CN118030221A - Thermoelectric system - Google Patents
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- CN118030221A CN118030221A CN202410129369.6A CN202410129369A CN118030221A CN 118030221 A CN118030221 A CN 118030221A CN 202410129369 A CN202410129369 A CN 202410129369A CN 118030221 A CN118030221 A CN 118030221A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 151
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- 230000005540 biological transmission Effects 0.000 claims description 13
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- 230000001172 regenerating effect Effects 0.000 abstract description 10
- 238000010438 heat treatment Methods 0.000 description 5
- 238000011144 upstream manufacturing Methods 0.000 description 4
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- 150000001450 anions Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a thermoelectric system which is provided with a heat exchanger for exchanging heat with a steam exhaust device, and can utilize steam to heat desalted water, so that the heat of steam in the steam exhaust device is fully utilized, the heat loss is reduced, and the heat efficiency of the thermoelectric system is improved. The thermoelectric system provided by the invention is also provided with the second low-pressure heater which is connected with the first low-pressure heater in parallel, the heat of the regenerative air suction in the steam turbine is fully utilized to further heat and raise the temperature of desalted water passing through the second low-pressure heater by utilizing the regenerative air suction of the steam turbine, the steam amount discharged into the steam exhaust device is reduced, the loss of a cold source is further reduced, and the thermal efficiency of the thermoelectric system is further improved.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a thermoelectric system.
Background
The thermoelectric system can supply power to users through the steam turbine generator unit, and can supply heat to users directly or by utilizing a temperature and pressure reducer, steam extraction of a steam turbine, steam exhaust and the like.
The thermoelectric system comprises a boiler, a steam turbine (steam turbine generator unit), a steam exhaust device, an air cooling island, a high-pressure heat exchanger, a low-pressure heat exchanger and the like. A part of high-pressure steam discharged from the boiler is output through a steam main pipe, the steam pressure in the steam main pipe is about 9.5MPa, and the other part of the high-pressure steam is output to the steam turbine to do work. The hot steam in the steam turbine is output through one section of steam extraction (about 4.2 MP), the second section of steam extraction exchanges heat with one high-pressure heat exchanger, the third section of steam extraction (about 1.1 MP) outputs and exchanges heat with one high-pressure heat exchanger, and the fourth section of steam extraction and the fifth section of steam extraction exchange heat with the low-pressure heat exchanger respectively. The steam exhausted by the steam turbine enters a steam exhaust device, the steam exhaust device outputs steam to an air cooling island for cooling and condensing, and the generated condensed water returns to the steam exhaust device and then enters a deaerator through heat exchange of a low-pressure heat exchanger. To maintain the steam-water system balance, demineralized water needs to be replenished into the deaerator. The water in the deaerator returns to the boiler through the high-pressure heat exchanger. The process of extracting some of the working steam from some intermediate stages of the turbine to heat the water returned to the boiler is called a feedwater recovery process, and the thermodynamic cycle corresponding to this is called a feedwater recovery cycle. After the regenerative heating of the feed water is adopted, on one hand, a part of steam is extracted from the middle part of the steam turbine, the feed water is heated, the feed water temperature of the boiler is increased, the heat absorption capacity of the feed water in the boiler is reduced, the heat of the steam is fully utilized, and the heat efficiency of the whole cycle is improved.
In the prior art, desalted water is directly supplemented into the deaerator, the temperature of the desalted water is low, heat is required to be absorbed, the steam heat of the steam turbine is not fully utilized, a large amount of steam is directly discharged for cooling and condensing, heat loss is caused, and the thermal efficiency of the thermoelectric system is still required to be improved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a thermoelectric system, which can heat desalted water by utilizing steam through arranging a heat exchanger for exchanging heat with a steam exhaust device, fully utilizes the heat of the steam and improves the heat efficiency of the thermoelectric system.
