A high-efficiency circulating evaporation device and control method for resource-based treatment of sedimentation mud water

Abstract

The present invention discloses a high-efficiency circulating evaporation device for resource-recycling sediment sludge. The device comprises a heat exchanger, a sludge inlet pipe and a dry tower outlet pipe connected to the heat exchanger input end, and a water distribution pipe and a clean water pipe connected to the heat exchanger output end. The water distribution pipe is connected to a wet tower, and a branch pipe of the clean water pipe is connected to the dry tower. Evaporation attachment rods for sludge attachment are evenly arranged in the wet tower, and condensation attachment rods for condensed water to pass through are evenly arranged in the dry tower. A water vapor transmission pipeline is provided between the wet and dry towers, and a mud discharge hole is provided at the bottom of the wet tower. This device significantly reduces the moisture content of the bottom sludge, shortens the sediment sludge treatment process, and reduces treatment costs.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, in particular to a high-efficiency circulating evaporation device for resource-based treatment of sedimentation muddy water and a control method thereof. Background Art

[0002] Sedimentation is one of the most commonly used methods in water treatment, offering advantages such as simplicity, low cost, and excellent results. However, sedimentation processes, whether for water or wastewater treatment, generate significant amounts of muddy water (also known as bottom sludge). Over time, pollutants in the water settle to the bottom of the sedimentation tank, creating muddy water. This muddy water has an extremely high moisture content, typically around 99.5%. Typically, this muddy water is pumped through sludge pipes at the bottom of the tank to a sludge thickening tank for concentration. After treatment, the water in the muddy water is returned to the front end of the wastewater or water treatment process for reuse. After concentration, the moisture content of the muddy water has been reduced to around 90%, and this is referred to as bottom sludge. This sludge still does not meet landfill or incineration standards and requires compression to reduce its moisture content to 60% before further treatment.

[0003] This treatment method involves both concentration and compression, resulting in a lengthy process and a large footprint. Furthermore, the treated water still requires further processing before it can be used. Furthermore, after prolonged operation, both the concentration tanks and compressors in both sewage and water plants are prone to malfunction, resulting in the final sludge moisture content failing to meet subsequent treatment requirements, thus impacting treatment capacity. Summary of the Invention

[0004] The technical problems to be solved by the present invention are low efficiency, high cost and poor utilization rate of muddy water treatment.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a high-efficiency circulating evaporation device for resource-based treatment of sedimented mud and water, including a heat exchanger, a mud and water inlet pipe and a dry tower outlet pipe connected to the input end of the heat exchanger, and a water distribution pipe and a clean water pipe connected to the output end of the heat exchanger. The water distribution pipe is connected to the wet tower, and the branch pipe of the clean water pipe is connected to the dry tower. Evaporation attachment rods for mud and water to attach are evenly arranged in the wet tower, and condensation attachment rods for condensed water to pass through are evenly arranged in the dry tower. A water vapor transmission pipeline is arranged between the wet tower and the dry tower, and a mud discharge hole is arranged at the bottom of the wet tower.

[0006] Preferably, the top of the wet tower is provided with air holes, the output end of the water distribution pipe is connected to the top of the wet tower, the inner top of the wet tower is provided with a water storage area, the bottom of the water storage area is evenly provided with through holes, the evaporation attachment rods are evenly arranged below the water storage area, and the water vapor transport pipeline is located on one side of the evaporation attachment rods.

[0007] Preferably, a sieve plate is provided in the wet tower, with sieve holes for the evaporation attachment rod to pass through, the sieve plate is vertically slidably connected to the evaporation attachment rod, and electric push rods are provided on opposite side walls of the wet tower, and the output ends of the electric push rods are connected to the sieve plate.

[0008] Preferably, the surface of the evaporation attachment rod is provided with continuous concave lines, rubber bristles are evenly arranged around the center of the inner side of the sieve hole, and an electric heating wire is provided inside the evaporation attachment rod.

