CN111471477A - Process for mixing oil-based drilling cuttings and calcium oxide - Google Patents
Process for mixing oil-based drilling cuttings and calcium oxide Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G1/00—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal
- C10G1/002—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal in combination with oil conversion- or refining processes
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
- C10G2300/10—Feedstock materials
- C10G2300/1003—Waste materials
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
- C10G2300/40—Characteristics of the process deviating from typical ways of processing
- C10G2300/4006—Temperature
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
- C10G2300/80—Additives
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Abstract
The invention provides a process for mixing and treating oil-based drill cuttings and calcium oxide, which comprises the following steps: (1) mixing the pretreated oil-based drilling cuttings and the preheated calcium oxide to obtain a mixture; (2) pyrolyzing the mixture to obtain pyrolysis oil gas, high-temperature flue gas and pyrolysis solid residues; (3) and condensing and separating the pyrolysis oil gas to obtain pyrolysis oil and non-condensable gas. The treatment process of the mixed treatment process of the oil-based drilling cuttings and the calcium oxide provided by the invention is clean and energy-saving, has no pollutant discharge and low environmental odor, and can realize high-efficiency treatment of the oil-based drilling cuttings.
Description
Technical Field
The invention relates to a process for mixing and treating oil-based drilling cuttings and calcium oxide, and belongs to the technical field of oil-containing solid waste treatment.
Background
Currently, drilling with oil-based mud during the production of shale gas, the drill bit cuttings the rock in the formation to produce large quantities of cuttings which are carried to the surface by the carry over action of the oil-based mud, thereby forming oil-based cuttings. Oil-based drill cuttings contain pollutants such as petroleum hydrocarbons, heavy metals and organic matters, are listed in national hazardous wastes (national hazardous waste catalogue, HW08), and can cause serious harm to the surrounding ecological environment if directly discharged without being treated. Emission standards in many parts of the world specify that less than 1% by weight of Total Petroleum Hydrocarbons (TPH) in drill cuttings can be emitted.
Therefore, the treatment method of the oil-based drilling cuttings at home and abroad is widely researched, and the treatment methods generally adopted at present mainly comprise an incineration method, a burying method, an underground reinjection method, a solidification method, a solvent extraction method, a heat treatment method, a centrifugal separation method and the like. Compared with the treatment methods comprehensively, the pyrolysis treatment technology has strong adaptability to materials, simple process principle, flexible treatment mode, high efficiency, small equipment floor area, non-landing treatment capability, all-weather working capability, less secondary pollution generated in the treatment process and advantages in resource recycling, thereby becoming a hotspot technology for treating the oily drilling cuttings. The thermal desorption treatment technology is mainly characterized in that under the anaerobic condition, a material is heated in a thermal desorption furnace to reach the boiling point of volatile substances in the material, and the volatile substances are evaporated and removed from the material. The treatment method has a good effect of removing oil in the oil-containing drill cuttings, the oil content of the treated residue can be reduced to below 0.3 wt%, and hydrocarbon resources in the drill cuttings can be recovered.
Chinese patent CN104178200A discloses a thermal desorption treatment method for oil-based drill cuttings, which comprises the steps of pretreating the oil-based drill cuttings, conveying the pretreated oil-based drill cuttings to a treatment unit, heating the oil-based drill cuttings to raise the reaction temperature to the volatilization temperature of each component hydrocarbon in the drill cuttings, keeping a certain retention time until oil gas is completely volatilized, storing and discharging the treated drill cuttings through a discharging device, allowing the oil gas to enter a recovery and separation unit through a gas outlet device, recovering components with different condensation points in different condensation and recovery units, keeping the quality of the recovered oil unchanged, and preparing the oil-based drilling fluid again. However, the treatment method is difficult to strictly seal in the pyrolysis process, the smell is large in the pyrolysis process, and the pollution to the pyrolysis working environment is large.
