CN109665688B - Treatment method of oily sludge - Google Patents
Treatment method of oily sludge Download PDFInfo
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- CN109665688B CN109665688B CN201910105875.0A CN201910105875A CN109665688B CN 109665688 B CN109665688 B CN 109665688B CN 201910105875 A CN201910105875 A CN 201910105875A CN 109665688 B CN109665688 B CN 109665688B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/40—Valorisation of by-products of wastewater, sewage or sludge processing
Abstract
The invention discloses a treatment method of oily sludge, which relates to the technical field of garbage treatment and comprises the following steps: controlling the first pushing device to close the feeding bin door; after the materials are fed and deoxidized, a first pushing device is controlled to open a feeding bin gate, and the materials after being deoxidized are conveyed to a main microwave pyrolysis furnace through a material conveying belt; controlling a third pushing device to close a main furnace door of the main microwave pyrolysis furnace; carrying out temperature control circulating pyrolysis treatment in the main microwave pyrolysis furnace, and conveying the materials subjected to the temperature control circulating pyrolysis treatment to the auxiliary microwave pyrolysis furnace through a material conveying belt; and carrying out secondary pyrolysis treatment in the auxiliary microwave pyrolysis furnace, and conveying residues after the secondary pyrolysis treatment to a discharging device through a material conveying belt. The microwave pyrolysis furnace has the advantages of uniform material temperature rise pyrolysis and high pyrolysis efficiency in the microwave pyrolysis furnace.
Description
Technical Field
The invention relates to the technical field of garbage treatment, in particular to a method for treating oily sludge.
Background
The oily sludge mainly comes from the industries of petroleum exploitation, refining and petrochemical industry, and along with the increase of petroleum yield, the total amount of the produced oily sludge is continuously increased, so that the pollution to the environment is gradually serious. Therefore, from the viewpoint of environmental protection, normal production maintenance, and energy recovery, it is necessary to perform harmless and recycling treatment on the oily sludge.
At present, the harmless treatment of the oily sludge is mainly as follows: the oily sludge is heated by microwave under anaerobic condition and treated by thermal cracking technology, thus improving the recovery rate of oil-gas resources in the oily sludge, reducing environmental pollution and improving economic benefit.
For example, an existing oily sludge treatment system mainly includes a vertical microwave pyrolysis furnace, in which a rotating cone is disposed at the center of a housing, and the rotating cone is connected with a power mechanism for driving the rotating cone to rotate. When the device works, the rotating cone drives materials in the furnace to rotate, newly-entered oily sludge is uniformly distributed on the topmost part of the materials in the furnace, the temperature is gradually increased and the sludge is dried under the action of microwave energy, and finally the temperature required by heavy oil cracking is reached, so that cracking separation is realized. However, materials are easy to accumulate in the vertical rotary microwave cracking furnace, and the defects of nonuniform temperature rise and pyrolysis, insufficient pyrolysis and low pyrolysis efficiency exist.
Disclosure of Invention
Therefore, the technical problems to be solved by the embodiment of the invention are that the oily sludge treatment method in the prior art has uneven material temperature rise pyrolysis and low pyrolysis efficiency in a microwave cracking furnace.
Therefore, the method for treating the oily sludge comprises the following steps:
controlling the first pushing device to close the feeding bin door;
after the materials are fed and deoxidized, a first pushing device is controlled to open a feeding bin gate, and the materials after being deoxidized are conveyed to a main microwave pyrolysis furnace through a material conveying belt;
controlling a third pushing device to close a main furnace door of the main microwave pyrolysis furnace;
carrying out temperature control circulating pyrolysis treatment in the main microwave pyrolysis furnace, and conveying the materials subjected to the temperature control circulating pyrolysis treatment to the auxiliary microwave pyrolysis furnace through a material conveying belt;
and carrying out secondary pyrolysis treatment in the auxiliary microwave pyrolysis furnace, and conveying residues after the secondary pyrolysis treatment to a discharging device through a material conveying belt.
