CN102878548B - Low humidity steam flash double effect heat exchange system - Google Patents
Low humidity steam flash double effect heat exchange system Download PDFInfo
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- CN102878548B CN102878548B CN201210393799.6A CN201210393799A CN102878548B CN 102878548 B CN102878548 B CN 102878548B CN 201210393799 A CN201210393799 A CN 201210393799A CN 102878548 B CN102878548 B CN 102878548B
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Abstract
The invention relates to a low humidity steam flash double effect heat exchange system. A liquid phase space in a water bath saturated steam generator is provided with a flow diverter, a steam drying heat exchanger is arranged on a steam discharge pipe of the flow diverter. Superheated steam enters into the flow diverter through a pressure control valve. Wet saturated steam from the saturated steam generator is heated by the superheated steam as dry saturated steam which enters into main steam heat exchanger to re-heat materials and form as high temperature condensed water. Flash steam after flash of the high temperature condensed water heats materials in the flash steam heat exchanger, and the flash steam condensed water enters into a water collecting tank and is pumped into the saturated steam generator by a water supplementing pump. A PLC (Programmable Logic Controller) adjusts the openness of the pressure control valve according to the temperature of a material outlet. The system utilizes cascaded steam heat energy and ensures that the steam heat energy is exhausted, so that the energy efficiency is improved.
Description
Technical field
The present invention relates to a kind of steam heat-exchanging system, particularly heat-exchange system is imitated in a kind of low humidity steam flash distillation two.
Background technology
During indirect heat exchange, 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 superheated steam source, need superheated steam to carry out desuperheat, reduce the degree of superheat.The general steam temp lowering device that adopts is as atomizing attemperator, non-contact attemperator etc., and after desuperheat, the degree of superheat is lower, and water entrained by steam is more serious, and steam quality is poorer.If desired vapor (steam) temperature is down to required saturation temperature corresponding to steam pressure of using, conventionally will uses water-bath type saturated steam generator, be called again 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, in liquid Space, be provided with current divider, overheated steam pipe stretches in water-bath type saturated steam generator and is connected with current divider, the sidewall of water-bath type saturated steam generator is provided with water level and takes into account overflow valve, pressure probe is installed on roof, moisturizing delivery side of pump is connected with the bottom of water-bath type saturated steam generator, and in water-bath type saturated steam generator, supplement appropriate condensed water according to the water level control signal of water-level gauge.Pressure gauge and pressure-control valve are installed on overheated steam pipe, and the saturated vapor pressure force signal that pressure probe records offers PLC controller, the aperture of PLC controller controlled pressure control valve.Superheated steam flows out from current divider, through becoming wet saturated steam with the water heat exchange cooling of liquid Space, upwards overflows, and from the water-bath type saturated steam generator exhaust steam valve of roof, flows out.The weak point of existing water-bath type saturated steam generator is: the moisture content in saturated vapor is higher, and steam quality is poor.
After vapor heat exchanger heat exchange, steam discharges latent heat, and is condensed into the high-temperature condensation water under uniform pressure, and high-temperature condensation water enters condensate pipe through drain valve.High-temperature condensation water enters after condensate pipe, along the continuous pressure drop of journey, and part high-temperature condensation water flash-off of steam, doubly, flow velocity increases approximately 10 times, very easily forms vapour locking in volumetric expansion more than 1000; After vapour locking, the back pressure of drain valve increases, and drain valve two ends pressure reduction reduces, and hydrophobic discharge capacity declines, and causes the condensed water producing in heat exchanger not get rid of in time, and heat exchanger efficiency declines, and temperature of charge can not reach technological requirement, thereby impact is normal, produces.For guaranteeing to produce, often need the unlatching stop valve in parallel with drain valve to carry out in line, the steam pressure that stop valve leaks has been offset vapour locking resistance; Though guaranteed production, steam utilization reduces, and 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, provide a kind of low humidity steam flash distillation two to imitate heat-exchange system, can reduce the moisture content in saturated vapor, make full use of the latent heat of steam and the sensible heat of condensed water.
