CN112856811A - Double-stage anti-freezing air heater system - Google Patents

Double-stage anti-freezing air heater system Download PDF

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Publication number
CN112856811A
CN112856811A CN202110114113.4A CN202110114113A CN112856811A CN 112856811 A CN112856811 A CN 112856811A CN 202110114113 A CN202110114113 A CN 202110114113A CN 112856811 A CN112856811 A CN 112856811A
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CN
China
Prior art keywords
heater
heat
air heater
freezing
liquid
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Application number
CN202110114113.4A
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Chinese (zh)
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CN112856811B (en
Inventor
李杨
井新经
周元祥
张奔
王勇
林琳
周刚
王宏武
王浩
马汀山
江浩
居文平
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Xian Thermal Power Research Institute Co Ltd
Xian Xire Energy Saving Technology Co Ltd
Original Assignee
Xian Thermal Power Research Institute Co Ltd
Xian Xire Energy Saving Technology Co Ltd
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Priority to CN202110114113.4A priority Critical patent/CN112856811B/en
Publication of CN112856811A publication Critical patent/CN112856811A/en
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Publication of CN112856811B publication Critical patent/CN112856811B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H3/00—Air heaters
    • F24H3/02—Air heaters with forced circulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/0052—Details for air heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/18—Arrangement or mounting of grates or heating means
    • F24H9/1854—Arrangement or mounting of grates or heating means for air heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2064—Arrangement or mounting of control or safety devices for air heaters
    • 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
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
    • F28D21/0005—Recuperative heat exchangers the heat being recuperated from exhaust gases for domestic or space-heating systems
    • F28D21/0008—Air heaters
    • 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 discloses a two-stage anti-freezing air heater system which comprises an air feeder, a first anti-freezing air heater, a first conventional air heater, an air preheater and a heat source system, wherein the air feeder is connected with the first conventional air heater; the outlet of the air feeder is communicated with the inlet of the air preheater through the heat absorption side of the first anti-freezing air heater and the heat absorption side of the first conventional air heater, the outlet of the primary air fan is communicated with the inlet of the air preheater through the heat absorption side of the second anti-freezing air heater and the heat absorption side of the second conventional air heater, the heat release side of the first anti-freezing air heater and the heat release side of the second anti-freezing air heater are both communicated with a heat source system, and the system can prevent the air heater from being frozen and cracked in extreme cold days and improve the operation safety of the air heater.

