CN102889577A - External dry steam flash evaporation two-effect heat exchange system - Google Patents
External dry steam flash evaporation two-effect heat exchange system Download PDFInfo
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- CN102889577A CN102889577A CN201210394001XA CN201210394001A CN102889577A CN 102889577 A CN102889577 A CN 102889577A CN 201210394001X A CN201210394001X A CN 201210394001XA CN 201210394001 A CN201210394001 A CN 201210394001A CN 102889577 A CN102889577 A CN 102889577A
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Abstract
The invention relates to an external dry steam flash evaporation two-effect heat exchange system; a flow divider is arranged in the liquid phase space of a water-bath saturated steam generator; the exhaust steam pipeline of the water-bath saturated steam generator is sequentially provided with a steam-water separator and a steam drying heat exchanger; the superheated steam enters the flow divider through a pressure control valve; the wet saturated steam generated by the saturated steam generator is heated by the superheated steam to obtain the dry saturated steam; the dry saturated steam enters a main steam heat exchanger to heat the materials again and then obtain the high-temperature condensed water; the flash steam is generated after flash evaporation of the high-temperature condensed water to heat the materials in a flash steam heat exchanger; the flash steam condensed water enters a water-collecting tank and is pumped into the saturated steam generator through a make-up water pump; a PLC (programmable logic controller) controller adjusts the opening degrees of the pressure control valve according to the temperature of a material outlet. The system achieves the gradient utilization of the steam heat to ensure the steam heat to be fully utilized, thereby improving the energy efficiency.
Description
Technical field
The present invention relates to a kind of steam heat-exchanging system, particularly a kind of outer dry steam flash distillation two effect heat-exchange systems.
Background technology
During indirect heat exchange, the saturated vapor heat exchange efficiency is higher than superheated steam, and the degree of superheat is higher, and heat exchange efficiency is lower.When only having the superheated steam source, then need superheated steam is carried out desuperheat, reduce the degree of superheat.General steam temp lowering device such as atomizing attemperator, the non-contact attemperator etc. of adopting, the degree of superheat is lower behind the desuperheat, and water entrained by steam is more serious, and steam quality is poorer.If vapor (steam) temperature need to be down to required saturation temperature corresponding to steam pressure of using, then usually to use the water-bath type saturated steam generator, be called again the water-bath type steam temp lowering device.
The cylindrical shell bottom of water-bath type saturated steam generator is liquid Space, cylindrical shell top is vapor phase space, the roof of vapor phase space is provided with water-bath type saturated steam generator exhaust steam valve, be provided with current divider in the liquid Space, overheated steam pipe stretches in the water-bath type saturated steam generator and is connected with current divider, the sidewall of water-bath type saturated steam generator is equipped with water level and takes into account overflow valve, pressure probe is installed on the roof, the moisturizing delivery side of pump links to each other with the bottom of water-bath type saturated steam generator, and replenishes an amount of condensed water according to the water level control signal of water-level gauge in the water-bath type saturated steam generator.Pressure gauge and pressure-control valve are installed on the overheated steam pipe, and the saturated vapor pressure force signal that pressure probe records offers the PLC controller, the aperture of PLC controller controlled pressure control valve.Superheated steam flows out from current divider, becomes wet saturated steam through the water heat exchange cooling with liquid Space and upwards overflows, from the water-bath type saturated steam generator exhaust steam valve outflow of roof.The weak point of existing water-bath type saturated steam generator is: the moisture content in the saturated vapor is higher, and steam quality is poor.
After the vapor heat exchanger heat exchange, steam discharges latent heat, and is condensed into the high-temperature condensation water under the uniform pressure, and high-temperature condensation water enters condensate pipe through drain valve.After high-temperature condensation water enters condensate pipe, along the continuous pressure drop of journey, part high-temperature condensation water flash-off of steam, more than 1000 times of volumetric expansions, flow velocity increases about 10 times, very easily forms vapour locking; The back pressure of drain valve increases after the vapour locking, and drain valve two ends pressure reduction reduces, and hydrophobic discharge capacity descends, and the condensed water that causes producing in the heat exchanger can not in time be got rid of, and heat exchanger efficiency descends, and temperature of charge can not reach technological requirement, produces thereby impact is normal.Produce for guaranteeing, often need to open the stop valve in parallel with drain valve and carry out in linely, the steam pressure that stop valve leaks has been offset the vapour locking resistance; Though guaranteed production, steam utilization reduces, and the unit product steam consumption increases.Therefore existing heat-exchange system heat exchange efficiency and efficiency are lower.
