A glass kiln waste heat recovery and drying room heating water quality isolation plate heat exchanger

Abstract

The application discloses a glass kiln waste heat recovery and drying room heating water quality isolation plate heat exchanger device, and belongs to the technical field of plate heat exchangers, which comprises a heat pipe, one end of which is connected with water outlets of multiple glass kilns; a plate heat exchange assembly, one side of which is provided with a hot water inlet, the other end of the heat pipe is connected with the hot water inlet; a hot water outlet, which is arranged below the hot water inlet on the plate heat exchange assembly; a cold pipe, one end of which is connected with a workshop drying room water tank, one side of the plate heat exchange assembly, which is located at the hot water inlet, is provided with a cold water inlet, the other end of the cold pipe is connected with the cold water inlet; a cold water outlet, which is located below the cold water inlet; and a flow dividing device, which is arranged on the plate heat exchange assembly and located at the hot water inlet. In the application, three-grade heat exchange switching can be realized, so that the flow fluctuation existing in the intermittent work of multiple glass kilns can be self-adapted, and efficient heat exchange can be realized.

Description

Technical Field

[0001] This invention belongs to the technical field of plate heat exchangers, specifically a plate heat exchange device for waste heat recovery from glass kilns and for isolating the hot water supply quality of drying rooms. Background Technology

[0002] Glass furnaces are core thermal equipment in the glass manufacturing industry, requiring temperatures above 1500℃ for the melting process. To ensure the structural safety of the furnace, a water-cooled circulation system is typically used for forced cooling of critical components such as the furnace walls, electrodes, and tank walls. Currently, most glass manufacturers still treat the furnace cooling water by simply exchanging heat and then directly discharging it into a large outdoor water tank (e.g., 500m³) for natural cooling. This process not only wastes a significant amount of heat energy but also exacerbates thermal pollution. Meanwhile, the drying chamber heating system operates independently, relying on electrically driven heat pumps to maintain temperature, resulting in high energy costs and significant carbon emissions. Therefore, recovering waste heat from the furnace and using it for drying chamber heating has significant potential for energy conservation and emission reduction.

[0003] However, this recovery scheme faces several problems in actual engineering. First, glass kilns operate intermittently, with cooling time lasting only a few hours per day, and the start-up and shutdown times of each kiln are random, resulting in significant fluctuations in waste heat flow. Traditional constant-parameter heat exchange equipment struggles to adapt to these drastic fluctuations, easily leading to a sharp drop in heat transfer coefficient and substandard outlet water temperature at low flow rates. Second, the kiln cooling water contains trace amounts of metal ions, suspended solids, and scale. If directly introduced into the drying chamber's end (such as air-cooled radiators), it can cause pipe scaling, blockage, corrosion, and leaks, severely impacting system lifespan and heating reliability. Furthermore, while existing heat exchange devices, such as plate heat exchangers, have high heat transfer efficiency, their internal flow channels are single and fixed, unable to actively adjust the effective heat exchange area based on real-time heat source flow. This results in unstable heat recovery rates under intermittent operating conditions, and the constant cold-side fluid velocity makes it difficult to extend the heat exchange residence time to ensure the outlet temperature when the heat source is insufficient.

[0004] Therefore, it is necessary to provide a heat exchanger with a heat recovery system for waste heat recovery in glass kilns and a heat supply system for drying rooms, in order to solve the problems mentioned in the background art. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides the following technical solution: a plate heat exchanger for waste heat recovery from glass kilns and hot water quality isolation in drying rooms, comprising: a heat pipe, one end of which is connected to the outlet of multiple glass kilns; a plate heat exchanger assembly, one side of which is provided with a hot water inlet, and the other end of the heat pipe is connected to the hot water inlet; a hot water outlet, disposed on the plate heat exchanger assembly below the hot water inlet; a cold pipe, one end of which is connected to the water tank of the drying room, and the plate heat exchanger assembly is provided with a cold water inlet on the side of which is the hot water inlet, and the other end of the cold pipe is connected to the cold water inlet; a cold water outlet, located below the cold water inlet; and a diversion device, disposed on the plate heat exchanger assembly and located at the hot water inlet.

[0006] Preferably, a delivery pipe is connected to the outside of the cold water outlet, and the other end of the delivery pipe is connected to the air-cooled radiator.