Description

Double-stage anti-freezing air heater system
Technical Field
The invention belongs to the field of energy conservation and environmental protection, and relates to a two-stage anti-freezing air heater system.
Background
In northern areas of China, particularly in inner Mongolia and extremely cold northeast areas, the condition of leakage and ash blockage of a heater of a coal-fired unit is serious under the condition that the heater always runs in a low-temperature environment, and the normal running of the unit is influenced. The main reasons are: (1) in extremely cold weather, because the temperature difference is large during the operation of the air heater, the thermal expansion amplitude among the tube rows of the air heater is large, and the air heater is difficult to absorb structurally, so that leakage accidents are caused; (2) the flow of the pipe bundle of the air heater is uneven, and the drainage in the drain pipe of the air heater is frozen, so that vicious circulation causes the frost crack of the pipe bundle of the air heater.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a two-stage anti-freezing fan heater system which can prevent a fan heater from being frozen and cracked in an extremely cold day and improve the operation safety of the fan heater.
In order to achieve the purpose, the double-stage anti-freezing air heater system comprises a blower, a first anti-freezing air heater, a first conventional air heater, an air preheater and a heat source system;
the outlet of the blower is communicated with the inlet of the air preheater through the heat absorption side of the first anti-freezing air heater and the heat absorption side of the first conventional air heater, the outlet of the primary air blower is communicated with the inlet of the air preheater through the heat absorption side of the second anti-freezing air heater and the heat absorption side of the second conventional air heater, and the heat release side of the first anti-freezing air heater and the heat release side of the second anti-freezing air heater are both communicated with a heat source system.
The heat source system comprises a liquid-liquid heat exchanger and a distributor, wherein a heat release side outlet of the first anti-freezing air heater and a heat release side outlet of the second anti-freezing air heater are communicated with a heat absorption side inlet of the liquid-liquid heat exchanger through pipelines and pipes, a heat absorption side outlet of the liquid-liquid heat exchanger is divided into two paths through the distributor, one path is communicated with a heat absorption side of the first anti-freezing air heater, and the other path is communicated with a heat absorption side of the second anti-freezing air heater.
The heat source system also comprises a No. 5 low-pressure heater and a No. 4 low-pressure heater, wherein the outlet of the No. 5 low-pressure heater is divided into two paths, one path is communicated with the inlet of the No. 4 low-pressure heater through the heat releasing side of the liquid-liquid heat exchanger, and the other path is communicated with the inlet of the No. 4 low-pressure heater.
A first regulating valve is arranged between the No. 5 low-pressure heater and the No. 4 low-pressure heater.
And a second regulating valve is arranged between the No. 5 low-pressure heater and the liquid-liquid heat exchanger.
The heat source system also comprises a water tank and a circulating water pump, wherein a heat release side outlet of the first anti-freezing air heater and a heat release side outlet of the second anti-freezing air heater are communicated with a heat absorption side of the liquid-liquid heat exchanger through the water tank and the circulating water pump in sequence after being connected in parallel through a pipeline.
A first valve is arranged between the distributor and the heat release side of the first anti-freezing air heater.
And a second valve is arranged between the distributor and the heat release side of the second anti-freezing air heater.
The invention has the following beneficial effects:
when the double-stage anti-freezing air heater system is in specific operation, the anti-freezing air heater is arranged in front of the conventional air heater, primary air and supplied air are heated by the anti-freezing air heater and then are fed into the conventional air heater, so that the temperature of wind in the conventional air heater is increased, the air heater is prevented from being frozen and cracked in extreme cold days, and the operation safety of the air heater is improved. In addition, a two-stage heat exchange mode is adopted, so that the temperature rise of each stage of air heater is reduced, the running temperature difference of the air heater is reduced, the thermal expansion amplitude among the tube rows of the air heater is reduced, and the leakage accident is avoided.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein 101 is a first anti-freezing air heater, 102 is a second anti-freezing air heater, 21 is a first conventional air heater, 22 is a second conventional air heater, 3 is a blower, 4 is a primary air fan, 5 is a water tank, 6 is a circulating water pump, 7 is a liquid-liquid heat exchanger, 8 is a distributor, 91 is a first valve, 92 is a second valve, 10 is a No. 5 low-pressure heater, 111 is a first regulating valve, 112 is a second regulating valve, 12 is a No. 4 low-pressure heater, and 13 is an air preheater.