CN106500127A - A kind of bypass air preheater heat recovery system and method - Google Patents
A kind of bypass air preheater heat recovery system and method Download PDFInfo
- Publication number
- CN106500127A CN106500127A CN201710009415.9A CN201710009415A CN106500127A CN 106500127 A CN106500127 A CN 106500127A CN 201710009415 A CN201710009415 A CN 201710009415A CN 106500127 A CN106500127 A CN 106500127A
- Authority
- CN
- China
- Prior art keywords
- air preheater
- bypass
- air
- cold
- preheater
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
-
- 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
- F23L2900/00—Special arrangements for supplying or treating air or oxidant for combustion; Injecting inert gas, water or steam into the combustion chamber
- F23L2900/15043—Preheating combustion air by heat recovery means located in the chimney, e.g. for home heating devices
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Supply (AREA)
Abstract
The invention discloses a kind of bypass air preheater heat recovery system and method；The present invention arranges a set of bypass air preheater in general boiler back end ductwork air preheater part, constitute with existing air preheater and be arranged in parallel, according to the change of exhaust gas volumn and air preheater entrance flue gas temperature, exhaust gas volumn is adjusted by existing air preheater and the flue gas allocation proportion for bypassing air preheater, abundant recovery boiler smoke heat energy, heat loss is reduced, boiler efficiency is improved.The present invention so that fume afterheat is fully used, can reduce flue gas heat loss, improve the economy of boiler according to the method for operation of the change automatic regulating system of service condition.
Description
Technical field
The present invention relates to a kind of bypass air preheater heat recovery system and method, by station boiler air preheater
The flue gas waste heat recovery system on road and method.
Background technology
The energy is the lifeblood of national economy, is the necessary material basis of socio-economic development.In recent years, countries in the world are especially
It is developed country, all using improving the important goal of the utilization ratio of the energy, energy saving as its energy development strategy.State
Family proposes multinomial energy-saving and emission-reduction policy successively, encourages to supervise the energy-saving and emission-reduction of whole society's every profession and trade to work, and power industry is used as energy
Source important component part, carries out energy-saving significant.Station boiler flue gas loss is the major part of boiler losses, reduces
Exhaust gas temperature can significantly improve boiler efficiency, improve unit economy.
Therefore it is highly desirable to further reducing exhaust gas temperature, development of latent energy-saving potential improves unit economy.Drop at present
The measure of low exhaust gas temperature mainly has：1st, adjusted by boiler combustion and depth soot blowing increase boiler heating surface caloric receptivity,
Reduce exhaust gas temperature；2nd, low-level (stack-gas) economizer is set after empty (gas) pre- (heat) device, introduces condensate, absorb fume afterheat, reduce
Draw gas, reduce exhaust gas temperature.
Utilization to residual heat from boiler fume, existing many designs and practice both at home and abroad, using the type of flue gas heat-exchange unit
Heat in flue gas is replaced by heat exchanger and is used to other medium by formula.This flue gas heat-exchange unit is referred to as " low temperature province
The various titles such as coal device ", " low-pressure coal saver ", " gas cooler ", " cigarette water- to-water heat exchanger ", its essence is same or analogous,
Except that the position of flue gas heat-exchange unit arrangement is different with heat transferring medium.
(1) boiler tail is arranged in, using condensed water absorption fume afterheat.For example, certain boiler of power plant exhaust gas temperature domestic
Higher, in order to reduce exhaust gas temperature, the performance driving economy of unit is improved, low temperature has been installed additional in the outlet of boiler tail air preheater and saved coal
Device, using condensed water absorption fume afterheat, is shown in accompanying drawing 1.
(2) before being arranged in absorption tower, using condensed water absorption fume afterheat.German power plant Schwarze Pumpe power plant
2*800MW brown coal generating sets have installed gas cooler between electrostatic precipitator and fume desulfurizing tower additional, are inhaled using condensate
Receive fume afterheat.Certain power plant domestic also arranges cigarette water- to-water heat exchanger in same position, sees accompanying drawing 2.
Notification number discloses a kind of residual heat from boiler fume for the Chinese patent application of CN104896503A and utilizes system, including
The main line being made up of the boiler furnace, air preheater, cryogenic heat exchanger, feed-tank that are sequentially connected, wherein cryogenic heat exchanger with give
Vessel outlet forms loop, also includes air preheater air intake branch road, and the branch road one end connects on the air preheater, may be selected to sky
Pre- device air intake is heated or not heated；Also include reclaim motive heat distribution system, the system respectively with cryogenic heat exchanger, air preheater air intake
Branch road and feed-tank pipeline connection, can select the water heating to the heating of air preheater air intake or in feed-tank, reclaim heat distribution
System can be adjusted the condensing capacity after being heated of main line and each bye-pass, control to heat air preheater according to actual needs
The heat use ratio of air intake or condensate.The system is in the exhanst gas outlet position of existing air preheater, increases by two feedwater and adds
Hot device, a feed-water heater are arranged on after existing sky is expected before deduster, and another heater is arranged on existing sky
On the flue increased newly after pre- device, two-way flue gas converged before air-introduced machine, and fume afterheat is all absorbed by feedwater.But, return
The efficiency for receiving heat is low, and cannot improve the efficiency of boiler.
