Oil switching valve of delayed coking device and feeding operation method of oil switching valve

Abstract

The invention discloses an oil switching valve and a reactor feeding operation method thereof. The oil switching valve is a three-way ball valve and is provided with a valve body, a valve element, a valve cover, a valve rod, packing, a packing gland and a rotary executing mechanism. The three-way ball valve is provided with two oil inlets and an oil outlet, the two oil inlets are located on the side portion of the valve body, the oil outlet is located at the bottom of the valve body, and a fixed included angle is formed between the two oil inlets. An L-shaped medium runner is arranged in the valve element, and an inlet of the medium runner is located in the side face of the valve element. The oil material switching valve can be used for sequentially and alternately feeding two different oil materials into the reactors, the device takes two or more reactors as a group, each reactor adopts an independent oil material switching valve for switching feeding, and the feeding reaction and other operations of the reactors are completed according to the operation cycle of the device and the continuous production requirements of the process.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of petrochemical industry, and particularly relates to an oil switching valve used in a delayed coking device. BACKGROUND

[0002] In the general process flow of a delayed coking device in a refinery, an oil switching valve is usually installed at the joint of the feed pipe before two reactors. The oil switching valve is usually a four-way valve, and a conventional four-way valve is usually provided with one oil inlet and three oil outlets, which are used to switch the high-temperature oil from the upstream heating furnace so that the oil alternately enters the two reactors. In this way, when one reactor is coking, the other reactor or reactors are preheated, cooled, hydraulically decoked, pressure tested, and warmed up, so as to ensure the continuous production of the delayed coking device.

[0003] For a delayed coking device feed system or a similar feed system of a new chemical material process device including two or more than two oil feed, in order to meet the requirement that two or more than two feed sequentially and respectively enter each reactor, according to the conventional delayed coking process, each conventional four-way valve has only one oil inlet, and each oil needs at least one conventional four-way valve. When two or more than two oil feed is operated, in order to meet the requirement that two or more than two oil alternately and sequentially enter each reactor and undergo delayed coking reaction, each coking tower needs at least two or more than two oil switching valves. For a production series of two or more than two coking towers, each reactor needs to share two or more than two conventional four-way valves with other reactors (one or more than one reactor). In this way, on the one hand, due to the structure of the conventional four-way valve having only three oil outlets, when the number of reactors in the two or more than two feed series in the device exceeds three, the three oil outlets are not enough, and the conventional four-way valve is no longer suitable for more than three reactors.

[0004] On the other hand, when two or more than two reactors are provided for two or more than two feed, two or more than two four-way valves need to be provided for the two or more than two oil feed, and two or more than two feed pipes of the two or more than two oil from the two or more than two four-way valves need to be connected in parallel to the feed pipe to the reactor inlet, so as to realize the switching of the two or more than two oil feed.

[0005] Taking two oil feed as an example, at least two conventional four-way valves are needed for two or more than two reactors to alternately and sequentially feed, and two feed pipes of the two oil from the two conventional four-way valves need to be connected in parallel to the feed pipe to the reactor inlet, so as to realize the alternately and sequentially feeding of the two different oils.

[0006] Thus, for two or more feeds, each reactor needs to be provided with 2 or more conventional four-way valves in parallel to feed in turn and alternately. Sometimes, due to different pressure and temperature conditions for the two or more feeds to carry out delayed coking reactions, when the reactor feed is switched from one oil to another from the outlets of different conventional four-way valves, a certain degree of pressure fluctuation and temperature change can occur, thereby causing the pressure fluctuation and temperature change to the entire reactor feed system and its upstream process flow. This brings about such as: operating pressure fluctuation and temperature change of the heating furnace, in turn, resulting in control change requirements, and fluctuation change of the outlet pressure of the radiant feed pump, etc. In order to adapt to such pressure fluctuation or temperature change of the reactor feed system, the oil feed system has to be designed with appropriate design schemes or measures. For example, the outlet piping of the radiant feed pump is designed with an outlet + backflow regulating valve system, or the design scheme of the variable frequency speed regulation of the radiant feed pump, etc. Thus, not only does it cause the reactor feed system to be complicated to operate, but also in the relatively small space below the reactor, oil feed pipes from the outlets of 2 or more conventional four-way valves in parallel are needed. The more the types of feeds, the more the conventional four-way valves needed to be provided in parallel, and the more the feed pipes needed to be provided in parallel. The temperature of the reactor oil feed is often around 500°C, and under such high temperature conditions, the oil switching valve and its oil isolation valve and high temperature feed pipe are connected in parallel in the limited space below the reactor, which causes certain difficulties in piping arrangement and design. Moreover, the reactor and its feed system under different operating conditions are prone to cause pressure fluctuation and temperature change, thereby adversely affecting the operation of the upstream process system of the reactor feed system, including the design of the heating furnace, the radiant feed pump, etc. Thus, not only can it increase the one-time investment cost, but also the upstream system is prone to be affected by pressure fluctuation, causing pressure shock and vibration, which can easily cause damage, leakage, etc. of the related pipes, fittings and valves under pressure shock and vibration, thereby adversely affecting the long-term stable operation of the device, making the operation of the entire device and the oil switching valve related system piping more complicated, reducing the operation reliability, and increasing the maintenance amount and cost. SUMMARY