Summary of the invention
The object of the invention is to, overcome problems of the prior art, a kind of outer dry steam flash distillation two effect heat-exchange systems are provided, can reduce the moisture content in the saturated vapor, take full advantage of the latent heat of steam and the sensible heat of condensed water.
For solving above technical problem, a kind of outer dry steam flash distillation two effect heat-exchange systems of the present invention, comprise water-bath type saturated steam generator and small pump, the cylindrical shell bottom of described water-bath type saturated steam generator is liquid Space, cylindrical shell top is vapor phase space, the roof of described vapor phase space is provided with exhaust steam valve, be provided with current divider in the described liquid Space, described moisturizing delivery side of pump links to each other with the bottom of described water-bath type saturated steam generator, steam-water separator and steam drying heat exchanger are installed on the export pipeline of described water-bath type saturated steam generator exhaust steam valve successively, and the bottom of described steam-water separator is equipped with drain valve; The superheated steam import of described steam drying heat exchanger is connected with the steam source pipe road of superheated steam, the superheated steam outlet of described steam drying heat exchanger is equipped with the pressure-control valve that is controlled by the PLC controller, the outlet of described pressure-control valve is connected with the current divider of described water-bath type saturated steam generator, the saturated vapor import of described steam drying heat exchanger is connected with the outlet of described steam-water separator, the saturated vapor outlet of described steam drying heat exchanger is connected with the steam inlet of main steam heat exchanger, the outlet that the condensation-water drain of main steam heat exchanger is provided with drain valve and drain valve is connected with the condensed water import of flash tank, the condensation-water drain of flash tank is connected with the import of water collect tank, and the outlet of water collect tank is connected with the entrance of described small pump; The outlet that the top of described flash tank is equipped with level pressure overflow valve and level pressure overflow valve is connected with the steam inlet of flash steam heat exchanger, and the outlet that the condensation-water drain of flash steam heat exchanger is connected with drain valve and drain valve also is connected with the import of water collect tank; The material inlet pipe is connected with the material inlet of described flash steam heat exchanger, and the material outlet of flash steam heat exchanger is connected with the material inlet of described main steam heat exchanger, and the material outlet of main steam heat exchanger connects material outlet pipe; The first temperature sensor is installed on the described material outlet pipe, the outlet of described main steam heat exchanger drain valve is equipped with the second temperature sensor, the holding wire of described the first temperature sensor and the second temperature sensor accesses respectively the signal input part of described PLC controller, and the control signal wire of described PLC controller accesses described pressure-control valve.
