CN112503556A - Flue gas waste heat recovery device of thermal power generating unit boiler - Google Patents
Flue gas waste heat recovery device of thermal power generating unit boiler Download PDFInfo
- Publication number
- CN112503556A CN112503556A CN202011389311.3A CN202011389311A CN112503556A CN 112503556 A CN112503556 A CN 112503556A CN 202011389311 A CN202011389311 A CN 202011389311A CN 112503556 A CN112503556 A CN 112503556A
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- CN
- China
- Prior art keywords
- flue gas
- recovery device
- heat exchanger
- waste heat
- gas waste
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- 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
- F23J15/006—Layout of treatment plant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/02—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnace, fire tubes, or flue ways
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- 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
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- 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
- F23L15/04—Arrangements of recuperators
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- 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
Abstract
The invention provides a flue gas waste heat recovery device of a thermal power generating unit boiler, which comprises a flue gas main circuit, wherein an air preheater and a warm air system are sequentially arranged on the flue gas main circuit, the warm air system is respectively connected with a primary air heater on a primary air pipeline and a secondary air heater on a secondary air pipeline through a circulating pipeline, and a partition assembly is arranged in the warm air system and used for partitioning a runner space to distribute heat. The flue gas waste heat recovery device is simple in structure and easy to implement, and the heat exchange area of the flow channel space is allocated through the baffle assembly in the unit variable working condition operation, so that the distribution and adjustment of the flue gas waste heat are realized, and the effect of safe, flexible and economic operation is achieved.
Description
Technical Field
The invention relates to the technical field of flue gas waste heat recovery, in particular to a flue gas waste heat recovery device of a boiler of a thermal power generating unit.
Background
In recent years, due to the fact that a large amount of renewable energy sources such as wind power and solar energy are connected, thermal power generating units in China need to participate in deep peak shaving and are in frequent variable load operation, flue gas of a boiler has high temperature after passing through an air preheater, waste heat of the flue gas cannot be effectively recovered, and the heat of the flue gas of the thermal power generating units is not fully utilized. The energy conservation and emission reduction of the thermal power generating unit is crucial to the sustainable development of the economic society of China, and the efficient and deep recycling of the boiler exhaust waste heat is a problem that the thermal power generating unit needs to pay attention to and needs to be solved urgently.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a flue gas waste heat recovery device of a boiler of a thermal power generating unit, which aims to solve the problem that the flue gas of the boiler of the existing thermal power generating unit cannot be efficiently and deeply recycled.
In order to solve the technical problem, the invention provides a flue gas waste heat recovery device of a boiler of a thermal power generating unit, which comprises a flue gas main circuit, wherein an air preheater and a warm air system are sequentially arranged on the flue gas main circuit, the warm air system is respectively connected with a primary air heater on a primary air pipeline and a secondary air heater on a secondary air pipeline through a circulating pipeline, and a barrier component is arranged in the warm air system and used for dividing a runner space to distribute heat.
Furthermore, the warm air system comprises a first heat exchanger and a second heat exchanger which are arranged in parallel, the first heat exchanger is connected with the primary air heater through a circulating pipeline, and the second heat exchanger is connected with the secondary air heater through a circulating pipeline.
Furthermore, the air heater further comprises a flue gas bypass, and outlet flue gas of the flue gas bypass and outlet flue gas of the air preheater are converged and then enter the warm air system.
Further, a high-temperature economizer, a third heat exchanger and a low-temperature economizer are sequentially arranged on the flue gas bypass.
Furthermore, the third heat exchanger is connected with the primary air sub-heater through a circulating pipeline, and the primary air sub-heater is arranged on the primary air pipeline.
Furthermore, the first heat exchanger, the second heat exchanger and the third heat exchanger all adopt H-shaped fin heat exchange tubes.
Furthermore, the primary air heater and the primary air sub-heater both adopt spiral fin heat exchange tubes.
Furthermore, the barrier component comprises a barrier plate or a rolling gate, and the barrier component is arranged in the smoke flowing direction in parallel.
Furthermore, the first heat exchanger and the second heat exchanger are arranged in groups by adopting tube bundles.
Further, the secondary air pipeline is connected with the air preheater.
