CN102679318A - Full-load efficient reheating and boiler inlet air heating system - Google Patents
Full-load efficient reheating and boiler inlet air heating system Download PDFInfo
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- CN102679318A CN102679318A CN2011100667401A CN201110066740A CN102679318A CN 102679318 A CN102679318 A CN 102679318A CN 2011100667401 A CN2011100667401 A CN 2011100667401A CN 201110066740 A CN201110066740 A CN 201110066740A CN 102679318 A CN102679318 A CN 102679318A
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Abstract
The invention provides a full-load efficient reheating and boiler inlet air heating system which comprises a plurality of reheating system heating devices in serial connection, at least one high-load air source, at least one low-load air source and boiler hot air heaters, wherein each high-load air source is selectively communicated with one of the reheating system heating devices; each low-load air source is selectively communicated with one of the reheating system heating devices; the boiler hot air heaters are respectively arranged between each low-load air source and the reheating system heating device connected with the low-load air source or between each high-load air source and the reheating system heating device connected with the high-load air source; and the pressure of the low-load air sources is higher than the pressure of the high-load air sources. The full-load efficient reheating and boiler inlet air heating system can increase the efficiency of a generator set under a partial load and can improve a combustion condition of a boiler.
Description
Technical field
The present invention relates to technical field of power generation, relate in particular to a kind of efficient backheat of full load and boiler air intake heating system that is applicable to the power plant.
Background technology
In the power plant, heat regenerative system is a kind of system that utilizes Steam Heating condensate and feedwater.This system can all be recovered to the heat of steam in the working-medium water, to improve efficiency of thermal cycle.The firing equipment of heat regenerative system mainly comprises condensate heater, oxygen-eliminating device and feed-water heater.
The method that improves the thermodynamic efficiency in power plant has the boiler feed temperature of raising and improves boiler inlet temperature.Usually configuration heat regenerative system in power plant is come heated feed water with the multistage heat that draws gas of steam turbine through multistage firing equipment, with the heat recovery of steam in working-medium water, the raising feed temperature.Usually through air preheater flue-gas temperature is passed to air, improve the temperature of the wind that gets into boiler.At present, the efficient when the generating set full load is paid attention in the design of the system in power plant, however generating set all is under sub-load, to move usually, the efficient of generating set is lower than fully loaded efficient under sub-load.At present, the most of the time in nearly all power plant all is under sub-load, to move, and therefore improving the thermal efficiency of generating set under sub-load has very strong realistic meaning.
The improvement that the present invention carries out the system in existing power plant; Improve boiler feedwater and the boiler inlet temperature of generating set under sub-load simultaneously; Thereby can improve the efficient under the generating set sub-load, and not reduce the efficient of generating set under at full capacity.
On the other hand, boiler inlet temperature is high more, and the thermodynamic efficiency of generating set is high more, and present power plant technology is with flue gas heating boiler air intake.Receiving exhaust gas temperature can not low excessively restriction, and the raising of boiler inlet temperature also is restricted.The scheme close with the present invention has conventional backheat scheme, the efficient backheat scheme of full load, passes through the scheme of air preheater heating boiler air intake.
For example, in conventional backheat scheme as shown in Figure 1, come heated feed water through multistage heat regenerative system firing equipment, improve feed temperature with the multistage heat that draws gas of steam turbine.Feed temperature is directly proportional with the pressure that draws gas, and extraction pressure is high more, and feed temperature is high more.Heat regenerative system firing equipments at different levels and steam turbine be at different levels draw gas corresponding one by one.For the sliding pressure operation steam turbine, along with the decline of unit load, pressure of extracted steam from turbine descends, and the feed temperature of heat regenerative system also decreases.Therefore generating set thermal efficiency under sub-load will reduce.
In addition, in the efficient heat regenerative system of full load as shown in Figure 2, the different vapour source of firing equipment configuration multichannel pressure; When unit load is high, utilize the corresponding vapour of high load capacity source; When unit load is low, pressure is switched to the higher vapour source of pressure with normally drawing gas of step-down of load, make full use of heat regenerative system equipment; Thereby can improve the feedwater backheat temperature of heat regenerative system, thereby improve the efficiency of thermal cycle of unit at running on the lower load at partial load condition.Generally speaking, the generating set load is not less than 85% and can be described as the high load capacity operating mode at full capacity, is lower than 85% and can be described as sub-load or running on the lower load at full capacity.