With respect to prior art, the present invention has obtained following beneficial effect: superheated steam carries out indirect to saturated vapor first in the steam drying heat exchanger, enter again the current divider of water-bath type saturated steam generator by pressure-control valve, becoming wet saturated steam from current divider steam out after lowering the temperature with the water heat exchange of liquid Space upwards overflows, this moment, the moisture content of saturated vapor was higher, after the exhaust steam valve outflow of roof, separate through steam-water separator, Steam moisture reduces, enter again the steam drying heat exchanger, superheated steam carries out indirect to saturated vapor in the steam drying heat exchanger, make the aqueous water in the wet saturated steam be evaporated to steam, become dry saturated steam.Dry saturated steam enters the main steam heat exchanger material is carried out the indirect second time, becomes high-temperature condensation water behind the release latent heat, is discharged by drain valve from the high-temperature condensation water that the main steam heat exchanger flows out.High-temperature condensation water sends into that the diffusion flash distillation is the lower flash-off steam of pressure in the flash tank, and the pressure of flash-off steam is set by the level pressure overflow valve of flash drum overhead; Flash-off steam enters and discharges latent heat in the flash steam heat exchanger and material is carried out the indirect first time, and the flash-off steam behind the release latent heat is condensed into cryogenic condensation water.The cryogenic condensation water of being discharged by cryogenic condensation water and the flash tank of the discharge of flash steam heat exchanger drain valve enters water collect tank, is pumped in the water-bath type saturated steam generator by small pump again.The first temperature sensor is surveyed the temperature of material in the material outlet pipe and is offered the PLC controller, and the PLC controller is according to the aperture of material outlet adjustment pressure-control valve, thus the pressure of steam supply of control water-bath type saturated steam generator.The second temperature sensor is by surveying the duty that the condensed water water temperature can perception main steam heat exchanger drain valve, the PLC controller compares the temperature of the second temperature sensor detection and maximum temperature and the minimum temperature of setting: if condensate temperature is between maximum temperature and minimum temperature that the PLC controller is set behind the drain valve, then drain valve is working properly; If condensate temperature is higher than the maximum temperature that the PLC controller is set behind the drain valve, trap leaking then, system alarm is so that alert is in time safeguarded; If condensate temperature is lower than the minimum temperature that the PLC controller is set behind the drain valve, then drain valve stops up, and system also reports to the police, so that alert is in time fixed a breakdown, avoids impact to produce.Material at first enters the flash steam heat exchanger and carries out the heat exchange first time, and the temperature of flash-off steam is very larger than temperature of charge height and latent heat, has preferably heat transfer effect between material and the flash-off steam; Then material enters the main steam heat exchanger and carries out the heat exchange second time, raise when the temperature of material enters than just at this moment, but heat exchange is that the higher dry saturated steam of temperature and heat transfer coefficient are larger with it, continue to have kept good heat transfer effect, the mode of this countercurrent flow has totally kept very high heat exchange efficiency, and realized the cascade utilization of steam thermal energy, and guarantee that heat energy eats dried bleeding, guaranteed the efficiency of heat-exchange system.
As preferred version of the present invention, the top of described water-bath type saturated steam generator is equipped with automatic exhaust steam valve.Condensed water that small pump is mended upwards overflows with wet saturated steam after incoagulable gas is heated without deoxygenation; Because incoagulable gas is lighter than steam, so incoagulable gas is easy to gather at the equipment top.Because the temperature of incoagulable gas is lower than the temperature of steam, so when incoagulable gas gathered at the equipment top, the filling liquid in the automatic exhaust steam valve was shunk and made valve opening, incoagulable gas is effluxed; After the exhaust, be full of again steam in the automatic exhaust steam valve, temperature raises, and the filling liquid in the valve expands and makes valve closing; So automatic vent valve clearance automatic open close is discharged incoagulable gas.
As preferred version of the present invention, the top of described steam-water separator is equipped with automatic exhaust steam valve.
As preferred version of the present invention, the vapor phase space top of described main steam heat exchanger is equipped with vacuum breaker device and automatic exhaust steam valve.The vacuum breaker device can open and close automatically according to the pressure in the main steam heat exchanger, after system stops transport, along with the steam that remains in the system is condensed into condensed water gradually, the pressure of main steam heat exchanger vapor phase space reduces gradually, in case the pressure of main steam heat exchanger vapor phase space is lower than atmospheric pressure, the vacuum breaker device is opened automatically, air enters in the main steam heat exchanger, pressure with maintenance main steam heat exchanger vapor phase space is identical with atmospheric pressure, avoid vacuum to cause the equipment compression damage, prevent from simultaneously causing the condensed water suck-back, and avoid the equipment internal water accumulation that causes owing to the condensed water suck-back, metal erosion and heat-transfer surface fouling.
As preferred version of the present invention, be provided with the U-shaped water seal between the flash tank condensed water import of the outlet of described main steam heat exchanger drain valve and described flash tank.Under the normal condition, be filled with condensed water in the U-shaped water seal, condensed water speed and impulsive force that main steam heat exchanger drain valve is discharged are very large, and when flowing through the U-shaped water seal, the resistance of U-shaped water seal will make the flow velocity of condensed water descend, and impulsive force reduces, and plays the effect of energy dissipating.
