CN113606969B - Controllable double-phase heat medium forced circulation heat exchange system - Google Patents
Controllable double-phase heat medium forced circulation heat exchange system Download PDFInfo
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- CN113606969B CN113606969B CN202110695393.2A CN202110695393A CN113606969B CN 113606969 B CN113606969 B CN 113606969B CN 202110695393 A CN202110695393 A CN 202110695393A CN 113606969 B CN113606969 B CN 113606969B
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- 238000010521 absorption reaction Methods 0.000 claims abstract description 49
- 239000000428 dust Substances 0.000 claims abstract description 16
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 7
- 230000023556 desulfurization Effects 0.000 claims abstract description 7
- 238000000926 separation method Methods 0.000 claims description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 239000002253 acid Substances 0.000 claims description 12
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 abstract description 7
- 238000005260 corrosion Methods 0.000 abstract description 5
- 230000007797 corrosion Effects 0.000 abstract description 5
- 239000002918 waste heat Substances 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 abstract description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 18
- 239000003546 flue gas Substances 0.000 description 18
- 230000003009 desulfurizing effect Effects 0.000 description 9
- 230000008859 change Effects 0.000 description 4
- 238000009833 condensation Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/0266—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with separate evaporating and condensing chambers connected by at least one conduit; Loop-type heat pipes; with multiple or common evaporating or condensing chambers
-
- 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
- F23L15/04—Arrangements of recuperators
-
- 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
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/025—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes having non-capillary condensate return means
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Supply (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention provides a controllable double-phase heating medium forced circulation heat exchange system, which comprises a boiler system and a heat exchange system, wherein the boiler system comprises a boiler air preheater, an outlet pipeline of the boiler air preheater is connected with a boiler dust remover, a pipeline of the boiler dust remover is connected with a boiler induced draft fan, the pipeline of the boiler induced draft fan is connected with a boiler desulfurization tower, the pipeline of the boiler desulfurization tower is connected with a chimney, the heat exchange system comprises a heat absorption section and a heat release section, the heat release section is arranged on a pipeline between the boiler desulfurization tower and the chimney, and the heat absorption section is arranged on a pipeline between the boiler air preheater and the boiler dust remover. On the premise of ensuring that the heat exchanger is not affected by low-temperature corrosion, the service life of the device is prolonged, the running cost is reduced, and the economic benefit and feasibility of the waste heat recovery project are greatly improved.
Description
Technical Field
The invention relates to the technical field of boilers, in particular to a controllable double-phase heat medium forced circulation heat exchange system.
Background
In boiler systems in industries such as electric power, petroleum, chemical industry and the like, the exhaust gas temperature is higher generally, the heat energy waste is serious, and a heat exchanger can be arranged on a flue of an air preheater outlet to recycle the heat in the flue gas for heating the wet flue gas of the desulfurizing tower outlet, so that the problem of white smoke generated by a chimney is solved, and the purposes of energy conservation and environmental protection are achieved. Because the conventional heat exchanger uses water as a heat transfer circulating medium, the circulating flow is large, the distance between the wet flue at the outlet of the desulfurizing tower and the flue at the outlet of the air preheater is long, the power consumption of the circulating water pump is large, and the running cost is high; and the acid dew points of the hot flue gas and the wet flue gas are higher without an effective control means, when the external conditions change to cause the wall temperature of the heat exchanger to be lower than the acid dew point, the system cannot be adjusted in time, low-temperature corrosion can occur, and the service life of the heat exchanger is seriously influenced.
Disclosure of Invention
Aiming at the problems pointed out in the background technology, the invention provides a controllable double-phase heat medium forced circulation heat exchange system.
The technical scheme of the invention is realized as follows:
the utility model provides a controllable diphase heat medium forced circulation heat transfer system, includes boiler system and heat transfer system, its characterized in that: the boiler system comprises a boiler air preheater, an outlet pipeline of the boiler air preheater is connected with a boiler dust remover, a pipeline of the boiler dust remover is connected with a boiler induced draft fan, the pipeline of the boiler induced draft fan is connected with a boiler desulfurizing tower, the pipeline of the boiler desulfurizing tower is connected with a chimney, the heat exchange system comprises a heat absorption section and a heat release section, the heat release section is arranged on a pipeline between the boiler desulfurizing tower and the chimney, and the heat absorption section is arranged on the pipeline between the boiler air preheater and the boiler dust remover.
