Printing and dyeing wastewater waste heat recycling device

Abstract

According to the printing and dyeing wastewater waste heat recycling device, when printing and dyeing wastewater flows along heat exchange pipes and passes through two heat exchange water tanks, the temperature of water in the heat exchange water tank which the printing and dyeing wastewater firstly passes through is high, the temperature of water in the heat exchange water tank which the printing and dyeing wastewater later passes through is low, and at the moment, the temperature of water in the previous heat exchange water tank can reach the set temperature; by opening a second electromagnetic valve on a water outlet branch pipe at the bottom, hot water is recycled after being discharged, and at the moment, the flowing direction of the hot water in a heat exchange pipe fitting is changed through a waste water conveying assembly, so that heat exchange of water in a next heat exchange water tank is realized, and the water in the heat exchange water tank can quickly reach a set temperature; finally, the flowing direction of the printing and dyeing wastewater in the heat exchange pipe fitting is switched in a reciprocating mode, water inlet and outlet of the two heat exchange water tanks are matched, the heat exchange efficiency can be improved, and the waste heat recycling rate of the printing and dyeing wastewater is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of printing and dyeing equipment, in particular to a printing and dyeing wastewater waste heat recovery and utilization device. Background Art

[0002] Printing and dyeing processing is a high-energy-consuming industry that consumes a lot of steam and discharges wastewater with huge heat content into the environment. For every 100m3 of product processed, an average of 3.5-5.5 tons of wastewater of different temperatures is generated. Printing and dyeing wastewater has the characteristics of large water volume and organic pollutant content, complex composition, deep chromaticity, and large changes in water quality. It is difficult to treat industrial wastewater. At present, printing and dyeing enterprises either discharge printing and dyeing hot wastewater directly into the wastewater treatment system, making the wastewater temperature in the wastewater treatment system reach about 50°C, which not only inhibits the efficiency of biochemical treatment, but also causes serious waste of waste heat resources.

[0003] At present, a Chinese patent with the authorization announcement number CN219995966U and the authorization announcement date of November 10, 2023 discloses "A device for recovering heat from printing and dyeing wastewater", which recycles waste heat in printing and dyeing wastewater through heat exchange by setting up heat exchange barrels and spiral heat exchange tubes.

[0004] In the above-mentioned thermal energy recovery and utilization of printing and dyeing wastewater, the printing and dyeing wastewater is always in a discharge state. However, when the water in the heat exchange barrel reaches the set temperature, the water needs to be transported to other places for recycling. After the hot water is output, cold water is input to continue the heat exchange. During the period of hot water output and cold water input, the heat of the printing and dyeing wastewater in the spiral heat exchange tube cannot be utilized, thus affecting the heat exchange efficiency. Utility Model Content

[0005] The utility model aims to provide a device for recovering and utilizing waste heat of printing and dyeing wastewater, which has the function of improving the heat exchange efficiency.

[0006] The above technical objectives of the utility model are achieved through the following technical solutions: a waste heat recovery and utilization device for printing and dyeing wastewater, comprising a water storage tank, a heat exchange mechanism for the printing and dyeing wastewater to flow through and heat the cold water in the water storage tank, the water storage tank comprising an insulating box body, two heat exchange water tanks arranged in the insulating water tank, and a suspended connection component; a water inlet main pipe is arranged on the top of the insulating box body, a water outlet main pipe is arranged on the bottom of the insulating box body, a water inlet branch pipe with a first solenoid valve is arranged on the top of the heat exchange water tank, and a water inlet branch pipe with a first solenoid valve is arranged on the bottom of the heat exchange water tank A water outlet branch with a second solenoid valve, the two water inlet branches are connected to the water inlet main pipe, the two water outlet branches are connected to the water outlet main pipe, the suspended connection component is arranged between the heat-insulating box body and the two water exchange water tanks and the two water exchange water tanks are suspended; the heat exchange mechanism includes a heat exchange pipe having two spiral heat exchange parts respectively located in the two water exchange water tanks, and a wastewater conveying component that is connected to both ends of the heat exchange pipe and can change the flow direction of the printing and dyeing wastewater in the heat exchange pipe, and the wastewater conveying component can receive and discharge the printing and dyeing wastewater.

