CN115253921A - Circulation system for protecting high-temperature pipeline shock cooling washing solidification - Google Patents
Circulation system for protecting high-temperature pipeline shock cooling washing solidification Download PDFInfo
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- CN115253921A CN115253921A CN202210575282.2A CN202210575282A CN115253921A CN 115253921 A CN115253921 A CN 115253921A CN 202210575282 A CN202210575282 A CN 202210575282A CN 115253921 A CN115253921 A CN 115253921A
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- 238000005406 washing Methods 0.000 title claims abstract description 84
- 238000007711 solidification Methods 0.000 title claims abstract description 6
- 230000008023 solidification Effects 0.000 title claims abstract description 6
- 238000001816 cooling Methods 0.000 title abstract description 10
- 230000035939 shock Effects 0.000 title description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 108
- 239000012071 phase Substances 0.000 claims abstract description 28
- 239000007787 solid Substances 0.000 claims abstract description 26
- 238000011010 flushing procedure Methods 0.000 claims abstract description 22
- 239000007788 liquid Substances 0.000 claims abstract description 20
- 238000000926 separation method Methods 0.000 claims abstract description 17
- 239000007921 spray Substances 0.000 claims abstract description 14
- 239000007791 liquid phase Substances 0.000 claims abstract description 12
- 239000002002 slurry Substances 0.000 claims abstract description 7
- 238000010791 quenching Methods 0.000 claims abstract description 6
- 230000000171 quenching effect Effects 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims description 80
- 239000002245 particle Substances 0.000 claims description 39
- 239000007795 chemical reaction product Substances 0.000 claims description 33
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 21
- 239000000047 product Substances 0.000 claims description 19
- 238000005507 spraying Methods 0.000 claims description 13
- 239000000126 substance Substances 0.000 claims description 10
- 239000000498 cooling water Substances 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 238000004523 catalytic cracking Methods 0.000 claims description 7
- 238000005260 corrosion Methods 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 claims description 3
- 229930195733 hydrocarbon Natural products 0.000 claims description 3
- 150000002430 hydrocarbons Chemical class 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 239000008346 aqueous phase Substances 0.000 claims 2
- 238000002347 injection Methods 0.000 claims 1
- 239000007924 injection Substances 0.000 claims 1
- 238000004140 cleaning Methods 0.000 abstract description 2
- 239000013049 sediment Substances 0.000 abstract description 2
- 239000003054 catalyst Substances 0.000 description 30
- 238000000034 method Methods 0.000 description 20
- 230000008569 process Effects 0.000 description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 238000010926 purge Methods 0.000 description 6
- 239000004215 Carbon black (E152) Substances 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 4
- 238000011069 regeneration method Methods 0.000 description 4
- 239000008237 rinsing water Substances 0.000 description 4
- 150000001336 alkenes Chemical class 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000009991 scouring Methods 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 238000011143 downstream manufacturing Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
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- 239000012495 reaction gas Substances 0.000 description 1
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- 239000010865 sewage Substances 0.000 description 1
- 239000011949 solid catalyst Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/005—Separating solid material from the gas/liquid stream
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
- B01J8/24—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D1/00—Devices using naturally cold air or cold water
- F25D1/02—Devices using naturally cold air or cold water using naturally cold water, e.g. household tap water
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Cleaning In General (AREA)
Abstract
The invention provides a circulating system for protecting high-temperature pipeline quenching washing solidification, which comprises: the high-temperature pipeline comprises a vertical pipeline and an inclined pipeline connected through an arc bent pipe; a washing device; is provided with a product gas inlet, a product gas outlet, a washing water outlet and a washing water replenishing port; a solid-liquid separation device provided with a liquid inlet, a slurry outlet and a liquid phase outlet which are communicated with the washing water outlet; a deoxidizer unit; an inlet communicated with the liquid phase outlet, a water phase outlet and a gas phase outlet containing oxides are arranged; wherein, the arc elbow is provided with a washing nozzle which sprays water to the inside of the arc elbow, and the inner wall of the inclined pipeline is provided with a fan-shaped nozzle. The circulating system provided by the invention pressurizes the self-produced water introduced into the system through the arrangement of the high-temperature pipeline and the accessories, and the self-produced water is divided into a cooling part and a flushing part and then is sent into the high-temperature pipeline to flush and cool the pipeline through the nozzle, so that the aims of protecting the high-temperature pipeline and cleaning solid sediments are fulfilled.
