LU504285B1 - Circular Water Waste Heat Utilization System for Indirect Air Cooling Unit - Google Patents
Circular Water Waste Heat Utilization System for Indirect Air Cooling Unit Download PDFInfo
- Publication number
- LU504285B1 LU504285B1 LU504285A LU504285A LU504285B1 LU 504285 B1 LU504285 B1 LU 504285B1 LU 504285 A LU504285 A LU 504285A LU 504285 A LU504285 A LU 504285A LU 504285 B1 LU504285 B1 LU 504285B1
- Authority
- LU
- Luxembourg
- Prior art keywords
- circulating water
- air
- waste heat
- cooling unit
- utilization system
- Prior art date
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 96
- 238000001816 cooling Methods 0.000 title claims abstract description 39
- 239000002918 waste heat Substances 0.000 title claims abstract description 37
- 238000000605 extraction Methods 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000010521 absorption reaction Methods 0.000 claims description 12
- 239000000498 cooling water Substances 0.000 claims description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 7
- 239000003546 flue gas Substances 0.000 claims description 7
- 229940092727 claro Drugs 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 description 13
- 238000005057 refrigeration Methods 0.000 description 8
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B27/00—Machines, plants or systems, using particular sources of energy
- F25B27/02—Machines, plants or systems, using particular sources of energy using waste heat, e.g. from internal-combustion engines
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
A circulating water waste heat utilization system of indirect air cooling unit and operation method thereof, comprising steam turbine, condenser, ejector, heat exchanger and air heater; the exhaust port of the steam turbine is connected with the hot side inlet of the condenser, the steam extraction port of the steam turbine is connected with the steam side inlet of the ejector, the circulating water branch of the cold side outlet of the condenser is connected with the water side inlet of the ejector, the outlet of the ejector is connected with the hot side inlet of the heat exchanger, and the hot side outlet of the heat exchanger is connected with the hot side inlet of the air heater; the hot side outlet of the air heater is connected with the circulating water branch of the cold side inlet of the condenser.
Description
1 LU504285
Circular Water Waste Heat Utihzation System for Indirect Air Cooling Unit
The invention belongs to the technical field of energy comprehensive utilization, particularly relates to circular water waste heat utiization system for indirect air cooling umt,
Cold source loss accounts for the largest proportion of all losses in the current generator set. Usually, this part of heat is taken away by circulating water and then enters the atmospheric environment. If it can be recycled, the economy of the unit can be greatly improved. Although this part of waste heat is large, it is difficult to recycle because of the low quality of circulating water waste heat.
Due to the low design back pressure of water cooling unit, the exhaust of low-pressure cylinder is inconvenient to be directly used. At present, the other heat utilization methods are mainly absorption heat pump heating and high back pressure heating, but when high back pressure heating is carried out, it is necessary to replace the rotor of low-pressure cylinder of steam turbine. However, air-cooled units have the characteristics of high design back pressure, and the utilization rate of waste heat is constantly improving. However, the existing scheme of waste heat utilization for air-cooled units is mainly based on absorption heat pump for direct air-cooled units, and the system is complicated and the reconstruction cost is high. However, the waste heat utilization of indirect air cooling unit is less, but there is more room for other heat utilization; therefore, the scheme of waste heat utilization of indirect air cooling unit needs to be put forward.
Aiming at the problems existing in the prior art, the invention aims to provide an indirect air cooling unit circulating water waste heat utilization system, which is used for external
2 LU504285 heating or refrigeration after being heated by high-temperature extraction and injecting circulating water, and the waste heat is also recycled by a heater.
The invention 1s realize by that following technical scheme:
À circulating water waste heat utilization system of indirect air cooling unit, comprising a steam turbine, a condenser, an ejector, a heat exchanger and an air heater; the exhaust port of the steam turbine is connected with the hot side inlet of the condenser, the steam extraction port of the steam tnrbine is connected with the steam side inlet of the ejector, the circulating water branch of the cold side outlet of the condenser is connected with the water side inlet of the ejector, and the outlet of the gjector is connected with the hot side iniet of the heat exchanger; the hot side outlet of the air heater is connected with the circulating water branch of the cold side inlet of the condenser.
Preferably, a first control valve is arranged between the steam extraction port of the steam turbine and the steam side inlet of the ejector.
Preferably, à second control valve is arranged between the circulating water branch of the cold side outlet of the condenser and the water side inlet of the ejector.
Preferably, it also comprises a cooling tower, and the cold side of the condenser is connected with the cooling tower
Preferably, it also comprises an air preheater, and the cold side outlet of the air heater ig connected with the cold side inlet of the air preheater
Preferably, the outlet of the hot side of the air preheater is provided with a low-temperature economizer.
