CN213840883U - Chemical water replenishing system utilizing dead steam waste heat of direct air cooling unit - Google Patents
Chemical water replenishing system utilizing dead steam waste heat of direct air cooling unit Download PDFInfo
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- CN213840883U CN213840883U CN202022751829.9U CN202022751829U CN213840883U CN 213840883 U CN213840883 U CN 213840883U CN 202022751829 U CN202022751829 U CN 202022751829U CN 213840883 U CN213840883 U CN 213840883U
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/62—Absorption based systems
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Abstract
The utility model discloses an utilize chemical water charging system of direct air cooling unit exhaust steam waste heat, steam turbine low pressure jar exhaust steam gets into the air cooling island through the steam extraction device, and this system can retrieve the exhaust steam waste heat of direct air cooling unit, retrieves this part heat to thermodynamic system again, improves the economic nature of unit. The utility model discloses a chemistry water charging system has avoided the great problem of super-cooled rate that a large amount of chemistry moisturizing mends the condenser and brings, and more conventional water charging system of this system is more economical. The utility model discloses a chemistry water charging system adopts the mode of heating step by step, accords with the step utilization principle of energy more. Meanwhile, high-temperature chemical water supplement enters the thermodynamic system through the deaerator to achieve a good deaerating effect, so that the problem that condensed water-soluble oxygen exceeds the standard is avoided, and the corrosion of relevant equipment such as a steam turbine condensed water system and the like is effectively avoided.
Description
The technical field is as follows:
the utility model belongs to the steam turbine field, concretely relates to utilize chemical water charging system of direct air cooling unit exhaust steam waste heat.
Background art:
the water resource of China shows the situation that the number of east-docetaxel is small and the number of south-north is large, in order to relieve the problem of water resource shortage in the northwest region, most of generator sets in the northwest region adopt the direct air cooling technology at present, and the contradiction that a thermal power plant and other departments of national economy compete for water resources is relieved to a certain extent after the technology is popularized. In the power generation process of the direct air cooling unit, dead steam which does work is cooled in the air cooling island, a large amount of heat is taken away by the environment, and the part of heat is the maximum energy loss of the power generation unit. Along with the gradual strengthening of the national energy-saving and emission-reducing policy, in order to reduce the loss of the part of cold sources, more and more power plants start to supply heat to the outside, and the heat lost by the part of cold sources is recovered through a series of technical measures, so that the overall circulation efficiency of the unit is improved.
At present, industrial heat supply of a generator set generally adopts an unrecyclable mode, and when the heat supply amount is large, the corresponding chemical water supplement amount is correspondingly increased. In actual operation, two common chemical water replenishing modes are adopted, wherein one mode is to input chemical water replenishing into a condenser, and the other mode is to input chemical water replenishing into a deaerator. The moisturizing gets into thermodynamic system through the oxygen-eliminating device and can reach good deoxidization effect, but from the angle analysis of energy utilization, the lower demineralized water of temperature needs to increase the steam volume that gets into the oxygen-eliminating device after getting into the oxygen-eliminating device, and then the steam volume that can be used for doing work in the messenger steam turbine reduces, leads to the decline of steam turbine power capacity, consequently the lower moisturizing of temperature gets into thermodynamic system through the condenser and has better economic benefits, this also is the reason that most units at present directly mend the condenser with chemical moisturizing. But when the chemical water supply amount is great, the temperature of the condensate water is lower than the saturation temperature corresponding to the exhaust pressure, the supercooling degree is generated, and along with the increase of the chemical water supply amount, the supercooling degree is gradually increased, so that the economical efficiency of the unit is reduced to a certain extent.
If the chemical water replenishing of the unit can be heated by using the exhaust steam heat which does work, the temperature of the chemical water replenishing is increased, and the part of heat enters the thermodynamic system again through the deaerator, so that the economic benefit of the unit can be directly improved.