Description
Technical Field
The invention relates to the technical field of chemical industry, in particular to a circulating system for protecting high-temperature pipeline chilling and washing solidification of process product gas in coal chemical industry and methanol-to-hydrocarbon.
Background
In the chemical industry, the fluidized bed technology is mostly adopted as an important means for producing chemical products in the coal chemical industry, the methanol chemical industry, the catalytic cracking process and the like, and is also an important link for realizing the production of hydrocarbons by replacing petroleum with other resources.
In the process of catalyst processing, normal production and shutdown and unloading of the fluidized bed reaction-regeneration system, catalyst fine powder particles smaller than a certain particle size flow to downstream cooling equipment along with a process or a replacement medium in a product gas pipeline, and in the process, the catalyst fine powder particles are easily combined with water in the process or the replacement medium and are agglomerated to form sludge, and the sludge is deposited at the bottom of the pipeline due to the action of gravity.
In addition, in the current fluidized bed reaction-regeneration system, in order to avoid the abrasion of catalyst particles on a high-temperature pipeline, wear-resistant linings are mostly arranged in the high-temperature pipeline in the prior art, and a high-temperature medium in the pipeline is usually required to be cooled and is connected with a water cooling system such as a tower and a tank at the tail end, wherein the concentration of water vapor is higher, and the coalescence effect of the catalyst is most serious at the tail end of the cooling system which is communicated with the high-temperature pipeline because of the combination of the catalyst; furthermore, the agglomerated mud catalyst can aggravate agglomeration, water in the mud catalyst is converted into liquid water due to cooling and is adsorbed in the lining, when the mud catalyst is started again, the water can be decomposed in the lining due to high-temperature gasification, the production operation period is shortened, the maintenance cost is increased, and potential safety hazards are easily formed when the lining is seriously damaged.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention removes solid particles carried in high-temperature product gas by washing and recycling the reaction product gas of a methanol-to-hydrocarbons device or the reaction product gas of a catalytic cracking device, realizes the protection of a high-temperature pipeline and reduces the potential safety hazard caused by blockage.
In order to realize the purpose of the invention, the invention adopts the following technical scheme:
the invention provides a circulating system for protecting high-temperature pipeline shock cooling washing solidification, which comprises:
the high-temperature pipeline is used for conveying high-temperature gas containing solid particles to the washing device for washing; the high-temperature pipeline comprises a vertical pipeline and an inclined pipeline communicated with the vertical pipeline, the vertical pipeline and the inclined pipeline are connected through an arc bent pipe, the top of the vertical pipeline is provided with a reaction product gas inlet, the bottom of the inclined pipeline is provided with a reaction product gas outlet, and the upper part of the arc bent pipe is provided with a cooling water spray opening for spraying water to the inside of the high-temperature pipeline so as to cool;
a washing device for washing the high-temperature gas containing solid particles; the washing device is provided with a product gas inlet, a product gas outlet, a washing water outlet and a washing water replenishing port which are communicated with the reaction product gas outlet through pipelines;
the solid-liquid separation device is provided with a liquid inlet, a slurry outlet and a liquid phase outlet which are communicated with the washing water outlet;
a deoxidizer device for removing oxides in the liquid phase separated by the solid-liquid separation device; the deoxidizer device is provided with an inlet communicated with the liquid phase outlet, a water phase outlet and a gas phase outlet containing oxides;
the inner wall of the inclined pipeline is provided with a fan-shaped nozzle for spraying water to the inside of the inclined pipeline so as to form a water film on the inner wall of the inclined pipeline; and recycling one part of the water phase flowing out from the water phase outlet of the deoxidizer device to a washing water replenishing port of the washing device for providing washing water for the washing device, and recycling the other part of the water phase to the fan-shaped nozzle and the washing nozzle for providing washing water for the high-temperature pipeline.
