CN102889471A - Centralized gas supply station for pipeline special for civil dimethyl ether gas and gas supply method thereof - Google Patents
Centralized gas supply station for pipeline special for civil dimethyl ether gas and gas supply method thereof Download PDFInfo
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- CN102889471A CN102889471A CN2012101601730A CN201210160173A CN102889471A CN 102889471 A CN102889471 A CN 102889471A CN 2012101601730 A CN2012101601730 A CN 2012101601730A CN 201210160173 A CN201210160173 A CN 201210160173A CN 102889471 A CN102889471 A CN 102889471A
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Abstract
The invention relates to a centralized gas supply station for a pipeline special for civil dimethyl ether gas and a gas supply method thereof. The gas supply method comprises the following steps of: conveying liquid dimethyl ether to a gas supply station by a manufacturer through a tank vehicle or a pipeline, storing the liquid dimethyl ether in a storage tank, converting the liquid dimethyl ether into gaseous dimethyl ether through a special gasification process, and conveying the gaseous dimethyl ether to each user through a pressure-resistant seamless steel tube. Due to the adoption of a centralized gasified gas supply mode, great convenience is brought to residents, the energy is saved, the leakage is reduced, and the centralized gas supply station is convenient to manage and safe.
Description
Technical field
The present invention relates to a kind of novel gas pipe special central gas supply station and air supply method thereof, relate in particular to a kind of central gas supply station and air supply method thereof of civilian dimethyl ether fuel gas pipe special.
Background technique
Dimethyl ether (being called for short DME) as a kind of combustion gas, can substitute liquefied petroleum gas (being called for short LPG) and the rock gas take methane as main component (being called for short LNG) take propane as main component fully.Since the molecular characterization of dimethyl ether itself, so that it has than liquefied petroleum gas and the more advantage of rock gas:
One, combustion temperature is high.About 2000 ℃ of the combustion temperature of liquefied petroleum gas, the combustion temperature of dimethyl ether is 2250 ℃, because self contains oxygen dimethyl ether, the burning of formation encapsulation, during burning, required air (oxygen) amount than rear both lack, the required heat of premix heat is also few, therefore actual combustion temperature rear both all exceed more than 200 degree centigrade;
Two, turbidity test are high.Occurring in nature, natural dimethyl ether is few, has that (main component is as CO, H take synthetic gas only
2, a little CH
4) carry out the product of industrialized production, thereby, finished product dimethyl ether non-combustible impurity seldom, and liquefied petroleum gas and rock gas all derive from crustal bathyderm through the Chemical Physics development process in millions upon millions of years, contain more noncombustibles.So dimethyl ether is a kind of fuel with high cleanness (gas);
Three, pressure is lower.The pressure of liquefied petroleum gas in the time of 20 ℃ is 0.81MPa, and the pressure of rock gas in the time of 20 ℃ is 4.6MPa, and the pressure during 20 ℃ of dimethyl ether is 0.54MPa, and therefore, dimethyl ether is safer in storage, transportation, use;
Four, burning is thorough, at the bottom of the no-blacking pan; Five, cost of production is lower, can be accepted by the user; Six, highly versatile, the burner of liquefied petroleum gas or rock gas improves a little, can make the burner of dimethyl ether.
The bottled liquefied petroleum gas of traditional (steel) is made combustion (material) gas and is directly burnt at burner (cooking stove), only has nearly 50 years history, the history of pipe natural gas is then shorter, because development and the dimethyl ether of Coal Chemical Industry have plurality of advantages, dimethyl ether is made combustion (material) gas and has been become focus, trend of the times.
At present, domestic petroleum liquid gas civil pipeline delivery application technical examples is few, and civil natural gas pipe applications technology is in developing stage, and especially civil pipeline dimethyl ether technology still is in the starting stage, and is external also without ripe practical experience.We are in the research to the dimethyl ether fuel gas pipe transportation technology, and are special at gasification process, automatically control the research of detection technique and equipment application facet etc., have done a large amount of basic works.
Summary of the invention
The purpose of this invention is to provide a kind of civilian dimethyl ether fuel gas pipe special central gas supply station and air supply method thereof.
The present invention has adopted following technological scheme to realize above-mentioned purpose:
A kind of civilian dimethyl ether fuel gas pipe special central gas supply station, comprise: the top of storage tank is by gas phase valve access gas phase pipeline, then access user is indoor is in charge of, the storage tank bottom is by liquid phase valve access liquid phase pipeline, and this liquid phase pipeline is divided into the path of two parallel connections, and a path connects compressor or pump by valve, enter storage tank, another path connects automatic control system and vaporizing unit, and then access user is indoor is in charge of, and radiator or heat dissipating pipe are housed in the storage tank.
Wherein, in the middle of described storage tank and compressor or pump, be connected with dashpot.
Wherein, by bypass valve connecting bypass pipe, then access user is indoor is in charge of on described storage tank top.
Wherein, described automatic control system comprises autocontrol valve, inductor, duct thermostat, pressure regulator or flow regulator and the inductor that connects successively, and the temperature rise device is installed in the described vaporizing unit.
Wherein, described gas phase pipeline is divided into gas phase house steward and auxiliary line, and described liquid phase pipeline is divided into liquid phase house steward and auxiliary line; Preferably, liquid phase house steward adopts GB 16Mn seamless steel pipe, and pipeline diameter is at DN50 ~ 300mm; Gas phase house steward adopts GB 16Mn seamless steel pipe, and pipeline diameter is at DN125 ~ 300mm; Auxiliary line adopts GB 16Mn seamless steel pipe, and pipeline diameter is at DN6 ~ 50mm.
The air supply method at a kind of civilian dimethyl ether fuel gas pipe special central gas supply station is that the liquid dimethyl ether is sent to supply station, is stored in the storage tank, adopts gasification process, and liquid dimethyl ether is become gaseous dimethyl, then is transported to each user by pipeline.