Chinese patent CN204880080U discloses a kind of residual heat from boiler fume recovery system, including economizer, the pump housing,
One heat exchanger, the second heat exchanger, heat supply network water system and condensate system, the economizer, the heat exchange of the First Heat Exchanger are situated between
Matter side and the pump housing are sequentially communicated to form first circulation loop, the economizer, the heat transferring medium of second heat exchanger
Side and the pump housing are sequentially communicated to form second circulation loop, the first water side of the First Heat Exchanger and the condensation water system
System connection forms the first heat-exchanging loop, and the second water side of second heat exchanger forms second with the hot net water system connectivity and changes
Hot loop.The utility model achieves the independent heat exchange of hot net water and condensate, effectively prevent water quality interference, it is ensured that
Main frame condensate is not contaminated.Meanwhile, using heat transferring medium and the indirect heat exchange mode of boiler smoke heat exchange so that condensate
With hot net water not with economizer directly contact, reduce economizer pouring, raw material cost of manufacture can be saved.The patent is
The heat absorbed using low-level (stack-gas) economizer feedwater after deduster, a part of heat-setting water, part heating heat supply network hot water,
Reduce flue-gas temperature using the heat absorption of heat supply network hot water.
At present, station boiler reduces method 3 weak points of presence of exhaust gas temperature：1st, blown by firing optimization and depth
Ash increase boiler heating surface heat absorption, less to reducing exhaust gas temperature amplitude, and persistently cannot implement；2nd, by condensate heat absorption drop
Low exhaust gas temperature, fume afterheat enter heat regenerative system low pressure condensate water part, squeeze extracted steam from turbine, and economy is not high；3rd, difficult
To adapt to the requirement for persistently reducing exhaust gas temperature when the factors such as raw coal sulphur content, moisture and fouling of heating surface change；4th, heat is reclaimed
The efficiency of amount is low, and cannot additionally improve the efficiency of boiler.
Content of the invention
The technical problem to be solved in the present invention is to provide a kind of heat recovery system based on bypass air preheater and method, can
According to the method for operation of the change Automatic Optimal regulating system of service condition, so that residual heat from boiler fume is fully used, subtract
Little flue gas loss, realizes that boiler economics are maximized.
For reaching above-mentioned purpose, technical scheme is as follows：
The bypass air preheater heat recovery system of the present invention, including：
One flue collector；
The main air preheater being arranged on the flue collector, the main air preheater respectively with a cold air channel, cold secondary air duct
Be connected, the flue gas of the flue collector is entered by the main air preheater cold First air respectively with a cold air channel, described
The cold Secondary Air of cold secondary air duct carries out heat exchange, and the flue gas after so cooling down is discharged to boiler back end ductwork, and described cold one
Heat primary air, hot Secondary Air is respectively become after secondary wind, the cold Secondary Air are heated is discharged to burning in boiler；
The one bypass exhaust gases passes separated from the flue collector, the part of smoke distributed from the flue collector enter institute
State bypass flue；
The bypass air preheater being arranged on the bypass exhaust gases passes, the bypass air preheater are connected with cold secondary air duct,
So, the flue gas for entering the bypass air preheater carries out heat exchange with the cold wind from the cold secondary air duct, after so cooling down
The flue gas be discharged to boiler back end ductwork, and respectively become hot Secondary Air after the cold Secondary Air is heated and be discharged to boiler
In Secondary Air main pipe, for burning in stove.
The bypass air preheater heat recovery system, is provided with the bypass exhaust gases passes before flue gas enters bypass air preheater
One bypass smoke regulating valve；
Enter in the cold Secondary Air and arrange on the passage of bypass air preheater the cold secondary air adjustor valve of a bypass.
The bypass heat time wind stop valve is set on the bypass second heat air channel of the bypass air preheater air outlet slit.
The second smoke temperature measurement element is set on flue before the main air preheater entrance.
The main air preheater outlet rear pass arranged the 9th smoke temperature measurement element before flue gas mixing point.
Described 21st smoke temperature measurement element is set in bypass air preheater exhanst gas outlet flue.
In main air preheater exhaust pass mixing point rear pass, the 23rd smoke temperature measurement element is set.
4th smoke temperature measurement element is set on a cold air channel.
7th smoke temperature measurement element is set on the cold secondary air duct.
In the heat primary air road, the 14th smoke temperature measurement element is set.
In the main hot secondary air duct, 17 smoke temperature measurement elements are set.
In the hot secondary air duct of the bypass, the 20th smoke temperature measurement element is set.
The air of bypass air preheater not only can be drawn from cold secondary air duct, it is also possible to draw from a cold air channel, but only
Can select first, not compatible.