In some specific embodiments, the circulation system further comprises a pressure boosting device and a heat exchanger; and a water phase outlet of the deoxidizer device is connected with an inlet of the supercharging device, an outlet of the supercharging device is connected with an inlet of the heat exchanger, and a water phase subjected to heat exchange by the heat exchanger is recycled to the flushing water replenishing port, the fan-shaped nozzle and the flushing nozzle.
In some preferred embodiments, a plurality of fan-shaped nozzles are arranged in the axial direction of the inclined pipeline; preferably, the water spraying direction of the washing nozzle arranged inside the arc-shaped bent pipe is along the tangent line of the arc-shaped bent pipe.
In some specific embodiments, the inner wall of the vertical pipe is provided with a pipe lining for enhancing the wear resistance and corrosion resistance of the pipe; because the washing device is usually a tower tank type container, a bent pipe part is inevitably formed when high-temperature gas enters the washing device from top to bottom, and the water outlet of the cooling water spray nozzle and the lower edge of the pipeline lining are positioned at the same horizontal line or are lower than the lower edge of the pipeline lining, so that after the cooling water spray is sprayed out in an umbrella shape, the temperature of the high-temperature gas is reduced, and the high-temperature gas and catalyst particles are prevented from scouring and frictional erosion on the part of the pipeline without the lining.
In some specific embodiments, the inclined pipe is inclined at a downward angle with respect to the horizontal direction, and the angle with respect to the horizontal direction is 0 to 90 ° (excluding 90 °), i.e. less than 90 °, such as 20 °,30 °,50 °,80 °; preferably 5 to 45 deg., for example, 15 deg., 30 deg., 40 deg..
The temperature of the high-temperature gas for quenching and washing by adopting the circulating system provided by the invention is less than 350 ℃, and preferably 200-320 ℃; the pressure of the high-temperature gas containing the solid particles is less than 0.8MPa, preferably 0.05-0.2 MPa; the content of the particulate matters in the high-temperature gas containing the solid particles is less than or equal to 186mg/Nm3The particle size of the particles in the high-temperature gas containing the solid particles is smallAt 100 μm.
In the circulation system provided by the invention, the chemical oxygen demand of the water phase in the water phase outlet of the deoxidizer device is less than or equal to 1500mg/L, preferably less than or equal to 1300mg/L; the content of total insoluble substances in the water phase is less than or equal to 100mg/L, preferably less than or equal to 90mg/L.
In the circulation system provided by the invention, the circulation system further comprises a control device, wherein the control device comprises a differential pressure gauge and a flow regulating valve; the differential pressure gauge is used for monitoring the pressure difference in the inclined pipeline, wherein the pressure difference of the high-temperature gas in the inclined pipeline is between 0 and 200kPa, such as 50kPa,100kPa and 150kPa; the flow regulating valve is used for regulating the water spraying amount of the fan-shaped nozzle and the flushing nozzle, and in some specific embodiments, the water spraying flow rate of the fan-shaped nozzle and the flushing nozzle is between 1.0t/h and 8.0t/h, such as 2.0t/h,4.0t/h and 6.0t/h.
The circulating system provided by the invention can be used for treating reaction product gas of a methanol-to-hydrocarbon device or reaction product gas of a catalytic cracking device; as is well known to those skilled in the art, the reaction product gas of the methanol to hydrocarbons plant or the reaction product gas of the catalytic cracking plant may contain solid particles and water produced by itself in the product gas in addition to high temperature gas.
