Fenton sludge pyrolysis recycling device

Abstract

The invention relates to the technical field of environmental protection, and discloses a Fenton sludge pyrolysis recycling device which comprises a heating system, a sludge rolling and conveying system and a pyrolysis gas collecting and conveying system, the heating system comprises an inner cylinder and a heat storage assembly; a flame gun is mounted on one side of the inner barrel, and a smoke outlet is formed in the other side of the inner barrel; the heat storage assembly is installed on the inner wall of the inner barrel, and an air inlet structure is arranged on the side wall, close to the flame gun, of the inner barrel. The sludge rolling conveying system comprises an outer cylinder and an auger conveying assembly; the inner cylinder is sleeved with the outer cylinder, and the auger conveying assembly is installed between the inner cylinder and the outer cylinder. A feeding assembly and a discharging assembly are installed on the two sides of the outer cylinder correspondingly. The pyrolysis gas collecting and conveying system comprises a heat preservation assembly, a pyrolysis gas collecting pipe and a pyrolysis gas conveying pipe, and filtering equipment and a fan are installed on the pyrolysis gas conveying pipe. Self-burning of pyrolysis gas in the device can be achieved, the overall heat utilization rate and the treatment effect are improved, the structure is simple, the space utilization rate is high, starting and stopping are convenient, and the manufacturing cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of environmental protection, in particular to a Fenton sludge pyrolysis resource device. BACKGROUND

[0002] Sludge pyrolysis is to use the thermal instability of organic matter in sludge to heat it under anaerobic conditions to make organic matter produce thermal cracking and form valuable gas or residue, which provides an effective way for sludge reduction, stabilization, harmlessness and resource utilization. Fenton sludge can be prepared into Fenton-like catalyst or iron powder with high iron content by pyrolysis. Some organic materials are generally added to produce reducing substances during pyrolysis to reduce ferric iron in Fenton sludge to produce Fenton-like catalyst or iron powder with better quality.

[0003] The sludge pyrolysis device is a special equipment for pyrolysis of sludge. In the prior art, the sludge pyrolysis device is usually a reaction tube or a kiln for pyrolysis, and the conveying mode is usually an auger. Directly using a general reaction tube or kiln for pyrolysis and resource utilization of Fenton sludge has problems such as insufficient use of internal space of the reaction tube or kiln and low heat utilization rate.

[0004] Therefore, a Fenton sludge pyrolysis resource device is provided. SUMMARY

[0005] The purpose of the present application is to provide a Fenton sludge pyrolysis resource device, which aims to solve or improve at least one of the above technical problems.

[0006] To achieve the above purpose, the present application provides the following scheme: the present application provides a Fenton sludge pyrolysis resource device, which comprises: a heating system, the heating system comprising an inner cylinder and a heat storage assembly; one side of the inner cylinder is provided with a flame gun, and the other side is provided with a smoke exhaust port; the heat storage assembly is installed on the inner wall of the inner cylinder, and the side wall of the inner cylinder close to the flame gun is provided with an air inlet structure; a sludge tumbling conveying system, the sludge tumbling conveying system comprising an outer cylinder and an auger conveying assembly; the outer cylinder is sleeved outside the inner cylinder, and the auger conveying assembly is installed between the inner cylinder and the outer cylinder; the outer cylinder is respectively provided with an inlet assembly and a discharge assembly on both sides; a pyrolysis gas collection and conveying system, the pyrolysis gas collection and conveying system comprising a heat preservation assembly, a pyrolysis gas collection pipe and a pyrolysis gas conveying pipe; the pyrolysis gas collection pipe is fixedly connected with the outer wall of the outer cylinder and communicates with the outer wall; one end of the pyrolysis gas conveying pipe is fixedly connected with the pyrolysis gas collection pipe, and the other end extends into the inner cavity of the inner cylinder; a filter device and a fan are installed on the pyrolysis gas conveying pipe; the heat preservation assembly is sleeved outside the pyrolysis gas conveying pipe and the outer cylinder; wherein, the auger conveying assembly is provided with a partition structure.