[0009] Preferably, three water vapor transport pipelines are arranged between the wet tower and the dry tower, the top of the wet tower side wall is connected to the bottom of the dry tower side wall through the water vapor transport pipeline, the middle of the wet tower side wall is connected to the middle of the dry tower side wall through the water vapor transport pipeline, and the bottom of the wet tower side wall is connected to the top of the dry tower side wall through the water vapor transport pipeline, and the water vapor transport pipelines are all connected to exhaust fans.

[0010] Preferably, the condensation attachment tubes are evenly distributed in the dry tower, and a water storage area is provided at the top of the dry tower, and the water storage area is connected to the top of the condensation attachment rod.

[0011] Preferably, the outer walls of the wet tower and the dry tower are both wrapped with a layer of heat insulation material.

[0012] The temperature of the top end of the evaporation attachment rod is between 93-97°C, and the temperature of the bottom end of the evaporation attachment rod is between 55-65°C.

[0013] A control method for a high-efficiency circulating evaporation device for resource-based treatment of sedimentation mud water comprises the following steps:

[0014] Step 1: Preheating: transport the muddy water to the heat exchanger through the muddy water inlet pipe, and transport the hot water output from the dry tower outlet pipe to the heat exchanger to preheat the muddy water with the hot water;

[0015] Step 2: Evaporation: The preheated muddy water is transported to the wet tower through the water distribution pipe, and the heating wire in the evaporation attachment rod is activated. The evaporation attachment rod heats the muddy water attached to the surface and generates a large amount of water vapor;

[0016] Step 3: Condensation. Start the exhaust fan to extract the water vapor generated by the evaporation of mud and water, so that the water vapor is transferred from the wet tower to the dry tower. When the water vapor enters the dry tower, the water that has been heated and cooled in the heat exchanger is transported to the condensation attachment rod. After the water vapor condenses on the surface of the condensation attachment rod, it flows down in streams. The heated water in the condensation attachment rod is then transported to the heat exchanger for recycling.

[0017] Preferably, when controlling the power of the exhaust fan, the power is adjusted according to the concentration of water vapor generated by evaporation of muddy water. When the water vapor concentration is high, the exhaust fan F is controlled to increase the power. The specific control method is:

[0018] The molar flux of liquid water evaporated from the evaporation device is N=K(Cliquid-Cgas);

[0019] Where K is the mass transfer coefficient of gas-liquid two phases;

[0020] Cliquid is the water vapor concentration on the liquid surface, and Cgas is the water vapor concentration in the gas phase. The water vapor concentration is detected by a water vapor analyzer.

[0021] The water vapor concentration on the liquid surface can be directly quoted from the water vapor concentration when the water vapor partial pressure at the interface is equal to the saturated vapor pressure;

[0022] C solution = p(T) / RT;

[0023] Where p(T) is the saturated vapor pressure of the liquid at temperature T;

[0024] R is the universal gas constant;

[0025] Fan control wind speed V=Q / (ρAir A);

[0026] Where Q is the gas phase flow rate of the fan;

[0027] ρgas is the density of the gas phase at the inlet temperature;

[0028] A gas cross section.

[0029] 1. The present invention provides a high-efficiency circulating evaporation device for resource-based treatment of sedimentation mud water, which effectively solves the problems of long sedimentation mud water treatment process and large area occupation, and can be used in areas with limited land.

[0030] 2. The process flow of mud and water treatment in this patent is short, and the overall heat utilization rate is high, the energy consumption is controllable, and the entire treatment process does not require the addition of external chemicals. Compared with traditional methods, the operating cost is lower.

[0031] 3. The muddy water treated by this patent can be directly reused or used after filtration, which effectively improves the utilization rate of water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be further described below with reference to the accompanying drawings and examples:

[0033] Figure 1 Schematic diagram of the structure of an embodiment of the present invention.

[0034] Figure 2 Schematic diagram of the structure of the sieve plate in an embodiment of the present invention.

