Thermal deoxidizing device of steam generator and air conditioning system

Abstract

The utility model discloses a thermal deoxidizing device of a steam generator and an air conditioning system. The thermal deoxidizing device is installed in the steam generator. The thermal deoxidizing device comprises an outer cylinder and an inner cylinder which are coaxially nested, a gap is formed between the outer cylinder and the inner cylinder, an opening is formed in the top end of the gap in the circumferential direction, and a plurality of first through holes are formed in the inner cylinder in the circumferential direction; a multi-step baffle structure and a spiral spraying structure are arranged in the inner cylinder body from top to bottom; the inner cylinder is provided with a water inlet and an air outlet corresponding to the spiral spraying structure, and the bottom end of the inner cylinder is provided with a liquid outlet. According to the utility model, the thermal deoxidization device is arranged in the steam generator, and a heat source is provided for the thermal deoxidization device through the high-temperature steam in the steam generator, so that water which is not deoxidized in the thermal deoxidization device is heated to form deoxidized water, the oxidation corrosion speed of the steam generator is slowed down, and the heat loss is reduced.

Description

Technical Field

[0001] This utility model relates to the field of steam generation technology, and in particular to a thermal deoxygenation device for a steam generator and an air conditioning system. Background Technology

[0002] Flooded evaporators are widely used in refrigeration, chemical and other industries due to their low cost and high stability. A steam generator is based on the structure of a flooded evaporator, replacing the refrigerant on the shell side with water, while the water side is filled with other heat transfer fluids that heat the water on the shell side through heat exchange tubes to produce steam.

[0003] During operation, water enters the shell-side space through the inlet pipe and immerses the heat exchange tubes, where it exchanges heat with the liquid inside for evaporation. During the steam generation process, the sealing surfaces of the heat exchange tubes, support plates, and tube sheets are in prolonged contact with the high-temperature, turbulent water flow, and there are numerous assembly joints and weld gaps. This environment easily leads to severe oxidation and corrosion of the shell and tube materials, potentially causing serious accidents. Removing dissolved oxygen from the water can effectively slow down the rate of oxidation and corrosion. There are many deoxygenation methods, such as thermal deoxygenation, vacuum deoxygenation, chemical deoxygenation, and rust deoxygenation.

[0004] The principle of thermal deoxygenation is based on the Henry Dalton theorem: the closer water is to saturation, the lower the dissolved oxygen content. When water is heated to saturation, the vapor pressure at the water surface approaches the total pressure at the water surface, and the partial pressure of dissolved oxygen in the water approaches zero. The water supply no longer has the capacity to dissolve the gas, and the dissolved gas will precipitate out. The precipitated oxygen needs to overcome surface energy and simultaneously pass through the gas-liquid interface into the vapor.

[0005] There is no suitable thermal deaeration device for the inside of the steam generator in the existing design. It is often necessary to install an additional bracket on the outside of the steam generator, which not only increases the maintenance cost but also increases the footprint. Furthermore, the external thermal deaeration device often requires an additional heating system, which not only increases energy consumption but also makes it difficult to recover residual heat. Utility Model Content

[0006] This utility model provides a thermal deoxygenation device and air conditioning system for a steam generator, which solves the problem in the prior art where the thermal deoxygenation device is installed outside the steam generator, making it impossible to use the water vapor inside the steam generator for thermal deoxygenation, resulting in large heat loss.

[0007] The technical solution of this utility model is a thermal deoxygenation device for a steam generator, wherein the thermal deoxygenation device is installed inside the steam generator;

[0008] The thermal deoxygenation device includes:

[0009] The outer cylinder and the inner cylinder are coaxially nested, with a gap between the outer cylinder and the inner cylinder, and an opening is provided at the top of the gap along the circumferential direction. The inner cylinder is provided with a plurality of first through holes along the circumferential direction.

[0010] The inner cylinder has a multi-level stepped baffle structure and a spiral spray structure from top to bottom; the inner cylinder has a water inlet and an air outlet corresponding to the spiral spray structure, and the bottom of the inner cylinder has a liquid outlet.

[0011] Furthermore, the spiral spray structure includes a support shaft, spiral guide vanes, and a water inlet pipe;

[0012] The inner cylinder is provided with a support shaft along the axial direction. The outer surface of the support shaft is spirally fitted with a spiral guide vane with a gradually varying pitch. The spiral guide vane extends radially and completely covers the corresponding radial section of the inner cylinder.

