WO2021128902A1 - 一种针状焦生产过程中的油品混合装置及其工艺 - Google Patents

一种针状焦生产过程中的油品混合装置及其工艺 Download PDF

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WO2021128902A1
WO2021128902A1 PCT/CN2020/111194 CN2020111194W WO2021128902A1 WO 2021128902 A1 WO2021128902 A1 WO 2021128902A1 CN 2020111194 W CN2020111194 W CN 2020111194W WO 2021128902 A1 WO2021128902 A1 WO 2021128902A1
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pipe
oil
asphalt
mixing tank
mixing
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PCT/CN2020/111194
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English (en)
French (fr)
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于振东
廖志强
单春华
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中冶焦耐(大连)工程技术有限公司
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/60—Pump mixers, i.e. mixing within a pump
    • B01F25/64—Pump mixers, i.e. mixing within a pump of the centrifugal-pump type, i.e. turbo-mixers
    • B01F25/641—Multi-staged turbo-mixers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/10—Mixing by creating a vortex flow, e.g. by tangential introduction of flow components
    • B01F25/103—Mixing by creating a vortex flow, e.g. by tangential introduction of flow components with additional mixing means other than vortex mixers, e.g. the vortex chamber being positioned in another mixing chamber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/90—Heating or cooling systems
    • B01F35/92—Heating or cooling systems for heating the outside of the receptacle, e.g. heated jackets or burners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/90—Heating or cooling systems
    • B01F2035/98—Cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
    • B01F2101/38—Mixing of asphalt, bitumen, tar or pitch or their ingredients

