CN116677985A - Multistage coupling type heat exchanger - Google Patents
Multistage coupling type heat exchanger Download PDFInfo
- Publication number
- CN116677985A CN116677985A CN202310692131.XA CN202310692131A CN116677985A CN 116677985 A CN116677985 A CN 116677985A CN 202310692131 A CN202310692131 A CN 202310692131A CN 116677985 A CN116677985 A CN 116677985A
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- Prior art keywords
- heat exchanger
- water
- heat exchange
- stage
- deoxidization
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- 230000008878 coupling Effects 0.000 title claims abstract description 14
- 238000010168 coupling process Methods 0.000 title claims abstract description 14
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 73
- 238000010438 heat treatment Methods 0.000 claims abstract description 27
- 239000007921 spray Substances 0.000 claims abstract description 21
- 238000005507 spraying Methods 0.000 claims abstract description 10
- 230000008901 benefit Effects 0.000 abstract description 12
- 239000012528 membrane Substances 0.000 description 15
- 238000009987 spinning Methods 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 238000003860 storage Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000002940 repellent Effects 0.000 description 2
- 239000005871 repellent Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006392 deoxygenation reaction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C3/00—Other direct-contact heat-exchange apparatus
- F28C3/06—Other direct-contact heat-exchange apparatus the heat-exchange media being a liquid and a gas or vapour
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/01—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using means for separating solid materials from heat-exchange fluids, e.g. filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F25/00—Component parts of trickle coolers
- F28F25/02—Component parts of trickle coolers for distributing, circulating, and accumulating liquid
- F28F25/06—Spray nozzles or spray pipes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention relates to a multistage coupling type heat exchanger, and belongs to the technical field of deoxidization heat exchange equipment. The device comprises an upper heat exchanger for water inlet mixed heat exchange during low-load operation of the treatment unit and a lower heat exchanger for water inlet mixed heat exchange during high-load operation of the treatment unit; the upper heat exchanger is connected with the lower heat exchanger; the upper heat exchanger comprises a water spraying disc type heating device; the lower heat exchanger comprises a rotary film atomizer device and a spray pipe type heating device. The multistage coupling type heat exchanger provided by the invention has the advantages of high stability, good heat exchange performance, good deoxidization performance, strong adjustable capacity, strong multiplexing Kuang Shi capability and high comprehensive benefit.
Description
Technical Field
The invention relates to a multistage coupling type heat exchanger, and belongs to the technical field of deoxidization heat exchange equipment.
Background
The hybrid deoxidizing heat exchanger is one of key devices of a regenerative system of a power station. The steam under a certain pressure is led into water, and the water is heated to the saturation temperature under the pressure of the container by utilizing the steam, so that the solubility of non-condensable gas in the water is reduced, the purposes of heat exchange and deoxidization are realized, and the purposes of heat exchange and prolonging the service life of power generation system equipment are achieved.
The structural feature of traditional split type deaerator is that the upper portion deoxidization head intercommunication lower part storage water tank, to the unit that needs to change operating mode increase heat supply function, traditional split type deoxidization heat exchanger's deoxidization heat exchange ability is not enough, can appear that the play oxygen content is too high, play water temperature is low the condition, can not satisfy the operation demand of complicated operating mode. The integrated deoxidizing heat exchanger with a single water tank is structurally characterized in that a heat exchange heating device is arranged in a water storage tank, steam is widely diffused in the water tank, but the unit is large in running vibration and high in heat energy loss when running under a low-load working condition. Therefore, the technical field needs a deoxidizing heat exchange device which can meet the variable working conditions of a power station, can be well adapted to the operation of a unit at the wave crest and the wave trough, and can improve the comprehensive benefit of the unit.
Disclosure of Invention
The invention aims to solve the technical problem of how to obtain the deoxidizing heat exchange device which can meet the variable working conditions of a power station, can be well adapted to the operation of a unit at the wave crest and the wave trough and can improve the comprehensive benefit of the unit.
In order to solve the problems, the technical scheme adopted by the invention is to provide a multistage coupling heat exchanger, which comprises an upper heat exchanger for water inlet mixed heat exchange during low-load operation of a processing unit and a lower heat exchanger for water inlet mixed heat exchange during high-load operation of the processing unit; the upper heat exchanger is connected with the lower heat exchanger; the upper heat exchanger comprises a water spraying disc type heating device; the lower heat exchanger comprises a rotary film atomizer device and a spray pipe type heating device.
Preferably, the lower heat exchanger further comprises a boiler starting drainage device, a jet pipe type auxiliary steam device and a drainage cavity.
Preferably, a stop valve is arranged between the upper heat exchanger and the lower heat exchanger.