By adopting the technical scheme, the method has the following technical effects:
the invention utilizes the characteristic that the self-produced water in the reaction product gas of a methanol-to-hydrocarbon device or a catalytic cracking device can be recycled, redesigns the product gas pipeline and the accessory arrangement thereof, pressurizes the self-produced water of the circulating system, divides the pressurized self-produced water into two parts of temperature reduction and flushing, and respectively sends the two parts of temperature reduction and flushing to the high-temperature pipeline to carry out flushing and temperature reduction on the pipeline through a nozzle, so as to achieve the purposes of protecting the high-temperature pipeline and cleaning solid sediments, and is particularly suitable for solving the long-term agglomeration problem of solid catalyst contained in a horizontal or certain-angle conveying pipeline; meanwhile, the washing water can enter a subsequent circulating system for utilization, and a new medium cannot be introduced into the subsequent system.
Drawings
FIG. 1: one embodiment of the circulation system provided by the present invention;
FIG. 2: FIG. 1 provides an enlarged view of a portion of a circular arc at an elbow of the circulation system;
FIG. 3: FIG. 1 provides a partial schematic view of an inclined duct of a circulation system;
the device comprises a high-temperature pipeline 1, a washing device 2, a solid-liquid separation device 3, a deoxidizer device 4, a pressurizer 5, a heat exchanger 6, a heat exchanger 7, an arc elbow, 8, a cooling water spray nozzle 9, a vertical pipeline 10, an inclined pipeline 11, a reaction product gas inlet 12, a reaction product gas outlet 13, a product gas outlet 14, a washing water replenishing nozzle 15, a washing water outlet 16, a slurry discharge outlet 17, an inlet 18, a water phase outlet 19, a gas phase outlet 20, a pipeline lining 21, a washing nozzle 22 and a fan-shaped nozzle.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be further described with reference to examples. It should be understood that the following examples are only for better understanding of the present invention and are not intended to limit the present invention to the following examples.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
The invention provides a circulation system for protecting high-temperature pipeline quenching washing and solidifying, which is used for washing solid particles (such as catalyst fine powder and the like) carried in reaction product gas away from the reaction gas so as to avoid conglomeration on the inner wall of a high-temperature pipeline, so that the flux of a product gas pipeline is reduced, the weight of deposited catalyst exceeds the loading capacity of the pipeline, equipment is damaged, and blockage is serious. The circulation system of the present invention mainly comprises: a high-temperature pipeline 1, a washing device 2, a solid-liquid separation device 3 and a deoxidizer device 4;
as shown in fig. 1, the high-temperature pipeline 1 includes a vertical pipeline 9 and an inclined pipeline 10 communicated with the vertical pipeline 9, a joint of the vertical pipeline 9 and the inclined pipeline 10 is connected by an arc elbow 7, a reaction product gas inlet 11 is opened at the top of the vertical pipeline 9, and a reaction product gas outlet 12 is opened at the bottom of the inclined pipeline 10, and is used for conveying the reaction product gas to the system of the present invention for circulation treatment. In some embodiments, the angled duct 10 is angled from 0 to 90, preferably 5 to 45, from horizontal. And a cooling water spray nozzle 8 is arranged above the arc elbow 7 at the joint of the inclined pipeline 10 and the vertical pipeline 9 and used for spraying water to the inside of the high-temperature pipeline 1 and reducing the temperature of high-temperature gas just after entering the vertical pipeline 9 so as to protect the inner wall of the high-temperature pipeline 1.