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the dual-stage anti-freezing air heater system according to the present invention includes a blower 3, a first anti-freezing air heater 101, a first conventional air heater 21, an air preheater 13 and a heat source system; the outlet of the blower 3 is communicated with the inlet of the air preheater 13 through the heat absorption side of the first anti-freezing air heater 101 and the heat absorption side of the first conventional air heater 21, the outlet of the primary air fan 4 is communicated with the inlet of the air preheater 13 through the heat absorption side of the second anti-freezing air heater 102 and the heat absorption side of the second conventional air heater 22, and the heat release side of the first anti-freezing air heater 101 and the heat release side of the second anti-freezing air heater 102 are both communicated with a heat source system.
The heat source system comprises a liquid-liquid heat exchanger 7 and a distributor 8, wherein a heat release side outlet of the first anti-freezing air heater 101 and a heat release side outlet of the second anti-freezing air heater 102 are communicated with a heat absorption side inlet of the liquid-liquid heat exchanger 7 through pipelines and pipes, a heat absorption side outlet of the liquid-liquid heat exchanger 7 is divided into two paths through the distributor 8, one path is communicated with a heat absorption side of the first anti-freezing air heater 101, and the other path is communicated with a heat absorption side of the second anti-freezing air heater 102.
Further, the heat source system also comprises a No. 5 low-pressure heater 10 and a No. 4 low-pressure heater 12, wherein the outlet of the No. 5 low-pressure heater 10 is divided into two paths, one path is communicated with the inlet of the No. 4 low-pressure heater 12 through the heat-releasing side of the liquid-liquid heat exchanger 7, and the other path is communicated with the inlet of the No. 4 low-pressure heater 12.
Wherein, a first regulating valve 111 is arranged between the No. 5 low-pressure heater 10 and the No. 4 low-pressure heater 12; a second regulating valve 112 is arranged between the No. 5 low-pressure heater 10 and the liquid-liquid heat exchanger 7.
Further, the heat source system further comprises a water tank 5 and a circulating water pump 6, wherein a heat release side outlet of the first anti-freezing air heater 101 and a heat release side outlet of the second anti-freezing air heater 102 are connected in parallel through a pipeline and then are communicated with a heat absorption side of the liquid-liquid heat exchanger 7 through the water tank 5 and the circulating water pump 6 in sequence.
Wherein, a first valve 91 is arranged between the distributor 8 and the heat release side of the first anti-freezing air heater 101; a second valve 92 is provided between the distributor 8 and the heat discharging side of the second anti-freeze heater 102.
The specific working process of the invention is as follows:
the air output by the blower 3 enters the heat absorption side of the first anti-freezing air heater 101 to absorb heat, and then enters the air preheater 13 after being absorbed by the first conventional air heater 21; the air output by the primary air fan 4 enters the heat absorption side of the second anti-freezing air heater 102 to absorb heat, and then enters the air preheater 13 after being absorbed by the second conventional air heater 22;
the liquid working medium output from the heat release side of the first anti-freezing air heater 101 and the liquid working medium output from the heat release side of the second anti-freezing air heater 102 converge and then enter the heat absorption side of the liquid-liquid heat exchanger 7 through the water tank 5 and the circulating water pump 6 to absorb heat, and then enter the distributor 8, wherein the liquid working medium output from the distributor 8 is divided into two paths, one path enters the heat release side of the first anti-freezing air heater 101 through the first valve 91, the other path enters the heat absorption side of the second anti-freezing air heater 102 through the second valve 92 to realize the circulation of the liquid working medium, the hot water output from the No. 5 low-pressure heater 10 is divided into two paths, one path enters the No. 4 low-pressure heater 12 through the first regulating valve 111, and the other path enters the heat release side of the liquid-liquid heat exchanger 7 through the second regulating valve 112 to release heat and then enters the No. 4 low.
It should be noted that the first anti-freezing air heater 101 and the second anti-freezing air heater 102 are utilized to increase the temperature of the primary air and the supplied air to 5 ℃, and then the first conventional air heater 21 and the second conventional air heater 22 are utilized to increase the temperature of the primary air and the supplied air to about 25 ℃.
In addition, the liquid working medium is antifreeze, and the main component of the antifreeze comprises but is not limited to calcium chloride (CaCl)2) Methanol (CH)3OH), ethanol (C)2H5OH, common name of alcohol), ethylene glycol (C)2H4(OH)2Glycerol (C)3H5(OH)3Glycerol), lubricating oil and the like, the antifreeze is used as a working medium of the anti-freezing air heater, so that freezing in a drain pipe of the air heater is avoided, freezing caused by uneven flow of a pipe bundle of the air heater is avoided, and the pipe bundle of the air heater is prevented from being frozen and cracked.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.