Chinese patent CN108343391A discloses a roller type drill cutting treatment thermal separation structure, which comprises a thermal separation outer cylinder, a thermal separation roller and a thermal separation auxiliary structure. The drill cuttings enter a thermal separation area formed by the inner wall of the thermal separation outer cylinder body and the outer wall of the thermal separation roller body through the drill cuttings inlet, the thermal separation roller body is driven by a power end to rotate, so that the drill cuttings and the thermal grinding body in the thermal separation area are continuously ground and continuously heated to volatilize a liquid phase in the drill cuttings, a solid phase in the volatilized thermal gas is filtered by a screen, the volatilized thermal gas enters the gas accumulation cavity through the thermal gas inlet and is discharged from the conical thermal gas outlet with the shape of a flow passage and the sectional area reduced in an accelerated mode, and the solid phase is discharged from the residue outlet. However, the ash content in the pyrolysis volatile component is high due to the drum structure, and meanwhile, the heat value of pyrolysis gas generated in the pyrolysis process cannot be fully utilized due to electric heating, so that the energy utilization rate of the whole process is low, and the obtained solid ash is still dangerous waste and is not recycled.
Therefore, providing a novel oil-based drill cutting and calcium oxide mixing treatment process has become a technical problem to be solved in the field.
Disclosure of Invention
In order to solve the disadvantages and shortcomings, the invention aims to provide a process for mixing oil-based drill cuttings and calcium oxide.
In order to achieve the above object, the present invention provides a process for mixing oil-based drill cuttings and calcium oxide, wherein the process comprises the following steps:
(1) mixing the pretreated oil-based drilling cuttings and the preheated calcium oxide to obtain a mixture;
(2) pyrolyzing the mixture to obtain pyrolysis oil gas, high-temperature flue gas and pyrolysis solid residues;
(3) and condensing and separating the pyrolysis oil gas to obtain pyrolysis oil and non-condensable gas.
In the above process, the pretreatment of the oil-based drill cuttings is conventional in the art, and includes, for example, drying, screening, etc.
Preferably, the process further comprises: and manufacturing the baking-free brick by utilizing the pyrolysis solid residue.
Preferably, the process further comprises: and (3) using the non-condensable gas in the step (3) as fuel gas in the pyrolysis process in the step (2).
Preferably, the process further comprises the step of enabling the high-temperature flue gas to sequentially pass through all stages of heat exchangers and sequentially exchange heat.
Preferably, the process further comprises the steps of enabling the high-temperature flue gas to exchange heat through a waste heat boiler to obtain low-temperature flue gas, and enabling the low-temperature flue gas to exchange heat through a heat accumulating type heat exchanger to obtain cooling flue gas.
Preferably, the process further comprises discharging the cooled flue gas after dedusting by a deduster.
Preferably, the process further comprises discharging the cooled flue gas subjected to dust removal by the dust remover after being subjected to desulfurization and denitrification treatment in a desulfurization and denitrification device.
In the process, firstly, the high-temperature flue gas is cooled in a waste heat boiler to obtain low-temperature flue gas, the low-temperature flue gas exchanges heat with air in a heat accumulating type heat exchanger in the heat accumulating type heat exchanger to obtain cooled flue gas, and the cooled flue gas is sequentially sent into a dust remover and a desulfurization and denitrification device to be subjected to dust removal, desulfurization and denitrification treatment so as to enable the heavy metal content to reach the standard, and then is directly discharged through a smoke exhaust device.
The invention does not make specific requirements on the temperature of high-temperature flue gas after pyrolysis, low-temperature flue gas after temperature reduction by a waste heat boiler and cooling flue gas after heat exchange by a heat accumulating type heat exchanger, and technicians in the field can reasonably adjust the temperature according to the field operation needs as long as the aim of the invention can be realized.
Preferably, the process further comprises metering the batch prior to pyrolysis thereof.
In the above process, preferably, the pyrolysis is performed in a moving bed pyrolysis furnace, the moving bed pyrolysis furnace is a pyrolysis furnace with an annular sealing structure, and includes a gas heating zone and an inner material pyrolysis zone, and the gas heating zone is provided with a heat accumulating type gas radiation pipe.
