Condensate water energy-saving system

Abstract

The utility model relates to the technical field of heat energy recovery, and discloses a condensate water energy-saving system which comprises a condensate water tank provided with a condensate water inlet pipe and a condensate water outlet pipe, and a condensate water pump is respectively connected with the condensate water outlet pipe and a fresh air preheating system. A fresh air outlet pipe of the fresh air preheating system is connected with the process water preheating system, the process water preheating system comprises a heat exchanger, a raw water heat exchange pipe, a condensate water heat exchange pipe and a three-way adjusting valve, an inlet of the three-way adjusting valve is connected with the fresh air outlet pipe, the raw water heat exchange pipe and the condensate water heat exchange pipe are both fixed in the heat exchanger, and low-temperature process raw water is connected with the raw water heat exchange pipe. An outlet of the raw water heat exchange pipe is connected with the process water preheating pool, a first outlet of the three-way adjusting valve is connected with the condensate water heat exchange pipe, and an outlet of the condensate water heat exchange pipe and a second outlet of the three-way adjusting valve are both connected with the low-temperature condensate water pool. The system can make full use of heat of high-temperature condensate water, and the energy-saving and consumption-reducing effects are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat energy recovery, in particular to a condensate water energy-saving system. Background Art

[0002] In the process of malt production, a large amount of high-temperature condensate water is generated in the production stage of drying malt with hot air. In the prior art, a condensate water heat exchanger is usually arranged at the front end of a steam heat exchanger, and the condensate water discharged from the steam heat exchanger is discharged into a condensate water tank after passing through the condensate water heat exchanger. The temperature of the condensate water discharged into the condensate water tank is usually about 70-95°C. The heat of the high-temperature condensate water in the condensate water tank is not fully utilized, resulting in waste of heat energy, not conforming to the concept of energy conservation and environmental protection, increasing the production cost of malt production, and reducing the competitiveness of enterprises in the market. Content of the Utility Model

[0003] The utility model provides a condensate water energy-saving system, which can make full use of the heat of high-temperature condensate water, realize the reuse of resources, reduce the energy consumption in the production process, realize clean production, achieve the effect of energy conservation and consumption reduction, and improve the market competitiveness of enterprises.

[0004] The above object of the utility model is achieved by the following technical solutions:

[0005] A condensate water energy-saving system includes a condensate water tank. A condensate water inlet pipe is arranged at the upper part of the condensate water tank, and a condensate water outlet pipe is arranged at the bottom of the condensate water tank. The condensate water outlet pipe is connected to a condensate water pump, and the outlet of the condensate water pump is connected to a fresh air preheating system. The fresh air preheating system includes a fresh air preheater and a fresh air cylinder outside the fresh air preheater. The fresh air preheater is provided with a fresh air inlet pipe and a fresh air outlet pipe. The fresh air inlet pipe is connected to the outlet of the condensate water pump, and the fresh air outlet pipe is connected to a process water preheating system. The process water preheating system includes a heat exchanger, a raw water heat exchange pipe, a condensate water heat exchange pipe and a three-way regulating valve. The raw water heat exchange pipe and the condensate water heat exchange pipe are both fixedly installed in the heat exchanger. The two ends of the raw water heat exchange pipe and the two ends of the condensate water heat exchange pipe respectively penetrate through the outer wall of the heat exchanger, and the raw water heat exchange pipe and the condensate water heat exchange pipe are respectively hermetically connected to the outer wall of the heat exchanger. The inlet of the raw water heat exchange pipe is connected to a raw water inlet pipe for transporting low-temperature process raw water, and the outlet of the raw water heat exchange pipe is connected to a process water preheating pool. The inlet of the condensate water heat exchange pipe is connected to the first outlet of the three-way regulating valve, the inlet of the three-way regulating valve is connected to the fresh air outlet pipe, and the outlet of the condensate water heat exchange pipe and the second outlet of the three-way regulating valve are both connected to a low-temperature condensate water pool. The outlet of the raw water heat exchange pipe is connected to a temperature sensor, and both the temperature sensor and the three-way regulating valve are electrically connected to a controller.

