CN103922533A - Dynamic simulation testing device and dynamic simulation testing method for low-temperature multieffect seawater desalination scale inhibitor - Google Patents
Dynamic simulation testing device and dynamic simulation testing method for low-temperature multieffect seawater desalination scale inhibitor Download PDFInfo
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Abstract
The invention discloses a dynamic simulation testing device and a dynamic simulation testing method for a low-temperature multieffect seawater desalination scale inhibitor. The device comprises a seawater circulation and evaporation part, a condensation part, a heat source part and a vacuumizing part; the seawater circulation and evaporation part is connected with the condensation part and the heat source part respectively, and the condensation part is connected with the vacuumizing part; the seawater circulation and evaporation part comprises a raw water storage tank for storing experimental raw water, and the raw water storage tank is connected with an evaporator which is connected with a seawater circulating pump for enabling seawater to circularly flow in the evaporator. The dynamic simulation testing device and the method have the beneficial effects of being capable of entirely simulating the true environment and state of a low-temperature multieffect seawater desalination industrial device, thus further enabling the test results to have representativeness and guidance values. The device is of a function modularization design, is clear in flow process, flexible to distribute, and small in volume so as to be put in a laboratory; the evaporator and a condenser are made of transparent organic glass materials, so that the test process is easy to observe.
Description
Technical field
The invention belongs to low-temperature multiple-effect seawater desalination field, relate in particular to dynamic simulation tester and the method for a kind of small-sized low-temperature multiple-effect seawater desalination (MED) Scale inhibitors.
Background technology
Low-temperature multiple-effect seawater desalination is the light technique in main flow current and that reverse osmosis technology is parallel sea, develops also very fast.In the light operational process in sea, evaporation of seawater is concentrated, has the tendency at heat transfer tube surface scale, so raw material seawater will add Scale inhibitors, suppresses the fouling in operational process.The control quality of performance of antisludging agent and add-on directly affects the scaling rate of heat exchange surface in vaporizer.
The Scale inhibitors of current domestic use is all generally external import, and cost is relatively high.If use new Scale inhibitors scheme, the way of securing point is in the enterprising Mobile state simulation test of packaged unit, fully verifies suitability, stability, the scale inhibition ability of this Scale inhibitors under these processing condition, and determines optimal addition dosage by simulation test.Actual scaling rate can be subject to the impact of the series of factors such as water quality, temperature, heat transfer tube surface property, spray flow, performance of antisludging agent, concentration, make simulation test conclusion really credible, dynamic analog device must the true virtual condition that reflects the extra large light system of industry.
In low-temperature multi-effect seawater desalination device actual motion, the concentrated seawater of the first effect body, due to state of saturation under negative pressure, in the further evaporation concentration of heat transfer tube surface meeting, and this process can directly affect the scaling tendency on heat transfer tube surface.Existing Scale inhibitors dynamic simulation experimental device can not be simulated this time of day, causes simulation test conclusion accurate not, affects experiment effect.
Summary of the invention
Object of the present invention is exactly in order to address the above problem, a kind of dynamic simulation tester and method of small-sized low-temperature multiple-effect seawater desalination Scale inhibitors have been proposed, this apparatus structure is simple, easy to operate, can carry out accurately determining of the operating parameters such as the screening of low temperature multi-effect seawater desalting system Scale inhibitors and chemical feeding quantity, concentration rate, minimum spray flow.
To achieve these goals, the present invention adopts following technical scheme:
A dynamic simulation tester for low-temperature multiple-effect seawater desalination Scale inhibitors, comprising: seawater circulating and evaporating part, condensation portion, thermal source part and vacuumized part; Seawater circulating and evaporating part is connected respectively with condensation portion, thermal source part, and condensation portion is connected with vacuumized part.
Described seawater circulating and evaporating part comprises: for store experiment seawater former water water storage tank be connected with vaporizer, vaporizer with for seawater is connected at the mobile sea water circulating pump of vaporizer internal recycle.
Described condensation portion comprises: condenser, and be connected respectively with condenser for exporting the fresh water transfer pump of fresh water, for inputting the condenser water valve of water coolant, condenser vacuum pumping valve for being connected with vacuumized part.
