CN204880080U - Waste heat of boiler flue gas recovery system - Google Patents
Waste heat of boiler flue gas recovery system Download PDFInfo
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- CN204880080U CN204880080U CN201520615453.5U CN201520615453U CN204880080U CN 204880080 U CN204880080 U CN 204880080U CN 201520615453 U CN201520615453 U CN 201520615453U CN 204880080 U CN204880080 U CN 204880080U
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Abstract
The utility model discloses a waste heat of boiler flue gas recovery system, including economizer, the pump body, first heat exchanger, second heat exchanger, heat supply network water system and condensate system, the economizer the heat transferring medium of first heat exchanger side and the pump body feeds through a formation circulation circuit in proper order, the economizer the heat transferring medium of second heat exchanger side and the pump body feeds through the 2nd circulation circuit of formation in proper order, the first water of first heat exchanger side with the condensate system intercommunication forms first heat transfer return circuit, the second water of second heat exchanger side with heat supply network water system intercommunication forms second heat transfer return circuit. The utility model discloses an independent heat transfer of heat supply network water and condensate water has prevented the quality of water interference effectively, guarantees that the host computer condensate water is not contaminated. Simultaneously, adopt the indirect heat transfer mode of heat transferring medium and the heat exchange of boiler flue gas for condensate water and heat supply network water not with economizer direct contact, reduced economizer resistance to compression requirement, can save former material producing cost.
Description
Technical field
The utility model relates to residual heat from boiler fume recovery technology field, refers in particular to a kind of residual heat from boiler fume recovery system.
Background technology
In boiler operatiopn, a most important loss is heat loss due to exhaust gas, reduces flue gas loss, and Appropriate application fume afterheat is particularly important for the economy of economize energy, raising power plant.More adopt low-level (stack-gas) economizer in residual heat from boiler fume removal process, namely utilize condensate water and/or hot net water to absorb fume afterheat as low-temperature receiver.When non-heating period and condensate water heat exchange, condensate water absorbs smoke exhaust heat in low-level (stack-gas) economizer, reduces exhaust gas temperature, self is heated, returns steam turbine low-pressure heater system again after raised temperature, replacing the effect of part low-pressure heater, is a part of thermodynamic system of steam tur.When Heating Period and hot net water heat exchange, hot net water flows through economizer and flue gas heat exchange, and the hot net water after heating externally exports for heating.
Current existing fume recovery system due to Heating Period different from the low-temperature receiver of non-heating period fume afterheat system, therefore, low-level (stack-gas) economizer water side system needs to switch according to the change of unit load character, due to condensate water and hot net water common pall between import and export shut-off valve in the process switched, thus there is the problem that identical pipeline different quality is used alternatingly, if misoperation when hot net water and condensate water switch, easy pollution condensate water water quality, and flushing in early stage needs to consume partial coagulation water or demineralized water, working medium has waste.Further, when with condensate water heat exchange, economizer needs to bear the compression of condensate water at least about 4Mpa, and thus its corrosion resistance, pouring are higher.
Utility model content
Based on this, the utility model is the defect overcoming prior art, provides a kind of residual heat from boiler fume recovery system, and it achieves the independent heat exchange of hot net water and condensate water, effectively prevent water quality interference, ensures that main frame condensate water is not contaminated.
Its technical scheme is as follows:
A kind of residual heat from boiler fume recovery system, comprise economizer, the pump housing, First Heat Exchanger, second heat exchanger, hot net water system and condensate system, described economizer, the heat transferring medium side of described First Heat Exchanger and the described pump housing are communicated with formation first closed circuit successively, described economizer, the heat transferring medium side of described second heat exchanger and the described pump housing are communicated with formation second closed circuit successively, first water side of described First Heat Exchanger is communicated with formation first heat-exchanging loop with described condensate system, second water side and the described hot net water system connectivity of described second heat exchanger form the second heat-exchanging loop.
