Steam generator and heat pump unit

Abstract

The invention provides a steam generator and a heat pump unit. The steam generator comprises a shell, and a water inlet is formed in the shell; the water inlet is communicated with the interior of the shell, the deoxidizing structure is arranged in the shell and located above the liquid level in the shell, and the water inlet is communicated with the interior of the shell through the deoxidizing structure. According to the steam generator and the heat pump unit, the deoxidizing structure is arranged in the shell to directly deoxidize inlet water, the occupied space of the steam generator is reduced, the production cost for additionally arranging a thermal deaerator is reduced, the output capacity and the working efficiency of the steam generator are improved, the deoxidizing structure is arranged above the liquid level, and the deoxidizing effect is good. And oxygen at the separation position of the deoxidizing structure does not pass through liquid in the shell, so that corrosion of a heating structure for heating the liquid is avoided, and the structural reliability and the service life of the steam generator are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchange, in particular to a steam generator and a heat pump unit. Background Art

[0002] As a traditional large-capacity evaporator, the horizontal tube full liquid evaporator is widely used in air conditioning refrigeration, heat pump heating, chemical industry and other fields due to its low cost and strong stability. When the evaporator is in operation, the liquid to be evaporated fills the shell side space outside the heat exchange tube (the liquid level is usually slightly higher than the highest point of the heat exchange tube row), and the heat released by the fluid in the tube is transferred to the liquid outside the tube through the tube wall and the fins, causing the liquid to change phase, and the gas generated by boiling heat exchange is discharged from the top of the heat exchanger.

[0003] The horizontal tube full liquid evaporator can be used as a steam generating device. The shell side space outside the heat exchange tube is boiling water, and other hot working fluids in the tube heat the water through the heat exchange tube to turn it into high-temperature steam. In the high-temperature steam heat pump unit, the steam generator is a device that directly generates steam, and its durability is closely related to the water quality in the shell. If the dissolved oxygen content in the make-up water is too high, it will cause serious oxidation corrosion to the shell and tube materials, and even cause serious accidents.

[0004] When the high-temperature steam heat pump unit in the prior art uses a horizontal tube full liquid evaporator to produce steam, the temperature of the steam is relatively low. If a separate thermal deaerator is provided, part of the produced steam needs to be used to heat the inlet water of the horizontal tube full liquid evaporator, and the heated steam cannot be utilized, which makes the system of the heat pump unit complex, increases the cost, and even causes the problem of reduced performance of the heat pump unit. Summary of the invention

[0005] In order to solve the technical problem in the prior art that a thermal deaerator is separately provided and part of the steam needs to be used for heating, resulting in reduced performance of the heat pump unit, a steam generator and a heat pump unit are provided which integrate a deoxidation structure in a shell to avoid using part of the steam only for heating to improve performance and reduce system complexity.

[0006] A steam generator, comprising:

[0007] A shell body, wherein a water inlet is provided on the shell body;

[0008] A deoxygenation structure is disposed in the shell, and the deoxygenation structure is located above the liquid level in the shell, and the water inlet is connected to the inside of the shell through the deoxygenation structure.

[0009] The deoxidation structure comprises a plate body, wherein the plate body has a first side surface and a second side surface opposite to each other, wherein the second side surface faces the liquid surface in the shell, and the inlet water of the water inlet flows through the first side surface.

[0010] The plate body is provided with a flow hole, a first end of the flow hole is located on the first side surface, and a second end of the flow hole is located on the second side surface.

[0011] The deoxidation structure further includes a side plate, which is disposed on the first side surface, and the side plate and the first side surface together form a water storage tank.

[0012] A flow groove is arranged on a portion of the side plate away from the first side surface.

[0013] The deoxidation structure further includes a cover plate, which is disposed on a portion of the side plate away from the first side surface, and the cover plate, the side plate and the first side surface together form the water storage tank.

[0014] The number of the plate bodies is at least two, and all the plate bodies are stacked.

[0015] Along the direction close to the liquid surface in the shell, the flow area of ​​the flow holes on the plate body gradually decreases; and / or the flow holes on two adjacent plate bodies are staggered.

[0016] Along the direction away from the water inlet, the flow area of ​​the flow hole gradually increases.

[0017] The shell is provided with an air outlet, the air outlet is located on a side of the deoxidation structure away from the liquid surface in the shell, and a filtering structure is provided between the air outlet and the deoxidation structure.

[0018] The steam generator further includes a heat exchange tube, which is disposed in the shell and is located below the liquid level in the shell.

[0019] A heat pump unit comprises the above-mentioned steam generator.

