Pyrolysis oil-gas separation and solid residue recycling device

Abstract

The utility model provides a pyrolysis oil-gas separation and solid residue recycling device which comprises an oil-gas recovery tower, a first solid-liquid separation device, a second solid-liquid separation device, a first solid conveying device, a second solid conveying device, a conveying pump and a rotary kiln, a first scraping plate is arranged at the tower bottom of the oil-gas recovery tower, and a tower bottom outlet is connected with the rotary kiln through the first solid conveying device. An outlet in the side face of the bottom of the oil gas recovery tower is connected with a first solid-liquid separation device, a solid residue outlet of the oil gas recovery tower is connected with the rotary kiln through a second solid conveying device, a tar outlet of the oil gas recovery tower is connected with a second solid-liquid separation device through a conveying pump, and a second scraper is arranged in the first solid-liquid separation device. According to the utility model, the scrapers are arranged at the bottom of the oil gas recovery tower and in the filter, so that solid slag can be cleaned in time, equipment blockage is effectively prevented, the equipment can stably run for a long period, and solid slag recycling is realized; by arranging the centrifugal machine, solid slag accumulation can be avoided, and the tar quality is guaranteed; the device is simple in structure, reasonable in design, low in treatment cost and high in economic benefit.

Description

Technical Field

[0001] This utility model belongs to the field of coal chemical technology and relates to a device for separating pyrolysis oil and gas and recovering solid slag. Background Technology

[0002] Coal pyrolysis-based fractional utilization technology has advantages such as high energy conversion efficiency, low carbon emissions, low water consumption, and clean and efficient operation. It has become the most promising technical route and practical direction for coal conversion and utilization, and is receiving increasing attention.

[0003] Coal pyrolysis technology converts raw coal into pyrolysis products such as coal gas, tar, and fine coke through a specific process. After gas-solid separation, the oil and gas products need to be separated using an oil and gas recovery tower. The fractionation tower is a key piece of equipment for oil and gas recovery. Pyrolysis oil and gas carry fine coke into the bottom of the fractionation tower. Due to the poor fluidity of the bottom oil, the fine coke settles at the bottom of the fractionation tower and cannot be extracted with the bottom oil for filtration and separation. At the same time, if the small amount of solid residue in the extracted bottom tar is not cleaned in time in the filter, the solid residue content at the bottom of the fractionation tower and in the filter pipes will increase over time, adhering to the tower walls and pipes and continuously forming coke. Therefore, coking in the fractionation tower has always been a major factor restricting the safe, stable, and long-term operation of oil and gas recovery units.

[0004] The traditional method for recovering bottom tar from oil and gas recovery towers involves installing a coke filter at the bottom. However, due to the poor fluidity of the bottom oil, severe powder carryover is common, leading to tower blockage and preventing long-term operation. Therefore, effective methods are urgently needed to prevent coking and blockage in oil and gas recovery towers. Furthermore, the solid residue separated by the coke filter is hazardous waste with high treatment costs, necessitating measures to recover and reuse the solid residue from the tar.

[0005] CN 114921268A discloses a device and method for purifying high-temperature dust-laden oil and gas and recovering semi-coke from pulverized coal pyrolysis. The device includes a high-temperature electrostatic precipitator for gas-solid separation and fine dust removal of the pyrolysis oil and gas, yielding clean pyrolysis oil and gas. The separated pyrolysis semi-coke is conveyed to a water-cooled screw conveyor via a scraper conveyor. The water-cooled screw conveyor cools the pyrolysis semi-coke to 380–420°C. A receiving tank receives the pyrolysis semi-coke from the water-cooled screw conveyor and transports it to a combustion boiler for secondary utilization. This device focuses on the transportation and heat recovery of the pyrolysis semi-coke after gas-solid separation, rather than the solid-liquid separation of the tar-carrying coke after oil and gas condensation and the prevention of coking and blockage. It deals with tar residue differently.

[0006] CN 206143131U discloses a rapid pyrolysis coal tar processing system, which includes a primary fractionation unit, a hydrocracking unit, a filtration unit, and a coking unit connected in sequence. The primary fractionation unit has a bottom oil outlet, the hydrocracking unit has a bottom oil inlet and a hydrogenation product outlet, the filtration unit has a hydrogenation product inlet and a solid residue outlet, and the coking unit has a solid residue inlet and a coke outlet. This system focuses on the fractionation of coal tar, but does not provide additional treatment for the coke powder and solid residue that may be present in the bottom oil. Although a filtration unit is set after the hydrocracking unit, this filtration unit is for processing the hydrogenation product, not the bottom oil. Even the solid residue contained in the hydrogenation product is directly fed into the coking unit, without considering the problem of solid residue accumulation and blockage.