Wherein, the described method of sending to comprises: the method by unloading tank car or the method for reseptance of dimethyl ether out-of-bounds, wherein,
The described tank car step of unloading is as follows:
(1) with among the gas phase house steward and liquid phase house steward in the gas phase sebific duct on the tank car and the liquid phase sebific duct difference connecting system,
(2) open first gas valve on the storage tank and the gas valve on the tank car, two gas phase pipes are connected, and open liquid phase inlet valve on the storage tank and the liquid phase valve on the tank car again,
(3) order is opened compressor outlet valve and inlet valve, start,
(4) the liquid dimethyl ether in the tank car enters storage tank through flowmeter,
(5) after complete, order is turned off storage tank gas valve, liquid phase inlet valve, tank car gas valve, tank car liquid phase valve, compressor inlet/outlet valve;
The method of reseptance of described out-of-bounds dimethyl ether refers to manufacturer or other professional gas stations are inputted storage tank for the dimethyl ether that comes by pipeline.
Wherein, described gasification process is selected from any or several combinations in nature gasification, heating gasification, the compressor gasification, wherein,
Described natural gasification is to build some storage tanks, its expansion space total measurement (volume) be 400 ~ 500 times of day gas consumption liquid volume or more than, the air feed of naturally vaporizing, the maintenance ambient temperature is higher than more than the dimethyl ether dew point temperature;
Described heating gasification is that a vaporizing unit that contains thermal insulation layer is set, control liquid dimethyl ether flow velocity, adopt outlet temperature and the control system of flow tandem adjusting or the control system of dimethyl ether gaseous phase outlet temperature and the adjusting of outlet pressure tandem of gaseous dimethyl, keep the gas phase temperature of vaporizing unit at 15 ~ 50 ℃, liquid dimethyl ether is vaporized.
Described compressor gasification is selected from any in the method for compressor pump circulation gasification, centrifugal or vane type oil pump pump circulation gasification, heat pump gasification or start by set date compressor.
Wherein,
Described compressor pump circulation gasification is to use compressor, adopt outlet temperature and the control system of flow tandem adjusting or the control system of dimethyl ether gaseous phase outlet temperature and the adjusting of outlet pressure tandem of gaseous dimethyl, keep storage tank gaseous phase outlet temperature at 15 ~ 50 ℃, liquid dimethyl ether is vaporized.
Described centrifugal or vane type oil pump pump circulation gasification is to use centrifugal or vane type oil pump, adopt outlet temperature and the control system of flow tandem adjusting or the control system of dimethyl ether gaseous phase outlet temperature and the adjusting of outlet pressure tandem of gaseous dimethyl, keep storage tank gaseous phase outlet temperature at 15 ~ 50 ℃, liquid dimethyl ether is vaporized.
Described heat pump gasification is to use heat pump, adopt the control system of gaseous dimethyl outlet temperature and flow tandem adjusting or the control system of dimethyl ether gaseous phase outlet temperature and the adjusting of outlet pressure tandem, keep storage tank gaseous phase outlet temperature at 15 ~ 50 ℃, liquid dimethyl ether is vaporized.
The method of described start by set date compressor, be according to day or the time evaporating capacity, the spatial volume of storage tank, the power of compressor, ask and calculate time and the interlude that needs operation, then calculate day number of times of start, by the control system commander, then i.e. start or shut down.
In addition, the air supply method at this civilian dimethyl ether fuel gas pipe special central gas supply station is taken out residual recovery in addition
Step, tank switching step and the forwarding step of dimethyl ether out-of-bounds.
It is wherein, described that to take out residual recycling step as follows:
The transportation liquid-phase tube of tank car and gas phase pipe are accessed respectively liquid phase house steward and gas phase house steward in this supply station by loose joint, start compressor after opening valve, raffinate in the container enters transportation tank car storage tank by the step of tankage car, then being transported to processing factory reprocesses, wherein, the described container of taking out residual recovery is storage tank or steel cylinder;
The step of described tankage car is selected from any in following two kinds of methods;
Method one:
(1) with the gas phase sebific duct on tank car tank access dashpot, open the compressor tank car tank of finding time, in the tank gas phase through flowmeter, straight-through storage tank;
(2) drive storage tank liquid-phase outlet valve, dimethyl ether liquid enters the tank car tank in the storage tank;
(3) after complete, turn off first the storage tank outlet valve, close again groove tank liquid phase valve, gas valve, compressor pump inlet/outlet valve.
Method two:
Open gas valve on the storage tank and the gas valve on the tank car, two gas phase pipes are connected, by difference of liquid level, the liquid dimethyl ether in the storage tank is pressed into tank car.
In addition, the step of described tank switching is as follows:
(1) opens two storage tank gas valves, connect;
(2) open a storage tank liquid-phase outlet valve, order opens that compressor goes out, inlet valve, starts compressor, and the liquid dimethyl ether flowmeter of flowing through enters storage tank;
(3) or close that another storage tank liquid-phase outlet valve, order open that compressor goes out, inlet valve, storage tank liquid-phase outlet valve, start compressor, the liquid dimethyl ether flowmeter of flowing through enters another storage tank;
(4) complete, close storage tank liquid-phase outlet valve, compressor inlet/outlet valve, another storage tank liquid phase import, two storage tank gas valves.
In addition, out-of-bounds the transmission of dimethyl ether is: holding vessel all is full of in the boundary, tank car tank and steel cylinder have been finished and have been filled and also have under the remaining situation from the dimethyl ether that out-of-bounds comes, and the dimethyl ether that just needs out-of-bounds to come sends to out-of-bounds other users or other professional gas stations.
The present invention adopts above technological scheme, has following advantage:
Concentrate the vaporization plenum system owing to adopting, the central gas supply station of the civilian dimethyl ether fuel gas pipe special of the present invention's design is very easy to the resident, energy saving (the required electric energy of dispersion inflation is 4 times of central gas supply), reduce and leak, be convenient to management, safer.
Description of drawings
Fig. 1 is the technological process schematic overview at the civilian dimethyl ether fuel gas pipe special central gas supply station designed of the present invention;
Fig. 2 is the process flow diagram of nature evaporating method gas transmission;
Fig. 3 is that gas of dimethyl ether outlet temperature and flow tandem are regulated schematic diagram;
Fig. 4 is that gas of dimethyl ether outlet temperature and pressure tandem are regulated schematic diagram;
Fig. 5 is the process flow diagram with the compressor gas transmission;
Fig. 6 is centrifugal or the process flow diagram of vane type oil pump gas transmission;
Fig. 7 is the process flow diagram with the heat pump gas transmission.
