Waste heat recovery system of setting machine

Abstract

The utility model discloses a waste heat recovery system of a setting machine. Cold water can selectively flow along two paths of a first heat exchange assembly and a second heat exchange assembly for heat exchange. When cold water flows along the two paths, the number of the first heat exchange pipes or the second heat exchange pipes of each path can be the same as that of the conventional heat exchange pipes, and at the moment, the water flows along any path for a long time, and the conventional heat exchange effect can be achieved; however, when the cold water flows along the first heat exchange assembly, the high-temperature waste gas can heat a second heat exchange pipe of the second heat exchange assembly, so that the temperature of the second heat exchange pipe is far higher than that of the first heat exchange pipe with cold water flowing, and when the temperature of the second heat exchange pipe reaches the peak, the cold water is switched to flow along the second heat exchange assembly; due to the fact that the initial temperature of the switched second heat exchange pipe is high, when the heating temperature needed by the cold water is determined, the flowing speed of the cold water can be increased, and finally the waste heat utilization efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of setting machines, in particular to a waste heat recovery system for setting machines. Background Art

[0002] Dyeing and finishing machines are important equipment in the finishing process of printing and dyeing, and are also the "big energy consumers" in the printing and dyeing industry. However, the waste gas produced by the finishing machine has the characteristics of high temperature and oil smoke. Directly emitting waste gas not only causes air pollution, but also causes a large waste of heat, which is not conducive to the sustainable development of resources.

[0003] In the waste heat recovery of the setting machine, the main thing is to heat the cold air or the cold water. Through the principle of heat exchange, the temperature of the cold air or the cold water is increased to achieve waste heat recovery.

[0004] When heat exchange is performed by cold water, a heat exchanger is set up, and cold water flows along the water inlet pipe, multiple heat exchange pipes, and the water outlet pipe of the heat exchanger. High-temperature exhaust gas flows from the air inlet pipe of the heat exchanger, the inside of the heat exchanger, and the air outlet pipe, and the cold water is heated by the heat exchange pipe. When other conditions remain unchanged, the speed at which cold water flows in the heat exchange pipe (the time required to pass through the heat exchange pipe) will affect the final temperature of the cold water. If the cold water flows too fast, the amount of water heated per unit time is large but the water temperature is low; if the cold water flows too slowly, the amount of water heated per unit time is small but the water temperature is high. Therefore, there are deficiencies in heat exchange. Utility Model Content

[0005] The utility model aims to provide a waste heat recovery system for a setting machine, which has the function of improving the waste heat utilization efficiency.

[0006] The above technical purpose of the utility model is achieved through the following technical solutions: a waste heat recovery system for a setting machine, comprising an exhaust gas main pipe connecting the exhaust gas pipes of multiple setting machines, a heat exchanger, a first fan connected between the exhaust gas main pipe and the heat exchanger, a wet electrostatic device, and a second fan connected between the heat exchanger and the wet electrostatic device. The heat exchanger comprises a shell, an air inlet duct arranged at the bottom of the shell and communicating with the first fan, an air outlet duct arranged at the top of the shell and communicating with the second fan, and a heat exchange device arranged in the shell. The heat exchange device comprises a first heat exchange component and a second heat exchange component; the first heat exchange component comprises a plurality of first heat exchange tubes extending in a vertical direction, a first cold water pipe communicating with the tops of the plurality of first heat exchange tubes a first hot water pipe communicating with the bottom of the plurality of first heat exchange tubes; the second heat exchange assembly includes a plurality of second heat exchange tubes extending in a vertical direction, a second cold water pipe communicating with the top of the plurality of second heat exchange tubes, and a second hot water pipe communicating with the bottom of the plurality of second heat exchange tubes; a first electromagnetic three-way valve is arranged between the water inlet ends of the first cold water pipe and the second cold water pipe, and a second electromagnetic three-way valve is arranged between the water outlet ends of the first hot water pipe and the second hot water pipe; the plurality of first heat exchange tubes and the plurality of second heat exchange tubes are distributed in a rectangular array as a whole, the number of the first heat exchange tubes is the same as the number of the second heat exchange tubes, and in any multiple directions in front, behind, left and right of any one of the first heat exchange tubes, the adjacent ones are all second heat exchange tubes.