In the above process, the mixing ratio of the pretreated oil-based drill cuttings and the preheated calcium oxide and the temperature of the preheated calcium oxide are in a dynamic balance relationship, and the mixing ratio of the pretreated oil-based drill cuttings and the preheated calcium oxide and the specific temperature of the preheated calcium oxide can be adjusted according to the specific heat and the heat transfer efficiency of the materials during field operation, but the temperature of the oil-based drill cuttings can be heated to the thermal desorption temperature after the pretreated oil-based drill cuttings and the preheated calcium oxide are mixed; in addition, the invention does not have specific requirements on the temperature of the pyrolysis process in the step (2), and the skilled in the art can reasonably set the pyrolysis temperature according to the field needs as long as the mixed material can be pyrolyzed to obtain pyrolysis oil and non-condensable gas.
In a more preferred embodiment of the invention, the temperature of the preheated calcium oxide is 750 ℃;
the mass ratio of the pretreated oil-based drilling cuttings to the preheated calcium oxide is 1: 1.5;
the temperature of the pyrolysis reaction is 300 ℃, and the reaction time is 1 h.
In the above step (1), the pretreated oil-based drill cuttings and the preheated calcium oxide are mixed, and first, the preheated calcium oxide functions as a solid heat carrier and is used as a heat source for heating the oil-based drill cuttings;
second, oxygenCalcium chloride can react with H in the thermal desorption (pyrolysis) process2S、SO2、COS、CO2By reaction with steam or the like, H2S and other reactants are impurities in the pyrolysis product and can affect the quality of the product, so that the quality of the pyrolysis product is improved by adding calcium oxide, the reactions are exothermic reactions, and energy released in the reaction processes can play a role in reducing energy consumption;
thirdly, the calcium oxide also plays a role of catalytic cracking in the thermal desorption process, and can catalytically crack some heavy components into light components;
finally, the calcium oxide also has a sulfur fixation effect, solves the problem of odor (stink) in the treatment process of the oil-based drilling cuttings, can obviously improve the environmental odor, and meets the requirement of environment-friendly treatment of solid hazardous waste; the calcium oxide also plays a role in fixing heavy metal elements and polycyclic aromatic hydrocarbons in the solid phase, the environmental risk of the solid phase is reduced, and simultaneously through the quenching and tempering of the calcium oxide, the composition of the solid phase after thermal desorption is closer to that of concrete and baking-free bricks, and the resource utilization of the solid phase is promoted.
To further illustrate the process of the oil-based drill cuttings and calcium oxide mixing treatment of the present invention, the present invention also provides a system for oil-based drill cuttings and calcium oxide mixing treatment for implementing the above process of oil-based drill cuttings and calcium oxide mixing treatment, comprising:
the device comprises an oil-based drilling cutting pretreatment device, a calcium oxide preheating device, a mixing device, a feeding device, a moving bed pyrolysis furnace and a condensation separation device;
the oil-based drilling cutting pretreatment device and the calcium oxide preheating device are respectively used for pretreating oil-based drilling cutting and preheating calcium oxide;
outlets of the oil-based drilling cutting pretreatment device and the calcium oxide preheating device are respectively connected with the mixing device through pipelines;
the feeding device is used for conveying the mixed materials in the mixing device to the moving bed pyrolysis furnace; and a pyrolysis oil gas outlet of the moving bed pyrolysis furnace is connected with the condensation separation device through a pipeline.
Further, the system also comprises a baking-free brick manufacturing device, and a pyrolysis solid residue outlet of the moving bed pyrolysis furnace is connected with a pyrolysis solid residue inlet of the baking-free brick manufacturing device.
In the system, further, a pyrolysis solid residue outlet of the moving bed pyrolysis furnace is connected with a pyrolysis solid residue inlet of the baking-free brick manufacturing device through a feeding screw.
In the system described above, further, the non-condensable gas outlet of the condensation separation device is connected to the gas inlet of the moving bed pyrolysis furnace through a pipeline.
