CN114659081A - Showering heat exchange sewage circulation flash evaporation steam generation system - Google Patents
Showering heat exchange sewage circulation flash evaporation steam generation system Download PDFInfo
- Publication number
- CN114659081A CN114659081A CN202210410848.6A CN202210410848A CN114659081A CN 114659081 A CN114659081 A CN 114659081A CN 202210410848 A CN202210410848 A CN 202210410848A CN 114659081 A CN114659081 A CN 114659081A
- Authority
- CN
- China
- Prior art keywords
- flash
- sewage
- tank
- steam
- heat exchanger
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B3/00—Other methods of steam generation; Steam boilers not provided for in other groups of this subclass
- F22B3/04—Other methods of steam generation; Steam boilers not provided for in other groups of this subclass by drop in pressure of high-pressure hot water within pressure- reducing chambers, e.g. in accumulators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D3/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium flows in a continuous film, or trickles freely, over the conduits
- F28D3/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium flows in a continuous film, or trickles freely, over the conduits with tubular conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D3/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium flows in a continuous film, or trickles freely, over the conduits
- F28D3/04—Distributing arrangements
Abstract
A showering heat exchange sewage circulation flash evaporation steam generation system belongs to the technical field of waste heat utilization and sewage treatment. In the steam generation system, a steam-liquid ejector adopts high-pressure steam to suck non-flash sewage gathered in a flash tank, the non-flash sewage enters a spray heat exchanger for heating after being pressurized, and then the non-flash sewage is sent to a sprayer to be flashed at the top of the flash tank; high-temperature sewage in the distribution tank is heated by pressure-boosting water in the spray heat exchanger, then is enriched in a water collecting tank, and is sent to the bottom of a flash tank to realize surging pressure-reducing flash; saturated sewage which is not flashed in the flash tank is communicated with an injection inlet of the vapor-liquid injector through an outlet pipe at the bottom, so that cyclic pressurization flash is realized. The steam generation system is driven by a small part of high-pressure steam, does not consume extra pump work, realizes waste heat gradient utilization of medium-high temperature sewage in a circulating pressurization mode, generates continuous and stable medium-low pressure saturated steam by combining flash evaporation up and down in a flash evaporation tank, provides a steam source for seawater desalination, sewage treatment or other steam utilization processes, realizes waste heat utilization of sewage, and saves energy and reduces emission.
Description
Technical Field
The invention relates to a showering heat exchange sewage circulating flash evaporation steam generation system, and belongs to the technical field of thickened oil thermal recovery, sewage treatment, seawater desalination and waste heat utilization.
Background
With the continuous development of petrochemical and energy utilization technologies, petroleum collection in China already enters a thick oil thermal collection stage, and the thick oil thermal collection mainly adopts the following technologies: steam huff and puff thermal recovery technology, steam driven thermal recovery technology, steam assisted gravity drainage thermal recovery technology and sub-layer combustion heat recovery technology.
The technology needs a large amount of steam and fresh water. A steam source system capable of supplying medium and low pressure steam to large and medium-sized multi-effect evaporation or multi-stage flash evaporation equal-heat seawater desalination or sewage treatment devices is important auxiliary equipment for heavy oil thermal recovery. And the temperature of the steam injection thermal recovery liquid is higher and can reach about 140 ℃, the waste heat of the heavy oil sewage and other industrial sewage is fully utilized, and the energy is saved and the emission is reduced.