Description of reference numerals: 1.-safety valve; 2.-storage tank; 3., 3. '-flowmeter; 4., 4. '-compressor or pump; 5.-pressure gauge; 6.-tank car; 7.-automatic control system; 7./1-separator tube; 7./2-autocontrol valve; 7./3-manually operated valve; 7./4,4 '-inductor; 7./5-duct thermostat; 7./6-flow regulator; The wiring of ⑦ ∕ 7-automatic control system; 7./8-pressure regulator; 8.-vaporizing unit; 9.-thermal insulation layer;
-steel cylinder;
-loose joint;
Indoor minute pipeline of-user;
-dashpot;
-temperature rise device Δ t;
-liquid phase house steward;
-gas phase house steward;
-liquid phase sebific duct;
-gas phase sebific duct;
-out-of-bounds factory or other professional gas stations;
-out-of-bounds other users or other gas stations;
-radiator or heat dissipating pipe;
-bypass tube;
-bypass valve;
-other auxiliary lines; 10 ~ 49-control valve.
Embodiment
Fig. 1 is the technological process schematic overview at the civilian dimethyl ether fuel gas pipe special central gas supply station designed of the present invention, 3. and 3. comprise among the figure: safety valve 1., 2. (I number, II number, III number), flowmeter for storage tank ', compressor or pump 4. and 4. ', pressure gauge 5., tank car 6., 7. (dotted portion: contain autocontrol valve 7./2, inductor of automatic control system
7./4 and 7./4 ', duct thermostat
7./5, flow regulator
7./6, pressure regulator
7./8, the automatic control system wiring is 7./7) and separator tube 7./1, vaporizing unit 8., thermal insulation layer 9., manually operated valve 7./3, steel cylinder
Loose joint
Indoor minute pipeline of user
Dashpot
Temperature rise device Δ t
Liquid phase house steward
Gas phase house steward
The liquid phase sebific duct
The gas phase sebific duct
Radiator or heat dissipating pipe
Bypass tube
Bypass valve
Other auxiliary lines
Control valve 10 ~ 49.
The top of storage tank arranges safety valve, pressure gauge, storage tank top by control valve access gas phase house steward
Storage tank is bottom access liquid phase house steward 2.
The liquid dimethyl ether passes through auxiliary line
4. and 4. enter compressor or pump ', through being provided with pressure gauge liquid phase auxiliary line 5.
3. and 3. flowing through flowmeter ', enter storage tank.Radiator or heat dissipating pipe are housed in the storage tank.
When carrying out the loading or unloading tank car 6. and taking out steel cylinder
Or during the operation of the raffinate of storage tank and tank switching, only need the gas phase sebific duct on the tank car
With the liquid phase sebific duct
By loose joint
Access respectively the gas phase house steward
With the liquid phase house steward
Among or the access dashpot
Rear startup compressor or pump get final product, when heating when vaporization, need to the liquid dimethyl ether from storage tank 2. the bottom emit by automatic control system 7. enter scribble thermal insulation layer vaporizing unit 9. 8. in through the temperature rise device
The heating vaporization is given vent to anger and is flowed to user's pipeline
When adopting the vaporization of compressor or pump (comprising centrifugal or vane type oil pump) and heat pump cycle to supply gas, with radiator or heat dissipating pipe
Heat energy promote the dimethyl ether vaporization among being dispersed into the dimethyl ether of storage tank, all gas dimethyl ether unnecessary after various vaporization modes can be passed through bypass tube
Bypass valve
Return storage tank.
In addition, in the liquid phase auxiliary line, also can add 1m
3Dashpot
Can find time very easily such as tank car tank or storage tank, shorten pipeline, economical with materials.
Wherein, described gas phase house steward adopts international 16Mn seamless steel pipe, and pipeline diameter is selected as required, normally at DN125 ~ 300mm; The user adopts GB 16Mn seamless steel pipe indoor being in charge of, and pipeline diameter is selected as required, normally at DN12 ~ 20mm; Liquid phase house steward adopts GB 16Mn seamless steel pipe, and pipeline diameter is selected as required, normally is DN50 ~ 300mm; The auxiliary line that other do not mark adopts GB 16Mn seamless steel pipe, and pipeline is selected as required, normally is DN6 ~ 50mm.Gas phase and liquid phase sebific duct material all are teflon Ethylene Propylene Terpolymer silicone rubber, the liquid phase sebific duct
Caliber DN30 ~ 100mm, the gas phase sebific duct
Caliber DN20 ~ 80mm.
The air supply method at the civilian dimethyl ether fuel gas pipe special central gas supply station of the present invention's design, that liquid dimethyl ether is sent to supply station by manufacturer by tank car or pipeline, be stored in the storage tank, adopt gasification process, liquid dimethyl ether is become gaseous dimethyl, then be transported to each user by withstand voltage seamless steel pipe.
Now concrete operating procedure is described below:
At first, dimethyl ether can be transported to the gas station by tank car, and then the dimethyl ether in the unloading tank car, make it to enter in the storage tank; Perhaps, can establish separately the station, preferably being stood erectly by other contiguous professional gas connects air feed (the out-of-bounds reception of dimethyl ether).
One, unloads the tank car step
(1) with the gas phase sebific duct on the tank car
With the liquid phase sebific duct
Access respectively the gas phase house steward in this gas station
With the liquid phase house steward
Among;
(2) when using compressor or pump 4., open first the gas valve 36 on gas valve 35 on the tank car tank and the storage tank (I number), two gas phase pipes are connected, open again the liquid phase valve 34,40,25,27 on the tank car, open compressor or pump 4., through flowmeter 3., valve 20, enter storage tank (I number); Or connect valve 37, through valve 16, flowmeter 3. ', valve 19, advance storage tank (II number); Or connect valve 38,39, advance storage tank (III number) through valve 18;
(3) or use compressor or pump 4. ', connect valve 36,35, open (tank car liquid phase) valve 34,40,24,26, drive compressor or pump 4. ', through valve 16, flowmeter 3., valve 20, advance storage tank (I number), or connect valve 37, through flowmeter 3. ', valve 19, advance storage tank (II number), or connect valve 38,39, through valve 18, advance storage tank (III number).
