CN110080971A - A kind of gas Qi Fangfa suitable for supercritical carbon dioxide compressibility - Google Patents
A kind of gas Qi Fangfa suitable for supercritical carbon dioxide compressibility Download PDFInfo
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- CN110080971A CN110080971A CN201910278723.0A CN201910278723A CN110080971A CN 110080971 A CN110080971 A CN 110080971A CN 201910278723 A CN201910278723 A CN 201910278723A CN 110080971 A CN110080971 A CN 110080971A
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- carbon dioxide
- compressibility
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
- B08B7/0021—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by liquid gases or supercritical fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
- F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/02—Lubrication
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/06—Cooling; Heating; Prevention of freezing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/02—Stopping, starting, unloading or idling control
- F04B49/022—Stopping, starting, unloading or idling control by means of pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/02—Stopping, starting, unloading or idling control
- F04B49/03—Stopping, starting, unloading or idling control by means of valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/02—Stopping, starting, unloading or idling control
- F04B49/03—Stopping, starting, unloading or idling control by means of valves
- F04B49/035—Bypassing
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses a kind of gas Qi Fangfa suitable for supercritical carbon dioxide compressibility, belong to gas compression technical field, include the following steps: that the gas pressure in system is maintained 0.2-0.5Mpa by the opening and closing for controlling purge valve, and with this condition sequence clean, pre-lubrication and warming-up operation, system pressure is risen into maximum continuous boost stage by stage after warming-up, then is loaded.Supercritical carbon dioxide compressibility of the invention is restarted after carrying out cleaning pre-lubrication under the environment under low pressure of 0.2-0.5Mpa, avoids hyperbaric environment starting motor that the precision component of compressor is caused to wear；It is reasonable to clean duration setting, it is ensured that the scavenging period too long waste starting time is thoroughly avoided while cleaning.
Description
Technical field
The present invention relates to gas compression fields, are suitable for supercritical carbon dioxide compressibility more particularly to one kind
Gas Qi Fangfa.
Background technique
CO2It is a kind of colourless, odorless, tasteless nontoxic gas under usual condition, water can be dissolved in, be in 25 DEG C of solubility
0.144g/100g water, density are about 1.5 times of air.For 100% pure carbon dioxide, when pressure is higher than critical pressure
When (7.38MPa) and temperature are higher than critical-temperature (31.4 DEG C), CO2Supercriticality between gas phase and liquid phase is super to face
The density of boundary's carbon dioxide is very big, and close to the density of liquid, but diffusion coefficient is close to gas；When pressure is higher than critical pressure
(7.38MPa), when temperature is lower than critical-temperature (31.4 DEG C), CO2In dense liquid state, dense liquid carbon dioxide
Corrosivity it is very strong, and with pressure reduction, carbon dioxide volume expansion, temperature will be reduced, pressure reduction amplitude mistake
It is fast then will lead to carbon dioxide temperature and sharply decline, form dry ice.
Supercritical CO2Gas injection compressibility is exactly CO2The core equipment that gas drive is recovered the oil, it is by CO2Gas from it is normally gaseous by
Grade compression, temperature control, make its temperature be higher than critical-temperature, and pressure is higher than critical pressure, reaches critical state, be then injected into underground and mention
High tar productivity.If liquid phase medium enters compressor, there is very big corrosion risk in compressor, and it is equal extremely existing to occur taking blame for others
As, and dry ice formation can then block pipeline, until making frost crack pipe.It is safe and stable based on supercritical carbon dioxide compressibility
Starting be entire compressibility stable operation basis.
The patent of the starting method for Reciprocting piston compressor of Patent No. CN201310228409.4, discloses
The biggish compressor of type is first preheated before activation, is lubricated, and full machine puts into operation and can effectively be promoted again after making adequate preparation
The service life of the key stressed member of compressibility, and the stability of total system can be improved；But whether its cleaning operation
The restrictive condition of execution is pressure of inspiration(Pi) force value, and pressure of inspiration(Pi) directly initiates motor when being higher than setting value, for compression before starting
Pressure environment in system, which is not done, clearly to be limited, and undisclosed clearly setting value parameter, and it is more not to be suitable for supercritical carbon dioxide
The starting of grade compressibility.