Preferably, the hot air side outlet of the air preheater 1s connected to the wind side inlet of the boiler; the flue gas side inlet of the air preheater is connected to the flue gas outlet of the
Boiler,
Preferably, the high-temperature water of the heat exchanger 1s connected to a heat user.
Preferably, the cold side inlet of the air heater is connected to a cold air source,
An operation method of circulating water waste heat utilization system of indirect air cooling unit, which is based on the indirect air cooling unit circulating water waste heat utilization system; including: a stream of high-temperature steam is pumped from the steam turbine into the ejector, and mixed with the hot water of the circulating cooling water branch at the cold side outlet of the condenser in the ejector and heated, and the heated high-temperature water is externally radiated in the heat exchanger, and the hot water radiated externally in the heat exchanger heats cold air in the air heater, the air after heat absorption enters the boiler after
3 LU504285 being heated by the air preheater, and the cold water after heat release enters the condenser after being mixed with circulating cooling water.
Compared with the prior art, the invention has the following beneficial technical effects.
The invention aims to provide a circulating water waste heat utilization system of an indirect air-cooled unit and an operation method thereof The circulating water waste heat utilization system of the indirect air-cooled unit is used for external heating or refrigeration after being heated by impecting curcolating water through high-temperature steam extraction, and the waste heat is also recycled by an air beater. The system can effectively recycle the heat of circulating water, greatly improve the economy of the unit, have greater energy-saving benefits, and effectively avoid the corrosion and blockage of an air preheater
Further, the system of the invention adopts the cooperation of the air heater and the low- temperature economizer, so that on the one hand, the inlet temperature of the air preheater can be increased, and the corrosion and blockage of the air preheater can be effectively avoided;
On the other band, it can improve the combustion conditions of the boder, improve the efficiency of the boiler and reduce the heat consumption of the steam turbine, which has great energy-saving benefits,
Further, the system of the invention adopts the sjector to realize high-temperature steam extraction and heating of circulating water, and compared with the mode of utilizing the residual beat of circulating water through an absorption beat pump, the system has the advantages of simple structure, no moving parts, reliable operation and low reconstruction cost.
Further, the system of the invention is provided with a first control valve in the steam extraction pipeline for adjusting the steam extraction amount; a second control valve is installed in the circulating water branch to adjust the injected circulating water How, when the sysiern runs in winter, the temperature of circulating water ts low, so the first control valve can be turned up and the second control valve can be turned down to ensure that the injected hot water can meet the demand of external heating load when it releases heat in the heat exchanger, when the system 1s running in summer, high circulating water temperature will lead to high back pressure of the steam turbine and decrease the circulating efficiency By turning up the first control valve and the second control valve, the circulating water flow of the condenser can be increased to reduce the circulating back pressure, and at the same time, the injected bot water drives absorption refrigeration in the heat exchanger to meet the cooling capacity demand in summer,
4 LU504285
Fig. 1 is a schematic structural diagram of a circulating water waste heat utilization system of an indirect air cooling uni.
Wherein: steam turbine 1, condenser 2, cooling tower 3, gjector 4, heat exchanger 5, air heater 6, air preheater 7, low temperature economizer 8, first control valve © and second control valve 10.
In order to make people in the technical field better understand the scheme of the invention, the technical scheme in the embodiment of the invention will be described clearly and completely with the attached drawings. Obviously, the described embodiment is only a part of the embodiment of the invention, but not the whole embodiment. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work should belong to the scope of protection of the present invention,
It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data thus used are interchangeable under appropriate circumstances, so that the embodiments of the invention described herein can be implemented in other orders than those illustrated or described herein. Furthermore, the terms “including” and "having" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or equipment that includes a series of steps or units is not necessarily limited to those explicitly
Listed, but may include other steps or units not explicithy Hated or wherent to such processes, methods, products or equipment.
The present invention will be described in further detail with reference to the attached drawings. As shown in Figure 1, itis a schematic structural diagram of a circulating water waste heat utilization system of an indirect air cooling unit. Provide extraction and condenser 2: used to cool the exhaust gas of steam turbine into condensed water; cooling tower 3: used to dissipaie the heat of circulating water to the environment; ejector 4: used to realize mixed heating of circulating water by high-temperature extraction, heat exchanger 5: used to transfer heat to heat users or drive absorption refrigeration and air beater 6: used to heat cold air entering air preheater; air preheater 7: used to heat air entering boiler by flue gas: low-temperature economizer 8 used to heat water supply and air heater by thie gas The system of the invention adopts the ejector to realize high-temperature steam extraction and heating of circulating water, and compared with the mode of utilizing the residual heat of circulating water through an absorption heat pump, the system has the advantages of simple structure, no moving parts, reliable operation and low reconstruction cost.
