CN110762512A - Deep energy-saving waste heat recovery system and method for tubular heating furnace - Google Patents
Deep energy-saving waste heat recovery system and method for tubular heating furnace Download PDFInfo
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- CN110762512A CN110762512A CN201911029198.5A CN201911029198A CN110762512A CN 110762512 A CN110762512 A CN 110762512A CN 201911029198 A CN201911029198 A CN 201911029198A CN 110762512 A CN110762512 A CN 110762512A
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- heat exchange
- heat
- flue gas
- heating furnace
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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
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
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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
- F22D1/16—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged otherwise than in the boiler furnace, fire tubes, or flue ways
- F22D1/18—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged otherwise than in the boiler furnace, fire tubes, or flue ways and heated indirectly
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Supply (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The embodiment of the invention provides a deep energy-saving waste heat recovery system of a tubular heating furnace, which comprises a primary flue gas heat exchange unit, a secondary flue gas heat exchange unit and an air heat exchange unit. Boiler feed water firstly exchanges heat with the smoke of the tubular heating furnace for the first time in the first-stage smoke heat exchange unit, then exchanges heat with air for the second time in the air heat exchange unit, and then exchanges heat with the smoke for the third time in the second-stage smoke heat exchange unit. The system adopts air to exchange heat for boiler feed water after primary heat exchange, and then exchanges heat for the second time with flue gas, thereby further reducing the flue gas exhaust temperature and improving the heat efficiency of the heating furnace to more than 94%; the low-temperature heat is recovered by adopting air for combustion, so that the fuel consumption is saved, and the operation cost is reduced; boiler feed water and air are used as media, no additional media or process media are needed, and the system is simple and flexible to operate. The embodiment of the invention also provides a deep energy-saving waste heat recovery method for the tubular heating furnace.
Description
Technical Field
The invention belongs to the technical field of tubular heating furnaces, and particularly relates to a deep energy-saving waste heat recovery system for a tubular heating furnace, which is suitable for recovering flue gas waste heat by using a waste heat boiler in a convection section of the tubular heating furnace. The invention also provides a deep energy-saving waste heat recovery method for the tubular heating furnace.
Background
The tubular heating furnace is a main energy consumption device in the petrochemical device, the energy-saving core of the petrochemical device lies in the application of the energy-saving technology of the tubular heating furnace, and the heat efficiency of the heating furnace is improved by reducing the smoke exhaust temperature of the tubular heating furnace so as to reduce the fuel consumption and the overall energy consumption of the device, thereby having important economic benefits.
For a long time, a part of tubular heating furnaces, such as a reforming four-in-one heating furnace, a dehydrogenation process heating furnace, a styrene process heating furnace and the like, adopt a waste heat boiler in a convection section for flue gas waste heat recovery. In the prior art, the water supply temperature of the coal saving section of the last section of the boiler for flue gas heat exchange is limited by deoxidization, usually over 104 ℃, and limited by the temperature of a cold end medium, the temperature of the flue gas cannot be reduced to be lower, usually over 130 ℃, the thermal efficiency is about 92 percent, and the thermal efficiency of a heating furnace is difficult to further improve; in order to reduce the exhaust gas temperature, part of enterprises adopt low-temperature cold water to reduce the exhaust gas temperature, and although the exhaust gas temperature is reduced, a large amount of hot water with extremely low temperature is generated by recovered heat, so that the actual economic value is not realized, and the number of matched facilities is increased, and the significance is not great; the prior art also adopts a hydrothermal medium air preheater technology, uses deoxidized water/desalted water as a heating medium, and establishes a newly-added closed-loop circulation system which is different from the original system so as to achieve the effect of waste heat recovery, but adopts deoxidized water/desalted water as a medium to circularly take out the waste heat of the flue gas, so that the system needs to be connected with a water system outside the system, the flow is long, the accessories are more, the complexity of operation is increased, non-condensable gas is generated in long-period operation, and the periodic treatment is needed.
Therefore, with the increasing energy-saving requirement of the tubular heating furnace, the development of a waste heat recovery technology which can deeply reduce the exhaust gas temperature of the tubular heating furnace and has effective economic benefits for heat recovery has important significance.
Disclosure of Invention
The invention aims to solve the technical problems that the exhaust gas temperature is difficult to reduce and the heat efficiency cannot be further improved in the process of recovering waste heat of a tubular heating furnace in the prior art, and provides a deep energy-saving waste heat recovery system and a waste heat recovery method of the tubular heating furnace, which can further reduce the exhaust gas temperature of the tubular heating furnace, really save fuel, effectively cooperate with system regulation and control, reduce the running cost of a device and realize deep energy conservation.
