Boiler phase change type heat exchanger system
By introducing a phase-change heat exchanger system with interlaced multi-layer U-shaped heat exchange tubes in the boiler, the problems of insufficient area of the heat exchanger and accumulation of dust are solved, efficient heat energy utilization and heat exchange are achieved, and the operation efficiency of the boiler is improved.
Patent Information
- Application Number
- CN202421558618.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-03
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-07-03
AI Technical Summary
The economizer heat exchangers of existing industrial boilers have problems such as insufficient heat exchange area, too fast flue gas flow rate and ash accumulation and scaling, resulting in waste of heat energy and reduced heat exchange efficiency.
A boiler phase-change heat exchanger system is designed, including the phase-change heat exchanger body and the drum. It adopts multi-layer U-shaped heat exchange tubes to stagger the formation of a complex heat exchange network, increase the fluid contact area, and connects it through the riser and descending tubes. The U-shaped heat exchange tube is used to exchange heat with the flue gas to achieve efficient heat transfer.
It improves the operating efficiency of the boiler system, reduces energy consumption, enhances heat exchange efficiency, and reduces heat energy waste.
Smart Images
Figure CN223122019U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a boiler phase change heat exchanger system, belonging to the technical field of phase change heat exchangers. Background Art
[0002] In industrial boilers, an economizer is equipped to recover the heat in flue gas to improve the heat exchange efficiency. However, in actual operation, due to problems such as insufficient heat exchange area, too fast flue gas velocity, severe ash accumulation and scaling in the economizer of the boiler, heat energy is wasted and the heat exchange efficiency decreases. Therefore, it is considered to add a heat exchanger at the boiler outlet to further improve the heat exchange effect of the boiler, reduce the flue gas temperature and reduce heat energy waste.
[0003] As a high-efficiency heat exchange device based on the characteristics of phase change materials, the phase change heat exchanger has remarkable heat energy storage and transfer capabilities and can effectively improve the energy utilization efficiency. However, the existing phase change heat exchangers still need to be improved in terms of energy utilization rate, heat exchange efficiency, etc. Summary of the Utility Model
[0004] Aiming at the deficiencies in the background art, the utility model provides a boiler phase change heat exchanger system, which can make the structure of the boiler system more reasonable and the operation efficiency higher, and helps to reduce energy consumption and improve the heat exchange efficiency.
[0005] To solve the above technical problems, the utility model adopts the following technical solutions:
[0006] A boiler phase change heat exchanger system includes a phase change heat exchanger body and a phase change heat exchanger steam drum, and the phase change heat exchanger body and the phase change heat exchanger steam drum are connected and communicated through riser pipes and downcomer pipes;
[0007] The phase change heat exchanger body further includes a heat exchange tube group, and the heat exchange tube group includes a plurality of heat exchange tube units arranged along the flue gas flow direction. Each heat exchange tube unit includes multiple layers of U-shaped heat exchange tubes, and the upper and lower adjacent layers of U-shaped heat exchange tubes are arranged in a front-back staggered manner.
[0008] Further, the phase change heat exchanger body includes a flue gas passage that penetrates through the front and back. The front end of the flue gas passage is a flue gas inlet, and the rear end of the flue gas passage is a flue gas outlet.
[0009] Further, the heat exchange tube unit further includes a first main riser pipe and a second main riser pipe. The first main riser pipe is connected to the outlet of the U-shaped heat exchange tube, and the second main riser pipe is connected to the inlet of the U-shaped heat exchange tube.
[0010] Further, the axis of the U-shaped heat exchange tube is perpendicular to the transmission direction of the flue gas.
[0011] Further, the upper end of the riser pipe is connected to the steam drum of the phase change heat exchanger, the lower end of the riser pipe is connected to the main riser pipe, the upper end of the downcomer is connected to the steam drum of the phase change heat exchanger, and the lower end of the downcomer is connected to the main riser pipe.
[0012] Further, the steam drum of the phase change heat exchanger includes a water inlet, a water outlet, a pressure gauge and a safety bursting port.
[0013] Further, a dust hopper is provided at the lower end of the phase change heat exchanger body. The dust hopper is arranged at the bottom of the phase change heat exchanger body and is sealed by a blind plate structure.
[0014] Further, temperature sensors are respectively provided at the flue gas inlet and the flue gas outlet.
[0015] After the present utility model adopts the above technical solutions, compared with the prior art, it has the following advantages:
[0016] The heat exchange tube group includes a plurality of heat exchange tube units. Each heat exchange tube unit includes multiple layers of U-shaped heat exchange tubes. The upper and lower adjacent layers of U-shaped heat exchange tubes are arranged in a front-back staggered manner. The U-shaped heat exchange tubes are designed with smooth tube structures and are horizontally placed. Each flow channel is composed of a plurality of slender heat exchange tubes. The adjacent two layers of U-shaped heat exchange tubes are arranged in a staggered manner to form a complex heat exchange network. This design can greatly increase the contact area between the fluid and the U-shaped heat exchange tubes, thereby reducing energy consumption and improving the heat exchange efficiency.
