CN105737129B - The synthesis afterheat utilizing system of First air warm depth optimization - Google Patents
The synthesis afterheat utilizing system of First air warm depth optimization Download PDFInfo
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- CN105737129B CN105737129B CN201610228659.1A CN201610228659A CN105737129B CN 105737129 B CN105737129 B CN 105737129B CN 201610228659 A CN201610228659 A CN 201610228659A CN 105737129 B CN105737129 B CN 105737129B
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- air preheater
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
- F22B31/08—Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
-
- 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
Abstract
The invention discloses a kind of synthesis afterheat utilizing systems for the First air warm depth optimization for belonging to power station field of energy-saving technology, the system preheats primary and secondary air using preposition air preheater, the Secondary Air preheater of flue collector further heats Secondary Air using two points of storehouse rotary regenerative air preheaters, and First air is progressively heated to coal pulverizer inlet required temperature by preposition air preheater, level-one steam First air preheater and second steam First air preheater successively；Feed-water heater and condensation water heater arranged in series in bypass flue, heating feedwater and condensation water.The system individually preheats primary and secondary air, using low-temperature flue gas and extracted steam from turbine progressive solution First air, avoids what cold and hot First air blending was broughtLoss, while high-grade flue gas heat is displaced, heating feedwater and condensation water, Secondary Air utilize preposition air preheater and two points of storehouse air preheater progressive solutions, fully realize the depth energy saving consumption reduction of Thermal generation unit, remarkable in economical benefits.
Description
Technical field
The invention belongs to power station energy-saving field, the synthesis waste heat profit of more particularly to a kind of First air warm depth optimization
Use system.
Background technology
Energy-saving and emission-reduction have become China and have solved energy crisis and the grand strategy of problem of environmental pollution, huge to alleviate China
Energy consumption and environmental pressure, Large-sized Coal-fired Power group progressively carried out the research and application of UTILIZATION OF VESIDUAL HEAT IN, improved coal-fired
The efficiency of energy utilization of power station unit, to set heat exchange Optimum Design, deeply excavate coal fired power plant unit energy-saving potential
The problem of each coal fired power plant pay attention to day by day is become.
Conventional coal fired power plant is generally using trisector air heater, and primary and secondary air is all in swinging air
Heating in preheater, air mass flow is big, and inleakage is big, can not realize that an air temperature is adjusted, it is necessary to using temperature adjustment First air with
It can be only achieved the requirement of coal pulverizer inlet after heat primary air blending, but there are larger during cold and hot First air blendsLoss, therefore there are larger energy-saving potentials in the pre- thermal flow process of First air.
The residual-heat utilization technology of comparative maturity is the back-end ductwork Installing Low Pressure Economizer after air preheater at present,
Using the waste-heat condensation water of smoke evacuation, squeeze the extracted steam from turbine of low pressure, increase unit and go out work(, but it is only capable of using low-grade
Fume afterheat, energy-saving effect is very limited, and exists simultaneously low-temperature corrosion, limitation is larger.Current relatively advanced bypass
Flue system, into the air of air preheater, is displaced high-grade using the low-grade flue gas preheating of air preheater outlet
Flue gas condensation water and feedwater, exclusion extracted steam from turbine return to steam turbine acting, increase unit and go out work(, improve efficiency.But its
Do not change preheating of air flow, however it remains First air blending is broughtLoss.
Existing heat primary air heater and its system, which use to export in air preheater, sets First air to be changed with condensation water
Hot device, which reduces a wind-warm syndrome, can not realize good energy-saving effect, because total First air caloric receptivity and coal pulverizer inlet are once
Wind-warm syndrome is certain, which can only play the purpose for adjusting coal pulverizer inlet wind-warm syndrome, compared to flue gas direct heat transfer to solidifying
It bears water, the system increases heat transfer process, cause the irreversible loss increase of heat exchange, and energy-saving effect is unsatisfactory.It is and conventional
Coal fired power plant is limited, wind-warm syndrome of import is higher since the raw coal moisture into pulverized coal preparation system is higher by pulverized coal preparation system drying.Cause
This, is limited by factors, and there are larger energy dissipation, existing technologies to reach for existing air preheating system
To good energy saving purpose.
