CN220003441U - Decoking gas purification device and decoking gas purification system - Google Patents

Abstract

The utility model discloses a decoking gas purifying device and a decoking gas purifying system, comprising a shell, wherein a gas distributor, first-stage absorption purifying equipment and second-stage absorption purifying equipment are sequentially arranged in the shell from bottom to top, a gas inlet communicated with the gas distributor and liquid seal particle recovery openings are arranged on the bottom of the shell, the gas distributor is used for uniformly distributing pressurized decoking gas entering through the gas inlet, the first-stage absorption purifying equipment is used for primarily separating and purifying the decoking gas, the second-stage absorption purifying equipment is arranged on the shell through a supporting plate, so that a closed space is formed between the supporting plate and the liquid seal particle recovery openings, the decoking gas primarily separated and purified through the first-stage absorption purifying equipment enters the second-stage absorption purifying equipment, and the second-stage absorption purifying equipment is used for secondarily separating and purifying the decoking gas and discharging the obtained clean gas from the space above the supporting plate. Can treat fine particles in the decoking gas and has better dust removal effect.

Description

Decoking gas purification device and decoking gas purification system

Technical Field

The utility model relates to a decoking gas purifying device, in particular to a decoking gas purifying device. In addition, the utility model also relates to a decoking gas purification system.

Background

With the increasing environmental protection requirements of the country and the society, the requirements on the exhaust gas discharged to the atmosphere in the petrochemical industry are more and more strict. Ethylene is one of the most important basic raw materials in petrochemical industry, and the main process for producing ethylene is that hydrocarbon raw materials are cracked at high temperature in a cracking furnace of an ethylene device, and generated cracked gas is quenched by a quenching system and then conveyed to a downstream processing system through a pipeline. During the high-temperature pyrolysis of hydrocarbon in the running period of the pyrolysis furnace, catalytic coking, free radical coking and polycondensation coking can occur on the inner surface of a furnace tube in a radiation section of the pyrolysis furnace, secondary reaction coking and coke generated by condensation coking can occur on the inner surface of a quenching system, and coke particles are formed after the coke is removed, and the coke particles enter a separation quenching system along with pyrolysis gas, so that a large pyrolysis gas valve and a decoking valve arranged on a pipeline are blocked, and even a quenching oil circulation system filter is blocked. Therefore, the petrochemical industry needs to treat coke particles generated in the furnace tube and the pyrolysis gas pipeline by an air burning method at regular intervals so as to remove coke powder accumulated in the furnace tube. The decoking gas generated by the decoking treatment comprises carbon oxides, water vapor, residual coke particles and the like, and the decoking gas is directly discharged to the atmosphere, so that environmental pollution is caused, and further treatment is needed.

The existing decoking treatment method generally needs to separate a mixture formed by a large amount of decoking gas and steam generated in the decoking process through a decoking tank system so as to meet the environmental protection emission requirement. For example, patent document CN113701172a discloses a coke cleaning system for an ethylene cracking furnace, which adopts a dry cyclone separation technology, and the dry cyclone separation technology is only suitable for treating large-particle-size particles, and cannot remove fine particles in flue gas, so that the dust removal effect is insufficient.

Disclosure of Invention

The utility model aims to solve the technical problem of providing the decoking gas purifying device which can treat fine particles in decoking gas and has a good dust removing effect.

The utility model also solves the technical problem of providing a decoking gas purification system which can treat fine particles in decoking gas and has a better dust removal effect.

In order to solve the technical problems, according to one aspect of the present utility model, there is provided a decoking gas purifying apparatus, including a housing, in which a gas distributor, a first stage absorption purifying device and a second stage absorption purifying device are sequentially disposed from bottom to top, the housing is provided with a gas inlet communicating with the gas distributor and a liquid-sealed particle recovery port located at the bottom of the housing, the gas distributor is configured to uniformly distribute pressurized decoking gas entering through the gas inlet, the first stage absorption purifying device is configured to primarily separate and purify the decoking gas, the second stage absorption purifying device is mounted on the housing through a support plate, so that a gas-sealed space is formed between the support plate and the liquid-sealed particle recovery port, and the decoking gas primarily separated and purified by the first stage absorption purifying device enters the second stage absorption purifying device, and the second stage absorption purifying device is configured to secondarily separate and purify the decoking gas and discharge the gas obtained by the secondary separation from a space above the support plate.

