CN112879938A - Machine-furnace coupled waste heat deep utilization system of bituminous coal unit - Google Patents
Machine-furnace coupled waste heat deep utilization system of bituminous coal unit Download PDFInfo
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- CN112879938A CN112879938A CN202110101063.6A CN202110101063A CN112879938A CN 112879938 A CN112879938 A CN 112879938A CN 202110101063 A CN202110101063 A CN 202110101063A CN 112879938 A CN112879938 A CN 112879938A
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- Prior art keywords
- flue gas
- heat exchanger
- heat
- machine
- bituminous coal
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- 239000002918 waste heat Substances 0.000 title claims abstract description 17
- 239000002802 bituminous coal Substances 0.000 title claims abstract description 15
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 53
- 239000003546 flue gas Substances 0.000 claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000007789 gas Substances 0.000 claims abstract description 13
- 230000001172 regenerating effect Effects 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims 4
- 238000010168 coupling process Methods 0.000 claims 4
- 238000005859 coupling reaction Methods 0.000 claims 4
- 230000002427 irreversible effect Effects 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000000605 extraction Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 239000003245 coal Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000003303 reheating Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0014—Recuperative heat exchangers the heat being recuperated from waste air or from vapors
-
- 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
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Air Supply (AREA)
Abstract
The invention discloses a machine-furnace coupled waste heat deep utilization system of a bituminous coal unit, which comprises a main flue and a bypass flue connected with the main flue in parallel, wherein a medium-temperature flue gas heat exchanger is arranged in the bypass flue, and the medium-temperature flue gas heat exchanger is connected with a primary air heater through a circulating heat medium water pipeline. The invention has the beneficial effects that: this scheme utilization medium temperature gas heater can carry out the heat exchange with the flue gas in the bypass flue to retrieve the heat in the flue gas, improve the utilization of heat energy and strain, and can heat a wind, produce irreversible loss when avoiding a wind and bypass cold wind mixing.
Description
Technical Field
The invention relates to the technical field of power generation of coal-fired units, in particular to a machine-furnace coupled waste heat deep utilization system of a bituminous coal unit.
Background
As China has rich coal resources, coal-fired power stations occupy the leading position in power systems. The boiler is one of main devices of a thermal power unit, is a main thermal power device, and is also a main source with high pollution and high energy consumption. In each heat loss of the boiler, the heat loss of the exhaust smoke is the largest one, and accounts for about 70-80% of the heat loss of the boiler. The waste heat level of the boiler exhaust smoke can be effectively improved by arranging the bypass flue, the high-grade steam extraction of the steam turbine is squeezed out, the work done by the steam turbine is increased, and the phenomenon of insufficient heating of air can be caused by the arrangement of the bypass flue.
Simultaneously, in order to guarantee the safe and stable operation of boiler powder process system, the coal pulverizer entry primary air temperature should be controlled in the allowed band, and boiler air heater export primary air temperature is higher, in order to prevent among the powder process system high temperature and lead to the buggy spontaneous combustion, and air heater export primary air can mix with bypass cold wind, produces great irreversible loss.
At present, partial extracted steam of a reheating unit has very high superheat degree, an external steam cooler is usually adopted to heat water supply, and the superheat degree of extracted steam is reduced, but the water supply temperature of a reheating system cannot be too high due to material limitation.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a machine-furnace coupled waste heat deep utilization system of a bituminous coal unit, which is used for reducing the exhaust gas temperature, recovering the waste heat of the flue gas, avoiding the irreversible loss in the primary air mixing process, reducing the superheat degree of extracted steam of part of the unit and improving the unit efficiency.
The invention is realized by the following technical scheme: the utility model provides a bituminous coal unit machine stove coupled waste heat degree of depth utilizes system, includes the flue duct, with the bypass flue of flue duct parallel connection, its characterized in that: the bypass flue is internally provided with a medium-temperature flue gas heat exchanger, and the medium-temperature flue gas heat exchanger is connected with the primary air heater through a circulating heat medium water pipeline.
Further, in order to better realize the invention, the primary air heater is connected with a primary air heater in series.
Further, in order to better realize the invention, the main flue is sequentially provided with an air preheater and a low-temperature flue gas heat exchanger according to the gas circulation direction, the outlet of the air pipeline of the air preheater is provided with a secondary air heater, and the inlet of the air pipeline of the air preheater is communicated with a secondary air heater.
