includes a main steam valve 128 and a secondary steam valve 129. The main steam valve 128, the safety valve, and the secondary steam valve 129 are all located at the top of the housing 10. The main steam valve 128 and the secondary steam valve are used to output steam, and the safety valve is an overpressure relief device for the housing 10. The heat storage section 12 is also equipped with a thermometer and a pressure transmitter. The thermometer is used to measure the water / steam temperature inside the housing 10, and the pressure transmitter is used to measure the steam pressure inside the housing 10. The thermometer and pressure transmitter (shown in the figure) are installed in the third area 122 of the heat storage section 12. Alternatively, the thermometer and pressure transmitter can be arranged in other positions of the housing 10 as needed.

[0031] The working principle of this regenerative electric steam generator is as follows: Normal use: During the day / off-peak hours, water is injected into the housing 10 through the water supply pipe seat 111 to the normal water level, i.e., the first area 120 of the heat storage section 12. Then, it is heated to the required temperature to generate steam, which is output from the main steam valve 128 and / or the auxiliary steam valve at the top of the housing 10. During this period, water needs to be continuously injected into the housing 10 to maintain the normal liquid level of the housing 10. Heat storage and usage: At night / off-peak electricity hours, water is injected into the shell 10 to the highest safe level, i.e., the top of the third zone 122 of the heat storage section 12. Then, the water / softened water in the shell 10 is heated using the low-cost electricity at night / off-peak hours, so that the water in the tank becomes high-temperature and high-pressure saturated water (in this embodiment, heated to about 1.15MPa, 189℃-192℃). Heating is stopped, and the pressure is maintained until daytime / peak electricity hours when steam is needed. The main steam valve 128 and / or auxiliary steam valve at the top of the shell 10 are opened to depressurize to about 0.4MPa. During the depressurization process, the electric heating tube group 20 does not work, so that the high-temperature and high-pressure saturated water undergoes depressurization and flash evaporation in the second zone 121, third zone 122, and fourth zone 123 of the heat storage section 12 to generate steam, which is then output. Thus, the equipment stores steam in a heat storage manner during the nighttime off-peak electricity hours, and reuses the stored steam during the day.

[0032] For example Figures 4-8 A steam-water separator 14 is installed at the steam outlet of the casing 10 to separate the moisture carried in the saturated steam. This steam-water separator 14 is a perforated plate 141 distributor. Specifically, the steam-water separator 14 includes a separation chamber 140 and multiple perforated plates 141 installed within the separation chamber 140. The two ends of the separation chamber 140 are connected to a steam valve and the casing 10, respectively. The perforated plates 141 are evenly distributed from bottom to top. Figure 5 The perforated plate 141 has multiple holes 142 for steam to flow out. These holes 142 are evenly distributed, meaning the holes 142 on the upper and lower perforated plates 141 correspond one-to-one, forming a steam channel. When water collides with the perforated plate 141 or passes through the holes 142, it undergoes steam-water separation, and the water droplets flow back into the housing 10. In another embodiment, such as... Figure 6 The orifice positions 142 are staggered, meaning the orifice positions 142 of the upper orifice plate 141 and the lower orifice plate 141 are staggered to increase the number of collisions between steam and the orifice plate 141, thereby improving the steam-water separation effect. Similarly, as... Figure 7 The holes 142 are evenly distributed, and the upper end of the holes 142 is provided with a baffle plate 143, which can also improve the steam-water separation effect.

[0033] The control system monitors and controls the entire equipment, adjusting it to peak and off-peak electricity demand. It utilizes the off-peak hours at night to store steam as heat, reusing the stored steam during the day. The control system stores the following control steps: S1: At night / off-peak electricity hours, fill the casing 10 with water to the highest safe level (i.e., third zone 122). When the level reaches L... 最高预设 When water injection is interrupted, the electric heating element group 20 is activated to heat the water / softened water in the housing 10; otherwise, water injection continues. When an emergency steam requirement is encountered during water injection, water injection is stopped, the water level is lowered to the normal level, and the heating mode for normal use is activated to generate steam. Similarly, during the following pressure holding process, steam can be activated to supply steam to the user in case of an emergency. S2: When the pressure inside the casing 10 reaches P 最高预设 and / or the temperature reaches T 最高预设 When the pressure is high, heating is stopped and the pressure is maintained until daytime / peak electricity demand. If steam is needed, the steam valve (i.e., the main steam valve 128 and / or the auxiliary steam valve at the top of the shell 10) is opened to release pressure and flash steam to generate steam for external output. Otherwise, the pressure is maintained. During the pressure release process, the electric heating tube assembly 20 does not work. Understandably, in this step, the high-temperature and high-pressure saturated water stored in the heat storage section 12 is utilized. Taking advantage of the flash evaporation characteristics of saturated water under high pressure during the depressurization process, flash evaporation occurs during the depressurization process to generate steam, which is then output to the outside. The high-temperature and high-pressure saturated water can increase the amount of steam stored.