Described thermal source part comprises: hot well tank, and be connected with hot well tank for making hot water at hot well tank and the mobile hot water circulating pump of vaporizer internal recycle.
Described vacuumized part comprises: the vacuum pumping pump cyclic water tank, vacuum pumping pump and the injector that connect successively, described injector is connected with condenser vacuum pumping valve.
Described seawater circulating and evaporating part also comprises:
On described vaporizer, be respectively equipped with heat transfer tube, for allowing evenly water distributor and the vaporizer vacuum meter of spray on heat transfer tube of seawater; Water distributor be arranged on heat transfer tube directly over, evenly punch in filling pipe bottom; Described water distributor is connected with the outlet of sea water circulating pump.
Described seawater circulating and evaporating part also comprises:
The entrance and exit place of sea water circulating pump is respectively equipped with sea water circulating pump inlet valve and sea water circulating pump outlet valve; The outlet of described sea water circulating pump also enters blowdown channel successively after concentrated seawater wash water valve, concentrated seawater blowdown flow meter.
Described seawater circulating and evaporating part also comprises:
Described former water water storage tank exit is provided with former water water storage tank liquid-outlet valve, and former water water storage tank liquid-outlet valve connects successively seawater refill flow meter through a road pipeline and is connected with vaporizer after seawater water compensating valve, after another road pipeline is connected with seawater blow-off valve, enters emptying channel.
Described condensation portion also comprises:
In described condenser, be provided with prolong, be respectively equipped with fresh water transfer pump inlet valve and fresh water transfer pump outlet valve at the entrance and exit place of described fresh water transfer pump.
Described thermal source part also comprises:
Be provided with electric heater with thermostat in described hot well tank bottom, described hot water circulating pump exit is provided with hot water circulating pump outlet valve, and hot water circulating pump outlet valve is connected with heat transfer tube one end, the heat transfer tube the other end is connected to hot well tank through hot water backwater's valve.
A method for the dynamic simulation tester of low-temperature multiple-effect seawater desalination Scale inhibitors, comprises the following steps:
(1) respectively test seawater and Scale inhibitors are joined to former water water storage tank by predetermined concentration; Set up the seawater circulation of vaporizer-sea water circulating pump-vaporizer.
(2) to vacuumizing in condenser and vaporizer.
(3) set up the hot water circulation of hot well tank-hot water circulating pump-heat exchange pipe of evaporator-hot well tank.
(4) the seawater temperature that reaches capacity of circulation, and fresh water water level in condenser rise under prolong along time, start fresh water transfer pump fresh water discharged.
(5), in the time that the liquid level in vaporizer is reduced to the test concentration rate of setting, carry out vaporizer moisturizing and concentrated seawater blowdown.
(6) after off-test, stoppage in transit experimental installation.
The detailed process of described step (1) is as follows:
Test seawater first joins former water water storage tank, and Scale inhibitors also adds former water water storage tank by predetermined concentration, opens former water water storage tank liquid-outlet valve and seawater water compensating valve, and former seawater is injected to vaporizer, and vaporizer liquid level is controlled at edge under heat transfer tube.
Close seawater water compensating valve, start sea water circulating pump, open sea water circulating pump outlet valve, close concentrated seawater wash water valve, the seawater circulation of vaporizer-sea water circulating pump-vaporizer, records level readings in initial evaporation device.
The detailed process of described step (3) is as follows:
To hot well tank moisturizing to approaching full-water level, start hot water circulating pump by flexible pipe, open hot water circulating pump outlet valve and hot water backwater's valve, set up the hot water circulation of hot well tank-hot water circulating pump-heat exchange pipe of evaporator-hot well tank.
Circulation is normal set up after, drop into Temperature controlled heater, the top temperature of Temperature controlled heater be set as subjects the first single-effect evaporator actual motion top temperature ± 1 DEG C.
Open cold condenser water intaking valve, drops into water coolant.
The detailed process of described step (6) is as follows:
1) stoppage in transit Temperature controlled heater, water temperature approaches after room temperature, stoppage in transit hot water circulating pump.
2) close vacuum pumping valve, stoppage in transit vacuum pumping pump.
3) close condensation water valve, stoppage in transit fresh water transfer pump.
4) close former water water storage tank liquid-outlet valve, close concentrated seawater wash water valve.
