CN203489244U - Boiler smoke waste-heat applicable system - Google Patents
Boiler smoke waste-heat applicable system Download PDFInfo
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- CN203489244U CN203489244U CN201320335722.3U CN201320335722U CN203489244U CN 203489244 U CN203489244 U CN 203489244U CN 201320335722 U CN201320335722 U CN 201320335722U CN 203489244 U CN203489244 U CN 203489244U
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Abstract
The utility model discloses a boiler smoke waste-heat applicable system, wherein smoke exhausted by a boiler (21) passes through an air preheater (22), a smoke cooler (23), a desulfurization system (26) and a smoke heat exchanger (29) which are connected in sequence, then enters a chimney (27) and is exhausted; and the smoke cooled by the smoke cooler (23) passes through the desulfurization system (26) and then enters a smoke secondary heat exchanger (29) for second cooling, and the temperature of the smoke is reduced by the smoke heat exchanger (29) to be below a water dew point temperature. According to the boiler smoke waste-heat applicable system in the utility model, the smoke heat exchanger is used to reduce the smoke temperature to be below the water dew point temperature and smoke exhausting temperature of the boiler can be reduced to be below the water dew point temperature, so that the smoke exhausting temperature can be reduced greatly, latent hear of vapor in the smoke can be further recycled based on recycling of sensible heat of the smoke, smoke waste heat can be recycled deeply, coal consumption is reduced and economic returns are good.
Description
Technical field
The utility model relates to boiler afterheat recovery technology field, relates in particular to a kind of residual heat from boiler fume and utilizes system.
Background technology
The two large main losses in thermal power plant are respectively cold source energy and heat loss due to exhaust gas.Cold source energy directly has influence on the height of thermal efficiency of cycle, and for common generating set, 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%.A key factor that affects 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 60%～70% of the total heat loss of boiler.10 ℃ of the every risings of exhaust gas temperature, boiler efficiency just declines 0.6～1.0%, the standard coal consumption 1.2～2.4g/(kWh that rises), thus the huge waste of steam coal for power caused.At present, the too high one of the main reasons that affects boiler efficiency that become of exhaust gas temperature.For alleviating cold end corrosion, the exhaust gas temperature of boiler generally designs at 130～150 ℃, but usually because back-end surfaces dust stratification, burn into leak out and the impact of combustion conditions, and actual motion exhaust gas temperature is higher than design load more than 20 ℃.Therefore, reduce exhaust gas temperature for saving fuel, improving unit efficiency, reduce pollution and there is important practical significance.
As shown in Figure 1, existing residual heat from boiler fume utilizes system, conventionally between the air preheater of boiler and cleaner, gas cooler is installed, utilize the condensate water of fume afterheat heating heat regenerative system, after condensate water heat absorption, return to low-pressure heater, then turbine low pressure cylinder utilizes this part flue gas heat to drive generator generating, has produced certain economic benefit.
Owing to need to consider to prevent cold end corrosion when designing, for fear of occurring cold end corrosion, low-pressure coal saver inlet tube wall temperature is controlled on flue gas acid dew point conventionally.But heat transfer temperature difference is low like this, the heat of recovery is few, causes certain energy waste.Therefore, need to design a kind of novel residual heat from boiler fume and utilize system.
Summary of the invention
In view of this, a technical problem to be solved in the utility model 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 to water dew point temperature, the latent heat of condensation of steam in recovered flue gas.
Residual heat from boiler fume utilizes a system, comprising: flue gas heat-exchange unit; Described flue gas heat-exchange unit is set between desulphurization system and chimney; Air preheater, described desulphurization system and the described flue gas heat-exchange unit of the flue gas that boiler is discharged through connecting successively; Wherein, flue gas by described desulphurization system after, enter described flue gas heat-exchange unit and be cooled, described flue gas heat-exchange unit is brought down below water dew point temperature by the temperature of flue gas.
According to system of the present utility model embodiment, further, between air preheater and desulphurization system, gas cooler is set.
