CN113443804A

CN113443804A - Combined complete equipment for resource utilization of microwave high-temperature anaerobic pyrolysis sludge

Info

Publication number: CN113443804A
Application number: CN202110897940.5A
Authority: CN
Inventors: 张少华; 刘乔兵
Original assignee: Chengdu Fuhua Environmental Protection Technology Co ltd
Current assignee: Chengdu Fuhua Environmental Protection Technology Co ltd
Priority date: 2021-08-05
Filing date: 2021-08-05
Publication date: 2021-09-28

Abstract

The invention relates to combined type microwave high-temperature anaerobic pyrolysis sludge resource utilization complete equipment which comprises a spiral input cylinder, an air removal bin, a spiral conveying cylinder and a pyrolysis gas cooler, wherein the spiral input cylinder, the air removal bin, the spiral conveying cylinder and the pyrolysis gas cooler are sequentially connected; the spiral conveying cylinder is connected with a sludge input metering hopper and a microwave energy absorber input metering hopper; the upper wall of the front section of the spiral conveying cylinder is connected with a pyrolysis gas cooler, and the lower part of the tail part of the rear section of the spiral conveying cylinder is connected with a residue cooler; the sludge in the spiral conveying cylinder is decomposed into gas phase and solid phase, the gas phase is pumped into the pyrolysis gas cooler, and the solid phase is introduced into the residue cooler. The invention achieves the following beneficial effects: can continuously pyrolyze, has high treatment effect, fully discharges gas phase and has good pyrolysis effect.

Description

Combined complete equipment for resource utilization of microwave high-temperature anaerobic pyrolysis sludge

Technical Field

The invention relates to the technical field of sludge treatment, in particular to a complete set of equipment for resource utilization of sludge through combined microwave high-temperature anaerobic pyrolysis.

Background

The continuous increase of sewage treatment capacity leads to the remarkable worldwide increase of sludge yield and brings about increasingly serious environmental pollution problems.

The most common methods for treating sewage sludge are composting, farm land use, and incineration, but without exception have their own drawbacks. The volume reduction is not realized in the composting treatment process, and the occupied area of the treatment, storage and buffer areas is large; to prevent contamination by harmful contaminants, the soil is isolated; this treatment wastes a large amount of energy contained in the sludge itself. The sludge composting treatment has high operating cost, is not suitable for large-scale treatment projects, and has no example of successful operation of the large-scale treatment projects. Excessive use of farmland utilization results in increased heavy metal content in farmland soil and contamination of surface and ground water by pathogens, refractory organics and loss of N, P. The incineration method can greatly reduce the volume of the sludge and improve the utilization rate of heat energy by utilizing the energy in the sludge; however, the incineration method has large investment in treatment facilities and high treatment cost, and the incineration of organic matters can generate highly toxic substances such as dioxin and the like, so that the prevention and treatment cost is high.

Pyrolysis has been the focus of research because it has the advantages of the above-mentioned methods. In the process of sludge thermal decomposition, the volume of sewage and sludge is greatly reduced, and the resistance of heavy metals in existing carbon bases to natural precipitation is quite strong and is less than the precipitation of heavy metals in incineration ash. In addition, the process is carried out under anaerobic condition, and harmful substances are rarely generated; the pyrolysis reaction is controlled under a certain condition, and the residual solid matters can be used as an adsorbent for adsorbing pollutants in the air and odor generated in the sewage treatment process; more importantly, the pyrolysis of the sewage sludge can generate oil products and gas which have high heat value and can be used as fuel, so that the sludge pyrolysis becomes a means for recycling the sludge, accords with the mainstream of disposing waste at present and is paid much attention.