[0007] Preferably, the plate heat exchanger assembly includes: a frame plate with two guide rods arranged parallel above and below it, one end of each guide rod being fixed to the frame plate; a clamping plate arranged parallel to one side of the frame plate; multiple connecting screws, each with its two ends passing through and connected to the frame plate and the clamping plate respectively, and an adjusting nut threaded onto the connecting screw; a support frame fixed to the end of the guide rod away from the frame plate; and multiple heat exchange plates arranged parallel to each other, each heat exchange plate being closely distributed between the frame plate and the clamping plate.

[0008] Preferably, the heat exchange plate has a heat exchange groove on its surface, and a guide flange is provided inside the heat exchange groove; and each of the four corners of the heat exchange plate has an opening; and the two openings on the left side of the heat exchange plate at odd-numbered positions have holes and grooves on their sidewalls, forming a heat conduction channel; the two openings on the right side of the heat exchange plate at even-numbered positions have holes and grooves on their sidewalls, forming a cold water channel; the openings are connected to the heat exchange grooves through the holes and grooves.

[0009] Preferably, the heat exchange plate is also provided with an inner through hole, and the side wall of the inner through hole is also provided with a slot that communicates with the heat exchange groove, forming an inner channel; the heat exchange plate in the odd-numbered position is provided with inclined inner dividing ribs, which divide the heat exchange groove into a first heat flow cavity and a second heat flow cavity. The inner through hole communicates with the first heat flow cavity, and both the first heat flow cavity and the second heat flow cavity communicate with the opening on the lower left side.

[0010] Preferably, the second heat flow cavity has an inverted triangular structure.

[0011] Preferably, the diversion device includes: a Y-shaped tube, one end of which is sealed and connected to the heat pipe; two fixed tubes, each connected to the Y-shaped tube, the other end of each fixed tube passing through the frame plate and connected to the heat conduction channel and the inner channel above; a valve body, fixed inside the Y-shaped tube, with valve holes respectively opened at the top and bottom of the valve body; a valve seat, fixed to the valve body, with a valve stem slidably connected inside the valve seat, and valve plugs fixed at both ends of the valve stem; and an electromagnetic drive device, fixed inside the valve seat, for driving the valve stem to slide up and down.

[0012] Preferably, the length of the valve stem is less than the length between the two valve holes.

[0013] Preferably, a connecting pipe is fixed in the upper cold water channel, and multiple guide holes are provided on the side wall of the connecting pipe; and a positioning pipe is rotatably connected inside the connecting pipe, and a first connecting hole group and a second connecting hole group are provided on the positioning pipe.

[0014] Preferably, the first connecting hole group and the second connecting hole group are configured as an arc-shaped structure and are staggered between each other, with a partially overlapping area between the first connecting hole group and the second connecting hole group; a swing drive device is provided outside the clamping plate, and the output end of the swing drive device is connected to the positioning tube.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] In this invention, the hot side of the heat exchange plate is divided into a first heat flow chamber and a second heat flow chamber by separating the inner ribs. With the three-level switching of the flow diversion device, it can adapt to the drastic flow fluctuations caused by the intermittent operation of multiple glass furnaces and achieve efficient heat exchange. Among them, the furnace cooling water and the drying room circulating water only flow on both sides of the metal plate, and the two water paths are not interconnected, which greatly extends the service life of the equipment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 This is the front view of the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of the odd-numbered heat exchange plates in this invention;

[0020] Figure 4 This is a schematic diagram of the flow diversion device in this invention;

[0021] Figure 5 This is a schematic diagram of the installation structure of the connecting pipe in this invention;

[0022] Figure 6This is a schematic diagram of the positioning tube in this invention;

[0023] In the diagram: 1. Heat pipe; 11. Cold pipe; 12. Delivery pipe; 2. Plate heat exchanger assembly; 21. Frame plate; 22. Guide rod; 23. Pressing plate; 24. Connecting screw; 25. Support frame; 3. Diverter; 31. Y-shaped tube; 32. Fixed tube; 33. Valve body; 34. Valve hole; 35. Valve stem; 36. Valve plug; 4. Heat exchange plate; 41. Through port; 42. Groove; 43. Internal through hole; 44. Inner partition rib; 45. First heat flow chamber; 46. Second heat flow chamber; 5. Connecting pipe; 51. Guide hole; 52. Positioning pipe; 53. First connecting hole group; 54. Second connecting hole group. Detailed Implementation