Preferably, the rotary film atomizer device is of a two-stage type; the rotary film atomizer device comprises an upper-stage chamber and a lower-stage chamber which are communicated.
Preferably, a spring is arranged between the upper-stage chamber and the lower-stage chamber.
Compared with the prior art, the invention has the following beneficial effects:
the multistage coupling type heat exchanger provided by the invention has the advantages of high stability, good heat exchange performance, good deoxidization performance, strong adjustable capacity, strong multiplexing Kuang Shi capability and high comprehensive benefit.
Drawings
Fig. 1 is a simplified schematic diagram of a conventional split deaerator.
Fig. 2 is a simplified schematic diagram of a multi-stage coupled heat exchanger of the present invention.
Fig. 3 is a schematic structural view of the spinning-film atomizer.
Fig. 4 is a top view of fig. 3.
Fig. 5 is a schematic view of a flange-mounted rotary film atomizer.
Reference numerals: 1. a spinning film atomizer device; 2. a nozzle type heating device; 3. starting a drainage device of the boiler; 4. a jet pipe type auxiliary steam device; 5. a hydrophobic cavity; 6. a water-spraying disc type heating device; 7. a nozzle atomizer device; 8. an upper heat exchanger; 9. a lower heat exchanger; 10. a superior chamber; 11. a spring; 12. lower chamber
Detailed Description
In order to make the invention more comprehensible, preferred embodiments accompanied with the accompanying drawings are described in detail as follows:
as shown in fig. 1-5, the technical scheme adopted by the invention is to provide a multistage coupling heat exchanger, which comprises an upper heat exchanger 8 for water inlet mixed heat exchange during low-load operation of a treatment unit and a lower heat exchanger 9 for water inlet mixed heat exchange during high-load operation of the treatment unit; the upper heat exchanger 8 is connected with the lower heat exchanger 9; the upper heat exchanger 8 comprises a water spray type heating device 6; the lower heat exchanger 9 comprises a rotary film atomizer device 1 and a jet pipe type heating device 2. The lower heat exchanger 9 also comprises a boiler starting drainage device 3, a jet pipe type auxiliary steam device 4 and a drainage cavity 5. A stop valve is arranged between the upper heat exchanger 8 and the lower heat exchanger 9. The rotary film atomizer device 1 is of two stages; including an upper chamber 10 and a lower chamber 12 in communication. A spring 11 is provided between the upper chamber 10 and the lower chamber 12.
Examples
The invention solves the technical problem that the existing deoxidizing heat exchanger cannot be well adapted to the multi-working-condition operation required by a unit; other additional benefits may also be provided. 1. The low mute requirement of the unit under the starting pure condensation working condition can be met; 2. the requirement of switching the unit into large heat supply and deoxidization heat exchange is met; 2. the device can be used as a receiving device for a high-energy medium such as water drainage of a boiler, and has the functions of energy dissipation and emission reduction; 3. the energy storage device can be switched to store energy for the system.
The invention provides a multistage coupling type heat exchanger. The upper part of the heat exchanger is a horizontal-water spraying disc type heat exchange device, and the lower part is a horizontal-spray pipe type heat exchange device. The upper heat exchanger 8 comprises a water spray disc type heating device 6 and a nozzle atomizer device 7; the upper heat exchanger 8 consists of a spray heat exchange section and a deep heat exchange section, the spray heat exchange section is primarily atomized and deoxidized by a plurality of small-flow nozzles of the nozzle atomizer device 7, and meanwhile, the heat exchange area of water and heating steam is increased; the water is atomized by the nozzle and falls onto the water spraying disc, and further exchanges heat with the heating steam, so that deep deoxidization is realized.
The lower heat exchanger 9 comprises a rotary film atomizer device 1, a spray pipe type heating device 2, a boiler starting drainage device 3, a spray pipe type auxiliary steam device 4 and a drainage cavity 5; the lower heat exchanger 9 consists of a spray heat exchange section, a deep heat exchange section and a water storage tank.
The spray heat exchange section is characterized in that after condensate water is introduced into a water chamber at the upper part of the shell, the condensate water is atomized and sprayed out through the rotary film atomizer device 1 under the action of pressure difference, and enters the spray deoxidization section. In this space, the water is contacted with the heated steam for deoxygenation, and part of the non-condensable gases are removed in this space and vented to the atmosphere through an exhaust pipe. The upper water spraying disc type heat exchange device 6 is suitable for starting operation under the low-load working condition of the unit; the lower spray pipe type heat exchange device is started to operate under the high-load working condition of the unit. The multistage coupling type heat exchanger can meet the deoxidization heat exchange requirements of low-noise operation and high-load operation of the unit under the low-load working condition of the unit, and is an advanced deoxidization heat exchanger form.