[0020] The steam generator and heat pump unit provided by the present invention are provided with a deoxygenation structure in a shell to directly deoxygenate the incoming water, thereby avoiding the problem of complex structure caused by the need to additionally provide a thermal deaerator outside the steam generator in the prior art, reducing the occupied space of the steam generator, and reducing the production cost of the need to additionally provide a thermal deaerator. Moreover, the deoxygenation structure can directly heat and deoxygenate through the heat in the shell, and the steam heated by the deoxygenation structure can be mixed with other steam and can be reused, which can avoid the problem of part of the steam produced by the steam generator being required to be transported to the thermal deaerator for heating and unable to be reused, thereby improving the output capacity and working efficiency of the steam generator. Moreover, the deoxygenation structure is provided above the liquid level, and the oxygen at the separation point of the deoxygenation structure will not pass through the liquid in the shell, thereby avoiding corrosion of the heating structure for heating the liquid, and ensuring the structural reliability and service life of the steam generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of a steam generator provided in an embodiment of the present invention;

[0022] Figure 2 Another structural schematic diagram of a steam generator provided in an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of the structure of a deoxygenation structure provided in an embodiment of the present invention;

[0024] Figure 4 Another schematic diagram of the structure of the deoxygenation structure provided by an embodiment of the present invention;

[0025] Figure 5 Another structural schematic diagram of a steam generator provided in an embodiment of the present invention;

[0026] In the figure:

[0027] 1. Shell; 11. Water inlet; 2. Deaerator structure; 21. Plate body; 22. First side surface; 24. Flow hole; 25. Side plate; 26. Flow groove; 27. Cover plate; 12. Air outlet; 3. Heat exchange tube; 4. Filter structure. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so as to describe the embodiments of the present invention described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0031] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0032] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The horizontal tube full liquid evaporator can be used as a steam generating device. The shell side space outside the heat exchange tube is boiling water, and other hot working media in the tube heat the water through the heat exchange tube to turn it into high-temperature steam. In the high-temperature steam heat pump unit, the steam generator is a device that directly generates steam, and its durability is closely related to the water quality in the shell. If the dissolved oxygen content in the make-up water is too high, it will cause serious oxidative corrosion to the shell and tube materials and even cause serious accidents. When the high-temperature steam heat pump unit in the prior art uses a horizontal tube full liquid evaporator to produce steam, the temperature of the steam is relatively low. If a separate thermal deaerator is provided, part of the output steam needs to be used to heat the inlet water of the horizontal tube full liquid evaporator, and the heated steam cannot be used, which makes the system of the heat pump unit complex and the cost increased, and will also cause the problem of reduced performance of the heat pump unit. To this end, the present application provides a method such as Figures 1 to 5The steam generator shown includes: a shell 1, on which a water inlet 11 is provided; a deoxidation structure 2, which is arranged in the shell 1 and is located above the liquid level in the shell 1, and the water inlet 11 is connected to the inside of the shell 1 through the deoxidation structure 2. A deoxygenation structure 2 is provided in the shell 1 to directly deoxygenate the incoming water, thereby avoiding the problem of complex structure caused by the need to additionally provide a thermal deaerator outside the steam generator in the prior art, reducing the space occupied by the steam generator, and reducing the production cost of the need to additionally provide a thermal deaerator. Moreover, the deoxygenation structure 2 can directly heat and deoxygenate through the heat in the shell 1, and the steam heated by the deoxygenation structure 2 can be mixed with other steam and can be reused, which can avoid the problem of part of the steam produced by the steam generator being transported to the thermal deaerator for heating and being unable to be reused, thereby improving the output capacity and working efficiency of the steam generator. Moreover, the deoxygenation structure 2 is provided above the liquid level, and the oxygen at the separation point of the deoxygenation structure 2 will not pass through the liquid in the shell 1, thereby avoiding corrosion of the heating structure for heating the liquid, and ensuring the structural reliability and service life of the steam generator.

[0034] When the steam generator is in use, water flows into the deoxygenation structure 2 through the water inlet 11, and the water in the shell 1 is heated to generate steam. At this time, the steam will flow through the deoxygenation structure 2, thereby being able to heat the water in the deoxygenation structure 2 to achieve the purpose of deoxygenation. The steam that has completed heating the deoxygenation structure 2 is still in the shell 1, so it can be mixed with the unheated steam, ensuring the steam output of the steam generator. In addition, when water drips from the deoxygenation structure 2 to the liquid surface in the shell 1, the water will be hit by the floating bubbles and form more gas-liquid interfaces, and the remaining dissolved oxygen will be taken away by the floating bubbles to achieve the effect of secondary deoxygenation.