[0006] The above-mentioned condensate energy-saving system, wherein a high-low continuous liquid level gauge is provided inside the condensate tank, a high liquid level switch valve is connected to the lower part of the condensate tank, and the outlet of the high liquid level switch valve is connected to a low-temperature condensate water tank; the high-low continuous liquid level gauge, the high liquid level switch valve and the condensate water pump are electrically connected to a controller.

[0007] The above-mentioned condensate energy-saving system, wherein a maintenance valve is connected to the bottom of the condensate tank, an overflow pipe is connected to the top of the condensate tank, and the outlets of the maintenance valve and the overflow pipe are both communicated with a floor drain.

[0008] The above-mentioned condensate energy-saving system, wherein one side of the fresh air duct is a fresh air inlet, the other side of the fresh air duct is a fresh air outlet, and a component to be heated is arranged at the fresh air outlet of the fresh air duct.

[0009] The above-mentioned condensate energy-saving system, wherein a plurality of fresh air preheaters are arranged inside the fresh air duct, the fresh air inlet pipes of the plurality of fresh air preheaters are connected in parallel and connected to the outlet of the condensate water pump; the fresh air outlet pipes of the plurality of fresh air preheaters are connected in parallel and connected to the inlet of a three-way regulating valve.

[0010] The above-mentioned condensate energy-saving system, wherein a raw water switch valve is connected to the raw water inlet pipe, a raw water discharge pipe is connected between the inlet of the raw water switch valve and the low-temperature process raw water, a discharge valve is connected to the raw water discharge pipe, the outlet of the raw water discharge pipe is connected to a process water tank, and a temperature display is connected to the raw water discharge pipe.

[0011] The above-mentioned condensate energy-saving system, wherein the condensate water outlet pipe is connected in parallel with three condensate water pumps, the inlet and outlet of each condensate water pump are respectively connected to a switch valve, and a check valve is connected between the outlet of each condensate water pump and the corresponding switch valve.

[0012] The above-mentioned condensate energy-saving system, wherein a discharge valve is connected to the fresh air inlet pipe, and the outlet of the discharge valve is connected to a floor drain.

[0013] The above-mentioned condensate energy-saving system, wherein the outlet of the condensate water heat exchange pipe is connected to a water outlet manual valve.

[0014] In summary, the beneficial technical effects of the present utility model are as follows:

[0015] Through the fresh air preheating system of the present utility model, preheating of outdoor fresh air by high-temperature condensate water is realized; through the process water preheating system, preheating of low-temperature process raw water in winter is realized; the system makes full use of the heat of high-temperature condensate water, realizes the reuse of resources, reduces the energy consumption in the production process, realizes clean production, achieves the effect of energy conservation and consumption reduction, and improves the market competitiveness of the enterprise. Description of the Drawings

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

[0017] Figure 2 is a process frame of the present utility model.

[0018] As shown in the figure, 1. Condensate water tank; 11. Condensate water inlet pipe; 12. Condensate water outlet pipe; 121. Condensate water pump; 122. Switch valve; 123. Check valve; 13. High and low continuous liquid level gauge; 14. High liquid level switch valve; 15. Maintenance valve; 16. Overflow pipe; 2. Fresh air preheating system; 21. Fresh air preheater; 211. Fresh air inlet pipe; 212. Fresh air outlet pipe; 22. Fresh air cylinder; 23. Discharge valve; 3. Process water preheating system; 31. Heat exchanger; 32. Raw water heat exchange pipe; 321. Raw water inlet pipe; 322. Temperature sensor; 33. Condensate water heat exchange pipe; 34. Three-way regulating valve; 35. Raw water switch valve; 36. Raw water discharge pipe; 361. Discharge valve; 37. Temperature display; 38. Sailor valve; 4. Low-temperature process raw water; 5. Process water preheating tank; 6. Low-temperature condensate water tank; 7. Process water tank; 8. Floor drain; 9. Component to be heated. Specific embodiments

[0019] The following is a further detailed description of the present utility model in conjunction with the attached Figure 1-2 drawings.

