Waste water waste heat recovery device
By installing a combination of water tanks, heat exchangers, and absorption heat pumps in the steel plant, the problem of underutilization of waste heat from slag flushing water has been solved, achieving cascade utilization and efficient energy recovery, and reducing heating costs.
Patent Information
- Application Number
- CN202423114212.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-12-17
AI Technical Summary
In existing technologies, steel mills fail to fully exploit the residual heat value when treating slag flushing water, resulting in energy waste and additional energy consumption.
A wastewater waste heat recovery device is adopted, which uses a water tank, heat exchanger and absorption heat pump to preheat the return water of the heating system with the heat of the slag flushing water, and then further heats it in the absorption heat pump. Combined with waste steam as a heat source, it realizes cascade utilization.
It improves energy efficiency, reduces energy waste, lowers heating costs, and supports energy conservation, emission reduction, and sustainable development.
Smart Images
Figure CN223649501U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of waste heat recovery technology, specifically to a wastewater waste heat recovery device. Background Technology
[0002] During steel plant production, a large amount of slag-flushing water with a certain temperature is generated. This slag-flushing water is produced during steel smelting to cool blast furnace slag, and its temperature typically reaches around 80℃. This high-temperature slag-flushing water contains considerable thermal energy. However, for a long time, most steel plants have failed to fully exploit its energy value when treating slag-flushing water, often simply cooling it before discharge or reusing it after cooling. This not only results in a significant waste of energy but may also consume additional energy resources during the cooling process. With the increasing prominence of energy shortages and ever-increasing environmental protection requirements, the efficient utilization of energy and waste heat recovery in the industrial sector have become a focus of attention.
[0003] In the exploration of comprehensive energy utilization, heat pump technology has gradually become an effective energy-saving method. Heat pumps can utilize low-grade heat sources and, by consuming a certain amount of electrical energy or other forms of energy, transfer heat from a low-temperature heat source to a high-temperature heat source, thereby achieving a heating function.
[0004] If the waste heat from slag flushing water in steel plants can be used to provide heat for heating systems, it will be a highly promising way to recover and utilize energy. Utility Model Content
[0005] The purpose of this invention is to provide a wastewater waste heat recovery device to solve the problem that in the existing technology, most steel plants fail to fully explore the energy value of slag flushing water when treating it. They often simply cool it and discharge it or reuse it after cooling. This not only causes a lot of energy waste, but may also consume additional energy resources during the cooling process.
[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0007] A wastewater heat recovery device includes a water tank, a heat exchanger, and an absorption heat pump. High-temperature water discharged from the water tank passes sequentially through the first flow channel of the heat exchanger and the evaporator of the absorption heat pump. The generator of the absorption heat pump is connected to a steam pipeline. The inlet of the second flow channel of the heat exchanger is connected to a return water pipeline. The outlet of the second flow channel is connected to the condenser of the absorption heat pump through a connecting water pipe. The outlet of the condenser is connected to a water supply pipeline.
[0008] A further technical solution is to install a filter between the water tank and the heat exchanger. The water tank is connected to the inlet of the filter through a first water pipe, and the outlet of the filter is connected to the first flow channel of the heat exchanger through a second water pipe.
[0009] A further technical solution is to install a filter screen at the connection between the water tank and the first water pipe.
[0010] A further technical solution is that the filter includes a housing and a first filter tube installed inside the housing. The two ends of the first filter tube are connected to a first water pipe and a second water pipe, respectively. A first filter screen is installed inside the first filter tube.
[0011] A further technical solution involves installing a second filter tube inside the outer casing. The two ends of the second filter tube are connected to the first water pipe and the second water pipe, respectively. A second filter screen is installed inside the second filter tube. A first drain pipe is connected between the first filter screen and the first water pipe, and a first valve is installed on the first drain pipe. A second valve is installed between the first drain pipe and the first water pipe. A second drain pipe is connected between the second filter screen and the first water pipe, and a third valve is installed on the second drain pipe. A fourth valve is installed between the second drain pipe and the first water pipe.
[0012] A further technical solution is that a fifth valve is installed between the first filter pipe and the second water pipe; and a sixth valve is installed between the second filter pipe and the second water pipe.
