Coal direct liquefaction pitch lock slag discharge device and on-line slag discharge method

Abstract

The present application provides a coal direct liquefaction pitch lock slag discharge device and an online slag discharge method. The device comprises a vertical slag collecting tank, a lock slag discharge valve and a horizontal slag storage tank. The bottom of the vertical slag collecting tank is connected with one end of the lock slag discharge valve, and the other end of the lock slag discharge valve is connected with the horizontal slag storage tank. An inlet pipeline and an outlet pipeline are respectively arranged on the side wall of the vertical slag collecting tank. A first filter screen is arranged in the vertical slag collecting tank. The first filter screen is used to store the filtered waste slag in the inner cavity of the vertical slag collecting tank, and discharge the waste slag into the horizontal slag storage tank through the lock slag discharge valve. The present application realizes online slag discharge of coal direct liquefaction pitch, reduces the production operation steps after the coal direct liquefaction pitch is blocked, reduces the work intensity, and improves the safety operation coefficient of the device.

Description

Technical Field

[0001] This invention belongs to the field of coal chemical industry, specifically relating to a coal direct liquefaction bitumen slag-locking and slag-discharging device and an online slag-discharging method. Background Technology

[0002] Coal direct liquefaction bitumen is produced by vacuum distillation of the reaction products during the coal direct liquefaction process. Due to incomplete reaction, coal direct liquefaction bitumen contains small coke particles, unreacted coal powder, insufficiently reacted coal powder, coke deposits formed by condensation, mineral sediments, and catalyst powder, among other waste residues. Coal direct liquefaction bitumen is generally transported through pipelines to the inlet filter of the bitumen pump, and after filtration, it is pumped by the bitumen pump to the downstream molding system.

[0003] Because coal direct liquefaction bitumen contains the aforementioned waste residue, the residue causes blockage of the bitumen pump inlet filter during transportation, leading to pump cavitation. Current methods can only address this by switching bitumen pumps. However, this method has the following problems: the bitumen pump switching process is complex and prone to damage; it also requires a large amount of flushing oil, affecting the formation of coal direct liquefaction bitumen; the bitumen filter switching and cleaning process is time-consuming, resulting in untimely bitumen delivery; and high material levels at the bottom of the pressure reducing tower affect the system load. Summary of the Invention

[0004] To address the aforementioned problems in the existing technology, this invention provides a coal direct liquefaction bitumen slag-locking and slag-discharging device and an online slag-discharging method. By achieving online slag discharge of coal direct liquefaction bitumen without switching the bitumen pump, it reduces operational risks, decreases the amount of flushing oil used, avoids the impact of the flushing process on the system load, and ensures the safe and stable operation of the device.

[0005] One object of the present invention is to provide a coal direct liquefaction bitumen slag-locking and slag-discharging device, comprising a vertical slag collecting tank, a slag-locking and slag-discharging valve, and a horizontal slag storage tank. The vertical slag collecting tank has an inlet pipeline and an outlet pipeline respectively provided on its side wall. The interior of the vertical slag collecting tank is provided with a first filter screen, a first hollow circular plate, and a first open circular plate. The first filter screen is a first hollow cylindrical barrel with an open inclined surface at its upper end, and the side wall of the barrel is a filter screen structure. The upper open inclined surface of the first hollow cylindrical barrel coincides with the opening of the first open circular plate. The lower side of the open inclined surface of the first hollow cylindrical barrel faces the inlet pipeline of the vertical slag collecting tank and is lower than the lowest point of the inlet pipeline. At its lowest point, the high side of the inclined surface of the opening of the first hollow cylindrical barrel faces the outlet pipeline of the vertical slag collecting tank and is higher than the highest point of the outlet pipeline; the bottom of the first hollow cylindrical barrel is detachably connected to the first hollow circular plate, and the hollow diameter of the first hollow circular plate is smaller than the hollow diameter of the first hollow cylindrical barrel; the first hollow circular plate and the bottom of the vertical slag collecting tank have an inverted frustum-shaped structure, forming an inner cavity for slag collection; the bottom of the vertical slag collecting tank is connected to one end of the slag-locking and slag-discharging valve, and the other end of the slag-locking and slag-discharging valve is connected to the horizontal slag storage tank; the side wall of the vertical slag collecting tank is also provided with a first heat transfer oil inlet and a first heat transfer oil outlet.

[0006] In some embodiments, the other end of the inlet pipeline of the vertical slag collection tank is connected to the coal liquefaction pressure reducing tower, and the other end of the outlet pipeline is connected to the asphalt pump. Valves are respectively installed at the inlet and outlet pipelines of the vertical slag collection tank, and a heat transfer oil heating system is installed along the entire length of the inlet and outlet pipelines of the vertical slag collection tank.

