CN113149395A

CN113149395A - Oily sludge treatment system and method

Info

Publication number: CN113149395A
Application number: CN202110508851.7A
Authority: CN
Inventors: 李乐军; 罗启贵; 邓俊
Original assignee: Sichuan Junhe Environmental Protection Co ltd
Current assignee: Sichuan Junhe Environmental Protection Co ltd
Priority date: 2021-05-11
Filing date: 2021-05-11
Publication date: 2021-07-23

Abstract

The invention discloses an oily sludge treatment system which comprises an anaerobic distillation system and a condensation separation system, wherein the anaerobic distillation system comprises a rotary drum and a shell surrounding the periphery of the rotary drum, a heating cavity is formed between the shell and the rotary drum, a heating system is arranged on the heating cavity, oily sludge is heated in the rotary drum for anaerobic distillation, distilled gas generated by the anaerobic distillation is conveyed to the condensation separation system for condensation separation to obtain non-condensable gas, liquid oil and waste water, the non-condensable gas and the liquid oil are used as fuels to be supplied to the heating system, and the non-condensable gas and combustion-supporting gas are preheated by smoke generated by combustion through a heat exchanger and then conveyed to the heating system. The invention distills and separates water and petroleum hydrocarbon in the oily sludge in an oxygen-free environment, the substance only generates physical change but not chemical change, the heating power consumption is low, the non-condensable gas and the liquid oil are recycled as fuel for utilization, the self-sufficiency is realized, the operation cost is low, the secondary pollution is avoided, and the harmless treatment is realized.

Description

Oily sludge treatment system and method

Technical Field

The invention relates to the technical field of heating, distilling and separating materials in an oxygen-free environment by adopting a rotary kiln device, in particular to an oil-containing sludge treatment system and method.

Background

The waste drilling mud produced by using mineral oil as continuous matching drilling mud for natural gas exploitation is oil-containing solid waste (oil-containing sludge for short) produced by mixing drilling fluid and oil-containing mud during drilling in the oil and gas exploitation process, is listed in waste category HW08 waste mineral oil and mineral-containing oil waste of national hazardous waste records, and has the waste code 072-001-08, wherein the hazardous property is toxicity (T), and the hazardous waste mainly contains substances such as oil, water, rock debris and the like, the components are complex and difficult to directly treat and utilize, and the hazardous waste is forbidden to be simply buried or randomly discharged.

In the prior art, the oily sludge is usually treated by adopting a burning, chemical hot washing, solidification or microbial treatment mode, wherein the burning method is to burn the oily sludge by adding fuel into the oily sludge at a high temperature of 1200-1500 ℃, but the oily sludge also contains water, so that the burning effect is influenced, the oily sludge is usually required to be pre-treated by dewatering, drying and the like before being burnt, the burning method is high in required temperature and greatly influenced by the oil content in the oily sludge, if the oily sludge contains high water and low oil content, more additional fuel is required, the treatment cost is too high, a large amount of toxic gas, particles and the like are generated during burning, and secondary pollution is caused by improper treatment; the chemical hot washing is to dilute the oily sludge by adding water, then add a chemical agent, heat the mixture after uniformly stirring to separate oil from solids, and dewater the oil after recovery to complete solid-liquid separation, and the method is simple to operate, but the oily sludge has complex components, and the oily sludge with different characteristics needs to select different chemical agents, so that the technical research and development investment cost is high, the difficulty in screening the chemical agents is high, and the method is only suitable for oily sludge with fixed components; the solidification is to add a curing agent into the oily sludge, solidify toxic substances in the oily sludge, reduce the environmental pollution and then carry out sanitary landfill, but the mode is only suitable for the condition of small treatment capacity; the microbial treatment is to degrade petroleum hydrocarbon and various heavy metal harmful substances in the oily sludge through microorganisms, the oily sludge can be used as cultivation soil after meeting the requirement of soil backfilling, but the treatment period of the microbial degradation is long, the microorganisms are restricted by specific growth and reproduction conditions (temperature and humidity), the biodegradation is incomplete, secondary treatment is required, a large amount of biodegradation fields are required, and the treatment efficiency is low. There are also methods for treating oil-containing sludge by using rotary kiln type devices, such as heating devices disclosed in CN2071317U, CN201179521Y, etc., but the uniformity of heating is low, water and petroleum hydrocarbons in oil-containing sludge are difficult to separate out sufficiently, and petroleum hydrocarbons are also easy to generate chemical changes to generate new pollutants, which causes secondary pollution.

The existing treatment mode for the oily sludge has low efficiency, small treatment capacity and high cost, is easy to generate secondary pollution, has large environmental pollution, is difficult to realize harmlessness in the treatment process, has more restrictions on conditions, and is difficult to be suitable for the oily sludge treatment under various conditions.

Disclosure of Invention

The technical problem to be solved and the technical task provided by the invention are to improve the prior art, provide an oily sludge treatment system and solve the problems of low efficiency, high cost, easy generation of secondary pollution, large environmental pollution and poor applicability of the oily sludge treatment mode in the prior art.

In order to solve the technical problems, the technical scheme of the invention is as follows:

the utility model provides an oily sludge treatment system, includes anaerobic distillation system and condensation piece-rate system, anaerobic distillation system includes the rotary drum and surrounds at rotary drum circumference outlying shell, has the space between shell and the rotary drum in order constituting the heating chamber, is provided with heating system on the heating chamber, and oily sludge is heated in order to carry out the anaerobic distillation in the rotary drum, and the distilled gas that the anaerobic distillation produced carries to condensation piece-rate system in order to carry out the condensation separation and obtain noncondensable gas, liquid oil and waste water, and noncondensable gas and liquid oil supply to heating system in order to carry out the combustion heating as the fuel, be provided with the exhaust port that is used for discharging the flue gas on the heating chamber, noncondensable gas and combustion-supporting gas carry to heating system after preheating by the flue gas through the heat exchanger earlier.

The oily sludge treatment system adopts an indirect heating mode to heat and distill oily sludge, the oily sludge is not contacted with fuel, outside air, flame, smoke and the like, distillation separation is carried out in an oxygen-free environment, chemical change of substances in the oily sludge is avoided, only physical change of water and petroleum hydrocarbons in the oily sludge is caused to be changed into a gas phase state, the heating temperature required by the mode is low, no other materials are added in the distillation separation process, the treatment power consumption and cost can be reduced, chemical components of the petroleum hydrocarbons are prevented from being damaged, therefore, the petroleum hydrocarbons can be recycled into fuel with use value, the comprehensive utilization value of the oily sludge is greatly improved, non-condensable gas (mainly VOCs) and liquid oil are obtained by recycling the petroleum, the liquid oil can be sold outside and can also be used as the fuel of the heating system together with the non-condensable gas, thereby greatly reducing the usage amount of extra auxiliary fuel required by a heating system, greatly reducing the fuel cost of the heating system, not only providing heat contribution for heating and distilling oil-containing sludge by using non-condensable gas as fuel for combustion, but also degrading toxic non-condensable gas into nontoxic waste gas by combustion, effectively reducing emission pollution, realizing harmlessness and reduction of the treatment process, fully utilizing the flue gas generated by combustion, carrying out heat exchange between the non-condensable gas and combustion-supporting gas required by combustion and the flue gas, improving the temperature of the non-condensable gas and combustion-supporting gas, improving the combustion sufficiency, improving the heat generated by combustion, improving the utilization and charge rate of the fuel, reducing the usage amount of the fuel, reducing the production cost, effectively reducing the temperature of the flue gas, reducing the emission heat pollution, improving the environmental protection performance, and effectively recycling the heat of the flue gas, the utility model provides a high energy utilization rate of sufficiency, and, the rotary drum is the tube structure of rotation, in the in-process that oily sludge is heated the distillation, oily sludge can be along with the rotation of rotary drum and constantly be turned, thereby improve the sufficiency of being heated of oily sludge, improve water in the oily sludge, oil hydrocarbon evaporation efficiency and abundance, avoid oily sludge caking or adhesion to lead to water in the rotary drum, oil hydrocarbon is difficult to effectively evaporate out, the flame that fuel produced in the burning in the heating chamber directly heats the rotary drum, the flue gas that the burning produced simultaneously is discharged after the heating chamber flows, the flue gas also plays the effect of auxiliary heating to the rotary drum, adopt the mode of dual heating, improve heat utilization, reduce fuel consumption, reduction in production cost.

