Steam generating apparatus for producing high purity steam

Abstract

The application relates to the field of boilers and steam generation technology, and more particularly to a steam generation device for generating high-purity steam, which comprises a steam chamber and a water storage chamber arranged in a vertical mode, a plurality of sleeve pipe structures circumferentially arranged between the steam chamber and the water storage chamber, an inner pipe and an outer pipe sleeved outside the inner pipe, a first channel formed between the inner pipe and the outer pipe for water to flow through and be vaporized into steam, a second channel formed in the inner pipe for a flame and flue gas to pass through, a combustion chamber arranged above the steam chamber for generating the flame and the flue gas, and a flue gas chamber arranged below the water storage chamber, wherein the upper end of the first channel is communicated with the steam chamber, the lower end of the first channel is communicated with the water storage chamber, the upper end of the second channel is communicated with the combustion chamber, and the lower end of the second channel is communicated with the flue gas chamber. The application changes the injection direction of the flame, so that the temperature of the finally generated steam is higher, and the content of residual liquid water in the steam is effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of boiler and steam generation technology, and more specifically, to a steam generation device capable of producing high-purity steam. Background Technology

[0002] Under the general trend of energy conservation and emission reduction in my country, traditional boilers are gradually developing towards high-efficiency, low-emission steam generating equipment. Once-through steam generators, due to their small water volume and fast steam generation speed, are widely used in industrial and civil fields.

[0003] A once-through steam generator mainly consists of a furnace body, which contains multiple flue pipes and a water inlet. The high-temperature flue gas generated by fuel combustion enters the chimney through the flue pipes. The steam generated by heating the water in the furnace body is discharged from the steam outlet at the top of the furnace body and then enters the external steam pipe.

[0004] Currently, the following defects are common in once-through steam generators on the market: 1. The geometric water volume exceeds the 30 liters specified in the "Boiler Regulations", making it difficult to achieve safety exemption from inspection; 2. The heat exchange efficiency is low, and the heat of the flue gas is not fully utilized, resulting in energy waste.

[0005] Chinese utility model patent application CN116202070A discloses a vertical two-pass steam generator and its boiler heat exchanger. This design uses a sleeve structure (comprising an outer tube and an inner tube) to reduce the water volume of a single tube, meeting safety exemption requirements. However, in this design, the burner nozzle is installed on the lower side of the outer casing, meaning the flame is injected from bottom to top. This causes the temperature inside the sleeve to gradually decrease from bottom to top, ultimately resulting in impure steam discharged from the steam outlet (insufficient steam temperature, containing a large amount of liquid water droplets). Utility Model Content

[0006] The main objective of this invention is to provide a steam generator capable of producing high-purity steam. By changing the direction of the flame injection, the temperature of the final steam is increased, and the content of residual liquid water in the steam is effectively reduced. In addition, the heat exchange efficiency is also significantly improved.

[0007] To solve the above-mentioned technical problems, this utility model proposes a steam generating device for producing high-purity steam, comprising: A steam chamber and a water storage chamber are arranged vertically. Several sleeve structures are circumferentially distributed between the steam chamber and the water storage chamber; each includes an inner tube and an outer tube sleeved outside the inner tube; a first channel is formed between the inner tube and the outer tube for water to flow and vaporize into steam; a second channel is formed inside the inner tube for flames and flue gas to pass through; The combustion chamber, located above the steam chamber, is used to generate flames and flue gas; And the flue gas chamber, located below the water storage chamber; The upper end of the first channel is connected to the steam chamber, and the lower end is connected to the water storage chamber; the upper end of the second channel is connected to the combustion chamber, and the lower end is connected to the flue gas chamber.

[0008] Furthermore, the above technical solution also includes: A preheating chamber is located below the flue gas chamber. The preheating chamber contains a preheating water chamber and a preheater installed inside the preheating water chamber. The inlet of the water storage chamber is connected to the outlet of the preheating chamber via a pipe, and the outlet of the flue gas chamber is connected to the inlet of the preheater via a pipe.