[0017] The present utility model will be described in detail below with reference to the accompanying drawings and embodiments. Description of the Drawings
[0018] Figure 1 is the front view of the present utility model;
[0019] Figure 2 is the side view of the present utility model;
[0020] Figure 3 is the top view of the phase change heat exchanger body in the present utility model;
[0021] Figure 4 is the top view of a heat dissipation unit in the present utility model.
[0022] In the figure,
[0023] 1 - dust hopper, 2 - phase change heat exchanger body, 3 - flue gas inlet, 4 - steam drum fixing bracket, 5 - steam drum of the phase change heat exchanger, 6 - riser pipe, 7 - downcomer, 8 - flue gas outlet, 9 - U-shaped heat exchange tube, 10 - first main riser pipe, 11 - second main riser pipe, A - heat dissipation unit. Detailed Embodiments
[0024] For a clearer understanding of the technical features, objectives, and effects of the present utility model, the specific embodiments of the present utility model will now be described with reference to the accompanying drawings.
[0025] As Figures 1-3 shown, the present utility model provides a boiler phase-change heat exchanger system, which includes a phase-change heat exchanger body 2 and a phase-change heat exchanger steam drum 5. The phase-change heat exchanger steam drum 5 is fixed on the upper surface of the phase-change heat exchanger body 2 through a steam drum fixing bracket 4. The phase-change heat exchanger body 2 and the phase-change heat exchanger steam drum 5 are connected and communicated through a riser 6 and a downcomer 7.
[0026] The phase-change heat exchanger body 2 includes a flue gas passage that runs through from front to back. The front end of the flue gas passage is a flue gas inlet 3, and the rear end of the flue gas passage is a flue gas outlet 8. The flue gas inlet 3 is connected to the boiler to collect the flue gas generated at the boiler outlet.
[0027] The phase-change heat exchanger body 2 further includes a heat exchange tube group. The heat exchange tube group includes a plurality of heat exchange tube units A arranged along the flue gas flow direction. Each heat exchange tube unit A includes multiple layers of U-shaped heat exchange tubes 9. As Figure 4 shown, the upper and lower adjacent layers of U-shaped heat exchange tubes 9 are arranged in a front-back staggered manner.
[0028] The heat exchange tube unit A further includes a first main riser 10 and a second main riser 11. The first main riser 10 is connected to the outlet of the U-shaped heat exchange tube 9, and the second main riser 11 is connected to the inlet of the U-shaped heat exchange tube 9. The inlets and outlets of each layer of U-shaped heat exchange tubes 9 are connected and communicated with the main riser.
[0029] The tube axis of the U-shaped heat exchange tube 9 is arranged perpendicular to the transmission direction of the flue gas. The U-shaped heat exchange tube 9 adopts a smooth tube structure design and is horizontally placed. Each flow channel is composed of a plurality of slender heat exchange tubes. The heat exchange tubes are made of materials with high thermal conductivity to ensure good heat conduction performance. The adjacent two layers of U-shaped heat exchange tubes 9 are arranged in a staggered manner to form a complex heat exchange network. This design can greatly increase the contact area between the fluid and the U-shaped heat exchange tube 9, thereby improving the heat exchange efficiency.
[0030] The upper end of the riser 6 is connected and communicated with the phase-change heat exchanger steam drum 5, and the lower end of the riser 6 is connected and communicated with the first main riser 10. The upper end of the downcomer 7 is connected and communicated with the phase-change heat exchanger steam drum 5, and the lower end of the downcomer 7 is connected and communicated with the second main riser 11. The first main riser 10 connected to the outlet of the U-shaped heat exchange tube 9 supplies saturated steam to the phase-change heat exchanger steam drum 5 through the riser 6. The cooling water in the phase-change heat exchanger steam drum 5 flows back to the U-shaped heat exchange tube 9 from the second main riser 11 connected to the inlet of the U-shaped heat exchange tube 9 through the downcomer 7.
[0031] The steam drum 5 of the phase change heat exchanger includes a water inlet 501 and a water outlet 502. During the heat exchange process, the water inlet 501 supplies cold water or low-temperature working medium into the steam drum 5 of the phase change heat exchanger, while the hot water or high-temperature working medium is discharged from the water outlet 502 to complete the heat exchange.
[0032] The steam drum 5 of the phase change heat exchanger further includes a pressure gauge 503 and a safety rupture port 504. During the operation of the equipment, the pressure gauge 503 continuously monitors the internal pressure of the steam drum 5 of the phase change heat exchanger. If the internal pressure of the steam drum 5 of the phase change heat exchanger exceeds the set value, the safety rupture port 504 will automatically open to release the pressure.
[0033] Temperature sensors (not shown in the figure) are also respectively provided at the flue gas inlet 3 and the flue gas outlet 8 for monitoring the temperature of the flue gas entering and leaving the phase change heat exchanger body 2.
[0034] A dust hopper 1 is further provided at the lower end of the phase change heat exchanger body 2. The dust hopper 1 is arranged at the bottom of the phase change heat exchanger body 2, and the sealing structure of the dust hopper 1 adopts a blind plate structure for sealing.
