CN107721799A - The method that parallel reactor pattern automatically switches - Google Patents

The method that parallel reactor pattern automatically switches Download PDF

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Publication number
CN107721799A
CN107721799A CN201710981348.7A CN201710981348A CN107721799A CN 107721799 A CN107721799 A CN 107721799A CN 201710981348 A CN201710981348 A CN 201710981348A CN 107721799 A CN107721799 A CN 107721799A
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China
Prior art keywords
reactor
regeneration
process stream
automatically switches
pattern
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CN201710981348.7A
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Chinese (zh)
Inventor
殷家云
任臻
俞旭波
姚益民
吴德荣
何琨
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Sinopec Engineering Group Co Ltd
Sinopec Shanghai Engineering Co Ltd
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Sinopec Engineering Group Co Ltd
Sinopec Shanghai Engineering Co Ltd
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Priority to CN201710981348.7A priority Critical patent/CN107721799A/en
Publication of CN107721799A publication Critical patent/CN107721799A/en
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C4/00—Preparation of hydrocarbons from hydrocarbons containing a larger number of carbon atoms
    • C07C4/02—Preparation of hydrocarbons from hydrocarbons containing a larger number of carbon atoms by cracking a single hydrocarbon or a mixture of individually defined hydrocarbons or a normally gaseous hydrocarbon fraction
    • C07C4/06—Catalytic processes
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C1/00—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon
    • C07C1/20—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon starting from organic compounds containing only oxygen atoms as heteroatoms
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D301/00—Preparation of oxiranes
    • C07D301/02—Synthesis of the oxirane ring
    • C07D301/03—Synthesis of the oxirane ring by oxidation of unsaturated compounds, or of mixtures of unsaturated and saturated compounds
    • C07D301/12—Synthesis of the oxirane ring by oxidation of unsaturated compounds, or of mixtures of unsaturated and saturated compounds with hydrogen peroxide or inorganic peroxides or peracids
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D303/00—Compounds containing three-membered rings having one oxygen atom as the only ring hetero atom
    • C07D303/02—Compounds containing oxirane rings
    • C07D303/04—Compounds containing oxirane rings containing only hydrogen and carbon atoms in addition to the ring oxygen atoms
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2523/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group C07C2521/00
    • C07C2523/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group C07C2521/00 of the iron group metals or copper
    • C07C2523/89—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group C07C2521/00 of the iron group metals or copper combined with noble metals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P30/00—Technologies relating to oil refining and petrochemical industry
    • Y02P30/20—Technologies relating to oil refining and petrochemical industry using bio-feedstock
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P30/00—Technologies relating to oil refining and petrochemical industry
    • Y02P30/40—Ethylene production

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

The present invention relates to a kind of method that parallel reactor pattern automatically switches, mainly solve the problems, such as that security reliability is poor in the prior art, operating efficiency is low, operation element amount is big.A kind of method that the present invention automatically switches by using parallel reactor pattern, the method to be automatically switched using parallel reactor pattern, quantity N=2~6 of tandem reactor, normally realize that a key automatically switches with two kinds of operator schemes of regeneration regime, both original safety interlocking function had been retained, again without manual operation, the technical scheme for being normally reduced to 0.1 second with regeneration regime switching time preferably solves above mentioned problem, during automatically switching available for parallel reactor.