In conventional power generation usage factory heat regenerative system shown in Figure 1, heat regenerative system firing equipment 101-103 at different levels and steam turbine be at different levels draw gas corresponding one by one.The effectiveness of regenerator of heat regenerative system is relevant with feed temperature, and feed temperature is directly proportional with the pressure that draws gas, and extraction pressure is high more, and feed temperature is high more.Receive condition restriction such as device structure, unit is in the peak load operating mode at present, and the feed temperature of unit generally all is starkly lower than best backheat temperature, and therrmodynamic system does not reach optimum efficiency.Under sub-load, pressure of extracted steam from turbine descends thereupon, and the feed temperature of heat regenerative system also decreases.Thereby reduced the whole efficiency of thermal cycle of unit.
According to the firing equipment 201-203 configuration multichannel pressure different vapour source 204-205 of the efficient heat regenerative system of full load shown in Figure 2 to heat regenerative system; When unit load is high, utilize the corresponding vapour of high load capacity source 204 (for example prior art normally draws gas); When unit load is low; Pressure is switched to the higher vapour source 205 of pressure with normally drawing gas of step-down of load; Make full use of heat regenerative system equipment, thereby can improve the feedwater backheat temperature of heat regenerative system, improved the efficient under the unit sub-load at running on the lower load.Therefore, the efficient heat regenerative system of full load has improved the integrated heat efficiency of unit than conventional heat regenerative system.
But; Also there is following deficiency in the simple efficient heat regenerative system of full load: (1) since in sub-load in the unit sliding pressure operation; Reduced extraction pressure, but extraction temperature does not descend or descends seldom, therefore the vapour source that switches to high pressure of drawing gas of heat regenerative system firing equipment possibly cause extraction temperature to improve under sub-load; Therefore the material rate that needs to improve firing equipment has increased the cost of firing equipment to satisfy the requirement that extraction temperature improves; Perhaps take measures to reduce the temperature (like spray desuperheating) of drawing gas, wasted the heat that draws gas; (2) owing to receive boiler structure and hydrodynamic condition restriction, the raising of feed temperature has a upper limit.Therefore when adopting the efficient heat regenerative system of full load to bring up to going up in limited time of boiler side requirement to feed temperature, the heat that draws gas can not further pass to feedwater, and this situation can appearance in the transformation of existing unit.
Summary of the invention
Above-mentioned deficiency to prior art; The present invention is intended to the heat regenerative system in existing power plant is improved; In the hope of improving the boiler feed temperature of generating set under sub-load, improve the efficient under the generating set sub-load, and do not reduce the efficient of generating set under at full capacity simultaneously.In addition, the present invention also expects to improve the boiler combustion operating mode.
Therefore, the present invention proposes efficient backheat of a kind of full load and boiler air intake heating system, comprising: a plurality of heat regenerative system firing equipments of series connection; At least one high load capacity vapour source, each high load capacity vapour source optionally is communicated with one of said a plurality of heat regenerative system firing equipments; At least one underload vapour source, each underload vapour source optionally is communicated with one of said a plurality of heat regenerative system firing equipments; The boiler storage heater; Be arranged at said each underload vapour source and with heat regenerative system firing equipment that this underload vapour source links to each other between or said each high load capacity vapour source and with heat regenerative system firing equipment that this high load capacity vapour source links to each other between; Wherein, the pressure in said underload vapour source is higher than the pressure in said high load capacity vapour source.
According to a preferred embodiment of the present invention, in efficient backheat of above-mentioned full load and boiler air intake heating system, said heat regenerative system firing equipment is condensate heater, oxygen-eliminating device or feed-water heater.
According to a preferred embodiment of the present invention, in efficient backheat of above-mentioned full load and boiler air intake heating system, under full load or high load capacity operating mode, said heat regenerative system firing equipment is switched to said high load capacity vapour source and is communicated with; And under running on the lower load, said heat regenerative system firing equipment is switched to said underload vapour source and is communicated with.
According to a preferred embodiment of the present invention; In efficient backheat of above-mentioned full load and boiler air intake heating system; Said boiler air intake firing equipment further comprises: storage heater, be connected in said each underload vapour source and with heat regenerative system firing equipment that this underload vapour source links to each other between or said each high load capacity vapour source and with heat regenerative system firing equipment that this high load capacity vapour source links to each other between; Air preheater connects a cold air duct in order to input secondary cold wind, connects flue gas input channel and flue gas output channel so that the inferior cold wind of importing from said cold air duct is once heated, and is connected to said storage heater via a secondary hot-air output channel.
