Hydrothermal flash evaporation device with residual heat recovery

Abstract

This utility model discloses a hydrothermal flash evaporation device with waste heat recovery capability, including a flash tank. A rotating shaft is rotatably installed inside the flash tank. Multiple airflow channels perpendicular to the shaft's axis are arranged sequentially from top to bottom within the rotating shaft. Multiple U-shaped tubes are provided on both sides of the rotating shaft, with each U-shaped tube's two ends connected to two adjacent airflow channels on the upper and lower sides of the rotating shaft, respectively, so that the U-shaped tubes on the left and right sides of the rotating shaft are connected in series along the flow direction of high-temperature steam. An air inlet channel and an air outlet channel are respectively provided at the lower and upper ends of the rotating shaft. The flash tank body also has a water inlet and a water outlet. A first air inlet pipe connected to the air inlet channel is provided at the bottom of the flash tank, and a first air outlet pipe connected to the air outlet channel is provided at the top of the flash tank. This utility model can improve the heat exchange effect within the flash tank and can further exchange heat through a preheating tank. Through two heat exchange processes, energy is fully recovered, reducing heat loss.

Description

Technical Field

[0001] This utility model relates to a hydrothermal flash evaporation device capable of recovering waste heat, belonging to the field of hydrothermal flash evaporation technology for waste heat recovery. Background Technology

[0002] With the increase in sewage volume and treatment rate in my country, the production of sludge is also increasing, placing enormous environmental pressure on cities. Due to the colloidal structure of sludge, organic matter is encapsulated by microbial cells to form flocs, making the sludge difficult to dewater and digest. Hydrothermal treatment can disrupt the colloidal structure of sludge, improving its dewatering and digestibility. After hydrothermal treatment, the material temperature and pressure are relatively high; flash evaporation and flash steam reuse can effectively and energy-efficiently depressurize and cool it.

[0003] The existing flash evaporation devices have the following technical problems: First, the heat exchange between the high-temperature steam and the water to be heated is insufficient, resulting in poor heat exchange effect; Second, the high-temperature steam after heat exchange is still at a very high temperature, and direct discharge results in serious heat loss and low heat exchange efficiency.

[0004] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0005] This invention addresses the shortcomings of the prior art by providing a hydrothermal flash evaporation device capable of recovering waste heat. This device can improve the heat exchange effect in the flash tank and further exchange heat through the preheating tank. Through two heat exchange processes, energy is fully recovered, reducing heat loss.

[0006] To solve the above technical problems, the present invention adopts the following technical solution: A hydrothermal flash evaporation device with waste heat recovery includes a flash tank, a rotating shaft is rotatably installed inside the flash tank, and multiple airflow channels arranged perpendicular to its axis are arranged sequentially from top to bottom inside the rotating shaft. Multiple U-shaped tubes are arranged on both sides of the rotating shaft, and the two ends of the U-shaped tubes are respectively connected to two adjacent airflow channels on the upper and lower sides of the rotating shaft, so that the U-shaped tubes on the left and right sides of the rotating shaft are connected in series along the flow direction of high temperature steam. The lower and upper ends of the rotating shaft are respectively provided with an air inlet channel and an exhaust channel. The body of the flash tank is also provided with a water inlet and a drain outlet. The bottom of the flash tank is provided with a first air inlet pipe connected to the air inlet channel, and the top of the flash tank is provided with a first air outlet pipe connected to the exhaust channel. It also includes a preheating tank, which is equipped with a water-heat pre-exchange device. The steam discharged from the first outlet pipe flows into the water-heat exchange device in the preheating tank for further heat exchange.

[0007] Furthermore, a baffle is provided at the upper position inside the flash tank, the exhaust channel of the rotating shaft is connected to the baffle, an air outlet is provided above the baffle of the flash tank, and the first air outlet pipe is connected to the air outlet.

[0008] Furthermore, the bottom of the flash tank is equipped with a rotary joint, the interior of which is connected to the bottom of the rotating shaft.

[0009] Furthermore, a first pressure reducing valve is provided on the first air intake pipe, and a second pressure reducing valve is installed on the first air outlet pipe.

[0010] Furthermore, the water-heat pre-exchange device inside the preheating tank includes a spiral tube located in the middle of the preheating tank and multiple air boxes located around the spiral tube.

[0011] Furthermore, multiple gas boxes are rectangular in shape and are evenly arranged around the spiral tube.

[0012] Furthermore, the upper and lower ends of the gas box are respectively provided with an upper gas ring and a lower gas ring, the upper gas ring penetrating the top of all gas boxes, and the lower gas ring penetrating the bottom of all gas boxes.

[0013] Furthermore, the first air outlet pipe is connected to the bottom inlet of the spiral tube, the top outlet of the spiral tube is connected to the upper air ring, and the lower air ring is connected to the second air outlet pipe.

