CN114484413A - System and method for heating water - Google Patents
System and method for heating water Download PDFInfo
- Publication number
- CN114484413A CN114484413A CN202210044739.7A CN202210044739A CN114484413A CN 114484413 A CN114484413 A CN 114484413A CN 202210044739 A CN202210044739 A CN 202210044739A CN 114484413 A CN114484413 A CN 114484413A
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- steam
- heater
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- outlet
- valve group
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000008236 heating water Substances 0.000 title claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 238000010438 heat treatment Methods 0.000 claims abstract description 25
- 238000000605 extraction Methods 0.000 claims abstract description 19
- 230000001105 regulatory effect Effects 0.000 claims description 11
- 239000003245 coal Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims 2
- 238000001816 cooling Methods 0.000 abstract description 4
- 238000010977 unit operation Methods 0.000 abstract description 2
- 230000002349 favourable effect Effects 0.000 abstract 1
- 230000008901 benefit Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
Images
Classifications
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- 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
- F22D1/003—Feed-water heater systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/38—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating the engines being of turbine type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G1/00—Steam superheating characterised by heating method
- F22G1/005—Steam superheating characterised by heating method the heat being supplied by steam
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C15/00—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21D—NUCLEAR POWER PLANT
- G21D1/00—Details of nuclear power plant
- G21D1/006—Details of nuclear power plant primary side of steam generators
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Plasma & Fusion (AREA)
- High Energy & Nuclear Physics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention discloses a feedwater heating system and a feedwater heating method. The method provides a steam source for the unit water supply heating when the unit extraction steam is unavailable, can heat the unit water supply to the required temperature, and is favorable for the safe operation of the unit. When the steam turbine is tripped and the steam extraction of the steam turbine is lost, the system is put into use, the temperature of the inlet of the evaporator cannot fluctuate violently, and the safety of unit operation is improved. After the steam turbine and the reactor are tripped, the system can heat the feed water at the inlet of the evaporator to the temperature close to the temperature of the inlet of the evaporator, the feed water is supplied to the evaporator, the unit can be started again without long-time cooling, the quick start of the unit in a hot state is facilitated, the usability of the unit is improved, and the economy of the unit is improved.
Description
Technical Field
The invention belongs to the technical field of electric power, and particularly relates to a system and a method for heating water.
Background
At present, a steam source of a high-pressure heater of a thermal power generating unit generally comes from a steam turbine to extract steam, the steam turbine cannot extract steam before a unit is not connected to a grid, the unit is heated by only depending on a deaerator, the outlet water supply temperature of the deaerator is limited to be increased, when the unit is started in a thermal state, the water supply temperature cannot meet the requirement of the water supply temperature of a boiler (evaporator), the boiler (evaporator) is forced to be subjected to thermal shock by water supply, a long time is needed for waiting for the boiler (evaporator) to be cooled down, and the availability of the unit is reduced.
When the steam turbine is shut down and does not stop, the steam extraction is completely lost after the steam turbine is shut down, the steam sources of the high-pressure heater, the low-pressure heater and the deaerator are completely lost, the water supply temperature at the inlet of the evaporator is sharply reduced, and the safety of the evaporator is influenced;
after the steam turbine and the reactor are tripped, the water supply temperature at the inlet of the evaporator is difficult to increase to a temperature close to the water supply pipe plate at the inlet of the evaporator, the unit needs to be cooled for a long time (the cooling time is more than 170 hours) until the water supply temperature at the inlet of the evaporator is close to the temperature of the water supply pipe plate at the inlet of the evaporator, the water can be supplied to the evaporator again, the unit can be started, the availability of the unit is reduced, and the benefit of the unit is influenced.
Disclosure of Invention
The invention aims to solve the problems of heating of a water supply system and provides a system and a method for heating water supply.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
a feedwater heating system comprises a steam source, a superheater, a first valve group, a steam extraction pipeline of a steam turbine, a second valve group, a heater and a drain pipe; wherein,
the outlet of the steam source is connected with the inlet of the superheater, the outlet of the superheater is connected with the inlet of the first valve group, the outlet of the steam extraction pipeline of the steam turbine is connected with the inlet of the second valve group, the outlet of the first valve group and the outlet of the second valve group are mixed to form a branch which is connected with the first inlet of the heater, and the first outlet of the heater is connected with the inlet of the drain pipe.