[0013] The outer surface of the support shaft is wound with a water inlet pipe corresponding to the spacing of the spiral guide vanes. The water inlet pipe is connected to the water inlet. The water inlet pipe is provided with multiple second through holes in the radial direction corresponding to the spacing of the spiral guide vanes.

[0014] Furthermore, the spiral guide vane is divided into a rear spiral section, a middle spiral section, and a front spiral section along the axial direction from top to top;

[0015] The spacing of the spiral guide vanes located in the front spiral section increases sequentially from the middle spiral section toward the bottom end of the inner cylinder;

[0016] The spacing of the spiral guide vanes located in the middle spiral section decreases sequentially from the front spiral section to the rear spiral section;

[0017] The spacing of the spiral guide vanes located in the rear spiral section increases sequentially from the middle spiral section toward the top of the inner cylinder.

[0018] Furthermore, the angle between the spiral guide vane located in the middle spiral section and the support shaft increases sequentially from the front spiral section to the rear spiral section.

[0019] Furthermore, the inner region of the spiral guide vane near the support shaft is provided with multiple guide grooves along its spiral direction;

[0020] The spiral guide vane has multiple third through holes along its spiral direction in the outer region away from the support shaft.

[0021] Furthermore, the multi-stage stepped baffle structure includes a first-stage baffle, a second-stage baffle, and a third-stage baffle;

[0022] The support shaft extending from the top of the spiral guide vane is provided with a first-stage baffle, a second-stage baffle, and a third-stage baffle arranged circumferentially and staggered from top to bottom to form a stepped labyrinth structure.

[0023] The first-level baffle, the second-level baffle, and the third-level baffle all extend radially and completely cover the corresponding radial cross-section of the inner cylinder.

[0024] Furthermore, the vertical spacing between the primary baffle, the secondary baffle, and the tertiary baffle decreases sequentially from bottom to top to form a contraction flow channel.

[0025] Furthermore, the first-stage baffle, the second-stage baffle, and the third-stage baffle are covered with a hydrophilic coating on the side facing the spiral spray structure;

[0026] The first-stage baffle, the second-stage baffle, and the third-stage baffle are covered with a hydrophobic coating on the side opposite to the spiral spray structure.

[0027] Furthermore, a gas-liquid filter screen is installed on the gas outlet.

[0028] Furthermore, a circumferential return flow hole is provided at the bottom of the side wall of the inner cylinder, which is used to return the deoxygenated water in the gap to the inner cylinder.

[0029] Furthermore, the bottom end of the inner cylinder is provided with a flow equalization plate structure, and the bottom of the flow equalization plate structure is provided with a liquid collection structure at an incline, the bottom end of the liquid collection structure being a liquid outlet;

[0030] The flow equalization holes on the flow equalization plate structure are all connected to the liquid outlet.

[0031] This utility model also proposes an air conditioning system, which includes the thermal deoxygenation device of the steam generator described above.

[0032] Compared with the prior art, the present invention has at least the following beneficial effects:

[0033] This invention reduces the footprint and maintenance costs of the steam generator by installing a thermal deoxygenation device inside the steam generator. The high-temperature steam within the steam generator provides a heat source for the thermal deoxygenation device, heating the undeoxygenated water to form deoxygenated water. Gas-liquid separation is then achieved through a spiral spray structure and a multi-stage stepped baffle structure, preventing oxygen from re-dissolving into the deoxygenated water. This slows down the oxidation and corrosion rate of the steam generator, extends its service life, and efficiently utilizes the waste heat of the steam generator, improving waste heat recovery and reducing heat loss. Attached Figure Description

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects and not to describe a particular order.

[0035] To more clearly illustrate the technical solutions in the embodiments of this utility model, 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.

[0036] Figure 1 This is a schematic diagram of the internal structure of the thermal deoxygenation device proposed in this utility model;

[0037] Figure 2 for Figure 1 An enlarged schematic diagram of reference numeral A in the attached figure;

[0038] Figure 3 for Figure 1 An enlarged view of reference numeral B in the attached diagram;

[0039] Figure 4 This is a schematic diagram of the inner cylinder structure proposed in this utility model;

[0040] Figure 5 This is a partial structural diagram of the spiral spray structure proposed in this utility model;

[0041] Figure 6 This is a partial structural diagram of the multi-level stepped baffle structure proposed in this utility model.

