CN113087055A - Multi-point vacuum pumping system and multi-point vacuum pumping method for low-temperature multi-effect seawater desalination device - Google Patents
Multi-point vacuum pumping system and multi-point vacuum pumping method for low-temperature multi-effect seawater desalination device Download PDFInfo
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- 239000013535 sea water Substances 0.000 title claims abstract description 99
- 238000010612 desalination reaction Methods 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005086 pumping Methods 0.000 title claims description 64
- 239000000498 cooling water Substances 0.000 claims description 25
- 230000000694 effects Effects 0.000 claims description 21
- 238000011084 recovery Methods 0.000 claims description 8
- 230000003584 silencer Effects 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 25
- 230000008569 process Effects 0.000 description 11
- 238000011033 desalting Methods 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
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- 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
- C02F1/043—Details
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- 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
- C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/06—Pressure conditions
- C02F2301/063—Underpressure, vacuum
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
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Abstract
The invention belongs to the technical field of seawater desalination, and provides a multi-point vacuumizing system and a multi-point vacuumizing method for a low-temperature multi-effect seawater desalination device.
Description
Technical Field
The invention relates to the technical field of seawater desalination, in particular to a multi-point vacuum pumping system and a multi-point vacuum pumping method for a low-temperature multi-effect seawater desalination device.
Background
The low-temperature multi-effect seawater desalination production process is a mainstream technical scheme for desalinating seawater to produce water at present internationally and domestically. Usually, a combined thermal power generator set adopts a 'water and electricity cogeneration' mode, steam is pumped into a seawater desalination device by utilizing a steam turbine of the power generator set, and seawater is heated in a vacuum environment in the system, so that a production process of distilling desalinated water at a temperature lower than the normal seawater evaporation temperature is obtained. The seawater desalination system utilizes a conventional vacuumizing system to pump out gas in the system, so that the system is always operated in a vacuum negative pressure state, and seawater is evaporated at about 70 ℃ under the condition of steam heating to generate fresh water. During operation, the inclusion of partially non-condensable gases may affect heat transfer efficiency and cause corrosion; during standby, oxidation corrosion is easily formed inside system equipment, so that the inner wall of an effect body, a heat exchange pipeline, a bolt and the like are corroded, and the service life of the equipment is shortened.
The vacuum pumping system of the existing low-temperature multi-effect seawater desalination system usually adopts a device for performing vacuum pumping by a steam ejector, and the main principle is that steam with certain pressure is ejected at supersonic speed through a Laval nozzle, the pressure energy is converted into velocity energy, negative pressure is formed at the outlet of the nozzle due to the ejection effect of high-speed airflow, gas in the system is sucked out, and the continuous stable vacuum effect can be realized in the operation process of the system through the operation of the vacuum pumping system. Two sets of low-temperature multi-effect seawater desalination devices are generally adopted by vacuum pumping systems, wherein one set of the low-temperature multi-effect seawater desalination devices is used for starting and vacuumizing at the early stage, and the other set of the low-temperature multi-effect seawater desalination devices is used for keeping vacuum during system operation. Generally, two sets of systems are used independently, steam is introduced in the vacuumizing process and is directly discharged, the noise is high, certain influence is brought to the surrounding environment, and a large amount of temperature reduction water is used in the vacuumizing process, so that energy waste is caused. In winter operation, in order to prevent the pipeline from freezing, desuperheating water cannot be added during the vacuumizing of the system, and the safe and stable operation of the vacuumizing system is seriously influenced.
The following problems exist in the prior art:
1. the existing low-temperature multi-effect seawater desalination device adopts two or more sets of vacuum pumping systems which usually cannot be used for mutual standby, the occupied space is large, the system is complex in arrangement, the operation and maintenance cost is high, the operation and operation are complicated, and when one of the vacuum pumping systems has a fault or insufficient output, complementation cannot be realized, so that the seawater desalination device cannot maintain operation, and the safety risk of system operation is increased.
2. The vacuum system of the existing low-temperature multi-effect seawater desalination device is generally provided with two-stage or three-stage ejectors which work independently and are connected in series to form energy level ladder joint work, and when the low-temperature multi-effect seawater desalination device runs for a long time and the vacuum leakage is large, the set vacuum degree can not be maintained due to insufficient output of a vacuum pumping system, so that the seawater desalination device can not be maintained to run and stop running.
3. The existing low-temperature multi-effect seawater desalination device is often provided with a single vacuumizing access point, and only by arranging a single main equipment pipeline to be connected with a vacuumizing system, the vacuum degree of each part in the seawater desalination device is maintained unbalanced to have certain deviation, so that the operation stability of the system and the water making ratio of water production are influenced.
4. The existing low-temperature multi-effect seawater desalination device vacuumizing system is not provided with a regulating valve or only provided with a manual control valve, and the balanced vacuum degree of each part of the seawater desalination device cannot be maintained by freely regulating the opening of the valve according to the actual vacuum state of each effect evaporator in the vacuumizing process.
5. The existing low-temperature multi-effect seawater desalination device only feeds back the vacuum condition of the whole system by setting one or two vacuum degree detection measuring points, and the vacuum condition of each effect evaporator cannot be accurately monitored, so that the output state of a vacuum pumping system cannot be accurately adjusted in real time.
6. The vacuum pumping system of the existing low-temperature multi-effect seawater desalination device can only adjust the output range by adjusting the steam inlet amount entering the ejector of the vacuum pumping system, has small adjustment range, low vacuum pumping efficiency and poor actual applicability, and can not realize the adjustment range of the vacuum pumping output of the system according to the vacuum output state of a certain ejector of the independent pumping control vacuum system.
7. The automatic degree of the vacuum pumping system of the existing low-temperature multi-effect seawater desalination device is low, the steam inlet quantity of the vacuum pumping system is required to be manually adjusted according to feedback data of a vacuum degree measuring point of the seawater desalination device, and the logical automatic adjusting process of a control system cannot be realized.
8. The existing low-temperature multi-effect seawater desalination device generates larger noise and residual steam in the process of vacuumizing operation of a vacuumizing system, influences the working environment of operating personnel and the noise index of a factory boundary, and simultaneously causes certain influence on the surrounding ecological environment of a factory area.
