CN111288480A - Waste heat recovery system of phase change heat exchanger in thermal power generation enterprise - Google Patents
Waste heat recovery system of phase change heat exchanger in thermal power generation enterprise Download PDFInfo
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- CN111288480A CN111288480A CN201811501942.2A CN201811501942A CN111288480A CN 111288480 A CN111288480 A CN 111288480A CN 201811501942 A CN201811501942 A CN 201811501942A CN 111288480 A CN111288480 A CN 111288480A
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- Prior art keywords
- heat exchanger
- air
- change heat
- phase
- waste heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
- F23L15/04—Arrangements of recuperators
- F23L15/045—Arrangements of recuperators using intermediate heat-transfer fluids
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- 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
- F28D21/001—Recuperative heat exchangers the heat being recuperated from exhaust gases for thermal power plants or industrial processes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/20—Sulfur; Compounds thereof
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Supply (AREA)
Abstract
The invention belongs to the technical field of thermal power waste heat recovery, and particularly relates to a waste heat recovery system of a phase change heat exchanger in a thermal power enterprise, wherein the waste heat recovery system comprises an air preheater, a dust remover, an induced draft fan, a desulfurizing tower and a warm air blower, the air preheater, the dust remover, the induced draft fan and the desulfurizing tower are sequentially communicated through a pipeline, an air outlet of a warm air blower is communicated with an air inlet of the air preheater, an air outlet of the air preheater is connected with a flue gas cooler through a pipeline, an air outlet of the flue gas cooler is communicated with an air inlet of the dust remover, and an air outlet of the desulfurizing tower is provided with a; the waste heat recovery system can effectively reduce pollution emission, can also increase the heat exchanger behind desulfurization on the heat supply secondary water return side or the condensed water side to play a good energy recovery effect, can further utilize waste heat to heat cold air only from a boiler, improves the smoke temperature at the outlet of the air preheater, and greatly improves the utilization efficiency of thermal power generation energy.
Description
Technical Field
The invention belongs to the technical field of thermal power waste heat recovery, and particularly relates to a waste heat recovery system of a phase change heat exchanger in a thermal power enterprise.
Background
Thermal power enterprises use heat generated by coal combustion to heat boiler feed water to generate high-temperature and high-pressure steam, and the steam pushes a steam turbine to be brought to a generator to generate power. The whole process is an energy conversion process, and the coal releases heat energy to be converted into electric energy, wherein the conversion efficiency of the heat energy restricts the economical efficiency of thermal power generation enterprises, and especially the exhaust heat loss of a steam turbine and the exhaust smoke loss of a boiler account for a great weight.
In the thermal power factory, because do not have a waste heat recovery system, general hot flue gas directly passes through dust remover, desulfurizing tower from the hot flue gas of air preheater export and directly discharges through the chimney, produces huge waste, greatly reduced the utilization ratio of the energy.
Disclosure of Invention
The invention aims to provide a waste heat recovery system of a phase change heat exchanger in a thermal power generation enterprise, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a phase change heat exchanger is at waste heat recovery system of thermal power enterprise, waste heat recovery system includes air preheater, dust remover, draught fan, desulfurizing tower and air heater, air preheater, dust remover, draught fan and desulfurizing tower loop through the pipeline intercommunication, the air outlet of air heater with the air intake intercommunication of air preheater, the air outlet department of air preheater has flue gas cooler through the pipe connection, flue gas cooler's air outlet with the air intake intercommunication of dust remover, the air outlet of desulfurizing tower is provided with the flue gas reheater.
Preferably, the flue gas reheater is connected with the flue gas cooler through a pipeline.
Preferably, the waste heat recovery system comprises a phase-change heat exchanger a and a phase-change heat exchanger b, and the phase-change heat exchanger a and the phase-change heat exchanger b are respectively arranged at the air outlet of the induced draft fan and the air outlet of the phase-change heat exchanger b.
Preferably, an air outlet of the phase change heat exchanger b is communicated with an air inlet of the phase change heat exchanger a, an air outlet of the phase change heat exchanger a is communicated with an air inlet of the warm air blower, and an air outlet of the warm air blower is communicated with an air inlet of the phase change heat exchanger b.