The invention is further provided with: an acid dew point on-line detector is arranged on a pipeline between the boiler dust remover and the boiler induced draft fan.
The invention is further provided with: the heat exchange system comprises a preheater and a steam-water separation tank, the steam-water separation tank comprises a first separation tank inlet, a first separation tank outlet, a second separation tank inlet and a second separation tank outlet, the heat release section comprises a heat release inlet and a heat release outlet, the first separation tank outlet is connected with a heat release inlet pipeline, the heat release outlet is connected with a second separation tank inlet pipeline, the preheater comprises a first preheater inlet, a first preheater outlet, a second preheater inlet and a second preheater outlet, the heat absorption section comprises a heat absorption inlet and a heat absorption outlet, the first preheater outlet is connected with a heat absorption inlet pipeline, the heat absorption outlet is connected with a second preheater inlet pipeline, the first preheater inlet is connected with a second separation tank outlet pipeline, a circulating water pump is arranged on the two pipelines, and the second preheater outlet is connected with the first separation tank inlet pipeline.
The invention is further provided with: and a pressure sensor and a steam regulating valve are arranged on a pipeline between the heat absorption outlet and the second inlet of the preheater.
In summary, the beneficial effects of the invention are as follows: according to the controllable double-phase heating medium forced circulation heat exchange system provided by the invention, the heat absorption section arranged on the hot flue gas side and the heat release section arranged on the wet flue gas side are independent heat exchange surfaces, so that the wall temperature of the heat absorption section is not influenced by the temperature change of a heating medium of the heat release section; the steam pipeline of the heat absorption outlet of the heat absorption section is provided with a regulating valve, and the pressure of the heat absorption section is controlled by the regulating valve, so that the aim of controlling the temperature of the biphase heating medium in the heat absorption section and finally controlling the temperature of the wall surface of the heat absorption section is fulfilled; an acid dew point online monitor is arranged to monitor the change of the acid dew point of the flue gas in real time, and the temperature is converted into steam saturation pressure to correct a control value, so that the problem of acid dew corrosion caused by uncontrollable factors that the acid dew point of the flue gas is higher than the actual wall temperature when the actual fuel components deviate from the design value too much is avoided; a preheater is added at the heat absorption inlet of the heat absorption section, steam at the heat absorption outlet is utilized to preheat the inlet water, and local low-temperature corrosion of a heating surface of the heat absorption section close to the inlet water side caused by too low condensation water temperature of the heat absorption section can be avoided; on the premise of ensuring that the heat exchanger is not affected by low-temperature corrosion, the service life of the device is prolonged, the running cost is reduced, and the economic benefit and feasibility of the waste heat recovery project are greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic diagram of the present invention.
Reference numerals: 1. a boiler air preheater; 2. a boiler dust remover; 3. a boiler induced draft fan; 4. a boiler desulfurizing tower; 5. a chimney; 6. a heat absorbing section; 7. an exothermic section; 8. an acid dew point on-line detector; 9. a preheater; 10. a steam-water separation tank; 11. a first inlet of the separator tank; 12. a first outlet of the separator tank; 13. a second inlet of the separator tank; 14. a second outlet of the separator tank; 15. a heat release inlet; 16. a heat release outlet; 17. a preheater first inlet; 18. a preheater first outlet; 19. a preheater second inlet; 20. a preheater second outlet; 21. a heat absorption inlet; 22. a heat absorbing outlet; 23. a circulating water pump; 24. a pressure sensor; 25. a steam regulating valve.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention is illustrated below with reference to fig. 1:
the utility model provides a controllable diphase heat medium forced circulation heat transfer system, includes boiler system and heat transfer system, and boiler system includes boiler air preheater 1, and boiler air preheater 1 outlet pipe way connection boiler dust remover 2, boiler dust remover 2 pipe connection boiler draught fan 3, boiler draught fan 3 pipe connection boiler desulfurizing tower 4, boiler desulfurizing tower 4 pipe connection chimney 5. The heat exchange system is added on the boiler system, so that the waste heat of the boiler system is fully utilized, and the purposes of energy conservation and environmental protection are achieved.