Further, the system also comprises a flue gas heat exchange device and a smoke exhaust device, wherein the flue gas heat exchange device is communicated with a flue gas outlet of the moving bed pyrolysis furnace; the smoke exhaust device is communicated with the smoke heat exchange device and exhausts smoke.
Further, the flue gas heat exchange device comprises a multi-stage heat exchanger, and high-temperature flue gas generated by the moving bed pyrolysis furnace sequentially passes through the heat exchangers at all stages and sequentially exchanges heat.
Further, each stage of the heat exchanger comprises: the waste heat boiler is communicated with a flue gas outlet of the moving bed pyrolysis furnace and exchanges heat with high-temperature flue gas generated by the moving bed pyrolysis furnace;
and the heat accumulating type heat exchanger is communicated with the waste heat boiler and exchanges heat with low-temperature flue gas generated by the waste heat boiler.
Further, the system further comprises:
the dust remover is arranged between the flue gas heat exchange device and the smoke exhaust device, and is communicated with a cold end outlet of the flue gas heat exchange device;
and the desulfurization and denitrification device is arranged between the dust remover and the smoke exhaust device and is communicated with the dust remover and the smoke exhaust device.
Further, the fume extractor may be a chimney.
In the system, further, a material metering device is arranged at the lower end of the feeding device and is used for metering the mixture fed into the moving bed pyrolysis furnace.
In the system, further, the moving bed pyrolysis furnace is a pyrolysis furnace with an annular sealing structure, and comprises a gas heating area and an inner material pyrolysis area (an internal pyrolysis reaction chamber), wherein the gas heating area is provided with a heat accumulating type gas radiation pipe.
In the system, the oil-based drilling cutting pretreatment device, the calcium oxide preheating device, the mixing device, the feeding device, the moving bed pyrolysis furnace, the condensation separation device, the waste heat boiler, the regenerative heat exchanger, the dust remover, the desulfurization and denitrification device, the smoke exhaust device and the like are conventional equipment in the field.
In the prior art, the oil-based drilling cuttings can not be subjected to odorless solid-liquid separation by adopting independent conventional pyrolysis equipment. The invention solves the problem of odor (stink) in the treatment process of the oil-based drilling cuttings by utilizing the sulfur fixation effect of the calcium oxide, can obviously improve the environmental odor, meets the environment-friendly treatment requirement of solid hazardous waste, and can effectively reduce the investment and the occupied area; in addition, the invention leads the non-condensable gas after the pyrolysis oil gas is condensed and separated into the heat accumulating type fuel gas radiant tube of the moving bed pyrolysis furnace, thereby improving the energy utilization rate and reducing the equipment investment cost.
In conclusion, the treatment process of the process provided by the invention is clean and energy-saving, has no pollutant discharge and low environmental odor, and can realize the high-efficiency treatment of the oil-based drilling cuttings; the system is easy to operate, the equipment runs stably and reliably, the heat efficiency of the whole system is high, the running cost is low, and the economic benefit is high.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be 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 these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a system for mixing and treating oil-based drill cuttings and calcium oxide according to embodiment 1 of the present invention.
Fig. 2 is a flowchart of a process of mixing oil-based drill cuttings and calcium oxide according to example 2 of the present invention.
The main reference numbers illustrate:
1. an oil-based drilling cutting pretreatment device;
2. a calcium oxide preheating device;
3. a mixing device;
4. a feeding device;
5. a moving bed pyrolysis furnace;
6. a baking-free brick manufacturing device;
7. a condensation separation device;
8. a waste heat boiler;
9. a regenerative heat exchanger;
10. a dust remover;
11. a desulfurization and denitrification device;
12. and (4) a chimney.
Detailed Description
In order to clearly understand the technical features, objects and advantages of the present invention, the following detailed description of the technical solutions of the present invention will be made with reference to the following specific examples, which should not be construed as limiting the implementable scope of the present invention.