[0024] Please see Figures 1-6 In this embodiment of the invention, a plate heat exchanger for waste heat recovery from glass kilns and hot water quality isolation in drying rooms includes: a heat pipe 1, one end of which is connected to the outlet of multiple glass kilns; wherein four glass kilns are set on the glass kiln side to operate intermittently, and the internal temperature is extremely high after the kilns are started, with boiling water flowing out; the heat pipe 1 is used to collect the high-temperature hot water intermittently discharged from each kiln; a plate heat exchanger assembly 2, one side of which is provided with a hot water inlet, and the other end of the heat pipe 1 is connected to the hot water inlet; hot water discharge... A hot water outlet is located below the hot water inlet on the plate heat exchanger 2, and this hot water outlet is connected to a 500m³ water tank (natural cooling tank); a cold pipe 11 is connected at one end to the workshop drying room water tank, and a cold water inlet is provided on the side of the hot water inlet on the plate heat exchanger 2, and the other end of the cold pipe 11 is connected to the cold water inlet; that is, the low temperature water (about 20℃~30℃) in the workshop drying room water tank is led out through the cold pipe 11 and connected to the cold water inlet on the plate heat exchanger 2.

[0025] The cold water outlet is located below the cold water inlet; the diversion device 3 is installed on the plate heat exchanger assembly 2 and located at the hot water inlet. The four kilns discharge high-temperature cooling water (temperature close to boiling, approximately 90℃~98℃) within about two hours of start-up. The workshop drying room needs to be maintained at a constant temperature of around 45℃ year-round. The existing waste heat recovery system from the air compressor and the air source heat pump system are extremely power-intensive. This device bypasses the kiln outlet water main (located before the four kilns flow into the outdoor 500m³ natural cooling water pool) via heat pipe 1. This heat extraction method does not interfere with the main cooling water circuit of the kilns and can be immediately shut off in case of any extreme failure, ensuring the safety of kiln cooling.

[0026] In this embodiment, a conveying pipe 12 is connected to the outside of the cold water outlet. The other end of the conveying pipe 12 is connected to the air-cooled radiator. The high-temperature water heated by the plate heat exchanger is pumped into the eight air-cooled radiators in the drying room to achieve heat preservation of the drying room.

[0027] In a preferred embodiment, the plate heat exchanger assembly 2 includes: a frame plate 21 with two guide rods 22 arranged parallel above and below it, one end of each guide rod 22 being fixed to the frame plate 21; a pressing plate 23 arranged parallel to one side of the frame plate 21, the guide rods 22 not only supporting subsequent components but also serving as sliding guide tracks for the pressing plate 23, ensuring that the pressing plate 23 can move in a straight line during the pressing process and avoiding skewing; and multiple connecting screws 24, each with its two ends connected through the frame plate 21 and the pressing plate 23, with adjusting nuts threaded onto the connecting screws 24; the operator can drive the pressing plate 23 to move along the guide rods 22 toward the frame plate 21 by tightening the adjusting nuts, thereby pressing the multi-layer heat exchanger plates 4. This allows for adjustment of the pressing force at any time according to actual working conditions (such as thermal expansion and contraction of the rubber gasket caused by changes in the temperature of the hot fluid), ensuring the sealing between each layer of heat exchanger plates 4.

[0028] A support frame 25 is fixed to the end of the guide rod 22 away from the frame plate 21. The support frame 25 provides auxiliary support to the free end of the guide rod 22 during the disassembly or installation of the heat exchange plate 4, preventing the guide rod 22 from sagging and deforming due to gravity. Multiple heat exchange plates 4 are arranged in parallel, closely distributed between the frame plate 21 and the pressure plate 23. In this embodiment, to meet the heat storage requirements of four kilns and the 45°C insulation requirement of the drying chamber, the number of heat exchange plates 4 is preferably 80-120. Each heat exchange plate 4 is closely distributed between the frame plate 21 and the pressure plate 23, and rubber sealing gaskets are provided between adjacent heat exchange plates 4 to achieve interlayer sealing.

[0029] In this embodiment, the heat exchange plate 4 is provided with a heat exchange groove on its surface, and a flow guide protrusion is provided in the heat exchange groove to guide the fluid to flow along a specific path and generate local turbulence when the fluid flows through the protrusion, which greatly improves the heat transfer coefficient; and an opening 41 is provided at each of the four corners of the heat exchange plate 4.