Compared with the prior art, the invention has the beneficial effects that:
the flue gas waste heat recovery device of the thermal power unit boiler is simple in structure and easy to implement, and the partition assembly is arranged in the warm air system to divide the flow channel space and allocate the heat exchange area, so that the distribution and adjustment of the flue gas waste heat are realized, and the effect of safe, flexible and economic operation is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a flue gas waste heat recovery device of a thermal power generating unit boiler provided by the invention.
Description of reference numerals:
1-primary air pipeline; 2-secondary air pipeline;
3-main path of flue gas; 4-flue gas bypass;
11-primary air heater; 21-secondary air heater;
31-an air preheater; 32-a warm air system;
321-a first heat exchanger; 322-a second heat exchanger;
41-high temperature economizer; 42-a third heat exchanger;
43-low temperature economizer; 44-primary air heater.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, the flue gas waste heat recovery device of a boiler of a thermal power generating unit, provided by the invention, comprises a flue gas main path 3, wherein an air preheater 31 and a warm air system 32 are sequentially arranged on the flue gas main path 3, the warm air system 32 is respectively connected with a primary air heater 11 on a primary air pipeline 1 and a secondary air heater 21 on a secondary air pipeline 2 through a circulation pipeline, and it needs to be emphasized that a partition assembly is further arranged in the warm air system 32 to divide a flow channel space to distribute heat. The flow channel space of the heater system 32 is divided by adjusting the position of the partition assembly, so that the heat is distributed.
Specifically, the warm air system 32 comprises a first heat exchanger 321 and a second heat exchanger 322 which are arranged in parallel, the first heat exchanger 321 is connected with the primary air heater 11 through a circulation pipeline, the second heat exchanger 322 is connected with the secondary air heater 21 through a circulation pipeline, the smoke flow of the first heat exchanger 321 transfers heat to the primary air heater 11 through the circulation pipeline under the action of a circulation pump, so that primary air is heated, and the primary air is heated and then sent to the coal pulverizer; the flue gas flow of the second heat exchanger 322 transfers the heat to the secondary air heater 21 through the circulation pipeline under the action of the circulation pump, and then heats the secondary air, in this embodiment, the secondary air pipeline 2 is connected with the air preheater 31, so the secondary air is heated and then sent to the air preheater 31; the residual flue gas flow in the warm air system 32 enters the electric dust removing equipment.
The baffle assembly in the invention includes but is not limited to any one of baffle plate or rolling gate, and the baffle assembly is arranged in parallel in the smoke flowing direction. In actual operation, the position of the baffle assembly can be adjusted according to the requirement of on-site heat distribution, in the adjusting process, the baffle assembly moves and is adjusted from top to bottom, the two sides of the baffle assembly are fixedly contacted with the front wall surface and the rear wall surface of the warm air system 32, the flow channel space of the warm air system 32 and the primary air heater 11 is adjusted, and therefore redistribution of heat exchange area is achieved.
Further, the flue gas waste heat recovery device further comprises a flue gas bypass 4, and outlet flue gas of the flue gas bypass 4 and outlet flue gas of the air preheater 31 are converged and then enter the warm air system 32. The flue gas bypass 4 is sequentially provided with a high-temperature economizer 41, a third heat exchanger 42 and a low-temperature economizer 43. The third heat exchanger 42 is connected with the primary air heater 44 through a circulating pipeline, the primary air heater 44 is arranged on the primary air pipeline 1, the smoke flow of the third heat exchanger 42 transfers heat to the primary air heater 44 through the circulating pipeline under the action of the circulating pump, and the primary air is heated by the primary air heater 11, is continuously heated by the primary air heater 44 and is sent to the coal pulverizer.
On the basis of the scheme, the first heat exchanger 321, the second heat exchanger 322 and the third heat exchanger 42 all adopt H-shaped fin heat exchange tubes, the H-shaped fin heat exchange tubes are arranged in sequence, the fins divide the surface space of the steel pipe into a plurality of small areas, the flow equalization effect is achieved on smoke, the H-shaped finned tubes are good in steel structure and not prone to deformation, and the abrasion service life is longer.
On the basis of the scheme, the primary air heater 11 and the primary air heater 44 both adopt spiral fin heat exchange tubes, and compared with other spiral fin heat exchangers, the spiral fin heat exchange tubes increase the heat exchange area in an effective space and improve the heat transfer effect.