[0007] By adopting the above technical solution, when cold water flows along the heat exchange tube and exchanges heat, the temperature of the heat exchange tube is the temperature of the heat exchange tube heated by the high-temperature exhaust gas minus the temperature taken away during the flow of cold water. Therefore, under the premise of unchanged conditions, the temperature of the heat exchange tube at various points along its length will remain in a relatively constant state as the cold water flows. In addition, the number of heat exchange tubes through which cold water flows at the same time cannot be too large, otherwise it will affect the final outlet temperature of the cold water. In the present application, the cold water can choose to flow along the first heat exchange component and the second heat exchange component for heat exchange: (1) flow along the first cold water pipe, multiple first heat exchange tubes, and first hot water pipe for heat exchange; (2) flow along the second cold water pipe, multiple second heat exchange tubes, and second hot water pipe for heat exchange. When cold water flows along two paths, the number of first heat exchange tubes or second heat exchange tubes in each path can be made the same as the number of conventional heat exchange tubes. At this time, water can achieve conventional heat exchange effects by flowing along any path for a long time. However, when cold water flows along the first heat exchange component, the high-temperature exhaust gas will heat the second heat exchange tube of the second heat exchange component, so that the temperature of the second heat exchange tube is much higher than the temperature of the first heat exchange tube with cold water flowing. When the temperature of the second heat exchange tube reaches its peak, the cold water is switched to flow along the second heat exchange component. Since the initial temperature of the second heat exchange tube after switching is higher, the flow rate of the cold water can be increased when determining the required heating temperature of the cold water, thereby ultimately improving the waste heat utilization efficiency.

[0008] The utility model is further configured as follows: the upper ends of the plurality of first heat exchange tubes are higher than the upper ends of the plurality of second heat exchange tubes, and the lower ends of the plurality of first heat exchange tubes are higher than the lower ends of the plurality of second heat exchange tubes; the first cold water pipeline includes a first cold square tube arranged in the shell, a plurality of first cold water branch pipes connected in the first cold square tube and in a wavy line shape, a first cold connecting pipe communicating with the first cold square tube and having a water inlet end, and the plurality of first heat exchange tubes are connected to the turning point of the first cold water branch; the first hot water pipeline includes a first hot square tube in the shell, a plurality of first hot water branch pipes connected in the first hot square tube and in a wavy line shape, a first hot water branch pipe communicating with the first hot square tube and having a water inlet end The first heat connecting pipe at the end, and the plurality of the first heat exchange pipes are connected to the turning point of the first hot water branch pipe; the second cold water pipeline includes a second cold square pipe arranged in the shell, a plurality of second cold water branch pipes connected in the second cold square pipe and in a zigzag line shape, and a second cold connecting pipe communicating with the second cold square pipe and having a water inlet end, and the plurality of the second heat exchange pipes are connected to the turning point of the second cold water branch pipe; the second hot water pipeline includes a second hot square pipe arranged in the shell, a plurality of second hot water branch pipes connected in the second hot square pipe and in a zigzag line shape, and a second heat connecting pipe communicating with the second hot square pipe and having a water inlet end, and the plurality of the second heat exchange pipes are connected to the turning point of the second hot water branch pipe.

[0009] By adopting the above technical solution, the first cold water branch, the first hot water branch, the second cold water branch, and the second hot water branch are all wavy line-shaped, and there is a height difference between the upper and lower ends of the multiple first heat exchange tubes and the multiple second heat exchange tubes, so as to realize the connection between the first cold water pipe, the first hot water pipe and the multiple first heat exchange tubes, and realize the connection between the second cold water pipe, the second hot water pipe and the multiple second heat exchange tubes.

[0010] The utility model is further configured as follows: a spiral preheating tube is arranged around the air outlet pipe of the shell, one end of the spiral preheating tube is connected to the remaining joint of the first electromagnetic three-way valve, and the other end of the spiral preheating tube is used to connect to a cold water source.

[0011] By adopting the above technical solution, the cold water source is preheated through the spiral heat exchange tube, thereby further increasing the initial water temperature of the cold water when exchanging heat in the first heat exchange component and the second heat exchange component, thereby improving the waste heat utilization efficiency.

[0012] The utility model is further configured as follows: the shell is double-layered, and a heat-insulating cavity is formed inside the peripheral side of the shell.

[0013] By adopting the above technical solution and providing a heat-insulating cavity, it is possible to avoid the temperature on the shell surface being too high, thereby preventing the heat from the high-temperature exhaust gas from dissipating.

[0014] The utility model is further configured as follows: the lower end of the heat-insulating cavity is connected to a water inlet joint, the upper end of the heat-insulating cavity is connected to a water outlet joint, the water outlet joint is communicated with the spiral preheating pipe, and the water inlet joint is used to connect to a cold water source.