[0030] Furthermore, the two openings on the left side walls of the heat exchange plates 4 located in odd-numbered positions (e.g., the 1st, 3rd, 5th... plates) are provided with slots 42, which form heat conduction channels. That is, the high-temperature hot water in the kiln flows in through the upper left opening 41, enters the heat exchange tank through the slots 42, exchanges heat with the adjacent plates, and then flows out through the lower left opening 41, returning to the 500m³ water tank or entering the next cycle.

[0031] The heat exchange plates 4 located at even-numbered positions (e.g., the 2nd, 4th, 6th... plates) have two openings 41 on the upper and lower right sides, each with a groove 42, forming a cold water channel. That is, the low-temperature cold water in the workshop drying room water tank flows in through the upper right opening 41, enters the heat exchange tank through the groove 42, absorbs heat, and then flows out from the lower right opening 41.

[0032] The opening 41 is connected to the heat exchange tank via the slot 42. Through the staggered arrangement of odd and even plates on the heat exchange plate 4, high-temperature hot water and low-temperature cold water flow between adjacent plates, and heat is conducted through the metal plates, while the two types of water are physically completely isolated. This protects the eight air-cooled radiators at the end of the drying chamber, preventing scale buildup on the finned tubes and significantly extending the lifespan of the terminal equipment, thus reducing the frequency of cleaning and maintenance. Furthermore, it ensures the purity of the process water in the drying chamber, preventing water pollution from affecting the drying quality of the products.

[0033] In this embodiment, the heat exchange plate 4 is also provided with an inner through hole 43. The side wall of the inner through hole 43 is also provided with a slot 42 that communicates with the heat exchange tank and forms an inner channel. The inner channel serves as an auxiliary inlet for the hot side fluid, corresponding to the second water supply from the diversion device 3. The heat exchange plate 4 in the odd-numbered position is provided with an inclined inner rib 44, which divides the heat exchange tank into a first hot flow chamber 45 and a second hot flow chamber 46. The inner through hole 43 communicates with the first hot flow chamber 45, and both the first hot flow chamber 45 and the second hot flow chamber 46 are connected to the opening 41 on the lower left side. That is, the first hot flow chamber 45 and the second hot flow chamber 46 converge on the outlet side, but are independently supplied with liquid by different inlets (the upper left corner opening 41 and the inner through hole 43) on the inlet side.

[0034] In this embodiment, the second heat flow cavity 46 has an inverted triangular structure (i.e., a larger width at the top and a smaller width at the bottom). The first heat flow cavity 45 naturally forms an equilateral triangular structure (a smaller width at the top and a larger width at the bottom). The inverted triangular structure of the second heat flow cavity 46 has a smaller bottom width. When fluid flows through it, the flow velocity in the bottom region is significantly increased at the same volumetric flow rate, thereby enhancing the local turbulence intensity.

[0035] The significance of this design is that when only 1-2 kilns are operating, the flow rate inside heat pipe 1 is only 20%-40% of the design value. If the entire channel is still used, the hot water flow velocity is extremely low, which easily leads to laminar flow and a sharp drop in the heat transfer coefficient. At this time, introducing a small amount of hot water into the inverted triangular second heat flow chamber 46 causes the cross-sectional area of ​​the hot water to decrease sharply when it flows through the narrow bottom section, significantly increasing the flow velocity. Even under low flow conditions, it can maintain a high heat transfer efficiency and ensure that the outlet water temperature remains stable above 45℃.

[0036] In addition, in traditional heat exchangers, the flow velocity at the bottom of the plates is extremely low at low flow rates, making it easy for impurities to deposit and form dead zones and scale, increasing thermal resistance. The inverted triangular structure of this device has the smallest bottom width, and the fluid maintains a high flow velocity at the bottom, creating a continuous scouring and shearing force on the plate surface. This effectively removes deposits from the heat exchange surface and significantly extends the cleaning cycle of the heat exchange plate 4.