Preferably, a supercharger is arranged between the air outlet of the phase-change heat exchanger a and the air inlet of the fan heater.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the phase-change heat exchanger, a flue gas cooler and a flue gas reheater are respectively added to an outlet of an air preheater and an outlet of a desulfurization tower in a waste heat recovery system of a thermal power generation enterprise, the flue gas heat at the outlet of the air preheater is fully utilized to heat the clean flue gas at the outlet of the desulfurization tower, the pollution emission can be reduced, and the heat exchanger after desulfurization can be added to a heat supply secondary water return side or a condensate side to achieve a good energy recovery effect;
2. the phase-change heat exchanger is characterized in that on the basis that a flue gas cooler and a flue gas reheater are respectively added to an air preheater outlet and a desulfurization tower outlet of a waste heat recovery system of a thermal power enterprise, a phase-change heat exchanger is respectively added to an induced draft fan outlet and a desulfurization tower outlet, waste heat is further utilized to heat cold air entering a boiler, and the temperature of the flue gas at the air preheater outlet is increased.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is another schematic structural view of the present invention;
in the figure: 1. an air preheater; 2. a flue gas cooler; 3. a dust remover; 4. an induced draft fan; 5. a desulfurizing tower; 6. a flue gas reheater; 7. a warm air blower; 8. a phase change heat exchanger a; 9. a phase change heat exchanger b; 10. a supercharger.
Detailed Description
The present invention will be further described with reference to the following examples.
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention. The conditions in the embodiments can be further adjusted according to specific conditions, and simple modifications of the method of the present invention based on the concept of the present invention are within the scope of the claimed invention.
Referring to fig. 1-2, the present invention provides a technical solution: a waste heat recovery system of a phase change heat exchanger in a thermal power enterprise comprises an air preheater 1, a dust remover 3, an induced draft fan 4, a desulfurizing tower 5 and a warm air blower 7, wherein the air preheater 1, the dust remover 3, the induced draft fan 4 and the desulfurizing tower 5 are sequentially communicated through pipelines, an air outlet of the warm air blower 7 is communicated with an air inlet of the air preheater 1, an air outlet of the air preheater 1 is connected with a flue gas cooler 2 through a pipeline, an air outlet of the flue gas cooler 2 is communicated with an air inlet of the dust remover 3, an air outlet of the desulfurizing tower 5 is provided with a flue gas reheater 6, the flue gas reheater 6 is connected with the flue gas cooler 2 through a pipeline, a flue gas cooler 2 and a flue gas reheater 6 are respectively added at an outlet of the air preheater 1 and an outlet of the desulfurizing tower 5, the flue gas heat at the outlet of the air preheater 1 is fully utilized to heat the clean flue gas at the outlet of the, the flue gas reheater 6 after desulfurization can be added on the heat supply secondary water return side or the condensed water side to achieve a good energy recovery effect, the waste heat recovery system comprises a phase change heat exchanger a8 and a phase change heat exchanger b9, the phase change heat exchanger a8 and the phase change heat exchanger b9 are respectively arranged at the air outlet of the induced draft fan 4 and the air outlet of the phase change heat exchanger b9, the air outlet of the phase change heat exchanger b9 is communicated with the air inlet of the phase change heat exchanger a8, the air outlet of the phase change heat exchanger a8 is communicated with the air inlet of the warm air blower 7, the air outlet of the warm air blower 7 is communicated with the air inlet of the phase change heat exchanger b9, and a supercharger 10 is arranged between the air outlet of the phase change heat exchanger a 36, a phase-change heat exchanger is respectively added at the outlet of the induced draft fan 4 and the outlet of the desulfurizing tower 5, and the waste heat is further utilized to heat cold air entering a boiler, so that the smoke temperature at the outlet of the air preheater 1 is increased.
The working principle and the using process of the invention are as follows: when in work, the induced draft fan 4 pumps hot flue gas from the economizer into the air preheater 1, and the hot flue gas enters the dust remover 3 through a pipeline for dust removal, the flue gas enters a desulfurizing tower 5 through a draught fan 4 for desulfurization, a flue gas cooler 2 and a flue gas reheater 6 are respectively added at the outlet of an air preheater 1 and the outlet of the desulfurizing tower 5, the heat of the flue gas at the outlet of the air preheater 1 is fully utilized to heat the clean flue gas at the outlet of the desulfurizing tower 5, can reduce the emission of pollution, can also increase the flue gas reheater 6 after desulfurization on the return water side or the condensed water side of the secondary heat supply water to achieve good energy recovery effect, meanwhile, a phase-change heat exchanger is respectively added at the outlet of the draught fan 4 and the outlet of the desulfurizing tower 5, waste heat is further utilized to heat cold air entering the boiler, the smoke temperature at the outlet of the air preheater 1 is increased, the waste heat utilization rate of thermal power generation is further improved, and the economic benefit of the thermal power generation is improved.