As preferred version of the present invention, described the second temperature sensor is installed on the decline pipeline section of described U-shaped water seal.Temperature herein is more stable, and it is little to fluctuate, and is beneficial to measure accurately.
As preferred version of the present invention, the front and back of described main steam heat exchanger drain valve and flash steam heat exchanger drain valve are in series with respectively front hydrophobic stop valve and rear hydrophobic stop valve, and the entrance of described front hydrophobic stop valve and the outlet of described rear hydrophobic stop valve are parallel with the bypass cutoff valve.Close front hydrophobic stop valve and rear hydrophobic stop valve, open the bypass cutoff valve, can safeguard or change drain valve, do not affect the operation of system.
Description of drawings
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments, and accompanying drawing only provides reference and explanation usefulness, and is non-in order to limit the present invention.
Fig. 1 is the structural representation of the outer dry steam flash distillation two effect heat-exchange systems of the present invention.
Among the figure: 1. superheated steam; 2. Pressure gauge; 3. front steam stop; 4. pressure-control valve; 5. rear steam stop; 6. water-bath type saturated steam generator; 6a. current divider; 6b. water-bath type saturated steam generator exhaust steam valve; 6c. overflow valve; 6d. blowoff valve; 6e. water-bath type saturated steam generator automatic exhaust steam valve; 7. water-level gauge; 8. small pump; 9. steam-water separator; 9a. steam-water separator automatic exhaust steam valve; 9b. steam-water separator drain valve; 10. steam drying heat exchanger; 10a. saturated vapor import; 10a '. the saturated vapor outlet; 10b. superheated steam import; 10b '. the superheated steam outlet; 11. main steam heat exchanger; 11a. main steam heat exchanger material inlet; 11b. main steam heat exchanger material outlet; 11c. main steam heat exchanger steam inlet; 11d. main steam heat exchanger condensation-water drain; 11e. vacuum breaker device; 11f. main steam heat exchanger automatic exhaust steam valve; 11g. main steam heat exchanger drain valve; 11h.U shape water seal; 12. flash tank; 12a. flash tank condensed water import; 12b. flash tank condensation-water drain; 12c. flash tank level pressure overflow valve; 13. flash steam heat exchanger; 13a. flash steam heat exchanger material inlet; 13b. flash steam heat exchanger material outlet; 13c. flash steam heat exchanger steam inlet; 13d. flash steam heat exchanger condensation-water drain; 13e. flash steam heat exchanger drain valve; 15. water collect tank; 15a. water collect tank import; 15b. water collect tank outlet; 16a.PLC controller; 16b. the first temperature sensor; 16c. the second temperature sensor; 16d.DCS system; 16e. alarm.
The specific embodiment
As shown in Figure 1, outer dry steam flash distillation two effect heat-exchange systems of the present invention comprise overheated steam pipe, water-bath type saturated steam generator 6, small pump 8, steam-water separator 9, steam drying heat exchanger 10, main steam heat exchanger 11, flash tank 12, flash steam heat exchanger 13, water collect tank 15 and PLC controller 16a.
The cylindrical shell bottom of water-bath type saturated steam generator 6 is liquid Space, and cylindrical shell top is vapor phase space, and the roof of vapor phase space is provided with water-bath type saturated steam generator exhaust steam valve 6b, is provided with current divider 6a in the liquid Space of water-bath type saturated steam generator 6.The sidewall of water-bath type saturated steam generator 6 is equipped with water-level gauge 7 and overflow valve 6c, and overflow valve 6c can adopt Free Float Type Steam Trap.The outlet of small pump 8 links to each other with the bottom of water-bath type saturated steam generator 6 and replenishes an amount of condensed water according to the water level control signal of water-level gauge 7 in water-bath type saturated steam generator 6.The cylinder body bottom of water-bath type saturated steam generator 6 is equipped with blowoff valve 6d, and the outlet of blowoff valve 6d and overflow valve 6c all accesses delivery pipe.The top of water-bath type saturated steam generator 6 is equipped with water-bath type saturated steam generator automatic exhaust steam valve 6e.
