CN104235825A - Boiler flue gas waste heat recycling system - Google Patents
Boiler flue gas waste heat recycling system Download PDFInfo
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- CN104235825A CN104235825A CN201310230882.6A CN201310230882A CN104235825A CN 104235825 A CN104235825 A CN 104235825A CN 201310230882 A CN201310230882 A CN 201310230882A CN 104235825 A CN104235825 A CN 104235825A
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Abstract
The invention discloses a boiler flue gas waste heat recycling system. The boiler flue gas waste heat recycling system comprises a flue gas cooler high-temperature section device (3) and a flue gas cooler low-temperature section device (5). Flue gas exhausted from the boiler (1) sequentially passes through an air preheater (2), the flue gas cooler high-temperature section device (3) and a desulfurization system (6) and then enters a chimney (7) for being discharged; the flue gas cooler high-temperature section device (3) and the flue gas cooler low-temperature section device can reduce the temperature of the flue gas. According to the boiler flue gas waste heat recycling system, By means of a two-stage flue gas cooler, the waste heat of the flue gas of the boiler can be utilized in a staged mode, so that full energy saving can be achieve, and the problem of corrosion to flue gas coolers in the prior art can be solved, safety and reliability of a waste heat recycling system can be enhanced, the cost can be solved, and the working efficiency of the desulfurization system can be improved.
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.
Prior art installs gas cooler usually between the air preheater of boiler and cleaner, 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 huge economic benefit.Because gas cooler is usually placed in the flue after boiler tail air preheater, being in the section that temperature is lower, is the region that cold end corrosion easily occurs.Thus, need consideration to prevent cold end corrosion in the design of gas cooler, but existing system heat transfer temperature difference is low, the heat of recovery is few, causes certain energy waste.
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, adopts two-stage flue gas cooling device cooled flue gas.
A kind of residual heat from boiler fume utilizes 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 of boiler and cleaner, and described gas cooler low-temperature zone device is arranged in the flue between described cleaner and desulphurization system; Wherein, the flue gas that boiler is discharged, successively through described air preheater, described gas cooler high temperature section device, described cleaner and described gas cooler low-temperature zone device, 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 an embodiment of system of the present invention, further, after described gas cooler high temperature section device, the temperature of flue gas is: higher than flue gas dew point temperature 5 ~ 20 DEG C.
According to an embodiment of system of the present invention, further, after described gas cooler low-temperature zone device, the temperature of flue gas is: be more than or equal to 60 DEG C be less than or equal to 90 DEG C lower than flue gas dew point temperature.
According to an embodiment of system of the present invention, further, the cold-side inlet of described gas cooler low-temperature zone device is connected with system to be heated respectively with the cold side outlet of described gas cooler high temperature section device, and the cold side outlet of described gas cooler low-temperature zone device is connected with the cold-side inlet of described gas cooler high temperature section device; Wherein, cooling medium in system to be heated enters the cold-side 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 medium in described system to be heated, by after post bake, flows back in described system to be heated by the cold side outlet of described gas cooler high temperature section device; Described system to be heated comprises: heat regenerative system, heat supply network circulation, boiler secondary air air system, and described cooling medium is water or air.
According to an embodiment of system of the present invention, further, the cold-side inlet of described gas cooler low-temperature zone device is connected with system to be heated respectively with the cold-side inlet of described gas cooler high temperature section device, further, the cold side outlet of described gas cooler low-temperature zone device is connected with described system to be heated respectively with the cold side outlet of described gas cooler high temperature section device; Wherein, cooling medium in system to be heated enters the cold-side inlet of described gas cooler low-temperature zone device and described gas cooler high temperature section device respectively, after cooling medium in described system to be heated is heated respectively, flow back in described system to be heated by the cold side outlet of described gas cooler low-temperature zone device and described gas cooler high temperature section device; Wherein, described system to be heated comprises: heat regenerative system, heat supply network circulation, boiler secondary air air system, and described cooling medium is water or air.
According to an embodiment of system of the present invention, 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 an embodiment of system of the present invention, further, the material of described gas cooler high temperature section device comprises: carbon steel and ND steel.
According to an embodiment of system of the present invention, further, described gas cooler high temperature section device is fin tube type heat exchanger.
According to an embodiment of system of the present invention, further, the fin of described fin tube type heat exchanger is H type.
Residual heat from boiler fume of the present invention utilizes system, adopt two-stage gas cooler, boiler exhaust gas waste heat is made to obtain cascade utilization, fully energy-conservation, the etching problem of gas cooler of the prior art can be solved, improve the safety and reliability of bootstrap system, and saved cost, improve the operating efficiency of desulphurization system.
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 residual heat from boiler fume of the present invention utilizes an embodiment of 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. 1 is the schematic diagram that residual heat from boiler fume of the present invention 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 of boiler and cleaner 4, 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, successively through air preheater 2, gas cooler high temperature section device 3, cleaner 4 and gas cooler low-temperature zone device 5, 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.
