Liquefied oil transportation pipelines and coal liquefaction systems

Abstract

This disclosure relates to a liquefied oil transportation pipeline and a coal liquefaction system. The transportation pipeline includes a main pipeline, a diversion valve assembly, and a slag discharge assembly. The diversion valve assembly is connected to the main pipeline to divide the main pipeline into multiple independently controllable diversion pipelines. Each diversion pipeline includes a delivery pump. Multiple slag discharge assemblies are provided, each corresponding to and connected to a diversion pipeline, and located between the delivery pump and the diversion valve assembly. These assemblies are used to dynamically recover coking impurities in the diversion pipelines. This liquefied oil transportation pipeline, by dividing the main pipeline into multiple independently controllable diversion pipelines through the diversion valve assembly, avoids situations where one delivery pump in the same pipeline has an excessive flow rate while another has an insufficient flow rate during the transportation of solid-containing liquefied oil. The slag discharge assembly is also provided in each diversion pipeline, which can dynamically recover coking impurities generated in the diversion pipelines, preventing coking impurities from entering the delivery pumps through the diversion pipelines and causing damage.

Description

Technical Field

[0001] This disclosure relates to the field of direct coal liquefaction technology, and more specifically, to a liquefied oil transport pipeline and a coal liquefaction system. Background Technology

[0002] In the direct coal liquefaction process, the function of the vacuum distillation tower is to deliver liquefied oil to downstream units. The liquefied oil being transported is a high-temperature, high-viscosity product containing solid materials. In related technologies, two vacuum distillation tower bottom pumps usually share a single inlet pipeline. This can easily lead to one pump having an excessive flow rate, which may cause the other pump to have an insufficient flow rate, thus affecting the overall conveying efficiency and failing to meet the precise requirements of the production process for material conveying. Furthermore, it can easily lead to the problem of coking slag lumps being difficult to remove, causing damage to the vacuum distillation tower bottom pump. Summary of the Invention

[0003] The purpose of this disclosure is to provide a liquefied oil transportation pipeline with reasonable pipeline distribution, accurate material delivery capacity, and good discharge of slag.

[0004] To achieve the above objectives, a first aspect of this disclosure provides a liquefied oil transport pipeline comprising: Supervisor Road; A diversion valve assembly is connected to the main pipeline to divide the main pipeline into multiple diversion pipelines that can be controlled individually, and the diversion pipelines include delivery pumps; The slag discharge assembly comprises multiple components, each corresponding to and connected to the diversion pipeline, and is located between the delivery pump and the diversion valve group. It is used to dynamically recover coking impurities in the diversion pipeline.

[0005] Optionally, the slag discharge assembly includes a connector, a slag discharge pipe, and a slag discharge tank. The connector is operably used to connect the slag discharge pipe to the diversion pipeline, and the slag discharge tank is used to receive coking impurities in the diversion pipeline.

[0006] Optionally, the slag discharge tank includes a tank body and a filter element. The tank body is connected to the slag discharge pipe and is located at the inlet pipeline of the conveying pump. The filter element includes a slag inlet and a liquid outlet, which are removably connected to the tank body. The slag inlet is arranged opposite to the slag discharge pipe. A filter screen is provided at the liquid outlet for discharging the medium that enters the filter element along with the coking impurities.

[0007] Optionally, the tank body is provided with an openable cleaning port and a pick-and-place port. The cleaning port is located at the bottom of the tank body and is used to remove the liquefied oil in the tank body. The pick-and-place port is located at the bottom of the tank body and is used to pick up and place the filter element.

[0008] Optionally, the outer wall of the main pipeline and the branch pipeline is provided with a heat-conducting jacket, and the inner wall of the heat-conducting jacket is provided with a spiral heat-conducting plate or a longitudinal heat-conducting fin.

[0009] Optionally, it also includes a purge pipeline, wherein multiple purge pipelines are provided, each corresponding to one of the diversion pipelines and connected to the diversion pipelines, with the connection point located between the delivery pump and the diversion valve group, for cleaning the diversion pipelines.

[0010] Optionally, the purging pipeline includes a first pipeline and a second pipeline. The first pipeline is connected to the diversion pipeline and is used to clean the diversion pipeline. The second pipeline is connected to the slag discharge assembly and is used to clean the slag discharge assembly.

[0011] Optionally, the first and second pipelines include at least a steam purging pipeline and a flushing oil cleaning pipeline.