[0007] The application provides a delayed coking device oil switching valve and a feeding method thereof, and solves the problems of the prior art, such as the complexity of the pipeline system design, the pressure fluctuation and temperature change of the pipeline system, and the technical problems caused by the reactor feeding system.

[0008] To achieve the above object, the technical scheme of the application is as follows.

[0009] The oil switching valve is characterized in that the oil switching valve is a three-way ball valve, the valve is provided with a valve body 1, a valve core 2, a valve cover 7, a valve rod 8, packing 4, a packing gland 10 and a rotary actuator 9, the valve core 2 is located in the valve body 1, the valve rod 8 is mechanically fixedly connected with the valve core 2, the oil switching valve is provided with two oil inlets 5 and one oil outlet 6, the two oil inlets 5 are located on the side of the valve body 1, and the oil outlet 6 is located at the bottom of the valve body 1; the rotary actuator 9 is installed on the valve body, the rotary actuator 9 drives the rotation of the valve rod 8 and the valve core 2, and each switching rotation is a fixed included angle, so that the oil feeding can be switched from one oil inlet 5 to another oil inlet 5.

[0010] The oil switching valve is further characterized in that the feeding from any oil inlet 5 is discharged from one oil outlet 6 of the valve.

[0011] The oil switching valve is further characterized in that the two oil inlets 5 are adjacent and have a fixed included angle between each other, and the fixed included angle can be selected from 90° to 120°; the valve core 2 is internally provided with an L-shaped medium flow channel, the medium flow channel inlet is located on the side of the valve core 2, and the medium flow channel outlet is located at the bottom of the valve core 2.

[0012] The oil switching valve is further characterized in that a hard sealing elastic valve seat assembly 11 is embedded on the side of the inner cavity of the valve body 1 around each oil inlet 5 of the valve body 1, and each hard sealing elastic valve seat is a hard sealing elastic valve seat. Each hard sealing elastic valve seat and the spherical surface outside the medium flow channel outlet of the valve core 2 form two sealing surfaces opposite to each other, and cooperatively form a spherical surface sealing.

[0013] The oil switching valve for delayed coking device further has the following features: the valve seat assembly 11 is embedded in the valve body 1 around the oil inlet 5, and the valve seat assembly 11 is composed of a valve seat 111, an outer packing seal ring 112, an inner packing seal ring 113, an inner pressure ring 114, an outer pressure ring 115 and a spring 116. The valve seat 111 is a whole annular ring, the inner circumferential diameter of which is the same as the diameter of each oil inlet 5 on the valve body 1, and after assembly, the inner circumferences of each oil inlet 5 on the valve body 1 together form a valve inlet channel; the outer circumference of the valve seat 111 is provided with two stepped shafts 117 which are lower than each other, and the stepped shafts 117 form cavities with the inwardly concave inner walls of each oil inlet 5 on the valve body 1, and the inner packing seal ring 113, the inner pressure ring 114, the spring 116, the outer pressure ring 115 and the outer packing seal ring 112 are sequentially assembled from inside to outside in the cavities; the front end of the valve seat 111 is in contact with the valve core 2, and the rear end of the valve seat 111 is provided with a expansion joint 118 with the valve body 1.

