CN107937004B

CN107937004B - Petroleum coke conveying, dehydrating and storing equipment for delayed coking

Info

Publication number: CN107937004B
Application number: CN201711098720.6A
Authority: CN
Inventors: 刘志平; 李喜国; 乔幸伟; 刘亮
Original assignee: Luoyang Jianguang Special Equipment Co ltd
Current assignee: Luoyang Jianguang Special Equipment Co ltd
Priority date: 2017-11-09
Filing date: 2017-11-09
Publication date: 2023-10-17
Anticipated expiration: 2037-11-09
Also published as: CN107937004A

Abstract

A petroleum coke conveying, dewatering and storing device for delayed coking comprises a coke water separator, a dewatering tank, a purified water temporary storage tank, a coke conveyor, a coke storage tank and the like. The coke water separator is characterized in that a horizontal conveying mechanism suspended above the inner bottom surface of the coke water separator body is arranged in the coke water separator body, the horizontal conveying mechanism is provided with sieve holes through which water passes, the tail end of the horizontal conveying mechanism is connected to a coke storage tank through a coke conveyor, and a coke water mixture output by a water outlet at the lower part of the coke water separator body is conveyed to a dehydration tank. The dehydration tank is connected to the coke storage tank and the purified water temporary storage tank respectively. The device changes the centralized dehydration mode of the coke into a distributed processing mode of separately dehydrating the granular coke with different sizes, has higher processing speed and higher efficiency, greatly reduces the amount of the coke to be processed by single components such as a dehydration tank, and is more beneficial to process optimization control. The overlapped buffer action of the volumes of all parts can effectively prevent overflow when the coke discharged from the coke tower instantaneously or the water quantity is overlarge, and the continuous operation of the petroleum coke closed conveying system is ensured.

Description

Petroleum coke conveying, dehydrating and storing equipment for delayed coking

Technical Field

The application relates to a petroleum coke treatment system of a delayed coking device, in particular to petroleum coke conveying, dehydrating and storing equipment for delayed coking.

Background

The delayed coking process is one kind of petroleum processing technology, and is to use heavy oil as material, heat the material in heating furnace to coking reaction temperature of 500 deg.c and to enter coke tower for coking reaction. After the reaction is finished, the high-temperature coke is subjected to steam and water cooling, and then is subjected to high-pressure water cutting and decoking. The coke and water mixture generated in the process is discharged into a coke tank for separating the coke from the water. The mixture of coke and water carries a large amount of malodorous chemical substances mainly including Volatile Organic Compounds (VOC) such as hydrogen sulfide, thiols, thioethers, hydrocarbons, organic halogen derivatives and the like, and most of the substances have great harm to human health. With the importance of the national environmental protection requirements, the realization of the closed conveying of petroleum coke is particularly important.

At present, when the coke and water mixture generated in the decoking process is treated, a centralized treatment mode is adopted, and all the generated coke is sent into a dewatering bin or a dewatering tank for dewatering treatment. The individual processes filter the char mixture prior to feeding it into the dehydration tank to reduce the amount of water fed into the dehydration tank, but ultimately still concentrate the dehydration of the char. On the one hand, the treatment method has the advantages that the amount of the coke water mixture to be treated in the dewatering bin or the dewatering tank is very large, and the treatment speed is low; on the other hand, the centralized processing method requires a large processing device, has high requirements on field area, layout and the like, is difficult to realize, and has high equipment cost.

Disclosure of Invention

The application aims to solve the technical problem of providing petroleum coke conveying, dewatering and storing equipment for delayed coking, which adopts step-by-step treatment to accelerate the treatment speed of a coke water mixture after hydraulic coke cutting.

The technical scheme adopted by the application for solving the technical problems is as follows: a petroleum coke conveying, dewatering and storing device for delayed coking comprises a coke water separator for receiving a coke water mixture discharged from a coke tower, a coke conveyor, a dewatering tank for dewatering coke, a coke storage tank for storing coke and a clean water temporary storage tank for storing reclaimed water; the coke outlet and the reclaimed water outlet of the dehydration tank are respectively connected to a coke storage tank and a purified water temporary storage tank, and the device is characterized in that: the coke-water separator is provided with a horizontally arranged machine body, a horizontal conveying mechanism suspended above the inner bottom surface of the machine body is arranged in the machine body, the horizontal conveying mechanism is provided with a sieve hole through which water passes, the tail end of the horizontal conveying mechanism is connected to a coke storage tank through a coke conveyor, the lower part of the coke-water separator body is provided with a water outlet, and a coke water mixture output by the water outlet is directly or transitionally conveyed to a dehydration tank.

