Needle coke drawing process convenient for airflow control

Abstract

The invention provides a needle coke drawing process convenient for airflow control, and relates to the technical field of coke drawing processes, and the needle coke drawing process comprises the following steps: S1, cutting off refined asphalt feeding at the later stage of coke generation of a coke tower, and changing into coking heavy oil feeding; s2, a flow control valve is arranged on a feeding pipeline; s3, constructing a model in the whole coking heavy oil feeding process in a computer, and connecting control points in the model with all valve bodies; s4, the temperature of an outlet of the feeding heating furnace is increased; in the later stage of coke generation of the coke tower, refined asphalt feeding is cut off, coking heavy oil is changed, the temperature of an outlet of a feeding heating furnace is increased to 495-500 DEG C, all the coking heavy oil is vaporized, needed airflow is generated in the coke tower, and sufficient shearing force can be applied to mesophase asphalt without disturbance by controlling the flow of the coking heavy oil and the flow speed of the airflow, so that the coking heavy oil is completely vaporized. Mesophase pitch molecules are solidified in nematic ordered arrangement, the structure of the needle coke is improved, and the quality is improved.

Description

Technical Field

[0001] The invention relates to the technical field of coke pulling technology, and in particular to a needle coke pulling technology that is convenient for airflow control. Background Art

[0002] Needle coke is a high-quality variety of carbon materials that has been vigorously developed. It is a silver-grey, metallic-luster porous solid. Its structure has obvious flow texture, with large and few pores that are slightly elliptical. The particles have a large aspect ratio and a fibrous or needle-like texture. It has good orientation and electrical and thermal conductivity. It is the main raw material for negative electrode materials for lithium-ion batteries and ultra-high power graphite electrodes for steelmaking.

[0003] The formation of needle coke is based on the liquid phase carbonization theory and the airflow coke pulling process. During the whole process from the disintegration of the intermediate phase spheres to the formation of intermediate phase asphalt until solidification, gas needs to flow continuously in a certain direction in the coking tower to exert sufficient shear force on the intermediate phase asphalt without causing disturbance, so that the intermediate phase asphalt molecules can be solidified in a nematic ordered arrangement. Currently, there is a lack of effective technology for determining the airflow velocity and how to generate the required airflow, and research and exploration are needed to improve the quality of needle coke. Therefore, the present invention proposes a needle coke pulling process that is easy to control airflow to solve the problems existing in the prior art. Summary of the invention

[0004] In view of the above problems, the present invention proposes a needle coke pulling process which is easy to control with airflow. The needle coke pulling process which is easy to control with airflow can exert sufficient shear force on the intermediate phase asphalt without causing disturbance by controlling the flow rate of coking heavy oil and the airflow velocity, so that the intermediate phase asphalt molecules are solidified in a nematic ordered arrangement, thereby improving the needle coke structure.

[0005] To achieve the purpose of the present invention, the present invention is implemented by the following technical scheme: a needle coke pulling process that is convenient for airflow control, comprising the following steps:

[0006] S1: In the late stage of coking in the coking tower, the refined asphalt feed is cut off and replaced with coking heavy oil feed;

[0007] S2: A flow control valve is set on the feed pipeline;

[0008] S3: Construct a model of the entire coking heavy oil feeding process in the computer, and connect all valve bodies with the control points in the model;

[0009] S4: Raise the outlet temperature of the feed heating furnace to completely vaporize the coking heavy oil and generate the required airflow in the coking tower;

[0010] S5: Control the coking heavy oil flow rate through the flow control valve, and display the flow data in real time in the computer model;

[0011] S6: Based on the display, the coking heavy oil flow data is adjusted to control the gas flow rate, and the effect on the mesophase asphalt is simultaneously observed;

[0012] S7: Record the flow data range of the flow control valve that can exert sufficient shear force on the mesophase asphalt without causing disturbance, so as to perform subsequent control.

[0013] A further improvement is that: S1 comprises the following steps:

[0014] S11: a feed switching power valve is provided on both the feed pipeline of refined asphalt feed and the feed pipeline of coking heavy oil;

[0015] S12: Connecting the control ends of the two groups of feed switching power valves to the model control points in the computer;

[0016] S13: In the late stage of coking in the coking tower, the feed switching power valve is controlled to cut off the feed of refined asphalt and switch to coking heavy oil feed.

[0017] A further improvement is that: S2 comprises the following steps:

[0018] S21: connecting the output ends of the feed pipeline of the refined asphalt feed and the feed pipeline of the coking heavy oil to the feed main pipe;

[0019] S22: Connect the feed main pipe to the pressure pump to pressurize the feed;

[0020] S23: Install a flow control valve on the pipeline at the output end of the booster pump, and connect the signal output end and the control end of the flow control valve to the model control point in the computer.