Furthermore, along the advancing direction of the oily sludge in the rotary drum, at least two temperature zones with different heating temperatures are arranged in the rotary drum, so that the oily sludge is heated step by step, the heating sufficiency and uniformity of the oily sludge are improved, and the water and petroleum hydrocarbons in the oily sludge can be fully evaporated and separated.

Further, along the traveling direction of the oily sludge in the rotary drum, the rotary drum comprises a drying area for water evaporation and an evaporation area for petroleum hydrocarbon evaporation which are arranged in sequence. The evaporation temperature of water is different from that of petroleum hydrocarbon, the water content and the oil content in different oil-containing sludge are different, if the uniform heating temperature is adopted in the whole process, the situation that water or petroleum hydrocarbon is not completely evaporated and separated can occur, in the axial advancing process of the oil-containing sludge along the rotary drum, water and petroleum hydrocarbon are evaporated in different temperature zones, the advancing speed of the oil-containing sludge can be controlled by controlling the rotating speed of the rotary drum and the like, so that the processing time of the oil-containing sludge in a drying zone and an evaporation zone is controlled, and the water and the petroleum hydrocarbon are ensured to be respectively and fully distilled and separated.

Furthermore, the heating temperature in the rotary cylinder is 100-185 ℃, and the heating temperature in the evaporation zone is about 185-450 ℃, so that the water and the petroleum hydrocarbon are fully distilled and separated in the drying zone and the evaporation zone respectively.

Furthermore, the shell is arranged in a standing mode, and a sealing mechanism which is used for sealing the heating cavity and guaranteeing the rotation of the rotary drum is arranged between the shell and the rotary drum.

Further, the sealing mechanism is formed by combining a plurality of sealing components.

Furthermore, the sealing mechanism is composed of a plurality of sealing components of spring carbon ring sealing, packing sealing, fish scale sealing and nitrogen sealing.

Further, the spring carbocycle seal include graphite piece and spring, the graphite piece sets up a plurality ofly along the circumference of revolving drum, graphite piece and with set up the spring between the shell, the spring orders about the graphite piece and compresses tightly the laminating on the outer wall of revolving drum, cooperate and then whole graphite piece enclose into closed annular through along revolving drum axial stagger step between the adjacent graphite piece.

Furthermore, the packing seal comprises a circular correction ring and a packing box, the circular correction ring is fixed on the outer wall of the rotary cylinder, the packing box is annular and surrounds the periphery of the circumference of the circular correction ring, and packing attached to the circular correction ring is filled in the packing box.

Furthermore, the nitrogen sealing is to introduce nitrogen with preset pressure into the cavities of other sealing components through an air pipe.

Further, the heating system comprises a burner arranged on the heating cavity, combustion-supporting gas and fuel are conveyed to the burner, the fuel and the combustion-supporting gas are mixed by the burner and then are combusted in the heating cavity, and the rotary drum is directly heated by utilizing the combustion flame.

Furthermore, the burners are respectively arranged on two opposite sides of the heating cavity, the heating uniformity is improved, the consumption of fuel and combustion-supporting gas consumed by the burners on one side can be reduced, the phenomenon that the atomization effect is poor due to the excessive consumption of the fuel is avoided, the fuel is sprayed into the heating cavity in a droplet shape to influence the combustion sufficiency, the droplet-shaped fuel falls on refractory bricks on the wall surface of the heating cavity to generate deflagration, the service life of the refractory bricks can be reduced, a large amount of carbon deposition can be generated on the burners to influence the service life, the flame generated by combustion is too long due to the excessive consumption of the combustion-supporting gas, the refractory bricks on the side wall surface of the heating cavity can be ablated, a partition wall is arranged in the heating cavity and is positioned in the middle of the connection line of the burners on two sides, the partition wall separates the flames generated by the burners on two sides, the cross influence of the tail ends of the flames is avoided, and the tail ends of the flames can turn back to form a strong turbulent flow zone after encountering the partition wall, force high temperature flue gas constantly to strong upper portion operation, strong turbulent flow district still can carry the fuel droplet of not complete combustion constantly to mix and burn with the flue gas when rising, is unlikely to drop and causes the deflagration on the firebrick of heating chamber bottom, improves the combustion sufficiency of fuel, improves heating efficiency.

Further, heating system including the noncondensable gas pipeline that communicates to the heating chamber, noncondensable gas lets in the heating chamber through noncondensable gas pipeline, and noncondensable gas directly lets in the heating chamber then is lighted by the combustor and burns, improves heating efficiency, and noncondensable gas is retrieved and is recycled, reduces and discharges the pollution, improves the comprehensive utilization value of oily sludge.

Furthermore, the outer wall of the rotary cylinder is provided with a helical blade, the helical blade rotates along with the rotary cylinder to push the smoke in the heating cavity to move towards one axial end of the rotary cylinder, and the smoke outlet is arranged at the other axial end close to the rotary cylinder. Utilize helical blade to make the flue gas in the heating chamber along revolving drum axial flow, and the exhaust port is in the reversal of air current direction, that is to say, the air current direction that flue gas combustion gas air current direction and helical blade produced is opposite to can reduce the flue gas from exhaust port exhaust velocity of flow, can make the high temperature flue gas that the burning produced longer remain in the heating chamber, prolong the hot exchange time of flue gas and revolving drum, improve the thermal utilization of flue gas and fill up the rate, improve the heating homogeneity.

Further, helical blade adopts the heat conduction material to make, for the heat exchange area that has increased the revolving drum, improves heat exchange efficiency for the flue gas can more effectively heat the revolving drum, reduces the production energy consumption.

Furthermore, a plurality of lifting plates distributed at intervals along the circumferential direction are arranged on the inner wall of the rotary drum, the oil-containing sludge is fully turned by the lifting plates, the heating uniformity is improved, water and petroleum hydrocarbons in the oil-containing sludge can be fully separated by distillation, and the problem that the oil-containing sludge is caked or adhered to the inner wall of the rotary drum to cause the water and petroleum hydrocarbons to be difficult to effectively separate by distillation is avoided.

And further, the distillation gas enters the settling separation chamber to settle and separate solid particles and liquid drops to obtain a primary clean gas, and the primary clean gas enters the condensation separation system to be condensed and separated. When the distilled gas is discharged out of the anaerobic distillation system, part of solid particles and liquid drops are carried out together by the distilled gas, the solid particles and the liquid drops can influence the treatment efficiency of the condensation separation system, cause pipeline blockage and the like, the solid particles can remain in the finally obtained liquid oil, the purity and the quality of the liquid oil can be influenced, and the combustion performance of the liquid oil when the liquid oil is used as fuel is influenced. No pollution to the environment.

