Pyrolysis treatment system for oil-based drilling cuttings

Abstract

The utility model discloses a pyrolysis treatment system for oil-based drilling cuttings, which is characterized in that a spray tower is arranged in a pyrolysis device; the pretreatment device, the feeding screw conveyor, the rotary furnace, the discharging screw conveyor, the spray tower, the cooling device, the separation device and the gas purification device are connected in sequence and are connected with a gas inlet of the feeding screw conveyor through the gas purification device; the lower part of the separation device is connected with a connecting pipeline between the discharging screw conveyor and the spray tower through an oil conveying pipeline; and a delivery pump, a filter and a cooler are connected in series between the lower tower body and the upper tower body of the spray tower through pipelines. According to the utility model, while the spray tower is adopted to replace a cyclone filter in an original pyrolysis device, a large amount of gas and moisture existing in a treated material are fully considered and utilized as spray liquid of the spray tower; and meanwhile, the oil product separated by the separation device and the condensate in the spray tower are effectively utilized as spray liquid, so that the treatment cost of the oil-based drilling cuttings is greatly reduced.

Description

Technical Field

[0001] The utility model relates to processing equipment for oil-containing solid drill cuttings in the petroleum industry, in particular to a pyrolysis processing system for oil-based drill cuttings. Background Art

[0002] Oil-based drill cuttings are solid waste produced during the oil drilling process through the contact between drilling fluid and formation rock. Oil-based drilling fluid is a petroleum-based drilling fluid system used to cool the drill bit, lubricate and suspend drill cuttings and maintain formation stability during drilling.

[0003] When the drilling fluid comes into contact with the formation, it will carry the formation rock fragments, which will return to the ground with the drilling fluid to form oil-based drill cuttings. The composition of oil-based drill cuttings is complex, including oils (such as diesel, white oil, etc.), rock minerals, emulsifiers, wetting agents, weighting agents, etc., which contain a large number of toxic and harmful substances that are difficult to degrade, such as sulfides, benzene series, phenols, anthracene, pyrene, etc. Pyrolysis is one of the main methods for treating oil-based drill cuttings. This method is to send the oil-based drill cuttings into a rotary kiln, heat it outside the rotary kiln, and use indirect heating to heat and decompose the oil-based drill cuttings under high temperature and oxygen-deficient conditions, and finally become combustible gas, oil, solid carbon, etc.

[0004] At present, there are many oil-based drill cuttings pyrolysis treatment systems, but the pyrolysis devices in them use cyclone filters to remove impurities (CO, CO2, H2S, CH4, etc.) in the gas circulation system, but the effect is not good. The reason is that after the rotary kiln in the pyrolysis device undergoes high-temperature cracking, its products contain some low-density ash, which is easily carried by the gas and collides with pipelines and equipment during transportation to form powdered fly ash, which is adsorbed on the heat exchange tubes of the heat exchanger in the rotary kiln, resulting in poor separation effect of the cyclone filter on impurities and poor heat exchange effect, which seriously affects the operation of the gas circulation device.

[0005] After searching, there are the following related patent technologies:

[0006] Chinese patent authorization announcement number CN209522807U discloses a solid waste pyrolysis treatment device, which relates to the field of waste treatment technology. The device includes a high-temperature rotary furnace, a cyclone separator, a first-stage heat exchanger tube, a second-stage cooler, a three-phase separator, a circulating fan, a first-stage heat exchanger shell, a first heater and a second heater connected in sequence, and the outlet of the second heater is connected to the high-temperature rotary furnace; the device also includes a low-temperature rotary furnace whose outlet and inlet are respectively connected to the cyclone separator and the first heating furnace. The device is provided with low- and high-temperature rotary furnaces to perform pyrolysis treatment on the solid waste, so that the low-boiling point substances in the solid waste are first pyrolyzed and separated at low temperature, and the high-boiling point substances are pyrolyzed and separated at high temperature, which shortens the treatment time of the solid waste at high temperature, avoids the high-boiling point substances in the solid waste from staying at high temperature for a long time and excessive pyrolysis and coking, thereby improving the liquid yield of the solid waste pyrolysis.

