A pneumatic cleaning system for sewage treatment sludge pipelines

Abstract

The present application relates to sewage treatment technical field, specifically to a kind of sewage treatment mud conveying pipeline pneumatic cleaning system, including conveying main pipe, pneumatic cleaning pipeline and gas-mud separator.Pneumatic cleaning pipeline includes intake pipe and exhaust pipe and is attached to conveying main pipe and is arranged, intake pipe tangentially converges into the front end of conveying main pipe, exhaust pipe is connected with gas-mud separator, turbine is arranged in gas-mud separator, and gas-mud mixture ejected from exhaust pipe impacts turbine to make turbine rotate, turbine rotation drives generator to generate electricity, and the electric energy generated by generator can be used for system load.The present application system can realize pneumatic cleaning of conveying main pipe on the one hand, effectively avoid mud conveying pipeline blockage, ensure production stability and reduce equipment cost, on the other hand, effectively separate mud water in gas-mud mixture generated by pneumatic cleaning, and further make full use of kinetic energy of high-pressure gas, more energy saving and environmental protection.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and more specifically to a pneumatic cleaning system for wastewater treatment sludge conveying pipelines. Background Technology

[0002] Wastewater treatment generates a large amount of sludge. Sludge produced during wastewater treatment generally has a high water content. Even after concentration in a sludge thickening tank, the water content can still reach over 95%. Therefore, this sludge has good fluidity and is suitable for pipeline transportation. However, due to its high water content, the sludge cannot be directly discharged. Therefore, in sludge treatment, it is necessary to concentrate and dewater the sludge. Plate and frame filter presses are often used for filtration and concentration to reduce the water content of the sludge to about 60%. The dewatered sludge is also a valuable resource and is widely used in agriculture, forestry, building materials and other fields.

[0003] Plate and frame filter presses are intermittent filtration equipment, and compared to many continuous filtration devices on the market, their production efficiency is lower. However, due to their advantages such as high filtration driving force, high solids content in the filter cake, clear filtrate, high solids recovery rate, and low consumption of conditioning chemicals, they are still widely used in wastewater treatment plants. Due to the intermittent operation of plate and frame filter presses, the sludge in their sludge conveying pipelines also flows intermittently. During long-term use, sludge accumulation in the pipelines can easily occur, which increases pipeline resistance and energy consumption, hinders stable production, and increases equipment maintenance costs.

[0004] Based on the aforementioned defects in the use of sludge conveying pipelines, this invention proposes a pneumatic cleaning system for sludge conveying pipelines that can effectively clean the pipelines and effectively treat the resulting air-sludge mixture. This system is of great significance for ensuring stable production operation, reducing system energy consumption, and protecting the environment. Summary of the Invention

[0005] The purpose of this invention is to provide a pneumatic cleaning system for sludge conveying pipelines in sewage treatment, in order to solve the problem that in the existing sewage treatment process, when sludge is intermittently transported, sludge accumulation can easily lead to pipeline blockage, which affects stable production and increases equipment maintenance costs.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a pneumatic cleaning system for sewage treatment sludge conveying pipelines, comprising a conveying main pipe, the front end of which is connected to a sludge suction pipe, and the end of which is connected to a sludge discharge pipe. A pneumatic cleaning pipeline is attached to the conveying main pipe, the pneumatic cleaning pipeline comprising an air inlet pipe and an air outlet pipe. The front end of the air inlet pipe is connected to an air compressor, and the end of the air inlet pipe is connected to the front end of the conveying main pipe. The front end of the air outlet pipe is connected to the end of the conveying main pipe, and the end of the air outlet pipe is connected to an air-sludge separator through an air inlet. A pneumatic distributor is arranged in the conveying main pipe, a turbine is installed in the air-sludge separator, and sludge collection hoppers are arranged around the turbine. The air-sludge mixture sprayed from the air outlet pipe impacts the sludge collection hoppers of the turbine. The power shaft of the turbine is connected to a generator for transmission.

[0007] Furthermore, the air inlet pipe is tangentially connected to the conveying main pipe, the front end of the air outlet pipe is connected to the end of the conveying main pipe through a tee, and the other end of the tee is connected to the sludge discharge pipe. The conveying main pipe and the air outlet pipe are arranged horizontally, and the sludge discharge pipe is arranged vertically upward.