In a further development of the invention, the first valve group comprises a non-return valve and a regulating valve.
In a further development of the invention, the second valve group comprises a non-return valve and a regulating valve.
The invention is further improved in that the heater is a shell and tube heat exchanger with water on the tube side and steam for heating the water on the shell side.
The invention is further improved in that the superheater is a surface heater, and the heating heat of the superheater comes from electric current, gas or coal.
The invention is further improved in that the steam source is on-line steam supply or local starting steam.
The invention is further improved in that when the temperature of the steam supplied by the on-line steam supply or the steam started by the on-line steam supply can not meet the temperature requirement of the steam source heated by the heater, the steam is heated by the superheater to meet the requirement.
The invention is further improved in that the device also comprises a heater inlet water supply pipeline and a heater outlet pipeline; the outlet of the water supply pipeline at the inlet of the heater is connected with the second inlet of the heater, and the second outlet of the heater is connected with the inlet of the outlet pipeline of the heater.
The method for heating the feedwater is characterized in that the startup process of the unit of the feedwater heating system comprises the following steps:
before the unit is not connected to the grid, the steam source provides steam, the steam is heated to the required temperature in the superheater and enters the shell side of the heater through the first valve group;
the feed water entering the heater from the feed water pipeline at the inlet of the heater is absorbed in the heat collector and then enters the outlet pipeline of the heater;
the steam entering the shell side of the heater forms condensed water after absorbing heat and enters the drain pipe;
after the unit is connected to the power grid, along with the increase of the steam pressure in the steam extraction pipeline of the steam turbine, the regulating valve in the first valve group is gradually closed, the regulating valve in the second valve group is opened, the steam on the shell side of the heater is gradually switched into the steam in the steam extraction pipeline of the steam turbine from the steam of a steam source, and the stable water supply temperature is noticed in the switching process.
Compared with the prior art, the invention has the following advantages:
the system and the method for heating water provided by the invention have the following obvious advantages compared with the system commonly used at present:
when the unit extraction steam is unavailable, a steam source is provided for unit water supply heating, the unit water supply can be heated to the required temperature, and the safe operation of the unit is facilitated.
When the steam turbine is tripped and the steam extraction of the steam turbine is lost, the system is put into use, the temperature of the inlet of the evaporator cannot fluctuate violently, and the safety of unit operation is improved.
After the steam turbine and the reactor are tripped, the system can heat the feed water at the inlet of the evaporator to the temperature close to the temperature of the inlet of the evaporator, the feed water is supplied to the evaporator, the unit can be started again without long-time cooling, the quick start of the unit in a hot state is facilitated, the usability of the unit is improved, and the economy of the unit is improved.
Drawings
Fig. 1 is a block diagram of a system for heating water according to the present invention.
Description of reference numerals:
1. the system comprises a steam source, 2, a superheater, 3, a first valve group, 4, a heater, 5, a drain pipe, 6, a heater inlet water supply pipeline, 7, a heater outlet pipeline, 8, a steam turbine steam extraction pipeline, 9 and a second valve group.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1, the feedwater heating system provided by the present invention includes a steam source 1, a superheater 2, a first valve group 3, a steam turbine extraction pipeline 8, a second valve group 9, a heater 4, a steam trap 5, a heater inlet feedwater pipeline 6, and a heater outlet pipeline 7.
The outlet of the steam source 1 is connected with the inlet of the superheater 2, the outlet of the superheater 2 is connected with the inlet of the first valve group 3, the outlet of the steam extraction pipeline 8 of the steam turbine is connected with the inlet of the second valve group 9, the outlet of the first valve group 3 and the outlet of the second valve group 9 are mixed to form a flow which is connected with the first inlet of the heater 4, and the first outlet of the heater 4 is connected with the inlet of the drain pipe 5. The outlet of the heater inlet feed water pipe 6 is connected with the second inlet of the heater 4, and the second outlet of the heater 4 is connected with the inlet of the heater outlet pipe 7.
Wherein, the first valve group 3 and the second valve group 9 both comprise a check valve and a regulating valve.