[0020] As Figure 1 shown in 2 figures, a condensate water energy-saving system includes a condensate water tank 1. A condensate water inlet pipe 11 for collecting high-temperature condensate water in the production line is provided at the upper part of the condensate water tank 1. A condensate water outlet pipe 12 is provided at the bottom of the condensate water tank 1. The condensate water outlet pipe 12 is connected to a condensate water pump 121. The outlet of the condensate water pump 121 is connected to a fresh air preheating system 2 for transferring the waste heat in the high-temperature condensate water to heat the component to be heated 9.

[0021] The fresh air preheating system 2 includes a fresh air preheater 21 and a fresh air cylinder 22 outside the fresh air preheater 21. The bottom of the fresh air preheater 21 is connected to a fresh air inlet pipe 211. The upper part of the fresh air preheater 21 is connected to a fresh air outlet pipe 212. The outlet of the condensate water pump 121 is connected to the fresh air inlet pipe 211. The fresh air outlet pipe 212 is connected to a process water preheating system 3. In order to facilitate the maintenance of the fresh air preheater 21, manual stop valves are connected to the outlets of both the fresh air inlet pipe 211 and the fresh air outlet pipe 212.

[0022] The process water preheating system 3 includes a heat exchanger 31, a raw water heat exchange pipe 32, a condensate heat exchange pipe 33, and a three-way regulating valve 34. The raw water heat exchange pipe 32 and the condensate heat exchange pipe 33 are both fixedly installed inside the heat exchanger 31. The two ends of the raw water heat exchange pipe 32 and the two ends of the condensate heat exchange pipe 33 respectively pass through the outer wall of the heat exchanger 31, and the raw water heat exchange pipe 32 and the condensate heat exchange pipe 33 are respectively hermetically connected to the outer wall of the heat exchanger 31. The heat exchanger 31 can be in the form of a plate heat exchanger or the like.

[0023] The inlet of the raw water heat exchange pipe 32 is connected to a raw water inlet pipe 321 for conveying low-temperature process raw water 4, and the outlet of the raw water heat exchange pipe 32 is connected to a process water preheating tank 5. The inlet of the condensate heat exchange pipe 33 is connected to the first outlet of the three-way regulating valve 34, the inlet of the three-way regulating valve 34 is connected to a fresh air outlet pipe 212, and the outlet of the condensate heat exchange pipe 33 and the second outlet of the three-way regulating valve 34 are both connected to a low-temperature condensate pool 6. The outlet of the raw water heat exchange pipe 32 is connected to a temperature sensor 322, and both the temperature sensor 322 and the three-way regulating valve 34 are electrically connected to a controller.

[0024] In this embodiment, a high and low continuous liquid level gauge 13 is provided inside the condensate tank 1. The lower part of the condensate tank 1 is connected to a high liquid level switch valve 14, and the outlet of the high liquid level switch valve 14 is connected to the low-temperature condensate pool 6. The high and low continuous liquid level gauge 13, the high liquid level switch valve 14, and the condensate pump 121 are electrically connected to the controller. The high and low continuous liquid level gauge 13 monitors the liquid level height inside the condensate tank 1. When the liquid level inside the condensate tank 1 reaches the high point of the high and low continuous liquid level gauge 13, the controller controls the high liquid level switch valve 14 to open, and discharges the high-temperature condensate inside the condensate tank 1 to the low-temperature condensate pool 6. When the liquid level inside the condensate tank 1 reaches the low point of the high and low continuous liquid level gauge 13, the controller controls the high liquid level switch valve 14 to close.

