CN102767816B - System for lowering exhaust gas temperature of boiler in external-internal combined mode - Google Patents
System for lowering exhaust gas temperature of boiler in external-internal combined mode Download PDFInfo
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- CN102767816B CN102767816B CN201210244593.7A CN201210244593A CN102767816B CN 102767816 B CN102767816 B CN 102767816B CN 201210244593 A CN201210244593 A CN 201210244593A CN 102767816 B CN102767816 B CN 102767816B
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- heat recovery
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- exhaust gas
- boiler
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- 238000011084 recovery Methods 0.000 claims abstract description 67
- 239000002918 waste heat Substances 0.000 claims abstract description 66
- 239000007789 gas Substances 0.000 claims abstract description 48
- 230000009466 transformation Effects 0.000 claims abstract description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 54
- 239000003546 flue gas Substances 0.000 claims description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 230000008676 import Effects 0.000 claims description 8
- 230000003009 desulfurizing effect Effects 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 238000005476 soldering Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000005728 strengthening Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 239000000843 powder Substances 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 235000019504 cigarettes Nutrition 0.000 description 10
- 239000003245 coal Substances 0.000 description 8
- 238000002360 preparation method Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 208000011580 syndromic disease Diseases 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000003306 harvesting Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000002826 coolant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 208000020442 loss of weight Diseases 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
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Abstract
The invention belongs to the technical field of waste heat recycle and in particular discloses a system for lowering exhaust gas temperature of a boiler in an external-internal combined mode. The system for lowing the exhaust gas temperature of the boiler in the external-internal combined mode comprises four systems the energy saving quantities of which are coupled and gained mutually, namely an extension transformation high pressure economizer, a trisector rotary air pre-heater, an internal boiler exhaust gas waste heat recovery secondary device and an external boiler exhaust gas waste heat recovery primary device, wherein the extension transformation high pressure economizer, the trisector rotary air pre-heater and the internal boiler exhaust gas waste heat recovery secondary device are waste heat recovery systems acting on inside the boiler, have the highest energy-using energy level, and the largest exhaust gas temperature lowering range is allocated; and the external boiler exhaust gas waste heat recovery primary device is an exhaust gas waste heat recovery which acts outside the boiler, has a low energy-using energy level, and remained exhaust gas temperature lowering is allocated to the external boiler exhaust gas waste heat recovery primary device. The system for lowering the exhaust gas temperature of the boiler in the external-internal combined mode coordinates heat energy transmission and using processes in the whole boiler and a turbine system, meets requirements and performs gaining in the aspects of boiler heat transmission, powder manufacturing, metal safety and the like, and achieves maximized benefit of waste heat recovery.
Description
(1) technical field
The invention belongs to heat recovery technical field, particularly inside and outside a kind of stove, combine the system reducing exhaust gas temperature.
(2) background technology
The station boiler of wet desulfurization system is installed, the low limit value of exhaust gas temperature that its technique allows is about 85 DEG C, domestic technical scheme and the engineering practice having occurred a collection of deeply reducing exhausted smoke temperature close to this theoretical limit temperature at present, and improve said system at aspects such as heat-transfer matcrial, ash deposits corrosion, SR, amount of energy saving optimizations.
With regard to common situation, all there is the defect that benefit is lower, the scrap build investment payback time is long of additional issue electric work in the system of deeply reducing exhausted smoke temperature, its reason is, be in low cigarette temperature area between the recovery area of (1) fume afterheat, energy level is not high; (2) only pay close attention to the absolute figure that exhaust gas temperature reduces, and do not go to the position distinguishing energy regenerating to be (before air preheater outlet) or stove outer (after air preheater outlet) in stove; (3) not by the tail end of boiler integrally system, consider stove hot blast temperature, pulverized coal preparation system mixes cold wind, preheater leaks out etc. and reduce being coupled between exhaust gas temperature.
(3) summary of the invention
The present invention, in order to make up the deficiencies in the prior art, provides inside and outside simple, the energy-saving and cost-reducing stove of a kind of structure and combines the system reducing exhaust gas temperature.
The present invention is achieved through the following technical solutions:
The system reducing exhaust gas temperature is combined inside and outside a kind of stove, comprise the economizer be arranged on exhaust gases passes, it is characterized in that: described economizer is for extending transformation high-pressure economizer, the exhaust gases passes of the outlet trisector air heater of economizer, the exhanst gas outlet of trisector air heater connects the outer flue gas waste heat recovery further device of stove, the outer flue gas waste heat recovery further device of stove is communicated with inner flue gas of the stove waste heat recovery secondary device by electric cleaner, inner flue gas of the stove waste heat recovery secondary device is communicated with the second inner flue gas of the stove waste heat recovery secondary device by the chilled water pipeline being provided with water circulating pump, the air outlet slit of the second inner flue gas of the stove waste heat recovery secondary device is communicated with the air duct of the second trisector air heater.