[0014] The oil switching valve for delayed coking device further has the following features: a gas blowing interface 3 is arranged on the valve body 1, a gas blowing channel 31 is arranged on the valve body, and the gas from the gas blowing interface 3 passes through the small holes on the outer pressure ring 115, enters the cavity accommodating the spring 116 between the outer pressure ring 115 and the inner pressure ring 114 through the gas blowing channel 31.

[0015] The application also protects a reactor feed operation method for a delayed coking device using the above oil switching valve.

[0016] The application also protects a reactor feed operation method for a delayed coking device using the above oil switching valve.

[0017] The application also protects a reactor feed operation method for a delayed coking device using the above oil switching valve.

[0018] The application also protects a reactor feed operation method for a delayed coking device using the above oil switching valve.

[0019] The first stage: feeding the reactor with the reactor feed 1; through switching of the oil switching valve, the reactor feed passes through the first feeding main pipe, the first feeding branch pipe, the oil switching valve, the feeding pipe and the feeding isolation valve thereon into the reactor, and the feeding is accompanied by reaction;

[0020] The second stage: through switching of the oil switching valve, the oil feed is switched from the reactor feed 1 to the reactor feed 2, so that the reactor feed 2 passes through the second feeding main pipe, the second feeding branch pipe, the oil switching valve, the feeding pipe and the feeding isolation valve thereon into the reactor as described above, and the feeding is accompanied by reaction;

[0021] The third stage: according to the operation cycle of the device and the continuous production requirements of the process, the feeding is sequentially and alternately completed through the corresponding oil switching valve of each reactor; while the reactor feed 1 of one reactor is being fed and reacted, one of the other two reactors is being fed with the reactor feed 2, and the other is being operated after the feeding reaction, such as preheating, cooling, hydraulic decoking, pressure testing, tower warming and the like.

[0022] The feeding reactions of the two kinds of oil are continuously carried out, and when the reactor is in the feeding reaction stage, the reactor top oil gas is transported to the downstream fractionation system through the oil gas pipe for further fractionation, at this time, the reactor top is communicated with the fractionation system. When the reactor is in the preheating, cooling, hydraulic decoking, pressure testing and the like, the reactor top is cut off from the fractionation system. The coking material in the reactor is discharged into the coking pool or the dehydration bin through the hydraulic decoking operation from the bottom of the reactor. The above stages are continuously cycled.

[0023] When feeding n reactors, any one of the n reactors can be sequentially fed according to the above first and second stages in time periods, while (n-x) reactors are being fed and reacted, the other x reactors are being operated after the feeding reaction, such as preheating, cooling, hydraulic decoking, pressure testing, tower warming and the like.

[0024] The oil switching valve and the feeding operation method of the present application can be used in the reactor feeding system of other petroleum chemical and chemical fields in addition to the reactor of the delayed coking device.

[0025] The present application has the following beneficial effects:

[0026] 1) The oil switching valve proposed in the present application adopts a three-way ball valve scheme, instead of the conventional four-way ball valve in the conventional delayed coking device, which can meet the process operation requirements of feeding two different oils into n reactors in sequence and alternately;

[0027] 2) The oil switching valve and reactor feeding method thereof proposed in the present application is one-to-one corresponding to the reactor, and one oil switching valve is only used for one reactor. Compared with the conventional design, i.e. two or more than two traditional four-way valves are used for the alternate feeding of each reactor, the oil switching valve is not easily affected by the pressure fluctuation and temperature change caused by the different pressure and temperature of different reactor oil feeding, and the pressure and temperature conditions between different feedings can be adapted by the pressure adjustment or temperature adjustment of the feeding system of each reactor, thereby reducing the influence on the reactor feeding system and the related feeding system upstream thereof.

[0028] 3) The oil switching valve and reactor feeding operation method thereof proposed in the present application can realize the sequential or alternate feeding of two different oils into the reactor, and can meet the delayed coking device reactor feeding operation method of two different oils or the feeding operation method of similar devices, the combination mode of the feeding is various, and the operation is flexible and changeable. It can be adapted to various new process and new material reactor feeding processing process methods of petroleum and chemical industry similar to the method.

