CN203489245U - Boiler smoke waste-heat application system - Google Patents

Boiler smoke waste-heat application system Download PDF

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Publication number
CN203489245U
CN203489245U CN201320335838.7U CN201320335838U CN203489245U CN 203489245 U CN203489245 U CN 203489245U CN 201320335838 U CN201320335838 U CN 201320335838U CN 203489245 U CN203489245 U CN 203489245U
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gas cooler
described gas
high temperature
low
heated
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付玉玲
贾明华
蒋海涛
王罡
张玉斌
杨天亮
苗雨旺
褚晓亮
蔡兴飞
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Yantai Longyuan Power Technology Co Ltd
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Yantai Longyuan Power Technology Co Ltd
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Abstract

The utility model discloses a boiler smoke waste-heat application system which comprises a smoke cooler high-temperature segment device (3) and a smoke cooler low-temperature segment device (5), wherein smoke exhausted by a boiler passes successively an air preheater (2), the smoke cooler high-temperature segment device (3), the smoke cooler low-temperature segment device (5) and a desulfurization system (6) and then enters a chimney (7) to be exhausted; and temperature of the smoke is reduced by the smoke cooler high-temperature segment device (3) and the smoke cooler low-temperature segment device (5). The boiler smoke waste-heat application system in the utility model adopts a two-stage smoke cooler, so that waste heat of the smoke exhausted by the boiler is applied in a stepped way, energy is fully saved, corrosion of a smoke cooler in the prior art can be avoided, safety and reliability of the waste-heat application system are increased, cost is saved and working efficiency of the desulfurization system is increased.

