CN104370313A - Sewage treatment plant based on mechanical recompression technique - Google Patents
Sewage treatment plant based on mechanical recompression technique Download PDFInfo
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- CN104370313A CN104370313A CN201410612540.5A CN201410612540A CN104370313A CN 104370313 A CN104370313 A CN 104370313A CN 201410612540 A CN201410612540 A CN 201410612540A CN 104370313 A CN104370313 A CN 104370313A
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- pump
- heat exchanger
- evaporating heat
- compressor
- vacuum
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000010865 sewage Substances 0.000 title abstract description 8
- 238000001704 evaporation Methods 0.000 claims abstract description 55
- 230000001105 regulatory effect Effects 0.000 claims abstract description 10
- 238000013461 design Methods 0.000 claims abstract description 8
- 238000005516 engineering process Methods 0.000 claims description 33
- 239000002699 waste material Substances 0.000 claims description 25
- 230000001276 controlling effect Effects 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 17
- 238000001514 detection method Methods 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 4
- 230000010365 information processing Effects 0.000 claims description 3
- 230000008020 evaporation Effects 0.000 abstract description 5
- 230000010455 autoregulation Effects 0.000 abstract 1
- 238000009835 boiling Methods 0.000 description 4
- 239000006200 vaporizer Substances 0.000 description 3
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000026676 system process Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- C02F1/041—Treatment of water, waste water, or sewage by heating by distillation or evaporation by means of vapour compression
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention relates to a sewage treatment plant based on mechanical recompression technique, which comprises a separator, an evaporation heat exchanger, a circulating pump, a feed pump, a vacuum pump, a compressor and a condensate pump. The sewage treatment plant is also provided with a control system, wherein the control system comprises a PLC (programmable logic controller) control station; the PLC control station is connected with a touch screen and an I/O expansion module through control lines; and the I/O expansion module is respectively connected with a steam regulating valve, the circulating pump, the compressor, the condensate pump, a feed regulating valve of the feed pump and a vacuum regulating valve of the vacuum pump through signal lines. The sewage treatment plant has the advantages of reasonable structural design and high operability, and can effectively implement sewage treatment. The sewage treatment plant can automatically regulate the motor frequency and feed rate according to the evaporation capacity, thereby implementing unmanned control state in deed and automatic control, and achieving the goals of energy saving and emission reduction by dynamic equilibrium, frequency autoregulation and other techniques.
Description
Technical field
The present invention relates to a kind of waste disposal plant, particularly a kind of waste disposal plant based on mechanical recompression technology.
Background technology
Current function of mechanical steam recompression sewage treatment control system processes mainly for the trade effluent of chemical plant emission.Treatment unit common at present with all need to consume huge energy, be unfavorable for energy saving.Current development high-level efficiency, oligosaprobic evaporation process technology has very large necessity.
Function of mechanical steam recompression is by the steam of single-effect evaporation through compressor second compression again, and temperature, force value improve, and heat content increases, and then enters interchanger condensation, to make full use of the latent heat of steam.Domestic this kind of technology belongs to emerging sunrise industry, and a lot of industrial enterprise, because the energy, discharge etc. require necessary energy-conservation and result of use all well MVR system above, can say that prospect is very wide.
The control of current vapo(u)rization system is mainly by experience Non-follow control.
Main drawback is: 1, require that difficulty is high for operator, must grasp necessary experimental technology;
2, easily because misoperation, the system fault is caused;
3, cannot self-regulation motor rotating speed, cause energy dissipation;
4, unattended operation can not be realized.
Summary of the invention
Technical problem to be solved by this invention is for the deficiencies in the prior art, provides a kind of waste disposal plant based on mechanical recompression technology that a kind of structure design is more reasonable, stable efficiently, energy consumption is low.