Disclosure of Invention
The invention provides a multi-point vacuumizing system and a multi-point vacuumizing method for a low-temperature multi-effect seawater desalting device, and aims to solve the technical problems that two or more vacuumizing systems of the existing low-temperature multi-effect seawater desalting device can not be used for mutual standby generally, the system is complex in arrangement, high in operation and maintenance cost, complex in operation and operation, large in occupied space, small in adjusting range, low in vacuum vacuumizing efficiency, single in vacuumizing access point and low in automatic control degree.
The multi-point vacuum pumping system of the low-temperature multi-effect seawater desalination device comprises: the system comprises a first-stage vacuum air extractor, a second-stage vacuum air extractor, a third-stage vacuum air extractor, a fourth-stage vacuum air extractor, a fifth-stage vacuum air extractor, a first-stage vacuum cooler, a second-stage vacuum cooler, a third-stage vacuum cooler, a vacuum silencer, a steam input pipeline, a cooling water recovery pipeline, a main equipment vacuum access pipeline, an auxiliary equipment vacuum access pipeline, a vacuum measuring point controller and an effect body vacuum control valve, wherein the input end of the first-stage vacuum air extractor is connected with the main equipment vacuum access pipeline, the output end of the first-stage vacuum air extractor is respectively connected with the auxiliary equipment vacuum access pipeline and the input end of the first-stage vacuum cooler through a T-shaped connecting pipe, the output end of the first-stage vacuum cooler is connected with the input end of the second-stage vacuum air extractor, the output end of the second-stage vacuum air extractor is connected with the input end of the second-stage, the output end of the second-stage vacuum cooler is connected with the input end of a third-stage vacuum air extractor, the output end of the third-stage vacuum air extractor is connected with the input end of a third-stage vacuum cooler, the output end of the third-stage vacuum cooler is connected with the input end of a fourth-stage vacuum air extractor, the output end of the fourth-stage vacuum air extractor is connected with the input end of a fifth-stage vacuum air extractor, the output end of the fifth-stage vacuum air extractor is connected with the input end of a vacuum silencer, the upper ends of the first-stage vacuum air extractor, the second-stage vacuum air extractor, the third-stage vacuum air extractor, the fourth-stage vacuum air extractor and the fifth-stage vacuum air extractor are respectively communicated with a steam input pipeline through pipelines, the upper ends of the first-stage vacuum cooler, the second-stage vacuum cooler and the third-stage vacuum cooler are respectively communicated with a cooling water recovery pipeline through pipelines, and the lower ends of the first-stage vacuum cooler, the second-stage vacuum cooler and the third The pipeline is communicated, the plurality of vacuum measuring point controllers are respectively and independently arranged on main equipment and auxiliary equipment of the seawater desalination device, and the plurality of effect body vacuum control valves are respectively arranged on the vacuum pumping pipelines of the main equipment and the auxiliary equipment.
Furthermore, a non-condensing gas flowmeter and a one-way control valve are arranged on a connecting pipeline between the third stage vacuum cooler and the fourth stage vacuum ejector.
Furthermore, a first-stage air extractor control valve is arranged above the first-stage vacuum air extractor, the first-stage air extractor control valve is positioned on a pipeline communicated with the steam input pipeline of the first-stage vacuum air extractor, a second-stage air extractor control valve is arranged above the second-stage vacuum air extractor, the second-stage air extractor control valve is positioned on a pipeline communicated with the steam input pipeline of the second-stage vacuum air extractor, a third-stage air extractor control valve is arranged above the third-stage vacuum air extractor, the third-stage air extractor control valve is positioned on a pipeline communicated with the steam input pipeline of the third-stage vacuum air extractor, the input end of the fourth-stage vacuum air extractor is connected with a fourth-stage air extractor control valve, the fourth-stage air extractor control valve is positioned on a pipeline communicated with the steam input pipeline of the fourth-stage vacuum air extractor, and a fifth-stage air extractor control valve is arranged above the fifth-stage vacuum air extractor, and the fifth-stage air extractor control valve is positioned on a pipeline which is communicated with the steam input pipeline of the fifth-stage vacuum air extractor.
Further, a first-stage cooler flow meter and a first-stage cooler control valve are sequentially arranged below the first-stage vacuum cooler, the first-stage cooler flow meter and the first-stage cooler control valve are positioned on a pipeline communicated with the cooling water input pipeline of the first-stage vacuum cooler, a second-stage cooler flow meter and a second-stage cooler control valve are sequentially arranged below the second-stage vacuum cooler, the second-stage cooler flow meter and the second-stage cooler control valve are positioned on a pipeline communicated with the cooling water input pipeline of the second-stage vacuum cooler, a third-stage cooler flow meter and a third-stage cooler control valve are sequentially arranged below the third-stage vacuum cooler, and the third-stage cooler flow meter and the third-stage cooler control valve are positioned on a pipeline communicated with the cooling water input pipeline of the third-stage vacuum cooler.
The multipoint vacuum pumping method of the multipoint vacuum pumping system of the low-temperature multi-effect seawater desalination device comprises the following specific steps:
s1: the seawater desalination device is started at the initial stage, the vacuum conditions of the main equipment and the auxiliary equipment are monitored by the vacuum measuring point controller, the multistage vacuumizing device control system is automatically put into operation to operate the first-stage vacuum air ejector, the second-stage vacuum air ejector, the third-stage vacuum air ejector, the fourth-stage vacuum air ejector and the fifth-stage vacuum air ejector, the opening degree of the air ejector control valve at the inlet end of each stage of vacuum air ejector is automatically adjusted according to the vacuum pumping quantity, and meanwhile, the opening degrees of the first-stage cooler control valve, the second-stage cooler control valve and the third-stage cooler control valve are automatically controlled by the control system according to the steam quantity entering the first-stage vacuum cooler, the second-stage vacuum cooler and the third-stage vacuum cooler through the first-stage cooler flow meter, the second-stage cooler flow meter and the third-stage cooler.