On the export pipeline of water-bath type saturated steam generator exhaust steam valve 6b steam-water separator 9 and steam drying heat exchanger 10 are installed successively, the bottom of steam-water separator 9 is equipped with steam-water separator drain valve 9b, and the top of steam-water separator 9 is equipped with the steam-water separator automatic exhaust steam valve 9a of discharging incoagulable gas.
The main steam heat exchanger condensation-water drain 11d of main steam heat exchanger 11 is equipped with main steam heat exchanger drain valve 11g and U-shaped water seal 11h successively, the outlet of U-shaped water seal 11h is connected with the flash tank condensed water import 12a of flash tank 12, the flash tank condensation-water drain 12b of flash tank 12 is connected with the water collect tank import 15a of water collect tank 15, and the water collect tank outlet 15b of water collect tank 15 is connected with the entrance of small pump.
The top of flash tank 12 is equipped with flash tank level pressure overflow valve 12c, the outlet of flash tank level pressure overflow valve 12c is connected with the flash steam heat exchanger steam inlet 13c of flash steam heat exchanger 13, the flash steam heat exchanger condensation-water drain 13d of flash steam heat exchanger 13 is connected with flash steam heat exchanger drain valve 13e, and the outlet of flash steam heat exchanger drain valve 13e also is connected with water collect tank import 15a.
The material inlet pipe is connected with the flash steam heat exchanger material inlet 13a of flash steam heat exchanger 13, the flash steam heat exchanger material outlet 13b of flash steam heat exchanger 13 is connected with the main steam heat exchanger material inlet 11a of main steam heat exchanger 11, and the main steam heat exchanger material outlet 11b of main steam heat exchanger 11 connects material outlet pipe.The vapor phase space top of main steam heat exchanger 11 is equipped with vacuum breaker device 11e and main steam heat exchanger automatic exhaust steam valve 11f.
The first temperature sensor 16b is installed on the material outlet pipe, the second temperature sensor 16c is installed on the decline pipeline section of U-shaped water seal 11h, the holding wire of the first temperature sensor 16b and the second temperature sensor 16c accesses respectively the signal input part of PLC controller 16a, the aperture of the temperature signal controlled pressure control valve 4 that the control signal wire cut-in pressure control valve of PLC controller 16a, PLC controller 16a record according to the first temperature sensor 16b.The corresponding signal end of PLC controller 16a also is connected with the 16d of DCS system and alarm 16e.
The front and back of main steam heat exchanger drain valve 11g and flash steam heat exchanger drain valve 13e are in series with respectively front hydrophobic stop valve and rear hydrophobic stop valve, and the entrance of front hydrophobic stop valve and the outlet of rear hydrophobic stop valve are parallel with the bypass cutoff valve.
In the work, superheated steam 1 enters steam drying heat exchanger 10 through front steam stop 3 successively, superheated steam carries out indirect to saturated vapor in steam drying heat exchanger 10, superheated steam enters current divider 6a from the superheated steam outlet 10b ' outflow of steam drying heat exchanger 10 by pressure-control valve 4 and rear steam stop 5, lowered the temperature and overflowed from liquid Space from current divider 6a steam out, carry out carbonated drink separation through steam-water separator 9 after the water-bath type saturated steam generator exhaust steam valve 6b outflow of roof, Steam moisture reduces; The condensed water that separates is discharged from steam-water separator drain valve 9b, and the incoagulable gas of separation is discharged from steam-water separator automatic exhaust steam valve 9a; Then saturated vapor enters steam drying heat exchanger 10, and superheated steam carries out indirect to saturated vapor and makes it to become fully dry saturated steam in steam drying heat exchanger 10.