Technical problem to be solved by this invention is realized by following technical scheme.The present invention is a kind of waste disposal plant based on mechanical recompression technology, is characterized in:
This device comprises separator, evaporating heat exchanger, recycle pump, fresh feed pump, vacuum pump, compressor and condensate pump; Be connected with the feeding pipe be connected with evaporating heat exchanger tube side bottom described evaporating heat exchanger, fresh feed pump is located on feeding pipe; Be provided with liquid circulation line between evaporating heat exchanger and separator bottom, recycle pump is located on liquid circulation line; Compressor is connected with supply air line, and the other end of supply air line is connected on the middle part of evaporating heat exchanger, is connected with liquid returning tube road before the top of evaporating heat exchanger and separator, and evaporating heat exchanger tube side, separator and recycle pump form loop; Separator internal upper part is provided with the vapor recovery pipeline leading to compressor; Supply air line is provided with steam regulating valve;
The shell side of evaporating heat exchanger is connected with vacuum-lines, and vacuum pump is located on vacuum-lines; The shell side of evaporating heat exchanger is also connected with condenser pipe, and condensate pump is located on condenser pipe;
This device is also provided with Controlling System, described Controlling System comprises PLC control station, PLC control station is connected with touch-screen and I/O expansion module with by control line, and I/O expansion module is connected with the charging variable valve of steam regulating valve, recycle pump, compressor, condensate pump, fresh feed pump, the vacuum breaker of vacuum pump respectively by signal wire.
Technical problem to be solved by this invention can also be realized further by following technical scheme.Above-described a kind of waste disposal plant based on mechanical recompression technology, is characterized in: on condenser pipe, be also provided with condensate draining.
Technical problem to be solved by this invention can also be realized further by following technical scheme.Above-described a kind of waste disposal plant based on mechanical recompression technology, is characterized in: on supply air line, be provided with negative-pressure detection device; Described detection of negative pressure mechanism is arranged on channel bend place, is made up of proximity switch, catch and stationary installation; Described proximity switch is installed towards steam direction, and catch is fixedly mounted on the sidepiece of proximity switch by stationary installation.
Technical problem to be solved by this invention can also be realized further by following technical scheme.Above-described a kind of waste disposal plant based on mechanical recompression technology, is characterized in: this device utilizes PID control method; System adopts the vacuum tightness feedback parameter of evaporating heat exchanger to be input parameter, in order to characterize the current state of evaporating heat exchanger; With vacuum tightness variable valve for controlling performer, select to control required vacuum tightness according to the operating requirement of system.
Technical problem to be solved by this invention can also be realized further by following technical scheme.Above-described a kind of waste disposal plant based on mechanical recompression technology, is characterized in: this device realizes smooth running by the balance controlling steam output and inlet amount, makes the liquid level in evaporating pot keep relative constancy; The frequency values needing vapour compressor is calculated by the inlet air temperature and target feed air temperature of measuring compressor.
Technical problem to be solved by this invention can also be realized further by following technical scheme.Above-described a kind of waste disposal plant based on mechanical recompression technology, be characterized in: described PLC control station uses modular design, mainly comprise following functions block: system initialization module, signals collecting, processing module, system control module, receives information, sending module, and alarm information processing module.
Technical problem to be solved by this invention can also be realized further by following technical scheme.Above-described a kind of waste disposal plant based on mechanical recompression technology, is characterized in: described PLC control station adopts network interface and upper computer to carry out communication, and the key message of unit is sent to administrator computer; System I/O expansion module comprises two AI inputs, DI input, a DO export and an AO output.
In apparatus of the present invention, the control core of Controlling System is exactly boiling in evaporating heat exchanger.Steam regulating valve to be opened in evaporating heat exchanger and is logically steam heated to design temperature, opens vacuum pump and makes vacuum tightness constant about set(ting)value by adjustment vacuum breaker.Now in evaporating heat exchanger, liquid comes to life, and the steam part that boiling produces enters separator cooling and produces water of condensation, and other compress through compressor, and pressure, temperature raise, and enters heating liquid in evaporating heat exchanger and makes it keep boiling.Such evaporating heat exchanger and separator just constitute the working cycle of a running balance.Controlling System ensures temperature, vacuum tightness, the liquid level relative constancy of evaporating heat exchanger.The vapor temperature that the frequency of compressor is then come according to evaporating heat exchanger controls, and ensures the homo(io)thermism of compressor outlet.System can steady operation, and power consumption significantly reduces simultaneously.