Be sent to chimney 7 through the flue gas of desulphurization system 6 to be discharged, or be sent in the smoke discharging device in boiler combustion system and discharge.
According to one embodiment of present invention, after gas cooler high temperature section device 3, the temperature of flue gas is: higher than flue gas dew point temperature 5 ~ 20 DEG C.After gas cooler low-temperature zone device 5, the temperature of flue gas is: be more than or equal to 60 DEG C be less than or equal to 90 DEG C lower than flue gas dew point temperature.
Flue gas dew point temperature represents will condense lower than the sulfuric acid vapor in flue gas during this temperature, and flue gas dew point temperature is higher than aqueous 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 be transformed by the element sulphur in raw coal, therefore in general, in raw coal, the content of sulphur is higher, and flue gas dew point temperature is also higher.
According to one embodiment of present invention, from boiler air preheater 2 high-temperature flue gas out, Hot gas turbine condensate water is added through gas cooler high temperature section device 5, to reduce on exhaust gas temperature to flue gas dew point 5 ~ 20 DEG C, then deduster 4 dedusting is entered, then enter gas cooler low-temperature zone device 5 to continue to add Hot gas turbine condensate water, reduce exhaust gas temperature to the best desulfurization operating temperature about 80 DEG C of desulphurization system, make desulfuration efficiency higher, flue gas enters desulfurizing tower 6 desulfurization subsequently, discharges finally by chimney 7.
According to one embodiment of present invention, cooling water in system to be heated enters the water inlet of gas cooler low-temperature zone device 5, flow through gas cooler low-temperature zone device 5 and gas cooler high temperature section device 3 successively, steam turbine condensate water, by after post bake, is flowed back in system to be heated by the delivery port of gas cooler high temperature section device 3.Cold-side inlet in the present invention is the entrance of the cooling medium needing 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 system, boiler secondary air air systems etc., utilize the heat in flue gas as all or part of thermal source of system.
In gas cooler high temperature section device 3, water can be heat regenerative system 8, heat supply network circulation, other low-pressure heater outlets etc. by the remittance point after heating, and can consider according to actual conditions.
The water entering gas cooler low-temperature zone 5 not only can choose the condensate water of condenser outlet, also can be low-pressure heater inlet water at different levels shunting.Fume afterheat drying brown coal, heating chemical moisturizing or heating heat supply network recirculated water can also carry out heat supply etc., can be used in conjunction with the actual conditions of power plant.
Such as, the water inlet of gas cooler low-temperature zone device 5 is connected with heat regenerative system 8 respectively with the delivery port of gas cooler high temperature section device 3, 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, flow through gas cooler low-temperature zone device 5 and gas cooler high temperature section device 3 successively, steam turbine condensate water is first heated up by flue gas through gas cooler low-temperature zone device 5, then flow out and enter gas cooler high temperature section device 3 from gas cooler low-temperature zone device 5 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.
To be connected with power plant heat regenerative system 8 by gas cooler high temperature section and gas cooler low-temperature zone and to add the condensate water of Hot gas turbine, will squeeze steam turbine regenerative steam after condensed water absorption waste heat, the steam of exclusion enters steam turbine acting, realizes the energy-saving and cost-reducing of power plant.Steam turbine condensate water enters gas cooler high temperature section and low pressure stage respectively, 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, decreases extracted steam from turbine, improve unit efficiency.
According to one embodiment of present invention, adopt two-stage gas cooler, reduce below exhaust gas temperature to flue gas dew point, boiler exhaust gas waste heat can be made to obtain cascade utilization, fully energy-conservation.In addition, the invention solves the etching problem of gas cooler of the prior art, improve the safety and reliability of bootstrap system.
According to one embodiment of present invention, two-stage gas cooler also can adopt mode of heating in parallel.The cold-side inlet of gas cooler low-temperature zone device 5 is connected with system to be heated respectively with the cold-side inlet of gas cooler high temperature section device 3, further, the cold side outlet of gas cooler low-temperature zone device 5 is connected with system to be heated respectively with the cold side outlet of gas cooler high temperature section device 3;
Cooling medium in system to be heated enters the cold-side inlet of gas cooler low-temperature zone device 5 and gas cooler high temperature section device 3 respectively, after cooling medium in system to be heated is heated respectively, flowed back in system to be heated by the cold side outlet of gas cooler low-temperature zone device 5 and gas cooler high temperature section device 3.System to be heated comprises: heat regenerative system 8, heat supply network circulation, boiler secondary air air system, and cooling medium is water or air.
According to one embodiment of present invention, 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.Also can be connected by pipeline between air preheater 2, gas cooler high temperature section device 3, gas cooler low-temperature zone device 5 and desulphurization system 6 etc.
According to one embodiment of present invention, further, the material of gas cooler low-temperature zone device 5 adopts acid corrosion-resistant material, such as: 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 type.The extended surface of finned tube amasss 5-7 times that can reach light pipe, can save arrangement space and save weight metal and reduce cost, can also reduce ash cutting.H type 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 soot particle parallel with air-flow flow direction can not precipitate on fin, the blocking of smoke flow channels can not occur, and antiwear property is strong.