[0021] A further improvement is that: S3 comprises the following steps:

[0022] S31: Collect image size data in the entire feeding pipeline;

[0023] S32: constructing a three-dimensional model by scaling the graphic size data in a proportional manner, and constructing a valve model at a specific position of each valve in the three-dimensional model;

[0024] S33: setting a control point in the valve model, and connecting the control point to the valve actually used for operation to perform remote control;

[0025] S34: Set a display window in the model to display the opening and closing operation status of each valve and the current control parameters.

[0026] A further improvement is that: said S4 comprises the following steps:

[0027] S41: Connect the feed main pipe to the feed heating furnace and adjust the outlet temperature of the heating furnace to 495-500°C;

[0028] S42: introducing coking heavy oil, heating at a temperature of 495-500°C, and completely vaporizing it;

[0029] S43: The vaporized coking heavy oil enters the coking tower to generate the required flowing air flow.

[0030] A further improvement is that in S5, a database is set up in the model to record the flow data history adjusted by the flow control valve and add a time stamp for query.

[0031] A further improvement is that in said S6, during the process of adjusting the coking heavy oil flow data, the delivery pressure of the booster pump and the outlet temperature of the feed heating furnace are kept unchanged.

[0032] A further improvement is that: said S7 includes the following steps:

[0033] S71: adjusting the coking heavy oil flow data, when the generated airflow exerts sufficient shear force on the mesophase asphalt without causing disturbance, the flow control valve control data at this time;

[0034] S72: Continue to adjust the coking heavy oil flow data. When the generated airflow disturbs the intermediate asphalt, record the flow control valve control data at the previous moment to form the flow control valve flow data range;

[0035] S73: Set the data range in the flow control valve and control the subsequent flow according to this standard.

[0036] A further improvement is that in S7, a monitoring module is set in the model to monitor the flow data fed back by the flow control valve in real time, and an alarm is issued when the data is abnormal.

[0037] The beneficial effects of the present invention are:

[0038] 1. In the late stage of coking in the coking tower, the present invention cuts off the refined asphalt feed and replaces it with coking heavy oil, and increases the outlet temperature of the feed heating furnace to 495-500°C, so that the coking heavy oil is completely vaporized, and the required airflow is generated in the coking tower. By controlling the coking heavy oil flow rate and the airflow velocity, sufficient shear force can be applied to the mesophase asphalt without causing disturbance, so that the mesophase asphalt molecules are solidified in a nematic orderly arrangement, thereby improving the needle coke structure and improving the quality.

[0039] 2. The overall adjustment method of the present invention is simple and can be digitized. The coking heavy oil flow rate can be seen in the computer model, which is easy to adjust and control.

[0040] 3. The coking heavy oil used in the present invention has a poor coking tendency and can be completely vaporized without coking at the operating temperature, thereby ensuring sufficient airflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a flow chart of the present invention;

[0042] Figure 2 It is the front view of the present invention. DETAILED DESCRIPTION

[0043] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with examples. The examples are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0044] Embodiment 1

[0045] according to Figure 1 , 2 As shown, this embodiment proposes a needle coke pulling process that is convenient for airflow control, comprising the following steps:

[0046] S1: In the late stage of coking in the coking tower, the refined asphalt feed is cut off and replaced with coking heavy oil feed;

[0047] S2: A flow control valve is set on the feed pipeline;

[0048] S3: Construct a model of the entire coking heavy oil feeding process in the computer, and connect all valve bodies with the control points in the model;

[0049] S4: Raise the outlet temperature of the feed heating furnace to completely vaporize the coking heavy oil and generate the required airflow in the coking tower;

[0050] S5: Control the coking heavy oil flow rate through the flow control valve, and display the flow data in real time in the computer model;

[0051] S6: Based on the display, the coking heavy oil flow data is adjusted to control the gas flow rate, and the effect on the mesophase asphalt is simultaneously observed;

[0052] S7: Record the flow data range of the flow control valve that can exert sufficient shear force on the mesophase asphalt without causing disturbance, so as to perform subsequent control.

[0053] The present invention cuts off the refined asphalt feed in the late stage of coking in the coking tower and replaces it with coking heavy oil, and increases the outlet temperature of the feed heating furnace to 495-500°C, so that the coking heavy oil is completely vaporized and the required airflow is generated in the coking tower. By controlling the coking heavy oil flow and the airflow velocity, sufficient shear force can be applied to the mesophase asphalt without causing disturbance, so that the mesophase asphalt molecules are solidified in a nematic orderly arrangement, the needle coke structure is improved, and the quality is improved. The overall adjustment method is simple and can be digitized. The coking heavy oil flow can be seen in the computer model, which is easy to adjust and control.