The sludge pyrolysis method comprises a low-temperature pyrolysis method, a high-temperature pyrolysis method and a direct thermochemical liquefaction method. The low-temperature pyrolysis equipment is relatively simple, the energy recovery rate is high, the possibility of secondary pollution to the environment is low, the investment is equivalent to or slightly lower than that of the incineration technology, and the operation cost is only about 30% of that of the incineration method. The method has the disadvantages that the sludge adopted by low-temperature pyrolysis needs to be dried and dehydrated, the water content is below 5 percent, the energy consumption is high, and the net residual energy is not very high; the produced oil contains a large amount of polycyclic aromatic hydrocarbon substances, and the environment is adversely affected. Although the sludge pyrolysis has many advantages, most of oil products generated by the sludge pyrolysis by using the traditional electric furnace are polycyclic aromatic hydrocarbons with the content of 80%, and the oil products are limited in use because many substances in the polycyclic aromatic hydrocarbons can cause carcinogenesis and cause mutation. The sludge with the water content of 70-80% which is subjected to mechanical dehydration is directly liquefied, energy consumed by drying is avoided, the energy surplus rate is high, the requirement on equipment is high, a large amount of harmful gas is generated in the pyrolysis process, the application of the technology is limited, 2-3% of N2 residue exists in a product, oxynitride is produced in the combustion process, the atmosphere is easily polluted, and corresponding measures are required to be taken for control.

Compare with traditional heating methods, microwave heating heat is from the inside production of material, need not transmit inside from the surface, and the heating is even, and heat time is short, only needs traditional time of heating 1/100~1/10 can accomplish, and the thermal efficiency is high, and the microwave has selectivity and penetrability. By adding microwave energy absorbing substances into the sludge, the sludge is quickly raised to a high temperature of more than 900 ℃ in a microwave field, and the high-temperature pyrolysis of the sludge is realized.

The microwave high-temperature anaerobic pyrolysis experiment of the sludge shows that: the heat value of the liquid product can reach more than 37MJ/kg, is equivalent to that of diesel oil, is 2-7 MJ/kg higher than that of the traditional high-temperature oxygen-free pyrolysis oil, and is more suitable for being used as fuel; the content of Polycyclic Aromatic Hydrocarbons (PAHs) in the oil is lower than 5.37 percent, and the oil is nontoxic PAHs; the volume fraction of H2 and CO in the gaseous product is more than 54%, and the calorific value reaches 9420kJ/m3, so that the gaseous product can be used as fuel.

The sludge microwave high-temperature anaerobic pyrolysis technology is more and more emphasized by environment workers, a lot of research works are carried out, and the feasibility of the technology is determined. However, the tunnel continuous microwave high-temperature oven in the current market mostly adopts the following structures:

1. a cart type: a track is arranged in the equipment, a plurality of continuous tool trucks are arranged on the track, and the tool trucks in front of the top of the rear tool truck are driven by hydraulic pressure to finish feeding, so that the equipment is particularly suitable for conveying lump materials; the defects are that the working process is indirect and continuous and is not suitable for powder treatment.

2. Push plate (push boat) type: the bottom of the equipment cavity is provided with a channel, materials are placed on the push plate, and the rear push plate pushes the front push plate through transmission, so that feeding is finished; although the push plate can be embodied in a crucible form so as to realize powder treatment, the defects are that the working process is indirect and continuous, and if the equipment is too long, the friction force is increased, and the push plate is easy to topple over to cause the phenomenon of kiln blockage.

3. A roller way type: the plurality of metal rollers drive the material to move forward under the uniform transmission of the chains, so that the material is more suitable for treating the lump material; but the defects are that the roller bed easily influences the microwave effect and can not continuously convey the powder.

The above structures can not smoothly complete the continuous and uninterrupted conveying of materials, and are especially not suitable for the conveying of powder materials. The invention relates to a tunnel continuous microwave high-temperature heating furnace (No. CN 201852437U), which improves the defects, adopts chain ceramic laminated plates to convey materials, and is difficult to ensure in the implementation process although the design considers that a flat and compact conveying plane is formed. The microwave can penetrate through the ceramic plate and then act on the metal conveying chain, and the influence of the metal on the microwave cannot be avoided.