Furthermore, in order to better realize the invention, the low-temperature flue gas heat exchanger is connected with a secondary air heater through a circulating heat medium water pipeline.
Furthermore, in order to better realize the invention, the low-temperature flue gas heat exchanger is connected with the primary air heater through a circulating heat medium water pipeline.
Furthermore, in order to better realize the invention, a high-temperature flue gas heat exchanger positioned in front of the medium-temperature flue gas heat exchanger is arranged in the bypass flue according to the gas flowing direction.
Further, in order to better realize the invention, the high-temperature flue gas heat exchanger is connected in parallel with the high-pressure heater A, the high-pressure heater B and the high-pressure heater C of the turbine regenerative system, and valves are arranged on the parallel pipelines.
Further, in order to better realize the invention, the secondary air heater is connected with the steam cooler through a circulating heat medium water pipeline.
The beneficial effect that this scheme obtained is: this scheme utilization medium temperature gas heater can carry out the heat exchange with the flue gas in the bypass flue to retrieve the heat in the flue gas, improve the utilization of heat energy and strain, and can heat a wind, produce irreversible loss when avoiding a wind and bypass cold wind mixing.
Drawings
FIG. 1 is a schematic diagram of a system configuration;
the system comprises a main flue 1, a bypass flue 2, an air preheater 3, a high-temperature flue gas heat exchanger 4, a medium-temperature flue gas heat exchanger 5, a low-temperature flue gas heat exchanger 6, a primary air heater 7, a primary air heater 8, a secondary air heater 9, a secondary air heater 10, a steam cooler 11, a high-pressure cylinder 12, a medium-pressure cylinder 13, a low-pressure cylinder 14, a generator 15, a condenser 16, a condensate pump 17, a low-pressure heater 18-A, a low-pressure heater 19-B, a low-pressure heater 20-C, a low-pressure heater 21-D, a deaerator 22, a water feed pump 23, a high-pressure heater 24-A, a high-pressure heater 25-B and a high-pressure heater 26-C.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Example 1:
as shown in fig. 1, in this embodiment, a machine-furnace coupled waste heat deep utilization system of a bituminous coal unit includes a main flue 1 and a bypass flue 2 connected in parallel with the main flue 1, and is characterized in that: and a medium-temperature flue gas heat exchanger 5 is arranged in the bypass flue 2, and the medium-temperature flue gas heat exchanger 5 is connected with a primary air heater 8 through a circulating heat medium water pipeline.
The high-temperature flue gas entering the bypass flue 2 exchanges heat with the medium-temperature flue gas heat exchanger 5 when passing through the medium-temperature flue gas heat exchanger 5, the medium-temperature flue gas heat exchanger 5 recovers part of heat energy in the high-temperature flue gas, and exchanges heat with primary air in the primary air heater 8 through water in the circulating heat medium water pipeline, so that the temperature of the primary air is increased. Irreversible loss occurring when heated primary air is mixed with bypass cold air is avoided. This scheme has improved the heat recovery rate in the high temperature flue gas, avoids the heat loss of wind, can improve the holistic efficiency of unit.
Example 2:
on the basis of the above embodiments, in the present embodiment, the primary air heater 8 is connected to the primary air heater 7. The primary air heater 7 can be used for heating the primary air before the primary air is subjected to heat exchange in the primary air heater 8, so that the temperature difference between the primary air and the heat medium water in the primary air heater 8 can be reduced, and the heat exchange efficiency of the primary air in the primary air heater 8 can be improved.
Example 3:
on the basis of the above embodiments, in this embodiment, the air preheater 3 and the low-temperature flue gas heat exchanger 6 are sequentially arranged in the main flue 1 according to the gas flow direction, the secondary air heater 10 is arranged at the outlet of the air pipeline of the air preheater 3, and the inlet of the air pipeline of the air preheater 3 is communicated with the secondary air heater 9.
The heat energy of the flue gas in the main flue 1 can be recovered by the air preheater 3, and the heat energy recovery rate of the flue gas is improved. The low-temperature flue gas heat exchanger 6 can exchange heat with low-temperature flue gas which is subjected to heat exchange by the air preheater 3 and the medium-temperature flue gas heat exchanger 5, so that heat energy in the low-temperature flue gas is further recovered, and the heat energy recovery rate of the flue gas is improved.
