CN107213659A - A kind of function of mechanical steam recompression system and control method - Google Patents
A kind of function of mechanical steam recompression system and control method Download PDFInfo
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- CN107213659A CN107213659A CN201610809729.2A CN201610809729A CN107213659A CN 107213659 A CN107213659 A CN 107213659A CN 201610809729 A CN201610809729 A CN 201610809729A CN 107213659 A CN107213659 A CN 107213659A
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- 238000000034 method Methods 0.000 title claims description 19
- 239000007788 liquid Substances 0.000 claims abstract description 101
- 230000008676 import Effects 0.000 claims abstract description 63
- 239000013505 freshwater Substances 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 119
- 239000000463 material Substances 0.000 claims description 55
- 230000001105 regulatory effect Effects 0.000 claims description 27
- 238000007906 compression Methods 0.000 claims description 24
- 230000006835 compression Effects 0.000 claims description 20
- 239000007921 spray Substances 0.000 claims description 12
- 239000012141 concentrate Substances 0.000 claims description 11
- 238000001704 evaporation Methods 0.000 claims description 8
- 230000008020 evaporation Effects 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 7
- 230000000740 bleeding effect Effects 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 238000009833 condensation Methods 0.000 claims description 5
- 230000005494 condensation Effects 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 4
- 230000002596 correlated effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 7
- 238000001816 cooling Methods 0.000 description 7
- 239000000243 solution Substances 0.000 description 6
- 238000005119 centrifugation Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000002918 waste heat Substances 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000007701 flash-distillation Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 230000001568 sexual effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/0082—Regulation; Control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/30—Accessories for evaporators ; Constructional details thereof
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B3/00—Other methods of steam generation; Steam boilers not provided for in other groups of this subclass
- F22B3/04—Other methods of steam generation; Steam boilers not provided for in other groups of this subclass by drop in pressure of high-pressure hot water within pressure- reducing chambers, e.g. in accumulators
- F22B3/045—Other methods of steam generation; Steam boilers not provided for in other groups of this subclass by drop in pressure of high-pressure hot water within pressure- reducing chambers, e.g. in accumulators the drop in pressure being achieved by compressors, e.g. with steam jet pumps
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The present invention provides a kind of function of mechanical steam recompression system, including evaporative condenser, centrifugal compressor, helical-lobe compressor, electric heater, vapour liquid separator and fresh-water tank, evaporative condenser connects centrifugal compressor and helical-lobe compressor, the first valve and sluicing separator are provided between evaporative condenser and centrifugal compressor, the second valve is provided between evaporative condenser and helical-lobe compressor, centrifugal compressor connects helical-lobe compressor, the outlet import of helical-lobe compressor, helical-lobe compressor connects the condenser pipe of evaporative condenser by vapour liquid separator.The function of mechanical steam recompression system that the present invention is provided need not start heat source stream, can realize high-vapor-pressure ratio (temperature rise of compressed steam saturation) and high steam flow, function of mechanical steam recompression system with higher energy source efficiency to be a kind of, expansion function of mechanical steam recompression system application can be played, the effect of industrial energy saving is realized.
Description
Technical field
The present invention relates to a kind of function of mechanical steam recompression system and control method, belong to industrial distillation and concentration and Heat Supply Engineering
Middle Low Temperature Steam heat recovery field.
Background technology
Global energy problem becomes increasingly conspicuous, and AND ENERGY RESOURCES CONSUMPTION IN CHINA is high but energy utilization rate is low, in the urgent need to energy intensive
Type industrial circle carries out reducing energy consumption.Mechanical vapor recompression technology is to utilize heat pump principle, reclaims Low Temperature Steam waste heat, is utilized
Mechanical compressor compressed steam, can provide the heat source stream of alternative Boiler Steam, and can be widely used in printing and dyeing, at sewage
The industrial circles such as reason, desalinization, chemical industry rectifying.Research shows that the energy consumption for improving steam pressure with compressor only uses boiler
Produce the 5-10% of equivalent steam energy consumption.
Although function of mechanical steam recompression system has higher energy-saving potential, its application is limited to mechanical vapour with popularization
Compressor Technology.Vapor is primarily due to higher specific volume, material liquid disposal ability during system practical application is limited to
Volume flow achieved by compressor.Secondly because the adiabatic exponent of vapor is higher, when system operation requires higher pressure
During contracting vapo(u)rous temperature rise, compressor operating pressure ratio is higher, thus compressor needed the problem of overcome higher exhaust temperature.
In addition, current function of mechanical steam recompression system is required for providing extra heat source stream when starting, it is necessary to first steam
Material liquid is sent out, steam is produced and enters compressor, entered when system stable operation, then completely with compressed steam as heat source stream
System.Heat source stream during general starting up is all Boiler Steam, and energy resource consumption is higher, and causing the cost of system increases.
