CN115199355A - Condensed water energy utilization device of high-pressure heater of thermal power plant - Google Patents
Condensed water energy utilization device of high-pressure heater of thermal power plant Download PDFInfo
- Publication number
- CN115199355A CN115199355A CN202110397621.8A CN202110397621A CN115199355A CN 115199355 A CN115199355 A CN 115199355A CN 202110397621 A CN202110397621 A CN 202110397621A CN 115199355 A CN115199355 A CN 115199355A
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- China
- Prior art keywords
- pressure heater
- condensed water
- inlet
- tee joint
- outlet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- 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
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
- F01K3/18—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters
- F01K3/26—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters with heating by steam
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C11/00—Combinations of two or more machines or engines, each being of rotary-piston or oscillating-piston type
- F01C11/002—Combinations of two or more machines or engines, each being of rotary-piston or oscillating-piston type of similar working principle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C13/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
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- 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
- F01K13/00—General layout or general methods of operation of complete plants
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- 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
- F01K7/02—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 multiple-expansion type
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a condensed water energy utilization device of a high-pressure heater of a thermal power plant, which is characterized by comprising a high-pressure heater, a screw expander, a valve, a generator, a deaerator and a tee joint, wherein a condensed water outlet of the high-pressure heater of a thermal power generating unit is connected with an inlet of the tee joint, one outlet of the tee joint is connected with an inlet of the screw expander, an outlet of the screw expander is connected with one inlet of a condensed water inlet tee joint of a next-stage high-pressure heater or deaerator, the screw expander is connected with the generator, valves are arranged at an inlet and an outlet of the screw expander, the other outlet of the condensed water outlet tee joint of the high-pressure heater is connected with the other inlet of the condensed water inlet tee joint of the next-stage high-pressure heater or deaerator, and a bypass valve is arranged between the two inlets.
Description
Technical Field
The invention relates to a condensed water energy utilization device of a high-pressure heater of a thermal power plant.
Background
In large thermal power plants, in order to improve the system efficiency, a multi-stage regenerative method is generally adopted, i.e., part of steam is extracted at a plurality of positions in a steam turbine, and the heat of the steam is released to a boiler for water supply through a plurality of heat exchangers, so that the temperature of the water supply is gradually increased, and finally the cycle efficiency of the thermal power plant is improved. After the extracted steam is heated in the high-pressure heater to feed water, the extracted steam is condensed into water, and the water enters the next-stage high-pressure heater in a pressure-reducing self-flowing mode and finally flows into the boiler feed water. Specifically, the condensed water of the No. 1 high-pressure heater of the regenerative system flows into the No. 2 high-pressure heater, the condensed water of the No. 2 high-pressure heater flows into the No. 3 high-pressure heater, and the condensed water of the No. 3 high-pressure heater flows into the deaerator. Similarly, the condensed water of the low-pressure heater follows the same rule and finally flows into the hot well of the turbine condenser. The condensed water in the hot water well is pressurized by a condensed water pump, sequentially flows through No. 8, no. 7, no. 6 and No. 5 low-pressure heaters, then enters a deaerator, and sequentially flows through No. 3, no. 2 and No. 1 high-pressure heaters after being pressurized by a water feeding pump, and then enters a boiler economizer.
Although the system can fully utilize the heat of the extracted steam, the pressure energy of the extracted steam cannot be fully utilized, for example, a thermal power generating set of 600MW, the pressure of the 1-stage extracted steam is generally 5-7 MPa, namely the pressure of the condensed water of the No. 1 high-pressure heater is also 5-7 MPa, but the pressure of the deaerator is only 0.7-0.9 MPa, so that the pressure energy of the condensed water cannot be fully utilized in the conventional stage-by-stage gravity flow mode, and the pressure energy is wasted.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a device capable of utilizing the pressure energy of the condensed water of a high-pressure heater.
The technical scheme adopted by the invention is as follows: the energy recovery method of the high-pressure heater of the thermal power plant comprises the high-pressure heater, a deaerator, a screw expander, a generator, a valve and a tee joint, wherein a condensed water outlet of the high-pressure heater of the thermal power generator unit is connected with an inlet of the tee joint, an outlet of the tee joint is connected with an inlet of the tee joint arranged at a condensed water inlet of the deaerator or and a condensed water outlet of the first-level low-pressure heater, the screw expander is connected with the generator, valves are arranged between the two tee joints and the inlet and the outlet of the screw expander, the other outlet of the condensed water outlet of the high-pressure heater is connected with the other inlet of the condensed water inlet tee joint of the first-level low-pressure heater or the deaerator, and a bypass valve is arranged between the two.
The invention has simple structure and less investment and can improve the power supply efficiency of a power plant.