[0035] Figure 3 Schematic diagram of the internal structure of the sieve hole in an embodiment of the present invention.

[0036] In the figure: 1. Evaporation attachment rod; 2. Water storage area; 3. Sieve plate; 4. Mud and water inlet pipe; 5. Air hole; 6. Mud discharge hole; 7. Clean water pipe; 8. Dry tower outlet pipe; 9. Water distribution pipe; 10. Condensation pipe; 11. Condensation attachment rod; A. Wet tower; B. Dry tower; F. Exhaust fan; H. Heat exchanger. DETAILED DESCRIPTION

[0037] like Figure 1-3 As shown, the present invention provides a high-efficiency circulating evaporation device for resource-based treatment of sedimented mud and water, comprising a heat exchanger H, a mud and water inlet pipe 4 and a dry tower outlet pipe 8 connected to the input end of the heat exchanger H, and a water distribution pipe 9 and a clean water pipe 7 connected to the output end of the heat exchanger H. The water distribution pipe 9 is connected to the wet tower A, and the branch pipe of the clean water pipe 7 is connected to the dry tower B. Evaporation attachment rods 1 for mud and water to attach are evenly arranged in the wet tower A, and condensation attachment rods 11 for condensed water to pass through are evenly arranged in the dry tower B. A water vapor transmission pipeline is arranged between the wet tower A and the dry tower B, and a mud discharge hole 6 is arranged at the bottom of the wet tower A.

[0038] The muddy water enters the heat exchanger H through the muddy water inlet pipe 4 and exchanges heat with the hot water output by the dry tower water outlet pipe 8. The muddy water after heat exchange enters the wet tower A through the water distribution pipe 9 and remains in the water storage area 2 of the wet tower A. There are several evaporation attachment rods 1 at the bottom of the water storage area 2. The evaporation attachment rods 1 are arranged through the sieve plate 3. The wet tower A and the dry tower B are connected through the water vapor transmission pipeline and the exhaust fan F. The top of the dry tower B is also provided with a water storage area 2. The water storage area 2 in the dry tower B is connected to the condensation attachment rod 11. The wet air from the wet tower A is sent into the dry tower B through the exhaust fan F for condensation, and thus becomes liquid and remains at the bottom of the dry tower B. The clean water enters the heat exchanger H through the dry tower water outlet pipe 8 for heat exchange. Most of it is discharged through the clean water pipe 7, and a small part re-enters the dry tower B through the condensation pipe 10 to help the wet air condense.

[0039] like Figure 1 As shown, the top of the wet tower A is provided with an air hole 5, the output end of the water distribution pipe 9 is connected to the top of the wet tower A, the inner top of the wet tower A is provided with a water storage area 2, the bottom of the water storage area 2 is evenly provided with through holes, the evaporation attachment rods 1 are evenly arranged below the water storage area 2, and the water vapor transmission pipeline is located on one side of the evaporation attachment rods 1.

[0040] The muddy water that has undergone heat exchange enters the wet tower A through the water distribution pipe 9. In the water storage area 2, the muddy water flows down from the through hole at the bottom of the water storage area 2 and adheres to the evaporation attachment rod 1, flowing along the evaporation attachment rod 1. During the flow, it is heated by the evaporation attachment rod 1 to generate a large amount of water vapor. The water vapor is transported to the dry tower B through the water vapor transport pipeline, and heat is exchanged through the condensation attachment rod 11 in the dry tower B. The generated condensed water adheres to the condensation attachment rod 11 and flows down, is discharged outside through the dry tower outlet pipe 8, and flows into the heat exchanger H, and the high-temperature condensed water undergoes preliminary heat exchange with the muddy water in the heat exchanger H.

[0041] There are air holes 5 at the top of both wet tower A and dry tower B, so that the air pressure inside and outside the tower remains consistent when the exhaust fan F is running.