Usual centrifugal compressed function realizes larger volume flow, but because of the surge of its sensitiveness and low discharge to drop
Problem, adaptation sexual intercourse is poor, and operation pressure ratio should not be too high.And helical-lobe compressor can be sprayed because of its resistance to liquid characteristic by swept volume
The mode of water cooling, realizes the high pressure ratio and low exhaust temperature of both vapor compression, but its be only applicable in low volume flow.
Therefore function of mechanical steam recompression systematic difference is promoted and cost reduction, can start thermal source by solving system boot
Vapor problem, provide big flow and the mechanical vapor-compression form of high pressure ratio both main paths set out, and then can certain journey
Alleviate the pressure of industrial production energy resource consumption on degree.
The content of the invention
The present invention can solve the above problems there is provided one kind start without extra heat source steam very well, with reference to centrifugal compressor
With helical-lobe compressor features, big flow, the function of mechanical steam recompression system of high pressure ratio mechanical vapor-compression are realized, and be
The control method of system.
To solve the above problems, the present invention provides a kind of function of mechanical steam recompression system, including evaporative condenser, centrifugation pressure
Filter screen, institute are provided with the top of contracting machine, helical-lobe compressor, electric heater, vapour liquid separator and fresh-water tank, the evaporative condenser
State and shower is provided with below filter screen, be provided with header tank and the condensation connected with the header tank below the shower
Pipe, the gas outlet of the header tank is provided with air bleeding valve and vavuum pump, and the import of the shower passes through provided with the first water pump
The outlet of electric heater described in pipeline connection, the evaporative condenser connects the centrifugal compressor by the venthole at the top of it
Import and the helical-lobe compressor import, also set up on the pipeline between the evaporative condenser and the centrifugal compressor
Have and be provided with the second valve on the first valve and sluicing separator, the pipeline between the evaporative condenser and the helical-lobe compressor
Door, the outlet of the centrifugal compressor is by being provided with screw rod described in the pipeline connection of material liquid preheating heat exchanger and the 3rd valve
The import of compressor, the outlet of the helical-lobe compressor is by being provided with helical-lobe compressor described in the pipeline connection of the 4th valve
Import, the outlet of the helical-lobe compressor also connects the import of the vapour liquid separator, the outlet of the vapour liquid separator
The import of the condenser pipe of the evaporative condenser, the material liquid import of the material liquid preheating heat exchanger and the material liquid
The first regulating valve is provided between the material liquid outlet of preheating heat exchanger, the material liquid outlet of the material liquid preheating heat exchanger is also
Respectively the heat exchanger of pipeline connection second by the pipeline provided with the 5th valve and provided with the second regulating valve material liquid outlet and
The material liquid import of second heat exchanger, the fresh water import of second heat exchanger passes through provided with described in the 3rd regulating valve pipeline connection
The delivery port of vapour liquid separator, the fresh water import of second heat exchanger also passes through the pipeline connection second provided with the 4th regulating valve
Water pump, the import of second water pump also passes through the delivery port of fresh-water tank described in the pipeline connection provided with the 6th valve, described
The water-spraying control of helical-lobe compressor described in the outlet of two water pumps mouthful, the water outlet of second heat exchanger passes through provided with the
Seven valve pipelines connect the water inlet of the fresh-water tank, and the material liquid outlet of second heat exchanger is by being arranged in parallel the 3rd
The import of the water pump of pipeline connection the 3rd of heat exchanger and the 4th heat exchanger, evaporation described in the outlet of the 3rd water pump is cold
The import of the shower of condenser, the delivery port of the header tank of the evaporative condenser passes through the pipe provided with the 4th water pump
Road connects the fresh water import of the 3rd heat exchanger and connects the fresh-water tank, institute by the water outlet of the 3rd heat exchanger
The concentrated solution outlet for stating evaporative condenser bottom is provided with the 5th water pump, and the outlet of the 5th water pump is on the one hand by provided with the
The import of 3rd water pump described in the pipeline connection of eight valves, on the other hand by the 4th described in the pipeline connection provided with the 9th valve
The concentrate import of heat exchanger is simultaneously discharged by the concentrated solution outlet of the 4th heat exchanger.
Further, the import of the electric heater is provided with the tenth valve.
Further, the venthole at the top of the evaporative condenser is additionally provided with the 11st valve.
Further, it is additionally provided with the 12nd valve between the delivery port of the header tank and the 4th water pump.
Further, the material liquid import of the 3rd heat exchanger and the material liquid import of the 4th heat exchanger are respectively equipped with
13rd valve and the 14th valve.