In order to solve the above technical problem, an embodiment of the present invention provides a deep energy saving waste heat recovery system for a tube-type heating furnace, including a primary flue gas heat exchange unit 11, a secondary flue gas heat exchange unit 12, and an air heat exchange unit 13, wherein:
the primary flue gas heat exchange unit 11 and the secondary flue gas heat exchange unit 12 are respectively a gas-liquid heat exchanger or a gas-liquid heat exchange section arranged in a convection section of the tubular heating furnace 2; the water paths of the primary flue gas heat exchange unit 11, the air heat exchange unit 13 and the secondary flue gas heat exchange unit 12 are sequentially connected in a water supply pipeline 21 of the tubular heating furnace 2, the flue paths of the primary flue gas heat exchange unit 11 and the secondary flue gas heat exchange unit 12 are sequentially arranged in a flue gas pipeline 22 of the tubular heating furnace 2, and the air heat exchange unit 13 is connected in an air pipeline 23 of the tubular heating furnace 2; boiler feed water of the tubular heating furnace 2 firstly exchanges heat with the flue gas of the tubular heating furnace 2 for the first time in the primary flue gas heat exchange unit 11, then enters the air heat exchange unit 13 to exchange heat with the air for the second time, and then enters the secondary flue gas heat exchange unit 12 to exchange heat with the flue gas for the third time.
Preferably, the gas-liquid heat exchanger is a tubular heat exchanger. Further preferably, the heat exchange tube of the tube heat exchanger is a tube or a light pipe with an outer expanding surface structure.
Preferably, the gas-liquid heat exchange section comprises a heat insulation wall and a heat exchange tube arranged in the heat insulation wall. Further preferably, the heat exchange tube is a tube or a light pipe with an outer expanding surface structure.
Preferably, the gas-liquid heat exchanger is an economizer, and the gas-liquid heat exchange section is a coal-saving section.
Preferably, the air heat exchange unit 13 is a gas-liquid heat exchanger.
Preferably, a boiler steam pocket is arranged in the water feeding pipeline 21 between the secondary flue gas heat exchange unit 12 and the tubular heating furnace 2.
The embodiment of the invention also provides a deep energy-saving waste heat recovery method for the tubular heating furnace, which comprises the following steps:
1. introducing boiler feed water and tubular heating furnace flue gas into a gas-liquid heat exchange device for primary heat exchange;
2. introducing air and the boiler feed water subjected to the first heat exchange into a gas-liquid heat exchange device for second heat exchange;
3. introducing the boiler feed water subjected to the second heat exchange and the flue gas subjected to the first heat exchange into a gas-liquid heat exchange device for third heat exchange;
4. and introducing the air subjected to the second heat exchange into the tubular heating furnace to be used as combustion-supporting air.
Preferably, the flue gas after the third heat exchange is discharged from a chimney, and the boiler feed water after the third heat exchange is introduced into a steam-water system of the tubular heating furnace through a boiler steam drum.
The deep energy-saving waste heat recovery system of the tubular heating furnace in the technical scheme of the embodiment of the invention can be used for deep energy saving of a waste heat boiler type waste heat recovery system of the tubular heating furnace in the field of petrochemical industry, can effectively reduce the exhaust gas temperature of the heating furnace, reduce heat loss and improve the heat efficiency of the tubular heating furnace, and has the following beneficial effects compared with the existing waste heat recovery system:
1. after the boiler feed water subjected to primary heat exchange is subjected to heat exchange by air, the temperature of the boiler feed water can be reduced to 60-80 ℃ which is far lower than 104 ℃ of thermal deoxidization, the problem of the temperature level of the deoxidization water is solved, secondary heat exchange is performed with flue gas, the flue gas exhaust temperature can be further reduced to 80-100 ℃, and the heat efficiency of the heating furnace is improved to more than 94%;
2. the low-temperature heat is recovered by adopting air for combustion, and the recovered heat is input into the furnace, so that the purposes of saving fuel consumption and reducing operation cost are really achieved;
3. the heat exchanger is used for gas-liquid heat exchange, the heat exchange coefficient is high, the heat exchange effect is good, the occupied area is saved, and the investment is reduced;
4. the used media are boiler feed water and air, which are internal media of the original boiler system, and no additional media or process media are needed, so that the system is simple;
5. the operation is flexible, the steam yield of the boiler system can be adjusted and controlled, and the gas demand of the device can be flexibly matched.
Drawings
FIG. 1 is a system diagram of a deep energy-saving waste heat recovery system for a tube-type heating furnace according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for deeply recycling energy-saving waste heat of a tube-type heating furnace according to an embodiment of the present invention.