The present invention proposes a kind of synthesis afterheat utilizing system of First air warm depth optimization, solves above-mentioned ask
Topic, core design thought are：The primary and secondary air of the synthesis afterheat utilizing system of First air warm depth optimization is passing through
Cross after the preheating of preposition air preheater and separate, Secondary Air enter two points of storehouse swinging Secondary Air preheaters positioned at flue collector into
One step preheats, and First air by level-one steam First air preheater and second steam First air preheater, is heated to coal-grinding successively
Machine entrance required temperature.A large amount of high-grade fume afterheat heating feedwater and condensation water, row are displaced using bled steam preheating First air
High-grade extracted steam from turbine is squeezed, reduces air-heater leakage.Temperature adjustment wind of the different bleed off passages as adjusting First air is set,
First air is adjusted using temperature adjustment wind if necessary and meet coal pulverizer needs, make system safer reliable.First air warm is deep
The synthesis afterheat utilizing system of degree optimization adequately achieves energy counterpart, cascade utilization, significantly reduces systemDamage improves
The utilization ratio of energy, is an energy-saving and emission-reduction new technology for being widely used in coal fired power plant.
The content of the invention
The purpose of the present invention is to propose to a kind of synthesis afterheat utilizing systems of First air warm depth optimization, this is
System mainly includes preposition air preheater, Secondary Air preheater, level-one steam First air preheater, the preheating of second steam First air
Device, flue collector, bypass flue, feed-water heater, condensation water heater, feeder and coal pulverizer；It is characterized in that：Boiler tail
Portion's flue is separated into flue collector 1 in parallel and bypass flue 2, and two points of storehouse swinging Secondary Air preheaters are arranged in flue collector 1
3, feed-water heater 4 and condensation water heater 5 are sequentially arranged in bypass flue 2, after two points of storehouse swinging Secondary Air preheaters 3
The flue that converges preposition air preheater 6 is set；Primary air piping road after preposition air preheater 6 sets gradually level-one steaming
Vapour First air preheater 7 and second steam First air preheater 8；The entrance of feed-water heater 4 passes through the second valve 14 and high pressure
The entrance of heater 11 is connected, and the outlet and economizer of the outlet of feed-water heater 4 with high-pressure heater 11 are connected；Condensation water adds
The water inlet of hot device 5 is connected by the first valve 13 with the inlet of low-pressure heater 12, the water outlet of condensation water heater 5 with
The exit of low-pressure heater 12 is connected, the Secondary Air outlet of preposition air preheater 6 and two points of storehouse swingings two of flue collector 1
Secondary wind preheater 3 is connected, and First air outlet is connected with level-one steam First air preheater 7, level-one steam First air preheater 7
Outlet is connected with the entrance of second steam First air preheater 8, the First air bypass air passage of level-one steam First air preheater 7
Outlet is connected by the 3rd valve 15 with the outlet of second steam First air preheater 8, in two points of storehouse swinging Secondary Air preheatings
Boiler back end ductwork before device 3 sets flue gas bleed off passage 17, and outlet is preheated by the 4th valve 16 with second steam First air
The outlet conduit of device 8 is connected, and the First air bypass duct that preposition air preheater 6 exports passes through the 5th valve 18 and second steam
The outlet of First air preheater 8 is connected, and the First air bypass air passage of preposition 6 entrance of air preheater passes through the 6th valve 19 and two
The outlet of grade steam First air preheater 8 is connected；No. 6 steam extractions of the air intake C and steam turbine of level-one steam First air preheater 7
The connected extraction opening of mouth is connected, and venthole D is connected with the drain water piping D of low-pressure heater 12, second steam First air preheater 8
First air outlet be connected with the First air entrance of coal pulverizer 10, while the air intake A and vapour of second steam First air preheater 8
No. 3 extraction openings of turbine are connected, and venthole B is connected with 11 drain water piping B of high-pressure heater.
The First air entrance is connected by the 6th valve 19 with the 5th valve 18, the 3rd valve 15；4th valve, 16 He
The First air outlet of second steam First air preheater 8 is connected.
The First air that the preposition air preheater 6 exports goes out without two points of storehouse swinging Secondary Air preheaters 3
Mouth is connected with the entrance of level-one steam First air preheater 7, the outlet connection second steam one of level-one steam First air preheater 7
The entrance of secondary wind preheater 8 realizes First air progressive solution.
