Screw compression based heat pump-exhaust heat dual recovery steam temperature raising system

Abstract

The present application relates to heat pump heat recovery technical field, specifically is related to based on screw compression heat pump - waste heat double recovery steam temperature rising system, including: base, ring storage module, vertical state is set on the base, the ring storage module is equipped with can store the outer storage unit and inner storage unit of steam and the condensed water in the outer storage unit and inner storage unit and can export the export pipe, flow guide module, rotation is set in the bottom of the base, the flow guide module is used to export the condensed water in the outer storage unit and inner storage unit, heat preservation module, vertical state is set on the base, the present application not only can be overall heat preservation protection to steam and can realize to the initiative of condensed water and drive away.

Description

Technical Field

[0001] This invention relates to the field of heat pump heat recovery technology, specifically to a heat pump-waste heat recovery steam heating system based on screw compressor. Background Technology

[0002] In industrial production processes, steam, as a crucial heat energy carrier, is widely used in heating, drying, reaction, and power transmission. Existing steam supply systems typically generate steam through centralized boilers or waste heat recovery devices and transport it to the steam-consuming end via pipelines. However, during the process of steam being transported from the heat source to the steam-consuming equipment and undergoing secondary heating and pressurization in the heat pump system, significant sensible heat loss is inevitable due to factors such as pipeline heat dissipation, temperature differences at equipment interfaces, and limited heat exchange efficiency. This results in a decrease in the steam temperature and enthalpy before it enters the subsequent heat pump compression unit. On the one hand, this heat is directly dissipated into the environment, causing energy waste; on the other hand, the decrease in initial steam parameters significantly increases the compression ratio and energy consumption of the heat pump system, not only reducing the overall system's energy efficiency ratio but also potentially exacerbating the mechanical load and operating losses of the screw compressor, affecting the long-term stability of the equipment.

[0003] Existing technologies for steam heating primarily focus on directly compressing and heating low-temperature steam using heat pumps or compression devices, while paying insufficient attention to the waste heat preservation and recovery process before the steam enters the heat pump. Although some systems incorporate insulation layers on the outside of the pipes or employ simple heat exchange and recovery structures, these largely only passively mitigate heat dissipation and fail to actively recover and reuse the steam's own waste heat. Furthermore, they are difficult to dynamically adjust based on changes in steam flow and temperature. In scenarios with significant operating fluctuations or long steam transport distances, steam heat loss becomes particularly pronounced, hindering further improvements in the overall energy efficiency of the steam heating system. Summary of the Invention

[0004] To address the aforementioned issues, a heat pump-waste heat recovery steam heating system based on screw compression is provided. This system proposes a device that can effectively recover and preserve the waste heat of externally supplied steam before it enters the heat pump for secondary compression and heating. This solves the technical problem that existing waste heat recovery devices often fail to adequately preserve the waste heat of steam before it enters the heat pump, leading to a decrease in initial steam parameters and a significant increase in the compression ratio and energy consumption of the heat pump system.

[0005] To address the problems of existing technologies, this invention provides a heat pump-waste heat recovery steam heating system based on screw compressor, comprising: a base; a ring storage module, vertically mounted on the base, the ring storage module having an outer storage unit and an inner storage unit for storing steam, and an outlet pipe for draining condensate from the outer and inner storage units; a flow guiding module, rotatably mounted at the bottom of the base, the flow guiding module being used to drain condensate from the outer and inner storage units; and a heat preservation module, vertically mounted on the base.

[0006] Preferably, the ring storage module further includes a first connecting pipe that connects the outer storage unit and the inner storage unit, and a steam inlet pipe and a steam outlet pipe that are respectively fixedly disposed on the top of the outer storage unit and the inner storage unit; the inner storage unit is centrally disposed inside the outer storage unit.

[0007] Preferably, the external storage unit is composed of multiple S-shaped bends connected in series end to end; the multiple S-shaped bends are arranged in a ring and connected in series, and each S-shaped bend has a vertically fixed outlet pipe at its bottom that communicates with the inside of the S-shaped bend; the outlet ends of the multiple outlet pipes pass vertically through the base and are arranged vertically toward the bottom of the base.