As shown in Figure 1, 1115 a schematic structural diagram of a circulating water waste heat utilization system of an indirect air cooling unit, and the connection relationship of each device as follows. including a steam turbine 1, a condenser 2, an gjector 4, a heat exchanger 5 and an air heater 6,
The exhaust port of the steam turbine | is connected with the hot side inlet of the condenser 2, the steam extraction port of the steam turbine 1 1s connected with the steam side inlet of the eiector 4, the circulating water branch of the cold side outlet of the condenser 2 is connected with the water side inlet of the ejector 4, the outlet of the ejector 4 1s connected with the hot side inlet of the heat exchanger 5, the hot side outlet of the heat exchanger $ is connected with the hot side iniet of the air beater 6, and the hot side outlet of the air beater 6 15 connected with the circulating water branch of the cold side inlet of the condenser 2. The Invention aims to provide an indirect air cooling unit circulating water waste heat utilization system and an operation method, The system is used for external heating or refrigeration after being heated by injecting circulating water through high-temperature steam extraction, and the residual heat is also recycled by the air heater. The system can effectively recycle the heat of circulating water, greatly improve the economy of the unit, have great energy-saving benefits, and effectively avoid the corrosion and blockage of the air preheater.
Preferably, a first control valve © is arranged between the steam extraction port of the steam turbine 1 and the steam side inlet of the gector 4.
Preferably, a second control valve 10 is arranged between the circulating water branch of the cold side outlet of the condenser 2 and the water side inlet of the gjector 4
Preferably, the cooling tower 3 is also included, and the cold aide of the condenser 2 ta connected with the cooling tower 3.
Preferably, the air preheater 7 is also included, and the cold side outlet of the air heater 6 is connected with the cold side iniet of the air preheater 7.
Preferably, the outlet of the hot side of the air preheater 7 15 provided with a low- temperature economizer &.
6 LU504285
Preferably, the hot air side outlet of the air preheater 7 15 connected to the wind side inlet of the boiler; The flue gas side inlet of the air preheater 7 is connected to the Îlue gas outlet of the hoter.
Preferably, the high-temperature water of the heat exchanger 5 is connected to a heat user.
Preferably, the cold side inlet of the air heater & 18 connected to a cold air source.
The invention relates to an operation method of a circulating water waste heat utilization system of an indirect air cooling unit, which comprises the following steps:
À stream of high-temperature steam ts pumped from the steam turbine 1 into the ejector 4, mixed with the hot water of the circulating cooling water branch at the cold-side outlet of the condenser 2 and heated in the ejector 4 The heated high-teruperature waler ts externally released in the heat exchanger 5, and the hot water released externally in the heat exchanger 5 heats the cold air in the heater 6 The air after heat absorption is heated by the air preheater 7 and enters the boiler, while the cold water after heat release is mixed with the circulating cooling water and enters the condenser 2.
The circulating water waste heat utilization system of indirect air cooling unit is used for external heating or refrigeration after being heated by injecting circulating water with hugh- temperature steam extraction, and the waste heat is also recycled by the air heater The system can effectively realize the recycling of circulating water heat, greatly improve the economy of the unit, have greater energy-saving benefits, and effectively avoid the corrosion and blockage of the air preheater. The system of the invention adopts the cooperation of the air heater and the low-temperature economizer, so that on the one hand, the inlet temperature of the air preheater can be increased, and the corrosion blockage of the air preheater can be effectively avoided; On the other hand, it can improve the combustion conditions of the boiler, hence improving the efficiency of the botler and reducing the heat consumption of the steam turbine, which has great energy-saving benefits,
The specific implementation is as follows. As shown in Figure 1, it is a schematic structural diagram of an indirect air cooling unit circulating water waste heat utilization system.
Hg main working principle 18 as follows: the system draws a stream of high-temperature steam from the steam turbine 1 into the ejector 4, and mixes it with the hot water of the circulating cooling water branch at the cold side outlet of the condenser 2 in the gjector 4 and beats it up.
The heated high-temperature water releases heat in the heat exchanger 5 as a heat source for external heating in winter or driving absorption refrigeration in summer: The hot water released in the heat exchanger § heals the cold air in the air heater 6, and the air after heat absorption
7 LU504285 enters the boiler after being heated by the air preheater 7, while the cold water after heat release enters the condenser 2 after being mixed with circulating cooling water, and the flue gas is heat recovered by the air preheater 7 and the low-temperature economizer §;
The system of the invention is provided with a first control valve © on the steam extraction pipeline for adjusting the steam extraction amount; À second control valve 10 is installed in the circulating water branch to adjust the injected circulating water flow, When the system is running in winter, the temperature of circniating water 18 low, 30 the first control valve 9 can be increased and the second control valve 10 can be decreased to ensure that the injected hot water can meet the demand of external heating load when releasing heat in the heat exchanger 5, When the system 1s running in summer, the high circulating water temperature will lead to the high back pressure of the steam turbine, which will reduce the circulating efficiency. By increasing the first control valve 9 and the second control valve 10, the circulating water flow of the condenser Z can be increased to reduce the circulating back pressure, and at the same time, the injected hot water will drive absorption refrigeration in the heat exchanger 5 to meet the cooling capacity demand in summer.