[0007] In summary, the treatment equipment for tar after pyrolysis oil and gas fractionation focuses on the recovery and utilization of solid residue in the tar and the prevention of equipment and pipeline blockage caused by solid residue coking. This aims to achieve safe, stable, and long-term operation of the equipment, as well as the recovery and utilization of waste energy, simplifying the treatment process and reducing treatment costs. Utility Model Content

[0008] To address the problems existing in the prior art, the purpose of this utility model is to provide a device for pyrolysis oil and gas separation and solid slag recycling. The device performs fractionation and filtration separation of pyrolysis oil and gas, and cleans the solid slag at the bottom of the tower and the bottom of the filter by setting scrapers to prevent clogging of the oil and gas recovery tower, enabling the device to operate stably for a long period of time, and sending the solid slag into a rotary kiln for recycling, thereby achieving the effects of waste reuse and energy recovery.

[0009] To achieve this objective, the present invention adopts the following technical solution:

[0010] This utility model provides an apparatus for separating pyrolysis oil and gas and recovering solid slag. The apparatus includes an oil and gas recovery tower, a first solid-liquid separation device, a first solid conveying device, a second solid conveying device, a conveying pump, a second solid-liquid separation device, and a rotary kiln. The bottom of the oil and gas recovery tower is provided with a first scraper. The bottom outlet of the oil and gas recovery tower is connected to the inlet of the rotary kiln via the first solid conveying device. The side outlet of the bottom of the oil and gas recovery tower is connected to the inlet of the first solid-liquid separation device. The first solid-liquid separation device is provided with a second scraper. The solid slag outlet of the first solid-liquid separation device is connected to the inlet of the rotary kiln via the second solid conveying device. The tar outlet of the first solid-liquid separation device is connected to the inlet of the second solid-liquid separation device via the conveying pump. The solid slag outlet of the second solid-liquid separation device is connected to the inlet of the rotary kiln.

[0011] In this invention, after the oil and gas products generated by the coal pyrolysis process are condensed and recovered using an oil and gas recovery tower, the coke residue carried in the tar at the bottom of the tower is separated by a filter. If it is not cleaned in time, it can easily cause solid residue accumulation and coking, as well as equipment and pipeline blockage. Therefore, this invention sets scrapers at the bottom of the oil and gas recovery tower and in the solid-liquid separation filter to clean the solid residue adhering to the bottom of the tower and the filter in time, reducing the risk of solid residue accumulation and effectively preventing the blockage of the oil and gas recovery tower, enabling it to operate stably for a long period of time. The cleaned solid residue is transported to the rotary kiln for pyrolysis, achieving the effect of waste reuse and energy recovery. After the filtered tar is pumped, a centrifuge for solid-liquid separation is set up to separate the trace amounts of unfiltered solid residue, avoiding its accumulation in the tank area and ensuring the quality of the tar product. The device has a simple structure, reasonable design, good solid residue treatment effect, helps to reduce processing costs, and has high economic benefits.

[0012] The following are preferred technical solutions of this utility model, but are not intended to limit the technical solutions provided by this utility model. Through the following technical solutions, the technical objectives and beneficial effects of this utility model can be better achieved and realized.

[0013] As a preferred technical solution of this utility model, a pyrolysis device and a gas-solid separation device are also provided before the inlet of the oil and gas recovery tower. The upper outlet of the pyrolysis device is connected to the inlet of the gas-solid separation device, and the gas phase outlet of the gas-solid separation device is connected to the lower inlet of the oil and gas recovery tower.

[0014] As a preferred technical solution of this utility model, the pyrolysis device includes a pulverized coal pyrolysis furnace or a lump coal pyrolysis furnace, and the gas-solid separation device includes a cyclone separator.

[0015] In this invention, the source of the pyrolysis oil and gas is a coal pyrolysis device. In addition to the commonly used pyrolysis furnace, a rotary kiln can also be used as a pyrolysis device. The pyrolysis products enter the oil and gas recovery tower through a cyclone separator for condensation and recovery.

[0016] As a preferred technical solution of this utility model, the oil and gas recovery tower includes a fractionation tower, wherein the first scraper is fixed at the middle position of the bottom of the fractionation tower and extends outward to contact the tower wall.