Present invention also offers a kind of bypass air preheater heat recovery method, specifically includes following steps：
High-temperature flue gas before making the main air preheater entrance of flue collector in flue flow through main air preheater, and with a cold air channel,
Cold secondary air duct flows through the air of the main air preheater and is exchanged heat；
Air preheater is bypassed with the main air preheater in parallel, the high-temperature flue gas in flue before the bypass air preheater entrance
Bypass air preheater is flowed through, and the air heat-exchange of the bypass air preheater is flowed through with the branch all the way of the cold Secondary Air；
After the main hot Secondary Air for flowing through the main air preheater and the hot Secondary Air mixing of the bypass for flowing through the bypass air preheater
Boiler secondary air main pipe is entered, for burning in stove；
The flue gas for flowing through the main air preheater exports rear pass through the main air preheater and flows through the bypass air preheater
Flue gas enters boiler back end ductwork after the bypass air preheater outlet rear pass mixing.
When the measurement temperature in the main air preheater exit is higher than the main air preheater outlet temperature setting value, big side is opened
Road smoke regulating valve flows through the smoke increase of the bypass air preheater；When the measurement temperature in the main air preheater exit is less than
During the main air preheater outlet temperature setting value, turn down bypass smoke regulating valve flow through described bypass air preheater smoke subtract
Little.
If the measurement temperature in the main air preheater exit is higher than the measurement temperature in the bypass air preheater exit,
Turn down cold secondary air adjustor valve and reduce the cold Secondary Air air quantity for entering the bypass air preheater；Or, if the main air preheater goes out
Measurement temperature of the measurement temperature at mouthful less than the bypass air preheater exit, then open cold greatly secondary air adjustor valve increase and enter
The cold Secondary Air air quantity of the bypass air preheater.
When the cold secondary air flow of bypass of the bypass air preheater being entered more than setting value, then make the bypass air preheater
The air channel opening of described hot Secondary Air keep full-gear；Or, when enter described bypass air preheater bypass described cold
When secondary air flow is less than setting value, then remain off the air channel opening of the described hot Secondary Air of the bypass air preheater.
The present invention is another bypass air preheater in the parallel connection of existing air preheater, from fan outlet draws low-temperature cold wind,
High-temperature flue gas are drawn at flue gas from before air preheater, and low-temperature cold wind and high-temperature flue gas are carried out in bypass air preheater in parallel
Heat exchange, increases the heat exchange area in fume side, reduces exhaust gas temperature.And prior art is mostly to absorb cigarette using feed-water heater
Gas waste heat, and the present invention is one to bypass air preheater in parallel, absorbs fume afterheat, diverse UTILIZATION OF VESIDUAL HEAT IN using cold wind
Mode and system architecture, have reached following significant technique effect：
(1) fume afterheat is absorbed using cold wind, waste heat is fully entered
More than 90%, far above the pre- heat utilization of general feed-water heater.
(2) cold wind can select First air or Secondary Air, if the dry scarce capacity of dried bean noodles processed, can select First air, otherwise, select
The characteristics of Secondary Air, applicable boiler difference.
(3) can put into operation bypass air preheater in unit high load capacity, and bypass air preheater of stopping transport in underload, it is suitable for working as
The requirement of front unit significantly peak regulation.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 schematically shows an example of prior art；
Fig. 2 schematically shows another example of prior art；
Fig. 3 schematically shows the structure of the preferred embodiment of the bypass air preheater heat recovery system of the present invention.
Specific embodiment
In order that technological means, creation characteristic, reached purpose and effect that the present invention is realized are easy to understand, tie below
Conjunction is specifically illustrating, and the present invention is expanded on further.
As shown in Figure 3, the bypass air preheater heat recovery system that the present invention is provided includes：Main air preheater 3, bypass are empty pre-
Device 10, air duct and exhaust gases passes.The air duct includes the air channel 5 of cold First air, the air channel 6 of cold Secondary Air, heat one
The air channel 15 of secondary wind, the air channel 15 of main hot Secondary Air, the air channel 19 for bypassing hot Secondary Air.From the air channel 5 of cold First air, cold secondary
The air channel 6 of wind enters the wind of main air preheater 3 and is referred to as cold First air, cold Secondary Air；From main air preheater 3 or bypass air preheater 10 out
Enter the air channel 15 of heat primary air, the air channel 16 of main hot Secondary Air, bypass hot Secondary Air air channel 19 wind be referred to as heat primary air,
Main hot Secondary Air, the hot Secondary Air of bypass.
Before exhaust gases passes include flue 1 before main air preheater entrance, main air preheater outlet rear pass 11, bypass air preheater entrance
Flue 12, bypass air preheater outlet rear pass 22.
Air duct is connected with main air preheater 3 or bypass air preheater 10 with exhaust gases passes.
Before main air preheater entrance, flue 1 is connected to main air preheater 3, exports rear pass 11 with main air preheater and connects.Cold once
Air channel 5, cold secondary road 6, heat primary air road 15, main hot secondary air duct (16) are connected with main air preheater (3), so cold First air
Road 5, the cold First air in cold secondary road 6 and cold Secondary Air and high-temperature flue gas exchange heat (heat exchange) in main air preheater 3.
Before air preheater entrance, flue (bypass flue) 12 is connected to bypass air preheater 10, with bypass air preheater outlet rear pass
22 connections, cold secondary air duct 6, the hot secondary road 18 of bypass are connected with bypass air preheater 10, so bypass the bypass in hot secondary road 18
Secondary Air is exchanged heat in bypass air preheater 10 with bypass flue gas.