The control software design that the present invention uses can adopt module design, takes Open-closed-loop to combine and the control strategy such as fuzzy.For ease of test adjustment, ECU also leaves communication port and outer computer carries out communication, by computer installation control command or can send data to computer, so that data store, process and analyze.
The present invention selects programmable control module PLC to control, its integrated level is high, reliable in quality, advanced technology, expansion are convenient, industrial bus and network communication interface are provided, can be connected with computer, touch-screen and other industry control smart machine easily, be completed the measurement of signal and the control tasks to the production unit such as variable valve, motor such as each temperature, pressure, flows by touch-screen.PLC is contacted by industrial field bus and master control station, completes whole control process.
The present invention adopts evaporating heat exchanger vacuum tightness automatic adjustment technology, utilizes PID control techniques, draws project data by test in place, draws correlation formula and control algolithm.System adopts the vacuum tightness feedback parameter of evaporating pot to be input parameter, in order to characterize the current state of evaporating pot; With vacuum tightness variable valve for controlling performer, select to control required vacuum tightness according to the operating requirement of system.Because the speed of vacuum pump vacuum is much slower than the speed compared with entering evaporating pot in air, so pid parameter adopts different parameters when the different error amount of various process.Ensure that evaporating pot can obtain the vacuum tightness of relative constancy, whole system smooth running.
Apparatus of the present invention adopt dynamic balance control technique, and system cloud gray model steadily must control the balance of steam output and inlet amount, make the liquid level in evaporating pot keep relative constancy.Also need in this process to consider that charging can not once be thrown in too much, cause temperature in evaporating pot to drop to below boiling point.The frequency values needing vapour compressor is calculated by the inlet air temperature and target feed air temperature of measuring vapour compressor.The energy balance in vaporization cycle is maintained, the electric energy of consumes least under the prerequisite of guarantee evaporation effect in this process.Material in vaporizer in control process, energy are in the state of relative equilibrium, realize the stability for the treatment of processes.
Vapour compressor low power consumpting state of the present invention automatically resets technology.By detecting the negative-pressure detection device of supply air line, judge whether system is in low power consumpting state (compressor is actual in surge), if be in low power consumpting state, represent because in vaporizer steam not pedal system cannot carry out normal processing.By controlling vacuum tightness variable valve, vacuum tightness is improved this value of 10%(adjustable).Judge afterwards after a time, if still do not recover normal compressed state, then logical steam heating liquid in vaporizer, makes the normal compressed state of system recovery.Steam can move by direction as shown after compressor, and now catch can move to the left.If compressor is not because have enough steam to produce surge, air-flow can to motion in the other direction, and catch is close proximity switch under airflow function.This device sends signal to system, and indicating system is in low power consumpting state.
Compared with prior art, advantage of the present invention and technique effect as follows:
(1) apparatus of the present invention reasonable in design, workable, effectively can realize sewage disposal;
(2) apparatus of the present invention can regulate electric machine frequency and inlet amount automatically according to steam output, accomplish the state of a control of real unattended duty, achieve automatic control.
(3) apparatus of the present invention can realize the target of energy-saving and emission-reduction by technology such as running balance, frequency regulate automatically.
(4) the present invention adopts compressor safety control technology, achieves apparatus system safety, stability contorting.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of the present invention;
Fig. 2 is the control schematic block diagram of Controlling System of the present invention;
Fig. 3 is the structural representation of negative-pressure detection device.