[0007] In some embodiments, the vertical slag collection tank is provided with a first vent valve at the top.

[0008] In some embodiments, the slag discharge valve is one of a slide valve, a gate valve, and a ball valve, preferably a slide valve.

[0009] In some embodiments, a flushing oil pipeline is also connected to the inlet pipeline of the vertical slag collection tank, and the distance between the flushing oil pipeline and the outlet valve at the bottom of the coal liquefaction pressure reducing tower is ≤100cm, preferably ≤50cm, and more preferably ≤30cm.

[0010] In some embodiments, the horizontal slag storage tank is provided with a second filter screen inside, which is used to receive and store the waste slag in the inner cavity of the vertical slag collection tank; the side wall of the horizontal slag storage tank is also provided with a second heat transfer oil inlet and a second heat transfer oil outlet.

[0011] In some embodiments, the interior of the horizontal slag storage tank is further equipped with a second hollow circular plate and a second open circular plate. The second filter screen is a second hollow cylindrical barrel with an open inclined surface at the feed end, and the barrel wall is a filter screen structure. The bottom of the second hollow cylindrical barrel is detachably connected to the second hollow circular plate, and the hollow diameter of the second hollow circular plate is smaller than the hollow diameter of the second hollow cylindrical barrel. The open inclined surface at the feed end of the second hollow cylindrical barrel coincides with the opening of the second open circular plate. The short side of the open inclined surface of the second hollow cylindrical barrel faces the material inlet of the horizontal slag collection tank, and the short side does not coincide with the material inlet. The long side of the open inclined surface of the second hollow cylindrical barrel faces the material outlet of the horizontal slag collection tank, and the long side completely covers the material outlet. A drain port is installed on the side of the horizontal slag storage tank near the second hollow circular plate, and a second vent valve is installed on the side of the horizontal slag storage tank near the second open circular plate.

[0012] In some embodiments, the aperture of the first filter screen is φ10-25mm, preferably φ15-20mm.

[0013] In some embodiments, the aperture of the second filter screen is φ10-25mm, preferably φ15-20mm.

[0014] Another object of the present invention is to provide an online slag discharge method for the above-mentioned coal direct liquefaction asphalt conveying slag and slag discharge device, comprising the following steps:

[0015] S1. Flushing process: Turn on the heat transfer oil heating system; when the asphalt pump runs dry or does not produce material, close the outlet valve at the bottom of the coal liquefaction pressure reducing tower, open the flushing oil pipeline for pipeline flushing, and after flushing is completed, stop the asphalt pump and close the valves on the flushing oil pipeline and the inlet and outlet pipelines of the vertical slag collection tank.

[0016] S2. Slag Locking and Discharge Process: Open the slag locking and discharge valve to discharge slag. After completion, close the slag locking and discharge valve, then open the valves on the inlet and outlet pipelines of the vertical slag collection tank and start the asphalt pump.

[0017] S3. Slag removal process: Close the second heat transfer oil inlet and the second heat transfer oil outlet. After the horizontal slag storage tank cools down to below 100°C, the sludge oil in the horizontal slag storage tank is discharged through the drain outlet. After confirming that the pressure of the horizontal slag storage tank is at normal pressure through the second vent valve, remove the second filter screen, clean it, and reinstall it.

[0018] In some embodiments, before step S2, the temperature of the heat transfer oil entering from the second heat transfer oil inlet and exiting from the second heat transfer oil outlet is controlled so that the temperature of the horizontal slag storage tank is lower than the temperature of the vertical slag collection tank, and the temperature difference is ≤60℃, preferably 10℃≤temperature difference≤50℃, and more preferably 25℃≤temperature difference≤35℃.

[0019] In some embodiments, in step S1, the temperature of the heat transfer oil tracing system is 300-320℃, preferably 310-320℃, and more preferably 310-315℃; the flushing oil pipeline uses high-temperature, low-pressure flushing oil with a temperature of 300-330℃ and a pressure of 2.0-2.5MPa; and / or,