The bypass air preheater heat recovery system that the present invention is provided also includes bypassing cold secondary air adjustor valve 8, bypass heat two
Secondary wind stop valve 18, bypass smoke regulating valve 13.
Bypass cold secondary air adjustor valve 8 to be arranged on the cold secondary air channel of cold Secondary Air entrance bypass air preheater 10；Other
The hot Secondary Air stop valve 18 in road is arranged on hot 19 passage of Secondary Air of bypass of bypass 10 air outlet slit of air preheater；Bypass flue gas is adjusted
Section valve 13 is arranged on the bypass exhaust gases passes 12 before flue gas enters bypass air preheater 10.
Main hot secondary air duct 16 is connected by triplet type air duct joint with hot Secondary Air 19 is bypassed, cigarette after main air preheater outlet
Road 11 is connected by triplet type flue adapter with bypass air preheater outlet rear pass 22.
Second smoke temperature measurement element 2 is set on flue 1 before the entrance of main air preheater 3, and main air preheater 3 exports rear pass
11 before flue gas mixing point arrange the 9th smoke temperature measurement element 9, bypass 10 exhanst gas outlet flue of air preheater and with main sky
Pre- device exhaust pass mixing point rear pass is respectively provided with smoke temperature measurement element 21,23, a cold air channel 5, cold secondary air duct
6th, heat primary air road 15, main hot secondary air duct 16, bypass hot secondary air duct 19 be respectively provided with the 4th smoke temperature measurement element 4,
7th smoke temperature measurement element 7, the 14th smoke temperature measurement element 14, the 17th smoke temperature measurement element 17, second
Ten smoke temperature measurement elements 20.
A cold air channel 5, cold secondary air duct 6 are respectively from primary air fan and pressure fan, a cold air channel 5 and cold Secondary Air
The flow in road 6 depends on boiler load and service condition, and heat primary air road 15 is connected with heat primary air road main pipe, goes to powder system processed
System, main hot secondary air duct 16, the hot secondary air duct 19 of bypass are connected with hot Secondary Air main pipe after the mixing of air channel three-way piece, and which is defeated
The wind for going out goes to secondary air box.
The method of work of present system includes：
High-temperature flue gas before main air preheater entrance in flue 1 flow through main air preheater 3, at the same with a cold air channel 5, cold secondary
Air channel 6 flows through the cold First air of main air preheater 3, the heat exchange of cold Secondary Air；
High-temperature flue gas before bypass 10 entrance of air preheater in flue 12 flow through bypass air preheater 10, with cold secondary air duct 6
Branch flows through the cold Secondary Air heat exchange of bypass air preheater 10 all the way；
The main hot secondary air duct 16 for flowing through main air preheater 3 and the bypass hot secondary air duct (19) for flowing through bypass air preheater 10 are mixed
Boiler secondary air main pipe is entered after conjunction, for burning in stove；
The flue gas for flowing through main air preheater 3 exports rear pass 11 and the flue gas warp for flowing through bypass air preheater 10 through main air preheater 3
Bypass air preheater outlet rear pass 22 enters boiler back end ductwork after mixing；And
Second smoke temperature measurement element 2 is set on flue 1 before 3 entrance of main air preheater, and main air preheater exports rear pass 11
9th smoke temperature measurement element 9 was set before flue gas mixing point, bypass 10 exhanst gas outlet flue of air preheater and empty pre- with main
3 exhaust pass mixing point rear pass of device is respectively provided with the 21st smoke temperature measurement element 21, the 23rd measuring cell 23.
A cold air channel 5, cold secondary air duct 6, heat primary air road 15, main hot secondary air duct 16, the hot secondary air duct 19 of bypass are respectively provided with
4th smoke temperature measurement element 4, the 7th measuring cell 7, the 14th measuring cell 14, the 17th measuring cell 17,20 are surveyed
Amount element 20.
Bypass smoke regulating valve 13 controls which according to the measurement temperature of unit load, the 9th smoke temperature measurement element 9 and opens
Degree：When the measurement temperature of the 9th smoke temperature measurement element 9 is higher than the outlet temperature setting value of main air preheater 3, then bypass flue gas
13 aperture of regulating valve increases；Or, the temperature of the measurement of the 9th smoke temperature measurement element 9 is set less than 3 outlet temperature of main air preheater
Definite value, then reduce 13 aperture of bypass smoke regulating valve.
Bypass cold secondary air adjustor valve 8 bypass smoke regulating valve 13 open after synchronously open, and according to main air preheater 3 after
The 9th smoke temperature measurement element 9, bypass air preheater 10 after 21 measurement temperature deviation of smoke temperature measurement element control which
Aperture：If the measurement temperature of the 9th smoke temperature measurement element 9 after main air preheater 3 is more than the 20th after bypass air preheater 10
The measurement temperature of one smoke temperature measurement element 21, then bypass the reduction of 8 aperture of cold secondary air adjustor valve；Or, if main air preheater 3
9 measurement temperature of the 9th smoke temperature measurement element afterwards is less than the 21st smoke temperature measurement element after bypass air preheater 3
21 measurement temperature, then will bypass the aperture increase of cold secondary air adjustor valve 8.