Further, be provided with heating device on the sedimentation separator, avoid the distillation gas to take place the condensation and separate out liquid oil in the sedimentation separator, thereby liquid oil can take place to subside in the sedimentation separator and sneak into solid-state granule, leads to the liquid oil of final recovery to reduce, sets up heating device in order to keep certain temperature on the sedimentation separator, avoids useful composition to take place the condensation to separate out, effectively ensures the rate of recovery of useful composition.

Furthermore, the wall surface of the settling separation chamber is provided with a heat insulation layer, so that heat exchange with the outside is avoided, heat loss is reduced, the distilled gas is prevented from condensing in the settling separation chamber to separate out liquid oil, and the recovery rate of useful components is improved.

Furthermore, the sludge that the anaerobic distillation system produced is defeated and is sent into sediment cooling device and cool off, can remain certain harmful substance in the sludge, volatilizees more easily when the temperature is high and scatters, all can cause harm to environment and personnel, reduces the temperature of sludge and can effectively reduce and discharge the pollution.

Further, the system also comprises an inert gas supply system, wherein the inert gas supply system is used for conveying inert gas into the rotary cylinder of the anaerobic distillation system, and the inert gas is used for discharging air in the rotary cylinder, so that the oxygen content in the rotary cylinder can reach the required anaerobic environment, the substances in the oily sludge are prevented from being oxidized and changed during heating and distillation, and the recovery rate of petroleum hydrocarbons is ensured.

The oily sludge is heated, distilled and separated in an oxygen-free environment to obtain distilled gas and sludge, the distilled gas comprises water vapor and petroleum hydrocarbon gas, the distilled gas is condensed and separated to obtain non-condensable gas, liquid oil and waste water, the non-condensable gas and the liquid oil are used as fuels to be combusted to heat the oily sludge, and the non-condensable gas and combustion-supporting gas required by combustion are preheated by utilizing smoke generated by combustion. The oily sludge treatment method of the invention heats and distills the oily sludge in an oxygen-free environment, so that the water and the petroleum hydrocarbon in the oily sludge are only changed into a gas phase state through physical change, the water and the petroleum hydrocarbon are separated from the oily sludge through distillation, the oily sludge is harmlessly treated, the non-condensable gas and the liquid oil obtained by condensing the distilled gas are simultaneously used as fuel to heat the oily sludge, the comprehensive utilization value of the oily sludge is greatly improved, the fuel cost required for heating the oily sludge is reduced, the toxic non-condensable gas is degraded into nontoxic waste gas by combustion, the emission pollution is effectively reduced, and the secondary pollution is avoided, the requirements on the component conditions of the oily sludge are not high, only the heating temperature meets the evaporation requirements, the application range is wide, the treatment efficiency is high, the treatment capacity is large, and the method is suitable for large-scale implementation.

Furthermore, the heating temperature of the oily sludge is less than or equal to 450 ℃, the substances in the oily sludge are ensured to be changed into a gas phase state only through physical change, no chemical change and no additional waste are produced, the petroleum hydrocarbons in the oily sludge can be effectively recycled into usable fuel, and the comprehensive utilization value of the oily sludge is improved.

Furthermore, the water in the oily sludge is distilled by heating at the temperature of 100-185 ℃, the petroleum hydrocarbon in the oily sludge is distilled by heating at the temperature of 185-450 ℃, and the water and the petroleum hydrocarbon are distilled and separated at different temperatures respectively, so that the distillation and separation sufficiency is improved, and the water content and the oil content of the finally obtained sludge are effectively reduced.

Furthermore, the distilled gas is subjected to settling separation treatment to remove solid particles and liquid drops carried by the distilled gas to obtain a primary clean gas, and the primary clean gas is subjected to condensation separation treatment to avoid the solid particles from remaining in the finally obtained liquid oil, so that the purity and the quality of the liquid oil are improved, and the combustion performance of the liquid oil when used as fuel is guaranteed.

Furthermore, the sludge is cooled and then collected and stored, so that the thermal pollution caused by overhigh temperature of the sludge is avoided, harmful gas is emitted due to overhigh temperature of the sludge, and the emission pollution is reduced.

Compared with the prior art, the invention has the advantages that:

the oily sludge treatment system provided by the invention can be used for distilling and separating water and petroleum hydrocarbons from oily sludge in an oxygen-free environment, the heating temperature is low, the substances in the oily sludge do not generate chemical changes, the power consumption required by heating is low, the treatment cost is low, the petroleum hydrocarbons are effectively recovered to be fuel for recycling, the fuel can be self-sufficient, the operation cost is low, the comprehensive utilization value of the oily sludge is greatly improved, toxic non-condensable gas is degraded into non-toxic waste gas through combustion, the emission pollution is effectively reduced, the secondary pollution is avoided, and the harmless treatment is realized;

the heat of the flue gas generated in the combustion process is recycled, and the combustion-supporting gas and the fuel are preheated by the flue gas, so that the combustion sufficiency is improved, the heat generated by combustion is improved, the emission pollution is reduced, and the energy utilization rate is improved;

the requirements on the component conditions of the oily sludge are low, the method is applicable to various types of oily sludge, and the water and petroleum hydrocarbons in the oily sludge can be effectively and fully separated by distillation;

simple structure, convenient implementation, no need of occupying an overlarge field, high treatment efficiency and large treatment capacity, and is suitable for large-scale implementation.

Drawings

FIG. 1 is a schematic structural view of an oily sludge treatment system;

FIG. 2 is a schematic diagram of the construction of an anaerobic distillation system;

FIG. 3 is a schematic structural view of a cross section of an anaerobic distillation system;

FIG. 4 is a schematic structural view of a helical blade on a rotary drum;

FIG. 5 is a schematic diagram of the structure of a single graphite block sealed by a spring carbon ring and a spring;

FIG. 6 is a schematic view of a structure of a spring carbon ring sealed whole-circle graphite block matched with a spring;

FIG. 7 is a schematic view of a U-shaped ring structure of a spring carbon ring seal;

FIG. 8 is a schematic diagram of a packing-sealed circular correction ring;

FIG. 9 is a schematic view of the construction of a stuffing box for a stuffing seal;

FIG. 10 is a schematic view of a stuffing box with stuffing filled therein;

FIG. 11 is a schematic structural view of a scale seal;

fig. 12 is a schematic view of a nitrogen-sealed gas tube.

In the figure: a rotary drum 1; a helical blade 11; a housing 2; a heating chamber 3; a smoke outlet 31; a partition wall 32; a burner 4; a non-condensable gas conduit 5; a material raising plate 6; a settling separation chamber 7; a heating device 71; an insulating layer 72; a slag cooling device 8; a blanking cover 81; graphite block a 1; spring a 2; u-shaped ring a 3; a circular correction ring a 4; stuffing boxes a 5; friction ring a 6; a flexible sealing sheet a 7; ropes a 8; air pipe a 9.

Detailed Description

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.

The oily sludge treatment system and method disclosed by the embodiment of the invention have the advantages of high efficiency, large treatment capacity, small occupied area and field resource saving. The treatment power consumption is low, the implementation cost is low, the method can be suitable for treating the oily sludge under various conditions, the treatment process is harmless, and the secondary pollution is avoided.