Two, the receiving step of dimethyl ether out-of-bounds
A, from out-of-bounds manufacturer or other professional gas stations
The dimethyl ether that comes advances (I number) storage tank through valve 14,15,20, or through valve 14,12, flowmeter 3., valve 20 advances (I number) storage tank or through valve 14,12,16, flowmeter 3. ', valve 19 advance (II number) storage tank or through valve 14,12,16, flowmeter 3. ', valve 18 advances (III number) storage tank; Or through valve 14,15,13,12,16, flowmeter 3. ', valve 19 advances (II number) storage tank or advances (III number) storage tank through valve 18;
B, from out-of-bounds manufacturer or other professional gas stations
The dimethyl ether that comes through valve 14,15,21,24, compressor or pump 4. ', valve 26, flowmeter 3. ', valve 19, advance (II number) storage tank or advance (III number) storage tank through valve 18; Through valve 14,11,17,28,29,25, compressor or pump 4., valve 27, flowmeter 3., valve 20 advances (I number) storage tank.
Three, concentrate vaporization air feed step
Compressed dimethyl ether is saturation state in storage tank, existing gas phase has again liquid phase.Being become in the process of liquid state by gaseous state, discharge a large amount of heat, and become by liquid state in the process of gaseous state through expenditure and pressure, absorb again a large amount of heat.This part heat (being equivalent in theory) that discharges or absorb, normal title " latent heat of vaporization " (the 466.9KJ/kg when latent heat of vaporization of dimethyl ether is boiling point is scaled 112 kilocalories/kilogram).Throttling expansion, its volume approximately enlarges 400 times, and self drop in temperature, this be because gas molecule is pulling force between overcoming consume in self the part can the result, if energy is not replenished, vaporization just stops, the quantity (amount of liquid phase the more amount of vaporization is larger) of the initial temperature of liquid phase and final temperature poor (temperature difference is larger, and amount of vaporization is larger) and liquid phase when the amount of vaporization of dimethyl ether depends on vaporization.Absorb the natural vaporization mode that heat carries out from environment (such as atmosphere), when running into gas peak or climatic anomaly (such as severe winter), amount of vaporization will be had a strong impact on, and can not satisfy the needs of gas consumption.For keeping certain amount of vaporization, guarantee to stablize normal air feed, will replenish certain energy (heat) to the liquid dimethyl ether and vaporize.
The method of vaporization has multiple, and adoptable method has
1, natural gasification air feed:
So-called naturally vaporization refers to the latent heat of liquid dimethyl ether absorption itself or the vaporescence that carries out from the heat of container wall absorption environment (atmosphere).In when vaporization, gas molecule be the pulling force between overcoming consume in self the part can, the drop in temperature of self simultaneously, if not from makeup energy on every side, vaporization just stops.Nature vaporization mode needs the expansion space of larger volume.Described natural gasification is to build some storage tanks, its expansion space total measurement (volume) be 400 ~ 500 times of day gas consumption liquid volume or more than, the air feed of naturally vaporizing, the maintenance ambient temperature is higher than more than the dimethyl ether dew point temperature.
This gas station is by 10 buildings of small community (six floor), 360 families, and on average each household designs maximum 500 kilograms of gas consumptions (namely 309 cubic metres) of community's day with 1 kilogram of dimethyl ether (amounting to 0.618 cubic metre) every day.Adopt nature vaporization mode air feed, need set up the expansion space and be not less than (steel) storage tank of 400 ~ 500 cubic metres more than three, not too economical, one-time investment is larger, and when ambient temperature is lower than the dimethyl ether dew point, vaporizing just becomes problem.This method is only in the situation that just be used with gas low ebb or discontinuity air feed.See accompanying drawing 2.When the gas phase temperature of dashpot outlet, when 15 ~ 50 ℃ of scopes, control system is not moved, and when gas phase temperature≤15 ℃, gas phase flow rate≤3700ml/s, gas phase is through inductor
Pass to duct thermostat
By
Transmit again flow regulator
Again through inductor
Feed back to autocontrol valve 23 ' feed liquor, operation of heat pump simultaneously, the vaporization air feed, when gaseous phase outlet temperature 〉=50 ℃, during flow 〉=8600ml/s, autocontrol valve stops feed liquor, and heat pump is out of service simultaneously.Remain dashpot gaseous phase outlet temperature at 15 ~ 50 ℃, gas phase flow rate in 3700 ~ 8600ml/s scope.
2, heating gasification air feed:
(1) a 1 ~ 3m is set
3Vaporizing unit, thermal insulation layer adopts thermal insulation coatings, the coating thickness 1 ~ 2mm of the material formulations such as graphite fiber, phenolic resin, lithium bentonite, hydroxymethyl cellulose sodium, anilinomethyl triethoxy-silicane.Daytime air feed, control dimethyl ether (liquid) flow velocity be 20 ~ 50 kilograms/time (5.6 ~ 14.0g/s) enter in the vaporizing unit, the control system that adopts vaporizing unit gaseous phase outlet temperature and (dimethyl ether fuel gas) flow tandem to regulate: enter vaporizing unit with 5.6 ~ 14.0g/s flow when setting the liquid dimethyl ether, heated by the temperature rise device and vaporize, when the gaseous phase outlet temperature greater than 50 ℃ of setting values, gas phase is through inductor
-7./4 pass to duct thermostat
By
Transmit again flow regulator
Again through inductor
-7./4 ' feed back to autocontrol valve and 7./2 stop feed liquor, the vaporization of simultaneously temperature rise device Δ t stopped heating; When gas phase temperature is lower than 15 ℃ of setting values, 7./2 action, the liquid dimethyl ether enters vaporizing unit with 5.6 ~ 14.0g/s flow again, and simultaneously temperature rise device Δ t also begins the heating vaporization.As long as keep the gas phase temperature of vaporizing unit in 15 ~ 50 ℃ of scopes, also just guaranteed evaporating capacity.See accompanying drawing 3.
