CN111637433A - Flue gas waste heat recovery saturated steam flash evaporation power generation system - Google Patents
Flue gas waste heat recovery saturated steam flash evaporation power generation system Download PDFInfo
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- CN111637433A CN111637433A CN201910157095.0A CN201910157095A CN111637433A CN 111637433 A CN111637433 A CN 111637433A CN 201910157095 A CN201910157095 A CN 201910157095A CN 111637433 A CN111637433 A CN 111637433A
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- flue gas
- flash
- steam
- waste heat
- power generation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B3/00—Other methods of steam generation; Steam boilers not provided for in other groups of this subclass
- F22B3/04—Other methods of steam generation; Steam boilers not provided for in other groups of this subclass by drop in pressure of high-pressure hot water within pressure- reducing chambers, e.g. in accumulators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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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
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/10—Auxiliary systems, arrangements, or devices for extracting, cooling, and removing non-condensable gases
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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
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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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)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a flue gas waste heat recovery saturated steam flash evaporation power generation system, which comprises: flash vessel, steam turbine, condenser and gas heater, the flash vessel the steam turbine the condenser with gas heater connects gradually end to end, gas heater is suitable for the setting in the route of discharging fume of boiler to carry out the heat transfer of flue gas and condensate water. Therefore, the system can effectively reduce the exhaust gas temperature of the boiler and reduce heat loss on the one hand, and can reasonably utilize the exhaust gas temperature to increase the temperature of the condensed water on the other hand, so that the system can generate electricity, not only can save energy, but also can save the investment cost of projects.
Description
Technical Field
The invention relates to the technical field of waste heat power generation, in particular to a flue gas waste heat recovery saturated steam flash evaporation power generation system.
Background
At present, the total energy consumption of China is large, the pollutant emission is high, and the influence on global climate and environment is paid international social attention. Reducing the discharge of pollutants is a main way for treating the environmental pollution at present.
In the related art, the temperature of the flue gas from the stack is referred to as the flue gas temperature when the boiler is in operation. Flue gas temperature is 60 ℃ (electric power) -250 ℃ (steel/chemical/coking), and besides the heat loss of the flue gas of the boiler is increased, the efficiency of the boiler is reduced, and the method can also be used for the following equipment such as: the safe and economic operation of dust collectors, fans, desulfurization devices, etc. causes certain impact.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention aims to provide a flue gas waste heat recovery saturated steam flash evaporation power generation system, which can utilize flue gas waste heat to generate power, thereby reducing the heat loss of exhaust smoke, saving energy and being beneficial to environmental protection.
According to the embodiment of the invention, the flue gas waste heat recovery saturated steam flash evaporation power generation system comprises: flash vessel, steam turbine, condenser and gas heater, the flash vessel the steam turbine the condenser with gas heater connects gradually end to end, gas heater is suitable for the setting in the route of discharging fume of boiler, with gas heater department carries out the heat transfer of flue gas and condensate water.
According to the flue gas waste heat recovery saturated steam flash evaporation power generation system provided by the embodiment of the invention, on one hand, the flue gas temperature can be effectively reduced, the flue gas temperature is reduced to 60 ℃ by the flue gas heat exchanger, on the other hand, the flue gas temperature can be reasonably utilized to raise the temperature of condensed water, so that the system can generate power, the flue gas waste heat can be effectively recovered and used for generating power, the technical scope of energy conservation and comprehensive utilization of resources is met, energy can be saved, and the investment cost of engineering can be saved.
In some examples of the invention, the flash tank is at least two.
In some examples of the present invention, the flash tank includes two flash tanks, each of the two flash tanks includes a first flash tank and a second flash tank, each of the first flash tank and the second flash tank includes a condensed water inlet, a steam outlet, and a condensed water outlet, the steam outlet of the first flash tank and the steam outlet of the second flash tank are both connected to the steam turbine, the condensed water inlet of the first flash tank is connected to the flue gas heat exchanger, the condensed water outlet of the first flash tank is connected to the condensed water inlet of the second flash tank, and the condensed water outlet of the second flash tank is connected to the flue gas heat exchanger.
In some examples of the invention, the system further comprises: and the condensed water outlet of the secondary flash expansion tank and the condensed water outlet of the condenser are connected with the flue gas heat exchanger through the water mixer.
