CN106083526B - Ethyl alcohol recycles the system and method for automation control - Google Patents
Ethyl alcohol recycles the system and method for automation control Download PDFInfo
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- CN106083526B CN106083526B CN201610387066.XA CN201610387066A CN106083526B CN 106083526 B CN106083526 B CN 106083526B CN 201610387066 A CN201610387066 A CN 201610387066A CN 106083526 B CN106083526 B CN 106083526B
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
- C07C29/74—Separation; Purification; Use of additives, e.g. for stabilisation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/42—Regulation; Control
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
- C07C29/74—Separation; Purification; Use of additives, e.g. for stabilisation
- C07C29/76—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment
- C07C29/80—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment by distillation
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- Chemical Kinetics & Catalysis (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention discloses the system and methods of ethyl alcohol recycling automation control, the outlet of ethyl alcohol waste liquid pretreatment system is connected with the entrance of ethyl alcohol recovery system, flowmeter is set in connecting pipe, preheater in the connecting pipe of ethanol distillation tower with setting pneumatic control valve, ethanol distillation tower bottom sets alcohol outlet, a part of alcohol enters reboiler and returns ethanol distillation tower, a part enters vapour liquid separator by blowdown pneumatic operated valve, after into vapor-liquid separation, steam returns to ethanol distillation tower, liquid is discharged, the steam that ethanol distillation tower comes out, which enters after preheater hot exchanges, to be entered back into condenser system and is condensed, the qualified alcohol liquid of discharge is collected after finished product cooler.The method of the ethyl alcohol recycling automation control of the present invention is to filter out to be distilled to recover into recovery system after sediment using filter plate frame after waste ethanol coarse-grain mother liquor is neutralized.It is energy-saving present invention optimizes the device and method of alcohol recycle automation control, sewage discharge is reduced, improves distillation yield.
Description
Technical field
The invention belongs to ethyl alcohol recycling fields, are related to the system and method for ethyl alcohol recycling automation control.
Background technology
Ethyl alcohol recovery tower operation principle：It is less than the principle of other solution boiling points using ethyl alcohol boiling point, is boiled with a little higher than ethyl alcohol
The temperature of point, heating volatilization is carried out by the Diluted Alcohol solution that need to be recycled, and after tower body rectifying, straight alcohol gas is precipitated, improves second
The concentration of alcoholic solution achievees the purpose that recycle ethyl alcohol.
With the promotion of energy cost, cost of labor, the increase of environmental protection pressure, energy-saving, personnel reduction and enlargement improve product
Yield reduces the theme that production cost is each interprise's intensive management.Ethyl alcohol recycling is that energy consumption is big, the production more than blowdown flow rate
Unit, it is therefore necessary to do technological innovation and process optimization in terms of ethyl alcohol recycling.
CN201310265012.2《A kind of alcohol steam recovery device》A kind of alcohol recovering device is disclosed, including recycling
Unit.The recovery unit includes one and is equipped with feed inlet, the recovery tower of waste liquid outlet and steam (vapor) outlet and equipped with discharge port
Condenser, the steam (vapor) outlet of the recovery tower are connect by recovery tube with condenser, including at least 2 grades of recovery units, wherein on
The waste liquid outlet of grade recovery tower is connect with the feed inlet of subordinate's recovery tower；Ethyl alcohol biography is equipped on the waste liquid outlet of each recovery tower
Sensor；Ethanol sensor is connect with the input terminal of a controller, be also equipped on the waste liquid outlet of each recovery tower solenoid valve,
Solenoid valve is connect with the output terminal of the controller, and alcohol vapour condensed water makes by the heating of at least 2 grades recovery towers in waste liquid
Ethanol content is less than 2%, reduces the waste of ethyl alcohol.The shortcomings that invention is the heating of at least 2 grades of recovery towers, the equipment of input into
This height, energy-output ratio is big, while has 2% ethyl alcohol in waste liquid, does not accomplish zero-emission, and ethanol recovery is low.