[0007] The above utility model is provided with a low-temperature and a high-temperature rotary kiln to perform pyrolysis treatment on solid waste, so that low-boiling-point substances in the solid waste are first pyrolyzed and separated at low temperature, and high-boiling-point substances are pyrolyzed and separated at high temperature. It includes a three-phase separator and a circulating fan, and a cyclone filter is provided to remove impurities in the gas circulation device. However, since the product after high-temperature cracking in the rotary kiln contains some ash, these ashes are easily carried by the gas and adsorbed on the heat exchange tubes in the heater in the rotary kiln, resulting in a poor separation effect of the cyclone filter.

[0008] Chinese patent authorization announcement number CN214660077U discloses an oil-based drill cuttings processing device, which includes: a pyrolysis unit, the pyrolysis unit is used for thermal desorption of oil-based drill cuttings; and a condensation unit, which is used to condense the oil and gas generated by the thermal desorption; the concentrated brine obtained after the reverse osmosis treatment of the reverse effluent is used as the cold source of the condensation unit. The above utility model uses the concentrated brine obtained after the reverse effluent treatment as the cold source of the condensation unit, so that while condensing the oil and gas generated by the thermal desorption, the concentrated brine is heated to form crystalline salt, which reduces the cost of subsequent treatment of the concentrated brine and reduces energy consumption.

[0009] However, the pyrolysis unit in the above utility model is connected to the oil and gas outlet of the cooling unit. If the gas carries impurities, the condensation effect will be poor.

[0010] The pyrolysis treatment device of oil-based drill cuttings still needs to be improved. Summary of the invention

[0011] The utility model aims to provide a pyrolysis treatment system for oil-based drill cuttings, improve the pyrolysis device therein, replace the cyclone filter therein with a spray tower, enhance the ability of the pyrolysis device to remove impurities, and improve the treatment effect of the entire pyrolysis treatment system on oil-based drill cuttings.

[0012] The utility model adopts the following technical scheme: a pyrolysis treatment system for oil-based drill cuttings, which is provided with a pretreatment device, a pyrolysis device, a cooling device, a separation device and a gas purification device; the pyrolysis device is provided with a feeding screw conveyor, a rotary kiln and a discharging screw conveyor, wherein: the pyrolysis device is also provided with a spray tower; the pretreatment device, the feeding screw conveyor, the rotary kiln, the discharging screw conveyor, the spray tower, the cooling device, the separation device and the gas purification device are connected in sequence and connected to the air inlet of the feeding screw conveyor through the gas purification device.

[0013] Preferably, a circulating fan and a gas heater are connected in series between the gas purification device and the air inlet of the feed screw conveyor.

[0014] A pyrolysis treatment system for oil-based drill cuttings is provided with a pretreatment device, a pyrolysis device, a cooling device, a separation device and a gas purification device. The pyrolysis device is provided with a feeding screw conveyor, a rotary kiln and a discharging screw conveyor, wherein: the pyrolysis device is also provided with a spray tower; the pretreatment device, the feeding screw conveyor, the rotary kiln, the discharging screw conveyor, the spray tower, the cooling device, the separation device and the gas purification device are connected in sequence and connected to the air inlet of the feeding screw conveyor through the gas purification device; the lower part of the separation device is connected to the connecting pipeline between the discharging screw conveyor and the spray tower through an oil pipeline.

[0015] Preferably, a circulating fan and a gas heater are connected in series between the gas purification device and the air inlet of the feed screw conveyor.

[0016] Preferably, a three-way pipe and an oil quantity control distribution valve are installed at the lower part of the separation device, and the oil quantity control distribution valve is installed in both pipe openings of the three-way pipe.

[0017] A pyrolysis treatment system for oil-based drill cuttings is provided with a pretreatment device, a pyrolysis device, a cooling device, a separation device and a gas purification device. The pyrolysis device is provided with a feed screw conveyor, a rotary kiln and a discharge screw conveyor, wherein: the pyrolysis device is also provided with a spray tower; the pretreatment device, the feed screw conveyor, the rotary kiln, the discharge screw conveyor, the spray tower, the cooling device, the separation device and the gas purification device are connected in sequence and connected to the air inlet of the feed screw conveyor through the gas purification device; the lower part of the separation device is connected to the connecting pipeline between the discharge screw conveyor and the spray tower through an oil pipeline; a delivery pump, a filter and a cooler are connected in series between the lower tower body and the upper tower body of the spray tower through a pipeline.