[0035] The specific working principle of the present utility model:
[0036] The present utility model includes a phase change heat exchanger body 2 and a steam drum 5 of the phase change heat exchanger. The phase change heat exchanger body 2 and the steam drum 5 of the phase change heat exchanger are connected and communicated through a riser 6 and a downcomer 7. The phase change heat exchanger body 2 further includes a heat exchange tube group. The heat exchange tube group includes a plurality of heat exchange tube units A. Each heat exchange tube unit A includes multiple layers of U-shaped heat exchange tubes 9. The upper and lower adjacent layers of U-shaped heat exchange tubes 9 are arranged in a front-back staggered manner. The U-shaped heat exchange tubes 9 are designed with a smooth tube structure and are horizontally placed. Each flow channel is composed of a plurality of slender heat exchange tubes. The adjacent layers of U-shaped heat exchange tubes 9 are arranged in a staggered manner to form a complex heat exchange network. This design can greatly increase the contact area between the fluid and the U-shaped heat exchange tubes 9, thereby reducing energy consumption and improving the heat exchange efficiency.
[0037] The first main riser 10 connected to the outlet of the U-shaped heat exchange tube 9 supplies saturated steam into the steam drum 5 of the phase change heat exchanger through the riser 6. The cooling water in the steam drum 5 of the phase change heat exchanger flows back to the U-shaped heat exchange tube 9 through the downcomer 7 from the second main riser 11 connected to the inlet of the U-shaped heat exchange tube 9.
[0038] The U-shaped heat exchange tubes 9 are horizontally inserted into the flue gas channel. The U-shaped heat exchange tubes 9 exchange heat with the flue gas. The demineralized water in the U-shaped heat exchange tubes 9 of the phase change heat exchanger body 2 absorbs the waste heat of the boiler flue gas and vaporizes into saturated steam. The saturated steam rises through the riser 6 to the steam drum 5 of the phase change heat exchanger under a certain pressure difference, releases heat to the outside (boiler feed water) and condenses into saturated water. The saturated water flows back to the phase change heat exchanger body 2 along the downcomer 7 and is heated and vaporized by the flue gas again, and the cycle repeats.
[0039] The above is an example of the best implementation mode of the present utility model, and the parts not described in detail are all common general knowledge in the art. The protection scope of the present utility model shall be subject to the content of the claims, and any equivalent transformation based on the technical inspiration of the present utility model shall also be within the protection scope of the present utility model.
Claims
1. A boiler phase change heat exchanger system, characterized in that: It includes a phase change heat exchanger body (2) and a phase change heat exchanger steam drum (5), and the phase change heat exchanger body (2) and the phase change heat exchanger steam drum (5) are connected through a riser pipe (6) and a downcomer pipe (7). The phase change heat exchanger body (2) further includes a heat exchange tube group, and the heat exchange tube group includes a plurality of heat exchange tube units (A) arranged along the flue gas flow direction. Each heat exchange tube unit (A) includes multiple layers of U-shaped heat exchange tubes (9), and the two adjacent upper and lower layers of U-shaped heat exchange tubes (9) are arranged in a front-back staggered manner.
2. The phase change heat exchanger system of a boiler according to claim 1, characterized in that: The phase change heat exchanger body (2) includes a flue gas passage that penetrates from front to back. The front end of the flue gas passage is a flue gas inlet (3), and the rear end of the flue gas passage is a flue gas outlet (8).
3. The phase change type heat exchanger system for a boiler according to claim 1, characterized in that: The heat exchange tube unit (A) further includes a first main riser pipe (10) and a second main riser pipe (11). The first main riser pipe (10) is connected to the outlet of the U-shaped heat exchange tube (9), and the second main riser pipe (11) is connected to the inlet of the U-shaped heat exchange tube (9).
4. The phase-change heat exchanger system of a boiler according to claim 3, characterized in that: The tube axis of the U-shaped heat exchange tube (9) is perpendicular to the transmission direction of the flue gas.
5. The phase-change heat exchanger system of a boiler according to claim 3, wherein: The upper end of the riser pipe (6) is connected to the phase change heat exchanger steam drum (5), and the lower end of the riser pipe (6) is connected to the main riser pipe (10). The upper end of the downcomer pipe (7) is connected to the phase change heat exchanger steam drum (5), and the lower end of the downcomer pipe (7) is connected to the main riser pipe (10).
6. The phase-change heat exchanger system for a boiler according to claim 1, wherein: The phase change heat exchanger steam drum (5) includes a water inlet (501), a water outlet (502), a pressure gauge (503), and a safety rupture port (504).
7. The phase-change heat exchanger system of a boiler according to claim 1, wherein: A dust hopper (1) is further provided at the lower end of the phase change heat exchanger body (2). The dust hopper (1) is arranged at the bottom of the phase change heat exchanger body (2), and the dust hopper (1) is sealed by a blind plate structure.
8. The phase-change heat exchanger system of a boiler according to claim 1, characterized in that: Temperature sensors are respectively provided at the flue gas inlet (3) and the flue gas outlet (8).