Waste water heat energy utilization energy-saving device

Abstract

The invention discloses a waste water heat energy utilization energy-saving device which comprises a storage device and a heat exchange device, the storage device comprises a waste water storage tank and a water suction pump, the interior of the waste water storage tank is used for storing low-temperature waste water, the waste water storage tank is provided with a water inlet, a first water outlet and a second water outlet, and the first water outlet is connected with a waste water evaporation feeding groove; the water pumps are arranged at the first water outlet and the second water outlet; the heat exchange device comprises a steam-water separator, a first heat exchanger and a second heat exchanger, the air inlet end of the first heat exchanger is connected with a hot steam source, the air outlet end of the first heat exchanger is communicated with the steam-water separator, the water inlet end of the first heat exchanger is connected with the second water outlet through the water suction pump, and the water outlet end of the first heat exchanger is connected with the water inlet; the invention aims to solve the problem of energy waste caused by consumption of more energy to heat waste water due to low initial temperature of the waste water when the waste water evaporation device evaporates the waste water in the prior art.

Description

Technical Field

[0001] The invention relates to the technical field of thermal energy utilization, and in particular to a wastewater thermal energy utilization energy-saving device. Background Art

[0002] Wastewater evaporation treatment technology is of great significance in environmental protection and resource recovery. With the acceleration of industrialization, the amount of wastewater discharged has increased significantly, posing a serious threat to water resources and the ecological environment. Wastewater evaporation technology vaporizes the water in the wastewater by heating, leaving dissolved solids or solutes. Common equipment includes multiple-effect evaporators, heat pump evaporators, and evaporation crystallizers. Although this technology requires a lot of thermal energy, modern technology has made many improvements in energy efficiency, such as using waste heat and adopting heat pump technology to reduce energy demand. Wastewater evaporation technology is widely used in industries such as chemical, pharmaceutical, food processing, electroplating and textile, and strict regulations and standards in various countries have promoted the development and improvement of technology. With the application of new materials and automation control technology, the performance and treatment efficiency of wastewater evaporation equipment have been continuously improved, effectively reducing pollutant emissions, achieving efficient utilization of resources, and making important contributions to environmental protection and sustainable development.

[0003] The invention patent with application number: CN201810202714.9 and publication number: CN108249499A (hereinafter referred to as "prior art 1") discloses a method and device for low-temperature evaporation and concentration of high-salt wastewater using high-temperature industrial wastewater. The method is that high-temperature industrial wastewater enters an evaporator, and the evaporator is in a vacuum environment. The high-temperature industrial wastewater generates low-pressure water vapor through vacuum evaporation under a vacuum environment. The low-pressure water vapor enters a condenser directly or through a supercharger. In the condenser, the low-pressure water vapor is in direct contact with the high-salt wastewater to perform mixed heat exchange. The condenser is also in a vacuum environment. After the high-temperature and high-salt wastewater is formed, it evaporates again. The evaporated water vapor is discharged and condensed into clean water. The high-salt wastewater with reduced water volume and increased salt content after evaporation is discharged from the condenser. The device includes an evaporator, a condenser and a vacuum pump. The evaporator and the condenser are both connected to the vacuum pump, and the steam discharge port on the evaporator is connected to the condenser.

[0004] The specification of prior art 1 discloses a method and device for low-temperature evaporation and concentration of high-salt wastewater using high-temperature industrial wastewater, which uses waste heat from the enterprise's high-temperature wastewater to evaporate and concentrate the high-salt wastewater. However, in actual applications, due to the low initial temperature of the wastewater, directly evaporating the wastewater will cause a waste of energy. Summary of the invention

[0005] The present invention provides an energy-saving device for utilizing wastewater heat energy, aiming to solve the problem that the wastewater evaporation device in the prior art consumes more energy to heat the wastewater due to the low initial temperature of the wastewater when evaporating the wastewater, resulting in energy waste.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A wastewater heat energy utilization energy-saving device comprises: a storage device and a heat exchange device, the storage device comprises: a wastewater storage tank and a water pump, the wastewater storage tank is used to store low-temperature wastewater, the wastewater storage tank is provided with a water inlet, a first water outlet and a second water outlet, the first water outlet is connected to a wastewater evaporation feed tank, and the first water outlet and the second water outlet are both provided with the water pump;