Bypass hot Secondary Air stop valve 18 and its aperture is controlled according to the aperture for bypassing cold secondary air adjustor valve 8：Cold when bypassing
The aperture of secondary air adjustor valve 8 then bypasses hot Secondary Air stop valve 18 and keeps full-gear more than setting value；Or, work as bypass
The aperture of cold secondary air adjustor valve 8 then bypasses hot Secondary Air stop valve 18 and is closed less than setting value.
When unit occurs RB or MFT, the aperture for bypassing cold secondary air adjustor valve 8 and bypass smoke regulating valve 13 synchronously subtracts
Little up to Close All, closing velocity depends on the speed of RB or MFT, after Close All, bypasses hot Secondary Air stop valve
18 are accordingly turned off.
In addition, the present invention can quote the amount of sulfur contenting in smoke of monitor in real time or flue gas acid dew point measured value, revise automatically empty pre-
The initial set values such as 3 entering air temperature of device exit gas temperature and main air preheater, to strengthen unit to using coal and equipment
The adaptability of operation conditions.When amount of sulfur contenting in smoke or flue gas acid dew point measured value increase than initial set value, the deviation is passed through
Control computing exports each correction value, to increase each of 3 entering air temperature of 3 exit gas temperature of air preheater and main air preheater respectively
Setting value, vice versa.
By above description, it can be seen that the present invention is another bypass air preheater in the parallel connection of existing air preheater, from
Low-temperature cold wind is drawn at fan outlet, high-temperature flue gas is drawn at the flue gas from before air preheater, by low-temperature cold wind and high-temperature flue gas
Exchanged heat in bypass air preheater in parallel, increased the heat exchange area in fume side, reduced exhaust gas temperature.And prior art is big
All be fume afterheat to be absorbed using feed-water heater, and the present invention is one to bypass air preheater in parallel, absorbs cigarette using cold wind
Gas waste heat, is diverse UTILIZATION OF VESIDUAL HEAT IN mode and system architecture, so as to reach following significant technique effect：
(1) fume afterheat is absorbed using cold wind, waste heat is fully entered
More than 90%, far above the pre- heat utilization of general feed-water heater.
(2) cold wind can select First air or Secondary Air, if the dry scarce capacity of dried bean noodles processed, can select First air, otherwise, select
The characteristics of Secondary Air, applicable boiler difference.
(3) can put into operation bypass air preheater in unit high load capacity, and bypass air preheater of stopping transport in underload, it is suitable for working as
The requirement of the big load peak regulation of front unit.
(4) as suitable exhaust gas temperature is relevant with coal sulfur content, moisture, therefore, can be adjusted according to the change of coal
The operational percentage of bypass air preheater, adjusts suitable exhaust gas temperature, adapts to the requirement of coal.
(5) reduce exhaust gas temperature during high load capacity, can not only improve boiler efficiency, can also reduce air-introduced machine power consumption, with aobvious
The energy-saving effect of work.
The general principle and principal character and advantages of the present invention of the present invention has been shown and described above.The technology of the industry
Personnel it should be appreciated that the present invention is not restricted to the described embodiments, simply explanation described in above-described embodiment and specification this
The principle of invention, without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, these changes
Change and improvement is both fallen within scope of the claimed invention.The claimed scope of the invention by appending claims and its
Equivalent thereof.
Claims (18)
1. one kind bypasses air preheater heat recovery system, it is characterised in that include：
One flue collector (1)；
The main air preheater (3) being arranged on the flue collector (1), main air preheater (3) respectively with a cold air channel (5), cold
Secondary air duct (6) be connected, enter flue collector (1) flue gas by main air preheater (3) respectively with the cold First air
The cold First air in road (5), the cold Secondary Air of cold secondary air duct (6) carry out heat exchange, and the flue gas after so cooling down is discharged to
Boiler back end ductwork, and respectively become heat primary air, hot Secondary Air after the cold First air, the cold Secondary Air are heated and discharge
The burning in boiler；
The one bypass exhaust gases passes (12) separated from the flue collector (1), from the part of smoke that the flue collector (1) is distributed
Enter the bypass flue；And
The bypass air preheater (10) being arranged on bypass exhaust gases passes (12), bypass air preheater (10) and cold Secondary Air
Road (6) arbitrary be connected, so, enter described bypass air preheater (10) flue gas with from the cold of cold secondary air duct (6)
Wind carries out heat exchange, and the flue gas after so cooling down is discharged to boiler back end ductwork, and divides after the cold Secondary Air is heated
Do not become hot Secondary Air and be discharged to boiler secondary air main pipe, for burning in stove.
2. as claimed in claim 1 bypass air preheater heat recovery system, it is characterised in that the bypass air preheater heat return
Receipts system, is provided with a bypass smoke regulating valve on the bypass exhaust gases passes (12) before flue gas enters bypass air preheater (10)
(13).