The invention adopts a specially designed screw conveying device to realize continuous, uninterrupted, stable and leakage-free conveying of materials, is suitable for blocky and powdery materials with particles not larger than a conveying screw pitch, heats a middle-section microwave resonant cavity, preheats the materials by front-section high-temperature gas, continuously pyrolyzes the rear-section high-temperature materials, and is provided with the addition of microwave energy absorption substances, a nitrogen oxygen-isolated environment, cooling separation of oil and gas and cooling collection of residues aiming at the high-temperature pyrolysis condition of sewage sludge to form the microwave high-temperature oxygen-free pyrolysis continuous treatment device of the sewage sludge.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide the combined type microwave high-temperature anaerobic pyrolysis complete equipment for sludge resource utilization, which can carry out continuous pyrolysis, has high treatment effect, can fully discharge gas phase and has good pyrolysis effect.

The purpose of the invention is realized by the following technical scheme: the combined type complete equipment for resource utilization of the microwave high-temperature anaerobic pyrolysis sludge comprises a spiral input cylinder, an air removal bin, a spiral conveying cylinder and a pyrolysis gas cooler which are sequentially connected;

the spiral conveying cylinder is connected with a sludge input metering hopper and a microwave energy absorber input metering hopper;

the upper wall of the front section of the spiral conveying cylinder is connected with a pyrolysis gas cooler, and the lower part of the tail part of the rear section of the spiral conveying cylinder is connected with a residue cooler;

the sludge in the spiral conveying cylinder is decomposed into gas phase and solid phase, the gas phase is pumped into the pyrolysis gas cooler, and the solid phase is introduced into the residue cooler.

Furthermore, a high-temperature-resistant alloy conveying shaft is arranged in the spiral conveying cylinder, and a high-temperature-resistant silicon carbide wave-absorbing layer is sprayed on the surface of the shaft section of the microwave heating resonant cavity corresponding to the shaft section of the shaft;

the shell section of the shell corresponding to the microwave heating resonant cavity is a high-transparency quartz glass cylinder, the front section and the rear section of the shell are high-temperature-resistant alloy cylinders, and two ends of the shell are sealed by air sealing heads.

Furthermore, the microwave slot array waveguide is four symmetrically arranged rectangular narrow-edge slotted waveguides, each rectangular narrow-edge slotted waveguide is separately connected with an input head, and microwave energy generated by the rectangular narrow-edge slotted waveguide is coupled into the microwave heating resonant cavity through the narrow slot array.

The device further comprises a nitrogen supply bottle, and the nitrogen supply bottle is respectively connected with the air removal bin and the residue cooler through air pipes; the spiral input cylinder and the spiral conveying cylinder are horizontally arranged, and the air removal bin and the residue cooler are vertically arranged; the nitrogen supply bottle is used for introducing nitrogen from the bottoms of the air removal bin and the residue cooler; the nitrogen introduced from the bottom of the residue cooler sequentially passes through the residue cooler, the rear section of the spiral conveying cylinder, the middle section of the spiral conveying cylinder and the front section of the spiral conveying cylinder to form a route for discharging the gas phase after pyrolysis.

Further, the pyrolysis gas cooler is a shell-and-tube heat exchanger which is vertically arranged and comprises a shell side and a tube side; the gas phase after pyrolysis is pumped to a shell pass for cooling, and a combustible gas and oil-water mixture is formed after cooling; the combustible gas is pumped from the upper part of the pyrolysis cooler to a combustible gas storage tank by a fan; and oil-water mixture is discharged from the bottom of the pyrolysis cooler.

Furthermore, a cooling pipe structure is arranged in the residue cooler; the cooling pipe structure comprises a lower annular water inlet pipe, an upper annular water outlet pipe and cooling pipes, wherein the lower annular water inlet pipe and the upper annular water outlet pipe are communicated by the plurality of cooling pipes arranged at intervals;

the cooling pipes are spiral pipes and are arranged in the vertical direction, and the central lines of the cooling pipes are distributed along the annular circumference of the lower annular water inlet pipe.