S2: during the operation of the seawater desalting device, the multistage vacuumizing device control system monitors the vacuum conditions of main equipment and auxiliary equipment according to the vacuum measuring point controller, automatically exits the operation states of the fourth-stage vacuum air extractor and the fifth-stage vacuum air extractor, closes the fourth-stage air extractor control valve and the fifth-stage air extractor control valve, only monitors the operation states of part or all of vacuum leakage amount by the vacuum measuring point controller, and automatically operates the first-stage vacuum air extractor, the second-stage vacuum air extractor and the third-stage vacuum air extractor by matching with the first-stage vacuum cooler, the second-stage vacuum cooler and the third-stage vacuum cooler, and automatically controls the first-stage cooler control valve by the control system according to the steam amount entering the first-stage vacuum cooler, the second-stage vacuum cooler and the third-stage vacuum cooler, The opening degree of the second-stage cooler control valve and the third-stage cooler control valve maintains the low-efficiency operation state of the vacuum pumping system of the seawater desalination device.
S3: during the off-stream period of the seawater desalination device, the multistage vacuumizing device control system closes the third-stage air extractor control valve, the second-stage air extractor control valve and the first-stage air extractor control valve step by step, and meanwhile, the first-stage cooler flow meter, the second-stage cooler flow meter and the third-stage cooler flow meter automatically control the opening degrees of the first-stage cooler control valve, the second-stage cooler control valve and the third-stage cooler control valve by the control system according to the steam amount entering the first-stage vacuum cooler, the second-stage vacuum cooler and the third-stage vacuum cooler, so that the standby cooling requirement of the multistage vacuumizing system is met.
Further, step S2 further includes the steps of:
s2 a: when the vacuum leakage amount of the seawater desalination device is increased due to faults or leakage points, the multistage vacuumizing device control system automatically controls the operation state of the fourth-stage vacuum air extractor or the fourth-stage vacuum air extractor and the fifth-stage vacuum air extractor to be independently or simultaneously put according to the feedback vacuum fluctuation condition of the main device and the auxiliary device monitored by the vacuum measuring point controller and the discharge flow change of the non-condensable gas monitored by the non-condensable gas flowmeter, so that the high-efficiency operation state of the vacuumizing system of the seawater desalination device is maintained.
Further, in step S3, a one-way control valve is disposed at the outlet of the third stage vacuum cooler to avoid vacuum fluctuation caused by external air not being sucked into the seawater desalination apparatus during the shutdown of the vacuum pumping system.
The invention has the beneficial effects that:
compared with the prior art, the invention has the following advantages and effects:
1. the invention adopts a multi-point vacuumizing mode to feed back and automatically regulate and control the opening of the vacuumizing valve through the independently arranged vacuum measuring points in the seawater desalting device equipment, maintains the vacuum balance degree of the whole seawater desalting device vacuumizing system pipeline, and effectively ensures the stable vacuum operation of the seawater desalting device.
2. The invention adopts a set of multi-stage vacuum pumping system, has small floor area, simple system arrangement, low operation and maintenance cost, gradual operation and operation, high automation degree and wide output regulation range, automatically controls the vacuum pumping quantity according to the feedback vacuum fluctuation condition of the main equipment and the auxiliary equipment monitored by the vacuum measuring point controller and the discharge flow change of the non-condensed gas monitored by the non-condensed gas flowmeter, maintains the vacuum stability of the seawater desalination device, and reduces the safe operation risk of the system.
3. According to the invention, five-stage or five-stage ejectors which work independently are arranged and connected in series to form energy level ladder work together, when the low-temperature multi-effect seawater desalination device runs for a long time and the vacuum leakage rate is large, the multistage vacuumizing system can automatically distribute and control the operation state of the ejectors at all stages according to the vacuum measuring point controllers arranged in the main equipment and the auxiliary equipment, so that the stable running state of the vacuumizing system of the seawater desalination device is maintained.
4. The invention adopts a multi-stage vacuumizing device control system which is respectively in controllable connection with a first-stage air extractor control valve, a second-stage air extractor control valve, a third-stage air extractor control valve, a fourth-stage air extractor control valve, a fifth-stage air extractor control valve, a first-stage cooler flow meter, a second-stage cooler control valve, a second-stage cooler flow meter, a third-stage cooler control valve, a third-stage cooler flow meter, a vacuum measuring point controller, an effect body vacuum control valve, a non-condensing gas flow meter and the like, and automatically controls and adjusts the vacuum pumping quantity according to a logic control program of a vacuumizing system, thereby realizing the accurate, automatic and stable vacuumizing process of the seawater desalting device.
5. The vacuum measuring point controllers are respectively and independently arranged at the fixed ends of the main equipment and the auxiliary equipment of the seawater desalination device, the vacuum degrees of the main equipment and the auxiliary equipment are monitored in real time, and monitoring data are fed back to the control system in real time and are used for automatically adjusting and controlling the operation state of each stage of vacuum air extractor and the opening degree of an inlet control valve of each stage of vacuum air extractor, and the balanced vacuum degrees of all parts of the seawater desalination device are automatically maintained.
6. The multistage vacuumizing device control system automatically controls the independent operation of the fourth-stage vacuum air extractor or the simultaneous operation of the fourth-stage vacuum air extractor and the fifth-stage vacuum air extractor according to the feedback vacuum fluctuation condition of the main equipment and the auxiliary equipment monitored by the vacuum measuring point controller and the discharge flow change of the non-condensed gas monitored by the non-condensed gas flowmeter, and maintains the high-efficiency operation state of the vacuumizing system of the seawater desalting device.
7. The invention is provided with effect body vacuum control valves which are respectively arranged on the main equipment vacuum pumping pipelines and the auxiliary equipment vacuum pumping pipelines and are used for adjusting the opening of the valve according to the instruction of a control system to assist in balancing and adjusting the vacuum degrees of the main equipment and the auxiliary equipment.
8. The extraction end of the first-stage vacuum air extractor is connected with the vacuum access port of the main equipment, so that a stable vacuum-pumping effect is provided for the main equipment of the seawater desalination device; the outlet end of the first-stage vacuum air ejector is fixedly connected with the vacuum access port of the auxiliary equipment, and a stable vacuumizing effect is provided for the auxiliary equipment of the seawater desalination device through the subsequent vacuum air ejectors at all stages.