Preferably, the step of feeding and deoxygenating the material comprises:
after the materials are put into the feeding bin, the feeding deoxygenation bin and the feeding bin, introducing replacement gas from a gas inlet;
detecting the oxygen content of the output gas from the gas outlet;
judging whether the oxygen content is less than or equal to an oxygen content preset value;
and when the oxygen content is less than or equal to the preset oxygen content value, obtaining the result of finishing the deoxidation treatment.
Preferably, the step of performing temperature-controlled cyclic pyrolysis treatment in the main microwave pyrolysis furnace comprises:
a microwave breach in the main microwave pyrolysis furnace outputs first power microwaves to heat the material;
the temperature detection device detects the temperature value of the material;
judging whether the temperature value is greater than or equal to a preset temperature value or not;
and when the temperature value is greater than or equal to the preset temperature value, controlling the second pushing device to lift the spiral conveying device, so that the materials are directly conveyed along the material conveying belt, and controlling the third pushing device to open a main furnace door of the main microwave pyrolysis furnace.
Preferably, the step of performing temperature-controlled cyclic pyrolysis treatment in the main microwave pyrolysis furnace further comprises:
when the temperature value is smaller than the preset temperature value, the second pushing device is controlled to lower the spiral conveying device, so that the materials are circularly conveyed along the material conveying belt, the spiral conveying device and the material conveying belt.
Preferably, the method further comprises the following steps:
the residue after the secondary pyrolysis treatment falls into a water pool from an outlet of the discharging device for water sealing;
the residue at the bottom of the pool is taken out by a slag extractor.
Preferably, the method further comprises the following steps:
volatile components generated after pyrolysis in the main microwave pyrolysis furnace and the auxiliary microwave pyrolysis furnace enter the condensing device through the first exhaust port and the second exhaust port respectively and are cooled into a liquid oil-water mixture;
introducing a liquid oil-water mixture generated in the condensing device into an oil-water separating device for separation and recovery;
the non-condensable gas generated in the condensing device is pumped away by the air pumping device.
The technical scheme of the embodiment of the invention has the following advantages:
according to the method for treating the oily sludge, provided by the embodiment of the invention, the oxygen content of the material is reduced through the material deoxidation treatment step, and the pyrolysis is ensured to be carried out in an anaerobic state. The horizontal conveying of material conveyer belt that the material passes through horizontal conveyor makes the material can be respectively in main, the pyrolysis of the even heating of assistance microwave pyrolysis stove in, has improved the material intensification pyrolysis degree of consistency, has improved pyrolysis efficiency. Through carrying out control by temperature change circulation pyrolysis treatment in main microwave pyrolysis stove, make the material reach and predetermine the pyrolysis temperature value, reach and predetermine just can pass through material conveyer belt output after the pyrolysis degree, further improved pyrolysis efficiency.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic configuration diagram showing a specific example of a system for treating oily sludge in example 1 of the present invention;
fig. 2 is a schematic structural view of a specific example of the screw conveyor in embodiment 1 of the present invention;
FIG. 3 is a flowchart showing a specific example of the method for treating oily sludge according to example 2 of the present invention.