Wherein in an embodiment, also comprise the first triple valve and the second triple valve, described first triple valve is provided with the first joint, the second joint, the 3rd joint, described first joint is communicated with the heat transferring medium side output of described economizer, described second joint is communicated with the heat transferring medium side input of described First Heat Exchanger, and described 3rd joint is communicated with the heat transferring medium side input of described second heat exchanger; Described second triple valve is provided with the 4th joint, the 5th joint and the 6th joint, described 4th joint is communicated with the heat transferring medium side input of described economizer, described 5th joint is communicated with the heat transferring medium side output of described First Heat Exchanger, and described 6th joint is communicated with the heat transferring medium side output of described second heat exchanger.
Wherein in an embodiment, the heat transferring medium side input of described economizer is also communicated with heat transferring medium feed system.
Wherein in an embodiment, also comprise low-pressure heater, the input of described low-pressure heater is communicated with by low-pressure heater water inlet pipe with the output of described condensate system, the output of described low-pressure heater is communicated with by low-pressure heater outlet pipe with the input of described condensate system, the input of the first water side of described First Heat Exchanger is communicated with by the first water inlet pipe with described low-pressure heater water inlet pipe, the output of the first water side of described First Heat Exchanger is communicated with by the first outlet pipe with described low-pressure heater outlet pipe, described first water inlet pipe is provided with the first water intaking valve, described first outlet pipe is provided with the first outlet valve.
Wherein in an embodiment, the input of the second water side of described second heat exchanger is communicated with by the second water inlet pipe with the output of described hot net water system, the output of the second water side of described second heat exchanger is communicated with by the second outlet pipe with the input of described hot net water system, described second water inlet pipe is provided with the second water intaking valve, described second outlet pipe is provided with the second outlet valve, shunt valve is provided with between described second water inlet pipe and described second outlet pipe, described shunt valve is provided with bypass valve, described shunt valve and described second water inlet pipe junction are provided with the first tie point, described shunt valve and described second outlet pipe junction are provided with the second tie point, described second water intaking valve is between described first tie point and described second heat exchanger, described second outlet valve is between described second tie point and described second heat exchanger.
Wherein in an embodiment, described first water inlet pipe is provided with water regulating valve.
Wherein in an embodiment, the heat transferring medium of described heat transferring medium side is demineralized water.
The beneficial effects of the utility model are:
This programme adopts First Heat Exchanger and the second heat exchanger to be connected in parallel on economizer two ends and forms two heat transferring medium closed circuits, First Heat Exchanger is provided with the first water side with heat transferring medium side heat exchange wherein, second heat exchanger is provided with the second water side with heat transferring medium side heat exchange wherein, thus form independently the first heat-exchanging loop and the second heat-exchanging loop, prevent the problem that identical pipeline different quality is used alternatingly, in the switching of Heating Period and non-heating period, only need cut off and be communicated with corresponding heat transferring medium closed circuit, main frame condensate water water quality can not be polluted, be conducive to reliability requirement high, fault rate requires that low construction safety carries out.Simultaneously, adopt heat transferring medium and boiler smoke heat exchange, afterwards heat transferring medium again with the indirect heat exchange mode of condensate water and hot net water heat exchange, condensate water is not directly contacted with economizer with hot net water, reduce the pouring of economizer, correspondingly can save raw material cost of manufacture.
The heat transferring medium side output of described economizer is communicated with by the first triple valve with the heat transferring medium side input of described second heat exchanger with described First Heat Exchanger, the heat transferring medium side input of described economizer is communicated with by the second triple valve with the heat transferring medium side output of described second heat exchanger with described First Heat Exchanger, when non-heating season saves, first triple valve and the second triple valve all switch to the heat transferring medium side being communicated with economizer and First Heat Exchanger, define the first closed circuit of heat-setting water; When heating season, the first triple valve and the second triple valve all switch to the heat transferring medium side being communicated with economizer and the second heat exchanger, define the second closed circuit of heating hot net water.First triple valve and the second triple valve achieve the independent heat exchange of condensate water and hot net water, condensate water are heated and hot net water heating easy switching.
Because heat transferring medium has certain loss in heat transfer process, thus the heat transferring medium side input of economizer is also communicated with heat transferring medium feed system, ensures that heat transferring medium closed circuit can have sufficient heat transferring medium to supply, keeping system stable operation.
