CN115125031B - Method for discharging agent from lock hopper in S Zorb - Google Patents
Method for discharging agent from lock hopper in S Zorb Download PDFInfo
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- CN115125031B CN115125031B CN202110320898.0A CN202110320898A CN115125031B CN 115125031 B CN115125031 B CN 115125031B CN 202110320898 A CN202110320898 A CN 202110320898A CN 115125031 B CN115125031 B CN 115125031B
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- 238000000034 method Methods 0.000 title claims abstract description 64
- 238000007599 discharging Methods 0.000 title claims abstract description 13
- 239000003463 adsorbent Substances 0.000 claims abstract description 148
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 113
- 230000008929 regeneration Effects 0.000 claims abstract description 86
- 238000011069 regeneration method Methods 0.000 claims abstract description 86
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 56
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 51
- 238000006243 chemical reaction Methods 0.000 claims abstract description 36
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 24
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 24
- 230000005484 gravity Effects 0.000 claims abstract description 21
- 230000008569 process Effects 0.000 claims abstract description 21
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000001257 hydrogen Substances 0.000 claims abstract description 20
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 20
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 18
- 239000002737 fuel gas Substances 0.000 claims description 11
- 238000003860 storage Methods 0.000 claims description 11
- 230000009471 action Effects 0.000 claims description 6
- 230000006837 decompression Effects 0.000 claims description 4
- 229910001873 dinitrogen Inorganic materials 0.000 claims 1
- 239000003795 chemical substances by application Substances 0.000 abstract description 18
- 239000000463 material Substances 0.000 abstract description 6
- 239000003502 gasoline Substances 0.000 description 10
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 5
- 229910052717 sulfur Inorganic materials 0.000 description 5
- 239000011593 sulfur Substances 0.000 description 5
- 238000006477 desulfuration reaction Methods 0.000 description 4
- 230000023556 desulfurization Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000004523 catalytic cracking Methods 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 125000004434 sulfur atom Chemical group 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G25/00—Refining of hydrocarbon oils in the absence of hydrogen, with solid sorbents
- C10G25/12—Recovery of used adsorbent
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
- C10G2300/20—Characteristics of the feedstock or the products
- C10G2300/201—Impurities
- C10G2300/202—Heteroatoms content, i.e. S, N, O, P
Landscapes
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Of Gases By Adsorption (AREA)
Abstract
The invention provides a method for discharging a lock hopper in S Zorb, which comprises the following steps: 1) The adsorbent in the reactor enters a reducer; 2) The adsorbent entering the reducer enters a lock hopper; 3) Depressurizing, introducing nitrogen to replace hydrogen and hydrocarbon, and allowing the adsorbent entering the lock hopper to enter a regeneration feed tank through pressure difference and gravity after the replacement is qualified; 4) The adsorbent entering the regeneration feed tank is lifted to the regenerator by nitrogen for regeneration. When the S Zorb device is stopped for unloading the agent, the method for unloading the agent by using the lock hopper in the S Zorb device does not need to additionally install a temporary agent unloading pipeline, greatly reduces the residual adsorbent amount in the reaction system, accelerates the agent unloading speed, and saves a great amount of manpower and material resources for the whole stopping process.
Description
Technical Field
The invention relates to the technical field of S Zorb adsorption desulfurization, in particular to a method for discharging a lock hopper in S Zorb.
Background
The S Zorb device mainly has the production task of removing sulfur in catalytic gasoline, and meets the requirement of gasoline blending and delivery on sulfur content. The device adopts an S Zorb adsorption desulfurization technology, the raw gasoline is desulfurized based on the adsorption action principle, and sulfur atoms in sulfur-containing compounds are selectively adsorbed by the adsorbent to achieve the purpose of desulfurization. The device raw materials are stable gasoline of two sets of catalytic cracking devices and hydrogen of a reforming device, the main product is desulfurization refined gasoline, the sulfur content in the gasoline is required to be not more than 10mg/kg, and the gasoline product is used as a main gasoline blending component to blend the automotive gasoline which accords with the quality standard of state V and state VI.