Reference numerals: 1-a feeding device, 11-an upper bin, 12-a feeding deoxygenation bin, 121-an air inlet, 122-an air outlet, 13-a feeding bin, 14-a feeding bin gate, 15-a first pushing device, 2-a horizontal conveying device, 3-a main microwave pyrolysis furnace, 31-a spiral conveying device, 311-an upward spiral conveying slope, 312-a slope inlet, 313-a slope outlet, 314-a downward conveying channel, 32-a second pushing device, 33-a temperature detection device, 34-a main furnace door, 35-a third pushing device, 36-a first exhaust port, 4-an auxiliary microwave pyrolysis furnace, 41-a second exhaust port, 5-a microwave breach, 6-a condensing device, 7-an air extraction device, 8-an oil-water separation device, and 9-a discharging device, 91-slag extractor, 92-water pool, 10-frame.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In describing the present invention, it is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises" and/or "comprising," when used in this specification, are intended to specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The term "and/or" includes any and all combinations of one or more of the associated listed items. The terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention and for simplicity in description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. The terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The terms "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; can be mechanically or electrically connected; the two elements can be directly connected, indirectly connected through an intermediate medium, or communicated with each other inside; either a wireless or a wired connection. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
While the exemplary embodiments are described as performing an exemplary process using multiple units, it is understood that the exemplary process can also be performed by one or more modules. In addition, it is to be understood that the term controller/control unit refers to a hardware device that includes a memory and a processor. The memory is configured as a memory module and the processor is specifically configured to execute the processes stored in the memory module to thereby execute one or more processes.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
The embodiment provides a processing system of oil-containing sludge, which is mainly applied to the harmless and resource treatment of oil-containing sludge generated in the oil exploitation, refining and petrochemical industries, and as shown in fig. 1, the processing system comprises: the device comprises a feeding device 1, an upper material bin 11, a feeding deoxygenation bin 12, an air inlet 121, an air outlet 122, a feeding bin 13, a feeding bin door 14, a first pushing device 15, a horizontal conveying device 2, a main microwave pyrolysis furnace 3, a spiral conveying device 31, a second pushing device 32, a temperature detection device 33, a main furnace door 34, a third pushing device 35, a first exhaust port 36, an auxiliary microwave pyrolysis furnace 4, a second exhaust port 41, a microwave breach 5, a condensing device 6, an air extraction device 7, an oil-water separation device 8, a discharging device 9, a slag extractor 91, a water pool 92 and a rack 10. The feeding bin door 14, the horizontal conveying device 2, the main microwave pyrolysis oven 3, the auxiliary microwave pyrolysis oven 4 and the microwave breach 5 are sealed in a closed shell, and the shell is arranged on the rack 10.
The lower outlet of the feeding device 1 is positioned above the material conveying belt of the horizontal conveying device 2, and comprises a feeding bin gate 14 and a first pushing device 15, wherein the first pushing device 15 is connected with the feeding bin gate 14 and used for pushing the feeding bin gate 14 to open and close.
Preferably, the feeding device 1 further comprises: the device comprises an upper bin 11, a feeding deoxygenation bin 12 and a feeding bin 13, wherein the upper bin 11 is used for feeding materials from the upper bin 11, and the lower part of the upper bin 11 is provided with an air outlet 122; the feeding deoxidation bin 12 is hermetically connected between the upper bin 11 and the feeding bin 13, the upper part of the feeding deoxidation bin 12 is provided with an air inlet 121, and the air inlet 121 is used for introducing replacement gas to replace oxygen in the feeding deoxidation bin 12; the feeding bin 13 is used for feeding the materials deoxidized by the feeding deoxidation bin 12 into the feeding bin 13 and outputting the materials from a feeding bin gate 14. Preferably, the displacing gas comprises a reducing gas, such as nitrogen, carbon dioxide gas, or the like.
During operation, at first, the first thrust unit 15 of controller control promotes feed bin door 14, closes feed bin door 14, and the back in feed arrangement 1 is thrown to the material, lets in nitrogen gas in air inlet 121, and nitrogen gas is exported from gas outlet 122, and after oxygen was replaced and is accomplished, the first thrust unit 15 of controller control opened feed bin door 14, and the material after will deoxidizing is exported through the material conveyer belt of horizontal transport device 2, has reduced the oxygen content in the airtight shell, guarantees to be in anaerobic state.