The main steam heat exchanger steam inlet 11c that the dry saturated steam that flows out from the saturated vapor of steam drying heat exchanger 10 outlet 10a ' enters main steam heat exchanger 11 carries out the indirect second time to material, discharged by main steam heat exchanger drain valve 11g from the condensed water that main steam heat exchanger condensation-water drain 11d flows out, through entering the flash tank condensed water import 12a of flash tank 12 behind the U-shaped water seal 11h, a part of condensed water flash becomes flash-off steam enters flash steam heat exchanger 13 from flash tank level pressure overflow valve 12c discharge flash steam heat exchanger steam inlet 13c in flash tank 12, flash-off steam carries out the indirect first time to material in flash steam heat exchanger 13, again becoming condensed water behind the flash-off steam release latent heat flows out from flash steam heat exchanger condensation-water drain 13d, enter water collect tank 15 through flash steam heat exchanger drain valve 13e discharge and from water collect tank import 15a, the condensed water of flash tank 12 also enters water collect tank 15, and the condensed water that flows out from water collect tank outlet 15b is pumped into the water-bath type saturated steam generator 6 by small pump 8.
Material enters flash steam heat exchanger material inlet 13a from the material inlet pipe, flash-off steam carries out the indirect first time to material in flash steam heat exchanger 13, then material flows out from flash steam heat exchanger material outlet 13b, 11a enters main steam heat exchanger 11 from main steam heat exchanger material inlet, dry saturated steam carries out the indirect second time to material in main steam heat exchanger 11, and last material flows out from main steam heat exchanger material outlet 11b and enters material outlet pipe.The first temperature sensor 16b surveys the temperature of material in the material outlet pipe and offers PLC controller 16a, and PLC controller 16a is according to the aperture of material outlet adjustment pressure-control valve 4, thus the pressure of steam supply of control water-bath type saturated steam generator.
The second temperature sensor 16c is by surveying the duty that the condensed water water temperature can perception main steam heat exchanger drain valve 11g, in case main steam heat exchanger drain valve 11g leaks, the temperature that the second temperature sensor 16c detects will be higher than the maximum temperature that PLC controller 16a sets, in case otherwise main steam heat exchanger drain valve 11g stop up, the temperature that the second temperature sensor 16c detects will be lower than the minimum temperature that PLC controller 16a sets.The temperature that the second temperature sensor 16c detects is not between maximum temperature that PLC controller 16a sets and minimum temperature the time, and PLC controller 16a drives alarm 16e and reports to the police, and to the 16d of DCS system transmitted signal.
Vacuum breaker device 11e can open and close automatically according to the pressure in the main steam heat exchanger 11, after system stops transport, along with the steam that remains in the system is condensed into condensed water gradually, the pressure of main steam heat exchanger 11 vapor phase spaces reduces gradually, in case the pressure of main steam heat exchanger 11 vapor phase spaces is lower than atmospheric pressure, vacuum breaker device 11e opens automatically, air enters in the main steam heat exchanger 11, pressure with maintenance main steam heat exchanger 11 vapor phase spaces is identical with atmospheric pressure, avoid vacuum to cause the equipment compression damage, prevent from simultaneously causing the condensed water suck-back, and avoid the equipment internal water accumulation that causes owing to the condensed water suck-back, metal erosion and heat-transfer surface fouling.When main steam heat exchanger 11 started, the vacuum breaker device was with autoshutdown.The vacuum breaker device preferably uses the strong T55 type of Taiwan Chinese vacuum breaker device, or the VB vacuum breaker device of Britain Si Paishake.
Because incoagulable gas is lighter than steam, gather so upwards be flowing in the top of equipment, because the temperature of incoagulable gas is lower than the temperature of steam, the filling liquid in the automatic exhaust steam valve is shunk and is made valve opening, incoagulable gas is effluxed; After the exhaust, be full of again steam in the automatic exhaust steam valve, temperature raises, and the filling liquid in the valve expands and makes valve closing; So automatic vent valve clearance automatic open close is discharged incoagulable gas.Automatic exhaust steam valve preferably adopts the strong S61 type of Taiwan Chinese automatic exhaust steam valve, or the product of the same type of Britain Si Paishake spirax, U.S. Armstrong armstrong.
The above only is the present invention's better possible embodiments, and is non-so limit to scope of patent protection of the present invention.In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop in the protection domain of requirement of the present invention.