CN201110379162.7《Automatic alcohol recycling system》It discloses to solve existing for existing ethyl alcohol recovery system
A kind of alcohol for the problems such as whole process manually operates, and labor intensity is high, heavy workload, and the work period is long recycles automatically
System is set up in parallel by multiple waste ethanol storage tanks, and the outlet of each waste ethanol storage tank is connect with preheater, is set in connecting pipe
First feed pump and charging regulating valve, the outlet of preheater is connected with the waste ethanol entrance of ethyl alcohol recovery tower；Ethyl alcohol recovery tower bottom
Portion is provided with Diluted Alcohol outlet, and reboiler of connecting between Diluted Alcohol outlet and entrance, and preheater is provided with waste water discharge
Mouthful；The tower top of ethyl alcohol recovery tower is provided with alcohol vapour outlet, the first overhead condenser of connecting on chilled(cooling) water return (CWR), condenser row
The ethyl alcohol part gone out flows back blowback ethyl alcohol recovery tower through return tank first, and another part is cold through removing cost ethyl alcohol regulating valve finished product
Condenser enters finished product ethanol storage tank.The advantages of invention, is the reduction of manual operation, and shortcoming is that not solve energy consumption big, is steamed
Evaporate the problem of yield is low.
Invention content
In view of this, the purpose of the present invention is to provide a kind of system and method for ethyl alcohol recycling automation control, optimizations
Ethyl alcohol recycles automation control technique, energy-saving, reduces sewage discharge, improves distillation yield.In order to realize foregoing invention mesh
, the present invention uses following technical scheme：
The system that ethyl alcohol recycles automation control, including ethyl alcohol waste liquid pretreatment system and ethyl alcohol recovery system, the second
The outlet of alcohol waste liquid pretreatment system is connected with the entrance of ethyl alcohol recovery system.
Further, the ethyl alcohol recovery system includes reboiler, ethanol distillation tower, preheater, vapour liquid separator, condensed system
System, finished product cooler；The liquid outlet of the preheater is connected by the liquid inlet of pipeline with ethanol distillation tower, the ethyl alcohol
The steam (vapor) outlet of destilling tower is connected with the steam inlet of preheater, the steam (vapor) outlet of preheater and the steam inlet phase of condenser system
Even, the preheater and the condensate outlet of condenser system are connected with the entrance of finished product cooler；The ethanol distillation tower bottom
Ethyl alcohol outlet A and outlet B, the outlet A is set to be connected with the liquid inlet of reboiler, the outlet of reboiler and ethyl alcohol
The boiling ethanol entrance port of destilling tower is connected, and the outlet B is connected with the liquid inlet of vapour liquid separator, the vapour liquid separator
Steam outlet be connected with the steam entrance of ethanol distillation tower.
Further, the condenser system includes the first condenser, the second condenser, third condenser, first condensation
The steam (vapor) outlet of device is connected with the steam inlet of the second condenser, the steam of the steam (vapor) outlet of the second condenser and third condenser
Entrance is connected.
Further, the ethanol liquid conveyance conduit being connect with preheater is equipped with flowmeter, connects preheater and ethyl alcohol steams
The liquid conducting pipes for evaporating tower are equipped with charging pneumatic operated valve, and the steam lead road of reboiler is equipped with steam into vapour pneumatic operated valve, row
The connecting pipe for exporting B and vapour liquid separator is equipped with blowdown pneumatic operated valve.
Further, the ethyl alcohol waste liquid pretreatment system includes neutralizing tank, liquid caustic soda measuring tank, filtering sheet frame, waste ethanol storage
Tank, the discharge port of the liquid caustic soda measuring tank are connected with the feeding mouth of neutralizing tank, discharge port and the filtering sheet frame of the neutralizing tank
Feeding mouth is connected, and the discharge port of the filtering sheet frame is connected with the feed liquid refluxing opening of neutralizing tank, and return valve is set in connecting pipe,
The filter plate outlines material mouth and is also connected with waste ethanol reservoir inlet.