9. The one-way control valve is arranged at the steam side outlet end of the third-stage cooler and is used for regulating the one-way flow of the fluid, so that the fluctuation of the vacuum degree caused by the fact that external gas is sucked into the seawater desalination device when the vacuum pumping system is stopped or fails is avoided.
10. The invention arranges a vacuum silencer at the outlet end of the fifth-stage vacuum air extractor of the multi-stage vacuum extractor, which is used for eliminating the noise generated by steam jet in the working process of the vacuum-pumping system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of the overall system of the present invention;
wherein:
a first stage vacuum air ejector-1, a second stage vacuum air ejector-2, a third stage vacuum air ejector-3, a fourth stage vacuum air ejector-4, a fifth stage vacuum air ejector-5, a first stage vacuum cooler-6, a second stage vacuum cooler-7, a third stage vacuum cooler-8, a vacuum muffler-9, a steam input pipeline-21, a cooling water input pipeline-22, a cooling water recovery pipeline-23, a main equipment vacuum input pipeline-24, an auxiliary equipment vacuum input pipeline-25, a vacuum measuring point controller-26, an effect body vacuum control valve-27, a non-condensation gas flowmeter-28, a one-way control valve-29, a first stage air ejector control valve-10, a second stage air ejector control valve-11, a third stage air ejector control valve-12, a fourth stage air extractor control valve-13, a fifth stage air extractor control valve-14, a first stage cooler flow meter-16, a first stage cooler control valve-15, a second stage cooler flow meter-18, a second stage cooler control valve-17, a third stage cooler flow meter-20, and a third stage cooler control valve-19.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the installation methods and technical terms mentioned in the present invention are technical terms that are already clearly known in the technical field, and thus, the explanation thereof is not repeated. Moreover, the same reference numerals are used for the same components, which do not affect and should not constitute an exact understanding of the technical solutions for a person skilled in the art.
The first embodiment is as follows:
the invention relates to a multi-point vacuum pumping system of a low-temperature multi-effect seawater desalination device, which comprises: a first stage vacuum air ejector 1, a second stage vacuum air ejector 2, a third stage vacuum air ejector 3, a fourth stage vacuum air ejector 4, a fifth stage vacuum air ejector 5, a first stage vacuum cooler 6, a second stage vacuum cooler 7, a third stage vacuum cooler 8, a vacuum silencer 9, a steam input pipeline 21, a cooling water input pipeline 22, a cooling water recovery pipeline 23, a main equipment vacuum access pipeline 24, an auxiliary equipment vacuum access pipeline 25, a vacuum measuring point controller 26 and an effect body vacuum control valve 27, wherein the input end of the first stage vacuum air ejector 1 is connected with the main equipment vacuum access pipeline 24, the subsequent stages of vacuum air ejectors provide stable vacuum pumping effect for main equipment of the seawater desalination device, the output end of the first stage vacuum air ejector 1 is respectively connected with the auxiliary equipment vacuum access pipeline 25 and the input end of the first stage vacuum cooler 6 through T-shaped connecting pipes, the output end of the first-stage vacuum cooler 6 is connected with the input end of the second-stage vacuum cooler 2, the output end of the second-stage vacuum cooler 2 is connected with the input end of the second-stage vacuum cooler 7, the output end of the second-stage vacuum cooler 7 is connected with the input end of the third-stage vacuum ejector 3, the output end of the third-stage vacuum ejector 3 is connected with the input end of the third-stage vacuum cooler 8, the output end of the third-stage vacuum cooler 8 is connected with the input end of the fourth-stage vacuum ejector 4, the output end of the fourth-stage vacuum ejector 4 is connected with the input end of the fifth-stage vacuum ejector 5, the output end of the fifth-stage vacuum ejector 5 is connected with the input end of the vacuum silencer 9, and the vacuum silencer 9 is used for eliminating noise generated by steam jet flow in the working process of the vacuum-pumping system, the first-stage vacuum air extractor 1, the second-stage vacuum air extractor 2, the third-stage vacuum air extractor 3, the fourth-stage vacuum air extractor 4 and the fifth-stage vacuum air extractor 5 are respectively communicated with a steam input pipeline 21 through pipelines, stable power steam is provided for each stage of vacuum air extractor through the steam input pipeline 21, the upper ends of the first-stage vacuum cooler 6, the second-stage vacuum cooler 7 and the third-stage vacuum cooler 8 are respectively communicated with a cooling water recovery pipeline 23 through pipelines, the cooling water circulating recycling and discharging processes are realized through the cooling water recovery pipeline 23, the first-stage vacuum cooler 6, the second-stage vacuum cooler 7 and the third-stage vacuum cooler 8 are used for converting steam into liquid in a vacuum state, the lower ends of the first-stage vacuum cooler 6, the second-stage vacuum cooler 7 and the third-stage vacuum cooler 8 are respectively communicated with a cooling water input pipeline 22 through pipelines, the device comprises a seawater desalination device, a cooling water input pipeline 22, a plurality of vacuum measuring point controllers 26, a plurality of effect body vacuum control valves 27, a plurality of seawater desalination device main equipment and auxiliary equipment, a plurality of seawater desalination device inlet control valves, a plurality of seawater desalination device outlet control valves, a plurality of.
The first-stage vacuum air ejector 1, the second-stage vacuum air ejector 2, the third-stage vacuum air ejector 3, the fourth-stage vacuum air ejector 4 and the fifth-stage vacuum air ejector 5 are ejectors, wherein the ejectors eject steam with certain pressure at supersonic speed through a Laval nozzle, the steam is converted from pressure energy to velocity energy, and negative pressure is formed at the outlet of the nozzle due to the ejecting effect of high-speed airflow to suck out gas in the system.