8 entrance of second steam First air preheater passes through the 3rd valve 15 and second steam First air preheater 8
Outlet is connected, and the First air bypass air passage that preposition air preheater 6 exports is pre- by the 5th valve 18 and second steam First air
The outlet of hot device 8 is connected, and the First air bypass air passage of preposition 6 entrance of air preheater passes through the 6th valve 19 and second steam one
The outlet of secondary wind preheater 8 is connected, and the flue collector before two points of storehouse swinging Secondary Air preheaters 3 sets flue gas bleed off passage 17,
Its outlet is connected by the 4th valve 16 with the outlet conduit of second steam First air preheater 8, for adjusting an air temperature.
First air or the flue gas of appropriate location may be selected if necessary for adjusting an air temperature.
The Secondary Air entrance of two points of storehouse swinging Secondary Air preheaters 3 of the flue collector 1 and preposition air preheater 6
Secondary Air outlet be connected, two points of storehouse swinging Secondary Air preheaters 3 of flue collector 1 are served only for heating Secondary Air.
It is individually heated the beneficial effects of the invention are as follows primary and secondary air, reduces the air mass flow of Secondary Air preheater, reduced
Leaking out for air preheater sets two-stage steam First air preheater heating First air, eliminates cold and hot First air and blended
Journey can be reduced effectivelyLoss；It may be selected to utilize the outlet of level-one steam First air preheater, preposition air in special circumstances
The flue gas of preheater outlet, the First air of preposition air preheater entrance and flue collector bleeding point is adjusted and entered as temperature adjustment wind
Air temperature of coal pulverizer, makes system more flexible and efficient and reliable；Feed-water heater and condensation water heater can utilize side
The heat exclusion steam turbine regenerative steam of road flue gas；The preferred arrangement of each heat transmission equipment of system can realize the abundant of energy
Counterpart, cascade utilization can greatly improve the comprehensive utilization ratio of coal fired power plant.
Description of the drawings
Fig. 1 is the synthesis afterheat utilizing system of First air warm depth optimization
Embodiment
The present invention proposes a kind of synthesis afterheat utilizing system of First air warm depth optimization.Below in conjunction with the accompanying drawings and
Example is explained.
The synthesis afterheat utilizing system of First air warm depth optimization as shown in Figure 1, the main one kind one of the system
The synthesis afterheat utilizing system of secondary wind warm depth optimization, it is pre- which mainly includes preposition air preheater, Secondary Air
It is hot device, level-one steam First air preheater, second steam First air preheater, flue collector, bypass flue, feed-water heater, solidifying
Bear water heater, feeder and coal pulverizer；It is characterized in that：Boiler back end ductwork is separated into flue collector 1 in parallel and side
Road flue 2 arranges two points of storehouse swinging Secondary Air preheaters 3 in flue collector 1, feed-water heater 4 is sequentially arranged in bypass flue 2
With condensation water heater 5, the flue that converges after two points of storehouse swinging Secondary Air preheaters 3 sets preposition air preheater 6；Before
It empties the road of the primary air piping after air preheater 6 and sets gradually level-one steam First air preheater 7 and second steam First air
Preheater 8；The entrance of feed-water heater 4 is connected by the second valve 14 with the entrance of high-pressure heater 11, feed-water heater 4
It exports the outlet with high-pressure heater 11 and economizer is connected；The water inlet of condensation water heater 5 by the first valve 13 with it is low
The inlet of pressure heater 12 is connected, and the water outlet of condensation water heater 5 is connected with the exit of low-pressure heater 12, preceding to empty
The Secondary Air outlet of air preheater 6 is connected with two points of storehouse swinging Secondary Air preheaters 3 of flue collector 1, First air outlet and one
Grade steam First air preheater 7 is connected, outlet and the second steam First air preheater 8 of level-one steam First air preheater 7
Entrance is connected, and the outlet in the First air bypass air passage of level-one steam First air preheater 7 passes through the 3rd valve 15 and second steam
The outlet of First air preheater 8 is connected, and the boiler back end ductwork before two points of storehouse swinging Secondary Air preheaters 3 sets flue gas to take out
Gas point 17, outlet are connected by the 4th valve 16 with the outlet conduit of second steam First air preheater 8, preposition air preheat
The First air bypass air passage that device 6 exports is connected by the 5th valve 18 with the outlet of second steam First air preheater 8, preceding to empty
The First air bypass air passage of 6 entrance of air preheater is connected by the 6th valve 19 with the outlet of second steam First air preheater 8；
The air intake C of level-one steam First air preheater 7 is connected with No. 6 extraction openings of steam turbine, venthole D and low-pressure heater 12
Drain water piping D be connected, the outlet of the First air of second steam First air preheater 8 is connected with the First air entrance of coal pulverizer 10,
The air intake A of second steam First air preheater 8 is connected with No. 3 extraction openings of steam turbine simultaneously, venthole B and hyperbaric heating
11 drain water piping B of device is connected.First air entrance is connected by the 6th valve 19 with the 5th valve 18, the 3rd valve 15；4th valve
Door 16 is connected with the First air outlet of second steam First air preheater 8.