In some examples of the present invention, a steam inlet control valve is disposed between the steam outlet of the primary flash tank and the steam inlet of the steam turbine, and a steam supply control valve is disposed between the steam outlet of the secondary flash tank and the steam supply port of the steam turbine.
In some examples of the invention, the flue gas heat exchanger comprises a cold end heated wall corresponding to flue gas, and the cold end heated wall is ND steel plate wall, Corten steel plate wall or fluoroplastic plate wall.
In some examples of the invention, the system further comprises: and the vacuumizing equipment is connected with the condenser so as to extract non-condensable gas in the vacuumizing equipment.
In some examples of the invention, the evacuation apparatus comprises: the water jet pump is connected with the water jet air ejector, and the water jet air ejector is also connected with the condenser.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a flue gas waste heat recovery saturated steam flash power generation system according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a flue gas waste heat recovery saturated steam flash power generation system according to another embodiment of the invention.
Reference numerals:
the flue gas waste heat recovery saturated steam flash evaporation power generation system 100;
a boiler 1; a dust remover 2; a fan 3; a flue gas heat exchanger 4; a desulfurizer 5; a chimney 6;
a primary flash vessel 21; a secondary flash vessel 22; a steam turbine 23; a condenser 24; a water mixer 25; an admission control valve 26 and a steam compensation control valve 27.
Detailed Description
Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.
The flue gas waste heat recovery saturated steam flash evaporation power generation system 100 according to the embodiment of the invention is described below with reference to fig. 1 to fig. 2, and the flue gas waste heat recovery saturated steam flash evaporation power generation system 100 is implemented on the flue gas waste heat recovery system 10, which can reasonably utilize the flue gas of the flue gas waste heat recovery system 10 and can effectively reduce the temperature of the flue gas.
As shown in fig. 1 and fig. 2, the flue gas waste heat recovery system 10 includes: boiler 1, dust remover 2, fan 3 and desulphurization unit 5, boiler 1, dust remover 2, fan 3 and desulphurization unit 5 connect gradually, and this flue gas waste heat recovery system 10 still includes: a chimney 6, wherein the chimney 6 is used for discharging flue gas, and the chimney 6 is connected behind the desulphurization device 5. The desulfurization unit 5 may be a desulfurization tower.
As shown in fig. 1 and fig. 2, the flue gas waste heat recovery saturated steam flash evaporation power generation system 100 includes: flash vessel, steam turbine 23, condenser 24 and gas heater 4, flash vessel, steam turbine 23, condenser 24 and gas heater 4 connect gradually end to end, form a circulation circuit, and gas heater 4 is suitable for the setting in the exhaust fume path of boiler 1 of flue gas waste heat recovery system 10, and condenser 24 can utilize the cooling water of cooling tower to condense into the condensate water with the steam of discharging in the steam turbine 23.
Wherein, the condensate water that condenser 24 discharged flows into gas heater 4 to heat transfer is carried out with the flue gas in gas heater 4 department, thereby can the degree of depth reduce exhaust gas temperature, and the condensate water temperature that gets into gas heater 4 is 70 ℃, the temperature of condensate water can be improved to 100 ℃ from 70 ℃, thereby can realize the requirement of saturated steam power generation, high temperature condensate water gets into the flash vessel, and a part of condensate water becomes saturated steam and supplies steam turbine 23 after the flash vessel's dilatation decompression, thereby generate electricity, steam through steam turbine 23 rethread condenser 24 condenses into condensate water, and then accomplishes a circulation.
The location of the flue gas heat exchanger 4 is not exclusive, for example, as shown in fig. 1, the flue gas heat exchanger 4 is connected before the desulfurization device 5, and specifically, the flue gas heat exchanger 4 is connected between the dust remover 2 and the fan 3. Wherein, the flue gas heat exchanger 4 is arranged in front of the desulfurizer 5, and the temperature of the flue gas can be reduced from 175 (electric power) to 270 ℃ (steel/chemical industry/coking) to 115 ℃ (electric power) to 210 ℃ (steel/chemical industry/coking). As another example, as shown in fig. 2, the flue gas heat exchanger 4 is connected after the desulfurization device 5, and specifically, the flue gas heat exchanger 4 is connected between the desulfurization device 5 and the stack 6. Wherein, desulphurization unit 5 is followed to set up gas heater 4, can reduce the exhaust gas temperature to 190 ℃ (steel/chemical industry/coking) from higher 250 ℃ (steel/chemical industry/coking). The arrangement of the two flue gas heat exchangers 4 can realize energy-saving modification and utilization of deeply reducing the exhaust gas temperature.
