CN113173688A - Pyrolysis recovery system and method for oily sludge - Google Patents
Pyrolysis recovery system and method for oily sludge Download PDFInfo
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- CN113173688A CN113173688A CN202110504880.6A CN202110504880A CN113173688A CN 113173688 A CN113173688 A CN 113173688A CN 202110504880 A CN202110504880 A CN 202110504880A CN 113173688 A CN113173688 A CN 113173688A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/40—Valorisation of by-products of wastewater, sewage or sludge processing
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Abstract
The application discloses a pyrolysis recovery system for oily sludge, which comprises a preheater, a frying dryer, a pyrolysis furnace, a waste heat utilization boiler, a primary oil spray cooler and a secondary water spray cooler, wherein the pyrolysis furnace is used for pyrolyzing dry oil sludge into pyrolysis residues and pyrolysis gas, the waste heat utilization boiler is used for heating water into steam by utilizing the pyrolysis gas and transmitting the cooled pyrolysis gas to the primary oil spray cooler for continuous cooling, the obtained high-boiling-point recovered oil is continuously cooled to form normal-temperature high-boiling-point recovered oil, and the secondary water spray cooler is used for forming low-boiling-point recovered oil; wherein, the one-level oil sprays the cooler and still communicates to the fried desicator in order to the fried desicator in input high boiling recovery oil, this system can reduce the drying energy consumption of oiliness mud, carries out the step recycle to high temperature pyrolysis gas waste heat, and the energy efficiency and the economic nature of resource utilization are improved to the oil gas resource classification recovery in the pyrolysis gas to oiliness mud pyrolysis. The application also discloses a pyrolysis recovery method of the oily sludge.
Description
Technical Field
The invention belongs to the technical field of petroleum treatment equipment, and particularly relates to a pyrolysis recovery system and method for oily sludge.
Background
With the rapid development of the petroleum industry, a large amount of oily sludge is generated in the processes of oil-gas field exploration, development, petroleum refining, crude oil storage and gathering and transportation, the oil field sludge comprises oil sludge falling to the ground, clear tank oil sludge sand, oil sludge in underground operation and oil sludge generated by an oil field extraction water treatment station, and the oil sludge generated by the oil field extraction water treatment station accounts for more than 75% of the total amount of the oil field sludge. The oily sludge is one of the important pollutions generated in the development process of petroleum enterprises, and the main hazards are land encroachment, soil pollution, water pollution and atmosphere pollution. At present, the total amount of oily sludge generated in China every year reaches more than 500 ten thousand tons, the water content in produced oil is higher and higher along with the fact that most oil fields enter the middle and later period exploitation stage, and the amount of the oily sludge can be increased continuously. The oily sludge has large water content change (generally the water content is 40-90 percent), high oil content (generally the oil content is 10-50 percent), relatively low solid content, and the solid size is generally micron-sized and exists in the form of suspended matters, so the oily sludge has large treatment difficulty, oil-water-solid three-phase separation is difficult to carry out through a common sedimentation process, and the oily sludge is subjected to high-temperature pyrolysis and the resources in the oily sludge are recovered, thereby being a universal treatment method.
The existing method for drying oily sludge, anaerobic pyrolysis and oil recovery utilizes pyrolysis gas with the temperature of 500-600 ℃ generated in a hearth of a pyrolysis furnace to enter a flash evaporation dryer and contact with the oily sludge for indirect heating and drying, and the cooled pyrolysis gas is subjected to oil gas resource recovery by adopting a washing method.
Disclosure of Invention
In order to solve the problems, the invention provides a pyrolysis recovery system and a pyrolysis recovery method for oily sludge, which can reduce the drying energy consumption of the oily sludge, carry out gradient recovery and utilization on the waste heat of high-temperature pyrolysis gas, carry out classified recovery on oil gas resources in the pyrolysis gas in a grading way, and improve the energy efficiency and the economical efficiency of the pyrolysis resource utilization of the oily sludge.
The invention provides a pyrolysis recovery system for oily sludge, which comprises a preheater, a frying dryer, a pyrolysis furnace, a waste heat utilization boiler, a primary oil spray cooler and a secondary water spray cooler which are sequentially connected, wherein the preheater is used for preheating the oily sludge, the frying dryer is used for frying and drying the preheated oily sludge to form dry oil sludge, the pyrolysis furnace is used for pyrolyzing the dry oil sludge to form pyrolysis residue and pyrolysis gas, the waste heat utilization boiler is used for heating high-pressure saturated water into high-pressure superheated steam by utilizing the pyrolysis gas and transmitting the cooled pyrolysis gas to the primary oil spray cooler for continuous cooling, the obtained high-boiling-point recovered oil is transmitted to an oil-water heat exchanger through a high-boiling-point recovered oil output pipeline for continuous cooling to form normal-temperature high-boiling-point recovered oil to be stored in a first storage tank, and the secondary water spray cooler is used for continuous cooling of non-condensable gas transmitted by the primary oil spray cooler, the oil-water separator connected with the cooling water separator is used for cooling and separating cooling water and low-boiling-point recovered oil stored in a second storage tank again;
the primary oil spray cooler is communicated to the frying dryer through the high-boiling-point recovered oil output pipeline so as to input high-boiling-point recovered oil into the frying dryer.
Preferably, in the pyrolysis recovery system for oily sludge described above, the fry-dryer is further connected to the preheater with a steam passage to supply steam to the preheater to supply heat required for preheating.
Preferably, in the pyrolysis recovery system for oily sludge, the pyrolysis recovery system further comprises a combustion device connected with the pyrolysis furnace, wherein the combustion device is used for combusting pyrolysis residues generated by the pyrolysis furnace and transmitting high-temperature flue gas generated by combustion back to the pyrolysis furnace to provide heat.
Preferably, in the pyrolysis recovery system for oil-containing sludge, a cooling water pipeline is further connected between the secondary water spray cooler and the oil-water separator.
Preferably, in the pyrolysis recovery system for oily sludge, a water supply pipeline is further provided between the oil-water heat exchanger and the waste heat utilization boiler, and is used for supplying saturated water heated by the oil-water heat exchanger to the waste heat utilization boiler.
Preferably, in the pyrolysis recovery system for oily sludge as described above, the combustion apparatus has an air inlet port for controlling the flow rate of the intake air to control the combustion manner and a combustion ash discharge port, the air inlet port is configured to increase the flow rate of the intake air to control the combustion manner of the pyrolysis residue to be complete combustion when the pyrolysis temperature is higher than a preset temperature threshold, and to decrease the flow rate of the intake air to control the combustion manner of the pyrolysis residue to be incomplete combustion when the pyrolysis temperature is lower than the preset temperature threshold.
Preferably, in the pyrolysis recovery system for oil-containing sludge, a normal-temperature high-boiling-point recovered oil transmission pipeline is further connected between the first storage tank and the primary oil spray cooler, and is used for transmitting the normal-temperature high-boiling-point recovered oil to the primary oil spray cooler to cool the pyrolysis gas.
Preferably, in the pyrolysis recovery system for oily sludge, an outlet for discharging non-condensable gas is further provided laterally above the secondary water spray cooler.
The invention provides a pyrolysis recovery method of oily sludge, which comprises the following steps:
preheating the oily sludge by using high-temperature steam discharged by the oil-containing sludge frying and drying;
taking high-boiling-point recovered oil as a frying medium to fry and dry the preheated oily sludge to obtain dry oil sludge;
pyrolyzing the dry oil sludge to produce pyrolysis residue and pyrolysis gas;
utilizing heat in the pyrolysis gas, and converting high-pressure saturated water into high-pressure superheated steam;
after the temperature of the pyrolysis gas is reduced, carrying out primary oil spray cooling to obtain high-boiling-point recovered oil for storage;
and (4) carrying out secondary water spray cooling on the non-condensable gas generated after the primary oil spray cooling to obtain low-boiling-point recovered oil for storage.
Preferably, in the method for recovering oil-containing sludge by pyrolysis, the method further comprises:
and burning the pyrolysis residues, and providing heat for pyrolysis by using high-temperature flue gas generated by burning.
As can be seen from the above description, the pyrolysis recovery system for oily sludge provided by the invention comprises a preheater, a frying dryer, a pyrolysis furnace, a waste heat utilization boiler, a primary oil spray cooler and a secondary water spray cooler, which are sequentially connected, wherein the preheater is used for preheating the oily sludge, the frying dryer is used for frying and drying the preheated oily sludge to form dry oil sludge, the pyrolysis furnace is used for pyrolyzing the dry oil sludge to form pyrolysis residue and pyrolysis gas, the waste heat utilization boiler is used for heating high-pressure saturated water to form high-pressure superheated steam by using the pyrolysis gas and transmitting the cooled pyrolysis gas to the primary oil spray cooler for further cooling, the obtained high-boiling-point recovered oil is transmitted to an oil-water heat exchanger through a high-boiling-point recovered oil output pipeline for further cooling to form normal-temperature high-boiling-point recovered oil, and the normal-temperature high-boiling-point recovered oil is stored in a first storage tank, and the secondary water spray cooler is used for continuously cooling the non-condensable gas transmitted by the primary oil spray cooler Cooling and separating the cooling water and the low-boiling-point recovered oil stored in the second storage tank again by using the oil-water separator connected with the cooling water; the primary oil spray cooler is communicated to the frying dryer through the high-boiling-point recovered oil output pipeline so as to input high-boiling-point recovered oil into the frying dryer, so that the high-boiling-point recovered oil adopted in the frying dryer is generated by the primary oil spray cooler, the oil and energy are recycled, the drying energy consumption of oily sludge can be reduced, the high-temperature pyrolysis gas waste heat is recycled in a gradient manner, oil and gas resources in the pyrolysis gas are recycled in a classified manner, and the energy efficiency and the economical efficiency of the oily sludge pyrolysis resource utilization are improved. The method for pyrolyzing and recycling the oily sludge provided by the invention has the same advantages as the system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of an embodiment of a pyrolysis recovery system for oily sludge provided by the present invention;
FIG. 2 is a schematic diagram of an embodiment of a method for pyrolysis recovery of oily sludge according to the present invention.
Detailed Description
The core of the invention is to provide a pyrolysis recovery system and a pyrolysis recovery method for oily sludge, which can reduce the drying energy consumption of the oily sludge, carry out gradient recovery and utilization on the high-temperature pyrolysis gas waste heat, carry out classified recovery on oil gas resources in the pyrolysis gas in a grading way, and improve the energy efficiency and the economical efficiency of the pyrolysis resource utilization of the oily sludge.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of a pyrolysis recovery system for oily sludge according to the present invention is shown in fig. 1, and fig. 1 is a schematic diagram of an embodiment of a pyrolysis recovery system for oily sludge according to the present invention, where the pyrolysis recovery system for oily sludge may include a preheater 12, a frying dryer 2, a pyrolysis furnace 4, a waste heat utilization boiler 6, a primary oil spray cooler 8, and a secondary water spray cooler 10 connected in sequence, the preheater 12 is configured to preheat oily sludge 1A to be treated, and may be, but is not limited to, preheat to 60 ℃ to 80 ℃, condensed water 14 formed after preheating flows out from an outlet of the preheater, the frying dryer is configured to fry and dry the preheated oily sludge 1 to form dry oil sludge 3, a frying temperature may be, but is not limited to, 140 ℃ to 180 ℃, a pressure may be normal pressure, and a drying time may be 12 minutes to 15 minutes, drying to the water content of 3-5%, wherein the pyrolysis furnace 4 is used for pyrolyzing the dry oil sludge 3 into pyrolysis residue 28 and pyrolysis gas 5, the pyrolysis temperature can be but is not limited to 550-700 ℃, in order to avoid oil components in the pyrolysis gas condensing on the surface of a heat exchange tube, the outlet temperature of the pyrolysis furnace 4 can be but is not limited to 380-420 ℃, the waste heat utilization boiler 6 utilizes the pyrolysis gas 5 to heat high-pressure saturated water 16 entering the waste heat utilization boiler 6 into high-pressure superheated steam 17, the temperature of the high-pressure superheated steam 17 can be 400-500 ℃, the pressure can be 4-6 MPa, the high-pressure superheated steam can be stored for standby use, the effective utilization of heat is realized, the waste is avoided, the cooled pyrolysis gas 7 is transmitted to the primary oil spray cooler 8 to be continuously cooled, the temperature can be but is not limited to 220-250 ℃, at least one part of the high-boiling-point recovered oil 19 obtained by the primary oil spray cooler 8 can be recovered through the high-point recovered oil The output pipeline is transmitted to the oil-water heat exchanger 20 to be continuously cooled to form normal-temperature high-boiling-point recovered oil 22, the normal-temperature high-boiling-point recovered oil is stored in the first storage tank 31, it should be noted that the boiling point of the high-boiling-point recovered oil is higher than 250 ℃, in addition, the secondary water spray cooler 10 is used for continuously cooling the non-condensable gas 9 transmitted from the primary oil spray cooler 8, a cooling medium can be, but is not limited to, cooling water, the cooling temperature can be 40-50 ℃, and then the oil-water separator 23 connected with the secondary water spray cooler is used for cooling and separating the cooling water and the low-boiling-point recovered oil 25 stored in the second storage tank 32 again, so that the oil-containing components in the pyrolysis gas are primarily separated according to the difference of the boiling points, and the subsequent treatment cost of the recovered oil is reduced;
wherein, the primary oil spray cooler 8 is also communicated with the frying dryer 2 through the high boiling point recovered oil output pipeline so as to input the high boiling point recovered oil 21 into the frying dryer 2, for oil sludge with different oil contents and water contents, the proportion of the high boiling point recovered oil 21 entering the frying dryer to the total amount of the generated high boiling point recovered oil is 1/5-1/3, thus, the drying medium and the required energy are both from the high boiling point recovered oil separated from the pyrolysis gas, the drying speed is higher, the energy consumption is lower, thus, the heat energy and oil gas resources in the pyrolysis gas are recycled in a grading way, the high grade heat energy in the pyrolysis gas is fully utilized, the temperature of an oil pool is gradually reduced along with the evaporation of the water in the oil sludge in the drying process, and in order to maintain the frying temperature, the high boiling point recovered oil 21 continuously enters the frying dryer, at the same time, the same amount of the high boiling recovered oil flows out from the other side into the above-mentioned reservoir 31.
As can be seen from the above description, in the embodiment of the pyrolysis recovery system for oil-containing sludge provided by the present invention, the system includes a preheater, a frying dryer, a pyrolysis furnace, a waste heat utilization boiler, a primary oil spray cooler, and a secondary water spray cooler connected in sequence, the preheater is configured to preheat oil-containing sludge, the frying dryer is configured to fry and dry the preheated oil-containing sludge to form dry sludge, the pyrolysis furnace is configured to pyrolyze the dry sludge into pyrolysis residue and pyrolysis gas, the waste heat utilization boiler is configured to heat high-pressure saturated water into high-pressure superheated steam by using the pyrolysis gas and transmit the cooled pyrolysis gas to the primary oil spray cooler for further cooling, the obtained high-boiling-point recovered oil is transmitted to an oil-water heat exchanger through a high-boiling-point recovered oil output pipeline to form normal-temperature high-boiling-point recovered oil after being further cooled, the normal-temperature high-boiling-point recovered oil is stored in the first storage tank, the secondary water spray cooler is configured to further cool the non-condensable gas transmitted from the primary oil spray cooler, the oil-water separator connected with the cooling water separator is used for cooling and separating cooling water and low-boiling-point recovered oil stored in a second storage tank again; wherein, one-level oil spray cooler still communicates to the fried desicator through high boiling point recovery oil output pipeline in order to the fried desicator in input high boiling point recovery oil, thereby can see that the high boiling point recovery oil who adopts in the fried desicator is produced by one-level oil spray cooler, the recycle of oil and energy has been realized, thereby can reduce the drying energy consumption of oiliness mud, carry out step recycle to high temperature pyrolysis gas waste heat, classify the recovery to the oil gas resource in the pyrolysis gas in grades, the efficiency and the economic nature of oiliness mud pyrolysis utilization are improved.
In one embodiment of the pyrolysis recovery system for oily sludge described above, the fry-dryer 2 is also connected to the preheater 12 by means of a steam channel 13 to supply steam to the preheater 12 to provide the heat required for preheating. In the scheme, the temperature of the supplied water vapor can be 100-110 ℃, after the wet oil sludge is preheated, the water vapor can be cooled, but not limited to leave the preheater 12 after being cooled to 40-50 ℃, and then the water vapor can be recycled after the sewage treatment reaches the standard, and the preheating process is non-contact indirect heat exchange.
In another embodiment of the pyrolysis recovery system for oily sludge, the system further comprises a combustion device 27 connected with the pyrolysis furnace 4, wherein the combustion device 27 is used for combusting pyrolysis residues 28 generated by the pyrolysis furnace 4 and transmitting high-temperature flue gas 29 generated by the combustion back to the pyrolysis furnace 4 to provide heat. In this case, the heat of combustion of the pyrolysis residue can be used to provide the pyrolysis furnace with heat required for the pyrolysis process.
In another embodiment of the pyrolysis recovery system for oily sludge, a cooling water pipeline 26 is connected between the secondary water spray cooler 10 and the oil-water separator 23, so that the water separated by the oil-water separator 23 can be reused, thereby further saving the treatment cost.
On the basis of the embodiment of the pyrolysis recovery system for oily sludge, a water supply pipeline 16 may be further provided between the oil-water heat exchanger 20 and the waste heat utilization boiler 6, and is used for supplying saturated water heated by the oil-water heat exchanger 20 to the waste heat utilization boiler 6, wherein the supercooled water 15 is pressurized to 4MPa to 6MPa by a high-pressure water pump, enters the oil-water heat exchanger 20, is preheated to 140 ℃ to 150 ℃, and enters the waste heat utilization boiler 6. The non-condensable gas 9 enters a secondary water spray cooler 10, the entering temperature is 220-250 ℃, cooling water 26 introduced into an oil-water separator 23 is used as a cooling medium, the non-condensable gas 9 is sprayed into the secondary water spray cooler 10 from the upper portion, the non-condensable gas 9 is cooled to 25-30 ℃, condensable components in the non-condensable gas condense and fall into a recovery container at the lower portion of the secondary water spray cooler 10 together with the cooling water, the condensable components flow into the oil-water separator 23 from a lower portion outlet, the oil-water separation is carried out after the non-condensable gas is cooled to the normal temperature, low-boiling-point recovered oil 25 and the cooling water 26 are generated, the low-boiling-point recovered oil 25 enters a storage tank, and the cooling water 26 is recycled for later use.
Furthermore, the combustion apparatus 27 may have an air inlet 18 and a combustion ash discharge port 30, wherein the combustion temperature may reach 900 to 1000 degrees celsius, the temperature of the generated high-temperature flue gas is 900 to 1000 degrees celsius, the air inlet 18 is configured to increase the air inlet flow to control the combustion mode of the pyrolysis residue to be complete combustion when the pyrolysis temperature is higher than a preset temperature threshold, and decrease the air inlet flow to control the combustion mode of the pyrolysis residue to be incomplete combustion when the pyrolysis temperature is lower than the preset temperature threshold, the main product generated by the incomplete combustion is carbon monoxide, the heat value of the pyrolysis non-condensable gas can be adjusted, and the combustion ash 30 can be used as a soil modification material or a building material after being discharged.
In a preferred embodiment of the pyrolysis recovery system for oily sludge, a normal-temperature high-boiling-point recovered oil transmission pipeline 22 may be further connected between the first storage tank 31 and the primary oil spray cooler 8, and is used for transmitting the normal-temperature high-boiling-point recovered oil to the primary oil spray cooler 8 to cool the pyrolysis gas, so that the normal-temperature high-boiling-point recovered oil is further reused, and the treatment cost is further reduced.
In another preferred embodiment of the pyrolysis recovery system for oily sludge, an outlet 11 for discharging non-condensable gases is further provided laterally above the secondary water spray cooler 10. In this case, the non-condensable gases flow out of the outlet 11 laterally above the secondary water spray cooler 10 and may be conveyed outwards after collection or may be burnt in a combustion device.