Description

The method that parallel reactor pattern automatically switches
Technical field
The present invention relates to a kind of method that parallel reactor pattern automatically switches.
Background technology
In chemical process device production process, more chemical reactor parallel connection technology flows are used to improve the production of chemicals Amount, when a reactor catalyst regenerative operation in more chemical reactor parallel connections, the reactor needs to be switched out, its Remaining reactor is still up, to ensure the operating of chemical process process units continuous and stable at full capacity.It is of the prior art CN201210484634.X is used for the protection interlock system and method for paste state bed reactor filter, discloses by using guarantor Safety interlock system is protected, solves the technical problem that filter is scrapped under abnormal condition by carbon distribution or sintering. CN201510500998.6 prevents the method that ammonium nitrate fires in high-tower granulation production nitrate-based compound fertilizer technique, discloses and passes through Overtemperature alarm interlocking protective system is set to enter trip temperature implementing monitoring to reactor, to improve production nitrate-based compound fertilizer technique peace The method of full property.A kind of high temperature interlocking esterification carbonylation units suitable for synthesis gas preparing ethylene glycol of CN201510987150.0, it is public Open and set up emergency cut-off, emergency opening valve in each key component, connected flare line, so as to protect oxonation device, have Effect prevents oxonation device because temperature runaway explodes, and protects production line and the life security of worker.
In the prior art, CN201210484634.X and CN201510500998.6 and CN201510987150.0 be only The process and technical measures in nominal situation, protecting reactor are disclosed, and considers nominal situation and accident conditions Switching.But prior art only considers the reactor interlock protection function under normal operating operating mode, once reactor enters again Raw operating mode, reactor need to be cut out, be transferred to manual mode from total technological process, could so complete the regeneration behaviour of reactor Make.When reactor regenerates, interlocking need to be switched to bypass, now reactor lacks interlock protection, or needs artificial by portion There is the possibility of human operational error on or off position in sub-valve imperative operation.Thus, there is security reliability in prior art Difference, the problem of operating efficiency is low, operation element amount is big.
The content of the invention
The technical problems to be solved by the invention are that security reliability is poor in the prior art, operating efficiency is low, operation element Measure the problem of big, there is provided a kind of method that new parallel reactor pattern automatically switches, with security reliability difference is good, work effect The advantages of rate is high, operation element amount is small.
To solve the above problems, the technical solution adopted by the present invention is as follows：What a kind of parallel reactor pattern automatically switched Method, realize parallel reactor " bringing normally into operation " and " regenerative operation " two kinds of different operation modes in the active station of automatic instrument(s) or One key switching on person's auxiliary operation platform, in " bringing normally into operation " pattern, all interlock protection function normal operations of reactor, Fully meet the requirement of protection process equipment；When " regenerative operation " pattern is switched to, the reactor joins into regeneration regime Guard mode is locked, now original interlock includes following several mapping modes：(1) reactor outlet temperature interlocking setting value It is automatically changed to the protection value of regeneration；(2) reactor process material charging during regenerative operation must stop, while to prevent again Reactor maloperation charging when raw, process stream material inlet valve, discharge valve will pass through interlock system positive closing；(3) again Reactor carries out regenerative operation under raw operator scheme, and main technological process is still up；(4) reactor regenerate when, with Main technological process is unrelated, and all signals that can trigger interlockings action of other positions of main technological process indirectly, which are all bypassed, to be had no Effect；(5) fault stop signal of the main other reactors of work flow does not interfere with the regenerative operation of the reactor yet.
In above-mentioned technical proposal, it is preferable that nominal situation is less than or equal to 0.1 second with regeneration regime switching time.
In above-mentioned technical proposal, it is preferable that quantity N=2~6 of tandem reactor.
In above-mentioned technical proposal, it is preferable that exemplified by setting N=2 platform reactors, when the normal operation of reactor 2 and reaction During 3 regenerative operation of device, process stream inlet valve 11 is opened, and process stream outlet valve 13 is opened；Process stream inlet valve 12 are closed, and process stream outlet valve 14 is closed；Pass through process stream inlet valve 11 from process-stream charging 21 out-of-bounds Enter reactor 2 to be chemically reacted, raw material is changed into product and flowed out by process stream outlet valve 13, the work of outflow Skill material is sent out out-of-bounds as process-stream discharging 23.