[0020] In step S2, the slag-locking and slag-discharging valve is initially opened to 1 to 3 turns. After the pressure between the vertical slag collection tank and the horizontal slag storage tank is equalized, the slag-locking and slag-discharging valve is fully opened to complete the slag discharge.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] This invention installs a vertical slag collection tank on the pipeline between the coal liquefaction pressure reducing tower and the asphalt pump. A first filter screen is installed inside the vertical slag collection tank to store the filtered waste residue from direct coal liquefaction asphalt within its inner cavity. The waste residue is then discharged into a horizontal slag storage tank via a slag-locking and discharge valve. Through this slag-locking and discharge device, this invention achieves online slag discharge for direct coal liquefaction asphalt for the first time, solving the asphalt pump switching problem and reducing the risk of asphalt pump damage. The online slag discharge method of this invention significantly reduces the processing time after direct coal liquefaction asphalt blockage, decreasing it from 10 hours to 1 hour. This invention also saves on the amount of flushing oil used in the direct coal liquefaction asphalt blockage treatment process, reducing flushing oil consumption by 2-3 times and minimizing the impact of flushing oil on the system load. Furthermore, this invention significantly reduces the number of production operation steps after direct coal liquefaction asphalt blockage, lowering workload and improving the safety factor of the equipment. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a coal direct liquefaction asphalt conveying and slag-discharging device according to one embodiment of the present invention.

[0024] The attached diagram is labeled as follows: 101, Coal liquefaction pressure reducing tower; 102, Flushing oil pipeline; 103, Asphalt pump; 104, Asphalt molding system; 105, Heat transfer oil tracing system; 106, Outlet valve; 201, Vertical slag collection tank; 202, Slag lock and discharge valve; 203, Horizontal slag storage tank; 204, First vent valve; 205, Drain outlet; 206, Second vent valve; 207, First hollow circular plate; 208, First open circular plate; 209, Second hollow circular plate; 210, Second open circular plate; 301, First filter screen; 302, Second filter screen; 401, First heat transfer oil inlet; 402, First heat transfer oil outlet; 403, Second heat transfer oil inlet; 404, Second heat transfer oil outlet. Detailed Implementation

[0025] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0026] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "bottom," and "top," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] Unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and connections within two components or interactions between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0028] The opening degree of the slag-locking and slag-discharging valve 202 in this invention is defined as follows: 1 turn, 2 turns and 3 turns correspond to the slag-locking and slag-discharging valve 202 being in a slightly open state, and the opening degree increases sequentially. When the opening degree is 40 turns, the slag-locking and slag-discharging valve 202 is in a fully open state.

[0029] like Figure 1As shown, this invention provides a coal direct liquefaction bitumen slag-locking and slag-discharging device, which includes a vertical slag collection tank 201, a slag-locking and slag-discharging valve 202, and a horizontal slag storage tank 203. The vertical slag collection tank 201 has an inlet pipeline and an outlet pipeline on its side wall. The interior of the vertical slag collection tank 201 includes a first filter screen 301, a first hollow circular plate 207, and a first open circular plate 208. The first filter screen 301 is a first hollow cylindrical barrel with an open inclined surface at the top, and the side wall of the barrel is a filter screen structure. The bottom of the first hollow cylindrical barrel is detachably connected to the first hollow circular plate 207 (for example, the first hollow circular plate 207 has a circular groove, and the first hollow cylindrical barrel is placed in the circular groove) and the hollow diameter of the first hollow circular plate 207 is smaller than the hollow diameter of the first hollow cylindrical barrel. The first hollow circular plate 207 and the bottom of the vertical slag collection tank form an inverted frustum-shaped structure, creating an inner cavity for slag collection. The upper opening slope of the first hollow cylindrical barrel coincides with the opening of the first opening circular plate 208. The lower side of the opening slope of the first hollow cylindrical barrel faces the inlet pipe of the vertical slag collection tank 201 and is lower than the lowest point of the inlet pipe, while the higher side faces the outlet pipe of the vertical slag collection tank 201 and is higher than the highest point of the outlet pipe. The bottom of the vertical slag collection tank 201 is connected to one end of the slag-locking and slag-discharging valve 202, and the other end of the slag-locking and slag-discharging valve 202 is connected to the horizontal slag storage tank 203. The side wall of the vertical slag collection tank 201 is also provided with a first heat transfer oil inlet 401 and a first heat transfer oil outlet 402.

[0030] The other end of the inlet pipeline of the vertical slag collection tank 201 is connected to the coal liquefaction pressure reducing tower 101, and the other end of the outlet pipeline is connected to the asphalt pump 103. Valves (not shown in the figure) are respectively installed at the inlet and outlet pipelines of the vertical slag collection tank 201. A first vent valve 204 is installed at the top of the vertical slag collection tank 201. A heat transfer oil heating system 105 is also installed along the entire length of the inlet and outlet pipelines.