[0025] The bottom of the condensate tank 1 is connected to a maintenance valve 15, and the top of the condensate tank 1 is connected to an overflow pipe 16. The outlets of the maintenance valve 15 and the overflow pipe 16 are both connected to a floor drain 8. When the high and low continuous liquid level gauge 13 or the high liquid level switch valve 14 fails, the high-temperature condensate inside the condensate tank 1 can flow into the floor drain 8 through the overflow pipe 16. When it is necessary to perform maintenance on the condensate tank 1, the maintenance valve 15 can be opened to empty the condensate inside the condensate tank 1 to the floor drain 8.

[0026] One side of the fresh air duct 22 is an outdoor fresh air inlet, and the other side of the fresh air duct 22 is a fresh air outlet. The component to be heated 9 is arranged at the fresh air outlet of the fresh air duct 22. The component to be heated 9 can be a drying furnace, and the high-temperature fresh air discharged through the fresh air outlet provides heat energy for the drying furnace.

[0027] In another embodiment, a plurality of fresh air preheaters 21 are provided in the fresh air duct 22. The fresh air inlet pipes 211 of the plurality of fresh air preheaters 21 are connected in parallel and connected to the outlet of the condensate pump 121; the fresh air outlet pipes 212 of the plurality of fresh air preheaters 21 are connected in parallel and connected to the inlet of the three-way regulating valve 34. The plurality of fresh air preheaters 21 are connected in parallel, which improves the fresh air heat exchange amount of the fresh air preheating system 2 per unit time.

[0028] A raw water shut-off valve 35 is connected to the raw water inlet pipe 321. A raw water discharge pipe 36 is connected between the inlet of the raw water shut-off valve 35 and the low-temperature process raw water 4. A discharge valve 361 is connected to the raw water discharge pipe 36. The outlet of the raw water discharge pipe 36 is connected to the process water tank 7. A temperature display 37 is connected to the raw water discharge pipe 36. The temperature of the low-temperature process raw water 4 can be viewed through the temperature display 37. Since the temperature difference of the low-temperature process raw water 4 is relatively large in winter and summer during actual use, according to the seasonal characteristics, when the low-temperature process raw water 4 does not need to be heated, that is, when it reaches 15 °C, the discharge valve 361 is manually opened and the raw water shut-off valve 35 is closed. The low-temperature process raw water 4 is sent to the process water tank 7 through the raw water discharge pipe 36 for production water use.

[0029] In order to improve the reliability of system operation, in one embodiment, three condensate pumps 121 are connected in parallel to the condensate outlet pipe 12. The inlet and outlet of each condensate pump 121 are respectively connected to a shut-off valve 122, and a check valve 123 is connected between the outlet of each condensate pump 121 and the corresponding shut-off valve 122. When one condensate pump 121 fails, one of the other two condensate pumps 121 can be started.

[0030] A discharge valve 23 is connected to the fresh air inlet pipe 211. The outlet of the discharge valve 23 is connected to the floor drain 8. When the system is deactivated due to low outdoor temperature in winter, the discharge valve 23 can be opened to discharge the condensate in the fresh air preheater 21 to the floor drain 8.

[0031] The outlet of the condensate heat exchange pipe 33 is connected to a water outlet manual valve 38. When installation and maintenance of the temperature sensor 322 are required, the water outlet manual valve 38 at the outlet of the raw water heat exchange pipe 32 can be closed.

[0032] The working process of the present utility model is as follows:

[0033] The high-temperature condensate water from the factory enters the condensate tank 1 through the condensate inlet pipe 11. When the liquid level of the condensate tank 1 reaches the high liquid level, the controller controls the high liquid level shut-off valve 14 to start, and the high-temperature condensate water in the condensate tank 1 enters the low-temperature condensate water tank 6; when the liquid level of the condensate tank 1 reaches the low liquid level, the controller controls the high liquid level shut-off valve 14 to close.