In some embodiments, the first stage absorption clean up device is a baffled separator.

In some embodiments, the second stage absorption and purification device comprises a jet grouting separator, the jet grouting separator comprises a jet grouting absorption cylinder, a jet grouting absorption exhaust port extending above the supporting plate is arranged at the top of the jet grouting absorption cylinder, a jet grouting absorption recovery port is arranged at the bottom of the jet grouting absorption cylinder, and a tangential inlet for guiding the decoking gas to enter the jet grouting separator in a tangential direction is arranged on the side wall of the jet grouting absorption cylinder, so that the decoking gas and an absorbent entering by jet flow collide and absorb.

In some embodiments, the side wall of the rotary jetting absorber cylinder is provided with a plurality of through holes for the absorber jet to enter.

In some embodiments, each through hole is uniformly distributed around the side wall of the rotary spraying absorption cylinder body from top to bottom.

In some embodiments, the operational pressure drop of the jet separator is from 3 to 10KPa.

In some embodiments, the number of the jet-spinning separators is plural, and each of the jet-spinning separators is connected in series.

In some embodiments, the spin-spray absorption recovery port of the spin-spray separator located at the bottommost portion extends below the liquid level of the bottom of the housing.

In some embodiments, the top of the housing is provided with an exhaust port in communication with the space above the support plate.

In another aspect, the utility model provides a decoking gas purification system, which comprises a decoking tank and the decoking gas purification device in any one of the technical schemes, wherein the decoking tank is connected with the particle recovery port.

Through the technical scheme, the utility model has the following beneficial effects:

the utility model uses the gas distributor to uniformly distribute the decoking gas to prevent the local gas flow velocity from being too large, then makes the uniformly distributed decoking gas perform primary gas-solid separation through the first-stage absorption and purification equipment, and then performs secondary gas-solid separation through the second-stage absorption and purification equipment, thereby being capable of treating fine particles in the decoking gas and having better dust removal effect.

Additional features and advantages of the utility model will be set forth in the detailed description which follows.

Drawings

FIG. 1 is a schematic view of a decoking gas cleaning plant in an embodiment of the utility model;

FIG. 2 is a schematic diagram of a decoking gas purification system in an embodiment of the utility model;

FIG. 3 is a schematic diagram of a jet cyclone in an embodiment of the present utility model;

fig. 4 is a schematic diagram of the working principle of a jet-spinning separator in an embodiment of the utility model.

Description of the reference numerals

1 housing 10 decoking pond

2-cyclone jet separator

3 backup pad 21 spouts absorption barrel soon

4 baffling separator 22 rotary spraying absorption exhaust port

5 gas distributor 23 rotary spraying absorption recovery port

6 air inlet 24 tangential inlet

7 granule recovery mouth

8 exhaust ports

9 air pump

Detailed Description

Embodiments of the present utility model are described in further detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the utility model and are not intended to limit the scope of the utility model, which may be embodied in many different forms and not limited to the specific embodiments disclosed herein, but rather to include all technical solutions falling within the scope of the claims.

These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values set forth in these embodiments should be construed as exemplary only and not limiting unless otherwise specifically stated.

In the description of the present utility model, unless otherwise indicated, the meaning of "plurality of" means greater than or equal to two; the orientation or positional relationship indicated is merely for convenience in describing the utility model and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the utility model. When the absolute position of the object to be described is changed, the relative positional relationship may be changed accordingly.

It should also be noted that, in the description of the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "configured" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present utility model can be understood as appropriate by those of ordinary skill in the art. When a particular device is described as being located between a first device and a second device, there may or may not be an intervening device between the particular device and either the first device or the second device.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, and thus, features defining "first," "second," or the like, may explicitly or implicitly include one or more of such features.