5) stop sea water circulating pump.
6) open seawater blow-off valve, water in emptying vaporizer.
The invention has the beneficial effects as follows:
Can simulate true environment and the state of low-temperature multiple-effect seawater desalination full scale plant completely, thereby make test-results have more representativeness and guiding value.Function modoularization design of the present invention, clear process, flexible arrangement, volume is little, can be positioned in laboratory, and vaporizer and condenser adopt transparent organic glass material, and process of the test is easy to observe.Heat transfer tube in vaporizer adopts the heat transfer tube of actual industrial device as test section, and installation and removal are convenient.
The equal capable of regulatings of parameter such as temperature, pressure, specific liquid rate, concentration rate, inhibitor concentration, can be used for screening, the exploitation of low temperature multi-effect seawater desalting system Scale inhibitors, the operating parameters such as Scale inhibitors Applicable temperature, chemical feeding quantity, concentration rate, minimum spray flow determine.
Brief description of the drawings
Fig. 1 is the dynamic simulation tester structural representation of low-temperature multiple-effect seawater desalination Scale inhibitors of the present invention;
Fig. 2 is heat transfer tube scheme of installation of the present invention;
Wherein, 1. vaporizer, 2. condenser, 3. heat transfer tube, 4. water distributor, 5. sea water circulating pump, 6. sea water circulating pump inlet valve, 7. sea water circulating pump outlet valve, 8. vaporizer vacuum meter, 9. prolong, 10. condensation water valve, 11. concentrated seawater wash water valves, 12. concentrated seawater blowdown flow meters, 13. former water water storage tanks, 14. former water water storage tank liquid-outlet valves, 15. seawater water compensating valves, 16. seawater refill flow meters, 17. seawater blow-off valves, 18. hot well tanks, 19. hot water circulating pumps, 20. hot water circulating pump outlet valves, 21. hot water backwater's valves, 22. electric heater with thermostat, 23. vacuum pumping pump cyclic water tanks, 24. vacuum pumping pumps, 25. vacuum pumping pump outlet valves, 26. injectors, 27. condenser vacuum pumping valves, 28. fresh water transfer pump inlet valves, 29. fresh water transfer pumps, 30. fresh water transfer pump outlet valves.
Embodiment:
Below in conjunction with accompanying drawing and embodiment, the present invention will be further described:
For the sea water desaltination of low-temperature multi-effect, be easy to the region of fouling most at the first single-effect evaporator, because the seawater salt concentration of the first effect is the highest, temperature is the highest, as long as accomplish that under the operational conditions of the first effect, obvious fouling not occurring has just reached object.So this simulator operating parameter is also according to the mal-condition design of the first effect.
As shown in Figure 1, whole experimental installation comprises seawater circulating evaporator part, condenser portion, thermal source part and vacuumized part.
Seawater circulating and evaporating part comprises: for store experiment seawater former water water storage tank 13 be connected with vaporizer 1, vaporizer 1 with for seawater is connected at the mobile sea water circulating pump 5 of vaporizer internal recycle; On vaporizer 1, be respectively equipped with heat transfer tube 3, water distributor 4, the effect of water distributor 4 is to allow seawater evenly spray on heat transfer tube, evenly punching on center line under water distributor 4, and the total sectional area in hole is 1/2 of water distributor sectional area.With vaporizer vacuum meter 8; The outlet of sea water circulating pump 5 is connected with water distributor 4.
The entrance and exit place of sea water circulating pump 5 is respectively equipped with sea water circulating pump inlet valve 6 and sea water circulating pump outlet valve 7; The outlet of sea water circulating pump 5 also enters blowdown channel successively after concentrated seawater wash water valve 11, concentrated seawater blowdown flow meter 12.
Former water water storage tank 13 exits are provided with former water water storage tank liquid-outlet valve 14, and former water water storage tank liquid-outlet valve 14 connects successively seawater refill flow meter 16 through a road pipeline and is connected with vaporizer 1 after seawater water compensating valve 15, after another road pipeline is connected with seawater blow-off valve 17, enters emptying channel.