[0017] In this invention, a scraper is installed at the bottom of the fractionation tower. The scraper continuously cleans the solid slag adhering to the bottom and wall of the tower. Under the action of the scraper, the blockage of the oil and gas recovery tower can be effectively prevented. The solid slag is transported to the rotary kiln for pyrolysis through a conveying device, and the generated oil and gas can also enter the oil and gas recovery tower.

[0018] As a preferred technical solution of this utility model, the first solid-liquid separation device includes a filter, the filter is provided with a filter screen, and the filtration accuracy of the filter screen is 0.01 to 10 mm, such as 0.01 mm, 0.05 mm, 0.075 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.8 mm, 1 mm, 3 mm, 5 mm or 10 mm, etc., but is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0019] As a preferred technical solution of this utility model, the second scraper is fixed at the middle position of the bottom of the filter and contacts the inner wall of the filter.

[0020] In this invention, the tar extraction line at the bottom of the oil and gas recovery tower is located on the side of the tower bottom, rather than at the bottom, and the bottom can be used to discharge solid slag; a scraper is installed in the filter to clean the inside of the filter in real time, and at the same time transport the cleaned solid slag to the rotary kiln. The whole process is automated, reducing the difficulty of operation for workers.

[0021] As a preferred technical solution of this utility model, both the first solid conveying device and the second solid conveying device include a screw conveyor.

[0022] As a preferred technical solution of this utility model, the outlet pipeline on the bottom side of the oil and gas recovery tower includes at least one, such as one, two or three, etc. When the outlet pipeline includes two or more branches, the branches are arranged in parallel, and each branch is equipped with a first solid-liquid separation device and a second solid conveying device.

[0023] In this utility model, the selection of the number of tar extraction pipelines and filters in the oil and gas recovery tower is mainly based on the processing capacity of the oil and gas recovery tower and filters, as well as the ability to ensure that the filters can operate alternately. If the amount of tar is large, a single filter cannot filter and separate it in time, so multiple branches are designed. In addition, the filters are equipped with scrapers and screw feeders. As they are moving equipment, multiple filters are set up for easy switching during maintenance.

[0024] As a preferred technical solution of this utility model, the second solid-liquid separation device includes a centrifuge, the solid slag outlet of the centrifuge is connected to the inlet of the rotary kiln, and the tar outlet of the centrifuge is transported to the tank area or returned to the oil and gas recovery tower.

[0025] In this invention, a centrifuge is installed at the outlet of the delivery pump to separate trace amounts of unfiltered solid residue from the tar, reducing the accumulation of solid residue in the tank area products. The separated solid residue is also transported to the rotary kiln by a conveying device. If a return pipeline is designed to return part of the tar separated by the centrifuge to the oil and gas recovery tower, the turbulence of the tar at the bottom of the tower can be enhanced, and the solid content in the tar at the bottom of the tower can be reduced, making the tar liquid flow smoother.

[0026] As a preferred technical solution of this utility model, the device further includes a buffer tank, which is located before the rotary kiln. The bottom outlet of the oil and gas recovery tower, the solid slag outlet of the first solid-liquid separation device, and the solid slag outlet of the second solid-liquid separation device are all connected to the inlet of the buffer tank, and the outlet of the buffer tank is connected to the inlet of the rotary kiln.

[0027] In this invention, the solid residue separated by the oil and gas recovery tower, filter, and centrifuge can all first enter the buffer tank and then be transported to the rotary kiln.

[0028] As a preferred technical solution of this utility model, the oil and gas outlet of the rotary kiln is connected to the inlet of the oil and gas recovery tower, and the oil and gas recovery tower is the same as or a separate oil and gas recovery tower corresponding to the pyrolysis device.

[0029] In this invention, the solid slag enters the rotary kiln for pyrolysis. The raw material in the rotary kiln should not be entirely solid slag; it needs to be mixed with a portion of coal, and the proportion of coal should not be less than 50%, such as 50%, 55%, 60%, 65%, 70%, or 75%. The oil and gas treatment of the rotary kiln can be achieved by using an oil and gas recovery tower that is matched with the pyrolysis furnace. If the pressure difference between the pyrolysis furnace and the rotary kiln is large, the rotary kiln can be equipped with a separate oil and gas recovery system, but the centrifuge at the bottom of the tower can be shared.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] (1) The device described in this utility model performs fractionation recovery and filtration separation of pyrolysis oil and gas, and scrapers are installed at the bottom of the oil and gas recovery tower and in the filter to clean the solid slag adhering to the bottom of the tower and the filter in a timely manner, reducing the risk of solid slag accumulation, effectively preventing the clogging of the oil and gas recovery tower and the filter, so that it can operate stably for a long period of time. The cleaned solid slag is transported to the rotary kiln for pyrolysis to achieve the effect of waste reuse and energy recovery.