All terms used herein have the same meaning as understood by one of ordinary skill in the art to which the present utility model pertains, unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods, and apparatus should be considered part of the specification.

As shown in fig. 1 and 2, a basic embodiment of the present utility model provides a decoking gas purifying apparatus, including a housing 1, a gas distributor 5, a first stage absorption purifying device and a second stage absorption purifying device are disposed in the housing 1, the gas distributor 5, the first stage absorption purifying device and the second stage absorption purifying device are sequentially disposed from bottom to top, an air inlet 6 and a particle recovery port 7 are disposed on the housing 1, the air inlet 6 is in communication with the gas distributor 5, the particle recovery port 7 is located at the bottom of the housing 1, and the particle recovery port 7 is in a liquid-sealed state, the gas distributor 5 is configured to uniformly distribute pressurized decoking gas entering through the air inlet 6, the first stage absorption purifying device is configured to perform primary separation purification on the decoking gas, the second stage absorption purifying device is mounted on the housing 1 through a support plate 3, and a gas-sealed space is formed between the support plate 3 and the liquid-sealed particle recovery port 7, so that the second stage absorption purifying device can perform secondary separation on the decoking gas, and the secondary separation purifying gas is discharged from the support plate 3.

Based on the above technical scheme, the gas distributor 5 can uniformly distribute the pressurized decoking gas entering through the gas inlet 6, so as to prevent the phenomenon of overlarge local gas flow rate. The decoking gas after the equipartition flows upwards, carries out preliminary separation purification through first level absorption clarification plant, because decoking gas is in evenly distributed state, consequently, can obtain the preliminary dust removal effect of relatively better, further carries out secondary separation purification through second level absorption clarification plant again, consequently, can handle fine particle in the decoking gas, has better dust removal effect and dust removal efficiency.

In the specific embodiment, the first stage absorption and purification device is a baffling separator 4, the baffling separator 4 comprises a plurality of layers of corrugated baffles which are arranged from bottom to top, the corrugated baffles with the lipophilic lower surface and the hydrophilic upper surface are adopted, in the use process, oil drops are collected at the peak points of the corrugated baffles and rise to an oil layer, the water drops are collected at the concave parts of the corrugated baffles to be coalesced and grow up and sink down quickly, and because the corrugated baffles are gradually reduced and laminated at the peak sections of the corrugated baffles, the oil drops and the water drops do variable-speed movement along the corrugated baffles, so that the collision probability of the water drops is increased, and the water drops can be coalesced and grow. Then oil floats up to the upper corrugated baffle plate layer by small holes with certain ratio of wave crest and wave trough, so that the oil can float up or descend layer by layer. The corrugated baffle plate is made of organic polymer materials such as surface modified reinforced PP (polypropylene), TEFLON (polytetrafluoroethylene), 316L (stainless steel) and the like, has good oleophilic hydrophobicity or hydrophile oleophobic property, acid-base resistance and high temperature resistance after special surface treatment, and has good mechanical strength and service life. Wherein the purifying effect of the baffling separator 4 can be more than 80%, and the operating pressure drop of the baffling separator 4 is 1-2 KPa.

As a specific structural form of the second-stage absorption and purification apparatus, the second-stage absorption and purification apparatus includes a spin-spray separator 2, fig. 3 shows a specific embodiment of the spin-spray separator 2, the spin-spray separator 2 includes a spin-spray absorption cylinder 21, a top portion of the spin-spray absorption cylinder 2 is provided with a spin-spray absorption exhaust port 22 extending above the support plate 3, a bottom portion of the spin-spray absorption cylinder 2 is provided with a spin-spray absorption recovery port 23, a tangential inlet 24 is provided on a sidewall of the spin-spray absorption cylinder 2, and the tangential inlet 24 guides decoking gas into the interior of the spin-spray separator 2 in a tangential direction.