The first water inlet pipe and the first outlet pipe is provided with between first water side of First Heat Exchanger and condensate system, first water inlet pipe and the first outlet pipe are respectively equipped with the first water intaking valve and the first outlet valve, because the first water inlet pipe is communicated with low-pressure heater water inlet pipe, first outlet pipe is communicated with low-pressure heater outlet pipe, thus First Heat Exchanger and low-pressure heater parallel communication, the condensate water of its heating can replace the use of part low-pressure heater, when needs carry out repair and maintenance to described residual heat from boiler fume recovery system, as long as close the first water intaking valve and the first outlet valve, the use of steam turbine machine condensate water main road can not be affected.
The second water inlet pipe and the second outlet pipe is provided with between second water side of the second heat exchanger and hot net water system, second water inlet pipe and the second outlet pipe are respectively equipped with the second water intaking valve and the second outlet valve, shunt valve is provided with between described second water inlet pipe and described second outlet pipe, described shunt valve is provided with bypass valve, when needs carry out repair and maintenance to described residual heat from boiler fume recovery system, directly can close the second water intaking valve and the second outlet valve and open bypass valve, second water inlet pipe is communicated with by shunt valve with the second outlet pipe afterwards, ensures that hot net water main road normally uses.
First water inlet pipe of First Heat Exchanger is the branch of low-pressure heater water inlet pipe, and the first water inlet pipe can arrange water regulating valve, in order to regulate the condensing water flow entering First Heat Exchanger, and then can indirectly regulate fume afterheat uptake.
The heat transferring medium of described heat transferring medium side is demineralized water, demineralized water has higher cleannes, meet system water quality requirement, the utility model only needs to bear the compression that demineralized water is about 0.6Mpa size simultaneously, decrease the pouring of described residual heat from boiler fume recovery system, the utility model can adopt tubing that corresponding pouring is lower as raw material, effectively reduces cost of manufacture.
Accompanying drawing explanation
Fig. 1 is the structural representation of the residual heat from boiler fume recovery system described in the utility model embodiment.
Description of reference numerals:
10, deduster, 20, desulfurization island, 30, heat transferring medium feed system, 100, economizer, 200, the pump housing, 300, First Heat Exchanger, 310, first water inlet pipe, 311, first water intaking valve, 312, water regulating valve, 320, first outlet pipe, 321, first outlet valve, 400, second heat exchanger, 410, second water inlet pipe, 411, second water intaking valve, 420, second outlet pipe, 421, second outlet valve, 430, shunt valve, 431, bypass valve, 500, hot net water system, 600, condensate system, 700, first triple valve, 710, first joint, 720, second joint, 730, 3rd joint, 800, second triple valve, 810, 4th joint, 820, 5th joint, 830, 6th joint, 900, low-pressure heater, 910, low-pressure heater water inlet pipe, 911, low-pressure heater water intaking valve, 920, low-pressure heater outlet pipe, 921, low-pressure heater outlet valve.
Detailed description of the invention
Below embodiment of the present utility model is described in detail:
As shown in Figure 1, a kind of residual heat from boiler fume recovery system, comprise and be located at economizer 100, the pump housing 200, First Heat Exchanger 300, second heat exchanger 400, the condensate system 600 of hot net water system 500 and steam turbine, after deduster 10 is located at by economizer 100, before desulfurization island 20, economizer 100, the heat transferring medium side of First Heat Exchanger 300 and the pump housing 200 are communicated with formation first closed circuit successively, economizer 100, the heat transferring medium side of the second heat exchanger 400 and the pump housing 200 are communicated with formation second closed circuit successively, first water side of First Heat Exchanger 300 is communicated with formation first heat-exchanging loop with condensate system 600, second water side of the second heat exchanger 400 is communicated with formation second heat-exchanging loop with hot net water system 500.By First Heat Exchanger 300 and the second heat exchanger 400 are connected in parallel on the first closed circuit and the second closed circuit that economizer 100 two ends form heat transferring medium respectively, in first water side of First Heat Exchanger 300 afterwards condensate water again with heat transferring medium heat exchange in heat transferring medium side wherein, reach the object of heat-setting water; In like manner, in the second water side of the second heat exchanger 400, hot net water and heat transferring medium heat exchange in heat transferring medium side wherein, reach the object of heating hot net water.The utility model first heat-exchanging loop and the second heat-exchanging loop are independent separately, prevent the problem that identical pipeline different quality is used alternatingly, in the switching of Heating Period and non-heating period, only need cut off and be communicated with corresponding heat transferring medium closed circuit, steam turbine condensate water water quality can not be polluted, be conducive to that reliability requirement is high, fault rate requires that low construction safety carries out.Simultaneously, adopt heat transferring medium and boiler smoke heat exchange, afterwards heat transferring medium more respectively with the indirect heat exchange mode of condensate water, hot net water heat exchange, condensate water, hot net water are not directly contacted with economizer 100, reduce the pouring of economizer 100, correspondingly can save raw material cost of manufacture.