[0013] A further technical solution is that the first valve is a first electric valve, the second valve is a second electric valve, the third valve is a third electric valve, the fourth valve is a fourth electric valve, the fifth valve is a fifth electric valve, and the sixth valve is a sixth electric valve.
[0014] A further technical solution is to provide an inspection port that runs through the inside and outside of the casing, as well as an inspection door for closing the inspection port.
[0015] Compared with existing technologies, the beneficial effects of this utility model are as follows: 1. If the flushing water is directly introduced into the absorption heat pump as a heat source to heat the water in the return water pipeline, the energy value of the flushing water cannot be maximized. Considering that the return water temperature of the heating network in the heating system is relatively low, before the flushing water enters the absorption heat pump, the heat of the flushing water is used to preheat the return water of the heating network through a heat exchanger. Then, the flushing water enters the heat pump for further heating to the temperature required for heating. This can realize the cascade utilization of the energy of the flushing water. This method can not only more fully recover the waste heat of the flushing water, improve energy utilization efficiency, and reduce energy waste, but also reduce heating costs and reduce dependence on traditional energy sources, providing strong support for achieving energy conservation and emission reduction goals and sustainable development strategies; 2. In addition to the flushing water, steel plants also generate a lot of waste steam. These waste steam are connected to the generator in the absorption heat pump through steam pipelines as one of the heat sources, which can further heat the hot water entering the supply water pipeline. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the overall framework of a wastewater waste heat recovery device according to the present invention.
[0017] Figure 2 This is a schematic diagram of the water tank, filter, and heat exchanger of a wastewater waste heat recovery device according to this utility model.
[0018] Figure 3 This is a schematic diagram of the filter structure of a wastewater waste heat recovery device according to the present invention.
[0019] Icons: 1-Water tank, 2-Heat exchanger, 3-Absorption heat pump, 4-Steam pipe, 5-Return water pipe, 6-Supply water pipe, 7-Filter, 8-First water pipe, 9-Second water pipe, 10-Outer shell, 11-First filter pipe, 12-First filter screen, 13-Second filter pipe, 14-Second filter screen, 15-First drain pipe, 16-First valve, 17-Second valve, 18-Second drain pipe, 19-Third valve, 20-Fourth valve, 21-Fifth valve, 22-Sixth valve. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0021] Figures 1 to 3 The following is an embodiment of the present invention.
[0022] Example:
[0023] A wastewater heat recovery device includes a water tank 1, a heat exchanger 2, and an absorption heat pump 3. High-temperature water discharged from the water tank 1 passes sequentially through the first flow channel of the heat exchanger 2 and the evaporator of the absorption heat pump 3. The generator of the absorption heat pump 3 is connected to a steam pipe 4. The inlet of the second flow channel of the heat exchanger 2 is connected to a return water pipe 5, and the outlet of the second flow channel is connected to the condenser of the absorption heat pump 3 via a connecting water pipe. The outlet of the condenser is connected to a supply water pipe 6. If the flushing water is directly introduced into the absorption heat pump 3 as a heat source to heat the water in the return water pipe 5, the energy value of the flushing water cannot be maximized. Considering that the return water temperature of the heating network in the heating system is relatively low, the flushing water is preheated by the heat exchanger 2 before entering the absorption heat pump 3, utilizing the heat of the flushing water. Then, the flushing water enters the heat pump for further heating to the required heating temperature, thus achieving the cascade utilization of the flushing water's energy. This method not only more fully recovers the waste heat from slag flushing water, improving energy efficiency and reducing energy waste, but also lowers heating costs and reduces reliance on traditional energy sources, providing strong support for achieving energy conservation and emission reduction goals and sustainable development strategies. In addition to slag flushing water, steel plants also generate a significant amount of waste steam. This waste steam is connected to the generator in the absorption heat pump 3 via steam pipeline 4 as one of the heat sources, further heating the hot water entering the water supply pipeline 6. The general workflow of the wastewater heat recovery device is as follows: When the high-temperature water in pool 1 is discharged, its temperature is approximately 80℃. This high-temperature water flows into the first channel of heat exchanger 2 and undergoes a first heat exchange with the return water from the heat network flowing into the second channel of heat exchanger 2. At this time, the high-temperature return water releases heat and decreases to 60℃, while the return water absorbs heat and rises to 70℃. The 60℃ high-temperature water enters the evaporator of the absorption heat pump 3 to heat the working fluid within the absorption heat pump 3, while simultaneously decreasing in temperature to 45℃ before being discharged. This 45℃ high-temperature water can then be returned to pool 1 for reuse or further cooled by other cooling equipment before returning to pool 1 for reuse. The 70℃ return water from the heat network enters the condenser of the absorption heat pump 3 for another heat absorption and temperature increase. After rising to 85℃, it enters the water supply pipeline 6 for heating.