The secondary air heater 9 can heat the secondary air. After being heated by the secondary air heater 9, the secondary air enters the air preheater 3 to be continuously heated, and then enters the secondary air heater 10 to exchange heat and then enters the hearth.
In this embodiment, the low-temperature flue gas heat exchanger 6 is connected with the secondary air heater 9 through a circulating heat medium water pipeline. The low-temperature flue gas heat exchanger 6 is used as a heat source to heat the heat medium water, and the heated heat medium water heats secondary air passing through the secondary air heater 9 in the secondary air heater 9, so that the utilization rate of heat energy is improved.
In this embodiment, the low-temperature flue gas heat exchanger 6 is connected with the primary air heater 7 through a circulating heat medium water pipeline. With this heat medium water that makes low temperature gas heater 6 heat can circulate between low temperature gas heater 6, first wind air heater 7, overgrate air heater 9 to make the heat medium water of low temperature gas heater 6 heating heat the ratio of utilization that the overgrate air heated in overgrate air heater 9, be favorable to improving heat energy respectively in first wind air heater 7 to first wind heating.
Example 4:
on the basis of the above embodiment, in this embodiment, according to the gas flowing direction, the high temperature flue gas heat exchanger 4 located in front of the medium temperature flue gas heat exchanger 5 is arranged in the bypass flue 2. The flue gas circulating in the bypass flue 2 firstly exchanges heat with the high-temperature flue gas heat exchanger 4, loses part of heat energy, and then exchanges heat with the medium-temperature flue gas heat exchanger 5. With this heat energy that can divide the interior flue gas of two stages recovery bypass 2 improves the recycle ratio of heat energy, can also avoid the heat medium water temperature in the medium temperature gas heater 5 too high, avoids the primary air temperature after the heat transfer in primary air heater 8 to exceed the temperature requirement that gets into the coal pulverizer, is favorable to guaranteeing the safety of unit.
In this embodiment, the high-temperature flue gas heat exchanger 4 is connected in parallel with a high-pressure heater a 24, a high-pressure heater B25 and a high-pressure heater C26 of a turbine regenerative system, and valves are arranged on parallel pipelines. The boiler feed water is heated by the high-temperature flue gas, the steam extraction amount of the A high-pressure heater 24, the B high-pressure heater 25 and the C high-pressure heater 26 is reduced, more steam works in the steam turbine, and the unit efficiency is improved.
Example 5:
on the basis of the above embodiments, in the present embodiment, the secondary air heater 10 is connected to the steam cooler 11 through a circulation heat medium water pipe. The steam cooler 11 is arranged on a first-stage regenerative steam extraction pipeline after reheating, the heat of high-temperature steam extraction is absorbed by the steam cooler 11 through a circulating heat medium water system, secondary air at the outlet of the air preheater 3 is further heated in the secondary air heater 10, the degree of superheat of the regenerative steam extraction is reduced, and the unit efficiency can be improved.
In this embodiment, other undescribed contents are the same as those in the above embodiment, and thus are not described again.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (8)
1. The utility model provides a waste heat degree of depth utilization system of bituminous coal unit machine stove coupling, includes main flue (1), bypass flue (2) parallelly connected with main flue (1), its characterized in that: the bypass flue (2) is internally provided with a medium temperature flue gas heat exchanger (5), and the medium temperature flue gas heat exchanger (5) is connected with a primary air heater (8) through a circulating heat medium water pipeline.
2. The machine-furnace coupled waste heat deep utilization system of the bituminous coal unit according to claim 1, characterized in that: the primary air heater (8) is connected with the primary air heater (7) in series.
3. The machine-furnace coupled waste heat deep utilization system of the bituminous coal unit according to claim 2, characterized in that: the air preheater (3) and the low-temperature flue gas heat exchanger (6) are sequentially arranged in the main flue (1) according to the gas circulation direction, the secondary air heater (10) is arranged at the outlet of the air pipeline of the air preheater (3), and the inlet of the air pipeline of the air preheater (3) is communicated with the secondary air heater (9).
4. The deep waste heat utilization system for the machine-furnace coupling of the bituminous coal unit according to claim 3, wherein: the low-temperature flue gas heat exchanger (6) is connected with a secondary air heater (9) through a circulating heat medium water pipeline.
5. The deep waste heat utilization system for the machine-furnace coupling of the bituminous coal unit according to claim 3, wherein: the low-temperature flue gas heat exchanger (6) is connected with a primary air heater (7) through a circulating heat medium water pipeline.