As shown in fig. 1, the purpose of the adsorbent circulation transport is to transport the adsorbent having adsorbed sulfur from the reaction section to the regeneration section, and at the same time, transport the regenerated adsorbent from the regeneration section back to the reaction section, and the circulation rate of the adsorbent can be controlled; the above process is realized by automatic control of the step sequence of a lock hopper (D-106), deactivated adsorbent is pumped from a reaction receiver (D-105) at the upper part of a reactor (R-101) to the lock hopper (D-106), then the pressure is reduced, hydrogen and hydrocarbon in the adsorbent are replaced by nitrogen, and the adsorbent is sent to a regeneration feed tank (D-107) by pressure difference and gravity after the replacement is qualified; the lock hopper is in waiting time at the moment, and then the adsorbent in the regeneration feeding tank (D-107) is lifted into the regenerator (R-102) through nitrogen for regeneration reaction; the adsorbent conveying line of the regeneration feed tank (D-107) is provided with a slide valve for controlling the circulation rate of the adsorbent; the regenerated adsorbent in the regenerator (R-102) is lifted to a regeneration receiver (D-110) through a slide valve and nitrogen, then is sent to a lock hopper (D-106) through pressure difference and gravity, oxygen in the lock hopper (D-106) is replaced by nitrogen, hydrogen is used for boosting after the replacement is qualified, and finally is sent to a reducer (D-102) through pressure difference and gravity, and is returned to the reaction system after reduction. The regeneration and the adsorbent to be regenerated realize the mutual transportation of the reaction system and the regeneration system and the isolation of oxyhydrogen environment through a lock hopper (D-106), and the cyclic transportation of the adsorbent is independently completed by a lock hopper control system in the step sequence operation.
All the adsorbents in the reaction system are discharged through the regeneration receiver, and the specific steps are as follows: the adsorbent of the reaction system is firstly conveyed to the regenerator through a lock hopper, and finally discharged through a regeneration receiver. In the shutdown and unloading process of the device, the traditional method is as follows: the operator places the lock hopper in a "shutdown discharge" mode. In this way, the adsorbent will simply be discharged from the reactor and will not pass from the regenerator back to the reactor through the lock hopper until the reaction receiver cannot receive the adsorbent by normal flooding. The operator then places a temporary discharge line into the bottom of the reactor to discharge the adsorbent from the bottom of the reactor to a lock hopper. The remaining adsorbent at the bottom of the reactor was continuously discharged to a lock hopper using thermally cycled hydrogen as a lift gas until the reactor was empty. And finally, a temporary unloading line at the bottom of the reducer is used for unloading the adsorbent in the reducer to a lock hopper until the reducer is emptied, so that the adsorbent in the whole reaction system is unloaded. In the traditional operation process, the shutdown and the unloading of the S Zorb device are mostly not smooth, and particularly, in the middle and later stages of the unloading, besides the temporary agent transferring lines which are required to be installed and put into operation, a large amount of residual adsorbent remains in the reaction system after the shutdown, sometimes even up to 3-4 tons, so that considerable trouble is brought to the overhaul of the later stage device, and the reaction and the unloading are a very critical node for the shutdown of the S Zorb device.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for discharging a lock hopper in S Zorb, which comprises the following steps: 1) The adsorbent in the reactor enters a reducer; 2) The adsorbent entering the reducer enters a lock hopper; 3) Depressurizing, introducing nitrogen to replace hydrogen and hydrocarbon, and allowing the adsorbent entering the lock hopper to enter a regeneration feed tank through pressure difference and gravity after the replacement is qualified; 4) The adsorbent entering the regeneration feed tank is lifted to the regenerator by nitrogen for regeneration. When the method for unloading the agent is stopped, the temporary agent transfer pipeline is not required to be additionally arranged by using the method for unloading the agent by using the lock hopper in the S Zorb, the residual adsorbent amount in the reaction system is greatly reduced, the agent unloading speed is accelerated, and a large amount of manpower and material resources are saved for the whole stopping process.