The present invention includes the system of four amount of energy saving gains coupled to each other: extend the outer flue gas waste heat recovery further device of transformation high-pressure economizer, trisector air heater, inner flue gas of the stove waste heat recovery secondary device and stove, wherein, former three is the residual neat recovering system acted in stove, the energy level of its Energy harvesting is the highest, maximum exhaust gas temperature should be distributed and reduce amplitude, last system is the residual neat recovering system acted on outside stove, the rank of its Energy harvesting is lower, only distributes remaining exhaust gas temperature and reduces.
In the present invention, air preheater independent design, to recover or to surmount exhaust gas temperature design load for feature; Economizer is by the effect of two kinds of mode gain air preheaters, one is reduce air preheater import cigarette temperature, directly exhaust gas temperature is reduced by function passes, two is suppress preheater outlet hot blast temperature elevation amplitude, pulverized coal preparation system is avoided to mix cold wind, increase the air quantity in a organized way of preheater, indirectly reduce exhaust gas temperature; The effect of the outer flue gas waste heat recovery further device of inner flue gas of the stove waste heat recovery secondary device loss of weight three kinds of mode gain economizers, air preheater and stoves, one is improve air preheater import wind-warm syndrome and preheater outlet wind-warm syndrome, expand the cooling space of economizer, two is larger lifting preheater outlet cigarette temperature, the outer flue gas waste heat recovery further device of stove is made to obtain the design environment of high level utilization, three is improve air preheater tube wall temperature, mitigate corrosion dust stratification, preheater outlet cigarette temperature is reduced, the effect of gain air preheater with prolonged way.
More excellent scheme of the present invention is:
The outer flue gas waste heat recovery further device of described stove is communicated with the steam turbine low-pressure heater installing condensate pump, and is provided with control valve on connecting pipe, changes the gentle power increment of the condensate water returning steamer pusher side by control valve.
In described stove, the exhanst gas outlet of waste heat off-gas recovery secondary device is communicated with desulfurizing tower, and the air intlet of the second inner flue gas of the stove waste heat recovery secondary device is communicated with boiler secondary blower fan with boiler primary air fan respectively.
The described primary structure extending transformation high-pressure economizer is helical fin or the H type fin of light pipe pipeloop and the expansion unit space heating surface increased, and the suitable cigarette temperature drop amplitude of economizer is determined according to the Calculation of Heat Transfer of air preheater.
The primary structure of described trisector air heater and the second trisector air heater is the current equalizer optimizing the heat accumulating element of waveform, the hot junction height of increase and preheater import, and its performance is subject to the impact of inner flue gas of the stove waste heat recovery secondary device heat power.
The primary structure of the outer flue gas waste heat recovery further device of described stove is soldering nickel-base seeping layer sawtooth strengthening spiral fin coil.
The primary structure of described inner flue gas of the stove waste heat recovery secondary device and the second inner flue gas of the stove waste heat recovery secondary device is the embedded spiral fin coil of steel combined with aluminum, and middle refrigerant water pipe and water circulating pump form heat medium water closed circuit between stream oriented device.
Boiler tail is integrally considered as a whole the reduction of exhaust gas temperature by the present invention, and adhere to principled is taken as the leading factor to reduce exhaust gas temperature in stove, combines reduction exhaust gas temperature, realize the degree of depth energy-conservation inside and outside stove.Under this principle, coordinate the heat energy transmission in whole boiler, turbine system, utilize process, and each side such as boiler heat-transfer, powder process, metallic airbag requires and gain, realizes the maximizing the benefits of waste heat recovery.
Air preheater import wind-warm syndrome is increased to 50/40 DEG C (summer/winter) by native system, stove outer flue gas waste heat recovery further device outlet cigarette temperature drop is low to moderate 125 ~ 130 DEG C, inner flue gas of the stove waste heat recovery secondary device outlet cigarette temperature drop is low to moderate 90 ~ 100 DEG C, to change front exhaust gas temperature 150 DEG C, unit coal consumption of power supply 6 ~ 8g/kwh can be reduced.
(4) accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Fig. 1 is structural representation of the present invention.
In figure, 1 economizer, 2 trisector air heaters, 3 second trisector air heaters, 4 inner flue gas of the stove waste heat recovery secondary devices, 5 second inner flue gas of the stove waste heat recovery secondary devices, the outer flue gas waste heat recovery further device of 6 stoves, 7 electric cleaners, 8 water circulating pumps, 9 boiler primary air fans, 10 boiler secondary blower fans, 11 desulfurizing towers, 12 steam turbine low-pressure heaters, 13 condensate pumps, 14 control valves, 15 chilled water pipelines, JD1-5 node 1-5.