The heat exchange system comprises a heat absorption section 6, a preheater 9, a steam-water separation tank 10 and a heat release section 7 which are connected, wherein the steam-water separation tank 10 comprises a separation tank first inlet 11, a separation tank first outlet 12, a separation tank second inlet 13 and a separation tank second outlet 14, the heat release section 7 comprises a heat release inlet 15 and a heat release outlet 16, the separation tank first outlet 12 is connected with the heat release inlet 15 through a pipeline, the heat release outlet 16 is connected with the separation tank second inlet 13 through a pipeline, the preheater 9 comprises a preheater first inlet 17, a preheater first outlet 18, a preheater second inlet 19 and a preheater second outlet 20, the heat absorption section 6 comprises a heat absorption inlet 21 and a heat absorption outlet 22, the preheater first outlet 18 is connected with the heat absorption inlet 21 through a pipeline, the heat absorption outlet 22 is connected with the preheater second inlet 19 through a pipeline, the preheater first inlet 17 is connected with the separation tank second outlet 14 through a pipeline, a circulating water pump 23 is arranged on the two pipelines, and the preheater second outlet 20 is connected with the separation tank first inlet 11 through a pipeline. Wherein the heat release section 7 is arranged on a pipeline between the boiler desulfurization tower 4 and the chimney 5, the heat absorption section 6 is arranged on a pipeline between the boiler air preheater 1 and the boiler dust remover 2, and the heat absorption section 6 arranged on the hot flue gas side and the heat release section 7 arranged on the wet flue gas side are independent heat exchange surfaces, so that the wall temperature of the heat absorption section 6 is not influenced by the temperature change of a heating medium of the heat release section 7.
Further, a pressure sensor 24 and a steam regulating valve 25 are arranged on a pipeline between the heat absorption outlet 22 and the second inlet 19 of the preheater, the automatic control system takes the pressure measured by the pressure sensor 24 as a control target, and the opening of the steam regulating valve 25 is regulated to control, so that the pressure of the heat absorption section 6 is always near a set value.
Further, an acid dew point on-line detector 8 is arranged on a pipeline between the boiler dust remover 2 and the boiler induced draft fan 3, changes of the acid dew point of the flue gas are monitored in real time, and the pressure set value is corrected, so that the wall temperature of the heat absorption section 6 is always higher than the acid dew point.
The working process of the present invention will be further described below:
the temperature of the hot flue gas at the outlet of the boiler air preheater 1 is reduced after entering the heat absorption section 6 of the heat exchanger to exchange heat with the two-phase heat medium, and the two-phase heat medium in the heat absorption section 6 absorbs heat in the flue gas and then enters the preheater 9 through the heat absorption outlet 22 and the second inlet 19 of the preheater; then enters the steam-water separation tank 10 through the second outlet 20 of the preheater and the first inlet 11 of the separation tank; then enters the heat release section 7 through the first outlet 12 and the heat release inlet 15 of the separation tank; then enters the steam-water separation tank 10 through the heat release outlet 16 and the separation tank second inlet 13; then enters the preheater 9 through the second outlet 14 of the separating tank, the circulating water pump 23 and the first inlet 17 of the preheater; and then enters the heat absorption section 6 through the second outlet 20 and the heat absorption inlet 21 of the preheater, and the heat exchange is performed in a circulating and reciprocating mode.