[0031] Specifically, the coal direct liquefaction asphalt output from the coal liquefaction pressure reducing tower 101 enters the vertical slag collection tank 201 through a pipeline. After being filtered by the first filter screen 301, the filter residue is stored in the inner cavity of the vertical slag collection tank 201. When the asphalt pump runs dry or fails to discharge, it indicates that there is a large amount of filter residue in the vertical slag collection tank 201. Then, the slag-locking discharge valve 202 is opened, and the filter residue enters the horizontal slag storage tank 203 through the slag-locking discharge valve 202 for subsequent cleaning. Through the above-mentioned slag-locking discharge device, the filter residue is prevented from directly entering the inlet filter of the asphalt pump 103, causing blockage. This invention achieves online slag discharge of coal direct liquefaction asphalt for the first time, solves the asphalt pump switching problem, and reduces the risk of damage to the asphalt pump.

[0032] It should be noted that the coal liquefaction pressure reducing tower 101 can be a fractionation tower for the reaction products of a coal liquefaction unit, or it can be an asphalt storage tank, an asphalt buffer tank, or other asphalt storage or temporary storage facility.

[0033] The asphalt pump 103 is also connected to an asphalt forming system 104 via a pipeline, the asphalt forming system 104 being used to receive filtered coal direct liquefaction asphalt.

[0034] The heat transfer oil tracing system 105 is installed throughout the entire process on the inlet and outlet pipelines of the vertical slag tank and the asphalt pump 103 to ensure the fluidity of the asphalt.

[0035] The top of the vertical slag collection tank 201 is equipped with a flange-connected large cover for easy disassembly and inspection; the large cover is equipped with a first vent valve 204 to facilitate confirmation of the internal pressure of the vertical slag collection tank 201 before disassembly and inspection.

[0036] The first heat transfer oil inlet 401 and the first heat transfer oil outlet 402 can be located at any position on the side wall of the vertical slag collection tank 201. Their main purpose is to ensure that the first heat transfer oil enters from the first heat transfer oil inlet 401 and exits from the first heat transfer oil outlet 402, maintaining a certain temperature in the vertical slag collection tank 201 and ensuring the fluidity of the asphalt. For example, in this design, the first heat transfer oil inlet 401 is located on the upper side wall of the outlet pipeline of the vertical slag collection tank 201, and the first heat transfer oil outlet 402 is located on the lower side wall of the inlet pipeline of the vertical slag collection tank 201.

[0037] During use, the coal direct liquefaction pitch enters from the lower side of the first hollow cylinder and exits from the higher side of the first hollow cylinder, which ensures that the output coal direct liquefaction pitch is completely filtered, so that the filter residue remains on the inner wall of the first hollow cylinder and falls into the inner cavity of the vertical slag collection tank 201.

[0038] It should be noted that the structure of the first filter 301 can also be used for other filters with filter elements.

[0039] Furthermore, the aperture of the first filter screen 301 is φ10-25mm, preferably φ15-20mm, for example φ20mm.

[0040] Furthermore, the slag discharge valve 202 is one of a slide valve, a gate valve, and a ball valve, preferably a slide valve.

[0041] Furthermore, a flushing oil pipeline 102 is connected to the inlet pipeline of the vertical slag collection tank 201. The distance between the flushing oil pipeline 102 and the outlet valve 106 at the bottom of the coal liquefaction pressure reducing tower 101 is ≤100cm, preferably ≤50cm, and more preferably ≤30cm. For example, 10cm, 20cm, 30cm, or other values ​​within this range. Because the asphalt solid content in direct coal liquefaction is 50%, this is to prevent the flushing dead zone from causing pipeline blockage.

[0042] Furthermore, the horizontal slag storage tank 203 is provided with a second filter screen 302 inside, which is used to receive and store the waste slag in the inner cavity of the vertical slag collection tank 201; the side wall of the horizontal slag storage tank 203 is also provided with a second heat transfer oil inlet 403 and a second heat transfer oil outlet 404.

[0043] Furthermore, the horizontal slag storage tank 203 is also equipped with a second hollow circular plate 209 and a second open circular plate 210. The second filter screen 302 is a second hollow cylindrical barrel with an open inclined surface at the feed end. The barrel wall is a filter screen structure. The bottom of the second hollow cylindrical barrel is detachably connected (for example, a circular groove is opened on the second hollow circular plate 209, and the second hollow cylindrical barrel is placed in the circular groove) on the second hollow circular plate 209, and the hollow diameter of the second hollow circular plate 209 is smaller than the hollow diameter of the second hollow cylindrical barrel; the feed of the second hollow cylindrical barrel... The inclined surface of the material end opening coincides with the opening of the second open circular plate 210; the short side of the inclined surface of the second hollow cylindrical opening faces the material inlet of the horizontal slag collection tank 203, and the short side does not coincide with the material inlet; the long side of the inclined surface of the second hollow cylindrical opening faces the material outlet of the horizontal slag collection tank 203, and the long side completely covers the material outlet; a drain port 205 is installed on the side of the horizontal slag storage tank 203 near the second hollow circular plate 209, and a second vent valve 206 is installed on the side of the horizontal slag storage tank 203 near the second open circular plate 210.