[0008] Preferably, the flow guiding module is provided with a rotary sealing plate that can control the dynamic opening and closing of the outlet end of the outlet tube; the rotary sealing plate is also provided with outlet ports that correspond one-to-one with the outlet ends of the multiple outlet tubes; in the non-drainage state, the outlet ports provided through the rotary sealing plate are located away from the outlet ends of the outlet tubes, and in the drainage state, the outlet ports provided through the rotary sealing plate are provided in correspondence one-to-one with the outlet ends of the multiple outlet tubes.

[0009] Preferably, the flow guiding module further includes a liquid collection tank for collecting condensate and a servo motor for driving the rotary sealing plate to rotate axially; the liquid collection tank is fixedly disposed at the bottom of the base and a coaxial cover is disposed outside the rotary sealing plate; the servo motor is vertically fixedly disposed at the bottom of the liquid collection tank and its output shaft passes through the liquid collection tank and is fixedly connected to the rotary sealing plate.

[0010] Preferably, the flow guiding module further includes a vibration motor capable of driving the external storage unit and the internal storage unit to oscillate; the vibration motor is centrally disposed on the base.

[0011] Preferably, the insulation module has an outer insulation chamber and an inner insulation chamber that can respectively enclose the outer storage unit and the inner storage unit in a ring shape; the inner insulation chamber is coaxially arranged inside the outer insulation chamber.

[0012] Preferably, the top of the outer insulation chamber is also fixedly provided with an inlet pipe that can introduce inert gas into the outer insulation chamber.

[0013] The advantages of this invention compared to the prior art are:

[0014] 1. This invention, by setting up a ring storage module and a heat preservation module, effectively preserves and recovers the waste heat of steam before it enters the screw compressor heat pump. This avoids the rapid temperature decay of steam due to radiation, convection and heat conduction during long-distance transportation or waiting, so that the steam entering the heat pump is always maintained in a higher initial temperature range, thereby improving the secondary compression and heating efficiency of the heat pump from the source.

[0015] 2. This invention achieves directional collection and on-demand discharge of condensate through an S-shaped short-distance storage pipeline, segmented outlet pipe, rotary sealing plate, and servo-driven active drainage structure. This avoids the long-term retention of condensate in the steam channel, which forms a low-temperature heat sink, thereby effectively reducing the loss of latent heat of steam and significantly reducing the risk of water hammer impact caused by high-speed steam driving condensate. Attached Figure Description

[0016] Figure 1 This is a 3D diagram of a heat pump-waste heat recovery steam heating system based on screw compression.

[0017] Figure 2 This is a side view of a heat pump-waste heat recovery steam heating system based on screw compression.

[0018] Figure 3 yes Figure 2 Sectional view at point AA.

[0019] Figure 4 yes Figure 3 A magnified view of section B.

[0020] Figure 5 yes Figure 3 A magnified view of a portion of point C.

[0021] Figure 6 This is an exploded 3D diagram of a heat pump-waste heat recovery steam heating system based on screw compression.

[0022] Figure 7 yes Figure 6 A magnified view of a portion of point D.

[0023] Figure 8 This is an exploded 3D diagram of the ring storage module in a screw-compressed heat pump-waste heat recovery steam heating system.

[0024] The numbers on the map are:

[0025] 1. Base;

[0026] 2. Ring storage module; 21. External storage unit; 211. S-shaped bend; 22. Internal storage unit; 23. Outlet pipe; 24. First connecting pipe; 25. Steam inlet pipe; 26. Steam outlet pipe;

[0027] 3. Flow guiding module; 31. Swivel sealing plate; 311. Outlet; 32. Liquid collection tank; 33. Servo motor; 34. Vibration motor;

[0028] 4. Insulation module; 41. Outer insulation chamber; 42. Inner insulation chamber; 43. Inlet pipe. Detailed Implementation

[0029] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0030] See Figures 1 to 8 As shown: A heat pump-waste heat recovery steam heating system based on screw compressor includes: a base 1; an annular storage module 2, vertically mounted on the base 1, the annular storage module 2 having an outer storage unit 21 and an inner storage unit 22 for storing steam, and an outlet pipe 23 for discharging condensate from the outer storage unit 21 and the inner storage unit 22; a flow guiding module 3, rotatably mounted on the bottom of the base 1, the flow guiding module 3 being used to discharge condensate from the outer storage unit 21 and the inner storage unit 22; and a heat preservation module 4, vertically mounted on the base 1.

