Coke tower preheating system for needle coke production process
By utilizing the time difference between raw coke and drying in the needle coke production process and adjusting the usage of drying gas, precise control of the coke tower preheating temperature was achieved, solving the problems of uneven preheating and system imbalance in the coke tower, and improving the liquid yield and operational stability of the unit.
Patent Information
- Application Number
- CN202423164427.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-21
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2034-12-21
AI Technical Summary
Existing needle coke production processes suffer from problems such as uneven preheating temperature in the coke tower, reduced liquid yield, increased energy consumption, and periodic fluctuations in equipment, leading to uneven coke quality and increased operational difficulty.
By adopting a process that utilizes the time difference between coking and drying, the idle time of the drying gas is adjusted to be gradually introduced into the preheating tower. Furthermore, by controlling the outlet temperature of the drying furnace, the preheating temperature can be precisely controlled, thus preventing oil and gas from being drawn back into the preheating tower.
It improved the uniformity of preheating temperature in the coke tower and the balance of the system, reduced the amount of oil thrown away, reduced the amount of coke powder carried over, improved the liquid yield and the operational flexibility of the unit, and optimized the production stability.
Smart Images
Figure CN223723074U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of petroleum chemical industry relates to a kind of needle coke production process coke tower preheating system. BACKGROUND
[0002] At present, needle coke is high-quality raw material for producing steelmaking ultra-high power (UHP) graphite electrode, and delayed coking is an important process in needle coke process. In the delayed coking process, the coke tower is an important equipment for needle coke production, and it needs to be fully preheated before feeding coke tower.
[0003] The preheating method of the delayed coking process for traditional needle coke production is to use the oil vapor of the production tower to reverse lead to the top of the preheating tower. At this time, the method has the following defects:
[0004] 1. Low preheating temperature. Generally, the bottom of the tower is required to be preheated to about 330℃ before cutting. In order to achieve the preheating temperature of the preheating tower, a large amount of oil gas from the coke tower is gradually introduced into the preheating tower. This part of the oil gas is cooled and released to the low pressure system after preheating. This breaks the material balance, heat balance and pressure balance, increases the operation difficulty of the device, and brings many systematic problems.
[0005] 2. The preheating final temperature distribution of the coke tower is not reasonable, forming high at the top and low at the bottom. The production of needle coke has strict requirements on temperature, and the uneven preheating temperature of the preheating tower seriously affects the coking process, causing uneven quality distribution of needle coke in the coke tower, and unable to effectively improve the coke quality.
[0006] 3. Each preheating of the coke tower produces oil, which becomes waste oil, reduces liquid recovery, increases energy consumption, and reduces the yield of the device.
[0007] 4. It causes periodic fluctuations of the device, reduces the quality control accuracy of the by-product, and increases the heat energy loss of the system, the amount of coke powder carried by the production system, and the coking risk of the heating furnace. INVENTION CONTENTS
[0008] The utility model aims at solving the above problems, and provides a kind of needle coke production process coke tower preheating system.
[0009] To achieve the above purpose, the utility model provides a kind of needle coke production process coke tower preheating system, which comprises a coking tower, a preheating tower and a cold coke tower and a feeding four-way valve. The feeding four-way valve is connected with the coking tower, the preheating tower and the cold coke tower through pipelines respectively. The coking tower, the preheating tower and the cold coke tower are connected to a fractionating tower through first, second and third pipelines respectively. First and second oil gas isolation valves are arranged on the first and second pipelines respectively.
[0010] The dry gas pipeline is connected with the green coke tower, the preheating tower, the cold coke tower and the fractionating tower respectively, and a dry gas feeding adjusting valve is arranged on the dry gas pipeline, a first dry gas cut-off valve is arranged on the pipeline where the dry gas pipeline is connected with the green coke tower, a second dry gas cut-off valve is arranged on the pipeline where the dry gas pipeline is connected with the preheating tower, a third dry gas cut-off valve is arranged on the pipeline where the dry gas pipeline is connected with the cold coke tower, and a dry gas to fractionating tower adjusting valve is arranged on the pipeline where the dry gas pipeline is connected with the fractionating tower.