[0008] The heat exchange device comprises: a steam-water separator, a first heat exchanger and a second heat exchanger, the air inlet end of the first heat exchanger is connected to the hot steam source, the air outlet end is communicated with the steam-water separator, the water inlet end of the first heat exchanger is connected to the second water outlet through the water pump, and the water outlet end is connected to the water inlet; the two water inlet ends on the second heat exchanger are respectively connected to the electrolytic cooling water source and the second water outlet, and the two water discharge ends are respectively connected to the cooling water pool and the wastewater storage tank;

[0009] The water inlet end of the second heat exchanger connected to the electrolysis cooling water source is connected to the drainage end connected to the cold water tank, and the other water inlet end is connected to the other drainage end.

[0010] Furthermore, there are several wastewater storage tanks, which are connected by connecting pipes, and the first water outlet and the water inlet are located on the leftmost wastewater storage tank, and the second water outlet is located on the rightmost wastewater storage tank.

[0011] Furthermore, the first water outlet and the second water outlet are connected to the water pump via a valve respectively.

[0012] Furthermore, the first heat exchanger and the second heat exchanger are both plate heat exchangers.

[0013] Furthermore, the first heat exchanger is provided with two air inlets, and both air inlets are connected to the hot steam source.

[0014] Furthermore, the connecting pipe is a flange structure.

[0015] Furthermore, the wastewater storage tank is also provided with a water inlet pipe, which is used to be connected to a low-temperature wastewater source.

[0016] Furthermore, a heat preservation device is arranged outside the wastewater storage tank, and the heat preservation device is used to keep the wastewater inside the wastewater storage tank warm.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention mainly includes a storage device and a heat exchange device. In actual use, the staff discharges low-temperature wastewater into the wastewater storage tank, and then drives the water pump of the second water outlet to start. The water pump pumps the low-temperature wastewater into the water inlet end and the water inlet end of the first heat exchanger and the second heat exchanger respectively, and then controls the hot steam source to pass hot steam into the first heat exchanger and the air inlet end. The hot steam exchanges heat with the low-temperature wastewater, and the wastewater is heated and circulated to the wastewater storage tank. At the same time, the hot steam is cooled to form warm steam and high-temperature cooling water. The warm steam passes through the first heat exchanger and the air inlet end. The gas outlet end of the first heat exchanger is discharged to the steam-water separator for treatment, and the high-temperature cooling water enters the second heat exchanger through the other water inlet end of the second heat exchanger. The high-temperature cooling water and the low-temperature wastewater are heat exchanged in the second heat exchanger. After the heat exchange is completed, the cooling water is discharged into the cooling water pool, and the wastewater is heated and circulated to the wastewater storage tank. The above operation is repeated continuously, thereby increasing the initial temperature of the wastewater in the wastewater storage tank. In this way, when evaporating the wastewater, the time for heating the wastewater can be reduced, and the wastewater can be evaporated with less energy, saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the connection relationship between the heat preservation device of the present invention and the wastewater storage tank.

[0022] In the figure, 101-wastewater storage tank, 102-water pump, 103-water inlet, 104-first water outlet, 105-second water outlet, 107-steam-water separator, 108-first heat exchanger, 109-second heat exchanger, 110-connecting pipe, 111-water inlet pipe, 112-insulation cover, 113-external coil, 114-heating rod. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with embodiments, which are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, other embodiments obtained by ordinary technicians in the field without creative work are all within the scope of protection of the present invention.