The invention content is as follows:
for solving the problem among the prior art, the utility model provides an utilize chemical water charging system of direct air cooling unit exhaust steam waste heat, this system utilization gets into the exhaust steam waste heat of air cooling island, adopts the mode heating microthermal chemical moisturizing of gradual heating, then directly mends the oxygen-eliminating device with the high temperature chemical moisturizing after the heating. The technical scheme of the utility model as follows:
a chemical water replenishing system utilizing waste steam waste heat of a direct air cooling unit is characterized in that waste steam of a low-pressure cylinder of a steam turbine enters an air cooling island through a steam exhaust device, and the chemical water replenishing system further comprises a hybrid condenser, a hydrophobic cooler, an absorption heat pump, a water replenishing heater and a deaerator;
a steam extraction port is arranged between the steam extraction device and the air cooling island, the exhaust steam of the low-pressure cylinder is divided into two paths through an exhaust steam pipeline from the steam extraction port, one path of the exhaust steam enters the hybrid condenser, the other path of the exhaust steam is used as a low-temperature heat source and is connected to the low-temperature heat source side of the absorption heat pump, and the exhaust steam enters the hybrid condenser after heat exchange;
after the chemical water supplement is mixed with the exhaust steam in the mixed condenser and heated, the chemical water supplement is heated by a water supplement pipeline sequentially through a water supplement pump, a water side of a drainage cooler, a water side of an absorption heat pump and a water side of a water supplement heater and then is supplemented into a deaerator;
the extraction steam of the steam turbine is divided into two paths through a driving steam pipeline, one path is connected to the driving steam side of the absorption heat pump, the other path is connected to the steam side of the water supplementing heater, the two paths of extraction steam and heat exchange are converged into one path which is used as a heat source and connected to the steam side of the hydrophobic cooler, and then the steam side outlet of the hydrophobic cooler is connected to the water side inlet of the absorption heat pump through the hydrophobic pump;
and chemical water supplement is mixed with the low-pressure cylinder exhaust steam in the mixed condenser to carry out primary heating, secondary heating is carried out through the water side of the drainage cooler, tertiary heating is carried out through the water side of the absorption heat pump, and the chemical water supplement is supplemented into the deaerator after quaternary heating is carried out through the water side of the water supplement heater.
Preferably, the turbine extraction is a fifth stage extraction of the turbine.
Preferably, the air cooling island is provided with a plurality of groups.
Preferably, the steam exhaust device is connected with the air cooling island through an isolation valve.
Preferably, the hydrophobic cooler is a surface heat exchanger.
Preferably, the chemical make-up water is mixed with the exhaust steam in a spraying mode in the hybrid condenser.
Preferably, the absorption heat pump is a lithium bromide absorption heat pump.
Preferably, the water replenishing heater is a surface heater.
Preferably, the deaerator is a thermal deaerator.
Preferably, the water replenishing pump outlet has a water replenishing pressure higher than the deaerator pressure.
The utility model discloses compare and have following beneficial effect in prior art:
the utility model discloses an utilize chemical water charging system of direct air cooling unit exhaust steam waste heat can retrieve the exhaust steam waste heat of direct air cooling unit, retrieves this part heat to thermodynamic system again, improves the economic nature of unit.
The utility model discloses a chemistry water charging system has avoided the great problem of super-cooled rate that a large amount of chemistry moisturizing mends the condenser and brings, and more conventional water charging system of this system is more economical.
The utility model discloses a chemistry water charging system adopts the mode of heating step by step, accords with the step utilization principle of energy more. Meanwhile, high-temperature chemical water supplement enters the thermodynamic system through the deaerator to achieve a good deaerating effect, so that the problem that condensed water-soluble oxygen exceeds the standard is avoided, and the corrosion of relevant equipment such as a steam turbine condensed water system and the like is effectively avoided.
Description of the drawings:
FIG. 1 is a schematic diagram of the system of the present invention;
wherein, 1-high and medium pressure cylinder; 2-low pressure cylinder; 3, a generator; 4-a steam exhaust device; 5-air cooling island; 6-a dead steam pipeline; 7-driving the steam pipeline; 8-a mixed condenser; 9-an absorption heat pump; 10-a water replenishing heater; 11-a deaerator; 12-a water replenishing pump; 13-steam drain line; 14-a hydrophobic cooler; 15-a hydrophobic pump; 16-water supplement pipeline.