[0035] As an embodiment, the deoxygenation structure 2 includes a plate body 21, and the plate body 21 has a first side 22 and a second side facing each other, the second side facing the liquid surface in the shell 1, and the water inlet of the water inlet 11 flows through the first side 22. The water inlet of the water inlet 11 will spread on the first side 22 to form a thin liquid film. According to the Henry-Dalton theorem, the closer the water is to the saturated state, the greater the proportion of the partial pressure of water in the gas phase, and the easier it is for the oxygen dissolved in the water to precipitate. When the water is in a saturated state, the stable pressure in the gas phase is equal to the water saturation pressure, and the amount of oxygen dissolved in the water in the stable state is zero. At this time, when the dissolved oxygen overcomes the surface energy, bubbles will be generated in the water and escape from the water surface. When a thin liquid film is formed, a large number of discrete phase interfaces will be formed, so that the surface energy required for oxygen precipitation is greatly reduced, thereby effectively improving the deoxygenation efficiency. The deoxygenated water can detach from the first side 22 and drip toward the liquid surface in the shell 1. The steam generated in the shell 1 collides with the water droplets during the dripping process and forms more gas-liquid interfaces, so that the surface energy required for the oxygen in the water droplets to precipitate is greatly reduced. At the same time, the remaining dissolved oxygen will be carried away by the floating bubbles to achieve the effect of secondary deoxygenation, thereby further improving the deoxygenation efficiency.

[0036] The plate body 21 is provided with a flow hole 24, the first end of the flow hole 24 is located on the first side surface 22, and the second end of the flow hole 24 is located on the second side surface. The flow hole 24 facilitates the water on the first side surface 22 to drip downward, so that more water droplets can be formed in the process of water dripping to the liquid surface, and then more gas-liquid interfaces are formed, so that the surface energy required for the oxygen in the water droplets to precipitate is greatly reduced, and at the same time, the remaining dissolved oxygen will be taken away by the floating bubbles to achieve the effect of secondary deoxygenation, further improving the deoxygenation efficiency.

[0037] The deoxidation structure 2 further includes a side plate 25, which is disposed on the first side surface 22, and the side plate 25 and the first side surface 22 together form a water storage tank. The side plate 25 is used to prevent water from dripping directly from the first side surface 22, prolong the heating time of the plate body 21 by steam, thereby improving the deoxidation efficiency, and can also force water to flow from the flow holes 24, increase the amount of water droplets dripping from the flow holes 24, and thereby form more gas-liquid interfaces, so that the surface energy required for the oxygen in the water droplets to precipitate is greatly reduced, and at the same time, the remaining dissolved oxygen will be taken away by the floating bubbles to achieve the effect of secondary deoxidation, further improving the deoxidation efficiency.

[0038] A flow groove 26 is provided on the portion of the side plate 25 away from the first side surface 22. When the amount of water flowing to the first side surface 22 is too much, the water can flow out of the water storage tank through the flow groove 26, and can also form water drops or water columns, thereby avoiding the influence of the flow change of the water inlet 11 on the deoxidation efficiency of the deoxidation structure 2, and ensuring the reliability of the steam generator.

[0039] The deoxygenation structure 2 further includes a cover plate 27, which is disposed on a portion of the side plate 25 away from the first side surface 22, and the cover plate 27, the side plate 25 and the first side surface 22 together enclose the water storage tank. The cover plate 27 is used to partially seal the upper portion of the side plate 25 to prevent steam from entraining droplets from the water storage tank, and at the same time, it can also force water to flow out only through the flow groove 26, so as to ensure the ability of the flow groove 26 to form water droplets or water columns, thereby ensuring the deoxygenation efficiency of the deoxygenation structure 2. At the same time, the oxygen precipitated on the first side surface 22 can also be discharged through the flow groove 26, ensuring the reliable discharge of the precipitated oxygen.

[0040] The number of the plate bodies 21 is at least two, and all the plate bodies 21 are stacked, that is, all the plate bodies 21 are arranged in sequence along the direction close to the liquid surface in the shell 1. The water of the water inlet 11 can flow through all the plate bodies 21 in sequence, and at least two layers of thin liquid films are formed above the liquid surface of the shell 1 by using multiple plate bodies 21, which further increases the area of ​​the gas-liquid interface, and can also increase the time for water to spread and flow, improve the precipitation efficiency of dissolved oxygen in water, and achieve the purpose of improving the deoxygenation efficiency of the deoxygenation structure 2.

[0041] The flow area of ​​the flow holes 24 on the plate body 21 gradually decreases along the direction close to the liquid surface in the shell 1. By utilizing the change in the flow area of ​​the flow holes 24, the deaerator structure 2 can ensure that water can fully spread and flow under different water inflow conditions, thereby improving the deaerator efficiency of the steam generator under different working conditions.