[0024] See also Figure 1-Figure 2As shown, this embodiment discloses a wastewater heat energy utilization energy-saving device, including: a storage device and a heat exchange device, the storage device includes: a wastewater storage tank 101 and a water pump 102, the wastewater storage tank 101 is used to store low-temperature wastewater, the wastewater storage tank 101 has a water inlet 103, a first water outlet 104 and a second water outlet 105, the first water outlet 104 is connected to the wastewater evaporation feed tank, and the first water outlet 104 and the second water outlet 105 are both provided with the water pump 102;

[0025] The heat exchange device includes: a steam-water separator 107, a first heat exchanger 108 and a second heat exchanger 109. The air inlet end of the first heat exchanger 108 is connected to the hot steam source, and the air outlet end is communicated with the steam-water separator 107. The water inlet end of the first heat exchanger 108 is connected to the second water outlet 105 through the water pump 102, and the water outlet end is connected to the water inlet 103; the two water inlet ends of the second heat exchanger 109 are respectively connected to the electrolytic cooling water source and the second water outlet 105, and the two water discharge ends are respectively connected to the cooling water pool and the wastewater storage tank 101;

[0026] The water inlet end of the second heat exchanger 109 connected to the electrolytic cooling water source is connected to the drainage end connected to the cold water tank, and the other water inlet end is connected to the other drainage end;

[0027] The present invention mainly includes a storage device and a heat exchange device. In actual use, the staff discharges low-temperature wastewater into the wastewater storage tank 101, and then drives the water pump 102 of the second water outlet 105 to start. The water pump 102 pumps the low-temperature wastewater into the water inlet end and the water inlet end of the first heat exchanger 108 and the second heat exchanger 109 respectively, and then controls the hot steam source to pass hot steam to the first heat exchanger 108 and the air inlet end on it. The hot steam exchanges heat with the low-temperature wastewater, and the wastewater is heated and circulated to the wastewater storage tank 101. At the same time, the hot steam is cooled to form warm steam and high-temperature cooling water. The warm steam passes through the first heat exchanger 108 and the air inlet end on it. The gas is discharged from the gas outlet of the first heat exchanger 108 to the steam-water separator 107 for treatment, and the high-temperature cooling water enters the second heat exchanger 109 through the other water inlet of the second heat exchanger 109. The high-temperature cooling water and the low-temperature wastewater exchange heat in the second heat exchanger 109. After the heat exchange is completed, the cooling water is discharged into the cooling water pool, and the wastewater is heated and circulated to the wastewater storage tank 101. The above operation is repeated, thereby increasing the initial temperature of the wastewater in the wastewater storage tank 101. In this way, when evaporating the wastewater, the time for heating the wastewater can be reduced, and the wastewater can be evaporated with less energy, thereby saving energy.

[0028] In some embodiments, there are several wastewater storage tanks 101, and the several wastewater storage tanks 101 are connected by a connecting pipe 110. The first water outlet 104 and the water inlet 103 are located on the leftmost wastewater storage tank 101, and the second water outlet 105 is located on the rightmost wastewater storage tank 101.

[0029] In actual use, providing a plurality of interconnected wastewater storage tanks 101 can increase the capacity of the wastewater storage tank 101, thereby increasing the initial temperature of more wastewater and further reducing energy consumption.

[0030] In some embodiments, the first water outlet 104 and the second water outlet 105 are connected to the water pump 102 via a valve respectively.

[0031] In some embodiments, the first heat exchanger 108 and the second heat exchanger 109 are both plate heat exchangers.

[0032] In actual use, the reason for using plate heat exchangers is that the heat exchange rate of plate heat exchangers is higher, which can further save energy for wastewater evaporation.

[0033] In some embodiments, the first heat exchanger 108 has two air inlets, and both air inlets are connected to a hot steam source.

[0034] In actual use, the purpose of providing two air inlets is to allow hot steam to pass into the efficiency clamp of the first heat exchanger 108, thereby improving the efficiency of wastewater heat exchange.

[0035] In some embodiments, the connecting pipe 110 is a flange structure.

[0036] In actual use, the connecting pipe 110 of the flange structure can be more easily disassembled from the wastewater storage tank 101 and has better sealing performance.

[0037] In some embodiments, the wastewater storage tank 101 further has a water inlet pipe 111, and the water inlet pipe 111 is used to connect to a low-temperature wastewater source.