[0042] As a preferred embodiment of the present invention, the surface of the evaporation attachment rod 1 is provided with a continuous pattern of depressions. Rubber bristles are evenly arranged around the center of the mesh inside the rod, and a heating wire is installed within the rod. The bristles distribute the muddy water evenly across the surface of the rod 1. The continuous pattern of depressions slows the flow of muddy water, allowing it to fully contact the flowing air and accelerate evaporation.

[0043] like Figure 1 As shown. A sieve plate 3 is installed within wet tower A, with sieve holes formed on the sieve plate 3 for the evaporation attachment rod 1 to pass through. The sieve plate 3 is vertically slidably connected to the evaporation attachment rod 1. Electric push rods are installed on opposite side walls of wet tower A, and the output ends of the electric push rods are connected to the sieve plate 3. Slots are cut within wet tower A, and electric push rods are installed. These push rods drive the sieve plate 3 to move, causing the muddy water to flow downward along the evaporation attachment rod 1, which heats the muddy water. At this point, the muddy water meets the basic conditions for evaporation. Air is continuously extracted from wet tower A by exhaust fan F, further accelerating the evaporation rate of the liquid. The specific surface area of ​​the muddy water increases, the temperature rises, and the surface air velocity increases, causing evaporation to occur rapidly. The water in the muddy water becomes gaseous and enters dry tower B. At this point, the heat in the muddy water also enters the gaseous water. Therefore, this process occurs continuously from the top of wet tower A to the bottom, with two differences existing within the wet tower.

[0044] The first is the gaseous state difference. The top of wet tower A has the least gaseous water and the most muddy water, while the bottom has the most gaseous water and the least muddy water.

[0045] The second is the temperature difference. The mud water temperature at the top of wet tower A is the highest and the gaseous water temperature is the lowest. The mud water temperature at the bottom is the lowest and the gaseous water temperature is the highest.

[0046] Therefore, the gaseous water at the bottom of the wet tower A is pumped to the top of the dry tower B through the multi-stage exhaust fan F, and conversely, the gaseous water or gas at the top is pumped to the bottom of the dry tower B.

[0047] This creates a temperature difference inside dry tower B. The temperature at the top of dry tower B is the highest, and the temperature at the bottom is the lowest. The condensed water flows from top to bottom, ensuring the efficiency of condensation.

[0048] like Figure 1 As shown. Three water vapor delivery pipelines are provided between the wet tower A and the dry tower B. The top of the side wall of the wet tower A is connected to the bottom of the side wall of the dry tower B via the water vapor delivery pipeline. The middle of the side wall of the wet tower A is connected to the middle of the side wall of the dry tower B via the water vapor delivery pipeline. The bottom of the side wall of the wet tower A is connected to the top of the side wall of the dry tower B via the water vapor delivery pipeline. Each of the water vapor delivery pipelines is connected to an exhaust fan F.

[0049] like Figure 1 The condensation attachment pipes 11 are evenly distributed within the dry tower B. A water storage area 2 is provided at the top of the dry tower B, which is connected to the top of the condensation attachment rods 11. Condensed water after heat exchange is transported to the water storage area 2 of the dry tower B through the condensation pipes 10 and flows down the condensation attachment rods 11.

[0050] Both wet tower A and dry tower B are closed, heat-absorbing and heat-insulating metal tanks, which are conducive to absorbing external heat and preserving internal heat. A layer of insulation material is wrapped around the outer body of the tower.

[0051] The temperature of the top end of the evaporation attachment rod 1 is between 93-97°C, and the temperature of the bottom end of the evaporation attachment rod 1 is between 55-65°C.