Condensation portion comprises: condenser 2, and be connected respectively with condenser 2 for exporting the fresh water transfer pump 29 of fresh water, for inputting the condenser water valve 10 of water coolant, condenser vacuum pumping valve 27 for being connected with vacuumized part; In condenser 2, be provided with prolong 9, be respectively equipped with fresh water transfer pump inlet valve 28 and fresh water transfer pump outlet valve 30 at the entrance and exit place of fresh water transfer pump 29.
Thermal source part comprises: hot well tank 18, and be connected with hot well tank 18 for making hot water at hot well tank and the mobile hot water circulating pump 19 of vaporizer internal recycle; Be provided with electric heater with thermostat 22 in hot well tank 18 inside, hot water circulating pump 19 exits are provided with hot water circulating pump outlet valve 20, and hot water circulating pump outlet valve 20 is connected with heat transfer tube 3 one end, heat transfer tube 3 the other ends are connected to hot well tank 18 through hot water backwater's valve 21.
Vacuumized part comprises: the vacuum pumping pump cyclic water tank 23, vacuum pumping pump 24 and the injector 26 that connect successively, and injector 26 is realized and is vacuumized function with vacuum pumping pump combination, and described injector 26 is connected with condenser vacuum pumping valve 27.
For ease of the observation at any time to internal state in simulated experiment, vaporizer 1 and condenser 2 adopt transparent synthetic glass material, and material heatproof should be indeformable at 80 DEG C, and can bear perfect vacuum compressive strength, and system stopping property is intact.
The material of all parts that seawater circulating evaporator part comprises is answered seawater corrosion resistance, and rest part selection is by the requirement of contact fresh water.
Heat transfer tube 3 in vaporizer 1, adopts the heat transfer tube of actual industrial device as test section, before installing, carries out mantle fiber at the two ends of test section with die head threading machine, is convenient to install and dismounting, and its layout and installation are as shown in Figure 2.
The specific experiment process of testing apparatus of the present invention is as follows:
The first step, set up seawater circulation:
1) test seawater first joins former water water storage tank 13, and Scale inhibitors also adds former water water storage tank 13 by predetermined concentration.
2) open former water water storage tank liquid-outlet valve 14 and seawater water compensating valve 15, former seawater is injected to vaporizer 1, liquid level is controlled at 3 times edges of heat transfer tube, closes seawater water compensating valve 15.
3) start sea water circulating pump 5, open sea water circulating pump outlet valve 7, close concentrated seawater wash water valve 11, set up the seawater circulation of vaporizer 1-sea water circulating pump 5-vaporizer 1, record the level readings in vaporizer 1 under original state, indicate with volume L.
Second step, set up vacuum:
1) inject tap water to overflow port position by flexible pipe to vacuum pumping pump cyclic water tank 23.
2) start and vacuumize recycle pump 24, open pump discharge valve 25 and vacuum pumping valve 27, condenser 2 and vaporizer 1 are vacuumized, to below 60mm mercury column.
The 3rd step, system heats up:
1) by flexible pipe to hot well tank 18 moisturizings to approaching full-water level.
2) start hot water circulating pump 29, open hot water circulating pump outlet valve 20 and hot water backwater's valve 21, foundation circulation is as follows: hot well tank 18-hot water circulating pump 19-heat exchange pipe of evaporator 3-hot well tank 18.
3) after the normal foundation normally of circulation, drop into Temperature controlled heater 22, design temperature is in test temperature ± 1 DEG C.
Dynamic analog test is taking certain concrete extra large light device as simulated object, and test temperature just refers to the top temperature of this subjects the first single-effect evaporator actual motion.
4) open cold condenser water intaking valve 10, drops into water coolant (connecing from tap water).
The 4th step, steady running:
1) along with the rising of system temperature, the seawater temperature that reaches capacity of circulation, the seawater of spray produces steam in heat transfer tube 3 surface evaporations, steam enters condenser 2 through vapour passage, be cooled to fresh water, the interior fresh water water level of condenser 2 rise under prolong along time, start fresh water transfer pump 29 fresh water discharged, regulate fresh water transfer pump outlet valve 30 to make the interior level stability of condenser 2.
