CN104235827A - Boiler smoke waste heat utilization system - Google Patents
Boiler smoke waste heat utilization system Download PDFInfo
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- CN104235827A CN104235827A CN201310231658.9A CN201310231658A CN104235827A CN 104235827 A CN104235827 A CN 104235827A CN 201310231658 A CN201310231658 A CN 201310231658A CN 104235827 A CN104235827 A CN 104235827A
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- Prior art keywords
- heat
- gas cooler
- flue gas
- heated
- boiler
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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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Abstract
The invention discloses a boiler smoke waste heat utilization system. Smoke from a boiler (21) enters a chimney (27) to be discharged after passing through an air pre-heater (22), a smoke cooler (23), a desulfurization system (26) and a smoke heat exchanger (29) sequentially, smoke cooled by the smoke cooler (23) enters the secondary smoke heat exchanger (29) through the desulfurization system (26) for secondary cooling, and the temperature of smoke is reduced to be lower than the water dew point temperature through the smoke heat exchanger (29). According to the system, the temperature of smoke discharged by the boiler can be reduced to be lower than the water dew point temperature through the smoke heat exchanger, the temperature of discharged smoke is reduced greatly, latent heat of water vapor in smoke is further recycled on the basis that sensible heat of smoke is recycled, smoke waste heat is recycled completely, coal consumption of the boiler is reduced, and economic efficiency is high.
Description
Technical field
The present invention relates to boiler afterheat recovery technology field, particularly relate to a kind of residual heat from boiler fume and utilize system.
Background technology
The two large main losses in thermal power plant are cold source energy and heat loss due to exhaust gas respectively.Cold source energy directly has influence on the height of thermal efficiency of cycle, and for common generator group, cold source energy is decided by the design parameter of unit.Heat loss due to exhaust gas is one maximum in station boiler various heat losses, and the heat loss due to exhaust gas of modern station boiler is generally about 4% ~ 8%.The key factor affecting heat loss due to exhaust gas is exhaust gas temperature.According to statistics, in thermal power plant, the heat loss due to exhaust gas of boiler accounts for boiler Total heat loss's 60% ~ 70%.Exhaust gas temperature often rises 10 DEG C, and boiler efficiency just declines 0.6 ~ 1.0%, standard coal consumption rising 1.2 ~ 2.4g/(kWh), thus cause the huge waste of steam coal for power.At present, exhaust gas temperature is too high has become the one of the main reasons affecting boiler efficiency.For alleviating cold end corrosion, the exhaust gas temperature of boiler generally designs at 130 ~ l50 DEG C, but usually because back-end surfaces dust stratification, burn into leak out and the impact of combustion conditions, actual motion exhaust gas temperature is higher than design load more than 20 DEG C.Therefore, reduce exhaust gas temperature for saving fuel, raising unit efficiency, reduce pollution and there is important practical significance.
As shown in Figure 1, existing residual heat from boiler fume utilizes system, usually between the air preheater and cleaner of boiler, gas cooler is installed, fume afterheat is utilized to heat the condensate water of heat regenerative system, low-pressure heater is returned after condensate water heat absorption, then turbine low pressure cylinder utilizes this part flue gas heat drive electrical generators to generate electricity, and creates certain economic benefit.
Owing to needing consideration to prevent cold end corrosion when designing, in order to avoid there is cold end corrosion, low-pressure coal saver inlet tube wall temperature controls usually on flue gas acid dew point.But such heat transfer temperature difference is low, the heat of recovery is few, causes certain energy waste.Therefore, a kind of novel residual heat from boiler fume of design is needed to utilize system.
Summary of the invention
In view of this, the technical problem that the present invention will solve is to provide a kind of residual heat from boiler fume and utilizes system, by heat exchanger, the temperature of flue gas is brought down below aqueous dew point temperature, the latent heat of condensation of water vapour in recovered flue gas.