[0032] (2) In this utility model, after the filtered tar is pumped, a centrifuge is set up to separate the trace amount of unfiltered solid residue, so as to avoid its accumulation in the tank area and ensure the quality of the tar product.

[0033] (3) The device described in this utility model has a simple structure and reasonable design, which can realize the rapid treatment of solid slag, help reduce treatment costs, and has high economic benefits. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of the pyrolysis oil and gas separation and solid slag recycling device provided in Embodiment 1 of this utility model;

[0035] Among them, 1-pyrolysis device, 2-gas-solid separation device, 3-oil-gas recovery tower, 4-1-first scraper, 4-2-second scraper, 5-first solid-liquid separation device, 6-1-first solid conveying device, 6-2-second solid conveying device, 7-transfer pump, 8-second solid-liquid separation device, 9-rotary kiln, 10-buffer tank. Detailed Implementation

[0036] To better illustrate this utility model and facilitate understanding of its technical solution, the present utility model is further described in detail below. However, the following embodiments are merely simplified examples of this utility model and do not represent or limit the scope of protection of this utility model. The scope of protection of this utility model is determined by the claims.

[0037] The following are typical but non-limiting embodiments of this utility model:

[0038] Example 1:

[0039] This embodiment provides a device for pyrolysis oil and gas separation and solid slag recovery and utilization. A schematic diagram of the device is shown below. Figure 1 As shown, the system includes an oil and gas recovery tower 3, a first solid-liquid separation device 5, a first solid conveying device 6-1, a second solid conveying device 6-2, a conveying pump 7, a second solid-liquid separation device 8, and a rotary kiln 9. The bottom of the oil and gas recovery tower 3 is equipped with a first scraper 4-1. The bottom outlet of the oil and gas recovery tower 3 is connected to the inlet of the rotary kiln 9 via the first solid conveying device 6-1. The side outlet of the bottom of the oil and gas recovery tower 3 is connected to the inlet of the first solid-liquid separation device 5. The first solid-liquid separation device 5 is equipped with a second scraper 4-2. The solid slag outlet of the first solid-liquid separation device 5 is connected to the inlet of the rotary kiln 9 via the second solid conveying device 6-2. The tar outlet of the first solid-liquid separation device 5 is connected to the inlet of the second solid-liquid separation device 8 via the conveying pump 7. The solid slag outlet of the second solid-liquid separation device 8 is connected to the inlet of the rotary kiln 9.

[0040] The oil and gas recovery tower 3 is also equipped with a pyrolysis device 1 and a gas-solid separation device 2 before the inlet. The upper outlet of the pyrolysis device 1 is connected to the inlet of the gas-solid separation device 2, and the gas phase outlet of the gas-solid separation device 2 is connected to the lower inlet of the oil and gas recovery tower 3.

[0041] The pyrolysis device 1 is a pulverized coal pyrolysis furnace, and the gas-solid separation device 2 is a cyclone separator.

[0042] The oil and gas recovery tower 3 is a fractionation tower, and the first scraper 4-1 is fixed at the middle position of the bottom of the fractionation tower and extends outward to contact the tower wall.

[0043] The first solid-liquid separation device 5 is a filter, and the filter is equipped with a filter screen with a filtration accuracy of 0.075 mm.

[0044] The second scraper 4-2 is fixed at the middle position of the bottom of the filter and contacts the inner wall of the filter.

[0045] Both the first solid conveying device 6-1 and the second solid conveying device 6-2 are screw conveyors.

[0046] The outlet pipeline on the bottom side of the oil and gas recovery tower 3 includes two branches, which are connected in parallel. Each branch is equipped with a first solid-liquid separation device 5 and a second solid conveying device 6-2.

[0047] The second solid-liquid separation device 8 is a centrifuge. The solid slag outlet of the centrifuge is connected to the inlet of the rotary kiln 9, and the tar from the outlet of the centrifuge is transported to the tank area.