The technical scheme of the invention provides a thermoelectric system, which comprises a boiler, a steam turbine, a steam exhaust device, an air cooling island, a deaerator, at least one high-pressure heater, at least one first low-pressure heater, a heat exchanger, a first water pump and a desalted water supply pipeline;
A steam supply pipeline is connected between the boiler and the steam turbine;
The steam exhaust device is provided with a steam chamber and a water tank below the steam chamber, the steam chamber is communicated with the tail end of the steam turbine, a steam exhaust pipeline is connected between the steam chamber and an air cooling island, and a water return pipeline is connected between the air cooling island and the water tank;
a water supply pipeline is connected between the water tank and the boiler, and the first low-pressure heater, the deaerator, the first water pump and the high-pressure heater are sequentially connected in series on the water supply pipeline along the water flow direction;
A first steam extraction pipeline is connected between the steam turbine and the high-pressure heater, and a second steam extraction pipeline is connected between the steam turbine and the first low-pressure heater;
The heat exchanger is connected with the steam exhaust device and exchanges heat with the steam chamber, the demineralized water supply pipeline is connected with a liquid inlet of the heat exchanger, a demineralized water transmission pipeline is connected between a liquid outlet of the heat exchanger and the deaerator, and a first valve is arranged on the demineralized water transmission pipeline.
In one optional technical scheme, at least one second low-pressure heater is connected in series on the desalted water transmission pipeline, the second low-pressure heater is connected with the first low-pressure heater in parallel, and the second low-pressure heater is connected with the steam turbine through one second steam extraction pipeline.
In one optional technical scheme, two first low-pressure heaters are connected in series on the water supply pipeline between the water tank and the deaerator;
And two second low-pressure heaters are connected in series on the desalted water transmission pipeline, and each second low-pressure heater is arranged in parallel with one first low-pressure heater.
In one optional technical scheme, one of the two second steam extraction pipelines is connected with four sections of steam extraction ports of the steam turbine, and the other second steam extraction pipeline is connected with five sections of steam extraction ports of the steam turbine.
In one optional technical scheme, a communication pipeline is connected between the desalted water supply pipeline and the deaerator, and a second valve is arranged on the communication pipeline.
In one optional technical scheme, a second water pump is connected in series on the water supply pipeline, and the second water pump is positioned between the water tank and the first low-pressure heater.
In one optional technical scheme, two high-pressure heaters are connected in series on the water supply pipeline between the boiler and the deaerator, and each high-pressure heater is connected with the steam turbine through one first steam extraction pipeline.
In one optional technical scheme, one of the two first steam extraction pipelines is connected with the two-section steam extraction port of the steam turbine, and the other first steam extraction pipeline is connected with the three-section steam extraction port of the steam turbine.
In one optional technical scheme, the first steam extraction pipeline connected with the three-section steam extraction port is further connected with the deaerator through a branch pipeline.
In one optional technical scheme, the heat exchanger is a shell-and-tube heat exchanger, and the shell-and-tube heat exchanger is installed in the steam chamber.
By adopting the technical scheme, the method has the following beneficial effects:
The thermoelectric system provided by the invention is provided with the heat exchanger for exchanging heat with the steam exhaust device, so that the desalted water can be heated by utilizing the steam, the heat of the steam in the steam exhaust device is fully utilized, the heat loss is reduced, and the heat efficiency of the thermoelectric system is improved. The thermoelectric system provided by the invention is also provided with the second low-pressure heater which is connected with the first low-pressure heater in parallel, the heat of the regenerative air suction in the steam turbine is fully utilized to further heat and raise the temperature of desalted water passing through the second low-pressure heater by utilizing the regenerative air suction in the steam turbine, the steam amount discharged into a steam exhaust device is reduced, the loss of a cold source is further reduced, and the thermal efficiency of the thermoelectric system is further improved.
Drawings
The present disclosure will become more readily understood with reference to the accompanying drawings. It should be understood that: the drawings are for illustrative purposes only and are not intended to limit the scope of the present invention. In the figure:
Fig. 1 is a schematic diagram of a thermoelectric system according to an embodiment of the present invention.