[0044] Specifically, the waste enters from the short side of the second hollow cylinder, ensuring that the waste remains completely on the inner wall of the second hollow cylinder, making it easy to clean directly.

[0045] Furthermore, the aperture of the second filter screen is φ10-25mm, preferably φ15-20mm, for example φ20mm.

[0046] The second filter screen 302 is also equipped with a handle for easy removal and cleaning when collecting slag.

[0047] It should be noted that the structure of the second filter 302 can also be used for other filters with filter elements.

[0048] The horizontal slag storage tank 203 is provided with a manhole connected to a flange on the side near the second open circular plate 210 for easy disassembly and inspection. A second vent valve 206 is provided on the manhole to facilitate confirmation of the internal pressure of the horizontal slag storage tank 203 before disassembly and inspection.

[0049] The horizontal slag storage tank 203 is equipped with a drain port 205 on the side near the second hollow circular plate 209. The drain port 205 is connected to the sewage system. The sewage system can be a temporary oil receiving measure to facilitate the sealed discharge and collection of waste oil in the slag.

[0050] The second heat transfer oil inlet 403 and the second heat transfer oil outlet 404 can be located at any position on the side wall of the horizontal slag storage tank 203. Their main purpose is to ensure that the second heat transfer oil enters through the second heat transfer oil inlet 403 and exits through the second heat transfer oil outlet 404, thus maintaining a certain temperature in the horizontal slag storage tank 203. For example, in this design, the second heat transfer oil inlet 403 is located on the right side wall of the material outlet of the horizontal slag storage tank 203, and the second heat transfer oil outlet 404 is located on the upper side wall of the drain outlet 205 of the horizontal slag storage tank 203.

[0051] The present invention also provides a method for online slag removal using the above-mentioned coal direct liquefaction bitumen slag-locking and slag-removing device, comprising the following steps:

[0052] S1. Flushing process: Open the heat transfer oil heating system 105; when the asphalt pump 103 runs dry or does not produce material, close the outlet valve 106 at the bottom of the coal liquefaction pressure reducing tower 101, open the flushing oil pipeline 102 to flush the pipeline, and after flushing is completed, stop the asphalt pump 103 and close the valves on the flushing oil pipeline 102 and the inlet and outlet pipelines of the vertical slag collection tank 201.

[0053] S2. Slag Locking and Discharge Process: Open the slag locking and discharge valve 202 to discharge slag. After completion, close the slag locking and discharge valve 202, then open the valves on the inlet and outlet pipelines of the vertical slag collection tank 201 and start the asphalt pump 103.

[0054] S3. Slag removal process: Close the second heat transfer oil inlet 403 and the second heat transfer oil outlet 404. After the horizontal slag storage tank 203 cools down to below 100℃, the sludge oil in the horizontal slag storage tank 203 is discharged through the drain port 205. After confirming that the pressure of the horizontal slag storage tank 203 is at normal pressure through the second vent valve 206, take out the second filter screen 302, clean it and reinstall it.

[0055] Furthermore, prior to step S2, the temperature of the heat transfer oil entering from the second heat transfer oil inlet 403 and exiting from the second heat transfer oil outlet 404 is controlled so that the temperature of the horizontal slag storage tank 203 is lower than the temperature of the vertical slag collection tank 201, and the temperature difference is ≤60℃, preferably 10℃≤temperature difference≤50℃, more preferably 25℃≤temperature difference≤35℃, for example 25℃, 27℃, 29℃, 31℃, 33℃, 35℃ or other values ​​within this range.

[0056] By setting the temperature difference as described above, a pressure difference is created between the vertical slag collection tank 201 and the horizontal slag storage tank 203, which can further accelerate the output of waste slag into the horizontal slag storage tank 203.