A kind of residual heat from boiler fume utilizes system, comprising: flue gas heat-exchange unit; Described flue gas heat-exchange unit is set between desulphurization system and chimney; The flue gas that boiler is discharged is successively through air preheater, described desulphurization system and described flue gas heat-exchange unit; Wherein, flue gas is by after described desulphurization system, and enter described flue gas heat-exchange unit and be cooled, the temperature of flue gas is brought down below aqueous dew point temperature by described flue gas heat-exchange unit.
According to an embodiment of system of the present invention, further, gas cooler is set between air preheater and desulphurization system.
According to an embodiment of system of the present invention, further, the cold-side inlet of described gas cooler is connected with system to be heated respectively with cold side outlet; Wherein, the cooling medium in described system to be heated is heated through described gas cooler, flows back in described system to be heated; Described system to be heated comprises: heat regenerative system, heat supply network circulating water are unified boiler secondary air air system; Described cooling medium comprises: water, air.
According to an embodiment of system of the present invention, further, heat exchanger is set between described gas cooler and heat supply network circulation; Wherein, flow through the cooling water in the described gas cooler of described heat exchanger and the heat supply network backwater heat-shift flowed through in the described heat supply network circulation of described heat exchanger, heat described heat supply network backwater.
According to an embodiment of system of the present invention, further, described system to be heated, described flue gas heat-exchange unit and described gas cooler composition closed circuit; Wherein, the cooling medium in described system to be heated enters the entrance of described flue gas heat-exchange unit, flows through described flue gas heat-exchange unit, gas cooler successively; Cooling medium in described system to be heated, by after post bake, flows back to described system to be heated by the outlet of described gas cooler.
According to an embodiment of system of the present invention, further, described gas cooler comprises: gas cooler high temperature section device and gas cooler low-temperature zone device; Wherein, described gas cooler high temperature section device is arranged between described air preheater and boiler dust remover, and described gas cooler low-temperature zone device is arranged between described boiler dust remover and described desulphurization system.
According to an embodiment of system of the present invention, further, the water inlet of described gas cooler low-temperature zone device is connected with described system to be heated respectively with the delivery port of described gas cooler high temperature section device, and the delivery port of described gas cooler low-temperature zone device is connected with the water inlet of described gas cooler high temperature section device 31; Wherein, cooling water in described system to be heated enters the water inlet of described gas cooler low-temperature zone device, flow through described gas cooler low-temperature zone device and described gas cooler high temperature section device successively, cooling water in described system to be heated, by after post bake, is flowed back in described system to be heated by the delivery port of described gas cooler high temperature section device.
According to an embodiment of system of the present invention, further, dewater unit is set between described flue gas heat-exchange unit and described chimney; Wherein, the flue gas through described flue gas heat-exchange unit enters described dewater unit, and described dewater unit removes the condensate water in flue gas further.
Residual heat from boiler fume of the present invention utilizes system, by heat exchanger, the temperature of flue gas is brought down below aqueous dew point temperature, reduce exhaust gas temperature significantly, on the basis of recovered flue gas sensible heat, the latent heat of water vapour in further recovered flue gas, the degree of depth has reclaimed fume afterheat, reduces the coal consumption of boiler, good in economic efficiency.
Description of the invention provides in order to example with for the purpose of describing, and is not exhaustively or limit the invention to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Selecting and describing embodiment is in order to principle of the present invention and practical application are better described, and enables those of ordinary skill in the art understand the present invention thus design the various embodiments with various amendment being suitable for special-purpose.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram that a kind of residual heat from boiler fume of the prior art utilizes system;
Fig. 2 is the schematic diagram that residual heat from boiler fume of the present invention utilizes an embodiment of system;
Fig. 3 is the schematic diagram that residual heat from boiler fume of the present invention utilizes another embodiment of system;
Fig. 4 is the schematic diagram that residual heat from boiler fume of the present invention utilizes another embodiment of system;
Wherein, 1-boiler; 2-air preheater; 3-gas cooler; 4-boiler dust remover; 6-desulfurizing tower; 7-chimney; 8-power plant heat regenerative system.