Case (2):
taking a 600MW thermal power generating unit as an example, the basic conditions of the unit are as follows:
table one: basic parameters of the unit
| Item | Unit of | THA | 75％THA | 50％THA |
| Main steam flow | t/h | 1795.38 | 1351.51 | 876.26 |
| Temperature of main steam | ℃ | 605 | 605 | 605 |
| Pressure of main steam | MPa | 27.98 | 21.23 | 14.05 |
| Temperature of feed water | ℃ | 302 | 302 | 276 |
| Reheat steam temperature | ℃ | 623 | 623 | 623 |
| Reheat steam pressure | MPa | 5.21 | 3.84 | 2.59 |
| Ambient temperature | ℃ | 20 | 20 | 20 |
| Exhaust gas temperature | ℃ | 119.5 | 117 | 113.5 |
| Condenser backpressure | kPa | 4.7 | 4.7 | 4.7 |
Table two: energy saving (THA) calculation summary for different waste heat utilization systems
Description of the drawings: the energy saving amounts are theoretical calculation data.
Table three: typical Low-provincial System energy saving calculation result summarization
Taking a table two 600MW unit as an example, the standard coal amount saved each year is calculated according to 5000 hours of annual operation:
standard coal with Q being 1.68X 5000X 600 5040 tons
Taking a table three 300MW unit as an example, the standard coal amount saved each year is calculated according to 5000 hours of annual operation:
standard coal with Q2.70X 5000X 300 4050 ton
By 6 months in 2018, 80 machines are temporarily arranged in the whole country at 600MW or more, 100 machines are temporarily arranged between 300MW and 600MW, 445320 tons of standard coal are saved in the calculation year, and 267192000 yuan can be saved in each ton of standard coal calculated according to 600 yuan.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The utility model provides a phase change heat exchanger is at waste heat recovery system of thermal power enterprise which characterized in that: waste heat recovery system includes air preheater (1), dust remover (3), draught fan (4), desulfurizing tower (5) and warm braw machine (7), air preheater (1), dust remover (3), draught fan (4) and desulfurizing tower (5) loop through the pipeline intercommunication, the air outlet of electric fan heater (7) with the air intake intercommunication of air preheater (1), the air outlet department of air preheater (1) has flue gas cooler (2) through the pipe connection, the air outlet of flue gas cooler (2) with the air intake intercommunication of dust remover (3), the air outlet of desulfurizing tower (5) is provided with flue gas reheater (6).
2. The system for recovering waste heat of a thermal power generation enterprise by using a phase change heat exchanger as claimed in claim 1, wherein: the flue gas reheater (6) is connected with the flue gas cooler (2) through a pipeline.
3. The system for recovering waste heat of a thermal power generation enterprise by using a phase change heat exchanger as claimed in claim 2, wherein: the waste heat recovery system comprises a phase-change heat exchanger a (8) and a phase-change heat exchanger b (9), wherein the phase-change heat exchanger a (8) and the phase-change heat exchanger b (9) are respectively arranged at the air outlet of the induced draft fan (4) and the air outlet of the phase-change heat exchanger b (9).
4. The system for recovering waste heat of a thermal power generation enterprise by using a phase change heat exchanger as claimed in claim 3, wherein: the air outlet of the phase-change heat exchanger b (9) is communicated with the air inlet of the phase-change heat exchanger a (8), the air outlet of the phase-change heat exchanger a (8) is communicated with the air inlet of the warm air blower (7), and the air outlet of the warm air blower (7) is communicated with the air inlet of the phase-change heat exchanger b (9).
5. The system for recovering waste heat of a thermal power generation enterprise by using a phase change heat exchanger as claimed in claim 4, wherein: a supercharger (10) is arranged between the air outlet of the phase-change heat exchanger a (8) and the air inlet of the fan heater (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811501942.2A CN111288480A (en) | 2018-12-10 | 2018-12-10 | Waste heat recovery system of phase change heat exchanger in thermal power generation enterprise |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811501942.2A CN111288480A (en) | 2018-12-10 | 2018-12-10 | Waste heat recovery system of phase change heat exchanger in thermal power generation enterprise |
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| Publication Number | Publication Date |
|---|---|
| CN111288480A true CN111288480A (en) | 2020-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811501942.2A Withdrawn CN111288480A (en) | 2018-12-10 | 2018-12-10 | Waste heat recovery system of phase change heat exchanger in thermal power generation enterprise |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115301062A (en) * | 2022-09-13 | 2022-11-08 | 重庆市渝江机械设备有限公司 | Desulfurization treatment system with pretreatment structure |
-
2018
- 2018-12-10 CN CN201811501942.2A patent/CN111288480A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115301062A (en) * | 2022-09-13 | 2022-11-08 | 重庆市渝江机械设备有限公司 | Desulfurization treatment system with pretreatment structure |
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Application publication date: 20200616 |