[0037] The cross-sectional area of ​​the first hot flow chamber 45 gradually increases from top to bottom, resulting in relatively low fluid resistance. This makes it suitable for high-flow, high-load conditions (when two or more kilns are fully operational), where the total heat source flow rate is approximately 50% to 75% of the design value. If both chambers are opened simultaneously, the flow velocity will be excessively distributed, leading to excessively low velocities on both sides and insufficient turbulence intensity. If only the inverted triangle-shaped second hot flow chamber 46 is opened, although the flow velocity can be increased, the flow resistance will rise sharply, causing a surge in pump energy consumption and potential overpressure. Opening only the equilateral triangle-shaped first hot flow chamber 45 is a compromise between the two options, ensuring smooth hot water flow and keeping the pressure drop within a reasonable range. Furthermore, at the moment when all four glass kilns are started, when the high-temperature water flow rate reaches the design peak, the first hot flow chamber 45 and the second hot flow chamber 46 open simultaneously. This allows the plate heat exchanger to operate at maximum thermal power, greatly improving the heat capture rate per unit time. This ensures that the "near-boiling" high-temperature water at the moment of start-up is sufficiently cooled after passing through the heat exchange plate 4, significantly improving the waste heat recovery rate.

[0038] See Figure 5 In a preferred embodiment, the diversion device 3 includes: a Y-shaped tube 31, one end of which is sealed and connected to the heat pipe 1 for receiving hot water from the kiln; two fixed tubes 32, each connected to the Y-shaped tube 31, the other end of each fixed tube 32 passing through the frame plate 21 and connected to the heat conduction channel and the inner channel above; a valve body 33, fixed inside the Y-shaped tube 31, with valve holes 34 opened at the top and bottom of the valve body 33; a valve seat, fixed to the valve body 33, with a valve stem 35 slidably connected inside the valve seat, and valve plugs 36 fixed at both ends of the valve stem 35; and an electromagnetic drive device (preferably a proportional electromagnet), fixed inside the valve seat for driving the valve stem 35 to slide up and down.

[0039] In this embodiment, the length of the valve stem 35 is less than the length between the two valve holes 34. When the electromagnetic drive device drives the valve stem 35 to the middle position, neither the upper nor lower valve plugs 36 block the corresponding valve holes 34. At this time, the hot water in the Y-shaped tube 31 simultaneously passes through the upper and lower valve holes 34, entering the upper heat conduction channel and the inner channel respectively, achieving high-flow-rate full-channel heat exchange. When the electromagnetic drive device drives the valve stem 35 to the limit position, the upper valve plug 36 blocks the upper valve hole 34, and the lower valve plug 36 disengages from the lower valve hole 34. At this time, the hot water can only enter the inner channel through the lower valve hole 34 (i.e., only supplying liquid to the first heat flow chamber 45). Similarly, when the valve stem 35 is driven to move downward, only the upper valve hole 34 can be opened (i.e., only supplying liquid to the second heat flow chamber 46).

[0040] Specifically, the system control center uses an industrial-grade PLC to collect core temperature points in real time: the temperature of the kiln outlet water main and the temperature of the drying chamber water tank. Based on this, it automatically switches between three operating modes. Mode 1, rapid waste heat collection, determines that rapid waste heat capture is needed when the temperature of the kiln outlet water main exceeds a set threshold. At this time, the electromagnetic drive device does not operate, the valve stem 35 is in the neutral position, and the upper and lower valve holes 34 are fully open. Hot water enters the first hot flow chamber 45 through the upper left corner port 41 and the inner through hole 43 (entering the second hot flow chamber 46), respectively. Both hot flow chambers participate in heat exchange simultaneously, maximizing the heat exchange area and minimizing flow resistance, which can quickly heat the water in the drying chamber water tank to the target temperature, completing the rapid capture and storage of heat from the start-up peak.

[0041] Mode 2, medium flow heat exchange: When 2-3 kilns are in operation, the PLC controls the electromagnetic drive device to drive the valve stem 35 to move upward, selectively opening only the lower valve hole 34, and hot water is concentrated and introduced into the first hot flow chamber 45, ensuring that sufficient turbulent heat exchange is maintained under medium flow conditions, the flow channel is smooth and wide, and the hot water flow resistance is extremely small.

[0042] Mode 3: Low-flow precision heat exchange. When only one or two kilns are operating, the residual heat flow in heat pipe 1 decreases sharply. At this time, the PLC-controlled electromagnetic drive device moves the valve stem 35 downward, selectively opening only the upper valve orifice 34. A small amount of hot water flows into the inverted triangular cavity, where it is compressed and accelerated at the bottom, forming a local high-speed jet. This effectively scours the plate wall, disrupts the laminar sublayer, maintains a high heat transfer coefficient, and ensures that the drying chamber water tank can still obtain sufficient heat even with a low heat source supply.