Further, the import of the 3rd water pump is provided with the 15th valve, and the outlet of first water pump is provided with the 16th
Valve.
In addition the present invention also provides the control method of above-mentioned function of mechanical steam recompression system, including：
Step one：Start the vavuum pump first to vacuumize system, and open the electric heater, when system is true
Hot water in reciprocal of duty cycle and the electric heater is reached after requirement, starts the hot water warp in first water pump, the electric heater
Cross after pressurization by the shower penetrating evaporative condenser；
Step 2：First valve is closed, second valve and the 4th valve is opened, starts the screw rod pressure
Contracting machine, due to the evaporative condenser middle position negative pressure, the hot water of penetrating can absorb self heat and produce low-flash vapour, flash steam
Entered described through the 4th valve again after the helical-lobe compressor primary compression after the filter screen filters out droplets of feed
Helical-lobe compressor second compression, so circulation again, improves the quality (flow and temperature) of compressed steam；
Step 3：The 4th valve is closed, now the steam of high-quality enters the vapour liquid separator by the road, then
Into the condenser pipe of the evaporative condenser；
Step 4：The vavuum pump is closed, first valve is opened, second valve is closed, starts the centrifugation
Compressor, the steam of high-quality, which enters, itself to be condensed after the condenser pipe and discharges heat so that sprayed into by the shower
Hot water produces steam, and the steam carries out one stage of compression by centrifugal compressor suction, then is carried out through the helical-lobe compressor
After two-stage compression, the condenser pipe of the condenser/evaporator, so circulation, by described cold are entered through the vapour liquid separator
The water that solidifying pipework condensation is produced enters the header tank, and the gas without condensation then passes through the air bleeding valve discharge system；
Step 5：The electric heater, first water pump are closed, starts the 3rd water pump, now material liquid passes through
The material liquid preheating heat exchanger, second heat exchanger and the 3rd heat exchanger and the 4th heat exchanger are preheated
Afterwards, the shower is forced through by the 3rd water pump and sprays into the evaporative condenser, absorbed heat and produce steam；
Step 6：Spray into the evaporative condenser but unevaporated concentration of raw material increases because of the evaporation of water, be referred to as
Concentrate, according to different process requirement, it is necessary to be controlled to its concentration, concentrate is extracted out by water pump, according to its concentration, is adjusted
Save the 8th valve, control enters the 3rd water pump and continues to participate in the concentrated solution discharge of system circulation；Remaining concentrate is through the 9th
Valve enters the 4th heat exchanger preheating material liquid, discharges or is collected as product afterwards.
Further, the helical-lobe compressor in the process of running, water outlet of second water pump from the vapour liquid separator
The delivery port of mouth and the fresh-water tank draws water, and is entered after pressurization by the water-spraying control mouthful of the helical-lobe compressor for its cooling.
Further, the aperture of first regulating valve and the degree of superheat positive of the material liquid preheating heat exchanger outlet vapor
Close.
Further, the aperture of second regulating valve and the temperature positive correlation of the delivery port of the vapour liquid separator, the 4th
The aperture of regulating valve and the temperature of second unit fixed on water pump suction are negatively correlated, aperture and the vapor-liquid separation of the 3rd regulating valve
Liquid level positive correlation inside device.
Compared with prior art, technical scheme has advantages below：
Function of mechanical steam recompression system and control method that the present invention is provided, when system starts, by the way that system is vacuumized
The high-temperature water for producing electric water heater heating sprays into flash distillation after evaporative condenser and produces Low Temperature Steam, and utilizes helical-lobe compressor pressure
Contracting Low Temperature Steam provides heat source stream；When the steam production in evaporative condenser increases to certain value, centrifugal compressor is opened,
As one-level both vapor compression, now the suction vapour of helical-lobe compressor is the compressed steam come out from centrifugal compressor, and steam is carried out
Then two-stage compression realizes the stabilization of system there is provided the heat source stream with higher temperature and pressure for entering evaporative condenser
Operation；The heat for the superheated steam that centrifugal compressor comes out is absorbed using heat exchanger simultaneously, material liquid is preheated, and to spiral shell
Bar compressor is inhaled the vapour degree of superheat and is controlled；By to water-spraying control in helical-lobe compressor swept volume, to reduce during high pressure ratio
The compressed steam degree of superheat, while the cooling effect of water can make compression process close to constant temperature process, liquid water can also play sealing
Effect, so as to improve the performance of helical-lobe compressor.The present invention need not start heat source stream for one kind, can realize high-vapor-pressure ratio
(temperature rise of compressed steam saturation) and high steam flow, with it is higher can source efficiency function of mechanical steam recompression system, can play
Expand function of mechanical steam recompression system application, realize the effect of industrial energy saving.