[0007] By adopting the above technical scheme, when the printing and dyeing wastewater flows along the heat exchange pipe fittings through two water exchange tanks, the water temperature in the first water exchange tank is higher and the water temperature in the later water exchange tank is lower. At this time, the water in the previous water exchange tank will reach the set temperature. By opening the second solenoid valve on the water outlet branch at the bottom, the hot water can be recycled after being discharged. At this time, the flow direction in the heat exchange pipe fittings is changed by the wastewater conveying component to achieve heat exchange of the water in the previous and next water exchange tanks, so that the water in the water exchange tank reaches the set temperature faster. Finally, by reciprocatingly switching the flow direction of the printing and dyeing wastewater in the heat exchange pipe fittings and coordinating the inlet and outlet water of the two water exchange tanks, the heat exchange efficiency can be improved, and the waste heat recovery rate of the printing and dyeing wastewater can be improved.

[0008] The utility model is further configured as follows: a square shelf frame is arranged on the peripheral side of the lower end of the water exchange water tank, the suspended connection component includes a shelf rack arranged in the water storage tank and a plurality of fixing components, the shelf rack is provided with two shelf grooves on which the lower ends of the water exchange water tanks are placed in a vertical downward direction, a rubber buffer pad is arranged at the bottom of the shelf groove, and the fixing component includes a plurality of fixing plates pressed against the upper surface of the square shelf frame, and fixing knob bolts threadedly connected to the shelf rack after passing through the fixing plates.

[0009] By adopting the above technical solution, the two water exchange tanks are suspended in the air, so that an air insulation layer is formed between the water exchange tank and the insulation box body, so that the water temperature in the water exchange tank is not easily lost; at the same time, the setting of the rubber buffer pad can reduce the vibration generated when the water enters and exits the water exchange tank.

[0010] The utility model is further configured as follows: the wastewater conveying assembly includes a third electromagnetic three-way valve arranged at one end of the heat exchange pipe fitting, a fourth electromagnetic three-way valve arranged at the other end of the heat exchange pipe fitting, a wastewater inlet pipe connected between a joint of the third electromagnetic three-way valve and a joint of the fourth electromagnetic three-way valve, and a wastewater outlet pipe connected between another joint of the third electromagnetic three-way valve and another joint of the fourth electromagnetic three-way valve.

[0011] By adopting the above technical solution, by changing the connection direction of the third electromagnetic three-way valve and the fourth electromagnetic three-way valve, the flow direction of the printing and dyeing wastewater in the heat exchange pipe can be changed, so as to achieve reciprocating rapid heat exchange of the water in the water exchange water tank that passes first, thereby improving the water output efficiency of the heated water.

[0012] The utility model is further configured as follows: the wastewater conveying components are all located in a heat-insulating box, the water inlet end of the wastewater inlet pipe passes through the heat-insulating box, and the water outlet end of the wastewater outlet pipe passes through the heat-insulating box.

[0013] By adopting the above technical solution, the wastewater conveying components are all located in the heat-insulating box, which can reduce the heat dissipation of the printing and dyeing wastewater when it flows in the wastewater conveying components.

[0014] The utility model is further configured as follows: a water outlet is provided at the bottom of the heat exchange water tank, a water return port is provided at the top of the heat exchange water tank, a circulating water pipe is provided between the water outlet and the water return port, and a circulating water pump is provided in the middle of the circulating water pipe.

[0015] By adopting the above technical solution, during the heat exchange process, the circulating water pump is started at a fixed time, so that the water in the heat exchange water tank can circulate, thereby ensuring the uniformity of the water temperature in the heat exchange water tank.

[0016] The utility model is further configured as follows: a heat insulating cotton pad is arranged on each end surface inside the heat insulating box.

[0017] By adopting the above technical solution and arranging a heat insulating cotton pad on each end surface of the heat insulating box body, the heat insulating performance of the heat insulating box body is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model;

[0019] Figure 2 It is a schematic diagram of the structure of the utility model after removing the heat insulation box body.

[0020] 11. Insulation box; 111. Water inlet main pipe; 112. Water outlet main pipe; 113. Insulation cotton pad; 12. Heat exchange water tank; 121. Water inlet manifold; 122. First solenoid valve; 123. Water outlet manifold; 124. Second solenoid valve; 125. Square shelf frame; 126. Water outlet; 127. Water return port; 128. Circulating water pipe; 129. Circulating water pump; 13. Suspended connection assembly; 131. Shelving rack; 1311. Shelving groove; 1312. Rubber buffer pad; 132. Fixing assembly; 1321. Fixing plate; 1322. Fixing knob bolt; 21. Heat exchange pipe fitting; 211. Spiral heat exchange part; 22. Wastewater conveying assembly; 221. Third solenoid three-way valve; 222. Fourth solenoid three-way valve; 223. Wastewater inlet pipe; 224. Wastewater outlet pipe. DETAILED DESCRIPTION

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

[0022] Embodiment: A device for recovering waste heat from printing and dyeing wastewater, such as Figure 1 As shown, it includes a water storage tank and a heat exchange mechanism for the printing and dyeing wastewater to flow through and heat the cold water in the water storage tank. The water storage tank includes an insulated box body 11, two heat exchange water tanks 12 arranged in the insulated water tank, and a suspended connection component 13. The heat exchange mechanism includes a heat exchange pipe 21 having two spiral heat exchange parts 211 respectively located in the two heat exchange water tanks 12, and a wastewater conveying component 22 that is connected to both ends of the heat exchange pipe 21 and can change the flow direction of the printing and dyeing wastewater in the heat exchange pipe 21. The wastewater conveying component 22 can receive and discharge the printing and dyeing wastewater.