According to system of the present utility model embodiment, further, the cold junction entrance 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 enters described gas cooler through described cold junction entrance and is heated, and flows back in described system to be heated through described cold side outlet; Described system to be heated comprises: heat regenerative system, the heat supply network circulating water boiler secondary air air system of unifying; Described cooling medium comprises: water, air.
According to system of the present utility model embodiment, further, between described gas cooler and heat supply network circulation, heat exchanger is set; Described heat exchanger (25) is connected with described heat supply network circulation (20) with described gas cooler (23) respectively; Wherein, the heat supply network backwater heat-shift in the described heat supply network circulation of the cooling water in the described gas cooler of the described heat exchanger of flowing through and the described heat exchanger of flowing through, heats described heat supply network backwater.
According to system of the present utility model embodiment, further, described system to be heated, described flue gas heat-exchange unit and described gas cooler form closed circuit; Wherein, the cooling medium in described system to be heated enters the entrance of described flue gas heat-exchange unit, flow through successively described flue gas heat-exchange unit, gas cooler; Cooling medium in described system to be heated by post bake after, by the outlet of described gas cooler, flow back to described system to be heated.
According to system of the present utility model embodiment, 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 system of the present utility model embodiment, further, the delivery port of the water inlet of described gas cooler low-temperature zone device and described gas cooler high temperature section device is connected with described system to be heated respectively, 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; Wherein, cooling water in described system to be heated enters the water inlet of described gas cooler low-temperature zone device, described gas cooler low-temperature zone device and the described gas cooler high temperature section device of flowing through and connecting successively, cooling water in described system to be heated by post bake after, the delivery port by described gas cooler high temperature section device flows back in described system to be heated.
According to system of the present utility model embodiment, further, between described flue gas heat-exchange unit and described chimney, dewater unit is set; Described dewater unit is connected with described chimney with described flue gas heat-exchange unit respectively; Wherein, the flue gas of the described flue gas heat-exchange unit of process enters described dewater unit, and described dewater unit is further removed the condensate water in flue gas.
Residual heat from boiler fume of the present utility model utilizes system, by heat exchanger, the temperature of flue gas is brought down below to water dew point temperature, reduces significantly exhaust gas temperature, on the basis of recovered flue gas sensible heat
Upper, the latent heat of steam in further recovered flue gas, the degree of depth has reclaimed fume afterheat, has reduced the coal consumption of boiler, good in economic efficiency.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the schematic diagram that a kind of residual heat from boiler fume of the prior art utilizes 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; 9-oxygen-eliminating device;
Fig. 2 is the schematic diagram that residual heat from boiler fume of the present utility model utilizes an embodiment of system;
Fig. 3 is the schematic diagram that residual heat from boiler fume of the present utility model utilizes another embodiment of system;
Fig. 4 is the schematic diagram that residual heat from boiler fume of the present utility model utilizes another embodiment of system.
The specific embodiment
With reference to the accompanying drawings the utility model is described more fully, exemplary embodiment of the present utility model is wherein described.Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiment.Embodiment based in the utility model, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.Below in conjunction with figure and embodiment, the technical solution of the utility model is carried out to many-sided description.
Fig. 2 is the schematic diagram that residual heat from boiler fume of the present utility model 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 passes through air preheater 22, gas cooler 23, desulphurization system 26 and flue gas heat-exchange unit 29 successively, enters chimney 27 and is discharged.Flue gas heat-exchange unit 29, when further reducing flue-gas temperature, reclaims the latent heat of steam in desulphurization system outlet flue gas.
The flue gas cooling by gas cooler 23 passes through desulphurization system 26, enters flue gas heat-exchange unit 29 cooling by secondary, and flue gas heat-exchange unit 29 is brought down below water dew point temperature by the temperature of flue gas.
Cooler is a class of heat transmission equipment, and in order to cooling fluid, water or air are that cooling agent is to remove heat conventionally.Heat exchanger is the equipment of cold fluid that the part heat of hot fluid is passed to, and claims again heat exchanger.Flue gas heat-exchange unit 29 is down to water dew point by flue-gas temperature needs to carry out preservative treatment below, and gas cooler 23 can be cooler of the prior art.