On the basis of the scheme, the first heat exchanger 321 and the second heat exchanger 322 both adopt a tube bundle grouping arrangement mode, and the arrangement can improve the heat transfer efficiency.
The operation of the flue gas waste heat recovery device of a boiler of a thermal power generating unit according to the present invention will be briefly described below.
The flue gas of SCR export is shunted, and partly gets into flue gas main road 3, and in another part gets into flue gas bypass 4, the flue gas in flue gas main road 3 gets into warm braw system 32 after preheating through air preheater 31 in proper order, and in warm braw system 32, flue gas flow distributes to carry out thermal distribution, wherein heat for air pipe 1, overgrate air pipe 2 through air heater 11, overgrate air heater 21 respectively. The flue gas in the flue gas bypass 4 sequentially passes through a high-temperature economizer 41, a third heat exchanger 42 and a low-temperature economizer 43, the third heat exchanger 42 transfers heat to a primary air sub-heater 44, the primary air is heated by a primary air heater 11 and then is continuously heated by the primary air sub-heater 44 and then is sent to a coal mill, the secondary air is heated by a secondary air heater 21 and then is sent to an air preheater 31, and the residual flue gas flow enters the electric dust removal device.
In a word, the flue gas waste heat recovery device of the thermal power unit boiler has a simple structure and is easy to implement, and the partition assembly is arranged in the warm air system to divide the flow channel space and further allocate the heat exchange area, so that the distribution and adjustment of the flue gas waste heat are realized, and the effect of safe, flexible and economic operation is achieved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a flue gas waste heat recovery device of thermal power unit boiler, its characterized in that, includes the flue gas main road, air preheater and warm braw system have set gradually on the flue gas main road, the warm braw system respectively with the primary air heater on the primary air pipeline, the overgrate air heater on the overgrate air pipeline pass through circulation pipeline and connect, be provided with in the warm braw system and separate the shelves subassembly in order to be used for dividing the runner space and carry out the heat distribution.
2. The flue gas waste heat recovery device according to claim 1, wherein the warm air system comprises a first heat exchanger and a second heat exchanger which are arranged in parallel, the first heat exchanger and the primary air heater are connected through a circulation pipeline, and the second heat exchanger and the secondary air heater are connected through a circulation pipeline.
3. The flue gas waste heat recovery device according to claim 2, further comprising a flue gas bypass, wherein outlet flue gas of the flue gas bypass and outlet flue gas of the air preheater are merged and then enter the warm air system.
4. The flue gas waste heat recovery device according to claim 3, wherein a high-temperature economizer, a third heat exchanger and a low-temperature economizer are sequentially arranged on the flue gas bypass.
5. The flue gas waste heat recovery device according to claim 4, wherein the third heat exchanger and the primary air sub-heater are connected through a circulation pipeline, and the primary air sub-heater is arranged on the primary air pipeline.
6. The flue gas waste heat recovery device of claim 4, wherein the first heat exchanger, the second heat exchanger and the third heat exchanger are all H-shaped fin heat exchange tubes.
7. The flue gas waste heat recovery device according to claim 5, wherein the primary air heater and the primary air sub-heater both adopt spiral fin heat exchange tubes.
8. The flue gas waste heat recovery device according to claim 1, wherein the barrier component comprises any one of a barrier plate or a rolling gate, and the barrier component is arranged in parallel in the flow direction of the flue gas.
9. The flue gas waste heat recovery device according to claim 4, wherein the first heat exchanger and the second heat exchanger are arranged in groups by using tube bundles.
10. The flue gas waste heat recovery device according to claim 1, wherein the secondary air pipeline is connected with the air preheater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011389311.3A CN112503556A (en) | 2020-12-02 | 2020-12-02 | Flue gas waste heat recovery device of thermal power generating unit boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011389311.3A CN112503556A (en) | 2020-12-02 | 2020-12-02 | Flue gas waste heat recovery device of thermal power generating unit boiler |
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| CN112503556A true CN112503556A (en) | 2021-03-16 |
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| CN202011389311.3A Pending CN112503556A (en) | 2020-12-02 | 2020-12-02 | Flue gas waste heat recovery device of thermal power generating unit boiler |
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| CN111425878A (en) * | 2020-05-11 | 2020-07-17 | 国电科学技术研究院有限公司 | Boiler tail flue gas waste heat degree of depth cascade utilization system |
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Application publication date: 20210316 |
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