[0052] A control method for a high-efficiency circulating evaporation device for resource-based treatment of sedimentation mud water comprises the following steps:

[0053] Step 1: Preheating: The muddy water is transported to the heat exchanger H through the muddy water inlet pipe 4, and the hot water output from the dry tower outlet pipe 8 is transported to the heat exchanger H to preheat the muddy water with the hot water;

[0054] Step 2: Evaporation: The preheated muddy water is transported to the wet tower A through the water distribution pipe 9, and the heating wire in the evaporation attachment rod 1 is activated. The evaporation attachment rod 1 heats the muddy water attached to the surface and generates a large amount of water vapor;

[0055] Step 3: Condensation. Start the exhaust fan F to extract the water vapor generated by the evaporation of mud and water, so that the water vapor is transferred from the wet tower A to the dry tower B. When the water vapor enters the dry tower, the water that has been heated and cooled in the heat exchanger H is transported to the condensation attachment rod 11. After the water vapor condenses on the surface of the condensation attachment rod 11, it flows down in streams. The heated water in the condensation attachment rod 11 is then transported to the heat exchanger H for recycling.

[0056] When controlling the power of the exhaust fan F, it is adjusted according to the concentration of water vapor generated by evaporation of muddy water. When the water vapor concentration is high, the exhaust fan F is controlled to increase its power. The specific control method is:

[0057] The molar flux of liquid water evaporated from the evaporation device is N=K(Cliquid-Cgas);

[0058] Where K is the mass transfer coefficient of gas-liquid two phases;

[0059] Cliquid is the water vapor concentration on the liquid surface, and Cgas is the water vapor concentration in the gas phase. The water vapor concentration is detected by a water vapor analyzer.

[0060] The water vapor concentration on the liquid surface can be directly quoted from the water vapor concentration when the water vapor partial pressure at the interface is equal to the saturated vapor pressure;

[0061] C solution = p(T) / RT;

[0062] Where p(T) is the saturated vapor pressure of the liquid at temperature T;

[0063] R is the universal gas constant;

[0064] Fan control wind speed V=Q / (ρAir A);

[0065] Where Q is the gas phase flow rate of the fan;

[0066] ρgas is the density of the gas phase at the inlet temperature;

[0067] A gas cross section.

[0068] Determine the density (ρ) and viscosity (μ) of the fluid. Measure or determine key geometric parameters, the diameter of the rod (D) and the flow height or length considered (L).

[0069] Average flow rate of muddy water on the evaporation rod U= h / ρD

[0070] The muddy water flow rate (Q) of each evaporation rod can be calculated by the following formula: Q = πDLUρ.

[0071] The specific values ​​of evaporation rods D and L and the number of settings can be calculated based on the required processing volume.

Claims

1. A high-efficiency circulating evaporation device for resource-based treatment of sedimentation muddy water, characterized by: It comprises a heat exchanger (H), a muddy water inlet pipe (4) and a dry tower water outlet pipe (8) connected to the input end of the heat exchanger (H), and a water distribution pipe (9) and a clean water pipe (7) connected to the output end of the heat exchanger (H), the water distribution pipe (9) is connected to the wet tower (A), and a branch pipe of the clean water pipe (7) is connected to the dry tower (B), evaporation attachment rods (1) for muddy water to attach are evenly arranged in the wet tower (A), condensation attachment rods (11) for condensed water to pass through are evenly arranged in the dry tower (B), a water vapor transmission pipeline is arranged between the wet tower (A) and the dry tower (B), and a mud discharge hole (6) is arranged at the bottom of the wet tower (A); The top of the wet tower (A) is provided with an air hole (5), the output end of the water distribution pipe (9) is connected to the top of the wet tower (A), the inner top of the wet tower (A) is provided with a water storage area (2), the bottom of the water storage area (2) is evenly provided with through holes, the evaporation attachment rods (1) are evenly arranged below the water storage area (2), and the water vapor transmission pipeline is located on one side of the evaporation attachment rod (1); A sieve plate (3) is provided in the wet tower (A), and a sieve hole is provided on the sieve plate (3) for the evaporation attachment rod (1) to pass through. The sieve plate (3) is vertically slidably connected to the evaporation attachment rod (1). Electric push rods are provided on opposite side walls of the wet tower (A), and the output ends of the electric push rods are connected to the sieve plate (3); The surface of the evaporation attachment rod (1) is provided with continuous concave lines, the inner side of the sieve hole is evenly provided with rubber bristles around the center of the circle, and the evaporation attachment rod (1) is provided with an electric heating wire.