As a specific example of the arrangement of the jet-spinning separators 2, the number of the jet-spinning separators 2 is plural, and each jet-spinning separator 2 is connected in series. When the jet-grouting separator 2 is used in series with multiple stages, the number of stages can be 2-4. The single-stage purifying effect of the cyclone separator 2 on the solid particles is more than 99 percent, and the single-stage operation pressure drop of the cyclone separator 2 is 3 to 10KPa.

In a specific embodiment, liquid is poured into the bottom of the shell 1 to realize liquid sealing of the particle recovery port 7, and further, the rotary spraying absorption recovery port 23 at the bottommost part of the rotary spraying separator 2 extends below the liquid level, so that liquid sealing of the rotary spraying absorption recovery port 23 at the bottommost part of the rotary spraying separator 2 is realized. Wherein the liquid poured at the bottom of the housing 1 may be water.

The cyclone separator 2 can be of different diameters, different sizes and different numbers to meet the treatment requirements of different flow rates.

In a specific embodiment, the top of the housing 1 is provided with an exhaust port 8, the exhaust port 8 being in communication with the space above the support plate 3.

Further, as shown in fig. 3, the side wall of the spin-spray absorption cylinder 21 is provided with a plurality of through holes, each through hole being used for the entry of an absorbent jet.

In some embodiments, the individual through holes are layered around the sidewall of the spin-spray absorber cylinder 21 from top to bottom.

The absorbent can be industrial water, which refers to the general term of production water and factory staff life water used in the industrial production process. As shown in fig. 2, the industrial water is pressurized by a hydraulic pump, and the pressurized industrial water enters the spin-spray absorption cylinder 21 through a plurality of through-hole jets on the side wall of the spin-spray absorption cylinder 21. In addition, referring to fig. 4, the tangential inlet 24 guides the decoking gas (the solid line and the circle entering through the tangential inlet 24 in fig. 4 illustrate the decoking gas) to enter the inside of the cyclone separator 2 along the tangential direction, a gas-phase turbulent flow field (the annular dotted line illustrate the gas-phase turbulent flow field in fig. 4) is formed inside the cyclone separator 2, meanwhile, the absorbent enters the cyclone absorption cylinder 21 through a plurality of through hole jet flows on the side wall of the cyclone absorption cylinder 21, the gas-phase turbulent flow field breaks the liquid-phase high-speed jet flow to enable the absorbent to form micro-droplets in the cyclone absorption cylinder 21, the micro-droplets are further subjected to cladding iterative motion under the action of the shearing force of the gas-phase turbulent flow field, and fine particles in the decoking gas can be removed in a large amount in the motion process, and the particle size of the fine particles is more than 0.1 μm.

As shown in fig. 2, the utility model also provides a decoking gas purifying system, the particle recovery port 7 of the decoking gas purifying device is connected with the decoking tank 10, the water-solid mixture containing solid particles collected at the bottom of the shell 1 is discharged from the particle recovery port 7 and then enters the decoking tank 10 to be precipitated, the precipitated filtered water is discharged from the decoking tank 10 and can be taken as an absorbent to enter the rotary spraying absorption cylinder 21 from a plurality of through hole jet flows on the side wall of the rotary spraying absorption cylinder 21 again, and the recycling is realized. Wherein, because granule recovery mouth 7 links to each other with the decoking pond 10, the liquid in the pipeline that casing 1 bottom and granule recovery mouth 7 link to each other can realize the liquid seal to granule recovery mouth 7.

In order to better understand the technical idea of the present utility model, the following description is made in connection with relatively comprehensive technical features.