Disclosure of Invention
The invention aims to provide a showering heat exchange sewage circulating flash evaporation steam generation system. Aiming at the problems that the temperature of some sewage is higher and the temperature fluctuation is larger, the steam temperature parameter is difficult to control stably when direct flash evaporation is used, and stable steam supply is difficult to realize when the flow of the sewage changes, a spray heat exchanger is adopted, the low-temperature sewage after the pressure of a steam-liquid ejector in the spray heat exchanger is heated by the high-temperature sewage, the low-temperature sewage is introduced into a sprayer at the top of a flash tank for spray flash evaporation after the temperature of the low-temperature sewage is raised to a saturated state or a nearly saturated state, the high-temperature sewage introduced from a distribution tank is subjected to heat exchange and temperature reduction by the spray heat exchanger, is enriched in a water collecting tank at the bottom of the spray heat exchanger and is conveyed into the bottom of the flash tank for continuous flash evaporation, so that the condition of up-and-down combined flash evaporation is formed in the flash tank, the flash evaporation rate of the sewage can be greatly improved, the energy gradient utilization of the high-temperature sewage is realized, and the stability of a steam generation system under the condition of variable flow or small flow of the sewage is ensured in a circulating flash evaporation mode, provides a continuous, stable and reliable steam source for seawater desalination or sewage treatment equipment.
The technical scheme adopted by the invention is as follows: a spray heat exchange sewage circulation flash evaporation steam generation system comprises a distribution tank, a spray heat exchanger, a water gathering tank, a sprayer, a flash tank and a steam-liquid ejector, wherein all the devices are connected by pipelines; the steam-liquid ejector is driven by high-pressure steam, an injection fluid inlet is connected with a water outlet at the bottom of the flash tank, the steam-liquid ejector boosts the pressure and then sends the boosted pressure to the shower heat exchanger for heating, and a heat exchange tube outlet of the shower heat exchanger is connected with a sprayer inlet in the flash tank, so that the boosted and heated saturated or near-saturated water is sprayed and flashed at the top of the flash tank; the heat source of the spray heat exchanger is medium-high temperature sewage, the sewage firstly enters a distribution tank at the top of the spray heat exchanger, the sewage is sprayed on a heat exchange tube of the spray heat exchanger at the bottom of the distribution tank, is heated by pressure boosting water in the heat exchange tube and then is collected in a water collection tank at the bottom of the spray heat exchanger, the water collection tank is connected with a bottom water inlet of a flash tank and is further sent to the bottom of the flash tank for flash evaporation, so that the condition of up-and-down combined flash evaporation is formed in the flash tank, and the non-flash evaporation sewage at the bottom of the flash tank is sent to a vapor-liquid ejector through a lead-out pipe, so that the cyclic flash evaporation is realized.
The top of the spray heat exchanger of the steam generation system is a distribution tank, the heat exchange tubes are coiled tubes, the bottom of the spray heat exchanger is a water collecting tank, and the adopted technical scheme is as follows: the bottom of the spray pond is provided with a hole, sewage is sprayed on a heat exchange coil of the spray heat exchanger through the spray hole to form falling film flow, pressure boosting water in the heat exchange pipe is heated, then is enriched in a water collecting tank at the bottom of the spray heat exchanger and is introduced into the bottom of a flash tank to be continuously flashed, and therefore energy gradient utilization of high-temperature sewage is achieved; volatile gas in the sewage excited by falling film flow is discharged from a volatile gas discharge port arranged at the upper part of the shower heat exchanger.
The top of a flash tank of the steam generation system is provided with a sprayer, pressure boosting water at the outlet of a steam-liquid ejector enters a water inlet at the middle position of the top of the sprayer after being heated by a spray heat exchanger, the bottom of the sprayer is provided with a hole to form spray flash, and flash steam is led out from a steam outlet above the sprayer.
The bottom inlet position of a flash tank of the steam generation system is connected with sewage enriched in a water collecting tank after falling film heating of a spray heat exchanger, a water baffle is arranged at the inlet position, the bottom of the flash tank is divided into a spraying flash chamber and a surface flash chamber, the sewage is sprayed in the spraying flash chamber for pressure reduction and flash evaporation, overflows the water baffle to form turbulence, and is mixed with non-flash water sprayed in the surface flash chamber to form surface flash evaporation, so that the flash evaporation effect is enhanced; and an overflow pipe is arranged on the other side of the flash tank, the water level in the flash tank is controlled, and concentrated sewage is discharged.