Example one

As shown in fig. 1 to 12, an oily sludge treatment system mainly comprises an anaerobic distillation system and a condensation separation system, wherein the anaerobic distillation system comprises a rotary drum 1 and a shell 2 surrounding the periphery of the rotary drum 1, a space is formed between the shell 2 and the rotary drum 1 to form a heating cavity 3, the heating cavity 3 surrounds the periphery of the rotary drum 1, the heating cavity 3 is provided with a heating system, the heating system adopts a fuel combustion mode to heat, the rotary drum 1 is a cylinder body with two open ends, the rotary drum 1 is driven by a motor component to rotate around the axis thereof, the shell 2 is arranged in a standing way, namely the rotary drum 1 rotates relative to the shell 2 in the shell 2, sealing mechanisms are respectively arranged between the two ends of the shell 2 and the rotary drum 1 in the axial direction of the rotary drum 1, and radial gaps are formed between the two ends of the shell 2 and the rotary drum 1, the radial gap is sealed by using the sealing mechanism, the rotary drum 1 can be ensured to rotate smoothly while the sealing performance of the heating cavity 3 is ensured, heat generated by combustion is prevented from dissipating from the heating cavity 3, the heat utilization efficiency is improved, and the fuel consumption is reduced, specifically, the shell 2 is divided into an upper half and a lower half along the axial direction of the rotary drum 1, the upper half and the lower half are connected through bolts, the splicing parts of the upper half and the lower half are sealed through compressing asbestos ropes, the sealing mechanism between the rotary drum 1 and the shell 2 is of a composite structure and is formed by combining various sealing components, and the rotary drum 1 can be ensured to rotate smoothly while the sealing performance is ensured;

a larger radial gap is reserved between the two ends of the shell 2 and the rotary drum 1, the radial gap is reserved for deformation and thermal expansion of the rotary drum 1 in the rotation process, but dust, smoke and air can pass through the radial gap in the production process to cause environmental pollution or explosion risk and the like, so that the radial gap needs to be sealed and the smooth rotation of the rotary drum 1 is ensured, and particularly, the sealing components adopted by the sealing mechanism mainly comprise spring carbon ring sealing, packing sealing and fish scale sealing;

the spring carbon ring seal comprises a plurality of graphite blocks a1 arranged along the circumferential direction of the rotary cylinder 1, the graphite blocks a1 are fan-shaped, a spring a2 is arranged between the graphite block a1 and the outer shell 2, the spring a2 presses and abuts the graphite block a1 on the outer wall of the rotary cylinder 1, adjacent graphite blocks a1 are matched through staggered steps along the axial direction of the rotary cylinder 1, so that the graphite blocks a1 around the circumferential direction of the rotary cylinder 1 are spliced into a complete closed ring without circumferential gaps, the graphite blocks a1 are soft in texture, the rotary cylinder 1 can rotate relative to the graphite blocks a1 to enable the graphite blocks a1 to rub to generate graphite powder, the graphite powder can play a role in lubrication, the smoothness of the rotation of the rotary cylinder 1 is improved, meanwhile, the abrasion of the graphite blocks a1 is reduced, small gaps can be filled with the graphite powder, the sealing performance is enhanced, the spring a2 ensures that the graphite blocks a1 are always elastically attached to the outer wall of the rotary cylinder 1, even if the rotary drum 1 is deformed or thermally expanded, the elastic compensation can be performed due to the action of the spring a2, so that stable sealing performance is always ensured, in the embodiment, 24 graphite blocks a1 are totally arranged, the graphite block a1 and the spring a2 are arranged in a U-shaped ring a3, the U-shaped ring a3 is an annular piece as a whole, the radial section of the U-shaped ring a3 is a U-shaped groove, the U-shaped ring a3 is sleeved on the circumferential periphery of the rotary drum 1, the U-shaped ring a3 is fixedly connected with the outer shell 2, the opening direction of the U-shaped ring a3 faces to the outer wall of the rotary drum 1, the graphite block a1 and the spring a2 are arranged in the U-shaped groove of the U-shaped ring a3, the expansion direction of the spring a2 is along the radial direction of the rotary drum 1, and the side wall of the U-shaped groove of the U-shaped ring a3 is contacted with the graphite block a1 through a asbestos packing, so that the sealing performance is further improved;

the packing seal comprises a circular correction ring a4 and a packing box a5, wherein the circular correction ring a4 is fixed on the outer wall of the rotary cylinder 1 by welding and the like, the rotary cylinder 1 is corrected by the circular correction ring a4, the out-of-roundness of the rotary cylinder 1 caused by the welding of a rolling plate is reduced, so that the non-uniformity of radial gaps caused by the out-of-roundness is reduced, the packing box a5 is annular and surrounds the periphery of the circular correction ring a4, the packing box a5 is fixedly connected with the shell 2, specifically, the packing box a5 is fixedly connected with the U-shaped ring a3, the packing box a5 is filled with packing, and the packing is in contact with the circular correction ring a4 to increase the gas leakage resistance;

in the production and use process, the filler can be worn or extruded to deform, gaps can inevitably occur, so that the sealing is failed, the fish scale seal is increased, the fish scale seal is flexible seal, the sealing performance is further improved, the gaps can be automatically compensated, specifically, the fish scale seal comprises a friction ring a6 and a flexible sealing sheet a7, the friction ring a6 is made of wear-resistant materials and is sleeved and fixed on the periphery of the rotary cylinder 1, one end of the flexible sealing sheet a7 is fixedly connected with the shell 2, the other end of the flexible sealing sheet a7 is attached to the friction ring a6, specifically, an annular framework along the circumferential direction of the rotary cylinder 1 is arranged on the filler box a5, the flexible sealing sheet a7 is fixed on the framework through bolts, a plurality of flexible sealing sheets a7 are arranged along the circumferential direction of the rotary cylinder 1, a sealing sheet laminating area is arranged between adjacent flexible sealing sheets a7, so that a complete ring is formed by enclosing, and cotton cloth is laminated between adjacent flexible sealing sheets a7, the joint sealing performance is further improved, gas leakage at a gap between adjacent flexible sealing pieces a7 is avoided, the rotary drum 1 drives the friction ring a6 to rotate together when rotating, the friction ring a6 slides relative to the flexible sealing pieces a7, the flexible sealing pieces a7 have elastic deformation capacity, even if the rotary drum 1 deforms or thermally expands, the flexible sealing pieces a7 can perform compensatory deformation, the flexible sealing pieces a7 are always tightly attached to the friction ring a6 and are also tightly attached to the adjacent flexible sealing pieces a7, so that the long-term and stable sealing performance is guaranteed, in order to further improve the sealing performance, a rope a8 which is wound along the circumferential direction of the rotary drum 1 is arranged in the middle of the flexible sealing pieces a7 along the axial direction of the rotary drum 1, and the rope a8 is tensioned by using a steel wire ropes, so that the flexible sealing pieces a7 can be more tightly attached to the friction ring a 6; the flexible seal has the advantages that the problem of jumping caused by non-concentricity during the rotary motion of the cylinder body can be overcome, or the cylinder body is scratched at the head after being deformed due to improper use, the defects of spring carbon ring seal and packing seal are overcome, the fish scale seal is wear-resistant and high-temperature-resistant, the long-acting and stable sealing performance is guaranteed, meanwhile, the rotary cylinder 1 can be ensured to smoothly rotate, and the oily sludge in the rotary cylinder 1 can be uniformly heated;