Further, the ethyl alcohol recovery system further includes the liquid outlet of return tank, the preheater and the first condenser
It is connected with the entrance of return tank, the outlet of return tank is connected by pipeline with the alcohol reflux mouth of ethanol distillation tower.
The method that ethyl alcohol recycles automation control：Second is entered back into after first waste ethanol is pre-processed in pretreatment system
Alcohol recovery system is distilled to recover.
Further, the pretreatment is after waste ethanol coarse-grain mother liquor is neutralized, sediment is filtered out using filter plate frame；
In the N-process, waste liquid temperature control is in 40~50 DEG C, waste liquor PH of the wine degree control after 0%~50%vol, neutralization
6.7~7.2.
Further, the distillation recovery process is：Steam enters ethanol distillation tower by reboiler and carries out tower body preheating, together
When control steam pressure, after treating tower body preheating, open condenser system, waste ethanol liquid after pretreatment passes through preheater
It is distilled, while control fluid flow into ethanol distillation tower after preheating, and the temperature and ethyl alcohol of adjusting control condenser system
Each section of temperature of destilling tower, the preheated device of steam distilled out from ethanol distillation tower carry out heat exchange, then cold by condenser system
It is solidifying, finished product cooling and recycling are finally carried out, an ethanol liquid part for ethanol distillation tower bottom after reboiler by returning to ethyl alcohol
Destilling tower, a part in the form of steam by returning to ethanol distillation tower after vapour liquid separator.
Further, in the distillation process, Steam pressure control is in 0.04~0.05Mpa, and the voltage-controlled system of destilling tower is 0.02
~0.05MPa, waste ethanol flow control is in 3.5~5.0m3/ h, the control of destilling tower column bottom temperature is at 104~110 DEG C, tower medium temperature
Degree control is at 80~95 DEG C, and at 75~77 DEG C, the control of the first condenser temperature is condensed in 65~75 DEG C, second for tower top temperature control
The control of device temperature at 40~60 DEG C, the control of third condenser temperature at 34 DEG C hereinafter, the voltage-controlled system of destilling tower 0.02~
0.05MPa。
The beneficial effects of the present invention are：
(1) it (is not to be directly entered condensation that the steam at the top of destilling tower out, which is introduced into preheater to enter back into condenser,
Device)：The temperature of alcohol vapour is 75-77 DEG C at the top of recovery tower, is carried out by preheater and temperature for 40-50 DEG C of light ethanol
Heat exchange improves the temperature that light ethanol enters recovery tower, can save steam.
(2) destilling tower lower part setting reboiler：The steam of boiler is made not to be in direct contact with bottom of towe waste liquid, i.e. indirectly heat
Mode, reduce the discharge of waste water in this way, and Boiler Steam can be made to become the high-temperature water recycling boiler profit after condensed water
With saving coal.
(3) after the preprocessed system processing of ethyl alcohol waste liquid is up to standard, Distallation systm is entered back into：By acid-base accommodation pH value into
Property, such ethyl alcohol waste liquid will not corrode destilling tower after entering destilling tower, sediment is filtered out by plate and frame filter press, can avoid blocking up
Delivery pump and column plate are filled in, keeps the temperature of ethyl alcohol waste liquid and wine degree constant, it is ensured that distillation process stabilization does not fluctuate, and can improve steaming
Yield is evaporated, reduces energy consumption.
(4) blowdown valve uses pneumatic control valve, automatically controls：Temperature can be automatically closed when being less than 104 DEG C, make in soiling solution
Ethanol content is zero, substantially increases distillation yield.
(5) steam inlet valve uses pneumatic control valve, automatically controls：It can stablize the steam pressure into destilling tower, steam
Evaporate that process is steady, the process of ethanol distillation is steady, can save the consumption of steam, improves the yield of ethyl alcohol recycling.
(6) charging regulating valve is automatically controlled using pneumatic control valve：Purpose is that control feeds uniform and stable, distillation process
Steadily without fluctuation, distillation yield can be improved and reduce steam mono-consumption.