For solving above technical problem, heat-exchange system is imitated in a kind of low humidity steam of the present invention 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, in described liquid Space, be provided with current divider, described moisturizing delivery side of pump is connected with the bottom of described water-bath type saturated steam generator, on the export pipeline of described water-bath type saturated steam generator exhaust steam valve, steam drying heat exchanger is installed, 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 provided with the pressure-control valve that is controlled by 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 water-bath type saturated steam generator exhaust steam valve, the saturated vapor outlet of described steam drying heat exchanger is connected with the steam inlet of main steam heat exchanger, the condensation-water drain of main steam heat exchanger is provided with the outlet of drain valve and drain valve and the condensed water import of flash tank is connected, the condensation-water drain of flash tank is connected with the import of water collect tank, 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 provided 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 is also connected with the import of water collect tank, 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 described material outlet pipe, the outlet of described main steam heat exchanger drain valve is provided 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 first carries out indirect to saturated vapor in steam drying heat exchanger, by pressure-control valve, enter again the current divider of water-bath type saturated steam generator, from current divider steam out, after lowering the temperature with the water heat exchange of liquid Space, becoming wet saturated steam upwards overflows, now the moisture content of saturated vapor is higher, from flowing out, the exhaust steam valve of roof enters steam drying heat exchanger, in steam drying heat exchanger, superheated steam carries out indirect to saturated vapor, make the aqueous water in wet saturated steam be evaporated to steam, become dry saturated steam.Dry saturated steam enters main steam heat exchanger material is carried out to indirect for the second time, after release latent heat, becomes high-temperature condensation water, and the high-temperature condensation water flowing out from main steam heat exchanger is discharged by drain valve.It is the flash-off steam that pressure is lower that high-temperature condensation water is sent into diffusion flash distillation in 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 in flash steam heat exchanger, discharges latent heat and material is carried out to indirect for the first time, and the flash-off steam discharging after latent heat is condensed into cryogenic condensation water.The cryogenic condensation water that the cryogenic condensation water of being discharged by flash steam heat exchanger drain valve and flash tank are discharged enters water collect tank, then is pumped in water-bath type saturated steam generator by small pump.The first temperature sensor is surveyed the temperature of material in material outlet pipe and is offered PLC controller, and PLC controller regulates the aperture of pressure-control valve according to material outlet temperature, thereby controls the pressure of steam supply of water-bath type saturated steam generator.The second temperature sensor is by surveying the duty that condensed water water temperature can perception main steam heat exchanger drain valve, the temperature that PLC controller is surveyed the second temperature sensor and maximum temperature and the minimum temperature of setting compare: if between maximum temperature and minimum temperature that after drain valve, condensate temperature is set between PLC controller, drain valve is working properly; If the maximum temperature that after drain valve, condensate temperature is set higher than PLC controller, trap leaking, system alarm, so that alert is safeguarded in time; If the minimum temperature that after drain valve, condensate temperature is set lower than PLC controller, drain valve stops up, and system is also reported to the police, so that alert is fixed a breakdown in time, avoids impact to produce.First material enters flash steam heat exchanger and carries out heat exchange for the first time, and the temperature of flash-off steam is higher and latent heat is very large than temperature of charge, has good heat transfer effect between material and flash-off steam; Then material enters main steam heat exchanger and carries out heat exchange for the second time, when now the temperature of material enters than just, raise, but heat exchange is that dry saturated steam and heat transfer coefficient that temperature is higher 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 dry 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 provided with automatic exhaust steam valve.Condensed water that small pump is mended, without deoxygenation, upwards overflows after incoagulable gas is heated together with wet saturated steam; Because incoagulable gas is lighter than steam, so incoagulable gas is easy to gather at equipment top.Because the temperature of incoagulable gas is lower than the temperature of steam, so when incoagulable gas gathers at equipment top, the filling liquid in automatic exhaust steam valve is shunk and made valve opening, incoagulable gas is by outer row; After exhaust, be full of again steam in automatic exhaust steam valve, temperature raises, and the filling liquid in valve expands and makes valve closing; So automatic vent valve clearance automatic open close, discharges incoagulable gas.
