CN112283937A - Frost prevention system for water medium air heater and control method - Google Patents
Frost prevention system for water medium air heater and control method Download PDFInfo
- Publication number
- CN112283937A CN112283937A CN202011315573.5A CN202011315573A CN112283937A CN 112283937 A CN112283937 A CN 112283937A CN 202011315573 A CN202011315573 A CN 202011315573A CN 112283937 A CN112283937 A CN 112283937A
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- Prior art keywords
- air heater
- inlet
- air
- water
- bypass
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 7
- 230000002265 prevention Effects 0.000 title claims description 4
- 230000010148 water-pollination Effects 0.000 claims abstract description 29
- 238000007710 freezing Methods 0.000 claims abstract description 15
- 230000008014 freezing Effects 0.000 claims description 6
- 230000002528 anti-freeze Effects 0.000 claims 5
- 238000005336 cracking Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
Images
Classifications
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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
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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
-
- 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
-
- 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 hydrophily air heater anti-freezing system and a control method, which comprises an inlet pipeline, a hydrophily air heater, an outlet pipeline, a fan and an air preheater, wherein the inlet pipeline is connected with a water side inlet of the hydrophily air heater, and the outlet pipeline is connected with a water side outlet of the hydrophily air heater; a first bypass and a second bypass for enabling water in the water medium air heater to flow reversely are arranged between the inlet pipeline and the outlet pipeline. The hydrophily air heater has an anti-freezing function, is simple in system, and greatly improves the safety of the hydrophily air heater.
Description
Technical Field
The invention belongs to the technical field of boilers, and relates to a water medium air heater anti-freezing system and a control method.
Background
With the continuous promotion of the low-carbon environmental protection policy of China, after the coal-fired unit is subjected to ultralow emission, the air preheater is seriously blocked and corroded, the unit is high in operation energy consumption, and the water medium air heater can improve the comprehensive temperature of the cold end of the air preheater of the coal-fired boiler, relieve the blockage and corrosion of the air preheater, improve the boiler efficiency and be widely applied. Compared with a steam air heater, the water-borne air heater has the advantages of low energy consumption, simple system and the like, but is easier to freeze, particularly in northern areas, when the ambient temperature is lower than zero in winter, the water-borne air heater faces serious freezing risks, and cases that the water-borne air heater is frozen are rare. In order to avoid freezing, part of the hydrophily air heaters quit running, so that the comprehensive temperature of the cold end of the air preheater is too low in winter, the air preheater is seriously blocked with ash, the resistance is large, and even the load of a unit is influenced; and partial hydrophily air heaters adopt means such as steam preheating, hot air recirculation, indoor air intake and the like to improve the air temperature at the inlet of the hydrophily air heater, but all the means can cause the efficiency of the unit to be reduced, so the antifreezing technology of the hydrophily air heaters is widely concerned.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a hydrophily air heater anti-freezing system and a control method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a system for preventing freezing of a hydrophily air heater comprises an inlet pipeline, a hydrophily air heater, an outlet pipeline, a fan and an air preheater, wherein the inlet pipeline is connected with a water side inlet of the hydrophily air heater, and the outlet pipeline is connected with a water side outlet of the hydrophily air heater; a first bypass and a second bypass for enabling water in the water medium air heater to flow reversely are arranged between the inlet pipeline and the outlet pipeline.
The invention has the further improvement that the system also comprises a fan and an air preheater, wherein the fan is connected with an air side inlet of the water medium air heater, and the air preheater is connected with an air side outlet of the water medium air heater.
The invention has the further improvement that a wind temperature measuring point is arranged on a pipeline between the fan and the air side inlet of the water medium air heater.
The invention is further improved in that the inlet pipeline is provided with an inlet shutoff valve, and the outlet pipeline is provided with an outlet shutoff valve.
The invention is further improved in that one end of the first bypass is communicated with an inlet pipeline in front of the inlet shutoff valve, and the other end of the first bypass is communicated with an outlet pipeline between the water medium air heater and the outlet shutoff valve.
The invention is further improved in that the first bypass is provided with a first bypass valve and the second bypass is provided with a second bypass valve.
The invention is further improved in that one end of the second bypass is communicated with an inlet pipeline between the hydrophily air heater and the inlet shutoff valve, and the other end of the second bypass is communicated with an outlet pipeline behind the outlet shutoff valve.
The invention has the further improvement that when the inlet air temperature of the air side of the water medium air heater is higher than 0 ℃, the inlet shutoff valve and the outlet shutoff valve are opened, and the first bypass valve and the second bypass valve are closed; and when the air temperature of the inlet at the air side of the water medium air heater is lower than 0 ℃, closing the inlet shutoff valve and the outlet shutoff valve, and opening the first bypass valve and the second bypass valve.