[0014] Compared with the prior art, the present invention, by adopting the above technical solution, has the following advantages: A rotating shaft is installed inside the flash tank, with multiple U-shaped tubes on both sides of the shaft. The two ends of each U-shaped tube are connected to two adjacent airflow channels above and below the shaft. The U-shaped tubes on both sides of the shaft are connected in series along the flow direction of the high-temperature steam, improving heat exchange efficiency. The high-temperature steam further undergoes heat exchange in the preheating tank through a hydrothermal pre-exchange device. Through these two heat exchange processes, energy is fully recovered, reducing heat loss.

[0015] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 yes Figure 1 Sectional view at point AA along the middle; Figure 3 It is a 3D view of the shaft and the U-shaped tube; Figure 4 This is a sectional view of the rotating shaft.

[0017] In the diagram, 1-flash tank, 2-preheating tank, 3-rotating shaft, 301-air inlet channel, 302-exhaust channel, 4-airflow channel, 5-U-shaped pipe, 6-partition plate, 7-first air inlet pipe, 8-rotary joint, 9-first pressure reducing valve, 10-air outlet, 11-water inlet, 12-drain outlet, 13-second pressure reducing valve, 14-water pipe, 15-first air outlet pipe, 16-air box, 17-upper air ring, 18-spiral pipe, 19-lower air ring, 20-second air outlet pipe. Detailed Implementation

[0018] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described with reference to the accompanying drawings.

[0019] like Figure 1-3 As shown, this utility model provides a hydrothermal flash evaporation device with waste heat recovery, including a flash tank 1. A rotating shaft 3 is rotatably installed inside the flash tank 1. Multiple airflow channels 4 are arranged vertically to the shaft 3 from top to bottom. Multiple U-shaped tubes 5 are arranged on both sides of the rotating shaft 3. The two ends of the U-shaped tubes 5 are respectively connected to two adjacent airflow channels 4 on the upper and lower sides of the rotating shaft 3, so that the U-shaped tubes 5 on the left and right sides of the rotating shaft 3 are connected in series along the flow direction of high-temperature steam. The rotating shaft 3 is driven by a drive motor. The lower end and upper end of the rotating shaft 3 are respectively provided with an intake passage 301 and an exhaust passage 302, such as... Figure 4 The air inlet channel 301 and the exhaust channel 302 are used for the intake and exhaust of high-pressure steam, respectively. The flash tank 1 is also provided with a water inlet 11 and a drain outlet 12. The bottom of the flash tank 1 is provided with a first air inlet pipe 7 connected to the air inlet channel 301, and the top of the flash tank 1 is provided with a first air outlet pipe 15 connected to the exhaust channel 302.

[0020] This utility model also includes a preheating tank 2, which is equipped with a water-heat pre-exchange device. The steam discharged from the first steam outlet pipe 15 flows into the water-heat exchange device in the preheating tank 2 for further heat exchange.

[0021] A baffle 6 is located at the upper part of the flash tank 1. The exhaust channel 302 of the rotating shaft 3 is connected to the baffle 6 and above. An exhaust port 10 is located above the baffle 6 of the flash tank 1, and the first exhaust pipe 15 is connected to the exhaust port 10. The upper end of the rotating shaft 3 is rotatably mounted on the baffle 6, and the lower end of the rotating shaft 3 is rotatably mounted on the bottom of the flash tank 1.

[0022] The bottom of the flash tank 1 is provided with a rotary joint 8, and the interior of the rotary joint 8 is connected to the bottom of the rotating shaft 3.

[0023] The first air inlet pipe 7 is equipped with a first pressure reducing valve 9, and the first air outlet pipe 15 is equipped with a second pressure reducing valve 13. After passing through the first pressure reducing valve 9, the high-temperature and high-pressure steam is rapidly depressurized and enters the rotating shaft 3 of the flash tank 1 for heat exchange. Then, through the second pressure reducing valve 13, the pressure is further reduced, allowing the high-temperature steam to further exchange heat in the preheating tank 2.

[0024] The hydrothermal pre-exchange device inside the preheating tank 2 includes a spiral tube 18 located in the middle of the preheating tank 2 and multiple gas boxes 16 located around the spiral tube 18. High-temperature steam flows sequentially through the spiral tube 18 and the gas boxes 16 for heat exchange.

[0025] Multiple air boxes 16 are rectangular in shape and are evenly arranged around the spiral tube 18.

[0026] The upper end and lower end of the air box 16 are respectively provided with an upper air ring 17 and a lower air ring 19. The upper air ring 17 passes through the top of all air boxes 16, and the lower air ring 19 passes through the bottom of all air boxes 16. The first air outlet pipe 15 is connected to the bottom inlet of the spiral pipe 18, the top outlet of the spiral pipe 18 is connected to the upper air ring 17, and the lower air ring 19 is connected to the second air outlet pipe 20.