[0023] like Figure 1 and Figure 2 As shown, a water inlet main pipe 111 is arranged on the top of the insulation box body 11, a water outlet main pipe 112 is arranged on the bottom of the insulation box body 11, a water inlet branch 121 with a first solenoid valve 122 is arranged on the top of the water exchange tank 12, and a water outlet branch 123 with a second solenoid valve 124 is arranged on the bottom of the water exchange tank 12, the two water inlet branches 121 are connected with the water inlet main pipe 111, and the two water outlet branches 123 are connected with the water outlet main pipe 112, and the suspended connection component 13 is arranged between the insulation box body 11 and the two water exchange tanks 12 so that the two water exchange tanks 12 are suspended.

[0024] like Figure 1 and Figure 2As shown, a heat insulating cotton pad 113 is bonded to each end face of the inner side of the heat insulating box body 11. A water outlet 126 is provided at the bottom of the heat exchange water tank 12, a water return port 127 is provided at the top of the heat exchange water tank 12, a circulating water pipe 128 is provided between the water outlet 126 and the water return port 127, and a circulating water pump 129 is provided in the middle of the circulating water pipe 128. A square shelf frame 125 is arranged around the lower end of the water exchange tank 12. The suspended connection component 13 includes a shelf rack 131 and a plurality of fixing components 132 arranged in the water tank. The shelf rack 131 is provided with two shelf grooves 1311 on which the lower ends of the water exchange tanks 12 are placed in a vertical downward direction. A rubber buffer pad 1312 is arranged at the bottom of the shelf groove 1311. The fixing component 132 includes a plurality of fixing plates 1321 pressed against the upper surface of the square shelf frame 125, and a fixing knob bolt 1322 that passes through the fixing plate 1321 and is threadedly connected to the shelf rack 131.

[0025] like Figure 1 and Figure 2 As shown, the wastewater conveying assembly 22 includes a third electromagnetic three-way valve 221 disposed at one end of the heat exchange pipe 21, a fourth electromagnetic three-way valve 222 disposed at the other end of the heat exchange pipe 21, a wastewater inlet pipe 223 connected between a joint of the third electromagnetic three-way valve 221 and a joint of the fourth electromagnetic three-way valve 222, and a wastewater outlet pipe 224 connected between another joint of the third electromagnetic three-way valve 221 and another joint of the fourth electromagnetic three-way valve 222. The wastewater conveying assembly 22 is located in the heat-insulating box 11, the water inlet end of the wastewater inlet pipe 223 passes through the heat-insulating box 11, and the water outlet end of the wastewater outlet pipe 224 passes through the heat-insulating box 11.

[0026] Implementation effect: When the printing and dyeing wastewater flows along the heat exchange pipe 21 through the two water exchange tanks 12, the water temperature in the first water exchange tank 12 is higher and the water temperature in the later water exchange tank 12 is lower. At this time, the water in the previous water exchange tank 12 will reach the set temperature. By opening the second solenoid valve 124 on the bottom water outlet branch 123, the hot water can be recycled after being discharged. At this time, the flow direction in the heat exchange pipe 21 is changed by the wastewater conveying component 22 to achieve heat exchange of the water in the previous and next water exchange tanks 12, so that the water in the water exchange tank 12 can reach the set temperature faster. Finally, by reciprocatingly switching the flow direction of the printing and dyeing wastewater in the heat exchange pipe 21 and coordinating the inlet and outlet water of the two water exchange tanks 12, the heat exchange efficiency can be improved, and the waste heat recovery rate of the printing and dyeing wastewater can be improved.

[0027] The suspended arrangement of the two heat exchange water tanks 12 forms an air insulation layer between the heat exchange water tanks 12 and the heat insulation box 11, so that the water temperature in the heat exchange water tanks 12 is not easy to dissipate; at the same time, the setting of the rubber buffer pad 1312 can reduce the vibration generated when the water enters and exits the heat exchange water tank 12. By changing the connection direction of the third electromagnetic three-way valve 221 and the fourth electromagnetic three-way valve 222, the flow direction of the printing and dyeing wastewater in the heat exchange pipe 21 can be changed, and the water in the first heat exchange water tank 12 can be reciprocated for rapid heat exchange, thereby improving the water output efficiency of the heated water. The wastewater conveying components 22 are all located in the heat insulation box 11, which can reduce the heat dissipation of the printing and dyeing wastewater when it flows in the wastewater conveying components 22. During the heat exchange process, by starting the circulating water pump 129 at a fixed time, the water in the heat exchange water tank 12 can be circulated, thereby ensuring the uniformity of the water temperature in the heat exchange water tank 12. By arranging a heat insulating cotton pad 113 in each embedding groove 113 of the heat insulating box body 11, the heat insulating performance of the heat insulating box body 11 is ensured.

[0028] 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, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A device for recovering waste heat from printing and dyeing wastewater, comprising a water storage tank and a heat exchange mechanism through which the printing and dyeing wastewater flows to heat the cold water in the water storage tank, characterized in that: The water storage tank comprises a heat-insulating box body (11), two heat exchange water tanks (12) arranged in the heat-insulating box body, and a suspended connection component (13); a water inlet main pipe (111) is arranged at the top of the heat-insulating box body (11), a water outlet main pipe (112) is arranged at the bottom of the heat-insulating box body (11), a water inlet branch (121) having a first electromagnetic valve (122) is arranged at the top of the heat exchange water tank (12), a water outlet branch (123) having a second electromagnetic valve (124) is arranged at the bottom of the heat exchange water tank (12), the two water inlet branches (121) are connected to the water inlet main pipe (111), and the two water outlet branches (123) are connected to the water outlet main pipe (112); the suspended connection component (13) is arranged between the heat-insulating box body (11) and the two heat exchange water tanks (12) so that the two heat exchange water tanks (12) are suspended; The heat exchange mechanism comprises a heat exchange pipe (21) having two spiral heat exchange parts (211) respectively located in two heat exchange water tanks (12), and a wastewater conveying component (22) which is in communication with both ends of the heat exchange pipe (21) and can change the flow direction of the printing and dyeing wastewater in the heat exchange pipe (21); the wastewater conveying component (22) can receive and discharge the printing and dyeing wastewater.

2. The device for recovering waste heat from printing and dyeing wastewater according to claim 1, characterized in that: A square shelf frame (125) is arranged around the lower end of the water exchange tank (12); the suspended connection component (13) comprises a shelf frame (131) arranged in the water storage tank and a plurality of fixing components (132); the shelf frame (131) is provided with two shelf grooves (1311) on which the lower ends of the water exchange tanks (12) are placed in a vertical downward direction; a rubber buffer pad (1312) is arranged at the bottom of the shelf groove (1311); and the fixing component (132) comprises a plurality of fixing sheets (1321) pressed against the upper surface of the square shelf frame (125) and fixing knob bolts (1322) passing through the fixing sheets (1321) and being threadedly connected to the shelf frame (131).

3. The device for recovering waste heat from printing and dyeing wastewater according to claim 1, characterized in that: The wastewater conveying assembly (22) comprises a third electromagnetic three-way valve (221) arranged at one end of the heat exchange pipe (21), a fourth electromagnetic three-way valve (222) arranged at the other end of the heat exchange pipe (21), a wastewater inlet pipe (223) connected between a joint of the third electromagnetic three-way valve (221) and a joint of the fourth electromagnetic three-way valve (222), and a wastewater outlet pipe (224) connected between another joint of the third electromagnetic three-way valve (221) and another joint of the fourth electromagnetic three-way valve (222).

4. The device for recovering waste heat from printing and dyeing wastewater according to claim 3 is characterized in that: The wastewater conveying components (22) are all located in the heat-insulating box (11), the water inlet end of the wastewater inlet pipe (223) passes through the heat-insulating box (11), and the water outlet end of the wastewater outlet pipe (224) passes through the heat-insulating box (11).

5. The device for recovering waste heat from printing and dyeing wastewater according to claim 1, characterized in that: The bottom of the heat exchange water tank (12) is provided with a water outlet (126), the top of the heat exchange water tank (12) is provided with a water return port (127), a circulating water pipe (128) is provided between the water outlet (126) and the water return port (127), and a circulating water pump (129) is provided in the middle of the circulating water pipe (128).

6. The device for recovering waste heat from printing and dyeing wastewater according to claim 1, characterized in that: A heat insulating cotton pad (113) is arranged on each end surface inside the heat insulating box (11).

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