Furthermore, a cutting guide piece is also arranged on the shaft section corresponding to the microwave heating resonant cavity of the high-temperature-resistant alloy conveying shaft in the spiral conveying cylinder; the cutting guide piece is formed in a cross shape by a flat vertical part and a flat horizontal part, the horizontal plane of the flat horizontal part is parallel to the axis of the high-temperature-resistant alloy conveying shaft, and the flat plane of the flat vertical part is perpendicular to the axis of the high-temperature-resistant alloy conveying shaft, so that a structure for cutting sludge and leading out a pyrolyzed gas phase is formed. So that the decomposed gas phase can be effectively dissipated.

Further, a stirring mechanism is arranged in the air removal bin; the stirring mechanism comprises a plurality of stirring units driven by a driving motor, each stirring unit comprises a transverse rod and a vertical rod, the transverse rods are fixed on an output shaft of the driving motor, and the vertical rods are fixed on the transverse rods at intervals to form a structure for stirring sludge at a low speed. For some of the dried material, water was allowed to mix into each portion to facilitate subsequent microwave heating.

The invention has the following advantages:

(1) the continuous pyrolysis of the sludge is realized by arranging the spiral conveying cylinder, the air removing bin, the material spiral conveying cylinder and the residue cooler in a connected manner, and the material spiral conveying cylinder is also connected with the heat-clearing air cooler, so that the gas-phase and solid-phase residues are continuously separated, the sludge can be continuously treated without stopping, and the sludge treatment efficiency is improved; the whole processing flow does not need manual participation, and the automation degree is high;

(2) the arrangement of the structure in the scheme ensures that the route of the nitrogen for discharging air and gas phase is simple, and the nitrogen uniformly flows to the sludge inlet from the tail end of the residue, so that the gas phase discharging effect is good;

(3) the stirring mechanism in the air removal bin is used for stirring the sludge to a certain degree, and for the sludge which is relatively dry, some water can be stirred to a dry part, so that the subsequent microwave heating is facilitated, and the pyrolysis effect is improved; for wet sludge, the air in the sludge can be better discharged; the arrangement of the dividing guide piece in the material spiral conveying cylinder enables the gas phase generated after pyrolysis to be fully discharged from sludge, and the gas phase discharge effect is improved;

(4) the structure of the residue cooler can fully cool the solid-phase residue;

(5) a high-temperature-resistant silicon carbide wave-absorbing layer is coated on the middle section of a high-temperature-resistant alloy conveying shaft in the material spiral conveying cylinder, so that microwaves can be better absorbed, and the pyrolysis effect is improved; microwave energy absorbers are input into the metering hopper, and the introduction of the microwave energy absorbers can further promote the absorption of microwaves and improve the pyrolysis effect;

(6) on the high temperature resistant alloy delivery shaft in the material screw conveyer section of thick bamboo, the setting of the protruding dish in both ends plays a barrier effect to mud, avoids mud to get into sealed department.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view;

FIG. 3 is a schematic structural view of a displacement block including a horizontal portion B and a vertical portion B;

FIG. 4 is a schematic structural view of the present invention;

FIG. 5 is a schematic structural view of the present invention;

FIG. 6 is a schematic structural view of the present invention;

in the figure: 1-sludge input metering hopper, 2-microwave energy absorber input metering hopper, 3-air removal bin, 4-nitrogen gas supply bottle, 5-air inlet valve A, 6-feed valve, 7-material screw conveying cylinder, 8-high temperature resistant self-lubricating bearing, 9-air sealing head, 10-fan, 11-microwave slit array waveguide, 12-microwave heating resonant cavity, 13-antipyretic gas cooler, 14-residue cooler, 15-air inlet valve B, 16-slag discharge valve, 17-screw input cylinder, 18-segmentation guide piece and 19-stirring unit.