The heater 4 is a shell-and-tube heat exchanger, water is arranged on the tube side, and steam for heating water is arranged on the shell side.
The superheater 2 is a surface heater, and the heating heat of the superheater 2 comes from current, gas or coal.
The steam source 1 is on-machine steam supply or local starting steam. When the temperature of the steam supplied by the machine or the steam started by the machine cannot meet the temperature requirement of the steam source heated by the heater 4, the steam is heated by the superheater 2 to meet the requirement.
The invention provides a method for heating water, wherein the starting process of a unit comprises the following steps:
before the unit is not connected to the grid, steam is provided by a steam source 1, is heated to a required temperature in a superheater 2, and enters the shell side of a heater 4 through a first valve group 3;
the feed water entering the heater 4 from the heater inlet feed water pipe 6 is absorbed in the heat exchanger 4 and then enters the heater outlet pipe 7;
the steam entering the shell side of the heater 4 forms condensed water after absorbing heat and enters the drain pipe 5;
after the unit is connected to the power grid, along with the rising of the steam pressure in the steam extraction pipeline 8 of the steam turbine, the regulating valve in the first valve group 3 is gradually closed, the regulating valve in the second valve group 9 is opened, the steam on the shell side of the heater 4 is gradually switched into the steam in the steam extraction pipeline 8 of the steam turbine from the steam of the steam source 1, and the stable water supply temperature is noticed in the switching process.
Examples
The feedwater heating of the high-temperature gas cooled reactor demonstration engineering evaporator can be realized only by a deaerator before the unit is not connected to the grid, and the feedwater temperature can be only heated to 105 ℃ in the starting stage of the unit. The high pressure reactor can be put into operation only when the power of the reactor reaches about 45 percent, before the high pressure reactor is put into operation, the temperature of the primary side inlet of the evaporator is increased to 750 ℃ from 105 ℃, the temperature of the outlet is increased to 250 ℃ from 105 ℃, the temperature of the secondary side outlet steam of the evaporator is increased to 560 ℃ from 105 ℃, the temperature of the secondary side inlet of the evaporator is always about 105 ℃, and the temperature difference among the parts of the evaporator is large, so that the safe operation of the evaporator is not facilitated. After the method is adopted, the temperature of the secondary side inlet of the evaporator can be correspondingly increased along with the increase of the temperature of the primary side, the temperature difference of the operation of the evaporator is reduced, and the safe operation of a unit is facilitated.
When the steam turbine is tripped and the steam extraction of the steam turbine is lost, the system is put into use, the inlet temperature of the evaporator can be heated to be closer to the temperature of the unit during operation, the water supply temperature cannot fluctuate violently, and the safety of the unit during operation is improved.
After the steam turbine and the reactor are tripped, the system can heat the feed water at the inlet of the evaporator to the temperature close to the temperature of the inlet of the evaporator, supply water to the evaporator, and establish the circulation of the two loops within 15 hours, so that the unit can be restarted without long-time cooling, the quick starting of the unit in a hot state is facilitated, the usability of the unit is improved, and the economy of the unit is improved.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (9)
1. A feedwater heating system is characterized by comprising a steam source (1), a superheater (2), a first valve group (3), a steam turbine extraction pipeline (8), a second valve group (9), a heater (4) and a drain pipe (5); wherein,
the outlet of the steam source (1) is connected with the inlet of the superheater (2), the outlet of the superheater (2) is connected with the inlet of the first valve group (3), the outlet of a steam extraction pipeline (8) of the steam turbine is connected with the inlet of the second valve group (9), the outlet of the first valve group (3) and the outlet of the second valve group (9) are mixed to form a mixture, the mixture is connected with the first inlet of the heater (4), and the first outlet of the heater (4) is connected with the inlet of the drain pipe (5).
2. A system for heating up feedwater according to claim 1, characterized in that the first valve group (3) comprises a non-return valve and a regulating valve.
3. A system for heating water as claimed in claim 1, characterized in that the second set of valves (9) comprises a non-return valve and a regulating valve.
4. A system for heating feedwater as claimed in claim 1 wherein the heater (4) is a shell and tube heat exchanger with water on the tube side and steam for heating the water on the shell side.