The water outlet of the coke water separator is connected to a sewage temporary storage tank, and the sewage temporary storage tank is connected to a dewatering tank through a slurry pump.

The discharge outlet of the coke tower is connected with a crusher, and the outlet of the crusher is connected with a coke water separator. Or the discharge port of the coke tower is connected to the upper part of the coke water separator, the tail end of the horizontal conveying mechanism of the coke water separator is provided with a crushing device, and the outlet end of the crushing device is connected to the coke conveyor.

The horizontal conveying mechanism comprises a conveying chain and a sieve plate arranged at the lower part of the conveying chain, and sieve holes through which water passes are formed in the sieve plate.

The screen plate consists of a horizontal part at the front end and a lifting part at the rear end.

At least one impact plate is arranged in the coke water separator, and the impact plate is obliquely arranged above the horizontal conveying mechanism and opposite to the inlet of the coke water separator.

The impact-resistant plate is provided with an upper surface with a zigzag structure.

The upper part of the machine body of the coke water separator is provided with an overflow port connected to the sewage temporary storage tank, and a filter screen is arranged at the overflow port.

And the tail gas absorption treatment system is used for treating harmful gases and is connected with a closed part in the equipment through a gas pipeline.

Two slurry pumps connected in parallel are arranged on the connecting pipeline between the sewage temporary storage tank and the dewatering tank.

The beneficial effects of the application are as follows: the coke-water separator separates water and small-particle coke through sieve holes on the horizontal conveying mechanism, so that dehydration of large-particle coke is realized, and the small-particle coke and water are sent into a dehydration tank for dehydration. The method of centralized dehydration of the coke is changed into a step-by-step treatment method of separately dehydrating the granular coke with different sizes, the treatment speed is faster, the efficiency is higher, the amount of the coke which needs to be treated by single equipment components such as a dehydration tank is greatly reduced, and the optimization control of the process is facilitated. The step-by-step treatment mode has lower requirements on equipment size, field area, layout and the like, and has low equipment cost, low construction cost and easy process implementation. The horizontal conveying mechanism is suspended above the inner bottom surface of the machine body, coke is completely dropped on the horizontal conveying mechanism and can be directly driven to be conveyed by the horizontal conveying mechanism, and the accumulation phenomenon caused by poor coke fluidity is avoided.

The method ensures that the whole process of cutting, conveying, dehydrating and storing the petroleum coke is carried out in a closed environment, no gas escapes, and the whole process can realize automatic control, is simple to operate and is beneficial to the stable operation of the system. Meanwhile, when the coke or water quantity discharged from the coke tower instantaneously is too large, overflow can be effectively prevented through the superposition buffer function of the volumes of all the parts, and the continuous operation of the petroleum coke closed conveying system is ensured.

Drawings

Fig. 1 is a schematic diagram of embodiment 1 of the present application.

Fig. 2 is a schematic diagram of embodiment 2 of the present application.

FIG. 3 is a schematic diagram of the coke water separator of the present application.

The marks in the figure: 1. the coke drum, 2, the crusher, 3, the coke water separator, 3-1, the organism, 3-2, horizontal conveying mechanism, 3-2-1, the conveying chain, 3-2-2, the sieve, 3-3, the overflow mouth, 3-4, the wash-proof board, 3-5, the delivery port, 3-6, the breaker, 4, the coke conveyor, 5, the slurry pump, 6, the sewage temporary storage tank, 7, the dehydration tank, 8, the water purification temporary storage tank, 9, the coke cutting water lifting pump, 10, the coke cutting water tank, 11, the coke cutting water pump, 12, the coke storage tank, 13, tail gas absorption treatment system.

Detailed Description

Embodiments of the present application will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1 and 2, the petroleum coke conveying, dewatering and storing device for delayed coking mainly comprises a coke-water separator 3, a dewatering tank 7, a coke storage tank 12, a clean water temporary storage tank 8 and other components. The coke water separator 3 is used for receiving a coke water mixture discharged from the coke tower 1, and the coke water mixture mixed with small-particle coke discharged from the coke water separator 3 is sent into the dehydration tank 7, and the dehydration tank 7 dehydrates the coke. The coke outlet and the recovered water outlet of the dehydration tank 7 are respectively connected (including direct connection and indirect connection) to a coke storage tank 12 and a clean water temporary storage tank 8, the coke storage tank 12 being used for storing dehydrated coke, and the clean water temporary storage tank 8 being used for storing water recovered in the dehydration process.