When the inlet air temperature of the air side of the water medium air heater is higher than 0 ℃, opening an inlet shutoff valve and an outlet shutoff valve, and closing a first bypass valve and a second bypass valve; and when the air temperature of the inlet at the air side of the water medium air heater is lower than 0 ℃, closing the inlet shutoff valve and the outlet shutoff valve, and opening the first bypass valve and the second bypass valve.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the first bypass and the second bypass which are used for enabling water in the hydrophily air heater to flow reversely are arranged between the inlet pipeline and the outlet pipeline, the operation mode is switched according to the environment temperature, the hydrophily air heater does not need to operate according to the reverse flow when in antifreezing, the outlet air temperature is greatly improved, the hydrophily air heater of the hydrophily air heater operates according to the downstream flow when in antifreezing, the wall temperature of the heat exchange tube bundle is integrally improved, and the hydrophily air heater is prevented from being frozen.
When the device is applied, when the measured value of the wind temperature measuring point is higher than that, the hydrophily air heater operates according to the countercurrent, namely, the inlet shutoff valve and the outlet shutoff valve are opened, the first bypass valve and the second bypass valve are closed, the heat exchange temperature difference of the hydrophily air heater is large, and the wind temperature at the outlet of the hydrophily air heater is greatly improved; when the measured value of the air temperature measuring point is lower than the measured value, the water medium air heater operates according to the downstream flow, namely, the inlet shutoff valve and the outlet shutoff valve are closed, the first bypass valve and the second bypass valve are opened, the wall temperature of the heat exchange tube bundle at the inlet of the water medium air heater is increased, and frost cracking is prevented. The water medium air heater has an anti-freezing function, and the safety is greatly improved.
Drawings
FIG. 1 is a schematic view of the system for operating a water-borne air heater according to the present invention at an inlet air temperature higher than 0 ℃;
fig. 2 is a schematic view of an operation system of the water-borne air heater of the invention when the inlet air temperature is lower than 0 ℃.
Wherein, 1 is an inlet pipeline, 2 is an inlet shutoff valve, 3 is a water medium air heater, 4 is an outlet shutoff valve, 5 is an outlet pipeline, 6 is a first bypass, 7 is a first bypass valve, 8 is a second bypass, 9 is a second bypass valve, 10 is a fan, 11 is an air temperature measuring point, and 12 is an air preheater.
Detailed Description
The present invention is described in further detail below with reference to the attached drawings.
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
In addition, an element of the present invention may be said to be "fixed" or "disposed" to another element, either directly on the other element or with intervening elements present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Referring to fig. 1 and 2, the system for preventing freezing of the water medium air heater has a freezing prevention function, and comprises an inlet pipeline 1, an inlet shutoff valve 2, a water medium air heater 3, an outlet shutoff valve 4 and an outlet pipeline 5 which are sequentially communicated, and further comprises a first bypass 6, a first bypass valve 7, a second bypass 8 and a second bypass valve 9.
One end of the first bypass 6 is communicated with the inlet pipeline 1 in front of the inlet shutoff valve 2, and the other end of the first bypass is communicated with the outlet pipeline 5 between the water medium air heater 3 and the outlet shutoff valve 4; one end of the second bypass 8 is communicated with the inlet pipeline 1 between the hydrophily air heater 3 and the inlet shutoff valve 2, and the other end is communicated with the outlet pipeline 5 behind the outlet shutoff valve 4.
The air side inlet of the water medium air heater 3 is connected with a fan 10 and is provided with an air temperature measuring point 11, and the outlet is connected with an air preheater 12.
The control method of the anti-freezing system of the water-borne air heater comprises the following steps:
when the measured value of the air temperature measuring point 11 is higher than 0 ℃, the water medium air heater 3 runs in a countercurrent mode, namely the inlet shutoff valve 2 and the outlet shutoff valve 4 are opened, the first bypass valve 7 and the second bypass valve 9 are closed, the heat exchange temperature difference of the water medium air heater is large, and the air temperature at the outlet of the water medium air heater is greatly increased; when the measured value of the air temperature measuring point 11 is lower than 0 ℃, the water medium air heater 3 operates according to the concurrent flow, namely the inlet shutoff valve 2 and the outlet shutoff valve 4 are closed, the first bypass valve 7 and the second bypass valve 9 are opened, the wall temperature of the heat exchange tube bundle at the inlet of the water medium air heater is increased, and frost cracking is prevented. The system has the advantages of antifreezing function, simple system and great improvement on the safety of the water medium air heater.
The foregoing is merely illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the claims. The present invention is not limited to the above embodiments, and the specific structure thereof is allowed to vary. But all changes which come within the scope of the invention are intended to be embraced therein.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Claims (9)
1. A freezing prevention system of a hydrophily air heater is characterized by comprising an inlet pipeline (1), a hydrophily air heater (3), an outlet pipeline (5), a fan (10) and an air preheater (12), wherein the inlet pipeline (1) is connected with a water side inlet of the hydrophily air heater (3), and the outlet pipeline (5) is connected with a water side outlet of the hydrophily air heater (3); a first bypass (6) and a second bypass (8) which are used for enabling water in the water medium air heater (3) to flow reversely are arranged between the inlet pipeline (1) and the outlet pipeline (5).