[0027] The specific working principle of this utility model: After passing through the first pressure reducing valve 9 on the first air inlet pipe 7, the high-temperature and high-pressure steam is rapidly depressurized and enters the rotating shaft 3 of the flash tank 1 for heat exchange. During the heat exchange process, the U-shaped tube rotates under the drive of the drive motor, which greatly enhances the heat exchange effect. After heat exchange, the high-temperature steam enters the first air outlet pipe 15 from the air outlet 10 at the upper end of the partition 6, and is further depressurized by the second pressure reducing valve 13, so that the high-temperature steam can further exchange heat in the preheating tank 2 through the water heat pre-exchange device. Through two heat exchanges, the energy is fully recovered and the heat loss is reduced.

[0028] The direction of water flow: The water first enters the preheating tank 2 from the bottom. In the water heat exchange device of the preheating tank 2, the water is preheated by the residual heat of the high temperature steam. Then, it enters the water inlet 11 at the lower end of the flash tank 1 from the water pipe 14 at the top of the preheating tank 2. After heat exchange in the flash tank 1, the high temperature water is discharged from the drain outlet 12 for further use.

[0029] The above description provides examples of the preferred embodiments of this utility model. Any aspects not detailed herein are common knowledge to those skilled in the art. The scope of protection of this utility model is determined by the claims. Any equivalent modifications based on the technical teachings of this utility model are also within the scope of protection of this utility model.

Claims

1. A hydrothermal flash evaporation device with waste heat recovery capability, characterized in that: The device includes a flash tank (1), in which a rotating shaft (3) is rotatably installed. The rotating shaft (3) has multiple airflow channels (4) arranged perpendicular to its axis from top to bottom. Multiple U-shaped tubes (5) are provided on both sides of the rotating shaft (3). The two ends of the U-shaped tubes (5) are connected to two adjacent airflow channels (4) on the upper and lower sides of the rotating shaft (3), so that the U-shaped tubes (5) on the left and right sides of the rotating shaft (3) are connected in series along the flow direction of high-temperature steam. The lower end and upper end of the rotating shaft (3) are respectively provided with an air inlet channel (301) and an exhaust channel (302). The body of the flash tank (1) is also provided with a water inlet (11) and a drain outlet (12). The bottom of the flash tank (1) is provided with a first air inlet pipe (7) connected to the air inlet channel (301), and the top of the flash tank (1) is provided with a first air outlet pipe (15) connected to the exhaust channel (302). It also includes a preheating tank (2), which is equipped with a water heat exchange device. The steam discharged from the first steam outlet pipe (15) flows into the water heat exchange device in the preheating tank (2) for further heat exchange.

2. The hydrothermal flash evaporator with waste heat recovery as described in claim 1, characterized in that: A partition (6) is provided at the upper position inside the flash tank (1). The exhaust channel (302) of the rotating shaft (3) is connected to the partition (6) and above. An air outlet (10) is provided above the partition (6) of the flash tank (1). The first air outlet pipe (15) is connected to the air outlet (10).

3. The hydrothermal flash evaporator with waste heat recovery as described in claim 1, characterized in that: The bottom of the flash tank (1) is provided with a rotary joint (8), and the interior of the rotary joint (8) is connected to the bottom of the rotating shaft (3).

4. The hydrothermal flash evaporator with waste heat recovery as described in claim 1, characterized in that: The first intake pipe (7) is equipped with a first pressure reducing valve (9), and the first exhaust pipe (15) is equipped with a second pressure reducing valve (13).

5. The hydrothermal flash evaporator with waste heat recovery as described in claim 1, characterized in that: The hydrothermal pre-exchange device in the preheating tank (2) includes a spiral tube (18) located in the middle of the preheating tank (2) and multiple air boxes (16) located around the spiral tube (18).

6. The hydrothermal flash evaporator with waste heat recovery as described in claim 5, characterized in that: Multiple air boxes (16) are rectangular in shape and are evenly arranged around the spiral tube (18).

7. A hydrothermal flash evaporator with waste heat recovery as described in claim 6, characterized in that: The upper end and lower end of the air box (16) are respectively provided with an upper air ring (17) and a lower air ring (19). The upper air ring (17) passes through the top of all air boxes (16), and the lower air ring (19) passes through the bottom of all air boxes (16).

8. The hydrothermal flash evaporator with waste heat recovery as described in claim 7, characterized in that: The first air outlet pipe (15) is connected to the bottom inlet of the spiral pipe (18), the top outlet of the spiral pipe (18) is connected to the upper air ring (17), and the lower air ring (19) is connected to the second air outlet pipe (20).

Images