The specific implementation mode is as follows:
the first embodiment is as follows:
the chemical water replenishing system utilizing the exhaust steam waste heat of the direct air cooling unit in the embodiment is shown in fig. 1, and the unit comprises a high-medium pressure cylinder 1, a low-pressure cylinder 2, a generator 3, a steam exhaust device 4 and four groups of air cooling islands 5; the steam turbine low-pressure cylinder exhaust steam enters the air cooling island 5 through the steam exhaust device 4 and the isolation valve, the chemical water replenishing system of the embodiment heats low-temperature chemical water replenishing by using partial exhaust steam waste heat entering the air cooling island 5 in a gradual heating mode, and then directly replenishes the high-temperature chemical water replenishing into the deaerator 11, wherein the chemical water replenishing system comprises a hybrid condenser 8, a hydrophobic cooler 14, an absorption heat pump 9, a water replenishing heater 10, the deaerator 11,
A steam extraction port is arranged between the steam exhaust device 4 and the air cooling island 5, partial exhaust steam of the low-pressure cylinder is divided into two paths by a steam extraction port through an exhaust steam pipeline 6 before entering the air cooling island 5, one path of the exhaust steam enters the hybrid condenser 8, the other path of the exhaust steam is used as a low-temperature heat source and is connected to the low-temperature heat source side of the absorption heat pump 9, and heat is extracted after heat exchange to be condensed into water to enter the hybrid condenser 8; in this embodiment, the chemical water supply is mixed with the exhaust steam in a spraying manner in the hybrid condenser 8. Because the outlet condensate water temperature of the hybrid condenser 8 has no end difference, the chemical water can be heated to the saturated water temperature corresponding to the exhaust steam pressure, and the heating temperature is higher than that of a surface condenser.
After the chemical water supplement is mixed with the exhaust steam in the mixed condenser 8 and heated, the chemical water supplement is heated by a water supplement pipeline sequentially through a water supplement pump, a water side of a drainage cooler, a water side of an absorption heat pump and a water side of a water supplement heater and then is supplemented into a deaerator 11;
the extracted steam of the steam turbine is divided into two paths through a driving steam pipeline 7, one path is used as driving steam to be connected to the driving steam side of the absorption heat pump, the other path is used as a high-temperature heat source to be connected with the steam side of a water supplementing heater, the two paths of extracted steam are respectively subjected to heat exchange through an absorption heat pump 9 and a water supplementing heater 10 and then converged into one path which is used as a heat source to be connected with the steam side of a drainage cooler through a steam drainage pipeline 13, and then the steam side outlet of the drainage cooler is connected to the water side inlet of the absorption heat pump through a drainage pump 15;
chemical water supplement is fully mixed with introduced exhaust steam after being sprayed in the mixed condenser 8, latent heat of vaporization is generated when the exhaust steam is condensed, the chemical water supplement is mixed with the exhaust steam of the low-pressure cylinder to be heated for the first stage, the mixture is pumped into the water side of the hydrophobic cooler through the water supplement pump 12, high-temperature hydrophobic water is further cooled after entering the hydrophobic cooler 14, and meanwhile, part of hydrophobic heat is absorbed.
And (4) carrying out secondary heating by chemically supplementing water on the water side of the hydrophobic cooler and carrying out heat exchange with extracted steam of a steam turbine on the steam side of the hydrophobic cooler.
The extracted steam of the steam turbine is connected to the water inlet of the absorption heat pump together with the water outlet of the water side of the hydrophobic cooler through the hydrophobic pump 15 and enters the water side of the absorption heat pump for third-stage heating.
The chemical moisturizing temperature through first, second and third level heating still is less than the condensate temperature who gets into oxygen-eliminating device 11, carries out the fourth grade heating through moisturizing heater 10 this moment, further heats chemical moisturizing for get into oxygen-eliminating device 11 after its temperature is unanimous with the condensate temperature who gets into oxygen-eliminating device 11.
Example two:
the further design of this embodiment lies in: in this embodiment, the steam extraction of the steam turbine is the steam extraction of the fifth section of the steam turbine. The utility model discloses a chemistry moisturizing system will chemistry moisturizing final heating to the temperature the same with the condensate water that gets into the oxygen-eliminating device, just so can not increase the steam volume that gets into the oxygen-eliminating device. The steam quality that gets into the deaerator is taken out the steam quality of steam than the five sections and is high, consequently adopts the fifth section to take out steam and carries out the fourth grade heating and for the chemical moisturizing direct input deaerator with the third level heating, heats chemical moisturizing more economical through the steam volume that increases the entering deaerator.
Example three:
the further design of this embodiment lies in: in this embodiment, the drain cooler is a surface heat exchanger, the absorption heat pump is a lithium bromide absorption heat pump, the water replenishing heater is a surface heater, the deaerator is a thermal deaerator, and the water replenishing pressure at the outlet of the water replenishing pump is higher than the deaerator pressure.