the composite sealing structure formed by adopting a plurality of sealing modes can meet the strict requirements of oily sludge treatment, the production safety is ensured while the normal production is not influenced, in order to ensure that isolated air enters the anaerobic distillation system under extreme conditions, nitrogen sealing is also arranged, nitrogen with preset pressure is filled into cavities (including a U-shaped ring a3, a packing box a5 and a space between a flexible sealing sheet a7 and the outer wall of the rotary drum 1) of other sealing components through an air pipe a9, the preset pressure of the nitrogen is greater than the pressure in a pressure combustion cavity in the anaerobic distillation system, the pressure in the rotary drum and the external pressure, the nitrogen is used for forming air sealing, the gas exchange between the inside and the outside of the anaerobic distillation system is avoided, the nitrogen is non-toxic and harmless, the chemical stability is good, the nitrogen is difficult to react with other substances, and the nitrogen overflows to the environment or permeates into the anaerobic distillation system and cannot generate adverse effects, high use reliability, convenient preparation and low use cost. However, if the first three sealing assemblies do not form a sealing cavity, the system consumes a large amount of nitrogen, so that the amount of non-condensable gas and waste gas in the treatment process of the oily sludge is increased, and meanwhile, a large amount of electric energy is wasted and the production cost is increased for increasing the load of nitrogen making equipment. Through the combination of the four sealing modes, the sealing performance is effectively improved, the good sealing performance is always ensured by automatic compensation in the rotating process of the rotary drum 1, the problem of dust and smoke leakage pollution is solved, and the production safety is improved.

The fuel is burnt in the heating cavity 3 and the oily sludge added into the rotary drum 1 is heated through the rotary drum 1 to distill water and petroleum hydrocarbon in the oily sludge, the oily sludge is in the rotary drum 1 and is in an anaerobic environment, the oily sludge is not contacted with flame generated by burning, so that the oily sludge is subjected to anaerobic distillation, the heating temperature in the whole rotary drum 1 is less than or equal to 450 ℃, the oily sludge is prevented from generating chemical change, no additional pollutant is generated, substances in the oily sludge are only subjected to physical change, the liquid water and petroleum hydrocarbon are evaporated into a gas state to obtain distilled gas, then the distilled gas is collected and treated by a condensation separation system to obtain useful substances (including non-condensable gas and liquid oil) capable of being used as fuel, and the comprehensive utilization value of the oily sludge is improved.

The axial direction of the rotary drum 1 is inclined to the horizontal plane at a certain angle, the higher end of the rotary drum 1 is a feed inlet, the lower end of the rotary drum 1 is a discharge outlet, and the oily sludge is added into the rotary drum 1 from one end of the feed inlet. The oily sludge packaged by ton bags in the temporary storage room of a drilling well site is transported to a special dangerous goods transport vehicle by a forklift or a crane, the vehicle is completely closed, does not leak and does not drop materials, the stored oily sludge is crushed and weighed in a warehouse and then transported to a hopper of a production workshop by a closed belt conveyor, and then is sent into a feed inlet of a rotary drum 1 by a sealed spiral conveyor. The rotary drum 1 rotates to enable the oily sludge to move forwards along the axial direction of the rotary drum 1, and the oily sludge can be turned along the circumferential direction of the rotary drum 1 along with the rotation of the rotary drum 1, so that the oily sludge is prevented from being agglomerated or adhered to the inner wall of the rotary drum, the heating uniformity is improved, and the distillation and separation sufficiency of water and petroleum hydrocarbon in the oily sludge is improved.

Heating system is including setting up combustor 4 on heating chamber 3, combustion-supporting gas and fuel are carried to combustor 4, fuel and combustion-supporting gas pass through the combustor and mix then burn in heating chamber, the flame that fuel burning produced in the heating chamber is to rotary drum direct heating, the flue gas that the while burning produced flows the back through setting up exhaust port 31 on heating chamber 3 and discharges at the heating chamber, the flue gas also plays the effect of auxiliary heating to rotary drum 1, the whole circumference of rotary drum 1 can be encircleed to the flue gas, improve heating homogeneity and sufficiency, adopt the mode of dual heating, heat utilization rate is high, reduce the production energy consumption, reduce the treatment cost.

The burners 4 are distributed on the axial side of the rotary drum, specifically, in the cross section direction of the rotary drum, holes for installing the burners 4 are respectively arranged on the left side and the right side of the outer shell 2, the burners 4 are close to the bottom side of the outer shell 2, further, two groups of burners 4 are arranged at intervals along the axial direction of the rotary drum 1, in the axial direction of the rotary drum 1, the burners 4 are closer to one end of the discharge port, along the advancing direction of the oily sludge in the rotary drum 1, namely, along the direction from the feed port to the discharge port of the rotary drum 1, the rotary drum 1 comprises two temperature zones with different heating temperatures, the temperature zone close to the feed port is a drying zone mainly used for water evaporation, the temperature zone close to the discharge port is an evaporation zone mainly used for evaporation of petroleum hydrocarbons, the heating temperature of the drying zone is 100-185 ℃, the heating temperature of the evaporation zone is about 185-450 ℃, water and petroleum hydrocarbon are evaporated and separated in different temperature zones respectively, the advancing speed of the oily sludge in the rotary drum 1 can be controlled by controlling the work of the rotary drum 1, so that the processing time of the oily sludge in a drying zone and an evaporation zone is controlled, the water in the oily sludge can be fully evaporated and separated in the drying zone, and the petroleum hydrocarbon in the oily sludge can be fully evaporated and separated in the evaporation zone.

And, be provided with partition wall 32 in the heating chamber 3, partition wall 32 is located the middle part of the left and right sides combustor 4 line, the flame injection direction of both sides combustor 4 is towards partition wall 32, the partition wall separates the flame that the combustor produced of both sides, avoid the terminal cross influence of flame, the flame end can turn back after meetting the partition wall and form strong turbulent zone, force high temperature flue gas constantly to strong upper portion operation, strong turbulent zone still can carry the fuel droplet of not complete combustion constantly to mix and burn with the flue gas when rising, be unlikely to drop to the heating chamber bottom and arouse deflagration on the firebrick, improve the combustion sufficiency of fuel, improve heating efficiency, and when only needing low temperature, only open the combustor of one side, and open the combustor of both sides when needing high temperature.

In order to improve the combustion sufficiency of the fuel, a turbine is arranged in the combustor 4 to promote the mixing of the combustion-supporting gas and the fuel, the combustion-supporting gas forms rotational flow and the fuel is quickly mixed through turbocharging, the more the mixing is, the quicker and more the combustion is, the more the generated heat is, and the utilization efficiency of the fuel is improved; the size of the nozzle of the burner 4 is limited, the flame generated during fuel combustion is concentrated, so that the heating area is small and concentrated, the condition of excessive concentration of heat can occur, the local temperature of the rotary drum is too high, the temperature of other parts cannot meet the requirement, the substance in the oily sludge can be chemically changed due to the local too high temperature, and the water and petroleum hydrocarbon can be difficultly and fully distilled and separated due to the area with the unavailable temperature, in the embodiment, the burner 4 is branched and connected with a plurality of nozzles, specifically, 10 to 20 nozzles can be connected, the originally concentrated flame is divided and dispersed, so that the coverage area of the flame is increased, high-temperature particles are not easy to form in the heating cavity, the heating uniformity is improved, the nitrogen can generate violent chemical reaction with oxygen to generate NOx in an aerobic environment at the temperature of not lower than 1300 ℃, the nozzle is used for dividing and dispersing the flame, the heat conduction is accelerated, so that the flame temperature is controlled below 1000 ℃, thereby inhibiting NOx and generating no gaseous nitrogen oxide pollutants.