The outlet end of the third stage vacuum cooler 8 side is provided with a non-condensable gas flowmeter 28 and a one-way control valve 29, the non-condensable gas flowmeter 28 is used for measuring the change condition of the discharge flow of non-condensable gas and feeding back the detection data to the control system in real time, the one-way control valve 29 is used for regulating the one-way flow of the fluid at the outlet end of the third stage vacuum cooler 8 side, so as to avoid the fluctuation of the vacuum degree caused by the suction of external gas into the seawater desalination device when the vacuum pumping system is stopped or in fault, the control system can automatically regulate and control the operation states of the fourth stage vacuum air extractor 4 and the fifth stage vacuum air extractor 5 according to the feedback data of the non-condensable gas flowmeter 28 and the vacuum measuring point controller 26, usually, when the seawater desalination device is maintained in a stable vacuum state, the fourth stage air extractor control valve 13 and the fifth stage air extractor control valve 14 are in a closed state, and the fourth stage vacuum air extractor 4 and the fifth stage vacuum air extractor, when the vacuum leakage rate of the seawater desalination device is large or the vacuum degree fluctuates, the control system can automatically control the fourth-stage vacuum air extractor 4 to be independently put into the operation or simultaneously put into the fourth-stage vacuum air extractor 4 and the fifth-stage vacuum air extractor 5 to operate according to the feedback vacuum fluctuation condition of the vacuum measuring point controller 26, the fourth-stage vacuum air extractor 4 and the fifth-stage vacuum air extractor 5 are directly arranged in series, and the outlet end of the fourth-stage vacuum air extractor 4 is directly and fixedly connected with the extraction end of the fifth-stage vacuum air extractor 5.
A first-stage air extractor control valve 10 is arranged above the first-stage vacuum air extractor 1, the first-stage air extractor control valve 10 is positioned on a pipeline of the first-stage vacuum air extractor 1 communicated with a steam input pipeline 21, a second-stage air extractor control valve 11 is arranged above the second-stage vacuum air extractor 2, the second-stage air extractor control valve 11 is positioned on a pipeline of the second-stage vacuum air extractor 2 communicated with the steam input pipeline 21, a third-stage air extractor control valve 12 is arranged above the third-stage vacuum air extractor 3, the third-stage air extractor control valve 12 is positioned on a pipeline of the third-stage vacuum air extractor 3 communicated with the steam input pipeline 21, the input end of the fourth-stage vacuum air extractor 4 is connected with a fourth-stage air extractor control valve 13, the fourth-stage air extractor control valve 13 is positioned on a pipeline of the fourth-stage vacuum air extractor 4 communicated with the steam input pipeline 21, a fifth-stage air extractor control valve 14 is arranged above the fifth-stage vacuum air extractor 5, the fifth stage ejector control valve 14 is located on a line where the fifth stage vacuum ejector 5 communicates with the steam input line 21.
A first-stage cooler flow meter 16 and a first-stage cooler control valve 15 are sequentially arranged below the first-stage vacuum cooler 6, the first-stage cooler flow meter 16 and the first-stage cooler control valve 15 are positioned on a pipeline communicated with a cooling water input pipeline 22 of the first-stage vacuum cooler 6, a second-stage cooler flow meter 18 and a second-stage cooler control valve 17 are sequentially arranged below the second-stage vacuum cooler 7, the second-stage cooler flow meter 18 and the second-stage cooler control valve 17 are positioned on a pipeline communicated with the cooling water input pipeline 22 of the second-stage vacuum cooler 7, a third-stage cooler flow meter 20 and a third-stage cooler control valve 19 are sequentially arranged below the third-stage vacuum cooler 8, the third-stage cooler flow meter 20 and the third-stage cooler control valve 19 are positioned on a pipeline communicated with the cooling water input pipeline 22 of the third-stage vacuum cooler 8, the first-stage cooler flow meter 16, the second-stage cooler flow meter 18 and the third-stage cooler flow meter 20 automatically feed back and regulate the opening degrees of the first-stage cooler control valve 15, the second-stage cooler control valve 17 and the third-stage cooler control valve 19 according to the steam amount entering the first-stage vacuum ejector 1, the second-stage vacuum ejector 2 and the third-stage vacuum ejector 3, and further regulate the cooling water flow entering the vacuum cooler, and the first-stage ejector control valve 10, the second-stage ejector control valve 11, the third-stage ejector control valve 12, the fourth-stage ejector control valve 13, the fifth-stage ejector control valve 14, the first-stage cooler control valve 15, the first-stage cooler flow meter 16, the second-stage cooler control valve 17, the third-stage cooler flow meter 18, the third-stage cooler control valve 19, the third-stage cooler flow meter 20, the vacuum point controller 26, The effect body vacuum control valve 27 and the non-condensation gas flowmeter 28 can be controllably connected, and the vacuum pumping amount is automatically controlled and adjusted according to the logic control program of the vacuum pumping system, so that the accurate, automatic and stable vacuum pumping effect of the seawater desalination device is realized.
The invention relates to a multipoint vacuum pumping method of a multipoint vacuum pumping system of a low-temperature multi-effect seawater desalination device, which comprises the following specific steps:
s1: in the initial starting stage of the seawater desalination device, in order to quickly establish a vacuum state, according to the vacuum condition of the main equipment and the auxiliary equipment monitored by the vacuum measuring point controller 26, the multistage vacuum pumping device control system is automatically put into operation with the first stage vacuum air extractor 1, the second stage vacuum air extractor 2, the third stage vacuum air extractor 3, the fourth stage vacuum air extractor 4 and the fifth stage vacuum air extractor 5, and the opening degree of the air extractor control valve at the inlet end of each stage of vacuum air extractor is automatically adjusted according to the vacuum pumping quantity, and simultaneously, the first stage cooler flowmeter 16, the second stage cooler flowmeter 18 and the third stage cooler flowmeter 20 automatically control the opening degrees of the first stage cooler control valve 15, the second stage cooler control valve 17 and the third stage cooler control valve 19 by the control system according to the steam quantity entering the first stage vacuum cooler 6, the second stage vacuum cooler 7 and the third stage vacuum cooler 8, so as to maintain the high-efficiency operation state of the vacuum-pumping system of the seawater desalination device.