As shown in Figure 1, in the synthesis afterheat utilizing system of First air warm depth optimization, by preposition air preheat
The First air of device outlet introduces steam First air preheater and further preheats, and 60 DEG C or so exported by preposition air preheater add
Heat is to 110 DEG C or so, and subsequently into second steam First air preheater, First air is heated to coal pulverizer inlet by 110 DEG C or so
Required temperature.
Between level-one steam First air preheater 7 and second steam First air preheater 8, preposition air preheater 6 with
The primary air piping road of 6 entrance of primary air duct and preposition air preheater between level-one steam First air preheater 7 is respectively
First air is set to bypass air passage, when an air temperature cannot meet 10 inlet temperature requirements of coal pulverizer, different temperatures may be selected
Low-temperature primary wind mixed by the valve First air higher with second steam First air 8 outlet temperatures of preheater, pass through control
Valve opening adjusts a wind flow in bypass flue, meets the requirements an air temperature into coal pulverizer, so increases
The flexibility of system.
When an air temperature cannot meet 10 inlet temperature requirements of coal pulverizer, the Secondary Air preheater in flue collector is utilized
Preceding setting bleeding point 17 draws part of smoke from flue collector bleeding point 17 and is used for heating First air, ensures that First air reaches coal-grinding
10 inlet temperature requirements of machine, make system more safe and reliable.
The present invention utilizes the steam extraction point of steam turbine difference extraction opening using the Secondary Air preheater heating Secondary Air of flue collector
Grade heating First air.The link of cold and hot First air blending has been fully phased out, has thoroughly avoided what cold and hot First air blending was brought
Loss.Meanwhile the present invention preheats preposition air preheater, two points of storehouse swinging Secondary Air preheaters, two-stage steam First air
Device, feed-water heater and condensation water heater carry out complex optimum arrangement, realize fully counterpart, the cascade utilization of energy,
So that the utilization rate of waste heat of coal unit significantly improves, remarkable in economical benefits.
Claims (5)
1. a kind of synthesis afterheat utilizing system of First air warm depth optimization, which mainly includes preposition air preheat
Device, Secondary Air preheater, second steam First air preheater, flue collector, bypass flue, are given level-one steam First air preheater
Water heater, condensation water heater, feeder and coal pulverizer；It is characterized in that：Boiler back end ductwork is separated into parallel
Flue collector (1) and bypass flue (2), flue collector (1) two points of storehouse swinging Secondary Air preheaters (3) of middle arrangement, bypass flue (2)
In be sequentially arranged feed-water heater (4) and condensation water heater (5), the remittance after two points of storehouse swinging Secondary Air preheaters (3)
It closes flue and preposition air preheater (6) is set；Primary air piping road after preposition air preheater (6) sets gradually level-one steaming
Vapour First air preheater (7) and second steam First air preheater (8)；The entrance of feed-water heater (4) passes through the second valve
(14) entrance with high-pressure heater (11) is connected, the outlet of feed-water heater (4) and the outlet of high-pressure heater (11) and province
Coal device is connected；The water inlet of condensation water heater (5) is connected by the first valve (13) with the inlet of low-pressure heater (12),
The water outlet of condensation water heater (5) is connected with the exit of low-pressure heater (12), the Secondary Air of preposition air preheater (6)
Outlet is connected with two points of storehouse swinging Secondary Air preheaters (3) of flue collector (1), and First air outlet is pre- with level-one steam First air
Hot device (7) is connected, and the outlet of level-one steam First air preheater (7) is connected with the entrance of second steam First air preheater (8),
The outlet in the First air bypass air passage of level-one steam First air preheater (7) passes through the 3rd valve (15) and second steam First air
The outlet of preheater (8) is connected, and the boiler back end ductwork before two points of storehouse swinging Secondary Air preheaters (3) sets flue gas to be evacuated
Point (17), outlet are connected by the 4th valve (16) with the outlet conduit of second steam First air preheater (8), preposition air
The outlet that the First air bypass air passage of preheater (6) outlet passes through the 5th valve (18) and second steam First air preheater (8)
It is connected, the First air bypass air passage of preposition air preheater (6) entrance is pre- by the 6th valve (19) and second steam First air
The outlet of hot device (8) is connected；The air intake C of level-one steam First air preheater (7) is connected with No. 6 extraction openings of steam turbine,
Venthole D is connected with the drain water piping D of low-pressure heater (12), the outlet of the First air of second steam First air preheater (8) with
The First air entrance of coal pulverizer (10) is connected, while No. 3 of the air intake A of second steam First air preheater (8) and steam turbine
Extraction opening is connected, and venthole B is connected with high-pressure heater (11) drain water piping B.