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  • the invention relates to the technical field of coal coke chemical industry, in particular to an oil mixing device and a process in the production process of needle coke.
  • Needle coke has good electrical and thermal conductivity and is the main material for the production of high-power and ultra-high-power graphite electrodes. At present, most of the raw material pitch for the production of needle coke comes from soft pitch produced by tar processing.
  • the production process of needle coke is divided into three stages: raw material pretreatment, delayed coking and calcination.
  • the raw material pretreatment is the key stage in the production of needle coke. When the conditions of delayed coking and calcination are determined, the raw material is produced in the pretreatment stage. The better the quality of needle coke raw materials, the better the quality of the needle coke produced.
  • the raw material pretreatment is to remove the quinoline insoluble matter (QI) in the soft pitch, so as to obtain the needle coke raw material, namely the refined pitch.
  • the pretreatment methods of raw materials mainly include flash evaporation, mechanical centrifugation, solvent extraction, and modification. Among them, solvent extraction is relatively mature and has the most extensive applications.
  • the solvent extraction method is to first mix the soft asphalt with the extractant, and then separate to obtain the heavy mixed phase and the light mixed phase. The heavy mixed phase is separated to obtain the heavy asphalt with high QI content and the extractant, and the light mixed phase passes through Separate to obtain refined asphalt and extractant.
  • the method of mixing soft bitumen and extractant is usually to send the soft bitumen and extractant directly into the mixing tank, or after being mixed by a pipeline mixer, then sent to the mixing tank, after being stirred by the mixer of the mixing tank, then sent by the pump Extraction and separation, this method has the following shortcomings:
  • the pipeline mixer has poor mixing effect and is easy to be blocked.
  • the technical problem solved by the present invention is to provide an oil mixing device and process in the production process of needle coke.
  • the soft pitch and the extractant are mixed fully and uniformly, which not only overcomes the traditional agitator and pipeline.
  • the shortcomings of poor mixing effect of the mixer, and improved product yield, equipment maintenance workload is small, stable operation, low labor intensity of operators, and low environmental pollution.
  • An oil mixing device in the production process of needle coke including a mixing tank, an oil and gas condenser, an asphalt pump, an extractant pump, a mixing oil pump, a sprinkler, an asphalt pipe, an extractant pipe, a mixing oil pipe, a circulating pipe, and flue gas Pipes, cooling water supply pipes, cooling return water pipes and spray pipes, characterized in that the oil and gas condenser is arranged on the top of the mixing tank, and the right side is connected with a cooling water supply pipe and a cooling return water pipe from top to bottom, and the top is provided with a cooling water supply pipe and a cooling return water pipe.
  • the flue gas pipe; the mixing tank and the asphalt pump are connected through an asphalt pipe; the extractant pump is connected to the asphalt pipe in front of the asphalt pump through the extractant pipe; the spray head is set in the oil-gas condenser through the spray pipe On the extractant pipe connected to the extractant pump; the bottom of the mixing tank is provided with a mixing oil pipe, the mixing oil pump is provided on the mixing oil pipe, and the mixing oil pipe after the mixing oil pump is provided with a circulating pipe connected to the mixing tank.
  • the asphalt pipe inlet on the mixing tank is located in the horizontal tangential direction of the inner wall of the mixing tank.
  • the circulation pipe is connected to the mixing tank from the upper part, the middle part and the lower part of the mixing tank, and the three inlets of the circulation pipe are all located in the horizontal tangential direction of the inner wall of the mixing tank.
  • An oil mixing process in the production of needle coke includes the following steps:
  • the mixed oil sent by the circulation pipe enters the mixing tank along the horizontal tangential direction from the three inlets of the upper, middle and lower parts of the mixing tank, forming a clockwise spiral vortex from top to bottom in the mixing tank; at the same time, asphalt
  • the mixed oil sent by the pipe also enters the mixing tank along the horizontal tangential direction and flows in the direction of the spiral vortex. Using the difference in the flow rate of the two mixed oils, the soft asphalt and the extract are continuously mixed in the spiral flow;
  • the mixed oil enters the mixing tank along the horizontal tangential direction, forming a clockwise spiral vortex from top to bottom, and the soft pitch and the extract are continuously mixed in the spiral flow;
  • Figure 1 is a schematic diagram of the process flow of the present invention
  • Fig. 2 is a schematic diagram of the structure of the connection interface between the asphalt pipe and the circulating pipe and the mixing tank of the present invention.
  • the invention relates to an oil mixing device in the production process of needle coke, including a mixing tank 1, an oil and gas condenser 2, an asphalt pump 3, an extractant pump 4, a mixed oil pump 5, Sprinkler head 6, asphalt pipe 7, extraction agent pipe 8, mixing oil pipe 9, circulation pipe 10, flue gas pipe 11, cooling water supply pipe 12, cooling return water pipe 13, and spray pipe.
  • the oil and gas condenser 2 is arranged in the mixing tank 1.
  • the top of the mixing tank 1 and the asphalt pump 3 are connected with the asphalt pipe 7 through the asphalt pipe 7; the cooling water supply pipe 12 and the cooling return water pipe 13 are connected in turn from top to bottom on the right side, and the flue gas pipe 11 is arranged on the top;
  • the pump 4 is connected to the asphalt pipe 7 in front of the asphalt pump 3 through the extractant pipe 8;
  • the spray head 6 is arranged in the oil-air condenser 2 and is connected to the extractant pipe 8 behind the extractant pump 4 through the spray pipe 14
  • the bottom of the mixing tank 1 is provided with a mixing oil pipe 9, a mixing oil pump 5 is provided on the mixing oil pipe 9, and a circulating pipe 10 connected to the mixing tank 1 is provided on the mixing oil pipe 9 after the mixing oil pump 5.
  • the inlet A1 of the asphalt pipe 7 on the mixing tank 1 is located in the horizontal tangential direction of the inner wall of the mixing tank 1 (as shown in Figure 2).
  • the circulation pipe 10 is connected to the mixing tank 1 from the upper, middle and lower parts of the mixing tank 1, and the three inlets (A2.1, A2.2, A2.3) of the circulation pipe 10 are all located on the inner wall of the mixing tank 1. In the horizontal tangential direction (see Figure 2).
  • An oil mixing process in the production of needle coke includes the following steps:
  • the mixed oil in the mixing tank 1 is pumped out by the mixing oil pump 5. After being broken into smaller droplets again by the high-speed rotating impeller of the mixing oil pump 5, a small part is sent to the subsequent separation process of extraction, and most of it is recycled The pipe 10 is returned to the mixing tank 1 to continue mixing;
  • the mixed oil sent by the circulation pipe 10 enters the mixing tank 1 along the horizontal tangential direction from the three inlets (A2.1, A2.2, A2.3) of the upper, middle and lower parts of the mixing tank 1.
  • a clockwise spiral vortex is formed in the tank 1 from top to bottom; at the same time, the mixed oil sent by the asphalt pipe 7 also enters the mixing tank 1 in the horizontal tangential direction, and flows in the direction of the spiral vortex, using two mixed oil flow rates The difference between the soft pitch and the extract is continuously mixed in the spiral flow;
  • the volatilized bitumen oil and gas in the mixing tank 1 enters the oil and gas condenser 2 from bottom to top to be cooled. After the heavy components in the bitumen oil and gas are condensed by the cooling water, they return to the mixing tank along the inner wall of the heat exchange tube of the oil and gas condenser 2 In 1, the non-condensable gas is sent to the exhaust gas treatment system from the flue gas pipe 11 for centralized treatment;