The method to be automatically switched using parallel reactor pattern of the present invention, quantity N=2~6 of parallel reactor.Just Normal operating mode had both retained original safety interlocking function, again need not with two kinds of operator schemes of regeneration regime, realizing that a key automatically switches Manual hand manipulation, nominal situation were reduced to 0.1 second with regeneration regime switching time from 60~180 seconds；Thus, parallel reactor Security reliability is added, operating efficiency is improved, reduces operation element amount, preferable technique effect is achieved, achieves Preferable technique effect.
Brief description of the drawings
Fig. 1 is the process flow diagram that parallel reactor pattern automatically switches；
In Fig. 1：1 operator scheme one key switching facility, 2,3 reactors, 11,12 process stream inlet valves, 13,14 techniques Material outlet valve, the charging of 21 process-streams, 22 process streams, the discharging of 23 process-streams.
Exemplified by N=2 platform reactors are set.
When 3 regenerative operation of the normal operation of reactor 2 and reactor, process stream inlet valve 11 is opened, process stream Outlet valve 13 is opened；Process stream inlet valve 12 is closed, and process stream outlet valve 14 is closed.From technique thing out-of-bounds Flow into material 21 to enter reactor 2 by process stream inlet valve 11 and chemically reacted, raw material is changed into product and passed through Process stream outlet valve 13 is flowed out, and the process stream of outflow is sent out out-of-bounds as process-stream discharging 23.Pass through the present invention's Operator scheme one key switching facility 1, it is possible to achieve (1) normal operation of reactor 2, the regenerative operation of reactor 3 and (2) reactor 3 Normal operation, the regenerative operation of reactor 2, the key between above-mentioned (1), (2) automatically switch.
Below by embodiment, the invention will be further elaborated, but is not limited only to the present embodiment.
Embodiment
【Comparative example 1】
In prior art processes process units, nominal situation and two kinds of mutual handoff procedures of pattern of regeneration regime, using people Work is manually operated, and handoff procedure spends 60~180 seconds time, and security reliability is poor, operating efficiency is low, operation element amount is big.
【Embodiment 1】
Production scale is 11.5 ten thousand tons/year of ethylene units, using the method for automatic switchover parallel reactor pattern of the present invention, Cracking gas removes acetylene, propine and allene impurity therein using front-end hydrogenation technological process, parallel reactor quantity N=2, when During 3 regenerative operation of the normal operation of reactor 2 and reactor, process stream inlet valve 11 is opened, process stream outlet valve 13 Open；Process stream inlet valve 12 is closed, and process stream outlet valve 14 is closed.It is logical from process-stream charging 21 out-of-bounds Cross process stream inlet valve 11 and enter reactor 2 and chemically reacted, raw material is changed into product and gone out by process stream Mouth valve 13 is flowed out, and the process stream of outflow is sent out out-of-bounds as process-stream discharging 23.
Process operation parameter is as follows：Hydrogenation reactor catalyst Pd contents are that 0.10%, Ni contents are 0.80%, and carrier is Aluminium oxide Al2O3, specific surface area 28m2/g；Reaction temperature under nominal situation operator scheme is 77 DEG C, and reaction pressure is 2.3MPaG, gas phase air speed 5100h-1；Regeneration temperature under regeneration regime operator scheme is 195 DEG C, and regeneration pressure is 1.9MPaG。
Pass through the operator scheme one key switching facility 1 of the present invention, it is possible to achieve：
(1) normal operation of reactor 2, the regenerative operation of reactor 3；
(2) normal operation of reactor 3, the regenerative operation of reactor 2；
A key between above-mentioned (1), (2) automatically switches.
Thus, the method to be automatically switched using a key of the invention, two kinds of patterns of nominal situation and regeneration regime are mutually switched During, handoff procedure spends 0.1 second time, and security reliability is good, operating efficiency is high, operation element amount is small.Work after hydrogenation Skill material passes through separation and purification, obtains ethylene contents >=99.95mol%, acetylene content≤2 × 10-6Mol polymer grade ethylene production Product；Propylene content >=99.6mol%, propine content≤5 × 10-6Mol, allene content≤5 × 10-6Mol polymerization-grade propylene Product.
【Embodiment 2】
Together【Embodiment 1】, only production scale be changed to 1,000,000 tons/year of ethylene units, C3 fraction uses back end hydrogenation technique Flow removes propine and allene impurity therein, and parallel reactor quantity N=3, wherein 2 reactor normal operations, 1 anti- Answer device regenerative operation.
Process operation parameter is as follows：BC-L-83 type catalyst Pd contents are used as 0.3%, specific surface area 88m2/ g, carrier For aluminium oxide Al2O3；Reaction temperature under nominal situation operator scheme is 34 DEG C, reaction pressure 2.4MPaG, liquid phase air speed 65h-1；Regeneration temperature under regeneration regime operator scheme is 243 DEG C, regeneration pressure 1.7MPaG.
Pass through the operator scheme one key switching facility of the present invention, it is possible to achieve：
(1) reactor 1 and the normal operation of reactor 2, the regenerative operation of reactor 3；
(2) reactor 1 and the normal operation of reactor 3, the regenerative operation of reactor 2；
(3) reactor 2 and the normal operation of reactor 3, the regenerative operation of reactor 1；
A key between above-mentioned (1), (2), (3) automatically switches.
Thus, the method to be automatically switched using a key of the invention, two kinds of patterns of nominal situation and regeneration regime are mutually switched During, handoff procedure spends 0.1 second time, and security reliability is good, operating efficiency is high, operation element amount is small.Carbon after hydrogenation Three cuts refine by later separation, obtain propylene content >=99.6mol%, propine content≤5 × 10-6Mol, allene content ≤5×10-6Mol polymerization-grade propylene product.
【Embodiment 3】
Together【Embodiment 1】, be only changed to 300,000 tons/year of peroxide passivation expoxy propane HPPO devices of production scale, propylene with Hydrogen peroxide generates expoxy propane by epoxidation reaction, parallel reactor quantity N=4, wherein 3 reactor normal operations, 1 Reactor regenerative operation.
Process operation parameter is as follows：The reaction temperature of reactor is 65 DEG C, reaction pressure 3.2MPaG, and propylene weight is empty Fast 4.6h-1；The regeneration temperature of reactor is 235 DEG C, regeneration pressure 0.9MPaG.
Pass through the operator scheme one key switching facility of the present invention, it is possible to achieve：
(1) reactor 1 and reactor 2 and the normal operation of reactor 3, the regenerative operation of reactor 4；
(2) reactor 1 and reactor 2 and the normal operation of reactor 4, the regenerative operation of reactor 3；
(3) reactor 1 and reactor 3 and the normal operation of reactor 4, the regenerative operation of reactor 2；
(4) reactor 2 and reactor 3 and the normal operation of reactor 4, the regenerative operation of reactor 1；
A key between above-mentioned (1), (2), (3), (4) automatically switches.
Thus, the method to be automatically switched using a key of the invention, two kinds of patterns of nominal situation and regeneration regime are mutually switched During, handoff procedure spends 0.1 second time, and security reliability is good, operating efficiency is high, operation element amount is small.Expoxy propane Selectivity reaches more than 97.0%, and product propylene purity reaches more than 99.95%.
【Embodiment 4】
Together【Embodiment 1】, 2,400,000 tons/year of methanol-to-olefins MTO devices of production scale are only changed to, product gas is used and urged The method for changing hydrogenation removes acetylene impurities therein, and parallel reactor quantity N=4, wherein 3 reactor normal operations, 1 anti- Answer device regenerative operation.
Process operation parameter is as follows：Hydrogenation reactor catalyst Pd contents are that 0.25%, Ni contents are 0.31%, and carrier is Aluminium oxide Al2O3, specific surface area 43m2/ g, pore volume 0.43ml/g；Reaction temperature under nominal situation operator scheme is 43 DEG C, reaction pressure 1.7MPaG, gas phase air speed 3300h-1；Regeneration temperature under regeneration regime operator scheme is 155 DEG C, then Raw pressure is 1.1MPaG.
Pass through the operator scheme one key switching facility of the present invention, it is possible to achieve：
(1) reactor 1 and reactor 2 and the normal operation of reactor 3, the regenerative operation of reactor 4；
(2) reactor 1 and reactor 2 and the normal operation of reactor 4, the regenerative operation of reactor 3；
(3) reactor 1 and reactor 3 and the normal operation of reactor 4, the regenerative operation of reactor 2；
(4) reactor 2 and reactor 3 and the normal operation of reactor 4, the regenerative operation of reactor 1；
A key between above-mentioned (1), (2), (3), (4) automatically switches.
Thus, the method to be automatically switched using a key of the invention, two kinds of patterns of nominal situation and regeneration regime are mutually switched During, handoff procedure spends 0.1 second time, and security reliability is good, operating efficiency is high, operation element amount is small.Work after hydrogenation Skill material passes through separation and purification, obtains ethylene contents >=99.95mol%, acetylene content≤2 × 10-6Mol polymer grade ethylene production Product.
【Embodiment 5】
Together【Embodiment 1】, 1,500,000 tons/year of ethylene units of production scale are only changed to, C-2-fraction uses back end hydrogenation technique Flow removes acetylene impurities therein, parallel reactor quantity N=6, wherein 5 reactor normal operations, 1 reactor regeneration Operation.
Process operation parameter is as follows：Catalyst Pd contents are that 0.18%, Ni contents are 0.77%, and carrier is aluminum oxide Al2O3, specific surface area 37m2/ g, pore volume 0.39ml/g；Reaction temperature under nominal situation operator scheme is 66 DEG C, instead It is 2.1MPaG, gas phase air speed 3900h to answer pressure-1；Regeneration temperature under regeneration regime operator scheme is 182 DEG C, regeneration pressure For 1.7MPaG.
Pass through the operator scheme one key switching facility of the present invention, it is possible to achieve：
(1) reactor 1 and reactor 2 and reactor 3 and reactor 4 and the normal operation of reactor 5, reactor 6 regenerate Operation；
(2) reactor 1 and reactor 2 and reactor 3 and reactor 4 and the normal operation of reactor 6, reactor 5 regenerate Operation；
(3) reactor 1 and reactor 2 and reactor 3 and reactor 5 and the normal operation of reactor 6, reactor 4 regenerate Operation；
(4) reactor 1 and reactor 2 and reactor 4 and reactor 5 and the normal operation of reactor 6, reactor 3 regenerate Operation；
(5) reactor 1 and reactor 3 and reactor 4 and reactor 5 and the normal operation of reactor 6, reactor 2 regenerate Operation；
(6) reactor 2 and reactor 3 and reactor 4 and reactor 5 and the normal operation of reactor 6, reactor 1 regenerate Operation；
A key between above-mentioned (1), (2), (3), (4), (5), (6) automatically switches.
Thus, the method to be automatically switched using a key of the invention, two kinds of patterns of nominal situation and regeneration regime are mutually switched During, handoff procedure spends 0.1 second time, and security reliability is good, operating efficiency is high, operation element amount is small.Carbon after hydrogenation Two cuts pass through separation and purification, obtain ethylene contents >=99.95mol%, acetylene content≤2 × 10-6Mol polymer grade ethylene production Product.