According to an embodiment of the present utility model, the cold junction entrance 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 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, can also be boiler secondary air air system, chemical water charging system etc., and cooling medium is also not limited to water, can also be air etc.
According to an embodiment of the present utility model, 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, the flue gas heat-exchange unit 29 of flowing through successively, gas cooler 23.Cooling medium in system to be heated by post bake after, by the outlet of gas cooler 23, flow back to system to be heated.
From boiler air preheater 22 high-temperature flue gas out, the condensate water that adds Back-heating System of Heat Power Plant 28 through gas cooler 23 reduces exhaust gas temperature, then enter boiler dust remover 24 dedustings, then enter desulfurizing tower 26 desulfurization, low-temperature flue gas after desulfurization is cooled to below water dew point through flue gas heat-exchange unit 29 by the working medium in heating flue gas heat-exchange unit again, steam in flue gas is condensed, the latent heat of steam in recovered flue gas.
Fig. 3 is the schematic diagram that residual heat from boiler fume of the present utility model utilizes another embodiment of system.As shown in the figure: gas cooler 23 is connected with heat supply network circulation 20, fume afterheat is used for heating hot net water and comes to hot user's heat supply.
Between gas cooler 23 and heat supply network circulation 20, heat exchanger 25 is set, the heat supply network backwater heat-shift in the heat supply network circulation of the cooling water in the gas cooler 23 of the heat exchanger 25 of flowing through and the heat exchanger 25 of flowing through, heating heat supply network backwater.
Can be 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 23Yu power plant heat regenerative system is connected, and utilizes fume afterheat to carry out heat-setting water.Also can in flue gas waste heat recovery system, increase valve, realize the switching that heating period is connected with different system with the gas cooler 23 of non-heating period.
According to an embodiment of the present utility model, between gas cooler 23 and desulphurization system 26, boiler dust remover 24 is set.Flue gas through gas cooler 23 enters after boiler dust remover 24 dedustings, enters desulfurizing tower 26 desulfurization.
Fig. 4 is the schematic diagram that residual heat from boiler fume of the present utility model 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 delivery port of the water inlet of gas cooler low-temperature zone device 32 and gas cooler high temperature section device 31 is connected with system to be heated respectively, 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, the gas cooler low-temperature zone of flowing through successively device 32 and gas cooler high temperature section device 31, cooling water in system to be heated by post bake after, the delivery port by gas cooler high temperature section device 31 flows back in system to be heated.
According to an embodiment of the present utility model, between flue gas heat-exchange unit 29 and chimney 27, dewater unit is set.Flue gas through flue gas heat-exchange unit 29 enters dewater unit, and dewater unit is removed the condensate water in flue gas.The effect of dewater unit is the condensate water further removing from the flue gas of flue gas heat-exchange unit 9 outlets.
Residual heat from boiler fume of the present utility model utilizes system, can reduce exhaust gas temperature to water dew point, reduce significantly exhaust gas temperature, on the basis of recovered flue gas sensible heat, the latent heat of steam in further recovered flue gas, the degree of depth has reclaimed fume afterheat, has reduced the coal consumption of boiler, good in economic efficiency.
Description of the present utility model provides for example with for the purpose of describing, and is not exhaustively or by the utility model to be limited to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Selecting and describing embodiment is for better explanation principle of the present utility model and practical application, thereby and makes those of ordinary skill in the art can understand the various embodiment with various modifications that the utility model design is suitable for special-purpose.
Claims (8)
1. residual heat from boiler fume utilizes a system, it is characterized in that, comprising:
Flue gas heat-exchange unit (29);
Between desulphurization system (26) and chimney (27), described flue gas heat-exchange unit (29) is set; Air preheater (22), described desulphurization system (26) and the described flue gas heat-exchange unit (29) of the flue gas that boiler (21) is discharged through connecting successively;
Wherein, flue gas by described desulphurization system (26) after, enter described flue gas heat-exchange unit (29) and be cooled, described flue gas heat-exchange unit (29) is brought down below water dew point temperature by the temperature of flue gas.