Residual heat from boiler fume of the present invention utilizes system, adopts two-stage gas cooler, makes boiler exhaust gas waste heat obtain cascade utilization, can reduce below exhaust gas temperature to flue gas dew point, reduce exhaust gas temperature greatly, reclaims smoke discharging residual heat, fully energy-conservation; Solve the etching problem of gas cooler of the prior art, improve the safety and reliability of bootstrap system.Gas cooler also resistance to wears, without dust stratification, resistance is low simultaneously; Two-stage flue gas cooling device chooses different materials according to the height of flue-gas temperature, on the basis ensureing security of system and reliability, has saved cost; The optimum working temperature of exhaust gas temperature to desulphurization system can be reduced, improve the operating efficiency of desulphurization system.
Claims (9)
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) of boiler and cleaner (4), and described gas cooler low-temperature zone device (5) is arranged in the flue between described cleaner (4) and desulphurization system (6);
Wherein, the flue gas that boiler (1) is discharged, successively 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), 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:
After described gas cooler high temperature section device (3), the temperature of flue gas is: higher than flue gas dew point temperature 5 ~ 20 DEG C.
3. system as claimed in claim 2, is characterized in that:
After described gas cooler low-temperature zone device (5), the temperature of flue gas is: be more than or equal to 60 DEG C be less than or equal to 90 DEG C lower than flue gas dew point temperature.
4. system as claimed in claim 3, is characterized in that:
The cold-side inlet of described gas cooler low-temperature zone device (5) is connected with system to be heated respectively with the cold side outlet of described gas cooler high temperature section device (3), and the cold side outlet of described gas cooler low-temperature zone device (5) is connected with the cold-side inlet of described gas cooler high temperature section device (3);
Wherein, cooling medium in system to be heated enters the cold-side inlet of described gas cooler low-temperature zone device (5), flow through described gas cooler low-temperature zone device (5) and described gas cooler high temperature section device (3) successively, cooling medium in described system to be heated, by after post bake, flows back in described system to be heated by the cold side outlet of described gas cooler high temperature section device (3); Described system to be heated comprises: heat regenerative system (8), heat supply network circulation, boiler secondary air air system, and described cooling medium is water or air.
5. system as claimed in claim 3, is characterized in that:
The cold-side inlet of described gas cooler low-temperature zone device (5) is connected with system to be heated respectively with the cold-side inlet of described gas cooler high temperature section device (3), further, the cold side outlet of described gas cooler low-temperature zone device (5) is connected with described system to be heated respectively with the cold side outlet of described gas cooler high temperature section device (3);
Wherein, cooling medium in system to be heated enters the cold-side inlet of described gas cooler low-temperature zone device (5) and described gas cooler high temperature section device (3) respectively, after cooling medium in described system to be heated is heated respectively, flow back in described system to be heated by the cold side outlet of described gas cooler low-temperature zone device (5) and described gas cooler high temperature section device (3);
Wherein, described system to be heated comprises: heat regenerative system (8), heat supply network circulation, boiler secondary air air system, and described cooling medium is water or air.
6. the system as described in claim 4 or 5, 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.
7. the system as described in claim 4 or 5, is characterized in that:
The material of described gas cooler high temperature section device (3) comprising: carbon steel and ND steel.
8. the system as described in claim 4 or 5, is characterized in that:
Described gas cooler high temperature section device (3) is fin tube type heat exchanger.
9. system as claimed in claim 8, is characterized in that:
The fin of described fin tube type heat exchanger is H type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310230882.6A CN104235825A (en) | 2013-06-13 | 2013-06-13 | Boiler flue gas waste heat recycling system |
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| CN201310230882.6A CN104235825A (en) | 2013-06-13 | 2013-06-13 | Boiler flue gas waste heat recycling system |
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| CN201310230882.6A Pending CN104235825A (en) | 2013-06-13 | 2013-06-13 | Boiler flue gas waste heat recycling system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104949089A (en) * | 2015-07-02 | 2015-09-30 | 淄博英诺威圣节能科技有限公司 | Building ceramic wet material drying process |
| CN105056551A (en) * | 2015-08-05 | 2015-11-18 | 安徽大别山科技开发有限公司 | Novel cooling steam supply equipment |
| CN105135468A (en) * | 2015-09-29 | 2015-12-09 | 国网浙江省电力公司电力科学研究院 | Smoke waste heat utilization system |
| CN109305737A (en) * | 2018-09-03 | 2019-02-05 | 清华大学 | A kind of desulfurization water zero discharge and high-purity sodium chloride extracting method based on thermal method |
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| CN109305737A (en) * | 2018-09-03 | 2019-02-05 | 清华大学 | A kind of desulfurization water zero discharge and high-purity sodium chloride extracting method based on thermal method |
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