The advantage of this method be easy and simple to handle, investment is little, but that the ratio between temperature change value and the changes in flow rate value fluctuates is larger.
(2) a 1 ~ 3m is set
3Vaporizing unit, thermal insulation layer adopts thermal insulation coatings, the coating thickness 1 ~ 2mm of the material formulations such as graphite fiber, phenolic resin, lithium bentonite, hydroxymethyl cellulose sodium, anilinomethyl triethoxy-silicane.Night air feed, adopt dimethyl ether (liquid) flow velocity be 5 ~ 10 kilograms/time (1.5 ~ 3.0g/s) enter vaporizing unit, the control system that adopts gas of dimethyl ether outlet temperature and gas of dimethyl ether outlet pressure tandem to regulate, see accompanying drawing 4: 7./2 enter in the vaporizing unit through autocontrol valve with 1.5 ~ 3.0g/s flow velocity when setting the liquid dimethyl ether, vaporized by temperature rise device Δ t heating, produce pressure, when the gaseous phase outlet temperature in setting value (50 ~ 60 ℃) scope, during gaseous phase outlet pressure Wei＞=0.8MPa, gas phase is through inductor
-7./4 pass to duct thermostat
-7./5, by
Transmission of pressure regulator again
-7./8, again through inductor-
7./4 ' feed back to autocontrol valve 7./2, autocontrol valve is autoshutdown 7./2, also stopped heating vaporization of simultaneously temperature rise device Δ t; When the gaseous phase outlet temperature in setting value (25 ~ 15 ℃) scope, during gaseous phase outlet Ya Li＜=0.2MPa, 7./2 autocontrol valve is opened automatically, the liquid dimethyl ether enters vaporizing unit with 1.5 ~ 3.0g/s flow velocity, temperature rise device Δ t also begins the heating vaporization.As long as the gaseous phase outlet temperature that keeps vaporizing unit in 0.2 ~ 0.8MPa scope, has also guaranteed evaporating capacity at 15 ~ 50 ℃, gaseous pressure.
Normal condition, manually operated valve is in normally open, only has when flow and during greater than 0.6 ~ 0.8MPa, just adopts manually operated valve greater than 7000 ~ 8600ml/s or pressure, and gas phase is imported in the storage tank that " empty tank " that be equipped with or pressure is lower than 0.2 ~ 0.6MPa.
3, compressor or pump gasification air feed:
(1) compressor pump circulation vaporization air feed:
See accompanying drawing 5: liquid dimethyl ether advances dashpot through storage tank (III number) outlet valve 23,46,42
4. vaporization enters compressor through 41 ', go out from valve 26, through the liquid phase auxiliary tube
Valve 18 is compressed into radiator or the heat dissipating pipe of storage tank (III number)
In the liquid dimethyl ether of the dissipation of heat that radiator or heat dissipating pipe produce in the storage tank, the liquid dimethyl ether is heated and vaporizes.Because gas dimethyl ether is pressurized in compressor, become liquid, become by gas phase in the process of liquid phase, discharge a large amount of heat (compression work), so that the liquid dimethyl ether in the storage tank, constantly vaporization volatilization produces pressure, promotes gas dimethyl ether by the gas phase house steward
Flow to the user
During to usefulness gas low ebb, too much gas dimethyl ether is passed through bypass tube
Return the inner storage of storage tank (III number).When gas phase temperature 〉=50 in the storage tank (III number) ℃, gaseous pressure 〉=0.8MPa, 7. the automatic control system of design (adopts the control system of gas of dimethyl ether outlet temperature and the adjusting of outlet pressure tandem) and sends instruction, and compressor is 4. ' automatically out of service; When the gas peak drops to setting value (3700ml/s), during 15 ~ 50 ℃ of gaseous phase outlet temperature in the storage tank, gaseous pressure≤0.2MPa, compressor is opened automatically, continues vaporization and supplies gas.Remain 15 ~ 50 ℃ of gas phase temperatures, gaseous pressure 0.2 ~ 0.8MPa scope in the storage tank.Perhaps, adopt the outlet temperature of gaseous dimethyl and the control system that the flow tandem is regulated, keep storage tank gaseous phase outlet temperature at 15 ~ 50 ℃, the gaseous phase outlet flow just can satisfy user's actual demand in 3700 ~ 8600ml/s scope.
Also can adopt the storage tank gas phase directly to advance the method for compressor (seeing the dotted arrow trend in the accompanying drawing 5), the control system that adopts gaseous phase outlet temperature and pressure tandem to regulate keeps the interior gas phase temperature of storage tank at 15 ~ 50 ℃, gaseous pressure 0.2 ~ 0.8MPa.
The heat that this compression work of utilizing compressor discharges and make the method for liquid dimethyl ether vaporization has three obvious advantages: one, energy saving.The needed energy (heat) of vaporizing is in time compensated, and system is not prone to freezing phenomenon, and simultaneously, the heat that compressor discharges can in time distribute, and need not to establish in addition cooling system, and energy obtains effectively scientifically (recovery) and utilizes; Two, flow process is simple, equipment is few, operational system self forms the closed circulation system, stops a leak; Three, automaticity is high, is convenient to management maintenance, and is safe and reliable.
(2) with pump (centrifugal or blade type) circulating vaporization method air feed:
(pump cavity of this pump is the place of liquid dimethyl ether rotating operation to liquid dimethyl ether in the storage tank by centrifugal or vane type oil pump, the cylinder of compressor is the back and forth place of operation of gaseous dimethyl, both internal structures are different), form circulation loop, form the agitaion of eddy current by the fluid (liquid dimethyl ether) self of pump conveying, make it vaporization, promote gas of dimethyl ether and directly flow to user's (seeing accompanying drawing 6) by the gas phase pipe.
