CN210291817U - 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 PDF

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Publication number
CN210291817U
CN210291817U CN201920269130.3U CN201920269130U CN210291817U CN 210291817 U CN210291817 U CN 210291817U CN 201920269130 U CN201920269130 U CN 201920269130U CN 210291817 U CN210291817 U CN 210291817U
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China
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flue gas
flash
steam
power generation
waste heat
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CN201920269130.3U
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崔建新
王君
刘美玉
荣连军
胡铭
陈飞
胡卫冲
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Beijing Xianghuan Times Technology Co Ltd
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Beijing Xianghuan Times Technology Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/30Technologies for a more efficient combustion or heat usage

Abstract

The utility model discloses a flue gas waste heat recovery saturated steam flash distillation power generation system, the system 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 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

Flue gas waste heat recovery saturated steam flash evaporation power generation system
Technical Field
The utility model belongs to the technical field of the waste heat power generation technique and specifically relates to a flue gas waste heat recovery saturated steam flash distillation power generation system is related to.
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.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, an object of the utility model is to provide a flue gas waste heat recovery saturated steam flash distillation power generation system, this system can utilize flue gas waste heat electricity generation to can reduce the heat loss of discharging fume, the energy can be saved moreover, is favorable to the environmental protection.
According to the utility model discloses flue gas waste heat recovery saturated steam flash distillation power generation system, include: 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 sets up 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 utility model discloses flue gas waste heat recovery saturated steam flash distillation power generation system can effectively reduce exhaust gas temperature on the one hand, and flue gas heat exchanger reduces flue gas temperature to 60 ℃, and on the other hand can the rational utilization flue gas temperature rise condensation water temperature to make the system can generate electricity, this kind of mode can effectively be used for flue gas waste heat recovery and generate electricity, accords with energy saving and comprehensive utilization of resources technical category, can not only the energy saving and can save the investment cost of engineering.
In some examples of the invention, the flash tank is at least two.
The utility model discloses an in some examples, the flash vessel is two and is one-level flash vessel and second grade flash vessel respectively, one-level flash vessel with second grade flash vessel all is provided with condensate inlet, steam outlet and condensate outlet, the steam outlet of one-level flash vessel with the steam outlet of second grade flash vessel all with the steam turbine is connected, the condensate inlet of one-level flash vessel with flue gas heat exchanger is connected, the condensate outlet of one-level flash vessel with the condensate inlet of second grade flash vessel is connected, the condensate outlet of second grade flash vessel with flue gas heat exchanger is connected.
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.
The utility model discloses an in some examples, the steam outlet of one-level flash vessel with be provided with admission control valve between the steam inlet of steam turbine, the steam outlet of second grade flash vessel with be provided with the benefit vapour control valve between the benefit vapour mouth of steam turbine.
In some examples of the present invention, the flue gas heat exchanger includes a cold end heated wall corresponding to the flue gas, the cold end heated wall is one of ND steel plate wall, Corten steel plate wall and 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 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.
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 evaporation power generation system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a flue gas waste heat recovery saturated steam flash evaporation power generation system according to another embodiment of the present 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 are described in detail below, and the embodiments described with reference to the drawings are exemplary.
The flue gas waste heat recovery saturated steam flash evaporation power generation system 100 according to the embodiment of the present invention is described below with reference to fig. 1-2, 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 make rational use of the flue gas waste heat recovery system 10, and can effectively reduce the flue gas temperature.
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 sets up in the smoke exhaust 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.
From this, according to the utility model discloses flue gas waste heat recovery saturated steam flash distillation power generation system 100, on the one hand can effectively reduce exhaust gas temperature, flue gas heat exchanger 4 reduces 60 ℃ to flue gas temperature, can slow down the corruption to flue gas waste heat recovery system 10's relevant part, on the other hand can rational utilization flue gas temperature rise condensation water temperature, thereby make flue gas waste heat recovery saturated steam flash distillation power generation system 100 can generate electricity, latent heat after its intensification can be excavated with the condensation water depth after the waste heat flue gas heat transfer like this generates electricity, the utilization efficiency of the energy is greatly improved, accord with energy saving and resource comprehensive utilization technical category, can not only the energy saving and can save the investment cost of engineering.
According to an optional embodiment of the utility model, the flash tank is two at least. 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 one of an ND steel plate wall, a Corten steel plate wall, and 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 present 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 present 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 sets up 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 one of an ND steel plate wall, a Corten steel plate wall and 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.
CN201920269130.3U 2019-03-01 2019-03-01 Flue gas waste heat recovery saturated steam flash evaporation power generation system Active CN210291817U (en)

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Application Number Priority Date Filing Date Title
CN201920269130.3U CN210291817U (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
CN201920269130.3U CN210291817U (en) 2019-03-01 2019-03-01 Flue gas waste heat recovery saturated steam flash evaporation power generation system

Publications (1)

Publication Number Publication Date
CN210291817U true CN210291817U (en) 2020-04-10

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