Brief description of the drawings
Fig. 1 is the system schematic of the embodiment of the present invention；
In figure：1 it is evaporative condenser, 2 be centrifugal compressor, 3 be helical-lobe compressor, 4 be electric heater, 5 is vapour-liquid point
It is fresh-water tank from device, 6,7 be material liquid preheating heat exchanger, 8 be the second heat exchanger, 9 be the 3rd heat exchanger, 10 is the 4th heat exchange
Device, 11 be sluicing separator, 12 be vavuum pump, 13 be the first water pump, 14 be the 3rd water pump, 15 be the 5th water pump, 16 be the 4th
Water pump, 17 be the second water pump, 18 be air bleeding valve, 19 be the tenth valve, 20 be the 16th valve, 21 be the 11st valve, 22 be
First valve, 23 be the second valve, 24 be the 4th valve, 25 be the 3rd valve, 26 be the first regulating valve, 27 be the 5th valve,
28 it is the second regulating valve, 29 be the 3rd regulating valve, 30 be the 7th valve, 31 be the 13rd valve, 32 be the 14th valve, 33 is
9th valve, 34 be the 8th valve, 35 be the 15th valve, 36 be the 12nd valve, 37 be the 4th regulating valve, 38 be the 6th valve
Door, 1a are that filter screen, 1b are that shower, 1c are that header tank, 1d are condenser pipe.
Embodiment
It is understandable to enable the above objects, features and advantages of the present invention to become apparent, below in conjunction with the accompanying drawings to the present invention
Specific embodiment be described in detail.
System embodiment
As shown in Figure 1：A kind of function of mechanical steam recompression system, including evaporative condenser 1, centrifugal compressor 2, screw compression
Machine 3, electric heater 4, vapour liquid separator 5 and fresh-water tank 6, the top of the evaporative condenser 1 are provided with filter screen 1a, the filter screen
It is provided with header tank 1c is provided with below shower 1b, the shower 1b and is connected with the header tank 1c below 1a
Condenser pipe 1d, the header tank 1c gas outlet are provided with air bleeding valve 18 and vavuum pump 12, and the import of the shower 1b passes through
The outlet of electric heater 4 described in pipeline connection provided with the first water pump 13, the evaporative condenser 1 passes through the venthole at the top of it
The import of the centrifugal compressor 2 and the import of the helical-lobe compressor 3 are connected, the evaporative condenser 1 is pressed with the centrifugation
The first valve 22 and sluicing separator 11, the evaporative condenser 1 and the spiral shell are also disposed with pipeline between contracting machine 2
The second valve 23 is provided with pipeline between bar compressor 3, the outlet of the centrifugal compressor 2 is pre- by being provided with material liquid
The import of helical-lobe compressor 3 described in the pipeline connection of the valve 25 of heat exchanger 7 and the 3rd, the outlet of the helical-lobe compressor 3 leads to
The import for being provided with helical-lobe compressor 3 described in the pipeline connection of the 4th valve 24 is crossed, the outlet of the helical-lobe compressor 3 is also connected
The import of the vapour liquid separator 5, the condenser pipe 1d of evaporative condenser 1 described in the outlet of the vapour liquid separator 5
Import, the material liquid of the material liquid import of the material liquid preheating heat exchanger 7 and the material liquid preheating heat exchanger 7 exports it
Between be provided with the first regulating valve 26, the material liquid of the material liquid preheating heat exchanger 7 is exported also respectively by provided with the 5th valve
The material liquid outlet of 27 pipeline and the second heat exchanger of pipeline connection 8 provided with the second regulating valve 28 and the original of the second heat exchanger 8
Liquor inlet, the fresh water import of second heat exchanger 8 passes through provided with vapour liquid separator 5 described in the pipeline connection of the 3rd regulating valve 29
Delivery port, the fresh water import of second heat exchanger 8 also by the second water pump of pipeline connection 17 provided with the 4th regulating valve 37,
The import of second water pump 17 also passes through the delivery port of fresh-water tank 6 described in the pipeline connection provided with the 6th valve 38, described
The water-spraying control mouthful of helical-lobe compressor 3 described in the outlet of two water pumps 17, the water outlet of second heat exchanger 8 is by setting
There is the water inlet of fresh-water tank 6 described in the pipeline connection of the 7th valve 30, the material liquid outlet of second heat exchanger 8 is set by parallel connection
It is equipped with the import of the water pump 14 of pipeline connection the 3rd of the 3rd heat exchanger 9 and the 4th heat exchanger 10, the outlet of the 3rd water pump 14
Connect the shower 1b of the evaporative condenser 1 import, the header tank 1c of the evaporative condenser 1 delivery port
By the fresh water import of the 3rd heat exchanger 9 described in the pipeline connection provided with the 4th water pump 16 and pass through the 3rd heat exchanger 9
Water outlet connects the fresh-water tank 6, and the concentrated solution outlet of the bottom of evaporative condenser 1 is provided with the 5th water pump 15, described
On the one hand the outlet of 5th water pump 15 passes through the import of the 3rd water pump 14 described in the pipeline connection provided with the 8th valve 34, the opposing party
Face by the concentrate import of the 4th heat exchanger 10 described in the pipeline connection provided with the 9th valve 33 and pass through the described 4th heat exchange
The concentrated solution outlet discharge of device 10.