Example 1
The embodiment provides a system for the mixed treatment of oil-based drill cuttings and calcium oxide, the structural schematic diagram of which is shown in fig. 1, and as can be seen from fig. 1, the system comprises:
the device comprises an oil-based drilling cutting pretreatment device 1, a calcium oxide preheating device 2, a mixing device 3, a feeding device 4, a moving bed pyrolysis furnace 5, a condensation separation device 7, a baking-free brick manufacturing device 6, a waste heat boiler 8, a heat accumulating type heat exchanger 9, a dust remover 10, a desulfurization and denitrification device 11 and a chimney 12;
the oil-based drilling cutting pretreatment device and the calcium oxide preheating device are respectively used for pretreating oil-based drilling cutting and preheating calcium oxide;
outlets of the oil-based drilling cutting pretreatment device and the calcium oxide preheating device are respectively connected with the mixing device through pipelines;
the feeding device is used for conveying the mixed materials in the mixing device to the moving bed pyrolysis furnace; a pyrolysis oil gas outlet of the moving bed pyrolysis furnace is connected with the condensation separation device through a pipeline;
a pyrolysis solid residue outlet of the moving bed pyrolysis furnace is connected with a pyrolysis solid residue inlet of the baking-free brick manufacturing device;
a pyrolysis solid residue outlet of the moving bed pyrolysis furnace is connected with a pyrolysis solid residue inlet of the baking-free brick manufacturing device through a feeding screw;
a non-condensable gas outlet of the condensation separation device is connected with a gas inlet of the moving bed pyrolysis furnace through a pipeline;
a high-temperature flue gas outlet of the moving bed pyrolysis furnace is connected with the chimney through a waste heat boiler, a heat accumulating type heat exchanger, a dust remover and a desulfurization and denitrification device in sequence through pipelines;
a material meter is arranged at the lower end of the feeding device;
the moving bed pyrolysis furnace is a pyrolysis furnace with an annular sealing structure and comprises a gas heating area and an inner layer material pyrolysis area, and the gas heating area is provided with a heat accumulating type gas radiant tube.
Example 2
The present embodiment provides a process for mixing and treating oil-based drill cuttings and calcium oxide, which is implemented by using the system for mixing and treating oil-based drill cuttings and calcium oxide provided in embodiment 1, and a flow chart of the process is shown in fig. 2, and as can be seen from fig. 2, the process includes the following specific steps:
spin-drying and screening oil-based drilling cutting materials (numbered ZX-G) taken from the Changning-Weiyuan shale gas demonstration area; wherein the composition information of the oil-based drilling cutting material is shown in the following table 1;
TABLE 1
Note that:*representative is obtained by subtraction.
Preheating calcium oxide to a preset temperature of 750 ℃;
mixing the pretreated oil-based drilling cuttings and the preheated calcium oxide in a mixing device according to a mass ratio of 1:1.5 to obtain a mixed raw material;
feeding the mixed raw materials into a feeding device with a sealing arrangement, and feeding the mixed raw materials into a moving bed pyrolysis furnace through the feeding device to perform pyrolysis reaction, wherein the temperature of the pyrolysis reaction is about 300 ℃, and the reaction time is 1 h;
directly feeding pyrolysis solid residues generated by the pyrolysis reaction into a baking-free brick manufacturing device to produce baking-free bricks; oil gas generated by pyrolysis reaction is subjected to oil-gas separation in a condensation separation device, pyrolysis oil is recycled, and pyrolysis gas (non-condensable gas) is introduced into a gas heating zone provided with a heat accumulating type gas radiation pipe of the moving bed pyrolysis furnace to be combusted and used as fuel supplement;
high-temperature flue gas coming out of the moving bed pyrolysis furnace is used for generating steam through a waste heat boiler, the cooled low-temperature flue gas enters a heat accumulating type heat exchanger to directly exchange heat with air, and the flue gas after heat exchange and cooling is directly discharged through a chimney after further dedusting, desulfurization and denitrification.