The invention has the beneficial effects that: the spraying heat exchanger is utilized to heat the circulating boosting sewage pumped by the vapor-liquid ejector, and the circulating boosting sewage is sent to the sprayer at the top of the flash tank for spraying and flash evaporation, and the medium-high temperature sewage is sent to the bottom of the flash tank for further flash evaporation after heat exchange and temperature reduction, and the pressure reduction and flash evaporation of the supercooled high-pressure sewage after temperature reduction are realized in a spraying mode, so that the energy gradient utilization of the medium-high temperature sewage is realized, the upper and lower combined flash evaporation condition is formed in the flash tank, and the flash evaporation rate is improved; meanwhile, the steam source system is driven by only a small part of high-pressure steam, the cyclic pressure-boosting flash evaporation of the low-temperature sewage is realized by utilizing the steam-liquid ejector, and the flash evaporation temperature of the medium-high temperature sewage is reduced, so that multiple times of low-pressure steam with proper temperature and pressure can be prepared, and no extra pumping work is consumed; the continuous operation of the steam generation system under the condition of sewage flow and temperature change is ensured, a stable and reliable steam source is provided for seawater desalination and sewage treatment, the gradient utilization of the waste heat of the sewage is realized, and the effects of energy conservation and emission reduction are achieved.
Drawings
FIG. 1 is a schematic diagram of a showering heat exchange sewage circulating flash steam generation system.
In the figure: 1. the device comprises a distribution tank, 2, a spray heat exchanger, 3, a water collection tank, 4, a sprayer, 5, a flash tank, 6, a vapor-liquid injector, 7, a volatile gas outlet, 8, a water baffle, 8a, a gushing flash chamber, 8b, a surface flash chamber, 9 and an overflow pipe.
Detailed Description
The technical solution in the implementation of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention.
FIG. 1 shows a device diagram of a showering heat exchange sewage circulating flash evaporation steam generation system.
The steam generation system provided by the invention comprises a distribution pool 1, a spray heat exchanger 2, a water collecting tank 3, a sprayer 4, a flash tank 5 and a steam-liquid ejector 6, wherein all the devices are connected by adopting pipelines; the upper part of the spray heat exchanger 2 is provided with a volatile gas outlet 7, and the flash tank 5 is provided with a water baffle 8 and an overflow pipe 9; in the steam generation system, a steam-liquid ejector 6 is driven by high-pressure steam, non-flash saturated sewage gathered in a flash tank 5 is sucked, the temperature and the pressure are increased, the non-flash saturated sewage is sent into a spray heat exchanger 2 to be further heated by medium-high temperature industrial sewage, and the non-flash saturated sewage is sent into a sprayer 4 to be sprayed and flashed on the top of the flash tank 5 after the temperature is increased to a saturated or nearly saturated state; the heating heat source sewage of the spray heat exchanger 2 is collected outside and conveyed to a water distribution tank 1 at the top of the spray heat exchanger 2, is sprayed on a snakelike heat exchange tube of the spray heat exchanger 2 through a spraying hole at the bottom of the water distribution tank 1 to form falling film flow, partial heat is transferred to the boosted water in the spray heat exchanger 2, then the temperature is reduced, the boosted water is collected in a water collection tank 3 at the bottom of the spray heat exchanger 2 and is further conveyed to a flash tank 5 for flash evaporation at the bottom, so that upper and lower combined flash evaporation is formed with the spray flash evaporation at the top, the flash evaporation rate is improved, the energy gradient utilization of medium-high temperature sewage is realized, the steam generating system is enabled to keep relatively stable and moderate flash evaporation temperature, and the application of high-temperature sewage flash evaporation steam in low-temperature multi-effect evaporation seawater desalination or sewage treatment is facilitated; the sewage which is not flashed at the bottom of the flash tank 5 is pumped to an injection inlet of the vapor-liquid injector 6, so that the circulating pressurization flash is realized, and the steam yield is improved.