[0012] Optionally, the flow divider valve group includes multiple multi-way valves, and / or multiple single-way valves.

[0013] A second aspect of this disclosure also provides a coal liquefaction system, including a pressure reducing tower and a liquefied oil transport pipeline as described in any of the above embodiments, wherein the main pipeline is connected to the pressure reducing tower.

[0014] The advantages of this disclosure through the above technical solution are as follows: The liquefied oil transportation pipeline of this disclosure divides the main pipeline into multiple independently controllable branch pipelines through a diversion valve assembly. This avoids the situation where the flow rate of one pump in the same pipeline is too high and the flow rate of another pump is insufficient when transporting liquefied oil containing solids. Furthermore, a slag discharge assembly is installed in the branch pipeline. The slag discharge assembly can dynamically recover coking impurities generated in the branch pipeline, preventing coking impurities from entering the pumps and causing damage to them. Dynamic recovery also avoids the need to shut down the entire transportation pipeline when recovering coking impurities. Therefore, the liquefied oil transportation pipeline of this disclosure has both high transportation efficiency and good safety.

[0015] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of a liquefied oil transport pipeline provided in an exemplary embodiment of this disclosure; Figure 2This is a cross-sectional view of the slag discharge assembly in a liquefied oil transport pipeline provided in an exemplary embodiment of this disclosure.

[0017] Explanation of reference numerals in the attached figures 1-Main pipeline; 2-Diverter valve assembly; 3-Slag discharge assembly; 31-Connector; 32-Slag discharge pipe; 33-Slag discharge tank; 331-Tank body; 332-Filter element; 333-Cleaning port; 334-Inlet / outlet port; 4-Diverter pipeline; 41-Transfer pump; 5-Purge pipeline; 51-First pipeline; 52-Second pipeline; 6-Heat-conducting jacket. Detailed Implementation

[0018] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0019] In this disclosure, unless otherwise stated, directional terms such as "upper," "lower," "higher," "lower," "top," and "bottom" generally refer to the orientation of the corresponding component or structure in the direction of gravity. "Inner" and "outer" refer to the inner and outer contours of the corresponding component. Furthermore, it should be noted that terms such as "first" and "second" are used to distinguish one element from another and do not indicate sequence or importance. Additionally, in the description with reference to the accompanying drawings, the same reference numerals in different drawings denote the same element. The above definitions are for explanation and illustration only and should not be construed as limiting this disclosure.

[0020] This disclosure relates to a liquefied oil transport pipeline that can avoid the problem of blockage and damage to the transfer pump 41 during transportation. See [link to relevant documentation]. Figure 1 and Figure 2 The liquefied oil transportation pipeline disclosed herein includes a main pipeline 1, a diversion valve group 2, and a slag discharge assembly 3. The main pipeline 1 can be connected to the pressure reducing tower in the coal liquefaction system to transport the liquefied oil produced in the pressure reducing tower to the subsequent processing area or to the storage area for storage. The diversion valve group 2 is connected to the main pipeline 1 and can divert the main pipeline 1 into multiple independently controllable diversion pipelines 4. Each diversion pipeline 4 is equipped with a delivery pump 41, which can deliver the liquefied oil in the diversion pipeline 4. It should be noted that independent control refers to the ability to control the flow rate of the liquefied oil in the diversion pipeline 4. The control method can be conventionally achieved through valve control or other control methods known to those skilled in the art, which will not be elaborated further here. Multiple slag discharge assemblies 3 are provided, each corresponding to one of the diversion pipelines 4 and connected to the diversion pipeline 4, so that the slag discharge assembly 3 can dynamically recover coking impurities in the diversion pipeline 4 and prevent coking impurities from entering the delivery pump 41 and causing damage to the delivery pump 41.

[0021] The liquefied oil transportation pipeline of this disclosure divides the main pipeline 1 into multiple independently controllable branch pipelines 4 through a diversion valve assembly 2. This avoids situations where one delivery pump 41 has an excessive flow rate while another delivery pump 41 has an insufficient flow rate when transporting liquefied oil containing solids. Furthermore, a slag discharge assembly 3 is installed in each branch pipeline 4. The slag discharge assembly 3 can dynamically recover coking impurities generated in the branch pipeline 4, preventing coking impurities from entering the delivery pumps 41 and causing damage to them. Dynamic recovery also avoids the need to shut down the entire transportation pipeline when recovering coking impurities. Therefore, the liquefied oil transportation pipeline of this disclosure has both high transportation efficiency and good safety.