Detailed Description

The invention will be further described with reference to the accompanying drawings, but the scope of the invention is not limited to the following.

As shown in fig. 1 to 6, the combined microwave high-temperature anaerobic pyrolysis sludge resource utilization complete equipment comprises a spiral input cylinder 17, an air removal bin 3, a spiral conveying cylinder 7 and a residue cooler 14 which are sequentially connected.

Specifically, a spiral input cylinder 17 is provided, and the tail end thereof extends into the upper part of the air removal bin 3; the air removal bin 3 is vertically arranged, and the lower part of the air removal bin is communicated with the front end of the front section of the spiral conveying cylinder 17 through a feed valve 6; the screw conveying cylinder 17 is horizontally arranged, and a residue cooler 14 is arranged below the tail end of the rear section of the screw conveying cylinder; the residue cooler 14 is disposed vertically and is connected at the bottom thereof to a slag discharge valve 16. The sludge to be treated enters the air removal bin 3 from the spiral input cylinder 17, the air in the sludge is discharged, then the spiral conveying cylinder 7 is pyrolyzed, finally the sludge is cooled in the residue cooler 14 and finally the sludge is discharged.

The middle section of the spiral conveying cylinder 17 is sleeved with a microwave crack array waveguide 11 and a microwave heating resonant cavity 12.

The bottom of the air removal chamber 3 is connected to the nitrogen gas supply bottle 4 through a pipe, and an air inlet valve a5 is provided on the connected pipe. The air in the sludge is discharged by nitrogen.

For the air removal bin 3, as shown in fig. 6: the inside rabbling mechanism that is provided with, rabbling mechanism include a plurality of stirring unit 19, driving motor, and in driving motor's output shaft stretched into air and got rid of storehouse 3, be provided with a plurality of stirring unit 19 along the upper and lower direction on the output shaft. The stirring unit 19 comprises a cross rod and a vertical rod, the cross rod is circumferentially fixed on the output shaft, and the cross rod is provided with a plurality of vertical rods at intervals. The stirring mechanism stirs slowly because the purpose is not to drop the sludge thoroughly and evenly.

The reason for providing the stirring mechanism is: because the sludge is pyrolyzed by microwaves, the heating effect in the microwave pyrolysis is according to the moisture, namely, the heating is fast in places with high moisture, the heating is slow when the moisture is less, and the pyrolysis is not sufficient; the arrangement of the stirring structure is that the part with less water in the sludge can be distributed with more water under the stirring effect. When microwave pyrolysis is carried out, the temperature can be rapidly increased to reach high temperature, so that full pyrolysis is realized. Especially for some relatively dry sludge, the effect is better; if the sludge is indeed too dry, some water may be optionally added to the air removal tank.

Of course, the stirring mechanism also has the function of completely releasing the air in the relatively humid sludge and improving the air removal effect.

The spiral conveying cylinder 17 comprises an external cylinder shell, and a high-temperature-resistant alloy conveying shaft is arranged in the cylinder shell. The upper wall of the front section of the cylinder shell is communicated with a pyrolysis gas cooler 13 between the joint of the air removal bin 3 and the arrangement of the microwave heating resonant cavity 12. The lower portion of the residue cooler 14 is also connected to the nitrogen gas supply cylinder 4 via a pipe, and the connected pipe is provided with an intake valve B15. The spiral conveying cylinder 17 can form gas phase and solid phase during microwave pyrolysis, and the solid phase is residue and is discharged through the residue cooler 14; when nitrogen enters from the lower part of the residue cooler 14 and flows through the residue cooler 14, the nitrogen flows through the rear section, the middle section and the front section of the spiral conveying cylinder 17 in sequence, and the gas phase after pyrolysis is discharged into the pyrolysis gas cooler 13.