[0031] When steam needs to be stored, an external steam pipeline is first connected to the ring storage module 2, allowing high-temperature steam generated externally to be introduced into the ring storage module 2 via the external steam pipeline. The steam then flows in a ring along the storage ring within the ring storage module 2, completing the storage process. During steam storage, the storage ring is continuously enveloped by the insulation module 4. By reducing radiative and convective heat transfer, the ineffective loss of steam heat to the external environment is minimized, thereby ensuring that the steam remains at a relatively high temperature during storage.

[0032] During normal storage, localized heat loss is inevitable during the flow and residence of steam, causing some steam to undergo phase change and form condensate. If this condensate remains inside the annular storage module 2 for an extended period, it will not only form a low-temperature liquid heat sink, continuously absorbing heat from the steam and causing a further drop in steam temperature, but it will also be propelled by high-speed steam when the steam flow rate changes, inducing water hammer and potentially damaging the storage structure and pipeline safety. Therefore, by periodically or on demand activating the flow guiding module 3, the condensate formed within the storage ring is collected and guided out, thus achieving intermittent active removal of condensate and preventing its accumulation within the annular storage module 2.

[0033] It achieves continuous heat preservation of steam and active management of condensate during the storage process, significantly reducing the risk of temperature drop and water hammer caused by condensate retention, and improving the safety and heat retention efficiency of steam storage.

[0034] See Figure 8 As shown: The ring storage module 2 also includes a first connecting pipe 24 that connects the outer storage unit 21 and the inner storage unit 22, and a steam inlet pipe 25 and a steam outlet pipe 26 that are respectively fixedly disposed on the top of the outer storage unit 21 and the inner storage unit 22; the inner storage unit 22 is centrally disposed inside the outer storage unit 21.

[0035] When storing steam, the external steam pipe is connected to the steam inlet pipe 25, so that steam first fills the outer storage unit 21 and forms a circulatory flow in the outer storage unit 21; when the steam in the outer storage unit 21 reaches the set filling state, the steam is then introduced into the inner storage unit 22 through the first connecting pipe 24, thus forming a double-layer steam storage structure from the outside to the inside.

[0036] Since the internal storage unit 22 is centrally located inside the external storage unit 21, the high-temperature steam in the external storage unit 21 forms a ring-shaped enclosure around the internal storage unit 22, keeping the steam in the internal storage unit 22 in a stable high-temperature thermal environment. This achieves both ring-shaped steam conduction and buffered storage, while simultaneously creating multi-layered circumferential confinement and thermal shielding of the steam temperature, effectively slowing down heat diffusion outwards. When it is necessary to export the stored steam for subsequent heat pump compression or other processes, simply opening the steam export pipe 26 connected to the heat pump is sufficient to stably export the steam stored at high temperatures.

[0037] By using an inner and outer double-layer ring storage structure, multiple confinement and buffering of steam temperature are achieved, which greatly reduces heat decay during storage and improves the initial temperature level when steam is reused.

[0038] See Figure 7 and Figure 8As shown: The external storage unit 21 is composed of a plurality of S-shaped bends 211 connected in series end to end; the plurality of S-shaped bends 211 are arranged in a ring and connected in series, and each S-shaped bend 211 has an outlet pipe 23 that is vertically fixed at its bottom and communicates with the interior of the S-shaped bend 211; the outlet ends of the plurality of outlet pipes 23 all pass vertically through the base 1 and are arranged vertically toward the bottom of the base 1.

[0039] By setting up multiple sets of S-shaped bends 211 connected in series as steam storage channels, the overall storage path is divided into several relatively independent storage segments with controlled lengths, while ensuring sufficient steam storage volume. This effectively shortens the flow and residence distance of steam in a single segment. By shortening the steam conduction path within each storage segment, the probability of steam condensing due to prolonged residence in local areas can be significantly reduced, thus decreasing the amount of condensate generated within the pipes.