[0057] Further, in step S1, the temperature of the heat transfer oil tracing system 105 is 300-320℃, preferably 310-320℃, more preferably 310-315℃, such as 310℃, 311℃, 312℃, 313℃, 314℃, 315℃, or other values ​​within this range. The flushing oil pipeline 102 uses high-temperature, low-pressure flushing oil with a temperature of 300-330℃, such as 300℃, 305℃, 310℃, 320℃, 330℃, or other values ​​within this range, and a pressure of 2.0-2.5MPa, such as 2.0MPa, 2.1MPa, 2.2MPa, 2.3MPa, 2.4MPa, 2.5MPa, or other values ​​within this range; and / or,

[0058] In step S2, the slag-locking and slag-discharging valve 202 is initially opened to 1 to 3 turns. After the pressure between the vertical slag collection tank 201 and the horizontal slag storage tank 203 is equalized, the slag-locking and slag-discharging valve 202 is fully opened to complete the slag discharge.

[0059] The amount of high-temperature and low-pressure flushing oil used is 1 to 1.5 times the total volume of the pipeline from the outlet valve 106 at the bottom of the coal liquefaction pressure reducing tower 101 to the vertical slag collection tank 201 and the volume of the vertical slag collection tank 201.

[0060] The slag discharge valve 202 is partially opened first and then fully opened. This avoids the waste residue from directly impacting the horizontal slag storage tank 203 when it is fully opened, which would cause abnormal noise and damage the horizontal slag storage tank 203.

[0061] The apparatus and method of the present invention will be further described below through specific examples.

[0062] Example 1

[0063] According to the online slag discharge method, the heat transfer oil heating system 105 is turned on. When the asphalt pump 103 runs dry or does not discharge, the outlet valve 106 at the bottom of the coal liquefaction pressure reducing tower 101 is closed, and the flushing oil pipeline 102 is turned on. The horizontal slag storage tank 203 is circulated and heated to 305°C through the heat transfer oil system of the horizontal slag storage tank 203. The slag lock discharge valve 202 is turned on. The slag lock discharge valve 202 is initially opened to 2 turns. After equalization, the slag lock discharge valve 202 is fully opened. The slag discharge stage lasts for 4.6 minutes. The slag lock discharge valve 202 is then closed. The valves on the inlet and outlet pipelines of the vertical slag collection tank 201 are opened to restore the normal operation of the vertical slag collection tank 201. The heat transfer oil system of the horizontal slag storage tank 203 was shut off. After the tank cooled to 98℃, the sludge was drained from the tank to the drain port 205. The pressure inside the tank was checked through the vent via the manhole of the tank to confirm it was at atmospheric pressure. The second filter screen 302 was removed, cleaned, and then reinstalled. The total amount of flushing oil used in the operation was 2.4 tons. Based on the timeframe for not affecting normal production, the entire process from flushing to slag locking and discharge took 0.75 hours.

[0064] Example 2

[0065] According to the online slag discharge method, the heat transfer oil heating system 105 is turned on. When the asphalt pump 103 runs dry or does not discharge, the outlet valve 106 at the bottom of the coal liquefaction pressure reducing tower 101 is closed, and the flushing oil pipeline 102 is turned on. The horizontal slag storage tank 203 is circulated and heated to 315°C through the heat transfer oil system of the horizontal slag storage tank 203. The slag lock discharge valve 202 is turned on. The slag lock discharge valve 202 is initially opened to 3 turns. After equalization, the slag lock discharge valve 202 is fully opened. The slag discharge stage lasts for 5.4 minutes. The slag lock discharge valve 202 is then closed. The valves on the inlet and outlet pipelines of the vertical slag collection tank 201 are opened to restore the normal operation of the vertical slag collection tank 201. Shut down the heat transfer oil system of the horizontal slag storage tank 203. After the horizontal slag storage tank 203 cools down to 90℃, drain the sludge from the horizontal slag storage tank 203 to the drain port 205 to empty the sludge oil. Confirm that the pressure inside the tank is at atmospheric pressure through the vent port set in the manhole of the horizontal slag storage tank 203. Remove the second filter screen 302, clean it, and then reinstall it. The total amount of flushing oil used in the operation process is 3.0 tons. According to the time limit of not affecting normal production, the time taken from flushing to the completion of slag locking and discharge is 0.86 hours.

[0066] Comparative Example

[0067] According to the conventional slag discharge method, when the asphalt pump 103 runs dry or does not discharge, the outlet valve 106 at the bottom of the coal liquefaction pressure reducing tower 101 is closed, and the flushing oil pipeline 102 is opened. Since the asphalt pump 103 needs to be stopped for a long time, a large amount of flushing oil is required for flushing. After flushing, the asphalt pump 104 is stopped, and the inlet filter is flushed to the sewage system to flush out the heat transfer oil in the inlet filter and the asphalt pump 103, allowing the system to cool naturally. After the temperature drops to 90°C, the inlet filter is cleaned, the filter is reinstalled, the heat transfer oil is turned on, and the flushing oil is turned on to raise the temperature to the hot standby temperature, achieving normal hot standby. The total amount of flushing oil used in the operation is 6.5-9.2 tons. The total production time affected by this process from flushing to standby is 10 hours, including 1 hour of flushing time, 4 hours of cooling time, 2 hours of filter cleaning time, and 3 hours of heating standby time.