The horizontal conveying device 2 comprises a material conveying belt and is used for conveying materials output from the feeding bin gate 14 to the main microwave pyrolysis oven 3, the auxiliary microwave pyrolysis oven 4 and the discharging device 9 in sequence. Preferably, ceramic plates are laid on the material conveying belt, so that materials on the conveying belt can be fully pyrolyzed, and the defect that materials with weak microwave fields on the metal surface cannot be pyrolyzed fully due to the use of metal is overcome.
Be equipped with microwave breach 5 and first exhaust port 36 in the top of main microwave pyrolysis oven 3 for emit the microwave in main microwave pyrolysis oven 3 through microwave breach 5, the volatile gas that produces after the material pyrolysis is exported through first exhaust port 36, main microwave pyrolysis oven 3 includes control by temperature change circulation conveyor, main door of a stove 34 and third thrust unit 35, control by temperature change circulation conveyor is used for the temperature of material in real-time detection main microwave pyrolysis oven 3 and controls the material according to the material temperature and carry out the circulation in main microwave pyrolysis oven 3 and carry until the material reaches and predetermine the temperature, the material that reaches predetermine the temperature is exported from main door of a stove 34 to assisting microwave pyrolysis oven 4, third thrust unit 35 and main door of a stove 34 are connected, be used for promoting main door of a stove 34 and open and close the action.
Preferably, the temperature controlled circulating conveyor comprises: a screw conveyer 31, a second pushing device 32 and a temperature detecting device 33. The spiral conveying device 31 is connected with the second pushing device 32 and is used for being close to or far away from the material conveying belt under the driving of the second pushing device 32 so as to change the conveying direction of the material, when the temperature detected by the temperature detecting device 33 does not reach a preset value, the spiral conveying device 31 is close to the material conveying belt, the material is spirally conveyed upwards along the spiral conveying device 31 and then falls back onto the material conveying belt, and therefore the material conveying belt and the spiral conveying device 31 are circularly conveyed; the second pushing device 32 is used for pushing the spiral conveying device 31 to move close to or away from the material conveying belt; the temperature detection device 33 is installed on the horizontal conveying device 2 below the inlet of the spiral conveying device 31 and used for detecting the temperature of the conveyed materials on the material conveying belt and outputting the detected value to control the actions of the second pushing device 32 and the third pushing device 35.
Preferably, the screw conveyor 31 comprises: an upward spiral conveying ramp 311 and a downward conveying channel 314. The second pushing device 32 is connected and mounted on the upward spiral conveying slope 311, for example, the upward spiral conveying slope 311 is hung, the upward spiral conveying slope 311 is used for conveying materials and comprises a slope inlet 312 and a slope outlet 313, the slope inlet 312 is arranged in front of the slope outlet 313 according to the conveying direction of the material conveying belt, the upward spiral conveying slope 311 can be a layer of spiral, for example, a spiral road shape, or a multilayer spiral and can be arranged according to the temperature and pyrolysis requirements, and the slope inlet is tightly attached to the material conveying belt when the upward spiral conveying slope 311 is close to the material conveying belt, so that the materials can be smoothly transferred from the material conveying belt to the upward spiral conveying slope through the slope inlet; the downward conveying channel 314 has one end connected to the slope outlet 313 and the other end disposed above the material conveying belt, for example, a straight or curved pipe. Preferably, the temperature detecting device 33 is installed on the horizontal conveyor 2 below the ramp entrance 312 for detecting the temperature of the material at the ramp entrance.