Detailed Description
Specific embodiments of the present invention will be further described below with reference to the accompanying drawings. Wherein like parts are designated by like reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "inner" and "outer" refer to directions toward or away from, respectively, the geometric center of a particular component.
As shown in fig. 1, a thermoelectric system according to an embodiment of the present invention includes a boiler 1, a steam turbine 2, a steam exhaust device 3, an air cooling island 4, a deaerator 5, at least one high-pressure heater 6, at least one first low-pressure heater 7, a heat exchanger 8, a first water pump 10, and a desalted water supply line 12.
A steam supply pipeline 13 is connected between the boiler 1 and the steam turbine 2.
The steam exhaust device 3 is provided with a steam chamber 31 and a water tank 32 arranged below the steam chamber 31, the steam chamber 31 is communicated with the tail end of the steam turbine 2, a steam exhaust pipeline 14 is connected between the steam chamber 31 and the air cooling island 4, and a water return pipeline 15 is connected between the air cooling island 4 and the water tank 32.
A water supply pipeline 16 is connected between the water tank 32 and the boiler 1, and the first low-pressure heater 7, the deaerator 5, the first water pump 10 and the high-pressure heater 6 are sequentially connected in series on the water supply pipeline 16 along the water flow direction.
A first steam extraction pipeline 17 is connected between the steam turbine 2 and the high-pressure heater 6, and a second steam extraction pipeline 18 is connected between the steam turbine 2 and the first low-pressure heater 7.
The heat exchanger 8 is connected with the steam exhaust device 3 and exchanges heat with the steam chamber 31, the desalted water supply pipeline 12 is connected with a liquid inlet of the heat exchanger 8, a desalted water transmission pipeline 19 is connected between a liquid outlet of the heat exchanger 8 and the deaerator 5, and a first valve 20 is arranged on the desalted water transmission pipeline 19.
The thermoelectric system provided by the invention can be used in a thermal power plant. The thermoelectric system comprises a boiler 1, a steam turbine 2, a steam exhaust device 3, an air cooling island 4, a deaerator 5, a high-pressure heater 6, a first low-pressure heater 7, a heat exchanger 8, a first water pump 10, a desalted water supply pipeline 12 and the like.
The boiler 1 is used for heating and generating high-pressure steam, the steam pressure is about 9.5MPa, one part of the steam is pumped out to a user end through a main pipe, and the other part of the steam is transmitted to the steam turbine 2 through a steam supply pipeline 13. The turbine 2 (turbo generator set) uses the high pressure steam to do work to generate electricity. Part of the steam with the pressure of about 4.2MPa in the steam turbine 2 is extracted to a user end through a section of steam extraction port 2-1. Part of steam in the steam turbine 2 can be extracted through the second-stage steam extraction port 2-2 and the third-stage steam extraction port 2-3 to extract heating backwater. About 1.1MPa of steam extracted from the three-section steam extraction port 2-3 can also be conveyed to the user side. The steam delivered to the user side can be used for heating, and the user side can be a heating unit of the factory building. The steam exhaust device 3 is arranged at the tail end of the steam turbine 2, the inside of the steam exhaust device comprises a steam chamber 31 and a water tank 32, and the water tank 32 is arranged below the steam chamber 31. The steam discharged by the steam turbine 2 enters a steam chamber 31, then enters an air cooling island 4 through a steam discharge pipeline 14 to be cooled and condensed into water, and the condensed water enters a water tank 32 through a water return pipeline 15 and then returns to the boiler 1 through a water supply pipeline 16.
The first low-pressure heater 7, the deaerator 5, the first water pump 10 and the high-pressure heater 6 are sequentially connected in series on the water supply pipe 16, the first low-pressure heater 7 is upstream of the deaerator 5 in the water flow direction along the water supply pipe 16, the deaerator 5 is upstream of the first water pump 10, and the first water pump 10 is upstream of the high-pressure heater 6.