2) when the liquid level in vaporizer 1 is reduced to the test concentration rate (the interior liquid level of vaporizer 1/current liquid level under concentration rate=original state) of drafting, slowly open seawater water compensating valve 15, and concentrated seawater wash water valve 11.Adjust seawater water compensating valve 15 and concentrated seawater wash water valve 11 apertures, make: the interior level stability of vaporizer 1, refill flow equals to test concentration rate with the ratio of blowdown flow.
So just ensured in quite long test period, seawater ionic concn and the inhibitor concentration of circulation are basicly stable.
The 5th step, off-test stoppage in transit step:
When test proceeds to the predetermined time limit, or heat transfer tube 3 foulings be very seriously need to finish to test time, operation as follows:
1) stoppage in transit Temperature controlled heater 22, water temperature approaches after room temperature, stops hot water circulating pump 19.
2) close vacuum pumping valve 27, stop pumping vacuum pump 24.
3) close condenser cooling water water intaking valve 10, stop fresh water transfer pump 29.
4) close former water water storage tank liquid-outlet valve 14, close concentrated seawater wash water valve 11.
5) stop sea water circulating pump 5.
6) open seawater blow-off valve 17, the interior water of emptying vaporizer 1.
7) take out test heat transfer tube 2 and carry out the observation of surface scale situation and carry out dirty component analysis, thereby evaluate the scale-inhibiting properties of this Scale inhibitors scheme.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendments that creative work can make or distortion still in protection scope of the present invention.
Claims (10)
1. a dynamic simulation tester for low-temperature multiple-effect seawater desalination Scale inhibitors, is characterized in that, comprising: seawater circulating and evaporating part, condensation portion, thermal source part and vacuumized part; Seawater circulating and evaporating part is connected respectively with condensation portion, thermal source part, and condensation portion is connected with vacuumized part;
Described seawater circulating and evaporating part comprises: for store experiment seawater former water water storage tank be connected with vaporizer, vaporizer with for seawater is connected at the mobile sea water circulating pump of vaporizer internal recycle;
Described condensation portion comprises: condenser, and be connected respectively with condenser for exporting the fresh water transfer pump of fresh water, for inputting the condenser water valve of water coolant, condenser vacuum pumping valve for being connected with vacuumized part;
Described thermal source part comprises: hot well tank, and be connected with hot well tank for making hot water at hot well tank and the mobile hot water circulating pump of vaporizer internal recycle;
Described vacuumized part comprises: the vacuum pumping pump cyclic water tank, vacuum pumping pump and the injector that connect successively, described injector is connected with condenser vacuum pumping valve.
2. the dynamic simulation tester of a kind of low-temperature multiple-effect seawater desalination Scale inhibitors as claimed in claim 1, is characterized in that, described seawater circulating and evaporating part also comprises:
On described vaporizer, be respectively equipped with heat transfer tube, for allowing evenly water distributor and the vaporizer vacuum meter of spray on heat transfer tube of seawater; Water distributor be arranged on heat transfer tube directly over, evenly punch in filling pipe bottom; Described water distributor is connected with the outlet of sea water circulating pump.
3. the dynamic simulation tester of a kind of low-temperature multiple-effect seawater desalination Scale inhibitors as claimed in claim 1, is characterized in that, described seawater circulating and evaporating part also comprises:
The entrance and exit place of sea water circulating pump is respectively equipped with sea water circulating pump inlet valve and sea water circulating pump outlet valve; The outlet of described sea water circulating pump also enters blowdown channel successively after concentrated seawater wash water valve, concentrated seawater blowdown flow meter.
4. the dynamic simulation tester of a kind of low-temperature multiple-effect seawater desalination Scale inhibitors as claimed in claim 1, is characterized in that, described seawater circulating and evaporating part also comprises:
Described former water water storage tank exit is provided with former water water storage tank liquid-outlet valve, and former water water storage tank liquid-outlet valve connects successively seawater refill flow meter through a road pipeline and is connected with vaporizer after seawater water compensating valve, after another road pipeline is connected with seawater blow-off valve, enters emptying channel.
5. the dynamic simulation tester of a kind of low-temperature multiple-effect seawater desalination Scale inhibitors as claimed in claim 1, is characterized in that, described condensation portion also comprises:
In described condenser, be provided with prolong, be respectively equipped with fresh water transfer pump inlet valve and fresh water transfer pump outlet valve at the entrance and exit place of described fresh water transfer pump.