Embodiment
Referring to accompanying drawing, further describe concrete technical scheme of the present invention, so that those skilled in the art understands the present invention further, and do not form the restriction to its right.
Embodiment 1, with reference to Fig. 1-2, a kind of waste disposal plant based on mechanical recompression technology:
This device comprises separator 6, evaporating heat exchanger 1, recycle pump 2, fresh feed pump 12, vacuum pump 10, compressor 5 and condensate pump 11; Be connected with the feeding pipe be connected with evaporating heat exchanger 1 tube side bottom described evaporating heat exchanger 1, fresh feed pump 12 is located on feeding pipe; Be provided with liquid circulation line 3 between bottom evaporating heat exchanger 1 and separator 6, recycle pump 2 is located on liquid circulation line 3; Compressor 5 is connected with supply air line 8, and the other end of supply air line 8 is connected on the middle part of evaporating heat exchanger 1, and be connected with liquid returning tube road 7 before the top of evaporating heat exchanger 1 and separator 6, evaporating heat exchanger 1 tube side, separator 6 and recycle pump 2 form loop; Separator 6 internal upper part is provided with the vapor recovery pipeline 4 leading to compressor 5; Supply air line 8 is provided with steam regulating valve;
The shell side of evaporating heat exchanger 1 is connected with vacuum-lines 9, vacuum pump 10 is located on vacuum-lines 9; The shell side of evaporating heat exchanger 1 is also connected with condenser pipe 14, and condensate pump 11 is located on condenser pipe 14;
This device is also provided with Controlling System, described Controlling System comprises PLC control station, PLC control station is connected with touch-screen and I/O expansion module with by control line, and I/O expansion module is connected with the charging variable valve of steam regulating valve, recycle pump 2, compressor 5, condensate pump 11, fresh feed pump 12, the vacuum breaker of vacuum pump 10 respectively by signal wire.
Embodiment 2, in a kind of waste disposal plant based on mechanical recompression technology described in embodiment 1: be also provided with condensate draining 13 on condenser pipe 14.
Embodiment 3, in a kind of waste disposal plant based on mechanical recompression technology described in embodiment 1 or 2: be provided with negative-pressure detection device on supply air line 8; Described detection of negative pressure mechanism is arranged on channel bend place, is made up of proximity switch 82, catch 81 and stationary installation 83; Described proximity switch 82 is installed towards steam direction, and catch 81 is fixedly mounted on the sidepiece of proximity switch 82 by stationary installation 83.
Embodiment 4, in a kind of waste disposal plant based on mechanical recompression technology of embodiment 1-3 described in any one: this device utilizes PID control method; System adopts the vacuum tightness feedback parameter of evaporating heat exchanger to be input parameter, in order to characterize the current state of evaporating heat exchanger; With vacuum tightness variable valve for controlling performer, select to control required vacuum tightness according to the operating requirement of system.
Embodiment 5, in a kind of waste disposal plant based on mechanical recompression technology of embodiment 1-4 described in any one: this device realizes smooth running by the balance controlling steam output and inlet amount, makes the liquid level in evaporating pot keep relative constancy; The frequency values needing vapour compressor is calculated by the inlet air temperature and target feed air temperature of measuring compressor.
Embodiment 6, in a kind of waste disposal plant based on mechanical recompression technology of embodiment 1-5 described in any one: described PLC control station uses modular design, mainly comprise following functions block: system initialization module, signals collecting, processing module, system control module, receives information, sending module, and alarm information processing module.
Embodiment 7, in a kind of waste disposal plant based on mechanical recompression technology of embodiment 1-6 described in any one: described PLC control station adopts network interface and upper computer to carry out communication, and the key message of unit is sent to administrator computer; System I/O expansion module comprises two AI inputs, DI input, a DO export and an AO output.