The two-stage rotary film atomizer is used in the lower heat exchanger, and the atomization effect and the bearing capacity of the rotary film atomizer are important factors for directly determining the heat exchange efficiency of the coupled heat exchanger. By adopting the two-stage rotary film atomizer, the water drops are atomized very little, so that the heating process of the water drops and the diffusion process of dissolved gas in the water to a steam space are accelerated.
Working principle and characteristics of two-stage rotary film atomizer:
1. the two-stage design is adopted, the front stage adopts a capacity-expansion stable chamber, so that the fluid is fully and stably expanded, the rear stage adopts a rotary membrane diffuser, and the opening of the rotary membrane atomizer is automatically regulated by the rotary membrane diffuser according to the change of flow (the pressure difference between the front and the rear of the rotary membrane atomizer).
2. The high-performance spring 11 which is automatically adjusted according to the flow pressure difference and is specially designed is combined with the rotary membrane crushing and atomizing cavity, so that the device is good in centering property and high in stability, is suitable for the requirement of reciprocating operation, and can meet the requirement of flow regulation.
3. The spray angle of the spinning membrane atomizer is designed by a special spinning membrane, condensed water is tangentially ejected from a small hole with the special design to form a rotating water membrane which flows in a high-speed rotation way from top to bottom, a conical water membrane skirt is formed at the outlet of a spinning tube of the spinning membrane diffuser so as to achieve impact crushing, and heated steam enters a spinning spray area on the inner surface and the outer surface of the water membrane skirt to exchange energy with the condensed water, so that water drops are finally crushed and atomized by the high-efficiency spinning membrane. Because of entrainment effect of jet flow, water film rotating at high speed exchanges heat with heating steam, along with continuous heating of condensed water by steam and continuous reduction of pressure of jet hole jet water, non-condensed gases such as oxygen and air dissolved in water are gradually separated out, thereby achieving the purpose of high-efficiency deoxidization and greatly improving deoxidization effect.
4. The heat transfer coefficient is large, the deoxidization heat exchange effect is good, and the oxygen content of the effluent of the deoxidizer can be less than or equal to 5ppb when being matched with the deoxidizer.
5. The temperature rise of the water at the inlet and the outlet is large, and the use requirement of large-temperature-difference heat exchange is met.
6. The special spring is adjusted to allow the load to change rapidly, and the constant sliding pressure operation is realized.
7. The adaptability is strong, the stable operation of the unit under 10-110% rated load can be satisfied, the oxygen content of the discharged water reaches the national standard, and the time for reaching qualified dissolved oxygen is short.
8. Because the efficient rotary film is broken and atomized high, the heat exchange effect is sufficient, the steam consumption is low, the exhaust steam loss is small, the economic benefit of the unit is effectively improved, the exhaust loss is low, and the thermal efficiency of the unit is improved.
9. The rotary film atomizer can be suitable for poor water quality without blockage. Can filter the debris of great granule, in the spiral membrane atomizer bottom, can also pass through the spiral membrane atomizer gap through the debris of filter, the spiral membrane atomizer is from taking dirt collector, separates (will not remain in equipment after appropriate washing operation) the coarse grain in the main condensate water, and the maintenance is exempted from in a time installation.
10. The rated flow rate of the spinning film atomizer is 600T/H.
11. The pressure difference of the rotary film atomizer ranges from 0.2 to 0.98bar.
12. The spin-film atomizer spin-film diffuser is made of high-quality stainless steel, is resistant to scouring, and is suitable for long-term spraying.
13. The service life of the rotary film atomizer can meet the use requirement of a 30-year unit.
14. The body weighs about 80kg.
The rotary film atomizer device can be connected with an external pipeline through a flange, can be conveniently installed in the deaerator, is composed of metal plates, and is low in manufacturing difficulty and small in maintenance workload. By using the device, a large amount of water can be quickly and uniformly atomized and spread into the deaerator, and meanwhile, the vibration in the running process of the deaerator is effectively controlled. The device effectively improves the starting speed of the heat exchanger, reduces the running noise of the heat exchanger and the temperature gradient caused by uneven heating, improves the energy utilization rate, and reduces the cost of equipment purchasing and factory building investment, thereby improving the economical efficiency of power plant construction.
The multistage coupling type heat exchanger has the advantages of high stability, good heat exchange performance, good deoxidization performance, strong adjustable capacity, strong multiplexing Kuang Shi capability and high comprehensive benefit.
As shown in FIG. 1, the split deaerator is a traditional split deaerator, wherein the upper part is a heat exchange deaerator, and the lower part is a water storage tank.
