Biomimetic sludge bio-drying reactor

Abstract

The application discloses a biomimetic sludge biological drying reactor, which comprises a stainless steel cylinder, the end of the stainless steel cylinder is provided with an air inlet pipe, the air inlet pipe is connected with a Roots blower, the inside of the stainless steel cylinder is kept in a micro-positive pressure state, the side wall and the end of the stainless steel cylinder are provided with a plurality of air outlet holes with threads, the air outlet holes are arranged on the upper half of the cylinder, the air outlet holes are threadedly connected with one end of a threaded stainless steel pipe, the other end of the stainless steel pipe is provided with a PTFE air purification film or a PTFE clothing film, the other end of the stainless steel pipe is screwed with two stainless steel gaskets and an open nut, the PTFE air purification film and the stainless steel pipe form an air filtering unit, and the PTFE clothing film and the stainless steel pipe form a moisture discharging unit. By simulating the principle of skin perspiration, a micro-positive pressure environment is provided by the Roots blower, the air filtering unit and the moisture discharging unit simulate sweat pores, different PTFE films are arranged in the air filtering unit and the moisture discharging unit respectively, water vapor in the inside of the stainless steel cylinder is discharged, and air replacement is simultaneously completed.

Description

TECHNICAL FIELD

[0001] The present application relates to sludge resource disposal technical field, specifically relates to a kind of biomimetic sludge biological drying reactor. BACKGROUND

[0002] Municipal sludge biological drying technology makes full use of the high organic matter characteristics of municipal sludge, and the biological heat energy generated by the degradation of organic matter in the high-temperature aerobic fermentation process of microorganisms is used to remove the water in the sludge quickly by forced ventilation, turning and other methods, so as to realize the harmless, stabilization and reduction of sludge.

[0003] The sludge biological drying process is mainly divided into heating stage, high-temperature stage and cooling stage, and the moisture content is reduced to below 50% in a short time (within 15 days). Studies have shown that the removal of water mainly occurs in the high-temperature stage after the first time reaching 50℃, therefore, how to ensure that the drying pile is in a high-temperature environment for a long time is the key to the efficiency of sludge biological drying. The existing sludge biological drying reactor mainly has the following problems: 1. With the progress of biological drying, a large amount of water vapor is accumulated at the top of the reactor, and the existing reactor mainly removes the water vapor at the top by forced ventilation, at the same time, a large amount of heat in the reactor is also removed, which causes the drying process to enter the cooling period rapidly; 2. With the progress of biological drying reaction, a large amount of ammonia gas and other toxic and harmful odorous gases are produced by microbial metabolism, which are also discharged to the outdoor environment along with the water removal requirement, causing environmental pollution. SUMMARY

[0004] In order to overcome the defects of the prior art, the present application provides a kind of biomimetic sludge biological drying reactor, which simulates the principle of skin perspiration, solves the problem of heat loss caused by water removal, and solves the problem of environmental impact of odorous gases in the biological drying process.

[0005] In order to achieve the above-mentioned purpose of the application, the technical scheme adopted by the present application is as follows:

[0006] The present application provides a kind of biomimetic sludge biological drying reactor, which includes a horizontally placed stainless steel cylinder, the end of the stainless steel cylinder is provided with an air inlet pipe, the air inlet pipe is connected with a Roots blower, the Roots blower continuously aerates the air chamber in the cylinder through the air inlet pipe, the inside of the stainless steel cylinder maintains a slightly positive pressure, and the upper half of the stainless steel cylinder is provided with an air filter unit and a water removal unit.

[0007] Further technical solutions of the present application:

[0008] Preferably, a gear ring is fixedly arranged on the stainless steel cylinder, the gear ring is engaged with a driving gear, and the driving gear is driven by an external motor.

[0009] Preferably, the end of the stainless steel cylinder is provided with a bearing, and the air inlet pipe passes through the bearing.

[0010] Preferably, the air inlet pipe extends into the stainless steel cylinder to connect a movable adapter, the movable adapter is provided with an annular groove, the annular groove is provided with air holes, a sleeve ring is sleeved on the annular groove, the sleeve ring is provided with an air channel in communication with the air holes, and the sleeve ring is provided with a connecting pipe in communication with the end of the air chamber.