[0015] By adopting the above technical solution, the spiral preheating tube is connected to the insulation cavity, so as to further increase the initial water temperature of the cold water and improve the waste heat utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 It is a structural schematic diagram of the heat exchanger in the utility model;

[0018] Figure 3 It is a structural schematic diagram of the heat exchange device in the utility model;

[0019] Figure 4 It is a structural explosion diagram of the heat exchange device in the utility model.

[0020] Figure numerals: 1, exhaust gas main pipe; 2, heat exchanger; 21, shell; 211, heat insulation cavity; 212, water inlet joint; 213, water outlet joint; 22, air inlet pipe; 23, air outlet pipe; 24, heat exchange device; 241, first heat exchange component; 2411, first heat exchange pipe; 2412, first cold water pipe; 24121, first cold square pipe; 24122, first cold water branch; 24123, first cold connecting pipe; 2413, first hot water pipe; 21431, first hot square pipe; 24132, first hot water branch; 24 133, first heat connecting pipe; 242, second heat exchange component; 2421, second heat exchange pipe; 2422, second cold water pipe; 24221, second cold square pipe; 24222, second cold water branch; 24223, second cold connecting pipe; 2423, second hot water pipe; 24231, second hot square pipe; 24232, second hot water branch; 24233, second heat connecting pipe; 25, first electromagnetic three-way valve; 26, second electromagnetic three-way valve; 27, spiral preheating pipe; 3, first fan; 4, wet electrostatic device; 5, second fan. DETAILED DESCRIPTION

[0021] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0022] Embodiment: A waste heat recovery system for a setting machine, such as Figure 1 and Figure 2As shown, it includes an exhaust main pipe 1 connecting the exhaust pipes of multiple molding machines, a heat exchanger 2, a first fan 3 connected between the exhaust main pipe 1 and the heat exchanger 2, a wet electrostatic device 4, and a second fan 5 connected between the heat exchanger 2 and the wet electrostatic device 4. The heat exchanger 2 includes a shell 21, an air inlet duct 22 arranged at the bottom of the shell 21 and communicated with the first fan 3, an air outlet duct 23 arranged at the top of the shell 21 and communicated with the second fan 5, and a heat exchange device 24 arranged in the shell 21.

[0023] like Figures 1 to 3 As shown, the heat exchange device 24 includes a first heat exchange component 241 and a second heat exchange component 242. The first heat exchange component 241 includes a plurality of first heat exchange tubes 2411 extending in a vertical direction, a first cold water pipe 2412 communicating with the tops of the plurality of first heat exchange tubes 2411, and a first hot water pipe 2413 communicating with the bottoms of the plurality of first heat exchange tubes 2411. The second heat exchange component 242 includes a plurality of second heat exchange tubes 2421 extending in a vertical direction, a second cold water pipe 2422 communicating with the tops of the plurality of second heat exchange tubes 2421, and a second hot water pipe 2423 communicating with the bottoms of the plurality of second heat exchange tubes 2421.

[0024] like Figures 2 to 4 As shown, the upper ends of the plurality of first heat exchange tubes 2411 are higher than the upper ends of the plurality of second heat exchange tubes 2421, and the lower ends of the plurality of first heat exchange tubes 2411 are higher than the lower ends of the plurality of second heat exchange tubes 2421. The plurality of first heat exchange tubes 2411 and the plurality of second heat exchange tubes 2421 are distributed in a rectangular array as a whole, the number of the first heat exchange tubes 2411 is the same as the number of the second heat exchange tubes 2421, and in any multiple directions in front, behind, left, and right of any first heat exchange tube 2411, the adjacent ones are all second heat exchange tubes 2421.

[0025] like Figures 2 to 4As shown, the first cold water pipe 2412 includes a first cold square tube 24121 arranged in the shell 21, a plurality of first cold water branch pipes 24122 connected to the first cold square tube 24121 and in a zigzag line shape, a first cold connecting pipe 24123 communicating with the first cold square tube 24121 and having a water inlet end, and a plurality of first heat exchange tubes 2411 are connected to the turning point of the first cold water branch pipe 24122; the first hot water pipe 2413 includes a first hot square tube 21431 in the shell 21, a plurality of first hot water branch pipes 24132 connected to the first hot square tube 21431 and in a zigzag line shape, a first hot connecting pipe 24133 communicating with the first hot square tube 21431 and having a water inlet end, and a plurality of first heat exchange tubes 2411 are connected to the turning point of the first hot water branch pipe 24132. The second cold water pipeline 2422 includes a second cold square tube 24221 disposed in the shell 21, a plurality of second cold water branch pipes 24222 connected to the second cold square tube 24221 and in a zigzag line shape, a second cold connecting pipe 24223 communicating with the second cold square tube 24221 and having a water inlet end, and a plurality of second heat exchange pipes 2421 connected to the turning point of the second cold water branch pipe 24222; the second hot water pipeline 2423 includes a second hot square tube 24231 disposed in the shell 21, a plurality of second hot water branch pipes 24232 connected to the second hot square tube 24231 and in a zigzag line shape, a second hot connecting pipe 24233 communicating with the second hot square tube 24231 and having a water inlet end, and a plurality of second heat exchange pipes 2421 connected to the turning point of the second hot water branch pipe 24232

