CN204717729U - CFBB deslagging bootstrap system - Google Patents

CFBB deslagging bootstrap system Download PDF

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Publication number
CN204717729U
CN204717729U CN201520462922.4U CN201520462922U CN204717729U CN 204717729 U CN204717729 U CN 204717729U CN 201520462922 U CN201520462922 U CN 201520462922U CN 204717729 U CN204717729 U CN 204717729U
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China
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heat
deslagging
bootstrap
boiler
water
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CN201520462922.4U
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李少华
彭红文
袁雄俊
刘利
李仁�
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North China Power Engineering Co Ltd of China Power Engineering Consulting Group
North China Power Engineering Beijing Co Ltd
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North China Power Engineering Co Ltd of China Power Engineering Consulting Group
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/34Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Abstract

A kind of CFBB deslagging bootstrap system of the present utility model, comprise boiler, slag cooler, steam air heater, heat medium water loop and smoke evacuation system, smoke evacuation system comprises air preheater, flue gas-condensate water heat-exchange system can also be comprised, by slag cooler, steam air heater, heat medium water loop and air preheater, waste residue waste heat is recycled, and the flue gas-smoke discharging residual heat of condensate water heat-exchange system to smoke evacuation system recycles, thus improve the thermal efficiency, the coal consumption of attenuating unit of boiler.

Description

CFBB deslagging bootstrap system
Technical field
The utility model belongs to energy-saving and emission-reduction field, relates to a kind of large circulating fluidized bed boiler power station and effectively improves boiler efficiency, reduces the system of unit coal consumption and pollutant emission.
Background technology
In recent years, reduce discharging the guidance of policy at national energy-saving under, recirculating fluidized bed station boiler obtains increasing application.Nearly 2 years, recirculating fluidized bed new-built unit was supercritical parameter substantially, and 600MW grade Domestic Supercritical CFBB also puts into operation.But, because the waste residue physical thermal loss of CFBB is higher than coal-powder boiler, so CFB Boiler Efficiency is lower than coal-powder boiler.
The big-and-middle-sized Circulating Fluidized Bed Boilers of China adopts roller slag cooler that deslagging temperature is down to less than 150 DEG C, to facilitate the transport process of end slag from bed temperature (850 ~ 900 DEG C) mostly.In early days, power plant's many uses closed-up water as the cooling medium of roller slag cooler, deslagging heat total loss.At present, the condensate water in most power plant use therrmodynamic system, as the cooling medium of roller slag cooler, cools end slag.The waste heat of end slag can be passed to condensate water by this method, and after condensed water absorption deslagging waste heat, squeezed originally being used for the part of heat-setting water and drawing gas, this part steam to continue to do work in steam turbine, thus has reclaimed partial discharge waste heat.But its most of heat of this part steam of exclusion all enters condenser, adds cold source energy, so waste heat recovery efficiency is lower, generally not higher than 20%.
How effectively utilizing end slag to discharge the amount of heat taken out of, is current application cycle fluidized-bed combustion boiler problem demanding prompt solution.
Utility model content
Namely solved technical problem of the present utility model is providing one more effectively to utilize deslagging waste heat, improves the CFBB deslagging bootstrap system of Circulating Fluidized Bed Boilers efficiency, reduction coal consumption, the discharge of decreasing pollution thing.
The technological means that the utility model adopts is as described below.
A kind of CFBB deslagging bootstrap system, include boiler, boiler has deslagging end and smoke evacuation end, this smoke evacuation end connects smoke evacuation system, comprises the air preheater be connected with boiler, also comprise slag cooler and steam air heater in smoke evacuation system, the deslagging end of described boiler connects slag cooler, described air preheater connects steam air heater, and also comprise the heat medium water loop formed by slag cooler and steam air heater, slag cooler and steam air heater carry out exchange heat by heat medium water loop.
Described heat medium water loop arranges water pump, water supplement port and overflowing water port.
Described heat medium water loop is connected with water tank.
Described smoke evacuation system comprises the deduster, air-introduced machine, desulfuration absorbing tower and the chimney that are connected successively, and deduster connects described air preheater.
Also comprise flue gas-condensate water heat-exchange system, this flue gas-condensate water heat-exchange system arranges at least 1 cigarette cooler, and it is located in described smoke evacuation system.When employing 1 cigarette cooler, before this cigarette cooler can be placed in deduster, or before being placed in desulfuration absorbing tower.When employing 2 cigarette coolers, before it is located at deduster respectively and before desulfuration absorbing tower.2 described cigarette coolers can form a condensate circuit jointly, or form respective condensate circuit respectively.
The beneficial effect that the utility model produces is as follows.
1, the utility model is by the design of deslagging waste heat circulation formula utilization, and waste residue waste heat finally gets back to boiler furnace with hot blast, is all utilized by boiler, and the utilization rate of heat is effectively improved, and the waste residue physical thermal loss of boiler reduces greatly.
2, in the utility model, exhaust gas temperature raises to some extent, and the efficiency of boiler is still improved.Exhaust gas temperature rises the thermal loss brought, and by the recovery utilizing condensate water or other media that need heat to carry out heat in back-end ductwork, improves generatine set heat efficiency further.
3, the utility model improves the efficiency of unit waste residue UTILIZATION OF VESIDUAL HEAT IN, in actual applications, compared with adopting the closed-up water type of cooling with roller slag cooler, can reduce unit mark coal consumption about 4g/kW.h.Compared with adopting the condensate water type of cooling with roller slag cooler, unit mark coal consumption about 2g/kW.h can be reduced.Utilize in conjunction with fume afterheat, also can reduce unit mark coal consumption 1 ~ 2g/kW.h further.
4, in heat medium water loop of the present utility model, water pump provides power for heat medium water loop.During unit load change, bed drain purge and cold blast rate can change thereupon.Now water pump has two kinds of methods of operation: constant flow runs, and this method of operation is applicable to unit load and changes little situation; Fixed temperature runs, and this method of operation is applicable to the situation that unit load changes greatly.Therefore, arranging water pump can according to different bed drain purge, intake thus change heat medium water flow, to reach best heat exchange efficiency.
5, the steam air heater in the utility model is different from conventional steam air heater: the effect of conventional steam air heater is when cold wind temperature is lower, heating cold wind is to avoid air preheater cold end corrosion, generally run in the winter time, steam air heater in the utility model runs throughout the year, Main Function sends deslagging waste heat back to boiler, also can avoid the cold end corrosion of air preheater simultaneously.
Accompanying drawing explanation
Figure 1A is one of schematic diagram of CFBB deslagging bootstrap system of the present utility model.
Figure 1B is the schematic diagram two of CFBB deslagging bootstrap system of the present utility model.
Fig. 2 A is one of schematic diagram of CFBB deslagging bootstrap system of the present utility model and flue gas-condensate water heat-exchange system connected applications.
Fig. 2 B is the schematic diagram two of CFBB deslagging bootstrap system of the present utility model and flue gas-condensate water heat-exchange system connected applications.
Fig. 2 C is the schematic diagram three of CFBB deslagging bootstrap system of the present utility model and flue gas-condensate water heat-exchange system connected applications.
Detailed description of the invention
A kind of CFBB deslagging bootstrap system of the present utility model, shown in composition graphs 1 and Fig. 2, include boiler 1, this boiler 1 has deslagging end and smoke evacuation end, smoke evacuation end connects smoke evacuation system, comprises the air preheater 5 be connected with boiler in smoke evacuation system.
Of the present utility modelly to focus on, also comprise slag cooler 2 and steam air heater 4.The deslagging end of described boiler 1 connects slag cooler 2, also comprise steam air heater 4, it can be connected with boiler, during use, the outlet hot blast of warm-air drier can directly send boiler (not shown) back to, and the mode of the utility model the best as shown in the figure, warm-air drier is connected with air preheater 5, and the outlet hot blast of steam air heater 4 is by getting back to boiler furnace after air preheater 5 recovery section fume afterheat.
Emphasis of the present utility model also comprises the heat medium water loop by slag cooler and steam air heater, and slag cooler 2 and steam air heater 4 carry out exchange heat by heat medium water loop 3.Heat medium water loop 3 is arranged water pump 30, this water pump 30 provides power for heat medium water loop, and namely during unit load change, bed drain purge and cold blast rate can change thereupon.Now water pump has two kinds of methods of operation: the first, and constant flow runs: the flow not changing heat medium water loop, changes heat medium water temperature.If load variations is comparatively large, heat medium water loop flow is constant, and water temperature changes also comparatively greatly, the safe operation of entail dangers to slag cooler and air preheater.Therefore this method of operation is applicable to unit load and changes little situation.The second, fixed temperature runs, and changes the flow in heat medium water loop, does not change heat medium water temperature.This method of operation is applicable to the situation that unit load changes greatly.Therefore, arranging water pump can according to different bed drain purge, intake thus change heat medium water flow, to reach best heat exchange efficiency.The fixed temperature method of operation of water pump needs to change heat medium water loop flow, and by subsidiary water tank for heat medium water loop provides moisturizing or overflow volume, heat medium water loop 3 as shown in Figure 1 connects water tank 10, and this water tank 10 can also play the effect such as level pressure, exhaust.In addition, also other water systems can be adopted to carry out moisturizing and overflow water adjustment according to actual conditions, heat medium water loop 3 as shown in Figure 2 arranges water pump 30, water supplement port and overflowing water port, by regulating water supplement port valve 33, flow in valve 31 and 34 control loop on overflowing water port valve 32 and heat medium water loop, opening water supplement port valve 33 when heat medium water flow hour is supplemented in heat medium water loop by heat medium water, open overflow water valve 32 when heat medium water flow is large unnecessary heat medium water is discharged, multiple valve with the use of with the result of use making heat medium water loop reach best.
Steam air heater 4 in the utility model is different from conventional steam air heater: the effect of conventional steam air heater is when cold wind temperature is lower, heating cold wind is to avoid air preheater cold end corrosion, generally run in the winter time, steam air heater in the utility model runs throughout the year, Main Function sends deslagging waste heat back to boiler, also can avoid the cold end corrosion of air preheater simultaneously.This warm-air drier 4 can adopt a cold air heating, or adopt secondary cold wind to carry out heat exchange, namely 2 or multiple heat-exchange device is established in warm-air drier, in parallel or the series connection of these 2 or multiple heat-exchange device, it effectively can improve heat recovery rate, this can carry out arranging according to actual conditions for those skilled in the art, be not too much described at this
According to the service condition of reality, can comprise the deduster 6, desulfuration absorbing tower 8 and the chimney 9 that are connected successively in smoke evacuation system, deduster 6 connects described air preheater 5.And in the middle of described boiler 1 and air preheater 5, SCR denitration reactor 11 can be set.Also air-introduced machine 7 can be added in smoke evacuation system in order to help flow of flue gas.The flue gas that boiler produces is by discharging from chimney after the multiple environmental protection treatment of above-mentioned SCR, air preheater, deduster, desulfuration absorbing tower.
Utilize deslagging bootstrap system of the present utility model, enter the deslagging waste heat of boiler furnace with hot blast, all utilized by boiler, the utilization rate of heat effectively improves, the waste residue physical thermal loss of boiler is lowered greatly, even if exhaust gas temperature raises to some extent, boiler efficiency is still improved.Because exhaust gas temperature rises the thermal loss brought, by the recovery utilizing condensate water or other media that need heat to carry out heat in back-end ductwork, improve generatine set heat efficiency further.As shown in Fig. 2 A to 2C, emphasis of the present utility model also comprises flue gas-condensate water heat-exchange system, and this flue gas-condensate water heat-exchange system arranges at least 1 cigarette cooler, and it is located in described smoke evacuation system.When comprising 1 cigarette cooler, before it can be placed in deduster 6, cigarette cooler 121 as shown in Figure 2 A, or before being placed in desulfuration absorbing tower 8, cigarette cooler 122 as shown in Figure 2 B.When comprising 2 cigarette coolers, before it can be located at deduster 6 respectively and before desulfuration absorbing tower 8, cigarette cooler 121 and 122 as that shown in fig. 2 c, two cigarette coolers 121 and 122 form a condensate circuit jointly by the mode of connecting, and also can form independent two condensate circuits respectively with condensate system.
CFBB deslagging bootstrap system of the present utility model can refer to following steps when reality uses.
(1) end slag that boiler 1 is discharged enters slag cooler 2, and with heat medium water loop 3 heat exchange, heat is transferred to heat medium water from end slag, and cooled end slag is discharged from slag cooler 2.Temperatures as high 850 DEG C when slag of the general end is discharged from boiler, is down to 150 DEG C at slag cooler 2 and drains into follow-up slag removing system (not shown) once.
(2) deliver to warm-air drier 4 by absorbing the heat medium water after heat in slag cooler 2, heat is transferred to the cold wind and secondary cold wind that enter from air inlet from heat medium water, cooled heat medium water is got back to slag cooler 2 and again recycled.
(3) in warm-air drier 4, absorb heat and the warm braw that formed enters air preheater 5, after the flue gas that boiler 1 is discharged, entered burner hearth, form recycling of end slag heat.
(4) from boiler 1 discharge flue gas after air preheater 5 heat to warm braw, discharged by smoke evacuation system.
Above-mentioned 4 steps complete melting down of deslagging waste heat and recycle, also carried out heat exchange with smoke evacuation simultaneously, the heat of smoke evacuation is recycled, but also likely cause the rising of exhaust gas temperature, in order to namely head it off reduces final exhaust gas temperature, flue gas-condensate water the heat-exchange system including at least 1 cigarette cooler is set, described cigarette cooler is located in the smoke evacuation system of described step (4), as shown in Figure 2 C, condensate water delivers to cigarette cooler 121 and 122 by condensate pump outlet 13, condensate water is back to condensate system absorb the waste heat of flue gas in cigarette cooler after, recycling of forming section fume afterheat.Also above-mentioned condensate water or other media that need heat can be adopted to carry out the recovery of heat according to actual service condition, improve generatine set heat efficiency further.
The design that the utility model is utilized by above-mentioned deslagging waste heat circulation formula, waste residue waste heat finally gets back to boiler furnace with hot blast, is recycled by boiler, and the utilization rate of heat is effectively improved, and the waste residue physical thermal loss of boiler reduces greatly.
In actual applications, compared with adopting the closed-up water type of cooling with roller slag cooler, unit mark coal consumption about 4g/kW.h can be reduced.Compared with adopting the condensate water type of cooling with roller slag cooler, unit mark coal consumption about 2g/kW.h can be reduced.Utilize in conjunction with fume afterheat, also can reduce unit mark coal consumption 1 ~ 2g/kW.h further.

Claims (8)

1. a CFBB deslagging bootstrap system, include boiler, boiler has deslagging end and smoke evacuation end, this smoke evacuation end connects smoke evacuation system, comprises the air preheater be connected with boiler, it is characterized in that in smoke evacuation system, also comprise slag cooler and steam air heater, the deslagging end of described boiler connects slag cooler, and described air preheater connects steam air heater, also comprises the heat medium water loop of being carried out exchange heat by slag cooler and steam air heater.
2. CFBB deslagging bootstrap system as claimed in claim 1, is characterized in that, described heat medium water loop arranges water pump, water supplement port and overflowing water port.
3. CFBB deslagging bootstrap system as claimed in claim 1, is characterized in that, described heat medium water loop connects water tank.
4. CFBB deslagging bootstrap system as claimed in claim 1, is characterized in that, described smoke evacuation system comprises the deduster, desulfuration absorbing tower and the chimney that are connected successively, and deduster connects described air preheater.
5. CFBB deslagging bootstrap system as claimed in claim 4, is characterized in that, also comprise flue gas-condensate water heat-exchange system, and this flue gas-condensate water heat-exchange system arranges at least 1 cigarette cooler, and it is located in described smoke evacuation system.
6. CFBB deslagging bootstrap system as claimed in claim 5, is characterized in that, comprise 1 cigarette cooler, before this cigarette cooler is placed in deduster, or before being placed in desulfuration absorbing tower.
7. CFBB deslagging bootstrap system as claimed in claim 5, is characterized in that, comprise 2 cigarette coolers, before it is located at deduster respectively and before desulfuration absorbing tower.
8. CFBB deslagging bootstrap system as claimed in claim 7, it is characterized in that, described 2 cigarette coolers form a condensate circuit jointly, or form respective condensate circuit respectively.
CN201520462922.4U 2015-07-01 2015-07-01 CFBB deslagging bootstrap system Active CN204717729U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106091072A (en) * 2016-06-27 2016-11-09 无锡锡能锅炉有限公司 A kind of gas fired-boiler heat reutilization system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106091072A (en) * 2016-06-27 2016-11-09 无锡锡能锅炉有限公司 A kind of gas fired-boiler heat reutilization system

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