Heat pump steam generating device

Abstract

The utility model discloses a heat pump steam generating device which comprises a heat pump system and a steam system, the steam system is a shell and tube heat exchanger and comprises a barrel, tube plates used for fixing heat exchange tube bundles are arranged at the two ends of the barrel, and the heat exchange tube bundles are erected between the two tube plates at intervals from top to bottom. The tube plate and the inner wall of the barrel body form a tube box communicated with the heat exchange tube bundles, a pass partition plate for dividing a heat medium in the tube box to flow multiple heat exchange tube bundles from top to bottom is arranged in the tube box, a heat medium inlet is formed in the upper end of the tube box on one side, and a heat medium outlet is formed in the lower end of the tube box on one side; a steam outlet is formed in the top of the barrel; and a heat medium pipeline of the heat pump system is communicated with a heat medium inlet of the shell and tube heat exchanger and exchanges heat with the water circulation shell path. The high-temperature heat medium of the heat pump firstly exchanges heat with the water vapor with higher temperature through the pass partition plate, the temperature of the water vapor is further increased, and high-temperature and high-pressure water vapor higher than 150 DEG C can be directly generated without arranging a water vapor gas-liquid separation device and a flash tank.

Description

Technical Field

[0001] This utility model relates to a steam generating device, and more particularly to a heat pump steam generating device. Background Technology

[0002] Industrial production requires large quantities of high-temperature steam, which is mostly obtained through combustion boilers, consuming significant amounts of energy with low energy efficiency and generating waste gas and residue that pollute the environment. Patent document CN118935339A discloses a system that uses a heat pump to absorb heat from low-grade energy sources for heating cold water to obtain steam, reducing high-quality energy consumption while providing both low-pressure steam and high-temperature hot water. Patent document CN219102952U discloses a heat pump steam generator that produces high-temperature, high-pressure steam by using a pressurization pump and a flash tank. However, the steam obtained through the "flash system" is approximately 5°C lower in temperature than the water heated by the heat pump, resulting in a loss of heat pump efficiency. Furthermore, the "flash system" requires heat exchangers, a flash tank, and a pressure reducing valve, making the device complex and resulting in low energy utilization. Utility Model Content

[0003] Purpose of the utility model: The purpose of this utility model is to provide a heat pump steam generator that can directly generate high-temperature and high-pressure steam above 150°C without the need for a flash tank.

[0004] Technical Solution: The heat pump steam generating device of this utility model includes a heat pump system and a steam system. The steam system is a shell-and-tube heat exchanger, including a shell body. Tube sheets for fixing heat exchange tube bundles are provided at both ends of the shell body. Multiple heat exchange tube bundles are installed between two tube sheets from top to bottom at intervals. The heat exchange tube bundles are sealed to the tube sheets. The tube sheets and the inner wall of the shell body form a tube box that communicates with the heat exchange tube bundles. A partition plate is provided inside the tube box to divert the heat medium in the tube box from top to bottom to flow through multiple heat exchange tube bundles. A heat medium inlet is provided at the upper end of one tube box and a heat medium outlet is provided at the lower end. A water inlet is provided at the bottom of the shell body and a steam outlet is provided at the top. The heat medium pipeline of the heat pump system is connected to the heat medium inlet of the shell-and-tube heat exchanger and exchanges heat with the water circulation shell circuit.

[0005] Furthermore, the heat exchange tube bundle is provided in at least two sets, including a first heat exchange tube bundle located in the upper part of the cylinder for heat exchange with water vapor and a second heat exchange tube bundle located in the lower part of the cylinder for heat exchange with water. Multiple layers of the first and second heat exchange tube bundles are arranged in conjunction with a partition plate. By setting the partition plate, the heat medium of the heat pump system first flows through the first heat exchange tube bundle to exchange heat with the high-temperature water vapor in the upper part of the cylinder, further heating the water vapor. Then, it continuously flows back into the second heat exchange tube bundle, layer by layer, to exchange heat with the circulating water below to generate water vapor. Since the temperature required for heating the bottom circulating water to generate water vapor is lower than the temperature required for heating the water vapor, the partition plate eliminates the need for a flash tank. The high-temperature heat medium first contacts the hot water vapor to heat it, further increasing the temperature of the water vapor, directly producing high-temperature, high-pressure water vapor. The temperature of the produced high-temperature, high-pressure water vapor is higher than 150°C. The heat medium, with its gradually decreasing heat, flows downwards to exchange heat with the bottom water circulation system to generate water vapor.