As shown in fig. 2, the multi-stage coupling type heat exchanger is provided with a water spraying disc type heat exchanger at the upper part and a spray pipe type heat exchanger at the lower part. The lower heat exchanger 9 comprises a rotary film atomizer device 1, a spray pipe type heating device 2, a boiler starting drainage device 3, a spray pipe type auxiliary steam device 4 and a drainage cavity 5; the rotary film atomizer device 1 is arranged on the deaerator body through a flange and is used for primarily deaerating inlet water; the heating steam in the jet pipe type heating device 2 deeply heats and deoxidizes water in the water tank through the heat exchange pipe with the drill holes; the boiler starting drainage device 3 can drain water and dissipate energy when the boiler is started, is used for heating and deoxidizing, and reduces energy consumption; the jet pipe type auxiliary steam device 4 heats water in the water tank through the drilling heat exchange pipe; the water repellent cavity 5 is used for dredging the water discharged from the heat exchanger, so that heating steam is prevented from being mixed with water repellent;
in the starting stage, the lower heat exchanger 9 firstly raises the water level in the shell to the starting water level through the water inlet of the water inlet spraying device, and closes the water inlet; then the water temperature is slowly heated to about 130 ℃ by an auxiliary steam device. And continuously injecting water to the shell through the water inlet device to reach the normal water level, starting the main heating device, and keeping the heating state to enable the working condition in the shell to reach the normal working condition. When the unit runs under low load, the upper heat exchanger is started for deoxidizing, each air inlet pipeline of the lower heat exchanger is closed through the stop valve, and the heating deoxidizing function is stopped and only used as a water storage tank. When the unit operates under high load, the lower heat exchanger 9 is started for deoxidizing, the upper heat exchanger 8 stops operating, and the connecting pipelines of the upper part and the lower part are closed through the stop valve to isolate the upper heat exchanger 8.
As shown in fig. 3, the rotary film atomizer structure comprises an upper chamber 10, a spring 11 and a lower chamber 12. When the rotary film atomizer is in a working state, the inlet water is expanded in the upper-stage chamber 10, sprayed out through small holes in the lower-stage chamber 12, atomized and heated by steam to separate out non-condensable gas. The two chambers are in transitional buffer connection through the spring 11, when the two chambers are in a transportation state, the spring 11 is in an extension state, and the lower chamber 12 can be retracted into the upper chamber 10; when in operation, the spring 11 is in a compressed state and the lower chamber 12 extends out of the upper chamber 10.
The invention provides a multistage coupling type heat exchanger, which combines a water spray disc type heat exchanger and a spray pipe type heat exchanger and uses a fluid rotary film atomizer device; the low-load and high-load operation of the unit can be adapted, and the energy consumption of the deoxidizing equipment is reduced. The method can be used for a power plant with energy expansion transformation requirements, and can reduce cost and promote comprehensive benefits for power plant transformation.
While the invention has been described with respect to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Equivalent embodiments of the present invention will be apparent to those skilled in the art having the benefit of the teachings disclosed herein, when considered in the light of the foregoing disclosure, and without departing from the spirit and scope of the invention; meanwhile, any equivalent changes, modifications and evolution of the above embodiments according to the essential technology of the present invention still fall within the scope of the technical solution of the present invention.
Claims (5)
1. The multistage coupling type heat exchanger is characterized by comprising an upper heat exchanger for water inlet mixed heat exchange during low-load operation of a treatment unit and a lower heat exchanger for water inlet mixed heat exchange during high-load operation of the treatment unit; the upper heat exchanger is connected with the lower heat exchanger; the upper heat exchanger comprises a water spraying disc type heating device; the lower heat exchanger comprises a rotary film atomizer device and a spray pipe type heating device.
2. The multi-stage coupled heat exchanger of claim 1 wherein the lower heat exchanger further comprises a boiler start-up drain, a lance assist and a drain chamber.
3. The multi-stage coupled heat exchanger of claim 1, wherein a shut-off valve is disposed between the upper heat exchanger and the lower heat exchanger.
4. The multi-stage coupled heat exchanger of claim 1 wherein the rotary film atomizer device is of a two-stage type; comprises an upper-stage chamber and a lower-stage chamber which are communicated.
5. The multi-stage coupled heat exchanger of claim 4 wherein a spring is disposed between the upper and lower chambers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310692131.XA CN116677985A (en) | 2023-06-12 | 2023-06-12 | Multistage coupling type heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310692131.XA CN116677985A (en) | 2023-06-12 | 2023-06-12 | Multistage coupling type heat exchanger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116677985A true CN116677985A (en) | 2023-09-01 |
Family
ID=87780716
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310692131.XA Pending CN116677985A (en) | 2023-06-12 | 2023-06-12 | Multistage coupling type heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116677985A (en) |
-
2023
- 2023-06-12 CN CN202310692131.XA patent/CN116677985A/en active Pending
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