(5) detailed description of the invention
Accompanying drawing is a kind of specific embodiment of the present invention.This embodiment comprises the economizer 1 be arranged on exhaust gases passes, described economizer 1 is for extending transformation high-pressure economizer 1, the exhaust gases passes of the outlet trisector air heater 2 of economizer 1, the exhanst gas outlet of trisector air heater 2 connects the outer flue gas waste heat recovery further device 6 of stove, the outer flue gas waste heat recovery further device 6 of stove is communicated with inner flue gas of the stove waste heat recovery secondary device 4 by electric cleaner 7, inner flue gas of the stove waste heat recovery secondary device 4 is communicated with the second inner flue gas of the stove waste heat recovery secondary device 7 by the chilled water pipeline 15 being provided with water circulating pump 8, the air outlet slit of the second inner flue gas of the stove waste heat recovery secondary device 5 is communicated with the air duct of the second trisector air heater 3, the outer flue gas waste heat recovery further device 6 of described stove is communicated with the steam turbine low-pressure heater 12 installing condensate pump 13, and on connecting pipe, be provided with control valve 14, in described stove, the air intlet of exhanst gas outlet connection desulfurizing tower 11, the second inner flue gas of the stove waste heat recovery secondary device 5 of waste heat off-gas recovery secondary device 4 is communicated with boiler secondary blower fan 10 with boiler primary air fan 9 respectively, the described primary structure extending transformation high-pressure economizer 1 is helical fin or the H type fin of light pipe pipeloop and the expansion unit space heating surface increased, the primary structure of described trisector air heater 2 and the second trisector air heater 3 is the current equalizer optimizing the heat accumulating element of waveform, the hot junction height of increase and preheater import, the primary structure of the outer flue gas waste heat recovery further device 6 of described stove is soldering nickel-base seeping layer sawtooth strengthening spiral fin coil, the primary structure of described inner flue gas of the stove waste heat recovery secondary device 4 and the second inner flue gas of the stove waste heat recovery secondary device 5 is the embedded spiral fin coil of steel combined with aluminum.
Arrange the outer flue gas waste heat recovery further device 6 of stove at the inlet flue duct of electric cleaner 7, its cooling medium is the main condensate of Steam Turbine Regenerative System 12, and control valve 14 crosses streamflow for the outer flue gas waste heat recovery further device 6 of regulating stove; The function reducing exhaust gas temperature in stove completes by the high-pressure economizer 1 extended through heating surface or expand with through two trisector air heaters 2,3 of heat accumulating element increase-volume, and the second trisector air heater 3 accepts the coupling of the second inner flue gas of the stove waste heat recovery secondary device 5 at node 3; The cold wind incorporation of pulverized coal preparation system accepts at node 4 coupling extending economizer 1; The heat exchange power sum of the outer flue gas waste heat recovery further device 6 of stove and the second inner flue gas of the stove waste heat recovery secondary device 5 is determined with the heat exchange power increment of dilatation air preheater 2 by the import cigarette temperature of inner flue gas of the stove waste heat recovery secondary device 4, the outlet cigarette temperature of the second inner flue gas of the stove waste heat recovery secondary device 5 and extension economizer 1.
This example is in extension economizer 1 import cigarette temperature 150 DEG C of situations, and acquisition thermal parameter and economic index change as follows: node 1:-11 DEG C, node 2;-0.92 DEG C, node 3:+33.9 DEG C, node 4; + 16.6 DEG C; Node 5:-50 DEG C.System reduces pulverized coal preparation system and mixes 1.5 percentage points, cold wind, reduce exhaust gas temperature 50 DEG C, wherein reduce by 27.07 DEG C (by economizer 1, second trisector air heater 3 and second inner flue gas of the stove waste heat recovery secondary device 5) in stove, stove reduces outward 22.93 DEG C (by the outer flue gas waste heat recovery further device 6 of stove).Reduce coal consumption of power supply 4.76g/kwh in stove, stove reduces coal consumption of power supply 1.74g/kwh outward, and it is 6.51g/kwh that whole system reduces coal consumption of power supply.
The parameter variation range of each node of native system (with " JD " mark in accompanying drawing): node 1:-10 DEG C ~-30 DEG C, node 2;-5 DEG C ~+5 DEG C, node 3:+40 DEG C ~+50 DEG C, node 4; + 5 DEG C ~+20 DEG C; Node 5:-50 DEG C ~-60 DEG C.