Drawings
FIG. 1 is a schematic diagram of the present invention.
Detailed Description
The present invention is described in further detail below with reference to the attached drawings.
The reference numerals are explained below:
1. 4, 7- high pressure heater 2, 5, 8-bypass adjusting valve
3. 6, 11, 15, 20, 26-tee joint 9-feed water pump
10- deaerator 12, 16, 17, 21, 22, 25-valve
13. 18, 23- generators 14, 19, 24-screw expander
In the embodiment shown in fig. 1, the condensed water outlets of the high-pressure heater 1, the high-pressure heater 4 and the high-pressure heater 7 are respectively connected with the inlets of the tee joint 26, the tee joint 20 and the tee joint 15, and the condensed water inlets of the high-pressure heater 4, the high-pressure heater 7 and the deaerator 10 are respectively connected with the outlets of the tee joint 3, the tee joint 6 and the tee joint 11. One outlet of the tee joint 26 is connected with one inlet of the tee joint 3, and the bypass adjusting valve 2 is arranged between the two; the other outlet of the tee joint 26 is connected with the inlet of the screw expander 24, and a valve 25 is arranged between the two; the outlet of the screw expander 24 is connected to the other inlet of the tee 3, and a valve 22 is installed therebetween. One outlet of the tee joint 20 is connected with one inlet of the tee joint 6, and a bypass adjusting valve 5 is arranged between the two; the other outlet of the tee joint 20 is connected with the inlet of the screw expander 19, and a valve 21 is arranged between the two outlets; the outlet of the screw expander 19 is connected to the other inlet of the tee 6, and a valve 17 is installed therebetween. One outlet of the tee joint 15 is connected with one inlet of the tee joint 11, and a bypass adjusting valve 8 is arranged between the two; the other outlet of the tee joint 15 is connected with the inlet of the screw expander 14, and a valve 16 is arranged between the two outlets; the outlet of the screw expander 14 is connected to the other inlet of the tee 11, and a valve 12 is installed therebetween. The screw expanders 14, 19 and 24 are connected to the generators 13, 18 and 23, respectively.
In the normal power generation process of a thermal power plant, the bypass adjusting valve 2, the bypass adjusting valve 5 and the bypass adjusting valve 8 are closed, and other valves are in an open state, so that condensed water from the high-pressure heater 1 enters the screw expander 24 to be decompressed, expanded and do work and drive the generator 23 to generate power, and a water-vapor mixture discharged from the screw expander 24 enters the high-pressure heater 4; similarly, the condensed water from the high-pressure heater 4 drives the screw expander 19 to drive the generator 18 to generate electricity, and the condensed water from the high-pressure heater 7 drives the screw expander 14 to drive the generator 13 to generate electricity. In case of equipment failure or maintenance, such as the screw expander 24, the bypass valve 2 can be opened while the valves 25 and 22 at the inlet and outlet of the screw expander 24 are closed, so that the power plant can still operate as usual.
Since the number of the high-pressure heaters of the thermal power plant is not necessarily 3, the present invention is not limited to the above-described preferred embodiments, and any other various products can be obtained by anyone in light of the present invention. However, any changes in shape or structure, which are the same or similar to the technical solutions of the present invention, are within the protection scope.
Claims (1)
1. A condensed water energy utilization device of a high-pressure heater of a thermal power plant is characterized by comprising a high-pressure heater, a deaerator, a screw expander, a generator, a valve and a tee joint, wherein a condensed water outlet of the high-pressure heater of a thermal power generating unit is connected with an inlet of the tee joint, an outlet of the tee joint is connected with an inlet of the tee joint arranged at a condensed water inlet of the deaerator or a high-pressure heater with lower pressure, the screw expander is connected with the generator, the valve is arranged between the two tee joints and an inlet and an outlet of the screw expander, the other outlet of the condensed water outlet tee joint of the high-pressure heater is connected with the other inlet of the condensed water inlet tee joint of the deaerator or the high-pressure heater with lower pressure, and a bypass valve is arranged between the two inlet and the outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110397621.8A CN115199355A (en) | 2021-04-09 | 2021-04-09 | Condensed water energy utilization device of high-pressure heater of thermal power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110397621.8A CN115199355A (en) | 2021-04-09 | 2021-04-09 | Condensed water energy utilization device of high-pressure heater of thermal power plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115199355A true CN115199355A (en) | 2022-10-18 |
Family
ID=83571015
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110397621.8A Pending CN115199355A (en) | 2021-04-09 | 2021-04-09 | Condensed water energy utilization device of high-pressure heater of thermal power plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115199355A (en) |
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2021
- 2021-04-09 CN CN202110397621.8A patent/CN115199355A/en active Pending
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