As preferred version of the present invention, the vapor phase space top of described main steam heat exchanger is provided with vacuum breaker device and automatic exhaust steam valve.Vacuum breaker device can open and close automatically according to the pressure in main steam heat exchanger, after system is stopped transport, along with the steam remaining in system is condensed into condensed water gradually, the pressure of main steam heat exchanger vapor phase space reduces gradually, once the pressure of main steam heat exchanger vapor phase space is lower than atmospheric pressure, vacuum breaker device is opened automatically, air enters in main steam heat exchanger, to keep the pressure of main steam heat exchanger vapor phase space identical with atmospheric pressure, avoid vacuum to cause equipment compression damage, prevent from causing condensed water suck-back simultaneously, and avoid the equipment internal water accumulation causing due to condensed water suck-back, metal erosion and heat-transfer surface fouling.
As preferred version of the present invention, between the flash tank condensed water import of the outlet of described main steam heat exchanger drain valve and described flash tank, be provided with U-shaped water seal.Under normal condition, in U-shaped water seal, be filled with condensed water, condensed water speed and impulsive force that main steam heat exchanger drain valve is discharged are very large, and while flowing through U-shaped water seal, the resistance of U-shaped water seal declines the flow velocity that makes condensed water, and impulsive force reduces, and plays the effect of energy dissipating.
As preferred version of the present invention, described the second temperature sensor is arranged on the decline pipeline section of described U-shaped water seal.Temperature is herein more stable, fluctuates little, is beneficial to and measures 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 bypass cutoff valve.Close front hydrophobic stop valve and rear hydrophobic stop valve, open bypass cutoff valve, can drain valve be safeguarded or be changed, do not affect the operation of system.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation, and accompanying drawing only provides reference and explanation use, non-in order to limit the present invention.
Fig. 1 is the structural representation that heat-exchange system is imitated in low humidity steam of the present invention flash distillation two.
In 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; 10. steam drying heat exchanger; The import of 10a. saturated vapor; 10a '. saturated vapor outlet; The import of 10b. superheated steam; 10b '. superheated steam outlet; 11. main steam heat exchangers; 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; The water seal of 11h.U shape; 12. flash tanks; The import of 12a. flash tank condensed water; 12b. flash tank condensation-water drain; 12c. flash tank level pressure overflow valve; 13. flash steam heat exchangers; 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 tanks; The import of 15a. water collect tank; The outlet of 15b. water collect tank; 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, heat-exchange system is imitated in low humidity steam of the present invention flash distillation two, comprises overheated steam pipe, water-bath type saturated steam generator 6, small pump 8, 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 provided 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 is connected with the bottom of water-bath type saturated steam generator 6 and in water-bath type saturated steam generator 6, supplements appropriate condensed water according to the water level control signal of water-level gauge 7.The cylinder body bottom of water-bath type saturated steam generator 6 is provided 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 provided 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 drying heat exchanger 10 is installed, Pressure gauge 2 and front steam stop 3 are installed on the steam source pipe road of superheated steam, the outlet of front steam stop 3 is connected with the superheated steam import 10b of steam drying heat exchanger 10, the superheated steam outlet 10b ' of steam drying heat exchanger 10 is connected with the import of the pressure-control valve 4 that is controlled by PLC controller 16a, and the outlet of pressure-control valve 4 is connected with the current divider 6a of water-bath type saturated steam generator 6 by rear steam stop 5.The saturated vapor import 10a of steam drying heat exchanger 10 is connected with the outlet of water-bath type saturated steam generator exhaust steam valve 6b, and the saturated vapor outlet 10a ' of steam drying heat exchanger 10 is connected with the main steam heat exchanger steam inlet 11c of main steam heat exchanger 11.