According to a preferred embodiment of the present invention; In efficient backheat of above-mentioned full load and boiler air intake heating system; The hot blast that the warp of exporting from said air preheater once heats carries out post bake said storage heater, said hot blast through post bake outputs to boiler via the secondary hot-air output channel.。
According to a preferred embodiment of the present invention, in efficient backheat of above-mentioned full load and boiler air intake heating system, said firing equipment is single-row or biserial.
To sum up; Firing equipment the present invention has increased boiler air intake heating system on the basis of the efficient heat regenerative system of full load; The two is combined as a whole; Through the efficient heat regenerative system heated feed water of full load, another part is through boiler air intake heating system heating boiler air intake with the part in the energy that draws gas.
Earlier with the part heat air intake that draws gas, get back to heated feed water in the heat regenerative system through boiler air intake heating system then.Like this, the extraction temperature that gets into heat regenerative system reduces, and the heater of heat regenerative system need not adopt higher grade the material or the reduction extraction temperature of spraying water.And when receiving the boiler restriction can not be when all drawing gas the heat feedwater, the remaining heat that draws gas also capable of using have further improved the whole efficiency of generating set.
In addition, boiler air intake heating system of the present invention is arranged on air preheater outlet hot blast side, and with the hot secondary wind of the heating air preheater outlet of drawing gas, the temperature that therefore heats secondary wind can not receive the restriction of exhaust gas temperature and air preheater heat exchange capacity.
Should be appreciated that the above generality of the present invention is described and following detailed description all is exemplary and illustrative, and be intended to further explanation is provided for as claimed in claim the present invention.
Description of drawings
Comprise that accompanying drawing is for providing the present invention further to be understood, they are included and are constituted the application's a part, and accompanying drawing shows embodiments of the invention, and play the effect of explaining the principle of the invention with this specification.
In the accompanying drawing:
Heating steam and the heat regenerative system firing equipment that Fig. 1 shows prior art be heat regenerative system one to one.
Fig. 2 shows the efficient backheat of full load and the boiler air intake heating system in the multichannel vapour source of prior art.
Fig. 3 shows the schematic framework according to an efficient backheat of full load of the present invention and boiler air intake heating system.
Fig. 4 shows the structure of boiler air intake firing equipment according to a preferred embodiment of the present invention.
The specific embodiment
Now with embodiments of the present invention will be described by referring to the drawings in detail.
Fig. 3 shows the schematic framework of efficient backheat of full load according to the present invention and boiler air intake heating system.As shown in Figure 3, efficient backheat of full load of the present invention and boiler air intake heating system mainly comprise: a plurality of heat regenerative system firing equipment 301-303 of series connection, at least one high load capacity vapour source 304, at least one underload vapour source 305 and boiler storage heater 306.Particularly; In Fig. 3; Above-mentioned a plurality of heat regenerative system firing equipment is followed successively by condensate heater 301, oxygen-eliminating device 302 and feed-water heater 303, and correspondingly has three optional high load capacity vapour sources 304, three optional underloads 305 and the corresponding boiler storage heater 306 of three covers.Certainly, the present invention is not limited to this.According to different application conditions, can be equipped with multichannel vapour source to the firing equipment of one or more heat regenerative systems, and the quantity of firing equipment is also unrestricted.In addition, the firing equipment of heat regenerative system of the present invention can be conventional 3～9 grades, but this progression and unrestricted.In addition, firing equipment can also be single-row, also can be biserial, and columns is unrestricted too.
When operation; Along condensate and the feed piping heat regenerative system firing equipment of flowing through successively, i.e. condensate heater 301, oxygen-eliminating device 302, feed-water heater 303 are through the heating of steam from the working-medium water (like the upper right side among Fig. 3) of condenser; With the heat recovery of steam in water; Cause water temperature to raise step by step, get into boiler at last, satisfy the boiler feedwater requirement.
Firing equipment 301-303 to heat regenerative system; Except that full load or the corresponding vapour of high load capacity source (for example at different levels the drawing gas of steam turbine of corresponding configuration one by one of prior art)---the high load capacity vapour source 304; Also dispose the more vapour source of high pressure---underload vapour source 305, this underload vapour source 305 is used under the sub-load (underload) to provide to the firing equipment 301-303 of heat regenerative system or some or several firing equipments wherein and adds hot vapour source.