As shown in fig. 1, a hole is formed in the bottom of the distribution tank 1 at the top of the shower heat exchanger 2 in the steam generation system, sewage is sprayed on the heat exchange coil of the shower heat exchanger 2 through the spraying hole to form falling film flow, and volatile gas in the sewage excited by the falling film flow is discharged from a volatile gas outlet 7 arranged at the upper part of the shower heat exchanger 2.
The top of a flash tank 5 of the steam generation system is provided with a sprayer 4, the pressure boosting water heated by the spray heat exchanger 2 enters a water inlet at the middle position of the top of the sprayer 4, the bottom of the sprayer 4 is provided with a hole to form spray flash, and flash steam is led out from a steam outlet above the position of the sprayer 4.
The bottom inlet position of a flash tank 5 of the steam generation system is connected with sewage enriched in a water collecting tank 3 at the bottom of a trickle heat exchanger 2, a water baffle 8 is arranged at the flash water inlet position, the flash tank 8 is divided into a gushing flash chamber 8a and a surface flash chamber 8b, so that the cooled high-pressure supercooled sewage forms gushing decompression flash, turbulent mixing is enhanced through the water baffle, the surface flash rate is improved, and meanwhile, concentrated sewage is separated; the opposite side of flash tank 5 sets up overflow pipe 9, and its highly is less than the breakwater top to control flash tank 5 middle water level, discharge dense sewage, realize the regulation and control of steam generator flash distillation process under the different sewage flow through water level control, both can be applied to low flow sewage occasion, also can satisfy large-scale sewage waste heat utilization's engineering demand.
Claims (2)
1. A spray type heat exchange sewage circulation flash evaporation steam generation system comprises a distribution tank (1), a spray type heat exchanger (2), a water collecting tank (3), a sprayer (4), a flash evaporation tank (5) and a steam-liquid ejector (6), wherein all the devices are connected through pipelines; the steam-liquid ejector (6) is connected with an injection fluid inlet and a water outlet at the bottom of the flash tank (5), an outlet of the steam-liquid ejector (6) is connected with an inlet of a heat exchange tube of the spray heat exchanger (2), an outlet of the heat exchange tube of the spray heat exchanger (2) is connected with an inlet of a sprayer (4) in the flash tank (5), a water distribution tank (1) is arranged at the top of the spray heat exchanger, a water collection tank (3) is arranged at the bottom of the spray heat exchanger, and the water collection tank (3) is connected with a water inlet at the bottom of the flash tank (5);
the method is characterized in that: the steam generation system drives a steam-liquid ejector (6) by high-pressure steam, sucks sewage in a flash tank (5), pressurizes the sewage, enters a spray heat exchanger (2) for further heating, and then is sent to a sprayer (4) to be flashed at the top of the flash tank (5); the sprayer (4) adopts a top-middle water inlet mode, the bottom of the sprayer (4) is provided with a hole to form spraying flash evaporation, and flash evaporation steam is led out from a steam outlet above the position of the sprayer (4);
the heating heat source of the spray heat exchanger (2) is high-temperature sewage of the distribution pool (1), the high-temperature sewage is enriched in a water collecting tank (3) at the bottom after being heated by the boosted water in the spray heat exchanger (2), the enriched sewage is further sent to the bottom of a flash tank (5) for flash evaporation, and a water baffle plate (8) is arranged at the inlet position of the flash tank; the water baffle (8) divides the bottom of the flash tank (5) into a gushing flash chamber (8 a) and a surface flash chamber (8 b); an overflow pipe (9) is arranged on the side wall of the surface flash evaporation cavity (8 b), and the top of the water baffle (8) is higher than the overflow pipe (9); the non-flash sewage at the bottom of the flash tank (5) is sent to a vapor-liquid ejector (6) through an eduction pipe to realize circulating flash evaporation.