[0043] Once the temperature of the drying chamber water tank reaches the set value of 45℃, the PLC automatically shuts off the circulating water pump of the plate heat exchanger, stopping heat transfer. When the kiln is shut down for a long time, resulting in low heat, the original air source heat pump and air compressor waste heat system are automatically activated to continue providing heat to the drying chamber water tank, ensuring uninterrupted heat preservation of the drying chamber.

[0044] In this embodiment, a connecting pipe 5 is fixed in the upper cold water channel, and a plurality of guide holes 51 are provided on the side wall of the connecting pipe 5; and a positioning pipe 52 is rotatably connected inside the connecting pipe 5, and a first connecting hole group 53 and a second connecting hole group 54 are provided on the positioning pipe 52.

[0045] In this embodiment, the first connecting hole group 53 and the second connecting hole group 54 are configured as an arc-shaped structure (i.e., a waist-shaped hole group extending along the circumference of the positioning tube 52) and are staggered between each other. The first connecting hole group 53 and the second connecting hole group 54 have a partially overlapping area. When the positioning tube 52 rotates, there is an angle that allows the first connecting hole group 53 to communicate with a portion of the guide holes 51, and the second connecting hole group 54 to communicate with another portion of the guide holes 51. When the positioning tube 52 swings to a specific angle, the first connecting hole group 53 and the second connecting hole group 54 will simultaneously or alternately cover different areas of the guide holes 51.

[0046] The clamping plate 23 is equipped with a swing drive device (preferably a servo motor combined with a crank rocker mechanism), and the output end of the swing drive device is connected to the positioning tube 52. Under full flow conditions (mode one), the swing drive device drives the positioning tube 52 to rotate to a preset "full-through angle". At this angle, the first connecting hole group 53 and the second connecting hole group 54 overlap with all the guide holes 51 on the connecting tube 5, and low-temperature cold water flows in through the inside of the positioning tube 52 and is evenly distributed to the cold water channels of each even-numbered heat exchange plate 4 through each guide hole 51. The cold water flows quickly through each heat exchange chamber, achieving efficient convective heat transfer.

[0047] Under low flow conditions (modes two and three), the heat supplied by the heating side is limited because only the second heat flow chamber 46 (inverted triangular chamber) is used for heat exchange. If the cold water continues to flow rapidly, the cold water temperature rise will be insufficient to reach the 45°C required by the drying chamber. At this time, the PLC controls the swing drive device to drive the positioning tube 52 to swing back and forth with a small amplitude.

[0048] During the oscillation process, the first connecting hole group 53 and the second connecting hole group 54 alternately overlap and offset with the guide holes 51 in different areas. Specifically, within one oscillation cycle, when the positioning tube 52 oscillates to a certain angle, the first connecting hole group 53 overlaps with the guide holes 51 of the corresponding front half of the heat exchange plate 4, while the second connecting hole group 54 offsets from the guide holes 51 of the rear half of the heat exchange plate 4. This allows cold water to preferentially enter the cavity of the front half of the heat exchange plate 4, while the cold water in the rear half of the cavity cannot continue to flow downwards because the outlet is blocked, and temporarily remains in the heat exchange cavity.

[0049] During the residence period, the cold water in this section undergoes sufficient and prolonged static heat conduction with the hot side plate, causing the water temperature to rise rapidly. When the positioning tube 52 swings in the reverse direction, the second connecting hole group 54 opens the outlet of the rear half of the cavity, allowing the high-temperature water to drain out, while simultaneously blocking the outlet of the front half of the cavity, causing the front half of the cavity to enter a residence heat exchange state.

[0050] With this setup, the actual equivalent residence time of the cold water fluid inside the plate is significantly extended, effectively compensating for the insufficient heat caused by the small flow heating side, and ensuring that the discharged cold water can reach the set temperature of 45℃ required by the drying room.