The import of the electric heater 4 is provided with the tenth valve 19.
The venthole at the top of evaporative condenser 1 is additionally provided with the 11st valve 21.
The 12nd valve 36 is additionally provided between the delivery port of the header tank 1c and the 4th water pump 16.
The material liquid import of 3rd heat exchanger 9 and the material liquid import of the 4th heat exchanger 10 are respectively equipped with the tenth
Three valves 31 and the 14th valve 32.
The import of 3rd water pump 14 is provided with the 15th valve 35, and the outlet of first water pump 13 is provided with the 16th valve
Door 20.
Embodiment of the method
A kind of control method of function of mechanical steam recompression system, comprises the following steps：
Step one：Start the vavuum pump 12 first to vacuumize system, and open the electric heater 4, when being
Hot water in system vacuum and the electric heater 4 is reached after requirement, is started in first water pump 13, the electric heater 4
Hot water the evaporative condenser 1 is sprayed into by the shower 1b after pressurization；
Step 2：First valve 22 is closed, second valve 23 and the 4th valve 24 is opened, started described
Helical-lobe compressor 3, due to the middle position negative pressure of evaporative condenser 1, the hot water of penetrating can absorb self heat and produce low-flash
Vapour, flash steam after the filter screen 1a filters out droplets of feed by after the primary compression of helical-lobe compressor 3 again through the described 4th
Valve 24 enters the helical-lobe compressor 3 second compression again, and so circulation improves the quality of steam；
Because produced flash steam amount is relatively low, it is impossible to directly open the centrifugal compressor 2, first valve need to be closed
Door 22, while opening second valve 23, opens the helical-lobe compressor 3 and compresses produced Low Temperature Steam, because flash steam
Temperature and pressure it is relatively low, the pressure after primary compression also will not be too high with temperature, it is impossible to meets the requirement of system heat sources steam.
Now first the steam discharge of all or part of helical-lobe compressor 3 can be bypassed to the helical-lobe compressor 3 by the 4th valve 24
Import, the flash steam come out with the evaporative condenser 1 is mixed after increasing temperature and pressure, is entered back into the helical-lobe compressor 3 and is continued quilt
Compression, so as to improve constantly steam pressure and temperature.
Step 3：The 4th valve 24 is closed, now the steam of high-quality enters the vapour liquid separator 5 by the road,
Subsequently into the condenser pipe 1d of the evaporative condenser 1；
The vapour liquid separator 5 can also start the effect of stable steam pressure.
Step 4：The vavuum pump 12 is closed, first valve 22 is opened, second valve 23 is closed, starts institute
Centrifugal compressor 2 is stated, the steam of high-quality, which enters, itself to be condensed after the condenser pipe 1d and discharge heat so that by the spray
The hot water that pipe 1b is sprayed into produces steam, and the steam sucks carry out one stage of compression by the centrifugal compressor 2, then through the screw rod
Compressor 3 carries out two-stage compression, and the condenser pipe 1d of the evaporative condenser 1 is entered through the vapour liquid separator 5, is so followed
Ring, the water produced is condensed by the condenser pipe 1d and enters the header tank 1c, the gas without condensation then passes through the exhaust
The discharge system of valve 18；
Under the heat source stream effect that the helical-lobe compressor 3 is provided, the evaporation of shower water can increase steam production.Work as stream
When the steam flow for going out the evaporative condenser 1 is higher than the 2 minimum flow requirement of centrifugal compressor, you can open the centrifugation
Compressor 2, is compressed to produced Low Temperature Steam, and Low Temperature Steam first passes through described let out before entering the centrifugal compressor 2
Separator 11, can avoid droplets from entering the centrifugal compressor 2.