[0022] In some embodiments of this disclosure, see Figure 1 and Figure 2 The diversion valve group 2 includes multiple multi-way valves and / or multiple single-way valves. For example, the diversion valve group 2 may include multiple different single-way valves to divert the main pipeline 1 into multiple diversion pipelines 4 and control the different diversion pipelines 4 respectively. Alternatively, the diversion valve group 2 may be a multi-way valve, such as a three-way valve or a four-way valve, to divert the main pipeline 1 into multiple diversion pipelines 4 and control the different diversion pipelines 4 respectively. Or, the main pipeline 1 may be diverted into multiple diversion pipelines 4 and controlled through a combination of single-way valves and multi-way valves. The specific number of diversions of the main pipeline 1 can be determined as needed, and this disclosure does not limit this.

[0023] In some embodiments of this disclosure, see Figure 1 and Figure 2 The slag discharge assembly 3 includes a connector 31, a slag discharge pipe 32, and a slag discharge tank 33. The connector 31 can be opened to connect the slag discharge pipe 32 to the diversion pipe 4. The connection position can be that the slag discharge pipe 32 is connected to the lower part of the diversion pipe 4, so that the coking impurities in the diversion pipe 4 can fall into the slag discharge pipe 32 through the connector 31. The opening method can be achieved by a valve such as a sliding valve. The slag discharge pipe 32 has a larger diameter and better strength than the connector 31, so that the coking impurities entering the slag discharge pipe 32 can quickly enter the slag discharge tank 33. The slag discharge tank 33 can be made of metal material, so that it has good strength and service life and can store coking impurities for subsequent cleaning by staff.

[0024] In some embodiments of this disclosure, see Figure 1 and Figure 2The slag discharge tank 33 includes a tank body 331 and a filter element 332. The tank body 331 forms the main body of the slag discharge tank 33 and is connected to the slag discharge pipe 32 so that coking impurities in the slag discharge pipe 32 can enter the tank body 331. The filter element 332 is removably connected to the tank body 331 and may include a filter element and components for placing the filter element. The removable connection method can be a snap-fit, bolt connection, or other connection methods known to those skilled in the art. The filter element 332 includes a slag inlet and a liquid outlet. The slag inlet is opposite to the opening of the tank body 331 that connects to the slag discharge pipe 32 so that coking impurities in the slag discharge pipe 32 can enter the filter element 332 through the slag inlet for filtration. After filtration, the coking impurities will remain in the filter element 332. As the coking impurities enter the slag discharge assembly 3, the medium will flow into the tank body 331 through the liquid outlet on the filter element 332 for storage. The type of medium can be liquefied oil, asphalt, or other products of the coal liquefaction process.

[0025] When cleaning the slag discharge tank 33, the filter element 332 can be removed from the tank body 331 first. Then, the liquefied oil in the tank body 331 is collected, and the removed filter element 332 is cleaned, such as removing the residual liquefied oil on the filter element 332 and removing the coking impurities in the filter element 332. After the tank body 331 and the filter element 332 are cleaned, they can be reassembled and used again.

[0026] In some embodiments of this disclosure, see Figure 1 and Figure 2 The tank 331 is located at the inlet pipeline of the transfer pump 41. Since the inlet pipeline of the transfer pump 41 is the lowest point in the entire liquefied oil transportation pipeline in the vertical direction, coking is prone to occur at the inlet pipeline of the transfer pump 41, which can lead to damage to the transfer pump 41 due to coking impurities. Placing the tank 331 at the inlet pipeline can better deal with coking at the inlet pipeline. Furthermore, since the outlet pipeline of the transfer pump 41 is connected to the subsequent flushing section, even if coking occurs, it will not block the outlet pipeline or allow the oil to enter the transfer pump 41. Of course, in other embodiments, the tank 331 can also be located at other positions in the diversion pipeline 4, depending on the actual situation. This disclosure does not impose any restrictions on this.