2. a kind of synthesis afterheat utilizing system of First air warm depth optimization according to claim 1, feature
It is, the First air entrance is connected by the 6th valve (19) with the 5th valve (18), the 3rd valve (15), the 4th valve
(16) it is connected with the outlet of the First air of second steam First air preheater (8).
3. a kind of synthesis afterheat utilizing system of First air warm depth optimization according to claim 1, feature
Be, the First air of the preposition air preheater (6) outlet without two points of storehouse swinging Secondary Air preheaters (3),
Outlet is connected with the entrance of level-one steam First air preheater (7), the outlet connection two level of level-one steam First air preheater (7)
The entrance of steam First air preheater (8) realizes First air progressive solution.
4. a kind of synthesis afterheat utilizing system of First air warm depth optimization according to claim 1, feature
It is, second steam First air preheater (8) entrance passes through the 3rd valve (15) and second steam First air preheater
(8) outlet is connected, and the First air bypass air passage of preposition air preheater (6) outlet passes through the 5th valve (18) and second steam one
The outlet of secondary wind preheater (8) is connected, and the First air bypass duct of preposition air preheater (6) entrance passes through the 6th valve (19)
Outlet with second steam First air preheater (8) is connected, and the flue collector before two points of storehouse swinging Secondary Air preheaters (3) is set
Put flue gas bleed off passage (17), the outlet conduit phase that outlet passes through the 4th valve (16) and second steam First air preheater (8)
Even, for air temperature of adjusting；First air or the flue gas of appropriate location may be selected if necessary for adjusting an air temperature.
5. a kind of synthesis afterheat utilizing system of First air warm depth optimization according to claim 1, feature
It is, Secondary Air entrance and the preposition air preheater of two points of storehouse swinging Secondary Air preheaters (3) of the flue collector (1)
(6) Secondary Air outlet is connected, and two points of storehouse swinging Secondary Air preheaters (3) of flue collector (1) are served only for heating Secondary Air.
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| CN106402915A (en) * | 2016-11-22 | 2017-02-15 | 上海交通大学 | Method and mechanism for increasing temperature of primary air of boiler pulverizing system |
| CN107202318A (en) * | 2017-05-22 | 2017-09-26 | 大唐(北京)能源管理有限公司 | A kind of heat of smoke discharged from boiler of power station deep exploitation and water reclamation system |
| CN107504512A (en) * | 2017-08-04 | 2017-12-22 | 上海发电设备成套设计研究院有限责任公司 | A kind of hot primary wind heating system for being used to dry pulverized coal preparation system |
| CN108224461A (en) * | 2018-01-29 | 2018-06-29 | 东方电气集团东方锅炉股份有限公司 | Flue-gas temperature step partition type air preheater system |
| CN109681898B (en) * | 2019-01-22 | 2024-03-22 | 上海电力学院 | Primary air heating temperature-regulating system of phase-change heat pipe type power plant |
| CN110107912A (en) * | 2019-04-30 | 2019-08-09 | 华电电力科学研究院有限公司 | A kind of coal-burning power plant's novel air preheater system and its working method |
| CN110805481A (en) * | 2019-10-10 | 2020-02-18 | 东方电气集团东方汽轮机有限公司 | Steam power cycle system based on energy cascade utilization |
| CN111120985A (en) * | 2019-12-10 | 2020-05-08 | 华电电力科学研究院有限公司 | System and method for improving coal type adaptability of boiler coal pulverizing system |
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