Step 5：The electric heater 4, first water pump 13 are closed, starts the 3rd water pump 14, now material liquid
By the material liquid preheating heat exchanger 7, second heat exchanger 8 and the 3rd heat exchanger 9 and the 4th heat exchanger
10 preheated after the shower 1b be forced through by the 3rd water pump 14 spray into the evaporative condenser 1, absorb heat
Produce steam.Steam after being compressed through the centrifugal compressor 2 is superheated steam, and it is reclaimed using the liquid preheating heat exchanger 7
Heat, is preheated to material liquid, in this way, suction vapour of the steam after being boosted and cooling as the helical-lobe compressor 3.It is described
The principle of the recovered steam heat of liquid preheating heat exchanger 7 is to ensure that the helical-lobe compressor 3 inhales vapour for saturated vapor, can so be dropped
The suction vapour specific volume of the low helical-lobe compressor 3, and then can match with the volume flow of the centrifugal compressor 2, it is ensured that compression
The quality of steam.
The helical-lobe compressor 3 in the process of running, second water pump 17 from the delivery port of the vapour liquid separator 5 and
The delivery port of the fresh-water tank 6 draws water, and is entered after pressurization by the cold water outlet of the helical-lobe compressor 3 and is cooled down for it.
The aperture of first regulating valve 26 and the degree of superheat positive correlation of the outlet vapor of material liquid preheating heat exchanger 7.
The aperture of second regulating valve 28 and the temperature positive correlation of the delivery port of the vapour liquid separator 5, the 4th regulation
The aperture of valve 37 and the temperature of the import of the second water pump 17 are negatively correlated, aperture and the vapour-liquid point of the 3rd regulating valve 29
From the liquid level positive correlation inside device 5.
Because the helical-lobe compressor 3 suction stripping temperature and pressure are all raised, its operation pressure ratio is also higher, must now spray water
Cooling, reduces the exhaust temperature of the helical-lobe compressor 3, sprays into the cooling effect of water and can make compression process close to constant temperature process,
Can also there is certain sealing function to each leakage path simultaneously, so as to improve the performance of the helical-lobe compressor 3, and then ensure
The operational efficiency of system.
Material liquid after being preheated by the steam discharge of centrifugal compressor 2 can go successively to second heat exchanger 8, with outflow institute
State in the penetrating screw compression 3 of vapour liquid separator 5 but unevaporated part high-temperature water is exchanged heat, be further preheated；
In order to ensure heat exchange efficiency, flow losses are reduced, can be adjusted and high temperature according to the pressure in the vapour liquid separator 5 and liquid level
The raw material flow quantity of water heat exchange, the material liquid after being preheated is mixed with main road material liquid, and a point two-way respectively enters the described 3rd and changed
Hot device 9 and the 4th heat exchanger 10, and by reclaiming the product water of the outflow of evaporative condenser 1 and the waste heat of concentrate,
And then own temperature is further improved, then spray into flash distillation or heat absorption in the evaporative condenser 1 via the 3rd water pump 14
Evaporation produces the Low Temperature Steam that vapour is inhaled as the centrifugal compressor 2.
The condensed water produced in the evaporative condenser 1 is pumped out through the 4th water pump 16, is introduced into the 3rd heat exchange
Device 9, reclaims its waste heat and material liquid is preheated, afterwards into the fresh-water tank 6；Institute will be mixed using second water pump 17
The water at low temperature in the high-temperature water and the fresh-water tank 6 of vapour liquid separator 5 is stated, in the working chamber for spraying into the helical-lobe compressor 3, is used
In the cooling and the sealing for the endoluminal leak passage that works of compressed steam；In the case where injection flow rate is certain, the described 4th can be passed through
Regulating valve 37 and the 6th valve 38 regulate and control to injection water temperature.
Step 6：The treatment fluid concentration of the bottom of evaporative condenser 1 is raised because of the evaporation of water, is changed into concentrate, warp
5th water pump 15 pumps out rear part together with the material liquid after preheating, continues to spray into the participation of evaporative condenser 1 system
Circulation, can be controlled according to the bottom concentrate concentration of evaporative condenser 1 to the concentrated solution discharge for participating in system circulation；
Another part concentrate being pumped out enters the 4th heat exchanger 10, and reclaiming its waste heat is used for the preheating of material liquid, Zhi Houzhi
Run in or be collected as product.
Although present disclosure is as above, the present invention is not limited to this.Any those skilled in the art, are not departing from this
In the spirit and scope of invention, it can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
The scope of restriction is defined.