To sum up, above-mentioned system can realize fatlute rapid draing to moisture content 3% to 5%, and drying time can be for 12 minutes to 15 minutes, and the required energy of drying is provided by high boiling point recovered oil, can also realize self-heating pyrolysis, and required energy is provided by the complete or incomplete burning of pyrolysis residue, can realize the fractional recycle of heat energy in the high temperature oily pyrolysis gas, realizes the categorised hierarchical recovery of oil simultaneously.
An embodiment of a method for recovering oily sludge by pyrolysis according to the present invention is shown in fig. 2, and fig. 2 is a schematic diagram of an embodiment of a method for recovering oily sludge by pyrolysis according to the present invention, and the method may include the following steps:
s1: preheating the oily sludge by using high-temperature steam discharged by the oil-containing sludge frying and drying;
it should be noted that the preheating may be, but is not limited to, 60 degrees celsius to 80 degrees celsius.
S2: taking high-boiling-point recovered oil as a frying medium to fry and dry the preheated oily sludge to obtain dry oil sludge;
the frying temperature may be, but is not limited to, 140 to 180 degrees celsius, the pressure may be normal pressure, the drying time may be 12 to 15 minutes, and the drying may be performed until the moisture content is 3 to 5%.
S3: pyrolyzing the dry oil sludge to generate pyrolysis residues and pyrolysis gas;
it should be noted that the temperature of pyrolysis may be, but is not limited to, 550 to 700 degrees celsius, and in order to avoid oil components in the pyrolysis gas from condensing on the surface of the heat exchange tube, the outlet temperature of the pyrolysis furnace may be, but is not limited to, 380 to 420 degrees celsius.
S4: utilizing heat in the pyrolysis gas, and converting high-pressure saturated water into high-pressure superheated steam;
it should be noted that the temperature of the high-pressure superheated steam may be 400 to 500 degrees celsius, and the pressure may be 4 to 6MPa, and the high-pressure superheated steam may be stored for use, so as to effectively utilize heat and avoid waste.
S5: reducing the temperature of the pyrolysis gas, and then spraying and cooling the first-grade oil to obtain high-boiling-point recovered oil for storage;
it should be noted that the boiling point of the high boiling point recovered oil described herein is greater than 250 degrees celsius, and may be, but is not limited to, cooling to 220 degrees celsius to 250 degrees celsius.
S6: and (4) carrying out secondary water spray cooling on the non-condensable gas generated after the primary oil spray cooling to obtain low-boiling-point recovered oil for storage.
It should be noted that the cooling medium may be, but is not limited to, cooling water, and the cooling temperature may be 40 to 50 degrees celsius, so that the oil-containing components in the pyrolysis gas are primarily separated according to the difference of boiling points, thereby reducing the subsequent treatment cost of the recovered oil.
In a specific embodiment of the method for recovering oil-containing sludge by pyrolysis, the method may further include:
and burning the pyrolysis residues, and providing heat for pyrolysis by using high-temperature flue gas generated by burning.
In this case, the heat of combustion of the pyrolysis residue can be used to provide the pyrolysis furnace with heat required for the pyrolysis process.
The fry-dryer may also be connected to the preheater with a steam channel to supply steam to the preheater to provide the heat required for preheating. In the scheme, the temperature of the supplied water vapor can be 100-110 ℃, after the wet oil sludge is preheated, the water vapor can be cooled, but not limited to leave the preheater 12 after being cooled to 40-50 ℃, and then the water vapor can be recycled after the sewage treatment reaches the standard, and the preheating process is non-contact indirect heat exchange.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a pyrolysis recovery system of oily sludge, its characterized in that, including preheater, fried desicator, pyrolysis oven, waste heat utilization boiler, one-level oil spray cooler and the second grade water spray cooler that connect gradually, the preheater is used for preheating oily sludge, fried desicator is used for forming dry fatlute to the oily sludge fried drying after preheating, the pyrolysis oven is used for with dry fatlute pyrolysis residue and pyrolysis gas, waste heat utilization boiler is used for utilizing pyrolysis gas heats high pressure saturated water into high pressure superheated steam and transmits the pyrolysis gas after will cooling to the one-level oil spray cooler continues to cool off, and the high boiling recovered oil that obtains forms normal atmospheric temperature high boiling point recovered oil after transmitting to oil water heat exchanger through high boiling point recovered oil output pipeline and continuing to cool off and save in first storage tank, second grade water spray cooler is used for continuing to cool off the noncondensable gas that first grade oil spray cooler transmitted, the oil-water separator connected with the cooling water separator is used for cooling and separating cooling water and low-boiling-point recovered oil stored in a second storage tank again;
the primary oil spray cooler is communicated to the frying dryer through the high-boiling-point recovered oil output pipeline so as to input high-boiling-point recovered oil into the frying dryer.