[0054] Embodiment 2

[0055] according to Figure 1 , 2 As shown, this embodiment proposes a needle coke pulling process that is convenient for airflow control, comprising the following steps:

[0056] In the late stage of coking in the coking tower, the refined asphalt feed is cut off and replaced by coking heavy oil feed; feed switching power valves are set on the feed pipeline of the refined asphalt feed and the feed pipeline of the coking heavy oil; the control ends of the two sets of feed switching power valves are connected to the model control point in the computer; in the late stage of coking in the coking tower, the refined asphalt feed is cut off and replaced by coking heavy oil feed by controlling the feed switching power valve.

[0057] A flow control valve is set on the feed pipeline; the output ends of the feed pipeline of refined asphalt feed and the feed pipeline of coking heavy oil are connected to the feed main pipe; the feed main pipe is connected to a pressure pump to pressurize the feed; a flow control valve is installed on the pipeline at the output end of the pressure pump, and the signal output end and control end of the flow control valve are connected to the model control point in the computer.

[0058] Construct a model of the entire coking heavy oil feeding process in the computer, and connect all the valve bodies with the control points in the model; collect the image size data in the entire feed pipeline; construct a three-dimensional model based on the geometric scaling of the graphic size data, and construct a valve model at the specific position of each valve in the three-dimensional model; set control points in the valve model, connect the control points to the valves actually used for remote control; set a display window in the model to display the opening and closing operation of each valve and the current control parameters. The overall adjustment method is simple and can be digitized. The coking heavy oil flow can be seen in the computer model, which is easy to adjust and control.

[0059] The model construction is as follows: ArcGIS and Revit software are used to stretch the image size data parameters of the entire feed pipeline into three-dimensional form, and then a three-dimensional model is constructed by using one or more combinations of Maya, Rhin, and 3DsMax, and a B / S three-tier architecture is adopted, running on a Windows system, using standard TCP / IP network protocols, using SQL database management systems, and developing with JSP development tools. Ensure that the model runs in an efficient, secure, and confidential environment; and has scalability.

[0060] Increase the outlet temperature of the feed heating furnace to completely vaporize the coking heavy oil and generate the required airflow in the coking tower; connect the feed main pipe to the feed heating furnace and adjust the outlet temperature of the heating furnace to 495-500℃; introduce the coking heavy oil and completely vaporize it under heating at 495-500℃; the vaporized coking heavy oil enters the coking tower to generate the required flowing airflow. Coking heavy oil has a poor tendency to coke and can be completely vaporized without coking at the operating temperature to ensure sufficient airflow.

[0061] The coking heavy oil flow is controlled by a flow control valve, and the flow data is displayed in real time in a computer model; a database is set up in the model to record the flow data history adjusted by the flow control valve and add a time stamp for query.

[0062] Based on the display, the coking heavy oil flow data is adjusted to control the air flow rate, and the effect on the intermediate phase asphalt is observed simultaneously; in the process of adjusting the coking heavy oil flow data, the delivery pressure of the booster pump and the outlet temperature of the feed heating furnace are kept unchanged.

[0063] Record the flow data range of the flow control valve when it can exert sufficient shear force on the mesophase asphalt without causing disturbance, so as to carry out subsequent control: adjust the coking heavy oil flow data, when the generated airflow exerts sufficient shear force on the mesophase asphalt but does not cause disturbance, the flow control valve control data at this time; continue to adjust the coking heavy oil flow data, when the generated airflow causes disturbance to the intermediate asphalt, record the flow control valve control data of the previous moment, so as to form the flow data range of the flow control valve; set this data range in the flow control valve, and control the subsequent flow according to this standard. Set a monitoring module in the model to monitor the flow data fed back by the flow control valve in real time, and alarm when the data is abnormal. By controlling the coking heavy oil flow and the airflow velocity, sufficient shear force can be exerted on the mesophase asphalt without causing disturbance, so that the mesophase asphalt molecules are solidified in the nematic ordered arrangement, improving the needle coke structure and improving the quality; and set an alarm function to improve the reliability of the overall operation of the system.