6. the dynamic simulation tester of a kind of low-temperature multiple-effect seawater desalination Scale inhibitors as claimed in claim 1, is characterized in that, described thermal source part also comprises:
Be provided with electric heater with thermostat in described hot well tank bottom, described hot water circulating pump exit is provided with hot water circulating pump outlet valve, and hot water circulating pump outlet valve is connected with heat transfer tube one end, the heat transfer tube the other end is connected to hot well tank through hot water backwater's valve.
7. a method for the dynamic simulation tester of low-temperature multiple-effect seawater desalination Scale inhibitors as claimed in claim 1, is characterized in that, comprises the following steps:
(1) respectively test seawater and Scale inhibitors are joined to former water water storage tank by predetermined concentration; Set up the seawater circulation of vaporizer-sea water circulating pump-vaporizer;
(2) to vacuumizing in condenser and vaporizer;
(3) set up the hot water circulation of hot well tank-hot water circulating pump-heat exchange pipe of evaporator-hot well tank;
(4) the seawater temperature that reaches capacity of circulation, and fresh water water level in condenser rise under prolong along time, start fresh water transfer pump fresh water discharged;
(5), in the time that the liquid level in vaporizer is reduced to the test concentration rate of setting, carry out vaporizer moisturizing and concentrated seawater blowdown;
(6) after off-test, stoppage in transit experimental installation.
8. the method for the dynamic simulation tester of a kind of low-temperature multiple-effect seawater desalination Scale inhibitors as claimed in claim 7, is characterized in that, the detailed process of described step (1) is as follows:
Test seawater first joins former water water storage tank, and Scale inhibitors also adds former water water storage tank by predetermined concentration, opens former water water storage tank liquid-outlet valve and seawater water compensating valve, and former seawater is injected to vaporizer, and vaporizer liquid level is controlled at edge under heat transfer tube;
Close seawater water compensating valve, start sea water circulating pump, open sea water circulating pump outlet valve, close concentrated seawater wash water valve, the seawater circulation of vaporizer-sea water circulating pump-vaporizer, records level readings in initial evaporation device.
9. the method for the dynamic simulation tester of a kind of low-temperature multiple-effect seawater desalination Scale inhibitors as claimed in claim 7, is characterized in that, the detailed process of described step (3) is as follows:
To hot well tank moisturizing to approaching full-water level, start hot water circulating pump by flexible pipe, open hot water circulating pump outlet valve and hot water backwater's valve, set up the hot water circulation of hot well tank-hot water circulating pump-heat exchange pipe of evaporator-hot well tank;
Circulation is normal set up after, drop into Temperature controlled heater, the top temperature of Temperature controlled heater be set as subjects the first single-effect evaporator actual motion top temperature ± 1 DEG C;
Open cold condenser water intaking valve, drops into water coolant.
10. the method for the dynamic simulation tester of a kind of low-temperature multiple-effect seawater desalination Scale inhibitors as claimed in claim 7, is characterized in that, the detailed process of described step (6) is as follows:
1) stoppage in transit Temperature controlled heater, water temperature approaches after room temperature, stoppage in transit hot water circulating pump;
2) close vacuum pumping valve, stoppage in transit vacuum pumping pump;
3) close condensation water valve, stoppage in transit fresh water transfer pump;
4) close former water water storage tank liquid-outlet valve, close concentrated seawater wash water valve;
5) stop sea water circulating pump;
6) open seawater blow-off valve, water in emptying vaporizer.
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| CN109028645A (en) * | 2018-08-16 | 2018-12-18 | 佛山市和利环保科技有限公司 | Industrial circulating cooling water device |
| CN109375529A (en) * | 2018-12-13 | 2019-02-22 | 交通运输部天津水运工程科学研究所 | A kind of water route harmful influence transport leakage pollution Failure Simulation device |
| CN115403132A (en) * | 2022-10-11 | 2022-11-29 | 华能青岛热电有限公司 | Dissolved oxygen rapid lifting system and process for seawater source circulating water |
| CN115403211A (en) * | 2022-10-11 | 2022-11-29 | 华能青岛热电有限公司 | Seawater bacteriostasis system and process of electromagnetic composite polarization bactericide |
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| CN103922533B (en) | 2015-04-22 |
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