[0042] Alternatively, the flow holes 24 on two adjacent plates 21 are staggered so that water droplets dripping from the flow holes 24 on the upper plate 21 cannot directly pass through the flow holes 24 on the lower plate 21, so that water can spread and flow on each plate 21, thereby ensuring the deoxygenation efficiency of the deoxygenation structure 2.

[0043] Along the direction away from the water inlet 11, the flow area of ​​the flow hole 24 gradually increases. Since the amount of water at the water inlet 11 is large, the area far away from the water inlet 11 requires the water to spread and flow in order to be reached. Therefore, the change in the flow area of ​​the flow hole 24 is utilized to make the water output of all the flow holes 24 basically uniform, thereby ensuring the efficiency of oxygen precipitation by water droplets or water columns generated at any flow hole 24, and further ensuring the deoxygenation efficiency of the deoxygenation structure.

[0044] The shell 1 is provided with an air outlet 12, which is located on the side of the deoxidation structure 2 away from the liquid surface in the shell 1, and a filter structure 4 is provided between the air outlet 12 and the deoxidation structure 2. Since the steam needs to flow through the deoxidation structure 2 to the air outlet 12, the steam can heat the deoxidation structure 2 and also carry some liquid droplets from the deoxidation structure 2 to the air outlet 12, which will increase the humidity of the produced steam. Therefore, the filter structure 4 is used to filter the steam that is about to flow to the air outlet 12 to reduce the steam humidity and ensure the steam quality.

[0045] The steam generator also includes a heat exchange tube 3, which is arranged in the shell 1 and is located below the liquid level in the shell 1. The high-temperature working medium introduced into the heat exchange tube 3 is used to heat the water in the shell 1 to generate steam. Since the inlet water is deoxygenated by the deoxygenation structure 2, the oxygen content in the liquid immersed in the heat exchange tube 3 is reduced, which can reduce the corrosion ability of the heat exchange tube 3 and improve the structural reliability and service life of the steam generator. Even if the oxygen content at the outlet 12 is too high and the service life of the pipeline connected to the outlet 12 is shortened, the difficulty of repairing and replacing the pipeline is much lower than that of repairing and replacing the steam generator, which effectively reduces the production cost and maintenance cost of the unit using the steam generator.

[0046] A heat pump unit comprises the above-mentioned steam generator.

[0047] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A steam generator, characterized in that: include: A housing (1), wherein the housing (1) is provided with a water inlet (11); A deoxygenation structure (2), the deoxygenation structure (2) is arranged in the shell (1), and the deoxygenation structure (2) is located above the liquid level in the shell (1), and the water inlet (11) is connected to the inside of the shell (1) through the deoxygenation structure (2).

2. The steam generator according to claim 1, characterized in that: The deoxidizing structure (2) comprises a plate body (21), wherein the plate body (21) has a first side surface (22) and a second side surface that are opposite to each other, wherein the second side surface faces the liquid surface in the shell (1), and the water entering the water inlet (11) flows through the first side surface (22).

3. The steam generator according to claim 2, characterized in that: The plate body (21) is provided with a flow hole (24), a first end of the flow hole (24) is located on the first side surface (22), and a second end of the flow hole (24) is located on the second side surface.

4. The steam generator according to claim 3, characterized in that: The deoxidation structure (2) further comprises a side plate (25), wherein the side plate (25) is arranged on the first side surface (22), and the side plate (25) and the first side surface (22) together form a water storage tank.

5. The steam generator according to claim 4, characterized in that: A flow groove (26) is provided on a portion of the side plate (25) away from the first side surface (22).

6. The steam generator according to claim 4, characterized in that: The deoxygenation structure (2) further comprises a cover plate (27), wherein the cover plate (27) is arranged on a portion of the side plate (25) away from the first side surface (22), and the cover plate (27), the side plate (25) and the first side surface (22) together form the water storage tank.

7. The steam generator according to claim 3, characterized in that: The number of the plate bodies (21) is at least two, and all the plate bodies (21) are stacked.

8. The steam generator according to claim 7, characterized in that: Along the direction close to the liquid surface in the shell (1), the flow area of ​​the flow holes (24) on the plate body (21) gradually decreases; and / or the flow holes (24) on two adjacent plate bodies (21) are staggered.

9. The steam generator according to claim 3, characterized in that: In a direction away from the water inlet (11), the flow area of ​​the flow hole (24) gradually increases.

10. The steam generator according to claim 1, characterized in that: The shell (1) is provided with an air outlet (12), the air outlet (12) is located on a side of the deoxygenation structure (2) away from the liquid surface in the shell (1), and a filtering structure (4) is provided between the air outlet (12) and the deoxygenation structure (2).

11. A heat pump unit, characterized in that: The invention comprises the steam generator according to any one of claims 1 to 10.

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