By the stirring of pump impeller, liquid dimethyl ether is constantly vaporized, produce pressure, adopt the control system of storage tank gaseous phase outlet temperature and the adjusting of outlet pressure tandem, when gaseous phase outlet temperature 〉=50 ℃, outlet pressure 〉=0.8Mpa, gas phase is through inductor
Pass to duct thermostat
By
Transmission of pressure regulator again
Again through inductor
Feed back to autocontrol valve and stop feed liquor, pump (vaporization) out of service simultaneously, when gaseous phase outlet temperature≤15 ℃, outlet pressure≤0.2Mpa, autocontrol valve begins feed liquor, and pump brings into operation and continues the air feed of vaporizing simultaneously.Keep the gaseous phase outlet temperature at 15 ~ 50 ℃, outlet pressure in 0.2 ~ 0.8MPa scope; Perhaps, adopt the outlet temperature of gaseous dimethyl and the control system that the flow tandem is regulated, keep storage tank gaseous phase outlet temperature at 15 ~ 50 ℃, the gaseous phase outlet flow can satisfy user's actual demand (needing the data area of open flow).The gaseous phase outlet flow just can satisfy user's actual demand in 3700 ~ 8600ml/s scope.
This mode is applicable to the little small community of gas consumption.
(3) with heat pump gasification air feed:
This pump structure feature, so that it has the dual functions of pressurized gas and conveying liquid, the liquid dimethyl ether out enters heat pump in storage tank, through the effect of pump internals (structure), the compressed dimethyl ether with another part liquid state of the dimethyl ether of a part of gaseous state is got back in the storage tank from the heat pump outlet.Pipeline between pump discharge and the storage tank is unsuitable long, avoids the energy loss in the process, selects 8 ~ 10 meters.During operation of heat pump, dimethyl ether pressurized and heat release, the liquid dimethyl ether in the heat transferred storage tank and vaporizing, produce pressure, adopt the control system of storage tank gaseous phase outlet temperature and the adjusting of outlet pressure tandem, when gaseous phase outlet temperature 〉=50 ℃, outlet pressure 〉=0.8Mpa, gas phase is through inductor
Pass to duct thermostat
By
Pass to again pressure regulator
Again through inductor
Feed back to autocontrol valve and stop feed liquor, while heat pump (heat production) out of service, when gaseous phase outlet temperature≤15 ℃, outlet pressure≤0.2Mpa, autocontrol valve begins feed liquor, heat pump (heat production) vaporization air feed that brings into operation, remain the gaseous phase outlet temperature at 15 ~ 50 ℃, outlet pressure in 0.2 ~ 0.8Mpa scope;
The control system that adopts storage tank gaseous phase outlet temperature and outlet pressure tandem to regulate, maintenance gaseous phase outlet temperature at 15 ~ 50 ℃, outlet pressure in 0.2 ~ 0.8MPa scope; Perhaps, adopt the outlet temperature of gaseous dimethyl and the control system that the flow tandem is regulated, keep storage tank gaseous phase outlet temperature at 15 ~ 50 ℃, the gaseous phase outlet flow can satisfy user's actual demand in 3700 ~ 8600ml/s scope.(seeing accompanying drawing 7)
During operation of heat pump, working medium (dimethyl ether) is alternately expanded and is compressed, and what temperature occur to reduce and raise alternately changes, and (vaporization) the required energy that expands is lower than the energy of compression generation, and therefore, energy can accumulate in the process, for the dimethyl ether vaporization.This method is comprehensive utilization heat energy and energy-conservation technological means.
(4) method of start by set date compressor or pump vaporization air feed:
The design principle of this method; be exactly the power according to spatial volume, compressor or the pump of (day or time) evaporating capacity, holding vessel, ask and calculate time and the interlude that needs operation, then calculate day number of times of start (pump); by the control system commander, then i.e. start or shutdown.This mode to relatively poor with moving larger its adaptive capacity of occasion of wave, when the gas consumption setting value departs from actual gas consumption when far away, heat (merit) will occur and can compensate untimely or cause hot (merit) loss of energy of part, waste.
In addition, following operating procedure can also be carried out in civilian dimethyl ether fuel gas pipe special central gas supply of the present invention station:
Four, take out residual (recovery) step
The container (steel cylinder or storage tank etc.) of long-term splendid attire dimethyl ether is inner, can produce a certain amount of " raffinate " through long-term accumulation, contain the effective components such as methyl alcohol, dimethyl ether (existing with the form that is dissolved in the moisture) in the raffinate, must reclaim to recycle, this reclaimer operation is " taking out residual ".Taking out residual step is like this: with the liquid phase sebific duct of container (such as tank car or steel cylinder)
With the gas phase sebific duct
By loose joint
Liquid phase house steward in the difference connecting system
With the gas phase house steward
Order opens valve 36,35,34,40,25,27, open compressor or pump 4., through flowmeter 3., valve 20, raffinate in the tank car is drawn into (I number) storage tank, or through valve 16, flowmeter 3. ', valve 19 is drawn into (II number) storage tank, reach certain storage, then in storage tank, emit, be transported to processing factory and process again.
Wherein, in storage tank, emit the dimethyl ether raffinate, the step of its tank car of packing into be selected from following two kinds of methods any:
Method one:
(1) with the gas phase sebific duct on the tank car
The access dashpot
The liquid phase sebific duct
Access the liquid phase house steward in this gas station
Among (by valve 40);
(2) order open valve 35,25,27, open compressor or pump 4. (the tank car tank of finding time), through flowmeter 3., valve 20,22,40,34 advances the tank car tank; Or through valve 16, flowmeter 3. ', valve 19,10,40,34, advance the tank car tank; Or through valve 18,23,40,34, advance the tank car tank;
(3) or with compressor or pump 4. ', order is opened valve 35,41,16, is driven compressor or pump 4. ' (the tank car tank of finding time), through valve 16, flowmeter 3., valve 20,22,40,34, advance the tank car tank; Or through flowmeter 3. ', valve 19,10,40,34, advance the tank car tank; Or advance the tank car tank through valve 18,23,40,34.
(4) after complete, turn off first the storage tank outlet valve, close again groove tank liquid phase valve, gas valve, compressor inlet/outlet valve.