The heat transferring medium of heat transferring medium side described in the utility model is preferably demineralized water, demineralized water has higher cleannes, meet system water quality requirement, the utility model only needs to bear the compression that demineralized water is about 0.6Mpa size simultaneously, decrease the pouring of described residual heat from boiler fume recovery system, the utility model can adopt tubing that corresponding pouring is lower as raw material, effectively reduces cost of manufacture.
The pump housing 200 is preferably closed cycle water pump, and for overcoming the resistance that heat transferring medium closed circuit and heat exchanger bring, and its lift is lower than the booster of traditional direct heat transfer system, saves power consumption.
The utility model also comprises the first triple valve 700 and the second triple valve 800, first triple valve 700 is provided with the first joint 710, second joint 720, the 3rd joint 730, first joint 710 is communicated with the heat transferring medium side output of economizer 100, second joint 720 is communicated with the heat transferring medium side input of First Heat Exchanger 300, and the 3rd joint 730 is communicated with the heat transferring medium side input of the second heat exchanger 400; Second triple valve 800 is provided with the 4th joint 810, the 5th joint 820 and the 6th joint 830,4th joint 810 is communicated with the heat transferring medium side input of economizer 100,5th joint 820 is communicated with the heat transferring medium side output of First Heat Exchanger 300, and the 6th joint 830 is communicated with the heat transferring medium side output of the second heat exchanger 400.When non-heating season saves, the first triple valve 700 and the second triple valve 800 all switch to and are communicated with economizer 100 and the heat transferring medium side of First Heat Exchanger 300, define the first closed circuit of heat-setting water; When heating season, the first triple valve 700 and the second triple valve 800 all switch to the heat transferring medium side being communicated with economizer 100 and the second heat exchanger 400, define the second closed circuit of heating hot net water.First triple valve 700 and the second triple valve 800 achieve the independent heating of condensate water and hot net water, condensate water are heated and hot net water heating easy switching.
Because heat transferring medium has certain loss in heat transfer process, thus the heat transferring medium side input of economizer 100 is also communicated with heat transferring medium feed system 30 and automatically supplies, and ensures that heat transferring medium closed circuit can stable operation.
The utility model also comprises low-pressure heater 900, the input of low-pressure heater 900 is communicated with by low-pressure heater water inlet pipe 910 with the output of condensate system 600, and the output of low-pressure heater 900 is communicated with by low-pressure heater outlet pipe 920 with the input of condensate system 600.The input of the first water side of First Heat Exchanger 300 is communicated with by the first water inlet pipe 310 with low-pressure heater water inlet pipe 910, for being introduced in First Heat Exchanger 300 by the condensate water of low-pressure heater water inlet pipe 910; The output of the first water side of First Heat Exchanger 300 is communicated with by the first outlet pipe 320 with low-pressure heater outlet pipe 920, for importing the condensate water after heating in the main condensate of low-pressure heater outlet pipe 920.First water inlet pipe 310 is provided with the first water intaking valve 311, first outlet pipe 320 is provided with the first outlet valve 321, low-pressure heater water inlet pipe 910 is provided with low-pressure heater water intaking valve 911, low-pressure heater outlet pipe 920 is provided with low-pressure heater outlet valve 921, under normal operating condition, above-mentioned valve is all in open mode, when needs carry out repair and maintenance to described residual heat from boiler fume recovery system, as long as close the first water intaking valve 311 and the first outlet valve 321, low-pressure heater 900 still can normal heating condensate water export supply, the use of steam turbine machine condensate water main road can not be affected, when needs overhaul low-pressure heater 900, close low-pressure heater water intaking valve 911 and low-pressure heater outlet valve 921.