Abstract

本发明涉及一种针状焦生产过程中的油品混合装置及其工艺，包括混合罐、油气冷凝器、沥青泵、萃取剂泵、混合油泵、喷洒头、沥青管、萃取剂管、混合油管、循环管、烟气管、冷却供水管、冷却回水管和喷洒管。其有益效果是：1）利用沥青泵和混合油泵叶轮的高速旋转，反复打碎——混合——再打碎软沥青与萃取液混合相，液液混合效果好；2）水平切线进料，形成自上而下的顺时针螺旋涡流，软沥青和萃取液在螺旋流动中不断混合；3）挥发的沥青油气经油气冷凝器冷凝，有用重组分被冷却冷凝后回流到混合罐，提高了产品收率；4）软沥青与萃取剂在密闭系统内进行混合，没有沥青烟逸散到大气中，对环境的污染小。

Description

一种针状焦生产过程中的油品混合装置及其工艺 技术领域
本发明涉及煤焦化工技术领域，特别是涉及一种针状焦生产过程中的油品混合装置及其工艺。
背景技术
针状焦具有良好的导电导热性能，是生产高功率、超高功率石墨电极的主要材料。目前，生产针状焦的原料沥青大多来源于焦油加工生产的软沥青。针状焦生产过程分为原料预处理、延迟焦化和煅烧三个阶段，其中原料预处理是针状焦生产的关键阶段，在延迟焦化和煅烧条件确定的情况下，原料预处理阶段生产出来的针状焦原料质量越好，生产出的针状焦质量越好。
原料预处理是将软沥青中的喹啉不溶物(QI)除去，从而得到针状焦原料，即精制沥青。目前，原料预处理方法主要有闪蒸法、机械离心法、溶剂萃取法和改质法，其中溶剂萃取法比较成熟，应用也最广泛。溶剂萃取法是先将软沥青与萃取剂混合，再进行分离得到重质混合相和轻质混合相，重质混合相经过分离得到QI含量高的重质沥青和萃取剂，轻质混合相经过分离得到精制沥青和萃取剂。软沥青与萃取剂混合的方法通常是将软沥青和萃取剂直接送入混合罐内，或者经管道混合器混合后，送入混合罐内，经过混合罐的搅拌器搅拌后，由泵送去萃取分离，该方法存在着以下不足：
1)混合罐上的搅拌器填料密封处及搅拌器与混合罐法兰连接处，在运转一定时间后，有黄色沥青烟冒出，污染环境，损害操作人员身体健康，不环保；
2)搅拌器搅拌效果差，尤其是运转一定时间后，软沥青与萃取剂混合不均匀；
3)搅拌器维护频繁，操作人员劳动强度大；
4)管道混合器混合效果差，易堵塞。
发明内容
为克服现有技术缺陷，本发明解决的技术问题是提供一种针状焦生产过程中的油品混合装置及其工艺，软沥青和萃取剂混合充分、均匀，不仅克服了传统搅拌器及管道混合器混合效果差的缺点，而且提高了产品收率，设备维修维护工作量小、运行稳定，操作人员劳动强度小，环境污染小。
为了达到上述目的，本发明采用以下技术方案实现：
一种针状焦生产过程中的油品混合装置，包括混合罐、油气冷凝器、沥青泵、萃取剂泵、混合油泵、喷洒头、沥青管、萃取剂管、混合油管、循环管、烟气管、冷却供水管、冷却回水管和喷洒管，其特征在于，所述油气冷凝器设置在混合罐的顶部，右侧面从上到下依次连接有冷却供水管和冷却回水管，顶部设有烟气管；所述混合罐与沥青泵通过沥青管连接；所述萃取剂泵通过萃取剂管连接接入沥青泵前的沥青管上；所述喷洒头设置在油气冷凝器内，通过喷洒管接入萃取剂泵后的萃取剂管上；所述混合罐底部设有混合油管，在混合油管上设有混合油泵，在混合油泵后的混合油管上设有连接至混合罐的循环管。
所述混合罐上的沥青管入口位于混合罐内壁的水平切线方向上。
所述循环管分别从混合罐的上部、中部和下部与混合罐连接，且循环管的三个入口均位于混合罐内壁的水平切线方向上。
一种针状焦生产过程中的油品混合工艺，包括以下步骤：
1)萃取剂由萃取剂泵送至沥青泵前的沥青管内，与软沥青一起进入沥青泵，利用沥青泵叶轮的高速旋转，将软沥青与萃取剂的混合相打碎成细小液滴，混合后的混合油送入混合罐内；
2)所述混合罐内的混合油由混合油泵抽出，被混合油泵高速旋转的叶轮再次打碎成更细小液滴后，一小部分送至萃取后续分离工序，绝大部分由循环管送回混合罐内；
3)所述循环管送来的混合油从混合罐的上部、中部和下部三个入口沿水平切线方向进入混合罐内，在混合罐内形成自上而下的顺时针螺旋涡流；同时，沥青管送来的混合油也沿水平切线方向进入混合罐内，并顺着螺旋涡流的方向流动，利用两种混合油流速的不同，软沥青和萃取液在螺旋流动中不断进行混合；