This underload vapour source 305 can be that upper level draws gas, and also can be the steam in other source.That is to say that each heater of efficient backheat of above-mentioned full load and boiler air intake heating system can come optionally to be communicated with high load capacity vapour source 304 or underload vapour source 305 according to the operating mode of reality.Particularly, under full load or high load capacity operating mode, heat regenerative system firing equipment 301-303 can be switched to high load capacity vapour source 304 and be communicated with, and under running on the lower load, heat regenerative system firing equipment 301-303 can be switched to underload vapour source 305 and be communicated with.As stated, the pressure in underload vapour source 305 is higher than the pressure in high load capacity vapour source 304.
In addition, can be that a plurality of firing equipments are selected different vapour sources also according to actual condition.For example; Because the final feed temperature of boiler inlet is determined by the extraction pressure of afterbody (leaving the nearest one-level of boiler on the flow process that promptly feeds water) heat regenerative system firing equipment usually, so the vapour source of afterbody heat regenerative system firing equipment may preferentially switch to the higher vapour source of pressure.
Importantly, in various embodiments of the present invention, with storage heater 306 be arranged at each underload vapour source 305 and with heat regenerative system firing equipment that this underload vapour source 305 links to each other between.In addition, though not shown among Fig. 3, the present invention also can be in a similar fashion with boiler storage heater 306 be arranged at each high load capacity vapour source 304 and with heat regenerative system firing equipment that this high load capacity vapour source 304 links to each other between.Like what illustrate in greater detail among Fig. 4, above-mentioned boiler air intake firing equipment is made up of following assembly at least: storage heater 401 and air preheater 402.Wherein, air preheater 402 is the abbreviations to boiler air preheater, and it heats secondary wind through boiler smoke.The storage heater 401 general hot secondary wind that air preheater 402 is exported of drawing gas of steam turbine that adopt heat.
Wherein, this storage heater 401 be connected in above-mentioned each underload vapour source and with heat regenerative system firing equipment that this underload vapour source links to each other between or above-mentioned each high load capacity vapour source and with heat regenerative system firing equipment that this high load capacity vapour source links to each other between; And air preheater 402 connects a cold air duct 403 in order to input cold wind, also connects flue gas input channel 404 and flue gas output channel 405 so that the cold wind from cold air duct 403 inputs is once heated.In addition, this air preheater 402 is connected to storage heater 401 via a secondary hot-air output channel 406 in addition.
When operation, the hot blast that the warp of exporting from air preheater 402 once heats carries out post bake storage heater 401, and this hot blast through post bake then outputs to boiler (not shown) via secondary hot-air output channel 407.
It should be noted that in the embodiment shown in fig. 4 storage heater 401 is connected to underload vapour source.But in the present invention, this storage heater 401 also can connect high load capacity vapour source.In addition, the other end of this storage heater 401 is also connected to the firing equipment (the firing equipment 301-303 among Fig. 3) of above-mentioned heat regenerative system.These more heat through the hot blast of 401 pairs of air preheaters of storage heater, 402 outlets earlier in the vapour source of high pressure, and the firing equipment through heat regenerative system heats feedwater or condensate then.Under the unit sub-load, see that from vapour source and course journey the firing equipment of storage heater and heat regenerative system is connected.
Be appreciated that the present invention mainly is based on the backheat principle and the Principles of Boiler of thermodynamic cycle.In steam turbine power generation factory, dispose heat regenerative system usually, come heat-setting water and feedwater with the multistage heat that draws gas of steam turbine through multistage firing equipment, to improve thermodynamic system efficiency.It is high more to improve boiler inlet temperature, can improve the thermodynamic efficiency of generating set.Firing equipment
In the existing configuration, it is normally corresponding one by one that firing equipments at different levels and steam turbine at different levels draw gas.The effectiveness of regenerator of heat regenerative system is relevant with best backheat feed temperature, and feed temperature is directly proportional with the pressure that draws gas, and extraction pressure is high more, and feed temperature is high more.In addition, receive condition restriction such as device structure, unit is in the peak load operating mode at present, and the feed temperature of unit generally all is starkly lower than best backheat temperature.In addition, receive the restriction of exhaust gas temperature, the raising of boiler inlet temperature also is restricted.
Generating set sliding pressure operation under sub-load, extraction pressure reduce, but extraction temperature does not descend or descends seldom, and this just is that efficient backheat of full load and boiler air intake heating system improve generatine set heat efficiency and created condition under sub-load.