In the present embodiment, the first water inlet pipe 310 is also provided with water regulating valve 312, in order to regulate the condensing water flow entering First Heat Exchanger 300, and then can indirectly regulate fume afterheat uptake.
The input of the second water side of the second heat exchanger 400 is communicated with by the second water inlet pipe 410 with the output of hot net water system 500, the output of the second water side of the second heat exchanger 400 is communicated with by the second outlet pipe 420 with the input of hot net water system 500, second water inlet pipe 410 is provided with the second water intaking valve 411, second outlet pipe 420 is provided with the second outlet valve 421, shunt valve 430 is provided with between second water inlet pipe 410 and the second outlet pipe 420, shunt valve 430 is provided with bypass valve 431, shunt valve 430 and the second water inlet pipe 410 junction are provided with the first tie point (accompanying drawing does not identify), shunt valve 430 and the second outlet pipe 420 junction are provided with the second tie point (accompanying drawing does not identify), second water intaking valve 411 is between described first tie point and the second heat exchanger 400, second outlet valve 421 is between described second tie point and the second heat exchanger 400.When needs carry out repair and maintenance to described residual heat from boiler fume recovery system, directly can close the second water intaking valve 411 and the second outlet valve 421 and open bypass valve 431, second water inlet pipe 410 is communicated with by shunt valve 430 with the second outlet pipe 420 afterwards, ensures that hot net water main road normally uses.
Because traditional economizer 100 is after Boiler Furnace, with condensate water or hot net water direct heat transfer, pipeline is long, resistance is large, investment is large, booster lift is large, and the utility model First Heat Exchanger 300 and the second heat exchanger 400 all can be arranged in steam turbine building, close to condensate system and hot net water system, can the length of corresponding minimizing first water inlet pipe 310, first outlet pipe 320 and the second water inlet pipe 410, second outlet pipe 420, and then the high pressure pipe material consumption of the first water inlet pipe 310 and the first outlet pipe 320 can be reduced, reduce cost of manufacture.
The utility model efficiently utilizes the heat energy of flue gas, and flue-gas temperature is effectively reduced, and flue gas enters air again through deduster, desulfurization island, it also avoid the pollution to environment.Utilize flue gas afterbody waste heat to heat hot net water and condensate water respectively at Heating Period and non-heating period, reduce gross station heat rate, reduce coal consumption of power supply, improve unit efficiency, especially for lignite-fired unit, its exhaust gas temperature is higher, flue gas can utilize waste heat large, and exhaust heat utilization effect is more remarkable.Simultaneously, the utility model avoids the problem that identical pipeline different quality is used alternatingly, in the switching of Heating Period and non-heating period, only need to cut off respectively and be communicated with corresponding heat transferring medium closed circuit, steam turbine condensate water water quality can not be polluted, be conducive to that reliability requirement is high, fault rate requires that low construction safety carries out.Simultaneously, adopt heat transferring medium and boiler smoke heat exchange, afterwards heat transferring medium again with the indirect heat exchange mode of hot net water and condensate water heat exchange, condensate water and hot net water are not directly contacted with economizer 100, reduce the pouring of economizer 100, raw material cost of manufacture can be saved.
Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this description is recorded.
The above embodiment only have expressed several embodiment of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to utility model patent scope.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.
