Microwave tempering and separating device for belt filter press

Abstract

The utility model relates to a microwave tempering and separating device for a belt filter press, which belongs to the technical field of sewage and sludge treatment equipment and comprises a belt filter press, a conditioning barrel is arranged at the front end of the belt filter press, a microwave reactor communicated with the belt filter press is arranged between the upper portion of the conditioning barrel and the belt filter press, and the microwave reactor is communicated with the belt filter press. A microwave resonant cavity is arranged in the microwave reactor, a water vapor condensation backflow device communicated with the microwave resonant cavity is arranged at the upper end of the microwave reactor, a liquid extraction pipe is arranged between the microwave reactor and the lower part of the conditioning barrel, and a liquid extraction pump is arranged between the liquid extraction pipe and the conditioning barrel. The device has the characteristics of compact structure, convenience in operation and high dehydration efficiency. The temperature is quickly increased within a short time, so that a microbial structure in sludge floc is destroyed, some bound water is released to become free water which is easily removed by a mechanical method, the dehydration performance of the sludge is improved, and the sludge becomes a sludge cake with lower water content after entering mechanical dehydration.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage sludge treatment equipment, in particular to a microwave conditioning separation device for a belt filter press. Background Art

[0002] In the process of urban sewage treatment, biological treatment technology is mostly used. As a process product of biological treatment technology, activated sludge contains a large amount of substances including inorganic particles, bacterial cells, colloids, water, etc. It has complex composition and has both pollution and resource attributes. On this basis, proper treatment of activated sludge will effectively prevent the occurrence of environmental pollution and waste of resources, and the emission reduction benefits of sewage treatment facilities will be greatly increased.

[0003] The moisture content of sludge is an important factor that restricts sludge treatment and disposal. Sludge with high moisture content contains a large amount of organic matter that is easy to decay, and the heavy metal elements and harmful microorganisms contained in it are also easily released into the environment, causing secondary pollution, which has an adverse effect on the subsequent landfill, incineration, and resource utilization of sludge. In addition, it is bulky and not conducive to transportation. Common sludge dehydration methods include gravity concentration, natural drying, mechanical dehydration, and sludge thermal drying. Sludge dehydration in urban sewage treatment plants in my country is mainly achieved by gravity concentration to reduce the sludge moisture content to 95%~98%, and mechanical dehydration to reduce the solid water content of sludge to 60%~80%. After the sludge volume is greatly reduced, the mud cake is transported out for drying and disposal. Therefore, mechanical sludge dehydration is particularly important in the process of municipal sewage treatment.

[0004] The main mechanical sludge dewatering equipment includes plate and frame filter press, drum centrifuge and belt filter press. The ordinary belt filter press is mainly composed of a drive device, a frame, a press roller, an upper filter belt, a lower filter belt, a filter belt tensioning device, a filter belt cleaning device, a discharge device, a pneumatic control system, an electrical control system, etc. After adding flocculants and stirring in the sludge conditioning tank, the sludge enters the gravity dewatering section of the filter belt, and then is pre-pressed by a wedge-shaped roller and enters a number of press rollers of different diameters, so that the concentrated sludge is continuously pressed between the upper and lower filter belts to squeeze out water to form a mud cake, and finally the mud cake is scraped off by a scraper. However, during the dewatering process of sludge, the activity of microorganisms inside the sludge affects the dewatering effect. The types and quantities of bacterial colonies, fungi and other microorganisms in the sludge will affect the dewatering effect of the sludge. Summary of the invention

[0005] The utility model mainly solves the deficiencies existing in the prior art and provides a microwave conditioning and separation device for a belt filter press, which has the characteristics of compact structure, convenient operation and high dehydration efficiency. Since microwaves have good penetration and selective heating characteristics, the water molecules in the sludge are polar molecules with a large dielectric constant and strong absorption capacity for microwave radiation. They heat up quickly in a short time, thereby destroying the microbial structure in the sludge flocs, releasing some bound water to become free water that is easy to remove by mechanical methods, improving the dehydration performance of the sludge, and after entering the mechanical dehydration, the sludge becomes a mud cake with a low moisture content.

[0006] The above technical problems of the utility model are mainly solved by the following technical solutions:

[0007] A microwave conditioning and separation device for a belt filter press comprises a belt filter press, wherein a conditioning barrel is arranged at the front end of the belt filter press, a microwave reactor connected to the belt filter press is arranged between the upper part of the conditioning barrel and the belt filter press, a microwave resonance cavity is arranged in the microwave reactor, a water vapor condensation reflux device connected to the microwave resonance cavity is arranged at the upper end of the microwave reactor, a liquid extraction pipe is arranged between the microwave reactor and the lower part of the conditioning barrel, and a liquid extraction pump is arranged between the liquid extraction pipe and the conditioning barrel.