Summary of the invention
It is an object of the invention to: in view of the compression requirements of supercritical carbon dioxide gas, the present invention provides a kind of be applicable in
In the high gas Qi Fangfa of the stability of supercritical carbon dioxide compressibility.
The present invention specifically uses following technical scheme to achieve the goals above: one kind being suitable for supercritical carbon dioxide pressure
The gas Qi Fangfa of compression system, it is characterised in that include the following steps:
Step 1: compressor is powered
Control system is controlled, intake valve, purge valve, total exhaust valve, blow valve, bypass cock valve, final stage by-passing valve,
Classification by-passing valve is in closed state；
Step 2: blow valve is opened, gas is discharged from blow valve in system；
Step 3: gas pressure after monitoring purge valve, to determine whether downstream pressure is lower than the pressure setting of cleaning requirement
Value 0.2Mpa~0.5Mpa opens purge valve and carries out tonifying Qi, if be higher than if pressure is lower than 0.2Mpa~0.5Mpa
0.2Mpa~0.5Mpa then closes purge valve, and the gas pressure in supercritical carbon dioxide compressibility is made to maintain 0.2Mpa
~0.5Mpa, and sequence performs the following operation:
(1) synchronous to execute cleaning and pre-lubrication operation, enter after pre-lubrication and executes warming-up operation:
Wherein, cleaning operation includes:
All valve invariant positions are kept, i.e. intake valve, total exhaust valve, bypass cock valve, final stage by-passing valve, classification by-passing valve is equal
It is in close state, blow valve is opened；First time cleaning is carried out, 100-130S is kept；
Bypass cock valve, final stage by-passing valve and classification by-passing valve are opened, second is carried out and cleans, keep 50-70S；
Close blow valve；
Wherein, pre-lubrication operation includes:
Pre-lubrication oil pump and oil heater are opened, the lubricating oil of crankcase is heated, and to each axis of compressor host
Carry out pre-lubrication is held,
Oil temperature temperature and pressure are monitored, reaches setting value required by pre-lubrication, total exhaust valve open to oil temperature and oil pressure
It opens, executes warming-up operation；
(2) warming-up operation
Start motor；
Compressor oil temperature is monitored, is increased to rated temperature required by warming-up to temperature, executes partial circulating operation；
Step 4: partial circulating operation
The opening and closing for controlling purge valve divides three phases that admission pressure is supplemented to maximum continuous boost value, and the first stage mends
It is charged to the one third of admission pressure, second stage is supplemented to 2/3rds of admission pressure, and the phase III is supplemented to air inlet pressure
The rated value of power；
Crankcase temperature is monitored, after rated temperature required by crankcase oils temperature rise to partial circulating, executes load operation；
Step 5: load operation
Intake valve is opened, purge valve, and orderly close-down bypass cock valve, final stage by-passing valve is closed, is closed by descending order
Each classification by-passing valve, pressure at expulsion are stepped up, and compressor carries out normal operating condition.
Preferably, every section of time interval of tonifying Qi is 10S stage by stage in the partial circulating process.
Preferably, cleaning keeps 130S for the first time；Second of cleaning keeps 70S.
Preferably, intake valve is the valve being connected on the total inlet pipe road of supercritical carbon dioxide compressibility, is used for
Ventilation control is carried out to supercritical carbon dioxide compressibility；
Purge valve is that valve in parallel with intake valve on air inlet process pipe is arranged in, for the reducing pressure by regulating flow of air inlet, machine
Air displacement in unit is carried out before group starting；
Total exhaust valve is the valve being connected on the total air escape pipe road of supercritical carbon dioxide compressibility, for finally arranging
Control of the gas to user；Blow valve, bypass cock valve, final stage by-passing valve, classification by-passing valve
Blow valve is the valve for being connected to the outlet side of final stage compressibility of supercritical carbon dioxide compressibility, is gone out
Port connection is to exhausting pipeline, the emptying of the gas for supercritical carbon dioxide compressibility；
Bypass cock valve is the valve for being connected to the outlet side of final stage compressibility of supercritical carbon dioxide compressibility,
Its gas outlet connection is controlled for gas final stage to primary reflux to the inlet end of primary compression system；
Outlet of the final stage by-passing valve exhaust valve also connected with the final stage compressibility of supercritical carbon dioxide compressibility
The valve at end, the inlet end of the supreme one stage of compression system of gas outlet connection, the reflux for gas from final stage to its upper level
Control；
Classification by-passing valve exhaust valve be connected to supercritical carbon dioxide compressibility compressibilities at different levels into
The valve at gas end, the inlet end of the upper level compressibility of the compressibility where the equal connection in gas outlet to them are used for gas
Body carries out reflux control to its upper level from advanced step by step.