Claims (7)
1. a residual heat from boiler fume recovery system, it is characterized in that, comprise economizer, the pump housing, First Heat Exchanger, second heat exchanger, hot net water system and condensate system, described economizer, the heat transferring medium side of described First Heat Exchanger and the described pump housing are communicated with formation first closed circuit successively, described economizer, the heat transferring medium side of described second heat exchanger and the described pump housing are communicated with formation second closed circuit successively, first water side of described First Heat Exchanger is communicated with formation first heat-exchanging loop with described condensate system, second water side and the described hot net water system connectivity of described second heat exchanger form the second heat-exchanging loop.
2. residual heat from boiler fume recovery system according to claim 1, it is characterized in that, also comprise the first triple valve and the second triple valve, described first triple valve is provided with the first joint, the second joint, the 3rd joint, described first joint is communicated with the heat transferring medium side output of described economizer, described second joint is communicated with the heat transferring medium side input of described First Heat Exchanger, and described 3rd joint is communicated with the heat transferring medium side input of described second heat exchanger; Described second triple valve is provided with the 4th joint, the 5th joint and the 6th joint, described 4th joint is communicated with the heat transferring medium side input of described economizer, described 5th joint is communicated with the heat transferring medium side output of described First Heat Exchanger, and described 6th joint is communicated with the heat transferring medium side output of described second heat exchanger.
3. residual heat from boiler fume recovery system according to claim 2, is characterized in that, the heat transferring medium side input of described economizer is also communicated with heat transferring medium feed system.
4. residual heat from boiler fume recovery system according to claim 1, it is characterized in that, also comprise low-pressure heater, the input of described low-pressure heater is communicated with by low-pressure heater water inlet pipe with the output of described condensate system, the output of described low-pressure heater is communicated with by low-pressure heater outlet pipe with the input of described condensate system, the input of the first water side of described First Heat Exchanger is communicated with by the first water inlet pipe with described low-pressure heater water inlet pipe, the output of the first water side of described First Heat Exchanger is communicated with by the first outlet pipe with described low-pressure heater outlet pipe, described first water inlet pipe is provided with the first water intaking valve, described first outlet pipe is provided with the first outlet valve.
5. residual heat from boiler fume recovery system according to claim 1, it is characterized in that, the input of the second water side of described second heat exchanger is communicated with by the second water inlet pipe with the output of described hot net water system, the output of the second water side of described second heat exchanger is communicated with by the second outlet pipe with the input of described hot net water system, described second water inlet pipe is provided with the second water intaking valve, described second outlet pipe is provided with the second outlet valve, shunt valve is provided with between described second water inlet pipe and described second outlet pipe, described shunt valve is provided with bypass valve, described shunt valve and described second water inlet pipe junction are provided with the first tie point, described shunt valve and described second outlet pipe junction are provided with the second tie point, described second water intaking valve is between described first tie point and described second heat exchanger, described second outlet valve is between described second tie point and described second heat exchanger.
6. residual heat from boiler fume recovery system according to claim 4, is characterized in that, described first water inlet pipe is provided with water regulating valve.
7. the residual heat from boiler fume recovery system according to any one of claim 1 to 6, is characterized in that, the heat transferring medium of described heat transferring medium side is demineralized water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520615453.5U CN204880080U (en) | 2015-08-14 | 2015-08-14 | Waste heat of boiler flue gas recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520615453.5U CN204880080U (en) | 2015-08-14 | 2015-08-14 | Waste heat of boiler flue gas recovery system |
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| Publication Number | Publication Date |
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| CN204880080U true CN204880080U (en) | 2015-12-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520615453.5U Withdrawn - After Issue CN204880080U (en) | 2015-08-14 | 2015-08-14 | Waste heat of boiler flue gas recovery system |
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| CN (1) | CN204880080U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105180144A (en) * | 2015-08-14 | 2015-12-23 | 中国能源建设集团广东省电力设计研究院有限公司 | Boiler flue gas waste heat recovery system |
-
2015
- 2015-08-14 CN CN201520615453.5U patent/CN204880080U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105180144A (en) * | 2015-08-14 | 2015-12-23 | 中国能源建设集团广东省电力设计研究院有限公司 | Boiler flue gas waste heat recovery system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20151216 Effective date of abandoning: 20180316 |
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| AV01 | Patent right actively abandoned |