During operation, at first controller control third thrust unit 35 closes main door 34, the material spreads into main microwave pyrolysis oven 3 from the material conveyer belt in, the microwave breach output first power microwave in the main microwave pyrolysis oven 3, the heating material, temperature-detecting device 33 detects the material temperature and exports the temperature value that detects for the controller, the controller judges whether the temperature value reaches preset temperature value, if reach preset temperature value and indicate that the material has reached preset pyrolysis requirement in main microwave pyrolysis oven 3, the controller can control third thrust unit 35 and open main door 34, the material passes through the material conveyer belt after the first pyrolysis and exports to supplementary microwave pyrolysis oven 4 from main door 34. When the preset temperature value is not reached, the controller controls the second pushing device 32 to lower the spiral conveying device 31, so that the slope inlet is tightly attached to the material conveying belt, the material is conveyed along the material conveying belt, the upward spiral conveying slope 311, the downward conveying channel 314 and the material conveying belt are conveyed, circular conveying motion is performed in the main microwave pyrolysis furnace 3 until the temperature value detected by the temperature detection device arranged on the horizontal conveying device 2 at the slope inlet is judged to reach the preset temperature value by the controller, after the preset temperature value is reached, the controller controls the second pushing device 32 to lift the spiral conveying device 31, so that the slope inlet is separated from the material conveying belt, and the material is conveyed along the material conveying belt.
A microwave breach 5 and a second exhaust port 41 are arranged above the auxiliary microwave pyrolysis furnace 4 and used for emitting microwaves into the auxiliary microwave pyrolysis furnace 4 through the microwave breach 5 and outputting volatile gas generated after pyrolysis of the material through the second exhaust port 41. The microwave breach in the supplementary microwave pyrolysis oven 4 exports the second power microwave, and the second power can set up to be higher than the first power of microwave breach output in the main microwave pyrolysis oven 3 to realize the purpose of further improvement material pyrolysis degree, because main material pyrolysis has been fully accomplished in main microwave pyrolysis oven 3, first power is lower, so greatly reduced energy consumption, the energy consumption is low.
The microwave breach 5 is used for emitting the microwave to main microwave pyrolysis oven 3 and supplementary microwave pyrolysis oven 4, can carry out different settings according to actual need to the microwave power of radiation in main microwave pyrolysis oven 3 and the supplementary microwave pyrolysis oven 4, and the microwave power of radiation is higher or can all be low in the main microwave pyrolysis oven 3 than the microwave power of radiation in the supplementary microwave pyrolysis oven 4.
The inlet of the discharging device 9 is arranged at the lower rear part of the material conveying belt of the horizontal conveying device 2, and residual residues left after pyrolysis on the material conveying belt fall into the inlet of the discharging device 9 and then are output through the outlet of the discharging device 9.
Preferably, the discharging device 9 comprises: a slag extractor 91 and a water basin 92. The outlet of the discharging device 9 is positioned above the water pool 92; the slag extractor 91 is located in a pool 92 with its slag inlet end submerged below the pool water surface. The residue falling from the outlet of the discharging device 9 falls into the water tank 92 and is then carried out by the slag discharger 91.
The inlet of the condensing means 6 is connected to the first exhaust port 36 and the second exhaust port 41, respectively. The air extraction device 7 is connected with the upper outlet of the condensing device 6. The oil-water separation device 8 is connected with the lower outlet of the condensing device 6. The volatile components generated after pyrolysis in the main microwave pyrolysis furnace and the auxiliary microwave pyrolysis furnace enter the condensing device 6 through the first exhaust port 36 and the second exhaust port 41 respectively, are cooled into a liquid oil-water mixture, are introduced into the oil-water separation device 8 for separation and recovery, and then the non-condensable gas is pumped away (can be used as fuel) through the air pumping device 7.
Above-mentioned processing system of oiliness mud through setting up the feeding deoxidation storehouse, has reduced material oxygen content, has guaranteed that the pyrolysis goes on under anaerobic condition. Through setting up horizontal conveyor, make the material can be respectively in main, assist the pyrolysis of even heating in the microwave pyrolysis stove, improved the material intensification pyrolysis degree of consistency, improved pyrolysis efficiency. Through set up control by temperature change circulation conveyor, main furnace gate and third thrust unit in main microwave pyrolysis stove, make the material reach and predetermine the pyrolysis temperature value, reach and predetermine just can pass through material conveyer belt output after the pyrolysis degree, further improved pyrolysis efficiency.