[0018] Preferably, a circulating fan and a gas heater are connected in series between the gas purification device and the air inlet of the feed screw conveyor.

[0019] Preferably, a three-way pipe and an oil quantity control distribution valve are installed at the lower part of the separation device, and the oil quantity control distribution valve is installed in both pipe openings of the three-way pipe.

[0020] Preferably, the cooling device installed between the spray tower and the separation device includes a primary cooling device and a secondary cooling device, and the primary cooling device and the secondary cooling device are connected in series between the spray tower and the separation device.

[0021] Compared with the prior art, the utility model has a significant use effect: in the utility model, the cyclone filter in the pyrolysis device is replaced with a spray tower, and the fly ash carried in the gas is removed by the spray tower, thereby avoiding the problem of scaling of the heat exchanger in the pyrolysis device affecting the heat exchange, which is beneficial to the stable operation of the pyrolysis device and improves the pyrolysis treatment effect of the system.

[0022] This system feeds the pre-treated oil-based drill cuttings into the rotary kiln through the feed screw conveyor, and the residue after the reaction is sent out of the rotary kiln through the discharge screw conveyor. Because the rotary kiln is a place for thermal cracking, the oil-based drill cuttings are cracked here to produce a large amount of gas. These gases carry ash into the spray tower. The spray tower uses liquid to wash the fly ash to prevent the fly ash in the gas from entering the cooling device and affecting the heat exchange effect. The separation device further separates the condensed products into gas, oil, and water, of which oil and water can be transported out as products, while the gas continues to participate in the circulation. In the gas purification device, the gas is purified again and enters the circulation fan and gas heater. The gas is heated and then sent back to the rotary kiln.

[0023] In this pyrolysis treatment system, while using a spray tower to replace the cyclone filter in the original pyrolysis device, full consideration is given to and utilization of a large amount of gas and moisture in the treated material as spray liquid for the spray tower; at the same time, the oil separated by the separation device and the condensate in the spray tower are also effectively utilized as spray liquid, which greatly reduces the treatment cost of oil-based drill cuttings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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:

[0025] Figure 1 It is a working principle diagram of the pyrolysis treatment system of oil-based drill cuttings;

[0026] Figure 2 yes Figure 1 A flow chart of a first embodiment of a pyrolysis treatment system for medium oil-based drill cuttings;

[0027] Figure 3 yes Figure 1A flow chart of a second embodiment of a pyrolysis treatment system for medium oil-based drill cuttings;

[0028] Figure 4 yes Figure 1 A flow chart of a third embodiment of a system for pyrolysis treatment of medium oil-based drill cuttings.

[0029] In the figure: pretreatment device 1; pyrolysis device 2, feed screw conveyor 2-1, rotary kiln 2-2, discharge screw conveyor 2-3, spray tower 2-4, conveying pump 2-5, filter 2-6, cooler 2-7; cooling device 3, primary cooling device 3-1, secondary cooling device 3-2; separation device 4, oil quantity control distribution valve 4-1; gas purification device 5, circulating fan 6, gas heater 7. DETAILED DESCRIPTION

[0030] The accompanying drawings are for reference and illustration only and are not intended to limit the scope of protection of the present utility model. The technical solutions in the embodiments of the present utility model will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present utility model.

[0031] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0032] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, in the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0033] The utility model has three implementation modes

[0034] First Implementation Method

[0035] See also Figure 1 and Figure 2A pyrolysis treatment system for oil-based drill cuttings is provided with a pretreatment device 1, a pyrolysis device 2, a cooling device 3, a separation device 4 and a gas purification device 5. The pyrolysis device 2 is provided with a feeding screw conveyor 2-1, a rotary kiln 2-2 and a discharging screw conveyor 2-3, wherein: the pyrolysis device 2 is also provided with a spray tower 2-4; the pretreatment device 1, the feeding screw conveyor 2-1, the rotary kiln 2-2, the discharging screw conveyor 2-3, the spray tower 2-4, the cooling device 3, the separation device 4 and the gas purification device 5 are connected in sequence and connected to the air inlet of the feeding screw conveyor 2-1 through the gas purification device 5.

[0036] In the utility model, the cyclone filter in the pyrolysis device 2 is replaced by a spray tower 2-4. The oil-based drill cuttings enter from the feed port of the pretreatment device 1, and the lumps with a particle size greater than 30 mm in the oil-based drill cuttings are first removed or crushed in the pretreatment device 1. The pretreated oil-based drill cuttings are then sent to the rotary kiln 2-2 for pyrolysis treatment through the feed screw conveyor 2-1, and the treated material is output by the discharge screw conveyor 2-3. The solid residue treated by the pyrolysis device 2 is discharged from the discharge port of the discharge screw conveyor 2-3, and the gas and ash generated by the material treatment enter the spray tower 2-4 from the gas outlet of the discharge screw conveyor 2-3 and are successively treated by the cooling device 3, the separation device 4 and the gas purification device 5 before entering from the air inlet of the feed screw conveyor 2-1, forming a loop with the pyrolysis device 2;

[0037] After the spray tower 2-4 sprays the gas and ash, the dirt therein settles at the bottom of the spray tower 2-4. The preliminarily purified gas is further separated and purified by the cooling device 3, the separation device 4 and the gas purification device 5, and then sent to the feed screw conveyor 2-1, forming a virtuous cycle. The dirt settled in the spray tower 2-4 is discharged from the sewage outlet at the bottom of the tower body.

[0038] The water and oil separated by the separation device 4 are discharged from the bottom and can be discharged through pipelines to containers or pipe networks that can be processed and utilized.

[0039] Based on the above embodiment 1, the utility model also has the following embodiments:

[0040] A preferred embodiment: a circulating fan 6 and a gas heater 7 are connected in series between the gas purification device 5 and the air inlet of the feed screw conveyor 2-1. The additional circulating fan 6 can increase the circulation speed of the treated gas, and the gas purified by the gas purification device 5 is then sent to the gas heater 7 for heating, thereby improving the pyrolysis efficiency and effect of the pyrolysis device 2.

[0041] Second implementation method

[0042] See also Figure 1 and Figure 3A pyrolysis treatment system for oil-based drill cuttings is provided with a pretreatment device 1, a pyrolysis device 2, a cooling device 3, a separation device 4 and a gas purification device 5. The pyrolysis device 2 is provided with a feeding screw conveyor 2-1, a rotary kiln 2-2 and a discharging screw conveyor 2-3, wherein: the pyrolysis device 2 is also provided with a spray tower 2-4; the pretreatment device 1, the feeding screw conveyor 2-1, the rotary kiln 2-2, the discharging screw conveyor 2-3, the spray tower 2-4, the cooling device 3, the separation device 4 and the gas purification device 5 are connected in sequence and connected to the air inlet of the feeding screw conveyor 2-1 through the gas purification device 5; the lower part of the separation device 4 is connected to the connecting pipeline between the discharging screw conveyor 2-3 and the spray tower 2-4 through an oil pipeline.

[0043] In the utility model, the cyclone filter in the pyrolysis device 2 is replaced by a spray tower 2-4. The oil-based drill cuttings enter from the feed port of the pretreatment device 1, and the lumps with a particle size greater than 30 mm in the oil-based drill cuttings are first removed or crushed in the pretreatment device 1. The pretreated oil-based drill cuttings are then sent to the rotary kiln 2-2 for pyrolysis treatment through the feed screw conveyor 2-1, and the treated material is output by the discharge screw conveyor 2-3. The solid residue treated by the pyrolysis device 2 is discharged from the discharge port of the discharge screw conveyor 2-3, and the gas and ash generated by the material treatment enter the spray tower 2-4 from the gas outlet of the discharge screw conveyor 2-3 and are successively treated by the cooling device 3, the separation device 4 and the gas purification device 5 before entering from the air inlet of the feed screw conveyor 2-1, forming a loop with the pyrolysis device 2;

[0044] After the spray tower 2-4 sprays the gas and ash, the dirt therein settles at the bottom of the spray tower 2-4. The preliminarily purified gas is further separated and purified by the cooling device 3, the separation device 4 and the gas purification device 5, and then sent to the feed screw conveyor 2-1, forming a virtuous cycle. The dirt settled in the spray tower 2-4 is discharged from the sewage outlet at the bottom of the tower body.

[0045] The water separated by the separation device 4 is discharged from the bottom and discharged into a container or a pipeline network that can be processed and utilized through a pipeline; and the oil located at the lower part after separation by the separation device 4 is transported to the connecting pipeline between the discharge screw conveyor 2-3 and the spray tower 2-4 through the oil pipeline and enters the spray tower 2-4 here to participate in the spraying operation, which can reduce the use of spraying water provided from the outside to the spray tower 2-4, make full use of the separated oil, and save water resources.

[0046] Based on the above embodiment 1, the utility model also has the following embodiments:

[0047] A preferred embodiment: a circulating fan 6 and a gas heater 7 are connected in series between the gas purification device 5 and the air inlet of the feed screw conveyor 2-1. The additional circulating fan 6 can increase the circulation speed of the treated gas, and the gas purified by the gas purification device 5 is then sent to the gas heater 7 for heating, thereby improving the pyrolysis efficiency and effect of the pyrolysis device 2.

[0048] A preferred embodiment: A three-way pipe and an oil quantity control distribution valve 4-1 are installed at the lower part of the separation device 4, and the oil quantity control distribution valve 4-1 is installed at both pipe openings of the three-way pipe. In order to reasonably use the separated oil and reasonably distribute the amount of oil entering the spray tower 2-4, and to ensure the safety and normal operation of the utility model, a three-way pipe is installed at the lower part of the separation device 4 and an oil quantity control distribution valve 4-1 is installed at both pipe openings of the three-way pipe, so that a part of the oil enters the spray tower 2-4 to participate in the spraying operation, and the other part of the oil is transported and recycled through the three-way pipe. The amount of oil transported through the two pipe openings of the three-way pipe can be controlled by the oil quantity control distribution valve 4-1 installed respectively.

[0049] The third implementation method

[0050] See also Figure 1 and Figure 4 A pyrolysis treatment system for oil-based drill cuttings is provided with a pretreatment device 1, a pyrolysis device 2, a cooling device 3, a separation device 4 and a gas purification device 5. The pyrolysis device 2 is provided with a feeding screw conveyor 2-1, a rotary kiln 2-2 and a discharging screw conveyor 2-3, wherein: a spray tower 2-4 is also provided in the pyrolysis device 2; the pretreatment device 1, the feeding screw conveyor 2-1, the rotary kiln 2-2, the discharging screw conveyor 2-3, the spray tower 2-4, the cooling device 3, the separation device 4 and the gas purification device 5 are connected in sequence and connected to the air inlet of the feeding screw conveyor 2-1 through the gas purification device 5; the lower part of the separation device 4 is connected to the connecting pipeline between the discharging screw conveyor 2-3 and the spray tower 2-4 through an oil pipeline; the lower tower body and the upper tower body of the spray tower 2-4 are connected in series with a delivery pump 2-5, a filter 2-6 and a cooler 2-7 through a pipeline.

[0051] In the utility model, the cyclone filter in the pyrolysis device 2 is replaced by a spray tower 2-4. The oil-based drill cuttings enter from the feed port of the pretreatment device 1, and the lumps with a particle size greater than 30 mm in the oil-based drill cuttings are first removed or crushed in the pretreatment device 1. The pretreated oil-based drill cuttings are then sent to the rotary kiln 2-2 for pyrolysis treatment through the feed screw conveyor 2-1, and the treated material is output by the discharge screw conveyor 2-3. The solid residue treated by the pyrolysis device 2 is discharged from the discharge port of the discharge screw conveyor 2-3, and the gas and ash generated by the material treatment enter the spray tower 2-4 from the gas outlet of the discharge screw conveyor 2-3 and are successively treated by the cooling device 3, the separation device 4 and the gas purification device 5 before entering from the air inlet of the feed screw conveyor 2-1, forming a loop with the pyrolysis device 2;