In order to further improve the heat energy utilization rate, the outer wall of the rotary drum 1 is provided with a spiral blade 11, the spiral blade 11 rotates along with the rotary drum 1 to push the smoke in the heating chamber 3 to move towards one axial end of the rotary drum 1, the smoke outlet 31 is arranged at the other axial end close to the rotary drum 1, specifically, the spiral blade 11 pushes the smoke towards the end where the discharge port of the rotary drum 1 is located, the smoke outlet 31 is close to the end where the feed port of the rotary drum 1 is located, an exhaust fan can be arranged on the smoke outlet to enable the smoke to be extracted from the smoke outlet, the flow direction of smoke exhaust is opposite to that of air generated by the spiral blade, the flow speed of the smoke exhaust from the smoke outlet is reduced, the retention time of the smoke in the heating chamber is prolonged, the smoke has more time to heat the rotary drum 1, the spiral blade 11 is made of a heat conducting material, and preferably made of brass, the heat conducting property is good, the heat exchange area of the rotary drum 1 is increased, the heat exchange efficiency of the flue gas and the rotary drum 1 is improved, and the heat utilization is improved.

The method comprises the steps that oily sludge is heated and distilled in a rotary drum 1, water and petroleum hydrocarbon are heated and evaporated to be gaseous, distilled gas is obtained, the rest part of the oily sludge is sludge, the sludge is discharged from a discharge port, a draught fan is arranged to pump the distilled gas out of the rotary drum 1, the distilled gas can be pumped out from a feed port of the rotary drum 1, the interior of the rotary drum 1 can be slightly negative pressure by the draught fan, the distilled gas is conveyed to a condensation separation system after being pumped out to be subjected to condensation separation to obtain non-condensable gas (mainly VOCs), liquid oil and waste water, the non-condensable gas and the liquid oil are useful materials and can be used as fuel, the comprehensive utilization value of the oily sludge is improved, the liquid oil can be collected and sold, and can also be used as fuel of a heating system together with the non-condensable gas, so that the fuel required by the heating system can be self-sufficient, and the operation cost is reduced, the method is characterized in that toxic noncondensable gas is used as fuel of a heating system to be directly combusted and degraded into nontoxic waste gas, pollution of volatile organic pollutants to the atmosphere is avoided, harmless treatment is achieved, the noncondensable gas and liquid oil are main fuel of the heating system, when the amount of the noncondensable gas and the liquid oil is insufficient or the oily sludge treatment system just starts to operate, auxiliary fuel can be supplied to the heating system firstly to prepare enough noncondensable gas and liquid oil firstly, then the main fuel is switched to supply, so that the oily sludge treatment system achieves a self-fuel supply state, the auxiliary fuel can be natural gas, gasoline, diesel oil and the like, and the auxiliary fuel can be flexibly selected according to actual conditions.

In this embodiment, the condensation separation system includes a condenser, a gas-liquid separator and an oil-water separator, which are sequentially disposed, the distilled gas is cooled in the condenser, the water vapor and the petroleum hydrocarbon gas are condensed into a liquid to obtain water and liquid oil, the distilled gas also includes non-condensable gas (mainly VOCs), that is, the distilled gas is changed into a gas-liquid mixture after passing through the condenser, then the gas-liquid separator processes the gas-liquid mixture to obtain separated non-condensable gas and oil-water mixture, then the oil-water mixture processes the oil-water separator to obtain wastewater and liquid oil, the oil-water mixture performs high-speed centrifugal separation in the oil-water separator, the liquid oil is stored in a storage tank for temporary storage, and the wastewater can be sold or supplied to a burner of the heating system through a pump, the wastewater enters the wastewater treatment system for purification, and the wastewater is subjected to air flotation, oil separation, hydrolytic acidification, anaerobic treatment, and anaerobic treatment, After facultative, aerobic and flocculating settling, the sewage is discharged into a municipal pipe network to a park sewage treatment plant for treatment after reaching the standard.

In this embodiment, liquid oil is carried to combustor 4 and combustion-supporting gas mixed combustion in order to heat revolving drum 1, heating system still including the noncondensable gas pipeline 5 that communicates to heating chamber 3, noncondensable gas directly lets in heating chamber 3 through noncondensable gas pipeline 5, noncondensable gas pipeline 5 is close to the bottom side of shell 2, and the noncondensable gas that lets in heating chamber 3 is lighted by the combustor and is burnt to heat revolving drum 1.

The flue gas that the burning produced has higher calorific value, and direct emission is big to environmental pollution to the heat waste is serious, and noncondensable gas and combustion-supporting gas carry to heating system after passing through the heat exchanger and preheating by the flue gas earlier, thereby can improve the temperature of noncondensable gas and combustion-supporting gas, improve the combustion sufficiency, improve the heat that the burning produced, improve fuel utilization ratio, reduce fuel usage, flue gas after the heat transfer cooling gets into flue gas processing system and carries out purification treatment, flue gas processing system including quench tower, scrubbing tower and the active carbon adsorption equipment that sets gradually, in the scrubbing tower is sent into through the draught fan again after the flue gas gets into the quench tower cooling, the flue gas is in the scrubbing tower with the thick liquid reverse contact that sprays that contains the desulfurizer, a small amount of dust, SO in the flue gas₂And after being absorbed by the spraying slurry, the acidic gas falls into a liquid pool at the bottom of the washing tower, the flue gas enters a demister at the upper part of the washing tower and a dry filter to remove fog drops, is deeply treated by a two-stage activated carbon adsorption device and then is discharged into the atmosphere, the slurry is sent into a plate frame for filter pressing and dehydration at regular time, the solid is sent to a cement plant, and the liquid returns to the washing tower for cyclic utilization.

In order to further improve the heating uniformity, a plurality of lifting blades 6 distributed at intervals along the circumferential direction are arranged on the inner wall of the rotary drum 1, the lifting blades 6 are plates approximately along the radial direction of the rotary drum 1, and the lifting blades 6 are used for fully turning, lifting and colliding the oily sludge to avoid the oily sludge from caking or adhering to the inner wall of the rotary drum, so that the oily sludge is broken more finely, the oily sludge can be kept in a loose state, and the evaporation and separation sufficiency of water and petroleum hydrocarbons is improved. Further, the rotary drum 1 is driven by the motor assembly to rotate, specifically, a positive and negative rotation staggered mode can be adopted, the rotary drum 1 rotates clockwise, part of oily sludge can rotate to the top side along with the rotary drum 1 under centrifugal action force, then the rotary drum 1 stops rotating, the oily sludge positioned at the top side can fall down due to self gravity, the oily sludge collides when falling, so that the oily sludge is effectively prevented from caking or adhering to the inner wall of the rotary drum, the crushing degree of the oily sludge is improved, then the rotary drum 1 rotates anticlockwise, the rotary drum 1 stops again after rotating for a certain degree, the reciprocating is carried out, the crushing sufficiency of the oily sludge can be effectively improved, the evaporation and separation sufficiency of water and petroleum hydrocarbon is improved, because the axial direction of the rotary drum 1 inclines to the horizontal plane at a certain angle, the movement amount of the oily sludge along the axial direction of the rotary drum can be generated when the oily sludge falls due to self gravity, so that the oily sludge advances to one end of the discharge hole in a spiral track. And the material raising plates 6 are distributed at intervals along the axial direction of the rotary drum 1, the sufficiency of turning, raising and collision of the oil-containing sludge can be further improved, the oil-containing sludge is heated by being contacted with the wall surface of the rotary drum 1, if the material raising plates 6 are continuously arranged along the axial direction of the rotary drum 1, the oil-containing sludge can be blocked by the continuous material raising plates 6 when falling from the top side and then be taken up again, the oil-containing sludge is difficult to be fully contacted with the wall surface of the rotary drum 1, and the heating efficiency of the oil-containing sludge can be influenced.