[ main component symbol description ]
1-a deep energy-saving waste heat recovery system of a tubular heating furnace; 11-a first-stage flue gas heat exchange unit; 12-a secondary flue gas heat exchange unit; 13-an air heat exchange unit; 2-a tubular heating furnace; 21-water supply pipeline; 22-flue gas pipeline; 23-an air line; 24-a burner.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
Aiming at the existing problems, the invention provides a deep energy-saving waste heat recovery system and a waste heat recovery method for a tubular heating furnace, which can further reduce the exhaust gas temperature of the tubular heating furnace, really save fuel and effectively cooperate with system regulation and control.
The embodiment of the invention provides a deep energy-saving waste heat recovery system 1 of a tubular heating furnace as shown in fig. 1, which comprises a primary flue gas heat exchange unit 11, a secondary flue gas heat exchange unit 12 and an air heat exchange unit 13, wherein:
the first-stage flue gas heat exchange unit 11 and the second-stage flue gas heat exchange unit 12 can use gas-liquid heat exchangers; the gas-liquid heat exchanger can be a tubular heat exchanger, and a heat exchange tube of the tubular heat exchanger can be a tube or a light pipe with an outer expanding surface structure; the gas-liquid heat exchanger can also use an economizer;
the primary flue gas heat exchange unit 11 and the secondary flue gas heat exchange unit 12 can also be gas-liquid heat exchange sections arranged in the convection section of the tubular heating furnace 2, the gas-liquid heat exchange sections can comprise heat insulation structures and heat exchange tubes arranged in the heat insulation structures, and the heat exchange tubes can use tubes or light tubes with surface expanding structures; the gas-liquid heat exchange section can also be a coal-saving section;
the air heat exchange unit 13 may also use a gas-liquid heat exchanger.
The water paths of the primary flue gas heat exchange unit 11, the air heat exchange unit 13 and the secondary flue gas heat exchange unit 12 are sequentially connected in a water supply pipeline 21 of the tubular heating furnace 2, the flue paths of the primary flue gas heat exchange unit 11 and the secondary flue gas heat exchange unit 12 are sequentially arranged in a flue gas pipeline 22 of the tubular heating furnace 2, and the air heat exchange unit 13 is connected in an air pipeline 23 of the tubular heating furnace 2; boiler feed water of the tubular heating furnace 2 firstly exchanges heat with flue gas of the tubular heating furnace 2 for the first time in the primary flue gas heat exchange unit 11, then enters the air heat exchange unit 13 to exchange heat with air for the second time, and then enters the secondary flue gas heat exchange unit 12 to exchange heat with the flue gas for the third time.
In a better embodiment, an air blower is arranged in the air pipeline 23, the air after heat exchange in the air heat exchange unit 13 is introduced into the combustor 24 of the tubular heating furnace 2 to participate in combustion, a boiler steam pocket is arranged in the water supply pipeline 21 between the secondary flue gas heat exchange unit 12 and the tubular heating furnace 2, and the boiler feed water after the third heat exchange is introduced into a steam-water system of the tubular heating furnace through the boiler steam pocket.
In order to better realize the technical scheme, the invention also provides a deep energy-saving waste heat recovery method of the tubular heating furnace shown in fig. 2, which comprises the following steps:
s1, introducing boiler feed water and the tubular heating furnace flue gas into a gas-liquid heat exchange device for primary heat exchange;
s2, introducing the air and the boiler feed water subjected to the first heat exchange into a gas-liquid heat exchange device for second heat exchange;
s3, introducing the boiler feed water after the second heat exchange and the flue gas after the first heat exchange into a gas-liquid heat exchange device for third heat exchange;
and S4, introducing the air subjected to the secondary heat exchange into the tubular heating furnace to be used as combustion-supporting air.
The flue gas after the third heat exchange can be discharged from a chimney, and the boiler feed water after the third heat exchange is introduced into a steam-water system of the tubular heating furnace for use through a boiler steam drum.
For the embodiments of the present invention, the common general knowledge of the known specific structures and characteristics in the schemes is not described too much; the embodiments are described in a progressive manner, technical features related to the embodiments can be combined with each other on the premise of not conflicting with each other, and the same and similar parts among the embodiments can be referred to each other.