Therefore, according to the flue gas waste heat recovery saturated steam flash evaporation power generation system 100 provided by the embodiment of the invention, on one hand, the exhaust gas temperature can be effectively reduced, the flue gas temperature is reduced to 60 ℃ by the flue gas heat exchanger 4, the corrosion to relevant parts of the flue gas waste heat recovery system 10 can be slowed down, on the other hand, the flue gas temperature can be reasonably utilized to raise the temperature of the condensed water, so that the flue gas waste heat recovery saturated steam flash evaporation power generation system 100 can generate power, the latent heat generated after the temperature is raised can be used for generating power by deeply digging the condensed water after heat exchange of the flue gas waste heat, the utilization efficiency of energy is greatly improved, the technical scope of energy conservation and comprehensive utilization of resources is met, the energy can.
According to an alternative embodiment of the invention, the flash tank is at least two. In other words, the flash tank can be a multi-stage flash tank instead of a single-stage flash tank, and the multi-stage flash tank can expand and decompress the high-temperature condensed water for many times, so that more flash steam can be used for the steam turbine 23 to generate electricity, and the power generation efficiency of the flue gas waste heat recovery saturated steam flash power generation system 100 can be improved.
Further, as shown in fig. 1 and fig. 2, two flash evaporators are provided, and the two flash evaporators are respectively a first-stage flash evaporator 21 and a second-stage flash evaporator 22, the first-stage flash evaporator 21 and the second-stage flash evaporator 22 are both provided with a condensed water inlet, a steam outlet and a condensed water outlet, the steam outlet of the first-stage flash evaporator 21 and the steam outlet of the second-stage flash evaporator 22 are both connected with a steam turbine 23, the condensed water inlet of the first-stage flash evaporator 21 is connected with a flue gas heat exchanger 4, the condensed water outlet of the first-stage flash evaporator 21 is connected with the condensed water inlet of the second-stage flash evaporator 22, and the condensed water outlet of the second-stage flash evaporator 22 is connected with the flue gas heat exchanger 4. In other words, between gas heater 4 and steam turbine 23, first-stage flash vessel 21 and second-stage flash vessel 22 are series connection in proper order, and second-stage flash vessel 22 can also supply the condensate water again in gas heater 4 and carry out the heat transfer, and this kind of mode can be excavated the energy degree of depth of condensate water intensification in-process, can improve power plant's efficiency.
Wherein, be provided with admission control valve 26 between the steam outlet of one-level flash vessel 21 and the admission of steam turbine 23, admission control valve 26 can control the steam volume that one-level flash vessel 21 entered into steam turbine 23, is provided with benefit vapour control valve 27 between the steam outlet of second grade flash vessel 22 and the benefit vapour mouth of steam turbine 23, and benefit vapour control valve 27 can control the steam volume that second grade flash vessel 22 entered into steam turbine 23.
Specifically, as shown in fig. 1 and fig. 2, the flue gas waste heat recovery saturated steam flash evaporation power generation system 100 further includes: the water mixer 25, the condensed water outlet of the secondary flash expansion tank 22 and the condensed water outlet of the condenser 24 are connected with the flue gas heat exchanger 4 through the water mixer 25. In other words, water mixer 25 has two imports, and two imports are connected with the condensate outlet of second grade flash vessel 22 and the condensate outlet of condenser 24 respectively, and blender 25 can play the effect of mixing the condensate to can make entire system simple structure, the condensate flow is smooth and easy nature. In addition, the flue gas recovery system can also be used in flue gas recovery systems of waste heat boilers 1 in steel mills, metallurgy, chemical industry and the like. The waste heat of the flue gas can be recovered, the power utilization efficiency of the whole plant can be improved, and the plant power utilization rate is reduced.
Optionally, the flue gas heat exchanger 4 includes a cold end heated wall corresponding to the flue gas, and the cold end heated wall is an ND steel plate wall, a Corten steel plate wall, or a fluoroplastic plate wall. Therefore, the material can solve the problem of low-temperature corrosion of the heat transfer pipe. According to the test result, the operation of the flue gas waste heat recovery system 10 is safe and reliable in the expected 20-year life cycle of the heat exchange equipment made of ND steel, Corten steel (Cowden steel), fluoroplastic and the like.