As shown in fig. 2, the preferred embodiment of the utility model provides a decoking gas purification system, which comprises a decoking gas purification device and a decoking tank 10, wherein the decoking gas purification device comprises a shell 1, a gas distributor 5, a first-stage absorption purification device and a second-stage absorption purification device are arranged in the shell 1, the gas distributor 5, the first-stage absorption purification device and the second-stage absorption purification device are sequentially arranged from bottom to top, a gas inlet 6 and a particle recovery port 7 are arranged on the shell 1, the gas inlet 6 is communicated with the gas distributor 5, the particle recovery port 7 is positioned at the bottom of the shell 1, the particle recovery port 7 is connected with the decoking tank 10 through a pipeline, liquid sealing of the particle recovery port 7 is realized, and a gas outlet 8 is arranged at the top of the shell 1. The first-stage absorption and purification equipment can be a baffling separator 4, the second-stage absorption and purification equipment comprises a rotary spraying separator 2, the rotary spraying separator 2 comprises a rotary spraying absorption cylinder 21, a rotary spraying absorption exhaust port 22 extending out of the upper part of the supporting plate 3 is arranged at the top of the rotary spraying absorption cylinder 2, a rotary spraying absorption closing-in port 23 is arranged at the bottom of the rotary spraying absorption cylinder 2, the rotary spraying absorption closing-in port 23 is connected with a liquid sealing device 11, a tangential inlet 24 is arranged on the side wall of the rotary spraying absorption cylinder 2, decoking gas pressurized by an air pump enters the rotary spraying absorption cylinder 21 from the tangential inlet 24 along the tangential direction, and all through holes on the side wall of the rotary spraying absorption cylinder 21 are formed.

The purification process for the decoking gas is as follows:

the decoking gas enters from the gas inlet 6 and is uniformly distributed in the decoking gas purifying device through the gas distributor 5 so as to prevent the phenomenon of overlarge local gas flow velocity, the uniformly distributed decoking gas flows upwards to reach the baffling separator 4 to obtain primary gas-solid separation, large-particle-size particles in the decoking gas are mainly removed, the particle size of the large-particle-size particles is generally larger than 100 mu m, and the separated coke powder particles fall to the bottom of the decoking gas purifying device and enter the decoking tank 10 through the particle recovery port 7. Because the rotary spraying absorption recovery port 23 and the particle recovery port 7 are both sealed, decoking gas can only enter the rotary spraying separator 2 along the tangential direction through the tangential inlet 24, a gas-phase turbulent flow field is formed in the rotary spraying separator 2, meanwhile, the absorbent enters the rotary spraying absorption cylinder 21 through a plurality of through hole jet flows on the side wall of the rotary spraying absorption cylinder 21, the gas-phase turbulent flow field breaks through the liquid-phase high-speed jet flow to enable the absorbent to form micro liquid drops in the rotary spraying absorption cylinder 21, the micro liquid drops are further subjected to cladding iterative motion under the action of the shearing force of the gas-phase turbulent flow field, and fine particles in the decoking gas can be adsorbed and removed in a large quantity in the motion process, and the particle size of the fine particles is larger than 0.1 mu m. The secondarily purified gas is discharged from the upper part of the rotary jet separator 2, reaches the top of the shell 1, is discharged from the exhaust port 8, and can enter the next working condition. The water phase containing solid particles obtained by secondary purification enters a decoking pond 10 through a particle recovery port 7, and is subjected to coke powder filtration recovery and industrial water filtration recovery through the decoking pond 10.

The decoking gas purifying system is mainly used for decoking gas generated in the ethylene production process, and the decoking gas purifying system can be used for other similar gas-solid separation process flows, and is not limited to purifying treatment of decoking gas generated in the ethylene production process.

The operation pressure drop of the decoking gas purifying device is 1-20 KPa, the treatment capacity can be 5000-250000 m < 3 >/h, the dust content of outlet gas is less than 20mg/m < 3 >, the whole equipment continuously runs for not less than 4 years, and the design life of the equipment exceeds 20 years. The treatment effect is good, the equipment diameter is small, and the total occupied area and the total investment cost of the device can be reduced.