(7) flowmeter on feed pipe is set, carries out flow control：Purpose is that control charging is uniform and stable, flowmeter
The numerical value that numerical value is automatically controlled with pneumatic control valve in computer is proofreaded, and ensures the accuracy automatically controlled.
Description of the drawings
In order to make the purpose of the present invention, technical solution and advantageous effect clearer, the present invention provides drawings described below and carries out
Explanation：
Fig. 1 is ethyl alcohol waste liquid pretreatment system schematic diagram.
Fig. 2 is ethyl alcohol recovery system schematic diagram.
In figure：1-neutralizing tank, 2-liquid caustic soda measuring tank, 3-filtering sheet frame, 4-waste ethanol storage tank, 5-sample tap, 6-
Air admission valve, 7-return valve, 8-reboiler, 9-ethanol distillation tower, 10-preheater, the 11-the first condenser, 12-the second
Condenser, 13-third condenser, 14-vapour liquid separator, 15-finished product cooler, 16-flowmeter, 17-steam are into vapour gas
Dynamic valve, 18-charging pneumatic operated valve, 19-blowdown pneumatic operated valve, 20-outlet A, 21-outlet B, 22-return tank.
Specific embodiment
Below in conjunction with attached drawing, the preferred embodiment of the present invention is described in detail.
Embodiment 1
As shown in Figure 1, 2, the system of ethyl alcohol recycling automation control, is recycled including ethyl alcohol waste liquid pretreatment system and ethyl alcohol
System, the outlet of ethyl alcohol waste liquid pretreatment system are connected with the entrance of ethyl alcohol recovery system.
Ethyl alcohol recovery system include reboiler 8, ethanol distillation tower 9, preheater 10, vapour liquid separator 14, condenser system, into
Product cooler 15；The liquid outlet of preheater 10 is connected by the liquid inlet of pipeline with ethanol distillation tower 9, ethanol distillation tower 9
Steam (vapor) outlet be connected with the steam inlet of preheater 10, the steam (vapor) outlet of preheater 10 and the steam inlet phase of condenser system
Even, preheater 10 and the condensate outlet of condenser system are connected with the entrance of finished product cooler 15；9 bottom of ethanol distillation tower is set
Ethyl alcohol outlet A20 and outlet B21, outlet A20 are connected with the liquid inlet of reboiler 8, the outlet of reboiler 8 and ethyl alcohol
The boiling ethanol entrance port of destilling tower 9 is connected, and outlet B21 is connected with the liquid inlet of vapour liquid separator 14, vapour liquid separator 14
Steam outlet be connected with the steam entrance of ethanol distillation tower 9.
Condenser system includes the first condenser 11, the second condenser 12, third condenser 13, the steam of the first condenser 11
Outlet is connected with the steam inlet of the second condenser 12, the steam of the steam (vapor) outlet and third condenser 13 of the second condenser 12 enters
Mouth is connected.
The ethanol liquid conveyance conduit being connect with preheater 10 is equipped with flowmeter 16, connects preheater 10 and ethanol distillation
The liquid conducting pipes of tower 9 are equipped with charging pneumatic operated valve 18, and the steam lead road of reboiler 8 is equipped with steam into vapour pneumatic operated valve
The connecting pipe of 17, outlet B21 and vapour liquid separator 14 are equipped with blowdown pneumatic operated valve 19.
Ethyl alcohol waste liquid pretreatment system includes neutralizing tank 1, liquid caustic soda measuring tank 2, filtering sheet frame 3, waste ethanol storage tank 4, described
The discharge port of liquid caustic soda measuring tank 2 is connected with the feeding mouth of neutralizing tank 1, the discharge port of neutralizing tank 1 and the feeding mouth phase of filtering sheet frame 3
Even, the discharge port of filtering sheet frame 3 is connected with the feed liquid refluxing opening of neutralizing tank 1, and return valve 7 is set in connecting pipe, filters sheet frame 3
Discharge port is also connected with 4 entrance of waste ethanol storage tank.