The invention is realized by the following technical scheme:
the invention provides a method for discharging a lock hopper in S Zorb, which comprises the following steps:
1) The adsorbent in the reactor enters a reducer;
2) The adsorbent entering the reducer enters a lock hopper;
3) Depressurizing, introducing nitrogen to replace hydrogen and hydrocarbon, and allowing the adsorbent entering the lock hopper to enter a regeneration feed tank through pressure difference and gravity after the replacement is qualified; hydrocarbons generally include gas phase gasoline;
4) The adsorbent entering the regeneration feed tank is lifted to the regenerator by nitrogen for regeneration. The nitrogen lift serves to transport the adsorbent.
Preferably, the method further comprises at least one of the following technical characteristics:
11 In step 1), when the bed height of the adsorbent is higher than that of the reducer, the adsorbent in the reactor enters the reducer under the action of gravity; when the bed height of the adsorbent is not higher than that of the reducer, the reducer is communicated with the lock hopper, the pressure of the lock hopper is controlled to be lower than that of the reactor, and the adsorbent in the reactor enters the reducer; the communicating valve can be opened and closed remotely manually, so that the communicating of the reducer and the lock hopper is realized;
21 In step 2), controlling the pressure of the lock hopper to be lower than the pressure of the reactor, and enabling the adsorbent entering the reducer to enter the lock hopper;
31 Step 3) comprises the steps of:
a) Decompression to the fuel gas pipe network;
b) Decompression to torch;
c) N 2 sweeps hydrocarbons in the lock hopper to a flare;
d) N 2 pressure adjustment, so that the pressure of the lock hopper is higher than the pressure of the regeneration feed tank;
e) The adsorbent entering the lock hopper enters a regeneration feed tank;
32 In step 3), the hydrocarbon content is replaced to be less than or equal to 0.5v percent, and the hydrocarbon is qualified.
More preferably, in feature 11), the pressure difference between the reactor and the lock hopper is between 0.1 and 0.4Mpa, such as between 0.1 and 0.3Mpa or between 0.3 and 0.4Mpa.
More preferably, in feature 21), the pressure difference between the reactor and the lock hopper is between 0.1 and 0.4MPa, such as between 0.1 and 0.3MPa or between 0.3 and 0.4MPa.
More preferably, feature 31), further comprising at least one of the following technical features:
a1 In step a), the pressure is released until the pressure is higher than the pressure of the fuel gas pipe network, and the pressure difference is 0.015-0.05 MPa, for example, the pressure difference is 0.015-0.03 MPa or 0.03-0.05 MPa; for example: the pressure is relieved to 0.6MPa, which is 0.015MPa higher than the pressure of the fuel gas pipe network;
b1 In step b), the pressure is released until the pressure is higher than the pressure of the torch, and the pressure difference is 0.015-0.05 MPa, such as 0.015-0.03 MPa or 0.03-0.05 MPa; for example: the pressure is relieved to 0.025MPa, which is 0.015MPa higher than the pressure of the torch;
d1 In step d), the pressure difference between the lock hopper and the regeneration feed tank is 0.035-0.1 MPa, such as 0.035-0.06 MPa or 0.06-0.1 MPa.
Preferably, step 3) is performed in the same manner as the step of discharging the catalyst from the reaction receiver and introducing nitrogen to replace hydrogen and hydrocarbon, and after the replacement is qualified, the adsorbent entering the lock hopper enters the regeneration feed tank by pressure difference and gravity, and the operation of step 3) is performed by automatic control of the discharge of the catalyst from the reactor receiver.
