Efficient circulating evaporation device for resourceful treatment of precipitated muddy water and control method

Abstract

The invention discloses an efficient circulating evaporation device for resourceful treatment of precipitated muddy water, which comprises a heat exchanger, a muddy water inlet pipe and a dry tower water outlet pipe which are connected to the input end of the heat exchanger, and a water distribution pipe and a clear water pipe which are connected to the output end of the heat exchanger, evaporation attachment rods allowing muddy water to be attached are evenly arranged in the wet tower, condensation attachment rods allowing condensed water to pass through are evenly arranged in the dry tower, a water vapor conveying pipeline is arranged between the wet tower and the dry tower, and a mud discharging hole is formed in the bottom of the wet tower. The effects of greatly reducing the water content of the bottom mud at one time, shortening the treatment process of the sediment muddy water and reducing the treatment cost are achieved.

Description

Technical Field

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

[0002] In water treatment, sedimentation is one of the most commonly used treatment methods, with the advantages of simple process, low cost and good effect. However, whether it is the sedimentation process of water supply treatment or sewage treatment, a lot of muddy water (or called bottom mud) will be produced. When the pollutants in the water body settle to the bottom of the pool over time, muddy water will be produced at the bottom of the sedimentation tank. The water content of this part of muddy water is extremely high, generally around 99.5%. Generally speaking, this muddy water will be pumped to the sludge concentration tank by the sludge pipe at the bottom of the pool for concentration treatment. After the treatment, the water in the muddy water enters the front end of the entire sewage or water supply treatment and is reused. The water content of the concentrated muddy water has been reduced to about 90%, which we call bottom mud. This part of the bottom mud still does not meet the standards for landfill or incineration, and still needs to be compressed to further reduce the water content to 60% before treatment.

[0003] This treatment method involves two methods, concentration and compression. The treatment process is long, the treatment structure occupies a large area, and the treated water still needs to be treated before it can be used. At the same time, whether it is a sewage plant or a water plant, after a long period of operation, the concentration tank and the compressor are prone to failure, resulting in the final sludge moisture content not meeting the standard for subsequent treatment, thus affecting the treatment volume. Summary of the invention

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

[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 water, including a heat exchanger, a mud 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, the branch pipe of the clean water pipe is connected to the dry tower, evaporation attachment rods for mud water to attach are evenly arranged in the wet tower, 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 rod.

[0007] Preferably, a sieve plate is provided in the wet tower, the sieve plate is provided 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 patterns, rubber bristles are evenly arranged around the center of the inner side of the sieve hole, and an electric heating wire is arranged 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 pipes 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 processing of sedimentation mud water comprises the following steps: Step 1: preheating: transport the muddy water to the heat exchanger through the muddy water inlet pipe, transport the hot water output from the dry tower outlet pipe to the heat exchanger, and preheat the muddy water with the hot water; Step 2: Evaporation: The preheated muddy water is transported to the wet tower through the water distribution pipe, and the electric heating wire in the evaporation attachment rod is started. The evaporation attachment rod heats the muddy water attached to the surface and generates a large amount of water vapor; Step three, condensation, start the exhaust fan to extract the water vapor generated by the evaporation of mud 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.

[0014] Preferably, when controlling the power of the exhaust fan, the power is adjusted according to the concentration of water vapor generated by the 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: 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 phase; 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 liquid = p(T) / RT; Where p(T) is the saturated vapor pressure of the liquid at temperature T; R is the universal gas constant; Fan controls wind speed V=Q / (ρAir A); Where Q is the gas phase flow rate of the fan; ρgas is the density of the gas phase at the inlet temperature; A Gas cross section.

[0015] 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 land occupation, and can be used in areas with limited land.

[0016] 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.

[0017] 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

[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0019] Figure 2 Schematic diagram of the structure of the sieve plate in an embodiment of the present invention.

[0020] Figure 3 Schematic diagram of the internal structure of the sieve hole in an embodiment of the present invention.

[0021] 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. Condenser pipe; 11. Condenser attachment rod; A. Wet tower; B. Dry tower; F. Exhaust fan; H. Heat exchanger. DETAILED DESCRIPTION

[0022] like Figure 1-3As shown, the present invention provides a high-efficiency circulating evaporation device for resource-based treatment of sedimented mud water, comprising a heat exchanger H, a mud 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 the branch pipe of the clean water pipe 7 is connected to the dry tower B. Evaporation attachment rods 1 for mud 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.

[0023] 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 is stored 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 rods 11. The wet air from the wet tower A is sent into the dry tower B through the exhaust fan F for condensation, so that it 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.

[0024] like Figure 1 The wet tower A is provided with air holes 5 at the top, 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 delivery pipeline is located on one side of the evaporation attachment rod 1.

[0025] The muddy water after 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, flows along the evaporation attachment rod 1, and is heated by the evaporation attachment rod 1 during the flow, generating 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 through the dry tower outlet pipe 8, and flows into the heat exchanger H, and preliminary heat exchange is performed between the high-temperature condensed water and the muddy water in the heat exchanger H.

[0026] 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 towers remains consistent when the exhaust fan F is running.