2. The showering type heat exchange sewage circulation flash evaporation steam generation system as claimed in claim 1, wherein: sewage is converged into a distribution tank (1), and a hole is formed in the bottom of the distribution tank (1) to enable the sewage to spray a coiled pipe of a spray heat exchanger (2) to form falling film flow so as to heat the rising water in the spray heat exchanger (2); a volatile gas outlet (7) is arranged at the upper part of the shower heat exchanger (2), and volatile gas in the sewage is excited due to falling film flow and is discharged from the outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210410848.6A CN114659081A (en) | 2022-04-19 | 2022-04-19 | Showering heat exchange sewage circulation flash evaporation steam generation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210410848.6A CN114659081A (en) | 2022-04-19 | 2022-04-19 | Showering heat exchange sewage circulation flash evaporation steam generation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114659081A true CN114659081A (en) | 2022-06-24 |
Family
ID=82034730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210410848.6A Pending CN114659081A (en) | 2022-04-19 | 2022-04-19 | Showering heat exchange sewage circulation flash evaporation steam generation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114659081A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115493311A (en) * | 2022-09-29 | 2022-12-20 | 北京理工大学 | Flash evaporation and falling film evaporation composite heat exchange system and operation method thereof |
-
2022
- 2022-04-19 CN CN202210410848.6A patent/CN114659081A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115493311A (en) * | 2022-09-29 | 2022-12-20 | 北京理工大学 | Flash evaporation and falling film evaporation composite heat exchange system and operation method thereof |
| CN115493311B (en) * | 2022-09-29 | 2023-10-27 | 北京理工大学 | Flash evaporation and falling film evaporation composite heat exchange system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN211056755U (en) | Low-temperature efficient atomization injection seawater desalination device | |
| CN205307834U (en) | Absorption heat pump sea water desalination device of recovery waste heat | |
| CN103112985B (en) | Multi-stage flash distillation seawater desalination system of low-temperature multi-effect steamer vapor compression distillation | |
| CN104445481A (en) | Waste heat electricity-water coproduction system | |
| CN105417606A (en) | Multi-effect distillation and multi-stage flash evaporation solar sea water desalination method | |
| CN114659081A (en) | Showering heat exchange sewage circulation flash evaporation steam generation system | |
| CN109867317A (en) | A kind of efficient cryogenic atomization injection desalination plant and its method | |
| CN104399267B (en) | A kind of flash distillation wave steam recompression continuous evaporation system | |
| CN108286728A (en) | A kind of power plant's step heating system | |
| CN217235545U (en) | Showering heat exchange sewage circulation flash evaporation steam generation system | |
| WO2023284061A1 (en) | Steam source system based on steam-liquid ejector pressurization and flashing technology | |
| CN104058474B (en) | Pulsation flash distillation Natural Circulation solar energy sea water desalination apparatus | |
| WO2008138212A1 (en) | Multitower energysaving distillation system | |
| CN203384963U (en) | Steam return water waste heat recovery device | |
| CN213231586U (en) | Solar seawater desalination device | |
| CN210367048U (en) | Double-stage preheating thermal power steam compression type vertical pipe climbing film evaporation sea water desalination device | |
| CN207507035U (en) | A kind of recovery system of steam condensate (SC) | |
| CN207468388U (en) | A kind of both vapor compression distills water purification installation | |
| US20230018348A1 (en) | Vapor source system based on vapor-liquid ejector supercharging combined with flash vaporization technology | |
| CN203112537U (en) | Self-cleaning evaporative crystallization device for high-salt sewage | |
| CN107459198B (en) | A kind of small steam compression distillation water purification system | |
| CN203323091U (en) | Oilfield sewage waste heat recovery and reclaimed water use device | |
| CN101684009A (en) | Method for desalinizing seawater | |
| CN108706669A (en) | A kind of no vapour source room temperature negative pressure sea water distillation plant | |
| RU2812625C1 (en) | Batch-type vacuum deaerator for heating and hot water systems (two embodiments) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |