Device and method for pyrolysis gas condensation and synergistic treatment of liquid-containing sludge

Abstract

The embodiment of the present disclosure provides a device and method for pyrolysis gas condensation and treatment of liquid-containing oily sludge, the method comprising: providing liquid-containing oily sludge and pyrolysis gas; and contacting the liquid-containing oily sludge with the pyrolysis gas for heat exchange, so that at least part of the oil phase in the pyrolysis gas is condensed, and at least part of the water phase and at least part of the oil phase in the liquid-containing oily sludge are evaporated, to obtain oil-water vapor and solid-containing oil phase. The method can realize the separation of oil and water without using any chemical agent and without increasing additional energy consumption, and more resources are recovered.

Description

TECHNICAL FIELD

[0001] Embodiments of the present disclosure relate to a device and method for pyrolysis gas condensation and liquid-containing oily sludge treatment. BACKGROUND

[0002] The thermal desorption technology is to heat the oil-containing waste by a heat source, and under anaerobic conditions, the organic matter and water in the oil-containing waste are evaporated and pyrolyzed to form pyrolysis gas, so that the organic matter and water are separated from the solid phase, and the oil resources in the pyrolysis gas are recovered by condensation, realizing the harmless treatment and resource utilization of the oil-containing waste.

[0003] Oily sludge is one of the main pollutants generated in the process of oil and gas field development, refining, gathering and transportation, and storage. The oily sludge is complex in composition, mainly composed of water, clay particles, various oils, asphaltene, bacteria, and toxic and harmful and difficult-to-degrade organic substances, etc. It has serious harm to water sources and soil and can affect the ecological environment and human health. Therefore, the oily sludge must be treated. SUMMARY

[0004] At least one embodiment of the present disclosure provides a method for pyrolysis gas condensation and liquid-containing oily sludge treatment, which comprises: providing liquid-containing oily sludge and pyrolysis gas; contacting the liquid-containing oily sludge with the pyrolysis gas for heat exchange to condense at least part of the oil phase in the pyrolysis gas, and evaporate at least part of the water phase and at least part of the oil phase in the liquid-containing oily sludge, to obtain oil-water vapor and solid-containing oil phase.

[0005] For example, in the method for pyrolysis gas condensation and liquid-containing oily sludge treatment provided by at least one embodiment of the present disclosure, a protective gas is mixed into the liquid-containing oily sludge before the liquid-containing oily sludge is contacted with the pyrolysis gas.

[0006] For example, in the method for pyrolysis gas condensation and liquid-containing oily sludge treatment provided by at least one embodiment of the present disclosure, the flow rate of the liquid-containing oily sludge is adjusted so that the temperature of the obtained oil-water vapor is in the range of 100-200℃.

[0007] For example, in the method for pyrolysis gas condensation and liquid-containing oily sludge treatment provided by at least one embodiment of the present disclosure, the contacting of the liquid-containing oily sludge with the pyrolysis gas for heat exchange comprises: delivering the liquid-containing oily sludge to a liquid inlet of a tank body, delivering the pyrolysis gas to a gas inlet of the tank body, and contacting the liquid-containing oily sludge with the pyrolysis gas in the tank body for heat exchange.

[0008] For example, in the method for pyrolysis gas condensation and liquid-containing oily sludge treatment provided by at least one embodiment of the present disclosure, a sprayer is arranged in the tank body, the sprayer is in communication with the liquid inlet, and the liquid-containing oily sludge is sprayed to the pyrolysis gas by the sprayer to contact the liquid-containing oily sludge with the pyrolysis gas for heat exchange.

[0009] For example, in the method for treating liquid-containing oily sludge by pyrolysis gas condensation provided by at least one embodiment of the present disclosure, at least one of a booster pump and a liquid phase regulating valve is used to regulate the flow of the liquid-containing oily sludge during the process of conveying the liquid-containing oily sludge to the liquid inlet.

[0010] For example, in the method for treating liquid-containing oily sludge by pyrolysis gas condensation provided by at least one embodiment of the present disclosure, the tank body further comprises an exhaust port for discharging the oil-water vapor, a temperature transmitter is arranged in the conveying channel for discharging the oil-water vapor from the exhaust port, and the method further comprises: controlling the temperature of the oil-water vapor to be 100-200°C through interlocking control of the temperature transmitter and the liquid phase regulating valve.

[0011] For example, the method for treating liquid-containing oily sludge by pyrolysis gas condensation provided by at least one embodiment of the present disclosure further comprises: condensing the oil-water vapor to obtain an oil-water mixture and non-condensable gas; separating the oil-water mixture to obtain light oil and oil-containing wastewater; and collecting the non-condensable gas.

[0012] For example, the method for treating liquid-containing oily sludge by pyrolysis gas condensation provided by at least one embodiment of the present disclosure further comprises: performing sedimentation separation on the solid-containing oil phase to obtain heavy oil and an oil-containing solid phase.

[0013] At least one embodiment of the present disclosure further provides a device for treating liquid-containing oily sludge by pyrolysis gas condensation, comprising: a first tank body comprising a first liquid inlet and a first gas inlet; a first pipeline in communication with a liquid-containing oily sludge source and extending to the first liquid inlet; and a second pipeline in communication with a pyrolysis gas source and extending to the first gas inlet; wherein the first pipeline is configured to convey liquid-containing oily sludge obtained from the liquid-containing oily sludge source to the first liquid inlet, the second pipeline is configured to convey pyrolysis gas obtained from the pyrolysis gas source to the first gas inlet, and the liquid-containing oily sludge and the pyrolysis gas contact each other in the first tank body to perform heat exchange.

[0014] For example, the device for treating liquid-containing oily sludge by pyrolysis gas condensation provided by at least one embodiment of the present disclosure further comprises: a booster pump arranged on the first pipeline and a liquid phase regulating valve arranged between the booster pump and the first liquid inlet.

[0015] For example, the device for treating liquid-containing oily sludge by pyrolysis gas condensation provided by at least one embodiment of the present disclosure further comprises a sprayer arranged in the first tank body, wherein the sprayer is in communication with the first liquid inlet, the first liquid inlet and the sprayer are arranged at the upper part of the first tank body, and the first gas inlet is arranged at the lower part of the first tank body.

[0016] For example, in the device for pyrolysis gas condensation and liquid-containing oil sludge treatment provided by at least one embodiment of the present disclosure, the sprayer comprises a plurality of spray heads arranged in one row or multiple rows.

[0017] For example, the device for pyrolysis gas condensation and liquid-containing oil sludge treatment provided by at least one embodiment of the present disclosure further comprises a third pipeline in communication with the protective gas source, wherein the first tank body further comprises a second gas inlet at the top thereof, and the third pipeline extends to the second gas inlet.

[0018] For example, in the device for pyrolysis gas condensation and liquid-containing oil sludge treatment provided by at least one embodiment of the present disclosure, the second gas inlet is in communication between the sprayer and the first liquid inlet, so that the protective gas and the liquid-containing oil sludge are mixed and then delivered to the sprayer.

[0019] For example, the device for pyrolysis gas condensation and liquid-containing oil sludge treatment provided by at least one embodiment of the present disclosure further comprises a condenser, wherein the first tank body comprises a first gas outlet arranged at the top thereof, the condenser comprises a second tank body, the second tank body comprises a third gas inlet, and the first gas outlet is connected to the third gas inlet.

[0020] For example, in the device for pyrolysis gas condensation and liquid-containing oil sludge treatment provided by at least one embodiment of the present disclosure, a temperature transmitter is arranged on the pipeline connecting the first gas outlet and the third gas inlet, and the liquid phase regulating valve and the temperature transmitter are interlocked to control the temperature of the oil-water vapor discharged from the first gas outlet at 100-200℃.

[0021] For example, in the device for pyrolysis gas condensation and liquid-containing oil sludge treatment provided by at least one embodiment of the present disclosure, the condenser further comprises an oil-water separator, the second tank body comprises a first liquid outlet arranged at the bottom thereof, and the oil-water separator comprises a second liquid inlet arranged at the top thereof, and the first liquid outlet and the second liquid inlet are in communication.

[0022] For example, the device for pyrolysis gas condensation and liquid-containing oil sludge treatment provided by at least one embodiment of the present disclosure further comprises an oil separator, wherein the first tank body further comprises a second liquid outlet arranged at the bottom thereof, the oil separator comprises a third liquid inlet, and the second liquid outlet and the third liquid inlet are in communication. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present disclosure, but not limit the present disclosure.

[0024] Figure 1A structural block diagram of a device for pyrolysis gas condensation and liquid-containing oily sludge treatment provided by an embodiment of the present disclosure is provided;

[0025] Figure 2 A structural block diagram of a device for pyrolysis gas condensation and liquid-containing oily sludge treatment provided by another embodiment of the present disclosure is provided;

[0026] Figure 3 A flowchart of a device for pyrolysis gas condensation and liquid-containing oily sludge treatment provided by an embodiment of the present disclosure is provided;

[0027] Figure 4 A flowchart of a device for pyrolysis gas condensation and liquid-containing oily sludge treatment provided by another embodiment of the present disclosure is provided;

[0028] Figure 5 A flowchart of a device for pyrolysis gas condensation and liquid-containing oily sludge treatment provided by another embodiment of the present disclosure is provided;

[0029] Figure 6 A flowchart of a device for pyrolysis gas condensation and liquid-containing oily sludge treatment provided by another embodiment of the present disclosure is provided;

[0030] Figure 7 A flowchart of a device for pyrolysis gas condensation and liquid-containing oily sludge treatment provided by another embodiment of the present disclosure is provided;

[0031] Figure 8 A flowchart of a device for pyrolysis gas condensation and liquid-containing oily sludge treatment provided by another embodiment of the present disclosure is provided;

[0032] Figure 9 A flowchart of a device for pyrolysis gas condensation and liquid-containing oily sludge treatment provided by another embodiment of the present disclosure is provided; and

[0033] Figure 10 A flowchart of a device for pyrolysis gas condensation and liquid-containing oily sludge treatment provided by another embodiment of the present disclosure is provided. DETAILED DESCRIPTION

[0034] In order to make the objectives, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments of the present disclosure. Based on the described embodiments of the present disclosure, all other embodiments obtained by a person of ordinary skill in the art without any inventive effort fall within the scope of protection of the present disclosure.

[0035] Unless otherwise defined, technical terms or scientific terms used in the present disclosure shall have the meanings as commonly understood by one of ordinary skill in the art to which this application belongs. The words "first", "second", and similar words of distinction do not by themselves indicate any order, quantity, or importance, but are used to distinguish one element from another. The words "include" or "contain" and similar words of inclusion mean that the elements or objects before the word encompass the elements or objects listed after the word and their equivalents, without excluding other elements or objects. The words "connect" or "connected" and similar words do not limit to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The words "upper", "lower", "top", "bottom", and the like are used only to indicate relative positional relationships, which can change accordingly when the absolute positions of the described objects change.

[0036] At present, the high-temperature pyrolysis gas generated by thermal desorption is mostly condensed by direct spraying or indirect cooling. When indirect cooling is used, the cooling medium is mostly circulating water or circulating oil in the system. However, the heat released by the condensation of high-temperature pyrolysis gas cannot be effectively utilized, resulting in resource waste. For example, when direct spraying is used, the high-temperature pyrolysis gas is mostly condensed by using settling separation water. At the same time, the circulating settling separation water is also heated by the high-temperature pyrolysis gas. In order to make the settling separation water further circulate, heat exchange equipment and external cooling water are needed to cool the settling separation water, thereby increasing the additional energy consumption. Therefore, it is urgent to optimize the high-temperature pyrolysis gas condensation process to realize the utilization of high-temperature pyrolysis gas waste heat.

[0037] At present, there are many technologies for treating liquid-containing oil sludge, but different problems will exist. For liquid-containing oil sludge with high liquid content, such as oil-containing wastewater scum, aged oil, and oil-containing emulsion, the energy consumption of directly using thermal desorption technology is high, which will cause poor economy; using incineration method not only has low heat utilization rate and requirements for raw material heat value, but also cannot recover petroleum resources, and will produce dust pollution and gas pollution; due to the strong stability of oil-containing wastewater scum, aged oil, and oil-containing emulsion, using conventional concentration, dehydration, and chemical demulsification methods will also make the dehydration process difficult, even if conventional reagents are added, it is also difficult to effectively separate oil and water, and the quality of the recovered oil after reagent treatment is also poor.

[0038] The inventors of the present disclosure notice that the temperature of the high-temperature pyrolysis gas can reach 250-550℃, and if the high-temperature pyrolysis gas is condensed by using circulating water, circulating oil or settlement separation water, etc., the heat of the high-temperature pyrolysis gas cannot be utilized, and the consumption of the circulating water, the circulating oil and the settlement separation water is very large, thereby causing a large amount of resource waste. The inventors of the present disclosure also notice that heating the liquid-containing oil sludge with a high liquid content is beneficial to the recovery of oil resources therein, and therefore, the high-temperature pyrolysis gas can be used to heat the liquid-containing oil sludge, and the liquid-containing oil sludge can be used to condense the high-temperature pyrolysis gas, so that the pyrolysis gas condensation and the treatment of the liquid-containing oil sludge are realized simultaneously, so that the resources are maximized, and resource waste and environmental pollution are avoided. For example, the high-temperature pyrolysis gas can be used to contact the liquid-containing oil sludge to realize heat exchange, so as to condense the high-temperature pyrolysis gas, and at least part of the oil phase in the high-temperature pyrolysis gas is condensed; the liquid-containing oil sludge is heated, so that the water phase and at least part of the oil phase in the liquid-containing oil sludge are evaporated, so that more oil resources can be recovered without increasing additional energy consumption, and the separation of the oil and the water in the liquid-containing oil sludge is realized without using any chemical agent, and the oil resources in the liquid-containing oil sludge are recovered to obtain high-quality oil resources.

[0039] At least one embodiment of the present disclosure provides a device for condensing pyrolysis gas and treating liquid-containing oil sludge simultaneously, for example, Figure 1 A structural block diagram of a device for condensing pyrolysis gas and treating liquid-containing oil sludge simultaneously provided by an embodiment of the present disclosure is shown in Figure 1 The device 1 for condensing pyrolysis gas and treating liquid-containing oil sludge simultaneously includes a first tank body 10, a first pipeline 13 and a second pipeline 14, the first tank body 10 includes a first liquid inlet 11 and a first gas inlet 12. The first pipeline 13 is in communication with a liquid-containing oil sludge source and extends to the first liquid inlet 11, and the second pipeline 14 is in communication with a pyrolysis gas source and extends to the first gas inlet 12. The first pipeline 13 is configured to deliver the liquid-containing oil sludge obtained from the liquid-containing oil sludge source to the first liquid inlet 11, and the second pipeline 14 is configured to deliver the pyrolysis gas obtained from the pyrolysis gas source to the first gas inlet 12. The liquid-containing oil sludge and the pyrolysis gas contact in the first tank body 10 to exchange heat.

[0040] For example, the first pipeline 13 extending to the first liquid inlet 11 means that the first pipeline 13 is in communication with the first liquid inlet 11, and the first pipeline 13 can deliver the liquid-containing oil sludge to the first liquid inlet 11. The second pipeline 14 extending to the first gas inlet 12 means that the second pipeline 14 is in communication with the first gas inlet 12, and the second pipeline 14 can deliver the pyrolysis gas to the first gas inlet 12.

[0041] For example, the liquid-containing sludge is a sludge with fluidity, and the total mass percentage of water and oil in the liquid-containing sludge is 70% to 95%. For example, the mass percentage of water and oil in the liquid-containing sludge is 70%, 75%, 80%, 85%, 90% or 95%, which can ensure that the liquid-containing sludge flows well in the first pipeline 13 and can also ensure that the liquid-containing sludge condenses the pyrolysis gas well.

[0042] For example, the pyrolysis gas is generated by thermal desorption treatment of oil-containing waste. The process of thermal desorption is that the organic pollutants in the oil-containing waste are vaporized and pyrolyzed under high-temperature anaerobic conditions, so that the oil and water in the oil-containing waste are completely separated from the solid phase, and the oil resources are recovered, realizing the harmless treatment and resource utilization of the oil-containing waste. For example, the thermal desorption treatment can be carried out in one or more pyrolysis furnaces, and the temperature of the thermal desorption treatment is controlled at 250°C to 550°C, the time of the thermal desorption is controlled at 0.4 to 3.2h, and the temperature of the pyrolysis gas formed finally is 250 to 550°C. For example, the temperature of the pyrolysis gas is 250°C, 300°C, 350°C, 400°C, 450°C, 500°C or 550°C.

[0043] For example, the heavy oil component in the pyrolysis gas is condensed into a liquid phase, the stability of the liquid-containing sludge is destroyed under the heating action of the pyrolysis gas, the emulsibility is reduced, and the water component and the light oil component in the liquid-containing sludge are heated by the pyrolysis gas to form water vapor and oil vapor. After the liquid-containing sludge is cooled, the uncondensed gas phase in the pyrolysis gas and the oil vapor and water vapor evaporated from the liquid-containing sludge are mixed to form oil-water vapor.

[0044] For example, the first liquid inlet 11 is closer to the top of the first tank body 10 than the first gas inlet 12.

[0045] It should be noted that when the device for condensing pyrolysis gas to cooperatively treat liquid-containing sludge is working normally, the liquid flows in the first direction under the action of gravity, and the surface of the first tank body 10 on the side opposite to the first direction is the top of the first tank body 10, and the surface of the first tank body 10 on the same side as the first direction is the bottom of the first tank body 10.

[0046] For example, the liquid-containing sludge flows downward (i.e. in the direction away from the top of the first tank body 10 within the first tank body 10) after flowing into the first tank body 10 from the first liquid inlet 11 due to the effect of gravity; the pyrolysis gas flows upward (i.e. in the direction close to the top of the first tank body 10 within the first tank body 10) after flowing into the first tank body 10 from the first gas inlet 12 due to the large intermolecular distance of the pyrolysis gas, specifically, the small density. In this way, the liquid-containing sludge input from the first liquid inlet 11 closer to the top of the first tank body 10 flows downward due to the effect of gravity, and the surface thereof in contact with the upward flowing pyrolysis gas input from the first gas inlet 12 is more, so that the liquid-containing sludge and the pyrolysis gas are more fully contacted, and the heat exchange process is more fully.

[0047] It should be noted that the distance from the first gas inlet 12 to the top of the first tank body 10 and the distance from the first liquid inlet 11 to the top of the first tank body 10 can also be substantially equal; or, the first liquid inlet 11 can be farther away from the top of the first tank body 10 than the first gas inlet 12, and the embodiments of the present disclosure do not limit this.

[0048] For example, as shown in Figure 1 The device 1 for condensing pyrolysis gas and cooperatively treating liquid-containing sludge further comprises a booster pump 15 arranged on the first pipeline 13 and a liquid-phase adjusting valve 16 arranged between the booster pump 15 and the first liquid inlet 11. The booster pump 15 and the liquid-phase adjusting valve 16 can both adjust the flow of the liquid-containing sludge.

[0049] For example, the booster pump 15 can adjust the flow of the liquid-containing sludge by accelerating the transmission speed of the liquid-containing sludge, i.e. providing power for the flow of the liquid-containing sludge. The liquid-phase adjusting valve 16 can adjust the flow of the liquid-containing sludge by adjusting the input amount of the liquid-containing sludge, so as to ensure that the liquid-containing sludge is fully contacted with the pyrolysis gas in a sufficient amount. The liquid-phase adjusting valve 16 can also be interlocked with the temperature transmitter mentioned later to control the temperature of the water vapor.

[0050] For example, according to the signal of the adjusting part, the opening degree of the liquid-phase adjusting valve 16 can be automatically controlled, so as to realize the adjustment of the flow of the liquid-containing sludge.

[0051] For example, the liquid-phase adjusting valve 16 comprises an electric adjusting valve, a pneumatic adjusting valve and a hydraulic adjusting valve, etc.

[0052] For example, as shown in Figure 1As shown, the device for treating liquid-containing oil sludge by condensing pyrolysis gas provided by at least one embodiment of the present disclosure further comprises a sprayer 17 arranged in the first tank body 10, the sprayer 17 being in communication with the first liquid inlet 11, the first liquid inlet 11 and the sprayer 17 being arranged at the upper part of the first tank body 10, and the first gas inlet 12 being arranged at the lower part of the first tank body 10. After the liquid-containing oil sludge enters the first liquid inlet 11, it is conveyed to the sprayer 17 in communication with the first liquid inlet 11, and the sprayer 17 is configured to spray the liquid-containing oil sludge to the pyrolysis gas input through the first gas inlet 12. The pyrolysis gas is condensed by the spraying of the sprayer 17, so that the liquid-containing oil sludge and the pyrolysis gas are more fully contacted.

[0053] For example, the first liquid inlet 11 and the sprayer 17 are arranged at the upper part of the first tank body 10, and the first gas inlet 12 is arranged at the lower part of the first tank body 10, so that the liquid-containing oil sludge sprayed from the sprayer 17 can all contact the pyrolysis gas entering from the first gas inlet 12, the pyrolysis gas is fully sprayed and cooled, and the oil and water vapor formed can also rise and be quickly discharged.

[0054] For example, as shown in Figure 1 The first tank body 10 is divided into a first part 101 and a second part 102 along a horizontal center line A-A', the upper part of the first tank body 10 is the first part 101 closer to the top of the first tank body 10, and the lower part of the first tank body 10 is the second part 102 away from the top of the first tank body 10.

[0055] For example, the sprayer 17 comprises a plurality of spray heads 171, and the plurality of spray heads 171 are arranged in one row or multiple rows. As shown in Figure 1 In the structure shown, three spray heads 171 are arranged in one row. For example, more spray heads 171 can also be arranged in one row or multiple rows, so that the area between the first side wall and the second side wall of the first tank body 10 can be sprayed with liquid-containing oil sludge.

[0056] It should be noted that the plurality of spray heads 171 are arranged in multiple rows, which can be that the plurality of spray heads 171 are arranged in multiple rows in the same height plane, or the plurality of spray heads 171 are arranged in multiple rows in different height planes. The plurality of spray heads 171 can be arranged along the circumference of the inner edge of the first tank body 10, or can be arranged only in the center of the first tank body 10, and the embodiments of the present disclosure do not limit this.

[0057] For example, the spray head 171 comprises a multi-head atomizing nozzle, a square nozzle, a high-pressure cleaning nozzle, a hollow cone nozzle, a fan-shaped nozzle, a spiral spray head, etc.

[0058] For example, in some embodiments, the sprayer 17 can also include a spray head 171 which is a multi-head atomizing nozzle or a fan-shaped nozzle, so that the liquid-containing sludge sprayed from the spray head 171 can cover a large enough area to ensure more sufficient contact between the liquid-containing sludge and the pyrolysis gas, so as to make the heat exchange process between the liquid-containing sludge and the pyrolysis gas more sufficient.

[0059] For example, as shown in Figure 1 For example, the pyrolysis gas condensation and liquid-containing sludge treatment device provided by at least one embodiment of the present disclosure further comprises a third pipeline 18 in communication with a protective gas source, and the first tank body 10 further comprises a second gas inlet 19 located at the top of the first tank body 10, and the third pipeline 18 extends to the second gas inlet 19, and the third pipeline 18 is configured to deliver the protective gas from the protective gas source to the second gas inlet 19. The protective gas can prevent the gas volatilized from the liquid-containing sludge under high-temperature conditions or the pyrolysis gas from being oxidized by the oxygen remaining in the first tank body 10 or the oxygen brought in during the delivery of the liquid-containing sludge.

[0060] For example, the extension of the third pipeline 18 to the second gas inlet 19 means that the third pipeline 18 and the second gas inlet 19 are in communication, and the third pipeline 18 can deliver the protective gas to the second gas inlet 19.

[0061] For example, the second gas inlet 19 is located at the top of the first tank body 10, which can facilitate the communication of the second gas inlet 19 to the space between the sprayer 17 and the first liquid inlet 11, can reduce the length of the pipeline in the first tank body 10, and is also conducive to the downward flow of the protective gas to directly mix with the liquid-containing sludge.

[0062] For example, the communication of the second gas inlet 19 to the space between the sprayer 17 and the first liquid inlet 11 can make the protective gas entering from the second gas inlet 19 be delivered to the space between the sprayer 17 and the first liquid inlet 11, so that the liquid-containing sludge entering from the first liquid inlet 11 is mixed with the protective gas first, and then the mixture of the protective gas and the liquid-containing sludge is delivered to the sprayer 17.

[0063] For example, the delivery of the mixture of the protective gas and the liquid-containing sludge to the sprayer 17 can make the contact area of the liquid-containing sludge and the pyrolysis gas larger during spraying, so as to make the heat exchange between the liquid-containing sludge and the pyrolysis gas more sufficient.

[0064] For example, the pyrolysis gas condensation and liquid-containing sludge treatment device further comprises a gas regulating valve 20 arranged on the third pipeline 18, and the gas regulating valve 20 is configured to regulate the flow of the protective gas. For example, according to the signal of the regulating part, the opening degree of the gas regulating valve 20 can be automatically controlled, so as to realize the regulation of the flow of the protective gas.

[0065] For example, the gas regulating valve 20 includes an electric regulating valve, a pneumatic regulating valve, and a hydraulic regulating valve.

[0066] For example, the protective gas is at least one of inert gases such as helium and argon, and nitrogen.

[0067] For example, Figure 2 This is a structural block diagram of an apparatus for the co-processing of liquid sludge by pyrolysis gas condensation, as provided in another embodiment of this disclosure. Figure 2 As shown, the apparatus for co-processing pyrolysis gas condensation with liquid sludge also includes a condenser 21, which can cool the oil and water vapor discharged from the first tank 10. The condenser 21 can cool the oil and water vapor using direct heat exchange or indirect heat exchange. Direct heat exchange includes spraying cooling water directly onto the oil and water vapor; indirect heat exchange includes cooling water in a tubular form or similar method.

[0068] For example, when using indirect heat exchange, the condenser 21 is a partitioned condenser. The condenser 21 includes a second tank 23, which contains a receiving cavity and a cooling medium cavity for heat exchange. The cooling medium flowing in the cooling medium cavity can exchange heat with the oil and water vapor in the receiving cavity, thereby cooling the oil and water vapor in the receiving cavity.

[0069] For example, the second tank 23 also includes a cooling medium inlet and a cooling medium outlet. The cooling medium inlet is connected to a cooling medium source, allowing the low-temperature cooling medium to be delivered into the cooling medium chamber. The cooling medium outlet is also connected to the cooling medium chamber, where the cooling medium flows and exchanges heat with the oil and water vapor within the chamber before flowing out through the cooling medium outlet. After cooling, the cooling medium flowing out of the second tank 23 is returned to the cooling medium chamber for continuous circulation, continuously cooling and condensing the oil and water vapor within the chamber.

[0070] For example, the second tank 23 can be equipped with a serpentine tube or multiple interconnected tubes for the flow of cooling medium. It should be noted that the cooling medium inlet, cooling medium outlet, and cooling pipes can refer to conventional designs and are not limited here.

[0071] For example, such as Figure 2 As shown, the first tank 10 includes a first exhaust port 22 disposed on its top, and the second tank 23 includes a third air inlet 24. The first exhaust port 22 is connected to the third air inlet 24. After the oil and water vapor is discharged from the first exhaust port 22 of the first tank 10, it enters the second tank 23 from the third air inlet 24.

[0072] For example, the cooling medium cavity is located in the middle of the second tank body 23, and the third air inlet 24 and the first liquid outlet 27 can be located at the top and bottom of the second tank body 23 respectively, so that the oil-water vapor can flow from the third air inlet 24 at the top, and can flow downward for condensation, thereby avoiding the oil-water vapor from staying at the top of the second tank body 23; the first liquid outlet 27 at the bottom can make the condensed oil-water mixture completely discharged, thereby avoiding the oil-water mixture from staying in the second tank body 23.

[0073] For example, when the direct heat exchange mode is adopted, the condenser 21 includes the second tank body 23, and the second tank body 23 further includes a cooling medium inlet and a cooling medium outlet. The cooling medium can be cooling water or cooling oil, and the second tank body 23 includes the third air inlet 24, and the first air outlet 22 is connected with the third air inlet 24, so that the oil-water vapor discharged from the first air outlet 22 of the first tank body 10 enters the second tank body 23 from the third air inlet 24. The third air inlet 24 can be located at the lower part of the second tank body 23, and the cooling medium inlet can be located at the upper part of the second tank body 23, so that the cooling medium flows downward and the oil-water vapor flows upward due to the gravity, and the cooling medium can more fully cool the oil-water vapor.

[0074] It should be noted that, as shown in Figure 2 the third air inlet 24 can also be located in the middle of the second tank body 23.

[0075] For example, as shown in Figure 2 a temperature transmitter 25 is further arranged on the pipeline connecting the first air outlet 22 and the third air inlet 24, and the liquid phase adjusting valve 16 and the temperature transmitter 25 are interlocked to control the temperature of the oil-water vapor discharged from the first air outlet 22 to be 100-200℃.

[0076] For example, the temperature transmitter 25 can convert the temperature variation of the oil-water vapor into a standardized output signal that can be transmitted, so as to be used for the measurement and control of the temperature parameter of the oil-water vapor. When the temperature transmitter 25 shows that the temperature of the oil-water vapor is lower than 100℃, the liquid phase adjusting valve 16 can be instructed to reduce the flow of the liquid-containing sludge; when the temperature transmitter 25 shows that the temperature of the oil-water vapor is higher than 200℃, the liquid phase adjusting valve 16 can be instructed to increase the flow of the liquid-containing sludge, so as to realize the interlocking control of the liquid phase adjusting valve 16 and the temperature transmitter 25, thereby making the oil-water vapor entering the condenser subsequently be fully utilized.

[0077] For example, as shown in Figure 2 the condenser 21 further includes an oil-water separator 26, the second tank body 23 includes a first liquid outlet 27 arranged at the bottom thereof, the oil-water separator 26 includes a second liquid inlet 28 arranged at the top thereof, and the first liquid outlet 27 and the second liquid inlet 28 are communicated.

[0078] It should be noted that the "top", "bottom" mentioned above can refer to the similar definition as mentioned above, which will not be repeated here.

[0079] For example, the non-condensable gas in the second tank 23 after cooling and not condensing is purified and used as fuel for the pyrolysis process or enters the waste furnace for disposal.

[0080] For example, at least part of the oil and water vapor in the second tank 23 is condensed to form an oil and water mixture, the temperature of the oil and water mixture is 40-80°C, the oil and water mixture is discharged from the first liquid outlet 27 of the second tank 23, and then enters the oil and water separator 26 from the second liquid inlet 28 in communication with the first liquid outlet 27. Based on the density difference, the oil and water separator 26 separates the light oil and oil-containing wastewater in the oil and water mixture discharged from the second tank 23, recycles and reuses the separated light oil, and transports the separated oil-containing wastewater to the condensation system of the second tank 23 for recycling or discharges into the sewage treatment system.

[0081] For example, the condenser 21 can separate the non-condensable gas, light oil and water, thereby maximizing the recovery of light oil and non-condensable gas in the oil and water vapor to improve the oil recovery rate.

[0082] For example, as shown in Figure 2 The device for condensing pyrolysis gas and cooperatively treating liquid-containing oil sludge further comprises an oil separator 29, and the first tank 10 further comprises a second liquid outlet 30 arranged at the bottom thereof, the oil separator 29 comprises a third liquid inlet 31, and the second liquid outlet 30 and the third liquid inlet 31 are in communication. The heavy oil condensed in the first tank 10 can flow downwardly to the second liquid outlet 30 at the bottom to be discharged.

[0083] For example, the heated heavy oil fraction and solid phase in the liquid-containing oil sludge are mixed with the heavy oil fraction condensed from the pyrolysis gas to form a solid-containing oil phase which enters the oil separator 29. In the oil separator 29, the solid-containing oil phase is separated by sedimentation, the separated heavy oil can be collected by an oil tank for further use, and the separated oil-containing solid phase can be subjected to deep treatment to prevent environmental pollution.

[0084] For example, the first gas outlet 22 and the second liquid outlet 30 are respectively located at the top and the bottom of the first tank 10, so that the rising oil and water vapor and the downwardly flowing heavy oil can completely leave the first tank 10, avoiding stagnation in the first tank 10, so that the oil resource recovery rate is maximized.

[0085] It should be noted that the "top", "bottom" mentioned above can refer to the similar definition as mentioned above, which will not be repeated here.

[0086] For example, in the device for condensing pyrolysis gas and treating liquid-containing oil sludge provided by at least one embodiment of the present disclosure, the surface of the pipeline in contact with the outside world is wrapped with a heat preservation layer, so that the temperature of the medium flowing in the pipeline remains basically unchanged.

[0087] For example, in the device for condensing pyrolysis gas and treating liquid-containing oil sludge provided by an embodiment of the present disclosure, no external heat source needs to be added, and only the pyrolysis gas and liquid-containing oil sludge that need to be recycled are used, so that energy and resources can be maximally utilized, and the harmless treatment of liquid-containing oil sludge and pyrolysis gas, the recycling of pyrolysis gas and oil resources in liquid-containing oil sludge to achieve resource recycling are achieved. The device for condensing pyrolysis gas and treating liquid-containing oil sludge can also realize automatic control and modular design, has a small footprint, is easy to install and move, and can be processed near the contaminated area to reduce the transportation cost of liquid-containing oil sludge.

[0088] At least one embodiment of the present disclosure also provides a method for condensing pyrolysis gas and treating liquid-containing oil sludge, for example, Figure 3 A flowchart of a device for condensing pyrolysis gas and treating liquid-containing oil sludge is provided in an embodiment of the present disclosure. As shown in the figure, the method comprises the following steps. Figure 3

[0089] S01: providing liquid-containing oil sludge and pyrolysis gas;

[0090] S02: contacting the liquid-containing oil sludge with the pyrolysis gas to exchange heat so that at least part of the oil phase in the pyrolysis gas is condensed, and at least part of the water phase and at least part of the oil phase in the liquid-containing oil sludge are evaporated to obtain oil-water vapor and solid oil-containing phase.

[0091] For example, the temperature of pyrolysis gas can generally reach 250-550°C, and if cooling water or cooling oil is specially used to condense high-temperature pyrolysis gas, the heat of the high-temperature pyrolysis gas cannot be fully utilized, and the consumption of cooling water or cooling oil is also very large, thereby causing a large amount of resource waste. Liquid-containing oil sludge with high liquid content needs to be heated to recover oil resources therein, and environmental pollution can also be avoided, so that high-temperature pyrolysis gas is used to heat low-temperature liquid-containing oil sludge, and the low-temperature liquid-containing oil sludge is used to condense the high-temperature pyrolysis gas, so that the pyrolysis gas and the liquid-containing oil sludge are treated simultaneously, so that resources can be maximally utilized and environmental pollution can be avoided.

[0092] ​For example, the high-temperature pyrolysis gas is used to exchange heat with the low-temperature liquid-containing oil sludge, so that the high-temperature pyrolysis gas is condensed, at least part of the oil phase in the high-temperature pyrolysis gas is condensed, the liquid-containing oil sludge is heated, and the water phase and at least part of the oil phase in the liquid-containing oil sludge are evaporated, so that more oil resources can be recovered without increasing energy consumption, and the separation of oil and water can be realized without using any chemical agent, and the oil resources in the liquid-containing oil sludge can be recovered to obtain high-quality oil resources.

[0093] For example, the liquid-containing oil sludge is an oil sludge with fluidity, and the total mass percentage of water and oil in the liquid-containing oil sludge is 70% to 95%. For example, the mass percentage of water and oil in the liquid-containing oil sludge is 70%, 75%, 80%, 85%, 90% or 95%, so that the liquid-containing oil sludge can flow well in the transportation pipeline, and the pyrolysis gas can be well condensed.

[0094] For example, the pyrolysis gas is generated by thermal desorption treatment of oil-containing waste. The process of thermal desorption is that, under the condition of high temperature and anaerobic, the organic pollutants in the oil-containing waste are subjected to evaporation and pyrolysis, so that the oil and water in the oil-containing waste are completely separated from the solid phase, and the oil resources are recovered, and the harmless treatment and resource utilization of the oil-containing waste are realized. For example, the thermal desorption treatment can be performed in one or more pyrolysis furnaces, the temperature of the thermal desorption treatment is controlled to be 250°C to 550°C, the pyrolysis time is controlled to be 0.4h to 3.2h, and the temperature of the finally formed pyrolysis gas is 250°C to 550°C. For example, the temperature of the pyrolysis gas is 250°C, 300°C, 350°C, 400°C, 450°C, 500°C or 550°C.

[0095] For example, the heavy oil component in the pyrolysis gas is condensed into a liquid phase, the stability of the liquid-containing oil sludge is destroyed under the heating action of the pyrolysis gas, the emulsification is reduced, and the water component and the light oil component in the liquid-containing oil sludge are heated by the pyrolysis gas to form water vapor and oil vapor. The uncondensed gas phase in the pyrolysis gas and the oil vapor and water vapor evaporated from the liquid-containing oil sludge are mixed to form oil-water vapor.

[0096] For example, the heat exchange between the liquid-containing oil sludge and the pyrolysis gas includes: conveying the liquid-containing oil sludge to the liquid inlet of the tank body, conveying the pyrolysis gas to the gas inlet of the tank body, and contacting the liquid-containing oil sludge and the pyrolysis gas in the tank body to exchange heat.

[0097] For example, Figure 4 A flow chart of pyrolysis gas condensation and liquid-containing oil sludge treatment according to another embodiment of the present disclosure is shown in FIG. 1. Figure 4 As shown in FIG. 1, the method includes the following steps.

[0098] S11: providing liquid-containing oil sludge and pyrolysis gas;

[0099] S12: mixing the protective gas into the liquid-containing sludge during the process of transporting the liquid-containing sludge before the liquid-containing sludge is contacted with the pyrolysis gas;

[0100] S13: contacting the mixture of the liquid-containing sludge and the protective gas with the pyrolysis gas to exchange heat so that at least part of the oil phase in the pyrolysis gas is condensed, and at least part of the water phase and at least part of the oil phase in the liquid-containing sludge are evaporated, to obtain oil-water vapor and solid-containing oil phase.

[0101] For example, the protective gas can prevent the gas volatilized from the liquid-containing sludge or the pyrolysis gas under high temperature conditions from being oxidized by the oxygen remaining in the tank or the oxygen brought in during the process of transporting the liquid-containing sludge.

[0102] For example, during the process of contacting the mixture of the liquid-containing sludge and the protective gas with the pyrolysis gas to exchange heat, the contact area of the liquid-containing sludge and the pyrolysis gas can be made larger, so that the heat exchange of the liquid-containing sludge and the pyrolysis gas is more sufficient.

[0103] For example, the protective gas is at least one of inert gases such as helium, argon, and nitrogen, and nitrogen.

[0104] For example, Figure 5 A flow chart of the process of condensing pyrolysis gas and cooperatively treating liquid-containing sludge according to another embodiment of the present disclosure is shown in FIG. 2. Figure 5 As shown in FIG. 2, the method comprises the following steps.

[0105] S21: providing the liquid-containing sludge and the pyrolysis gas;

[0106] S22: transporting the liquid-containing sludge and the pyrolysis gas, and adjusting the flow rate of the liquid-containing sludge;

[0107] S23: contacting the liquid-containing sludge with the pyrolysis gas to exchange heat so that at least part of the oil phase in the pyrolysis gas is condensed, and at least part of the water phase and at least part of the oil phase in the liquid-containing sludge are evaporated, to obtain oil-water vapor and solid-containing oil phase, and by adjusting the flow rate of the liquid-containing sludge, the temperature of the obtained oil-water vapor is within the range of 100-200°C.

[0108] For example, at least one of a booster pump and a liquid phase adjusting valve is used to adjust the flow rate of the liquid-containing sludge during the process of transporting the liquid-containing sludge to the liquid inlet. For example, the booster pump can be arranged on the pipeline for transporting the liquid-containing sludge, and the liquid phase adjusting valve can be arranged between the booster pump and the liquid inlet.

[0109] For example, during the process of transporting the liquid-containing sludge to the liquid inlet, the booster pump can be used to provide power for the flow of the liquid-containing sludge, i.e. to apply pressure to the liquid-containing sludge to accelerate the transportation speed of the liquid-containing sludge to adjust the flow rate of the liquid-containing sludge, and the liquid phase adjusting valve can be used to control the opening degree of the valve to adjust the flow rate of the liquid-containing sludge, so as to ensure that there is sufficient amount of the liquid-containing sludge to fully contact with the pyrolysis gas.

[0110] For example, a sprayer can also be arranged in the tank body, and the sprayer is in communication with the liquid inlet. The liquid-containing oil sludge can be sprayed on the pyrolysis gas through the sprayer, so that the liquid-containing oil sludge is in contact with the pyrolysis gas for heat exchange.

[0111] For example, Figure 6 A flow chart for pyrolysis gas condensation and liquid-containing oil sludge treatment provided for another embodiment of the present disclosure is shown in FIG. 4, which includes the following steps. Figure 6

[0112] S31: providing liquid-containing oil sludge and pyrolysis gas;

[0113] S32: delivering the liquid-containing oil sludge to the liquid inlet of the tank body and to the sprayer in communication with the liquid inlet, and delivering the pyrolysis gas to the gas inlet of the tank body;

[0114] S33: spraying the liquid-containing oil sludge on the pyrolysis gas through the sprayer, so that the liquid-containing oil sludge is in contact with the pyrolysis gas for heat exchange, so that at least part of the oil phase in the pyrolysis gas is condensed, and at least part of the water phase and at least part of the oil phase in the liquid-containing oil sludge are evaporated, to obtain oil-water vapor and solid oil phase-containing oil phase.

[0115] For example, the tank body further includes a gas outlet for discharging the oil-water vapor, and a temperature transmitter is arranged in a delivery channel for discharging the oil-water vapor from the gas outlet. The method further includes: controlling the temperature of the oil-water vapor at 100-200℃ through interlocking control of the temperature transmitter and the liquid phase adjusting valve.

[0116] For example, Figure 7 A flow chart for pyrolysis gas condensation and liquid-containing oil sludge treatment provided for another embodiment of the present disclosure is shown in FIG. 4, which includes the following steps. Figure 7

[0117] S41: providing liquid-containing oil sludge and pyrolysis gas;

[0118] S42: delivering the liquid-containing oil sludge and the pyrolysis gas, and adjusting the flow of the liquid-containing oil sludge;

[0119] S43: contacting the liquid-containing oil sludge with the pyrolysis gas for heat exchange to condense at least part of the oil phase in the pyrolysis gas, and evaporate at least part of the water phase and at least part of the oil phase in the liquid-containing oil sludge, to obtain oil-water vapor and solid oil phase-containing oil phase, and controlling the temperature of the oil-water vapor at 100-200℃ through interlocking control of the temperature transmitter and the liquid phase adjusting valve.

[0120] ​​For example, in the process of delivering the liquid-containing sludge to the liquid inlet, a booster pump can be used to provide power for the flow of the liquid-containing sludge, i.e. to apply pressure to the liquid-containing sludge to accelerate the transmission speed of the liquid-containing sludge to regulate the flow of the liquid-containing sludge, and a liquid phase regulating valve can be used to control the opening degree of the valve to regulate the flow of the liquid-containing sludge to ensure that there is sufficient amount of liquid-containing sludge to fully contact the pyrolysis gas.

[0121] For example, the temperature transmitter can convert the temperature variation of the oil-water vapor into a transmissible standardized output signal for the measurement and control of the oil-water vapor temperature parameter. When the temperature transmitter shows that the temperature of the oil-water vapor is lower than 100℃, the liquid phase regulating valve can be instructed to reduce the flow of the liquid-containing sludge; when the temperature transmitter shows that the temperature of the oil-water vapor is higher than 200℃, the liquid phase regulating valve can be instructed to increase the flow of the liquid-containing sludge to realize the interlocked control of the liquid phase regulating valve and the temperature transmitter, so that the oil-water vapor entering the condenser subsequently can be fully utilized.

[0122] For example, Figure 8 A flow chart of a method for pyrolysis gas condensation and liquid-containing sludge treatment according to another embodiment of the present disclosure is shown in FIG. 6, which comprises the following steps. Figure 8

[0123] S51: providing liquid-containing sludge and pyrolysis gas;

[0124] S52: contacting the liquid-containing sludge with the pyrolysis gas for heat exchange to condense at least part of the oil phase in the pyrolysis gas, and to evaporate at least part of the water phase and at least part of the oil phase in the liquid-containing sludge to obtain oil-water vapor and solid-containing oil phase;

[0125] S53: condensing the oil-water vapor to obtain oil-water mixture and non-condensable gas;

[0126] S54: separating the oil-water mixture to obtain light oil and oil-containing wastewater, and collecting the non-condensable gas;

[0127] S55: settling and separating the solid-containing oil phase to obtain heavy oil and oil-containing solid phase.

[0128] For example, when the above process is completed in the device for pyrolysis gas condensation and liquid-containing sludge treatment as shown in FIG. 6, the method for pyrolysis gas condensation and liquid-containing sludge treatment comprises using a condenser to condense the oil-water vapor, the condenser comprising a second tank body and an oil-water separator, delivering the oil-water vapor to the second tank body, cooling the oil-water vapor to 40℃-80℃ in the second tank body to obtain oil-water mixture and non-condensable gas; delivering the oil-water mixture to the oil-water separator to obtain light oil and oil-containing wastewater; and collecting the non-condensable gas at the same time. Figure 2

[0129] ​​For example, the cooling of the oil-water vapor in the second tank body includes cooling the oil-water vapor by direct heat exchange or indirect heat exchange. The direct heat exchange includes spraying the oil-water vapor with oil or water. The indirect heat exchange includes cooling the oil-water vapor with a cooling water column or the like.

[0130] For example, based on the density difference, the oil-water separator separates the light oil and the oily wastewater from the oil-water mixture discharged from the second tank body, recycles and reuses the separated light oil, and transports the separated oily wastewater to the condensing system of the second tank body for recycling or discharging into a sewage treatment system. The condenser can separate the non-condensable gas, the light oil, and the water, thereby maximizing the recovery of the oil in the oil-water vapor to improve the oil resource recovery rate.

[0131] For example, the method of condensing pyrolysis gas and cooperatively treating liquid-containing oil sludge further includes separating the heavy oil and the oil-containing solid phase by using an oil separator. The separated heavy oil can be collected by using an oil storage tank for further use. The separated oil-containing solid phase is subjected to deep treatment.

[0132] For example, Figure 9 A flowchart of a method of condensing pyrolysis gas and cooperatively treating liquid-containing oil sludge is provided for another embodiment of the present disclosure. For example, Figure 9 The method of condensing pyrolysis gas and cooperatively treating liquid-containing oil sludge is completed in a device as shown in Figure 2 The method is completed in a device as shown in Figure 9 The method includes the following steps.

[0133] S61: providing liquid-containing oil sludge, pyrolysis gas, and protective gas;

[0134] S62: transporting the pyrolysis gas to the first gas inlet of the first tank body;

[0135] S63: applying pressure to the liquid-containing oil sludge by using a booster pump, adjusting the flow of the liquid-containing oil sludge by using a liquid phase adjusting valve, and transporting the liquid-containing oil sludge to the first liquid inlet of the first tank body;

[0136] S64: inputting the protective gas from the second gas inlet and transmitting the protective gas to the sprayer between the first liquid inlet;

[0137] S65: mixing the liquid-containing oil sludge and the protective gas, and transporting the mixed liquid-containing oil sludge and protective gas to the sprayer;

[0138] S66: spraying the mixture of the liquid-containing oil sludge and the protective gas on the pyrolysis gas by using the sprayer, so that the liquid-containing oil sludge contacts the pyrolysis gas for heat exchange to condense at least part of the oil phase in the pyrolysis gas, and at least part of the water phase and at least part of the oil phase in the liquid-containing oil sludge evaporate to obtain oil-water vapor and solid oil phase.

[0139] For example, the method for treating the liquid-containing oil sludge by condensing pyrolysis gas also includes spraying the liquid-containing oil sludge to the pyrolysis gas by using the sprayer 17 located in the first tank 10, the sprayer 17 is communicated with the first liquid inlet 11, the first liquid inlet 11 and the sprayer 17 are located at the upper part of the first tank 10, and the first gas inlet 12 is located at the lower part of the first tank 10.

[0140] For example, the first tank 10 also includes the second gas inlet 19 located at the top of the first tank 10, the second gas inlet 19 is communicated between the sprayer 17 and the first liquid inlet 11, and the protective gas entering from the second gas inlet 19 is mixed with the liquid-containing oil sludge and then delivered to the sprayer 17. The second gas inlet 19 is located at the top of the first tank 10, which can facilitate the communication between the second gas inlet 19 and the sprayer 17 and the first liquid inlet 11, can reduce the length of the pipeline located in the first tank 10, and is also conducive to the downward flow of the protective gas and the direct mixing with the liquid-containing oil sludge.

[0141] For example, the protective gas is transmitted by the third pipeline 18 extending and communicated to the second gas inlet 19, and the gas regulating valve 20 is also arranged on the third pipeline 18, and the gas regulating valve 20 can be used to adjust the flow of the protective gas. For example, according to the signal of the adjusting part, the opening degree of the gas regulating valve 20 can be automatically controlled, so as to realize the adjustment of the flow of the protective gas.

[0142] For example, Figure 10 A flow chart of the method for treating the liquid-containing oil sludge by condensing pyrolysis gas is provided for another embodiment of the present disclosure. For example, Figure 10 The method for treating the liquid-containing oil sludge by condensing pyrolysis gas is completed in the device as shown in the figure. Figure 2 The method as shown in the figure includes the following steps. Figure 10 The method as shown in the figure includes the following steps.

[0143] S71: providing the liquid-containing oil sludge, the pyrolysis gas and the protective gas;

[0144] S72: delivering the pyrolysis gas to the first gas inlet of the first tank;

[0145] S73: applying pressure to the liquid-containing oil sludge by using the booster pump, adjusting the flow of the liquid-containing oil sludge by using the liquid phase regulating valve, and delivering the liquid-containing oil sludge to the first liquid inlet of the first tank;

[0146] S74: inputting the protective gas from the second gas inlet, transmitting the protective gas between the sprayer and the first liquid inlet, mixing the liquid-containing oil sludge and the protective gas, and delivering the mixed liquid-containing oil sludge and protective gas to the sprayer;

[0147] S75: spraying the mixture of the liquid-containing sludge and the protective gas to the pyrolysis gas by using a sprayer, so that the liquid-containing sludge is contacted with the pyrolysis gas to exchange heat, so that at least part of the oil phase in the pyrolysis gas is condensed, and at least part of the water phase and at least part of the oil phase in the liquid-containing sludge are evaporated, so as to obtain oil-water vapor and solid-containing oil phase;

[0148] S76: controlling the temperature of the oil-water vapor to be 100-200℃ by interlocking control of the temperature transmitter and the liquid phase adjusting valve between the first exhaust port of the first tank body and the third gas inlet of the second tank body included in the condenser;

[0149] S77: transmitting the oil-water vapor from the first exhaust port to the third gas inlet to enter the second tank body, cooling the oil-water vapor to 40-80℃ to obtain an oil-water mixture and non-condensable gas, collecting the non-condensable gas, and delivering the oil-water mixture to the oil-water separator included in the condenser;

[0150] S78: separating the light oil and the oil-containing wastewater in the oil-water separator based on the density difference;

[0151] S79: discharging the solid-containing oil phase from the second liquid outlet at the bottom of the first tank body, and delivering the solid-containing oil phase to the oil separator to separate the heavy oil and the oil-containing solid phase by sedimentation.

[0152] For example, the device for condensing the pyrolysis gas and cooperatively treating the liquid-containing sludge further comprises a condenser 21, and the first tank body 10 further comprises a first exhaust port 22 at the top thereof, and the oil-water vapor is discharged from the first exhaust port 22 to the condenser 21; the condenser 21 comprises a second tank body 23, and the second tank body 23 comprises a third gas inlet 24, and the first exhaust port 22 is in communication with the third gas inlet 24; the temperature of the oil-water vapor is controlled to be 100-200℃ by interlocking control of the temperature transmitter 25 and the liquid phase adjusting valve 16 between the first exhaust port 22 and the third gas inlet 24.

[0153] For example, the method further comprises: delivering the oil-water vapor to the second tank body 23, cooling the oil-water vapor to 40-80℃ in the second tank body 23 to obtain an oil-water mixture and non-condensable gas; delivering the oil-water mixture to the oil-water separator 26 included in the condenser 21 to obtain light oil and oil-containing wastewater; and collecting the non-condensable gas.

[0154] For example, the cooling of the oil-water vapor in the second tank body 23 comprises cooling the oil-water vapor by direct heat exchange or indirect heat exchange, the direct heat exchange comprises directly spraying the oil or water to the oil-water vapor, and the indirect heat exchange comprises cooling the oil-water vapor by using a cooling water column or the like.

[0155] For example, when the indirect heat exchange is adopted, the condenser 21 is a partition condenser, which comprises a second tank 23, and the second tank 23 is provided with a containing cavity and a cooling medium cavity capable of heat exchange. The cooling medium flowing in the cooling medium cavity can exchange heat with the gas in the containing cavity, so that the oil-water vapor in the containing cavity is cooled.

[0156] For example, the second tank 23 further comprises a cooling medium inlet and a cooling medium outlet. The cooling medium inlet is communicated with a cooling medium source, and the low-temperature cooling medium is delivered into the cooling medium cavity. The cooling medium outlet is communicated with the cooling medium cavity, and the cooling medium flows in the cooling medium cavity and exchanges heat with the oil-water vapor in the containing cavity, and then flows out through the cooling medium outlet. The cooling medium flowing out of the second tank 23 is cooled, and is sent back to the cooling medium cavity to flow circularly, so as to continuously cool and condense the oil-water vapor in the containing cavity.

[0157] For example, the first tank 10 comprises a first exhaust port 22 arranged at the top of the first tank 10, and the second tank 23 comprises a third air inlet 24, and the first exhaust port 22 is connected with the third air inlet 24. The oil-water vapor is discharged from the first exhaust port 22 of the first tank 10, and then enters the second tank 23 from the third air inlet 24.

[0158] For example, the cooling medium cavity is located in the middle of the second tank 23, and the third air inlet 24 and the first liquid outlet 27 can be located at the top and the bottom of the second tank 23 respectively, so that the oil-water vapor flows into the third air inlet 24 at the top and flows downward to be condensed, and the oil-water vapor is prevented from staying at the top of the second tank 23; the first liquid outlet 27 located at the bottom can make the condensed oil-water mixture flow out completely, and the oil-water mixture is prevented from staying in the second tank 23.

[0159] For example, when the direct heat exchange is adopted, the condenser 21 comprises a second tank 23, and the second tank 23 further comprises a cooling medium inlet and a cooling medium outlet. The cooling medium can be water or oil, the second tank 23 comprises a third air inlet 24, and the first exhaust port 22 is connected with the third air inlet 24. The oil-water vapor is discharged from the first exhaust port 22 of the first tank 10, and then enters the second tank 23 from the third air inlet 24. The third air inlet 24 can be located at the lower part of the second tank 23, and the cooling medium inlet can be located at the upper part of the second tank 23, so that the cooling medium flows downward and the oil-water vapor flows upward due to the gravity, and the cooling medium can more fully cool the oil-water vapor.

[0160] For example, based on the density difference, the oil-water separator 26 separates the light oil and the oily wastewater from the oil-water mixture discharged from the second tank body 23, recycles and reuses the separated light oil, and transports the separated oily wastewater to the condensing system of the second tank body 23 for recycling or discharging into a sewage treatment system.

[0161] For example, the condenser 21 can separate the non-condensable gas, the light oil, and the water, thereby maximizing the recovery of the crude oil in the oil-water vapor to improve the recovery rate of the oil resources.

[0162] For example, the method for pyrolysis gas condensation and synergistic treatment of liquid-containing oily sludge further includes: discharging a solid-containing oil phase from a second liquid discharge port 30 located at the bottom of the first tank body 10, and transporting the solid-containing oil phase to an oil separator 29 to settle and separate heavy oil and oil-containing solid phase.

[0163] For example, the oil separator 29 includes a third liquid inlet port 31, and the second liquid discharge port 30 and the third liquid inlet port 31 are communicated. The solid-containing oil phase formed by mixing the heated heavy oil fraction and the solid phase in the liquid-containing oily sludge and the heavy oil fraction condensed from the pyrolysis gas can flow downward to the second liquid discharge port 30 at the bottom to enter the oil separator 29. In the oil separator 29, the solid-containing oil phase is settled and separated, the separated heavy oil can be collected by an oil storage tank for further use, and the separated oil-containing solid phase is subjected to deep treatment.

[0164] For example, the first gas discharge port 22 and the second liquid discharge port 30 are respectively located at the top and the bottom of the first tank body 10, so that the rising oil-water vapor and the flowing heavy oil can completely leave the first tank body 10, avoiding stagnation in the first tank body 10.

[0165] The device and method for pyrolysis gas condensation and synergistic treatment of liquid-containing oily sludge provided by the embodiments of the present disclosure have at least one of the following beneficial effects:

[0166] (1) The method for pyrolysis gas condensation and synergistic treatment of liquid-containing oily sludge provided by at least one embodiment of the present disclosure uses high-temperature pyrolysis gas to contact and exchange heat with the liquid-containing oily sludge, so as to realize condensation of the liquid-containing oily sludge on the high-temperature pyrolysis gas and heating of the liquid-containing oily sludge by the high-temperature pyrolysis gas. At least part of the oil phase in the high-temperature pyrolysis gas is condensed, and at least part of the oil phase in the liquid-containing oily sludge is volatilized, thereby saving resources.