Specifically, in the screw conveying cylinder 17, the cylinder shell is divided into a front section, a middle section and a rear section, and the high-temperature-resistant alloy conveying shaft is also divided into a front section, a middle section and a rear section, and the cylinder shell, the front section, the middle section and the rear section of the high-temperature-resistant alloy conveying shaft correspond to each other one by one. The middle section corresponds to the pyrolysis position, namely the microwave crack array waveguide 11 and the microwave heating resonant cavity 12 are arranged at the middle section of the cylinder shell. The front section and the rear section of the cylinder shell are high-temperature-resistant alloy cylinders, the middle section of the cylinder shell is a high-transparency quartz glass cylinder, and the quartz glass cylinder is in butt joint with the high-temperature-resistant alloy cylinders; the cartridge housing is closed at both ends by air sealing heads 9. The middle section spraying of high temperature resistant alloy delivery shaft has high temperature resistant carborundum to inhale the wave layer, is convenient for absorb the microwave to play the effect of auxiliary heating.

The two ends of the high-temperature-resistant alloy conveying shaft are provided with protruding disc shapes, the air sealing head 9 is installed on the protruding discs in a sealed mode, and when sludge is conveyed, the sludge is blocked by the protruding discs and is prevented from entering bearing sealing positions. The high-temperature-resistant alloy conveying shaft is connected with a corresponding conveying motor in a driving way after passing through the high-temperature-resistant self-lubricating bearing 8.

In addition, when the sludge is conveyed in the spiral conveying cylinder 17, the sludge essentially moves along the grooves of the spiral flood dragon blades under the action of the spiral flood dragon blades. When pyrolysis is carried out, the gas phase in the sludge cannot be discharged sufficiently and timely, and the gas phase cannot be recycled sufficiently. For this purpose, as shown in fig. 4 and 5, a split guide 18 is further provided in the middle section of the high-temperature-resistant alloy conveying shaft in the spiral conveying cylinder 7, and the split guide 18 is cross-shaped and includes a flat vertical portion and a flat horizontal portion, the horizontal plane of the flat horizontal portion is parallel to the axis of the high-temperature-resistant alloy conveying shaft, and the flat plane of the flat vertical portion is perpendicular to the axis of the high-temperature-resistant alloy conveying shaft. When the sludge moves in the grooves between the flood dragon blades, the sludge is cut by the flat vertical part and the flat horizontal part; cutting the flat vertical part to discharge the gas phase at the bottom; and the cutting of the flat horizontal part can ensure that the gas phase of the sludge block in the left and right directions enters the cutting space after the cutting of the vertical part, thereby discharging the gas phase again. Achieving good gas phase discharge effect.

For the pyrolysis gas cooler 13, as shown in fig. 2: the vertical setting is a shell-and-tube heat exchanger, including shell pass and tube pass. And pumping the pyrolyzed gas phase to a shell side for cooling, and forming a combustible gas and oil-water mixture after cooling. The combustible gas is pumped from the upper part of the pyrolysis cooler 13 to a combustible gas storage tank through a fan 10; and the oil-water mixture is discharged from the bottom of the pyrolysis cooler 13.

For the residue cooler 14, as shown in FIG. 3: and a cooling pipe structure is arranged in the cooling pipe; the cooling pipe structure comprises a lower annular water inlet pipe, an upper annular water outlet pipe and cooling pipes, wherein the lower annular water inlet pipe and the upper annular water outlet pipe are communicated by the plurality of cooling pipes arranged at intervals; and the cooling pipes are spiral pipes and are arranged along the up-down direction, and the central lines of the cooling pipes are distributed along the annular circumference of the lower annular water inlet pipe.

A slag temperature monitor (temperature sensor) is also provided in the residue cooler 1.

In this embodiment, a sludge input measuring hopper 1 and a microwave energy absorbing material input measuring hopper 2 are provided on the screw input cylinder 17. The sludge input metering hopper 1 adopts a variable speed motor to drive a screw shaft, and the sludge input quantity is in direct proportion to the rotating speed; the microwave energy absorber input measuring hopper 2 is used for measuring and adding the microwave energy absorber according to the sludge input amount according to the set microwave energy absorber adding proportion, and the microwave energy absorber and the sludge are mixed in the spiral conveying process.