[0024] A filter 7 is installed between the water tank 1 and the heat exchanger 2. The water tank 1 is connected to the inlet of the filter 7 via a first water pipe 8, and the outlet of the filter 7 is connected to the first flow channel of the heat exchanger 2 via a second water pipe 9. Since the water in the water tank 1 contains a large amount of impurities, the filter 7 can filter the high-temperature water entering the heat exchanger 2 and the absorption heat pump 3, preventing impurities from entering the heat exchanger 2 and the absorption heat pump 3 and causing blockage of the flow channels.
[0025] A filter screen is installed at the connection between the water tank 1 and the first water pipe 8. By installing the filter screen, large particles of impurities can be filtered and retained in the water tank 1. This, together with the filter 7, provides double filtration, making it less likely for the high-temperature water entering the heat exchanger 2 and the absorption heat pump 3 to cause flow channel blockage in the heat exchanger 2 and the absorption heat pump 3.
[0026] The filter 7 includes a housing 10 and a first filter tube 11 installed inside the housing 10. The two ends of the first filter tube 11 are connected to a first water pipe 8 and a second water pipe 9, respectively. A first filter screen 12 is provided inside the first filter tube 11. By setting the first filter tube 11 and the first filter screen 12, impurities can be blocked in the first filter tube 11 by the first filter screen 12. When a certain amount is accumulated, the first filter tube 11 can be cleaned.
[0027] A second filter tube 13 is also installed inside the outer casing 10. The two ends of the second filter tube 13 are connected to the first water pipe 8 and the second water pipe 9, respectively. A second filter screen 14 is installed inside the second filter tube 13. A first drain pipe 15 is connected between the first filter screen 12 and the first water pipe 8, and a first valve 16 is installed on the first drain pipe 15. A second valve 17 is installed between the first drain pipe 15 and the first water pipe 8. A second drain pipe 18 is connected between the second filter screen 14 and the first water pipe 8, and a third valve 19 is installed on the second drain pipe 18. A fourth valve 20 is installed between the second drain pipe 18 and the first water pipe 8. This configuration allows for cleaning of either the first filter screen 12 or the second filter screen 14 without interrupting water supply. Specifically, when the filter 7 is in normal use, the first valve 16 and the fourth valve 20 are closed, while one of the second valve 17 and the third valve 19 is simultaneously opened or closed. When the first filter screen 12 needs cleaning, close the second valve 17 and then open the first valve 16. This will cause some of the high-temperature water in the second water pipe 9 to flow back towards the first filter pipe 11, thus backwashing the first filter screen 12. This will remove impurities adsorbed on the first filter screen 12, as well as impurities accumulated between the first filter screen 12 and the second valve 17, through the first drain pipe 15. After cleaning, close the first valve 16 and open the second valve 17. Similarly, when the second filter screen 14 needs cleaning, close the fourth valve 20 and open the third valve 19.
[0028] A fifth valve 21 is installed in the first filter pipe 11 between the first filter screen 12 and the second water pipe 9; a sixth valve 22 is installed in the second filter pipe 13 between the second filter screen 14 and the second water pipe 9. By installing the fifth valve 21, in conjunction with the second valve 17, the flow of high-temperature water on both sides of the first filter screen 12 can be blocked, allowing for the repair or replacement of the first filter screen 12. Similarly, the sixth valve 22, in conjunction with the fourth valve 20, can block the flow of high-temperature water on both sides of the second filter screen 14, allowing for the repair or replacement of the second filter screen 14.