[0027] As a preferred embodiment of the present invention, the surface of the evaporation attachment rod 1 is provided with continuous concave patterns, 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. The intervention of the bristles makes the muddy water evenly distributed on the surface of the evaporation attachment rod 1. The setting of the continuous concave patterns can slow down the speed of the muddy water flowing down, so that it can fully contact with the flowing air and accelerate evaporation.

[0028] like Figure 1 As shown. The wet tower A is provided with a sieve plate 3, and the sieve plate 3 is provided with sieve holes for the evaporation attachment rod 1 to pass through. The sieve plate 3 is vertically slidably connected to the evaporation attachment rod 1. The opposite side walls of the wet tower A are provided with electric push rods, and the output end of the electric push rod is connected to the sieve plate 3. A groove is made in the wet tower A, and an electric push rod is installed. The sieve plate 3 is driven by the electric push rod to move, and the muddy water flows downward along the evaporation attachment rod 1. The evaporation attachment rod 1 heats the muddy water. At this time, the muddy water has the basic conditions for evaporation. The air in the wet tower A is continuously drawn away by the exhaust fan F, further accelerating the evaporation rate of the liquid. At this time, the specific surface area of ​​the muddy water increases, the temperature rises, and the surface air flow rate increases, and evaporation will occur quickly. The water in the muddy water becomes gaseous and enters the dry tower B. At this time, the heat in the muddy water also enters the gaseous water. Therefore, this process occurs continuously from the top to the bottom of the wet tower A, and there are two differences in the wet tower.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] This creates a temperature difference in dry tower B, with the top of dry tower B having the highest temperature and the bottom having the lowest temperature. The condensed water flows from top to bottom, ensuring the efficiency of condensation.

[0033] like Figure 1 As shown. Three water vapor delivery 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 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 through the water vapor delivery 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 delivery pipeline. The water vapor delivery pipelines are all connected with exhaust fans F.

[0034] like Figure 1The condensation attachment pipes 11 are evenly distributed in the dry tower B. A water storage area 2 is provided at the top of the dry tower B. The water storage area 2 is connected to the top of the condensation attachment rods 11. The 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 from the condensation attachment rods 11.

[0035] 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.

[0036] 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.

[0037] A control method for a high-efficiency circulating evaporation device for resource processing of sedimentation mud water comprises the following steps: 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; 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 started. The evaporation attachment rod 1 heats the muddy water attached to the surface and generates a large amount of water vapor; Step three, condensation, start the exhaust fan F to extract the water vapor generated by the evaporation of mud 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.

[0038] When controlling the power of the exhaust fan F, the power is adjusted according to the concentration of water vapor generated by the 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: 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 phase; 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 liquid = p(T) / RT; Where p(T) is the saturated vapor pressure of the liquid at temperature T; R is the universal gas constant; Fan controls wind speed V=Q / (ρAir A); Where Q is the gas phase flow rate of the fan; ρgas is the density of the gas phase at the inlet temperature; A Gas cross section.

[0039] 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).

[0040] The average flow rate of muddy water on the evaporation rod is U= h / ρD The muddy water flow (Q) of each evaporation rod can be calculated by the following formula: Q = πDLUρ.

[0041] 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 treatment of sedimentation mud water, characterized by: The invention 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 a wet tower (A), a branch pipe of the clean water pipe (7) is connected to a 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 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).

2. The high-efficiency circulating evaporation device for resource treatment of sedimentation mud water as claimed in claim 1, characterized in that: The wet tower (A) is provided with an air hole (5) at the top, 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 rod (1) is 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).

3. The high-efficiency circulating evaporation device for resource treatment of sediment mud water as claimed in claim 2 is characterized by: A sieve plate (3) is arranged 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 arranged 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).

4. The high-efficiency circulating evaporation device for resource-based treatment of sedimentation mud water as claimed in claim 3 is characterized by: The surface of the evaporation attachment rod (1) is provided with continuous concave patterns, rubber bristles are evenly arranged around the center of the inner side of the sieve hole, and an electric heating wire is arranged inside the evaporation attachment rod (1).

5. The high-efficiency circulating evaporation device for resource treatment of sedimentation mud water as claimed in 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, and the water vapor transport pipelines are all connected to exhaust fans (F).

6. The high-efficiency circulating evaporation device for resource-based treatment of sedimentation mud water as claimed in claim 1, characterized in that: The condensation attachment tubes (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 connected to the top of the condensation attachment rod (11).

7. The high-efficiency circulating evaporation device for resource treatment of sediment mud water as claimed in 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.

8. The high-efficiency circulating evaporation device for resource 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.

9. The control method of a high-efficiency circulating evaporation device for resource treatment of sedimentation 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), 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 started. The evaporation attachment rod (1) heats the muddy water attached to the surface and generates a large amount of water vapor; Step three, condensation, start the exhaust fan (F) to extract the water vapor generated by the evaporation of the mud 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.

10. The control method of a high-efficiency circulating evaporation device for resource treatment of sedimentation mud water as claimed in claim 9, 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 the evaporation of muddy water. When the concentration of water vapor is high, the exhaust fan (F) is controlled to increase the 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 phase; 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 liquid = 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 controls wind speed V=Q / (ρAir 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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