Pyrolysis treatment device and method for oily sludge solid waste

Abstract

The invention discloses a microwave pyrolysis treatment device and method for oily sludge. The device comprises an input control system, a microwave pyrolysis system and a product collection system, the input control system is used for inputting inert gas into the microwave pyrolysis system and controlling the microwave pyrolysis process of a microwave generation device in the microwave pyrolysis system; the microwave pyrolysis system comprises a conveying cavity, a conveying mechanism arranged in the conveying cavity in a penetrating mode, a microwave generating device and a container used for being arranged on the conveying mechanism and containing oily sludge solid waste. The microwave generating device is used for performing microwave pyrolysis on the oily sludge solid waste conveyed on the conveying mechanism under the control of the input control system; the inlet end of the product collection system is connected with the outlet end of the microwave pyrolysis system; and the product collection system is used for collecting liquid and / or gas generated and discharged by microwave pyrolysis of the oily sludge solid waste. According to the invention, uniform heating for pyrolysis is realized, the pyrolysis temperature is reduced, the pyrolysis time is shortened, and the heating efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of industrial waste treatment, and in particular to a pyrolysis treatment device and method for oily sludge solid waste. Background Art

[0002] A large amount of oily sludge is generated during oilfield exploration, refining, and gathering. The composition of oily sludge is relatively complex, usually containing high concentrations of petroleum hydrocarbons, heavy metals, biomass and other substances. Oily sludge has been listed as hazardous waste by many countries. If improperly handled, it will pose a serious threat to the public environment and people's health. Therefore, it is necessary to dispose of oily sludge in a reasonable and environmentally friendly manner.

[0003] At present, the main methods for treating oily sludge include solidification, solvent extraction, microwave irradiation, bioremediation, pyrolysis and incineration. Among them, pyrolysis has strong operability and controllability in treating oily sludge solid waste. In addition, it also has the significant advantage of quickly realizing waste resource utilization and harmless treatment. The traditional pyrolysis method uses electric heating, but there are problems such as low heating efficiency and poor uniformity. Summary of the invention

[0004] In view of the above problems, the present invention is proposed to provide a device and method for pyrolysis treatment of oily sludge solid waste that overcomes the above problems or at least partially solves the above problems.

[0005] In a first aspect, an embodiment of the present invention provides a pyrolysis treatment device for oily sludge solid waste, which includes: an input control system, a microwave pyrolysis system, and a product collection system;

[0006] The input control system is used to input inert gas into the microwave pyrolysis system and control the microwave pyrolysis process of the microwave generating device in the microwave pyrolysis system;

[0007] The microwave pyrolysis system comprises: a transport cavity, a transport mechanism arranged in the transport cavity, a microwave generator, and a container arranged on the transport mechanism for containing oily sludge solid waste; the microwave generator is used to perform microwave pyrolysis on the oily sludge solid waste transported on the transport mechanism under the control of the input control system;

[0008] The inlet end of the product collection system is connected to the outlet end of the microwave pyrolysis system; the product collection system is used to collect liquid and / or gas generated and discharged by microwave pyrolysis of the oily sludge solid waste.

[0009] In one embodiment, the input control system includes a pyrolysis atmosphere assembly and a control device;

[0010] The pyrolysis atmosphere component is connected to the inlet of the transport cavity of the microwave pyrolysis system, and is used to continuously introduce inert gas into the transport cavity;

[0011] The control device is electrically connected to the microwave generator in the microwave pyrolysis system and is used to control process parameters during the microwave pyrolysis process. The process parameters include: pyrolysis time, pyrolysis power, pyrolysis temperature and injection time of the microwave generator.