[0167] (2) The method for pyrolysis gas condensation and synergistic treatment of liquid-containing oily sludge provided by at least one embodiment of the present disclosure realizes separation of oil and water without using any chemical agent and without increasing additional energy consumption, thereby recovering more oil resources.

[0168] (3) The method for treating liquid-containing oil sludge by pyrolysis gas condensation provided by at least one embodiment of the present disclosure can make the contact area of the liquid-containing oil sludge and the pyrolysis gas larger when the mixture of the protective gas and the liquid-containing oil sludge is sprayed, so that the heat exchange between the liquid-containing oil sludge and the pyrolysis gas is more sufficient.

[0169] (4) The device for treating liquid-containing oil sludge by pyrolysis gas condensation provided by at least one embodiment of the present disclosure can make the liquid-containing oil sludge flow away from the top of the first tank body under the action of gravity, and the pyrolysis gas flow towards the top, so that the contact surface between the pyrolysis gas and the liquid-containing oil sludge is larger, and the contact between the liquid-containing oil sludge and the pyrolysis gas is more sufficient, and the heat exchange process is more sufficient.

[0170] (5) The device for treating liquid-containing oil sludge by pyrolysis gas condensation provided by at least one embodiment of the present disclosure can control the temperature of the oil-water vapor discharged from the first exhaust port at 100-200 DEG C through the interlocking control of the liquid phase regulating valve and the temperature transmitter, so that the oil-water vapor can be sufficiently condensed after entering the condenser, and the oil-water vapor entering the condenser can be fully utilized.

[0171] The following points need to be explained:

[0172] (1) The drawings of the embodiments of the present disclosure only involve the structures involved in the embodiments of the present disclosure, and other structures can be referred to the general design.

[0173] (2) For the sake of clarity, the thickness of a layer or region is exaggerated or reduced in the drawings used to describe the embodiments of the present disclosure, i.e., these drawings are not drawn according to the actual proportion. It can be understood that when an element such as a layer, a film, a region or a substrate is referred to as being located "on" or "under" another element, the element can be "directly" located on or under another element, or there can be an intermediate element.

[0174] (3) In the case of no conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0175] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A method for condensing pyrolysis gas to cooperatively treat liquid-containing oil sludge, comprising: providing liquid-containing oil sludge and pyrolysis gas; contacting the liquid-containing oil sludge with the pyrolysis gas to exchange heat so that at least part of oil phase in the pyrolysis gas is condensed, at least part of water phase and at least part of oil phase in the liquid-containing oil sludge are evaporated, to obtain oil-water vapor and solid-containing oil phase; wherein, contacting the liquid-containing oil sludge with the pyrolysis gas to exchange heat comprises: contacting the liquid-containing oil sludge with the pyrolysis gas to exchange heat by spraying the liquid-containing oil sludge to the pyrolysis gas; mixing heated heavy oil fraction and solid phase in the liquid-containing oil sludge with condensed heavy oil fraction in the pyrolysis gas to form solid-containing oil phase, and performing settling separation on the solid-containing oil phase to obtain heavy oil and oil-containing solid phase; and adjusting flow of the liquid-containing oil sludge by using at least one of booster pump and liquid phase regulating valve during conveying the liquid-containing oil sludge to liquid inlet of the tank; the tank further comprises gas outlet for discharging the oil-water vapor, temperature transmitter is arranged in conveying passage of the oil-water vapor discharged from the gas outlet, and the method further comprises: controlling temperature of the oil-water vapor at 100℃-200℃ by interlocking control of the temperature transmitter and the liquid phase regulating valve; the interlocking control of the temperature transmitter and the liquid phase regulating valve comprises: instructing the liquid phase regulating valve to reduce flow of the liquid-containing oil sludge when the temperature transmitter shows that temperature of the oil-water vapor is lower than 100℃; and instructing the liquid phase regulating valve to increase flow of the liquid-containing oil sludge when the temperature transmitter shows that temperature of the oil-water vapor is higher than 200℃.

2. The method of claim 1, wherein, mixing protective gas into the liquid-containing oil sludge before contacting the liquid-containing oil sludge with the pyrolysis gas.

3. The method of claim 1 or 2, wherein, contacting the liquid-containing oil sludge with the pyrolysis gas to exchange heat further comprises: conveying the pyrolysis gas to gas inlet of the tank, and contacting the liquid-containing oil sludge with the pyrolysis gas in the tank to exchange heat.

4. The method of claim 3, wherein, the tank is provided with sprayer which communicates with the liquid inlet, and the liquid-containing oil sludge is sprayed to the pyrolysis gas by the sprayer to contact the liquid-containing oil sludge with the pyrolysis gas to exchange heat. 5.The method according to claim 1 or 2, further comprising: performing condensation treatment on the oil-water vapor to obtain oil-water mixture and non-condensable gas; performing oil-water separation on the oil-water mixture to obtain light oil and oil-containing wastewater; and collecting the non-condensable gas. 6.An apparatus for condensing pyrolysis gas to cooperatively treat liquid-containing oil sludge, comprising: first tank comprising first liquid inlet and first gas inlet; first pipeline which communicates with liquid-containing oil sludge source and extends to the first liquid inlet; second pipeline which communicates with pyrolysis gas source and extends to the first gas inlet; booster pump arranged on the first pipeline and liquid phase regulating valve arranged between the booster pump and the first liquid inlet; wherein the first pipeline is configured to convey liquid-containing oil sludge obtained from the liquid-containing oil sludge source to the first liquid inlet, the second pipeline is configured to convey pyrolysis gas obtained from the pyrolysis gas source to the first gas inlet, and the liquid-containing oil sludge and the pyrolysis gas contact to exchange heat in the first tank; ​ The device for pyrolysis gas condensation and liquid-containing sludge treatment further comprises a condenser, wherein the first tank body comprises a first exhaust port arranged at the top thereof, the condenser comprises a second tank body, the second tank body comprises a third gas inlet, and the first exhaust port is connected with the third gas inlet. A temperature transmitter is arranged on a pipeline connecting the first exhaust port with the third gas inlet, and the liquid-phase adjusting valve and the temperature transmitter are interlocked to control the temperature of the oil-water vapor discharged from the first exhaust port to be 100-200°C. The interlocked control of the temperature transmitter and the liquid-phase adjusting valve comprises: when the temperature transmitter shows that the temperature of the oil-water vapor is lower than 100°C, the liquid-phase adjusting valve is instructed to reduce the flow of the liquid-containing sludge; and when the temperature transmitter shows that the temperature of the oil-water vapor is higher than 200°C, the liquid-phase adjusting valve is instructed to increase the flow of the liquid-containing sludge. The device further comprises an oil separator, wherein the first tank body further comprises a second liquid outlet arranged at the bottom thereof, the oil separator comprises a third liquid inlet, and the second liquid outlet and the third liquid inlet are communicated.

7. The apparatus for condensing pyrolysis gas and co-treating liquid-containing sludge according to claim 6, further comprising a sprayer provided in the first tank body, wherein, The spray device is connected with the first liquid inlet, and the first liquid inlet and the spray device are arranged at the upper part of the first tank body, and the first gas inlet is arranged at the lower part of the first tank body.

8. The apparatus for condensation of pyrolysis gas in co-processing of liquid-containing sludge according to claim 7, wherein, The spray device comprises a plurality of spray heads arranged in one row or a plurality of rows.

9. The apparatus for condensing pyrolysis gas in conjunction with treatment of liquid-containing sludge according to claim 7, further comprising a third conduit in communication with a source of a shielding gas, wherein, The first tank body further comprises a second gas inlet arranged at the top thereof, and the third pipeline extends to the second gas inlet.

10. The apparatus for condensation of pyrolysis gas in co-processing of liquid-containing sludge according to claim 9, wherein, The second gas inlet is communicated between the spray device and the first liquid inlet, so that the protective gas and the liquid-containing sludge are mixed and then delivered to the spray device.

11. The apparatus for pyrolysis gas condensation and co-treatment of liquid-containing sludge of claim 10, wherein, The condenser further comprises an oil-water separator, the second tank body comprises a first liquid outlet arranged at the bottom thereof, and the oil-water separator comprises a second liquid inlet arranged at the top thereof, and the first liquid outlet and the second liquid inlet are communicated.

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