Example 2
This example provides a method for treating oily sludge, which can be applied to the system for treating oily sludge of example 1, and comprises the following steps:
s1, controlling the first pushing device 15 to close the feed bin gate 14;
s2, after the materials are fed and deoxidized, controlling the first pushing device 15 to open the feeding bin gate 14, and conveying the deoxidized materials to the main microwave pyrolysis furnace 3 through the material conveying belt;
s3, controlling the third pushing device 35 to close the main oven door 34 of the main microwave pyrolysis oven 3;
s4, performing temperature control circulating pyrolysis treatment in the main microwave pyrolysis furnace 3, and conveying the materials subjected to the temperature control circulating pyrolysis treatment to the auxiliary microwave pyrolysis furnace 4 through a material conveying belt;
s5, carrying out secondary pyrolysis treatment in the auxiliary microwave pyrolysis furnace 4, and conveying residues after the secondary pyrolysis treatment to the discharging device 9 through the material conveying belt. And outputting second power microwaves through a microwave break port in the auxiliary microwave pyrolysis furnace 4 to heat the materials.
Preferably, the step of feeding and deoxygenating the material of S2 comprises:
s21, after the materials are put into the feeding bin 11, the feeding deoxygenation bin 12 and the feeding bin 13, introducing replacement gas from the gas inlet 121;
s22, detecting the oxygen content of the output gas from the gas outlet 122, judging whether the oxygen content is less than or equal to a preset oxygen content value, and obtaining the result of the deoxidation treatment when the oxygen content is less than or equal to the preset oxygen content value; when the oxygen content is larger than the preset oxygen content value, the incomplete deoxidation treatment result is obtained. The preset value of oxygen content is preferably about 1%.
Preferably, the step of performing the temperature controlled cyclic pyrolysis process in the main microwave pyrolysis oven 3 of S4 includes:
s41, outputting first power microwaves through a microwave break port in the main microwave pyrolysis furnace 3 to heat the materials;
s42, detecting a material temperature value by the temperature detection device 33;
s43, judging whether the temperature value is larger than or equal to a preset temperature value, wherein the preset temperature value represents a temperature value which needs to be reached by the materials after the materials are pyrolyzed in the main microwave pyrolysis furnace 3;
s44, when the temperature value is larger than or equal to the preset temperature value, controlling the second pushing device 32 to lift the spiral conveying device 31, so that the materials are directly conveyed along the material conveying belt, and controlling the third pushing device 35 to open the main oven door 34 of the main microwave pyrolysis oven 3;
and S45, when the temperature value is smaller than the preset temperature value, controlling the second pushing device 32 to lower the spiral conveying device 31, and enabling the materials to be circularly conveyed along the material conveying belt, the spiral conveying device 31 and the material conveying belt.
Preferably, the method for treating oily sludge further comprises the steps of:
s6, enabling the residues after the secondary pyrolysis treatment to fall into a water pool 92 from an outlet of the discharging device 9 for water sealing;
s7, the residue at the bottom of the pool 92 is taken out by the slag extractor 91.
Preferably, the method for treating oily sludge further comprises the steps of:
s8, enabling volatile components generated after pyrolysis in the main microwave pyrolysis furnace 3 and the auxiliary microwave pyrolysis furnace 4 to enter the condensing device 6 through the first exhaust port 36 and the second exhaust port 41 respectively, and cooling the volatile components into a liquid oil-water mixture;
s9, introducing the liquid oil-water mixture generated in the condensing device 6 into an oil-water separating device 8 for separation and recovery;
s10, the non-condensable gas generated in the condensing device 6 is pumped out through the air pumping device 7.