Claims (10)
1. The utility model provides an utilize chemical water charging system of direct air cooling unit exhaust steam waste heat, steam turbine low-pressure jar exhaust steam gets into the air cooling island through steam extraction device which characterized in that: the system comprises a hybrid condenser, a drainage cooler, an absorption heat pump, a water replenishing heater and a deaerator;
a steam extraction port is arranged between the steam extraction device and the air cooling island, the exhaust steam of the low-pressure cylinder is divided into two paths through an exhaust steam pipeline from the steam extraction port, one path of the exhaust steam enters the hybrid condenser, the other path of the exhaust steam is used as a low-temperature heat source and is connected to the low-temperature heat source side of the absorption heat pump, and the exhaust steam enters the hybrid condenser after heat exchange;
after the chemical water supplement is mixed with the exhaust steam in the mixed condenser and heated, the chemical water supplement is heated by a water supplement pipeline sequentially through a water supplement pump, a water side of a drainage cooler, a water side of an absorption heat pump and a water side of a water supplement heater and then is supplemented into a deaerator;
the extraction steam of the steam turbine is divided into two paths through a driving steam pipeline, one path is connected to the driving steam side of the absorption heat pump, the other path is connected to the steam side of the water supplementing heater, the two paths of extraction steam and heat exchange are converged into one path which is used as a heat source and connected to the steam side of the hydrophobic cooler, and then the steam side outlet of the hydrophobic cooler is connected to the water side inlet of the absorption heat pump through the hydrophobic pump;
and chemical water supplement is mixed with the low-pressure cylinder exhaust steam in the mixed condenser to carry out primary heating, secondary heating is carried out through the water side of the drainage cooler, tertiary heating is carried out through the water side of the absorption heat pump, and the chemical water supplement is supplemented into the deaerator after quaternary heating is carried out through the water side of the water supplement heater.
2. The chemical water replenishing system utilizing the exhaust steam waste heat of the direct air cooling unit according to claim 1, is characterized in that: and the steam extraction of the steam turbine is the steam extraction of the fifth section of the steam turbine.
3. The chemical water replenishing system utilizing the exhaust steam waste heat of the direct air cooling unit according to claim 1, is characterized in that: the air cooling island is provided with a plurality of groups.
4. The chemical water replenishing system utilizing the exhaust steam waste heat of the direct air cooling unit according to claim 1, is characterized in that: the steam exhaust device is connected with the air cooling island through an isolation valve.
5. The chemical water replenishing system utilizing the exhaust steam waste heat of the direct air cooling unit according to claim 1, is characterized in that: the hydrophobic cooler is a surface heat exchanger.
6. The chemical water replenishing system utilizing the waste steam afterheat of the direct air cooling unit according to any one of claims 1 to 5, characterized in that: and the chemical water supplement is mixed with the exhaust steam in a spraying mode in the mixed condenser.
7. The chemical water replenishing system utilizing the exhaust steam waste heat of the direct air cooling unit according to claim 1, is characterized in that: the absorption heat pump is a lithium bromide absorption heat pump.
8. The chemical water replenishing system utilizing the exhaust steam waste heat of the direct air cooling unit according to claim 1, is characterized in that: the water replenishing heater is a surface heater.
9. The chemical water replenishing system utilizing the exhaust steam waste heat of the direct air cooling unit according to claim 1, is characterized in that: the deaerator is a thermal deaerator.
10. The chemical water replenishing system utilizing the exhaust steam waste heat of the direct air cooling unit according to claim 1, is characterized in that: the water replenishing pressure of the outlet of the water replenishing pump is higher than the pressure of the deaerator.
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| CN202022751829.9U CN213840883U (en) | 2020-11-25 | 2020-11-25 | Chemical water replenishing system utilizing dead steam waste heat of direct air cooling unit |
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| CN202022751829.9U CN213840883U (en) | 2020-11-25 | 2020-11-25 | Chemical water replenishing system utilizing dead steam waste heat of direct air cooling unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114234663A (en) * | 2021-12-01 | 2022-03-25 | 东方电气集团东方汽轮机有限公司 | Industrial water replenishing and deoxidizing system and method for steam turbine |
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2020
- 2020-11-25 CN CN202022751829.9U patent/CN213840883U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114234663A (en) * | 2021-12-01 | 2022-03-25 | 东方电气集团东方汽轮机有限公司 | Industrial water replenishing and deoxidizing system and method for steam turbine |
| CN114234663B (en) * | 2021-12-01 | 2023-10-27 | 东方电气集团东方汽轮机有限公司 | Water supplementing and deoxidizing system and method for steam turbine industry |
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