[0042] Figure 7 This is a schematic diagram of the internal structure of the steam generator proposed in this utility model;

[0043] Figure 8 for Figure 7 An enlarged schematic diagram of reference numeral C in the attached figure.

[0044] Figure label:

[0045] 1. Outer cylinder;

[0046] 2. Inner cylinder; 21. First through hole; 22. Water inlet; 23. Air outlet; 24. Liquid outlet; 25. Gas-liquid filter screen; 26. Return flow hole;

[0047] 3. Gaps;

[0048] 4. Multi-stage stepped baffle structure; 41. First-stage baffle; 42. Second-stage baffle; 43. Third-stage baffle;

[0049] 5. Spiral spray structure; 51. Support shaft; 52. Spiral guide vane; 521. Rear spiral section; 522. Middle spiral section; 523. Front spiral section; 53. Water inlet pipe; 531. Second through hole; 54. Guide groove; 55. Third through hole;

[0050] 6. Flow equalization plate structure; 61. Flow equalization orifice; 62. Flow equalization plate; 63. Liquid storage space;

[0051] 7. Liquid collection structure;

[0052] 8. Support plate; 81. Fourth through hole;

[0053] 9. Mounting plate;

[0054] 10. Air outlet pipe. Detailed Implementation

[0055] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. Therefore, a feature pointed out in this specification is used to describe one feature of one embodiment of the present utility model, and does not imply that every embodiment of the present utility model must have the described feature. Furthermore, it should be noted that this specification describes many features. Although certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0056] The principle and structure of this utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0057] In one embodiment, such as Figure 1 , Figure 4 and Figure 7 As shown, this embodiment proposes a thermal deaeration device for a steam generator, which is installed in the steam generation chamber of the steam generator;

[0058] The thermal deoxygenation device includes:

[0059] The outer cylinder 1 and the inner cylinder 2 are coaxially nested, with a gap 3 formed between the outer cylinder 1 and the inner cylinder 2. The top of the gap 3 is continuously provided with an opening along the circumferential direction, and the lower part of the outer side wall of the inner cylinder 2 is provided with a plurality of first through holes 21 along the circumferential direction.

[0060] The inner cylinder 2 is provided with a multi-stage stepped baffle structure 4 and a spiral spray structure 5 from top to bottom; the top of the inner cylinder 2 is provided with a water inlet 22 and an air outlet 23 corresponding to the spiral spray structure 5, and the bottom of the inner cylinder 2 is provided with a liquid outlet 24 that communicates with the steam generator.

[0061] It should be noted that the bottom ends of both the outer cylinder 1 and the inner cylinder 2 are assembled by welding. Furthermore, the water inlet 22 proposed in this embodiment can also be located on the side wall of the inner cylinder 2 above the multi-stage stepped baffle structure 4, which is not limited here. When the outer cylinder 1 and the inner cylinder 2 are coaxially nested, the top end of the outer cylinder 1 is designed to be open, so that the top end of the inner cylinder 2 extends out from the opening of the outer cylinder 1.

[0062] It is understood that, in this embodiment, "from top to bottom" refers to the end of the inner cylinder 2 with the air outlet 23 facing the end of the inner cylinder 2 with the liquid outlet 24. Furthermore, the steam generator proposed in this embodiment includes components such as heat exchange tubes and valve assemblies that are present in existing steam generators, and is not limited thereto.

[0063] When the steam generator produces high-temperature steam, the high-temperature steam can enter through the opening of the slit 3 and enter the inner cylinder 2 through the first through hole 21, thereby ensuring that the internal environment of the inner cylinder 2 is filled with the high-temperature steam generated by the steam generator. Then, the undeoxygenated water from the steam generator is fed into the spiral spray structure 5 through the inlet 22. The spiral spray structure 5 then sprays the undeoxygenated water onto its surface. The sprayed water is then heated to saturation by high-temperature steam. At this point, the steam pressure on the water surface is close to the total pressure of the water surface, and the partial pressure of dissolved oxygen in the water is close to zero. The water supply does not have the ability to dissolve gases, so the dissolved oxygen will precipitate. The precipitated oxygen will inevitably mix with water vapor and droplets to form a gas-liquid mixture. This gas-liquid mixture will rise along the spiral spray structure 5 and collide with the multi-stage stepped baffle structure 4 to further separate the gas-liquid mixture. The gas in the gas-liquid mixture will be discharged from the outlet 23, and the droplets in the gas-liquid mixture will flow back to the spiral spray structure 5 and flow with the deoxygenated water to the outlet 24 and be discharged, thereby preventing oxygen from dissolving back into the water.