[0011] Preferably, the side wall and the end of the stainless steel cylinder are provided with a plurality of threaded air outlet holes arranged on the upper half of the cylinder, the air outlet holes are threadedly connected with one end of a threaded stainless steel pipe, the other end of the stainless steel pipe is provided with a PTFE air purification membrane or a PTFE clothing membrane, the PTFE air purification membrane or the PTFE clothing membrane is screwed on the other end of the stainless steel pipe through two stainless steel gaskets and an open nut, the PTFE air purification membrane and the stainless steel pipe form an air filtration unit, and the PTFE clothing membrane and the stainless steel pipe form a moisture discharge unit.

[0012] Preferably, the outer part of the cylinder of the stainless steel cylinder is wrapped with a layer of nano-silica aerogel insulation felt.

[0013] Preferably, the inner part of the cylinder of the stainless steel cylinder is covered with a layer of PTFE air filtration membrane.

[0014] The present application has the following beneficial effects:

[0015] 1. The bionic sludge biological drying reactor provided by the present application simulates the principle of skin perspiration, provides a micro-positive pressure environment by means of a Roots blower, simulates sweat pores by means of an air filtration unit and a moisture discharge unit, respectively embeds different PTFE membranes to discharge water vapor in the reactor, and simultaneously completes air replacement, the whole device is simple in structure, easy to build and disassemble, and stable in operation.

[0016] 2. The moisture discharge unit of the present application is embedded with a PTFE clothing membrane, compared with the traditional forced ventilation and water removal strategy, the heat loss in the reactor is greatly reduced, the biological drying process is delayed into the cooling period, and the biological drying cycle is shortened.

[0017] 3. The reactor of the present application is covered with a PTFE air filtration membrane and an air filtration unit embedded with a PTFE air purification membrane, which can ensure normal circulation of air, ensure normal respiratory metabolism of the drying pile, and greatly reduce the pollution of large-particle odor generated in the biological drying process to the environment.

[0018] 4. The air filtration unit and water discharge unit provided by the present invention are installed on the upper part of the reactor by threads for easy disassembly and assembly. The PTFE membrane is screwed on the upper part of the passage by a hollow nut and a washer for easy cleaning and replacement. The air and water vapor passages can be reasonably arranged according to the biological drying reaction process, making the actual application more flexible and convenient. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the reactor body structure of the present invention;

[0020] Figure 2 This is an exploded view of the air filter unit structure of the present invention;

[0021] Figure 3 This is an exploded view of the water discharge unit structure of the present invention;

[0022] Figure 4 This is the design drawing of the active adapter of the present invention. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0024] This invention provides a biomimetic sludge biological drying reactor, such as... Figures 1-4 The system includes a horizontally placed stainless steel cylinder 4, with an air inlet pipe 2 at one end. The air inlet pipe 2 is connected to a Roots blower 1, through which the Roots blower 1 continuously aerates the air chamber 5 inside the stainless steel cylinder 4 via the air inlet pipe 2, maintaining a slightly positive pressure inside the stainless steel cylinder 4. The side walls and ends of the stainless steel cylinder 4 are provided with several threaded air outlets, arranged in the upper half of the cylinder. The air outlets are threaded to one end of a threaded stainless steel pipe 10. The other end of the stainless steel pipe 10 is provided with a PTFE air purification membrane 13 or a PTFE clothing membrane 14. The PTFE air purification membrane or PTFE clothing membrane is screwed to the other end of the stainless steel pipe 10 by two stainless steel washers 12 and an open nut 11. The PTFE air purification membrane and the stainless steel pipe 10 form an air filtration unit 8, and the PTFE clothing membrane and the stainless steel pipe 10 form a moisture discharge unit 9.

[0025] The nano-silica aerogel insulation felt 77 wrapped outside the stainless steel cylinder 4 effectively improves the heat insulation performance of the stainless steel cylinder 4, and a PTFE air filtering film 6 is covered inside to ensure that air and water vapor can pass through the air filtering unit 8 and the moisture discharge unit 9 during the rotation of the stainless steel cylinder 4, while ensuring that sludge, auxiliary materials and large-particle harmful gases and other substances cannot be discharged outside the stainless steel cylinder 4, thereby ensuring that the external environment is not affected by the biological drying reaction.