For pressurizeing to pre-lubrication oil, oil heater is used to heat lubricating oil pre-lubrication oil pump.
Beneficial effects of the present invention are as follows:
1. the present invention is before cleaning first vented gas in system, avoids Installed System Memory in gas residue, then lead to
Gas pressure in system is maintained 0.2-0.5Mpa by the switch for crossing control purge valve, then carries out cleaning displacement, pre-lubrication, complete
At motor is started after cleaning pre-lubrication, motor starts under environment under low pressure, loads close to zero load, can be to avoid key components and parts wink
Between stress is excessive causes damages, in the process, make repeated attempts discovery for the low voltage starting value of motor, before activation by gas
The gas pressure of compressibility is reduced to 0.2Mpa that can excessively expend the process time, and straight in the environment of pressure is higher than 0.5Mpa
When connecing starting compressor, the precision parts in compressor just will receive impact, therefore maintain 0.2-0.5Mpa's in system
Start motor under pressure, not only effectively protect the precision component of compressor, but also will not excessively expend the starting time；
1. the present invention first cleans main gas tube in cleaning, then opens bypass and carry out clearly to whole system pipeline
It washes, it is ensured that system completes overall gas displacement, neither pressure in elevation system in the environment of stabilizing low voltage before activation, also not
Miscellaneous gas can be remained, and passes through on-site verification, the first scavenging period is maintained at 100-130S, and the second scavenging period is maintained at 50-
70S can avoid the scavenging period too long waste starting time under the premise of ensuring cleaning thoroughly；
2. finding in previous use, lubricating oil quality in low temperature is more sticky, if oil temperature heating it is not in place and
Direct high load cannot play the role of sufficient lubrication, and bearing is easy for causing to wear with compressor crank shaft friction, this
Invention is in pre-lubrication, warming-up, partial circulating process, and the raising of oil temperature and the increase of pressure are synchronous, and the increase of pressure is with oil temperature
It is prerequisite that whether temperature, which reaches setting value, gradually increases admission pressure after oil temperature reaches setting condition, it is ensured that sufficiently profit
It is sliding, stablize starting；
3. by-passing valve is in opening state, and gas is in system inner circulating reflux, pressure in partial circulating operation of the invention
It will not increase suddenly, admission pressure is increased to rated value stage by stage in this case, the case where not increasing considerably load
Lower that admission pressure stabilization is risen to maximum continuous boost value, further ensure that system stablizes starting pressurization；After pressurization again
Bypass bypass is closed step by step, so that compressor is entered normal step by step compression and is vented, and overall process is steady, reliably, effectively increases and is
The stability of system.
Detailed description of the invention
Fig. 1 is the gas flow diagram of supercritical carbon dioxide compressibility of the invention；
Fig. 2 is that gas of the invention opens flow diagram.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.The present invention being usually described and illustrated herein in the accompanying drawings is implemented
The component of example can be arranged and be designed with a variety of different configurations.
Therefore, the detailed description of the embodiment of the present invention provided in the accompanying drawings is not intended to limit below claimed
The scope of the present invention, but be merely representative of selected embodiment of the invention.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without creative efforts belongs to the model that the present invention protects
It encloses.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.In addition, term " the
One ", " second " etc. is only used for distinguishing description, is not understood to indicate or imply relative importance.