[0064] Therefore, this utility model reduces the footprint and maintenance costs of the steam generator by installing the thermal deoxygenation device inside the steam generator. It also provides a heat source for the thermal deoxygenation device using the high-temperature steam inside the steam generator, heating the undeoxygenated water inside the device to form deoxygenated water. This slows down the oxidation and corrosion rate of the steam generator, extends its service life, and also efficiently utilizes the waste heat of the steam generator, improving the waste heat recovery rate and reducing heat loss.

[0065] In some embodiments, such as Figures 1-2 As shown, the spiral spray structure 5 includes a support shaft 51, a spiral guide vane 52, and a water inlet pipe 53;

[0066] The inner bottom wall of the inner cylinder 2 is provided with a support shaft 51 along the axial direction in the middle. The outer surface of the support shaft 51 is spirally mounted with a spiral guide vane 52 with a gradually changing pitch. The spiral guide vane 52 extends radially and completely covers the corresponding radial section of the inner cylinder 2.

[0067] The outer surface of the support shaft 51 is wound with a water inlet pipe 53 corresponding to the spacing of the spiral guide vanes 52. The water inlet pipe 53 is connected to the water inlet 22. The water inlet pipe 53 is provided with a plurality of second through holes 531 in the radial direction corresponding to the spacing of the spiral guide vanes 52.

[0068] It should be noted that this embodiment proposes a structure of a spiral guide vane 52 and a water inlet pipe 53: the water inlet pipe 53 is spirally wound around the outer surface of the support shaft 51, and the spiral guide vane 52 extends from the outer surface of the water inlet pipe 53 along the circumferential tangential direction, thereby forming a composite swirling flow field, so that the water that has not been deoxygenated can be evenly sprayed onto the surface of the spiral guide vane 52 in the form of a liquid film through the second through hole 531 of the water inlet pipe 53.

[0069] In this way, the inlet pipe 53 is connected to the inlet 22 so that the inlet 22 can supply undeoxygenated water to the inlet pipe 53. Then, the inlet pipe 53 sprays the undeoxygenated water onto the surface of the spiral guide vane 52 in a spray form through the second through hole 531 to form a liquid film. The liquid film then exchanges heat with the high-temperature water vapor. The undeoxygenated water flows spirally downward along the spiral guide vane 52. At this time, the undeoxygenated water will exchange heat with the high-temperature water vapor and reach a saturated state, causing the dissolved oxygen in the water to precipitate. Then, the oxygen-containing gas-liquid mixture will rise along the spiral guide vane 52; the deoxygenated water (deoxygenated water, the same throughout) will fall along the spiral guide vane 52 and be discharged from the thermal deoxygenation device from the liquid outlet 24. During the rising process, the spiral guide vane 52 with a gradually varying pitch design can accelerate the local airflow, increase the Stokes number, and enhance the collision efficiency of small droplets in the gas-liquid mixture, thereby improving the separation efficiency of small droplets from the gas-liquid mixture.

[0070] In some embodiments, to ensure an increase in the Stokes number, thereby enhancing the collision efficiency of tiny droplets in the gas-liquid mixture, and thus improving the separation efficiency of tiny droplets from the gas-liquid mixture, such as... Figure 5 As shown, the spiral guide vane 52 is divided into a rear spiral section 521, a middle spiral section 522 and a front spiral section 523 along the axial direction from top to top.

[0071] The spacing of the spiral guide vanes 52 located in the front spiral section 523 increases sequentially from the middle spiral section 522 toward the bottom end of the inner cylinder 2;

[0072] The spacing of the spiral guide vanes 52 located in the middle spiral section 522 decreases sequentially from the front spiral section 523 to the rear spiral section 521, thereby forming a local velocity acceleration region and significantly enhancing the centrifugal collection efficiency of tiny droplets.