3. bypass air preheater heat recovery system as claimed in claim 1, it is characterised in that enter in the cold Secondary Air other
One is arranged on the passage of road air preheater (10) bypasses cold secondary air adjustor valve (8).
4. as claimed in claim 1 bypass air preheater heat recovery system, it is characterised in that bypass air preheater (10) air
The bypass hot Secondary Air stop valve (18) is set on bypass secondary hot-air (19) passage of outlet.
5. as claimed in claim 1 bypass air preheater heat recovery system, it is characterised in that before the entrance of main air preheater (3)
Flue collector (1) is upper to arrange the second smoke temperature measurement element (2).
6. as claimed in claim 1 bypass air preheater heat recovery system, it is characterised in that after the outlet of main air preheater (3)
Flue (11) arranged the 9th smoke temperature measurement element (9) before flue gas mixing point.
7. as claimed in claim 1 bypass air preheater heat recovery system, it is characterised in that bypass air preheater (10) cigarette
Gas exhaust pass arranges the 21st smoke temperature measurement element (21).
8. as claimed in claim 1 bypass air preheater heat recovery system, it is characterised in that in the outlet of main air preheater (3)
Flue mixing point rear pass arranges the 23rd smoke temperature measurement element (23).
9. as claimed in claim 1 bypass air preheater heat recovery system, it is characterised in that set on a cold air channel (5)
Put the 4th smoke temperature measurement element (4).
10. as claimed in claim 1 bypass air preheater heat recovery system, it is characterised in that set on cold secondary air duct (6)
Put the 7th smoke temperature measurement element (7).
11. bypass air preheater heat recovery systems as claimed in claim 1, it is characterised in that set in heat primary air road (15)
Put the 14th smoke temperature measurement element (14).
12. bypass air preheater heat recovery systems as claimed in claim 1, it is characterised in that in main hot secondary air duct (16)
17 smoke temperature measurement elements (17) are set.
13. bypass air preheater heat recovery systems as claimed in claim 1, it is characterised in that bypassing hot secondary air channel
(19) the 20th smoke temperature measurement element (20) is set.
14. bypass air preheater heat recovery systems as claimed in claim 1, it is characterised in that the sky of bypass air preheater (10)
Gas not only can be drawn from cold secondary air duct (6), it is also possible to draw from a cold air channel (5), but can only select first, can not be simultaneous
Hold.
A kind of 15. bypass air preheater heat recovery methods, it is characterised in that：
High-temperature flue gas before making the entrance of main air preheater (3) in flue collector (1) flow through main air preheater (3), and with a cold air channel
(5), cold secondary air duct (6) flow through the cold First air of main air preheater (3), cold Secondary Air and are exchanged heat；
High-temperature flue gas before bypass air preheater (10) entrance in flue (12) flow through bypass air preheater (10), with the cold Secondary Air
(6) branch all the way flows through the air heat-exchange of bypass air preheater (10)；
The main hot Secondary Air for flowing through the main hot Secondary Air (16) of main air preheater (3) and the bypass heat two for flowing through bypass air preheater (10)
Boiler secondary air main pipe is entered after the hot Secondary Air mixing of the bypass of secondary wind (19), for burning in stove；
The flue gas for flowing through main air preheater (3) exports rear pass (11) and the flue gas warp for flowing through bypass air preheater (10) through main air preheater
Boiler back end ductwork is entered after bypass air preheater outlet rear pass (22) mixing.
16. bypass air preheater heat recovery methods as claimed in claim 15, it is characterised in that when main air preheater (3) is exported
The measurement temperature at place is higher than main air preheater (3) outlet temperature setting value, then open big bypass smoke regulating valve and flow through bypass sky in advance
The smoke increase of device (10)；When the measurement temperature in main air preheater (3) exit is less than main air preheater (3) outlet temperature setting value
When, then turn down the smoke reduction that bypass smoke regulating valve flows through bypass air preheater (10).
17. bypass air preheater heat recovery methods as claimed in claim 15, it is characterised in that when main air preheater (3) is exported
When the measurement temperature at place is higher than the measurement temperature in bypass air preheater exit, then turns down cold secondary air adjustor valve and reduce entrance bypass
The cold Secondary Air air quantity of air preheater (10)；When the measurement temperature in main air preheater (3) exit is less than bypass air preheater exit
During measurement temperature, then open the cold Secondary Air air quantity that cold greatly secondary air adjustor valve increase enters bypass air preheater (10).