2. the system as claimed in claim 1, is characterized in that:
Between air preheater (22) and desulphurization system (26), gas cooler (23) is set.
3. system as claimed in claim 2, is characterized in that:
The cold junction entrance 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 enters described gas cooler (23) through described cold junction entrance and is heated, and flows back in described system to be heated through described cold side outlet;
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:
Between described gas cooler (23) and heat supply network circulation (20), heat exchanger (25) is set; Described heat exchanger (25) is connected with described heat supply network circulation (20) with described gas cooler (23) respectively;
Wherein, the heat supply network backwater heat-shift in the described heat supply network circulation of the cooling water in the described gas cooler (23) of the described heat exchanger (25) of flowing through and the described heat exchanger (25) of flowing through, heats 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), the described flue gas heat-exchange unit (29) of flowing through successively, gas cooler (23); Cooling medium in described system to be heated by post bake after, by the outlet of described gas cooler (23), flow back to described system to be heated.
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 delivery port of the water inlet of described gas cooler low-temperature zone device (32) and described gas cooler high temperature section device (31) is connected with described system to be heated respectively, 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), described gas cooler low-temperature zone device (32) and the described gas cooler high temperature section device (31) of flowing through and connecting successively, cooling water in described system to be heated by post bake after, the delivery port by described gas cooler high temperature section device (31) flows back in described system to be heated.
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; Described dewater unit is connected with described chimney (27) with described flue gas heat-exchange unit (29) respectively; Wherein, the flue gas of the described flue gas heat-exchange unit of process (29) enters described dewater unit, and described dewater unit is further removed the condensate water in flue gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320335722.3U CN203489244U (en) | 2013-06-13 | 2013-06-13 | Boiler smoke waste-heat applicable system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320335722.3U CN203489244U (en) | 2013-06-13 | 2013-06-13 | Boiler smoke waste-heat applicable system |
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| CN203489244U true CN203489244U (en) | 2014-03-19 |
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| CN201320335722.3U Expired - Lifetime CN203489244U (en) | 2013-06-13 | 2013-06-13 | Boiler smoke waste-heat applicable system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104266171A (en) * | 2014-08-28 | 2015-01-07 | 国电龙源节能技术有限公司 | Flue gas waste heat utilization system of thermal power plant |
| CN108679638A (en) * | 2018-05-29 | 2018-10-19 | 上海电力学院 | A kind of condensation-reheating integration plume disappears white system |
| CN109529583A (en) * | 2018-12-20 | 2019-03-29 | 大唐环境产业集团股份有限公司 | UTILIZATION OF VESIDUAL HEAT IN is discarded for coal-burning power plant and eliminates the device and method of chimney white cigarette |
| CN109724099A (en) * | 2019-01-30 | 2019-05-07 | 江苏罗奈德流体科技有限公司 | A kind of white technique of boiler smoke qi exhaustion and device |
-
2013
- 2013-06-13 CN CN201320335722.3U patent/CN203489244U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104266171A (en) * | 2014-08-28 | 2015-01-07 | 国电龙源节能技术有限公司 | Flue gas waste heat utilization system of thermal power plant |
| CN108679638A (en) * | 2018-05-29 | 2018-10-19 | 上海电力学院 | A kind of condensation-reheating integration plume disappears white system |
| CN109529583A (en) * | 2018-12-20 | 2019-03-29 | 大唐环境产业集团股份有限公司 | UTILIZATION OF VESIDUAL HEAT IN is discarded for coal-burning power plant and eliminates the device and method of chimney white cigarette |
| CN109724099A (en) * | 2019-01-30 | 2019-05-07 | 江苏罗奈德流体科技有限公司 | A kind of white technique of boiler smoke qi exhaustion and device |
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