[0012] In one embodiment, at least one temperature sensor for detecting temperature is disposed in the transport chamber; the temperature sensor is electrically connected to the control device;

[0013] The transport chamber is divided into a temperature rising section, a pyrolysis section and a temperature falling section in sequence; the temperature rising section is connected to the pyrolysis atmosphere component, and the temperature falling section is connected to the product collection system;

[0014] The control device is used to control the heating power of the microwave generating device based on the temperature detected by the at least one temperature sensor, so that the temperature rising section of the transport cavity raises the temperature of the oily sludge solid waste from room temperature to a first preset temperature value; and the temperature of the oily sludge solid waste in the pyrolysis section of the transport cavity is raised from the first preset temperature value to a second preset temperature value required for pyrolysis, and the set reaction time is maintained, and microwave heating is stopped in the temperature cooling section of the transport cavity.

[0015] In one embodiment, the input control system further comprises a mixing and conveying device; the mixing and conveying device is used to mix the oily sludge solid waste with the microwave absorbent.

[0016] The oily sludge solid waste mixed with the microwave absorbent is input into the container.

[0017] In one embodiment, the mixing and conveying device comprises: a mixing kettle, an electric opening and closing plate, a stirring paddle and a screw conveyor;

[0018] A partition is provided inside the mixing kettle, and the partition divides the internal space of the mixing kettle into a mixing chamber located at the upper side and a discharge chamber located at the lower side. A first input port and a second input port are provided at the upper end of the mixing kettle, and are respectively connected to the mixing chamber. The first input port is used to input oily sludge solid waste, and the second input port is used to input microwave absorbent. A through port penetrating the partition is provided on the partition;

[0019] The electric opening and closing plate is arranged in the through-opening, and is used to close the through-opening or open the through-opening;

[0020] The stirring paddle is arranged in the mixing chamber of the mixing kettle, and is used to mix the input oily sludge solid waste and microwave absorbent evenly;

[0021] The screw feeder is arranged in the discharge cavity of the mixing kettle, the feed inlet of the screw feeder is located directly below the through hole, and the discharge port of the screw feeder passes through the mixing kettle to transport the oily sludge solid waste mixed with microwave absorbent to the container.

[0022] In one embodiment, the mixing and conveying device further comprises a stirring motor for driving the stirring paddle to rotate.

[0023] In one embodiment, the microwave absorber is any one of the following or a combination of more: ferrosoferric oxide, boron nitride BN or silicon carbide SiC.

[0024] In one embodiment, the mass ratio of the microwave absorber to the mass ratio of the oily sludge solid waste is (0.2-1):10.

[0025] In one embodiment, the output power of the microwave generating device is continuously adjustable within the range of 0.01 to 4.20 kW, and the microwave frequency range is 2.45 GHz ± 25 MHz.

[0026] In one embodiment, the inert gas is nitrogen.

[0027] In one embodiment, the transport mechanism is a conveyor belt.

[0028] In one embodiment, the product collection system includes a liquid product collection mechanism and a gas product collection mechanism.

[0029] In a second aspect, an embodiment of the present invention provides a method for pyrolysis treatment using the pyrolysis treatment device for oily sludge solid waste as described above, comprising:

[0030] After mixing the oily sludge solid waste and the microwave absorbent, the mixture is input into a container for containing the oily sludge solid waste in the microwave pyrolysis system through an input control system;

[0031] Inert gas is introduced into the transport cavity of the microwave pyrolysis system; and when the transport mechanism of the microwave pyrolysis system transports the oily sludge solid waste through the transport cavity, the microwave generating device performs microwave pyrolysis on the oily sludge solid waste;

[0032] The liquid and / or gas generated and discharged by microwave pyrolysis of the oily sludge solid waste is collected by the product collection system.

[0033] The beneficial effects of the above technical solution provided by the embodiment of the present invention include at least:

[0034] The above-mentioned pyrolysis treatment device and method for oil-containing sludge solid waste provided in the embodiment of the present invention use microwaves to pyrolyze oil-containing sludge solid waste, which can achieve uniform pyrolysis heating, reduce pyrolysis temperature, improve pyrolysis efficiency, and the product is clean and pollution-free. The collected liquid and / or gas discharged during the pyrolysis process can also bring certain economic benefits. In addition, the innovative continuous microwave pyrolysis method makes the pyrolysis process controllable, which is helpful to study the pyrolysis process and regulate the pyrolysis parameters, and can cope with the environmentally friendly treatment of oil-containing sludge solids of different components and types.