6. The machine-furnace coupled waste heat deep utilization system of the bituminous coal unit according to claim 1, characterized in that: according to the gas flowing direction, a high-temperature flue gas heat exchanger (4) positioned in front of the medium-temperature flue gas heat exchanger (5) is arranged in the bypass flue (2).
7. The deep waste heat utilization system for the machine-furnace coupling of the bituminous coal unit according to claim 6, wherein: the high-temperature flue gas heat exchanger (4) is connected with a high-pressure heater A (24), a high-pressure heater B (25) and a high-pressure heater C (26) of a turbine regenerative system in parallel, and valves are arranged on parallel pipelines.
8. The machine-furnace coupled waste heat deep utilization system of the bituminous coal unit according to claim 1, characterized in that: the secondary air heater (10) is connected with the steam cooler (11) through a circulating heat medium water pipeline.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110101063.6A CN112879938A (en) | 2021-01-26 | 2021-01-26 | Machine-furnace coupled waste heat deep utilization system of bituminous coal unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110101063.6A CN112879938A (en) | 2021-01-26 | 2021-01-26 | Machine-furnace coupled waste heat deep utilization system of bituminous coal unit |
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0558899B1 (en) * | 1992-03-06 | 1996-03-13 | GEA LUFTKÜHLER GmbH | System for using the heat of the exhaust gases from a coal-fired boiler |
| CN103244944A (en) * | 2013-05-14 | 2013-08-14 | 华北电力大学 | Air preheating system and method performing steam extraction by utilizing steam turbine |
| CN203375432U (en) * | 2013-06-09 | 2014-01-01 | 中船重工（上海）新能源有限公司 | Protective device of low-temperature heating surface at tail of boiler |
| CN205383589U (en) * | 2016-01-27 | 2016-07-13 | 内蒙古京能锡林发电有限公司 | Novel energy -efficient application system of afterbody flue gas heat energy set |
| CN205717145U (en) * | 2016-04-13 | 2016-11-23 | 华北电力大学 | A kind of comprehensive residual heat using device of First air warm depth optimization |
| CN107687634A (en) * | 2017-06-23 | 2018-02-13 | 山东泓奥电力科技有限公司 | The denitration of boiler full load couples fume afterheat gradient utilization system |
| CN208504436U (en) * | 2018-05-08 | 2019-02-15 | 山东电力工程咨询院有限公司 | Smoke waste heat utilization system and boiler based on multiple level and recycling heating cold wind |
| CN110207144A (en) * | 2019-05-27 | 2019-09-06 | 东方电气集团东方锅炉股份有限公司 | Air preheat and smoke waste heat utilization system and control method based on level-density parameter |
| CN209926385U (en) * | 2019-01-15 | 2020-01-10 | 青岛华晨伟业电力科技工程有限公司 | Flue gas waste heat optimization system of heat supply unit |
| CN210197332U (en) * | 2019-05-23 | 2020-03-27 | 中国电力工程顾问集团东北电力设计院有限公司 | Cascade utilization deep coupling system for smoke, wind and sewage waste heat of coal-fired boiler |
| CN111120026A (en) * | 2019-12-23 | 2020-05-08 | 东方电气集团东方汽轮机有限公司 | Mechanical furnace deep coupling thermodynamic system of thermal power generating unit |
-
2021
- 2021-01-26 CN CN202110101063.6A patent/CN112879938A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0558899B1 (en) * | 1992-03-06 | 1996-03-13 | GEA LUFTKÜHLER GmbH | System for using the heat of the exhaust gases from a coal-fired boiler |
| CN103244944A (en) * | 2013-05-14 | 2013-08-14 | 华北电力大学 | Air preheating system and method performing steam extraction by utilizing steam turbine |
| CN203375432U (en) * | 2013-06-09 | 2014-01-01 | 中船重工（上海）新能源有限公司 | Protective device of low-temperature heating surface at tail of boiler |
| CN205383589U (en) * | 2016-01-27 | 2016-07-13 | 内蒙古京能锡林发电有限公司 | Novel energy -efficient application system of afterbody flue gas heat energy set |
| CN205717145U (en) * | 2016-04-13 | 2016-11-23 | 华北电力大学 | A kind of comprehensive residual heat using device of First air warm depth optimization |
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