[0034] S3: When the pressure inside the casing 10 reaches P 最低预设 When the electric heating element group 20 is turned on, it heats the water / softened water in the shell 10 to continue generating steam and supplying steam to the downstream. That is, under the minimum preset pressure of the shell 10, the saturated water in the tank can no longer generate enough steam, so the electric heating element group 20 continues to heat it to supply steam normally. This is during the day / peak electricity consumption period.

[0035] When the liquid level reaches the normal level (i.e., the first zone 120), the water level control module (i.e., the control valve on the water supply pipe seat 111, the water level control module is a control block of the control system) is activated to maintain the normal liquid level in the shell 10. When the liquid level is normal, the lower surface drain (i.e., the low-level drain port of the surface drain pipe seat 127) can be opened. When the furnace is shut down, if the liquid level is higher than the normal level, the upper surface drain (i.e., the high-level drain port of the surface drain pipe seat 127) can be opened. L 最高预设 Preset maximum safe liquid level; P 最高预设 Preset maximum pressure: 1.15±0.05 MPa; T最高预设 Preset maximum temperature: 190±3℃; P 最低预设 Preset minimum pressure: 0.4±0.05 MPa.

[0036] In another embodiment, the present invention also provides a heating system including the thermal storage electric steam generator of the above embodiment, which supplies steam to users to match the peak and off-peak electricity consumption. During the night when electricity consumption is low, the steam is stored in a thermal storage manner and then reused during the day.

[0037] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0038] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A regenerative electric steam generator, characterized in that, The system includes a housing, an electric heating element assembly mounted on the housing, and a control system electrically connected to the electric heating element assembly. The housing includes a lower heating section and an upper heat storage section. The heating section is equipped with a pipe seat assembly and a water supply pipe seat. The electric heating element assembly is mounted on the pipe seat assembly. The water supply pipe seat is located on the side of the housing. The heat storage section is equipped with a steam valve, a level gauge, a thermometer, and a pressure transmitter. The control system includes the following control steps: S1: At night / during off-peak hours, fill the casing with water to the highest safe level. When the water level reaches L... 最高预设 If the water level is too high, stop filling the tank and start the electric heating element assembly to heat the water / softened water inside the tank; otherwise, continue filling the tank. S2: When the pressure inside the shell reaches P 最高预设 and / or the temperature reaches T 最高预设 When the time is right, stop heating and maintain pressure until daytime / peak electricity demand; if steam is needed, open the steam valve to release pressure and flash steam to generate steam for external output; otherwise, continue to maintain pressure; during the pressure release process, the electric heating element group does not work; S3: When the pressure inside the shell reaches P 最低预设 When the water level reaches the normal level, the electric heating element group is turned on to heat the water / softened water in the shell and continue to generate steam to supply steam to the downstream. When the water level reaches the normal level, the water level control module is activated to maintain the normal water level in the shell. Among them, L 最高预设 Preset maximum safe liquid level; P 最高预设 Preset maximum pressure, P 最高预设 =1.15±0.05 MPa; T 最高预设 Preset maximum temperature, T 最高预设 =190±3℃; P 最低预设 Preset minimum pressure, P 最低预设 =0.4±0.05 MPa; The volume ratio of the heat storage section to the heating section is (2-5):1; the heat storage section is divided into a first region, a second region, a third region, and a fourth region; the first region is located above the heating section, the second region is located above the first region, the third region is located above the second region, and the fourth region is located above the third region, wherein the volume of the second region > the volume of the heating section > the volume of the third region > the volume of the first region; the volume ratio of the second region to the third region is (4-8):1, and the volume ratio of the second region to the heating section is (2.6-3.2):1; the first region is the normal liquid level, and the top of the third region is the highest safe liquid level; the level gauge is divided into a first level gauge, a second level gauge, and a third level gauge, with the two ends of the first level gauge placed in the middle of the first region and the second region, the two ends of the second level gauge placed in the second region, and the two ends of the third level gauge placed in the middle of the second region and the top of the third region; A steam-water separator, which is an orifice plate distributor, is installed at the steam outlet of the shell.

2. The regenerative electric steam generator according to claim 1, characterized in that, The tube socket group includes a plurality of first tube sockets and a plurality of second tube sockets. Each first tube socket and each second tube socket are arranged alternately at intervals. Each first tube socket forms a first tube socket group, and each second tube socket forms a second tube socket group.

3. The regenerative electric steam generator according to claim 2, characterized in that, There are two sets of tube seat assemblies, each located at opposite ends of the heating section.

4. The regenerative electric steam generator according to claim 1, characterized in that, The outlet of the water supply pipe seat is equipped with a baffle plate, which is arranged in an L-shape.

5. The regenerative electric steam generator according to claim 1, characterized in that, The steam-water separator includes a separation chamber and multiple perforated plates installed in the separation chamber. The two ends of the separation chamber are respectively connected to the steam valve and the housing. The perforated plates are evenly distributed from bottom to top.

6. A heating system, characterized in that, Including the regenerative electric steam generator as described in any one of claims 1-5.

Images