[0035] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or be understood by practicing the present invention. The purpose and other advantages of the present invention can be achieved and obtained by the structures specifically pointed out in the written description, claims, and drawings. The technical scheme of the present invention is further described in detail below through drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0037] Figure 1 Schematic diagram of a continuous microwave pyrolysis treatment device for oily sludge solid waste in an embodiment of the present invention;

[0038] Figure 2 This is a table showing the test results of the residual oil content of the residue after different pyrolysis temperatures in the embodiments of the present invention;

[0039] Figure 3 Schematic diagram of a mixing and conveying device in an embodiment of the present invention;

[0040] Figure 4 It is a flow chart of a method for performing microwave pyrolysis treatment of oily sludge using a microwave pyrolysis treatment device for oily sludge according to an embodiment of the present invention;

[0041] 1. Input control system 2. Microwave pyrolysis system 3. Product collection system 4. Pyrolysis atmosphere assembly 5. Control panel 6. Mixing and conveying device;

[0042] 21. Transport chamber 22. Conveying mechanism 23. Microwave generating device 24. Container;

[0043] 61. Mixing kettle 62. Electric opening and closing plate 63. Stirring paddle 64. Screw conveyor 65. Stirring motor;

[0044] 611. partition 612. mixing chamber 613. discharge chamber 614. first input port 615. second input port 641. input port 642. discharge port;

[0045] 6111.Through the mouth. DETAILED DESCRIPTION

[0046] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0047] The embodiment of the present invention provides a pyrolysis treatment device for oily sludge solid waste, referring to Figure 1 ,include:

[0048] Input control system 1, microwave pyrolysis system 2 and product collection system 3; wherein:

[0049] An input control system 1 is used to input an inert gas into the microwave pyrolysis system 2 and control the microwave pyrolysis process of a microwave generating device in the microwave pyrolysis system 2;

[0050] The microwave pyrolysis system 2 comprises: a transport cavity 21, a transport mechanism 22 provided in the transport cavity, a microwave generator 23, and a container 24 for containing oily sludge solid waste provided on the transport mechanism 22; the microwave generator 23 is used to perform microwave pyrolysis on the oily sludge solid waste transported on the transport mechanism 22 under the control of the input control system 1;

[0051] The inlet end of the product collection system 3 is connected to the outlet end of the microwave pyrolysis system 2; the product collection system 3 is used to collect liquid and / or gas generated and discharged by microwave pyrolysis of oily sludge solid waste.

[0052] The above-mentioned oily sludge microwave pyrolysis treatment device provided by the embodiment of the present invention uses microwaves to pyrolyze oily sludge solid waste, which can achieve uniform pyrolysis heating, reduce pyrolysis temperature, improve pyrolysis efficiency, and the product is clean and pollution-free. The collected liquid and / or gas discharged during the pyrolysis process can also bring certain economic benefits. The innovative continuous microwave pyrolysis device makes the pyrolysis process controllable, which is helpful for studying the pyrolysis process and regulating pyrolysis parameters, and can deal with oily sludge of different components and types.

[0053] Further, the input control system 1 includes a pyrolysis atmosphere component 4 and a control device;

[0054] The pyrolysis atmosphere component 4 is connected to the inlet of the transport chamber 21 of the microwave pyrolysis system 2, and is used to continuously introduce an inert gas (such as nitrogen, etc.) into the transport chamber 21;

[0055] The control device is electrically connected to the microwave generator in the microwave pyrolysis system and is used to control the process parameters during the microwave pyrolysis process, wherein the process parameters include: pyrolysis time, pyrolysis power, pyrolysis temperature and injection time of the microwave generator.