Method two:
Open gas valve on the storage tank and the gas valve on the tank car, two gas phase pipes are connected, by difference of liquid level, " raffinate " in the storage tank is pressed into tank car.Though this method is saved some more electric energy, flow velocity is slower, and loading time is long.
Five, tank switching step
Maybe need maintenance when going wrong among the storage tank in the gas station or when safeguarding, just must pour " problem storage tank " inner dimethyl ether into other storage tank, so gas station domestic demand is equipped with one or above " slack tank ", in case unexpected accidental event.
The step of tank switching is as follows:
(1) the gas phase house steward accesses dashpot
Open valve 36,25,27, drive compressor or pump 4., through valve 16, flowmeter 3. ', valve 19,
22, dimethyl ether that will (II number) storage tank is poured storage tank (I number) into; ', through the flowmeter 3. ' valve 19 of or driving compressor or pump 4.,
22, pour storage tank (I number) into;
(2) the gas phase house steward accesses dashpot
Open valve 37,25,27, open compressor or pump 4., through flowmeter 3., valve 20,22,
Dimethyl ether on will (I number) storage tank is poured storage tank (II number) into; Or drive compressor or pump 4. ' through valve 16, flowmeter 3., valve 20,22,
Dimethyl ether that will (I number) storage tank is poured storage tank (II number) into;
(3) use the method, drive compressor or pump 4. or 4. ' dimethyl ether of (I number) storage tank or (II number) storage tank can be poured into storage tank (III number).Very convenient, flexible.
Six, the out-of-bounds transmission of dimethyl ether
In addition, holding vessel all is full of in the boundary, and tank car tank and steel cylinder have been finished and filled and also have under the remaining situation from the dimethyl ether that out-of-bounds comes, and just needing will be out-of-bounds
The dimethyl ether that comes sends to out-of-bounds other users or other professional gas stations
Can be undertaken by following operating procedure: from out-of-bounds
The dimethyl ether that comes through valve 14,15,21,24, compressor or pump 4. ', valve 26, flowmeter 3. ', valve 17,32,34, enter tank car; Or fill bottle through valve 31; Or go to out-of-bounds other users or other professional gas stations through valve 28,33
Embodiment:
There are 10 buildings (6 floor) in the little community in the glad garden of Hebi City, totally 480 families, and the dimethyl ether that BMW group produces is moved supply station (apart from about 1500 meters of communities) to the groove tank car, and being stood erectly by gas by above-mentioned process step connects central gas supply.Wherein, the gas phase house steward in the supply station adopts GB 16Mn seamless steel pipe, DN130mm, liquid phase house steward adopts GB 16Mn seamless steel pipe, DN80mm, and the user adopts GB 16Mn seamless steel pipe indoor being in charge of, DN16mm, auxiliary line adopt GB 16Mn seamless steel pipe, DN50mm; The liquid phase sebific duct adopts teflon Ethylene Propylene Terpolymer silicone rubber, DN80mm; The gas phase sebific duct adopts teflon Ethylene Propylene Terpolymer silicone rubber, DN30mm.
This supply station has adopted the combination of natural gasification, compressor pump circulation gasification, heat pump gasification.Technological process is as described below:
(1) natural gasification technological process:
This gas station arranges 500m
33 of storage tanks.
The liquid dimethyl ether from storage tank emit with 10 kilograms/time (3g/s) flow velocity enter in the dashpot, the robot control system(RCS) that adopts gaseous phase outlet temperature and rate of discharge to regulate after naturally vaporizing, is transported to user from the dashpot derivation by the gas phase house steward with gas phase.Keep the gaseous phase outlet temperature at 15 ~ 50 ℃, rate of discharge in 1000 ~ 2000ml/s scope.
(2) compressor pump circulation gasification technological process:
Adopting power is the compressor of 4.5KW, and heat diffusion area is 2m
3Radiator or heat dissipating pipe, the robot control system(RCS) that adopts dimethyl ether gaseous phase outlet temperature and outlet pressure tandem to regulate, maintenance gaseous phase outlet temperature at 15 ~ 50 ℃, gaseous phase outlet pressure in 0.2 ~ 0.8MPa scope.
(3) heat pump gasification process flow process:
Adopting power is the heat pump of 2.8kw, the robot control system(RCS) that adopts dimethyl ether gaseous phase outlet temperature and pressure tandem to regulate, maintenance gaseous phase outlet temperature at 15 ~ 50 ℃, gaseous phase outlet pressure in 0.2 ~ 0.8MPa scope.
The specific works method is: the gas station daily schedule: from 6: 00 mornings to evening 22: 00, and compressor pump circulation vaporization air feed; Adopted heat pump gasification air feed from 22: 00 to 0: 00 evening; 6: 00 employing nature gasification air feed from 0: 00 to next day.
The central gas supply station of the civilian dimethyl ether fuel gas pipe special of the present invention design, operation one year over, air feed is stable normal, firmly gets resident's favorable comment and likes.
Above embodiment only is exemplary, scope of the present invention is not consisted of any restriction.It will be understood by those skilled in the art that lower without departing from the spirit and scope of the present invention and can make amendment or replace the details of technical solution of the present invention and form, but these modifications and replacing all fall within the scope of protection of the present invention.
Claims (10)
1. civilian dimethyl ether fuel gas pipe special central gas supply station, comprise: the top of storage tank is by gas phase valve access gas phase pipeline, then access user is indoor is in charge of, the storage tank bottom is by liquid phase valve access liquid phase pipeline, and this liquid phase pipeline is divided into the path of two parallel connections, and a path connects compressor or pump by valve, enter storage tank, another path connects automatic control system and vaporizing unit, and then access user is indoor is in charge of, and radiator or heat dissipating pipe are housed in the storage tank.
2. civilian dimethyl ether fuel gas pipe special central gas supply according to claim 1 station is characterized in that, is connected with dashpot in the middle of described storage tank and compressor or pump.
3. civilian dimethyl ether fuel gas pipe special central gas supply according to claim 1 station is characterized in that, by bypass valve connecting bypass pipe, then access user is indoor is in charge of on described storage tank top.