[0029] The present application will be further described in detail below in combination with the drawings and specific embodiments. The drawings and specific embodiments do not limit the scope of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a schematic diagram of a three-way ball valve overall plan view from the top;

[0031] Figure 2 It is Figure 1 A-A sectional view schematic diagram;

[0032] Figure 3 It is Figure 1 A three-way ball valve overall view B schematic diagram;

[0033] Figure 4 It is a valve seat structure enlarged view schematic diagram;

[0034] Figure 5 It is a two-oil three-reactor feeding flow schematic Figure 1 ;

[0035] Figure 6 It is a two-oil three-reactor feeding flow schematic Figure 2 .

[0036] The reference signs shown in the figure are: 1-valve body, 2-valve core, 3-gas purge interface, 4-valve stem packing, 5-oil inlet, 6-oil outlet, 7-valve cover, 8-valve stem, 9-rotary actuator, 10-packing gland, 11-valve seat assembly, 31-gas purge channel, 111-valve seat, 112-outer packing seal ring, 113-inner packing seal ring, 114-inner pressure ring, 115-outer pressure ring, 116-spring, 117-step shaft, 118-expansion joint, 200-bypass block valve, 201-first feed main pipe, 202-second feed main pipe, 203-bypass pipe, 204A / B / C-reactor A / B / C, 205A / B / C-oil feed pipe A / B / C, 206A / B / C-first feed branch pipe A / B / C, 207A / B / C-second feed branch pipe A / B / C, 208A / B / C-oil switching valve A / B / C, 209A / B / C-oil block valve A / B / C, 210A / B / C-oil gas pressure control valve A / B / C, 211-first feed main pipe block valve, 212-second feed main pipe block valve, 213A / B / C-oil gas branch pipe A / B / C, 214A / B / C-oil gas block valve A / B / C, 215-oil gas ring valve, 216-oil gas main pipe. DETAILED DESCRIPTION

[0037] The technical solutions of the present application are further described below in combination with the drawings.

[0038] The oil switching valve is a three-way ball valve, which is provided with a valve body 1, a valve core 2, a valve cover 7, a valve stem 8, packing 4, a packing gland 10 and a rotary actuator 9. The valve core 2 is located in the valve body 1, and the valve stem 8 is mechanically fixedly connected with the valve core 2. The oil switching valve is provided with two oil inlets 5 and one oil outlet 6. The two oil inlets 5 are located on the side of the valve body 1, and the oil outlet 6 is located at the bottom of the valve body 1. The two oil inlets 5 are adjacent to each other and form a fixed included angle therebetween, which can be selected between 90° and 120°. The valve core 2 is internally provided with an L-shaped medium flow channel. The inlet of the medium flow channel is located on the side of the valve core 2, and the outlet of the medium flow channel is located at the bottom of the valve core 2. An elastic sealing valve seat assembly 11 is embedded on the inner side of the valve body 1 around the two oil inlets 5. The rotary actuator 9 is installed on the valve body, and the center line of the valve stem 8 is perpendicular to the horizontal plane formed by the center lines of the two oil inlets 5. The rotary actuator 9 drives the rotation of the valve stem 8 and the valve core 2. Each switching rotation is a fixed included angle, so that the oil feed can be switched from one oil inlet 5 to another oil inlet 5. Regardless of the feed from which of the two oil inlets 5, the oil is discharged from one oil outlet 6 of the valve. By virtue of this structural feature of the oil switching valve, the oil switching valve can be applied to the reactor feed operation method in which two kinds of oil are alternately fed.

[0039] As shown in FIG. 2, the oil switching valve is connected with the oil feed pipes 205A / B / C, the first feed branch pipes 206A / B / C, the second feed branch pipes 207A / B / C, the oil switching valves 208A / B / C, the oil block valves 209A / B / C, the oil gas pressure control valves 210A / B / C, the oil gas branch pipes 213A / B / C, the oil gas block valves 214A / B / C, the oil gas ring valve 215 and the oil gas main pipe 216. Figure 5The two oil feed flow process of three reactors is shown. After the two oil from the heating furnace is heated, it enters the oil feed manifold 201 and 202 respectively. For each reactor, an oil switching valve is provided to switch the feed. For example, for the reactor 204A, an oil switching valve 208A is provided, with two oil inlets 5 connected to the two feed branches 206A and 207A upstream of the reactor, and an oil outlet 6 connected to the feed pipe 205A downstream of the reactor and a feed isolation valve 205A upstream of the feed pipe. The two different oils enter the oil switching valve 208A through the first and second feed manifolds 201 and 202, respectively, and then switch the feed through the oil switching valve 208A, and then enter the corresponding reactor 204A in turn through the oil feed pipe 205A and the feed isolation valve 209A upstream of the oil feed pipe.