[0007] The Fenton sludge pyrolysis recycling device provided by the application comprises a screw conveyor assembly, A rotating disc bearing is sleeved on the outer wall of the inner cylinder; one side of the outer wall of the rotating disc bearing is provided with a gear ring; Screw blade, the screw blade is installed on the rotating disc bearing through a fixing part; the screw blade is located in the outer cylinder, and the partition plate structure is installed on the screw blade; A motor is installed on the outer wall of the outer cylinder, the output shaft of the motor is provided with a gear, and the gear is in meshing transmission with the gear ring.

[0008] The Fenton sludge pyrolysis recycling device provided by the application comprises a screw conveyor assembly,

[0009] The Fenton sludge pyrolysis recycling device provided by the application comprises a screw conveyor assembly, The discharge assembly comprises a discharge port, the discharge port is installed on the bottom surface of the outer cylinder, and the feeding port and the discharge port are located on the two sides of the outer cylinder respectively; The bottom of the discharge port is provided with a storage bin, and a spring door is installed between the discharge port and the storage bin.

[0010] The Fenton sludge pyrolysis recycling device provided by the application comprises a screw conveyor assembly,

[0011] The Fenton sludge pyrolysis recycling device provided by the application comprises a screw conveyor assembly,

[0012] The Fenton sludge pyrolysis recycling device provided by the application comprises a screw conveyor assembly,

[0013] The spring door comprises a metal door, the metal door is rotationally connected to the bottom of the discharge port through a rotating shaft, and a return spring is installed between the metal door and the inner wall of the storage bin.

[0014] The Fenton sludge pyrolysis resource device comprises a feeding port, and a screw conveyor device is installed in the feeding port.

[0015] The air inlet structure comprises a plurality of air inlet holes, and the plurality of air inlet holes are arranged on the side wall of the inner cylinder close to the flame gun at intervals.

[0016] The present application discloses the following technical effects: The Fenton sludge pyrolysis resource device has the advantages of simple structure, low manufacturing cost, easy operation and maintenance, convenient start and stop, and the like. The Fenton sludge pyrolysis resource device has the advantages of simple structure, low manufacturing cost, easy operation and maintenance, convenient start and stop, and the like. The Fenton sludge pyrolysis resource device has the advantages of simple structure, low manufacturing cost, easy operation and maintenance, convenient start and stop, and the like. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments.

[0018] Fig. 1 The present application discloses the following technical effects: The present application discloses the following technical effects: Fig. 2 It is a schematic view of the cross-section structure of the present application. Fig. 3 It is a schematic view of the structure of the partition in the present application.