Detailed description of the invention
With reference to the accompanying drawings the present invention is described more fully, exemplary embodiment of the present invention is wherein described.Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.Below in conjunction with figure and embodiment, many-sided description is carried out to technical scheme of the present invention.
Fig. 2 is the schematic diagram that residual heat from boiler fume of the present invention utilizes an embodiment of system.As shown in the figure, residual heat from boiler fume utilizes system to comprise: air preheater 22, gas cooler 23, desulphurization system 26 and flue gas heat-exchange unit 29.
The flue gas that boiler 21 is discharged, successively through air preheater 22, gas cooler 23, desulphurization system 26 and flue gas heat-exchange unit 29, enters chimney 27 and is discharged.Flue gas heat-exchange unit 29, while reducing flue-gas temperature further, reclaims the latent heat of water vapour in desulphurization system exiting flue gas.
The flue gas cooled by gas cooler 23 is by desulphurization system 26, and enter flue gas heat-exchange unit 29 by cooling twice, the temperature of flue gas is brought down below aqueous dew point temperature by flue gas heat-exchange unit 29.
Cooler is a class of heat transmission equipment, in order to cooling fluid, is that cooling agent is to remove heat usually with water or air.Heat exchanger is the equipment partial heat of hot fluid being passed to cold fluid, also known as heat exchanger.Flue-gas temperature is down to below water dew point by flue gas heat-exchange unit 29 to be needed to carry out preservative treatment, and gas cooler 23 can be cooler of the prior art.
Gas cooler 23 and flue gas heat-exchange unit 29 can be connected with the system such as the heat regenerative system of power plant or heating, and with the systems exchange such as heat regenerative system or heating heat, improve the efficiency of unit.
According to one embodiment of present invention, the cold-side inlet of gas cooler 23 is connected with system to be heated respectively with cold side outlet; Cooling medium in system to be heated is heated through gas cooler 23, flows back in system to be heated.
System to be heated utilizes the heat in flue gas as all or part of thermal source of system.System to be heated is not limited to heat regenerative system 28 and heat supply network circulation 20, and can also be boiler secondary air air system, chemical water charging system etc., cooling medium be also not limited to water, can also be air etc.
According to one embodiment of present invention, system to be heated, flue gas heat-exchange unit 29 and gas cooler 23 form closed circuit.
Cooling medium in system to be heated enters the entrance of flue gas heat-exchange unit 29, flows through flue gas heat-exchange unit 29, gas cooler 23 successively.Cooling medium in system to be heated, by after post bake, flows back to system to be heated by the outlet of gas cooler 23.
From boiler air preheater 22 high-temperature flue gas out, the condensate water adding Back-heating System of Heat Power Plant 28 through gas cooler 23 reduces exhaust gas temperature, then boiler dust remover 24 dedusting is entered, then desulfurizing tower 26 desulfurization is entered, low-temperature flue gas after desulfurization is cooled to below water dew point through flue gas heat-exchange unit 29 again by the working medium in heating flue gas heat-exchange unit, make the water recovery in flue gas, the latent heat of water vapour in recovered flue gas.
Fig. 3 is the schematic diagram that residual heat from boiler fume of the present invention utilizes another embodiment of system.As shown in the figure: gas cooler 23 is connected with heat supply network circulation 20, fume afterheat be used for heating hot net water come to heat user heat supply.
Gas cooler 23 is connected with heat supply network circulation 20.Heat supply network backwater in heat supply network circulation 20, by the water inlet of gas cooler 23, is entered after gas cooler 23 heated, is flowed back in heat supply network circulation 20 by the delivery port of gas cooler 23.