The main steam heat exchanger condensation-water drain 11d of main steam heat exchanger 11 is provided 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 provided 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 is also connected with water collect tank import 15a.
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 provided with vacuum breaker device 11e and main steam heat exchanger automatic exhaust steam valve 11f.
The first temperature sensor 16b is installed on 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 control signal wire cut-in pressure control valve of PLC controller 16a, the aperture of the temperature signal controlled pressure control valve 4 that PLC controller 16a records according to the first temperature sensor 16b.The corresponding signal end of PLC controller 16a is also connected with DCS system 16d 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 bypass cutoff valve.
In work, superheated steam 1 enters steam drying heat exchanger 10 through front steam stop 3 successively, in steam drying heat exchanger 10, superheated steam carries out indirect to saturated vapor, superheated steam from the superheated steam outlet 10b ' of steam drying heat exchanger 10 flow out by pressure-control valve 4 and steam stop 5 enter current divider 6a, from current divider 6a steam out, lowered the temperature and overflowed from liquid Space, from flowing out, the water-bath type saturated steam generator exhaust steam valve 6b of roof enters steam drying heat exchanger 10, in steam drying heat exchanger 10, superheated steam carries out indirect to saturated vapor and makes it to become completely dry saturated steam.
The main steam heat exchanger steam inlet 11c that the dry saturated steam flowing out from the saturated vapor outlet 10a ' of steam drying heat exchanger 10 enters main steam heat exchanger 11 carries out indirect for the second time to material, the condensed water flowing out from main steam heat exchanger condensation-water drain 11d is discharged by main steam heat exchanger drain valve 11g, after U-shaped water seal 11h, enter the flash tank condensed water import 12a of flash tank 12, in flash tank 12, a part of condensed water flash becomes flash-off steam and discharges and enter the flash steam heat exchanger steam inlet 13c of flash steam heat exchanger 13 from flash tank level pressure overflow valve 12c, in flash steam heat exchanger 13, flash-off steam carries out indirect for the first time to material, after flash-off steam release latent heat, again becoming condensed water flows out from flash steam heat exchanger condensation-water drain 13d, through flash steam heat exchanger drain valve 13e, discharge and enter water collect tank 15 from water collect tank import 15a, the condensed water of flash tank 12 also enters water collect tank 15, the condensed water flowing out from water collect tank outlet 15b is pumped into water-bath type saturated steam generator 6 by small pump 8.
Material enters flash steam heat exchanger material inlet 13a from material inlet pipe, in flash steam heat exchanger 13, flash-off steam carries out indirect for the first time to material, then material flows out from flash steam heat exchanger material outlet 13b, from main steam heat exchanger material inlet, 11a enters main steam heat exchanger 11, in main steam heat exchanger 11, dry saturated steam heats for the second time to material, and last material flows out and enters material outlet pipe from main steam heat exchanger material outlet 11b.The first temperature sensor 16b surveys the temperature of material in material outlet pipe and offers PLC controller 16a, and PLC controller 16a regulates the aperture of pressure-control valve 4 according to material outlet temperature, thereby controls the pressure of steam supply of water-bath type saturated steam generator.
The second temperature sensor 16c is by surveying the duty that condensed water water temperature can perception main steam heat exchanger drain valve 11g, once main steam heat exchanger drain valve 11g leaks, the temperature that the second temperature sensor 16c detects is by the maximum temperature of setting higher than PLC controller 16a, once otherwise main steam heat exchanger drain valve 11g stop up, the temperature that the second temperature sensor 16c detects by lower than PLC controller 16a set minimum temperature.In the time of between the maximum temperature that the temperature that the second temperature sensor 16c detects is not set at PLC controller 16a and minimum temperature, PLC controller 16a drives alarm 16e to report to the police, and to DCS system 16d transmitted signal.