2. The high-efficiency circulating evaporation device for resource-based treatment of sedimentation mud water according to claim 1, characterized in that: Three water vapor transport pipelines are arranged between the wet tower (A) and the dry tower (B). The top of the side wall of the wet tower (A) is connected to the bottom of the side wall of the dry tower (B) through the water vapor transport pipeline, the middle of the side wall of the wet tower (A) is connected to the middle of the side wall of the dry tower (B) through the water vapor transport pipeline, and the bottom of the side wall of the wet tower (A) is connected to the top of the side wall of the dry tower (B) through the water vapor transport pipeline. The water vapor transport pipelines are all connected to exhaust fans (F).

3. The high-efficiency circulating evaporation device for resource-based treatment of sedimentation mud water according to claim 1, characterized in that: The condensation attachment rods (11) are evenly distributed in the dry tower (B), and a water storage area (2) is provided at the top of the dry tower (B), and the water storage area (2) is communicated with the top of the condensation attachment rods (11).

4. The high-efficiency circulating evaporation device for resource-based treatment of sedimentation mud water according to claim 1, characterized in that: The outer walls of the wet tower (A) and the dry tower (B) are both wrapped with a layer of heat insulation material.

5. The high-efficiency circulating evaporation device for resource-based treatment of sedimentation mud water as claimed in claim 1, characterized in that: The temperature of the top end of the evaporation attachment rod (1) is between 93-97°C, and the temperature of the bottom end of the evaporation attachment rod (1) is between 55-65°C.

6. The control method of a high-efficiency circulating evaporation device for resource treatment of sediment mud water as claimed in claim 1, characterized in that: The steps include: Step 1: preheating, the muddy water is transported to the heat exchanger (H) through the muddy water inlet pipe (4), and the hot water output from the dry tower outlet pipe (8) is transported to the heat exchanger (H), and the muddy water is preheated by the hot water; Step 2: Evaporation: The preheated muddy water is transported to the wet tower (A) through the water distribution pipe (9), and the electric heating wire in the evaporation attachment rod (1) is activated. The evaporation attachment rod (1) heats the muddy water attached to the surface and generates a large amount of water vapor; Step 3: Condensation. Start the exhaust fan (F) to extract the water vapor generated by the evaporation of mud and water, so that the water vapor is transferred from the wet tower (A) to the dry tower (B). When the water vapor enters the dry tower, the water that has been heated and cooled in the heat exchanger (H) is transported to the condensation attachment rod (11). The water vapor condenses on the surface of the condensation attachment rod (11) and flows down in streams. The heated water in the condensation attachment rod (11) is then transported to the heat exchanger (H) for recycling.

7. The control method of a high-efficiency circulating evaporation device for resource treatment of sedimentation mud water as claimed in claim 6, characterized in that: When controlling the power of the exhaust fan (F), the power is adjusted according to the concentration of water vapor generated by evaporation of muddy water. When the water vapor concentration is high, the exhaust fan (F) is controlled to increase its power. The specific control method is: The molar flux of liquid water evaporated from the evaporation device is N=K(Cliquid-Cgas); Where K is the mass transfer coefficient of gas-liquid two phases; Cliquid is the water vapor concentration on the liquid surface, and Cgas is the water vapor concentration in the gas phase. The water vapor concentration is detected by a water vapor analyzer. The water vapor concentration on the liquid surface can be directly quoted from the water vapor concentration when the water vapor partial pressure at the interface is equal to the saturated vapor pressure; C solution = p(T) / RT; Where p(T) is the saturated vapor pressure of the liquid at temperature T, and R is the universal gas constant; Fan control wind speed V=Q / (ρ 气 A); Where Q is the gas flow rate of the fan, ρgas is the density of the gas at the inlet temperature, and A is the gas cross section.

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