[0052] After the spray tower 2-4 sprays the gas and ash, the dirt therein settles at the bottom of the spray tower 2-4. The preliminarily purified gas is further separated and purified by the cooling device 3, the separation device 4 and the gas purification device 5, and then sent to the feed screw conveyor 2-1, forming a virtuous cycle. The dirt settled in the spray tower 2-4 is discharged from the sewage outlet at the bottom of the tower body.

[0053] The water separated by the separation device 4 is discharged from the bottom and discharged into a container or a pipeline network that can be processed and utilized through a pipeline; and the oil located at the lower part after separation by the separation device 4 is transported to the connecting pipeline between the discharge screw conveyor 2-3 and the spray tower 2-4 through the oil pipeline and enters the spray tower 2-4 here to participate in the spraying operation, which can reduce the use of spraying water provided from the outside to the spray tower 2-4, make full use of the separated oil, and save water resources.

[0054] In the present utility model, if Figure 4 As shown, in order to make full use of the condensate at the bottom of the spray tower 2-4, that is, the liquid condensed after the spraying operation, the condensate is also used as the spraying liquid of the spray tower 2-4, and the waste liquid is reused, which can further reduce the amount of liquid used for the spraying operation provided to the spray tower 2-4. The oil separated by the separation device 4 and the condensate of the spray tower 2-4 are used as the spraying liquid, which can further reduce the processing cost of oil-based drill cuttings. The spray tower 2-4 is equipped with a liquid circulation mechanism, including a delivery pump 2-5, a filter 2-6 and a cooler 2-7 connected in sequence, wherein the inlet of the delivery pump 2-5 is connected to the bottom of the spray tower 2-4, and is used to deliver the condensate at the bottom of the spray tower 2-4 as the spraying liquid, and the filter 2-6 and the cooler 2-7 filter and cool the liquid delivered by the delivery pump 2-5 respectively.

[0055] Of course, the high-boiling point components in the oil products are prone to coking under high temperature conditions for a long time. For this reason, part of the condensate in the spray tower 2-4 can be used as liquid feed for spraying. At the same time, part of the liquid in the spray tower 2-4 is input from the outside, thereby continuously replacing the liquid in the spray tower 2-4.

[0056] Based on the above embodiment 1, the utility model also has the following embodiments:

[0057] A preferred embodiment: a circulating fan 6 and a gas heater 7 are connected in series between the gas purification device 5 and the air inlet of the feed screw conveyor 2-1. The circulating fan 6 is added to increase the circulation speed of the treated gas, and the gas purified by the gas purification device 5 is then sent to the gas heater 7 for heating, thereby improving the pyrolysis efficiency and effect of the pyrolysis device 2.

[0058] A preferred embodiment: A three-way pipe and an oil quantity control distribution valve 4-1 are installed at the lower part of the separation device 4, and the oil quantity control distribution valve 4-1 is installed at both pipe openings of the three-way pipe. In order to reasonably use the separated oil and reasonably distribute the amount of oil entering the spray tower 2-4, and to ensure the safety and normal operation of the utility model, a three-way pipe is installed at the lower part of the separation device 4 and an oil quantity control distribution valve 4-1 is installed at both pipe openings of the three-way pipe, so that a part of the oil enters the spray tower 2-4 to participate in the spraying operation, and the other part of the oil is transported and recycled through the three-way pipe. The amount of oil transported through the two pipe openings of the three-way pipe can be controlled by the oil quantity control distribution valve 4-1 installed respectively.

[0059] A preferred embodiment: the cooling device 3 installed between the spray tower 2-4 and the separation device 4 includes a primary cooling device 3-1 and a secondary cooling device 3-2, and the primary cooling device 3-1 and the secondary cooling device 3-2 are connected in series between the spray tower 2-4 and the separation device 4. Setting the cooling device 3 as a secondary device can enhance the cooling effect of the output gas of the spray tower 2-4, which is beneficial to the separation of oil, gas and water in the separation device 4, and is also beneficial to the purification effect of the gas purification device 5.