Unlike the centralized treatment mode in the prior art, the application adopts distributed treatment and only sends small-particle coke and water into a dehydration tank for dehydration. The large-sized coke is directly separated from water by a coke water separator. As shown in fig. 1-3, the coke water separator 3 of the application is provided with a machine body 3-1 which is horizontally arranged, the machine body 3-1 is of a rectangular structure, the machine body is totally closed, and the coke water mixture has temporary storage and flow fluctuation buffering effects. A horizontal conveying mechanism 3-2 suspended above the inner bottom surface of the machine body 3-1 is arranged in the machine body, and the horizontal conveying mechanism 3-2 is provided with sieve holes for water to pass through. The coke water mixture output by the coke tower enters the coke water separator and falls on the horizontal conveying mechanism 3-2, and water and small-particle coke are separated through sieve holes of the horizontal conveying mechanism, so that part of coke is dehydrated in the coke water separator 3. The separated water and small-particle coke are connected with a dehydration tank 7 through a sewage temporary storage tank 6 and a slurry pump 5 from a water outlet 3-5 arranged at the lower part of a coke-water separator body 3-1. The large coke is left above the horizontal conveying mechanism 3-2 after being separated from water, and is directly output from the horizontal conveying mechanism 3-2 to a coke-water separator and conveyed to a coke storage tank through a closed coke conveyor 4.

The horizontal conveying mechanism 3-2 comprises a conveying chain 3-2-1 and a sieve plate 3-2-2 arranged at the lower part of the conveying chain 3-2-1. The screen plate 3-2-2 is horizontally paved above the bottom of the machine body 3-1, and separates the bottom space of the machine body 3-1 from the coke inlet at the upper part, so that coke is prevented from accumulating at the bottom of the machine body. The conveying chain 3-2-1 can stably move under the action of power, and large-particle coke can be sent out of the coke-water separator 3 in the moving process, so that the coke-water separation is realized; the screen plate 3-2-2 is provided with a screen hole for water to pass through, and can allow water and small coke to pass through, so as to separate large coke and water. The diameter of the sieve holes can be selected to be 8-20 mm, so that the coke dehydration effect above the sieve plate is ensured, and the amount of coke required to be sent to a dehydration tank for treatment is reduced.

The fixed sieve plate 3-2-2 is matched with the moving conveying chain 3-2-1, and the scraping plate of the conveying chain 3-2-1 can turn the coke in the process of pushing the coke on the sieve plate 3-2, so that the water in the coke is separated, and the water flows to the lower part of the machine body 3-1 through the sieve holes 3-2-2 on the sieve plate, and the dehydration process of the coke is accelerated. In order to avoid that the excessive water in the machine body 3-1 submerges the sieve plate and is unfavorable for dehydration. As shown in fig. 3, the screen plate is lifted slightly upward at the end of the conveying direction, and the screen plate 3-2-2 is composed of a horizontal portion at the front end and a lifting portion at the rear end. The lifting part at the rear end can leak out of the water surface under the condition of excessive water in the machine body; on the other hand, the coke is scraped upwards and conveyed in the part, which is more beneficial to overturning the coke in the conveying process and enhances the dewatering effect. The overflow port 3-3 is arranged on the coke-water separator, the overflow port 3-3 is provided with a filter screen, and when the coke or water discharged from the coke tower instantaneously is too large, small-particle coke and water can overflow from the overflow port 3-3 of the coke-water separator. The sewage temporary storage tank 6 can be of a rectangular or cylindrical structure, the top is closed, the focusing water mixture has the buffer effect of temporary storage and flow fluctuation, and two slurry pumps 5 are needed, namely one working pump and one standby pump. The dehydration tank 7 may be circular or rectangular, and two or more may be provided.

The present application provides two methods of treating the coke exiting the coke drum 1 after the coking reaction is completed. As shown in fig. 1, a crusher 2 is connected to the discharge port of the coke drum 1, and the outlet of the crusher 2 is connected to a coke water separator 3. The mixture of coke and water discharged from the coke drum 1 after cooling and cutting is crushed by the crusher 2 to an appropriate particle size (150 mm) and discharged into the coke-water separator 3 together with water. Most of the coke is conveyed out under the action of the conveying chain 3-2-1, and meanwhile, the separation of the coke from the water is realized. The dewatered coke is then fed into a coke storage drum 12 by a closed coke conveyor 4. The small-particle coke and water which are not conveyed out by the conveying chain 3-2-1 in the coke-water separator body 3-1 are discharged into the sewage temporary storage tank 6 through the water outlet 3-5, and then are conveyed into the dewatering bin 7 through the slurry pump 5, wherein two slurry pumps 5 are needed, one working and one standby. (in special cases, when the coke or water discharged from the coke tower instantaneously is too large, the conveying chain 3-2-1 conveys the coke and the water outlet 3-5 of the coke-water separator to discharge water untimely, and small-particle coke and water can also be discharged into the sewage temporary storage tank 6 from the overflow port 3-3 at the upper part of the coke-water separator body 3-1). The mixture of the small-particle coke and the water is dehydrated in the dehydration tank 7 for about 6-12 hours, and the dehydration tank 7 can be provided with two or more dehydration tanks, so that the dehydration operation and the equipment installation are convenient. After the small-particle coke is dehydrated, it is discharged into a closed coke conveyor 4 and fed into a coke storage tank 12 together with the large-particle coke. And then loading and transporting the materials outside at regular intervals. The removed water is discharged into a clean water temporary storage tank 8, then clean water is sent into a coke cutting water tank 10 for temporary storage by a coke cutting water lifting pump 9, and when the next coke cutting process begins, the clean water is sent into a coke tower by a coke cutting water pump 11 for coke cutting.