Vacuum breaker device 11e can open and close automatically according to the pressure in main steam heat exchanger 11, after system is stopped transport, along with the steam remaining in system is condensed into condensed water gradually, the pressure of main steam heat exchanger 11 vapor phase spaces reduces gradually, once 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 main steam heat exchanger 11, to keep the pressure of main steam heat exchanger 11 vapor phase spaces identical with atmospheric pressure, avoid vacuum to cause equipment compression damage, prevent from causing condensed water suck-back simultaneously, and avoid the equipment internal water accumulation causing due to condensed water suck-back, metal erosion and heat-transfer surface fouling.When main steam heat exchanger 11 starts, vacuum breaker device will cut out automatically.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, so be upwards flowing in the top of equipment, gather, because the temperature of incoagulable gas is lower than the temperature of steam, the filling liquid in automatic exhaust steam valve is shunk and is made valve opening, and incoagulable gas is by outer row; After exhaust, be full of again steam in automatic exhaust steam valve, temperature raises, and the filling liquid in valve expands and makes valve closing; So automatic vent valve clearance automatic open close, discharges 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 foregoing is only the present invention's better possible embodiments, non-ly therefore 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 (6)
1. heat-exchange system is imitated in low humidity 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, in described liquid Space, be provided with current divider, described moisturizing delivery side of pump is connected with the bottom of described water-bath type saturated steam generator, it is characterized in that: on the export pipeline of described water-bath type saturated steam generator exhaust steam valve, steam drying heat exchanger is installed, 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 provided with the pressure-control valve that is controlled by 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 water-bath type saturated steam generator exhaust steam valve, the saturated vapor outlet of described steam drying heat exchanger is connected with the steam inlet of main steam heat exchanger, the condensation-water drain of main steam heat exchanger is provided with the outlet of drain valve and drain valve and the condensed water import of flash tank is connected, the condensation-water drain of flash tank is connected with the import of water collect tank, 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 provided 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 is also connected with the import of water collect tank, 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 described material outlet pipe, the outlet of described main steam heat exchanger drain valve is provided 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 system is imitated in low humidity steam according to claim 1 flash distillation two, it is characterized in that: the top of described water-bath type saturated steam generator is provided with automatic exhaust steam valve.
3. heat-exchange system is imitated in low humidity steam according to claim 1 flash distillation two, it is characterized in that: the vapor phase space top of described main steam heat exchanger is provided with vacuum breaker device and automatic exhaust steam valve.
4. heat-exchange system is imitated in low humidity steam according to claim 1 flash distillation two, it is characterized in that: between the outlet of described main steam heat exchanger drain valve and the condensed water import of described flash tank, be provided with U-shaped water seal.
5. heat-exchange system is imitated in low humidity steam according to claim 4 flash distillation two, it is characterized in that: described the second temperature sensor is arranged on the decline pipeline section of described U-shaped water seal.
6. according to the low humidity steam flash distillation two described in any one in claim 1 to 5, imitate heat-exchange system, 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 bypass cutoff valve.
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| CN201210393799.6A CN102878548B (en) | 2012-10-17 | 2012-10-17 | Low humidity steam flash double effect heat exchange system |
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| JP4674011B2 (en) * | 2001-08-31 | 2011-04-20 | サクラ精機株式会社 | Saturated steam generator |
| CN101630931B (en) * | 2009-08-13 | 2011-04-20 | 哈尔滨工程大学 | Combined power-generation device of nuclear power and alkali metal thermoelectricity conversion device |
| CN101791843B (en) * | 2010-01-11 | 2013-06-19 | 北京中拓机械有限责任公司 | Steam heating system for controlling quick temperature change of injection mold |
| CN102652543B (en) * | 2012-05-22 | 2013-06-12 | 江南大学 | Floating type liquid food material heating device |
| CN202884887U (en) * | 2012-10-17 | 2013-04-17 | 亿恒节能科技江苏有限公司 | Low-humidity steam flash evaporation two-effect heat exchanging device |
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