The first low-pressure heater 7 is connected with the steam turbine 2 through a second steam extraction pipeline 18, the second steam extraction pipeline 18 can be connected to the four-section steam extraction port 2-4 and the five-section steam extraction port 2-4 of the steam turbine 2, and the regenerative steam of the steam turbine can enter the first low-pressure heater 7 through the second steam extraction pipeline 18 so as to heat condensed water in the water supply pipeline 16.
The heated condensed water enters the deaerator 5, and the deaerator 5 is used for removing oxygen and other steam dissolved in the water supply, so that corrosion of boiler water supply pipes, economizers and other auxiliary equipment is prevented and reduced.
The first water pump 10 powers the water circulation. The water in the deaerator 5 flows to the high-pressure heater 6 via the first water pump 10. The high-pressure heater 6 is connected with the steam turbine 2 through a first steam extraction pipeline 17, the first steam extraction pipeline 17 can be connected to the two-section steam extraction port 2-2 and the three-section steam extraction port 2-3 of the steam turbine 2, and the regenerative steam of the steam turbine can enter the high-pressure heater 6 through the first steam extraction pipeline 17 so as to heat condensed water in the water supply pipeline 16 and further improve the water supply temperature.
The water flowing out of the high pressure heater 6 is returned to the boiler 1.
The number of the high-pressure heater 6 and the first low-pressure heater 7 may be arranged selectively as needed. In general, the heater downstream of the first water pump 10 is referred to as a high-pressure heater, and the heater upstream of the first water pump 10 is referred to as a low-pressure heater.
To maintain the steam-water system balance, the desalted water is supplied through the desalted water supply line 12. The desalted water is the finished water obtained by removing suspended matters, colloid, inorganic cations, anions and other impurities in water by various water treatment processes.
In order to fully utilize the steam heat in the steam chamber 31 to heat the desalted water, the heat exchanger 8 is connected with the steam exhaust device 3, and the heat exchanger 8 is specifically connected with the steam chamber 31 to exchange heat with the steam chamber 31. The heat exchanger 8 is preferably mounted in a steam chamber 31. The demineralized water supply pipeline 12 is connected with the liquid inlet of the heat exchanger 8, the liquid outlet of the heat exchanger 8 is connected with a demineralized water transmission pipeline 19, the demineralized water transmission pipeline 19 is connected to the deaerator 5, a first valve 20 is arranged on the demineralized water transmission pipeline 19, the first valve 20 is used for controlling the switch of the demineralized water transmission pipeline 19, and an electric or pneumatic regulating valve can be selected. The first valve 20 may employ a valve combination.
So arranged, the steam in the steam chamber 31 exchanges heat with the heat exchanger 8 before being discharged through the steam discharge pipeline 14 to heat the desalted water flowing through the heat exchanger 8, and the heated desalted water enters the deaerator 5 to supplement the water supply of the boiler 1.
Therefore, the thermoelectric system provided by the invention is provided with the heat exchanger 8 for exchanging heat with the steam exhaust device 3, so that the desalted water can be heated by utilizing steam, the heat of the steam in the steam exhaust device 3 is fully utilized, the heat loss is reduced, and the heat efficiency of the thermoelectric system is improved.
In one embodiment, as shown in fig. 1, at least one second low-pressure heater 9 is connected in series to the desalted water conveying pipeline 19, the second low-pressure heater 9 is connected in parallel to the first low-pressure heater 7, and the second low-pressure heater 9 is connected to the steam turbine 2 through a second steam extraction pipeline 18.