Alternatively, as shown in fig. 2, the discharge port of the coke drum 1 is connected to the upper side of the coke-water separator 3, a crushing device 3-6 is provided at the end of the horizontal conveying mechanism 3-2 of the coke-water separator 3, and the outlet end of the crushing device 3-6 is connected to the coke conveyor 4. The crushing device 3-6 may be a crushing roller arranged at the end of the horizontal conveyor 3-2 or other crushing element. This embodiment integrates the coke water separator 3 with the crushing devices 3-6 to form one apparatus. Compared with the mode of independently arranging the crusher, the cost of equipment is reduced, and the occupied area required by the equipment is also reduced. In this way, at least one impact plate 3-4 may be provided in the water separator 3, the impact plate 3-4 being disposed obliquely above the horizontal conveyance mechanism 3-2 and opposite to the inlet of the water separator 3. The mixture of coke and water discharged from the coke drum 1 after cooling and cutting is directly discharged into the coke water separator 3. When the large-block coke falls onto the impact plate 3-4 in the coke water separator, the impact plate 3-4 performs preliminary impact crushing on the large-block coke, and then falls onto the horizontal conveying mechanism 3-2. The impact plate 3-4 can protect the horizontal conveying mechanism 3-2 from impact and plays a role in preliminary crushing of coke, so that the horizontal conveying mechanism is prevented from being blocked due to overlarge coke blocks. The impingement plate 3-4 has an upper surface with a zigzag structure that promotes its cracking by sharp corners striking the coke. Compared with the mode of crushing by using a crusher in the embodiment shown in fig. 1, the impact plate 3-4 only breaks the oversized coke by impact, and the quantity of generated fine coke particles is far smaller than that of the mode of crushing by using the crusher, so that most of the coke falling on the horizontal conveying mechanism 3-2 is large-sized coke, and is separated from water by screening the screen plate 3-2-2 on the horizontal conveying mechanism 3-2, and then most of the coke is conveyed out under the action of the conveying chain 3-2-1, and meanwhile, the separation of coke and water is realized. The dewatered coke is then fed into a coke storage drum 12 by a closed coke conveyor 4. Because the amount of fine coke particles generated after the impact plate 3-4 breaks the coke is small, only a small amount of fine coke particles are separated from water through the sieve holes of the horizontal conveying mechanism 3-2, discharged into the sewage temporary storage tank 6 through the water outlet 3-5 of the coke-water separator, and then sent into the dehydration tank 7 through the slurry pump 5. The amount of the coke water mixture to be treated by the dewatering tank 7 is smaller, and the treatment efficiency of the whole equipment is higher. The slurry pump 5 of the embodiment shown in fig. 2 is also preferably provided with two pumps, one for operation and one for standby. (in the special case, too, when the coke or water discharged from the coke tower instantaneously is too large, the conveying chain 3-2-1 conveys the coke and the water outlet 3-5 of the coke-water separator to be discharged timely, small-particle coke and water can be discharged into the sewage temporary storage tank 6 from the overflow port 3-3 of the coke-water separator, and a filter screen can be arranged at the overflow port 3-3 to prevent larger coke above the horizontal conveying mechanism from being discharged from the overflow port). The mixture of the small-particle coke and the water is dehydrated in the dehydration tank 7 for about 6-12 hours, and the dehydration tank 7 can be provided with two or more dehydration tanks, so that the dehydration operation and the equipment installation are convenient. After the small-particle coke is dehydrated, it is discharged into a closed coke conveyor 4 and fed into a coke storage tank 12 together with the large-particle coke. And then loading and transporting the materials outside at regular intervals. The removed water is discharged into a clean water temporary storage tank 8, then clean water is sent into a coke cutting water tank 10 for temporary storage by a coke cutting water lifting pump 9, and when the next coke cutting process begins, the clean water is sent into a coke tower by a coke cutting water pump 11 for coke cutting.