[0019] Wherein, 1, flame gun; 2, thermocouple; 3, discharge port; 4, spring door; 5, storage bin; 6, heat preservation layer; 7, partition; 8, auger blade; 9, heat accumulator; 10, gear; 11, motor; 12, rotary table bearing; 13, shell; 14, feed inlet; 15, filtering equipment; 16, fan; 17, outer cylinder; 18, pyrolysis gas collecting pipe; 19, pyrolysis gas collecting hole; 20, fixed part; 21, pyrolysis gas conveying pipe; 22, inner cylinder; 23, air inlet hole. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0021] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0022] With reference to Figs. 1-3 The present application provides a Fenton sludge pyrolysis resource device, comprising: A heating system, which comprises an inner cylinder 22 and a heat storage assembly; the inner cylinder 22 is provided with a flame gun 1 on one side and a smoke outlet on the other side; the heat storage assembly is installed on the inner wall of the inner cylinder 22, and the side wall of the inner cylinder 22 close to the flame gun 1 is provided with an air inlet structure; A sludge tumbling conveying system, which comprises an outer cylinder 17 and an auger conveying assembly; the outer cylinder 17 is sleeved outside the inner cylinder 22, and the auger conveying assembly is installed between the inner cylinder 22 and the outer cylinder 17; the outer cylinder 17 is provided with a feeding assembly and a discharging assembly on both sides respectively; A pyrolysis gas collecting and conveying system, which comprises a heat preservation assembly, a pyrolysis gas collecting pipe 18 and a pyrolysis gas conveying pipe 21; the pyrolysis gas collecting pipe 18 is fixedly connected with the outer wall of the outer cylinder 17 and communicates with the outer cylinder 17, one end of the pyrolysis gas conveying pipe 21 is fixedly connected with the pyrolysis gas collecting pipe 18, the other end extends into the inner cavity of the inner cylinder 22, and the pyrolysis gas conveying pipe 21 is provided with a filtering equipment 15 and a fan 16; the heat preservation assembly is sleeved outside the pyrolysis gas conveying pipe 21 and the outer cylinder 17; Wherein, the auger conveying assembly is provided with a partition structure; With the arrangement, the application has simple structure, low manufacturing cost, easy operation and maintenance, and convenient start and stop; the gas generated in the pyrolysis process is collected through the pyrolysis gas collecting pipe 18, the tar and dust in the pyrolysis gas are removed through the filtering device 15, and then the pyrolysis gas is discharged into the flame area in the inner cavity of the inner cylinder 22 through the fan 16 and the pyrolysis gas conveying pipe 21, and is burned by the flame gun 1, without the need of additionally arranging a flue gas treatment unit, and the pyrolysis gas is self-burned in the high-temperature environment formed by the flame gun 1 in the inner cylinder 22, which not only simplifies the overall process, avoids the environmental protection problem caused by the discharge of the pyrolysis gas, but also enables the heat released by the burning of the pyrolysis gas to assist the heating of the inner cylinder 22, reduces the energy waste, and improves the processing efficiency; The application can effectively store the heat generated by the flame gun 1 through the heat storage assembly, avoids the rapid loss of heat, buffers the temperature fluctuation, ensures that the stable temperature environment required for pyrolysis is maintained in the area of the heat storage assembly of the inner cylinder 22, and enables the organic matter in the sludge to be more fully pyrolyzed; in addition, the heat released by the burning of the pyrolysis gas further supplements the heat source of the inner cylinder 22, reduces the consumption of external energy, forms heat recycling, and greatly improves the overall heat utilization rate; The application can drive the sludge to uniformly roll and spread between the inner cylinder 22 and the outer cylinder 17 through the auger conveying assembly and the spacer structure, enables the sludge to fill most of the internal space, and only reserves a small amount of space for temporary storage of the pyrolysis gas, which not only improves the space utilization rate, increases the processing amount of the sludge at a time, but also ensures that the sludge is uniformly heated, avoids local overheating or unpyrolyzed conditions, and improves the processing effect.

[0023] In a further optimization scheme, the filtering device 15 adopts a metal wire filter screen, and in the embodiment, a filter screen made of stainless steel is preferably used, and after use, the filter screen can be placed in the flame area of the flame gun to burn off the tar and other substances.

[0024] In a further optimization scheme, since there is hydrogen and methane in the pyrolysis gas, the fan 16 adopts an explosion-proof axial flow fan.

[0025] In a further optimization scheme, the diameter of the pyrolysis gas collecting pipe 18 is 3cm-5cm.

[0026] In a further optimization scheme, the flame gun 1 adopts an oil-fired or gas-fired type, and in the embodiment, a flame gun that burns natural gas is preferably used.

[0027] In a further optimization scheme, the inner cylinder 22 and the outer cylinder 17 both adopt stainless steel pipes, the diameter of the inner cylinder 22 is 20cm-50cm, and the diameter of the outer cylinder 17 is 10cm-20cm larger than that of the inner cylinder 22.

[0028] In a further optimization scheme, the auger conveying assembly includes: The turntable bearing 12 is sleeved on the outer wall of the inner cylinder 22; and the outer wall of the turntable bearing 12 is provided with a gear ring on one side. The auger blade 8 is installed on the rotary disc bearing 12 through the fixing part 20, and the auger blade 8 is located in the outer cylinder 17, and the baffle structure is installed on the auger blade 8. The motor 11 is installed on the outer wall of the outer cylinder 17, the output shaft of the motor 11 is provided with the gear 10, the gear 10 is engaged with the gear ring to drive, the outer cylinder 17 is provided with a avoiding opening, and the gear 10 and the gear ring penetrate through the avoiding opening.