4. civilian dimethyl ether fuel gas pipe special central gas supply according to claim 1 station, it is characterized in that, described automatic control system comprises autocontrol valve, inductor, duct thermostat, pressure regulator or flow regulator and the inductor that connects successively; The temperature rise device is installed in the described vaporizing unit.
5. civilian dimethyl ether fuel gas pipe special central gas supply according to claim 1 station is characterized in that, described gas phase pipeline is divided into gas phase house steward and auxiliary line, and described liquid phase pipeline is divided into liquid phase house steward and auxiliary line; Preferably, liquid phase house steward adopts GB 16Mn seamless steel pipe, and pipeline diameter is at DN50 ~ 300mm; Gas phase house steward adopts GB 16Mn seamless steel pipe, and pipeline diameter is at DN125 ~ 300mm; Auxiliary line adopts GB 16Mn seamless steel pipe, and pipeline diameter is at DN6 ~ 50mm.
6. air supply method at described civilian dimethyl ether fuel gas pipe special central gas supply station according to claim 1 ~ 5, it is characterized in that, the liquid dimethyl ether is sent to supply station, be stored in the storage tank, adopt gasification process, liquid dimethyl ether is become gaseous dimethyl, then be transported to each user by pipeline.
7. the air supply method at a civilian dimethyl ether fuel gas pipe special central gas supply according to claim 6 station is characterized in that, the described method of sending to comprises: the method by unloading tank car or the method for reseptance of dimethyl ether out-of-bounds, wherein,
The described tank car step of unloading is as follows:
(1) with among the gas phase house steward and liquid phase house steward in the gas phase sebific duct on the tank car and the liquid phase sebific duct difference connecting system,
(2) open first gas valve on the storage tank and the gas valve on the tank car, two gas phase pipes are connected, and open liquid phase inlet valve on the storage tank and the liquid phase valve on the tank car again,
(3) order is opened compressor outlet valve and inlet valve, start,
(4) the liquid dimethyl ether in the tank car enters storage tank through flowmeter,
(5) after complete, order is turned off storage tank gas valve, liquid phase inlet valve, tank car gas valve, tank car liquid phase valve, compressor inlet/outlet valve;
The method of reseptance of described out-of-bounds dimethyl ether refers to manufacturer or other professional gas stations are inputted storage tank for the dimethyl ether that comes by pipeline.
8. the air supply method at a civilian dimethyl ether fuel gas pipe special central gas supply according to claim 6 station is characterized in that, described gasification process is selected from any or several combinations in nature gasification, heating gasification, the compressor gasification, wherein,
Described natural gasification is to build some storage tanks, its expansion space total measurement (volume) be 400 ~ 500 times of day gas consumption liquid volume or more than, the air feed of naturally vaporizing, the maintenance ambient temperature is higher than more than the dimethyl ether dew point temperature;
Described heating gasification is that a vaporizing unit that contains thermal insulation layer is set, control liquid dimethyl ether flow velocity, adopt outlet temperature and the control system of flow tandem adjusting or the control system of dimethyl ether gaseous phase outlet temperature and the adjusting of outlet pressure tandem of gaseous dimethyl, keep the gas phase temperature of vaporizing unit at 15 ~ 50 ℃, liquid dimethyl ether is vaporized.
Described compressor gasification is selected from any in the method for compressor pump circulation gasification, centrifugal or vane type oil pump pump circulation gasification, heat pump gasification or start by set date compressor.
9. the air supply method at a civilian dimethyl ether fuel gas pipe special central gas supply according to claim 8 station is characterized in that,
Described compressor pump circulation gasification is to use compressor, adopt outlet temperature and the control system of flow tandem adjusting or the control system of dimethyl ether gaseous phase outlet temperature and the adjusting of outlet pressure tandem of gaseous dimethyl, keep storage tank gaseous phase outlet temperature at 15 ~ 50 ℃, liquid dimethyl ether is vaporized.
Described centrifugal or vane type oil pump pump circulation gasification is to use centrifugal or vane type oil pump, adopt outlet temperature and the control system of flow tandem adjusting or the control system of dimethyl ether gaseous phase outlet temperature and the adjusting of outlet pressure tandem of gaseous dimethyl, keep storage tank gaseous phase outlet temperature at 15 ~ 50 ℃, liquid dimethyl ether is vaporized.
Described heat pump gasification is to use heat pump, adopt the control system of gaseous dimethyl outlet temperature and flow tandem adjusting or the control system of dimethyl ether gaseous phase outlet temperature and the adjusting of outlet pressure tandem, keep storage tank gaseous phase outlet temperature at 15 ~ 50 ℃, liquid dimethyl ether is vaporized.
The method of described start by set date compressor, be according to day or the time evaporating capacity, the spatial volume of storage tank, the power of compressor, ask and calculate time and the interlude that needs operation, then calculate day number of times of start, by the control system commander, then i.e. start or shut down.
One kind according to claim 5 ~ 9 in the air supply method at each described civilian dimethyl ether fuel gas pipe special central gas supply station, it is characterized in that, take out in addition residual recycling step, tank switching step and the forwarding step of dimethyl ether out-of-bounds.
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| CN201210160173.0A CN102889471B (en) | 2012-05-22 | 2012-05-22 | Centralized gas supply station for pipeline special for civil dimethyl ether gas and gas supply method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103994321A (en) * | 2014-05-26 | 2014-08-20 | 北京金凯威通用机械有限公司 | Filler leakage protection gas distribution station of reciprocating piston type compressor |
| CN103990426A (en) * | 2014-05-14 | 2014-08-20 | 宁波弘景环保科技有限公司 | Nitrogen-seal protection system |
| CN104595722A (en) * | 2014-12-30 | 2015-05-06 | 成都烃源科技有限责任公司 | DME (Dimethyl Ether) normal-temperature-modification transporting process for thick oil |
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| CN104595722A (en) * | 2014-12-30 | 2015-05-06 | 成都烃源科技有限责任公司 | DME (Dimethyl Ether) normal-temperature-modification transporting process for thick oil |
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| CN102889471B (en) | 2015-03-18 |
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