[0073] The spacing of the spiral guide vanes 52 located in the rear spiral section 521 increases sequentially from the middle spiral section 522 toward the top of the inner cylinder 2.

[0074] In this way, the gas-liquid mixture forms a primary swirling field during its ascent in the front spiral section 523, thereby removing larger droplets. Then, as the gas-liquid mixture passes through the middle spiral section 522, due to internal pressure, it is accelerated by the densely arranged spiral guide vanes 52, causing the droplets inside the mixture to be ejected, thus achieving secondary separation. Then, as the gas-liquid mixture passes through the rear spiral section 521, it undergoes a third separation of droplets, thereby removing droplets from the gas-liquid mixture to the greatest extent possible and preventing the gas discharged from the thermal deaerator from being mixed with droplets, which would affect the normal operation of the steam generator.

[0075] Specifically, in order to enhance boundary layer disturbance and improve the collision efficiency of droplets in the middle spiral section 522, the angle between the spiral guide vane 52 located in the middle spiral section 522 and the support shaft 51 increases sequentially from the front spiral section 523 to the rear spiral section 521 and the change gradually becomes gentler.

[0076] To facilitate understanding, this embodiment also provides a set of specific values ​​for the included angles that increase sequentially:

[0077] The included angles between the spiral guide vane 52 located in the middle spiral section 522 and the support shaft 51 are, in sequence: 80°, 82°, 83°, 83.5°, ... Of course, the included angles proposed in this embodiment can also be selected as other angles according to the actual situation, and are not limited here.

[0078] In some embodiments, such as Figure 3 As shown, the spiral guide vane 52 has a plurality of V-shaped guide grooves 54 in the inner region near the support shaft 51 along its spiral direction.

[0079] The spiral guide vane 52 has multiple third through holes 55 along its spiral direction in the outer region away from the support shaft 51.

[0080] In this way, the V-shaped guide groove 54 can generate micro-vortices, creating a velocity gradient difference between adjacent droplets, increasing the collision probability, accelerating the fusion and coalescence of the liquid film on the droplet surface, and then flowing downwards along the spiral guide plate 52 and being discharged from the outlet 24. Furthermore, it cannot be guaranteed that all droplets in the gas-liquid mixture will enter the guide groove 54; some droplets will always splash or flow to the outer region of the spiral guide plate 52 due to other circumstances. At this time, the droplets located in the outer region of the spiral guide plate 52 can flow back and converge downwards along the third through hole 55.

[0081] In other embodiments, the spiral guide plate 52 can be uniformly provided with multiple third through holes 55 in all areas except for the area where the guide groove 54 is provided, which is not limited here.

[0082] In some embodiments, such as Figure 6 As shown, the multi-stage stepped baffle structure 4 includes a first-stage baffle 41, a second-stage baffle 42, and a third-stage baffle 43;

[0083] The support shaft 51 extending from the top of the spiral guide vane 52 is provided with a first-level baffle 41, a second-level baffle 42 and a third-level baffle 43 arranged circumferentially and staggered from top to bottom to form a stepped maze structure.

[0084] The first-stage baffle 41, the second-stage baffle 42, and the third-stage baffle 43 all extend radially and completely cover the corresponding radial cross-section of the inner cylinder 2.

[0085] In this way, when the gas-liquid mixture passes through the first-stage baffle 41, the second-stage baffle 42, and the third-stage baffle 43, which are designed with a stepped labyrinth structure, the gas-liquid mixture is forced to turn multiple times along the stepped path, effectively extending the flow path and the contact time between the gas-liquid mixture and the baffle. Furthermore, the boundary layer separation effect generated when the gas-liquid mixture passes through the edge of each baffle creates a local vortex flow field, causing velocity differences between different phases of substances in the gas-liquid mixture, which significantly enhances the separation efficiency of tiny droplets from the gas-liquid mixture.

[0086] In some embodiments, the first-stage baffle 41, the second-stage baffle 42, and the third-stage baffle 43 are covered with a hydrophilic coating on the side facing the spiral spray structure 5;

[0087] The first-stage baffle 41, the second-stage baffle 42, and the third-stage baffle 43 are covered with a hydrophobic coating on the side opposite to the spiral spray structure 5.

[0088] It should be noted that the hydrophilic coating is preferably a nano-silica composite layer, and the hydrophobic coating is preferably a perfluoroalkylsiloxane polymer.