[0026] like Figure 2 and Figure 4 As shown, a first electromagnetic three-way valve 25 is provided between the water inlet ends of the first cold water pipe 2412 and the second cold water pipe 2422 , and a second electromagnetic three-way valve 26 is provided between the water outlet ends of the first hot water pipe 2413 and the second hot water pipe 2423 .

[0027] like Figure 2 As shown, a spiral preheating pipe 27 is arranged around the air outlet pipe 23 of the shell 21, and one end of the spiral preheating pipe 27 is connected to the remaining joint of the first electromagnetic three-way valve 25. The shell 21 is double-layered, and an insulating cavity 211 is formed inside the circumference of the shell 21. The lower end of the insulating cavity 211 is connected to a water inlet joint 212, and the upper end of the insulating cavity 211 is connected to a water outlet joint 213, which is connected to the other end of the spiral preheating pipe 27, and the water inlet joint 212 is used to connect to a cold water source.

[0028] Implementation effect: When cold water flows along the heat exchange tube and exchanges heat, the temperature of the heat exchange tube is the temperature of the heat exchange tube heated by the high-temperature exhaust gas minus the temperature taken away during the flow of cold water. Therefore, under the premise that conditions remain unchanged, the temperature of the heat exchange tube at various points along its length will remain in a relatively constant state as the cold water flows. In addition, the number of heat exchange tubes through which cold water flows at the same time cannot be too large, otherwise it will affect the final outlet temperature of the cold water. In the present application, the cold water can choose to flow along the first heat exchange component 241 and the second heat exchange component 242 for heat exchange: (1) flow along the first cold water pipe 2412, multiple first heat exchange pipes 2411, and the first hot water pipe 2413 for heat exchange; (2) flow along the second cold water pipe 2422, multiple second heat exchange pipes 2421, and the second hot water pipe 2423 for heat exchange. When cold water flows along two paths, the number of first heat exchange tubes 2411 or second heat exchange tubes 2421 in each path can be made the same as the number of conventional heat exchange tubes. At this time, water can achieve conventional heat exchange effects by flowing along any path for a long time. However, when cold water flows along the first heat exchange component 241, the high-temperature exhaust gas will heat the second heat exchange tube 2421 of the second heat exchange component 242, so that the temperature of the second heat exchange tube 2421 is much higher than the temperature of the first heat exchange tube 2411 with cold water flowing. When the temperature of the second heat exchange tube 2421 reaches its peak, the cold water is switched to flow along the second heat exchange component 242. Since the initial temperature of the second heat exchange tube 2421 after switching is higher, the flow rate of the cold water can be increased when determining the required heating temperature of the cold water, thereby ultimately improving the waste heat utilization efficiency.

[0029] The first cold water branch 24122, the first hot water branch 24132, the second cold water branch 24222, and the second hot water branch 24232 are all in the shape of wavy lines, and there is a height difference between the upper and lower ends of the plurality of first heat exchange tubes 2411 and the plurality of second heat exchange tubes 2421, so as to realize the connection between the first cold water pipe 2412, the first hot water pipe 2413 and the plurality of first heat exchange tubes 2411, and realize the connection between the second cold water pipe 2422, the second hot water pipe 2423 and the plurality of second heat exchange tubes 2421. The cold water source is preheated by the spiral heat exchange tube, so as to further improve the initial water temperature of the cold water when the first heat exchange component 241 and the second heat exchange component 242 are exchanged, and the waste heat utilization efficiency is improved. By setting the heat insulation cavity 211, it is possible to avoid the situation where the temperature of the surface of the shell 21 is too high, thereby causing the heat dissipation of the high-temperature exhaust gas. By connecting the spiral preheating tube 27 to the heat-insulating cavity 211 , the initial water temperature of the cold water is further increased, thereby improving the waste heat utilization efficiency.