2. The anti-freezing system of the waterborne air heater as claimed in claim 1, further comprising a fan (10) and an air preheater (12), wherein the fan (10) is connected to the air side inlet of the waterborne air heater (3), and the air preheater (12) is connected to the air side outlet of the waterborne air heater (3).
3. The anti-freezing system of the water-borne air heater as claimed in claim 2, wherein a wind temperature measuring point (11) is arranged on a pipeline between the fan (10) and the air side inlet of the water-borne air heater (3).
4. The antifreeze system for a water-borne air heater as claimed in claim 1, wherein the inlet pipe (1) is provided with an inlet shutoff valve (2), and the outlet pipe (5) is provided with an outlet shutoff valve (4).
5. The antifreeze system for the water-borne air heater as claimed in claim 4, wherein one end of the first bypass (6) is communicated with the inlet pipeline (1) in front of the inlet shutoff valve (2), and the other end is communicated with the outlet pipeline (5) between the water-borne air heater (3) and the outlet shutoff valve (4).
6. The antifreeze system for the water-borne air heater as claimed in claim 4, wherein a first bypass valve (7) is arranged on the first bypass (6), and a second bypass valve (9) is arranged on the second bypass (8).
7. The antifreeze system for a water-borne air heater as claimed in claim 4, wherein one end of the second bypass (8) is communicated with the inlet pipeline (1) between the water-borne air heater (3) and the inlet shutoff valve (2), and the other end is communicated with the outlet pipeline (5) behind the outlet shutoff valve (4).
8. The antifreeze system of the water heater as claimed in claim 4, wherein when the temperature of the inlet air at the air side of the water heater (3) is higher than 0 ℃, the inlet shutoff valve (2) and the outlet shutoff valve (4) are opened, and the first bypass valve (7) and the second bypass valve (9) are closed; when the air temperature of the air side of the water medium air heater (3) is lower than 0 ℃, the inlet shutoff valve (2) and the outlet shutoff valve (4) are closed, and the first bypass valve (7) and the second bypass valve (9) are opened.
9. A control method of the anti-freezing system of the water-borne air heater based on the claim 6 is characterized in that when the temperature of the inlet air at the air side of the water-borne air heater (3) is higher than 0 ℃, the inlet shutoff valve (2) and the outlet shutoff valve (4) are opened, and the first bypass valve (7) and the second bypass valve (9) are closed; when the air temperature of the air side of the water medium air heater (3) is lower than 0 ℃, the inlet shutoff valve (2) and the outlet shutoff valve (4) are closed, and the first bypass valve (7) and the second bypass valve (9) are opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011315573.5A CN112283937A (en) | 2020-11-21 | 2020-11-21 | Frost prevention system for water medium air heater and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011315573.5A CN112283937A (en) | 2020-11-21 | 2020-11-21 | Frost prevention system for water medium air heater and control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112283937A true CN112283937A (en) | 2021-01-29 |
Family
ID=74399657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011315573.5A Pending CN112283937A (en) | 2020-11-21 | 2020-11-21 | Frost prevention system for water medium air heater and control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112283937A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR200360511Y1 (en) * | 2004-05-27 | 2004-08-30 | 주식회사 경동보일러 | Hot water boiler having bypass circuit for preventing freeze-burst |
| CN202024625U (en) * | 2011-03-24 | 2011-11-02 | 双良节能系统股份有限公司 | Indirect air cooling system capable of changing flow direction of cooling water |
| CN106090988A (en) * | 2016-08-05 | 2016-11-09 | 宁波天净科环保科技有限公司 | A kind of anti-freeze type heat pipe wind-warming unit system |
| CN213811154U (en) * | 2020-11-21 | 2021-07-27 | 西安热工研究院有限公司 | Frost protection system for water medium air heater |
-
2020
- 2020-11-21 CN CN202011315573.5A patent/CN112283937A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR200360511Y1 (en) * | 2004-05-27 | 2004-08-30 | 주식회사 경동보일러 | Hot water boiler having bypass circuit for preventing freeze-burst |
| CN202024625U (en) * | 2011-03-24 | 2011-11-02 | 双良节能系统股份有限公司 | Indirect air cooling system capable of changing flow direction of cooling water |
| CN106090988A (en) * | 2016-08-05 | 2016-11-09 | 宁波天净科环保科技有限公司 | A kind of anti-freeze type heat pipe wind-warming unit system |
| CN213811154U (en) * | 2020-11-21 | 2021-07-27 | 西安热工研究院有限公司 | Frost protection system for water medium air heater |
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