Gas exhaust pipelines are arranged at the sealing parts of the coke tower 1, the coke-water separator 3, the dewatering tank 7, the sewage temporary storage tank 6, the clean water temporary storage tank 8, the coke cutting water tank 10, the coke storage tank 12 and other devices, and can send harmful gases emitted from the devices to the tail gas absorption treatment system 13. After the harmful gas is purified, the harmful gas can be sent to a safety place for evacuation. The process method can lead the petroleum coke to be carried out in a closed environment in the whole process of decoking, conveying, dehydrating and storing, and no gas escapes.

Claims

1. A petroleum coke conveying, dewatering and storing device for delayed coking comprises a coke water separator (3) for receiving a coke water mixture discharged from a coke tower (1), a coke conveyor (4), a dewatering tank (7) for dewatering coke, a coke storage tank (12) for storing coke and a clean water temporary storage tank (8) for storing reclaimed water; the coke outlet and the reclaimed water outlet of the dehydration tank (7) are respectively connected to a coke storage tank (12) and a purified water temporary storage tank (8), and the device is characterized in that: the coke-water separator (3) is provided with a horizontally arranged machine body (3-1), a horizontal conveying mechanism (3-2) suspended above the inner bottom surface of the machine body (3-1) is arranged in the machine body, sieve holes through which water passes are formed in the horizontal conveying mechanism (3-2), water and small-particle coke can be separated through the sieve holes, the tail end of the horizontal conveying mechanism (3-2) is connected to a coke storage tank (12) through a coke conveyor (4) and used for conveying large-sized coke to the coke storage tank (12), a water outlet (3-5) is formed in the lower portion of the coke-water separator machine body (3-1), and a coke water mixture mixed with the small-particle coke and output by the water outlet (3-5) is directly or transitionally conveyed to a dewatering tank (7).

2. A delayed coking petroleum coke transporting, dewatering and storing apparatus as claimed in claim 1, wherein: the water outlet (3-5) of the coke water separator (3) is connected to a sewage temporary storage tank (6), and the sewage temporary storage tank (6) is connected to a dewatering tank (7) through a slurry pump (5).

3. A delayed coking petroleum coke transporting, dewatering and storing apparatus as claimed in claim 1, wherein: the discharge outlet of the coke tower (1) is connected with a crusher (2), and the outlet of the crusher (2) is connected with a coke water separator (3).

4. A delayed coking petroleum coke transporting, dewatering and storing apparatus as claimed in claim 1, wherein: the discharge port of the coke tower (1) is connected to the upper part of the coke-water separator (3), a crushing device (3-6) is arranged at the tail end of a horizontal conveying mechanism (3-2) of the coke-water separator (3), and the outlet end of the crushing device (3-6) is connected to the coke conveyor (4).

5. A petroleum coke conveying, dewatering and storage apparatus for delayed coking according to any of claims 1 to 4, wherein: the horizontal conveying mechanism (3-2) comprises a conveying chain (3-2-1) and a screen plate (3-2-2) arranged at the lower part of the conveying chain (3-2-1), and screen holes through which water passes are formed in the screen plate (3-2-2).

6. A delayed coking petroleum coke conveying, dewatering and storage apparatus as claimed in claim 5, wherein: the screen plate (3-2-2) consists of a horizontal part at the front end and a lifting part at the rear end.

7. A delayed coking petroleum coke transporting, dewatering and storing apparatus as recited in claim 4, wherein: at least one impact plate (3-4) is arranged in the coke water separator (3), and the impact plate (3-4) is obliquely arranged above the horizontal conveying mechanism (3-2) and opposite to the inlet of the coke water separator (3).

8. A delayed coking petroleum coke transporting, dewatering and storing apparatus as recited in claim 7, wherein: the impact-resistant plate (3-4) is provided with an upper surface with a zigzag structure.

9. A petroleum coke conveying, dewatering and storage apparatus for delayed coking according to any of claims 1 to 4, wherein: an overflow port (3-3) connected to the sewage temporary storage tank (6) is arranged at the upper part of the machine body (3-1) of the coke water separator (3), and a filter screen is arranged at the overflow port (3-3).

10. A petroleum coke conveying, dewatering and storage apparatus for delayed coking according to any of claims 1 to 4, wherein: an exhaust gas absorption treatment system (13) for treating harmful gases is also provided, which is connected with the closed part of the equipment through a gas pipeline.