A washing nozzle 21 for spraying water to the inside of the arc elbow 7 is arranged at the arc elbow 7 at the joint of the inclined pipeline 10 and the vertical pipeline 9; in some preferred embodiments, the water spraying direction of the flushing nozzles 21 in the arc elbow 7 is along the tangential direction of the arc elbow 7, so as to remove solid deposits or sludge accumulated at the corner of the pipeline due to gravity in the high-temperature gas containing solid particles, and avoid blockage in the pipeline. Meanwhile, the fan-shaped nozzle 22 is arranged on the inner wall of the inclined pipeline 10, as is well known to those skilled in the art, the spray channel of the fan-shaped nozzle 22 is large and smooth, the spray is in the shape of a fan with various angles, the fan-shaped section of the spray generates tapered edge spray particles which are fine, and the water flow is uniformly distributed; in some embodiments, as shown in fig. 3, a plurality of fan-shaped nozzles 22 are arranged along the axial direction of the inclined pipeline 10, and the water flow sprayed from the fan-shaped nozzles 22 is propelled along the fan-shaped direction of the pipe wall after entering the pipeline, and contacts with the water flow surface of the next fan-shaped nozzle 22 nozzle to fully flush the solid particles in the reaction product gas; in order to form a water film on the inner wall of the inclined duct 10, which completely covers 360 ° inside the duct, to protect the duct, a corresponding number of fan nozzles 22 may be provided accordingly; in some embodiments, the fan-shaped water mist sprayed from the fan-shaped nozzle 22 has an included angle of less than 180 °, preferably 60 ° to 120 °.
In the circulation system provided by the invention, high-temperature gas passes through the vertical pipeline 9 from top to bottom, passes through the arc elbow 7 and then enters the inclined pipeline 10, and the inner wall of the vertical pipeline 9 is provided with the pipeline lining 20 for enhancing the wear resistance and corrosion resistance of the pipeline; in some embodiments, as shown in fig. 2, the outlet of the cooling water spray 8 is at the same level or lower than the lower edge of the pipe liner 20, so as to prevent the high-temperature gas and catalyst particles from scouring and rubbing the pipe without the pipe liner 20.
The reaction product gas enters the washing device 2 through a product gas inlet on the washing device 2 after being cooled and washed in the high-temperature pipeline 1, enters the device through a washing water replenishing port 14 to be washed, is discharged from a product gas outlet 13 after being washed, and enters a downstream process for continuous processing; in some embodiments, the washing device 2 may be selected from a water washing column, a quench tower, a cooling tower, and the like.
The washing water washed by the washing device 2 flows to a liquid inlet 17 of the solid-liquid separation device 3 through a washing water outlet 15, after entering the solid-liquid separation device 3, the washing water containing solid particles is subjected to liquid-solid separation in the solid-liquid separation device 3, the separated slurry containing the solid particles is discharged from a slurry discharge port 16, and the separated liquid phase is discharged from a liquid phase outlet 19; in some embodiments, the solid-liquid separation device 3 may be a hydrocyclone for separating a liquid phase from a solid phase by centrifugation, or an online backwashing filter for filtering out the solid phase by setting a filter of an online backwashing program may be selected.
The liquid phase water separated by the solid-liquid separation device 3 enters the deoxidizer device 4 through an inlet 17, and the deoxidizer device 4 can be a purification tower, a stripping tower and the like.
In the circulation system of the present invention, a part of the water phase flowing out through the water phase outlet 18 of the deoxidizer device 4 is recycled to the rinsing water replenishing port 14 of the washing device 2 for supplying the rinsing water to the washing device 2, and another part is recycled to the fan-shaped nozzle 22 and the rinsing nozzle 21 for supplying the rinsing water to the high-temperature pipeline 1.
In some specific embodiments, the circulation system further includes a pressure increasing device 5 and a heat exchanger 6, the water phase removed by the deoxidizer device 4 enters the pressure increasing device 5 for pressure increase, and then enters the heat exchanger 6 from the inlet of the heat exchanger 6 for heat exchange, and a part of the washing water after heat exchange is recycled to the washing water replenishing port 14 of the washing device 2, and another part of the washing water after heat exchange is recycled to the fan-shaped nozzle 22 and the washing nozzle 21, so as to provide the washing water for the high-temperature pipeline 1.