If the non-condensed gas in the condenser 24 is not discharged in time, the vacuum of the condenser 24 is gradually destroyed, and the operation economy of the unit is reduced. In order to ensure the vacuum of the condenser 24 and extract the non-condensable gas in the condenser 24, the flue gas waste heat recovery saturated steam flash evaporation power generation system 100 further comprises: and a vacuumizing device (not shown) connected with the condenser 24 to extract non-condensable gas therein. The vacuum-pumping apparatus includes: the water jet pump is connected with the water jet air extractor, and the water jet air extractor is also connected with the condenser 24. Each unit of the project is provided with two water jet air extractors arranged at high positions and is provided with two water jet pumps.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. The utility model provides a flue gas waste heat recovery saturated steam flash distillation power generation system which characterized in that includes: flash vessel, steam turbine, condenser and gas heater, the flash vessel the steam turbine the condenser with gas heater connects gradually end to end, gas heater is suitable for the setting in the route of discharging fume of boiler, with gas heater department carries out the heat transfer of flue gas and condensate water.
2. The flue gas waste heat recovery saturated steam flash evaporation power generation system according to claim 1, wherein the number of the flash evaporators is at least two.
3. The flue gas waste heat recovery saturated steam flash evaporation power generation system according to claim 2, wherein the flash evaporation flash evaporators are two and are respectively a primary flash evaporator and a secondary flash evaporator, the primary flash evaporator and the secondary flash evaporator are provided with a condensed water inlet, a steam outlet and a condensed water outlet, the steam outlet of the primary flash evaporator and the steam outlet of the secondary flash evaporator are connected with the steam turbine, the condensed water inlet of the primary flash evaporator is connected with the flue gas heat exchanger, the condensed water outlet of the primary flash evaporator is connected with the condensed water inlet of the secondary flash evaporator, and the condensed water outlet of the secondary flash evaporator is connected with the flue gas heat exchanger.
4. The flue gas waste heat recovery saturated steam flash evaporation power generation system according to claim 3, further comprising: and the condensed water outlet of the secondary flash expansion tank and the condensed water outlet of the condenser are connected with the flue gas heat exchanger through the water mixer.
5. The flue gas waste heat recovery saturated steam flash evaporation power generation system according to claim 3, wherein a steam inlet control valve is arranged between a steam outlet of the primary flash evaporation flash evaporator and a steam inlet of the steam turbine, and a steam supplementing control valve is arranged between a steam outlet of the secondary flash evaporation flash evaporator and a steam supplementing port of the steam turbine.
6. The flue gas waste heat recovery saturated steam flash evaporation power generation system of claim 1, wherein the flue gas heat exchanger comprises a cold end heated wall corresponding to flue gas, and the cold end heated wall is an ND steel plate wall, a Corten steel plate wall or a fluoroplastic plate wall.
7. The flue gas waste heat recovery saturated steam flash evaporation power generation system according to claim 1, further comprising: and the vacuumizing equipment is connected with the condenser so as to extract non-condensable gas in the vacuumizing equipment.
8. The flue gas waste heat recovery saturated steam flash evaporation power generation system according to claim 7, wherein the vacuumizing device comprises: the water jet pump is connected with the water jet air ejector, and the water jet air ejector is also connected with the condenser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910157095.0A CN111637433A (en) | 2019-03-01 | 2019-03-01 | Flue gas waste heat recovery saturated steam flash evaporation power generation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910157095.0A CN111637433A (en) | 2019-03-01 | 2019-03-01 | Flue gas waste heat recovery saturated steam flash evaporation power generation system |
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| CN111637433A true CN111637433A (en) | 2020-09-08 |
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| CN201910157095.0A Pending CN111637433A (en) | 2019-03-01 | 2019-03-01 | Flue gas waste heat recovery saturated steam flash evaporation power generation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113513377A (en) * | 2021-05-28 | 2021-10-19 | 杭州大路实业有限公司 | Steam turbine for recycling waste heat of ultralow-temperature low-pressure esterification steam |
-
2019
- 2019-03-01 CN CN201910157095.0A patent/CN111637433A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113513377A (en) * | 2021-05-28 | 2021-10-19 | 杭州大路实业有限公司 | Steam turbine for recycling waste heat of ultralow-temperature low-pressure esterification steam |
| CN113513377B (en) * | 2021-05-28 | 2022-10-11 | 杭州大路实业有限公司 | Steam turbine for recycling waste heat of ultralow-temperature low-pressure esterification steam |
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