Efficient backheat of full load and boiler air intake heating system are to the different vapour source of firing equipment configuration multichannel pressure of heat regenerative system; When unit load is high, utilize the corresponding vapour source (for example prior art normally draws gas) of high load capacity; When unit load is low; Pressure is switched to the higher vapour source of pressure with normally drawing gas of step-down of load, improve the feedwater backheat temperature of heat regenerative system, improved the efficient under the unit sub-load at running on the lower load.Meanwhile, under sub-load, the hot blast temperature that gets into boiler furnace at first through the hot secondary wind of storage heater heating air preheater outlet, has been improved in the vapour source of switching, has also improved the efficient under the unit sub-load.
Storage heater is arranged on the upper reaches of the firing equipment of heat regenerative system, can reduce the inlet steam temperature of heat regenerative system firing equipment, has avoided changing the material of heat regenerative system firing equipment, has reduced equipment cost.
Those skilled in the art can be obvious, can carry out various modifications and modification and without departing from the spirit and scope of the present invention to above-mentioned exemplary embodiment of the present invention.Therefore, be intended to that the present invention is covered and drop in appended claims and the come scope thereof to modification of the present invention and modification.
Claims (6)
1. efficient backheat of full load and boiler air intake heating system comprise:
A plurality of heat regenerative system firing equipments of series connection;
At least one high load capacity vapour source, each high load capacity vapour source optionally is communicated with one of said a plurality of heat regenerative system firing equipments;
At least one underload vapour source, each underload vapour source optionally is communicated with one of said a plurality of heat regenerative system firing equipments;
The boiler storage heater, be arranged at said each underload vapour source and with heat regenerative system firing equipment that this underload vapour source links to each other between or said each high load capacity vapour source and with heat regenerative system firing equipment that this high load capacity vapour source links to each other between,
Wherein, the pressure in said underload vapour source is higher than the pressure in said high load capacity vapour source.
2. efficient backheat of full load as claimed in claim 1 and boiler air intake heating system is characterized in that said heat regenerative system firing equipment is condensate heater, oxygen-eliminating device or feed-water heater, and boiler air intake firing equipment is air preheater or storage heater.
3. efficient backheat of full load as claimed in claim 1 and boiler air intake heating system is characterized in that,
Under full load or high load capacity operating mode, said heat regenerative system firing equipment is switched to said high load capacity vapour source and is communicated with; And
Under running on the lower load, said heat regenerative system firing equipment is switched to said underload vapour source and is communicated with.
4. efficient backheat of full load as claimed in claim 1 and boiler air intake heating system is characterized in that, said boiler air intake firing equipment further comprises:
Storage heater, be connected in said each underload vapour source and with heat regenerative system firing equipment that this underload vapour source links to each other between or said each high load capacity vapour source and with heat regenerative system firing equipment that this high load capacity vapour source links to each other between;
Air preheater; Connect a cold air duct in order to input secondary cold wind; Connect flue gas input channel and flue gas output channel so that the secondary cold wind of importing from said cold air duct is once heated, and be connected to said storage heater via a secondary hot-air output channel.
5. efficient backheat of full load as claimed in claim 4 and boiler air intake heating system; It is characterized in that; The hot blast that the warp of exporting from said air preheater once heats carries out post bake said storage heater, said hot blast through post bake outputs to boiler via the secondary hot-air output channel.
6. efficient backheat of full load as claimed in claim 1 and boiler air intake heating system is characterized in that said firing equipment is single-row or biserial.
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| CN2011100667401A CN102679318A (en) | 2011-03-18 | 2011-03-18 | Full-load efficient reheating and boiler inlet air heating system |
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| CN2011100667401A CN102679318A (en) | 2011-03-18 | 2011-03-18 | Full-load efficient reheating and boiler inlet air heating system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107388229A (en) * | 2017-08-31 | 2017-11-24 | 冯煜珵 | A kind of adjustable joint backheating system |
| CN114215618A (en) * | 2021-12-23 | 2022-03-22 | 国能龙源蓝天节能技术有限公司 | Reheating thermal section steam recycling system, steam supply system and steam supply method thereof |
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| CN114215618A (en) * | 2021-12-23 | 2022-03-22 | 国能龙源蓝天节能技术有限公司 | Reheating thermal section steam recycling system, steam supply system and steam supply method thereof |
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Application publication date: 20120919 |