18. bypass air preheater heat recovery methods as claimed in claim 15, it is characterised in that bypass air preheater when entering
(10), when the cold secondary air flow of bypass is more than setting value, the air channel opening for bypassing the hot Secondary Air of air preheater (10) keeps standard-sized sheet
State；When the cold secondary air flow of bypass of bypass air preheater (10) being entered less than setting value, then bypass the heat of air preheater (10)
The air channel opening of Secondary Air is remained off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710009415.9A CN106500127B (en) | 2017-01-06 | 2017-01-06 | Bypass air preheater heat recovery system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710009415.9A CN106500127B (en) | 2017-01-06 | 2017-01-06 | Bypass air preheater heat recovery system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106500127A true CN106500127A (en) | 2017-03-15 |
| CN106500127B CN106500127B (en) | 2021-09-10 |
Family
ID=58345086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710009415.9A Active CN106500127B (en) | 2017-01-06 | 2017-01-06 | Bypass air preheater heat recovery system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106500127B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107062194A (en) * | 2017-04-19 | 2017-08-18 | 大唐贵州发耳发电有限公司 | A kind of thermal power plant flue gas waste heat recovery apparatus |
| CN109404958A (en) * | 2018-11-12 | 2019-03-01 | 南京博沃科技发展有限公司 | A kind of energy efficiency anti-blocking method and system based on air preheater bypass flue |
| CN110594777A (en) * | 2019-09-26 | 2019-12-20 | 中国电建集团河南工程有限公司 | Steam supply system of air heater of boiler air preheater |
| CN110793057A (en) * | 2019-10-18 | 2020-02-14 | 华电电力科学研究院有限公司 | System and method for preventing air preheater of coal-fired power plant from being blocked |
| CN114110638A (en) * | 2021-11-26 | 2022-03-01 | 西安热工研究院有限公司 | Automatic regulating system and method for efficient flue gas waste heat utilization of air preheater bypass |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08121703A (en) * | 1994-10-24 | 1996-05-17 | Mitsubishi Heavy Ind Ltd | Waste heat recovery apparatus |
| EP0872690A2 (en) * | 1997-04-15 | 1998-10-21 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Heat recovery apparatus and methods of use |
| WO2012042101A1 (en) * | 2010-09-30 | 2012-04-05 | Åf-Consult Oy | Method for recovering heat from flue gas and steam power plant |
| CN102607011A (en) * | 2012-03-22 | 2012-07-25 | 济南达能动力技术有限责任公司 | Multi-stage utilization system for transferring exhaust afterheat energy of power station boiler |
| CN103104907A (en) * | 2013-01-31 | 2013-05-15 | 华北电力大学 | Heating structure and heating method of boiler based on partitioned flue and multistage air preheating |
| WO2013121088A2 (en) * | 2012-02-15 | 2013-08-22 | Foster Wheeler Energia Oy | Circulating fluidized bed boiler with an air preheater system |
| CN104501198A (en) * | 2014-11-28 | 2015-04-08 | 陈翔 | Heat-conducting oil boiler waste heat power generation system |
| CN204460272U (en) * | 2015-01-21 | 2015-07-08 | 东方电气集团东方锅炉股份有限公司 | A kind of therrmodynamic system of mixed-arrangement |
| CN204830000U (en) * | 2015-07-22 | 2015-12-02 | 成信绿集成股份有限公司 | System for use spiral finned heat exchanger to promote air preheater safety |
| CN205191616U (en) * | 2015-12-02 | 2016-04-27 | 北京慧峰仁和科技股份有限公司 | Novel clean flue gas heating device |
| CN106090880A (en) * | 2016-07-21 | 2016-11-09 | 内蒙古京能锡林发电有限公司 | A kind of machine stove set heat circulation afterheat recycling system |
| CN205717145U (en) * | 2016-04-13 | 2016-11-23 | 华北电力大学 | A kind of comprehensive residual heat using device of First air warm depth optimization |
| CN206430185U (en) * | 2017-01-06 | 2017-08-22 | 上海明华电力技术工程有限公司 | One kind bypass air preheater heat recovery system |
-
2017
- 2017-01-06 CN CN201710009415.9A patent/CN106500127B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08121703A (en) * | 1994-10-24 | 1996-05-17 | Mitsubishi Heavy Ind Ltd | Waste heat recovery apparatus |
| EP0872690A2 (en) * | 1997-04-15 | 1998-10-21 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Heat recovery apparatus and methods of use |
| WO2012042101A1 (en) * | 2010-09-30 | 2012-04-05 | Åf-Consult Oy | Method for recovering heat from flue gas and steam power plant |
| WO2013121088A2 (en) * | 2012-02-15 | 2013-08-22 | Foster Wheeler Energia Oy | Circulating fluidized bed boiler with an air preheater system |
| CN102607011A (en) * | 2012-03-22 | 2012-07-25 | 济南达能动力技术有限责任公司 | Multi-stage utilization system for transferring exhaust afterheat energy of power station boiler |
| CN103104907A (en) * | 2013-01-31 | 2013-05-15 | 华北电力大学 | Heating structure and heating method of boiler based on partitioned flue and multistage air preheating |
| CN104501198A (en) * | 2014-11-28 | 2015-04-08 | 陈翔 | Heat-conducting oil boiler waste heat power generation system |
| CN204460272U (en) * | 2015-01-21 | 2015-07-08 | 东方电气集团东方锅炉股份有限公司 | A kind of therrmodynamic system of mixed-arrangement |
| CN204830000U (en) * | 2015-07-22 | 2015-12-02 | 成信绿集成股份有限公司 | System for use spiral finned heat exchanger to promote air preheater safety |