[0089] Thus, when the gas-liquid mixture passes through the spiral guide vane 52 and impacts the first-stage baffle 41, second-stage baffle 42, and third-stage baffle 43 at high speed, the hydrophilic coating reduces the surface tension of the droplets in the gas-liquid mixture, causing the droplets to rapidly spread into a thin liquid film after impact. This increases the contact area between the liquid film and the gas flow, accelerates liquid phase aggregation, and allows the liquid to flow along the spiral guide vane 52 to the outlet 24. Furthermore, the hydrophilic coating reduces the probability of droplet collision and rebound, minimizing the escape of small droplets. Conversely, the hydrophobic coating drives the droplets to migrate directionally through the guide channel 54, allowing the water from which oxygen has been separated to quickly leave the thermal deoxygenation device, preventing oxygen from re-dissolving into the deoxygenated water. The low adhesion properties of the hydrophobic coating shorten the droplet residence time, reducing the probability of secondary entrainment. Additionally, the low surface energy (surface energy <20 mJ / m²) of the hydrophobic coating further contributes to its effectiveness. 2 It inhibits the adsorption of pollutants and reduces the rate of scale buildup on the baffle.

[0090] In some embodiments, the vertical spacing between the primary baffle 41, the secondary baffle 42 and the tertiary baffle 43 decreases sequentially from bottom to top to form a contraction flow channel.

[0091] In this way, when the gas-liquid mixture passes through the constricted flow channel, it can gradually enhance its own airflow shear force. This airflow shear force can break the liquid film covering the hydrophilic coating into droplets, which then coalesce and flow to the guide groove 54. Furthermore, the hydrophobic coating and the airflow shear force work together to produce a self-cleaning effect, reducing the rate of fouling on the baffle.

[0092] In some embodiments, for further separation or filtration of droplets carried in oxygen, such as Figure 1 As shown, a gas-liquid filter screen 25 is installed on the air outlet 23.

[0093] In some embodiments, such as Figure 4 As shown, the bottom of the side wall of the inner cylinder 2 is also provided with a discontinuous circumferential return flow hole 26, which is used to return the deoxygenated water in the gap 3 to the inner cylinder 2.

[0094] When the water inlet pipe 53 sprays water through the second through hole 531, the water will inevitably leak through the first through hole 21 into the gap 3 and form a liquid film on the inner wall of the outer cylinder 1. At this time, the high temperature water vapor can also exchange heat with the liquid film on the inner wall of the outer cylinder 1 to a saturated state, so as to precipitate the oxygen dissolved in the water. Then the deoxygenated water flows down along the inner wall of the outer cylinder 1 and then converges. When the liquid level of the deoxygenated water is higher than the height of the return flow hole 26, the deoxygenated water in the gap 3 will flow into the inner cylinder 2 through the return flow hole 26 and then be discharged through the liquid outlet 24.

[0095] In some embodiments, such as Figure 1 As shown, the bottom end of the inner cylinder 2 is provided with a flow equalization plate structure 6, and the bottom of the flow equalization plate structure 6 is provided with a liquid collection structure 7 at an incline. The bottom end of the liquid collection structure 7 is a liquid outlet 24.

[0096] The flow equalization holes 61 on the flow equalization plate structure 6 are all connected to the liquid outlet 24.

[0097] Specifically, the flow equalization plate structure 6 includes two spaced flow equalization plates 62, each of which extends radially and completely covers the radial section of the corresponding inner cylinder 2; and a liquid storage space 63 is formed between the spaced flow equalization plates 62; and a liquid collection structure 7 in the shape of an inverted cone is inclinedly provided at the bottom of the lowest flow equalization plate 62.

[0098] In this way, the deoxygenated water in the inner cylinder 2 first flows through the uppermost flow equalization plate 62 to the liquid storage space 63, and then the deoxygenated water in the liquid storage space 63 flows through the lowermost flow equalization plate 62 to the liquid collection structure 7. The liquid collection structure 7 discharges the collected deoxygenated water through the liquid outlet 24 into the thermal deoxygenation device. In this way, the flow distribution of the deoxygenated water is more uniform through the two flow equalization plates 62, and the flow velocity of the local flow is not too high.