Description

A kind of residual heat from boiler fume utilizes system
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~l50 ℃, 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.
Prior art is installed gas cooler conventionally between the air preheater of boiler and cleaner, 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 huge economic benefit.Because gas cooler is usually placed in the flue after boiler tail air preheater, in the lower section of temperature, be the region that cold end corrosion easily occurs.Thus, in the design of gas cooler, need to consider to prevent cold end corrosion, still, existing system heat transfer temperature difference is low, and the heat of recovery is few, causes certain energy waste.
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, adopts two-stage flue gas cooling device cooled flue gas.
Residual heat from boiler fume utilizes a system, comprising: gas cooler high temperature section device and gas cooler low-temperature zone device; Described gas cooler high temperature section device is arranged between the air preheater and cleaner of boiler, and described gas cooler low-temperature zone device is arranged in the flue between described cleaner and desulphurization system; Described air preheater, described gas cooler high temperature section device, described cleaner, described gas cooler low-temperature zone device are connected successively with described desulphurization system; Wherein, the flue gas that boiler is discharged passes through described air preheater, described gas cooler high temperature section device, described cleaner and described gas cooler low-temperature zone device successively, enters described desulphurization system; Described gas cooler high temperature section device and described gas cooler low-temperature zone device reduce the temperature of flue gas.
According to system of the present utility model embodiment, further, the cold side outlet of the cold junction entrance of described gas cooler low-temperature zone device and described gas cooler high temperature section device is connected with system to be heated respectively, and the cold side outlet of described gas cooler low-temperature zone device is connected with the cold junction entrance of described gas cooler high temperature section device; Wherein, cooling medium in system to be heated enters the cold junction entrance 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 medium in described system to be heated by post bake after, the cold side outlet by described gas cooler high temperature section device flows back in described system to be heated; Described system to be heated comprises: heat regenerative system, heat supply network circulation, boiler secondary air air system, described cooling medium is water or air.
According to system of the present utility model embodiment, further, the cold junction entrance of the cold junction entrance of described gas cooler low-temperature zone device and described gas cooler high temperature section device is connected with system to be heated respectively, and the cold side outlet of the cold side outlet 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; Wherein, cooling medium in system to be heated enters respectively the cold junction entrance of described gas cooler low-temperature zone device and described gas cooler high temperature section device, after cooling medium in described system to be heated is heated respectively, the cold side outlet by described gas cooler low-temperature zone device and described gas cooler high temperature section device flows back in described system to be heated; Wherein, described system to be heated comprises: heat regenerative system, heat supply network circulation, boiler secondary air air system, described cooling medium is water or air.
According to system of the present utility model embodiment, further, the material of described gas cooler low-temperature zone device is acid corrosion-resistant material, comprising: with carbon steel or the fluoroplastics of enamel coating.
According to system of the present utility model embodiment, further, the material of described gas cooler high temperature section device comprises: carbon steel and ND steel.
According to system of the present utility model embodiment, further, described gas cooler high temperature section device is fin tube type heat exchanger.
According to system of the present utility model embodiment, further, the fin of described fin tube type heat exchanger is H shape.
Residual heat from boiler fume of the present utility model utilizes system, adopt two-stage gas cooler, make boiler exhaust gas waste heat obtain cascade utilization, fully energy-conservation, can solve the etching problem of gas cooler of the prior art, improve the safety and reliability of bootstrap system, and saved cost, improved the operating efficiency of desulphurization system.
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 residual heat from boiler fume of the present utility model utilizes an 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. 1 is the schematic diagram that residual heat from boiler fume of the present utility model utilizes an embodiment of system.As shown in Figure 1, residual heat from boiler fume utilizes system, comprising: gas cooler high temperature section device 3 and gas cooler low-temperature zone device 5.
Gas cooler high temperature section device 3 is arranged between the air preheater 2 and cleaner 4 of boiler, and gas cooler low-temperature zone device 5 is arranged in the flue between cleaner 4 and desulphurization system 6.
The flue gas that boiler 1 is discharged passes through air preheater 2, gas cooler high temperature section device 3, cleaner 4 and gas cooler low-temperature zone device 5 successively, enters desulphurization system 6.Gas cooler high temperature section device 3 and gas cooler low-temperature zone device 5 reduce the temperature of flue gas.
Through the flue gas of desulphurization system 6, be sent to chimney 7 and be discharged, or be sent in the smoke discharging device in boiler combustion system and discharge.
According to an embodiment of the present utility model, after gas cooler high temperature section device 3, the temperature of flue gas is: higher than 5~20 ℃ of flue gas dew point temperature.After gas cooler low-temperature zone device 5, the temperature of flue gas is: lower than flue gas dew point temperature and be more than or equal to 60 ℃ and be less than or equal to 90 ℃.
Sulfuric acid vapor when flue gas dew point temperature represents lower than this temperature in flue gas will condense, and flue gas dew point temperature is higher than water dew point temperature.Flue gas dew point temperature is main relevant with the pressure of flue gas water content and flue gas.Flue gas dew point temperature is not a definite value, what have the greatest impact is the content of sulfureous in flue gas acid vapor, sulfuric acid vapor content is high, flue gas dew point temperature will be high, sulfuric acid vapor is again that the element sulphur in raw coal is transformed, therefore in general, in raw coal, the content of sulphur is higher, and flue gas dew point temperature is also higher.
According to an embodiment of the present utility model, from boiler air preheater 2 high-temperature flue gas out, through gas cooler high temperature section device 5, add Hot gas turbine condensate water, reduce exhaust gas temperature on flue gas dew point 5~20 ℃, then enter deduster 4 dedustings, then enter gas cooler low-temperature zone device 5 and continue to add Hot gas turbine condensate water, reduce exhaust gas temperature to 80 ℃ of left and right of the best desulfurization operating temperature of desulphurization system, make desulfuration efficiency higher, flue gas enters desulfurizing tower 6 desulfurization subsequently, finally by chimney 7, discharges.