| CN205191616U (en) * | 2015-12-02 | 2016-04-27 | 北京慧峰仁和科技股份有限公司 | Novel clean flue gas heating device |
| CN205717145U (en) * | 2016-04-13 | 2016-11-23 | 华北电力大学 | A kind of comprehensive residual heat using device of First air warm depth optimization |
| CN106090880A (en) * | 2016-07-21 | 2016-11-09 | 内蒙古京能锡林发电有限公司 | A kind of machine stove set heat circulation afterheat recycling system |
| CN206430185U (en) * | 2017-01-06 | 2017-08-22 | 上海明华电力技术工程有限公司 | One kind bypass air preheater heat recovery system |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107062194A (en) * | 2017-04-19 | 2017-08-18 | 大唐贵州发耳发电有限公司 | A kind of thermal power plant flue gas waste heat recovery apparatus |
| CN109404958A (en) * | 2018-11-12 | 2019-03-01 | 南京博沃科技发展有限公司 | A kind of energy efficiency anti-blocking method and system based on air preheater bypass flue |
| CN109404958B (en) * | 2018-11-12 | 2024-02-02 | 南京博沃科技发展有限公司 | Energy-saving synergistic anti-blocking method and system based on bypass flue of air preheater |
| CN110594777A (en) * | 2019-09-26 | 2019-12-20 | 中国电建集团河南工程有限公司 | Steam supply system of air heater of boiler air preheater |
| CN110594777B (en) * | 2019-09-26 | 2024-04-09 | 中国电建集团河南工程有限公司 | Steam supply system of air heater of boiler air preheater |
| CN110793057A (en) * | 2019-10-18 | 2020-02-14 | 华电电力科学研究院有限公司 | System and method for preventing air preheater of coal-fired power plant from being blocked |
| CN110793057B (en) * | 2019-10-18 | 2024-01-30 | 华电电力科学研究院有限公司 | System and method for preventing blockage of air preheater of coal-fired power plant |
| CN114110638A (en) * | 2021-11-26 | 2022-03-01 | 西安热工研究院有限公司 | Automatic regulating system and method for efficient flue gas waste heat utilization of air preheater bypass |
| CN114110638B (en) * | 2021-11-26 | 2024-01-19 | 西安热工研究院有限公司 | Automatic regulating system and method for efficient flue gas waste heat utilization of bypass of air preheater |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106500127B (en) | 2021-09-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106090880B (en) | A kind of machine stove set heat circulation afterheat recycling system | |
| CN106500127A (en) | A kind of bypass air preheater heat recovery system and method | |
| CN204693472U (en) | A kind of air preheat and smoke waste heat utilization system | |
| CN105180146B (en) | A kind of cogeneration power plant fume afterheat is multistage to reclaim utilization system | |
| CN208139316U (en) | A kind of coal unit fume afterheat utilizes and environment friendly system | |
| CN105889897B (en) | A kind of thermal power plant residual heat integrative recycling system and method | |
| CN107366897A (en) | A kind of Pollutant in Coal Burning Boiler emission reduction optimization collaboration fume afterheat deep exploitation system | |
| CN105135468B (en) | Smoke waste heat utilization system | |
| CN106765044A (en) | The system that flue gas in power station boiler multichannel bypasses waste heat classified utilization | |
| CN106402838A (en) | Tail flue gas waste heat utilizing system of utility boiler based on hot blast recycling | |
| CN206430185U (en) | One kind bypass air preheater heat recovery system | |
| CN204987074U (en) | Synthesize backheat and waste heat utilization's adjustable boiler preheating of air system | |
| CN107202318A (en) | A kind of heat of smoke discharged from boiler of power station deep exploitation and water reclamation system | |
| CN206682921U (en) | A kind of station boiler multi-element heterogeneous afterheat utilizing system | |
| CN103115377B (en) | A kind of sub-control phase transformation air preheating system and air preheat method | |
| CN105091020B (en) | Adjustable boiler air preheating system and method integrating heat regeneration and waste heat utilization | |
| CN209588020U (en) | Station boiler cold air heating and smoke waste heat comprehensive utilization system | |
| CN111425878A (en) | Boiler tail flue gas waste heat degree of depth cascade utilization system | |
| CN106765245A (en) | A kind of smoke waste heat utilization system | |
| CN204756887U (en) | High -efficient hot media water system of circulating fluidized bed boiler | |
| CN104676250B (en) | Steam exhaust recycling and main pipe network dual-combination steam regulating system | |
| CN208253553U (en) | A kind of system improving the wide load operation thermal efficiency of coal unit | |
| CN206330139U (en) | A kind of smoke waste heat utilization system | |
| CN205807384U (en) | A kind of MGGH condensation water heating system | |
| CN212511229U (en) | Boiler tail flue gas waste heat degree of depth cascade utilization system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 200437 room 801, building 9, 171 Handan Road, Hongkou District, Shanghai Applicant after: Shanghai Minghua Power Technology Co.,Ltd. Address before: 200437 room 801, building 9, 171 Handan Road, Hongkou District, Shanghai Applicant before: SHANGHAI MINGHUA ELECTRIC POWER TECHNOLOGY AND ENGINEERING Co.,Ltd. |
|
| CB02 | Change of applicant information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |