CN202432505U - Flue gas waste heat recovery utilization system of coal burning boiler - Google Patents
Flue gas waste heat recovery utilization system of coal burning boiler Download PDFInfo
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- CN202432505U CN202432505U CN2012200286471U CN201220028647U CN202432505U CN 202432505 U CN202432505 U CN 202432505U CN 2012200286471 U CN2012200286471 U CN 2012200286471U CN 201220028647 U CN201220028647 U CN 201220028647U CN 202432505 U CN202432505 U CN 202432505U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The utility model discloses a flue gas waste heat recovery utilization system of a coal burning boiler. The flue gas waste heat recovery utilization system is characterized in that an economizer is divided into a main economizer and a bypass economizer which are connected in parallel and arranged between a smoke outlet and a deduster, and an air preheater connected with a secondary air outlet of a fan is arranged on the main economizer; the bypass economizer is provided with a feedwater heat exchanger and a condensed water heat exchanger in sequence along a smoke flowing direction, and the feedwater heat exchanger is connected in parallel with any high pressure heater; and the condensed water heat exchanger is connected in parallel with any low pressure heater, and a closed-circulation cold air heat exchanger connected to a cold air heat exchanger at the secondary air outlet of the fan is arranged between a draught fan and a desulfuration absorbing tower. The flue gas waste heat recovery utilization system provided by the utility model can utilize high-quality heat and low-quality heat respectively in different ways according to an energy step utilization principle, thus improving the heat recovery rate in the smoke, and achieving the energy saving and emission reduction effects.
Description
Technical field
The utility model relates to a kind of big-and-middle thermal power plant flue gas system, a kind of specifically fire coal boiler fume heat recovery system.
Background technology
To the thermal power plant, maximum is heat loss due to exhaust gas in the boiler heat loss.In general, l0 ℃ of the every reduction of exhaust gas temperature, boiler thermal output improves about 0.5% to 0.6%.Therefore, boiler exhaust gas is the residual heat resources that potentiality are very big.Usually; The flue gas of boiler is discharged through economizer, air preheater, deduster, air-introduced machine, desulfuration absorbing tower to chimney successively; Heat energy in the boiler smoke carries out preheating except utilizing air preheater to the primary and secondary air that gets into boiler; Heat energy is most of by empty row, causes great heat-energy losses.On the other hand, Boiler Steam exports steam turbine rear drive generator for electricity generation to, the defeated boiler of getting back to of the steam after steam turbine will do work through heat regenerative system.Heat regenerative system comprises the heater of condenser and a plurality of series connection; Condenser is connected between the heater of steam turbine and head end, and the heater of tail end connects boiler, and each heater also connects the end that draws gas of steam turbine respectively; The heater of front end is a low-pressure heater, and the heater of tail end is a high-pressure heater.Be connected with feed pump and oxygen-eliminating device between low-pressure heater and the high-pressure heater.
At present, cancelled flue gas heat exchange device system in the flue gas system of newly-built large-scale thermal power machine group mostly, the flue-gas temperature that gets into desulphurization system is higher, is generally about 130 ℃, and the brown coal unit possibly reach 145 ℃.But for sulfur removal technology reaches best operating temperature, flue-gas temperature requires to remain on 80 ℃～90 ℃.Many newly-built desulphurization systems take to be provided with spraying cooling system usually, to lower the temperature of flue gas.But the temperature difference of tens degree is containing huge heat between the flue-gas temperature of entering desulphurization system and the best desulfurization operating temperature, and waste very unfortunately like this.
In the last few years, vigorously advocated in country under the overall situation of " energy-saving and emission-reduction " and " energy cascade utilization " policy, domestic some power plant successfully design and installation the flue gas waste heat recovery use device, bring good economic benefits to power plant.At present, the direction of utilizing of fume afterheat mainly can be divided into warm-up combustion-supporting air, heating hot net water, condensate etc.
1, the steam air heater of water-water heat exchange substitutes conventional steam steam air heater; Be heating agent promptly with a recirculated water; To discharge at the heat that fume side absorbs to first and second cold wind that gets into boiler, the cold wind before the entering air preheater preheated, to reduce conventional steam steam air heater auxiliary steam consumption.
2, anticorrosion tubular type heat exchanger is installed, is used for heating the water-heating system heat supply network recirculated water of factory building or plant area, substitute conventional heat exchangers for district heating with alternative or part, thereby the heating steam amount of having saved heat exchangers for district heating has increased generated energy.
3, utilize the waste heat heat-setting water of flue gas, be used for improving the thermal efficiency of full factory, reduce coal consumption, increase power generating capacity.The mode of heating mainly contains two: the one, and direct mode of heating is promptly installed the flue gas bleeder heater, makes flue gas and condensate directly carry out heat exchange; The 2nd, the indirect mode is promptly installed flue gas bleeder heater and water water-to-water heat exchanger, makes flue gas in enclosed water and flue gas bleeder heater, carry out heat exchange; Enclosed water behind the absorption fume afterheat gets in the water water-to-water heat exchanger and carries out heat exchange with condensate, and then brings heat into main condensate water system.But because the exhaust gas temperature of domestic boiler generally between 120～150 ℃, has limited the position that heated condensate temperature rise and condensate are extracted point out, it is limited in one's ability that the drawing gas of the steam turbine that is squeezed done work.
The utility model content
The utility model technical issues that need to address provide the high fire coal boiler fume heat recovery system of a kind of heat energy utilization rate.
For solving the problems of the technologies described above, the technical scheme that the utility model adopted is:
Fire coal boiler fume heat recovery system; Comprise boiler; The fume side of boiler is provided with economizer, air preheater, deduster, air-introduced machine, desulfuration absorbing tower in order; The steam side of boiler is provided with low-pressure heater, high-pressure heater, is connected feed pump and oxygen-eliminating device between low-pressure heater and the high-pressure heater
Said economizer is set to parallel connection and is arranged on main economizer and bypass economizer between exhanst gas outlet and the deduster; The air preheater that is connected with the fan outlet place of secondary wind is arranged on the main economizer; Bypass economizer upper edge flue gas circulating direction is provided with to water-to-water heat exchanger, condensate heat exchanger in order; Give the parallelly connected setting with arbitrary high-pressure heater of water-to-water heat exchanger, condensate heat exchanger and the parallel connection of arbitrary low-pressure heater are provided with; The cold wind heat exchanger at the fan outlet place that is connected to secondary wind of closed cycle is set between said air-introduced machine and the desulfuration absorbing tower.
The further improvement of the utility model is: said to water-to-water heat exchanger and the parallelly connected setting of a high-pressure heater that closes on feed pump, said condensate heat exchanger and the parallelly connected setting of a low-pressure heater that closes on oxygen-eliminating device.
The further improvement of the utility model is: said main economizer is 2:1 with the ratio of the cross-sectional area of bypass economizer.
The further improvement of the utility model is: the import of said deduster, the import of desulfuration absorbing tower are provided with the baffle door of regulating flue-gas temperature.
The further improvement of the utility model is: said cold wind heat exchanger comprises gas cooler, steam air heater, and gas cooler is arranged on the desulfuration absorbing tower end, and steam air heater is arranged on the fan outlet place of secondary wind, and gas cooler and steam air heater pass through pipeline connection.
The further improvement of the utility model is: the heating agent of said cold wind heat exchanger is lithium bromide or water.
Because the technological progress of having adopted technique scheme, the utility model to obtain is:
The flue gas waste heat recovery of the utility model utilizes system to be divided into two parts:
First, about 1/3 flue gas directly gets in the bypass economizer without air preheater.The bypass economizer is provided with the condensate heat exchanger and gives water-to-water heat exchanger, and the flue gas in the bypass economizer carries out heat exchange, heat-setting water and feedwater with condensate (through the condensate heat exchanger) and feedwater (through giving water-to-water heat exchanger) respectively.Because feed temperature is high, be restricted for the exhanst gas outlet temperature of water-to-water heat exchanger, in order further to reduce flue-gas temperature, adopted " feedwater "+heat exchange of " condensate " two-stage.For the condensate heat exchanger, the gas approach temperature is high, and the extraction point temperature of condensate is high, can squeeze drawing gas of higher extraction pressure.Adopt the condensate of bypass economizer heated feed water and high temperature section, improved and squeezed that part of acting ability of drawing gas, the flue gas heat utilization efficiency also is improved.
Through the coupling of control bypass economizer flue gas flow and condensate and feedwater flow, make the flue-gas temperature of its outlet identical with the rotary regenerative air preheater outlet, the two-way flue gas converges the back and gets into second portion fume afterheat use device through deduster and air-introduced machine.Second portion fume afterheat use device is to arrange the cold wind heat exchanger in the import of desulfuration absorbing tower, arranges gas cooler in the import of desulfurizing tower, arranges steam air heater at the fan outlet place of secondary wind.The cold wind heat exchanger as heating agent, carries out heat exchange to cold secondary wind and flue gas with lithium bromide (or water etc.).Temperature through flue gas behind the gas cooler is reduced to the desulphurization reaction optimum temperature, and guarantees more than acid dew-point temperature, according to different coals, is controlled at about 90 ℃ to 100 ℃.The cold secondary wind of opposite side gets into rotary regenerative air preheater and heats once more after heating through steam air heater, finally sends into burner hearth.Because the heat of flue gas is changed to cold secondary wind, and is brought into burner hearth, the heat that is equivalent to flue gas is all absorbed by boiler, and Btu utilization efficient reaches the highest.
The utility model has been avoided increasing the drawback of air preheater heat exchange area greatly in order to utilize fume afterheat in the conventional independent heats cold secondary wind scheme.With respect to the independent heat-setting water of flue gas scheme, this utility model has the high advantage of fume afterheat utilization rate.Simultaneously, heat exchangers at different levels all adopt closed cycle in the native system, have improved the security of system.In sum, the utility model is according to the cascaded utilization of energy principle, is used with different approaches respectively for the heat and the more inferior heat of higher quality, improved heat recovery rate in the flue gas, reached the effect of energy-saving and emission-reduction.
The utility model has farthest utilized the heat in the boiler smoke, and the boiler economic effect high for exhaust gas temperature is more obvious.In implementation process, only need when boiler and steam turbine design, directly carry out heat Balance Calculation, and in flue, install the controllable register door additional, two-stage fume afterheat use device can utilize fume afterheat as far as possible, reaches higher economy and environmental benefit.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Wherein, 1, boiler, 2, main economizer, 3, bypass economizer; 4, air preheater, 5, deduster, 6, air-introduced machine, 7, desulfuration absorbing tower; 8, low-pressure heater, 9, oxygen-eliminating device, 10, feed pump, 11, high-pressure heater; 12, give water-to-water heat exchanger, 13, the condensate heat exchanger, 14, the cold wind heat exchanger, 15, baffle door.
The specific embodiment
Below in conjunction with accompanying drawing the utility model is explained further details:
Fire coal boiler fume heat recovery system, as shown in Figure 1, comprise coal-burning boiler 1.The flue side of boiler is provided with economizer, air preheater 4, deduster 5, air-introduced machine 6, desulfuration absorbing tower 7, chimney in order.The steam side of boiler is provided with heat regenerative system, and Boiler Steam exports steam turbine rear drive generator for electricity generation to, the defeated boiler of getting back to of the steam after steam turbine will do work through heat regenerative system.Heat regenerative system comprises the heater of condenser and a plurality of series connection; Condenser is connected between the heater of steam turbine and head end; The heater of tail end connects boiler; Each heater also connects the end that draws gas of steam turbine respectively, and the heater of front end is a low-pressure heater 8, and the heater of tail end is a high-pressure heater 11.Be connected with feed pump 10 and oxygen-eliminating device 9 between low-pressure heater 8 and the high-pressure heater 11.
Said economizer is at two branch roads of exhanst gas outlet, and a branch road is main economizer 2, and to be 3, two branch roads of bypass economizer converged before getting into deduster 5 another branch road is a main road.The ratio of the cross-sectional area of main economizer 2 and bypass economizer 3 is 2:1.Air preheater 4 is arranged on the main economizer 2, and an end of air preheater is connected with the fan outlet place of secondary wind through pipeline, and the other end is connected with the air intake of boiler.Bypass economizer 3 upper edge flue gas circulating directions are provided with two groups of heat exchangers in order; Wherein one group be connected in parallel on high-pressure heater 11 two ends closing on feed pump give water-to-water heat exchanger 12, another group is the condensate heat exchanger 13 that is connected in parallel on low-pressure heater 8 two ends closing on oxygen-eliminating device.Feedwater and condensate are passed through respectively to the flue gas heat exchange in water-to-water heat exchanger 12, condensate heat exchanger 13 and the bypass economizer 3.The cold wind heat exchanger 14 at the fan outlet place that is connected to secondary wind is set between said air-introduced machine 6 and the desulfuration absorbing tower 7.Said cold wind heat exchanger 14 comprises gas cooler, steam air heater, and gas cooler is arranged on desulfuration absorbing tower 7 ends, and steam air heater is arranged on the fan outlet place of secondary wind, and gas cooler and steam air heater pass through pipeline connection.Said cold wind heat exchanger 14 is a closed cycle, and its heating agent is lithium bromide or water.Be provided with the baffle door 15 of regulating flue-gas temperature in the import of deduster 5, the import of desulfuration absorbing tower 7.
Claims (6)
1. fire coal boiler fume heat recovery system; Comprise boiler (1); The fume side of boiler is provided with economizer, air preheater (4), deduster (5), air-introduced machine (6), desulfuration absorbing tower (7) in order; The steam side of boiler is provided with low-pressure heater (8), high-pressure heater (11), is connected feed pump (10) and oxygen-eliminating device (9) between low-pressure heater and the high-pressure heater, it is characterized in that:
Said economizer is set to parallel connection and is arranged on main economizer (2) and bypass economizer (3) between exhanst gas outlet and the deduster (5); The air preheater (4) that is connected with the fan outlet place of secondary wind is arranged on the main economizer (2); Bypass economizer (3) upper edge flue gas circulating direction is provided with to water-to-water heat exchanger (12), condensate heat exchanger (13) in order; Give water-to-water heat exchanger (12) and the parallelly connected setting of arbitrary high-pressure heater (11), condensate heat exchanger (13) and arbitrary low-pressure heater (8) parallel connection are provided with; The cold wind heat exchanger (14) at the fan outlet place that is connected to secondary wind of closed cycle is set between said air-introduced machine (6) and the desulfuration absorbing tower (7).
2. fire coal boiler fume heat recovery according to claim 1 system; It is characterized in that: said to water-to-water heat exchanger (12) and the parallelly connected setting of a high-pressure heater (11) that closes on feed pump (10), said condensate heat exchanger (13) and the parallelly connected setting of a low-pressure heater (8) that closes on oxygen-eliminating device (9).
3. fire coal boiler fume heat recovery according to claim 1 system is characterized in that: said main economizer (2) is 2:1 with the ratio of the cross-sectional area of bypass economizer (3).
4. fire coal boiler fume heat recovery according to claim 1 system is characterized in that: the import of the import of said deduster (5), desulfuration absorbing tower (7) is provided with the baffle door (15) of regulating flue-gas temperature.
5. fire coal boiler fume heat recovery according to claim 1 system; It is characterized in that: said cold wind heat exchanger (14) comprises gas cooler, steam air heater; Gas cooler is arranged on desulfuration absorbing tower (7) end; Steam air heater is arranged on the fan outlet place of secondary wind, and gas cooler and steam air heater pass through pipeline connection.
6. according to each described fire coal boiler fume heat recovery system of claim 1～5, it is characterized in that: the heating agent in the said cold wind heat exchanger (14) is lithium bromide or water.
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| CN2012200286471U CN202432505U (en) | 2012-01-29 | 2012-01-29 | Flue gas waste heat recovery utilization system of coal burning boiler |
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| CN2012200286471U CN202432505U (en) | 2012-01-29 | 2012-01-29 | Flue gas waste heat recovery utilization system of coal burning boiler |
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| CN102839999A (en) * | 2012-09-19 | 2012-12-26 | 山东电力工程咨询院有限公司 | Small steam turbine exhaust steam cold source loss recovery system and method |
| CN103398369A (en) * | 2013-08-05 | 2013-11-20 | 吕克庆 | Method and system for comprehensive utilization of tail heat of boiler |
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| CN106090880A (en) * | 2016-07-21 | 2016-11-09 | 内蒙古京能锡林发电有限公司 | A kind of machine stove set heat circulation afterheat recycling system |
| CN106382619A (en) * | 2016-11-09 | 2017-02-08 | 北京京诚科林环保科技有限公司 | Deep recycling system for gas-fired boiler flue gas waste heat |
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- 2012-01-29 CN CN2012200286471U patent/CN202432505U/en not_active Expired - Lifetime
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Address after: 050031 No. 6 Jianhua Street, Shijiazhuang City, Hebei Province Patentee after: China Electric Power Construction Group Hebei electric survey and Design Research Institute Co., Ltd. Address before: 050031 No. 6 Jianhua Street, Shijiazhuang City, Hebei Province Patentee before: Hebei Province Power Surveying Design & Research Institute |
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Granted publication date: 20120912 |