[0040] A hard sealing elastic valve seat assembly 11 is embedded on the inner cavity side of the valve body 1 around each valve oil inlet 5 of the valve body 1, which is an elastic metal valve seat. Each hard sealing elastic valve seat forms two sealing surfaces with the spherical surface outside the medium flow channel outlet of the valve core 2, which cooperate to form a spherical seal. The valve seat assembly 11 is embedded on the valve body 1 around the valve body outlet 5, and the valve seat assembly 11 is composed of a valve seat 111, an outer packing seal ring 112, an inner packing seal ring 113, an inner pressure ring 114, an outer pressure ring 115 and a spring 116. The valve seat 111 is a circular ring, and its inner circumference diameter is the same as the diameter of each oil inlet 5 of the valve body 1, and after assembly, it forms a valve inlet passage with the inner circumference of each oil inlet 5 of the valve body 1. The outer circumference of the valve seat 111 is provided with two stepped shafts 117, which form a cavity with the inwardly concave inner wall of each oil inlet 5 of the valve body 1, and the inner packing seal ring 113, the inner pressure ring 114, the spring 116, the outer pressure ring 115 and the outer packing seal ring 112 are sequentially assembled from inside to outside in the cavity. The valve body 1, the valve core 2, the valve stem 8 and the valve seat 111 are made of high-temperature resistant alloy steel, the spring 116 in the valve seat assembly 11 is made of high-temperature resistant alloy steel or other types of high-temperature resistant elastic elements, and the surfaces of the valve seat 111 and the valve core 2 are cooperated with each other and are processed by surface hardening, such as chromium plating or hard alloy spraying, to improve the wear resistance and prevent wear. The front end of the valve seat 111 contacts the valve core 2, and the rear end of the valve seat 111 leaves a expansion joint 118 with the valve body 1.

[0041] A gas purge port 3 is provided on the valve body 1, and a gas purge channel 31 is provided on the valve body, through which the gas from the gas purge port 3 passes through the small holes on the outer pressure ring 115, and enters the cavity between the outer pressure ring 115 and the inner pressure ring 114, in which the spring 116 is accommodated. For high-temperature dust-containing environments, such as the coke dust-containing environment in a delayed coking device, steam can be used to purge the above-mentioned cavity. The steam flow can be appropriately controlled or intermittent purging can be implemented to prevent coke dust or similar dust from entering the cavity containing the spring.

[0042] The device uses 2 or more reactors as a group, and each reactor uses an independent oil switching valve to switch the feed. For example, as shown in Figure 5 , two oil three reactor feed flow schemes are used as an example, and three reactors are used as a group. Each reactor 204A, 204B or 204C uses an independent oil switching valve 208A, 208B or 208C to switch the oil. Two different oils can be switched by the oil switching valve 208A / B / C to be fed to the opposite reactor 204A / B / C in turn. In addition, a bypass pipeline 203 with a bypass isolation valve 200 is connected to the reactor top for starting up the warm tower. An independent oil gas pressure control valve 210A / B / C is provided on the oil gas pipeline of each reactor 204A / B / C, which is used to adjust the pressure of each reactor 204A / B / C to meet the different reactor operating pressure requirements when different oils are fed. The overhead oil gas is discharged to the device fractionation system through the oil gas pipeline and the valve on it, and each reactor has an independent overhead oil gas discharge path. For example, the reactor 204A, the overhead oil gas passes through the overhead oil gas branch pipe 213A and the oil gas pressure control valve 210A and the oil gas isolation valve 214A installed thereon, and then passes through the overhead oil gas main pipe 216 and the oil gas ring valve 215 installed thereon to be discharged to the fractionation system of the device. The corresponding overhead oil gas branch pipe 213A, 213B or 213C of each reactor 204A, 204B or 204C is provided with an independent oil gas pressure control valve 210A, 210B or 210C, respectively, which is used to adjust the pressure of each reactor 204A, 204B or 204C to meet the different reactor operating pressure requirements when different oils are fed.

[0043] As an alternative, on the basis of the scheme as shown in Figure 5 , feed isolation valves 211 and 212 can be installed on the first and second feed main pipes 201 and 202 leading to the last reactor 204C, respectively, and the feed isolation valves 211 and 212 are installed near the first and second feed branch pipes 206C and 207C, respectively, as shown in Figure 6 .

[0044] For the reactor feed method of two kinds of oil entering three reactors, the device continuously produces and switches the oil in three stages. In the first stage, reactor feedstock 1 is fed into reactors 204A / B / C. By switching the respective independent oil switching valves 208A / B / C, reactor feedstock 1 is fed into reactors 204A / B / C through the first feed main pipe 201, the first feed branch pipe 206A / B / C, the oil switching valve 208A / B / C, the feed pipe 205A / B / C, and the feed cutoff valve 209A / B / C thereon, as described above, and the feeding is accompanied by reaction. At this time, the oil switching valve 208A / B / C is a three-way ball valve as described in claims 1, 2, and 3. In the second stage, by switching the oil switching valve 208A / B / C, the oil feed is switched from reactor feedstock 1 to reactor feedstock 2, so that reactor feedstock 2 is fed into reactors 204A / B / C through the second feed main pipe 202, the second feed branch pipe 207A / B / C, the oil switching valve 208A / B / C, the feed pipe 205A / B / C, and the feed cutoff valve 209A / B / C thereon, as described above, and the feeding is accompanied by reaction. In the third stage, according to the device operation cycle and process continuous production requirements, the feeding is sequentially and alternately completed according to the above two steps through the corresponding oil switching valve 208A / B / C of each reactor 204A / B / C. While one of the three reactors 204A / B / C is feeding and reacting with reactor feedstock 1, one of the other two reactors 204A / B / C is feeding and reacting with reactor feedstock 2, and the other reactor is performing other operations after the completion of the feeding reaction, such as preheating, cooling, and hydraulic decoking, pressure testing, and tower warming. In turn, according to the device operation cycle and process continuous production requirements, the above three stages of operation are sequentially completed to sequentially and alternately complete the feeding and reaction of the two feeds in the three reactors 204A / B / C, and then sequentially and alternately complete the preheating, cooling, and hydraulic decoking, pressure testing, and tower warming operations. The feeding and reaction of the two kinds of oil are continuously carried out, and when the reactor is in the feeding and reaction stage, the reactor overhead oil gas is transported to the downstream fractionation system through the oil gas pipe for further fractionation, at which time the reactor overhead is connected to the fractionation system. When the reactor is in the preheating, cooling, hydraulic decoking, and pressure testing stages, the reactor is disconnected from the fractionation system and removed from the reaction-fractionation system. The coking material in the reactor is discharged into the coking pool or dehydration bin through hydraulic decoking operation from the bottom of the reactor. The above stages are continuously cycled.

[0045] According to the device operation cycle and process continuous production requirements, for two different oil feeds, multiple reactors can be provided, for example, n reactors are used. As described above, the device can be used for the continuous production of two kinds of oil, and the device can be used for the continuous production of n kinds of oil. Figure 5 and Figure 6The reactor feeding method shown is similar, and the reactor feeding can be divided into time periods and sequentially fed into any one of n reactors in the first and second stages described above for the feeding method of two oil feeds into three reactors, while (n-x) reactors are fed and reacted, the other x reactors perform other operations after the feeding and reaction are completed, such as preheating, cooling, and hydraulic decoking, pressure testing, tower warming, and the like. The number of reactors n can be greater than 3 or less than 3, and to ensure continuous production of the device, it is generally required to be greater than or equal to 2. The feeding method and feeding operation stages are similar to the above method.

[0046] The above is only a typical embodiment of the present application, and it should be noted that for those skilled in the art, without departing from the principles of the present application, a number of improvements or replacements can be made, and these improvements or replacements should also be considered as the protection scope of the present application.

Claims

1. A coke tower oil switching valve, characterized in that: The oil switching valve is a three-way plug valve, comprising a valve body, plug, gas purging port, packing, valve cover, valve stem, bracket, packing gland, lifting actuator, and rotating actuator. The valve stem is mechanically fixed to the plug. The oil switching valve has two oil inlets and one oil outlet. Both oil inlets are located on the side of the valve body, and the oil outlet is located at the bottom of the valve body. The two oil inlets are adjacent to each other on the side of the valve body. The plug has an L-shaped medium flow channel inside, with the medium flow channel inlet located on the side of the plug and the medium flow channel outlet located at the bottom of the plug. The lifting actuator and rotating actuator are mounted on the valve body.

2. The coke tower oil switching valve according to claim 1, characterized in that: The two oil inlets are adjacent to each other and form a fixed angle of 90° to 120° between them.

3. The coke tower oil switching valve according to claim 1, characterized in that: Feeding from any oil inlet results in discharging from one oil outlet of the valve.

4. The coke tower oil switching valve according to claim 1, characterized in that: The valve switching operation first involves lifting the cock via a lifting actuator to disengage the cock from the valve body; Secondly, the valve stem and the valve plug are driven to rotate by the rotary actuator. Each rotation is at a fixed angle, allowing the oil feed to switch from one oil inlet to another. Then, the valve plug is driven to descend onto the valve body by the lifting actuator, completing the switching operation from one oil inlet to another.

5. The coke tower oil switching valve according to claim 1, characterized in that: The stopcock is located in the inner cavity of the valve body. The stopcock is an inverted truncated cone with a cone angle of 15 to 30 degrees. A stopcock medium flow channel inlet sealing surface is provided on the outer surface of the stopcock around the medium channel inlet. It is an outwardly convex annular sealing surface on the cone surface of the stopcock.

6. The coke tower oil switching valve according to claim 1, characterized in that: A valve body oil inlet sealing surface is provided around each oil inlet on the inner side of the valve body. It is an inwardly concave annular sealing surface on the conical surface inside the valve body. The sealing surface on the plug contacts any oil inlet sealing surface on the valve body, and the two are opposite to each other and cooperate to form a seal.

7. The coke tower oil switching valve according to claim 1, characterized in that: The plug valve is equipped with a gas purging port, which is connected to a gas purging channel. The outlets of each gas purging channel are located on the lower surface of the valve cover, the inner side of the valve body, and the packing, respectively.

8. A method for feeding coke towers, comprising n coke towers as a group, wherein each coke tower uses an oil-feed switching valve as described in sections 1-7 to switch the feed, characterized in that: Each coke tower is paired with an oil switching valve; each coke tower uses its own independent oil switching valve to switch feeds; the oil switching valve is a three-way plug valve, with its two oil inlets connected to two upstream feed branch pipes, and its oil outlet connected to a downstream feed pipe and a feed shut-off valve thereon; two different oils enter the oil switching valve through the first and second feed mains, then through the two feed branch pipes, and are switched at the oil switching valve. The oils then pass through the discharge shut-off valve and the oil feed pipe, alternately entering the corresponding coke tower; each coke tower has its own independent oil and gas pressure control valve on the top oil and gas pipeline, used to regulate the coke tower pressure to meet the different coke tower operating pressure requirements when different oils are fed.

9. The method for feeding a coke tower according to claim 8, characterized in that: The number of coke towers is 2-15.

10. The method for feeding a coke tower according to claim 8, characterized in that: For the reactor feeding method where two types of oil are fed into three coking towers respectively, the oil is switched in three stages during continuous production: The first stage is the feeding operation of raw material 1 into the coke tower. By switching the oil switching valve, the raw material 1 of the coke tower enters the coke tower through the first feed main pipe, the first feed branch pipe, the oil switching valve, the feed pipeline and the feed isolation valve on it, and the reaction occurs at the same time as feeding. In the second stage, the oil feed is switched from coke tower feed 1 to coke tower feed 2 by switching the oil feed switching valve. The coke tower feed 2 enters the coke tower through the second feed main pipe, the second feed branch pipe, the oil feed switching valve, the feed pipeline and the feed isolation valve on it, and the reaction occurs at the same time as the feed. In the third stage, according to the unit operation cycle and the requirements of continuous production, the feed is carried out alternately through the corresponding oil switching valve of each coking tower. While the feed reaction of coking tower feed 1 is carried out in one of the other two coking towers, the feed reaction of coking tower feed 2 is carried out in one of the other two coking towers, and the other tower carries out other operations after the feed reaction is completed.

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