According to an embodiment of the present utility model, cooling water in system to be heated enters the water inlet of gas cooler low-temperature zone device 5, the gas cooler low-temperature zone of flowing through successively device 5 and gas cooler high temperature section device 3, steam turbine condensate water by post bake after, the delivery port by gas cooler high temperature section device 3 flows back in system to be heated.Cold junction entrance in the utility model is for needing the entrance of the cooling medium of heating, and cold side outlet is the outlet of the cooling medium after heating.
System to be heated comprises: heat regenerative system 8, heat supply network circulation, other low-pressure heater systems, boiler secondary air air system etc., and utilize heat in flue gas as all or part of thermal source of system.
In gas cooler high temperature section device 3, the remittance point of water after being heated can be heat regenerative system 8, heat supply network circulation, other low-pressure heater outlets etc., can consider according to actual conditions.
The water that enters gas cooler low-temperature zone 5 not only can be chosen the condensate water of condenser outlet, can be also low-pressure heater inlet water shuntings at different levels.Fume afterheat can also drying brown coal, add heat chemistry moisturizing or heating heat supply network recirculated water carries out heat supply etc., can be used in conjunction with the actual conditions of power plant.
For example, the delivery port of the water inlet of gas cooler low-temperature zone device 5 and gas cooler high temperature section device 3 is connected with heat regenerative system 8 respectively, and the delivery port of gas cooler low-temperature zone device 5 is connected with the water inlet of gas cooler high temperature section device 3.
Condensate water in heat regenerative system 8 enters the water inlet of gas cooler low-temperature zone device 5, the gas cooler low-temperature zone of flowing through successively device 5 and gas cooler high temperature section device 3, steam turbine condensate water is first heated up by flue gas through gas cooler low-temperature zone device 5, then flow out and from gas cooler low-temperature zone device 5, enter gas cooler high temperature section device 3 and again heated, finally flow out gas cooler high temperature section device 3, import the outlet of the low-pressure heater before oxygen-eliminating device.
By gas cooler high temperature section and gas cooler low-temperature zone and power plant heat regenerative system 8, be connected to add the condensate water of Hot gas turbine, after condensed water absorption waste heat, will squeeze steam turbine regenerative steam, the steam squeezing enters steam turbine acting, realizes the energy-saving and cost-reducing of power plant.Steam turbine condensate water enters respectively gas cooler high temperature section and low pressure stage, is imported the front portion of heat regenerative system oxygen-eliminating device after flue gas.
Steam turbine condensate water is heated by two-stage gas cooler, utilizes fume afterheat to improve condensing water temperature, has reduced extracted steam from turbine, has improved unit efficiency.
According to an embodiment of the present utility model, adopt two-stage gas cooler, reduce exhaust gas temperature to flue gas dew point, can be so that boiler exhaust gas waste heat obtain cascade utilization, fully energy-conservation.In addition, the utility model has solved the etching problem of gas cooler of the prior art, has improved the safety and reliability of bootstrap system.
According to an embodiment of the present utility model, two-stage gas cooler also can adopt mode of heating in parallel.The cold junction entrance of the cold junction entrance of gas cooler low-temperature zone device 5 and gas cooler high temperature section device 3 is connected with system to be heated respectively, and the cold side outlet of the cold side outlet of gas cooler low-temperature zone device 5 and gas cooler high temperature section device 3 is connected with system to be heated respectively;
Cooling medium in system to be heated enters respectively the cold junction entrance of gas cooler low-temperature zone device 5 and gas cooler high temperature section device 3, after cooling medium in system to be heated is heated respectively, the cold side outlet by gas cooler low-temperature zone device 5 and gas cooler high temperature section device 3 flows back in system to be heated.System to be heated comprises: heat regenerative system 8, heat supply network circulation, boiler secondary air air system, cooling medium is water or air.The backwater that can also arrange in 9 pairs of heat regenerative systems 8 of oxygen-eliminating device is processed.
According to an embodiment of the present utility model, air preheater 2, gas cooler high temperature section device 3 and gas cooler low-temperature zone device 5 are all arranged in the flue of boiler 1 afterbody.Between air preheater 2, gas cooler high temperature section device 3, gas cooler low-temperature zone device 5 and desulphurization system 6 etc., also can connect by pipeline.
According to an embodiment of the present utility model, further, the material of gas cooler low-temperature zone device 5 adopts acid corrosion-resistant material, for example: with carbon steel or the fluoroplastics of enamel coating.Teflon heat exchanger and enamel coating possess excellent decay resistance.
The material of gas cooler high temperature section device 3 comprises: carbon steel or ND steel.
09CrCuSb, code name ND steel, is sulfuric acid corrosion resistant steel.
The fin of fin tube type heat exchanger is H shape.Long-pending 5-7 times of can reach light pipe of extended surface of finned tube, can save arrangement space and save weight metal and reduce cost, can also reduce ash cutting.H shape fin extended surface is large, compact conformation, saves space, and resistance to wear, without dust stratification, resistance is low.Compare with helical fin, because fin can not precipitate with the parallel soot particle of air-flow flow direction on fin, the obstruction of smoke flow channels can not occur, and antiwear property is strong.
Residual heat from boiler fume of the present utility model utilizes system, adopts two-stage gas cooler, makes boiler exhaust gas waste heat obtain cascade utilization, can reduce exhaust gas temperature to flue gas dew point, reduce greatly exhaust gas temperature, reclaim smoke discharging residual heat, fully energy-conservation; Solve the etching problem of gas cooler of the prior art, improved the safety and reliability of bootstrap system.Simultaneously gas cooler also resistance to wear, without dust stratification, resistance is low; Two-stage flue gas cooling device is chosen different materials according to the height of flue-gas temperature, is guaranteeing, on the basis of security of system and reliability, to have saved cost; Can reduce exhaust gas temperature to the optimum working temperature of desulphurization system, improve the operating efficiency of desulphurization system.
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 (7)