[0006] Furthermore, the cylinder is equipped with a bypass port for controlling the liquid level. When the circulating water flow is large, it flows back to the water circulation system through the bypass port, ensuring the height of the liquid level inside the cylinder so that water vapor can be separated into gas and liquid at the liquid level.

[0007] Furthermore, each heat exchange tube bundle is arranged with at least one row of heat exchange tubes arranged side by side, and each row contains multiple heat exchange tubes. By setting up uniformly and densely distributed heat exchange tubes, the heat medium of the heat pump system is guided to the heat exchange area more evenly, thereby improving the heat exchange efficiency.

[0008] Furthermore, multiple sets of the first and second heat exchange tube bundles can be provided, which can be added according to the output and temperature requirements of steam to further improve the heat exchange efficiency.

[0009] Furthermore, the heat exchange tube bundle is sealed to the tube sheet, ensuring that both sides can independently withstand high pressure while maintaining the separation between the tube side and the shell, preventing the heat medium from mixing into the water circulation system.

[0010] Furthermore, the cylindrical body is made of carbon steel, stainless steel, or titanium alloy.

[0011] Beneficial effects: Compared with the prior art, this utility model has the following advantages: 1. By using a partition plate, the high-temperature heat medium of the heat pump is first exchanged with water vapor at a higher temperature, further increasing the temperature of the water vapor. This eliminates the need for a booster pump and flash tank, directly generating high-temperature, high-pressure water vapor above 150°C; 2. It improves the working efficiency of the heat pump system. The amount of heat medium charged through the pipeline is small, and the water vapor produced by the same amount of heat medium has a higher temperature and greater output, greatly improving energy utilization; 3. The water vapor flows through the shell side, utilizing the shell to achieve gas-liquid separation of the water vapor, while also directly superheating saturated water vapor; 4. The device has a compact structure, small size, and high energy utilization. Attached Figure Description

[0012] Figure 1 This is a cross-sectional view of the structure of this utility model;

[0013] Figure 2 This is a cross-sectional view of the structure of this utility model. Detailed Implementation

[0014] The technical solution of this utility model will be further described below with reference to the accompanying drawings.

[0015] like Figure 1 The illustrated heat pump steam generator includes a heat pump system and a steam system. The steam system is a shell-and-tube heat exchanger, including a shell 6 made of carbon steel, but stainless steel or titanium alloy can also be used. The shell 6 has a water inlet 7 at the bottom, a steam outlet 11 at the top, and a bypass port 12 on the side wall for controlling the liquid level. Left tube sheets 4 and right tube sheets 8 are provided at both ends of the shell 6 to fix heat exchange tube bundles 5. Four sets of heat exchange tube bundles 5 are spaced apart from top to bottom between the left and right tube sheets 4 and 8, passing through them and being sealed to them by welding or expansion. The left and right tube sheets 4 and 8 respectively form a left tube box 10 and a right tube box 9 connected to the heat exchange tube bundles 5 with the inner wall of the shell 6. The left tube box 10 has a heat medium inlet 1 at the upper end and a heat medium outlet 3 at the lower end. The four sets of heat exchange tube bundles 5 include a first heat exchange tube bundle located in the upper part of the shell 6 for heat exchange with water vapor and three sets of second heat exchange tube bundles located in the lower part of the shell 6 for heat exchange with water. The partition plate 2 includes a first partition plate 2-1 and a second partition plate 2-2 located in the left tube box 10. The heat medium in the left tube box 10 is first introduced into the first heat exchange tube bundle in the upper part of the shell 6. The second partition plate 2-2 cooperates with the third partition plate 2-3 in the right tube box 9 to allow the heat medium flowing through the first heat exchange tube bundle to flow from top to bottom through the three sets of second heat exchange tube bundles. The heat medium pipeline of the heat pump system is connected to the heat medium inlet 1 of the shell and tube heat exchanger and exchanges heat with the water circulation shell to generate water vapor.

[0016] like Figure 2As shown, the first heat exchange tube bundle 5-1 has multiple rows of heat exchange tubes arranged side by side, with multiple heat exchange tubes in each row. The three sets of second heat exchange tube bundles 5-2, 5-3, and 5-4 each have multiple rows, with multiple heat exchange tubes in each row (the arrangement in the figure is for illustration only and does not represent the actual number of heat exchange tubes designed). The hottest heat medium enters the left tube box 10 from the heat pump system through the heat medium inlet 1. Under the diversion effect of the first partition plate 2-1, it first flows into the first heat exchange tube bundle 5-1 to exchange heat with the saturated water vapor in the upper part of the cylinder 6, heating it to above 150°C, and then exits through the steam outlet 11 at the top. The heat medium passing through the first heat exchange tube bundle 5-1 flows through three sets of second heat exchange tube bundles 5-2, 5-3, and 5-4 respectively, under the diversion effect of the second partition plate 2-2 and the third partition tube sheet 2-3. It exchanges heat with the water at the bottom of the cylinder 6, heating the preheated water to produce high-temperature saturated steam. The liquid level in the cylinder 6 is controlled by the bypass port 12. Gas-liquid separation occurs above the liquid level, and the steam enters the upper part of the cylinder 6 for further heating. The heat medium returns from the heat medium outlet 3 to the heat pump system for circulation.