In the description of embodiment of the present invention, it should be noted that the orientation of the instructions such as term "inner", "outside", "upper"
Or positional relationship be based on the orientation or positional relationship shown in the drawings or the invention product using when the orientation usually put
Or positional relationship, it is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning
It must have a particular orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
Embodiment 1
Referring to Fig.1, before the gas of description supercritical carbon dioxide compressibility opens method, overcritical dioxy is briefly introduced
Change carbon pressure compression system, including containing the multi-stage compression system being sequentially connected in series from primary to final stage and for controlling every level-one compression cylinder
The air inlet of the temperature control system of gas temperature after compression, primary compression cylinder is connected to total air inlet by ventilation pipe, end
The gas outlet of grade compression cylinder passes through ventilation pipe sequential communication temperature control system and total exhaust outlet, the gas outlet of final stage compression cylinder
It is also communicated with and goes out pneumatic module containing several gas passages, further include By-pass control system, emptying control system and can be by gas
It is back to the air inlet of compression cylinders at different levels step by step from the gas outlet of final stage compression cylinder gently to reduce the stepped voltage regulation of pressure at expulsion
System, out pneumatic module respectively with By-pass control system, emptying control system and stepped voltage regulation system connectivity.Wherein, stepped voltage regulation
System includes final stage by-passing valve, and the inlet end of final stage by-passing valve is connected to pneumatic module out, the outlet side of final stage by-passing valve and final stage
The air inlet of the upper level compression cylinder of compression cylinder is connected to, other the every grade compression cylinder in addition to final stage compression cylinder and primary compression cylinder
A classification by-passing valve is communicated with by reflux line between air inlet and the thereon air inlet of one stage of compression cylinder.By-pass governing
System includes bypass cock valve, and the inlet end of bypass cock valve is connected to pneumatic module out, the outlet side of bypass cock valve and primary
The air inlet of compression cylinder is connected to, and emptying control system includes blow valve and exhausting pipeline, the inlet end of blow valve and out pneumatic module
Connection, the outlet side of blow valve and exhausting pipeline connection；Total air inlet is communicated with air intake control system, and total exhaust outlet is communicated with row
Gas control system, air intake control system include and the concatenated intake valve of total air inlet and the purge valve in parallel with intake valve, exhaust
Control system includes the venting check valve and exhaust valve along discharge directions sequential series in total exhaust outlet.
Wherein, intake valve is for carrying out ventilation control to supercritical carbon dioxide compressibility；Purge valve is for air inlet
Reducing pressure by regulating flow, air displacement in carry out system before system starts；Exhaust valve is for being finally vented to the control of user；Blow valve
Gas outlet connection is to exhausting pipeline, the emptying of the gas for supercritical carbon dioxide compressibility；Bypass cock valve is used for gas
Body is controlled from final stage to primary reflux；Reflux control of the final stage by-passing valve for gas from final stage to its upper level；Each fraction
Grade by-passing valve is used for gas from the advanced control to flow back step by step to its upper level.
As shown in Fig. 2, the present embodiment provides a kind of gas Qi Fangfa suitable for above-mentioned supercritical carbon dioxide compressibility:
Firstly, be powered to compressibility, the control system intervention control (structure of control system and its controller of compressibility
Make as public technology means, repeat no more), at this point, total intake valve, purge valve, total exhaust valve, blow valve, bypass cock valve, end
Grade by-passing valve, classification by-passing valve are in closed state；
Step 2: opening blow valve, and Installed System Memory residual air body can be discharged from blow valve；
Step 3: gas pressure is (namely in the admission line of supercritical carbon dioxide compressibility after monitoring purge valve
Gas pressure), to determine whether downstream pressure is lower than the pressure set points 0.5Mpa of cleaning requirement, if overcritical titanium dioxide
Gas pressure in the admission line of carbon pressure compression system is lower than setting value 0.5Mpa, then opens purge valve, the cleaned valve of gas into
Enter compressibility, to tonifying Qi is carried out in system, when being higher than setting value 0.5Mpa, then close purge valve and stop tonifying Qi, recycled with this,
Maintain the gas pressure in supercritical carbon dioxide compressibility always under the low-pressure state of 0.5Mpa, and sequence carries out
It operates below:
(1) synchronous to execute cleaning and pre-lubrication operation, pre-lubrication, which takes, is longer than cleaning operation, so Yu Qingxi after pre-lubrication
Operation terminates, and warming-up operation is executed after pre-lubrication:
Wherein, cleaning operation includes:
Keep all valve invariant positions, i.e., total intake valve, total exhaust valve, bypass cock valve, final stage by-passing valve, classification by-passing valve
It is in closed state, purge valve changes folding pressure regulation according to system pressure, and blow valve is opened；Gas enters pressure from purge valve
Compression system is discharged from blow valve, replaces to the air in system, system executes first time under the pressure state of 0.5Mpa
Cleaning keeps 150S, then opens bypass cock valve, final stage by-passing valve and classification by-passing valve, executes second and clean, to entire
All pipelines in system carry out air displacement, keep 70S, close blow valve after the completion of cleaning, complete the constant pressure cleaning of system；
At this point, tonifying Qi is opened and closed still according to system pressure in purge valve, and system pressure is maintained because filler can be revealed
0.5Mpa, so far, other each valve position states are as follows: total intake valve, total exhaust valve, blow valve are in close state, bypass cock valve,
Final stage by-passing valve and classification by-passing valve are in the open state；
Pre-lubrication operation is executed while cleaning operation starts, it may be assumed that pre-lubrication oil pump and oil heater are opened, to crankcase
Lubricating oil heated, and pre-lubrication is carried out to each bearing of compressor host, oil temperature oil pressure is stepped up, and monitors oil temperature temperature
And pressure, reach setting value required by pre-lubrication to oil temperature and oil pressure, total exhaust valve opening executes warming-up operation；At this point,
In addition to purge valve is in opening and closing switching tonifying Qi state, other each valve position states are as follows: total intake valve, blow valve are in close state,
Bypass cock valve, final stage by-passing valve, classification by-passing valve and total exhaust valve are in the open state.