In some preferred embodiments, the circulation system further comprises a control device comprising a differential pressure gauge and a flow regulating valve; the differential pressure gauge is arranged at two ends of the inclined pipeline 10 and is used for monitoring the pressure difference of reaction product gas entering the inclined pipeline 10; and a flow rate adjusting valve for adjusting the amount of the sprayed water sprayed from the fan nozzle 22 and the rinse nozzle 21. For example, when the pressure difference of the reaction product gas entering the inclined pipeline 10 is between 0kPa and 200kPa, the water spraying flow rates of the fan-shaped nozzles 22 and the flushing nozzles 21 are set to be changed in proportion within 1.0t/h to 8.0t/h through the flow regulating valves, namely, the higher the pressure difference is, the higher the nozzle flow rate is, the lower the minimum flow rate of each nozzle is not lower than 1.0t/h, so as to prevent the catalyst from coalescing in the high-temperature pipeline 1 in the process.
The circulating system provided by the invention can be used for treating reaction product gas of a methanol-to-hydrocarbon device or reaction product gas of a catalytic cracking device.
At present, a methanol-to-olefin device which treats 180 ten thousand tons of methanol in a certain scale and has an operation load of 80 to 110 percent is taken as an example: a continuous reaction-regeneration mode is used, the reaction pressure is 0.8MPa, methanol is used as a production raw material, the feeding amount is 229.125t/h under the 100 percent load state, low-carbon olefin is generated through the catalytic action in a reactor, the unit consumption of the methanol is 3.0t methanol/t olefin, the unit consumption of the catalyst is 0.8kg/t olefin, and the bulk density of the catalyst is 0.65-0.9 kg/m olefin3After the gas-solid separation of the product gas carrying catalyst particles from the reactor by the multi-stage cyclone separator, the high-temperature energy is recovered in the heat exchanger 6, the pressure of the product gas is 0.62-0.75 MPa, the temperature is 240-300 ℃, and the flow rate is 260600Nm3The catalyst particle content in the product gas is 80-108 mg/Nm3The reaction product gas enters the circulating system provided by the invention as high-temperature gas, the reaction product gas enters the washing device 2 (such as a water washing tower) through the high-temperature pipeline 1, and the treatment medium is water.
After passing through the washing device 2, water in the product gas and cooling washing water are combined into washing water containing solids, the washing water enters the solid-liquid separation device 3 for solid-liquid separation, slurry with the particle content of more than 6000mg/L after separation is discharged to a sewage plant for treatment, cleaner liquid water with the particle content of less than 80mg/L enters the oxide removal system 4 for removing byproducts, the water containing oxides enters the subsequent flow through the gas phase outlet 19, the produced fresh flushing water phase with the pressure of 1.2MPa at 280t/h is pressurized through the flushing water pump and then is cooled to 34 ℃ through the heat exchanger 6, and part of water can be recycled and enters the fan-shaped nozzle 22 and the flushing nozzle 21 according to the working condition so as to protect the high-temperature pipeline 1; another part of the fresh washing water enters the washing device 2 from the washing water replenishing opening 14 to perform self-circulation or outward conveying treatment.
In the start-up process, before the circulation system provided by the invention is used for treating the methanol-to-olefin device to complete nitrogen purging and start heating, deoxygenated water is supplemented into the device from a rinsing water supplementing port 14 of the washing device 2 to establish circulation of the system; and simultaneously, the fan-shaped nozzles 22 and the flushing nozzles 21 in the high-temperature pipeline 1 are used, and because the catalyst content is lower in the purging and temperature rising process, each nozzle is controlled to have the minimum flow rate of 1.0t/h.