4)所述混合罐内挥发的沥青油气由下而上进入油气冷凝器，沥青油气中的重组分被冷却水冷凝后，沿油气冷凝器换热管的内壁回流到混合罐内，不凝气体则由烟气管送至废气治理系统集中治理；
5)所述喷洒管上的切断阀定期打开，通过喷洒头喷洒萃取剂对油气冷凝器的换热管进行清洗，清洗掉换热管上黏附的沥青组分，以避免换热管堵塞。
与现有技术相比，本发明的有益效果是：
1)利用沥青泵和混合油泵叶轮的高速旋转，将软沥青与萃取液的混合相反复地打碎——混合——再打碎，液液混合效果好；
2)混合油沿水平切线方向进入混合罐，在内形成自上而下的顺时针螺旋涡流，软沥青和萃取液在螺旋流动中不断进行混合；
3)混合罐内挥发的沥青油气经油气冷凝器冷凝后，油气中的有用重组分被冷却水冷凝后，沿换热管的内壁回流到混合罐内，提高了产品收率；
4)软沥青与萃取剂在密闭系统内进行混合，没有沥青烟逸散到大气中，对环境的污染小。
附图说明
图1是本发明的工艺流程原理示意图；
图2是本发明沥青管和循环管与混合罐连接接口结构原理示意图。
图中：1-混合罐 2-油气冷凝器 3-沥青泵 4-萃取剂泵 5-混合油泵 6-喷洒头 7-沥青管 8-萃取剂管 9-混合油管 10-循环管 11-烟气管 12-冷却供水管 13-冷却回水管 14-喷洒管
具体实施方式
下面结合附图对本发明的具体实施方式作进一步说明：
见图1、图2所示，本发明涉及的一种针状焦生产过程中的油品混合装置，包括混合罐1、油气冷凝器2、沥青泵3、萃取剂泵4、混合油泵5、喷洒头6、沥青管7、萃取剂管8、混合油管9、循环管10、烟气管11、冷却供水管12、冷却回水管13和喷洒管，所述油气冷凝器2设置在混合罐1的顶部，右侧面从上到下依次连接有冷却供水管12和冷却回水管13，顶部设有烟气管11；所述混合罐1与沥青泵3通过沥青管7连接；所述萃取剂泵4通过萃取剂管8连接接入沥青泵3前的沥青管7上；所述喷洒头6设置在油气冷凝器2内，通过喷洒管14接入萃取剂泵4后的萃取剂管8上；所述混合罐1底部设有混合油管9，在混合油管9上设有混合油泵5，在混合油泵5后的混合油管9上设有连接至混合罐1的循环管10。
所述混合罐1上的沥青管7入口A1位于混合罐1内壁的水平切线方向上(见图2所示)。
所述循环管10分别从混合罐1的上部、中部和下部与混合罐1连接，且循环管10的三个入口(A2.1、A2.2、A2.3)均位于混合罐1内壁的水平切线方向上(见图2所示)。
一种针状焦生产过程中的油品混合工艺，包括以下步骤：
1)萃取剂由萃取剂泵4送至沥青泵3前的沥青管7内，与软沥青一起进入沥青泵3，利用沥青泵3叶轮的高速旋转，将软沥青与萃取剂的混合相打碎成细小液滴，混合后的混合油送入混合罐1内；
2)所述混合罐1内的混合油由混合油泵5抽出，被混合油泵5高速旋转的叶轮再次 打碎成更细小液滴后，一小部分送至萃取后续分离工序，绝大部分由循环管10送回混合罐1内继续混合；
3)所述循环管10送来的混合油从混合罐1的上部、中部和下部三个入口(A2.1、A2.2、A2.3)沿水平切线方向进入混合罐1内，在混合罐1内形成自上而下的顺时针螺旋涡流；同时，沥青管7送来的混合油也沿水平切线方向进入混合罐1内，并顺着螺旋涡流的方向流动，利用两种混合油流速的不同，软沥青和萃取液在螺旋流动中不断进行混合；
4)所述混合罐1内挥发的沥青油气由下而上进入油气冷凝器2被冷却，沥青油气中的重组分被冷却水冷凝后，沿油气冷凝器2换热管的内壁回流到混合罐1内，不凝气体则由烟气管11送至废气治理系统集中治理；
5)所述喷洒管14上的切断阀定期打开，通过喷洒头6喷洒萃取剂对油气冷凝器2的换热管进行清洗，清洗掉换热管上黏附的沥青组分，以避免换热管堵塞。
以上所述，仅为本专利的具体实施方式，但本专利的保护范围并不局限于此，对于本技术领域的技术人员来说，根据本专利的技术方案作出若干改进和变型，均视为本专利的保护范围。