In the description of the present invention, the terms "primary," "secondary," "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The utility model provides an energy-conserving waste heat recovery system of tube heating furnace degree of depth which characterized in that, includes one-level flue gas heat transfer unit (11), second grade flue gas heat transfer unit (12) and air heat transfer unit (13), wherein:
the primary flue gas heat exchange unit (11) and the secondary flue gas heat exchange unit (12) are respectively a gas-liquid heat exchanger or a gas-liquid heat exchange section arranged in a convection section of the tubular heating furnace (2);
the water paths of the primary flue gas heat exchange unit (11), the air heat exchange unit (13) and the secondary flue gas heat exchange unit (12) are sequentially connected in a water supply pipeline (21) of the tubular heating furnace (2), the flue paths of the primary flue gas heat exchange unit (11) and the secondary flue gas heat exchange unit (12) are sequentially arranged in a flue gas pipeline (22) of the tubular heating furnace (2), and the air heat exchange unit (13) is connected in an air pipeline (23) of the tubular heating furnace (2);
boiler feed water of the tubular heating furnace (2) firstly exchanges heat with the flue gas of the tubular heating furnace (2) for the first time in the primary flue gas heat exchange unit (11), then enters the air heat exchange unit (13) to exchange heat with the air for the second time, and then enters the secondary flue gas heat exchange unit (12) to exchange heat with the flue gas for the third time.
2. The waste heat recovery system of claim 1, wherein the gas-to-liquid heat exchanger is a tubular heat exchanger.
3. The waste heat recovery system of claim 2, wherein the heat exchange tubes of the tube heat exchanger are tubes or light pipes with an outer expanding surface structure.
4. The waste heat recovery system of claim 1, wherein the gas-liquid heat exchange section comprises a heat insulation structure and a heat exchange tube disposed within the heat insulation structure.
5. The waste heat recovery system of claim 4, wherein the heat exchange tube is a tube or a light pipe with an outer flared structure.
6. The waste heat recovery system of claim 1, wherein the gas-liquid heat exchanger is an economizer and the gas-liquid heat exchange section is an economizer section.
7. A waste heat recovery system according to claim 1, characterized in that the air heat exchange unit (13) is a gas-liquid heat exchanger.
8. The waste heat recovery system according to claim 1, wherein a boiler drum is arranged in the feed water pipeline (21) between the secondary flue gas heat exchange unit (12) and the tube heating furnace (2).
9. A deep energy-saving waste heat recovery method for a tubular heating furnace is characterized by comprising the following steps:
introducing boiler feed water and tubular heating furnace flue gas into a gas-liquid heat exchange device for primary heat exchange;
introducing air and the boiler feed water subjected to the first heat exchange into a gas-liquid heat exchange device for second heat exchange;
introducing the boiler feed water subjected to the second heat exchange and the flue gas subjected to the first heat exchange into a gas-liquid heat exchange device for third heat exchange;
and introducing the air subjected to the second heat exchange into the tubular heating furnace to be used as combustion-supporting air.
10. The method of recovering waste heat according to claim 9, wherein:
and discharging the flue gas subjected to the third heat exchange from a chimney, and introducing the boiler feed water subjected to the third heat exchange into a steam-water system of the tubular heating furnace through a boiler steam drum.
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| CN201911029198.5A CN110762512B (en) | 2019-10-28 | 2019-10-28 | Deep energy-saving waste heat recovery system and method for tubular heating furnace |
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| CN201911029198.5A CN110762512B (en) | 2019-10-28 | 2019-10-28 | Deep energy-saving waste heat recovery system and method for tubular heating furnace |
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| CN110762512A true CN110762512A (en) | 2020-02-07 |
| CN110762512B CN110762512B (en) | 2021-08-06 |
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| CN208186400U (en) * | 2017-12-12 | 2018-12-04 | 埃尔微尘科技（北京）有限公司 | A kind of flue gas waste heat recovery and purification system |
| CN109915845A (en) * | 2017-12-12 | 2019-06-21 | 埃尔微尘科技（北京）有限公司 | A kind of flue gas waste heat recovery and purification system |
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2019
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201582842U (en) * | 2009-11-17 | 2010-09-15 | 中国石油化工集团公司 | Combined air preheater |
| CN104329684A (en) * | 2013-07-22 | 2015-02-04 | 中石化洛阳工程有限公司 | Method and device for reducing exhaust gas temperature |
| CN103438427A (en) * | 2013-08-09 | 2013-12-11 | 天津诺能达能源科技有限公司 | Gas-fired boiler afterheat recovering system and recovering method |
| CN106197049A (en) * | 2016-08-31 | 2016-12-07 | 上海浩用节能工程有限公司 | A kind of waste heat recovery system of pipe heater and method |
| CN206310470U (en) * | 2016-11-22 | 2017-07-07 | 中国石油天然气集团公司 | The split type economizer waste-heat recovery device of high/low temperature |
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Denomination of invention: Deep energy-saving waste heat recovery system and waste heat recovery method for tubular heating furnace Effective date of registration: 20230918 Granted publication date: 20210806 Pledgee: China Co. truction Bank Corp Shanghai Minhang branch Pledgor: SHANGHAI XTEK FURNACE CO.,LTD. Registration number: Y2023310000559 |
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