[0034] When the system is working, start the condensate pump 121. The high-temperature condensate water is sent through the condensate water outlet pipe 12 to the fresh air preheater 21. The outdoor fresh air enters through the inlet of the fresh air duct 22 and exchanges heat with the fresh air preheater 21. The preheated high-temperature fresh air is transmitted through the outlet of the fresh air duct 22 to the component 9 to be heated.

[0035] The medium-temperature condensate water flowing out of the fresh air outlet water pipe 212 flows through the three-way regulating valve 34. The controller adjusts and controls the proportion of the medium-temperature condensate water flowing through the three-way regulating valve 34 according to the process water temperature detected by the temperature sensor 322 flowing out of the raw water heat exchange pipe 32. A part of the medium-temperature condensate water enters the condensate water heat exchange pipe 33 in the heat exchanger 31 through the first outlet of the three-way regulating valve 34, and another part of the medium-temperature condensate water enters the low-temperature condensate water tank 6 through the second outlet of the three-way regulating valve 34; the low-temperature process raw water 4 enters the raw water heat exchange pipe 32 in the heat exchanger 31 through the raw water inlet pipe 321 and exchanges heat with the medium-temperature condensate water in the condensate water heat exchange pipe 33. The preheated process raw water flowing out of the raw water heat exchange pipe 32 enters the process water preheating tank 5.

[0036] When it is necessary to operate the component 9 to be heated, such as when the drying furnace needs to operate, the condensate pump 121 sends high-temperature condensate water at about 90 °C to the fresh air preheater 21 in the fresh air preheating system 2 to preheat the outdoor fresh air entering the fresh air duct 22. The medium-temperature condensate water discharged from the fresh air preheater 21 is about 60 °C. There is a drain valve 23 on the fresh air inlet pipe 211 in the fresh air preheating system 2. In order to avoid intermittent discontinuous production and freezing during shutdown when the outdoor temperature is lower than 0 °C in winter, when the outdoor temperature is lower than 0 °C in winter or during shutdown, all the condensate water in the fresh air preheater 21 and the pipeline is discharged to the floor drain 8 through the drain valve 23 to prevent the fresh air preheater 21 from freezing.

[0037] The medium-temperature condensate water at about 60 °C flowing out of the fresh air preheating system 2 enters the process water preheating system 3. The controller adjusts and controls the proportion of the condensate water flowing through the three-way regulating valve 34 according to the condensate water temperature detected by the temperature sensor 322. The temperature required for the production process water is usually about 15 °C. When the temperature of the low-temperature process raw water 4 is lower than 15 °C, the controller controls the flow direction of the medium-temperature condensate water flowing through the three-way regulating valve 34 through the temperature information of the temperature sensor 322, that is, adjusts the flow direction and proportion of the medium-temperature condensate water flowing through the first outlet and the second outlet of the three-way regulating valve 34; the medium-temperature condensate water passes through the first outlet of the three-way regulating valve 34 and exchanges heat with the low-temperature process raw water in the raw water heat exchange pipe 32 through the condensate water heat exchange pipe 33. The preheated low-temperature process raw water enters the process water preheating tank 5. The process water in the process water preheating tank 5 can be heated by steam to adjust the final temperature to 15 °C to reach the temperature required for production; the medium-temperature condensate water is discharged after heat exchange through the raw water heat exchange pipe 32 through the first outlet of the three-way regulating valve 34. At this time, the temperature of the low-temperature condensate water is about 40 °C and is discharged to the low-temperature condensate water tank 6.

[0038] The embodiments of this specific implementation manner are all preferred embodiments of the present utility model, and do not limit the protection scope of the present utility model accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present utility model shall be covered within the protection scope of the present utility model.