[0040] Meanwhile, an outlet pipe 23 connected to the lowest point of each S-shaped bend 211 is set so that the condensate will preferentially collect into the corresponding outlet pipe 23 under the action of gravity, thereby realizing the segmented independent guidance and centralized collection of the condensate in each S-shaped bend 211, and avoiding the condensate from stagnating in the bend and continuously absorbing heat.

[0041] By shortening the single-stage steam storage process and discharging condensate in stages, the steam heat loss caused by condensate retention is effectively suppressed, thereby improving the overall heat retention performance of the storage system.

[0042] See Figure 7 As shown: The flow guiding module 3 is provided with a rotary sealing plate 31 that can control the dynamic opening and closing of the outlet end of the outlet tube 23; the rotary sealing plate 31 is also provided with outlet ports 311 that correspond one-to-one with the outlet ends of the multiple outlet tubes 23; in the non-drainage state, the outlet ports 311 provided through the rotary sealing plate 31 are located away from the outlet ends of the outlet tubes 23; in the drainage state, the outlet ports 311 provided through the rotary sealing plate 31 are provided one-to-one with the outlet ends of the multiple outlet tubes 23.

[0043] In the non-drainage state, the outlet 311 through the rotary sealing plate 31 is staggered with the outlet ends of each outlet pipe 23, so that the outlet pipe 23 is in a closed state to prevent steam from leaking out of the outlet pipe 23 accidentally; in the drainage state, by driving the rotary sealing plate 31 to rotate axially, the outlet 311 on the rotary sealing plate 31 corresponds to the outlet ends of the multiple outlet pipes 23 one by one and is coaxially connected.

[0044] When it is necessary to centrally discharge the condensate collected in multiple S-shaped bends 211, it is only necessary to drive the rotary sealing plate 31 to complete the rotation of the preset angle, so as to selectively connect the target outlet pipe 23, thereby realizing the directional discharge and centralized recycling of condensate, without having to set an independent valve for each outlet pipe 23.

[0045] See Figure 4 and Figure 7 As shown: The flow guiding module 3 also includes a liquid collection tank 32 for collecting condensate and a servo motor 33 for driving the rotary sealing plate 31 to rotate axially; the liquid collection tank 32 is fixedly disposed at the bottom of the base 1 and coaxially covered outside the rotary sealing plate 31; the servo motor 33 is vertically fixedly disposed at the bottom of the liquid collection tank 32 and its output shaft passes through the liquid collection tank 32 and is fixedly connected to the rotary sealing plate 31.

[0046] When it is necessary to drain the condensate stored in the outlet pipe 23, an external power source drives the servo motor 33 to rotate. The output shaft of the servo motor 33 rotates and synchronously drives the rotary sealing plate 31 to rotate, thereby achieving coaxial docking or misalignment between the outlet port 311 on the rotary sealing plate 31 and the outlet end of the outlet pipe 23. Through precise control of the rotation angle of the servo motor 33, the condensate can be automatically discharged, and the discharged condensate is collected through the collection tank 32.

[0047] See Figure 7 and Figure 8 As shown: The flow guiding module 3 also includes a vibration motor 34 that can drive the external storage unit 21 and the internal storage unit 22 to oscillate; the vibration motor 34 is centrally located on the base 1.

[0048] In order to further eliminate the condensate water stuck on the inner walls of the outer storage unit 21 and the inner storage unit 22 due to adhesion, when it is necessary to remove the condensate water stuck on the inner wall, the vibration motor 34 is driven by an external power source to generate small-amplitude, high-frequency mechanical vibration in the outer storage unit 21 and the inner storage unit 22, thereby breaking the surface tension and adhesion state between the condensate water and the metal inner wall, so that the condensate water is quickly desorbed and collected in the drainage channel below.

[0049] Vibration-assisted desorption improves condensate drainage efficiency and reduces continuous heat absorption and temperature drop caused by water buildup on the inner wall.