[0008] Furthermore, the pneumatic distributors are evenly distributed in the conveying main pipe. The pneumatic distributors include three parts: a reduced-diameter bell mouth, a connecting part, and an expanded-diameter bell mouth. The diameter of the connecting part is one-half to two-thirds of the diameter of the conveying main pipe.

[0009] Furthermore, a pressurizing component is arranged at the connection between the air outlet pipe and the air-sludge distributor, and the diameter of the outlet of the pressurizing component is one-quarter to one-half of the diameter of the conveying main pipe.

[0010] Furthermore, the gas-sludge separator has a collection section below the turbine, a vent pipe at the bottom of the collection section, a defoaming screen above the turbine, and an exhaust pipe above the defoaming screen.

[0011] Furthermore, a flushing pipe is provided on the side of the gas-sludge separator opposite to the air inlet. The flushing pipe is connected to the sludge hopper cleaning nozzle and the foam breaking screen cleaning nozzle, respectively. The sludge hopper cleaning nozzle is matched with the sludge hopper of the turbine, and the foam breaking screen cleaning nozzle is matched with the foam breaking screen.

[0012] Furthermore, the foam-breaking screen cleaning nozzle is arranged above the foam-breaking screen, and the foam-breaking screen cleaning nozzle is arranged at an angle of 30 to 60° with the horizontal plane, so that the cleaning water sprayed from the foam-breaking screen cleaning nozzle fully covers the foam-breaking screen.

[0013] Furthermore, the gas-sludge separator comprises two parts: a separation chamber and a power generation chamber. The turbine is located in the separation chamber, and the generator is located in the power generation chamber. The power shaft of the turbine extends into the power generation chamber and is connected to the rotor of the generator via a drive.

[0014] Furthermore, the power generation room is equipped with a support partition, the generator is fixedly mounted on the support partition, and the rotor of the generator is connected to the power shaft of the turbine via a transmission belt.

[0015] Furthermore, the electrical energy generated by the generator is rectified and stored or regulated and frequency controlled before being supplied to the system load.

[0016] The beneficial effects of this invention are:

[0017] 1. By arranging the pneumatic cleaning pipeline, the main conveying pipeline can be cleaned. There are basically no dead corners or liquid accumulation during the cleaning process, which is conducive to the efficient cleaning of the main conveying pipeline and effectively avoids the phenomenon of sludge accumulation.

[0018] 2. The pneumatic distributor can redistribute the pneumatic force during the purging process, enabling high-pressure gas to effectively clean the pipe wall of the conveying main pipe, improving cleaning efficiency. At the same time, the pneumatic distributor has no dead corners and will not cause sludge accumulation.

[0019] 3. The mud collection bucket on the turbine can block and collect mud and water in the air-mud mixture, eliminate the kinetic energy of the high-pressure air, facilitate the discharge of the high-pressure air, and convert the kinetic energy of the high-pressure air into electrical energy generated by the generator, which is more energy-saving and environmentally friendly.

[0020] 4. The turbine can be cleaned by flushing the pipes, ensuring the stability of the equipment operation. The mud collection bucket cleaning nozzles and the air inlet are arranged opposite each other, so that the turbine can reuse the kinetic energy of the water sprayed from the cleaning nozzles, making the whole system more energy-efficient.

[0021] 5. The defoaming screen breaks up the water droplets in the gas, thereby further ensuring the gas-sludge separation effect. The defoaming screen cleaning nozzle is used to clean the defoaming screen and ensure its stable use.

[0022] 6. The electricity generated by the generator can be rectified and stored or stabilized and regulated before being used to power the air compressor and the water pump for flushing the pipeline. The electricity generated by the generator, combined with the external municipal power supply or the factory's solar power generation system, makes the entire system more energy-efficient and environmentally friendly. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the cleaning pipe layout of the cleaning system of the present invention;

[0024] Figure 2 This is a schematic diagram of the installation and structure of the pneumatic distributor of the cleaning system of the present invention;

[0025] Figure 3 This is a schematic diagram of the main structure of the air-sludge separator in the cleaning system of the present invention;

[0026] Figure 4 This is a rear view schematic diagram of the air-sludge separator in the cleaning system of the present invention;

[0027] Figure 5 This is a top view schematic diagram of the air-sludge separator in the cleaning system of the present invention.

[0028] The names corresponding to each mark in the diagram:

[0029] 1. Main conveying pipe; 2. Suction pipe; 21. Control valve A; 3. Discharge pipe; 31. Control valve B; 4. Air inlet pipe; 41. Control valve C; 5. Air outlet pipe; 51. Control valve D; 6. Pneumatic distributor; 61. Reduced diameter bell mouth; 62. Connecting part; 63. Expanded diameter bell mouth; 7. Air-sludge separator; 71. Separation chamber; 711. Air inlet; 7111. Pressure booster; 712. Collection part; 713. Vent pipe; 714. Turbine; 7141. Sludge hopper; 7142. Power shaft; 715. Defoaming screen; 716. Flushing pipe; 7161. Sludge hopper cleaning nozzle; 7162. Defoaming screen cleaning nozzle; 717. Exhaust pipe; 72. Generator room; 721. Support partition; 722. Generator; 723. Drive belt. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0031] like Figures 1-5 As shown, the pneumatic cleaning system of the present invention is equipped with a pneumatic cleaning pipeline, which includes an air inlet pipe 4 and an air outlet pipe 5. The pneumatic cleaning pipeline is arranged in conjunction with the existing sludge conveying main pipe 1. The air inlet pipe 4 is located behind the sludge suction pipe 2 at the front end of the conveying main pipe 1. The air inlet pipe 4 is tangentially connected to the conveying main pipe 1. A control valve C41 is installed on the air inlet pipe 4. The front end of the air inlet pipe 4 is connected to an air compressor. The sludge suction pipe 2 extends to the bottom of the sludge thickening tank and is connected to the sludge suction pump. A control valve A21 is installed on the sludge suction pipe 2.

[0032] A pneumatic distributor 6 is arranged in the conveying main pipe 1. The pneumatic distributor 6 includes three parts: a reduced diameter bell mouth 61, a connecting part 62, and an expanded diameter bell mouth 63. The end of the conveying main pipe 1 is connected to the air outlet pipe 5 through a tee. The conveying main pipe 1 and the air outlet pipe 5 are located on the same straight line. The other port of the tee faces upward and is connected to the sludge discharge pipe 3. A control valve D51 is installed on the air outlet pipe 5, and a control valve B31 is installed on the sludge discharge pipe 3. The end of the sludge discharge pipe 3 leads to a plate and frame filter press for dewatering the sludge.

[0033] The end of the air outlet pipe 5 is connected to the air-sludge separator 7. The air-sludge separator 7 includes a separation chamber 71 and a power generation chamber 72. An air inlet 711 is provided below the separation chamber 71. The air inlet 711 is connected to the end of the air outlet pipe 5. A pressurizing component 7111 for pressurization is provided at the air inlet 711. A turbine 714 is fixedly installed in the separation chamber 71. A mud collection hopper 7141 is arranged around the turbine 714. The high-pressure air-sludge mixture entering the separation chamber 71 from the air inlet 711 impacts the mud collection hopper 7141.

[0034] A collection section 712 is provided below the turbine 714 in the separation chamber 71. A vent pipe 713 is provided at the bottom of the collection section 712. A defoaming screen 715 is provided above the turbine 714. An exhaust pipe 717 is provided above the separation chamber 71. A flushing pipe 716 is provided on one side of the separation chamber 71. The flushing pipe 716 is divided into two parts. One part is connected to the sludge hopper cleaning nozzle 7161, which cooperates with the sludge hopper 7141. The other part is connected to the defoaming screen cleaning nozzle 7162 arranged around the defoaming screen 715. The angle between the defoaming screen cleaning nozzle 7162 and the horizontal plane is 30-60°, which can achieve full coverage and cleaning of the defoaming screen 715.

[0035] The power shaft 7142 of the turbine 714 is connected to the generator 722 in the power generation room 72. A support partition 721 is provided in the power generation room 72, and the generator 722 is mounted and fixed on the support partition 721. The power shaft 7142 and the rotor of the generator 722 are connected through a transmission belt 723. The electrical energy generated by the generator 722 can be used for the water supply pump of the flushing pipe 716 after being stored.

[0036] The principle of this invention is as follows:

[0037] When using the system of this invention, modifications need to be made to the existing conveying main pipe 1. During the process, an air inlet pipe 4 is set at the front end of the conveying main pipe 1. In order to reduce energy consumption and ensure the air intake effect, the air inlet pipe 4 is tangentially connected to the conveying main pipe 1, and an air compressor is installed at the front end of the air inlet pipe 4. At the end of the conveying main pipe 1, the air outlet pipe 5 and the sludge discharge pipe 3 are connected by a T-junction respectively. The conveying main pipe 1 and the air outlet pipe 5 are arranged horizontally, and the sludge discharge pipe 3 is arranged vertically, which can effectively avoid the accumulation of liquid in the sludge discharge pipe 3. The air-sludge mixture in the air outlet pipe 5 is introduced into the air-sludge separator 7 for the separation of air and sludge. The sludge discharge pipe 3 generally goes to the plate and frame filter press for sludge concentration and dewatering.

[0038] During pneumatic cleaning, since the main conveying pipe 1 is generally long, the flow velocity in the middle of the pipe is fast while the flow velocity around the periphery is slow, which is not conducive to blowing away the mud and water adhering to the pipe wall of the main conveying pipe 1. Therefore, pneumatic distributors 6 are arranged in the main conveying pipe 1 to redistribute the high-pressure airflow by disturbing it, thereby improving the cleaning effect. The number of pneumatic distributors 6 is reasonably matched according to the actual length and specifications of the main conveying pipe 1. In actual use, the pneumatic distributors are arranged at intervals of 20m, which can achieve good results. The diameter of the connecting part 62 in the middle of the pneumatic distributor 6 should be one-half to three-quarters of the diameter of the main conveying pipe 1.

[0039] The air-sludge mixture ejected from the air outlet pipe 5 impacts the turbine 714 in the air-sludge separator 7, causing the turbine 714 to rotate. To ensure the impact effect and prevent sludge accumulation, a pressure booster 7111 is arranged at the air inlet 711 of the air-sludge separator 7. The inside of the pressure booster 7111 is smooth and without dead corners. In actual use, the outlet diameter of the pressure booster 7111 is maintained at one-quarter to one-half of the diameter of the conveying main pipe 1, with good results.

[0040] The gas-sludge mixture entering through the air inlet 711 has high kinetic energy. This mixture impacts the sludge collection hopper 7141 of the turbine 714, reducing its kinetic energy and trapping the sludge. The reduced kinetic energy is converted into the kinetic energy of the turbine 714, which drives the generator 722 to generate electricity. At the same time, the reduction in the kinetic energy of the gas-sludge mixture also reduces the entrainment of sludge by the cleaning gas, which is beneficial to the separation of gas and sludge and ensures the gas-sludge separation effect. The gas with reduced kinetic energy will inevitably carry a small amount of foam, which is broken by the foam-breaking screen 715, and then the low-energy air can be directly discharged.

[0041] During the long-term use of the gas-sludge separator, sludge inevitably accumulates on the sludge collection hopper 7141 and the sludge-accumulating screen 715. At this time, it is necessary to regularly flush the sludge collection hopper 7141 and the sludge collection hopper 7141. During the process, the sludge collection hopper 7141 and the sludge-accumulating screen 715 are flushed through the flushing pipe 716. The flushing water can come from the clean water filtered by the plate and frame filter press or the purified water in the plant area. During the flushing process, the sludge collection hopper cleaning nozzle 7161 is arranged on the opposite side of the air inlet 711. During the process, it can work together with the gas-sludge mixture entering through the air inlet 711 to drive the turbine 714 to generate electricity efficiently and realize the utilization of the kinetic energy of the cleaning water, which is more energy-saving and environmentally friendly.

[0042] The wastewater generated from the above-mentioned rinsing and the mud water generated during the gas-sludge separation process can be returned to the plant's wastewater treatment system or plate and frame filter press for further treatment through the vent pipe 713.

[0043] The electrical energy generated by generator 722 can be used for system loads, such as air compressors and water pumps connected to flushing pipe 716, thereby reducing the energy consumption of the entire system. However, the entire system inevitably needs external power supply. In this process, municipal power supply or the plant's solar power generation system can be used for power supply. It should be noted that the electrical energy generated by generator 722 needs to undergo a series of processing steps before it can be used to supply power to the load, such as energy storage after rectification, filtering and voltage regulation, and then direct or inverted power supply, or direct power supply to the load after voltage regulation and frequency regulation. Since these are existing mature technologies, they will not be described in detail in this invention.

[0044] This invention is not limited to the preferred embodiments described above. Anyone can derive other forms of products under the guidance of this invention. However, regardless of any changes made in their shape or structure, any technical solution that is the same as or similar to this application falls within the protection scope of this invention.

Claims

1. A pneumatic cleaning system for sewage treatment sludge conveying pipelines, comprising a conveying main pipe (1), the front end of which is connected to a sludge suction pipe (2), and the end end of which is connected to a sludge discharge pipe (3), characterized in that: A pneumatic cleaning pipe is attached to the conveying main pipe (1). The pneumatic cleaning pipe includes an air inlet pipe (4) and an air outlet pipe (5). The front end of the air inlet pipe (4) is connected to an air compressor, and the end of the air inlet pipe (4) is connected to the front end of the conveying main pipe (1). The front end of the air outlet pipe (5) is connected to the end of the conveying main pipe (1). The end of the air outlet pipe (5) is connected to the air-sludge separator (7) through an air inlet (711). A pneumatic distributor (6) is arranged in the conveying main pipe (1). A turbine (714) is installed in the air-sludge separator (7). A mud collection hopper (7141) is arranged around the turbine (714). The air-sludge mixture sprayed out by the air outlet pipe (5) impacts the mud collection hopper (7141) of the turbine (714). The power shaft (7142) of the turbine (714) is connected to the generator (722) for transmission. The pneumatic distributor (6) is evenly distributed in the conveying main pipe (1). The pneumatic distributor (6) includes three parts: a reduced diameter flared mouth (61), a connecting part (62), and an expanded diameter flared mouth (63). The diameter of the connecting part (62) is one-half to two-thirds of the diameter of the conveying main pipe (1). The gas-sludge separator (7) is provided with a collection part (712) below the turbine (714), a vent pipe (713) at the bottom of the collection part (712), a defoaming screen (715) above the turbine (714), and an exhaust pipe (717) above the defoaming screen (715). The gas-sludge separator (7) is provided with a flushing pipe (716) on the side opposite to the air inlet (711). The flushing pipe (716) is connected to the sludge hopper cleaning nozzle (7161) and the foam screen cleaning nozzle (7162) respectively. The sludge hopper cleaning nozzle (7161) is matched with the sludge hopper (7141) of the turbine (714), and the foam screen cleaning nozzle (7162) is matched with the foam screen (715). The gas-sludge separator (7) includes two parts: a separation chamber (71) and a power generation chamber (72). The turbine (714) is located in the separation chamber (71), and the generator (722) is located in the power generation chamber (72). The power shaft (7142) of the turbine (714) extends into the power generation chamber (72) and is connected to the rotor of the generator (722) via a drive.

2. The pneumatic cleaning system for sewage treatment sludge conveying pipelines according to claim 1, characterized in that: The air inlet pipe (4) is tangentially connected to the conveying main pipe (1), the front end of the air outlet pipe (5) is connected to the end of the conveying main pipe (1) through a tee, and the other end of the tee is connected to the mud discharge pipe (3). The conveying main pipe (1) and the air outlet pipe (5) are arranged horizontally, and the mud discharge pipe (3) is arranged vertically upward.

3. The pneumatic cleaning system for sewage treatment sludge conveying pipelines according to claim 1, characterized in that: A pressure booster (7111) is arranged at the connection between the air outlet pipe (5) and the gas-sludge separator (7). The diameter of the outlet of the pressure booster (7111) is one-quarter to one-half the diameter of the conveying main pipe (1).

4. The pneumatic cleaning system for sewage treatment sludge conveying pipelines according to claim 1, characterized in that: The foam cleaning nozzle (7162) is arranged above the foam screen (715). The foam cleaning nozzle (7162) is arranged at an angle, and the angle between the foam cleaning nozzle (7162) and the horizontal plane is 30~60°. The cleaning water sprayed by the foam cleaning nozzle (7162) fully covers the foam screen (715).

5. The pneumatic cleaning system for sewage treatment sludge conveying pipelines according to claim 1, characterized in that: The power generation room (72) is provided with a support partition (721), and the generator (722) is fixedly installed on the support partition (721). The rotor of the generator (722) is connected to the power shaft (7142) of the turbine (714) through the transmission belt (723).

6. The pneumatic cleaning system for sewage treatment sludge conveying pipelines according to claim 1, characterized in that: The electrical energy generated by the generator (722) is rectified and stored or regulated and frequency adjusted before being supplied to the system load.

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