The system of ethyl alcohol recycling automation control described in present embodiment includes following four part：
1st, waste ethanol pretreatment control loop：Realize that ethyl alcohol waste liquid will not corrode destilling tower after entering destilling tower and avoid blocking up
Delivery pump and column plate are filled in, waste ethanol is filtered by carrying out acid-base accommodation pH value in neutralizing tank 1 to neutrality using filter plate frame 3
Fall sediment, can avoid blocking delivery pump and column plate, keep the temperature of ethyl alcohol waste liquid and wine degree constant, keep the temperature of ethyl alcohol waste liquid
It is constant with wine degree, ensure that distillation process stabilization does not fluctuate, distillation yield can be improved, reduce energy consumption.
2nd, automatic feed control loop：Realize the continuous automatic feed of ethyl alcohol recovery system, ethyl alcohol after preheater by passing through
Pipeline enters ethanol distillation tower 9, according to the evaporation capacity of ethanol distillation tower 9 and discharge capacity adjust automatically feed rate.
3rd, automatic computer heating control circuit：Realize the automatic heating evaporation of ethyl alcohol recovery tower, the ethyl alcohol one in ethanol distillation tower 9
Lease making is crossed vapour liquid separator 14 and is discharged, and a part returns to ethanol distillation tower 9 by reboiler 8 and heated, and automatically adjusts steam
Size is measured, ensures tower reactor heating quantity of steam.
4th, automatic-discharging control loop：Realize 9 waste ethanol automatic-discharging of ethanol distillation tower, 9 bottom ethyl alcohol of ethanol distillation tower
It is discharged by vapour liquid separator 14, the circuit is according to temperature adjust automatically waste discharge flow quantity in ethanol distillation tower 9, it is ensured that second
9 continuous high-efficient of alcohol destilling tower evaporates, and can be automatically closed when temperature is less than 104 DEG C, it is zero to make the ethanol content in soiling solution, significantly
Improve distillation yield.
Embodiment 2
This implementation is described further embodiment 1, and ethyl alcohol recovery system further includes return tank 22, preheater 10 and first
The liquid outlet of condenser 11 is connected with the entrance of return tank 22, and the outlet of return tank 22 passes through pipeline and ethanol distillation tower 9
Alcohol reflux mouth is connected.
Embodiment 3
The method that ethyl alcohol recycles automation control：Second is entered back into after first waste ethanol is pre-processed in pretreatment system
Alcohol recycling Distallation systm is distilled.After pre-processing as waste ethanol coarse-grain mother liquor is neutralized, filtered out using filter plate frame
Sediment；In N-process, at 40~50 DEG C, wine degree controls the waste liquor PH after 0%~50%vol, neutralization for waste liquid temperature control
It is 6.7~7.2.
Distillation process is：Steam enters ethanol distillation tower by reboiler and carries out tower body preheating, while control steam pressure,
Steam pressure control after treating tower body preheating, opens condenser system, waste ethanol after pretreatment in 0.04~0.05Mpa
Liquid is distilled, while control fluid flow after being preheated by preheater into ethanol distillation tower, and waste ethanol flow control exists
3.5~5.0m3/ h, and each section of temperature of the temperature of adjusting control condenser system and ethanol distillation tower, waste ethanol flow control is 3.5
~5.0m3/ h, destilling tower column bottom temperature are controlled at 104~110 DEG C, and at 80~95 DEG C, tower top temperature controls for temperature control in tower
At 75~77 DEG C, the control of the first condenser temperature is at 65~75 DEG C, and at 40~60 DEG C, third condenses the control of the second condenser temperature
Device temperature is controlled below 34 DEG C.The preheated device of steam distilled out from ethanol distillation tower carries out heat exchange, then pass through condensation
System condensing finally carries out finished product cooling and recycling, and an ethanol liquid part for ethanol distillation tower bottom after reboiler by returning
To ethanol distillation tower, a part in the form of steam by returning to ethanol distillation tower after vapour liquid separator.