[0017] By setting up multi-layered, multi-pass heat exchange tube bundles and multiple heat exchange tubes, the high-temperature heat medium generated by the heat pump system first exchanges heat with high-temperature water vapor, and then continuously flows back layer by layer to exchange heat with the circulating water below to generate water vapor. Since the temperature required for heating the bottom circulating water to generate water vapor is lower than the temperature required for water vapor heating, the multi-pass baffles allow the high-temperature heat medium to first contact the hot water vapor to heat it and further increase the temperature of the water vapor. The heat medium, whose heat gradually decreases, flows downwards to exchange heat with the bottom water circulation system to generate water vapor. With this arrangement, the cylinder 6 is divided into three functional areas: the bottom is the water vapor generation area, the liquid surface is the gas-liquid separation area, and the upper part is the water vapor heating area. There is no need to set up a gas-liquid separation device or a flash tank; high-temperature, high-pressure water vapor is directly generated, and the temperature of the generated high-temperature, high-pressure water vapor exceeds 150℃. In actual production, multiple sets of first and second heat exchange tube bundles can be added to further improve heat exchange efficiency based on the steam output and temperature requirements. Simultaneously, by adjusting the number of layers and tubes, the heat medium can be guided more evenly and densely to the heat exchange area, improving working efficiency and energy utilization. This device has a compact structure, small size, high energy utilization, and requires a small amount of heat medium to fill the pipeline. The same amount of heat medium produces steam with a higher temperature and larger volume. It can be used in conjunction with various heat pump systems such as air source heat pumps, ground source heat pumps (or geothermal heat pumps), water source heat pumps, and heat source tower heat pumps.

Claims

1. A heat pump steam generating apparatus comprising a heat pump system and a steam system, characterized by, The steam system is a shell-and-tube heat exchanger, comprising a cylinder (6), pipe plates for fixing heat exchange tube bundles (5) are arranged at both ends of the cylinder (6), a plurality of heat exchange tube bundles (5) are arranged between the two pipe plates from top to bottom at intervals, the heat exchange tube bundles (5) are sealingly connected with the pipe plates, the pipe plates and the inner wall of the cylinder (6) form a tube box in communication with the heat exchange tube bundles (5), a distribution partition plate (2) for distributing the hot medium in the tube box to flow through the plurality of heat exchange tube bundles (5) from top to bottom is arranged in the tube box, a hot medium inlet (1) is arranged at the upper end of one side of the tube box, and a hot medium outlet (3) is arranged at the lower end; a water inlet (7) is arranged at the bottom of the cylinder (6), and a steam outlet (11) is arranged at the top; the hot medium pipeline of the heat pump system is in communication with the hot medium inlet (1) of the shell-and-tube heat exchanger and exchanges heat with the water circulation shell pipeline.

2. The heat pump steam generating apparatus according to claim 1, wherein The heat exchange tube bundles (5) are arranged in at least two groups, comprising a first heat exchange tube bundle arranged at the upper part of the cylinder (6) for heat exchange with water vapor and a second heat exchange tube bundle arranged at the lower part of the cylinder (6) for heat exchange with water.

3. The heat pump steam generating apparatus according to claim 2, wherein The cylinder (6) is provided with a bypass port (12) for controlling the liquid level.

4. The heat pump steam generating apparatus according to claim 2, wherein Each group of heat exchange tube bundles (5) is provided with at least one row of heat exchange tubes arranged in parallel from top to bottom, and each row of heat exchange tubes is provided with a plurality of heat exchange tubes.

5. The heat pump steam generating apparatus according to claim 2, wherein The first heat exchange tube bundle and the second heat exchange tube bundle are arranged in multiple groups.

6. The heat pump steam generating apparatus according to claim 5, wherein The distribution partition plate (2) is arranged in multiple layers in cooperation with the multiple groups of first heat exchange tube bundles and second heat exchange tube bundles.

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