S2: during the operation of the seawater desalination device, the multistage vacuumizing device control system automatically exits the operation state of the fourth-stage vacuum air ejector 4 and the fifth-stage vacuum air ejector 5 according to the vacuum condition of the main equipment and the auxiliary equipment monitored by the vacuum measuring point controller 26, closes the fourth-stage air ejector control valve 13 and the fifth-stage air ejector control valve 14, and automatically operates the operation state of the first-stage vacuum air ejector 1, the second-stage vacuum air ejector 2 and the third-stage vacuum air ejector 3 partially or completely only by monitoring the vacuum leakage amount through the vacuum measuring point controller 26 while cooperating with the first-stage vacuum cooler 6, the second-stage vacuum cooler 7 and the third-stage vacuum cooler 8, and automatically controls the first-stage cooler control valve 15, the second-stage cooler control valve 18 and the third-stage cooler control valve 20 through the control system according to the steam amount entering the first-stage vacuum cooler 6, the second-stage vacuum cooler 7 and the third-stage vacuum cooler 8, The opening degree of the second-stage cooler control valve 17 and the third-stage cooler control valve 19 maintains the low-efficiency operation state of the vacuum-pumping system of the seawater desalination device.
S3: during the halt period of the seawater desalination device, the multistage vacuumizing device control system closes the third-stage air extractor control valve 12, the second-stage air extractor control valve 11 and the first-stage air extractor control valve 10 step by step, and simultaneously, the first-stage cooler flow meter 16, the second-stage cooler flow meter 18 and the third-stage cooler flow meter 20 automatically control the opening degrees of the first-stage cooler control valve 15, the second-stage cooler control valve 17 and the third-stage cooler control valve 19 by the control system according to the steam amount entering the first-stage vacuum cooler 6, the second-stage vacuum cooler 7 and the third-stage vacuum cooler 8, so that the requirement of cooling standby of the multistage vacuumizing system is met.
Step S2 further includes the steps of:
s2 a: when the vacuum leakage amount of the seawater desalination device is increased due to faults or leakage points, the multistage vacuumizing device control system automatically controls the operation state of the fourth-stage vacuum air extractor 4 or the fifth-stage vacuum air extractor 4 and the fifth-stage vacuum air extractor 5 to be independently input or simultaneously input according to the feedback vacuum fluctuation condition of the main device and the auxiliary device monitored by the vacuum measuring point controller 26 and the discharge flow change of the non-condensed gas monitored by the non-condensed gas flowmeter 28 so as to maintain the high-efficiency operation state of the vacuumizing system of the seawater desalination device.
In step S3, a check valve 29 is provided at the outlet of the third stage vacuum cooler 8 to avoid vacuum fluctuation caused by external air not being sucked into the seawater desalination apparatus during the shutdown of the evacuation system.
The working process is as follows:
in the initial starting stage of the seawater desalination device, in order to quickly establish a vacuum state, according to the vacuum condition of the main equipment and the auxiliary equipment monitored by the vacuum measuring point controller 26, the multistage vacuum pumping device control system is automatically put into operation with the first stage vacuum air extractor 1, the second stage vacuum air extractor 2, the third stage vacuum air extractor 3, the fourth stage vacuum air extractor 4 and the fifth stage vacuum air extractor 5, and the opening degree of the air extractor control valve at the inlet end of each stage of vacuum air extractor is automatically adjusted according to the vacuum pumping quantity, and simultaneously, the first stage cooler flowmeter 16, the second stage cooler flowmeter 18 and the third stage cooler flowmeter 20 automatically control the opening degrees of the first stage cooler control valve 15, the second stage cooler control valve 17 and the third stage cooler control valve 19 by the control system according to the steam quantity entering the first stage vacuum cooler 6, the second stage vacuum cooler 7 and the third stage vacuum cooler 8, so as to maintain the high-efficiency running state of the vacuumizing system of the seawater desalting device; during the operation of the seawater desalination device, the multistage vacuumizing device control system automatically exits the operation state of the fourth-stage vacuum air ejector 4 and the fifth-stage vacuum air ejector 5 according to the vacuum condition of the main equipment and the auxiliary equipment monitored by the vacuum measuring point controller 26, closes the fourth-stage air ejector control valve 13 and the fifth-stage air ejector control valve 14, and automatically operates the operation state of the first-stage vacuum air ejector 1, the second-stage vacuum air ejector 2 and the third-stage vacuum air ejector 3 partially or completely only by monitoring the vacuum leakage amount through the vacuum measuring point controller 26 while cooperating with the first-stage vacuum cooler 6, the second-stage vacuum cooler 7 and the third-stage vacuum cooler 8, and automatically controls the first-stage cooler control valve 15, the second-stage cooler control valve 18 and the third-stage cooler control valve 20 through the control system according to the steam amount entering the first-stage vacuum cooler 6, the second-stage vacuum cooler 7 and the third-stage vacuum cooler 8, The opening degree of the second-stage cooler control valve 17 and the third-stage cooler control valve 19 maintains the low-efficiency operation state of the vacuum-pumping system of the seawater desalination device, a one-way control valve 29 is arranged at the outlet of the third stage vacuum cooler 8 to avoid the fluctuation of vacuum degree caused by that external gas is not sucked into the seawater desalination device during the shutdown period of the vacuum-pumping system, when the vacuum leakage amount of the seawater desalination device is increased due to faults or leakage points, the multistage vacuumizing device control system automatically controls the operation state of independently inputting the fourth-stage vacuum air extractor 4 or simultaneously inputting the fourth-stage vacuum air extractor 4 and the fifth-stage vacuum air extractor 5 according to the feedback vacuum fluctuation condition of the main device and the auxiliary device monitored by the vacuum measuring point controller 26 and the discharge flow change of the non-condensed gas monitored by the non-condensed gas flowmeter 28 so as to maintain the high-efficiency operation state of the vacuumizing system of the seawater desalination device; during the halt period of the seawater desalination device, the multistage vacuumizing device control system closes the third-stage air extractor control valve 12, the second-stage air extractor control valve 11 and the first-stage air extractor control valve 10 step by step, and simultaneously, the first-stage cooler flow meter 16, the second-stage cooler flow meter 18 and the third-stage cooler flow meter 20 automatically control the opening degrees of the first-stage cooler control valve 15, the second-stage cooler control valve 17 and the third-stage cooler control valve 19 by the control system according to the steam amount entering the first-stage vacuum cooler 6, the second-stage vacuum cooler 7 and the third-stage vacuum cooler 8, so that the requirement of cooling standby of the multistage vacuumizing system is met.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any minor modifications, equivalent replacements and improvements made to the above embodiment according to the technical spirit of the present invention should be included in the protection scope of the technical solution of the present invention.