[0029] In a further optimization scheme, the baffle structure includes a plurality of baffles 7, and a plurality of baffles 7 are installed between adjacent two auger blades 8, the plurality of baffles 7 are arranged at equal intervals in the circumferential direction of the rotary disc bearing 12, and the baffle 7 is provided with a notch; in this embodiment, 6-10 baffles 7 are symmetrically arranged on each auger blade 8; the baffle 7 is in the shape of a “jia” character; part of the sludge can be left at the bottom of the auger blade, and the auger blade 8 can be rotated to the discharge port 3 direction, and most of the sludge can be rolled up and fully contacted with the outer surface of the inner cylinder 22 for pyrolysis.

[0030] In a further optimization scheme, the feeding assembly includes a feeding port 14, and the feeding port 14 is installed on the top surface of the outer cylinder 17. The discharging assembly includes a discharge port 3, and the discharge port 3 is installed on the bottom surface of the outer cylinder 17; the feeding port 14 and the discharge port 3 are located on the two sides of the outer cylinder 17, respectively. The bottom of the discharge port 3 is provided with a storage bin 5, and the spring door 4 is installed between the discharge port 3 and the storage bin 5.

[0031] In a further optimization scheme, the heat storage assembly includes a thermocouple 2 and a heat storage body 9, the heat storage body 9 is installed on the inner wall of the inner cylinder 22, the detection end of the thermocouple 2 extends into the heat storage body 9, the heat storage body 9 adopts a ceramic heat storage body, the main components of the ceramic heat storage body can be mullite and silicon carbide materials, and the overall shape is cylindrical.

[0032] In a further optimization scheme, the heat preservation assembly includes a heat preservation layer 6 and an outer shell 13, the heat preservation layer 6 is sleeved outside the pyrolysis gas conveying pipe 21 and the outer cylinder 17, and the outer shell 13 is sleeved outside the heat preservation layer 6; the material of the heat preservation layer 6 is any one or several of ceramic fiber, rock wool and aluminum silicate insulation cotton material, and the tolerance limit temperature is close to 1000 DEG C; the heat preservation layer 6 and the outer shell 13 are used to avoid the condensation of tar in the pyrolysis gas in the pyrolysis gas collecting pipe 18 and the pyrolysis gas collecting hole 19, and to improve the heat utilization rate.

[0033] In a further optimization scheme, the pyrolysis gas collecting pipe 18 is provided with two groups of collecting hole groups, each collecting hole group includes a plurality of pyrolysis gas collecting holes 19 arranged at equal intervals, the pyrolysis gas collecting holes 19 of the two groups of collecting hole groups are arranged alternately, the outer wall top of the outer cylinder 17 is provided with an exhaust gap, and the pyrolysis gas collecting hole 19 is in communication with the exhaust gap; the exhaust gap is used for discharging the pyrolysis gas; The pyrolysis gas collecting hole 19 has a diameter of 0.6cm-1.4cm, preferably 1cm in the embodiment, and a spacing of 5cm.

[0034] In a further optimization, the spring door 4 comprises a metal door which is pivotally connected to the bottom of the discharge port 3, and a return spring is arranged between the metal door and the inner wall of the storage bin 5; when the product is collected to a certain amount, the door is opened under the action of gravity, and the product falls into the storage bin 5; when the product amount is small, the gravity is small, and the spring door 4 is closed. The spring door 4 is arranged to further cool the product in an oxygen-free environment, so that the product is not oxidized when it is at a high temperature.

[0035] In a further optimization, a screw conveyor device is arranged in the feeding port 14.

[0036] In a further optimization, the air inlet structure comprises a plurality of air inlets 23 which are arranged on the side wall of the inner cylinder 22 close to the flame gun 1. In a further optimization, the air inlets 23 are arranged at the right end of the inner cylinder 22, and in the embodiment, the number of air inlets 23 is 5-10, and the diameter of the air inlets 23 is 3cm-5cm.