In this embodiment, the thermoelectric system is further provided with a second low-pressure heater 9 connected in parallel with the first low-pressure heater 7, and the second low-pressure heater 9 is connected in series to the desalted water conveying line 19. The regenerated steam extracted through the second steam extraction pipeline 18 can enter the second low-pressure heater 9 to further heat the desalted water flowing through, the heat of the regenerated steam in the steam turbine 2 is fully utilized, the steam amount discharged into the steam exhaust device 3 is reduced, the steam amount required to be subjected to condensation treatment through the air cooling island 4 is further reduced, the loss of a cold source is further reduced, and the thermal efficiency of the thermoelectric system is further improved.
In one embodiment, as shown in fig. 1, two first low-pressure heaters 7 are connected in series to the water supply pipe 16 between the water tank 32 and the deaerator 5. Two second low-pressure heaters 9 are connected in series on the desalted water conveying pipeline 19, and each second low-pressure heater 9 is arranged in parallel with one first low-pressure heater 7.
In this embodiment, the two first low-pressure heaters 7 can utilize more steam turbine regenerative steam to heat condensed water in the water supply pipeline 16, so as to raise the water supply temperature. The two second low-pressure heaters 9 can heat the desalted water in the desalted water conveying pipeline 19 by using more steam turbine regenerative steam, so as to raise the temperature of the desalted water.
In one embodiment, as shown in fig. 1, one of the two second steam extraction pipelines 18 is connected to the four steam extraction ports 2-4 of the steam turbine 2, and the other second steam extraction pipeline 18 is connected to the five steam extraction ports 2-5 of the steam turbine 2. That is, one set of the first low-pressure heater 7 and the second low-pressure heater 9 belongs to four-stage extraction, and the other set of the first low-pressure heater 7 and the second low-pressure heater 9 belongs to five-stage extraction to match with four-stage and five-stage extraction ports of the steam turbine 2.
In one embodiment, as shown in fig. 1, a communication pipeline 21 is connected between the desalted water supply pipeline 12 and the deaerator 5, and a second valve 22 is arranged on the communication pipeline 21. When the demineralized water needs to be rapidly replenished, the second valve 22 can be opened, and the demineralized water in the demineralized water supply pipeline 12 can enter the deaerator 5 through the communicating pipeline 21, so that the flow path of the demineralized water is shortened. Valves may be provided at both ends of the heat exchanger 8 as needed to control the waterway circulation of the demineralized water.
The second valve 22 is used for controlling the opening and closing of the communication pipeline 21, and a regulating valve is selected. One end of the communication pipe 21 may also be connected to the first valve 20.
In one embodiment, as shown in fig. 1, a second water pump 11 is connected in series to the water supply pipe 16, and the second water pump 11 is located between the water tank 32 and the first low-pressure heater 7 to power the condensed water in the water tank 32 to enter the water supply pipe 6.
In one embodiment, as shown in fig. 1, two high-pressure heaters 6 are connected in series on a water supply pipeline 16 between the boiler 1 and the deaerator 5, and each high-pressure heater 6 is connected with the steam turbine 2 through a first steam extraction pipeline 17.
In this embodiment, the two high-pressure heaters 6 can heat the condensed water in the water supply pipeline 16 by using more steam turbine regenerative steam, so as to raise the water supply temperature.
In one embodiment, as shown in fig. 1, one of the two first steam extraction pipelines 17 is connected with the two-stage steam extraction port 2-2 of the steam turbine 2, and the other first steam extraction pipeline 17 is connected with the three-stage steam extraction port 2-3 of the steam turbine 2. That is, one high-pressure heater 6 belongs to two-stage steam extraction, and the other high-pressure heater 6 belongs to three-stage steam extraction to be matched with two-stage steam extraction ports and three-stage steam extraction ports of the steam turbine 2.
In one embodiment, as shown in fig. 1, the first steam extraction pipeline 17 connected with the three-stage steam extraction port is further connected with the deaerator 5 through a branch pipeline 23, and the deaerator 5 is heated by using hot steam of the three-stage steam extraction.