The invention solves the problem of odor (stink) in the treatment process of the oil-based drilling cuttings by utilizing the sulfur fixation effect of the calcium oxide, can obviously improve the environmental odor, meets the environment-friendly treatment requirement of solid hazardous waste, and can effectively reduce the investment and the occupied area; in addition, the invention leads the non-condensable gas after the pyrolysis oil gas is condensed and separated into the heat accumulating type fuel gas radiant tube of the moving bed pyrolysis furnace, thereby improving the energy utilization rate and reducing the equipment investment cost.
In conclusion, the treatment process of the process provided by the invention is clean and energy-saving, has no pollutant discharge and low environmental odor, and can realize the high-efficiency treatment of the oil-based drilling cuttings; the system is easy to operate, the equipment runs stably and reliably, the heat efficiency of the whole system is high, the running cost is low, and the economic benefit is high.
The above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, so that the invention is intended to cover all modifications and equivalents of the embodiments described herein. In addition, the technical features and the technical inventions of the present invention, the technical features and the technical inventions, and the technical inventions can be freely combined and used.
Claims (10)
1. The process for mixing and treating the oil-based drill cuttings and the calcium oxide is characterized by comprising the following steps of:
(1) mixing the pretreated oil-based drilling cuttings and the preheated calcium oxide to obtain a mixture;
(2) pyrolyzing the mixture to obtain pyrolysis oil gas, high-temperature flue gas and pyrolysis solid residues;
(3) and condensing and separating the pyrolysis oil gas to obtain pyrolysis oil and non-condensable gas.
2. The process of claim 1, further comprising: and manufacturing the baking-free brick by utilizing the pyrolysis solid residue.
3. The process of claim 1, further comprising: and (3) using the non-condensable gas in the step (3) as fuel gas in the pyrolysis process in the step (2).
4. The process according to claim 1, further comprising passing the high temperature flue gas through heat exchangers of different stages in sequence and exchanging heat in sequence.
5. The process according to claim 4, further comprising exchanging heat of the high-temperature flue gas by a waste heat boiler to obtain low-temperature flue gas, and then exchanging heat of the low-temperature flue gas by a regenerative heat exchanger to obtain cooled flue gas.
6. The process according to claim 5, further comprising discharging the cooled flue gas after dedusting by a deduster.
7. The process according to claim 6, further comprising discharging the cooled flue gas after being dedusted by the deduster in a desulfurization and denitrification device after desulfurization and denitrification treatment.
8. The process of claim 1 further comprising metering the batch prior to pyrolyzing it.
9. The process according to claim 1, wherein the pyrolysis is carried out in a moving bed pyrolysis furnace, the moving bed pyrolysis furnace is a pyrolysis furnace with an annular sealing structure and comprises a gas heating zone and an inner material pyrolysis zone, and the gas heating zone is provided with a regenerative gas radiant tube.
10. The process according to any one of claims 1 to 9, wherein the temperature of the preheated calcium oxide is 750 ℃;
the mass ratio of the pretreated oil-based drilling cuttings to the preheated calcium oxide is 1: 1.5;
the temperature of the pyrolysis reaction is 300 ℃, and the reaction time is 1 h.
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| CN113308266A (en) * | 2021-06-10 | 2021-08-27 | 镇江新区固废处置股份有限公司 | Oil-containing solid waste disposal system based on pyrolysis technology |
| CN114653729A (en) * | 2021-12-17 | 2022-06-24 | 中国科学院广州能源研究所 | Vacuum pyrolysis treatment and recovery method for retired fan blade |
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| CN112983319A (en) * | 2021-03-19 | 2021-06-18 | 西南石油大学 | Shale oil-based drilling cutting recycling device and method |
| CN113308266A (en) * | 2021-06-10 | 2021-08-27 | 镇江新区固废处置股份有限公司 | Oil-containing solid waste disposal system based on pyrolysis technology |
| CN114653729A (en) * | 2021-12-17 | 2022-06-24 | 中国科学院广州能源研究所 | Vacuum pyrolysis treatment and recovery method for retired fan blade |
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