Claims (7)
1. The multi-point vacuum pumping system of the low-temperature multi-effect seawater desalination device is characterized by comprising: the system comprises a first-stage vacuum air ejector (1), a second-stage vacuum air ejector (2), a third-stage vacuum air ejector (3), a fourth-stage vacuum air ejector (4), a fifth-stage vacuum air ejector (5), a first-stage vacuum cooler (6), a second-stage vacuum cooler (7), a third-stage vacuum cooler (8), a vacuum silencer (9), a steam input pipeline (21), a cooling water input pipeline (22), a cooling water recovery pipeline (23), a main equipment vacuum access pipeline (24), an auxiliary equipment vacuum access pipeline (25), a vacuum measuring point controller (26) and an effect body vacuum control valve (27), wherein the input end of the first-stage vacuum air ejector (1) is connected with the main equipment vacuum access pipeline (24), the output end of the first-stage vacuum air ejector (1) is respectively connected with the auxiliary equipment vacuum access pipeline (25) and the input end of the first-stage vacuum cooler (6) through T-shaped connecting pipes, the output end of a first-stage vacuum cooler (6) is connected with the input end of a second-stage vacuum ejector (2), the output end of the second-stage vacuum ejector (2) is connected with the input end of a second-stage vacuum cooler (7), the output end of the second-stage vacuum cooler (7) is connected with the input end of a third-stage vacuum ejector (3), the output end of the third-stage vacuum ejector (3) is connected with the input end of a third-stage vacuum cooler (8), the output end of the third-stage vacuum cooler (8) is connected with the input end of a fourth-stage vacuum ejector (4), the output end of the fourth-stage vacuum ejector (4) is connected with the input end of a fifth-stage vacuum ejector (5), the output end of the fifth-stage vacuum ejector (5) is connected with the input end of a vacuum silencer (9), and the first-stage vacuum ejector (1), the second-stage vacuum ejector (2) and the input end of the third-stage vacuum ejector (, The third-stage vacuum air ejector (3), the fourth-stage vacuum air ejector (4) and the fifth-stage vacuum air ejector (5) are respectively communicated with a steam input pipeline (21) through pipelines, the upper ends of the first-stage vacuum cooler (6), the second-stage vacuum cooler (7) and the third-stage vacuum cooler (8) are respectively communicated with a cooling water recovery pipeline (23) through pipelines, the lower ends of the first-stage vacuum cooler (6), the second-stage vacuum cooler (7) and the third-stage vacuum cooler (8) are respectively communicated with a cooling water input pipeline (22) through pipelines, the plurality of vacuum measuring point controllers (26) are respectively and independently arranged on main equipment and auxiliary equipment of the seawater desalination device, and the plurality of effect body vacuum control valves (27) are respectively arranged on vacuum pipelines of the main equipment and the auxiliary equipment.
2. The multipoint vacuum pumping system of the low-temperature multi-effect seawater desalination plant as claimed in claim 1, characterized in that a non-condensing gas flow meter (28) and a one-way control valve (29) are arranged on a connecting pipeline between the third stage vacuum cooler (8) and the fourth stage vacuum ejector (4).
3. The multipoint vacuum pumping system of the low-temperature multi-effect seawater desalination device according to claim 1, characterized in that a first stage air extractor control valve (10) is arranged above the first stage vacuum air extractor (1), the first stage air extractor control valve (10) is arranged on a pipeline of the first stage vacuum air extractor (1) communicated with the steam input pipeline (21), a second stage air extractor control valve (11) is arranged above the second stage vacuum air extractor (2), the second stage air extractor control valve (11) is arranged on a pipeline of the second stage vacuum air extractor (2) communicated with the steam input pipeline (21), a third stage air extractor control valve (12) is arranged above the third stage vacuum air extractor (3), the third stage air extractor control valve (12) is arranged on a pipeline of the third stage vacuum air extractor (3) communicated with the steam input pipeline (21), and the input end of the fourth stage vacuum air extractor (4) is connected with a fourth stage air extractor control valve (13), the fourth-stage air extractor control valve (13) is located on a pipeline communicated with the fourth-stage vacuum air extractor (4) and the steam input pipeline (21), a fifth-stage air extractor control valve (14) is arranged above the fifth-stage vacuum air extractor (5), and the fifth-stage air extractor control valve (14) is located on a pipeline communicated with the steam input pipeline (21) of the fifth-stage vacuum air extractor (5).
4. The multipoint vacuum pumping system of the low-temperature multi-effect seawater desalination device as claimed in claim 1, wherein a first stage cooler flow meter (16) and a first stage cooler control valve (15) are sequentially arranged below the first stage vacuum cooler (6), the first stage cooler flow meter (16) and the first stage cooler control valve (15) are positioned on a pipeline of the first stage vacuum cooler (6) communicated with the cooling water input pipeline (22), a second stage cooler flow meter (18) and a second stage cooler control valve (17) are sequentially arranged below the second stage vacuum cooler (7), the second stage cooler flow meter (18) and the second stage cooler control valve (17) are positioned on a pipeline of the second stage vacuum cooler (7) communicated with the cooling water input pipeline (22), a third stage cooler flow meter (20) and a third stage cooler control valve (19) are sequentially arranged below the third stage vacuum cooler (8), and a third-stage cooler flow meter (20) and a third-stage cooler control valve (19) are positioned on a pipeline of the third-stage vacuum cooler (8) communicated with the cooling water input pipeline (22).
5. The multipoint vacuum pumping method of the multipoint vacuum pumping system of the low-temperature multi-effect seawater desalination device is characterized by comprising the following specific steps of:
s1: in the initial starting stage of the seawater desalination device, the vacuum conditions of main equipment and auxiliary equipment are monitored according to a vacuum measuring point controller (26), a multi-stage vacuumizing device control system is automatically put into operation of a first-stage vacuum air extractor (1), a second-stage vacuum air extractor (2), a third-stage vacuum air extractor (3), a fourth-stage vacuum air extractor (4) and a fifth-stage vacuum air extractor (5), the opening degree of an air extractor control valve at the inlet end of each stage of vacuum air extractor is automatically adjusted according to the vacuum pumping amount, and meanwhile, a first-stage cooler flow meter (16), a second-stage cooler flow meter (18) and a third-stage cooler flow meter (20) automatically control the opening degrees of a first-stage cooler control valve (15), a second-stage cooler control valve (17) and a third-stage cooler control valve (19) through the control system according to the steam amount entering a first-stage vacuum cooler (6), a second-stage vacuum cooler (7) and a third-stage vacuum cooler (8), so as to maintain the high-efficiency operation state of the vacuum-pumping system of the seawater desalination device.