[0099] In some embodiments, such as Figure 1 and Figure 8 As shown, a support plate 8 is circumferentially arranged around the outer wall of the outer cylinder 1 corresponding to the lowest flow equalization plate 62. A mounting plate 9 is provided inside the steam generator corresponding to the support plate 8, and the support plate 8 and mounting plate 9 are welded together to fix the thermal deaerator inside the steam generator. Furthermore, each support plate 8 is provided with multiple fourth through holes 81, which facilitate the flow of water vapor inside the steam generator without affecting the flow path of the water vapor.

[0100] In some implementations, such as Figure 7 As shown, the steam generator's outlet pipe 10 should be located far away from the thermal deoxygenation device to ensure sufficient time to reduce the suction liquid carryover caused by the deoxygenated water flowing out of the steam outlet 24.

[0101] In some embodiments, the present invention also provides an air conditioning system, the air conditioning system including the thermal deoxygenation device of the steam generator described above.

[0102] In this way, when the air conditioning system is started, the steam generator starts and generates high-temperature steam. Then, the thermal deaerator located inside the steam generator uses the high-temperature steam as a heat source to heat the undeaerated water in the thermal deaerator to form deaerated water. This slows down the oxidation and corrosion rate of the steam generator, extends the service life of the steam generator, and can also efficiently utilize the waste heat of the steam generator, improve the waste heat recovery rate, and reduce heat loss.

[0103] Specifically, the working process of the thermal deaeration device is as follows:

[0104] First, the steam generator starts operating and generates high-temperature steam. Then, the high-temperature steam can enter the inner cylinder 2 through the opening of the slit 3 and the first through hole 21 in sequence, thereby ensuring that the internal environment of the inner cylinder 2 is filled with the high-temperature steam generated by the steam generator.

[0105] Then, the water that has not been deoxygenated in the steam generator is fed into the water inlet pipe 53 through the water inlet 22. The water inlet pipe 53 sprays the water that has not been deoxygenated onto the surface of the spiral guide plate 52 in the form of a liquid film through the second through hole 531. The liquid film then exchanges heat with the high temperature steam and reaches a saturated state, causing the oxygen dissolved in the water to be released. Then, the oxygen-containing gas-liquid mixture (equivalent to gas phase product) will rise along the spiral guide plate 52, while the deoxygenated water (liquid phase product) flows downward along the spiral guide plate 52 and is discharged from the liquid outlet 24.

[0106] During the ascent of the gas-liquid mixture, a primary swirling field is formed in the front spiral section 523, thereby removing larger droplets. When passing through the middle spiral section 522, due to the internal pressure, the gas-liquid mixture is accelerated in the densely arranged spiral guide vanes 52 in the middle spiral section 522, and the droplets inside the gas-liquid mixture are thrown out, thereby achieving secondary separation. During the process of passing through the rear spiral section 521, a third separation of droplets is carried out, thereby removing droplets from the gas-liquid mixture to the greatest extent.

[0107] The gas-liquid mixture then continues to rise through the rear spiral section 521 and passes through the stepped labyrinth structure formed by the first-stage baffle 41, the second-stage baffle 42 and the third-stage baffle 43, thereby further separating the liquid droplets in the gas-liquid mixture. Finally, the oxygen is discharged through the outlet 23.

[0108] The droplets separated by the spiral guide vane 52 and the multi-stage stepped baffle structure 4 then coalesce, flow downward along the spiral guide vane 52, and are discharged from the outlet 24.

[0109] Obviously, the embodiments described above are only some embodiments of this utility model, not all embodiments. The accompanying drawings show preferred embodiments of this utility model, but do not limit the patent scope of this utility model. This utility model can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this utility model.

Claims

1. A thermal deaerating device for a steam generator, characterized by, The thermal deaerator is installed inside the steam generator; The thermal deoxygenation device includes: The outer cylinder (1) and inner cylinder (2) are coaxially nested, with a gap (3) formed between the outer cylinder (1) and the inner cylinder (2), and the top of the gap (3) is provided with an opening along the circumferential direction. The inner cylinder (2) is provided with a plurality of first through holes (21) along the circumferential direction. The inner cylinder (2) is provided with a multi-level stepped baffle structure (4) and a spiral spray structure (5) from top to bottom; the inner cylinder (2) is provided with a water inlet (22) and an air outlet (23) corresponding to the spiral spray structure (5), and the bottom end of the inner cylinder (2) is provided with a liquid outlet (24).