Claims (7)
1., based on a waste disposal plant for mechanical recompression technology, it is characterized in that:
This device comprises separator, evaporating heat exchanger, recycle pump, fresh feed pump, vacuum pump, compressor and condensate pump; Be connected with the feeding pipe be connected with evaporating heat exchanger tube side bottom described evaporating heat exchanger, fresh feed pump is located on feeding pipe; Be provided with liquid circulation line between evaporating heat exchanger and separator bottom, recycle pump is located on liquid circulation line; Compressor is connected with supply air line, and the other end of supply air line is connected on the middle part of evaporating heat exchanger, is connected with liquid returning tube road before the top of evaporating heat exchanger and separator, and evaporating heat exchanger tube side, separator and recycle pump form loop; Separator internal upper part is provided with the vapor recovery pipeline leading to compressor; Supply air line is provided with steam regulating valve;
The shell side of evaporating heat exchanger is connected with vacuum-lines, and vacuum pump is located on vacuum-lines; The shell side of evaporating heat exchanger is also connected with condenser pipe, and condensate pump is located on condenser pipe;
This device is also provided with Controlling System, described Controlling System comprises PLC control station, PLC control station is connected with touch-screen and I/O expansion module with by control line, and I/O expansion module is connected with the charging variable valve of steam regulating valve, recycle pump, compressor, condensate pump, fresh feed pump, the vacuum breaker of vacuum pump respectively by signal wire.
2. a kind of waste disposal plant based on mechanical recompression technology according to claim 1, is characterized in that: on condenser pipe, be also provided with condensate draining.
3. a kind of waste disposal plant based on mechanical recompression technology according to claim 1, is characterized in that: on supply air line, be provided with negative-pressure detection device; Described detection of negative pressure mechanism is arranged on channel bend place, is made up of proximity switch, catch and stationary installation; Described proximity switch is installed towards steam direction, and catch is fixedly mounted on the sidepiece of proximity switch by stationary installation.
4., according to a kind of waste disposal plant based on mechanical recompression technology of claim 1-3 described in any one, it is characterized in that: this device utilizes PID control method; System adopts the vacuum tightness feedback parameter of evaporating heat exchanger to be input parameter, in order to characterize the current state of evaporating heat exchanger; With vacuum tightness variable valve for controlling performer, select to control required vacuum tightness according to the operating requirement of system.
5. according to a kind of waste disposal plant based on mechanical recompression technology of claim 1-3 described in any one, it is characterized in that: this device realizes smooth running by the balance controlling steam output and inlet amount, make the liquid level in evaporating pot keep relative constancy; The frequency values needing vapour compressor is calculated by the inlet air temperature and target feed air temperature of measuring compressor.
6. according to a kind of waste disposal plant based on mechanical recompression technology of claim 1-3 described in any one, it is characterized in that: described PLC control station uses modular design, mainly comprise following functions block: system initialization module, signals collecting, processing module, system control module, receives information, sending module, and alarm information processing module.
7. according to a kind of waste disposal plant based on mechanical recompression technology of claim 1-3 described in any one, it is characterized in that: described PLC control station adopts network interface and upper computer to carry out communication, and the key message of unit is sent to administrator computer; System I/O expansion module comprises two AI inputs, DI input, a DO export and an AO output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410612540.5A CN104370313B (en) | 2014-11-05 | 2014-11-05 | A kind of sewage-treatment plant based on mechanical recompression technology |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410612540.5A CN104370313B (en) | 2014-11-05 | 2014-11-05 | A kind of sewage-treatment plant based on mechanical recompression technology |
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| CN104370313A true CN104370313A (en) | 2015-02-25 |
| CN104370313B CN104370313B (en) | 2017-07-11 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104848284A (en) * | 2015-04-09 | 2015-08-19 | 宜诺珐玛（天津）科技有限公司 | Steam condensation water heat recovery method and device |
| CN107918345A (en) * | 2016-10-08 | 2018-04-17 | 航天晨光股份有限公司 | A kind of nuclear power MVR automation control systems and its control method |
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| CN104370313B (en) | 2017-07-11 |
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