[0027] In some embodiments of this disclosure, see Figure 1 and Figure 2The tank body 331 is provided with an openable cleaning port 333 and a dispensing port 334. The cleaning port 333 allows the tank body 331 to be opened when cleaning is required, allowing media stored in the tank body 331 that has entered with coking impurities to flow out through the cleaning port 333. The dispensing port 334 is located at the bottom of the tank body 331. The dispensing port 334 allows for a removable connection between the filter element 332 and the tank body 331, enabling the filter element 332 to be removed from the dispensing port 334 when cleaning is required, and then returned to the tank body 331 after cleaning. The sealing method for cleaning port 333 and taking-out port 334 can be to install cover plates at cleaning port 333 and taking-out port 334. The cover plates are detachably connected to cleaning port 333 and taking-out port 334. There can also be sealing strips at the edge of the cover plates, thereby increasing the sealing between the cover plates and cleaning port 333 and taking-out port 334. The specific structure of cleaning port 333 and taking-out port 334 can be determined according to the actual situation, and this disclosure does not limit it.

[0028] In some embodiments of this disclosure, see Figure 1 and Figure 2 A heat-conducting jacket 6 is installed on the outer wall of the main pipeline 1 and the branch pipeline 4. This jacket heats the outer walls of the main pipeline 1 and the branch pipeline 4, ensuring the temperature of the medium in these pipelines remains suitable. This prevents the medium from becoming too cold, which could lead to poor flowability, increased solids content, coking, and transportation difficulties. Spiral heat-conducting plates or longitudinal heat-conducting fins can also be installed on the inner wall of the heat-conducting jacket 6. These plates or fins further increase the uniformity of heating the main pipeline 1 and the branch pipeline 4, ensuring consistent temperature throughout these pipelines. This prevents areas where the temperature is too low, which could cause crystallization and increase the probability of coking.

[0029] In some embodiments of this disclosure, see Figure 1 and Figure 2The liquefied oil transport pipeline disclosed herein also includes a purge pipeline 5. Multiple purge pipelines 5 are provided, each corresponding to and connected to a branch pipeline 4. The connection point is located between the delivery pump 41 and the branch valve assembly 2 of the branch pipeline 4. By providing the purge pipeline 5, when coking occurs in the branch pipeline 4 and the coking impurities are difficult to enter the slag discharge assembly 3 under the influence of the medium in the branch pipeline 4, the purge pipeline 5 can be activated to inject cleaning medium into the branch pipeline 4. This allows the coking impurities in the branch pipeline 4 to flow along the branch pipeline 4 and be discharged into the slag discharge assembly 3 under the action of the cleaning medium in the purge pipeline 5. The inclined medium in the purge pipeline 5 can be flushing oil, which, after entering the slag discharge tank 33 along with the coking impurities, can also be easily discharged.

[0030] In some embodiments of this disclosure, see Figure 1 and Figure 2 The purging pipeline 5 includes a first pipeline 51 and a second pipeline 52, wherein the first pipeline 51 is connected to the diversion pipeline 4, and the second pipeline 52 is connected to the slag discharge assembly 3. The first pipeline 51 can flush the diversion pipeline 4 when it is blocked by coking impurities, as described in the above embodiments, and will not be repeated here. By setting up a second pipeline 52, when the solid content of the medium in the tank body 331 of the slag discharge tank 33 is high and it is difficult to discharge through the cleaning port 333, cleaning medium can be injected into the tank body 331 to dilute and clean the inner cavity of the tank body 331. After rinsing, the medium in the tank body 331 can be cleaned simultaneously through the cleaning port 333. Alternatively, the second pipeline 52 can be equipped with an inlet and an outlet on the slag discharge tank 33, so that the second pipeline 52 can be dynamically operated when cleaning the slag discharge tank 33. The rinsing medium enters the slag discharge tank 33 through the inlet and flows out of the slag discharge tank 33 through the outlet after rinsing. The specific method can be determined according to the actual situation, and this disclosure does not impose any restrictions on it.

[0031] In some embodiments of this disclosure, see Figure 1 and Figure 2The first pipeline 51 and the second pipeline 52 include at least a steam purging pipeline and a flushing oil cleaning pipeline. These pipelines allow workers to flexibly choose which to use during the cleaning of the diversion pipeline 4 and the slag discharge assembly 3. For example, if coking impurities clog the diversion pipeline 4, the flushing oil cleaning pipeline can be activated to move the coking impurities from the diversion pipeline 4 to the slag discharge assembly 3 using cleaning oil. After the coking impurities are cleaned, the steam purging pipeline can be activated to blow the remaining flushing oil in the diversion pipeline 4 to the slag discharge assembly 3 through evaporation. This also facilitates the subsequent transport of liquefied oil by the liquefied oil transport pipeline. Of course, in other embodiments, the structure of the first pipeline 51 and the second pipeline 52 can be of other types, depending on the actual situation. This disclosure does not impose any limitations on this.

[0032] A second aspect of this disclosure also provides a coal liquefaction system, including the liquefied oil transport pipeline and pressure reducing tower described in the above embodiments. The pressure reducing tower contains the liquefied oil produced by the coal liquefaction system. By using the coal liquefied oil transport pipeline of this disclosure, when transporting liquefied oil, the diversion valve group 2 can divert the main pipeline 1 into multiple independently controllable diversion pipelines 4. This avoids the situation where the flow rate of one delivery pump 41 in the same pipeline is too high and the flow rate of another delivery pump 41 is insufficient when transporting solid-containing liquefied oil. Furthermore, a slag discharge assembly 3 is provided in the diversion pipeline 4. The slag discharge assembly 3 can dynamically recover coking impurities generated in the diversion pipeline 4, preventing coking impurities from entering the delivery pump 41 and causing damage to the delivery pump 41. Dynamic recovery also avoids the problem of having to shut down the entire transport pipeline when recovering coking impurities. Therefore, the liquefied oil transport pipeline of this disclosure has both high transport efficiency and good safety.

[0033] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0034] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0035] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A liquefied oil transport pipeline, characterized in that, include: Supervisor Road; A diversion valve assembly is connected to the main pipeline to divide the main pipeline into multiple diversion pipelines that can be controlled individually, and the diversion pipelines include delivery pumps; The slag discharge assembly comprises multiple components, each corresponding to and connected to the diversion pipeline, and is located between the delivery pump and the diversion valve group. It is used to dynamically recover coking impurities in the diversion pipeline.

2. The liquefied oil transport pipeline according to claim 1, characterized in that, The slag discharge assembly includes a connector, a slag discharge pipe, and a slag discharge tank. The connector is operably used to connect the slag discharge pipe to the diversion pipeline, and the slag discharge tank is used to receive coking impurities in the diversion pipeline.

3. The liquefied oil transport pipeline according to claim 2, characterized in that, The slag discharge tank includes a tank body and a filter element. The tank body is connected to the slag discharge pipe and is located at the inlet pipeline of the conveying pump. The filter element includes a slag inlet and a liquid outlet, which are removably connected to the tank body. The slag inlet is arranged opposite to the slag discharge pipe. A filter screen is provided at the liquid outlet for discharging the medium that enters the filter element along with the coking impurities.

4. The liquefied oil transport pipeline according to claim 3, characterized in that, The tank is provided with an openable cleaning port and a pick-and-place port. The cleaning port is located at the bottom of the tank and is used to remove the liquefied oil from the tank. The pick-and-place port is located at the bottom of the tank and is used to pick up and place the filter element.

5. The liquefied oil transport pipeline according to claim 1, characterized in that, The outer wall of the main pipeline and the branch pipeline is provided with a heat-conducting jacket, and the inner wall of the heat-conducting jacket is provided with a spiral heat-conducting plate or a longitudinal heat-conducting fin.

6. The liquefied oil transport pipeline according to claim 1, characterized in that, It also includes a purge pipeline, which is provided in multiple ways, each corresponding to one of the diversion pipelines and connected to the diversion pipeline. The connection point is located between the delivery pump and the diversion valve group, and is used to clean the diversion pipeline.

7. The liquefied oil transport pipeline according to claim 6, characterized in that, The purging pipeline includes a first pipeline and a second pipeline. The first pipeline is connected to the diversion pipeline and is used to clean the diversion pipeline. The second pipeline is connected to the slag discharge assembly and is used to clean the slag discharge assembly.

8. The liquefied oil transport pipeline according to claim 7, characterized in that, The first and second pipelines include at least a steam purging pipeline and a flushing oil cleaning pipeline.

9. The liquefied oil transport pipeline according to any one of claims 1-8, characterized in that, The flow divider valve group includes multiple multi-way valves, and / or multiple single-way valves.

10. A coal liquefaction system, characterized in that, include: The pressure reducing tower and the liquefied oil transport pipeline according to any one of claims 1-9, wherein the main pipeline is connected to the pressure reducing tower.

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