In this embodiment, the microwave slot array waveguide 11 is four symmetrically arranged rectangular narrow-edge slotted waveguides, each rectangular narrow-edge slotted waveguide is separately connected with an input head, and the microwave energy generated by the rectangular narrow-edge slotted waveguide is coupled into the microwave heating resonant cavity through the narrow-slot array.

In this embodiment, among the rabbling mechanism in storehouse 3 is got rid of to the air, driving motor fixes on the mounting bracket, and driving motor's output shaft stretches into behind a plurality of mounting brackets and the bearing in storehouse 3 is got rid of to the air, guarantees driving motor output shaft pivoted stability.

In the embodiment, the air isolation seals 9 are arranged at two ends of the cylinder shell of the material screw conveying device 7, an end face sealing mode is adopted, and high-temperature-resistant and wear-resistant silicon carbide is sprayed on a sealing face to prevent air from entering.

When in work:

the method comprises the following steps: lifting sewage sludge with the water content of about 80% to a sludge input metering hopper 1 through a grab bucket, adding a microwave energy absorber into the sludge input metering hopper 2, closing a feed valve 6 and a slag discharge valve 16, closing an oil-water separator inlet valve (not shown), opening an emptying valve (not shown) of a gas storage tank, opening a main switch of a nitrogen gas supply bottle 4, opening an air inlet valve A5 and an air inlet valve B15, opening a fan 10, and replacing air in the device;

step two: starting the switch valve of the sludge input measuring hopper 1, delaying to open the switch valve of the microwave energy absorber input measuring hopper 2, adjusting the opening degree of an air inlet valve A5, controlling the pressure in the air removing bin 3 to be micro-positive pressure, preferably 5kPa, and closing an air inlet valve B15.

Step three: when the material level in the air removal bin 3 reaches 2/3, opening the feed valve 6, starting the conveying motor of the material spiral conveying cylinder 7, delaying the starting of the microwave generating device, controlling the microwave input power through the material temperature, and controlling the sludge treatment capacity through the motor rotating speed of the material spiral conveying cylinder 7;

step four: and when the material spiral conveying cylinder 7 is started, the cooling water of the pyrolysis gas cooler 13 is started, and the cooling water of the residue cooler 14 is started.

The above examples only represent preferred embodiments, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.

Claims

1. Combined type microwave high-temperature anaerobic pyrolysis sludge resource utilization complete equipment is characterized in that:

comprises a spiral input cylinder (17), an air removal bin (3), a spiral conveying cylinder (7) and a pyrolysis gas cooler (13) which are connected in sequence;

the spiral conveying cylinder (7) is connected with a sludge input metering hopper (1) and a microwave energy absorber input metering hopper (2);

the middle section of the spiral conveying cylinder (7) is sleeved with a microwave crack array waveguide (11) and a microwave heating resonant cavity (12), the upper wall of the front section of the spiral conveying cylinder is connected with a pyrolysis gas cooler (13), and the lower part of the tail part of the rear section of the spiral conveying cylinder is connected with a residue cooler (14);

the sludge in the spiral conveying cylinder (7) is decomposed into gas phase and solid phase, the gas phase is pumped into the pyrolysis gas cooler (13), and the solid phase is introduced into the residue cooler (14).

2. The combined type microwave high-temperature oxygen-free pyrolysis sludge resource utilization complete equipment as claimed in claim 1, which is characterized in that: the spiral conveying cylinder (7) is internally provided with a high-temperature-resistant alloy conveying shaft, and a high-temperature-resistant silicon carbide wave-absorbing layer is sprayed on the surface of the shaft section of the microwave heating resonant cavity (12) corresponding to the shaft section of the shaft;

the shell section of the shell of the spiral conveying cylinder (7) corresponding to the microwave heating resonant cavity (12) is a high-transparency quartz glass cylinder, the front section and the rear section of the shell are high-temperature-resistant alloy cylinders, and two ends of the shell are sealed by air sealing heads (9).