According to the method for treating the oily sludge, the oxygen content of the material is reduced through the material deoxidation treatment step, and the pyrolysis is ensured to be carried out in an anaerobic state. The horizontal conveying of material conveyer belt that the material passes through horizontal conveyor makes the material can be respectively in main, the pyrolysis of the even heating of assistance microwave pyrolysis stove in, has improved the material intensification pyrolysis degree of consistency, has improved pyrolysis efficiency. Through carrying out control by temperature change circulation pyrolysis treatment in main microwave pyrolysis stove, make the material reach and predetermine the pyrolysis temperature value, reach and predetermine just can pass through material conveyer belt output after the pyrolysis degree, further improved pyrolysis efficiency.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (4)
1. The method for treating the oily sludge is characterized by comprising the following steps of:
controlling a first pushing device (15) to close the feed bin door (14);
after the materials are fed and deoxidized, a first pushing device (15) is controlled to open a feeding bin gate (14), and the materials after being deoxidized are conveyed to a main microwave pyrolysis furnace (3) through a material conveying belt;
controlling a third pushing device (35) to close a main furnace door (34) of the main microwave pyrolysis furnace (3);
carrying out temperature control circulating pyrolysis treatment in the main microwave pyrolysis furnace (3), and conveying the materials subjected to the temperature control circulating pyrolysis treatment to the auxiliary microwave pyrolysis furnace (4) through a material conveying belt;
carrying out secondary pyrolysis treatment in the auxiliary microwave pyrolysis furnace (4), and conveying residues after the secondary pyrolysis treatment to a discharging device (9) through a material conveying belt;
the step of carrying out temperature control circulating pyrolysis treatment in the main microwave pyrolysis furnace (3) comprises the following steps:
a microwave break port in the main microwave pyrolysis furnace (3) outputs first power microwaves to heat the materials;
the temperature detection device (33) detects the temperature value of the material;
judging whether the temperature value is greater than or equal to a preset temperature value or not;
when the temperature value is larger than or equal to the preset temperature value, controlling a second pushing device (32) to lift the spiral conveying device (31) so that the materials are directly conveyed along the material conveying belt, and controlling a third pushing device (35) to open a main furnace door (34) of the main microwave pyrolysis furnace (3);
when the temperature value is smaller than the preset temperature value, the second pushing device (32) is controlled to lower the spiral conveying device (31), so that materials are conveyed along the material conveying belt, the spiral conveying device (31) and the material conveying belt in a circulating mode and do circulating conveying movement in the main microwave pyrolysis furnace until the temperature value detected by the temperature detector reaches the preset temperature value, the second pushing device is controlled to lift the spiral conveying device, the materials are conveyed along the material conveying belt, and the third pushing device is controlled to open a main furnace door of the main microwave pyrolysis furnace.
2. The method for treating oily sludge according to claim 1, wherein the step of feeding the material and deoxidizing comprises:
after the materials are put into the feeding bin (11), the feeding deoxygenation bin (12) and the feeding bin (13), replacement gas is introduced from the gas inlet (121);
detecting an oxygen content of the output gas from the gas outlet (122);
judging whether the oxygen content is less than or equal to an oxygen content preset value;
and when the oxygen content is less than or equal to the preset oxygen content value, obtaining the result of finishing the deoxidation treatment.
3. The method for treating oily sludge according to claim 1, characterized by further comprising the steps of:
the residues after the secondary pyrolysis treatment fall into a water pool (92) from an outlet of the discharging device (9) for water sealing;
the residue at the bottom of the pool (92) is carried out by a slag extractor (91).
4. The method for treating oily sludge according to any one of claims 1 to 3, characterized by further comprising the steps of:
volatile components generated after pyrolysis in the main microwave pyrolysis furnace (3) and the auxiliary microwave pyrolysis furnace (4) enter the condensing device (6) through the first exhaust port (36) and the second exhaust port (41) respectively, and are cooled into a liquid oil-water mixture;
the liquid oil-water mixture generated in the condensing device (6) is introduced into an oil-water separating device (8) for separation and recovery;
the non-condensable gas generated in the condensing device (6) is pumped away by the air pumping device (7).
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