[0068] As can be seen from the above embodiments and comparative examples, using the slag-locking and slag-discharging device of the present invention for online slag discharge can significantly save the processing time after coal direct liquefaction pitch blockage, reducing the processing time from the original 10 hours to 1 hour. At the same time, the amount of flushing oil used is reduced by 2-3 times.

[0069] The above embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and are not intended to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the scope of the technology disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention.

Claims

1. A coal direct liquefaction bitumen conveying and slag-discharging device, characterized in that, The device includes a vertical slag collection tank, a slag-locking and slag-discharging valve, and a horizontal slag storage tank. The vertical slag collection tank has an inlet pipeline and an outlet pipeline on its side wall. Inside the vertical slag collection tank are a first filter screen, a first hollow circular plate, and a first open circular plate. The first filter screen is a first hollow cylindrical barrel with an open inclined surface at the top, and the side wall of the barrel is a filter screen structure. The open inclined surface at the top of the first hollow cylindrical barrel coincides with the opening of the first open circular plate. The lower side of the open inclined surface of the first hollow cylindrical barrel faces the inlet pipeline of the vertical slag collection tank and is lower than the lowest point of the inlet pipeline. The opening of the first hollow cylindrical barrel... The higher side of the inclined plane faces the outlet pipeline of the vertical slag collecting tank and is higher than the highest point of the outlet pipeline; the bottom of the first hollow cylinder is detachably connected to the first hollow circular plate, and the hollow diameter of the first hollow circular plate is smaller than the hollow diameter of the first hollow cylinder; the first hollow circular plate and the bottom of the vertical slag collecting tank have an inverted frustum structure, forming an inner cavity for slag collection; the bottom of the vertical slag collecting tank is connected to one end of the slag-locking and slag-discharging valve, and the other end of the slag-locking and slag-discharging valve is connected to the horizontal slag storage tank; the side wall of the vertical slag collecting tank is also provided with a first heat transfer oil inlet and a first heat transfer oil outlet.

2. The coal direct liquefaction asphalt conveying and slag-discharging device according to claim 1, characterized in that, The other end of the inlet pipeline of the vertical slag collection tank is connected to the coal liquefaction pressure reducing tower, and the other end of the outlet pipeline is connected to the asphalt pump. Valves are installed at the inlet and outlet pipelines of the vertical slag collection tank, and a heat transfer oil heating system is installed along the entire length of the inlet and outlet pipelines of the vertical slag collection tank.

3. The coal direct liquefaction asphalt conveying and slag-discharging device according to claim 1 or 2, characterized in that, The slag discharge valve is one of the following: a sliding plate valve, a gate valve, and a ball valve.

4. The coal direct liquefaction asphalt conveying and slag-discharging device according to claim 1 or 2, characterized in that, The vertical slag collection tank is also connected to a flushing oil pipeline, and the distance between the flushing oil pipeline and the outlet valve at the bottom of the coal liquefaction pressure reducing tower is ≤100cm.

5. The coal direct liquefaction asphalt conveying and slag-discharging device according to claim 4, characterized in that, The distance between the flushing oil pipeline and the outlet valve at the bottom of the coal liquefaction pressure reducing tower is ≤50cm.

6. The coal direct liquefaction asphalt conveying and slag-discharging device according to claim 5, characterized in that, The distance between the flushing oil pipeline and the outlet valve at the bottom of the coal liquefaction pressure reducing tower is ≤30cm.

7. The coal direct liquefaction bitumen conveying and slag-discharging device according to any one of claims 1, 2, 5 and 6, characterized in that, The horizontal slag storage tank is equipped with a second filter screen inside, which is used to receive and store the waste slag in the inner cavity of the vertical slag collection tank; the side wall of the horizontal slag storage tank is also equipped with a second heat transfer oil inlet and a second heat transfer oil outlet.