Claims (10)
1. a kind of function of mechanical steam recompression system, it is characterised in that：Including evaporative condenser (1), centrifugal compressor (2), screw rod
It is provided with the top of compressor (3), electric heater (4), vapour liquid separator (5) and fresh-water tank (6), the evaporative condenser (1)
Shower (1b) is provided with below filter screen (1a), the filter screen (1a), header tank is provided with below the shower (1b)
(1c) and the condenser pipe (1d) connected with the header tank (1c), the gas outlet of the header tank (1c) is provided with air bleeding valve (18)
With vavuum pump (12), the import of the shower (1b) passes through electric heater described in the pipeline connection provided with the first water pump (13)
(4) outlet, the evaporative condenser (1) connects import and the institute of the centrifugal compressor (2) by the venthole at the top of it
State and set successively on the import of helical-lobe compressor (3), the pipeline between the evaporative condenser (1) and the centrifugal compressor (2)
It is equipped with the first valve (22) and sluicing separator (11), the pipe between the evaporative condenser (1) and the helical-lobe compressor (3)
Be provided with the second valve (23) on road, the outlet of the centrifugal compressor (2) by be provided with material liquid preheating heat exchanger (7) and
The import of helical-lobe compressor (3) described in the pipeline connection of 3rd valve (25), the outlet of the helical-lobe compressor (3) is by setting
There is the import of helical-lobe compressor (3) described in the pipeline connection of the 4th valve (24), the outlet of the helical-lobe compressor (3) is also connected
The import of the vapour liquid separator (5), evaporative condenser (1) is described cold described in the outlet of the vapour liquid separator (5)
The import of solidifying pipe (1d), the material liquid import of the material liquid preheating heat exchanger (7) and the material liquid preheating heat exchanger (7)
The first regulating valve (26) is provided between material liquid outlet, the material liquid outlet of the material liquid preheating heat exchanger (7) is also distinguished
Pass through the pipeline provided with the 5th valve (27) and the material liquid of the heat exchanger of pipeline connection second (8) provided with the second regulating valve (28)
Outlet and the material liquid import of the second heat exchanger (8), the fresh water import of second heat exchanger (8) pass through provided with the 3rd regulating valve
(29) delivery port of vapour liquid separator described in pipeline connection (5), the fresh water import of second heat exchanger (8) is also by provided with
The water pump of pipeline connection second (17) of four regulating valves (37), the import of second water pump (17) is also by provided with the 6th valve
(38) delivery port of fresh-water tank (6) described in pipeline connection, helical-lobe compressor described in the outlet of second water pump (17)
(3) water-spraying control mouthful, the water outlet of second heat exchanger (8) passes through provided with light described in the 7th valve (30) pipeline connection
The water inlet of water tank (6), the material liquid outlet of second heat exchanger (8) is by being arranged in parallel the 3rd heat exchanger (9) and the
The import of the water pump (14) of pipeline connection the 3rd of four heat exchangers (10), evaporation described in the outlet of the 3rd water pump (14) is cold
The import of the shower (1b) of condenser (1), the delivery port of the header tank (1c) of the evaporative condenser (1) is by setting
There is the fresh water import of the 3rd heat exchanger (9) described in the pipeline connection of the 4th water pump (16) and by the 3rd heat exchanger (9)
Water outlet connects the fresh-water tank (6), and the concentrated solution outlet of evaporative condenser (1) bottom is provided with the 5th water pump
(15), the outlet of the 5th water pump (15) on the one hand passes through the 3rd water pump described in the pipeline connection provided with the 8th valve (34)
(14) import, is on the other hand entered by the concentrate of the 4th heat exchanger (10) described in the pipeline connection provided with the 9th valve (33)
Mouth and the concentrated solution outlet discharge for passing through the 4th heat exchanger (10).
2. a kind of function of mechanical steam recompression system according to claim 1, it is characterised in that：Electric heater (4) are entered
Mouth is additionally provided with the tenth valve (19).
3. a kind of function of mechanical steam recompression system according to claim 1, it is characterised in that：Evaporative condenser (1) top
The venthole in portion is additionally provided with the 11st valve (21).
4. a kind of function of mechanical steam recompression system according to claim 1, it is characterised in that：The water outlet of the header tank (1c)
The 12nd valve (36) is additionally provided between mouth and the 4th water pump (16).
5. a kind of function of mechanical steam recompression system according to claim 1, it is characterised in that：3rd heat exchanger (9)
Material liquid import and the material liquid import of the 4th heat exchanger (10) further respectively have the 13rd valve (31) and the 14th valve
Door (32).
6. a kind of function of mechanical steam recompression system according to claim 1, it is characterised in that：3rd water pump (14) are entered
Mouth is provided with the 15th valve (35), and the outlet of first water pump (13) is additionally provided with the 16th valve (20).