In one embodiment, as shown in fig. 1, the heat exchanger 8 is a shell-and-tube heat exchanger, which is mounted in a steam chamber 31. The shell-and-tube heat exchanger is also called a shell-and-tube heat exchanger, and has high temperature and high pressure resistance and high heat exchange efficiency.
The above technical schemes can be combined according to the need to achieve the best technical effect.
The foregoing is only illustrative of the principles and preferred embodiments of the present invention. It should be noted that several other variants are possible to those skilled in the art on the basis of the principle of the invention and should also be considered as the scope of protection of the present invention.
Claims (10)
1. The thermoelectric system is characterized by comprising a boiler, a steam turbine, a steam exhaust device, an air cooling island, a deaerator, at least one high-pressure heater, at least one first low-pressure heater, a heat exchanger, a first water pump and a desalted water supply pipeline;
A steam supply pipeline is connected between the boiler and the steam turbine;
The steam exhaust device is provided with a steam chamber and a water tank below the steam chamber, the steam chamber is communicated with the tail end of the steam turbine, a steam exhaust pipeline is connected between the steam chamber and an air cooling island, and a water return pipeline is connected between the air cooling island and the water tank;
a water supply pipeline is connected between the water tank and the boiler, and the first low-pressure heater, the deaerator, the first water pump and the high-pressure heater are sequentially connected in series on the water supply pipeline along the water flow direction;
A first steam extraction pipeline is connected between the steam turbine and the high-pressure heater, and a second steam extraction pipeline is connected between the steam turbine and the first low-pressure heater;
The heat exchanger is connected with the steam exhaust device and exchanges heat with the steam chamber, the demineralized water supply pipeline is connected with a liquid inlet of the heat exchanger, a demineralized water transmission pipeline is connected between a liquid outlet of the heat exchanger and the deaerator, and a first valve is arranged on the demineralized water transmission pipeline.
2. The thermoelectric system of claim 1 wherein at least one second low pressure heater is connected in series with the demineralized water transport line, the second low pressure heater being connected in parallel with the first low pressure heater, the second low pressure heater being connected to the steam turbine by one of the second extraction lines.
3. The thermoelectric system of claim 2 wherein two of said first low pressure heaters are connected in series on said water feed line between said water trough and said deaerator;
And two second low-pressure heaters are connected in series on the desalted water transmission pipeline, and each second low-pressure heater is arranged in parallel with one first low-pressure heater.
4. The thermoelectric system of claim 3 wherein one of said second extraction lines is connected to four extraction ports of said turbine and the other of said second extraction lines is connected to five extraction ports of said turbine.
5. The thermoelectric system of claim 1 wherein a communication conduit is connected between the demineralized water supply line and the deaerator, the communication conduit having a second valve disposed thereon.
6. The thermoelectric system of claim 1 wherein a second water pump is connected in series with the water feed line, the second water pump being between the water tank and the first low pressure heater.
7. The thermoelectric system of claim 1 wherein two of said high pressure heaters are connected in series to said feed water conduit between said boiler and said deaerator, each of said high pressure heaters being connected to said steam turbine by one of said first extraction lines.
8. The thermoelectric system of claim 7 wherein one of said two first extraction lines is connected to a two-stage extraction port of said turbine and the other of said first extraction lines is connected to a three-stage extraction port of said turbine.
9. The thermoelectric system of claim 8 wherein the first extraction line connected to the three-stage extraction port is further connected to the deaerator by a branching line.
10. The thermoelectric system of claim 1 wherein the heat exchanger is a shell-and-tube heat exchanger, the shell-and-tube heat exchanger being mounted in the vapor chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410129369.6A CN118030221A (en) | 2024-01-30 | 2024-01-30 | Thermoelectric system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410129369.6A CN118030221A (en) | 2024-01-30 | 2024-01-30 | Thermoelectric system |
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| CN118030221A true CN118030221A (en) | 2024-05-14 |
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| CN202410129369.6A Pending CN118030221A (en) | 2024-01-30 | 2024-01-30 | Thermoelectric system |
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