Claims (8)

1. A double-stage anti-freezing air heater system is characterized by comprising a blower (3), a first anti-freezing air heater (101), a first conventional air heater (21), an air preheater (13) and a heat source system;
an outlet of the blower (3) is communicated with an inlet of the air preheater (13) through a heat absorption side of the first anti-freezing air heater (101) and a heat absorption side of the first conventional air heater (21), an outlet of the primary fan (4) is communicated with an inlet of the air preheater (13) through a heat absorption side of the second anti-freezing air heater (102) and a heat absorption side of the second conventional air heater (22), and a heat release side of the first anti-freezing air heater (101) and a heat release side of the second anti-freezing air heater (102) are communicated with a heat source system.
2. The dual-stage anti-freezing fan heater system according to claim 1, wherein the heat source system comprises a liquid-liquid heat exchanger (7) and a distributor (8), wherein the heat-releasing side outlet of the first anti-freezing fan heater (101) and the heat-releasing side outlet of the second anti-freezing fan heater (102) are communicated with the heat-absorbing side inlet of the liquid-liquid heat exchanger (7) through pipelines and pipes, the heat-absorbing side outlet of the liquid-liquid heat exchanger (7) is divided into two paths through the distributor (8), one path is communicated with the heat-absorbing side of the first anti-freezing fan heater (101), and the other path is communicated with the heat-absorbing side of the second anti-freezing fan heater (102).
3. The dual-stage anti-freezing fan heater system according to claim 1, wherein the heat source system further comprises a No. 5 low-pressure heater (10) and a No. 4 low-pressure heater (12), wherein the outlet of the No. 5 low-pressure heater (10) is divided into two paths, one path is communicated with the inlet of the No. 4 low-pressure heater (12) through the heat releasing side of the liquid-liquid heat exchanger (7), and the other path is communicated with the inlet of the No. 4 low-pressure heater (12).
4. The dual-stage anti-freeze fan heater system according to claim 3, wherein a first regulating valve (111) is provided between the No. 5 low pressure heater (10) and the No. 4 low pressure heater (12).
5. The dual-stage anti-freezing fan heater system according to claim 3, characterized in that a second regulating valve (112) is arranged between the No. 5 low-pressure heater (10) and the liquid-liquid heat exchanger (7).
6. The dual-stage anti-freezing fan heater system according to claim 2, wherein the heat source system further comprises a water tank (5) and a circulating water pump (6), wherein the heat-releasing side outlet of the first anti-freezing fan heater (101) and the heat-releasing side outlet of the second anti-freezing fan heater (102) are connected in series through a pipeline and then communicated with the heat-absorbing side of the liquid-liquid heat exchanger (7) through the water tank (5) and the circulating water pump (6).
7. The dual stage anti-freeze heater system according to claim 2, wherein a first valve (91) is disposed between the distributor (8) and the heat emitting side of the first anti-freeze heater (101).
8. The dual stage anti-freeze heater system according to claim 7, wherein a second valve (92) is disposed between the distributor (8) and the heat rejection side of the second anti-freeze heater (102).
CN202110114113.4A 2021-01-27 2021-01-27 Double-stage anti-freezing air heater system Active CN112856811B (en)

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CN112856811A true CN112856811A (en) 2021-05-28
CN112856811B CN112856811B (en) 2023-04-07

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202660734U (en) * 2012-07-03 2013-01-09 天津新华能源设备科技有限公司 Mining heater unit
CN107816802A (en) * 2017-11-27 2018-03-20 大冶海通热工技术有限公司 A kind of heated air circulation type aerial cooler
CN208765037U (en) * 2018-09-17 2019-04-19 北京七杰科技有限公司 A kind of warm-air drier
CN210197331U (en) * 2019-05-31 2020-03-27 山东泓奥电力科技有限公司 Combined system for eliminating smoke plume and utilizing low-grade flue gas waste heat
CN211650196U (en) * 2020-02-12 2020-10-09 西安热工研究院有限公司 Steam-driven water-feeding pump small-machine exhaust waste heat recycling device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202660734U (en) * 2012-07-03 2013-01-09 天津新华能源设备科技有限公司 Mining heater unit
CN107816802A (en) * 2017-11-27 2018-03-20 大冶海通热工技术有限公司 A kind of heated air circulation type aerial cooler
CN208765037U (en) * 2018-09-17 2019-04-19 北京七杰科技有限公司 A kind of warm-air drier
CN210197331U (en) * 2019-05-31 2020-03-27 山东泓奥电力科技有限公司 Combined system for eliminating smoke plume and utilizing low-grade flue gas waste heat
CN211650196U (en) * 2020-02-12 2020-10-09 西安热工研究院有限公司 Steam-driven water-feeding pump small-machine exhaust waste heat recycling device

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