[0050] like Figure 5 As shown: The insulation module 4 is provided with an outer insulation chamber 41 and an inner insulation chamber 42 that can respectively wrap the outer storage unit 21 and the inner storage unit 22 in a ring shape; the inner insulation chamber 42 is coaxially arranged inside the outer insulation chamber 41.

[0051] The outer insulation chamber 41 is an annular wall structure with a vacuum interlayer. The inner insulation chamber 42 is arranged in conjunction with the outer insulation chamber 41, respectively covering the outer storage unit 21 and the inner storage unit 22. The vacuum interlayer effectively suppresses heat conduction to the external environment by significantly reducing gas molecule heat transfer and convective heat transfer, thus forming a stable high-temperature insulation cavity inside the storage unit.

[0052] The vacuum sandwich insulation structure significantly reduces heat transfer loss during steam storage and improves the overall insulation performance of the system.

[0053] like Figure 5 and Figure 6 As shown: The top of the external insulation chamber 41 is also fixedly provided with an inlet pipe 43 that can introduce inert gas into the external insulation chamber 41.

[0054] Inert gases, such as argon or krypton, are introduced into the outer insulation chamber 41 and the inner insulation chamber 42 through the inlet pipe 43. This results in a lower thermal conductivity of the gas within the insulation chamber, further weakening the heat conduction path, reducing the diffusion of steam heat to the outside, and slowing down the temperature decay of the steam. The low thermal conductivity of the inert gas further enhances the insulation effect and improves the steam's temperature retention capacity during storage.

[0055] This invention not only provides comprehensive insulation and protection for steam, but also enables the active removal of condensate.

[0056] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims

1. A heat pump-waste heat recovery steam heating system based on screw compression, characterized in that, include: Base; The ring storage module is vertically mounted on the base. The ring storage module is equipped with an outer storage unit and an inner storage unit for storing steam, as well as an outlet pipe for discharging the condensate from the outer storage unit and the inner storage unit. A flow guiding module is rotatably mounted at the bottom of the base, and the flow guiding module is used to drain the condensate in the external storage unit and the internal storage unit; The heat insulation module is vertically mounted on the base. The ring storage module also includes a first connecting pipe that connects the outer storage unit and the inner storage unit, and a steam inlet pipe and a steam outlet pipe that are respectively fixedly installed on the top of the outer storage unit and the inner storage unit. The internal storage unit is centrally located within the external storage unit; The external storage unit consists of multiple S-shaped bends connected in series end to end; Multiple S-shaped bends are connected in a ring, and each S-shaped bend has a vertically fixed outlet pipe at its bottom that communicates with the inside of the S-shaped bend. The outlet ends of the plurality of outlet tubes all pass vertically through the base and are positioned vertically toward the bottom of the base; The flow guiding module is equipped with a rotary sealing plate that can control the dynamic opening and closing of the outlet end of the outlet tube. The rotary sealing plate is also provided with outlets that correspond one-to-one with the outlet ends of multiple outlet tubes. In the non-drainage state, the outlets provided through the rotary sealing plate are located away from the outlet ends of the outlet tubes. In the drainage state, the outlets provided through the rotary sealing plate are provided to correspond one-to-one with the outlet ends of multiple outlet tubes. The flow guiding module also includes a liquid collection tank for collecting condensate and a servo motor for driving the rotary sealing plate to rotate axially. The liquid collection tank is fixedly installed at the bottom of the base and the coaxial cover is installed outside the rotary sealing plate; The servo motor is vertically fixed at the bottom of the liquid collection tank and its output shaft passes through the liquid collection tank and is fixedly connected to the rotary sealing plate. The insulation module is equipped with an outer insulation chamber and an inner insulation chamber that can respectively enclose the outer storage unit and the inner storage unit in a ring shape. The inner insulation chamber is coaxially arranged inside the outer insulation chamber; The top of the external insulation chamber is also fixedly equipped with an inlet pipe that can introduce inert gas into the external insulation chamber.

2. The heat pump-waste heat recovery steam heating system based on screw compression according to claim 1, characterized in that, The flow guiding module also includes a vibration motor capable of driving the external storage unit and the internal storage unit to oscillate; The vibration motor is centrally mounted on the base.

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