[0030] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A waste heat recovery system for a setting machine, comprising an exhaust gas main pipe (1) connecting the exhaust gas pipes of a plurality of setting machines, a heat exchanger (2), a first fan (3) connected between the exhaust gas main pipe (1) and the heat exchanger (2), a wet electrostatic device (4), and a second fan (5) connected between the heat exchanger (2) and the wet electrostatic device (4), wherein the heat exchanger (2) comprises a shell (21), an air inlet duct (22) arranged at the bottom of the shell (21) and communicating with the first fan (3), an air outlet duct (23) arranged at the top of the shell (21) and communicating with the second fan (5), and a heat exchange device (24) arranged in the shell (21), characterized in that: The heat exchange device (24) comprises a first heat exchange component (241) and a second heat exchange component (242); the first heat exchange component (241) comprises a plurality of first heat exchange tubes (2411) extending in a vertical direction, a first cold water pipe (2412) communicating with the tops of the plurality of first heat exchange tubes (2411), and a first hot water pipe (2413) communicating with the bottoms of the plurality of first heat exchange tubes (2411); the second heat exchange component (242) comprises a plurality of second heat exchange tubes (2411) extending in a vertical direction. a first electromagnetic three-way valve (25) is provided between the water inlet ends of the first cold water pipe (2412) and the second cold water pipe (2422), and a second electromagnetic three-way valve (26) is provided between the water outlet ends of the first hot water pipe (2413) and the second hot water pipe (2423); The plurality of first heat exchange tubes (2411) and the plurality of second heat exchange tubes (2421) are distributed in a rectangular array as a whole. The number of the first heat exchange tubes (2411) is the same as the number of the second heat exchange tubes (2421). In any plurality of directions in front, behind, left, and right of any one of the first heat exchange tubes (2411), the adjacent ones are all second heat exchange tubes (2421).

2. A waste heat recovery system for a setting machine according to claim 1, characterized in that: The upper ends of the plurality of first heat exchange tubes (2411) are higher than the upper ends of the plurality of second heat exchange tubes (2421), and the lower ends of the plurality of first heat exchange tubes (2411) are higher than the lower ends of the plurality of second heat exchange tubes (2421); The first cold water pipeline (2412) comprises a first cold square tube (24121) arranged in the shell (21), a plurality of first cold water branch pipes (24122) connected to the first cold square tube (24121) and in a zigzag line shape, a first cold connecting pipe (24123) communicating with the first cold square tube (24121) and having a water inlet end, and the plurality of first heat exchange tubes (2411) are connected to the turning point of the first cold water branch pipe (24122); the first hot water pipeline (2413) comprises a first hot square tube (21431) in the shell (21), a plurality of first hot water branch pipes (24132) connected to the first hot square tube (21431) and in a zigzag line shape, a first hot connecting pipe (24133) communicating with the first hot square tube (21431) and having a water inlet end, and the plurality of first heat exchange tubes (2411) are connected to the turning point of the first hot water branch pipe (24132); The second cold water pipeline (2422) comprises a second cold square tube (24221) arranged in the shell (21), a plurality of second cold water branch pipes (24222) connected to the second cold square tube (24221) and in a zigzag line shape, a second cold connecting pipe (24223) communicating with the second cold square tube (24221) and having a water inlet end, and a plurality of second heat exchange tubes (2421) are connected to the turning point of the second cold water branch pipe (24222); the second hot water pipeline (2423) comprises a second hot square tube (24231) arranged in the shell (21), a plurality of second hot water branch pipes (24232) connected to the second hot square tube (24231) and in a zigzag line shape, a second hot connecting pipe (24233) communicating with the second hot square tube (24231) and having a water inlet end, and a plurality of second heat exchange tubes (2421) are connected to the turning point of the second hot water branch pipe (24232).

3. The waste heat recovery system for a setting machine according to claim 1 is characterized in that: A spiral preheating pipe (27) is arranged around the air outlet pipe (23) of the shell (21), one end of the spiral preheating pipe (27) is connected to the remaining joint of the first electromagnetic three-way valve (25), and the other end of the spiral preheating pipe (27) is used to connect to a cold water source.

4. A waste heat recovery system for a setting machine according to claim 3, characterized in that: The shell (21) is double-layered, and a heat-insulating cavity (211) is formed inside the peripheral side of the shell (21).

5. A waste heat recovery system for a setting machine according to claim 4, characterized in that: The lower end of the heat-insulating cavity (211) is connected to a water inlet joint (212), and the upper end of the heat-insulating cavity (211) is connected to a water outlet joint (213), the water outlet joint (213) is in communication with the spiral preheating pipe (27), and the water inlet joint (212) is used to connect to a cold water source.

Images