[0048] The device also includes a buffer tank 10, which is located before the rotary kiln 9. The bottom outlet of the oil and gas recovery tower 3, the solid slag outlet of the first solid-liquid separation device 5, and the solid slag outlet of the second solid-liquid separation device 8 are all connected to the inlet of the buffer tank 10. The outlet of the buffer tank 10 is connected to the inlet of the rotary kiln 9.

[0049] The oil and gas outlet of the rotary kiln 9 is connected to the inlet of the oil and gas recovery tower 3, and the oil and gas recovery tower 3 is the same as the oil and gas recovery tower 3 corresponding to the pyrolysis device 1.

[0050] Example 2:

[0051] This embodiment provides an apparatus for pyrolysis oil and gas separation and solid slag recovery. The apparatus includes an oil and gas recovery tower 3, a first solid-liquid separation device 5, a first solid conveying device 6-1, a second solid conveying device 6-2, a conveying pump 7, a second solid-liquid separation device 8, and a rotary kiln 9. The bottom of the oil and gas recovery tower 3 is provided with a first scraper 4-1. The bottom outlet of the oil and gas recovery tower 3 is connected to the inlet of the rotary kiln 9 via the first solid conveying device 6-1. The side outlet of the bottom of the oil and gas recovery tower 3 is connected to the inlet of the first solid-liquid separation device 5. The first solid-liquid separation device 5 is provided with a second scraper 4-2. The solid slag outlet of the first solid-liquid separation device 5 is connected to the inlet of the rotary kiln 9 via the second solid conveying device 6-2. The tar outlet of the first solid-liquid separation device 5 is connected to the inlet of the second solid-liquid separation device 8 via the conveying pump 7. The solid slag outlet of the second solid-liquid separation device 8 is connected to the inlet of the rotary kiln 9.

[0052] The oil and gas recovery tower 3 is also equipped with a pyrolysis device 1 and a gas-solid separation device 2 before the inlet. The upper outlet of the pyrolysis device 1 is connected to the inlet of the gas-solid separation device 2, and the gas phase outlet of the gas-solid separation device 2 is connected to the lower inlet of the oil and gas recovery tower 3.

[0053] The pyrolysis device 1 is a lump coal pyrolysis furnace, and the gas-solid separation device 2 is a cyclone separator.

[0054] The oil and gas recovery tower 3 is a fractionation tower, and the first scraper 4-1 is fixed at the middle position of the bottom of the fractionation tower and extends outward to contact the tower wall.

[0055] The first solid-liquid separation device 5 is a filter, and the filter is equipped with a filter screen with a filtration accuracy of 0.3 mm.

[0056] The second scraper 4-2 is fixed at the middle position of the bottom of the filter and contacts the inner wall of the filter.

[0057] Both the first solid conveying device 6-1 and the second solid conveying device 6-2 are screw conveyors.

[0058] The outlet pipeline on the bottom side of the oil and gas recovery tower 3 includes two branches, which are connected in parallel. Each branch is equipped with a first solid-liquid separation device 5 and a second solid conveying device 6-2.

[0059] The second solid-liquid separation device 8 is a centrifuge. The solid slag outlet of the centrifuge is connected to the inlet of the rotary kiln 9. The tar from the outlet of the centrifuge is transported to the tank area, and another outlet pipeline is connected to the oil and gas recovery tower 3.

[0060] The oil and gas outlet of the rotary kiln 9 is connected to the inlet of the oil and gas recovery tower 3. The oil and gas recovery tower 3 is not the same as the oil and gas recovery tower 3 corresponding to the pyrolysis device 1, but is a separately set oil and gas recovery tower.

[0061] Example 3:

[0062] This embodiment provides an apparatus for pyrolysis oil and gas separation and solid slag recovery. The apparatus includes an oil and gas recovery tower 3, a first solid-liquid separation device 5, a first solid conveying device 6-1, a second solid conveying device 6-2, a conveying pump 7, a second solid-liquid separation device 8, and a rotary kiln 9. The bottom of the oil and gas recovery tower 3 is provided with a first scraper 4-1. The bottom outlet of the oil and gas recovery tower 3 is connected to the inlet of the rotary kiln 9 via the first solid conveying device 6-1. The side outlet of the bottom of the oil and gas recovery tower 3 is connected to the inlet of the first solid-liquid separation device 5. The first solid-liquid separation device 5 is provided with a second scraper 4-2. The solid slag outlet of the first solid-liquid separation device 5 is connected to the inlet of the rotary kiln 9 via the second solid conveying device 6-2. The tar outlet of the first solid-liquid separation device 5 is connected to the inlet of the second solid-liquid separation device 8 via the conveying pump 7. The solid slag outlet of the second solid-liquid separation device 8 is connected to the inlet of the rotary kiln 9.