[0011] The beneficial effects of the present application are as follows:
[0012] The needle coke production process coke tower preheating system of the present application utilizes the time difference between green coke and drying to adjust the dry gas idle time into the preheating tower, and then the outlet temperature of the drying furnace can be controlled to safely and accurately control the preheating temperature to a higher preheating temperature for producing needle coke. Compared with the prior art, the oil gas at the top of the green coke tower is diverted to the preheating tower, which breaks through the bottleneck of the original coke tower preheating technology, ensures the system balance of the device production, improves the liquid recovery and operation flexibility, reduces oil throwing, reduces coke powder carrying, and systematically optimizes many problems in the continuous-intermittent production of the needle coke device. BRIEF DESCRIPTION OF DRAWINGS
[0013] Figure 1 The needle coke production process coke tower preheating system according to an embodiment of the present application is schematically shown. DETAILED DESCRIPTION
[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.
[0015] The present application will be described in detail below in combination with the drawings and specific embodiments, and the embodiments cannot be described one by one here, but the embodiments of the present application are not limited to the following embodiments.
[0016] As shown in Figure 1 The present application provides a needle coke production process coke tower preheating system,
[0017] The utility model discloses a needle coke production process coke tower preheating system, including green coke tower 1, preheating tower 2 and coke tower 3 and feed four -way valve 4, feed four -way valve 4 is connected with green coke tower 1, preheating tower 2 and coke tower 3 respectively through the pipeline, and green coke tower 1, preheating tower 2 and coke tower 3 are connected to fractionating tower through first pipeline 11, second pipeline 12 and third pipeline 13 respectively, and first oil gas isolation valve 111 and second oil gas isolation valve 121 are arranged on first pipeline 11 and second pipeline 12 respectively.
[0018] The utility model discloses a needle coke production process coke tower preheating system, when normal production, the radiation feed from the coking furnace enters green coke tower 1 through feed four -way valve 4, and after the pyrolysis condensation reaction, needle coke is left in green coke tower 1, and reaction oil gas enters subsequent fractionating tower through first oil gas isolation valve 11.
[0019] The above -mentioned process mentions, and the coke tower after the defecation needs preheating, in order to be used for the next green coke, after the defecation of preheating tower 2, through the regulation control of dry gas feed regulating valve 51 and dry gas to fractionating tower regulating valve 55, make dry gas gradually lead to preheating tower 2 through second dry gas isolation valve 53, and then enter fractionating tower after following green coke tower oil gas confluence through second oil gas isolation valve 7.
[0020] The needle coke production process coke tower preheating system utilizes the green coke and drying time difference, adjusts the original drying gas empty time into the fractionating tower to be gradually introduced into the preheating tower, and then the outlet temperature of the drying furnace can be controlled to safely and accurately control the higher preheating temperature of the preheating to the production of needle coke. Compared with the mode that the oil gas at the top of the green coke tower is inverted and introduced into the preheating tower in the prior art, the utility model breaks through the bottleneck of the original coke tower preheating technology, guarantees the system balance of the device production, improves the liquid recovery and the operation flexibility, simultaneously reduces the oil throwing, reduces the coke powder carrying, and systematically optimizes many problems of the continuous-batch production of the needle coke device. The above is only one embodiment of the utility model and is not used for limiting the utility model. For the person skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement and the like within the spirit and principle of the utility model should be included in the protection range of the utility model.
Claims
1. A needle coke production process coke drum preheating system characterized by, It includes green coke tower (1), preheating tower (2) and cold coke tower (3) and feed four-way valve (4), the feed four-way valve (4) is connected with the green coke tower (1), the preheating tower (2) and the cold coke tower (3) through pipeline respectively, the green coke tower (1), the preheating tower (2) and the cold coke tower (3) are connected to fractionating tower through first pipeline (11), second pipeline (12) and third pipeline (13) respectively, first oil gas isolation valve (111) and second oil gas isolation valve (121) are respectively arranged on the first pipeline (11) and the second pipeline (12);It also includes dry gas pipeline (5), the dry gas pipeline (5) is connected with the green coke tower (1), the preheating tower (2), the cold coke tower (3) and the fractionating tower respectively, dry gas feed regulating valve (51) is arranged on the dry gas pipeline (5), the pipeline that the dry gas pipeline (5) is connected with the green coke tower (1) is provided with first dry gas isolation valve (52), second dry gas isolation valve (53) is arranged on the pipeline that the dry gas pipeline (5) is connected with the preheating tower (2), third dry gas isolation valve (54) is arranged on the pipeline that the dry gas pipeline (5) is connected with the cold coke tower (3), dry gas to fractionating tower regulating valve (55) is arranged on the pipeline that the dry gas pipeline (5) is connected with the fractionating tower.