Claims (7)
1. heat-exchange systems are imitated in an outer dry steam flash distillation two, comprise water-bath type saturated steam generator and small pump, the cylindrical shell bottom of described water-bath type saturated steam generator is liquid Space, cylindrical shell top is vapor phase space, the roof of described vapor phase space is provided with exhaust steam valve, be provided with current divider in the described liquid Space, described moisturizing delivery side of pump links to each other with the bottom of described water-bath type saturated steam generator, it is characterized in that: steam-water separator and steam drying heat exchanger are installed on the export pipeline of described water-bath type saturated steam generator exhaust steam valve successively, and the bottom of described steam-water separator is equipped with drain valve; The superheated steam import of described steam drying heat exchanger is connected with the steam source pipe road of superheated steam, the superheated steam outlet of described steam drying heat exchanger is equipped with the pressure-control valve that is controlled by the PLC controller, the outlet of described pressure-control valve is connected with the current divider of described water-bath type saturated steam generator, the saturated vapor import of described steam drying heat exchanger is connected with the outlet of described steam-water separator, the saturated vapor outlet of described steam drying heat exchanger is connected with the steam inlet of main steam heat exchanger, the outlet that the condensation-water drain of main steam heat exchanger is provided with drain valve and drain valve is connected with the condensed water import of flash tank, the condensation-water drain of flash tank is connected with the import of water collect tank, and the outlet of water collect tank is connected with the entrance of described small pump; The outlet that the top of described flash tank is equipped with level pressure overflow valve and level pressure overflow valve is connected with the steam inlet of flash steam heat exchanger, and the outlet that the condensation-water drain of flash steam heat exchanger is connected with drain valve and drain valve also is connected with the import of water collect tank; The material inlet pipe is connected with the material inlet of described flash steam heat exchanger, and the material outlet of flash steam heat exchanger is connected with the material inlet of described main steam heat exchanger, and the material outlet of main steam heat exchanger connects material outlet pipe; The first temperature sensor is installed on the described material outlet pipe, the outlet of described main steam heat exchanger drain valve is equipped with the second temperature sensor, the holding wire of described the first temperature sensor and the second temperature sensor accesses respectively the signal input part of described PLC controller, and the control signal wire of described PLC controller accesses described pressure-control valve.
2. heat-exchange systems are imitated in outer dry steam flash distillation two according to claim 1, and it is characterized in that: the top of described water-bath type saturated steam generator is equipped with automatic exhaust steam valve.
3. heat-exchange systems are imitated in outer dry steam flash distillation two according to claim 1, and it is characterized in that: the top of described steam-water separator is equipped with automatic exhaust steam valve.
4. heat-exchange systems are imitated in outer dry steam flash distillation two according to claim 1, and it is characterized in that: the vapor phase space top of described main steam heat exchanger is equipped with vacuum breaker device and automatic exhaust steam valve.
5. outer dry steam flash distillation two effect heat-exchange systems according to claim 1 is characterized in that: be provided with the U-shaped water seal between the outlet of described main steam heat exchanger drain valve and the condensed water import of described flash tank.
6. heat-exchange systems are imitated in outer dry steam flash distillation two according to claim 5, and it is characterized in that: described the second temperature sensor is installed on the decline pipeline section of described U-shaped water seal.
7. each described outer dry steam flash distillation two effect heat-exchange systems in 6 according to claim 1, it is characterized in that: the front and back of described main steam heat exchanger drain valve and flash steam heat exchanger drain valve are in series with respectively front hydrophobic stop valve and rear hydrophobic stop valve, and the entrance of described front hydrophobic stop valve and the outlet of described rear hydrophobic stop valve are parallel with the bypass cutoff valve.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107676767A (en) * | 2017-09-18 | 2018-02-09 | 上海众仕工程技术有限公司 | High steam flue gas heater big flow hydrophobic treatment system |
| CN108147358A (en) * | 2016-12-02 | 2018-06-12 | 孚雷德（北京）蒸汽节能技术有限公司 | A kind of oil truck Rapid steam heating energy-saving equipment |
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