S2: during the operation of the seawater desalination device, the multistage vacuumizing device control system monitors the vacuum conditions of main equipment and auxiliary equipment according to the vacuum measuring point controller (26), automatically exits the operation state of the fourth-stage vacuum air extractor (4) and the fifth-stage vacuum air extractor (5), closes the fourth-stage air extractor control valve (13) and the fifth-stage air extractor control valve (14), only monitors the vacuum leakage amount through the vacuum measuring point controller (26), and automatically operates the operation states of a part or all of the first-stage vacuum air extractor (1), the second-stage vacuum air extractor (2) and the third-stage vacuum air extractor (3) and simultaneously cooperates with the first-stage vacuum cooler (6), the second-stage vacuum cooler (7) and the third-stage vacuum cooler (8), and the first-stage cooler flowmeter (16), the second-stage cooler flowmeter (18) and the third-stage cooler flowmeter (20) enter the first-stage vacuum cooler (6), The steam amount of the second-stage vacuum cooler (7) and the third-stage vacuum cooler (8) is automatically controlled by the control system to control the opening degrees of the first-stage cooler control valve (15), the second-stage cooler control valve (17) and the third-stage cooler control valve (19) so as to maintain the low-efficiency operation state of the vacuumizing system of the seawater desalination device.
S3: during the halt period of the seawater desalination device, the multistage vacuumizing device control system closes the third-stage air extractor control valve (12), the second-stage air extractor control valve (11) and the first-stage air extractor control valve (10) step by step, and simultaneously, the first-stage cooler flow meter (16), the second-stage cooler flow meter (18) and the third-stage cooler flow meter (20) automatically control the opening degrees of the first-stage cooler control valve (15), the second-stage cooler control valve (17) and the third-stage cooler control valve (19) according to the steam amount entering the first-stage vacuum cooler (6), the second-stage vacuum cooler (7) and the third-stage vacuum cooler (8), so that the requirement of cooling standby of the multistage vacuumizing system is met.
6. The multi-point vacuumizing method of the multi-point vacuumizing system of the low-temperature multi-effect seawater desalination plant of claim 5, wherein the step S2 further comprises the steps of:
s2 a: when the vacuum leakage amount of the seawater desalination device is increased due to faults or leakage points, the multistage vacuumizing device control system automatically controls the operation state of the fourth-stage vacuum air extractor (4) or the fifth-stage vacuum air extractor (4) and the fifth-stage vacuum air extractor (5) to be independently input or simultaneously input according to the feedback vacuum fluctuation condition of the main equipment and the auxiliary equipment monitored by the vacuum measuring point controller (26) and the discharge flow change of the non-condensed gas monitored by the non-condensed gas flowmeter (28) so as to maintain the high-efficiency operation state of the vacuumizing system of the seawater desalination device.
7. The multipoint vacuum pumping method of the multipoint vacuum pumping system of the low-temperature multi-effect seawater desalination plant as claimed in claim 5, wherein the step S3 is implemented by arranging a one-way control valve (29) at the outlet of the third stage vacuum cooler (8) to avoid vacuum degree fluctuation caused by external gas not being sucked into the seawater desalination plant during the shutdown period of the vacuum pumping system.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114873673A (en) * | 2022-05-11 | 2022-08-09 | 首钢京唐钢铁联合有限责任公司 | Liquid drainage device and hot method seawater desalination system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002146430A (en) * | 2000-11-06 | 2002-05-22 | Nippon Steel Corp | Multistage vacuum exhausting apparatus and vacuum exhausting method |
| CN201694861U (en) * | 2010-04-27 | 2011-01-05 | 杭州华达喷射真空设备有限公司 | Low-temperature multi-effect sea water desalination water treatment steam injection vacuum system |
| CN104274991A (en) * | 2013-07-03 | 2015-01-14 | 中国石化工程建设有限公司 | Multi-point vacuum pumping system and multi-point vacuum pumping method |
| CN204755420U (en) * | 2015-06-17 | 2015-11-11 | 浙江杭真能源科技股份有限公司 | Six grades of steam jet pump vacuum pumping system |
| CN107723417A (en) * | 2017-08-21 | 2018-02-23 | 中冶南方工程技术有限公司 | Pumped vacuum systems and its application method, vacuum refining system |
| CN215479839U (en) * | 2021-04-21 | 2022-01-11 | 天津国投津能发电有限公司 | Multi-point vacuum pumping system of low-temperature multi-effect seawater desalination device |
-
2021
- 2021-04-21 CN CN202110429923.9A patent/CN113087055B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002146430A (en) * | 2000-11-06 | 2002-05-22 | Nippon Steel Corp | Multistage vacuum exhausting apparatus and vacuum exhausting method |
| CN201694861U (en) * | 2010-04-27 | 2011-01-05 | 杭州华达喷射真空设备有限公司 | Low-temperature multi-effect sea water desalination water treatment steam injection vacuum system |
| CN104274991A (en) * | 2013-07-03 | 2015-01-14 | 中国石化工程建设有限公司 | Multi-point vacuum pumping system and multi-point vacuum pumping method |
| CN204755420U (en) * | 2015-06-17 | 2015-11-11 | 浙江杭真能源科技股份有限公司 | Six grades of steam jet pump vacuum pumping system |
| CN107723417A (en) * | 2017-08-21 | 2018-02-23 | 中冶南方工程技术有限公司 | Pumped vacuum systems and its application method, vacuum refining system |
| CN215479839U (en) * | 2021-04-21 | 2022-01-11 | 天津国投津能发电有限公司 | Multi-point vacuum pumping system of low-temperature multi-effect seawater desalination device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114873673A (en) * | 2022-05-11 | 2022-08-09 | 首钢京唐钢铁联合有限责任公司 | Liquid drainage device and hot method seawater desalination system |
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