8. The coal direct liquefaction asphalt conveying and slag-discharging device according to claim 7, characterized in that, The horizontal slag storage tank is also equipped with a second hollow circular plate and a second open circular plate. The second filter screen is a second hollow cylindrical barrel with an open inclined surface at the feed end. The barrel wall is a filter screen structure. The bottom of the second hollow cylindrical barrel is detachably connected to the second hollow circular plate, and the hollow diameter of the second hollow circular plate is smaller than the hollow diameter of the second hollow cylindrical barrel. The inclined surface of the feed end opening of the second hollow cylinder coincides with the opening of the second open circular plate; The short side of the inclined surface of the second hollow cylindrical opening faces the material inlet of the horizontal slag collection tank, and the short side does not coincide with the material inlet. The long side of the inclined surface of the second hollow cylindrical opening faces the material outlet of the horizontal slag collection tank, and the long side completely covers the material outlet. A drain outlet is installed on the side of the horizontal slag storage tank near the second hollow cylindrical plate, and a second vent valve is installed on the side of the horizontal slag storage tank near the second open cylindrical plate.

9. The coal direct liquefaction asphalt conveying and slag-discharging device according to claim 8, characterized in that, The first filter screen has a pore size of φ10-25mm; and / or, the second filter screen has a pore size of φ10-25mm.

10. The coal direct liquefaction asphalt conveying and slag-discharging device according to claim 8, characterized in that, The first filter screen has a pore size of φ10-25mm; and / or, the second filter screen has a pore size of φ15-20mm.

11. The coal direct liquefaction asphalt conveying and slag-discharging device according to claim 8, characterized in that, The first filter screen has a pore size of φ15-20mm; and / or the second filter screen has a pore size of φ10-25mm.

12. The coal direct liquefaction asphalt conveying and slag-discharging device according to claim 8, characterized in that, The first filter screen has a pore size of φ15-20mm; and / or, the second filter screen has a pore size of φ15-20mm.

13. The online slag discharge method of the coal direct liquefaction bitumen conveying slag discharge device according to any one of claims 1-12, comprising the following steps: S1. Flushing process: Turn on the heat transfer oil heating system; when the asphalt pump runs dry or does not produce material, close the outlet valve at the bottom of the coal liquefaction pressure reducing tower, open the flushing oil pipeline for pipeline flushing, and after flushing is completed, stop the asphalt pump and close the valves on the flushing oil pipeline and the inlet and outlet pipelines of the vertical slag collection tank. S2. Slag Locking and Discharge Process: Open the slag locking and discharge valve to discharge slag. After completion, close the slag locking and discharge valve, then open the valves on the inlet and outlet pipelines of the vertical slag collection tank and start the asphalt pump. S3. Slag removal process: Close the second heat transfer oil inlet and the second heat transfer oil outlet. After the horizontal slag storage tank cools down to below 100°C, the sludge oil in the horizontal slag storage tank is discharged through the drain outlet. After confirming that the pressure of the horizontal slag storage tank is at normal pressure through the second vent valve, remove the second filter screen, clean it, and reinstall it.

14. The online slag discharge method of the coal direct liquefaction asphalt conveying slag and slag discharge device according to claim 13, characterized in that, Before step S2, the temperature of the heat transfer oil entering from the second heat transfer oil inlet and exiting from the second heat transfer oil outlet is controlled so that the temperature of the horizontal slag storage tank is lower than the temperature of the vertical slag collection tank, and the temperature difference is ≤60℃.

15. The online slag discharge method of the coal direct liquefaction asphalt conveying slag and slag discharge device according to claim 14, characterized in that, 10℃≤the temperature difference≤50℃.

16. The online slag discharge method of the coal direct liquefaction asphalt conveying slag and slag discharge device according to claim 15, characterized in that, 25℃≤The temperature difference≤35℃.

17. The online slag discharge method of the coal direct liquefaction bitumen conveying slag and slag discharge device according to any one of claims 13-16, characterized in that, In step S1, the temperature of the heat transfer oil tracing system is 300-320℃; the flushing oil pipeline uses high-temperature, low-pressure flushing oil with a temperature of 300-330℃ and a pressure of 2.0-2.5MPa; and / or, In step S2, the slag-locking and slag-discharging valve is initially opened to 1 to 3 turns. After the pressure between the vertical slag collection tank and the horizontal slag storage tank is equalized, the slag-locking and slag-discharging valve is fully opened to complete the slag discharge.

18. The online slag discharge method of the coal direct liquefaction asphalt conveying slag and slag discharge device according to claim 17, characterized in that, The temperature of the heat transfer oil heating system is 310-320℃.

19. The online slag discharge method of the coal direct liquefaction asphalt conveying slag and slag discharge device according to claim 18, characterized in that, The temperature of the heat transfer oil heating system is 310-315℃.

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