[0026] The PTFE air purification film is screwed on the upper end of the air discharge unit through two stainless steel gaskets 12 and open nuts 11, and under the condition of micro-positive pressure, on the one hand, it is used for pressure relief to discharge air in the stainless steel cylinder 4 to complete air replacement and ensure the aerobic respiration condition of microorganisms, and on the other hand, it further purifies the gases generated in the biological drying process; the PTFE clothing film is screwed on the upper end of the moisture discharge unit 9 through two stainless steel gaskets 12 and open nuts 11, and under the condition of micro-positive pressure, the water vapor inside the stainless steel cylinder 4 is discharged to achieve the effect of biological drying and water removal; the air filtering unit 8 and the moisture discharge unit 9 with two threaded ends, and the PTFE film fixed by the gasket and the open nut 11 are convenient to disassemble and install during use, and the proportion of the air filtering unit 8 and the moisture discharge unit 9 can be reasonably arranged according to the biological drying reaction process.

[0027] It should be noted that the PTFE air purification film in the air filtering unit 8 is a microporous film formed by polytetrafluoroethylene (PTFE) expansion and stretching, which can filter all dust particles including bacteria while maintaining air flow, achieving the purpose of purification and ventilation.

[0028] The PTFE clothing film in the moisture discharge unit 9 is a microporous film made of polytetrafluoroethylene plastic resin by a two-way stretching method. The film surface can reach more than a billion micropores per square centimeter, and each micropore has a diameter of 0.1-0.5 microns, which has the property of allowing water vapor molecules (0.0003-0.0004 microns) to pass through. In addition, because the pores are extremely small and arranged in a longitudinal irregular curve, air flow is not easy to pass through.

[0029] The PTFE air filtering film covered inside the stainless steel cylinder 4 is a polytetrafluoroethylene microporous film, which has a smooth surface, is resistant to chemicals, has a long service life, can play a role in air purification and dust removal, and can be reused, thereby ensuring that sludge, auxiliary materials and large-particle harmful gases and other substances cannot be discharged outside the stainless steel cylinder 4.

[0030] In order to verify the biological drying efficiency of the device, about 80% of the dewatered sludge with a moisture content of about 80% was selected, sawdust was used as an auxiliary material, and a bacteria agent was used in the following three groups of experiments:

[0031] Blank control group (CK): take fresh dewatering sludge 75 kg and sawdust 25 kg, add 1 kg of self-made bacterial agent, mix evenly, and then add to the original sludge bio-drying stainless steel cylinder in the laboratory. The initial moisture content of the pile is about 67%, and intermittent aeration (10 min-on / 20 min-off, air volume is set to 40 L / min) is adopted in combination with the overturning strategy (overturning every 4 h, 5 turns each time).

[0032] Experimental group (T-1): take fresh dewatering sludge 75 kg and sawdust 25 kg, add 1 kg of self-made bacterial agent, mix evenly, and then add to the sludge bio-drying stainless steel cylinder of the application. The initial moisture content of the pile is about 67%, and intermittent aeration is adopted to maintain the same ventilation as the CK group (air volume is set to 13.33 L / min) in combination with the overturning strategy (overturning every 4 h, 5 turns each time).

[0033] Experimental group (T-2): keep the rest of the experimental conditions unchanged, and increase the aeration amount by one time (air volume is set to 26.66 L / min).

[0034] The highest temperature of the blank control group CK is 69.7℃, and the high temperature period lasts for 52h, and the moisture content decreases from 66.54% to 52.37% in 12 days. The highest temperature of the experimental group T-1 of the sludge bio-drying stainless steel cylinder of the application is 71.4℃, and the high temperature period lasts for 96h. From the CK group and the previous experiment, it is known that the removal of water in the bio-drying process mainly occurs in the high temperature period, so the proportion of air and water vapor discharge passage is 1:5 in the high temperature period, and the proportion of air discharge passage is increased to 1:1 in the cooling period, which accelerates the air circulation. Therefore, the moisture content of the T-1 group decreases from 67.31 to 40.28% in 12 days. The T-2 group increases the aeration amount, and the high temperature is only 63.2℃, but the high temperature period still has 71h, and the moisture content decreases from 67.72% to 43.74% in 12 days.