[0056] Specifically, refer to Figure 1 As shown, in a specific implementation, the above control device can be implemented through a control panel 5; the control panel includes a controller (such as a PLC controller) for controlling the heating power of the pyrolysis generating device. In one embodiment, the control panel 5 also includes a display screen for setting parameters such as pyrolysis time, pyrolysis power, pyrolysis temperature, and injection time. The display screen of the control panel 5 is, for example, 7 inches in size, is touch screen operated, PLC controlled, and can display curves in real time.

[0057] The microwave pyrolysis system 2 has an inlet end and an outlet end. The gas outlet of the atmosphere component 4 is connected to the inlet end of the microwave pyrolysis system 2 to provide inert gas into the microwave pyrolysis system 2 so as to make the transport cavity in an oxygen-deficient or oxygen-free state, thereby facilitating reliable pyrolysis.

[0058] The inlet end of the product collection system 3 is connected to the outlet end of the microwave pyrolysis system 2 so that the product after pyrolysis by the microwave pyrolysis system 2 is collected in the product collection system 3;

[0059] The microwave pyrolysis system 3 may include a transport cavity 21 , a conveying mechanism 22 , a microwave generating device 23 and a container 24 (eg, a crucible) for containing oily sludge solid waste. The conveying mechanism 22 is disposed in the transport cavity 21 , and the crucible is disposed on the conveying mechanism 22 .

[0060] The embodiment of the present invention is not limited to the above-mentioned container, and other containers that can withstand high temperature pyrolysis and do not chemically react with the sludge can be used.

[0061] In one embodiment, the conveying mechanism 22 may be a conveyor belt, or other structures that can smoothly transport containers.

[0062] In one embodiment, at least one temperature sensor for detecting temperature may be disposed in the transport chamber 21; the temperature sensor is electrically connected to the control device.

[0063] In one embodiment, referring to Figure 1 As shown, the transport chamber 21 is divided into a temperature rising section, a pyrolysis section and a temperature falling section in sequence. The temperature rising section is connected to the pyrolysis atmosphere component. Specifically, the temperature rising section is connected to the outlet of the pyrolysis atmosphere component 4 of the input control system 1, and the temperature falling section is connected to the product collection system 3.

[0064] In one embodiment, the pyrolysis section is located in the middle of the microwave pyrolysis system 2, the output power of the microwave generating device 23 is continuously adjustable between 0.01 and 4.20 kW, the microwave frequency range is 2.45 GHz ± 25 MHz, and the temperature can be measured using a temperature sensor.

[0065] In one embodiment, the residual oil content of the residue after being pyrolyzed at different temperatures is tested. Figure 2 As shown, the original oil content of the oily sludge used is 21.53%, and the oil content of the oily sludge sample obtained by pyrolysis at 350°C using a continuous microwave pyrolysis treatment device can be less than 2%.

[0066] In one embodiment, the input control system 1 may further include a mixing conveying device 6, Figure 3 As shown, the mixing and conveying device 6 includes:

[0067] The mixing kettle 61 has a partition 611 inside, and the partition 611 divides the internal space of the mixing kettle 61 into a mixing chamber 612 located at the upper side and a discharge chamber 613 located at the lower side. The upper end of the mixing kettle 61 has a first input port 614 and a second input port 615 connected to the mixing chamber 612. The first input port 614 is used to input oily sludge solid waste, and the second input port 615 is used to input microwave absorbent. The partition 611 has a through port 6111 penetrating the partition 611.

[0068] The electric opening and closing plate 62 is disposed in the through-opening 6111 and is used to close the through-opening 6111 or open the through-opening 6111;

[0069] The stirring paddle 63 rotates the mixing chamber 612 disposed in the mixing kettle 61 to mix the input oily sludge solid waste and the microwave absorbent uniformly;

[0070] A stirring motor 65, used to drive the stirring paddle 63 to rotate;

[0071] The screw conveyor 64 is arranged in the discharge chamber 613 of the mixing kettle 61. The feed inlet 641 of the screw conveyor 64 is located directly below the through-hole 6111. The discharge port 642 of the screw conveyor 64 passes through the mixing kettle 61 and is used to convey the oily sludge solid waste mixed with microwave absorbent to the container 24 (such as a crucible).