2. The system for pyrolytic recovery of oily sludge according to claim 1 wherein the fry-dryer is further connected to the preheater by means of a steam channel to supply steam to the preheater to provide the heat required for preheating.
3. The system for pyrolytic recovery of oily sludge according to claim 1 further comprising a combustion device connected to the pyrolysis furnace for burning the pyrolysis residue produced by the pyrolysis furnace and returning the high temperature flue gas produced by the combustion back to the pyrolysis furnace to provide heat.
4. The pyrolytic recovery system of oily sludge according to claim 1 wherein a cooling water pipeline is further connected between the secondary water spray cooler and the oil-water separator.
5. The pyrolysis recovery system of oily sludge according to claim 1, wherein a water supply pipeline is further provided between the oil-water heat exchanger and the waste heat utilization boiler, and is used for supplying saturated water heated by the oil-water heat exchanger into the waste heat utilization boiler.
6. The system for pyrolytic recovery of oily sludge according to claim 3 wherein the combustion apparatus has an air inlet port for controlling the flow of intake air to control the combustion pattern and a combustion ash discharge port, the air inlet port being adapted to increase the flow of intake air to control the combustion pattern of the pyrolytic residue to be complete combustion when the pyrolysis temperature is above a preset temperature threshold and to decrease the flow of intake air to control the combustion pattern of the pyrolytic residue to be incomplete combustion when the pyrolysis temperature is below the preset temperature threshold.
7. The system for pyrolysis recovery of oily sludge according to claim 1, wherein a normal temperature high boiling point recovered oil transmission pipeline is further connected between the first storage tank and the primary oil spray cooler, and is used for transmitting the normal temperature high boiling point recovered oil to the primary oil spray cooler to cool the pyrolysis gas.
8. The pyrolytic recovery system of oily sludge according to claim 1 wherein the secondary water spray cooler is further provided with an outlet for discharging non-condensable gases laterally above.
9. A method for pyrolysis recovery of oily sludge is characterized by comprising the following steps:
preheating the oily sludge by using high-temperature steam discharged by the oil-containing sludge frying and drying;
taking high-boiling-point recovered oil as a frying medium to fry and dry the preheated oily sludge to obtain dry oil sludge;
pyrolyzing the dry oil sludge to produce pyrolysis residue and pyrolysis gas;
utilizing heat in the pyrolysis gas, and converting high-pressure saturated water into high-pressure superheated steam;
after the temperature of the pyrolysis gas is reduced, carrying out primary oil spray cooling to obtain high-boiling-point recovered oil for storage;
and (4) carrying out secondary water spray cooling on the non-condensable gas generated after the primary oil spray cooling to obtain low-boiling-point recovered oil for storage.
10. The method for pyrolytic recovery of oily sludge according to claim 9 further comprising:
and burning the pyrolysis residues, and providing heat for pyrolysis by using high-temperature flue gas generated by burning.
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| CN202110504880.6A CN113173688B (en) | 2021-05-10 | 2021-05-10 | Pyrolysis recovery system and method for oily sludge |
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| CN116970411A (en) * | 2023-09-12 | 2023-10-31 | 亚德（上海）环保系统有限公司 | Sludge treatment device and working method thereof |
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| CN104261649A (en) * | 2014-09-28 | 2015-01-07 | 东南大学 | High-efficiency oil sludge pyrolysis oil making method and system |
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