Claims (4)

  1. 一种针状焦生产过程中的油品混合装置，包括混合罐、油气冷凝器、沥青泵、萃取剂泵、混合油泵、喷洒头、沥青管、萃取剂管、混合油管、循环管、烟气管、冷却供水管、冷却回水管和喷洒管，其特征在于，所述油气冷凝器设置在混合罐的顶部，右侧面从上到下依次连接有冷却供水管和冷却回水管，顶部设有烟气管；所述混合罐与沥青泵通过沥青管连接；所述萃取剂泵通过萃取剂管连接接入沥青泵前的沥青管上；所述喷洒头设置在油气冷凝器内，通过喷洒管接入萃取剂泵后的萃取剂管上；所述混合罐底部设有混合油管，在混合油管上设有混合油泵，在混合油泵后的混合油管上设有连接至混合罐的循环管。
  2. 根据权利要求1所述的一种针状焦生产过程中的油品混合装置，其特征在于，所述混合罐上的沥青管入口位于混合罐内壁的水平切线方向上。
  3. 根据权利要求1所述的一种针状焦生产过程中的油品混合装置，其特征在于，所述循环管分别从混合罐的上部、中部和下部与混合罐连接，且循环管的三个入口均位于混合罐内壁的水平切线方向上。
  4. 实现权利要求1所述的一种针状焦生产过程中的油品混合工艺，其特征在于，包括以下步骤：
    1)萃取剂由萃取剂泵送至沥青泵前的沥青管内，与软沥青一起进入沥青泵，利用沥青泵叶轮的高速旋转，将软沥青与萃取剂的混合相打碎，混合后的混合油送入混合罐内；
    2)所述混合罐内的混合油由混合油泵抽出，被混合油泵高速旋转的叶轮再次打碎后，一小部分送至萃取后续分离工序，绝大部分由循环管送回混合罐内；
    3)所述循环管送来的混合油从混合罐的上部、中部和下部三个入口沿水平切线方向进入混合罐内，在混合罐内形成自上而下的顺时针螺旋涡流；同时，沥青管送来的混合油也沿水平切线方向进入混合罐内，并顺着螺旋涡流的方向流动；
    4)所述混合罐内挥发的沥青油气由下而上进入油气冷凝器，沥青油气中的重组分被冷却水冷凝后，沿油气冷凝器换热管的内壁回流到混合罐内，不凝气体则由烟气管送至废气治理系统集中治理；
    5)所述喷洒管上的切断阀定期打开，通过喷洒头喷洒萃取剂对油气冷凝器的换热管进行清洗。
PCT/CN2020/111194 2019-12-23 2020-08-26 一种针状焦生产过程中的油品混合装置及其工艺 WO2021128902A1 (zh)

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