2. The thermal deaerating apparatus of a steam generator according to claim 1, wherein The spiral spray structure (5) includes a support shaft (51), a spiral guide vane (52), and a water inlet pipe (53); The inner cylinder (2) is provided with a support shaft (51) along the axial direction. The outer surface of the support shaft (51) is spirally fitted with a spiral guide vane (52) with a gradually changing pitch. The spiral guide vane (52) extends radially and completely covers the corresponding radial section of the inner cylinder (2). The outer surface of the support shaft (51) is wound with an inlet pipe (53) corresponding to the spacing of the spiral guide vanes (52). The inlet pipe (53) is connected to the inlet (22). The inlet pipe (53) is provided with a plurality of second through holes (531) in the radial direction corresponding to the spacing of the spiral guide vanes (52).

3. The thermal deaerating apparatus of a steam generator according to claim 2, wherein The spiral guide vane (52) is divided into a rear spiral section (521), a middle spiral section (522) and a front spiral section (523) along the axial direction from top to top. The spacing of the spiral guide vanes (52) located in the front spiral section (523) increases sequentially from the middle spiral section (522) toward the bottom end of the inner cylinder (2); The spacing of the spiral guide vanes (52) located in the middle spiral section (522) decreases sequentially from the front spiral section (523) to the rear spiral section (521); The spacing of the spiral guide vanes (52) located in the rear spiral section (521) increases sequentially from the middle spiral section (522) toward the top of the inner cylinder (2).

4. The thermal deaerating apparatus of a steam generator according to claim 3, wherein The angle between the spiral guide vane (52) located in the middle spiral section (522) and the support shaft (51) increases sequentially from the front spiral section (523) to the rear spiral section (521).

5. The thermal deaerating apparatus of a steam generator according to claim 2, wherein The spiral guide vane (52) has multiple guide grooves (54) along its spiral direction in the inner region near the support shaft (51); The spiral guide vane (52) has a plurality of third through holes (55) in the outer region away from the support shaft (51) along its spiral direction.

6. The thermal deaerating apparatus of a steam generator according to claim 2, wherein The multi-stage stepped baffle structure (4) includes a first-stage baffle (41), a second-stage baffle (42), and a third-stage baffle (43); The support shaft (51) extending from the top of the spiral guide vane (52) is provided with a first-level baffle (41), a second-level baffle (42) and a third-level baffle (43) arranged circumferentially and staggered from top to bottom to form a stepped maze structure; The first-level baffle (41), the second-level baffle (42) and the third-level baffle (43) all extend radially and completely cover the radial section of the corresponding inner cylinder (2).

7. The thermal deaerating apparatus of a steam generator according to claim 6, wherein The vertical spacing between the first-stage baffle (41), the second-stage baffle (42), and the third-stage baffle (43) decreases sequentially from bottom to top to form a contraction flow channel.

8. The thermal deaeration device for a steam generator according to claim 6, characterized in that, The first-stage baffle (41), the second-stage baffle (42), and the third-stage baffle (43) are covered with a hydrophilic coating on the side facing the spiral spray structure (5); The first-stage baffle (41), the second-stage baffle (42), and the third-stage baffle (43) are covered with a hydrophobic coating on the side opposite to the spiral spray structure (5).

9. The thermal deaerating apparatus of a steam generator according to claim 1, wherein A gas-liquid filter screen (25) is installed on the air outlet (23).

10. The thermal deaerating apparatus of a steam generator according to claim 1, wherein The bottom of the side wall of the inner cylinder (2) is also provided with a return flow hole (26) in the circumferential direction. The return flow hole (26) is used to return the deoxygenated water in the gap (3) to the inner cylinder (2).

11. The thermal deaerating apparatus of a steam generator according to claim 1, wherein The bottom end of the inner cylinder (2) is provided with a flow equalization plate structure (6), and the bottom of the flow equalization plate structure (6) is provided with a liquid collection structure (7) at an incline. The bottom end of the liquid collection structure (7) is a liquid outlet (24). The flow equalization holes (61) on the flow equalization plate structure (6) are all connected to the liquid outlet (24).

12. An air conditioning system characterized by, The air conditioning system includes a thermal deaeration device for a steam generator as described in any one of claims 1-11.

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