In this embodiment, the oily sludge treatment system is further provided with a settling separation chamber 7, the distilled gas enters the settling separation chamber 7 to settle and separate solid particles and liquid drops to obtain a primary clean gas, and the primary clean gas enters the condensation separation system to be condensed and separated. Because the oily sludge is continuously stirred in the rotary drum 1, the dust formed by solid particles and liquid drops can be generated, and when the distilled gas is pumped out from the rotary drum 1, the solid particles and the liquid drops are taken out together by the distilled gas. Specifically, the settling separation chamber 7 is covered on a feed inlet of the rotary drum 1, distilled gas generated by distillation of the oily sludge enters the settling separation chamber 7 from the feed inlet, and solid particles and liquid drops carried in the distilled gas naturally sink under the action of self gravity, so that the distilled gas is separated from a gas phase part.

The settling separation chamber 7 is provided with a heating device 71, specifically, the heating device 71 is a heating coil arranged along the wall surface of the settling separation chamber 7, specifically, the heating coil is a pipeline for circularly introducing a heat source medium, has good heating uniformity, avoids the distillation gas from condensing in the settling separation chamber to separate out liquid oil, improves the recovery rate of the liquid oil, in order to avoid the heat exchange between the distilled gas and the outside at the settling separation chamber 7, preferably, the flue gas generated by the combustion of the fuel in the heating chamber 2 is introduced into the heating coil to heat the distilled gas, so that the waste heat of the flue gas is fully utilized, the energy utilization rate is improved, the overall power consumption and the cost are reduced, the wall surface of the settling separation chamber 7 is provided with the heat insulation layer 72, so that heat loss is reduced, the utilization rate of heat generated by the heating device 71 is improved, power consumption is reduced, and the recovery rate of useful components is improved.

And conveying the sludge generated by the anaerobic distillation system into a slag cooling device 8 for cooling, so as to reduce the temperature of the sludge. And the emission pollution is reduced. Specifically, the discharge cover of the rotary drum 1 is connected with a blanking cover 81, the rotary drum 1 can rotate, the blanking cover 81 is arranged in a standing mode, the blanking cover 81 covers the circumference of the rotary drum 1, the rotary drum 1 rotates relative to the blanking cover 81, a radial gap is formed between the rotary drum 1 and the blanking cover 81, a sealing mechanism for sealing the radial gap is arranged between the rotary drum 1 and the blanking cover 81, the sealing mechanism can be a sealing mechanism between the rotary drum 1 and the shell 2, the sealing mechanism ensures the sealing performance so as to prevent dust from overflowing to pollute the environment when mud slag is discharged, meanwhile, the sealing mechanism also needs to ensure that the rotary drum 1 can reliably and smoothly rotate, the rotary drum 1 can expand or deform when being heated, so that the radial gap between the rotary drum 1 and the blanking cover 81 can change and is dynamic, and the sealing mechanism needs to automatically adapt to the change of the gap and always keep good sealing performance, sealing mechanism specifically can adopt the fish scale to seal, the export of unloading cover 81 is provided with the star type valve, avoids the mud sediment discharge to produce the raise dust polluted environment, the star type valve is connected to sediment cooling device 8's entry, sediment cooling device 8 specifically adopt and press from both sides the cover cooler, adopt water as coolant, the mud sediment is cooled down to 100 ℃ once in sediment cooling device 8, then send into storage tank storage through closing device, transport by the car again and send to cement plant utilization.

The oily sludge treatment system is also provided with an inert gas supply system which is used for conveying inert gas into the rotary drum 1 of the anaerobic distillation system to realize an anaerobic environment, specifically, the inert gas supply system is a nitrogen supply system which is simple to implement and low in cost, nitrogen is introduced into the rotary drum 1 from one end of the discharge hole of the rotary drum 1, specifically, the nitrogen supply system is used for introducing nitrogen into the rotary drum 1 before the anaerobic distillation system starts to operate to discharge air in the rotary drum 1, so that the oxygen content in the rotary drum 1 is reduced to reach a required index to realize the anaerobic environment, the oily sludge is ensured to be subjected to anaerobic distillation, then the nitrogen supply system stops working and starts to work normally, an oxygen concentration detector is arranged in the rotary drum 1 to detect the oxygen concentration in the rotary drum 1 in real time, if the oxygen concentration in the oily sludge treatment system exceeds the standard in the working process, the nitrogen supply system is restarted to feed nitrogen to reduce the oxygen concentration to the desired oxygen-free environment. The nitrogen gas supply system is also provided with a pipeline communicated to the sedimentation separation chamber 7, and nitrogen gas is introduced in multiple ways to discharge air as soon as possible so that the oily sludge treatment system can reach an anaerobic environment. And the nitrogen supply system can also perform purging operation on each device and pipeline of the oily sludge treatment system, clean blockage and scale and ensure long-term and stable operation of the oily sludge treatment system.

The oily sludge treatment method using the oily sludge treatment system comprises the following steps:

the inert gas supply system firstly introduces nitrogen into the rotary drum 1 to exhaust air, and stops after the oxygen concentration in the rotary drum reaches the standard;

the integral starting of the oily sludge treatment system, the oily sludge is fed into the rotary drum 1 from the feed inlet through a screw conveyor, the rotary drum 1 rotates to drive the oily sludge to move along the axial direction of the rotary drum 1, the rotary drum 1 adopts a positive and negative rotation alternating mode, a lifting plate 6 in the rotary drum 1 turns, lifts and collides the oily sludge to crush the oily sludge, a heating system heats the rotary drum 1 to ensure that the oily sludge is subjected to anaerobic distillation separation in the rotary drum 1, and distilled gas and sludge are obtained through separation;

the heating temperature of the whole heating cavity 3 is less than or equal to 450 ℃, chemical change of the oil-containing sludge is avoided, only physical change of water and petroleum hydrocarbon in the oil-containing sludge is caused to be gaseous, specifically, the water in the oil-containing sludge is distilled by heating at the temperature of 100-185 ℃, and then the petroleum hydrocarbon in the oil-containing sludge is distilled by heating at the temperature of 185-450 ℃, so that the water and the petroleum hydrocarbon are respectively and fully evaporated and separated;

the distilled gas firstly enters a settling separation chamber 7 for settling separation treatment, solid particles and liquid drops carried by the distilled gas are removed to obtain primary clean gas, the primary clean gas then enters a condensation separation system for condensation separation treatment to obtain non-condensable gas, liquid oil and wastewater, the non-condensable gas and the liquid oil are supplied to a heating system as fuels, the heat generated by fuel combustion is used for heating and distilling the oily sludge in the rotary drum 1, the non-condensable gas and combustion-supporting gas are preheated by using flue gas generated by combustion through a heat exchanger, and the non-condensable gas and the combustion-supporting gas are preheated and then enter the heating system, so that the combustion sufficiency is improved, and the fuel utilization rate is improved;

and the sludge is cooled and collected for storage.