[0060] The embodiments described above are only typical embodiments, but the utility model is not limited to these embodiments, and those skilled in the art can make modifications without departing from the spirit and enlightenment of the utility model. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to replace some of the technical features therein by equivalents. Any modifications, equivalent replacements, improvements, etc. made within the creative spirit and creative concept of the utility model should be included in the protection scope of the utility model. Therefore, the protection scope is not limited to the above description.

Claims

1. A pyrolysis treatment system for oil-based drill cuttings, comprising a pretreatment device, a pyrolysis device, a cooling device, a separation device and a gas purification device, wherein the pyrolysis device is provided with a feed screw conveyor, a rotary kiln and a discharge screw conveyor, and wherein: The pyrolysis device is also provided with a spray tower; the pretreatment device, the feed screw conveyor, the rotary kiln, the discharge screw conveyor, the spray tower, the cooling device, the separation device and the gas purification device are connected in sequence and connected to the air inlet of the feed screw conveyor through the gas purification device.

2. A pyrolysis treatment system for oil-based drill cuttings as claimed in claim 1, characterized in that: A circulating fan and a gas heater are also connected in series between the gas purification device and the air inlet of the feeding screw conveyor.

3. A pyrolysis treatment system for oil-based drill cuttings, comprising a pretreatment device, a pyrolysis device, a cooling device, a separation device and a gas purification device, wherein the pyrolysis device is provided with a feed screw conveyor, a rotary kiln and a discharge screw conveyor, and wherein: A spray tower is also provided in the pyrolysis device; a pretreatment device, a feed screw conveyor, a rotary kiln, a discharge screw conveyor, a spray tower, a cooling device, a separation device and a gas purification device are connected in sequence and connected to the air inlet of the feed screw conveyor through the gas purification device; the lower part of the separation device is connected to the connecting pipeline between the discharge screw conveyor and the spray tower through an oil pipeline.

4. A pyrolysis treatment system for oil-based drill cuttings as claimed in claim 3, characterized in that: A circulating fan and a gas heater are also connected in series between the gas purification device and the air inlet of the feeding screw conveyor.

5. A pyrolysis treatment system for oil-based drill cuttings as claimed in claim 3, characterized in that A three-way pipe and an oil quantity control distribution valve are arranged at the lower part of the separation device, and the oil quantity control distribution valve is installed in both pipe openings of the three-way pipe.

6. A pyrolysis treatment system for oil-based drill cuttings, comprising a pretreatment device, a pyrolysis device, a cooling device, a separation device and a gas purification device, wherein the pyrolysis device is provided with a feed screw conveyor, a rotary kiln and a discharge screw conveyor, and wherein: A spray tower is also provided in the pyrolysis device; a pretreatment device, a feed screw conveyor, a rotary kiln, a discharge screw conveyor, a spray tower, a cooling device, a separation device and a gas purification device are connected in sequence and connected to the air inlet of the feed screw conveyor through the gas purification device; the lower part of the separation device is connected to the connecting pipeline between the discharge screw conveyor and the spray tower through an oil pipeline; a delivery pump, a filter and a cooler are connected in series between the lower tower body and the upper tower body of the spray tower through a pipeline.

7. A pyrolysis treatment system for oil-based drill cuttings as claimed in claim 6, characterized in that: A circulating fan and a gas heater are also connected in series between the gas purification device and the air inlet of the feeding screw conveyor.

8. A pyrolysis treatment system for oil-based drill cuttings as claimed in claim 6, characterized in that A three-way pipe and an oil quantity control distribution valve are arranged at the lower part of the separation device, and the oil quantity control distribution valve is installed in both pipe openings of the three-way pipe.

9. A pyrolysis treatment system for oil-based drill cuttings as claimed in claim 6, characterized in that: The cooling device installed between the spray tower and the separation device comprises a primary cooling device and a secondary cooling device, and the primary cooling device and the secondary cooling device are connected in series between the spray tower and the separation device.

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