[0035] The gear type gear ring 15 is fixed on the stainless steel cylinder 4, and the gear type gear ring is engaged with the driving gear 3. It should be noted that the driving gear 3 in the application is driven by external power, such as a motor. This driving mode is a conventional driving mode, and the application will not be described in detail.

[0036] The air inlet pipe 2 extends into the stainless steel cylinder 4 and is connected to the movable adapter 18. The movable adapter is provided with an annular groove 19, and the annular groove is provided with air holes 20. The annular groove is provided with a sleeve ring 21, and the sleeve ring is provided with an air duct 22 which is in communication with the air holes. The sleeve ring is provided with a connecting pipe 23 which is in communication with the end of the air chamber 5, thereby realizing the communication between the air inlet pipe 2 and the air chamber 5, and the air chamber 5 rotates with the stainless steel cylinder when the stainless steel cylinder rotates.

[0037] It should be noted that the end of the stainless steel cylinder is provided with a bearing, and the air inlet pipe penetrates through the bearing, so that the air inlet pipe does not affect the rotation of the stainless steel cylinder.

[0038] The above is only an example and a description of the structure of the present application, and those skilled in the art can make various modifications or supplements to the described specific embodiments or use similar ways to replace, as long as the modifications or supplements do not deviate from the structure of the present application or exceed the scope defined by the present application, and should belong to the protection scope of the present application.

Claims

1. A biomimetic sludge bio-drying reactor characterized in that, Including transverse placement of stainless steel cylinder, the end of the stainless steel cylinder is provided with air inlet pipe, the air inlet pipe is connected with roots blower, the roots blower is continuously aerated to the cylinder air chamber of the stainless steel cylinder through the air inlet pipe, the inside of the stainless steel cylinder keeps the state of micro-positive pressure, the upper half of the stainless steel cylinder is provided with air filter unit and moisture discharge unit; The side wall and the end of the stainless steel cylinder are provided with a plurality of threaded air outlet holes, which are arranged in the upper half of the cylinder, the air outlet holes are threadedly connected with one end of the threaded stainless steel pipe at the end, the other end of the stainless steel pipe is provided with a PTFE air purification membrane or a PTFE clothing membrane, the PTFE air purification membrane or the PTFE clothing membrane is screwed to the other end of the stainless steel pipe through two stainless steel gaskets and an open nut, the PTFE air purification membrane and the stainless steel pipe constitute an air filter unit, and the PTFE clothing membrane and the stainless steel pipe constitute a moisture discharge unit.

2. A biomimetic sludge bio-drying reactor as claimed in claim 1, wherein, A gear type gear ring is fixedly arranged on the stainless steel cylinder, the gear type gear ring is engaged with a driving gear, and the driving gear is driven by an external motor.

3. A biomimetic sludge bio-drying reactor as claimed in claim 2, wherein, The end of the stainless steel cylinder is provided with a bearing, and the air inlet pipe penetrates through the bearing.

4. A biomimetic sludge bio-drying reactor as claimed in claim 3, wherein, The air inlet pipe extends into the stainless steel cylinder and is connected with a movable adapter, the movable adapter is provided with an annular groove, the annular groove is provided with an air hole, a sleeve ring is sleeved on the annular groove, an air channel is arranged in the sleeve ring and communicates with the air hole, and a connecting pipe is arranged on the sleeve ring and communicates with the end of the air chamber.

5. A biomimetic sludge bio-drying reactor as claimed in claim 1, wherein, The outer part of the stainless steel cylinder is wrapped with a layer of nano-silica aerogel insulation felt.

6. A biomimetic sludge bio-drying reactor as claimed in claim 5, wherein, The inside of the stainless steel cylinder is covered with a layer of PTFE air filter membrane.

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