3. The combined type microwave high-temperature oxygen-free pyrolysis sludge resource utilization complete equipment as claimed in claim 2, which is characterized in that: the microwave slot array waveguide (11) is four symmetrically arranged rectangular narrow-edge slotted waveguides, each rectangular narrow-edge slotted waveguide is separately connected with an input head, and microwave energy generated by the rectangular narrow-edge slotted waveguide is coupled into the microwave heating resonant cavity (12) through a narrow-slot array.

4. The combined type microwave high-temperature oxygen-free pyrolysis sludge resource utilization complete equipment as claimed in claim 3, is characterized in that: the device also comprises a nitrogen supply bottle (4), wherein the nitrogen supply bottle (4) is respectively connected with the air removal bin (3) and the residue cooler (14) through air pipes;

the spiral input cylinder (17) and the spiral conveying cylinder (7) are horizontally arranged, and the air removal bin (3) and the residue cooler (14) are vertically arranged;

the nitrogen gas supply bottle (4) is filled with nitrogen gas from the bottoms of the air removal bin (3) and the residue cooler (14);

the nitrogen introduced from the bottom of the residue cooler (14) sequentially passes through the residue cooler (14), the rear section of the spiral conveying cylinder (7), the middle section of the spiral conveying cylinder (7) and the front section of the spiral conveying cylinder (7), and a route for discharging a gas phase after pyrolysis is formed.

5. The combined type microwave high-temperature oxygen-free pyrolysis sludge resource utilization complete equipment as claimed in claim 3, is characterized in that: the pyrolysis gas cooler (13) is a shell-and-tube heat exchanger which is vertically arranged and comprises a shell side and a tube side;

the gas phase after pyrolysis is pumped to a shell pass for cooling, and a combustible gas and oil-water mixture is formed after cooling;

combustible gas is pumped from the upper part of the pyrolysis cooler (13) to a combustible gas storage tank through a fan (10);

and the oil-water mixture is discharged from the bottom of the pyrolysis cooler (13).

6. The combined type microwave high-temperature oxygen-free pyrolysis sludge resource utilization complete equipment as claimed in claim 4 or 5, is characterized in that: a cooling pipe structure is arranged in the residue cooler (14);

the cooling pipe structure comprises a lower annular water inlet pipe, an upper annular water outlet pipe and cooling pipes, wherein the lower annular water inlet pipe and the upper annular water outlet pipe are communicated by the plurality of cooling pipes arranged at intervals;

7. The combined type microwave high-temperature oxygen-free pyrolysis sludge resource utilization complete equipment as claimed in claim 6, is characterized in that: a cutting guide piece (18) is also arranged on the shaft section corresponding to the microwave heating resonant cavity (12) of the high-temperature-resistant alloy conveying shaft in the spiral conveying cylinder (7);

the cutting guide piece (18) is formed in a cross shape by a flat vertical part and a flat horizontal part, the stool plane of the flat horizontal part is parallel to the axis of the high-temperature-resistant alloy conveying shaft, and the flat plane of the flat vertical part is perpendicular to the axis of the high-temperature-resistant alloy conveying shaft, so that a structure for cutting sludge and leading out a pyrolyzed gas phase is formed.

8. The combined type microwave high-temperature oxygen-free pyrolysis sludge resource utilization complete equipment as claimed in claim 7, is characterized in that: a stirring mechanism is arranged in the air removing bin (3);

the stirring mechanism comprises a plurality of stirring units (19) driven by a driving motor, each stirring unit (19) comprises a transverse rod and a vertical rod, the transverse rods are fixed on an output shaft of the driving motor, and the vertical rods are fixed on the transverse rods at intervals to form a structure for stirring sludge at a low speed.