[0038] In some embodiments, the inventors have found that in cold weather, the heated wastewater will cool down in the wastewater storage tank 101 due to weather factors, which will increase the energy consumption of wastewater evaporation; according to this improvement idea, Figure 2As shown, an insulation device is arranged outside the wastewater storage tank 101, and the insulation device is used to insulate the wastewater inside the wastewater storage tank 101; the insulation device includes an insulation cover 112, an outer coil 113 and a heating rod 114, the heating rod 114 is installed at the center position inside the wastewater storage tank 101, the insulation cover 112 is installed on the outer wall of the wastewater storage tank 101, the outer coil 113 is installed inside the insulation cover 112 and is fixedly connected to the outer wall of the wastewater storage tank 101, the inlet of the outer coil 113 is connected to the outlet end of the hot steam source, and the outlet end of the outer coil 113 is connected to the steam-water separator 107.

[0039] During actual use, the hot steam source circulates hot steam into the outer coil 113, so that the wastewater in the wastewater storage tank 101 is fully insulated, and the exhausted hot steam flows into the steam-water separator 107 for treatment; the advantage of this arrangement is that the temperature of the wastewater in the wastewater storage tank 101 can be guaranteed in cold weather, so that energy consumption can be reduced when the subsequent wastewater evaporates.

[0040] In the description of the present invention, it is necessary to understand that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "two ends", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0041] In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include at least one of such features.

[0042] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wastewater heat energy utilization energy-saving device, characterized in that: include: A storage device, comprising: a wastewater storage tank (101) and a water pump (102), wherein the wastewater storage tank (101) is used to store low-temperature wastewater, the wastewater storage tank (101) is provided with a water inlet (103), a first water outlet (104) and a second water outlet (105), the first water outlet (104) is connected to a wastewater evaporation feed tank, and the first water outlet (104) and the second water outlet (105) are both provided with the water pump (102); and The heat exchange device comprises: a steam-water separator (107), a first heat exchanger (108) and a second heat exchanger (109); the air inlet end of the first heat exchanger (108) is connected to a hot steam source, and the air outlet end is in communication with the steam-water separator (107); the water inlet end of the first heat exchanger (108) is connected to a second water outlet (105) through the water pump (102), and the water outlet end is connected to the water inlet (103); the two water inlet ends of the second heat exchanger (109) are respectively connected to an electrolytic cooling water source and the second water outlet (105), and the two water discharge ends are respectively connected to a cooling water pool and a wastewater storage tank (101); The water inlet end of the second heat exchanger (109) connected to the electrolysis cooling water source is connected to the drainage end connected to the cold water tank, and the other water inlet end is connected to the other drainage end.

2. A wastewater heat energy utilization energy-saving device according to claim 1, characterized in that: There are a plurality of wastewater storage tanks (101), which are connected via a connecting pipe (110); a first water outlet (104) and a water inlet (103) are located on the leftmost wastewater storage tank (101), and a second water outlet (105) is located on the rightmost wastewater storage tank (101).

3. The wastewater heat energy utilization energy-saving device according to claim 1 is characterized in that: The first water outlet (104) and the second water outlet (105) are connected to the water pump (102) via a valve respectively.

4. The wastewater heat energy utilization energy-saving device according to claim 1, characterized in that: The first heat exchanger (108) and the second heat exchanger (109) are both plate heat exchangers.

5. The wastewater heat energy utilization energy-saving device according to claim 1 is characterized in that: The first heat exchanger (108) has two air inlets, both of which are connected to a hot steam source.

6. The wastewater heat energy utilization energy-saving device according to claim 1 is characterized in that: The connecting pipe (110) is a flange structure.

7. The wastewater heat energy utilization energy-saving device according to claim 1 is characterized by: The wastewater storage tank (101) is also provided with a water inlet pipe (111), and the water inlet pipe (111) is used to be connected to a low-temperature wastewater source.

8. The wastewater heat energy utilization energy-saving device according to claim 1 is characterized by: A heat preservation device is arranged outside the wastewater storage tank (101), and the heat preservation device is used to keep the wastewater inside the wastewater storage tank (101) warm.

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