The above 1s only the preferred embodiment of the present invention, and does not limit the present invention in any form: Al ordinary technicians in the industry can smoothly implement the invention as shown in the attached drawings and described above, However, any equivalent changes made by those familiar with this field by using the technical contents disclosed above without departing from the scope of the technical scheme of the present invention are equivalent embodiments of the present invention: Meanwhile, any equivalent changes, modifications and evolutions made to the above embodiments according to the essential technology of the present invention still fall within the protection scope of the technical scheme of the present invention,
Claims (10)
- 8 LU504285 CLAIMS1. À circulating water waste heat utilization system of indirect air cooling unit, comprising a steam turbine {1}, a condenser {2}, an ejector {4}, a beat exchanger (5) and an air heater (6) the exhaust port of the steam turbine (1) is connected with the hot side inlet of the condenser {23, the steam extraction port of the steam turbine (1) is connected with the steam side inlet of the ejector {4}, the circulating water branch of the cold side outlet of the condenser {2} is connected with the water side inlet of the ejector (4), and the outlet of the ejector (4) 18 connected with the hot side inlet of the heat exchanger (5); the hot aide outlet of the air heater (6) is connected with the circulating water branch of the cold side inlet of the condenser {2}.2. The circulating water waste heat utilization system of indirect air cooling unit, as claimed in claim 1, a first control valve (9) is arranged between the steam extraction port of the steam turbine {1} and the steam side inlet of the ejector (4)3. The circulating water waste heat utilization system of indirect air cooling unit, as claimed in claim 1, à second control valve (10) 15 arranged between the circulating water branch of the cold side outlet of the condenser {2} and the water side inlet of the ejector {4}.4. The circulating water waste heat utilization system of indirect air cooling unit, as claimed in claim 1, it also comprises a cooling tower (3), and the cold side of the condenser (2) is connected with the cooling tower {3%5. The circulating water waste heat utilization system of indirect air cooling unit, as claimed in claim 1, it also comprises an air preheater {7}, and the cold side outlet of the air heater (5) is connected with the cold side inlet of the air preheater (74 & The circulating water waste heat utilization system of indirect air cooling unit, according to claro Ss characterized in that a low-temperature economizer (8) is arranged at the hot side outlet of the air preheater {7}.7. The circulatine water waste heat utilization system of indirect air cooling unit, according to claim 6, characterized in that the hot air side outlet of the air preheater {7} 15 connected to the wind side iniet of the boiler; the flue gas side inlet of the air preheater (7) is connected to the flue gas outlet of the boiler.8. The circulating water waste heat utilization system of indirect air cooling unit according to claim 1, characterized in that the high-temperature water of the heat exchanger (5) 15 connected to a heat user.9 LU504285©. The circulating water waste heat utilization system of indirect air cooling unit according to claim 1, characterized in that the cold side inlet of the air heater (6) 15 connected to a cold air SOUTCE.10. An operation method of circulating water waste heat utilization system of indirect air cooling unit, which is based on the indirect air cooling unit circulating water waste heat utilization system according to claun 1, characterized by comprising: a stream of high- temperature sieant is pumped from the steam turbine {1} into the ejector (4), and mixed with the hot water of the circulating cooling water branch at the cold side outlet of the condenser (2) in the ejector {4} and heated, and the heated high-temperature water is externally radiated in the beat exchanger (5), and the hot water radiated externally in the heat exchanger (5) heats cold air in the air heater {6}; the air after heat absorption enters the boiler after being heated by the air preheater (7), and the cold water after heat release enters the condenser (2) after being mixed with circulating cooling water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU504285A LU504285B1 (en) | 2023-05-22 | 2023-05-22 | Circular Water Waste Heat Utilization System for Indirect Air Cooling Unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU504285A LU504285B1 (en) | 2023-05-22 | 2023-05-22 | Circular Water Waste Heat Utilization System for Indirect Air Cooling Unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| LU504285B1 true LU504285B1 (en) | 2023-12-01 |
Family
ID=88925387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| LU504285A LU504285B1 (en) | 2023-05-22 | 2023-05-22 | Circular Water Waste Heat Utilization System for Indirect Air Cooling Unit |
Country Status (1)
| Country | Link |
|---|---|
| LU (1) | LU504285B1 (en) |
-
2023
- 2023-05-22 LU LU504285A patent/LU504285B1/en active IP Right Grant
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| Date | Code | Title | Description |
|---|---|---|---|
| FG | Patent granted |
Effective date: 20231201 |