After exhaust valve opening, warming-up operation is executed, starts motor, valve invariant position, purge valve is still within opening and closing switching
Tonifying Qi state, gas pressure maintain 0.5Mpa, and compressor load is small, and motor stablizes starting；Meanwhile gas pressure in system
Very low, the not up to value of high pressure gas so gas is not discharged from total exhaust outlet, but is bypassed by bypass cock valve, final stage
Valve, classification by-passing valve reflux, recycle inside compressor；In this process, the oil temperature of compressor crankcase can be stepped up,
Compressor oil temperature is monitored, is increased to 25 degree of rated temperature required by warming-up to temperature, executes partial circulating operation；
When executing partial circulating operation, by controlling the opening and closing of purge valve, promotion supercritical carbon dioxide stage by stage compresses
Gas pressure in supercritical carbon dioxide compressibility is supplemented to required by partial circulating by the gas pressure in system stage by stage
Pressure set points (the admission pressure setting value of the present embodiment is by taking 2Mpa as an example), for stable activation system, in three stages
It is promoted, admission pressure is supplemented to 0.7MPa in 10S by the first stage, and second stage is supplemented to 1.4MPa, third rank in 10S
Section is supplemented to 2.0MPa in 10S.Crankcase temperature is monitored, after rated temperature required by crankcase oils temperature rise to partial circulating,
In order to ensure supercritical carbon dioxide compressibility stablizes starting and does not interfere its phase transformation, it is preferable that crankcase oils temperature rise is extremely
After rated temperature is 38 degree or more, 38 degree of crankcase oil temperature or more, load operation is executed；When load, total intake valve is first opened, is closed
Purge valve, and orderly close-down bypass cock valve, final stage by-passing valve are closed, closes each classification by-passing valve, pressure at expulsion by descending order
It is stepped up, compressor carries out normal operating condition.Pre-lubrication, warming-up, partial circulating operation in, with oil temperature gradually on
It rises, substep gradually increases the load of motor, and the situation for avoiding oil temperature underload high occurs, and each bearing is damaged, with oil temperature liter
High gradually great load, makes compressibility smoothly enter normal operating conditions.