Specifically, taking an ethylene decoking gas purification system of a certain enterprise as an example, the content of solid particles of the ethylene decoking gas is about 500mg/m3, the operating temperature is 1100 ℃, and the operating air quantity is 7 00Nm3/h. As shown in FIG. 2, the decoking gas purification device is adopted to carry out purification treatment for 24 hours, and the discharge amount of solid particles treated by the decoking gas purification device is about 20mg/m < 3 > or less, which accords with the integrated discharge standard of atmospheric pollutants (GB 16297-1996). The device runs continuously for not less than 5 years, and the design life is 20 years. Compared with other processes and devices, the process and the device of the utility model simplify the system, save the cost, reduce the energy consumption and generate great economic benefit.

The preferred embodiments of the present utility model have been described in detail above with reference to the accompanying drawings, but the present utility model is not limited thereto. Within the scope of the technical idea of the utility model, a number of simple variants of the technical solution of the utility model are possible, including combinations of individual specific technical features in any suitable way. The various possible combinations of the utility model are not described in detail in order to avoid unnecessary repetition. Such simple variations and combinations are likewise to be regarded as being within the scope of the present disclosure.

Claims (10)

1. The utility model provides a decoking gas purification device, its characterized in that includes casing (1), be equipped with gas distributor (5), first level absorption clarification plant and second level absorption clarification plant in proper order from bottom to top in casing (1), be provided with on casing (1) with gas distributor (5) intercommunication's air inlet (6) and be located liquid seal's of casing (1) bottom granule recovery mouth (7), gas distributor (5) are configured to can make through the pressurized decoking gas evenly distributed of air inlet (6) entering, first level absorption clarification plant is configured to can be right preliminary separation purification is carried out to the decoking gas, second level absorption clarification plant is installed through backup pad (3) on casing (1), so that backup pad (3) and liquid seal form the gas airtight space between granule recovery mouth (7), thereby make through first level absorption clarification plant preliminary separation purification's clear gas get into second level absorption clarification plant, second level absorption clarification plant is configured to can be right to the separation of gas is carried out from the separation purification plant and clear gas is obtained from the separation purification space on the backup pad (3).

2. Decoking gas cleaning plant according to claim 1, characterized in that said first stage absorption cleaning device is a baffled separator (4).

3. Decoking gas cleaning plant according to claim 1, characterized in that the second stage absorption cleaning device comprises a jet-grouting separator (2), the jet-grouting separator (2) comprising a jet-grouting absorption cylinder (21), the top of the jet-grouting absorption cylinder (21) being provided with a jet-grouting absorption exhaust port (22) extending above the support plate (3), the bottom of the jet-grouting absorption exhaust port being provided with a jet-grouting recovery port (23), and the side wall of the jet-grouting absorption cylinder being provided with a tangential inlet (24) for guiding the decoking gas tangentially into the jet-grouting separator (2) so as to enable the decoking gas to collide with the jet-entering absorbent for absorption.

4. A decoking gas cleaning plant according to claim 3, characterized in that the side wall of the spin-spray absorption cylinder (21) is provided with a number of through holes for the entry of the absorbent jet.

5. Decoking gas cleaning equipment according to claim 4, characterized in that each through hole is layered and distributed around the side wall of the spin-spray absorption cylinder (21) from top to bottom.

6. A decoking gas cleaning plant according to claim 3, characterized in that the operating pressure drop of the cyclone separator (2) is 3-10 KPa.

7. A decoking gas cleaning plant according to claim 3, characterized in that the number of said jet-spinning separators (2) is plural, each of said jet-spinning separators (2) being connected in series.

8. Decoking gas cleaning plant according to claim 7, characterized in that the spin-spray absorption recovery port (23) of the spin-spray separator (2) located at the bottommost extends below the liquid level at the bottom of the housing (1).

9. Decoking gas cleaning equipment according to any one of claims 3 to 8, characterized in that the top of the housing (1) is provided with an exhaust port (8) communicating with the space above the support plate (3).

10. A decoking gas cleaning system, characterized by comprising a decoking tank (10) and a decoking gas cleaning device according to any one of claims 1 to 9, said decoking tank (10) being connected to said particle recovery port.