[0037] The use method of the application is as follows: The Fenton sludge and other reducing substances (biochemical sludge, biomass materials, etc.) are dried and crushed (preferably with a particle size of less than 80 mesh), and then fall into the "lattice" formed by the auger blade 8 and the spacer 7 from the feeding port 14.

[0038] The motor 11 is energized to rotate, drive the rotating disc bearing 12 through the gear 10, and then drive the auger blade 8 to rotate, so that the sludge mixture moves to the right between the inner cylinder 22 and the outer cylinder 17, and rolls on the outer surface of the inner cylinder 22 for pyrolysis.

[0039] The spacer 7 is arranged between adjacent blades of the auger blade 8, so that the sludge is uniformly distributed on the outer surface of the inner cylinder 22.

[0040] Inside the device, it can be divided into preheating area, pyrolysis area and cooling area. The preheating area is located on the left side of the device, mainly heated by the flue gas generated by the combustion of the flame gun 1, without the regenerator 9, the sludge can be heated to a few hundred degrees Celsius in this area, further removing water and volatile substances. The pyrolysis area is located in the middle of the device, heated by the flame generated by the combustion of the flame gun 1, and the regenerator 9 is arranged in this area, which can make the temperature of the pyrolysis area more stable, and can also prolong the service life of the inner cylinder 22, so as to avoid being burned through too quickly. The cooling area, i.e. the area without heating, is located on the right side of the device. After high-temperature pyrolysis, the organic matter has been fully pyrolyzed, the trivalent iron has been fully reduced, and the material has been converted into a product (iron powder with high iron content), but the temperature is relatively high, and it needs to be cooled, otherwise it will burn when it meets air (zero-valent iron with very small particle size, which will burn when it contacts oxygen at high temperature). At this time, through the cooling area, the air supplied to the flame gun 1 (from the air inlet hole 23) passes through the inner cylinder 22 to indirectly cool the product and increase the temperature of the auxiliary material air, achieving the purpose of one stone two birds.

[0041] After the sludge is fed, the flame gun 1 is ignited, and a high-temperature flame is sprayed out, which can heat the regenerator 9 to the target temperature in a short time. The thermocouple 2 is arranged on the regenerator 9, and the temperature of the regenerator 9 is transmitted through the thermocouple 2 to adjust the firepower of the flame gun 1.

[0042] By adjusting the speed of the motor 11, the conveying speed of the sludge in the device is adjusted, and then the pyrolysis time is adjusted (the faster the conveying speed, the shorter the pyrolysis time, and vice versa). After the sludge pyrolysis is completed, the product is cooled and flows out from the discharge port 3, and then enters the product storage bin 5. A spring door 4 is arranged at the bottom of the discharge port 3, i.e. only when the product reaches a certain amount, the spring door 4 will be opened, allowing the product to fall into the product storage bin 5, which can further reduce the inflow of air into the cooling area of the device, and further cool the product.

[0043] The gas generated by the sludge in the preheating area, pyrolysis area and cooling area passes through the pyrolysis gas collection hole 19, then enters the pyrolysis gas collection pipe 18, then removes the tar and dust through the filtering equipment 15, and then is transported to the flame area of the flame gun 1 through the fan 16 for burning.

[0044] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the present application.