[0063] The oil and gas recovery tower 3 is also equipped with a pyrolysis device 1 and a gas-solid separation device 2 before the inlet. The upper outlet of the pyrolysis device 1 is connected to the inlet of the gas-solid separation device 2, and the gas phase outlet of the gas-solid separation device 2 is connected to the lower inlet of the oil and gas recovery tower 3.

[0064] The pyrolysis device 1 is a pulverized coal pyrolysis furnace, and the gas-solid separation device 2 is a cyclone separator.

[0065] The oil and gas recovery tower 3 is a fractionation tower, and the first scraper 4-1 is fixed at the middle position of the bottom of the fractionation tower and extends outward to contact the tower wall.

[0066] The first solid-liquid separation device 5 is a filter, and the filter is equipped with a filter screen with a filtration accuracy of 1 mm.

[0067] The second scraper 4-2 is fixed at the middle position of the bottom of the filter and contacts the inner wall of the filter.

[0068] Both the first solid conveying device 6-1 and the second solid conveying device 6-2 are screw conveyors.

[0069] The oil and gas recovery tower 3 has an outlet pipeline on the side of the bottom, and a set of first solid-liquid separation device 5 and second solid conveying device 6-2 are installed on the outlet pipeline.

[0070] The second solid-liquid separation device 8 is a centrifuge. The solid slag outlet of the centrifuge is connected to the inlet of the rotary kiln 9. The tar from the outlet of the centrifuge is transported to the tank area, and another outlet pipeline is connected to the oil and gas recovery tower 3.

[0071] The device also includes a buffer tank 10, which is located before the rotary kiln 9. The bottom outlet of the oil and gas recovery tower 3, the solid slag outlet of the first solid-liquid separation device 5, and the solid slag outlet of the second solid-liquid separation device 8 are all connected to the inlet of the buffer tank 10. The outlet of the buffer tank 10 is connected to the inlet of the rotary kiln 9.

[0072] The oil and gas outlet of the rotary kiln 9 is connected to the inlet of the oil and gas recovery tower 3, and the oil and gas recovery tower 3 is the same as the oil and gas recovery tower 3 corresponding to the pyrolysis device 1.

[0073] The apparatus described in the above embodiments is used for pyrolysis oil and gas separation and solid slag recovery, specifically including:

[0074] After coal pyrolysis, the pyrolysis products are separated by a cyclone separator to obtain pyrolysis oil and gas, which then enters an oil and gas recovery tower for condensation and recovery. The bottom of the oil and gas recovery tower is equipped with a first scraper to continuously clean the solid slag adhering to the bottom and walls of the tower. The solid slag is then conveyed to a rotary kiln via a screw conveyor. The tar extracted from the bottom of the tower enters a filter, which is equipped with a second scraper to continuously clean the solid slag filtered out. This solid slag is also transported to the rotary kiln for pyrolysis, reducing the risk of solid slag accumulation. This allows the oil and gas recovery tower and filter to operate safely, stably, and for a long period of time, achieving the effect of pyrolysis utilization of solid slag waste and energy recovery.

[0075] A centrifuge is installed at the outlet of the transfer pump to separate the small amount of solid residue remaining in the tar after passing through the filter. The outlet tar is sent to the tank area, and the separated solid residue is sent to the rotary kiln for pyrolysis. The oil and gas generated by the rotary kiln pyrolysis can also enter the oil and gas recovery tower for separation and recovery.

[0076] As can be seen from the above embodiments, the device of this utility model performs fractionation recovery and filtration separation of pyrolysis oil and gas. Scrapers are installed at the bottom of the oil and gas recovery tower and in the filter to promptly clean the solid slag adhering to the bottom of the tower and the filter, reducing the risk of solid slag accumulation and effectively preventing clogging of the oil and gas recovery tower and filter, enabling long-term stable operation. The cleaned solid slag is transported to a rotary kiln for pyrolysis, achieving waste reuse and energy recovery. After filtration, the tar is pumped and then centrifuged to separate trace amounts of unfiltered solid slag, preventing its accumulation in the tank area and ensuring the quality of the tar product. The device has a simple structure and reasonable design, enabling rapid solid slag processing, helping to reduce processing costs and achieving high economic benefits.

