CN204756887U - High -efficient hot media water system of circulating fluidized bed boiler - Google Patents
High -efficient hot media water system of circulating fluidized bed boiler Download PDFInfo
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- CN204756887U CN204756887U CN201520462923.9U CN201520462923U CN204756887U CN 204756887 U CN204756887 U CN 204756887U CN 201520462923 U CN201520462923 U CN 201520462923U CN 204756887 U CN204756887 U CN 204756887U
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Abstract
The utility model discloses a high -efficient hot media water system of circulating fluidized bed boiler, contain the boiler, still contain the hot media water system, it mainly comprises cold sediment ware and fan heater, this cold sediment ware is connected with row's cinder notch of boiler, the air intake connection of fan heater and boiler, still contain the hot media water return circuit of carrying out heat exchange through cold sediment ware and electric fan heater in this hot media water system, the moisturizing mouth and the overflow mouth of a river are established to this hot media water return circuit, through cold sediment ware, cyclic utilization is carried out to row's sediment waste heat of boiler in fan heater and hot media water return circuit, thereby improve the thermal efficiency of boiler, reduce the unit coal consumption.
Description
Technical field
The invention belongs to energy-saving and emission-reduction field, relate to a kind of CFBB power station and effectively improve boiler efficiency, reduce 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 of the present invention solved technical problem is providing one more effectively to utilize deslagging waste heat, the efficient heating agent water system of the CFBB of raising 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 efficient heating agent water system of CFBB, comprise boiler, also comprise heat medium water system, it is primarily of slag cooler and steam air heater composition, this slag cooler is connected with the slag-drip opening of boiler, steam air heater is connected with the air inlet of boiler, also comprises the heat medium water loop of being carried out exchange heat by slag cooler and warm-air drier in this heat medium water system, and water supplement port and overflowing water port are established in this heat medium water loop.
Described heat medium water loop arranges water pump.
Described heat medium water loop water supplement port is all connected water tank with overflowing water port.
2 or multiple heat-exchange device is established, the in parallel or series connection of these 2 or multiple heat-exchange device in described warm-air drier.
Air preheater is established between described boiler and steam air heater.
The beneficial effect that the utility model produces is as follows.
1, the present invention 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 heat medium water loop of the present invention, 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.
3, the steam air heater in the present invention 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 present invention 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
Fig. 1 is the structural representation of the efficient heating agent water system of CFBB of the present invention.
Fig. 2 is another structural representation of the efficient heating agent water system of CFBB of the present invention.
Detailed description of the invention
The utility model protects a kind of efficient heating agent water system of CFBB, and annexation as shown in Figure 1, comprises boiler 1.It focuses on comprising heat medium water system, it forms primarily of slag cooler 2 and steam air heater 4, this slag cooler 2 is connected with the slag-drip opening of boiler 1, steam air heater 4 is connected with the air inlet of boiler 1, also comprise the heat medium water loop 3 of being carried out exchange heat successively by slag cooler 3 and warm-air drier 4 in this heat medium water system, water supplement port 35 and overflowing water port 36 are established in this heat medium water loop 3.
Heat medium water loop 3 can arrange water pump 30, for heat medium water flowing provides power.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, by subsidiary water tank for heat medium water loop provides moisturizing or overflow volume.
As shown in Figure 2, the water supplement port 35 in described heat medium water loop 3, overflowing water port 36 establish valve 33,32 respectively, control the flow of heat medium water turnover.Heat medium water flow hour opens valve 33, is supplemented in water loop by water supplement port by heat medium water, opens valve 32 when heat medium water flow is large, is discharged by unnecessary heat medium water by overflowing water port, with the result of use making heat medium water loop reach best.Water supplement port 35 and overflowing water port 36 also can be connected with water tank 10, and ensure the supply of heat medium water, the setting of water tank 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.For the ease of regulating the flow of heat medium water, valve 31,34 can be established on heat medium water loop simultaneously.
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 present invention 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.
During use, boiler slag is by slag cooler 2, and the exchange heat of waste residue is to heat medium water, and heat the cold wind entering it through warm-air drier 4 after heat medium water circulation, the hot blast absorbed after heat enters boiler, and then completes recycling of heat in waste residue.
In actual use; the discharge flue of boiler usually can through air preheater 5; this air preheater 5 can carry out the heat exchange of hot blast and boiler exhaust gas system, and a part of heat of being discharged by boiler in flue gas is taken back boiler furnace by hot blast and carried out cycling and reutilization, improves the utilization rate of heat.Due to present to the requirement of environmental protection, boiler all can adopt the measure of environmental protection, such as shown in Fig. 2, SCR denitration reactor 6 can be established between air preheater 5 and boiler 1, or in follow-up smoke discharging pipe, install other environmental protection equipment additional, carry out selection according to the service condition of reality to arrange, no longer specifically describe at this.
Claims (5)
1. the efficient heating agent water system of a CFBB, comprise boiler, it is characterized in that, also comprise heat medium water system, it is primarily of slag cooler and steam air heater composition, and this slag cooler is connected with the slag-drip opening of boiler, and steam air heater is connected with the air inlet of boiler, also comprise the heat medium water loop of being carried out exchange heat by slag cooler and warm-air drier in this heat medium water system, water supplement port and overflowing water port are established in this heat medium water loop.
2. the efficient heating agent water system of CFBB as claimed in claim 1, is characterized in that, described heat medium water loop arranges water pump.
3. the efficient heating agent water system of CFBB as claimed in claim 1, it is characterized in that, described heat medium water loop water supplement port is all connected water tank with overflowing water port.
4. the efficient heating agent water system of CFBB as claimed in claim 1, is characterized in that, establish 2 or multiple heat-exchange device in described warm-air drier, these 2 or multiple heat-exchange device is in parallel or series connection.
5. the efficient heating agent water system of CFBB as claimed in claim 1, is characterized in that, establish air preheater between described boiler and steam air heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520462923.9U CN204756887U (en) | 2015-07-01 | 2015-07-01 | High -efficient hot media water system of circulating fluidized bed boiler |
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| CN201520462923.9U CN204756887U (en) | 2015-07-01 | 2015-07-01 | High -efficient hot media water system of circulating fluidized bed boiler |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108775593A (en) * | 2018-04-09 | 2018-11-09 | 华中科技大学 | A kind of dried slag removing waste heat recovery device |
| CN109282280A (en) * | 2018-09-29 | 2019-01-29 | 中国能源建设集团广东省电力设计研究院有限公司 | CFB Boiler water combined recovery heat of slags system and its control method |
| CN110296385A (en) * | 2019-07-23 | 2019-10-01 | 江西振态科技协同创新有限公司 | The boiler heat-energy recycling system and method for ecological sheet material processing |
-
2015
- 2015-07-01 CN CN201520462923.9U patent/CN204756887U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108775593A (en) * | 2018-04-09 | 2018-11-09 | 华中科技大学 | A kind of dried slag removing waste heat recovery device |
| CN109282280A (en) * | 2018-09-29 | 2019-01-29 | 中国能源建设集团广东省电力设计研究院有限公司 | CFB Boiler water combined recovery heat of slags system and its control method |
| CN110296385A (en) * | 2019-07-23 | 2019-10-01 | 江西振态科技协同创新有限公司 | The boiler heat-energy recycling system and method for ecological sheet material processing |
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