Ethyl alcohol waste liquid preprocessing process the specific steps are：
1st, waste ethanol coarse-grain mother liquor is neutralized
1) coarse-grain mother liquor and top washing lotion are put into neutralizing tank 1, based on 1.0~2.0% (kg/L) of coarse-grain mother liquor volume
Calculate calcium carbonate dosage.
2) stirring is opened, the calcium carbonate of calculation amount is slowly added to by charge door；At this point, a large amount of carbon dioxide gas can be generated
Body, so should be slowly added into, in case feed liquid is overflowed.Calcium carbonate is added, continues stirring 20 minutes.
3) liquid caustic soda in liquid caustic soda measuring tank 2 adds in neutralizing tank 1, adjusts pH to 6.7~7.2 (test of pH test paper), N-process
Middle 40~50 DEG C of waste liquid temperature of holding；30%~50%vol of waste liquid wine degree.
2nd, press filtration top is washed
1) filter press number of units determines：Every 70m2Frame holds 1.2m3Filter press, should be into 20~35m of neutralizer3。
2) after neutralizing, bottom valve, disengaging pump valve, the inlet valve on plate and frame filter press, the return valve 7 of neutralizing tank 1 are opened,
Dnockout pumps 7 are opened, feed liquid passes back into former neutralizing tank 1 through plate and frame filter press, and return time 10~20 minutes goes out in plate and frame filter press
Material mouth sampling observation, after filtrate clarification, closing volume valve 7 is opened plate and frame filter press outlet valve, is fed to waste ethanol storage tank 4.
3) standby top washing lotion：Enough water is put into empty neutralizing tank 1.
4) waste ethanol liquid top remaining in filtering sheet frame 3 is come out with top washing lotion.
5) air admission valve 10 is opened, is blown 1 hour or more, air admission valve is closed, tears sheet frame discharging open.
Waste ethanol be distilled to recover process the specific steps are：
1) the bottom of towe valve of ethanol distillation tower 9 is closed, opens tower top exhaust-valve, is opened into steam into vapour pneumatic operated valve 17, steam
Pressure control when tower top just emerges steam, is closed tower top exhaust-valve, is opened immediately in 0.04~0.05Mpa, progress tower body preheating
Open the inlet/outlet valve of preheater disengaging valve and each condenser cooling water.
2) charging pneumatic operated valve 18 and blowdown pneumatic operated valve 19 are opened, starts feed pump, observes and adjust the feed liquor of flowmeter 16
Valve makes flow control in 3.5~5.0m3/h。
3) steam is adjusted into vapour pneumatic operated valve 17 and each condenser inlet valve and corresponding outlet valve, and column bottom temperature control is made to exist
104~110 DEG C, temperature control is between 80~95 DEG C in tower, and tower top temperature control is at 75~77 DEG C, the first condenser temperature control
System is at 65~75 DEG C, and at 40~60 DEG C, third condenser temperature controls below 34 DEG C the control of the second condenser temperature.It distilled
Cheng Zhong, the voltage-controlled system of tower is in 0.02~0.05MPa.
4) for qualified recycling ethyl alcohol (>=90%L/L, 20 DEG C) into finished product basin, underproof recycling ethyl alcohol flows into useless second
Alcohol basin re-starts distillation.
Embodiment 4
Ethyl alcohol recycling is carried out using the device before transformation：By the steam in embodiment 3 into vapour pneumatic operated valve 17, charging pneumatic operated valve
18th, blowdown pneumatic operated valve 19 all replaces with hand-operated valve, other devices and its connection mode are the same as embodiment 3.Ethyl alcohol before transformation returns
It is as follows to receive concrete operation step：
First, ethyl alcohol waste liquid is pre-processed, the specific steps are：
1st, waste ethanol coarse-grain mother liquor is neutralized
1) coarse-grain mother liquor and top washing lotion are put into neutralizing tank, is calculated by 1.0~2.0% (kg/L) of coarse-grain mother liquor volume
Calcium carbonate dosage.
2) stirring is opened, the calcium carbonate of calculation amount is slowly added to by charge door；At this point, a large amount of carbon dioxide gas can be generated
Body, so should be slowly added into, in case feed liquid is overflowed.Calcium carbonate is added, continues stirring 20 minutes.