[0029] The first valve 16 is the first electric valve, the second valve 17 is the second electric valve, the third valve 19 is the third electric valve, the fourth valve 20 is the fourth electric valve, the fifth valve 21 is the fifth electric valve, and the sixth valve 22 is the sixth electric valve. This allows for remote control of each valve's opening and closing via a controller, eliminating the need for manual operation.
[0030] The outer casing 10 is provided with an inspection port that extends through the inside and outside, as well as an inspection door for closing the inspection port. By providing the inspection port and the inspection door, it is convenient to maintain the first filter tube 11 and the second filter tube 13.
[0031] Although the present invention has been described herein with reference to several illustrative embodiments, it should be understood that many other modifications and implementations can be devised by those skilled in the art, which will fall within the scope and spirit of the principles disclosed herein. More specifically, various variations and modifications can be made to the components and / or layout of the subject matter combination within the scope of the disclosure, drawings, and claims. Besides variations and modifications to the components and / or layout, other uses will be apparent to those skilled in the art.
Claims
1. A wastewater waste heat recovery device, characterized in that, The system includes a water tank (1), a heat exchanger (2), and an absorption heat pump (3). The high-temperature water discharged from the water tank (1) passes through the first flow channel of the heat exchanger (2) and the evaporator of the absorption heat pump (3) in sequence. The generator of the absorption heat pump (3) is connected to the steam pipeline (4). The inlet of the second flow channel of the heat exchanger (2) is connected to the return water pipeline (5). The outlet of the second flow channel is connected to the condenser of the absorption heat pump (3) through a connecting water pipe. The outlet of the condenser is connected to the water supply pipeline (6).
2. The wastewater waste heat recovery device according to claim 1, characterized in that: A filter (7) is provided between the water tank (1) and the heat exchanger (2). The water tank (1) is connected to the inlet of the filter (7) through a first water pipe (8), and the outlet of the filter (7) is connected to the first flow channel of the heat exchanger (2) through a second water pipe (9).
3. The wastewater waste heat recovery device according to claim 2, characterized in that: A filter screen is provided at the connection between the water tank (1) and the first water pipe (8).
4. The wastewater waste heat recovery device according to claim 2, characterized in that: The filter (7) includes a housing (10) and a first filter tube (11) installed inside the housing (10). The two ends of the first filter tube (11) are connected to the first water pipe (8) and the second water pipe (9) respectively. A first filter screen (12) is provided inside the first filter tube (11).
5. A wastewater waste heat recovery device according to claim 4, characterized in that: The outer casing (10) is also equipped with a second filter tube (13). The two ends of the second filter tube (13) are connected to the first water pipe (8) and the second water pipe (9) respectively. The second filter tube (13) is equipped with a second filter screen (14). The first filter tube (11) is connected to the first drain pipe (15) between the first filter screen (12) and the first water pipe (8). The first drain pipe (15) is equipped with a first valve (16). The first filter tube (11) is equipped with a second valve (17) between the first drain pipe (15) and the first water pipe (8). The second filter tube (13) is connected to the second drain pipe (18) between the second filter screen (14) and the first water pipe (8). The second drain pipe (18) is equipped with a third valve (19). The second filter tube (13) is equipped with a fourth valve (20) between the second drain pipe (18) and the first water pipe (8).
6. The wastewater waste heat recovery device according to claim 5, characterized in that: The first filter pipe (11) is provided with a fifth valve (21) between the first filter screen (12) and the second water pipe (9); the second filter pipe (13) is provided with a sixth valve (22) between the second filter screen (14) and the second water pipe (9).
7. A wastewater waste heat recovery device according to claim 6, characterized in that: The first valve (16) is the first electric valve, the second valve (17) is the second electric valve, the third valve (19) is the third electric valve, the fourth valve (20) is the fourth electric valve, the fifth valve (21) is the fifth electric valve, and the sixth valve (22) is the sixth electric valve.
8. A wastewater waste heat recovery device according to claim 4, characterized in that: The outer casing (10) is provided with an inspection port that runs through the inside and outside, and an inspection door for closing the inspection port.