[0072] The oily sludge solid waste and the microwave absorbent can be reliably mixed and input into the container 24 through the mixing and conveying device 6 , and the efficiency and uniformity of microwave heating can be effectively improved through the microwave absorbent.

[0073] In one implementation, preferably, the mass ratio of the microwave absorber to the mass ratio of the oily sludge solid waste is (0.2-1):10.

[0074] In one embodiment, preferably, the microwave absorbent can be ferrosoferric oxide.

[0075] Ferroferric oxide is a magnetic substance that can be recycled and reused through magnetic adsorption, reducing the cost of the pyrolysis treatment process of oily sludge solid waste and achieving environmentally friendly reuse of materials.

[0076] In one embodiment, the microwave absorber may also be boron nitride BN or silicon carbide SiC.

[0077] The above product collection system may include a liquid product collection mechanism and a gas product collection mechanism. Liquid products include water, various light oils, etc., and gas products include C1-C4 hydrocarbon compounds, H2, CO, etc.

[0078] Based on the same inventive concept, an embodiment of the present invention also provides a method for pyrolysis treatment using the pyrolysis treatment device for oily sludge solid waste as mentioned above. Since the principle of this method is similar to that of the pyrolysis treatment device for oily sludge solid waste mentioned above, the implementation of this method can refer to the implementation of the aforementioned device, and the repeated parts will not be repeated.

[0079] The embodiment of the present invention provides a method for performing microwave pyrolysis treatment of oily sludge using the above-mentioned microwave pyrolysis treatment device for oily sludge, referring to Figure 4 As shown, including:

[0080] S41, mixing the oily sludge solid waste and the microwave absorbent, and inputting the mixture into a container for containing the oily sludge solid waste in the microwave pyrolysis system through an input control system;

[0081] For example, the oily sludge solid waste and the microwave absorbent are put into the mixing chamber on the upper side of the mixing kettle through the first and second input ports, mixed evenly, and then put into the crucible.

[0082] S42, introducing an inert gas into the transport cavity in the microwave pyrolysis system; and performing microwave pyrolysis on the oily sludge solid waste by a microwave generating device during the process in which the transport mechanism in the microwave pyrolysis system transports the oily sludge solid waste through the transport cavity;

[0083] In this step, the inert gas in the pyrolysis atmosphere component is input into the transport chamber of the microwave pyrolysis system so that the transport chamber is in an oxygen-deficient or oxygen-free state, which facilitates reliable pyrolysis.

[0084] The oily sludge solid waste mixed with microwave absorbent is conveyed into the crucible through a screw conveyor, and the crucible enters the transport cavity of the microwave pyrolysis system through a conveying mechanism for full pyrolysis.

[0085] S43. Collecting the liquid and / or gas generated and discharged by microwave pyrolysis of the oily sludge solid waste through the product collection system.

[0086] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A pyrolysis treatment device for oily sludge solid waste, characterized in that: include: Input control system, microwave pyrolysis system and product collection system; The input control system is used to input inert gas into the microwave pyrolysis system and control the microwave pyrolysis process of the microwave generating device in the microwave pyrolysis system; The microwave pyrolysis system comprises: a transport cavity, a transport mechanism arranged in the transport cavity, a microwave generating device, and a container arranged on the transport mechanism for containing oily sludge solid waste; The microwave generating device is used to perform microwave pyrolysis on the oily sludge solid waste transported by the transport mechanism under the control of the input control system; The inlet end of the product collection system is connected to the outlet end of the microwave pyrolysis system; the product collection system is used to collect liquid and / or gas generated and discharged by microwave pyrolysis of the oily sludge solid waste.

2. The device according to claim 1, characterized in that The input control system includes a pyrolysis atmosphere component and a control device; The pyrolysis atmosphere component is connected to the inlet of the transport cavity of the microwave pyrolysis system, and is used to continuously introduce inert gas into the transport cavity; The control device is electrically connected to the microwave generator in the microwave pyrolysis system and is used to control process parameters during the microwave pyrolysis process. The process parameters include: pyrolysis time, pyrolysis power, pyrolysis temperature and injection time of the microwave generator.

3. The device according to claim 2, characterized in that At least one temperature sensor for detecting temperature is disposed in the transport chamber; the temperature sensor is electrically connected to the control device; The transport chamber is divided into a temperature rising section, a pyrolysis section and a temperature falling section in sequence; the temperature rising section is connected to the pyrolysis atmosphere component, and the temperature falling section is connected to the product collection system; The control device is used to control the heating power of the microwave generating device based on the temperature detected by the at least one temperature sensor, so that the temperature rising section of the transport cavity raises the oily sludge solid waste from room temperature to a first preset temperature value; And in the pyrolysis section of the transport cavity, the oily sludge solid waste is heated from a first preset temperature value to a second preset temperature value required for pyrolysis, and the set reaction time is maintained, and microwave heating is stopped in the temperature reduction section of the transport cavity.

4. The device according to claim 2, characterized in that The input control system also includes a mixing and conveying device; the mixing and conveying device is used to mix the oily sludge solid waste with the microwave absorbent. The oily sludge solid waste mixed with the microwave absorbent is input into the container.

5. The device according to claim 4, characterized in that The mixing and conveying device comprises: a mixing kettle, an electric opening and closing plate, a stirring paddle and a screw conveyor; A partition is provided inside the mixing kettle, and the partition divides the internal space of the mixing kettle into a mixing chamber located at the upper side and a discharge chamber located at the lower side. A first input port and a second input port are provided at the upper end of the mixing kettle, and are respectively connected to the mixing chamber. The first input port is used to input oily sludge solid waste, and the second input port is used to input microwave absorbent. A through port penetrating the partition is provided on the partition; The electric opening and closing plate is arranged in the through-opening, and is used to close the through-opening or open the through-opening; The stirring paddle is arranged in the mixing chamber of the mixing kettle, and is used to mix the input oily sludge solid waste and microwave absorbent evenly; The screw feeder is arranged in the discharge cavity of the mixing kettle, the feed inlet of the screw feeder is located directly below the through hole, and the discharge port of the screw feeder passes through the mixing kettle to transport the oily sludge solid waste mixed with microwave absorbent to the container.

6. The device according to claim 5, characterized in that The mixing and conveying device also includes a stirring motor for driving the stirring paddle to rotate.

7. The device according to claim 5, characterized in that The microwave absorbent is any one of the following or a combination of more than one of them: ferrosoferric oxide, boron nitride BN or silicon carbide SiC.

8. The device according to claim 5, characterized in that The mass ratio of the microwave absorber to the oily sludge solid waste is (0.2-1):

10.

9. The device according to any one of claims 1 to 7, characterized in that: The output power of the microwave generating device is continuously adjustable within the range of 0.01 to 4.20 kW, and the microwave frequency range is 2.45 GHz ± 25 MHz.

10. The device according to any one of claims 1 to 7, characterized in that: The inert gas is nitrogen.

11. The device according to any one of claims 1 to 7, characterized in that: The conveying mechanism is a conveyor belt.

12. The device according to any one of claims 1 to 7, characterized in that: The product collection system includes a liquid product collection mechanism and a gas product collection mechanism.

13. A method for pyrolysis treatment of oily sludge solid waste using the pyrolysis treatment device according to any one of claims 1 to 12, characterized in that: include: After mixing the oily sludge solid waste and the microwave absorbent, the mixture is input into a container for containing the oily sludge solid waste in the microwave pyrolysis system through an input control system; Inert gas is introduced into the transport cavity of the microwave pyrolysis system; and when the transport mechanism of the microwave pyrolysis system transports the oily sludge solid waste through the transport cavity, the microwave generating device performs microwave pyrolysis on the oily sludge solid waste; The liquid and / or gas generated and discharged by microwave pyrolysis of the oily sludge solid waste is collected by the product collection system.

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