Claims

1. A condensate water energy saving system, comprising a condensate water tank, characterized in that: A condensate inlet pipe is provided at the top of the condensate tank, and a condensate outlet pipe is provided at the bottom of the condensate tank. The condensate outlet pipe is connected to a condensate pump, and the outlet of the condensate pump is connected to a fresh air preheating system; the fresh air preheating system comprises a fresh air preheater and a fresh air duct outside the fresh air preheater, the fresh air preheater is provided with a fresh air inlet pipe and a fresh air outlet pipe, the fresh air inlet pipe is connected to the outlet of the condensate pump, and the fresh air outlet pipe is connected to a process water preheating system; the process water preheating system comprises a heat exchanger, a raw water heat exchange pipe, a condensate heat exchange pipe and a three-way regulating valve, the raw water heat exchange pipe and the condensate heat exchange pipe are both fixedly installed in the heat exchanger, and the raw water heat exchange pipe The two ends of the heat exchange pipe and the two ends of the condensed water heat exchange pipe pass through the outer wall of the heat exchanger respectively, the raw water heat exchange pipe and the condensed water heat exchange pipe are respectively sealed and connected to the outer wall of the heat exchanger, the inlet of the raw water heat exchange pipe is connected to the raw water inlet pipe for conveying low-temperature process raw water, the outlet of the raw water heat exchange pipe is connected to the process water preheating tank, the inlet of the condensed water heat exchange pipe is connected to the first outlet of the three-way regulating valve, the inlet of the three-way regulating valve is connected to the fresh air outlet pipe, the outlet of the condensed water heat exchange pipe and the second outlet of the three-way regulating valve are both connected to the low-temperature condensed water tank; the outlet of the raw water heat exchange pipe is connected to the temperature sensor, and the temperature sensor and the three-way regulating valve are both electrically connected to the controller.

2. The condensate water energy saving system according to claim 1, characterized in that: A high and low continuous liquid level gauge is provided in the condensate water tank, the lower part of the condensate water tank is connected to a high liquid level switch valve, and the outlet of the high liquid level switch valve is connected to a low-temperature condensate water pool; the high and low continuous liquid level gauge, the high liquid level switch valve and the condensate water pump are electrically connected to a controller.

3. The condensate water energy saving system according to claim 1, characterized in that: The bottom of the condensate tank is connected to a check valve, the top of the condensate tank is connected to an overflow pipe, and the outlet of the check valve and the outlet of the overflow pipe are both connected to a floor drain.

4. The condensed water energy saving system according to claim 1, characterized in that: One side of the fresh air duct is a fresh air inlet, and the other side of the fresh air duct is a fresh air outlet. The fresh air outlet of the fresh air duct is provided with a component to be heated.

5. The condensed water energy saving system according to claim 1, characterized in that: A plurality of fresh air preheaters are arranged in the fresh air duct, and the fresh air inlet pipes of the plurality of fresh air preheaters are connected in parallel and connected to the outlet of the condensate pump; the fresh air outlet pipes of the plurality of fresh air preheaters are connected in parallel and connected to the inlet of the three-way regulating valve.

6. The condensate water energy saving system according to claim 1, characterized in that: The raw water inlet pipe is connected to a raw water switch valve, a raw water discharge pipe is connected between the inlet of the raw water switch valve and the low-temperature process raw water, the raw water discharge pipe is connected to a discharge valve, the outlet of the raw water discharge pipe is connected to a process water tank, and a temperature display is connected to the raw water discharge pipe.

7. The condensate water energy saving system according to claim 1, characterized in that: The condensate outlet pipe is connected in parallel with three condensate pumps, the inlet and outlet of each condensate pump are respectively connected to a switch valve, and a one-way valve is connected between the outlet of each condensate pump and the corresponding switch valve.

8. The condensed water energy saving system according to claim 1, characterized in that: The fresh air inlet pipe is connected to a discharge valve, and the outlet of the discharge valve is connected to a floor drain.

9. The condensed water energy saving system according to claim 1, characterized in that: The outlet of the condensate heat exchange pipe is connected to the water outlet manual valve.

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