[0008] The microwave reactor uses microwave power automatic frequency conversion control and non-pulse continuous microwave heating technology, and uses a high-precision non-contact infrared temperature sensor to monitor and control the temperature in the reaction vessel in real time. It is also equipped with electromagnetic and mechanical stirring methods. During the reaction process, condensation reflux, dripping and water separation operations are performed. A microwave generator is installed in the microwave resonant cavity.

[0009] Preferably, an ultrasonic level meter connected to the microwave resonance cavity is provided on the side of the water vapor condensation reflux device, and a temperature sensor connected to the microwave resonance cavity is provided between the ultrasonic level meter and the water vapor condensation reflux device.

[0010] The ultrasonic level meter and temperature sensor monitor the liquid level and temperature changes of the sludge being treated, and then the controller in the control box controls the continuous microwave generator to control the microwave action time and microwave power to change the microwave effect. Alternatively, the sludge delivery pump in the conditioning barrel is controlled to control the sludge residence time to change the microwave effect.

[0011] Preferably, the water vapor condenser reflux device comprises a reflux pipe, in which a water vapor collecting pipe connected to the microwave resonance cavity and the reflux pipe is arranged, and between the water vapor collecting pipe and the reflux pipe, a plurality of staggered and fixed condensation rings are arranged.

[0012] Preferably, the lower end of the water vapor collection tube is provided with a collection cover connected to the microwave resonance cavity.

[0013] Preferably, an overflow pipe connected to the reflux pipe is provided between the lower end of the rear portion of the microwave reactor and the belt filter press, and an overflow valve is provided on the overflow pipe.

[0014] Preferably, a sludge delivery pump connected to the conditioning barrel is provided at the upper end of the conditioning barrel.

[0015] Preferably, a sewage pipe connected to the conditioning barrel is provided at the lower side end of the conditioning barrel.

[0016] The utility model can achieve the following effects:

[0017] The utility model provides a microwave conditioning separation device for a belt filter press, which has the characteristics of compact structure, convenient operation and high dehydration efficiency compared with the prior art. Since microwaves have good penetration and selective heating characteristics, the water molecules in the sludge are polar molecules with a large dielectric constant and strong absorption capacity for microwave radiation. The temperature rises rapidly in a short time, thereby destroying the microbial structure in the sludge flocs, releasing some bound water to become free water that is easy to remove by mechanical methods, improving the dehydration performance of the sludge, and after entering the mechanical dehydration, the sludge becomes a mud cake with a low moisture content. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model.

[0019] Figure 2 It is a structural schematic diagram of the water vapor condensation reflux device in the utility model.

[0020] In the figure: belt filter press 1, ultrasonic level meter 2, temperature sensor 3, water vapor condenser reflux device 4, microwave reactor 5, sludge conveying pump 6, liquid extraction pipe 7, conditioning barrel 8, sewage pipe 9, liquid extraction pump 10, microwave resonant cavity 11, overflow valve 12, overflow pipe 13, reflux pipe 14, condensation ring 15, water vapor collection pipe 16, collection cover 17. DETAILED DESCRIPTION

[0021] The technical solution of the utility model is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0022] Example: Figure 1 and Figure 2As shown, a microwave conditioning and separation device for a belt filter press comprises a belt filter press 1, a conditioning barrel 8 is provided at the front end of the belt filter press 1, a microwave reactor 5 connected to the belt filter press 1 is provided between the upper part of the conditioning barrel 8 and the belt filter press 1, a microwave resonance cavity 11 is provided in the microwave reactor 5, a water vapor condenser reflux device 4 connected to the microwave resonance cavity 11 is provided at the upper end of the microwave reactor 5, the steam condenser reflux device 4 comprises a reflux pipe 14, a water vapor collection pipe 16 connected to the microwave resonance cavity 11 and the reflux pipe 14 is provided in the reflux pipe 14, and 8 staggered condensation rings 15 are provided between the water vapor collection pipe 16 and the reflux pipe 14. A collection cover 17 connected to the microwave resonance cavity 11 is provided at the lower end of the water vapor collection pipe 16. An overflow pipe 13 connected to the reflux pipe 14 is provided at the lower end of the rear part of the microwave reactor 5 and the belt filter press 1, and an overflow valve 12 is provided on the overflow pipe 13. An ultrasonic level meter 2 connected to the microwave resonant cavity 11 is provided on the side of the water vapor condensation reflux device 4, and a temperature sensor 3 connected to the microwave resonant cavity 11 is provided between the ultrasonic level meter 2 and the water vapor condensation reflux device 4. A liquid extraction pipe 7 is provided between the microwave reactor 5 and the lower part of the conditioning barrel 8, and a liquid extraction pump 10 is provided between the liquid extraction pipe 7 and the conditioning barrel 8. A sludge conveying pump 6 connected to the conditioning barrel 8 is provided at the upper end of the conditioning barrel 8. A sewage discharge pipe 9 connected to the conditioning barrel 8 is provided at the lower side end of the conditioning barrel 8.

[0023] The sludge in the conditioning barrel 8 is pumped into the microwave reactor 5 through the sludge pump, and flows into the belt filter press 1 by gravity after microwave reaction. Microwave radiation causes the negatively charged sludge particles and the water molecules therein to continuously accelerate, rotate, and collide with each other through the high-frequency electromagnetic field, so that the sludge particles are destabilized and flocculated, and the particles become coarse, which promotes the improvement of the sludge dehydration performance. When the sludge enters the belt filter press 1, the sludge dehydration rate is effectively improved.

[0024] The microwave resonant cavity 11 is mainly composed of a metal cavity and a coupling structure; the metal cavity adopts a hollow metal box or a resonant cavity, which has excellent electromagnetic shielding and leakage loss characteristics. The coupling structure is used to introduce and extract microwave signals from the cavity, usually in the form of coupling limiting holes or coupling needles. The working principle of microwave generation is achieved by converting electrical energy into microwave energy. First, the continuous microwave generator of the sludge microwave conditioning and separation device generates a high-frequency oscillation signal. Then the oscillation signal enters the amplifier: the microwave resonant cavity 11 and amplifies it to a certain power level. Finally, through the coupler, the electrical energy is converted into microwave energy. The coupler introduces the power of the microwave resonant cavity 11 into a pipe called a "waveguide". The structure inside the waveguide guides the microwave energy to propagate along the pipe and controls the emission direction and power distribution of the microwave. Finally, the radiation acts on the microwave reactor 5.

[0025] In summary, the microwave conditioning and separation device for belt filter press has the characteristics of compact structure, convenient operation and high dehydration efficiency. Since microwaves have good penetration and selective heating characteristics, the water molecules in the sludge are polar molecules with a large dielectric constant and strong absorption capacity for microwave radiation. They heat up quickly in a short time, thereby destroying the microbial structure in the sludge flocs, releasing some bound water to become free water that is easy to remove by mechanical methods, improving the dehydration performance of the sludge, and after entering the mechanical dehydration, the sludge becomes a mud cake with a low moisture content.

[0026] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numerals in the claims should not be regarded as limiting the claims involved.

[0027] In summary, the above description is only a specific embodiment of the present invention, but the structural features of the present invention are not limited thereto. Any changes or modifications made by any technician in the field of the present invention are included in the patent scope of the present invention.

Claims

1. A microwave conditioning and separation device for a belt filter press, comprising a belt filter press (1), characterized in that: The front end of the belt filter press (1) is provided with a conditioning barrel (8), a microwave reactor (5) connected to the belt filter press (1) is provided between the upper part of the conditioning barrel (8) and the belt filter press (1), a microwave resonance cavity (11) is provided in the microwave reactor (5), a water vapor condenser reflux device (4) connected to the microwave resonance cavity (11) is provided at the upper end of the microwave reactor (5), a liquid extraction pipe (7) is provided between the microwave reactor (5) and the lower part of the conditioning barrel (8), and a liquid extraction pump (10) is provided between the liquid extraction pipe (7) and the conditioning barrel (8).

2. The microwave conditioning and separation device for a belt filter press according to claim 1, characterized in that: An ultrasonic level meter (2) connected to the microwave resonance cavity (11) is provided on the side of the water vapor condenser reflux device (4), and a temperature sensor (3) connected to the microwave resonance cavity (11) is provided between the ultrasonic level meter (2) and the water vapor condenser reflux device (4).

3. The microwave conditioning and separation device for a belt filter press according to claim 1, characterized in that: The water vapor condenser reflux device (4) comprises a reflux pipe (14), wherein a water vapor collecting pipe (16) connected to the microwave resonant cavity (11) and the reflux pipe (14) is provided inside the reflux pipe (14), and a plurality of condensation rings (15) which are staggered and fixedly connected are provided between the water vapor collecting pipe (16) and the reflux pipe (14).

4. The microwave conditioning and separation device for a belt filter press according to claim 3, characterized in that: The lower end of the water vapor collection pipe (16) is provided with a collection cover (17) which is connected to the microwave resonance cavity (11).

5. The microwave conditioning and separation device for a belt filter press according to claim 3, characterized in that: An overflow pipe (13) connected to the reflux pipe (14) is provided between the rear lower end of the microwave reactor (5) and the belt filter press (1), and an overflow valve (12) is provided on the overflow pipe (13).

6. The microwave conditioning and separation device for a belt filter press according to claim 1, characterized in that: A sludge delivery pump (6) connected to the conditioning barrel (8) is provided at the upper end of the conditioning barrel (8).

7. The microwave conditioning and separation device for a belt filter press according to claim 1, characterized in that: A sewage discharge pipe (9) connected to the conditioning barrel (8) is provided at the lower side end of the conditioning barrel (8).

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