3) liquid caustic soda in liquid caustic soda measuring tank adds in neutralizing tank, adjusts pH to 6.5~8.0 (test of pH test paper), in N-process
Waste liquid wine degree and waste liquid temperature are not controlled.
2nd, press filtration top is washed (with embodiment 3)
Then, waste ethanol is distilled to recover, the specific steps are：
1) the bottom of towe valve of ethanol distillation tower is closed, tower top exhaust-valve is opened, opens into steam hand-operated valve, Steam pressure control
In 0.04~0.06Mpa, tower body preheating is carried out, when tower top just emerges steam, tower top exhaust-valve is closed immediately, opens preheater
Pass in and out the inlet/outlet valve of valve and each condenser cooling water.
2) inlet valve and blowdown valve are opened, starts feed pump, observes and adjust the liquid feed valve of flowmeter, flow control is made to exist
3.5~5.0m3/h。
3) steam inlet valve and each condenser inlet valve and corresponding outlet valve are adjusted, make column bottom temperature control 104~
110 DEG C, temperature control is between 80~95 DEG C in tower, and at 75~77 DEG C, the control of the first condenser temperature exists for tower top temperature control
65~75 DEG C, at 40~60 DEG C, third condenser temperature controls below 34 DEG C the control of the second condenser temperature.Distillation process
In, the voltage-controlled system of tower is in 0.02~0.05MPa.
4) for qualified recycling ethyl alcohol (>=90%L/L, 20 DEG C) into finished product basin, underproof recycling ethyl alcohol flows into useless second
Alcohol basin re-starts distillation.
Embodiment 5
The energy consumption and alcohol yield of embodiment 3 and embodiment 4 compare, and refer to table 1.
1 energy consumption of table is compared with alcohol yield
| Project | Embodiment 4 | Embodiment 3 |
| Alcohol unit consumption | 1.86 tons/ton | 1.45 tons/ton |
| Steam mono-consumption | 1.16 tons/ton | 1.03 tons/ton |
| Alcohol recycle rate | 95% | 97% |
It can be seen that device and method using the present invention, the skill before being both less than transformed in alcohol unit consumption and steam mono-consumption
Art, alcohol recycle rate is higher than the technology before transformation.Therefore the technical method of the present invention realizes energy-saving, improves alcohol steaming
Evaporate yield.
Finally illustrate, preferred embodiment above is merely illustrative of the technical solution of the present invention and unrestricted, although logical
It crosses above preferred embodiment the present invention is described in detail, however, those skilled in the art should understand that, can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (5)
1. the system that ethyl alcohol recycles automation control, it is characterised in that：Including ethyl alcohol waste liquid pretreatment system and ethyl alcohol recycling system
System, the outlet of the ethyl alcohol waste liquid pretreatment system is connected with the entrance of ethyl alcohol recovery system；The ethyl alcohol recovery system includes
Reboiler（8）, ethanol distillation tower（9）, preheater（10）, vapour liquid separator（14）, condenser system and finished product cooler（15）；Institute
State preheater（10）Liquid outlet pass through pipeline and ethanol distillation tower（9）Liquid inlet be connected, the ethanol distillation tower（9）
Steam (vapor) outlet and preheater（10）Steam inlet be connected, preheater（10）Steam (vapor) outlet and condenser system steam inlet
It is connected, the preheater（10）With the condensate outlet of condenser system and finished product cooler（15）Entrance be connected；The ethyl alcohol
Destilling tower（9）Bottom setting ethyl alcohol outlet A（20）With outlet B（21）, the outlet A（20）With reboiler（8）Liquid
Body entrance is connected, reboiler（8）Outlet and ethanol distillation tower（9）Boiling ethanol entrance port be connected, the outlet B（21）With
Vapour liquid separator（14）Liquid inlet be connected, the vapour liquid separator（14）Steam outlet with ethanol distillation tower（9）Vapour
Body entrance is connected；With preheater（10）The ethanol liquid conveyance conduit of connection is equipped with flowmeter（16）, connect preheater（10）
With ethanol distillation tower（9）Liquid conducting pipes be equipped with charging pneumatic operated valve（18）, reboiler（8）Steam lead road be equipped with
Steam is into vapour pneumatic operated valve（17）, outlet B（21）With vapour liquid separator（14）Connecting pipe be equipped with blowdown pneumatic operated valve（19）；
The ethyl alcohol waste liquid pretreatment system includes neutralizing tank（1）, liquid caustic soda measuring tank（2）, filtering sheet frame（3）With waste ethanol storage tank（4）,
The liquid caustic soda measuring tank（2）Discharge port and neutralizing tank（1）Feeding mouth be connected, the neutralizing tank（1）Discharge port and filtering
Sheet frame（3）Feeding mouth be connected, the filtering sheet frame（3）Discharge port and neutralizing tank（1）Feed liquid refluxing opening be connected, connecting tube
Return valve is set on road（7）, the filtering sheet frame（3）Discharge port also with waste ethanol storage tank（4）Entrance is connected.