Claims (5)
1. inside and outside a stove, combine the system reducing exhaust gas temperature, comprise the economizer (1) be arranged on exhaust gases passes, it is characterized in that: described economizer (1) is for extending transformation high-pressure economizer (1), the exhaust gases passes of the outlet trisector air heater (2) of economizer (1), the exhanst gas outlet of trisector air heater (2) connects the outer flue gas waste heat recovery further device (6) of stove, the outer flue gas waste heat recovery further device (6) of stove is communicated with inner flue gas of the stove waste heat recovery secondary device (4) by electric cleaner (7), inner flue gas of the stove waste heat recovery secondary device (4) is communicated with the second inner flue gas of the stove waste heat recovery secondary device (5) by the chilled water pipeline (15) being provided with water circulating pump (8), the air outlet slit of the second inner flue gas of the stove waste heat recovery secondary device (5) is communicated with the air duct of the second trisector air heater (3), the outer flue gas waste heat recovery further device (6) of described stove is communicated with the steam turbine low-pressure heater (12) installing condensate pump (13), and on connecting pipe, be provided with control valve (14), the primary structure of described trisector air heater (2) and the second trisector air heater (3) is the current equalizer optimizing the heat accumulating element of waveform, the hot junction height of increase and preheater import.
2. inside and outside stove according to claim 1, combine the system reducing exhaust gas temperature, it is characterized in that: the exhanst gas outlet of described inner flue gas of the stove waste heat recovery secondary device (4) is communicated with desulfurizing tower (11), and the air intlet of the second inner flue gas of the stove waste heat recovery secondary device (5) is communicated with boiler secondary blower fan (10) with boiler primary air fan (9) respectively.
3. combine the system reducing exhaust gas temperature inside and outside stove according to claim 1, it is characterized in that: the described primary structure extending transformation high-pressure economizer (1) is helical fin or the H type fin of light pipe pipeloop and the expansion unit space heating surface increased.
4. combine the system reducing exhaust gas temperature inside and outside stove according to claim 1, it is characterized in that: the primary structure of the outer flue gas waste heat recovery further device (6) of described stove is soldering nickel-base seeping layer sawtooth strengthening spiral fin coil.
5. combine the system reducing exhaust gas temperature inside and outside stove according to claim 1, it is characterized in that: the primary structure of described inner flue gas of the stove waste heat recovery secondary device (4) and the second inner flue gas of the stove waste heat recovery secondary device (5) is the embedded spiral fin coil of steel combined with aluminum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210244593.7A CN102767816B (en) | 2012-07-16 | 2012-07-16 | System for lowering exhaust gas temperature of boiler in external-internal combined mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210244593.7A CN102767816B (en) | 2012-07-16 | 2012-07-16 | System for lowering exhaust gas temperature of boiler in external-internal combined mode |
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| Publication Number | Publication Date |
|---|---|
| CN102767816A CN102767816A (en) | 2012-11-07 |
| CN102767816B true CN102767816B (en) | 2015-07-08 |
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| CN201210244593.7A Active CN102767816B (en) | 2012-07-16 | 2012-07-16 | System for lowering exhaust gas temperature of boiler in external-internal combined mode |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102401393A (en) * | 2010-09-07 | 2012-04-04 | 上海成信建业节能科技有限公司 | Exhaust waste heat recycling system of power plant boiler |
| CN102425805A (en) * | 2011-11-22 | 2012-04-25 | 孙德义 | Air change and fresh air heating system of boiler house |
| CN202328136U (en) * | 2011-12-06 | 2012-07-11 | 山西蓝天环保设备有限公司 | Oil-field steam injection boiler taking pulverized coal as fuel |
| CN202675248U (en) * | 2012-07-16 | 2013-01-16 | 山东泓奥电力科技有限公司 | System for simultaneously lowering furnace exhaust gas temperature inside and outside furnace |
-
2012
- 2012-07-16 CN CN201210244593.7A patent/CN102767816B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102401393A (en) * | 2010-09-07 | 2012-04-04 | 上海成信建业节能科技有限公司 | Exhaust waste heat recycling system of power plant boiler |
| CN102425805A (en) * | 2011-11-22 | 2012-04-25 | 孙德义 | Air change and fresh air heating system of boiler house |
| CN202328136U (en) * | 2011-12-06 | 2012-07-11 | 山西蓝天环保设备有限公司 | Oil-field steam injection boiler taking pulverized coal as fuel |
| CN202675248U (en) * | 2012-07-16 | 2013-01-16 | 山东泓奥电力科技有限公司 | System for simultaneously lowering furnace exhaust gas temperature inside and outside furnace |
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| CN102767816A (en) | 2012-11-07 |
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