1. residual heat from boiler fume utilizes a system, it is characterized in that, comprising:
Gas cooler high temperature section device (3) and gas cooler low-temperature zone device (5);
Described gas cooler high temperature section device (3) is arranged between the air preheater (2) and cleaner (4) of boiler, and described gas cooler low-temperature zone device (5) is arranged in the flue between described cleaner (4) and desulphurization system (6); Described air preheater (2), described gas cooler high temperature section device (3), described cleaner (4), described gas cooler low-temperature zone device (5) are connected successively with described desulphurization system; Wherein, the flue gas that boiler (1) is discharged passes through described air preheater (2), described gas cooler high temperature section device (3), described cleaner (4) and described gas cooler low-temperature zone device (5) successively, enters described desulphurization system (6); Described gas cooler high temperature section device (3) and described gas cooler low-temperature zone device (5) reduce the temperature of flue gas.
2. the system as claimed in claim 1, is characterized in that:
The cold side outlet of the cold junction entrance of described gas cooler low-temperature zone device (5) and described gas cooler high temperature section device (3) is connected with system to be heated respectively, and the cold side outlet of described gas cooler low-temperature zone device (5) is connected with the cold junction entrance of described gas cooler high temperature section device (3);
Wherein, cooling medium in system to be heated enters the cold junction entrance of described gas cooler low-temperature zone device (5), described gas cooler low-temperature zone device (5) and the described gas cooler high temperature section device (3) of flowing through and connecting successively, cooling medium in described system to be heated by post bake after, the cold side outlet by described gas cooler high temperature section device (3) flows back in described system to be heated; Described system to be heated comprises: heat regenerative system (8), heat supply network circulation, boiler secondary air air system, described cooling medium is water or air.
3. the system as claimed in claim 1, is characterized in that:
The cold junction entrance of the cold junction entrance of described gas cooler low-temperature zone device (5) and described gas cooler high temperature section device (3) is connected with system to be heated respectively, and the cold side outlet of the cold side outlet of described gas cooler low-temperature zone device (5) and described gas cooler high temperature section device (3) is connected with described system to be heated respectively;
Wherein, cooling medium in system to be heated enters respectively the cold junction entrance of described gas cooler low-temperature zone device (5) and described gas cooler high temperature section device (3), after cooling medium in described system to be heated is heated respectively, the cold side outlet by described gas cooler low-temperature zone device (5) and described gas cooler high temperature section device (3) flows back in described system to be heated;
Wherein, described system to be heated comprises: heat regenerative system (8), heat supply network circulation, boiler secondary air air system, described cooling medium is water or air.
4. system as claimed in claim 2 or claim 3, is characterized in that:
The material of described gas cooler low-temperature zone device (5) is acid corrosion-resistant material, comprising: with carbon steel or the fluoroplastics of enamel coating.
5. system as claimed in claim 2 or claim 3, is characterized in that:
The material of described gas cooler high temperature section device (3) comprising: carbon steel or ND steel.
6. system as claimed in claim 2 or claim 3, is characterized in that:
Described gas cooler high temperature section device (3) is fin tube type heat exchanger.
7. system as claimed in claim 6, is characterized in that:
The fin of described fin tube type heat exchanger is H shape.
CN201320335838.7U 2013-06-13 2013-06-13 Boiler smoke waste-heat application system Active CN203489245U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104235825A (en) * 2013-06-13 2014-12-24 烟台龙源电力技术股份有限公司 Boiler flue gas waste heat recycling system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104235825A (en) * 2013-06-13 2014-12-24 烟台龙源电力技术股份有限公司 Boiler flue gas waste heat recycling system

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