In the steam-water separation tank 10, steam generated by separation enters the heat release section 7 to exchange heat with wet flue gas at the outlet of the desulfurizing tower to release heat and then returns to the steam-water separation tank 10, so that the aim of improving the temperature of the wet flue gas entering the chimney 5 is fulfilled; the condensed water separated by the steam-water separation tank 10 is pressurized by the circulating water pump 23, then enters the preheater 9 for preheating and then enters the heat absorption section 6 for continuously exchanging heat with hot flue gas, the double-phase heat medium is subjected to forced circulation of evaporation-condensation in the closed space, and is not in direct contact with the hot flue gas or wet flue gas, and only heat is transmitted.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the invention.
Claims (2)
1. The utility model provides a controllable diphase heat medium forced circulation heat transfer system, includes boiler system and heat transfer system, its characterized in that: the boiler system comprises a boiler air preheater (1), an outlet pipeline of the boiler air preheater (1) is connected with a boiler dust remover (2), the boiler dust remover (2) is connected with a boiler induced draft fan (3) through a pipeline, the boiler induced draft fan (3) is connected with a boiler desulfurization tower (4), the boiler desulfurization tower (4) is connected with a chimney (5) through a pipeline, the heat exchange system comprises a heat absorption section (6) and a heat release section (7), the heat release section (7) is arranged on a pipeline between the boiler desulfurization tower (4) and the chimney (5), the heat absorption section (6) is arranged on a pipeline between the boiler air preheater (1) and the boiler dust remover (2), and an acid dew point on-line detector (8) is arranged on a pipeline between the boiler dust remover (2) and the boiler induced draft fan (3);
the heat exchange system comprises a preheater (9) and a steam-water separation tank (10), the steam-water separation tank (10) comprises a first inlet (11) of the separation tank, a first outlet (12) of the separation tank, a second inlet (13) of the separation tank and a second outlet (14) of the separation tank, the heat release section (7) comprises a heat release inlet (15) and a heat release outlet (16), the first outlet (12) of the separation tank is connected with the heat release inlet (15) through a pipeline, the heat release outlet (16) is connected with the second inlet (13) of the separation tank through a pipeline, the preheater (9) comprises a first inlet (17) of the preheater, a first outlet (18) of the preheater, a second inlet (19) of the preheater and a second outlet (20) of the preheater, the heat absorption section (6) comprises a heat absorption inlet (21) and a heat absorption outlet (22), the first outlet (18) of the preheater is connected with the heat absorption inlet (21) through a pipeline, the heat absorption outlet (22) is connected with the second inlet (19) of the preheater through a pipeline, and the first inlet (17) of the preheater is connected with the second inlet (14) of the separation tank and the second inlet (23) through a water pump through a pipeline, and the second inlet (23) is connected with the second inlet (20) of the separator through a water pump.
2. The controllable two-phase heat medium forced circulation heat exchange system according to claim 1, wherein: a pressure sensor (24) and a steam regulating valve (25) are arranged on a pipeline between the heat absorption outlet (22) and the second inlet (19) of the preheater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110695393.2A CN113606969B (en) | 2021-06-23 | 2021-06-23 | Controllable double-phase heat medium forced circulation heat exchange system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110695393.2A CN113606969B (en) | 2021-06-23 | 2021-06-23 | Controllable double-phase heat medium forced circulation heat exchange system |
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| Publication Number | Publication Date |
|---|---|
| CN113606969A CN113606969A (en) | 2021-11-05 |
| CN113606969B true CN113606969B (en) | 2024-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110695393.2A Active CN113606969B (en) | 2021-06-23 | 2021-06-23 | Controllable double-phase heat medium forced circulation heat exchange system |
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|---|---|---|---|---|
| WO1983000380A1 (en) * | 1981-07-22 | 1983-02-03 | Okamoto, Eiji | Heat pipe heat exchanger |
| CN102012036A (en) * | 2010-11-02 | 2011-04-13 | 杨本洛 | Composite phase-transition heat exchanging device for warming clean gas fume and recovering exhaust heat after wet desulphurization |
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| CN204665333U (en) * | 2015-05-05 | 2015-09-23 | 中国能源建设集团广东省电力设计研究院有限公司 | Smoke waste heat utilization system |
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2021
- 2021-06-23 CN CN202110695393.2A patent/CN113606969B/en active Active
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| CN113606969A (en) | 2021-11-05 |
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