[0051] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A heat exchanger for waste heat recovery in glass kilns and hot water supply in drying rooms, characterized in that, It includes: A heat pipe (1) is connected at one end to the outlet of multiple glass furnaces. The plate heat exchanger assembly (2) has a hot water inlet on one side, and the other end of the heat pipe (1) is connected to the hot water inlet; A hot water outlet is located on the plate heat exchanger assembly (2) below the hot water inlet; The cold pipe (11) is connected at one end to the water tank of the workshop drying room. The plate heat exchange assembly (2) is provided with a cold water inlet on the side of the hot water inlet. The other end of the cold pipe (11) is connected to the cold water inlet. The cold water outlet is located below the cold water inlet; The diversion device (3) is installed on the plate heat exchange assembly (2) and located at the hot water inlet; The plate heat exchanger assembly (2) includes: The heat exchange plates (4) are multiple plates arranged in parallel, and heat exchange grooves are provided on the surface of the heat exchange plates (4); The heat exchange plate (4) is also provided with an inner through hole (43), and the side wall of the inner through hole (43) is also provided with a slot (42) that communicates with the heat exchange tank, forming an inner channel. The heat exchange plate (4) located in the odd position is provided with an inclined inner rib (44), which divides the heat exchange tank into a first heat flow chamber (45) and a second heat flow chamber (46), and the inner through hole (43) is connected to the first heat flow chamber (45); The heat exchange plate (4) has openings (41) at all four corners, and the two openings on the left side of the heat exchange plate (4) located in odd positions have slots (42) that form a heat conduction channel. The diversion device (3) includes: Y-shaped tube (31), one end of which is sealed and connected to the heat pipe (1); Two fixed tubes (32) are provided and are respectively connected to the Y-shaped tube (31). The other end of each fixed tube (32) is respectively connected to the heat conduction channel and the inner channel above. The valve body (33) is fixed inside the Y-shaped tube (31), and valve holes (34) are respectively opened at the top and bottom of the valve body (33). A valve seat is fixed to the valve body (33), and a valve stem (35) is slidably connected inside the valve seat. Both ends of the valve stem (35) are fixed with valve plugs (36). An electromagnetic drive device is fixed inside the valve seat and is used to drive the valve stem (35) to slide up and down.

2. The glass kiln waste heat recovery and drying room hot water quality isolation plate heat exchanger according to claim 1, characterized in that: The cold water outlet is connected to a delivery pipe (12), and the other end of the delivery pipe (12) is connected to the air-cooled radiator.

3. The glass kiln waste heat recovery and drying room hot water quality isolation plate heat exchanger according to claim 1, characterized in that, The plate heat exchanger assembly (2) also includes: A frame plate (21) has two guide rods (22) arranged parallel to each other on its upper and lower sides, and one end of each guide rod (22) is fixed to the frame plate (21); A clamping plate (23) is set parallel to one side of the frame plate (21); Multiple connecting screws (24) are provided, and their two ends are respectively connected through the frame plate (21) and the clamping plate (23). An adjusting nut is threaded on the connecting screw (24). A support frame (25) is fixed to one end of the guide rod (22) away from the frame plate (21); Each of the heat exchange plates (4) is closely distributed between the frame plate (21) and the clamping plate (23).

4. The glass kiln waste heat recovery and drying room hot water quality isolation plate heat exchanger according to claim 3, characterized in that: The heat exchange tank is provided with a flow guide protrusion. The two openings (41) distributed on the right side of the heat exchange plate (4) at even positions are provided with slots (42) to form a cold water channel. The port (41) is connected to the heat exchange tank through the slot (42).

5. The glass kiln waste heat recovery and drying room hot water quality isolation plate heat exchanger according to claim 4, characterized in that: Both the first heat flow cavity (45) and the second heat flow cavity (46) are connected to the port (41) on the lower left side.

6. The glass kiln waste heat recovery and drying room hot water quality isolation plate heat exchanger according to claim 5, characterized in that: The second heat flow cavity (46) has an inverted triangular structure.

7. The glass kiln waste heat recovery and drying room hot water quality isolation plate heat exchanger according to claim 1, characterized in that: The length of the valve stem (35) is less than the length between the two valve holes (34).

8. The glass kiln waste heat recovery and drying room hot water quality isolation plate heat exchanger according to claim 4, characterized in that: A connecting pipe (5) is fixed in the cold water channel located above. Multiple guide holes (51) are provided on the side wall of the connecting pipe (5). A positioning pipe (52) is rotatably connected inside the connecting pipe (5). A first connecting hole group (53) and a second connecting hole group (54) are provided on the positioning pipe (52).

9. A glass kiln waste heat recovery and drying room hot water quality isolation plate heat exchanger according to claim 8, characterized in that: The first connecting hole group (53) and the second connecting hole group (54) are configured as arc-shaped structures and are staggered between each other. The first connecting hole group (53) and the second connecting hole group (54) have a partially overlapping area. The clamping plate (23) is provided with a swing drive device, and the output end of the swing drive device is connected to the positioning tube (52).

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