CN210601576U - Medium-pressure water supply heating structure - Google Patents
Medium-pressure water supply heating structure Download PDFInfo
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- CN210601576U CN210601576U CN201921713436.XU CN201921713436U CN210601576U CN 210601576 U CN210601576 U CN 210601576U CN 201921713436 U CN201921713436 U CN 201921713436U CN 210601576 U CN210601576 U CN 210601576U
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Abstract
The utility model relates to a middling pressure feedwater heating structure, the steam inlet of oxygen-eliminating device connects four sections steam extraction pipeline, the feedwater exit linkage water supply line of oxygen-eliminating device, and the middling pressure section of water supply line sets up steam cooler, four sections steam extraction pipeline earlier through this steam cooler again with oxygen-eliminating device entry linkage, the utility model discloses a steam cooler's that increases mode in water supply system cools off four sections steam extraction earlier, and leading-in oxygen-eliminating device again can reduce by a wide margin in the oxygen-eliminating device because four sections steam extraction temperature is far above the acting capacity loss in the oxygen-eliminating device that saturated condensate temperature degree formed, can also heat the feedwater that gets into follow-up high pressure heater to higher temperature, finally improves the generating efficiency of turboset.
Description
Technical Field
The utility model relates to a boiler feedwater heating structure is applicable to thermal generator set, can improve unit generating efficiency.
Background
In order to improve the generating efficiency of the thermal generator set, the temperature of feed water entering a boiler is improved by adopting a regenerative system. A primary deaerating heater is usually arranged in a regenerative system, so that the temperature of feed water is increased on one hand, and the primary deaerating heater is used for thermally deaerating condensed water entering the deaerator on the other hand.
A conventional deaerator is a hybrid heater, and steam for heating the deaerator comes from a four-stage extraction. Taking certain parameters of an ultra-supercritical 2 x 660MW unit as an example, the full-load operation pressure of the four-stage steam extraction is 1.152MPa, the temperature is 367 ℃, the pressure of the deaerator corresponds to the saturation temperature of about 185 ℃, and the condensed water is heated to the saturation temperature mainly by the latent heat of vaporization of the steam, so that the deaerator has large work capacity loss.
SUMMERY OF THE UTILITY MODEL
The technical problem solved by the utility model is to provide a medium-pressure water supply heating structure.
The technical means adopted by the utility model are as follows.
The utility model provides a medium-pressure feedwater heating structure, the steam inlet of oxygen-eliminating device connects four sections steam extraction pipelines, the water supply exit linkage water supply pipeline of oxygen-eliminating device, the medium-pressure section of water supply pipeline sets up steam cooler, four sections steam extraction pipelines earlier carry out the heat exchange through this steam cooler then with oxygen-eliminating device steam inlet connects.
Furthermore, a feed water pump preposition pump is arranged on a feed water pipeline in front of the steam cooler.
Furthermore, a high-pressure steam-driven water feeding pump is arranged on a water feeding pipeline behind the steam cooler.
The beneficial effects of the utility model are as follows.
1. The utility model discloses can reduce the three-section and take out the vapour under the condition that does not change final feedwater temperature, increase and effectively utilize the four sections to take out the vapour to the increasing heat efficiency reduces the coal consumption.
2. The water side of the steam cooler of the utility model adopts medium-pressure water supply, the design pressure is smaller, and the equipment cost is low.
3. When the unit of the utility model is in partial load, the temperature of the steam from the steam turbine is almost unchanged, so that the unit still has better coal saving effect.
4. The utility model discloses can reduce by a wide margin because the acting capacity loss in the deaerator that the four sections steam extraction temperature is far higher than the saturated condensate temperature and forms in the deaerator, can also heat the feedwater that gets into follow-up high pressure feed water heater to higher temperature, finally improve the generating efficiency of turboset.
5. The utility model discloses improve original thermodynamic system, reduced the exergy losses of feedwater backheating system to reduced the steam turbine heat consumption, improved the unit thermal efficiency, reduced the electricity generation coal consumption of unit. The water side of the adopted equipment is the corresponding pressure of medium-pressure water supply, and the steam side is the four-section steam extraction pressure, so that the equipment investment is less.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The utility model relates to a middling pressure feedwater heating structure. The water supply system comprises a deaerator 2, and the steam side of the deaerator 2 is provided with four-section steam extraction to supply steam, so that a steam inlet of the deaerator 2 is connected with a four-section steam extraction pipeline 1. The water side of the deaerator 2 is connected with a low-pressure water supply pipeline 33, the outlet of the low-pressure water supply pipeline 33 is connected with the inlet of a medium-pressure water supply pipeline 34 through a water supply pre-pump 31, the outlet of the medium-pressure water supply pipeline 34 is connected with the inlet of a high-pressure water supply pipeline 35 through a high-pressure steam-driven water supply pump 32, and the high-pressure water supply pipeline 35 sequentially passes through No. 3, No. 2 and No. 1 high-pressure heaters and then goes to the boiler economizer to supply water.
A steam cooler 4 is provided in the medium-pressure feed line 34. Above-mentioned four sections steam extraction pipeline 1 is earlier through this steam cooler 4, again with 2 entry linkage of deaerator, and four sections steam extraction releases the heat in this steam cooler 4 and is cooled off near saturation temperature promptly, and later the leading-in deaerator 2 of four sections steam extraction after will cooling mixes, and consequently, the four sections steam extraction of suitable temperature can effectively reduce the acting capacity loss of four sections steam extraction simultaneously in deaerator 2 heating condensate water.
The heat of the superheated part released by the four-section extraction steam in the steam cooler 4 is transferred to the medium-pressure feed water in the feed water pipeline 3, so that the feed water temperature finally entering the No. 3 high-pressure heater can be increased by about 5 ℃, and the extraction steam of the superior heater is saved. Because the working capacity of the three-stage steam extraction is different from that of the four-stage steam extraction, the output of the unit is increased finally, and the heat efficiency of the unit is improved.
Claims (3)
1. The utility model provides a middling pressure feedwater heating structure, its characterized in that, the steam inlet of oxygen-eliminating device (2) connects four sections steam extraction pipeline (1), the feedwater exit linkage water supply pipeline of oxygen-eliminating device (2), the middling pressure section of water supply pipeline sets up steam cooler (4), four sections steam extraction pipeline (1) earlier carry out the heat exchange through this steam cooler again with oxygen-eliminating device (2) steam inlet is connected.
2. Medium pressure feedwater heating structure as in claim 1, characterized by a feedwater pump pre-pump (31) placed on the feedwater line before the steam cooler (4).
3. Medium pressure feedwater heating structure according to claim 1, characterized in that a high pressure steam feed pump (32) is provided on the feed line after the steam cooler (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921713436.XU CN210601576U (en) | 2019-10-14 | 2019-10-14 | Medium-pressure water supply heating structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921713436.XU CN210601576U (en) | 2019-10-14 | 2019-10-14 | Medium-pressure water supply heating structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210601576U true CN210601576U (en) | 2020-05-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921713436.XU Active CN210601576U (en) | 2019-10-14 | 2019-10-14 | Medium-pressure water supply heating structure |
Country Status (1)
| Country | Link |
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| CN (1) | CN210601576U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112479550A (en) * | 2020-11-09 | 2021-03-12 | 西安热工研究院有限公司 | Deep energy-saving system for coupling sludge steam drying of coal-fired power plant |
-
2019
- 2019-10-14 CN CN201921713436.XU patent/CN210601576U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112479550A (en) * | 2020-11-09 | 2021-03-12 | 西安热工研究院有限公司 | Deep energy-saving system for coupling sludge steam drying of coal-fired power plant |
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