[0045] Obviously, the above embodiments of the present application are merely exemplary but not intended to limit the embodiments of the present application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, it is not necessary or possible to exhaust all the embodiments. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A Fenton sludge pyrolysis resource device, characterized in that, The application relates to a pyrolysis gas collection and conveying system. The pyrolysis gas collection and conveying system comprises a heat preservation assembly, a pyrolysis gas collection pipe (18) and a pyrolysis gas conveying pipe (21), the pyrolysis gas collection pipe (18) is fixedly connected with the outer wall of the outer cylinder (17) and communicates with the outer cylinder (17), one end of the pyrolysis gas conveying pipe (21) is fixedly connected with the pyrolysis gas collection pipe (18), the other end of the pyrolysis gas conveying pipe (21) extends into the inner cavity of the inner cylinder (22), a filtering device (15) and a fan (16) are arranged on the pyrolysis gas conveying pipe (21); the heat preservation assembly is arranged on the pyrolysis gas conveying pipe (21) and the outer cylinder (17). The auger conveying assembly comprises a turntable bearing (12) and an auger blade (8). The turntable bearing (12) is arranged on the outer wall of the inner cylinder (22); one side of the outer wall of the turntable bearing (12) is provided with a gear ring. The auger blade (8) is arranged on the turntable bearing (12) through a fixing component (20); the auger blade (8) is located in the outer cylinder (17), and the spacer structure is arranged on the auger blade (8). 2.The Fenton sludge pyrolysis resource device according to claim 1, characterized in that: The motor (11) is arranged on the outer wall of the outer cylinder (17), the output shaft of the motor (11) is provided with a gear (10), and the gear (10) is in meshing transmission with the gear ring. The spacer structure comprises a plurality of spacers (7), the spacers (7) are arranged between adjacent two auger blades (8), the spacers (7) are arranged at equal intervals in the circumferential direction of the turntable bearing (12), and a gap is formed in the spacer (7). The feeding assembly comprises a feeding port (14), and the feeding port (14) is arranged on the top surface of the outer cylinder (17). The discharging assembly comprises a discharging port (3), the discharging port (3) is arranged on the bottom surface of the outer cylinder (17), and the feeding port (14) and the discharging port (3) are arranged on the two sides of the outer cylinder (17) respectively. 3.The Fenton sludge pyrolysis resource device according to claim 2, characterized in that: The bottom of the discharging port (3) is provided with a storage bin (5), and a spring door (4) is arranged between the discharging port (3) and the storage bin (5).

4. The Fenton sludge pyrolysis resource recovery device according to claim 1, characterized in that: The heat preservation assembly comprises a thermocouple (2) and a heat storage body (9), the heat storage body (9) is arranged on the inner wall of the inner cylinder (22), the detection end of the thermocouple (2) extends into the heat storage body (9), and the heat storage body (9) is a ceramic heat storage body. ​ ​ 5. The Fenton sludge pyrolysis resource recovery device according to claim 1, characterized in that: ​ 6.The Fenton sludge pyrolysis resource device according to claim 1, characterized in that: The heat preservation assembly comprises a heat preservation layer (6) and a shell (13), the heat preservation layer (6) is sleeved outside the pyrolysis gas conveying pipe (21) and the outer cylinder (17), the shell (13) is sleeved outside the heat preservation layer (6), and the heat preservation layer (6) is made of any one or several of ceramic fiber, rock wool and aluminum silicate heat preservation cotton material.

7. The Fenton sludge pyrolysis resource recovery device according to claim 1, characterized in that: Two groups of collecting hole groups are formed on the pyrolysis gas collecting pipe (18), each collecting hole group comprises a plurality of pyrolysis gas collecting holes (19) arranged at equal intervals, the pyrolysis gas collecting holes (19) of the two groups of collecting hole groups are arranged alternately, an exhaust gap is formed on the top of the outer wall of the outer cylinder (17), and the pyrolysis gas collecting holes (19) are communicated with the exhaust gap. 8.The Fenton sludge pyrolysis resource device according to claim 4, characterized in that: The spring door (4) comprises a metal door, the metal door is rotationally connected to the bottom of the discharge port (3) through a rotating shaft, and a reset spring is arranged between the metal door and the inner wall of the storage bin (5). 9.The Fenton sludge pyrolysis resource device according to claim 4, characterized in that: The feeding port (14) is provided with a screw conveyor.

10. The Fenton sludge pyrolysis resource recovery device according to claim 1, characterized in that: The air inlet structure comprises a plurality of air inlets (23), and the air inlets (23) are arranged at intervals on the side wall of the inner cylinder (22) close to the flame gun (1).

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