Claims (4)
1. a kind of gas Qi Fangfa suitable for supercritical carbon dioxide compressibility, it is characterised in that include the following steps:
Step 1: compressor is powered
Control system is controlled, intake valve, purge valve, total exhaust valve, blow valve, bypass cock valve, final stage by-passing valve, classification
By-passing valve is in closed state；
Step 2: blow valve is opened, gas is discharged from blow valve in system；
Step 3: gas pressure after monitoring purge valve, to determine whether downstream pressure is lower than the pressure set points of cleaning requirement
0.2Mpa~0.5Mpa opens purge valve and carries out tonifying Qi if pressure is lower than 0.2Mpa~0.5Mpa, if being higher than 0.2Mpa
~0.5Mpa, then close purge valve, make the gas pressure in supercritical carbon dioxide compressibility maintain 0.2Mpa~
0.5Mpa, and sequence performs the following operation:
(1) synchronous to execute cleaning and pre-lubrication operation, enter after pre-lubrication and executes warming-up operation:
Wherein, cleaning operation includes:
All valve invariant positions are kept, i.e. intake valve, total exhaust valve, bypass cock valve, final stage by-passing valve, classification by-passing valve is in
Closed state, blow valve are opened；First time cleaning is carried out, 100-130S is kept；
Bypass cock valve, final stage by-passing valve and classification by-passing valve are opened, second is carried out and cleans, keep 50-70S；
Close blow valve；
Wherein, pre-lubrication operation includes:
Open pre-lubrication oil pump and oil heater, the lubricating oil of crankcase heated, and to each bearing of compressor host into
Row pre-lubrication,
Oil temperature temperature and pressure are monitored, reaches setting value required by pre-lubrication to oil temperature and oil pressure, total exhaust valve opening is held
Row warming-up operation；
(2) warming-up operation
Start motor；
Compressor oil temperature is monitored, is increased to rated temperature required by warming-up to temperature, executes partial circulating operation；
Step 4: partial circulating operation
The opening and closing for controlling purge valve, divides three phases that admission pressure is supplemented to maximum continuous boost value, the first stage is supplemented to
The one third of admission pressure, second stage are supplemented to 2/3rds of admission pressure, and the phase III is supplemented to admission pressure
Rated value；
Crankcase temperature is monitored, after rated temperature required by crankcase oils temperature rise to partial circulating, executes load operation；
Step 5: load operation
Intake valve is opened, purge valve, and orderly close-down bypass cock valve, final stage by-passing valve is closed, closes each point by descending order
Grade by-passing valve, pressure at expulsion are stepped up, and compressor carries out normal operating condition.
2. a kind of gas Qi Fangfa for supercritical carbon dioxide compressibility according to claim 1, it is characterised in that:
Every section of time interval of tonifying Qi is 10S stage by stage in the partial circulating process.
3. a kind of gas Qi Fangfa for supercritical carbon dioxide compressibility according to claim 1, it is characterised in that:
Cleaning keeps 130S for the first time；Second of cleaning keeps 70S.
4. a kind of gas Qi Fangfa for supercritical carbon dioxide compressibility according to claim 1, it is characterised in that:
Intake valve is the valve being connected on the total inlet pipe road of supercritical carbon dioxide compressibility, for overcritical dioxy
Change carbon pressure compression system and carries out ventilation control；
Purge valve is that valve in parallel with intake valve on air inlet process pipe is arranged in, and for the reducing pressure by regulating flow of air inlet, unit is opened
Air displacement in unit is carried out before dynamic；
Total exhaust valve is the valve being connected on the total air escape pipe road of supercritical carbon dioxide compressibility, for be finally vented to
The control of user；Blow valve, bypass cock valve, final stage by-passing valve, classification by-passing valve
Blow valve is the valve for being connected to the outlet side of final stage compressibility of supercritical carbon dioxide compressibility, gas outlet
Connection is to exhausting pipeline, the emptying of the gas for supercritical carbon dioxide compressibility；
Bypass cock valve is the valve for being connected to the outlet side of final stage compressibility of supercritical carbon dioxide compressibility, is gone out
Port connection is controlled for gas final stage to primary reflux to the inlet end of primary compression system；
Outlet side of the final stage by-passing valve exhaust valve also connected with the final stage compressibility of supercritical carbon dioxide compressibility
Valve, the inlet end of the supreme one stage of compression system of gas outlet connection, the reflux control for gas from final stage to its upper level；
Being classified by-passing valve exhaust valve is the inlet end for being connected to the compressibilities at different levels of supercritical carbon dioxide compressibility
Valve, the inlet end of the upper level compressibility of the compressibility where the equal connection in gas outlet to them, for gas from
It is advanced to carry out reflux control step by step to its upper level；
For pressurizeing to pre-lubrication oil, oil heater is used to heat lubricating oil pre-lubrication oil pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910278723.0A CN110080971B (en) | 2019-04-09 | 2019-04-09 | Gas start method suitable for supercritical carbon dioxide compression system |
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Effective date of registration: 20201012 Address after: 100032 Liupuwei, Xicheng District, Beijing Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CNPC JICHAI POWER Co.,Ltd. Address before: 610100 No. 3 Century Avenue, Chengdu economic and Technological Development Zone, Chengdu, Sichuan Patentee before: CNPC JICHAI POWER COMPANY LIMITED CHENGDU COMPRESSOR BRANCH |