[0064] The needle coke pulling process with convenient airflow control cuts off the refined asphalt feed and replaces it with coking heavy oil in the late stage of coking in the coking tower, raises the outlet temperature of the feed heating furnace to 495-500°C, vaporizes all the coking heavy oil, generates the required airflow in the coking tower, controls the coking heavy oil flow rate and the airflow velocity, and can exert sufficient shear force on the mesophase asphalt without causing disturbance, so that the mesophase asphalt molecules are solidified in a nematic orderly arrangement, improves the needle coke structure, and improves the quality. The overall adjustment method of the present invention is simple and can be digitized. The coking heavy oil flow rate can be seen in the computer model, which is easy to adjust and control. At the same time, the coking heavy oil has a poor coking tendency and can be completely vaporized without coking at the operating temperature, thereby ensuring sufficient airflow. The process is put into use once and is designed, installed, and used at the same time as the equipment, thus avoiding complicated overhaul and maintenance in the later stage.

[0065] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A needle coke pulling process that facilitates airflow control, characterized in that: The following steps are involved: S1: In the late stage of coking in the coking tower, the refined asphalt feed is cut off and replaced with coking heavy oil feed; S2: A flow control valve is set on the feed pipeline; S3: Construct a model of the entire coking heavy oil feeding process in the computer, and connect all valve bodies with the control points in the model; S4: Raise the outlet temperature of the feed heating furnace to completely vaporize the coking heavy oil and generate the required airflow in the coking tower; S5: Control the coking heavy oil flow rate through the flow control valve, and display the flow data in real time in the computer model; S6: Based on the display, the coking heavy oil flow data is adjusted to control the gas flow rate, and the effect on the mesophase asphalt is simultaneously observed; S7: Record the flow data range of the flow control valve that can exert sufficient shear force on the mesophase asphalt without causing disturbance, so as to perform subsequent control.

2. The needle coke pulling process for facilitating airflow control according to claim 1, characterized in that: The S1 comprises the following steps: S11: a feed switching power valve is provided on both the feed pipeline of refined asphalt feed and the feed pipeline of coking heavy oil; S12: Connecting the control ends of the two groups of feed switching power valves to the model control points in the computer; S13: In the late stage of coking in the coking tower, the feed switching power valve is controlled to cut off the feed of refined asphalt and switch to coking heavy oil feed.

3. The needle coke pulling process for facilitating airflow control according to claim 2, characterized in that: The S2 comprises the following steps: S21: connecting the output ends of the feed pipeline of the refined asphalt feed and the feed pipeline of the coking heavy oil to the feed main pipe; S22: Connect the feed main pipe to the pressure pump to pressurize the feed; S23: Install a flow control valve on the pipeline at the output end of the booster pump, and connect the signal output end and the control end of the flow control valve to the model control point in the computer.

4. The needle coke pulling process for facilitating airflow control according to claim 3, characterized in that: The S3 comprises the following steps: S31: Collect image size data in the entire feeding pipeline; S32: constructing a three-dimensional model by scaling the graphic size data in a proportional manner, and constructing a valve model at a specific position of each valve in the three-dimensional model; S33: setting a control point in the valve model, and connecting the control point to the valve actually used for operation to perform remote control; S34: Set a display window in the model to display the opening and closing operation status of each valve and the current control parameters.

5. The needle coke pulling process for facilitating airflow control according to claim 4, characterized in that: The S4 comprises the following steps: S41: Connect the feed main pipe to the feed heating furnace and adjust the outlet temperature of the heating furnace to 495-500°C; S42: introducing coking heavy oil, heating at a temperature of 495-500°C, and completely vaporizing it; S43: The vaporized coking heavy oil enters the coking tower to generate the required flowing air flow.

6. The needle coke pulling process for facilitating airflow control according to claim 5, characterized in that: In S5, a database is set in the model to record the flow data history adjusted by the flow control valve and add a time stamp for query.

7. The needle coke pulling process for facilitating airflow control according to claim 6, characterized in that: In the above S6, during the process of adjusting the coking heavy oil flow data, the delivery pressure of the booster pump and the outlet temperature of the feed heating furnace are kept unchanged.

8. The needle coke pulling process for facilitating airflow control according to claim 7, characterized in that: The S7 includes the following steps: S71: adjusting the coking heavy oil flow data, when the generated airflow exerts sufficient shear force on the mesophase asphalt without causing disturbance, the flow control valve control data at this time; S72: Continue to adjust the coking heavy oil flow data. When the generated airflow disturbs the intermediate asphalt, record the flow control valve control data at the previous moment to form the flow control valve flow data range; S73: Set the data range in the flow control valve and control the subsequent flow according to this standard.

9. The needle coke pulling process for facilitating airflow control according to claim 8, characterized in that: In S7, a monitoring module is set in the model to monitor the flow data fed back by the flow control valve in real time, and an alarm is issued when the data is abnormal.

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