2. the system of ethyl alcohol recycling automation control according to claim 1, it is characterised in that：The condenser system includes
First condenser（11）, the second condenser（12）, third condenser（13）, first condenser（11）Steam (vapor) outlet and
Two condensers（12）Steam inlet be connected, the second condenser（12）Steam (vapor) outlet and third condenser（13）Steam inlet
It is connected.
3. the system of ethyl alcohol recycling automation control according to claim 1, it is characterised in that：The ethyl alcohol recovery system
Further include return tank（22）, the preheater（10）With the first condenser（11）Liquid outlet and return tank（22）Entrance
It is connected, return tank（22）Outlet pass through pipeline and ethanol distillation tower（9）Alcohol reflux mouth be connected.
4. the side of ethyl alcohol recycling automation control is carried out using the system of ethyl alcohol described in claim 1 recycling automation control
Method, it is characterised in that：Ethyl alcohol recovery system is entered back into after first waste ethanol is pre-processed in pretreatment system to distill
Recycling；The distillation recovery process is：Steam enters ethanol distillation tower by reboiler and carries out tower body preheating, while control steam
Pressure after treating tower body preheating, opens condenser system, and waste ethanol liquid after pretreatment enters after being preheated by preheater
Ethanol distillation tower is distilled, while controls fluid flow, and the temperature of adjusting control condenser system and each section of ethanol distillation tower
Temperature, the preheated device of steam distilled out from ethanol distillation tower carry out heat exchange, then condense by condenser system, finally carry out
Finished product cools down and recycling, and the ethanol liquid part of ethanol distillation tower bottom is by returning to ethanol distillation tower after reboiler, one
Divide by returning to ethanol distillation tower after vapour liquid separator in the form of steam；The pretreatment is during waste ethanol coarse-grain mother liquor is carried out
With it is rear, filter out sediment using filter plate frame；In the N-process, at 40~50 DEG C, the control of wine degree exists for waste liquid temperature control
0%~50% vol, the waste liquor PH after neutralization are 6.7~7.2.
5. the method for ethyl alcohol recycling automation control according to claim 4, it is characterised in that：In the distillation process,
Steam pressure control in 0.04~0.05Mpa, the voltage-controlled system of destilling tower in 0.02~0.05MPa, waste ethanol flow control 3.5~
5.0 m3/ h, destilling tower column bottom temperature are controlled at 104~110 DEG C, and at 80~95 DEG C, tower top temperature control exists for temperature control in tower
75~77 DEG C, the control of the first condenser temperature is at 65~75 DEG C, and the control of the second condenser temperature is at 40~60 DEG C, third condenser
Temperature control is at 34 DEG C hereinafter, the voltage-controlled system of destilling tower is in 0.02~0.05MPa.
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| CN112923601A (en) * | 2019-12-05 | 2021-06-08 | 中粮生物科技股份有限公司 | Ethanol steam waste heat recovery method and device, ethanol steam dehydration method and system |
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