[0077] The applicant declares that this utility model is illustrated through the above embodiments, but it is not limited to the above-described detailed device, meaning that this utility model does not necessarily rely on the above-described detailed device to be implemented. Those skilled in the art should understand that any improvements to this utility model, equivalent substitutions for the device, additions of auxiliary devices, and selection of specific methods, etc., all fall within the protection and disclosure scope of this utility model.

Claims

1. A device for separating pyrolysis oil and gas and recovering solid slag, characterized in that, The apparatus includes an oil and gas recovery tower, a first solid-liquid separation device, a first solid conveying device, a second solid conveying device, a conveying pump, a second solid-liquid separation device, and a rotary kiln. The bottom of the oil and gas recovery tower is equipped with a first scraper. The bottom outlet of the oil and gas recovery tower is connected to the inlet of the rotary kiln via the first solid conveying device. The side outlet of the bottom of the oil and gas recovery tower is connected to the inlet of the first solid-liquid separation device. The first solid-liquid separation device is equipped with a second scraper. The solid slag outlet of the first solid-liquid separation device is connected to the inlet of the rotary kiln via the second solid conveying device. The tar outlet of the first solid-liquid separation device is connected to the inlet of the second solid-liquid separation device via the conveying pump. The solid slag outlet of the second solid-liquid separation device is connected to the inlet of the rotary kiln.

2. The apparatus for pyrolysis oil and gas separation and solid slag recovery according to claim 1, characterized in that, The oil and gas recovery tower is also equipped with a pyrolysis device and a gas-solid separation device before the inlet. The upper outlet of the pyrolysis device is connected to the inlet of the gas-solid separation device, and the gas phase outlet of the gas-solid separation device is connected to the lower inlet of the oil and gas recovery tower.

3. The apparatus for pyrolysis oil and gas separation and solid slag recovery according to claim 2, characterized in that, The pyrolysis device includes a pulverized coal pyrolysis furnace or a lump coal pyrolysis furnace, and the gas-solid separation device includes a cyclone separator.

4. The apparatus for pyrolysis oil and gas separation and solid slag recovery according to claim 1, characterized in that, The oil and gas recovery tower includes a fractionation tower, and the first scraper is fixed at the middle position of the bottom of the fractionation tower and extends outward to contact the tower wall.

5. The apparatus for pyrolysis oil and gas separation and solid slag recovery according to claim 1, characterized in that, The first solid-liquid separation device includes a filter, and the filter is provided with a filter screen, the filter screen having a filtration accuracy of 0.01 to 10 mm; The second scraper is fixed at the middle of the bottom of the filter and contacts the inner wall of the filter.

6. The apparatus for pyrolysis oil and gas separation and solid slag recovery according to claim 1, characterized in that, Both the first solid conveying device and the second solid conveying device include a screw conveyor.

7. The apparatus for pyrolysis oil and gas separation and solid slag recovery according to claim 1, characterized in that, The outlet pipeline on the bottom side of the oil and gas recovery tower includes at least one outlet pipeline. When the outlet pipeline includes two or more branches, the branches are connected in parallel, and each branch is equipped with a first solid-liquid separation device and a second solid conveying device.

8. The apparatus for pyrolysis oil and gas separation and solid slag recovery according to claim 1, characterized in that, The second solid-liquid separation device includes a centrifuge, the solid slag outlet of which is connected to the inlet of the rotary kiln, and the tar outlet of the centrifuge is transported to the tank farm or returned to the oil and gas recovery tower.

9. The apparatus for pyrolysis oil and gas separation and solid slag recovery according to claim 8, characterized in that, The device also includes a buffer tank, which is located before the rotary kiln. The bottom outlet of the oil and gas recovery tower, the solid slag outlet of the first solid-liquid separation device, and the solid slag outlet of the second solid-liquid separation device are all connected to the inlet of the buffer tank. The outlet of the buffer tank is connected to the inlet of the rotary kiln.

10. The apparatus for pyrolysis oil and gas separation and solid slag recovery according to claim 2, characterized in that, The oil and gas outlet of the rotary kiln is connected to the inlet of the oil and gas recovery tower. The oil and gas recovery tower is the same as the oil and gas recovery tower corresponding to the pyrolysis unit or is a separate oil and gas recovery tower.

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