Claims (4)

1. a kind of method that parallel reactor pattern automatically switches, realizes parallel reactor " bringing normally into operation " and " regenerative operation " two One key switching of the kind different operation modes on the active station or auxiliary operation platform of automatic instrument(s), in " bringing normally into operation " pattern When, all interlock protection function normal operations of reactor, fully meet the requirement of protection process equipment；Once switch to " again During raw operation " pattern, the reactor enters regeneration regime interlock protection state, and now original interlock includes following several Mapping mode：(1) reactor outlet temperature interlocking setting value is automatically changed to the protection value of regeneration；(2) it is anti-during regenerative operation Answer the charging of device process stream to stop, while be reactor maloperation charging when preventing regeneration, process stream material inlet valve, go out Material valve will pass through interlock system positive closing；(3) reactor carries out regenerative operation, main technological process under regenerative operation pattern It is still up；(4) when reactor regenerates, it is all can trigger interlockings action of other positions of main technological process indirectly signal it is complete Portion is bypassed and invalid；(5) fault stop signal of the main other reactors of work flow does not interfere with the regeneration behaviour of the reactor yet Make.
2. the method that parallel reactor pattern automatically switches according to claim 1, it is characterised in that nominal situation and regeneration Operating mode switching time is less than or equal to 0.1 second.
3. the method that parallel reactor pattern automatically switches according to claim 1, it is characterised in that the number of tandem reactor Measure N=2~6.
4. the method that parallel reactor pattern automatically switches according to claim 3, it is characterised in that to set N=2 platforms anti- Exemplified by answering device, when reactor (2) normal operation and reactor (3) regenerative operation, process stream inlet valve (11) is opened, work Skill material outlet valve (13) is opened；Process stream inlet valve (12) is closed, and process stream outlet valve (14) is closed；Come from Process-stream charging (21) out-of-bounds enters reactor (2) by process stream inlet valve (11) and chemically reacted, former Material is changed into product and flowed out by process stream outlet valve (13), and the process stream of outflow discharges (23) as process-stream Send out out-of-bounds.
CN201710981348.7A 2017-10-20 2017-10-20 The method that parallel reactor pattern automatically switches Pending CN107721799A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110183557A (en) * 2019-05-10 2019-08-30 中国神华煤制油化工有限公司 The shut-down control method and system of polyethylene device
CN111495293A (en) * 2020-04-22 2020-08-07 杭州和利时自动化有限公司 Automatic switching control method of hydrolysis reactor for ammonia production system

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CN106008128A (en) * 2016-05-25 2016-10-12 上海交通大学 Methanol-to-propylene reaction regeneration system and method
CN106478351A (en) * 2015-08-28 2017-03-08 中国石油化工股份有限公司 Iso-butane and/or the method for dehydrogenating propane

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Publication number Priority date Publication date Assignee Title
CN1281839A (en) * 1999-07-22 2001-01-31 中国石油化工集团公司 Isoalkane and alkylation method of olefine
CN101811921A (en) * 2010-04-01 2010-08-25 中国科学院山西煤炭化学研究所 Continuous process for preparing hydrocarbon products through methanol transformation without standby reactor
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110183557A (en) * 2019-05-10 2019-08-30 中国神华煤制油化工有限公司 The shut-down control method and system of polyethylene device
CN111495293A (en) * 2020-04-22 2020-08-07 杭州和利时自动化有限公司 Automatic switching control method of hydrolysis reactor for ammonia production system

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Application publication date: 20180223