In the temperature rise process of the reactor, the medium in the high-temperature pipeline 1 is nitrogen, the temperature is less than 330 ℃, and the nitrogen amount is less than 120000Nm3At this point, the catalyst particle content in the medium is less than 20mg/Nm3. As the reactor gradually rises to 200 ℃, a cooling water spray nozzle 8 is put into use to protect the high-temperature pipeline 1. When the temperature of the reactor rises to 380 ℃, the catalyst is greatly lost in the processes of adding the high-temperature fluidized catalyst into the reactor, adding the catalyst and running under the load of less than 80 percent, and the content of the catalyst particles in the high-temperature pipeline 1 is 150-180 mg/Nm3The flow rate of each of the fan-shaped nozzles 22 and the flushing nozzles 21 is adjusted to the maximum value of 4.0t/h, a water film layer with a certain thickness is formed on the inner wall of the high-temperature pipeline 1, so that the lost catalyst is prevented from being coalesced on the pipe wall in the start-up process, and the water film layer can protect the influence of high-temperature gas on the high-temperature pipeline 1.
In the normal operation flow, when the operation load is 80-110%, the operation condition is equal toThe basic process has the same operating parameters, and the product gas flow is 286660Nm when the maximum flow in the pipeline from the outlet of the multi-stage cyclone separator to the inlet of the quenching tower is 110% of the load3The content of solid particles in the reaction product gas is 119mg/Nm3After the heat of the reaction product gas is recovered from the multi-stage cyclone separator, the temperature is lower than 230 ℃, and the normal water flow of the outlets of the fan-shaped nozzle 22 and the flushing nozzle 21 is 2.4t/h. At the moment, the pressure difference between two ends of the high-temperature pipeline 1 is measured, the set pressure difference is within 0-160 kPa, the flow rates of the fan-shaped nozzles 22 and the flushing nozzles 21 are set to be changed in a direct proportion manner within 1.0-4.0 t/h through the regulating valve, namely the larger the pressure difference is, the larger the nozzle flow rate is, the lowest flow rate of each nozzle is not lower than 1.0t/h, so that the catalyst is prevented from being agglomerated in the high-temperature pipeline 1 in the process.
In the shutdown process, similar to the start-up process, the flow of the reaction product gas is less than 208480Nm in the process of gradually reducing the operation load to be less than 80 percent and transferring and unloading the catalyst3The content of catalyst particles in the high-temperature pipeline 1 is 150-180 mg/Nm3And the flow rate of each fan-shaped nozzle 22 and each flushing nozzle 21 is adjusted to be 4.0t/h, and the washing device 2 and the deoxidizing device 4 continuously use the self-produced water, namely the circulation of the water phase maintaining system after the treatment of the deoxidizing device 4.
When the reactor is stopped feeding, in the process of replacing and purging the reactor by using nitrogen, residual catalyst particles which are not discharged in the reaction-regeneration system enter the washing device 2 through the high-temperature pipeline 1 along with replacement and purging nitrogen, and in the process, the flow rate of the purging nitrogen does not exceed 100000 Nm3And h, the linear velocity of the purge gas in the high-temperature pipeline 1 is lower than 23 m/s in normal operation at the flow rate, the content of solid particles in the reaction product gas is increased, the flow rate of the fan-shaped nozzles 22 and the washing nozzles 21 is still kept adjusted to be 4.0t/h at the maximum, and a water film layer is maintained on the inner wall of the high-temperature pipeline 1 to continuously prevent the catalyst from coalescing in the high-temperature pipeline 1.