Heat exchanger 25 is set between gas cooler 23 and heat supply network circulation 20, flows through the cooling water in the gas cooler 23 of heat exchanger 25 and the heat supply network backwater heat-shift flowed through in the heat supply network circulation of heat exchanger 25, heating heat supply network backwater.
Gas cooler 23 is connected with heat exchanger 25, heat exchanger 25 is water-water heat exchanger, and heat exchanger 25 is connected with heat supply network circulation 20, and flue gas first heats the water in water-water heat exchanger, hot water in heat exchanger 25 again heat release to heat supply network circulation 20, thus heat supply.
Can at heating period, gas cooler 23 is connected with heat supply network circulation 20, utilizes fume afterheat to carry out heat supply; At non-heating period, gas cooler 23 is connected with power plant heat regenerative system, utilizes fume afterheat to carry out heat-setting water.Also can increase valve in flue gas waste heat recovery system, realize the switching that heating period is connected with different system with the gas cooler 23 of non-heating period.
According to one embodiment of present invention, boiler dust remover 24 is set between gas cooler 23 and desulphurization system 26.After the flue gas of gas cooler 23 enters boiler dust remover 24 dedusting, enter desulfurizing tower 26 desulfurization.
Fig. 4 is the schematic diagram that residual heat from boiler fume of the present invention utilizes another embodiment of system.As shown in Figure 4, gas cooler 23 comprises: gas cooler high temperature section device 31 and gas cooler low-temperature zone device 32.Gas cooler high temperature section device 31 is arranged between air preheater 22 and boiler dust remover 24, and gas cooler low-temperature zone device 32 is arranged between boiler dust remover 24 and desulphurization system 26.
The water inlet of gas cooler low-temperature zone device 32 is connected with system to be heated respectively with the delivery port of gas cooler high temperature section device 31, and the delivery port of gas cooler low-temperature zone device 32 is connected with the water inlet of gas cooler high temperature section device 31.
Cooling water in system to be heated enters the water inlet of gas cooler low-temperature zone device 32, flow through gas cooler low-temperature zone device 31 and gas cooler high temperature section device 32 successively, cooling water in system to be heated, by after post bake, is flowed back in system to be heated by the delivery port of gas cooler high temperature section device 32.
According to one embodiment of present invention, dewater unit is set between flue gas heat-exchange unit 29 and chimney 27.Flue gas through flue gas heat-exchange unit 29 enters dewater unit, and dewater unit removes the condensate water in flue gas.The effect of dewater unit removes the condensate water from the flue gas of flue gas heat-exchange unit 9 outlet further.
Residual heat from boiler fume of the present invention utilizes system, below exhaust gas temperature to water dew point can be reduced, reduce exhaust gas temperature significantly, on the basis of recovered flue gas sensible heat, the latent heat of water vapour in further recovered flue gas, the degree of depth has reclaimed fume afterheat, reduces the coal consumption of boiler, good in economic efficiency.
Claims (8)
1. residual heat from boiler fume utilizes a system, it is characterized in that, comprising:
Flue gas heat-exchange unit (29);
Described flue gas heat-exchange unit (29) is set between desulphurization system (26) and chimney (27); The flue gas that boiler (21) is discharged is successively through air preheater (22), described desulphurization system (26) and described flue gas heat-exchange unit (29);
Wherein, flue gas is by after described desulphurization system (26), and enter described flue gas heat-exchange unit (29) and be cooled, the temperature of flue gas is brought down below aqueous dew point temperature by described flue gas heat-exchange unit (29).
2. the system as claimed in claim 1, is characterized in that:
Gas cooler (23) is set between air preheater (22) and desulphurization system (26).
3. system as claimed in claim 2, is characterized in that:
The cold-side inlet of described gas cooler (23) is connected with system to be heated respectively with cold side outlet; Wherein, the cooling medium in described system to be heated is heated through described gas cooler (23), flows back in described system to be heated;
Described system to be heated comprises: heat regenerative system (28), heat supply network circulation (20) and boiler secondary air air system; Described cooling medium comprises: water, air.
4. system as claimed in claim 3, is characterized in that:
Heat exchanger (25) is set between described gas cooler (23) and heat supply network circulation (20);
Wherein, flow through the cooling water in the described gas cooler (23) of described heat exchanger (25) and the heat supply network backwater heat-shift flowed through in the described heat supply network circulation of described heat exchanger (25), heat described heat supply network backwater.
5. system as claimed in claim 2, is characterized in that:
Described flue gas heat-exchange unit (29) and described gas cooler (23) form closed circuit with system to be heated.
Wherein, the cooling medium in described system to be heated enters the entrance of described flue gas heat-exchange unit (29), flows through described flue gas heat-exchange unit (29), gas cooler (23) successively; Cooling medium in described system to be heated, by after post bake, flows back to described system to be heated by the outlet of described gas cooler (23).
6. system as claimed in claim 3, is characterized in that:
Described gas cooler (23) comprising: gas cooler high temperature section device (31) and gas cooler low-temperature zone device (32);
Wherein, described gas cooler high temperature section device (31) is arranged between boiler air preheater (22) and boiler dust remover (24), and described gas cooler low-temperature zone device (32) is arranged between described boiler dust remover (24) and described desulphurization system (26).
7. system as claimed in claim 6, is characterized in that:
The water inlet of described gas cooler low-temperature zone device (32) is connected with described system to be heated respectively with the delivery port of described gas cooler high temperature section device (31), and the delivery port of described gas cooler low-temperature zone device (32) is connected with the water inlet of described gas cooler high temperature section device (31);
Wherein, cooling water in described system to be heated enters the water inlet of described gas cooler low-temperature zone device (32), flow through described gas cooler low-temperature zone device (31) and described gas cooler high temperature section device (32) successively, cooling water in described system to be heated, by after post bake, is flowed back in described system to be heated by the delivery port of described gas cooler high temperature section device (32).
8. the system as described in claim 1 to 7 any one, is characterized in that:
Between described flue gas heat-exchange unit (29) and described chimney (27), dewater unit is set;
Wherein, the flue gas through described flue gas heat-exchange unit (29) enters described dewater unit, and described dewater unit removes the condensate water in flue gas further.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310231658.9A CN104235827A (en) | 2013-06-13 | 2013-06-13 | Boiler smoke waste heat utilization system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310231658.9A CN104235827A (en) | 2013-06-13 | 2013-06-13 | Boiler smoke waste heat utilization system |
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| CN104235827A true CN104235827A (en) | 2014-12-24 |
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| CN201310231658.9A Pending CN104235827A (en) | 2013-06-13 | 2013-06-13 | Boiler smoke waste heat utilization system |
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Cited By (4)
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| CN105805768A (en) * | 2016-05-19 | 2016-07-27 | 洛阳瑞昌石油化工设备有限公司 | Energy saving and environmental protecting equipment and process for reducing white smoke in flue gas |
| CN106110826A (en) * | 2016-06-25 | 2016-11-16 | 湖州鼎诚环保科技有限公司 | A kind of flue gas water pumping system of wet desulphurization |
| CN110848725A (en) * | 2019-12-11 | 2020-02-28 | 中国电力工程顾问集团西北电力设计院有限公司 | Multipurpose flue gas waste heat recovery device and recovery method for thermal power plant |
| CN110966617A (en) * | 2019-12-24 | 2020-04-07 | 天津商业大学 | Double-effect device for utilizing waste heat of tail gas of gas boiler and eliminating colored smoke plume |
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| CN110966617A (en) * | 2019-12-24 | 2020-04-07 | 天津商业大学 | Double-effect device for utilizing waste heat of tail gas of gas boiler and eliminating colored smoke plume |
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Application publication date: 20141224 |