Example two

The difference from the first embodiment lies in that water is adopted as a cooling medium in both the condenser and the slag cooling device of the condensation separation system, the water absorbs the heat of the distilled gas at the condenser to increase the temperature, meanwhile, the water absorbs the heat of the sludge at the slag cooling device to increase the temperature, the heated water is generally conveyed to a cooling tower to be cooled and then is conveyed to the condenser and the slag cooling device to be recycled, the heat is wasted, a gas-liquid heat exchange device is arranged, the heated water is introduced into the gas-liquid heat exchange device to preheat combustion-supporting gas and non-condensable gas, the heat utilization and the filling rate are improved, the combustion-supporting gas and the non-condensable gas are preheated by the heated water through the gas-liquid heat exchange device, and then the combustion-supporting gas and the non-condensable gas are preheated by flue gas through a heat exchanger, the heat is fully utilized, the energy utilization efficiency is improved, and the fuel utilization rate is improved, The temperature of the combustion-supporting gas, thereby improving the combustion efficiency.

The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.

Claims

1. An oily sludge treatment system is characterized by comprising an anaerobic distillation system and a condensation separation system, the anaerobic distillation system comprises a rotary drum (1) and a shell (2) surrounding the periphery of the rotary drum (1), a space is arranged between the shell (2) and the rotary drum (1) to form a heating cavity (3), a heating system is arranged on the heating cavity (3), oily sludge is heated in the rotary drum (1) to carry out anaerobic distillation, distilled gas generated by the anaerobic distillation is conveyed to a condensation separation system to carry out condensation separation to obtain non-condensable gas, liquid oil and waste water, the non-condensable gas and the liquid oil are used as fuel to be supplied to the heating system to be combusted and heated, the heating chamber (3) is provided with a smoke outlet (31) for discharging smoke, and the non-condensable gas and the combustion-supporting gas are preheated by the smoke through the heat exchanger and then conveyed to the heating system.

2. Oily sludge treatment system according to claim 1, wherein at least two temperature zones with different heating temperatures are included in the rotary drum (1) along the travelling direction of the oily sludge in the rotary drum (1).

3. The oily sludge treatment system according to claim 2, wherein the rotary drum (1) comprises a drying zone for water evaporation and an evaporation zone for petroleum hydrocarbon evaporation arranged in sequence along the traveling direction of the oily sludge in the rotary drum (1).

4. The oily sludge treatment system as claimed in claim 3, wherein the heating temperature of the drying zone is 100-185 ℃, and the heating temperature of the evaporation zone is about 185-450 ℃.

5. The oily sludge treatment system according to claim 1, wherein the housing (2) is arranged in a standing mode, and a sealing mechanism for sealing the heating cavity (3) and ensuring the rotation of the rotary drum (1) is arranged between the housing (2) and the rotary drum (1).

6. The oily sludge treatment system of claim 5 wherein the sealing mechanism is comprised of a combination of several sealing assemblies.

7. The oily sludge treatment system of claim 6 wherein the sealing mechanism is composed of a combination of several sealing components among a spring carbon ring seal, a packing seal, a fish scale seal and a nitrogen seal.

8. The oily sludge treatment system according to claim 7, wherein the spring carbon ring seal comprises graphite blocks (a 1) and springs (a 2), the graphite blocks (a 1) are arranged along the circumferential direction of the rotary drum (1), the springs (a 2) are arranged between the graphite blocks (a 1) and the outer shell (2), the springs (a 2) drive the graphite blocks (a 1) to be tightly attached to the outer wall of the rotary drum (1), and adjacent graphite blocks (a 1) are matched through staggered steps along the axial direction of the rotary drum (1) so that all the graphite blocks (a 1) form a closed ring shape.

9. The oily sludge treatment system according to claim 7, wherein the packing seal comprises a circular correction ring (a 4) and a packing box (a 5), the circular correction ring (a 4) is fixed on the outer wall of the rotary drum (1), the packing box (a 5) is annular and surrounds the circumference of the circular correction ring (a 4), and the packing box (a 5) is filled with packing which is attached to the circular correction ring (a 4).

10. The oily sludge treatment system according to claim 7, wherein the nitrogen seal is formed by introducing nitrogen with preset pressure into the cavities of other seal assemblies through an air pipe (a 9).

11. The oily sludge treatment system according to claim 1 wherein the heating system comprises a burner (4) disposed on the heating chamber (3), combustion-supporting gas and fuel being delivered to the burner (4).

12. The oily sludge treatment system according to claim 11, wherein burners (4) are respectively arranged on two opposite sides of the heating cavity (3), a partition wall (32) is arranged in the heating cavity (3), and the partition wall (32) is positioned in the middle of the connection line of the burners (4) on the two sides.

13. An oily sludge treatment system according to claim 11 wherein the heating system comprises a non-condensable gas conduit (5) communicating with the heating chamber (3), the non-condensable gas passing into the heating chamber (3) through the non-condensable gas conduit (5).

14. The oily sludge treatment system according to claim 1, wherein the outer wall of the rotary drum (1) is provided with a helical blade (11), the helical blade (11) rotates along with the rotary drum (1) to push the flue gas in the heating cavity (3) to move towards one axial end of the rotary drum (1), and the smoke exhaust port (31) is arranged at the other axial end close to the rotary drum (1).

15. The oily sludge treatment system according to claim 14 wherein the helical blade (11) is made of a heat conductive material.

16. The oily sludge treatment system according to claim 1, wherein the inner wall of the rotary drum (1) is provided with a plurality of material raising plates (6) which are distributed at intervals along the circumferential direction.

17. The oily sludge treatment system according to claim 1, further comprising a settling separation chamber (7), wherein the distilled gas enters the settling separation chamber (7) to settle and separate solid particles and liquid drops to obtain a primary clean gas, and the primary clean gas enters the condensation separation system to be subjected to condensation separation.

18. The oily sludge treatment system according to claim 17 wherein the settling separation chamber (7) is provided with a heating device (71).

19. The oily sludge treatment system according to claim 17, wherein the wall surface of the settling separation chamber (7) is provided with an insulating layer (72).

20. The oily sludge treatment system according to claim 1 wherein the sludge produced by the anaerobic distillation system is transported to a sludge cooling device (8) for cooling.

21. The oily sludge treatment system according to claim 1 further comprising an inert gas supply system which delivers inert gas into the rotary drum (1) of the anaerobic distillation system.

22. The method is characterized in that the oily sludge is heated, distilled and separated in an oxygen-free environment to obtain distilled gas and sludge, the distilled gas comprises water vapor and petroleum hydrocarbon gas, the distilled gas is condensed and separated to obtain non-condensable gas, liquid oil and waste water, the non-condensable gas and the liquid oil are used as fuel to be combusted to heat the oily sludge, and the non-condensable gas and combustion-supporting gas required by combustion are preheated by utilizing smoke generated by combustion.

23. The method according to claim 22, wherein the temperature to which the oily sludge is heated is 450 ℃ or lower.

24. The method as claimed in claim 22, wherein the oil-containing sludge is heated at 100-185 ℃ to distill water from the oil-containing sludge, and then heated at 185-450 ℃ to distill petroleum hydrocarbons from the oil-containing sludge.

25. The method according to claim 22, wherein the distilled gas is subjected to a settling separation process to remove solid particles and liquid droplets entrained therein to obtain a primary clean gas, and the primary clean gas is subjected to a condensation separation process.

26. The method for treating oily sludge according to claim 22 wherein the sludge is cooled and collected for storage.