7. a kind of control method of the function of mechanical steam recompression system according to claim 1 to 6 any one, its feature exists
In comprising the following steps：
Step one：Start the vavuum pump (12) first to vacuumize system, and open the electric heater (4), when being
Hot water in system vacuum and the electric heater (4) is reached after requirement, starts first water pump (13), the electric heater
(4) hot water in sprays into the evaporative condenser (1) after pressurization by the shower (1b)；
Step 2：First valve (22) is closed, second valve (23) and the 4th valve (24) is opened, starts institute
State helical-lobe compressor (3), due to the evaporative condenser (1) middle position negative pressure, the hot water of penetrating can absorb self heat produce it is low
Warm flash steam, flash steam after the filter screen (1a) filters out droplets of feed by after the helical-lobe compressor (3) primary compression again
Enter the helical-lobe compressor (3) second compression again through the 4th valve (24), so circulation improves the quality of compressed steam
(flow and temperature)；
Step 3：The 4th valve (24) is closed, now the steam of high-quality enters the vapour liquid separator (5) by the road,
Subsequently into the condenser pipe (1d) of the evaporative condenser (1)；
Step 4：The vavuum pump (12) is closed, first valve (22) is opened, second valve (23) is closed, started
The centrifugal compressor (2), the steam of high-quality itself condenses into the condenser pipe (1d) and discharges heat afterwards so that by institute
The hot water for stating shower (1b) penetrating produces steam, and the steam carries out one stage of compression by the centrifugal compressor (2) suction, then
Two-stage compression is carried out through the helical-lobe compressor (3), the institute of the evaporative condenser (1) is entered through the vapour liquid separator (5)
Condenser pipe (1d) is stated, so circulation, the water produced is condensed by the condenser pipe (1d) and enters the header tank (1c), and do not had
The gas for having condensation then passes through the air bleeding valve (18) discharge system；
Step 5：The electric heater (4), first water pump (13) are closed, starts the 3rd water pump (14), now raw material
Liquid is by the material liquid preheating heat exchanger (7), second heat exchanger (8) and the 3rd heat exchanger (9) and described the
Four heat exchangers (10) preheated after by the 3rd water pump (14) be forced through the shower (1b) spray into it is described evaporation it is cold
Condenser (1), absorbs heat and produces steam.
Step 6：Spray into the evaporative condenser (1) but unevaporated concentration of raw material increases because of the evaporation of water, it is referred to as dense
Contracting liquid, according to different process requirement, it is necessary to be controlled to its concentration, concentrate is extracted out by water pump (15), according to its concentration,
Adjust the 8th valve (34), control enters the 3rd water pump (14) and continues to participate in the concentrated solution discharge of system circulation；It is remaining dense
Contracting liquid enters the 4th heat exchanger (10) preheating material liquid through the 9th valve (33), discharges or is collected as product afterwards.
8. a kind of control method of function of mechanical steam recompression system according to claim 7, it is characterised in that：The screw rod pressure
Contracting machine (3) in the process of running, delivery port and the fresh-water tank of second water pump (17) from the vapour liquid separator (5)
(6) delivery port draws water, and is entered after pressurization by the water-spraying control mouthful of the helical-lobe compressor (3) and is cooled down for it.
9. a kind of control method of function of mechanical steam recompression system according to claim 7, it is characterised in that：Described first adjusts
Save the aperture of valve (26) and the degree of superheat (vapor (steam) temperature and the steam pressure pair of material liquid preheating heat exchanger (7) outlet vapor
The saturation temperature difference answered) positive correlation.
10. a kind of control method of function of mechanical steam recompression system according to claim 7, it is characterised in that：Described second
The aperture of regulating valve (28) and the temperature positive correlation of the fresh water outlet of the vapour liquid separator (5) mouthful, the 4th regulating valve
(37) aperture and the temperature of the second water pump (17) import are negatively correlated, aperture and the vapour of the 3rd regulating valve (29)
The internal liquid level positive correlation of liquid/gas separator (5).
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| CN109876485A (en) * | 2019-03-11 | 2019-06-14 | 天津乐科节能科技有限公司 | Acetic acid recovery is from backheat rectifier unit and method |
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| CN114087189B (en) * | 2021-11-09 | 2023-11-17 | 中国石油化工股份有限公司 | Low-load starting system and starting method of oil-free screw compressor |
| CN114353364A (en) * | 2022-01-12 | 2022-04-15 | 西安交通大学 | High-temperature steam generation system and method |
| CN114623429A (en) * | 2022-03-22 | 2022-06-14 | 东方电气集团东方电机有限公司 | Micro-pressure steam recovery system and method |
| CN114623429B (en) * | 2022-03-22 | 2023-06-16 | 东方电气集团东方电机有限公司 | Micropressure steam recovery system and method |
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| CN116771712B (en) * | 2023-08-23 | 2023-10-24 | 中粮生化(成都)有限公司 | Anti-asthma driving system and method for centrifugal compressor |
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