Claims (10)
1. A circulation system for protecting high temperature pipeline quenching washing solidification, which is characterized by comprising:
the high-temperature pipeline is used for conveying the high-temperature gas containing the solid particles to the washing device for washing; the high-temperature pipeline comprises a vertical pipeline and an inclined pipeline communicated with the vertical pipeline, the vertical pipeline and the inclined pipeline are connected through an arc bent pipe, the top of the vertical pipeline is provided with a reaction product gas inlet, the bottom of the inclined pipeline is provided with a reaction product gas outlet, and the upper part of the arc bent pipe is provided with a cooling water spray opening for spraying water to the inside of the high-temperature pipeline so as to cool;
a washing device for washing the high-temperature gas containing the solid particles; the washing device is provided with a product gas inlet, a product gas outlet, a washing water outlet and a washing water replenishing port which are communicated with the reaction product gas outlet through pipelines;
the solid-liquid separation device is provided with a liquid inlet, a slurry outlet and a liquid phase outlet which are communicated with the washing water outlet;
a deoxidizer device for removing oxides in the liquid phase separated by the solid-liquid separation device; the deoxidizer device is provided with an inlet communicated with the liquid phase outlet, a water phase outlet and a gas phase outlet containing oxides;
the inner wall of the inclined pipeline is provided with a fan-shaped nozzle for spraying water to the inside of the inclined pipeline so as to form a water film on the inner wall of the inclined pipeline; and one part of the water phase flowing out of the water phase outlet of the deoxidizer device is recycled to a washing water replenishing port of the washing device for providing washing water for the washing device, and the other part of the water phase is recycled to the fan-shaped nozzle and the washing nozzle for providing washing water for the high-temperature pipeline.
2. The circulation system of claim 1, further comprising a pressure boosting device and a heat exchanger;
and a water phase outlet of the deoxidizer device is connected with an inlet of the supercharging device, an outlet of the supercharging device is connected with an inlet of the heat exchanger, and the water phase subjected to heat exchange by the heat exchanger is recycled to the flushing water replenishing port, the fan-shaped nozzle and the flushing nozzle.
3. The circulation system of claim 2, wherein the inclined duct is provided with a plurality of fan-shaped nozzles in an axial direction thereof;
preferably, the water spraying direction of the washing nozzle arranged inside the arc-shaped bent pipe is along the tangent line of the arc-shaped bent pipe.
4. The circulation system of claim 3, wherein the vertical pipes are lined with a pipe lining on the inner wall thereof to enhance wear and corrosion resistance of the pipes;
the water outlet of the cooling water spray nozzle and the lower edge of the pipeline lining are positioned at the same horizontal line or lower than the lower edge of the pipeline lining.
5. A circulation system according to claim 4, characterized in that the inclined pipes are inclined downwards and form an angle of 0-90 °, preferably 5-45 °, with the horizontal.
6. A circulation system according to any one of claims 1 to 5, wherein the temperature of the high temperature gas containing solid particles is less than 350 ℃, preferably 200 to 320 ℃;
the pressure of the high-temperature gas containing the solid particles is less than 0.8MPa, preferably 0.05-0.2 MPa;
the content of particulate matters in the high-temperature gas containing the solid particles is less than or equal to 186mg/Nm3And the particle size of the particles in the high-temperature gas containing the solid particles is less than 100 mu m.
7. A circulation system according to any one of claims 1 to 6, characterized in that the chemical oxygen demand of the aqueous phase in the aqueous phase outlet of the deoxidizer device is less than or equal to 1500mg/L, preferably less than or equal to 1300mg/L;
the content of total insoluble substances in the water phase is less than or equal to 100mg/L, preferably less than or equal to 90mg/L.
8. The circulation system of any one of claims 1-7, further comprising a control device comprising a differential pressure gauge and a flow regulating valve;
the differential pressure gauge is used for monitoring the differential pressure in the inclined pipeline;
and the flow regulating valve is used for regulating the water spraying amount of the fan-shaped nozzle and the flushing nozzle.
9. The circulation system of claim 8, wherein the pressure difference of the high-temperature gas in the inclined pipeline is 0-200 kPa, and the water injection flow rate of the fan-shaped nozzle and the flushing nozzle is 1.0-8.0 t/h.
10. The recycle system of any of claims 1 to 9, wherein the recycle system is operable to treat a reaction product gas of a methanol to hydrocarbons plant or a reaction product gas of a catalytic cracking plant.
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