Preferably, step 4) is performed using automatic control of the discharge from the reactor receiver as in step 4) where the adsorbent entering the regeneration feed tank is regenerated by lifting it to the regenerator with nitrogen.
Preferably, the method further comprises the following steps:
5) The adsorbent regenerated by the regenerator is lifted to a regeneration receiver through nitrogen; the nitrogen lifting function is to transport the adsorbent;
6) The adsorbent entering the regeneration receiver is lifted by nitrogen into the adsorbent storage tank. The nitrogen lift serves to transport the adsorbent.
More preferably, step 5) is performed by using automatic control of the discharge from the reactor receiver in the same manner as the step of lifting the adsorbent regenerated by the regenerator to the regeneration receiver by nitrogen in the discharge from the reaction receiver.
More preferably, step 6) is the same as the step of lifting the adsorbent entering the regeneration receiver from the blowdown from the reaction receiver by nitrogen into the adsorbent storage tank.
The invention relates to a method for discharging a lock hopper in S Zorb, which comprises the following steps: 1) The adsorbent in the reactor enters a reducer; 2) The adsorbent entering the reducer enters a lock hopper; 3) Depressurizing, introducing nitrogen to replace hydrogen and hydrocarbon, and allowing the adsorbent entering the lock hopper to enter a regeneration feed tank through pressure difference and gravity after the replacement is qualified; 4) The adsorbent entering the regeneration feed tank is lifted to the regenerator by nitrogen for regeneration. The method can also comprise the following steps: 5) The adsorbent regenerated by the regenerator is lifted to a regeneration receiver through nitrogen; the nitrogen lifting function is to transport the adsorbent; 6) The adsorbent entering the regeneration receiver is lifted by nitrogen into the adsorbent storage tank. The nitrogen lift serves to transport the adsorbent. Step 3), step 4) and step 5) are the same as the automatic control of the step sequence of the original lock hopper (D-106), and step 1), step 2) and step 6) are manually operated, so that the method for unloading the lock hopper in the S Zorb can realize semi-automatic unloading. When the method for unloading the agent is stopped, the temporary agent transfer pipeline is not required to be additionally arranged by using the method for unloading the agent by using the lock hopper in the S Zorb, the residual adsorbent amount in the reaction system is greatly reduced, the agent unloading speed is accelerated, and a large amount of manpower and material resources are saved for the whole stopping process.
Drawings
FIG. 1 is a flow chart of adsorbent recycle delivery.
FIG. 2 is a flow chart of the lock hopper discharge method in S Zorb of the invention.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention.
Example 1
A method for discharging a lock hopper in S Zorb, as shown in fig. 2, comprising the steps of:
1) The adsorbent in the reactor enters a reducer; when the bed height of the adsorbent is higher than that of the reducer, the adsorbent in the reactor enters the reducer under the action of gravity; when the bed height of the adsorbent is not higher than that of the reducer, the reducer is communicated with the lock hopper through a manual remote switch communication valve, the pressure of the lock hopper is controlled to be lower than the pressure of the reactor by 0.1MPa, and the adsorbent in the reactor enters the reducer;
2) The adsorbent entering the reducer enters a lock hopper; controlling the pressure of the lock hopper to be lower than that of the reactor, and enabling the adsorbent entering the reducer to enter the lock hopper, wherein the pressure difference between the reactor and the lock hopper is 0.1MPa;
3) Depressurizing, introducing nitrogen to replace hydrogen and hydrocarbon, and after the hydrogen content is replaced to be 0.5% by volume, allowing the adsorbent entering the lock hopper to enter a regeneration feed tank through pressure difference and gravity; the method specifically comprises the following steps:
a) The pressure is relieved to a fuel gas pipe network, wherein the pressure is relieved to 0.6MPa, and is about 0.015MPa higher than the pressure of the fuel gas pipe network;
b) Releasing pressure to the torch, wherein the pressure is released to 0.025MPa, which is about 0.015MPa higher than the pressure of the torch;
c) N 2 sweeps hydrocarbons in the lock hopper to a flare;
d) N 2 is regulated to ensure that the pressure of the lock hopper is higher than the pressure of the regeneration feeding tank, and the pressure difference between the lock hopper and the regeneration feeding tank is 0.035Mpa;
e) The adsorbent entering the lock hopper enters a regeneration feed tank;
step 3) is the same as the step that the adsorbent entering the lock hopper enters the regeneration feeding tank through pressure difference and gravity after the replacement is qualified by carrying out depressurization in the unloading process from the reaction receiver and introducing nitrogen to replace hydrogen and hydrocarbon, and the operation of the step 3) is carried out by utilizing the automatic control of unloading process from the reactor receiver;
4) The adsorbent entering the regeneration feed tank is lifted to a regenerator through nitrogen for regeneration;
step 4) the operation of step 4) is performed by utilizing automatic control of unloading from the reactor receiver, as in the step of lifting the adsorbent entering the regeneration feed tank from the reaction receiver to the regenerator through nitrogen for regeneration;
5) The adsorbent regenerated by the regenerator is lifted to a regeneration receiver through nitrogen;
Step 5) the operation of step 5) is performed by using the automatic control of the unloading from the reactor receiver, as in the step of lifting the adsorbent regenerated by the regenerator to the regeneration receiver by nitrogen in the unloading from the reaction receiver;
6) The adsorbent entering the regeneration receiver is lifted by nitrogen into the adsorbent storage tank.
Step 6) is the same as the step of lifting the adsorbent entering the regeneration receiver from the blowdown from the reaction receiver by nitrogen into the adsorbent storage tank.
Step 3), step 4) and step 5) are the same as the automatic control of the step sequence of the original lock hopper (D-106), and step 1), step 2) and step 6) are manually operated, so that the method for unloading the lock hopper in the S Zorb can realize semi-automatic unloading.
When the shutdown unloading is carried out, the method for unloading the adsorbent by using the lock hopper in the S Zorb is used, so that the residual adsorbent in the reaction system is greatly reduced, the residual adsorbent is controlled within 1 ton, and meanwhile, the unloading speed is also increased. Taking an S Zorb device with an elevation of 120 ten thousand tons/year as an example, the previous unloading amount can be at least over 12 hours, and the whole unloading process is controlled to be completed within 6-8 hours after the unloading method of the lock hopper in the S Zorb is used. In addition, the method for unloading the lock hopper in the S Zorb does not need to additionally install a temporary transfer agent pipeline, and a large amount of manpower and material resources are saved for the whole shutdown process.
Example 2
A method for discharging a lock hopper in S Zorb, comprising the steps of:
1) The adsorbent in the reactor enters a reducer; when the bed height of the adsorbent is higher than that of the reducer, the adsorbent in the reactor enters the reducer under the action of gravity; when the bed height of the adsorbent is not higher than that of the reducer, the reducer is communicated with the lock hopper through a manual remote switch communication valve, the pressure of the lock hopper is controlled to be lower than the pressure of the reactor by 0.4MPa, and the adsorbent in the reactor enters the reducer;
2) The adsorbent entering the reducer enters a lock hopper; controlling the pressure of the lock hopper to be lower than that of the reactor, and enabling the adsorbent entering the reducer to enter the lock hopper, wherein the pressure difference between the reactor and the lock hopper is 0.4MPa;
3) Depressurizing, introducing nitrogen to replace hydrogen and hydrocarbon, and after the hydrogen content is replaced to be 0.3v%, allowing the adsorbent entering the lock hopper to enter a regeneration feed tank through pressure difference and gravity; the method specifically comprises the following steps:
a) The pressure is relieved to a fuel gas pipe network, wherein the pressure is relieved to 0.635MPa, and the pressure is about 0.05MPa higher than the pressure of the fuel gas pipe network;
b) Releasing pressure to a torch, wherein the pressure is released to 0.06MPa, which is about 0.05MPa higher than the pressure of the torch;
c) N 2 sweeps hydrocarbons in the lock hopper to a flare;
d) N 2 is regulated to ensure that the pressure of the lock hopper is higher than the pressure of the regeneration feeding tank, and the pressure difference between the lock hopper and the regeneration feeding tank is 0.06Mpa;
e) The adsorbent entering the lock hopper enters a regeneration feed tank;
step 3) is the same as the step that the adsorbent entering the lock hopper enters the regeneration feeding tank through pressure difference and gravity after the replacement is qualified by carrying out depressurization in the unloading process from the reaction receiver and introducing nitrogen to replace hydrogen and hydrocarbon, and the operation of the step 3) is carried out by utilizing the automatic control of unloading process from the reactor receiver;
4) The adsorbent entering the regeneration feed tank is lifted to a regenerator through nitrogen for regeneration;
step 4) the operation of step 4) is performed by utilizing automatic control of unloading from the reactor receiver, as in the step of lifting the adsorbent entering the regeneration feed tank from the reaction receiver to the regenerator through nitrogen for regeneration;
5) The adsorbent regenerated by the regenerator is lifted to a regeneration receiver through nitrogen;
Step 5) the operation of step 5) is performed by using the automatic control of the unloading from the reactor receiver, as in the step of lifting the adsorbent regenerated by the regenerator to the regeneration receiver by nitrogen in the unloading from the reaction receiver;
6) The adsorbent entering the regeneration receiver is lifted by nitrogen into the adsorbent storage tank.
Step 6) is the same as the step of lifting the adsorbent entering the regeneration receiver from the blowdown from the reaction receiver by nitrogen into the adsorbent storage tank.
Step 3), step 4) and step 5) are the same as the automatic control of the step sequence of the original lock hopper (D-106), and step 1), step 2) and step 6) are manually operated, so that the method for unloading the lock hopper in the S Zorb can realize semi-automatic unloading.
When the shutdown unloading is carried out, the method for unloading the adsorbent by using the lock hopper in the S Zorb is used, so that the residual adsorbent in the reaction system is greatly reduced, the residual adsorbent is controlled within 1 ton, and meanwhile, the unloading speed is also increased. Taking an S Zorb device with an elevation of 120 ten thousand tons/year as an example, the previous unloading amount can be at least over 12 hours, and the whole unloading process is controlled to be completed within 6-8 hours after the unloading method of the lock hopper in the S Zorb is used. In addition, the method for unloading the lock hopper in the S Zorb does not need to additionally install a temporary transfer agent pipeline, and a large amount of manpower and material resources are saved for the whole shutdown process.
Example 3
A method for discharging a lock hopper in S Zorb, comprising the steps of:
1) The adsorbent in the reactor enters a reducer; when the bed height of the adsorbent is higher than that of the reducer, the adsorbent in the reactor enters the reducer under the action of gravity; when the bed height of the adsorbent is not higher than that of the reducer, the reducer is communicated with the lock hopper through a manual remote switch communication valve, the pressure of the lock hopper is controlled to be lower than the pressure of the reactor by 0.3MPa, and the adsorbent in the reactor enters the reducer;
2) The adsorbent entering the reducer enters a lock hopper; controlling the pressure of the lock hopper to be lower than that of the reactor, and enabling the adsorbent entering the reducer to enter the lock hopper, wherein the pressure difference between the reactor and the lock hopper is 0.3MPa;
3) Depressurizing, introducing nitrogen to replace hydrogen and hydrocarbon, and after the hydrogen content is replaced to be 0.2v%, allowing the adsorbent entering the lock hopper to enter a regeneration feed tank through pressure difference and gravity; the method specifically comprises the following steps:
a) The pressure is relieved to a fuel gas pipe network, wherein the pressure is relieved to 0.615MPa, and the pressure is about 0.03MPa higher than the pressure of the fuel gas pipe network;
b) Releasing pressure to a torch, wherein the pressure is released to 0.04MPa, which is about 0.03MPa higher than the pressure of the torch;
c) N 2 sweeps hydrocarbons in the lock hopper to a flare;
d) N 2 is regulated to ensure that the pressure of the lock hopper is higher than the pressure of the regeneration feeding tank, and the pressure difference between the lock hopper and the regeneration feeding tank is 0.1Mpa;
e) The adsorbent entering the lock hopper enters a regeneration feed tank;
step 3) is the same as the step that the adsorbent entering the lock hopper enters the regeneration feeding tank through pressure difference and gravity after the replacement is qualified by carrying out depressurization in the unloading process from the reaction receiver and introducing nitrogen to replace hydrogen and hydrocarbon, and the operation of the step 3) is carried out by utilizing the automatic control of unloading process from the reactor receiver;
4) The adsorbent entering the regeneration feed tank is lifted to a regenerator through nitrogen for regeneration;
step 4) the operation of step 4) is performed by utilizing automatic control of unloading from the reactor receiver, as in the step of lifting the adsorbent entering the regeneration feed tank from the reaction receiver to the regenerator through nitrogen for regeneration;
5) The adsorbent regenerated by the regenerator is lifted to a regeneration receiver through nitrogen;
Step 5) the operation of step 5) is performed by using the automatic control of the unloading from the reactor receiver, as in the step of lifting the adsorbent regenerated by the regenerator to the regeneration receiver by nitrogen in the unloading from the reaction receiver;
6) The adsorbent entering the regeneration receiver is lifted by nitrogen into the adsorbent storage tank.
Step 6) is the same as the step of lifting the adsorbent entering the regeneration receiver from the blowdown from the reaction receiver by nitrogen into the adsorbent storage tank.
Step 3), step 4) and step 5) are the same as the automatic control of the step sequence of the original lock hopper (D-106), and step 1), step 2) and step 6) are manually operated, so that the method for unloading the lock hopper in the S Zorb can realize semi-automatic unloading.
When the shutdown unloading is carried out, the method for unloading the adsorbent by using the lock hopper in the S Zorb is used, so that the residual adsorbent in the reaction system is greatly reduced, the residual adsorbent is controlled within 1 ton, and meanwhile, the unloading speed is also increased. Taking an S Zorb device with an elevation of 120 ten thousand tons/year as an example, the previous unloading amount can be at least over 12 hours, and the whole unloading process is controlled to be completed within 6-8 hours after the unloading method of the lock hopper in the S Zorb is used. In addition, the method for unloading the lock hopper in the S Zorb does not need to additionally install a temporary transfer agent pipeline, and a large amount of manpower and material resources are saved for the whole shutdown process.
In the traditional operation process, the shutdown and the unloading of the S Zorb device are mostly not smooth, and particularly, in the middle and later stages of the unloading, besides the temporary agent transferring lines which are required to be installed and put into operation, a large amount of residual adsorbent remains in the reaction system after the shutdown, sometimes even up to 3-4 tons, so that considerable trouble is brought to the overhaul of the later stage device, and the reaction and the unloading are a very critical node for the shutdown of the S Zorb device.
While the invention has been described with respect to preferred embodiments thereof, it will be understood by those skilled in the art that various modifications and additions may be made without departing from the scope of the invention. Equivalent embodiments of the present invention will be apparent to those skilled in the art having the benefit of the teachings disclosed herein, when considered in the light of the foregoing disclosure, and without departing from the spirit and scope of the invention; meanwhile, any equivalent changes, modifications and evolution of the above embodiments according to the essential technology of the present invention still fall within the scope of the technical solution of the present invention.
Claims (9)
1. A method for discharging a lock hopper in S Zorb, comprising the steps of:
1) The adsorbent in the reactor enters a reducer;
2) The adsorbent entering the reducer enters a lock hopper;
3) Depressurizing, introducing nitrogen to replace hydrogen and hydrocarbon, and allowing the adsorbent entering the lock hopper to enter a regeneration feed tank through pressure difference and gravity after the replacement is qualified;
4) The adsorbent entering the regeneration feed tank is lifted to a regenerator through nitrogen for regeneration;
11 In step 1), when the bed height of the adsorbent is higher than that of the reducer, the adsorbent in the reactor enters the reducer under the action of gravity; when the bed height of the adsorbent is not higher than that of the reducer, the reducer is communicated with the lock hopper, the pressure of the lock hopper is controlled to be lower than that of the reactor, and the adsorbent in the reactor enters the reducer;
21 In step 2), controlling the pressure of the lock hopper to be lower than the pressure of the reactor, and enabling the adsorbent entering the reducer to enter the lock hopper;
31 Step 3) comprises the steps of:
a) Decompression to the fuel gas pipe network;
b) Decompression to torch;
c) N 2 sweeps hydrocarbons in the lock hopper to a flare;
d) N 2 pressure adjustment, so that the pressure of the lock hopper is higher than the pressure of the regeneration feed tank;
e) The adsorbent entering the lock hopper enters a regeneration feed tank;
32 In step 3), the hydrocarbon content is replaced to be less than or equal to 0.5v percent, and the hydrocarbon is qualified.
2. The process for the discharge of lock hoppers according to claim 1, wherein in the feature 11), the pressure difference between the reactor and the lock hoppers is 0.1 to 0.4MPa.
3. The process for lock hopper discharge in S Zorb according to claim 1, wherein in the feature 21), a pressure difference between the reactor and the lock hopper is 0.1 to 0.4MPa.
4. The S Zorb lock hopper discharge method as claimed in claim 1, wherein in the feature 31), at least one of the following technical features is included:
a1 In step a), the pressure is relieved until the pressure is higher than the pressure of a fuel gas pipe network, and the pressure difference is 0.015-0.05 MPa;
b1 In step b), the pressure is relieved until the pressure is higher than the pressure of the torch, and the pressure difference is 0.015-0.05 MPa;
d1 In step d), the pressure difference between the lock hopper and the regeneration feed tank is 0.035-0.1 MPa.
5. The method for unloading the lock hopper from the S Zorb according to claim 1, wherein the step 3) is performed by performing the same step of unloading the reactor receiver by automatically controlling the unloading from the reactor receiver as the step of unloading the lock hopper from the regeneration feed tank by pressure difference and gravity after the replacement is passed by pressurizing the lock hopper and introducing nitrogen to replace hydrogen and hydrocarbon.
6. The S Zorb lock hopper unloading method according to claim 1, wherein step 4) is the same as the step of lifting the adsorbent entering the regeneration feed tank from the reactor receiver to the regenerator by nitrogen gas for regeneration, and the operation of step 4) is performed by automatic control of the unloading from the reactor receiver.
7. The method of discharging lock hoppers of claim 1, further comprising the steps of:
5) The adsorbent regenerated by the regenerator is lifted to a regeneration receiver through nitrogen;
6) The adsorbent entering the regeneration receiver is lifted by nitrogen into the adsorbent storage tank.
8. The method for unloading the adsorbent from the lock hopper in S Zorb according to claim 7, wherein the step 5) is performed by using an automatic control of unloading the adsorbent from the reactor receiver in the same manner as the step of lifting the adsorbent regenerated from the regenerator to the regeneration receiver by nitrogen.
9. The S Zorb lock hopper unloading method of claim 7, wherein step 6) is the same as the step of lifting the adsorbent entering the regeneration receiver from the reaction receiver into the adsorbent storage tank by nitrogen.
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