5. A feedwater heating system according to claim 1, wherein the superheater (2) is a surface heater, and the heat of heating of the superheater (2) is from electric current, gas or coal.
6. A feedwater heating system according to claim 1 wherein the steam source (1) is on-line steam or local start-up steam.
7. A feedwater heating system according to claim 6 wherein, when the temperature of the on-line steam supply or the on-line steam start-up cannot meet the temperature requirement of the steam source heated by the heater (4), the superheater (2) is used for heating to meet the requirement.
8. A feedwater heating system according to claim 1, further comprising a heater inlet feedwater conduit (6) and a heater outlet conduit (7); wherein, the outlet of the heater inlet water supply pipeline (6) is connected with the second inlet of the heater (4), and the second outlet of the heater (4) is connected with the inlet of the heater outlet pipeline (7).
9. A method for heating feedwater, characterized in that the method is based on a feedwater heating system according to claim 8, and the set start-up procedure comprises the following steps:
before the unit is not connected to the grid, steam is provided by a steam source (1), is heated to a required temperature in a superheater (2), and enters the shell side of a heater (4) through a first valve group (3);
the feed water entering the heater (4) from the heater inlet feed water pipeline (6) is absorbed in the heater (4) and then enters the heater outlet pipeline (7);
the steam entering the shell side of the heater (4) is absorbed with heat to form condensed water, and then enters the drain pipe (5);
after the unit is connected to the power grid, along with the increase of steam pressure in a steam turbine extraction pipeline (8), a regulating valve in a first valve group (3) is gradually closed, a regulating valve in a second valve group (9) is opened, steam on the shell side of a heater (4) is gradually switched into steam in the steam turbine extraction pipeline (8) from steam of a steam source (1), and the switching process is aware of stable water supply temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210044739.7A CN114484413A (en) | 2022-01-14 | 2022-01-14 | System and method for heating water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210044739.7A CN114484413A (en) | 2022-01-14 | 2022-01-14 | System and method for heating water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114484413A true CN114484413A (en) | 2022-05-13 |
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ID=81511828
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210044739.7A Pending CN114484413A (en) | 2022-01-14 | 2022-01-14 | System and method for heating water |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110131003A (en) * | 2019-06-10 | 2019-08-16 | 西安热工研究院有限公司 | System and method for starting and stopping secondary loop of high-temperature gas cooled reactor nuclear power unit |
| CN112524596A (en) * | 2020-11-18 | 2021-03-19 | 神华（福州）罗源湾港电有限公司 | Auxiliary heating system of steam extraction regenerative system of steam turbine and control method |
| CN112944321A (en) * | 2021-04-02 | 2021-06-11 | 华北电力科学研究院有限责任公司 | System for increasing boiler feed water temperature during blow tube and method of use thereof |
| US20210285335A1 (en) * | 2020-03-16 | 2021-09-16 | General Electric Company | System and method to improve boiler and steam turbine start-up times |
| CN216521613U (en) * | 2022-01-14 | 2022-05-13 | 西安热工研究院有限公司 | Water supply heating system |
-
2022
- 2022-01-14 CN CN202210044739.7A patent/CN114484413A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110131003A (en) * | 2019-06-10 | 2019-08-16 | 西安热工研究院有限公司 | System and method for starting and stopping secondary loop of high-temperature gas cooled reactor nuclear power unit |
| US20210285335A1 (en) * | 2020-03-16 | 2021-09-16 | General Electric Company | System and method to improve boiler and steam turbine start-up times |
| CN112524596A (en) * | 2020-11-18 | 2021-03-19 | 神华（福州）罗源湾港电有限公司 | Auxiliary heating system of steam extraction regenerative system of steam turbine and control method |
| CN112944321A (en) * | 2021-04-02 | 2021-06-11 | 华北电力科学研究院有限责任公司 | System for increasing boiler feed water temperature during blow tube and method of use thereof |
| CN216521613U (en) * | 2022-01-14 | 2022-05-13 | 西安热工研究院有限公司 | Water supply heating system |
Non-Patent Citations (1)
| Title |
|---|
| 汪卫东: "《热力发电厂》", 31 July 2012, 中国电力出版社, pages: 142 * |
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