[0009] In any of the above technical solutions, the preheater is further described as a coil-type structure.

[0010] In any of the above technical solutions, further comprising: A heat-absorbing section is disposed within the first channel; the heat-absorbing section includes several heat-absorbing plates in a ring structure, with adjacent heat-absorbing plates stacked along the axial direction; The heat absorber has a radially outward extending baffle ring at its bottom, and a vertical through slot is provided on the baffle ring; the slots on the baffle rings of adjacent heat absorbers are staggered.

[0011] In any of the above technical solutions, the heat-absorbing part further includes a fixing rod, which passes through each heat-absorbing sheet in sequence and limits each heat-absorbing sheet in the radial direction.

[0012] In any of the above technical solutions, further, a number of notches are provided on the side wall of the heat absorber, and the notches are distributed along the circumference of the heat absorber.

[0013] Beneficial effects: Compared with existing technologies, By changing the direction of the flame jet, the temperature of the final steam is increased, and the content of residual liquid water in the steam is effectively reduced.

[0014] By setting up a preheating chamber, the heat exchange efficiency of the flue gas is improved, so that the high-temperature flue gas is heated and then discharged at a low temperature.

[0015] By setting a heat-absorbing part in the first channel, the water volume in the first channel can be reduced, so that the water volume of a single sleeve structure meets the requirements of the "Boiler Code", and safety inspection exemption can be achieved.

[0016] By staggering the slots on the baffle rings of adjacent heat absorbers, the flow path of the water is increased and the flow velocity of the water is reduced, thereby enabling the water to be vaporized quickly.

[0017] By creating a gap, water can directly contact the outer wall of the inner pipe, allowing the water to be vaporized into steam by the higher temperature of the outer wall. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the sleeve structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of part of the sleeve of this utility model; Figure 3 This is a bottom view schematic diagram of the sleeve structure of this utility model; Figure 4 This is a partial structural schematic diagram of the spoiler of this utility model; Figure 5 This is a schematic diagram of the structure of a single spiral spoiler of this utility model; Figure 6 This is a schematic diagram of the flow of flue gas on the spiral baffle plate of this utility model; Figure 7 This is a schematic diagram of the heat-absorbing part of this utility model; Figure 8 This is a schematic diagram of the steam generating device of this utility model.

[0020] The annotations in the attached figures are explained as follows: 10. Sleeve structure; 1. Inner tube; 2. Outer tube; 3. First channel; 4. Second channel; 5. Baffle; 51. Spiral baffle; 511. First baffle a; 512. First baffle b; 513. Second baffle a; 514. Second baffle b; 515. Guide groove; 52. Diverter plate; 6. Heat absorption section; 61. Heat absorption plate; 611. Notch; 62. Baffle ring; 621. Groove; 63. Guide rod; 7. Steam chamber; 8. Water storage chamber; 9. Preheating chamber. Detailed Implementation

[0021] Hereinafter, exemplary embodiments according to this application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely a part of the embodiments of this application, and not all of the embodiments of this application. It should be understood that this application is not limited to the exemplary embodiments described herein. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0022] It should be noted that, as shown in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" do not specifically refer to the singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, and these steps and elements do not constitute an exclusive list; the method or apparatus may also include other steps or elements.

[0023] If the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0024] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0026] The following embodiments will be used to describe in detail a steam generating apparatus of this application.

[0027] Example 1:

[0028] As shown in Figures 1-7, this embodiment proposes a sleeve structure, including: an inner tube 1 and an outer tube 2 sleeved outside the inner tube 1; a first channel 3 is formed between the inner tube 1 and the outer tube 2 for water to flow and vaporize into steam; a second channel 4 is formed inside the inner tube 1 for flames and smoke to pass through; wherein, it also includes: The baffle 5 is installed in the second channel 4 to prolong the residence time of the flame and smoke in the second channel 4.

[0029] Both the inner tube 1 and the outer tube 2 are made of high-temperature resistant metal and are arranged coaxially to ensure that a first annular channel 3 is formed between the inner tube 1 and the outer tube 2 for water circulation and vaporization. A second cylindrical channel 4 is formed inside the inner tube 1 for the passage of flames and smoke.

[0030] The baffle 5 is made of a high-temperature resistant metal material that is compatible with the inner tube 1. It is spirally distributed inside the inner tube 1, which divides the second channel 4 into two spiral channels extending along the axis of the inner tube 1, allowing the flame and smoke to flow in the spiral channels, thereby prolonging the residence time of the smoke.

[0031] The baffle 5 includes several coaxially connected spiral baffles 51 and flow dividers 52 located at both ends, with an overall length close to that of the inner tube 1. The two flow dividers 52 respectively divide the upper and lower ports of the second channel 4 into four equally sized openings, so that the flame and smoke can enter and exit the two spiral channels evenly, thereby heating the water in the first channel 3 and causing the water to be rapidly vaporized and discharged.

[0032] It should be noted that the spiral baffle 51 is attached to the inner wall of the inner tube 1 and fixed along the axis of the inner tube 1 by welding, dividing the second channel 4 into two symmetrical spiral channels to ensure that the flame and flue gas can flow along the spiral path.

[0033] It should be noted that the flame generated in the combustion chamber enters the second channel 4, and after passing through a certain path, the flame disappears and is replaced by flue gas. The flue gas continues to flow downward along the second channel and heats the water and steam in the first channel.

[0034] Example 2:

[0035] This embodiment is a further improvement based on Embodiment 1.

[0036] As shown in Figures 4 and 5, in this embodiment, the spiral spoiler 51 is provided with at least two sets of first baffles and a second set of baffles disposed between adjacent first baffles at intervals along its spiral direction. The first set of baffles and the second set of baffles are located in two spiral channels, respectively.

[0037] A first set of baffles and a second set of baffles are sequentially arranged at fixed intervals on the spiral baffle 51. The first and second sets of baffles are arranged alternately. Specifically, on the spiral trajectory, after one set of first baffles, a second set of baffles is placed at a fixed interval, and then another set of first baffles is placed at the same interval, and so on. The extension direction of the first and second sets of baffles is consistent with the spiral trajectory. The height is determined by not blocking the spiral channel and effectively blocking the flame and smoke. This avoids a sudden increase in the flow resistance of the flame and smoke due to the baffles being too high, and also prevents the blocking effect from failing due to the baffles being too low.

[0038] With a single-sided design corresponding to a single channel, the first set of baffles and the second set of baffles act on the flame and smoke in the two spiral channels respectively, so as to achieve synchronous control of the flow of flame and smoke in the two channels.

[0039] In this embodiment, the optimized first set of baffles includes: a first baffle a511 and a first baffle b512, the first baffle a511 and the first baffle b512 are respectively located on both sides of the spiral baffle 51, and the first baffle a511 and the first baffle b512 are arranged vertically at intervals. The second set of baffles includes: a second baffle a513 and a second baffle b514. The second baffle a513 and the second baffle b514 are located on both sides of the spiral baffle 51, and the second baffle a513 and the second baffle b514 are arranged vertically at intervals. The first baffle a511 and the second baffle a513 are on the same side, and the first baffle b512 and the second baffle b514 are on the same side.

[0040] After the flame is evenly divided into two spiral channels by the diverter 52, the two flames flow in the two spiral channels respectively. For example, the first flame enters the first spiral channel and the second flame enters the second spiral channel. Subsequently, part of the first flame is blocked by the first baffle a511 in the first spiral channel, and then blocked by the first baffle b512, so that the first flame stays in the first spiral channel for a long time, thereby fully absorbing the heat of the flame.

[0041] Example 3:

[0042] This embodiment is a further improvement based on Embodiment 2.

[0043] As shown in Figure 5, in this embodiment, the spiral spoiler 51 is provided with a guide groove 515, which is used to connect the two spiral channels to each other.

[0044] Each of the first baffle a511, the first baffle b512, the second baffle a513, and the second baffle b514 has a corresponding flow guide groove 515 below it; Among them, the upper end surfaces of the first baffle a511, the first baffle b512, the second baffle a513, and the second baffle b514 form a turbulence surface, and the lower end surfaces form a flow guide surface.

[0045] It should be noted that if only spiral channels and baffles are installed without the guide channel 515, the two spiral channels will become independent closed channels, which may lead to the following problems: flame or flue gas stagnation in one channel due to increased local resistance, and excessive flow velocity in the other channel due to excessive flow rate. The presence of the guide channel 515 creates an interconnected structure between the two spiral channels; when the flame or flue gas pressure in one channel is too high, some flame or flue gas can enter the other channel through the guide channel 515; when the flame or flue gas flow rate in one channel is too low, the flue gas in the other channel can be replenished through the guide channel 515, achieving a dynamic balance between flue gas pressure and flow rate in both channels and avoiding local stagnation or abnormal flow velocity.

[0046] Specifically, as shown in Figure 6 (white arrows indicate the normal flow path of flame and smoke; green arrows indicate incoming flame and smoke; red arrows indicate outgoing flame and smoke; and blue arrows indicate blocked flame and smoke), when the flame and smoke flow upward in the first spiral channel, they will directly collide with the upper surfaces of the first baffle a511 and the first baffle b512. During this process, the upper surfaces will physically block the flame and smoke, forcing the flame and smoke flow rate to decrease and preventing the flame and smoke from passing through the channel quickly. At the same time, some flame and smoke will generate a "vortex effect" due to the obstruction, further prolonging the residence time in the local area and improving the heat transfer efficiency. At the same time, some of the flame and flue gas in the second spiral channel will enter the first spiral channel through the corresponding guide groove 515, so that the flame and flue gas can enter the other spiral channel in an orderly manner from one spiral channel through the guide groove 515, realizing the mutual communication of flame and flue gas in the two channels. This method breaks the flow inertia of flame and flue gas, avoids the flame and flue gas from forming a stable flow velocity due to adapting to the obstruction in a single direction, and continuously prolongs the flow time of flame and flue gas in the channel.

[0047] The above scheme significantly extends the flow path of the flame and flue gas within the spiral channel. The gas not only flows along the spiral trajectory but also flows across the channel under the action of the baffle and the guide groove 515, further increasing the contact area and contact time with the inner tube 1 wall.

[0048] In this embodiment, the optimized spiral spoiler 51 is provided with a number of press-formed structures that are the same as the number of first baffles a511, first baffles b512, second baffles a513 and second baffles b514. The openings of each press-formed structure form each guide groove 515, and the flanges of each press-formed structure form each first baffle a511, first baffle b512, second baffle a513 and second baffle b514.

[0049] The flow guide groove 515 on the spiral spoiler 51, along with the first baffle a511, the first baffle b512, the second baffle a513, and the second baffle b514, are integrally formed through a single pressing process, rather than the separate processing method of first welding the baffles and then creating the flow guide groove 515. Specifically, a special pressing mold is used to press the flat metal sheet. During the stamping process, the protruding part of the die presses a local area of ​​the metal sheet downwards, forming an upward-opening groove-shaped structure, which is the guide channel 515. Simultaneously, the edge flanging generated during die pressing naturally forms upward and downward protruding sheet-like structures (through double-sided pressing, the first baffle a511 and the first baffle b512 are on the same side in the thickness direction; the second baffle a513 and the second baffle b514 are on the same side in the thickness direction; the first baffle a511 and the second baffle a513 are on the same side in the width direction; and the first baffle b512 and the second baffle b514 are on the same side in the width direction). This one-piece molding process makes the guide channel 515, the first baffle, and the second baffle an inseparable part of the spiral baffle 51, effectively improving the overall strength of the baffle 5.

[0050] In this embodiment, it should be noted that the included angles between the first baffle a511, the first baffle b512, the second baffle a513 and the second baffle b514 and the corresponding guide groove 515 are acute angles.

[0051] Example 4:

[0052] This embodiment is a further improvement based on any of the above embodiments.

[0053] As shown in Figures 3 and 7, this embodiment also includes: At least one set of heat-absorbing parts 6 are disposed in the first channel 3; the heat-absorbing part 6 includes a plurality of heat-absorbing plates 61, and adjacent heat-absorbing plates 61 are stacked and arranged along the axial direction. The heat absorber 61 has a ring-shaped structure, and a baffle ring 62 extending radially outward is provided at its bottom. The baffle ring 62 has a slot 621 that runs through it in the vertical direction. The slots 621 on the baffle rings 62 of adjacent heat absorbers 61 are staggered.

[0054] The heat-absorbing part 6 serves as a structure for enhancing water heat exchange within the first channel 3 (the annular space between the inner tube 1 and the outer tube 2). Two sets can be installed, located at the upper and lower ends of the sleeve structure, respectively. In addition, the heat-absorbing part 6 can occupy the volume within the first channel 3, thereby reducing the water volume of the sleeve structure and ensuring that the water volume of a single sleeve structure meets the requirements of the "Boiler Regulations", thus achieving safety exemption from inspection.

[0055] It should be noted that by staggering the slots 621 on the baffle rings 62 of adjacent heat absorbers 61, the straight flow of water is blocked, forcing the water to flow around.

[0056] When the water flows upward along the first channel 3, it will be directly blocked by the baffle ring 62, preventing the water from continuing to rise along the original straight path. Instead, the water can only flow towards the slot 621 on the baffle ring 62, thus extending the water flow path and allowing the water to fully absorb heat.

[0057] In this embodiment, the optimized heat-absorbing part 6 further includes a guide rod 63, which passes through each heat-absorbing sheet 61 in sequence, limits each heat-absorbing sheet 61 in the radial direction, and guides the heat-absorbing sheet 61 to move in the axial direction.

[0058] The guide rod 63 limits the heat absorber 61 in the radial direction, preventing the heat absorber 61 from rotating under the impact of the water, which would cause the position of the slot 621 on each heat absorber 61 to change, thereby affecting the flow path of the water.

[0059] In this embodiment, optimizedly, a plurality of notches 611 are provided on the sidewall of the heat absorber 61, and the notches 611 are distributed along the circumference of the heat absorber 61. By providing notches 611 on the heat absorber 61, water can directly contact the outer wall of the inner tube through the notches 611, thereby allowing the water to be directly vaporized into steam by the higher temperature of the outer wall of the inner tube.

[0060] It should be noted that the notch 611 has a V-shaped structure, that is, the notches 611 are combined to form a wave shape, so as to increase the heat exchange area between the water and the outer wall of the inner tube.

[0061] Example 5:

[0062] This embodiment presents a steam generating device.

[0063] As shown in Figures 1-8, this embodiment includes: the sleeve structure 10 of any of the above embodiments; and also includes: A steam chamber 7 and a water storage chamber 8 are arranged vertically. Several sleeve structures are circumferentially distributed between the steam chamber 7 and the water storage chamber 8; each includes an inner tube and an outer tube sleeved on the outside of the inner tube; a first channel is formed between the inner tube and the outer tube for water to flow and vaporize into steam; a second channel is formed inside the inner tube for flames and flue gas to pass through. The combustion chamber (not shown in the figure) is located above the steam chamber 7 and is used to generate flames and flue gas; And the flue gas chamber (not shown in the figure) is located below the water storage chamber 8; The upper end of the first channel is connected to the steam chamber 7, and the lower end is connected to the water storage chamber 8; the upper end of the second channel is connected to the combustion chamber, and the lower end is connected to the flue gas chamber.

[0064] The upper end of the outer pipe 2 extends into the steam chamber 7 and is sealed and connected, and the lower end of the outer pipe 2 extends into the water storage chamber 8 and is sealed and connected; the upper end of the inner pipe 1 passes through the steam chamber 7 and is connected to the combustion chamber, and the lower end of the inner pipe 1 passes through the water storage chamber 8 and is connected to the flue gas chamber; several sleeve structures 10 are provided and are arranged between the water storage chamber 8 and the steam chamber 7. In this process, the flame generated in the combustion chamber first flows downward through the second channel 4 of the sleeve structure 10 to a certain height, and then turns into flue gas. The flue gas continues to move downward and flows into the flue gas chamber. During this process, the temperature in the second channel 4 gradually decreases from top to bottom. The water in the water storage chamber 8 is directly sent from bottom to top into the first channel 3. That is to say, as the water flows from bottom to top in the first channel, the temperature of the water gradually increases, which enables the water to vaporize quickly. The temperature of the vaporized steam also increases and enters the steam chamber 7 above the channel. Finally, the steam discharged from the steam chamber 7 has higher purity and does not produce condensate.

[0065] It should be noted that steam chamber 7 is a sealed cylindrical or spherical cavity, welded from a high-temperature resistant metal (the same material as the casing structure to avoid sealing failure due to differences in thermal expansion coefficients). Its main function is to collect and stably output the steam generated by each casing structure. Steam chamber 7 is equipped with a steam outlet pipe (with a valve to control the steam output), and its side walls have evenly spaced interfaces matching the number of casing structures (for the upper end of outer pipe 2 to extend and seal), ensuring that the steam generated by each casing structure can be synchronously collected.

[0066] The water storage chamber 8 is a sealed cylindrical cavity, also made of high-temperature resistant metal. Its main function is to store water to be heated and to evenly distribute the water to the first channel 3 of each casing structure. A water inlet pipe (with a flow control valve for adjusting the inlet speed) is located on one side of the water storage chamber 8. An interface matching the number of casing structures is opened at the top of the water storage chamber 8 (for the lower end of the outer pipe 2 to extend into and seal the connection), ensuring that the water can be evenly distributed to each casing structure through water pressure, without localized water shortages.

[0067] The flue gas chamber is a sealed, flat, round or cylindrical cavity fixed at the lower end of the water storage chamber 8. It is made of high-temperature and corrosion-resistant metal material (resistant to high temperature and acid corrosion of flue gas) and mainly collects flue gas.

[0068] The combustion chamber uses an oil or gas burner (suitable for industrial or civil applications), installed directly above the steam chamber 7 with the flame outlet facing downwards. Its primary function is to generate a high-temperature flame, which is then directed into the second channel 4 of the sleeve structure. The burner's flame outlet is aligned with the upper end of the inner tube 1 of the sleeve structure, and a pre-installed gap is provided between the outlet and the upper end of the inner tube 1 (ensuring the high-temperature flame can directly enter the second channel 4 of the inner tube 1 while preventing the flame from directly scorching the inner tube 1 wall and causing localized overheating). The flow paths of the flame and smoke are as follows: After the combustion chamber is ignited, a high-temperature flame is generated and flows downwards into the second channel 4 of the sleeve structure. Inside the second channel 4, the flame is slowly flowing downwards along a spiral path under the action of the spiral baffle 51, the baffle, and the guide groove 515. During this process, the flame gradually disappears and flue gas is generated. The heat of the flame and flue gas is transferred to the water in the first channel 3 through the wall of the inner tube 1, realizing heat exchange with the water. The temperature of the flame and flue gas decreases from top to bottom. Finally, the flue gas flows out from the lower end of the inner tube 1 and enters the flue gas chamber.

[0069] The water gradually absorbs heat from the flames and flue gas and vaporizes into steam through a bottom-in, top-out flow path. The specific process is as follows: The water to be heated enters the lower water storage chamber 8 through the inlet pipe into the first channel 3. Under water pressure, it is evenly distributed to all the sleeve structures in the first channel 3 and flows upward along the first channel 3. During the upward flow of the vaporized water in the first channel 3, it first absorbs the heat transferred by the flue gas, and the water temperature gradually increases, gradually vaporizing from liquid to steam. Then, it passes through the flame with increasing temperature, which further heats it up, causing the steam temperature to gradually increase until it becomes saturated steam, which then enters the steam chamber 7 and is finally discharged from the outlet end of the steam chamber 7.

[0070] Example 6:

[0071] This embodiment is a further improvement based on Embodiment 5.

[0072] As shown in Figures 1-8, this embodiment further includes: a preheating chamber 9, which is located below the flue gas chamber. The preheating chamber 9 has a preheating water chamber and a preheater located in the preheating water chamber. The preheater has a coil structure. The inlet of the water storage chamber 8 is connected to the outlet of the preheating chamber via a pipe, and the outlet of the flue gas chamber is connected to the inlet of the preheater via a pipe.

[0073] By setting up a preheating chamber 9, the heat from the flue gas can preheat the water located in the preheating water chamber, and then the preheated water is sent into the water storage chamber 8. On the one hand, this further accelerates the vaporization rate of the water in the first channel 4; on the other hand, it achieves efficient utilization of the flue gas and improves the exchange efficiency.

[0074] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A steam generator for producing high-purity steam, characterized in that, include: A steam chamber (7) and a water storage chamber (8) are arranged vertically. Several sleeve structures (10) are circumferentially distributed between the steam chamber (7) and the water storage chamber (8); each includes an inner tube (1) and an outer tube (2) sleeved outside the inner tube (1); a first channel (3) is formed between the inner tube (1) and the outer tube (2) for water to flow and vaporize into steam; a second channel (4) is formed inside the inner tube (1) for flames and flue gas to pass through. A combustion chamber, located above the steam chamber (7), is used to generate flames and smoke; And a flue gas chamber, located below the water storage chamber (8); The upper end of the first channel (3) is connected to the steam chamber (7), and the lower end is connected to the water storage chamber (8); the upper end of the second channel (4) is connected to the combustion chamber, and the lower end is connected to the flue gas chamber.

2. The steam generator for generating high-purity steam as described in claim 1, characterized in that, Also includes: A preheating chamber (9) is located below the flue gas chamber. The preheating chamber (9) has a preheating water chamber and a preheater located in the preheating water chamber. The inlet of the water storage chamber (8) is connected to the outlet of the preheating chamber via a pipe, and the outlet of the flue gas chamber is connected to the inlet of the preheater via a pipe.

3. The steam generator for producing high-purity steam as described in claim 2, characterized in that, The preheater has a coil-type structure.

4. The steam generator for generating high-purity steam as described in claim 1, characterized in that, Also includes: A heat-absorbing part (6) is disposed in the first channel (3); the heat-absorbing part (6) includes a plurality of heat-absorbing plates (61) in a ring structure, and adjacent heat-absorbing plates (61) are stacked and arranged along the axial direction; The heat absorber (61) has a baffle ring (62) extending radially outward at its bottom, and the baffle ring (62) has a slot (621) extending vertically through it; the slots (621) on the baffle rings (62) of adjacent heat absorbers (61) are staggered.

5. The steam generator for generating high-purity steam as described in claim 4, characterized in that, The heat-absorbing part further includes a fixing rod, which passes through each of the heat-absorbing sheets in sequence and limits each of the heat-absorbing sheets in the radial direction.

6. The steam generator for generating high-purity steam as described in claim 4, characterized in that, The heat-absorbing sheet has several notches on its sidewall, and the notches are distributed along the circumference of the heat-absorbing sheet.

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